[PATCH 5/5] dma-mapping: consolidate dma_set_mask

Christoph Hellwig
2015-08-13T15:04:08Z

Almost everyone implements dma_set_mask the same way, although some time
that's hidden in ->set_dma_mask methods.

Move this implementation to common code, including a callout to override
the post-check action, and remove duplicate instaces in methods as well.

Unfortunately some architectures overload unrelated semantics like changing
the dma_ops into it so we still need to allow for an architecture override
for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/alpha/include/asm/dma-mapping.h | 5 -----
arch/alpha/kernel/pci-noop.c | 10 ----------
arch/alpha/kernel/pci_iommu.c | 11 -----------
arch/arm/common/dmabounce.c | 9 ---------
arch/arm/include/asm/dma-mapping.h | 5 -----
arch/arm/mm/dma-mapping.c | 16 ----------------
arch/arm/xen/mm.c | 1 -
arch/arm64/include/asm/dma-mapping.h | 9 ---------
arch/h8300/include/asm/dma-mapping.h | 5 -----
arch/hexagon/include/asm/dma-mapping.h | 1 -
arch/hexagon/kernel/dma.c | 11 -----------
arch/ia64/include/asm/dma-mapping.h | 9 ---------
arch/microblaze/include/asm/dma-mapping.h | 14 --------------
arch/mips/include/asm/dma-mapping.h | 16 ----------------
arch/openrisc/include/asm/dma-mapping.h | 9 ---------
arch/powerpc/include/asm/dma-mapping.h | 4 +++-
arch/powerpc/platforms/cell/iommu.c | 3 ---
arch/s390/include/asm/dma-mapping.h | 2 --
arch/s390/pci/pci_dma.c | 10 ----------
arch/sh/include/asm/dma-mapping.h | 14 --------------
arch/sparc/include/asm/dma-mapping.h | 5 +++--
arch/tile/include/asm/dma-mapping.h | 5 +++--
arch/unicore32/include/asm/dma-mapping.h | 10 ----------
arch/x86/include/asm/dma-mapping.h | 2 --
arch/x86/kernel/pci-dma.c | 11 -----------
drivers/xen/swiotlb-xen.c | 12 ------------
include/asm-generic/dma-mapping-common.h | 16 ++++++++++++++++
include/xen/swiotlb-xen.h | 2 --
28 files changed, 25 insertions(+), 202 deletions(-)

diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
index 9d763e5..72a8ca7 100644
--- a/arch/alpha/include/asm/dma-mapping.h
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -12,11 +12,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)

#include <asm-generic/dma-mapping-common.h>

-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
- return get_dma_ops(dev)->set_dma_mask(dev, mask);
-}
-
#define dma_cache_sync(dev, va, size, dir) ((void)0)

#endif /* _ALPHA_DMA_MAPPING_H */
diff --git a/arch/alpha/kernel/pci-noop.c b/arch/alpha/kernel/pci-noop.c
index df24b76..2b1f4a1 100644
--- a/arch/alpha/kernel/pci-noop.c
+++ b/arch/alpha/kernel/pci-noop.c
@@ -166,15 +166,6 @@ static int alpha_noop_supported(struct device *dev, u64 mask)
return mask < 0x00ffffffUL ? 0 : 1;
}

-static int alpha_noop_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
-
- *dev->dma_mask = mask;
- return 0;
-}
-
struct dma_map_ops alpha_noop_ops = {
.alloc = alpha_noop_alloc_coherent,
.free = alpha_noop_free_coherent,
@@ -182,7 +173,6 @@ struct dma_map_ops alpha_noop_ops = {
.map_sg = alpha_noop_map_sg,
.mapping_error = alpha_noop_mapping_error,
.dma_supported = alpha_noop_supported,
- .set_dma_mask = alpha_noop_set_mask,
};

struct dma_map_ops *dma_ops = &alpha_noop_ops;
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index eddee77..8969bf2 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -939,16 +939,6 @@ static int alpha_pci_mapping_error(struct device *dev, dma_addr_t dma_addr)
return dma_addr == 0;
}

-static int alpha_pci_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask ||
- !pci_dma_supported(alpha_gendev_to_pci(dev), mask))
- return -EIO;
-
- *dev->dma_mask = mask;
- return 0;
-}
-
struct dma_map_ops alpha_pci_ops = {
.alloc = alpha_pci_alloc_coherent,
.free = alpha_pci_free_coherent,
@@ -958,7 +948,6 @@ struct dma_map_ops alpha_pci_ops = {
.unmap_sg = alpha_pci_unmap_sg,
.mapping_error = alpha_pci_mapping_error,
.dma_supported = alpha_pci_supported,
- .set_dma_mask = alpha_pci_set_mask,
};

struct dma_map_ops *dma_ops = &alpha_pci_ops;
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 1143c4d..260f52a 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -440,14 +440,6 @@ static void dmabounce_sync_for_device(struct device *dev,
arm_dma_ops.sync_single_for_device(dev, handle, size, dir);
}

-static int dmabounce_set_mask(struct device *dev, u64 dma_mask)
-{
- if (dev->archdata.dmabounce)
- return 0;
-
- return arm_dma_ops.set_dma_mask(dev, dma_mask);
-}
-
static struct dma_map_ops dmabounce_ops = {
.alloc = arm_dma_alloc,
.free = arm_dma_free,
@@ -461,7 +453,6 @@ static struct dma_map_ops dmabounce_ops = {
.unmap_sg = arm_dma_unmap_sg,
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device,
- .set_dma_mask = dmabounce_set_mask,
};

static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev,
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index b90d247..5f4262ea 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -43,11 +43,6 @@ extern int dma_supported(struct device *dev, u64 mask);

#include <asm-generic/dma-mapping-common.h>

-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
- return get_dma_ops(dev)->set_dma_mask(dev, mask);
-}
-
#ifdef __arch_page_to_dma
#error Please update to __arch_pfn_to_dma
#endif
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index e556e0e..00b1e75 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -140,7 +140,6 @@ struct dma_map_ops arm_dma_ops = {
.sync_single_for_device = arm_dma_sync_single_for_device,
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device,
- .set_dma_mask = arm_dma_set_mask,
};
EXPORT_SYMBOL(arm_dma_ops);

@@ -159,7 +158,6 @@ struct dma_map_ops arm_coherent_dma_ops = {
.get_sgtable = arm_dma_get_sgtable,
.map_page = arm_coherent_dma_map_page,
.map_sg = arm_dma_map_sg,
- .set_dma_mask = arm_dma_set_mask,
};
EXPORT_SYMBOL(arm_coherent_dma_ops);

@@ -1001,16 +999,6 @@ int dma_supported(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(dma_supported);

-int arm_dma_set_mask(struct device *dev, u64 dma_mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
-
- *dev->dma_mask = dma_mask;
-
- return 0;
-}
-
#define PREALLOC_DMA_DEBUG_ENTRIES 4096

static int __init dma_debug_do_init(void)
@@ -1852,8 +1840,6 @@ struct dma_map_ops iommu_ops = {
.unmap_sg = arm_iommu_unmap_sg,
.sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu,
.sync_sg_for_device = arm_iommu_sync_sg_for_device,
-
- .set_dma_mask = arm_dma_set_mask,
};

struct dma_map_ops iommu_coherent_ops = {
@@ -1867,8 +1853,6 @@ struct dma_map_ops iommu_coherent_ops = {

.map_sg = arm_coherent_iommu_map_sg,
.unmap_sg = arm_coherent_iommu_unmap_sg,
-
- .set_dma_mask = arm_dma_set_mask,
};

/**
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 03e75fe..b7bcf17 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -179,7 +179,6 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
.map_page = xen_swiotlb_map_page,
.unmap_page = xen_swiotlb_unmap_page,
.dma_supported = xen_swiotlb_dma_supported,
- .set_dma_mask = xen_swiotlb_set_dma_mask,
};

int __init xen_mm_init(void)
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index f519a58..cfdb34b 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -84,15 +84,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
return (phys_addr_t)dev_addr;
}

-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
- *dev->dma_mask = mask;
-
- return 0;
-}
-
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
diff --git a/arch/h8300/include/asm/dma-mapping.h b/arch/h8300/include/asm/dma-mapping.h
index 48d652e..d9b5b80 100644
--- a/arch/h8300/include/asm/dma-mapping.h
+++ b/arch/h8300/include/asm/dma-mapping.h
@@ -10,9 +10,4 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)

#include <asm-generic/dma-mapping-common.h>

-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
- return 0;
-}
-
#endif
diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
index 36e8de7..268fde8 100644
--- a/arch/hexagon/include/asm/dma-mapping.h
+++ b/arch/hexagon/include/asm/dma-mapping.h
@@ -45,7 +45,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)

#define HAVE_ARCH_DMA_SUPPORTED 1
extern int dma_supported(struct device *dev, u64 mask);
-extern int dma_set_mask(struct device *dev, u64 mask);
extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index b74f9ba..9e3ddf7 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c
@@ -44,17 +44,6 @@ int dma_supported(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(dma_supported);

-int dma_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
-
- *dev->dma_mask = mask;
-
- return 0;
-}
-EXPORT_SYMBOL(dma_set_mask);
-
static struct gen_pool *coherent_pool;

diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index 7982caa..9beccf8 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -27,15 +27,6 @@ extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,

#include <asm-generic/dma-mapping-common.h>

-static inline int
-dma_set_mask (struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
- *dev->dma_mask = mask;
- return 0;
-}
-
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
index 0aa5d8a..24b1297 100644
--- a/arch/microblaze/include/asm/dma-mapping.h
+++ b/arch/microblaze/include/asm/dma-mapping.h
@@ -44,20 +44,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
return &dma_direct_ops;
}

-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
-{
- struct dma_map_ops *ops = get_dma_ops(dev);
-
- if (unlikely(ops == NULL))
- return -EIO;
- if (ops->set_dma_mask)
- return ops->set_dma_mask(dev, dma_mask);
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
- *dev->dma_mask = dma_mask;
- return 0;
-}
-
#include <asm-generic/dma-mapping-common.h>

static inline void __dma_sync(unsigned long paddr,
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 8bf8ec3..e604f76 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -31,22 +31,6 @@ static inline void dma_mark_clean(void *addr, size_t size) {}

#include <asm-generic/dma-mapping-common.h>

-static inline int
-dma_set_mask(struct device *dev, u64 mask)
-{
- struct dma_map_ops *ops = get_dma_ops(dev);
-
- if(!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
-
- if (ops->set_dma_mask)
- return ops->set_dma_mask(dev, mask);
-
- *dev->dma_mask = mask;
-
- return 0;
-}
-
extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);

diff --git a/arch/openrisc/include/asm/dma-mapping.h b/arch/openrisc/include/asm/dma-mapping.h
index 8fc08b8..413bfcf 100644
--- a/arch/openrisc/include/asm/dma-mapping.h
+++ b/arch/openrisc/include/asm/dma-mapping.h
@@ -44,13 +44,4 @@ static inline int dma_supported(struct device *dev, u64 dma_mask)

#include <asm-generic/dma-mapping-common.h>

-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
-
- *dev->dma_mask = dma_mask;
-
- return 0;
-}
#endif /* __ASM_OPENRISC_DMA_MAPPING_H */
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index e2ff85c..6dd7a0e 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -122,9 +122,11 @@ static inline void set_dma_offset(struct device *dev, dma_addr_t 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);
+
#include <asm-generic/dma-mapping-common.h>

-extern int dma_set_mask(struct device *dev, u64 dma_mask);
extern int __dma_set_mask(struct device *dev, u64 dma_mask);
extern u64 __dma_get_required_mask(struct device *dev);

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 14a582b..55c60f4 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -958,9 +958,6 @@ out:

static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask)
{
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
-
if (dma_mask == DMA_BIT_MASK(64) &&
cell_iommu_get_fixed_address(dev) != OF_BAD_ADDR)
{
diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index 1f42489..b3fd54d 100644
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h
@@ -18,8 +18,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
return &s390_dma_ops;
}

-extern int dma_set_mask(struct device *dev, u64 mask);
-
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 6fd8d58..ad5a1b4 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -262,16 +262,6 @@ out:
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
}

-int dma_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
-
- *dev->dma_mask = mask;
- return 0;
-}
-EXPORT_SYMBOL_GPL(dma_set_mask);
-
static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
index 088f6e5..a3745a3 100644
--- a/arch/sh/include/asm/dma-mapping.h
+++ b/arch/sh/include/asm/dma-mapping.h
@@ -13,20 +13,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)

#include <asm-generic/dma-mapping-common.h>

-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
- struct dma_map_ops *ops = get_dma_ops(dev);
-
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
- if (ops->set_dma_mask)
- return ops->set_dma_mask(dev, mask);
-
- *dev->dma_mask = mask;
-
- return 0;
-}
-
void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir);

diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
index 184651b..c643170 100644
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -37,8 +37,7 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
return dma_ops;
}

-#include <asm-generic/dma-mapping-common.h>
-
+#define HAVE_ARCH_DMA_SET_MASK 1
static inline int dma_set_mask(struct device *dev, u64 mask)
{
#ifdef CONFIG_PCI
@@ -52,4 +51,6 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
return -EINVAL;
}

+#include <asm-generic/dma-mapping-common.h>
+
#endif
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 559ed4a..ed0d4ed 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -59,8 +59,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)

static inline void dma_mark_clean(void *addr, size_t size) {}

-#include <asm-generic/dma-mapping-common.h>
-
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
dev->archdata.dma_ops = ops;
@@ -74,6 +72,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
return addr + size - 1 <= *dev->dma_mask;
}

+#define HAVE_ARCH_DMA_SET_MASK 1
static inline int
dma_set_mask(struct device *dev, u64 mask)
{
@@ -103,6 +102,8 @@ dma_set_mask(struct device *dev, u64 mask)
return 0;
}

+#include <asm-generic/dma-mapping-common.h>
+
/*
* dma_alloc_noncoherent() is #defined to return coherent memory,
* so there's no need to do any flushing here.
diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index 21231c1..8140e05 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h
@@ -50,16 +50,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)

static inline void dma_mark_clean(void *addr, size_t size) {}

-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, dma_mask))
- return -EIO;
-
- *dev->dma_mask = dma_mask;
-
- return 0;
-}
-
static inline void dma_cache_sync(struct device *dev, void *vaddr,
size_t size, enum dma_data_direction direction)
{
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index b1fbf58..953b726 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -48,8 +48,6 @@ extern int dma_supported(struct device *hwdev, u64 mask);

#include <asm-generic/dma-mapping-common.h>

-extern int dma_set_mask(struct device *dev, u64 mask);
-
extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addr, gfp_t flag,
struct dma_attrs *attrs);
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index bd23971..84b8ef8 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -58,17 +58,6 @@ EXPORT_SYMBOL(x86_dma_fallback_dev);
/* Number of entries preallocated for DMA-API debugging */
#define PREALLOC_DMA_DEBUG_ENTRIES 65536

-int dma_set_mask(struct device *dev, u64 mask)
-{
- if (!dev->dma_mask || !dma_supported(dev, mask))
- return -EIO;
-
- *dev->dma_mask = mask;
-
- return 0;
-}
-EXPORT_SYMBOL(dma_set_mask);
-
void __init pci_iommu_alloc(void)
{
struct iommu_table_entry *p;
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index da1029e..0fff76b 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -668,15 +668,3 @@ xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
return xen_virt_to_bus(xen_io_tlb_end - 1) <= mask;
}
EXPORT_SYMBOL_GPL(xen_swiotlb_dma_supported);
-
-int
-xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask)
-{
- if (!dev->dma_mask || !xen_swiotlb_dma_supported(dev, dma_mask))
- return -EIO;
-
- *dev->dma_mask = dma_mask;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask);
diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index 67fa6bc..ca65214 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h
@@ -340,4 +340,20 @@ static inline int dma_supported(struct device *dev, u64 mask)
}
#endif

+#ifndef HAVE_ARCH_DMA_SET_MASK
+static inline int dma_set_mask(struct device *dev, u64 mask)
+{
+ struct dma_map_ops *ops = get_dma_ops(dev);
+
+ if (!dev->dma_mask || !dma_supported(dev, mask))
+ return -EIO;
+
+ if (ops->set_dma_mask)
+ return ops->set_dma_mask(dev, mask);
+
+ *dev->dma_mask = mask;
+ return 0;
+}
+#endif
+
#endif
diff --git a/include/xen/swiotlb-xen.h b/include/xen/swiotlb-xen.h
index 8b2eb93..4d81ccc 100644
--- a/include/xen/swiotlb-xen.h
+++ b/include/xen/swiotlb-xen.h
@@ -56,6 +56,4 @@ xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
extern int
xen_swiotlb_dma_supported(struct device *hwdev, u64 mask);

-extern int
-xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask);
#endif /* __LINUX_SWIOTLB_XEN_H */
--
1.9.1