consolidate direct dma mapping and swiotlb support

97 messages, 8 authors, 2018-01-09 · page 1 of 2 · open the first message on its own page

consolidate direct dma mapping and swiotlb support

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:19:28

Almost every architecture supports a direct dma mapping implementation,
where no iommu is used and the device dma address is a 1:1 mapping to
the physical address or has a simple linear offset.  Currently the
code for this implementation is most duplicated over the architectures,
and the duplicated again in the swiotlb code, and then duplicated again
for special cases like the x86 memory encryption DMA ops.

This series takes the existing very simple dma-noop dma mapping
implementation, enhances it with all the x86 features and quirks, and
creates a common set of architecture hooks for it and the swiotlb code.

It then switches a large number of architectures to this generic
direct map implement and the new generic swiotlb dma_map ops.

Note that for now this only handles architectures that do cache coherent
DMA, but a similar consolidation for non-coherent architectures is in the
work for later merge windows.

[PATCH 02/67] alpha: mark jensen as broken

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:19:40

CONFIG_ALPHA_JENSEN has failed to compile since commit aca05038
("alpha/dma: use common noop dma ops"), so mark it as broken.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b31b974a03cb..e96adcbcab41 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig

@@ -209,6 +209,7 @@ config ALPHA_EIGER
 
 config ALPHA_JENSEN
 	bool "Jensen"
+	depends on BROKEN
 	help
 	  DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
 	  of the first-generation Alpha systems. A number of these systems

-- 
2.14.2

[PATCH 03/67] dma-mapping: take dma_pfn_offset into account in dma_max_pfn

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:19:45

This makes sure the generic version can be used with architectures /
devices that have a DMA offset in the direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/dma-mapping.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 81ed9b2d84dc..d84951865be7 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -692,7 +692,7 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 #ifndef dma_max_pfn
 static inline unsigned long dma_max_pfn(struct device *dev)
 {
-	return *dev->dma_mask >> PAGE_SHIFT;
+	return (*dev->dma_mask >> PAGE_SHIFT) + dev->dma_pfn_offset;
 }
 #endif

-- 
2.14.2

[PATCH 04/67] arm64: don't override dma_max_pfn

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:19:56

The generic version now takes dma_pfn_offset into account, so there is no
more need for an architecture override.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm64/include/asm/dma-mapping.h | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index 0df756b24863..eada887a93bf 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h

@@ -76,14 +76,5 @@ static inline void dma_mark_clean(void *addr, size_t size)
 {
 }
 
-/* Override for dma_max_pfn() */
-static inline unsigned long dma_max_pfn(struct device *dev)
-{
-	dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
-
-	return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
-}
-#define dma_max_pfn(dev) dma_max_pfn(dev)
-
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_DMA_MAPPING_H */

-- 
2.14.2

[PATCH 06/67] hexagon: remove unused flush_write_buffers definition

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:00

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/hexagon/include/asm/io.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index 66f5e9a61efc..9e8621d94ee9 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h

@@ -330,8 +330,6 @@ static inline void outsl(unsigned long port, const void *buffer, int count)
 	}
 }
 
-#define flush_write_buffers() do { } while (0)
-
 #endif /* __KERNEL__ */
 
 #endif

-- 
2.14.2

[PATCH 07/67] m32r: remove unused flush_write_buffers definition

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:03

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/m32r/include/asm/io.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/m32r/include/asm/io.h b/arch/m32r/include/asm/io.h
index 1b653bb16f9a..a4272d8f0d9c 100644
--- a/arch/m32r/include/asm/io.h
+++ b/arch/m32r/include/asm/io.h

@@ -191,8 +191,6 @@ static inline void _writel(unsigned long l, unsigned long addr)
 
 #define mmiowb()
 
-#define flush_write_buffers() do { } while (0)  /* M32R_FIXME */
-
 static inline void
 memset_io(volatile void __iomem *addr, unsigned char val, int count)
 {

-- 
2.14.2

[PATCH 09/67] arc: remove CONFIG_ARC_PLAT_NEEDS_PHYS_TO_DMA

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:06

We always use the stub definitions, so remove the unused other code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arc/Kconfig                   |  3 ---
 arch/arc/include/asm/dma-mapping.h |  7 -------
 arch/arc/mm/dma.c                  | 14 +++++++-------
 3 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 9d5fd00d9e91..f3a80cf164cc 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig

@@ -463,9 +463,6 @@ config ARCH_PHYS_ADDR_T_64BIT
 config ARCH_DMA_ADDR_T_64BIT
 	bool
 
-config ARC_PLAT_NEEDS_PHYS_TO_DMA
-	bool
-
 config ARC_KVADDR_SIZE
 	int "Kernel Virtual Address Space size (MB)"
 	range 0 512

diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
index 94285031c4fb..7a16824bfe98 100644
--- a/arch/arc/include/asm/dma-mapping.h
+++ b/arch/arc/include/asm/dma-mapping.h

@@ -11,13 +11,6 @@
 #ifndef ASM_ARC_DMA_MAPPING_H
 #define ASM_ARC_DMA_MAPPING_H
 
-#ifndef CONFIG_ARC_PLAT_NEEDS_PHYS_TO_DMA
-#define plat_dma_to_phys(dev, dma_handle) ((phys_addr_t)(dma_handle))
-#define plat_phys_to_dma(dev, paddr) ((dma_addr_t)(paddr))
-#else
-#include <plat/dma.h>
-#endif
-
 extern const struct dma_map_ops arc_dma_ops;
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index fad18261ef6a..1d405b86250c 100644
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c

@@ -60,7 +60,7 @@ static void *arc_dma_alloc(struct device *dev, size_t size,
 	/* This is linear addr (0x8000_0000 based) */
 	paddr = page_to_phys(page);
 
-	*dma_handle = plat_phys_to_dma(dev, paddr);
+	*dma_handle = paddr;
 
 	/* This is kernel Virtual address (0x7000_0000 based) */
 	if (need_kvaddr) {

@@ -92,7 +92,7 @@ static void *arc_dma_alloc(struct device *dev, size_t size,
 static void arc_dma_free(struct device *dev, size_t size, void *vaddr,
 		dma_addr_t dma_handle, unsigned long attrs)
 {
-	phys_addr_t paddr = plat_dma_to_phys(dev, dma_handle);
+	phys_addr_t paddr = dma_handle;
 	struct page *page = virt_to_page(paddr);
 	int is_non_coh = 1;

@@ -111,7 +111,7 @@ static int arc_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 {
 	unsigned long user_count = vma_pages(vma);
 	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	unsigned long pfn = __phys_to_pfn(plat_dma_to_phys(dev, dma_addr));
+	unsigned long pfn = __phys_to_pfn(dma_addr);
 	unsigned long off = vma->vm_pgoff;
 	int ret = -ENXIO;

@@ -175,7 +175,7 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page,
 	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 		_dma_cache_sync(paddr, size, dir);
 
-	return plat_phys_to_dma(dev, paddr);
+	return paddr;
 }
 
 /*

@@ -190,7 +190,7 @@ static void arc_dma_unmap_page(struct device *dev, dma_addr_t handle,
 			       size_t size, enum dma_data_direction dir,
 			       unsigned long attrs)
 {
-	phys_addr_t paddr = plat_dma_to_phys(dev, handle);
+	phys_addr_t paddr = handle;
 
 	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 		_dma_cache_sync(paddr, size, dir);

@@ -224,13 +224,13 @@ static void arc_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 static void arc_dma_sync_single_for_cpu(struct device *dev,
 		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
 {
-	_dma_cache_sync(plat_dma_to_phys(dev, dma_handle), size, DMA_FROM_DEVICE);
+	_dma_cache_sync(dma_handle, size, DMA_FROM_DEVICE);
 }
 
 static void arc_dma_sync_single_for_device(struct device *dev,
 		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
 {
-	_dma_cache_sync(plat_dma_to_phys(dev, dma_handle), size, DMA_TO_DEVICE);
+	_dma_cache_sync(dma_handle, size, DMA_TO_DEVICE);
 }
 
 static void arc_dma_sync_sg_for_cpu(struct device *dev,

-- 
2.14.2

[PATCH 11/67] riscv: remove the unused dma_capable helper

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:15

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/include/asm/dma-mapping.h | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h
index 3eec1000196d..73849e2cc761 100644
--- a/arch/riscv/include/asm/dma-mapping.h
+++ b/arch/riscv/include/asm/dma-mapping.h

@@ -27,12 +27,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &dma_noop_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return false;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 #endif	/* __ASM_RISCV_DMA_MAPPING_H */

-- 
2.14.2

[PATCH 13/67] dma-mapping: move swiotlb arch helpers to a new header

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:25

phys_to_dma, dma_to_phys and dma_capable are helpers published by
architecture code for use of swiotlb and xen-swiotlb only.  Drivers are
not supposed to use these directly, but use the DMA API instead.

Move these to a new asm/dma-direct.h helper, included by a
linux/dma-direct.h wrapper that provides the default linear mapping
unless the architecture wants to override it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 MAINTAINERS                                        |  1 +
 arch/Kconfig                                       |  4 +++
 arch/arm/Kconfig                                   |  1 +
 arch/arm/include/asm/dma-direct.h                  | 36 ++++++++++++++++++++++
 arch/arm/include/asm/dma-mapping.h                 | 31 -------------------
 arch/arm64/include/asm/dma-mapping.h               | 22 -------------
 arch/arm64/mm/dma-mapping.c                        |  2 +-
 arch/ia64/include/asm/dma-mapping.h                | 18 -----------
 arch/mips/Kconfig                                  |  2 ++
 arch/mips/include/asm/dma-direct.h                 |  1 +
 arch/mips/include/asm/dma-mapping.h                |  8 -----
 .../include/asm/mach-cavium-octeon/dma-coherence.h |  8 +++++
 arch/mips/include/asm/mach-generic/dma-coherence.h | 12 --------
 .../include/asm/mach-loongson64/dma-coherence.h    |  8 +++++
 arch/powerpc/Kconfig                               |  1 +
 arch/powerpc/include/asm/dma-direct.h              | 29 +++++++++++++++++
 arch/powerpc/include/asm/dma-mapping.h             | 25 ---------------
 arch/tile/include/asm/dma-mapping.h                | 18 -----------
 arch/unicore32/include/asm/dma-mapping.h           | 18 -----------
 arch/x86/Kconfig                                   |  1 +
 arch/x86/include/asm/dma-direct.h                  | 30 ++++++++++++++++++
 arch/x86/include/asm/dma-mapping.h                 | 26 ----------------
 arch/x86/kernel/amd_gart_64.c                      |  1 +
 arch/x86/kernel/pci-dma.c                          |  2 +-
 arch/x86/kernel/pci-nommu.c                        |  2 +-
 arch/x86/kernel/pci-swiotlb.c                      |  2 +-
 arch/x86/mm/mem_encrypt.c                          |  2 +-
 arch/x86/pci/sta2x11-fixup.c                       |  1 +
 arch/xtensa/include/asm/dma-mapping.h              | 10 ------
 drivers/crypto/marvell/cesa.c                      |  1 +
 drivers/mtd/nand/qcom_nandc.c                      |  1 +
 drivers/xen/swiotlb-xen.c                          |  2 +-
 include/linux/dma-direct.h                         | 32 +++++++++++++++++++
 lib/swiotlb.c                                      |  2 +-
 34 files changed, 165 insertions(+), 195 deletions(-)
 create mode 100644 arch/arm/include/asm/dma-direct.h
 create mode 100644 arch/mips/include/asm/dma-direct.h
 create mode 100644 arch/powerpc/include/asm/dma-direct.h
 create mode 100644 arch/x86/include/asm/dma-direct.h
 create mode 100644 include/linux/dma-direct.h

diff --git a/MAINTAINERS b/MAINTAINERS
index a6e86e20761e..7521b063b499 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -4340,6 +4340,7 @@ F:	lib/dma-noop.c
 F:	lib/dma-virt.c
 F:	drivers/base/dma-mapping.c
 F:	drivers/base/dma-coherent.c
+F:	include/linux/dma-direct.h
 F:	include/linux/dma-mapping.h
 
 DME1737 HARDWARE MONITOR DRIVER

diff --git a/arch/Kconfig b/arch/Kconfig
index 400b9e1b2f27..3edf118ad777 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig

@@ -938,6 +938,10 @@ config STRICT_MODULE_RWX
 	  and non-text memory will be made non-executable. This provides
 	  protection against certain security exploits (e.g. writing to text)
 
+# select if the architecture provides an asm/dma-direct.h header
+config ARCH_HAS_PHYS_TO_DMA
+	bool
+
 config ARCH_HAS_REFCOUNT
 	bool
 	help

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 51c8df561077..00d889a37965 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -8,6 +8,7 @@ config ARM
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_SET_MEMORY
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
 	select ARCH_HAS_STRICT_MODULE_RWX if MMU
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
new file mode 100644
index 000000000000..5b0a8a421894
--- /dev/null
+++ b/arch/arm/include/asm/dma-direct.h

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_ARM_DMA_DIRECT_H
+#define ASM_ARM_DMA_DIRECT_H 1
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	unsigned int offset = paddr & ~PAGE_MASK;
+	return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+{
+	unsigned int offset = dev_addr & ~PAGE_MASK;
+	return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	u64 limit, mask;
+
+	if (!dev->dma_mask)
+		return 0;
+
+	mask = *dev->dma_mask;
+
+	limit = (mask + 1) & ~mask;
+	if (limit && size > limit)
+		return 0;
+
+	if ((addr | (addr + size - 1)) & ~mask)
+		return 0;
+
+	return 1;
+}
+
+#endif /* ASM_ARM_DMA_DIRECT_H */

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index daf837423a76..5fb1b7fbdfbe 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h

@@ -109,37 +109,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
 	return dev->archdata.dma_coherent;
 }
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	unsigned int offset = paddr & ~PAGE_MASK;
-	return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
-	unsigned int offset = dev_addr & ~PAGE_MASK;
-	return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
-}
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	u64 limit, mask;
-
-	if (!dev->dma_mask)
-		return 0;
-
-	mask = *dev->dma_mask;
-
-	limit = (mask + 1) & ~mask;
-	if (limit && size > limit)
-		return 0;
-
-	if ((addr | (addr + size - 1)) & ~mask)
-		return 0;
-
-	return 1;
-}
-
 static inline void dma_mark_clean(void *addr, size_t size) { }
 
 /**

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index eada887a93bf..400fa67d3b5a 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h

@@ -50,28 +50,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
 	return dev->archdata.dma_coherent;
 }
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	dma_addr_t dev_addr = (dma_addr_t)paddr;
-
-	return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
-	phys_addr_t paddr = (phys_addr_t)dev_addr;
-
-	return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
-}
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return false;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 static inline void dma_mark_clean(void *addr, size_t size)
 {
 }

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index b45c5bcaeccb..f3a637b98487 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c

@@ -24,7 +24,7 @@
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/genalloc.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/dma-contiguous.h>
 #include <linux/vmalloc.h>
 #include <linux/swiotlb.h>

diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index c1bab526a046..eabee56d995c 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h

@@ -27,22 +27,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return platform_dma_get_ops(NULL);
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return 0;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return daddr;
-}
-
 #endif /* _ASM_IA64_DMA_MAPPING_H */

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 350a990fc719..4b0c26b2e9b7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig

@@ -429,6 +429,7 @@ config MACH_LOONGSON32
 
 config MACH_LOONGSON64
 	bool "Loongson-2/3 family of machines"
+	select ARCH_HAS_PHYS_TO_DMA
 	select SYS_SUPPORTS_ZBOOT
 	help
 	  This enables the support of Loongson-2/3 family of machines.

@@ -877,6 +878,7 @@ config MIKROTIK_RB532
 config CAVIUM_OCTEON_SOC
 	bool "Cavium Networks Octeon SoC based boards"
 	select CEVT_R4K
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_PHYS_ADDR_T_64BIT
 	select DMA_COHERENT
 	select SYS_SUPPORTS_64BIT_KERNEL

diff --git a/arch/mips/include/asm/dma-direct.h b/arch/mips/include/asm/dma-direct.h
new file mode 100644
index 000000000000..f32f15530aba
--- /dev/null
+++ b/arch/mips/include/asm/dma-direct.h

@@ -0,0 +1 @@
+#include <asm/dma-coherence.h>

diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 0d9418d264f9..676c14cfc580 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h

@@ -17,14 +17,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return mips_dma_map_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return false;
-
-	return addr + size <= *dev->dma_mask;
-}
-
 static inline void dma_mark_clean(void *addr, size_t size) {}
 
 #define arch_setup_dma_ops arch_setup_dma_ops

diff --git a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
index 9110988b92a1..f00833acb626 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h

@@ -61,6 +61,14 @@ static inline void plat_post_dma_flush(struct device *dev)
 {
 }
 
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	if (!dev->dma_mask)
+		return false;
+
+	return addr + size <= *dev->dma_mask;
+}
+
 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
 phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);

diff --git a/arch/mips/include/asm/mach-generic/dma-coherence.h b/arch/mips/include/asm/mach-generic/dma-coherence.h
index 61addb1677e9..8ad7a40ca786 100644
--- a/arch/mips/include/asm/mach-generic/dma-coherence.h
+++ b/arch/mips/include/asm/mach-generic/dma-coherence.h

@@ -70,16 +70,4 @@ static inline void plat_post_dma_flush(struct device *dev)
 }
 #endif
 
-#ifdef CONFIG_SWIOTLB
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return daddr;
-}
-#endif
-
 #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */

diff --git a/arch/mips/include/asm/mach-loongson64/dma-coherence.h b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
index 1602a9e9e8c2..5cfda8f893e9 100644
--- a/arch/mips/include/asm/mach-loongson64/dma-coherence.h
+++ b/arch/mips/include/asm/mach-loongson64/dma-coherence.h

@@ -17,6 +17,14 @@
 
 struct device;
 
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	if (!dev->dma_mask)
+		return false;
+
+	return addr + size <= *dev->dma_mask;
+}
+
 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c51e6ce42e7a..887285eb684a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig

@@ -139,6 +139,7 @@ config PPC
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API                if PPC64
 	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE
 	select ARCH_HAS_SG_CHAIN

diff --git a/arch/powerpc/include/asm/dma-direct.h b/arch/powerpc/include/asm/dma-direct.h
new file mode 100644
index 000000000000..a5b59c765426
--- /dev/null
+++ b/arch/powerpc/include/asm/dma-direct.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_POWERPC_DMA_DIRECT_H
+#define ASM_POWERPC_DMA_DIRECT_H 1
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+#ifdef CONFIG_SWIOTLB
+	struct dev_archdata *sd = &dev->archdata;
+
+	if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
+		return false;
+#endif
+
+	if (!dev->dma_mask)
+		return false;
+
+	return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return paddr + get_dma_offset(dev);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return daddr - get_dma_offset(dev);
+}
+#endif /* ASM_POWERPC_DMA_DIRECT_H */

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 592c7f418aa0..f6ab51205a85 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h

@@ -112,31 +112,6 @@ extern int dma_set_mask(struct device *dev, u64 dma_mask);
 
 extern u64 __dma_get_required_mask(struct device *dev);
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-#ifdef CONFIG_SWIOTLB
-	struct dev_archdata *sd = &dev->archdata;
-
-	if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
-		return false;
-#endif
-
-	if (!dev->dma_mask)
-		return false;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr + get_dma_offset(dev);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return daddr - get_dma_offset(dev);
-}
-
 #define ARCH_HAS_DMA_MMAP_COHERENT
 
 #endif /* __KERNEL__ */

diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 97ad62878290..75b8aaa4e70b 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h

@@ -44,26 +44,8 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
 	dev->archdata.dma_offset = off;
 }
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return daddr;
-}
-
 static inline void dma_mark_clean(void *addr, size_t size) {}
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return 0;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 #define HAVE_ARCH_DMA_SET_MASK 1
 int dma_set_mask(struct device *dev, u64 mask);

diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index ac608c2f6af6..5cb250bf2d8c 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h

@@ -25,24 +25,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &swiotlb_dma_map_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (dev && dev->dma_mask)
-		return addr + size - 1 <= *dev->dma_mask;
-
-	return 1;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return daddr;
-}
-
 static inline void dma_mark_clean(void *addr, size_t size) {}
 
 #endif /* __KERNEL__ */

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d4fc98c50378..f6f4328103c0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig

@@ -54,6 +54,7 @@ config X86
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_KCOV			if X86_64
+	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API		if X86_64
 	# Causing hangs/crashes, see the commit that added this change for details.
 	select ARCH_HAS_REFCOUNT

diff --git a/arch/x86/include/asm/dma-direct.h b/arch/x86/include/asm/dma-direct.h
new file mode 100644
index 000000000000..1295bc622ebe
--- /dev/null
+++ b/arch/x86/include/asm/dma-direct.h

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ASM_X86_DMA_DIRECT_H
+#define ASM_X86_DMA_DIRECT_H 1
+
+#include <linux/mem_encrypt.h>
+
+#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
+bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+#else
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	if (!dev->dma_mask)
+		return 0;
+
+	return addr + size - 1 <= *dev->dma_mask;
+}
+
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return __sme_set(paddr);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return __sme_clr(daddr);
+}
+#endif /* CONFIG_X86_DMA_REMAP */
+#endif /* ASM_X86_DMA_DIRECT_H */

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 0350d99bb8fd..dfdc9357a349 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h

@@ -12,7 +12,6 @@
 #include <asm/io.h>
 #include <asm/swiotlb.h>
 #include <linux/dma-contiguous.h>
-#include <linux/mem_encrypt.h>
 
 #ifdef CONFIG_ISA
 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)

@@ -42,31 +41,6 @@ extern void dma_generic_free_coherent(struct device *dev, size_t size,
 				      void *vaddr, dma_addr_t dma_addr,
 				      unsigned long attrs);
 
-#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
-extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
-extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
-#else
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return 0;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return __sme_set(paddr);
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return __sme_clr(daddr);
-}
-#endif /* CONFIG_X86_DMA_REMAP */
-
 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
 						    gfp_t gfp)
 {

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index cc0e8bc0ea3f..ecd486cb06ab 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c

@@ -31,6 +31,7 @@
 #include <linux/io.h>
 #include <linux/gfp.h>
 #include <linux/atomic.h>
+#include <linux/dma-direct.h>
 #include <asm/mtrr.h>
 #include <asm/pgtable.h>
 #include <asm/proto.h>

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 599d7462eccc..8439e6de6156 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/dma-debug.h>
 #include <linux/dmar.h>
 #include <linux/export.h>

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 8ac9d1fe0373..8b8ff98486de 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Fallback functions when the main IOMMU code is not compiled in. This
    code is roughly equivalent to i386. */
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/scatterlist.h>
 #include <linux/string.h>
 #include <linux/gfp.h>

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 53bd05ea90d8..9d3e35c33d94 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c

@@ -6,7 +6,7 @@
 #include <linux/init.h>
 #include <linux/swiotlb.h>
 #include <linux/bootmem.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/mem_encrypt.h>
 
 #include <asm/iommu.h>

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index d9a9e9fc75dd..764b916ef7da 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c

@@ -15,7 +15,7 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <linux/mm.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/swiotlb.h>
 #include <linux/mem_encrypt.h>

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 53d600217973..75577c1490c4 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c

@@ -26,6 +26,7 @@
 #include <linux/pci_ids.h>
 #include <linux/export.h>
 #include <linux/list.h>
+#include <linux/dma-direct.h>
 #include <asm/iommu.h>
 
 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)

diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 153bf2370988..44098800dad7 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h

@@ -23,14 +23,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &xtensa_dma_map_ops;
 }
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return (dma_addr_t)paddr;
-}
-
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return (phys_addr_t)daddr;
-}
-
 #endif	/* _XTENSA_DMA_MAPPING_H */

diff --git a/drivers/crypto/marvell/cesa.c b/drivers/crypto/marvell/cesa.c
index 293832488cc9..3a0c40081ffb 100644
--- a/drivers/crypto/marvell/cesa.c
+++ b/drivers/crypto/marvell/cesa.c

@@ -24,6 +24,7 @@
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/dma-direct.h> /* XXX: drivers shall never use this directly! */
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>

diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
index 2656c1ac5646..411cdfd12a85 100644
--- a/drivers/mtd/nand/qcom_nandc.c
+++ b/drivers/mtd/nand/qcom_nandc.c

@@ -23,6 +23,7 @@
 #include <linux/of_device.h>
 #include <linux/delay.h>
 #include <linux/dma/qcom_bam_dma.h>
+#include <linux/dma-direct.h> /* XXX: drivers shall never use this directly! */
 
 /* NANDc reg offsets */
 #define	NAND_FLASH_CMD			0x00

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 82fc54f8eb77..5bb72d3f8337 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c

@@ -36,7 +36,7 @@
 #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
 
 #include <linux/bootmem.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/export.h>
 #include <xen/swiotlb-xen.h>
 #include <xen/page.h>

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
new file mode 100644
index 000000000000..2cc1b6558944
--- /dev/null
+++ b/include/linux/dma-direct.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_DMA_DIRECT_H
+#define _LINUX_DMA_DIRECT_H 1
+
+#include <linux/dma-mapping.h>
+
+#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
+#include <asm/dma-direct.h>
+#else
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	dma_addr_t dev_addr = (dma_addr_t)paddr;
+
+	return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+{
+	phys_addr_t paddr = (phys_addr_t)dev_addr;
+
+	return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
+}
+
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+{
+	if (!dev->dma_mask)
+		return false;
+
+	return addr + size - 1 <= *dev->dma_mask;
+}
+#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
+#endif /* _LINUX_DMA_DIRECT_H */

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index cea19aaf303c..6583f3512386 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -18,7 +18,7 @@
  */
 
 #include <linux/cache.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/mm.h>
 #include <linux/export.h>
 #include <linux/spinlock.h>

-- 
2.14.2

[PATCH 14/67] dma-mapping: move dma_mark_clean to dma-direct.h

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:33

And unlike the other helpers we don't require a <asm/dma-direct.h> as
this helper is a special case for ia64 only, and this keeps it as
simple as possible.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/include/asm/dma-mapping.h       | 2 --
 arch/arm64/include/asm/dma-mapping.h     | 4 ----
 arch/ia64/Kconfig                        | 1 +
 arch/ia64/include/asm/dma.h              | 2 --
 arch/mips/include/asm/dma-mapping.h      | 2 --
 arch/powerpc/include/asm/swiotlb.h       | 2 --
 arch/tile/include/asm/dma-mapping.h      | 2 --
 arch/unicore32/include/asm/dma-mapping.h | 2 --
 arch/x86/include/asm/swiotlb.h           | 2 --
 include/linux/dma-direct.h               | 9 +++++++++
 10 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 5fb1b7fbdfbe..e5d9020c9ee1 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h

@@ -109,8 +109,6 @@ static inline bool is_device_dma_coherent(struct device *dev)
 	return dev->archdata.dma_coherent;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size) { }
-
 /**
  * arm_dma_alloc - allocate consistent memory for DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index 400fa67d3b5a..b7847eb8a7bb 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h

@@ -50,9 +50,5 @@ static inline bool is_device_dma_coherent(struct device *dev)
 	return dev->archdata.dma_coherent;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size)
-{
-}
-
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_DMA_MAPPING_H */

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 49583c5a5d44..4d18fca885ee 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig

@@ -33,6 +33,7 @@ config IA64
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_VIRT_CPU_ACCOUNTING
+	select ARCH_HAS_DMA_MARK_CLEAN
 	select ARCH_HAS_SG_CHAIN
 	select VIRT_TO_BUS
 	select ARCH_DISCARD_MEMBLOCK

diff --git a/arch/ia64/include/asm/dma.h b/arch/ia64/include/asm/dma.h
index 186850eec934..23604d6a2cb2 100644
--- a/arch/ia64/include/asm/dma.h
+++ b/arch/ia64/include/asm/dma.h

@@ -20,6 +20,4 @@ extern unsigned long MAX_DMA_ADDRESS;
 
 #define free_dma(x)
 
-void dma_mark_clean(void *addr, size_t size);
-
 #endif /* _ASM_IA64_DMA_H */

diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 676c14cfc580..886e75a383f2 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h

@@ -17,8 +17,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return mips_dma_map_ops;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size) {}
-
 #define arch_setup_dma_ops arch_setup_dma_ops
 static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
 				      u64 size, const struct iommu_ops *iommu,

diff --git a/arch/powerpc/include/asm/swiotlb.h b/arch/powerpc/include/asm/swiotlb.h
index 01d45a5fd00b..9341ee804d19 100644
--- a/arch/powerpc/include/asm/swiotlb.h
+++ b/arch/powerpc/include/asm/swiotlb.h

@@ -15,8 +15,6 @@
 
 extern const struct dma_map_ops swiotlb_dma_ops;
 
-static inline void dma_mark_clean(void *addr, size_t size) {}
-
 extern unsigned int ppc_swiotlb_enable;
 int __init swiotlb_setup_bus_notifier(void);

diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 75b8aaa4e70b..d25fce101fc0 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h

@@ -44,8 +44,6 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
 	dev->archdata.dma_offset = off;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size) {}
-
 #define HAVE_ARCH_DMA_SET_MASK 1
 int dma_set_mask(struct device *dev, u64 mask);

diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index 5cb250bf2d8c..f2bfec273aa7 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h

@@ -25,7 +25,5 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &swiotlb_dma_map_ops;
 }
 
-static inline void dma_mark_clean(void *addr, size_t size) {}
-
 #endif /* __KERNEL__ */
 #endif

diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
index bdf9aed40403..1c6a6cb230ff 100644
--- a/arch/x86/include/asm/swiotlb.h
+++ b/arch/x86/include/asm/swiotlb.h

@@ -28,8 +28,6 @@ static inline void pci_swiotlb_late_init(void)
 }
 #endif
 
-static inline void dma_mark_clean(void *addr, size_t size) {}
-
 extern void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 					dma_addr_t *dma_handle, gfp_t flags,
 					unsigned long attrs);

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 2cc1b6558944..10e924b7cba7 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h

@@ -29,4 +29,13 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 	return addr + size - 1 <= *dev->dma_mask;
 }
 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
+
+#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
+void dma_mark_clean(void *addr, size_t size);
+#else
+static inline void dma_mark_clean(void *addr, size_t size)
+{
+}
+#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
+
 #endif /* _LINUX_DMA_DIRECT_H */

-- 
2.14.2

[PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:41

We want to use the dma_direct_ namespace for a generic implementation,
so rename powerpc to the second best choice: dma_nommu_.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/powerpc/include/asm/dma-mapping.h    |  8 ++--
 arch/powerpc/kernel/dma-iommu.c           |  2 +-
 arch/powerpc/kernel/dma-swiotlb.c         |  6 +--
 arch/powerpc/kernel/dma.c                 | 68 +++++++++++++++----------------
 arch/powerpc/kernel/pci-common.c          |  2 +-
 arch/powerpc/kernel/setup-common.c        |  2 +-
 arch/powerpc/platforms/cell/iommu.c       | 28 ++++++-------
 arch/powerpc/platforms/pasemi/iommu.c     |  2 +-
 arch/powerpc/platforms/pasemi/setup.c     |  2 +-
 arch/powerpc/platforms/powernv/pci-ioda.c |  4 +-
 arch/powerpc/platforms/pseries/iommu.c    |  2 +-
 arch/powerpc/platforms/pseries/vio.c      |  2 +-
 arch/powerpc/sysdev/dart_iommu.c          |  4 +-
 arch/powerpc/sysdev/fsl_pci.c             |  2 +-
 drivers/misc/cxl/vphb.c                   |  2 +-
 15 files changed, 68 insertions(+), 68 deletions(-)

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index f6ab51205a85..8fa394520af6 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h

@@ -19,13 +19,13 @@
 #include <asm/swiotlb.h>
 
 /* Some dma direct funcs must be visible for use in other dma_ops */
-extern void *__dma_direct_alloc_coherent(struct device *dev, size_t size,
+extern void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
 					 dma_addr_t *dma_handle, gfp_t flag,
 					 unsigned long attrs);
-extern void __dma_direct_free_coherent(struct device *dev, size_t size,
+extern void __dma_nommu_free_coherent(struct device *dev, size_t size,
 				       void *vaddr, dma_addr_t dma_handle,
 				       unsigned long attrs);
-extern int dma_direct_mmap_coherent(struct device *dev,
+extern int dma_nommu_mmap_coherent(struct device *dev,
 				    struct vm_area_struct *vma,
 				    void *cpu_addr, dma_addr_t handle,
 				    size_t size, unsigned long attrs);

@@ -73,7 +73,7 @@ static inline unsigned long device_to_mask(struct device *dev)
 #ifdef CONFIG_PPC64
 extern struct dma_map_ops dma_iommu_ops;
 #endif
-extern const struct dma_map_ops dma_direct_ops;
+extern const struct dma_map_ops dma_nommu_ops;
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {

diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index 66f33e7f8d40..f9fe2080ceb9 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c

@@ -114,7 +114,7 @@ int dma_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
 struct dma_map_ops dma_iommu_ops = {
 	.alloc			= dma_iommu_alloc_coherent,
 	.free			= dma_iommu_free_coherent,
-	.mmap			= dma_direct_mmap_coherent,
+	.mmap			= dma_nommu_mmap_coherent,
 	.map_sg			= dma_iommu_map_sg,
 	.unmap_sg		= dma_iommu_unmap_sg,
 	.dma_supported		= dma_iommu_dma_supported,

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index d0ea7860e02b..f1e99b9cee97 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c

@@ -47,9 +47,9 @@ static u64 swiotlb_powerpc_get_required(struct device *dev)
  * for everything else.
  */
 const struct dma_map_ops swiotlb_dma_ops = {
-	.alloc = __dma_direct_alloc_coherent,
-	.free = __dma_direct_free_coherent,
-	.mmap = dma_direct_mmap_coherent,
+	.alloc = __dma_nommu_alloc_coherent,
+	.free = __dma_nommu_free_coherent,
+	.mmap = dma_nommu_mmap_coherent,
 	.map_sg = swiotlb_map_sg_attrs,
 	.unmap_sg = swiotlb_unmap_sg_attrs,
 	.dma_supported = swiotlb_dma_supported,

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index df0e7bb97ab5..5d49da094a93 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c

@@ -40,7 +40,7 @@ static u64 __maybe_unused get_pfn_limit(struct device *dev)
 	return pfn;
 }
 
-static int dma_direct_dma_supported(struct device *dev, u64 mask)
+static int dma_nommu_dma_supported(struct device *dev, u64 mask)
 {
 #ifdef CONFIG_PPC64
 	u64 limit = get_dma_offset(dev) + (memblock_end_of_DRAM() - 1);

@@ -62,7 +62,7 @@ static int dma_direct_dma_supported(struct device *dev, u64 mask)
 #endif
 }
 
-void *__dma_direct_alloc_coherent(struct device *dev, size_t size,
+void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
 				  dma_addr_t *dma_handle, gfp_t flag,
 				  unsigned long attrs)
 {

@@ -119,7 +119,7 @@ void *__dma_direct_alloc_coherent(struct device *dev, size_t size,
 #endif
 }
 
-void __dma_direct_free_coherent(struct device *dev, size_t size,
+void __dma_nommu_free_coherent(struct device *dev, size_t size,
 				void *vaddr, dma_addr_t dma_handle,
 				unsigned long attrs)
 {

@@ -130,7 +130,7 @@ void __dma_direct_free_coherent(struct device *dev, size_t size,
 #endif
 }
 
-static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
+static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag,
 				       unsigned long attrs)
 {

@@ -139,8 +139,8 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 	/* The coherent mask may be smaller than the real mask, check if
 	 * we can really use the direct ops
 	 */
-	if (dma_direct_dma_supported(dev, dev->coherent_dma_mask))
-		return __dma_direct_alloc_coherent(dev, size, dma_handle,
+	if (dma_nommu_dma_supported(dev, dev->coherent_dma_mask))
+		return __dma_nommu_alloc_coherent(dev, size, dma_handle,
 						   flag, attrs);
 
 	/* Ok we can't ... do we have an iommu ? If not, fail */

@@ -154,15 +154,15 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 				    dev_to_node(dev));
 }
 
-static void dma_direct_free_coherent(struct device *dev, size_t size,
+static void dma_nommu_free_coherent(struct device *dev, size_t size,
 				     void *vaddr, dma_addr_t dma_handle,
 				     unsigned long attrs)
 {
 	struct iommu_table *iommu;
 
-	/* See comments in dma_direct_alloc_coherent() */
-	if (dma_direct_dma_supported(dev, dev->coherent_dma_mask))
-		return __dma_direct_free_coherent(dev, size, vaddr, dma_handle,
+	/* See comments in dma_nommu_alloc_coherent() */
+	if (dma_nommu_dma_supported(dev, dev->coherent_dma_mask))
+		return __dma_nommu_free_coherent(dev, size, vaddr, dma_handle,
 						  attrs);
 	/* Maybe we used an iommu ... */
 	iommu = get_iommu_table_base(dev);

@@ -175,7 +175,7 @@ static void dma_direct_free_coherent(struct device *dev, size_t size,
 	iommu_free_coherent(iommu, size, vaddr, dma_handle);
 }
 
-int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 			     void *cpu_addr, dma_addr_t handle, size_t size,
 			     unsigned long attrs)
 {

@@ -193,7 +193,7 @@ int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 			       vma->vm_page_prot);
 }
 
-static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
+static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
 			     int nents, enum dma_data_direction direction,
 			     unsigned long attrs)
 {

@@ -213,13 +213,13 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	return nents;
 }
 
-static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg,
+static void dma_nommu_unmap_sg(struct device *dev, struct scatterlist *sg,
 				int nents, enum dma_data_direction direction,
 				unsigned long attrs)
 {
 }
 
-static u64 dma_direct_get_required_mask(struct device *dev)
+static u64 dma_nommu_get_required_mask(struct device *dev)
 {
 	u64 end, mask;

@@ -231,7 +231,7 @@ static u64 dma_direct_get_required_mask(struct device *dev)
 	return mask;
 }
 
-static inline dma_addr_t dma_direct_map_page(struct device *dev,
+static inline dma_addr_t dma_nommu_map_page(struct device *dev,
 					     struct page *page,
 					     unsigned long offset,
 					     size_t size,

@@ -246,7 +246,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
 	return page_to_phys(page) + offset + get_dma_offset(dev);
 }
 
-static inline void dma_direct_unmap_page(struct device *dev,
+static inline void dma_nommu_unmap_page(struct device *dev,
 					 dma_addr_t dma_address,
 					 size_t size,
 					 enum dma_data_direction direction,

@@ -255,7 +255,7 @@ static inline void dma_direct_unmap_page(struct device *dev,
 }
 
 #ifdef CONFIG_NOT_COHERENT_CACHE
-static inline void dma_direct_sync_sg(struct device *dev,
+static inline void dma_nommu_sync_sg(struct device *dev,
 		struct scatterlist *sgl, int nents,
 		enum dma_data_direction direction)
 {

@@ -266,7 +266,7 @@ static inline void dma_direct_sync_sg(struct device *dev,
 		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 }
 
-static inline void dma_direct_sync_single(struct device *dev,
+static inline void dma_nommu_sync_single(struct device *dev,
 					  dma_addr_t dma_handle, size_t size,
 					  enum dma_data_direction direction)
 {

@@ -274,25 +274,25 @@ static inline void dma_direct_sync_single(struct device *dev,
 }
 #endif
 
-const struct dma_map_ops dma_direct_ops = {
-	.alloc				= dma_direct_alloc_coherent,
-	.free				= dma_direct_free_coherent,
-	.mmap				= dma_direct_mmap_coherent,
-	.map_sg				= dma_direct_map_sg,
-	.unmap_sg			= dma_direct_unmap_sg,
-	.dma_supported			= dma_direct_dma_supported,
-	.map_page			= dma_direct_map_page,
-	.unmap_page			= dma_direct_unmap_page,
-	.get_required_mask		= dma_direct_get_required_mask,
+const struct dma_map_ops dma_nommu_ops = {
+	.alloc				= dma_nommu_alloc_coherent,
+	.free				= dma_nommu_free_coherent,
+	.mmap				= dma_nommu_mmap_coherent,
+	.map_sg				= dma_nommu_map_sg,
+	.unmap_sg			= dma_nommu_unmap_sg,
+	.dma_supported			= dma_nommu_dma_supported,
+	.map_page			= dma_nommu_map_page,
+	.unmap_page			= dma_nommu_unmap_page,
+	.get_required_mask		= dma_nommu_get_required_mask,
 #ifdef CONFIG_NOT_COHERENT_CACHE
-	.sync_single_for_cpu 		= dma_direct_sync_single,
-	.sync_single_for_device 	= dma_direct_sync_single,
-	.sync_sg_for_cpu 		= dma_direct_sync_sg,
-	.sync_sg_for_device 		= dma_direct_sync_sg,
+	.sync_single_for_cpu 		= dma_nommu_sync_single,
+	.sync_single_for_device 	= dma_nommu_sync_single,
+	.sync_sg_for_cpu 		= dma_nommu_sync_sg,
+	.sync_sg_for_device 		= dma_nommu_sync_sg,
 #endif
 	.is_phys			= true,
 };
-EXPORT_SYMBOL(dma_direct_ops);
+EXPORT_SYMBOL(dma_nommu_ops);
 
 int dma_set_coherent_mask(struct device *dev, u64 mask)
 {

@@ -303,7 +303,7 @@ int dma_set_coherent_mask(struct device *dev, u64 mask)
 		 * is no dma_op->set_coherent_mask() so we have to do
 		 * things the hard way:
 		 */
-		if (get_dma_ops(dev) != &dma_direct_ops ||
+		if (get_dma_ops(dev) != &dma_nommu_ops ||
 		    get_iommu_table_base(dev) == NULL ||
 		    !dma_iommu_dma_supported(dev, mask))
 			return -EIO;

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 0ac7aa346c69..590f4d0a6cb1 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c

@@ -60,7 +60,7 @@ resource_size_t isa_mem_base;
 EXPORT_SYMBOL(isa_mem_base);
 
 
-static const struct dma_map_ops *pci_dma_ops = &dma_direct_ops;
+static const struct dma_map_ops *pci_dma_ops = &dma_nommu_ops;
 
 void set_pci_dma_ops(const struct dma_map_ops *dma_ops)
 {

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 9d213542a48b..9b89df1e71ab 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c

@@ -791,7 +791,7 @@ void arch_setup_pdev_archdata(struct platform_device *pdev)
 {
 	pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 	pdev->dev.dma_mask = &pdev->archdata.dma_mask;
- 	set_dma_ops(&pdev->dev, &dma_direct_ops);
+ 	set_dma_ops(&pdev->dev, &dma_nommu_ops);
 }
 
 static __init void print_system_info(void)

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 4b91ad08eefd..12352a58072a 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c

@@ -541,7 +541,7 @@ static struct cbe_iommu *cell_iommu_for_node(int nid)
 	return NULL;
 }
 
-static unsigned long cell_dma_direct_offset;
+static unsigned long cell_dma_nommu_offset;
 
 static unsigned long dma_iommu_fixed_base;

@@ -580,7 +580,7 @@ static void *dma_fixed_alloc_coherent(struct device *dev, size_t size,
 					    device_to_mask(dev), flag,
 					    dev_to_node(dev));
 	else
-		return dma_direct_ops.alloc(dev, size, dma_handle, flag,
+		return dma_nommu_ops.alloc(dev, size, dma_handle, flag,
 					    attrs);
 }

@@ -592,7 +592,7 @@ static void dma_fixed_free_coherent(struct device *dev, size_t size,
 		iommu_free_coherent(cell_get_iommu_table(dev), size, vaddr,
 				    dma_handle);
 	else
-		dma_direct_ops.free(dev, size, vaddr, dma_handle, attrs);
+		dma_nommu_ops.free(dev, size, vaddr, dma_handle, attrs);
 }
 
 static dma_addr_t dma_fixed_map_page(struct device *dev, struct page *page,

@@ -601,7 +601,7 @@ static dma_addr_t dma_fixed_map_page(struct device *dev, struct page *page,
 				     unsigned long attrs)
 {
 	if (iommu_fixed_is_weak == (attrs & DMA_ATTR_WEAK_ORDERING))
-		return dma_direct_ops.map_page(dev, page, offset, size,
+		return dma_nommu_ops.map_page(dev, page, offset, size,
 					       direction, attrs);
 	else
 		return iommu_map_page(dev, cell_get_iommu_table(dev), page,

@@ -614,7 +614,7 @@ static void dma_fixed_unmap_page(struct device *dev, dma_addr_t dma_addr,
 				 unsigned long attrs)
 {
 	if (iommu_fixed_is_weak == (attrs & DMA_ATTR_WEAK_ORDERING))
-		dma_direct_ops.unmap_page(dev, dma_addr, size, direction,
+		dma_nommu_ops.unmap_page(dev, dma_addr, size, direction,
 					  attrs);
 	else
 		iommu_unmap_page(cell_get_iommu_table(dev), dma_addr, size,

@@ -626,7 +626,7 @@ static int dma_fixed_map_sg(struct device *dev, struct scatterlist *sg,
 			   unsigned long attrs)
 {
 	if (iommu_fixed_is_weak == (attrs & DMA_ATTR_WEAK_ORDERING))
-		return dma_direct_ops.map_sg(dev, sg, nents, direction, attrs);
+		return dma_nommu_ops.map_sg(dev, sg, nents, direction, attrs);
 	else
 		return ppc_iommu_map_sg(dev, cell_get_iommu_table(dev), sg,
 					nents, device_to_mask(dev),

@@ -638,7 +638,7 @@ static void dma_fixed_unmap_sg(struct device *dev, struct scatterlist *sg,
 			       unsigned long attrs)
 {
 	if (iommu_fixed_is_weak == (attrs & DMA_ATTR_WEAK_ORDERING))
-		dma_direct_ops.unmap_sg(dev, sg, nents, direction, attrs);
+		dma_nommu_ops.unmap_sg(dev, sg, nents, direction, attrs);
 	else
 		ppc_iommu_unmap_sg(cell_get_iommu_table(dev), sg, nents,
 				   direction, attrs);

@@ -661,8 +661,8 @@ static void cell_dma_dev_setup(struct device *dev)
 {
 	if (get_pci_dma_ops() == &dma_iommu_ops)
 		set_iommu_table_base(dev, cell_get_iommu_table(dev));
-	else if (get_pci_dma_ops() == &dma_direct_ops)
-		set_dma_offset(dev, cell_dma_direct_offset);
+	else if (get_pci_dma_ops() == &dma_nommu_ops)
+		set_dma_offset(dev, cell_dma_nommu_offset);
 	else
 		BUG();
 }

@@ -810,14 +810,14 @@ static int __init cell_iommu_init_disabled(void)
 	unsigned long base = 0, size;
 
 	/* When no iommu is present, we use direct DMA ops */
-	set_pci_dma_ops(&dma_direct_ops);
+	set_pci_dma_ops(&dma_nommu_ops);
 
 	/* First make sure all IOC translation is turned off */
 	cell_disable_iommus();
 
 	/* If we have no Axon, we set up the spider DMA magic offset */
 	if (of_find_node_by_name(NULL, "axon") == NULL)
-		cell_dma_direct_offset = SPIDER_DMA_OFFSET;
+		cell_dma_nommu_offset = SPIDER_DMA_OFFSET;
 
 	/* Now we need to check to see where the memory is mapped
 	 * in PCI space. We assume that all busses use the same dma

@@ -851,13 +851,13 @@ static int __init cell_iommu_init_disabled(void)
 		return -ENODEV;
 	}
 
-	cell_dma_direct_offset += base;
+	cell_dma_nommu_offset += base;
 
-	if (cell_dma_direct_offset != 0)
+	if (cell_dma_nommu_offset != 0)
 		cell_pci_controller_ops.dma_dev_setup = cell_pci_dma_dev_setup;
 
 	printk("iommu: disabled, direct DMA offset is 0x%lx\n",
-	       cell_dma_direct_offset);
+	       cell_dma_nommu_offset);
 
 	return 0;
 }

diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c
index 7fec04de27fc..78b80cbd9768 100644
--- a/arch/powerpc/platforms/pasemi/iommu.c
+++ b/arch/powerpc/platforms/pasemi/iommu.c

@@ -186,7 +186,7 @@ static void pci_dma_dev_setup_pasemi(struct pci_dev *dev)
 	 */
 	if (dev->vendor == 0x1959 && dev->device == 0xa007 &&
 	    !firmware_has_feature(FW_FEATURE_LPAR)) {
-		dev->dev.dma_ops = &dma_direct_ops;
+		dev->dev.dma_ops = &dma_nommu_ops;
 		/*
 		 * Set the coherent DMA mask to prevent the iommu
 		 * being used unnecessarily

diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c
index c4a3e93dc324..d0b8ae53660d 100644
--- a/arch/powerpc/platforms/pasemi/setup.c
+++ b/arch/powerpc/platforms/pasemi/setup.c

@@ -363,7 +363,7 @@ static int pcmcia_notify(struct notifier_block *nb, unsigned long action,
 		return 0;
 
 	/* We use the direct ops for localbus */
-	dev->dma_ops = &dma_direct_ops;
+	dev->dma_ops = &dma_nommu_ops;
 
 	return 0;
 }

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 749055553064..9582aeb1fe4c 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c

@@ -1850,7 +1850,7 @@ static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
 
 	if (bypass) {
 		dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n");
-		set_dma_ops(&pdev->dev, &dma_direct_ops);
+		set_dma_ops(&pdev->dev, &dma_nommu_ops);
 	} else {
 		/*
 		 * If the device can't set the TCE bypass bit but still wants

@@ -1868,7 +1868,7 @@ static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
 				return rc;
 			/* 4GB offset bypasses 32-bit space */
 			set_dma_offset(&pdev->dev, (1ULL << 32));
-			set_dma_ops(&pdev->dev, &dma_direct_ops);
+			set_dma_ops(&pdev->dev, &dma_nommu_ops);
 		} else if (dma_mask >> 32 && dma_mask != DMA_BIT_MASK(64)) {
 			/*
 			 * Fail the request if a DMA mask between 32 and 64 bits

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 69921f72e2da..eaa11334fc8c 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c

@@ -1231,7 +1231,7 @@ static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
 			if (dma_offset != 0) {
 				dev_info(dev, "Using 64-bit direct DMA at offset %llx\n", dma_offset);
 				set_dma_offset(dev, dma_offset);
-				set_dma_ops(dev, &dma_direct_ops);
+				set_dma_ops(dev, &dma_nommu_ops);
 				ddw_enabled = true;
 			}
 		}

diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index d86938260a86..49e04ec19238 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c

@@ -618,7 +618,7 @@ static u64 vio_dma_get_required_mask(struct device *dev)
 static const struct dma_map_ops vio_dma_mapping_ops = {
 	.alloc             = vio_dma_iommu_alloc_coherent,
 	.free              = vio_dma_iommu_free_coherent,
-	.mmap		   = dma_direct_mmap_coherent,
+	.mmap		   = dma_nommu_mmap_coherent,
 	.map_sg            = vio_dma_iommu_map_sg,
 	.unmap_sg          = vio_dma_iommu_unmap_sg,
 	.map_page          = vio_dma_iommu_map_page,

diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index 3573d54b2770..a6198d4f0f03 100644
--- a/arch/powerpc/sysdev/dart_iommu.c
+++ b/arch/powerpc/sysdev/dart_iommu.c

@@ -402,7 +402,7 @@ static int dart_dma_set_mask(struct device *dev, u64 dma_mask)
 	 */
 	if (dart_device_on_pcie(dev) && dma_mask >= DMA_BIT_MASK(40)) {
 		dev_info(dev, "Using 64-bit DMA iommu bypass\n");
-		set_dma_ops(dev, &dma_direct_ops);
+		set_dma_ops(dev, &dma_nommu_ops);
 	} else {
 		dev_info(dev, "Using 32-bit DMA via iommu\n");
 		set_dma_ops(dev, &dma_iommu_ops);

@@ -446,7 +446,7 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops)
 	controller_ops->dma_bus_setup = NULL;
 
 	/* Setup pci_dma ops */
-	set_pci_dma_ops(&dma_direct_ops);
+	set_pci_dma_ops(&dma_nommu_ops);
 }
 
 #ifdef CONFIG_PM

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 22d98057f773..e4d0133bbeeb 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c

@@ -135,7 +135,7 @@ static int fsl_pci_dma_set_mask(struct device *dev, u64 dma_mask)
 	 * mapping that allows addressing any RAM address from across PCI.
 	 */
 	if (dev_is_pci(dev) && dma_mask >= pci64_dma_offset * 2 - 1) {
-		set_dma_ops(dev, &dma_direct_ops);
+		set_dma_ops(dev, &dma_nommu_ops);
 		set_dma_offset(dev, pci64_dma_offset);
 	}

diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index 512a4897dbf6..7fd0bdc1436a 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c

@@ -54,7 +54,7 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
 		return false;
 	}
 
-	set_dma_ops(&dev->dev, &dma_direct_ops);
+	set_dma_ops(&dev->dev, &dma_nommu_ops);
 	set_dma_offset(&dev->dev, PAGE_OFFSET);
 
 	return _cxl_pci_associate_default_context(dev, afu);

-- 
2.14.2

[PATCH 17/67] microblaze: rename dma_direct to dma_microblaze

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:49

This frees the dma_direct_* namespace for a generic implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/microblaze/include/asm/dma-mapping.h |  4 +--
 arch/microblaze/kernel/dma.c              | 50 +++++++++++++++----------------
 2 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
index 6b9ea39405b8..add50c1373bf 100644
--- a/arch/microblaze/include/asm/dma-mapping.h
+++ b/arch/microblaze/include/asm/dma-mapping.h

@@ -18,11 +18,11 @@
 /*
  * Available generic sets of operations
  */
-extern const struct dma_map_ops dma_direct_ops;
+extern const struct dma_map_ops dma_nommu_ops;
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	return &dma_direct_ops;
+	return &dma_nommu_ops;
 }
 
 #endif	/* _ASM_MICROBLAZE_DMA_MAPPING_H */

diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 2a9a0ec14c46..364b0ac41452 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c

@@ -17,7 +17,7 @@
 
 #define NOT_COHERENT_CACHE
 
-static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
+static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag,
 				       unsigned long attrs)
 {

@@ -42,7 +42,7 @@ static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 #endif
 }
 
-static void dma_direct_free_coherent(struct device *dev, size_t size,
+static void dma_nommu_free_coherent(struct device *dev, size_t size,
 				     void *vaddr, dma_addr_t dma_handle,
 				     unsigned long attrs)
 {

@@ -69,7 +69,7 @@ static inline void __dma_sync(unsigned long paddr,
 	}
 }
 
-static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
+static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
 			     int nents, enum dma_data_direction direction,
 			     unsigned long attrs)
 {

@@ -89,12 +89,12 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	return nents;
 }
 
-static int dma_direct_dma_supported(struct device *dev, u64 mask)
+static int dma_nommu_dma_supported(struct device *dev, u64 mask)
 {
 	return 1;
 }
 
-static inline dma_addr_t dma_direct_map_page(struct device *dev,
+static inline dma_addr_t dma_nommu_map_page(struct device *dev,
 					     struct page *page,
 					     unsigned long offset,
 					     size_t size,

@@ -106,7 +106,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
 	return page_to_phys(page) + offset;
 }
 
-static inline void dma_direct_unmap_page(struct device *dev,
+static inline void dma_nommu_unmap_page(struct device *dev,
 					 dma_addr_t dma_address,
 					 size_t size,
 					 enum dma_data_direction direction,

@@ -122,7 +122,7 @@ static inline void dma_direct_unmap_page(struct device *dev,
 }
 
 static inline void
-dma_direct_sync_single_for_cpu(struct device *dev,
+dma_nommu_sync_single_for_cpu(struct device *dev,
 			       dma_addr_t dma_handle, size_t size,
 			       enum dma_data_direction direction)
 {

@@ -136,7 +136,7 @@ dma_direct_sync_single_for_cpu(struct device *dev,
 }
 
 static inline void
-dma_direct_sync_single_for_device(struct device *dev,
+dma_nommu_sync_single_for_device(struct device *dev,
 				  dma_addr_t dma_handle, size_t size,
 				  enum dma_data_direction direction)
 {

@@ -150,7 +150,7 @@ dma_direct_sync_single_for_device(struct device *dev,
 }
 
 static inline void
-dma_direct_sync_sg_for_cpu(struct device *dev,
+dma_nommu_sync_sg_for_cpu(struct device *dev,
 			   struct scatterlist *sgl, int nents,
 			   enum dma_data_direction direction)
 {

@@ -164,7 +164,7 @@ dma_direct_sync_sg_for_cpu(struct device *dev,
 }
 
 static inline void
-dma_direct_sync_sg_for_device(struct device *dev,
+dma_nommu_sync_sg_for_device(struct device *dev,
 			      struct scatterlist *sgl, int nents,
 			      enum dma_data_direction direction)
 {

@@ -178,7 +178,7 @@ dma_direct_sync_sg_for_device(struct device *dev,
 }
 
 static
-int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 			     void *cpu_addr, dma_addr_t handle, size_t size,
 			     unsigned long attrs)
 {

@@ -204,21 +204,21 @@ int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 #endif
 }
 
-const struct dma_map_ops dma_direct_ops = {
-	.alloc		= dma_direct_alloc_coherent,
-	.free		= dma_direct_free_coherent,
-	.mmap		= dma_direct_mmap_coherent,
-	.map_sg		= dma_direct_map_sg,
-	.dma_supported	= dma_direct_dma_supported,
-	.map_page	= dma_direct_map_page,
-	.unmap_page	= dma_direct_unmap_page,
-	.sync_single_for_cpu		= dma_direct_sync_single_for_cpu,
-	.sync_single_for_device		= dma_direct_sync_single_for_device,
-	.sync_sg_for_cpu		= dma_direct_sync_sg_for_cpu,
-	.sync_sg_for_device		= dma_direct_sync_sg_for_device,
-	.is_phys	= true,
+const struct dma_map_ops dma_nommu_ops = {
+	.alloc			= dma_nommu_alloc_coherent,
+	.free			= dma_nommu_free_coherent,
+	.mmap			= dma_nommu_mmap_coherent,
+	.map_sg			= dma_nommu_map_sg,
+	.dma_supported		= dma_nommu_dma_supported,
+	.map_page		= dma_nommu_map_page,
+	.unmap_page		= dma_nommu_unmap_page,
+	.sync_single_for_cpu	= dma_nommu_sync_single_for_cpu,
+	.sync_single_for_device	= dma_nommu_sync_single_for_device,
+	.sync_sg_for_cpu	= dma_nommu_sync_sg_for_cpu,
+	.sync_sg_for_device	= dma_nommu_sync_sg_for_device,
+	.is_phys		= true,
 };
-EXPORT_SYMBOL(dma_direct_ops);
+EXPORT_SYMBOL(dma_nommu_ops);
 
 /* Number of entries preallocated for DMA-API debugging */
 #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)

-- 
2.14.2

[PATCH 19/67] microblaze: remove the dead !NOT_COHERENT_CACHE dma code

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:20:57

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/microblaze/kernel/dma.c | 28 ----------------------------
 1 file changed, 28 deletions(-)

diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 49b09648679b..031d889670f5 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c

@@ -15,42 +15,18 @@
 #include <linux/bug.h>
 #include <asm/cacheflush.h>
 
-#define NOT_COHERENT_CACHE
-
 static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag,
 				       unsigned long attrs)
 {
-#ifdef NOT_COHERENT_CACHE
 	return consistent_alloc(flag, size, dma_handle);
-#else
-	void *ret;
-	struct page *page;
-	int node = dev_to_node(dev);
-
-	/* ignore region specifiers */
-	flag  &= ~(__GFP_HIGHMEM);
-
-	page = alloc_pages_node(node, flag, get_order(size));
-	if (page == NULL)
-		return NULL;
-	ret = page_address(page);
-	memset(ret, 0, size);
-	*dma_handle = virt_to_phys(ret);
-
-	return ret;
-#endif
 }
 
 static void dma_nommu_free_coherent(struct device *dev, size_t size,
 				     void *vaddr, dma_addr_t dma_handle,
 				     unsigned long attrs)
 {
-#ifdef NOT_COHERENT_CACHE
 	consistent_free(size, vaddr);
-#else
-	free_pages((unsigned long)vaddr, get_order(size));
-#endif
 }
 
 static inline void __dma_sync(unsigned long paddr,

@@ -186,12 +162,8 @@ int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
 	if (off >= count || user_count > (count - off))
 		return -ENXIO;
 
-#ifdef NOT_COHERENT_CACHE
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 	pfn = consistent_virt_to_pfn(cpu_addr);
-#else
-	pfn = virt_to_pfn(cpu_addr);
-#endif
 	return remap_pfn_range(vma, vma->vm_start, pfn + off,
 			       vma->vm_end - vma->vm_start, vma->vm_page_prot);
 #else

-- 
2.14.2

[PATCH 20/67] s390: move s390_pci_dma_ops to asm/pci_dma.h

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:00

This is not needed in drivers, so move it to a private header.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/s390/include/asm/dma-mapping.h | 2 --
 arch/s390/include/asm/pci_dma.h     | 3 +++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index 2ec7240c1ada..bdc2455483f6 100644
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h

@@ -9,8 +9,6 @@
 #include <linux/dma-debug.h>
 #include <linux/io.h>
 
-extern const struct dma_map_ops s390_pci_dma_ops;
-
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &dma_noop_ops;

diff --git a/arch/s390/include/asm/pci_dma.h b/arch/s390/include/asm/pci_dma.h
index e8d9161fa17a..419fac7a62c0 100644
--- a/arch/s390/include/asm/pci_dma.h
+++ b/arch/s390/include/asm/pci_dma.h

@@ -201,4 +201,7 @@ void dma_cleanup_tables(unsigned long *);
 unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr);
 void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags);
 
+extern const struct dma_map_ops s390_pci_dma_ops;
+
+
 #endif

-- 
2.14.2

[PATCH 22/67] dma-mapping: clear harmful GFP_* flags in common code

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:05

Life the code from x86 so that we behave consistently.  In the future we
should probably warn if any of these is set.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/cris/arch-v32/drivers/pci/dma.c      | 3 ---
 arch/h8300/kernel/dma.c                   | 3 ---
 arch/m68k/kernel/dma.c                    | 2 --
 arch/mips/cavium-octeon/dma-octeon.c      | 3 ---
 arch/mips/loongson64/common/dma-swiotlb.c | 3 ---
 arch/mips/mm/dma-default.c                | 3 ---
 arch/mips/netlogic/common/nlm-dma.c       | 3 ---
 arch/mn10300/mm/dma-alloc.c               | 3 ---
 arch/nios2/mm/dma-mapping.c               | 3 ---
 arch/powerpc/kernel/dma.c                 | 3 ---
 arch/x86/kernel/pci-dma.c                 | 2 --
 include/linux/dma-mapping.h               | 7 +++++++
 12 files changed, 7 insertions(+), 31 deletions(-)

diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c
index aa16ce27e036..c7e3056885d3 100644
--- a/arch/cris/arch-v32/drivers/pci/dma.c
+++ b/arch/cris/arch-v32/drivers/pci/dma.c

@@ -22,9 +22,6 @@ static void *v32_dma_alloc(struct device *dev, size_t size,
 {
 	void *ret;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
-
 	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
 		gfp |= GFP_DMA;

diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c
index 0e92214310c4..4e27b74df973 100644
--- a/arch/h8300/kernel/dma.c
+++ b/arch/h8300/kernel/dma.c

@@ -16,9 +16,6 @@ static void *dma_alloc(struct device *dev, size_t size,
 {
 	void *ret;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
-
 	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
 		gfp |= GFP_DMA;
 	ret = (void *)__get_free_pages(gfp, get_order(size));

diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
index e0167418072b..2f3492e8295c 100644
--- a/arch/m68k/kernel/dma.c
+++ b/arch/m68k/kernel/dma.c

@@ -76,8 +76,6 @@ static void *m68k_dma_alloc(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
 	void *ret;
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
 
 	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
 		gfp |= GFP_DMA;

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index c64bd87f0b6e..5baf79fce643 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c

@@ -161,9 +161,6 @@ static void *octeon_dma_alloc_coherent(struct device *dev, size_t size,
 {
 	void *ret;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
-
 	if (IS_ENABLED(CONFIG_ZONE_DMA) && dev == NULL)
 		gfp |= __GFP_DMA;
 	else if (IS_ENABLED(CONFIG_ZONE_DMA) &&

diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c
index ef07740cee61..15388c24a504 100644
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/common/dma-swiotlb.c

@@ -15,9 +15,6 @@ static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
 {
 	void *ret;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
-
 	if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) ||
 	    (IS_ENABLED(CONFIG_ZONE_DMA) &&
 	     dev->coherent_dma_mask < DMA_BIT_MASK(32)))

diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index 3cd93e0c7a29..6f6b1399e98e 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c

@@ -93,9 +93,6 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
 {
 	gfp_t dma_flag;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
-
 #ifdef CONFIG_ISA
 	if (dev == NULL)
 		dma_flag = __GFP_DMA;

diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
index 0ec9d9da6d51..49c975b6aa28 100644
--- a/arch/mips/netlogic/common/nlm-dma.c
+++ b/arch/mips/netlogic/common/nlm-dma.c

@@ -47,9 +47,6 @@ static char *nlm_swiotlb;
 static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
 	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
-
 #ifdef CONFIG_ZONE_DMA32
 	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
 		gfp |= __GFP_DMA32;

diff --git a/arch/mn10300/mm/dma-alloc.c b/arch/mn10300/mm/dma-alloc.c
index 55876a87c247..2629f1f4b04e 100644
--- a/arch/mn10300/mm/dma-alloc.c
+++ b/arch/mn10300/mm/dma-alloc.c

@@ -37,9 +37,6 @@ static void *mn10300_dma_alloc(struct device *dev, size_t size,
 		goto done;
 	}
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
-
 	if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
 		gfp |= GFP_DMA;

diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index 599bcc09c9e7..9e54f8cb3459 100644
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c

@@ -63,9 +63,6 @@ static void *nios2_dma_alloc(struct device *dev, size_t size,
 {
 	void *ret;
 
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
-
 	/* optimized page clearing */
 	gfp |= __GFP_ZERO;

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 5d49da094a93..1723001d5de1 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c

@@ -105,9 +105,6 @@ void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
 	};
 #endif /* CONFIG_FSL_SOC */
 
-	/* ignore region specifiers */
-	flag  &= ~(__GFP_HIGHMEM);
-
 	page = alloc_pages_node(node, flag, get_order(size));
 	if (page == NULL)
 		return NULL;

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 8439e6de6156..61a8f1cb3829 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -87,7 +87,6 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 
 	dma_mask = dma_alloc_coherent_mask(dev, flag);
 
-	flag &= ~__GFP_ZERO;
 again:
 	page = NULL;
 	/* CMA can be used only in the context which permits sleeping */

@@ -139,7 +138,6 @@ bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
 	if (!*dev)
 		*dev = &x86_dma_fallback_dev;
 
-	*gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 	*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
 
 	if (!is_device_dma_capable(*dev))

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 2779d544485c..fd5197af882a 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -525,6 +525,13 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 	if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
 		return cpu_addr;
 
+	/*
+	 * Let the implementation decide on the zone to allocate from, and
+	 * decide on the way of zeroing the memory given that the memory
+	 * returned should always be zeroed.
+	 */
+	flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO);
+
 	if (!arch_dma_alloc_attrs(&dev, &flag))
 		return NULL;
 	if (!ops->alloc)

-- 
2.14.2

[PATCH 24/67] dma-mapping: provide a generic asm/dma-mapping.h

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:12

For architectures that just use the generic dma_noop_ops we can provide
a generic version of dma-mapping.h.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 MAINTAINERS                          |  1 +
 arch/m32r/include/asm/Kbuild         |  1 +
 arch/m32r/include/asm/dma-mapping.h  | 17 -----------------
 arch/riscv/include/asm/Kbuild        |  1 +
 arch/riscv/include/asm/dma-mapping.h | 30 ------------------------------
 arch/s390/include/asm/Kbuild         |  1 +
 arch/s390/include/asm/dma-mapping.h  | 17 -----------------
 include/asm-generic/dma-mapping.h    | 10 ++++++++++
 8 files changed, 14 insertions(+), 64 deletions(-)
 delete mode 100644 arch/m32r/include/asm/dma-mapping.h
 delete mode 100644 arch/riscv/include/asm/dma-mapping.h
 delete mode 100644 arch/s390/include/asm/dma-mapping.h
 create mode 100644 include/asm-generic/dma-mapping.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 7521b063b499..a8b35d9f41b2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -4340,6 +4340,7 @@ F:	lib/dma-noop.c
 F:	lib/dma-virt.c
 F:	drivers/base/dma-mapping.c
 F:	drivers/base/dma-coherent.c
+F:	include/asm-generic/dma-mapping.h
 F:	include/linux/dma-direct.h
 F:	include/linux/dma-mapping.h

diff --git a/arch/m32r/include/asm/Kbuild b/arch/m32r/include/asm/Kbuild
index 7e11b125c35e..ca83fda8177b 100644
--- a/arch/m32r/include/asm/Kbuild
+++ b/arch/m32r/include/asm/Kbuild

@@ -1,5 +1,6 @@
 generic-y += clkdev.h
 generic-y += current.h
+generic-y += dma-mapping.h
 generic-y += exec.h
 generic-y += extable.h
 generic-y += irq_work.h

diff --git a/arch/m32r/include/asm/dma-mapping.h b/arch/m32r/include/asm/dma-mapping.h
deleted file mode 100644
index 8967fb659691..000000000000
--- a/arch/m32r/include/asm/dma-mapping.h
+++ /dev/null

@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_M32R_DMA_MAPPING_H
-#define _ASM_M32R_DMA_MAPPING_H
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-debug.h>
-#include <linux/io.h>
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	return &dma_noop_ops;
-}
-
-#endif /* _ASM_M32R_DMA_MAPPING_H */

diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index 970460a0b492..197460ccbf21 100644
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild

@@ -7,6 +7,7 @@ generic-y += device.h
 generic-y += div64.h
 generic-y += dma.h
 generic-y += dma-contiguous.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += errno.h
 generic-y += exec.h

diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h
deleted file mode 100644
index 73849e2cc761..000000000000
--- a/arch/riscv/include/asm/dma-mapping.h
+++ /dev/null

@@ -1,30 +0,0 @@
-/*
- * Copyright (C) 2003-2004 Hewlett-Packard Co
- *	David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 2012 ARM Ltd.
- * Copyright (C) 2016 SiFive, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef __ASM_RISCV_DMA_MAPPING_H
-#define __ASM_RISCV_DMA_MAPPING_H
-
-/* Use ops->dma_mapping_error (if it exists) or assume success */
-// #undef DMA_ERROR_CODE
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	return &dma_noop_ops;
-}
-
-#endif	/* __ASM_RISCV_DMA_MAPPING_H */

diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
index 048450869328..dade72be127b 100644
--- a/arch/s390/include/asm/Kbuild
+++ b/arch/s390/include/asm/Kbuild

@@ -4,6 +4,7 @@ generic-y += cacheflush.h
 generic-y += clkdev.h
 generic-y += device.h
 generic-y += dma-contiguous.h
+generic-y += dma-mapping.h
 generic-y += div64.h
 generic-y += emergency-restart.h
 generic-y += export.h

diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
deleted file mode 100644
index bdc2455483f6..000000000000
--- a/arch/s390/include/asm/dma-mapping.h
+++ /dev/null

@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_S390_DMA_MAPPING_H
-#define _ASM_S390_DMA_MAPPING_H
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-debug.h>
-#include <linux/io.h>
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	return &dma_noop_ops;
-}
-
-#endif /* _ASM_S390_DMA_MAPPING_H */

diff --git a/include/asm-generic/dma-mapping.h b/include/asm-generic/dma-mapping.h
new file mode 100644
index 000000000000..164031531d85
--- /dev/null
+++ b/include/asm-generic/dma-mapping.h

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_DMA_MAPPING_H
+#define _ASM_GENERIC_DMA_MAPPING_H
+
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+	return &dma_noop_ops;
+}
+
+#endif /* _ASM_GENERIC_DMA_MAPPING_H */

-- 
2.14.2

[PATCH 25/67] dma-direct: rename dma_noop to dma_direct

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:16

The trivial direct mapping implementation already does a virtual to
physical translation which isn't strictly a noop, and will soon learn
to do non-direct but linear physical to dma translations through the
device offset and a few small tricks.  Rename it to a better fitting
name.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 MAINTAINERS                        |  2 +-
 arch/arm/Kconfig                   |  2 +-
 arch/arm/include/asm/dma-mapping.h |  2 +-
 arch/arm/mm/dma-mapping-nommu.c    |  8 ++++----
 arch/m32r/Kconfig                  |  2 +-
 arch/riscv/Kconfig                 |  2 +-
 arch/s390/Kconfig                  |  2 +-
 include/asm-generic/dma-mapping.h  |  2 +-
 include/linux/dma-mapping.h        |  2 +-
 lib/Kconfig                        |  2 +-
 lib/Makefile                       |  2 +-
 lib/{dma-noop.c => dma-direct.c}   | 35 +++++++++++++++--------------------
 12 files changed, 29 insertions(+), 34 deletions(-)
 rename lib/{dma-noop.c => dma-direct.c} (53%)

diff --git a/MAINTAINERS b/MAINTAINERS
index a8b35d9f41b2..b4005fe06e4c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS

@@ -4336,7 +4336,7 @@ T:	git git://git.infradead.org/users/hch/dma-mapping.git
 W:	http://git.infradead.org/users/hch/dma-mapping.git
 S:	Supported
 F:	lib/dma-debug.c
-F:	lib/dma-noop.c
+F:	lib/dma-direct.c
 F:	lib/dma-virt.c
 F:	drivers/base/dma-mapping.c
 F:	drivers/base/dma-coherent.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 00d889a37965..430a0aa710d6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -25,7 +25,7 @@ config ARM
 	select CLONE_BACKWARDS
 	select CPU_PM if (SUSPEND || CPU_IDLE)
 	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
-	select DMA_NOOP_OPS if !MMU
+	select DMA_DIRECT_OPS if !MMU
 	select EDAC_SUPPORT
 	select EDAC_ATOMIC_SCRUB
 	select GENERIC_ALLOCATOR

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index e5d9020c9ee1..8436f6ade57d 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h

@@ -18,7 +18,7 @@ extern const struct dma_map_ops arm_coherent_dma_ops;
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops;
+	return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_direct_ops;
 }
 
 #ifdef __arch_page_to_dma

diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 1cced700e45a..49e9831dc0f1 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c

@@ -22,7 +22,7 @@
 #include "dma.h"
 
 /*
- *  dma_noop_ops is used if
+ *  dma_direct_ops is used if
  *   - MMU/MPU is off
  *   - cpu is v7m w/o cache support
  *   - device is coherent

@@ -39,7 +39,7 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size,
 				 unsigned long attrs)
 
 {
-	const struct dma_map_ops *ops = &dma_noop_ops;
+	const struct dma_map_ops *ops = &dma_direct_ops;
 	void *ret;
 
 	/*

@@ -70,7 +70,7 @@ static void arm_nommu_dma_free(struct device *dev, size_t size,
 			       void *cpu_addr, dma_addr_t dma_addr,
 			       unsigned long attrs)
 {
-	const struct dma_map_ops *ops = &dma_noop_ops;
+	const struct dma_map_ops *ops = &dma_direct_ops;
 
 	if (attrs & DMA_ATTR_NON_CONSISTENT) {
 		ops->free(dev, size, cpu_addr, dma_addr, attrs);

@@ -214,7 +214,7 @@ EXPORT_SYMBOL(arm_nommu_dma_ops);
 
 static const struct dma_map_ops *arm_nommu_get_dma_map_ops(bool coherent)
 {
-	return coherent ? &dma_noop_ops : &arm_nommu_dma_ops;
+	return coherent ? &dma_direct_ops : &arm_nommu_dma_ops;
 }
 
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 498398d915c1..dd84ee194579 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig

@@ -19,7 +19,7 @@ config M32R
 	select MODULES_USE_ELF_RELA
 	select HAVE_DEBUG_STACKOVERFLOW
 	select CPU_NO_EFFICIENT_FFS
-	select DMA_NOOP_OPS
+	select DMA_DIRECT_OPS
 	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
 
 config SBUS

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 2c6adf12713a..865e14f50c14 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig

@@ -83,7 +83,7 @@ config PGTABLE_LEVELS
 config HAVE_KPROBES
 	def_bool n
 
-config DMA_NOOP_OPS
+config DMA_DIRECT_OPS
 	def_bool y
 
 menu "Platform type"

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 829c67986db7..9376637229c9 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig

@@ -140,7 +140,7 @@ config S390
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_CONTIGUOUS
-	select DMA_NOOP_OPS
+	select DMA_DIRECT_OPS
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_DYNAMIC_FTRACE_WITH_REGS
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS

diff --git a/include/asm-generic/dma-mapping.h b/include/asm-generic/dma-mapping.h
index 164031531d85..880a292d792f 100644
--- a/include/asm-generic/dma-mapping.h
+++ b/include/asm-generic/dma-mapping.h

@@ -4,7 +4,7 @@
 
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	return &dma_noop_ops;
+	return &dma_direct_ops;
 }
 
 #endif /* _ASM_GENERIC_DMA_MAPPING_H */

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 72568bf4fc12..ff3528de5322 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -143,7 +143,7 @@ struct dma_map_ops {
 	bool is_phys;
 };
 
-extern const struct dma_map_ops dma_noop_ops;
+extern const struct dma_map_ops dma_direct_ops;
 extern const struct dma_map_ops dma_virt_ops;
 
 #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))

diff --git a/lib/Kconfig b/lib/Kconfig
index c5e84fbcb30b..9d3d649c9dc9 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig

@@ -409,7 +409,7 @@ config HAS_DMA
 	depends on !NO_DMA
 	default y
 
-config DMA_NOOP_OPS
+config DMA_DIRECT_OPS
 	bool
 	depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
 	default n

diff --git a/lib/Makefile b/lib/Makefile
index d11c48ec8ffd..749851abe85a 100644
--- a/lib/Makefile
+++ b/lib/Makefile

@@ -28,7 +28,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
-lib-$(CONFIG_DMA_NOOP_OPS) += dma-noop.o
+lib-$(CONFIG_DMA_DIRECT_OPS) += dma-direct.o
 lib-$(CONFIG_DMA_VIRT_OPS) += dma-virt.o
 
 lib-y	+= kobject.o klist.o

diff --git a/lib/dma-noop.c b/lib/dma-direct.c
similarity index 53%
rename from lib/dma-noop.c
rename to lib/dma-direct.c
index c3728a0551f5..439db40854b7 100644
--- a/lib/dma-noop.c
+++ b/lib/dma-direct.c

@@ -10,9 +10,8 @@
 #include <linux/scatterlist.h>
 #include <linux/pfn.h>
 
-static void *dma_noop_alloc(struct device *dev, size_t size,
-			    dma_addr_t *dma_handle, gfp_t gfp,
-			    unsigned long attrs)
+static void *dma_direct_alloc(struct device *dev, size_t size,
+		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
 	void *ret;

@@ -23,24 +22,21 @@ static void *dma_noop_alloc(struct device *dev, size_t size,
 	return ret;
 }
 
-static void dma_noop_free(struct device *dev, size_t size,
-			  void *cpu_addr, dma_addr_t dma_addr,
-			  unsigned long attrs)
+static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
+		dma_addr_t dma_addr, unsigned long attrs)
 {
 	free_pages((unsigned long)cpu_addr, get_order(size));
 }
 
-static dma_addr_t dma_noop_map_page(struct device *dev, struct page *page,
-				      unsigned long offset, size_t size,
-				      enum dma_data_direction dir,
-				      unsigned long attrs)
+static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
+		unsigned long offset, size_t size, enum dma_data_direction dir,
+		unsigned long attrs)
 {
 	return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset);
 }
 
-static int dma_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
-			     enum dma_data_direction dir,
-			     unsigned long attrs)
+static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
+		int nents, enum dma_data_direction dir, unsigned long attrs)
 {
 	int i;
 	struct scatterlist *sg;

@@ -58,12 +54,11 @@ static int dma_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nent
 	return nents;
 }
 
-const struct dma_map_ops dma_noop_ops = {
-	.alloc			= dma_noop_alloc,
-	.free			= dma_noop_free,
-	.map_page		= dma_noop_map_page,
-	.map_sg			= dma_noop_map_sg,
+const struct dma_map_ops dma_direct_ops = {
+	.alloc			= dma_direct_alloc,
+	.free			= dma_direct_free,
+	.map_page		= dma_direct_map_page,
+	.map_sg			= dma_direct_map_sg,
 	.is_phys		= true,
 };
-
-EXPORT_SYMBOL(dma_noop_ops);
+EXPORT_SYMBOL(dma_direct_ops);

-- 
2.14.2

[PATCH 26/67] dma-direct: use phys_to_dma

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:21

This means it uses whatever linear remapping scheme that the architecture
provides is used in the generic dma_direct ops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index 439db40854b7..0e087650e86b 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -1,12 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- *	lib/dma-noop.c
- *
- * DMA operations that map to physical addresses without flushing memory.
+ * DMA operations that map physical memory directly without using an IOMMU or
+ * flushing caches.
  */
 #include <linux/export.h>
 #include <linux/mm.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/scatterlist.h>
 #include <linux/pfn.h>

@@ -17,7 +16,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
 
 	ret = (void *)__get_free_pages(gfp, get_order(size));
 	if (ret)
-		*dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset);
+		*dma_handle = phys_to_dma(dev, virt_to_phys(ret));
 
 	return ret;
 }

@@ -32,7 +31,7 @@ static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
 		unsigned long offset, size_t size, enum dma_data_direction dir,
 		unsigned long attrs)
 {
-	return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset);
+	return phys_to_dma(dev, page_to_phys(page)) + offset;
 }
 
 static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,

@@ -42,12 +41,9 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	struct scatterlist *sg;
 
 	for_each_sg(sgl, sg, nents, i) {
-		dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset);
-		void *va;
-
 		BUG_ON(!sg_page(sg));
-		va = sg_virt(sg);
-		sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va) - offset;
+
+		sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg));
 		sg_dma_len(sg) = sg->length;
 	}

-- 
2.14.2

[PATCH 28/67] dma-direct: add support for CMA allocation

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:32

Try the CMA allocator for coherent allocations if supported.

Roughly modelled after the x86 code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index ddd9dcf4e663..d0266b39788b 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -7,6 +7,7 @@
 #include <linux/mm.h>
 #include <linux/dma-direct.h>
 #include <linux/scatterlist.h>
+#include <linux/dma-contiguous.h>
 #include <linux/pfn.h>
 
 #define DIRECT_MAPPING_ERROR		0

@@ -30,19 +31,30 @@ check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
 static void *dma_direct_alloc(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
-	void *ret;
+	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+	int page_order = get_order(size);
+	struct page *page = NULL;
 
-	ret = (void *)__get_free_pages(gfp, get_order(size));
-	if (ret)
-		*dma_handle = phys_to_dma(dev, virt_to_phys(ret));
+	/* CMA can be used only in the context which permits sleeping */
+	if (gfpflags_allow_blocking(gfp))
+		page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
+	if (!page)
+		page = alloc_pages(gfp, page_order);
+	if (!page)
+		return NULL;
 
-	return ret;
+	*dma_handle = phys_to_dma(dev, page_to_phys(page));
+	memset(page_address(page), 0, size);
+	return page_address(page);
 }
 
 static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
 		dma_addr_t dma_addr, unsigned long attrs)
 {
-	free_pages((unsigned long)cpu_addr, get_order(size));
+	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+
+	if (!dma_release_from_contiguous(dev, virt_to_page(cpu_addr), count))
+		free_pages((unsigned long)cpu_addr, get_order(size));
 }
 
 static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,

-- 
2.14.2

[PATCH 29/67] dma-direct: use node local allocations for coherent memory

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:39

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index d0266b39788b..ab81de3ac1d3 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -39,7 +39,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
 	if (gfpflags_allow_blocking(gfp))
 		page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
 	if (!page)
-		page = alloc_pages(gfp, page_order);
+		page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
 	if (!page)
 		return NULL;

-- 
2.14.2

[PATCH 30/67] dma-direct: retry allocations using GFP_DMA for small masks

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:45

If we got back an allocation that wasn't inside the support coherent mask,
retry the allocation using GFP_DMA.

Based on the x86 code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index ab81de3ac1d3..f8467cb3d89a 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -28,6 +28,11 @@ check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
 	return true;
 }
 
+static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
+{
+	return phys_to_dma(dev, phys) + size <= dev->coherent_dma_mask;
+}
+
 static void *dma_direct_alloc(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {

@@ -35,11 +40,29 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
 	int page_order = get_order(size);
 	struct page *page = NULL;
 
+again:
 	/* CMA can be used only in the context which permits sleeping */
-	if (gfpflags_allow_blocking(gfp))
+	if (gfpflags_allow_blocking(gfp)) {
 		page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
+		if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
+			dma_release_from_contiguous(dev, page, count);
+			page = NULL;
+		}
+	}
 	if (!page)
 		page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
+
+	if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
+		__free_pages(page, page_order);
+		page = NULL;
+
+		if (dev->coherent_dma_mask < DMA_BIT_MASK(32) &&
+		    !(gfp & GFP_DMA)) {
+			gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
+			goto again;
+		}
+	}
+
 	if (!page)
 		return NULL;

-- 
2.14.2

[PATCH 31/67] dma-direct: make dma_direct_{alloc,free} available to other implementations

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:49

So that they don't need to indirect through the operation vector.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/mm/dma-mapping-nommu.c | 9 +++------
 include/linux/dma-direct.h      | 5 +++++
 lib/dma-direct.c                | 6 +++---
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 49e9831dc0f1..b4cf3e4e9d4a 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c

@@ -11,7 +11,7 @@
 
 #include <linux/export.h>
 #include <linux/mm.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/scatterlist.h>
 
 #include <asm/cachetype.h>

@@ -39,7 +39,6 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size,
 				 unsigned long attrs)
 
 {
-	const struct dma_map_ops *ops = &dma_direct_ops;
 	void *ret;
 
 	/*

@@ -48,7 +47,7 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size,
 	 */
 
 	if (attrs & DMA_ATTR_NON_CONSISTENT)
-		return ops->alloc(dev, size, dma_handle, gfp, attrs);
+		return dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
 
 	ret = dma_alloc_from_global_coherent(size, dma_handle);

@@ -70,10 +69,8 @@ static void arm_nommu_dma_free(struct device *dev, size_t size,
 			       void *cpu_addr, dma_addr_t dma_addr,
 			       unsigned long attrs)
 {
-	const struct dma_map_ops *ops = &dma_direct_ops;
-
 	if (attrs & DMA_ATTR_NON_CONSISTENT) {
-		ops->free(dev, size, cpu_addr, dma_addr, attrs);
+		dma_direct_free(dev, size, cpu_addr, dma_addr, attrs);
 	} else {
 		int ret = dma_release_from_global_coherent(get_order(size),
 							   cpu_addr);

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 10e924b7cba7..4788bf0bf683 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h

@@ -38,4 +38,9 @@ static inline void dma_mark_clean(void *addr, size_t size)
 }
 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
 
+void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t gfp, unsigned long attrs);
+void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
+		dma_addr_t dma_addr, unsigned long attrs);
+
 #endif /* _LINUX_DMA_DIRECT_H */

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index f8467cb3d89a..7e913728e099 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -33,8 +33,8 @@ static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
 	return phys_to_dma(dev, phys) + size <= dev->coherent_dma_mask;
 }
 
-static void *dma_direct_alloc(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t gfp, unsigned long attrs)
 {
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	int page_order = get_order(size);

@@ -71,7 +71,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
 	return page_address(page);
 }
 
-static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
+void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
 		dma_addr_t dma_addr, unsigned long attrs)
 {
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;

-- 
2.14.2

[PATCH 32/67] dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:21:55

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index 7e913728e099..2e9b9494610c 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -12,6 +12,14 @@
 
 #define DIRECT_MAPPING_ERROR		0
 
+/*
+ * Most architectures use ZONE_DMA for the first 16 Megabytes, but
+ * some use it for entirely different regions:
+ */
+#ifndef ARCH_ZONE_DMA_BITS
+#define ARCH_ZONE_DMA_BITS 24
+#endif
+
 static bool
 check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
 		const char *caller)

@@ -40,6 +48,12 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	int page_order = get_order(size);
 	struct page *page = NULL;
 
+	/* GFP_DMA32 and GFP_DMA are no ops without the corresponding zones: */
+	if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
+		gfp |= GFP_DMA32;
+	else if (dev->coherent_dma_mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
+		gfp |= GFP_DMA;
+
 again:
 	/* CMA can be used only in the context which permits sleeping */
 	if (gfpflags_allow_blocking(gfp)) {

-- 
2.14.2

[PATCH 33/67] dma-direct: reject too small dma masks

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:03

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/dma-direct.h |  1 +
 lib/dma-direct.c           | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 4788bf0bf683..bcdb1a3e4b1f 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h

@@ -42,5 +42,6 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 		gfp_t gfp, unsigned long attrs);
 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
 		dma_addr_t dma_addr, unsigned long attrs);
+int dma_direct_supported(struct device *dev, u64 mask);
 
 #endif /* _LINUX_DMA_DIRECT_H */

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index 2e9b9494610c..5bb289483efc 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -123,6 +123,24 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 	return nents;
 }
 
+int dma_direct_supported(struct device *dev, u64 mask)
+{
+#ifdef CONFIG_ZONE_DMA
+	if (mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
+		return 0;
+#else
+	/*
+	 * Because 32-bit DMA masks are so common we expect every architecture
+	 * to be able to satisfy them - either by not supporting more physical
+	 * memory, or by providing a ZONE_DMA32.  If neither is the case, the
+	 * architecture needs to use an IOMMU instead of the direct mapping.
+	 */
+	if (mask < DMA_BIT_MASK(32))
+		return 0;
+#endif
+	return 1;
+}
+
 static int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 	return dma_addr == DIRECT_MAPPING_ERROR;

@@ -133,6 +151,7 @@ const struct dma_map_ops dma_direct_ops = {
 	.free			= dma_direct_free,
 	.map_page		= dma_direct_map_page,
 	.map_sg			= dma_direct_map_sg,
+	.dma_supported		= dma_direct_supported,
 	.mapping_error		= dma_direct_mapping_error,
 	.is_phys		= true,
 };

-- 
2.14.2

[PATCH 35/67] h8300: use dma-direct

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:13

Replace the bare-bones h8300 direct dma mapping implementation with
the fully featured generic dma-direct one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/h8300/Kconfig                   |  1 +
 arch/h8300/include/asm/Kbuild        |  1 +
 arch/h8300/include/asm/dma-mapping.h | 12 -------
 arch/h8300/kernel/Makefile           |  2 +-
 arch/h8300/kernel/dma.c              | 67 ------------------------------------
 5 files changed, 3 insertions(+), 80 deletions(-)
 delete mode 100644 arch/h8300/include/asm/dma-mapping.h
 delete mode 100644 arch/h8300/kernel/dma.c

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index f8d3fde08190..091d6d04b5e5 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig

@@ -23,6 +23,7 @@ config H8300
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_HASH
 	select CPU_NO_EFFICIENT_FFS
+	select DMA_DIRECT_OPS
 
 config CPU_BIG_ENDIAN
 	def_bool y

diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
index bc077491d299..642752c94306 100644
--- a/arch/h8300/include/asm/Kbuild
+++ b/arch/h8300/include/asm/Kbuild

@@ -9,6 +9,7 @@ generic-y += delay.h
 generic-y += device.h
 generic-y += div64.h
 generic-y += dma.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += exec.h
 generic-y += extable.h

diff --git a/arch/h8300/include/asm/dma-mapping.h b/arch/h8300/include/asm/dma-mapping.h
deleted file mode 100644
index 21bb1fc3a6f1..000000000000
--- a/arch/h8300/include/asm/dma-mapping.h
+++ /dev/null

@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _H8300_DMA_MAPPING_H
-#define _H8300_DMA_MAPPING_H
-
-extern const struct dma_map_ops h8300_dma_map_ops;
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	return &h8300_dma_map_ops;
-}
-
-#endif

diff --git a/arch/h8300/kernel/Makefile b/arch/h8300/kernel/Makefile
index b62e830525c6..307aa51576dd 100644
--- a/arch/h8300/kernel/Makefile
+++ b/arch/h8300/kernel/Makefile

@@ -7,7 +7,7 @@ extra-y := vmlinux.lds
 
 obj-y := process.o traps.o ptrace.o \
 	 signal.o setup.o syscalls.o \
-	 irq.o entry.o dma.o
+	 irq.o entry.o
 
 obj-$(CONFIG_ROMKERNEL) += head_rom.o
 obj-$(CONFIG_RAMKERNEL) += head_ram.o

diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c
deleted file mode 100644
index 4e27b74df973..000000000000
--- a/arch/h8300/kernel/dma.c
+++ /dev/null

@@ -1,67 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file COPYING in the main directory of this archive
- * for more details.
- */
-
-#include <linux/dma-mapping.h>
-#include <linux/kernel.h>
-#include <linux/scatterlist.h>
-#include <linux/module.h>
-#include <asm/pgalloc.h>
-
-static void *dma_alloc(struct device *dev, size_t size,
-		       dma_addr_t *dma_handle, gfp_t gfp,
-		       unsigned long attrs)
-{
-	void *ret;
-
-	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
-		gfp |= GFP_DMA;
-	ret = (void *)__get_free_pages(gfp, get_order(size));
-
-	if (ret != NULL) {
-		memset(ret, 0, size);
-		*dma_handle = virt_to_phys(ret);
-	}
-	return ret;
-}
-
-static void dma_free(struct device *dev, size_t size,
-		     void *vaddr, dma_addr_t dma_handle,
-		     unsigned long attrs)
-
-{
-	free_pages((unsigned long)vaddr, get_order(size));
-}
-
-static dma_addr_t map_page(struct device *dev, struct page *page,
-				  unsigned long offset, size_t size,
-				  enum dma_data_direction direction,
-				  unsigned long attrs)
-{
-	return page_to_phys(page) + offset;
-}
-
-static int map_sg(struct device *dev, struct scatterlist *sgl,
-		  int nents, enum dma_data_direction direction,
-		  unsigned long attrs)
-{
-	struct scatterlist *sg;
-	int i;
-
-	for_each_sg(sgl, sg, nents, i) {
-		sg->dma_address = sg_phys(sg);
-	}
-
-	return nents;
-}
-
-const struct dma_map_ops h8300_dma_map_ops = {
-	.alloc = dma_alloc,
-	.free = dma_free,
-	.map_page = map_page,
-	.map_sg = map_sg,
-	.is_phys = true,
-};
-EXPORT_SYMBOL(h8300_dma_map_ops);

-- 
2.14.2

[PATCH 36/67] x86: remove dma_alloc_coherent_mask

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:16

These days all devices (including the ISA fallback device) have a coherent
DMA mask set, so remove the workaround.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/dma-mapping.h | 18 ++----------------
 arch/x86/kernel/pci-dma.c          | 10 ++++------
 arch/x86/mm/mem_encrypt.c          |  4 +---
 drivers/xen/swiotlb-xen.c          | 16 +---------------
 4 files changed, 8 insertions(+), 40 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 6277c83c0eb1..545bf3721bc0 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h

@@ -44,26 +44,12 @@ extern void dma_generic_free_coherent(struct device *dev, size_t size,
 				      void *vaddr, dma_addr_t dma_addr,
 				      unsigned long attrs);
 
-static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
-						    gfp_t gfp)
-{
-	unsigned long dma_mask = 0;
-
-	dma_mask = dev->coherent_dma_mask;
-	if (!dma_mask)
-		dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
-
-	return dma_mask;
-}
-
 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 {
-	unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
-
-	if (dma_mask <= DMA_BIT_MASK(24))
+	if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))
 		gfp |= GFP_DMA;
 #ifdef CONFIG_X86_64
-	if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
+	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
 		gfp |= GFP_DMA32;
 #endif
        return gfp;

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index df7ab02f959f..b59820872ec7 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -80,13 +80,10 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 				 dma_addr_t *dma_addr, gfp_t flag,
 				 unsigned long attrs)
 {
-	unsigned long dma_mask;
 	struct page *page;
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	dma_addr_t addr;
 
-	dma_mask = dma_alloc_coherent_mask(dev, flag);
-
 again:
 	page = NULL;
 	/* CMA can be used only in the context which permits sleeping */

@@ -95,7 +92,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 						 flag);
 		if (page) {
 			addr = phys_to_dma(dev, page_to_phys(page));
-			if (addr + size > dma_mask) {
+			if (addr + size > dev->coherent_dma_mask) {
 				dma_release_from_contiguous(dev, page, count);
 				page = NULL;
 			}

@@ -108,10 +105,11 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 		return NULL;
 
 	addr = phys_to_dma(dev, page_to_phys(page));
-	if (addr + size > dma_mask) {
+	if (addr + size > dev->coherent_dma_mask) {
 		__free_pages(page, get_order(size));
 
-		if (dma_mask < DMA_BIT_MASK(32) && !(flag & GFP_DMA)) {
+		if (dev->coherent_dma_mask < DMA_BIT_MASK(32) &&
+		    !(flag & GFP_DMA)) {
 			flag = (flag & ~GFP_DMA32) | GFP_DMA;
 			goto again;
 		}

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 764b916ef7da..479586b8ca9b 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c

@@ -203,12 +203,10 @@ void __init sme_early_init(void)
 static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 		       gfp_t gfp, unsigned long attrs)
 {
-	unsigned long dma_mask;
 	unsigned int order;
 	struct page *page;
 	void *vaddr = NULL;
 
-	dma_mask = dma_alloc_coherent_mask(dev, gfp);
 	order = get_order(size);
 
 	/*

@@ -226,7 +224,7 @@ static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 		 * mask with it already cleared.
 		 */
 		addr = __sme_clr(phys_to_dma(dev, page_to_phys(page)));
-		if ((addr + size) > dma_mask) {
+		if ((addr + size) > dev->coherent_dma_mask) {
 			__free_pages(page, get_order(size));
 		} else {
 			vaddr = page_address(page);

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 5bb72d3f8337..e1c60899fdbc 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c

@@ -53,20 +53,6 @@
  * API.
  */
 
-#ifndef CONFIG_X86
-static unsigned long dma_alloc_coherent_mask(struct device *dev,
-					    gfp_t gfp)
-{
-	unsigned long dma_mask = 0;
-
-	dma_mask = dev->coherent_dma_mask;
-	if (!dma_mask)
-		dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
-
-	return dma_mask;
-}
-#endif
-
 #define XEN_SWIOTLB_ERROR_CODE	(~(dma_addr_t)0x0)
 
 static char *xen_io_tlb_start, *xen_io_tlb_end;

@@ -328,7 +314,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		return ret;
 
 	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = dma_alloc_coherent_mask(hwdev, flags);
+		dma_mask = hwdev->coherent_dma_mask;
 
 	/* At this point dma_handle is the physical address, next we are
 	 * going to set it to the machine address.

-- 
2.14.2

[PATCH 38/67] x86/amd_gart: clean up gart_alloc_coherent

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:27

Don't rely on the gfp mask from dma_alloc_coherent_gfp_flags to make the
fallback decision, and streamline the code flow a bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/kernel/amd_gart_64.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 52e3abcf3e70..92054815023e 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c

@@ -484,26 +484,26 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
 	unsigned long align_mask;
 	struct page *page;
 
-	if (force_iommu && !(flag & GFP_DMA)) {
-		flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
-		page = alloc_pages(flag | __GFP_ZERO, get_order(size));
-		if (!page)
-			return NULL;
-
-		align_mask = (1UL << get_order(size)) - 1;
-		paddr = dma_map_area(dev, page_to_phys(page), size,
-				     DMA_BIDIRECTIONAL, align_mask);
-
-		flush_gart();
-		if (paddr != bad_dma_addr) {
-			*dma_addr = paddr;
-			return page_address(page);
-		}
-		__free_pages(page, get_order(size));
-	} else
+	if (!force_iommu || dev->coherent_dma_mask <= DMA_BIT_MASK(24))
 		return dma_direct_alloc(dev, size, dma_addr, flag, attrs);
 
-	return NULL;
+	flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+	page = alloc_pages(flag | __GFP_ZERO, get_order(size));
+	if (!page)
+		return NULL;
+
+	align_mask = (1UL << get_order(size)) - 1;
+	paddr = dma_map_area(dev, page_to_phys(page), size, DMA_BIDIRECTIONAL,
+			align_mask);
+
+	flush_gart();
+	if (unlikely(paddr == bad_dma_addr)) {
+		__free_pages(page, get_order(size));
+		return NULL;
+	}
+
+	*dma_addr = paddr;
+	return page_address(page);
 }
 
 /* free a coherent mapping */

-- 
2.14.2

[PATCH 39/67] iommu/amd_iommu: use dma_direct_* helpers for the direct mapping case

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:30

This adds support for CMA allocations, but is otherwise identical.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/iommu/Kconfig     |  1 +
 drivers/iommu/amd_iommu.c | 27 +++++++++------------------
 2 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f3a21343e636..dc7c1914645d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig

@@ -107,6 +107,7 @@ config IOMMU_PGTABLES_L2
 # AMD IOMMU support
 config AMD_IOMMU
 	bool "AMD IOMMU support"
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 	select PCI_MSI
 	select PCI_ATS

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index ea4734de5357..a2ad149ab0bf 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c

@@ -2592,11 +2592,9 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	struct page *page;
 
 	domain = get_domain(dev);
-	if (PTR_ERR(domain) == -EINVAL) {
-		page = alloc_pages(flag, get_order(size));
-		*dma_addr = page_to_phys(page);
-		return page_address(page);
-	} else if (IS_ERR(domain))
+	if (PTR_ERR(domain) == -EINVAL)
+		return dma_direct_alloc(dev, size, dma_addr, flag, attrs);
+	else if (IS_ERR(domain))
 		return NULL;
 
 	dma_dom   = to_dma_ops_domain(domain);

@@ -2642,24 +2640,17 @@ static void free_coherent(struct device *dev, size_t size,
 			  void *virt_addr, dma_addr_t dma_addr,
 			  unsigned long attrs)
 {
-	struct protection_domain *domain;
-	struct dma_ops_domain *dma_dom;
-	struct page *page;
+	struct protection_domain *domain = get_domain(dev);
 
-	page = virt_to_page(virt_addr);
 	size = PAGE_ALIGN(size);
 
-	domain = get_domain(dev);
-	if (IS_ERR(domain))
-		goto free_mem;
-
-	dma_dom = to_dma_ops_domain(domain);
+	if (!IS_ERR(domain)) {
+		struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
 
-	__unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
+		__unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
+	}
 
-free_mem:
-	if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
-		__free_pages(page, get_order(size));
+	dma_direct_free(dev, size, virt_addr, dma_addr, attrs);
 }
 
 /*

-- 
2.14.2

[PATCH 42/67] arm64: rename swiotlb_dma_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:40

We'll need that name for a generic implementation soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm64/mm/dma-mapping.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index f3a637b98487..6840426bbe77 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c

@@ -368,7 +368,7 @@ static int __swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t addr)
 	return 0;
 }
 
-static const struct dma_map_ops swiotlb_dma_ops = {
+static const struct dma_map_ops arm64_swiotlb_dma_ops = {
 	.alloc = __dma_alloc,
 	.free = __dma_free,
 	.mmap = __swiotlb_mmap,

@@ -923,7 +923,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 			const struct iommu_ops *iommu, bool coherent)
 {
 	if (!dev->dma_ops)
-		dev->dma_ops = &swiotlb_dma_ops;
+		dev->dma_ops = &arm64_swiotlb_dma_ops;
 
 	dev->archdata.dma_coherent = coherent;
 	__iommu_setup_dma_ops(dev, dma_base, size, iommu);

-- 
2.14.2

[PATCH 44/67] powerpc: rename swiotlb_dma_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:48

We'll need that name for a generic implementation soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/powerpc/include/asm/swiotlb.h | 2 +-
 arch/powerpc/kernel/dma-swiotlb.c  | 4 ++--
 arch/powerpc/kernel/dma.c          | 2 +-
 arch/powerpc/sysdev/fsl_pci.c      | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/swiotlb.h b/arch/powerpc/include/asm/swiotlb.h
index 9341ee804d19..f65ecf57b66c 100644
--- a/arch/powerpc/include/asm/swiotlb.h
+++ b/arch/powerpc/include/asm/swiotlb.h

@@ -13,7 +13,7 @@
 
 #include <linux/swiotlb.h>
 
-extern const struct dma_map_ops swiotlb_dma_ops;
+extern const struct dma_map_ops powerpc_swiotlb_dma_ops;
 
 extern unsigned int ppc_swiotlb_enable;
 int __init swiotlb_setup_bus_notifier(void);

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index f1e99b9cee97..506ac4fafac5 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c

@@ -46,7 +46,7 @@ static u64 swiotlb_powerpc_get_required(struct device *dev)
  * map_page, and unmap_page on highmem, use normal dma_ops
  * for everything else.
  */
-const struct dma_map_ops swiotlb_dma_ops = {
+const struct dma_map_ops powerpc_swiotlb_dma_ops = {
 	.alloc = __dma_nommu_alloc_coherent,
 	.free = __dma_nommu_free_coherent,
 	.mmap = dma_nommu_mmap_coherent,

@@ -89,7 +89,7 @@ static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
 
 	/* May need to bounce if the device can't address all of DRAM */
 	if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
-		set_dma_ops(dev, &swiotlb_dma_ops);
+		set_dma_ops(dev, &powerpc_swiotlb_dma_ops);
 
 	return NOTIFY_DONE;
 }

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 1723001d5de1..b787692b91ee 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c

@@ -33,7 +33,7 @@ static u64 __maybe_unused get_pfn_limit(struct device *dev)
 	struct dev_archdata __maybe_unused *sd = &dev->archdata;
 
 #ifdef CONFIG_SWIOTLB
-	if (sd->max_direct_dma_addr && dev->dma_ops == &swiotlb_dma_ops)
+	if (sd->max_direct_dma_addr && dev->dma_ops == &powerpc_swiotlb_dma_ops)
 		pfn = min_t(u64, pfn, sd->max_direct_dma_addr >> PAGE_SHIFT);
 #endif

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index e4d0133bbeeb..61e07c78d64f 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c

@@ -118,7 +118,7 @@ static void setup_swiotlb_ops(struct pci_controller *hose)
 {
 	if (ppc_swiotlb_enable) {
 		hose->controller_ops.dma_dev_setup = pci_dma_dev_setup_swiotlb;
-		set_pci_dma_ops(&swiotlb_dma_ops);
+		set_pci_dma_ops(&powerpc_swiotlb_dma_ops);
 	}
 }
 #else

-- 
2.14.2

[PATCH 43/67] ia64: rename swiotlb_dma_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:51

We'll need that name for a generic implementation soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/ia64/hp/common/hwsw_iommu.c | 4 ++--
 arch/ia64/hp/common/sba_iommu.c  | 6 +++---
 arch/ia64/kernel/pci-swiotlb.c   | 6 +++---
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/ia64/hp/common/hwsw_iommu.c b/arch/ia64/hp/common/hwsw_iommu.c
index 63d8e1d2477f..41279f0442bd 100644
--- a/arch/ia64/hp/common/hwsw_iommu.c
+++ b/arch/ia64/hp/common/hwsw_iommu.c

@@ -19,7 +19,7 @@
 #include <linux/export.h>
 #include <asm/machvec.h>
 
-extern const struct dma_map_ops sba_dma_ops, swiotlb_dma_ops;
+extern const struct dma_map_ops sba_dma_ops, ia64_swiotlb_dma_ops;
 
 /* swiotlb declarations & definitions: */
 extern int swiotlb_late_init_with_default_size (size_t size);

@@ -38,7 +38,7 @@ static inline int use_swiotlb(struct device *dev)
 const struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
 {
 	if (use_swiotlb(dev))
-		return &swiotlb_dma_ops;
+		return &ia64_swiotlb_dma_ops;
 	return &sba_dma_ops;
 }
 EXPORT_SYMBOL(hwsw_dma_get_ops);

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 6f05aba9012f..d68849ad2ee1 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c

@@ -2093,7 +2093,7 @@ static int __init acpi_sba_ioc_init_acpi(void)
 /* This has to run before acpi_scan_init(). */
 arch_initcall(acpi_sba_ioc_init_acpi);
 
-extern const struct dma_map_ops swiotlb_dma_ops;
+extern const struct dma_map_ops ia64_swiotlb_dma_ops;
 
 static int __init
 sba_init(void)

@@ -2108,7 +2108,7 @@ sba_init(void)
 	 * a successful kdump kernel boot is to use the swiotlb.
 	 */
 	if (is_kdump_kernel()) {
-		dma_ops = &swiotlb_dma_ops;
+		dma_ops = &ia64_swiotlb_dma_ops;
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to initialize software I/O TLB:"
 				  " Try machvec=dig boot option");

@@ -2130,7 +2130,7 @@ sba_init(void)
 		 * If we didn't find something sba_iommu can claim, we
 		 * need to setup the swiotlb and switch to the dig machvec.
 		 */
-		dma_ops = &swiotlb_dma_ops;
+		dma_ops = &ia64_swiotlb_dma_ops;
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to find SBA IOMMU or initialize "
 			      "software I/O TLB: Try machvec=dig boot option");

diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
index 5e50939aa03e..f1ae873a8c35 100644
--- a/arch/ia64/kernel/pci-swiotlb.c
+++ b/arch/ia64/kernel/pci-swiotlb.c

@@ -31,7 +31,7 @@ static void ia64_swiotlb_free_coherent(struct device *dev, size_t size,
 	swiotlb_free_coherent(dev, size, vaddr, dma_addr);
 }
 
-const struct dma_map_ops swiotlb_dma_ops = {
+const struct dma_map_ops ia64_swiotlb_dma_ops = {
 	.alloc = ia64_swiotlb_alloc_coherent,
 	.free = ia64_swiotlb_free_coherent,
 	.map_page = swiotlb_map_page,

@@ -48,7 +48,7 @@ const struct dma_map_ops swiotlb_dma_ops = {
 
 void __init swiotlb_dma_init(void)
 {
-	dma_ops = &swiotlb_dma_ops;
+	dma_ops = &ia64_swiotlb_dma_ops;
 	swiotlb_init(1);
 }

@@ -60,7 +60,7 @@ void __init pci_swiotlb_init(void)
 		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
 		machvec_init("dig");
 		swiotlb_init(1);
-		dma_ops = &swiotlb_dma_ops;
+		dma_ops = &ia64_swiotlb_dma_ops;
 #else
 		panic("Unable to find Intel IOMMU");
 #endif

-- 
2.14.2

[PATCH 46/67] swiotlb: lift x86 swiotlb_dma_ops to common code

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:22:56

Including the useful helpers for coherent allocations that first try the
full blown direct mapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/swiotlb.h |  8 --------
 arch/x86/kernel/pci-swiotlb.c  | 45 ------------------------------------------
 arch/x86/pci/sta2x11-fixup.c   |  4 ++--
 include/linux/swiotlb.h        |  8 ++++++++
 lib/swiotlb.c                  | 43 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 53 insertions(+), 55 deletions(-)

diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
index 1c6a6cb230ff..ff6c92eff035 100644
--- a/arch/x86/include/asm/swiotlb.h
+++ b/arch/x86/include/asm/swiotlb.h

@@ -27,12 +27,4 @@ static inline void pci_swiotlb_late_init(void)
 {
 }
 #endif
-
-extern void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-					dma_addr_t *dma_handle, gfp_t flags,
-					unsigned long attrs);
-extern void x86_swiotlb_free_coherent(struct device *dev, size_t size,
-					void *vaddr, dma_addr_t dma_addr,
-					unsigned long attrs);
-
 #endif /* _ASM_X86_SWIOTLB_H */

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 57dea60c2473..661583662430 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c

@@ -17,51 +17,6 @@
 
 int swiotlb __read_mostly;
 
-void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-					dma_addr_t *dma_handle, gfp_t flags,
-					unsigned long attrs)
-{
-	void *vaddr;
-
-	/*
-	 * Don't print a warning when the first allocation attempt fails.
-	 * swiotlb_alloc_coherent() will print a warning when the DMA
-	 * memory allocation ultimately failed.
-	 */
-	flags |= __GFP_NOWARN;
-
-	vaddr = dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
-	if (vaddr)
-		return vaddr;
-
-	return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
-}
-
-void x86_swiotlb_free_coherent(struct device *dev, size_t size,
-				      void *vaddr, dma_addr_t dma_addr,
-				      unsigned long attrs)
-{
-	if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr)))
-		swiotlb_free_coherent(dev, size, vaddr, dma_addr);
-	else
-		dma_direct_free(dev, size, vaddr, dma_addr, attrs);
-}
-
-static const struct dma_map_ops swiotlb_dma_ops = {
-	.mapping_error = swiotlb_dma_mapping_error,
-	.alloc = x86_swiotlb_alloc_coherent,
-	.free = x86_swiotlb_free_coherent,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.dma_supported = NULL,
-};
-
 /*
  * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
  *

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 6c712fe11bdc..4b69b008d5aa 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c

@@ -175,7 +175,7 @@ static void *sta2x11_swiotlb_alloc_coherent(struct device *dev,
 {
 	void *vaddr;
 
-	vaddr = x86_swiotlb_alloc_coherent(dev, size, dma_handle, flags, attrs);
+	vaddr = swiotlb_alloc(dev, size, dma_handle, flags, attrs);
 	*dma_handle = p2a(*dma_handle, to_pci_dev(dev));
 	return vaddr;
 }

@@ -183,7 +183,7 @@ static void *sta2x11_swiotlb_alloc_coherent(struct device *dev,
 /* We have our own dma_ops: the same as swiotlb but from alloc (above) */
 static const struct dma_map_ops sta2x11_dma_ops = {
 	.alloc = sta2x11_swiotlb_alloc_coherent,
-	.free = x86_swiotlb_free_coherent,
+	.free = swiotlb_free,
 	.map_page = swiotlb_map_page,
 	.unmap_page = swiotlb_unmap_page,
 	.map_sg = swiotlb_map_sg_attrs,

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 606375e35d87..5b1f2a00491c 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h

@@ -66,6 +66,12 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev,
 				    enum dma_sync_target target);
 
 /* Accessory functions. */
+
+void *swiotlb_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
+		gfp_t flags, unsigned long attrs);
+void swiotlb_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_addr, unsigned long attrs);
+
 extern void
 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 			dma_addr_t *dma_handle, gfp_t flags);

@@ -126,4 +132,6 @@ extern void swiotlb_print_info(void);
 extern int is_swiotlb_buffer(phys_addr_t paddr);
 extern void swiotlb_set_max_segment(unsigned int);
 
+extern const struct dma_map_ops swiotlb_dma_ops;
+
 #endif /* __LINUX_SWIOTLB_H */

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c1fcd3a32d07..9c100f0173bf 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -1084,3 +1084,46 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
 	return swiotlb_phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
 EXPORT_SYMBOL(swiotlb_dma_supported);
+
+#ifdef CONFIG_DMA_DIRECT_OPS
+void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t gfp, unsigned long attrs)
+{
+	void *vaddr;
+
+	/*
+	 * Don't print a warning when the first allocation attempt fails.
+	 * swiotlb_alloc_coherent() will print a warning when the DMA memory
+	 * allocation ultimately failed.
+	 */
+	gfp |= __GFP_NOWARN;
+
+	vaddr = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
+	if (!vaddr)
+		vaddr = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+	return vaddr;
+}
+
+void swiotlb_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_addr, unsigned long attrs)
+{
+	if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr)))
+		swiotlb_free_coherent(dev, size, vaddr, dma_addr);
+	else
+		dma_direct_free(dev, size, vaddr, dma_addr, attrs);
+}
+
+const struct dma_map_ops swiotlb_dma_ops = {
+	.mapping_error		= swiotlb_dma_mapping_error,
+	.alloc			= swiotlb_alloc,
+	.free			= swiotlb_free,
+	.sync_single_for_cpu	= swiotlb_sync_single_for_cpu,
+	.sync_single_for_device	= swiotlb_sync_single_for_device,
+	.sync_sg_for_cpu	= swiotlb_sync_sg_for_cpu,
+	.sync_sg_for_device	= swiotlb_sync_sg_for_device,
+	.map_sg			= swiotlb_map_sg_attrs,
+	.unmap_sg		= swiotlb_unmap_sg_attrs,
+	.map_page		= swiotlb_map_page,
+	.unmap_page		= swiotlb_unmap_page,
+};
+#endif /* CONFIG_DMA_DIRECT_OPS */

-- 
2.14.2

[PATCH 47/67] swiotlb: wire up ->dma_supported in swiotlb_dma_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:05

To properly reject too small DMA masks based on the addressability of the
bounce buffer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 9c100f0173bf..e0b8980334c3 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -1125,5 +1125,6 @@ const struct dma_map_ops swiotlb_dma_ops = {
 	.unmap_sg		= swiotlb_unmap_sg_attrs,
 	.map_page		= swiotlb_map_page,
 	.unmap_page		= swiotlb_unmap_page,
+	.dma_supported		= swiotlb_dma_supported,
 };
 #endif /* CONFIG_DMA_DIRECT_OPS */

-- 
2.14.2

[PATCH 50/67] swiotlb: refactor coherent buffer allocation

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:18

Factor out a new swiotlb_alloc_buffer helper that allocates DMA coherent
memory from the swiotlb bounce buffer.

This allows to simplify the swiotlb_alloc implemenation that uses
dma_direct_alloc to try to allocate a reachable buffer first.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 100 ++++++++++++++++++++++++++++++----------------------------
 1 file changed, 51 insertions(+), 49 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index adb4dd0091fa..905eea6353a3 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -709,67 +709,69 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 }
 EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single);
 
+static void *
+swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle)
+{
+	phys_addr_t phys_addr;
+
+	if (swiotlb_force == SWIOTLB_NO_FORCE)
+		goto out_warn;
+
+	phys_addr = swiotlb_tbl_map_single(dev,
+			swiotlb_phys_to_dma(dev, io_tlb_start),
+			0, size, DMA_FROM_DEVICE, 0);
+	if (phys_addr == SWIOTLB_MAP_ERROR)
+		goto out_warn;
+
+	*dma_handle = swiotlb_phys_to_dma(dev, phys_addr);
+
+	/* Confirm address can be DMA'd by device */
+	if (*dma_handle + size - 1 > dev->coherent_dma_mask)
+		goto out_unmap;
+
+	memset(phys_to_virt(phys_addr), 0, size);
+	return phys_to_virt(phys_addr);
+
+out_unmap:
+	dev_warn(dev, "hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
+		(unsigned long long)dev->coherent_dma_mask,
+		(unsigned long long)*dma_handle);
+
+	/*
+	 * DMA_TO_DEVICE to avoid memcpy in unmap_single.
+	 * DMA_ATTR_SKIP_CPU_SYNC is optional.
+	 */
+	swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
+			DMA_ATTR_SKIP_CPU_SYNC);
+out_warn:
+	dev_warn(dev,
+		"swiotlb: coherent allocation failed, size=%zu\n", size);
+	dump_stack();
+	return NULL;
+}
+
 void *
 swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		       dma_addr_t *dma_handle, gfp_t flags)
 {
-	dma_addr_t dev_addr;
-	void *ret;
 	int order = get_order(size);
+	void *ret;
 
 	ret = (void *)__get_free_pages(flags, order);
 	if (ret) {
-		dev_addr = swiotlb_virt_to_bus(hwdev, ret);
-		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
-			/*
-			 * The allocated memory isn't reachable by the device.
-			 */
-			free_pages((unsigned long) ret, order);
-			ret = NULL;
+		*dma_handle = swiotlb_virt_to_bus(hwdev, ret);
+		if (*dma_handle  + size - 1 <= hwdev->coherent_dma_mask) {
+			memset(ret, 0, size);
+			return ret;
 		}
-	}
-	if (!ret) {
+
 		/*
-		 * We are either out of memory or the device can't DMA to
-		 * GFP_DMA memory; fall back on map_single(), which
-		 * will grab memory from the lowest available address range.
+		 * The allocated memory isn't reachable by the device.
 		 */
-		phys_addr_t paddr = map_single(hwdev, 0, size,
-					       DMA_FROM_DEVICE, 0);
-		if (paddr == SWIOTLB_MAP_ERROR)
-			goto err_warn;
-
-		ret = phys_to_virt(paddr);
-		dev_addr = swiotlb_phys_to_dma(hwdev, paddr);
-
-		/* Confirm address can be DMA'd by device */
-		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
-			printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
-			       (unsigned long long)hwdev->coherent_dma_mask,
-			       (unsigned long long)dev_addr);
-
-			/*
-			 * DMA_TO_DEVICE to avoid memcpy in unmap_single.
-			 * The DMA_ATTR_SKIP_CPU_SYNC is optional.
-			 */
-			swiotlb_tbl_unmap_single(hwdev, paddr,
-						 size, DMA_TO_DEVICE,
-						 DMA_ATTR_SKIP_CPU_SYNC);
-			goto err_warn;
-		}
+		free_pages((unsigned long) ret, order);
 	}
 
-	*dma_handle = dev_addr;
-	memset(ret, 0, size);
-
-	return ret;
-
-err_warn:
-	pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n",
-		dev_name(hwdev), size);
-	dump_stack();
-
-	return NULL;
+	return swiotlb_alloc_buffer(hwdev, size, dma_handle);
 }
 EXPORT_SYMBOL(swiotlb_alloc_coherent);

@@ -1105,7 +1107,7 @@ void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 
 	vaddr = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
 	if (!vaddr)
-		vaddr = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+		vaddr = swiotlb_alloc_buffer(dev, size, dma_handle);
 	return vaddr;
 }

-- 
2.14.2

[PATCH 52/67] dma-direct: handle the memory encryption bit in common code

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:28

Gіve the basic phys_to_dma and dma_to_phys helpers a __-prefix and add
the memory encryption mask to the non-prefixed versions.  Use the
__-prefixed versions directly instead of clearing the mask again in
various places.

With that in place the generic dma-direct routines can be used to
allocate non-encrypted bounce buffers, and the x86 SEV case can use
the generic swiotlb ops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm/include/asm/dma-direct.h                  |  4 +-
 arch/mips/cavium-octeon/dma-octeon.c               | 10 +--
 .../include/asm/mach-cavium-octeon/dma-coherence.h |  4 +-
 .../include/asm/mach-loongson64/dma-coherence.h    | 10 +--
 arch/mips/loongson64/common/dma-swiotlb.c          |  4 +-
 arch/powerpc/include/asm/dma-direct.h              |  4 +-
 arch/x86/Kconfig                                   |  2 +-
 arch/x86/include/asm/dma-direct.h                  | 25 +-------
 arch/x86/mm/mem_encrypt.c                          | 73 +---------------------
 arch/x86/pci/sta2x11-fixup.c                       |  6 +-
 include/linux/dma-direct.h                         | 23 ++++++-
 lib/dma-direct.c                                   | 24 +++++--
 lib/swiotlb.c                                      | 25 +++-----
 13 files changed, 76 insertions(+), 138 deletions(-)

diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
index 5b0a8a421894..b67e5fc1fe43 100644
--- a/arch/arm/include/asm/dma-direct.h
+++ b/arch/arm/include/asm/dma-direct.h

@@ -2,13 +2,13 @@
 #ifndef ASM_ARM_DMA_DIRECT_H
 #define ASM_ARM_DMA_DIRECT_H 1
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	unsigned int offset = paddr & ~PAGE_MASK;
 	return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
 }
 
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 {
 	unsigned int offset = dev_addr & ~PAGE_MASK;
 	return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index 5baf79fce643..6440ad3f9e3b 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c

@@ -10,7 +10,7 @@
  * IP32 changes by Ilya.
  * Copyright (C) 2010 Cavium Networks, Inc.
  */
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/scatterlist.h>
 #include <linux/bootmem.h>
 #include <linux/export.h>

@@ -202,7 +202,7 @@ struct octeon_dma_map_ops {
 	phys_addr_t (*dma_to_phys)(struct device *dev, dma_addr_t daddr);
 };
 
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
 						      struct octeon_dma_map_ops,

@@ -210,9 +210,9 @@ dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 
 	return ops->phys_to_dma(dev, paddr);
 }
-EXPORT_SYMBOL(phys_to_dma);
+EXPORT_SYMBOL(__phys_to_dma);
 
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
 	struct octeon_dma_map_ops *ops = container_of(get_dma_ops(dev),
 						      struct octeon_dma_map_ops,

@@ -220,7 +220,7 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 
 	return ops->dma_to_phys(dev, daddr);
 }
-EXPORT_SYMBOL(dma_to_phys);
+EXPORT_SYMBOL(__dma_to_phys);
 
 static struct octeon_dma_map_ops octeon_linear_dma_map_ops = {
 	.dma_map_ops = {

diff --git a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
index f00833acb626..6f8e024f4f97 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/dma-coherence.h

@@ -69,8 +69,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 	return addr + size <= *dev->dma_mask;
 }
 
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr);
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr);
 
 struct dma_map_ops;
 extern const struct dma_map_ops *octeon_pci_dma_map_ops;

diff --git a/arch/mips/include/asm/mach-loongson64/dma-coherence.h b/arch/mips/include/asm/mach-loongson64/dma-coherence.h
index 5cfda8f893e9..94fd224dddee 100644
--- a/arch/mips/include/asm/mach-loongson64/dma-coherence.h
+++ b/arch/mips/include/asm/mach-loongson64/dma-coherence.h

@@ -25,13 +25,13 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 	return addr + size <= *dev->dma_mask;
 }
 
-extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
+extern dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr);
+extern phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr);
 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
 					  size_t size)
 {
 #ifdef CONFIG_CPU_LOONGSON3
-	return phys_to_dma(dev, virt_to_phys(addr));
+	return __phys_to_dma(dev, virt_to_phys(addr));
 #else
 	return virt_to_phys(addr) | 0x80000000;
 #endif

@@ -41,7 +41,7 @@ static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
 					       struct page *page)
 {
 #ifdef CONFIG_CPU_LOONGSON3
-	return phys_to_dma(dev, page_to_phys(page));
+	return __phys_to_dma(dev, page_to_phys(page));
 #else
 	return page_to_phys(page) | 0x80000000;
 #endif

@@ -51,7 +51,7 @@ static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
 	dma_addr_t dma_addr)
 {
 #if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
-	return dma_to_phys(dev, dma_addr);
+	return __dma_to_phys(dev, dma_addr);
 #elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
 	return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
 #else

diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c
index 15388c24a504..0a02ea70e39f 100644
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/common/dma-swiotlb.c

@@ -80,7 +80,7 @@ static int loongson_dma_supported(struct device *dev, u64 mask)
 	return swiotlb_dma_supported(dev, mask);
 }
 
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	long nid;
 #ifdef CONFIG_PHYS48_TO_HT40

@@ -92,7 +92,7 @@ dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 	return paddr;
 }
 
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
 	long nid;
 #ifdef CONFIG_PHYS48_TO_HT40

diff --git a/arch/powerpc/include/asm/dma-direct.h b/arch/powerpc/include/asm/dma-direct.h
index a5b59c765426..7702875aabb7 100644
--- a/arch/powerpc/include/asm/dma-direct.h
+++ b/arch/powerpc/include/asm/dma-direct.h

@@ -17,12 +17,12 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 	return addr + size - 1 <= *dev->dma_mask;
 }
 
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	return paddr + get_dma_offset(dev);
 }
 
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
 	return daddr - get_dma_offset(dev);
 }

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 55ad01515075..3f2076aba40e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig

@@ -54,7 +54,6 @@ config X86
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_KCOV			if X86_64
-	select ARCH_HAS_PHYS_TO_DMA
 	select ARCH_HAS_PMEM_API		if X86_64
 	# Causing hangs/crashes, see the commit that added this change for details.
 	select ARCH_HAS_REFCOUNT

@@ -675,6 +674,7 @@ config X86_SUPPORTS_MEMORY_FAILURE
 config STA2X11
 	bool "STA2X11 Companion Chip Support"
 	depends on X86_32_NON_STANDARD && PCI
+	select ARCH_HAS_PHYS_TO_DMA
 	select X86_DEV_DMA_OPS
 	select X86_DMA_REMAP
 	select SWIOTLB

diff --git a/arch/x86/include/asm/dma-direct.h b/arch/x86/include/asm/dma-direct.h
index 1295bc622ebe..1a19251eaac9 100644
--- a/arch/x86/include/asm/dma-direct.h
+++ b/arch/x86/include/asm/dma-direct.h

@@ -2,29 +2,8 @@
 #ifndef ASM_X86_DMA_DIRECT_H
 #define ASM_X86_DMA_DIRECT_H 1
 
-#include <linux/mem_encrypt.h>
-
-#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
 bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
-#else
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return 0;
-
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
-{
-	return __sme_set(paddr);
-}
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr);
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr);
 
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
-{
-	return __sme_clr(daddr);
-}
-#endif /* CONFIG_X86_DMA_REMAP */
 #endif /* ASM_X86_DMA_DIRECT_H */

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 1c786e751b49..93de36cc3dd9 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c

@@ -200,58 +200,6 @@ void __init sme_early_init(void)
 		swiotlb_force = SWIOTLB_FORCE;
 }
 
-static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		       gfp_t gfp, unsigned long attrs)
-{
-	unsigned int order;
-	struct page *page;
-	void *vaddr = NULL;
-
-	order = get_order(size);
-	page = alloc_pages_node(dev_to_node(dev), gfp, order);
-	if (page) {
-		dma_addr_t addr;
-
-		/*
-		 * Since we will be clearing the encryption bit, check the
-		 * mask with it already cleared.
-		 */
-		addr = __sme_clr(phys_to_dma(dev, page_to_phys(page)));
-		if ((addr + size) > dev->coherent_dma_mask) {
-			__free_pages(page, get_order(size));
-		} else {
-			vaddr = page_address(page);
-			*dma_handle = addr;
-		}
-	}
-
-	if (!vaddr)
-		vaddr = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
-
-	if (!vaddr)
-		return NULL;
-
-	/* Clear the SME encryption bit for DMA use if not swiotlb area */
-	if (!is_swiotlb_buffer(dma_to_phys(dev, *dma_handle))) {
-		set_memory_decrypted((unsigned long)vaddr, 1 << order);
-		memset(vaddr, 0, PAGE_SIZE << order);
-		*dma_handle = __sme_clr(*dma_handle);
-	}
-
-	return vaddr;
-}
-
-static void sev_free(struct device *dev, size_t size, void *vaddr,
-		     dma_addr_t dma_handle, unsigned long attrs)
-{
-	/* Set the SME encryption bit for re-use if not swiotlb area */
-	if (!is_swiotlb_buffer(dma_to_phys(dev, dma_handle)))
-		set_memory_encrypted((unsigned long)vaddr,
-				     1 << get_order(size));
-
-	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
-}
-
 static void __init __set_clr_pte_enc(pte_t *kpte, int level, bool enc)
 {
 	pgprot_t old_prot, new_prot;

@@ -404,20 +352,6 @@ bool sev_active(void)
 }
 EXPORT_SYMBOL_GPL(sev_active);
 
-static const struct dma_map_ops sev_dma_ops = {
-	.alloc                  = sev_alloc,
-	.free                   = sev_free,
-	.map_page               = swiotlb_map_page,
-	.unmap_page             = swiotlb_unmap_page,
-	.map_sg                 = swiotlb_map_sg_attrs,
-	.unmap_sg               = swiotlb_unmap_sg_attrs,
-	.sync_single_for_cpu    = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu        = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device     = swiotlb_sync_sg_for_device,
-	.mapping_error          = swiotlb_dma_mapping_error,
-};
-
 /* Architecture __weak replacement functions */
 void __init mem_encrypt_init(void)
 {

@@ -428,12 +362,11 @@ void __init mem_encrypt_init(void)
 	swiotlb_update_mem_attributes();
 
 	/*
-	 * With SEV, DMA operations cannot use encryption. New DMA ops
-	 * are required in order to mark the DMA areas as decrypted or
-	 * to use bounce buffers.
+	 * With SEV, DMA operations cannot use encryption, we need to use
+	 * SWIOTLB to bounce buffer DMA operation.
 	 */
 	if (sev_active())
-		dma_ops = &sev_dma_ops;
+		dma_ops = &swiotlb_dma_ops;
 
 	/*
 	 * With SEV, we need to unroll the rep string I/O instructions.

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 4b69b008d5aa..15ad3025e439 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c

@@ -243,11 +243,11 @@ bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 }
 
 /**
- * phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
+ * __phys_to_dma - Return the DMA AMBA address used for this STA2x11 device
  * @dev: device for a PCI device
  * @paddr: Physical address
  */
-dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	if (dev->dma_ops != &sta2x11_dma_ops)
 		return paddr;

@@ -259,7 +259,7 @@ dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  * @dev: device for a PCI device
  * @daddr: STA2x11 AMBA DMA address
  */
-phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
 	if (dev->dma_ops != &sta2x11_dma_ops)
 		return daddr;

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index bcdb1a3e4b1f..e7f5ac7efcb5 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h

@@ -3,18 +3,19 @@
 #define _LINUX_DMA_DIRECT_H 1
 
 #include <linux/dma-mapping.h>
+#include <linux/mem_encrypt.h>
 
 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
 #include <asm/dma-direct.h>
 #else
-static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	dma_addr_t dev_addr = (dma_addr_t)paddr;
 
 	return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
 }
 
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
+static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 {
 	phys_addr_t paddr = (phys_addr_t)dev_addr;

@@ -30,6 +31,24 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 }
 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
 
+/*
+ * If memory encryptition is supported, phys_to_dma will set the memory
+ * encryption bit in the DMA address, and dma_to_phys will clear it.
+ * The raw __phys_to_dma and __dma_to_phys should only be used on
+ * non-encrypted memory for special occasions like DMA coherent buffers.
+ */
+static __always_inline dma_addr_t phys_to_dma(struct device *dev,
+		phys_addr_t paddr)
+{
+	return __sme_set(__phys_to_dma(dev, paddr));
+}
+
+static __always_inline phys_addr_t dma_to_phys(struct device *dev,
+		dma_addr_t daddr)
+{
+	return __sme_clr(__dma_to_phys(dev, daddr));
+}
+
 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
 void dma_mark_clean(void *addr, size_t size);
 #else

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index 5bb289483efc..2e2dcb1ae0a1 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -9,6 +9,7 @@
 #include <linux/scatterlist.h>
 #include <linux/dma-contiguous.h>
 #include <linux/pfn.h>
+#include <linux/set_memory.h>
 
 #define DIRECT_MAPPING_ERROR		0

@@ -36,9 +37,13 @@ check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
 	return true;
 }
 
+/*
+ * Since we will be clearing the encryption bit, check the mask with it already
+ * cleared.
+ */
 static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
 {
-	return phys_to_dma(dev, phys) + size <= dev->coherent_dma_mask;
+	return __phys_to_dma(dev, phys) + size <= dev->coherent_dma_mask;
 }
 
 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,

@@ -47,6 +52,7 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	int page_order = get_order(size);
 	struct page *page = NULL;
+	void *ret;
 
 	/* GFP_DMA32 and GFP_DMA are no ops without the corresponding zones: */
 	if (dev->coherent_dma_mask < DMA_BIT_MASK(32))

@@ -79,19 +85,27 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 
 	if (!page)
 		return NULL;
+	*dma_handle = __phys_to_dma(dev, page_to_phys(page));
+	ret = page_address(page);
 
-	*dma_handle = phys_to_dma(dev, page_to_phys(page));
-	memset(page_address(page), 0, size);
-	return page_address(page);
+	/* Clear the memory encryption bit */
+	set_memory_decrypted((unsigned long)ret, page_order);
+
+	memset(ret, 0, size);
+	return ret;
 }
 
 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
 		dma_addr_t dma_addr, unsigned long attrs)
 {
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+	unsigned int page_order = get_order(size);
+
+	/* Set the SME encryption bit for re-use */
+	set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order);
 
 	if (!dma_release_from_contiguous(dev, virt_to_page(cpu_addr), count))
-		free_pages((unsigned long)cpu_addr, get_order(size));
+		free_pages((unsigned long)cpu_addr, page_order);
 }
 
 static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 905eea6353a3..85b2ad9299e3 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -158,13 +158,6 @@ unsigned long swiotlb_size_or_default(void)
 
 void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size) { }
 
-/* For swiotlb, clear memory encryption mask from dma addresses */
-static dma_addr_t swiotlb_phys_to_dma(struct device *hwdev,
-				      phys_addr_t address)
-{
-	return __sme_clr(phys_to_dma(hwdev, address));
-}
-
 /* Note that this doesn't work with highmem page */
 static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
 				      volatile void *address)

@@ -623,7 +616,7 @@ map_single(struct device *hwdev, phys_addr_t phys, size_t size,
 		return SWIOTLB_MAP_ERROR;
 	}
 
-	start_dma_addr = swiotlb_phys_to_dma(hwdev, io_tlb_start);
+	start_dma_addr = __phys_to_dma(hwdev, io_tlb_start);
 	return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size,
 				      dir, attrs);
 }

@@ -718,12 +711,12 @@ swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle)
 		goto out_warn;
 
 	phys_addr = swiotlb_tbl_map_single(dev,
-			swiotlb_phys_to_dma(dev, io_tlb_start),
+			__phys_to_dma(dev, io_tlb_start),
 			0, size, DMA_FROM_DEVICE, 0);
 	if (phys_addr == SWIOTLB_MAP_ERROR)
 		goto out_warn;
 
-	*dma_handle = swiotlb_phys_to_dma(dev, phys_addr);
+	*dma_handle = __phys_to_dma(dev, phys_addr);
 
 	/* Confirm address can be DMA'd by device */
 	if (*dma_handle + size - 1 > dev->coherent_dma_mask)

@@ -861,10 +854,10 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 	map = map_single(dev, phys, size, dir, attrs);
 	if (map == SWIOTLB_MAP_ERROR) {
 		swiotlb_full(dev, size, dir, 1);
-		return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
+		return __phys_to_dma(dev, io_tlb_overflow_buffer);
 	}
 
-	dev_addr = swiotlb_phys_to_dma(dev, map);
+	dev_addr = __phys_to_dma(dev, map);
 
 	/* Ensure that the address returned is DMA'ble */
 	if (dma_capable(dev, dev_addr, size))

@@ -873,7 +866,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 	attrs |= DMA_ATTR_SKIP_CPU_SYNC;
 	swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
 
-	return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
+	return __phys_to_dma(dev, io_tlb_overflow_buffer);
 }
 EXPORT_SYMBOL_GPL(swiotlb_map_page);

@@ -1007,7 +1000,7 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
 				sg_dma_len(sgl) = 0;
 				return 0;
 			}
-			sg->dma_address = swiotlb_phys_to_dma(hwdev, map);
+			sg->dma_address = __phys_to_dma(hwdev, map);
 		} else
 			sg->dma_address = dev_addr;
 		sg_dma_len(sg) = sg->length;

@@ -1075,7 +1068,7 @@ EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
 int
 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
 {
-	return (dma_addr == swiotlb_phys_to_dma(hwdev, io_tlb_overflow_buffer));
+	return (dma_addr == __phys_to_dma(hwdev, io_tlb_overflow_buffer));
 }
 EXPORT_SYMBOL(swiotlb_dma_mapping_error);

@@ -1088,7 +1081,7 @@ EXPORT_SYMBOL(swiotlb_dma_mapping_error);
 int
 swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
-	return swiotlb_phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
+	return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
 EXPORT_SYMBOL(swiotlb_dma_supported);

-- 
2.14.2

[PATCH 53/67] swiotlb: remove swiotlb_set_mem_attributes

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:33

Now that set_memory_decrypted is always available we can just call
it directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/mem_encrypt.h |  2 --
 arch/x86/mm/mem_encrypt.c          |  9 ---------
 lib/swiotlb.c                      | 12 ++++++------
 3 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index c9459a4c3c68..549894d496da 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h

@@ -48,8 +48,6 @@ int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
 /* Architecture __weak replacement functions */
 void __init mem_encrypt_init(void);
 
-void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
-
 bool sme_active(void);
 bool sev_active(void);

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 93de36cc3dd9..b279e90c85cd 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c

@@ -379,15 +379,6 @@ void __init mem_encrypt_init(void)
 			     : "Secure Memory Encryption (SME)");
 }
 
-void swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
-{
-	WARN(PAGE_ALIGN(size) != size,
-	     "size is not page-aligned (%#lx)\n", size);
-
-	/* Make the SWIOTLB buffer area decrypted */
-	set_memory_decrypted((unsigned long)vaddr, size >> PAGE_SHIFT);
-}
-
 static void __init sme_clear_pgd(pgd_t *pgd_base, unsigned long start,
 				 unsigned long end)
 {

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 85b2ad9299e3..4ea0b5710618 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -31,6 +31,7 @@
 #include <linux/gfp.h>
 #include <linux/scatterlist.h>
 #include <linux/mem_encrypt.h>
+#include <linux/set_memory.h>
 
 #include <asm/io.h>
 #include <asm/dma.h>

@@ -156,8 +157,6 @@ unsigned long swiotlb_size_or_default(void)
 	return size ? size : (IO_TLB_DEFAULT_SIZE);
 }
 
-void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size) { }
-
 /* Note that this doesn't work with highmem page */
 static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
 				      volatile void *address)

@@ -202,12 +201,12 @@ void __init swiotlb_update_mem_attributes(void)
 
 	vaddr = phys_to_virt(io_tlb_start);
 	bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
-	swiotlb_set_mem_attributes(vaddr, bytes);
+	set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
 	memset(vaddr, 0, bytes);
 
 	vaddr = phys_to_virt(io_tlb_overflow_buffer);
 	bytes = PAGE_ALIGN(io_tlb_overflow);
-	swiotlb_set_mem_attributes(vaddr, bytes);
+	set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
 	memset(vaddr, 0, bytes);
 }

@@ -348,7 +347,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 	io_tlb_start = virt_to_phys(tlb);
 	io_tlb_end = io_tlb_start + bytes;
 
-	swiotlb_set_mem_attributes(tlb, bytes);
+	set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
 	memset(tlb, 0, bytes);
 
 	/*

@@ -359,7 +358,8 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 	if (!v_overflow_buffer)
 		goto cleanup2;
 
-	swiotlb_set_mem_attributes(v_overflow_buffer, io_tlb_overflow);
+	set_memory_decrypted((unsigned long)v_overflow_buffer,
+			io_tlb_overflow >> PAGE_SHIFT);
 	memset(v_overflow_buffer, 0, io_tlb_overflow);
 	io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);

-- 
2.14.2

[PATCH 56/67] ia64: use generic swiotlb_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:43

These are identical to the ia64 ops, and would also support CMA
if enabled on ia64.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/ia64/Kconfig                |  5 +++++
 arch/ia64/hp/common/hwsw_iommu.c |  4 ++--
 arch/ia64/hp/common/sba_iommu.c  |  6 +++---
 arch/ia64/kernel/pci-swiotlb.c   | 38 +++-----------------------------------
 4 files changed, 13 insertions(+), 40 deletions(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 888acdb163cb..29148fe4bf5a 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig

@@ -146,6 +146,7 @@ config IA64_GENERIC
 	bool "generic"
 	select NUMA
 	select ACPI_NUMA
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 	select PCI_MSI
 	help

@@ -166,6 +167,7 @@ config IA64_GENERIC
 
 config IA64_DIG
 	bool "DIG-compliant"
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 
 config IA64_DIG_VTD

@@ -181,6 +183,7 @@ config IA64_HP_ZX1
 
 config IA64_HP_ZX1_SWIOTLB
 	bool "HP-zx1/sx1000 with software I/O TLB"
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Build a kernel that runs on HP zx1 and sx1000 systems even when they

@@ -204,6 +207,7 @@ config IA64_SGI_UV
 	bool "SGI-UV"
 	select NUMA
 	select ACPI_NUMA
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 	help
 	  Selecting this option will optimize the kernel for use on UV based

@@ -214,6 +218,7 @@ config IA64_SGI_UV
 
 config IA64_HP_SIM
 	bool "Ski-simulator"
+	select DMA_DIRECT_OPS
 	select SWIOTLB
 	depends on !PM

diff --git a/arch/ia64/hp/common/hwsw_iommu.c b/arch/ia64/hp/common/hwsw_iommu.c
index 41279f0442bd..58969039bed2 100644
--- a/arch/ia64/hp/common/hwsw_iommu.c
+++ b/arch/ia64/hp/common/hwsw_iommu.c

@@ -19,7 +19,7 @@
 #include <linux/export.h>
 #include <asm/machvec.h>
 
-extern const struct dma_map_ops sba_dma_ops, ia64_swiotlb_dma_ops;
+extern const struct dma_map_ops sba_dma_ops;
 
 /* swiotlb declarations & definitions: */
 extern int swiotlb_late_init_with_default_size (size_t size);

@@ -38,7 +38,7 @@ static inline int use_swiotlb(struct device *dev)
 const struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
 {
 	if (use_swiotlb(dev))
-		return &ia64_swiotlb_dma_ops;
+		return &swiotlb_dma_ops;
 	return &sba_dma_ops;
 }
 EXPORT_SYMBOL(hwsw_dma_get_ops);

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index d68849ad2ee1..6f05aba9012f 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c

@@ -2093,7 +2093,7 @@ static int __init acpi_sba_ioc_init_acpi(void)
 /* This has to run before acpi_scan_init(). */
 arch_initcall(acpi_sba_ioc_init_acpi);
 
-extern const struct dma_map_ops ia64_swiotlb_dma_ops;
+extern const struct dma_map_ops swiotlb_dma_ops;
 
 static int __init
 sba_init(void)

@@ -2108,7 +2108,7 @@ sba_init(void)
 	 * a successful kdump kernel boot is to use the swiotlb.
 	 */
 	if (is_kdump_kernel()) {
-		dma_ops = &ia64_swiotlb_dma_ops;
+		dma_ops = &swiotlb_dma_ops;
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to initialize software I/O TLB:"
 				  " Try machvec=dig boot option");

@@ -2130,7 +2130,7 @@ sba_init(void)
 		 * If we didn't find something sba_iommu can claim, we
 		 * need to setup the swiotlb and switch to the dig machvec.
 		 */
-		dma_ops = &ia64_swiotlb_dma_ops;
+		dma_ops = &swiotlb_dma_ops;
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to find SBA IOMMU or initialize "
 			      "software I/O TLB: Try machvec=dig boot option");

diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
index 4a9a6e58ad6a..0f8d5fbd86bd 100644
--- a/arch/ia64/kernel/pci-swiotlb.c
+++ b/arch/ia64/kernel/pci-swiotlb.c

@@ -6,8 +6,7 @@
 #include <linux/cache.h>
 #include <linux/module.h>
 #include <linux/dma-mapping.h>
-
-#include <asm/swiotlb.h>
+#include <linux/swiotlb.h>
 #include <asm/dma.h>
 #include <asm/iommu.h>
 #include <asm/machvec.h>

@@ -15,40 +14,9 @@
 int swiotlb __read_mostly;
 EXPORT_SYMBOL(swiotlb);
 
-static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
-					 dma_addr_t *dma_handle, gfp_t gfp,
-					 unsigned long attrs)
-{
-	if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
-		gfp |= GFP_DMA32;
-	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
-}
-
-static void ia64_swiotlb_free_coherent(struct device *dev, size_t size,
-				       void *vaddr, dma_addr_t dma_addr,
-				       unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_addr);
-}
-
-const struct dma_map_ops ia64_swiotlb_dma_ops = {
-	.alloc = ia64_swiotlb_alloc_coherent,
-	.free = ia64_swiotlb_free_coherent,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.dma_supported = swiotlb_dma_supported,
-	.mapping_error = swiotlb_dma_mapping_error,
-};
-
 void __init swiotlb_dma_init(void)
 {
-	dma_ops = &ia64_swiotlb_dma_ops;
+	dma_ops = &swiotlb_dma_ops;
 	swiotlb_init(1);
 }

@@ -60,7 +28,7 @@ void __init pci_swiotlb_init(void)
 		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
 		machvec_init("dig");
 		swiotlb_init(1);
-		dma_ops = &ia64_swiotlb_dma_ops;
+		dma_ops = &swiotlb_dma_ops;
 #else
 		panic("Unable to find Intel IOMMU");
 #endif

-- 
2.14.2

[PATCH 58/67] ia64: remove an ifdef around the content of pci-dma.c

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:23:53

The file is only compiled if CONFIG_INTEL_IOMMU is set to start with.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/ia64/kernel/pci-dma.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index 35e0cad33b7d..b5df084c0af4 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c

@@ -12,12 +12,7 @@
 #include <asm/iommu.h>
 #include <asm/machvec.h>
 #include <linux/dma-mapping.h>
-
-
-#ifdef CONFIG_INTEL_IOMMU
-
 #include <linux/kernel.h>
-
 #include <asm/page.h>
 
 dma_addr_t bad_dma_address __read_mostly;

@@ -115,5 +110,3 @@ void __init pci_iommu_alloc(void)
 	}
 #endif /* CONFIG_SWIOTLB */
 }
-
-#endif

-- 
2.14.2

[PATCH 60/67] tile: replace ZONE_DMA with ZONE_DMA32

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:03

tile uses ZONE_DMA for allocations below 32-bits.  These days we
name the zone for that ZONE_DMA32, which will allow to use the
dma-direct and generic swiotlb code as-is, so rename it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/tile/Kconfig          | 2 +-
 arch/tile/kernel/pci-dma.c | 4 ++--
 arch/tile/kernel/setup.c   | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 02f269cfa538..30c586686f29 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig

@@ -249,7 +249,7 @@ config HIGHMEM
 
 	  If unsure, say "true".
 
-config ZONE_DMA
+config ZONE_DMA32
 	def_bool y
 
 config IOMMU_HELPER

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index 9072e2c25e59..a9b48520eeb9 100644
--- a/arch/tile/kernel/pci-dma.c
+++ b/arch/tile/kernel/pci-dma.c

@@ -54,7 +54,7 @@ static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
 	 * which case we will return NULL.  But such devices are uncommon.
 	 */
 	if (dma_mask <= DMA_BIT_MASK(32)) {
-		gfp |= GFP_DMA;
+		gfp |= GFP_DMA32;
 		node = 0;
 	}

@@ -515,7 +515,7 @@ static void *tile_swiotlb_alloc_coherent(struct device *dev, size_t size,
 					 dma_addr_t *dma_handle, gfp_t gfp,
 					 unsigned long attrs)
 {
-	gfp |= GFP_DMA;
+	gfp |= GFP_DMA32;
 	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
 }

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index ad83c1e66dbd..eb4e198f6f93 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c

@@ -814,11 +814,11 @@ static void __init zone_sizes_init(void)
 #endif
 
 		if (start < dma_end) {
-			zones_size[ZONE_DMA] = min(zones_size[ZONE_NORMAL],
+			zones_size[ZONE_DMA32] = min(zones_size[ZONE_NORMAL],
 						   dma_end - start);
-			zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA];
+			zones_size[ZONE_NORMAL] -= zones_size[ZONE_DMA32];
 		} else {
-			zones_size[ZONE_DMA] = 0;
+			zones_size[ZONE_DMA32] = 0;
 		}
 
 		/* Take zone metadata from controller 0 if we're isolnode. */

@@ -830,7 +830,7 @@ static void __init zone_sizes_init(void)
 		       PFN_UP(node_percpu[i]));
 
 		/* Track the type of memory on each node */
-		if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA])
+		if (zones_size[ZONE_NORMAL] || zones_size[ZONE_DMA32])
 			node_set_state(i, N_NORMAL_MEMORY);
 #ifdef CONFIG_HIGHMEM
 		if (end != start)

-- 
2.14.2

[PATCH 61/67] tile: use generic swiotlb_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:06

These are identical to the tile ops, and would also support CMA
if enabled on tile.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/tile/Kconfig          |  1 +
 arch/tile/kernel/pci-dma.c | 36 +++---------------------------------
 2 files changed, 4 insertions(+), 33 deletions(-)

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 30c586686f29..ef9d403cbbe4 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig

@@ -261,6 +261,7 @@ config NEED_SG_DMA_LENGTH
 config SWIOTLB
 	bool
 	default TILEGX
+	select DMA_DIRECT_OPS
 	select IOMMU_HELPER
 	select NEED_SG_DMA_LENGTH
 	select ARCH_HAS_DMA_SET_COHERENT_MASK

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index a9b48520eeb9..6e9365234b6a 100644
--- a/arch/tile/kernel/pci-dma.c
+++ b/arch/tile/kernel/pci-dma.c

@@ -511,39 +511,9 @@ EXPORT_SYMBOL(gx_pci_dma_map_ops);
 /* PCI DMA mapping functions for legacy PCI devices */
 
 #ifdef CONFIG_SWIOTLB
-static void *tile_swiotlb_alloc_coherent(struct device *dev, size_t size,
-					 dma_addr_t *dma_handle, gfp_t gfp,
-					 unsigned long attrs)
-{
-	gfp |= GFP_DMA32;
-	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
-}
-
-static void tile_swiotlb_free_coherent(struct device *dev, size_t size,
-				       void *vaddr, dma_addr_t dma_addr,
-				       unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_addr);
-}
-
-static const struct dma_map_ops pci_swiotlb_dma_ops = {
-	.alloc = tile_swiotlb_alloc_coherent,
-	.free = tile_swiotlb_free_coherent,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.dma_supported = swiotlb_dma_supported,
-	.mapping_error = swiotlb_dma_mapping_error,
-};
-
 static const struct dma_map_ops pci_hybrid_dma_ops = {
-	.alloc = tile_swiotlb_alloc_coherent,
-	.free = tile_swiotlb_free_coherent,
+	.alloc = swiotlb_alloc,
+	.free = swiotlb_free,
 	.map_page = tile_pci_dma_map_page,
 	.unmap_page = tile_pci_dma_unmap_page,
 	.map_sg = tile_pci_dma_map_sg,

@@ -554,7 +524,7 @@ static const struct dma_map_ops pci_hybrid_dma_ops = {
 	.sync_sg_for_device = tile_pci_dma_sync_sg_for_device,
 };
 
-const struct dma_map_ops *gx_legacy_pci_dma_map_ops = &pci_swiotlb_dma_ops;
+const struct dma_map_ops *gx_legacy_pci_dma_map_ops = &swiotlb_dma_ops;
 const struct dma_map_ops *gx_hybrid_pci_dma_map_ops = &pci_hybrid_dma_ops;
 #else
 const struct dma_map_ops *gx_legacy_pci_dma_map_ops;

-- 
2.14.2

[PATCH 64/67] arm64: replace ZONE_DMA with ZONE_DMA32

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:16

arm64 uses ZONE_DMA for allocations below 32-bits.  These days we
name the zone for that ZONE_DMA32, which will allow to use the
dma-direct and generic swiotlb code as-is, so rename it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm64/Kconfig          |  2 +-
 arch/arm64/mm/dma-mapping.c |  6 +++---
 arch/arm64/mm/init.c        | 16 ++++++++--------
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c9a7e9e1414f..6b6985f15d02 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig

@@ -227,7 +227,7 @@ config GENERIC_CSUM
 config GENERIC_CALIBRATE_DELAY
 	def_bool y
 
-config ZONE_DMA
+config ZONE_DMA32
 	def_bool y
 
 config HAVE_GENERIC_GUP

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 6840426bbe77..0d641875b20e 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c

@@ -95,9 +95,9 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
 				  dma_addr_t *dma_handle, gfp_t flags,
 				  unsigned long attrs)
 {
-	if (IS_ENABLED(CONFIG_ZONE_DMA) &&
+	if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
 	    dev->coherent_dma_mask <= DMA_BIT_MASK(32))
-		flags |= GFP_DMA;
+		flags |= GFP_DMA32;
 	if (dev_get_cma_area(dev) && gfpflags_allow_blocking(flags)) {
 		struct page *page;
 		void *addr;

@@ -397,7 +397,7 @@ static int __init atomic_pool_init(void)
 		page = dma_alloc_from_contiguous(NULL, nr_pages,
 						 pool_size_order, GFP_KERNEL);
 	else
-		page = alloc_pages(GFP_DMA, pool_size_order);
+		page = alloc_pages(GFP_DMA32, pool_size_order);
 
 	if (page) {
 		int ret;

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 00e7b900ca41..8f03276443c9 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c

@@ -217,7 +217,7 @@ static void __init reserve_elfcorehdr(void)
 }
 #endif /* CONFIG_CRASH_DUMP */
 /*
- * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
+ * Return the maximum physical address for ZONE_DMA32 (DMA_BIT_MASK(32)). It
  * currently assumes that for memory starting above 4G, 32-bit devices will
  * use a DMA offset.
  */

@@ -233,8 +233,8 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 {
 	unsigned long max_zone_pfns[MAX_NR_ZONES]  = {0};
 
-	if (IS_ENABLED(CONFIG_ZONE_DMA))
-		max_zone_pfns[ZONE_DMA] = PFN_DOWN(max_zone_dma_phys());
+	if (IS_ENABLED(CONFIG_ZONE_DMA32))
+		max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
 	max_zone_pfns[ZONE_NORMAL] = max;
 
 	free_area_init_nodes(max_zone_pfns);

@@ -251,9 +251,9 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 	memset(zone_size, 0, sizeof(zone_size));
 
 	/* 4GB maximum for 32-bit only capable devices */
-#ifdef CONFIG_ZONE_DMA
+#ifdef CONFIG_ZONE_DMA32
 	max_dma = PFN_DOWN(arm64_dma_phys_limit);
-	zone_size[ZONE_DMA] = max_dma - min;
+	zone_size[ZONE_DMA32] = max_dma - min;
 #endif
 	zone_size[ZONE_NORMAL] = max - max_dma;

@@ -266,10 +266,10 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 		if (start >= max)
 			continue;
 
-#ifdef CONFIG_ZONE_DMA
+#ifdef CONFIG_ZONE_DMA32
 		if (start < max_dma) {
 			unsigned long dma_end = min(end, max_dma);
-			zhole_size[ZONE_DMA] -= dma_end - start;
+			zhole_size[ZONE_DMA32] -= dma_end - start;
 		}
 #endif
 		if (end > max_dma) {

@@ -467,7 +467,7 @@ void __init arm64_memblock_init(void)
 	early_init_fdt_scan_reserved_mem();
 
 	/* 4GB maximum for 32-bit only capable devices */
-	if (IS_ENABLED(CONFIG_ZONE_DMA))
+	if (IS_ENABLED(CONFIG_ZONE_DMA32))
 		arm64_dma_phys_limit = max_zone_dma_phys();
 	else
 		arm64_dma_phys_limit = PHYS_MASK + 1;

-- 
2.14.2

[PATCH 66/67] swiotlb: remove swiotlb_{alloc,free}_coherent

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:28

Unused now that everyone uses swiotlb_{alloc,free}.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/swiotlb.h |  8 --------
 lib/swiotlb.c           | 41 -----------------------------------------
 2 files changed, 49 deletions(-)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 5b1f2a00491c..965be92c33b5 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h

@@ -72,14 +72,6 @@ void *swiotlb_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
 void swiotlb_free(struct device *dev, size_t size, void *vaddr,
 		dma_addr_t dma_addr, unsigned long attrs);
 
-extern void
-*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-			dma_addr_t *dma_handle, gfp_t flags);
-
-extern void
-swiotlb_free_coherent(struct device *hwdev, size_t size,
-		      void *vaddr, dma_addr_t dma_handle);
-
 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 				   unsigned long offset, size_t size,
 				   enum dma_data_direction dir,

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 4ea0b5710618..77a40b508db8 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -157,13 +157,6 @@ unsigned long swiotlb_size_or_default(void)
 	return size ? size : (IO_TLB_DEFAULT_SIZE);
 }
 
-/* Note that this doesn't work with highmem page */
-static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
-				      volatile void *address)
-{
-	return phys_to_dma(hwdev, virt_to_phys(address));
-}
-
 static bool no_iotlb_memory;
 
 void swiotlb_print_info(void)

@@ -743,31 +736,6 @@ swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle)
 	return NULL;
 }
 
-void *
-swiotlb_alloc_coherent(struct device *hwdev, size_t size,
-		       dma_addr_t *dma_handle, gfp_t flags)
-{
-	int order = get_order(size);
-	void *ret;
-
-	ret = (void *)__get_free_pages(flags, order);
-	if (ret) {
-		*dma_handle = swiotlb_virt_to_bus(hwdev, ret);
-		if (*dma_handle  + size - 1 <= hwdev->coherent_dma_mask) {
-			memset(ret, 0, size);
-			return ret;
-		}
-
-		/*
-		 * The allocated memory isn't reachable by the device.
-		 */
-		free_pages((unsigned long) ret, order);
-	}
-
-	return swiotlb_alloc_buffer(hwdev, size, dma_handle);
-}
-EXPORT_SYMBOL(swiotlb_alloc_coherent);
-
 static bool swiotlb_free_buffer(struct device *dev, size_t size,
 		dma_addr_t dma_addr)
 {

@@ -787,15 +755,6 @@ static bool swiotlb_free_buffer(struct device *dev, size_t size,
 	return true;
 }
 
-void
-swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
-		      dma_addr_t dev_addr)
-{
-	if (!swiotlb_free_buffer(hwdev, size, dev_addr))
-		free_pages((unsigned long)vaddr, get_order(size));
-}
-EXPORT_SYMBOL(swiotlb_free_coherent);
-
 static void
 swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
 	     int do_panic)

-- 
2.14.2

[PATCH 65/67] arm64: use swiotlb_alloc and swiotlb_free

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:33

The generic swiotlb_alloc and swiotlb_free routines already take care
of CMA allocations and adding GFP_DMA32 where needed, so use them
instead of the arm specific helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/arm64/Kconfig          |  1 +
 arch/arm64/mm/dma-mapping.c | 46 +++------------------------------------------
 2 files changed, 4 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6b6985f15d02..53205c02b18a 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig

@@ -59,6 +59,7 @@ config ARM64
 	select COMMON_CLK
 	select CPU_PM if (SUSPEND || CPU_IDLE)
 	select DCACHE_WORD_ACCESS
+	select DMA_DIRECT_OPS
 	select EDAC_SUPPORT
 	select FRAME_POINTER
 	select GENERIC_ALLOCATOR

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 0d641875b20e..a96ec0181818 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c

@@ -91,46 +91,6 @@ static int __free_from_pool(void *start, size_t size)
 	return 1;
 }
 
-static void *__dma_alloc_coherent(struct device *dev, size_t size,
-				  dma_addr_t *dma_handle, gfp_t flags,
-				  unsigned long attrs)
-{
-	if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
-	    dev->coherent_dma_mask <= DMA_BIT_MASK(32))
-		flags |= GFP_DMA32;
-	if (dev_get_cma_area(dev) && gfpflags_allow_blocking(flags)) {
-		struct page *page;
-		void *addr;
-
-		page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
-						 get_order(size), flags);
-		if (!page)
-			return NULL;
-
-		*dma_handle = phys_to_dma(dev, page_to_phys(page));
-		addr = page_address(page);
-		memset(addr, 0, size);
-		return addr;
-	} else {
-		return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
-	}
-}
-
-static void __dma_free_coherent(struct device *dev, size_t size,
-				void *vaddr, dma_addr_t dma_handle,
-				unsigned long attrs)
-{
-	bool freed;
-	phys_addr_t paddr = dma_to_phys(dev, dma_handle);
-
-
-	freed = dma_release_from_contiguous(dev,
-					phys_to_page(paddr),
-					size >> PAGE_SHIFT);
-	if (!freed)
-		swiotlb_free_coherent(dev, size, vaddr, dma_handle);
-}
-
 static void *__dma_alloc(struct device *dev, size_t size,
 			 dma_addr_t *dma_handle, gfp_t flags,
 			 unsigned long attrs)

@@ -152,7 +112,7 @@ static void *__dma_alloc(struct device *dev, size_t size,
 		return addr;
 	}
 
-	ptr = __dma_alloc_coherent(dev, size, dma_handle, flags, attrs);
+	ptr = swiotlb_alloc(dev, size, dma_handle, flags, attrs);
 	if (!ptr)
 		goto no_mem;

@@ -173,7 +133,7 @@ static void *__dma_alloc(struct device *dev, size_t size,
 	return coherent_ptr;
 
 no_map:
-	__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
+	swiotlb_free(dev, size, ptr, *dma_handle, attrs);
 no_mem:
 	return NULL;
 }

@@ -191,7 +151,7 @@ static void __dma_free(struct device *dev, size_t size,
 			return;
 		vunmap(vaddr);
 	}
-	__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
+	swiotlb_free(dev, size, swiotlb_addr, dma_handle, attrs);
 }
 
 static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,

-- 
2.14.2

[PATCH 67/67] swiotlb: remove various exports

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:24:37

All these symbols are only used by arch dma_ops implementations or
xen-swiotlb.  None of which can be modular.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 77a40b508db8..823e1055a394 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -591,7 +591,6 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 
 	return tlb_addr;
 }
-EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
 
 /*
  * Allocates bounce buffer and returns its kernel virtual address.

@@ -661,7 +660,6 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
 	}
 	spin_unlock_irqrestore(&io_tlb_lock, flags);
 }
-EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single);
 
 void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 			     size_t size, enum dma_data_direction dir,

@@ -693,7 +691,6 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 		BUG();
 	}
 }
-EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single);
 
 static void *
 swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle)

@@ -827,7 +824,6 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 
 	return __phys_to_dma(dev, io_tlb_overflow_buffer);
 }
-EXPORT_SYMBOL_GPL(swiotlb_map_page);
 
 /*
  * Unmap a single streaming mode DMA translation.  The dma_addr and size must

@@ -868,7 +864,6 @@ void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 {
 	unmap_single(hwdev, dev_addr, size, dir, attrs);
 }
-EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
 
 /*
  * Make physical memory consistent for a single streaming mode DMA translation

@@ -906,7 +901,6 @@ swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
 {
 	swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
 }
-EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
 
 void
 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,

@@ -914,7 +908,6 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 {
 	swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
 }
-EXPORT_SYMBOL(swiotlb_sync_single_for_device);
 
 /*
  * Map a set of buffers described by scatterlist in streaming mode for DMA.

@@ -966,7 +959,6 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
 	}
 	return nelems;
 }
-EXPORT_SYMBOL(swiotlb_map_sg_attrs);
 
 /*
  * Unmap a set of streaming mode DMA translations.  Again, cpu read rules

@@ -986,7 +978,6 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 		unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir,
 			     attrs);
 }
-EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
 
 /*
  * Make physical memory consistent for a set of streaming mode DMA translations

@@ -1014,7 +1005,6 @@ swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 {
 	swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
 }
-EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
 
 void
 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,

@@ -1022,14 +1012,12 @@ swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 {
 	swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
 }
-EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
 
 int
 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
 {
 	return (dma_addr == __phys_to_dma(hwdev, io_tlb_overflow_buffer));
 }
-EXPORT_SYMBOL(swiotlb_dma_mapping_error);
 
 /*
  * Return whether the given device DMA address mask can be supported

@@ -1042,7 +1030,6 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
 	return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
-EXPORT_SYMBOL(swiotlb_dma_supported);
 
 #ifdef CONFIG_DMA_DIRECT_OPS
 void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,

-- 
2.14.2

[PATCH 63/67] mips: use swiotlb_{alloc,free}

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:25:34

These already include the GFP_DMA/GFP_DMA32 usage, and will use CMA
memory if enabled, thus avoiding the GFP_NORETRY hack.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/mips/cavium-octeon/Kconfig           |  1 +
 arch/mips/cavium-octeon/dma-octeon.c      | 26 +++-----------------------
 arch/mips/loongson64/Kconfig              |  1 +
 arch/mips/loongson64/common/dma-swiotlb.c | 21 ++-------------------
 4 files changed, 7 insertions(+), 42 deletions(-)

diff --git a/arch/mips/cavium-octeon/Kconfig b/arch/mips/cavium-octeon/Kconfig
index 204a1670fd9b..b5eee1a57d6c 100644
--- a/arch/mips/cavium-octeon/Kconfig
+++ b/arch/mips/cavium-octeon/Kconfig

@@ -75,6 +75,7 @@ config NEED_SG_DMA_LENGTH
 
 config SWIOTLB
 	def_bool y
+	select DMA_DIRECT_OPS
 	select IOMMU_HELPER
 	select NEED_SG_DMA_LENGTH

diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index 6440ad3f9e3b..7b335ab21697 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c

@@ -159,33 +159,13 @@ static void octeon_dma_sync_sg_for_device(struct device *dev,
 static void *octeon_dma_alloc_coherent(struct device *dev, size_t size,
 	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
-	void *ret;
-
-	if (IS_ENABLED(CONFIG_ZONE_DMA) && dev == NULL)
-		gfp |= __GFP_DMA;
-	else if (IS_ENABLED(CONFIG_ZONE_DMA) &&
-		 dev->coherent_dma_mask <= DMA_BIT_MASK(24))
-		gfp |= __GFP_DMA;
-	else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
-		 dev->coherent_dma_mask <= DMA_BIT_MASK(32))
-		gfp |= __GFP_DMA32;
-
-	/* Don't invoke OOM killer */
-	gfp |= __GFP_NORETRY;
-
-	ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+	void *ret = swiotlb_alloc(dev, size, dma_handle, gfp, attrs);
 
 	mb();
 
 	return ret;
 }
 
-static void octeon_dma_free_coherent(struct device *dev, size_t size,
-	void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
-}
-
 static dma_addr_t octeon_unity_phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	return paddr;

@@ -225,7 +205,7 @@ EXPORT_SYMBOL(__dma_to_phys);
 static struct octeon_dma_map_ops octeon_linear_dma_map_ops = {
 	.dma_map_ops = {
 		.alloc = octeon_dma_alloc_coherent,
-		.free = octeon_dma_free_coherent,
+		.free = swiotlb_free,
 		.map_page = octeon_dma_map_page,
 		.unmap_page = swiotlb_unmap_page,
 		.map_sg = octeon_dma_map_sg,

@@ -311,7 +291,7 @@ void __init plat_swiotlb_setup(void)
 static struct octeon_dma_map_ops _octeon_pci_dma_map_ops = {
 	.dma_map_ops = {
 		.alloc = octeon_dma_alloc_coherent,
-		.free = octeon_dma_free_coherent,
+		.free = swiotlb_free,
 		.map_page = octeon_dma_map_page,
 		.unmap_page = swiotlb_unmap_page,
 		.map_sg = octeon_dma_map_sg,

diff --git a/arch/mips/loongson64/Kconfig b/arch/mips/loongson64/Kconfig
index 0d249fc3cfe9..6f109bb54cdb 100644
--- a/arch/mips/loongson64/Kconfig
+++ b/arch/mips/loongson64/Kconfig

@@ -136,6 +136,7 @@ config SWIOTLB
 	bool "Soft IOMMU Support for All-Memory DMA"
 	default y
 	depends on CPU_LOONGSON3
+	select DMA_DIRECT_OPS
 	select IOMMU_HELPER
 	select NEED_SG_DMA_LENGTH
 	select NEED_DMA_MAP_STATE

diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c
index 0a02ea70e39f..6a739f8ae110 100644
--- a/arch/mips/loongson64/common/dma-swiotlb.c
+++ b/arch/mips/loongson64/common/dma-swiotlb.c

@@ -13,29 +13,12 @@
 static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
-	void *ret;
+	void *ret = swiotlb_alloc(dev, size, dma_handle, gfp, attrs);
 
-	if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) ||
-	    (IS_ENABLED(CONFIG_ZONE_DMA) &&
-	     dev->coherent_dma_mask < DMA_BIT_MASK(32)))
-		gfp |= __GFP_DMA;
-	else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
-		 dev->coherent_dma_mask < DMA_BIT_MASK(40))
-		gfp |= __GFP_DMA32;
-
-	gfp |= __GFP_NORETRY;
-
-	ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
 	mb();
 	return ret;
 }
 
-static void loongson_dma_free_coherent(struct device *dev, size_t size,
-		void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
-}
-
 static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
 				unsigned long offset, size_t size,
 				enum dma_data_direction dir,

@@ -106,7 +89,7 @@ phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 
 static const struct dma_map_ops loongson_dma_map_ops = {
 	.alloc = loongson_dma_alloc_coherent,
-	.free = loongson_dma_free_coherent,
+	.free = swiotlb_free,
 	.map_page = loongson_dma_map_page,
 	.unmap_page = swiotlb_unmap_page,
 	.map_sg = loongson_dma_map_sg,

-- 
2.14.2

[PATCH 62/67] mips/netlogic: remove swiotlb support

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:26:08

nlm_swiotlb_dma_ops is unused code, so the whole swiotlb support is dead.
If it gets resurrected at some point it should use the generic
swiotlb_dma_ops instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/mips/include/asm/netlogic/common.h |  3 --
 arch/mips/netlogic/Kconfig              |  5 --
 arch/mips/netlogic/common/Makefile      |  1 -
 arch/mips/netlogic/common/nlm-dma.c     | 94 ---------------------------------
 4 files changed, 103 deletions(-)
 delete mode 100644 arch/mips/netlogic/common/nlm-dma.c

diff --git a/arch/mips/include/asm/netlogic/common.h b/arch/mips/include/asm/netlogic/common.h
index a6e6cbebe046..57616649b4f3 100644
--- a/arch/mips/include/asm/netlogic/common.h
+++ b/arch/mips/include/asm/netlogic/common.h

@@ -87,9 +87,6 @@ unsigned int nlm_get_cpu_frequency(void);
 extern const struct plat_smp_ops nlm_smp_ops;
 extern char nlm_reset_entry[], nlm_reset_entry_end[];
 
-/* SWIOTLB */
-extern const struct dma_map_ops nlm_swiotlb_dma_ops;
-
 extern unsigned int nlm_threads_per_core;
 extern cpumask_t nlm_cpumask;

diff --git a/arch/mips/netlogic/Kconfig b/arch/mips/netlogic/Kconfig
index 8296b13affd2..7fcfc7fe9f14 100644
--- a/arch/mips/netlogic/Kconfig
+++ b/arch/mips/netlogic/Kconfig

@@ -89,9 +89,4 @@ config IOMMU_HELPER
 config NEED_SG_DMA_LENGTH
 	bool
 
-config SWIOTLB
-	def_bool y
-	select NEED_SG_DMA_LENGTH
-	select IOMMU_HELPER
-
 endif

diff --git a/arch/mips/netlogic/common/Makefile b/arch/mips/netlogic/common/Makefile
index 60d00b5d748e..89f6e3f39fed 100644
--- a/arch/mips/netlogic/common/Makefile
+++ b/arch/mips/netlogic/common/Makefile

@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-y				+= irq.o time.o
-obj-y				+= nlm-dma.o
 obj-y				+= reset.o
 obj-$(CONFIG_SMP)		+= smp.o smpboot.o
 obj-$(CONFIG_EARLY_PRINTK)	+= earlycons.o

diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
deleted file mode 100644
index 49c975b6aa28..000000000000
--- a/arch/mips/netlogic/common/nlm-dma.c
+++ /dev/null

@@ -1,94 +0,0 @@
-/*
-*  Copyright (C) 2003-2013 Broadcom Corporation
-*  All Rights Reserved
- *
- * This software is available to you under a choice of one of two
- * licenses.  You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the Broadcom
- * license below:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include <linux/dma-mapping.h>
-#include <linux/scatterlist.h>
-#include <linux/bootmem.h>
-#include <linux/export.h>
-#include <linux/swiotlb.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-
-#include <asm/bootinfo.h>
-
-static char *nlm_swiotlb;
-
-static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
-	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
-{
-#ifdef CONFIG_ZONE_DMA32
-	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32))
-		gfp |= __GFP_DMA32;
-#endif
-
-	/* Don't invoke OOM killer */
-	gfp |= __GFP_NORETRY;
-
-	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
-}
-
-static void nlm_dma_free_coherent(struct device *dev, size_t size,
-	void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
-}
-
-const struct dma_map_ops nlm_swiotlb_dma_ops = {
-	.alloc = nlm_dma_alloc_coherent,
-	.free = nlm_dma_free_coherent,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.mapping_error = swiotlb_dma_mapping_error,
-	.dma_supported = swiotlb_dma_supported
-};
-
-void __init plat_swiotlb_setup(void)
-{
-	size_t swiotlbsize;
-	unsigned long swiotlb_nslabs;
-
-	swiotlbsize = 1 << 20; /* 1 MB for now */
-	swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
-	swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
-	swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
-
-	nlm_swiotlb = alloc_bootmem_low_pages(swiotlbsize);
-	swiotlb_init_with_tbl(nlm_swiotlb, swiotlb_nslabs, 1);
-}

-- 
2.14.2

[PATCH 59/67] unicore32: use generic swiotlb_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:26:35

These are identical to the unicore32 ops, and would also support CMA
if enabled on unicore32.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/unicore32/include/asm/dma-mapping.h |  9 +-----
 arch/unicore32/mm/Kconfig                |  1 +
 arch/unicore32/mm/Makefile               |  2 --
 arch/unicore32/mm/dma-swiotlb.c          | 48 --------------------------------
 4 files changed, 2 insertions(+), 58 deletions(-)
 delete mode 100644 arch/unicore32/mm/dma-swiotlb.c

diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index f2bfec273aa7..790bc2ef4af2 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h

@@ -12,18 +12,11 @@
 #ifndef __UNICORE_DMA_MAPPING_H__
 #define __UNICORE_DMA_MAPPING_H__
 
-#ifdef __KERNEL__
-
-#include <linux/mm_types.h>
-#include <linux/scatterlist.h>
 #include <linux/swiotlb.h>
 
-extern const struct dma_map_ops swiotlb_dma_map_ops;
-
 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	return &swiotlb_dma_map_ops;
+	return &swiotlb_dma_ops;
 }
 
-#endif /* __KERNEL__ */
 #endif

diff --git a/arch/unicore32/mm/Kconfig b/arch/unicore32/mm/Kconfig
index c256460cd363..e9154a59d561 100644
--- a/arch/unicore32/mm/Kconfig
+++ b/arch/unicore32/mm/Kconfig

@@ -42,6 +42,7 @@ config CPU_TLB_SINGLE_ENTRY_DISABLE
 
 config SWIOTLB
 	def_bool y
+	select DMA_DIRECT_OPS
 
 config IOMMU_HELPER
 	def_bool SWIOTLB

diff --git a/arch/unicore32/mm/Makefile b/arch/unicore32/mm/Makefile
index 681c0ef5ec9e..8106260583ab 100644
--- a/arch/unicore32/mm/Makefile
+++ b/arch/unicore32/mm/Makefile

@@ -6,8 +6,6 @@
 obj-y				:= extable.o fault.o init.o pgd.o mmu.o
 obj-y				+= flush.o ioremap.o
 
-obj-$(CONFIG_SWIOTLB)		+= dma-swiotlb.o
-
 obj-$(CONFIG_MODULES)		+= proc-syms.o
 
 obj-$(CONFIG_ALIGNMENT_TRAP)	+= alignment.o

diff --git a/arch/unicore32/mm/dma-swiotlb.c b/arch/unicore32/mm/dma-swiotlb.c
deleted file mode 100644
index 525413d6690e..000000000000
--- a/arch/unicore32/mm/dma-swiotlb.c
+++ /dev/null

@@ -1,48 +0,0 @@
-/*
- * Contains routines needed to support swiotlb for UniCore32.
- *
- * Copyright (C) 2010 Guan Xuetao
- *
- * 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/pci.h>
-#include <linux/cache.h>
-#include <linux/module.h>
-#include <linux/dma-mapping.h>
-#include <linux/swiotlb.h>
-#include <linux/bootmem.h>
-
-#include <asm/dma.h>
-
-static void *unicore_swiotlb_alloc_coherent(struct device *dev, size_t size,
-					    dma_addr_t *dma_handle, gfp_t flags,
-					    unsigned long attrs)
-{
-	return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
-}
-
-static void unicore_swiotlb_free_coherent(struct device *dev, size_t size,
-					  void *vaddr, dma_addr_t dma_addr,
-					  unsigned long attrs)
-{
-	swiotlb_free_coherent(dev, size, vaddr, dma_addr);
-}
-
-const struct dma_map_ops swiotlb_dma_map_ops = {
-	.alloc = unicore_swiotlb_alloc_coherent,
-	.free = unicore_swiotlb_free_coherent,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.dma_supported = swiotlb_dma_supported,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.mapping_error = swiotlb_dma_mapping_error,
-};
-EXPORT_SYMBOL(swiotlb_dma_map_ops);

-- 
2.14.2

[PATCH 55/67] ia64: replace ZONE_DMA with ZONE_DMA32

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:27:03

ia64 uses ZONE_DMA for allocations below 32-bits.  These days we
name the zone for that ZONE_DMA32, which will allow to use the
dma-direct and generic swiotlb code as-is, so rename it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/ia64/Kconfig              | 2 +-
 arch/ia64/kernel/pci-swiotlb.c | 2 +-
 arch/ia64/mm/contig.c          | 4 ++--
 arch/ia64/mm/discontig.c       | 8 ++++----
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 4d18fca885ee..888acdb163cb 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig

@@ -66,7 +66,7 @@ config 64BIT
 	select ATA_NONSTANDARD if ATA
 	default y
 
-config ZONE_DMA
+config ZONE_DMA32
 	def_bool y
 	depends on !IA64_SGI_SN2

diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
index f1ae873a8c35..4a9a6e58ad6a 100644
--- a/arch/ia64/kernel/pci-swiotlb.c
+++ b/arch/ia64/kernel/pci-swiotlb.c

@@ -20,7 +20,7 @@ static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
 					 unsigned long attrs)
 {
 	if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
-		gfp |= GFP_DMA;
+		gfp |= GFP_DMA32;
 	return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
 }

diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 52715a71aede..7d64b30913d1 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c

@@ -237,9 +237,9 @@ paging_init (void)
 	unsigned long max_zone_pfns[MAX_NR_ZONES];
 
 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-#ifdef CONFIG_ZONE_DMA
+#ifdef CONFIG_ZONE_DMA32
 	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
-	max_zone_pfns[ZONE_DMA] = max_dma;
+	max_zone_pfns[ZONE_DMA32] = max_dma;
 #endif
 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 9b2d994cddf6..ac46f0d60b66 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c

@@ -38,7 +38,7 @@ struct early_node_data {
 	struct ia64_node_data *node_data;
 	unsigned long pernode_addr;
 	unsigned long pernode_size;
-#ifdef CONFIG_ZONE_DMA
+#ifdef CONFIG_ZONE_DMA32
 	unsigned long num_dma_physpages;
 #endif
 	unsigned long min_pfn;

@@ -669,7 +669,7 @@ static __init int count_node_pages(unsigned long start, unsigned long len, int n
 {
 	unsigned long end = start + len;
 
-#ifdef CONFIG_ZONE_DMA
+#ifdef CONFIG_ZONE_DMA32
 	if (start <= __pa(MAX_DMA_ADDRESS))
 		mem_data[node].num_dma_physpages +=
 			(min(end, __pa(MAX_DMA_ADDRESS)) - start) >>PAGE_SHIFT;

@@ -724,8 +724,8 @@ void __init paging_init(void)
 	}
 
 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-#ifdef CONFIG_ZONE_DMA
-	max_zone_pfns[ZONE_DMA] = max_dma;
+#ifdef CONFIG_ZONE_DMA32
+	max_zone_pfns[ZONE_DMA32] = max_dma;
 #endif
 	max_zone_pfns[ZONE_NORMAL] = max_pfn;
 	free_area_init_nodes(max_zone_pfns);

-- 
2.14.2

[PATCH 57/67] ia64: clean up swiotlb support

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:27:06

Move the few remaining bits of swiotlb glue towards their callers,
and remove the pointless on ia64 swiotlb variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/ia64/include/asm/dma-mapping.h |  1 -
 arch/ia64/include/asm/swiotlb.h     | 18 ------------------
 arch/ia64/kernel/dma-mapping.c      |  9 +++++++++
 arch/ia64/kernel/pci-dma.c          | 12 ++++++++++--
 arch/ia64/kernel/pci-swiotlb.c      | 36 ------------------------------------
 drivers/iommu/intel-iommu.c         |  2 +-
 6 files changed, 20 insertions(+), 58 deletions(-)
 delete mode 100644 arch/ia64/include/asm/swiotlb.h
 delete mode 100644 arch/ia64/kernel/pci-swiotlb.c

diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index eabee56d995c..76e4d6632d68 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h

@@ -8,7 +8,6 @@
  */
 #include <asm/machvec.h>
 #include <linux/scatterlist.h>
-#include <asm/swiotlb.h>
 #include <linux/dma-debug.h>
 
 #define ARCH_HAS_DMA_GET_REQUIRED_MASK

diff --git a/arch/ia64/include/asm/swiotlb.h b/arch/ia64/include/asm/swiotlb.h
deleted file mode 100644
index 841e2c7d0b21..000000000000
--- a/arch/ia64/include/asm/swiotlb.h
+++ /dev/null

@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ASM_IA64__SWIOTLB_H
-#define ASM_IA64__SWIOTLB_H
-
-#include <linux/dma-mapping.h>
-#include <linux/swiotlb.h>
-
-#ifdef CONFIG_SWIOTLB
-extern int swiotlb;
-extern void pci_swiotlb_init(void);
-#else
-#define swiotlb 0
-static inline void pci_swiotlb_init(void)
-{
-}
-#endif
-
-#endif /* ASM_IA64__SWIOTLB_H */

diff --git a/arch/ia64/kernel/dma-mapping.c b/arch/ia64/kernel/dma-mapping.c
index 7a82c9259609..f2d57e66fd86 100644
--- a/arch/ia64/kernel/dma-mapping.c
+++ b/arch/ia64/kernel/dma-mapping.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
 #include <linux/export.h>
 
 /* Set this to 1 if there is a HW IOMMU in the system */

@@ -23,3 +24,11 @@ const struct dma_map_ops *dma_get_ops(struct device *dev)
 	return dma_ops;
 }
 EXPORT_SYMBOL(dma_get_ops);
+
+#ifdef CONFIG_SWIOTLB
+void __init swiotlb_dma_init(void)
+{
+	dma_ops = &swiotlb_dma_ops;
+	swiotlb_init(1);
+}
+#endif

diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
index 3ba87c22dfbc..35e0cad33b7d 100644
--- a/arch/ia64/kernel/pci-dma.c
+++ b/arch/ia64/kernel/pci-dma.c

@@ -104,8 +104,16 @@ void __init pci_iommu_alloc(void)
 	detect_intel_iommu();
 
 #ifdef CONFIG_SWIOTLB
-	pci_swiotlb_init();
-#endif
+	if (!iommu_detected) {
+#ifdef CONFIG_IA64_GENERIC
+		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
+		machvec_init("dig");
+		swiotlb_dma_init();
+#else
+		panic("Unable to find Intel IOMMU");
+#endif /* CONFIG_IA64_GENERIC */
+	}
+#endif /* CONFIG_SWIOTLB */
 }
 
 #endif

diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
deleted file mode 100644
index 0f8d5fbd86bd..000000000000
--- a/arch/ia64/kernel/pci-swiotlb.c
+++ /dev/null

@@ -1,36 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Glue code to lib/swiotlb.c */
-
-#include <linux/pci.h>
-#include <linux/gfp.h>
-#include <linux/cache.h>
-#include <linux/module.h>
-#include <linux/dma-mapping.h>
-#include <linux/swiotlb.h>
-#include <asm/dma.h>
-#include <asm/iommu.h>
-#include <asm/machvec.h>
-
-int swiotlb __read_mostly;
-EXPORT_SYMBOL(swiotlb);
-
-void __init swiotlb_dma_init(void)
-{
-	dma_ops = &swiotlb_dma_ops;
-	swiotlb_init(1);
-}
-
-void __init pci_swiotlb_init(void)
-{
-	if (!iommu_detected) {
-#ifdef CONFIG_IA64_GENERIC
-		swiotlb = 1;
-		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
-		machvec_init("dig");
-		swiotlb_init(1);
-		dma_ops = &swiotlb_dma_ops;
-#else
-		panic("Unable to find Intel IOMMU");
-#endif
-	}
-}

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6c9df0773b78..569a9328e53e 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c

@@ -4807,7 +4807,7 @@ int __init intel_iommu_init(void)
 	up_write(&dmar_global_lock);
 	pr_info("Intel(R) Virtualization Technology for Directed I/O\n");
 
-#ifdef CONFIG_SWIOTLB
+#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
 	swiotlb = 0;
 #endif
 	dma_ops = &intel_dma_ops;

-- 
2.14.2

[PATCH 54/67] x86: remove sta2x11_dma_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:27:46

Both the swiotlb and the dma-direct code already call into phys_to_dma
to translate the DMA address.  So the sta2x11 into phys_to_dma and
dma_to_phys are enough to handle this "special" device, and we can use
the plain old swiotlb ops.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/device.h |  3 +++
 arch/x86/pci/sta2x11-fixup.c  | 46 +++++--------------------------------------
 2 files changed, 8 insertions(+), 41 deletions(-)

diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h
index 5e12c63b47aa..812bd6c5d602 100644
--- a/arch/x86/include/asm/device.h
+++ b/arch/x86/include/asm/device.h

@@ -6,6 +6,9 @@ struct dev_archdata {
 #if defined(CONFIG_INTEL_IOMMU) || defined(CONFIG_AMD_IOMMU)
 	void *iommu; /* hook for IOMMU specific extension */
 #endif
+#ifdef CONFIG_STA2X11
+	bool is_sta2x11 : 1;
+#endif
 };
 
 #if defined(CONFIG_X86_DEV_DMA_OPS) && defined(CONFIG_PCI_DOMAINS)

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 15ad3025e439..7a5bafb76d77 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c

@@ -159,43 +159,6 @@ static dma_addr_t a2p(dma_addr_t a, struct pci_dev *pdev)
 	return p;
 }
 
-/**
- * sta2x11_swiotlb_alloc_coherent - Allocate swiotlb bounce buffers
- *     returns virtual address. This is the only "special" function here.
- * @dev: PCI device
- * @size: Size of the buffer
- * @dma_handle: DMA address
- * @flags: memory flags
- */
-static void *sta2x11_swiotlb_alloc_coherent(struct device *dev,
-					    size_t size,
-					    dma_addr_t *dma_handle,
-					    gfp_t flags,
-					    unsigned long attrs)
-{
-	void *vaddr;
-
-	vaddr = swiotlb_alloc(dev, size, dma_handle, flags, attrs);
-	*dma_handle = p2a(*dma_handle, to_pci_dev(dev));
-	return vaddr;
-}
-
-/* We have our own dma_ops: the same as swiotlb but from alloc (above) */
-static const struct dma_map_ops sta2x11_dma_ops = {
-	.alloc = sta2x11_swiotlb_alloc_coherent,
-	.free = swiotlb_free,
-	.map_page = swiotlb_map_page,
-	.unmap_page = swiotlb_unmap_page,
-	.map_sg = swiotlb_map_sg_attrs,
-	.unmap_sg = swiotlb_unmap_sg_attrs,
-	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
-	.sync_single_for_device = swiotlb_sync_single_for_device,
-	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
-	.sync_sg_for_device = swiotlb_sync_sg_for_device,
-	.mapping_error = swiotlb_dma_mapping_error,
-	.dma_supported = dma_direct_supported,
-};
-
 /* At setup time, we use our own ops if the device is a ConneXt one */
 static void sta2x11_setup_pdev(struct pci_dev *pdev)
 {

@@ -205,7 +168,8 @@ static void sta2x11_setup_pdev(struct pci_dev *pdev)
 		return;
 	pci_set_consistent_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
 	pci_set_dma_mask(pdev, STA2X11_AMBA_SIZE - 1);
-	pdev->dev.dma_ops = &sta2x11_dma_ops;
+	pdev->dev.dma_ops = &swiotlb_dma_ops;
+	pdev->dev.archdata.is_sta2x11 = true;
 
 	/* We must enable all devices as master, for audio DMA to work */
 	pci_set_master(pdev);

@@ -225,7 +189,7 @@ bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
 	struct sta2x11_mapping *map;
 
-	if (dev->dma_ops != &sta2x11_dma_ops) {
+	if (!dev->archdata.is_sta2x11) {
 		if (!dev->dma_mask)
 			return false;
 		return addr + size - 1 <= *dev->dma_mask;

@@ -249,7 +213,7 @@ bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  */
 dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-	if (dev->dma_ops != &sta2x11_dma_ops)
+	if (!dev->archdata.is_sta2x11)
 		return paddr;
 	return p2a(paddr, to_pci_dev(dev));
 }

@@ -261,7 +225,7 @@ dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
  */
 phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-	if (dev->dma_ops != &sta2x11_dma_ops)
+	if (!dev->archdata.is_sta2x11)
 		return daddr;
 	return a2p(daddr, to_pci_dev(dev));
 }

-- 
2.14.2

[PATCH 51/67] set_memory.h: provide set_memory_{en,de}crypted stubs

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:28:19

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/set_memory.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index e5140648f638..da5178216da5 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h

@@ -17,4 +17,16 @@ static inline int set_memory_x(unsigned long addr,  int numpages) { return 0; }
 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
 #endif
 
+#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
+static inline int set_memory_encrypted(unsigned long addr, int numpages)
+{
+	return 0;
+}
+
+static inline int set_memory_decrypted(unsigned long addr, int numpages)
+{
+	return 0;
+}
+#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
+
 #endif /* _LINUX_SET_MEMORY_H_ */

-- 
2.14.2

[PATCH 49/67] swiotlb: refactor coherent buffer freeing

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:28:41

Factor out a new swiotlb_free_buffer helper that checks if an address
is allocated from the swiotlb bounce buffer, and if yes frees it.

This allows to simplify the swiotlb_free implemenation that uses
dma_direct_free to free the non-bounce buffer allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index a14fff30ee9d..adb4dd0091fa 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -773,22 +773,31 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 }
 EXPORT_SYMBOL(swiotlb_alloc_coherent);
 
+static bool swiotlb_free_buffer(struct device *dev, size_t size,
+		dma_addr_t dma_addr)
+{
+	phys_addr_t phys_addr = dma_to_phys(dev, dma_addr);
+
+	WARN_ON_ONCE(irqs_disabled());
+
+	if (!is_swiotlb_buffer(phys_addr))
+		return false;
+
+	/*
+	 * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single.
+	 * DMA_ATTR_SKIP_CPU_SYNC is optional.
+	 */
+	swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
+				 DMA_ATTR_SKIP_CPU_SYNC);
+	return true;
+}
+
 void
 swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
 		      dma_addr_t dev_addr)
 {
-	phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
-	WARN_ON(irqs_disabled());
-	if (!is_swiotlb_buffer(paddr))
+	if (!swiotlb_free_buffer(hwdev, size, dev_addr))
 		free_pages((unsigned long)vaddr, get_order(size));
-	else
-		/*
-		 * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single.
-		 * DMA_ATTR_SKIP_CPU_SYNC is optional.
-		 */
-		swiotlb_tbl_unmap_single(hwdev, paddr, size, DMA_TO_DEVICE,
-					 DMA_ATTR_SKIP_CPU_SYNC);
 }
 EXPORT_SYMBOL(swiotlb_free_coherent);

@@ -1103,9 +1112,7 @@ void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 void swiotlb_free(struct device *dev, size_t size, void *vaddr,
 		dma_addr_t dma_addr, unsigned long attrs)
 {
-	if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr)))
-		swiotlb_free_coherent(dev, size, vaddr, dma_addr);
-	else
+	if (!swiotlb_free_buffer(dev, size, dma_addr))
 		dma_direct_free(dev, size, vaddr, dma_addr, attrs);
 }

-- 
2.14.2

[PATCH 48/67] swiotlb: rely on dev->coherent_dma_mask

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:28:59

These days the coherent DMA mask is always set, so don't work around the
lack of it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/swiotlb.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index e0b8980334c3..a14fff30ee9d 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -716,15 +716,11 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	dma_addr_t dev_addr;
 	void *ret;
 	int order = get_order(size);
-	u64 dma_mask = DMA_BIT_MASK(32);
-
-	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = hwdev->coherent_dma_mask;
 
 	ret = (void *)__get_free_pages(flags, order);
 	if (ret) {
 		dev_addr = swiotlb_virt_to_bus(hwdev, ret);
-		if (dev_addr + size - 1 > dma_mask) {
+		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
 			/*
 			 * The allocated memory isn't reachable by the device.
 			 */

@@ -747,9 +743,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		dev_addr = swiotlb_phys_to_dma(hwdev, paddr);
 
 		/* Confirm address can be DMA'd by device */
-		if (dev_addr + size - 1 > dma_mask) {
+		if (dev_addr + size - 1 > hwdev->coherent_dma_mask) {
 			printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
-			       (unsigned long long)dma_mask,
+			       (unsigned long long)hwdev->coherent_dma_mask,
 			       (unsigned long long)dev_addr);
 
 			/*

-- 
2.14.2

[PATCH 45/67] swiotlb: rename swiotlb_free to swiotlb_exit

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:29:46

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/powerpc/kernel/dma-swiotlb.c | 2 +-
 arch/x86/kernel/pci-swiotlb.c     | 2 +-
 include/linux/swiotlb.h           | 4 ++--
 lib/swiotlb.c                     | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 506ac4fafac5..88f3963ca30f 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c

@@ -121,7 +121,7 @@ static int __init check_swiotlb_enabled(void)
 	if (ppc_swiotlb_enable)
 		swiotlb_print_info();
 	else
-		swiotlb_free();
+		swiotlb_exit();
 
 	return 0;
 }

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 7a11a3e4f697..57dea60c2473 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c

@@ -119,7 +119,7 @@ void __init pci_swiotlb_late_init(void)
 {
 	/* An IOMMU turned us off. */
 	if (!swiotlb)
-		swiotlb_free();
+		swiotlb_exit();
 	else {
 		printk(KERN_INFO "PCI-DMA: "
 		       "Using software bounce buffering for IO (SWIOTLB)\n");

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 24ed817082ee..606375e35d87 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h

@@ -115,10 +115,10 @@ extern int
 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 
 #ifdef CONFIG_SWIOTLB
-extern void __init swiotlb_free(void);
+extern void __init swiotlb_exit(void);
 unsigned int swiotlb_max_segment(void);
 #else
-static inline void swiotlb_free(void) { }
+static inline void swiotlb_exit(void) { }
 static inline unsigned int swiotlb_max_segment(void) { return 0; }
 #endif

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 6583f3512386..c1fcd3a32d07 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c

@@ -417,7 +417,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
 	return -ENOMEM;
 }
 
-void __init swiotlb_free(void)
+void __init swiotlb_exit(void)
 {
 	if (!io_tlb_orig_addr)
 		return;

-- 
2.14.2

[PATCH 41/67] x86: remove dma_alloc_coherent_gfp_flags

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:30:39

All dma_ops implementations used on x86 now take care of setting their own
required GFP_ masks for the allocation.  And given that the common code
now clears harmful flags itself that means we can stop the flags in all
the iommu implementations as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/dma-mapping.h | 11 -----------
 arch/x86/kernel/amd_gart_64.c      |  1 -
 arch/x86/kernel/pci-calgary_64.c   |  2 --
 arch/x86/kernel/pci-dma.c          |  2 --
 arch/x86/mm/mem_encrypt.c          |  7 -------
 drivers/iommu/amd_iommu.c          |  1 -
 drivers/iommu/intel-iommu.c        |  1 -
 7 files changed, 25 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index df9816b385eb..89ce4bfd241f 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h

@@ -36,15 +36,4 @@ int arch_dma_supported(struct device *dev, u64 mask);
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
 
-static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
-{
-	if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))
-		gfp |= GFP_DMA;
-#ifdef CONFIG_X86_64
-	if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
-		gfp |= GFP_DMA32;
-#endif
-       return gfp;
-}
-
 #endif

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 92054815023e..7466dd458e0f 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c

@@ -487,7 +487,6 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
 	if (!force_iommu || dev->coherent_dma_mask <= DMA_BIT_MASK(24))
 		return dma_direct_alloc(dev, size, dma_addr, flag, attrs);
 
-	flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 	page = alloc_pages(flag | __GFP_ZERO, get_order(size));
 	if (!page)
 		return NULL;

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index 5647853053bd..bbfc8b1e9104 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c

@@ -446,8 +446,6 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
 	npages = size >> PAGE_SHIFT;
 	order = get_order(size);
 
-	flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
-
 	/* alloc enough pages (and possibly more) */
 	ret = (void *)__get_free_pages(flag, order);
 	if (!ret)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index db0b88ea8d1b..14437116ffea 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -82,8 +82,6 @@ bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
 	if (!*dev)
 		*dev = &x86_dma_fallback_dev;
 
-	*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
-
 	if (!is_device_dma_capable(*dev))
 		return false;
 	return true;

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 479586b8ca9b..1c786e751b49 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c

@@ -208,13 +208,6 @@ static void *sev_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	void *vaddr = NULL;
 
 	order = get_order(size);
-
-	/*
-	 * Memory will be memset to zero after marking decrypted, so don't
-	 * bother clearing it before.
-	 */
-	gfp &= ~__GFP_ZERO;
-
 	page = alloc_pages_node(dev_to_node(dev), gfp, order);
 	if (page) {
 		dma_addr_t addr;

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index a2ad149ab0bf..51ce6db86fdd 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c

@@ -2600,7 +2600,6 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	dma_dom   = to_dma_ops_domain(domain);
 	size	  = PAGE_ALIGN(size);
 	dma_mask  = dev->coherent_dma_mask;
-	flag     &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 	flag     |= __GFP_ZERO;
 
 	page = alloc_pages(flag | __GFP_NOWARN,  get_order(size));

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0de8bfe89061..6c9df0773b78 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c

@@ -3718,7 +3718,6 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
 
 	size = PAGE_ALIGN(size);
 	order = get_order(size);
-	flags &= ~(GFP_DMA | GFP_DMA32);
 
 	if (gfpflags_allow_blocking(flags)) {
 		unsigned int count = size >> PAGE_SHIFT;

-- 
2.14.2

[PATCH 40/67] iommu/intel-iommu: use dma_direct_* helpers for the direct mapping case

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:30:59

This simplifies the code a bit, and prepares for future cleanups.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/iommu/Kconfig       |  1 +
 drivers/iommu/intel-iommu.c | 17 ++++++++---------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index dc7c1914645d..df171cb85822 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig

@@ -143,6 +143,7 @@ config DMAR_TABLE
 config INTEL_IOMMU
 	bool "Support for Intel IOMMU using DMA Remapping Devices"
 	depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC)
+	select DMA_DIRECT_OPS
 	select IOMMU_API
 	select IOMMU_IOVA
 	select DMAR_TABLE

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 921caf4f0c3e..0de8bfe89061 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c

@@ -31,6 +31,7 @@
 #include <linux/pci.h>
 #include <linux/dmar.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/mempool.h>
 #include <linux/memory.h>
 #include <linux/cpu.h>

@@ -3712,17 +3713,12 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
 	struct page *page = NULL;
 	int order;
 
+	if (iommu_no_mapping(dev))
+		return dma_direct_alloc(dev, size, dma_handle, flags, attrs);
+
 	size = PAGE_ALIGN(size);
 	order = get_order(size);
-
-	if (!iommu_no_mapping(dev))
-		flags &= ~(GFP_DMA | GFP_DMA32);
-	else if (dev->coherent_dma_mask < dma_get_required_mask(dev)) {
-		if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
-			flags |= GFP_DMA;
-		else
-			flags |= GFP_DMA32;
-	}
+	flags &= ~(GFP_DMA | GFP_DMA32);
 
 	if (gfpflags_allow_blocking(flags)) {
 		unsigned int count = size >> PAGE_SHIFT;

@@ -3758,6 +3754,9 @@ static void intel_free_coherent(struct device *dev, size_t size, void *vaddr,
 	int order;
 	struct page *page = virt_to_page(vaddr);
 
+	if (iommu_no_mapping(dev))
+		return dma_direct_free(dev, size, vaddr, dma_handle, attrs);
+
 	size = PAGE_ALIGN(size);
 	order = get_order(size);

-- 
2.14.2

[PATCH 37/67] x86: use dma-direct

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:31:47

The generic dma-direct implementation is now functionally equivalent to
the x86 nommu dma_map implementation, so switch over to using it.

Note that the various iommu drivers are switched from x86_dma_supported
to dma_direct_supported to provide identical functionality, although the
checks looks fairly questionable for at least some of them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/Kconfig                   |  1 +
 arch/x86/include/asm/dma-mapping.h |  8 -----
 arch/x86/include/asm/iommu.h       |  3 --
 arch/x86/kernel/Makefile           |  2 +-
 arch/x86/kernel/amd_gart_64.c      |  7 ++--
 arch/x86/kernel/pci-calgary_64.c   |  3 +-
 arch/x86/kernel/pci-dma.c          | 66 +-------------------------------------
 arch/x86/kernel/pci-swiotlb.c      |  5 ++-
 arch/x86/pci/sta2x11-fixup.c       |  2 +-
 drivers/iommu/amd_iommu.c          |  7 ++--
 drivers/iommu/intel-iommu.c        |  3 +-
 11 files changed, 17 insertions(+), 90 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f6f4328103c0..55ad01515075 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig

@@ -83,6 +83,7 @@ config X86
 	select CLOCKSOURCE_VALIDATE_LAST_CYCLE
 	select CLOCKSOURCE_WATCHDOG
 	select DCACHE_WORD_ACCESS
+	select DMA_DIRECT_OPS
 	select EDAC_ATOMIC_SCRUB
 	select EDAC_SUPPORT
 	select GENERIC_CLOCKEVENTS

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 545bf3721bc0..df9816b385eb 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h

@@ -36,14 +36,6 @@ int arch_dma_supported(struct device *dev, u64 mask);
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
 
-extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
-					dma_addr_t *dma_addr, gfp_t flag,
-					unsigned long attrs);
-
-extern void dma_generic_free_coherent(struct device *dev, size_t size,
-				      void *vaddr, dma_addr_t dma_addr,
-				      unsigned long attrs);
-
 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
 {
 	if (dev->coherent_dma_mask <= DMA_BIT_MASK(24))

diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
index 1e5d5d92eb40..baedab8ac538 100644
--- a/arch/x86/include/asm/iommu.h
+++ b/arch/x86/include/asm/iommu.h

@@ -2,13 +2,10 @@
 #ifndef _ASM_X86_IOMMU_H
 #define _ASM_X86_IOMMU_H
 
-extern const struct dma_map_ops nommu_dma_ops;
 extern int force_iommu, no_iommu;
 extern int iommu_detected;
 extern int iommu_pass_through;
 
-int x86_dma_supported(struct device *dev, u64 mask);
-
 /* 10 seconds */
 #define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 81bb565f4497..beee4332e69b 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile

@@ -54,7 +54,7 @@ obj-$(CONFIG_X86_ESPFIX64)	+= espfix_64.o
 obj-$(CONFIG_SYSFS)	+= ksysfs.o
 obj-y			+= bootflag.o e820.o
 obj-y			+= pci-dma.o quirks.o topology.o kdebugfs.o
-obj-y			+= alternative.o i8253.o pci-nommu.o hw_breakpoint.o
+obj-y			+= alternative.o i8253.o hw_breakpoint.o
 obj-y			+= tsc.o tsc_msr.o io_delay.o rtc.o
 obj-y			+= pci-iommu_table.o
 obj-y			+= resource.o

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index ecd486cb06ab..52e3abcf3e70 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c

@@ -501,8 +501,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
 		}
 		__free_pages(page, get_order(size));
 	} else
-		return dma_generic_alloc_coherent(dev, size, dma_addr, flag,
-						  attrs);
+		return dma_direct_alloc(dev, size, dma_addr, flag, attrs);
 
 	return NULL;
 }

@@ -513,7 +512,7 @@ gart_free_coherent(struct device *dev, size_t size, void *vaddr,
 		   dma_addr_t dma_addr, unsigned long attrs)
 {
 	gart_unmap_page(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0);
-	dma_generic_free_coherent(dev, size, vaddr, dma_addr, attrs);
+	dma_direct_free(dev, size, vaddr, dma_addr, attrs);
 }
 
 static int gart_mapping_error(struct device *dev, dma_addr_t dma_addr)

@@ -705,7 +704,7 @@ static const struct dma_map_ops gart_dma_ops = {
 	.alloc				= gart_alloc_coherent,
 	.free				= gart_free_coherent,
 	.mapping_error			= gart_mapping_error,
-	.dma_supported			= x86_dma_supported,
+	.dma_supported			= dma_direct_supported,
 };
 
 static void gart_iommu_shutdown(void)

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index 35c461f21815..5647853053bd 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c

@@ -33,6 +33,7 @@
 #include <linux/string.h>
 #include <linux/crash_dump.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/bitmap.h>
 #include <linux/pci_ids.h>
 #include <linux/pci.h>

@@ -493,7 +494,7 @@ static const struct dma_map_ops calgary_dma_ops = {
 	.map_page = calgary_map_page,
 	.unmap_page = calgary_unmap_page,
 	.mapping_error = calgary_mapping_error,
-	.dma_supported = x86_dma_supported,
+	.dma_supported = dma_direct_supported,
 };
 
 static inline void __iomem * busno_to_bbar(unsigned char num)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index b59820872ec7..db0b88ea8d1b 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -18,7 +18,7 @@
 
 static int forbid_dac __read_mostly;
 
-const struct dma_map_ops *dma_ops = &nommu_dma_ops;
+const struct dma_map_ops *dma_ops = &dma_direct_ops;
 EXPORT_SYMBOL(dma_ops);
 
 static int iommu_sac_force __read_mostly;

@@ -76,60 +76,6 @@ void __init pci_iommu_alloc(void)
 		}
 	}
 }
-void *dma_generic_alloc_coherent(struct device *dev, size_t size,
-				 dma_addr_t *dma_addr, gfp_t flag,
-				 unsigned long attrs)
-{
-	struct page *page;
-	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	dma_addr_t addr;
-
-again:
-	page = NULL;
-	/* CMA can be used only in the context which permits sleeping */
-	if (gfpflags_allow_blocking(flag)) {
-		page = dma_alloc_from_contiguous(dev, count, get_order(size),
-						 flag);
-		if (page) {
-			addr = phys_to_dma(dev, page_to_phys(page));
-			if (addr + size > dev->coherent_dma_mask) {
-				dma_release_from_contiguous(dev, page, count);
-				page = NULL;
-			}
-		}
-	}
-	/* fallback */
-	if (!page)
-		page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
-	if (!page)
-		return NULL;
-
-	addr = phys_to_dma(dev, page_to_phys(page));
-	if (addr + size > dev->coherent_dma_mask) {
-		__free_pages(page, get_order(size));
-
-		if (dev->coherent_dma_mask < DMA_BIT_MASK(32) &&
-		    !(flag & GFP_DMA)) {
-			flag = (flag & ~GFP_DMA32) | GFP_DMA;
-			goto again;
-		}
-
-		return NULL;
-	}
-	memset(page_address(page), 0, size);
-	*dma_addr = addr;
-	return page_address(page);
-}
-
-void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
-			       dma_addr_t dma_addr, unsigned long attrs)
-{
-	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	struct page *page = virt_to_page(vaddr);
-
-	if (!dma_release_from_contiguous(dev, page, count))
-		free_pages((unsigned long)vaddr, get_order(size));
-}
 
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
 {

@@ -243,16 +189,6 @@ int arch_dma_supported(struct device *dev, u64 mask)
 }
 EXPORT_SYMBOL(arch_dma_supported);
 
-int x86_dma_supported(struct device *dev, u64 mask)
-{
-	/* Copied from i386. Doesn't make much sense, because it will
-	   only work for pci_alloc_coherent.
-	   The caller just has to use GFP_DMA in this case. */
-	if (mask < DMA_BIT_MASK(24))
-		return 0;
-	return 1;
-}
-
 static int __init pci_iommu_init(void)
 {
 	struct iommu_table_entry *p;

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 9d3e35c33d94..7a11a3e4f697 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c

@@ -30,8 +30,7 @@ void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	 */
 	flags |= __GFP_NOWARN;
 
-	vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags,
-					   attrs);
+	vaddr = dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
 	if (vaddr)
 		return vaddr;

@@ -45,7 +44,7 @@ void x86_swiotlb_free_coherent(struct device *dev, size_t size,
 	if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr)))
 		swiotlb_free_coherent(dev, size, vaddr, dma_addr);
 	else
-		dma_generic_free_coherent(dev, size, vaddr, dma_addr, attrs);
+		dma_direct_free(dev, size, vaddr, dma_addr, attrs);
 }
 
 static const struct dma_map_ops swiotlb_dma_ops = {

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 75577c1490c4..6c712fe11bdc 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c

@@ -193,7 +193,7 @@ static const struct dma_map_ops sta2x11_dma_ops = {
 	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 	.sync_sg_for_device = swiotlb_sync_sg_for_device,
 	.mapping_error = swiotlb_dma_mapping_error,
-	.dma_supported = x86_dma_supported,
+	.dma_supported = dma_direct_supported,
 };
 
 /* At setup time, we use our own ops if the device is a ConneXt one */

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 7d5eb004091d..ea4734de5357 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c

@@ -28,6 +28,7 @@
 #include <linux/debugfs.h>
 #include <linux/scatterlist.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/iommu-helper.h>
 #include <linux/iommu.h>
 #include <linux/delay.h>

@@ -2182,7 +2183,7 @@ static int amd_iommu_add_device(struct device *dev)
 				dev_name(dev));
 
 		iommu_ignore_device(dev);
-		dev->dma_ops = &nommu_dma_ops;
+		dev->dma_ops = &dma_direct_ops;
 		goto out;
 	}
 	init_iommu_group(dev);

@@ -2667,7 +2668,7 @@ static void free_coherent(struct device *dev, size_t size,
  */
 static int amd_iommu_dma_supported(struct device *dev, u64 mask)
 {
-	if (!x86_dma_supported(dev, mask))
+	if (!dma_direct_supported(dev, mask))
 		return 0;
 	return check_device(dev);
 }

@@ -2781,7 +2782,7 @@ int __init amd_iommu_init_dma_ops(void)
 	 * continue to be SWIOTLB.
 	 */
 	if (!swiotlb)
-		dma_ops = &nommu_dma_ops;
+		dma_ops = &dma_direct_ops;
 
 	if (amd_iommu_unmap_flush)
 		pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4a2de34895ec..921caf4f0c3e 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c

@@ -45,6 +45,7 @@
 #include <linux/pci-ats.h>
 #include <linux/memblock.h>
 #include <linux/dma-contiguous.h>
+#include <linux/dma-direct.h>
 #include <linux/crash_dump.h>
 #include <asm/irq_remapping.h>
 #include <asm/cacheflush.h>

@@ -3872,7 +3873,7 @@ const struct dma_map_ops intel_dma_ops = {
 	.unmap_page = intel_unmap_page,
 	.mapping_error = intel_mapping_error,
 #ifdef CONFIG_X86
-	.dma_supported = x86_dma_supported,
+	.dma_supported = dma_direct_supported,
 #endif
 };

-- 
2.14.2

[PATCH 34/67] cris: use dma-direct

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:33:22

cris currently has an incomplete direct mapping dma_map_ops implementation
is PCI support is enabled.  Replace it with the fully feature generic
dma-direct implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/cris/Kconfig                       |  4 ++
 arch/cris/arch-v32/drivers/pci/Makefile |  2 +-
 arch/cris/arch-v32/drivers/pci/dma.c    | 78 ---------------------------------
 arch/cris/include/asm/Kbuild            |  1 +
 arch/cris/include/asm/dma-mapping.h     | 20 ---------
 5 files changed, 6 insertions(+), 99 deletions(-)
 delete mode 100644 arch/cris/arch-v32/drivers/pci/dma.c
 delete mode 100644 arch/cris/include/asm/dma-mapping.h

diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 54d3f426763b..cd5a0865c97f 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig

@@ -33,6 +33,9 @@ config GENERIC_CALIBRATE_DELAY
 config NO_IOPORT_MAP
 	def_bool y if !PCI
 
+config NO_DMA
+	def_bool y if !PCI
+
 config FORCE_MAX_ZONEORDER
 	int
 	default 6

@@ -72,6 +75,7 @@ config CRIS
 	select GENERIC_SCHED_CLOCK if ETRAX_ARCH_V32
 	select HAVE_DEBUG_BUGVERBOSE if ETRAX_ARCH_V32
 	select HAVE_NMI
+	select DMA_DIRECT_OPS if PCI
 
 config HZ
 	int

diff --git a/arch/cris/arch-v32/drivers/pci/Makefile b/arch/cris/arch-v32/drivers/pci/Makefile
index bff7482f2444..93c8be6170b1 100644
--- a/arch/cris/arch-v32/drivers/pci/Makefile
+++ b/arch/cris/arch-v32/drivers/pci/Makefile

@@ -2,4 +2,4 @@
 # Makefile for Etrax cardbus driver
 #
 
-obj-$(CONFIG_ETRAX_CARDBUS)        += bios.o dma.o
+obj-$(CONFIG_ETRAX_CARDBUS)        += bios.o

diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c
deleted file mode 100644
index c7e3056885d3..000000000000
--- a/arch/cris/arch-v32/drivers/pci/dma.c
+++ /dev/null

@@ -1,78 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Dynamic DMA mapping support.
- *
- * On cris there is no hardware dynamic DMA address translation,
- * so consistent alloc/free are merely page allocation/freeing.
- * The rest of the dynamic DMA mapping interface is implemented
- * in asm/pci.h.
- *
- * Borrowed from i386.
- */
-
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-#include <linux/gfp.h>
-#include <asm/io.h>
-
-static void *v32_dma_alloc(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
-{
-	void *ret;
-
-	if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
-		gfp |= GFP_DMA;
-
-	ret = (void *)__get_free_pages(gfp,  get_order(size));
-
-	if (ret != NULL) {
-		memset(ret, 0, size);
-		*dma_handle = virt_to_phys(ret);
-	}
-	return ret;
-}
-
-static void v32_dma_free(struct device *dev, size_t size, void *vaddr,
-		dma_addr_t dma_handle, unsigned long attrs)
-{
-	free_pages((unsigned long)vaddr, get_order(size));
-}
-
-static inline dma_addr_t v32_dma_map_page(struct device *dev,
-		struct page *page, unsigned long offset, size_t size,
-		enum dma_data_direction direction, unsigned long attrs)
-{
-	return page_to_phys(page) + offset;
-}
-
-static inline int v32_dma_map_sg(struct device *dev, struct scatterlist *sg,
-		int nents, enum dma_data_direction direction,
-		unsigned long attrs)
-{
-	printk("Map sg\n");
-	return nents;
-}
-
-static inline int v32_dma_supported(struct device *dev, u64 mask)
-{
-        /*
-         * we fall back to GFP_DMA when the mask isn't all 1s,
-         * so we can't guarantee allocations that must be
-         * within a tighter range than GFP_DMA..
-         */
-        if (mask < 0x00ffffff)
-                return 0;
-	return 1;
-}
-
-const struct dma_map_ops v32_dma_ops = {
-	.alloc			= v32_dma_alloc,
-	.free			= v32_dma_free,
-	.map_page		= v32_dma_map_page,
-	.map_sg                 = v32_dma_map_sg,
-	.dma_supported		= v32_dma_supported,
-	.is_phys		= true,
-};
-EXPORT_SYMBOL(v32_dma_ops);

diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
index 460349cb147f..8cf45ac30c1b 100644
--- a/arch/cris/include/asm/Kbuild
+++ b/arch/cris/include/asm/Kbuild

@@ -5,6 +5,7 @@ generic-y += cmpxchg.h
 generic-y += current.h
 generic-y += device.h
 generic-y += div64.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += exec.h
 generic-y += extable.h

diff --git a/arch/cris/include/asm/dma-mapping.h b/arch/cris/include/asm/dma-mapping.h
deleted file mode 100644
index 1553bdb30a0c..000000000000
--- a/arch/cris/include/asm/dma-mapping.h
+++ /dev/null

@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_CRIS_DMA_MAPPING_H
-#define _ASM_CRIS_DMA_MAPPING_H
-
-#ifdef CONFIG_PCI
-extern const struct dma_map_ops v32_dma_ops;
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	return &v32_dma_ops;
-}
-#else
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-	BUG();
-	return NULL;
-}
-#endif
-
-#endif

-- 
2.14.2

[PATCH 27/67] dma-direct: add dma address sanity checks

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:34:35

Roughly based on the x86 pci-nommu implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-direct.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index 0e087650e86b..ddd9dcf4e663 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -9,6 +9,24 @@
 #include <linux/scatterlist.h>
 #include <linux/pfn.h>
 
+#define DIRECT_MAPPING_ERROR		0
+
+static bool
+check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
+		const char *caller)
+{
+	if (unlikely(dev && !dma_capable(dev, dma_addr, size))) {
+		if (*dev->dma_mask >= DMA_BIT_MASK(32)) {
+			dev_err(dev,
+				"%s: overflow %llx+%zu of device mask %llx\n",
+				caller, (long long)dma_addr, size,
+				(long long)*dev->dma_mask);
+		}
+		return false;
+	}
+	return true;
+}
+
 static void *dma_direct_alloc(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {

@@ -31,7 +49,11 @@ static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
 		unsigned long offset, size_t size, enum dma_data_direction dir,
 		unsigned long attrs)
 {
-	return phys_to_dma(dev, page_to_phys(page)) + offset;
+	dma_addr_t dma_addr = phys_to_dma(dev, page_to_phys(page)) + offset;
+
+	if (!check_addr(dev, dma_addr, size, __func__))
+		return DIRECT_MAPPING_ERROR;
+	return dma_addr;
 }
 
 static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,

@@ -44,17 +66,25 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
 		BUG_ON(!sg_page(sg));
 
 		sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg));
+		if (!check_addr(dev, sg_dma_address(sg), sg->length, __func__))
+			return 0;
 		sg_dma_len(sg) = sg->length;
 	}
 
 	return nents;
 }
 
+static int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return dma_addr == DIRECT_MAPPING_ERROR;
+}
+
 const struct dma_map_ops dma_direct_ops = {
 	.alloc			= dma_direct_alloc,
 	.free			= dma_direct_free,
 	.map_page		= dma_direct_map_page,
 	.map_sg			= dma_direct_map_sg,
+	.mapping_error		= dma_direct_mapping_error,
 	.is_phys		= true,
 };
 EXPORT_SYMBOL(dma_direct_ops);

-- 
2.14.2

[PATCH 23/67] dma-mapping: add an arch_dma_supported hook

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:35:34

To implement the x86 forbid_dac and iommu_sac_force we want an arch hook
so that it can apply the global options across all dma_map_ops
implementations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/include/asm/dma-mapping.h |  3 +++
 arch/x86/kernel/pci-dma.c          | 19 ++++++++++++-------
 include/linux/dma-mapping.h        | 11 +++++++++++
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index dfdc9357a349..6277c83c0eb1 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h

@@ -30,6 +30,9 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return dma_ops;
 }
 
+int arch_dma_supported(struct device *dev, u64 mask);
+#define arch_dma_supported arch_dma_supported
+
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
 #define arch_dma_alloc_attrs arch_dma_alloc_attrs

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 61a8f1cb3829..df7ab02f959f 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c

@@ -215,7 +215,7 @@ static __init int iommu_setup(char *p)
 }
 early_param("iommu", iommu_setup);
 
-int x86_dma_supported(struct device *dev, u64 mask)
+int arch_dma_supported(struct device *dev, u64 mask)
 {
 #ifdef CONFIG_PCI
 	if (mask > 0xffffffff && forbid_dac > 0) {

@@ -224,12 +224,6 @@ int x86_dma_supported(struct device *dev, u64 mask)
 	}
 #endif
 
-	/* Copied from i386. Doesn't make much sense, because it will
-	   only work for pci_alloc_coherent.
-	   The caller just has to use GFP_DMA in this case. */
-	if (mask < DMA_BIT_MASK(24))
-		return 0;
-
 	/* Tell the device to use SAC when IOMMU force is on.  This
 	   allows the driver to use cheaper accesses in some cases.

@@ -249,6 +243,17 @@ int x86_dma_supported(struct device *dev, u64 mask)
 
 	return 1;
 }
+EXPORT_SYMBOL(arch_dma_supported);
+
+int x86_dma_supported(struct device *dev, u64 mask)
+{
+	/* Copied from i386. Doesn't make much sense, because it will
+	   only work for pci_alloc_coherent.
+	   The caller just has to use GFP_DMA in this case. */
+	if (mask < DMA_BIT_MASK(24))
+		return 0;
+	return 1;
+}
 
 static int __init pci_iommu_init(void)
 {

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index fd5197af882a..72568bf4fc12 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -583,6 +583,14 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 	return 0;
 }
 
+/*
+ * This is a hack for the legacy x86 forbid_dac and iommu_sac_force. Please
+ * don't use this is new code.
+ */
+#ifndef arch_dma_supported
+#define arch_dma_supported(dev, mask)	(1)
+#endif
+
 static inline void dma_check_mask(struct device *dev, u64 mask)
 {
 	if (sme_active() && (mask < (((u64)sme_get_me_mask() << 1) - 1)))

@@ -595,6 +603,9 @@ static inline int dma_supported(struct device *dev, u64 mask)
 
 	if (!ops)
 		return 0;
+	if (!arch_dma_supported(dev, mask))
+		return 0;
+
 	if (!ops->dma_supported)
 		return 1;
 	return ops->dma_supported(dev, mask);

-- 
2.14.2

[PATCH 21/67] dma-mapping: warn when there is no coherent_dma_mask

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:36:17

These days all devices should have a DMA coherent mask, and most dma_ops
implementations rely on that fact.  But just to be sure add an assert to
ring the warning bell if that is not the case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/dma-mapping.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e77e2dec4723..2779d544485c 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -520,6 +520,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 	void *cpu_addr;
 
 	BUG_ON(!ops);
+	WARN_ON_ONCE(!dev->coherent_dma_mask);
 
 	if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
 		return cpu_addr;

-- 
2.14.2

[PATCH 18/67] microblaze: remove dma_nommu_dma_supported

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:36:58

Always returning 1 is the same behavior as not supplying a method at all.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/microblaze/kernel/dma.c | 6 ------
 arch/parisc/kernel/pci-dma.c | 7 -------
 2 files changed, 13 deletions(-)

diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 364b0ac41452..49b09648679b 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c

@@ -89,11 +89,6 @@ static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
 	return nents;
 }
 
-static int dma_nommu_dma_supported(struct device *dev, u64 mask)
-{
-	return 1;
-}
-
 static inline dma_addr_t dma_nommu_map_page(struct device *dev,
 					     struct page *page,
 					     unsigned long offset,

@@ -209,7 +204,6 @@ const struct dma_map_ops dma_nommu_ops = {
 	.free			= dma_nommu_free_coherent,
 	.mmap			= dma_nommu_mmap_coherent,
 	.map_sg			= dma_nommu_map_sg,
-	.dma_supported		= dma_nommu_dma_supported,
 	.map_page		= dma_nommu_map_page,
 	.unmap_page		= dma_nommu_unmap_page,
 	.sync_single_for_cpu	= dma_nommu_sync_single_for_cpu,

diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index 6ad9aed3d025..2a05457f7aab 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c

@@ -75,11 +75,6 @@ void dump_resmap(void)
 static inline void dump_resmap(void) {;}
 #endif
 
-static int pa11_dma_supported( struct device *dev, u64 mask)
-{
-	return 1;
-}
-
 static inline int map_pte_uncached(pte_t * pte,
 		unsigned long vaddr,
 		unsigned long size, unsigned long *paddr_ptr)

@@ -579,7 +574,6 @@ static void pa11_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 }
 
 const struct dma_map_ops pcxl_dma_ops = {
-	.dma_supported =	pa11_dma_supported,
 	.alloc =		pa11_dma_alloc,
 	.free =			pa11_dma_free,
 	.map_page =		pa11_dma_map_page,

@@ -617,7 +611,6 @@ static void pcx_dma_free(struct device *dev, size_t size, void *vaddr,
 }
 
 const struct dma_map_ops pcx_dma_ops = {
-	.dma_supported =	pa11_dma_supported,
 	.alloc =		pcx_dma_alloc,
 	.free =			pcx_dma_free,
 	.map_page =		pa11_dma_map_page,

-- 
2.14.2

[PATCH 15/67] hexagon: use the generic dma_capable helper

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:37:33

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/hexagon/include/asm/dma-mapping.h | 7 -------
 arch/hexagon/kernel/dma.c              | 1 +
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
index 5208de242e79..263f6acbfb0f 100644
--- a/arch/hexagon/include/asm/dma-mapping.h
+++ b/arch/hexagon/include/asm/dma-mapping.h

@@ -37,11 +37,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return dma_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return 0;
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 #endif

diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 3683bb9c05a2..c1d24e37807c 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c

@@ -19,6 +19,7 @@
  */
 
 #include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
 #include <linux/bootmem.h>
 #include <linux/genalloc.h>
 #include <asm/dma-mapping.h>

-- 
2.14.2

[PATCH 12/67] s390: remove the unused dma_capable helper

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:38:36

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/s390/include/asm/dma-mapping.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index eaf490f9c5bc..2ec7240c1ada 100644
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h

@@ -16,11 +16,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &dma_noop_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return false;
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 #endif /* _ASM_S390_DMA_MAPPING_H */

-- 
2.14.2

[PATCH 10/67] m32r: remove the unused dma_capable helper

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:38:59

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/m32r/include/asm/dma-mapping.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/m32r/include/asm/dma-mapping.h b/arch/m32r/include/asm/dma-mapping.h
index 336ffe60814b..8967fb659691 100644
--- a/arch/m32r/include/asm/dma-mapping.h
+++ b/arch/m32r/include/asm/dma-mapping.h

@@ -14,11 +14,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 	return &dma_noop_ops;
 }
 
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
-	if (!dev->dma_mask)
-		return false;
-	return addr + size - 1 <= *dev->dma_mask;
-}
-
 #endif /* _ASM_M32R_DMA_MAPPING_H */

-- 
2.14.2

[PATCH 08/67] powerpc: remove unused flush_write_buffers definition

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:39:47

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/powerpc/include/asm/dma-mapping.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 5a6cbe11db6f..592c7f418aa0 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h

@@ -107,9 +107,6 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t off)
 		dev->archdata.dma_offset = off;
 }
 
-/* this will be removed soon */
-#define flush_write_buffers()
-
 #define HAVE_ARCH_DMA_SET_MASK 1
 extern int dma_set_mask(struct device *dev, u64 dma_mask);

-- 
2.14.2

[PATCH 05/67] dma-mapping: replace PCI_DMA_BUS_IS_PHYS with a flag in struct dma_map_ops

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:40:22

The current PCI_DMA_BUS_IS_PHYS decided if a dma implementation is bound
by the dma mask in the device because it directly maps to a physical
address range (modulo an offset in the device), or if it is virtualized
by an iommu and can map any address (that includes virtual iommus like
swiotlb).  The problem with this scheme is that it is per-architecture and
not per dma_ops instance, and we are growing more and more setups that
have multiple different dma operations in use on a single system, for
which this scheme can't provide a correct answer.  Depending on the
architecture that means we either get a false positive or false negative
at the moment.

This patch instead extents the is_phys flag in struct dma_map_ops that
is currently only used by a few architectures to be used tree wide.

Note that this means that we now need a struct device parent in the
Scsi_Host or netdevice.  Every modern driver has these, but there might
still be a few outdated legacy drivers out there, which now won't make
an intelligent decision.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/include/asm/pci.h          |  5 -----
 arch/alpha/kernel/pci-noop.c          |  1 +
 arch/arc/include/asm/pci.h            |  6 ------
 arch/arc/mm/dma.c                     |  1 +
 arch/arm/include/asm/pci.h            |  7 -------
 arch/arm/mm/dma-mapping-nommu.c       |  1 +
 arch/arm/mm/dma-mapping.c             |  2 ++
 arch/arm64/include/asm/pci.h          |  5 -----
 arch/blackfin/kernel/dma-mapping.c    |  2 ++
 arch/c6x/kernel/dma.c                 |  1 +
 arch/cris/arch-v32/drivers/pci/dma.c  |  1 +
 arch/cris/include/asm/pci.h           |  6 ------
 arch/frv/mb93090-mb00/pci-dma-nommu.c |  1 +
 arch/frv/mb93090-mb00/pci-dma.c       |  1 +
 arch/h8300/include/asm/pci.h          |  2 --
 arch/h8300/kernel/dma.c               |  1 +
 arch/hexagon/kernel/dma.c             |  2 +-
 arch/ia64/hp/common/sba_iommu.c       |  3 ---
 arch/ia64/include/asm/pci.h           | 17 -----------------
 arch/ia64/kernel/setup.c              | 12 ------------
 arch/ia64/sn/kernel/io_common.c       |  5 -----
 arch/m68k/include/asm/pci.h           |  6 ------
 arch/m68k/kernel/dma.c                |  1 +
 arch/metag/kernel/dma.c               |  1 +
 arch/microblaze/include/asm/pci.h     |  6 ------
 arch/microblaze/kernel/dma.c          |  1 +
 arch/mips/include/asm/pci.h           |  7 -------
 arch/mips/mm/dma-default.c            |  1 +
 arch/mn10300/include/asm/pci.h        |  6 ------
 arch/mn10300/mm/dma-alloc.c           |  1 +
 arch/nios2/mm/dma-mapping.c           |  1 +
 arch/openrisc/kernel/dma.c            |  1 +
 arch/parisc/include/asm/pci.h         | 23 -----------------------
 arch/parisc/kernel/pci-dma.c          |  2 ++
 arch/parisc/kernel/setup.c            |  5 -----
 arch/powerpc/include/asm/pci.h        | 18 ------------------
 arch/powerpc/kernel/dma.c             |  1 +
 arch/riscv/include/asm/pci.h          |  3 ---
 arch/s390/include/asm/pci.h           |  2 --
 arch/s390/pci/pci_dma.c               |  3 ---
 arch/sh/include/asm/pci.h             |  6 ------
 arch/sh/kernel/dma-nommu.c            |  2 +-
 arch/sparc/include/asm/pci_32.h       |  4 ----
 arch/sparc/include/asm/pci_64.h       |  6 ------
 arch/sparc/kernel/ioport.c            |  1 +
 arch/tile/include/asm/pci.h           | 14 --------------
 arch/tile/kernel/pci-dma.c            |  2 ++
 arch/x86/include/asm/pci.h            |  2 --
 arch/x86/kernel/pci-nommu.c           |  2 +-
 arch/xtensa/include/asm/pci.h         |  7 -------
 arch/xtensa/kernel/pci-dma.c          |  1 +
 drivers/ide/ide-lib.c                 |  5 ++---
 drivers/ide/ide-probe.c               |  2 +-
 drivers/parisc/ccio-dma.c             |  2 --
 drivers/parisc/sba_iommu.c            |  2 --
 drivers/pci/host/vmd.c                |  1 +
 drivers/scsi/scsi_lib.c               | 14 ++++++--------
 include/asm-generic/pci.h             |  8 --------
 include/linux/dma-mapping.h           | 23 ++++++++++++++++++++++-
 lib/dma-noop.c                        |  1 +
 net/core/dev.c                        | 18 ++++++++----------
 tools/virtio/linux/dma-mapping.h      |  2 --
 62 files changed, 70 insertions(+), 226 deletions(-)

diff --git a/arch/alpha/include/asm/pci.h b/arch/alpha/include/asm/pci.h
index b9ec55351924..cf6bc1e64d66 100644
--- a/arch/alpha/include/asm/pci.h
+++ b/arch/alpha/include/asm/pci.h

@@ -56,11 +56,6 @@ struct pci_controller {
 
 /* IOMMU controls.  */
 
-/* The PCI address space does not equal the physical memory address space.
-   The networking and block device layers use this boolean for bounce buffer
-   decisions.  */
-#define PCI_DMA_BUS_IS_PHYS  0
-
 /* TODO: integrate with include/asm-generic/pci.h ? */
 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 {

diff --git a/arch/alpha/kernel/pci-noop.c b/arch/alpha/kernel/pci-noop.c
index b995987b1557..d3208254b269 100644
--- a/arch/alpha/kernel/pci-noop.c
+++ b/arch/alpha/kernel/pci-noop.c

@@ -132,6 +132,7 @@ const struct dma_map_ops alpha_noop_ops = {
 	.map_sg			= dma_noop_map_sg,
 	.mapping_error		= dma_noop_mapping_error,
 	.dma_supported		= alpha_noop_supported,
+	.is_phys		= true,
 };
 
 const struct dma_map_ops *dma_ops = &alpha_noop_ops;

diff --git a/arch/arc/include/asm/pci.h b/arch/arc/include/asm/pci.h
index ba56c23c1b20..4ff53c041c64 100644
--- a/arch/arc/include/asm/pci.h
+++ b/arch/arc/include/asm/pci.h

@@ -16,12 +16,6 @@
 #define PCIBIOS_MIN_MEM 0x100000
 
 #define pcibios_assign_all_busses()	1
-/*
- * The PCI address space does equal the physical memory address space.
- * The networking and block device layers use this boolean for bounce
- * buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	1
 
 #endif /* __KERNEL__ */

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index e9d93604ad0f..fad18261ef6a 100644
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c

@@ -274,5 +274,6 @@ const struct dma_map_ops arc_dma_ops = {
 	.sync_sg_for_cpu	= arc_dma_sync_sg_for_cpu,
 	.sync_sg_for_device	= arc_dma_sync_sg_for_device,
 	.dma_supported		= arc_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(arc_dma_ops);

diff --git a/arch/arm/include/asm/pci.h b/arch/arm/include/asm/pci.h
index 960d9dc4f380..05b2eb2dc76f 100644
--- a/arch/arm/include/asm/pci.h
+++ b/arch/arm/include/asm/pci.h

@@ -22,13 +22,6 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 }
 #endif /* CONFIG_PCI_DOMAINS */
 
-/*
- * The PCI address space does equal the physical memory address space.
- * The networking and block device layers use this boolean for bounce
- * buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     (1)
-
 #define HAVE_PCI_MMAP
 #define ARCH_GENERIC_PCI_MMAP_RESOURCE

diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 6db5fc26d154..1cced700e45a 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c

@@ -208,6 +208,7 @@ const struct dma_map_ops arm_nommu_dma_ops = {
 	.sync_single_for_cpu	= arm_nommu_dma_sync_single_for_cpu,
 	.sync_sg_for_device	= arm_nommu_dma_sync_sg_for_device,
 	.sync_sg_for_cpu	= arm_nommu_dma_sync_sg_for_cpu,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(arm_nommu_dma_ops);

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index ada8eb206a90..8e120e2d9cac 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c

@@ -200,6 +200,7 @@ const struct dma_map_ops arm_dma_ops = {
 	.sync_sg_for_device	= arm_dma_sync_sg_for_device,
 	.mapping_error		= arm_dma_mapping_error,
 	.dma_supported		= arm_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(arm_dma_ops);

@@ -220,6 +221,7 @@ const struct dma_map_ops arm_coherent_dma_ops = {
 	.map_sg			= arm_dma_map_sg,
 	.mapping_error		= arm_dma_mapping_error,
 	.dma_supported		= arm_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(arm_coherent_dma_ops);

diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index 8747f7c5e0e7..9e690686e8aa 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h

@@ -18,11 +18,6 @@
 #define pcibios_assign_all_busses() \
 	(pci_has_flag(PCI_REASSIGN_ALL_BUS))
 
-/*
- * PCI address space differs from physical memory address space
- */
-#define PCI_DMA_BUS_IS_PHYS	(0)
-
 #define ARCH_GENERIC_PCI_MMAP_RESOURCE	1
 
 extern int isa_dma_bridge_buggy;

diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 477bb29a7987..362902a2a418 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c

@@ -168,5 +168,7 @@ const struct dma_map_ops bfin_dma_ops = {
 
 	.sync_single_for_device	= bfin_dma_sync_single_for_device,
 	.sync_sg_for_device	= bfin_dma_sync_sg_for_device,
+
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(bfin_dma_ops);

diff --git a/arch/c6x/kernel/dma.c b/arch/c6x/kernel/dma.c
index 9fff8be75f58..a526dddeeac1 100644
--- a/arch/c6x/kernel/dma.c
+++ b/arch/c6x/kernel/dma.c

@@ -134,6 +134,7 @@ const struct dma_map_ops c6x_dma_ops = {
 	.sync_single_for_cpu	= c6x_dma_sync_single_for_cpu,
 	.sync_sg_for_device	= c6x_dma_sync_sg_for_device,
 	.sync_sg_for_cpu	= c6x_dma_sync_sg_for_cpu,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(c6x_dma_ops);

diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c
index dbbd3816cc0b..aa16ce27e036 100644
--- a/arch/cris/arch-v32/drivers/pci/dma.c
+++ b/arch/cris/arch-v32/drivers/pci/dma.c

@@ -76,5 +76,6 @@ const struct dma_map_ops v32_dma_ops = {
 	.map_page		= v32_dma_map_page,
 	.map_sg                 = v32_dma_map_sg,
 	.dma_supported		= v32_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(v32_dma_ops);

diff --git a/arch/cris/include/asm/pci.h b/arch/cris/include/asm/pci.h
index dcfef6407ae6..eb1f7f172f4b 100644
--- a/arch/cris/include/asm/pci.h
+++ b/arch/cris/include/asm/pci.h

@@ -27,12 +27,6 @@
 #include <linux/string.h>
 #include <asm/io.h>
 
-/* The PCI address space does equal the physical memory
- * address space.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(1)
-
 #define HAVE_PCI_MMAP
 #define ARCH_GENERIC_PCI_MMAP_RESOURCE

diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c
index 4a96de7f0af4..d58d701619e5 100644
--- a/arch/frv/mb93090-mb00/pci-dma-nommu.c
+++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c

@@ -172,5 +172,6 @@ const struct dma_map_ops frv_dma_ops = {
 	.sync_single_for_device	= frv_dma_sync_single_for_device,
 	.sync_sg_for_device	= frv_dma_sync_sg_for_device,
 	.dma_supported		= frv_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(frv_dma_ops);

diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c
index e7130abc0dae..8c2e9a40e57e 100644
--- a/arch/frv/mb93090-mb00/pci-dma.c
+++ b/arch/frv/mb93090-mb00/pci-dma.c

@@ -114,5 +114,6 @@ const struct dma_map_ops frv_dma_ops = {
 	.sync_single_for_device	= frv_dma_sync_single_for_device,
 	.sync_sg_for_device	= frv_dma_sync_sg_for_device,
 	.dma_supported		= frv_dma_supported,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(frv_dma_ops);

diff --git a/arch/h8300/include/asm/pci.h b/arch/h8300/include/asm/pci.h
index 7c9e55d62215..d4d345a52092 100644
--- a/arch/h8300/include/asm/pci.h
+++ b/arch/h8300/include/asm/pci.h

@@ -15,6 +15,4 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
 	/* We don't do dynamic PCI IRQ allocation */
 }
 
-#define PCI_DMA_BUS_IS_PHYS	(1)
-
 #endif /* _ASM_H8300_PCI_H */

diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c
index 225dd0a188dc..0e92214310c4 100644
--- a/arch/h8300/kernel/dma.c
+++ b/arch/h8300/kernel/dma.c

@@ -65,5 +65,6 @@ const struct dma_map_ops h8300_dma_map_ops = {
 	.free = dma_free,
 	.map_page = map_page,
 	.map_sg = map_sg,
+	.is_phys = true,
 };
 EXPORT_SYMBOL(h8300_dma_map_ops);

diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 546792d176a4..3683bb9c05a2 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c

@@ -207,7 +207,7 @@ const struct dma_map_ops hexagon_dma_ops = {
 	.sync_single_for_cpu = hexagon_sync_single_for_cpu,
 	.sync_single_for_device = hexagon_sync_single_for_device,
 	.mapping_error	= hexagon_mapping_error,
-	.is_phys	= 1,
+	.is_phys	= true,
 };
 
 void __init hexagon_dma_init(void)

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index aec4a3354abe..6f05aba9012f 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c

@@ -1845,9 +1845,6 @@ static void ioc_init(unsigned long hpa, struct ioc *ioc)
 	ioc_resource_init(ioc);
 	ioc_sac_init(ioc);
 
-	if ((long) ~iovp_mask > (long) ia64_max_iommu_merge_mask)
-		ia64_max_iommu_merge_mask = ~iovp_mask;
-
 	printk(KERN_INFO PFX
 		"%s %d.%d HPA 0x%lx IOVA space %dMb at 0x%lx\n",
 		ioc->name, (ioc->rev >> 4) & 0xF, ioc->rev & 0xF,

diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
index b1d04e8bafc8..780e8744ba85 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h

@@ -30,23 +30,6 @@ struct pci_vector_struct {
 #define PCIBIOS_MIN_IO		0x1000
 #define PCIBIOS_MIN_MEM		0x10000000
 
-/*
- * PCI_DMA_BUS_IS_PHYS should be set to 1 if there is _necessarily_ a direct
- * correspondence between device bus addresses and CPU physical addresses.
- * Platforms with a hardware I/O MMU _must_ turn this off to suppress the
- * bounce buffer handling code in the block and network device layers.
- * Platforms with separate bus address spaces _must_ turn this off and provide
- * a device DMA mapping implementation that takes care of the necessary
- * address translation.
- *
- * For now, the ia64 platforms which may have separate/multiple bus address
- * spaces all have I/O MMUs which support the merging of physically
- * discontiguous buffers, so we can use that as the sole factor to determine
- * the setting of PCI_DMA_BUS_IS_PHYS.
- */
-extern unsigned long ia64_max_iommu_merge_mask;
-#define PCI_DMA_BUS_IS_PHYS	(ia64_max_iommu_merge_mask == ~0UL)
-
 #define HAVE_PCI_MMAP
 #define ARCH_GENERIC_PCI_MMAP_RESOURCE
 #define arch_can_pci_mmap_wc()	1

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index dee56bcb993d..ad43cbf70628 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c

@@ -123,18 +123,6 @@ unsigned long ia64_i_cache_stride_shift = ~0;
 #define	CACHE_STRIDE_SHIFT	5
 unsigned long ia64_cache_stride_shift = ~0;
 
-/*
- * The merge_mask variable needs to be set to (max(iommu_page_size(iommu)) - 1).  This
- * mask specifies a mask of address bits that must be 0 in order for two buffers to be
- * mergeable by the I/O MMU (i.e., the end address of the first buffer and the start
- * address of the second buffer must be aligned to (merge_mask+1) in order to be
- * mergeable).  By default, we assume there is no I/O MMU which can merge physically
- * discontiguous buffers, so we set the merge_mask to ~0UL, which corresponds to a iommu
- * page-size of 2^64.
- */
-unsigned long ia64_max_iommu_merge_mask = ~0UL;
-EXPORT_SYMBOL(ia64_max_iommu_merge_mask);
-
 /*
  * We use a special marker for the end of memory and it uses the extra (+1) slot
  */

diff --git a/arch/ia64/sn/kernel/io_common.c b/arch/ia64/sn/kernel/io_common.c
index 11f2275570fb..8479e9a7ce16 100644
--- a/arch/ia64/sn/kernel/io_common.c
+++ b/arch/ia64/sn/kernel/io_common.c

@@ -480,11 +480,6 @@ sn_io_early_init(void)
 	tioca_init_provider();
 	tioce_init_provider();
 
-	/*
-	 * This is needed to avoid bounce limit checks in the blk layer
-	 */
-	ia64_max_iommu_merge_mask = ~PAGE_MASK;
-
 	sn_irq_lh_init();
 	INIT_LIST_HEAD(&sn_sysdata_list);
 	sn_init_cpei_timer();

diff --git a/arch/m68k/include/asm/pci.h b/arch/m68k/include/asm/pci.h
index ef26fae8cf0b..5a4bc223743b 100644
--- a/arch/m68k/include/asm/pci.h
+++ b/arch/m68k/include/asm/pci.h

@@ -4,12 +4,6 @@
 
 #include <asm-generic/pci.h>
 
-/* The PCI address space does equal the physical memory
- * address space.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(1)
-
 #define	pcibios_assign_all_busses()	1
 
 #define	PCIBIOS_MIN_IO		0x00000100

diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
index 87ef73a93856..e0167418072b 100644
--- a/arch/m68k/kernel/dma.c
+++ b/arch/m68k/kernel/dma.c

@@ -165,5 +165,6 @@ const struct dma_map_ops m68k_dma_ops = {
 	.map_sg			= m68k_dma_map_sg,
 	.sync_single_for_device	= m68k_dma_sync_single_for_device,
 	.sync_sg_for_device	= m68k_dma_sync_sg_for_device,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(m68k_dma_ops);

diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
index f0ab3a498328..16cb4df51b8a 100644
--- a/arch/metag/kernel/dma.c
+++ b/arch/metag/kernel/dma.c

@@ -584,5 +584,6 @@ const struct dma_map_ops metag_dma_ops = {
 	.sync_single_for_cpu	= metag_dma_sync_single_for_cpu,
 	.sync_sg_for_cpu	= metag_dma_sync_sg_for_cpu,
 	.mmap			= metag_dma_mmap,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(metag_dma_ops);

diff --git a/arch/microblaze/include/asm/pci.h b/arch/microblaze/include/asm/pci.h
index 114b93488193..00478965f932 100644
--- a/arch/microblaze/include/asm/pci.h
+++ b/arch/microblaze/include/asm/pci.h

@@ -61,12 +61,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
 
 #define HAVE_PCI_LEGACY	1
 
-/* The PCI address space does equal the physical memory
- * address space (no IOMMU).  The IDE and SCSI device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     (1)
-
 extern void pcibios_claim_one_bus(struct pci_bus *b);
 
 extern void pcibios_finish_adding_to_bus(struct pci_bus *bus);

diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 990bf9ea0ec6..2a9a0ec14c46 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c

@@ -216,6 +216,7 @@ const struct dma_map_ops dma_direct_ops = {
 	.sync_single_for_device		= dma_direct_sync_single_for_device,
 	.sync_sg_for_cpu		= dma_direct_sync_sg_for_cpu,
 	.sync_sg_for_device		= dma_direct_sync_sg_for_device,
+	.is_phys	= true,
 };
 EXPORT_SYMBOL(dma_direct_ops);

diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
index 2339f42f047a..436099883022 100644
--- a/arch/mips/include/asm/pci.h
+++ b/arch/mips/include/asm/pci.h

@@ -121,13 +121,6 @@ extern unsigned long PCIBIOS_MIN_MEM;
 #include <linux/string.h>
 #include <asm/io.h>
 
-/*
- * The PCI address space does equal the physical memory address space.
- * The networking and block device layers use this boolean for bounce
- * buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     (1)
-
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
 static inline int pci_proc_domain(struct pci_bus *bus)
 {

diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index e3e94d05f0fd..3cd93e0c7a29 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c

@@ -407,6 +407,7 @@ static const struct dma_map_ops mips_default_dma_map_ops = {
 	.mapping_error = mips_dma_mapping_error,
 	.dma_supported = mips_dma_supported,
 	.cache_sync = mips_dma_cache_sync,
+	.is_phys = true,
 };
 
 const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;

diff --git a/arch/mn10300/include/asm/pci.h b/arch/mn10300/include/asm/pci.h
index 5b75a1b2c4f6..6132966bdf30 100644
--- a/arch/mn10300/include/asm/pci.h
+++ b/arch/mn10300/include/asm/pci.h

@@ -57,12 +57,6 @@ extern void unit_pci_init(void);
 #include <linux/string.h>
 #include <asm/io.h>
 
-/* The PCI address space does equal the physical memory
- * address space.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(1)
-
 /* Return the index of the PCI controller for device. */
 static inline int pci_controller_num(struct pci_dev *dev)
 {

diff --git a/arch/mn10300/mm/dma-alloc.c b/arch/mn10300/mm/dma-alloc.c
index 86108d2496b3..55876a87c247 100644
--- a/arch/mn10300/mm/dma-alloc.c
+++ b/arch/mn10300/mm/dma-alloc.c

@@ -128,4 +128,5 @@ const struct dma_map_ops mn10300_dma_ops = {
 	.map_sg			= mn10300_dma_map_sg,
 	.sync_single_for_device	= mn10300_dma_sync_single_for_device,
 	.sync_sg_for_device	= mn10300_dma_sync_sg_for_device,
+	.is_phys		= true,
 };

diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index 7040c1adbb5e..599bcc09c9e7 100644
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c

@@ -203,5 +203,6 @@ const struct dma_map_ops nios2_dma_ops = {
 	.sync_single_for_cpu	= nios2_dma_sync_single_for_cpu,
 	.sync_sg_for_cpu	= nios2_dma_sync_sg_for_cpu,
 	.sync_sg_for_device	= nios2_dma_sync_sg_for_device,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(nios2_dma_ops);

diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index a945f00011b4..7faad429d3dc 100644
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c

@@ -245,6 +245,7 @@ const struct dma_map_ops or1k_dma_map_ops = {
 	.unmap_sg = or1k_unmap_sg,
 	.sync_single_for_cpu = or1k_sync_single_for_cpu,
 	.sync_single_for_device = or1k_sync_single_for_device,
+	.is_phys = true,
 };
 EXPORT_SYMBOL(or1k_dma_map_ops);

diff --git a/arch/parisc/include/asm/pci.h b/arch/parisc/include/asm/pci.h
index 96b7deec512d..3328fd17c19d 100644
--- a/arch/parisc/include/asm/pci.h
+++ b/arch/parisc/include/asm/pci.h

@@ -87,29 +87,6 @@ struct pci_hba_data {
 #define PCI_F_EXTEND		0UL
 #endif /* !CONFIG_64BIT */
 
-/*
- * If the PCI device's view of memory is the same as the CPU's view of memory,
- * PCI_DMA_BUS_IS_PHYS is true.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#ifdef CONFIG_PA20
-/* All PA-2.0 machines have an IOMMU. */
-#define PCI_DMA_BUS_IS_PHYS	0
-#define parisc_has_iommu()	do { } while (0)
-#else
-
-#if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
-extern int parisc_bus_is_phys; 	/* in arch/parisc/kernel/setup.c */
-#define PCI_DMA_BUS_IS_PHYS	parisc_bus_is_phys
-#define parisc_has_iommu()	do { parisc_bus_is_phys = 0; } while (0)
-#else
-#define PCI_DMA_BUS_IS_PHYS	1
-#define parisc_has_iommu()	do { } while (0)
-#endif
-
-#endif	/* !CONFIG_PA20 */
-
-
 /*
 ** Most PCI devices (eg Tulip, NCR720) also export the same registers
 ** to both MMIO and I/O port space.  Due to poor performance of I/O Port

diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index c0dfd892f70c..6ad9aed3d025 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c

@@ -591,6 +591,7 @@ const struct dma_map_ops pcxl_dma_ops = {
 	.sync_sg_for_cpu =	pa11_dma_sync_sg_for_cpu,
 	.sync_sg_for_device =	pa11_dma_sync_sg_for_device,
 	.cache_sync =		pa11_dma_cache_sync,
+	.is_phys =		true,
 };
 
 static void *pcx_dma_alloc(struct device *dev, size_t size,

@@ -628,4 +629,5 @@ const struct dma_map_ops pcx_dma_ops = {
 	.sync_sg_for_cpu =	pa11_dma_sync_sg_for_cpu,
 	.sync_sg_for_device =	pa11_dma_sync_sg_for_device,
 	.cache_sync =		pa11_dma_cache_sync,
+	.is_phys =		true,
 };

diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index 0e9675f857a5..8d3a7b80ac42 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c

@@ -58,11 +58,6 @@ struct proc_dir_entry * proc_runway_root __read_mostly = NULL;
 struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
 struct proc_dir_entry * proc_mckinley_root __read_mostly = NULL;
 
-#if !defined(CONFIG_PA20) && (defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA))
-int parisc_bus_is_phys __read_mostly = 1;	/* Assume no IOMMU is present */
-EXPORT_SYMBOL(parisc_bus_is_phys);
-#endif
-
 void __init setup_cmdline(char **cmdline_p)
 {
 	extern unsigned int boot_args[];

diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h
index 8dc32eacc97c..04c1347e2c51 100644
--- a/arch/powerpc/include/asm/pci.h
+++ b/arch/powerpc/include/asm/pci.h

@@ -91,24 +91,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
 
 #define HAVE_PCI_LEGACY	1
 
-#ifdef CONFIG_PPC64
-
-/* The PCI address space does not equal the physical memory address
- * space (we have an IOMMU).  The IDE and SCSI device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(0)
-
-#else /* 32-bit */
-
-/* The PCI address space does equal the physical memory
- * address space (no IOMMU).  The IDE and SCSI device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     (1)
-
-#endif /* CONFIG_PPC64 */
-
 extern void pcibios_claim_one_bus(struct pci_bus *b);
 
 extern void pcibios_finish_adding_to_bus(struct pci_bus *bus);

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 4194bbbbdb10..df0e7bb97ab5 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c

@@ -290,6 +290,7 @@ const struct dma_map_ops dma_direct_ops = {
 	.sync_sg_for_cpu 		= dma_direct_sync_sg,
 	.sync_sg_for_device 		= dma_direct_sync_sg,
 #endif
+	.is_phys			= true,
 };
 EXPORT_SYMBOL(dma_direct_ops);

diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
index 0f2fc9ef20fc..b3638c505728 100644
--- a/arch/riscv/include/asm/pci.h
+++ b/arch/riscv/include/asm/pci.h

@@ -26,9 +26,6 @@
 /* RISC-V shim does not initialize PCI bus */
 #define pcibios_assign_all_busses() 1
 
-/* We do not have an IOMMU */
-#define PCI_DMA_BUS_IS_PHYS 1
-
 extern int isa_dma_bridge_buggy;
 
 #ifdef CONFIG_PCI

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 12fe3591034f..94f8db468c9b 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h

@@ -2,8 +2,6 @@
 #ifndef __ASM_S390_PCI_H
 #define __ASM_S390_PCI_H
 
-/* must be set before including asm-generic/pci.h */
-#define PCI_DMA_BUS_IS_PHYS (0)
 /* must be set before including pci_clp.h */
 #define PCI_BAR_COUNT	6

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index f7aa5a77827e..90826e2010da 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c

@@ -668,9 +668,6 @@ const struct dma_map_ops s390_pci_dma_ops = {
 	.map_page	= s390_dma_map_pages,
 	.unmap_page	= s390_dma_unmap_pages,
 	.mapping_error	= s390_mapping_error,
-	/* if we support direct DMA this must be conditional */
-	.is_phys	= 0,
-	/* dma_supported is unconditionally true without a callback */
 };
 EXPORT_SYMBOL_GPL(s390_pci_dma_ops);

diff --git a/arch/sh/include/asm/pci.h b/arch/sh/include/asm/pci.h
index 0033f0df2b3b..10a36b1cf2ea 100644
--- a/arch/sh/include/asm/pci.h
+++ b/arch/sh/include/asm/pci.h

@@ -71,12 +71,6 @@ extern unsigned long PCIBIOS_MIN_IO, PCIBIOS_MIN_MEM;
  * SuperH has everything mapped statically like x86.
  */
 
-/* The PCI address space does equal the physical memory
- * address space.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(dma_ops->is_phys)
-
 #ifdef CONFIG_PCI
 /*
  * None of the SH PCI controllers support MWI, it is always treated as a

diff --git a/arch/sh/kernel/dma-nommu.c b/arch/sh/kernel/dma-nommu.c
index 62b485107eae..a2ef7f19610d 100644
--- a/arch/sh/kernel/dma-nommu.c
+++ b/arch/sh/kernel/dma-nommu.c

@@ -75,7 +75,7 @@ const struct dma_map_ops nommu_dma_ops = {
 	.sync_single_for_device	= nommu_sync_single_for_device,
 	.sync_sg_for_device	= nommu_sync_sg_for_device,
 #endif
-	.is_phys		= 1,
+	.is_phys		= true,
 };
 
 void __init no_iommu_init(void)

diff --git a/arch/sparc/include/asm/pci_32.h b/arch/sparc/include/asm/pci_32.h
index 98917e48727d..cfc0ee9476c6 100644
--- a/arch/sparc/include/asm/pci_32.h
+++ b/arch/sparc/include/asm/pci_32.h

@@ -17,10 +17,6 @@
 
 #define PCI_IRQ_NONE		0xffffffff
 
-/* Dynamic DMA mapping stuff.
- */
-#define PCI_DMA_BUS_IS_PHYS	(0)
-
 #endif /* __KERNEL__ */
 
 #ifndef CONFIG_LEON_PCI

diff --git a/arch/sparc/include/asm/pci_64.h b/arch/sparc/include/asm/pci_64.h
index 671274e36cfa..fac77813402c 100644
--- a/arch/sparc/include/asm/pci_64.h
+++ b/arch/sparc/include/asm/pci_64.h

@@ -17,12 +17,6 @@
 
 #define PCI_IRQ_NONE		0xffffffff
 
-/* The PCI address space does not equal the physical memory
- * address space.  The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS	(0)
-
 /* PCI IOMMU mapping bypass support. */
 
 /* PCI 64-bit addressing works for all slots on all controller

diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 7eeef80c02f7..a401e8e0579d 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c

@@ -656,6 +656,7 @@ const struct dma_map_ops pci32_dma_ops = {
 	.sync_single_for_device	= pci32_sync_single_for_device,
 	.sync_sg_for_cpu	= pci32_sync_sg_for_cpu,
 	.sync_sg_for_device	= pci32_sync_sg_for_device,
+	.is_phys		= true,
 };
 EXPORT_SYMBOL(pci32_dma_ops);

diff --git a/arch/tile/include/asm/pci.h b/arch/tile/include/asm/pci.h
index fe3de505b024..8b910e3f0620 100644
--- a/arch/tile/include/asm/pci.h
+++ b/arch/tile/include/asm/pci.h

@@ -52,13 +52,6 @@ static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {}
 
 #define	TILE_NUM_PCIE	2
 
-/*
- * The hypervisor maps the entirety of CPA-space as bus addresses, so
- * bus addresses are physical addresses.  The networking and block
- * device layers use this boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     1
-
 /* generic pci stuff */
 #include <asm-generic/pci.h>

@@ -185,13 +178,6 @@ extern int num_trio_shims;
 
 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 
-/*
- * The PCI address space does not equal the physical memory address
- * space (we have an IOMMU). The IDE and SCSI device layers use this
- * boolean for bounce buffer decisions.
- */
-#define PCI_DMA_BUS_IS_PHYS     0
-
 #endif /* __tilegx__ */
 
 int __init tile_pci_init(void);

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index f2abedc8a080..9072e2c25e59 100644
--- a/arch/tile/kernel/pci-dma.c
+++ b/arch/tile/kernel/pci-dma.c

@@ -328,6 +328,7 @@ static const struct dma_map_ops tile_default_dma_map_ops = {
 	.sync_single_for_device = tile_dma_sync_single_for_device,
 	.sync_sg_for_cpu = tile_dma_sync_sg_for_cpu,
 	.sync_sg_for_device = tile_dma_sync_sg_for_device,
+	.is_phys = true,
 };
 
 const struct dma_map_ops *tile_dma_map_ops = &tile_default_dma_map_ops;

@@ -501,6 +502,7 @@ static const struct dma_map_ops tile_pci_default_dma_map_ops = {
 	.sync_single_for_device = tile_pci_dma_sync_single_for_device,
 	.sync_sg_for_cpu = tile_pci_dma_sync_sg_for_cpu,
 	.sync_sg_for_device = tile_pci_dma_sync_sg_for_device,
+	.is_phys = true,
 };
 
 const struct dma_map_ops *gx_pci_dma_map_ops = &tile_pci_default_dma_map_ops;

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index d32175e30259..fecde74ff549 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h

@@ -118,8 +118,6 @@ void native_restore_msi_irqs(struct pci_dev *dev);
 #define native_teardown_msi_irq		NULL
 #endif
 
-#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
-
 #endif  /* __KERNEL__ */
 
 #ifdef CONFIG_X86_64

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index c78df78b5ccd..8ac9d1fe0373 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c

@@ -84,7 +84,7 @@ const struct dma_map_ops nommu_dma_ops = {
 	.free			= dma_generic_free_coherent,
 	.map_sg			= nommu_map_sg,
 	.map_page		= nommu_map_page,
-	.is_phys		= 1,
 	.mapping_error		= nommu_mapping_error,
 	.dma_supported		= x86_dma_supported,
+	.is_phys		= true,
 };

diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h
index 5c83798e3b2e..7949349294c7 100644
--- a/arch/xtensa/include/asm/pci.h
+++ b/arch/xtensa/include/asm/pci.h

@@ -37,13 +37,6 @@ extern struct pci_controller* pcibios_alloc_controller(void);
 #include <linux/string.h>
 #include <asm/io.h>
 
-/* The PCI address space does equal the physical memory address space.
- * The networking and block device layers use this boolean for bounce buffer
- * decisions.
- */
-
-#define PCI_DMA_BUS_IS_PHYS	(1)
-
 /* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
 #define HAVE_PCI_MMAP		1
 #define arch_can_pci_mmap_io()	1

diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c
index 623720a11143..4a51996d2919 100644
--- a/arch/xtensa/kernel/pci-dma.c
+++ b/arch/xtensa/kernel/pci-dma.c

@@ -239,6 +239,7 @@ const struct dma_map_ops xtensa_dma_map_ops = {
 	.sync_sg_for_cpu = xtensa_sync_sg_for_cpu,
 	.sync_sg_for_device = xtensa_sync_sg_for_device,
 	.mapping_error = xtensa_dma_mapping_error,
+	.is_phys = true,
 };
 EXPORT_SYMBOL(xtensa_dma_map_ops);

diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index e1180fa46196..0cdd661ddee0 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c

@@ -17,13 +17,12 @@
 
 void ide_toggle_bounce(ide_drive_t *drive, int on)
 {
+	struct device *dev = drive->hwif ? drive->hwif->dev : NULL;
 	u64 addr = BLK_BOUNCE_HIGH;	/* dma64_addr_t */
 
-	if (!PCI_DMA_BUS_IS_PHYS) {
+	if (dev && !dma_is_phys(dev)) {
 		addr = BLK_BOUNCE_ANY;
 	} else if (on && drive->media == ide_disk) {
-		struct device *dev = drive->hwif->dev;
-
 		if (dev && dev->dma_mask)
 			addr = *dev->dma_mask;
 	}

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 17fd55af4d92..7fe4d751e6cf 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c

@@ -796,7 +796,7 @@ static int ide_init_queue(ide_drive_t *drive)
 	 * This will be fixed once we teach pci_map_sg() about our boundary
 	 * requirements, hopefully soon. *FIXME*
 	 */
-	if (!PCI_DMA_BUS_IS_PHYS)
+	if (hwif->dev && !dma_is_phys(hwif->dev))
 		max_sg_entries >>= 1;
 #endif /* CONFIG_PCI */

diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index acba1f56af3e..2b129d8525d5 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c

@@ -1596,8 +1596,6 @@ static int __init ccio_probe(struct parisc_device *dev)
 	}
 #endif
 	ioc_count++;
-
-	parisc_has_iommu();
 	return 0;
 }

diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 0a9c762a70fa..a58c586ebd81 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c

@@ -2017,8 +2017,6 @@ static int __init sba_driver_callback(struct parisc_device *dev)
 	proc_create("sba_iommu", 0, root, &sba_proc_fops);
 	proc_create("sba_iommu-bitmap", 0, root, &sba_proc_bitmap_fops);
 #endif
-
-	parisc_has_iommu();
 	return 0;
 }

diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
index 509893bc3e63..5bb03ad9ed21 100644
--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c

@@ -428,6 +428,7 @@ static void vmd_setup_dma_ops(struct vmd_dev *vmd)
 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 	ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
 #endif
+	dest->is_phys = source->is_phys;
 	add_dma_domain(domain);
 }
 #undef ASSIGN_VMD_DMA_OPS

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index d9ca1dfab154..2644214a92ca 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c

@@ -2105,16 +2105,14 @@ static u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost)
 
 	if (shost->unchecked_isa_dma)
 		return BLK_BOUNCE_ISA;
-	/*
-	 * Platforms with virtual-DMA translation
-	 * hardware have no practical limit.
-	 */
-	if (!PCI_DMA_BUS_IS_PHYS)
-		return BLK_BOUNCE_ANY;
 
 	host_dev = scsi_get_device(shost);
-	if (host_dev && host_dev->dma_mask)
-		bounce_limit = (u64)dma_max_pfn(host_dev) << PAGE_SHIFT;
+	if (host_dev) {
+		if (!dma_is_phys(host_dev))
+			return BLK_BOUNCE_ANY;
+		if (host_dev->dma_mask)
+			bounce_limit = (u64)dma_max_pfn(host_dev) << PAGE_SHIFT;
+	}
 
 	return bounce_limit;
 }

diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
index 830d7659289b..6bb3cd3d695a 100644
--- a/include/asm-generic/pci.h
+++ b/include/asm-generic/pci.h

@@ -14,12 +14,4 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 }
 #endif /* HAVE_ARCH_PCI_GET_LEGACY_IDE_IRQ */
 
-/*
- * By default, assume that no iommu is in use and that the PCI
- * space is mapped to address physical 0.
- */
-#ifndef PCI_DMA_BUS_IS_PHYS
-#define PCI_DMA_BUS_IS_PHYS	(1)
-#endif
-
 #endif /* _ASM_GENERIC_PCI_H */

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index d84951865be7..e77e2dec4723 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h

@@ -133,7 +133,14 @@ struct dma_map_ops {
 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 	u64 (*get_required_mask)(struct device *dev);
 #endif
-	int is_phys;
+
+	/*
+	 * If is_phys is true, the dma_map_ops implementation only does a
+	 * linear mapping from physical to DMA address, and can only address
+	 * memory up to dma_max_pfn().  If is_phys is false DMA is possible
+	 * to any physical address.
+	 */
+	bool is_phys;
 };
 
 extern const struct dma_map_ops dma_noop_ops;

@@ -689,6 +696,20 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 	return -EIO;
 }
 
+#ifdef CONFIG_HAS_DMA
+static inline bool dma_is_phys(struct device *dev)
+{
+	const struct dma_map_ops *ops = get_dma_ops(dev);
+
+	return ops && ops->is_phys;
+}
+#else
+static inline bool dma_is_phys(struct device *dev)
+{
+	return false;
+}
+#endif
+
 #ifndef dma_max_pfn
 static inline unsigned long dma_max_pfn(struct device *dev)
 {

diff --git a/lib/dma-noop.c b/lib/dma-noop.c
index a10185b0c2d4..c3728a0551f5 100644
--- a/lib/dma-noop.c
+++ b/lib/dma-noop.c

@@ -63,6 +63,7 @@ const struct dma_map_ops dma_noop_ops = {
 	.free			= dma_noop_free,
 	.map_page		= dma_noop_map_page,
 	.map_sg			= dma_noop_map_sg,
+	.is_phys		= true,
 };
 
 EXPORT_SYMBOL(dma_noop_ops);

diff --git a/net/core/dev.c b/net/core/dev.c
index 01ee854454a8..ddf45f9217d4 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c

@@ -2830,6 +2830,7 @@ EXPORT_SYMBOL(netdev_rx_csum_fault);
 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 {
 #ifdef CONFIG_HIGHMEM
+	struct device *pdev = dev->dev.parent;
 	int i;
 
 	if (!(dev->features & NETIF_F_HIGHDMA)) {

@@ -2841,18 +2842,15 @@ static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 		}
 	}
 
-	if (PCI_DMA_BUS_IS_PHYS) {
-		struct device *pdev = dev->dev.parent;
+	if (!pdev || !dma_is_phys(pdev))
+		return 0;
 
-		if (!pdev)
-			return 0;
-		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-			dma_addr_t addr = page_to_phys(skb_frag_page(frag));
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+		dma_addr_t addr = page_to_phys(skb_frag_page(frag));
 
-			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
-				return 1;
-		}
+		if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
+			return 1;
 	}
 #endif
 	return 0;

diff --git a/tools/virtio/linux/dma-mapping.h b/tools/virtio/linux/dma-mapping.h
index 1571e24e9494..f91aeb5fe571 100644
--- a/tools/virtio/linux/dma-mapping.h
+++ b/tools/virtio/linux/dma-mapping.h

@@ -6,8 +6,6 @@
 # error Virtio userspace code does not support CONFIG_HAS_DMA
 #endif
 
-#define PCI_DMA_BUS_IS_PHYS 1
-
 enum dma_data_direction {
 	DMA_BIDIRECTIONAL = 0,
 	DMA_TO_DEVICE = 1,

-- 
2.14.2

[PATCH 01/67] x86: remove X86_PPRO_FENCE

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-29 08:41:04

There were only a few Pentium Pro multiprocessors systems where this
errata applied. They are more than 20 years old now, and we've slowly
dropped places where put the workarounds in and discuraged anyone
from enabling the workaround.

Get rid of it for good.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/Kconfig.cpu                        | 13 -------------
 arch/x86/entry/vdso/vdso32/vclock_gettime.c |  2 --
 arch/x86/include/asm/barrier.h              | 30 -----------------------------
 arch/x86/include/asm/io.h                   | 15 ---------------
 arch/x86/kernel/pci-nommu.c                 | 19 ------------------
 arch/x86/um/asm/barrier.h                   |  4 ----
 6 files changed, 83 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 65a9a4716e34..f0c5ef578153 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu

@@ -315,19 +315,6 @@ config X86_L1_CACHE_SHIFT
 	default "4" if MELAN || M486 || MGEODEGX1
 	default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 
-config X86_PPRO_FENCE
-	bool "PentiumPro memory ordering errata workaround"
-	depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
-	---help---
-	  Old PentiumPro multiprocessor systems had errata that could cause
-	  memory operations to violate the x86 ordering standard in rare cases.
-	  Enabling this option will attempt to work around some (but not all)
-	  occurrences of this problem, at the cost of much heavier spinlock and
-	  memory barrier operations.
-
-	  If unsure, say n here. Even distro kernels should think twice before
-	  enabling this: there are few systems, and an unlikely bug.
-
 config X86_F00F_BUG
 	def_bool y
 	depends on M586MMX || M586TSC || M586 || M486

diff --git a/arch/x86/entry/vdso/vdso32/vclock_gettime.c b/arch/x86/entry/vdso/vdso32/vclock_gettime.c
index 7780bbfb06ef..9242b28418d5 100644
--- a/arch/x86/entry/vdso/vdso32/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vdso32/vclock_gettime.c

@@ -5,8 +5,6 @@
 #undef CONFIG_OPTIMIZE_INLINING
 #endif
 
-#undef CONFIG_X86_PPRO_FENCE
-
 #ifdef CONFIG_X86_64
 
 /*

diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index 7fb336210e1b..aa0f7449d4a4 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h

@@ -24,11 +24,7 @@
 #define wmb()	asm volatile("sfence" ::: "memory")
 #endif
 
-#ifdef CONFIG_X86_PPRO_FENCE
-#define dma_rmb()	rmb()
-#else
 #define dma_rmb()	barrier()
-#endif
 #define dma_wmb()	barrier()
 
 #ifdef CONFIG_X86_32

@@ -40,30 +36,6 @@
 #define __smp_wmb()	barrier()
 #define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
 
-#if defined(CONFIG_X86_PPRO_FENCE)
-
-/*
- * For this option x86 doesn't have a strong TSO memory
- * model and we should fall back to full barriers.
- */
-
-#define __smp_store_release(p, v)					\
-do {									\
-	compiletime_assert_atomic_type(*p);				\
-	__smp_mb();							\
-	WRITE_ONCE(*p, v);						\
-} while (0)
-
-#define __smp_load_acquire(p)						\
-({									\
-	typeof(*p) ___p1 = READ_ONCE(*p);				\
-	compiletime_assert_atomic_type(*p);				\
-	__smp_mb();							\
-	___p1;								\
-})
-
-#else /* regular x86 TSO memory ordering */
-
 #define __smp_store_release(p, v)					\
 do {									\
 	compiletime_assert_atomic_type(*p);				\

@@ -79,8 +51,6 @@ do {									\
 	___p1;								\
 })
 
-#endif
-
 /* Atomic operations are already serializing on x86 */
 #define __smp_mb__before_atomic()	barrier()
 #define __smp_mb__after_atomic()	barrier()

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 95e948627fd0..f6e5b9375d8c 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h

@@ -232,21 +232,6 @@ extern void set_iounmap_nonlazy(void);
  */
 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 
-/*
- *	Cache management
- *
- *	This needed for two cases
- *	1. Out of order aware processors
- *	2. Accidentally out of order processors (PPro errata #51)
- */
-
-static inline void flush_write_buffers(void)
-{
-#if defined(CONFIG_X86_PPRO_FENCE)
-	asm volatile("lock; addl $0,0(%%esp)": : :"memory");
-#endif
-}
-
 #endif /* __KERNEL__ */
 
 extern void native_io_delay(void);

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index b0caae27e1b7..c78df78b5ccd 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c

@@ -37,7 +37,6 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
 	WARN_ON(size == 0);
 	if (!check_addr("map_single", dev, bus, size))
 		return NOMMU_MAPPING_ERROR;
-	flush_write_buffers();
 	return bus;
 }

@@ -72,25 +71,9 @@ static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
 			return 0;
 		s->dma_length = s->length;
 	}
-	flush_write_buffers();
 	return nents;
 }
 
-static void nommu_sync_single_for_device(struct device *dev,
-			dma_addr_t addr, size_t size,
-			enum dma_data_direction dir)
-{
-	flush_write_buffers();
-}
-
-
-static void nommu_sync_sg_for_device(struct device *dev,
-			struct scatterlist *sg, int nelems,
-			enum dma_data_direction dir)
-{
-	flush_write_buffers();
-}
-
 static int nommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 	return dma_addr == NOMMU_MAPPING_ERROR;

@@ -101,8 +84,6 @@ const struct dma_map_ops nommu_dma_ops = {
 	.free			= dma_generic_free_coherent,
 	.map_sg			= nommu_map_sg,
 	.map_page		= nommu_map_page,
-	.sync_single_for_device = nommu_sync_single_for_device,
-	.sync_sg_for_device	= nommu_sync_sg_for_device,
 	.is_phys		= 1,
 	.mapping_error		= nommu_mapping_error,
 	.dma_supported		= x86_dma_supported,

diff --git a/arch/x86/um/asm/barrier.h b/arch/x86/um/asm/barrier.h
index b7d73400ea29..f31e5d903161 100644
--- a/arch/x86/um/asm/barrier.h
+++ b/arch/x86/um/asm/barrier.h

@@ -30,11 +30,7 @@
 
 #endif /* CONFIG_X86_32 */
 
-#ifdef CONFIG_X86_PPRO_FENCE
-#define dma_rmb()	rmb()
-#else /* CONFIG_X86_PPRO_FENCE */
 #define dma_rmb()	barrier()
-#endif /* CONFIG_X86_PPRO_FENCE */
 #define dma_wmb()	barrier()
 
 #include <asm-generic/barrier.h>

-- 
2.14.2

Re: [PATCH 17/67] microblaze: rename dma_direct to dma_microblaze

From: Julian Calaby <hidden>
Date: 2017-12-29 10:12:24

Hi Christoph,

On Fri, Dec 29, 2017 at 7:18 PM, Christoph Hellwig [off-list ref] wrote:

This frees the dma_direct_* namespace for a generic implementation.

Don't you mean "dma_nommu" not "dma_microblaze" in the subject line?

Thanks,

-- 
Julian Calaby

Email: julian.calaby@gmail.com
Profile: http://www.google.com/profiles/julian.calaby/

Re: consolidate direct dma mapping and swiotlb support

From: Vladimir Murzin <hidden>
Date: 2017-12-29 10:52:29

On 29/12/17 08:18, Christoph Hellwig wrote:

Almost every architecture supports a direct dma mapping implementation,
where no iommu is used and the device dma address is a 1:1 mapping to
the physical address or has a simple linear offset.  Currently the
code for this implementation is most duplicated over the architectures,
and the duplicated again in the swiotlb code, and then duplicated again
for special cases like the x86 memory encryption DMA ops.

This series takes the existing very simple dma-noop dma mapping
implementation, enhances it with all the x86 features and quirks, and
creates a common set of architecture hooks for it and the swiotlb code.

It then switches a large number of architectures to this generic
direct map implement and the new generic swiotlb dma_map ops.

Note that for now this only handles architectures that do cache coherent
DMA, but a similar consolidation for non-coherent architectures is in the
work for later merge windows.

Is it available in your dma-mapping.git or somewhere else?

Cheers
Vladimir

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 27/67] dma-direct: add dma address sanity checks

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2017-12-29 14:12:32

Hi Christoph,

On Fri, Dec 29, 2017 at 9:18 AM, Christoph Hellwig [off-list ref] wrote:

Roughly based on the x86 pci-nommu implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Thanks for your patch!

quoted hunk

--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -9,6 +9,24 @@
 #include <linux/scatterlist.h>
 #include <linux/pfn.h>

+#define DIRECT_MAPPING_ERROR           0
+
+static bool
+check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
+               const char *caller)
+{
+       if (unlikely(dev && !dma_capable(dev, dma_addr, size))) {
+               if (*dev->dma_mask >= DMA_BIT_MASK(32)) {
+                       dev_err(dev,
+                               "%s: overflow %llx+%zu of device mask %llx\n",

Please use "%pad" to format dma_addr_t ...

+                               caller, (long long)dma_addr, size,

... and use &dma_addr.

+                               (long long)*dev->dma_mask);

This cast is not needed, as u64 is unsigned long long in kernelspace on
all architectures.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: consolidate direct dma mapping and swiotlb support

From: Christoph Hellwig <hch@lst.de>
Date: 2017-12-30 10:56:46

On Fri, Dec 29, 2017 at 10:52:14AM +0000, Vladimir Murzin wrote:

Is it available in your dma-mapping.git or somewhere else?

  git://git.infradead.org/users/hch/misc.git dma-direct

Gitweb:

  http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-direct

Re: [PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_

From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2018-01-02 09:45:38

Christoph Hellwig [off-list ref] writes:

We want to use the dma_direct_ namespace for a generic implementation,
so rename powerpc to the second best choice: dma_nommu_.

I'm not a fan of "nommu". Some of the users of direct ops *are* using an
IOMMU, they're just setting up a 1:1 mapping once at init time, rather
than mapping dynamically.

Though I don't have a good idea for a better name, maybe "1to1",
"linear", "premapped" ?

cheers

Re: [PATCH 16/67] powerpc: rename dma_direct_ to dma_nommu_

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2018-01-02 10:22:44

On Tue, Jan 2, 2018 at 10:45 AM, Michael Ellerman [off-list ref] wrote:

Christoph Hellwig [off-list ref] writes:

quoted

We want to use the dma_direct_ namespace for a generic implementation,
so rename powerpc to the second best choice: dma_nommu_.

I'm not a fan of "nommu". Some of the users of direct ops *are* using an
IOMMU, they're just setting up a 1:1 mapping once at init time, rather
than mapping dynamically.

Though I don't have a good idea for a better name, maybe "1to1",
"linear", "premapped" ?

"identity"?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 29/67] dma-direct: use node local allocations for coherent memory

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: 2018-01-02 10:29:16

Missing patch description explaining why this change is desirable.

On Fri, Dec 29, 2017 at 9:18 AM, Christoph Hellwig [off-list ref] wrote:

quoted hunk

--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c

@@ -39,7 +39,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size,
        if (gfpflags_allow_blocking(gfp))
                page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
        if (!page)
-               page = alloc_pages(gfp, page_order);
+               page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
        if (!page)
                return NULL;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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