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2194a63a NT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright 2018 Noralf Trønnes | |
4 | */ | |
5 | ||
6 | #include <linux/dma-buf.h> | |
7 | #include <linux/export.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/shmem_fs.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/vmalloc.h> | |
12 | ||
d3ea256a | 13 | #include <drm/drm.h> |
2194a63a NT |
14 | #include <drm/drm_device.h> |
15 | #include <drm/drm_drv.h> | |
16 | #include <drm/drm_gem_shmem_helper.h> | |
17 | #include <drm/drm_prime.h> | |
18 | #include <drm/drm_print.h> | |
19 | ||
20 | /** | |
21 | * DOC: overview | |
22 | * | |
23 | * This library provides helpers for GEM objects backed by shmem buffers | |
24 | * allocated using anonymous pageable memory. | |
25 | */ | |
26 | ||
27 | static const struct drm_gem_object_funcs drm_gem_shmem_funcs = { | |
28 | .free = drm_gem_shmem_free_object, | |
29 | .print_info = drm_gem_shmem_print_info, | |
30 | .pin = drm_gem_shmem_pin, | |
31 | .unpin = drm_gem_shmem_unpin, | |
32 | .get_sg_table = drm_gem_shmem_get_sg_table, | |
33 | .vmap = drm_gem_shmem_vmap, | |
34 | .vunmap = drm_gem_shmem_vunmap, | |
0be89589 | 35 | .mmap = drm_gem_shmem_mmap, |
2194a63a NT |
36 | }; |
37 | ||
7d2cd72a DV |
38 | static struct drm_gem_shmem_object * |
39 | __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private) | |
2194a63a NT |
40 | { |
41 | struct drm_gem_shmem_object *shmem; | |
42 | struct drm_gem_object *obj; | |
7d2cd72a | 43 | int ret = 0; |
2194a63a NT |
44 | |
45 | size = PAGE_ALIGN(size); | |
46 | ||
47 | if (dev->driver->gem_create_object) | |
48 | obj = dev->driver->gem_create_object(dev, size); | |
49 | else | |
50 | obj = kzalloc(sizeof(*shmem), GFP_KERNEL); | |
51 | if (!obj) | |
52 | return ERR_PTR(-ENOMEM); | |
53 | ||
54 | if (!obj->funcs) | |
55 | obj->funcs = &drm_gem_shmem_funcs; | |
56 | ||
7d2cd72a DV |
57 | if (private) |
58 | drm_gem_private_object_init(dev, obj, size); | |
59 | else | |
60 | ret = drm_gem_object_init(dev, obj, size); | |
2194a63a NT |
61 | if (ret) |
62 | goto err_free; | |
63 | ||
64 | ret = drm_gem_create_mmap_offset(obj); | |
65 | if (ret) | |
66 | goto err_release; | |
67 | ||
68 | shmem = to_drm_gem_shmem_obj(obj); | |
69 | mutex_init(&shmem->pages_lock); | |
70 | mutex_init(&shmem->vmap_lock); | |
17acb9f3 | 71 | INIT_LIST_HEAD(&shmem->madv_list); |
2194a63a | 72 | |
5b9f5f11 DV |
73 | if (!private) { |
74 | /* | |
75 | * Our buffers are kept pinned, so allocating them | |
76 | * from the MOVABLE zone is a really bad idea, and | |
77 | * conflicts with CMA. See comments above new_inode() | |
78 | * why this is required _and_ expected if you're | |
79 | * going to pin these pages. | |
80 | */ | |
81 | mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER | | |
82 | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); | |
83 | } | |
2194a63a NT |
84 | |
85 | return shmem; | |
86 | ||
87 | err_release: | |
88 | drm_gem_object_release(obj); | |
89 | err_free: | |
90 | kfree(obj); | |
91 | ||
92 | return ERR_PTR(ret); | |
93 | } | |
7d2cd72a DV |
94 | /** |
95 | * drm_gem_shmem_create - Allocate an object with the given size | |
96 | * @dev: DRM device | |
97 | * @size: Size of the object to allocate | |
98 | * | |
99 | * This function creates a shmem GEM object. | |
100 | * | |
101 | * Returns: | |
102 | * A struct drm_gem_shmem_object * on success or an ERR_PTR()-encoded negative | |
103 | * error code on failure. | |
104 | */ | |
105 | struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size) | |
106 | { | |
107 | return __drm_gem_shmem_create(dev, size, false); | |
108 | } | |
2194a63a NT |
109 | EXPORT_SYMBOL_GPL(drm_gem_shmem_create); |
110 | ||
111 | /** | |
112 | * drm_gem_shmem_free_object - Free resources associated with a shmem GEM object | |
113 | * @obj: GEM object to free | |
114 | * | |
115 | * This function cleans up the GEM object state and frees the memory used to | |
0b638559 DV |
116 | * store the object itself. It should be used to implement |
117 | * &drm_gem_object_funcs.free. | |
2194a63a NT |
118 | */ |
119 | void drm_gem_shmem_free_object(struct drm_gem_object *obj) | |
120 | { | |
121 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
122 | ||
123 | WARN_ON(shmem->vmap_use_count); | |
124 | ||
125 | if (obj->import_attach) { | |
2194a63a | 126 | drm_prime_gem_destroy(obj, shmem->sgt); |
2194a63a NT |
127 | } else { |
128 | if (shmem->sgt) { | |
129 | dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, | |
130 | shmem->sgt->nents, DMA_BIDIRECTIONAL); | |
2194a63a NT |
131 | sg_free_table(shmem->sgt); |
132 | kfree(shmem->sgt); | |
133 | } | |
3bf5189d RH |
134 | if (shmem->pages) |
135 | drm_gem_shmem_put_pages(shmem); | |
2194a63a NT |
136 | } |
137 | ||
138 | WARN_ON(shmem->pages_use_count); | |
139 | ||
140 | drm_gem_object_release(obj); | |
141 | mutex_destroy(&shmem->pages_lock); | |
142 | mutex_destroy(&shmem->vmap_lock); | |
143 | kfree(shmem); | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(drm_gem_shmem_free_object); | |
146 | ||
147 | static int drm_gem_shmem_get_pages_locked(struct drm_gem_shmem_object *shmem) | |
148 | { | |
149 | struct drm_gem_object *obj = &shmem->base; | |
150 | struct page **pages; | |
151 | ||
152 | if (shmem->pages_use_count++ > 0) | |
153 | return 0; | |
154 | ||
155 | pages = drm_gem_get_pages(obj); | |
156 | if (IS_ERR(pages)) { | |
157 | DRM_DEBUG_KMS("Failed to get pages (%ld)\n", PTR_ERR(pages)); | |
158 | shmem->pages_use_count = 0; | |
159 | return PTR_ERR(pages); | |
160 | } | |
161 | ||
162 | shmem->pages = pages; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | /* | |
168 | * drm_gem_shmem_get_pages - Allocate backing pages for a shmem GEM object | |
169 | * @shmem: shmem GEM object | |
170 | * | |
171 | * This function makes sure that backing pages exists for the shmem GEM object | |
172 | * and increases the use count. | |
173 | * | |
174 | * Returns: | |
175 | * 0 on success or a negative error code on failure. | |
176 | */ | |
177 | int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem) | |
178 | { | |
179 | int ret; | |
180 | ||
52640835 DV |
181 | WARN_ON(shmem->base.import_attach); |
182 | ||
2194a63a NT |
183 | ret = mutex_lock_interruptible(&shmem->pages_lock); |
184 | if (ret) | |
185 | return ret; | |
186 | ret = drm_gem_shmem_get_pages_locked(shmem); | |
187 | mutex_unlock(&shmem->pages_lock); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | EXPORT_SYMBOL(drm_gem_shmem_get_pages); | |
192 | ||
193 | static void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem) | |
194 | { | |
195 | struct drm_gem_object *obj = &shmem->base; | |
196 | ||
197 | if (WARN_ON_ONCE(!shmem->pages_use_count)) | |
198 | return; | |
199 | ||
200 | if (--shmem->pages_use_count > 0) | |
201 | return; | |
202 | ||
203 | drm_gem_put_pages(obj, shmem->pages, | |
204 | shmem->pages_mark_dirty_on_put, | |
205 | shmem->pages_mark_accessed_on_put); | |
206 | shmem->pages = NULL; | |
207 | } | |
208 | ||
209 | /* | |
210 | * drm_gem_shmem_put_pages - Decrease use count on the backing pages for a shmem GEM object | |
211 | * @shmem: shmem GEM object | |
212 | * | |
213 | * This function decreases the use count and puts the backing pages when use drops to zero. | |
214 | */ | |
215 | void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem) | |
216 | { | |
217 | mutex_lock(&shmem->pages_lock); | |
218 | drm_gem_shmem_put_pages_locked(shmem); | |
219 | mutex_unlock(&shmem->pages_lock); | |
220 | } | |
221 | EXPORT_SYMBOL(drm_gem_shmem_put_pages); | |
222 | ||
223 | /** | |
224 | * drm_gem_shmem_pin - Pin backing pages for a shmem GEM object | |
225 | * @obj: GEM object | |
226 | * | |
227 | * This function makes sure the backing pages are pinned in memory while the | |
0b638559 DV |
228 | * buffer is exported. It should only be used to implement |
229 | * &drm_gem_object_funcs.pin. | |
2194a63a NT |
230 | * |
231 | * Returns: | |
232 | * 0 on success or a negative error code on failure. | |
233 | */ | |
234 | int drm_gem_shmem_pin(struct drm_gem_object *obj) | |
235 | { | |
236 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
237 | ||
52640835 DV |
238 | WARN_ON(shmem->base.import_attach); |
239 | ||
2194a63a NT |
240 | return drm_gem_shmem_get_pages(shmem); |
241 | } | |
242 | EXPORT_SYMBOL(drm_gem_shmem_pin); | |
243 | ||
244 | /** | |
245 | * drm_gem_shmem_unpin - Unpin backing pages for a shmem GEM object | |
246 | * @obj: GEM object | |
247 | * | |
248 | * This function removes the requirement that the backing pages are pinned in | |
0b638559 | 249 | * memory. It should only be used to implement &drm_gem_object_funcs.unpin. |
2194a63a NT |
250 | */ |
251 | void drm_gem_shmem_unpin(struct drm_gem_object *obj) | |
252 | { | |
253 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
254 | ||
52640835 DV |
255 | WARN_ON(shmem->base.import_attach); |
256 | ||
2194a63a NT |
257 | drm_gem_shmem_put_pages(shmem); |
258 | } | |
259 | EXPORT_SYMBOL(drm_gem_shmem_unpin); | |
260 | ||
261 | static void *drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem) | |
262 | { | |
263 | struct drm_gem_object *obj = &shmem->base; | |
264 | int ret; | |
265 | ||
266 | if (shmem->vmap_use_count++ > 0) | |
267 | return shmem->vaddr; | |
268 | ||
1cad6292 | 269 | if (obj->import_attach) { |
2194a63a | 270 | shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf); |
1cad6292 GH |
271 | } else { |
272 | pgprot_t prot = PAGE_KERNEL; | |
273 | ||
0cc5fb4e DV |
274 | ret = drm_gem_shmem_get_pages(shmem); |
275 | if (ret) | |
276 | goto err_zero_use; | |
277 | ||
1cad6292 GH |
278 | if (!shmem->map_cached) |
279 | prot = pgprot_writecombine(prot); | |
be7d9f05 | 280 | shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT, |
1cad6292 GH |
281 | VM_MAP, prot); |
282 | } | |
2194a63a NT |
283 | |
284 | if (!shmem->vaddr) { | |
285 | DRM_DEBUG_KMS("Failed to vmap pages\n"); | |
286 | ret = -ENOMEM; | |
287 | goto err_put_pages; | |
288 | } | |
289 | ||
290 | return shmem->vaddr; | |
291 | ||
292 | err_put_pages: | |
0cc5fb4e DV |
293 | if (!obj->import_attach) |
294 | drm_gem_shmem_put_pages(shmem); | |
2194a63a NT |
295 | err_zero_use: |
296 | shmem->vmap_use_count = 0; | |
297 | ||
298 | return ERR_PTR(ret); | |
299 | } | |
300 | ||
301 | /* | |
302 | * drm_gem_shmem_vmap - Create a virtual mapping for a shmem GEM object | |
303 | * @shmem: shmem GEM object | |
304 | * | |
0b638559 DV |
305 | * This function makes sure that a contiguous kernel virtual address mapping |
306 | * exists for the buffer backing the shmem GEM object. | |
307 | * | |
308 | * This function can be used to implement &drm_gem_object_funcs.vmap. But it can | |
309 | * also be called by drivers directly, in which case it will hide the | |
310 | * differences between dma-buf imported and natively allocated objects. | |
311 | * | |
312 | * Acquired mappings should be cleaned up by calling drm_gem_shmem_vunmap(). | |
2194a63a NT |
313 | * |
314 | * Returns: | |
315 | * 0 on success or a negative error code on failure. | |
316 | */ | |
317 | void *drm_gem_shmem_vmap(struct drm_gem_object *obj) | |
318 | { | |
319 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
320 | void *vaddr; | |
321 | int ret; | |
322 | ||
323 | ret = mutex_lock_interruptible(&shmem->vmap_lock); | |
324 | if (ret) | |
325 | return ERR_PTR(ret); | |
326 | vaddr = drm_gem_shmem_vmap_locked(shmem); | |
327 | mutex_unlock(&shmem->vmap_lock); | |
328 | ||
329 | return vaddr; | |
330 | } | |
331 | EXPORT_SYMBOL(drm_gem_shmem_vmap); | |
332 | ||
333 | static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem) | |
334 | { | |
335 | struct drm_gem_object *obj = &shmem->base; | |
336 | ||
337 | if (WARN_ON_ONCE(!shmem->vmap_use_count)) | |
338 | return; | |
339 | ||
340 | if (--shmem->vmap_use_count > 0) | |
341 | return; | |
342 | ||
343 | if (obj->import_attach) | |
344 | dma_buf_vunmap(obj->import_attach->dmabuf, shmem->vaddr); | |
345 | else | |
346 | vunmap(shmem->vaddr); | |
347 | ||
348 | shmem->vaddr = NULL; | |
349 | drm_gem_shmem_put_pages(shmem); | |
350 | } | |
351 | ||
352 | /* | |
353 | * drm_gem_shmem_vunmap - Unmap a virtual mapping fo a shmem GEM object | |
354 | * @shmem: shmem GEM object | |
355 | * | |
0b638559 DV |
356 | * This function cleans up a kernel virtual address mapping acquired by |
357 | * drm_gem_shmem_vmap(). The mapping is only removed when the use count drops to | |
358 | * zero. | |
359 | * | |
360 | * This function can be used to implement &drm_gem_object_funcs.vmap. But it can | |
361 | * also be called by drivers directly, in which case it will hide the | |
362 | * differences between dma-buf imported and natively allocated objects. | |
2194a63a NT |
363 | */ |
364 | void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr) | |
365 | { | |
366 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
367 | ||
368 | mutex_lock(&shmem->vmap_lock); | |
369 | drm_gem_shmem_vunmap_locked(shmem); | |
370 | mutex_unlock(&shmem->vmap_lock); | |
371 | } | |
372 | EXPORT_SYMBOL(drm_gem_shmem_vunmap); | |
373 | ||
374 | struct drm_gem_shmem_object * | |
375 | drm_gem_shmem_create_with_handle(struct drm_file *file_priv, | |
376 | struct drm_device *dev, size_t size, | |
377 | uint32_t *handle) | |
378 | { | |
379 | struct drm_gem_shmem_object *shmem; | |
380 | int ret; | |
381 | ||
cfe28f90 | 382 | shmem = drm_gem_shmem_create(dev, size); |
2194a63a NT |
383 | if (IS_ERR(shmem)) |
384 | return shmem; | |
385 | ||
386 | /* | |
387 | * Allocate an id of idr table where the obj is registered | |
388 | * and handle has the id what user can see. | |
389 | */ | |
390 | ret = drm_gem_handle_create(file_priv, &shmem->base, handle); | |
391 | /* drop reference from allocate - handle holds it now. */ | |
be6ee102 | 392 | drm_gem_object_put(&shmem->base); |
2194a63a NT |
393 | if (ret) |
394 | return ERR_PTR(ret); | |
395 | ||
396 | return shmem; | |
397 | } | |
398 | EXPORT_SYMBOL(drm_gem_shmem_create_with_handle); | |
399 | ||
17acb9f3 RH |
400 | /* Update madvise status, returns true if not purged, else |
401 | * false or -errno. | |
402 | */ | |
403 | int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv) | |
404 | { | |
405 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
406 | ||
407 | mutex_lock(&shmem->pages_lock); | |
408 | ||
409 | if (shmem->madv >= 0) | |
410 | shmem->madv = madv; | |
411 | ||
412 | madv = shmem->madv; | |
413 | ||
414 | mutex_unlock(&shmem->pages_lock); | |
415 | ||
416 | return (madv >= 0); | |
417 | } | |
418 | EXPORT_SYMBOL(drm_gem_shmem_madvise); | |
419 | ||
420 | void drm_gem_shmem_purge_locked(struct drm_gem_object *obj) | |
421 | { | |
422 | struct drm_device *dev = obj->dev; | |
423 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
424 | ||
425 | WARN_ON(!drm_gem_shmem_is_purgeable(shmem)); | |
426 | ||
4fa3d66f RH |
427 | dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, |
428 | shmem->sgt->nents, DMA_BIDIRECTIONAL); | |
429 | sg_free_table(shmem->sgt); | |
430 | kfree(shmem->sgt); | |
431 | shmem->sgt = NULL; | |
432 | ||
17acb9f3 RH |
433 | drm_gem_shmem_put_pages_locked(shmem); |
434 | ||
435 | shmem->madv = -1; | |
436 | ||
437 | drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping); | |
438 | drm_gem_free_mmap_offset(obj); | |
439 | ||
440 | /* Our goal here is to return as much of the memory as | |
441 | * is possible back to the system as we are called from OOM. | |
442 | * To do this we must instruct the shmfs to drop all of its | |
443 | * backing pages, *now*. | |
444 | */ | |
445 | shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1); | |
446 | ||
447 | invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, | |
448 | 0, (loff_t)-1); | |
449 | } | |
450 | EXPORT_SYMBOL(drm_gem_shmem_purge_locked); | |
451 | ||
dfbc7a46 | 452 | bool drm_gem_shmem_purge(struct drm_gem_object *obj) |
17acb9f3 RH |
453 | { |
454 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
455 | ||
dfbc7a46 RH |
456 | if (!mutex_trylock(&shmem->pages_lock)) |
457 | return false; | |
17acb9f3 RH |
458 | drm_gem_shmem_purge_locked(obj); |
459 | mutex_unlock(&shmem->pages_lock); | |
dfbc7a46 RH |
460 | |
461 | return true; | |
17acb9f3 RH |
462 | } |
463 | EXPORT_SYMBOL(drm_gem_shmem_purge); | |
464 | ||
d18ee06b TZ |
465 | /** |
466 | * drm_gem_shmem_create_object_cached - Create a shmem buffer object with | |
467 | * cached mappings | |
468 | * @dev: DRM device | |
469 | * @size: Size of the object to allocate | |
470 | * | |
471 | * By default, shmem buffer objects use writecombine mappings. This | |
472 | * function implements struct drm_driver.gem_create_object for shmem | |
473 | * buffer objects with cached mappings. | |
474 | * | |
475 | * Returns: | |
476 | * A struct drm_gem_shmem_object * on success or NULL negative on failure. | |
477 | */ | |
478 | struct drm_gem_object * | |
479 | drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size) | |
480 | { | |
481 | struct drm_gem_shmem_object *shmem; | |
482 | ||
483 | shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); | |
484 | if (!shmem) | |
485 | return NULL; | |
486 | shmem->map_cached = true; | |
487 | ||
488 | return &shmem->base; | |
489 | } | |
490 | EXPORT_SYMBOL(drm_gem_shmem_create_object_cached); | |
491 | ||
2194a63a NT |
492 | /** |
493 | * drm_gem_shmem_dumb_create - Create a dumb shmem buffer object | |
494 | * @file: DRM file structure to create the dumb buffer for | |
495 | * @dev: DRM device | |
496 | * @args: IOCTL data | |
497 | * | |
498 | * This function computes the pitch of the dumb buffer and rounds it up to an | |
499 | * integer number of bytes per pixel. Drivers for hardware that doesn't have | |
500 | * any additional restrictions on the pitch can directly use this function as | |
501 | * their &drm_driver.dumb_create callback. | |
502 | * | |
503 | * For hardware with additional restrictions, drivers can adjust the fields | |
504 | * set up by userspace before calling into this function. | |
505 | * | |
506 | * Returns: | |
507 | * 0 on success or a negative error code on failure. | |
508 | */ | |
509 | int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
510 | struct drm_mode_create_dumb *args) | |
511 | { | |
512 | u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
513 | struct drm_gem_shmem_object *shmem; | |
514 | ||
515 | if (!args->pitch || !args->size) { | |
516 | args->pitch = min_pitch; | |
517 | args->size = args->pitch * args->height; | |
518 | } else { | |
519 | /* ensure sane minimum values */ | |
520 | if (args->pitch < min_pitch) | |
521 | args->pitch = min_pitch; | |
522 | if (args->size < args->pitch * args->height) | |
523 | args->size = args->pitch * args->height; | |
524 | } | |
525 | ||
526 | shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle); | |
527 | ||
528 | return PTR_ERR_OR_ZERO(shmem); | |
529 | } | |
530 | EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create); | |
531 | ||
532 | static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf) | |
533 | { | |
534 | struct vm_area_struct *vma = vmf->vma; | |
535 | struct drm_gem_object *obj = vma->vm_private_data; | |
536 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
537 | loff_t num_pages = obj->size >> PAGE_SHIFT; | |
538 | struct page *page; | |
539 | ||
3a3fe6e7 | 540 | if (vmf->pgoff >= num_pages || WARN_ON_ONCE(!shmem->pages)) |
2194a63a NT |
541 | return VM_FAULT_SIGBUS; |
542 | ||
543 | page = shmem->pages[vmf->pgoff]; | |
544 | ||
545 | return vmf_insert_page(vma, vmf->address, page); | |
546 | } | |
547 | ||
548 | static void drm_gem_shmem_vm_open(struct vm_area_struct *vma) | |
549 | { | |
550 | struct drm_gem_object *obj = vma->vm_private_data; | |
551 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
552 | int ret; | |
553 | ||
52640835 DV |
554 | WARN_ON(shmem->base.import_attach); |
555 | ||
2194a63a NT |
556 | ret = drm_gem_shmem_get_pages(shmem); |
557 | WARN_ON_ONCE(ret != 0); | |
558 | ||
559 | drm_gem_vm_open(vma); | |
560 | } | |
561 | ||
562 | static void drm_gem_shmem_vm_close(struct vm_area_struct *vma) | |
563 | { | |
564 | struct drm_gem_object *obj = vma->vm_private_data; | |
565 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
566 | ||
567 | drm_gem_shmem_put_pages(shmem); | |
568 | drm_gem_vm_close(vma); | |
569 | } | |
570 | ||
0be89589 | 571 | static const struct vm_operations_struct drm_gem_shmem_vm_ops = { |
2194a63a NT |
572 | .fault = drm_gem_shmem_fault, |
573 | .open = drm_gem_shmem_vm_open, | |
574 | .close = drm_gem_shmem_vm_close, | |
575 | }; | |
2194a63a NT |
576 | |
577 | /** | |
578 | * drm_gem_shmem_mmap - Memory-map a shmem GEM object | |
0be89589 | 579 | * @obj: gem object |
2194a63a NT |
580 | * @vma: VMA for the area to be mapped |
581 | * | |
582 | * This function implements an augmented version of the GEM DRM file mmap | |
583 | * operation for shmem objects. Drivers which employ the shmem helpers should | |
0be89589 | 584 | * use this function as their &drm_gem_object_funcs.mmap handler. |
2194a63a NT |
585 | * |
586 | * Returns: | |
587 | * 0 on success or a negative error code on failure. | |
588 | */ | |
0be89589 | 589 | int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) |
2194a63a NT |
590 | { |
591 | struct drm_gem_shmem_object *shmem; | |
592 | int ret; | |
593 | ||
e5516553 GH |
594 | /* Remove the fake offset */ |
595 | vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node); | |
596 | ||
26d3ac3c DV |
597 | if (obj->import_attach) |
598 | return dma_buf_mmap(obj->dma_buf, vma, 0); | |
599 | ||
0be89589 | 600 | shmem = to_drm_gem_shmem_obj(obj); |
2194a63a NT |
601 | |
602 | ret = drm_gem_shmem_get_pages(shmem); | |
603 | if (ret) { | |
604 | drm_gem_vm_close(vma); | |
605 | return ret; | |
606 | } | |
607 | ||
1bf01e1e | 608 | vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; |
1cad6292 GH |
609 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
610 | if (!shmem->map_cached) | |
611 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | |
0be89589 | 612 | vma->vm_ops = &drm_gem_shmem_vm_ops; |
2194a63a | 613 | |
2194a63a NT |
614 | return 0; |
615 | } | |
616 | EXPORT_SYMBOL_GPL(drm_gem_shmem_mmap); | |
617 | ||
618 | /** | |
619 | * drm_gem_shmem_print_info() - Print &drm_gem_shmem_object info for debugfs | |
620 | * @p: DRM printer | |
621 | * @indent: Tab indentation level | |
622 | * @obj: GEM object | |
0b638559 DV |
623 | * |
624 | * This implements the &drm_gem_object_funcs.info callback. | |
2194a63a NT |
625 | */ |
626 | void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent, | |
627 | const struct drm_gem_object *obj) | |
628 | { | |
629 | const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
630 | ||
631 | drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count); | |
632 | drm_printf_indent(p, indent, "vmap_use_count=%u\n", shmem->vmap_use_count); | |
633 | drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr); | |
634 | } | |
635 | EXPORT_SYMBOL(drm_gem_shmem_print_info); | |
636 | ||
637 | /** | |
638 | * drm_gem_shmem_get_sg_table - Provide a scatter/gather table of pinned | |
639 | * pages for a shmem GEM object | |
640 | * @obj: GEM object | |
641 | * | |
642 | * This function exports a scatter/gather table suitable for PRIME usage by | |
0b638559 DV |
643 | * calling the standard DMA mapping API. Drivers should not call this function |
644 | * directly, instead it should only be used as an implementation for | |
645 | * &drm_gem_object_funcs.get_sg_table. | |
646 | * | |
647 | * Drivers who need to acquire an scatter/gather table for objects need to call | |
648 | * drm_gem_shmem_get_pages_sgt() instead. | |
2194a63a NT |
649 | * |
650 | * Returns: | |
651 | * A pointer to the scatter/gather table of pinned pages or NULL on failure. | |
652 | */ | |
653 | struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj) | |
654 | { | |
655 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
656 | ||
52640835 DV |
657 | WARN_ON(shmem->base.import_attach); |
658 | ||
2194a63a NT |
659 | return drm_prime_pages_to_sg(shmem->pages, obj->size >> PAGE_SHIFT); |
660 | } | |
661 | EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table); | |
662 | ||
663 | /** | |
664 | * drm_gem_shmem_get_pages_sgt - Pin pages, dma map them, and return a | |
665 | * scatter/gather table for a shmem GEM object. | |
666 | * @obj: GEM object | |
667 | * | |
668 | * This function returns a scatter/gather table suitable for driver usage. If | |
669 | * the sg table doesn't exist, the pages are pinned, dma-mapped, and a sg | |
670 | * table created. | |
671 | * | |
0b638559 DV |
672 | * This is the main function for drivers to get at backing storage, and it hides |
673 | * and difference between dma-buf imported and natively allocated objects. | |
674 | * drm_gem_shmem_get_sg_table() should not be directly called by drivers. | |
675 | * | |
2194a63a NT |
676 | * Returns: |
677 | * A pointer to the scatter/gather table of pinned pages or errno on failure. | |
678 | */ | |
679 | struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj) | |
680 | { | |
681 | int ret; | |
682 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
683 | struct sg_table *sgt; | |
684 | ||
685 | if (shmem->sgt) | |
686 | return shmem->sgt; | |
687 | ||
688 | WARN_ON(obj->import_attach); | |
689 | ||
690 | ret = drm_gem_shmem_get_pages(shmem); | |
691 | if (ret) | |
692 | return ERR_PTR(ret); | |
693 | ||
694 | sgt = drm_gem_shmem_get_sg_table(&shmem->base); | |
695 | if (IS_ERR(sgt)) { | |
696 | ret = PTR_ERR(sgt); | |
697 | goto err_put_pages; | |
698 | } | |
699 | /* Map the pages for use by the h/w. */ | |
700 | dma_map_sg(obj->dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL); | |
701 | ||
702 | shmem->sgt = sgt; | |
703 | ||
704 | return sgt; | |
705 | ||
706 | err_put_pages: | |
707 | drm_gem_shmem_put_pages(shmem); | |
708 | return ERR_PTR(ret); | |
709 | } | |
710 | EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages_sgt); | |
711 | ||
712 | /** | |
713 | * drm_gem_shmem_prime_import_sg_table - Produce a shmem GEM object from | |
714 | * another driver's scatter/gather table of pinned pages | |
715 | * @dev: Device to import into | |
716 | * @attach: DMA-BUF attachment | |
717 | * @sgt: Scatter/gather table of pinned pages | |
718 | * | |
719 | * This function imports a scatter/gather table exported via DMA-BUF by | |
720 | * another driver. Drivers that use the shmem helpers should set this as their | |
721 | * &drm_driver.gem_prime_import_sg_table callback. | |
722 | * | |
723 | * Returns: | |
724 | * A pointer to a newly created GEM object or an ERR_PTR-encoded negative | |
725 | * error code on failure. | |
726 | */ | |
727 | struct drm_gem_object * | |
728 | drm_gem_shmem_prime_import_sg_table(struct drm_device *dev, | |
729 | struct dma_buf_attachment *attach, | |
730 | struct sg_table *sgt) | |
731 | { | |
732 | size_t size = PAGE_ALIGN(attach->dmabuf->size); | |
2194a63a | 733 | struct drm_gem_shmem_object *shmem; |
2194a63a | 734 | |
cfe28f90 | 735 | shmem = __drm_gem_shmem_create(dev, size, true); |
2194a63a NT |
736 | if (IS_ERR(shmem)) |
737 | return ERR_CAST(shmem); | |
738 | ||
2194a63a | 739 | shmem->sgt = sgt; |
2194a63a NT |
740 | |
741 | DRM_DEBUG_PRIME("size = %zu\n", size); | |
742 | ||
743 | return &shmem->base; | |
2194a63a NT |
744 | } |
745 | EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table); |