Loading...
Note: File does not exist in v3.1.
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#ifndef DRM_ATOMIC_H_
29#define DRM_ATOMIC_H_
30
31#include <drm/drm_crtc.h>
32#include <drm/drm_util.h>
33
34/**
35 * struct drm_crtc_commit - track modeset commits on a CRTC
36 *
37 * This structure is used to track pending modeset changes and atomic commit on
38 * a per-CRTC basis. Since updating the list should never block, this structure
39 * is reference counted to allow waiters to safely wait on an event to complete,
40 * without holding any locks.
41 *
42 * It has 3 different events in total to allow a fine-grained synchronization
43 * between outstanding updates::
44 *
45 * atomic commit thread hardware
46 *
47 * write new state into hardware ----> ...
48 * signal hw_done
49 * switch to new state on next
50 * ... v/hblank
51 *
52 * wait for buffers to show up ...
53 *
54 * ... send completion irq
55 * irq handler signals flip_done
56 * cleanup old buffers
57 *
58 * signal cleanup_done
59 *
60 * wait for flip_done <----
61 * clean up atomic state
62 *
63 * The important bit to know is that &cleanup_done is the terminal event, but the
64 * ordering between &flip_done and &hw_done is entirely up to the specific driver
65 * and modeset state change.
66 *
67 * For an implementation of how to use this look at
68 * drm_atomic_helper_setup_commit() from the atomic helper library.
69 *
70 * See also drm_crtc_commit_wait().
71 */
72struct drm_crtc_commit {
73 /**
74 * @crtc:
75 *
76 * DRM CRTC for this commit.
77 */
78 struct drm_crtc *crtc;
79
80 /**
81 * @ref:
82 *
83 * Reference count for this structure. Needed to allow blocking on
84 * completions without the risk of the completion disappearing
85 * meanwhile.
86 */
87 struct kref ref;
88
89 /**
90 * @flip_done:
91 *
92 * Will be signaled when the hardware has flipped to the new set of
93 * buffers. Signals at the same time as when the drm event for this
94 * commit is sent to userspace, or when an out-fence is singalled. Note
95 * that for most hardware, in most cases this happens after @hw_done is
96 * signalled.
97 *
98 * Completion of this stage is signalled implicitly by calling
99 * drm_crtc_send_vblank_event() on &drm_crtc_state.event.
100 */
101 struct completion flip_done;
102
103 /**
104 * @hw_done:
105 *
106 * Will be signalled when all hw register changes for this commit have
107 * been written out. Especially when disabling a pipe this can be much
108 * later than @flip_done, since that can signal already when the
109 * screen goes black, whereas to fully shut down a pipe more register
110 * I/O is required.
111 *
112 * Note that this does not need to include separately reference-counted
113 * resources like backing storage buffer pinning, or runtime pm
114 * management.
115 *
116 * Drivers should call drm_atomic_helper_commit_hw_done() to signal
117 * completion of this stage.
118 */
119 struct completion hw_done;
120
121 /**
122 * @cleanup_done:
123 *
124 * Will be signalled after old buffers have been cleaned up by calling
125 * drm_atomic_helper_cleanup_planes(). Since this can only happen after
126 * a vblank wait completed it might be a bit later. This completion is
127 * useful to throttle updates and avoid hardware updates getting ahead
128 * of the buffer cleanup too much.
129 *
130 * Drivers should call drm_atomic_helper_commit_cleanup_done() to signal
131 * completion of this stage.
132 */
133 struct completion cleanup_done;
134
135 /**
136 * @commit_entry:
137 *
138 * Entry on the per-CRTC &drm_crtc.commit_list. Protected by
139 * $drm_crtc.commit_lock.
140 */
141 struct list_head commit_entry;
142
143 /**
144 * @event:
145 *
146 * &drm_pending_vblank_event pointer to clean up private events.
147 */
148 struct drm_pending_vblank_event *event;
149
150 /**
151 * @abort_completion:
152 *
153 * A flag that's set after drm_atomic_helper_setup_commit() takes a
154 * second reference for the completion of $drm_crtc_state.event. It's
155 * used by the free code to remove the second reference if commit fails.
156 */
157 bool abort_completion;
158};
159
160struct __drm_planes_state {
161 struct drm_plane *ptr;
162 struct drm_plane_state *state, *old_state, *new_state;
163};
164
165struct __drm_crtcs_state {
166 struct drm_crtc *ptr;
167 struct drm_crtc_state *state, *old_state, *new_state;
168
169 /**
170 * @commit:
171 *
172 * A reference to the CRTC commit object that is kept for use by
173 * drm_atomic_helper_wait_for_flip_done() after
174 * drm_atomic_helper_commit_hw_done() is called. This ensures that a
175 * concurrent commit won't free a commit object that is still in use.
176 */
177 struct drm_crtc_commit *commit;
178
179 s32 __user *out_fence_ptr;
180 u64 last_vblank_count;
181};
182
183struct __drm_connnectors_state {
184 struct drm_connector *ptr;
185 struct drm_connector_state *state, *old_state, *new_state;
186 /**
187 * @out_fence_ptr:
188 *
189 * User-provided pointer which the kernel uses to return a sync_file
190 * file descriptor. Used by writeback connectors to signal completion of
191 * the writeback.
192 */
193 s32 __user *out_fence_ptr;
194};
195
196struct drm_private_obj;
197struct drm_private_state;
198
199/**
200 * struct drm_private_state_funcs - atomic state functions for private objects
201 *
202 * These hooks are used by atomic helpers to create, swap and destroy states of
203 * private objects. The structure itself is used as a vtable to identify the
204 * associated private object type. Each private object type that needs to be
205 * added to the atomic states is expected to have an implementation of these
206 * hooks and pass a pointer to its drm_private_state_funcs struct to
207 * drm_atomic_get_private_obj_state().
208 */
209struct drm_private_state_funcs {
210 /**
211 * @atomic_duplicate_state:
212 *
213 * Duplicate the current state of the private object and return it. It
214 * is an error to call this before obj->state has been initialized.
215 *
216 * RETURNS:
217 *
218 * Duplicated atomic state or NULL when obj->state is not
219 * initialized or allocation failed.
220 */
221 struct drm_private_state *(*atomic_duplicate_state)(struct drm_private_obj *obj);
222
223 /**
224 * @atomic_destroy_state:
225 *
226 * Frees the private object state created with @atomic_duplicate_state.
227 */
228 void (*atomic_destroy_state)(struct drm_private_obj *obj,
229 struct drm_private_state *state);
230
231 /**
232 * @atomic_print_state:
233 *
234 * If driver subclasses &struct drm_private_state, it should implement
235 * this optional hook for printing additional driver specific state.
236 *
237 * Do not call this directly, use drm_atomic_private_obj_print_state()
238 * instead.
239 */
240 void (*atomic_print_state)(struct drm_printer *p,
241 const struct drm_private_state *state);
242};
243
244/**
245 * struct drm_private_obj - base struct for driver private atomic object
246 *
247 * A driver private object is initialized by calling
248 * drm_atomic_private_obj_init() and cleaned up by calling
249 * drm_atomic_private_obj_fini().
250 *
251 * Currently only tracks the state update functions and the opaque driver
252 * private state itself, but in the future might also track which
253 * &drm_modeset_lock is required to duplicate and update this object's state.
254 *
255 * All private objects must be initialized before the DRM device they are
256 * attached to is registered to the DRM subsystem (call to drm_dev_register())
257 * and should stay around until this DRM device is unregistered (call to
258 * drm_dev_unregister()). In other words, private objects lifetime is tied
259 * to the DRM device lifetime. This implies that:
260 *
261 * 1/ all calls to drm_atomic_private_obj_init() must be done before calling
262 * drm_dev_register()
263 * 2/ all calls to drm_atomic_private_obj_fini() must be done after calling
264 * drm_dev_unregister()
265 *
266 * If that private object is used to store a state shared by multiple
267 * CRTCs, proper care must be taken to ensure that non-blocking commits are
268 * properly ordered to avoid a use-after-free issue.
269 *
270 * Indeed, assuming a sequence of two non-blocking &drm_atomic_commit on two
271 * different &drm_crtc using different &drm_plane and &drm_connector, so with no
272 * resources shared, there's no guarantee on which commit is going to happen
273 * first. However, the second &drm_atomic_commit will consider the first
274 * &drm_private_obj its old state, and will be in charge of freeing it whenever
275 * the second &drm_atomic_commit is done.
276 *
277 * If the first &drm_atomic_commit happens after it, it will consider its
278 * &drm_private_obj the new state and will be likely to access it, resulting in
279 * an access to a freed memory region. Drivers should store (and get a reference
280 * to) the &drm_crtc_commit structure in our private state in
281 * &drm_mode_config_helper_funcs.atomic_commit_setup, and then wait for that
282 * commit to complete as the first step of
283 * &drm_mode_config_helper_funcs.atomic_commit_tail, similar to
284 * drm_atomic_helper_wait_for_dependencies().
285 */
286struct drm_private_obj {
287 /**
288 * @head: List entry used to attach a private object to a &drm_device
289 * (queued to &drm_mode_config.privobj_list).
290 */
291 struct list_head head;
292
293 /**
294 * @lock: Modeset lock to protect the state object.
295 */
296 struct drm_modeset_lock lock;
297
298 /**
299 * @state: Current atomic state for this driver private object.
300 */
301 struct drm_private_state *state;
302
303 /**
304 * @funcs:
305 *
306 * Functions to manipulate the state of this driver private object, see
307 * &drm_private_state_funcs.
308 */
309 const struct drm_private_state_funcs *funcs;
310};
311
312/**
313 * drm_for_each_privobj() - private object iterator
314 *
315 * @privobj: pointer to the current private object. Updated after each
316 * iteration
317 * @dev: the DRM device we want get private objects from
318 *
319 * Allows one to iterate over all private objects attached to @dev
320 */
321#define drm_for_each_privobj(privobj, dev) \
322 list_for_each_entry(privobj, &(dev)->mode_config.privobj_list, head)
323
324/**
325 * struct drm_private_state - base struct for driver private object state
326 *
327 * Currently only contains a backpointer to the overall atomic update,
328 * and the relevant private object but in the future also might hold
329 * synchronization information similar to e.g. &drm_crtc.commit.
330 */
331struct drm_private_state {
332 /**
333 * @state: backpointer to global drm_atomic_state
334 */
335 struct drm_atomic_state *state;
336
337 /**
338 * @obj: backpointer to the private object
339 */
340 struct drm_private_obj *obj;
341};
342
343struct __drm_private_objs_state {
344 struct drm_private_obj *ptr;
345 struct drm_private_state *state, *old_state, *new_state;
346};
347
348/**
349 * struct drm_atomic_state - Atomic commit structure
350 *
351 * This structure is the kernel counterpart of @drm_mode_atomic and represents
352 * an atomic commit that transitions from an old to a new display state. It
353 * contains all the objects affected by the atomic commit and both the new
354 * state structures and pointers to the old state structures for
355 * these.
356 *
357 * States are added to an atomic update by calling drm_atomic_get_crtc_state(),
358 * drm_atomic_get_plane_state(), drm_atomic_get_connector_state(), or for
359 * private state structures, drm_atomic_get_private_obj_state().
360 */
361struct drm_atomic_state {
362 /**
363 * @ref:
364 *
365 * Count of all references to this update (will not be freed until zero).
366 */
367 struct kref ref;
368
369 /**
370 * @dev: Parent DRM Device.
371 */
372 struct drm_device *dev;
373
374 /**
375 * @allow_modeset:
376 *
377 * Allow full modeset. This is used by the ATOMIC IOCTL handler to
378 * implement the DRM_MODE_ATOMIC_ALLOW_MODESET flag. Drivers should
379 * never consult this flag, instead looking at the output of
380 * drm_atomic_crtc_needs_modeset().
381 */
382 bool allow_modeset : 1;
383 /**
384 * @legacy_cursor_update:
385 *
386 * Hint to enforce legacy cursor IOCTL semantics.
387 *
388 * WARNING: This is thoroughly broken and pretty much impossible to
389 * implement correctly. Drivers must ignore this and should instead
390 * implement &drm_plane_helper_funcs.atomic_async_check and
391 * &drm_plane_helper_funcs.atomic_async_commit hooks. New users of this
392 * flag are not allowed.
393 */
394 bool legacy_cursor_update : 1;
395
396 /**
397 * @async_update: hint for asynchronous plane update
398 */
399 bool async_update : 1;
400
401 /**
402 * @duplicated:
403 *
404 * Indicates whether or not this atomic state was duplicated using
405 * drm_atomic_helper_duplicate_state(). Drivers and atomic helpers
406 * should use this to fixup normal inconsistencies in duplicated
407 * states.
408 */
409 bool duplicated : 1;
410
411 /**
412 * @planes:
413 *
414 * Pointer to array of @drm_plane and @drm_plane_state part of this
415 * update.
416 */
417 struct __drm_planes_state *planes;
418
419 /**
420 * @crtcs:
421 *
422 * Pointer to array of @drm_crtc and @drm_crtc_state part of this
423 * update.
424 */
425 struct __drm_crtcs_state *crtcs;
426
427 /**
428 * @num_connector: size of the @connectors array
429 */
430 int num_connector;
431
432 /**
433 * @connectors:
434 *
435 * Pointer to array of @drm_connector and @drm_connector_state part of
436 * this update.
437 */
438 struct __drm_connnectors_state *connectors;
439
440 /**
441 * @num_private_objs: size of the @private_objs array
442 */
443 int num_private_objs;
444
445 /**
446 * @private_objs:
447 *
448 * Pointer to array of @drm_private_obj and @drm_private_obj_state part
449 * of this update.
450 */
451 struct __drm_private_objs_state *private_objs;
452
453 /**
454 * @acquire_ctx: acquire context for this atomic modeset state update
455 */
456 struct drm_modeset_acquire_ctx *acquire_ctx;
457
458 /**
459 * @fake_commit:
460 *
461 * Used for signaling unbound planes/connectors.
462 * When a connector or plane is not bound to any CRTC, it's still important
463 * to preserve linearity to prevent the atomic states from being freed too early.
464 *
465 * This commit (if set) is not bound to any CRTC, but will be completed when
466 * drm_atomic_helper_commit_hw_done() is called.
467 */
468 struct drm_crtc_commit *fake_commit;
469
470 /**
471 * @commit_work:
472 *
473 * Work item which can be used by the driver or helpers to execute the
474 * commit without blocking.
475 */
476 struct work_struct commit_work;
477};
478
479void __drm_crtc_commit_free(struct kref *kref);
480
481/**
482 * drm_crtc_commit_get - acquire a reference to the CRTC commit
483 * @commit: CRTC commit
484 *
485 * Increases the reference of @commit.
486 *
487 * Returns:
488 * The pointer to @commit, with reference increased.
489 */
490static inline struct drm_crtc_commit *drm_crtc_commit_get(struct drm_crtc_commit *commit)
491{
492 kref_get(&commit->ref);
493 return commit;
494}
495
496/**
497 * drm_crtc_commit_put - release a reference to the CRTC commmit
498 * @commit: CRTC commit
499 *
500 * This releases a reference to @commit which is freed after removing the
501 * final reference. No locking required and callable from any context.
502 */
503static inline void drm_crtc_commit_put(struct drm_crtc_commit *commit)
504{
505 kref_put(&commit->ref, __drm_crtc_commit_free);
506}
507
508int drm_crtc_commit_wait(struct drm_crtc_commit *commit);
509
510struct drm_atomic_state * __must_check
511drm_atomic_state_alloc(struct drm_device *dev);
512void drm_atomic_state_clear(struct drm_atomic_state *state);
513
514/**
515 * drm_atomic_state_get - acquire a reference to the atomic state
516 * @state: The atomic state
517 *
518 * Returns a new reference to the @state
519 */
520static inline struct drm_atomic_state *
521drm_atomic_state_get(struct drm_atomic_state *state)
522{
523 kref_get(&state->ref);
524 return state;
525}
526
527void __drm_atomic_state_free(struct kref *ref);
528
529/**
530 * drm_atomic_state_put - release a reference to the atomic state
531 * @state: The atomic state
532 *
533 * This releases a reference to @state which is freed after removing the
534 * final reference. No locking required and callable from any context.
535 */
536static inline void drm_atomic_state_put(struct drm_atomic_state *state)
537{
538 kref_put(&state->ref, __drm_atomic_state_free);
539}
540
541int __must_check
542drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
543void drm_atomic_state_default_clear(struct drm_atomic_state *state);
544void drm_atomic_state_default_release(struct drm_atomic_state *state);
545
546struct drm_crtc_state * __must_check
547drm_atomic_get_crtc_state(struct drm_atomic_state *state,
548 struct drm_crtc *crtc);
549struct drm_plane_state * __must_check
550drm_atomic_get_plane_state(struct drm_atomic_state *state,
551 struct drm_plane *plane);
552struct drm_connector_state * __must_check
553drm_atomic_get_connector_state(struct drm_atomic_state *state,
554 struct drm_connector *connector);
555
556void drm_atomic_private_obj_init(struct drm_device *dev,
557 struct drm_private_obj *obj,
558 struct drm_private_state *state,
559 const struct drm_private_state_funcs *funcs);
560void drm_atomic_private_obj_fini(struct drm_private_obj *obj);
561
562struct drm_private_state * __must_check
563drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
564 struct drm_private_obj *obj);
565struct drm_private_state *
566drm_atomic_get_old_private_obj_state(const struct drm_atomic_state *state,
567 struct drm_private_obj *obj);
568struct drm_private_state *
569drm_atomic_get_new_private_obj_state(const struct drm_atomic_state *state,
570 struct drm_private_obj *obj);
571
572struct drm_connector *
573drm_atomic_get_old_connector_for_encoder(const struct drm_atomic_state *state,
574 struct drm_encoder *encoder);
575struct drm_connector *
576drm_atomic_get_new_connector_for_encoder(const struct drm_atomic_state *state,
577 struct drm_encoder *encoder);
578
579struct drm_crtc *
580drm_atomic_get_old_crtc_for_encoder(struct drm_atomic_state *state,
581 struct drm_encoder *encoder);
582struct drm_crtc *
583drm_atomic_get_new_crtc_for_encoder(struct drm_atomic_state *state,
584 struct drm_encoder *encoder);
585
586/**
587 * drm_atomic_get_existing_crtc_state - get CRTC state, if it exists
588 * @state: global atomic state object
589 * @crtc: CRTC to grab
590 *
591 * This function returns the CRTC state for the given CRTC, or NULL
592 * if the CRTC is not part of the global atomic state.
593 *
594 * This function is deprecated, @drm_atomic_get_old_crtc_state or
595 * @drm_atomic_get_new_crtc_state should be used instead.
596 */
597static inline struct drm_crtc_state *
598drm_atomic_get_existing_crtc_state(const struct drm_atomic_state *state,
599 struct drm_crtc *crtc)
600{
601 return state->crtcs[drm_crtc_index(crtc)].state;
602}
603
604/**
605 * drm_atomic_get_old_crtc_state - get old CRTC state, if it exists
606 * @state: global atomic state object
607 * @crtc: CRTC to grab
608 *
609 * This function returns the old CRTC state for the given CRTC, or
610 * NULL if the CRTC is not part of the global atomic state.
611 */
612static inline struct drm_crtc_state *
613drm_atomic_get_old_crtc_state(const struct drm_atomic_state *state,
614 struct drm_crtc *crtc)
615{
616 return state->crtcs[drm_crtc_index(crtc)].old_state;
617}
618/**
619 * drm_atomic_get_new_crtc_state - get new CRTC state, if it exists
620 * @state: global atomic state object
621 * @crtc: CRTC to grab
622 *
623 * This function returns the new CRTC state for the given CRTC, or
624 * NULL if the CRTC is not part of the global atomic state.
625 */
626static inline struct drm_crtc_state *
627drm_atomic_get_new_crtc_state(const struct drm_atomic_state *state,
628 struct drm_crtc *crtc)
629{
630 return state->crtcs[drm_crtc_index(crtc)].new_state;
631}
632
633/**
634 * drm_atomic_get_existing_plane_state - get plane state, if it exists
635 * @state: global atomic state object
636 * @plane: plane to grab
637 *
638 * This function returns the plane state for the given plane, or NULL
639 * if the plane is not part of the global atomic state.
640 *
641 * This function is deprecated, @drm_atomic_get_old_plane_state or
642 * @drm_atomic_get_new_plane_state should be used instead.
643 */
644static inline struct drm_plane_state *
645drm_atomic_get_existing_plane_state(const struct drm_atomic_state *state,
646 struct drm_plane *plane)
647{
648 return state->planes[drm_plane_index(plane)].state;
649}
650
651/**
652 * drm_atomic_get_old_plane_state - get plane state, if it exists
653 * @state: global atomic state object
654 * @plane: plane to grab
655 *
656 * This function returns the old plane state for the given plane, or
657 * NULL if the plane is not part of the global atomic state.
658 */
659static inline struct drm_plane_state *
660drm_atomic_get_old_plane_state(const struct drm_atomic_state *state,
661 struct drm_plane *plane)
662{
663 return state->planes[drm_plane_index(plane)].old_state;
664}
665
666/**
667 * drm_atomic_get_new_plane_state - get plane state, if it exists
668 * @state: global atomic state object
669 * @plane: plane to grab
670 *
671 * This function returns the new plane state for the given plane, or
672 * NULL if the plane is not part of the global atomic state.
673 */
674static inline struct drm_plane_state *
675drm_atomic_get_new_plane_state(const struct drm_atomic_state *state,
676 struct drm_plane *plane)
677{
678 return state->planes[drm_plane_index(plane)].new_state;
679}
680
681/**
682 * drm_atomic_get_existing_connector_state - get connector state, if it exists
683 * @state: global atomic state object
684 * @connector: connector to grab
685 *
686 * This function returns the connector state for the given connector,
687 * or NULL if the connector is not part of the global atomic state.
688 *
689 * This function is deprecated, @drm_atomic_get_old_connector_state or
690 * @drm_atomic_get_new_connector_state should be used instead.
691 */
692static inline struct drm_connector_state *
693drm_atomic_get_existing_connector_state(const struct drm_atomic_state *state,
694 struct drm_connector *connector)
695{
696 int index = drm_connector_index(connector);
697
698 if (index >= state->num_connector)
699 return NULL;
700
701 return state->connectors[index].state;
702}
703
704/**
705 * drm_atomic_get_old_connector_state - get connector state, if it exists
706 * @state: global atomic state object
707 * @connector: connector to grab
708 *
709 * This function returns the old connector state for the given connector,
710 * or NULL if the connector is not part of the global atomic state.
711 */
712static inline struct drm_connector_state *
713drm_atomic_get_old_connector_state(const struct drm_atomic_state *state,
714 struct drm_connector *connector)
715{
716 int index = drm_connector_index(connector);
717
718 if (index >= state->num_connector)
719 return NULL;
720
721 return state->connectors[index].old_state;
722}
723
724/**
725 * drm_atomic_get_new_connector_state - get connector state, if it exists
726 * @state: global atomic state object
727 * @connector: connector to grab
728 *
729 * This function returns the new connector state for the given connector,
730 * or NULL if the connector is not part of the global atomic state.
731 */
732static inline struct drm_connector_state *
733drm_atomic_get_new_connector_state(const struct drm_atomic_state *state,
734 struct drm_connector *connector)
735{
736 int index = drm_connector_index(connector);
737
738 if (index >= state->num_connector)
739 return NULL;
740
741 return state->connectors[index].new_state;
742}
743
744/**
745 * __drm_atomic_get_current_plane_state - get current plane state
746 * @state: global atomic state object
747 * @plane: plane to grab
748 *
749 * This function returns the plane state for the given plane, either from
750 * @state, or if the plane isn't part of the atomic state update, from @plane.
751 * This is useful in atomic check callbacks, when drivers need to peek at, but
752 * not change, state of other planes, since it avoids threading an error code
753 * back up the call chain.
754 *
755 * WARNING:
756 *
757 * Note that this function is in general unsafe since it doesn't check for the
758 * required locking for access state structures. Drivers must ensure that it is
759 * safe to access the returned state structure through other means. One common
760 * example is when planes are fixed to a single CRTC, and the driver knows that
761 * the CRTC lock is held already. In that case holding the CRTC lock gives a
762 * read-lock on all planes connected to that CRTC. But if planes can be
763 * reassigned things get more tricky. In that case it's better to use
764 * drm_atomic_get_plane_state and wire up full error handling.
765 *
766 * Returns:
767 *
768 * Read-only pointer to the current plane state.
769 */
770static inline const struct drm_plane_state *
771__drm_atomic_get_current_plane_state(const struct drm_atomic_state *state,
772 struct drm_plane *plane)
773{
774 if (state->planes[drm_plane_index(plane)].state)
775 return state->planes[drm_plane_index(plane)].state;
776
777 return plane->state;
778}
779
780int __must_check
781drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
782 struct drm_encoder *encoder);
783int __must_check
784drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
785 struct drm_crtc *crtc);
786int __must_check
787drm_atomic_add_affected_planes(struct drm_atomic_state *state,
788 struct drm_crtc *crtc);
789
790int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
791int __must_check drm_atomic_commit(struct drm_atomic_state *state);
792int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
793
794void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
795
796/**
797 * for_each_oldnew_connector_in_state - iterate over all connectors in an atomic update
798 * @__state: &struct drm_atomic_state pointer
799 * @connector: &struct drm_connector iteration cursor
800 * @old_connector_state: &struct drm_connector_state iteration cursor for the
801 * old state
802 * @new_connector_state: &struct drm_connector_state iteration cursor for the
803 * new state
804 * @__i: int iteration cursor, for macro-internal use
805 *
806 * This iterates over all connectors in an atomic update, tracking both old and
807 * new state. This is useful in places where the state delta needs to be
808 * considered, for example in atomic check functions.
809 */
810#define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
811 for ((__i) = 0; \
812 (__i) < (__state)->num_connector; \
813 (__i)++) \
814 for_each_if ((__state)->connectors[__i].ptr && \
815 ((connector) = (__state)->connectors[__i].ptr, \
816 (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
817 (old_connector_state) = (__state)->connectors[__i].old_state, \
818 (new_connector_state) = (__state)->connectors[__i].new_state, 1))
819
820/**
821 * for_each_old_connector_in_state - iterate over all connectors in an atomic update
822 * @__state: &struct drm_atomic_state pointer
823 * @connector: &struct drm_connector iteration cursor
824 * @old_connector_state: &struct drm_connector_state iteration cursor for the
825 * old state
826 * @__i: int iteration cursor, for macro-internal use
827 *
828 * This iterates over all connectors in an atomic update, tracking only the old
829 * state. This is useful in disable functions, where we need the old state the
830 * hardware is still in.
831 */
832#define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
833 for ((__i) = 0; \
834 (__i) < (__state)->num_connector; \
835 (__i)++) \
836 for_each_if ((__state)->connectors[__i].ptr && \
837 ((connector) = (__state)->connectors[__i].ptr, \
838 (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
839 (old_connector_state) = (__state)->connectors[__i].old_state, 1))
840
841/**
842 * for_each_new_connector_in_state - iterate over all connectors in an atomic update
843 * @__state: &struct drm_atomic_state pointer
844 * @connector: &struct drm_connector iteration cursor
845 * @new_connector_state: &struct drm_connector_state iteration cursor for the
846 * new state
847 * @__i: int iteration cursor, for macro-internal use
848 *
849 * This iterates over all connectors in an atomic update, tracking only the new
850 * state. This is useful in enable functions, where we need the new state the
851 * hardware should be in when the atomic commit operation has completed.
852 */
853#define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
854 for ((__i) = 0; \
855 (__i) < (__state)->num_connector; \
856 (__i)++) \
857 for_each_if ((__state)->connectors[__i].ptr && \
858 ((connector) = (__state)->connectors[__i].ptr, \
859 (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
860 (new_connector_state) = (__state)->connectors[__i].new_state, \
861 (void)(new_connector_state) /* Only to avoid unused-but-set-variable warning */, 1))
862
863/**
864 * for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
865 * @__state: &struct drm_atomic_state pointer
866 * @crtc: &struct drm_crtc iteration cursor
867 * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
868 * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
869 * @__i: int iteration cursor, for macro-internal use
870 *
871 * This iterates over all CRTCs in an atomic update, tracking both old and
872 * new state. This is useful in places where the state delta needs to be
873 * considered, for example in atomic check functions.
874 */
875#define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
876 for ((__i) = 0; \
877 (__i) < (__state)->dev->mode_config.num_crtc; \
878 (__i)++) \
879 for_each_if ((__state)->crtcs[__i].ptr && \
880 ((crtc) = (__state)->crtcs[__i].ptr, \
881 (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
882 (old_crtc_state) = (__state)->crtcs[__i].old_state, \
883 (void)(old_crtc_state) /* Only to avoid unused-but-set-variable warning */, \
884 (new_crtc_state) = (__state)->crtcs[__i].new_state, \
885 (void)(new_crtc_state) /* Only to avoid unused-but-set-variable warning */, 1))
886
887/**
888 * for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
889 * @__state: &struct drm_atomic_state pointer
890 * @crtc: &struct drm_crtc iteration cursor
891 * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
892 * @__i: int iteration cursor, for macro-internal use
893 *
894 * This iterates over all CRTCs in an atomic update, tracking only the old
895 * state. This is useful in disable functions, where we need the old state the
896 * hardware is still in.
897 */
898#define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i) \
899 for ((__i) = 0; \
900 (__i) < (__state)->dev->mode_config.num_crtc; \
901 (__i)++) \
902 for_each_if ((__state)->crtcs[__i].ptr && \
903 ((crtc) = (__state)->crtcs[__i].ptr, \
904 (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
905 (old_crtc_state) = (__state)->crtcs[__i].old_state, 1))
906
907/**
908 * for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
909 * @__state: &struct drm_atomic_state pointer
910 * @crtc: &struct drm_crtc iteration cursor
911 * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
912 * @__i: int iteration cursor, for macro-internal use
913 *
914 * This iterates over all CRTCs in an atomic update, tracking only the new
915 * state. This is useful in enable functions, where we need the new state the
916 * hardware should be in when the atomic commit operation has completed.
917 */
918#define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i) \
919 for ((__i) = 0; \
920 (__i) < (__state)->dev->mode_config.num_crtc; \
921 (__i)++) \
922 for_each_if ((__state)->crtcs[__i].ptr && \
923 ((crtc) = (__state)->crtcs[__i].ptr, \
924 (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
925 (new_crtc_state) = (__state)->crtcs[__i].new_state, \
926 (void)(new_crtc_state) /* Only to avoid unused-but-set-variable warning */, 1))
927
928/**
929 * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
930 * @__state: &struct drm_atomic_state pointer
931 * @plane: &struct drm_plane iteration cursor
932 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
933 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
934 * @__i: int iteration cursor, for macro-internal use
935 *
936 * This iterates over all planes in an atomic update, tracking both old and
937 * new state. This is useful in places where the state delta needs to be
938 * considered, for example in atomic check functions.
939 */
940#define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
941 for ((__i) = 0; \
942 (__i) < (__state)->dev->mode_config.num_total_plane; \
943 (__i)++) \
944 for_each_if ((__state)->planes[__i].ptr && \
945 ((plane) = (__state)->planes[__i].ptr, \
946 (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
947 (old_plane_state) = (__state)->planes[__i].old_state,\
948 (new_plane_state) = (__state)->planes[__i].new_state, 1))
949
950/**
951 * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic
952 * update in reverse order
953 * @__state: &struct drm_atomic_state pointer
954 * @plane: &struct drm_plane iteration cursor
955 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
956 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
957 * @__i: int iteration cursor, for macro-internal use
958 *
959 * This iterates over all planes in an atomic update in reverse order,
960 * tracking both old and new state. This is useful in places where the
961 * state delta needs to be considered, for example in atomic check functions.
962 */
963#define for_each_oldnew_plane_in_state_reverse(__state, plane, old_plane_state, new_plane_state, __i) \
964 for ((__i) = ((__state)->dev->mode_config.num_total_plane - 1); \
965 (__i) >= 0; \
966 (__i)--) \
967 for_each_if ((__state)->planes[__i].ptr && \
968 ((plane) = (__state)->planes[__i].ptr, \
969 (old_plane_state) = (__state)->planes[__i].old_state,\
970 (new_plane_state) = (__state)->planes[__i].new_state, 1))
971
972/**
973 * for_each_new_plane_in_state_reverse - other than only tracking new state,
974 * it's the same as for_each_oldnew_plane_in_state_reverse
975 * @__state: &struct drm_atomic_state pointer
976 * @plane: &struct drm_plane iteration cursor
977 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
978 * @__i: int iteration cursor, for macro-internal use
979 */
980#define for_each_new_plane_in_state_reverse(__state, plane, new_plane_state, __i) \
981 for ((__i) = ((__state)->dev->mode_config.num_total_plane - 1); \
982 (__i) >= 0; \
983 (__i)--) \
984 for_each_if ((__state)->planes[__i].ptr && \
985 ((plane) = (__state)->planes[__i].ptr, \
986 (new_plane_state) = (__state)->planes[__i].new_state, 1))
987
988/**
989 * for_each_old_plane_in_state - iterate over all planes in an atomic update
990 * @__state: &struct drm_atomic_state pointer
991 * @plane: &struct drm_plane iteration cursor
992 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
993 * @__i: int iteration cursor, for macro-internal use
994 *
995 * This iterates over all planes in an atomic update, tracking only the old
996 * state. This is useful in disable functions, where we need the old state the
997 * hardware is still in.
998 */
999#define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
1000 for ((__i) = 0; \
1001 (__i) < (__state)->dev->mode_config.num_total_plane; \
1002 (__i)++) \
1003 for_each_if ((__state)->planes[__i].ptr && \
1004 ((plane) = (__state)->planes[__i].ptr, \
1005 (old_plane_state) = (__state)->planes[__i].old_state, 1))
1006/**
1007 * for_each_new_plane_in_state - iterate over all planes in an atomic update
1008 * @__state: &struct drm_atomic_state pointer
1009 * @plane: &struct drm_plane iteration cursor
1010 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
1011 * @__i: int iteration cursor, for macro-internal use
1012 *
1013 * This iterates over all planes in an atomic update, tracking only the new
1014 * state. This is useful in enable functions, where we need the new state the
1015 * hardware should be in when the atomic commit operation has completed.
1016 */
1017#define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
1018 for ((__i) = 0; \
1019 (__i) < (__state)->dev->mode_config.num_total_plane; \
1020 (__i)++) \
1021 for_each_if ((__state)->planes[__i].ptr && \
1022 ((plane) = (__state)->planes[__i].ptr, \
1023 (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
1024 (new_plane_state) = (__state)->planes[__i].new_state, \
1025 (void)(new_plane_state) /* Only to avoid unused-but-set-variable warning */, 1))
1026
1027/**
1028 * for_each_oldnew_private_obj_in_state - iterate over all private objects in an atomic update
1029 * @__state: &struct drm_atomic_state pointer
1030 * @obj: &struct drm_private_obj iteration cursor
1031 * @old_obj_state: &struct drm_private_state iteration cursor for the old state
1032 * @new_obj_state: &struct drm_private_state iteration cursor for the new state
1033 * @__i: int iteration cursor, for macro-internal use
1034 *
1035 * This iterates over all private objects in an atomic update, tracking both
1036 * old and new state. This is useful in places where the state delta needs
1037 * to be considered, for example in atomic check functions.
1038 */
1039#define for_each_oldnew_private_obj_in_state(__state, obj, old_obj_state, new_obj_state, __i) \
1040 for ((__i) = 0; \
1041 (__i) < (__state)->num_private_objs && \
1042 ((obj) = (__state)->private_objs[__i].ptr, \
1043 (old_obj_state) = (__state)->private_objs[__i].old_state, \
1044 (new_obj_state) = (__state)->private_objs[__i].new_state, 1); \
1045 (__i)++)
1046
1047/**
1048 * for_each_old_private_obj_in_state - iterate over all private objects in an atomic update
1049 * @__state: &struct drm_atomic_state pointer
1050 * @obj: &struct drm_private_obj iteration cursor
1051 * @old_obj_state: &struct drm_private_state iteration cursor for the old state
1052 * @__i: int iteration cursor, for macro-internal use
1053 *
1054 * This iterates over all private objects in an atomic update, tracking only
1055 * the old state. This is useful in disable functions, where we need the old
1056 * state the hardware is still in.
1057 */
1058#define for_each_old_private_obj_in_state(__state, obj, old_obj_state, __i) \
1059 for ((__i) = 0; \
1060 (__i) < (__state)->num_private_objs && \
1061 ((obj) = (__state)->private_objs[__i].ptr, \
1062 (old_obj_state) = (__state)->private_objs[__i].old_state, 1); \
1063 (__i)++)
1064
1065/**
1066 * for_each_new_private_obj_in_state - iterate over all private objects in an atomic update
1067 * @__state: &struct drm_atomic_state pointer
1068 * @obj: &struct drm_private_obj iteration cursor
1069 * @new_obj_state: &struct drm_private_state iteration cursor for the new state
1070 * @__i: int iteration cursor, for macro-internal use
1071 *
1072 * This iterates over all private objects in an atomic update, tracking only
1073 * the new state. This is useful in enable functions, where we need the new state the
1074 * hardware should be in when the atomic commit operation has completed.
1075 */
1076#define for_each_new_private_obj_in_state(__state, obj, new_obj_state, __i) \
1077 for ((__i) = 0; \
1078 (__i) < (__state)->num_private_objs && \
1079 ((obj) = (__state)->private_objs[__i].ptr, \
1080 (void)(obj) /* Only to avoid unused-but-set-variable warning */, \
1081 (new_obj_state) = (__state)->private_objs[__i].new_state, 1); \
1082 (__i)++)
1083
1084/**
1085 * drm_atomic_crtc_needs_modeset - compute combined modeset need
1086 * @state: &drm_crtc_state for the CRTC
1087 *
1088 * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
1089 * whether the state CRTC changed enough to need a full modeset cycle:
1090 * mode_changed, active_changed and connectors_changed. This helper simply
1091 * combines these three to compute the overall need for a modeset for @state.
1092 *
1093 * The atomic helper code sets these booleans, but drivers can and should
1094 * change them appropriately to accurately represent whether a modeset is
1095 * really needed. In general, drivers should avoid full modesets whenever
1096 * possible.
1097 *
1098 * For example if the CRTC mode has changed, and the hardware is able to enact
1099 * the requested mode change without going through a full modeset, the driver
1100 * should clear mode_changed in its &drm_mode_config_funcs.atomic_check
1101 * implementation.
1102 */
1103static inline bool
1104drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
1105{
1106 return state->mode_changed || state->active_changed ||
1107 state->connectors_changed;
1108}
1109
1110/**
1111 * drm_atomic_crtc_effectively_active - compute whether CRTC is actually active
1112 * @state: &drm_crtc_state for the CRTC
1113 *
1114 * When in self refresh mode, the crtc_state->active value will be false, since
1115 * the CRTC is off. However in some cases we're interested in whether the CRTC
1116 * is active, or effectively active (ie: it's connected to an active display).
1117 * In these cases, use this function instead of just checking active.
1118 */
1119static inline bool
1120drm_atomic_crtc_effectively_active(const struct drm_crtc_state *state)
1121{
1122 return state->active || state->self_refresh_active;
1123}
1124
1125/**
1126 * struct drm_bus_cfg - bus configuration
1127 *
1128 * This structure stores the configuration of a physical bus between two
1129 * components in an output pipeline, usually between two bridges, an encoder
1130 * and a bridge, or a bridge and a connector.
1131 *
1132 * The bus configuration is stored in &drm_bridge_state separately for the
1133 * input and output buses, as seen from the point of view of each bridge. The
1134 * bus configuration of a bridge output is usually identical to the
1135 * configuration of the next bridge's input, but may differ if the signals are
1136 * modified between the two bridges, for instance by an inverter on the board.
1137 * The input and output configurations of a bridge may differ if the bridge
1138 * modifies the signals internally, for instance by performing format
1139 * conversion, or modifying signals polarities.
1140 */
1141struct drm_bus_cfg {
1142 /**
1143 * @format: format used on this bus (one of the MEDIA_BUS_FMT_* format)
1144 *
1145 * This field should not be directly modified by drivers
1146 * (drm_atomic_bridge_chain_select_bus_fmts() takes care of the bus
1147 * format negotiation).
1148 */
1149 u32 format;
1150
1151 /**
1152 * @flags: DRM_BUS_* flags used on this bus
1153 */
1154 u32 flags;
1155};
1156
1157/**
1158 * struct drm_bridge_state - Atomic bridge state object
1159 */
1160struct drm_bridge_state {
1161 /**
1162 * @base: inherit from &drm_private_state
1163 */
1164 struct drm_private_state base;
1165
1166 /**
1167 * @bridge: the bridge this state refers to
1168 */
1169 struct drm_bridge *bridge;
1170
1171 /**
1172 * @input_bus_cfg: input bus configuration
1173 */
1174 struct drm_bus_cfg input_bus_cfg;
1175
1176 /**
1177 * @output_bus_cfg: output bus configuration
1178 */
1179 struct drm_bus_cfg output_bus_cfg;
1180};
1181
1182static inline struct drm_bridge_state *
1183drm_priv_to_bridge_state(struct drm_private_state *priv)
1184{
1185 return container_of(priv, struct drm_bridge_state, base);
1186}
1187
1188struct drm_bridge_state *
1189drm_atomic_get_bridge_state(struct drm_atomic_state *state,
1190 struct drm_bridge *bridge);
1191struct drm_bridge_state *
1192drm_atomic_get_old_bridge_state(const struct drm_atomic_state *state,
1193 struct drm_bridge *bridge);
1194struct drm_bridge_state *
1195drm_atomic_get_new_bridge_state(const struct drm_atomic_state *state,
1196 struct drm_bridge *bridge);
1197
1198#endif /* DRM_ATOMIC_H_ */