Commit | Line | Data |
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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 | ||
09515ef5 | 10 | #include <linux/acpi.h> |
9ac7849e | 11 | #include <linux/dma-mapping.h> |
1b6bc32f | 12 | #include <linux/export.h> |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
09515ef5 | 14 | #include <linux/of_device.h> |
513510dd LA |
15 | #include <linux/slab.h> |
16 | #include <linux/vmalloc.h> | |
9ac7849e TH |
17 | |
18 | /* | |
19 | * Managed DMA API | |
20 | */ | |
21 | struct dma_devres { | |
22 | size_t size; | |
23 | void *vaddr; | |
24 | dma_addr_t dma_handle; | |
25 | }; | |
26 | ||
27 | static void dmam_coherent_release(struct device *dev, void *res) | |
28 | { | |
29 | struct dma_devres *this = res; | |
30 | ||
31 | dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle); | |
32 | } | |
33 | ||
34 | static void dmam_noncoherent_release(struct device *dev, void *res) | |
35 | { | |
36 | struct dma_devres *this = res; | |
37 | ||
38 | dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle); | |
39 | } | |
40 | ||
41 | static int dmam_match(struct device *dev, void *res, void *match_data) | |
42 | { | |
43 | struct dma_devres *this = res, *match = match_data; | |
44 | ||
45 | if (this->vaddr == match->vaddr) { | |
46 | WARN_ON(this->size != match->size || | |
47 | this->dma_handle != match->dma_handle); | |
48 | return 1; | |
49 | } | |
50 | return 0; | |
51 | } | |
52 | ||
53 | /** | |
54 | * dmam_alloc_coherent - Managed dma_alloc_coherent() | |
55 | * @dev: Device to allocate coherent memory for | |
56 | * @size: Size of allocation | |
57 | * @dma_handle: Out argument for allocated DMA handle | |
58 | * @gfp: Allocation flags | |
59 | * | |
60 | * Managed dma_alloc_coherent(). Memory allocated using this function | |
61 | * will be automatically released on driver detach. | |
62 | * | |
63 | * RETURNS: | |
64 | * Pointer to allocated memory on success, NULL on failure. | |
65 | */ | |
6d42d79e | 66 | void *dmam_alloc_coherent(struct device *dev, size_t size, |
9ac7849e TH |
67 | dma_addr_t *dma_handle, gfp_t gfp) |
68 | { | |
69 | struct dma_devres *dr; | |
70 | void *vaddr; | |
71 | ||
72 | dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp); | |
73 | if (!dr) | |
74 | return NULL; | |
75 | ||
76 | vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp); | |
77 | if (!vaddr) { | |
78 | devres_free(dr); | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | dr->vaddr = vaddr; | |
83 | dr->dma_handle = *dma_handle; | |
84 | dr->size = size; | |
85 | ||
86 | devres_add(dev, dr); | |
87 | ||
88 | return vaddr; | |
89 | } | |
90 | EXPORT_SYMBOL(dmam_alloc_coherent); | |
91 | ||
92 | /** | |
93 | * dmam_free_coherent - Managed dma_free_coherent() | |
94 | * @dev: Device to free coherent memory for | |
95 | * @size: Size of allocation | |
96 | * @vaddr: Virtual address of the memory to free | |
97 | * @dma_handle: DMA handle of the memory to free | |
98 | * | |
99 | * Managed dma_free_coherent(). | |
100 | */ | |
101 | void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, | |
102 | dma_addr_t dma_handle) | |
103 | { | |
104 | struct dma_devres match_data = { size, vaddr, dma_handle }; | |
105 | ||
106 | dma_free_coherent(dev, size, vaddr, dma_handle); | |
107 | WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match, | |
108 | &match_data)); | |
109 | } | |
110 | EXPORT_SYMBOL(dmam_free_coherent); | |
111 | ||
112 | /** | |
cd74da95 | 113 | * dmam_alloc_non_coherent - Managed dma_alloc_noncoherent() |
9ac7849e TH |
114 | * @dev: Device to allocate non_coherent memory for |
115 | * @size: Size of allocation | |
116 | * @dma_handle: Out argument for allocated DMA handle | |
117 | * @gfp: Allocation flags | |
118 | * | |
cd74da95 | 119 | * Managed dma_alloc_noncoherent(). Memory allocated using this |
9ac7849e TH |
120 | * function will be automatically released on driver detach. |
121 | * | |
122 | * RETURNS: | |
123 | * Pointer to allocated memory on success, NULL on failure. | |
124 | */ | |
125 | void *dmam_alloc_noncoherent(struct device *dev, size_t size, | |
126 | dma_addr_t *dma_handle, gfp_t gfp) | |
127 | { | |
128 | struct dma_devres *dr; | |
129 | void *vaddr; | |
130 | ||
131 | dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp); | |
132 | if (!dr) | |
133 | return NULL; | |
134 | ||
135 | vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp); | |
136 | if (!vaddr) { | |
137 | devres_free(dr); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | dr->vaddr = vaddr; | |
142 | dr->dma_handle = *dma_handle; | |
143 | dr->size = size; | |
144 | ||
145 | devres_add(dev, dr); | |
146 | ||
147 | return vaddr; | |
148 | } | |
149 | EXPORT_SYMBOL(dmam_alloc_noncoherent); | |
150 | ||
151 | /** | |
152 | * dmam_free_coherent - Managed dma_free_noncoherent() | |
153 | * @dev: Device to free noncoherent memory for | |
154 | * @size: Size of allocation | |
155 | * @vaddr: Virtual address of the memory to free | |
156 | * @dma_handle: DMA handle of the memory to free | |
157 | * | |
158 | * Managed dma_free_noncoherent(). | |
159 | */ | |
160 | void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, | |
161 | dma_addr_t dma_handle) | |
162 | { | |
163 | struct dma_devres match_data = { size, vaddr, dma_handle }; | |
164 | ||
165 | dma_free_noncoherent(dev, size, vaddr, dma_handle); | |
166 | WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match, | |
167 | &match_data)); | |
168 | } | |
169 | EXPORT_SYMBOL(dmam_free_noncoherent); | |
170 | ||
20d666e4 | 171 | #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT |
9ac7849e TH |
172 | |
173 | static void dmam_coherent_decl_release(struct device *dev, void *res) | |
174 | { | |
175 | dma_release_declared_memory(dev); | |
176 | } | |
177 | ||
178 | /** | |
179 | * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory() | |
180 | * @dev: Device to declare coherent memory for | |
88a984ba | 181 | * @phys_addr: Physical address of coherent memory to be declared |
9ac7849e TH |
182 | * @device_addr: Device address of coherent memory to be declared |
183 | * @size: Size of coherent memory to be declared | |
184 | * @flags: Flags | |
185 | * | |
186 | * Managed dma_declare_coherent_memory(). | |
187 | * | |
188 | * RETURNS: | |
189 | * 0 on success, -errno on failure. | |
190 | */ | |
88a984ba | 191 | int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, |
9ac7849e TH |
192 | dma_addr_t device_addr, size_t size, int flags) |
193 | { | |
194 | void *res; | |
195 | int rc; | |
196 | ||
197 | res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL); | |
198 | if (!res) | |
199 | return -ENOMEM; | |
200 | ||
88a984ba | 201 | rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size, |
9ac7849e | 202 | flags); |
775115c0 | 203 | if (rc) { |
9ac7849e | 204 | devres_add(dev, res); |
775115c0 VY |
205 | rc = 0; |
206 | } else { | |
9ac7849e | 207 | devres_free(res); |
775115c0 VY |
208 | rc = -ENOMEM; |
209 | } | |
9ac7849e TH |
210 | |
211 | return rc; | |
212 | } | |
213 | EXPORT_SYMBOL(dmam_declare_coherent_memory); | |
214 | ||
215 | /** | |
216 | * dmam_release_declared_memory - Managed dma_release_declared_memory(). | |
217 | * @dev: Device to release declared coherent memory for | |
218 | * | |
219 | * Managed dmam_release_declared_memory(). | |
220 | */ | |
221 | void dmam_release_declared_memory(struct device *dev) | |
222 | { | |
223 | WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL)); | |
224 | } | |
225 | EXPORT_SYMBOL(dmam_release_declared_memory); | |
226 | ||
c6c22955 MS |
227 | #endif |
228 | ||
d2b7428e MS |
229 | /* |
230 | * Create scatter-list for the already allocated DMA buffer. | |
231 | */ | |
232 | int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, | |
233 | void *cpu_addr, dma_addr_t handle, size_t size) | |
234 | { | |
235 | struct page *page = virt_to_page(cpu_addr); | |
236 | int ret; | |
237 | ||
238 | ret = sg_alloc_table(sgt, 1, GFP_KERNEL); | |
239 | if (unlikely(ret)) | |
240 | return ret; | |
241 | ||
242 | sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); | |
243 | return 0; | |
244 | } | |
245 | EXPORT_SYMBOL(dma_common_get_sgtable); | |
246 | ||
64ccc9c0 MS |
247 | /* |
248 | * Create userspace mapping for the DMA-coherent memory. | |
249 | */ | |
250 | int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, | |
251 | void *cpu_addr, dma_addr_t dma_addr, size_t size) | |
252 | { | |
253 | int ret = -ENXIO; | |
0d4a619b | 254 | #if defined(CONFIG_MMU) && !defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) |
95da00e3 | 255 | unsigned long user_count = vma_pages(vma); |
64ccc9c0 MS |
256 | unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; |
257 | unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); | |
258 | unsigned long off = vma->vm_pgoff; | |
259 | ||
260 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
261 | ||
262 | if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) | |
263 | return ret; | |
264 | ||
265 | if (off < count && user_count <= (count - off)) { | |
266 | ret = remap_pfn_range(vma, vma->vm_start, | |
267 | pfn + off, | |
268 | user_count << PAGE_SHIFT, | |
269 | vma->vm_page_prot); | |
270 | } | |
0d4a619b | 271 | #endif /* CONFIG_MMU && !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ |
64ccc9c0 MS |
272 | |
273 | return ret; | |
274 | } | |
275 | EXPORT_SYMBOL(dma_common_mmap); | |
513510dd LA |
276 | |
277 | #ifdef CONFIG_MMU | |
278 | /* | |
279 | * remaps an array of PAGE_SIZE pages into another vm_area | |
280 | * Cannot be used in non-sleeping contexts | |
281 | */ | |
282 | void *dma_common_pages_remap(struct page **pages, size_t size, | |
283 | unsigned long vm_flags, pgprot_t prot, | |
284 | const void *caller) | |
285 | { | |
286 | struct vm_struct *area; | |
287 | ||
288 | area = get_vm_area_caller(size, vm_flags, caller); | |
289 | if (!area) | |
290 | return NULL; | |
291 | ||
292 | area->pages = pages; | |
293 | ||
294 | if (map_vm_area(area, prot, pages)) { | |
295 | vunmap(area->addr); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | return area->addr; | |
300 | } | |
301 | ||
302 | /* | |
303 | * remaps an allocated contiguous region into another vm_area. | |
304 | * Cannot be used in non-sleeping contexts | |
305 | */ | |
306 | ||
307 | void *dma_common_contiguous_remap(struct page *page, size_t size, | |
308 | unsigned long vm_flags, | |
309 | pgprot_t prot, const void *caller) | |
310 | { | |
311 | int i; | |
312 | struct page **pages; | |
313 | void *ptr; | |
513510dd LA |
314 | |
315 | pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL); | |
316 | if (!pages) | |
317 | return NULL; | |
318 | ||
0dd89119 GT |
319 | for (i = 0; i < (size >> PAGE_SHIFT); i++) |
320 | pages[i] = nth_page(page, i); | |
513510dd LA |
321 | |
322 | ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller); | |
323 | ||
324 | kfree(pages); | |
325 | ||
326 | return ptr; | |
327 | } | |
328 | ||
329 | /* | |
330 | * unmaps a range previously mapped by dma_common_*_remap | |
331 | */ | |
332 | void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags) | |
333 | { | |
334 | struct vm_struct *area = find_vm_area(cpu_addr); | |
335 | ||
336 | if (!area || (area->flags & vm_flags) != vm_flags) { | |
337 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); | |
338 | return; | |
339 | } | |
340 | ||
85714108 | 341 | unmap_kernel_range((unsigned long)cpu_addr, PAGE_ALIGN(size)); |
513510dd LA |
342 | vunmap(cpu_addr); |
343 | } | |
344 | #endif | |
09515ef5 S |
345 | |
346 | /* | |
347 | * Common configuration to enable DMA API use for a device | |
348 | */ | |
349 | #include <linux/pci.h> | |
350 | ||
351 | int dma_configure(struct device *dev) | |
352 | { | |
353 | struct device *bridge = NULL, *dma_dev = dev; | |
354 | enum dev_dma_attr attr; | |
7b07cbef | 355 | int ret = 0; |
09515ef5 S |
356 | |
357 | if (dev_is_pci(dev)) { | |
358 | bridge = pci_get_host_bridge_device(to_pci_dev(dev)); | |
359 | dma_dev = bridge; | |
360 | if (IS_ENABLED(CONFIG_OF) && dma_dev->parent && | |
361 | dma_dev->parent->of_node) | |
362 | dma_dev = dma_dev->parent; | |
363 | } | |
364 | ||
365 | if (dma_dev->of_node) { | |
7b07cbef | 366 | ret = of_dma_configure(dev, dma_dev->of_node); |
09515ef5 S |
367 | } else if (has_acpi_companion(dma_dev)) { |
368 | attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode)); | |
369 | if (attr != DEV_DMA_NOT_SUPPORTED) | |
5a1bb638 | 370 | ret = acpi_dma_configure(dev, attr); |
09515ef5 S |
371 | } |
372 | ||
373 | if (bridge) | |
374 | pci_put_host_bridge_device(bridge); | |
375 | ||
7b07cbef | 376 | return ret; |
09515ef5 S |
377 | } |
378 | ||
379 | void dma_deconfigure(struct device *dev) | |
380 | { | |
381 | of_dma_deconfigure(dev); | |
382 | acpi_dma_deconfigure(dev); | |
383 | } |