summaryrefslogtreecommitdiffstats
path: root/include/drm/drm_atomic.h
blob: f96220ed40046e2ddc3e4a7cc0944119bde7ca28 (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
/*
 * 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>

/**
 * 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.
	 */
	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.
	 */
	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.
	 */
	struct completion cleanup_done;

	/**
	 * @commit_entry:
	 *
	 * Entry on the per-CRTC commit_list. Protected by 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;
};

struct __drm_planes_state {
	struct drm_plane *ptr;
	struct drm_plane_state *state;
};

struct __drm_crtcs_state {
	struct drm_crtc *ptr;
	struct drm_crtc_state *state;
	struct drm_crtc_commit *commit;
	s64 __user *out_fence_ptr;
	unsigned last_vblank_count;
};

struct __drm_connnectors_state {
	struct drm_connector *ptr;
	struct drm_connector_state *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
 * @allow_modeset: allow full modeset
 * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
 * @legacy_set_config: Disable conflicting encoders instead of failing with -EINVAL.
 * @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
 * @acquire_ctx: acquire context for this atomic modeset state update
 */
struct drm_atomic_state {
	struct kref ref;

	struct drm_device *dev;
	bool allow_modeset : 1;
	bool legacy_cursor_update : 1;
	bool legacy_set_config : 1;
	struct __drm_planes_state *planes;
	struct __drm_crtcs_state *crtcs;
	int num_connector;
	struct __drm_connnectors_state *connectors;

	struct drm_modeset_acquire_ctx *acquire_ctx;

	/**
	 * @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.
 */
static inline void drm_crtc_commit_get(struct drm_crtc_commit *commit)
{
	kref_get(&commit->ref);
}

/**
 * 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);
int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
		struct drm_crtc_state *state, struct drm_property *property,
		uint64_t val);
struct drm_plane_state * __must_check
drm_atomic_get_plane_state(struct drm_atomic_state *state,
			   struct drm_plane *plane);
int drm_atomic_plane_set_property(struct drm_plane *plane,
		struct drm_plane_state *state, struct drm_property *property,
		uint64_t val);
struct drm_connector_state * __must_check
drm_atomic_get_connector_state(struct drm_atomic_state *state,
			       struct drm_connector *connector);
int drm_atomic_connector_set_property(struct drm_connector *connector,
		struct drm_connector_state *state, struct drm_property *property,
		uint64_t val);

/**
 * 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.
 */
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_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.
 */
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_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.
 */
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_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_set_mode_for_crtc(struct drm_crtc_state *state,
			     struct drm_display_mode *mode);
int __must_check
drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
				  struct drm_property_blob *blob);
int __must_check
drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
			      struct drm_crtc *crtc);
void drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
				 struct drm_framebuffer *fb);
void drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
				    struct dma_fence *fence);
int __must_check
drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
				  struct drm_crtc *crtc);
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);

void drm_atomic_legacy_backoff(struct drm_atomic_state *state);

void
drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);

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);

#define for_each_connector_in_state(__state, connector, connector_state, __i) \
	for ((__i) = 0;							\
	     (__i) < (__state)->num_connector &&				\
	     ((connector) = (__state)->connectors[__i].ptr,			\
	     (connector_state) = (__state)->connectors[__i].state, 1); 	\
	     (__i)++)							\
		for_each_if (connector)

#define for_each_crtc_in_state(__state, crtc, crtc_state, __i)	\
	for ((__i) = 0;						\
	     (__i) < (__state)->dev->mode_config.num_crtc &&	\
	     ((crtc) = (__state)->crtcs[__i].ptr,			\
	     (crtc_state) = (__state)->crtcs[__i].state, 1);	\
	     (__i)++)						\
		for_each_if (crtc_state)

#define for_each_plane_in_state(__state, plane, plane_state, __i)		\
	for ((__i) = 0;							\
	     (__i) < (__state)->dev->mode_config.num_total_plane &&	\
	     ((plane) = (__state)->planes[__i].ptr,				\
	     (plane_state) = (__state)->planes[__i].state, 1);		\
	     (__i)++)							\
		for_each_if (plane_state)

/**
 * 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:
 * connectors_changed, mode_changed and active_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 during its ->atomic_check.
 */
static inline bool
drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
{
	return state->mode_changed || state->active_changed ||
	       state->connectors_changed;
}

#endif /* DRM_ATOMIC_H_ */