[PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

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Revision v1 of 2 in this series.

20 messages, 6 authors, 2012-07-10 · open the first message on its own page

[PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Scott Wood <hidden>
Date: 2012-06-27 23:49:01

The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also because
the generic qemu e500 platform wants a full list of FSL PCI compatibles
to check.

Scott Wood (3):
  powerpc/fsl-pci: get PCI init out of board files
  powerpc/e500: add paravirt QEMU platform
  powerpc/mpc85xx_ds: convert to unified PCI init

 arch/powerpc/platforms/85xx/Kconfig      |   16 +++++
 arch/powerpc/platforms/85xx/Makefile     |    1 +
 arch/powerpc/platforms/85xx/mpc85xx_ds.c |   97 +++++++++---------------------
 arch/powerpc/platforms/85xx/qemu_e500.c  |   66 ++++++++++++++++++++
 arch/powerpc/platforms/Kconfig.cputype   |    4 +
 arch/powerpc/sysdev/fsl_pci.c            |   66 ++++++++++++++++++++
 arch/powerpc/sysdev/fsl_pci.h            |    8 +++
 7 files changed, 190 insertions(+), 68 deletions(-)
 create mode 100644 arch/powerpc/platforms/85xx/qemu_e500.c

-- 
1.7.5.4

[PATCH 1/3] powerpc/fsl-pci: provide common PCI init

From: Scott Wood <hidden>
Date: 2012-06-27 23:50:14

As an alternative incremental starting point to Jia Hongtao's patchset,
get the FSL PCI init out of the board files, but do not yet convert to a
platform driver.

Rather than having each board supply a magic register offset for
determining the "primary" bus, we look for which PCI host bridge
contains an ISA node within its subtree.  If there is no ISA node,
normally that would mean there is no primary bus, but until certain
bugs are fixed we arbitrarily designate a primary in this case.

Conversion to a platform driver and related improvements can happen
after this, as the ordering issues are sorted out.

Signed-off-by: Scott Wood <redacted>
---
 arch/powerpc/sysdev/fsl_pci.c |   66 +++++++++++++++++++++++++++++++++++++++++
 arch/powerpc/sysdev/fsl_pci.h |    8 +++++
 2 files changed, 74 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 6073288..f61e407 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c

@@ -807,3 +807,69 @@ u64 fsl_pci_immrbar_base(struct pci_controller *hose)
 
 	return 0;
 }
+
+#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
+static const struct of_device_id pci_ids[] = {
+	{ .compatible = "fsl,mpc8540-pci", },
+	{ .compatible = "fsl,mpc8548-pcie", },
+	{ .compatible = "fsl,mpc8610-pci", },
+	{ .compatible = "fsl,mpc8641-pcie", },
+	{ .compatible = "fsl,p1022-pcie", },
+	{ .compatible = "fsl,p1010-pcie", },
+	{ .compatible = "fsl,p1023-pcie", },
+	{ .compatible = "fsl,p4080-pcie", },
+	{ .compatible = "fsl,qoriq-pcie-v2.3", },
+	{ .compatible = "fsl,qoriq-pcie-v2.2", },
+	{},
+};
+
+struct device_node *fsl_pci_primary;
+
+void __devinit fsl_pci_init(void)
+{
+	struct device_node *node;
+	struct pci_controller *hose;
+	dma_addr_t max = 0xffffffff;
+
+	/* If a PCI host bridge has an ISA node under it, it's primary. */
+	node = of_find_node_by_type(NULL, "isa");
+	while ((fsl_pci_primary = of_get_parent(node))) {
+		of_node_put(node);
+		node = fsl_pci_primary;
+
+		if (of_match_node(pci_ids, node))
+			break;
+	}
+
+	node = NULL;
+	for_each_node_by_type(node, "pci") {
+		if (of_match_node(pci_ids, node)) {
+			/*
+			 * If there's no PCI host bridge with ISA, arbitrarily
+			 * designate one as primary.  This can go away once
+			 * various bugs with primary-less systems are fixed.
+			 */
+			if (!fsl_pci_primary)
+				fsl_pci_primary = node;
+
+			fsl_add_bridge(node, fsl_pci_primary == node);
+			hose = pci_find_hose_for_OF_device(node);
+			max = min(max, hose->dma_window_base_cur +
+					hose->dma_window_size);
+		}
+	}
+
+#ifdef CONFIG_SWIOTLB
+	/*
+	 * if we couldn't map all of DRAM via the dma windows
+	 * we need SWIOTLB to handle buffers located outside of
+	 * dma capable memory region
+	 */
+	if (memblock_end_of_DRAM() - 1 > max) {
+		ppc_swiotlb_enable = 1;
+		set_pci_dma_ops(&swiotlb_dma_ops);
+		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
+	}
+#endif
+}
+#endif

diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index a39ed5c..baa0fd1 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h

@@ -93,5 +93,13 @@ extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
 extern int mpc83xx_add_bridge(struct device_node *dev);
 u64 fsl_pci_immrbar_base(struct pci_controller *hose);
 
+extern struct device_node *fsl_pci_primary;
+
+#ifdef CONFIG_FSL_PCI
+void fsl_pci_init(void);
+#else
+static inline void fsl_pci_init(void) {}
+#endif
+
 #endif /* __POWERPC_FSL_PCI_H */
 #endif /* __KERNEL__ */

-- 
1.7.5.4

[PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Scott Wood <hidden>
Date: 2012-06-27 23:50:16

This gives the kernel a paravirtualized machine to target, without
requiring both sides to pretend to be targeting a specific board
that likely has little to do with the host in KVM scenarios.  This
avoids the need to add new boards to QEMU just to be able to
run KVM on new CPUs.

As this is the first platform that can run with either e500v2 or
e500mc, CONFIG_PPC_E500MC is now a legitimately user configurable
option, so add a help text.

Signed-off-by: Scott Wood <redacted>
---
 arch/powerpc/platforms/85xx/Kconfig     |   16 +++++++
 arch/powerpc/platforms/85xx/Makefile    |    1 +
 arch/powerpc/platforms/85xx/qemu_e500.c |   66 +++++++++++++++++++++++++++++++
 arch/powerpc/platforms/Kconfig.cputype  |    4 ++
 4 files changed, 87 insertions(+), 0 deletions(-)
 create mode 100644 arch/powerpc/platforms/85xx/qemu_e500.c

diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index f000d81..7bbebe5 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig

@@ -263,6 +263,22 @@ config P5020_DS
 	help
 	  This option enables support for the P5020 DS board
 
+config PPC_QEMU_E500
+	bool "QEMU generic e500 platform"
+	depends on EXPERIMENTAL
+	select DEFAULT_UIMAGE
+	help
+	  This option enables support for running as a QEMU guest using
+	  QEMU's generic e500 machine.  This is not required if you're
+	  using a QEMU machine that targets a specific board, such as
+	  mpc8544ds.
+
+	  Unlike most e500 boards that target a specific CPU, this
+	  platform works with any e500-family CPU that QEMU supports.
+	  Thus, you'll need to make sure CONFIG_PPC_E500MC is set or
+	  unset based on the emulated CPU (or actual host CPU in the case
+	  of KVM).
+
 endif # FSL_SOC_BOOKE
 
 config TQM85xx

diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 2125d4c..f841ac8 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile

@@ -28,3 +28,4 @@ obj-$(CONFIG_SOCRATES)    += socrates.o socrates_fpga_pic.o
 obj-$(CONFIG_KSI8560)	  += ksi8560.o
 obj-$(CONFIG_XES_MPC85xx) += xes_mpc85xx.o
 obj-$(CONFIG_GE_IMP3A)	  += ge_imp3a.o
+obj-$(CONFIG_PPC_QEMU_E500) += qemu_e500.o

diff --git a/arch/powerpc/platforms/85xx/qemu_e500.c b/arch/powerpc/platforms/85xx/qemu_e500.c
new file mode 100644
index 0000000..77c8d5d
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/qemu_e500.c

@@ -0,0 +1,66 @@
+/*
+ * Paravirt target for a generic QEMU e500 machine
+ *
+ * Copyright 2012 Freescale Semiconductor Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_fdt.h>
+#include <asm/machdep.h>
+#include <asm/time.h>
+#include <asm/udbg.h>
+#include <asm/mpic.h>
+#include <sysdev/fsl_soc.h>
+#include <sysdev/fsl_pci.h>
+#include "smp.h"
+#include "mpc85xx.h"
+
+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU,
+			0, 256, " OpenPIC  ");
+
+	BUG_ON(mpic == NULL);
+	mpic_init(mpic);
+}
+
+static void __init qemu_e500_setup_arch(void)
+{
+	ppc_md.progress("qemu_e500_setup_arch()", 0);
+
+	fsl_pci_init();
+	mpc85xx_smp_init();
+}
+
+/*
+ * Called very early, device-tree isn't unflattened
+ */
+static int __init qemu_e500_probe(void)
+{
+	unsigned long root = of_get_flat_dt_root();
+
+	return !!of_flat_dt_is_compatible(root, "fsl,qemu-e500");
+}
+
+machine_device_initcall(qemu_e500, mpc85xx_common_publish_devices);
+
+define_machine(qemu_e500) {
+	.name			= "QEMU e500",
+	.probe			= qemu_e500_probe,
+	.setup_arch		= qemu_e500_setup_arch,
+	.init_IRQ		= qemu_e500_pic_init,
+#ifdef CONFIG_PCI
+	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
+#endif
+	.get_irq		= mpic_get_irq,
+	.restart		= fsl_rstcr_restart,
+	.calibrate_decr		= generic_calibrate_decr,
+	.progress		= udbg_progress,
+};

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 61c9550..30fd01d 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype

@@ -159,6 +159,10 @@ config PPC_E500MC
 	bool "e500mc Support"
 	select PPC_FPU
 	depends on E500
+	help
+	  This must be enabled for running on e500mc (and derivatives
+	  such as e5500/e6500), and must be disabled for running on
+	  e500v1 or e500v2.
 
 config PPC_FPU
 	bool

-- 
1.7.5.4

[PATCH 3/3] powerpc/mpc85xx_ds: convert to unified PCI init

From: Scott Wood <hidden>
Date: 2012-06-27 23:50:17

Similar to how the primary PCI bridge is identified by looking
for an isa subnode, we determine whether to apply uli exclusions
by looking for a uli subnode.

Signed-off-by: Scott Wood <redacted>
---
Besides being an example of a real-hardware board to use the new PCI init
(probably one of the more complicated examples due to the uli device
exclusion), this fixes PCI under QEMU's mpc8544ds machine.  QEMU was
only creating one PCI bus, and it wasn't the one Linux had arbitrarily
deemed primary for mpc8544ds (AFAIK, there's no legacy ISA on this
board).

Tested with QEMU mpc8544ds, and real-hardware mpc8572ds (with uli).

 arch/powerpc/platforms/85xx/mpc85xx_ds.c |   97 +++++++++---------------------
 1 files changed, 29 insertions(+), 68 deletions(-)

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ds.c b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
index 1fd91e9..6d3265f 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ds.c

@@ -114,71 +114,53 @@ void __init mpc85xx_ds_pic_init(void)
 }
 
 #ifdef CONFIG_PCI
-static int primary_phb_addr;
 extern int uli_exclude_device(struct pci_controller *hose,
 				u_char bus, u_char devfn);
 
+static struct device_node *pci_with_uli;
+
 static int mpc85xx_exclude_device(struct pci_controller *hose,
 				   u_char bus, u_char devfn)
 {
-	struct device_node* node;
-	struct resource rsrc;
-
-	node = hose->dn;
-	of_address_to_resource(node, 0, &rsrc);
-
-	if ((rsrc.start & 0xfffff) == primary_phb_addr) {
+	if (hose->dn == pci_with_uli)
 		return uli_exclude_device(hose, bus, devfn);
-	}
 
 	return PCIBIOS_SUCCESSFUL;
 }
 #endif	/* CONFIG_PCI */
 
-/*
- * Setup the architecture
- */
-static void __init mpc85xx_ds_setup_arch(void)
+static void __init mpc85xx_ds_pci_init(void)
 {
 #ifdef CONFIG_PCI
-	struct device_node *np;
-	struct pci_controller *hose;
-#endif
-	dma_addr_t max = 0xffffffff;
+	struct device_node *node;
 
-	if (ppc_md.progress)
-		ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
+	fsl_pci_init();
 
-#ifdef CONFIG_PCI
-	for_each_node_by_type(np, "pci") {
-		if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
-		    of_device_is_compatible(np, "fsl,mpc8548-pcie") ||
-		    of_device_is_compatible(np, "fsl,p2020-pcie")) {
-			struct resource rsrc;
-			of_address_to_resource(np, 0, &rsrc);
-			if ((rsrc.start & 0xfffff) == primary_phb_addr)
-				fsl_add_bridge(np, 1);
-			else
-				fsl_add_bridge(np, 0);
-
-			hose = pci_find_hose_for_OF_device(np);
-			max = min(max, hose->dma_window_base_cur +
-					hose->dma_window_size);
+	/* See if we have a ULI under the primary */
+
+	node = of_find_node_by_name(NULL, "uli1575");
+	while ((pci_with_uli = of_get_parent(node))) {
+		of_node_put(node);
+		node = pci_with_uli;
+
+		if (pci_with_uli == fsl_pci_primary) {
+			ppc_md.pci_exclude_device = mpc85xx_exclude_device;
+			break;
 		}
 	}
-
-	ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 #endif
+}
 
-	mpc85xx_smp_init();
+/*
+ * Setup the architecture
+ */
+static void __init mpc85xx_ds_setup_arch(void)
+{
+	if (ppc_md.progress)
+		ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
 
-#ifdef CONFIG_SWIOTLB
-	if (memblock_end_of_DRAM() > max) {
-		ppc_swiotlb_enable = 1;
-		set_pci_dma_ops(&swiotlb_dma_ops);
-		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
-	}
-#endif
+	mpc85xx_ds_pci_init();
+	mpc85xx_smp_init();
 
 	printk("MPC85xx DS board from Freescale Semiconductor\n");
 }

@@ -190,14 +172,7 @@ static int __init mpc8544_ds_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
 
-	if (of_flat_dt_is_compatible(root, "MPC8544DS")) {
-#ifdef CONFIG_PCI
-		primary_phb_addr = 0xb000;
-#endif
-		return 1;
-	}
-
-	return 0;
+	return !!of_flat_dt_is_compatible(root, "MPC8544DS");
 }
 
 machine_device_initcall(mpc8544_ds, mpc85xx_common_publish_devices);

@@ -215,14 +190,7 @@ static int __init mpc8572_ds_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
 
-	if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS")) {
-#ifdef CONFIG_PCI
-		primary_phb_addr = 0x8000;
-#endif
-		return 1;
-	}
-
-	return 0;
+	return !!of_flat_dt_is_compatible(root, "fsl,MPC8572DS");
 }
 
 /*

@@ -232,14 +200,7 @@ static int __init p2020_ds_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
 
-	if (of_flat_dt_is_compatible(root, "fsl,P2020DS")) {
-#ifdef CONFIG_PCI
-		primary_phb_addr = 0x9000;
-#endif
-		return 1;
-	}
-
-	return 0;
+	return !!of_flat_dt_is_compatible(root, "fsl,P2020DS");
 }
 
 define_machine(mpc8544_ds) {

-- 
1.7.5.4

RE: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Jia Hongtao-B38951 <hidden>
Date: 2012-06-28 04:07:00

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia Hongtao-B38951
Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform
=20
The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also because
the generic qemu e500 platform wants a full list of FSL PCI compatibles
to check.
=20

It seems that not all primary bus has "isa" node like 8541 and 8555.

Without PM support for pci controllers I totally agree with this refactorin=
g
for pci init. But in linux mechanism PM ops should be registered to a drive=
r.
Do you have any ideas to add PM support for pci controllers under this patc=
hset?

Thanks.
-Jia Hongtao.

Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Scott Wood <hidden>
Date: 2012-06-28 16:32:00

On 06/27/2012 11:06 PM, Jia Hongtao-B38951 wrote:

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia Hongtao-B38951
Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform

The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also because
the generic qemu e500 platform wants a full list of FSL PCI compatibles
to check.

It seems that not all primary bus has "isa" node like 8541 and 8555.

Do those boards (it's the boards that matter, not chips...) have legacy
ISA?  If they do, and it's not in the device tree, then we should fix
the device tree for consistency, but also retain some sort of hack to
remain compatible with old device trees.

A board can refrain from using the new common infrastructure if it has a
good reason to.

Without PM support for pci controllers I totally agree with this refactoring
for pci init. But in linux mechanism PM ops should be registered to a driver.
Do you have any ideas to add PM support for pci controllers under this patchset?

This isn't meant to be instead of making it a platform device.  It's
just meant to get us away from board-specific code and primary-bus
hardcoding now, rather than once we sort out all the issues with
platform devices.

-Scott

RE: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Jia Hongtao-B38951 <hidden>
Date: 2012-06-29 02:36:13

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Z3Rhby4NCg==

Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Kumar Gala <hidden>
Date: 2012-06-29 15:57:44

On Jun 28, 2012, at 9:36 PM, Jia Hongtao-B38951 wrote:

=20
=20

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Friday, June 29, 2012 12:31 AM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; galak@kernel.crashing.org; Li Yang-R58472;
agraf@suse.de; linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU =

paravirt

quoted

platform
=20
On 06/27/2012 11:06 PM, Jia Hongtao-B38951 wrote:

quoted

=20
=20

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia =

Hongtao-B38951

quoted

Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform
=20
The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also

because

quoted

the generic qemu e500 platform wants a full list of FSL PCI

compatibles

quoted

to check.
=20

=20
It seems that not all primary bus has "isa" node like 8541 and 8555.

=20
Do those boards (it's the boards that matter, not chips...) have =

legacy

quoted

ISA?  If they do, and it's not in the device tree, then we should fix
the device tree for consistency, but also retain some sort of hack to
remain compatible with old device trees.
=20
A board can refrain from using the new common infrastructure if it =

has a

quoted

good reason to.

=20
I'm not sure that MPC8541CDS (or 8555) has legacy ISA. I just checked =

in

kernel and dts which implies the board has primary bus and no "isa" =

node.

I will find out the facts later.

Pretty sure the boards have ISA, if you see the .dts has references to =
'ISA bridge' & 'i8259' PIC.

- k

Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Scott Wood <hidden>
Date: 2012-06-29 16:02:00

On 06/29/2012 10:57 AM, Kumar Gala wrote:

On Jun 28, 2012, at 9:36 PM, Jia Hongtao-B38951 wrote:

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Friday, June 29, 2012 12:31 AM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; galak@kernel.crashing.org; Li Yang-R58472;
agraf@suse.de; linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform

On 06/27/2012 11:06 PM, Jia Hongtao-B38951 wrote:

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia Hongtao-B38951
Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform

The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also

because

quoted

the generic qemu e500 platform wants a full list of FSL PCI

compatibles

quoted

to check.

It seems that not all primary bus has "isa" node like 8541 and 8555.

Do those boards (it's the boards that matter, not chips...) have legacy
ISA?  If they do, and it's not in the device tree, then we should fix
the device tree for consistency, but also retain some sort of hack to
remain compatible with old device trees.

A board can refrain from using the new common infrastructure if it has a
good reason to.

I'm not sure that MPC8541CDS (or 8555) has legacy ISA. I just checked in
kernel and dts which implies the board has primary bus and no "isa" node.
I will find out the facts later.

Pretty sure the boards have ISA, if you see the .dts has references to 'ISA bridge' & 'i8259' PIC.

OK.  How about looking for an i8259 node as well?

-Scott

Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Kumar Gala <hidden>
Date: 2012-06-29 16:04:27

On Jun 29, 2012, at 11:01 AM, Scott Wood wrote:

On 06/29/2012 10:57 AM, Kumar Gala wrote:

quoted

=20
On Jun 28, 2012, at 9:36 PM, Jia Hongtao-B38951 wrote:
=20

quoted

=20
=20

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Friday, June 29, 2012 12:31 AM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; galak@kernel.crashing.org; Li Yang-R58472;
agraf@suse.de; linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU =

paravirt

quoted

platform
=20
On 06/27/2012 11:06 PM, Jia Hongtao-B38951 wrote:

quoted

=20
=20

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia =

Hongtao-B38951

quoted
quoted
quoted
quoted
quoted
Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU =

paravirt

quoted

platform
=20
The QEMU stuff is related to the PCI refactoring because =

currently

quoted

we have a hard time selecting a primary bus under QEMU, and also

because

quoted

the generic qemu e500 platform wants a full list of FSL PCI

compatibles

quoted

to check.
=20

=20
It seems that not all primary bus has "isa" node like 8541 and =

8555.

quoted

=20
Do those boards (it's the boards that matter, not chips...) have =

legacy

quoted

ISA?  If they do, and it's not in the device tree, then we should =

fix

quoted

the device tree for consistency, but also retain some sort of hack =

to

quoted

remain compatible with old device trees.
=20
A board can refrain from using the new common infrastructure if it =

has a

quoted

good reason to.

=20
I'm not sure that MPC8541CDS (or 8555) has legacy ISA. I just =

checked in

quoted

kernel and dts which implies the board has primary bus and no "isa" =

node.

quoted

I will find out the facts later.

=20
Pretty sure the boards have ISA, if you see the .dts has references =

to 'ISA bridge' & 'i8259' PIC.

=20
OK.  How about looking for an i8259 node as well?
=20
-Scott

Works for me, saves us having to waste time on figuring out how to =
update .dts for the boards.

- k

RE: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Zang Roy-R61911 <hidden>
Date: 2012-06-29 16:07:05

-----Original Message-----
From: Linuxppc-dev [mailto:linuxppc-dev-bounces+tie-
fei.zang=3Dfreescale.com@lists.ozlabs.org] On Behalf Of Kumar Gala
Sent: Friday, June 29, 2012 23:58 PM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; linuxppc-dev@lists.ozlabs.org; Li Yang-R58472;
agraf@suse.de
Subject: Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform
=20
=20
On Jun 28, 2012, at 9:36 PM, Jia Hongtao-B38951 wrote:
=20

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Friday, June 29, 2012 12:31 AM
To: Jia Hongtao-B38951
Cc: Wood Scott-B07421; galak@kernel.crashing.org; Li Yang-R58472;
agraf@suse.de; linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravir=

quoted

platform

On 06/27/2012 11:06 PM, Jia Hongtao-B38951 wrote:

quoted

-----Original Message-----
From: Wood Scott-B07421
Sent: Thursday, June 28, 2012 7:49 AM
To: galak@kernel.crashing.org
Cc: agraf@suse.de; linuxppc-dev@lists.ozlabs.org; Jia Hongtao-B38951
Subject: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt
platform

The QEMU stuff is related to the PCI refactoring because currently
we have a hard time selecting a primary bus under QEMU, and also

because

quoted

the generic qemu e500 platform wants a full list of FSL PCI

compatibles

quoted

to check.

It seems that not all primary bus has "isa" node like 8541 and 8555.

Do those boards (it's the boards that matter, not chips...) have legac=

quoted

ISA?  If they do, and it's not in the device tree, then we should fix
the device tree for consistency, but also retain some sort of hack to
remain compatible with old device trees.

A board can refrain from using the new common infrastructure if it has=

quoted

good reason to.

I'm not sure that MPC8541CDS (or 8555) has legacy ISA. I just checked i=

quoted

kernel and dts which implies the board has primary bus and no "isa" nod=

e.

quoted

I will find out the facts later.

=20
Pretty sure the boards have ISA, if you see the .dts has references to 'I=

SA

bridge' & 'i8259' PIC.

It is on the VIA south bridge.
Roy

RE: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Li Yang-R58472 <hidden>
Date: 2012-06-29 16:18:42

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IHJ1bi4NCg0KLSBMZW8NCg==

Re: [PATCH 0/3] powerpc/fsl: PCI refactoring and QEMU paravirt platform

From: Scott Wood <hidden>
Date: 2012-06-29 17:00:15

On 06/29/2012 11:18 AM, Li Yang-R58472 wrote:

quoted

-----Original Message----- From: Wood Scott-B07421 Sent: Friday,
June 29, 2012 11:02 AM To: Kumar Gala Cc: Jia Hongtao-B38951; Wood
Scott-B07421; Li Yang-R58472; agraf@suse.de; 
linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 0/3] powerpc/fsl:
PCI refactoring and QEMU paravirt platform

On 06/29/2012 10:57 AM, Kumar Gala wrote:

quoted

Pretty sure the boards have ISA, if you see the .dts has
references to

'ISA bridge' & 'i8259' PIC.

OK.  How about looking for an i8259 node as well?

That could work, but looks hackish.  Our proposal for adding a new
device tree property is a generic solution.

Yes, all *new* boards should have an isa node.  But we want to remain
compatible with existing device trees.

The only problem is that
new kernels would work with old device trees.  I think we can use
your solution for transitional period.  And go for a well defined
device tree binding for this in long run.

The "transitional period" is until we no longer care about these
specific boards, or any out-of-tree derivatives.

-Scott

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Alexander Graf <hidden>
Date: 2012-07-06 12:29:24

On 28.06.2012, at 01:50, Scott Wood wrote:

This gives the kernel a paravirtualized machine to target, without
requiring both sides to pretend to be targeting a specific board
that likely has little to do with the host in KVM scenarios.  This
avoids the need to add new boards to QEMU just to be able to
run KVM on new CPUs.
=20
As this is the first platform that can run with either e500v2 or
e500mc, CONFIG_PPC_E500MC is now a legitimately user configurable
option, so add a help text.
=20
Signed-off-by: Scott Wood <redacted>
---
arch/powerpc/platforms/85xx/Kconfig     |   16 +++++++
arch/powerpc/platforms/85xx/Makefile    |    1 +
arch/powerpc/platforms/85xx/qemu_e500.c |   66 =

+++++++++++++++++++++++++++++++

arch/powerpc/platforms/Kconfig.cputype  |    4 ++

I really think we should document what exactly this machine expects.

quoted hunk

4 files changed, 87 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/platforms/85xx/qemu_e500.c
=20

diff --git a/arch/powerpc/platforms/85xx/Kconfig =

b/arch/powerpc/platforms/85xx/Kconfig

quoted hunk

index f000d81..7bbebe5 100644

--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig

@@ -263,6 +263,22 @@ config P5020_DS

	help
	  This option enables support for the P5020 DS board
=20
+config PPC_QEMU_E500
+	bool "QEMU generic e500 platform"
+	depends on EXPERIMENTAL
+	select DEFAULT_UIMAGE
+	help
+	  This option enables support for running as a QEMU guest using
+	  QEMU's generic e500 machine.  This is not required if you're
+	  using a QEMU machine that targets a specific board, such as
+	  mpc8544ds.
+
+	  Unlike most e500 boards that target a specific CPU, this
+	  platform works with any e500-family CPU that QEMU supports.
+	  Thus, you'll need to make sure CONFIG_PPC_E500MC is set or
+	  unset based on the emulated CPU (or actual host CPU in the =

case

quoted hunk

+	  of KVM).
+
endif # FSL_SOC_BOOKE
=20
config TQM85xx

diff --git a/arch/powerpc/platforms/85xx/Makefile =

b/arch/powerpc/platforms/85xx/Makefile

quoted hunk

index 2125d4c..f841ac8 100644

--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile

@@ -28,3 +28,4 @@ obj-$(CONFIG_SOCRATES)    +=3D socrates.o =

socrates_fpga_pic.o

quoted hunk

obj-$(CONFIG_KSI8560)	  +=3D ksi8560.o
obj-$(CONFIG_XES_MPC85xx) +=3D xes_mpc85xx.o
obj-$(CONFIG_GE_IMP3A)	  +=3D ge_imp3a.o
+obj-$(CONFIG_PPC_QEMU_E500) +=3D qemu_e500.o

diff --git a/arch/powerpc/platforms/85xx/qemu_e500.c =

b/arch/powerpc/platforms/85xx/qemu_e500.c

quoted hunk

new file mode 100644
index 0000000..77c8d5d

--- /dev/null
+++ b/arch/powerpc/platforms/85xx/qemu_e500.c

@@ -0,0 +1,66 @@
+/*
+ * Paravirt target for a generic QEMU e500 machine
+ *
+ * Copyright 2012 Freescale Semiconductor Inc.
+ *
+ * This program is free software; you can redistribute  it and/or =

modify it

+ * under  the terms of  the GNU General  Public License as published =

by the

+ * Free Software Foundation;  either version 2 of the  License, or =

(at your

+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_fdt.h>
+#include <asm/machdep.h>
+#include <asm/time.h>
+#include <asm/udbg.h>
+#include <asm/mpic.h>
+#include <sysdev/fsl_soc.h>
+#include <sysdev/fsl_pci.h>
+#include "smp.h"
+#include "mpc85xx.h"
+
+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic =3D mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | =

MPIC_SINGLE_DEST_CPU,

+			0, 256, " OpenPIC  ");

Does that mean we're configuring the MPIC regardless of what the guest =
tells us? So the MPIC is a hard requirement. We can't use UIC or XPIC =
with this machine, right? This needs to be documented.

+
+	BUG_ON(mpic =3D=3D NULL);
+	mpic_init(mpic);
+}
+
+static void __init qemu_e500_setup_arch(void)
+{
+	ppc_md.progress("qemu_e500_setup_arch()", 0);
+
+	fsl_pci_init();
+	mpc85xx_smp_init();
+}
+
+/*
+ * Called very early, device-tree isn't unflattened
+ */
+static int __init qemu_e500_probe(void)
+{
+	unsigned long root =3D of_get_flat_dt_root();
+
+	return !!of_flat_dt_is_compatible(root, "fsl,qemu-e500");

So the machine needs to be compatible "fsl,qemu-e500". Needs =
documentation in the machine spec.

I'm sure you'll find more constraints that appear logical, but really =
should be written down so we have something formal that potentially =
someone not-QEMU or not-Scott could write a machine implementation =
against ;).


Alex

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Scott Wood <hidden>
Date: 2012-07-06 16:25:18

On 07/06/2012 07:29 AM, Alexander Graf wrote:

On 28.06.2012, at 01:50, Scott Wood wrote:

quoted

This gives the kernel a paravirtualized machine to target, without
requiring both sides to pretend to be targeting a specific board
that likely has little to do with the host in KVM scenarios.  This
avoids the need to add new boards to QEMU just to be able to
run KVM on new CPUs.

As this is the first platform that can run with either e500v2 or
e500mc, CONFIG_PPC_E500MC is now a legitimately user configurable
option, so add a help text.

Signed-off-by: Scott Wood <redacted>
---
arch/powerpc/platforms/85xx/Kconfig     |   16 +++++++
arch/powerpc/platforms/85xx/Makefile    |    1 +
arch/powerpc/platforms/85xx/qemu_e500.c |   66 +++++++++++++++++++++++++++++++
arch/powerpc/platforms/Kconfig.cputype  |    4 ++

I really think we should document what exactly this machine expects.

Well, the point of this paravirt machine is to avoid such assumptions --
it's all device-tree driven, at least in theory.  If a certain qemu
configuration ends up breaking the Linux platform (such as using a
different PIC), then that's a lack of flexibility on Linux's part that
should get fixed if someone finds it useful enough to justify the
effort.  Same with real hardware -- if you care about it, you add
support -- we just don't have a unique name for every configuration.
The information is there in the device tree, though.

Honestly, even having "qemu" in there is more specific than I'd prefer,
but I don't want to stir up the "generic platform" argument again
without at least limiting the scope.

quoted

+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU,
+			0, 256, " OpenPIC  ");

Does that mean we're configuring the MPIC regardless of what the
guest tells us? So the MPIC is a hard requirement. We can't use UIC
or XPIC with this machine, right? This needs to be documented.

Then what would we do if we want to add an ePAPR virtual PIC instead?
Or if something replaces MPIC on future FSL chips?

Better to change the Linux implementation as needed than to change a spec.

-Scott

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Alexander Graf <hidden>
Date: 2012-07-06 16:30:27

On 06.07.2012, at 18:25, Scott Wood wrote:

On 07/06/2012 07:29 AM, Alexander Graf wrote:

quoted

=20
On 28.06.2012, at 01:50, Scott Wood wrote:
=20

quoted

This gives the kernel a paravirtualized machine to target, without
requiring both sides to pretend to be targeting a specific board
that likely has little to do with the host in KVM scenarios.  This
avoids the need to add new boards to QEMU just to be able to
run KVM on new CPUs.
=20
As this is the first platform that can run with either e500v2 or
e500mc, CONFIG_PPC_E500MC is now a legitimately user configurable
option, so add a help text.
=20
Signed-off-by: Scott Wood <redacted>
---
arch/powerpc/platforms/85xx/Kconfig     |   16 +++++++
arch/powerpc/platforms/85xx/Makefile    |    1 +
arch/powerpc/platforms/85xx/qemu_e500.c |   66 =

+++++++++++++++++++++++++++++++

quoted

arch/powerpc/platforms/Kconfig.cputype  |    4 ++

=20
I really think we should document what exactly this machine expects.

=20
Well, the point of this paravirt machine is to avoid such assumptions =

--

it's all device-tree driven, at least in theory.  If a certain qemu
configuration ends up breaking the Linux platform (such as using a
different PIC), then that's a lack of flexibility on Linux's part that
should get fixed if someone finds it useful enough to justify the
effort.  Same with real hardware -- if you care about it, you add
support -- we just don't have a unique name for every configuration.
The information is there in the device tree, though.
=20
Honestly, even having "qemu" in there is more specific than I'd =

prefer,

but I don't want to stir up the "generic platform" argument again
without at least limiting the scope.

Well, can't we note down the assumptions we make to make sure that =
whoever develops an implementation of it knows what to implement? It's =
ppc specific for example. I also don't think that plugging a G3 in there =
works, would it?

=20

quoted

+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic =3D mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | =

MPIC_SINGLE_DEST_CPU,

quoted

+			0, 256, " OpenPIC  ");

=20
Does that mean we're configuring the MPIC regardless of what the
guest tells us? So the MPIC is a hard requirement. We can't use UIC
or XPIC with this machine, right? This needs to be documented.

=20
Then what would we do if we want to add an ePAPR virtual PIC instead?
Or if something replaces MPIC on future FSL chips?

Then we need a different compatible anyways, because we wouldn't be =
backwards compatible, no?

Better to change the Linux implementation as needed than to change a =

spec.

Why not keep the 2 in sync in the same patch? Just throw a file with a =
rough outline of the machine in Documentation/.


Alex

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Scott Wood <hidden>
Date: 2012-07-06 16:52:47

On 07/06/2012 11:30 AM, Alexander Graf wrote:

On 06.07.2012, at 18:25, Scott Wood wrote:

quoted

On 07/06/2012 07:29 AM, Alexander Graf wrote:

quoted

I really think we should document what exactly this machine expects.

Well, the point of this paravirt machine is to avoid such assumptions --
it's all device-tree driven, at least in theory.  If a certain qemu
configuration ends up breaking the Linux platform (such as using a
different PIC), then that's a lack of flexibility on Linux's part that
should get fixed if someone finds it useful enough to justify the
effort.  Same with real hardware -- if you care about it, you add
support -- we just don't have a unique name for every configuration.
The information is there in the device tree, though.

Honestly, even having "qemu" in there is more specific than I'd prefer,
but I don't want to stir up the "generic platform" argument again
without at least limiting the scope.

Well, can't we note down the assumptions we make to make sure that
whoever develops an implementation of it knows what to implement?
It's ppc specific for example. I also don't think that plugging a G3
in there works, would it?

Well, it does have "e500" in the name. :-P

quoted

+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU,
+			0, 256, " OpenPIC  ");

Does that mean we're configuring the MPIC regardless of what the
guest tells us? So the MPIC is a hard requirement. We can't use UIC
or XPIC with this machine, right? This needs to be documented.

Then what would we do if we want to add an ePAPR virtual PIC instead?
Or if something replaces MPIC on future FSL chips?

Then we need a different compatible anyways, because we wouldn't be backwards compatible, no?

No, that's exactly what I'm trying to avoid.  This notion of a toplevel
compatible that tells you everything you need to know about the machine
(even if Linux chooses to be device-tree-based for some arbitrary subset
of that information) is incompatible with a flexible virtual platform.

All this compatible is saying is "see the rest of the device tree".
How well Linux does so is a quality of implementation issue that can be
addressed as needed.  The information about what sort of interrupt
controller you have is already in the device tree.  The device tree is
the machine spec.

Another assumption this patch makes is that it doesn't need SWIOTLB.  Is
"has more than 4GiB RAM" a machine attribute that would warrant a
separate toplevel compatible?  SWIOTLB for PCI is handled due to the
previous patch that provides common PCI code -- but in a previous
version of the patch it was not handled.  Is it yet another incompatible
machine spec if RAM must be less than 4GiB minus PCICSRBAR (ignoring the
QEMU bug that PCICSRBAR is not implemented)?

quoted

Better to change the Linux implementation as needed than to change a spec.

Why not keep the 2 in sync in the same patch? Just throw a file with a rough outline of the machine in Documentation/.

Because that would give people the wrong impression about what this
machine is, and be unlikely to stay in sync or be a complete listing of
current assumptions.  You're basically suggesting to use Documentation/
as a bug tracker.

-Scott

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Alexander Graf <hidden>
Date: 2012-07-06 16:59:32

On 06.07.2012, at 18:52, Scott Wood wrote:

On 07/06/2012 11:30 AM, Alexander Graf wrote:

quoted

=20
On 06.07.2012, at 18:25, Scott Wood wrote:
=20

quoted

On 07/06/2012 07:29 AM, Alexander Graf wrote:

quoted

I really think we should document what exactly this machine =

expects.

quoted

=20
Well, the point of this paravirt machine is to avoid such =

assumptions --

quoted

it's all device-tree driven, at least in theory.  If a certain qemu
configuration ends up breaking the Linux platform (such as using a
different PIC), then that's a lack of flexibility on Linux's part =

that

quoted

should get fixed if someone finds it useful enough to justify the
effort.  Same with real hardware -- if you care about it, you add
support -- we just don't have a unique name for every configuration.
The information is there in the device tree, though.
=20
Honestly, even having "qemu" in there is more specific than I'd =

prefer,

quoted

but I don't want to stir up the "generic platform" argument again
without at least limiting the scope.

=20
Well, can't we note down the assumptions we make to make sure that
whoever develops an implementation of it knows what to implement?
It's ppc specific for example. I also don't think that plugging a G3
in there works, would it?

=20
Well, it does have "e500" in the name. :-P
=20

quoted

+void __init qemu_e500_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic =3D mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | =

MPIC_SINGLE_DEST_CPU,

quoted

+			0, 256, " OpenPIC  ");

=20
Does that mean we're configuring the MPIC regardless of what the
guest tells us? So the MPIC is a hard requirement. We can't use UIC
or XPIC with this machine, right? This needs to be documented.

=20
Then what would we do if we want to add an ePAPR virtual PIC =

instead?

quoted

Or if something replaces MPIC on future FSL chips?

=20
Then we need a different compatible anyways, because we wouldn't be =

backwards compatible, no?

=20
No, that's exactly what I'm trying to avoid.  This notion of a =

toplevel

compatible that tells you everything you need to know about the =

machine

(even if Linux chooses to be device-tree-based for some arbitrary =

subset

of that information) is incompatible with a flexible virtual platform.
=20
All this compatible is saying is "see the rest of the device tree".
How well Linux does so is a quality of implementation issue that can =

be

addressed as needed.  The information about what sort of interrupt
controller you have is already in the device tree.  The device tree is
the machine spec.
=20
Another assumption this patch makes is that it doesn't need SWIOTLB.  =

Is

"has more than 4GiB RAM" a machine attribute that would warrant a
separate toplevel compatible?  SWIOTLB for PCI is handled due to the
previous patch that provides common PCI code -- but in a previous
version of the patch it was not handled.  Is it yet another =

incompatible

machine spec if RAM must be less than 4GiB minus PCICSRBAR (ignoring =

the

QEMU bug that PCICSRBAR is not implemented)?

Well, the thing that I'm wary of is the following. Imagine we make this =
the default machine type for all e500 user cases. Which is reasonable. =
Now we release 3.6 which works awesome with QEMU 1.2. We change =
something in QEMU. QEMU 1.3 comes out. It can no longer boot your old =
kernel 3.6.

That's the type of situation I don't want to be in. We need to be =
backwards compatible with what we used to be able to run. We can get =
away with declaring things as experimental for now, until we settled on =
a reasonable compromise to achieve said compatibility. But it needs to =
be our goal somewhere.

One idea would be to version the machine type according to what Linux =
implements. If Linux finds a machine type that is newer than what it =
implements, it spawns a warning. If we want, we can implement backwards =
compatible machine types in QEMU, similar to how we implement -M pc-0.12 =
and friends today.

Again, no need to do so as long as we tell users to not use it. As soon =
as we want them to actually run the machine, we need to have independent =
upgrade paths in place. New QEMU needs to be able to run old kernels. =
New kernels need to be run on old QEMU.

=20

quoted

Better to change the Linux implementation as needed than to change a =

spec.

quoted

=20
Why not keep the 2 in sync in the same patch? Just throw a file with =

a rough outline of the machine in Documentation/.

=20
Because that would give people the wrong impression about what this
machine is, and be unlikely to stay in sync or be a complete listing =

of

current assumptions.  You're basically suggesting to use =

Documentation/

as a bug tracker.

I'm just saying that every time we hardcode assumptions, we need to make =
sure we document it somewhere. And currently we do hardcode assumptions, =
even though only a few.


Alex

Re: [PATCH 2/3] powerpc/e500: add paravirt QEMU platform

From: Scott Wood <hidden>
Date: 2012-07-06 22:05:05

On 07/06/2012 11:59 AM, Alexander Graf wrote:

On 06.07.2012, at 18:52, Scott Wood wrote:

quoted

On 07/06/2012 11:30 AM, Alexander Graf wrote:

quoted

On 06.07.2012, at 18:25, Scott Wood wrote:

quoted

Then what would we do if we want to add an ePAPR virtual PIC
instead? Or if something replaces MPIC on future FSL chips?

Then we need a different compatible anyways, because we wouldn't
be backwards compatible, no?

No, that's exactly what I'm trying to avoid.  This notion of a
toplevel compatible that tells you everything you need to know
about the machine (even if Linux chooses to be device-tree-based
for some arbitrary subset of that information) is incompatible with
a flexible virtual platform.

All this compatible is saying is "see the rest of the device
tree". How well Linux does so is a quality of implementation issue
that can be addressed as needed.  The information about what sort
of interrupt controller you have is already in the device tree.
The device tree is the machine spec.

Another assumption this patch makes is that it doesn't need
SWIOTLB.  Is "has more than 4GiB RAM" a machine attribute that
would warrant a separate toplevel compatible?  SWIOTLB for PCI is
handled due to the previous patch that provides common PCI code --
but in a previous version of the patch it was not handled.  Is it
yet another incompatible machine spec if RAM must be less than 4GiB
minus PCICSRBAR (ignoring the QEMU bug that PCICSRBAR is not
implemented)?

Well, the thing that I'm wary of is the following. Imagine we make
this the default machine type for all e500 user cases. Which is
reasonable. Now we release 3.6 which works awesome with QEMU 1.2. We
change something in QEMU. QEMU 1.3 comes out. It can no longer boot
your old kernel 3.6.

Do you expect your old kernel to boot when you get new hardware?  QEMU
is basically hardware that is easy to change.

The only thing that using a more specific compatible would do is make
sure that the kernel wouldn't boot whenever it changes, rather than just
having a chance of certain combinations having problems.

Obviously we should make a reasonable effort to avoid gratuitous
breakage in the default config, but I just don't see how overspecifying
things is going to help.

That's the type of situation I don't want to be in. We need to be
backwards compatible with what we used to be able to run. We can get
away with declaring things as experimental for now, until we settled
on a reasonable compromise to achieve said compatibility. But it
needs to be our goal somewhere.

One idea would be to version the machine type according to what Linux
implements. If Linux finds a machine type that is newer than what it
implements, it spawns a warning.

What does it mean to have a version number for a platform which is
intended to eventually be arbitrarily configurable?

If we want, we can implement
backwards compatible machine types in QEMU, similar to how we
implement -M pc-0.12 and friends today.

Heh, I was just about to respond by saying "how would you version a PC"? :-)

If you want a stable versioned platform that happens to not pretend to
be a real board, go ahead and add one -- that's not what this is for.
Maybe instead of documenting things like "has an MPIC", there should be
some comment mentioning that this platform is intended to be flexible
and device tree driven, not static.  The device tree is the machine
spec.  I could see an argument for versioning individual devices, OTOH,
rather than e.g. pretending the PCI is really equivalent to an
mpc8540-pci despite significant missing functionality.

BTW, could you point me to the documentation that explains exactly what
a pc-0.12 is?  And is there any place in Linux that actually sees this
version number and does anything with it?  How would a user know what
version of a PC to request?  What version do you get by default?  Under
what conditions are the version number bumped?

Again, no need to do so as long as we tell users to not use it. As
soon as we want them to actually run the machine, we need to have
independent upgrade paths in place. New QEMU needs to be able to run
old kernels. New kernels need to be run on old QEMU.

They will, usually.  We can't guarantee this will always be true
regardless of a versioning scheme, since bugs will happen.

quoted

Better to change the Linux implementation as needed than to
change a spec.

Why not keep the 2 in sync in the same patch? Just throw a file
with a rough outline of the machine in Documentation/.

Because that would give people the wrong impression about what
this machine is, and be unlikely to stay in sync or be a complete
listing of current assumptions.  You're basically suggesting to use
Documentation/ as a bug tracker.

I'm just saying that every time we hardcode assumptions, we need to
make sure we document it somewhere. And currently we do hardcode
assumptions, even though only a few.

If you want a bug tracker, use a bug tracker.  Linux already has plenty
of assumptions regarding the real hardware it runs on, how firmware
configures it, etc.  Most of these assumptions are not documented, and
things get changed when new hardware comes along that breaks an
assumption.  Most of the assumptions this platform would be making come
from outside the platform file itself.  If I tried to document it, it
would be incomplete and quickly become out of date.

-Scott

Re: [PATCH 3/3] powerpc/mpc85xx_ds: convert to unified PCI init

From: Kumar Gala <hidden>
Date: 2012-07-10 18:31:19

On Jun 27, 2012, at 6:50 PM, Scott Wood wrote:

Similar to how the primary PCI bridge is identified by looking
for an isa subnode, we determine whether to apply uli exclusions
by looking for a uli subnode.
=20
Signed-off-by: Scott Wood <redacted>
---
Besides being an example of a real-hardware board to use the new PCI =

init

(probably one of the more complicated examples due to the uli device
exclusion), this fixes PCI under QEMU's mpc8544ds machine.  QEMU was
only creating one PCI bus, and it wasn't the one Linux had arbitrarily
deemed primary for mpc8544ds (AFAIK, there's no legacy ISA on this
board).
=20
Tested with QEMU mpc8544ds, and real-hardware mpc8572ds (with uli).
=20
arch/powerpc/platforms/85xx/mpc85xx_ds.c |   97 =

+++++++++---------------------

1 files changed, 29 insertions(+), 68 deletions(-)

Can you rebase against my 'next' branch.. having issues applying this.

- k=

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