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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/drm/drm_atomic.h
2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
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9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
31 #include <drm/drm_crtc.h>
34 * struct drm_crtc_commit - track modeset commits on a CRTC
36 * This structure is used to track pending modeset changes and atomic commit on
37 * a per-CRTC basis. Since updating the list should never block this structure
38 * is reference counted to allow waiters to safely wait on an event to complete,
39 * without holding any locks.
41 * It has 3 different events in total to allow a fine-grained synchronization
42 * between outstanding updates::
44 * atomic commit thread hardware
46 * write new state into hardware ----> ...
48 * switch to new state on next
51 * wait for buffers to show up ...
53 * ... send completion irq
54 * irq handler signals flip_done
59 * wait for flip_done <----
60 * clean up atomic state
62 * The important bit to know is that cleanup_done is the terminal event, but the
63 * ordering between flip_done and hw_done is entirely up to the specific driver
64 * and modeset state change.
66 * For an implementation of how to use this look at
67 * drm_atomic_helper_setup_commit() from the atomic helper library.
69 struct drm_crtc_commit
{
73 * DRM CRTC for this commit.
75 struct drm_crtc
*crtc
;
80 * Reference count for this structure. Needed to allow blocking on
81 * completions without the risk of the completion disappearing
89 * Will be signaled when the hardware has flipped to the new set of
90 * buffers. Signals at the same time as when the drm event for this
91 * commit is sent to userspace, or when an out-fence is singalled. Note
92 * that for most hardware, in most cases this happens after @hw_done is
95 struct completion flip_done
;
100 * Will be signalled when all hw register changes for this commit have
101 * been written out. Especially when disabling a pipe this can be much
102 * later than than @flip_done, since that can signal already when the
103 * screen goes black, whereas to fully shut down a pipe more register
106 * Note that this does not need to include separately reference-counted
107 * resources like backing storage buffer pinning, or runtime pm
110 struct completion hw_done
;
115 * Will be signalled after old buffers have been cleaned up by calling
116 * drm_atomic_helper_cleanup_planes(). Since this can only happen after
117 * a vblank wait completed it might be a bit later. This completion is
118 * useful to throttle updates and avoid hardware updates getting ahead
119 * of the buffer cleanup too much.
121 struct completion cleanup_done
;
126 * Entry on the per-CRTC commit_list. Protected by crtc->commit_lock.
128 struct list_head commit_entry
;
133 * &drm_pending_vblank_event pointer to clean up private events.
135 struct drm_pending_vblank_event
*event
;
138 struct __drm_planes_state
{
139 struct drm_plane
*ptr
;
140 struct drm_plane_state
*state
;
143 struct __drm_crtcs_state
{
144 struct drm_crtc
*ptr
;
145 struct drm_crtc_state
*state
;
146 struct drm_crtc_commit
*commit
;
147 s64 __user
*out_fence_ptr
;
148 unsigned last_vblank_count
;
151 struct __drm_connnectors_state
{
152 struct drm_connector
*ptr
;
153 struct drm_connector_state
*state
;
157 * struct drm_atomic_state - the global state object for atomic updates
158 * @ref: count of all references to this state (will not be freed until zero)
159 * @dev: parent DRM device
160 * @allow_modeset: allow full modeset
161 * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
162 * @legacy_set_config: Disable conflicting encoders instead of failing with -EINVAL.
163 * @planes: pointer to array of structures with per-plane data
164 * @crtcs: pointer to array of CRTC pointers
165 * @num_connector: size of the @connectors and @connector_states arrays
166 * @connectors: pointer to array of structures with per-connector data
167 * @acquire_ctx: acquire context for this atomic modeset state update
169 struct drm_atomic_state
{
172 struct drm_device
*dev
;
173 bool allow_modeset
: 1;
174 bool legacy_cursor_update
: 1;
175 bool legacy_set_config
: 1;
176 struct __drm_planes_state
*planes
;
177 struct __drm_crtcs_state
*crtcs
;
179 struct __drm_connnectors_state
*connectors
;
181 struct drm_modeset_acquire_ctx
*acquire_ctx
;
186 * Work item which can be used by the driver or helpers to execute the
187 * commit without blocking.
189 struct work_struct commit_work
;
192 void __drm_crtc_commit_free(struct kref
*kref
);
195 * drm_crtc_commit_get - acquire a reference to the CRTC commit
196 * @commit: CRTC commit
198 * Increases the reference of @commit.
200 static inline void drm_crtc_commit_get(struct drm_crtc_commit
*commit
)
202 kref_get(&commit
->ref
);
206 * drm_crtc_commit_put - release a reference to the CRTC commmit
207 * @commit: CRTC commit
209 * This releases a reference to @commit which is freed after removing the
210 * final reference. No locking required and callable from any context.
212 static inline void drm_crtc_commit_put(struct drm_crtc_commit
*commit
)
214 kref_put(&commit
->ref
, __drm_crtc_commit_free
);
217 struct drm_atomic_state
* __must_check
218 drm_atomic_state_alloc(struct drm_device
*dev
);
219 void drm_atomic_state_clear(struct drm_atomic_state
*state
);
222 * drm_atomic_state_get - acquire a reference to the atomic state
223 * @state: The atomic state
225 * Returns a new reference to the @state
227 static inline struct drm_atomic_state
*
228 drm_atomic_state_get(struct drm_atomic_state
*state
)
230 kref_get(&state
->ref
);
234 void __drm_atomic_state_free(struct kref
*ref
);
237 * drm_atomic_state_put - release a reference to the atomic state
238 * @state: The atomic state
240 * This releases a reference to @state which is freed after removing the
241 * final reference. No locking required and callable from any context.
243 static inline void drm_atomic_state_put(struct drm_atomic_state
*state
)
245 kref_put(&state
->ref
, __drm_atomic_state_free
);
249 drm_atomic_state_init(struct drm_device
*dev
, struct drm_atomic_state
*state
);
250 void drm_atomic_state_default_clear(struct drm_atomic_state
*state
);
251 void drm_atomic_state_default_release(struct drm_atomic_state
*state
);
253 struct drm_crtc_state
* __must_check
254 drm_atomic_get_crtc_state(struct drm_atomic_state
*state
,
255 struct drm_crtc
*crtc
);
256 int drm_atomic_crtc_set_property(struct drm_crtc
*crtc
,
257 struct drm_crtc_state
*state
, struct drm_property
*property
,
259 struct drm_plane_state
* __must_check
260 drm_atomic_get_plane_state(struct drm_atomic_state
*state
,
261 struct drm_plane
*plane
);
262 int drm_atomic_plane_set_property(struct drm_plane
*plane
,
263 struct drm_plane_state
*state
, struct drm_property
*property
,
265 struct drm_connector_state
* __must_check
266 drm_atomic_get_connector_state(struct drm_atomic_state
*state
,
267 struct drm_connector
*connector
);
268 int drm_atomic_connector_set_property(struct drm_connector
*connector
,
269 struct drm_connector_state
*state
, struct drm_property
*property
,
273 * drm_atomic_get_existing_crtc_state - get crtc state, if it exists
274 * @state: global atomic state object
275 * @crtc: crtc to grab
277 * This function returns the crtc state for the given crtc, or NULL
278 * if the crtc is not part of the global atomic state.
280 static inline struct drm_crtc_state
*
281 drm_atomic_get_existing_crtc_state(struct drm_atomic_state
*state
,
282 struct drm_crtc
*crtc
)
284 return state
->crtcs
[drm_crtc_index(crtc
)].state
;
288 * drm_atomic_get_existing_plane_state - get plane state, if it exists
289 * @state: global atomic state object
290 * @plane: plane to grab
292 * This function returns the plane state for the given plane, or NULL
293 * if the plane is not part of the global atomic state.
295 static inline struct drm_plane_state
*
296 drm_atomic_get_existing_plane_state(struct drm_atomic_state
*state
,
297 struct drm_plane
*plane
)
299 return state
->planes
[drm_plane_index(plane
)].state
;
303 * drm_atomic_get_existing_connector_state - get connector state, if it exists
304 * @state: global atomic state object
305 * @connector: connector to grab
307 * This function returns the connector state for the given connector,
308 * or NULL if the connector is not part of the global atomic state.
310 static inline struct drm_connector_state
*
311 drm_atomic_get_existing_connector_state(struct drm_atomic_state
*state
,
312 struct drm_connector
*connector
)
314 int index
= drm_connector_index(connector
);
316 if (index
>= state
->num_connector
)
319 return state
->connectors
[index
].state
;
323 * __drm_atomic_get_current_plane_state - get current plane state
324 * @state: global atomic state object
325 * @plane: plane to grab
327 * This function returns the plane state for the given plane, either from
328 * @state, or if the plane isn't part of the atomic state update, from @plane.
329 * This is useful in atomic check callbacks, when drivers need to peek at, but
330 * not change, state of other planes, since it avoids threading an error code
331 * back up the call chain.
335 * Note that this function is in general unsafe since it doesn't check for the
336 * required locking for access state structures. Drivers must ensure that it is
337 * safe to access the returned state structure through other means. One common
338 * example is when planes are fixed to a single CRTC, and the driver knows that
339 * the CRTC lock is held already. In that case holding the CRTC lock gives a
340 * read-lock on all planes connected to that CRTC. But if planes can be
341 * reassigned things get more tricky. In that case it's better to use
342 * drm_atomic_get_plane_state and wire up full error handling.
346 * Read-only pointer to the current plane state.
348 static inline const struct drm_plane_state
*
349 __drm_atomic_get_current_plane_state(struct drm_atomic_state
*state
,
350 struct drm_plane
*plane
)
352 if (state
->planes
[drm_plane_index(plane
)].state
)
353 return state
->planes
[drm_plane_index(plane
)].state
;
359 drm_atomic_set_mode_for_crtc(struct drm_crtc_state
*state
,
360 struct drm_display_mode
*mode
);
362 drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state
*state
,
363 struct drm_property_blob
*blob
);
365 drm_atomic_set_crtc_for_plane(struct drm_plane_state
*plane_state
,
366 struct drm_crtc
*crtc
);
367 void drm_atomic_set_fb_for_plane(struct drm_plane_state
*plane_state
,
368 struct drm_framebuffer
*fb
);
369 void drm_atomic_set_fence_for_plane(struct drm_plane_state
*plane_state
,
370 struct dma_fence
*fence
);
372 drm_atomic_set_crtc_for_connector(struct drm_connector_state
*conn_state
,
373 struct drm_crtc
*crtc
);
375 drm_atomic_add_affected_connectors(struct drm_atomic_state
*state
,
376 struct drm_crtc
*crtc
);
378 drm_atomic_add_affected_planes(struct drm_atomic_state
*state
,
379 struct drm_crtc
*crtc
);
381 void drm_atomic_legacy_backoff(struct drm_atomic_state
*state
);
384 drm_atomic_clean_old_fb(struct drm_device
*dev
, unsigned plane_mask
, int ret
);
386 int __must_check
drm_atomic_check_only(struct drm_atomic_state
*state
);
387 int __must_check
drm_atomic_commit(struct drm_atomic_state
*state
);
388 int __must_check
drm_atomic_nonblocking_commit(struct drm_atomic_state
*state
);
390 void drm_state_dump(struct drm_device
*dev
, struct drm_printer
*p
);
392 #define for_each_connector_in_state(__state, connector, connector_state, __i) \
394 (__i) < (__state)->num_connector && \
395 ((connector) = (__state)->connectors[__i].ptr, \
396 (connector_state) = (__state)->connectors[__i].state, 1); \
398 for_each_if (connector)
400 #define for_each_crtc_in_state(__state, crtc, crtc_state, __i) \
402 (__i) < (__state)->dev->mode_config.num_crtc && \
403 ((crtc) = (__state)->crtcs[__i].ptr, \
404 (crtc_state) = (__state)->crtcs[__i].state, 1); \
406 for_each_if (crtc_state)
408 #define for_each_plane_in_state(__state, plane, plane_state, __i) \
410 (__i) < (__state)->dev->mode_config.num_total_plane && \
411 ((plane) = (__state)->planes[__i].ptr, \
412 (plane_state) = (__state)->planes[__i].state, 1); \
414 for_each_if (plane_state)
417 * drm_atomic_crtc_needs_modeset - compute combined modeset need
418 * @state: &drm_crtc_state for the CRTC
420 * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
421 * whether the state CRTC changed enough to need a full modeset cycle:
422 * connectors_changed, mode_changed and active_changed. This helper simply
423 * combines these three to compute the overall need for a modeset for @state.
425 * The atomic helper code sets these booleans, but drivers can and should
426 * change them appropriately to accurately represent whether a modeset is
427 * really needed. In general, drivers should avoid full modesets whenever
430 * For example if the CRTC mode has changed, and the hardware is able to enact
431 * the requested mode change without going through a full modeset, the driver
432 * should clear mode_changed during its ->atomic_check.
435 drm_atomic_crtc_needs_modeset(const struct drm_crtc_state
*state
)
437 return state
->mode_changed
|| state
->active_changed
||
438 state
->connectors_changed
;
441 #endif /* DRM_ATOMIC_H_ */