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         /* Waiting for userspace with locks help is illegal cause that can
 391          * trivial deadlock with page faults for example. Make lockdep complain
 392          * about it early on.
 393          */
 394         if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
 395                 might_sleep();
 396                 lockdep_assert_none_held_once();
 397         }
 398
 399         *fence = drm_syncobj_fence_get(syncobj);
 400
 401         if (*fence) {
 402                 ret = dma_fence_chain_find_seqno(fence, point);
 403                 if (!ret) {
 404                         /* If the requested seqno is already signaled
 405                          * drm_syncobj_find_fence may return a NULL
 406                          * fence. To make sure the recipient gets
 407                          * signalled, use a new fence instead.
 408                          */
 409                         if (!*fence)
 410                                 *fence = dma_fence_get_stub();
 411
 412                         goto out;
 413                 }
 414                 dma_fence_put(*fence);
 415         } else {
 416                 ret = -EINVAL;
 417         }
 418
 419         if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
 420                 goto out;
 421
 422         memset(&wait, 0, sizeof(wait));
 423         wait.task = current;
 424         wait.point = point;
 425         drm_syncobj_fence_add_wait(syncobj, &wait);
 426
 427         do {
 428                 set_current_state(TASK_INTERRUPTIBLE);
 429                 if (wait.fence) {
 430                         ret = 0;
 431                         break;
 432                 }
 433                 if (timeout == 0) {
 434                         ret = -ETIME;
 435                         break;
 436                 }
 437
 438                 if (signal_pending(current)) {
 439                         ret = -ERESTARTSYS;
 440                         break;
 441                 }
 442
 443                 timeout = schedule_timeout(timeout);
 444         } while (1);
 445
 446         __set_current_state(TASK_RUNNING);
 447         *fence = wait.fence;
 448
 449         if (wait.node.next)
 450                 drm_syncobj_remove_wait(syncobj, &wait);
 451
 452 out:
 453         drm_syncobj_put(syncobj);
 454
 455         return ret;
 456 }
 457 EXPORT_SYMBOL(drm_syncobj_find_fence);
 458
 459 /**
 460  * drm_syncobj_free - free a sync object.
 461  * @kref: kref to free.
 462  *
 463  * Only to be called from kref_put in drm_syncobj_put.
 464  */
 465 void drm_syncobj_free(struct kref *kref)
 466 {
 467         struct drm_syncobj *syncobj = container_of(kref,
 468                                                    struct drm_syncobj,
 469                                                    refcount);
 470         drm_syncobj_replace_fence(syncobj, NULL);
 471         kfree(syncobj);
 472 }
 473 EXPORT_SYMBOL(drm_syncobj_free);
 474
 475 /**
 476  * drm_syncobj_create - create a new syncobj
 477  * @out_syncobj: returned syncobj
 478  * @flags: DRM_SYNCOBJ_* flags
 479  * @fence: if non-NULL, the syncobj will represent this fence
 480  *
 481  * This is the first function to create a sync object. After creating, drivers
 482  * probably want to make it available to userspace, either through
 483  * drm_syncobj_get_handle() or drm_syncobj_get_fd().
 484  *
 485  * Returns 0 on success or a negative error value on failure.
 486  */
 487 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 488                        struct dma_fence *fence)
 489 {
 490         struct drm_syncobj *syncobj;
 491
 492         syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
 493         if (!syncobj)
 494                 return -ENOMEM;
 495
 496         kref_init(&syncobj->refcount);
 497         INIT_LIST_HEAD(&syncobj->cb_list);
 498         spin_lock_init(&syncobj->lock);
 499
 500         if (flags & DRM_SYNCOBJ_CREATE_SIGNALED)
 501                 drm_syncobj_assign_null_handle(syncobj);
 502
 503         if (fence)
 504                 drm_syncobj_replace_fence(syncobj, fence);
 505
 506         *out_syncobj = syncobj;
 507         return 0;
 508 }
 509 EXPORT_SYMBOL(drm_syncobj_create);
 510
 511 /**
 512  * drm_syncobj_get_handle - get a handle from a syncobj
 513  * @file_private: drm file private pointer
 514  * @syncobj: Sync object to export
 515  * @handle: out parameter with the new handle
 516  *
 517  * Exports a sync object created with drm_syncobj_create() as a handle on
 518  * @file_private to userspace.
 519  *
 520  * Returns 0 on success or a negative error value on failure.
 521  */
 522 int drm_syncobj_get_handle(struct drm_file *file_private,
 523                            struct drm_syncobj *syncobj, u32 *handle)
 524 {
 525         int ret;
 526
 527         /* take a reference to put in the idr */
 528         drm_syncobj_get(syncobj);
 529
 530         idr_preload(GFP_KERNEL);
 531         spin_lock(&file_private->syncobj_table_lock);
 532         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 533         spin_unlock(&file_private->syncobj_table_lock);
 534
 535         idr_preload_end();
 536
 537         if (ret < 0) {
 538                 drm_syncobj_put(syncobj);
 539                 return ret;
 540         }
 541
 542         *handle = ret;
 543         return 0;
 544 }
 545 EXPORT_SYMBOL(drm_syncobj_get_handle);
 546
 547 static int drm_syncobj_create_as_handle(struct drm_file *file_private,
 548                                         u32 *handle, uint32_t flags)
 549 {
 550         int ret;
 551         struct drm_syncobj *syncobj;
 552
 553         ret = drm_syncobj_create(&syncobj, flags, NULL);
 554         if (ret)
 555                 return ret;
 556
 557         ret = drm_syncobj_get_handle(file_private, syncobj, handle);
 558         drm_syncobj_put(syncobj);
 559         return ret;
 560 }
 561
 562 static int drm_syncobj_destroy(struct drm_file *file_private,
 563                                u32 handle)
 564 {
 565         struct drm_syncobj *syncobj;
 566
 567         spin_lock(&file_private->syncobj_table_lock);
 568         syncobj = idr_remove(&file_private->syncobj_idr, handle);
 569         spin_unlock(&file_private->syncobj_table_lock);
 570
 571         if (!syncobj)
 572                 return -EINVAL;
 573
 574         drm_syncobj_put(syncobj);
 575         return 0;
 576 }
 577
 578 static int drm_syncobj_file_release(struct inode *inode, struct file *file)
 579 {
 580         struct drm_syncobj *syncobj = file->private_data;
 581
 582         drm_syncobj_put(syncobj);
 583         return 0;
 584 }
 585
 586 static const struct file_operations drm_syncobj_file_fops = {
 587         .release = drm_syncobj_file_release,
 588 };
 589
 590 /**
 591  * drm_syncobj_get_fd - get a file descriptor from a syncobj
 592  * @syncobj: Sync object to export
 593  * @p_fd: out parameter with the new file descriptor
 594  *
 595  * Exports a sync object created with drm_syncobj_create() as a file descriptor.
 596  *
 597  * Returns 0 on success or a negative error value on failure.
 598  */
 599 int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd)
 600 {
 601         struct file *file;
 602         int fd;
 603
 604         fd = get_unused_fd_flags(O_CLOEXEC);
 605         if (fd < 0)
 606                 return fd;
 607
 608         file = anon_inode_getfile("syncobj_file",
 609                                   &drm_syncobj_file_fops,
 610                                   syncobj, 0);
 611         if (IS_ERR(file)) {
 612                 put_unused_fd(fd);
 613                 return PTR_ERR(file);
 614         }
 615
 616         drm_syncobj_get(syncobj);
 617         fd_install(fd, file);
 618
 619         *p_fd = fd;
 620         return 0;
 621 }
 622 EXPORT_SYMBOL(drm_syncobj_get_fd);
 623
 624 static int drm_syncobj_handle_to_fd(struct drm_file *file_private,
 625                                     u32 handle, int *p_fd)
 626 {
 627         struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle);
 628         int ret;
 629
 630         if (!syncobj)
 631                 return -EINVAL;
 632
 633         ret = drm_syncobj_get_fd(syncobj, p_fd);
 634         drm_syncobj_put(syncobj);
 635         return ret;
 636 }
 637
 638 static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 639                                     int fd, u32 *handle)
 640 {
 641         struct drm_syncobj *syncobj;
 642         struct fd f = fdget(fd);
 643         int ret;
 644
 645         if (!f.file)
 646                 return -EINVAL;
 647
 648         if (f.file->f_op != &drm_syncobj_file_fops) {
 649                 fdput(f);
 650                 return -EINVAL;
 651         }
 652
 653         /* take a reference to put in the idr */
 654         syncobj = f.file->private_data;
 655         drm_syncobj_get(syncobj);
 656
 657         idr_preload(GFP_KERNEL);
 658         spin_lock(&file_private->syncobj_table_lock);
 659         ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
 660         spin_unlock(&file_private->syncobj_table_lock);
 661         idr_preload_end();
 662
 663         if (ret > 0) {
 664                 *handle = ret;
 665                 ret = 0;
 666         } else
 667                 drm_syncobj_put(syncobj);
 668
 669         fdput(f);
 670         return ret;
 671 }
 672
 673 static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private,
 674                                               int fd, int handle)
 675 {
 676         struct dma_fence *fence = sync_file_get_fence(fd);
 677         struct drm_syncobj *syncobj;
 678
 679         if (!fence)
 680                 return -EINVAL;
 681
 682         syncobj = drm_syncobj_find(file_private, handle);
 683         if (!syncobj) {
 684                 dma_fence_put(fence);
 685                 return -ENOENT;
 686         }
 687
 688         drm_syncobj_replace_fence(syncobj, fence);
 689         dma_fence_put(fence);
 690         drm_syncobj_put(syncobj);
 691         return 0;
 692 }
 693
 694 static int drm_syncobj_export_sync_file(struct drm_file *file_private,
 695                                         int handle, int *p_fd)
 696 {
 697         int ret;
 698         struct dma_fence *fence;
 699         struct sync_file *sync_file;
 700         int fd = get_unused_fd_flags(O_CLOEXEC);
 701
 702         if (fd < 0)
 703                 return fd;
 704
 705         ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence);
 706         if (ret)
 707                 goto err_put_fd;
 708
 709         sync_file = sync_file_create(fence);
 710
 711         dma_fence_put(fence);
 712
 713         if (!sync_file) {
 714                 ret = -EINVAL;
 715                 goto err_put_fd;
 716         }
 717
 718         fd_install(fd, sync_file->file);
 719
 720         *p_fd = fd;
 721         return 0;
 722 err_put_fd:
 723         put_unused_fd(fd);
 724         return ret;
 725 }
 726 /**
 727  * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time
 728  * @file_private: drm file-private structure to set up
 729  *
 730  * Called at device open time, sets up the structure for handling refcounting
 731  * of sync objects.
 732  */
 733 void
 734 drm_syncobj_open(struct drm_file *file_private)
 735 {
 736         idr_init_base(&file_private->syncobj_idr, 1);
 737         spin_lock_init(&file_private->syncobj_table_lock);
 738 }
 739
 740 static int
 741 drm_syncobj_release_handle(int id, void *ptr, void *data)
 742 {
 743         struct drm_syncobj *syncobj = ptr;
 744
 745         drm_syncobj_put(syncobj);
 746         return 0;
 747 }
 748
 749 /**
 750  * drm_syncobj_release - release file-private sync object resources
 751  * @file_private: drm file-private structure to clean up
 752  *
 753  * Called at close time when the filp is going away.
 754  *
 755  * Releases any remaining references on objects by this filp.
 756  */
 757 void
 758 drm_syncobj_release(struct drm_file *file_private)
 759 {
 760         idr_for_each(&file_private->syncobj_idr,
 761                      &drm_syncobj_release_handle, file_private);
 762         idr_destroy(&file_private->syncobj_idr);
 763 }
 764
 765 int
 766 drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
 767                          struct drm_file *file_private)
 768 {
 769         struct drm_syncobj_create *args = data;
 770
 771         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 772                 return -EOPNOTSUPP;
 773
 774         /* no valid flags yet */
 775         if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED)
 776                 return -EINVAL;
 777
 778         return drm_syncobj_create_as_handle(file_private,
 779                                             &args->handle, args->flags);
 780 }
 781
 782 int
 783 drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
 784                           struct drm_file *file_private)
 785 {
 786         struct drm_syncobj_destroy *args = data;
 787
 788         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 789                 return -EOPNOTSUPP;
 790
 791         /* make sure padding is empty */
 792         if (args->pad)
 793                 return -EINVAL;
 794         return drm_syncobj_destroy(file_private, args->handle);
 795 }
 796
 797 int
 798 drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 799                                    struct drm_file *file_private)
 800 {
 801         struct drm_syncobj_handle *args = data;
 802
 803         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 804                 return -EOPNOTSUPP;
 805
 806         if (args->pad)
 807                 return -EINVAL;
 808
 809         if (args->flags != 0 &&
 810             args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 811                 return -EINVAL;
 812
 813         if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE)
 814                 return drm_syncobj_export_sync_file(file_private, args->handle,
 815                                                     &args->fd);
 816
 817         return drm_syncobj_handle_to_fd(file_private, args->handle,
 818                                         &args->fd);
 819 }
 820
 821 int
 822 drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 823                                    struct drm_file *file_private)
 824 {
 825         struct drm_syncobj_handle *args = data;
 826
 827         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
 828                 return -EOPNOTSUPP;
 829
 830         if (args->pad)
 831                 return -EINVAL;
 832
 833         if (args->flags != 0 &&
 834             args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 835                 return -EINVAL;
 836
 837         if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE)
 838                 return drm_syncobj_import_sync_file_fence(file_private,
 839                                                           args->fd,
 840                                                           args->handle);
 841
 842         return drm_syncobj_fd_to_handle(file_private, args->fd,
 843                                         &args->handle);
 844 }
 845
 846 static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
 847                                             struct drm_syncobj_transfer *args)
 848 {
 849         struct drm_syncobj *timeline_syncobj = NULL;
 850         struct dma_fence *fence;
 851         struct dma_fence_chain *chain;
 852         int ret;
 853
 854         timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 855         if (!timeline_syncobj) {
 856                 return -ENOENT;
 857         }
 858         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 859                                      args->src_point, args->flags,
 860                                      &fence);
 861         if (ret)
 862                 goto err;
 863         chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
 864         if (!chain) {
 865                 ret = -ENOMEM;
 866                 goto err1;
 867         }
 868         drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
 869 err1:
 870         dma_fence_put(fence);
 871 err:
 872         drm_syncobj_put(timeline_syncobj);
 873
 874         return ret;
 875 }
 876
 877 static int
 878 drm_syncobj_transfer_to_binary(struct drm_file *file_private,
 879                                struct drm_syncobj_transfer *args)
 880 {
 881         struct drm_syncobj *binary_syncobj = NULL;
 882         struct dma_fence *fence;
 883         int ret;
 884
 885         binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
 886         if (!binary_syncobj)
 887                 return -ENOENT;
 888         ret = drm_syncobj_find_fence(file_private, args->src_handle,
 889                                      args->src_point, args->flags, &fence);
 890         if (ret)
 891                 goto err;
 892         drm_syncobj_replace_fence(binary_syncobj, fence);
 893         dma_fence_put(fence);
 894 err:
 895         drm_syncobj_put(binary_syncobj);
 896
 897         return ret;
 898 }
 899 int
 900 drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
 901                            struct drm_file *file_private)
 902 {
 903         struct drm_syncobj_transfer *args = data;
 904         int ret;
 905
 906         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
 907                 return -EOPNOTSUPP;
 908
 909         if (args->pad)
 910                 return -EINVAL;
 911
 912         if (args->dst_point)
 913                 ret = drm_syncobj_transfer_to_timeline(file_private, args);
 914         else
 915                 ret = drm_syncobj_transfer_to_binary(file_private, args);
 916
 917         return ret;
 918 }
 919
 920 static void syncobj_wait_fence_func(struct dma_fence *fence,
 921                                     struct dma_fence_cb *cb)
 922 {
 923         struct syncobj_wait_entry *wait =
 924                 container_of(cb, struct syncobj_wait_entry, fence_cb);
 925
 926         wake_up_process(wait->task);
 927 }
 928
 929 static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
 930                                       struct syncobj_wait_entry *wait)
 931 {
 932         struct dma_fence *fence;
 933
 934         /* This happens inside the syncobj lock */
 935         fence = rcu_dereference_protected(syncobj->fence,
 936                                           lockdep_is_held(&syncobj->lock));
 937         dma_fence_get(fence);
 938         if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) {
 939                 dma_fence_put(fence);
 940                 return;
 941         } else if (!fence) {
 942                 wait->fence = dma_fence_get_stub();
 943         } else {
 944                 wait->fence = fence;
 945         }
 946
 947         wake_up_process(wait->task);
 948         list_del_init(&wait->node);
 949 }
 950
 951 static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 952                                                   void __user *user_points,
 953                                                   uint32_t count,
 954                                                   uint32_t flags,
 955                                                   signed long timeout,
 956                                                   uint32_t *idx)
 957 {
 958         struct syncobj_wait_entry *entries;
 959         struct dma_fence *fence;
 960         uint64_t *points;
 961         uint32_t signaled_count, i;
 962
 963         if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
 964                      DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
 965                 lockdep_assert_none_held_once();
 966
 967         points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
 968         if (points == NULL)
 969                 return -ENOMEM;
 970
 971         if (!user_points) {
 972                 memset(points, 0, count * sizeof(uint64_t));
 973
 974         } else if (copy_from_user(points, user_points,
 975                                   sizeof(uint64_t) * count)) {
 976                 timeout = -EFAULT;
 977                 goto err_free_points;
 978         }
 979
 980         entries = kcalloc(count, sizeof(*entries), GFP_KERNEL);
 981         if (!entries) {
 982                 timeout = -ENOMEM;
 983                 goto err_free_points;
 984         }
 985         /* Walk the list of sync objects and initialize entries.  We do
 986          * this up-front so that we can properly return -EINVAL if there is
 987          * a syncobj with a missing fence and then never have the chance of
 988          * returning -EINVAL again.
 989          */
 990         signaled_count = 0;
 991         for (i = 0; i < count; ++i) {
 992                 struct dma_fence *fence;
 993
 994                 entries[i].task = current;
 995                 entries[i].point = points[i];
 996                 fence = drm_syncobj_fence_get(syncobjs[i]);
 997                 if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
 998                         dma_fence_put(fence);
 999                         if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1000                                      DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
1001                                 continue;
1002                         } else {
1003                                 timeout = -EINVAL;
1004                                 goto cleanup_entries;
1005                         }
1006                 }
1007
1008                 if (fence)
1009                         entries[i].fence = fence;
1010                 else
1011                         entries[i].fence = dma_fence_get_stub();
1012
1013                 if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1014                     dma_fence_is_signaled(entries[i].fence)) {
1015                         if (signaled_count == 0 && idx)
1016                                 *idx = i;
1017                         signaled_count++;
1018                 }
1019         }
1020
1021         if (signaled_count == count ||
1022             (signaled_count > 0 &&
1023              !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL)))
1024                 goto cleanup_entries;
1025
1026         /* There's a very annoying laxness in the dma_fence API here, in
1027          * that backends are not required to automatically report when a
1028          * fence is signaled prior to fence->ops->enable_signaling() being
1029          * called.  So here if we fail to match signaled_count, we need to
1030          * fallthough and try a 0 timeout wait!
1031          */
1032
1033         if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1034                      DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
1035                 for (i = 0; i < count; ++i)
1036                         drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
1037         }
1038
1039         do {
1040                 set_current_state(TASK_INTERRUPTIBLE);
1041
1042                 signaled_count = 0;
1043                 for (i = 0; i < count; ++i) {
1044                         fence = entries[i].fence;
1045                         if (!fence)
1046                                 continue;
1047
1048                         if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) ||
1049                             dma_fence_is_signaled(fence) ||
1050                             (!entries[i].fence_cb.func &&
1051                              dma_fence_add_callback(fence,
1052                                                     &entries[i].fence_cb,
1053                                                     syncobj_wait_fence_func))) {
1054                                 /* The fence has been signaled */
1055                                 if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) {
1056                                         signaled_count++;
1057                                 } else {
1058                                         if (idx)
1059                                                 *idx = i;
1060                                         goto done_waiting;
1061                                 }
1062                         }
1063                 }
1064
1065                 if (signaled_count == count)
1066                         goto done_waiting;
1067
1068                 if (timeout == 0) {
1069                         timeout = -ETIME;
1070                         goto done_waiting;
1071                 }
1072
1073                 if (signal_pending(current)) {
1074                         timeout = -ERESTARTSYS;
1075                         goto done_waiting;
1076                 }
1077
1078                 timeout = schedule_timeout(timeout);
1079         } while (1);
1080
1081 done_waiting:
1082         __set_current_state(TASK_RUNNING);
1083
1084 cleanup_entries:
1085         for (i = 0; i < count; ++i) {
1086                 drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
1087                 if (entries[i].fence_cb.func)
1088                         dma_fence_remove_callback(entries[i].fence,
1089                                                   &entries[i].fence_cb);
1090                 dma_fence_put(entries[i].fence);
1091         }
1092         kfree(entries);
1093
1094 err_free_points:
1095         kfree(points);
1096
1097         return timeout;
1098 }
1099
1100 /**
1101  * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value
1102  *
1103  * @timeout_nsec: timeout nsec component in ns, 0 for poll
1104  *
1105  * Calculate the timeout in jiffies from an absolute time in sec/nsec.
1106  */
1107 signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec)
1108 {
1109         ktime_t abs_timeout, now;
1110         u64 timeout_ns, timeout_jiffies64;
1111
1112         /* make 0 timeout means poll - absolute 0 doesn't seem valid */
1113         if (timeout_nsec == 0)
1114                 return 0;
1115
1116         abs_timeout = ns_to_ktime(timeout_nsec);
1117         now = ktime_get();
1118
1119         if (!ktime_after(abs_timeout, now))
1120                 return 0;
1121
1122         timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now));
1123
1124         timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns);
1125         /*  clamp timeout to avoid infinite timeout */
1126         if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1)
1127                 return MAX_SCHEDULE_TIMEOUT - 1;
1128
1129         return timeout_jiffies64 + 1;
1130 }
1131 EXPORT_SYMBOL(drm_timeout_abs_to_jiffies);
1132
1133 static int drm_syncobj_array_wait(struct drm_device *dev,
1134                                   struct drm_file *file_private,
1135                                   struct drm_syncobj_wait *wait,
1136                                   struct drm_syncobj_timeline_wait *timeline_wait,
1137                                   struct drm_syncobj **syncobjs, bool timeline)
1138 {
1139         signed long timeout = 0;
1140         uint32_t first = ~0;
1141
1142         if (!timeline) {
1143                 timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec);
1144                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1145                                                          NULL,
1146                                                          wait->count_handles,
1147                                                          wait->flags,
1148                                                          timeout, &first);
1149                 if (timeout < 0)
1150                         return timeout;
1151                 wait->first_signaled = first;
1152         } else {
1153                 timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec);
1154                 timeout = drm_syncobj_array_wait_timeout(syncobjs,
1155                                                          u64_to_user_ptr(timeline_wait->points),
1156                                                          timeline_wait->count_handles,
1157                                                          timeline_wait->flags,
1158                                                          timeout, &first);
1159                 if (timeout < 0)
1160                         return timeout;
1161                 timeline_wait->first_signaled = first;
1162         }
1163         return 0;
1164 }
1165
1166 static int drm_syncobj_array_find(struct drm_file *file_private,
1167                                   void __user *user_handles,
1168                                   uint32_t count_handles,
1169                                   struct drm_syncobj ***syncobjs_out)
1170 {
1171         uint32_t i, *handles;
1172         struct drm_syncobj **syncobjs;
1173         int ret;
1174
1175         handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL);
1176         if (handles == NULL)
1177                 return -ENOMEM;
1178
1179         if (copy_from_user(handles, user_handles,
1180                            sizeof(uint32_t) * count_handles)) {
1181                 ret = -EFAULT;
1182                 goto err_free_handles;
1183         }
1184
1185         syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL);
1186         if (syncobjs == NULL) {
1187                 ret = -ENOMEM;
1188                 goto err_free_handles;
1189         }
1190
1191         for (i = 0; i < count_handles; i++) {
1192                 syncobjs[i] = drm_syncobj_find(file_private, handles[i]);
1193                 if (!syncobjs[i]) {
1194                         ret = -ENOENT;
1195                         goto err_put_syncobjs;
1196                 }
1197         }
1198
1199         kfree(handles);
1200         *syncobjs_out = syncobjs;
1201         return 0;
1202
1203 err_put_syncobjs:
1204         while (i-- > 0)
1205                 drm_syncobj_put(syncobjs[i]);
1206         kfree(syncobjs);
1207 err_free_handles:
1208         kfree(handles);
1209
1210         return ret;
1211 }
1212
1213 static void drm_syncobj_array_free(struct drm_syncobj **syncobjs,
1214                                    uint32_t count)
1215 {
1216         uint32_t i;
1217
1218         for (i = 0; i < count; i++)
1219                 drm_syncobj_put(syncobjs[i]);
1220         kfree(syncobjs);
1221 }
1222
1223 int
1224 drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
1225                        struct drm_file *file_private)
1226 {
1227         struct drm_syncobj_wait *args = data;
1228         struct drm_syncobj **syncobjs;
1229         int ret = 0;
1230
1231         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1232                 return -EOPNOTSUPP;
1233
1234         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1235                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT))
1236                 return -EINVAL;
1237
1238         if (args->count_handles == 0)
1239                 return -EINVAL;
1240
1241         ret = drm_syncobj_array_find(file_private,
1242                                      u64_to_user_ptr(args->handles),
1243                                      args->count_handles,
1244                                      &syncobjs);
1245         if (ret < 0)
1246                 return ret;
1247
1248         ret = drm_syncobj_array_wait(dev, file_private,
1249                                      args, NULL, syncobjs, false);
1250
1251         drm_syncobj_array_free(syncobjs, args->count_handles);
1252
1253         return ret;
1254 }
1255
1256 int
1257 drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
1258                                 struct drm_file *file_private)
1259 {
1260         struct drm_syncobj_timeline_wait *args = data;
1261         struct drm_syncobj **syncobjs;
1262         int ret = 0;
1263
1264         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1265                 return -EOPNOTSUPP;
1266
1267         if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
1268                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
1269                             DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
1270                 return -EINVAL;
1271
1272         if (args->count_handles == 0)
1273                 return -EINVAL;
1274
1275         ret = drm_syncobj_array_find(file_private,
1276                                      u64_to_user_ptr(args->handles),
1277                                      args->count_handles,
1278                                      &syncobjs);
1279         if (ret < 0)
1280                 return ret;
1281
1282         ret = drm_syncobj_array_wait(dev, file_private,
1283                                      NULL, args, syncobjs, true);
1284
1285         drm_syncobj_array_free(syncobjs, args->count_handles);
1286
1287         return ret;
1288 }
1289
1290
1291 int
1292 drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
1293                         struct drm_file *file_private)
1294 {
1295         struct drm_syncobj_array *args = data;
1296         struct drm_syncobj **syncobjs;
1297         uint32_t i;
1298         int ret;
1299
1300         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1301                 return -EOPNOTSUPP;
1302
1303         if (args->pad != 0)
1304                 return -EINVAL;
1305
1306         if (args->count_handles == 0)
1307                 return -EINVAL;
1308
1309         ret = drm_syncobj_array_find(file_private,
1310                                      u64_to_user_ptr(args->handles),
1311                                      args->count_handles,
1312                                      &syncobjs);
1313         if (ret < 0)
1314                 return ret;
1315
1316         for (i = 0; i < args->count_handles; i++)
1317                 drm_syncobj_replace_fence(syncobjs[i], NULL);
1318
1319         drm_syncobj_array_free(syncobjs, args->count_handles);
1320
1321         return 0;
1322 }
1323
1324 int
1325 drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
1326                          struct drm_file *file_private)
1327 {
1328         struct drm_syncobj_array *args = data;
1329         struct drm_syncobj **syncobjs;
1330         uint32_t i;
1331         int ret;
1332
1333         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
1334                 return -EOPNOTSUPP;
1335
1336         if (args->pad != 0)
1337                 return -EINVAL;
1338
1339         if (args->count_handles == 0)
1340                 return -EINVAL;
1341
1342         ret = drm_syncobj_array_find(file_private,
1343                                      u64_to_user_ptr(args->handles),
1344                                      args->count_handles,
1345                                      &syncobjs);
1346         if (ret < 0)
1347                 return ret;
1348
1349         for (i = 0; i < args->count_handles; i++)
1350                 drm_syncobj_assign_null_handle(syncobjs[i]);
1351
1352         drm_syncobj_array_free(syncobjs, args->count_handles);
1353
1354         return ret;
1355 }
1356
1357 int
1358 drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
1359                                   struct drm_file *file_private)
1360 {
1361         struct drm_syncobj_timeline_array *args = data;
1362         struct drm_syncobj **syncobjs;
1363         struct dma_fence_chain **chains;
1364         uint64_t *points;
1365         uint32_t i, j;
1366         int ret;
1367
1368         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1369                 return -EOPNOTSUPP;
1370
1371         if (args->flags != 0)
1372                 return -EINVAL;
1373
1374         if (args->count_handles == 0)
1375                 return -EINVAL;
1376
1377         ret = drm_syncobj_array_find(file_private,
1378                                      u64_to_user_ptr(args->handles),
1379                                      args->count_handles,
1380                                      &syncobjs);
1381         if (ret < 0)
1382                 return ret;
1383
1384         points = kmalloc_array(args->count_handles, sizeof(*points),
1385                                GFP_KERNEL);
1386         if (!points) {
1387                 ret = -ENOMEM;
1388                 goto out;
1389         }
1390         if (!u64_to_user_ptr(args->points)) {
1391                 memset(points, 0, args->count_handles * sizeof(uint64_t));
1392         } else if (copy_from_user(points, u64_to_user_ptr(args->points),
1393                                   sizeof(uint64_t) * args->count_handles)) {
1394                 ret = -EFAULT;
1395                 goto err_points;
1396         }
1397
1398         chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL);
1399         if (!chains) {
1400                 ret = -ENOMEM;
1401                 goto err_points;
1402         }
1403         for (i = 0; i < args->count_handles; i++) {
1404                 chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
1405                 if (!chains[i]) {
1406                         for (j = 0; j < i; j++)
1407                                 kfree(chains[j]);
1408                         ret = -ENOMEM;
1409                         goto err_chains;
1410                 }
1411         }
1412
1413         for (i = 0; i < args->count_handles; i++) {
1414                 struct dma_fence *fence = dma_fence_get_stub();
1415
1416                 drm_syncobj_add_point(syncobjs[i], chains[i],
1417                                       fence, points[i]);
1418                 dma_fence_put(fence);
1419         }
1420 err_chains:
1421         kfree(chains);
1422 err_points:
1423         kfree(points);
1424 out:
1425         drm_syncobj_array_free(syncobjs, args->count_handles);
1426
1427         return ret;
1428 }
1429
1430 int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
1431                             struct drm_file *file_private)
1432 {
1433         struct drm_syncobj_timeline_array *args = data;
1434         struct drm_syncobj **syncobjs;
1435         uint64_t __user *points = u64_to_user_ptr(args->points);
1436         uint32_t i;
1437         int ret;
1438
1439         if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
1440                 return -EOPNOTSUPP;
1441
1442         if (args->flags & ~DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED)
1443                 return -EINVAL;
1444
1445         if (args->count_handles == 0)
1446                 return -EINVAL;
1447
1448         ret = drm_syncobj_array_find(file_private,
1449                                      u64_to_user_ptr(args->handles),
1450                                      args->count_handles,
1451                                      &syncobjs);
1452         if (ret < 0)
1453                 return ret;
1454
1455         for (i = 0; i < args->count_handles; i++) {
1456                 struct dma_fence_chain *chain;
1457                 struct dma_fence *fence;
1458                 uint64_t point;
1459
1460                 fence = drm_syncobj_fence_get(syncobjs[i]);
1461                 chain = to_dma_fence_chain(fence);
1462                 if (chain) {
1463                         struct dma_fence *iter, *last_signaled =
1464                                 dma_fence_get(fence);
1465
1466                         if (args->flags &
1467                             DRM_SYNCOBJ_QUERY_FLAGS_LAST_SUBMITTED) {
1468                                 point = fence->seqno;
1469                         } else {
1470                                 dma_fence_chain_for_each(iter, fence) {
1471                                         if (iter->context != fence->context) {
1472                                                 dma_fence_put(iter);
1473                                                 /* It is most likely that timeline has
1474                                                 * unorder points. */
1475                                                 break;
1476                                         }
1477                                         dma_fence_put(last_signaled);
1478                                         last_signaled = dma_fence_get(iter);
1479                                 }
1480                                 point = dma_fence_is_signaled(last_signaled) ?
1481                                         last_signaled->seqno :
1482                                         to_dma_fence_chain(last_signaled)->prev_seqno;
1483                         }
1484                         dma_fence_put(last_signaled);
1485                 } else {
1486                         point = 0;
1487                 }
1488                 dma_fence_put(fence);
1489                 ret = copy_to_user(&points[i], &point, sizeof(uint64_t));
1490                 ret = ret ? -EFAULT : 0;
1491                 if (ret)
1492                         break;
1493         }
1494         drm_syncobj_array_free(syncobjs, args->count_handles);
1495
1496         return ret;
1497 }