| #ifndef _ASM_X86_DMA_MAPPING_H |
| #define _ASM_X86_DMA_MAPPING_H |
| |
| /* |
| * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for |
| * documentation. |
| */ |
| |
| #include <linux/scatterlist.h> |
| #include <asm/io.h> |
| #include <asm/swiotlb.h> |
| #include <asm-generic/dma-coherent.h> |
| |
| extern dma_addr_t bad_dma_address; |
| extern int iommu_merge; |
| extern struct device x86_dma_fallback_dev; |
| extern int panic_on_overflow; |
| |
| struct dma_mapping_ops { |
| int (*mapping_error)(struct device *dev, |
| dma_addr_t dma_addr); |
| 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_single)(struct device *hwdev, phys_addr_t ptr, |
| size_t size, int direction); |
| void (*unmap_single)(struct device *dev, dma_addr_t addr, |
| size_t size, int direction); |
| void (*sync_single_for_cpu)(struct device *hwdev, |
| dma_addr_t dma_handle, size_t size, |
| int direction); |
| void (*sync_single_for_device)(struct device *hwdev, |
| dma_addr_t dma_handle, size_t size, |
| int direction); |
| void (*sync_single_range_for_cpu)(struct device *hwdev, |
| dma_addr_t dma_handle, unsigned long offset, |
| size_t size, int direction); |
| void (*sync_single_range_for_device)(struct device *hwdev, |
| dma_addr_t dma_handle, unsigned long offset, |
| size_t size, int direction); |
| void (*sync_sg_for_cpu)(struct device *hwdev, |
| struct scatterlist *sg, int nelems, |
| int direction); |
| void (*sync_sg_for_device)(struct device *hwdev, |
| struct scatterlist *sg, int nelems, |
| int direction); |
| int (*map_sg)(struct device *hwdev, struct scatterlist *sg, |
| int nents, int direction); |
| void (*unmap_sg)(struct device *hwdev, |
| struct scatterlist *sg, int nents, |
| int direction); |
| int (*dma_supported)(struct device *hwdev, u64 mask); |
| int is_phys; |
| }; |
| |
| 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) |
| { |
| struct dma_mapping_ops *ops = get_dma_ops(dev); |
| if (ops->mapping_error) |
| return ops->mapping_error(dev, dma_addr); |
| |
| return (dma_addr == bad_dma_address); |
| } |
| |
| #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
| #define dma_is_consistent(d, h) (1) |
| |
| extern int dma_supported(struct device *hwdev, u64 mask); |
| 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); |
| |
| 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 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 (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 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 (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 (ops->sync_single_for_cpu) |
| ops->sync_single_for_cpu(hwdev, dma_handle, size, direction); |
| flush_write_buffers(); |
| } |
| |
| 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 (ops->sync_single_for_device) |
| ops->sync_single_for_device(hwdev, dma_handle, size, direction); |
| flush_write_buffers(); |
| } |
| |
| 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) |
| { |
| 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(); |
| } |
| |
| static inline void |
| dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle, |
| unsigned long offset, size_t size, |
| int 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(); |
| } |
| |
| 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 (ops->sync_sg_for_cpu) |
| ops->sync_sg_for_cpu(hwdev, sg, nelems, direction); |
| flush_write_buffers(); |
| } |
| |
| 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 (ops->sync_sg_for_device) |
| ops->sync_sg_for_device(hwdev, sg, nelems, direction); |
| |
| flush_write_buffers(); |
| } |
| |
| 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 ops->map_single(dev, page_to_phys(page) + offset, |
| size, direction); |
| } |
| |
| static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, |
| size_t size, int direction) |
| { |
| dma_unmap_single(dev, addr, size, direction); |
| } |
| |
| static inline void |
| dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
| enum dma_data_direction dir) |
| { |
| flush_write_buffers(); |
| } |
| |
| static inline int dma_get_cache_alignment(void) |
| { |
| /* no easy way to get cache size on all x86, so return the |
| * maximum possible, to be safe */ |
| return boot_cpu_data.x86_clflush_size; |
| } |
| |
| static inline unsigned long dma_alloc_coherent_mask(struct device *dev, |
| gfp_t gfp) |
| { |
| unsigned long dma_mask = 0; |
| |
| dma_mask = dev->coherent_dma_mask; |
| if (!dma_mask) |
| dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK; |
| |
| return dma_mask; |
| } |
| |
| static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp) |
| { |
| unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); |
| |
| if (dma_mask <= DMA_24BIT_MASK) |
| gfp |= GFP_DMA; |
| #ifdef CONFIG_X86_64 |
| if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA)) |
| gfp |= GFP_DMA32; |
| #endif |
| return gfp; |
| } |
| |
| static inline void * |
| dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| gfp_t gfp) |
| { |
| struct dma_mapping_ops *ops = get_dma_ops(dev); |
| void *memory; |
| |
| gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| |
| if (dma_alloc_from_coherent(dev, size, dma_handle, &memory)) |
| return memory; |
| |
| if (!dev) { |
| dev = &x86_dma_fallback_dev; |
| gfp |= GFP_DMA; |
| } |
| |
| if (!is_device_dma_capable(dev)) |
| return NULL; |
| |
| if (!ops->alloc_coherent) |
| return NULL; |
| |
| return ops->alloc_coherent(dev, size, dma_handle, |
| dma_alloc_coherent_gfp_flags(dev, gfp)); |
| } |
| |
| static inline void dma_free_coherent(struct device *dev, size_t size, |
| void *vaddr, dma_addr_t bus) |
| { |
| struct dma_mapping_ops *ops = get_dma_ops(dev); |
| |
| WARN_ON(irqs_disabled()); /* for portability */ |
| |
| if (dma_release_from_coherent(dev, get_order(size), vaddr)) |
| return; |
| |
| if (ops->free_coherent) |
| ops->free_coherent(dev, size, vaddr, bus); |
| } |
| |
| #endif |