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>
12 #include <linux/dma-attrs.h>
14 #include <asm/swiotlb.h>
15 #include <linux/dma-contiguous.h>
18 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
20 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
23 #define DMA_ERROR_CODE 0
25 extern int iommu_merge;
26 extern struct device x86_dma_fallback_dev;
27 extern int panic_on_overflow;
29 extern struct dma_map_ops *dma_ops;
31 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
33 #ifndef CONFIG_X86_DEV_DMA_OPS
36 if (unlikely(!dev) || !dev->archdata.dma_ops)
39 return dev->archdata.dma_ops;
43 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
44 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
46 #include <asm-generic/dma-mapping-common.h>
48 /* Make sure we keep the same behaviour */
49 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
51 struct dma_map_ops *ops = get_dma_ops(dev);
52 debug_dma_mapping_error(dev, dma_addr);
53 if (ops->mapping_error)
54 return ops->mapping_error(dev, dma_addr);
56 return (dma_addr == DMA_ERROR_CODE);
59 extern int dma_supported(struct device *hwdev, u64 mask);
60 extern int dma_set_mask(struct device *dev, u64 mask);
62 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
63 dma_addr_t *dma_addr, gfp_t flag,
64 struct dma_attrs *attrs);
66 extern void dma_generic_free_coherent(struct device *dev, size_t size,
67 void *vaddr, dma_addr_t dma_addr,
68 struct dma_attrs *attrs);
70 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
71 extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
72 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
73 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
76 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
81 return addr + size - 1 <= *dev->dma_mask;
84 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
89 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
93 #endif /* CONFIG_X86_DMA_REMAP */
96 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
97 enum dma_data_direction dir)
99 flush_write_buffers();
102 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
105 unsigned long dma_mask = 0;
107 dma_mask = dev->coherent_dma_mask;
109 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
114 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
116 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
118 if (dma_mask <= DMA_BIT_MASK(24))
121 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))