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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 <linux/uaccess.h>
25
26#include <drm/drm_atomic.h>
27#include <drm/drm_atomic_uapi.h>
28#include <drm/drm_auth.h>
29#include <drm/drm_debugfs.h>
30#include <drm/drm_drv.h>
31#include <drm/drm_file.h>
32#include <drm/drm_fourcc.h>
33#include <drm/drm_framebuffer.h>
34#include <drm/drm_gem.h>
35#include <drm/drm_print.h>
36#include <drm/drm_util.h>
37
38#include "drm_crtc_internal.h"
39#include "drm_internal.h"
40
41/**
42 * DOC: overview
43 *
44 * Frame buffers are abstract memory objects that provide a source of pixels to
45 * scanout to a CRTC. Applications explicitly request the creation of frame
46 * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
47 * handle that can be passed to the KMS CRTC control, plane configuration and
48 * page flip functions.
49 *
50 * Frame buffers rely on the underlying memory manager for allocating backing
51 * storage. When creating a frame buffer applications pass a memory handle
52 * (or a list of memory handles for multi-planar formats) through the
53 * &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
54 * buffer management interface this would be a GEM handle. Drivers are however
55 * free to use their own backing storage object handles, e.g. vmwgfx directly
56 * exposes special TTM handles to userspace and so expects TTM handles in the
57 * create ioctl and not GEM handles.
58 *
59 * Framebuffers are tracked with &struct drm_framebuffer. They are published
60 * using drm_framebuffer_init() - after calling that function userspace can use
61 * and access the framebuffer object. The helper function
62 * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
63 * metadata fields.
64 *
65 * The lifetime of a drm framebuffer is controlled with a reference count,
66 * drivers can grab additional references with drm_framebuffer_get() and drop
67 * them again with drm_framebuffer_put(). For driver-private framebuffers for
68 * which the last reference is never dropped (e.g. for the fbdev framebuffer
69 * when the struct &struct drm_framebuffer is embedded into the fbdev helper
70 * struct) drivers can manually clean up a framebuffer at module unload time
71 * with drm_framebuffer_unregister_private(). But doing this is not
72 * recommended, and it's better to have a normal free-standing &struct
73 * drm_framebuffer.
74 */
75
76int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
77 uint32_t src_w, uint32_t src_h,
78 const struct drm_framebuffer *fb)
79{
80 unsigned int fb_width, fb_height;
81
82 fb_width = fb->width << 16;
83 fb_height = fb->height << 16;
84
85 /* Make sure source coordinates are inside the fb. */
86 if (src_w > fb_width ||
87 src_x > fb_width - src_w ||
88 src_h > fb_height ||
89 src_y > fb_height - src_h) {
90 DRM_DEBUG_KMS("Invalid source coordinates "
91 "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
92 src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
93 src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
94 src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
95 src_y >> 16, ((src_y & 0xffff) * 15625) >> 10,
96 fb->width, fb->height);
97 return -ENOSPC;
98 }
99
100 return 0;
101}
102
103/**
104 * drm_mode_addfb - add an FB to the graphics configuration
105 * @dev: drm device for the ioctl
106 * @or: pointer to request structure
107 * @file_priv: drm file
108 *
109 * Add a new FB to the specified CRTC, given a user request. This is the
110 * original addfb ioctl which only supported RGB formats.
111 *
112 * Called by the user via ioctl, or by an in-kernel client.
113 *
114 * Returns:
115 * Zero on success, negative errno on failure.
116 */
117int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
118 struct drm_file *file_priv)
119{
120 struct drm_mode_fb_cmd2 r = {};
121 int ret;
122
123 if (!drm_core_check_feature(dev, DRIVER_MODESET))
124 return -EOPNOTSUPP;
125
126 r.pixel_format = drm_driver_legacy_fb_format(dev, or->bpp, or->depth);
127 if (r.pixel_format == DRM_FORMAT_INVALID) {
128 DRM_DEBUG("bad {bpp:%d, depth:%d}\n", or->bpp, or->depth);
129 return -EINVAL;
130 }
131
132 /* convert to new format and call new ioctl */
133 r.fb_id = or->fb_id;
134 r.width = or->width;
135 r.height = or->height;
136 r.pitches[0] = or->pitch;
137 r.handles[0] = or->handle;
138
139 ret = drm_mode_addfb2(dev, &r, file_priv);
140 if (ret)
141 return ret;
142
143 or->fb_id = r.fb_id;
144
145 return 0;
146}
147
148int drm_mode_addfb_ioctl(struct drm_device *dev,
149 void *data, struct drm_file *file_priv)
150{
151 return drm_mode_addfb(dev, data, file_priv);
152}
153
154static int fb_plane_width(int width,
155 const struct drm_format_info *format, int plane)
156{
157 if (plane == 0)
158 return width;
159
160 return DIV_ROUND_UP(width, format->hsub);
161}
162
163static int fb_plane_height(int height,
164 const struct drm_format_info *format, int plane)
165{
166 if (plane == 0)
167 return height;
168
169 return DIV_ROUND_UP(height, format->vsub);
170}
171
172static int framebuffer_check(struct drm_device *dev,
173 const struct drm_mode_fb_cmd2 *r)
174{
175 const struct drm_format_info *info;
176 int i;
177
178 /* check if the format is supported at all */
179 info = __drm_format_info(r->pixel_format);
180 if (!info) {
181 struct drm_format_name_buf format_name;
182
183 DRM_DEBUG_KMS("bad framebuffer format %s\n",
184 drm_get_format_name(r->pixel_format,
185 &format_name));
186 return -EINVAL;
187 }
188
189 /* now let the driver pick its own format info */
190 info = drm_get_format_info(dev, r);
191
192 if (r->width == 0) {
193 DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
194 return -EINVAL;
195 }
196
197 if (r->height == 0) {
198 DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
199 return -EINVAL;
200 }
201
202 for (i = 0; i < info->num_planes; i++) {
203 unsigned int width = fb_plane_width(r->width, info, i);
204 unsigned int height = fb_plane_height(r->height, info, i);
205 unsigned int block_size = info->char_per_block[i];
206 u64 min_pitch = drm_format_info_min_pitch(info, i, width);
207
208 if (!block_size && (r->modifier[i] == DRM_FORMAT_MOD_LINEAR)) {
209 DRM_DEBUG_KMS("Format requires non-linear modifier for plane %d\n", i);
210 return -EINVAL;
211 }
212
213 if (!r->handles[i]) {
214 DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
215 return -EINVAL;
216 }
217
218 if (min_pitch > UINT_MAX)
219 return -ERANGE;
220
221 if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
222 return -ERANGE;
223
224 if (block_size && r->pitches[i] < min_pitch) {
225 DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
226 return -EINVAL;
227 }
228
229 if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
230 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
231 r->modifier[i], i);
232 return -EINVAL;
233 }
234
235 if (r->flags & DRM_MODE_FB_MODIFIERS &&
236 r->modifier[i] != r->modifier[0]) {
237 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
238 r->modifier[i], i);
239 return -EINVAL;
240 }
241
242 /* modifier specific checks: */
243 switch (r->modifier[i]) {
244 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
245 /* NOTE: the pitch restriction may be lifted later if it turns
246 * out that no hw has this restriction:
247 */
248 if (r->pixel_format != DRM_FORMAT_NV12 ||
249 width % 128 || height % 32 ||
250 r->pitches[i] % 128) {
251 DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
252 return -EINVAL;
253 }
254 break;
255
256 default:
257 break;
258 }
259 }
260
261 for (i = info->num_planes; i < 4; i++) {
262 if (r->modifier[i]) {
263 DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
264 return -EINVAL;
265 }
266
267 /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
268 if (!(r->flags & DRM_MODE_FB_MODIFIERS))
269 continue;
270
271 if (r->handles[i]) {
272 DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
273 return -EINVAL;
274 }
275
276 if (r->pitches[i]) {
277 DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
278 return -EINVAL;
279 }
280
281 if (r->offsets[i]) {
282 DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
283 return -EINVAL;
284 }
285 }
286
287 return 0;
288}
289
290struct drm_framebuffer *
291drm_internal_framebuffer_create(struct drm_device *dev,
292 const struct drm_mode_fb_cmd2 *r,
293 struct drm_file *file_priv)
294{
295 struct drm_mode_config *config = &dev->mode_config;
296 struct drm_framebuffer *fb;
297 int ret;
298
299 if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
300 DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
301 return ERR_PTR(-EINVAL);
302 }
303
304 if ((config->min_width > r->width) || (r->width > config->max_width)) {
305 DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
306 r->width, config->min_width, config->max_width);
307 return ERR_PTR(-EINVAL);
308 }
309 if ((config->min_height > r->height) || (r->height > config->max_height)) {
310 DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
311 r->height, config->min_height, config->max_height);
312 return ERR_PTR(-EINVAL);
313 }
314
315 if (r->flags & DRM_MODE_FB_MODIFIERS &&
316 !dev->mode_config.allow_fb_modifiers) {
317 DRM_DEBUG_KMS("driver does not support fb modifiers\n");
318 return ERR_PTR(-EINVAL);
319 }
320
321 ret = framebuffer_check(dev, r);
322 if (ret)
323 return ERR_PTR(ret);
324
325 fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
326 if (IS_ERR(fb)) {
327 DRM_DEBUG_KMS("could not create framebuffer\n");
328 return fb;
329 }
330
331 return fb;
332}
333EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_internal_framebuffer_create);
334
335/**
336 * drm_mode_addfb2 - add an FB to the graphics configuration
337 * @dev: drm device for the ioctl
338 * @data: data pointer for the ioctl
339 * @file_priv: drm file for the ioctl call
340 *
341 * Add a new FB to the specified CRTC, given a user request with format. This is
342 * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
343 * and uses fourcc codes as pixel format specifiers.
344 *
345 * Called by the user via ioctl.
346 *
347 * Returns:
348 * Zero on success, negative errno on failure.
349 */
350int drm_mode_addfb2(struct drm_device *dev,
351 void *data, struct drm_file *file_priv)
352{
353 struct drm_mode_fb_cmd2 *r = data;
354 struct drm_framebuffer *fb;
355
356 if (!drm_core_check_feature(dev, DRIVER_MODESET))
357 return -EOPNOTSUPP;
358
359 fb = drm_internal_framebuffer_create(dev, r, file_priv);
360 if (IS_ERR(fb))
361 return PTR_ERR(fb);
362
363 DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
364 r->fb_id = fb->base.id;
365
366 /* Transfer ownership to the filp for reaping on close */
367 mutex_lock(&file_priv->fbs_lock);
368 list_add(&fb->filp_head, &file_priv->fbs);
369 mutex_unlock(&file_priv->fbs_lock);
370
371 return 0;
372}
373
374int drm_mode_addfb2_ioctl(struct drm_device *dev,
375 void *data, struct drm_file *file_priv)
376{
377#ifdef __BIG_ENDIAN
378 if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
379 /*
380 * Drivers must set the
381 * quirk_addfb_prefer_host_byte_order quirk to make
382 * the drm_mode_addfb() compat code work correctly on
383 * bigendian machines.
384 *
385 * If they don't they interpret pixel_format values
386 * incorrectly for bug compatibility, which in turn
387 * implies the ADDFB2 ioctl does not work correctly
388 * then. So block it to make userspace fallback to
389 * ADDFB.
390 */
391 DRM_DEBUG_KMS("addfb2 broken on bigendian");
392 return -EOPNOTSUPP;
393 }
394#endif
395 return drm_mode_addfb2(dev, data, file_priv);
396}
397
398struct drm_mode_rmfb_work {
399 struct work_struct work;
400 struct list_head fbs;
401};
402
403static void drm_mode_rmfb_work_fn(struct work_struct *w)
404{
405 struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
406
407 while (!list_empty(&arg->fbs)) {
408 struct drm_framebuffer *fb =
409 list_first_entry(&arg->fbs, typeof(*fb), filp_head);
410
411 list_del_init(&fb->filp_head);
412 drm_framebuffer_remove(fb);
413 }
414}
415
416/**
417 * drm_mode_rmfb - remove an FB from the configuration
418 * @dev: drm device
419 * @fb_id: id of framebuffer to remove
420 * @file_priv: drm file
421 *
422 * Remove the specified FB.
423 *
424 * Called by the user via ioctl, or by an in-kernel client.
425 *
426 * Returns:
427 * Zero on success, negative errno on failure.
428 */
429int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
430 struct drm_file *file_priv)
431{
432 struct drm_framebuffer *fb = NULL;
433 struct drm_framebuffer *fbl = NULL;
434 int found = 0;
435
436 if (!drm_core_check_feature(dev, DRIVER_MODESET))
437 return -EOPNOTSUPP;
438
439 fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
440 if (!fb)
441 return -ENOENT;
442
443 mutex_lock(&file_priv->fbs_lock);
444 list_for_each_entry(fbl, &file_priv->fbs, filp_head)
445 if (fb == fbl)
446 found = 1;
447 if (!found) {
448 mutex_unlock(&file_priv->fbs_lock);
449 goto fail_unref;
450 }
451
452 list_del_init(&fb->filp_head);
453 mutex_unlock(&file_priv->fbs_lock);
454
455 /* drop the reference we picked up in framebuffer lookup */
456 drm_framebuffer_put(fb);
457
458 /*
459 * we now own the reference that was stored in the fbs list
460 *
461 * drm_framebuffer_remove may fail with -EINTR on pending signals,
462 * so run this in a separate stack as there's no way to correctly
463 * handle this after the fb is already removed from the lookup table.
464 */
465 if (drm_framebuffer_read_refcount(fb) > 1) {
466 struct drm_mode_rmfb_work arg;
467
468 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
469 INIT_LIST_HEAD(&arg.fbs);
470 list_add_tail(&fb->filp_head, &arg.fbs);
471
472 schedule_work(&arg.work);
473 flush_work(&arg.work);
474 destroy_work_on_stack(&arg.work);
475 } else
476 drm_framebuffer_put(fb);
477
478 return 0;
479
480fail_unref:
481 drm_framebuffer_put(fb);
482 return -ENOENT;
483}
484
485int drm_mode_rmfb_ioctl(struct drm_device *dev,
486 void *data, struct drm_file *file_priv)
487{
488 uint32_t *fb_id = data;
489
490 return drm_mode_rmfb(dev, *fb_id, file_priv);
491}
492
493/**
494 * drm_mode_getfb - get FB info
495 * @dev: drm device for the ioctl
496 * @data: data pointer for the ioctl
497 * @file_priv: drm file for the ioctl call
498 *
499 * Lookup the FB given its ID and return info about it.
500 *
501 * Called by the user via ioctl.
502 *
503 * Returns:
504 * Zero on success, negative errno on failure.
505 */
506int drm_mode_getfb(struct drm_device *dev,
507 void *data, struct drm_file *file_priv)
508{
509 struct drm_mode_fb_cmd *r = data;
510 struct drm_framebuffer *fb;
511 int ret;
512
513 if (!drm_core_check_feature(dev, DRIVER_MODESET))
514 return -EOPNOTSUPP;
515
516 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
517 if (!fb)
518 return -ENOENT;
519
520 /* Multi-planar framebuffers need getfb2. */
521 if (fb->format->num_planes > 1) {
522 ret = -EINVAL;
523 goto out;
524 }
525
526 if (!fb->funcs->create_handle) {
527 ret = -ENODEV;
528 goto out;
529 }
530
531 r->height = fb->height;
532 r->width = fb->width;
533 r->depth = fb->format->depth;
534 r->bpp = fb->format->cpp[0] * 8;
535 r->pitch = fb->pitches[0];
536
537 /* GET_FB() is an unprivileged ioctl so we must not return a
538 * buffer-handle to non-master processes! For
539 * backwards-compatibility reasons, we cannot make GET_FB() privileged,
540 * so just return an invalid handle for non-masters.
541 */
542 if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
543 r->handle = 0;
544 ret = 0;
545 goto out;
546 }
547
548 ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
549
550out:
551 drm_framebuffer_put(fb);
552 return ret;
553}
554
555/**
556 * drm_mode_getfb2 - get extended FB info
557 * @dev: drm device for the ioctl
558 * @data: data pointer for the ioctl
559 * @file_priv: drm file for the ioctl call
560 *
561 * Lookup the FB given its ID and return info about it.
562 *
563 * Called by the user via ioctl.
564 *
565 * Returns:
566 * Zero on success, negative errno on failure.
567 */
568int drm_mode_getfb2_ioctl(struct drm_device *dev,
569 void *data, struct drm_file *file_priv)
570{
571 struct drm_mode_fb_cmd2 *r = data;
572 struct drm_framebuffer *fb;
573 unsigned int i;
574 int ret;
575
576 if (!drm_core_check_feature(dev, DRIVER_MODESET))
577 return -EINVAL;
578
579 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
580 if (!fb)
581 return -ENOENT;
582
583 /* For multi-plane framebuffers, we require the driver to place the
584 * GEM objects directly in the drm_framebuffer. For single-plane
585 * framebuffers, we can fall back to create_handle.
586 */
587 if (!fb->obj[0] &&
588 (fb->format->num_planes > 1 || !fb->funcs->create_handle)) {
589 ret = -ENODEV;
590 goto out;
591 }
592
593 r->height = fb->height;
594 r->width = fb->width;
595 r->pixel_format = fb->format->format;
596
597 r->flags = 0;
598 if (dev->mode_config.allow_fb_modifiers)
599 r->flags |= DRM_MODE_FB_MODIFIERS;
600
601 for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
602 r->handles[i] = 0;
603 r->pitches[i] = 0;
604 r->offsets[i] = 0;
605 r->modifier[i] = 0;
606 }
607
608 for (i = 0; i < fb->format->num_planes; i++) {
609 r->pitches[i] = fb->pitches[i];
610 r->offsets[i] = fb->offsets[i];
611 if (dev->mode_config.allow_fb_modifiers)
612 r->modifier[i] = fb->modifier;
613 }
614
615 /* GET_FB2() is an unprivileged ioctl so we must not return a
616 * buffer-handle to non master/root processes! To match GET_FB()
617 * just return invalid handles (0) for non masters/root
618 * rather than making GET_FB2() privileged.
619 */
620 if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
621 ret = 0;
622 goto out;
623 }
624
625 for (i = 0; i < fb->format->num_planes; i++) {
626 int j;
627
628 /* If we reuse the same object for multiple planes, also
629 * return the same handle.
630 */
631 for (j = 0; j < i; j++) {
632 if (fb->obj[i] == fb->obj[j]) {
633 r->handles[i] = r->handles[j];
634 break;
635 }
636 }
637
638 if (r->handles[i])
639 continue;
640
641 if (fb->obj[i]) {
642 ret = drm_gem_handle_create(file_priv, fb->obj[i],
643 &r->handles[i]);
644 } else {
645 WARN_ON(i > 0);
646 ret = fb->funcs->create_handle(fb, file_priv,
647 &r->handles[i]);
648 }
649
650 if (ret != 0)
651 goto out;
652 }
653
654out:
655 if (ret != 0) {
656 /* Delete any previously-created handles on failure. */
657 for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
658 int j;
659
660 if (r->handles[i])
661 drm_gem_handle_delete(file_priv, r->handles[i]);
662
663 /* Zero out any handles identical to the one we just
664 * deleted.
665 */
666 for (j = i + 1; j < ARRAY_SIZE(r->handles); j++) {
667 if (r->handles[j] == r->handles[i])
668 r->handles[j] = 0;
669 }
670 }
671 }
672
673 drm_framebuffer_put(fb);
674 return ret;
675}
676
677/**
678 * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
679 * @dev: drm device for the ioctl
680 * @data: data pointer for the ioctl
681 * @file_priv: drm file for the ioctl call
682 *
683 * Lookup the FB and flush out the damaged area supplied by userspace as a clip
684 * rectangle list. Generic userspace which does frontbuffer rendering must call
685 * this ioctl to flush out the changes on manual-update display outputs, e.g.
686 * usb display-link, mipi manual update panels or edp panel self refresh modes.
687 *
688 * Modesetting drivers which always update the frontbuffer do not need to
689 * implement the corresponding &drm_framebuffer_funcs.dirty callback.
690 *
691 * Called by the user via ioctl.
692 *
693 * Returns:
694 * Zero on success, negative errno on failure.
695 */
696int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
697 void *data, struct drm_file *file_priv)
698{
699 struct drm_clip_rect __user *clips_ptr;
700 struct drm_clip_rect *clips = NULL;
701 struct drm_mode_fb_dirty_cmd *r = data;
702 struct drm_framebuffer *fb;
703 unsigned flags;
704 int num_clips;
705 int ret;
706
707 if (!drm_core_check_feature(dev, DRIVER_MODESET))
708 return -EOPNOTSUPP;
709
710 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
711 if (!fb)
712 return -ENOENT;
713
714 num_clips = r->num_clips;
715 clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
716
717 if (!num_clips != !clips_ptr) {
718 ret = -EINVAL;
719 goto out_err1;
720 }
721
722 flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
723
724 /* If userspace annotates copy, clips must come in pairs */
725 if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
726 ret = -EINVAL;
727 goto out_err1;
728 }
729
730 if (num_clips && clips_ptr) {
731 if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
732 ret = -EINVAL;
733 goto out_err1;
734 }
735 clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
736 if (!clips) {
737 ret = -ENOMEM;
738 goto out_err1;
739 }
740
741 ret = copy_from_user(clips, clips_ptr,
742 num_clips * sizeof(*clips));
743 if (ret) {
744 ret = -EFAULT;
745 goto out_err2;
746 }
747 }
748
749 if (fb->funcs->dirty) {
750 ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
751 clips, num_clips);
752 } else {
753 ret = -ENOSYS;
754 }
755
756out_err2:
757 kfree(clips);
758out_err1:
759 drm_framebuffer_put(fb);
760
761 return ret;
762}
763
764/**
765 * drm_fb_release - remove and free the FBs on this file
766 * @priv: drm file for the ioctl
767 *
768 * Destroy all the FBs associated with @filp.
769 *
770 * Called by the user via ioctl.
771 *
772 * Returns:
773 * Zero on success, negative errno on failure.
774 */
775void drm_fb_release(struct drm_file *priv)
776{
777 struct drm_framebuffer *fb, *tfb;
778 struct drm_mode_rmfb_work arg;
779
780 INIT_LIST_HEAD(&arg.fbs);
781
782 /*
783 * When the file gets released that means no one else can access the fb
784 * list any more, so no need to grab fpriv->fbs_lock. And we need to
785 * avoid upsetting lockdep since the universal cursor code adds a
786 * framebuffer while holding mutex locks.
787 *
788 * Note that a real deadlock between fpriv->fbs_lock and the modeset
789 * locks is impossible here since no one else but this function can get
790 * at it any more.
791 */
792 list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
793 if (drm_framebuffer_read_refcount(fb) > 1) {
794 list_move_tail(&fb->filp_head, &arg.fbs);
795 } else {
796 list_del_init(&fb->filp_head);
797
798 /* This drops the fpriv->fbs reference. */
799 drm_framebuffer_put(fb);
800 }
801 }
802
803 if (!list_empty(&arg.fbs)) {
804 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
805
806 schedule_work(&arg.work);
807 flush_work(&arg.work);
808 destroy_work_on_stack(&arg.work);
809 }
810}
811
812void drm_framebuffer_free(struct kref *kref)
813{
814 struct drm_framebuffer *fb =
815 container_of(kref, struct drm_framebuffer, base.refcount);
816 struct drm_device *dev = fb->dev;
817
818 /*
819 * The lookup idr holds a weak reference, which has not necessarily been
820 * removed at this point. Check for that.
821 */
822 drm_mode_object_unregister(dev, &fb->base);
823
824 fb->funcs->destroy(fb);
825}
826
827/**
828 * drm_framebuffer_init - initialize a framebuffer
829 * @dev: DRM device
830 * @fb: framebuffer to be initialized
831 * @funcs: ... with these functions
832 *
833 * Allocates an ID for the framebuffer's parent mode object, sets its mode
834 * functions & device file and adds it to the master fd list.
835 *
836 * IMPORTANT:
837 * This functions publishes the fb and makes it available for concurrent access
838 * by other users. Which means by this point the fb _must_ be fully set up -
839 * since all the fb attributes are invariant over its lifetime, no further
840 * locking but only correct reference counting is required.
841 *
842 * Returns:
843 * Zero on success, error code on failure.
844 */
845int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
846 const struct drm_framebuffer_funcs *funcs)
847{
848 int ret;
849
850 if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
851 return -EINVAL;
852
853 INIT_LIST_HEAD(&fb->filp_head);
854
855 fb->funcs = funcs;
856 strcpy(fb->comm, current->comm);
857
858 ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
859 false, drm_framebuffer_free);
860 if (ret)
861 goto out;
862
863 mutex_lock(&dev->mode_config.fb_lock);
864 dev->mode_config.num_fb++;
865 list_add(&fb->head, &dev->mode_config.fb_list);
866 mutex_unlock(&dev->mode_config.fb_lock);
867
868 drm_mode_object_register(dev, &fb->base);
869out:
870 return ret;
871}
872EXPORT_SYMBOL(drm_framebuffer_init);
873
874/**
875 * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
876 * @dev: drm device
877 * @file_priv: drm file to check for lease against.
878 * @id: id of the fb object
879 *
880 * If successful, this grabs an additional reference to the framebuffer -
881 * callers need to make sure to eventually unreference the returned framebuffer
882 * again, using drm_framebuffer_put().
883 */
884struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
885 struct drm_file *file_priv,
886 uint32_t id)
887{
888 struct drm_mode_object *obj;
889 struct drm_framebuffer *fb = NULL;
890
891 obj = __drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_FB);
892 if (obj)
893 fb = obj_to_fb(obj);
894 return fb;
895}
896EXPORT_SYMBOL(drm_framebuffer_lookup);
897
898/**
899 * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
900 * @fb: fb to unregister
901 *
902 * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
903 * those used for fbdev. Note that the caller must hold a reference of its own,
904 * i.e. the object may not be destroyed through this call (since it'll lead to a
905 * locking inversion).
906 *
907 * NOTE: This function is deprecated. For driver-private framebuffers it is not
908 * recommended to embed a framebuffer struct info fbdev struct, instead, a
909 * framebuffer pointer is preferred and drm_framebuffer_put() should be called
910 * when the framebuffer is to be cleaned up.
911 */
912void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
913{
914 struct drm_device *dev;
915
916 if (!fb)
917 return;
918
919 dev = fb->dev;
920
921 /* Mark fb as reaped and drop idr ref. */
922 drm_mode_object_unregister(dev, &fb->base);
923}
924EXPORT_SYMBOL(drm_framebuffer_unregister_private);
925
926/**
927 * drm_framebuffer_cleanup - remove a framebuffer object
928 * @fb: framebuffer to remove
929 *
930 * Cleanup framebuffer. This function is intended to be used from the drivers
931 * &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
932 * driver private framebuffers embedded into a larger structure.
933 *
934 * Note that this function does not remove the fb from active usage - if it is
935 * still used anywhere, hilarity can ensue since userspace could call getfb on
936 * the id and get back -EINVAL. Obviously no concern at driver unload time.
937 *
938 * Also, the framebuffer will not be removed from the lookup idr - for
939 * user-created framebuffers this will happen in in the rmfb ioctl. For
940 * driver-private objects (e.g. for fbdev) drivers need to explicitly call
941 * drm_framebuffer_unregister_private.
942 */
943void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
944{
945 struct drm_device *dev = fb->dev;
946
947 mutex_lock(&dev->mode_config.fb_lock);
948 list_del(&fb->head);
949 dev->mode_config.num_fb--;
950 mutex_unlock(&dev->mode_config.fb_lock);
951}
952EXPORT_SYMBOL(drm_framebuffer_cleanup);
953
954static int atomic_remove_fb(struct drm_framebuffer *fb)
955{
956 struct drm_modeset_acquire_ctx ctx;
957 struct drm_device *dev = fb->dev;
958 struct drm_atomic_state *state;
959 struct drm_plane *plane;
960 struct drm_connector *conn __maybe_unused;
961 struct drm_connector_state *conn_state;
962 int i, ret;
963 unsigned plane_mask;
964 bool disable_crtcs = false;
965
966retry_disable:
967 drm_modeset_acquire_init(&ctx, 0);
968
969 state = drm_atomic_state_alloc(dev);
970 if (!state) {
971 ret = -ENOMEM;
972 goto out;
973 }
974 state->acquire_ctx = &ctx;
975
976retry:
977 plane_mask = 0;
978 ret = drm_modeset_lock_all_ctx(dev, &ctx);
979 if (ret)
980 goto unlock;
981
982 drm_for_each_plane(plane, dev) {
983 struct drm_plane_state *plane_state;
984
985 if (plane->state->fb != fb)
986 continue;
987
988 plane_state = drm_atomic_get_plane_state(state, plane);
989 if (IS_ERR(plane_state)) {
990 ret = PTR_ERR(plane_state);
991 goto unlock;
992 }
993
994 if (disable_crtcs && plane_state->crtc->primary == plane) {
995 struct drm_crtc_state *crtc_state;
996
997 crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
998
999 ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
1000 if (ret)
1001 goto unlock;
1002
1003 crtc_state->active = false;
1004 ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1005 if (ret)
1006 goto unlock;
1007 }
1008
1009 drm_atomic_set_fb_for_plane(plane_state, NULL);
1010 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1011 if (ret)
1012 goto unlock;
1013
1014 plane_mask |= drm_plane_mask(plane);
1015 }
1016
1017 /* This list is only filled when disable_crtcs is set. */
1018 for_each_new_connector_in_state(state, conn, conn_state, i) {
1019 ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
1020
1021 if (ret)
1022 goto unlock;
1023 }
1024
1025 if (plane_mask)
1026 ret = drm_atomic_commit(state);
1027
1028unlock:
1029 if (ret == -EDEADLK) {
1030 drm_atomic_state_clear(state);
1031 drm_modeset_backoff(&ctx);
1032 goto retry;
1033 }
1034
1035 drm_atomic_state_put(state);
1036
1037out:
1038 drm_modeset_drop_locks(&ctx);
1039 drm_modeset_acquire_fini(&ctx);
1040
1041 if (ret == -EINVAL && !disable_crtcs) {
1042 disable_crtcs = true;
1043 goto retry_disable;
1044 }
1045
1046 return ret;
1047}
1048
1049static void legacy_remove_fb(struct drm_framebuffer *fb)
1050{
1051 struct drm_device *dev = fb->dev;
1052 struct drm_crtc *crtc;
1053 struct drm_plane *plane;
1054
1055 drm_modeset_lock_all(dev);
1056 /* remove from any CRTC */
1057 drm_for_each_crtc(crtc, dev) {
1058 if (crtc->primary->fb == fb) {
1059 /* should turn off the crtc */
1060 if (drm_crtc_force_disable(crtc))
1061 DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
1062 }
1063 }
1064
1065 drm_for_each_plane(plane, dev) {
1066 if (plane->fb == fb)
1067 drm_plane_force_disable(plane);
1068 }
1069 drm_modeset_unlock_all(dev);
1070}
1071
1072/**
1073 * drm_framebuffer_remove - remove and unreference a framebuffer object
1074 * @fb: framebuffer to remove
1075 *
1076 * Scans all the CRTCs and planes in @dev's mode_config. If they're
1077 * using @fb, removes it, setting it to NULL. Then drops the reference to the
1078 * passed-in framebuffer. Might take the modeset locks.
1079 *
1080 * Note that this function optimizes the cleanup away if the caller holds the
1081 * last reference to the framebuffer. It is also guaranteed to not take the
1082 * modeset locks in this case.
1083 */
1084void drm_framebuffer_remove(struct drm_framebuffer *fb)
1085{
1086 struct drm_device *dev;
1087
1088 if (!fb)
1089 return;
1090
1091 dev = fb->dev;
1092
1093 WARN_ON(!list_empty(&fb->filp_head));
1094
1095 /*
1096 * drm ABI mandates that we remove any deleted framebuffers from active
1097 * useage. But since most sane clients only remove framebuffers they no
1098 * longer need, try to optimize this away.
1099 *
1100 * Since we're holding a reference ourselves, observing a refcount of 1
1101 * means that we're the last holder and can skip it. Also, the refcount
1102 * can never increase from 1 again, so we don't need any barriers or
1103 * locks.
1104 *
1105 * Note that userspace could try to race with use and instate a new
1106 * usage _after_ we've cleared all current ones. End result will be an
1107 * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
1108 * in this manner.
1109 */
1110 if (drm_framebuffer_read_refcount(fb) > 1) {
1111 if (drm_drv_uses_atomic_modeset(dev)) {
1112 int ret = atomic_remove_fb(fb);
1113
1114 WARN(ret, "atomic remove_fb failed with %i\n", ret);
1115 } else
1116 legacy_remove_fb(fb);
1117 }
1118
1119 drm_framebuffer_put(fb);
1120}
1121EXPORT_SYMBOL(drm_framebuffer_remove);
1122
1123/**
1124 * drm_framebuffer_plane_width - width of the plane given the first plane
1125 * @width: width of the first plane
1126 * @fb: the framebuffer
1127 * @plane: plane index
1128 *
1129 * Returns:
1130 * The width of @plane, given that the width of the first plane is @width.
1131 */
1132int drm_framebuffer_plane_width(int width,
1133 const struct drm_framebuffer *fb, int plane)
1134{
1135 if (plane >= fb->format->num_planes)
1136 return 0;
1137
1138 return fb_plane_width(width, fb->format, plane);
1139}
1140EXPORT_SYMBOL(drm_framebuffer_plane_width);
1141
1142/**
1143 * drm_framebuffer_plane_height - height of the plane given the first plane
1144 * @height: height of the first plane
1145 * @fb: the framebuffer
1146 * @plane: plane index
1147 *
1148 * Returns:
1149 * The height of @plane, given that the height of the first plane is @height.
1150 */
1151int drm_framebuffer_plane_height(int height,
1152 const struct drm_framebuffer *fb, int plane)
1153{
1154 if (plane >= fb->format->num_planes)
1155 return 0;
1156
1157 return fb_plane_height(height, fb->format, plane);
1158}
1159EXPORT_SYMBOL(drm_framebuffer_plane_height);
1160
1161void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
1162 const struct drm_framebuffer *fb)
1163{
1164 struct drm_format_name_buf format_name;
1165 unsigned int i;
1166
1167 drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
1168 drm_printf_indent(p, indent, "refcount=%u\n",
1169 drm_framebuffer_read_refcount(fb));
1170 drm_printf_indent(p, indent, "format=%s\n",
1171 drm_get_format_name(fb->format->format, &format_name));
1172 drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
1173 drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
1174 drm_printf_indent(p, indent, "layers:\n");
1175
1176 for (i = 0; i < fb->format->num_planes; i++) {
1177 drm_printf_indent(p, indent + 1, "size[%u]=%dx%d\n", i,
1178 drm_framebuffer_plane_width(fb->width, fb, i),
1179 drm_framebuffer_plane_height(fb->height, fb, i));
1180 drm_printf_indent(p, indent + 1, "pitch[%u]=%u\n", i, fb->pitches[i]);
1181 drm_printf_indent(p, indent + 1, "offset[%u]=%u\n", i, fb->offsets[i]);
1182 drm_printf_indent(p, indent + 1, "obj[%u]:%s\n", i,
1183 fb->obj[i] ? "" : "(null)");
1184 if (fb->obj[i])
1185 drm_gem_print_info(p, indent + 2, fb->obj[i]);
1186 }
1187}
1188
1189#ifdef CONFIG_DEBUG_FS
1190static int drm_framebuffer_info(struct seq_file *m, void *data)
1191{
1192 struct drm_info_node *node = m->private;
1193 struct drm_device *dev = node->minor->dev;
1194 struct drm_printer p = drm_seq_file_printer(m);
1195 struct drm_framebuffer *fb;
1196
1197 mutex_lock(&dev->mode_config.fb_lock);
1198 drm_for_each_fb(fb, dev) {
1199 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
1200 drm_framebuffer_print_info(&p, 1, fb);
1201 }
1202 mutex_unlock(&dev->mode_config.fb_lock);
1203
1204 return 0;
1205}
1206
1207static const struct drm_info_list drm_framebuffer_debugfs_list[] = {
1208 { "framebuffer", drm_framebuffer_info, 0 },
1209};
1210
1211void drm_framebuffer_debugfs_init(struct drm_minor *minor)
1212{
1213 drm_debugfs_create_files(drm_framebuffer_debugfs_list,
1214 ARRAY_SIZE(drm_framebuffer_debugfs_list),
1215 minor->debugfs_root, minor);
1216}
1217#endif
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 <linux/uaccess.h>
25
26#include <drm/drm_atomic.h>
27#include <drm/drm_atomic_uapi.h>
28#include <drm/drm_auth.h>
29#include <drm/drm_debugfs.h>
30#include <drm/drm_drv.h>
31#include <drm/drm_file.h>
32#include <drm/drm_fourcc.h>
33#include <drm/drm_framebuffer.h>
34#include <drm/drm_gem.h>
35#include <drm/drm_print.h>
36#include <drm/drm_util.h>
37
38#include "drm_crtc_internal.h"
39#include "drm_internal.h"
40
41/**
42 * DOC: overview
43 *
44 * Frame buffers are abstract memory objects that provide a source of pixels to
45 * scanout to a CRTC. Applications explicitly request the creation of frame
46 * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
47 * handle that can be passed to the KMS CRTC control, plane configuration and
48 * page flip functions.
49 *
50 * Frame buffers rely on the underlying memory manager for allocating backing
51 * storage. When creating a frame buffer applications pass a memory handle
52 * (or a list of memory handles for multi-planar formats) through the
53 * &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
54 * buffer management interface this would be a GEM handle. Drivers are however
55 * free to use their own backing storage object handles, e.g. vmwgfx directly
56 * exposes special TTM handles to userspace and so expects TTM handles in the
57 * create ioctl and not GEM handles.
58 *
59 * Framebuffers are tracked with &struct drm_framebuffer. They are published
60 * using drm_framebuffer_init() - after calling that function userspace can use
61 * and access the framebuffer object. The helper function
62 * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
63 * metadata fields.
64 *
65 * The lifetime of a drm framebuffer is controlled with a reference count,
66 * drivers can grab additional references with drm_framebuffer_get() and drop
67 * them again with drm_framebuffer_put(). For driver-private framebuffers for
68 * which the last reference is never dropped (e.g. for the fbdev framebuffer
69 * when the struct &struct drm_framebuffer is embedded into the fbdev helper
70 * struct) drivers can manually clean up a framebuffer at module unload time
71 * with drm_framebuffer_unregister_private(). But doing this is not
72 * recommended, and it's better to have a normal free-standing &struct
73 * drm_framebuffer.
74 */
75
76int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
77 uint32_t src_w, uint32_t src_h,
78 const struct drm_framebuffer *fb)
79{
80 unsigned int fb_width, fb_height;
81
82 fb_width = fb->width << 16;
83 fb_height = fb->height << 16;
84
85 /* Make sure source coordinates are inside the fb. */
86 if (src_w > fb_width ||
87 src_x > fb_width - src_w ||
88 src_h > fb_height ||
89 src_y > fb_height - src_h) {
90 drm_dbg_kms(fb->dev, "Invalid source coordinates "
91 "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
92 src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
93 src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
94 src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
95 src_y >> 16, ((src_y & 0xffff) * 15625) >> 10,
96 fb->width, fb->height);
97 return -ENOSPC;
98 }
99
100 return 0;
101}
102
103/**
104 * drm_mode_addfb - add an FB to the graphics configuration
105 * @dev: drm device for the ioctl
106 * @or: pointer to request structure
107 * @file_priv: drm file
108 *
109 * Add a new FB to the specified CRTC, given a user request. This is the
110 * original addfb ioctl which only supported RGB formats.
111 *
112 * Called by the user via ioctl, or by an in-kernel client.
113 *
114 * Returns:
115 * Zero on success, negative errno on failure.
116 */
117int drm_mode_addfb(struct drm_device *dev, struct drm_mode_fb_cmd *or,
118 struct drm_file *file_priv)
119{
120 struct drm_mode_fb_cmd2 r = {};
121 int ret;
122
123 if (!drm_core_check_feature(dev, DRIVER_MODESET))
124 return -EOPNOTSUPP;
125
126 r.pixel_format = drm_driver_legacy_fb_format(dev, or->bpp, or->depth);
127 if (r.pixel_format == DRM_FORMAT_INVALID) {
128 drm_dbg_kms(dev, "bad {bpp:%d, depth:%d}\n", or->bpp, or->depth);
129 return -EINVAL;
130 }
131
132 /* convert to new format and call new ioctl */
133 r.fb_id = or->fb_id;
134 r.width = or->width;
135 r.height = or->height;
136 r.pitches[0] = or->pitch;
137 r.handles[0] = or->handle;
138
139 ret = drm_mode_addfb2(dev, &r, file_priv);
140 if (ret)
141 return ret;
142
143 or->fb_id = r.fb_id;
144
145 return 0;
146}
147
148int drm_mode_addfb_ioctl(struct drm_device *dev,
149 void *data, struct drm_file *file_priv)
150{
151 return drm_mode_addfb(dev, data, file_priv);
152}
153
154static int fb_plane_width(int width,
155 const struct drm_format_info *format, int plane)
156{
157 if (plane == 0)
158 return width;
159
160 return DIV_ROUND_UP(width, format->hsub);
161}
162
163static int fb_plane_height(int height,
164 const struct drm_format_info *format, int plane)
165{
166 if (plane == 0)
167 return height;
168
169 return DIV_ROUND_UP(height, format->vsub);
170}
171
172static int framebuffer_check(struct drm_device *dev,
173 const struct drm_mode_fb_cmd2 *r)
174{
175 const struct drm_format_info *info;
176 int i;
177
178 /* check if the format is supported at all */
179 if (!__drm_format_info(r->pixel_format)) {
180 drm_dbg_kms(dev, "bad framebuffer format %p4cc\n",
181 &r->pixel_format);
182 return -EINVAL;
183 }
184
185 if (r->width == 0) {
186 drm_dbg_kms(dev, "bad framebuffer width %u\n", r->width);
187 return -EINVAL;
188 }
189
190 if (r->height == 0) {
191 drm_dbg_kms(dev, "bad framebuffer height %u\n", r->height);
192 return -EINVAL;
193 }
194
195 /* now let the driver pick its own format info */
196 info = drm_get_format_info(dev, r);
197
198 for (i = 0; i < info->num_planes; i++) {
199 unsigned int width = fb_plane_width(r->width, info, i);
200 unsigned int height = fb_plane_height(r->height, info, i);
201 unsigned int block_size = info->char_per_block[i];
202 u64 min_pitch = drm_format_info_min_pitch(info, i, width);
203
204 if (!block_size && (r->modifier[i] == DRM_FORMAT_MOD_LINEAR)) {
205 drm_dbg_kms(dev, "Format requires non-linear modifier for plane %d\n", i);
206 return -EINVAL;
207 }
208
209 if (!r->handles[i]) {
210 drm_dbg_kms(dev, "no buffer object handle for plane %d\n", i);
211 return -EINVAL;
212 }
213
214 if (min_pitch > UINT_MAX)
215 return -ERANGE;
216
217 if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
218 return -ERANGE;
219
220 if (block_size && r->pitches[i] < min_pitch) {
221 drm_dbg_kms(dev, "bad pitch %u for plane %d\n", r->pitches[i], i);
222 return -EINVAL;
223 }
224
225 if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
226 drm_dbg_kms(dev, "bad fb modifier %llu for plane %d\n",
227 r->modifier[i], i);
228 return -EINVAL;
229 }
230
231 if (r->flags & DRM_MODE_FB_MODIFIERS &&
232 r->modifier[i] != r->modifier[0]) {
233 drm_dbg_kms(dev, "bad fb modifier %llu for plane %d\n",
234 r->modifier[i], i);
235 return -EINVAL;
236 }
237
238 /* modifier specific checks: */
239 switch (r->modifier[i]) {
240 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
241 /* NOTE: the pitch restriction may be lifted later if it turns
242 * out that no hw has this restriction:
243 */
244 if (r->pixel_format != DRM_FORMAT_NV12 ||
245 width % 128 || height % 32 ||
246 r->pitches[i] % 128) {
247 drm_dbg_kms(dev, "bad modifier data for plane %d\n", i);
248 return -EINVAL;
249 }
250 break;
251
252 default:
253 break;
254 }
255 }
256
257 for (i = info->num_planes; i < 4; i++) {
258 if (r->modifier[i]) {
259 drm_dbg_kms(dev, "non-zero modifier for unused plane %d\n", i);
260 return -EINVAL;
261 }
262
263 /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
264 if (!(r->flags & DRM_MODE_FB_MODIFIERS))
265 continue;
266
267 if (r->handles[i]) {
268 drm_dbg_kms(dev, "buffer object handle for unused plane %d\n", i);
269 return -EINVAL;
270 }
271
272 if (r->pitches[i]) {
273 drm_dbg_kms(dev, "non-zero pitch for unused plane %d\n", i);
274 return -EINVAL;
275 }
276
277 if (r->offsets[i]) {
278 drm_dbg_kms(dev, "non-zero offset for unused plane %d\n", i);
279 return -EINVAL;
280 }
281 }
282
283 return 0;
284}
285
286struct drm_framebuffer *
287drm_internal_framebuffer_create(struct drm_device *dev,
288 const struct drm_mode_fb_cmd2 *r,
289 struct drm_file *file_priv)
290{
291 struct drm_mode_config *config = &dev->mode_config;
292 struct drm_framebuffer *fb;
293 int ret;
294
295 if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
296 drm_dbg_kms(dev, "bad framebuffer flags 0x%08x\n", r->flags);
297 return ERR_PTR(-EINVAL);
298 }
299
300 if ((config->min_width > r->width) || (r->width > config->max_width)) {
301 drm_dbg_kms(dev, "bad framebuffer width %d, should be >= %d && <= %d\n",
302 r->width, config->min_width, config->max_width);
303 return ERR_PTR(-EINVAL);
304 }
305 if ((config->min_height > r->height) || (r->height > config->max_height)) {
306 drm_dbg_kms(dev, "bad framebuffer height %d, should be >= %d && <= %d\n",
307 r->height, config->min_height, config->max_height);
308 return ERR_PTR(-EINVAL);
309 }
310
311 if (r->flags & DRM_MODE_FB_MODIFIERS &&
312 dev->mode_config.fb_modifiers_not_supported) {
313 drm_dbg_kms(dev, "driver does not support fb modifiers\n");
314 return ERR_PTR(-EINVAL);
315 }
316
317 ret = framebuffer_check(dev, r);
318 if (ret)
319 return ERR_PTR(ret);
320
321 fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
322 if (IS_ERR(fb)) {
323 drm_dbg_kms(dev, "could not create framebuffer\n");
324 return fb;
325 }
326
327 return fb;
328}
329EXPORT_SYMBOL_FOR_TESTS_ONLY(drm_internal_framebuffer_create);
330
331/**
332 * drm_mode_addfb2 - add an FB to the graphics configuration
333 * @dev: drm device for the ioctl
334 * @data: data pointer for the ioctl
335 * @file_priv: drm file for the ioctl call
336 *
337 * Add a new FB to the specified CRTC, given a user request with format. This is
338 * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
339 * and uses fourcc codes as pixel format specifiers.
340 *
341 * Called by the user via ioctl.
342 *
343 * Returns:
344 * Zero on success, negative errno on failure.
345 */
346int drm_mode_addfb2(struct drm_device *dev,
347 void *data, struct drm_file *file_priv)
348{
349 struct drm_mode_fb_cmd2 *r = data;
350 struct drm_framebuffer *fb;
351
352 if (!drm_core_check_feature(dev, DRIVER_MODESET))
353 return -EOPNOTSUPP;
354
355 fb = drm_internal_framebuffer_create(dev, r, file_priv);
356 if (IS_ERR(fb))
357 return PTR_ERR(fb);
358
359 drm_dbg_kms(dev, "[FB:%d]\n", fb->base.id);
360 r->fb_id = fb->base.id;
361
362 /* Transfer ownership to the filp for reaping on close */
363 mutex_lock(&file_priv->fbs_lock);
364 list_add(&fb->filp_head, &file_priv->fbs);
365 mutex_unlock(&file_priv->fbs_lock);
366
367 return 0;
368}
369
370int drm_mode_addfb2_ioctl(struct drm_device *dev,
371 void *data, struct drm_file *file_priv)
372{
373#ifdef __BIG_ENDIAN
374 if (!dev->mode_config.quirk_addfb_prefer_host_byte_order) {
375 /*
376 * Drivers must set the
377 * quirk_addfb_prefer_host_byte_order quirk to make
378 * the drm_mode_addfb() compat code work correctly on
379 * bigendian machines.
380 *
381 * If they don't they interpret pixel_format values
382 * incorrectly for bug compatibility, which in turn
383 * implies the ADDFB2 ioctl does not work correctly
384 * then. So block it to make userspace fallback to
385 * ADDFB.
386 */
387 drm_dbg_kms(dev, "addfb2 broken on bigendian");
388 return -EOPNOTSUPP;
389 }
390#endif
391 return drm_mode_addfb2(dev, data, file_priv);
392}
393
394struct drm_mode_rmfb_work {
395 struct work_struct work;
396 struct list_head fbs;
397};
398
399static void drm_mode_rmfb_work_fn(struct work_struct *w)
400{
401 struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
402
403 while (!list_empty(&arg->fbs)) {
404 struct drm_framebuffer *fb =
405 list_first_entry(&arg->fbs, typeof(*fb), filp_head);
406
407 drm_dbg_kms(fb->dev,
408 "Removing [FB:%d] from all active usage due to RMFB ioctl\n",
409 fb->base.id);
410 list_del_init(&fb->filp_head);
411 drm_framebuffer_remove(fb);
412 }
413}
414
415/**
416 * drm_mode_rmfb - remove an FB from the configuration
417 * @dev: drm device
418 * @fb_id: id of framebuffer to remove
419 * @file_priv: drm file
420 *
421 * Remove the specified FB.
422 *
423 * Called by the user via ioctl, or by an in-kernel client.
424 *
425 * Returns:
426 * Zero on success, negative errno on failure.
427 */
428int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
429 struct drm_file *file_priv)
430{
431 struct drm_framebuffer *fb = NULL;
432 struct drm_framebuffer *fbl = NULL;
433 int found = 0;
434
435 if (!drm_core_check_feature(dev, DRIVER_MODESET))
436 return -EOPNOTSUPP;
437
438 fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
439 if (!fb)
440 return -ENOENT;
441
442 mutex_lock(&file_priv->fbs_lock);
443 list_for_each_entry(fbl, &file_priv->fbs, filp_head)
444 if (fb == fbl)
445 found = 1;
446 if (!found) {
447 mutex_unlock(&file_priv->fbs_lock);
448 goto fail_unref;
449 }
450
451 list_del_init(&fb->filp_head);
452 mutex_unlock(&file_priv->fbs_lock);
453
454 /* drop the reference we picked up in framebuffer lookup */
455 drm_framebuffer_put(fb);
456
457 /*
458 * we now own the reference that was stored in the fbs list
459 *
460 * drm_framebuffer_remove may fail with -EINTR on pending signals,
461 * so run this in a separate stack as there's no way to correctly
462 * handle this after the fb is already removed from the lookup table.
463 */
464 if (drm_framebuffer_read_refcount(fb) > 1) {
465 struct drm_mode_rmfb_work arg;
466
467 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
468 INIT_LIST_HEAD(&arg.fbs);
469 list_add_tail(&fb->filp_head, &arg.fbs);
470
471 schedule_work(&arg.work);
472 flush_work(&arg.work);
473 destroy_work_on_stack(&arg.work);
474 } else
475 drm_framebuffer_put(fb);
476
477 return 0;
478
479fail_unref:
480 drm_framebuffer_put(fb);
481 return -ENOENT;
482}
483
484int drm_mode_rmfb_ioctl(struct drm_device *dev,
485 void *data, struct drm_file *file_priv)
486{
487 uint32_t *fb_id = data;
488
489 return drm_mode_rmfb(dev, *fb_id, file_priv);
490}
491
492/**
493 * drm_mode_getfb - get FB info
494 * @dev: drm device for the ioctl
495 * @data: data pointer for the ioctl
496 * @file_priv: drm file for the ioctl call
497 *
498 * Lookup the FB given its ID and return info about it.
499 *
500 * Called by the user via ioctl.
501 *
502 * Returns:
503 * Zero on success, negative errno on failure.
504 */
505int drm_mode_getfb(struct drm_device *dev,
506 void *data, struct drm_file *file_priv)
507{
508 struct drm_mode_fb_cmd *r = data;
509 struct drm_framebuffer *fb;
510 int ret;
511
512 if (!drm_core_check_feature(dev, DRIVER_MODESET))
513 return -EOPNOTSUPP;
514
515 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
516 if (!fb)
517 return -ENOENT;
518
519 /* Multi-planar framebuffers need getfb2. */
520 if (fb->format->num_planes > 1) {
521 ret = -EINVAL;
522 goto out;
523 }
524
525 if (!fb->funcs->create_handle) {
526 ret = -ENODEV;
527 goto out;
528 }
529
530 r->height = fb->height;
531 r->width = fb->width;
532 r->depth = fb->format->depth;
533 r->bpp = drm_format_info_bpp(fb->format, 0);
534 r->pitch = fb->pitches[0];
535
536 /* GET_FB() is an unprivileged ioctl so we must not return a
537 * buffer-handle to non-master processes! For
538 * backwards-compatibility reasons, we cannot make GET_FB() privileged,
539 * so just return an invalid handle for non-masters.
540 */
541 if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
542 r->handle = 0;
543 ret = 0;
544 goto out;
545 }
546
547 ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
548
549out:
550 drm_framebuffer_put(fb);
551 return ret;
552}
553
554/**
555 * drm_mode_getfb2_ioctl - get extended FB info
556 * @dev: drm device for the ioctl
557 * @data: data pointer for the ioctl
558 * @file_priv: drm file for the ioctl call
559 *
560 * Lookup the FB given its ID and return info about it.
561 *
562 * Called by the user via ioctl.
563 *
564 * Returns:
565 * Zero on success, negative errno on failure.
566 */
567int drm_mode_getfb2_ioctl(struct drm_device *dev,
568 void *data, struct drm_file *file_priv)
569{
570 struct drm_mode_fb_cmd2 *r = data;
571 struct drm_framebuffer *fb;
572 unsigned int i;
573 int ret;
574
575 if (!drm_core_check_feature(dev, DRIVER_MODESET))
576 return -EINVAL;
577
578 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
579 if (!fb)
580 return -ENOENT;
581
582 /* For multi-plane framebuffers, we require the driver to place the
583 * GEM objects directly in the drm_framebuffer. For single-plane
584 * framebuffers, we can fall back to create_handle.
585 */
586 if (!fb->obj[0] &&
587 (fb->format->num_planes > 1 || !fb->funcs->create_handle)) {
588 ret = -ENODEV;
589 goto out;
590 }
591
592 r->height = fb->height;
593 r->width = fb->width;
594 r->pixel_format = fb->format->format;
595
596 r->flags = 0;
597 if (!dev->mode_config.fb_modifiers_not_supported)
598 r->flags |= DRM_MODE_FB_MODIFIERS;
599
600 for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
601 r->handles[i] = 0;
602 r->pitches[i] = 0;
603 r->offsets[i] = 0;
604 r->modifier[i] = 0;
605 }
606
607 for (i = 0; i < fb->format->num_planes; i++) {
608 r->pitches[i] = fb->pitches[i];
609 r->offsets[i] = fb->offsets[i];
610 if (!dev->mode_config.fb_modifiers_not_supported)
611 r->modifier[i] = fb->modifier;
612 }
613
614 /* GET_FB2() is an unprivileged ioctl so we must not return a
615 * buffer-handle to non master/root processes! To match GET_FB()
616 * just return invalid handles (0) for non masters/root
617 * rather than making GET_FB2() privileged.
618 */
619 if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN)) {
620 ret = 0;
621 goto out;
622 }
623
624 for (i = 0; i < fb->format->num_planes; i++) {
625 int j;
626
627 /* If we reuse the same object for multiple planes, also
628 * return the same handle.
629 */
630 for (j = 0; j < i; j++) {
631 if (fb->obj[i] == fb->obj[j]) {
632 r->handles[i] = r->handles[j];
633 break;
634 }
635 }
636
637 if (r->handles[i])
638 continue;
639
640 if (fb->obj[i]) {
641 ret = drm_gem_handle_create(file_priv, fb->obj[i],
642 &r->handles[i]);
643 } else {
644 WARN_ON(i > 0);
645 ret = fb->funcs->create_handle(fb, file_priv,
646 &r->handles[i]);
647 }
648
649 if (ret != 0)
650 goto out;
651 }
652
653out:
654 if (ret != 0) {
655 /* Delete any previously-created handles on failure. */
656 for (i = 0; i < ARRAY_SIZE(r->handles); i++) {
657 int j;
658
659 if (r->handles[i])
660 drm_gem_handle_delete(file_priv, r->handles[i]);
661
662 /* Zero out any handles identical to the one we just
663 * deleted.
664 */
665 for (j = i + 1; j < ARRAY_SIZE(r->handles); j++) {
666 if (r->handles[j] == r->handles[i])
667 r->handles[j] = 0;
668 }
669 }
670 }
671
672 drm_framebuffer_put(fb);
673 return ret;
674}
675
676/**
677 * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
678 * @dev: drm device for the ioctl
679 * @data: data pointer for the ioctl
680 * @file_priv: drm file for the ioctl call
681 *
682 * Lookup the FB and flush out the damaged area supplied by userspace as a clip
683 * rectangle list. Generic userspace which does frontbuffer rendering must call
684 * this ioctl to flush out the changes on manual-update display outputs, e.g.
685 * usb display-link, mipi manual update panels or edp panel self refresh modes.
686 *
687 * Modesetting drivers which always update the frontbuffer do not need to
688 * implement the corresponding &drm_framebuffer_funcs.dirty callback.
689 *
690 * Called by the user via ioctl.
691 *
692 * Returns:
693 * Zero on success, negative errno on failure.
694 */
695int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
696 void *data, struct drm_file *file_priv)
697{
698 struct drm_clip_rect __user *clips_ptr;
699 struct drm_clip_rect *clips = NULL;
700 struct drm_mode_fb_dirty_cmd *r = data;
701 struct drm_framebuffer *fb;
702 unsigned flags;
703 int num_clips;
704 int ret;
705
706 if (!drm_core_check_feature(dev, DRIVER_MODESET))
707 return -EOPNOTSUPP;
708
709 fb = drm_framebuffer_lookup(dev, file_priv, r->fb_id);
710 if (!fb)
711 return -ENOENT;
712
713 num_clips = r->num_clips;
714 clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
715
716 if (!num_clips != !clips_ptr) {
717 ret = -EINVAL;
718 goto out_err1;
719 }
720
721 flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
722
723 /* If userspace annotates copy, clips must come in pairs */
724 if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
725 ret = -EINVAL;
726 goto out_err1;
727 }
728
729 if (num_clips && clips_ptr) {
730 if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
731 ret = -EINVAL;
732 goto out_err1;
733 }
734 clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
735 if (!clips) {
736 ret = -ENOMEM;
737 goto out_err1;
738 }
739
740 ret = copy_from_user(clips, clips_ptr,
741 num_clips * sizeof(*clips));
742 if (ret) {
743 ret = -EFAULT;
744 goto out_err2;
745 }
746 }
747
748 if (fb->funcs->dirty) {
749 ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
750 clips, num_clips);
751 } else {
752 ret = -ENOSYS;
753 }
754
755out_err2:
756 kfree(clips);
757out_err1:
758 drm_framebuffer_put(fb);
759
760 return ret;
761}
762
763/**
764 * drm_fb_release - remove and free the FBs on this file
765 * @priv: drm file for the ioctl
766 *
767 * Destroy all the FBs associated with @filp.
768 *
769 * Called by the user via ioctl.
770 *
771 * Returns:
772 * Zero on success, negative errno on failure.
773 */
774void drm_fb_release(struct drm_file *priv)
775{
776 struct drm_framebuffer *fb, *tfb;
777 struct drm_mode_rmfb_work arg;
778
779 INIT_LIST_HEAD(&arg.fbs);
780
781 /*
782 * When the file gets released that means no one else can access the fb
783 * list any more, so no need to grab fpriv->fbs_lock. And we need to
784 * avoid upsetting lockdep since the universal cursor code adds a
785 * framebuffer while holding mutex locks.
786 *
787 * Note that a real deadlock between fpriv->fbs_lock and the modeset
788 * locks is impossible here since no one else but this function can get
789 * at it any more.
790 */
791 list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
792 if (drm_framebuffer_read_refcount(fb) > 1) {
793 list_move_tail(&fb->filp_head, &arg.fbs);
794 } else {
795 list_del_init(&fb->filp_head);
796
797 /* This drops the fpriv->fbs reference. */
798 drm_framebuffer_put(fb);
799 }
800 }
801
802 if (!list_empty(&arg.fbs)) {
803 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
804
805 schedule_work(&arg.work);
806 flush_work(&arg.work);
807 destroy_work_on_stack(&arg.work);
808 }
809}
810
811void drm_framebuffer_free(struct kref *kref)
812{
813 struct drm_framebuffer *fb =
814 container_of(kref, struct drm_framebuffer, base.refcount);
815 struct drm_device *dev = fb->dev;
816
817 /*
818 * The lookup idr holds a weak reference, which has not necessarily been
819 * removed at this point. Check for that.
820 */
821 drm_mode_object_unregister(dev, &fb->base);
822
823 fb->funcs->destroy(fb);
824}
825
826/**
827 * drm_framebuffer_init - initialize a framebuffer
828 * @dev: DRM device
829 * @fb: framebuffer to be initialized
830 * @funcs: ... with these functions
831 *
832 * Allocates an ID for the framebuffer's parent mode object, sets its mode
833 * functions & device file and adds it to the master fd list.
834 *
835 * IMPORTANT:
836 * This functions publishes the fb and makes it available for concurrent access
837 * by other users. Which means by this point the fb _must_ be fully set up -
838 * since all the fb attributes are invariant over its lifetime, no further
839 * locking but only correct reference counting is required.
840 *
841 * Returns:
842 * Zero on success, error code on failure.
843 */
844int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
845 const struct drm_framebuffer_funcs *funcs)
846{
847 int ret;
848
849 if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
850 return -EINVAL;
851
852 INIT_LIST_HEAD(&fb->filp_head);
853
854 fb->funcs = funcs;
855 strcpy(fb->comm, current->comm);
856
857 ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
858 false, drm_framebuffer_free);
859 if (ret)
860 goto out;
861
862 mutex_lock(&dev->mode_config.fb_lock);
863 dev->mode_config.num_fb++;
864 list_add(&fb->head, &dev->mode_config.fb_list);
865 mutex_unlock(&dev->mode_config.fb_lock);
866
867 drm_mode_object_register(dev, &fb->base);
868out:
869 return ret;
870}
871EXPORT_SYMBOL(drm_framebuffer_init);
872
873/**
874 * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
875 * @dev: drm device
876 * @file_priv: drm file to check for lease against.
877 * @id: id of the fb object
878 *
879 * If successful, this grabs an additional reference to the framebuffer -
880 * callers need to make sure to eventually unreference the returned framebuffer
881 * again, using drm_framebuffer_put().
882 */
883struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
884 struct drm_file *file_priv,
885 uint32_t id)
886{
887 struct drm_mode_object *obj;
888 struct drm_framebuffer *fb = NULL;
889
890 obj = __drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_FB);
891 if (obj)
892 fb = obj_to_fb(obj);
893 return fb;
894}
895EXPORT_SYMBOL(drm_framebuffer_lookup);
896
897/**
898 * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
899 * @fb: fb to unregister
900 *
901 * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
902 * those used for fbdev. Note that the caller must hold a reference of its own,
903 * i.e. the object may not be destroyed through this call (since it'll lead to a
904 * locking inversion).
905 *
906 * NOTE: This function is deprecated. For driver-private framebuffers it is not
907 * recommended to embed a framebuffer struct info fbdev struct, instead, a
908 * framebuffer pointer is preferred and drm_framebuffer_put() should be called
909 * when the framebuffer is to be cleaned up.
910 */
911void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
912{
913 struct drm_device *dev;
914
915 if (!fb)
916 return;
917
918 dev = fb->dev;
919
920 /* Mark fb as reaped and drop idr ref. */
921 drm_mode_object_unregister(dev, &fb->base);
922}
923EXPORT_SYMBOL(drm_framebuffer_unregister_private);
924
925/**
926 * drm_framebuffer_cleanup - remove a framebuffer object
927 * @fb: framebuffer to remove
928 *
929 * Cleanup framebuffer. This function is intended to be used from the drivers
930 * &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
931 * driver private framebuffers embedded into a larger structure.
932 *
933 * Note that this function does not remove the fb from active usage - if it is
934 * still used anywhere, hilarity can ensue since userspace could call getfb on
935 * the id and get back -EINVAL. Obviously no concern at driver unload time.
936 *
937 * Also, the framebuffer will not be removed from the lookup idr - for
938 * user-created framebuffers this will happen in the rmfb ioctl. For
939 * driver-private objects (e.g. for fbdev) drivers need to explicitly call
940 * drm_framebuffer_unregister_private.
941 */
942void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
943{
944 struct drm_device *dev = fb->dev;
945
946 mutex_lock(&dev->mode_config.fb_lock);
947 list_del(&fb->head);
948 dev->mode_config.num_fb--;
949 mutex_unlock(&dev->mode_config.fb_lock);
950}
951EXPORT_SYMBOL(drm_framebuffer_cleanup);
952
953static int atomic_remove_fb(struct drm_framebuffer *fb)
954{
955 struct drm_modeset_acquire_ctx ctx;
956 struct drm_device *dev = fb->dev;
957 struct drm_atomic_state *state;
958 struct drm_plane *plane;
959 struct drm_connector *conn __maybe_unused;
960 struct drm_connector_state *conn_state;
961 int i, ret;
962 unsigned plane_mask;
963 bool disable_crtcs = false;
964
965retry_disable:
966 drm_modeset_acquire_init(&ctx, 0);
967
968 state = drm_atomic_state_alloc(dev);
969 if (!state) {
970 ret = -ENOMEM;
971 goto out;
972 }
973 state->acquire_ctx = &ctx;
974
975retry:
976 plane_mask = 0;
977 ret = drm_modeset_lock_all_ctx(dev, &ctx);
978 if (ret)
979 goto unlock;
980
981 drm_for_each_plane(plane, dev) {
982 struct drm_plane_state *plane_state;
983
984 if (plane->state->fb != fb)
985 continue;
986
987 drm_dbg_kms(dev,
988 "Disabling [PLANE:%d:%s] because [FB:%d] is removed\n",
989 plane->base.id, plane->name, fb->base.id);
990
991 plane_state = drm_atomic_get_plane_state(state, plane);
992 if (IS_ERR(plane_state)) {
993 ret = PTR_ERR(plane_state);
994 goto unlock;
995 }
996
997 if (disable_crtcs && plane_state->crtc->primary == plane) {
998 struct drm_crtc_state *crtc_state;
999
1000 drm_dbg_kms(dev,
1001 "Disabling [CRTC:%d:%s] because [FB:%d] is removed\n",
1002 plane_state->crtc->base.id,
1003 plane_state->crtc->name, fb->base.id);
1004
1005 crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
1006
1007 ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
1008 if (ret)
1009 goto unlock;
1010
1011 crtc_state->active = false;
1012 ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1013 if (ret)
1014 goto unlock;
1015 }
1016
1017 drm_atomic_set_fb_for_plane(plane_state, NULL);
1018 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1019 if (ret)
1020 goto unlock;
1021
1022 plane_mask |= drm_plane_mask(plane);
1023 }
1024
1025 /* This list is only filled when disable_crtcs is set. */
1026 for_each_new_connector_in_state(state, conn, conn_state, i) {
1027 ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
1028
1029 if (ret)
1030 goto unlock;
1031 }
1032
1033 if (plane_mask)
1034 ret = drm_atomic_commit(state);
1035
1036unlock:
1037 if (ret == -EDEADLK) {
1038 drm_atomic_state_clear(state);
1039 drm_modeset_backoff(&ctx);
1040 goto retry;
1041 }
1042
1043 drm_atomic_state_put(state);
1044
1045out:
1046 drm_modeset_drop_locks(&ctx);
1047 drm_modeset_acquire_fini(&ctx);
1048
1049 if (ret == -EINVAL && !disable_crtcs) {
1050 disable_crtcs = true;
1051 goto retry_disable;
1052 }
1053
1054 return ret;
1055}
1056
1057static void legacy_remove_fb(struct drm_framebuffer *fb)
1058{
1059 struct drm_device *dev = fb->dev;
1060 struct drm_crtc *crtc;
1061 struct drm_plane *plane;
1062
1063 drm_modeset_lock_all(dev);
1064 /* remove from any CRTC */
1065 drm_for_each_crtc(crtc, dev) {
1066 if (crtc->primary->fb == fb) {
1067 drm_dbg_kms(dev,
1068 "Disabling [CRTC:%d:%s] because [FB:%d] is removed\n",
1069 crtc->base.id, crtc->name, fb->base.id);
1070
1071 /* should turn off the crtc */
1072 if (drm_crtc_force_disable(crtc))
1073 DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
1074 }
1075 }
1076
1077 drm_for_each_plane(plane, dev) {
1078 if (plane->fb == fb) {
1079 drm_dbg_kms(dev,
1080 "Disabling [PLANE:%d:%s] because [FB:%d] is removed\n",
1081 plane->base.id, plane->name, fb->base.id);
1082 drm_plane_force_disable(plane);
1083 }
1084 }
1085 drm_modeset_unlock_all(dev);
1086}
1087
1088/**
1089 * drm_framebuffer_remove - remove and unreference a framebuffer object
1090 * @fb: framebuffer to remove
1091 *
1092 * Scans all the CRTCs and planes in @dev's mode_config. If they're
1093 * using @fb, removes it, setting it to NULL. Then drops the reference to the
1094 * passed-in framebuffer. Might take the modeset locks.
1095 *
1096 * Note that this function optimizes the cleanup away if the caller holds the
1097 * last reference to the framebuffer. It is also guaranteed to not take the
1098 * modeset locks in this case.
1099 */
1100void drm_framebuffer_remove(struct drm_framebuffer *fb)
1101{
1102 struct drm_device *dev;
1103
1104 if (!fb)
1105 return;
1106
1107 dev = fb->dev;
1108
1109 WARN_ON(!list_empty(&fb->filp_head));
1110
1111 /*
1112 * drm ABI mandates that we remove any deleted framebuffers from active
1113 * usage. But since most sane clients only remove framebuffers they no
1114 * longer need, try to optimize this away.
1115 *
1116 * Since we're holding a reference ourselves, observing a refcount of 1
1117 * means that we're the last holder and can skip it. Also, the refcount
1118 * can never increase from 1 again, so we don't need any barriers or
1119 * locks.
1120 *
1121 * Note that userspace could try to race with use and instate a new
1122 * usage _after_ we've cleared all current ones. End result will be an
1123 * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
1124 * in this manner.
1125 */
1126 if (drm_framebuffer_read_refcount(fb) > 1) {
1127 if (drm_drv_uses_atomic_modeset(dev)) {
1128 int ret = atomic_remove_fb(fb);
1129
1130 WARN(ret, "atomic remove_fb failed with %i\n", ret);
1131 } else
1132 legacy_remove_fb(fb);
1133 }
1134
1135 drm_framebuffer_put(fb);
1136}
1137EXPORT_SYMBOL(drm_framebuffer_remove);
1138
1139/**
1140 * drm_framebuffer_plane_width - width of the plane given the first plane
1141 * @width: width of the first plane
1142 * @fb: the framebuffer
1143 * @plane: plane index
1144 *
1145 * Returns:
1146 * The width of @plane, given that the width of the first plane is @width.
1147 */
1148int drm_framebuffer_plane_width(int width,
1149 const struct drm_framebuffer *fb, int plane)
1150{
1151 if (plane >= fb->format->num_planes)
1152 return 0;
1153
1154 return fb_plane_width(width, fb->format, plane);
1155}
1156EXPORT_SYMBOL(drm_framebuffer_plane_width);
1157
1158/**
1159 * drm_framebuffer_plane_height - height of the plane given the first plane
1160 * @height: height of the first plane
1161 * @fb: the framebuffer
1162 * @plane: plane index
1163 *
1164 * Returns:
1165 * The height of @plane, given that the height of the first plane is @height.
1166 */
1167int drm_framebuffer_plane_height(int height,
1168 const struct drm_framebuffer *fb, int plane)
1169{
1170 if (plane >= fb->format->num_planes)
1171 return 0;
1172
1173 return fb_plane_height(height, fb->format, plane);
1174}
1175EXPORT_SYMBOL(drm_framebuffer_plane_height);
1176
1177void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
1178 const struct drm_framebuffer *fb)
1179{
1180 unsigned int i;
1181
1182 drm_printf_indent(p, indent, "allocated by = %s\n", fb->comm);
1183 drm_printf_indent(p, indent, "refcount=%u\n",
1184 drm_framebuffer_read_refcount(fb));
1185 drm_printf_indent(p, indent, "format=%p4cc\n", &fb->format->format);
1186 drm_printf_indent(p, indent, "modifier=0x%llx\n", fb->modifier);
1187 drm_printf_indent(p, indent, "size=%ux%u\n", fb->width, fb->height);
1188 drm_printf_indent(p, indent, "layers:\n");
1189
1190 for (i = 0; i < fb->format->num_planes; i++) {
1191 drm_printf_indent(p, indent + 1, "size[%u]=%dx%d\n", i,
1192 drm_framebuffer_plane_width(fb->width, fb, i),
1193 drm_framebuffer_plane_height(fb->height, fb, i));
1194 drm_printf_indent(p, indent + 1, "pitch[%u]=%u\n", i, fb->pitches[i]);
1195 drm_printf_indent(p, indent + 1, "offset[%u]=%u\n", i, fb->offsets[i]);
1196 drm_printf_indent(p, indent + 1, "obj[%u]:%s\n", i,
1197 fb->obj[i] ? "" : "(null)");
1198 if (fb->obj[i])
1199 drm_gem_print_info(p, indent + 2, fb->obj[i]);
1200 }
1201}
1202
1203#ifdef CONFIG_DEBUG_FS
1204static int drm_framebuffer_info(struct seq_file *m, void *data)
1205{
1206 struct drm_info_node *node = m->private;
1207 struct drm_device *dev = node->minor->dev;
1208 struct drm_printer p = drm_seq_file_printer(m);
1209 struct drm_framebuffer *fb;
1210
1211 mutex_lock(&dev->mode_config.fb_lock);
1212 drm_for_each_fb(fb, dev) {
1213 drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
1214 drm_framebuffer_print_info(&p, 1, fb);
1215 }
1216 mutex_unlock(&dev->mode_config.fb_lock);
1217
1218 return 0;
1219}
1220
1221static const struct drm_info_list drm_framebuffer_debugfs_list[] = {
1222 { "framebuffer", drm_framebuffer_info, 0 },
1223};
1224
1225void drm_framebuffer_debugfs_init(struct drm_minor *minor)
1226{
1227 drm_debugfs_create_files(drm_framebuffer_debugfs_list,
1228 ARRAY_SIZE(drm_framebuffer_debugfs_list),
1229 minor->debugfs_root, minor);
1230}
1231#endif