1#ifndef _ASM_X86_DMA_MAPPING_H
2#define _ASM_X86_DMA_MAPPING_H
3
4
5
6
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
14extern dma_addr_t bad_dma_address;
15extern int iommu_merge;
16extern struct device x86_dma_fallback_dev;
17extern int panic_on_overflow;
18
19struct 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
57extern struct dma_mapping_ops *dma_ops;
58
59static 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
72static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
73{
74#ifdef CONFIG_X86_64
75 struct dma_mapping_ops *ops = get_dma_ops(dev);
76 if (ops->mapping_error)
77 return ops->mapping_error(dev, dma_addr);
78
79#endif
80 return (dma_addr == bad_dma_address);
81}
82
83#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
84#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
85#define dma_is_consistent(d, h) (1)
86
87extern int dma_supported(struct device *hwdev, u64 mask);
88extern int dma_set_mask(struct device *dev, u64 mask);
89
90extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
91 dma_addr_t *dma_addr, gfp_t flag);
92
93static inline dma_addr_t
94dma_map_single(struct device *hwdev, void *ptr, size_t size,
95 int direction)
96{
97 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
98
99 BUG_ON(!valid_dma_direction(direction));
100 return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
101}
102
103static inline void
104dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
105 int direction)
106{
107 struct dma_mapping_ops *ops = get_dma_ops(dev);
108
109 BUG_ON(!valid_dma_direction(direction));
110 if (ops->unmap_single)
111 ops->unmap_single(dev, addr, size, direction);
112}
113
114static inline int
115dma_map_sg(struct device *hwdev, struct scatterlist *sg,
116 int nents, int direction)
117{
118 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
119
120 BUG_ON(!valid_dma_direction(direction));
121 return ops->map_sg(hwdev, sg, nents, direction);
122}
123
124static inline void
125dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
126 int direction)
127{
128 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
129
130 BUG_ON(!valid_dma_direction(direction));
131 if (ops->unmap_sg)
132 ops->unmap_sg(hwdev, sg, nents, direction);
133}
134
135static inline void
136dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
137 size_t size, int direction)
138{
139 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
140
141 BUG_ON(!valid_dma_direction(direction));
142 if (ops->sync_single_for_cpu)
143 ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
144 flush_write_buffers();
145}
146
147static inline void
148dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
149 size_t size, int direction)
150{
151 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
152
153 BUG_ON(!valid_dma_direction(direction));
154 if (ops->sync_single_for_device)
155 ops->sync_single_for_device(hwdev, dma_handle, size, direction);
156 flush_write_buffers();
157}
158
159static inline void
160dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
161 unsigned long offset, size_t size, int direction)
162{
163 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
164
165 BUG_ON(!valid_dma_direction(direction));
166 if (ops->sync_single_range_for_cpu)
167 ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
168 size, direction);
169 flush_write_buffers();
170}
171
172static inline void
173dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
174 unsigned long offset, size_t size,
175 int direction)
176{
177 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
178
179 BUG_ON(!valid_dma_direction(direction));
180 if (ops->sync_single_range_for_device)
181 ops->sync_single_range_for_device(hwdev, dma_handle,
182 offset, size, direction);
183 flush_write_buffers();
184}
185
186static inline void
187dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
188 int nelems, int direction)
189{
190 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
191
192 BUG_ON(!valid_dma_direction(direction));
193 if (ops->sync_sg_for_cpu)
194 ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
195 flush_write_buffers();
196}
197
198static inline void
199dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
200 int nelems, int direction)
201{
202 struct dma_mapping_ops *ops = get_dma_ops(hwdev);
203
204 BUG_ON(!valid_dma_direction(direction));
205 if (ops->sync_sg_for_device)
206 ops->sync_sg_for_device(hwdev, sg, nelems, direction);
207
208 flush_write_buffers();
209}
210
211static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
212 size_t offset, size_t size,
213 int direction)
214{
215 struct dma_mapping_ops *ops = get_dma_ops(dev);
216
217 BUG_ON(!valid_dma_direction(direction));
218 return ops->map_single(dev, page_to_phys(page) + offset,
219 size, direction);
220}
221
222static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
223 size_t size, int direction)
224{
225 dma_unmap_single(dev, addr, size, direction);
226}
227
228static inline void
229dma_cache_sync(struct device *dev, void *vaddr, size_t size,
230 enum dma_data_direction dir)
231{
232 flush_write_buffers();
233}
234
235static inline int dma_get_cache_alignment(void)
236{
237
238
239 return boot_cpu_data.x86_clflush_size;
240}
241
242static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
243 gfp_t gfp)
244{
245 unsigned long dma_mask = 0;
246
247 dma_mask = dev->coherent_dma_mask;
248 if (!dma_mask)
249 dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK;
250
251 return dma_mask;
252}
253
254static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
255{
256 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
257
258 if (dma_mask <= DMA_24BIT_MASK)
259 gfp |= GFP_DMA;
260#ifdef CONFIG_X86_64
261 if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
262 gfp |= GFP_DMA32;
263#endif
264 return gfp;
265}
266
267static inline void *
268dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
269 gfp_t gfp)
270{
271 struct dma_mapping_ops *ops = get_dma_ops(dev);
272 void *memory;
273
274 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
275
276 if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
277 return memory;
278
279 if (!dev) {
280 dev = &x86_dma_fallback_dev;
281 gfp |= GFP_DMA;
282 }
283
284 if (!is_device_dma_capable(dev))
285 return NULL;
286
287 if (!ops->alloc_coherent)
288 return NULL;
289
290 return ops->alloc_coherent(dev, size, dma_handle,
291 dma_alloc_coherent_gfp_flags(dev, gfp));
292}
293
294static inline void dma_free_coherent(struct device *dev, size_t size,
295 void *vaddr, dma_addr_t bus)
296{
297 struct dma_mapping_ops *ops = get_dma_ops(dev);
298
299 WARN_ON(irqs_disabled());
300
301 if (dma_release_from_coherent(dev, get_order(size), vaddr))
302 return;
303
304 if (ops->free_coherent)
305 ops->free_coherent(dev, size, vaddr, bus);
306}
307
308#endif
309
