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_drv.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 : struct drm_device *dev = fb->dev;
57 :
58 0 : if (drm_WARN_ON_ONCE(dev, plane >= ARRAY_SIZE(fb->obj)))
59 : return NULL;
60 0 : else if (drm_WARN_ON_ONCE(dev, !fb->obj[plane]))
61 : return NULL;
62 :
63 0 : return fb->obj[plane];
64 : }
65 : EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
66 :
67 : static int
68 0 : drm_gem_fb_init(struct drm_device *dev,
69 : struct drm_framebuffer *fb,
70 : const struct drm_mode_fb_cmd2 *mode_cmd,
71 : struct drm_gem_object **obj, unsigned int num_planes,
72 : const struct drm_framebuffer_funcs *funcs)
73 : {
74 : unsigned int i;
75 : int ret;
76 :
77 0 : drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
78 :
79 0 : for (i = 0; i < num_planes; i++)
80 0 : fb->obj[i] = obj[i];
81 :
82 0 : ret = drm_framebuffer_init(dev, fb, funcs);
83 0 : if (ret)
84 0 : drm_err(dev, "Failed to init framebuffer: %d\n", ret);
85 :
86 0 : return ret;
87 : }
88 :
89 : /**
90 : * drm_gem_fb_destroy - Free GEM backed framebuffer
91 : * @fb: Framebuffer
92 : *
93 : * Frees a GEM backed framebuffer with its backing buffer(s) and the structure
94 : * itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
95 : * callback.
96 : */
97 0 : void drm_gem_fb_destroy(struct drm_framebuffer *fb)
98 : {
99 : unsigned int i;
100 :
101 0 : for (i = 0; i < fb->format->num_planes; i++)
102 0 : drm_gem_object_put(fb->obj[i]);
103 :
104 0 : drm_framebuffer_cleanup(fb);
105 0 : kfree(fb);
106 0 : }
107 : EXPORT_SYMBOL(drm_gem_fb_destroy);
108 :
109 : /**
110 : * drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
111 : * @fb: Framebuffer
112 : * @file: DRM file to register the handle for
113 : * @handle: Pointer to return the created handle
114 : *
115 : * This function creates a handle for the GEM object backing the framebuffer.
116 : * Drivers can use this as their &drm_framebuffer_funcs->create_handle
117 : * callback. The GETFB IOCTL calls into this callback.
118 : *
119 : * Returns:
120 : * 0 on success or a negative error code on failure.
121 : */
122 0 : int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
123 : unsigned int *handle)
124 : {
125 0 : return drm_gem_handle_create(file, fb->obj[0], handle);
126 : }
127 : EXPORT_SYMBOL(drm_gem_fb_create_handle);
128 :
129 : /**
130 : * drm_gem_fb_init_with_funcs() - Helper function for implementing
131 : * &drm_mode_config_funcs.fb_create
132 : * callback in cases when the driver
133 : * allocates a subclass of
134 : * struct drm_framebuffer
135 : * @dev: DRM device
136 : * @fb: framebuffer object
137 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
138 : * @mode_cmd: Metadata from the userspace framebuffer creation request
139 : * @funcs: vtable to be used for the new framebuffer object
140 : *
141 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
142 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
143 : * change &drm_framebuffer_funcs. The function does buffer size validation.
144 : * The buffer size validation is for a general case, though, so users should
145 : * pay attention to the checks being appropriate for them or, at least,
146 : * non-conflicting.
147 : *
148 : * Returns:
149 : * Zero or a negative error code.
150 : */
151 0 : int drm_gem_fb_init_with_funcs(struct drm_device *dev,
152 : struct drm_framebuffer *fb,
153 : struct drm_file *file,
154 : const struct drm_mode_fb_cmd2 *mode_cmd,
155 : const struct drm_framebuffer_funcs *funcs)
156 : {
157 : const struct drm_format_info *info;
158 : struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
159 : unsigned int i;
160 : int ret;
161 :
162 0 : info = drm_get_format_info(dev, mode_cmd);
163 0 : if (!info) {
164 0 : drm_dbg_kms(dev, "Failed to get FB format info\n");
165 0 : return -EINVAL;
166 : }
167 :
168 0 : if (drm_drv_uses_atomic_modeset(dev) &&
169 0 : !drm_any_plane_has_format(dev, mode_cmd->pixel_format,
170 : mode_cmd->modifier[0])) {
171 0 : drm_dbg(dev, "Unsupported pixel format %p4cc / modifier 0x%llx\n",
172 : &mode_cmd->pixel_format, mode_cmd->modifier[0]);
173 0 : return -EINVAL;
174 : }
175 :
176 0 : for (i = 0; i < info->num_planes; i++) {
177 0 : unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
178 0 : unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
179 : unsigned int min_size;
180 :
181 0 : objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
182 0 : if (!objs[i]) {
183 0 : drm_dbg_kms(dev, "Failed to lookup GEM object\n");
184 0 : ret = -ENOENT;
185 0 : goto err_gem_object_put;
186 : }
187 :
188 0 : min_size = (height - 1) * mode_cmd->pitches[i]
189 0 : + drm_format_info_min_pitch(info, i, width)
190 0 : + mode_cmd->offsets[i];
191 :
192 0 : if (objs[i]->size < min_size) {
193 0 : drm_dbg_kms(dev,
194 : "GEM object size (%zu) smaller than minimum size (%u) for plane %d\n",
195 : objs[i]->size, min_size, i);
196 0 : drm_gem_object_put(objs[i]);
197 : ret = -EINVAL;
198 : goto err_gem_object_put;
199 : }
200 : }
201 :
202 0 : ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs);
203 0 : if (ret)
204 : goto err_gem_object_put;
205 :
206 : return 0;
207 :
208 : err_gem_object_put:
209 0 : while (i > 0) {
210 0 : --i;
211 0 : drm_gem_object_put(objs[i]);
212 : }
213 : return ret;
214 : }
215 : EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
216 :
217 : /**
218 : * drm_gem_fb_create_with_funcs() - Helper function for the
219 : * &drm_mode_config_funcs.fb_create
220 : * callback
221 : * @dev: DRM device
222 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
223 : * @mode_cmd: Metadata from the userspace framebuffer creation request
224 : * @funcs: vtable to be used for the new framebuffer object
225 : *
226 : * This function can be used to set &drm_framebuffer_funcs for drivers that need
227 : * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
228 : * change &drm_framebuffer_funcs. The function does buffer size validation.
229 : *
230 : * Returns:
231 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
232 : */
233 : struct drm_framebuffer *
234 0 : drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
235 : const struct drm_mode_fb_cmd2 *mode_cmd,
236 : const struct drm_framebuffer_funcs *funcs)
237 : {
238 : struct drm_framebuffer *fb;
239 : int ret;
240 :
241 0 : fb = kzalloc(sizeof(*fb), GFP_KERNEL);
242 0 : if (!fb)
243 : return ERR_PTR(-ENOMEM);
244 :
245 0 : ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs);
246 0 : if (ret) {
247 0 : kfree(fb);
248 0 : return ERR_PTR(ret);
249 : }
250 :
251 : return fb;
252 : }
253 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
254 :
255 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
256 : .destroy = drm_gem_fb_destroy,
257 : .create_handle = drm_gem_fb_create_handle,
258 : };
259 :
260 : /**
261 : * drm_gem_fb_create() - Helper function for the
262 : * &drm_mode_config_funcs.fb_create callback
263 : * @dev: DRM device
264 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
265 : * @mode_cmd: Metadata from the userspace framebuffer creation request
266 : *
267 : * This function creates a new framebuffer object described by
268 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
269 : * backing the framebuffer.
270 : *
271 : * If your hardware has special alignment or pitch requirements these should be
272 : * checked before calling this function. The function does buffer size
273 : * validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
274 : * flushing.
275 : *
276 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
277 : * The ADDFB2 IOCTL calls into this callback.
278 : *
279 : * Returns:
280 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
281 : */
282 : struct drm_framebuffer *
283 0 : drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
284 : const struct drm_mode_fb_cmd2 *mode_cmd)
285 : {
286 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
287 : &drm_gem_fb_funcs);
288 : }
289 : EXPORT_SYMBOL_GPL(drm_gem_fb_create);
290 :
291 : static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
292 : .destroy = drm_gem_fb_destroy,
293 : .create_handle = drm_gem_fb_create_handle,
294 : .dirty = drm_atomic_helper_dirtyfb,
295 : };
296 :
297 : /**
298 : * drm_gem_fb_create_with_dirty() - Helper function for the
299 : * &drm_mode_config_funcs.fb_create callback
300 : * @dev: DRM device
301 : * @file: DRM file that holds the GEM handle(s) backing the framebuffer
302 : * @mode_cmd: Metadata from the userspace framebuffer creation request
303 : *
304 : * This function creates a new framebuffer object described by
305 : * &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
306 : * backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
307 : * callback giving framebuffer flushing through the atomic machinery. Use
308 : * drm_gem_fb_create() if you don't need the dirty callback.
309 : * The function does buffer size validation.
310 : *
311 : * Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
312 : * to enable userspace to use damage clips also with the ATOMIC IOCTL.
313 : *
314 : * Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
315 : * The ADDFB2 IOCTL calls into this callback.
316 : *
317 : * Returns:
318 : * Pointer to a &drm_framebuffer on success or an error pointer on failure.
319 : */
320 : struct drm_framebuffer *
321 0 : drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
322 : const struct drm_mode_fb_cmd2 *mode_cmd)
323 : {
324 0 : return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
325 : &drm_gem_fb_funcs_dirtyfb);
326 : }
327 : EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
328 :
329 : /**
330 : * drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
331 : * @fb: the framebuffer
332 : * @map: returns the mapping's address for each BO
333 : * @data: returns the data address for each BO, can be NULL
334 : *
335 : * This function maps all buffer objects of the given framebuffer into
336 : * kernel address space and stores them in struct iosys_map. If the
337 : * mapping operation fails for one of the BOs, the function unmaps the
338 : * already established mappings automatically.
339 : *
340 : * Callers that want to access a BO's stored data should pass @data.
341 : * The argument returns the addresses of the data stored in each BO. This
342 : * is different from @map if the framebuffer's offsets field is non-zero.
343 : *
344 : * Both, @map and @data, must each refer to arrays with at least
345 : * fb->format->num_planes elements.
346 : *
347 : * See drm_gem_fb_vunmap() for unmapping.
348 : *
349 : * Returns:
350 : * 0 on success, or a negative errno code otherwise.
351 : */
352 0 : int drm_gem_fb_vmap(struct drm_framebuffer *fb, struct iosys_map *map,
353 : struct iosys_map *data)
354 : {
355 : struct drm_gem_object *obj;
356 : unsigned int i;
357 : int ret;
358 :
359 0 : for (i = 0; i < fb->format->num_planes; ++i) {
360 0 : obj = drm_gem_fb_get_obj(fb, i);
361 0 : if (!obj) {
362 : ret = -EINVAL;
363 : goto err_drm_gem_vunmap;
364 : }
365 0 : ret = drm_gem_vmap_unlocked(obj, &map[i]);
366 0 : if (ret)
367 : goto err_drm_gem_vunmap;
368 : }
369 :
370 0 : if (data) {
371 0 : for (i = 0; i < fb->format->num_planes; ++i) {
372 0 : memcpy(&data[i], &map[i], sizeof(data[i]));
373 0 : if (iosys_map_is_null(&data[i]))
374 0 : continue;
375 0 : iosys_map_incr(&data[i], fb->offsets[i]);
376 : }
377 : }
378 :
379 : return 0;
380 :
381 : err_drm_gem_vunmap:
382 0 : while (i) {
383 0 : --i;
384 0 : obj = drm_gem_fb_get_obj(fb, i);
385 0 : if (!obj)
386 0 : continue;
387 0 : drm_gem_vunmap_unlocked(obj, &map[i]);
388 : }
389 : return ret;
390 : }
391 : EXPORT_SYMBOL(drm_gem_fb_vmap);
392 :
393 : /**
394 : * drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
395 : * @fb: the framebuffer
396 : * @map: mapping addresses as returned by drm_gem_fb_vmap()
397 : *
398 : * This function unmaps all buffer objects of the given framebuffer.
399 : *
400 : * See drm_gem_fb_vmap() for more information.
401 : */
402 0 : void drm_gem_fb_vunmap(struct drm_framebuffer *fb, struct iosys_map *map)
403 : {
404 0 : unsigned int i = fb->format->num_planes;
405 : struct drm_gem_object *obj;
406 :
407 0 : while (i) {
408 0 : --i;
409 0 : obj = drm_gem_fb_get_obj(fb, i);
410 0 : if (!obj)
411 0 : continue;
412 0 : if (iosys_map_is_null(&map[i]))
413 0 : continue;
414 0 : drm_gem_vunmap_unlocked(obj, &map[i]);
415 : }
416 0 : }
417 : EXPORT_SYMBOL(drm_gem_fb_vunmap);
418 :
419 0 : static void __drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir,
420 : unsigned int num_planes)
421 : {
422 : struct dma_buf_attachment *import_attach;
423 : struct drm_gem_object *obj;
424 : int ret;
425 :
426 0 : while (num_planes) {
427 0 : --num_planes;
428 0 : obj = drm_gem_fb_get_obj(fb, num_planes);
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_end_cpu_access(import_attach->dmabuf, dir);
435 0 : if (ret)
436 0 : drm_err(fb->dev, "dma_buf_end_cpu_access(%u, %d) failed: %d\n",
437 : ret, num_planes, dir);
438 : }
439 0 : }
440 :
441 : /**
442 : * drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
443 : * @fb: the framebuffer
444 : * @dir: access mode
445 : *
446 : * Prepares a framebuffer's GEM buffer objects for CPU access. This function
447 : * must be called before accessing the BO data within the kernel. For imported
448 : * BOs, the function calls dma_buf_begin_cpu_access().
449 : *
450 : * See drm_gem_fb_end_cpu_access() for signalling the end of CPU access.
451 : *
452 : * Returns:
453 : * 0 on success, or a negative errno code otherwise.
454 : */
455 0 : int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
456 : {
457 : struct dma_buf_attachment *import_attach;
458 : struct drm_gem_object *obj;
459 : unsigned int i;
460 : int ret;
461 :
462 0 : for (i = 0; i < fb->format->num_planes; ++i) {
463 0 : obj = drm_gem_fb_get_obj(fb, i);
464 0 : if (!obj) {
465 : ret = -EINVAL;
466 : goto err___drm_gem_fb_end_cpu_access;
467 : }
468 0 : import_attach = obj->import_attach;
469 0 : if (!import_attach)
470 0 : continue;
471 0 : ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir);
472 0 : if (ret)
473 : goto err___drm_gem_fb_end_cpu_access;
474 : }
475 :
476 : return 0;
477 :
478 : err___drm_gem_fb_end_cpu_access:
479 0 : __drm_gem_fb_end_cpu_access(fb, dir, i);
480 0 : return ret;
481 : }
482 : EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access);
483 :
484 : /**
485 : * drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects
486 : * @fb: the framebuffer
487 : * @dir: access mode
488 : *
489 : * Signals the end of CPU access to the given framebuffer's GEM buffer objects. This
490 : * function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access().
491 : * For imported BOs, the function calls dma_buf_end_cpu_access().
492 : *
493 : * See also drm_gem_fb_begin_cpu_access().
494 : */
495 0 : void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
496 : {
497 0 : __drm_gem_fb_end_cpu_access(fb, dir, fb->format->num_planes);
498 0 : }
499 : EXPORT_SYMBOL(drm_gem_fb_end_cpu_access);
500 :
501 : // TODO Drop this function and replace by drm_format_info_bpp() once all
502 : // DRM_FORMAT_* provide proper block info in drivers/gpu/drm/drm_fourcc.c
503 0 : static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev,
504 : const struct drm_mode_fb_cmd2 *mode_cmd)
505 : {
506 : const struct drm_format_info *info;
507 :
508 0 : info = drm_get_format_info(dev, mode_cmd);
509 :
510 0 : switch (info->format) {
511 : case DRM_FORMAT_YUV420_8BIT:
512 : return 12;
513 : case DRM_FORMAT_YUV420_10BIT:
514 0 : return 15;
515 : case DRM_FORMAT_VUY101010:
516 0 : return 30;
517 : default:
518 0 : return drm_format_info_bpp(info, 0);
519 : }
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);
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