Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4c3dbb2c NT |
2 | /* |
3 | * drm gem framebuffer helper functions | |
4 | * | |
5 | * Copyright (C) 2017 Noralf Trønnes | |
4c3dbb2c NT |
6 | */ |
7 | ||
4c3dbb2c NT |
8 | #include <linux/slab.h> |
9 | ||
dbd62e16 | 10 | #include <drm/drm_damage_helper.h> |
4c3dbb2c NT |
11 | #include <drm/drm_fb_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 | ||
55f7f727 AP |
18 | #define AFBC_HEADER_SIZE 16 |
19 | #define AFBC_TH_LAYOUT_ALIGNMENT 8 | |
20 | #define AFBC_HDR_ALIGN 64 | |
21 | #define AFBC_SUPERBLOCK_PIXELS 256 | |
22 | #define AFBC_SUPERBLOCK_ALIGNMENT 128 | |
23 | #define AFBC_TH_BODY_START_ALIGNMENT 4096 | |
24 | ||
4c3dbb2c NT |
25 | /** |
26 | * DOC: overview | |
27 | * | |
28 | * This library provides helpers for drivers that don't subclass | |
2e187b20 | 29 | * &drm_framebuffer and use &drm_gem_object for their backing storage. |
4c3dbb2c NT |
30 | * |
31 | * Drivers without additional needs to validate framebuffers can simply use | |
2e187b20 NT |
32 | * drm_gem_fb_create() and everything is wired up automatically. Other drivers |
33 | * can use all parts independently. | |
4c3dbb2c NT |
34 | */ |
35 | ||
36 | /** | |
2e187b20 NT |
37 | * drm_gem_fb_get_obj() - Get GEM object backing the framebuffer |
38 | * @fb: Framebuffer | |
39 | * @plane: Plane index | |
4c3dbb2c | 40 | * |
2e187b20 NT |
41 | * No additional reference is taken beyond the one that the &drm_frambuffer |
42 | * already holds. | |
43 | * | |
44 | * Returns: | |
45 | * Pointer to &drm_gem_object for the given framebuffer and plane index or NULL | |
46 | * if it does not exist. | |
4c3dbb2c NT |
47 | */ |
48 | struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb, | |
49 | unsigned int plane) | |
50 | { | |
279cc2e9 | 51 | if (plane >= ARRAY_SIZE(fb->obj)) |
4c3dbb2c NT |
52 | return NULL; |
53 | ||
54 | return fb->obj[plane]; | |
55 | } | |
56 | EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj); | |
57 | ||
f2b816d7 AP |
58 | static int |
59 | drm_gem_fb_init(struct drm_device *dev, | |
60 | struct drm_framebuffer *fb, | |
4c3dbb2c NT |
61 | const struct drm_mode_fb_cmd2 *mode_cmd, |
62 | struct drm_gem_object **obj, unsigned int num_planes, | |
63 | const struct drm_framebuffer_funcs *funcs) | |
64 | { | |
279cc2e9 TZ |
65 | unsigned int i; |
66 | int ret; | |
4c3dbb2c | 67 | |
4c3dbb2c NT |
68 | drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); |
69 | ||
70 | for (i = 0; i < num_planes; i++) | |
71 | fb->obj[i] = obj[i]; | |
72 | ||
73 | ret = drm_framebuffer_init(dev, fb, funcs); | |
13e3d941 | 74 | if (ret) |
24f03be4 | 75 | drm_err(dev, "Failed to init framebuffer: %d\n", ret); |
4c3dbb2c | 76 | |
f2b816d7 | 77 | return ret; |
4c3dbb2c NT |
78 | } |
79 | ||
80 | /** | |
81 | * drm_gem_fb_destroy - Free GEM backed framebuffer | |
2e187b20 | 82 | * @fb: Framebuffer |
4c3dbb2c NT |
83 | * |
84 | * Frees a GEM backed framebuffer with its backing buffer(s) and the structure | |
85 | * itself. Drivers can use this as their &drm_framebuffer_funcs->destroy | |
86 | * callback. | |
87 | */ | |
88 | void drm_gem_fb_destroy(struct drm_framebuffer *fb) | |
89 | { | |
279cc2e9 | 90 | size_t i; |
4c3dbb2c | 91 | |
279cc2e9 | 92 | for (i = 0; i < ARRAY_SIZE(fb->obj); i++) |
be6ee102 | 93 | drm_gem_object_put(fb->obj[i]); |
4c3dbb2c NT |
94 | |
95 | drm_framebuffer_cleanup(fb); | |
96 | kfree(fb); | |
97 | } | |
98 | EXPORT_SYMBOL(drm_gem_fb_destroy); | |
99 | ||
100 | /** | |
101 | * drm_gem_fb_create_handle - Create handle for GEM backed framebuffer | |
2e187b20 NT |
102 | * @fb: Framebuffer |
103 | * @file: DRM file to register the handle for | |
104 | * @handle: Pointer to return the created handle | |
4c3dbb2c | 105 | * |
2e187b20 | 106 | * This function creates a handle for the GEM object backing the framebuffer. |
4c3dbb2c | 107 | * Drivers can use this as their &drm_framebuffer_funcs->create_handle |
2e187b20 | 108 | * callback. The GETFB IOCTL calls into this callback. |
4c3dbb2c NT |
109 | * |
110 | * Returns: | |
111 | * 0 on success or a negative error code on failure. | |
112 | */ | |
113 | int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file, | |
114 | unsigned int *handle) | |
115 | { | |
116 | return drm_gem_handle_create(file, fb->obj[0], handle); | |
117 | } | |
118 | EXPORT_SYMBOL(drm_gem_fb_create_handle); | |
119 | ||
120 | /** | |
f2b816d7 AP |
121 | * drm_gem_fb_init_with_funcs() - Helper function for implementing |
122 | * &drm_mode_config_funcs.fb_create | |
123 | * callback in cases when the driver | |
124 | * allocates a subclass of | |
125 | * struct drm_framebuffer | |
4c3dbb2c | 126 | * @dev: DRM device |
f2b816d7 | 127 | * @fb: framebuffer object |
2e187b20 NT |
128 | * @file: DRM file that holds the GEM handle(s) backing the framebuffer |
129 | * @mode_cmd: Metadata from the userspace framebuffer creation request | |
4c3dbb2c NT |
130 | * @funcs: vtable to be used for the new framebuffer object |
131 | * | |
dbd62e16 NT |
132 | * This function can be used to set &drm_framebuffer_funcs for drivers that need |
133 | * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to | |
134 | * change &drm_framebuffer_funcs. The function does buffer size validation. | |
f2b816d7 AP |
135 | * The buffer size validation is for a general case, though, so users should |
136 | * pay attention to the checks being appropriate for them or, at least, | |
137 | * non-conflicting. | |
2e187b20 NT |
138 | * |
139 | * Returns: | |
f2b816d7 | 140 | * Zero or a negative error code. |
4c3dbb2c | 141 | */ |
f2b816d7 AP |
142 | int drm_gem_fb_init_with_funcs(struct drm_device *dev, |
143 | struct drm_framebuffer *fb, | |
144 | struct drm_file *file, | |
145 | const struct drm_mode_fb_cmd2 *mode_cmd, | |
146 | const struct drm_framebuffer_funcs *funcs) | |
4c3dbb2c NT |
147 | { |
148 | const struct drm_format_info *info; | |
279cc2e9 TZ |
149 | struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES]; |
150 | unsigned int i; | |
151 | int ret; | |
4c3dbb2c NT |
152 | |
153 | info = drm_get_format_info(dev, mode_cmd); | |
f7f52503 SS |
154 | if (!info) { |
155 | drm_dbg_kms(dev, "Failed to get FB format info\n"); | |
f2b816d7 | 156 | return -EINVAL; |
f7f52503 | 157 | } |
4c3dbb2c NT |
158 | |
159 | for (i = 0; i < info->num_planes; i++) { | |
160 | unsigned int width = mode_cmd->width / (i ? info->hsub : 1); | |
161 | unsigned int height = mode_cmd->height / (i ? info->vsub : 1); | |
162 | unsigned int min_size; | |
163 | ||
164 | objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]); | |
165 | if (!objs[i]) { | |
24f03be4 | 166 | drm_dbg_kms(dev, "Failed to lookup GEM object\n"); |
4c3dbb2c NT |
167 | ret = -ENOENT; |
168 | goto err_gem_object_put; | |
169 | } | |
170 | ||
171 | min_size = (height - 1) * mode_cmd->pitches[i] | |
042bf753 | 172 | + drm_format_info_min_pitch(info, i, width) |
4c3dbb2c NT |
173 | + mode_cmd->offsets[i]; |
174 | ||
175 | if (objs[i]->size < min_size) { | |
f7f52503 SS |
176 | drm_dbg_kms(dev, |
177 | "GEM object size (%zu) smaller than minimum size (%u) for plane %d\n", | |
178 | objs[i]->size, min_size, i); | |
be6ee102 | 179 | drm_gem_object_put(objs[i]); |
4c3dbb2c NT |
180 | ret = -EINVAL; |
181 | goto err_gem_object_put; | |
182 | } | |
183 | } | |
184 | ||
f2b816d7 AP |
185 | ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs); |
186 | if (ret) | |
4c3dbb2c | 187 | goto err_gem_object_put; |
4c3dbb2c | 188 | |
f2b816d7 | 189 | return 0; |
4c3dbb2c NT |
190 | |
191 | err_gem_object_put: | |
279cc2e9 TZ |
192 | while (i > 0) { |
193 | --i; | |
be6ee102 | 194 | drm_gem_object_put(objs[i]); |
279cc2e9 | 195 | } |
f2b816d7 AP |
196 | return ret; |
197 | } | |
198 | EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs); | |
199 | ||
200 | /** | |
201 | * drm_gem_fb_create_with_funcs() - Helper function for the | |
202 | * &drm_mode_config_funcs.fb_create | |
203 | * callback | |
204 | * @dev: DRM device | |
205 | * @file: DRM file that holds the GEM handle(s) backing the framebuffer | |
206 | * @mode_cmd: Metadata from the userspace framebuffer creation request | |
207 | * @funcs: vtable to be used for the new framebuffer object | |
208 | * | |
209 | * This function can be used to set &drm_framebuffer_funcs for drivers that need | |
210 | * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to | |
211 | * change &drm_framebuffer_funcs. The function does buffer size validation. | |
212 | * | |
213 | * Returns: | |
214 | * Pointer to a &drm_framebuffer on success or an error pointer on failure. | |
215 | */ | |
216 | struct drm_framebuffer * | |
217 | drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file, | |
218 | const struct drm_mode_fb_cmd2 *mode_cmd, | |
219 | const struct drm_framebuffer_funcs *funcs) | |
220 | { | |
221 | struct drm_framebuffer *fb; | |
222 | int ret; | |
223 | ||
224 | fb = kzalloc(sizeof(*fb), GFP_KERNEL); | |
225 | if (!fb) | |
226 | return ERR_PTR(-ENOMEM); | |
227 | ||
228 | ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs); | |
229 | if (ret) { | |
230 | kfree(fb); | |
231 | return ERR_PTR(ret); | |
232 | } | |
233 | ||
234 | return fb; | |
4c3dbb2c NT |
235 | } |
236 | EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs); | |
237 | ||
238 | static const struct drm_framebuffer_funcs drm_gem_fb_funcs = { | |
239 | .destroy = drm_gem_fb_destroy, | |
240 | .create_handle = drm_gem_fb_create_handle, | |
241 | }; | |
242 | ||
243 | /** | |
2e187b20 NT |
244 | * drm_gem_fb_create() - Helper function for the |
245 | * &drm_mode_config_funcs.fb_create callback | |
4c3dbb2c | 246 | * @dev: DRM device |
2e187b20 NT |
247 | * @file: DRM file that holds the GEM handle(s) backing the framebuffer |
248 | * @mode_cmd: Metadata from the userspace framebuffer creation request | |
249 | * | |
250 | * This function creates a new framebuffer object described by | |
251 | * &drm_mode_fb_cmd2. This description includes handles for the buffer(s) | |
252 | * backing the framebuffer. | |
4c3dbb2c NT |
253 | * |
254 | * If your hardware has special alignment or pitch requirements these should be | |
255 | * checked before calling this function. The function does buffer size | |
dbd62e16 NT |
256 | * validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer |
257 | * flushing. | |
2e187b20 NT |
258 | * |
259 | * Drivers can use this as their &drm_mode_config_funcs.fb_create callback. | |
260 | * The ADDFB2 IOCTL calls into this callback. | |
261 | * | |
262 | * Returns: | |
263 | * Pointer to a &drm_framebuffer on success or an error pointer on failure. | |
4c3dbb2c NT |
264 | */ |
265 | struct drm_framebuffer * | |
266 | drm_gem_fb_create(struct drm_device *dev, struct drm_file *file, | |
267 | const struct drm_mode_fb_cmd2 *mode_cmd) | |
268 | { | |
269 | return drm_gem_fb_create_with_funcs(dev, file, mode_cmd, | |
270 | &drm_gem_fb_funcs); | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(drm_gem_fb_create); | |
273 | ||
dbd62e16 NT |
274 | static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = { |
275 | .destroy = drm_gem_fb_destroy, | |
276 | .create_handle = drm_gem_fb_create_handle, | |
277 | .dirty = drm_atomic_helper_dirtyfb, | |
278 | }; | |
279 | ||
280 | /** | |
281 | * drm_gem_fb_create_with_dirty() - Helper function for the | |
282 | * &drm_mode_config_funcs.fb_create callback | |
283 | * @dev: DRM device | |
284 | * @file: DRM file that holds the GEM handle(s) backing the framebuffer | |
285 | * @mode_cmd: Metadata from the userspace framebuffer creation request | |
286 | * | |
287 | * This function creates a new framebuffer object described by | |
288 | * &drm_mode_fb_cmd2. This description includes handles for the buffer(s) | |
289 | * backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty | |
290 | * callback giving framebuffer flushing through the atomic machinery. Use | |
291 | * drm_gem_fb_create() if you don't need the dirty callback. | |
292 | * The function does buffer size validation. | |
293 | * | |
294 | * Drivers should also call drm_plane_enable_fb_damage_clips() on all planes | |
295 | * to enable userspace to use damage clips also with the ATOMIC IOCTL. | |
296 | * | |
297 | * Drivers can use this as their &drm_mode_config_funcs.fb_create callback. | |
298 | * The ADDFB2 IOCTL calls into this callback. | |
299 | * | |
300 | * Returns: | |
301 | * Pointer to a &drm_framebuffer on success or an error pointer on failure. | |
302 | */ | |
303 | struct drm_framebuffer * | |
304 | drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file, | |
305 | const struct drm_mode_fb_cmd2 *mode_cmd) | |
306 | { | |
307 | return drm_gem_fb_create_with_funcs(dev, file, mode_cmd, | |
308 | &drm_gem_fb_funcs_dirtyfb); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty); | |
311 | ||
37408cd8 TZ |
312 | /** |
313 | * drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access | |
314 | * @fb: the framebuffer | |
315 | * @dir: access mode | |
316 | * | |
317 | * Prepares a framebuffer's GEM buffer objects for CPU access. This function | |
318 | * must be called before accessing the BO data within the kernel. For imported | |
319 | * BOs, the function calls dma_buf_begin_cpu_access(). | |
320 | * | |
321 | * See drm_gem_fb_end_cpu_access() for signalling the end of CPU access. | |
322 | * | |
323 | * Returns: | |
324 | * 0 on success, or a negative errno code otherwise. | |
325 | */ | |
326 | int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir) | |
327 | { | |
328 | struct dma_buf_attachment *import_attach; | |
329 | struct drm_gem_object *obj; | |
330 | size_t i; | |
331 | int ret, ret2; | |
332 | ||
333 | for (i = 0; i < ARRAY_SIZE(fb->obj); ++i) { | |
334 | obj = drm_gem_fb_get_obj(fb, i); | |
335 | if (!obj) | |
336 | continue; | |
337 | import_attach = obj->import_attach; | |
338 | if (!import_attach) | |
339 | continue; | |
340 | ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir); | |
341 | if (ret) | |
342 | goto err_dma_buf_end_cpu_access; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | ||
347 | err_dma_buf_end_cpu_access: | |
348 | while (i) { | |
349 | --i; | |
350 | obj = drm_gem_fb_get_obj(fb, i); | |
351 | if (!obj) | |
352 | continue; | |
353 | import_attach = obj->import_attach; | |
354 | if (!import_attach) | |
355 | continue; | |
356 | ret2 = dma_buf_end_cpu_access(import_attach->dmabuf, dir); | |
357 | if (ret2) { | |
358 | drm_err(fb->dev, | |
359 | "dma_buf_end_cpu_access() failed during error handling: %d\n", | |
360 | ret2); | |
361 | } | |
362 | } | |
363 | ||
364 | return ret; | |
365 | } | |
366 | EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access); | |
367 | ||
368 | /** | |
369 | * drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects | |
370 | * @fb: the framebuffer | |
371 | * @dir: access mode | |
372 | * | |
373 | * Signals the end of CPU access to the given framebuffer's GEM buffer objects. This | |
374 | * function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access(). | |
375 | * For imported BOs, the function calls dma_buf_end_cpu_access(). | |
376 | * | |
377 | * See also drm_gem_fb_begin_cpu_access(). | |
378 | */ | |
379 | void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir) | |
380 | { | |
381 | size_t i = ARRAY_SIZE(fb->obj); | |
382 | struct dma_buf_attachment *import_attach; | |
383 | struct drm_gem_object *obj; | |
384 | int ret; | |
385 | ||
386 | while (i) { | |
387 | --i; | |
388 | obj = drm_gem_fb_get_obj(fb, i); | |
389 | if (!obj) | |
390 | continue; | |
391 | import_attach = obj->import_attach; | |
392 | if (!import_attach) | |
393 | continue; | |
394 | ret = dma_buf_end_cpu_access(import_attach->dmabuf, dir); | |
395 | if (ret) | |
396 | drm_err(fb->dev, "dma_buf_end_cpu_access() failed: %d\n", ret); | |
397 | } | |
398 | } | |
399 | EXPORT_SYMBOL(drm_gem_fb_end_cpu_access); | |
400 | ||
bcf6293d AP |
401 | static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev, |
402 | const struct drm_mode_fb_cmd2 *mode_cmd) | |
403 | { | |
404 | const struct drm_format_info *info; | |
405 | ||
406 | info = drm_get_format_info(dev, mode_cmd); | |
407 | ||
408 | /* use whatever a driver has set */ | |
409 | if (info->cpp[0]) | |
410 | return info->cpp[0] * 8; | |
411 | ||
412 | /* guess otherwise */ | |
413 | switch (info->format) { | |
414 | case DRM_FORMAT_YUV420_8BIT: | |
415 | return 12; | |
416 | case DRM_FORMAT_YUV420_10BIT: | |
417 | return 15; | |
418 | case DRM_FORMAT_VUY101010: | |
419 | return 30; | |
420 | default: | |
421 | break; | |
422 | } | |
423 | ||
424 | /* all attempts failed */ | |
425 | return 0; | |
426 | } | |
427 | ||
55f7f727 AP |
428 | static int drm_gem_afbc_min_size(struct drm_device *dev, |
429 | const struct drm_mode_fb_cmd2 *mode_cmd, | |
430 | struct drm_afbc_framebuffer *afbc_fb) | |
431 | { | |
55f7f727 AP |
432 | __u32 n_blocks, w_alignment, h_alignment, hdr_alignment; |
433 | /* remove bpp when all users properly encode cpp in drm_format_info */ | |
434 | __u32 bpp; | |
435 | ||
436 | switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) { | |
437 | case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16: | |
438 | afbc_fb->block_width = 16; | |
439 | afbc_fb->block_height = 16; | |
440 | break; | |
441 | case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8: | |
442 | afbc_fb->block_width = 32; | |
443 | afbc_fb->block_height = 8; | |
444 | break; | |
445 | /* no user exists yet - fall through */ | |
446 | case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4: | |
447 | case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4: | |
448 | default: | |
88f1b29a AP |
449 | drm_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n", |
450 | mode_cmd->modifier[0] | |
451 | & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK); | |
55f7f727 AP |
452 | return -EINVAL; |
453 | } | |
454 | ||
455 | /* tiled header afbc */ | |
456 | w_alignment = afbc_fb->block_width; | |
457 | h_alignment = afbc_fb->block_height; | |
458 | hdr_alignment = AFBC_HDR_ALIGN; | |
459 | if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) { | |
460 | w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT; | |
461 | h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT; | |
462 | hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT; | |
463 | } | |
464 | ||
465 | afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment); | |
466 | afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment); | |
467 | afbc_fb->offset = mode_cmd->offsets[0]; | |
468 | ||
bcf6293d AP |
469 | bpp = drm_gem_afbc_get_bpp(dev, mode_cmd); |
470 | if (!bpp) { | |
471 | drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp); | |
472 | return -EINVAL; | |
473 | } | |
55f7f727 AP |
474 | |
475 | n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height) | |
476 | / AFBC_SUPERBLOCK_PIXELS; | |
477 | afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment); | |
478 | afbc_fb->afbc_size += n_blocks * ALIGN(bpp * AFBC_SUPERBLOCK_PIXELS / 8, | |
479 | AFBC_SUPERBLOCK_ALIGNMENT); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | /** | |
485 | * drm_gem_fb_afbc_init() - Helper function for drivers using afbc to | |
486 | * fill and validate all the afbc-specific | |
487 | * struct drm_afbc_framebuffer members | |
488 | * | |
489 | * @dev: DRM device | |
490 | * @afbc_fb: afbc-specific framebuffer | |
491 | * @mode_cmd: Metadata from the userspace framebuffer creation request | |
492 | * @afbc_fb: afbc framebuffer | |
493 | * | |
494 | * This function can be used by drivers which support afbc to complete | |
495 | * the preparation of struct drm_afbc_framebuffer. It must be called after | |
496 | * allocating the said struct and calling drm_gem_fb_init_with_funcs(). | |
497 | * It is caller's responsibility to put afbc_fb->base.obj objects in case | |
498 | * the call is unsuccessful. | |
499 | * | |
500 | * Returns: | |
501 | * Zero on success or a negative error value on failure. | |
502 | */ | |
503 | int drm_gem_fb_afbc_init(struct drm_device *dev, | |
504 | const struct drm_mode_fb_cmd2 *mode_cmd, | |
505 | struct drm_afbc_framebuffer *afbc_fb) | |
506 | { | |
507 | const struct drm_format_info *info; | |
508 | struct drm_gem_object **objs; | |
509 | int ret; | |
510 | ||
511 | objs = afbc_fb->base.obj; | |
512 | info = drm_get_format_info(dev, mode_cmd); | |
513 | if (!info) | |
514 | return -EINVAL; | |
515 | ||
516 | ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb); | |
517 | if (ret < 0) | |
518 | return ret; | |
519 | ||
520 | if (objs[0]->size < afbc_fb->afbc_size) | |
521 | return -EINVAL; | |
522 | ||
523 | return 0; | |
524 | } | |
525 | EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init); |