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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 <drm/drmP.h>
25#include <drm/drm_auth.h>
26#include <drm/drm_framebuffer.h>
27
28#include "drm_crtc_internal.h"
29
30/**
31 * DOC: overview
32 *
33 * Frame buffers are abstract memory objects that provide a source of pixels to
34 * scanout to a CRTC. Applications explicitly request the creation of frame
35 * buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
36 * handle that can be passed to the KMS CRTC control, plane configuration and
37 * page flip functions.
38 *
39 * Frame buffers rely on the underlying memory manager for allocating backing
40 * storage. When creating a frame buffer applications pass a memory handle
41 * (or a list of memory handles for multi-planar formats) through the
42 * struct &drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
43 * buffer management interface this would be a GEM handle. Drivers are however
44 * free to use their own backing storage object handles, e.g. vmwgfx directly
45 * exposes special TTM handles to userspace and so expects TTM handles in the
46 * create ioctl and not GEM handles.
47 *
48 * Framebuffers are tracked with struct &drm_framebuffer. They are published
49 * using drm_framebuffer_init() - after calling that function userspace can use
50 * and access the framebuffer object. The helper function
51 * drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
52 * metadata fields.
53 *
54 * The lifetime of a drm framebuffer is controlled with a reference count,
55 * drivers can grab additional references with drm_framebuffer_reference() and
56 * drop them again with drm_framebuffer_unreference(). For driver-private
57 * framebuffers for which the last reference is never dropped (e.g. for the
58 * fbdev framebuffer when the struct struct &drm_framebuffer is embedded into
59 * the fbdev helper struct) drivers can manually clean up a framebuffer at
60 * module unload time with drm_framebuffer_unregister_private(). But doing this
61 * is not recommended, and it's better to have a normal free-standing struct
62 * &drm_framebuffer.
63 */
64
65int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
66 uint32_t src_w, uint32_t src_h,
67 const struct drm_framebuffer *fb)
68{
69 unsigned int fb_width, fb_height;
70
71 fb_width = fb->width << 16;
72 fb_height = fb->height << 16;
73
74 /* Make sure source coordinates are inside the fb. */
75 if (src_w > fb_width ||
76 src_x > fb_width - src_w ||
77 src_h > fb_height ||
78 src_y > fb_height - src_h) {
79 DRM_DEBUG_KMS("Invalid source coordinates "
80 "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
81 src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
82 src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
83 src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
84 src_y >> 16, ((src_y & 0xffff) * 15625) >> 10);
85 return -ENOSPC;
86 }
87
88 return 0;
89}
90
91/**
92 * drm_mode_addfb - add an FB to the graphics configuration
93 * @dev: drm device for the ioctl
94 * @data: data pointer for the ioctl
95 * @file_priv: drm file for the ioctl call
96 *
97 * Add a new FB to the specified CRTC, given a user request. This is the
98 * original addfb ioctl which only supported RGB formats.
99 *
100 * Called by the user via ioctl.
101 *
102 * Returns:
103 * Zero on success, negative errno on failure.
104 */
105int drm_mode_addfb(struct drm_device *dev,
106 void *data, struct drm_file *file_priv)
107{
108 struct drm_mode_fb_cmd *or = data;
109 struct drm_mode_fb_cmd2 r = {};
110 int ret;
111
112 /* convert to new format and call new ioctl */
113 r.fb_id = or->fb_id;
114 r.width = or->width;
115 r.height = or->height;
116 r.pitches[0] = or->pitch;
117 r.pixel_format = drm_mode_legacy_fb_format(or->bpp, or->depth);
118 r.handles[0] = or->handle;
119
120 ret = drm_mode_addfb2(dev, &r, file_priv);
121 if (ret)
122 return ret;
123
124 or->fb_id = r.fb_id;
125
126 return 0;
127}
128
129static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
130{
131 const struct drm_format_info *info;
132 int i;
133
134 info = __drm_format_info(r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN);
135 if (!info) {
136 struct drm_format_name_buf format_name;
137 DRM_DEBUG_KMS("bad framebuffer format %s\n",
138 drm_get_format_name(r->pixel_format,
139 &format_name));
140 return -EINVAL;
141 }
142
143 if (r->width == 0 || r->width % info->hsub) {
144 DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
145 return -EINVAL;
146 }
147
148 if (r->height == 0 || r->height % info->vsub) {
149 DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
150 return -EINVAL;
151 }
152
153 for (i = 0; i < info->num_planes; i++) {
154 unsigned int width = r->width / (i != 0 ? info->hsub : 1);
155 unsigned int height = r->height / (i != 0 ? info->vsub : 1);
156 unsigned int cpp = info->cpp[i];
157
158 if (!r->handles[i]) {
159 DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
160 return -EINVAL;
161 }
162
163 if ((uint64_t) width * cpp > UINT_MAX)
164 return -ERANGE;
165
166 if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
167 return -ERANGE;
168
169 if (r->pitches[i] < width * cpp) {
170 DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
171 return -EINVAL;
172 }
173
174 if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
175 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
176 r->modifier[i], i);
177 return -EINVAL;
178 }
179
180 if (r->flags & DRM_MODE_FB_MODIFIERS &&
181 r->modifier[i] != r->modifier[0]) {
182 DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
183 r->modifier[i], i);
184 return -EINVAL;
185 }
186
187 /* modifier specific checks: */
188 switch (r->modifier[i]) {
189 case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
190 /* NOTE: the pitch restriction may be lifted later if it turns
191 * out that no hw has this restriction:
192 */
193 if (r->pixel_format != DRM_FORMAT_NV12 ||
194 width % 128 || height % 32 ||
195 r->pitches[i] % 128) {
196 DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
197 return -EINVAL;
198 }
199 break;
200
201 default:
202 break;
203 }
204 }
205
206 for (i = info->num_planes; i < 4; i++) {
207 if (r->modifier[i]) {
208 DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
209 return -EINVAL;
210 }
211
212 /* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
213 if (!(r->flags & DRM_MODE_FB_MODIFIERS))
214 continue;
215
216 if (r->handles[i]) {
217 DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
218 return -EINVAL;
219 }
220
221 if (r->pitches[i]) {
222 DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
223 return -EINVAL;
224 }
225
226 if (r->offsets[i]) {
227 DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
228 return -EINVAL;
229 }
230 }
231
232 return 0;
233}
234
235struct drm_framebuffer *
236drm_internal_framebuffer_create(struct drm_device *dev,
237 const struct drm_mode_fb_cmd2 *r,
238 struct drm_file *file_priv)
239{
240 struct drm_mode_config *config = &dev->mode_config;
241 struct drm_framebuffer *fb;
242 int ret;
243
244 if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
245 DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
246 return ERR_PTR(-EINVAL);
247 }
248
249 if ((config->min_width > r->width) || (r->width > config->max_width)) {
250 DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
251 r->width, config->min_width, config->max_width);
252 return ERR_PTR(-EINVAL);
253 }
254 if ((config->min_height > r->height) || (r->height > config->max_height)) {
255 DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
256 r->height, config->min_height, config->max_height);
257 return ERR_PTR(-EINVAL);
258 }
259
260 if (r->flags & DRM_MODE_FB_MODIFIERS &&
261 !dev->mode_config.allow_fb_modifiers) {
262 DRM_DEBUG_KMS("driver does not support fb modifiers\n");
263 return ERR_PTR(-EINVAL);
264 }
265
266 ret = framebuffer_check(r);
267 if (ret)
268 return ERR_PTR(ret);
269
270 fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
271 if (IS_ERR(fb)) {
272 DRM_DEBUG_KMS("could not create framebuffer\n");
273 return fb;
274 }
275
276 return fb;
277}
278
279/**
280 * drm_mode_addfb2 - add an FB to the graphics configuration
281 * @dev: drm device for the ioctl
282 * @data: data pointer for the ioctl
283 * @file_priv: drm file for the ioctl call
284 *
285 * Add a new FB to the specified CRTC, given a user request with format. This is
286 * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
287 * and uses fourcc codes as pixel format specifiers.
288 *
289 * Called by the user via ioctl.
290 *
291 * Returns:
292 * Zero on success, negative errno on failure.
293 */
294int drm_mode_addfb2(struct drm_device *dev,
295 void *data, struct drm_file *file_priv)
296{
297 struct drm_mode_fb_cmd2 *r = data;
298 struct drm_framebuffer *fb;
299
300 if (!drm_core_check_feature(dev, DRIVER_MODESET))
301 return -EINVAL;
302
303 fb = drm_internal_framebuffer_create(dev, r, file_priv);
304 if (IS_ERR(fb))
305 return PTR_ERR(fb);
306
307 DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
308 r->fb_id = fb->base.id;
309
310 /* Transfer ownership to the filp for reaping on close */
311 mutex_lock(&file_priv->fbs_lock);
312 list_add(&fb->filp_head, &file_priv->fbs);
313 mutex_unlock(&file_priv->fbs_lock);
314
315 return 0;
316}
317
318struct drm_mode_rmfb_work {
319 struct work_struct work;
320 struct list_head fbs;
321};
322
323static void drm_mode_rmfb_work_fn(struct work_struct *w)
324{
325 struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
326
327 while (!list_empty(&arg->fbs)) {
328 struct drm_framebuffer *fb =
329 list_first_entry(&arg->fbs, typeof(*fb), filp_head);
330
331 list_del_init(&fb->filp_head);
332 drm_framebuffer_remove(fb);
333 }
334}
335
336/**
337 * drm_mode_rmfb - remove an FB from the configuration
338 * @dev: drm device for the ioctl
339 * @data: data pointer for the ioctl
340 * @file_priv: drm file for the ioctl call
341 *
342 * Remove the FB specified by the user.
343 *
344 * Called by the user via ioctl.
345 *
346 * Returns:
347 * Zero on success, negative errno on failure.
348 */
349int drm_mode_rmfb(struct drm_device *dev,
350 void *data, struct drm_file *file_priv)
351{
352 struct drm_framebuffer *fb = NULL;
353 struct drm_framebuffer *fbl = NULL;
354 uint32_t *id = data;
355 int found = 0;
356
357 if (!drm_core_check_feature(dev, DRIVER_MODESET))
358 return -EINVAL;
359
360 fb = drm_framebuffer_lookup(dev, *id);
361 if (!fb)
362 return -ENOENT;
363
364 mutex_lock(&file_priv->fbs_lock);
365 list_for_each_entry(fbl, &file_priv->fbs, filp_head)
366 if (fb == fbl)
367 found = 1;
368 if (!found) {
369 mutex_unlock(&file_priv->fbs_lock);
370 goto fail_unref;
371 }
372
373 list_del_init(&fb->filp_head);
374 mutex_unlock(&file_priv->fbs_lock);
375
376 /* drop the reference we picked up in framebuffer lookup */
377 drm_framebuffer_unreference(fb);
378
379 /*
380 * we now own the reference that was stored in the fbs list
381 *
382 * drm_framebuffer_remove may fail with -EINTR on pending signals,
383 * so run this in a separate stack as there's no way to correctly
384 * handle this after the fb is already removed from the lookup table.
385 */
386 if (drm_framebuffer_read_refcount(fb) > 1) {
387 struct drm_mode_rmfb_work arg;
388
389 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
390 INIT_LIST_HEAD(&arg.fbs);
391 list_add_tail(&fb->filp_head, &arg.fbs);
392
393 schedule_work(&arg.work);
394 flush_work(&arg.work);
395 destroy_work_on_stack(&arg.work);
396 } else
397 drm_framebuffer_unreference(fb);
398
399 return 0;
400
401fail_unref:
402 drm_framebuffer_unreference(fb);
403 return -ENOENT;
404}
405
406/**
407 * drm_mode_getfb - get FB info
408 * @dev: drm device for the ioctl
409 * @data: data pointer for the ioctl
410 * @file_priv: drm file for the ioctl call
411 *
412 * Lookup the FB given its ID and return info about it.
413 *
414 * Called by the user via ioctl.
415 *
416 * Returns:
417 * Zero on success, negative errno on failure.
418 */
419int drm_mode_getfb(struct drm_device *dev,
420 void *data, struct drm_file *file_priv)
421{
422 struct drm_mode_fb_cmd *r = data;
423 struct drm_framebuffer *fb;
424 int ret;
425
426 if (!drm_core_check_feature(dev, DRIVER_MODESET))
427 return -EINVAL;
428
429 fb = drm_framebuffer_lookup(dev, r->fb_id);
430 if (!fb)
431 return -ENOENT;
432
433 r->height = fb->height;
434 r->width = fb->width;
435 r->depth = fb->depth;
436 r->bpp = fb->bits_per_pixel;
437 r->pitch = fb->pitches[0];
438 if (fb->funcs->create_handle) {
439 if (drm_is_current_master(file_priv) || capable(CAP_SYS_ADMIN) ||
440 drm_is_control_client(file_priv)) {
441 ret = fb->funcs->create_handle(fb, file_priv,
442 &r->handle);
443 } else {
444 /* GET_FB() is an unprivileged ioctl so we must not
445 * return a buffer-handle to non-master processes! For
446 * backwards-compatibility reasons, we cannot make
447 * GET_FB() privileged, so just return an invalid handle
448 * for non-masters. */
449 r->handle = 0;
450 ret = 0;
451 }
452 } else {
453 ret = -ENODEV;
454 }
455
456 drm_framebuffer_unreference(fb);
457
458 return ret;
459}
460
461/**
462 * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
463 * @dev: drm device for the ioctl
464 * @data: data pointer for the ioctl
465 * @file_priv: drm file for the ioctl call
466 *
467 * Lookup the FB and flush out the damaged area supplied by userspace as a clip
468 * rectangle list. Generic userspace which does frontbuffer rendering must call
469 * this ioctl to flush out the changes on manual-update display outputs, e.g.
470 * usb display-link, mipi manual update panels or edp panel self refresh modes.
471 *
472 * Modesetting drivers which always update the frontbuffer do not need to
473 * implement the corresponding ->dirty framebuffer callback.
474 *
475 * Called by the user via ioctl.
476 *
477 * Returns:
478 * Zero on success, negative errno on failure.
479 */
480int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
481 void *data, struct drm_file *file_priv)
482{
483 struct drm_clip_rect __user *clips_ptr;
484 struct drm_clip_rect *clips = NULL;
485 struct drm_mode_fb_dirty_cmd *r = data;
486 struct drm_framebuffer *fb;
487 unsigned flags;
488 int num_clips;
489 int ret;
490
491 if (!drm_core_check_feature(dev, DRIVER_MODESET))
492 return -EINVAL;
493
494 fb = drm_framebuffer_lookup(dev, r->fb_id);
495 if (!fb)
496 return -ENOENT;
497
498 num_clips = r->num_clips;
499 clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
500
501 if (!num_clips != !clips_ptr) {
502 ret = -EINVAL;
503 goto out_err1;
504 }
505
506 flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
507
508 /* If userspace annotates copy, clips must come in pairs */
509 if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
510 ret = -EINVAL;
511 goto out_err1;
512 }
513
514 if (num_clips && clips_ptr) {
515 if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
516 ret = -EINVAL;
517 goto out_err1;
518 }
519 clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
520 if (!clips) {
521 ret = -ENOMEM;
522 goto out_err1;
523 }
524
525 ret = copy_from_user(clips, clips_ptr,
526 num_clips * sizeof(*clips));
527 if (ret) {
528 ret = -EFAULT;
529 goto out_err2;
530 }
531 }
532
533 if (fb->funcs->dirty) {
534 ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
535 clips, num_clips);
536 } else {
537 ret = -ENOSYS;
538 }
539
540out_err2:
541 kfree(clips);
542out_err1:
543 drm_framebuffer_unreference(fb);
544
545 return ret;
546}
547
548/**
549 * drm_fb_release - remove and free the FBs on this file
550 * @priv: drm file for the ioctl
551 *
552 * Destroy all the FBs associated with @filp.
553 *
554 * Called by the user via ioctl.
555 *
556 * Returns:
557 * Zero on success, negative errno on failure.
558 */
559void drm_fb_release(struct drm_file *priv)
560{
561 struct drm_framebuffer *fb, *tfb;
562 struct drm_mode_rmfb_work arg;
563
564 INIT_LIST_HEAD(&arg.fbs);
565
566 /*
567 * When the file gets released that means no one else can access the fb
568 * list any more, so no need to grab fpriv->fbs_lock. And we need to
569 * avoid upsetting lockdep since the universal cursor code adds a
570 * framebuffer while holding mutex locks.
571 *
572 * Note that a real deadlock between fpriv->fbs_lock and the modeset
573 * locks is impossible here since no one else but this function can get
574 * at it any more.
575 */
576 list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
577 if (drm_framebuffer_read_refcount(fb) > 1) {
578 list_move_tail(&fb->filp_head, &arg.fbs);
579 } else {
580 list_del_init(&fb->filp_head);
581
582 /* This drops the fpriv->fbs reference. */
583 drm_framebuffer_unreference(fb);
584 }
585 }
586
587 if (!list_empty(&arg.fbs)) {
588 INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
589
590 schedule_work(&arg.work);
591 flush_work(&arg.work);
592 destroy_work_on_stack(&arg.work);
593 }
594}
595
596void drm_framebuffer_free(struct kref *kref)
597{
598 struct drm_framebuffer *fb =
599 container_of(kref, struct drm_framebuffer, base.refcount);
600 struct drm_device *dev = fb->dev;
601
602 /*
603 * The lookup idr holds a weak reference, which has not necessarily been
604 * removed at this point. Check for that.
605 */
606 drm_mode_object_unregister(dev, &fb->base);
607
608 fb->funcs->destroy(fb);
609}
610
611/**
612 * drm_framebuffer_init - initialize a framebuffer
613 * @dev: DRM device
614 * @fb: framebuffer to be initialized
615 * @funcs: ... with these functions
616 *
617 * Allocates an ID for the framebuffer's parent mode object, sets its mode
618 * functions & device file and adds it to the master fd list.
619 *
620 * IMPORTANT:
621 * This functions publishes the fb and makes it available for concurrent access
622 * by other users. Which means by this point the fb _must_ be fully set up -
623 * since all the fb attributes are invariant over its lifetime, no further
624 * locking but only correct reference counting is required.
625 *
626 * Returns:
627 * Zero on success, error code on failure.
628 */
629int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
630 const struct drm_framebuffer_funcs *funcs)
631{
632 int ret;
633
634 INIT_LIST_HEAD(&fb->filp_head);
635 fb->dev = dev;
636 fb->funcs = funcs;
637
638 ret = drm_mode_object_get_reg(dev, &fb->base, DRM_MODE_OBJECT_FB,
639 false, drm_framebuffer_free);
640 if (ret)
641 goto out;
642
643 mutex_lock(&dev->mode_config.fb_lock);
644 dev->mode_config.num_fb++;
645 list_add(&fb->head, &dev->mode_config.fb_list);
646 mutex_unlock(&dev->mode_config.fb_lock);
647
648 drm_mode_object_register(dev, &fb->base);
649out:
650 return ret;
651}
652EXPORT_SYMBOL(drm_framebuffer_init);
653
654/**
655 * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
656 * @dev: drm device
657 * @id: id of the fb object
658 *
659 * If successful, this grabs an additional reference to the framebuffer -
660 * callers need to make sure to eventually unreference the returned framebuffer
661 * again, using @drm_framebuffer_unreference.
662 */
663struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
664 uint32_t id)
665{
666 struct drm_mode_object *obj;
667 struct drm_framebuffer *fb = NULL;
668
669 obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_FB);
670 if (obj)
671 fb = obj_to_fb(obj);
672 return fb;
673}
674EXPORT_SYMBOL(drm_framebuffer_lookup);
675
676/**
677 * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
678 * @fb: fb to unregister
679 *
680 * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
681 * those used for fbdev. Note that the caller must hold a reference of it's own,
682 * i.e. the object may not be destroyed through this call (since it'll lead to a
683 * locking inversion).
684 *
685 * NOTE: This function is deprecated. For driver-private framebuffers it is not
686 * recommended to embed a framebuffer struct info fbdev struct, instead, a
687 * framebuffer pointer is preferred and drm_framebuffer_unreference() should be
688 * called when the framebuffer is to be cleaned up.
689 */
690void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
691{
692 struct drm_device *dev;
693
694 if (!fb)
695 return;
696
697 dev = fb->dev;
698
699 /* Mark fb as reaped and drop idr ref. */
700 drm_mode_object_unregister(dev, &fb->base);
701}
702EXPORT_SYMBOL(drm_framebuffer_unregister_private);
703
704/**
705 * drm_framebuffer_cleanup - remove a framebuffer object
706 * @fb: framebuffer to remove
707 *
708 * Cleanup framebuffer. This function is intended to be used from the drivers
709 * ->destroy callback. It can also be used to clean up driver private
710 * framebuffers embedded into a larger structure.
711 *
712 * Note that this function does not remove the fb from active usuage - if it is
713 * still used anywhere, hilarity can ensue since userspace could call getfb on
714 * the id and get back -EINVAL. Obviously no concern at driver unload time.
715 *
716 * Also, the framebuffer will not be removed from the lookup idr - for
717 * user-created framebuffers this will happen in in the rmfb ioctl. For
718 * driver-private objects (e.g. for fbdev) drivers need to explicitly call
719 * drm_framebuffer_unregister_private.
720 */
721void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
722{
723 struct drm_device *dev = fb->dev;
724
725 mutex_lock(&dev->mode_config.fb_lock);
726 list_del(&fb->head);
727 dev->mode_config.num_fb--;
728 mutex_unlock(&dev->mode_config.fb_lock);
729}
730EXPORT_SYMBOL(drm_framebuffer_cleanup);
731
732/**
733 * drm_framebuffer_remove - remove and unreference a framebuffer object
734 * @fb: framebuffer to remove
735 *
736 * Scans all the CRTCs and planes in @dev's mode_config. If they're
737 * using @fb, removes it, setting it to NULL. Then drops the reference to the
738 * passed-in framebuffer. Might take the modeset locks.
739 *
740 * Note that this function optimizes the cleanup away if the caller holds the
741 * last reference to the framebuffer. It is also guaranteed to not take the
742 * modeset locks in this case.
743 */
744void drm_framebuffer_remove(struct drm_framebuffer *fb)
745{
746 struct drm_device *dev;
747 struct drm_crtc *crtc;
748 struct drm_plane *plane;
749
750 if (!fb)
751 return;
752
753 dev = fb->dev;
754
755 WARN_ON(!list_empty(&fb->filp_head));
756
757 /*
758 * drm ABI mandates that we remove any deleted framebuffers from active
759 * useage. But since most sane clients only remove framebuffers they no
760 * longer need, try to optimize this away.
761 *
762 * Since we're holding a reference ourselves, observing a refcount of 1
763 * means that we're the last holder and can skip it. Also, the refcount
764 * can never increase from 1 again, so we don't need any barriers or
765 * locks.
766 *
767 * Note that userspace could try to race with use and instate a new
768 * usage _after_ we've cleared all current ones. End result will be an
769 * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
770 * in this manner.
771 */
772 if (drm_framebuffer_read_refcount(fb) > 1) {
773 drm_modeset_lock_all(dev);
774 /* remove from any CRTC */
775 drm_for_each_crtc(crtc, dev) {
776 if (crtc->primary->fb == fb) {
777 /* should turn off the crtc */
778 if (drm_crtc_force_disable(crtc))
779 DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
780 }
781 }
782
783 drm_for_each_plane(plane, dev) {
784 if (plane->fb == fb)
785 drm_plane_force_disable(plane);
786 }
787 drm_modeset_unlock_all(dev);
788 }
789
790 drm_framebuffer_unreference(fb);
791}
792EXPORT_SYMBOL(drm_framebuffer_remove);
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