1 #ifndef _ASM_X86_DMA_MAPPING_H
2 #define _ASM_X86_DMA_MAPPING_H
5 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
6 * Documentation/DMA-API.txt for documentation.
9 #include <linux/kmemcheck.h>
10 #include <linux/scatterlist.h>
11 #include <linux/dma-debug.h>
13 #include <asm/swiotlb.h>
14 #include <linux/dma-contiguous.h>
17 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
19 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
22 #define DMA_ERROR_CODE 0
24 extern int iommu_merge;
25 extern struct device x86_dma_fallback_dev;
26 extern int panic_on_overflow;
28 extern struct dma_map_ops *dma_ops;
30 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
32 #ifndef CONFIG_X86_DEV_DMA_OPS
35 if (unlikely(!dev) || !dev->archdata.dma_ops)
38 return dev->archdata.dma_ops;
42 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
43 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
45 #define HAVE_ARCH_DMA_SUPPORTED 1
46 extern int dma_supported(struct device *hwdev, u64 mask);
48 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
49 dma_addr_t *dma_addr, gfp_t flag,
52 extern void dma_generic_free_coherent(struct device *dev, size_t size,
53 void *vaddr, dma_addr_t dma_addr,
56 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
57 extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
58 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
59 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
62 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
67 return addr + size - 1 <= *dev->dma_mask;
70 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
75 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
79 #endif /* CONFIG_X86_DMA_REMAP */
82 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
83 enum dma_data_direction dir)
85 flush_write_buffers();
88 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
91 unsigned long dma_mask = 0;
93 dma_mask = dev->coherent_dma_mask;
95 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
100 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
102 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
104 if (dma_mask <= DMA_BIT_MASK(24))
107 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))