drivers/gpu/drm/drm_damage_helper.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2018 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  * Deepak Rawat <drawat@vmware.com>
  29  * Rob Clark <robdclark@gmail.com>
  30  *
  31  **************************************************************************/
  32
  33 #include <drm/drm_atomic.h>
  34 #include <drm/drm_damage_helper.h>
  35 #include <drm/drm_device.h>
  36 #include <drm/drm_framebuffer.h>
  37
  38 static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
  39                                       struct drm_mode_rect *dest,
  40                                       uint32_t num_clips, uint32_t src_inc)
  41 {
  42         while (num_clips > 0) {
  43                 dest->x1 = src->x1;
  44                 dest->y1 = src->y1;
  45                 dest->x2 = src->x2;
  46                 dest->y2 = src->y2;
  47                 src += src_inc;
  48                 dest++;
  49                 num_clips--;
  50         }
  51 }
  52
  53 /**
  54  * drm_atomic_helper_check_plane_damage - Verify plane damage on atomic_check.
  55  * @state: The driver state object.
  56  * @plane_state: Plane state for which to verify damage.
  57  *
  58  * This helper function makes sure that damage from plane state is discarded
  59  * for full modeset. If there are more reasons a driver would want to do a full
  60  * plane update rather than processing individual damage regions, then those
  61  * cases should be taken care of here.
  62  *
  63  * Note that &drm_plane_state.fb_damage_clips == NULL in plane state means that
  64  * full plane update should happen. It also ensure helper iterator will return
  65  * &drm_plane_state.src as damage.
  66  */
  67 void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state,
  68                                           struct drm_plane_state *plane_state)
  69 {
  70         struct drm_crtc_state *crtc_state;
  71
  72         if (plane_state->crtc) {
  73                 crtc_state = drm_atomic_get_new_crtc_state(state,
  74                                                            plane_state->crtc);
  75
  76                 if (WARN_ON(!crtc_state))
  77                         return;
  78
  79                 if (drm_atomic_crtc_needs_modeset(crtc_state)) {
  80                         drm_property_blob_put(plane_state->fb_damage_clips);
  81                         plane_state->fb_damage_clips = NULL;
  82                 }
  83         }
  84 }
  85 EXPORT_SYMBOL(drm_atomic_helper_check_plane_damage);
  86
  87 /**
  88  * drm_atomic_helper_dirtyfb - Helper for dirtyfb.
  89  * @fb: DRM framebuffer.
  90  * @file_priv: Drm file for the ioctl call.
  91  * @flags: Dirty fb annotate flags.
  92  * @color: Color for annotate fill.
  93  * @clips: Dirty region.
  94  * @num_clips: Count of clip in clips.
  95  *
  96  * A helper to implement &drm_framebuffer_funcs.dirty using damage interface
  97  * during plane update. If num_clips is 0 then this helper will do a full plane
  98  * update. This is the same behaviour expected by DIRTFB IOCTL.
  99  *
 100  * Note that this helper is blocking implementation. This is what current
 101  * drivers and userspace expect in their DIRTYFB IOCTL implementation, as a way
 102  * to rate-limit userspace and make sure its rendering doesn't get ahead of
 103  * uploading new data too much.
 104  *
 105  * Return: Zero on success, negative errno on failure.
 106  */
 107 int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,
 108                               struct drm_file *file_priv, unsigned int flags,
 109                               unsigned int color, struct drm_clip_rect *clips,
 110                               unsigned int num_clips)
 111 {
 112         struct drm_modeset_acquire_ctx ctx;
 113         struct drm_property_blob *damage = NULL;
 114         struct drm_mode_rect *rects = NULL;
 115         struct drm_atomic_state *state;
 116         struct drm_plane *plane;
 117         int ret = 0;
 118
 119         /*
 120          * When called from ioctl, we are interruptible, but not when called
 121          * internally (ie. defio worker)
 122          */
 123         drm_modeset_acquire_init(&ctx,
 124                 file_priv ? DRM_MODESET_ACQUIRE_INTERRUPTIBLE : 0);
 125
 126         state = drm_atomic_state_alloc(fb->dev);
 127         if (!state) {
 128                 ret = -ENOMEM;
 129                 goto out_drop_locks;
 130         }
 131         state->acquire_ctx = &ctx;
 132
 133         if (clips) {
 134                 uint32_t inc = 1;
 135
 136                 if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
 137                         inc = 2;
 138                         num_clips /= 2;
 139                 }
 140
 141                 rects = kcalloc(num_clips, sizeof(*rects), GFP_KERNEL);
 142                 if (!rects) {
 143                         ret = -ENOMEM;
 144                         goto out;
 145                 }
 146
 147                 convert_clip_rect_to_rect(clips, rects, num_clips, inc);
 148                 damage = drm_property_create_blob(fb->dev,
 149                                                   num_clips * sizeof(*rects),
 150                                                   rects);
 151                 if (IS_ERR(damage)) {
 152                         ret = PTR_ERR(damage);
 153                         damage = NULL;
 154                         goto out;
 155                 }
 156         }
 157
 158 retry:
 159         drm_for_each_plane(plane, fb->dev) {
 160                 struct drm_plane_state *plane_state;
 161
 162                 ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 163                 if (ret)
 164                         goto out;
 165
 166                 if (plane->state->fb != fb) {
 167                         drm_modeset_unlock(&plane->mutex);
 168                         continue;
 169                 }
 170
 171                 plane_state = drm_atomic_get_plane_state(state, plane);
 172                 if (IS_ERR(plane_state)) {
 173                         ret = PTR_ERR(plane_state);
 174                         goto out;
 175                 }
 176
 177                 drm_property_replace_blob(&plane_state->fb_damage_clips,
 178                                           damage);
 179         }
 180
 181         ret = drm_atomic_commit(state);
 182
 183 out:
 184         if (ret == -EDEADLK) {
 185                 drm_atomic_state_clear(state);
 186                 ret = drm_modeset_backoff(&ctx);
 187                 if (!ret)
 188                         goto retry;
 189         }
 190
 191         drm_property_blob_put(damage);
 192         kfree(rects);
 193         drm_atomic_state_put(state);
 194
 195 out_drop_locks:
 196         drm_modeset_drop_locks(&ctx);
 197         drm_modeset_acquire_fini(&ctx);
 198
 199         return ret;
 200
 201 }
 202 EXPORT_SYMBOL(drm_atomic_helper_dirtyfb);
 203
 204 /**
 205  * drm_atomic_helper_damage_iter_init - Initialize the damage iterator.
 206  * @iter: The iterator to initialize.
 207  * @old_state: Old plane state for validation.
 208  * @state: Plane state from which to iterate the damage clips.
 209  *
 210  * Initialize an iterator, which clips plane damage
 211  * &drm_plane_state.fb_damage_clips to plane &drm_plane_state.src. This iterator
 212  * returns full plane src in case damage is not present because either
 213  * user-space didn't sent or driver discarded it (it want to do full plane
 214  * update). Currently this iterator returns full plane src in case plane src
 215  * changed but that can be changed in future to return damage.
 216  *
 217  * For the case when plane is not visible or plane update should not happen the
 218  * first call to iter_next will return false. Note that this helper use clipped
 219  * &drm_plane_state.src, so driver calling this helper should have called
 220  * drm_atomic_helper_check_plane_state() earlier.
 221  */
 222 void
 223 drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter,
 224                                    const struct drm_plane_state *old_state,
 225                                    const struct drm_plane_state *state)
 226 {
 227         struct drm_rect src;
 228         memset(iter, 0, sizeof(*iter));
 229
 230         if (!state || !state->crtc || !state->fb || !state->visible)
 231                 return;
 232
 233         iter->clips = (struct drm_rect *)drm_plane_get_damage_clips(state);
 234         iter->num_clips = drm_plane_get_damage_clips_count(state);
 235
 236         /* Round down for x1/y1 and round up for x2/y2 to catch all pixels */
 237         src = drm_plane_state_src(state);
 238
 239         iter->plane_src.x1 = src.x1 >> 16;
 240         iter->plane_src.y1 = src.y1 >> 16;
 241         iter->plane_src.x2 = (src.x2 >> 16) + !!(src.x2 & 0xFFFF);
 242         iter->plane_src.y2 = (src.y2 >> 16) + !!(src.y2 & 0xFFFF);
 243
 244         if (!iter->clips || !drm_rect_equals(&state->src, &old_state->src)) {
 245                 iter->clips = NULL;
 246                 iter->num_clips = 0;
 247                 iter->full_update = true;
 248         }
 249 }
 250 EXPORT_SYMBOL(drm_atomic_helper_damage_iter_init);
 251
 252 /**
 253  * drm_atomic_helper_damage_iter_next - Advance the damage iterator.
 254  * @iter: The iterator to advance.
 255  * @rect: Return a rectangle in fb coordinate clipped to plane src.
 256  *
 257  * Since plane src is in 16.16 fixed point and damage clips are whole number,
 258  * this iterator round off clips that intersect with plane src. Round down for
 259  * x1/y1 and round up for x2/y2 for the intersected coordinate. Similar rounding
 260  * off for full plane src, in case it's returned as damage. This iterator will
 261  * skip damage clips outside of plane src.
 262  *
 263  * Return: True if the output is valid, false if reached the end.
 264  *
 265  * If the first call to iterator next returns false then it means no need to
 266  * update the plane.
 267  */
 268 bool
 269 drm_atomic_helper_damage_iter_next(struct drm_atomic_helper_damage_iter *iter,
 270                                    struct drm_rect *rect)
 271 {
 272         bool ret = false;
 273
 274         if (iter->full_update) {
 275                 *rect = iter->plane_src;
 276                 iter->full_update = false;
 277                 return true;
 278         }
 279
 280         while (iter->curr_clip < iter->num_clips) {
 281                 *rect = iter->clips[iter->curr_clip];
 282                 iter->curr_clip++;
 283
 284                 if (drm_rect_intersect(rect, &iter->plane_src)) {
 285                         ret = true;
 286                         break;
 287                 }
 288         }
 289
 290         return ret;
 291 }
 292 EXPORT_SYMBOL(drm_atomic_helper_damage_iter_next);
 293
 294 /**
 295  * drm_atomic_helper_damage_merged - Merged plane damage
 296  * @old_state: Old plane state for validation.
 297  * @state: Plane state from which to iterate the damage clips.
 298  * @rect: Returns the merged damage rectangle
 299  *
 300  * This function merges any valid plane damage clips into one rectangle and
 301  * returns it in @rect.
 302  *
 303  * For details see: drm_atomic_helper_damage_iter_init() and
 304  * drm_atomic_helper_damage_iter_next().
 305  *
 306  * Returns:
 307  * True if there is valid plane damage otherwise false.
 308  */
 309 bool drm_atomic_helper_damage_merged(const struct drm_plane_state *old_state,
 310                                      struct drm_plane_state *state,
 311                                      struct drm_rect *rect)
 312 {
 313         struct drm_atomic_helper_damage_iter iter;
 314         struct drm_rect clip;
 315         bool valid = false;
 316
 317         rect->x1 = INT_MAX;
 318         rect->y1 = INT_MAX;
 319         rect->x2 = 0;
 320         rect->y2 = 0;
 321
 322         drm_atomic_helper_damage_iter_init(&iter, old_state, state);
 323         drm_atomic_for_each_plane_damage(&iter, &clip) {
 324                 rect->x1 = min(rect->x1, clip.x1);
 325                 rect->y1 = min(rect->y1, clip.y1);
 326                 rect->x2 = max(rect->x2, clip.x2);
 327                 rect->y2 = max(rect->y2, clip.y2);
 328                 valid = true;
 329         }
 330
 331         return valid;
 332 }
 333 EXPORT_SYMBOL(drm_atomic_helper_damage_merged);