[PATCH 4/8] ARM: dma-mapping: implement dma sg methods on top of generic dma ops
Marek Szyprowski
m.szyprowski at samsung.com
Mon Jun 20 03:50:09 EDT 2011
This patch converts all dma_sg methods to be generic (independent of the
current DMA mapping implementation for ARM architecture). All dma sg
operations are now implemented on top of respective
dma_map_page/dma_sync_single_for* operations from dma_map_ops structure.
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
arch/arm/include/asm/dma-mapping.h | 10 +++---
arch/arm/mm/dma-mapping.c | 59 ++++++++++++++++-------------------
2 files changed, 32 insertions(+), 37 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index f4e4968..fa73efc 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -340,15 +340,15 @@ static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,
#endif /* CONFIG_DMABOUNCE */
/*
- * The scatter list versions of the above methods.
+ * The generic scatter list versions of dma methods.
*/
-extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
+extern int generic_dma_map_sg(struct device *, struct scatterlist *, int,
enum dma_data_direction, struct dma_attrs *attrs);
-extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
+extern void generic_dma_unmap_sg(struct device *, struct scatterlist *, int,
enum dma_data_direction, struct dma_attrs *attrs);
-extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
+extern void generic_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
enum dma_data_direction);
-extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
+extern void generic_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
enum dma_data_direction);
#endif /* __KERNEL__ */
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 5264552..ebbd76c 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -107,12 +107,12 @@ static int arm_dma_set_mask(struct device *dev, u64 dma_mask)
struct dma_map_ops dma_ops = {
.map_page = arm_dma_map_page,
.unmap_page = arm_dma_unmap_page,
- .map_sg = arm_dma_map_sg,
- .unmap_sg = arm_dma_unmap_sg,
.sync_single_for_cpu = arm_dma_sync_single_for_cpu,
.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,
+ .map_sg = generic_dma_map_sg,
+ .unmap_sg = generic_dma_unmap_sg,
+ .sync_sg_for_cpu = generic_dma_sync_sg_for_cpu,
+ .sync_sg_for_device = generic_dma_sync_sg_for_device,
.set_dma_mask = arm_dma_set_mask,
};
EXPORT_SYMBOL(dma_ops);
@@ -635,7 +635,7 @@ void ___dma_page_dev_to_cpu(struct page *page, unsigned long off,
EXPORT_SYMBOL(___dma_page_dev_to_cpu);
/**
- * dma_map_sg - map a set of SG buffers for streaming mode DMA
+ * generic_map_sg - map a set of SG buffers for streaming mode DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map
@@ -650,15 +650,16 @@ EXPORT_SYMBOL(___dma_page_dev_to_cpu);
* Device ownership issues as mentioned for dma_map_single are the same
* here.
*/
-int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+int generic_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
struct scatterlist *s;
int i, j;
for_each_sg(sg, s, nents, i) {
- s->dma_address = __dma_map_page(dev, sg_page(s), s->offset,
- s->length, dir);
+ s->dma_address = ops->map_page(dev, sg_page(s), s->offset,
+ s->length, dir, attrs);
if (dma_mapping_error(dev, s->dma_address))
goto bad_mapping;
}
@@ -666,12 +667,12 @@ int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
bad_mapping:
for_each_sg(sg, s, i, j)
- __dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
+ ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
return 0;
}
/**
- * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
+ * generic_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to unmap (same as was passed to dma_map_sg)
@@ -680,60 +681,54 @@ int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
* Unmap a set of streaming mode DMA translations. Again, CPU access
* rules concerning calls here are the same as for dma_unmap_single().
*/
-void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+void generic_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
struct scatterlist *s;
+
int i;
for_each_sg(sg, s, nents, i)
- __dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
+ ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
}
/**
- * dma_sync_sg_for_cpu
+ * generic_sync_sg_for_cpu
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map (returned from dma_map_sg)
* @dir: DMA transfer direction (same as was passed to dma_map_sg)
*/
-void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+void generic_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
struct scatterlist *s;
int i;
- for_each_sg(sg, s, nents, i) {
- if (!dmabounce_sync_for_cpu(dev, sg_dma_address(s),
- sg_dma_len(s), dir))
- continue;
-
- __dma_page_dev_to_cpu(sg_page(s), s->offset,
- s->length, dir);
- }
+ for_each_sg(sg, s, nents, i)
+ ops->sync_single_for_cpu(dev, sg_dma_address(s) + s->offset,
+ s->length, dir);
}
/**
- * dma_sync_sg_for_device
+ * generic_sync_sg_for_device
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @sg: list of buffers
* @nents: number of buffers to map (returned from dma_map_sg)
* @dir: DMA transfer direction (same as was passed to dma_map_sg)
*/
-void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+void generic_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
+ struct dma_map_ops *ops = get_dma_ops(dev);
struct scatterlist *s;
int i;
- for_each_sg(sg, s, nents, i) {
- if (!dmabounce_sync_for_device(dev, sg_dma_address(s),
- sg_dma_len(s), dir))
- continue;
-
- __dma_page_cpu_to_dev(sg_page(s), s->offset,
- s->length, dir);
- }
+ for_each_sg(sg, s, nents, i)
+ ops->sync_single_for_device(dev, sg_dma_address(s) + s->offset,
+ s->length, dir);
}
#define PREALLOC_DMA_DEBUG_ENTRIES 4096
--
1.7.1.569.g6f426
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