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Subject[PATCH 2/2] x86: per-device dma_mapping_ops support
Date
This adds per-device dma_mapping_ops support for CONFIG_X86_64.

A pointer to dma_mapping_ops to struct dev_archdata is added. If the
pointer is non NULL, DMA operations in asm/dma-mapping.h use it. If
it's NULL, the system-wide dma_ops pointer is used as before.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
arch/x86/kernel/pci-calgary_64.c | 2 +-
arch/x86/kernel/pci-dma.c | 2 +-
arch/x86/kernel/pci-gart_64.c | 2 +-
arch/x86/kernel/pci-nommu.c | 14 +-----
arch/x86/kernel/pci-swiotlb_64.c | 2 +-
include/asm-x86/device.h | 3 +
include/asm-x86/dma-mapping.h | 95 ++++++++++++++++++++++++++------------
7 files changed, 74 insertions(+), 46 deletions(-)
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index e28ec49..dca9a82 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -541,7 +541,7 @@ error:
return ret;
}

-static const struct dma_mapping_ops calgary_dma_ops = {
+static struct dma_mapping_ops calgary_dma_ops = {
.alloc_coherent = calgary_alloc_coherent,
.map_single = calgary_map_single,
.unmap_single = calgary_unmap_single,
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 0c37f16..33ded93 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -11,7 +11,7 @@
int forbid_dac __read_mostly;
EXPORT_SYMBOL(forbid_dac);

-const struct dma_mapping_ops *dma_ops;
+struct dma_mapping_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);

static int iommu_sac_force __read_mostly;
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index e1a6954..8469f76 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -621,7 +621,7 @@ static __init int init_k8_gatt(struct agp_kern_info *info)

extern int agp_amd64_init(void);

-static const struct dma_mapping_ops gart_dma_ops = {
+static struct dma_mapping_ops gart_dma_ops = {
.map_single = gart_map_single,
.map_simple = gart_map_simple,
.unmap_single = gart_unmap_single,
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 05d70b8..67cc5ee 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -72,21 +72,9 @@ static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
return nents;
}

-/* Make sure we keep the same behaviour */
-static int nommu_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
-{
-#ifdef CONFIG_X86_32
- return 0;
-#else
- return (dma_addr == bad_dma_address);
-#endif
-}
-
-
-const struct dma_mapping_ops nommu_dma_ops = {
+struct dma_mapping_ops nommu_dma_ops = {
.map_single = nommu_map_single,
.map_sg = nommu_map_sg,
- .mapping_error = nommu_mapping_error,
.is_phys = 1,
};

diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index 490da7f..a464016 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -18,7 +18,7 @@ swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
}

-const struct dma_mapping_ops swiotlb_dma_ops = {
+struct dma_mapping_ops swiotlb_dma_ops = {
.mapping_error = swiotlb_dma_mapping_error,
.alloc_coherent = swiotlb_alloc_coherent,
.free_coherent = swiotlb_free_coherent,
diff --git a/include/asm-x86/device.h b/include/asm-x86/device.h
index 87a7153..3c034f4 100644
--- a/include/asm-x86/device.h
+++ b/include/asm-x86/device.h
@@ -5,6 +5,9 @@ struct dev_archdata {
#ifdef CONFIG_ACPI
void *acpi_handle;
#endif
+#ifdef CONFIG_X86_64
+struct dma_mapping_ops *dma_ops;
+#endif
#ifdef CONFIG_DMAR
void *iommu; /* hook for IOMMU specific extension */
#endif
diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 69626b6..feb9a53 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -58,14 +58,33 @@ struct dma_mapping_ops {
int is_phys;
};

-extern const struct dma_mapping_ops *dma_ops;
+extern struct dma_mapping_ops *dma_ops;

+static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+#ifdef CONFIG_X86_32
+ return dma_ops;
+#else
+ if (unlikely(!dev) || !dev->archdata.dma_ops)
+ return dma_ops;
+ else
+ return dev->archdata.dma_ops;
+#endif
+}
+
+/* Make sure we keep the same behaviour */
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
- if (dma_ops->mapping_error)
- return dma_ops->mapping_error(dev, dma_addr);
+ struct dma_mapping_ops *ops = get_dma_ops(dev);
+
+#ifdef CONFIG_X86_32
+ return 0;
+#else
+ if (ops->mapping_error)
+ return ops->mapping_error(dev, dma_addr);

return (dma_addr == bad_dma_address);
+#endif
}

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
@@ -85,44 +104,53 @@ static inline dma_addr_t
dma_map_single(struct device *hwdev, void *ptr, size_t size,
int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
+ return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
}

static inline void
dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(dev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->unmap_single)
- dma_ops->unmap_single(dev, addr, size, direction);
+ if (ops->unmap_single)
+ ops->unmap_single(dev, addr, size, direction);
}

static inline int
dma_map_sg(struct device *hwdev, struct scatterlist *sg,
int nents, int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- return dma_ops->map_sg(hwdev, sg, nents, direction);
+ return ops->map_sg(hwdev, sg, nents, direction);
}

static inline void
dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->unmap_sg)
- dma_ops->unmap_sg(hwdev, sg, nents, direction);
+ if (ops->unmap_sg)
+ ops->unmap_sg(hwdev, sg, nents, direction);
}

static inline void
dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_single_for_cpu)
- dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
- direction);
+ if (ops->sync_single_for_cpu)
+ ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
flush_write_buffers();
}

@@ -130,10 +158,11 @@ static inline void
dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
size_t size, int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_single_for_device)
- dma_ops->sync_single_for_device(hwdev, dma_handle, size,
- direction);
+ if (ops->sync_single_for_device)
+ ops->sync_single_for_device(hwdev, dma_handle, size, direction);
flush_write_buffers();
}

@@ -141,11 +170,12 @@ static inline void
dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size, int direction)
{
- BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_single_range_for_cpu)
- dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
- size, direction);
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);

+ BUG_ON(!valid_dma_direction(direction));
+ if (ops->sync_single_range_for_cpu)
+ ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
+ size, direction);
flush_write_buffers();
}

@@ -154,11 +184,12 @@ dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
unsigned long offset, size_t size,
int direction)
{
- BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_single_range_for_device)
- dma_ops->sync_single_range_for_device(hwdev, dma_handle,
- offset, size, direction);
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);

+ BUG_ON(!valid_dma_direction(direction));
+ if (ops->sync_single_range_for_device)
+ ops->sync_single_range_for_device(hwdev, dma_handle,
+ offset, size, direction);
flush_write_buffers();
}

@@ -166,9 +197,11 @@ static inline void
dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_sg_for_cpu)
- dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
+ if (ops->sync_sg_for_cpu)
+ ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
flush_write_buffers();
}

@@ -176,9 +209,11 @@ static inline void
dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
int nelems, int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(hwdev);
+
BUG_ON(!valid_dma_direction(direction));
- if (dma_ops->sync_sg_for_device)
- dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
+ if (ops->sync_sg_for_device)
+ ops->sync_sg_for_device(hwdev, sg, nelems, direction);

flush_write_buffers();
}
@@ -187,9 +222,11 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
size_t offset, size_t size,
int direction)
{
+ struct dma_mapping_ops *ops = get_dma_ops(dev);
+
BUG_ON(!valid_dma_direction(direction));
- return dma_ops->map_single(dev, page_to_phys(page)+offset,
- size, direction);
+ return ops->map_single(dev, page_to_phys(page) + offset,
+ size, direction);
}

static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
--
1.5.4.2


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