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/dma_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 dma_fence *fence)
  44 {
  45         return "qxl";
  46 }
  47
  48 static const char *qxl_get_timeline_name(struct dma_fence *fence)
  49 {
  50         return "release";
  51 }
  52
  53 static long qxl_fence_wait(struct dma_fence *fence, bool intr,
  54                            signed long timeout)
  55 {
  56         struct qxl_device *qdev;
  57         struct qxl_release *release;
  58         int count = 0, sc = 0;
  59         bool have_drawable_releases;
  60         unsigned long cur, end = jiffies + timeout;
  61
  62         qdev = container_of(fence->lock, struct qxl_device, release_lock);
  63         release = container_of(fence, struct qxl_release, base);
  64         have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
  65
  66 retry:
  67         sc++;
  68
  69         if (dma_fence_is_signaled(fence))
  70                 goto signaled;
  71
  72         qxl_io_notify_oom(qdev);
  73
  74         for (count = 0; count < 11; count++) {
  75                 if (!qxl_queue_garbage_collect(qdev, true))
  76                         break;
  77
  78                 if (dma_fence_is_signaled(fence))
  79                         goto signaled;
  80         }
  81
  82         if (dma_fence_is_signaled(fence))
  83                 goto signaled;
  84
  85         if (have_drawable_releases || sc < 4) {
  86                 if (sc > 2)
  87                         /* back off */
  88                         usleep_range(500, 1000);
  89
  90                 if (time_after(jiffies, end))
  91                         return 0;
  92
  93                 if (have_drawable_releases && sc > 300) {
  94                         DMA_FENCE_WARN(fence, "failed to wait on release %llu "
  95                                        "after spincount %d\n",
  96                                        fence->context & ~0xf0000000, sc);
  97                         goto signaled;
  98                 }
  99                 goto retry;
 100         }
 101         /*
 102          * yeah, original sync_obj_wait gave up after 3 spins when
 103          * have_drawable_releases is not set.
 104          */
 105
 106 signaled:
 107         cur = jiffies;
 108         if (time_after(cur, end))
 109                 return 0;
 110         return end - cur;
 111 }
 112
 113 static const struct dma_fence_ops qxl_fence_ops = {
 114         .get_driver_name = qxl_get_driver_name,
 115         .get_timeline_name = qxl_get_timeline_name,
 116         .wait = qxl_fence_wait,
 117 };
 118
 119 static int
 120 qxl_release_alloc(struct qxl_device *qdev, int type,
 121                   struct qxl_release **ret)
 122 {
 123         struct qxl_release *release;
 124         int handle;
 125         size_t size = sizeof(*release);
 126
 127         release = kmalloc(size, GFP_KERNEL);
 128         if (!release) {
 129                 DRM_ERROR("Out of memory\n");
 130                 return -ENOMEM;
 131         }
 132         release->base.ops = NULL;
 133         release->type = type;
 134         release->release_offset = 0;
 135         release->surface_release_id = 0;
 136         INIT_LIST_HEAD(&release->bos);
 137
 138         idr_preload(GFP_KERNEL);
 139         spin_lock(&qdev->release_idr_lock);
 140         handle = idr_alloc(&qdev->release_idr, release, 1, 0, GFP_NOWAIT);
 141         release->base.seqno = ++qdev->release_seqno;
 142         spin_unlock(&qdev->release_idr_lock);
 143         idr_preload_end();
 144         if (handle < 0) {
 145                 kfree(release);
 146                 *ret = NULL;
 147                 return handle;
 148         }
 149         *ret = release;
 150         DRM_DEBUG_DRIVER("allocated release %d\n", handle);
 151         release->id = handle;
 152         return handle;
 153 }
 154
 155 static void
 156 qxl_release_free_list(struct qxl_release *release)
 157 {
 158         while (!list_empty(&release->bos)) {
 159                 struct qxl_bo_list *entry;
 160                 struct qxl_bo *bo;
 161
 162                 entry = container_of(release->bos.next,
 163                                      struct qxl_bo_list, tv.head);
 164                 bo = to_qxl_bo(entry->tv.bo);
 165                 qxl_bo_unref(&bo);
 166                 list_del(&entry->tv.head);
 167                 kfree(entry);
 168         }
 169         release->release_bo = NULL;
 170 }
 171
 172 void
 173 qxl_release_free(struct qxl_device *qdev,
 174                  struct qxl_release *release)
 175 {
 176         DRM_DEBUG_DRIVER("release %d, type %d\n", release->id, release->type);
 177
 178         if (release->surface_release_id)
 179                 qxl_surface_id_dealloc(qdev, release->surface_release_id);
 180
 181         spin_lock(&qdev->release_idr_lock);
 182         idr_remove(&qdev->release_idr, release->id);
 183         spin_unlock(&qdev->release_idr_lock);
 184
 185         if (release->base.ops) {
 186                 WARN_ON(list_empty(&release->bos));
 187                 qxl_release_free_list(release);
 188
 189                 dma_fence_signal(&release->base);
 190                 dma_fence_put(&release->base);
 191         } else {
 192                 qxl_release_free_list(release);
 193                 kfree(release);
 194         }
 195 }
 196
 197 static int qxl_release_bo_alloc(struct qxl_device *qdev,
 198                                 struct qxl_bo **bo)
 199 {
 200         /* pin releases bo's they are too messy to evict */
 201         return qxl_bo_create(qdev, PAGE_SIZE, false, true,
 202                              QXL_GEM_DOMAIN_VRAM, NULL, bo);
 203 }
 204
 205 int qxl_release_list_add(struct qxl_release *release, struct qxl_bo *bo)
 206 {
 207         struct qxl_bo_list *entry;
 208
 209         list_for_each_entry(entry, &release->bos, tv.head) {
 210                 if (entry->tv.bo == &bo->tbo)
 211                         return 0;
 212         }
 213
 214         entry = kmalloc(sizeof(struct qxl_bo_list), GFP_KERNEL);
 215         if (!entry)
 216                 return -ENOMEM;
 217
 218         qxl_bo_ref(bo);
 219         entry->tv.bo = &bo->tbo;
 220         entry->tv.num_shared = 0;
 221         list_add_tail(&entry->tv.head, &release->bos);
 222         return 0;
 223 }
 224
 225 static int qxl_release_validate_bo(struct qxl_bo *bo)
 226 {
 227         struct ttm_operation_ctx ctx = { true, false };
 228         int ret;
 229
 230         if (!bo->pin_count) {
 231                 qxl_ttm_placement_from_domain(bo, bo->type, false);
 232                 ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 233                 if (ret)
 234                         return ret;
 235         }
 236
 237         ret = reservation_object_reserve_shared(bo->tbo.resv, 1);
 238         if (ret)
 239                 return ret;
 240
 241         /* allocate a surface for reserved + validated buffers */
 242         ret = qxl_bo_check_id(bo->gem_base.dev->dev_private, bo);
 243         if (ret)
 244                 return ret;
 245         return 0;
 246 }
 247
 248 int qxl_release_reserve_list(struct qxl_release *release, bool no_intr)
 249 {
 250         int ret;
 251         struct qxl_bo_list *entry;
 252
 253         /* if only one object on the release its the release itself
 254            since these objects are pinned no need to reserve */
 255         if (list_is_singular(&release->bos))
 256                 return 0;
 257
 258         ret = ttm_eu_reserve_buffers(&release->ticket, &release->bos,
 259                                      !no_intr, NULL, true);
 260         if (ret)
 261                 return ret;
 262
 263         list_for_each_entry(entry, &release->bos, tv.head) {
 264                 struct qxl_bo *bo = to_qxl_bo(entry->tv.bo);
 265
 266                 ret = qxl_release_validate_bo(bo);
 267                 if (ret) {
 268                         ttm_eu_backoff_reservation(&release->ticket, &release->bos);
 269                         return ret;
 270                 }
 271         }
 272         return 0;
 273 }
 274
 275 void qxl_release_backoff_reserve_list(struct qxl_release *release)
 276 {
 277         /* if only one object on the release its the release itself
 278            since these objects are pinned no need to reserve */
 279         if (list_is_singular(&release->bos))
 280                 return;
 281
 282         ttm_eu_backoff_reservation(&release->ticket, &release->bos);
 283 }
 284
 285 int qxl_alloc_surface_release_reserved(struct qxl_device *qdev,
 286                                        enum qxl_surface_cmd_type surface_cmd_type,
 287                                        struct qxl_release *create_rel,
 288                                        struct qxl_release **release)
 289 {
 290         if (surface_cmd_type == QXL_SURFACE_CMD_DESTROY && create_rel) {
 291                 int idr_ret;
 292                 struct qxl_bo *bo;
 293                 union qxl_release_info *info;
 294
 295                 /* stash the release after the create command */
 296                 idr_ret = qxl_release_alloc(qdev, QXL_RELEASE_SURFACE_CMD, release);
 297                 if (idr_ret < 0)
 298                         return idr_ret;
 299                 bo = create_rel->release_bo;
 300
 301                 (*release)->release_bo = bo;
 302                 (*release)->release_offset = create_rel->release_offset + 64;
 303
 304                 qxl_release_list_add(*release, bo);
 305
 306                 info = qxl_release_map(qdev, *release);
 307                 info->id = idr_ret;
 308                 qxl_release_unmap(qdev, *release, info);
 309                 return 0;
 310         }
 311
 312         return qxl_alloc_release_reserved(qdev, sizeof(struct qxl_surface_cmd),
 313                                          QXL_RELEASE_SURFACE_CMD, release, NULL);
 314 }
 315
 316 int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
 317                                        int type, struct qxl_release **release,
 318                                        struct qxl_bo **rbo)
 319 {
 320         struct qxl_bo *bo;
 321         int idr_ret;
 322         int ret = 0;
 323         union qxl_release_info *info;
 324         int cur_idx;
 325
 326         if (type == QXL_RELEASE_DRAWABLE)
 327                 cur_idx = 0;
 328         else if (type == QXL_RELEASE_SURFACE_CMD)
 329                 cur_idx = 1;
 330         else if (type == QXL_RELEASE_CURSOR_CMD)
 331                 cur_idx = 2;
 332         else {
 333                 DRM_ERROR("got illegal type: %d\n", type);
 334                 return -EINVAL;
 335         }
 336
 337         idr_ret = qxl_release_alloc(qdev, type, release);
 338         if (idr_ret < 0) {
 339                 if (rbo)
 340                         *rbo = NULL;
 341                 return idr_ret;
 342         }
 343
 344         mutex_lock(&qdev->release_mutex);
 345         if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {
 346                 qxl_bo_unref(&qdev->current_release_bo[cur_idx]);
 347                 qdev->current_release_bo_offset[cur_idx] = 0;
 348                 qdev->current_release_bo[cur_idx] = NULL;
 349         }
 350         if (!qdev->current_release_bo[cur_idx]) {
 351                 ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx]);
 352                 if (ret) {
 353                         mutex_unlock(&qdev->release_mutex);
 354                         qxl_release_free(qdev, *release);
 355                         return ret;
 356                 }
 357         }
 358
 359         bo = qxl_bo_ref(qdev->current_release_bo[cur_idx]);
 360
 361         (*release)->release_bo = bo;
 362         (*release)->release_offset = qdev->current_release_bo_offset[cur_idx] * release_size_per_bo[cur_idx];
 363         qdev->current_release_bo_offset[cur_idx]++;
 364
 365         if (rbo)
 366                 *rbo = bo;
 367
 368         mutex_unlock(&qdev->release_mutex);
 369
 370         ret = qxl_release_list_add(*release, bo);
 371         qxl_bo_unref(&bo);
 372         if (ret) {
 373                 qxl_release_free(qdev, *release);
 374                 return ret;
 375         }
 376
 377         info = qxl_release_map(qdev, *release);
 378         info->id = idr_ret;
 379         qxl_release_unmap(qdev, *release, info);
 380
 381         return ret;
 382 }
 383
 384 struct qxl_release *qxl_release_from_id_locked(struct qxl_device *qdev,
 385                                                    uint64_t id)
 386 {
 387         struct qxl_release *release;
 388
 389         spin_lock(&qdev->release_idr_lock);
 390         release = idr_find(&qdev->release_idr, id);
 391         spin_unlock(&qdev->release_idr_lock);
 392         if (!release) {
 393                 DRM_ERROR("failed to find id in release_idr\n");
 394                 return NULL;
 395         }
 396
 397         return release;
 398 }
 399
 400 union qxl_release_info *qxl_release_map(struct qxl_device *qdev,
 401                                         struct qxl_release *release)
 402 {
 403         void *ptr;
 404         union qxl_release_info *info;
 405         struct qxl_bo *bo = release->release_bo;
 406
 407         ptr = qxl_bo_kmap_atomic_page(qdev, bo, release->release_offset & PAGE_MASK);
 408         if (!ptr)
 409                 return NULL;
 410         info = ptr + (release->release_offset & ~PAGE_MASK);
 411         return info;
 412 }
 413
 414 void qxl_release_unmap(struct qxl_device *qdev,
 415                        struct qxl_release *release,
 416                        union qxl_release_info *info)
 417 {
 418         struct qxl_bo *bo = release->release_bo;
 419         void *ptr;
 420
 421         ptr = ((void *)info) - (release->release_offset & ~PAGE_MASK);
 422         qxl_bo_kunmap_atomic_page(qdev, bo, ptr);
 423 }
 424
 425 void qxl_release_fence_buffer_objects(struct qxl_release *release)
 426 {
 427         struct ttm_buffer_object *bo;
 428         struct ttm_bo_global *glob;
 429         struct ttm_bo_device *bdev;
 430         struct ttm_validate_buffer *entry;
 431         struct qxl_device *qdev;
 432
 433         /* if only one object on the release its the release itself
 434            since these objects are pinned no need to reserve */
 435         if (list_is_singular(&release->bos) || list_empty(&release->bos))
 436                 return;
 437
 438         bo = list_first_entry(&release->bos, struct ttm_validate_buffer, head)->bo;
 439         bdev = bo->bdev;
 440         qdev = container_of(bdev, struct qxl_device, mman.bdev);
 441
 442         /*
 443          * Since we never really allocated a context and we don't want to conflict,
 444          * set the highest bits. This will break if we really allow exporting of dma-bufs.
 445          */
 446         dma_fence_init(&release->base, &qxl_fence_ops, &qdev->release_lock,
 447                        release->id | 0xf0000000, release->base.seqno);
 448         trace_dma_fence_emit(&release->base);
 449
 450         glob = bdev->glob;
 451
 452         spin_lock(&glob->lru_lock);
 453
 454         list_for_each_entry(entry, &release->bos, head) {
 455                 bo = entry->bo;
 456
 457                 reservation_object_add_shared_fence(bo->resv, &release->base);
 458                 ttm_bo_add_to_lru(bo);
 459                 reservation_object_unlock(bo->resv);
 460         }
 461         spin_unlock(&glob->lru_lock);
 462         ww_acquire_fini(&release->ticket);
 463 }
 464