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include/linux/dma-mapping.h
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#ifndef _LINUX_DMA_MAPPING_H #define _LINUX_DMA_MAPPING_H |
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#include <linux/string.h> |
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#include <linux/device.h> #include <linux/err.h> |
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#include <linux/dma-attrs.h> |
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#include <linux/dma-direction.h> |
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#include <linux/scatterlist.h> |
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struct dma_map_ops { void* (*alloc_coherent)(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); void (*free_coherent)(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); dma_addr_t (*map_page)(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); void (*sync_single_for_device)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); |
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void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir); void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir); int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); int (*dma_supported)(struct device *dev, u64 mask); |
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int (*set_dma_mask)(struct device *dev, u64 mask); |
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#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK u64 (*get_required_mask)(struct device *dev); #endif |
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int is_phys; }; |
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
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#define DMA_MASK_NONE 0x0ULL |
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static inline int valid_dma_direction(int dma_direction) { return ((dma_direction == DMA_BIDIRECTIONAL) || (dma_direction == DMA_TO_DEVICE) || (dma_direction == DMA_FROM_DEVICE)); } |
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static inline int is_device_dma_capable(struct device *dev) { return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; } |
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#ifdef CONFIG_HAS_DMA |
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#include <asm/dma-mapping.h> |
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#else #include <asm-generic/dma-mapping-broken.h> #endif |
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static inline u64 dma_get_mask(struct device *dev) { |
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if (dev && dev->dma_mask && *dev->dma_mask) |
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return *dev->dma_mask; |
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return DMA_BIT_MASK(32); |
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} |
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#ifdef ARCH_HAS_DMA_SET_COHERENT_MASK int dma_set_coherent_mask(struct device *dev, u64 mask); #else |
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static inline int dma_set_coherent_mask(struct device *dev, u64 mask) { if (!dma_supported(dev, mask)) return -EIO; dev->coherent_dma_mask = mask; return 0; } |
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#endif |
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extern u64 dma_get_required_mask(struct device *dev); |
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static inline unsigned int dma_get_max_seg_size(struct device *dev) { return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; } static inline unsigned int dma_set_max_seg_size(struct device *dev, unsigned int size) { if (dev->dma_parms) { dev->dma_parms->max_segment_size = size; return 0; } else return -EIO; } |
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static inline unsigned long dma_get_seg_boundary(struct device *dev) { return dev->dma_parms ? dev->dma_parms->segment_boundary_mask : 0xffffffff; } static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) { if (dev->dma_parms) { dev->dma_parms->segment_boundary_mask = mask; return 0; } else return -EIO; } |
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static inline void *dma_zalloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag) { void *ret = dma_alloc_coherent(dev, size, dma_handle, flag); if (ret) memset(ret, 0, size); return ret; } |
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#ifdef CONFIG_HAS_DMA |
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static inline int dma_get_cache_alignment(void) { #ifdef ARCH_DMA_MINALIGN return ARCH_DMA_MINALIGN; #endif return 1; } |
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#endif |
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/* flags for the coherent memory api */ #define DMA_MEMORY_MAP 0x01 #define DMA_MEMORY_IO 0x02 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 #define DMA_MEMORY_EXCLUSIVE 0x08 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY static inline int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags) { return 0; } static inline void dma_release_declared_memory(struct device *dev) { } static inline void * dma_mark_declared_memory_occupied(struct device *dev, dma_addr_t device_addr, size_t size) { return ERR_PTR(-EBUSY); } #endif |
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/* * Managed DMA API */ extern void *dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags); extern void dmam_release_declared_memory(struct device *dev); #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ static inline int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, gfp_t gfp) { return 0; } |
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static inline void dmam_release_declared_memory(struct device *dev) { } #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ |
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#ifndef CONFIG_HAVE_DMA_ATTRS struct dma_attrs; #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ dma_map_single(dev, cpu_addr, size, dir) #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ dma_unmap_single(dev, dma_addr, size, dir) #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_map_sg(dev, sgl, nents, dir) #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_unmap_sg(dev, sgl, nents, dir) #endif /* CONFIG_HAVE_DMA_ATTRS */ |
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#ifdef CONFIG_NEED_DMA_MAP_STATE #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) #else #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) #define dma_unmap_addr(PTR, ADDR_NAME) (0) #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) #define dma_unmap_len(PTR, LEN_NAME) (0) #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) #endif |
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#endif |