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         s32 __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_private_state_funcs - atomic state functions for private objects
 159  *
 160  * These hooks are used by atomic helpers to create, swap and destroy states of
 161  * private objects. The structure itself is used as a vtable to identify the
 162  * associated private object type. Each private object type that needs to be
 163  * added to the atomic states is expected to have an implementation of these
 164  * hooks and pass a pointer to it's drm_private_state_funcs struct to
 165  * drm_atomic_get_private_obj_state().
 166  */
 167 struct drm_private_state_funcs {
 168         /**
 169          * @duplicate_state:
 170          *
 171          * Duplicate the current state of the private object and return it. It
 172          * is an error to call this before obj->state has been initialized.
 173          *
 174          * RETURNS:
 175          *
 176          * Duplicated atomic state or NULL when obj->state is not
 177          * initialized or allocation failed.
 178          */
 179         void *(*duplicate_state)(struct drm_atomic_state *state, void *obj);
 180
 181         /**
 182          * @swap_state:
 183          *
 184          * This function swaps the existing state of a private object @obj with
 185          * it's newly created state, the pointer to which is passed as
 186          * @obj_state_ptr.
 187          */
 188         void (*swap_state)(void *obj, void **obj_state_ptr);
 189
 190         /**
 191          * @destroy_state:
 192          *
 193          * Frees the private object state created with @duplicate_state.
 194          */
 195         void (*destroy_state)(void *obj_state);
 196 };
 197
 198 struct __drm_private_objs_state {
 199         void *obj;
 200         void *obj_state;
 201         const struct drm_private_state_funcs *funcs;
 202 };
 203
 204 /**
 205  * struct drm_atomic_state - the global state object for atomic updates
 206  * @ref: count of all references to this state (will not be freed until zero)
 207  * @dev: parent DRM device
 208  * @allow_modeset: allow full modeset
 209  * @legacy_cursor_update: hint to enforce legacy cursor IOCTL semantics
 210  * @planes: pointer to array of structures with per-plane data
 211  * @crtcs: pointer to array of CRTC pointers
 212  * @num_connector: size of the @connectors and @connector_states arrays
 213  * @connectors: pointer to array of structures with per-connector data
 214  * @num_private_objs: size of the @private_objs array
 215  * @private_objs: pointer to array of private object pointers
 216  * @acquire_ctx: acquire context for this atomic modeset state update
 217  */
 218 struct drm_atomic_state {
 219         struct kref ref;
 220
 221         struct drm_device *dev;
 222         bool allow_modeset : 1;
 223         bool legacy_cursor_update : 1;
 224         struct __drm_planes_state *planes;
 225         struct __drm_crtcs_state *crtcs;
 226         int num_connector;
 227         struct __drm_connnectors_state *connectors;
 228         int num_private_objs;
 229         struct __drm_private_objs_state *private_objs;
 230
 231         struct drm_modeset_acquire_ctx *acquire_ctx;
 232
 233         /**
 234          * @commit_work:
 235          *
 236          * Work item which can be used by the driver or helpers to execute the
 237          * commit without blocking.
 238          */
 239         struct work_struct commit_work;
 240 };
 241
 242 void __drm_crtc_commit_free(struct kref *kref);
 243
 244 /**
 245  * drm_crtc_commit_get - acquire a reference to the CRTC commit
 246  * @commit: CRTC commit
 247  *
 248  * Increases the reference of @commit.
 249  */
 250 static inline void drm_crtc_commit_get(struct drm_crtc_commit *commit)
 251 {
 252         kref_get(&commit->ref);
 253 }
 254
 255 /**
 256  * drm_crtc_commit_put - release a reference to the CRTC commmit
 257  * @commit: CRTC commit
 258  *
 259  * This releases a reference to @commit which is freed after removing the
 260  * final reference. No locking required and callable from any context.
 261  */
 262 static inline void drm_crtc_commit_put(struct drm_crtc_commit *commit)
 263 {
 264         kref_put(&commit->ref, __drm_crtc_commit_free);
 265 }
 266
 267 struct drm_atomic_state * __must_check
 268 drm_atomic_state_alloc(struct drm_device *dev);
 269 void drm_atomic_state_clear(struct drm_atomic_state *state);
 270
 271 /**
 272  * drm_atomic_state_get - acquire a reference to the atomic state
 273  * @state: The atomic state
 274  *
 275  * Returns a new reference to the @state
 276  */
 277 static inline struct drm_atomic_state *
 278 drm_atomic_state_get(struct drm_atomic_state *state)
 279 {
 280         kref_get(&state->ref);
 281         return state;
 282 }
 283
 284 void __drm_atomic_state_free(struct kref *ref);
 285
 286 /**
 287  * drm_atomic_state_put - release a reference to the atomic state
 288  * @state: The atomic state
 289  *
 290  * This releases a reference to @state which is freed after removing the
 291  * final reference. No locking required and callable from any context.
 292  */
 293 static inline void drm_atomic_state_put(struct drm_atomic_state *state)
 294 {
 295         kref_put(&state->ref, __drm_atomic_state_free);
 296 }
 297
 298 int  __must_check
 299 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
 300 void drm_atomic_state_default_clear(struct drm_atomic_state *state);
 301 void drm_atomic_state_default_release(struct drm_atomic_state *state);
 302
 303 struct drm_crtc_state * __must_check
 304 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 305                           struct drm_crtc *crtc);
 306 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 307                 struct drm_crtc_state *state, struct drm_property *property,
 308                 uint64_t val);
 309 struct drm_plane_state * __must_check
 310 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 311                            struct drm_plane *plane);
 312 int drm_atomic_plane_set_property(struct drm_plane *plane,
 313                 struct drm_plane_state *state, struct drm_property *property,
 314                 uint64_t val);
 315 struct drm_connector_state * __must_check
 316 drm_atomic_get_connector_state(struct drm_atomic_state *state,
 317                                struct drm_connector *connector);
 318 int drm_atomic_connector_set_property(struct drm_connector *connector,
 319                 struct drm_connector_state *state, struct drm_property *property,
 320                 uint64_t val);
 321
 322 void * __must_check
 323 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
 324                               void *obj,
 325                               const struct drm_private_state_funcs *funcs);
 326
 327 /**
 328  * drm_atomic_get_existing_crtc_state - get crtc state, if it exists
 329  * @state: global atomic state object
 330  * @crtc: crtc to grab
 331  *
 332  * This function returns the crtc state for the given crtc, or NULL
 333  * if the crtc is not part of the global atomic state.
 334  *
 335  * This function is deprecated, @drm_atomic_get_old_crtc_state or
 336  * @drm_atomic_get_new_crtc_state should be used instead.
 337  */
 338 static inline struct drm_crtc_state *
 339 drm_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
 340                                    struct drm_crtc *crtc)
 341 {
 342         return state->crtcs[drm_crtc_index(crtc)].state;
 343 }
 344
 345 /**
 346  * drm_atomic_get_old_crtc_state - get old crtc state, if it exists
 347  * @state: global atomic state object
 348  * @crtc: crtc to grab
 349  *
 350  * This function returns the old crtc state for the given crtc, or
 351  * NULL if the crtc is not part of the global atomic state.
 352  */
 353 static inline struct drm_crtc_state *
 354 drm_atomic_get_old_crtc_state(struct drm_atomic_state *state,
 355                               struct drm_crtc *crtc)
 356 {
 357         return state->crtcs[drm_crtc_index(crtc)].old_state;
 358 }
 359 /**
 360  * drm_atomic_get_new_crtc_state - get new crtc state, if it exists
 361  * @state: global atomic state object
 362  * @crtc: crtc to grab
 363  *
 364  * This function returns the new crtc state for the given crtc, or
 365  * NULL if the crtc is not part of the global atomic state.
 366  */
 367 static inline struct drm_crtc_state *
 368 drm_atomic_get_new_crtc_state(struct drm_atomic_state *state,
 369                               struct drm_crtc *crtc)
 370 {
 371         return state->crtcs[drm_crtc_index(crtc)].new_state;
 372 }
 373
 374 /**
 375  * drm_atomic_get_existing_plane_state - get plane state, if it exists
 376  * @state: global atomic state object
 377  * @plane: plane to grab
 378  *
 379  * This function returns the plane state for the given plane, or NULL
 380  * if the plane is not part of the global atomic state.
 381  *
 382  * This function is deprecated, @drm_atomic_get_old_plane_state or
 383  * @drm_atomic_get_new_plane_state should be used instead.
 384  */
 385 static inline struct drm_plane_state *
 386 drm_atomic_get_existing_plane_state(struct drm_atomic_state *state,
 387                                     struct drm_plane *plane)
 388 {
 389         return state->planes[drm_plane_index(plane)].state;
 390 }
 391
 392 /**
 393  * drm_atomic_get_old_plane_state - get plane state, if it exists
 394  * @state: global atomic state object
 395  * @plane: plane to grab
 396  *
 397  * This function returns the old plane state for the given plane, or
 398  * NULL if the plane is not part of the global atomic state.
 399  */
 400 static inline struct drm_plane_state *
 401 drm_atomic_get_old_plane_state(struct drm_atomic_state *state,
 402                                struct drm_plane *plane)
 403 {
 404         return state->planes[drm_plane_index(plane)].old_state;
 405 }
 406
 407 /**
 408  * drm_atomic_get_new_plane_state - get plane state, if it exists
 409  * @state: global atomic state object
 410  * @plane: plane to grab
 411  *
 412  * This function returns the new plane state for the given plane, or
 413  * NULL if the plane is not part of the global atomic state.
 414  */
 415 static inline struct drm_plane_state *
 416 drm_atomic_get_new_plane_state(struct drm_atomic_state *state,
 417                                struct drm_plane *plane)
 418 {
 419         return state->planes[drm_plane_index(plane)].new_state;
 420 }
 421
 422 /**
 423  * drm_atomic_get_existing_connector_state - get connector state, if it exists
 424  * @state: global atomic state object
 425  * @connector: connector to grab
 426  *
 427  * This function returns the connector state for the given connector,
 428  * or NULL if the connector is not part of the global atomic state.
 429  *
 430  * This function is deprecated, @drm_atomic_get_old_connector_state or
 431  * @drm_atomic_get_new_connector_state should be used instead.
 432  */
 433 static inline struct drm_connector_state *
 434 drm_atomic_get_existing_connector_state(struct drm_atomic_state *state,
 435                                         struct drm_connector *connector)
 436 {
 437         int index = drm_connector_index(connector);
 438
 439         if (index >= state->num_connector)
 440                 return NULL;
 441
 442         return state->connectors[index].state;
 443 }
 444
 445 /**
 446  * drm_atomic_get_old_connector_state - get connector state, if it exists
 447  * @state: global atomic state object
 448  * @connector: connector to grab
 449  *
 450  * This function returns the old connector state for the given connector,
 451  * or NULL if the connector is not part of the global atomic state.
 452  */
 453 static inline struct drm_connector_state *
 454 drm_atomic_get_old_connector_state(struct drm_atomic_state *state,
 455                                    struct drm_connector *connector)
 456 {
 457         int index = drm_connector_index(connector);
 458
 459         if (index >= state->num_connector)
 460                 return NULL;
 461
 462         return state->connectors[index].old_state;
 463 }
 464
 465 /**
 466  * drm_atomic_get_new_connector_state - get connector state, if it exists
 467  * @state: global atomic state object
 468  * @connector: connector to grab
 469  *
 470  * This function returns the new connector state for the given connector,
 471  * or NULL if the connector is not part of the global atomic state.
 472  */
 473 static inline struct drm_connector_state *
 474 drm_atomic_get_new_connector_state(struct drm_atomic_state *state,
 475                                    struct drm_connector *connector)
 476 {
 477         int index = drm_connector_index(connector);
 478
 479         if (index >= state->num_connector)
 480                 return NULL;
 481
 482         return state->connectors[index].new_state;
 483 }
 484
 485 /**
 486  * __drm_atomic_get_current_plane_state - get current plane state
 487  * @state: global atomic state object
 488  * @plane: plane to grab
 489  *
 490  * This function returns the plane state for the given plane, either from
 491  * @state, or if the plane isn't part of the atomic state update, from @plane.
 492  * This is useful in atomic check callbacks, when drivers need to peek at, but
 493  * not change, state of other planes, since it avoids threading an error code
 494  * back up the call chain.
 495  *
 496  * WARNING:
 497  *
 498  * Note that this function is in general unsafe since it doesn't check for the
 499  * required locking for access state structures. Drivers must ensure that it is
 500  * safe to access the returned state structure through other means. One common
 501  * example is when planes are fixed to a single CRTC, and the driver knows that
 502  * the CRTC lock is held already. In that case holding the CRTC lock gives a
 503  * read-lock on all planes connected to that CRTC. But if planes can be
 504  * reassigned things get more tricky. In that case it's better to use
 505  * drm_atomic_get_plane_state and wire up full error handling.
 506  *
 507  * Returns:
 508  *
 509  * Read-only pointer to the current plane state.
 510  */
 511 static inline const struct drm_plane_state *
 512 __drm_atomic_get_current_plane_state(struct drm_atomic_state *state,
 513                                      struct drm_plane *plane)
 514 {
 515         if (state->planes[drm_plane_index(plane)].state)
 516                 return state->planes[drm_plane_index(plane)].state;
 517
 518         return plane->state;
 519 }
 520
 521 int __must_check
 522 drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
 523                              const struct drm_display_mode *mode);
 524 int __must_check
 525 drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 526                                   struct drm_property_blob *blob);
 527 int __must_check
 528 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 529                               struct drm_crtc *crtc);
 530 void drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
 531                                  struct drm_framebuffer *fb);
 532 void drm_atomic_set_fence_for_plane(struct drm_plane_state *plane_state,
 533                                     struct dma_fence *fence);
 534 int __must_check
 535 drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 536                                   struct drm_crtc *crtc);
 537 int __must_check
 538 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
 539                                    struct drm_crtc *crtc);
 540 int __must_check
 541 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
 542                                struct drm_crtc *crtc);
 543
 544 void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
 545
 546 void
 547 drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
 548
 549 int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
 550 int __must_check drm_atomic_commit(struct drm_atomic_state *state);
 551 int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
 552
 553 void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 554
 555 /**
 556  * for_each_connector_in_state - iterate over all connectors in an atomic update
 557  * @__state: &struct drm_atomic_state pointer
 558  * @connector: &struct drm_connector iteration cursor
 559  * @connector_state: &struct drm_connector_state iteration cursor
 560  * @__i: int iteration cursor, for macro-internal use
 561  *
 562  * This iterates over all connectors in an atomic update. Note that before the
 563  * software state is committed (by calling drm_atomic_helper_swap_state(), this
 564  * points to the new state, while afterwards it points to the old state. Due to
 565  * this tricky confusion this macro is deprecated.
 566  *
 567  * FIXME:
 568  *
 569  * Replace all usage of this with one of the explicit iterators below and then
 570  * remove this macro.
 571  */
 572 #define for_each_connector_in_state(__state, connector, connector_state, __i) \
 573         for ((__i) = 0;                                                 \
 574              (__i) < (__state)->num_connector &&                                \
 575              ((connector) = (__state)->connectors[__i].ptr,                     \
 576              (connector_state) = (__state)->connectors[__i].state, 1);  \
 577              (__i)++)                                                   \
 578                 for_each_if (connector)
 579
 580 /**
 581  * for_each_oldnew_connector_in_state - iterate over all connectors in an atomic update
 582  * @__state: &struct drm_atomic_state pointer
 583  * @connector: &struct drm_connector iteration cursor
 584  * @old_connector_state: &struct drm_connector_state iteration cursor for the
 585  *      old state
 586  * @new_connector_state: &struct drm_connector_state iteration cursor for the
 587  *      new state
 588  * @__i: int iteration cursor, for macro-internal use
 589  *
 590  * This iterates over all connectors in an atomic update, tracking both old and
 591  * new state. This is useful in places where the state delta needs to be
 592  * considered, for example in atomic check functions.
 593  */
 594 #define for_each_oldnew_connector_in_state(__state, connector, old_connector_state, new_connector_state, __i) \
 595         for ((__i) = 0;                                                         \
 596              (__i) < (__state)->num_connector &&                                \
 597              ((connector) = (__state)->connectors[__i].ptr,                     \
 598              (old_connector_state) = (__state)->connectors[__i].old_state,      \
 599              (new_connector_state) = (__state)->connectors[__i].new_state, 1);  \
 600              (__i)++)                                                   \
 601                 for_each_if (connector)
 602
 603 /**
 604  * for_each_old_connector_in_state - iterate over all connectors in an atomic update
 605  * @__state: &struct drm_atomic_state pointer
 606  * @connector: &struct drm_connector iteration cursor
 607  * @old_connector_state: &struct drm_connector_state iteration cursor for the
 608  *      old state
 609  * @__i: int iteration cursor, for macro-internal use
 610  *
 611  * This iterates over all connectors in an atomic update, tracking only the old
 612  * state. This is useful in disable functions, where we need the old state the
 613  * hardware is still in.
 614  */
 615 #define for_each_old_connector_in_state(__state, connector, old_connector_state, __i) \
 616         for ((__i) = 0;                                                         \
 617              (__i) < (__state)->num_connector &&                                \
 618              ((connector) = (__state)->connectors[__i].ptr,                     \
 619              (old_connector_state) = (__state)->connectors[__i].old_state, 1);  \
 620              (__i)++)                                                   \
 621                 for_each_if (connector)
 622
 623 /**
 624  * for_each_new_connector_in_state - iterate over all connectors in an atomic update
 625  * @__state: &struct drm_atomic_state pointer
 626  * @connector: &struct drm_connector iteration cursor
 627  * @new_connector_state: &struct drm_connector_state iteration cursor for the
 628  *      new state
 629  * @__i: int iteration cursor, for macro-internal use
 630  *
 631  * This iterates over all connectors in an atomic update, tracking only the new
 632  * state. This is useful in enable functions, where we need the new state the
 633  * hardware should be in when the atomic commit operation has completed.
 634  */
 635 #define for_each_new_connector_in_state(__state, connector, new_connector_state, __i) \
 636         for ((__i) = 0;                                                         \
 637              (__i) < (__state)->num_connector &&                                \
 638              ((connector) = (__state)->connectors[__i].ptr,                     \
 639              (new_connector_state) = (__state)->connectors[__i].new_state, 1);  \
 640              (__i)++)                                                   \
 641                 for_each_if (connector)
 642
 643 /**
 644  * for_each_crtc_in_state - iterate over all connectors in an atomic update
 645  * @__state: &struct drm_atomic_state pointer
 646  * @crtc: &struct drm_crtc iteration cursor
 647  * @crtc_state: &struct drm_crtc_state iteration cursor
 648  * @__i: int iteration cursor, for macro-internal use
 649  *
 650  * This iterates over all CRTCs in an atomic update. Note that before the
 651  * software state is committed (by calling drm_atomic_helper_swap_state(), this
 652  * points to the new state, while afterwards it points to the old state. Due to
 653  * this tricky confusion this macro is deprecated.
 654  *
 655  * FIXME:
 656  *
 657  * Replace all usage of this with one of the explicit iterators below and then
 658  * remove this macro.
 659  */
 660 #define for_each_crtc_in_state(__state, crtc, crtc_state, __i)  \
 661         for ((__i) = 0;                                         \
 662              (__i) < (__state)->dev->mode_config.num_crtc &&    \
 663              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 664              (crtc_state) = (__state)->crtcs[__i].state, 1);    \
 665              (__i)++)                                           \
 666                 for_each_if (crtc_state)
 667
 668 /**
 669  * for_each_oldnew_crtc_in_state - iterate over all CRTCs in an atomic update
 670  * @__state: &struct drm_atomic_state pointer
 671  * @crtc: &struct drm_crtc iteration cursor
 672  * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
 673  * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
 674  * @__i: int iteration cursor, for macro-internal use
 675  *
 676  * This iterates over all CRTCs in an atomic update, tracking both old and
 677  * new state. This is useful in places where the state delta needs to be
 678  * considered, for example in atomic check functions.
 679  */
 680 #define for_each_oldnew_crtc_in_state(__state, crtc, old_crtc_state, new_crtc_state, __i) \
 681         for ((__i) = 0;                                                 \
 682              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 683              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 684              (old_crtc_state) = (__state)->crtcs[__i].old_state,        \
 685              (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);    \
 686              (__i)++)                                                   \
 687                 for_each_if (crtc)
 688
 689 /**
 690  * for_each_old_crtc_in_state - iterate over all CRTCs in an atomic update
 691  * @__state: &struct drm_atomic_state pointer
 692  * @crtc: &struct drm_crtc iteration cursor
 693  * @old_crtc_state: &struct drm_crtc_state iteration cursor for the old state
 694  * @__i: int iteration cursor, for macro-internal use
 695  *
 696  * This iterates over all CRTCs in an atomic update, tracking only the old
 697  * state. This is useful in disable functions, where we need the old state the
 698  * hardware is still in.
 699  */
 700 #define for_each_old_crtc_in_state(__state, crtc, old_crtc_state, __i)  \
 701         for ((__i) = 0;                                                 \
 702              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 703              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 704              (old_crtc_state) = (__state)->crtcs[__i].old_state, 1);    \
 705              (__i)++)                                                   \
 706                 for_each_if (crtc)
 707
 708 /**
 709  * for_each_new_crtc_in_state - iterate over all CRTCs in an atomic update
 710  * @__state: &struct drm_atomic_state pointer
 711  * @crtc: &struct drm_crtc iteration cursor
 712  * @new_crtc_state: &struct drm_crtc_state iteration cursor for the new state
 713  * @__i: int iteration cursor, for macro-internal use
 714  *
 715  * This iterates over all CRTCs in an atomic update, tracking only the new
 716  * state. This is useful in enable functions, where we need the new state the
 717  * hardware should be in when the atomic commit operation has completed.
 718  */
 719 #define for_each_new_crtc_in_state(__state, crtc, new_crtc_state, __i)  \
 720         for ((__i) = 0;                                                 \
 721              (__i) < (__state)->dev->mode_config.num_crtc &&            \
 722              ((crtc) = (__state)->crtcs[__i].ptr,                       \
 723              (new_crtc_state) = (__state)->crtcs[__i].new_state, 1);    \
 724              (__i)++)                                                   \
 725                 for_each_if (crtc)
 726
 727 /**
 728  * for_each_plane_in_state - iterate over all planes in an atomic update
 729  * @__state: &struct drm_atomic_state pointer
 730  * @plane: &struct drm_plane iteration cursor
 731  * @plane_state: &struct drm_plane_state iteration cursor
 732  * @__i: int iteration cursor, for macro-internal use
 733  *
 734  * This iterates over all planes in an atomic update. Note that before the
 735  * software state is committed (by calling drm_atomic_helper_swap_state(), this
 736  * points to the new state, while afterwards it points to the old state. Due to
 737  * this tricky confusion this macro is deprecated.
 738  *
 739  * FIXME:
 740  *
 741  * Replace all usage of this with one of the explicit iterators below and then
 742  * remove this macro.
 743  */
 744 #define for_each_plane_in_state(__state, plane, plane_state, __i)               \
 745         for ((__i) = 0;                                                 \
 746              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 747              ((plane) = (__state)->planes[__i].ptr,                             \
 748              (plane_state) = (__state)->planes[__i].state, 1);          \
 749              (__i)++)                                                   \
 750                 for_each_if (plane_state)
 751
 752 /**
 753  * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
 754  * @__state: &struct drm_atomic_state pointer
 755  * @plane: &struct drm_plane iteration cursor
 756  * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
 757  * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
 758  * @__i: int iteration cursor, for macro-internal use
 759  *
 760  * This iterates over all planes in an atomic update, tracking both old and
 761  * new state. This is useful in places where the state delta needs to be
 762  * considered, for example in atomic check functions.
 763  */
 764 #define for_each_oldnew_plane_in_state(__state, plane, old_plane_state, new_plane_state, __i) \
 765         for ((__i) = 0;                                                 \
 766              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 767              ((plane) = (__state)->planes[__i].ptr,                     \
 768              (old_plane_state) = (__state)->planes[__i].old_state,      \
 769              (new_plane_state) = (__state)->planes[__i].new_state, 1);  \
 770              (__i)++)                                                   \
 771                 for_each_if (plane)
 772
 773 /**
 774  * for_each_old_plane_in_state - iterate over all planes in an atomic update
 775  * @__state: &struct drm_atomic_state pointer
 776  * @plane: &struct drm_plane iteration cursor
 777  * @old_plane_state: &struct drm_plane_state iteration cursor for the old state
 778  * @__i: int iteration cursor, for macro-internal use
 779  *
 780  * This iterates over all planes in an atomic update, tracking only the old
 781  * state. This is useful in disable functions, where we need the old state the
 782  * hardware is still in.
 783  */
 784 #define for_each_old_plane_in_state(__state, plane, old_plane_state, __i) \
 785         for ((__i) = 0;                                                 \
 786              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 787              ((plane) = (__state)->planes[__i].ptr,                     \
 788              (old_plane_state) = (__state)->planes[__i].old_state, 1);  \
 789              (__i)++)                                                   \
 790                 for_each_if (plane)
 791
 792 /**
 793  * for_each_new_plane_in_state - iterate over all planes in an atomic update
 794  * @__state: &struct drm_atomic_state pointer
 795  * @plane: &struct drm_plane iteration cursor
 796  * @new_plane_state: &struct drm_plane_state iteration cursor for the new state
 797  * @__i: int iteration cursor, for macro-internal use
 798  *
 799  * This iterates over all planes in an atomic update, tracking only the new
 800  * state. This is useful in enable functions, where we need the new state the
 801  * hardware should be in when the atomic commit operation has completed.
 802  */
 803 #define for_each_new_plane_in_state(__state, plane, new_plane_state, __i) \
 804         for ((__i) = 0;                                                 \
 805              (__i) < (__state)->dev->mode_config.num_total_plane &&     \
 806              ((plane) = (__state)->planes[__i].ptr,                     \
 807              (new_plane_state) = (__state)->planes[__i].new_state, 1);  \
 808              (__i)++)                                                   \
 809                 for_each_if (plane)
 810
 811 /**
 812  * __for_each_private_obj - iterate over all private objects
 813  * @__state: &struct drm_atomic_state pointer
 814  * @obj: private object iteration cursor
 815  * @obj_state: private object state iteration cursor
 816  * @__i: int iteration cursor, for macro-internal use
 817  * @__funcs: &struct drm_private_state_funcs iteration cursor
 818  *
 819  * This macro iterates over the array containing private object data in atomic
 820  * state
 821  */
 822 #define __for_each_private_obj(__state, obj, obj_state, __i, __funcs)   \
 823         for ((__i) = 0;                                                 \
 824              (__i) < (__state)->num_private_objs &&                     \
 825              ((obj) = (__state)->private_objs[__i].obj,                 \
 826               (__funcs) = (__state)->private_objs[__i].funcs,           \
 827               (obj_state) = (__state)->private_objs[__i].obj_state,     \
 828               1);                                                       \
 829              (__i)++)                                                   \
 830
 831 /**
 832  * for_each_private_obj - iterate over a specify type of private object
 833  * @__state: &struct drm_atomic_state pointer
 834  * @obj_funcs: &struct drm_private_state_funcs function table to filter
 835  *      private objects
 836  * @obj: private object iteration cursor
 837  * @obj_state: private object state iteration cursor
 838  * @__i: int iteration cursor, for macro-internal use
 839  * @__funcs: &struct drm_private_state_funcs iteration cursor
 840  *
 841  * This macro iterates over the private objects state array while filtering the
 842  * objects based on the vfunc table that is passed as @obj_funcs. New macros
 843  * can be created by passing in the vfunc table associated with a specific
 844  * private object.
 845  */
 846 #define for_each_private_obj(__state, obj_funcs, obj, obj_state, __i, __funcs)  \
 847         __for_each_private_obj(__state, obj, obj_state, __i, __funcs)           \
 848                 for_each_if (__funcs == obj_funcs)
 849
 850 /**
 851  * drm_atomic_crtc_needs_modeset - compute combined modeset need
 852  * @state: &drm_crtc_state for the CRTC
 853  *
 854  * To give drivers flexibility &struct drm_crtc_state has 3 booleans to track
 855  * whether the state CRTC changed enough to need a full modeset cycle:
 856  * planes_changed, mode_changed and active_changed. This helper simply
 857  * combines these three to compute the overall need for a modeset for @state.
 858  *
 859  * The atomic helper code sets these booleans, but drivers can and should
 860  * change them appropriately to accurately represent whether a modeset is
 861  * really needed. In general, drivers should avoid full modesets whenever
 862  * possible.
 863  *
 864  * For example if the CRTC mode has changed, and the hardware is able to enact
 865  * the requested mode change without going through a full modeset, the driver
 866  * should clear mode_changed in its &drm_mode_config_funcs.atomic_check
 867  * implementation.
 868  */
 869 static inline bool
 870 drm_atomic_crtc_needs_modeset(const struct drm_crtc_state *state)
 871 {
 872         return state->mode_changed || state->active_changed ||
 873                state->connectors_changed;
 874 }
 875
 876 #endif /* DRM_ATOMIC_H_ */