2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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.
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
30 #include <drm/drm_atomic.h>
31 #include <drm/drm_plane_helper.h>
33 static void kfree_state(struct drm_atomic_state
*state
)
35 kfree(state
->connectors
);
36 kfree(state
->connector_states
);
38 kfree(state
->crtc_states
);
40 kfree(state
->plane_states
);
45 * drm_atomic_state_alloc - allocate atomic state
48 * This allocates an empty atomic state to track updates.
50 struct drm_atomic_state
*
51 drm_atomic_state_alloc(struct drm_device
*dev
)
53 struct drm_atomic_state
*state
;
55 state
= kzalloc(sizeof(*state
), GFP_KERNEL
);
59 state
->num_connector
= ACCESS_ONCE(dev
->mode_config
.num_connector
);
61 state
->crtcs
= kcalloc(dev
->mode_config
.num_crtc
,
62 sizeof(*state
->crtcs
), GFP_KERNEL
);
65 state
->crtc_states
= kcalloc(dev
->mode_config
.num_crtc
,
66 sizeof(*state
->crtc_states
), GFP_KERNEL
);
67 if (!state
->crtc_states
)
69 state
->planes
= kcalloc(dev
->mode_config
.num_total_plane
,
70 sizeof(*state
->planes
), GFP_KERNEL
);
73 state
->plane_states
= kcalloc(dev
->mode_config
.num_total_plane
,
74 sizeof(*state
->plane_states
), GFP_KERNEL
);
75 if (!state
->plane_states
)
77 state
->connectors
= kcalloc(state
->num_connector
,
78 sizeof(*state
->connectors
),
80 if (!state
->connectors
)
82 state
->connector_states
= kcalloc(state
->num_connector
,
83 sizeof(*state
->connector_states
),
85 if (!state
->connector_states
)
90 DRM_DEBUG_KMS("Allocate atomic state %p\n", state
);
98 EXPORT_SYMBOL(drm_atomic_state_alloc
);
101 * drm_atomic_state_clear - clear state object
102 * @state: atomic state
104 * When the w/w mutex algorithm detects a deadlock we need to back off and drop
105 * all locks. So someone else could sneak in and change the current modeset
106 * configuration. Which means that all the state assembled in @state is no
107 * longer an atomic update to the current state, but to some arbitrary earlier
108 * state. Which could break assumptions the driver's ->atomic_check likely
111 * Hence we must clear all cached state and completely start over, using this
114 void drm_atomic_state_clear(struct drm_atomic_state
*state
)
116 struct drm_device
*dev
= state
->dev
;
117 struct drm_mode_config
*config
= &dev
->mode_config
;
120 DRM_DEBUG_KMS("Clearing atomic state %p\n", state
);
122 for (i
= 0; i
< state
->num_connector
; i
++) {
123 struct drm_connector
*connector
= state
->connectors
[i
];
128 WARN_ON(!drm_modeset_is_locked(&config
->connection_mutex
));
130 connector
->funcs
->atomic_destroy_state(connector
,
131 state
->connector_states
[i
]);
134 for (i
= 0; i
< config
->num_crtc
; i
++) {
135 struct drm_crtc
*crtc
= state
->crtcs
[i
];
140 crtc
->funcs
->atomic_destroy_state(crtc
,
141 state
->crtc_states
[i
]);
144 for (i
= 0; i
< config
->num_total_plane
; i
++) {
145 struct drm_plane
*plane
= state
->planes
[i
];
150 plane
->funcs
->atomic_destroy_state(plane
,
151 state
->plane_states
[i
]);
154 EXPORT_SYMBOL(drm_atomic_state_clear
);
157 * drm_atomic_state_free - free all memory for an atomic state
158 * @state: atomic state to deallocate
160 * This frees all memory associated with an atomic state, including all the
161 * per-object state for planes, crtcs and connectors.
163 void drm_atomic_state_free(struct drm_atomic_state
*state
)
165 drm_atomic_state_clear(state
);
167 DRM_DEBUG_KMS("Freeing atomic state %p\n", state
);
171 EXPORT_SYMBOL(drm_atomic_state_free
);
174 * drm_atomic_get_crtc_state - get crtc state
175 * @state: global atomic state object
176 * @crtc: crtc to get state object for
178 * This function returns the crtc state for the given crtc, allocating it if
179 * needed. It will also grab the relevant crtc lock to make sure that the state
184 * Either the allocated state or the error code encoded into the pointer. When
185 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
186 * entire atomic sequence must be restarted. All other errors are fatal.
188 struct drm_crtc_state
*
189 drm_atomic_get_crtc_state(struct drm_atomic_state
*state
,
190 struct drm_crtc
*crtc
)
193 struct drm_crtc_state
*crtc_state
;
195 index
= drm_crtc_index(crtc
);
197 if (state
->crtc_states
[index
])
198 return state
->crtc_states
[index
];
200 ret
= drm_modeset_lock(&crtc
->mutex
, state
->acquire_ctx
);
204 crtc_state
= crtc
->funcs
->atomic_duplicate_state(crtc
);
206 return ERR_PTR(-ENOMEM
);
208 state
->crtc_states
[index
] = crtc_state
;
209 state
->crtcs
[index
] = crtc
;
210 crtc_state
->state
= state
;
212 DRM_DEBUG_KMS("Added [CRTC:%d] %p state to %p\n",
213 crtc
->base
.id
, crtc_state
, state
);
217 EXPORT_SYMBOL(drm_atomic_get_crtc_state
);
220 * drm_atomic_get_plane_state - get plane state
221 * @state: global atomic state object
222 * @plane: plane to get state object for
224 * This function returns the plane state for the given plane, allocating it if
225 * needed. It will also grab the relevant plane lock to make sure that the state
230 * Either the allocated state or the error code encoded into the pointer. When
231 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
232 * entire atomic sequence must be restarted. All other errors are fatal.
234 struct drm_plane_state
*
235 drm_atomic_get_plane_state(struct drm_atomic_state
*state
,
236 struct drm_plane
*plane
)
239 struct drm_plane_state
*plane_state
;
241 index
= drm_plane_index(plane
);
243 if (state
->plane_states
[index
])
244 return state
->plane_states
[index
];
247 * TODO: We currently don't have per-plane mutexes. So instead of trying
248 * crazy tricks with deferring plane->crtc and hoping for the best just
249 * grab all crtc locks. Once we have per-plane locks we must update this
250 * to only take the plane mutex.
252 ret
= drm_modeset_lock(&plane
->mutex
, state
->acquire_ctx
);
256 plane_state
= plane
->funcs
->atomic_duplicate_state(plane
);
258 return ERR_PTR(-ENOMEM
);
260 state
->plane_states
[index
] = plane_state
;
261 state
->planes
[index
] = plane
;
262 plane_state
->state
= state
;
264 DRM_DEBUG_KMS("Added [PLANE:%d] %p state to %p\n",
265 plane
->base
.id
, plane_state
, state
);
267 if (plane_state
->crtc
) {
268 struct drm_crtc_state
*crtc_state
;
270 crtc_state
= drm_atomic_get_crtc_state(state
,
272 if (IS_ERR(crtc_state
))
273 return ERR_CAST(crtc_state
);
278 EXPORT_SYMBOL(drm_atomic_get_plane_state
);
281 * drm_atomic_get_connector_state - get connector state
282 * @state: global atomic state object
283 * @connector: connector to get state object for
285 * This function returns the connector state for the given connector,
286 * allocating it if needed. It will also grab the relevant connector lock to
287 * make sure that the state is consistent.
291 * Either the allocated state or the error code encoded into the pointer. When
292 * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
293 * entire atomic sequence must be restarted. All other errors are fatal.
295 struct drm_connector_state
*
296 drm_atomic_get_connector_state(struct drm_atomic_state
*state
,
297 struct drm_connector
*connector
)
300 struct drm_mode_config
*config
= &connector
->dev
->mode_config
;
301 struct drm_connector_state
*connector_state
;
303 ret
= drm_modeset_lock(&config
->connection_mutex
, state
->acquire_ctx
);
307 index
= drm_connector_index(connector
);
310 * Construction of atomic state updates can race with a connector
311 * hot-add which might overflow. In this case flip the table and just
312 * restart the entire ioctl - no one is fast enough to livelock a cpu
313 * with physical hotplug events anyway.
315 * Note that we only grab the indexes once we have the right lock to
316 * prevent hotplug/unplugging of connectors. So removal is no problem,
317 * at most the array is a bit too large.
319 if (index
>= state
->num_connector
) {
320 DRM_DEBUG_KMS("Hot-added connector would overflow state array, restarting\n");
324 if (state
->connector_states
[index
])
325 return state
->connector_states
[index
];
327 connector_state
= connector
->funcs
->atomic_duplicate_state(connector
);
328 if (!connector_state
)
329 return ERR_PTR(-ENOMEM
);
331 state
->connector_states
[index
] = connector_state
;
332 state
->connectors
[index
] = connector
;
333 connector_state
->state
= state
;
335 DRM_DEBUG_KMS("Added [CONNECTOR:%d] %p state to %p\n",
336 connector
->base
.id
, connector_state
, state
);
338 if (connector_state
->crtc
) {
339 struct drm_crtc_state
*crtc_state
;
341 crtc_state
= drm_atomic_get_crtc_state(state
,
342 connector_state
->crtc
);
343 if (IS_ERR(crtc_state
))
344 return ERR_CAST(crtc_state
);
347 return connector_state
;
349 EXPORT_SYMBOL(drm_atomic_get_connector_state
);
352 * drm_atomic_set_crtc_for_plane - set crtc for plane
353 * @plane_state: atomic state object for the plane
354 * @crtc: crtc to use for the plane
356 * Changing the assigned crtc for a plane requires us to grab the lock and state
357 * for the new crtc, as needed. This function takes care of all these details
358 * besides updating the pointer in the state object itself.
361 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
362 * then the w/w mutex code has detected a deadlock and the entire atomic
363 * sequence must be restarted. All other errors are fatal.
366 drm_atomic_set_crtc_for_plane(struct drm_plane_state
*plane_state
,
367 struct drm_crtc
*crtc
)
369 struct drm_crtc_state
*crtc_state
;
372 crtc_state
= drm_atomic_get_crtc_state(plane_state
->state
,
374 if (IS_ERR(crtc_state
))
375 return PTR_ERR(crtc_state
);
378 plane_state
->crtc
= crtc
;
381 DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n",
382 plane_state
, crtc
->base
.id
);
384 DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state
);
388 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane
);
391 * drm_atomic_set_fb_for_plane - set crtc for plane
392 * @plane_state: atomic state object for the plane
393 * @fb: fb to use for the plane
395 * Changing the assigned framebuffer for a plane requires us to grab a reference
396 * to the new fb and drop the reference to the old fb, if there is one. This
397 * function takes care of all these details besides updating the pointer in the
398 * state object itself.
401 drm_atomic_set_fb_for_plane(struct drm_plane_state
*plane_state
,
402 struct drm_framebuffer
*fb
)
405 drm_framebuffer_unreference(plane_state
->fb
);
407 drm_framebuffer_reference(fb
);
408 plane_state
->fb
= fb
;
411 DRM_DEBUG_KMS("Set [FB:%d] for plane state %p\n",
412 fb
->base
.id
, plane_state
);
414 DRM_DEBUG_KMS("Set [NOFB] for plane state %p\n", plane_state
);
416 EXPORT_SYMBOL(drm_atomic_set_fb_for_plane
);
419 * drm_atomic_set_crtc_for_connector - set crtc for connector
420 * @conn_state: atomic state object for the connector
421 * @crtc: crtc to use for the connector
423 * Changing the assigned crtc for a connector requires us to grab the lock and
424 * state for the new crtc, as needed. This function takes care of all these
425 * details besides updating the pointer in the state object itself.
428 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
429 * then the w/w mutex code has detected a deadlock and the entire atomic
430 * sequence must be restarted. All other errors are fatal.
433 drm_atomic_set_crtc_for_connector(struct drm_connector_state
*conn_state
,
434 struct drm_crtc
*crtc
)
436 struct drm_crtc_state
*crtc_state
;
439 crtc_state
= drm_atomic_get_crtc_state(conn_state
->state
, crtc
);
440 if (IS_ERR(crtc_state
))
441 return PTR_ERR(crtc_state
);
444 conn_state
->crtc
= crtc
;
447 DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n",
448 conn_state
, crtc
->base
.id
);
450 DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n",
455 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector
);
458 * drm_atomic_add_affected_connectors - add connectors for crtc
459 * @state: atomic state
462 * This function walks the current configuration and adds all connectors
463 * currently using @crtc to the atomic configuration @state. Note that this
464 * function must acquire the connection mutex. This can potentially cause
465 * unneeded seralization if the update is just for the planes on one crtc. Hence
466 * drivers and helpers should only call this when really needed (e.g. when a
467 * full modeset needs to happen due to some change).
470 * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
471 * then the w/w mutex code has detected a deadlock and the entire atomic
472 * sequence must be restarted. All other errors are fatal.
475 drm_atomic_add_affected_connectors(struct drm_atomic_state
*state
,
476 struct drm_crtc
*crtc
)
478 struct drm_mode_config
*config
= &state
->dev
->mode_config
;
479 struct drm_connector
*connector
;
480 struct drm_connector_state
*conn_state
;
483 ret
= drm_modeset_lock(&config
->connection_mutex
, state
->acquire_ctx
);
487 DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n",
488 crtc
->base
.id
, state
);
491 * Changed connectors are already in @state, so only need to look at the
492 * current configuration.
494 list_for_each_entry(connector
, &config
->connector_list
, head
) {
495 if (connector
->state
->crtc
!= crtc
)
498 conn_state
= drm_atomic_get_connector_state(state
, connector
);
499 if (IS_ERR(conn_state
))
500 return PTR_ERR(conn_state
);
505 EXPORT_SYMBOL(drm_atomic_add_affected_connectors
);
508 * drm_atomic_connectors_for_crtc - count number of connected outputs
509 * @state: atomic state
512 * This function counts all connectors which will be connected to @crtc
513 * according to @state. Useful to recompute the enable state for @crtc.
516 drm_atomic_connectors_for_crtc(struct drm_atomic_state
*state
,
517 struct drm_crtc
*crtc
)
519 int i
, num_connected_connectors
= 0;
521 for (i
= 0; i
< state
->num_connector
; i
++) {
522 struct drm_connector_state
*conn_state
;
524 conn_state
= state
->connector_states
[i
];
526 if (conn_state
&& conn_state
->crtc
== crtc
)
527 num_connected_connectors
++;
530 DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n",
531 state
, num_connected_connectors
, crtc
->base
.id
);
533 return num_connected_connectors
;
535 EXPORT_SYMBOL(drm_atomic_connectors_for_crtc
);
538 * drm_atomic_legacy_backoff - locking backoff for legacy ioctls
539 * @state: atomic state
541 * This function should be used by legacy entry points which don't understand
542 * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
543 * the slowpath completed.
545 void drm_atomic_legacy_backoff(struct drm_atomic_state
*state
)
550 drm_modeset_backoff(state
->acquire_ctx
);
552 ret
= drm_modeset_lock(&state
->dev
->mode_config
.connection_mutex
,
556 ret
= drm_modeset_lock_all_crtcs(state
->dev
,
561 EXPORT_SYMBOL(drm_atomic_legacy_backoff
);
564 * drm_atomic_check_only - check whether a given config would work
565 * @state: atomic configuration to check
567 * Note that this function can return -EDEADLK if the driver needed to acquire
568 * more locks but encountered a deadlock. The caller must then do the usual w/w
569 * backoff dance and restart. All other errors are fatal.
572 * 0 on success, negative error code on failure.
574 int drm_atomic_check_only(struct drm_atomic_state
*state
)
576 struct drm_mode_config
*config
= &state
->dev
->mode_config
;
578 DRM_DEBUG_KMS("checking %p\n", state
);
580 if (config
->funcs
->atomic_check
)
581 return config
->funcs
->atomic_check(state
->dev
, state
);
585 EXPORT_SYMBOL(drm_atomic_check_only
);
588 * drm_atomic_commit - commit configuration atomically
589 * @state: atomic configuration to check
591 * Note that this function can return -EDEADLK if the driver needed to acquire
592 * more locks but encountered a deadlock. The caller must then do the usual w/w
593 * backoff dance and restart. All other errors are fatal.
595 * Also note that on successful execution ownership of @state is transferred
596 * from the caller of this function to the function itself. The caller must not
597 * free or in any other way access @state. If the function fails then the caller
598 * must clean up @state itself.
601 * 0 on success, negative error code on failure.
603 int drm_atomic_commit(struct drm_atomic_state
*state
)
605 struct drm_mode_config
*config
= &state
->dev
->mode_config
;
608 ret
= drm_atomic_check_only(state
);
612 DRM_DEBUG_KMS("commiting %p\n", state
);
614 return config
->funcs
->atomic_commit(state
->dev
, state
, false);
616 EXPORT_SYMBOL(drm_atomic_commit
);
619 * drm_atomic_async_commit - atomic&async configuration commit
620 * @state: atomic configuration to check
622 * Note that this function can return -EDEADLK if the driver needed to acquire
623 * more locks but encountered a deadlock. The caller must then do the usual w/w
624 * backoff dance and restart. All other errors are fatal.
626 * Also note that on successful execution ownership of @state is transferred
627 * from the caller of this function to the function itself. The caller must not
628 * free or in any other way access @state. If the function fails then the caller
629 * must clean up @state itself.
632 * 0 on success, negative error code on failure.
634 int drm_atomic_async_commit(struct drm_atomic_state
*state
)
636 struct drm_mode_config
*config
= &state
->dev
->mode_config
;
639 ret
= drm_atomic_check_only(state
);
643 DRM_DEBUG_KMS("commiting %p asynchronously\n", state
);
645 return config
->funcs
->atomic_commit(state
->dev
, state
, true);
647 EXPORT_SYMBOL(drm_atomic_async_commit
);