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, see struct &drm_syncobj) provide a
  33  * container for a synchronization primitive which can be used by userspace
  34  * to explicitly synchronize GPU commands, can be shared between userspace
  35  * processes, and can be shared between different DRM drivers.
  36  * Their primary use-case is to implement Vulkan fences and semaphores.
  37  * The syncobj userspace API provides ioctls for several operations:
  38  *
  39  *  - Creation and destruction of syncobjs
  40  *  - Import and export of syncobjs to/from a syncobj file descriptor
  41  *  - Import and export a syncobj's underlying fence to/from a sync file
  42  *  - Reset a syncobj (set its fence to NULL)
  43  *  - Signal a syncobj (set a trivially signaled fence)
  44  *  - Wait for a syncobj's fence to appear and be signaled
  45  *
  46  * The syncobj userspace API also provides operations to manipulate a syncobj
  47  * in terms of a timeline of struct &dma_fence_chain rather than a single
  48  * struct &dma_fence, through the following operations:
  49  *
  50  *   - Signal a given point on the timeline
  51  *   - Wait for a given point to appear and/or be signaled
  52  *   - Import and export from/to a given point of a timeline
  53  *
  54  * At it's core, a syncobj is simply a wrapper around a pointer to a struct
  55  * &dma_fence which may be NULL.
  56  * When a syncobj is first created, its pointer is either NULL or a pointer
  57  * to an already signaled fence depending on whether the
  58  * &DRM_SYNCOBJ_CREATE_SIGNALED flag is passed to
  59  * &DRM_IOCTL_SYNCOBJ_CREATE.
  60  *
  61  * If the syncobj is considered as a binary (its state is either signaled or
  62  * unsignaled) primitive, when GPU work is enqueued in a DRM driver to signal
  63  * the syncobj, the syncobj's fence is replaced with a fence which will be
  64  * signaled by the completion of that work.
  65  * If the syncobj is considered as a timeline primitive, when GPU work is
  66  * enqueued in a DRM driver to signal the a given point of the syncobj, a new
  67  * struct &dma_fence_chain pointing to the DRM driver's fence and also
  68  * pointing to the previous fence that was in the syncobj. The new struct
  69  * &dma_fence_chain fence replace the syncobj's fence and will be signaled by
  70  * completion of the DRM driver's work and also any work associated with the
  71  * fence previously in the syncobj.
  72  *
  73  * When GPU work which waits on a syncobj is enqueued in a DRM driver, at the
  74  * time the work is enqueued, it waits on the syncobj's fence before
  75  * submitting the work to hardware. That fence is either :
  76  *
  77  *    - The syncobj's current fence if the syncobj is considered as a binary
  78  *      primitive.
  79  *    - The struct &dma_fence associated with a given point if the syncobj is
  80  *      considered as a timeline primitive.
  81  *
  82  * If the syncobj's fence is NULL or not present in the syncobj's timeline,
  83  * the enqueue operation is expected to fail.
  84  *
  85  * With binary syncobj, all manipulation of the syncobjs's fence happens in
  86  * terms of the current fence at the time the ioctl is called by userspace
  87  * regardless of whether that operation is an immediate host-side operation
  88  * (signal or reset) or or an operation which is enqueued in some driver
  89  * queue. &DRM_IOCTL_SYNCOBJ_RESET and &DRM_IOCTL_SYNCOBJ_SIGNAL can be used
  90  * to manipulate a syncobj from the host by resetting its pointer to NULL or
  91  * setting its pointer to a fence which is already signaled.
  92  *
  93  * With a timeline syncobj, all manipulation of the synobj's fence happens in
  94  * terms of a u64 value referring to point in the timeline. See
  95  * dma_fence_chain_find_seqno() to see how a given point is found in the
  96  * timeline.
  97  *
  98  * Note that applications should be careful to always use timeline set of
  99  * ioctl() when dealing with syncobj considered as timeline. Using a binary
 100  * set of ioctl() with a syncobj considered as timeline could result incorrect
 101  * synchronization. The use of binary syncobj is supported through the
 102  * timeline set of ioctl() by using a point value of 0, this will reproduce
 103  * the behavior of the binary set of ioctl() (for example replace the
 104  * syncobj's fence when signaling).
 105  *
 106  *
 107  * Host-side wait on syncobjs
 108  * --------------------------
 109  *
 110  * &DRM_IOCTL_SYNCOBJ_WAIT takes an array of syncobj handles and does a
 111  * host-side wait on all of the syncobj fences simultaneously.
 112  * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL is set, the wait ioctl will wait on
 113  * all of the syncobj fences to be signaled before it returns.
 114  * Otherwise, it returns once at least one syncobj fence has been signaled
 115  * and the index of a signaled fence is written back to the client.
 116  *
 117  * Unlike the enqueued GPU work dependencies which fail if they see a NULL
 118  * fence in a syncobj, if &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is set,
 119  * the host-side wait will first wait for the syncobj to receive a non-NULL
 120  * fence and then wait on that fence.
 121  * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is not set and any one of the
 122  * syncobjs in the array has a NULL fence, -EINVAL will be returned.
 123  * Assuming the syncobj starts off with a NULL fence, this allows a client
 124  * to do a host wait in one thread (or process) which waits on GPU work
 125  * submitted in another thread (or process) without having to manually
 126  * synchronize between the two.
 127  * This requirement is inherited from the Vulkan fence API.
 128  *
 129  * Similarly, &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT takes an array of syncobj
 130  * handles as well as an array of u64 points and does a host-side wait on all
 131  * of syncobj fences at the given points simultaneously.
 132  *
 133  * &DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT also adds the ability to wait for a given
 134  * fence to materialize on the timeline without waiting for the fence to be
 135  * signaled by using the &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE flag. This
 136  * requirement is inherited from the wait-before-signal behavior required by
 137  * the Vulkan timeline semaphore API.
 138  *
 139  *
 140  * Import/export of syncobjs
 141  * -------------------------
 142  *
 143  * &DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE and &DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD
 144  * provide two mechanisms for import/export of syncobjs.
 145  *
 146  * The first lets the client import or export an entire syncobj to a file
 147  * descriptor.
 148  * These fd's are opaque and have no other use case, except passing the
 149  * syncobj between processes.
 150  * All exported file descriptors and any syncobj handles created as a
 151  * result of importing those file descriptors own a reference to the
 152  * same underlying struct &drm_syncobj and the syncobj can be used
 153  * persistently across all the processes with which it is shared.
 154  * The syncobj is freed only once the last reference is dropped.
 155  * Unlike dma-buf, importing a syncobj creates a new handle (with its own
 156  * reference) for every import instead of de-duplicating.
 157  * The primary use-case of this persistent import/export is for shared
 158  * Vulkan fences and semaphores.
 159  *
 160  * The second import/export mechanism, which is indicated by
 161  * &DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE or
 162  * &DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE lets the client
 163  * import/export the syncobj's current fence from/to a &sync_file.
 164  * When a syncobj is exported to a sync file, that sync file wraps the
 165  * sycnobj's fence at the time of export and any later signal or reset
 166  * operations on the syncobj will not affect the exported sync file.
 167  * When a sync file is imported into a syncobj, the syncobj's fence is set
 168  * to the fence wrapped by that sync file.
 169  * Because sync files are immutable, resetting or signaling the syncobj
 170  * will not affect any sync files whose fences have been imported into the
 171  * syncobj.
 172  *
 173  *
 174  * Import/export of timeline points in timeline syncobjs
 175  * -----------------------------------------------------
 176  *
 177  * &DRM_IOCTL_SYNCOBJ_TRANSFER provides a mechanism to transfer a struct
 178  * &dma_fence_chain of a syncobj at a given u64 point to another u64 point
 179  * into another syncobj.
 180  *
 181  * Note that if you want to transfer a struct &dma_fence_chain from a given
 182  * point on a timeline syncobj from/into a binary syncobj, you can use the
 183  * point 0 to mean take/replace the fence in the syncobj.
 184  */
 185
 186 #include <linux/anon_inodes.h>
 187 #include <linux/file.h>
 188 #include <linux/fs.h>
 189 #include <linux/sched/signal.h>
 190 #include <linux/sync_file.h>
 191 #include <linux/uaccess.h>
 192
 193 #include <drm/drm.h>
 194 #include <drm/drm_drv.h>
 195 #include <drm/drm_file.h>
 196 #include <drm/drm_gem.h>
 197 #include <drm/drm_print.h>
 198 #include <drm/drm_syncobj.h>
 199 #include <drm/drm_utils.h>
 200
 201 #include "drm_internal.h"
 202
 203 struct syncobj_wait_entry {
 204         struct list_head node;
 205         struct task_struct *task;
 206         struct dma_fence *fence;
 207         struct dma_fence_cb fence_cb;
 208         u64    point;
 209 };
 210
 211 static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
 212                                       struct syncobj_wait_entry *wait);
 213
 214 /**
 215  * drm_syncobj_find - lookup and reference a sync object.
 216  * @file_private: drm file private pointer
 217  * @handle: sync object handle to lookup.
 218  *
 219  * Returns a reference to the syncobj pointed to by handle or NULL. The
 220  * reference must be released by calling drm_syncobj_put().
 221  */
 222 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
 223                                      u32 handle)
 224 {
 225         struct drm_syncobj *syncobj;
 226
 227         spin_lock(&file_private->syncobj_table_lock);
 228
 229         /* Check if we currently have a reference on the object */
 230         syncobj = idr_find(&file_private->syncobj_idr, handle);
 231         if (syncobj)
 232                 drm_syncobj_get(syncobj);
 233
 234         spin_unlock(&file_private->syncobj_table_lock);
 235
 236         return syncobj;
 237 }
 238 EXPORT_SYMBOL(drm_syncobj_find);
 239
 240 static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj,
 241                                        struct syncobj_wait_entry *wait)
 242 {
 243         struct dma_fence *fence;
 244
 245         if (wait->fence)
 246                 return;
 247
 248         spin_lock(&syncobj->lock);
 249         /* We've already tried once to get a fence and failed.  Now that we
 250          * have the lock, try one more time just to be sure we don't add a
 251          * callback when a fence has already been set.
 252          */
 253         fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, 1));
 254         if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
 255                 dma_fence_put(fence);
 256                 list_add_tail(&wait->node, &syncobj->cb_list);
 257         } else if (!fence) {
 258                 wait->fence = dma_fence_get_stub();
 259         } else {
 260                 wait->fence = fence;
 261         }
 262         spin_unlock(&syncobj->lock);
 263 }
 264
 265 static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
 266                                     struct syncobj_wait_entry *wait)
 267 {
 268         if (!wait->node.next)
 269                 return;
 270
 271         spin_lock(&syncobj->lock);
 272         list_del_init(&wait->node);
 273         spin_unlock(&syncobj->lock);
 274 }
 275
 276 /**
 277  * drm_syncobj_add_point - add new timeline point to the syncobj
 278  * @syncobj: sync object to add timeline point do
 279  * @chain: chain node to use to add the point
 280  * @fence: fence to encapsulate in the chain node
 281  * @point: sequence number to use for the point
 282  *
 283  * Add the chain node as new timeline point to the syncobj.
 284  */
 285 void drm_syncobj_add_point(struct drm_syncobj *syncobj,
 286                            struct dma_fence_chain *chain,
 287                            struct dma_fence *fence,
 288                            uint64_t point)
 289 {
 290         struct syncobj_wait_entry *cur, *tmp;
 291         struct dma_fence *prev;
 292
 293         dma_fence_get(fence);
 294
 295         spin_lock(&syncobj->lock);
 296
 297         prev = drm_syncobj_fence_get(syncobj);
 298         /* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */
 299         if (prev && prev->seqno >= point)
 300                 DRM_DEBUG("You are adding an unorder point to timeline!\n");
 301         dma_fence_chain_init(chain, prev, fence, point);
 302         rcu_assign_pointer(syncobj->fence, &chain->base);
 303
 304         list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
 305                 syncobj_wait_syncobj_func(syncobj, cur);
 306         spin_unlock(&syncobj->lock);
 307
 308         /* Walk the chain once to trigger garbage collection */
 309         dma_fence_chain_for_each(fence, prev);
 310         dma_fence_put(prev);
 311 }
 312 EXPORT_SYMBOL(drm_syncobj_add_point);
 313
 314 /**
 315  * drm_syncobj_replace_fence - replace fence in a sync object.
 316  * @syncobj: Sync object to replace fence in
 317  * @fence: fence to install in sync file.
 318  *
 319  * This replaces the fence on a sync object.
 320  */
 321 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
 322                                struct dma_fence *fence)
 323 {
 324         struct dma_fence *old_fence;
 325         struct syncobj_wait_entry *cur, *tmp;
 326
 327         if (fence)
 328                 dma_fence_get(fence);
 329
 330         spin_lock(&syncobj->lock);
 331
 332         old_fence = rcu_dereference_protected(syncobj->fence,
 333                                               lockdep_is_held(&syncobj->lock));
 334         rcu_assign_pointer(syncobj->fence, fence);
 335
 336         if (fence != old_fence) {
 337                 list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node)
 338                         syncobj_wait_syncobj_func(syncobj, cur);
 339         }
 340
 341         spin_unlock(&syncobj->lock);
 342
 343         dma_fence_put(old_fence);
 344 }
 345 EXPORT_SYMBOL(drm_syncobj_replace_fence);
 346
 347 /**
 348  * drm_syncobj_assign_null_handle - assign a stub fence to the sync object
 349  * @syncobj: sync object to assign the fence on
 350  *
 351  * Assign a already signaled stub fence to the sync object.
 352  */
 353 static void drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
 354 {
 355         struct dma_fence *fence = dma_fence_get_stub();
 356
 357         drm_syncobj_replace_fence(syncobj, fence);
 358         dma_fence_put(fence);
 359 }
 360
 361 /* 5s default for wait submission */
 362 #define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL
 363 /**
 364  * drm_syncobj_find_fence - lookup and reference the fence in a sync object
 365  * @file_private: drm file private pointer
 366  * @handle: sync object handle to lookup.
 367  * @point: timeline point
 368  * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not
 369  * @fence: out parameter for the fence
 370  *
 371  * This is just a convenience function that combines drm_syncobj_find() and
 372  * drm_syncobj_fence_get().
 373  *
 374  * Returns 0 on success or a negative error value on failure. On success @fence
 375  * contains a reference to the fence, which must be released by calling
 376  * dma_fence_put().
 377  */
 378 int drm_syncobj_find_fence(struct drm_file *file_private,
 379                            u32 handle, u64 point, u64 flags,
 380                            struct dma_fence **fence)
 381 {
 382         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 383         struct syncobj_wait_entry wait;
 384         u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
 385         int ret;
 386
 387         if (!syncobj)
 388                 return -ENOENT;
 389
 390         *fence = drm_syncobj_fence_get(syncobj);
 391         drm_syncobj_put(syncobj);
 392
 393         if (*fence) {
 394                 ret = dma_fence_chain_find_seqno(fence, point);
 395                 if (!ret)
 396                         return 0;
 397                 dma_fence_put(*fence);
 398         } else {
 399                 ret = -EINVAL;
 400         }
 401
 402         if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
 403                 return ret;
 404
 405         memset(&wait, 0, sizeof(wait));
 406         wait.task = current;
 407         wait.point = point;
 408         drm_syncobj_fence_add_wait(syncobj, &wait);
 409
 410         do {
 411                 set_current_state(TASK_INTERRUPTIBLE);
 412                 if (wait.fence) {
 413                         ret = 0;
 414                         break;
 415                 }
 416                 if (timeout == 0) {
 417                         ret = -ETIME;
 418                         break;
 419                 }
 420
 421                 if (signal_pending(current)) {
 422                         ret = -ERESTARTSYS;
 423                         break;
 424                 }
 425
 426                 timeout = schedule_timeout(timeout);
 427         } while (1);
 428
 429         __set_current_state(TASK_RUNNING);
 430         *fence = wait.fence;
 431
 432         if (wait.node.next)
 433                 drm_syncobj_remove_wait(syncobj, &wait);
 434
 435         return ret;
 436 }
 437 EXPORT_SYMBOL(drm_syncobj_find_fence);
 438
 439 /**
 440  * drm_syncobj_free - free a sync object.
 441  * @kref: kref to free.
 442  *
 443  * Only to be called from kref_put in drm_syncobj_put.
 444  */
 445 void drm_syncobj_free(struct kref *kref)
 446 {
 447         struct drm_syncobj *syncobj = container_of(kref,
 448                                                    struct drm_syncobj,
 449                                                    refcount);
 450         drm_syncobj_replace_fence(syncobj, NULL);
 451         kfree(syncobj);
 452 }
 453 EXPORT_SYMBOL(drm_syncobj_free);
 454
 455 /**
 456  * drm_syncobj_create - create a new syncobj
 457  * @out_syncobj: returned syncobj
 458  * @flags: DRM_SYNCOBJ_* flags
 459  * @fence: if non-NULL, the syncobj will represent this fence
 460  *
 461  * This is the first function to create a sync object. After creating, drivers
 462  * probably want to make it available to userspace, either through
 463  * drm_syncobj_get_handle() or drm_syncobj_get_fd().
 464  *
 465  * Returns 0 on success or a negative error value on failure.
 466  */
 467 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 468                        struct dma_fence *fence)
 469 {
 470         struct drm_syncobj *syncobj;
 471
 472         syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
 473         if (!syncobj)
 474                 return -ENOMEM;
 475
 476         kref_init(&syncobj->refcount);
 477         INIT_LIST_HEAD(&syncobj->cb_list);
 478         spin_lock_init(&syncobj->lock);
 479
 480         if (flags & DRM_SYNCOBJ_CREATE_SIGNALED)
 481                 drm_syncobj_assign_null_handle(syncobj);
 482
 483         if (fence)
 484                 drm_syncobj_replace_fence(syncobj, fence);
 485
 486         *out_syncobj = syncobj;
 487         return 0;
 488 }
 489 EXPORT_SYMBOL(drm_syncobj_create);
 490
 491 /**
 492  * drm_syncobj_get_handle - get a handle from a syncobj
 493  * @file_private: drm file private pointer
 494  * @syncobj: Sync object to export
 495  * @handle: out parameter with the new handle
 496  *
 497  * Exports a sync object created with drm_syncobj_create() as a handle on
 498  * @file_private to userspace.
 499  *
 500  * Returns 0 on success or a negative error value on failure.
 501  */
 502 int drm_syncobj_get_handle(struct drm_file *file_private,
 503                            struct drm_syncobj *syncobj, u32 *handle)
 504 {
 505         int ret;
 506
 507         /* take a reference to put in the idr */
 508         drm_syncobj_get(syncobj);
 509
 510         idr_preload(GFP_KERNEL);
 511         spin_lock(&file_private->syncobj_table_lock);
 512         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 513         spin_unlock(&file_private->syncobj_table_lock);
 514
 515         idr_preload_end();
 516
 517         if (ret < 0) {
 518                 drm_syncobj_put(syncobj);
 519                 return ret;
 520         }
 521
 522         *handle = ret;
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(drm_syncobj_get_handle);
 526
 527 static int drm_syncobj_create_as_handle(struct drm_file *file_private,
 528                                         u32 *handle, uint32_t flags)
 529 {
 530         int ret;
 531         struct drm_syncobj *syncobj;
 532
 533         ret = drm_syncobj_create(&syncobj, flags, NULL);
 534         if (ret)
 535                 return ret;
 536
 537         ret = drm_syncobj_get_handle(file_private, syncobj, handle);
 538         drm_syncobj_put(syncobj);
 539         return ret;
 540 }
 541
 542 static int drm_syncobj_destroy(struct drm_file *file_private,
 543                                u32 handle)
 544 {
 545         struct drm_syncobj *syncobj;
 546
 547         spin_lock(&file_private->syncobj_table_lock);
 548         syncobj = idr_remove(&file_private->syncobj_idr, handle);
 549         spin_unlock(&file_private->syncobj_table_lock);
 550
 551         if (!syncobj)
 552                 return -EINVAL;
 553
 554         drm_syncobj_put(syncobj);
 555         return 0;
 556 }
 557
 558 static int drm_syncobj_file_release(struct inode *inode, struct file *file)
 559 {
 560         struct drm_syncobj *syncobj = file->private_data;
 561
 562         drm_syncobj_put(syncobj);
 563         return 0;
 564 }
 565
 566 static const struct file_operations drm_syncobj_file_fops = {
 567         .release = drm_syncobj_file_release,
 568 };
 569
 570 /**
 571  * drm_syncobj_get_fd - get a file descriptor from a syncobj
 572  * @syncobj: Sync object to export
 573  * @p_fd: out parameter with the new file descriptor
 574  *
 575  * Exports a sync object created with drm_syncobj_create() as a file descriptor.
 576  *
 577  * Returns 0 on success or a negative error value on failure.
 578  */
 579 int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
 580 {
 581         struct file *file;
 582         int fd;
 583
 584         fd = get_unused_fd_flags(O_CLOEXEC);
 585         if (fd < 0)
 586                 return fd;
 587
 588         file = anon_inode_getfile("syncobj_file",
 589                                   &drm_syncobj_file_fops,
 590                                   syncobj, 0);
 591         if (IS_ERR(file)) {
 592                 put_unused_fd(fd);
 593                 return PTR_ERR(file);
 594         }
 595
 596         drm_syncobj_get(syncobj);
 597         fd_install(fd, file);
 598
 599         *p_fd = fd;
 600         return 0;
 601 }
 602 EXPORT_SYMBOL(drm_syncobj_get_fd);
 603
 604 static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
 605                                     u32 handle, int *p_fd)
 606 {
 607         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 608         int ret;
 609
 610         if (!syncobj)
 611                 return -EINVAL;
 612
 613         ret = drm_syncobj_get_fd(syncobj, p_fd);
 614         drm_syncobj_put(syncobj);
 615         return ret;
 616 }
 617
 618 static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 619                                     int fd, u32 *handle)
 620 {
 621         struct drm_syncobj *syncobj;
 622         struct fd f = fdget(fd);
 623         int ret;
 624
 625         if (!f.file)
 626                 return -EINVAL;
 627
 628         if (f.file->f_op != &drm_syncobj_file_fops) {
 629                 fdput(f);
 630                 return -EINVAL;
 631         }
 632
 633         /* take a reference to put in the idr */
 634         syncobj = f.file->private_data;
 635         drm_syncobj_get(syncobj);
 636
 637         idr_preload(GFP_KERNEL);
 638         spin_lock(&file_private->syncobj_table_lock);
 639         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 640         spin_unlock(&file_private->syncobj_table_lock);
 641         idr_preload_end();
 642
 643         if (ret > 0) {
 644                 *handle = ret;
 645                 ret = 0;
 646         } else
 647                 drm_syncobj_put(syncobj);
 648
 649         fdput(f);
 650         return ret;
 651 }
 652
 653 static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
 654                                               int fd, int handle)
 655 {
 656         struct dma_fence *fence = sync_file_get_fence(fd);
 657         struct drm_syncobj *syncobj;
 658
 659         if (!fence)
 660                 return -EINVAL;
 661
 662         syncobj = drm_syncobj_find(file_private, handle);
 663         if (!syncobj) {
 664                 dma_fence_put(fence);
 665                 return -ENOENT;
 666         }
 667
 668         drm_syncobj_replace_fence(syncobj, fence);
 669         dma_fence_put(fence);
 670         drm_syncobj_put(syncobj);
 671         return 0;
 672 }
 673
 674 static int drm_syncobj_export_sync_file(struct drm_file *file_private,
 675                                         int handle, int *p_fd)
 676 {
 677         int ret;
 678         struct dma_fence *fence;
 679         struct sync_file *sync_file;
 680         int fd = get_unused_fd_flags(O_CLOEXEC);
 681
 682         if (fd < 0)
 683                 return fd;
 684
 685         ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
 686         if (ret)
 687                 goto err_put_fd;
 688
 689         sync_file = sync_file_create(fence);
 690
 691         dma_fence_put(fence);
 692
 693         if (!sync_file) {
 694                 ret = -EINVAL;
 695                 goto err_put_fd;
 696         }
 697
 698         fd_install(fd, sync_file->file);
 699
 700         *p_fd = fd;
 701         return 0;
 702 err_put_fd:
 703         put_unused_fd(fd);
 704         return ret;
 705 }
 706 /**
 707  * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
 708  * @file_private: drm file-private structure to set up
 709  *
 710  * Called at device open time, sets up the structure for handling refcounting
 711  * of sync objects.
 712  */
 713 void
 714 drm_syncobj_open(struct drm_file *file_private)
 715 {
 716         idr_init_base(&file_private->syncobj_idr, 1);
 717         spin_lock_init(&file_private->syncobj_table_lock);
 718 }
 719
 720 static int
 721 drm_syncobj_release_handle(int id, void *ptr, void *data)
 722 {
 723         struct drm_syncobj *syncobj = ptr;
 724
 725         drm_syncobj_put(syncobj);
 726         return 0;
 727 }
 728
 729 /**
 730  * drm_syncobj_release - release file-private sync object resources
 731  * @file_private: drm file-private structure to clean up
 732  *
 733  * Called at close time when the filp is going away.
 734  *
 735  * Releases any remaining references on objects by this filp.
 736  */
 737 void
 738 drm_syncobj_release(struct drm_file *file_private)
 739 {
 740         idr_for_each(&file_private->syncobj_idr,
 741                      &drm_syncobj_release_handle, file_private);
 742         idr_destroy(&file_private->syncobj_idr);
 743 }
 744
 745 int
 746 drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
 747                          struct drm_file *file_private)
 748 {
 749         struct drm_syncobj_create *args = data;
 750
 751         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 752                 return -EOPNOTSUPP;
 753
 754         /* no valid flags yet */
 755         if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
 756                 return -EINVAL;
 757
 758         return drm_syncobj_create_as_handle(file_private,
 759                                             &args->handle, args->flags);
 760 }
 761
 762 int
 763 drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
 764                           struct drm_file *file_private)
 765 {
 766         struct drm_syncobj_destroy *args = data;
 767
 768         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 769                 return -EOPNOTSUPP;
 770
 771         /* make sure padding is empty */
 772         if (args->pad)
 773                 return -EINVAL;
 774         return drm_syncobj_destroy(file_private, args->handle);
 775 }
 776
 777 int
 778 drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 779                                    struct drm_file *file_private)
 780 {
 781         struct drm_syncobj_handle *args = data;
 782
 783         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 784                 return -EOPNOTSUPP;
 785
 786         if (args->pad)
 787                 return -EINVAL;
 788
 789         if (args->flags != 0 &&
 790             args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 791                 return -EINVAL;
 792
 793         if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 794                 return drm_syncobj_export_sync_file(file_private, args->handle,
 795                                                     &args->fd);
 796
 797         return drm_syncobj_handle_to_fd(file_private, args->handle,
 798                                         &args->fd);
 799 }
 800
 801 int
 802 drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 803                                    struct drm_file *file_private)
 804 {
 805         struct drm_syncobj_handle *args = data;
 806
 807         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 808                 return -EOPNOTSUPP;
 809
 810         if (args->pad)
 811                 return -EINVAL;
 812
 813         if (args->flags != 0 &&
 814             args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 815                 return -EINVAL;
 816
 817         if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 818                 return drm_syncobj_import_sync_file_fence(file_private,
 819                                                           args->fd,
 820                                                           args->handle);
 821
 822         return drm_syncobj_fd_to_handle(file_private, args->fd,
 823                                         &args->handle);
 824 }
 825
 826 static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 827                                             struct drm_syncobj_transfer *args)
 828 {
 829         struct drm_syncobj *timeline_syncobj = NULL;
 830         struct dma_fence *fence;
 831         struct dma_fence_chain *chain;
 832         int ret;
 833
 834         timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 835         if (!timeline_syncobj) {
 836                 return -ENOENT;
 837         }
 838         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 839                                      args->src_point, args->flags,
 840                                      &fence);
 841         if (ret)
 842                 goto err;
 843         chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
 844         if (!chain) {
 845                 ret = -ENOMEM;
 846                 goto err1;
 847         }
 848         drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
 849 err1:
 850         dma_fence_put(fence);
 851 err:
 852         drm_syncobj_put(timeline_syncobj);
 853
 854         return ret;
 855 }
 856
 857 static int
 858 drm_syncobj_transfer_to_binary(struct drm_file *file_private,
 859                                struct drm_syncobj_transfer *args)
 860 {
 861         struct drm_syncobj *binary_syncobj = NULL;
 862         struct dma_fence *fence;
 863         int ret;
 864
 865         binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 866         if (!binary_syncobj)
 867                 return -ENOENT;
 868         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 869                                      args->src_point, args->flags, &fence);
 870         if (ret)
 871                 goto err;
 872         drm_syncobj_replace_fence(binary_syncobj, fence);
 873         dma_fence_put(fence);
 874 err:
 875         drm_syncobj_put(binary_syncobj);
 876
 877         return ret;
 878 }
 879 int
 880 drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
 881                            struct drm_file *file_private)
 882 {
 883         struct drm_syncobj_transfer *args = data;
 884         int ret;
 885
 886         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
 887                 return -EOPNOTSUPP;
 888
 889         if (args->pad)
 890                 return -EINVAL;
 891
 892         if (args->dst_point)
 893                 ret = drm_syncobj_transfer_to_timeline(file_private, args);
 894         else
 895                 ret = drm_syncobj_transfer_to_binary(file_private, args);
 896
 897         return ret;
 898 }
 899
 900 static void syncobj_wait_fence_func(struct dma_fence *fence,
 901                                     struct dma_fence_cb *cb)
 902 {
 903         struct syncobj_wait_entry *wait =
 904                 container_of(cb, struct syncobj_wait_entry, fence_cb);
 905
 906         wake_up_process(wait->task);
 907 }
 908
 909 static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
 910                                       struct syncobj_wait_entry *wait)
 911 {
 912         struct dma_fence *fence;
 913
 914         /* This happens inside the syncobj lock */
 915         fence = rcu_dereference_protected(syncobj->fence,
 916                                           lockdep_is_held(&syncobj->lock));
 917         dma_fence_get(fence);
 918         if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
 919                 dma_fence_put(fence);
 920                 return;
 921         } else if (!fence) {
 922                 wait->fence = dma_fence_get_stub();
 923         } else {
 924                 wait->fence = fence;
 925         }
 926
 927         wake_up_process(wait->task);
 928         list_del_init(&wait->node);
 929 }
 930
 931 static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 932                                                   void __user *user_points,
 933                                                   uint32_t count,
 934                                                   uint32_t flags,
 935                                                   signed long timeout,
 936                                                   uint32_t *idx)
 937 {
 938         struct syncobj_wait_entry *entries;
 939         struct dma_fence *fence;
 940         uint64_t *points;
 941         uint32_t signaled_count, i;
 942
 943         points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
 944         if (points == NULL)
 945                 return -ENOMEM;
 946
 947         if (!user_points) {
 948                 memset(points, 0, count * sizeof(uint64_t));
 949
 950         } else if (copy_from_user(points, user_points,
 951                                   sizeof(uint64_t) * count)) {
 952                 timeout = -EFAULT;
 953                 goto err_free_points;
 954         }
 955
 956         entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
 957         if (!entries) {
 958                 timeout = -ENOMEM;
 959                 goto err_free_points;
 960         }
 961         /* Walk the list of sync objects and initialize entries.  We do
 962          * this up-front so that we can properly return -EINVAL if there is
 963          * a syncobj with a missing fence and then never have the chance of
 964          * returning -EINVAL again.
 965          */
 966         signaled_count = 0;
 967         for (i = 0; i < count; ++i) {
 968                 struct dma_fence *fence;
 969
 970                 entries[i].task = current;
 971                 entries[i].point = points[i];
 972                 fence = drm_syncobj_fence_get(syncobjs[i]);
 973                 if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
 974                         dma_fence_put(fence);
 975                         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
 976                                 continue;
 977                         } else {
 978                                 timeout = -EINVAL;
 979                                 goto cleanup_entries;
 980                         }
 981                 }
 982
 983                 if (fence)
 984                         entries[i].fence = fence;
 985                 else
 986                         entries[i].fence = dma_fence_get_stub();
 987
 988                 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
 989                     dma_fence_is_signaled(entries[i].fence)) {
 990                         if (signaled_count == 0 && idx)
 991                                 *idx = i;
 992                         signaled_count++;
 993                 }
 994         }
 995
 996         if (signaled_count == count ||
 997             (signaled_count > 0 &&
 998              !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
 999                 goto cleanup_entries;
1000
1001         /* There's a very annoying laxness in the dma_fence API here, in
1002          * that backends are not required to automatically report when a
1003          * fence is signaled prior to fence->ops->enable_signaling() being
1004          * called.  So here if we fail to match signaled_count, we need to
1005          * fallthough and try a 0 timeout wait!
1006          */
1007
1008         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
1009                 for (i = 0; i < count; ++i)
1010                         drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
1011         }
1012
1013         do {
1014                 set_current_state(TASK_INTERRUPTIBLE);
1015
1016                 signaled_count = 0;
1017                 for (i = 0; i < count; ++i) {
1018                         fence = entries[i].fence;
1019                         if (!fence)
1020                                 continue;
1021
1022                         if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1023                             dma_fence_is_signaled(fence) ||
1024                             (!entries[i].fence_cb.func &&
1025                              dma_fence_add_callback(fence,
1026                                                     &entries[i].fence_cb,
1027                                                     syncobj_wait_fence_func))) {
1028                                 /* The fence has been signaled */
1029                                 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
1030                                         signaled_count++;
1031                                 } else {
1032                                         if (idx)
1033                                                 *idx = i;
1034                                         goto done_waiting;
1035                                 }
1036                         }
1037                 }
1038
1039                 if (signaled_count == count)
1040                         goto done_waiting;
1041
1042                 if (timeout == 0) {
1043                         timeout = -ETIME;
1044                         goto done_waiting;
1045                 }
1046
1047                 if (signal_pending(current)) {
1048                         timeout = -ERESTARTSYS;
1049                         goto done_waiting;
1050                 }
1051
1052                 timeout = schedule_timeout(timeout);
1053         } while (1);
1054
1055 done_waiting:
1056         __set_current_state(TASK_RUNNING);
1057
1058 cleanup_entries:
1059         for (i = 0; i < count; ++i) {
1060                 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
1061                 if (entries[i].fence_cb.func)
1062                         dma_fence_remove_callback(entries[i].fence,
1063                                                   &entries[i].fence_cb);
1064                 dma_fence_put(entries[i].fence);
1065         }
1066         kfree(entries);
1067
1068 err_free_points:
1069         kfree(points);
1070
1071         return timeout;
1072 }
1073
1074 /**
1075  * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
1076  *
1077  * @timeout_nsec: timeout nsec component in ns, 0 for poll
1078  *
1079  * Calculate the timeout in jiffies from an absolute time in sec/nsec.
1080  */
1081 signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
1082 {
1083         ktime_t abs_timeout, now;
1084         u64 timeout_ns, timeout_jiffies64;
1085
1086         /* make 0 timeout means poll - absolute 0 doesn't seem valid */
1087         if (timeout_nsec == 0)
1088                 return 0;
1089
1090         abs_timeout = ns_to_ktime(timeout_nsec);
1091         now = ktime_get();
1092
1093         if (!ktime_after(abs_timeout, now))
1094                 return 0;
1095
1096         timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
1097
1098         timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
1099         /*  clamp timeout to avoid infinite timeout */
1100         if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
1101                 return MAX_SCHEDULE_TIMEOUT - 1;
1102
1103         return timeout_jiffies64 + 1;
1104 }
1105 EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
1106
1107 static int drm_syncobj_array_wait(struct drm_device *dev,
1108                                   struct drm_file *file_private,
1109                                   struct drm_syncobj_wait *wait,
1110                                   struct drm_syncobj_timeline_wait *timeline_wait,
1111                                   struct drm_syncobj **syncobjs, bool timeline)
1112 {
1113         signed long timeout = 0;
1114         uint32_t first = ~0;
1115
1116         if (!timeline) {
1117                 timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
1118                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1119                                                          NULL,
1120                                                          wait->count_handles,
1121                                                          wait->flags,
1122                                                          timeout, &first);
1123                 if (timeout < 0)
1124                         return timeout;
1125                 wait->first_signaled = first;
1126         } else {
1127                 timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec);
1128                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1129                                                          u64_to_user_ptr(timeline_wait->points),
1130                                                          timeline_wait->count_handles,
1131                                                          timeline_wait->flags,
1132                                                          timeout, &first);
1133                 if (timeout < 0)
1134                         return timeout;
1135                 timeline_wait->first_signaled = first;
1136         }
1137         return 0;
1138 }
1139
1140 static int drm_syncobj_array_find(struct drm_file *file_private,
1141                                   void __user *user_handles,
1142                                   uint32_t count_handles,
1143                                   struct drm_syncobj ***syncobjs_out)
1144 {
1145         uint32_t i, *handles;
1146         struct drm_syncobj **syncobjs;
1147         int ret;
1148
1149         handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
1150         if (handles == NULL)
1151                 return -ENOMEM;
1152
1153         if (copy_from_user(handles, user_handles,
1154                            sizeof(uint32_t) * count_handles)) {
1155                 ret = -EFAULT;
1156                 goto err_free_handles;
1157         }
1158
1159         syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
1160         if (syncobjs == NULL) {
1161                 ret = -ENOMEM;
1162                 goto err_free_handles;
1163         }
1164
1165         for (i = 0; i < count_handles; i++) {
1166                 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
1167                 if (!syncobjs[i]) {
1168                         ret = -ENOENT;
1169                         goto err_put_syncobjs;
1170                 }
1171         }
1172
1173         kfree(handles);
1174         *syncobjs_out = syncobjs;
1175         return 0;
1176
1177 err_put_syncobjs:
1178         while (i-- > 0)
1179                 drm_syncobj_put(syncobjs[i]);
1180         kfree(syncobjs);
1181 err_free_handles:
1182         kfree(handles);
1183
1184         return ret;
1185 }
1186
1187 static void drm_syncobj_array_free(struct drm_syncobj **syncobjs,
1188                                    uint32_t count)
1189 {
1190         uint32_t i;
1191
1192         for (i = 0; i < count; i++)
1193                 drm_syncobj_put(syncobjs[i]);
1194         kfree(syncobjs);
1195 }
1196
1197 int
1198 drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1199                        struct drm_file *file_private)
1200 {
1201         struct drm_syncobj_wait *args = data;
1202         struct drm_syncobj **syncobjs;
1203         int ret = 0;
1204
1205         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1206                 return -EOPNOTSUPP;
1207
1208         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1209                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
1210                 return -EINVAL;
1211
1212         if (args->count_handles == 0)
1213                 return -EINVAL;
1214
1215         ret = drm_syncobj_array_find(file_private,
1216                                      u64_to_user_ptr(args->handles),
1217                                      args->count_handles,
1218                                      &syncobjs);
1219         if (ret < 0)
1220                 return ret;
1221
1222         ret = drm_syncobj_array_wait(dev, file_private,
1223                                      args, NULL, syncobjs, false);
1224
1225         drm_syncobj_array_free(syncobjs, args->count_handles);
1226
1227         return ret;
1228 }
1229
1230 int
1231 drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1232                                 struct drm_file *file_private)
1233 {
1234         struct drm_syncobj_timeline_wait *args = data;
1235         struct drm_syncobj **syncobjs;
1236         int ret = 0;
1237
1238         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1239                 return -EOPNOTSUPP;
1240
1241         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1242                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1243                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1244                 return -EINVAL;
1245
1246         if (args->count_handles == 0)
1247                 return -EINVAL;
1248
1249         ret = drm_syncobj_array_find(file_private,
1250                                      u64_to_user_ptr(args->handles),
1251                                      args->count_handles,
1252                                      &syncobjs);
1253         if (ret < 0)
1254                 return ret;
1255
1256         ret = drm_syncobj_array_wait(dev, file_private,
1257                                      NULL, args, syncobjs, true);
1258
1259         drm_syncobj_array_free(syncobjs, args->count_handles);
1260
1261         return ret;
1262 }
1263
1264
1265 int
1266 drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
1267                         struct drm_file *file_private)
1268 {
1269         struct drm_syncobj_array *args = data;
1270         struct drm_syncobj **syncobjs;
1271         uint32_t i;
1272         int ret;
1273
1274         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1275                 return -EOPNOTSUPP;
1276
1277         if (args->pad != 0)
1278                 return -EINVAL;
1279
1280         if (args->count_handles == 0)
1281                 return -EINVAL;
1282
1283         ret = drm_syncobj_array_find(file_private,
1284                                      u64_to_user_ptr(args->handles),
1285                                      args->count_handles,
1286                                      &syncobjs);
1287         if (ret < 0)
1288                 return ret;
1289
1290         for (i = 0; i < args->count_handles; i++)
1291                 drm_syncobj_replace_fence(syncobjs[i], NULL);
1292
1293         drm_syncobj_array_free(syncobjs, args->count_handles);
1294
1295         return 0;
1296 }
1297
1298 int
1299 drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1300                          struct drm_file *file_private)
1301 {
1302         struct drm_syncobj_array *args = data;
1303         struct drm_syncobj **syncobjs;
1304         uint32_t i;
1305         int ret;
1306
1307         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1308                 return -EOPNOTSUPP;
1309
1310         if (args->pad != 0)
1311                 return -EINVAL;
1312
1313         if (args->count_handles == 0)
1314                 return -EINVAL;
1315
1316         ret = drm_syncobj_array_find(file_private,
1317                                      u64_to_user_ptr(args->handles),
1318                                      args->count_handles,
1319                                      &syncobjs);
1320         if (ret < 0)
1321                 return ret;
1322
1323         for (i = 0; i < args->count_handles; i++)
1324                 drm_syncobj_assign_null_handle(syncobjs[i]);
1325
1326         drm_syncobj_array_free(syncobjs, args->count_handles);
1327
1328         return ret;
1329 }
1330
1331 int
1332 drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1333                                   struct drm_file *file_private)
1334 {
1335         struct drm_syncobj_timeline_array *args = data;
1336         struct drm_syncobj **syncobjs;
1337         struct dma_fence_chain **chains;
1338         uint64_t *points;
1339         uint32_t i, j;
1340         int ret;
1341
1342         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1343                 return -EOPNOTSUPP;
1344
1345         if (args->flags != 0)
1346                 return -EINVAL;
1347
1348         if (args->count_handles == 0)
1349                 return -EINVAL;
1350
1351         ret = drm_syncobj_array_find(file_private,
1352                                      u64_to_user_ptr(args->handles),
1353                                      args->count_handles,
1354                                      &syncobjs);
1355         if (ret < 0)
1356                 return ret;
1357
1358         points = kmalloc_array(args->count_handles, sizeof(*points),
1359                                GFP_KERNEL);
1360         if (!points) {
1361                 ret = -ENOMEM;
1362                 goto out;
1363         }
1364         if (!u64_to_user_ptr(args->points)) {
1365                 memset(points, 0, args->count_handles * sizeof(uint64_t));
1366         } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1367                                   sizeof(uint64_t) * args->count_handles)) {
1368                 ret = -EFAULT;
1369                 goto err_points;
1370         }
1371
1372         chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1373         if (!chains) {
1374                 ret = -ENOMEM;
1375                 goto err_points;
1376         }
1377         for (i = 0; i < args->count_handles; i++) {
1378                 chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
1379                 if (!chains[i]) {
1380                         for (j = 0; j < i; j++)
1381                                 kfree(chains[j]);
1382                         ret = -ENOMEM;
1383                         goto err_chains;
1384                 }
1385         }
1386
1387         for (i = 0; i < args->count_handles; i++) {
1388                 struct dma_fence *fence = dma_fence_get_stub();
1389
1390                 drm_syncobj_add_point(syncobjs[i], chains[i],
1391                                       fence, points[i]);
1392                 dma_fence_put(fence);
1393         }
1394 err_chains:
1395         kfree(chains);
1396 err_points:
1397         kfree(points);
1398 out:
1399         drm_syncobj_array_free(syncobjs, args->count_handles);
1400
1401         return ret;
1402 }
1403
1404 int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1405                             struct drm_file *file_private)
1406 {
1407         struct drm_syncobj_timeline_array *args = data;
1408         struct drm_syncobj **syncobjs;
1409         uint64_t __user *points = u64_to_user_ptr(args->points);
1410         uint32_t i;
1411         int ret;
1412
1413         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1414                 return -EOPNOTSUPP;
1415
1416         if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
1417                 return -EINVAL;
1418
1419         if (args->count_handles == 0)
1420                 return -EINVAL;
1421
1422         ret = drm_syncobj_array_find(file_private,
1423                                      u64_to_user_ptr(args->handles),
1424                                      args->count_handles,
1425                                      &syncobjs);
1426         if (ret < 0)
1427                 return ret;
1428
1429         for (i = 0; i < args->count_handles; i++) {
1430                 struct dma_fence_chain *chain;
1431                 struct dma_fence *fence;
1432                 uint64_t point;
1433
1434                 fence = drm_syncobj_fence_get(syncobjs[i]);
1435                 chain = to_dma_fence_chain(fence);
1436                 if (chain) {
1437                         struct dma_fence *iter, *last_signaled =
1438                                 dma_fence_get(fence);
1439
1440                         if (args->flags &
1441                             DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1442                                 point = fence->seqno;
1443                         } else {
1444                                 dma_fence_chain_for_each(iter, fence) {
1445                                         if (iter->context != fence->context) {
1446                                                 dma_fence_put(iter);
1447                                                 /* It is most likely that timeline has
1448                                                 * unorder points. */
1449                                                 break;
1450                                         }
1451                                         dma_fence_put(last_signaled);
1452                                         last_signaled = dma_fence_get(iter);
1453                                 }
1454                                 point = dma_fence_is_signaled(last_signaled) ?
1455                                         last_signaled->seqno :
1456                                         to_dma_fence_chain(last_signaled)->prev_seqno;
1457                         }
1458                         dma_fence_put(last_signaled);
1459                 } else {
1460                         point = 0;
1461                 }
1462                 dma_fence_put(fence);
1463                 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1464                 ret = ret ? -EFAULT : 0;
1465                 if (ret)
1466                         break;
1467         }
1468         drm_syncobj_array_free(syncobjs, args->count_handles);
1469
1470         return ret;
1471 }