include/drm/drm_atomic.h

   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
  33 /**
  34  * struct drm_crtc_commit - track modeset commits on a CRTC
  35  *
  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.
  40  *
  41  * It has 3 different events in total to allow a fine-grained synchronization
  42  * between outstanding updates::
  43  *
  44  *      atomic commit thread                    hardware
  45  *
  46  *      write new state into hardware   ---->   ...
  47  *      signal hw_done
  48  *                                              switch to new state on next
  49  *      ...                                     v/hblank
  50  *
  51  *      wait for buffers to show up             ...
  52  *
  53  *      ...                                     send completion irq
  54  *                                              irq handler signals flip_done
  55  *      cleanup old buffers
  56  *
  57  *      signal cleanup_done
  58  *
  59  *      wait for flip_done              <----
  60  *      clean up atomic state
  61  *
  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.
  65  *
  66  * For an implementation of how to use this look at
  67  * drm_atomic_helper_setup_commit() from the atomic helper library.
  68  */
  69 struct drm_crtc_commit {
  70         /**
  71          * @crtc:
  72          *
  73          * DRM CRTC for this commit.
  74          */
  75         struct drm_crtc *crtc;
  76
  77         /**
  78          * @ref:
  79          *
  80          * Reference count for this structure. Needed to allow blocking on
  81          * completions without the risk of the completion disappearing
  82          * meanwhile.
  83          */
  84         struct kref ref;
  85
  86         /**
  87          * @flip_done:
  88          *
  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
  93          * signalled.
  94          */
  95         struct completion flip_done;
  96
  97         /**
  98          * @hw_done:
  99          *
 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
 104          * I/O is required.
 105          *
 106          * Note that this does not need to include separately reference-counted
 107          * resources like backing storage buffer pinning, or runtime pm
 108          * management.
 109          */
 110         struct completion hw_done;
 111
 112         /**
 113          * @cleanup_done:
 114          *
 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.
 120          */
 121         struct completion cleanup_done;
 122
 123         /**
 124          * @commit_entry:
 125          *
 126          * Entry on the per-CRTC &drm_crtc.commit_list. Protected by
 127          * $drm_crtc.commit_lock.
 128          */
 129         struct list_head commit_entry;
 130
 131         /**
 132          * @event:
 133          *
 134          * &drm_pending_vblank_event pointer to clean up private events.
 135          */
 136         struct drm_pending_vblank_event *event;
 137 };
 138
 139 struct __drm_planes_state {
 140         struct drm_plane *ptr;
 141         struct drm_plane_state *state, *old_state, *new_state;
 142 };
 143
 144 struct __drm_crtcs_state {
 145         struct drm_crtc *ptr;
 146         struct drm_crtc_state *state, *old_state, *new_state;
 147         struct drm_crtc_commit *commit;
 148         s64 __user *out_fence_ptr;
 149         unsigned last_vblank_count;
 150 };
 151
 152 struct __drm_connnectors_state {
 153         struct drm_connector *ptr;
 154         struct drm_connector_state *state, *old_state, *new_state;
 155 };
 156
 157 /**
 158  * struct drm_atomic_state - the global state object for atomic updates
 159  * @ref: count of all references to this state (will not be freed until zero)
 160  * @dev: parent DRM device
 161  * @allow_modeset: allow full modeset
 162  * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
 163  * @legacy_set_config: Disable conflicting encoders instead of failing with -EINVAL.
 164  * @planes: pointer to array of structures with per-plane data
 165  * @crtcs: pointer to array of CRTC pointers
 166  * @num_connector: size of the @connectors and @connector_states arrays
 167  * @connectors: pointer to array of structures with per-connector data
 168  * @acquire_ctx: acquire context for this atomic modeset state update
 169  */
 170 struct drm_atomic_state {
 171         struct kref ref;
 172
 173         struct drm_device *dev;
 174         bool allow_modeset : 1;
 175         bool legacy_cursor_update : 1;
 176         bool legacy_set_config : 1;
 177         struct __drm_planes_state *planes;
 178         struct __drm_crtcs_state *crtcs;
 179         int num_connector;
 180         struct __drm_connnectors_state *connectors;
 181
 182         struct drm_modeset_acquire_ctx *acquire_ctx;
 183
 184         /**
 185          * @commit_work:
 186          *
 187          * Work item which can be used by the driver or helpers to execute the
 188          * commit without blocking.
 189          */
 190         struct work_struct commit_work;
 191 };
 192
 193 void __drm_crtc_commit_free(struct kref *kref);
 194
 195 /**
 196  * drm_crtc_commit_get - acquire a reference to the CRTC commit
 197  * @commit: CRTC commit
 198  *
 199  * Increases the reference of @commit.
 200  */
 201 static inline void drm_crtc_commit_get(struct drm_crtc_commit *commit)
 202 {
 203         kref_get(&commit->ref);
 204 }
 205
 206 /**
 207  * drm_crtc_commit_put - release a reference to the CRTC commmit
 208  * @commit: CRTC commit
 209  *
 210  * This releases a reference to @commit which is freed after removing the
 211  * final reference. No locking required and callable from any context.
 212  */
 213 static inline void drm_crtc_commit_put(struct drm_crtc_commit *commit)
 214 {
 215         kref_put(&commit->ref, __drm_crtc_commit_free);
 216 }
 217
 218 struct drm_atomic_state * __must_check
 219 drm_atomic_state_alloc(struct drm_device *dev);
 220 void drm_atomic_state_clear(struct drm_atomic_state *state);
 221
 222 /**
 223  * drm_atomic_state_get - acquire a reference to the atomic state
 224  * @state: The atomic state
 225  *
 226  * Returns a new reference to the @state
 227  */
 228 static inline struct drm_atomic_state *
 229 drm_atomic_state_get(struct drm_atomic_state *state)
 230 {
 231         kref_get(&state->ref);
 232         return state;
 233 }
 234
 235 void __drm_atomic_state_free(struct kref *ref);
 236
 237 /**
 238  * drm_atomic_state_put - release a reference to the atomic state
 239  * @state: The atomic state
 240  *
 241  * This releases a reference to @state which is freed after removing the
 242  * final reference. No locking required and callable from any context.
 243  */
 244 static inline void drm_atomic_state_put(struct drm_atomic_state *state)
 245 {
 246         kref_put(&state->ref, __drm_atomic_state_free);
 247 }
 248
 249 int  __must_check
 250 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
 251 void drm_atomic_state_default_clear(struct drm_atomic_state *state);
 252 void drm_atomic_state_default_release(struct drm_atomic_state *state);
 253
 254 struct drm_crtc_state * __must_check
 255 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 256                           struct drm_crtc *crtc);
 257 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 258                 struct drm_crtc_state *state, struct drm_property *property,
 259                 uint64_t val);
 260 struct drm_plane_state * __must_check
 261 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 262                            struct drm_plane *plane);
 263 int drm_atomic_plane_set_property(struct drm_plane *plane,
 264                 struct drm_plane_state *state, struct drm_property *property,
 265                 uint64_t val);
 266 struct drm_connector_state * __must_check
 267 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 268                                struct drm_connector *connector);
 269 int drm_atomic_connector_set_property(struct drm_connector *connector,
 270                 struct drm_connector_state *state, struct drm_property *property,
 271                 uint64_t val);
 272
 273 /**
 274  * drm_atomic_get_existing_crtc_state - get crtc state, if it exists
 275  * @state: global atomic state object
 276  * @crtc: crtc to grab
 277  *
 278  * This function returns the crtc state for the given crtc, or NULL
 279  * if the crtc is not part of the global atomic state.
 280  */
 281 static inline struct drm_crtc_state *
 282 drm_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
 283                                    struct drm_crtc *crtc)
 284 {
 285         return state->crtcs[drm_crtc_index(crtc)].state;
 286 }
 287
 288 /**
 289  * drm_atomic_get_existing_plane_state - get plane state, if it exists
 290  * @state: global atomic state object
 291  * @plane: plane to grab
 292  *
 293  * This function returns the plane state for the given plane, or NULL
 294  * if the plane is not part of the global atomic state.
 295  */
 296 static inline struct drm_plane_state *
 297 drm_atomic_get_existing_plane_state(struct drm_atomic_state *state,
 298                                     struct drm_plane *plane)
 299 {
 300         return state->planes[drm_plane_index(plane)].state;
 301 }
 302
 303 /**
 304  * drm_atomic_get_existing_connector_state - get connector state, if it exists
 305  * @state: global atomic state object
 306  * @connector: connector to grab
 307  *
 308  * This function returns the connector state for the given connector,
 309  * or NULL if the connector is not part of the global atomic state.
 310  */
 311 static inline struct drm_connector_state *
 312 drm_atomic_get_existing_connector_state(struct drm_atomic_state *state,
 313                                         struct drm_connector *connector)
 314 {
 315         int index = drm_connector_index(connector);
 316
 317         if (index >= state->num_connector)
 318                 return NULL;
 319
 320         return state->connectors[index].state;
 321 }
 322
 323 /**
 324  * __drm_atomic_get_current_plane_state - get current plane state
 325  * @state: global atomic state object
 326  * @plane: plane to grab
 327  *
 328  * This function returns the plane state for the given plane, either from
 329  * @state, or if the plane isn't part of the atomic state update, from @plane.
 330  * This is useful in atomic check callbacks, when drivers need to peek at, but
 331  * not change, state of other planes, since it avoids threading an error code
 332  * back up the call chain.
 333  *
 334  * WARNING:
 335  *
 336  * Note that this function is in general unsafe since it doesn't check for the
 337  * required locking for access state structures. Drivers must ensure that it is
 338  * safe to access the returned state structure through other means. One common
 339  * example is when planes are fixed to a single CRTC, and the driver knows that
 340  * the CRTC lock is held already. In that case holding the CRTC lock gives a
 341  * read-lock on all planes connected to that CRTC. But if planes can be
 342  * reassigned things get more tricky. In that case it's better to use
 343  * drm_atomic_get_plane_state and wire up full error handling.
 344  *
 345  * Returns:
 346  *
 347  * Read-only pointer to the current plane state.
 348  */
 349 static inline const struct drm_plane_state *
 350 __drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
 351                                      struct drm_plane *plane)
 352 {
 353         if (state->planes[drm_plane_index(plane)].state)
 354                 return state->planes[drm_plane_index(plane)].state;
 355
 356         return plane->state;
 357 }
 358
 359 int __must_check
 360 drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
 361                              struct drm_display_mode *mode);
 362 int __must_check
 363 drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 364                                   struct drm_property_blob *blob);
 365 int __must_check
 366 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 367                               struct drm_crtc *crtc);
 368 void drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 369                                  struct drm_framebuffer *fb);
 370 void drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 371                                     struct dma_fence *fence);
 372 int __must_check
 373 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 374                                   struct drm_crtc *crtc);
 375 int __must_check
 376 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 377                                    struct drm_crtc *crtc);
 378 int __must_check
 379 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
 380                                struct drm_crtc *crtc);
 381
 382 void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
 383
 384 void
 385 drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
 386
 387 int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
 388 int __must_check drm_atomic_commit(struct drm_atomic_state *state);
 389 int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
 390
 391 void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 392
 393 #define for_each_connector_in_state(__state, connector, connector_state, __i) \
 394         for ((__i) = 0;                                                 \
 395              (__i) < (__state)->num_connector &&                                \
 396              ((connector) = (__state)->connectors[__i].ptr,                     \
 397              (connector_state) = (__state)->connectors[__i].state, 1);  \
 398              (__i)++)                                                   \
 399                 for_each_if (connector)
 400
 401 #define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
 402         for ((__i) = 0;                                                         \
 403              (__i) < (__state)->num_connector &&                                \
 404              ((connector) = (__state)->connectors[__i].ptr,                     \
 405              (old_connector_state) = (__state)->connectors[__i].old_state,      \
 406              (new_connector_state) = (__state)->connectors[__i].new_state, 1);  \
 407              (__i)++)                                                   \
 408                 for_each_if (connector)
 409
 410 #define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
 411         for ((__i) = 0;                                                         \
 412              (__i) < (__state)->num_connector &&                                \
 413              ((connector) = (__state)->connectors[__i].ptr,                     \
 414              (old_connector_state) = (__state)->connectors[__i].old_state, 1);  \
 415              (__i)++)                                                   \
 416                 for_each_if (connector)
 417
 418 #define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
 419         for ((__i) = 0;                                                         \
 420              (__i) < (__state)->num_connector &&                                \
 421              ((connector) = (__state)->connectors[__i].ptr,                     \
 422              (new_connector_state) = (__state)->connectors[__i].new_state, 1);  \
 423              (__i)++)                                                   \
 424                 for_each_if (connector)
 425
 426 #define for_each_crtc_in_state(__state, crtc, crtc_state, __i)  \
 427         for ((__i) = 0;                                         \
 428              (__i) < (__state)->dev->mode_config.num_crtc &&    \
 429              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 430              (crtc_state) = (__state)->crtcs[__i].state, 1);    \
 431              (__i)++)                                           \
 432                 for_each_if (crtc_state)
 433
 434 #define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
 435         for ((__i) = 0;                                                 \
 436              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 437              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 438              (old_crtc_state) = (__state)->crtcs[__i].old_state,        \
 439              (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);    \
 440              (__i)++)                                                   \
 441                 for_each_if (crtc)
 442
 443 #define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i)  \
 444         for ((__i) = 0;                                                 \
 445              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 446              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 447              (old_crtc_state) = (__state)->crtcs[__i].old_state, 1);    \
 448              (__i)++)                                                   \
 449                 for_each_if (crtc)
 450
 451 #define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i)  \
 452         for ((__i) = 0;                                                 \
 453              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 454              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 455              (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);    \
 456              (__i)++)                                                   \
 457                 for_each_if (crtc)
 458
 459 #define for_each_plane_in_state(__state, plane, plane_state, __i)               \
 460         for ((__i) = 0;                                                 \
 461              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 462              ((plane) = (__state)->planes[__i].ptr,                             \
 463              (plane_state) = (__state)->planes[__i].state, 1);          \
 464              (__i)++)                                                   \
 465                 for_each_if (plane_state)
 466
 467 #define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
 468         for ((__i) = 0;                                                 \
 469              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 470              ((plane) = (__state)->planes[__i].ptr,                     \
 471              (old_plane_state) = (__state)->planes[__i].old_state,      \
 472              (new_plane_state) = (__state)->planes[__i].new_state, 1);  \
 473              (__i)++)                                                   \
 474                 for_each_if (plane)
 475
 476 #define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
 477         for ((__i) = 0;                                                 \
 478              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 479              ((plane) = (__state)->planes[__i].ptr,                     \
 480              (old_plane_state) = (__state)->planes[__i].old_state, 1);  \
 481              (__i)++)                                                   \
 482                 for_each_if (plane)
 483
 484 #define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
 485         for ((__i) = 0;                                                 \
 486              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 487              ((plane) = (__state)->planes[__i].ptr,                     \
 488              (new_plane_state) = (__state)->planes[__i].new_state, 1);  \
 489              (__i)++)                                                   \
 490                 for_each_if (plane)
 491
 492 /**
 493  * drm_atomic_crtc_needs_modeset - compute combined modeset need
 494  * @state: &drm_crtc_state for the CRTC
 495  *
 496  * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
 497  * whether the state CRTC changed enough to need a full modeset cycle:
 498  * connectors_changed, mode_changed and active_changed. This helper simply
 499  * combines these three to compute the overall need for a modeset for @state.
 500  *
 501  * The atomic helper code sets these booleans, but drivers can and should
 502  * change them appropriately to accurately represent whether a modeset is
 503  * really needed. In general, drivers should avoid full modesets whenever
 504  * possible.
 505  *
 506  * For example if the CRTC mode has changed, and the hardware is able to enact
 507  * the requested mode change without going through a full modeset, the driver
 508  * should clear mode_changed in its &drm_mode_config_funcs.atomic_check
 509  * implementation.
 510  */
 511 static inline bool
 512 drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
 513 {
 514         return state->mode_changed || state->active_changed ||
 515                state->connectors_changed;
 516 }
 517
 518 #endif /* DRM_ATOMIC_H_ */