drivers/gpu/drm/qxl/qxl_release.c

   1 /*
   2  * Copyright 2011 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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 NON-INFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  19  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22 #include "qxl_drv.h"
  23 #include "qxl_object.h"
  24 #include <trace/events/fence.h>
  25
  26 /*
  27  * drawable cmd cache - allocate a bunch of VRAM pages, suballocate
  28  * into 256 byte chunks for now - gives 16 cmds per page.
  29  *
  30  * use an ida to index into the chunks?
  31  */
  32 /* manage releaseables */
  33 /* stack them 16 high for now -drawable object is 191 */
  34 #define RELEASE_SIZE 256
  35 #define RELEASES_PER_BO (4096 / RELEASE_SIZE)
  36 /* put an alloc/dealloc surface cmd into one bo and round up to 128 */
  37 #define SURFACE_RELEASE_SIZE 128
  38 #define SURFACE_RELEASES_PER_BO (4096 / SURFACE_RELEASE_SIZE)
  39
  40 static const int release_size_per_bo[] = { RELEASE_SIZE, SURFACE_RELEASE_SIZE, RELEASE_SIZE };
  41 static const int releases_per_bo[] = { RELEASES_PER_BO, SURFACE_RELEASES_PER_BO, RELEASES_PER_BO };
  42
  43 static const char *qxl_get_driver_name(struct fence *fence)
  44 {
  45         return "qxl";
  46 }
  47
  48 static const char *qxl_get_timeline_name(struct fence *fence)
  49 {
  50         return "release";
  51 }
  52
  53 static bool qxl_nop_signaling(struct fence *fence)
  54 {
  55         /* fences are always automatically signaled, so just pretend we did this.. */
  56         return true;
  57 }
  58
  59 static long qxl_fence_wait(struct fence *fence, bool intr, signed long timeout)
  60 {
  61         struct qxl_device *qdev;
  62         struct qxl_release *release;
  63         int count = 0, sc = 0;
  64         bool have_drawable_releases;
  65         unsigned long cur, end = jiffies + timeout;
  66
  67         qdev = container_of(fence->lock, struct qxl_device, release_lock);
  68         release = container_of(fence, struct qxl_release, base);
  69         have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
  70
  71 retry:
  72         sc++;
  73
  74         if (fence_is_signaled(fence))
  75                 goto signaled;
  76
  77         qxl_io_notify_oom(qdev);
  78
  79         for (count = 0; count < 11; count++) {
  80                 if (!qxl_queue_garbage_collect(qdev, true))
  81                         break;
  82
  83                 if (fence_is_signaled(fence))
  84                         goto signaled;
  85         }
  86
  87         if (fence_is_signaled(fence))
  88                 goto signaled;
  89
  90         if (have_drawable_releases || sc < 4) {
  91                 if (sc > 2)
  92                         /* back off */
  93                         usleep_range(500, 1000);
  94
  95                 if (time_after(jiffies, end))
  96                         return 0;
  97
  98                 if (have_drawable_releases && sc > 300) {
  99                         FENCE_WARN(fence, "failed to wait on release %d "
 100                                           "after spincount %d\n",
 101                                           fence->context & ~0xf0000000, sc);
 102                         goto signaled;
 103                 }
 104                 goto retry;
 105         }
 106         /*
 107          * yeah, original sync_obj_wait gave up after 3 spins when
 108          * have_drawable_releases is not set.
 109          */
 110
 111 signaled:
 112         cur = jiffies;
 113         if (time_after(cur, end))
 114                 return 0;
 115         return end - cur;
 116 }
 117
 118 static const struct fence_ops qxl_fence_ops = {
 119         .get_driver_name = qxl_get_driver_name,
 120         .get_timeline_name = qxl_get_timeline_name,
 121         .enable_signaling = qxl_nop_signaling,
 122         .wait = qxl_fence_wait,
 123 };
 124
 125 static int
 126 qxl_release_alloc(struct qxl_device *qdev, int type,
 127                   struct qxl_release **ret)
 128 {
 129         struct qxl_release *release;
 130         int handle;
 131         size_t size = sizeof(*release);
 132
 133         release = kmalloc(size, GFP_KERNEL);
 134         if (!release) {
 135                 DRM_ERROR("Out of memory\n");
 136                 return 0;
 137         }
 138         release->base.ops = NULL;
 139         release->type = type;
 140         release->release_offset = 0;
 141         release->surface_release_id = 0;
 142         INIT_LIST_HEAD(&release->bos);
 143
 144         idr_preload(GFP_KERNEL);
 145         spin_lock(&qdev->release_idr_lock);
 146         handle = idr_alloc(&qdev->release_idr, release, 1, 0, GFP_NOWAIT);
 147         release->base.seqno = ++qdev->release_seqno;
 148         spin_unlock(&qdev->release_idr_lock);
 149         idr_preload_end();
 150         if (handle < 0) {
 151                 kfree(release);
 152                 *ret = NULL;
 153                 return handle;
 154         }
 155         *ret = release;
 156         QXL_INFO(qdev, "allocated release %d\n", handle);
 157         release->id = handle;
 158         return handle;
 159 }
 160
 161 static void
 162 qxl_release_free_list(struct qxl_release *release)
 163 {
 164         while (!list_empty(&release->bos)) {
 165                 struct qxl_bo_list *entry;
 166                 struct qxl_bo *bo;
 167
 168                 entry = container_of(release->bos.next,
 169                                      struct qxl_bo_list, tv.head);
 170                 bo = to_qxl_bo(entry->tv.bo);
 171                 qxl_bo_unref(&bo);
 172                 list_del(&entry->tv.head);
 173                 kfree(entry);
 174         }
 175 }
 176
 177 void
 178 qxl_release_free(struct qxl_device *qdev,
 179                  struct qxl_release *release)
 180 {
 181         QXL_INFO(qdev, "release %d, type %d\n", release->id,
 182                  release->type);
 183
 184         if (release->surface_release_id)
 185                 qxl_surface_id_dealloc(qdev, release->surface_release_id);
 186
 187         spin_lock(&qdev->release_idr_lock);
 188         idr_remove(&qdev->release_idr, release->id);
 189         spin_unlock(&qdev->release_idr_lock);
 190
 191         if (release->base.ops) {
 192                 WARN_ON(list_empty(&release->bos));
 193                 qxl_release_free_list(release);
 194
 195                 fence_signal(&release->base);
 196                 fence_put(&release->base);
 197         } else {
 198                 qxl_release_free_list(release);
 199                 kfree(release);
 200         }
 201 }
 202
 203 static int qxl_release_bo_alloc(struct qxl_device *qdev,
 204                                 struct qxl_bo **bo)
 205 {
 206         int ret;
 207         /* pin releases bo's they are too messy to evict */
 208         ret = qxl_bo_create(qdev, PAGE_SIZE, false, true,
 209                             QXL_GEM_DOMAIN_VRAM, NULL,
 210                             bo);
 211         return ret;
 212 }
 213
 214 int qxl_release_list_add(struct qxl_release *release, struct qxl_bo *bo)
 215 {
 216         struct qxl_bo_list *entry;
 217
 218         list_for_each_entry(entry, &release->bos, tv.head) {
 219                 if (entry->tv.bo == &bo->tbo)
 220                         return 0;
 221         }
 222
 223         entry = kmalloc(sizeof(struct qxl_bo_list), GFP_KERNEL);
 224         if (!entry)
 225                 return -ENOMEM;
 226
 227         qxl_bo_ref(bo);
 228         entry->tv.bo = &bo->tbo;
 229         entry->tv.shared = false;
 230         list_add_tail(&entry->tv.head, &release->bos);
 231         return 0;
 232 }
 233
 234 static int qxl_release_validate_bo(struct qxl_bo *bo)
 235 {
 236         int ret;
 237
 238         if (!bo->pin_count) {
 239                 qxl_ttm_placement_from_domain(bo, bo->type, false);
 240                 ret = ttm_bo_validate(&bo->tbo, &bo->placement,
 241                                       true, false);
 242                 if (ret)
 243                         return ret;
 244         }
 245
 246         ret = reservation_object_reserve_shared(bo->tbo.resv);
 247         if (ret)
 248                 return ret;
 249
 250         /* allocate a surface for reserved + validated buffers */
 251         ret = qxl_bo_check_id(bo->gem_base.dev->dev_private, bo);
 252         if (ret)
 253                 return ret;
 254         return 0;
 255 }
 256
 257 int qxl_release_reserve_list(struct qxl_release *release, bool no_intr)
 258 {
 259         int ret;
 260         struct qxl_bo_list *entry;
 261
 262         /* if only one object on the release its the release itself
 263            since these objects are pinned no need to reserve */
 264         if (list_is_singular(&release->bos))
 265                 return 0;
 266
 267         ret = ttm_eu_reserve_buffers(&release->ticket, &release->bos,
 268                                      !no_intr, NULL);
 269         if (ret)
 270                 return ret;
 271
 272         list_for_each_entry(entry, &release->bos, tv.head) {
 273                 struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
 274
 275                 ret = qxl_release_validate_bo(bo);
 276                 if (ret) {
 277                         ttm_eu_backoff_reservation(&release->ticket, &release->bos);
 278                         return ret;
 279                 }
 280         }
 281         return 0;
 282 }
 283
 284 void qxl_release_backoff_reserve_list(struct qxl_release *release)
 285 {
 286         /* if only one object on the release its the release itself
 287            since these objects are pinned no need to reserve */
 288         if (list_is_singular(&release->bos))
 289                 return;
 290
 291         ttm_eu_backoff_reservation(&release->ticket, &release->bos);
 292 }
 293
 294
 295 int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
 296                                        enum qxl_surface_cmd_type surface_cmd_type,
 297                                        struct qxl_release *create_rel,
 298                                        struct qxl_release **release)
 299 {
 300         if (surface_cmd_type == QXL_SURFACE_CMD_DESTROY && create_rel) {
 301                 int idr_ret;
 302                 struct qxl_bo_list *entry = list_first_entry(&create_rel->bos, struct qxl_bo_list, tv.head);
 303                 struct qxl_bo *bo;
 304                 union qxl_release_info *info;
 305
 306                 /* stash the release after the create command */
 307                 idr_ret = qxl_release_alloc(qdev, QXL_RELEASE_SURFACE_CMD, release);
 308                 if (idr_ret < 0)
 309                         return idr_ret;
 310                 bo = qxl_bo_ref(to_qxl_bo(entry->tv.bo));
 311
 312                 (*release)->release_offset = create_rel->release_offset + 64;
 313
 314                 qxl_release_list_add(*release, bo);
 315
 316                 info = qxl_release_map(qdev, *release);
 317                 info->id = idr_ret;
 318                 qxl_release_unmap(qdev, *release, info);
 319
 320                 qxl_bo_unref(&bo);
 321                 return 0;
 322         }
 323
 324         return qxl_alloc_release_reserved(qdev, sizeof(struct qxl_surface_cmd),
 325                                          QXL_RELEASE_SURFACE_CMD, release, NULL);
 326 }
 327
 328 int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 329                                        int type, struct qxl_release **release,
 330                                        struct qxl_bo **rbo)
 331 {
 332         struct qxl_bo *bo;
 333         int idr_ret;
 334         int ret = 0;
 335         union qxl_release_info *info;
 336         int cur_idx;
 337
 338         if (type == QXL_RELEASE_DRAWABLE)
 339                 cur_idx = 0;
 340         else if (type == QXL_RELEASE_SURFACE_CMD)
 341                 cur_idx = 1;
 342         else if (type == QXL_RELEASE_CURSOR_CMD)
 343                 cur_idx = 2;
 344         else {
 345                 DRM_ERROR("got illegal type: %d\n", type);
 346                 return -EINVAL;
 347         }
 348
 349         idr_ret = qxl_release_alloc(qdev, type, release);
 350         if (idr_ret < 0) {
 351                 if (rbo)
 352                         *rbo = NULL;
 353                 return idr_ret;
 354         }
 355
 356         mutex_lock(&qdev->release_mutex);
 357         if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {
 358                 qxl_bo_unref(&qdev->current_release_bo[cur_idx]);
 359                 qdev->current_release_bo_offset[cur_idx] = 0;
 360                 qdev->current_release_bo[cur_idx] = NULL;
 361         }
 362         if (!qdev->current_release_bo[cur_idx]) {
 363                 ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx]);
 364                 if (ret) {
 365                         mutex_unlock(&qdev->release_mutex);
 366                         qxl_release_free(qdev, *release);
 367                         return ret;
 368                 }
 369         }
 370
 371         bo = qxl_bo_ref(qdev->current_release_bo[cur_idx]);
 372
 373         (*release)->release_offset = qdev->current_release_bo_offset[cur_idx] * release_size_per_bo[cur_idx];
 374         qdev->current_release_bo_offset[cur_idx]++;
 375
 376         if (rbo)
 377                 *rbo = bo;
 378
 379         mutex_unlock(&qdev->release_mutex);
 380
 381         ret = qxl_release_list_add(*release, bo);
 382         qxl_bo_unref(&bo);
 383         if (ret) {
 384                 qxl_release_free(qdev, *release);
 385                 return ret;
 386         }
 387
 388         info = qxl_release_map(qdev, *release);
 389         info->id = idr_ret;
 390         qxl_release_unmap(qdev, *release, info);
 391
 392         return ret;
 393 }
 394
 395 struct qxl_release *qxl_release_from_id_locked(struct qxl_device *qdev,
 396                                                    uint64_t id)
 397 {
 398         struct qxl_release *release;
 399
 400         spin_lock(&qdev->release_idr_lock);
 401         release = idr_find(&qdev->release_idr, id);
 402         spin_unlock(&qdev->release_idr_lock);
 403         if (!release) {
 404                 DRM_ERROR("failed to find id in release_idr\n");
 405                 return NULL;
 406         }
 407
 408         return release;
 409 }
 410
 411 union qxl_release_info *qxl_release_map(struct qxl_device *qdev,
 412                                         struct qxl_release *release)
 413 {
 414         void *ptr;
 415         union qxl_release_info *info;
 416         struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
 417         struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
 418
 419         ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_SIZE);
 420         if (!ptr)
 421                 return NULL;
 422         info = ptr + (release->release_offset & ~PAGE_SIZE);
 423         return info;
 424 }
 425
 426 void qxl_release_unmap(struct qxl_device *qdev,
 427                        struct qxl_release *release,
 428                        union qxl_release_info *info)
 429 {
 430         struct qxl_bo_list *entry = list_first_entry(&release->bos, struct qxl_bo_list, tv.head);
 431         struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
 432         void *ptr;
 433
 434         ptr = ((void *)info) - (release->release_offset & ~PAGE_SIZE);
 435         qxl_bo_kunmap_atomic_page(qdev, bo, ptr);
 436 }
 437
 438 void qxl_release_fence_buffer_objects(struct qxl_release *release)
 439 {
 440         struct ttm_buffer_object *bo;
 441         struct ttm_bo_global *glob;
 442         struct ttm_bo_device *bdev;
 443         struct ttm_bo_driver *driver;
 444         struct qxl_bo *qbo;
 445         struct ttm_validate_buffer *entry;
 446         struct qxl_device *qdev;
 447
 448         /* if only one object on the release its the release itself
 449            since these objects are pinned no need to reserve */
 450         if (list_is_singular(&release->bos) || list_empty(&release->bos))
 451                 return;
 452
 453         bo = list_first_entry(&release->bos, struct ttm_validate_buffer, head)->bo;
 454         bdev = bo->bdev;
 455         qdev = container_of(bdev, struct qxl_device, mman.bdev);
 456
 457         /*
 458          * Since we never really allocated a context and we don't want to conflict,
 459          * set the highest bits. This will break if we really allow exporting of dma-bufs.
 460          */
 461         fence_init(&release->base, &qxl_fence_ops, &qdev->release_lock,
 462                    release->id | 0xf0000000, release->base.seqno);
 463         trace_fence_emit(&release->base);
 464
 465         driver = bdev->driver;
 466         glob = bo->glob;
 467
 468         spin_lock(&glob->lru_lock);
 469
 470         list_for_each_entry(entry, &release->bos, head) {
 471                 bo = entry->bo;
 472                 qbo = to_qxl_bo(bo);
 473
 474                 reservation_object_add_shared_fence(bo->resv, &release->base);
 475                 ttm_bo_add_to_lru(bo);
 476                 __ttm_bo_unreserve(bo);
 477         }
 478         spin_unlock(&glob->lru_lock);
 479         ww_acquire_fini(&release->ticket);
 480 }
 481