drivers/gpu/drm/drm_syncobj.c

   1 /*
   2  * Copyright 2017 Red Hat
   3  * Parts ported from amdgpu (fence wait code).
   4  * Copyright 2016 Advanced Micro Devices, Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  23  * IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *
  27  */
  28
  29 /**
  30  * DOC: Overview
  31  *
  32  * DRM synchronisation objects (syncobj) are a persistent objects,
  33  * that contain an optional fence. The fence can be updated with a new
  34  * fence, or be NULL.
  35  *
  36  * syncobj's can be waited upon, where it will wait for the underlying
  37  * fence.
  38  *
  39  * syncobj's can be export to fd's and back, these fd's are opaque and
  40  * have no other use case, except passing the syncobj between processes.
  41  *
  42  * Their primary use-case is to implement Vulkan fences and semaphores.
  43  *
  44  * syncobj have a kref reference count, but also have an optional file.
  45  * The file is only created once the syncobj is exported.
  46  * The file takes a reference on the kref.
  47  */
  48
  49 #include <drm/drmP.h>
  50 #include <linux/file.h>
  51 #include <linux/fs.h>
  52 #include <linux/anon_inodes.h>
  53 #include <linux/sync_file.h>
  54 #include <linux/sched/signal.h>
  55
  56 #include "drm_internal.h"
  57 #include <drm/drm_syncobj.h>
  58
  59 /**
  60  * drm_syncobj_find - lookup and reference a sync object.
  61  * @file_private: drm file private pointer
  62  * @handle: sync object handle to lookup.
  63  *
  64  * Returns a reference to the syncobj pointed to by handle or NULL.
  65  */
  66 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
  67                                      u32 handle)
  68 {
  69         struct drm_syncobj *syncobj;
  70
  71         spin_lock(&file_private->syncobj_table_lock);
  72
  73         /* Check if we currently have a reference on the object */
  74         syncobj = idr_find(&file_private->syncobj_idr, handle);
  75         if (syncobj)
  76                 drm_syncobj_get(syncobj);
  77
  78         spin_unlock(&file_private->syncobj_table_lock);
  79
  80         return syncobj;
  81 }
  82 EXPORT_SYMBOL(drm_syncobj_find);
  83
  84 static void drm_syncobj_add_callback_locked(struct drm_syncobj *syncobj,
  85                                             struct drm_syncobj_cb *cb,
  86                                             drm_syncobj_func_t func)
  87 {
  88         cb->func = func;
  89         list_add_tail(&cb->node, &syncobj->cb_list);
  90 }
  91
  92 static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
  93                                                  struct dma_fence **fence,
  94                                                  struct drm_syncobj_cb *cb,
  95                                                  drm_syncobj_func_t func)
  96 {
  97         int ret;
  98
  99         *fence = drm_syncobj_fence_get(syncobj);
 100         if (*fence)
 101                 return 1;
 102
 103         spin_lock(&syncobj->lock);
 104         /* We've already tried once to get a fence and failed.  Now that we
 105          * have the lock, try one more time just to be sure we don't add a
 106          * callback when a fence has already been set.
 107          */
 108         if (syncobj->fence) {
 109                 *fence = dma_fence_get(syncobj->fence);
 110                 ret = 1;
 111         } else {
 112                 *fence = NULL;
 113                 drm_syncobj_add_callback_locked(syncobj, cb, func);
 114                 ret = 0;
 115         }
 116         spin_unlock(&syncobj->lock);
 117
 118         return ret;
 119 }
 120
 121 /**
 122  * drm_syncobj_add_callback - adds a callback to syncobj::cb_list
 123  * @syncobj: Sync object to which to add the callback
 124  * @cb: Callback to add
 125  * @func: Func to use when initializing the drm_syncobj_cb struct
 126  *
 127  * This adds a callback to be called next time the fence is replaced
 128  */
 129 void drm_syncobj_add_callback(struct drm_syncobj *syncobj,
 130                               struct drm_syncobj_cb *cb,
 131                               drm_syncobj_func_t func)
 132 {
 133         spin_lock(&syncobj->lock);
 134         drm_syncobj_add_callback_locked(syncobj, cb, func);
 135         spin_unlock(&syncobj->lock);
 136 }
 137 EXPORT_SYMBOL(drm_syncobj_add_callback);
 138
 139 /**
 140  * drm_syncobj_add_callback - removes a callback to syncobj::cb_list
 141  * @syncobj: Sync object from which to remove the callback
 142  * @cb: Callback to remove
 143  */
 144 void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
 145                                  struct drm_syncobj_cb *cb)
 146 {
 147         spin_lock(&syncobj->lock);
 148         list_del_init(&cb->node);
 149         spin_unlock(&syncobj->lock);
 150 }
 151 EXPORT_SYMBOL(drm_syncobj_remove_callback);
 152
 153 /**
 154  * drm_syncobj_replace_fence - replace fence in a sync object.
 155  * @syncobj: Sync object to replace fence in
 156  * @fence: fence to install in sync file.
 157  *
 158  * This replaces the fence on a sync object.
 159  */
 160 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
 161                                struct dma_fence *fence)
 162 {
 163         struct dma_fence *old_fence;
 164         struct drm_syncobj_cb *cur, *tmp;
 165
 166         if (fence)
 167                 dma_fence_get(fence);
 168
 169         spin_lock(&syncobj->lock);
 170
 171         old_fence = syncobj->fence;
 172         syncobj->fence = fence;
 173
 174         if (fence != old_fence) {
 175                 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
 176                         list_del_init(&cur->node);
 177                         cur->func(syncobj, cur);
 178                 }
 179         }
 180
 181         spin_unlock(&syncobj->lock);
 182
 183         dma_fence_put(old_fence);
 184 }
 185 EXPORT_SYMBOL(drm_syncobj_replace_fence);
 186
 187 struct drm_syncobj_null_fence {
 188         struct dma_fence base;
 189         spinlock_t lock;
 190 };
 191
 192 static const char *drm_syncobj_null_fence_get_name(struct dma_fence *fence)
 193 {
 194         return "syncobjnull";
 195 }
 196
 197 static bool drm_syncobj_null_fence_enable_signaling(struct dma_fence *fence)
 198 {
 199     dma_fence_enable_sw_signaling(fence);
 200     return !dma_fence_is_signaled(fence);
 201 }
 202
 203 static const struct dma_fence_ops drm_syncobj_null_fence_ops = {
 204         .get_driver_name = drm_syncobj_null_fence_get_name,
 205         .get_timeline_name = drm_syncobj_null_fence_get_name,
 206         .enable_signaling = drm_syncobj_null_fence_enable_signaling,
 207         .wait = dma_fence_default_wait,
 208         .release = NULL,
 209 };
 210
 211 static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
 212 {
 213         struct drm_syncobj_null_fence *fence;
 214         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 215         if (fence == NULL)
 216                 return -ENOMEM;
 217
 218         spin_lock_init(&fence->lock);
 219         dma_fence_init(&fence->base, &drm_syncobj_null_fence_ops,
 220                        &fence->lock, 0, 0);
 221         dma_fence_signal(&fence->base);
 222
 223         drm_syncobj_replace_fence(syncobj, &fence->base);
 224
 225         dma_fence_put(&fence->base);
 226
 227         return 0;
 228 }
 229
 230 int drm_syncobj_find_fence(struct drm_file *file_private,
 231                            u32 handle,
 232                            struct dma_fence **fence)
 233 {
 234         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 235         int ret = 0;
 236
 237         if (!syncobj)
 238                 return -ENOENT;
 239
 240         *fence = drm_syncobj_fence_get(syncobj);
 241         if (!*fence) {
 242                 ret = -EINVAL;
 243         }
 244         drm_syncobj_put(syncobj);
 245         return ret;
 246 }
 247 EXPORT_SYMBOL(drm_syncobj_find_fence);
 248
 249 /**
 250  * drm_syncobj_free - free a sync object.
 251  * @kref: kref to free.
 252  *
 253  * Only to be called from kref_put in drm_syncobj_put.
 254  */
 255 void drm_syncobj_free(struct kref *kref)
 256 {
 257         struct drm_syncobj *syncobj = container_of(kref,
 258                                                    struct drm_syncobj,
 259                                                    refcount);
 260         drm_syncobj_replace_fence(syncobj, NULL);
 261         kfree(syncobj);
 262 }
 263 EXPORT_SYMBOL(drm_syncobj_free);
 264
 265 static int drm_syncobj_create(struct drm_file *file_private,
 266                               u32 *handle, uint32_t flags)
 267 {
 268         int ret;
 269         struct drm_syncobj *syncobj;
 270
 271         syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
 272         if (!syncobj)
 273                 return -ENOMEM;
 274
 275         kref_init(&syncobj->refcount);
 276         INIT_LIST_HEAD(&syncobj->cb_list);
 277         spin_lock_init(&syncobj->lock);
 278
 279         if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
 280                 ret = drm_syncobj_assign_null_handle(syncobj);
 281                 if (ret < 0) {
 282                         drm_syncobj_put(syncobj);
 283                         return ret;
 284                 }
 285         }
 286
 287         idr_preload(GFP_KERNEL);
 288         spin_lock(&file_private->syncobj_table_lock);
 289         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 290         spin_unlock(&file_private->syncobj_table_lock);
 291
 292         idr_preload_end();
 293
 294         if (ret < 0) {
 295                 drm_syncobj_put(syncobj);
 296                 return ret;
 297         }
 298
 299         *handle = ret;
 300         return 0;
 301 }
 302
 303 static int drm_syncobj_destroy(struct drm_file *file_private,
 304                                u32 handle)
 305 {
 306         struct drm_syncobj *syncobj;
 307
 308         spin_lock(&file_private->syncobj_table_lock);
 309         syncobj = idr_remove(&file_private->syncobj_idr, handle);
 310         spin_unlock(&file_private->syncobj_table_lock);
 311
 312         if (!syncobj)
 313                 return -EINVAL;
 314
 315         drm_syncobj_put(syncobj);
 316         return 0;
 317 }
 318
 319 static int drm_syncobj_file_release(struct inode *inode, struct file *file)
 320 {
 321         struct drm_syncobj *syncobj = file->private_data;
 322
 323         drm_syncobj_put(syncobj);
 324         return 0;
 325 }
 326
 327 static const struct file_operations drm_syncobj_file_fops = {
 328         .release = drm_syncobj_file_release,
 329 };
 330
 331 static int drm_syncobj_alloc_file(struct drm_syncobj *syncobj)
 332 {
 333         struct file *file = anon_inode_getfile("syncobj_file",
 334                                                &drm_syncobj_file_fops,
 335                                                syncobj, 0);
 336         if (IS_ERR(file))
 337                 return PTR_ERR(file);
 338
 339         drm_syncobj_get(syncobj);
 340         if (cmpxchg(&syncobj->file, NULL, file)) {
 341                 /* lost the race */
 342                 fput(file);
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
 349                                     u32 handle, int *p_fd)
 350 {
 351         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 352         int ret;
 353         int fd;
 354
 355         if (!syncobj)
 356                 return -EINVAL;
 357
 358         fd = get_unused_fd_flags(O_CLOEXEC);
 359         if (fd < 0) {
 360                 drm_syncobj_put(syncobj);
 361                 return fd;
 362         }
 363
 364         if (!syncobj->file) {
 365                 ret = drm_syncobj_alloc_file(syncobj);
 366                 if (ret)
 367                         goto out_put_fd;
 368         }
 369         fd_install(fd, syncobj->file);
 370         drm_syncobj_put(syncobj);
 371         *p_fd = fd;
 372         return 0;
 373 out_put_fd:
 374         put_unused_fd(fd);
 375         drm_syncobj_put(syncobj);
 376         return ret;
 377 }
 378
 379 static struct drm_syncobj *drm_syncobj_fdget(int fd)
 380 {
 381         struct file *file = fget(fd);
 382
 383         if (!file)
 384                 return NULL;
 385         if (file->f_op != &drm_syncobj_file_fops)
 386                 goto err;
 387
 388         return file->private_data;
 389 err:
 390         fput(file);
 391         return NULL;
 392 };
 393
 394 static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 395                                     int fd, u32 *handle)
 396 {
 397         struct drm_syncobj *syncobj = drm_syncobj_fdget(fd);
 398         int ret;
 399
 400         if (!syncobj)
 401                 return -EINVAL;
 402
 403         /* take a reference to put in the idr */
 404         drm_syncobj_get(syncobj);
 405
 406         idr_preload(GFP_KERNEL);
 407         spin_lock(&file_private->syncobj_table_lock);
 408         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 409         spin_unlock(&file_private->syncobj_table_lock);
 410         idr_preload_end();
 411
 412         if (ret < 0) {
 413                 fput(syncobj->file);
 414                 return ret;
 415         }
 416         *handle = ret;
 417         return 0;
 418 }
 419
 420 int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
 421                                        int fd, int handle)
 422 {
 423         struct dma_fence *fence = sync_file_get_fence(fd);
 424         struct drm_syncobj *syncobj;
 425
 426         if (!fence)
 427                 return -EINVAL;
 428
 429         syncobj = drm_syncobj_find(file_private, handle);
 430         if (!syncobj) {
 431                 dma_fence_put(fence);
 432                 return -ENOENT;
 433         }
 434
 435         drm_syncobj_replace_fence(syncobj, fence);
 436         dma_fence_put(fence);
 437         drm_syncobj_put(syncobj);
 438         return 0;
 439 }
 440
 441 int drm_syncobj_export_sync_file(struct drm_file *file_private,
 442                                  int handle, int *p_fd)
 443 {
 444         int ret;
 445         struct dma_fence *fence;
 446         struct sync_file *sync_file;
 447         int fd = get_unused_fd_flags(O_CLOEXEC);
 448
 449         if (fd < 0)
 450                 return fd;
 451
 452         ret = drm_syncobj_find_fence(file_private, handle, &fence);
 453         if (ret)
 454                 goto err_put_fd;
 455
 456         sync_file = sync_file_create(fence);
 457
 458         dma_fence_put(fence);
 459
 460         if (!sync_file) {
 461                 ret = -EINVAL;
 462                 goto err_put_fd;
 463         }
 464
 465         fd_install(fd, sync_file->file);
 466
 467         *p_fd = fd;
 468         return 0;
 469 err_put_fd:
 470         put_unused_fd(fd);
 471         return ret;
 472 }
 473 /**
 474  * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
 475  * @file_private: drm file-private structure to set up
 476  *
 477  * Called at device open time, sets up the structure for handling refcounting
 478  * of sync objects.
 479  */
 480 void
 481 drm_syncobj_open(struct drm_file *file_private)
 482 {
 483         idr_init(&file_private->syncobj_idr);
 484         spin_lock_init(&file_private->syncobj_table_lock);
 485 }
 486
 487 static int
 488 drm_syncobj_release_handle(int id, void *ptr, void *data)
 489 {
 490         struct drm_syncobj *syncobj = ptr;
 491
 492         drm_syncobj_put(syncobj);
 493         return 0;
 494 }
 495
 496 /**
 497  * drm_syncobj_release - release file-private sync object resources
 498  * @file_private: drm file-private structure to clean up
 499  *
 500  * Called at close time when the filp is going away.
 501  *
 502  * Releases any remaining references on objects by this filp.
 503  */
 504 void
 505 drm_syncobj_release(struct drm_file *file_private)
 506 {
 507         idr_for_each(&file_private->syncobj_idr,
 508                      &drm_syncobj_release_handle, file_private);
 509         idr_destroy(&file_private->syncobj_idr);
 510 }
 511
 512 int
 513 drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
 514                          struct drm_file *file_private)
 515 {
 516         struct drm_syncobj_create *args = data;
 517
 518         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 519                 return -ENODEV;
 520
 521         /* no valid flags yet */
 522         if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
 523                 return -EINVAL;
 524
 525         return drm_syncobj_create(file_private,
 526                                   &args->handle, args->flags);
 527 }
 528
 529 int
 530 drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
 531                           struct drm_file *file_private)
 532 {
 533         struct drm_syncobj_destroy *args = data;
 534
 535         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 536                 return -ENODEV;
 537
 538         /* make sure padding is empty */
 539         if (args->pad)
 540                 return -EINVAL;
 541         return drm_syncobj_destroy(file_private, args->handle);
 542 }
 543
 544 int
 545 drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 546                                    struct drm_file *file_private)
 547 {
 548         struct drm_syncobj_handle *args = data;
 549
 550         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 551                 return -ENODEV;
 552
 553         if (args->pad)
 554                 return -EINVAL;
 555
 556         if (args->flags != 0 &&
 557             args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 558                 return -EINVAL;
 559
 560         if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 561                 return drm_syncobj_export_sync_file(file_private, args->handle,
 562                                                     &args->fd);
 563
 564         return drm_syncobj_handle_to_fd(file_private, args->handle,
 565                                         &args->fd);
 566 }
 567
 568 int
 569 drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 570                                    struct drm_file *file_private)
 571 {
 572         struct drm_syncobj_handle *args = data;
 573
 574         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 575                 return -ENODEV;
 576
 577         if (args->pad)
 578                 return -EINVAL;
 579
 580         if (args->flags != 0 &&
 581             args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 582                 return -EINVAL;
 583
 584         if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 585                 return drm_syncobj_import_sync_file_fence(file_private,
 586                                                           args->fd,
 587                                                           args->handle);
 588
 589         return drm_syncobj_fd_to_handle(file_private, args->fd,
 590                                         &args->handle);
 591 }
 592
 593 struct syncobj_wait_entry {
 594         struct task_struct *task;
 595         struct dma_fence *fence;
 596         struct dma_fence_cb fence_cb;
 597         struct drm_syncobj_cb syncobj_cb;
 598 };
 599
 600 static void syncobj_wait_fence_func(struct dma_fence *fence,
 601                                     struct dma_fence_cb *cb)
 602 {
 603         struct syncobj_wait_entry *wait =
 604                 container_of(cb, struct syncobj_wait_entry, fence_cb);
 605
 606         wake_up_process(wait->task);
 607 }
 608
 609 static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
 610                                       struct drm_syncobj_cb *cb)
 611 {
 612         struct syncobj_wait_entry *wait =
 613                 container_of(cb, struct syncobj_wait_entry, syncobj_cb);
 614
 615         /* This happens inside the syncobj lock */
 616         wait->fence = dma_fence_get(syncobj->fence);
 617         wake_up_process(wait->task);
 618 }
 619
 620 static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 621                                                   uint32_t count,
 622                                                   uint32_t flags,
 623                                                   signed long timeout,
 624                                                   uint32_t *idx)
 625 {
 626         struct syncobj_wait_entry *entries;
 627         struct dma_fence *fence;
 628         signed long ret;
 629         uint32_t signaled_count, i;
 630
 631         entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
 632         if (!entries)
 633                 return -ENOMEM;
 634
 635         /* Walk the list of sync objects and initialize entries.  We do
 636          * this up-front so that we can properly return -EINVAL if there is
 637          * a syncobj with a missing fence and then never have the chance of
 638          * returning -EINVAL again.
 639          */
 640         signaled_count = 0;
 641         for (i = 0; i < count; ++i) {
 642                 entries[i].task = current;
 643                 entries[i].fence = drm_syncobj_fence_get(syncobjs[i]);
 644                 if (!entries[i].fence) {
 645                         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
 646                                 continue;
 647                         } else {
 648                                 ret = -EINVAL;
 649                                 goto cleanup_entries;
 650                         }
 651                 }
 652
 653                 if (dma_fence_is_signaled(entries[i].fence)) {
 654                         if (signaled_count == 0 && idx)
 655                                 *idx = i;
 656                         signaled_count++;
 657                 }
 658         }
 659
 660         /* Initialize ret to the max of timeout and 1.  That way, the
 661          * default return value indicates a successful wait and not a
 662          * timeout.
 663          */
 664         ret = max_t(signed long, timeout, 1);
 665
 666         if (signaled_count == count ||
 667             (signaled_count > 0 &&
 668              !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
 669                 goto cleanup_entries;
 670
 671         /* There's a very annoying laxness in the dma_fence API here, in
 672          * that backends are not required to automatically report when a
 673          * fence is signaled prior to fence->ops->enable_signaling() being
 674          * called.  So here if we fail to match signaled_count, we need to
 675          * fallthough and try a 0 timeout wait!
 676          */
 677
 678         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
 679                 for (i = 0; i < count; ++i) {
 680                         drm_syncobj_fence_get_or_add_callback(syncobjs[i],
 681                                                               &entries[i].fence,
 682                                                               &entries[i].syncobj_cb,
 683                                                               syncobj_wait_syncobj_func);
 684                 }
 685         }
 686
 687         do {
 688                 set_current_state(TASK_INTERRUPTIBLE);
 689
 690                 signaled_count = 0;
 691                 for (i = 0; i < count; ++i) {
 692                         fence = entries[i].fence;
 693                         if (!fence)
 694                                 continue;
 695
 696                         if (dma_fence_is_signaled(fence) ||
 697                             (!entries[i].fence_cb.func &&
 698                              dma_fence_add_callback(fence,
 699                                                     &entries[i].fence_cb,
 700                                                     syncobj_wait_fence_func))) {
 701                                 /* The fence has been signaled */
 702                                 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
 703                                         signaled_count++;
 704                                 } else {
 705                                         if (idx)
 706                                                 *idx = i;
 707                                         goto done_waiting;
 708                                 }
 709                         }
 710                 }
 711
 712                 if (signaled_count == count)
 713                         goto done_waiting;
 714
 715                 if (timeout == 0) {
 716                         /* If we are doing a 0 timeout wait and we got
 717                          * here, then we just timed out.
 718                          */
 719                         ret = 0;
 720                         goto done_waiting;
 721                 }
 722
 723                 ret = schedule_timeout(ret);
 724
 725                 if (ret > 0 && signal_pending(current))
 726                         ret = -ERESTARTSYS;
 727         } while (ret > 0);
 728
 729 done_waiting:
 730         __set_current_state(TASK_RUNNING);
 731
 732 cleanup_entries:
 733         for (i = 0; i < count; ++i) {
 734                 if (entries[i].syncobj_cb.func)
 735                         drm_syncobj_remove_callback(syncobjs[i],
 736                                                     &entries[i].syncobj_cb);
 737                 if (entries[i].fence_cb.func)
 738                         dma_fence_remove_callback(entries[i].fence,
 739                                                   &entries[i].fence_cb);
 740                 dma_fence_put(entries[i].fence);
 741         }
 742         kfree(entries);
 743
 744         return ret;
 745 }
 746
 747 /**
 748  * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
 749  *
 750  * @timeout_nsec: timeout nsec component in ns, 0 for poll
 751  *
 752  * Calculate the timeout in jiffies from an absolute time in sec/nsec.
 753  */
 754 static signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
 755 {
 756         ktime_t abs_timeout, now;
 757         u64 timeout_ns, timeout_jiffies64;
 758
 759         /* make 0 timeout means poll - absolute 0 doesn't seem valid */
 760         if (timeout_nsec == 0)
 761                 return 0;
 762
 763         abs_timeout = ns_to_ktime(timeout_nsec);
 764         now = ktime_get();
 765
 766         if (!ktime_after(abs_timeout, now))
 767                 return 0;
 768
 769         timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
 770
 771         timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
 772         /*  clamp timeout to avoid infinite timeout */
 773         if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
 774                 return MAX_SCHEDULE_TIMEOUT - 1;
 775
 776         return timeout_jiffies64 + 1;
 777 }
 778
 779 static int drm_syncobj_array_wait(struct drm_device *dev,
 780                                   struct drm_file *file_private,
 781                                   struct drm_syncobj_wait *wait,
 782                                   struct drm_syncobj **syncobjs)
 783 {
 784         signed long timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
 785         signed long ret = 0;
 786         uint32_t first = ~0;
 787
 788         ret = drm_syncobj_array_wait_timeout(syncobjs,
 789                                              wait->count_handles,
 790                                              wait->flags,
 791                                              timeout, &first);
 792         if (ret < 0)
 793                 return ret;
 794
 795         wait->first_signaled = first;
 796         if (ret == 0)
 797                 return -ETIME;
 798         return 0;
 799 }
 800
 801 int
 802 drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
 803                        struct drm_file *file_private)
 804 {
 805         struct drm_syncobj_wait *args = data;
 806         uint32_t *handles;
 807         struct drm_syncobj **syncobjs;
 808         int ret = 0;
 809         uint32_t i;
 810
 811         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 812                 return -ENODEV;
 813
 814         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
 815                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
 816                 return -EINVAL;
 817
 818         if (args->count_handles == 0)
 819                 return -EINVAL;
 820
 821         /* Get the handles from userspace */
 822         handles = kmalloc_array(args->count_handles, sizeof(uint32_t),
 823                                 GFP_KERNEL);
 824         if (handles == NULL)
 825                 return -ENOMEM;
 826
 827         if (copy_from_user(handles,
 828                            u64_to_user_ptr(args->handles),
 829                            sizeof(uint32_t) * args->count_handles)) {
 830                 ret = -EFAULT;
 831                 goto err_free_handles;
 832         }
 833
 834         syncobjs = kcalloc(args->count_handles,
 835                            sizeof(struct drm_syncobj *), GFP_KERNEL);
 836         if (!syncobjs) {
 837                 ret = -ENOMEM;
 838                 goto err_free_handles;
 839         }
 840
 841         for (i = 0; i < args->count_handles; i++) {
 842                 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
 843                 if (!syncobjs[i]) {
 844                         ret = -ENOENT;
 845                         goto err_free_fence_array;
 846                 }
 847         }
 848
 849         ret = drm_syncobj_array_wait(dev, file_private,
 850                                      args, syncobjs);
 851
 852 err_free_fence_array:
 853         while (i-- > 0)
 854                 drm_syncobj_put(syncobjs[i]);
 855         kfree(syncobjs);
 856 err_free_handles:
 857         kfree(handles);
 858
 859         return ret;
 860 }