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d15bd7ee SS |
1 | /* |
2 | * Framework for buffer objects that can be shared across devices/subsystems. | |
3 | * | |
4 | * Copyright(C) 2011 Linaro Limited. All rights reserved. | |
5 | * Author: Sumit Semwal <sumit.semwal@ti.com> | |
6 | * | |
7 | * Many thanks to linaro-mm-sig list, and specially | |
8 | * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and | |
9 | * Daniel Vetter <daniel@ffwll.ch> for their support in creation and | |
10 | * refining of this idea. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License version 2 as published by | |
14 | * the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
19 | * more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along with | |
22 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
23 | */ | |
24 | ||
25 | #include <linux/fs.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/dma-buf.h> | |
28 | #include <linux/anon_inodes.h> | |
29 | #include <linux/export.h> | |
b89e3563 SS |
30 | #include <linux/debugfs.h> |
31 | #include <linux/seq_file.h> | |
d15bd7ee SS |
32 | |
33 | static inline int is_dma_buf_file(struct file *); | |
34 | ||
b89e3563 SS |
35 | struct dma_buf_list { |
36 | struct list_head head; | |
37 | struct mutex lock; | |
38 | }; | |
39 | ||
40 | static struct dma_buf_list db_list; | |
41 | ||
d15bd7ee SS |
42 | static int dma_buf_release(struct inode *inode, struct file *file) |
43 | { | |
44 | struct dma_buf *dmabuf; | |
45 | ||
46 | if (!is_dma_buf_file(file)) | |
47 | return -EINVAL; | |
48 | ||
49 | dmabuf = file->private_data; | |
50 | ||
f00b4dad DV |
51 | BUG_ON(dmabuf->vmapping_counter); |
52 | ||
d15bd7ee | 53 | dmabuf->ops->release(dmabuf); |
b89e3563 SS |
54 | |
55 | mutex_lock(&db_list.lock); | |
56 | list_del(&dmabuf->list_node); | |
57 | mutex_unlock(&db_list.lock); | |
58 | ||
d15bd7ee SS |
59 | kfree(dmabuf); |
60 | return 0; | |
61 | } | |
62 | ||
4c78513e DV |
63 | static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) |
64 | { | |
65 | struct dma_buf *dmabuf; | |
66 | ||
67 | if (!is_dma_buf_file(file)) | |
68 | return -EINVAL; | |
69 | ||
70 | dmabuf = file->private_data; | |
71 | ||
72 | /* check for overflowing the buffer's size */ | |
73 | if (vma->vm_pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > | |
74 | dmabuf->size >> PAGE_SHIFT) | |
75 | return -EINVAL; | |
76 | ||
77 | return dmabuf->ops->mmap(dmabuf, vma); | |
78 | } | |
79 | ||
d15bd7ee SS |
80 | static const struct file_operations dma_buf_fops = { |
81 | .release = dma_buf_release, | |
4c78513e | 82 | .mmap = dma_buf_mmap_internal, |
d15bd7ee SS |
83 | }; |
84 | ||
85 | /* | |
86 | * is_dma_buf_file - Check if struct file* is associated with dma_buf | |
87 | */ | |
88 | static inline int is_dma_buf_file(struct file *file) | |
89 | { | |
90 | return file->f_op == &dma_buf_fops; | |
91 | } | |
92 | ||
93 | /** | |
78df9695 | 94 | * dma_buf_export_named - Creates a new dma_buf, and associates an anon file |
d15bd7ee SS |
95 | * with this buffer, so it can be exported. |
96 | * Also connect the allocator specific data and ops to the buffer. | |
78df9695 | 97 | * Additionally, provide a name string for exporter; useful in debugging. |
d15bd7ee SS |
98 | * |
99 | * @priv: [in] Attach private data of allocator to this buffer | |
100 | * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. | |
101 | * @size: [in] Size of the buffer | |
102 | * @flags: [in] mode flags for the file. | |
78df9695 | 103 | * @exp_name: [in] name of the exporting module - useful for debugging. |
d15bd7ee SS |
104 | * |
105 | * Returns, on success, a newly created dma_buf object, which wraps the | |
106 | * supplied private data and operations for dma_buf_ops. On either missing | |
107 | * ops, or error in allocating struct dma_buf, will return negative error. | |
108 | * | |
109 | */ | |
78df9695 SS |
110 | struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, |
111 | size_t size, int flags, const char *exp_name) | |
d15bd7ee SS |
112 | { |
113 | struct dma_buf *dmabuf; | |
114 | struct file *file; | |
115 | ||
116 | if (WARN_ON(!priv || !ops | |
117 | || !ops->map_dma_buf | |
118 | || !ops->unmap_dma_buf | |
fc13020e DV |
119 | || !ops->release |
120 | || !ops->kmap_atomic | |
4c78513e DV |
121 | || !ops->kmap |
122 | || !ops->mmap)) { | |
d15bd7ee SS |
123 | return ERR_PTR(-EINVAL); |
124 | } | |
125 | ||
126 | dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); | |
127 | if (dmabuf == NULL) | |
128 | return ERR_PTR(-ENOMEM); | |
129 | ||
130 | dmabuf->priv = priv; | |
131 | dmabuf->ops = ops; | |
132 | dmabuf->size = size; | |
78df9695 | 133 | dmabuf->exp_name = exp_name; |
d15bd7ee SS |
134 | |
135 | file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); | |
136 | ||
137 | dmabuf->file = file; | |
138 | ||
139 | mutex_init(&dmabuf->lock); | |
140 | INIT_LIST_HEAD(&dmabuf->attachments); | |
141 | ||
b89e3563 SS |
142 | mutex_lock(&db_list.lock); |
143 | list_add(&dmabuf->list_node, &db_list.head); | |
144 | mutex_unlock(&db_list.lock); | |
145 | ||
d15bd7ee SS |
146 | return dmabuf; |
147 | } | |
78df9695 | 148 | EXPORT_SYMBOL_GPL(dma_buf_export_named); |
d15bd7ee SS |
149 | |
150 | ||
151 | /** | |
152 | * dma_buf_fd - returns a file descriptor for the given dma_buf | |
153 | * @dmabuf: [in] pointer to dma_buf for which fd is required. | |
55c1c4ca | 154 | * @flags: [in] flags to give to fd |
d15bd7ee SS |
155 | * |
156 | * On success, returns an associated 'fd'. Else, returns error. | |
157 | */ | |
55c1c4ca | 158 | int dma_buf_fd(struct dma_buf *dmabuf, int flags) |
d15bd7ee | 159 | { |
f5e097f0 | 160 | int fd; |
d15bd7ee SS |
161 | |
162 | if (!dmabuf || !dmabuf->file) | |
163 | return -EINVAL; | |
164 | ||
f5e097f0 BP |
165 | fd = get_unused_fd_flags(flags); |
166 | if (fd < 0) | |
167 | return fd; | |
d15bd7ee SS |
168 | |
169 | fd_install(fd, dmabuf->file); | |
170 | ||
171 | return fd; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(dma_buf_fd); | |
174 | ||
175 | /** | |
176 | * dma_buf_get - returns the dma_buf structure related to an fd | |
177 | * @fd: [in] fd associated with the dma_buf to be returned | |
178 | * | |
179 | * On success, returns the dma_buf structure associated with an fd; uses | |
180 | * file's refcounting done by fget to increase refcount. returns ERR_PTR | |
181 | * otherwise. | |
182 | */ | |
183 | struct dma_buf *dma_buf_get(int fd) | |
184 | { | |
185 | struct file *file; | |
186 | ||
187 | file = fget(fd); | |
188 | ||
189 | if (!file) | |
190 | return ERR_PTR(-EBADF); | |
191 | ||
192 | if (!is_dma_buf_file(file)) { | |
193 | fput(file); | |
194 | return ERR_PTR(-EINVAL); | |
195 | } | |
196 | ||
197 | return file->private_data; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(dma_buf_get); | |
200 | ||
201 | /** | |
202 | * dma_buf_put - decreases refcount of the buffer | |
203 | * @dmabuf: [in] buffer to reduce refcount of | |
204 | * | |
205 | * Uses file's refcounting done implicitly by fput() | |
206 | */ | |
207 | void dma_buf_put(struct dma_buf *dmabuf) | |
208 | { | |
209 | if (WARN_ON(!dmabuf || !dmabuf->file)) | |
210 | return; | |
211 | ||
212 | fput(dmabuf->file); | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(dma_buf_put); | |
215 | ||
216 | /** | |
217 | * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, | |
218 | * calls attach() of dma_buf_ops to allow device-specific attach functionality | |
219 | * @dmabuf: [in] buffer to attach device to. | |
220 | * @dev: [in] device to be attached. | |
221 | * | |
222 | * Returns struct dma_buf_attachment * for this attachment; may return negative | |
223 | * error codes. | |
224 | * | |
225 | */ | |
226 | struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, | |
227 | struct device *dev) | |
228 | { | |
229 | struct dma_buf_attachment *attach; | |
230 | int ret; | |
231 | ||
d1aa06a1 | 232 | if (WARN_ON(!dmabuf || !dev)) |
d15bd7ee SS |
233 | return ERR_PTR(-EINVAL); |
234 | ||
235 | attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); | |
236 | if (attach == NULL) | |
a9fbc3b7 | 237 | return ERR_PTR(-ENOMEM); |
d15bd7ee | 238 | |
d15bd7ee SS |
239 | attach->dev = dev; |
240 | attach->dmabuf = dmabuf; | |
2ed9201b LP |
241 | |
242 | mutex_lock(&dmabuf->lock); | |
243 | ||
d15bd7ee SS |
244 | if (dmabuf->ops->attach) { |
245 | ret = dmabuf->ops->attach(dmabuf, dev, attach); | |
246 | if (ret) | |
247 | goto err_attach; | |
248 | } | |
249 | list_add(&attach->node, &dmabuf->attachments); | |
250 | ||
251 | mutex_unlock(&dmabuf->lock); | |
252 | return attach; | |
253 | ||
d15bd7ee SS |
254 | err_attach: |
255 | kfree(attach); | |
256 | mutex_unlock(&dmabuf->lock); | |
257 | return ERR_PTR(ret); | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(dma_buf_attach); | |
260 | ||
261 | /** | |
262 | * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; | |
263 | * optionally calls detach() of dma_buf_ops for device-specific detach | |
264 | * @dmabuf: [in] buffer to detach from. | |
265 | * @attach: [in] attachment to be detached; is free'd after this call. | |
266 | * | |
267 | */ | |
268 | void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) | |
269 | { | |
d1aa06a1 | 270 | if (WARN_ON(!dmabuf || !attach)) |
d15bd7ee SS |
271 | return; |
272 | ||
273 | mutex_lock(&dmabuf->lock); | |
274 | list_del(&attach->node); | |
275 | if (dmabuf->ops->detach) | |
276 | dmabuf->ops->detach(dmabuf, attach); | |
277 | ||
278 | mutex_unlock(&dmabuf->lock); | |
279 | kfree(attach); | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(dma_buf_detach); | |
282 | ||
283 | /** | |
284 | * dma_buf_map_attachment - Returns the scatterlist table of the attachment; | |
285 | * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the | |
286 | * dma_buf_ops. | |
287 | * @attach: [in] attachment whose scatterlist is to be returned | |
288 | * @direction: [in] direction of DMA transfer | |
289 | * | |
290 | * Returns sg_table containing the scatterlist to be returned; may return NULL | |
291 | * or ERR_PTR. | |
292 | * | |
293 | */ | |
294 | struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, | |
295 | enum dma_data_direction direction) | |
296 | { | |
297 | struct sg_table *sg_table = ERR_PTR(-EINVAL); | |
298 | ||
299 | might_sleep(); | |
300 | ||
d1aa06a1 | 301 | if (WARN_ON(!attach || !attach->dmabuf)) |
d15bd7ee SS |
302 | return ERR_PTR(-EINVAL); |
303 | ||
d1aa06a1 | 304 | sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); |
d15bd7ee SS |
305 | |
306 | return sg_table; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(dma_buf_map_attachment); | |
309 | ||
310 | /** | |
311 | * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might | |
312 | * deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf() of | |
313 | * dma_buf_ops. | |
314 | * @attach: [in] attachment to unmap buffer from | |
315 | * @sg_table: [in] scatterlist info of the buffer to unmap | |
33ea2dcb | 316 | * @direction: [in] direction of DMA transfer |
d15bd7ee SS |
317 | * |
318 | */ | |
319 | void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, | |
33ea2dcb SS |
320 | struct sg_table *sg_table, |
321 | enum dma_data_direction direction) | |
d15bd7ee | 322 | { |
b6fa0cd6 RC |
323 | might_sleep(); |
324 | ||
d1aa06a1 | 325 | if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) |
d15bd7ee SS |
326 | return; |
327 | ||
33ea2dcb SS |
328 | attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, |
329 | direction); | |
d15bd7ee SS |
330 | } |
331 | EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); | |
fc13020e DV |
332 | |
333 | ||
334 | /** | |
335 | * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the | |
336 | * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific | |
337 | * preparations. Coherency is only guaranteed in the specified range for the | |
338 | * specified access direction. | |
efb4df82 | 339 | * @dmabuf: [in] buffer to prepare cpu access for. |
fc13020e DV |
340 | * @start: [in] start of range for cpu access. |
341 | * @len: [in] length of range for cpu access. | |
342 | * @direction: [in] length of range for cpu access. | |
343 | * | |
344 | * Can return negative error values, returns 0 on success. | |
345 | */ | |
346 | int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, | |
347 | enum dma_data_direction direction) | |
348 | { | |
349 | int ret = 0; | |
350 | ||
351 | if (WARN_ON(!dmabuf)) | |
352 | return -EINVAL; | |
353 | ||
354 | if (dmabuf->ops->begin_cpu_access) | |
355 | ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); | |
356 | ||
357 | return ret; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); | |
360 | ||
361 | /** | |
362 | * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the | |
363 | * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific | |
364 | * actions. Coherency is only guaranteed in the specified range for the | |
365 | * specified access direction. | |
efb4df82 | 366 | * @dmabuf: [in] buffer to complete cpu access for. |
fc13020e DV |
367 | * @start: [in] start of range for cpu access. |
368 | * @len: [in] length of range for cpu access. | |
369 | * @direction: [in] length of range for cpu access. | |
370 | * | |
371 | * This call must always succeed. | |
372 | */ | |
373 | void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, | |
374 | enum dma_data_direction direction) | |
375 | { | |
376 | WARN_ON(!dmabuf); | |
377 | ||
378 | if (dmabuf->ops->end_cpu_access) | |
379 | dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); | |
382 | ||
383 | /** | |
384 | * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address | |
385 | * space. The same restrictions as for kmap_atomic and friends apply. | |
efb4df82 | 386 | * @dmabuf: [in] buffer to map page from. |
fc13020e DV |
387 | * @page_num: [in] page in PAGE_SIZE units to map. |
388 | * | |
389 | * This call must always succeed, any necessary preparations that might fail | |
390 | * need to be done in begin_cpu_access. | |
391 | */ | |
392 | void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) | |
393 | { | |
394 | WARN_ON(!dmabuf); | |
395 | ||
396 | return dmabuf->ops->kmap_atomic(dmabuf, page_num); | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); | |
399 | ||
400 | /** | |
401 | * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. | |
efb4df82 | 402 | * @dmabuf: [in] buffer to unmap page from. |
fc13020e DV |
403 | * @page_num: [in] page in PAGE_SIZE units to unmap. |
404 | * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. | |
405 | * | |
406 | * This call must always succeed. | |
407 | */ | |
408 | void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, | |
409 | void *vaddr) | |
410 | { | |
411 | WARN_ON(!dmabuf); | |
412 | ||
413 | if (dmabuf->ops->kunmap_atomic) | |
414 | dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); | |
417 | ||
418 | /** | |
419 | * dma_buf_kmap - Map a page of the buffer object into kernel address space. The | |
420 | * same restrictions as for kmap and friends apply. | |
efb4df82 | 421 | * @dmabuf: [in] buffer to map page from. |
fc13020e DV |
422 | * @page_num: [in] page in PAGE_SIZE units to map. |
423 | * | |
424 | * This call must always succeed, any necessary preparations that might fail | |
425 | * need to be done in begin_cpu_access. | |
426 | */ | |
427 | void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) | |
428 | { | |
429 | WARN_ON(!dmabuf); | |
430 | ||
431 | return dmabuf->ops->kmap(dmabuf, page_num); | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(dma_buf_kmap); | |
434 | ||
435 | /** | |
436 | * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. | |
efb4df82 | 437 | * @dmabuf: [in] buffer to unmap page from. |
fc13020e DV |
438 | * @page_num: [in] page in PAGE_SIZE units to unmap. |
439 | * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. | |
440 | * | |
441 | * This call must always succeed. | |
442 | */ | |
443 | void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, | |
444 | void *vaddr) | |
445 | { | |
446 | WARN_ON(!dmabuf); | |
447 | ||
448 | if (dmabuf->ops->kunmap) | |
449 | dmabuf->ops->kunmap(dmabuf, page_num, vaddr); | |
450 | } | |
451 | EXPORT_SYMBOL_GPL(dma_buf_kunmap); | |
4c78513e DV |
452 | |
453 | ||
454 | /** | |
455 | * dma_buf_mmap - Setup up a userspace mmap with the given vma | |
12c4727e | 456 | * @dmabuf: [in] buffer that should back the vma |
4c78513e DV |
457 | * @vma: [in] vma for the mmap |
458 | * @pgoff: [in] offset in pages where this mmap should start within the | |
459 | * dma-buf buffer. | |
460 | * | |
461 | * This function adjusts the passed in vma so that it points at the file of the | |
462 | * dma_buf operation. It alsog adjusts the starting pgoff and does bounds | |
463 | * checking on the size of the vma. Then it calls the exporters mmap function to | |
464 | * set up the mapping. | |
465 | * | |
466 | * Can return negative error values, returns 0 on success. | |
467 | */ | |
468 | int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, | |
469 | unsigned long pgoff) | |
470 | { | |
495c10cc JS |
471 | struct file *oldfile; |
472 | int ret; | |
473 | ||
4c78513e DV |
474 | if (WARN_ON(!dmabuf || !vma)) |
475 | return -EINVAL; | |
476 | ||
477 | /* check for offset overflow */ | |
478 | if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < pgoff) | |
479 | return -EOVERFLOW; | |
480 | ||
481 | /* check for overflowing the buffer's size */ | |
482 | if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > | |
483 | dmabuf->size >> PAGE_SHIFT) | |
484 | return -EINVAL; | |
485 | ||
486 | /* readjust the vma */ | |
495c10cc JS |
487 | get_file(dmabuf->file); |
488 | oldfile = vma->vm_file; | |
489 | vma->vm_file = dmabuf->file; | |
4c78513e DV |
490 | vma->vm_pgoff = pgoff; |
491 | ||
495c10cc JS |
492 | ret = dmabuf->ops->mmap(dmabuf, vma); |
493 | if (ret) { | |
494 | /* restore old parameters on failure */ | |
495 | vma->vm_file = oldfile; | |
496 | fput(dmabuf->file); | |
497 | } else { | |
498 | if (oldfile) | |
499 | fput(oldfile); | |
500 | } | |
501 | return ret; | |
502 | ||
4c78513e DV |
503 | } |
504 | EXPORT_SYMBOL_GPL(dma_buf_mmap); | |
98f86c9e DA |
505 | |
506 | /** | |
12c4727e SS |
507 | * dma_buf_vmap - Create virtual mapping for the buffer object into kernel |
508 | * address space. Same restrictions as for vmap and friends apply. | |
509 | * @dmabuf: [in] buffer to vmap | |
98f86c9e DA |
510 | * |
511 | * This call may fail due to lack of virtual mapping address space. | |
512 | * These calls are optional in drivers. The intended use for them | |
513 | * is for mapping objects linear in kernel space for high use objects. | |
514 | * Please attempt to use kmap/kunmap before thinking about these interfaces. | |
515 | */ | |
516 | void *dma_buf_vmap(struct dma_buf *dmabuf) | |
517 | { | |
f00b4dad DV |
518 | void *ptr; |
519 | ||
98f86c9e DA |
520 | if (WARN_ON(!dmabuf)) |
521 | return NULL; | |
522 | ||
f00b4dad DV |
523 | if (!dmabuf->ops->vmap) |
524 | return NULL; | |
525 | ||
526 | mutex_lock(&dmabuf->lock); | |
527 | if (dmabuf->vmapping_counter) { | |
528 | dmabuf->vmapping_counter++; | |
529 | BUG_ON(!dmabuf->vmap_ptr); | |
530 | ptr = dmabuf->vmap_ptr; | |
531 | goto out_unlock; | |
532 | } | |
533 | ||
534 | BUG_ON(dmabuf->vmap_ptr); | |
535 | ||
536 | ptr = dmabuf->ops->vmap(dmabuf); | |
537 | if (IS_ERR_OR_NULL(ptr)) | |
538 | goto out_unlock; | |
539 | ||
540 | dmabuf->vmap_ptr = ptr; | |
541 | dmabuf->vmapping_counter = 1; | |
542 | ||
543 | out_unlock: | |
544 | mutex_unlock(&dmabuf->lock); | |
545 | return ptr; | |
98f86c9e DA |
546 | } |
547 | EXPORT_SYMBOL_GPL(dma_buf_vmap); | |
548 | ||
549 | /** | |
550 | * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. | |
12c4727e | 551 | * @dmabuf: [in] buffer to vunmap |
6e7b4a59 | 552 | * @vaddr: [in] vmap to vunmap |
98f86c9e DA |
553 | */ |
554 | void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) | |
555 | { | |
556 | if (WARN_ON(!dmabuf)) | |
557 | return; | |
558 | ||
f00b4dad DV |
559 | BUG_ON(!dmabuf->vmap_ptr); |
560 | BUG_ON(dmabuf->vmapping_counter == 0); | |
561 | BUG_ON(dmabuf->vmap_ptr != vaddr); | |
562 | ||
563 | mutex_lock(&dmabuf->lock); | |
564 | if (--dmabuf->vmapping_counter == 0) { | |
565 | if (dmabuf->ops->vunmap) | |
566 | dmabuf->ops->vunmap(dmabuf, vaddr); | |
567 | dmabuf->vmap_ptr = NULL; | |
568 | } | |
569 | mutex_unlock(&dmabuf->lock); | |
98f86c9e DA |
570 | } |
571 | EXPORT_SYMBOL_GPL(dma_buf_vunmap); | |
b89e3563 SS |
572 | |
573 | #ifdef CONFIG_DEBUG_FS | |
574 | static int dma_buf_describe(struct seq_file *s) | |
575 | { | |
576 | int ret; | |
577 | struct dma_buf *buf_obj; | |
578 | struct dma_buf_attachment *attach_obj; | |
579 | int count = 0, attach_count; | |
580 | size_t size = 0; | |
581 | ||
582 | ret = mutex_lock_interruptible(&db_list.lock); | |
583 | ||
584 | if (ret) | |
585 | return ret; | |
586 | ||
587 | seq_printf(s, "\nDma-buf Objects:\n"); | |
588 | seq_printf(s, "\texp_name\tsize\tflags\tmode\tcount\n"); | |
589 | ||
590 | list_for_each_entry(buf_obj, &db_list.head, list_node) { | |
591 | ret = mutex_lock_interruptible(&buf_obj->lock); | |
592 | ||
593 | if (ret) { | |
594 | seq_printf(s, | |
595 | "\tERROR locking buffer object: skipping\n"); | |
596 | continue; | |
597 | } | |
598 | ||
599 | seq_printf(s, "\t"); | |
600 | ||
601 | seq_printf(s, "\t%s\t%08zu\t%08x\t%08x\t%08ld\n", | |
602 | buf_obj->exp_name, buf_obj->size, | |
603 | buf_obj->file->f_flags, buf_obj->file->f_mode, | |
604 | (long)(buf_obj->file->f_count.counter)); | |
605 | ||
606 | seq_printf(s, "\t\tAttached Devices:\n"); | |
607 | attach_count = 0; | |
608 | ||
609 | list_for_each_entry(attach_obj, &buf_obj->attachments, node) { | |
610 | seq_printf(s, "\t\t"); | |
611 | ||
612 | seq_printf(s, "%s\n", attach_obj->dev->init_name); | |
613 | attach_count++; | |
614 | } | |
615 | ||
616 | seq_printf(s, "\n\t\tTotal %d devices attached\n", | |
617 | attach_count); | |
618 | ||
619 | count++; | |
620 | size += buf_obj->size; | |
621 | mutex_unlock(&buf_obj->lock); | |
622 | } | |
623 | ||
624 | seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size); | |
625 | ||
626 | mutex_unlock(&db_list.lock); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int dma_buf_show(struct seq_file *s, void *unused) | |
631 | { | |
632 | void (*func)(struct seq_file *) = s->private; | |
633 | func(s); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static int dma_buf_debug_open(struct inode *inode, struct file *file) | |
638 | { | |
639 | return single_open(file, dma_buf_show, inode->i_private); | |
640 | } | |
641 | ||
642 | static const struct file_operations dma_buf_debug_fops = { | |
643 | .open = dma_buf_debug_open, | |
644 | .read = seq_read, | |
645 | .llseek = seq_lseek, | |
646 | .release = single_release, | |
647 | }; | |
648 | ||
649 | static struct dentry *dma_buf_debugfs_dir; | |
650 | ||
651 | static int dma_buf_init_debugfs(void) | |
652 | { | |
653 | int err = 0; | |
654 | dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); | |
655 | if (IS_ERR(dma_buf_debugfs_dir)) { | |
656 | err = PTR_ERR(dma_buf_debugfs_dir); | |
657 | dma_buf_debugfs_dir = NULL; | |
658 | return err; | |
659 | } | |
660 | ||
661 | err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe); | |
662 | ||
663 | if (err) | |
664 | pr_debug("dma_buf: debugfs: failed to create node bufinfo\n"); | |
665 | ||
666 | return err; | |
667 | } | |
668 | ||
669 | static void dma_buf_uninit_debugfs(void) | |
670 | { | |
671 | if (dma_buf_debugfs_dir) | |
672 | debugfs_remove_recursive(dma_buf_debugfs_dir); | |
673 | } | |
674 | ||
675 | int dma_buf_debugfs_create_file(const char *name, | |
676 | int (*write)(struct seq_file *)) | |
677 | { | |
678 | struct dentry *d; | |
679 | ||
680 | d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir, | |
681 | write, &dma_buf_debug_fops); | |
682 | ||
703e6065 | 683 | return PTR_RET(d); |
b89e3563 SS |
684 | } |
685 | #else | |
686 | static inline int dma_buf_init_debugfs(void) | |
687 | { | |
688 | return 0; | |
689 | } | |
690 | static inline void dma_buf_uninit_debugfs(void) | |
691 | { | |
692 | } | |
693 | #endif | |
694 | ||
695 | static int __init dma_buf_init(void) | |
696 | { | |
697 | mutex_init(&db_list.lock); | |
698 | INIT_LIST_HEAD(&db_list.head); | |
699 | dma_buf_init_debugfs(); | |
700 | return 0; | |
701 | } | |
702 | subsys_initcall(dma_buf_init); | |
703 | ||
704 | static void __exit dma_buf_deinit(void) | |
705 | { | |
706 | dma_buf_uninit_debugfs(); | |
707 | } | |
708 | __exitcall(dma_buf_deinit); |