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 int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
 354 {
 355         struct dma_fence *fence = dma_fence_allocate_private_stub();
 356
 357         if (IS_ERR(fence))
 358                 return PTR_ERR(fence);
 359
 360         drm_syncobj_replace_fence(syncobj, fence);
 361         dma_fence_put(fence);
 362         return 0;
 363 }
 364
 365 /* 5s default for wait submission */
 366 #define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL
 367 /**
 368  * drm_syncobj_find_fence - lookup and reference the fence in a sync object
 369  * @file_private: drm file private pointer
 370  * @handle: sync object handle to lookup.
 371  * @point: timeline point
 372  * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not
 373  * @fence: out parameter for the fence
 374  *
 375  * This is just a convenience function that combines drm_syncobj_find() and
 376  * drm_syncobj_fence_get().
 377  *
 378  * Returns 0 on success or a negative error value on failure. On success @fence
 379  * contains a reference to the fence, which must be released by calling
 380  * dma_fence_put().
 381  */
 382 int drm_syncobj_find_fence(struct drm_file *file_private,
 383                            u32 handle, u64 point, u64 flags,
 384                            struct dma_fence **fence)
 385 {
 386         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 387         struct syncobj_wait_entry wait;
 388         u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
 389         int ret;
 390
 391         if (!syncobj)
 392                 return -ENOENT;
 393
 394         /* Waiting for userspace with locks help is illegal cause that can
 395          * trivial deadlock with page faults for example. Make lockdep complain
 396          * about it early on.
 397          */
 398         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
 399                 might_sleep();
 400                 lockdep_assert_none_held_once();
 401         }
 402
 403         *fence = drm_syncobj_fence_get(syncobj);
 404
 405         if (*fence) {
 406                 ret = dma_fence_chain_find_seqno(fence, point);
 407                 if (!ret) {
 408                         /* If the requested seqno is already signaled
 409                          * drm_syncobj_find_fence may return a NULL
 410                          * fence. To make sure the recipient gets
 411                          * signalled, use a new fence instead.
 412                          */
 413                         if (!*fence)
 414                                 *fence = dma_fence_get_stub();
 415
 416                         goto out;
 417                 }
 418                 dma_fence_put(*fence);
 419         } else {
 420                 ret = -EINVAL;
 421         }
 422
 423         if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
 424                 goto out;
 425
 426         memset(&wait, 0, sizeof(wait));
 427         wait.task = current;
 428         wait.point = point;
 429         drm_syncobj_fence_add_wait(syncobj, &wait);
 430
 431         do {
 432                 set_current_state(TASK_INTERRUPTIBLE);
 433                 if (wait.fence) {
 434                         ret = 0;
 435                         break;
 436                 }
 437                 if (timeout == 0) {
 438                         ret = -ETIME;
 439                         break;
 440                 }
 441
 442                 if (signal_pending(current)) {
 443                         ret = -ERESTARTSYS;
 444                         break;
 445                 }
 446
 447                 timeout = schedule_timeout(timeout);
 448         } while (1);
 449
 450         __set_current_state(TASK_RUNNING);
 451         *fence = wait.fence;
 452
 453         if (wait.node.next)
 454                 drm_syncobj_remove_wait(syncobj, &wait);
 455
 456 out:
 457         drm_syncobj_put(syncobj);
 458
 459         return ret;
 460 }
 461 EXPORT_SYMBOL(drm_syncobj_find_fence);
 462
 463 /**
 464  * drm_syncobj_free - free a sync object.
 465  * @kref: kref to free.
 466  *
 467  * Only to be called from kref_put in drm_syncobj_put.
 468  */
 469 void drm_syncobj_free(struct kref *kref)
 470 {
 471         struct drm_syncobj *syncobj = container_of(kref,
 472                                                    struct drm_syncobj,
 473                                                    refcount);
 474         drm_syncobj_replace_fence(syncobj, NULL);
 475         kfree(syncobj);
 476 }
 477 EXPORT_SYMBOL(drm_syncobj_free);
 478
 479 /**
 480  * drm_syncobj_create - create a new syncobj
 481  * @out_syncobj: returned syncobj
 482  * @flags: DRM_SYNCOBJ_* flags
 483  * @fence: if non-NULL, the syncobj will represent this fence
 484  *
 485  * This is the first function to create a sync object. After creating, drivers
 486  * probably want to make it available to userspace, either through
 487  * drm_syncobj_get_handle() or drm_syncobj_get_fd().
 488  *
 489  * Returns 0 on success or a negative error value on failure.
 490  */
 491 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 492                        struct dma_fence *fence)
 493 {
 494         int ret;
 495         struct drm_syncobj *syncobj;
 496
 497         syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
 498         if (!syncobj)
 499                 return -ENOMEM;
 500
 501         kref_init(&syncobj->refcount);
 502         INIT_LIST_HEAD(&syncobj->cb_list);
 503         spin_lock_init(&syncobj->lock);
 504
 505         if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
 506                 ret = drm_syncobj_assign_null_handle(syncobj);
 507                 if (ret < 0) {
 508                         drm_syncobj_put(syncobj);
 509                         return ret;
 510                 }
 511         }
 512
 513         if (fence)
 514                 drm_syncobj_replace_fence(syncobj, fence);
 515
 516         *out_syncobj = syncobj;
 517         return 0;
 518 }
 519 EXPORT_SYMBOL(drm_syncobj_create);
 520
 521 /**
 522  * drm_syncobj_get_handle - get a handle from a syncobj
 523  * @file_private: drm file private pointer
 524  * @syncobj: Sync object to export
 525  * @handle: out parameter with the new handle
 526  *
 527  * Exports a sync object created with drm_syncobj_create() as a handle on
 528  * @file_private to userspace.
 529  *
 530  * Returns 0 on success or a negative error value on failure.
 531  */
 532 int drm_syncobj_get_handle(struct drm_file *file_private,
 533                            struct drm_syncobj *syncobj, u32 *handle)
 534 {
 535         int ret;
 536
 537         /* take a reference to put in the idr */
 538         drm_syncobj_get(syncobj);
 539
 540         idr_preload(GFP_KERNEL);
 541         spin_lock(&file_private->syncobj_table_lock);
 542         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 543         spin_unlock(&file_private->syncobj_table_lock);
 544
 545         idr_preload_end();
 546
 547         if (ret < 0) {
 548                 drm_syncobj_put(syncobj);
 549                 return ret;
 550         }
 551
 552         *handle = ret;
 553         return 0;
 554 }
 555 EXPORT_SYMBOL(drm_syncobj_get_handle);
 556
 557 static int drm_syncobj_create_as_handle(struct drm_file *file_private,
 558                                         u32 *handle, uint32_t flags)
 559 {
 560         int ret;
 561         struct drm_syncobj *syncobj;
 562
 563         ret = drm_syncobj_create(&syncobj, flags, NULL);
 564         if (ret)
 565                 return ret;
 566
 567         ret = drm_syncobj_get_handle(file_private, syncobj, handle);
 568         drm_syncobj_put(syncobj);
 569         return ret;
 570 }
 571
 572 static int drm_syncobj_destroy(struct drm_file *file_private,
 573                                u32 handle)
 574 {
 575         struct drm_syncobj *syncobj;
 576
 577         spin_lock(&file_private->syncobj_table_lock);
 578         syncobj = idr_remove(&file_private->syncobj_idr, handle);
 579         spin_unlock(&file_private->syncobj_table_lock);
 580
 581         if (!syncobj)
 582                 return -EINVAL;
 583
 584         drm_syncobj_put(syncobj);
 585         return 0;
 586 }
 587
 588 static int drm_syncobj_file_release(struct inode *inode, struct file *file)
 589 {
 590         struct drm_syncobj *syncobj = file->private_data;
 591
 592         drm_syncobj_put(syncobj);
 593         return 0;
 594 }
 595
 596 static const struct file_operations drm_syncobj_file_fops = {
 597         .release = drm_syncobj_file_release,
 598 };
 599
 600 /**
 601  * drm_syncobj_get_fd - get a file descriptor from a syncobj
 602  * @syncobj: Sync object to export
 603  * @p_fd: out parameter with the new file descriptor
 604  *
 605  * Exports a sync object created with drm_syncobj_create() as a file descriptor.
 606  *
 607  * Returns 0 on success or a negative error value on failure.
 608  */
 609 int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
 610 {
 611         struct file *file;
 612         int fd;
 613
 614         fd = get_unused_fd_flags(O_CLOEXEC);
 615         if (fd < 0)
 616                 return fd;
 617
 618         file = anon_inode_getfile("syncobj_file",
 619                                   &drm_syncobj_file_fops,
 620                                   syncobj, 0);
 621         if (IS_ERR(file)) {
 622                 put_unused_fd(fd);
 623                 return PTR_ERR(file);
 624         }
 625
 626         drm_syncobj_get(syncobj);
 627         fd_install(fd, file);
 628
 629         *p_fd = fd;
 630         return 0;
 631 }
 632 EXPORT_SYMBOL(drm_syncobj_get_fd);
 633
 634 static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
 635                                     u32 handle, int *p_fd)
 636 {
 637         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 638         int ret;
 639
 640         if (!syncobj)
 641                 return -EINVAL;
 642
 643         ret = drm_syncobj_get_fd(syncobj, p_fd);
 644         drm_syncobj_put(syncobj);
 645         return ret;
 646 }
 647
 648 static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 649                                     int fd, u32 *handle)
 650 {
 651         struct drm_syncobj *syncobj;
 652         struct fd f = fdget(fd);
 653         int ret;
 654
 655         if (!f.file)
 656                 return -EINVAL;
 657
 658         if (f.file->f_op != &drm_syncobj_file_fops) {
 659                 fdput(f);
 660                 return -EINVAL;
 661         }
 662
 663         /* take a reference to put in the idr */
 664         syncobj = f.file->private_data;
 665         drm_syncobj_get(syncobj);
 666
 667         idr_preload(GFP_KERNEL);
 668         spin_lock(&file_private->syncobj_table_lock);
 669         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 670         spin_unlock(&file_private->syncobj_table_lock);
 671         idr_preload_end();
 672
 673         if (ret > 0) {
 674                 *handle = ret;
 675                 ret = 0;
 676         } else
 677                 drm_syncobj_put(syncobj);
 678
 679         fdput(f);
 680         return ret;
 681 }
 682
 683 static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
 684                                               int fd, int handle)
 685 {
 686         struct dma_fence *fence = sync_file_get_fence(fd);
 687         struct drm_syncobj *syncobj;
 688
 689         if (!fence)
 690                 return -EINVAL;
 691
 692         syncobj = drm_syncobj_find(file_private, handle);
 693         if (!syncobj) {
 694                 dma_fence_put(fence);
 695                 return -ENOENT;
 696         }
 697
 698         drm_syncobj_replace_fence(syncobj, fence);
 699         dma_fence_put(fence);
 700         drm_syncobj_put(syncobj);
 701         return 0;
 702 }
 703
 704 static int drm_syncobj_export_sync_file(struct drm_file *file_private,
 705                                         int handle, int *p_fd)
 706 {
 707         int ret;
 708         struct dma_fence *fence;
 709         struct sync_file *sync_file;
 710         int fd = get_unused_fd_flags(O_CLOEXEC);
 711
 712         if (fd < 0)
 713                 return fd;
 714
 715         ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
 716         if (ret)
 717                 goto err_put_fd;
 718
 719         sync_file = sync_file_create(fence);
 720
 721         dma_fence_put(fence);
 722
 723         if (!sync_file) {
 724                 ret = -EINVAL;
 725                 goto err_put_fd;
 726         }
 727
 728         fd_install(fd, sync_file->file);
 729
 730         *p_fd = fd;
 731         return 0;
 732 err_put_fd:
 733         put_unused_fd(fd);
 734         return ret;
 735 }
 736 /**
 737  * drm_syncobj_open - initializes syncobj file-private structures at devnode open time
 738  * @file_private: drm file-private structure to set up
 739  *
 740  * Called at device open time, sets up the structure for handling refcounting
 741  * of sync objects.
 742  */
 743 void
 744 drm_syncobj_open(struct drm_file *file_private)
 745 {
 746         idr_init_base(&file_private->syncobj_idr, 1);
 747         spin_lock_init(&file_private->syncobj_table_lock);
 748 }
 749
 750 static int
 751 drm_syncobj_release_handle(int id, void *ptr, void *data)
 752 {
 753         struct drm_syncobj *syncobj = ptr;
 754
 755         drm_syncobj_put(syncobj);
 756         return 0;
 757 }
 758
 759 /**
 760  * drm_syncobj_release - release file-private sync object resources
 761  * @file_private: drm file-private structure to clean up
 762  *
 763  * Called at close time when the filp is going away.
 764  *
 765  * Releases any remaining references on objects by this filp.
 766  */
 767 void
 768 drm_syncobj_release(struct drm_file *file_private)
 769 {
 770         idr_for_each(&file_private->syncobj_idr,
 771                      &drm_syncobj_release_handle, file_private);
 772         idr_destroy(&file_private->syncobj_idr);
 773 }
 774
 775 int
 776 drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
 777                          struct drm_file *file_private)
 778 {
 779         struct drm_syncobj_create *args = data;
 780
 781         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 782                 return -EOPNOTSUPP;
 783
 784         /* no valid flags yet */
 785         if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
 786                 return -EINVAL;
 787
 788         return drm_syncobj_create_as_handle(file_private,
 789                                             &args->handle, args->flags);
 790 }
 791
 792 int
 793 drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
 794                           struct drm_file *file_private)
 795 {
 796         struct drm_syncobj_destroy *args = data;
 797
 798         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 799                 return -EOPNOTSUPP;
 800
 801         /* make sure padding is empty */
 802         if (args->pad)
 803                 return -EINVAL;
 804         return drm_syncobj_destroy(file_private, args->handle);
 805 }
 806
 807 int
 808 drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 809                                    struct drm_file *file_private)
 810 {
 811         struct drm_syncobj_handle *args = data;
 812
 813         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 814                 return -EOPNOTSUPP;
 815
 816         if (args->pad)
 817                 return -EINVAL;
 818
 819         if (args->flags != 0 &&
 820             args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 821                 return -EINVAL;
 822
 823         if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 824                 return drm_syncobj_export_sync_file(file_private, args->handle,
 825                                                     &args->fd);
 826
 827         return drm_syncobj_handle_to_fd(file_private, args->handle,
 828                                         &args->fd);
 829 }
 830
 831 int
 832 drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 833                                    struct drm_file *file_private)
 834 {
 835         struct drm_syncobj_handle *args = data;
 836
 837         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 838                 return -EOPNOTSUPP;
 839
 840         if (args->pad)
 841                 return -EINVAL;
 842
 843         if (args->flags != 0 &&
 844             args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 845                 return -EINVAL;
 846
 847         if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 848                 return drm_syncobj_import_sync_file_fence(file_private,
 849                                                           args->fd,
 850                                                           args->handle);
 851
 852         return drm_syncobj_fd_to_handle(file_private, args->fd,
 853                                         &args->handle);
 854 }
 855
 856 static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 857                                             struct drm_syncobj_transfer *args)
 858 {
 859         struct drm_syncobj *timeline_syncobj = NULL;
 860         struct dma_fence *fence;
 861         struct dma_fence_chain *chain;
 862         int ret;
 863
 864         timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 865         if (!timeline_syncobj) {
 866                 return -ENOENT;
 867         }
 868         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 869                                      args->src_point, args->flags,
 870                                      &fence);
 871         if (ret)
 872                 goto err;
 873         chain = dma_fence_chain_alloc();
 874         if (!chain) {
 875                 ret = -ENOMEM;
 876                 goto err1;
 877         }
 878         drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
 879 err1:
 880         dma_fence_put(fence);
 881 err:
 882         drm_syncobj_put(timeline_syncobj);
 883
 884         return ret;
 885 }
 886
 887 static int
 888 drm_syncobj_transfer_to_binary(struct drm_file *file_private,
 889                                struct drm_syncobj_transfer *args)
 890 {
 891         struct drm_syncobj *binary_syncobj = NULL;
 892         struct dma_fence *fence;
 893         int ret;
 894
 895         binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 896         if (!binary_syncobj)
 897                 return -ENOENT;
 898         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 899                                      args->src_point, args->flags, &fence);
 900         if (ret)
 901                 goto err;
 902         drm_syncobj_replace_fence(binary_syncobj, fence);
 903         dma_fence_put(fence);
 904 err:
 905         drm_syncobj_put(binary_syncobj);
 906
 907         return ret;
 908 }
 909 int
 910 drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
 911                            struct drm_file *file_private)
 912 {
 913         struct drm_syncobj_transfer *args = data;
 914         int ret;
 915
 916         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
 917                 return -EOPNOTSUPP;
 918
 919         if (args->pad)
 920                 return -EINVAL;
 921
 922         if (args->dst_point)
 923                 ret = drm_syncobj_transfer_to_timeline(file_private, args);
 924         else
 925                 ret = drm_syncobj_transfer_to_binary(file_private, args);
 926
 927         return ret;
 928 }
 929
 930 static void syncobj_wait_fence_func(struct dma_fence *fence,
 931                                     struct dma_fence_cb *cb)
 932 {
 933         struct syncobj_wait_entry *wait =
 934                 container_of(cb, struct syncobj_wait_entry, fence_cb);
 935
 936         wake_up_process(wait->task);
 937 }
 938
 939 static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
 940                                       struct syncobj_wait_entry *wait)
 941 {
 942         struct dma_fence *fence;
 943
 944         /* This happens inside the syncobj lock */
 945         fence = rcu_dereference_protected(syncobj->fence,
 946                                           lockdep_is_held(&syncobj->lock));
 947         dma_fence_get(fence);
 948         if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
 949                 dma_fence_put(fence);
 950                 return;
 951         } else if (!fence) {
 952                 wait->fence = dma_fence_get_stub();
 953         } else {
 954                 wait->fence = fence;
 955         }
 956
 957         wake_up_process(wait->task);
 958         list_del_init(&wait->node);
 959 }
 960
 961 static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 962                                                   void __user *user_points,
 963                                                   uint32_t count,
 964                                                   uint32_t flags,
 965                                                   signed long timeout,
 966                                                   uint32_t *idx)
 967 {
 968         struct syncobj_wait_entry *entries;
 969         struct dma_fence *fence;
 970         uint64_t *points;
 971         uint32_t signaled_count, i;
 972
 973         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)
 974                 lockdep_assert_none_held_once();
 975
 976         points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
 977         if (points == NULL)
 978                 return -ENOMEM;
 979
 980         if (!user_points) {
 981                 memset(points, 0, count * sizeof(uint64_t));
 982
 983         } else if (copy_from_user(points, user_points,
 984                                   sizeof(uint64_t) * count)) {
 985                 timeout = -EFAULT;
 986                 goto err_free_points;
 987         }
 988
 989         entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
 990         if (!entries) {
 991                 timeout = -ENOMEM;
 992                 goto err_free_points;
 993         }
 994         /* Walk the list of sync objects and initialize entries.  We do
 995          * this up-front so that we can properly return -EINVAL if there is
 996          * a syncobj with a missing fence and then never have the chance of
 997          * returning -EINVAL again.
 998          */
 999         signaled_count = 0;
1000         for (i = 0; i < count; ++i) {
1001                 struct dma_fence *fence;
1002
1003                 entries[i].task = current;
1004                 entries[i].point = points[i];
1005                 fence = drm_syncobj_fence_get(syncobjs[i]);
1006                 if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
1007                         dma_fence_put(fence);
1008                         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
1009                                 continue;
1010                         } else {
1011                                 timeout = -EINVAL;
1012                                 goto cleanup_entries;
1013                         }
1014                 }
1015
1016                 if (fence)
1017                         entries[i].fence = fence;
1018                 else
1019                         entries[i].fence = dma_fence_get_stub();
1020
1021                 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1022                     dma_fence_is_signaled(entries[i].fence)) {
1023                         if (signaled_count == 0 && idx)
1024                                 *idx = i;
1025                         signaled_count++;
1026                 }
1027         }
1028
1029         if (signaled_count == count ||
1030             (signaled_count > 0 &&
1031              !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
1032                 goto cleanup_entries;
1033
1034         /* There's a very annoying laxness in the dma_fence API here, in
1035          * that backends are not required to automatically report when a
1036          * fence is signaled prior to fence->ops->enable_signaling() being
1037          * called.  So here if we fail to match signaled_count, we need to
1038          * fallthough and try a 0 timeout wait!
1039          */
1040
1041         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
1042                 for (i = 0; i < count; ++i)
1043                         drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
1044         }
1045
1046         do {
1047                 set_current_state(TASK_INTERRUPTIBLE);
1048
1049                 signaled_count = 0;
1050                 for (i = 0; i < count; ++i) {
1051                         fence = entries[i].fence;
1052                         if (!fence)
1053                                 continue;
1054
1055                         if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1056                             dma_fence_is_signaled(fence) ||
1057                             (!entries[i].fence_cb.func &&
1058                              dma_fence_add_callback(fence,
1059                                                     &entries[i].fence_cb,
1060                                                     syncobj_wait_fence_func))) {
1061                                 /* The fence has been signaled */
1062                                 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
1063                                         signaled_count++;
1064                                 } else {
1065                                         if (idx)
1066                                                 *idx = i;
1067                                         goto done_waiting;
1068                                 }
1069                         }
1070                 }
1071
1072                 if (signaled_count == count)
1073                         goto done_waiting;
1074
1075                 if (timeout == 0) {
1076                         timeout = -ETIME;
1077                         goto done_waiting;
1078                 }
1079
1080                 if (signal_pending(current)) {
1081                         timeout = -ERESTARTSYS;
1082                         goto done_waiting;
1083                 }
1084
1085                 timeout = schedule_timeout(timeout);
1086         } while (1);
1087
1088 done_waiting:
1089         __set_current_state(TASK_RUNNING);
1090
1091 cleanup_entries:
1092         for (i = 0; i < count; ++i) {
1093                 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
1094                 if (entries[i].fence_cb.func)
1095                         dma_fence_remove_callback(entries[i].fence,
1096                                                   &entries[i].fence_cb);
1097                 dma_fence_put(entries[i].fence);
1098         }
1099         kfree(entries);
1100
1101 err_free_points:
1102         kfree(points);
1103
1104         return timeout;
1105 }
1106
1107 /**
1108  * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
1109  *
1110  * @timeout_nsec: timeout nsec component in ns, 0 for poll
1111  *
1112  * Calculate the timeout in jiffies from an absolute time in sec/nsec.
1113  */
1114 signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
1115 {
1116         ktime_t abs_timeout, now;
1117         u64 timeout_ns, timeout_jiffies64;
1118
1119         /* make 0 timeout means poll - absolute 0 doesn't seem valid */
1120         if (timeout_nsec == 0)
1121                 return 0;
1122
1123         abs_timeout = ns_to_ktime(timeout_nsec);
1124         now = ktime_get();
1125
1126         if (!ktime_after(abs_timeout, now))
1127                 return 0;
1128
1129         timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
1130
1131         timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
1132         /*  clamp timeout to avoid infinite timeout */
1133         if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
1134                 return MAX_SCHEDULE_TIMEOUT - 1;
1135
1136         return timeout_jiffies64 + 1;
1137 }
1138 EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
1139
1140 static int drm_syncobj_array_wait(struct drm_device *dev,
1141                                   struct drm_file *file_private,
1142                                   struct drm_syncobj_wait *wait,
1143                                   struct drm_syncobj_timeline_wait *timeline_wait,
1144                                   struct drm_syncobj **syncobjs, bool timeline)
1145 {
1146         signed long timeout = 0;
1147         uint32_t first = ~0;
1148
1149         if (!timeline) {
1150                 timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
1151                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1152                                                          NULL,
1153                                                          wait->count_handles,
1154                                                          wait->flags,
1155                                                          timeout, &first);
1156                 if (timeout < 0)
1157                         return timeout;
1158                 wait->first_signaled = first;
1159         } else {
1160                 timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec);
1161                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1162                                                          u64_to_user_ptr(timeline_wait->points),
1163                                                          timeline_wait->count_handles,
1164                                                          timeline_wait->flags,
1165                                                          timeout, &first);
1166                 if (timeout < 0)
1167                         return timeout;
1168                 timeline_wait->first_signaled = first;
1169         }
1170         return 0;
1171 }
1172
1173 static int drm_syncobj_array_find(struct drm_file *file_private,
1174                                   void __user *user_handles,
1175                                   uint32_t count_handles,
1176                                   struct drm_syncobj ***syncobjs_out)
1177 {
1178         uint32_t i, *handles;
1179         struct drm_syncobj **syncobjs;
1180         int ret;
1181
1182         handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
1183         if (handles == NULL)
1184                 return -ENOMEM;
1185
1186         if (copy_from_user(handles, user_handles,
1187                            sizeof(uint32_t) * count_handles)) {
1188                 ret = -EFAULT;
1189                 goto err_free_handles;
1190         }
1191
1192         syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
1193         if (syncobjs == NULL) {
1194                 ret = -ENOMEM;
1195                 goto err_free_handles;
1196         }
1197
1198         for (i = 0; i < count_handles; i++) {
1199                 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
1200                 if (!syncobjs[i]) {
1201                         ret = -ENOENT;
1202                         goto err_put_syncobjs;
1203                 }
1204         }
1205
1206         kfree(handles);
1207         *syncobjs_out = syncobjs;
1208         return 0;
1209
1210 err_put_syncobjs:
1211         while (i-- > 0)
1212                 drm_syncobj_put(syncobjs[i]);
1213         kfree(syncobjs);
1214 err_free_handles:
1215         kfree(handles);
1216
1217         return ret;
1218 }
1219
1220 static void drm_syncobj_array_free(struct drm_syncobj **syncobjs,
1221                                    uint32_t count)
1222 {
1223         uint32_t i;
1224
1225         for (i = 0; i < count; i++)
1226                 drm_syncobj_put(syncobjs[i]);
1227         kfree(syncobjs);
1228 }
1229
1230 int
1231 drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1232                        struct drm_file *file_private)
1233 {
1234         struct drm_syncobj_wait *args = data;
1235         struct drm_syncobj **syncobjs;
1236         int ret = 0;
1237
1238         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1239                 return -EOPNOTSUPP;
1240
1241         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1242                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
1243                 return -EINVAL;
1244
1245         if (args->count_handles == 0)
1246                 return -EINVAL;
1247
1248         ret = drm_syncobj_array_find(file_private,
1249                                      u64_to_user_ptr(args->handles),
1250                                      args->count_handles,
1251                                      &syncobjs);
1252         if (ret < 0)
1253                 return ret;
1254
1255         ret = drm_syncobj_array_wait(dev, file_private,
1256                                      args, NULL, syncobjs, false);
1257
1258         drm_syncobj_array_free(syncobjs, args->count_handles);
1259
1260         return ret;
1261 }
1262
1263 int
1264 drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1265                                 struct drm_file *file_private)
1266 {
1267         struct drm_syncobj_timeline_wait *args = data;
1268         struct drm_syncobj **syncobjs;
1269         int ret = 0;
1270
1271         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1272                 return -EOPNOTSUPP;
1273
1274         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1275                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1276                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1277                 return -EINVAL;
1278
1279         if (args->count_handles == 0)
1280                 return -EINVAL;
1281
1282         ret = drm_syncobj_array_find(file_private,
1283                                      u64_to_user_ptr(args->handles),
1284                                      args->count_handles,
1285                                      &syncobjs);
1286         if (ret < 0)
1287                 return ret;
1288
1289         ret = drm_syncobj_array_wait(dev, file_private,
1290                                      NULL, args, syncobjs, true);
1291
1292         drm_syncobj_array_free(syncobjs, args->count_handles);
1293
1294         return ret;
1295 }
1296
1297
1298 int
1299 drm_syncobj_reset_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_replace_fence(syncobjs[i], NULL);
1325
1326         drm_syncobj_array_free(syncobjs, args->count_handles);
1327
1328         return 0;
1329 }
1330
1331 int
1332 drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1333                          struct drm_file *file_private)
1334 {
1335         struct drm_syncobj_array *args = data;
1336         struct drm_syncobj **syncobjs;
1337         uint32_t i;
1338         int ret;
1339
1340         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1341                 return -EOPNOTSUPP;
1342
1343         if (args->pad != 0)
1344                 return -EINVAL;
1345
1346         if (args->count_handles == 0)
1347                 return -EINVAL;
1348
1349         ret = drm_syncobj_array_find(file_private,
1350                                      u64_to_user_ptr(args->handles),
1351                                      args->count_handles,
1352                                      &syncobjs);
1353         if (ret < 0)
1354                 return ret;
1355
1356         for (i = 0; i < args->count_handles; i++) {
1357                 ret = drm_syncobj_assign_null_handle(syncobjs[i]);
1358                 if (ret < 0)
1359                         break;
1360         }
1361
1362         drm_syncobj_array_free(syncobjs, args->count_handles);
1363
1364         return ret;
1365 }
1366
1367 int
1368 drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1369                                   struct drm_file *file_private)
1370 {
1371         struct drm_syncobj_timeline_array *args = data;
1372         struct drm_syncobj **syncobjs;
1373         struct dma_fence_chain **chains;
1374         uint64_t *points;
1375         uint32_t i, j;
1376         int ret;
1377
1378         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1379                 return -EOPNOTSUPP;
1380
1381         if (args->flags != 0)
1382                 return -EINVAL;
1383
1384         if (args->count_handles == 0)
1385                 return -EINVAL;
1386
1387         ret = drm_syncobj_array_find(file_private,
1388                                      u64_to_user_ptr(args->handles),
1389                                      args->count_handles,
1390                                      &syncobjs);
1391         if (ret < 0)
1392                 return ret;
1393
1394         points = kmalloc_array(args->count_handles, sizeof(*points),
1395                                GFP_KERNEL);
1396         if (!points) {
1397                 ret = -ENOMEM;
1398                 goto out;
1399         }
1400         if (!u64_to_user_ptr(args->points)) {
1401                 memset(points, 0, args->count_handles * sizeof(uint64_t));
1402         } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1403                                   sizeof(uint64_t) * args->count_handles)) {
1404                 ret = -EFAULT;
1405                 goto err_points;
1406         }
1407
1408         chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1409         if (!chains) {
1410                 ret = -ENOMEM;
1411                 goto err_points;
1412         }
1413         for (i = 0; i < args->count_handles; i++) {
1414                 chains[i] = dma_fence_chain_alloc();
1415                 if (!chains[i]) {
1416                         for (j = 0; j < i; j++)
1417                                 dma_fence_chain_free(chains[j]);
1418                         ret = -ENOMEM;
1419                         goto err_chains;
1420                 }
1421         }
1422
1423         for (i = 0; i < args->count_handles; i++) {
1424                 struct dma_fence *fence = dma_fence_get_stub();
1425
1426                 drm_syncobj_add_point(syncobjs[i], chains[i],
1427                                       fence, points[i]);
1428                 dma_fence_put(fence);
1429         }
1430 err_chains:
1431         kfree(chains);
1432 err_points:
1433         kfree(points);
1434 out:
1435         drm_syncobj_array_free(syncobjs, args->count_handles);
1436
1437         return ret;
1438 }
1439
1440 int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1441                             struct drm_file *file_private)
1442 {
1443         struct drm_syncobj_timeline_array *args = data;
1444         struct drm_syncobj **syncobjs;
1445         uint64_t __user *points = u64_to_user_ptr(args->points);
1446         uint32_t i;
1447         int ret;
1448
1449         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1450                 return -EOPNOTSUPP;
1451
1452         if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
1453                 return -EINVAL;
1454
1455         if (args->count_handles == 0)
1456                 return -EINVAL;
1457
1458         ret = drm_syncobj_array_find(file_private,
1459                                      u64_to_user_ptr(args->handles),
1460                                      args->count_handles,
1461                                      &syncobjs);
1462         if (ret < 0)
1463                 return ret;
1464
1465         for (i = 0; i < args->count_handles; i++) {
1466                 struct dma_fence_chain *chain;
1467                 struct dma_fence *fence;
1468                 uint64_t point;
1469
1470                 fence = drm_syncobj_fence_get(syncobjs[i]);
1471                 chain = to_dma_fence_chain(fence);
1472                 if (chain) {
1473                         struct dma_fence *iter, *last_signaled =
1474                                 dma_fence_get(fence);
1475
1476                         if (args->flags &
1477                             DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1478                                 point = fence->seqno;
1479                         } else {
1480                                 dma_fence_chain_for_each(iter, fence) {
1481                                         if (iter->context != fence->context) {
1482                                                 dma_fence_put(iter);
1483                                                 /* It is most likely that timeline has
1484                                                 * unorder points. */
1485                                                 break;
1486                                         }
1487                                         dma_fence_put(last_signaled);
1488                                         last_signaled = dma_fence_get(iter);
1489                                 }
1490                                 point = dma_fence_is_signaled(last_signaled) ?
1491                                         last_signaled->seqno :
1492                                         to_dma_fence_chain(last_signaled)->prev_seqno;
1493                         }
1494                         dma_fence_put(last_signaled);
1495                 } else {
1496                         point = 0;
1497                 }
1498                 dma_fence_put(fence);
1499                 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1500                 ret = ret ? -EFAULT : 0;
1501                 if (ret)
1502                         break;
1503         }
1504         drm_syncobj_array_free(syncobjs, args->count_handles);
1505
1506         return ret;
1507 }