1 #ifndef _ASM_X86_DMA_MAPPING_H
2 #define _ASM_X86_DMA_MAPPING_H
3
4 /*
5 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
6 * Documentation/DMA-API.txt for documentation.
7 */
8
9 #include <linux/kmemcheck.h>
10 #include <linux/scatterlist.h>
11 #include <linux/dma-debug.h>
12 #include <asm/io.h>
13 #include <asm/swiotlb.h>
14 #include <linux/dma-contiguous.h>
15
16 #ifdef CONFIG_ISA
17 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
18 #else
19 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
20 #endif
21
22 #define DMA_ERROR_CODE 0
23
24 extern int iommu_merge;
25 extern struct device x86_dma_fallback_dev;
26 extern int panic_on_overflow;
27
28 extern struct dma_map_ops *dma_ops;
29
get_dma_ops(struct device * dev)30 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
31 {
32 #ifndef CONFIG_X86_DEV_DMA_OPS
33 return dma_ops;
34 #else
35 if (unlikely(!dev) || !dev->archdata.dma_ops)
36 return dma_ops;
37 else
38 return dev->archdata.dma_ops;
39 #endif
40 }
41
42 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
43 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
44
45 #define HAVE_ARCH_DMA_SUPPORTED 1
46 extern int dma_supported(struct device *hwdev, u64 mask);
47
48 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
49 dma_addr_t *dma_addr, gfp_t flag,
50 unsigned long attrs);
51
52 extern void dma_generic_free_coherent(struct device *dev, size_t size,
53 void *vaddr, dma_addr_t dma_addr,
54 unsigned long attrs);
55
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);
60 #else
61
dma_capable(struct device * dev,dma_addr_t addr,size_t size)62 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
63 {
64 if (!dev->dma_mask)
65 return 0;
66
67 return addr + size - 1 <= *dev->dma_mask;
68 }
69
phys_to_dma(struct device * dev,phys_addr_t paddr)70 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
71 {
72 return paddr;
73 }
74
dma_to_phys(struct device * dev,dma_addr_t daddr)75 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
76 {
77 return daddr;
78 }
79 #endif /* CONFIG_X86_DMA_REMAP */
80
81 static inline void
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction dir)82 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
83 enum dma_data_direction dir)
84 {
85 flush_write_buffers();
86 }
87
dma_alloc_coherent_mask(struct device * dev,gfp_t gfp)88 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
89 gfp_t gfp)
90 {
91 unsigned long dma_mask = 0;
92
93 dma_mask = dev->coherent_dma_mask;
94 if (!dma_mask)
95 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
96
97 return dma_mask;
98 }
99
dma_alloc_coherent_gfp_flags(struct device * dev,gfp_t gfp)100 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
101 {
102 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
103
104 if (dma_mask <= DMA_BIT_MASK(24))
105 gfp |= GFP_DMA;
106 #ifdef CONFIG_X86_64
107 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
108 gfp |= GFP_DMA32;
109 #endif
110 return gfp;
111 }
112
113 #endif
114