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7520a277 DV |
1 | /* |
2 | * Copyright (c) 2016 Intel Corporation | |
3 | * | |
4 | * Permission to use, copy, modify, distribute, and sell this software and its | |
5 | * documentation for any purpose is hereby granted without fee, provided that | |
6 | * the above copyright notice appear in all copies and that both that copyright | |
7 | * notice and this permission notice appear in supporting documentation, and | |
8 | * that the name of the copyright holders not be used in advertising or | |
9 | * publicity pertaining to distribution of the software without specific, | |
10 | * written prior permission. The copyright holders make no representations | |
11 | * about the suitability of this software for any purpose. It is provided "as | |
12 | * is" without express or implied warranty. | |
13 | * | |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
20 | * OF THIS SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include <linux/export.h> | |
24 | #include <drm/drmP.h> | |
25 | #include <drm/drm_auth.h> | |
26 | #include <drm/drm_framebuffer.h> | |
941b8caa | 27 | #include <drm/drm_atomic.h> |
7520a277 DV |
28 | |
29 | #include "drm_crtc_internal.h" | |
30 | ||
750fb8c4 DV |
31 | /** |
32 | * DOC: overview | |
33 | * | |
34 | * Frame buffers are abstract memory objects that provide a source of pixels to | |
35 | * scanout to a CRTC. Applications explicitly request the creation of frame | |
36 | * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque | |
37 | * handle that can be passed to the KMS CRTC control, plane configuration and | |
38 | * page flip functions. | |
39 | * | |
40 | * Frame buffers rely on the underlying memory manager for allocating backing | |
41 | * storage. When creating a frame buffer applications pass a memory handle | |
42 | * (or a list of memory handles for multi-planar formats) through the | |
ea0dd85a | 43 | * &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace |
750fb8c4 DV |
44 | * buffer management interface this would be a GEM handle. Drivers are however |
45 | * free to use their own backing storage object handles, e.g. vmwgfx directly | |
46 | * exposes special TTM handles to userspace and so expects TTM handles in the | |
47 | * create ioctl and not GEM handles. | |
48 | * | |
ea0dd85a | 49 | * Framebuffers are tracked with &struct drm_framebuffer. They are published |
750fb8c4 DV |
50 | * using drm_framebuffer_init() - after calling that function userspace can use |
51 | * and access the framebuffer object. The helper function | |
52 | * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required | |
53 | * metadata fields. | |
54 | * | |
55 | * The lifetime of a drm framebuffer is controlled with a reference count, | |
a4a69da0 TR |
56 | * drivers can grab additional references with drm_framebuffer_get() and drop |
57 | * them again with drm_framebuffer_put(). For driver-private framebuffers for | |
58 | * which the last reference is never dropped (e.g. for the fbdev framebuffer | |
59 | * when the struct &struct drm_framebuffer is embedded into the fbdev helper | |
60 | * struct) drivers can manually clean up a framebuffer at module unload time | |
61 | * with drm_framebuffer_unregister_private(). But doing this is not | |
62 | * recommended, and it's better to have a normal free-standing &struct | |
d574528a | 63 | * drm_framebuffer. |
750fb8c4 DV |
64 | */ |
65 | ||
43968d7b DV |
66 | int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y, |
67 | uint32_t src_w, uint32_t src_h, | |
68 | const struct drm_framebuffer *fb) | |
69 | { | |
70 | unsigned int fb_width, fb_height; | |
71 | ||
72 | fb_width = fb->width << 16; | |
73 | fb_height = fb->height << 16; | |
74 | ||
75 | /* Make sure source coordinates are inside the fb. */ | |
76 | if (src_w > fb_width || | |
77 | src_x > fb_width - src_w || | |
78 | src_h > fb_height || | |
79 | src_y > fb_height - src_h) { | |
80 | DRM_DEBUG_KMS("Invalid source coordinates " | |
81 | "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n", | |
82 | src_w >> 16, ((src_w & 0xffff) * 15625) >> 10, | |
83 | src_h >> 16, ((src_h & 0xffff) * 15625) >> 10, | |
84 | src_x >> 16, ((src_x & 0xffff) * 15625) >> 10, | |
85 | src_y >> 16, ((src_y & 0xffff) * 15625) >> 10); | |
86 | return -ENOSPC; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
7520a277 DV |
92 | /** |
93 | * drm_mode_addfb - add an FB to the graphics configuration | |
94 | * @dev: drm device for the ioctl | |
95 | * @data: data pointer for the ioctl | |
96 | * @file_priv: drm file for the ioctl call | |
97 | * | |
98 | * Add a new FB to the specified CRTC, given a user request. This is the | |
99 | * original addfb ioctl which only supported RGB formats. | |
100 | * | |
101 | * Called by the user via ioctl. | |
102 | * | |
103 | * Returns: | |
104 | * Zero on success, negative errno on failure. | |
105 | */ | |
106 | int drm_mode_addfb(struct drm_device *dev, | |
107 | void *data, struct drm_file *file_priv) | |
108 | { | |
109 | struct drm_mode_fb_cmd *or = data; | |
110 | struct drm_mode_fb_cmd2 r = {}; | |
111 | int ret; | |
112 | ||
113 | /* convert to new format and call new ioctl */ | |
114 | r.fb_id = or->fb_id; | |
115 | r.width = or->width; | |
116 | r.height = or->height; | |
117 | r.pitches[0] = or->pitch; | |
118 | r.pixel_format = drm_mode_legacy_fb_format(or->bpp, or->depth); | |
119 | r.handles[0] = or->handle; | |
120 | ||
121 | ret = drm_mode_addfb2(dev, &r, file_priv); | |
122 | if (ret) | |
123 | return ret; | |
124 | ||
125 | or->fb_id = r.fb_id; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
568c5e45 VS |
130 | static int fb_plane_width(int width, |
131 | const struct drm_format_info *format, int plane) | |
132 | { | |
133 | if (plane == 0) | |
134 | return width; | |
135 | ||
33f673aa | 136 | return DIV_ROUND_UP(width, format->hsub); |
568c5e45 VS |
137 | } |
138 | ||
139 | static int fb_plane_height(int height, | |
140 | const struct drm_format_info *format, int plane) | |
141 | { | |
142 | if (plane == 0) | |
143 | return height; | |
144 | ||
33f673aa | 145 | return DIV_ROUND_UP(height, format->vsub); |
568c5e45 VS |
146 | } |
147 | ||
6a0f9ebf VS |
148 | static int framebuffer_check(struct drm_device *dev, |
149 | const struct drm_mode_fb_cmd2 *r) | |
7520a277 | 150 | { |
d5493490 LP |
151 | const struct drm_format_info *info; |
152 | int i; | |
7520a277 | 153 | |
6a0f9ebf | 154 | /* check if the format is supported at all */ |
333d2da5 | 155 | info = __drm_format_info(r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN); |
d5493490 | 156 | if (!info) { |
b3c11ac2 EE |
157 | struct drm_format_name_buf format_name; |
158 | DRM_DEBUG_KMS("bad framebuffer format %s\n", | |
159 | drm_get_format_name(r->pixel_format, | |
160 | &format_name)); | |
d5493490 | 161 | return -EINVAL; |
7520a277 DV |
162 | } |
163 | ||
6a0f9ebf VS |
164 | /* now let the driver pick its own format info */ |
165 | info = drm_get_format_info(dev, r); | |
166 | ||
33f673aa | 167 | if (r->width == 0) { |
7520a277 DV |
168 | DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width); |
169 | return -EINVAL; | |
170 | } | |
171 | ||
33f673aa | 172 | if (r->height == 0) { |
7520a277 DV |
173 | DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height); |
174 | return -EINVAL; | |
175 | } | |
176 | ||
d5493490 | 177 | for (i = 0; i < info->num_planes; i++) { |
568c5e45 VS |
178 | unsigned int width = fb_plane_width(r->width, info, i); |
179 | unsigned int height = fb_plane_height(r->height, info, i); | |
d5493490 | 180 | unsigned int cpp = info->cpp[i]; |
7520a277 DV |
181 | |
182 | if (!r->handles[i]) { | |
183 | DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | if ((uint64_t) width * cpp > UINT_MAX) | |
188 | return -ERANGE; | |
189 | ||
190 | if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX) | |
191 | return -ERANGE; | |
192 | ||
193 | if (r->pitches[i] < width * cpp) { | |
194 | DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) { | |
199 | DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n", | |
200 | r->modifier[i], i); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
bae781b2 VS |
204 | if (r->flags & DRM_MODE_FB_MODIFIERS && |
205 | r->modifier[i] != r->modifier[0]) { | |
206 | DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n", | |
207 | r->modifier[i], i); | |
208 | return -EINVAL; | |
209 | } | |
210 | ||
7520a277 DV |
211 | /* modifier specific checks: */ |
212 | switch (r->modifier[i]) { | |
213 | case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE: | |
214 | /* NOTE: the pitch restriction may be lifted later if it turns | |
215 | * out that no hw has this restriction: | |
216 | */ | |
217 | if (r->pixel_format != DRM_FORMAT_NV12 || | |
218 | width % 128 || height % 32 || | |
219 | r->pitches[i] % 128) { | |
220 | DRM_DEBUG_KMS("bad modifier data for plane %d\n", i); | |
221 | return -EINVAL; | |
222 | } | |
223 | break; | |
224 | ||
225 | default: | |
226 | break; | |
227 | } | |
228 | } | |
229 | ||
d5493490 | 230 | for (i = info->num_planes; i < 4; i++) { |
7520a277 DV |
231 | if (r->modifier[i]) { |
232 | DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i); | |
233 | return -EINVAL; | |
234 | } | |
235 | ||
236 | /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */ | |
237 | if (!(r->flags & DRM_MODE_FB_MODIFIERS)) | |
238 | continue; | |
239 | ||
240 | if (r->handles[i]) { | |
241 | DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i); | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | if (r->pitches[i]) { | |
246 | DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i); | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
250 | if (r->offsets[i]) { | |
251 | DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i); | |
252 | return -EINVAL; | |
253 | } | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | struct drm_framebuffer * | |
260 | drm_internal_framebuffer_create(struct drm_device *dev, | |
261 | const struct drm_mode_fb_cmd2 *r, | |
262 | struct drm_file *file_priv) | |
263 | { | |
264 | struct drm_mode_config *config = &dev->mode_config; | |
265 | struct drm_framebuffer *fb; | |
266 | int ret; | |
267 | ||
268 | if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) { | |
269 | DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags); | |
270 | return ERR_PTR(-EINVAL); | |
271 | } | |
272 | ||
273 | if ((config->min_width > r->width) || (r->width > config->max_width)) { | |
274 | DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n", | |
275 | r->width, config->min_width, config->max_width); | |
276 | return ERR_PTR(-EINVAL); | |
277 | } | |
278 | if ((config->min_height > r->height) || (r->height > config->max_height)) { | |
279 | DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n", | |
280 | r->height, config->min_height, config->max_height); | |
281 | return ERR_PTR(-EINVAL); | |
282 | } | |
283 | ||
284 | if (r->flags & DRM_MODE_FB_MODIFIERS && | |
285 | !dev->mode_config.allow_fb_modifiers) { | |
286 | DRM_DEBUG_KMS("driver does not support fb modifiers\n"); | |
287 | return ERR_PTR(-EINVAL); | |
288 | } | |
289 | ||
6a0f9ebf | 290 | ret = framebuffer_check(dev, r); |
7520a277 DV |
291 | if (ret) |
292 | return ERR_PTR(ret); | |
293 | ||
294 | fb = dev->mode_config.funcs->fb_create(dev, file_priv, r); | |
295 | if (IS_ERR(fb)) { | |
296 | DRM_DEBUG_KMS("could not create framebuffer\n"); | |
297 | return fb; | |
298 | } | |
299 | ||
300 | return fb; | |
301 | } | |
302 | ||
303 | /** | |
304 | * drm_mode_addfb2 - add an FB to the graphics configuration | |
305 | * @dev: drm device for the ioctl | |
306 | * @data: data pointer for the ioctl | |
307 | * @file_priv: drm file for the ioctl call | |
308 | * | |
309 | * Add a new FB to the specified CRTC, given a user request with format. This is | |
310 | * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers | |
311 | * and uses fourcc codes as pixel format specifiers. | |
312 | * | |
313 | * Called by the user via ioctl. | |
314 | * | |
315 | * Returns: | |
316 | * Zero on success, negative errno on failure. | |
317 | */ | |
318 | int drm_mode_addfb2(struct drm_device *dev, | |
319 | void *data, struct drm_file *file_priv) | |
320 | { | |
321 | struct drm_mode_fb_cmd2 *r = data; | |
322 | struct drm_framebuffer *fb; | |
323 | ||
324 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
325 | return -EINVAL; | |
326 | ||
327 | fb = drm_internal_framebuffer_create(dev, r, file_priv); | |
328 | if (IS_ERR(fb)) | |
329 | return PTR_ERR(fb); | |
330 | ||
331 | DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id); | |
332 | r->fb_id = fb->base.id; | |
333 | ||
334 | /* Transfer ownership to the filp for reaping on close */ | |
335 | mutex_lock(&file_priv->fbs_lock); | |
336 | list_add(&fb->filp_head, &file_priv->fbs); | |
337 | mutex_unlock(&file_priv->fbs_lock); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | struct drm_mode_rmfb_work { | |
343 | struct work_struct work; | |
344 | struct list_head fbs; | |
345 | }; | |
346 | ||
347 | static void drm_mode_rmfb_work_fn(struct work_struct *w) | |
348 | { | |
349 | struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work); | |
350 | ||
351 | while (!list_empty(&arg->fbs)) { | |
352 | struct drm_framebuffer *fb = | |
353 | list_first_entry(&arg->fbs, typeof(*fb), filp_head); | |
354 | ||
355 | list_del_init(&fb->filp_head); | |
356 | drm_framebuffer_remove(fb); | |
357 | } | |
358 | } | |
359 | ||
360 | /** | |
361 | * drm_mode_rmfb - remove an FB from the configuration | |
362 | * @dev: drm device for the ioctl | |
363 | * @data: data pointer for the ioctl | |
364 | * @file_priv: drm file for the ioctl call | |
365 | * | |
366 | * Remove the FB specified by the user. | |
367 | * | |
368 | * Called by the user via ioctl. | |
369 | * | |
370 | * Returns: | |
371 | * Zero on success, negative errno on failure. | |
372 | */ | |
373 | int drm_mode_rmfb(struct drm_device *dev, | |
374 | void *data, struct drm_file *file_priv) | |
375 | { | |
376 | struct drm_framebuffer *fb = NULL; | |
377 | struct drm_framebuffer *fbl = NULL; | |
378 | uint32_t *id = data; | |
379 | int found = 0; | |
380 | ||
381 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
382 | return -EINVAL; | |
383 | ||
384 | fb = drm_framebuffer_lookup(dev, *id); | |
385 | if (!fb) | |
386 | return -ENOENT; | |
387 | ||
388 | mutex_lock(&file_priv->fbs_lock); | |
389 | list_for_each_entry(fbl, &file_priv->fbs, filp_head) | |
390 | if (fb == fbl) | |
391 | found = 1; | |
392 | if (!found) { | |
393 | mutex_unlock(&file_priv->fbs_lock); | |
394 | goto fail_unref; | |
395 | } | |
396 | ||
397 | list_del_init(&fb->filp_head); | |
398 | mutex_unlock(&file_priv->fbs_lock); | |
399 | ||
400 | /* drop the reference we picked up in framebuffer lookup */ | |
a4a69da0 | 401 | drm_framebuffer_put(fb); |
7520a277 DV |
402 | |
403 | /* | |
404 | * we now own the reference that was stored in the fbs list | |
405 | * | |
406 | * drm_framebuffer_remove may fail with -EINTR on pending signals, | |
407 | * so run this in a separate stack as there's no way to correctly | |
408 | * handle this after the fb is already removed from the lookup table. | |
409 | */ | |
410 | if (drm_framebuffer_read_refcount(fb) > 1) { | |
411 | struct drm_mode_rmfb_work arg; | |
412 | ||
413 | INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn); | |
414 | INIT_LIST_HEAD(&arg.fbs); | |
415 | list_add_tail(&fb->filp_head, &arg.fbs); | |
416 | ||
417 | schedule_work(&arg.work); | |
418 | flush_work(&arg.work); | |
419 | destroy_work_on_stack(&arg.work); | |
420 | } else | |
a4a69da0 | 421 | drm_framebuffer_put(fb); |
7520a277 DV |
422 | |
423 | return 0; | |
424 | ||
425 | fail_unref: | |
a4a69da0 | 426 | drm_framebuffer_put(fb); |
7520a277 DV |
427 | return -ENOENT; |
428 | } | |
429 | ||
430 | /** | |
431 | * drm_mode_getfb - get FB info | |
432 | * @dev: drm device for the ioctl | |
433 | * @data: data pointer for the ioctl | |
434 | * @file_priv: drm file for the ioctl call | |
435 | * | |
436 | * Lookup the FB given its ID and return info about it. | |
437 | * | |
438 | * Called by the user via ioctl. | |
439 | * | |
440 | * Returns: | |
441 | * Zero on success, negative errno on failure. | |
442 | */ | |
443 | int drm_mode_getfb(struct drm_device *dev, | |
444 | void *data, struct drm_file *file_priv) | |
445 | { | |
446 | struct drm_mode_fb_cmd *r = data; | |
447 | struct drm_framebuffer *fb; | |
448 | int ret; | |
449 | ||
450 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
451 | return -EINVAL; | |
452 | ||
453 | fb = drm_framebuffer_lookup(dev, r->fb_id); | |
454 | if (!fb) | |
455 | return -ENOENT; | |
456 | ||
457 | r->height = fb->height; | |
458 | r->width = fb->width; | |
b00c600e | 459 | r->depth = fb->format->depth; |
272725c7 | 460 | r->bpp = fb->format->cpp[0] * 8; |
7520a277 DV |
461 | r->pitch = fb->pitches[0]; |
462 | if (fb->funcs->create_handle) { | |
463 | if (drm_is_current_master(file_priv) || capable(CAP_SYS_ADMIN) || | |
464 | drm_is_control_client(file_priv)) { | |
465 | ret = fb->funcs->create_handle(fb, file_priv, | |
466 | &r->handle); | |
467 | } else { | |
468 | /* GET_FB() is an unprivileged ioctl so we must not | |
469 | * return a buffer-handle to non-master processes! For | |
470 | * backwards-compatibility reasons, we cannot make | |
471 | * GET_FB() privileged, so just return an invalid handle | |
472 | * for non-masters. */ | |
473 | r->handle = 0; | |
474 | ret = 0; | |
475 | } | |
476 | } else { | |
477 | ret = -ENODEV; | |
478 | } | |
479 | ||
a4a69da0 | 480 | drm_framebuffer_put(fb); |
7520a277 DV |
481 | |
482 | return ret; | |
483 | } | |
484 | ||
485 | /** | |
486 | * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB | |
487 | * @dev: drm device for the ioctl | |
488 | * @data: data pointer for the ioctl | |
489 | * @file_priv: drm file for the ioctl call | |
490 | * | |
491 | * Lookup the FB and flush out the damaged area supplied by userspace as a clip | |
492 | * rectangle list. Generic userspace which does frontbuffer rendering must call | |
493 | * this ioctl to flush out the changes on manual-update display outputs, e.g. | |
494 | * usb display-link, mipi manual update panels or edp panel self refresh modes. | |
495 | * | |
496 | * Modesetting drivers which always update the frontbuffer do not need to | |
d574528a | 497 | * implement the corresponding &drm_framebuffer_funcs.dirty callback. |
7520a277 DV |
498 | * |
499 | * Called by the user via ioctl. | |
500 | * | |
501 | * Returns: | |
502 | * Zero on success, negative errno on failure. | |
503 | */ | |
504 | int drm_mode_dirtyfb_ioctl(struct drm_device *dev, | |
505 | void *data, struct drm_file *file_priv) | |
506 | { | |
507 | struct drm_clip_rect __user *clips_ptr; | |
508 | struct drm_clip_rect *clips = NULL; | |
509 | struct drm_mode_fb_dirty_cmd *r = data; | |
510 | struct drm_framebuffer *fb; | |
511 | unsigned flags; | |
512 | int num_clips; | |
513 | int ret; | |
514 | ||
515 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
516 | return -EINVAL; | |
517 | ||
518 | fb = drm_framebuffer_lookup(dev, r->fb_id); | |
519 | if (!fb) | |
520 | return -ENOENT; | |
521 | ||
522 | num_clips = r->num_clips; | |
523 | clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr; | |
524 | ||
525 | if (!num_clips != !clips_ptr) { | |
526 | ret = -EINVAL; | |
527 | goto out_err1; | |
528 | } | |
529 | ||
530 | flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags; | |
531 | ||
532 | /* If userspace annotates copy, clips must come in pairs */ | |
533 | if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) { | |
534 | ret = -EINVAL; | |
535 | goto out_err1; | |
536 | } | |
537 | ||
538 | if (num_clips && clips_ptr) { | |
539 | if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) { | |
540 | ret = -EINVAL; | |
541 | goto out_err1; | |
542 | } | |
543 | clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL); | |
544 | if (!clips) { | |
545 | ret = -ENOMEM; | |
546 | goto out_err1; | |
547 | } | |
548 | ||
549 | ret = copy_from_user(clips, clips_ptr, | |
550 | num_clips * sizeof(*clips)); | |
551 | if (ret) { | |
552 | ret = -EFAULT; | |
553 | goto out_err2; | |
554 | } | |
555 | } | |
556 | ||
557 | if (fb->funcs->dirty) { | |
558 | ret = fb->funcs->dirty(fb, file_priv, flags, r->color, | |
559 | clips, num_clips); | |
560 | } else { | |
561 | ret = -ENOSYS; | |
562 | } | |
563 | ||
564 | out_err2: | |
565 | kfree(clips); | |
566 | out_err1: | |
a4a69da0 | 567 | drm_framebuffer_put(fb); |
7520a277 DV |
568 | |
569 | return ret; | |
570 | } | |
571 | ||
572 | /** | |
573 | * drm_fb_release - remove and free the FBs on this file | |
574 | * @priv: drm file for the ioctl | |
575 | * | |
576 | * Destroy all the FBs associated with @filp. | |
577 | * | |
578 | * Called by the user via ioctl. | |
579 | * | |
580 | * Returns: | |
581 | * Zero on success, negative errno on failure. | |
582 | */ | |
583 | void drm_fb_release(struct drm_file *priv) | |
584 | { | |
585 | struct drm_framebuffer *fb, *tfb; | |
586 | struct drm_mode_rmfb_work arg; | |
587 | ||
588 | INIT_LIST_HEAD(&arg.fbs); | |
589 | ||
590 | /* | |
591 | * When the file gets released that means no one else can access the fb | |
592 | * list any more, so no need to grab fpriv->fbs_lock. And we need to | |
593 | * avoid upsetting lockdep since the universal cursor code adds a | |
594 | * framebuffer while holding mutex locks. | |
595 | * | |
596 | * Note that a real deadlock between fpriv->fbs_lock and the modeset | |
597 | * locks is impossible here since no one else but this function can get | |
598 | * at it any more. | |
599 | */ | |
600 | list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) { | |
601 | if (drm_framebuffer_read_refcount(fb) > 1) { | |
602 | list_move_tail(&fb->filp_head, &arg.fbs); | |
603 | } else { | |
604 | list_del_init(&fb->filp_head); | |
605 | ||
606 | /* This drops the fpriv->fbs reference. */ | |
a4a69da0 | 607 | drm_framebuffer_put(fb); |
7520a277 DV |
608 | } |
609 | } | |
610 | ||
611 | if (!list_empty(&arg.fbs)) { | |
612 | INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn); | |
613 | ||
614 | schedule_work(&arg.work); | |
615 | flush_work(&arg.work); | |
616 | destroy_work_on_stack(&arg.work); | |
617 | } | |
618 | } | |
619 | ||
620 | void drm_framebuffer_free(struct kref *kref) | |
621 | { | |
622 | struct drm_framebuffer *fb = | |
623 | container_of(kref, struct drm_framebuffer, base.refcount); | |
624 | struct drm_device *dev = fb->dev; | |
625 | ||
626 | /* | |
627 | * The lookup idr holds a weak reference, which has not necessarily been | |
628 | * removed at this point. Check for that. | |
629 | */ | |
630 | drm_mode_object_unregister(dev, &fb->base); | |
631 | ||
632 | fb->funcs->destroy(fb); | |
633 | } | |
634 | ||
635 | /** | |
636 | * drm_framebuffer_init - initialize a framebuffer | |
637 | * @dev: DRM device | |
638 | * @fb: framebuffer to be initialized | |
639 | * @funcs: ... with these functions | |
640 | * | |
641 | * Allocates an ID for the framebuffer's parent mode object, sets its mode | |
642 | * functions & device file and adds it to the master fd list. | |
643 | * | |
644 | * IMPORTANT: | |
645 | * This functions publishes the fb and makes it available for concurrent access | |
646 | * by other users. Which means by this point the fb _must_ be fully set up - | |
647 | * since all the fb attributes are invariant over its lifetime, no further | |
648 | * locking but only correct reference counting is required. | |
649 | * | |
650 | * Returns: | |
651 | * Zero on success, error code on failure. | |
652 | */ | |
653 | int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb, | |
654 | const struct drm_framebuffer_funcs *funcs) | |
655 | { | |
656 | int ret; | |
657 | ||
570cec32 | 658 | if (WARN_ON_ONCE(fb->dev != dev || !fb->format)) |
95bce760 VS |
659 | return -EINVAL; |
660 | ||
7520a277 | 661 | INIT_LIST_HEAD(&fb->filp_head); |
95bce760 | 662 | |
7520a277 DV |
663 | fb->funcs = funcs; |
664 | ||
2135ea7a TR |
665 | ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB, |
666 | false, drm_framebuffer_free); | |
7520a277 DV |
667 | if (ret) |
668 | goto out; | |
669 | ||
670 | mutex_lock(&dev->mode_config.fb_lock); | |
671 | dev->mode_config.num_fb++; | |
672 | list_add(&fb->head, &dev->mode_config.fb_list); | |
673 | mutex_unlock(&dev->mode_config.fb_lock); | |
674 | ||
675 | drm_mode_object_register(dev, &fb->base); | |
676 | out: | |
677 | return ret; | |
678 | } | |
679 | EXPORT_SYMBOL(drm_framebuffer_init); | |
680 | ||
681 | /** | |
682 | * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference | |
683 | * @dev: drm device | |
684 | * @id: id of the fb object | |
685 | * | |
686 | * If successful, this grabs an additional reference to the framebuffer - | |
687 | * callers need to make sure to eventually unreference the returned framebuffer | |
a4a69da0 | 688 | * again, using drm_framebuffer_put(). |
7520a277 DV |
689 | */ |
690 | struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev, | |
691 | uint32_t id) | |
692 | { | |
693 | struct drm_mode_object *obj; | |
694 | struct drm_framebuffer *fb = NULL; | |
695 | ||
696 | obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_FB); | |
697 | if (obj) | |
698 | fb = obj_to_fb(obj); | |
699 | return fb; | |
700 | } | |
701 | EXPORT_SYMBOL(drm_framebuffer_lookup); | |
702 | ||
703 | /** | |
704 | * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr | |
705 | * @fb: fb to unregister | |
706 | * | |
707 | * Drivers need to call this when cleaning up driver-private framebuffers, e.g. | |
708 | * those used for fbdev. Note that the caller must hold a reference of it's own, | |
709 | * i.e. the object may not be destroyed through this call (since it'll lead to a | |
710 | * locking inversion). | |
03e93ac7 RZ |
711 | * |
712 | * NOTE: This function is deprecated. For driver-private framebuffers it is not | |
713 | * recommended to embed a framebuffer struct info fbdev struct, instead, a | |
a4a69da0 TR |
714 | * framebuffer pointer is preferred and drm_framebuffer_put() should be called |
715 | * when the framebuffer is to be cleaned up. | |
7520a277 DV |
716 | */ |
717 | void drm_framebuffer_unregister_private(struct drm_framebuffer *fb) | |
718 | { | |
719 | struct drm_device *dev; | |
720 | ||
721 | if (!fb) | |
722 | return; | |
723 | ||
724 | dev = fb->dev; | |
725 | ||
726 | /* Mark fb as reaped and drop idr ref. */ | |
727 | drm_mode_object_unregister(dev, &fb->base); | |
728 | } | |
729 | EXPORT_SYMBOL(drm_framebuffer_unregister_private); | |
730 | ||
731 | /** | |
732 | * drm_framebuffer_cleanup - remove a framebuffer object | |
733 | * @fb: framebuffer to remove | |
734 | * | |
735 | * Cleanup framebuffer. This function is intended to be used from the drivers | |
d574528a DV |
736 | * &drm_framebuffer_funcs.destroy callback. It can also be used to clean up |
737 | * driver private framebuffers embedded into a larger structure. | |
7520a277 | 738 | * |
d574528a | 739 | * Note that this function does not remove the fb from active usage - if it is |
7520a277 DV |
740 | * still used anywhere, hilarity can ensue since userspace could call getfb on |
741 | * the id and get back -EINVAL. Obviously no concern at driver unload time. | |
742 | * | |
743 | * Also, the framebuffer will not be removed from the lookup idr - for | |
744 | * user-created framebuffers this will happen in in the rmfb ioctl. For | |
745 | * driver-private objects (e.g. for fbdev) drivers need to explicitly call | |
746 | * drm_framebuffer_unregister_private. | |
747 | */ | |
748 | void drm_framebuffer_cleanup(struct drm_framebuffer *fb) | |
749 | { | |
750 | struct drm_device *dev = fb->dev; | |
751 | ||
752 | mutex_lock(&dev->mode_config.fb_lock); | |
753 | list_del(&fb->head); | |
754 | dev->mode_config.num_fb--; | |
755 | mutex_unlock(&dev->mode_config.fb_lock); | |
756 | } | |
757 | EXPORT_SYMBOL(drm_framebuffer_cleanup); | |
758 | ||
941b8caa DV |
759 | static int atomic_remove_fb(struct drm_framebuffer *fb) |
760 | { | |
761 | struct drm_modeset_acquire_ctx ctx; | |
762 | struct drm_device *dev = fb->dev; | |
763 | struct drm_atomic_state *state; | |
764 | struct drm_plane *plane; | |
765 | struct drm_connector *conn; | |
766 | struct drm_connector_state *conn_state; | |
767 | int i, ret = 0; | |
768 | unsigned plane_mask; | |
769 | ||
770 | state = drm_atomic_state_alloc(dev); | |
771 | if (!state) | |
772 | return -ENOMEM; | |
773 | ||
774 | drm_modeset_acquire_init(&ctx, 0); | |
775 | state->acquire_ctx = &ctx; | |
776 | ||
777 | retry: | |
778 | plane_mask = 0; | |
779 | ret = drm_modeset_lock_all_ctx(dev, &ctx); | |
780 | if (ret) | |
781 | goto unlock; | |
782 | ||
783 | drm_for_each_plane(plane, dev) { | |
784 | struct drm_plane_state *plane_state; | |
785 | ||
786 | if (plane->state->fb != fb) | |
787 | continue; | |
788 | ||
789 | plane_state = drm_atomic_get_plane_state(state, plane); | |
790 | if (IS_ERR(plane_state)) { | |
791 | ret = PTR_ERR(plane_state); | |
792 | goto unlock; | |
793 | } | |
794 | ||
795 | if (plane_state->crtc->primary == plane) { | |
796 | struct drm_crtc_state *crtc_state; | |
797 | ||
798 | crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc); | |
799 | ||
800 | ret = drm_atomic_add_affected_connectors(state, plane_state->crtc); | |
801 | if (ret) | |
802 | goto unlock; | |
803 | ||
804 | crtc_state->active = false; | |
805 | ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL); | |
806 | if (ret) | |
807 | goto unlock; | |
808 | } | |
809 | ||
810 | drm_atomic_set_fb_for_plane(plane_state, NULL); | |
811 | ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); | |
812 | if (ret) | |
813 | goto unlock; | |
814 | ||
815 | plane_mask |= BIT(drm_plane_index(plane)); | |
816 | ||
817 | plane->old_fb = plane->fb; | |
818 | } | |
819 | ||
0c3eb123 | 820 | for_each_new_connector_in_state(state, conn, conn_state, i) { |
941b8caa DV |
821 | ret = drm_atomic_set_crtc_for_connector(conn_state, NULL); |
822 | ||
823 | if (ret) | |
824 | goto unlock; | |
825 | } | |
826 | ||
827 | if (plane_mask) | |
828 | ret = drm_atomic_commit(state); | |
829 | ||
830 | unlock: | |
831 | if (plane_mask) | |
832 | drm_atomic_clean_old_fb(dev, plane_mask, ret); | |
833 | ||
834 | if (ret == -EDEADLK) { | |
4086d90c | 835 | drm_atomic_state_clear(state); |
941b8caa DV |
836 | drm_modeset_backoff(&ctx); |
837 | goto retry; | |
838 | } | |
839 | ||
840 | drm_atomic_state_put(state); | |
841 | ||
842 | drm_modeset_drop_locks(&ctx); | |
843 | drm_modeset_acquire_fini(&ctx); | |
844 | ||
845 | return ret; | |
846 | } | |
847 | ||
848 | static void legacy_remove_fb(struct drm_framebuffer *fb) | |
849 | { | |
850 | struct drm_device *dev = fb->dev; | |
851 | struct drm_crtc *crtc; | |
852 | struct drm_plane *plane; | |
853 | ||
854 | drm_modeset_lock_all(dev); | |
855 | /* remove from any CRTC */ | |
856 | drm_for_each_crtc(crtc, dev) { | |
857 | if (crtc->primary->fb == fb) { | |
858 | /* should turn off the crtc */ | |
859 | if (drm_crtc_force_disable(crtc)) | |
860 | DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc); | |
861 | } | |
862 | } | |
863 | ||
864 | drm_for_each_plane(plane, dev) { | |
865 | if (plane->fb == fb) | |
866 | drm_plane_force_disable(plane); | |
867 | } | |
868 | drm_modeset_unlock_all(dev); | |
869 | } | |
870 | ||
7520a277 DV |
871 | /** |
872 | * drm_framebuffer_remove - remove and unreference a framebuffer object | |
873 | * @fb: framebuffer to remove | |
874 | * | |
875 | * Scans all the CRTCs and planes in @dev's mode_config. If they're | |
876 | * using @fb, removes it, setting it to NULL. Then drops the reference to the | |
877 | * passed-in framebuffer. Might take the modeset locks. | |
878 | * | |
879 | * Note that this function optimizes the cleanup away if the caller holds the | |
880 | * last reference to the framebuffer. It is also guaranteed to not take the | |
881 | * modeset locks in this case. | |
882 | */ | |
883 | void drm_framebuffer_remove(struct drm_framebuffer *fb) | |
884 | { | |
885 | struct drm_device *dev; | |
7520a277 DV |
886 | |
887 | if (!fb) | |
888 | return; | |
889 | ||
890 | dev = fb->dev; | |
891 | ||
892 | WARN_ON(!list_empty(&fb->filp_head)); | |
893 | ||
894 | /* | |
895 | * drm ABI mandates that we remove any deleted framebuffers from active | |
896 | * useage. But since most sane clients only remove framebuffers they no | |
897 | * longer need, try to optimize this away. | |
898 | * | |
899 | * Since we're holding a reference ourselves, observing a refcount of 1 | |
900 | * means that we're the last holder and can skip it. Also, the refcount | |
901 | * can never increase from 1 again, so we don't need any barriers or | |
902 | * locks. | |
903 | * | |
904 | * Note that userspace could try to race with use and instate a new | |
905 | * usage _after_ we've cleared all current ones. End result will be an | |
906 | * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot | |
907 | * in this manner. | |
908 | */ | |
909 | if (drm_framebuffer_read_refcount(fb) > 1) { | |
db8f6403 | 910 | if (drm_drv_uses_atomic_modeset(dev)) { |
941b8caa | 911 | int ret = atomic_remove_fb(fb); |
db8f6403 | 912 | WARN(ret, "atomic remove_fb failed with %i\n", ret); |
941b8caa DV |
913 | } else |
914 | legacy_remove_fb(fb); | |
7520a277 DV |
915 | } |
916 | ||
a4a69da0 | 917 | drm_framebuffer_put(fb); |
7520a277 DV |
918 | } |
919 | EXPORT_SYMBOL(drm_framebuffer_remove); | |
8f8f6a6c VS |
920 | |
921 | /** | |
922 | * drm_framebuffer_plane_width - width of the plane given the first plane | |
923 | * @width: width of the first plane | |
924 | * @fb: the framebuffer | |
925 | * @plane: plane index | |
926 | * | |
927 | * Returns: | |
928 | * The width of @plane, given that the width of the first plane is @width. | |
929 | */ | |
930 | int drm_framebuffer_plane_width(int width, | |
931 | const struct drm_framebuffer *fb, int plane) | |
932 | { | |
933 | if (plane >= fb->format->num_planes) | |
934 | return 0; | |
935 | ||
568c5e45 | 936 | return fb_plane_width(width, fb->format, plane); |
8f8f6a6c VS |
937 | } |
938 | EXPORT_SYMBOL(drm_framebuffer_plane_width); | |
939 | ||
940 | /** | |
941 | * drm_framebuffer_plane_height - height of the plane given the first plane | |
942 | * @height: height of the first plane | |
943 | * @fb: the framebuffer | |
944 | * @plane: plane index | |
945 | * | |
946 | * Returns: | |
947 | * The height of @plane, given that the height of the first plane is @height. | |
948 | */ | |
949 | int drm_framebuffer_plane_height(int height, | |
950 | const struct drm_framebuffer *fb, int plane) | |
951 | { | |
952 | if (plane >= fb->format->num_planes) | |
953 | return 0; | |
954 | ||
568c5e45 | 955 | return fb_plane_height(height, fb->format, plane); |
8f8f6a6c VS |
956 | } |
957 | EXPORT_SYMBOL(drm_framebuffer_plane_height); |