#ifndef _ASM_DMA_MAPPING_H_ #define _ASM_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) { #ifdef CONFIG_X86_32 return 0; #else 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); #endif } #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); 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) { #ifdef CONFIG_X86_64 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); 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 (!dev->dma_mask) 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