drivers/gpu/drm/qxl/qxl_cmd.c

   1 /*
   2  * Copyright 2013 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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Dave Airlie
  23  *          Alon Levy
  24  */
  25
  26 /* QXL cmd/ring handling */
  27
  28 #include <linux/delay.h>
  29
  30 #include <drm/drm_util.h>
  31
  32 #include "qxl_drv.h"
  33 #include "qxl_object.h"
  34
  35 static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap);
  36
  37 struct ring {
  38         struct qxl_ring_header      header;
  39         uint8_t                     elements[];
  40 };
  41
  42 struct qxl_ring {
  43         struct ring            *ring;
  44         int                     element_size;
  45         int                     n_elements;
  46         int                     prod_notify;
  47         wait_queue_head_t      *push_event;
  48         spinlock_t             lock;
  49 };
  50
  51 void qxl_ring_free(struct qxl_ring *ring)
  52 {
  53         kfree(ring);
  54 }
  55
  56 struct qxl_ring *
  57 qxl_ring_create(struct qxl_ring_header *header,
  58                 int element_size,
  59                 int n_elements,
  60                 int prod_notify,
  61                 wait_queue_head_t *push_event)
  62 {
  63         struct qxl_ring *ring;
  64
  65         ring = kmalloc(sizeof(*ring), GFP_KERNEL);
  66         if (!ring)
  67                 return NULL;
  68
  69         ring->ring = (struct ring *)header;
  70         ring->element_size = element_size;
  71         ring->n_elements = n_elements;
  72         ring->prod_notify = prod_notify;
  73         ring->push_event = push_event;
  74         spin_lock_init(&ring->lock);
  75         return ring;
  76 }
  77
  78 static int qxl_check_header(struct qxl_ring *ring)
  79 {
  80         int ret;
  81         struct qxl_ring_header *header = &(ring->ring->header);
  82         unsigned long flags;
  83
  84         spin_lock_irqsave(&ring->lock, flags);
  85         ret = header->prod - header->cons < header->num_items;
  86         if (ret == 0)
  87                 header->notify_on_cons = header->cons + 1;
  88         spin_unlock_irqrestore(&ring->lock, flags);
  89         return ret;
  90 }
  91
  92 int qxl_check_idle(struct qxl_ring *ring)
  93 {
  94         int ret;
  95         struct qxl_ring_header *header = &(ring->ring->header);
  96         unsigned long flags;
  97
  98         spin_lock_irqsave(&ring->lock, flags);
  99         ret = header->prod == header->cons;
 100         spin_unlock_irqrestore(&ring->lock, flags);
 101         return ret;
 102 }
 103
 104 int qxl_ring_push(struct qxl_ring *ring,
 105                   const void *new_elt, bool interruptible)
 106 {
 107         struct qxl_ring_header *header = &(ring->ring->header);
 108         uint8_t *elt;
 109         int idx, ret;
 110         unsigned long flags;
 111
 112         spin_lock_irqsave(&ring->lock, flags);
 113         if (header->prod - header->cons == header->num_items) {
 114                 header->notify_on_cons = header->cons + 1;
 115                 mb();
 116                 spin_unlock_irqrestore(&ring->lock, flags);
 117                 if (!drm_can_sleep()) {
 118                         while (!qxl_check_header(ring))
 119                                 udelay(1);
 120                 } else {
 121                         if (interruptible) {
 122                                 ret = wait_event_interruptible(*ring->push_event,
 123                                                                qxl_check_header(ring));
 124                                 if (ret)
 125                                         return ret;
 126                         } else {
 127                                 wait_event(*ring->push_event,
 128                                            qxl_check_header(ring));
 129                         }
 130
 131                 }
 132                 spin_lock_irqsave(&ring->lock, flags);
 133         }
 134
 135         idx = header->prod & (ring->n_elements - 1);
 136         elt = ring->ring->elements + idx * ring->element_size;
 137
 138         memcpy((void *)elt, new_elt, ring->element_size);
 139
 140         header->prod++;
 141
 142         mb();
 143
 144         if (header->prod == header->notify_on_prod)
 145                 outb(0, ring->prod_notify);
 146
 147         spin_unlock_irqrestore(&ring->lock, flags);
 148         return 0;
 149 }
 150
 151 static bool qxl_ring_pop(struct qxl_ring *ring,
 152                          void *element)
 153 {
 154         volatile struct qxl_ring_header *header = &(ring->ring->header);
 155         volatile uint8_t *ring_elt;
 156         int idx;
 157         unsigned long flags;
 158
 159         spin_lock_irqsave(&ring->lock, flags);
 160         if (header->cons == header->prod) {
 161                 header->notify_on_prod = header->cons + 1;
 162                 spin_unlock_irqrestore(&ring->lock, flags);
 163                 return false;
 164         }
 165
 166         idx = header->cons & (ring->n_elements - 1);
 167         ring_elt = ring->ring->elements + idx * ring->element_size;
 168
 169         memcpy(element, (void *)ring_elt, ring->element_size);
 170
 171         header->cons++;
 172
 173         spin_unlock_irqrestore(&ring->lock, flags);
 174         return true;
 175 }
 176
 177 int
 178 qxl_push_command_ring_release(struct qxl_device *qdev, struct qxl_release *release,
 179                               uint32_t type, bool interruptible)
 180 {
 181         struct qxl_command cmd;
 182
 183         cmd.type = type;
 184         cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
 185
 186         return qxl_ring_push(qdev->command_ring, &cmd, interruptible);
 187 }
 188
 189 int
 190 qxl_push_cursor_ring_release(struct qxl_device *qdev, struct qxl_release *release,
 191                              uint32_t type, bool interruptible)
 192 {
 193         struct qxl_command cmd;
 194
 195         cmd.type = type;
 196         cmd.data = qxl_bo_physical_address(qdev, release->release_bo, release->release_offset);
 197
 198         return qxl_ring_push(qdev->cursor_ring, &cmd, interruptible);
 199 }
 200
 201 bool qxl_queue_garbage_collect(struct qxl_device *qdev, bool flush)
 202 {
 203         if (!qxl_check_idle(qdev->release_ring)) {
 204                 schedule_work(&qdev->gc_work);
 205                 if (flush)
 206                         flush_work(&qdev->gc_work);
 207                 return true;
 208         }
 209         return false;
 210 }
 211
 212 int qxl_garbage_collect(struct qxl_device *qdev)
 213 {
 214         struct qxl_release *release;
 215         uint64_t id, next_id;
 216         int i = 0;
 217         union qxl_release_info *info;
 218
 219         while (qxl_ring_pop(qdev->release_ring, &id)) {
 220                 DRM_DEBUG_DRIVER("popped %lld\n", id);
 221                 while (id) {
 222                         release = qxl_release_from_id_locked(qdev, id);
 223                         if (release == NULL)
 224                                 break;
 225
 226                         info = qxl_release_map(qdev, release);
 227                         next_id = info->next;
 228                         qxl_release_unmap(qdev, release, info);
 229
 230                         DRM_DEBUG_DRIVER("popped %lld, next %lld\n", id,
 231                                          next_id);
 232
 233                         switch (release->type) {
 234                         case QXL_RELEASE_DRAWABLE:
 235                         case QXL_RELEASE_SURFACE_CMD:
 236                         case QXL_RELEASE_CURSOR_CMD:
 237                                 break;
 238                         default:
 239                                 DRM_ERROR("unexpected release type\n");
 240                                 break;
 241                         }
 242                         id = next_id;
 243
 244                         qxl_release_free(qdev, release);
 245                         ++i;
 246                 }
 247         }
 248
 249         wake_up_all(&qdev->release_event);
 250         DRM_DEBUG_DRIVER("%d\n", i);
 251
 252         return i;
 253 }
 254
 255 int qxl_alloc_bo_reserved(struct qxl_device *qdev,
 256                           struct qxl_release *release,
 257                           unsigned long size,
 258                           struct qxl_bo **_bo)
 259 {
 260         struct qxl_bo *bo;
 261         int ret;
 262
 263         ret = qxl_bo_create(qdev, size, false /* not kernel - device */,
 264                             false, QXL_GEM_DOMAIN_VRAM, 0, NULL, &bo);
 265         if (ret) {
 266                 DRM_ERROR("failed to allocate VRAM BO\n");
 267                 return ret;
 268         }
 269         ret = qxl_release_list_add(release, bo);
 270         if (ret)
 271                 goto out_unref;
 272
 273         *_bo = bo;
 274         return 0;
 275 out_unref:
 276         qxl_bo_unref(&bo);
 277         return ret;
 278 }
 279
 280 static int wait_for_io_cmd_user(struct qxl_device *qdev, uint8_t val, long port, bool intr)
 281 {
 282         int irq_num;
 283         long addr = qdev->io_base + port;
 284         int ret;
 285
 286         mutex_lock(&qdev->async_io_mutex);
 287         irq_num = atomic_read(&qdev->irq_received_io_cmd);
 288         if (qdev->last_sent_io_cmd > irq_num) {
 289                 if (intr)
 290                         ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
 291                                                                atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
 292                 else
 293                         ret = wait_event_timeout(qdev->io_cmd_event,
 294                                                  atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
 295                 /* 0 is timeout, just bail the "hw" has gone away */
 296                 if (ret <= 0)
 297                         goto out;
 298                 irq_num = atomic_read(&qdev->irq_received_io_cmd);
 299         }
 300         outb(val, addr);
 301         qdev->last_sent_io_cmd = irq_num + 1;
 302         if (intr)
 303                 ret = wait_event_interruptible_timeout(qdev->io_cmd_event,
 304                                                        atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
 305         else
 306                 ret = wait_event_timeout(qdev->io_cmd_event,
 307                                          atomic_read(&qdev->irq_received_io_cmd) > irq_num, 5*HZ);
 308 out:
 309         if (ret > 0)
 310                 ret = 0;
 311         mutex_unlock(&qdev->async_io_mutex);
 312         return ret;
 313 }
 314
 315 static void wait_for_io_cmd(struct qxl_device *qdev, uint8_t val, long port)
 316 {
 317         int ret;
 318
 319 restart:
 320         ret = wait_for_io_cmd_user(qdev, val, port, false);
 321         if (ret == -ERESTARTSYS)
 322                 goto restart;
 323 }
 324
 325 int qxl_io_update_area(struct qxl_device *qdev, struct qxl_bo *surf,
 326                         const struct qxl_rect *area)
 327 {
 328         int surface_id;
 329         uint32_t surface_width, surface_height;
 330         int ret;
 331
 332         if (!surf->hw_surf_alloc)
 333                 DRM_ERROR("got io update area with no hw surface\n");
 334
 335         if (surf->is_primary)
 336                 surface_id = 0;
 337         else
 338                 surface_id = surf->surface_id;
 339         surface_width = surf->surf.width;
 340         surface_height = surf->surf.height;
 341
 342         if (area->left < 0 || area->top < 0 ||
 343             area->right > surface_width || area->bottom > surface_height)
 344                 return -EINVAL;
 345
 346         mutex_lock(&qdev->update_area_mutex);
 347         qdev->ram_header->update_area = *area;
 348         qdev->ram_header->update_surface = surface_id;
 349         ret = wait_for_io_cmd_user(qdev, 0, QXL_IO_UPDATE_AREA_ASYNC, true);
 350         mutex_unlock(&qdev->update_area_mutex);
 351         return ret;
 352 }
 353
 354 void qxl_io_notify_oom(struct qxl_device *qdev)
 355 {
 356         outb(0, qdev->io_base + QXL_IO_NOTIFY_OOM);
 357 }
 358
 359 void qxl_io_flush_release(struct qxl_device *qdev)
 360 {
 361         outb(0, qdev->io_base + QXL_IO_FLUSH_RELEASE);
 362 }
 363
 364 void qxl_io_flush_surfaces(struct qxl_device *qdev)
 365 {
 366         wait_for_io_cmd(qdev, 0, QXL_IO_FLUSH_SURFACES_ASYNC);
 367 }
 368
 369 void qxl_io_destroy_primary(struct qxl_device *qdev)
 370 {
 371         wait_for_io_cmd(qdev, 0, QXL_IO_DESTROY_PRIMARY_ASYNC);
 372         qdev->primary_bo->is_primary = false;
 373         drm_gem_object_put(&qdev->primary_bo->tbo.base);
 374         qdev->primary_bo = NULL;
 375 }
 376
 377 void qxl_io_create_primary(struct qxl_device *qdev, struct qxl_bo *bo)
 378 {
 379         struct qxl_surface_create *create;
 380
 381         if (WARN_ON(qdev->primary_bo))
 382                 return;
 383
 384         DRM_DEBUG_DRIVER("qdev %p, ram_header %p\n", qdev, qdev->ram_header);
 385         create = &qdev->ram_header->create_surface;
 386         create->format = bo->surf.format;
 387         create->width = bo->surf.width;
 388         create->height = bo->surf.height;
 389         create->stride = bo->surf.stride;
 390         create->mem = qxl_bo_physical_address(qdev, bo, 0);
 391
 392         DRM_DEBUG_DRIVER("mem = %llx, from %p\n", create->mem, bo->kptr);
 393
 394         create->flags = QXL_SURF_FLAG_KEEP_DATA;
 395         create->type = QXL_SURF_TYPE_PRIMARY;
 396
 397         wait_for_io_cmd(qdev, 0, QXL_IO_CREATE_PRIMARY_ASYNC);
 398         qdev->primary_bo = bo;
 399         qdev->primary_bo->is_primary = true;
 400         drm_gem_object_get(&qdev->primary_bo->tbo.base);
 401 }
 402
 403 void qxl_io_memslot_add(struct qxl_device *qdev, uint8_t id)
 404 {
 405         DRM_DEBUG_DRIVER("qxl_memslot_add %d\n", id);
 406         wait_for_io_cmd(qdev, id, QXL_IO_MEMSLOT_ADD_ASYNC);
 407 }
 408
 409 void qxl_io_reset(struct qxl_device *qdev)
 410 {
 411         outb(0, qdev->io_base + QXL_IO_RESET);
 412 }
 413
 414 void qxl_io_monitors_config(struct qxl_device *qdev)
 415 {
 416         wait_for_io_cmd(qdev, 0, QXL_IO_MONITORS_CONFIG_ASYNC);
 417 }
 418
 419 int qxl_surface_id_alloc(struct qxl_device *qdev,
 420                       struct qxl_bo *surf)
 421 {
 422         uint32_t handle;
 423         int idr_ret;
 424         int count = 0;
 425 again:
 426         idr_preload(GFP_ATOMIC);
 427         spin_lock(&qdev->surf_id_idr_lock);
 428         idr_ret = idr_alloc(&qdev->surf_id_idr, NULL, 1, 0, GFP_NOWAIT);
 429         spin_unlock(&qdev->surf_id_idr_lock);
 430         idr_preload_end();
 431         if (idr_ret < 0)
 432                 return idr_ret;
 433         handle = idr_ret;
 434
 435         if (handle >= qdev->rom->n_surfaces) {
 436                 count++;
 437                 spin_lock(&qdev->surf_id_idr_lock);
 438                 idr_remove(&qdev->surf_id_idr, handle);
 439                 spin_unlock(&qdev->surf_id_idr_lock);
 440                 qxl_reap_surface_id(qdev, 2);
 441                 goto again;
 442         }
 443         surf->surface_id = handle;
 444
 445         spin_lock(&qdev->surf_id_idr_lock);
 446         qdev->last_alloced_surf_id = handle;
 447         spin_unlock(&qdev->surf_id_idr_lock);
 448         return 0;
 449 }
 450
 451 void qxl_surface_id_dealloc(struct qxl_device *qdev,
 452                             uint32_t surface_id)
 453 {
 454         spin_lock(&qdev->surf_id_idr_lock);
 455         idr_remove(&qdev->surf_id_idr, surface_id);
 456         spin_unlock(&qdev->surf_id_idr_lock);
 457 }
 458
 459 int qxl_hw_surface_alloc(struct qxl_device *qdev,
 460                          struct qxl_bo *surf)
 461 {
 462         struct qxl_surface_cmd *cmd;
 463         struct qxl_release *release;
 464         int ret;
 465
 466         if (surf->hw_surf_alloc)
 467                 return 0;
 468
 469         ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_CREATE,
 470                                                  NULL,
 471                                                  &release);
 472         if (ret)
 473                 return ret;
 474
 475         ret = qxl_release_reserve_list(release, true);
 476         if (ret) {
 477                 qxl_release_free(qdev, release);
 478                 return ret;
 479         }
 480         cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
 481         cmd->type = QXL_SURFACE_CMD_CREATE;
 482         cmd->flags = QXL_SURF_FLAG_KEEP_DATA;
 483         cmd->u.surface_create.format = surf->surf.format;
 484         cmd->u.surface_create.width = surf->surf.width;
 485         cmd->u.surface_create.height = surf->surf.height;
 486         cmd->u.surface_create.stride = surf->surf.stride;
 487         cmd->u.surface_create.data = qxl_bo_physical_address(qdev, surf, 0);
 488         cmd->surface_id = surf->surface_id;
 489         qxl_release_unmap(qdev, release, &cmd->release_info);
 490
 491         surf->surf_create = release;
 492
 493         /* no need to add a release to the fence for this surface bo,
 494            since it is only released when we ask to destroy the surface
 495            and it would never signal otherwise */
 496         qxl_release_fence_buffer_objects(release);
 497         qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false);
 498
 499         surf->hw_surf_alloc = true;
 500         spin_lock(&qdev->surf_id_idr_lock);
 501         idr_replace(&qdev->surf_id_idr, surf, surf->surface_id);
 502         spin_unlock(&qdev->surf_id_idr_lock);
 503         return 0;
 504 }
 505
 506 int qxl_hw_surface_dealloc(struct qxl_device *qdev,
 507                            struct qxl_bo *surf)
 508 {
 509         struct qxl_surface_cmd *cmd;
 510         struct qxl_release *release;
 511         int ret;
 512         int id;
 513
 514         if (!surf->hw_surf_alloc)
 515                 return 0;
 516
 517         ret = qxl_alloc_surface_release_reserved(qdev, QXL_SURFACE_CMD_DESTROY,
 518                                                  surf->surf_create,
 519                                                  &release);
 520         if (ret)
 521                 return ret;
 522
 523         surf->surf_create = NULL;
 524         /* remove the surface from the idr, but not the surface id yet */
 525         spin_lock(&qdev->surf_id_idr_lock);
 526         idr_replace(&qdev->surf_id_idr, NULL, surf->surface_id);
 527         spin_unlock(&qdev->surf_id_idr_lock);
 528         surf->hw_surf_alloc = false;
 529
 530         id = surf->surface_id;
 531         surf->surface_id = 0;
 532
 533         release->surface_release_id = id;
 534         cmd = (struct qxl_surface_cmd *)qxl_release_map(qdev, release);
 535         cmd->type = QXL_SURFACE_CMD_DESTROY;
 536         cmd->surface_id = id;
 537         qxl_release_unmap(qdev, release, &cmd->release_info);
 538
 539         qxl_release_fence_buffer_objects(release);
 540         qxl_push_command_ring_release(qdev, release, QXL_CMD_SURFACE, false);
 541
 542         return 0;
 543 }
 544
 545 static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf)
 546 {
 547         struct qxl_rect rect;
 548         int ret;
 549
 550         /* if we are evicting, we need to make sure the surface is up
 551            to date */
 552         rect.left = 0;
 553         rect.right = surf->surf.width;
 554         rect.top = 0;
 555         rect.bottom = surf->surf.height;
 556 retry:
 557         ret = qxl_io_update_area(qdev, surf, &rect);
 558         if (ret == -ERESTARTSYS)
 559                 goto retry;
 560         return ret;
 561 }
 562
 563 static void qxl_surface_evict_locked(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
 564 {
 565         /* no need to update area if we are just freeing the surface normally */
 566         if (do_update_area)
 567                 qxl_update_surface(qdev, surf);
 568
 569         /* nuke the surface id at the hw */
 570         qxl_hw_surface_dealloc(qdev, surf);
 571 }
 572
 573 void qxl_surface_evict(struct qxl_device *qdev, struct qxl_bo *surf, bool do_update_area)
 574 {
 575         mutex_lock(&qdev->surf_evict_mutex);
 576         qxl_surface_evict_locked(qdev, surf, do_update_area);
 577         mutex_unlock(&qdev->surf_evict_mutex);
 578 }
 579
 580 static int qxl_reap_surf(struct qxl_device *qdev, struct qxl_bo *surf, bool stall)
 581 {
 582         int ret;
 583
 584         ret = qxl_bo_reserve(surf);
 585         if (ret)
 586                 return ret;
 587
 588         if (stall)
 589                 mutex_unlock(&qdev->surf_evict_mutex);
 590
 591         ret = ttm_bo_wait(&surf->tbo, true, !stall);
 592
 593         if (stall)
 594                 mutex_lock(&qdev->surf_evict_mutex);
 595         if (ret) {
 596                 qxl_bo_unreserve(surf);
 597                 return ret;
 598         }
 599
 600         qxl_surface_evict_locked(qdev, surf, true);
 601         qxl_bo_unreserve(surf);
 602         return 0;
 603 }
 604
 605 static int qxl_reap_surface_id(struct qxl_device *qdev, int max_to_reap)
 606 {
 607         int num_reaped = 0;
 608         int i, ret;
 609         bool stall = false;
 610         int start = 0;
 611
 612         mutex_lock(&qdev->surf_evict_mutex);
 613 again:
 614
 615         spin_lock(&qdev->surf_id_idr_lock);
 616         start = qdev->last_alloced_surf_id + 1;
 617         spin_unlock(&qdev->surf_id_idr_lock);
 618
 619         for (i = start; i < start + qdev->rom->n_surfaces; i++) {
 620                 void *objptr;
 621                 int surfid = i % qdev->rom->n_surfaces;
 622
 623                 /* this avoids the case where the objects is in the
 624                    idr but has been evicted half way - its makes
 625                    the idr lookup atomic with the eviction */
 626                 spin_lock(&qdev->surf_id_idr_lock);
 627                 objptr = idr_find(&qdev->surf_id_idr, surfid);
 628                 spin_unlock(&qdev->surf_id_idr_lock);
 629
 630                 if (!objptr)
 631                         continue;
 632
 633                 ret = qxl_reap_surf(qdev, objptr, stall);
 634                 if (ret == 0)
 635                         num_reaped++;
 636                 if (num_reaped >= max_to_reap)
 637                         break;
 638         }
 639         if (num_reaped == 0 && stall == false) {
 640                 stall = true;
 641                 goto again;
 642         }
 643
 644         mutex_unlock(&qdev->surf_evict_mutex);
 645         if (num_reaped) {
 646                 usleep_range(500, 1000);
 647                 qxl_queue_garbage_collect(qdev, true);
 648         }
 649
 650         return 0;
 651 }