| #ifndef _ASM_X86_DMA_MAPPING_H |
| #define _ASM_X86_DMA_MAPPING_H |
| |
| /* |
| * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and |
| * Documentation/DMA-API.txt for documentation. |
| */ |
| |
| #include <linux/kmemcheck.h> |
| #include <linux/scatterlist.h> |
| #include <linux/dma-debug.h> |
| #include <linux/dma-attrs.h> |
| #include <asm/io.h> |
| #include <asm/swiotlb.h> |
| #include <asm-generic/dma-coherent.h> |
| |
| #ifdef CONFIG_ISA |
| # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24) |
| #else |
| # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32) |
| #endif |
| |
| #define DMA_ERROR_CODE 0 |
| |
| extern int iommu_merge; |
| extern struct device x86_dma_fallback_dev; |
| extern int panic_on_overflow; |
| |
| extern struct dma_map_ops *dma_ops; |
| |
| static inline struct dma_map_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 |
| } |
| |
| #include <asm-generic/dma-mapping-common.h> |
| |
| /* Make sure we keep the same behaviour */ |
| static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| { |
| struct dma_map_ops *ops = get_dma_ops(dev); |
| if (ops->mapping_error) |
| return ops->mapping_error(dev, dma_addr); |
| |
| return (dma_addr == DMA_ERROR_CODE); |
| } |
| |
| #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) |
| |
| 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, |
| struct dma_attrs *attrs); |
| |
| static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| { |
| if (!dev->dma_mask) |
| return 0; |
| |
| return addr + size - 1 <= *dev->dma_mask; |
| } |
| |
| static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| { |
| return paddr; |
| } |
| |
| static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) |
| { |
| return daddr; |
| } |
| |
| static inline void |
| dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
| enum dma_data_direction dir) |
| { |
| flush_write_buffers(); |
| } |
| |
| 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_BIT_MASK(24) : DMA_BIT_MASK(32); |
| |
| 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_BIT_MASK(24)) |
| gfp |= GFP_DMA; |
| #ifdef CONFIG_X86_64 |
| if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) |
| gfp |= GFP_DMA32; |
| #endif |
| return gfp; |
| } |
| |
| #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL) |
| |
| static inline void * |
| dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| gfp_t gfp, struct dma_attrs *attrs) |
| { |
| struct dma_map_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; |
| |
| if (!is_device_dma_capable(dev)) |
| return NULL; |
| |
| if (!ops->alloc) |
| return NULL; |
| |
| memory = ops->alloc(dev, size, dma_handle, |
| dma_alloc_coherent_gfp_flags(dev, gfp), attrs); |
| debug_dma_alloc_coherent(dev, size, *dma_handle, memory); |
| |
| return memory; |
| } |
| |
| #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL) |
| |
| static inline void dma_free_attrs(struct device *dev, size_t size, |
| void *vaddr, dma_addr_t bus, |
| struct dma_attrs *attrs) |
| { |
| struct dma_map_ops *ops = get_dma_ops(dev); |
| |
| WARN_ON(irqs_disabled()); /* for portability */ |
| |
| if (dma_release_from_coherent(dev, get_order(size), vaddr)) |
| return; |
| |
| debug_dma_free_coherent(dev, size, vaddr, bus); |
| if (ops->free) |
| ops->free(dev, size, vaddr, bus, attrs); |
| } |
| |
| #endif |