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1/*
2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 */
27
28
29#include <drm/drmP.h>
30#include <drm/drm_atomic.h>
31#include <drm/drm_mode.h>
32#include <drm/drm_plane_helper.h>
33
34/**
35 * drm_atomic_state_default_release -
36 * release memory initialized by drm_atomic_state_init
37 * @state: atomic state
38 *
39 * Free all the memory allocated by drm_atomic_state_init.
40 * This is useful for drivers that subclass the atomic state.
41 */
42void drm_atomic_state_default_release(struct drm_atomic_state *state)
43{
44 kfree(state->connectors);
45 kfree(state->connector_states);
46 kfree(state->crtcs);
47 kfree(state->crtc_states);
48 kfree(state->planes);
49 kfree(state->plane_states);
50}
51EXPORT_SYMBOL(drm_atomic_state_default_release);
52
53/**
54 * drm_atomic_state_init - init new atomic state
55 * @dev: DRM device
56 * @state: atomic state
57 *
58 * Default implementation for filling in a new atomic state.
59 * This is useful for drivers that subclass the atomic state.
60 */
61int
62drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
63{
64 /* TODO legacy paths should maybe do a better job about
65 * setting this appropriately?
66 */
67 state->allow_modeset = true;
68
69 state->crtcs = kcalloc(dev->mode_config.num_crtc,
70 sizeof(*state->crtcs), GFP_KERNEL);
71 if (!state->crtcs)
72 goto fail;
73 state->crtc_states = kcalloc(dev->mode_config.num_crtc,
74 sizeof(*state->crtc_states), GFP_KERNEL);
75 if (!state->crtc_states)
76 goto fail;
77 state->planes = kcalloc(dev->mode_config.num_total_plane,
78 sizeof(*state->planes), GFP_KERNEL);
79 if (!state->planes)
80 goto fail;
81 state->plane_states = kcalloc(dev->mode_config.num_total_plane,
82 sizeof(*state->plane_states), GFP_KERNEL);
83 if (!state->plane_states)
84 goto fail;
85
86 state->dev = dev;
87
88 DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
89
90 return 0;
91fail:
92 drm_atomic_state_default_release(state);
93 return -ENOMEM;
94}
95EXPORT_SYMBOL(drm_atomic_state_init);
96
97/**
98 * drm_atomic_state_alloc - allocate atomic state
99 * @dev: DRM device
100 *
101 * This allocates an empty atomic state to track updates.
102 */
103struct drm_atomic_state *
104drm_atomic_state_alloc(struct drm_device *dev)
105{
106 struct drm_mode_config *config = &dev->mode_config;
107 struct drm_atomic_state *state;
108
109 if (!config->funcs->atomic_state_alloc) {
110 state = kzalloc(sizeof(*state), GFP_KERNEL);
111 if (!state)
112 return NULL;
113 if (drm_atomic_state_init(dev, state) < 0) {
114 kfree(state);
115 return NULL;
116 }
117 return state;
118 }
119
120 return config->funcs->atomic_state_alloc(dev);
121}
122EXPORT_SYMBOL(drm_atomic_state_alloc);
123
124/**
125 * drm_atomic_state_default_clear - clear base atomic state
126 * @state: atomic state
127 *
128 * Default implementation for clearing atomic state.
129 * This is useful for drivers that subclass the atomic state.
130 */
131void drm_atomic_state_default_clear(struct drm_atomic_state *state)
132{
133 struct drm_device *dev = state->dev;
134 struct drm_mode_config *config = &dev->mode_config;
135 int i;
136
137 DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
138
139 for (i = 0; i < state->num_connector; i++) {
140 struct drm_connector *connector = state->connectors[i];
141
142 if (!connector)
143 continue;
144
145 /*
146 * FIXME: Async commits can race with connector unplugging and
147 * there's currently nothing that prevents cleanup up state for
148 * deleted connectors. As long as the callback doesn't look at
149 * the connector we'll be fine though, so make sure that's the
150 * case by setting all connector pointers to NULL.
151 */
152 state->connector_states[i]->connector = NULL;
153 connector->funcs->atomic_destroy_state(NULL,
154 state->connector_states[i]);
155 state->connectors[i] = NULL;
156 state->connector_states[i] = NULL;
157 }
158
159 for (i = 0; i < config->num_crtc; i++) {
160 struct drm_crtc *crtc = state->crtcs[i];
161
162 if (!crtc)
163 continue;
164
165 crtc->funcs->atomic_destroy_state(crtc,
166 state->crtc_states[i]);
167 state->crtcs[i] = NULL;
168 state->crtc_states[i] = NULL;
169 }
170
171 for (i = 0; i < config->num_total_plane; i++) {
172 struct drm_plane *plane = state->planes[i];
173
174 if (!plane)
175 continue;
176
177 plane->funcs->atomic_destroy_state(plane,
178 state->plane_states[i]);
179 state->planes[i] = NULL;
180 state->plane_states[i] = NULL;
181 }
182}
183EXPORT_SYMBOL(drm_atomic_state_default_clear);
184
185/**
186 * drm_atomic_state_clear - clear state object
187 * @state: atomic state
188 *
189 * When the w/w mutex algorithm detects a deadlock we need to back off and drop
190 * all locks. So someone else could sneak in and change the current modeset
191 * configuration. Which means that all the state assembled in @state is no
192 * longer an atomic update to the current state, but to some arbitrary earlier
193 * state. Which could break assumptions the driver's ->atomic_check likely
194 * relies on.
195 *
196 * Hence we must clear all cached state and completely start over, using this
197 * function.
198 */
199void drm_atomic_state_clear(struct drm_atomic_state *state)
200{
201 struct drm_device *dev = state->dev;
202 struct drm_mode_config *config = &dev->mode_config;
203
204 if (config->funcs->atomic_state_clear)
205 config->funcs->atomic_state_clear(state);
206 else
207 drm_atomic_state_default_clear(state);
208}
209EXPORT_SYMBOL(drm_atomic_state_clear);
210
211/**
212 * drm_atomic_state_free - free all memory for an atomic state
213 * @state: atomic state to deallocate
214 *
215 * This frees all memory associated with an atomic state, including all the
216 * per-object state for planes, crtcs and connectors.
217 */
218void drm_atomic_state_free(struct drm_atomic_state *state)
219{
220 struct drm_device *dev;
221 struct drm_mode_config *config;
222
223 if (!state)
224 return;
225
226 dev = state->dev;
227 config = &dev->mode_config;
228
229 drm_atomic_state_clear(state);
230
231 DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
232
233 if (config->funcs->atomic_state_free) {
234 config->funcs->atomic_state_free(state);
235 } else {
236 drm_atomic_state_default_release(state);
237 kfree(state);
238 }
239}
240EXPORT_SYMBOL(drm_atomic_state_free);
241
242/**
243 * drm_atomic_get_crtc_state - get crtc state
244 * @state: global atomic state object
245 * @crtc: crtc to get state object for
246 *
247 * This function returns the crtc state for the given crtc, allocating it if
248 * needed. It will also grab the relevant crtc lock to make sure that the state
249 * is consistent.
250 *
251 * Returns:
252 *
253 * Either the allocated state or the error code encoded into the pointer. When
254 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
255 * entire atomic sequence must be restarted. All other errors are fatal.
256 */
257struct drm_crtc_state *
258drm_atomic_get_crtc_state(struct drm_atomic_state *state,
259 struct drm_crtc *crtc)
260{
261 int ret, index = drm_crtc_index(crtc);
262 struct drm_crtc_state *crtc_state;
263
264 crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
265 if (crtc_state)
266 return crtc_state;
267
268 ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
269 if (ret)
270 return ERR_PTR(ret);
271
272 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
273 if (!crtc_state)
274 return ERR_PTR(-ENOMEM);
275
276 state->crtc_states[index] = crtc_state;
277 state->crtcs[index] = crtc;
278 crtc_state->state = state;
279
280 DRM_DEBUG_ATOMIC("Added [CRTC:%d:%s] %p state to %p\n",
281 crtc->base.id, crtc->name, crtc_state, state);
282
283 return crtc_state;
284}
285EXPORT_SYMBOL(drm_atomic_get_crtc_state);
286
287/**
288 * drm_atomic_set_mode_for_crtc - set mode for CRTC
289 * @state: the CRTC whose incoming state to update
290 * @mode: kernel-internal mode to use for the CRTC, or NULL to disable
291 *
292 * Set a mode (originating from the kernel) on the desired CRTC state. Does
293 * not change any other state properties, including enable, active, or
294 * mode_changed.
295 *
296 * RETURNS:
297 * Zero on success, error code on failure. Cannot return -EDEADLK.
298 */
299int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
300 struct drm_display_mode *mode)
301{
302 struct drm_mode_modeinfo umode;
303
304 /* Early return for no change. */
305 if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
306 return 0;
307
308 drm_property_unreference_blob(state->mode_blob);
309 state->mode_blob = NULL;
310
311 if (mode) {
312 drm_mode_convert_to_umode(&umode, mode);
313 state->mode_blob =
314 drm_property_create_blob(state->crtc->dev,
315 sizeof(umode),
316 &umode);
317 if (IS_ERR(state->mode_blob))
318 return PTR_ERR(state->mode_blob);
319
320 drm_mode_copy(&state->mode, mode);
321 state->enable = true;
322 DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
323 mode->name, state);
324 } else {
325 memset(&state->mode, 0, sizeof(state->mode));
326 state->enable = false;
327 DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
328 state);
329 }
330
331 return 0;
332}
333EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
334
335/**
336 * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
337 * @state: the CRTC whose incoming state to update
338 * @blob: pointer to blob property to use for mode
339 *
340 * Set a mode (originating from a blob property) on the desired CRTC state.
341 * This function will take a reference on the blob property for the CRTC state,
342 * and release the reference held on the state's existing mode property, if any
343 * was set.
344 *
345 * RETURNS:
346 * Zero on success, error code on failure. Cannot return -EDEADLK.
347 */
348int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
349 struct drm_property_blob *blob)
350{
351 if (blob == state->mode_blob)
352 return 0;
353
354 drm_property_unreference_blob(state->mode_blob);
355 state->mode_blob = NULL;
356
357 if (blob) {
358 if (blob->length != sizeof(struct drm_mode_modeinfo) ||
359 drm_mode_convert_umode(&state->mode,
360 (const struct drm_mode_modeinfo *)
361 blob->data))
362 return -EINVAL;
363
364 state->mode_blob = drm_property_reference_blob(blob);
365 state->enable = true;
366 DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
367 state->mode.name, state);
368 } else {
369 memset(&state->mode, 0, sizeof(state->mode));
370 state->enable = false;
371 DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
372 state);
373 }
374
375 return 0;
376}
377EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
378
379/**
380 * drm_atomic_replace_property_blob - replace a blob property
381 * @blob: a pointer to the member blob to be replaced
382 * @new_blob: the new blob to replace with
383 * @replaced: whether the blob has been replaced
384 *
385 * RETURNS:
386 * Zero on success, error code on failure
387 */
388static void
389drm_atomic_replace_property_blob(struct drm_property_blob **blob,
390 struct drm_property_blob *new_blob,
391 bool *replaced)
392{
393 struct drm_property_blob *old_blob = *blob;
394
395 if (old_blob == new_blob)
396 return;
397
398 if (old_blob)
399 drm_property_unreference_blob(old_blob);
400 if (new_blob)
401 drm_property_reference_blob(new_blob);
402 *blob = new_blob;
403 *replaced = true;
404
405 return;
406}
407
408static int
409drm_atomic_replace_property_blob_from_id(struct drm_crtc *crtc,
410 struct drm_property_blob **blob,
411 uint64_t blob_id,
412 ssize_t expected_size,
413 bool *replaced)
414{
415 struct drm_device *dev = crtc->dev;
416 struct drm_property_blob *new_blob = NULL;
417
418 if (blob_id != 0) {
419 new_blob = drm_property_lookup_blob(dev, blob_id);
420 if (new_blob == NULL)
421 return -EINVAL;
422 if (expected_size > 0 && expected_size != new_blob->length)
423 return -EINVAL;
424 }
425
426 drm_atomic_replace_property_blob(blob, new_blob, replaced);
427
428 return 0;
429}
430
431/**
432 * drm_atomic_crtc_set_property - set property on CRTC
433 * @crtc: the drm CRTC to set a property on
434 * @state: the state object to update with the new property value
435 * @property: the property to set
436 * @val: the new property value
437 *
438 * Use this instead of calling crtc->atomic_set_property directly.
439 * This function handles generic/core properties and calls out to
440 * driver's ->atomic_set_property() for driver properties. To ensure
441 * consistent behavior you must call this function rather than the
442 * driver hook directly.
443 *
444 * RETURNS:
445 * Zero on success, error code on failure
446 */
447int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
448 struct drm_crtc_state *state, struct drm_property *property,
449 uint64_t val)
450{
451 struct drm_device *dev = crtc->dev;
452 struct drm_mode_config *config = &dev->mode_config;
453 bool replaced = false;
454 int ret;
455
456 if (property == config->prop_active)
457 state->active = val;
458 else if (property == config->prop_mode_id) {
459 struct drm_property_blob *mode =
460 drm_property_lookup_blob(dev, val);
461 ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
462 drm_property_unreference_blob(mode);
463 return ret;
464 } else if (property == config->degamma_lut_property) {
465 ret = drm_atomic_replace_property_blob_from_id(crtc,
466 &state->degamma_lut,
467 val,
468 -1,
469 &replaced);
470 state->color_mgmt_changed = replaced;
471 return ret;
472 } else if (property == config->ctm_property) {
473 ret = drm_atomic_replace_property_blob_from_id(crtc,
474 &state->ctm,
475 val,
476 sizeof(struct drm_color_ctm),
477 &replaced);
478 state->color_mgmt_changed = replaced;
479 return ret;
480 } else if (property == config->gamma_lut_property) {
481 ret = drm_atomic_replace_property_blob_from_id(crtc,
482 &state->gamma_lut,
483 val,
484 -1,
485 &replaced);
486 state->color_mgmt_changed = replaced;
487 return ret;
488 } else if (crtc->funcs->atomic_set_property)
489 return crtc->funcs->atomic_set_property(crtc, state, property, val);
490 else
491 return -EINVAL;
492
493 return 0;
494}
495EXPORT_SYMBOL(drm_atomic_crtc_set_property);
496
497/**
498 * drm_atomic_crtc_get_property - get property value from CRTC state
499 * @crtc: the drm CRTC to set a property on
500 * @state: the state object to get the property value from
501 * @property: the property to set
502 * @val: return location for the property value
503 *
504 * This function handles generic/core properties and calls out to
505 * driver's ->atomic_get_property() for driver properties. To ensure
506 * consistent behavior you must call this function rather than the
507 * driver hook directly.
508 *
509 * RETURNS:
510 * Zero on success, error code on failure
511 */
512static int
513drm_atomic_crtc_get_property(struct drm_crtc *crtc,
514 const struct drm_crtc_state *state,
515 struct drm_property *property, uint64_t *val)
516{
517 struct drm_device *dev = crtc->dev;
518 struct drm_mode_config *config = &dev->mode_config;
519
520 if (property == config->prop_active)
521 *val = state->active;
522 else if (property == config->prop_mode_id)
523 *val = (state->mode_blob) ? state->mode_blob->base.id : 0;
524 else if (property == config->degamma_lut_property)
525 *val = (state->degamma_lut) ? state->degamma_lut->base.id : 0;
526 else if (property == config->ctm_property)
527 *val = (state->ctm) ? state->ctm->base.id : 0;
528 else if (property == config->gamma_lut_property)
529 *val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
530 else if (crtc->funcs->atomic_get_property)
531 return crtc->funcs->atomic_get_property(crtc, state, property, val);
532 else
533 return -EINVAL;
534
535 return 0;
536}
537
538/**
539 * drm_atomic_crtc_check - check crtc state
540 * @crtc: crtc to check
541 * @state: crtc state to check
542 *
543 * Provides core sanity checks for crtc state.
544 *
545 * RETURNS:
546 * Zero on success, error code on failure
547 */
548static int drm_atomic_crtc_check(struct drm_crtc *crtc,
549 struct drm_crtc_state *state)
550{
551 /* NOTE: we explicitly don't enforce constraints such as primary
552 * layer covering entire screen, since that is something we want
553 * to allow (on hw that supports it). For hw that does not, it
554 * should be checked in driver's crtc->atomic_check() vfunc.
555 *
556 * TODO: Add generic modeset state checks once we support those.
557 */
558
559 if (state->active && !state->enable) {
560 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",
561 crtc->base.id, crtc->name);
562 return -EINVAL;
563 }
564
565 /* The state->enable vs. state->mode_blob checks can be WARN_ON,
566 * as this is a kernel-internal detail that userspace should never
567 * be able to trigger. */
568 if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
569 WARN_ON(state->enable && !state->mode_blob)) {
570 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",
571 crtc->base.id, crtc->name);
572 return -EINVAL;
573 }
574
575 if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
576 WARN_ON(!state->enable && state->mode_blob)) {
577 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",
578 crtc->base.id, crtc->name);
579 return -EINVAL;
580 }
581
582 /*
583 * Reject event generation for when a CRTC is off and stays off.
584 * It wouldn't be hard to implement this, but userspace has a track
585 * record of happily burning through 100% cpu (or worse, crash) when the
586 * display pipe is suspended. To avoid all that fun just reject updates
587 * that ask for events since likely that indicates a bug in the
588 * compositor's drawing loop. This is consistent with the vblank IOCTL
589 * and legacy page_flip IOCTL which also reject service on a disabled
590 * pipe.
591 */
592 if (state->event && !state->active && !crtc->state->active) {
593 DRM_DEBUG_ATOMIC("[CRTC:%d] requesting event but off\n",
594 crtc->base.id);
595 return -EINVAL;
596 }
597
598 return 0;
599}
600
601/**
602 * drm_atomic_get_plane_state - get plane state
603 * @state: global atomic state object
604 * @plane: plane to get state object for
605 *
606 * This function returns the plane state for the given plane, allocating it if
607 * needed. It will also grab the relevant plane lock to make sure that the state
608 * is consistent.
609 *
610 * Returns:
611 *
612 * Either the allocated state or the error code encoded into the pointer. When
613 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
614 * entire atomic sequence must be restarted. All other errors are fatal.
615 */
616struct drm_plane_state *
617drm_atomic_get_plane_state(struct drm_atomic_state *state,
618 struct drm_plane *plane)
619{
620 int ret, index = drm_plane_index(plane);
621 struct drm_plane_state *plane_state;
622
623 plane_state = drm_atomic_get_existing_plane_state(state, plane);
624 if (plane_state)
625 return plane_state;
626
627 ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
628 if (ret)
629 return ERR_PTR(ret);
630
631 plane_state = plane->funcs->atomic_duplicate_state(plane);
632 if (!plane_state)
633 return ERR_PTR(-ENOMEM);
634
635 state->plane_states[index] = plane_state;
636 state->planes[index] = plane;
637 plane_state->state = state;
638
639 DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
640 plane->base.id, plane->name, plane_state, state);
641
642 if (plane_state->crtc) {
643 struct drm_crtc_state *crtc_state;
644
645 crtc_state = drm_atomic_get_crtc_state(state,
646 plane_state->crtc);
647 if (IS_ERR(crtc_state))
648 return ERR_CAST(crtc_state);
649 }
650
651 return plane_state;
652}
653EXPORT_SYMBOL(drm_atomic_get_plane_state);
654
655/**
656 * drm_atomic_plane_set_property - set property on plane
657 * @plane: the drm plane to set a property on
658 * @state: the state object to update with the new property value
659 * @property: the property to set
660 * @val: the new property value
661 *
662 * Use this instead of calling plane->atomic_set_property directly.
663 * This function handles generic/core properties and calls out to
664 * driver's ->atomic_set_property() for driver properties. To ensure
665 * consistent behavior you must call this function rather than the
666 * driver hook directly.
667 *
668 * RETURNS:
669 * Zero on success, error code on failure
670 */
671int drm_atomic_plane_set_property(struct drm_plane *plane,
672 struct drm_plane_state *state, struct drm_property *property,
673 uint64_t val)
674{
675 struct drm_device *dev = plane->dev;
676 struct drm_mode_config *config = &dev->mode_config;
677
678 if (property == config->prop_fb_id) {
679 struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
680 drm_atomic_set_fb_for_plane(state, fb);
681 if (fb)
682 drm_framebuffer_unreference(fb);
683 } else if (property == config->prop_crtc_id) {
684 struct drm_crtc *crtc = drm_crtc_find(dev, val);
685 return drm_atomic_set_crtc_for_plane(state, crtc);
686 } else if (property == config->prop_crtc_x) {
687 state->crtc_x = U642I64(val);
688 } else if (property == config->prop_crtc_y) {
689 state->crtc_y = U642I64(val);
690 } else if (property == config->prop_crtc_w) {
691 state->crtc_w = val;
692 } else if (property == config->prop_crtc_h) {
693 state->crtc_h = val;
694 } else if (property == config->prop_src_x) {
695 state->src_x = val;
696 } else if (property == config->prop_src_y) {
697 state->src_y = val;
698 } else if (property == config->prop_src_w) {
699 state->src_w = val;
700 } else if (property == config->prop_src_h) {
701 state->src_h = val;
702 } else if (property == config->rotation_property) {
703 state->rotation = val;
704 } else if (plane->funcs->atomic_set_property) {
705 return plane->funcs->atomic_set_property(plane, state,
706 property, val);
707 } else {
708 return -EINVAL;
709 }
710
711 return 0;
712}
713EXPORT_SYMBOL(drm_atomic_plane_set_property);
714
715/**
716 * drm_atomic_plane_get_property - get property value from plane state
717 * @plane: the drm plane to set a property on
718 * @state: the state object to get the property value from
719 * @property: the property to set
720 * @val: return location for the property value
721 *
722 * This function handles generic/core properties and calls out to
723 * driver's ->atomic_get_property() for driver properties. To ensure
724 * consistent behavior you must call this function rather than the
725 * driver hook directly.
726 *
727 * RETURNS:
728 * Zero on success, error code on failure
729 */
730static int
731drm_atomic_plane_get_property(struct drm_plane *plane,
732 const struct drm_plane_state *state,
733 struct drm_property *property, uint64_t *val)
734{
735 struct drm_device *dev = plane->dev;
736 struct drm_mode_config *config = &dev->mode_config;
737
738 if (property == config->prop_fb_id) {
739 *val = (state->fb) ? state->fb->base.id : 0;
740 } else if (property == config->prop_crtc_id) {
741 *val = (state->crtc) ? state->crtc->base.id : 0;
742 } else if (property == config->prop_crtc_x) {
743 *val = I642U64(state->crtc_x);
744 } else if (property == config->prop_crtc_y) {
745 *val = I642U64(state->crtc_y);
746 } else if (property == config->prop_crtc_w) {
747 *val = state->crtc_w;
748 } else if (property == config->prop_crtc_h) {
749 *val = state->crtc_h;
750 } else if (property == config->prop_src_x) {
751 *val = state->src_x;
752 } else if (property == config->prop_src_y) {
753 *val = state->src_y;
754 } else if (property == config->prop_src_w) {
755 *val = state->src_w;
756 } else if (property == config->prop_src_h) {
757 *val = state->src_h;
758 } else if (property == config->rotation_property) {
759 *val = state->rotation;
760 } else if (plane->funcs->atomic_get_property) {
761 return plane->funcs->atomic_get_property(plane, state, property, val);
762 } else {
763 return -EINVAL;
764 }
765
766 return 0;
767}
768
769static bool
770plane_switching_crtc(struct drm_atomic_state *state,
771 struct drm_plane *plane,
772 struct drm_plane_state *plane_state)
773{
774 if (!plane->state->crtc || !plane_state->crtc)
775 return false;
776
777 if (plane->state->crtc == plane_state->crtc)
778 return false;
779
780 /* This could be refined, but currently there's no helper or driver code
781 * to implement direct switching of active planes nor userspace to take
782 * advantage of more direct plane switching without the intermediate
783 * full OFF state.
784 */
785 return true;
786}
787
788/**
789 * drm_atomic_plane_check - check plane state
790 * @plane: plane to check
791 * @state: plane state to check
792 *
793 * Provides core sanity checks for plane state.
794 *
795 * RETURNS:
796 * Zero on success, error code on failure
797 */
798static int drm_atomic_plane_check(struct drm_plane *plane,
799 struct drm_plane_state *state)
800{
801 unsigned int fb_width, fb_height;
802 int ret;
803
804 /* either *both* CRTC and FB must be set, or neither */
805 if (WARN_ON(state->crtc && !state->fb)) {
806 DRM_DEBUG_ATOMIC("CRTC set but no FB\n");
807 return -EINVAL;
808 } else if (WARN_ON(state->fb && !state->crtc)) {
809 DRM_DEBUG_ATOMIC("FB set but no CRTC\n");
810 return -EINVAL;
811 }
812
813 /* if disabled, we don't care about the rest of the state: */
814 if (!state->crtc)
815 return 0;
816
817 /* Check whether this plane is usable on this CRTC */
818 if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
819 DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");
820 return -EINVAL;
821 }
822
823 /* Check whether this plane supports the fb pixel format. */
824 ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
825 if (ret) {
826 DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
827 drm_get_format_name(state->fb->pixel_format));
828 return ret;
829 }
830
831 /* Give drivers some help against integer overflows */
832 if (state->crtc_w > INT_MAX ||
833 state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
834 state->crtc_h > INT_MAX ||
835 state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
836 DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",
837 state->crtc_w, state->crtc_h,
838 state->crtc_x, state->crtc_y);
839 return -ERANGE;
840 }
841
842 fb_width = state->fb->width << 16;
843 fb_height = state->fb->height << 16;
844
845 /* Make sure source coordinates are inside the fb. */
846 if (state->src_w > fb_width ||
847 state->src_x > fb_width - state->src_w ||
848 state->src_h > fb_height ||
849 state->src_y > fb_height - state->src_h) {
850 DRM_DEBUG_ATOMIC("Invalid source coordinates "
851 "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
852 state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
853 state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
854 state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
855 state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
856 return -ENOSPC;
857 }
858
859 if (plane_switching_crtc(state->state, plane, state)) {
860 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",
861 plane->base.id, plane->name);
862 return -EINVAL;
863 }
864
865 return 0;
866}
867
868/**
869 * drm_atomic_get_connector_state - get connector state
870 * @state: global atomic state object
871 * @connector: connector to get state object for
872 *
873 * This function returns the connector state for the given connector,
874 * allocating it if needed. It will also grab the relevant connector lock to
875 * make sure that the state is consistent.
876 *
877 * Returns:
878 *
879 * Either the allocated state or the error code encoded into the pointer. When
880 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
881 * entire atomic sequence must be restarted. All other errors are fatal.
882 */
883struct drm_connector_state *
884drm_atomic_get_connector_state(struct drm_atomic_state *state,
885 struct drm_connector *connector)
886{
887 int ret, index;
888 struct drm_mode_config *config = &connector->dev->mode_config;
889 struct drm_connector_state *connector_state;
890
891 ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
892 if (ret)
893 return ERR_PTR(ret);
894
895 index = drm_connector_index(connector);
896
897 if (index >= state->num_connector) {
898 struct drm_connector **c;
899 struct drm_connector_state **cs;
900 int alloc = max(index + 1, config->num_connector);
901
902 c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);
903 if (!c)
904 return ERR_PTR(-ENOMEM);
905
906 state->connectors = c;
907 memset(&state->connectors[state->num_connector], 0,
908 sizeof(*state->connectors) * (alloc - state->num_connector));
909
910 cs = krealloc(state->connector_states, alloc * sizeof(*state->connector_states), GFP_KERNEL);
911 if (!cs)
912 return ERR_PTR(-ENOMEM);
913
914 state->connector_states = cs;
915 memset(&state->connector_states[state->num_connector], 0,
916 sizeof(*state->connector_states) * (alloc - state->num_connector));
917 state->num_connector = alloc;
918 }
919
920 if (state->connector_states[index])
921 return state->connector_states[index];
922
923 connector_state = connector->funcs->atomic_duplicate_state(connector);
924 if (!connector_state)
925 return ERR_PTR(-ENOMEM);
926
927 state->connector_states[index] = connector_state;
928 state->connectors[index] = connector;
929 connector_state->state = state;
930
931 DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",
932 connector->base.id, connector_state, state);
933
934 if (connector_state->crtc) {
935 struct drm_crtc_state *crtc_state;
936
937 crtc_state = drm_atomic_get_crtc_state(state,
938 connector_state->crtc);
939 if (IS_ERR(crtc_state))
940 return ERR_CAST(crtc_state);
941 }
942
943 return connector_state;
944}
945EXPORT_SYMBOL(drm_atomic_get_connector_state);
946
947/**
948 * drm_atomic_connector_set_property - set property on connector.
949 * @connector: the drm connector to set a property on
950 * @state: the state object to update with the new property value
951 * @property: the property to set
952 * @val: the new property value
953 *
954 * Use this instead of calling connector->atomic_set_property directly.
955 * This function handles generic/core properties and calls out to
956 * driver's ->atomic_set_property() for driver properties. To ensure
957 * consistent behavior you must call this function rather than the
958 * driver hook directly.
959 *
960 * RETURNS:
961 * Zero on success, error code on failure
962 */
963int drm_atomic_connector_set_property(struct drm_connector *connector,
964 struct drm_connector_state *state, struct drm_property *property,
965 uint64_t val)
966{
967 struct drm_device *dev = connector->dev;
968 struct drm_mode_config *config = &dev->mode_config;
969
970 if (property == config->prop_crtc_id) {
971 struct drm_crtc *crtc = drm_crtc_find(dev, val);
972 return drm_atomic_set_crtc_for_connector(state, crtc);
973 } else if (property == config->dpms_property) {
974 /* setting DPMS property requires special handling, which
975 * is done in legacy setprop path for us. Disallow (for
976 * now?) atomic writes to DPMS property:
977 */
978 return -EINVAL;
979 } else if (connector->funcs->atomic_set_property) {
980 return connector->funcs->atomic_set_property(connector,
981 state, property, val);
982 } else {
983 return -EINVAL;
984 }
985}
986EXPORT_SYMBOL(drm_atomic_connector_set_property);
987
988/**
989 * drm_atomic_connector_get_property - get property value from connector state
990 * @connector: the drm connector to set a property on
991 * @state: the state object to get the property value from
992 * @property: the property to set
993 * @val: return location for the property value
994 *
995 * This function handles generic/core properties and calls out to
996 * driver's ->atomic_get_property() for driver properties. To ensure
997 * consistent behavior you must call this function rather than the
998 * driver hook directly.
999 *
1000 * RETURNS:
1001 * Zero on success, error code on failure
1002 */
1003static int
1004drm_atomic_connector_get_property(struct drm_connector *connector,
1005 const struct drm_connector_state *state,
1006 struct drm_property *property, uint64_t *val)
1007{
1008 struct drm_device *dev = connector->dev;
1009 struct drm_mode_config *config = &dev->mode_config;
1010
1011 if (property == config->prop_crtc_id) {
1012 *val = (state->crtc) ? state->crtc->base.id : 0;
1013 } else if (property == config->dpms_property) {
1014 *val = connector->dpms;
1015 } else if (connector->funcs->atomic_get_property) {
1016 return connector->funcs->atomic_get_property(connector,
1017 state, property, val);
1018 } else {
1019 return -EINVAL;
1020 }
1021
1022 return 0;
1023}
1024
1025int drm_atomic_get_property(struct drm_mode_object *obj,
1026 struct drm_property *property, uint64_t *val)
1027{
1028 struct drm_device *dev = property->dev;
1029 int ret;
1030
1031 switch (obj->type) {
1032 case DRM_MODE_OBJECT_CONNECTOR: {
1033 struct drm_connector *connector = obj_to_connector(obj);
1034 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
1035 ret = drm_atomic_connector_get_property(connector,
1036 connector->state, property, val);
1037 break;
1038 }
1039 case DRM_MODE_OBJECT_CRTC: {
1040 struct drm_crtc *crtc = obj_to_crtc(obj);
1041 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
1042 ret = drm_atomic_crtc_get_property(crtc,
1043 crtc->state, property, val);
1044 break;
1045 }
1046 case DRM_MODE_OBJECT_PLANE: {
1047 struct drm_plane *plane = obj_to_plane(obj);
1048 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
1049 ret = drm_atomic_plane_get_property(plane,
1050 plane->state, property, val);
1051 break;
1052 }
1053 default:
1054 ret = -EINVAL;
1055 break;
1056 }
1057
1058 return ret;
1059}
1060
1061/**
1062 * drm_atomic_set_crtc_for_plane - set crtc for plane
1063 * @plane_state: the plane whose incoming state to update
1064 * @crtc: crtc to use for the plane
1065 *
1066 * Changing the assigned crtc for a plane requires us to grab the lock and state
1067 * for the new crtc, as needed. This function takes care of all these details
1068 * besides updating the pointer in the state object itself.
1069 *
1070 * Returns:
1071 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1072 * then the w/w mutex code has detected a deadlock and the entire atomic
1073 * sequence must be restarted. All other errors are fatal.
1074 */
1075int
1076drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
1077 struct drm_crtc *crtc)
1078{
1079 struct drm_plane *plane = plane_state->plane;
1080 struct drm_crtc_state *crtc_state;
1081
1082 if (plane_state->crtc) {
1083 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
1084 plane_state->crtc);
1085 if (WARN_ON(IS_ERR(crtc_state)))
1086 return PTR_ERR(crtc_state);
1087
1088 crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));
1089 }
1090
1091 plane_state->crtc = crtc;
1092
1093 if (crtc) {
1094 crtc_state = drm_atomic_get_crtc_state(plane_state->state,
1095 crtc);
1096 if (IS_ERR(crtc_state))
1097 return PTR_ERR(crtc_state);
1098 crtc_state->plane_mask |= (1 << drm_plane_index(plane));
1099 }
1100
1101 if (crtc)
1102 DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d:%s]\n",
1103 plane_state, crtc->base.id, crtc->name);
1104 else
1105 DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",
1106 plane_state);
1107
1108 return 0;
1109}
1110EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
1111
1112/**
1113 * drm_atomic_set_fb_for_plane - set framebuffer for plane
1114 * @plane_state: atomic state object for the plane
1115 * @fb: fb to use for the plane
1116 *
1117 * Changing the assigned framebuffer for a plane requires us to grab a reference
1118 * to the new fb and drop the reference to the old fb, if there is one. This
1119 * function takes care of all these details besides updating the pointer in the
1120 * state object itself.
1121 */
1122void
1123drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
1124 struct drm_framebuffer *fb)
1125{
1126 if (plane_state->fb)
1127 drm_framebuffer_unreference(plane_state->fb);
1128 if (fb)
1129 drm_framebuffer_reference(fb);
1130 plane_state->fb = fb;
1131
1132 if (fb)
1133 DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n",
1134 fb->base.id, plane_state);
1135 else
1136 DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n",
1137 plane_state);
1138}
1139EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
1140
1141/**
1142 * drm_atomic_set_crtc_for_connector - set crtc for connector
1143 * @conn_state: atomic state object for the connector
1144 * @crtc: crtc to use for the connector
1145 *
1146 * Changing the assigned crtc for a connector requires us to grab the lock and
1147 * state for the new crtc, as needed. This function takes care of all these
1148 * details besides updating the pointer in the state object itself.
1149 *
1150 * Returns:
1151 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1152 * then the w/w mutex code has detected a deadlock and the entire atomic
1153 * sequence must be restarted. All other errors are fatal.
1154 */
1155int
1156drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
1157 struct drm_crtc *crtc)
1158{
1159 struct drm_crtc_state *crtc_state;
1160
1161 if (conn_state->crtc && conn_state->crtc != crtc) {
1162 crtc_state = drm_atomic_get_existing_crtc_state(conn_state->state,
1163 conn_state->crtc);
1164
1165 crtc_state->connector_mask &=
1166 ~(1 << drm_connector_index(conn_state->connector));
1167 }
1168
1169 if (crtc) {
1170 crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
1171 if (IS_ERR(crtc_state))
1172 return PTR_ERR(crtc_state);
1173
1174 crtc_state->connector_mask |=
1175 1 << drm_connector_index(conn_state->connector);
1176 }
1177
1178 conn_state->crtc = crtc;
1179
1180 if (crtc)
1181 DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d:%s]\n",
1182 conn_state, crtc->base.id, crtc->name);
1183 else
1184 DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
1185 conn_state);
1186
1187 return 0;
1188}
1189EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
1190
1191/**
1192 * drm_atomic_add_affected_connectors - add connectors for crtc
1193 * @state: atomic state
1194 * @crtc: DRM crtc
1195 *
1196 * This function walks the current configuration and adds all connectors
1197 * currently using @crtc to the atomic configuration @state. Note that this
1198 * function must acquire the connection mutex. This can potentially cause
1199 * unneeded seralization if the update is just for the planes on one crtc. Hence
1200 * drivers and helpers should only call this when really needed (e.g. when a
1201 * full modeset needs to happen due to some change).
1202 *
1203 * Returns:
1204 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1205 * then the w/w mutex code has detected a deadlock and the entire atomic
1206 * sequence must be restarted. All other errors are fatal.
1207 */
1208int
1209drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
1210 struct drm_crtc *crtc)
1211{
1212 struct drm_mode_config *config = &state->dev->mode_config;
1213 struct drm_connector *connector;
1214 struct drm_connector_state *conn_state;
1215 int ret;
1216
1217 ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
1218 if (ret)
1219 return ret;
1220
1221 DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n",
1222 crtc->base.id, crtc->name, state);
1223
1224 /*
1225 * Changed connectors are already in @state, so only need to look at the
1226 * current configuration.
1227 */
1228 drm_for_each_connector(connector, state->dev) {
1229 if (connector->state->crtc != crtc)
1230 continue;
1231
1232 conn_state = drm_atomic_get_connector_state(state, connector);
1233 if (IS_ERR(conn_state))
1234 return PTR_ERR(conn_state);
1235 }
1236
1237 return 0;
1238}
1239EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
1240
1241/**
1242 * drm_atomic_add_affected_planes - add planes for crtc
1243 * @state: atomic state
1244 * @crtc: DRM crtc
1245 *
1246 * This function walks the current configuration and adds all planes
1247 * currently used by @crtc to the atomic configuration @state. This is useful
1248 * when an atomic commit also needs to check all currently enabled plane on
1249 * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
1250 * to avoid special code to force-enable all planes.
1251 *
1252 * Since acquiring a plane state will always also acquire the w/w mutex of the
1253 * current CRTC for that plane (if there is any) adding all the plane states for
1254 * a CRTC will not reduce parallism of atomic updates.
1255 *
1256 * Returns:
1257 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
1258 * then the w/w mutex code has detected a deadlock and the entire atomic
1259 * sequence must be restarted. All other errors are fatal.
1260 */
1261int
1262drm_atomic_add_affected_planes(struct drm_atomic_state *state,
1263 struct drm_crtc *crtc)
1264{
1265 struct drm_plane *plane;
1266
1267 WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc));
1268
1269 drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) {
1270 struct drm_plane_state *plane_state =
1271 drm_atomic_get_plane_state(state, plane);
1272
1273 if (IS_ERR(plane_state))
1274 return PTR_ERR(plane_state);
1275 }
1276 return 0;
1277}
1278EXPORT_SYMBOL(drm_atomic_add_affected_planes);
1279
1280/**
1281 * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
1282 * @state: atomic state
1283 *
1284 * This function should be used by legacy entry points which don't understand
1285 * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
1286 * the slowpath completed.
1287 */
1288void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
1289{
1290 int ret;
1291
1292retry:
1293 drm_modeset_backoff(state->acquire_ctx);
1294
1295 ret = drm_modeset_lock_all_ctx(state->dev, state->acquire_ctx);
1296 if (ret)
1297 goto retry;
1298}
1299EXPORT_SYMBOL(drm_atomic_legacy_backoff);
1300
1301/**
1302 * drm_atomic_check_only - check whether a given config would work
1303 * @state: atomic configuration to check
1304 *
1305 * Note that this function can return -EDEADLK if the driver needed to acquire
1306 * more locks but encountered a deadlock. The caller must then do the usual w/w
1307 * backoff dance and restart. All other errors are fatal.
1308 *
1309 * Returns:
1310 * 0 on success, negative error code on failure.
1311 */
1312int drm_atomic_check_only(struct drm_atomic_state *state)
1313{
1314 struct drm_device *dev = state->dev;
1315 struct drm_mode_config *config = &dev->mode_config;
1316 struct drm_plane *plane;
1317 struct drm_plane_state *plane_state;
1318 struct drm_crtc *crtc;
1319 struct drm_crtc_state *crtc_state;
1320 int i, ret = 0;
1321
1322 DRM_DEBUG_ATOMIC("checking %p\n", state);
1323
1324 for_each_plane_in_state(state, plane, plane_state, i) {
1325 ret = drm_atomic_plane_check(plane, plane_state);
1326 if (ret) {
1327 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n",
1328 plane->base.id, plane->name);
1329 return ret;
1330 }
1331 }
1332
1333 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1334 ret = drm_atomic_crtc_check(crtc, crtc_state);
1335 if (ret) {
1336 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
1337 crtc->base.id, crtc->name);
1338 return ret;
1339 }
1340 }
1341
1342 if (config->funcs->atomic_check)
1343 ret = config->funcs->atomic_check(state->dev, state);
1344
1345 if (!state->allow_modeset) {
1346 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1347 if (drm_atomic_crtc_needs_modeset(crtc_state)) {
1348 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
1349 crtc->base.id, crtc->name);
1350 return -EINVAL;
1351 }
1352 }
1353 }
1354
1355 return ret;
1356}
1357EXPORT_SYMBOL(drm_atomic_check_only);
1358
1359/**
1360 * drm_atomic_commit - commit configuration atomically
1361 * @state: atomic configuration to check
1362 *
1363 * Note that this function can return -EDEADLK if the driver needed to acquire
1364 * more locks but encountered a deadlock. The caller must then do the usual w/w
1365 * backoff dance and restart. All other errors are fatal.
1366 *
1367 * Also note that on successful execution ownership of @state is transferred
1368 * from the caller of this function to the function itself. The caller must not
1369 * free or in any other way access @state. If the function fails then the caller
1370 * must clean up @state itself.
1371 *
1372 * Returns:
1373 * 0 on success, negative error code on failure.
1374 */
1375int drm_atomic_commit(struct drm_atomic_state *state)
1376{
1377 struct drm_mode_config *config = &state->dev->mode_config;
1378 int ret;
1379
1380 ret = drm_atomic_check_only(state);
1381 if (ret)
1382 return ret;
1383
1384 DRM_DEBUG_ATOMIC("commiting %p\n", state);
1385
1386 return config->funcs->atomic_commit(state->dev, state, false);
1387}
1388EXPORT_SYMBOL(drm_atomic_commit);
1389
1390/**
1391 * drm_atomic_async_commit - atomic&async configuration commit
1392 * @state: atomic configuration to check
1393 *
1394 * Note that this function can return -EDEADLK if the driver needed to acquire
1395 * more locks but encountered a deadlock. The caller must then do the usual w/w
1396 * backoff dance and restart. All other errors are fatal.
1397 *
1398 * Also note that on successful execution ownership of @state is transferred
1399 * from the caller of this function to the function itself. The caller must not
1400 * free or in any other way access @state. If the function fails then the caller
1401 * must clean up @state itself.
1402 *
1403 * Returns:
1404 * 0 on success, negative error code on failure.
1405 */
1406int drm_atomic_async_commit(struct drm_atomic_state *state)
1407{
1408 struct drm_mode_config *config = &state->dev->mode_config;
1409 int ret;
1410
1411 ret = drm_atomic_check_only(state);
1412 if (ret)
1413 return ret;
1414
1415 DRM_DEBUG_ATOMIC("commiting %p asynchronously\n", state);
1416
1417 return config->funcs->atomic_commit(state->dev, state, true);
1418}
1419EXPORT_SYMBOL(drm_atomic_async_commit);
1420
1421/*
1422 * The big monstor ioctl
1423 */
1424
1425static struct drm_pending_vblank_event *create_vblank_event(
1426 struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
1427{
1428 struct drm_pending_vblank_event *e = NULL;
1429 int ret;
1430
1431 e = kzalloc(sizeof *e, GFP_KERNEL);
1432 if (!e)
1433 return NULL;
1434
1435 e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
1436 e->event.base.length = sizeof(e->event);
1437 e->event.user_data = user_data;
1438
1439 ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
1440 if (ret) {
1441 kfree(e);
1442 return NULL;
1443 }
1444
1445 return e;
1446}
1447
1448static int atomic_set_prop(struct drm_atomic_state *state,
1449 struct drm_mode_object *obj, struct drm_property *prop,
1450 uint64_t prop_value)
1451{
1452 struct drm_mode_object *ref;
1453 int ret;
1454
1455 if (!drm_property_change_valid_get(prop, prop_value, &ref))
1456 return -EINVAL;
1457
1458 switch (obj->type) {
1459 case DRM_MODE_OBJECT_CONNECTOR: {
1460 struct drm_connector *connector = obj_to_connector(obj);
1461 struct drm_connector_state *connector_state;
1462
1463 connector_state = drm_atomic_get_connector_state(state, connector);
1464 if (IS_ERR(connector_state)) {
1465 ret = PTR_ERR(connector_state);
1466 break;
1467 }
1468
1469 ret = drm_atomic_connector_set_property(connector,
1470 connector_state, prop, prop_value);
1471 break;
1472 }
1473 case DRM_MODE_OBJECT_CRTC: {
1474 struct drm_crtc *crtc = obj_to_crtc(obj);
1475 struct drm_crtc_state *crtc_state;
1476
1477 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1478 if (IS_ERR(crtc_state)) {
1479 ret = PTR_ERR(crtc_state);
1480 break;
1481 }
1482
1483 ret = drm_atomic_crtc_set_property(crtc,
1484 crtc_state, prop, prop_value);
1485 break;
1486 }
1487 case DRM_MODE_OBJECT_PLANE: {
1488 struct drm_plane *plane = obj_to_plane(obj);
1489 struct drm_plane_state *plane_state;
1490
1491 plane_state = drm_atomic_get_plane_state(state, plane);
1492 if (IS_ERR(plane_state)) {
1493 ret = PTR_ERR(plane_state);
1494 break;
1495 }
1496
1497 ret = drm_atomic_plane_set_property(plane,
1498 plane_state, prop, prop_value);
1499 break;
1500 }
1501 default:
1502 ret = -EINVAL;
1503 break;
1504 }
1505
1506 drm_property_change_valid_put(prop, ref);
1507 return ret;
1508}
1509
1510/**
1511 * drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers.
1512 *
1513 * @dev: drm device to check.
1514 * @plane_mask: plane mask for planes that were updated.
1515 * @ret: return value, can be -EDEADLK for a retry.
1516 *
1517 * Before doing an update plane->old_fb is set to plane->fb,
1518 * but before dropping the locks old_fb needs to be set to NULL
1519 * and plane->fb updated. This is a common operation for each
1520 * atomic update, so this call is split off as a helper.
1521 */
1522void drm_atomic_clean_old_fb(struct drm_device *dev,
1523 unsigned plane_mask,
1524 int ret)
1525{
1526 struct drm_plane *plane;
1527
1528 /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
1529 * locks (ie. while it is still safe to deref plane->state). We
1530 * need to do this here because the driver entry points cannot
1531 * distinguish between legacy and atomic ioctls.
1532 */
1533 drm_for_each_plane_mask(plane, dev, plane_mask) {
1534 if (ret == 0) {
1535 struct drm_framebuffer *new_fb = plane->state->fb;
1536 if (new_fb)
1537 drm_framebuffer_reference(new_fb);
1538 plane->fb = new_fb;
1539 plane->crtc = plane->state->crtc;
1540
1541 if (plane->old_fb)
1542 drm_framebuffer_unreference(plane->old_fb);
1543 }
1544 plane->old_fb = NULL;
1545 }
1546}
1547EXPORT_SYMBOL(drm_atomic_clean_old_fb);
1548
1549int drm_mode_atomic_ioctl(struct drm_device *dev,
1550 void *data, struct drm_file *file_priv)
1551{
1552 struct drm_mode_atomic *arg = data;
1553 uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
1554 uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
1555 uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
1556 uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
1557 unsigned int copied_objs, copied_props;
1558 struct drm_atomic_state *state;
1559 struct drm_modeset_acquire_ctx ctx;
1560 struct drm_plane *plane;
1561 struct drm_crtc *crtc;
1562 struct drm_crtc_state *crtc_state;
1563 unsigned plane_mask;
1564 int ret = 0;
1565 unsigned int i, j;
1566
1567 /* disallow for drivers not supporting atomic: */
1568 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
1569 return -EINVAL;
1570
1571 /* disallow for userspace that has not enabled atomic cap (even
1572 * though this may be a bit overkill, since legacy userspace
1573 * wouldn't know how to call this ioctl)
1574 */
1575 if (!file_priv->atomic)
1576 return -EINVAL;
1577
1578 if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
1579 return -EINVAL;
1580
1581 if (arg->reserved)
1582 return -EINVAL;
1583
1584 if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
1585 !dev->mode_config.async_page_flip)
1586 return -EINVAL;
1587
1588 /* can't test and expect an event at the same time. */
1589 if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
1590 (arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
1591 return -EINVAL;
1592
1593 drm_modeset_acquire_init(&ctx, 0);
1594
1595 state = drm_atomic_state_alloc(dev);
1596 if (!state)
1597 return -ENOMEM;
1598
1599 state->acquire_ctx = &ctx;
1600 state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
1601
1602retry:
1603 plane_mask = 0;
1604 copied_objs = 0;
1605 copied_props = 0;
1606
1607 for (i = 0; i < arg->count_objs; i++) {
1608 uint32_t obj_id, count_props;
1609 struct drm_mode_object *obj;
1610
1611 if (get_user(obj_id, objs_ptr + copied_objs)) {
1612 ret = -EFAULT;
1613 goto out;
1614 }
1615
1616 obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
1617 if (!obj || !obj->properties) {
1618 ret = -ENOENT;
1619 goto out;
1620 }
1621
1622 if (get_user(count_props, count_props_ptr + copied_objs)) {
1623 ret = -EFAULT;
1624 goto out;
1625 }
1626
1627 copied_objs++;
1628
1629 for (j = 0; j < count_props; j++) {
1630 uint32_t prop_id;
1631 uint64_t prop_value;
1632 struct drm_property *prop;
1633
1634 if (get_user(prop_id, props_ptr + copied_props)) {
1635 ret = -EFAULT;
1636 goto out;
1637 }
1638
1639 prop = drm_property_find(dev, prop_id);
1640 if (!prop) {
1641 ret = -ENOENT;
1642 goto out;
1643 }
1644
1645 if (copy_from_user(&prop_value,
1646 prop_values_ptr + copied_props,
1647 sizeof(prop_value))) {
1648 ret = -EFAULT;
1649 goto out;
1650 }
1651
1652 ret = atomic_set_prop(state, obj, prop, prop_value);
1653 if (ret)
1654 goto out;
1655
1656 copied_props++;
1657 }
1658
1659 if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
1660 !(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
1661 plane = obj_to_plane(obj);
1662 plane_mask |= (1 << drm_plane_index(plane));
1663 plane->old_fb = plane->fb;
1664 }
1665 }
1666
1667 if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1668 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1669 struct drm_pending_vblank_event *e;
1670
1671 e = create_vblank_event(dev, file_priv, arg->user_data);
1672 if (!e) {
1673 ret = -ENOMEM;
1674 goto out;
1675 }
1676
1677 crtc_state->event = e;
1678 }
1679 }
1680
1681 if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
1682 /*
1683 * Unlike commit, check_only does not clean up state.
1684 * Below we call drm_atomic_state_free for it.
1685 */
1686 ret = drm_atomic_check_only(state);
1687 } else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
1688 ret = drm_atomic_async_commit(state);
1689 } else {
1690 ret = drm_atomic_commit(state);
1691 }
1692
1693out:
1694 drm_atomic_clean_old_fb(dev, plane_mask, ret);
1695
1696 if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
1697 /*
1698 * TEST_ONLY and PAGE_FLIP_EVENT are mutually exclusive,
1699 * if they weren't, this code should be called on success
1700 * for TEST_ONLY too.
1701 */
1702
1703 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1704 if (!crtc_state->event)
1705 continue;
1706
1707 drm_event_cancel_free(dev, &crtc_state->event->base);
1708 }
1709 }
1710
1711 if (ret == -EDEADLK) {
1712 drm_atomic_state_clear(state);
1713 drm_modeset_backoff(&ctx);
1714 goto retry;
1715 }
1716
1717 if (ret || arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)
1718 drm_atomic_state_free(state);
1719
1720 drm_modeset_drop_locks(&ctx);
1721 drm_modeset_acquire_fini(&ctx);
1722
1723 return ret;
1724}