1#ifndef _ASM_X86_DMA_MAPPING_H
2#define _ASM_X86_DMA_MAPPING_H
3
4
5
6
7
8
9#include <linux/kmemcheck.h>
10#include <linux/scatterlist.h>
11#include <linux/dma-debug.h>
12#include <linux/dma-attrs.h>
13#include <asm/io.h>
14#include <asm/swiotlb.h>
15#include <asm-generic/dma-coherent.h>
16#include <linux/dma-contiguous.h>
17
18#ifdef CONFIG_ISA
19# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
20#else
21# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
22#endif
23
24#define DMA_ERROR_CODE 0
25
26extern int iommu_merge;
27extern struct device x86_dma_fallback_dev;
28extern int panic_on_overflow;
29
30extern struct dma_map_ops *dma_ops;
31
32static inline struct dma_map_ops *get_dma_ops(struct device *dev)
33{
34#ifndef CONFIG_X86_DEV_DMA_OPS
35 return dma_ops;
36#else
37 if (unlikely(!dev) || !dev->archdata.dma_ops)
38 return dma_ops;
39 else
40 return dev->archdata.dma_ops;
41#endif
42}
43
44#include <asm-generic/dma-mapping-common.h>
45
46
47static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
48{
49 struct dma_map_ops *ops = get_dma_ops(dev);
50 if (ops->mapping_error)
51 return ops->mapping_error(dev, dma_addr);
52
53 return (dma_addr == DMA_ERROR_CODE);
54}
55
56#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
57#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
58
59extern int dma_supported(struct device *hwdev, u64 mask);
60extern int dma_set_mask(struct device *dev, u64 mask);
61
62extern 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);
65
66extern void dma_generic_free_coherent(struct device *dev, size_t size,
67 void *vaddr, dma_addr_t dma_addr,
68 struct dma_attrs *attrs);
69
70#ifdef CONFIG_X86_DMA_REMAP
71extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
72extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
73extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
74#else
75
76static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
77{
78 if (!dev->dma_mask)
79 return 0;
80
81 return addr + size - 1 <= *dev->dma_mask;
82}
83
84static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
85{
86 return paddr;
87}
88
89static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
90{
91 return daddr;
92}
93#endif
94
95static inline void
96dma_cache_sync(struct device *dev, void *vaddr, size_t size,
97 enum dma_data_direction dir)
98{
99 flush_write_buffers();
100}
101
102static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
103 gfp_t gfp)
104{
105 unsigned long dma_mask = 0;
106
107 dma_mask = dev->coherent_dma_mask;
108 if (!dma_mask)
109 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
110
111 return dma_mask;
112}
113
114static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
115{
116 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
117
118 if (dma_mask <= DMA_BIT_MASK(24))
119 gfp |= GFP_DMA;
120#ifdef CONFIG_X86_64
121 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
122 gfp |= GFP_DMA32;
123#endif
124 return gfp;
125}
126
127#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
128
129static inline void *
130dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
131 gfp_t gfp, struct dma_attrs *attrs)
132{
133 struct dma_map_ops *ops = get_dma_ops(dev);
134 void *memory;
135
136 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
137
138 if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
139 return memory;
140
141 if (!dev)
142 dev = &x86_dma_fallback_dev;
143
144 if (!is_device_dma_capable(dev))
145 return NULL;
146
147 if (!ops->alloc)
148 return NULL;
149
150 memory = ops->alloc(dev, size, dma_handle,
151 dma_alloc_coherent_gfp_flags(dev, gfp), attrs);
152 debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
153
154 return memory;
155}
156
157#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
158
159static inline void dma_free_attrs(struct device *dev, size_t size,
160 void *vaddr, dma_addr_t bus,
161 struct dma_attrs *attrs)
162{
163 struct dma_map_ops *ops = get_dma_ops(dev);
164
165 WARN_ON(irqs_disabled());
166
167 if (dma_release_from_coherent(dev, get_order(size), vaddr))
168 return;
169
170 debug_dma_free_coherent(dev, size, vaddr, bus);
171 if (ops->free)
172 ops->free(dev, size, vaddr, bus, attrs);
173}
174
175#endif
176