4035357f5b9d6b830a16b09f39d30e90810aae9e
[linux-2.6.git] / arch / x86 / include / asm / dma-mapping.h
1 #ifndef _ASM_X86_DMA_MAPPING_H
2 #define _ASM_X86_DMA_MAPPING_H
3
4 /*
5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
6  * documentation.
7  */
8
9 #include <linux/scatterlist.h>
10 #include <asm/io.h>
11 #include <asm/swiotlb.h>
12 #include <asm-generic/dma-coherent.h>
13
14 extern dma_addr_t bad_dma_address;
15 extern int iommu_merge;
16 extern struct device x86_dma_fallback_dev;
17 extern int panic_on_overflow;
18
19 struct dma_mapping_ops {
20         int             (*mapping_error)(struct device *dev,
21                                          dma_addr_t dma_addr);
22         void*           (*alloc_coherent)(struct device *dev, size_t size,
23                                 dma_addr_t *dma_handle, gfp_t gfp);
24         void            (*free_coherent)(struct device *dev, size_t size,
25                                 void *vaddr, dma_addr_t dma_handle);
26         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
27                                 size_t size, int direction);
28         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
29                                 size_t size, int direction);
30         void            (*sync_single_for_cpu)(struct device *hwdev,
31                                 dma_addr_t dma_handle, size_t size,
32                                 int direction);
33         void            (*sync_single_for_device)(struct device *hwdev,
34                                 dma_addr_t dma_handle, size_t size,
35                                 int direction);
36         void            (*sync_single_range_for_cpu)(struct device *hwdev,
37                                 dma_addr_t dma_handle, unsigned long offset,
38                                 size_t size, int direction);
39         void            (*sync_single_range_for_device)(struct device *hwdev,
40                                 dma_addr_t dma_handle, unsigned long offset,
41                                 size_t size, int direction);
42         void            (*sync_sg_for_cpu)(struct device *hwdev,
43                                 struct scatterlist *sg, int nelems,
44                                 int direction);
45         void            (*sync_sg_for_device)(struct device *hwdev,
46                                 struct scatterlist *sg, int nelems,
47                                 int direction);
48         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
49                                 int nents, int direction);
50         void            (*unmap_sg)(struct device *hwdev,
51                                 struct scatterlist *sg, int nents,
52                                 int direction);
53         int             (*dma_supported)(struct device *hwdev, u64 mask);
54         int             is_phys;
55 };
56
57 extern struct dma_mapping_ops *dma_ops;
58
59 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
60 {
61 #ifdef CONFIG_X86_32
62         return dma_ops;
63 #else
64         if (unlikely(!dev) || !dev->archdata.dma_ops)
65                 return dma_ops;
66         else
67                 return dev->archdata.dma_ops;
68 #endif
69 }
70
71 /* Make sure we keep the same behaviour */
72 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
73 {
74         struct dma_mapping_ops *ops = get_dma_ops(dev);
75         if (ops->mapping_error)
76                 return ops->mapping_error(dev, dma_addr);
77
78         return (dma_addr == bad_dma_address);
79 }
80
81 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
82 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
83 #define dma_is_consistent(d, h) (1)
84
85 extern int dma_supported(struct device *hwdev, u64 mask);
86 extern int dma_set_mask(struct device *dev, u64 mask);
87
88 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
89                                         dma_addr_t *dma_addr, gfp_t flag);
90
91 static inline dma_addr_t
92 dma_map_single(struct device *hwdev, void *ptr, size_t size,
93                int direction)
94 {
95         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
96
97         BUG_ON(!valid_dma_direction(direction));
98         return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
99 }
100
101 static inline void
102 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
103                  int direction)
104 {
105         struct dma_mapping_ops *ops = get_dma_ops(dev);
106
107         BUG_ON(!valid_dma_direction(direction));
108         if (ops->unmap_single)
109                 ops->unmap_single(dev, addr, size, direction);
110 }
111
112 static inline int
113 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
114            int nents, int direction)
115 {
116         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
117
118         BUG_ON(!valid_dma_direction(direction));
119         return ops->map_sg(hwdev, sg, nents, direction);
120 }
121
122 static inline void
123 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
124              int direction)
125 {
126         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
127
128         BUG_ON(!valid_dma_direction(direction));
129         if (ops->unmap_sg)
130                 ops->unmap_sg(hwdev, sg, nents, direction);
131 }
132
133 static inline void
134 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
135                         size_t size, int direction)
136 {
137         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
138
139         BUG_ON(!valid_dma_direction(direction));
140         if (ops->sync_single_for_cpu)
141                 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
142         flush_write_buffers();
143 }
144
145 static inline void
146 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
147                            size_t size, int direction)
148 {
149         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
150
151         BUG_ON(!valid_dma_direction(direction));
152         if (ops->sync_single_for_device)
153                 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
154         flush_write_buffers();
155 }
156
157 static inline void
158 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
159                               unsigned long offset, size_t size, int direction)
160 {
161         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
162
163         BUG_ON(!valid_dma_direction(direction));
164         if (ops->sync_single_range_for_cpu)
165                 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
166                                                size, direction);
167         flush_write_buffers();
168 }
169
170 static inline void
171 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
172                                  unsigned long offset, size_t size,
173                                  int direction)
174 {
175         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
176
177         BUG_ON(!valid_dma_direction(direction));
178         if (ops->sync_single_range_for_device)
179                 ops->sync_single_range_for_device(hwdev, dma_handle,
180                                                   offset, size, direction);
181         flush_write_buffers();
182 }
183
184 static inline void
185 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
186                     int nelems, int direction)
187 {
188         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
189
190         BUG_ON(!valid_dma_direction(direction));
191         if (ops->sync_sg_for_cpu)
192                 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
193         flush_write_buffers();
194 }
195
196 static inline void
197 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
198                        int nelems, int direction)
199 {
200         struct dma_mapping_ops *ops = get_dma_ops(hwdev);
201
202         BUG_ON(!valid_dma_direction(direction));
203         if (ops->sync_sg_for_device)
204                 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
205
206         flush_write_buffers();
207 }
208
209 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
210                                       size_t offset, size_t size,
211                                       int direction)
212 {
213         struct dma_mapping_ops *ops = get_dma_ops(dev);
214
215         BUG_ON(!valid_dma_direction(direction));
216         return ops->map_single(dev, page_to_phys(page) + offset,
217                                size, direction);
218 }
219
220 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
221                                   size_t size, int direction)
222 {
223         dma_unmap_single(dev, addr, size, direction);
224 }
225
226 static inline void
227 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
228         enum dma_data_direction dir)
229 {
230         flush_write_buffers();
231 }
232
233 static inline int dma_get_cache_alignment(void)
234 {
235         /* no easy way to get cache size on all x86, so return the
236          * maximum possible, to be safe */
237         return boot_cpu_data.x86_clflush_size;
238 }
239
240 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
241                                                     gfp_t gfp)
242 {
243         unsigned long dma_mask = 0;
244
245         dma_mask = dev->coherent_dma_mask;
246         if (!dma_mask)
247                 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
248
249         return dma_mask;
250 }
251
252 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
253 {
254         unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
255
256         if (dma_mask <= DMA_24BIT_MASK)
257                 gfp |= GFP_DMA;
258 #ifdef CONFIG_X86_64
259         if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
260                 gfp |= GFP_DMA32;
261 #endif
262        return gfp;
263 }
264
265 static inline void *
266 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
267                 gfp_t gfp)
268 {
269         struct dma_mapping_ops *ops = get_dma_ops(dev);
270         void *memory;
271
272         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
273
274         if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
275                 return memory;
276
277         if (!dev) {
278                 dev = &x86_dma_fallback_dev;
279                 gfp |= GFP_DMA;
280         }
281
282         if (!is_device_dma_capable(dev))
283                 return NULL;
284
285         if (!ops->alloc_coherent)
286                 return NULL;
287
288         return ops->alloc_coherent(dev, size, dma_handle,
289                                    dma_alloc_coherent_gfp_flags(dev, gfp));
290 }
291
292 static inline void dma_free_coherent(struct device *dev, size_t size,
293                                      void *vaddr, dma_addr_t bus)
294 {
295         struct dma_mapping_ops *ops = get_dma_ops(dev);
296
297         WARN_ON(irqs_disabled());       /* for portability */
298
299         if (dma_release_from_coherent(dev, get_order(size), vaddr))
300                 return;
301
302         if (ops->free_coherent)
303                 ops->free_coherent(dev, size, vaddr, bus);
304 }
305
306 #endif