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9ac7849e TH |
1 | /* |
2 | * drivers/base/dma-mapping.c - arch-independent dma-mapping routines | |
3 | * | |
4 | * Copyright (c) 2006 SUSE Linux Products GmbH | |
5 | * Copyright (c) 2006 Tejun Heo <teheo@suse.de> | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
9 | ||
10 | #include <linux/dma-mapping.h> | |
1b6bc32f | 11 | #include <linux/export.h> |
5a0e3ad6 | 12 | #include <linux/gfp.h> |
513510dd LA |
13 | #include <linux/slab.h> |
14 | #include <linux/vmalloc.h> | |
64ccc9c0 | 15 | #include <asm-generic/dma-coherent.h> |
9ac7849e TH |
16 | |
17 | /* | |
18 | * Managed DMA API | |
19 | */ | |
20 | struct dma_devres { | |
21 | size_t size; | |
22 | void *vaddr; | |
23 | dma_addr_t dma_handle; | |
24 | }; | |
25 | ||
26 | static void dmam_coherent_release(struct device *dev, void *res) | |
27 | { | |
28 | struct dma_devres *this = res; | |
29 | ||
30 | dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle); | |
31 | } | |
32 | ||
33 | static void dmam_noncoherent_release(struct device *dev, void *res) | |
34 | { | |
35 | struct dma_devres *this = res; | |
36 | ||
37 | dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle); | |
38 | } | |
39 | ||
40 | static int dmam_match(struct device *dev, void *res, void *match_data) | |
41 | { | |
42 | struct dma_devres *this = res, *match = match_data; | |
43 | ||
44 | if (this->vaddr == match->vaddr) { | |
45 | WARN_ON(this->size != match->size || | |
46 | this->dma_handle != match->dma_handle); | |
47 | return 1; | |
48 | } | |
49 | return 0; | |
50 | } | |
51 | ||
52 | /** | |
53 | * dmam_alloc_coherent - Managed dma_alloc_coherent() | |
54 | * @dev: Device to allocate coherent memory for | |
55 | * @size: Size of allocation | |
56 | * @dma_handle: Out argument for allocated DMA handle | |
57 | * @gfp: Allocation flags | |
58 | * | |
59 | * Managed dma_alloc_coherent(). Memory allocated using this function | |
60 | * will be automatically released on driver detach. | |
61 | * | |
62 | * RETURNS: | |
63 | * Pointer to allocated memory on success, NULL on failure. | |
64 | */ | |
65 | void * dmam_alloc_coherent(struct device *dev, size_t size, | |
66 | dma_addr_t *dma_handle, gfp_t gfp) | |
67 | { | |
68 | struct dma_devres *dr; | |
69 | void *vaddr; | |
70 | ||
71 | dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp); | |
72 | if (!dr) | |
73 | return NULL; | |
74 | ||
75 | vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp); | |
76 | if (!vaddr) { | |
77 | devres_free(dr); | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | dr->vaddr = vaddr; | |
82 | dr->dma_handle = *dma_handle; | |
83 | dr->size = size; | |
84 | ||
85 | devres_add(dev, dr); | |
86 | ||
87 | return vaddr; | |
88 | } | |
89 | EXPORT_SYMBOL(dmam_alloc_coherent); | |
90 | ||
91 | /** | |
92 | * dmam_free_coherent - Managed dma_free_coherent() | |
93 | * @dev: Device to free coherent memory for | |
94 | * @size: Size of allocation | |
95 | * @vaddr: Virtual address of the memory to free | |
96 | * @dma_handle: DMA handle of the memory to free | |
97 | * | |
98 | * Managed dma_free_coherent(). | |
99 | */ | |
100 | void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, | |
101 | dma_addr_t dma_handle) | |
102 | { | |
103 | struct dma_devres match_data = { size, vaddr, dma_handle }; | |
104 | ||
105 | dma_free_coherent(dev, size, vaddr, dma_handle); | |
106 | WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match, | |
107 | &match_data)); | |
108 | } | |
109 | EXPORT_SYMBOL(dmam_free_coherent); | |
110 | ||
111 | /** | |
112 | * dmam_alloc_non_coherent - Managed dma_alloc_non_coherent() | |
113 | * @dev: Device to allocate non_coherent memory for | |
114 | * @size: Size of allocation | |
115 | * @dma_handle: Out argument for allocated DMA handle | |
116 | * @gfp: Allocation flags | |
117 | * | |
118 | * Managed dma_alloc_non_coherent(). Memory allocated using this | |
119 | * function will be automatically released on driver detach. | |
120 | * | |
121 | * RETURNS: | |
122 | * Pointer to allocated memory on success, NULL on failure. | |
123 | */ | |
124 | void *dmam_alloc_noncoherent(struct device *dev, size_t size, | |
125 | dma_addr_t *dma_handle, gfp_t gfp) | |
126 | { | |
127 | struct dma_devres *dr; | |
128 | void *vaddr; | |
129 | ||
130 | dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp); | |
131 | if (!dr) | |
132 | return NULL; | |
133 | ||
134 | vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp); | |
135 | if (!vaddr) { | |
136 | devres_free(dr); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | dr->vaddr = vaddr; | |
141 | dr->dma_handle = *dma_handle; | |
142 | dr->size = size; | |
143 | ||
144 | devres_add(dev, dr); | |
145 | ||
146 | return vaddr; | |
147 | } | |
148 | EXPORT_SYMBOL(dmam_alloc_noncoherent); | |
149 | ||
150 | /** | |
151 | * dmam_free_coherent - Managed dma_free_noncoherent() | |
152 | * @dev: Device to free noncoherent memory for | |
153 | * @size: Size of allocation | |
154 | * @vaddr: Virtual address of the memory to free | |
155 | * @dma_handle: DMA handle of the memory to free | |
156 | * | |
157 | * Managed dma_free_noncoherent(). | |
158 | */ | |
159 | void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, | |
160 | dma_addr_t dma_handle) | |
161 | { | |
162 | struct dma_devres match_data = { size, vaddr, dma_handle }; | |
163 | ||
164 | dma_free_noncoherent(dev, size, vaddr, dma_handle); | |
165 | WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match, | |
166 | &match_data)); | |
167 | } | |
168 | EXPORT_SYMBOL(dmam_free_noncoherent); | |
169 | ||
170 | #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY | |
171 | ||
172 | static void dmam_coherent_decl_release(struct device *dev, void *res) | |
173 | { | |
174 | dma_release_declared_memory(dev); | |
175 | } | |
176 | ||
177 | /** | |
178 | * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory() | |
179 | * @dev: Device to declare coherent memory for | |
88a984ba | 180 | * @phys_addr: Physical address of coherent memory to be declared |
9ac7849e TH |
181 | * @device_addr: Device address of coherent memory to be declared |
182 | * @size: Size of coherent memory to be declared | |
183 | * @flags: Flags | |
184 | * | |
185 | * Managed dma_declare_coherent_memory(). | |
186 | * | |
187 | * RETURNS: | |
188 | * 0 on success, -errno on failure. | |
189 | */ | |
88a984ba | 190 | int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, |
9ac7849e TH |
191 | dma_addr_t device_addr, size_t size, int flags) |
192 | { | |
193 | void *res; | |
194 | int rc; | |
195 | ||
196 | res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL); | |
197 | if (!res) | |
198 | return -ENOMEM; | |
199 | ||
88a984ba | 200 | rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size, |
9ac7849e TH |
201 | flags); |
202 | if (rc == 0) | |
203 | devres_add(dev, res); | |
204 | else | |
205 | devres_free(res); | |
206 | ||
207 | return rc; | |
208 | } | |
209 | EXPORT_SYMBOL(dmam_declare_coherent_memory); | |
210 | ||
211 | /** | |
212 | * dmam_release_declared_memory - Managed dma_release_declared_memory(). | |
213 | * @dev: Device to release declared coherent memory for | |
214 | * | |
215 | * Managed dmam_release_declared_memory(). | |
216 | */ | |
217 | void dmam_release_declared_memory(struct device *dev) | |
218 | { | |
219 | WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL)); | |
220 | } | |
221 | EXPORT_SYMBOL(dmam_release_declared_memory); | |
222 | ||
c6c22955 MS |
223 | #endif |
224 | ||
d2b7428e MS |
225 | /* |
226 | * Create scatter-list for the already allocated DMA buffer. | |
227 | */ | |
228 | int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, | |
229 | void *cpu_addr, dma_addr_t handle, size_t size) | |
230 | { | |
231 | struct page *page = virt_to_page(cpu_addr); | |
232 | int ret; | |
233 | ||
234 | ret = sg_alloc_table(sgt, 1, GFP_KERNEL); | |
235 | if (unlikely(ret)) | |
236 | return ret; | |
237 | ||
238 | sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); | |
239 | return 0; | |
240 | } | |
241 | EXPORT_SYMBOL(dma_common_get_sgtable); | |
242 | ||
64ccc9c0 MS |
243 | /* |
244 | * Create userspace mapping for the DMA-coherent memory. | |
245 | */ | |
246 | int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, | |
247 | void *cpu_addr, dma_addr_t dma_addr, size_t size) | |
248 | { | |
249 | int ret = -ENXIO; | |
250 | #ifdef CONFIG_MMU | |
251 | unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
252 | unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; | |
253 | unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); | |
254 | unsigned long off = vma->vm_pgoff; | |
255 | ||
256 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
257 | ||
258 | if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) | |
259 | return ret; | |
260 | ||
261 | if (off < count && user_count <= (count - off)) { | |
262 | ret = remap_pfn_range(vma, vma->vm_start, | |
263 | pfn + off, | |
264 | user_count << PAGE_SHIFT, | |
265 | vma->vm_page_prot); | |
266 | } | |
267 | #endif /* CONFIG_MMU */ | |
268 | ||
269 | return ret; | |
270 | } | |
271 | EXPORT_SYMBOL(dma_common_mmap); | |
513510dd LA |
272 | |
273 | #ifdef CONFIG_MMU | |
274 | /* | |
275 | * remaps an array of PAGE_SIZE pages into another vm_area | |
276 | * Cannot be used in non-sleeping contexts | |
277 | */ | |
278 | void *dma_common_pages_remap(struct page **pages, size_t size, | |
279 | unsigned long vm_flags, pgprot_t prot, | |
280 | const void *caller) | |
281 | { | |
282 | struct vm_struct *area; | |
283 | ||
284 | area = get_vm_area_caller(size, vm_flags, caller); | |
285 | if (!area) | |
286 | return NULL; | |
287 | ||
288 | area->pages = pages; | |
289 | ||
290 | if (map_vm_area(area, prot, pages)) { | |
291 | vunmap(area->addr); | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | return area->addr; | |
296 | } | |
297 | ||
298 | /* | |
299 | * remaps an allocated contiguous region into another vm_area. | |
300 | * Cannot be used in non-sleeping contexts | |
301 | */ | |
302 | ||
303 | void *dma_common_contiguous_remap(struct page *page, size_t size, | |
304 | unsigned long vm_flags, | |
305 | pgprot_t prot, const void *caller) | |
306 | { | |
307 | int i; | |
308 | struct page **pages; | |
309 | void *ptr; | |
310 | unsigned long pfn; | |
311 | ||
312 | pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL); | |
313 | if (!pages) | |
314 | return NULL; | |
315 | ||
316 | for (i = 0, pfn = page_to_pfn(page); i < (size >> PAGE_SHIFT); i++) | |
317 | pages[i] = pfn_to_page(pfn + i); | |
318 | ||
319 | ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller); | |
320 | ||
321 | kfree(pages); | |
322 | ||
323 | return ptr; | |
324 | } | |
325 | ||
326 | /* | |
327 | * unmaps a range previously mapped by dma_common_*_remap | |
328 | */ | |
329 | void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags) | |
330 | { | |
331 | struct vm_struct *area = find_vm_area(cpu_addr); | |
332 | ||
333 | if (!area || (area->flags & vm_flags) != vm_flags) { | |
334 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); | |
335 | return; | |
336 | } | |
337 | ||
338 | unmap_kernel_range((unsigned long)cpu_addr, size); | |
339 | vunmap(cpu_addr); | |
340 | } | |
341 | #endif |