[PATCH v1 00/47] mtrr/x86/drivers: bury MTRR

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Revision v1 of 2 in this series.

110 messages, 10 authors, 2015-04-30 · page 1 of 2 · open the first message on its own page

[PATCH v1 00/47] mtrr/x86/drivers: bury MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:20:57

From: "Luis R. Rodriguez" <redacted>

When a system has PAT support enabled you don't need to be
using MTRRs. Andy had added arch_phys_wc_add() long ago to
help with this but not all drivers were converted over. We
have to take care to only convert drivers where we know that
the proper ioremap_wc() API has been used. Doing this requires
a bit of work on verifying the driver split out the ioremap'd
areas -- and if not doing that ourselves. Verifying a driver
uses the same areas can be hard but with a bit of love Coccinelle
can help with that.

We're motivated to change drivers for a few reasons:

1) Take advantage of PAT when available

2) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

3) Bury MTRR code away from drivers as it is architecture specific

While working on the conversion I noticed a few things.

a) Run time disabling of MTRR

Some systems can technically have both PAT and MTRR enabled
and even if they support it, a system may end up not enabling MTRR.
There are a few reasons why this can happen but the code right now
doesn't address this well. This leads to another point: PAT code
right now is not a first class citizen on x86 -- pat_init() depends
on MTRR code so we can't actually enable PAT without building MTRR.
Doing this requires quite a bit more work so let this serve as
a starting point for conversation if we want to address that.

b) Driver work and required ioremap split

In order to take advantage of PAT device drivers that were using
MTRR must make sure that the area that was using MTRR is ioremap'd
separately. Fortunately a lot of drivers already do this, but there's
quite a bit of drivers that require some love to get that happen.
This leaves us needing to expose an last resort API to annotate this
and also avoid a regression on performance for systems that may have
PAT but can't yet move away from using MTRR. To find the drivers that
need love check out __arch_phys_wc_add(). For a good example driver
where the work was done refer to the atyfb driver fixes.

c) Missing APIs for write-combining

There's a few API calls missing to take advantage of write-combining,
this series add those.

d) Further framebuffer driver MTRR usage simplication

We can simplify MTRR usage by having the framebuffer core
add the MTRR by passing a flag when register_framebuffer()
is called, this could for instance be done on very few drivers
where the smem_len and smem_start are both used for the ioremap_wc()
and also for the arch_phys_wc_add(). Coccinelle can be easily used
to do a transformation here. I didn't do that here given that it
does not work for all device drivers *and* DRM drivers already
have something similar. Lastly this technically could also be done
on some other generic helper --- but figured its best we review that
here. One reason to *not* do this is that tons of framebuffer drivers
have mtrr options exposed -- we'd need to generalize those and provide
a port ... or deal with the fact that we are going to remove all that.

Luis R. Rodriguez (47):
  x86: mtrr: annotate mtrr_type_lookup() is only implemented on
    generic_mtrr_ops
  x86: mtrr: generalize run time disabling of MTRR
  devres: add devm_ioremap_wc()
  pci: add pci_ioremap_wc_bar()
  pci: add pci_iomap_wc() variants
  mtrr: add __arch_phys_wc_add()
  video: fbdev: atyfb: move framebuffer length fudging to helper
  video: fbdev: atyfb: clarify ioremap() base and length used
  vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around
  video: fbdev: atyfb: use arch_phys_wc_add() and ioremap_wc()
  IB/qib: add acounting for MTRR
  IB/qib: use arch_phys_wc_add()
  IB/ipath: add counting for MTRR
  IB/ipath: use __arch_phys_wc_add()
  [media] media: ivtv: use __arch_phys_wc_add()
  fusion: use __arch_phys_wc_add()
  video: fbdev: vesafb: only support MTRR_TYPE_WRCOMB
  vidoe: fbdev: vesafb: add missing mtrr_del() for added MTRR
  video: fbdev: vesafb: use arch_phys_wc_add()
  mtrr: avoid ifdef'ery with phys_wc_to_mtrr_index()
  ethernet: myri10ge: use arch_phys_wc_add()
  staging: sm750fb: use arch_phys_wc_add() and ioremap_wc()
  staging: xgifb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: arkfb: use arch_phys_wc_add() and pci_iomap_wc()
  video: fbdev: radeonfb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: gbefb: add missing mtrr_del() calls
  video: fbdev: gbefb: use arch_phys_wc_add() and devm_ioremap_wc()
  video: fbdev: intelfb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: matrox: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: neofb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: s3fb: use arch_phys_wc_add() and pci_iomap_wc()
  video: fbdev: nvidia: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: savagefb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: sisfb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: aty: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: i810: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: i740fb: use arch_phys_wc_add() and pci_ioremap_wc_bar()
  video: fbdev: kyrofb: use arch_phys_wc_add() and pci_ioremap_wc_bar()
  video: fbdev: pm2fb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: pm3fb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: rivafb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: tdfxfb: use arch_phys_wc_add() and ioremap_wc()
  video: fbdev: vt8623fb: use arch_phys_wc_add() and pci_iomap_wc()
  video: fbdev: atmel_lcdfb: use ioremap_wc() for framebuffer
  video: fbdev: geode gxfb: use ioremap_wc() for framebuffer
  video: fbdev: gxt4500: use pci_ioremap_wc_bar() for framebuffer
  mtrr: bury MTRR - unexport mtrr_add() and mtrr_del()

 Documentation/driver-model/devres.txt            |  1 +
 arch/x86/include/asm/io.h                        |  6 ++
 arch/x86/include/asm/mtrr.h                      |  7 +-
 arch/x86/kernel/cpu/mtrr/cleanup.c               |  2 +-
 arch/x86/kernel/cpu/mtrr/generic.c               |  7 +-
 arch/x86/kernel/cpu/mtrr/if.c                    |  3 +
 arch/x86/kernel/cpu/mtrr/main.c                  | 73 +++++++++++++------
 drivers/gpu/drm/drm_ioctl.c                      | 14 +---
 drivers/infiniband/hw/ipath/ipath_driver.c       |  7 +-
 drivers/infiniband/hw/ipath/ipath_kernel.h       |  4 +-
 drivers/infiniband/hw/ipath/ipath_wc_x86_64.c    | 47 +++++--------
 drivers/infiniband/hw/qib/qib_wc_x86_64.c        | 31 ++------
 drivers/media/pci/ivtv/ivtvfb.c                  | 51 ++++----------
 drivers/message/fusion/mptbase.c                 | 19 ++---
 drivers/message/fusion/mptbase.h                 |  2 +-
 drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 36 +++-------
 drivers/pci/pci.c                                | 14 ++++
 drivers/staging/sm750fb/sm750.c                  | 34 ++-------
 drivers/staging/sm750fb/sm750.h                  |  3 -
 drivers/staging/sm750fb/sm750_hw.c               |  3 +-
 drivers/staging/xgifb/XGI_main_26.c              | 27 ++-----
 drivers/video/fbdev/arkfb.c                      | 36 ++--------
 drivers/video/fbdev/atmel_lcdfb.c                |  3 +-
 drivers/video/fbdev/aty/aty128fb.c               | 36 ++--------
 drivers/video/fbdev/aty/atyfb.h                  |  5 +-
 drivers/video/fbdev/aty/atyfb_base.c             | 90 ++++++++----------------
 drivers/video/fbdev/aty/radeon_base.c            | 29 ++------
 drivers/video/fbdev/aty/radeonfb.h               |  2 +-
 drivers/video/fbdev/gbefb.c                      | 18 +++--
 drivers/video/fbdev/geode/gxfb_core.c            |  3 +-
 drivers/video/fbdev/gxt4500.c                    |  2 +-
 drivers/video/fbdev/i740fb.c                     | 35 ++-------
 drivers/video/fbdev/i810/i810.h                  |  3 +-
 drivers/video/fbdev/i810/i810_main.c             | 11 +--
 drivers/video/fbdev/i810/i810_main.h             | 26 -------
 drivers/video/fbdev/intelfb/intelfb.h            |  4 +-
 drivers/video/fbdev/intelfb/intelfbdrv.c         | 38 ++--------
 drivers/video/fbdev/kyro/fbdev.c                 | 33 +++------
 drivers/video/fbdev/matrox/matroxfb_base.c       | 36 ++++------
 drivers/video/fbdev/matrox/matroxfb_base.h       | 27 +------
 drivers/video/fbdev/neofb.c                      | 26 ++-----
 drivers/video/fbdev/nvidia/nv_type.h             |  7 +-
 drivers/video/fbdev/nvidia/nvidia.c              | 37 ++--------
 drivers/video/fbdev/pm2fb.c                      | 31 ++------
 drivers/video/fbdev/pm3fb.c                      | 30 ++------
 drivers/video/fbdev/riva/fbdev.c                 | 39 ++--------
 drivers/video/fbdev/riva/rivafb.h                |  4 +-
 drivers/video/fbdev/s3fb.c                       | 35 ++-------
 drivers/video/fbdev/savage/savagefb.h            |  4 +-
 drivers/video/fbdev/savage/savagefb_driver.c     | 17 +----
 drivers/video/fbdev/sis/sis.h                    |  2 +-
 drivers/video/fbdev/sis/sis_main.c               | 27 ++-----
 drivers/video/fbdev/tdfxfb.c                     | 41 ++---------
 drivers/video/fbdev/vesafb.c                     | 77 +++++++-------------
 drivers/video/fbdev/vt8623fb.c                   | 31 ++------
 include/asm-generic/pci_iomap.h                  | 14 ++++
 include/linux/io.h                               | 12 ++++
 include/linux/pci.h                              |  1 +
 include/video/kyro.h                             |  4 +-
 include/video/neomagic.h                         |  5 +-
 include/video/tdfx.h                             |  2 +-
 lib/devres.c                                     | 29 ++++++++
 lib/pci_iomap.c                                  | 61 ++++++++++++++++
 63 files changed, 463 insertions(+), 901 deletions(-)

-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 01/47] x86: mtrr: annotate mtrr_type_lookup() is only implemented on generic_mtrr_ops

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:23:09

From: "Luis R. Rodriguez" <redacted>

There area few users of mtrr_type_lookup(), including PAT.
Note that PAT can be in theory enabled without MTRR fully
kicking in, such is the case with Xen.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: bhelgaas@google.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/kernel/cpu/mtrr/generic.c | 2 ++
 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 7d74f7b..09c82de 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -230,6 +230,8 @@ u8 mtrr_type_lookup(u64 start, u64 end)
 	int repeat;
 	u64 partial_end;
 
+	/* XXX: Currently only implemented on generic_mtrr_ops */
+
 	type = __mtrr_type_lookup(start, end, &partial_end, &repeat);
 
 	/*
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:25:24

From: "Luis R. Rodriguez" <redacted>

It is possible to enable CONFIG_MTRR and up with it
disabled at run time and yet CONFIG_X86_PAT continues
to kick through fully functionally. This can happen
for instance on Xen where MTRR is not supported but
PAT is, this can happen now on Linux as of commit
47591df50 by Juergen introduced as of v3.19.

Technically we should assume the proper CPU
bits would be set to disable MTRR but we can't
always rely on this. At least on the Xen Hypervisor
for instance only X86_FEATURE_MTRR was disabled
as of Xen 4.4 through Xen commit 586ab6a [0],
but not X86_FEATURE_K6_MTRR, X86_FEATURE_CENTAUR_MCR,
or X86_FEATURE_CYRIX_ARR for instance.

x86 mtrr code relies on quite a bit of checks for
mtrr_if being set to check to see if MTRR did get
set up, instead of using that lets provide a generic
setter which when set we know MTRR is enabled. This
also adds a few checks where they were not before
which could potentially safeguard ourselves against
incorrect usage of MTRR where this was not desirable.

Where possible match error codes as if MTRR was
disabled on arch/x86/include/asm/mtrr.h.

Lastly, since disabling MTRR can happen at run time
and we could end up with PAT enabled best record now
on our logs when MTRR is disabled.

[0] ~/devel/xen (git::stable-4.5)$ git describe --contains 586ab6a
4.4.0-rc1~18

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: bhelgaas@google.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/include/asm/mtrr.h        |  2 ++
 arch/x86/kernel/cpu/mtrr/cleanup.c |  2 +-
 arch/x86/kernel/cpu/mtrr/generic.c |  5 +++--
 arch/x86/kernel/cpu/mtrr/if.c      |  3 +++
 arch/x86/kernel/cpu/mtrr/main.c    | 31 ++++++++++++++++++++++---------
 5 files changed, 31 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index f768f62..cade917 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -31,6 +31,7 @@
  * arch_phys_wc_add and arch_phys_wc_del.
  */
 # ifdef CONFIG_MTRR
+extern int mtrr_enabled;
 extern u8 mtrr_type_lookup(u64 addr, u64 end);
 extern void mtrr_save_fixed_ranges(void *);
 extern void mtrr_save_state(void);
@@ -50,6 +51,7 @@ extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 extern int amd_special_default_mtrr(void);
 extern int phys_wc_to_mtrr_index(int handle);
 #  else
+static const int mtrr_enabled;
 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 {
 	/*
diff --git a/arch/x86/kernel/cpu/mtrr/cleanup.c b/arch/x86/kernel/cpu/mtrr/cleanup.c
index 5f90b85..784dc55 100644
--- a/arch/x86/kernel/cpu/mtrr/cleanup.c
+++ b/arch/x86/kernel/cpu/mtrr/cleanup.c
@@ -880,7 +880,7 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
 	 * Make sure we only trim uncachable memory on machines that
 	 * support the Intel MTRR architecture:
 	 */
-	if (!is_cpu(INTEL) || disable_mtrr_trim)
+	if (!is_cpu(INTEL) || disable_mtrr_trim || !mtrr_enabled)
 		return 0;
 
 	rdmsr(MSR_MTRRdefType, def, dummy);
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 09c82de..df321b2 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -116,7 +116,8 @@ static u8 __mtrr_type_lookup(u64 start, u64 end, u64 *partial_end, int *repeat)
 	u8 prev_match, curr_match;
 
 	*repeat = 0;
-	if (!mtrr_state_set)
+	/* generic_mtrr_ops is only set for generic_mtrr_ops */
+	if (!mtrr_state_set || !mtrr_enabled)
 		return 0xFF;
 
 	if (!mtrr_state.enabled)
@@ -290,7 +291,7 @@ static void get_fixed_ranges(mtrr_type *frs)
 
 void mtrr_save_fixed_ranges(void *info)
 {
-	if (cpu_has_mtrr)
+	if (mtrr_enabled && cpu_has_mtrr)
 		get_fixed_ranges(mtrr_state.fixed_ranges);
 }
 
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index d76f13d..e9e001a 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -436,6 +436,9 @@ static int __init mtrr_if_init(void)
 {
 	struct cpuinfo_x86 *c = &boot_cpu_data;
 
+	if (!mtrr_enabled)
+		return 0;
+
 	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
 	    (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
 	    (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index ea5f363..7db9c47 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -59,6 +59,7 @@
 #define MTRR_TO_PHYS_WC_OFFSET 1000
 
 u32 num_var_ranges;
+int mtrr_enabled;
 
 unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 static DEFINE_MUTEX(mtrr_mutex);
@@ -84,6 +85,9 @@ static int have_wrcomb(void)
 {
 	struct pci_dev *dev;
 
+	if (!mtrr_enabled)
+		return 0;
+
 	dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL);
 	if (dev != NULL) {
 		/*
@@ -286,7 +290,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
 	int i, replace, error;
 	mtrr_type ltype;
 
-	if (!mtrr_if)
+	if (!mtrr_enabled)
 		return -ENXIO;
 
 	error = mtrr_if->validate_add_page(base, size, type);
@@ -388,6 +392,8 @@ int mtrr_add_page(unsigned long base, unsigned long size,
 
 static int mtrr_check(unsigned long base, unsigned long size)
 {
+	if (!mtrr_enabled)
+		return -ENODEV;
 	if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
 		pr_warning("mtrr: size and base must be multiples of 4 kiB\n");
 		pr_debug("mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
@@ -463,8 +469,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 	unsigned long lbase, lsize;
 	int error = -EINVAL;
 
-	if (!mtrr_if)
-		return -ENXIO;
+	if (!mtrr_enabled)
+		return -ENODEV;
 
 	max = num_var_ranges;
 	/* No CPU hotplug when we change MTRR entries */
@@ -523,6 +529,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
  */
 int mtrr_del(int reg, unsigned long base, unsigned long size)
 {
+	if (!mtrr_enabled)
+		return -ENODEV;
 	if (mtrr_check(base, size))
 		return -EINVAL;
 	return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
@@ -545,7 +553,7 @@ int arch_phys_wc_add(unsigned long base, unsigned long size)
 {
 	int ret;
 
-	if (pat_enabled)
+	if (pat_enabled || !mtrr_enabled)
 		return 0;  /* Success!  (We don't need to do anything.) */
 
 	ret = mtrr_add(base, size, MTRR_TYPE_WRCOMB, true);
@@ -734,6 +742,7 @@ void __init mtrr_bp_init(void)
 	}
 
 	if (mtrr_if) {
+		mtrr_enabled = true;
 		set_num_var_ranges();
 		init_table();
 		if (use_intel()) {
@@ -744,12 +753,13 @@ void __init mtrr_bp_init(void)
 				mtrr_if->set_all();
 			}
 		}
-	}
+	} else
+		pr_info("mtrr: system does not support MTRR\n");
 }
 
 void mtrr_ap_init(void)
 {
-	if (!use_intel() || mtrr_aps_delayed_init)
+	if (!use_intel() || mtrr_aps_delayed_init || !mtrr_enabled)
 		return;
 	/*
 	 * Ideally we should hold mtrr_mutex here to avoid mtrr entries
@@ -774,6 +784,9 @@ void mtrr_save_state(void)
 {
 	int first_cpu;
 
+	if (!mtrr_enabled)
+		return;
+
 	get_online_cpus();
 	first_cpu = cpumask_first(cpu_online_mask);
 	smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
@@ -782,7 +795,7 @@ void mtrr_save_state(void)
 
 void set_mtrr_aps_delayed_init(void)
 {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
 		return;
 
 	mtrr_aps_delayed_init = true;
@@ -810,7 +823,7 @@ void mtrr_aps_init(void)
 
 void mtrr_bp_restore(void)
 {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
 		return;
 
 	mtrr_if->set_all();
@@ -818,7 +831,7 @@ void mtrr_bp_restore(void)
 
 static int __init mtrr_init_finialize(void)
 {
-	if (!mtrr_if)
+	if (!mtrr_enabled)
 		return 0;
 
 	if (use_intel()) {
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 03/47] devres: add devm_ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:27:33

From: "Luis R. Rodriguez" <redacted>

We have devm_ioremap_nocache() but no devm_ioremap_wc()
so add that. This will be used later.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 Documentation/driver-model/devres.txt |  1 +
 include/linux/io.h                    |  2 ++
 lib/devres.c                          | 29 +++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index e1e2bbd..831a536 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -276,6 +276,7 @@ IOMAP
   devm_ioport_unmap()
   devm_ioremap()
   devm_ioremap_nocache()
+  devm_ioremap_wc()
   devm_ioremap_resource() : checks resource, requests memory region, ioremaps
   devm_iounmap()
   pcim_iomap()
diff --git a/include/linux/io.h b/include/linux/io.h
index 4cc299c..91101a1 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -72,6 +72,8 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 			   resource_size_t size);
 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 				   resource_size_t size);
+void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
+			      resource_size_t size);
 void devm_iounmap(struct device *dev, void __iomem *addr);
 int check_signature(const volatile void __iomem *io_addr,
 			const unsigned char *signature, int length);
diff --git a/lib/devres.c b/lib/devres.c
index 0f1dd2e..2eb2bfe 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -72,6 +72,35 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 EXPORT_SYMBOL(devm_ioremap_nocache);
 
 /**
+ * devm_ioremap_wc - Managed ioremap_wc()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap_wc().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
+			      resource_size_t size)
+{
+	void __iomem **ptr, *addr;
+
+	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	addr = ioremap_wc(offset, size);
+	if (addr) {
+		*ptr = addr;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return addr;
+}
+EXPORT_SYMBOL_GPL(devm_ioremap_wc);
+
+/**
  * devm_iounmap - Managed iounmap()
  * @dev: Generic device to unmap for
  * @addr: Address to unmap
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 04/47] pci: add pci_ioremap_wc_bar()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:29:45

From: "Luis R. Rodriguez" <redacted>

This lets drivers take advanate of PAT when available. This
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..6afd507 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 				     pci_resource_len(pdev, bar));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+	/*
+	 * Make sure the BAR is actually a memory resource, not an IO resource
+	 */
+	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+		WARN_ON(1);
+		return NULL;
+	}
+	return ioremap_wc(pci_resource_start(pdev, bar),
+			  pci_resource_len(pdev, bar));
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar);
 #endif
 
 #define PCI_FIND_CAP_TTL	48
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 211e9da..c235b09 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1667,6 +1667,7 @@ static inline void pci_mmcfg_late_init(void) { }
 int pci_ext_cfg_avail(void);
 
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar);
 
 #ifdef CONFIG_PCI_IOV
 int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:32:03

From: "Luis R. Rodriguez" <redacted>

This allows drivers to take advantage of write-combining
when possible. Ideally we'd have pci_read_bases() just
peg an IORESOURCE_WC flag for us but where exactly
video devices memory lie varies *largely* and at times things
are mixed with MMIO registers, sometimes we can address
the changes in drivers, other times the change requires
intrusive changes.

Although there is also arch_phys_wc_add() that makes use of
architecture specific write-combinging alternatives (MTRR on
x86 when a system does not have PAT) we void polluting
pci_iomap() space with it and force drivers and subsystems
that want to use it to be explicit.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 include/asm-generic/pci_iomap.h | 14 ++++++++++
 lib/pci_iomap.c                 | 61 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index 7389c87..b1e17fc 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h
@@ -15,9 +15,13 @@ struct pci_dev;
 #ifdef CONFIG_PCI
 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+extern void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max);
 extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
 				     unsigned long offset,
 				     unsigned long maxlen);
+extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
+					unsigned long offset,
+					unsigned long maxlen);
 /* Create a virtual mapping cookie for a port on a given PCI device.
  * Do not call this directly, it exists to make it easier for architectures
  * to override */
@@ -34,12 +38,22 @@ static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned lon
 	return NULL;
 }
 
+static inline void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max)
+{
+	return NULL;
+}
 static inline void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
 					    unsigned long offset,
 					    unsigned long maxlen)
 {
 	return NULL;
 }
+static inline void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
+					       unsigned long offset,
+					       unsigned long maxlen)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __ASM_GENERIC_IO_H */
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index bcce5f1..30b65ae 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -52,6 +52,46 @@ void __iomem *pci_iomap_range(struct pci_dev *dev,
 EXPORT_SYMBOL(pci_iomap_range);
 
 /**
+ * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @offset: map memory at the given offset in BAR
+ * @maxlen: max length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way. When possible write combining
+ * is used.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR from offset to the end, pass %0 here.
+ * */
+void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
+				 int bar,
+				 unsigned long offset,
+				 unsigned long maxlen)
+{
+	resource_size_t start = pci_resource_start(dev, bar);
+	resource_size_t len = pci_resource_len(dev, bar);
+	unsigned long flags = pci_resource_flags(dev, bar);
+
+	if (len <= offset || !start)
+		return NULL;
+	len -= offset;
+	start += offset;
+	if (maxlen && len > maxlen)
+		len = maxlen;
+	if (flags & IORESOURCE_IO)
+		return __pci_ioport_map(dev, start, len);
+	if (flags & IORESOURCE_MEM)
+		return ioremap_wc(start, len);
+	/* What? */
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
+
+/**
  * pci_iomap - create a virtual mapping cookie for a PCI BAR
  * @dev: PCI device that owns the BAR
  * @bar: BAR number
@@ -70,4 +110,25 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 	return pci_iomap_range(dev, bar, 0, maxlen);
 }
 EXPORT_SYMBOL(pci_iomap);
+
+/**
+ * pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @maxlen: length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way. When possible write combining
+ * is used.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR without checking for its length first, pass %0 here.
+ * */
+void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+	return pci_iomap_wc_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL_GPL(pci_iomap_wc);
 #endif /* CONFIG_PCI */
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 06/47] mtrr: add __arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:34:13

From: "Luis R. Rodriguez" <redacted>

Ideally on systems using PAT we can expect a swift
transition away from MTRR. There can be a few exceptions
to this, one is where device drivers are known to exist
on PATs with errata, another situation is observed on
old device drivers where devices had combined MMIO
register access with whatever area they typically
later wanted to end up using MTRR for on the same
PCI BAR. This situation can still be addressed by
splitting up ioremap'd PCI BAR into two ioremap'd
calls, one for MMIO registers, and another for whatever
is desirable for write-combining -- in order to
accomplish this though quite a bit of driver
restructuring is required.

Device drivers which are known to require large
amount of re-work in order to split ioremap'd areas
can use __arch_phys_wc_add() to avoid regressions
when PAT is enabled.

For a good example driver where things are neatly
split up on a PCI BAR refer the infiniband qib
driver. For a good example of a driver where good
amount of work is required refer to the infiniband
ipath driver.

This is *only* a transitive API -- and as such no new
drivers are ever expected to use this.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/include/asm/io.h       |  4 ++++
 arch/x86/kernel/cpu/mtrr/main.c | 36 +++++++++++++++++++++++++++++-------
 include/linux/io.h              |  4 ++++
 3 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 34a5b93..a144d05 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -338,6 +338,10 @@ extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
 #define IO_SPACE_LIMIT 0xffff
 
 #ifdef CONFIG_MTRR
+extern int __must_check __arch_phys_wc_add(unsigned long base,
+					   unsigned long size);
+#define __arch_phys_wc_add __arch_phys_wc_add
+
 extern int __must_check arch_phys_wc_add(unsigned long base,
 					 unsigned long size);
 extern void arch_phys_wc_del(int handle);
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 7db9c47..5ae830b 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -538,23 +538,24 @@ int mtrr_del(int reg, unsigned long base, unsigned long size)
 EXPORT_SYMBOL(mtrr_del);
 
 /**
- * arch_phys_wc_add - add a WC MTRR and handle errors if PAT is unavailable
+ * __arch_phys_wc_add - add a WC MTRR even if PAT is available
  * @base: Physical base address
  * @size: Size of region
  *
- * If PAT is available, this does nothing.  If PAT is unavailable, it
- * attempts to add a WC MTRR covering size bytes starting at base and
- * logs an error if this fails.
+ * We typically do not want to use MTRR if PAT is available but there
+ * are some drivers which require significant work to get this to work
+ * properly. This call should only be used by those drivers where it is
+ * clear that hard work is required to modify them to use arch_phys_wc_add()
  *
  * Drivers must store the return value to pass to mtrr_del_wc_if_needed,
  * but drivers should not try to interpret that return value.
  */
-int arch_phys_wc_add(unsigned long base, unsigned long size)
+int __arch_phys_wc_add(unsigned long base, unsigned long size)
 {
 	int ret;
 
-	if (pat_enabled || !mtrr_enabled)
-		return 0;  /* Success!  (We don't need to do anything.) */
+	if (!mtrr_enabled)
+		return 0;
 
 	ret = mtrr_add(base, size, MTRR_TYPE_WRCOMB, true);
 	if (ret < 0) {
@@ -564,6 +565,27 @@ int arch_phys_wc_add(unsigned long base, unsigned long size)
 	}
 	return ret + MTRR_TO_PHYS_WC_OFFSET;
 }
+EXPORT_SYMBOL_GPL(__arch_phys_wc_add);
+
+/**
+ * arch_phys_wc_add - add a WC MTRR and handle errors if PAT is unavailable
+ * @base: Physical base address
+ * @size: Size of region
+ *
+ * If PAT is available, this does nothing.  If PAT is unavailable, it
+ * attempts to add a WC MTRR covering size bytes starting at base and
+ * logs an error if this fails.
+ *
+ * Drivers must store the return value to pass to mtrr_del_wc_if_needed,
+ * but drivers should not try to interpret that return value.
+ */
+int arch_phys_wc_add(unsigned long base, unsigned long size)
+{
+	if (pat_enabled || !mtrr_enabled)
+		return 0;  /* Success!  (We don't need to do anything.) */
+
+	return __arch_phys_wc_add(base, size);
+}
 EXPORT_SYMBOL(arch_phys_wc_add);
 
 /*
diff --git a/include/linux/io.h b/include/linux/io.h
index 91101a1..ecc51c3 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -111,6 +111,10 @@ static inline void arch_phys_wc_del(int handle)
 }
 
 #define arch_phys_wc_add arch_phys_wc_add
+#ifndef __arch_phys_wc_add
+#define __arch_phys_wc_add arch_phys_wc_add
+#endif
+
 #endif
 
 #endif /* _LINUX_IO_H */
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 07/47] video: fbdev: atyfb: move framebuffer length fudging to helper

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:36:24

From: "Luis R. Rodriguez" <redacted>

The size of the framebuffer to be used needs to
be fudged to account for the different type of
devices that are out there. This captures what
is required to do well, we'll resuse this later.

This has no functional changes.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/atyfb_base.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8789e48..16936bb 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -427,6 +427,20 @@ static struct {
 #endif /* CONFIG_FB_ATY_CT */
 };
 
+/*
+ * Last page of 8 MB (4 MB on ISA) aperture is MMIO,
+ * unless the auxiliary register aperture is used.
+ */
+static void aty_fudge_framebuffer_len(struct fb_info *info)
+{
+	struct atyfb_par *par = (struct atyfb_par *) info->par;
+
+	if (!par->aux_start &&
+	    (info->fix.smem_len = 0x800000 ||
+	     (par->bus_type = ISA && info->fix.smem_len = 0x400000)))
+		info->fix.smem_len -= GUI_RESERVE;
+}
+
 static int correct_chipset(struct atyfb_par *par)
 {
 	u8 rev;
@@ -2603,14 +2617,7 @@ static int aty_init(struct fb_info *info)
 	if (par->pll_ops->resume_pll)
 		par->pll_ops->resume_pll(info, &par->pll);
 
-	/*
-	 * Last page of 8 MB (4 MB on ISA) aperture is MMIO,
-	 * unless the auxiliary register aperture is used.
-	 */
-	if (!par->aux_start &&
-	    (info->fix.smem_len = 0x800000 ||
-	     (par->bus_type = ISA && info->fix.smem_len = 0x400000)))
-		info->fix.smem_len -= GUI_RESERVE;
+	aty_fudge_framebuffer_len(info);
 
 	/*
 	 * Disable register access through the linear aperture
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 08/47] video: fbdev: atyfb: clarify ioremap() base and length used

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:38:36

From: "Luis R. Rodriguez" <redacted>

This has no functional changes, it just adjusts
the ioremap() call for the framebuffer to use
the same values we later use for the framebuffer,
this will make it easier to review the next change.

The size of the framebuffer varies but since this is
for PCI we *know* this defaults to 0x800000.
atyfb_setup_generic() is *only* used on PCI probe.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/atyfb_base.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 16936bb..8025624 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -3489,7 +3489,9 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 
 	/* Map in frame buffer */
 	info->fix.smem_start = addr;
-	info->screen_base = ioremap(addr, 0x800000);
+	info->fix.smem_len = 0x800000;
+
+	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 	if (info->screen_base = NULL) {
 		ret = -ENOMEM;
 		goto atyfb_setup_generic_fail;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:40:47

From: "Luis R. Rodriguez" <redacted>

The atyfb driver uses an MTRR work around since some
cards use the same PCI BAR for the framebuffer and MMIO.
In such cards the last page is used for MMIO, the rest for
the framebuffer, so on those cards we ioremap() the MMIO
page alone, then again ioremap() the full framebuffer
including the MMIO space *and* ___then___ use an MTRR with
MTRR_TYPE_WRCOMB on the full PCI BAR... and finally "hole"
in an MTRR_TYPE_UNCACHABLE MTRR only for MMIO.

This is a terrible fucking work around, and should by no means
be necessary however evidence through a large series of conversion
of drivers to ioremap_wc() for the framebuffer shows that around
the time MTRR started becoming popular devices did not have things
lined up for easily separating the framebuffer and MMIO register
access. In some cases a driver requires significant intrusive
changes in order to make the split for an ioremap() for MMIO registers
and another ioremap_wc() for the framebuffer, at other times a
bit of careful study of the driver suffices. This example driver
falls into the later category.

We can replace the MTRR MTRR_TYPE_UNCACHABLE
work around by using ioremap_nocache(), the length of the
MMIO space should already be correct. The other part we
need to correct is ensuring we ioremap() for the framebuffer
only the required size. Since the ioremap() happens early
on probe for PCI devices before aty_init() where we typically
adjust the length and know how to do it, we can fix this by
pegging the bus type as PCI on PCI probe, and finally fudging
and framebuffer length just as we do on aty_init().

The last thing we do must do to remain sane is ensure we
use the info->fix.smem_start and info->fix.smem_len for
the framebuffer MTRR as we know that is always well adjusted.
The *one* concern here would be if the MTRR is not in units
of 4K __but__ we already know that in the PCI case this cannot
happen, in the shared space setting the MTRR would be up to
0x7ff000 and assuming a 4K page:

; 0x7ff000 / 0x1000
	2047

Also, internally when MTRR is used mtrr_add() will use mtrr_check()
and that should splat a warning when the MTRR base and size are
not compatible with what is expected for MTRR usage.

This fix lets us nuke the MTRR_TYPE_UNCACHABLE MTRR "hole".

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/atyfb.h      |  1 -
 drivers/video/fbdev/aty/atyfb_base.c | 28 ++++++----------------------
 2 files changed, 6 insertions(+), 23 deletions(-)
diff --git a/drivers/video/fbdev/aty/atyfb.h b/drivers/video/fbdev/aty/atyfb.h
index 1f39a62..89ec439 100644
--- a/drivers/video/fbdev/aty/atyfb.h
+++ b/drivers/video/fbdev/aty/atyfb.h
@@ -184,7 +184,6 @@ struct atyfb_par {
 	spinlock_t int_lock;
 #ifdef CONFIG_MTRR
 	int mtrr_aper;
-	int mtrr_reg;
 #endif
 	u32 mem_cntl;
 	struct crtc saved_crtc;
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)
 
 #ifdef CONFIG_MTRR
 	par->mtrr_aper = -1;
-	par->mtrr_reg = -1;
 	if (!nomtrr) {
-		/* Cover the whole resource. */
-		par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+		par->mtrr_aper = mtrr_add(info->fix.smem_start,
+					  info->fix.smem_len,
 					  MTRR_TYPE_WRCOMB, 1);
-		if (par->mtrr_aper >= 0 && !par->aux_start) {
-			/* Make a hole for mmio. */
-			par->mtrr_reg = mtrr_add(par->res_start + 0x800000 -
-						 GUI_RESERVE, GUI_RESERVE,
-						 MTRR_TYPE_UNCACHABLE, 1);
-			if (par->mtrr_reg < 0) {
-				mtrr_del(par->mtrr_aper, 0, 0);
-				par->mtrr_aper = -1;
-			}
-		}
 	}
 #endif
 
@@ -2776,10 +2765,6 @@ aty_init_exit:
 	par->pll_ops->set_pll(info, &par->saved_pll);
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
@@ -3466,7 +3451,7 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	}
 
 	info->fix.mmio_start = raddr;
-	par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+	par->ati_regbase = ioremap_nocache(info->fix.mmio_start, 0x1000);
 	if (par->ati_regbase = NULL)
 		return -ENOMEM;
 
@@ -3491,6 +3476,8 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	info->fix.smem_start = addr;
 	info->fix.smem_len = 0x800000;
 
+	aty_fudge_framebuffer_len(info);
+
 	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 	if (info->screen_base = NULL) {
 		ret = -ENOMEM;
@@ -3563,6 +3550,7 @@ static int atyfb_pci_probe(struct pci_dev *pdev,
 		return -ENOMEM;
 	}
 	par = info->par;
+	par->bus_type = PCI;
 	info->fix = atyfb_fix;
 	info->device = &pdev->dev;
 	par->pci_id = pdev->device;
@@ -3732,10 +3720,6 @@ static void atyfb_remove(struct fb_info *info)
 #endif
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 10/47] video: fbdev: atyfb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:43:01

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/atyfb.h      |  4 +---
 drivers/video/fbdev/aty/atyfb_base.c | 41 +++++++++---------------------------
 2 files changed, 11 insertions(+), 34 deletions(-)
diff --git a/drivers/video/fbdev/aty/atyfb.h b/drivers/video/fbdev/aty/atyfb.h
index 89ec439..63c4842 100644
--- a/drivers/video/fbdev/aty/atyfb.h
+++ b/drivers/video/fbdev/aty/atyfb.h
@@ -182,9 +182,7 @@ struct atyfb_par {
 	unsigned long irq_flags;
 	unsigned int irq;
 	spinlock_t int_lock;
-#ifdef CONFIG_MTRR
-	int mtrr_aper;
-#endif
+	int wc_cookie;
 	u32 mem_cntl;
 	struct crtc saved_crtc;
 	union aty_pll saved_pll;
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8875e56..af278bb 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -98,9 +98,6 @@
 #ifdef CONFIG_PMAC_BACKLIGHT
 #include <asm/backlight.h>
 #endif
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 
 /*
  * Debug flags.
@@ -303,9 +300,7 @@ static struct fb_ops atyfb_ops = {
 };
 
 static bool noaccel;
-#ifdef CONFIG_MTRR
 static bool nomtrr;
-#endif
 static int vram;
 static int pll;
 static int mclk;
@@ -2628,14 +2623,9 @@ static int aty_init(struct fb_info *info)
 		aty_st_le32(BUS_CNTL, aty_ld_le32(BUS_CNTL, par) |
 			    BUS_APER_REG_DIS, par);
 
-#ifdef CONFIG_MTRR
-	par->mtrr_aper = -1;
-	if (!nomtrr) {
-		par->mtrr_aper = mtrr_add(info->fix.smem_start,
-					  info->fix.smem_len,
-					  MTRR_TYPE_WRCOMB, 1);
-	}
-#endif
+	if (!nomtrr)
+		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+						  info->fix.smem_len);
 
 	info->fbops = &atyfb_ops;
 	info->pseudo_palette = par->pseudo_palette;
@@ -2763,13 +2753,8 @@ aty_init_exit:
 	/* restore video mode */
 	aty_set_crtc(par, &par->saved_crtc);
 	par->pll_ops->set_pll(info, &par->saved_pll);
+	arch_phys_wc_del(par->wc_cookie);
 
-#ifdef CONFIG_MTRR
-	if (par->mtrr_aper >= 0) {
-		mtrr_del(par->mtrr_aper, 0, 0);
-		par->mtrr_aper = -1;
-	}
-#endif
 	return ret;
 }
 
@@ -3478,7 +3463,8 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 
 	aty_fudge_framebuffer_len(info);
 
-	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
+	info->screen_base = ioremap_wc(info->fix.smem_start,
+				       info->fix.smem_len);
 	if (info->screen_base = NULL) {
 		ret = -ENOMEM;
 		goto atyfb_setup_generic_fail;
@@ -3652,7 +3638,8 @@ static int __init atyfb_atari_probe(void)
 		 * Map the video memory (physical address given)
 		 * to somewhere in the kernel address space.
 		 */
-		info->screen_base = ioremap(phys_vmembase[m64_num], phys_size[m64_num]);
+		info->screen_base = ioremap_wc(phys_vmembase[m64_num],
+					       phys_size[m64_num]);
 		info->fix.smem_start = (unsigned long)info->screen_base; /* Fake! */
 		par->ati_regbase = ioremap(phys_guiregbase[m64_num], 0x10000) +
 						0xFC00ul;
@@ -3719,12 +3706,8 @@ static void atyfb_remove(struct fb_info *info)
 		aty_bl_exit(info->bl_dev);
 #endif
 
-#ifdef CONFIG_MTRR
-	if (par->mtrr_aper >= 0) {
-		mtrr_del(par->mtrr_aper, 0, 0);
-		par->mtrr_aper = -1;
-	}
-#endif
+	arch_phys_wc_del(par->wc_cookie);
+
 #ifndef __sparc__
 	if (par->ati_regbase)
 		iounmap(par->ati_regbase);
@@ -3840,10 +3823,8 @@ static int __init atyfb_setup(char *options)
 	while ((this_opt = strsep(&options, ",")) != NULL) {
 		if (!strncmp(this_opt, "noaccel", 7)) {
 			noaccel = 1;
-#ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
-#endif
 		} else if (!strncmp(this_opt, "vram:", 5))
 			vram = simple_strtoul(this_opt + 5, NULL, 0);
 		else if (!strncmp(this_opt, "pll:", 4))
@@ -4013,7 +3994,5 @@ module_param(comp_sync, int, 0);
 MODULE_PARM_DESC(comp_sync, "Set composite sync signal to low (0) or high (1)");
 module_param(mode, charp, 0);
 MODULE_PARM_DESC(mode, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "bool: disable use of MTRR registers");
-#endif
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 11/47] IB/qib: add acounting for MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:45:12

From: "Luis R. Rodriguez" <redacted>

There is no good reason not to, we eventually delete it as well.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/infiniband/hw/qib/qib_wc_x86_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/qib/qib_wc_x86_64.c b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
index 81b225f..fe0850a 100644
--- a/drivers/infiniband/hw/qib/qib_wc_x86_64.c
+++ b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
@@ -118,7 +118,7 @@ int qib_enable_wc(struct qib_devdata *dd)
 	if (!ret) {
 		int cookie;
 
-		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 0);
+		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 1);
 		if (cookie < 0) {
 			{
 				qib_devinfo(dd->pcidev,
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 12/47] IB/qib: use arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:47:24

From: "Luis R. Rodriguez" <redacted>

This driver already makes use of ioremap_wc() on PIO buffers,
so convert it to use arch_phys_wc_add().

Cc: Rickard Strandqvist <redacted>
Cc: Dennis Dalessandro <redacted>
Cc: Mike Marciniszyn <redacted>
Cc: Roland Dreier <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/infiniband/hw/qib/qib_wc_x86_64.c | 31 ++++---------------------------
 1 file changed, 4 insertions(+), 27 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_wc_x86_64.c b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
index fe0850a..6d61ef9 100644
--- a/drivers/infiniband/hw/qib/qib_wc_x86_64.c
+++ b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
@@ -116,21 +116,9 @@ int qib_enable_wc(struct qib_devdata *dd)
 	}
 
 	if (!ret) {
-		int cookie;
-
-		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 1);
-		if (cookie < 0) {
-			{
-				qib_devinfo(dd->pcidev,
-					 "mtrr_add()  WC for PIO bufs failed (%d)\n",
-					 cookie);
-				ret = -EINVAL;
-			}
-		} else {
-			dd->wc_cookie = cookie;
-			dd->wc_base = (unsigned long) pioaddr;
-			dd->wc_len = (unsigned long) piolen;
-		}
+		dd->wc_cookie = arch_phys_wc_add(pioaddr, piolen);
+		if (dd->wc_cookie < 0)
+			ret = -EINVAL;
 	}
 
 	return ret;
@@ -142,18 +130,7 @@ int qib_enable_wc(struct qib_devdata *dd)
  */
 void qib_disable_wc(struct qib_devdata *dd)
 {
-	if (dd->wc_cookie) {
-		int r;
-
-		r = mtrr_del(dd->wc_cookie, dd->wc_base,
-			     dd->wc_len);
-		if (r < 0)
-			qib_devinfo(dd->pcidev,
-				 "mtrr_del(%lx, %lx, %lx) failed: %d\n",
-				 dd->wc_cookie, dd->wc_base,
-				 dd->wc_len, r);
-		dd->wc_cookie = 0; /* even on failure */
-	}
+	arch_phys_wc_del(dd->wc_cookie);
 }
 
 /**
-- 
2.3.2.209.gd67f9d5.dirty

Re: [PATCH v1 06/47] mtrr: add __arch_phys_wc_add()

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-20 23:49:11

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
From: "Luis R. Rodriguez" <redacted>

Ideally on systems using PAT we can expect a swift
transition away from MTRR. There can be a few exceptions
to this, one is where device drivers are known to exist
on PATs with errata, another situation is observed on
old device drivers where devices had combined MMIO
register access with whatever area they typically
later wanted to end up using MTRR for on the same
PCI BAR. This situation can still be addressed by
splitting up ioremap'd PCI BAR into two ioremap'd
calls, one for MMIO registers, and another for whatever
is desirable for write-combining -- in order to
accomplish this though quite a bit of driver
restructuring is required.

Device drivers which are known to require large
amount of re-work in order to split ioremap'd areas
can use __arch_phys_wc_add() to avoid regressions
when PAT is enabled.

For a good example driver where things are neatly
split up on a PCI BAR refer the infiniband qib
driver. For a good example of a driver where good
amount of work is required refer to the infiniband
ipath driver.

This is *only* a transitive API -- and as such no new
drivers are ever expected to use this.
What's the exact layout that this helps?  I'm sceptical that this can
ever be correct.

Is there some awful driver that has a large ioremap that's supposed to
contain multiple different memtypes?  If so, can we ioremap +
set_page_xyz instead?

--Andy

[PATCH v1 13/47] IB/ipath: add counting for MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:49:36

From: "Luis R. Rodriguez" <redacted>

There is no good reason not to, we eventually delete it as well.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/infiniband/hw/ipath/ipath_wc_x86_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c b/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
index 4ad0b93..70c1f3a 100644
--- a/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
+++ b/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
@@ -127,7 +127,7 @@ int ipath_enable_wc(struct ipath_devdata *dd)
 			   "(addr %llx, len=0x%llx)\n",
 			   (unsigned long long) pioaddr,
 			   (unsigned long long) piolen);
-		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 0);
+		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 1);
 		if (cookie < 0) {
 			{
 				dev_info(&dd->pcidev->dev,
-- 
2.3.2.209.gd67f9d5.dirty

Re: [PATCH v1 03/47] devres: add devm_ioremap_wc()

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-20 23:50:16

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
From: "Luis R. Rodriguez" <redacted>

We have devm_ioremap_nocache() but no devm_ioremap_wc()
so add that. This will be used later.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
Looks good to me.
quoted hunk
---
 Documentation/driver-model/devres.txt |  1 +
 include/linux/io.h                    |  2 ++
 lib/devres.c                          | 29 +++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index e1e2bbd..831a536 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -276,6 +276,7 @@ IOMAP
   devm_ioport_unmap()
   devm_ioremap()
   devm_ioremap_nocache()
+  devm_ioremap_wc()
   devm_ioremap_resource() : checks resource, requests memory region, ioremaps
   devm_iounmap()
   pcim_iomap()
diff --git a/include/linux/io.h b/include/linux/io.h
index 4cc299c..91101a1 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -72,6 +72,8 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
                           resource_size_t size);
 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
                                   resource_size_t size);
+void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
+                             resource_size_t size);
 void devm_iounmap(struct device *dev, void __iomem *addr);
 int check_signature(const volatile void __iomem *io_addr,
                        const unsigned char *signature, int length);
diff --git a/lib/devres.c b/lib/devres.c
index 0f1dd2e..2eb2bfe 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -72,6 +72,35 @@ void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 EXPORT_SYMBOL(devm_ioremap_nocache);

 /**
+ * devm_ioremap_wc - Managed ioremap_wc()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap_wc().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
+                             resource_size_t size)
+{
+       void __iomem **ptr, *addr;
+
+       ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+       if (!ptr)
+               return NULL;
+
+       addr = ioremap_wc(offset, size);
+       if (addr) {
+               *ptr = addr;
+               devres_add(dev, ptr);
+       } else
+               devres_free(ptr);
+
+       return addr;
+}
+EXPORT_SYMBOL_GPL(devm_ioremap_wc);
+
+/**
  * devm_iounmap - Managed iounmap()
  * @dev: Generic device to unmap for
  * @addr: Address to unmap
--
2.3.2.209.gd67f9d5.dirty


-- 
Andy Lutomirski
AMA Capital Management, LLC

Re: [PATCH v1 04/47] pci: add pci_ioremap_wc_bar()

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-20 23:50:59

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted hunk
From: "Luis R. Rodriguez" <redacted>

This lets drivers take advanate of PAT when available. This
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..6afd507 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
                                     pci_resource_len(pdev, bar));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+       /*
+        * Make sure the BAR is actually a memory resource, not an IO resource
+        */
+       if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+               WARN_ON(1);
+               return NULL;
+       }
if (WARN_ON(...))?

--Andy

[PATCH v1 14/47] IB/ipath: use __arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:51:49

From: "Luis R. Rodriguez" <redacted>

This driver sadly does not have the MMIO registers and WC
desired areas (PIO buffers in this case) properly split up
and addressing a split is considerable work, as such this
such requires using the __arch_phys_wc_add() call to
ensure write combining is enforced using MTRR on x86
even when PAT is available.

Cc: Rickard Strandqvist <redacted>
Cc: Mike Marciniszyn <redacted>
Cc: Roland Dreier <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/infiniband/hw/ipath/ipath_driver.c    |  7 ++--
 drivers/infiniband/hw/ipath/ipath_kernel.h    |  4 +--
 drivers/infiniband/hw/ipath/ipath_wc_x86_64.c | 47 ++++++++++-----------------
 3 files changed, 20 insertions(+), 38 deletions(-)
diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
index bd0caed..464f39c 100644
--- a/drivers/infiniband/hw/ipath/ipath_driver.c
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c
@@ -542,6 +542,7 @@ static int ipath_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dd->ipath_kregbase = __ioremap(addr, len,
 		(_PAGE_NO_CACHE|_PAGE_WRITETHRU));
 #else
+	/* XXX: split pio on a separate ioremap_wc() */
 	dd->ipath_kregbase = ioremap_nocache(addr, len);
 #endif
 
@@ -587,12 +588,8 @@ static int ipath_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	ret = ipath_enable_wc(dd);
 
-	if (ret) {
-		ipath_dev_err(dd, "Write combining not enabled "
-			      "(err %d): performance may be poor\n",
-			      -ret);
+	if (ret)
 		ret = 0;
-	}
 
 	ipath_verify_pioperf(dd);
 
diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index e08db70..f0f9471 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -463,9 +463,7 @@ struct ipath_devdata {
 	/* offset in HT config space of slave/primary interface block */
 	u8 ipath_ht_slave_off;
 	/* for write combining settings */
-	unsigned long ipath_wc_cookie;
-	unsigned long ipath_wc_base;
-	unsigned long ipath_wc_len;
+	int wc_cookie;
 	/* ref count for each pkey */
 	atomic_t ipath_pkeyrefs[4];
 	/* shadow copy of struct page *'s for exp tid pages */
diff --git a/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c b/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
index 70c1f3a..88709c1 100644
--- a/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
+++ b/drivers/infiniband/hw/ipath/ipath_wc_x86_64.c
@@ -37,7 +37,6 @@
  */
 
 #include <linux/pci.h>
-#include <asm/mtrr.h>
 #include <asm/processor.h>
 
 #include "ipath_kernel.h"
@@ -122,27 +121,26 @@ int ipath_enable_wc(struct ipath_devdata *dd)
 	}
 
 	if (!ret) {
-		int cookie;
 		ipath_cdbg(VERBOSE, "Setting mtrr for chip to WC "
 			   "(addr %llx, len=0x%llx)\n",
 			   (unsigned long long) pioaddr,
 			   (unsigned long long) piolen);
-		cookie = mtrr_add(pioaddr, piolen, MTRR_TYPE_WRCOMB, 1);
-		if (cookie < 0) {
-			{
-				dev_info(&dd->pcidev->dev,
-					 "mtrr_add()  WC for PIO bufs "
-					 "failed (%d)\n",
-					 cookie);
-				ret = -EINVAL;
-			}
-		} else {
-			ipath_cdbg(VERBOSE, "Set mtrr for chip to WC, "
-				   "cookie is %d\n", cookie);
-			dd->ipath_wc_cookie = cookie;
-			dd->ipath_wc_base = (unsigned long) pioaddr;
-			dd->ipath_wc_len = (unsigned long) piolen;
-		}
+		dd->wc_cookie = __arch_phys_wc_add(pioaddr, piolen);
+		if (dd->wc_cookie <= 0) {
+				/*
+				 * If MTRR is not available on an architecture
+				 * or if it could not be enabled at run time
+				 * folks who care should work towards the
+				 * ioremap_wc() split.
+				 */
+				if (!dd->wc_cookie)
+					ipath_dev_err(dd, "System does not support MTRR\n");
+				else {
+					ipath_dev_err(dd, "Seting mtrr failed on PIO buffers\n");
+					ret = -EINVAL;
+				}
+		} else
+			ipath_cdbg(VERBOSE, "Set mtrr for chip to WC\n");
 	}
 
 	return ret;
@@ -154,16 +152,5 @@ int ipath_enable_wc(struct ipath_devdata *dd)
  */
 void ipath_disable_wc(struct ipath_devdata *dd)
 {
-	if (dd->ipath_wc_cookie) {
-		int r;
-		ipath_cdbg(VERBOSE, "undoing WCCOMB on pio buffers\n");
-		r = mtrr_del(dd->ipath_wc_cookie, dd->ipath_wc_base,
-			     dd->ipath_wc_len);
-		if (r < 0)
-			dev_info(&dd->pcidev->dev,
-				 "mtrr_del(%lx, %lx, %lx) failed: %d\n",
-				 dd->ipath_wc_cookie, dd->ipath_wc_base,
-				 dd->ipath_wc_len, r);
-		dd->ipath_wc_cookie = 0; /* even on failure */
-	}
+	arch_phys_wc_del(dd->wc_cookie);
 }
-- 
2.3.2.209.gd67f9d5.dirty

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-20 23:52:45

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted hunk
From: "Luis R. Rodriguez" <redacted>

The atyfb driver uses an MTRR work around since some
cards use the same PCI BAR for the framebuffer and MMIO.
In such cards the last page is used for MMIO, the rest for
the framebuffer, so on those cards we ioremap() the MMIO
page alone, then again ioremap() the full framebuffer
including the MMIO space *and* ___then___ use an MTRR with
MTRR_TYPE_WRCOMB on the full PCI BAR... and finally "hole"
in an MTRR_TYPE_UNCACHABLE MTRR only for MMIO.

This is a terrible fucking work around, and should by no means
be necessary however evidence through a large series of conversion
of drivers to ioremap_wc() for the framebuffer shows that around
the time MTRR started becoming popular devices did not have things
lined up for easily separating the framebuffer and MMIO register
access. In some cases a driver requires significant intrusive
changes in order to make the split for an ioremap() for MMIO registers
and another ioremap_wc() for the framebuffer, at other times a
bit of careful study of the driver suffices. This example driver
falls into the later category.

We can replace the MTRR MTRR_TYPE_UNCACHABLE
work around by using ioremap_nocache(), the length of the
MMIO space should already be correct. The other part we
need to correct is ensuring we ioremap() for the framebuffer
only the required size. Since the ioremap() happens early
on probe for PCI devices before aty_init() where we typically
adjust the length and know how to do it, we can fix this by
pegging the bus type as PCI on PCI probe, and finally fudging
and framebuffer length just as we do on aty_init().

The last thing we do must do to remain sane is ensure we
use the info->fix.smem_start and info->fix.smem_len for
the framebuffer MTRR as we know that is always well adjusted.
The *one* concern here would be if the MTRR is not in units
of 4K __but__ we already know that in the PCI case this cannot
happen, in the shared space setting the MTRR would be up to
0x7ff000 and assuming a 4K page:

; 0x7ff000 / 0x1000
        2047

Also, internally when MTRR is used mtrr_add() will use mtrr_check()
and that should splat a warning when the MTRR base and size are
not compatible with what is expected for MTRR usage.

This fix lets us nuke the MTRR_TYPE_UNCACHABLE MTRR "hole".

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/atyfb.h      |  1 -
 drivers/video/fbdev/aty/atyfb_base.c | 28 ++++++----------------------
 2 files changed, 6 insertions(+), 23 deletions(-)
diff --git a/drivers/video/fbdev/aty/atyfb.h b/drivers/video/fbdev/aty/atyfb.h
index 1f39a62..89ec439 100644
--- a/drivers/video/fbdev/aty/atyfb.h
+++ b/drivers/video/fbdev/aty/atyfb.h
@@ -184,7 +184,6 @@ struct atyfb_par {
        spinlock_t int_lock;
 #ifdef CONFIG_MTRR
        int mtrr_aper;
-       int mtrr_reg;
 #endif
        u32 mem_cntl;
        struct crtc saved_crtc;
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)

 #ifdef CONFIG_MTRR
        par->mtrr_aper = -1;
-       par->mtrr_reg = -1;
        if (!nomtrr) {
-               /* Cover the whole resource. */
-               par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+               par->mtrr_aper = mtrr_add(info->fix.smem_start,
+                                         info->fix.smem_len,
                                          MTRR_TYPE_WRCOMB, 1);
-               if (par->mtrr_aper >= 0 && !par->aux_start) {
-                       /* Make a hole for mmio. */
-                       par->mtrr_reg = mtrr_add(par->res_start + 0x800000 -
-                                                GUI_RESERVE, GUI_RESERVE,
-                                                MTRR_TYPE_UNCACHABLE, 1);
-                       if (par->mtrr_reg < 0) {
-                               mtrr_del(par->mtrr_aper, 0, 0);
-                               par->mtrr_aper = -1;
-                       }
-               }
        }
 #endif
@@ -2776,10 +2765,6 @@ aty_init_exit:
        par->pll_ops->set_pll(info, &par->saved_pll);

 #ifdef CONFIG_MTRR
-       if (par->mtrr_reg >= 0) {
-               mtrr_del(par->mtrr_reg, 0, 0);
-               par->mtrr_reg = -1;
-       }
        if (par->mtrr_aper >= 0) {
                mtrr_del(par->mtrr_aper, 0, 0);
                par->mtrr_aper = -1;
@@ -3466,7 +3451,7 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
        }

        info->fix.mmio_start = raddr;
-       par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+       par->ati_regbase = ioremap_nocache(info->fix.mmio_start, 0x1000);
Double-check me, but I think that ioremap_nocache + WC MTRR = WC.  I
think we might need ioremap_nocache_me_harder (or maybe ioremap_x86_uc
if you prefer that bikeshed color) for this.

[PATCH v1 15/47] [media] media: ivtv: use __arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:54:00

From: "Luis R. Rodriguez" <redacted>

Sadly this driver requires a bit of work in order
to use ioremap_wc() on the range currently used
for MTRR write-combining. We'd need to ensure two
ioremap() calls are done. Annotate this.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Walls <awalls@md.metrocast.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: ivtv-devel@ivtvdriver.org
Cc: linux-media@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/media/pci/ivtv/ivtvfb.c | 51 +++++++++++------------------------------
 1 file changed, 14 insertions(+), 37 deletions(-)
diff --git a/drivers/media/pci/ivtv/ivtvfb.c b/drivers/media/pci/ivtv/ivtvfb.c
index 9ff1230..ceefa6f 100644
--- a/drivers/media/pci/ivtv/ivtvfb.c
+++ b/drivers/media/pci/ivtv/ivtvfb.c
@@ -44,10 +44,6 @@
 #include <linux/ivtvfb.h>
 #include <linux/slab.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include "ivtv-driver.h"
 #include "ivtv-cards.h"
 #include "ivtv-i2c.h"
@@ -155,12 +151,11 @@ struct osd_info {
 	/* Buffer size */
 	u32 video_buffer_size;
 
-#ifdef CONFIG_MTRR
 	/* video_base rounded down as required by hardware MTRRs */
 	unsigned long fb_start_aligned_physaddr;
 	/* video_base rounded up as required by hardware MTRRs */
 	unsigned long fb_end_aligned_physaddr;
-#endif
+	int wc_cookie;
 
 	/* Store the buffer offset */
 	int set_osd_coords_x;
@@ -1099,6 +1094,8 @@ static int ivtvfb_init_vidmode(struct ivtv *itv)
 static int ivtvfb_init_io(struct ivtv *itv)
 {
 	struct osd_info *oi = itv->osd_info;
+	/* Find the largest power of two that maps the whole buffer */
+	int size_shift = 31;
 
 	mutex_lock(&itv->serialize_lock);
 	if (ivtv_init_on_first_open(itv)) {
@@ -1132,29 +1129,16 @@ static int ivtvfb_init_io(struct ivtv *itv)
 			oi->video_pbase, oi->video_vbase,
 			oi->video_buffer_size / 1024);
 
-#ifdef CONFIG_MTRR
-	{
-		/* Find the largest power of two that maps the whole buffer */
-		int size_shift = 31;
-
-		while (!(oi->video_buffer_size & (1 << size_shift))) {
-			size_shift--;
-		}
-		size_shift++;
-		oi->fb_start_aligned_physaddr = oi->video_pbase & ~((1 << size_shift) - 1);
-		oi->fb_end_aligned_physaddr = oi->video_pbase + oi->video_buffer_size;
-		oi->fb_end_aligned_physaddr += (1 << size_shift) - 1;
-		oi->fb_end_aligned_physaddr &= ~((1 << size_shift) - 1);
-		if (mtrr_add(oi->fb_start_aligned_physaddr,
-			oi->fb_end_aligned_physaddr - oi->fb_start_aligned_physaddr,
-			     MTRR_TYPE_WRCOMB, 1) < 0) {
-			IVTVFB_INFO("disabled mttr\n");
-			oi->fb_start_aligned_physaddr = 0;
-			oi->fb_end_aligned_physaddr = 0;
-		}
-	}
-#endif
-
+	while (!(oi->video_buffer_size & (1 << size_shift)))
+		size_shift--;
+	size_shift++;
+	oi->fb_start_aligned_physaddr = oi->video_pbase & ~((1 << size_shift) - 1);
+	oi->fb_end_aligned_physaddr = oi->video_pbase + oi->video_buffer_size;
+	oi->fb_end_aligned_physaddr += (1 << size_shift) - 1;
+	oi->fb_end_aligned_physaddr &= ~((1 << size_shift) - 1);
+	oi->wc_cookie = __arch_phys_wc_add(oi->fb_start_aligned_physaddr,
+					   oi->fb_end_aligned_physaddr -
+					   oi->fb_start_aligned_physaddr);
 	/* Blank the entire osd. */
 	memset_io(oi->video_vbase, 0, oi->video_buffer_size);
 
@@ -1172,14 +1156,7 @@ static void ivtvfb_release_buffers (struct ivtv *itv)
 
 	/* Release pseudo palette */
 	kfree(oi->ivtvfb_info.pseudo_palette);
-
-#ifdef CONFIG_MTRR
-	if (oi->fb_end_aligned_physaddr) {
-		mtrr_del(-1, oi->fb_start_aligned_physaddr,
-			oi->fb_end_aligned_physaddr - oi->fb_start_aligned_physaddr);
-	}
-#endif
-
+	arch_phys_wc_del(oi->wc_cookie);
 	kfree(oi);
 	itv->osd_info = NULL;
 }
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 16/47] fusion: use __arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:56:13

From: "Luis R. Rodriguez" <redacted>

If and when this gets enabled the driver should address
using ioremap_wc() on the same area, that could require
a bit of work as it would mean a split with two ioremap'd
areas. Annotate this.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Nagalakshmi Nandigama <redacted>
Cc: Praveen Krishnamoorthy <redacted>
Cc: Sreekanth Reddy <redacted>
Cc: Abhijit Mahajan <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Tomi Valkeinen <redacted>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: MPT-FusionLinux.pdl@avagotech.com
Cc: linux-scsi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/message/fusion/mptbase.c | 19 ++++---------------
 drivers/message/fusion/mptbase.h |  2 +-
 2 files changed, 5 insertions(+), 16 deletions(-)
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 187f836..c7b1a55 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -59,10 +59,6 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>		/* needed for in_interrupt() proto */
 #include <linux/dma-mapping.h>
-#include <asm/io.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #include <linux/kthread.h>
 #include <scsi/scsi_host.h>
 
@@ -2820,11 +2816,8 @@ mpt_adapter_dispose(MPT_ADAPTER *ioc)
 	pci_disable_device(ioc->pcidev);
 	pci_release_selected_regions(ioc->pcidev, ioc->bars);
 
-#if defined(CONFIG_MTRR) && 0
-	if (ioc->mtrr_reg > 0) {
-		mtrr_del(ioc->mtrr_reg, 0, 0);
-		dprintk(ioc, printk(MYIOC_s_INFO_FMT "MTRR region de-registered\n", ioc->name));
-	}
+#if 0
+	__arch_phys_wc_del(ioc->wc_cookie);
 #endif
 
 	/*  Zap the adapter lookup ptr!  */
@@ -4512,17 +4505,13 @@ PrimeIocFifos(MPT_ADAPTER *ioc)
 
 		ioc->req_frames_low_dma = (u32) (alloc_dma & 0xFFFFFFFF);
 
-#if defined(CONFIG_MTRR) && 0
+#if 0
 		/*
 		 *  Enable Write Combining MTRR for IOC's memory region.
 		 *  (at least as much as we can; "size and base must be
 		 *  multiples of 4 kiB"
 		 */
-		ioc->mtrr_reg = mtrr_add(ioc->req_frames_dma,
-					 sz,
-					 MTRR_TYPE_WRCOMB, 1);
-		dprintk(ioc, printk(MYIOC_s_DEBUG_FMT "MTRR region registered (base:size=%08x:%x)\n",
-				ioc->name, ioc->req_frames_dma, sz));
+		ioc->wc_cookie = arch_phys_wc_add(ioc->req_frames_dma, sz);
 #endif
 
 		for (i = 0; i < ioc->req_depth; i++) {
diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index 8f14090..f0bff11 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -671,7 +671,7 @@ typedef struct _MPT_ADAPTER
 	u8			*HostPageBuffer; /* SAS - host page buffer support */
 	u32			HostPageBuffer_sz;
 	dma_addr_t		HostPageBuffer_dma;
-	int			 mtrr_reg;
+	int			wc_cookie;
 	struct pci_dev		*pcidev;	/* struct pci_dev pointer */
 	int			bars;		/* bitmask of BAR's that must be configured */
 	int			msi_enable;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 17/47] video: fbdev: vesafb: only support MTRR_TYPE_WRCOMB

From: Luis R. Rodriguez <hidden>
Date: 2015-03-20 23:58:24

From: "Luis R. Rodriguez" <redacted>

No other video driver uses MTRR types except for MTRR_TYPE_WRCOMB,
the other MTRR types were implemented and supported here but with
no real good reason. The ioremap() APIs are architecture agnostic and
at least on x86 PAT is a new design that extends MTRRs and
can replace it in a much cleaner way, where so long as the
proper ioremap_wc() or variant API is used the right thing will
be done behind the scenes. This is the only driver left using the
other MTRR types -- and since there is no good reason for it now
rip them out.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/vesafb.c | 62 ++++++++++++--------------------------------
 1 file changed, 16 insertions(+), 46 deletions(-)
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index d79a0ac..191156b 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -404,60 +404,30 @@ static int vesafb_probe(struct platform_device *dev)
 	 * region already (FIXME) */
 	request_region(0x3c0, 32, "vesafb");
 
+	if (mtrr = 3) {
 #ifdef CONFIG_MTRR
-	if (mtrr) {
 		unsigned int temp_size = size_total;
-		unsigned int type = 0;
+		int rc;
 
-		switch (mtrr) {
-		case 1:
-			type = MTRR_TYPE_UNCACHABLE;
-			break;
-		case 2:
-			type = MTRR_TYPE_WRBACK;
-			break;
-		case 3:
-			type = MTRR_TYPE_WRCOMB;
-			break;
-		case 4:
-			type = MTRR_TYPE_WRTHROUGH;
-			break;
-		default:
-			type = 0;
-			break;
-		}
-
-		if (type) {
-			int rc;
-
-			/* Find the largest power-of-two */
-			temp_size = roundup_pow_of_two(temp_size);
+		/* Find the largest power-of-two */
+		temp_size = roundup_pow_of_two(temp_size);
 
-			/* Try and find a power of two to add */
-			do {
-				rc = mtrr_add(vesafb_fix.smem_start, temp_size,
-					      type, 1);
-				temp_size >>= 1;
-			} while (temp_size >= PAGE_SIZE && rc = -EINVAL);
-		}
-	}
+		/* Try and find a power of two to add */
+		do {
+			rc = mtrr_add(vesafb_fix.smem_start, temp_size,
+				      MTRR_TYPE_WRCOMB, 1);
+			temp_size >>= 1;
+		} while (temp_size >= PAGE_SIZE && rc = -EINVAL);
 #endif
-	
-	switch (mtrr) {
-	case 1: /* uncachable */
-		info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
-		break;
-	case 2: /* write-back */
-		info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
-		break;
-	case 3: /* write-combining */
 		info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
-		break;
-	case 4: /* write-through */
-	default:
+	} else {
+#ifdef CONFIG_MTRR
+		if (mtrr && mtrr != 3)
+			WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
+#endif
 		info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
-		break;
 	}
+
 	if (!info->screen_base) {
 		printk(KERN_ERR
 		       "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 18/47] vidoe: fbdev: vesafb: add missing mtrr_del() for added MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:00:36

From: "Luis R. Rodriguez" <redacted>

The MTRR added was never being deleted.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/vesafb.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index 191156b..a2261d0 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -29,6 +29,10 @@
 
 /* --------------------------------------------------------------------- */
 
+struct vesafb_par {
+	int wc_cookie;
+};
+
 static struct fb_var_screeninfo vesafb_defined = {
 	.activate	= FB_ACTIVATE_NOW,
 	.height		= -1,
@@ -175,7 +179,16 @@ static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 
 static void vesafb_destroy(struct fb_info *info)
 {
+#ifdef CONFIG_MTRR
+	struct vesafb_par *par = info->par;
+#endif
+
 	fb_dealloc_cmap(&info->cmap);
+
+#ifdef CONFIG_MTRR
+	if (par->wc_cookie >= 0)
+		mtrr_del(par->wc_cookie, 0, 0);
+#endif
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
@@ -228,6 +241,7 @@ static int vesafb_setup(char *options)
 static int vesafb_probe(struct platform_device *dev)
 {
 	struct fb_info *info;
+	struct vesafb_par *par;
 	int i, err;
 	unsigned int size_vmode;
 	unsigned int size_remap;
@@ -297,8 +311,8 @@ static int vesafb_probe(struct platform_device *dev)
 		return -ENOMEM;
 	}
 	platform_set_drvdata(dev, info);
-	info->pseudo_palette = info->par;
-	info->par = NULL;
+	info->pseudo_palette = NULL;
+	par = info->par;
 
 	/* set vesafb aperture size for generic probing */
 	info->apertures = alloc_apertures(1);
@@ -407,17 +421,17 @@ static int vesafb_probe(struct platform_device *dev)
 	if (mtrr = 3) {
 #ifdef CONFIG_MTRR
 		unsigned int temp_size = size_total;
-		int rc;
 
 		/* Find the largest power-of-two */
 		temp_size = roundup_pow_of_two(temp_size);
 
 		/* Try and find a power of two to add */
 		do {
-			rc = mtrr_add(vesafb_fix.smem_start, temp_size,
-				      MTRR_TYPE_WRCOMB, 1);
+			par->wc_cookie = mtrr_add(vesafb_fix.smem_start,
+						  temp_size,
+						  MTRR_TYPE_WRCOMB, 1);
 			temp_size >>= 1;
-		} while (temp_size >= PAGE_SIZE && rc = -EINVAL);
+		} while (temp_size >= PAGE_SIZE && par->wc_cookie = -EINVAL);
 #endif
 		info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 	} else {
@@ -462,6 +476,10 @@ static int vesafb_probe(struct platform_device *dev)
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
 	return 0;
 err:
+#ifdef CONFIG_MTRR
+	if (par->wc_cookie >= 0)
+		mtrr_del(par->wc_cookie, 0, 0);
+#endif
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	framebuffer_release(info);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 19/47] video: fbdev: vesafb: use arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:02:49

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap_wc(), if
anything it just uses a smaller size in case MTRR reservation fails.
ioremap_wc() API is already used to take advantage of architecture
write-combining when available.

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/vesafb.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index a2261d0..5bc94d3 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -19,10 +19,9 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/screen_info.h>
+#include <linux/io.h>
 
 #include <video/vga.h>
-#include <asm/io.h>
-#include <asm/mtrr.h>
 
 #define dac_reg	(0x3c8)
 #define dac_val	(0x3c9)
@@ -179,16 +178,10 @@ static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 
 static void vesafb_destroy(struct fb_info *info)
 {
-#ifdef CONFIG_MTRR
 	struct vesafb_par *par = info->par;
-#endif
 
 	fb_dealloc_cmap(&info->cmap);
-
-#ifdef CONFIG_MTRR
-	if (par->wc_cookie >= 0)
-		mtrr_del(par->wc_cookie, 0, 0);
-#endif
+	arch_phys_wc_del(par->wc_cookie);
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
@@ -419,7 +412,6 @@ static int vesafb_probe(struct platform_device *dev)
 	request_region(0x3c0, 32, "vesafb");
 
 	if (mtrr = 3) {
-#ifdef CONFIG_MTRR
 		unsigned int temp_size = size_total;
 
 		/* Find the largest power-of-two */
@@ -427,18 +419,16 @@ static int vesafb_probe(struct platform_device *dev)
 
 		/* Try and find a power of two to add */
 		do {
-			par->wc_cookie = mtrr_add(vesafb_fix.smem_start,
-						  temp_size,
-						  MTRR_TYPE_WRCOMB, 1);
+			par->wc_cookie +				arch_phys_wc_add(vesafb_fix.smem_start,
+						 temp_size);
 			temp_size >>= 1;
-		} while (temp_size >= PAGE_SIZE && par->wc_cookie = -EINVAL);
-#endif
+		} while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
+
 		info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
 	} else {
-#ifdef CONFIG_MTRR
 		if (mtrr && mtrr != 3)
 			WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
-#endif
 		info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 	}
 
@@ -476,10 +466,7 @@ static int vesafb_probe(struct platform_device *dev)
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
 	return 0;
 err:
-#ifdef CONFIG_MTRR
-	if (par->wc_cookie >= 0)
-		mtrr_del(par->wc_cookie, 0, 0);
-#endif
+	arch_phys_wc_del(par->wc_cookie);
 	if (info->screen_base)
 		iounmap(info->screen_base);
 	framebuffer_release(info);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 20/47] mtrr: avoid ifdef'ery with phys_wc_to_mtrr_index()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:05:00

From: "Luis R. Rodriguez" <redacted>

There is only one user but since we're going to bury
MTRR next out of access to drivers expose this last
piece of API to drivers in a general fashion only
needing io.h for access to helpers.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/include/asm/io.h       |  2 ++
 arch/x86/include/asm/mtrr.h     |  5 -----
 arch/x86/kernel/cpu/mtrr/main.c |  6 +++---
 drivers/gpu/drm/drm_ioctl.c     | 14 +-------------
 include/linux/io.h              |  6 ++++++
 5 files changed, 12 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index a144d05..5e3f1f2 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -346,6 +346,8 @@ extern int __must_check arch_phys_wc_add(unsigned long base,
 					 unsigned long size);
 extern void arch_phys_wc_del(int handle);
 #define arch_phys_wc_add arch_phys_wc_add
+extern int arch_phys_wc_index(int handle);
+#define arch_phys_wc_index arch_phys_wc_index
 #endif
 
 #endif /* _ASM_X86_IO_H */
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index cade917..380bb4b 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -49,7 +49,6 @@ extern void mtrr_aps_init(void);
 extern void mtrr_bp_restore(void);
 extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 extern int amd_special_default_mtrr(void);
-extern int phys_wc_to_mtrr_index(int handle);
 #  else
 static const int mtrr_enabled;
 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
@@ -86,10 +85,6 @@ static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
 static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
 {
 }
-static inline int phys_wc_to_mtrr_index(int handle)
-{
-	return -1;
-}
 
 #define mtrr_ap_init() do {} while (0)
 #define mtrr_bp_init() do {} while (0)
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 5ae830b..b68b671 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -607,7 +607,7 @@ void arch_phys_wc_del(int handle)
 EXPORT_SYMBOL(arch_phys_wc_del);
 
 /*
- * phys_wc_to_mtrr_index - translates arch_phys_wc_add's return value
+ * arch_phys_wc_index - translates arch_phys_wc_add's return value
  * @handle: Return value from arch_phys_wc_add
  *
  * This will turn the return value from arch_phys_wc_add into an mtrr
@@ -617,14 +617,14 @@ EXPORT_SYMBOL(arch_phys_wc_del);
  * in printk line.  Alas there is an illegitimate use in some ancient
  * drm ioctls.
  */
-int phys_wc_to_mtrr_index(int handle)
+int arch_phys_wc_index(int handle)
 {
 	if (handle < MTRR_TO_PHYS_WC_OFFSET)
 		return -1;
 	else
 		return handle - MTRR_TO_PHYS_WC_OFFSET;
 }
-EXPORT_SYMBOL_GPL(phys_wc_to_mtrr_index);
+EXPORT_SYMBOL_GPL(arch_phys_wc_index);
 
 /*
  * HACK ALERT!
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index a6d773a..e597cdd 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -36,9 +36,6 @@
 
 #include <linux/pci.h>
 #include <linux/export.h>
-#ifdef CONFIG_X86
-#include <asm/mtrr.h>
-#endif
 
 static int drm_version(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv);
@@ -197,16 +194,7 @@ static int drm_getmap(struct drm_device *dev, void *data,
 	map->type = r_list->map->type;
 	map->flags = r_list->map->flags;
 	map->handle = (void *)(unsigned long) r_list->user_token;
-
-#ifdef CONFIG_X86
-	/*
-	 * There appears to be exactly one user of the mtrr index: dritest.
-	 * It's easy enough to keep it working on non-PAT systems.
-	 */
-	map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
-#else
-	map->mtrr = -1;
-#endif
+	map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 
 	mutex_unlock(&dev->struct_mutex);
 
diff --git a/include/linux/io.h b/include/linux/io.h
index ecc51c3..1676437 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -115,6 +115,12 @@ static inline void arch_phys_wc_del(int handle)
 #define __arch_phys_wc_add arch_phys_wc_add
 #endif
 
+#ifndef arch_phys_wc_index
+static inline int arch_phys_wc_index(int handle)
+{
+	return -1;
+}
+#define arch_phys_wc_index arch_phys_wc_index
 #endif
 
 #endif /* _LINUX_IO_H */
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 21/47] ethernet: myri10ge: use arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:07:13

From: "Luis R. Rodriguez" <redacted>

This driver already uses ioremap_wc() on the same range
so when write-combining is available that will be used
instead.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Hyong-Youb Kim <redacted>
Cc: netdev@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 36 ++++++------------------
 1 file changed, 8 insertions(+), 28 deletions(-)
diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
index 1412f5a..01e4069 100644
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
@@ -69,11 +69,7 @@
 #include <net/ip.h>
 #include <net/tcp.h>
 #include <asm/byteorder.h>
-#include <asm/io.h>
 #include <asm/processor.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #include <net/busy_poll.h>
 
 #include "myri10ge_mcp.h"
@@ -242,8 +238,7 @@ struct myri10ge_priv {
 	unsigned int rdma_tags_available;
 	int intr_coal_delay;
 	__be32 __iomem *intr_coal_delay_ptr;
-	int mtrr;
-	int wc_enabled;
+	int wc_cookie;
 	int down_cnt;
 	wait_queue_head_t down_wq;
 	struct work_struct watchdog_work;
@@ -1984,7 +1979,6 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
 		data[i] = ((u64 *)&link_stats)[i];
 
 	data[i++] = (unsigned int)mgp->tx_boundary;
-	data[i++] = (unsigned int)mgp->wc_enabled;
 	data[i++] = (unsigned int)mgp->pdev->irq;
 	data[i++] = (unsigned int)mgp->msi_enabled;
 	data[i++] = (unsigned int)mgp->msix_enabled;
@@ -4040,14 +4034,7 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	mgp->board_span = pci_resource_len(pdev, 0);
 	mgp->iomem_base = pci_resource_start(pdev, 0);
-	mgp->mtrr = -1;
-	mgp->wc_enabled = 0;
-#ifdef CONFIG_MTRR
-	mgp->mtrr = mtrr_add(mgp->iomem_base, mgp->board_span,
-			     MTRR_TYPE_WRCOMB, 1);
-	if (mgp->mtrr >= 0)
-		mgp->wc_enabled = 1;
-#endif
+	mgp->wc_cookie = arch_phys_wc_add(mgp->iomem_base, mgp->board_span);
 	mgp->sram = ioremap_wc(mgp->iomem_base, mgp->board_span);
 	if (mgp->sram = NULL) {
 		dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
@@ -4146,14 +4133,14 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto abort_with_state;
 	}
 	if (mgp->msix_enabled)
-		dev_info(dev, "%d MSI-X IRQs, tx bndry %d, fw %s, WC %s\n",
+		dev_info(dev, "%d MSI-X IRQs, tx bndry %d, fw %s, MTRR %s, WC Enabled\n",
 			 mgp->num_slices, mgp->tx_boundary, mgp->fw_name,
-			 (mgp->wc_enabled ? "Enabled" : "Disabled"));
+			 (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
 	else
-		dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, WC %s\n",
+		dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, MTRR %s, WC Enabled\n",
 			 mgp->msi_enabled ? "MSI" : "xPIC",
 			 pdev->irq, mgp->tx_boundary, mgp->fw_name,
-			 (mgp->wc_enabled ? "Enabled" : "Disabled"));
+			 (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
 
 	board_number++;
 	return 0;
@@ -4175,10 +4162,7 @@ abort_with_ioremap:
 	iounmap(mgp->sram);
 
 abort_with_mtrr:
-#ifdef CONFIG_MTRR
-	if (mgp->mtrr >= 0)
-		mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
-#endif
+	arch_phys_wc_del(mgp->wc_cookie);
 	dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
 			  mgp->cmd, mgp->cmd_bus);
 
@@ -4220,11 +4204,7 @@ static void myri10ge_remove(struct pci_dev *pdev)
 	pci_restore_state(pdev);
 
 	iounmap(mgp->sram);
-
-#ifdef CONFIG_MTRR
-	if (mgp->mtrr >= 0)
-		mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
-#endif
+	arch_phys_wc_del(mgp->wc_cookie);
 	myri10ge_free_slices(mgp);
 	kfree(mgp->msix_vectors);
 	dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 22/47] staging: sm750fb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:09:24

From: "Luis R. Rodriguez" <redacted>

The same area used for ioremap() is used for the MTRR area.
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/staging/sm750fb/sm750.c    | 34 ++++------------------------------
 drivers/staging/sm750fb/sm750.h    |  3 ---
 drivers/staging/sm750fb/sm750_hw.c |  3 +--
 3 files changed, 5 insertions(+), 35 deletions(-)
diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index aa0888c..ea59471 100644
--- a/drivers/staging/sm750fb/sm750.c
+++ b/drivers/staging/sm750fb/sm750.c
@@ -16,9 +16,6 @@
 #include<linux/vmalloc.h>
 #include<linux/pagemap.h>
 #include <linux/console.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #include <asm/fb.h>
 #include "sm750.h"
 #include "sm750_hw.h"
@@ -47,9 +44,7 @@ typedef int (*PROC_SPEC_INITHW)(struct lynx_share*,struct pci_dev*);
 /* common var for all device */
 static int g_hwcursor = 1;
 static int g_noaccel = 0;
-#ifdef CONFIG_MTRR
 static int g_nomtrr  = 0;
-#endif
 static const char * g_fbmode[] = {NULL,NULL};
 static const char * g_def_fbmode = "800x600-16@60";
 static char * g_settings = NULL;
@@ -1102,11 +1097,8 @@ static int lynxfb_pci_probe(struct pci_dev * pdev,
 
 	pr_info("share->revid = %02x\n",share->revid);
 	share->pdev = pdev;
-#ifdef CONFIG_MTRR
 	share->mtrr_off = g_nomtrr;
 	share->mtrr.vram = 0;
-	share->mtrr.vram_added = 0;
-#endif
 	share->accel_off = g_noaccel;
 	share->dual = g_dualview;
 	spin_lock_init(&share->slock);
@@ -1134,22 +1126,9 @@ static int lynxfb_pci_probe(struct pci_dev * pdev,
 		goto err_map;
 	}
 
-#ifdef CONFIG_MTRR
-	if(!share->mtrr_off){
-		pr_info("enable mtrr\n");
-		share->mtrr.vram = mtrr_add(share->vidmem_start,
-				share->vidmem_size,
-				MTRR_TYPE_WRCOMB,1);
-
-		if(share->mtrr.vram < 0){
-			/* don't block driver with the failure of MTRR */
-			pr_err("Unable to setup MTRR.\n");
-		}else{
-			share->mtrr.vram_added = 1;
-			pr_info("MTRR added succesfully\n");
-		}
-	}
-#endif
+	if (!share->mtrr_off)
+		share->mtrr.vram = arch_phys_wc_add(share->vidmem_start,
+						    share->vidmem_size);
 
 	memset(share->pvMem,0,share->vidmem_size);
 
@@ -1250,10 +1229,7 @@ static void __exit lynxfb_pci_remove(struct pci_dev * pdev)
 		/* release frame buffer*/
 		framebuffer_release(info);
 	}
-#ifdef CONFIG_MTRR
-	if(share->mtrr.vram_added)
-		mtrr_del(share->mtrr.vram,share->vidmem_start,share->vidmem_size);
-#endif
+	arch_phys_wc_del(share->mtrr.vram);
 	//	pci_release_regions(pdev);
 
 	iounmap(share->pvReg);
@@ -1297,10 +1273,8 @@ static int __init lynxfb_setup(char * options)
 		/* options that mean for any lynx chips are configured here */
 		if(!strncmp(opt,"noaccel",strlen("noaccel")))
 			g_noaccel = 1;
-#ifdef CONFIG_MTRR
 		else if(!strncmp(opt,"nomtrr",strlen("nomtrr")))
 			g_nomtrr = 1;
-#endif
 		else if(!strncmp(opt,"dual",strlen("dual")))
 			g_dualview = 1;
 		else
diff --git a/drivers/staging/sm750fb/sm750.h b/drivers/staging/sm750fb/sm750.h
index 0847d2b..5528912 100644
--- a/drivers/staging/sm750fb/sm750.h
+++ b/drivers/staging/sm750fb/sm750.h
@@ -51,13 +51,10 @@ struct lynx_share{
 	struct lynx_accel accel;
 	int accel_off;
 	int dual;
-#ifdef CONFIG_MTRR
 		int mtrr_off;
 		struct{
 			int vram;
-			int vram_added;
 		}mtrr;
-#endif
 	/* all smi graphic adaptor got below attributes */
 	unsigned long vidmem_start;
 	unsigned long vidreg_start;
diff --git a/drivers/staging/sm750fb/sm750_hw.c b/drivers/staging/sm750fb/sm750_hw.c
index c44a50b..203a0a1 100644
--- a/drivers/staging/sm750fb/sm750_hw.c
+++ b/drivers/staging/sm750fb/sm750_hw.c
@@ -85,8 +85,7 @@ int hw_sm750_map(struct lynx_share* share,struct pci_dev* pdev)
 	}
 #endif
 
-	share->pvMem = ioremap(share->vidmem_start,
-							share->vidmem_size);
+	share->pvMem = ioremap_wc(share->vidmem_start, share->vidmem_size);
 
 	if(!share->pvMem){
 		pr_err("Map video memory failed\n");
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 23/47] staging: xgifb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:11:37

From: "Luis R. Rodriguez" <redacted>

The same area used for ioremap() is used for the MTRR area.
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/staging/xgifb/XGI_main_26.c | 27 ++++++---------------------
 1 file changed, 6 insertions(+), 21 deletions(-)
diff --git a/drivers/staging/xgifb/XGI_main_26.c b/drivers/staging/xgifb/XGI_main_26.c
index 74e8820..943d463 100644
--- a/drivers/staging/xgifb/XGI_main_26.c
+++ b/drivers/staging/xgifb/XGI_main_26.c
@@ -8,10 +8,7 @@
 
 #include <linux/sizes.h>
 #include <linux/module.h>
-
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
+#include <linux/pci.h>
 
 #include "XGI_main.h"
 #include "vb_init.h"
@@ -1770,7 +1767,7 @@ static int xgifb_probe(struct pci_dev *pdev,
 	}
 
 	xgifb_info->video_vbase = hw_info->pjVideoMemoryAddress -	ioremap(xgifb_info->video_base, xgifb_info->video_size);
+		ioremap_wc(xgifb_info->video_base, xgifb_info->video_size);
 	xgifb_info->mmio_vbase = ioremap(xgifb_info->mmio_base,
 					    xgifb_info->mmio_size);
 
@@ -2014,12 +2011,8 @@ static int xgifb_probe(struct pci_dev *pdev,
 
 	fb_alloc_cmap(&fb_info->cmap, 256, 0);
 
-#ifdef CONFIG_MTRR
-	xgifb_info->mtrr = mtrr_add(xgifb_info->video_base,
-		xgifb_info->video_size, MTRR_TYPE_WRCOMB, 1);
-	if (xgifb_info->mtrr >= 0)
-		dev_info(&pdev->dev, "Added MTRR\n");
-#endif
+	xgifb_info->mtrr = arch_phys_wc_add(xgifb_info->video_base,
+					    xgifb_info->video_size);
 
 	if (register_framebuffer(fb_info) < 0) {
 		ret = -EINVAL;
@@ -2031,11 +2024,7 @@ static int xgifb_probe(struct pci_dev *pdev,
 	return 0;
 
 error_mtrr:
-#ifdef CONFIG_MTRR
-	if (xgifb_info->mtrr >= 0)
-		mtrr_del(xgifb_info->mtrr, xgifb_info->video_base,
-			xgifb_info->video_size);
-#endif /* CONFIG_MTRR */
+	arch_phys_wc_del(xgifb_info->mtrr);
 error_1:
 	iounmap(xgifb_info->mmio_vbase);
 	iounmap(xgifb_info->video_vbase);
@@ -2059,11 +2048,7 @@ static void xgifb_remove(struct pci_dev *pdev)
 	struct fb_info *fb_info = xgifb_info->fb_info;
 
 	unregister_framebuffer(fb_info);
-#ifdef CONFIG_MTRR
-	if (xgifb_info->mtrr >= 0)
-		mtrr_del(xgifb_info->mtrr, xgifb_info->video_base,
-			xgifb_info->video_size);
-#endif /* CONFIG_MTRR */
+	arch_phys_wc_del(xgifb_info->mtrr);
 	iounmap(xgifb_info->mmio_vbase);
 	iounmap(xgifb_info->video_vbase);
 	release_mem_region(xgifb_info->mmio_base, xgifb_info->mmio_size);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 24/47] video: fbdev: arkfb: use arch_phys_wc_add() and pci_iomap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:13:48

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/arkfb.c | 36 +++++-------------------------------
 1 file changed, 5 insertions(+), 31 deletions(-)
diff --git a/drivers/video/fbdev/arkfb.c b/drivers/video/fbdev/arkfb.c
index b305a1e..6a317de 100644
--- a/drivers/video/fbdev/arkfb.c
+++ b/drivers/video/fbdev/arkfb.c
@@ -26,13 +26,9 @@
 #include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
 #include <video/vga.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 struct arkfb_info {
 	int mclk_freq;
-	int mtrr_reg;
+	int wc_cookie;
 
 	struct dac_info *dac;
 	struct vgastate state;
@@ -102,10 +98,6 @@ static const struct svga_timing_regs ark_timing_regs     = {
 
 static char *mode_option = "640x480-8@60";
 
-#ifdef CONFIG_MTRR
-static int mtrr = 1;
-#endif
-
 MODULE_AUTHOR("(c) 2007 Ondrej Zajicek <santiago@crfreenet.org>");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("fbdev driver for ARK 2000PV");
@@ -115,11 +107,6 @@ MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
 module_param_named(mode, mode_option, charp, 0444);
 MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc) (deprecated)");
 
-#ifdef CONFIG_MTRR
-module_param(mtrr, int, 0444);
-MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
-#endif
-
 static int threshold = 4;
 
 module_param(threshold, int, 0644);
@@ -1002,7 +989,7 @@ static int ark_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	info->fix.smem_len = pci_resource_len(dev, 0);
 
 	/* Map physical IO memory address into kernel space */
-	info->screen_base = pci_iomap(dev, 0, 0);
+	info->screen_base = pci_iomap_wc(dev, 0, 0);
 	if (! info->screen_base) {
 		rc = -ENOMEM;
 		dev_err(info->device, "iomap for framebuffer failed\n");
@@ -1057,14 +1044,8 @@ static int ark_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 
 	/* Record a reference to the driver data */
 	pci_set_drvdata(dev, info);
-
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		par->mtrr_reg = -1;
-		par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
-	}
-#endif
-
+	par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+					  info->fix.smem_len);
 	return 0;
 
 	/* Error handling */
@@ -1092,14 +1073,7 @@ static void ark_pci_remove(struct pci_dev *dev)
 
 	if (info) {
 		struct arkfb_info *par = info->par;
-
-#ifdef CONFIG_MTRR
-		if (par->mtrr_reg >= 0) {
-			mtrr_del(par->mtrr_reg, 0, 0);
-			par->mtrr_reg = -1;
-		}
-#endif
-
+		arch_phys_wc_del(par->wc_cookie);
 		dac_release(par->dac);
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 25/47] video: fbdev: radeonfb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:16:01

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/radeon_base.c | 29 ++++++-----------------------
 drivers/video/fbdev/aty/radeonfb.h    |  2 +-
 2 files changed, 7 insertions(+), 24 deletions(-)
diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
index 26d80a4..922e8fc 100644
--- a/drivers/video/fbdev/aty/radeon_base.c
+++ b/drivers/video/fbdev/aty/radeon_base.c
@@ -85,10 +85,6 @@
 
 #endif /* CONFIG_PPC_OF */
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include <video/radeon.h>
 #include <linux/radeonfb.h>
 
@@ -271,9 +267,7 @@ static bool mirror = 0;
 static int panel_yres = 0;
 static bool force_dfp = 0;
 static bool force_measure_pll = 0;
-#ifdef CONFIG_MTRR
 static bool nomtrr = 0;
-#endif
 static bool force_sleep;
 static bool ignore_devlist;
 #ifdef CONFIG_PMAC_BACKLIGHT
@@ -2260,8 +2254,8 @@ static int radeonfb_pci_register(struct pci_dev *pdev,
 	rinfo->mapped_vram = min_t(unsigned long, MAX_MAPPED_VRAM, rinfo->video_ram);
 
 	do {
-		rinfo->fb_base = ioremap (rinfo->fb_base_phys,
-					  rinfo->mapped_vram);
+		rinfo->fb_base = ioremap_wc(rinfo->fb_base_phys,
+					    rinfo->mapped_vram);
 	} while (rinfo->fb_base = NULL &&
 		 ((rinfo->mapped_vram /= 2) >= MIN_MAPPED_VRAM));
 
@@ -2359,11 +2353,9 @@ static int radeonfb_pci_register(struct pci_dev *pdev,
 		goto err_unmap_fb;
 	}
 
-#ifdef CONFIG_MTRR
-	rinfo->mtrr_hdl = nomtrr ? -1 : mtrr_add(rinfo->fb_base_phys,
-						 rinfo->video_ram,
-						 MTRR_TYPE_WRCOMB, 1);
-#endif
+	if (!nomtrr)
+		rinfo->wc_cookie = arch_phys_wc_add(rinfo->fb_base_phys,
+						    rinfo->video_ram);
 
 	if (backlight)
 		radeonfb_bl_init(rinfo);
@@ -2428,12 +2420,7 @@ static void radeonfb_pci_unregister(struct pci_dev *pdev)
  #endif
 
 	del_timer_sync(&rinfo->lvds_timer);
-
-#ifdef CONFIG_MTRR
-	if (rinfo->mtrr_hdl >= 0)
-		mtrr_del(rinfo->mtrr_hdl, 0, 0);
-#endif
-
+	arch_phys_wc_del(rinfo->wc_cookie);
         unregister_framebuffer(info);
 
         radeonfb_bl_exit(rinfo);
@@ -2489,10 +2476,8 @@ static int __init radeonfb_setup (char *options)
 			panel_yres = simple_strtoul((this_opt+11), NULL, 0);
 		} else if (!strncmp(this_opt, "backlight:", 10)) {
 			backlight = simple_strtoul(this_opt+10, NULL, 0);
-#ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
-#endif
 		} else if (!strncmp(this_opt, "nomodeset", 9)) {
 			nomodeset = 1;
 		} else if (!strncmp(this_opt, "force_measure_pll", 17)) {
@@ -2552,10 +2537,8 @@ module_param(monitor_layout, charp, 0);
 MODULE_PARM_DESC(monitor_layout, "Specify monitor mapping (like XFree86)");
 module_param(force_measure_pll, bool, 0);
 MODULE_PARM_DESC(force_measure_pll, "Force measurement of PLL (debug)");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "bool: disable use of MTRR registers");
-#endif
 module_param(panel_yres, int, 0);
 MODULE_PARM_DESC(panel_yres, "int: set panel yres");
 module_param(mode_option, charp, 0);
diff --git a/drivers/video/fbdev/aty/radeonfb.h b/drivers/video/fbdev/aty/radeonfb.h
index cb84604..61812db 100644
--- a/drivers/video/fbdev/aty/radeonfb.h
+++ b/drivers/video/fbdev/aty/radeonfb.h
@@ -340,7 +340,7 @@ struct radeonfb_info {
 
 	struct pll_info		pll;
 
-	int			mtrr_hdl;
+	int			wc_cookie;
 
 	u32			save_regs[100];
 	int			asleep;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 26/47] video: fbdev: gbefb: add missing mtrr_del() calls

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:18:13

From: "Luis R. Rodriguez" <redacted>

This driver never removed the MTRRs. Fix that.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/gbefb.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index 6d9ef39..f48ea7e 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -38,6 +38,7 @@ static struct sgi_gbe *gbe;
 struct gbefb_par {
 	struct fb_var_screeninfo var;
 	struct gbe_timing_info timing;
+	int wc_cookie;
 	int valid;
 };
 
@@ -1199,7 +1200,8 @@ static int gbefb_probe(struct platform_device *p_dev)
 	}
 
 #ifdef CONFIG_X86
-	mtrr_add(gbe_mem_phys, gbe_mem_size, MTRR_TYPE_WRCOMB, 1);
+	info->wc_cookie = mtrr_add(gbe_mem_phys, gbe_mem_size,
+				   MTRR_TYPE_WRCOMB, 1);
 #endif
 
 	/* map framebuffer memory into tiles table */
@@ -1240,6 +1242,10 @@ static int gbefb_probe(struct platform_device *p_dev)
 	return 0;
 
 out_gbe_unmap:
+#ifdef CONFIG_MTRR
+	if (info->wc_cookie >= 0)
+		mtrr_del(info->wc_cookie, 0, 0);
+#endif
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 out_tiles_free:
@@ -1259,6 +1265,10 @@ static int gbefb_remove(struct platform_device* p_dev)
 
 	unregister_framebuffer(info);
 	gbe_turn_off();
+#ifdef CONFIG_MTRR
+	if (info->wc_cookie >= 0)
+		mtrr_del(info->wc_cookie, 0, 0);
+#endif
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 	dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 27/47] video: fbdev: gbefb: use arch_phys_wc_add() and devm_ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:20:25

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/gbefb.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)
diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c
index f48ea7e..ef81215 100644
--- a/drivers/video/fbdev/gbefb.c
+++ b/drivers/video/fbdev/gbefb.c
@@ -22,9 +22,6 @@
 #include <linux/module.h>
 #include <linux/io.h>
 
-#ifdef CONFIG_X86
-#include <asm/mtrr.h>
-#endif
 #ifdef CONFIG_MIPS
 #include <asm/addrspace.h>
 #endif
@@ -1176,8 +1173,8 @@ static int gbefb_probe(struct platform_device *p_dev)
 
 	if (gbe_mem_phys) {
 		/* memory was allocated at boot time */
-		gbe_mem = devm_ioremap_nocache(&p_dev->dev, gbe_mem_phys,
-					       gbe_mem_size);
+		gbe_mem = devm_ioremap_wc(&p_dev->dev, gbe_mem_phys,
+					  gbe_mem_size);
 		if (!gbe_mem) {
 			printk(KERN_ERR "gbefb: couldn't map framebuffer\n");
 			ret = -ENOMEM;
@@ -1188,8 +1185,8 @@ static int gbefb_probe(struct platform_device *p_dev)
 	} else {
 		/* try to allocate memory with the classical allocator
 		 * this has high chance to fail on low memory machines */
-		gbe_mem = dma_alloc_coherent(NULL, gbe_mem_size, &gbe_dma_addr,
-					     GFP_KERNEL);
+		gbe_mem = dma_alloc_writecombine(NULL, gbe_mem_size,
+						 &gbe_dma_addr, GFP_KERNEL);
 		if (!gbe_mem) {
 			printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n");
 			ret = -ENOMEM;
@@ -1199,10 +1196,7 @@ static int gbefb_probe(struct platform_device *p_dev)
 		gbe_mem_phys = (unsigned long) gbe_dma_addr;
 	}
 
-#ifdef CONFIG_X86
-	info->wc_cookie = mtrr_add(gbe_mem_phys, gbe_mem_size,
-				   MTRR_TYPE_WRCOMB, 1);
-#endif
+	info->wc_cookie = arch_phys_wc_add(gbe_mem_phys, gbe_mem_size);
 
 	/* map framebuffer memory into tiles table */
 	for (i = 0; i < (gbe_mem_size >> TILE_SHIFT); i++)
@@ -1242,10 +1236,7 @@ static int gbefb_probe(struct platform_device *p_dev)
 	return 0;
 
 out_gbe_unmap:
-#ifdef CONFIG_MTRR
-	if (info->wc_cookie >= 0)
-		mtrr_del(info->wc_cookie, 0, 0);
-#endif
+	arch_phys_wc_del(info->wc_cookie);
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 out_tiles_free:
@@ -1265,10 +1256,7 @@ static int gbefb_remove(struct platform_device* p_dev)
 
 	unregister_framebuffer(info);
 	gbe_turn_off();
-#ifdef CONFIG_MTRR
-	if (info->wc_cookie >= 0)
-		mtrr_del(info->wc_cookie, 0, 0);
-#endif
+	arch_phys_wc_del(info->wc_cookie);
 	if (gbe_dma_addr)
 		dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
 	dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 28/47] video: fbdev: intelfb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:22:38

From: "Luis R. Rodriguez" <redacted>

Although this driver gives the framebuffer layer a different
size for the framebuffer it uses the entire aperture PCI BAR
size for the MTRR. Since the framebuffer is included in that
range and MTRR was used on the entire PCI BAR WC will have
been preferred on that range as well. This propagates the
WC preference on the same entire PCI BAR.

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/intelfb/intelfb.h    |  4 +---
 drivers/video/fbdev/intelfb/intelfbdrv.c | 38 ++++----------------------------
 2 files changed, 5 insertions(+), 37 deletions(-)
diff --git a/drivers/video/fbdev/intelfb/intelfb.h b/drivers/video/fbdev/intelfb/intelfb.h
index 6b51175..37f8339 100644
--- a/drivers/video/fbdev/intelfb/intelfb.h
+++ b/drivers/video/fbdev/intelfb/intelfb.h
@@ -285,9 +285,7 @@ struct intelfb_info {
 	/* use a gart reserved fb mem */
 	u8 fbmem_gart;
 
-	/* mtrr support */
-	int mtrr_reg;
-	u32 has_mtrr;
+	int wc_cookie;
 
 	/* heap data */
 	struct intelfb_heap_data aperture;
diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c
index b847d53..bbec737 100644
--- a/drivers/video/fbdev/intelfb/intelfbdrv.c
+++ b/drivers/video/fbdev/intelfb/intelfbdrv.c
@@ -124,10 +124,6 @@
 
 #include <asm/io.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include "intelfb.h"
 #include "intelfbhw.h"
 #include "../edid.h"
@@ -411,33 +407,6 @@ module_init(intelfb_init);
 module_exit(intelfb_exit);
 
 /***************************************************************
- *                     mtrr support functions                  *
- ***************************************************************/
-
-#ifdef CONFIG_MTRR
-static inline void set_mtrr(struct intelfb_info *dinfo)
-{
-	dinfo->mtrr_reg = mtrr_add(dinfo->aperture.physical,
-				   dinfo->aperture.size, MTRR_TYPE_WRCOMB, 1);
-	if (dinfo->mtrr_reg < 0) {
-		ERR_MSG("unable to set MTRR\n");
-		return;
-	}
-	dinfo->has_mtrr = 1;
-}
-static inline void unset_mtrr(struct intelfb_info *dinfo)
-{
-	if (dinfo->has_mtrr)
-		mtrr_del(dinfo->mtrr_reg, dinfo->aperture.physical,
-			 dinfo->aperture.size);
-}
-#else
-#define set_mtrr(x) WRN_MSG("MTRR is disabled in the kernel\n")
-
-#define unset_mtrr(x) do { } while (0)
-#endif /* CONFIG_MTRR */
-
-/***************************************************************
  *                        driver init / cleanup                *
  ***************************************************************/
 
@@ -456,7 +425,7 @@ static void cleanup(struct intelfb_info *dinfo)
 	if (dinfo->registered)
 		unregister_framebuffer(dinfo->info);
 
-	unset_mtrr(dinfo);
+	arch_phys_wc_del(dinfo->wc_cookie);
 
 	if (dinfo->fbmem_gart && dinfo->gtt_fb_mem) {
 		agp_unbind_memory(dinfo->gtt_fb_mem);
@@ -675,7 +644,7 @@ static int intelfb_pci_register(struct pci_dev *pdev,
 	/* Allocate memories (which aren't stolen) */
 	/* Map the fb and MMIO regions */
 	/* ioremap only up to the end of used aperture */
-	dinfo->aperture.virtual = (u8 __iomem *)ioremap_nocache
+	dinfo->aperture.virtual = (u8 __iomem *)ioremap_wc
 		(dinfo->aperture.physical, ((offset + dinfo->fb.offset) << 12)
 		 + dinfo->fb.size);
 	if (!dinfo->aperture.virtual) {
@@ -772,7 +741,8 @@ static int intelfb_pci_register(struct pci_dev *pdev,
 	agp_backend_release(bridge);
 
 	if (mtrr)
-		set_mtrr(dinfo);
+		dinfo->wc_cookie = arch_phys_wc_add(dinfo->aperture.physical,
+						    dinfo->aperture.size);
 
 	DBG_MSG("fb: 0x%x(+ 0x%x)/0x%x (0x%p)\n",
 		dinfo->fb.physical, dinfo->fb.offset, dinfo->fb.size,
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 29/47] video: fbdev: matrox: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:24:49

From: "Luis R. Rodriguez" <redacted>

This driver uses the same ioremap()'d area for the MTRR.
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/matrox/matroxfb_base.c | 36 +++++++++++-------------------
 drivers/video/fbdev/matrox/matroxfb_base.h | 27 +---------------------
 2 files changed, 14 insertions(+), 49 deletions(-)
diff --git a/drivers/video/fbdev/matrox/matroxfb_base.c b/drivers/video/fbdev/matrox/matroxfb_base.c
index 62539ca..2f70365 100644
--- a/drivers/video/fbdev/matrox/matroxfb_base.c
+++ b/drivers/video/fbdev/matrox/matroxfb_base.c
@@ -370,12 +370,9 @@ static void matroxfb_remove(struct matrox_fb_info *minfo, int dummy)
 	matroxfb_unregister_device(minfo);
 	unregister_framebuffer(&minfo->fbcon);
 	matroxfb_g450_shutdown(minfo);
-#ifdef CONFIG_MTRR
-	if (minfo->mtrr.vram_valid)
-		mtrr_del(minfo->mtrr.vram, minfo->video.base, minfo->video.len);
-#endif
-	mga_iounmap(minfo->mmio.vbase);
-	mga_iounmap(minfo->video.vbase);
+	arch_phys_wc_del(minfo->wc_cookie);
+	iounmap(minfo->mmio.vbase.vaddr);
+	iounmap(minfo->video.vbase.vaddr);
 	release_mem_region(minfo->video.base, minfo->video.len_maximum);
 	release_mem_region(minfo->mmio.base, 16384);
 	kfree(minfo);
@@ -1256,9 +1253,7 @@ static int nobios;			/* "matroxfb:nobios" */
 static int noinit = 1;			/* "matroxfb:init" */
 static int inverse;			/* "matroxfb:inverse" */
 static int sgram;			/* "matroxfb:sgram" */
-#ifdef CONFIG_MTRR
 static int mtrr = 1;			/* "matroxfb:nomtrr" */
-#endif
 static int grayscale;			/* "matroxfb:grayscale" */
 static int dev = -1;			/* "matroxfb:dev:xxxxx" */
 static unsigned int vesa = ~0;		/* "matroxfb:vesa:xxxxx" */
@@ -1717,14 +1712,17 @@ static int initMatrox2(struct matrox_fb_info *minfo, struct board *b)
 	if (mem && (mem < memsize))
 		memsize = mem;
 	err = -ENOMEM;
-	if (mga_ioremap(ctrlptr_phys, 16384, MGA_IOREMAP_MMIO, &minfo->mmio.vbase)) {
+
+	minfo->mmio.vbase.vaddr = ioremap_nocache(ctrlptr_phys, 16384);
+	if (!minfo->mmio.vbase.vaddr) {
 		printk(KERN_ERR "matroxfb: cannot ioremap(%lX, 16384), matroxfb disabled\n", ctrlptr_phys);
 		goto failVideoMR;
 	}
 	minfo->mmio.base = ctrlptr_phys;
 	minfo->mmio.len = 16384;
 	minfo->video.base = video_base_phys;
-	if (mga_ioremap(video_base_phys, memsize, MGA_IOREMAP_FB, &minfo->video.vbase)) {
+	minfo->video.vbase.vaddr = ioremap_wc(video_base_phys, memsize);
+	if (!minfo->video.vbase.vaddr) {
 		printk(KERN_ERR "matroxfb: cannot ioremap(%lX, %d), matroxfb disabled\n",
 			video_base_phys, memsize);
 		goto failCtrlIO;
@@ -1772,13 +1770,9 @@ static int initMatrox2(struct matrox_fb_info *minfo, struct board *b)
 	minfo->video.len_usable = minfo->video.len;
 	if (minfo->video.len_usable > b->base->maxdisplayable)
 		minfo->video.len_usable = b->base->maxdisplayable;
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		minfo->mtrr.vram = mtrr_add(video_base_phys, minfo->video.len, MTRR_TYPE_WRCOMB, 1);
-		minfo->mtrr.vram_valid = 1;
-		printk(KERN_INFO "matroxfb: MTRR's turned on\n");
-	}
-#endif	/* CONFIG_MTRR */
+	if (mtrr)
+		minfo->wc_cookie = arch_phys_wc_add(video_base_phys,
+						    minfo->video.len);
 
 	if (!minfo->devflags.novga)
 		request_region(0x3C0, 32, "matrox");
@@ -1947,9 +1941,9 @@ static int initMatrox2(struct matrox_fb_info *minfo, struct board *b)
 	return 0;
 failVideoIO:;
 	matroxfb_g450_shutdown(minfo);
-	mga_iounmap(minfo->video.vbase);
+	iounmap(minfo->video.vbase.vaddr);
 failCtrlIO:;
-	mga_iounmap(minfo->mmio.vbase);
+	iounmap(minfo->mmio.vbase.vaddr);
 failVideoMR:;
 	release_mem_region(video_base_phys, minfo->video.len_maximum);
 failCtrlMR:;
@@ -2443,10 +2437,8 @@ static int __init matroxfb_setup(char *options) {
 				nobios = !value;
 			else if (!strcmp(this_opt, "init"))
 				noinit = !value;
-#ifdef CONFIG_MTRR
 			else if (!strcmp(this_opt, "mtrr"))
 				mtrr = value;
-#endif
 			else if (!strcmp(this_opt, "inv24"))
 				inv24 = value;
 			else if (!strcmp(this_opt, "cross4MB"))
@@ -2515,10 +2507,8 @@ module_param(noinit, int, 0);
 MODULE_PARM_DESC(noinit, "Disables W/SG/SD-RAM and bus interface initialization (0 or 1=do not initialize) (default=0)");
 module_param(memtype, int, 0);
 MODULE_PARM_DESC(memtype, "Memory type for G200/G400 (see Documentation/fb/matroxfb.txt for explanation) (default=3 for G200, 0 for G400)");
-#ifdef CONFIG_MTRR
 module_param(mtrr, int, 0);
 MODULE_PARM_DESC(mtrr, "This speeds up video memory accesses (0=disabled or 1) (default=1)");
-#endif
 module_param(sgram, int, 0);
 MODULE_PARM_DESC(sgram, "Indicates that G100/G200/G400 has SGRAM memory (0=SDRAM, 1=SGRAM) (default=0)");
 module_param(inv24, int, 0);
diff --git a/drivers/video/fbdev/matrox/matroxfb_base.h b/drivers/video/fbdev/matrox/matroxfb_base.h
index 89a8a89a..09b02cd 100644
--- a/drivers/video/fbdev/matrox/matroxfb_base.h
+++ b/drivers/video/fbdev/matrox/matroxfb_base.h
@@ -44,9 +44,6 @@
 
 #include <asm/io.h>
 #include <asm/unaligned.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 
 #if defined(CONFIG_PPC_PMAC)
 #include <asm/prom.h>
@@ -187,23 +184,6 @@ static inline void __iomem* vaddr_va(vaddr_t va) {
 	return va.vaddr;
 }
 
-#define MGA_IOREMAP_NORMAL	0
-#define MGA_IOREMAP_NOCACHE	1
-
-#define MGA_IOREMAP_FB		MGA_IOREMAP_NOCACHE
-#define MGA_IOREMAP_MMIO	MGA_IOREMAP_NOCACHE
-static inline int mga_ioremap(unsigned long phys, unsigned long size, int flags, vaddr_t* virt) {
-	if (flags & MGA_IOREMAP_NOCACHE)
-		virt->vaddr = ioremap_nocache(phys, size);
-	else
-		virt->vaddr = ioremap(phys, size);
-	return (virt->vaddr = NULL); /* 0, !0... 0, error_code in future */
-}
-
-static inline void mga_iounmap(vaddr_t va) {
-	iounmap(va.vaddr);
-}
-
 struct my_timming {
 	unsigned int pixclock;
 	int mnp;
@@ -449,12 +429,7 @@ struct matrox_fb_info {
 		int		plnwt;
 		int		srcorg;
 			      } capable;
-#ifdef CONFIG_MTRR
-	struct {
-		int		vram;
-		int		vram_valid;
-			      } mtrr;
-#endif
+	int			wc_cookie;
 	struct {
 		int		precise_width;
 		int		mga_24bpp_fix;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 30/47] video: fbdev: neofb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:27:01

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/neofb.c | 26 +++++++-------------------
 include/video/neomagic.h    |  5 +----
 2 files changed, 8 insertions(+), 23 deletions(-)
diff --git a/drivers/video/fbdev/neofb.c b/drivers/video/fbdev/neofb.c
index 44f99a6..db023a9 100644
--- a/drivers/video/fbdev/neofb.c
+++ b/drivers/video/fbdev/neofb.c
@@ -71,11 +71,6 @@
 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/pgtable.h>
-
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include <video/vga.h>
 #include <video/neomagic.h>
 
@@ -1710,6 +1705,7 @@ static int neo_map_video(struct fb_info *info, struct pci_dev *dev,
 			 int video_len)
 {
 	//unsigned long addr;
+	struct neofb_par *par = info->par;
 
 	DBG("neo_map_video");
 
@@ -1723,7 +1719,7 @@ static int neo_map_video(struct fb_info *info, struct pci_dev *dev,
 	}
 
 	info->screen_base -	    ioremap(info->fix.smem_start, info->fix.smem_len);
+	    ioremap_wc(info->fix.smem_start, info->fix.smem_len);
 	if (!info->screen_base) {
 		printk("neofb: unable to map screen memory\n");
 		release_mem_region(info->fix.smem_start,
@@ -1733,11 +1729,8 @@ static int neo_map_video(struct fb_info *info, struct pci_dev *dev,
 		printk(KERN_INFO "neofb: mapped framebuffer at %p\n",
 		       info->screen_base);
 
-#ifdef CONFIG_MTRR
-	((struct neofb_par *)(info->par))->mtrr -		mtrr_add(info->fix.smem_start, pci_resource_len(dev, 0),
-				MTRR_TYPE_WRCOMB, 1);
-#endif
+	par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+					  pci_resource_len(dev, 0));
 
 	/* Clear framebuffer, it's all white in memory after boot */
 	memset_io(info->screen_base, 0, info->fix.smem_len);
@@ -1754,16 +1747,11 @@ static int neo_map_video(struct fb_info *info, struct pci_dev *dev,
 
 static void neo_unmap_video(struct fb_info *info)
 {
-	DBG("neo_unmap_video");
+	struct neofb_par *par = info->par;
 
-#ifdef CONFIG_MTRR
-	{
-		struct neofb_par *par = info->par;
+	DBG("neo_unmap_video");
 
-		mtrr_del(par->mtrr, info->fix.smem_start,
-			 info->fix.smem_len);
-	}
-#endif
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(info->screen_base);
 	info->screen_base = NULL;
 
diff --git a/include/video/neomagic.h b/include/video/neomagic.h
index bc5013e..91e225a 100644
--- a/include/video/neomagic.h
+++ b/include/video/neomagic.h
@@ -159,10 +159,7 @@ struct neofb_par {
 	unsigned char VCLK3NumeratorHigh;
 	unsigned char VCLK3Denominator;
 	unsigned char VerticalExt;
-
-#ifdef CONFIG_MTRR
-	int mtrr;
-#endif
+	int wc_cookie;
 	u8 __iomem *mmio_vbase;
 	u8 cursorOff;
 	u8 *cursorPad;		/* Must die !! */
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 31/47] video: fbdev: s3fb: use arch_phys_wc_add() and pci_iomap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:29:14

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/s3fb.c | 35 ++++++-----------------------------
 1 file changed, 6 insertions(+), 29 deletions(-)
diff --git a/drivers/video/fbdev/s3fb.c b/drivers/video/fbdev/s3fb.c
index f0ae61a..13b1090 100644
--- a/drivers/video/fbdev/s3fb.c
+++ b/drivers/video/fbdev/s3fb.c
@@ -28,13 +28,9 @@
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 struct s3fb_info {
 	int chip, rev, mclk_freq;
-	int mtrr_reg;
+	int wc_cookie;
 	struct vgastate state;
 	struct mutex open_lock;
 	unsigned int ref_count;
@@ -154,11 +150,7 @@ static const struct svga_timing_regs s3_timing_regs     = {
 
 
 static char *mode_option;
-
-#ifdef CONFIG_MTRR
 static int mtrr = 1;
-#endif
-
 static int fasttext = 1;
 
 
@@ -170,11 +162,8 @@ module_param(mode_option, charp, 0444);
 MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
 module_param_named(mode, mode_option, charp, 0444);
 MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc) (deprecated)");
-
-#ifdef CONFIG_MTRR
 module_param(mtrr, int, 0444);
 MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
-#endif
 
 module_param(fasttext, int, 0644);
 MODULE_PARM_DESC(fasttext, "Enable S3 fast text mode (1=enable, 0=disable, default=1)");
@@ -1168,7 +1157,7 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	info->fix.smem_len = pci_resource_len(dev, 0);
 
 	/* Map physical IO memory address into kernel space */
-	info->screen_base = pci_iomap(dev, 0, 0);
+	info->screen_base = pci_iomap_wc(dev, 0, 0);
 	if (! info->screen_base) {
 		rc = -ENOMEM;
 		dev_err(info->device, "iomap for framebuffer failed\n");
@@ -1365,12 +1354,9 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	/* Record a reference to the driver data */
 	pci_set_drvdata(dev, info);
 
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		par->mtrr_reg = -1;
-		par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
-	}
-#endif
+	if (mtrr)
+		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+						  info->fix.smem_len);
 
 	return 0;
 
@@ -1405,14 +1391,7 @@ static void s3_pci_remove(struct pci_dev *dev)
 
 	if (info) {
 		par = info->par;
-
-#ifdef CONFIG_MTRR
-		if (par->mtrr_reg >= 0) {
-			mtrr_del(par->mtrr_reg, 0, 0);
-			par->mtrr_reg = -1;
-		}
-#endif
-
+		arch_phys_wc_del(par->wc_cookie);
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
 
@@ -1551,10 +1530,8 @@ static int  __init s3fb_setup(char *options)
 
 		if (!*opt)
 			continue;
-#ifdef CONFIG_MTRR
 		else if (!strncmp(opt, "mtrr:", 5))
 			mtrr = simple_strtoul(opt + 5, NULL, 0);
-#endif
 		else if (!strncmp(opt, "fasttext:", 9))
 			fasttext = simple_strtoul(opt + 9, NULL, 0);
 		else
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 32/47] video: fbdev: nvidia: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:31:26

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR and ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/nvidia/nv_type.h |  7 +------
 drivers/video/fbdev/nvidia/nvidia.c  | 37 ++++++------------------------------
 2 files changed, 7 insertions(+), 37 deletions(-)
diff --git a/drivers/video/fbdev/nvidia/nv_type.h b/drivers/video/fbdev/nvidia/nv_type.h
index c03f7f5..6ff321a 100644
--- a/drivers/video/fbdev/nvidia/nv_type.h
+++ b/drivers/video/fbdev/nvidia/nv_type.h
@@ -148,12 +148,7 @@ struct nvidia_par {
 	u32 forceCRTC;
 	u32 open_count;
 	u8 DDCBase;
-#ifdef CONFIG_MTRR
-	struct {
-		int vram;
-		int vram_valid;
-	} mtrr;
-#endif
+	int wc_cookie;
 	struct nvidia_i2c_chan chan[3];
 
 	volatile u32 __iomem *REGS;
diff --git a/drivers/video/fbdev/nvidia/nvidia.c b/drivers/video/fbdev/nvidia/nvidia.c
index def0412..781f5e7 100644
--- a/drivers/video/fbdev/nvidia/nvidia.c
+++ b/drivers/video/fbdev/nvidia/nvidia.c
@@ -21,9 +21,6 @@
 #include <linux/pci.h>
 #include <linux/console.h>
 #include <linux/backlight.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #ifdef CONFIG_PPC_OF
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
@@ -80,9 +77,7 @@ static int paneltweak = 0;
 static int vram = 0;
 static int bpp = 8;
 static int reverse_i2c;
-#ifdef CONFIG_MTRR
 static bool nomtrr = false;
-#endif
 #ifdef CONFIG_PMAC_BACKLIGHT
 static int backlight = 1;
 #else
@@ -1365,7 +1360,8 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
 	par->ScratchBufferStart = par->FbUsableSize - par->ScratchBufferSize;
 	par->CursorStart = par->FbUsableSize + (32 * 1024);
 
-	info->screen_base = ioremap(nvidiafb_fix.smem_start, par->FbMapSize);
+	info->screen_base = ioremap_wc(nvidiafb_fix.smem_start,
+				       par->FbMapSize);
 	info->screen_size = par->FbUsableSize;
 	nvidiafb_fix.smem_len = par->RamAmountKBytes * 1024;
 
@@ -1376,20 +1372,9 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
 
 	par->FbStart = info->screen_base;
 
-#ifdef CONFIG_MTRR
-	if (!nomtrr) {
-		par->mtrr.vram = mtrr_add(nvidiafb_fix.smem_start,
-					  par->RamAmountKBytes * 1024,
-					  MTRR_TYPE_WRCOMB, 1);
-		if (par->mtrr.vram < 0) {
-			printk(KERN_ERR PFX "unable to setup MTRR\n");
-		} else {
-			par->mtrr.vram_valid = 1;
-			/* let there be speed */
-			printk(KERN_INFO PFX "MTRR set to ON\n");
-		}
-	}
-#endif				/* CONFIG_MTRR */
+	if (!nomtrr)
+		par->wc_cookie = arch_phys_wc_add(nvidiafb_fix.smem_start,
+						  par->RamAmountKBytes * 1024);
 
 	info->fbops = &nvidia_fb_ops;
 	info->fix = nvidiafb_fix;
@@ -1447,13 +1432,7 @@ static void nvidiafb_remove(struct pci_dev *pd)
 	unregister_framebuffer(info);
 
 	nvidia_bl_exit(par);
-
-#ifdef CONFIG_MTRR
-	if (par->mtrr.vram_valid)
-		mtrr_del(par->mtrr.vram, info->fix.smem_start,
-			 info->fix.smem_len);
-#endif				/* CONFIG_MTRR */
-
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(info->screen_base);
 	fb_destroy_modedb(info->monspecs.modedb);
 	nvidia_delete_i2c_busses(par);
@@ -1505,10 +1484,8 @@ static int nvidiafb_setup(char *options)
 			vram = simple_strtoul(this_opt+5, NULL, 0);
 		} else if (!strncmp(this_opt, "backlight:", 10)) {
 			backlight = simple_strtoul(this_opt+10, NULL, 0);
-#ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = true;
-#endif
 		} else if (!strncmp(this_opt, "fpdither:", 9)) {
 			fpdither = simple_strtol(this_opt+9, NULL, 0);
 		} else if (!strncmp(this_opt, "bpp:", 4)) {
@@ -1596,11 +1573,9 @@ MODULE_PARM_DESC(bpp, "pixel width in bits"
 		 "(default=8)");
 module_param(reverse_i2c, int, 0);
 MODULE_PARM_DESC(reverse_i2c, "reverse port assignment of the i2c bus");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, false);
 MODULE_PARM_DESC(nomtrr, "Disables MTRR support (0 or 1=disabled) "
 		 "(default=0)");
-#endif
 
 MODULE_AUTHOR("Antonino Daplas");
 MODULE_DESCRIPTION("Framebuffer driver for nVidia graphics chipset");
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 33/47] video: fbdev: savagefb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:33:38

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/savage/savagefb.h        |  4 +---
 drivers/video/fbdev/savage/savagefb_driver.c | 17 +++--------------
 2 files changed, 4 insertions(+), 17 deletions(-)
diff --git a/drivers/video/fbdev/savage/savagefb.h b/drivers/video/fbdev/savage/savagefb.h
index 8ff4ab1..aba04af 100644
--- a/drivers/video/fbdev/savage/savagefb.h
+++ b/drivers/video/fbdev/savage/savagefb.h
@@ -213,9 +213,7 @@ struct savagefb_par {
 		void   __iomem *vbase;
 		u32    pbase;
 		u32    len;
-#ifdef CONFIG_MTRR
-		int    mtrr;
-#endif
+		int    wc_cookie;
 	} video;
 
 	struct {
diff --git a/drivers/video/fbdev/savage/savagefb_driver.c b/drivers/video/fbdev/savage/savagefb_driver.c
index 4dbf45f..6c77ab0 100644
--- a/drivers/video/fbdev/savage/savagefb_driver.c
+++ b/drivers/video/fbdev/savage/savagefb_driver.c
@@ -57,10 +57,6 @@
 #include <asm/irq.h>
 #include <asm/pgtable.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include "savagefb.h"
 
 
@@ -1775,7 +1771,7 @@ static int savage_map_video(struct fb_info *info, int video_len)
 
 	par->video.pbase = pci_resource_start(par->pcidev, resource);
 	par->video.len   = video_len;
-	par->video.vbase = ioremap(par->video.pbase, par->video.len);
+	par->video.vbase = ioremap_wc(par->video.pbase, par->video.len);
 
 	if (!par->video.vbase) {
 		printk("savagefb: unable to map screen memory\n");
@@ -1787,11 +1783,7 @@ static int savage_map_video(struct fb_info *info, int video_len)
 	info->fix.smem_start = par->video.pbase;
 	info->fix.smem_len   = par->video.len - par->cob_size;
 	info->screen_base    = par->video.vbase;
-
-#ifdef CONFIG_MTRR
-	par->video.mtrr = mtrr_add(par->video.pbase, video_len,
-				   MTRR_TYPE_WRCOMB, 1);
-#endif
+	par->video.wc_cookie = arch_phys_wc_add(par->video.pbase, video_len);
 
 	/* Clear framebuffer, it's all white in memory after boot */
 	memset_io(par->video.vbase, 0, par->video.len);
@@ -1806,10 +1798,7 @@ static void savage_unmap_video(struct fb_info *info)
 	DBG("savage_unmap_video");
 
 	if (par->video.vbase) {
-#ifdef CONFIG_MTRR
-		mtrr_del(par->video.mtrr, par->video.pbase, par->video.len);
-#endif
-
+		arch_phys_wc_del(par->video.wc_cookie);
 		iounmap(par->video.vbase);
 		par->video.vbase = NULL;
 		info->screen_base = NULL;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 34/47] video: fbdev: sisfb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:35:50

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/sis/sis.h      |  2 +-
 drivers/video/fbdev/sis/sis_main.c | 27 ++++++---------------------
 2 files changed, 7 insertions(+), 22 deletions(-)
diff --git a/drivers/video/fbdev/sis/sis.h b/drivers/video/fbdev/sis/sis.h
index 1987f1b7..ea1d1c9 100644
--- a/drivers/video/fbdev/sis/sis.h
+++ b/drivers/video/fbdev/sis/sis.h
@@ -458,7 +458,7 @@ struct sis_video_info {
 
 	unsigned char	*bios_abase;
 
-	int		mtrr;
+	int		wc_cookie;
 
 	u32		sisfb_mem;
 
diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
index fcf610e..e923038 100644
--- a/drivers/video/fbdev/sis/sis_main.c
+++ b/drivers/video/fbdev/sis/sis_main.c
@@ -53,9 +53,6 @@
 #include <linux/types.h>
 #include <linux/uaccess.h>
 #include <asm/io.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 
 #include "sis.h"
 #include "sis_main.h"
@@ -4130,13 +4127,13 @@ static void sisfb_post_map_vram(struct sis_video_info *ivideo,
 	if (*mapsize < (min << 20))
 		return;
 
-	ivideo->video_vbase = ioremap(ivideo->video_base, (*mapsize));
+	ivideo->video_vbase = ioremap_wc(ivideo->video_base, (*mapsize));
 
 	if(!ivideo->video_vbase) {
 		printk(KERN_ERR
 			"sisfb: Unable to map maximum video RAM for size detection\n");
 		(*mapsize) >>= 1;
-		while((!(ivideo->video_vbase = ioremap(ivideo->video_base, (*mapsize))))) {
+		while((!(ivideo->video_vbase = ioremap_wc(ivideo->video_base, (*mapsize))))) {
 			(*mapsize) >>= 1;
 			if((*mapsize) < (min << 20))
 				break;
@@ -6186,7 +6183,7 @@ static int sisfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto error_2;
 	}
 
-	ivideo->video_vbase = ioremap(ivideo->video_base, ivideo->video_size);
+	ivideo->video_vbase = ioremap_wc(ivideo->video_base, ivideo->video_size);
 	ivideo->SiS_Pr.VideoMemoryAddress = ivideo->video_vbase;
 	if(!ivideo->video_vbase) {
 		printk(KERN_ERR "sisfb: Fatal error: Unable to map framebuffer memory\n");
@@ -6254,8 +6251,6 @@ error_3:	vfree(ivideo->bios_abase);
 	ivideo->SiS_Pr.VideoMemoryAddress += ivideo->video_offset;
 	ivideo->SiS_Pr.VideoMemorySize = ivideo->sisfb_mem;
 
-	ivideo->mtrr = -1;
-
 	ivideo->vbflags = 0;
 	ivideo->lcddefmodeidx = DEFAULT_LCDMODE;
 	ivideo->tvdefmodeidx  = DEFAULT_TVMODE;
@@ -6443,14 +6438,8 @@ error_3:	vfree(ivideo->bios_abase);
 
 		printk(KERN_DEBUG "sisfb: Initial vbflags 0x%x\n", (int)ivideo->vbflags);
 
-#ifdef CONFIG_MTRR
-		ivideo->mtrr = mtrr_add(ivideo->video_base, ivideo->video_size,
-					MTRR_TYPE_WRCOMB, 1);
-		if(ivideo->mtrr < 0) {
-			printk(KERN_DEBUG "sisfb: Failed to add MTRRs\n");
-		}
-#endif
-
+		ivideo->wc_cookie = arch_phys_wc_add(ivideo->video_base,
+						     ivideo->video_size);
 		if(register_framebuffer(sis_fb_info) < 0) {
 			printk(KERN_ERR "sisfb: Fatal error: Failed to register framebuffer\n");
 			ret = -EINVAL;
@@ -6507,11 +6496,7 @@ static void sisfb_remove(struct pci_dev *pdev)
 
 	pci_dev_put(ivideo->nbridge);
 
-#ifdef CONFIG_MTRR
-	/* Release MTRR region */
-	if(ivideo->mtrr >= 0)
-		mtrr_del(ivideo->mtrr, ivideo->video_base, ivideo->video_size);
-#endif
+	arch_phys_wc_del(ivideo->wc_cookie);
 
 	/* If device was disabled when starting, disable
 	 * it when quitting.
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 35/47] video: fbdev: aty: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:38:03

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/aty/aty128fb.c | 36 ++++++------------------------------
 1 file changed, 6 insertions(+), 30 deletions(-)
diff --git a/drivers/video/fbdev/aty/aty128fb.c b/drivers/video/fbdev/aty/aty128fb.c
index aedf2fb..f41955b 100644
--- a/drivers/video/fbdev/aty/aty128fb.c
+++ b/drivers/video/fbdev/aty/aty128fb.c
@@ -80,10 +80,6 @@
 #include <asm/btext.h>
 #endif /* CONFIG_BOOTX_TEXT */
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include <video/aty128.h>
 
 /* Debug flag */
@@ -399,10 +395,7 @@ static int default_cmode = CMODE_8;
 
 static int default_crt_on = 0;
 static int default_lcd_on = 1;
-
-#ifdef CONFIG_MTRR
 static bool mtrr = true;
-#endif
 
 #ifdef CONFIG_FB_ATY128_BACKLIGHT
 #ifdef CONFIG_PMAC_BACKLIGHT
@@ -456,9 +449,7 @@ struct aty128fb_par {
 	u32 vram_size;                      /* onboard video ram   */
 	int chip_gen;
 	const struct aty128_meminfo *mem;   /* onboard mem info    */
-#ifdef CONFIG_MTRR
-	struct { int vram; int vram_valid; } mtrr;
-#endif
+	int wc_cookie;
 	int blitter_may_be_busy;
 	int fifo_slots;                 /* free slots in FIFO (64 max) */
 
@@ -1725,12 +1716,10 @@ static int aty128fb_setup(char *options)
 #endif
 			continue;
 		}
-#ifdef CONFIG_MTRR
 		if(!strncmp(this_opt, "nomtrr", 6)) {
 			mtrr = 0;
 			continue;
 		}
-#endif
 #ifdef CONFIG_PPC_PMAC
 		/* vmode and cmode deprecated */
 		if (!strncmp(this_opt, "vmode:", 6)) {
@@ -2133,7 +2122,7 @@ static int aty128_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	par->vram_size = aty_ld_le32(CNFG_MEMSIZE) & 0x03FFFFFF;
 
 	/* Virtualize the framebuffer */
-	info->screen_base = ioremap(fb_addr, par->vram_size);
+	info->screen_base = ioremap_wc(fb_addr, par->vram_size);
 	if (!info->screen_base)
 		goto err_unmap_out;
 
@@ -2170,15 +2159,9 @@ static int aty128_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (!aty128_init(pdev, ent))
 		goto err_out;
 
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		par->mtrr.vram = mtrr_add(info->fix.smem_start,
-				par->vram_size, MTRR_TYPE_WRCOMB, 1);
-		par->mtrr.vram_valid = 1;
-		/* let there be speed */
-		printk(KERN_INFO "aty128fb: Rage128 MTRR set to ON\n");
-	}
-#endif /* CONFIG_MTRR */
+	if (mtrr)
+		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+						  par->vram_size);
 	return 0;
 
 err_out:
@@ -2212,11 +2195,7 @@ static void aty128_remove(struct pci_dev *pdev)
 	aty128_bl_exit(info->bl_dev);
 #endif
 
-#ifdef CONFIG_MTRR
-	if (par->mtrr.vram_valid)
-		mtrr_del(par->mtrr.vram, info->fix.smem_start,
-			 par->vram_size);
-#endif /* CONFIG_MTRR */
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(par->regbase);
 	iounmap(info->screen_base);
 
@@ -2625,8 +2604,5 @@ MODULE_DESCRIPTION("FBDev driver for ATI Rage128 / Pro cards");
 MODULE_LICENSE("GPL");
 module_param(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
-#ifdef CONFIG_MTRR
 module_param_named(nomtrr, mtrr, invbool, 0);
 MODULE_PARM_DESC(nomtrr, "bool: Disable MTRR support (0 or 1=disabled) (default=0)");
-#endif
-
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 36/47] video: fbdev: i810: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:40:14

From: "Luis R. Rodriguez" <redacted>

The same area used for MTRR is used for the ioremap() area.
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/i810/i810.h      |  3 +--
 drivers/video/fbdev/i810/i810_main.c | 11 +++++++----
 drivers/video/fbdev/i810/i810_main.h | 26 --------------------------
 3 files changed, 8 insertions(+), 32 deletions(-)
diff --git a/drivers/video/fbdev/i810/i810.h b/drivers/video/fbdev/i810/i810.h
index 1414b73..7b1c002 100644
--- a/drivers/video/fbdev/i810/i810.h
+++ b/drivers/video/fbdev/i810/i810.h
@@ -199,7 +199,6 @@
 #define HAS_FONTCACHE               8 
 
 /* driver flags */
-#define HAS_MTRR                    1
 #define HAS_ACCELERATION            2
 #define ALWAYS_SYNC                 4
 #define LOCKUP                      8
@@ -281,7 +280,7 @@ struct i810fb_par {
 	u32 ovract;
 	u32 cur_state;
 	u32 ddc_num;
-	int mtrr_reg;
+	int wc_cookie;
 	u16 bltcntl;
 	u8 interlace;
 };
diff --git a/drivers/video/fbdev/i810/i810_main.c b/drivers/video/fbdev/i810/i810_main.c
index bb674e4..025b882 100644
--- a/drivers/video/fbdev/i810/i810_main.c
+++ b/drivers/video/fbdev/i810/i810_main.c
@@ -41,6 +41,7 @@
 #include <linux/resource.h>
 #include <linux/unistd.h>
 #include <linux/console.h>
+#include <linux/io.h>
 
 #include <asm/io.h>
 #include <asm/div64.h>
@@ -1816,7 +1817,9 @@ static void i810_init_device(struct i810fb_par *par)
 	u8 reg;
 	u8 __iomem *mmio = par->mmio_start_virtual;
 
-	if (mtrr) set_mtrr(par);
+	if (mtrr)
+		par->wc_cookie= arch_phys_wc_add((u32) par->aperture.physical,
+						 par->aperture.size);
 
 	i810_init_cursor(par);
 
@@ -1865,8 +1868,8 @@ static int i810_allocate_pci_resource(struct i810fb_par *par,
 	}
 	par->res_flags |= FRAMEBUFFER_REQ;
 
-	par->aperture.virtual = ioremap_nocache(par->aperture.physical, 
-					par->aperture.size);
+	par->aperture.virtual = ioremap_wc(par->aperture.physical,
+					   par->aperture.size);
 	if (!par->aperture.virtual) {
 		printk("i810fb_init: cannot remap framebuffer region\n");
 		return -ENODEV;
@@ -2096,7 +2099,7 @@ static void i810fb_release_resource(struct fb_info *info,
 				    struct i810fb_par *par)
 {
 	struct gtt_data *gtt = &par->i810_gtt;
-	unset_mtrr(par);
+	arch_phys_wc_del(par->wc_cookie);
 
 	i810_delete_i2c_busses(par);
 
diff --git a/drivers/video/fbdev/i810/i810_main.h b/drivers/video/fbdev/i810/i810_main.h
index a25afaa..7bfaaad 100644
--- a/drivers/video/fbdev/i810/i810_main.h
+++ b/drivers/video/fbdev/i810/i810_main.h
@@ -60,32 +60,6 @@ static inline void flush_cache(void)
 #define flush_cache() do { } while(0)
 #endif 
 
-#ifdef CONFIG_MTRR
-
-#include <asm/mtrr.h>
-
-static inline void set_mtrr(struct i810fb_par *par)
-{
-	par->mtrr_reg = mtrr_add((u32) par->aperture.physical, 
-		 par->aperture.size, MTRR_TYPE_WRCOMB, 1);
-	if (par->mtrr_reg < 0) {
-		printk(KERN_ERR "set_mtrr: unable to set MTRR\n");
-		return;
-	}
-	par->dev_flags |= HAS_MTRR;
-}
-static inline void unset_mtrr(struct i810fb_par *par)
-{
-  	if (par->dev_flags & HAS_MTRR) 
-  		mtrr_del(par->mtrr_reg, (u32) par->aperture.physical, 
-			 par->aperture.size); 
-}
-#else
-#define set_mtrr(x) printk("set_mtrr: MTRR is disabled in the kernel\n")
-
-#define unset_mtrr(x) do { } while (0)
-#endif /* CONFIG_MTRR */
-
 #ifdef CONFIG_FB_I810_GTF
 #define IS_DVT (0)
 #else
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 37/47] video: fbdev: i740fb: use arch_phys_wc_add() and pci_ioremap_wc_bar()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:42:26

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/i740fb.c | 35 ++++++-----------------------------
 1 file changed, 6 insertions(+), 29 deletions(-)
diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c
index a2b4204..452e116 100644
--- a/drivers/video/fbdev/i740fb.c
+++ b/drivers/video/fbdev/i740fb.c
@@ -27,24 +27,15 @@
 #include <linux/console.h>
 #include <video/vga.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include "i740_reg.h"
 
 static char *mode_option;
-
-#ifdef CONFIG_MTRR
 static int mtrr = 1;
-#endif
 
 struct i740fb_par {
 	unsigned char __iomem *regs;
 	bool has_sgram;
-#ifdef CONFIG_MTRR
-	int mtrr_reg;
-#endif
+	int wc_cookie;
 	bool ddc_registered;
 	struct i2c_adapter ddc_adapter;
 	struct i2c_algo_bit_data ddc_algo;
@@ -1040,7 +1031,7 @@ static int i740fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 		goto err_request_regions;
 	}
 
-	info->screen_base = pci_ioremap_bar(dev, 0);
+	info->screen_base = pci_ioremap_wc_bar(dev, 0);
 	if (!info->screen_base) {
 		dev_err(info->device, "error remapping base\n");
 		ret = -ENOMEM;
@@ -1144,13 +1135,9 @@ static int i740fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
 	pci_set_drvdata(dev, info);
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		par->mtrr_reg = -1;
-		par->mtrr_reg = mtrr_add(info->fix.smem_start,
-				info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
-	}
-#endif
+	if (mtrr)
+		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+						  info->fix.smem_len);
 	return 0;
 
 err_reg_framebuffer:
@@ -1177,13 +1164,7 @@ static void i740fb_remove(struct pci_dev *dev)
 
 	if (info) {
 		struct i740fb_par *par = info->par;
-
-#ifdef CONFIG_MTRR
-		if (par->mtrr_reg >= 0) {
-			mtrr_del(par->mtrr_reg, 0, 0);
-			par->mtrr_reg = -1;
-		}
-#endif
+		arch_phys_wc_del(par->wc_cookie);
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
 		if (par->ddc_registered)
@@ -1287,10 +1268,8 @@ static int  __init i740fb_setup(char *options)
 	while ((opt = strsep(&options, ",")) != NULL) {
 		if (!*opt)
 			continue;
-#ifdef CONFIG_MTRR
 		else if (!strncmp(opt, "mtrr:", 5))
 			mtrr = simple_strtoul(opt + 5, NULL, 0);
-#endif
 		else
 			mode_option = opt;
 	}
@@ -1327,7 +1306,5 @@ MODULE_DESCRIPTION("fbdev driver for Intel740");
 module_param(mode_option, charp, 0444);
 MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
 
-#ifdef CONFIG_MTRR
 module_param(mtrr, int, 0444);
 MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
-#endif
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 38/47] video: fbdev: kyrofb: use arch_phys_wc_add() and pci_ioremap_wc_bar()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:44:38

From: "Luis R. Rodriguez" <redacted>

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/kyro/fbdev.c | 33 +++++++++++----------------------
 include/video/kyro.h             |  4 +---
 2 files changed, 12 insertions(+), 25 deletions(-)
diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c
index 65041e1..5bb0153 100644
--- a/drivers/video/fbdev/kyro/fbdev.c
+++ b/drivers/video/fbdev/kyro/fbdev.c
@@ -22,9 +22,6 @@
 #include <linux/pci.h>
 #include <asm/io.h>
 #include <linux/uaccess.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 
 #include <video/kyro.h>
 
@@ -84,9 +81,7 @@ static device_info_t deviceInfo;
 static char *mode_option = NULL;
 static int nopan = 0;
 static int nowrap = 1;
-#ifdef CONFIG_MTRR
 static int nomtrr = 0;
-#endif
 
 /* PCI driver prototypes */
 static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
@@ -570,10 +565,8 @@ static int __init kyrofb_setup(char *options)
 			nopan = 1;
 		} else if (strcmp(this_opt, "nowrap") = 0) {
 			nowrap = 1;
-#ifdef CONFIG_MTRR
 		} else if (strcmp(this_opt, "nomtrr") = 0) {
 			nomtrr = 1;
-#endif
 		} else {
 			mode_option = this_opt;
 		}
@@ -691,17 +684,16 @@ static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	currentpar->regbase = deviceInfo.pSTGReg  		ioremap_nocache(kyro_fix.mmio_start, kyro_fix.mmio_len);
+	if (!currentpar->regbase)
+		goto out_free_fb;
 
-	info->screen_base = ioremap_nocache(kyro_fix.smem_start,
-					    kyro_fix.smem_len);
+	info->screen_base = pci_ioremap_wc_bar(pdev, 0);
+	if (!info->screen_base)
+		goto out_unmap_regs;
 
-#ifdef CONFIG_MTRR
 	if (!nomtrr)
-		currentpar->mtrr_handle -			mtrr_add(kyro_fix.smem_start,
-				 kyro_fix.smem_len,
-				 MTRR_TYPE_WRCOMB, 1);
-#endif
+		currentpar->wc_cookie = arch_phys_wc_add(kyro_fix.smem_start,
+							 kyro_fix.smem_len);
 
 	kyro_fix.ypanstep	= nopan ? 0 : 1;
 	kyro_fix.ywrapstep	= nowrap ? 0 : 1;
@@ -745,8 +737,10 @@ static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	return 0;
 
 out_unmap:
-	iounmap(currentpar->regbase);
 	iounmap(info->screen_base);
+out_unmap_regs:
+	iounmap(currentpar->regbase);
+out_free_fb:
 	framebuffer_release(info);
 
 	return -EINVAL;
@@ -770,12 +764,7 @@ static void kyrofb_remove(struct pci_dev *pdev)
 	iounmap(info->screen_base);
 	iounmap(par->regbase);
 
-#ifdef CONFIG_MTRR
-	if (par->mtrr_handle)
-		mtrr_del(par->mtrr_handle,
-			 info->fix.smem_start,
-			 info->fix.smem_len);
-#endif
+	arch_phys_wc_del(par->wc_cookie);
 
 	unregister_framebuffer(info);
 	framebuffer_release(info);
diff --git a/include/video/kyro.h b/include/video/kyro.h
index c563968..b958c2e 100644
--- a/include/video/kyro.h
+++ b/include/video/kyro.h
@@ -35,9 +35,7 @@ struct kyrofb_info {
 	/* Useful to hold depth here for Linux */
 	u8 PIXDEPTH;
 
-#ifdef CONFIG_MTRR
-	int mtrr_handle;
-#endif
+	int wc_cookie;
 };
 
 extern int kyro_dev_init(void);
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 39/47] video: fbdev: pm2fb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:46:50

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/pm2fb.c | 31 +++++--------------------------
 1 file changed, 5 insertions(+), 26 deletions(-)
diff --git a/drivers/video/fbdev/pm2fb.c b/drivers/video/fbdev/pm2fb.c
index 3b85b64..aa8d288 100644
--- a/drivers/video/fbdev/pm2fb.c
+++ b/drivers/video/fbdev/pm2fb.c
@@ -38,10 +38,6 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/pci.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include <video/permedia2.h>
 #include <video/cvisionppc.h>
 
@@ -81,10 +77,7 @@ static char *mode_option;
 static bool lowhsync;
 static bool lowvsync;
 static bool noaccel;
-/* mtrr option */
-#ifdef CONFIG_MTRR
 static bool nomtrr;
-#endif
 
 /*
  * The hardware state of the graphics card that isn't part of the
@@ -100,7 +93,7 @@ struct pm2fb_par
 	u32		mem_control;	/* MemControl reg at probe */
 	u32		boot_address;	/* BootAddress reg at probe */
 	u32		palette[16];
-	int		mtrr_handle;
+	int		wc_cookie;
 };
 
 /*
@@ -1637,21 +1630,16 @@ static int pm2fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_exit_mmio;
 	}
 	info->screen_base -		ioremap_nocache(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
+		ioremap_wc(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
 	if (!info->screen_base) {
 		printk(KERN_WARNING "pm2fb: Can't ioremap smem area.\n");
 		release_mem_region(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
 		goto err_exit_mmio;
 	}
 
-#ifdef CONFIG_MTRR
-	default_par->mtrr_handle = -1;
 	if (!nomtrr)
-		default_par->mtrr_handle -			mtrr_add(pm2fb_fix.smem_start,
-				 pm2fb_fix.smem_len,
-				 MTRR_TYPE_WRCOMB, 1);
-#endif
+		default_par->wc_cookie = arch_phys_wc_add(pm2fb_fix.smem_start,
+							  pm2fb_fix.smem_len);
 
 	info->fbops		= &pm2fb_ops;
 	info->fix		= pm2fb_fix;
@@ -1733,12 +1721,7 @@ static void pm2fb_remove(struct pci_dev *pdev)
 	struct pm2fb_par *par = info->par;
 
 	unregister_framebuffer(info);
-
-#ifdef CONFIG_MTRR
-	if (par->mtrr_handle >= 0)
-		mtrr_del(par->mtrr_handle, info->fix.smem_start,
-			 info->fix.smem_len);
-#endif /* CONFIG_MTRR */
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(info->screen_base);
 	release_mem_region(fix->smem_start, fix->smem_len);
 	iounmap(par->v_regs);
@@ -1791,10 +1774,8 @@ static int __init pm2fb_setup(char *options)
 			lowvsync = 1;
 		else if (!strncmp(this_opt, "hwcursor=", 9))
 			hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
-#ifdef CONFIG_MTRR
 		else if (!strncmp(this_opt, "nomtrr", 6))
 			nomtrr = 1;
-#endif
 		else if (!strncmp(this_opt, "noaccel", 7))
 			noaccel = 1;
 		else
@@ -1847,10 +1828,8 @@ MODULE_PARM_DESC(noaccel, "Disable acceleration");
 module_param(hwcursor, int, 0644);
 MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
 			"(1=enable, 0=disable, default=1)");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
-#endif
 
 MODULE_AUTHOR("Jim Hague <jim.hague@acm.org>");
 MODULE_DESCRIPTION("Permedia2 framebuffer device driver");
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 40/47] video: fbdev: pm3fb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:49:02

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/pm3fb.c | 30 ++++++------------------------
 1 file changed, 6 insertions(+), 24 deletions(-)
diff --git a/drivers/video/fbdev/pm3fb.c b/drivers/video/fbdev/pm3fb.c
index 77b99ed..6ff5077 100644
--- a/drivers/video/fbdev/pm3fb.c
+++ b/drivers/video/fbdev/pm3fb.c
@@ -32,9 +32,6 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/pci.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 
 #include <video/pm3fb.h>
 
@@ -58,11 +55,7 @@
 static int hwcursor = 1;
 static char *mode_option;
 static bool noaccel;
-
-/* mtrr option */
-#ifdef CONFIG_MTRR
 static bool nomtrr;
-#endif
 
 /*
  * This structure defines the hardware state of the graphics card. Normally
@@ -76,7 +69,7 @@ struct pm3_par {
 	u32		video;		/* video flags before blanking */
 	u32		base;		/* screen base in 128 bits unit */
 	u32		palette[16];
-	int		mtrr_handle;
+	int		wc_cookie;
 };
 
 /*
@@ -1374,8 +1367,8 @@ static int pm3fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 		printk(KERN_WARNING "pm3fb: Can't reserve smem.\n");
 		goto err_exit_mmio;
 	}
-	info->screen_base -		ioremap_nocache(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+	info->screen_base = ioremap_wc(pm3fb_fix.smem_start,
+				       pm3fb_fix.smem_len);
 	if (!info->screen_base) {
 		printk(KERN_WARNING "pm3fb: Can't ioremap smem area.\n");
 		release_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
@@ -1383,12 +1376,9 @@ static int pm3fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
 	}
 	info->screen_size = pm3fb_fix.smem_len;
 
-#ifdef CONFIG_MTRR
 	if (!nomtrr)
-		par->mtrr_handle = mtrr_add(pm3fb_fix.smem_start,
-						pm3fb_fix.smem_len,
-						MTRR_TYPE_WRCOMB, 1);
-#endif
+		par->wc_cookie = arch_phys_wc_add(pm3fb_fix.smem_start,
+						  pm3fb_fix.smem_len);
 	info->fbops = &pm3fb_ops;
 
 	par->video = PM3_READ_REG(par, PM3VideoControl);
@@ -1478,11 +1468,7 @@ static void pm3fb_remove(struct pci_dev *dev)
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
 
-#ifdef CONFIG_MTRR
-		if (par->mtrr_handle >= 0)
-			mtrr_del(par->mtrr_handle, info->fix.smem_start,
-				 info->fix.smem_len);
-#endif /* CONFIG_MTRR */
+		arch_phys_wc_del(par->wc_cookie);
 		iounmap(info->screen_base);
 		release_mem_region(fix->smem_start, fix->smem_len);
 		iounmap(par->v_regs);
@@ -1533,10 +1519,8 @@ static int __init pm3fb_setup(char *options)
 			noaccel = 1;
 		else if (!strncmp(this_opt, "hwcursor=", 9))
 			hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
-#ifdef CONFIG_MTRR
 		else if (!strncmp(this_opt, "nomtrr", 6))
 			nomtrr = 1;
-#endif
 		else
 			mode_option = this_opt;
 	}
@@ -1577,10 +1561,8 @@ MODULE_PARM_DESC(noaccel, "Disable acceleration");
 module_param(hwcursor, int, 0644);
 MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
 			"(1=enable, 0=disable, default=1)");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
-#endif
 
 MODULE_DESCRIPTION("Permedia3 framebuffer device driver");
 MODULE_LICENSE("GPL");
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 41/47] video: fbdev: rivafb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:51:14

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/riva/fbdev.c  | 39 +++++++--------------------------------
 drivers/video/fbdev/riva/rivafb.h |  4 +---
 2 files changed, 8 insertions(+), 35 deletions(-)
diff --git a/drivers/video/fbdev/riva/fbdev.c b/drivers/video/fbdev/riva/fbdev.c
index be73727..854b86d 100644
--- a/drivers/video/fbdev/riva/fbdev.c
+++ b/drivers/video/fbdev/riva/fbdev.c
@@ -41,9 +41,6 @@
 #include <linux/pci.h>
 #include <linux/backlight.h>
 #include <linux/bitrev.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #ifdef CONFIG_PPC_OF
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
@@ -208,9 +205,7 @@ MODULE_DEVICE_TABLE(pci, rivafb_pci_tbl);
 static int flatpanel = -1; /* Autodetect later */
 static int forceCRTC = -1;
 static bool noaccel  = 0;
-#ifdef CONFIG_MTRR
 static bool nomtrr = 0;
-#endif
 #ifdef CONFIG_PMAC_BACKLIGHT
 static int backlight = 1;
 #else
@@ -2013,28 +2008,18 @@ static int rivafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
 
 	rivafb_fix.smem_len = riva_get_memlen(default_par) * 1024;
 	default_par->dclk_max = riva_get_maxdclk(default_par) * 1000;
-	info->screen_base = ioremap(rivafb_fix.smem_start,
-				    rivafb_fix.smem_len);
+	info->screen_base = ioremap_wc(rivafb_fix.smem_start,
+				       rivafb_fix.smem_len);
 	if (!info->screen_base) {
 		printk(KERN_ERR PFX "cannot ioremap FB base\n");
 		ret = -EIO;
 		goto err_iounmap_pramin;
 	}
 
-#ifdef CONFIG_MTRR
-	if (!nomtrr) {
-		default_par->mtrr.vram = mtrr_add(rivafb_fix.smem_start,
-					   	  rivafb_fix.smem_len,
-					    	  MTRR_TYPE_WRCOMB, 1);
-		if (default_par->mtrr.vram < 0) {
-			printk(KERN_ERR PFX "unable to setup MTRR\n");
-		} else {
-			default_par->mtrr.vram_valid = 1;
-			/* let there be speed */
-			printk(KERN_INFO PFX "RIVA MTRR set to ON\n");
-		}
-	}
-#endif /* CONFIG_MTRR */
+	if (!nomtrr)
+		default_par->wc_cookie +			arch_phys_wc_add(rivafb_fix.smem_start,
+					 rivafb_fix.smem_len);
 
 	info->fbops = &riva_fb_ops;
 	info->fix = rivafb_fix;
@@ -2108,13 +2093,7 @@ static void rivafb_remove(struct pci_dev *pd)
 	unregister_framebuffer(info);
 
 	riva_bl_exit(info);
-
-#ifdef CONFIG_MTRR
-	if (par->mtrr.vram_valid)
-		mtrr_del(par->mtrr.vram, info->fix.smem_start,
-			 info->fix.smem_len);
-#endif /* CONFIG_MTRR */
-
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(par->ctrl_base);
 	iounmap(info->screen_base);
 	if (par->riva.Architecture = NV_ARCH_03)
@@ -2153,10 +2132,8 @@ static int rivafb_setup(char *options)
 			flatpanel = 1;
 		} else if (!strncmp(this_opt, "backlight:", 10)) {
 			backlight = simple_strtoul(this_opt+10, NULL, 0);
-#ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
-#endif
 		} else if (!strncmp(this_opt, "strictmode", 10)) {
 			strictmode = 1;
 		} else if (!strncmp(this_opt, "noaccel", 7)) {
@@ -2212,10 +2189,8 @@ module_param(flatpanel, int, 0);
 MODULE_PARM_DESC(flatpanel, "Enables experimental flat panel support for some chipsets. (0 or 1=enabled) (default=0)");
 module_param(forceCRTC, int, 0);
 MODULE_PARM_DESC(forceCRTC, "Forces usage of a particular CRTC in case autodetection fails. (0 or 1) (default=autodetect)");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disables MTRR support (0 or 1=disabled) (default=0)");
-#endif
 module_param(strictmode, bool, 0);
 MODULE_PARM_DESC(strictmode, "Only use video modes from EDID");
 
diff --git a/drivers/video/fbdev/riva/rivafb.h b/drivers/video/fbdev/riva/rivafb.h
index d9f107b..61fd37c 100644
--- a/drivers/video/fbdev/riva/rivafb.h
+++ b/drivers/video/fbdev/riva/rivafb.h
@@ -61,9 +61,7 @@ struct riva_par {
 	int FlatPanel;
 	struct pci_dev *pdev;
 	int cursor_reset;
-#ifdef CONFIG_MTRR
-	struct { int vram; int vram_valid; } mtrr;
-#endif
+	int wc_cookie;
 	struct riva_i2c_chan chan[3];
 };
 
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 42/47] video: fbdev: tdfxfb: use arch_phys_wc_add() and ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:53:26

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/tdfxfb.c | 41 ++++++-----------------------------------
 include/video/tdfx.h         |  2 +-
 2 files changed, 7 insertions(+), 36 deletions(-)
diff --git a/drivers/video/fbdev/tdfxfb.c b/drivers/video/fbdev/tdfxfb.c
index f761fe3..621fa44 100644
--- a/drivers/video/fbdev/tdfxfb.c
+++ b/drivers/video/fbdev/tdfxfb.c
@@ -78,24 +78,6 @@
 
 #define DPRINTK(a, b...) pr_debug("fb: %s: " a, __func__ , ## b)
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#else
-/* duplicate asm/mtrr.h defines to work on archs without mtrr */
-#define MTRR_TYPE_WRCOMB     1
-
-static inline int mtrr_add(unsigned long base, unsigned long size,
-				unsigned int type, char increment)
-{
-    return -ENODEV;
-}
-static inline int mtrr_del(int reg, unsigned long base,
-				unsigned long size)
-{
-    return -ENODEV;
-}
-#endif
-
 #define BANSHEE_MAX_PIXCLOCK 270000
 #define VOODOO3_MAX_PIXCLOCK 300000
 #define VOODOO5_MAX_PIXCLOCK 350000
@@ -167,7 +149,6 @@ static int nopan;
 static int nowrap = 1;      /* not implemented (yet) */
 static int hwcursor = 1;
 static char *mode_option;
-/* mtrr option */
 static bool nomtrr;
 
 /* -------------------------------------------------------------------------
@@ -1454,8 +1435,8 @@ static int tdfxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out_err_regbase;
 	}
 
-	info->screen_base = ioremap_nocache(info->fix.smem_start,
-					    info->fix.smem_len);
+	info->screen_base = ioremap_wc(info->fix.smem_start,
+				       info->fix.smem_len);
 	if (!info->screen_base) {
 		printk(KERN_ERR "fb: Can't remap %s framebuffer.\n",
 				info->fix.id);
@@ -1473,11 +1454,9 @@ static int tdfxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	printk(KERN_INFO "fb: %s memory = %dK\n", info->fix.id,
 			info->fix.smem_len >> 10);
 
-	default_par->mtrr_handle = -1;
 	if (!nomtrr)
-		default_par->mtrr_handle -			mtrr_add(info->fix.smem_start, info->fix.smem_len,
-				 MTRR_TYPE_WRCOMB, 1);
+		default_par->wc_cookie= arch_phys_wc_add(info->fix.smem_start,
+							 info->fix.smem_len);
 
 	info->fix.ypanstep	= nopan ? 0 : 1;
 	info->fix.ywrapstep	= nowrap ? 0 : 1;
@@ -1566,9 +1545,7 @@ out_err_iobase:
 #ifdef CONFIG_FB_3DFX_I2C
 	tdfxfb_delete_i2c_busses(default_par);
 #endif
-	if (default_par->mtrr_handle >= 0)
-		mtrr_del(default_par->mtrr_handle, info->fix.smem_start,
-			 info->fix.smem_len);
+	arch_phys_wc_del(default_par->wc_cookie);
 	release_region(pci_resource_start(pdev, 2),
 		       pci_resource_len(pdev, 2));
 out_err_screenbase:
@@ -1604,10 +1581,8 @@ static void __init tdfxfb_setup(char *options)
 			nowrap = 1;
 		} else if (!strncmp(this_opt, "hwcursor=", 9)) {
 			hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
-#ifdef CONFIG_MTRR
 		} else if (!strncmp(this_opt, "nomtrr", 6)) {
 			nomtrr = 1;
-#endif
 		} else {
 			mode_option = this_opt;
 		}
@@ -1633,9 +1608,7 @@ static void tdfxfb_remove(struct pci_dev *pdev)
 #ifdef CONFIG_FB_3DFX_I2C
 	tdfxfb_delete_i2c_busses(par);
 #endif
-	if (par->mtrr_handle >= 0)
-		mtrr_del(par->mtrr_handle, info->fix.smem_start,
-			 info->fix.smem_len);
+	arch_phys_wc_del(par->wc_cookie);
 	iounmap(par->regbase_virt);
 	iounmap(info->screen_base);
 
@@ -1677,10 +1650,8 @@ MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
 			"(1=enable, 0=disable, default=1)");
 module_param(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "Initial video mode e.g. '648x480-8@60'");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disable MTRR support (default: enabled)");
-#endif
 
 module_init(tdfxfb_init);
 module_exit(tdfxfb_exit);
diff --git a/include/video/tdfx.h b/include/video/tdfx.h
index befbaf0..69674b9 100644
--- a/include/video/tdfx.h
+++ b/include/video/tdfx.h
@@ -196,7 +196,7 @@ struct tdfx_par {
 	u32 palette[16];
 	void __iomem *regbase_virt;
 	unsigned long iobase;
-	int mtrr_handle;
+	int wc_cookie;
 #ifdef CONFIG_FB_3DFX_I2C
 	struct tdfxfb_i2c_chan chan[2];
 #endif
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 43/47] video: fbdev: vt8623fb: use arch_phys_wc_add() and pci_iomap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:55:38

From: "Luis R. Rodriguez" <redacted>

This driver uses the same area for MTRR as for the ioremap().
Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available, in order to
take advantage of that also ensure the ioremap'd area is requested
as write-combining.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/vt8623fb.c | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)
diff --git a/drivers/video/fbdev/vt8623fb.c b/drivers/video/fbdev/vt8623fb.c
index ea7f056..60f24828 100644
--- a/drivers/video/fbdev/vt8623fb.c
+++ b/drivers/video/fbdev/vt8623fb.c
@@ -26,13 +26,9 @@
 #include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
 #include <video/vga.h>
 
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 struct vt8623fb_info {
 	char __iomem *mmio_base;
-	int mtrr_reg;
+	int wc_cookie;
 	struct vgastate state;
 	struct mutex open_lock;
 	unsigned int ref_count;
@@ -99,10 +95,7 @@ static struct svga_timing_regs vt8623_timing_regs     = {
 /* Module parameters */
 
 static char *mode_option = "640x480-8@60";
-
-#ifdef CONFIG_MTRR
 static int mtrr = 1;
-#endif
 
 MODULE_AUTHOR("(c) 2006 Ondrej Zajicek <santiago@crfreenet.org>");
 MODULE_LICENSE("GPL");
@@ -112,11 +105,8 @@ module_param(mode_option, charp, 0644);
 MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
 module_param_named(mode, mode_option, charp, 0);
 MODULE_PARM_DESC(mode, "Default video mode e.g. '648x480-8@60' (deprecated)");
-
-#ifdef CONFIG_MTRR
 module_param(mtrr, int, 0444);
 MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
-#endif
 
 
 /* ------------------------------------------------------------------------- */
@@ -710,7 +700,7 @@ static int vt8623_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	info->fix.mmio_len = pci_resource_len(dev, 1);
 
 	/* Map physical IO memory address into kernel space */
-	info->screen_base = pci_iomap(dev, 0, 0);
+	info->screen_base = pci_iomap_wc(dev, 0, 0);
 	if (! info->screen_base) {
 		rc = -ENOMEM;
 		dev_err(info->device, "iomap for framebuffer failed\n");
@@ -781,12 +771,9 @@ static int vt8623_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	/* Record a reference to the driver data */
 	pci_set_drvdata(dev, info);
 
-#ifdef CONFIG_MTRR
-	if (mtrr) {
-		par->mtrr_reg = -1;
-		par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1);
-	}
-#endif
+	if (mtrr)
+		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+						  info->fix.smem_len);
 
 	return 0;
 
@@ -816,13 +803,7 @@ static void vt8623_pci_remove(struct pci_dev *dev)
 	if (info) {
 		struct vt8623fb_info *par = info->par;
 
-#ifdef CONFIG_MTRR
-		if (par->mtrr_reg >= 0) {
-			mtrr_del(par->mtrr_reg, 0, 0);
-			par->mtrr_reg = -1;
-		}
-#endif
-
+		arch_phys_wc_del(par->wc_cookie);
 		unregister_framebuffer(info);
 		fb_dealloc_cmap(&info->cmap);
 
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 44/47] video: fbdev: atmel_lcdfb: use ioremap_wc() for framebuffer

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 00:57:50

From: "Luis R. Rodriguez" <redacted>

The driver doesn't use mtrr_add() or arch_phys_wc_add() but
since we know the framebuffer is isolated already on an
ioremap() we can take advantage of write combining for
performance where possible.

In this case there are a few motivations for this:

a) Take advantage of PAT when available

b) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/atmel_lcdfb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c
index 94a8d04..abadc49 100644
--- a/drivers/video/fbdev/atmel_lcdfb.c
+++ b/drivers/video/fbdev/atmel_lcdfb.c
@@ -1266,7 +1266,8 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
 			goto stop_clk;
 		}
 
-		info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
+		info->screen_base = ioremap_wc(info->fix.smem_start,
+					       info->fix.smem_len);
 		if (!info->screen_base) {
 			ret = -ENOMEM;
 			goto release_intmem;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 45/47] video: fbdev: geode gxfb: use ioremap_wc() for framebuffer

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 01:00:04

From: "Luis R. Rodriguez" <redacted>

The driver doesn't use mtrr_add() or arch_phys_wc_add() but
since we know the framebuffer is isolated already on an
ioremap() we can take advantage of write combining for
performance where possible.

In this case there are a few motivations for this:

a) Take advantage of PAT when available

b) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/geode/gxfb_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/geode/gxfb_core.c b/drivers/video/fbdev/geode/gxfb_core.c
index 124d7c7..ec9fc9a 100644
--- a/drivers/video/fbdev/geode/gxfb_core.c
+++ b/drivers/video/fbdev/geode/gxfb_core.c
@@ -263,7 +263,8 @@ static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
 
 	info->fix.smem_start = pci_resource_start(dev, 0);
 	info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
-	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
+	info->screen_base = ioremap_wc(info->fix.smem_start,
+				       info->fix.smem_len);
 	if (!info->screen_base)
 		return -ENOMEM;
 
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 46/47] video: fbdev: gxt4500: use pci_ioremap_wc_bar() for framebuffer

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 01:02:15

From: "Luis R. Rodriguez" <redacted>

The driver doesn't use mtrr_add() or arch_phys_wc_add() but
since we know the framebuffer is isolated already on an
ioremap() we can take advantage of write combining for
performance where possible.

In this case there are a few motivations for this:

a) Take advantage of PAT when available

b) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/video/fbdev/gxt4500.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/gxt4500.c b/drivers/video/fbdev/gxt4500.c
index 135d78a..f19133a 100644
--- a/drivers/video/fbdev/gxt4500.c
+++ b/drivers/video/fbdev/gxt4500.c
@@ -662,7 +662,7 @@ static int gxt4500_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	info->fix.smem_start = fb_phys;
 	info->fix.smem_len = pci_resource_len(pdev, 1);
-	info->screen_base = pci_ioremap_bar(pdev, 1);
+	info->screen_base = pci_ioremap_wc_bar(pdev, 1);
 	if (!info->screen_base) {
 		dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n");
 		goto err_unmap_regs;
-- 
2.3.2.209.gd67f9d5.dirty

[PATCH v1 47/47] mtrr: bury MTRR - unexport mtrr_add() and mtrr_del()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-21 01:04:28

From: "Luis R. Rodriguez" <redacted>

The crusade to replace mtrr_add() with architecture agnostic
arch_phys_wc_add() is complete, this will ensure write-combining
implementations (PAT on x86) is taken advantage instead of using
MTRR. With the crusade done now, hide direct MTRR access for
drivers.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/kernel/cpu/mtrr/main.c | 2 --
 1 file changed, 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index b68b671..f0e19db 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -446,7 +446,6 @@ int mtrr_add(unsigned long base, unsigned long size, unsigned int type,
 	return mtrr_add_page(base >> PAGE_SHIFT, size >> PAGE_SHIFT, type,
 			     increment);
 }
-EXPORT_SYMBOL(mtrr_add);
 
 /**
  * mtrr_del_page - delete a memory type region
@@ -535,7 +534,6 @@ int mtrr_del(int reg, unsigned long base, unsigned long size)
 		return -EINVAL;
 	return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
 }
-EXPORT_SYMBOL(mtrr_del);
 
 /**
  * __arch_phys_wc_add - add a WC MTRR even if PAT is available
-- 
2.3.2.209.gd67f9d5.dirty

Re: [PATCH v1 00/47] mtrr/x86/drivers: bury MTRR

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-21 01:09:03

On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
From: "Luis R. Rodriguez" <redacted>

When a system has PAT support enabled you don't need to be
using MTRRs. Andy had added arch_phys_wc_add() long ago to
help with this but not all drivers were converted over. We
have to take care to only convert drivers where we know that
the proper ioremap_wc() API has been used. Doing this requires
a bit of work on verifying the driver split out the ioremap'd
areas -- and if not doing that ourselves. Verifying a driver
uses the same areas can be hard but with a bit of love Coccinelle
can help with that.

We're motivated to change drivers for a few reasons:

1) Take advantage of PAT when available

2) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)
Nice!

--Andy

Re: [PATCH v1 21/47] ethernet: myri10ge: use arch_phys_wc_add()

From: Hyong-Youb Kim <hidden>
Date: 2015-03-21 07:23:00

On Fri, Mar 20, 2015 at 04:18:11PM -0700, Luis R. Rodriguez wrote:
From: "Luis R. Rodriguez" <redacted>

This driver already uses ioremap_wc() on the same range
so when write-combining is available that will be used
instead.
[...]
quoted hunk
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
[...]
quoted hunk
@@ -1984,7 +1979,6 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
 		data[i] = ((u64 *)&link_stats)[i];
 
 	data[i++] = (unsigned int)mgp->tx_boundary;
-	data[i++] = (unsigned int)mgp->wc_enabled;
 	data[i++] = (unsigned int)mgp->pdev->irq;
 	data[i++] = (unsigned int)mgp->msi_enabled;
 	data[i++] = (unsigned int)mgp->msix_enabled;
You would have to delete "WC from myri10ge_gstrings_main_stats too.
Something like below.  Thanks.
@@ -1905,7 +1905,7 @@ static const char myri10ge_gstrings_main_stats[][ETH_GSTRING_LEN] = {
 	"tx_aborted_errors", "tx_carrier_errors", "tx_fifo_errors",
 	"tx_heartbeat_errors", "tx_window_errors",
 	/* device-specific stats */
-	"tx_boundary", "WC", "irq", "MSI", "MSIX",
+	"tx_boundary", "irq", "MSI", "MSIX",
 	"read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
 	"serial_number", "watchdog_resets",
 #ifdef CONFIG_MYRI10GE_DCA

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Ville Syrjälä <syrjala@sci.fi>
Date: 2015-03-21 09:15:27

On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted hunk
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)
 
 #ifdef CONFIG_MTRR
 	par->mtrr_aper = -1;
-	par->mtrr_reg = -1;
 	if (!nomtrr) {
-		/* Cover the whole resource. */
-		par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+		par->mtrr_aper = mtrr_add(info->fix.smem_start,
+					  info->fix.smem_len,
 					  MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
quoted hunk
-		if (par->mtrr_aper >= 0 && !par->aux_start) {
-			/* Make a hole for mmio. */
-			par->mtrr_reg = mtrr_add(par->res_start + 0x800000 -
-						 GUI_RESERVE, GUI_RESERVE,
-						 MTRR_TYPE_UNCACHABLE, 1);
-			if (par->mtrr_reg < 0) {
-				mtrr_del(par->mtrr_aper, 0, 0);
-				par->mtrr_aper = -1;
-			}
-		}
 	}
 #endif
 
@@ -2776,10 +2765,6 @@ aty_init_exit:
 	par->pll_ops->set_pll(info, &par->saved_pll);
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
@@ -3466,7 +3451,7 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	}
 
 	info->fix.mmio_start = raddr;
-	par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+	par->ati_regbase = ioremap_nocache(info->fix.mmio_start, 0x1000);
 	if (par->ati_regbase = NULL)
 		return -ENOMEM;
 
@@ -3491,6 +3476,8 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	info->fix.smem_start = addr;
 	info->fix.smem_len = 0x800000;
 
+	aty_fudge_framebuffer_len(info);
+
 	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 	if (info->screen_base = NULL) {
 		ret = -ENOMEM;
@@ -3563,6 +3550,7 @@ static int atyfb_pci_probe(struct pci_dev *pdev,
 		return -ENOMEM;
 	}
 	par = info->par;
+	par->bus_type = PCI;
 	info->fix = atyfb_fix;
 	info->device = &pdev->dev;
 	par->pci_id = pdev->device;
@@ -3732,10 +3720,6 @@ static void atyfb_remove(struct fb_info *info)
 #endif
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
-- 
2.3.2.209.gd67f9d5.dirty

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-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/

Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Bjorn Helgaas <bhelgaas@google.com>
Date: 2015-03-23 17:21:15

Hi Luis,

This seems OK to me, but I'm curious about a few things.

On Fri, Mar 20, 2015 at 6:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
From: "Luis R. Rodriguez" <redacted>

This allows drivers to take advantage of write-combining
when possible. Ideally we'd have pci_read_bases() just
peg an IORESOURCE_WC flag for us
We do set IORESOURCE_PREFETCH.  Do you mean something different?
 but where exactly
video devices memory lie varies *largely* and at times things
are mixed with MMIO registers, sometimes we can address
the changes in drivers, other times the change requires
intrusive changes.
What does a video device address have to do with this?  I do see that
if a BAR maps only a frame buffer, the device might be able to mark it
prefetchable, while if the BAR mapped both a frame buffer and some
registers, it might not be able to make it prefetchable.  But that
doesn't seem like it depends on the *address*.

pci_iomap_range() already makes a cacheable mapping if
IORESOURCE_CACHEABLE; I'm guessing that you would like it to
automatically use WC if the BAR if IORESOURCE_PREFETCH, e.g.,

  if (flags & IORESOURCE_CACHEABLE)
    return ioremap(start, len);
  if (flags & IORESOURCE_PREFETCH)
    return ioremap_wc(start, len);
  return ioremap_nocache(start, len);

Is there a reason not to do that?
Although there is also arch_phys_wc_add() that makes use of
architecture specific write-combinging alternatives (MTRR on
x86 when a system does not have PAT) we void polluting
pci_iomap() space with it and force drivers and subsystems
that want to use it to be explicit.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)
...
+void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
+                                int bar,
+                                unsigned long offset,
+                                unsigned long maxlen)
+{
+       resource_size_t start = pci_resource_start(dev, bar);
+       resource_size_t len = pci_resource_len(dev, bar);
+       unsigned long flags = pci_resource_flags(dev, bar);
+
+       if (len <= offset || !start)
+               return NULL;
+       len -= offset;
+       start += offset;
+       if (maxlen && len > maxlen)
+               len = maxlen;
+       if (flags & IORESOURCE_IO)
+               return __pci_ioport_map(dev, start, len);
+       if (flags & IORESOURCE_MEM)
Should we log a note in dmesg if the BAR is *not* IORESOURCE_PREFETCH?
 I know the driver might know it's safe even if the device didn't mark
the BAR as prefetchable, but it does seem like an easy way for a
driver to shoot itself in the foot.
+               return ioremap_wc(start, len);
+       /* What? */
+       return NULL;
+}

Re: [PATCH v1 03/47] devres: add devm_ioremap_wc()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-25 19:51:04

On Fri, Mar 20, 2015 at 04:49:51PM -0700, Andy Lutomirski wrote:
On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

We have devm_ioremap_nocache() but no devm_ioremap_wc()
so add that. This will be used later.

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
Looks good to me.
Thanks, I'll peg a Reviewed-by.

 Luis

Re: [PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

From: Konrad Rzeszutek Wilk <hidden>
Date: 2015-03-25 20:03:02

On Fri, Mar 20, 2015 at 04:17:52PM -0700, Luis R. Rodriguez wrote:
From: "Luis R. Rodriguez" <redacted>

It is possible to enable CONFIG_MTRR and up with it
disabled at run time and yet CONFIG_X86_PAT continues
to kick through fully functionally. This can happen
s/fully/full/ ?

for instance on Xen where MTRR is not supported but
PAT is, this can happen now on Linux as of commit
47591df50 by Juergen introduced as of v3.19.
s/3.19/4.0/
Technically we should assume the proper CPU
bits would be set to disable MTRR but we can't
always rely on this. At least on the Xen Hypervisor
for instance only X86_FEATURE_MTRR was disabled
as of Xen 4.4 through Xen commit 586ab6a [0],
but not X86_FEATURE_K6_MTRR, X86_FEATURE_CENTAUR_MCR,
or X86_FEATURE_CYRIX_ARR for instance.
Oh, could you send an patch for that to Xen please?
x86 mtrr code relies on quite a bit of checks for
mtrr_if being set to check to see if MTRR did get
set up, instead of using that lets provide a generic
setter which when set we know MTRR is enabled. This
s/we know MTRR is enabled/will let us know that MTRR is enabled/
quoted hunk
also adds a few checks where they were not before
which could potentially safeguard ourselves against
incorrect usage of MTRR where this was not desirable.

Where possible match error codes as if MTRR was
disabled on arch/x86/include/asm/mtrr.h.

Lastly, since disabling MTRR can happen at run time
and we could end up with PAT enabled best record now
on our logs when MTRR is disabled.

[0] ~/devel/xen (git::stable-4.5)$ git describe --contains 586ab6a
4.4.0-rc1~18

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: bhelgaas@google.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 arch/x86/include/asm/mtrr.h        |  2 ++
 arch/x86/kernel/cpu/mtrr/cleanup.c |  2 +-
 arch/x86/kernel/cpu/mtrr/generic.c |  5 +++--
 arch/x86/kernel/cpu/mtrr/if.c      |  3 +++
 arch/x86/kernel/cpu/mtrr/main.c    | 31 ++++++++++++++++++++++---------
 5 files changed, 31 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index f768f62..cade917 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -31,6 +31,7 @@
  * arch_phys_wc_add and arch_phys_wc_del.
  */
 # ifdef CONFIG_MTRR
+extern int mtrr_enabled;
 extern u8 mtrr_type_lookup(u64 addr, u64 end);
 extern void mtrr_save_fixed_ranges(void *);
 extern void mtrr_save_state(void);
@@ -50,6 +51,7 @@ extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
 extern int amd_special_default_mtrr(void);
 extern int phys_wc_to_mtrr_index(int handle);
 #  else
+static const int mtrr_enabled;
 static inline u8 mtrr_type_lookup(u64 addr, u64 end)
 {
 	/*
diff --git a/arch/x86/kernel/cpu/mtrr/cleanup.c b/arch/x86/kernel/cpu/mtrr/cleanup.c
index 5f90b85..784dc55 100644
--- a/arch/x86/kernel/cpu/mtrr/cleanup.c
+++ b/arch/x86/kernel/cpu/mtrr/cleanup.c
@@ -880,7 +880,7 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
 	 * Make sure we only trim uncachable memory on machines that
 	 * support the Intel MTRR architecture:
 	 */
-	if (!is_cpu(INTEL) || disable_mtrr_trim)
+	if (!is_cpu(INTEL) || disable_mtrr_trim || !mtrr_enabled)
 		return 0;
 
 	rdmsr(MSR_MTRRdefType, def, dummy);
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 09c82de..df321b2 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -116,7 +116,8 @@ static u8 __mtrr_type_lookup(u64 start, u64 end, u64 *partial_end, int *repeat)
 	u8 prev_match, curr_match;
 
 	*repeat = 0;
-	if (!mtrr_state_set)
+	/* generic_mtrr_ops is only set for generic_mtrr_ops */
+	if (!mtrr_state_set || !mtrr_enabled)
 		return 0xFF;
 
 	if (!mtrr_state.enabled)
@@ -290,7 +291,7 @@ static void get_fixed_ranges(mtrr_type *frs)
 
 void mtrr_save_fixed_ranges(void *info)
 {
-	if (cpu_has_mtrr)
+	if (mtrr_enabled && cpu_has_mtrr)
 		get_fixed_ranges(mtrr_state.fixed_ranges);
 }
 
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index d76f13d..e9e001a 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -436,6 +436,9 @@ static int __init mtrr_if_init(void)
 {
 	struct cpuinfo_x86 *c = &boot_cpu_data;
 
+	if (!mtrr_enabled)
+		return 0;
+
 	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
 	    (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
 	    (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index ea5f363..7db9c47 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -59,6 +59,7 @@
 #define MTRR_TO_PHYS_WC_OFFSET 1000
 
 u32 num_var_ranges;
+int mtrr_enabled;
 
 unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 static DEFINE_MUTEX(mtrr_mutex);
@@ -84,6 +85,9 @@ static int have_wrcomb(void)
 {
 	struct pci_dev *dev;
 
+	if (!mtrr_enabled)
+		return 0;
+
 	dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL);
 	if (dev != NULL) {
 		/*
@@ -286,7 +290,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
 	int i, replace, error;
 	mtrr_type ltype;
 
-	if (!mtrr_if)
+	if (!mtrr_enabled)
 		return -ENXIO;
 
 	error = mtrr_if->validate_add_page(base, size, type);
@@ -388,6 +392,8 @@ int mtrr_add_page(unsigned long base, unsigned long size,
 
 static int mtrr_check(unsigned long base, unsigned long size)
 {
+	if (!mtrr_enabled)
+		return -ENODEV;
 	if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
 		pr_warning("mtrr: size and base must be multiples of 4 kiB\n");
 		pr_debug("mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
@@ -463,8 +469,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 	unsigned long lbase, lsize;
 	int error = -EINVAL;
 
-	if (!mtrr_if)
-		return -ENXIO;
+	if (!mtrr_enabled)
+		return -ENODEV;
 
 	max = num_var_ranges;
 	/* No CPU hotplug when we change MTRR entries */
@@ -523,6 +529,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
  */
 int mtrr_del(int reg, unsigned long base, unsigned long size)
 {
+	if (!mtrr_enabled)
+		return -ENODEV;
 	if (mtrr_check(base, size))
 		return -EINVAL;
 	return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
@@ -545,7 +553,7 @@ int arch_phys_wc_add(unsigned long base, unsigned long size)
 {
 	int ret;
 
-	if (pat_enabled)
+	if (pat_enabled || !mtrr_enabled)
 		return 0;  /* Success!  (We don't need to do anything.) */
 
 	ret = mtrr_add(base, size, MTRR_TYPE_WRCOMB, true);
@@ -734,6 +742,7 @@ void __init mtrr_bp_init(void)
 	}
 
 	if (mtrr_if) {
+		mtrr_enabled = true;
 		set_num_var_ranges();
 		init_table();
 		if (use_intel()) {
@@ -744,12 +753,13 @@ void __init mtrr_bp_init(void)
 				mtrr_if->set_all();
 			}
 		}
-	}
+	} else
+		pr_info("mtrr: system does not support MTRR\n");
 'pr_warn' ? 
quoted hunk
 }
 
 void mtrr_ap_init(void)
 {
-	if (!use_intel() || mtrr_aps_delayed_init)
+	if (!use_intel() || mtrr_aps_delayed_init || !mtrr_enabled)
 		return;
 	/*
 	 * Ideally we should hold mtrr_mutex here to avoid mtrr entries
@@ -774,6 +784,9 @@ void mtrr_save_state(void)
 {
 	int first_cpu;
 
+	if (!mtrr_enabled)
+		return;
+
 	get_online_cpus();
 	first_cpu = cpumask_first(cpu_online_mask);
 	smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
@@ -782,7 +795,7 @@ void mtrr_save_state(void)
 
 void set_mtrr_aps_delayed_init(void)
 {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
 		return;
 
 	mtrr_aps_delayed_init = true;
@@ -810,7 +823,7 @@ void mtrr_aps_init(void)
 
 void mtrr_bp_restore(void)
 {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
 		return;
 
 	mtrr_if->set_all();
@@ -818,7 +831,7 @@ void mtrr_bp_restore(void)
 
 static int __init mtrr_init_finialize(void)
 {
-	if (!mtrr_if)
+	if (!mtrr_enabled)
 		return 0;
 
 	if (use_intel()) {
-- 
2.3.2.209.gd67f9d5.dirty

Re: [Xen-devel] [PATCH v1 04/47] pci: add pci_ioremap_wc_bar()

From: Konrad Rzeszutek Wilk <hidden>
Date: 2015-03-25 20:04:33

On Fri, Mar 20, 2015 at 04:17:54PM -0700, Luis R. Rodriguez wrote:
From: "Luis R. Rodriguez" <redacted>

This lets drivers take advanate of PAT when available. This
s/advanate/advantage/
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache() (de33c442e)
Please mention the title of the patch too:

"x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()"
quoted hunk
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..6afd507 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 				     pci_resource_len(pdev, bar));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+	/*
+	 * Make sure the BAR is actually a memory resource, not an IO resource
+	 */
+	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+		WARN_ON(1);
Would it be better to use dev_warn ? That way you can see which BDF it is?

Thought WARN will give a nice stack-trace that should easily point to the
driver so perhaps not.. Either way - up to you.
quoted hunk
+		return NULL;
+	}
+	return ioremap_wc(pci_resource_start(pdev, bar),
+			  pci_resource_len(pdev, bar));
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar);
 #endif
 
 #define PCI_FIND_CAP_TTL	48
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 211e9da..c235b09 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1667,6 +1667,7 @@ static inline void pci_mmcfg_late_init(void) { }
 int pci_ext_cfg_avail(void);
 
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar);
 
 #ifdef CONFIG_PCI_IOV
 int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
-- 
2.3.2.209.gd67f9d5.dirty


_______________________________________________
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Xen-devel@lists.xen.org
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Re: [PATCH v1 04/47] pci: add pci_ioremap_wc_bar()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-25 20:06:41

On Fri, Mar 20, 2015 at 04:50:32PM -0700, Andy Lutomirski wrote:
On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

This lets drivers take advanate of PAT when available. This
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache() (de33c442e)

Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..6afd507 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
                                     pci_resource_len(pdev, bar));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+       /*
+        * Make sure the BAR is actually a memory resource, not an IO resource
+        */
+       if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+               WARN_ON(1);
+               return NULL;
+       }
if (WARN_ON(...))?
Sure, they are equivalent however this follows the same exact style as
pci_ioremap_bar() so if we change this one might as well change the style of
pci_ioremap_bar() as well. Let me know if there is any preference. I personally
don't mind the extra line as it shortens the check.

 Luis

Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Konrad Rzeszutek Wilk <hidden>
Date: 2015-03-25 20:11:07

On Fri, Mar 20, 2015 at 04:17:55PM -0700, Luis R. Rodriguez wrote:
From: "Luis R. Rodriguez" <redacted>

This allows drivers to take advantage of write-combining
when possible. Ideally we'd have pci_read_bases() just
peg an IORESOURCE_WC flag for us but where exactly
video devices memory lie varies *largely* and at times things
are mixed with MMIO registers, sometimes we can address
the changes in drivers, other times the change requires
intrusive changes.

Although there is also arch_phys_wc_add() that makes use of
architecture specific write-combinging alternatives (MTRR on
combinging?
quoted hunk
x86 when a system does not have PAT) we void polluting
pci_iomap() space with it and force drivers and subsystems
that want to use it to be explicit.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
 include/asm-generic/pci_iomap.h | 14 ++++++++++
 lib/pci_iomap.c                 | 61 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index 7389c87..b1e17fc 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h
@@ -15,9 +15,13 @@ struct pci_dev;
 #ifdef CONFIG_PCI
 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
+extern void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max);
 extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
 				     unsigned long offset,
 				     unsigned long maxlen);
+extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
+					unsigned long offset,
+					unsigned long maxlen);
 /* Create a virtual mapping cookie for a port on a given PCI device.
  * Do not call this directly, it exists to make it easier for architectures
  * to override */
@@ -34,12 +38,22 @@ static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned lon
 	return NULL;
 }
 
+static inline void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max)
+{
+	return NULL;
+}
 static inline void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
 					    unsigned long offset,
 					    unsigned long maxlen)
 {
 	return NULL;
 }
+static inline void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
+					       unsigned long offset,
+					       unsigned long maxlen)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __ASM_GENERIC_IO_H */
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index bcce5f1..30b65ae 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -52,6 +52,46 @@ void __iomem *pci_iomap_range(struct pci_dev *dev,
 EXPORT_SYMBOL(pci_iomap_range);
 
 /**
+ * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @offset: map memory at the given offset in BAR
+ * @maxlen: max length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way. When possible write combining
+ * is used.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR from offset to the end, pass %0 here.
s/%0/0 ? Or is that some special syntax?
quoted hunk
+ * */
+void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
+				 int bar,
+				 unsigned long offset,
+				 unsigned long maxlen)
+{
+	resource_size_t start = pci_resource_start(dev, bar);
+	resource_size_t len = pci_resource_len(dev, bar);
+	unsigned long flags = pci_resource_flags(dev, bar);
+
+	if (len <= offset || !start)
+		return NULL;
+	len -= offset;
+	start += offset;
+	if (maxlen && len > maxlen)
+		len = maxlen;
+	if (flags & IORESOURCE_IO)
+		return __pci_ioport_map(dev, start, len);
+	if (flags & IORESOURCE_MEM)
+		return ioremap_wc(start, len);
+	/* What? */
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
+
+/**
  * pci_iomap - create a virtual mapping cookie for a PCI BAR
  * @dev: PCI device that owns the BAR
  * @bar: BAR number
@@ -70,4 +110,25 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
 	return pci_iomap_range(dev, bar, 0, maxlen);
 }
 EXPORT_SYMBOL(pci_iomap);
+
+/**
+ * pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @maxlen: length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way. When possible write combining
+ * is used.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR without checking for its length first, pass %0 here.
+ * */
+void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+	return pci_iomap_wc_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL_GPL(pci_iomap_wc);
 #endif /* CONFIG_PCI */
-- 
2.3.2.209.gd67f9d5.dirty

Re: [Xen-devel] [PATCH v1 04/47] pci: add pci_ioremap_wc_bar()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-25 20:39:24

On Wed, Mar 25, 2015 at 04:03:46PM -0400, Konrad Rzeszutek Wilk wrote:
On Fri, Mar 20, 2015 at 04:17:54PM -0700, Luis R. Rodriguez wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

This lets drivers take advanate of PAT when available. This
s/advanate/advantage/
Amended.
quoted
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache() (de33c442e)
Please mention the title of the patch too:

"x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()"
Added.
quoted
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <redacted>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..6afd507 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -137,6 +137,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 				     pci_resource_len(pdev, bar));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+	/*
+	 * Make sure the BAR is actually a memory resource, not an IO resource
+	 */
+	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+		WARN_ON(1);
Would it be better to use dev_warn ? That way you can see which BDF it is?

Thought WARN will give a nice stack-trace that should easily point to the
driver so perhaps not.. Either way - up to you.
I'm sticking to the style and use as with pci_ioremap_bar(). Whatever we pick
we should make both use the same. More information is always better and
since we do have dev_warn(), it would be nice to use that however within
its use on both pci_ioremap_wc_bar() and pci_ioremap_bar() we have
a use of the pdev with pci_resource_flags() and I believe if pdev is NULL
we'd get a NULL dereference (dev_driver_string() is used), so it would
seem it might be best to stick with a simple WARN_ON(). Arjan, any
preference? Obviously if pdev is NULL your driver is dumb but as folks
develop drivers this should be expected.

 Luis

Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Luis R. Rodriguez <hidden>
Date: 2015-03-26 03:01:10

On Mon, Mar 23, 2015 at 12:20:47PM -0500, Bjorn Helgaas wrote:
Hi Luis,

This seems OK to me, 
Great.
but I'm curious about a few things.

On Fri, Mar 20, 2015 at 6:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

This allows drivers to take advantage of write-combining
when possible. Ideally we'd have pci_read_bases() just
peg an IORESOURCE_WC flag for us
We do set IORESOURCE_PREFETCH.  Do you mean something different?
I did not think we had a WC IORESOURCE flag. Are you saying that we can use
IORESOURCE_PREFETCH for that purpose? If so then great.  As I read a PCI BAR
can have PCI_BASE_ADDRESS_MEM_PREFETCH and when that's the case we peg
IORESOURCE_PREFETCH. That seems to be what I want indeed. Questions below.
quoted
 but where exactly
video devices memory lie varies *largely* and at times things
are mixed with MMIO registers, sometimes we can address
the changes in drivers, other times the change requires
intrusive changes.
What does a video device address have to do with this?  I do see that
if a BAR maps only a frame buffer, the device might be able to mark it
prefetchable, while if the BAR mapped both a frame buffer and some
registers, it might not be able to make it prefetchable.  But that
doesn't seem like it depends on the *address*.
I meant the offsets for each of those, either registers or framebuffer,
and that typically they are mixed (primarily on older devices), so indeed your
summary of the problem is what I meant. Let's remember that we are trying to
take advantage of PAT here when available and avoid MTRR in that case, do we
know that the same PCI BARs that have always historically used MTRRs had
IORESOURCE_PREFETCH set, is that a fair assumption ? I realize they are
different things -- but its precisely why I ask.
pci_iomap_range() already makes a cacheable mapping if
IORESOURCE_CACHEABLE; I'm guessing that you would like it to
automatically use WC if the BAR if IORESOURCE_PREFETCH, e.g.,

  if (flags & IORESOURCE_CACHEABLE)
    return ioremap(start, len);
  if (flags & IORESOURCE_PREFETCH)
    return ioremap_wc(start, len);
  return ioremap_nocache(start, len);
Indeed, that's exactly what I think we should strive towards.
Is there a reason not to do that?
This depends on the exact defintion of IORESOURCE_PREFETCH and
PCI_BASE_ADDRESS_MEM_PREFETCH and how they are used all over and
accross *all devices*. This didn't look promising for starters:

include/uapi/linux/pci_regs.h:#define  PCI_BASE_ADDRESS_MEM_PREFETCH    0x08    /* prefetchable? */

PCI_BASE_ADDRESS_MEM_PREFETCH seems to be BAR specific, so a few questions:

1) Can we rest assured for instance that if we check for
PCI_BASE_ADDRESS_MEM_PREFETCH and if set that it will *only* be set on a full
PCI BAR if the full PCI BAR does want WC? If not this can regress
functionality. That seems risky. It however would not be risky if we used
another API that did look for IORESOURCE_PREFETCH and if so use ioremap_wc() --
that way only drivers we know that do use the full PCI bar would use this API.
There's a bit of a problem with this though:

2) Do we know that if a *full PCI BAR* is used for WC that
PCI_BASE_ADDRESS_MEM_PREFETCH *was* definitely set for the PCI BAR? If so then
the API usage would be restricted only to devices that we know *do* adhere to
this. That reduces the possible uses for older drivers and can create
regressions if used loosely without verification... but..

3) If from now on we get folks to commit to uset PCI_BASE_ADDRESS_MEM_PREFETCH
for full PCI BARs that do want WC perhaps newer devices / drivers will use
this very consistently ? Can we bank on that and is it worth it ?

4) If a PCI BAR *does not* have PCI_BASE_ADDRESS_MEM_PREFETCH do we know it
must not never want WC ?

If we don't have certainty on any of the above I'm afraid we can't do much
right now but perhaps we can push towards better use of PCI_BASE_ADDRESS_MEM_PREFETCH
and hope folks will only use this for the full PCI BAR only if WC is desired.

Thoughts?
quoted
Although there is also arch_phys_wc_add() that makes use of
architecture specific write-combinging alternatives (MTRR on
x86 when a system does not have PAT) we void polluting
pci_iomap() space with it and force drivers and subsystems
that want to use it to be explicit.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)
...
quoted
+void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
+                                int bar,
+                                unsigned long offset,
+                                unsigned long maxlen)
+{
+       resource_size_t start = pci_resource_start(dev, bar);
+       resource_size_t len = pci_resource_len(dev, bar);
+       unsigned long flags = pci_resource_flags(dev, bar);
+
+       if (len <= offset || !start)
+               return NULL;
+       len -= offset;
+       start += offset;
+       if (maxlen && len > maxlen)
+               len = maxlen;
+       if (flags & IORESOURCE_IO)
+               return __pci_ioport_map(dev, start, len);
+       if (flags & IORESOURCE_MEM)
Should we log a note in dmesg if the BAR is *not* IORESOURCE_PREFETCH?
 I know the driver might know it's safe even if the device didn't mark
the BAR as prefetchable, but it does seem like an easy way for a
driver to shoot itself in the foot.
You tell me. I would fear this may not be consistent and we'd end up
having bug reports open for something that has historically been a
non-issue. The above questions can help us gauge the risk of this.

  Luis

Re: [PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

From: Juergen Gross <jgross@suse.com>
Date: 2015-03-26 04:38:33

On 03/25/2015 08:59 PM, Konrad Rzeszutek Wilk wrote:
On Fri, Mar 20, 2015 at 04:17:52PM -0700, Luis R. Rodriguez wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

It is possible to enable CONFIG_MTRR and up with it
disabled at run time and yet CONFIG_X86_PAT continues
to kick through fully functionally. This can happen
s/fully/full/ ?

quoted
for instance on Xen where MTRR is not supported but
PAT is, this can happen now on Linux as of commit
47591df50 by Juergen introduced as of v3.19.
s/3.19/4.0/
No, 3.19 is correct.

Juergen
quoted
Technically we should assume the proper CPU
bits would be set to disable MTRR but we can't
always rely on this. At least on the Xen Hypervisor
for instance only X86_FEATURE_MTRR was disabled
as of Xen 4.4 through Xen commit 586ab6a [0],
but not X86_FEATURE_K6_MTRR, X86_FEATURE_CENTAUR_MCR,
or X86_FEATURE_CYRIX_ARR for instance.
Oh, could you send an patch for that to Xen please?
quoted
x86 mtrr code relies on quite a bit of checks for
mtrr_if being set to check to see if MTRR did get
set up, instead of using that lets provide a generic
setter which when set we know MTRR is enabled. This
s/we know MTRR is enabled/will let us know that MTRR is enabled/
quoted
also adds a few checks where they were not before
which could potentially safeguard ourselves against
incorrect usage of MTRR where this was not desirable.

Where possible match error codes as if MTRR was
disabled on arch/x86/include/asm/mtrr.h.

Lastly, since disabling MTRR can happen at run time
and we could end up with PAT enabled best record now
on our logs when MTRR is disabled.

[0] ~/devel/xen (git::stable-4.5)$ git describe --contains 586ab6a
4.4.0-rc1~18

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Suresh Siddha <redacted>
Cc: Venkatesh Pallipadi <redacted>
Cc: Ingo Molnar <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <redacted>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <redacted>
Cc: Tomi Valkeinen <redacted>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: venkatesh.pallipadi@intel.com
Cc: Stefan Bader <redacted>
Cc: konrad.wilk@oracle.com
Cc: ville.syrjala@linux.intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: toshi.kani@hp.com
Cc: bhelgaas@google.com
Cc: Roger Pau Monné <redacted>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: xen-devel@lists.xensource.com
Signed-off-by: Luis R. Rodriguez <redacted>
---
  arch/x86/include/asm/mtrr.h        |  2 ++
  arch/x86/kernel/cpu/mtrr/cleanup.c |  2 +-
  arch/x86/kernel/cpu/mtrr/generic.c |  5 +++--
  arch/x86/kernel/cpu/mtrr/if.c      |  3 +++
  arch/x86/kernel/cpu/mtrr/main.c    | 31 ++++++++++++++++++++++---------
  5 files changed, 31 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index f768f62..cade917 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -31,6 +31,7 @@
   * arch_phys_wc_add and arch_phys_wc_del.
   */
  # ifdef CONFIG_MTRR
+extern int mtrr_enabled;
  extern u8 mtrr_type_lookup(u64 addr, u64 end);
  extern void mtrr_save_fixed_ranges(void *);
  extern void mtrr_save_state(void);
@@ -50,6 +51,7 @@ extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
  extern int amd_special_default_mtrr(void);
  extern int phys_wc_to_mtrr_index(int handle);
  #  else
+static const int mtrr_enabled;
  static inline u8 mtrr_type_lookup(u64 addr, u64 end)
  {
  	/*
diff --git a/arch/x86/kernel/cpu/mtrr/cleanup.c b/arch/x86/kernel/cpu/mtrr/cleanup.c
index 5f90b85..784dc55 100644
--- a/arch/x86/kernel/cpu/mtrr/cleanup.c
+++ b/arch/x86/kernel/cpu/mtrr/cleanup.c
@@ -880,7 +880,7 @@ int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
  	 * Make sure we only trim uncachable memory on machines that
  	 * support the Intel MTRR architecture:
  	 */
-	if (!is_cpu(INTEL) || disable_mtrr_trim)
+	if (!is_cpu(INTEL) || disable_mtrr_trim || !mtrr_enabled)
  		return 0;

  	rdmsr(MSR_MTRRdefType, def, dummy);
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 09c82de..df321b2 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -116,7 +116,8 @@ static u8 __mtrr_type_lookup(u64 start, u64 end, u64 *partial_end, int *repeat)
  	u8 prev_match, curr_match;

  	*repeat = 0;
-	if (!mtrr_state_set)
+	/* generic_mtrr_ops is only set for generic_mtrr_ops */
+	if (!mtrr_state_set || !mtrr_enabled)
  		return 0xFF;

  	if (!mtrr_state.enabled)
@@ -290,7 +291,7 @@ static void get_fixed_ranges(mtrr_type *frs)

  void mtrr_save_fixed_ranges(void *info)
  {
-	if (cpu_has_mtrr)
+	if (mtrr_enabled && cpu_has_mtrr)
  		get_fixed_ranges(mtrr_state.fixed_ranges);
  }
diff --git a/arch/x86/kernel/cpu/mtrr/if.c b/arch/x86/kernel/cpu/mtrr/if.c
index d76f13d..e9e001a 100644
--- a/arch/x86/kernel/cpu/mtrr/if.c
+++ b/arch/x86/kernel/cpu/mtrr/if.c
@@ -436,6 +436,9 @@ static int __init mtrr_if_init(void)
  {
  	struct cpuinfo_x86 *c = &boot_cpu_data;

+	if (!mtrr_enabled)
+		return 0;
+
  	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
  	    (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
  	    (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index ea5f363..7db9c47 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -59,6 +59,7 @@
  #define MTRR_TO_PHYS_WC_OFFSET 1000

  u32 num_var_ranges;
+int mtrr_enabled;

  unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
  static DEFINE_MUTEX(mtrr_mutex);
@@ -84,6 +85,9 @@ static int have_wrcomb(void)
  {
  	struct pci_dev *dev;

+	if (!mtrr_enabled)
+		return 0;
+
  	dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL);
  	if (dev != NULL) {
  		/*
@@ -286,7 +290,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
  	int i, replace, error;
  	mtrr_type ltype;

-	if (!mtrr_if)
+	if (!mtrr_enabled)
  		return -ENXIO;

  	error = mtrr_if->validate_add_page(base, size, type);
@@ -388,6 +392,8 @@ int mtrr_add_page(unsigned long base, unsigned long size,

  static int mtrr_check(unsigned long base, unsigned long size)
  {
+	if (!mtrr_enabled)
+		return -ENODEV;
  	if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
  		pr_warning("mtrr: size and base must be multiples of 4 kiB\n");
  		pr_debug("mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
@@ -463,8 +469,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
  	unsigned long lbase, lsize;
  	int error = -EINVAL;

-	if (!mtrr_if)
-		return -ENXIO;
+	if (!mtrr_enabled)
+		return -ENODEV;

  	max = num_var_ranges;
  	/* No CPU hotplug when we change MTRR entries */
@@ -523,6 +529,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
   */
  int mtrr_del(int reg, unsigned long base, unsigned long size)
  {
+	if (!mtrr_enabled)
+		return -ENODEV;
  	if (mtrr_check(base, size))
  		return -EINVAL;
  	return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
@@ -545,7 +553,7 @@ int arch_phys_wc_add(unsigned long base, unsigned long size)
  {
  	int ret;

-	if (pat_enabled)
+	if (pat_enabled || !mtrr_enabled)
  		return 0;  /* Success!  (We don't need to do anything.) */

  	ret = mtrr_add(base, size, MTRR_TYPE_WRCOMB, true);
@@ -734,6 +742,7 @@ void __init mtrr_bp_init(void)
  	}

  	if (mtrr_if) {
+		mtrr_enabled = true;
  		set_num_var_ranges();
  		init_table();
  		if (use_intel()) {
@@ -744,12 +753,13 @@ void __init mtrr_bp_init(void)
  				mtrr_if->set_all();
  			}
  		}
-	}
+	} else
+		pr_info("mtrr: system does not support MTRR\n");
  'pr_warn' ?
quoted
  }

  void mtrr_ap_init(void)
  {
-	if (!use_intel() || mtrr_aps_delayed_init)
+	if (!use_intel() || mtrr_aps_delayed_init || !mtrr_enabled)
  		return;
  	/*
  	 * Ideally we should hold mtrr_mutex here to avoid mtrr entries
@@ -774,6 +784,9 @@ void mtrr_save_state(void)
  {
  	int first_cpu;

+	if (!mtrr_enabled)
+		return;
+
  	get_online_cpus();
  	first_cpu = cpumask_first(cpu_online_mask);
  	smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1);
@@ -782,7 +795,7 @@ void mtrr_save_state(void)

  void set_mtrr_aps_delayed_init(void)
  {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
  		return;

  	mtrr_aps_delayed_init = true;
@@ -810,7 +823,7 @@ void mtrr_aps_init(void)

  void mtrr_bp_restore(void)
  {
-	if (!use_intel())
+	if (!use_intel() || !mtrr_enabled)
  		return;

  	mtrr_if->set_all();
@@ -818,7 +831,7 @@ void mtrr_bp_restore(void)

  static int __init mtrr_init_finialize(void)
  {
-	if (!mtrr_if)
+	if (!mtrr_enabled)
  		return 0;

  	if (use_intel()) {
--
2.3.2.209.gd67f9d5.dirty
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Re: [PATCH v1 02/47] x86: mtrr: generalize run time disabling of MTRR

From: Luis R. Rodriguez <hidden>
Date: 2015-03-26 23:36:03

On Wed, Mar 25, 2015 at 03:59:41PM -0400, Konrad Rzeszutek Wilk wrote:
On Fri, Mar 20, 2015 at 04:17:52PM -0700, Luis R. Rodriguez wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

It is possible to enable CONFIG_MTRR and up with it
disabled at run time and yet CONFIG_X86_PAT continues
to kick through fully functionally. This can happen
s/fully/full/ ?
I'll rephrase this to:

---
It is possible to enable CONFIG_MTRR and up with it
disabled at run time and yet CONFIG_X86_PAT continues
to kick through with all functionally enabled. This
can happen for instance on Xen where MTRR is not
supported but PAT is, this can happen now on Linux as
of commit 47591df50 by Juergen introduced as of v3.19.
---

Which BTW I had also mentioned on the cover letter that
this is a good time to address if we want to make PAT
then a first class citizen, to detangle it from depending
on MTRR. If so I can do that later.
quoted
Technically we should assume the proper CPU
bits would be set to disable MTRR but we can't
always rely on this. At least on the Xen Hypervisor
for instance only X86_FEATURE_MTRR was disabled
as of Xen 4.4 through Xen commit 586ab6a [0],
but not X86_FEATURE_K6_MTRR, X86_FEATURE_CENTAUR_MCR,
or X86_FEATURE_CYRIX_ARR for instance.
Oh, could you send an patch for that to Xen please?
Done.
quoted
x86 mtrr code relies on quite a bit of checks for
mtrr_if being set to check to see if MTRR did get
set up, instead of using that lets provide a generic
setter which when set we know MTRR is enabled. This
s/we know MTRR is enabled/will let us know that MTRR is enabled/
Amended.

  Luis

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Ville Syrjälä <syrjala@sci.fi>
Date: 2015-03-27 08:37:17

On Sat, Mar 21, 2015 at 11:15:14AM +0200, Ville Syrjälä wrote:
On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)
 
 #ifdef CONFIG_MTRR
 	par->mtrr_aper = -1;
-	par->mtrr_reg = -1;
 	if (!nomtrr) {
-		/* Cover the whole resource. */
-		par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+		par->mtrr_aper = mtrr_add(info->fix.smem_start,
+					  info->fix.smem_len,
 					  MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
Still waiting for an answer...
quoted
-		if (par->mtrr_aper >= 0 && !par->aux_start) {
-			/* Make a hole for mmio. */
-			par->mtrr_reg = mtrr_add(par->res_start + 0x800000 -
-						 GUI_RESERVE, GUI_RESERVE,
-						 MTRR_TYPE_UNCACHABLE, 1);
-			if (par->mtrr_reg < 0) {
-				mtrr_del(par->mtrr_aper, 0, 0);
-				par->mtrr_aper = -1;
-			}
-		}
 	}
 #endif
 
@@ -2776,10 +2765,6 @@ aty_init_exit:
 	par->pll_ops->set_pll(info, &par->saved_pll);
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
@@ -3466,7 +3451,7 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	}
 
 	info->fix.mmio_start = raddr;
-	par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+	par->ati_regbase = ioremap_nocache(info->fix.mmio_start, 0x1000);
 	if (par->ati_regbase = NULL)
 		return -ENOMEM;
 
@@ -3491,6 +3476,8 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
 	info->fix.smem_start = addr;
 	info->fix.smem_len = 0x800000;
 
+	aty_fudge_framebuffer_len(info);
+
 	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 	if (info->screen_base = NULL) {
 		ret = -ENOMEM;
@@ -3563,6 +3550,7 @@ static int atyfb_pci_probe(struct pci_dev *pdev,
 		return -ENOMEM;
 	}
 	par = info->par;
+	par->bus_type = PCI;
 	info->fix = atyfb_fix;
 	info->device = &pdev->dev;
 	par->pci_id = pdev->device;
@@ -3732,10 +3720,6 @@ static void atyfb_remove(struct fb_info *info)
 #endif
 
 #ifdef CONFIG_MTRR
-	if (par->mtrr_reg >= 0) {
-		mtrr_del(par->mtrr_reg, 0, 0);
-		par->mtrr_reg = -1;
-	}
 	if (par->mtrr_aper >= 0) {
 		mtrr_del(par->mtrr_aper, 0, 0);
 		par->mtrr_aper = -1;
-- 
2.3.2.209.gd67f9d5.dirty

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-- 
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-- 
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Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 18:40:34

On Wed, Mar 25, 2015 at 04:07:43PM -0400, Konrad Rzeszutek Wilk wrote:
On Fri, Mar 20, 2015 at 04:17:55PM -0700, Luis R. Rodriguez wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

This allows drivers to take advantage of write-combining
when possible. Ideally we'd have pci_read_bases() just
peg an IORESOURCE_WC flag for us but where exactly
video devices memory lie varies *largely* and at times things
are mixed with MMIO registers, sometimes we can address
the changes in drivers, other times the change requires
intrusive changes.

Although there is also arch_phys_wc_add() that makes use of
architecture specific write-combinging alternatives (MTRR on
combinging?
Amended.
quoted
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index bcce5f1..30b65ae 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -52,6 +52,46 @@ void __iomem *pci_iomap_range(struct pci_dev *dev,
 EXPORT_SYMBOL(pci_iomap_range);
 
 /**
+ * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @offset: map memory at the given offset in BAR
+ * @maxlen: max length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way. When possible write combining
+ * is used.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR from offset to the end, pass %0 here.
s/%0/0 ? Or is that some special syntax?
This copies the syntax of pci_iomap_range() which also uses %0, and as per
Documentation/kernel-doc-nano-HOWTO.txt % is used for constants. See:

scripts/kernel-doc -man -function pci_iomap_range lib/pci_iomap.c | nroff -man | less

  Luis

Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

From: Toshi Kani <hidden>
Date: 2015-03-27 19:36:56

On Mon, 2015-03-23 at 12:20 -0500, Bjorn Helgaas wrote:
 :
pci_iomap_range() already makes a cacheable mapping if
IORESOURCE_CACHEABLE; I'm guessing that you would like it to
automatically use WC if the BAR if IORESOURCE_PREFETCH, e.g.,

  if (flags & IORESOURCE_CACHEABLE)
    return ioremap(start, len);
Is this supposed to be ioremap_cache()?  ioremap() is the same as
ioremap_nocache() at least on x86 per arch/x86/include/asm/io.h.
  if (flags & IORESOURCE_PREFETCH)
    return ioremap_wc(start, len);
  return ioremap_nocache(start, len);
-Toshi

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 19:38:20

On Sat, Mar 21, 2015 at 11:15:14AM +0200, Ville Syrjälä wrote:
On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)
 
 #ifdef CONFIG_MTRR
 	par->mtrr_aper = -1;
-	par->mtrr_reg = -1;
 	if (!nomtrr) {
-		/* Cover the whole resource. */
-		par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+		par->mtrr_aper = mtrr_add(info->fix.smem_start,
+					  info->fix.smem_len,
 					  MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
As per mtrr_add_page() [0] the base and size are just supposed to be in units
of 4 KiB, although the practice is to use powers of 2 in *some* drivers this
is not standardized and by no means recorded as a requirement. Obviously
powers of 2 will work too and you'd end up neatly aligned as well. mtrr_add()
will use mtrr_check() to verify the the same requirement. Furthermore,
as per my commit log message:

---
    The last thing we do must do to remain sane is ensure we
    use the info->fix.smem_start and info->fix.smem_len for
    the framebuffer MTRR as we know that is always well adjusted.
    The *one* concern here would be if the MTRR is not in units
    of 4K __but__ we already know that in the PCI case this cannot
    happen, in the shared space setting the MTRR would be up to
    0x7ff000 and assuming a 4K page:
    
    ; 0x7ff000 / 0x1000
        2047
    
    Also, internally when MTRR is used mtrr_add() will use mtrr_check()
    and that should splat a warning when the MTRR base and size are
    not compatible with what is expected for MTRR usage.
---

If any of this is too risky we can use the __arch_phys_wc_add() (or as
Andy suggested perhaps use set_page_* stuff, although I am still evaluating
this) but I did this change to show the effort required for a change when
the registers / framebuffer is on the same PCI BAR but at different offsets.

[0] scripts/kernel-doc -man -function mtrr_add_page arch/x86/kernel/cpu/mtrr/main.c | nroff -man | less

  Luis

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 19:39:01

On Fri, Mar 27, 2015 at 10:37:04AM +0200, Ville Syrjälä wrote:
On Sat, Mar 21, 2015 at 11:15:14AM +0200, Ville Syrjälä wrote:
quoted
On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)
 
 #ifdef CONFIG_MTRR
 	par->mtrr_aper = -1;
-	par->mtrr_reg = -1;
 	if (!nomtrr) {
-		/* Cover the whole resource. */
-		par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+		par->mtrr_aper = mtrr_add(info->fix.smem_start,
+					  info->fix.smem_len,
 					  MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
Still waiting for an answer...
Sorry was in the desert for a bit, I'm back now.

  Luis

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-27 19:44:23

On Fri, Mar 27, 2015 at 12:38 PM, Luis R. Rodriguez [off-list ref] wrote:
On Sat, Mar 21, 2015 at 11:15:14AM +0200, Ville Syrjälä wrote:
quoted
On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)

 #ifdef CONFIG_MTRR
    par->mtrr_aper = -1;
-   par->mtrr_reg = -1;
    if (!nomtrr) {
-           /* Cover the whole resource. */
-           par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+           par->mtrr_aper = mtrr_add(info->fix.smem_start,
+                                     info->fix.smem_len,
                                      MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
As per mtrr_add_page() [0] the base and size are just supposed to be in units
of 4 KiB, although the practice is to use powers of 2 in *some* drivers this
is not standardized and by no means recorded as a requirement. Obviously
powers of 2 will work too and you'd end up neatly aligned as well. mtrr_add()
will use mtrr_check() to verify the the same requirement. Furthermore,
as per my commit log message:
Whatever the code may or may not do, the x86 architecture uses
power-of-two MTRR sizes.  So I'm confused.

--Andy
---
    The last thing we do must do to remain sane is ensure we
    use the info->fix.smem_start and info->fix.smem_len for
    the framebuffer MTRR as we know that is always well adjusted.
    The *one* concern here would be if the MTRR is not in units
    of 4K __but__ we already know that in the PCI case this cannot
    happen, in the shared space setting the MTRR would be up to
    0x7ff000 and assuming a 4K page:

    ; 0x7ff000 / 0x1000
        2047

    Also, internally when MTRR is used mtrr_add() will use mtrr_check()
    and that should splat a warning when the MTRR base and size are
    not compatible with what is expected for MTRR usage.
---

If any of this is too risky we can use the __arch_phys_wc_add() (or as
Andy suggested perhaps use set_page_* stuff, although I am still evaluating
this) but I did this change to show the effort required for a change when
the registers / framebuffer is on the same PCI BAR but at different offsets.

[0] scripts/kernel-doc -man -function mtrr_add_page arch/x86/kernel/cpu/mtrr/main.c | nroff -man | less

  Luis


-- 
Andy Lutomirski
AMA Capital Management, LLC

Re: [PATCH v1 06/47] mtrr: add __arch_phys_wc_add()

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 19:53:58

On Fri, Mar 20, 2015 at 04:48:46PM -0700, Andy Lutomirski wrote:
On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

Ideally on systems using PAT we can expect a swift
transition away from MTRR. There can be a few exceptions
to this, one is where device drivers are known to exist
on PATs with errata, another situation is observed on
old device drivers where devices had combined MMIO
register access with whatever area they typically
later wanted to end up using MTRR for on the same
PCI BAR. This situation can still be addressed by
splitting up ioremap'd PCI BAR into two ioremap'd
calls, one for MMIO registers, and another for whatever
is desirable for write-combining -- in order to
accomplish this though quite a bit of driver
restructuring is required.

Device drivers which are known to require large
amount of re-work in order to split ioremap'd areas
can use __arch_phys_wc_add() to avoid regressions
when PAT is enabled.

For a good example driver where things are neatly
split up on a PCI BAR refer the infiniband qib
driver. For a good example of a driver where good
amount of work is required refer to the infiniband
ipath driver.

This is *only* a transitive API -- and as such no new
drivers are ever expected to use this.
What's the exact layout that this helps?  I'm sceptical that this can
ever be correct.

Is there some awful driver that has a large ioremap that's supposed to
contain multiple different memtypes? 
Yes, I cc'd you just now on one where I made changes on a driver which uses one
PCI with mixed memtypes and uses MTRR to hole in WC. A transition to
arch_phys_wc_add() is therefore not possible if PAT is enabled as it would
regress those drivers by making the MTRR WC hole trick non functional.
The changes are non trivial and so in this series I supplied changes on
one driver only to show the effort required. The other drivers which
required this were:

Driver		File
------------------------------------------------------------
fusion		drivers/message/fusion/mptbase.c
ivtv		drivers/media/pci/ivtv/ivtvfb.c
ipath		drivers/infiniband/hw/ipath/ipath_driver.c

This series makes those drivers use __arch_phys_wc_add() more as a
transitory phase in hopes we can address the proper split as with the
atyfb illustrates. For ipath the changes required have a nice template
with the qib driver as they share very similar driver structure, the
qib driver *did* do the nice split.
If so, can we ioremap + set_page_xyz instead?
I'm not sure I see which call we'd use.  Care to provide an example patch
alternative for the atyfb as a case in point alternative to the work required
to do the split?

  Luis

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 19:58:04

On Fri, Mar 27, 2015 at 12:43:55PM -0700, Andy Lutomirski wrote:
On Fri, Mar 27, 2015 at 12:38 PM, Luis R. Rodriguez [off-list ref] wrote:
quoted
On Sat, Mar 21, 2015 at 11:15:14AM +0200, Ville Syrjälä wrote:
quoted
On Fri, Mar 20, 2015 at 04:17:59PM -0700, Luis R. Rodriguez wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)

 #ifdef CONFIG_MTRR
    par->mtrr_aper = -1;
-   par->mtrr_reg = -1;
    if (!nomtrr) {
-           /* Cover the whole resource. */
-           par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+           par->mtrr_aper = mtrr_add(info->fix.smem_start,
+                                     info->fix.smem_len,
                                      MTRR_TYPE_WRCOMB, 1);
MTRRs need power of two size, so how is this supposed to work?
As per mtrr_add_page() [0] the base and size are just supposed to be in units
of 4 KiB, although the practice is to use powers of 2 in *some* drivers this
is not standardized and by no means recorded as a requirement. Obviously
powers of 2 will work too and you'd end up neatly aligned as well. mtrr_add()
will use mtrr_check() to verify the the same requirement. Furthermore,
as per my commit log message:
Whatever the code may or may not do, the x86 architecture uses
power-of-two MTRR sizes.  So I'm confused.
There should be no confusion, I simply did not know that *was* the
requirement for x86, if that is the case we should add a check for that
and perhaps generalize a helper that does the power of two helper changes,
the cleanest I found was the vesafb driver solution.

Thoughts?

 Luis

Re: [PATCH v1 06/47] mtrr: add __arch_phys_wc_add()

From: Andy Lutomirski <luto@amacapital.net>
Date: 2015-03-27 19:58:30

On Fri, Mar 27, 2015 at 12:53 PM, Luis R. Rodriguez [off-list ref] wrote:
On Fri, Mar 20, 2015 at 04:48:46PM -0700, Andy Lutomirski wrote:
quoted
On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
From: "Luis R. Rodriguez" <redacted>

Ideally on systems using PAT we can expect a swift
transition away from MTRR. There can be a few exceptions
to this, one is where device drivers are known to exist
on PATs with errata, another situation is observed on
old device drivers where devices had combined MMIO
register access with whatever area they typically
later wanted to end up using MTRR for on the same
PCI BAR. This situation can still be addressed by
splitting up ioremap'd PCI BAR into two ioremap'd
calls, one for MMIO registers, and another for whatever
is desirable for write-combining -- in order to
accomplish this though quite a bit of driver
restructuring is required.

Device drivers which are known to require large
amount of re-work in order to split ioremap'd areas
can use __arch_phys_wc_add() to avoid regressions
when PAT is enabled.

For a good example driver where things are neatly
split up on a PCI BAR refer the infiniband qib
driver. For a good example of a driver where good
amount of work is required refer to the infiniband
ipath driver.

This is *only* a transitive API -- and as such no new
drivers are ever expected to use this.
What's the exact layout that this helps?  I'm sceptical that this can
ever be correct.

Is there some awful driver that has a large ioremap that's supposed to
contain multiple different memtypes?
Yes, I cc'd you just now on one where I made changes on a driver which uses one
PCI with mixed memtypes and uses MTRR to hole in WC. A transition to
arch_phys_wc_add() is therefore not possible if PAT is enabled as it would
regress those drivers by making the MTRR WC hole trick non functional.
The changes are non trivial and so in this series I supplied changes on
one driver only to show the effort required. The other drivers which
required this were:

Driver          File
------------------------------------------------------------
fusion          drivers/message/fusion/mptbase.c
ivtv            drivers/media/pci/ivtv/ivtvfb.c
ipath           drivers/infiniband/hw/ipath/ipath_driver.c

This series makes those drivers use __arch_phys_wc_add() more as a
transitory phase in hopes we can address the proper split as with the
atyfb illustrates. For ipath the changes required have a nice template
with the qib driver as they share very similar driver structure, the
qib driver *did* do the nice split.
quoted
If so, can we ioremap + set_page_xyz instead?
I'm not sure I see which call we'd use.  Care to provide an example patch
alternative for the atyfb as a case in point alternative to the work required
to do the split?
I'm still confused.  Would it be insufficient to ioremap_nocache the
whole thing and then call set_memory_wc on parts of it?  (Sorry,
set_page_xyz was a typo.)

--Andy


-- 
Andy Lutomirski
AMA Capital Management, LLC

Re: [PATCH v1 09/47] vidoe: fbdev: atyfb: remove and fix MTRR MMIO "hole" work around

From: Luis R. Rodriguez <hidden>
Date: 2015-03-27 20:12:09

On Fri, Mar 20, 2015 at 04:52:18PM -0700, Andy Lutomirski wrote:
On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez
[off-list ref] wrote:
quoted
diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
index 8025624..8875e56 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -2630,21 +2630,10 @@ static int aty_init(struct fb_info *info)

 #ifdef CONFIG_MTRR
        par->mtrr_aper = -1;
-       par->mtrr_reg = -1;
        if (!nomtrr) {
-               /* Cover the whole resource. */
-               par->mtrr_aper = mtrr_add(par->res_start, par->res_size,
+               par->mtrr_aper = mtrr_add(info->fix.smem_start,
+                                         info->fix.smem_len,
                                          MTRR_TYPE_WRCOMB, 1);
-               if (par->mtrr_aper >= 0 && !par->aux_start) {
-                       /* Make a hole for mmio. */
-                       par->mtrr_reg = mtrr_add(par->res_start + 0x800000 -
-                                                GUI_RESERVE, GUI_RESERVE,
-                                                MTRR_TYPE_UNCACHABLE, 1);
-                       if (par->mtrr_reg < 0) {
-                               mtrr_del(par->mtrr_aper, 0, 0);
-                               par->mtrr_aper = -1;
-                       }
-               }
        }
 #endif
@@ -2776,10 +2765,6 @@ aty_init_exit:
        par->pll_ops->set_pll(info, &par->saved_pll);

 #ifdef CONFIG_MTRR
-       if (par->mtrr_reg >= 0) {
-               mtrr_del(par->mtrr_reg, 0, 0);
-               par->mtrr_reg = -1;
-       }
        if (par->mtrr_aper >= 0) {
                mtrr_del(par->mtrr_aper, 0, 0);
                par->mtrr_aper = -1;
@@ -3466,7 +3451,7 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
        }

        info->fix.mmio_start = raddr;
-       par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
+       par->ati_regbase = ioremap_nocache(info->fix.mmio_start, 0x1000);
Double-check me, but I think that ioremap_nocache + WC MTRR = WC. 
Precicely, in this case the WC hole was obtained by using MTRR WC. This
patch removes that WC hole trick and now we can be explciit about
only wanting ioremap_nocache() on the registers, that is WC is not
desired here and is not used. The patch does not highlight the fact
that there was left in place another ioremap() call for the framebuffer:

info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

That is the one that later after this patch we use ioremap_wc() for.
This patch just removes the hole solution. That's all.

  Luis
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