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authorChristoph Hellwig <hch@lst.de>2020-09-01 13:34:33 +0200
committerChristoph Hellwig <hch@lst.de>2020-09-25 06:20:47 +0200
commitefa70f2fdc842e63a0a13223e0e83cedcc2117f1 (patch)
treeef21550627a0a50be9edf10c53542f9c59a61896 /include/linux/dma-mapping.h
parent5a84292271402cffe0717bc58e2ad9a0c7977272 (diff)
dma-mapping: add a new dma_alloc_pages API
This API is the equivalent of alloc_pages, except that the returned memory is guaranteed to be DMA addressable by the passed in device. The implementation will also be used to provide a more sensible replacement for DMA_ATTR_NON_CONSISTENT flag. Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages as its backend. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> (MIPS part)
Diffstat (limited to 'include/linux/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h34
1 files changed, 17 insertions, 17 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 233bb8dcbe02..4b9b1d64f5ec 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -28,11 +28,6 @@
*/
#define DMA_ATTR_WRITE_COMBINE (1UL << 2)
/*
- * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
- * consistent or non-consistent memory as it sees fit.
- */
-#define DMA_ATTR_NON_CONSISTENT (1UL << 3)
-/*
* DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
* virtual mapping for the allocated buffer.
*/
@@ -74,6 +69,11 @@ struct dma_map_ops {
void (*free)(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs);
+ struct page *(*alloc_pages)(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir,
+ gfp_t gfp);
+ void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
+ dma_addr_t dma_handle, enum dma_data_direction dir);
int (*mmap)(struct device *, struct vm_area_struct *,
void *, dma_addr_t, size_t,
unsigned long attrs);
@@ -376,17 +376,14 @@ static inline unsigned long dma_get_merge_boundary(struct device *dev)
}
#endif /* CONFIG_HAS_DMA */
-static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
-{
- return dma_alloc_attrs(dev, size, dma_handle, gfp,
- DMA_ATTR_NON_CONSISTENT);
-}
-static inline void dma_free_noncoherent(struct device *dev, size_t size,
- void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir)
-{
- dma_free_attrs(dev, size, vaddr, dma_handle, DMA_ATTR_NON_CONSISTENT);
-}
+struct page *dma_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_free_pages(struct device *dev, size_t size, struct page *page,
+ dma_addr_t dma_handle, enum dma_data_direction dir);
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, enum dma_data_direction dir);
static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
size_t size, enum dma_data_direction dir, unsigned long attrs)
@@ -512,7 +509,10 @@ static inline void dma_sync_sgtable_for_device(struct device *dev,
extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
-
+struct page *dma_common_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_common_free_pages(struct device *dev, size_t size, struct page *vaddr,
+ dma_addr_t dma_handle, enum dma_data_direction dir);
struct page **dma_common_find_pages(void *cpu_addr);
void *dma_common_contiguous_remap(struct page *page, size_t size,
pgprot_t prot, const void *caller);