aboutsummaryrefslogtreecommitdiff
path: root/include/drm/drm_atomic.h
blob: 951dfb15c27b0acbffe34d20fed699a48fdd7b62 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
/*
 * Copyright (C) 2014 Red Hat
 * Copyright (C) 2014 Intel Corp.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 * Rob Clark <robdclark@gmail.com>
 * Daniel Vetter <daniel.vetter@ffwll.ch>
 */

#ifndef DRM_ATOMIC_H_
#define DRM_ATOMIC_H_

#include <drm/drm_crtc.h>
#include <drm/drm_util.h>

/**
 * struct drm_crtc_commit - track modeset commits on a CRTC
 *
 * This structure is used to track pending modeset changes and atomic commit on
 * a per-CRTC basis. Since updating the list should never block, this structure
 * is reference counted to allow waiters to safely wait on an event to complete,
 * without holding any locks.
 *
 * It has 3 different events in total to allow a fine-grained synchronization
 * between outstanding updates::
 *
 *	atomic commit thread			hardware
 *
 * 	write new state into hardware	---->	...
 * 	signal hw_done
 * 						switch to new state on next
 * 	...					v/hblank
 *
 *	wait for buffers to show up		...
 *
 *	...					send completion irq
 *						irq handler signals flip_done
 *	cleanup old buffers
 *
 * 	signal cleanup_done
 *
 * 	wait for flip_done		<----
 * 	clean up atomic state
 *
 * The important bit to know is that &cleanup_done is the terminal event, but the
 * ordering between &flip_done and &hw_done is entirely up to the specific driver
 * and modeset state change.
 *
 * For an implementation of how to use this look at
 * drm_atomic_helper_setup_commit() from the atomic helper library.
 */
struct drm_crtc_commit {
	/**
	 * @crtc:
	 *
	 * DRM CRTC for this commit.
	 */
	struct drm_crtc *crtc;

	/**
	 * @ref:
	 *
	 * Reference count for this structure. Needed to allow blocking on
	 * completions without the risk of the completion disappearing
	 * meanwhile.
	 */
	struct kref ref;

	/**
	 * @flip_done:
	 *
	 * Will be signaled when the hardware has flipped to the new set of
	 * buffers. Signals at the same time as when the drm event for this
	 * commit is sent to userspace, or when an out-fence is singalled. Note
	 * that for most hardware, in most cases this happens after @hw_done is
	 * signalled.
	 *
	 * Completion of this stage is signalled implicitly by calling
	 * drm_crtc_send_vblank_event() on &drm_crtc_state.event.
	 */
	struct completion flip_done;

	/**
	 * @hw_done:
	 *
	 * Will be signalled when all hw register changes for this commit have
	 * been written out. Especially when disabling a pipe this can be much
	 * later than than @flip_done, since that can signal already when the
	 * screen goes black, whereas to fully shut down a pipe more register
	 * I/O is required.
	 *
	 * Note that this does not need to include separately reference-counted
	 * resources like backing storage buffer pinning, or runtime pm
	 * management.
	 *
	 * Drivers should call drm_atomic_helper_commit_hw_done() to signal
	 * completion of this stage.
	 */
	struct completion hw_done;

	/**
	 * @cleanup_done:
	 *
	 * Will be signalled after old buffers have been cleaned up by calling
	 * drm_atomic_helper_cleanup_planes(). Since this can only happen after
	 * a vblank wait completed it might be a bit later. This completion is
	 * useful to throttle updates and avoid hardware updates getting ahead
	 * of the buffer cleanup too much.
	 *
	 * Drivers should call drm_atomic_helper_commit_cleanup_done() to signal
	 * completion of this stage.
	 */
	struct completion cleanup_done;

	/**
	 * @commit_entry:
	 *
	 * Entry on the per-CRTC &drm_crtc.commit_list. Protected by
	 * $drm_crtc.commit_lock.
	 */
	struct list_head commit_entry;

	/**
	 * @event:
	 *
	 * &drm_pending_vblank_event pointer to clean up private events.
	 */
	struct drm_pending_vblank_event *event;

	/**
	 * @abort_completion:
	 *
	 * A flag that's set after drm_atomic_helper_setup_commit() takes a
	 * second reference for the completion of $drm_crtc_state.event. It's
	 * used by the free code to remove the second reference if commit fails.
	 */
	bool abort_completion;
};

struct __drm_planes_state {
	struct drm_plane *ptr;
	struct drm_plane_state *state, *old_state, *new_state;
};

struct __drm_crtcs_state {
	struct drm_crtc *ptr;
	struct drm_crtc_state *state, *old_state, *new_state;

	/**
	 * @commit:
	 *
	 * A reference to the CRTC commit object that is kept for use by
	 * drm_atomic_helper_wait_for_flip_done() after
	 * drm_atomic_helper_commit_hw_done() is called. This ensures that a
	 * concurrent commit won't free a commit object that is still in use.
	 */
	struct drm_crtc_commit *commit;

	s32 __user *out_fence_ptr;
	u64 last_vblank_count;
};

struct __drm_connnectors_state {
	struct drm_connector *ptr;
	struct drm_connector_state *state, *old_state, *new_state;
	/**
	 * @out_fence_ptr:
	 *
	 * User-provided pointer which the kernel uses to return a sync_file
	 * file descriptor. Used by writeback connectors to signal completion of
	 * the writeback.
	 */
	s32 __user *out_fence_ptr;
};

struct drm_private_obj;
struct drm_private_state;

/**
 * struct drm_private_state_funcs - atomic state functions for private objects
 *
 * These hooks are used by atomic helpers to create, swap and destroy states of
 * private objects. The structure itself is used as a vtable to identify the
 * associated private object type. Each private object type that needs to be
 * added to the atomic states is expected to have an implementation of these
 * hooks and pass a pointer to its drm_private_state_funcs struct to
 * drm_atomic_get_private_obj_state().
 */
struct drm_private_state_funcs {
	/**
	 * @atomic_duplicate_state:
	 *
	 * Duplicate the current state of the private object and return it. It
	 * is an error to call this before obj->state has been initialized.
	 *
	 * RETURNS:
	 *
	 * Duplicated atomic state or NULL when obj->state is not
	 * initialized or allocation failed.
	 */
	struct drm_private_state *(*atomic_duplicate_state)(struct drm_private_obj *obj);

	/**
	 * @atomic_destroy_state:
	 *
	 * Frees the private object state created with @atomic_duplicate_state.
	 */
	void (*atomic_destroy_state)(struct drm_private_obj *obj,
				     struct drm_private_state *state);
};

/**
 * struct drm_private_obj - base struct for driver private atomic object
 *
 * A driver private object is initialized by calling
 * drm_atomic_private_obj_init() and cleaned up by calling
 * drm_atomic_private_obj_fini().
 *
 * Currently only tracks the state update functions and the opaque driver
 * private state itself, but in the future might also track which
 * &drm_modeset_lock is required to duplicate and update this object's state.
 *
 * All private objects must be initialized before the DRM device they are
 * attached to is registered to the DRM subsystem (call to drm_dev_register())
 * and should stay around until this DRM device is unregistered (call to
 * drm_dev_unregister()). In other words, private objects lifetime is tied
 * to the DRM device lifetime. This implies that:
 *
 * 1/ all calls to drm_atomic_private_obj_init() must be done before calling
 *    drm_dev_register()
 * 2/ all calls to drm_atomic_private_obj_fini() must be done after calling
 *    drm_dev_unregister()
 */
struct drm_private_obj {
	/**
	 * @head: List entry used to attach a private object to a &drm_device
	 * (queued to &drm_mode_config.privobj_list).
	 */
	struct list_head head;

	/**
	 * @lock: Modeset lock to protect the state object.
	 */
	struct drm_modeset_lock lock;

	/**
	 * @state: Current atomic state for this driver private object.
	 */
	struct drm_private_state *state;

	/**
	 * @funcs:
	 *
	 * Functions to manipulate the state of this driver private object, see
	 * &drm_private_state_funcs.
	 */
	const struct drm_private_state_funcs *funcs;
};

/**
 * drm_for_each_privobj() - private object iterator
 *
 * @privobj: pointer to the current private object. Updated after each
 *	     iteration
 * @dev: the DRM device we want get private objects from
 *
 * Allows one to iterate over all private objects attached to @dev
 */
#define drm_for_each_privobj(privobj, dev) \
	list_for_each_entry(privobj, &(dev)->mode_config.privobj_list, head)

/**
 * struct drm_private_state - base struct for driver private object state
 * @state: backpointer to global drm_atomic_state
 *
 * Currently only contains a backpointer to the overall atomic update, but in
 * the future also might hold synchronization information similar to e.g.
 * &drm_crtc.commit.
 */
struct drm_private_state {
	struct drm_atomic_state *state;
};

struct __drm_private_objs_state {
	struct drm_private_obj *ptr;
	struct drm_private_state *state, *old_state, *new_state;
};

/**
 * struct drm_atomic_state - the global state object for atomic updates
 * @ref: count of all references to this state (will not be freed until zero)
 * @dev: parent DRM device
 * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
 * @async_update: hint for asynchronous plane update
 * @planes: pointer to array of structures with per-plane data
 * @crtcs: pointer to array of CRTC pointers
 * @num_connector: size of the @connectors and @connector_states arrays
 * @connectors: pointer to array of structures with per-connector data
 * @num_private_objs: size of the @private_objs array
 * @private_objs: pointer to array of private object pointers
 * @acquire_ctx: acquire context for this atomic modeset state update
 *
 * States are added to an atomic update by calling drm_atomic_get_crtc_state(),
 * drm_atomic_get_plane_state(), drm_atomic_get_connector_state(), or for
 * private state structures, drm_atomic_get_private_obj_state().
 */
struct drm_atomic_state {
	struct kref ref;

	struct drm_device *dev;

	/**
	 * @allow_modeset:
	 *
	 * Allow full modeset. This is used by the ATOMIC IOCTL handler to
	 * implement the DRM_MODE_ATOMIC_ALLOW_MODESET flag. Drivers should
	 * never consult this flag, instead looking at the output of
	 * drm_atomic_crtc_needs_modeset().
	 */
	bool allow_modeset : 1;
	bool legacy_cursor_update : 1;
	bool async_update : 1;
	/**
	 * @duplicated:
	 *
	 * Indicates whether or not this atomic state was duplicated using
	 * drm_atomic_helper_duplicate_state(). Drivers and atomic helpers
	 * should use this to fixup normal  inconsistencies in duplicated
	 * states.
	 */
	bool duplicated : 1;
	struct __drm_planes_state *planes;
	struct __drm_crtcs_state *crtcs;
	int num_connector;
	struct __drm_connnectors_state *connectors;
	int num_private_objs;
	struct __drm_private_objs_state *private_objs;

	struct drm_modeset_acquire_ctx *acquire_ctx;

	/**
	 * @fake_commit:
	 *
	 * Used for signaling unbound planes/connectors.
	 * When a connector or plane is not bound to any CRTC, it's still important
	 * to preserve linearity to prevent the atomic states from being freed to early.
	 *
	 * This commit (if set) is not bound to any CRTC, but will be completed when
	 * drm_atomic_helper_commit_hw_done() is called.
	 */
	struct drm_crtc_commit *fake_commit;

	/**
	 * @commit_work:
	 *
	 * Work item which can be used by the driver or helpers to execute the
	 * commit without blocking.
	 */
	struct work_struct commit_work;
};

void __drm_crtc_commit_free(struct kref *kref);

/**
 * drm_crtc_commit_get - acquire a reference to the CRTC commit
 * @commit: CRTC commit
 *
 * Increases the reference of @commit.
 *
 * Returns:
 * The pointer to @commit, with reference increased.
 */
static inline struct drm_crtc_commit *drm_crtc_commit_get(struct drm_crtc_commit *commit)
{
	kref_get(&commit->ref);
	return commit;
}

/**
 * drm_crtc_commit_put - release a reference to the CRTC commmit
 * @commit: CRTC commit
 *
 * This releases a reference to @commit which is freed after removing the
 * final reference. No locking required and callable from any context.
 */
static inline void drm_crtc_commit_put(struct drm_crtc_commit *commit)
{
	kref_put(&commit->ref, __drm_crtc_commit_free);
}

struct drm_atomic_state * __must_check
drm_atomic_state_alloc(struct drm_device *dev);
void drm_atomic_state_clear(struct drm_atomic_state *state);

/**
 * drm_atomic_state_get - acquire a reference to the atomic state
 * @state: The atomic state
 *
 * Returns a new reference to the @state
 */
static inline struct drm_atomic_state *
drm_atomic_state_get(struct drm_atomic_state *state)
{
	kref_get(&state->ref);
	return state;
}

void __drm_atomic_state_free(struct kref *ref);

/**
 * drm_atomic_state_put - release a reference to the atomic state
 * @state: The atomic state
 *
 * This releases a reference to @state which is freed after removing the
 * final reference. No locking required and callable from any context.
 */
static inline void drm_atomic_state_put(struct drm_atomic_state *state)
{
	kref_put(&state->ref, __drm_atomic_state_free);
}

int  __must_check
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
void drm_atomic_state_default_clear(struct drm_atomic_state *state);
void drm_atomic_state_default_release(struct drm_atomic_state *state);

struct drm_crtc_state * __must_check
drm_atomic_get_crtc_state(struct drm_atomic_state *state,
			  struct drm_crtc *crtc);
struct drm_plane_state * __must_check
drm_atomic_get_plane_state(struct drm_atomic_state *state,
			   struct drm_plane *plane);
struct drm_connector_state * __must_check
drm_atomic_get_connector_state(struct drm_atomic_state *state,
			       struct drm_connector *connector);

void drm_atomic_private_obj_init(struct drm_device *dev,
				 struct drm_private_obj *obj,
				 struct drm_private_state *state,
				 const struct drm_private_state_funcs *funcs);
void drm_atomic_private_obj_fini(struct drm_private_obj *obj);

struct drm_private_state * __must_check
drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
				 struct drm_private_obj *obj);
struct drm_private_state *
drm_atomic_get_old_private_obj_state(struct drm_atomic_state *state,
				     struct drm_private_obj *obj);
struct drm_private_state *
drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
				     struct drm_private_obj *obj);

struct drm_connector *
drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state,
					 struct drm_encoder *encoder);
struct drm_connector *
drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state,
					 struct drm_encoder *encoder);

/**
 * drm_atomic_get_existing_crtc_state - get CRTC state, if it exists
 * @state: global atomic state object
 * @crtc: CRTC to grab
 *
 * This function returns the CRTC state for the given CRTC, or NULL
 * if the CRTC is not part of the global atomic state.
 *
 * This function is deprecated, @drm_atomic_get_old_crtc_state or
 * @drm_atomic_get_new_crtc_state should be used instead.
 */
static inline struct drm_crtc_state *
drm_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
				   struct drm_crtc *crtc)
{
	return state->crtcs[drm_crtc_index(crtc)].state;
}

/**
 * drm_atomic_get_old_crtc_state - get old CRTC state, if it exists
 * @state: global atomic state object
 * @crtc: CRTC to grab
 *
 * This function returns the old CRTC state for the given CRTC, or
 * NULL if the CRTC is not part of the global atomic state.
 */
static inline struct drm_crtc_state *
drm_atomic_get_old_crtc_state(struct drm_atomic_state *state,
			      struct drm_crtc *crtc)
{
	return state->crtcs[drm_crtc_index(crtc)].old_state;
}
/**
 * drm_atomic_get_new_crtc_state - get new CRTC state, if it exists
 * @state: global atomic state object
 * @crtc: CRTC to grab
 *
 * This function returns the new CRTC state for the given CRTC, or
 * NULL if the CRTC is not part of the global atomic state.
 */
static inline struct drm_crtc_state *
drm_atomic_get_new_crtc_state(struct drm_atomic_state *state,
			      struct drm_crtc *crtc)
{
	return state->crtcs[drm_crtc_index(crtc)].new_state;
}

/**
 * drm_atomic_get_existing_plane_state - get plane state, if it exists
 * @state: global atomic state object
 * @plane: plane to grab
 *
 * This function returns the plane state for the given plane, or NULL
 * if the plane is not part of the global atomic state.
 *
 * This function is deprecated, @drm_atomic_get_old_plane_state or
 * @drm_atomic_get_new_plane_state should be used instead.
 */
static inline struct drm_plane_state *
drm_atomic_get_existing_plane_state(struct drm_atomic_state *state,
				    struct drm_plane *plane)
{
	return state->planes[drm_plane_index(plane)].state;
}

/**
 * drm_atomic_get_old_plane_state - get plane state, if it exists
 * @state: global atomic state object
 * @plane: plane to grab
 *
 * This function returns the old plane state for the given plane, or
 * NULL if the plane is not part of the global atomic state.
 */
static inline struct drm_plane_state *
drm_atomic_get_old_plane_state(struct drm_atomic_state *state,
			       struct drm_plane *plane)
{
	return state->planes[drm_plane_index(plane)].old_state;
}

/**
 * drm_atomic_get_new_plane_state - get plane state, if it exists
 * @state: global atomic state object
 * @plane: plane to grab
 *
 * This function returns the new plane state for the given plane, or
 * NULL if the plane is not part of the global atomic state.
 */
static inline struct drm_plane_state *
drm_atomic_get_new_plane_state(struct drm_atomic_state *state,
			       struct drm_plane *plane)
{
	return state->planes[drm_plane_index(plane)].new_state;
}

/**
 * drm_atomic_get_existing_connector_state - get connector state, if it exists
 * @state: global atomic state object
 * @connector: connector to grab
 *
 * This function returns the connector state for the given connector,
 * or NULL if the connector is not part of the global atomic state.
 *
 * This function is deprecated, @drm_atomic_get_old_connector_state or
 * @drm_atomic_get_new_connector_state should be used instead.
 */
static inline struct drm_connector_state *
drm_atomic_get_existing_connector_state(struct drm_atomic_state *state,
					struct drm_connector *connector)
{
	int index = drm_connector_index(connector);

	if (index >= state->num_connector)
		return NULL;

	return state->connectors[index].state;
}

/**
 * drm_atomic_get_old_connector_state - get connector state, if it exists
 * @state: global atomic state object
 * @connector: connector to grab
 *
 * This function returns the old connector state for the given connector,
 * or NULL if the connector is not part of the global atomic state.
 */
static inline struct drm_connector_state *
drm_atomic_get_old_connector_state(struct drm_atomic_state *state,
				   struct drm_connector *connector)
{
	int index = drm_connector_index(connector);

	if (index >= state->num_connector)
		return NULL;

	return state->connectors[index].old_state;
}

/**
 * drm_atomic_get_new_connector_state - get connector state, if it exists
 * @state: global atomic state object
 * @connector: connector to grab
 *
 * This function returns the new connector state for the given connector,
 * or NULL if the connector is not part of the global atomic state.
 */
static inline struct drm_connector_state *
drm_atomic_get_new_connector_state(struct drm_atomic_state *state,
				   struct drm_connector *connector)
{
	int index = drm_connector_index(connector);

	if (index >= state->num_connector)
		return NULL;

	return state->connectors[index].new_state;
}

/**
 * __drm_atomic_get_current_plane_state - get current plane state
 * @state: global atomic state object
 * @plane: plane to grab
 *
 * This function returns the plane state for the given plane, either from
 * @state, or if the plane isn't part of the atomic state update, from @plane.
 * This is useful in atomic check callbacks, when drivers need to peek at, but
 * not change, state of other planes, since it avoids threading an error code
 * back up the call chain.
 *
 * WARNING:
 *
 * Note that this function is in general unsafe since it doesn't check for the
 * required locking for access state structures. Drivers must ensure that it is
 * safe to access the returned state structure through other means. One common
 * example is when planes are fixed to a single CRTC, and the driver knows that
 * the CRTC lock is held already. In that case holding the CRTC lock gives a
 * read-lock on all planes connected to that CRTC. But if planes can be
 * reassigned things get more tricky. In that case it's better to use
 * drm_atomic_get_plane_state and wire up full error handling.
 *
 * Returns:
 *
 * Read-only pointer to the current plane state.
 */
static inline const struct drm_plane_state *
__drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
				     struct drm_plane *plane)
{
	if (state->planes[drm_plane_index(plane)].state)
		return state->planes[drm_plane_index(plane)].state;

	return plane->state;
}

int __must_check
drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
				   struct drm_crtc *crtc);
int __must_check
drm_atomic_add_affected_planes(struct drm_atomic_state *state,
			       struct drm_crtc *crtc);

int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
int __must_check drm_atomic_commit(struct drm_atomic_state *state);
int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);

void drm_state_dump(struct drm_device *dev, struct drm_printer *p);

/**
 * for_each_oldnew_connector_in_state - iterate over all connectors in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @connector: &struct drm_connector iteration cursor
 * @old_connector_state: &struct drm_connector_state iteration cursor for the
 * 	old state
 * @new_connector_state: &struct drm_connector_state iteration cursor for the
 * 	new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all connectors in an atomic update, tracking both old and
 * new state. This is useful in places where the state delta needs to be
 * considered, for example in atomic check functions.
 */
#define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
	for ((__i) = 0;								\
	     (__i) < (__state)->num_connector;					\
	     (__i)++)								\
		for_each_if ((__state)->connectors[__i].ptr &&			\
			     ((connector) = (__state)->connectors[__i].ptr,	\
			     (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
			     (old_connector_state) = (__state)->connectors[__i].old_state,	\
			     (new_connector_state) = (__state)->connectors[__i].new_state, 1))

/**
 * for_each_old_connector_in_state - iterate over all connectors in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @connector: &struct drm_connector iteration cursor
 * @old_connector_state: &struct drm_connector_state iteration cursor for the
 * 	old state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all connectors in an atomic update, tracking only the old
 * state. This is useful in disable functions, where we need the old state the
 * hardware is still in.
 */
#define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
	for ((__i) = 0;								\
	     (__i) < (__state)->num_connector;					\
	     (__i)++)								\
		for_each_if ((__state)->connectors[__i].ptr &&			\
			     ((connector) = (__state)->connectors[__i].ptr,	\
			     (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
			     (old_connector_state) = (__state)->connectors[__i].old_state, 1))

/**
 * for_each_new_connector_in_state - iterate over all connectors in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @connector: &struct drm_connector iteration cursor
 * @new_connector_state: &struct drm_connector_state iteration cursor for the
 * 	new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all connectors in an atomic update, tracking only the new
 * state. This is useful in enable functions, where we need the new state the
 * hardware should be in when the atomic commit operation has completed.
 */
#define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
	for ((__i) = 0;								\
	     (__i) < (__state)->num_connector;					\
	     (__i)++)								\
		for_each_if ((__state)->connectors[__i].ptr &&			\
			     ((connector) = (__state)->connectors[__i].ptr,	\
			     (void)(connector) /* Only to avoid unused-but-set-variable warning */, \
			     (new_connector_state) = (__state)->connectors[__i].new_state, \
			     (void)(new_connector_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
 * for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @crtc: &struct drm_crtc iteration cursor
 * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
 * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all CRTCs in an atomic update, tracking both old and
 * new state. This is useful in places where the state delta needs to be
 * considered, for example in atomic check functions.
 */
#define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_crtc;		\
	     (__i)++)							\
		for_each_if ((__state)->crtcs[__i].ptr &&		\
			     ((crtc) = (__state)->crtcs[__i].ptr,	\
			      (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
			     (old_crtc_state) = (__state)->crtcs[__i].old_state, \
			     (void)(old_crtc_state) /* Only to avoid unused-but-set-variable warning */, \
			     (new_crtc_state) = (__state)->crtcs[__i].new_state, 1))

/**
 * for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @crtc: &struct drm_crtc iteration cursor
 * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all CRTCs in an atomic update, tracking only the old
 * state. This is useful in disable functions, where we need the old state the
 * hardware is still in.
 */
#define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i)	\
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_crtc;		\
	     (__i)++)							\
		for_each_if ((__state)->crtcs[__i].ptr &&		\
			     ((crtc) = (__state)->crtcs[__i].ptr,	\
			     (old_crtc_state) = (__state)->crtcs[__i].old_state, 1))

/**
 * for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @crtc: &struct drm_crtc iteration cursor
 * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all CRTCs in an atomic update, tracking only the new
 * state. This is useful in enable functions, where we need the new state the
 * hardware should be in when the atomic commit operation has completed.
 */
#define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i)	\
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_crtc;		\
	     (__i)++)							\
		for_each_if ((__state)->crtcs[__i].ptr &&		\
			     ((crtc) = (__state)->crtcs[__i].ptr,	\
			     (void)(crtc) /* Only to avoid unused-but-set-variable warning */, \
			     (new_crtc_state) = (__state)->crtcs[__i].new_state, \
			     (void)(new_crtc_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
 * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @plane: &struct drm_plane iteration cursor
 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all planes in an atomic update, tracking both old and
 * new state. This is useful in places where the state delta needs to be
 * considered, for example in atomic check functions.
 */
#define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_total_plane;	\
	     (__i)++)							\
		for_each_if ((__state)->planes[__i].ptr &&		\
			     ((plane) = (__state)->planes[__i].ptr,	\
			      (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
			      (old_plane_state) = (__state)->planes[__i].old_state,\
			      (new_plane_state) = (__state)->planes[__i].new_state, 1))

/**
 * for_each_oldnew_plane_in_state_reverse - iterate over all planes in an atomic
 * update in reverse order
 * @__state: &struct drm_atomic_state pointer
 * @plane: &struct drm_plane iteration cursor
 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all planes in an atomic update in reverse order,
 * tracking both old and  new state. This is useful in places where the
 * state delta needs to be considered, for example in atomic check functions.
 */
#define for_each_oldnew_plane_in_state_reverse(__state, plane, old_plane_state, new_plane_state, __i) \
	for ((__i) = ((__state)->dev->mode_config.num_total_plane - 1);	\
	     (__i) >= 0;						\
	     (__i)--)							\
		for_each_if ((__state)->planes[__i].ptr &&		\
			     ((plane) = (__state)->planes[__i].ptr,	\
			      (old_plane_state) = (__state)->planes[__i].old_state,\
			      (new_plane_state) = (__state)->planes[__i].new_state, 1))

/**
 * for_each_old_plane_in_state - iterate over all planes in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @plane: &struct drm_plane iteration cursor
 * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all planes in an atomic update, tracking only the old
 * state. This is useful in disable functions, where we need the old state the
 * hardware is still in.
 */
#define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_total_plane;	\
	     (__i)++)							\
		for_each_if ((__state)->planes[__i].ptr &&		\
			     ((plane) = (__state)->planes[__i].ptr,	\
			      (old_plane_state) = (__state)->planes[__i].old_state, 1))
/**
 * for_each_new_plane_in_state - iterate over all planes in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @plane: &struct drm_plane iteration cursor
 * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all planes in an atomic update, tracking only the new
 * state. This is useful in enable functions, where we need the new state the
 * hardware should be in when the atomic commit operation has completed.
 */
#define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_total_plane;	\
	     (__i)++)							\
		for_each_if ((__state)->planes[__i].ptr &&		\
			     ((plane) = (__state)->planes[__i].ptr,	\
			      (void)(plane) /* Only to avoid unused-but-set-variable warning */, \
			      (new_plane_state) = (__state)->planes[__i].new_state, \
			      (void)(new_plane_state) /* Only to avoid unused-but-set-variable warning */, 1))

/**
 * for_each_oldnew_private_obj_in_state - iterate over all private objects in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @obj: &struct drm_private_obj iteration cursor
 * @old_obj_state: &struct drm_private_state iteration cursor for the old state
 * @new_obj_state: &struct drm_private_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all private objects in an atomic update, tracking both
 * old and new state. This is useful in places where the state delta needs
 * to be considered, for example in atomic check functions.
 */
#define for_each_oldnew_private_obj_in_state(__state, obj, old_obj_state, new_obj_state, __i) \
	for ((__i) = 0; \
	     (__i) < (__state)->num_private_objs && \
		     ((obj) = (__state)->private_objs[__i].ptr, \
		      (old_obj_state) = (__state)->private_objs[__i].old_state,	\
		      (new_obj_state) = (__state)->private_objs[__i].new_state, 1); \
	     (__i)++)

/**
 * for_each_old_private_obj_in_state - iterate over all private objects in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @obj: &struct drm_private_obj iteration cursor
 * @old_obj_state: &struct drm_private_state iteration cursor for the old state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all private objects in an atomic update, tracking only
 * the old state. This is useful in disable functions, where we need the old
 * state the hardware is still in.
 */
#define for_each_old_private_obj_in_state(__state, obj, old_obj_state, __i) \
	for ((__i) = 0; \
	     (__i) < (__state)->num_private_objs && \
		     ((obj) = (__state)->private_objs[__i].ptr, \
		      (old_obj_state) = (__state)->private_objs[__i].old_state, 1); \
	     (__i)++)

/**
 * for_each_new_private_obj_in_state - iterate over all private objects in an atomic update
 * @__state: &struct drm_atomic_state pointer
 * @obj: &struct drm_private_obj iteration cursor
 * @new_obj_state: &struct drm_private_state iteration cursor for the new state
 * @__i: int iteration cursor, for macro-internal use
 *
 * This iterates over all private objects in an atomic update, tracking only
 * the new state. This is useful in enable functions, where we need the new state the
 * hardware should be in when the atomic commit operation has completed.
 */
#define for_each_new_private_obj_in_state(__state, obj, new_obj_state, __i) \
	for ((__i) = 0; \
	     (__i) < (__state)->num_private_objs && \
		     ((obj) = (__state)->private_objs[__i].ptr, \
		      (new_obj_state) = (__state)->private_objs[__i].new_state, 1); \
	     (__i)++)

/**
 * drm_atomic_crtc_needs_modeset - compute combined modeset need
 * @state: &drm_crtc_state for the CRTC
 *
 * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
 * whether the state CRTC changed enough to need a full modeset cycle:
 * mode_changed, active_changed and connectors_changed. This helper simply
 * combines these three to compute the overall need for a modeset for @state.
 *
 * The atomic helper code sets these booleans, but drivers can and should
 * change them appropriately to accurately represent whether a modeset is
 * really needed. In general, drivers should avoid full modesets whenever
 * possible.
 *
 * For example if the CRTC mode has changed, and the hardware is able to enact
 * the requested mode change without going through a full modeset, the driver
 * should clear mode_changed in its &drm_mode_config_funcs.atomic_check
 * implementation.
 */
static inline bool
drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
{
	return state->mode_changed || state->active_changed ||
	       state->connectors_changed;
}

/**
 * drm_atomic_crtc_effectively_active - compute whether CRTC is actually active
 * @state: &drm_crtc_state for the CRTC
 *
 * When in self refresh mode, the crtc_state->active value will be false, since
 * the CRTC is off. However in some cases we're interested in whether the CRTC
 * is active, or effectively active (ie: it's connected to an active display).
 * In these cases, use this function instead of just checking active.
 */
static inline bool
drm_atomic_crtc_effectively_active(const struct drm_crtc_state *state)
{
	return state->active || state->self_refresh_active;
}

#endif /* DRM_ATOMIC_H_ */