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_fb_helper.h>
13 : #include <drm/drm_fourcc.h>
14 : #include <drm/drm_framebuffer.h>
15 : #include <drm/drm_gem.h>
16 : #include <drm/drm_gem_framebuffer_helper.h>
17 : #include <drm/drm_modeset_helper.h>
18 :
19 : #include "drm_internal.h"
20 :
21 : MODULE_IMPORT_NS(DMA_BUF);
22 :
23 : #define AFBC_HEADER_SIZE 16
24 : #define AFBC_TH_LAYOUT_ALIGNMENT 8
25 : #define AFBC_HDR_ALIGN 64
26 : #define AFBC_SUPERBLOCK_PIXELS 256
27 : #define AFBC_SUPERBLOCK_ALIGNMENT 128
28 : #define AFBC_TH_BODY_START_ALIGNMENT 4096
29 :
30 : /**
31 : * DOC: overview
32 : *
33 : * This library provides helpers for drivers that don't subclass
34 : * &drm_framebuffer and use &drm_gem_object for their backing storage.
35 : *
36 : * Drivers without additional needs to validate framebuffers can simply use
37 : * drm_gem_fb_create() and everything is wired up automatically. Other drivers
38 : * can use all parts independently.
39 : */
40 :
41 : /**
42 : * drm_gem_fb_get_obj() - Get GEM object backing the framebuffer
43 : * @fb: Framebuffer
44 : * @plane: Plane index
45 : *
46 : * No additional reference is taken beyond the one that the &drm_frambuffer
47 : * already holds.
48 : *
49 : * Returns:
50 : * Pointer to &drm_gem_object for the given framebuffer and plane index or NULL
51 : * if it does not exist.
52 : */
53 0 : struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
54 : unsigned int plane)
55 : {
56 0 : if (plane >= ARRAY_SIZE(fb->obj))
57 : return NULL;
58 :
59 0 : return fb->obj[plane];
60 : }
61 : EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
62 :
63 : static int
64 0 : drm_gem_fb_init(struct drm_device *dev,
65 : struct drm_framebuffer *fb,
66 : const struct drm_mode_fb_cmd2 *mode_cmd,
67 : struct drm_gem_object **obj, unsigned int num_planes,
68 : const struct drm_framebuffer_funcs *funcs)
69 : {
70 : unsigned int i;
71 : int ret;
72 :
73 0 : drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
74 :
75 0 : for (i = 0; i < num_planes; i++)
76 0 : fb->obj[i] = obj[i];
77 :
78 0 : ret = drm_framebuffer_init(dev, fb, funcs);
79 0 : if (ret)
80 0 : drm_err(dev, "Failed to init framebuffer: %d\n", ret);
81 :
82 0 : return ret;
83 : }
84 :
85 : /**
86 : * drm_gem_fb_destroy - Free GEM backed framebuffer
87 : * @fb: Framebuffer
88 : *
89 : * Frees a GEM backed framebuffer with its backing buffer(s) and the structure
90 : * itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
91 : * callback.
92 : */
93 0 : void drm_gem_fb_destroy(struct drm_framebuffer *fb)
94 : {
95 : size_t i;
96 :
97 0 : for (i = 0; i < ARRAY_SIZE(fb->obj); i++)
98 0 : drm_gem_object_put(fb->obj[i]);
99 :
100 0 : drm_framebuffer_cleanup(fb);
101 0 : kfree(fb);
102 0 : }
103 : EXPORT_SYMBOL(drm_gem_fb_destroy);
104 :
105 : /**
106 : * drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
107 : * @fb: Framebuffer
108 : * @file: DRM file to register the handle for
109 : * @handle: Pointer to return the created handle
110 : *
111 : * This function creates a handle for the GEM object backing the framebuffer.
112 : * Drivers can use this as their &drm_framebuffer_funcs->create_handle
113 : * callback. The GETFB IOCTL calls into this callback.
114 : *
115 : * Returns:
116 : * 0 on success or a negative error code on failure.
117 : */
118 0 : int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
119 : unsigned int *handle)
120 : {
121 0 : return drm_gem_handle_create(file, fb->obj[0], handle);
122 : }
123 : EXPORT_SYMBOL(drm_gem_fb_create_handle);
124 :
125 : /**
126 : * drm_gem_fb_init_with_funcs() - Helper function for implementing
127 : * &drm_mode_config_funcs.fb_create
128 : * callback in cases when the driver
129 : * allocates a subclass of
130 : * struct drm_framebuffer
131 : * @dev: DRM device
132 : * @fb: framebuffer object
133 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
134 : * @mode_cmd: Metadata from the userspace framebuffer creation request
135 : * @funcs: vtable to be used for the new framebuffer object
136 : *
137 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
138 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
139 : * change &drm_framebuffer_funcs. The function does buffer size validation.
140 : * The buffer size validation is for a general case, though, so users should
141 : * pay attention to the checks being appropriate for them or, at least,
142 : * non-conflicting.
143 : *
144 : * Returns:
145 : * Zero or a negative error code.
146 : */
147 0 : int drm_gem_fb_init_with_funcs(struct drm_device *dev,
148 : struct drm_framebuffer *fb,
149 : struct drm_file *file,
150 : const struct drm_mode_fb_cmd2 *mode_cmd,
151 : const struct drm_framebuffer_funcs *funcs)
152 : {
153 : const struct drm_format_info *info;
154 : struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
155 : unsigned int i;
156 : int ret;
157 :
158 0 : info = drm_get_format_info(dev, mode_cmd);
159 0 : if (!info) {
160 0 : drm_dbg_kms(dev, "Failed to get FB format info\n");
161 0 : return -EINVAL;
162 : }
163 :
164 0 : for (i = 0; i < info->num_planes; i++) {
165 0 : unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
166 0 : unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
167 : unsigned int min_size;
168 :
169 0 : objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
170 0 : if (!objs[i]) {
171 0 : drm_dbg_kms(dev, "Failed to lookup GEM object\n");
172 0 : ret = -ENOENT;
173 0 : goto err_gem_object_put;
174 : }
175 :
176 0 : min_size = (height - 1) * mode_cmd->pitches[i]
177 0 : + drm_format_info_min_pitch(info, i, width)
178 0 : + mode_cmd->offsets[i];
179 :
180 0 : if (objs[i]->size < min_size) {
181 0 : drm_dbg_kms(dev,
182 : "GEM object size (%zu) smaller than minimum size (%u) for plane %d\n",
183 : objs[i]->size, min_size, i);
184 0 : drm_gem_object_put(objs[i]);
185 : ret = -EINVAL;
186 : goto err_gem_object_put;
187 : }
188 : }
189 :
190 0 : ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs);
191 0 : if (ret)
192 : goto err_gem_object_put;
193 :
194 : return 0;
195 :
196 : err_gem_object_put:
197 0 : while (i > 0) {
198 0 : --i;
199 0 : drm_gem_object_put(objs[i]);
200 : }
201 : return ret;
202 : }
203 : EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
204 :
205 : /**
206 : * drm_gem_fb_create_with_funcs() - Helper function for the
207 : * &drm_mode_config_funcs.fb_create
208 : * callback
209 : * @dev: DRM device
210 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
211 : * @mode_cmd: Metadata from the userspace framebuffer creation request
212 : * @funcs: vtable to be used for the new framebuffer object
213 : *
214 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
215 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
216 : * change &drm_framebuffer_funcs. The function does buffer size validation.
217 : *
218 : * Returns:
219 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
220 : */
221 : struct drm_framebuffer *
222 0 : drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
223 : const struct drm_mode_fb_cmd2 *mode_cmd,
224 : const struct drm_framebuffer_funcs *funcs)
225 : {
226 : struct drm_framebuffer *fb;
227 : int ret;
228 :
229 0 : fb = kzalloc(sizeof(*fb), GFP_KERNEL);
230 0 : if (!fb)
231 : return ERR_PTR(-ENOMEM);
232 :
233 0 : ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs);
234 0 : if (ret) {
235 0 : kfree(fb);
236 0 : return ERR_PTR(ret);
237 : }
238 :
239 : return fb;
240 : }
241 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
242 :
243 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
244 : .destroy = drm_gem_fb_destroy,
245 : .create_handle = drm_gem_fb_create_handle,
246 : };
247 :
248 : /**
249 : * drm_gem_fb_create() - Helper function for the
250 : * &drm_mode_config_funcs.fb_create callback
251 : * @dev: DRM device
252 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
253 : * @mode_cmd: Metadata from the userspace framebuffer creation request
254 : *
255 : * This function creates a new framebuffer object described by
256 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
257 : * backing the framebuffer.
258 : *
259 : * If your hardware has special alignment or pitch requirements these should be
260 : * checked before calling this function. The function does buffer size
261 : * validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
262 : * flushing.
263 : *
264 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
265 : * The ADDFB2 IOCTL calls into this callback.
266 : *
267 : * Returns:
268 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
269 : */
270 : struct drm_framebuffer *
271 0 : drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
272 : const struct drm_mode_fb_cmd2 *mode_cmd)
273 : {
274 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
275 : &drm_gem_fb_funcs);
276 : }
277 : EXPORT_SYMBOL_GPL(drm_gem_fb_create);
278 :
279 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
280 : .destroy = drm_gem_fb_destroy,
281 : .create_handle = drm_gem_fb_create_handle,
282 : .dirty = drm_atomic_helper_dirtyfb,
283 : };
284 :
285 : /**
286 : * drm_gem_fb_create_with_dirty() - Helper function for the
287 : * &drm_mode_config_funcs.fb_create callback
288 : * @dev: DRM device
289 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
290 : * @mode_cmd: Metadata from the userspace framebuffer creation request
291 : *
292 : * This function creates a new framebuffer object described by
293 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
294 : * backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
295 : * callback giving framebuffer flushing through the atomic machinery. Use
296 : * drm_gem_fb_create() if you don't need the dirty callback.
297 : * The function does buffer size validation.
298 : *
299 : * Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
300 : * to enable userspace to use damage clips also with the ATOMIC IOCTL.
301 : *
302 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
303 : * The ADDFB2 IOCTL calls into this callback.
304 : *
305 : * Returns:
306 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
307 : */
308 : struct drm_framebuffer *
309 0 : drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
310 : const struct drm_mode_fb_cmd2 *mode_cmd)
311 : {
312 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
313 : &drm_gem_fb_funcs_dirtyfb);
314 : }
315 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
316 :
317 : /**
318 : * drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
319 : * @fb: the framebuffer
320 : * @map: returns the mapping's address for each BO
321 : * @data: returns the data address for each BO, can be NULL
322 : *
323 : * This function maps all buffer objects of the given framebuffer into
324 : * kernel address space and stores them in struct iosys_map. If the
325 : * mapping operation fails for one of the BOs, the function unmaps the
326 : * already established mappings automatically.
327 : *
328 : * Callers that want to access a BO's stored data should pass @data.
329 : * The argument returns the addresses of the data stored in each BO. This
330 : * is different from @map if the framebuffer's offsets field is non-zero.
331 : *
332 : * See drm_gem_fb_vunmap() for unmapping.
333 : *
334 : * Returns:
335 : * 0 on success, or a negative errno code otherwise.
336 : */
337 0 : int drm_gem_fb_vmap(struct drm_framebuffer *fb,
338 : struct iosys_map map[static DRM_FORMAT_MAX_PLANES],
339 : struct iosys_map data[DRM_FORMAT_MAX_PLANES])
340 : {
341 : struct drm_gem_object *obj;
342 : unsigned int i;
343 : int ret;
344 :
345 0 : for (i = 0; i < DRM_FORMAT_MAX_PLANES; ++i) {
346 0 : obj = drm_gem_fb_get_obj(fb, i);
347 0 : if (!obj) {
348 0 : iosys_map_clear(&map[i]);
349 0 : continue;
350 : }
351 0 : ret = drm_gem_vmap(obj, &map[i]);
352 0 : if (ret)
353 : goto err_drm_gem_vunmap;
354 : }
355 :
356 0 : if (data) {
357 0 : for (i = 0; i < DRM_FORMAT_MAX_PLANES; ++i) {
358 0 : memcpy(&data[i], &map[i], sizeof(data[i]));
359 0 : if (iosys_map_is_null(&data[i]))
360 0 : continue;
361 0 : iosys_map_incr(&data[i], fb->offsets[i]);
362 : }
363 : }
364 :
365 : return 0;
366 :
367 : err_drm_gem_vunmap:
368 0 : while (i) {
369 0 : --i;
370 0 : obj = drm_gem_fb_get_obj(fb, i);
371 0 : if (!obj)
372 0 : continue;
373 0 : drm_gem_vunmap(obj, &map[i]);
374 : }
375 : return ret;
376 : }
377 : EXPORT_SYMBOL(drm_gem_fb_vmap);
378 :
379 : /**
380 : * drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
381 : * @fb: the framebuffer
382 : * @map: mapping addresses as returned by drm_gem_fb_vmap()
383 : *
384 : * This function unmaps all buffer objects of the given framebuffer.
385 : *
386 : * See drm_gem_fb_vmap() for more information.
387 : */
388 0 : void drm_gem_fb_vunmap(struct drm_framebuffer *fb,
389 : struct iosys_map map[static DRM_FORMAT_MAX_PLANES])
390 : {
391 0 : unsigned int i = DRM_FORMAT_MAX_PLANES;
392 : struct drm_gem_object *obj;
393 :
394 0 : while (i) {
395 0 : --i;
396 0 : obj = drm_gem_fb_get_obj(fb, i);
397 0 : if (!obj)
398 0 : continue;
399 0 : if (iosys_map_is_null(&map[i]))
400 0 : continue;
401 0 : drm_gem_vunmap(obj, &map[i]);
402 : }
403 0 : }
404 : EXPORT_SYMBOL(drm_gem_fb_vunmap);
405 :
406 : /**
407 : * drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
408 : * @fb: the framebuffer
409 : * @dir: access mode
410 : *
411 : * Prepares a framebuffer's GEM buffer objects for CPU access. This function
412 : * must be called before accessing the BO data within the kernel. For imported
413 : * BOs, the function calls dma_buf_begin_cpu_access().
414 : *
415 : * See drm_gem_fb_end_cpu_access() for signalling the end of CPU access.
416 : *
417 : * Returns:
418 : * 0 on success, or a negative errno code otherwise.
419 : */
420 0 : int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
421 : {
422 : struct dma_buf_attachment *import_attach;
423 : struct drm_gem_object *obj;
424 : size_t i;
425 : int ret, ret2;
426 :
427 0 : for (i = 0; i < ARRAY_SIZE(fb->obj); ++i) {
428 0 : obj = drm_gem_fb_get_obj(fb, i);
429 0 : if (!obj)
430 0 : continue;
431 0 : import_attach = obj->import_attach;
432 0 : if (!import_attach)
433 0 : continue;
434 0 : ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir);
435 0 : if (ret)
436 : goto err_dma_buf_end_cpu_access;
437 : }
438 :
439 : return 0;
440 :
441 : err_dma_buf_end_cpu_access:
442 0 : while (i) {
443 0 : --i;
444 0 : obj = drm_gem_fb_get_obj(fb, i);
445 0 : if (!obj)
446 0 : continue;
447 0 : import_attach = obj->import_attach;
448 0 : if (!import_attach)
449 0 : continue;
450 0 : ret2 = dma_buf_end_cpu_access(import_attach->dmabuf, dir);
451 0 : if (ret2) {
452 0 : drm_err(fb->dev,
453 : "dma_buf_end_cpu_access() failed during error handling: %d\n",
454 : ret2);
455 : }
456 : }
457 :
458 : return ret;
459 : }
460 : EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access);
461 :
462 : /**
463 : * drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects
464 : * @fb: the framebuffer
465 : * @dir: access mode
466 : *
467 : * Signals the end of CPU access to the given framebuffer's GEM buffer objects. This
468 : * function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access().
469 : * For imported BOs, the function calls dma_buf_end_cpu_access().
470 : *
471 : * See also drm_gem_fb_begin_cpu_access().
472 : */
473 0 : void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
474 : {
475 0 : size_t i = ARRAY_SIZE(fb->obj);
476 : struct dma_buf_attachment *import_attach;
477 : struct drm_gem_object *obj;
478 : int ret;
479 :
480 0 : while (i) {
481 0 : --i;
482 0 : obj = drm_gem_fb_get_obj(fb, i);
483 0 : if (!obj)
484 0 : continue;
485 0 : import_attach = obj->import_attach;
486 0 : if (!import_attach)
487 0 : continue;
488 0 : ret = dma_buf_end_cpu_access(import_attach->dmabuf, dir);
489 0 : if (ret)
490 0 : drm_err(fb->dev, "dma_buf_end_cpu_access() failed: %d\n", ret);
491 : }
492 0 : }
493 : EXPORT_SYMBOL(drm_gem_fb_end_cpu_access);
494 :
495 0 : static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev,
496 : const struct drm_mode_fb_cmd2 *mode_cmd)
497 : {
498 : const struct drm_format_info *info;
499 :
500 0 : info = drm_get_format_info(dev, mode_cmd);
501 :
502 : /* use whatever a driver has set */
503 0 : if (info->cpp[0])
504 0 : return info->cpp[0] * 8;
505 :
506 : /* guess otherwise */
507 0 : switch (info->format) {
508 : case DRM_FORMAT_YUV420_8BIT:
509 : return 12;
510 : case DRM_FORMAT_YUV420_10BIT:
511 0 : return 15;
512 : case DRM_FORMAT_VUY101010:
513 0 : return 30;
514 : default:
515 : break;
516 : }
517 :
518 : /* all attempts failed */
519 0 : return 0;
520 : }
521 :
522 0 : static int drm_gem_afbc_min_size(struct drm_device *dev,
523 : const struct drm_mode_fb_cmd2 *mode_cmd,
524 : struct drm_afbc_framebuffer *afbc_fb)
525 : {
526 : __u32 n_blocks, w_alignment, h_alignment, hdr_alignment;
527 : /* remove bpp when all users properly encode cpp in drm_format_info */
528 : __u32 bpp;
529 :
530 0 : switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
531 : case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
532 0 : afbc_fb->block_width = 16;
533 0 : afbc_fb->block_height = 16;
534 0 : break;
535 : case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
536 0 : afbc_fb->block_width = 32;
537 0 : afbc_fb->block_height = 8;
538 0 : break;
539 : /* no user exists yet - fall through */
540 : case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4:
541 : case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4:
542 : default:
543 0 : drm_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
544 : mode_cmd->modifier[0]
545 : & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
546 0 : return -EINVAL;
547 : }
548 :
549 : /* tiled header afbc */
550 0 : w_alignment = afbc_fb->block_width;
551 0 : h_alignment = afbc_fb->block_height;
552 0 : hdr_alignment = AFBC_HDR_ALIGN;
553 0 : if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) {
554 0 : w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
555 0 : h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
556 0 : hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT;
557 : }
558 :
559 0 : afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment);
560 0 : afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment);
561 0 : afbc_fb->offset = mode_cmd->offsets[0];
562 :
563 0 : bpp = drm_gem_afbc_get_bpp(dev, mode_cmd);
564 0 : if (!bpp) {
565 0 : drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp);
566 0 : return -EINVAL;
567 : }
568 :
569 0 : n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height)
570 : / AFBC_SUPERBLOCK_PIXELS;
571 0 : afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment);
572 0 : afbc_fb->afbc_size += n_blocks * ALIGN(bpp * AFBC_SUPERBLOCK_PIXELS / 8,
573 : AFBC_SUPERBLOCK_ALIGNMENT);
574 :
575 0 : return 0;
576 : }
577 :
578 : /**
579 : * drm_gem_fb_afbc_init() - Helper function for drivers using afbc to
580 : * fill and validate all the afbc-specific
581 : * struct drm_afbc_framebuffer members
582 : *
583 : * @dev: DRM device
584 : * @afbc_fb: afbc-specific framebuffer
585 : * @mode_cmd: Metadata from the userspace framebuffer creation request
586 : * @afbc_fb: afbc framebuffer
587 : *
588 : * This function can be used by drivers which support afbc to complete
589 : * the preparation of struct drm_afbc_framebuffer. It must be called after
590 : * allocating the said struct and calling drm_gem_fb_init_with_funcs().
591 : * It is caller's responsibility to put afbc_fb->base.obj objects in case
592 : * the call is unsuccessful.
593 : *
594 : * Returns:
595 : * Zero on success or a negative error value on failure.
596 : */
597 0 : int drm_gem_fb_afbc_init(struct drm_device *dev,
598 : const struct drm_mode_fb_cmd2 *mode_cmd,
599 : struct drm_afbc_framebuffer *afbc_fb)
600 : {
601 : const struct drm_format_info *info;
602 : struct drm_gem_object **objs;
603 : int ret;
604 :
605 0 : objs = afbc_fb->base.obj;
606 0 : info = drm_get_format_info(dev, mode_cmd);
607 0 : if (!info)
608 : return -EINVAL;
609 :
610 0 : ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb);
611 0 : if (ret < 0)
612 : return ret;
613 :
614 0 : if (objs[0]->size < afbc_fb->afbc_size)
615 : return -EINVAL;
616 :
617 0 : return 0;
618 : }
619 : EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init);
|
