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