#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> extern dma_addr_t bad_dma_address; extern int iommu_merge; extern struct device fallback_dev; extern int panic_on_overflow; extern int forbid_dac; extern int force_iommu; struct dma_mapping_ops { int (*mapping_error)(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); /* like map_single, but doesn't check the device mask */ dma_addr_t (*map_simple)(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 const struct dma_mapping_ops *dma_ops; static inline int dma_mapping_error(dma_addr_t dma_addr) { if (dma_ops->mapping_error) return dma_ops->mapping_error(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) void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag); void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); 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) { BUG_ON(!valid_dma_direction(direction)); return dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->unmap_single) dma_ops->unmap_single(dev, addr, size, direction); } static inline int dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction) { BUG_ON(!valid_dma_direction(direction)); return dma_ops->map_sg(hwdev, sg, nents, direction); } static inline void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->unmap_sg) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_single_for_cpu) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_single_for_device) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_single_range_for_cpu) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_single_range_for_device) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_sg_for_cpu) dma_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) { BUG_ON(!valid_dma_direction(direction)); if (dma_ops->sync_sg_for_device) dma_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) { BUG_ON(!valid_dma_direction(direction)); return dma_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; } #define dma_is_consistent(d, h) (1) #ifdef CONFIG_X86_32 # define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY struct dma_coherent_mem { void *virt_base; u32 device_base; int size; int flags; unsigned long *bitmap; }; extern int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags); extern void dma_release_declared_memory(struct device *dev); extern void * dma_mark_declared_memory_occupied(struct device *dev, dma_addr_t device_addr, size_t size); #endif /* CONFIG_X86_32 */ #endif