Commit | Line | Data |
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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 | ||
0cf2ef46 TZ |
54 | shmem = to_drm_gem_shmem_obj(obj); |
55 | ||
2194a63a NT |
56 | if (!obj->funcs) |
57 | obj->funcs = &drm_gem_shmem_funcs; | |
58 | ||
0cf2ef46 | 59 | if (private) { |
7d2cd72a | 60 | drm_gem_private_object_init(dev, obj, size); |
0cf2ef46 TZ |
61 | shmem->map_wc = false; /* dma-buf mappings use always writecombine */ |
62 | } else { | |
7d2cd72a | 63 | ret = drm_gem_object_init(dev, obj, size); |
0cf2ef46 | 64 | } |
2194a63a NT |
65 | if (ret) |
66 | goto err_free; | |
67 | ||
68 | ret = drm_gem_create_mmap_offset(obj); | |
69 | if (ret) | |
70 | goto err_release; | |
71 | ||
2194a63a NT |
72 | mutex_init(&shmem->pages_lock); |
73 | mutex_init(&shmem->vmap_lock); | |
17acb9f3 | 74 | INIT_LIST_HEAD(&shmem->madv_list); |
2194a63a | 75 | |
5b9f5f11 DV |
76 | if (!private) { |
77 | /* | |
78 | * Our buffers are kept pinned, so allocating them | |
79 | * from the MOVABLE zone is a really bad idea, and | |
80 | * conflicts with CMA. See comments above new_inode() | |
81 | * why this is required _and_ expected if you're | |
82 | * going to pin these pages. | |
83 | */ | |
84 | mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER | | |
85 | __GFP_RETRY_MAYFAIL | __GFP_NOWARN); | |
86 | } | |
2194a63a NT |
87 | |
88 | return shmem; | |
89 | ||
90 | err_release: | |
91 | drm_gem_object_release(obj); | |
92 | err_free: | |
93 | kfree(obj); | |
94 | ||
95 | return ERR_PTR(ret); | |
96 | } | |
7d2cd72a DV |
97 | /** |
98 | * drm_gem_shmem_create - Allocate an object with the given size | |
99 | * @dev: DRM device | |
100 | * @size: Size of the object to allocate | |
101 | * | |
102 | * This function creates a shmem GEM object. | |
103 | * | |
104 | * Returns: | |
105 | * A struct drm_gem_shmem_object * on success or an ERR_PTR()-encoded negative | |
106 | * error code on failure. | |
107 | */ | |
108 | struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size) | |
109 | { | |
110 | return __drm_gem_shmem_create(dev, size, false); | |
111 | } | |
2194a63a NT |
112 | EXPORT_SYMBOL_GPL(drm_gem_shmem_create); |
113 | ||
114 | /** | |
115 | * drm_gem_shmem_free_object - Free resources associated with a shmem GEM object | |
116 | * @obj: GEM object to free | |
117 | * | |
118 | * This function cleans up the GEM object state and frees the memory used to | |
0b638559 DV |
119 | * store the object itself. It should be used to implement |
120 | * &drm_gem_object_funcs.free. | |
2194a63a NT |
121 | */ |
122 | void drm_gem_shmem_free_object(struct drm_gem_object *obj) | |
123 | { | |
124 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
125 | ||
126 | WARN_ON(shmem->vmap_use_count); | |
127 | ||
128 | if (obj->import_attach) { | |
2194a63a | 129 | drm_prime_gem_destroy(obj, shmem->sgt); |
2194a63a NT |
130 | } else { |
131 | if (shmem->sgt) { | |
6c6fa39c MS |
132 | dma_unmap_sgtable(obj->dev->dev, shmem->sgt, |
133 | DMA_BIDIRECTIONAL, 0); | |
2194a63a NT |
134 | sg_free_table(shmem->sgt); |
135 | kfree(shmem->sgt); | |
136 | } | |
3bf5189d RH |
137 | if (shmem->pages) |
138 | drm_gem_shmem_put_pages(shmem); | |
2194a63a NT |
139 | } |
140 | ||
141 | WARN_ON(shmem->pages_use_count); | |
142 | ||
143 | drm_gem_object_release(obj); | |
144 | mutex_destroy(&shmem->pages_lock); | |
145 | mutex_destroy(&shmem->vmap_lock); | |
146 | kfree(shmem); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(drm_gem_shmem_free_object); | |
149 | ||
150 | static int drm_gem_shmem_get_pages_locked(struct drm_gem_shmem_object *shmem) | |
151 | { | |
152 | struct drm_gem_object *obj = &shmem->base; | |
153 | struct page **pages; | |
154 | ||
155 | if (shmem->pages_use_count++ > 0) | |
156 | return 0; | |
157 | ||
158 | pages = drm_gem_get_pages(obj); | |
159 | if (IS_ERR(pages)) { | |
160 | DRM_DEBUG_KMS("Failed to get pages (%ld)\n", PTR_ERR(pages)); | |
161 | shmem->pages_use_count = 0; | |
162 | return PTR_ERR(pages); | |
163 | } | |
164 | ||
165 | shmem->pages = pages; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | /* | |
171 | * drm_gem_shmem_get_pages - Allocate backing pages for a shmem GEM object | |
172 | * @shmem: shmem GEM object | |
173 | * | |
174 | * This function makes sure that backing pages exists for the shmem GEM object | |
175 | * and increases the use count. | |
176 | * | |
177 | * Returns: | |
178 | * 0 on success or a negative error code on failure. | |
179 | */ | |
180 | int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem) | |
181 | { | |
182 | int ret; | |
183 | ||
52640835 DV |
184 | WARN_ON(shmem->base.import_attach); |
185 | ||
2194a63a NT |
186 | ret = mutex_lock_interruptible(&shmem->pages_lock); |
187 | if (ret) | |
188 | return ret; | |
189 | ret = drm_gem_shmem_get_pages_locked(shmem); | |
190 | mutex_unlock(&shmem->pages_lock); | |
191 | ||
192 | return ret; | |
193 | } | |
194 | EXPORT_SYMBOL(drm_gem_shmem_get_pages); | |
195 | ||
196 | static void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem) | |
197 | { | |
198 | struct drm_gem_object *obj = &shmem->base; | |
199 | ||
200 | if (WARN_ON_ONCE(!shmem->pages_use_count)) | |
201 | return; | |
202 | ||
203 | if (--shmem->pages_use_count > 0) | |
204 | return; | |
205 | ||
206 | drm_gem_put_pages(obj, shmem->pages, | |
207 | shmem->pages_mark_dirty_on_put, | |
208 | shmem->pages_mark_accessed_on_put); | |
209 | shmem->pages = NULL; | |
210 | } | |
211 | ||
212 | /* | |
213 | * drm_gem_shmem_put_pages - Decrease use count on the backing pages for a shmem GEM object | |
214 | * @shmem: shmem GEM object | |
215 | * | |
216 | * This function decreases the use count and puts the backing pages when use drops to zero. | |
217 | */ | |
218 | void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem) | |
219 | { | |
220 | mutex_lock(&shmem->pages_lock); | |
221 | drm_gem_shmem_put_pages_locked(shmem); | |
222 | mutex_unlock(&shmem->pages_lock); | |
223 | } | |
224 | EXPORT_SYMBOL(drm_gem_shmem_put_pages); | |
225 | ||
226 | /** | |
227 | * drm_gem_shmem_pin - Pin backing pages for a shmem GEM object | |
228 | * @obj: GEM object | |
229 | * | |
230 | * This function makes sure the backing pages are pinned in memory while the | |
0b638559 DV |
231 | * buffer is exported. It should only be used to implement |
232 | * &drm_gem_object_funcs.pin. | |
2194a63a NT |
233 | * |
234 | * Returns: | |
235 | * 0 on success or a negative error code on failure. | |
236 | */ | |
237 | int drm_gem_shmem_pin(struct drm_gem_object *obj) | |
238 | { | |
239 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
240 | ||
52640835 DV |
241 | WARN_ON(shmem->base.import_attach); |
242 | ||
2194a63a NT |
243 | return drm_gem_shmem_get_pages(shmem); |
244 | } | |
245 | EXPORT_SYMBOL(drm_gem_shmem_pin); | |
246 | ||
247 | /** | |
248 | * drm_gem_shmem_unpin - Unpin backing pages for a shmem GEM object | |
249 | * @obj: GEM object | |
250 | * | |
251 | * This function removes the requirement that the backing pages are pinned in | |
0b638559 | 252 | * memory. It should only be used to implement &drm_gem_object_funcs.unpin. |
2194a63a NT |
253 | */ |
254 | void drm_gem_shmem_unpin(struct drm_gem_object *obj) | |
255 | { | |
256 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
257 | ||
52640835 DV |
258 | WARN_ON(shmem->base.import_attach); |
259 | ||
2194a63a NT |
260 | drm_gem_shmem_put_pages(shmem); |
261 | } | |
262 | EXPORT_SYMBOL(drm_gem_shmem_unpin); | |
263 | ||
49a3f51d | 264 | static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem, struct dma_buf_map *map) |
2194a63a NT |
265 | { |
266 | struct drm_gem_object *obj = &shmem->base; | |
6619ccf1 | 267 | int ret = 0; |
2194a63a | 268 | |
49a3f51d TZ |
269 | if (shmem->vmap_use_count++ > 0) { |
270 | dma_buf_map_set_vaddr(map, shmem->vaddr); | |
271 | return 0; | |
272 | } | |
2194a63a | 273 | |
1cad6292 | 274 | if (obj->import_attach) { |
49a3f51d TZ |
275 | ret = dma_buf_vmap(obj->import_attach->dmabuf, map); |
276 | if (!ret) { | |
277 | if (WARN_ON(map->is_iomem)) { | |
278 | ret = -EIO; | |
279 | goto err_put_pages; | |
280 | } | |
281 | shmem->vaddr = map->vaddr; | |
282 | } | |
1cad6292 GH |
283 | } else { |
284 | pgprot_t prot = PAGE_KERNEL; | |
285 | ||
0cc5fb4e DV |
286 | ret = drm_gem_shmem_get_pages(shmem); |
287 | if (ret) | |
288 | goto err_zero_use; | |
289 | ||
0cf2ef46 | 290 | if (shmem->map_wc) |
1cad6292 | 291 | prot = pgprot_writecombine(prot); |
be7d9f05 | 292 | shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT, |
1cad6292 | 293 | VM_MAP, prot); |
6619ccf1 TZ |
294 | if (!shmem->vaddr) |
295 | ret = -ENOMEM; | |
49a3f51d TZ |
296 | else |
297 | dma_buf_map_set_vaddr(map, shmem->vaddr); | |
1cad6292 | 298 | } |
2194a63a | 299 | |
6619ccf1 TZ |
300 | if (ret) { |
301 | DRM_DEBUG_KMS("Failed to vmap pages, error %d\n", ret); | |
2194a63a NT |
302 | goto err_put_pages; |
303 | } | |
304 | ||
49a3f51d | 305 | return 0; |
2194a63a NT |
306 | |
307 | err_put_pages: | |
0cc5fb4e DV |
308 | if (!obj->import_attach) |
309 | drm_gem_shmem_put_pages(shmem); | |
2194a63a NT |
310 | err_zero_use: |
311 | shmem->vmap_use_count = 0; | |
312 | ||
49a3f51d | 313 | return ret; |
2194a63a NT |
314 | } |
315 | ||
316 | /* | |
317 | * drm_gem_shmem_vmap - Create a virtual mapping for a shmem GEM object | |
318 | * @shmem: shmem GEM object | |
49a3f51d TZ |
319 | * @map: Returns the kernel virtual address of the SHMEM GEM object's backing |
320 | * store. | |
2194a63a | 321 | * |
0b638559 DV |
322 | * This function makes sure that a contiguous kernel virtual address mapping |
323 | * exists for the buffer backing the shmem GEM object. | |
324 | * | |
325 | * This function can be used to implement &drm_gem_object_funcs.vmap. But it can | |
326 | * also be called by drivers directly, in which case it will hide the | |
327 | * differences between dma-buf imported and natively allocated objects. | |
328 | * | |
329 | * Acquired mappings should be cleaned up by calling drm_gem_shmem_vunmap(). | |
2194a63a NT |
330 | * |
331 | * Returns: | |
332 | * 0 on success or a negative error code on failure. | |
333 | */ | |
49a3f51d | 334 | int drm_gem_shmem_vmap(struct drm_gem_object *obj, struct dma_buf_map *map) |
2194a63a NT |
335 | { |
336 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
2194a63a NT |
337 | int ret; |
338 | ||
339 | ret = mutex_lock_interruptible(&shmem->vmap_lock); | |
340 | if (ret) | |
49a3f51d TZ |
341 | return ret; |
342 | ret = drm_gem_shmem_vmap_locked(shmem, map); | |
2194a63a NT |
343 | mutex_unlock(&shmem->vmap_lock); |
344 | ||
49a3f51d | 345 | return ret; |
2194a63a NT |
346 | } |
347 | EXPORT_SYMBOL(drm_gem_shmem_vmap); | |
348 | ||
49a3f51d TZ |
349 | static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem, |
350 | struct dma_buf_map *map) | |
2194a63a NT |
351 | { |
352 | struct drm_gem_object *obj = &shmem->base; | |
353 | ||
354 | if (WARN_ON_ONCE(!shmem->vmap_use_count)) | |
355 | return; | |
356 | ||
357 | if (--shmem->vmap_use_count > 0) | |
358 | return; | |
359 | ||
64e194e2 | 360 | if (obj->import_attach) { |
49a3f51d | 361 | dma_buf_vunmap(obj->import_attach->dmabuf, map); |
64e194e2 | 362 | } else { |
2194a63a | 363 | vunmap(shmem->vaddr); |
64e194e2 NT |
364 | drm_gem_shmem_put_pages(shmem); |
365 | } | |
2194a63a NT |
366 | |
367 | shmem->vaddr = NULL; | |
2194a63a NT |
368 | } |
369 | ||
370 | /* | |
0ae865ef | 371 | * drm_gem_shmem_vunmap - Unmap a virtual mapping for a shmem GEM object |
2194a63a | 372 | * @shmem: shmem GEM object |
49a3f51d | 373 | * @map: Kernel virtual address where the SHMEM GEM object was mapped |
2194a63a | 374 | * |
0b638559 DV |
375 | * This function cleans up a kernel virtual address mapping acquired by |
376 | * drm_gem_shmem_vmap(). The mapping is only removed when the use count drops to | |
377 | * zero. | |
378 | * | |
379 | * This function can be used to implement &drm_gem_object_funcs.vmap. But it can | |
380 | * also be called by drivers directly, in which case it will hide the | |
381 | * differences between dma-buf imported and natively allocated objects. | |
2194a63a | 382 | */ |
49a3f51d | 383 | void drm_gem_shmem_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map) |
2194a63a NT |
384 | { |
385 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
386 | ||
387 | mutex_lock(&shmem->vmap_lock); | |
49a3f51d | 388 | drm_gem_shmem_vunmap_locked(shmem, map); |
2194a63a NT |
389 | mutex_unlock(&shmem->vmap_lock); |
390 | } | |
391 | EXPORT_SYMBOL(drm_gem_shmem_vunmap); | |
392 | ||
393 | struct drm_gem_shmem_object * | |
394 | drm_gem_shmem_create_with_handle(struct drm_file *file_priv, | |
395 | struct drm_device *dev, size_t size, | |
396 | uint32_t *handle) | |
397 | { | |
398 | struct drm_gem_shmem_object *shmem; | |
399 | int ret; | |
400 | ||
cfe28f90 | 401 | shmem = drm_gem_shmem_create(dev, size); |
2194a63a NT |
402 | if (IS_ERR(shmem)) |
403 | return shmem; | |
404 | ||
405 | /* | |
406 | * Allocate an id of idr table where the obj is registered | |
407 | * and handle has the id what user can see. | |
408 | */ | |
409 | ret = drm_gem_handle_create(file_priv, &shmem->base, handle); | |
410 | /* drop reference from allocate - handle holds it now. */ | |
be6ee102 | 411 | drm_gem_object_put(&shmem->base); |
2194a63a NT |
412 | if (ret) |
413 | return ERR_PTR(ret); | |
414 | ||
415 | return shmem; | |
416 | } | |
417 | EXPORT_SYMBOL(drm_gem_shmem_create_with_handle); | |
418 | ||
17acb9f3 RH |
419 | /* Update madvise status, returns true if not purged, else |
420 | * false or -errno. | |
421 | */ | |
422 | int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv) | |
423 | { | |
424 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
425 | ||
426 | mutex_lock(&shmem->pages_lock); | |
427 | ||
428 | if (shmem->madv >= 0) | |
429 | shmem->madv = madv; | |
430 | ||
431 | madv = shmem->madv; | |
432 | ||
433 | mutex_unlock(&shmem->pages_lock); | |
434 | ||
435 | return (madv >= 0); | |
436 | } | |
437 | EXPORT_SYMBOL(drm_gem_shmem_madvise); | |
438 | ||
439 | void drm_gem_shmem_purge_locked(struct drm_gem_object *obj) | |
440 | { | |
441 | struct drm_device *dev = obj->dev; | |
442 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
443 | ||
444 | WARN_ON(!drm_gem_shmem_is_purgeable(shmem)); | |
445 | ||
6c6fa39c | 446 | dma_unmap_sgtable(obj->dev->dev, shmem->sgt, DMA_BIDIRECTIONAL, 0); |
4fa3d66f RH |
447 | sg_free_table(shmem->sgt); |
448 | kfree(shmem->sgt); | |
449 | shmem->sgt = NULL; | |
450 | ||
17acb9f3 RH |
451 | drm_gem_shmem_put_pages_locked(shmem); |
452 | ||
453 | shmem->madv = -1; | |
454 | ||
455 | drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping); | |
456 | drm_gem_free_mmap_offset(obj); | |
457 | ||
458 | /* Our goal here is to return as much of the memory as | |
459 | * is possible back to the system as we are called from OOM. | |
460 | * To do this we must instruct the shmfs to drop all of its | |
461 | * backing pages, *now*. | |
462 | */ | |
463 | shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1); | |
464 | ||
465 | invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, | |
466 | 0, (loff_t)-1); | |
467 | } | |
468 | EXPORT_SYMBOL(drm_gem_shmem_purge_locked); | |
469 | ||
dfbc7a46 | 470 | bool drm_gem_shmem_purge(struct drm_gem_object *obj) |
17acb9f3 RH |
471 | { |
472 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
473 | ||
dfbc7a46 RH |
474 | if (!mutex_trylock(&shmem->pages_lock)) |
475 | return false; | |
17acb9f3 RH |
476 | drm_gem_shmem_purge_locked(obj); |
477 | mutex_unlock(&shmem->pages_lock); | |
dfbc7a46 RH |
478 | |
479 | return true; | |
17acb9f3 RH |
480 | } |
481 | EXPORT_SYMBOL(drm_gem_shmem_purge); | |
482 | ||
2194a63a NT |
483 | /** |
484 | * drm_gem_shmem_dumb_create - Create a dumb shmem buffer object | |
485 | * @file: DRM file structure to create the dumb buffer for | |
486 | * @dev: DRM device | |
487 | * @args: IOCTL data | |
488 | * | |
489 | * This function computes the pitch of the dumb buffer and rounds it up to an | |
490 | * integer number of bytes per pixel. Drivers for hardware that doesn't have | |
491 | * any additional restrictions on the pitch can directly use this function as | |
492 | * their &drm_driver.dumb_create callback. | |
493 | * | |
494 | * For hardware with additional restrictions, drivers can adjust the fields | |
495 | * set up by userspace before calling into this function. | |
496 | * | |
497 | * Returns: | |
498 | * 0 on success or a negative error code on failure. | |
499 | */ | |
500 | int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
501 | struct drm_mode_create_dumb *args) | |
502 | { | |
503 | u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); | |
504 | struct drm_gem_shmem_object *shmem; | |
505 | ||
506 | if (!args->pitch || !args->size) { | |
507 | args->pitch = min_pitch; | |
35d28365 | 508 | args->size = PAGE_ALIGN(args->pitch * args->height); |
2194a63a NT |
509 | } else { |
510 | /* ensure sane minimum values */ | |
511 | if (args->pitch < min_pitch) | |
512 | args->pitch = min_pitch; | |
513 | if (args->size < args->pitch * args->height) | |
35d28365 | 514 | args->size = PAGE_ALIGN(args->pitch * args->height); |
2194a63a NT |
515 | } |
516 | ||
517 | shmem = drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle); | |
518 | ||
519 | return PTR_ERR_OR_ZERO(shmem); | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create); | |
522 | ||
523 | static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf) | |
524 | { | |
525 | struct vm_area_struct *vma = vmf->vma; | |
526 | struct drm_gem_object *obj = vma->vm_private_data; | |
527 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
528 | loff_t num_pages = obj->size >> PAGE_SHIFT; | |
d611b4a0 | 529 | vm_fault_t ret; |
2194a63a | 530 | struct page *page; |
11d5a474 NR |
531 | pgoff_t page_offset; |
532 | ||
533 | /* We don't use vmf->pgoff since that has the fake offset */ | |
534 | page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; | |
2194a63a | 535 | |
d611b4a0 NR |
536 | mutex_lock(&shmem->pages_lock); |
537 | ||
11d5a474 | 538 | if (page_offset >= num_pages || |
d611b4a0 NR |
539 | WARN_ON_ONCE(!shmem->pages) || |
540 | shmem->madv < 0) { | |
541 | ret = VM_FAULT_SIGBUS; | |
542 | } else { | |
11d5a474 | 543 | page = shmem->pages[page_offset]; |
2194a63a | 544 | |
d611b4a0 NR |
545 | ret = vmf_insert_page(vma, vmf->address, page); |
546 | } | |
2194a63a | 547 | |
d611b4a0 NR |
548 | mutex_unlock(&shmem->pages_lock); |
549 | ||
550 | return ret; | |
2194a63a NT |
551 | } |
552 | ||
553 | static void drm_gem_shmem_vm_open(struct vm_area_struct *vma) | |
554 | { | |
555 | struct drm_gem_object *obj = vma->vm_private_data; | |
556 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
557 | int ret; | |
558 | ||
52640835 DV |
559 | WARN_ON(shmem->base.import_attach); |
560 | ||
2194a63a NT |
561 | ret = drm_gem_shmem_get_pages(shmem); |
562 | WARN_ON_ONCE(ret != 0); | |
563 | ||
564 | drm_gem_vm_open(vma); | |
565 | } | |
566 | ||
567 | static void drm_gem_shmem_vm_close(struct vm_area_struct *vma) | |
568 | { | |
569 | struct drm_gem_object *obj = vma->vm_private_data; | |
570 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
571 | ||
572 | drm_gem_shmem_put_pages(shmem); | |
573 | drm_gem_vm_close(vma); | |
574 | } | |
575 | ||
0be89589 | 576 | static const struct vm_operations_struct drm_gem_shmem_vm_ops = { |
2194a63a NT |
577 | .fault = drm_gem_shmem_fault, |
578 | .open = drm_gem_shmem_vm_open, | |
579 | .close = drm_gem_shmem_vm_close, | |
580 | }; | |
2194a63a NT |
581 | |
582 | /** | |
583 | * drm_gem_shmem_mmap - Memory-map a shmem GEM object | |
0be89589 | 584 | * @obj: gem object |
2194a63a NT |
585 | * @vma: VMA for the area to be mapped |
586 | * | |
587 | * This function implements an augmented version of the GEM DRM file mmap | |
588 | * operation for shmem objects. Drivers which employ the shmem helpers should | |
0be89589 | 589 | * use this function as their &drm_gem_object_funcs.mmap handler. |
2194a63a NT |
590 | * |
591 | * Returns: | |
592 | * 0 on success or a negative error code on failure. | |
593 | */ | |
0be89589 | 594 | int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) |
2194a63a NT |
595 | { |
596 | struct drm_gem_shmem_object *shmem; | |
597 | int ret; | |
598 | ||
f49a51bf DV |
599 | if (obj->import_attach) { |
600 | /* Drop the reference drm_gem_mmap_obj() acquired.*/ | |
601 | drm_gem_object_put(obj); | |
602 | vma->vm_private_data = NULL; | |
603 | ||
26d3ac3c | 604 | return dma_buf_mmap(obj->dma_buf, vma, 0); |
f49a51bf | 605 | } |
26d3ac3c | 606 | |
0be89589 | 607 | shmem = to_drm_gem_shmem_obj(obj); |
2194a63a NT |
608 | |
609 | ret = drm_gem_shmem_get_pages(shmem); | |
610 | if (ret) { | |
611 | drm_gem_vm_close(vma); | |
612 | return ret; | |
613 | } | |
614 | ||
1bf01e1e | 615 | vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; |
1cad6292 | 616 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
0cf2ef46 | 617 | if (shmem->map_wc) |
1cad6292 | 618 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
0be89589 | 619 | vma->vm_ops = &drm_gem_shmem_vm_ops; |
2194a63a | 620 | |
2194a63a NT |
621 | return 0; |
622 | } | |
623 | EXPORT_SYMBOL_GPL(drm_gem_shmem_mmap); | |
624 | ||
625 | /** | |
626 | * drm_gem_shmem_print_info() - Print &drm_gem_shmem_object info for debugfs | |
627 | * @p: DRM printer | |
628 | * @indent: Tab indentation level | |
629 | * @obj: GEM object | |
0b638559 DV |
630 | * |
631 | * This implements the &drm_gem_object_funcs.info callback. | |
2194a63a NT |
632 | */ |
633 | void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent, | |
634 | const struct drm_gem_object *obj) | |
635 | { | |
636 | const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
637 | ||
638 | drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count); | |
639 | drm_printf_indent(p, indent, "vmap_use_count=%u\n", shmem->vmap_use_count); | |
640 | drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr); | |
641 | } | |
642 | EXPORT_SYMBOL(drm_gem_shmem_print_info); | |
643 | ||
644 | /** | |
645 | * drm_gem_shmem_get_sg_table - Provide a scatter/gather table of pinned | |
646 | * pages for a shmem GEM object | |
647 | * @obj: GEM object | |
648 | * | |
649 | * This function exports a scatter/gather table suitable for PRIME usage by | |
0b638559 DV |
650 | * calling the standard DMA mapping API. Drivers should not call this function |
651 | * directly, instead it should only be used as an implementation for | |
652 | * &drm_gem_object_funcs.get_sg_table. | |
653 | * | |
654 | * Drivers who need to acquire an scatter/gather table for objects need to call | |
655 | * drm_gem_shmem_get_pages_sgt() instead. | |
2194a63a NT |
656 | * |
657 | * Returns: | |
658 | * A pointer to the scatter/gather table of pinned pages or NULL on failure. | |
659 | */ | |
660 | struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj) | |
661 | { | |
662 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
663 | ||
52640835 DV |
664 | WARN_ON(shmem->base.import_attach); |
665 | ||
707d561f | 666 | return drm_prime_pages_to_sg(obj->dev, shmem->pages, obj->size >> PAGE_SHIFT); |
2194a63a NT |
667 | } |
668 | EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table); | |
669 | ||
670 | /** | |
671 | * drm_gem_shmem_get_pages_sgt - Pin pages, dma map them, and return a | |
672 | * scatter/gather table for a shmem GEM object. | |
673 | * @obj: GEM object | |
674 | * | |
675 | * This function returns a scatter/gather table suitable for driver usage. If | |
676 | * the sg table doesn't exist, the pages are pinned, dma-mapped, and a sg | |
677 | * table created. | |
678 | * | |
0b638559 DV |
679 | * This is the main function for drivers to get at backing storage, and it hides |
680 | * and difference between dma-buf imported and natively allocated objects. | |
681 | * drm_gem_shmem_get_sg_table() should not be directly called by drivers. | |
682 | * | |
2194a63a NT |
683 | * Returns: |
684 | * A pointer to the scatter/gather table of pinned pages or errno on failure. | |
685 | */ | |
686 | struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj) | |
687 | { | |
688 | int ret; | |
689 | struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | |
690 | struct sg_table *sgt; | |
691 | ||
692 | if (shmem->sgt) | |
693 | return shmem->sgt; | |
694 | ||
695 | WARN_ON(obj->import_attach); | |
696 | ||
697 | ret = drm_gem_shmem_get_pages(shmem); | |
698 | if (ret) | |
699 | return ERR_PTR(ret); | |
700 | ||
701 | sgt = drm_gem_shmem_get_sg_table(&shmem->base); | |
702 | if (IS_ERR(sgt)) { | |
703 | ret = PTR_ERR(sgt); | |
704 | goto err_put_pages; | |
705 | } | |
706 | /* Map the pages for use by the h/w. */ | |
6c6fa39c MS |
707 | ret = dma_map_sgtable(obj->dev->dev, sgt, DMA_BIDIRECTIONAL, 0); |
708 | if (ret) | |
709 | goto err_free_sgt; | |
2194a63a NT |
710 | |
711 | shmem->sgt = sgt; | |
712 | ||
713 | return sgt; | |
714 | ||
6c6fa39c MS |
715 | err_free_sgt: |
716 | sg_free_table(sgt); | |
717 | kfree(sgt); | |
2194a63a NT |
718 | err_put_pages: |
719 | drm_gem_shmem_put_pages(shmem); | |
720 | return ERR_PTR(ret); | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages_sgt); | |
723 | ||
724 | /** | |
725 | * drm_gem_shmem_prime_import_sg_table - Produce a shmem GEM object from | |
726 | * another driver's scatter/gather table of pinned pages | |
727 | * @dev: Device to import into | |
728 | * @attach: DMA-BUF attachment | |
729 | * @sgt: Scatter/gather table of pinned pages | |
730 | * | |
731 | * This function imports a scatter/gather table exported via DMA-BUF by | |
732 | * another driver. Drivers that use the shmem helpers should set this as their | |
733 | * &drm_driver.gem_prime_import_sg_table callback. | |
734 | * | |
735 | * Returns: | |
736 | * A pointer to a newly created GEM object or an ERR_PTR-encoded negative | |
737 | * error code on failure. | |
738 | */ | |
739 | struct drm_gem_object * | |
740 | drm_gem_shmem_prime_import_sg_table(struct drm_device *dev, | |
741 | struct dma_buf_attachment *attach, | |
742 | struct sg_table *sgt) | |
743 | { | |
744 | size_t size = PAGE_ALIGN(attach->dmabuf->size); | |
2194a63a | 745 | struct drm_gem_shmem_object *shmem; |
2194a63a | 746 | |
cfe28f90 | 747 | shmem = __drm_gem_shmem_create(dev, size, true); |
2194a63a NT |
748 | if (IS_ERR(shmem)) |
749 | return ERR_CAST(shmem); | |
750 | ||
2194a63a | 751 | shmem->sgt = sgt; |
2194a63a NT |
752 | |
753 | DRM_DEBUG_PRIME("size = %zu\n", size); | |
754 | ||
755 | return &shmem->base; | |
2194a63a NT |
756 | } |
757 | EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table); |