Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * drm gem framebuffer helper functions
4 : *
5 : * Copyright (C) 2017 Noralf Trønnes
6 : */
7 :
8 : #include <linux/slab.h>
9 : #include <linux/module.h>
10 :
11 : #include <drm/drm_damage_helper.h>
12 : #include <drm/drm_fourcc.h>
13 : #include <drm/drm_framebuffer.h>
14 : #include <drm/drm_gem.h>
15 : #include <drm/drm_gem_framebuffer_helper.h>
16 : #include <drm/drm_modeset_helper.h>
17 :
18 : #include "drm_internal.h"
19 :
20 : MODULE_IMPORT_NS(DMA_BUF);
21 :
22 : #define AFBC_HEADER_SIZE 16
23 : #define AFBC_TH_LAYOUT_ALIGNMENT 8
24 : #define AFBC_HDR_ALIGN 64
25 : #define AFBC_SUPERBLOCK_PIXELS 256
26 : #define AFBC_SUPERBLOCK_ALIGNMENT 128
27 : #define AFBC_TH_BODY_START_ALIGNMENT 4096
28 :
29 : /**
30 : * DOC: overview
31 : *
32 : * This library provides helpers for drivers that don't subclass
33 : * &drm_framebuffer and use &drm_gem_object for their backing storage.
34 : *
35 : * Drivers without additional needs to validate framebuffers can simply use
36 : * drm_gem_fb_create() and everything is wired up automatically. Other drivers
37 : * can use all parts independently.
38 : */
39 :
40 : /**
41 : * drm_gem_fb_get_obj() - Get GEM object backing the framebuffer
42 : * @fb: Framebuffer
43 : * @plane: Plane index
44 : *
45 : * No additional reference is taken beyond the one that the &drm_frambuffer
46 : * already holds.
47 : *
48 : * Returns:
49 : * Pointer to &drm_gem_object for the given framebuffer and plane index or NULL
50 : * if it does not exist.
51 : */
52 0 : struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
53 : unsigned int plane)
54 : {
55 0 : struct drm_device *dev = fb->dev;
56 :
57 0 : if (drm_WARN_ON_ONCE(dev, plane >= ARRAY_SIZE(fb->obj)))
58 : return NULL;
59 0 : else if (drm_WARN_ON_ONCE(dev, !fb->obj[plane]))
60 : return NULL;
61 :
62 0 : return fb->obj[plane];
63 : }
64 : EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
65 :
66 : static int
67 0 : drm_gem_fb_init(struct drm_device *dev,
68 : struct drm_framebuffer *fb,
69 : const struct drm_mode_fb_cmd2 *mode_cmd,
70 : struct drm_gem_object **obj, unsigned int num_planes,
71 : const struct drm_framebuffer_funcs *funcs)
72 : {
73 : unsigned int i;
74 : int ret;
75 :
76 0 : drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
77 :
78 0 : for (i = 0; i < num_planes; i++)
79 0 : fb->obj[i] = obj[i];
80 :
81 0 : ret = drm_framebuffer_init(dev, fb, funcs);
82 0 : if (ret)
83 0 : drm_err(dev, "Failed to init framebuffer: %d\n", ret);
84 :
85 0 : return ret;
86 : }
87 :
88 : /**
89 : * drm_gem_fb_destroy - Free GEM backed framebuffer
90 : * @fb: Framebuffer
91 : *
92 : * Frees a GEM backed framebuffer with its backing buffer(s) and the structure
93 : * itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
94 : * callback.
95 : */
96 0 : void drm_gem_fb_destroy(struct drm_framebuffer *fb)
97 : {
98 : unsigned int i;
99 :
100 0 : for (i = 0; i < fb->format->num_planes; i++)
101 0 : drm_gem_object_put(fb->obj[i]);
102 :
103 0 : drm_framebuffer_cleanup(fb);
104 0 : kfree(fb);
105 0 : }
106 : EXPORT_SYMBOL(drm_gem_fb_destroy);
107 :
108 : /**
109 : * drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
110 : * @fb: Framebuffer
111 : * @file: DRM file to register the handle for
112 : * @handle: Pointer to return the created handle
113 : *
114 : * This function creates a handle for the GEM object backing the framebuffer.
115 : * Drivers can use this as their &drm_framebuffer_funcs->create_handle
116 : * callback. The GETFB IOCTL calls into this callback.
117 : *
118 : * Returns:
119 : * 0 on success or a negative error code on failure.
120 : */
121 0 : int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
122 : unsigned int *handle)
123 : {
124 0 : return drm_gem_handle_create(file, fb->obj[0], handle);
125 : }
126 : EXPORT_SYMBOL(drm_gem_fb_create_handle);
127 :
128 : /**
129 : * drm_gem_fb_init_with_funcs() - Helper function for implementing
130 : * &drm_mode_config_funcs.fb_create
131 : * callback in cases when the driver
132 : * allocates a subclass of
133 : * struct drm_framebuffer
134 : * @dev: DRM device
135 : * @fb: framebuffer object
136 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
137 : * @mode_cmd: Metadata from the userspace framebuffer creation request
138 : * @funcs: vtable to be used for the new framebuffer object
139 : *
140 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
141 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
142 : * change &drm_framebuffer_funcs. The function does buffer size validation.
143 : * The buffer size validation is for a general case, though, so users should
144 : * pay attention to the checks being appropriate for them or, at least,
145 : * non-conflicting.
146 : *
147 : * Returns:
148 : * Zero or a negative error code.
149 : */
150 0 : int drm_gem_fb_init_with_funcs(struct drm_device *dev,
151 : struct drm_framebuffer *fb,
152 : struct drm_file *file,
153 : const struct drm_mode_fb_cmd2 *mode_cmd,
154 : const struct drm_framebuffer_funcs *funcs)
155 : {
156 : const struct drm_format_info *info;
157 : struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
158 : unsigned int i;
159 : int ret;
160 :
161 0 : info = drm_get_format_info(dev, mode_cmd);
162 0 : if (!info) {
163 0 : drm_dbg_kms(dev, "Failed to get FB format info\n");
164 0 : return -EINVAL;
165 : }
166 :
167 0 : for (i = 0; i < info->num_planes; i++) {
168 0 : unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
169 0 : unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
170 : unsigned int min_size;
171 :
172 0 : objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
173 0 : if (!objs[i]) {
174 0 : drm_dbg_kms(dev, "Failed to lookup GEM object\n");
175 0 : ret = -ENOENT;
176 0 : goto err_gem_object_put;
177 : }
178 :
179 0 : min_size = (height - 1) * mode_cmd->pitches[i]
180 0 : + drm_format_info_min_pitch(info, i, width)
181 0 : + mode_cmd->offsets[i];
182 :
183 0 : if (objs[i]->size < min_size) {
184 0 : drm_dbg_kms(dev,
185 : "GEM object size (%zu) smaller than minimum size (%u) for plane %d\n",
186 : objs[i]->size, min_size, i);
187 0 : drm_gem_object_put(objs[i]);
188 : ret = -EINVAL;
189 : goto err_gem_object_put;
190 : }
191 : }
192 :
193 0 : ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs);
194 0 : if (ret)
195 : goto err_gem_object_put;
196 :
197 : return 0;
198 :
199 : err_gem_object_put:
200 0 : while (i > 0) {
201 0 : --i;
202 0 : drm_gem_object_put(objs[i]);
203 : }
204 : return ret;
205 : }
206 : EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
207 :
208 : /**
209 : * drm_gem_fb_create_with_funcs() - Helper function for the
210 : * &drm_mode_config_funcs.fb_create
211 : * callback
212 : * @dev: DRM device
213 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
214 : * @mode_cmd: Metadata from the userspace framebuffer creation request
215 : * @funcs: vtable to be used for the new framebuffer object
216 : *
217 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
218 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
219 : * change &drm_framebuffer_funcs. The function does buffer size validation.
220 : *
221 : * Returns:
222 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
223 : */
224 : struct drm_framebuffer *
225 0 : drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
226 : const struct drm_mode_fb_cmd2 *mode_cmd,
227 : const struct drm_framebuffer_funcs *funcs)
228 : {
229 : struct drm_framebuffer *fb;
230 : int ret;
231 :
232 0 : fb = kzalloc(sizeof(*fb), GFP_KERNEL);
233 0 : if (!fb)
234 : return ERR_PTR(-ENOMEM);
235 :
236 0 : ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs);
237 0 : if (ret) {
238 0 : kfree(fb);
239 0 : return ERR_PTR(ret);
240 : }
241 :
242 : return fb;
243 : }
244 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
245 :
246 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
247 : .destroy = drm_gem_fb_destroy,
248 : .create_handle = drm_gem_fb_create_handle,
249 : };
250 :
251 : /**
252 : * drm_gem_fb_create() - Helper function for the
253 : * &drm_mode_config_funcs.fb_create callback
254 : * @dev: DRM device
255 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
256 : * @mode_cmd: Metadata from the userspace framebuffer creation request
257 : *
258 : * This function creates a new framebuffer object described by
259 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
260 : * backing the framebuffer.
261 : *
262 : * If your hardware has special alignment or pitch requirements these should be
263 : * checked before calling this function. The function does buffer size
264 : * validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
265 : * flushing.
266 : *
267 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
268 : * The ADDFB2 IOCTL calls into this callback.
269 : *
270 : * Returns:
271 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
272 : */
273 : struct drm_framebuffer *
274 0 : drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
275 : const struct drm_mode_fb_cmd2 *mode_cmd)
276 : {
277 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
278 : &drm_gem_fb_funcs);
279 : }
280 : EXPORT_SYMBOL_GPL(drm_gem_fb_create);
281 :
282 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
283 : .destroy = drm_gem_fb_destroy,
284 : .create_handle = drm_gem_fb_create_handle,
285 : .dirty = drm_atomic_helper_dirtyfb,
286 : };
287 :
288 : /**
289 : * drm_gem_fb_create_with_dirty() - Helper function for the
290 : * &drm_mode_config_funcs.fb_create callback
291 : * @dev: DRM device
292 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
293 : * @mode_cmd: Metadata from the userspace framebuffer creation request
294 : *
295 : * This function creates a new framebuffer object described by
296 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
297 : * backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
298 : * callback giving framebuffer flushing through the atomic machinery. Use
299 : * drm_gem_fb_create() if you don't need the dirty callback.
300 : * The function does buffer size validation.
301 : *
302 : * Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
303 : * to enable userspace to use damage clips also with the ATOMIC IOCTL.
304 : *
305 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
306 : * The ADDFB2 IOCTL calls into this callback.
307 : *
308 : * Returns:
309 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
310 : */
311 : struct drm_framebuffer *
312 0 : drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
313 : const struct drm_mode_fb_cmd2 *mode_cmd)
314 : {
315 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
316 : &drm_gem_fb_funcs_dirtyfb);
317 : }
318 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
319 :
320 : /**
321 : * drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
322 : * @fb: the framebuffer
323 : * @map: returns the mapping's address for each BO
324 : * @data: returns the data address for each BO, can be NULL
325 : *
326 : * This function maps all buffer objects of the given framebuffer into
327 : * kernel address space and stores them in struct iosys_map. If the
328 : * mapping operation fails for one of the BOs, the function unmaps the
329 : * already established mappings automatically.
330 : *
331 : * Callers that want to access a BO's stored data should pass @data.
332 : * The argument returns the addresses of the data stored in each BO. This
333 : * is different from @map if the framebuffer's offsets field is non-zero.
334 : *
335 : * Both, @map and @data, must each refer to arrays with at least
336 : * fb->format->num_planes elements.
337 : *
338 : * See drm_gem_fb_vunmap() for unmapping.
339 : *
340 : * Returns:
341 : * 0 on success, or a negative errno code otherwise.
342 : */
343 0 : int drm_gem_fb_vmap(struct drm_framebuffer *fb, struct iosys_map *map,
344 : struct iosys_map *data)
345 : {
346 : struct drm_gem_object *obj;
347 : unsigned int i;
348 : int ret;
349 :
350 0 : for (i = 0; i < fb->format->num_planes; ++i) {
351 0 : obj = drm_gem_fb_get_obj(fb, i);
352 0 : if (!obj) {
353 : ret = -EINVAL;
354 : goto err_drm_gem_vunmap;
355 : }
356 0 : ret = drm_gem_vmap_unlocked(obj, &map[i]);
357 0 : if (ret)
358 : goto err_drm_gem_vunmap;
359 : }
360 :
361 0 : if (data) {
362 0 : for (i = 0; i < fb->format->num_planes; ++i) {
363 0 : memcpy(&data[i], &map[i], sizeof(data[i]));
364 0 : if (iosys_map_is_null(&data[i]))
365 0 : continue;
366 0 : iosys_map_incr(&data[i], fb->offsets[i]);
367 : }
368 : }
369 :
370 : return 0;
371 :
372 : err_drm_gem_vunmap:
373 0 : while (i) {
374 0 : --i;
375 0 : obj = drm_gem_fb_get_obj(fb, i);
376 0 : if (!obj)
377 0 : continue;
378 0 : drm_gem_vunmap_unlocked(obj, &map[i]);
379 : }
380 : return ret;
381 : }
382 : EXPORT_SYMBOL(drm_gem_fb_vmap);
383 :
384 : /**
385 : * drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
386 : * @fb: the framebuffer
387 : * @map: mapping addresses as returned by drm_gem_fb_vmap()
388 : *
389 : * This function unmaps all buffer objects of the given framebuffer.
390 : *
391 : * See drm_gem_fb_vmap() for more information.
392 : */
393 0 : void drm_gem_fb_vunmap(struct drm_framebuffer *fb, struct iosys_map *map)
394 : {
395 0 : unsigned int i = fb->format->num_planes;
396 : struct drm_gem_object *obj;
397 :
398 0 : while (i) {
399 0 : --i;
400 0 : obj = drm_gem_fb_get_obj(fb, i);
401 0 : if (!obj)
402 0 : continue;
403 0 : if (iosys_map_is_null(&map[i]))
404 0 : continue;
405 0 : drm_gem_vunmap_unlocked(obj, &map[i]);
406 : }
407 0 : }
408 : EXPORT_SYMBOL(drm_gem_fb_vunmap);
409 :
410 0 : static void __drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir,
411 : unsigned int num_planes)
412 : {
413 : struct dma_buf_attachment *import_attach;
414 : struct drm_gem_object *obj;
415 : int ret;
416 :
417 0 : while (num_planes) {
418 0 : --num_planes;
419 0 : obj = drm_gem_fb_get_obj(fb, num_planes);
420 0 : if (!obj)
421 0 : continue;
422 0 : import_attach = obj->import_attach;
423 0 : if (!import_attach)
424 0 : continue;
425 0 : ret = dma_buf_end_cpu_access(import_attach->dmabuf, dir);
426 0 : if (ret)
427 0 : drm_err(fb->dev, "dma_buf_end_cpu_access(%u, %d) failed: %d\n",
428 : ret, num_planes, dir);
429 : }
430 0 : }
431 :
432 : /**
433 : * drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
434 : * @fb: the framebuffer
435 : * @dir: access mode
436 : *
437 : * Prepares a framebuffer's GEM buffer objects for CPU access. This function
438 : * must be called before accessing the BO data within the kernel. For imported
439 : * BOs, the function calls dma_buf_begin_cpu_access().
440 : *
441 : * See drm_gem_fb_end_cpu_access() for signalling the end of CPU access.
442 : *
443 : * Returns:
444 : * 0 on success, or a negative errno code otherwise.
445 : */
446 0 : int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
447 : {
448 : struct dma_buf_attachment *import_attach;
449 : struct drm_gem_object *obj;
450 : unsigned int i;
451 : int ret;
452 :
453 0 : for (i = 0; i < fb->format->num_planes; ++i) {
454 0 : obj = drm_gem_fb_get_obj(fb, i);
455 0 : if (!obj) {
456 : ret = -EINVAL;
457 : goto err___drm_gem_fb_end_cpu_access;
458 : }
459 0 : import_attach = obj->import_attach;
460 0 : if (!import_attach)
461 0 : continue;
462 0 : ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir);
463 0 : if (ret)
464 : goto err___drm_gem_fb_end_cpu_access;
465 : }
466 :
467 : return 0;
468 :
469 : err___drm_gem_fb_end_cpu_access:
470 0 : __drm_gem_fb_end_cpu_access(fb, dir, i);
471 0 : return ret;
472 : }
473 : EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access);
474 :
475 : /**
476 : * drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects
477 : * @fb: the framebuffer
478 : * @dir: access mode
479 : *
480 : * Signals the end of CPU access to the given framebuffer's GEM buffer objects. This
481 : * function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access().
482 : * For imported BOs, the function calls dma_buf_end_cpu_access().
483 : *
484 : * See also drm_gem_fb_begin_cpu_access().
485 : */
486 0 : void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
487 : {
488 0 : __drm_gem_fb_end_cpu_access(fb, dir, fb->format->num_planes);
489 0 : }
490 : EXPORT_SYMBOL(drm_gem_fb_end_cpu_access);
491 :
492 : // TODO Drop this function and replace by drm_format_info_bpp() once all
493 : // DRM_FORMAT_* provide proper block info in drivers/gpu/drm/drm_fourcc.c
494 0 : static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev,
495 : const struct drm_mode_fb_cmd2 *mode_cmd)
496 : {
497 : const struct drm_format_info *info;
498 :
499 0 : info = drm_get_format_info(dev, mode_cmd);
500 :
501 0 : switch (info->format) {
502 : case DRM_FORMAT_YUV420_8BIT:
503 : return 12;
504 : case DRM_FORMAT_YUV420_10BIT:
505 0 : return 15;
506 : case DRM_FORMAT_VUY101010:
507 0 : return 30;
508 : default:
509 0 : return drm_format_info_bpp(info, 0);
510 : }
511 : }
512 :
513 0 : static int drm_gem_afbc_min_size(struct drm_device *dev,
514 : const struct drm_mode_fb_cmd2 *mode_cmd,
515 : struct drm_afbc_framebuffer *afbc_fb)
516 : {
517 : __u32 n_blocks, w_alignment, h_alignment, hdr_alignment;
518 : /* remove bpp when all users properly encode cpp in drm_format_info */
519 : __u32 bpp;
520 :
521 0 : switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
522 : case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
523 0 : afbc_fb->block_width = 16;
524 0 : afbc_fb->block_height = 16;
525 0 : break;
526 : case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
527 0 : afbc_fb->block_width = 32;
528 0 : afbc_fb->block_height = 8;
529 0 : break;
530 : /* no user exists yet - fall through */
531 : case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4:
532 : case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4:
533 : default:
534 0 : drm_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
535 : mode_cmd->modifier[0]
536 : & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
537 0 : return -EINVAL;
538 : }
539 :
540 : /* tiled header afbc */
541 0 : w_alignment = afbc_fb->block_width;
542 0 : h_alignment = afbc_fb->block_height;
543 0 : hdr_alignment = AFBC_HDR_ALIGN;
544 0 : if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) {
545 0 : w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
546 0 : h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
547 0 : hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT;
548 : }
549 :
550 0 : afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment);
551 0 : afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment);
552 0 : afbc_fb->offset = mode_cmd->offsets[0];
553 :
554 0 : bpp = drm_gem_afbc_get_bpp(dev, mode_cmd);
555 0 : if (!bpp) {
556 0 : drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp);
557 0 : return -EINVAL;
558 : }
559 :
560 0 : n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height)
561 : / AFBC_SUPERBLOCK_PIXELS;
562 0 : afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment);
563 0 : afbc_fb->afbc_size += n_blocks * ALIGN(bpp * AFBC_SUPERBLOCK_PIXELS / 8,
564 : AFBC_SUPERBLOCK_ALIGNMENT);
565 :
566 0 : return 0;
567 : }
568 :
569 : /**
570 : * drm_gem_fb_afbc_init() - Helper function for drivers using afbc to
571 : * fill and validate all the afbc-specific
572 : * struct drm_afbc_framebuffer members
573 : *
574 : * @dev: DRM device
575 : * @afbc_fb: afbc-specific framebuffer
576 : * @mode_cmd: Metadata from the userspace framebuffer creation request
577 : * @afbc_fb: afbc framebuffer
578 : *
579 : * This function can be used by drivers which support afbc to complete
580 : * the preparation of struct drm_afbc_framebuffer. It must be called after
581 : * allocating the said struct and calling drm_gem_fb_init_with_funcs().
582 : * It is caller's responsibility to put afbc_fb->base.obj objects in case
583 : * the call is unsuccessful.
584 : *
585 : * Returns:
586 : * Zero on success or a negative error value on failure.
587 : */
588 0 : int drm_gem_fb_afbc_init(struct drm_device *dev,
589 : const struct drm_mode_fb_cmd2 *mode_cmd,
590 : struct drm_afbc_framebuffer *afbc_fb)
591 : {
592 : const struct drm_format_info *info;
593 : struct drm_gem_object **objs;
594 : int ret;
595 :
596 0 : objs = afbc_fb->base.obj;
597 0 : info = drm_get_format_info(dev, mode_cmd);
598 0 : if (!info)
599 : return -EINVAL;
600 :
601 0 : ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb);
602 0 : if (ret < 0)
603 : return ret;
604 :
605 0 : if (objs[0]->size < afbc_fb->afbc_size)
606 : return -EINVAL;
607 :
608 0 : return 0;
609 : }
610 : EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init);
|
