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dma-mapping.h
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dma-mapping.h
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#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 <linux/dma-contiguous.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) { #ifndef CONFIG_X86_DEV_DMA_OPS return dma_ops; #else if (unlikely(!dev) || !dev->archdata.dma_ops) return dma_ops; else return dev->archdata.dma_ops; #endif } bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp); #define arch_dma_alloc_attrs arch_dma_alloc_attrs #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); debug_dma_mapping_error(dev, dma_addr); if (ops->mapping_error) return ops->mapping_error(dev, dma_addr); return (dma_addr == DMA_ERROR_CODE); } 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); extern void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_addr, struct dma_attrs *attrs); #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */ extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size); extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr); extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr); #else 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; } #endif /* CONFIG_X86_DMA_REMAP */ 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; } #endif
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