drivers/gpu/drm/msm/msm_gem_submit.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <linux/file.h>
   8 #include <linux/sync_file.h>
   9 #include <linux/uaccess.h>
  10
  11 #include <drm/drm_drv.h>
  12 #include <drm/drm_file.h>
  13 #include <drm/drm_syncobj.h>
  14
  15 #include "msm_drv.h"
  16 #include "msm_gpu.h"
  17 #include "msm_gem.h"
  18 #include "msm_gpu_trace.h"
  19
  20 /*
  21  * Cmdstream submission:
  22  */
  23
  24 static struct msm_gem_submit *submit_create(struct drm_device *dev,
  25                 struct msm_gpu *gpu,
  26                 struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
  27                 uint32_t nr_cmds)
  28 {
  29         static atomic_t ident = ATOMIC_INIT(0);
  30         struct msm_gem_submit *submit;
  31         uint64_t sz;
  32         int ret;
  33
  34         sz = struct_size(submit, bos, nr_bos) +
  35                         ((u64)nr_cmds * sizeof(submit->cmd[0]));
  36
  37         if (sz > SIZE_MAX)
  38                 return ERR_PTR(-ENOMEM);
  39
  40         submit = kzalloc(sz, GFP_KERNEL);
  41         if (!submit)
  42                 return ERR_PTR(-ENOMEM);
  43
  44         submit->hw_fence = msm_fence_alloc();
  45         if (IS_ERR(submit->hw_fence)) {
  46                 ret = PTR_ERR(submit->hw_fence);
  47                 kfree(submit);
  48                 return ERR_PTR(ret);
  49         }
  50
  51         ret = drm_sched_job_init(&submit->base, queue->entity, queue);
  52         if (ret) {
  53                 kfree(submit->hw_fence);
  54                 kfree(submit);
  55                 return ERR_PTR(ret);
  56         }
  57
  58         kref_init(&submit->ref);
  59         submit->dev = dev;
  60         submit->aspace = queue->ctx->aspace;
  61         submit->gpu = gpu;
  62         submit->cmd = (void *)&submit->bos[nr_bos];
  63         submit->queue = queue;
  64         submit->pid = get_pid(task_pid(current));
  65         submit->ring = gpu->rb[queue->ring_nr];
  66         submit->fault_dumped = false;
  67
  68         /* Get a unique identifier for the submission for logging purposes */
  69         submit->ident = atomic_inc_return(&ident) - 1;
  70
  71         INIT_LIST_HEAD(&submit->node);
  72
  73         return submit;
  74 }
  75
  76 void __msm_gem_submit_destroy(struct kref *kref)
  77 {
  78         struct msm_gem_submit *submit =
  79                         container_of(kref, struct msm_gem_submit, ref);
  80         unsigned i;
  81
  82         if (submit->fence_id) {
  83                 spin_lock(&submit->queue->idr_lock);
  84                 idr_remove(&submit->queue->fence_idr, submit->fence_id);
  85                 spin_unlock(&submit->queue->idr_lock);
  86         }
  87
  88         dma_fence_put(submit->user_fence);
  89
  90         /*
  91          * If the submit is freed before msm_job_run(), then hw_fence is
  92          * just some pre-allocated memory, not a reference counted fence.
  93          * Once the job runs and the hw_fence is initialized, it will
  94          * have a refcount of at least one, since the submit holds a ref
  95          * to the hw_fence.
  96          */
  97         if (kref_read(&submit->hw_fence->refcount) == 0) {
  98                 kfree(submit->hw_fence);
  99         } else {
 100                 dma_fence_put(submit->hw_fence);
 101         }
 102
 103         put_pid(submit->pid);
 104         msm_submitqueue_put(submit->queue);
 105
 106         for (i = 0; i < submit->nr_cmds; i++)
 107                 kfree(submit->cmd[i].relocs);
 108
 109         kfree(submit);
 110 }
 111
 112 static int submit_lookup_objects(struct msm_gem_submit *submit,
 113                 struct drm_msm_gem_submit *args, struct drm_file *file)
 114 {
 115         unsigned i;
 116         int ret = 0;
 117
 118         for (i = 0; i < args->nr_bos; i++) {
 119                 struct drm_msm_gem_submit_bo submit_bo;
 120                 void __user *userptr =
 121                         u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
 122
 123                 /* make sure we don't have garbage flags, in case we hit
 124                  * error path before flags is initialized:
 125                  */
 126                 submit->bos[i].flags = 0;
 127
 128                 if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
 129                         ret = -EFAULT;
 130                         i = 0;
 131                         goto out;
 132                 }
 133
 134 /* at least one of READ and/or WRITE flags should be set: */
 135 #define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE)
 136
 137                 if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
 138                         !(submit_bo.flags & MANDATORY_FLAGS)) {
 139                         DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
 140                         ret = -EINVAL;
 141                         i = 0;
 142                         goto out;
 143                 }
 144
 145                 submit->bos[i].handle = submit_bo.handle;
 146                 submit->bos[i].flags = submit_bo.flags;
 147                 /* in validate_objects() we figure out if this is true: */
 148                 submit->bos[i].iova  = submit_bo.presumed;
 149         }
 150
 151         spin_lock(&file->table_lock);
 152
 153         for (i = 0; i < args->nr_bos; i++) {
 154                 struct drm_gem_object *obj;
 155
 156                 /* normally use drm_gem_object_lookup(), but for bulk lookup
 157                  * all under single table_lock just hit object_idr directly:
 158                  */
 159                 obj = idr_find(&file->object_idr, submit->bos[i].handle);
 160                 if (!obj) {
 161                         DRM_ERROR("invalid handle %u at index %u\n", submit->bos[i].handle, i);
 162                         ret = -EINVAL;
 163                         goto out_unlock;
 164                 }
 165
 166                 drm_gem_object_get(obj);
 167
 168                 submit->bos[i].obj = to_msm_bo(obj);
 169         }
 170
 171 out_unlock:
 172         spin_unlock(&file->table_lock);
 173
 174 out:
 175         submit->nr_bos = i;
 176
 177         return ret;
 178 }
 179
 180 static int submit_lookup_cmds(struct msm_gem_submit *submit,
 181                 struct drm_msm_gem_submit *args, struct drm_file *file)
 182 {
 183         unsigned i;
 184         size_t sz;
 185         int ret = 0;
 186
 187         for (i = 0; i < args->nr_cmds; i++) {
 188                 struct drm_msm_gem_submit_cmd submit_cmd;
 189                 void __user *userptr =
 190                         u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
 191
 192                 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
 193                 if (ret) {
 194                         ret = -EFAULT;
 195                         goto out;
 196                 }
 197
 198                 /* validate input from userspace: */
 199                 switch (submit_cmd.type) {
 200                 case MSM_SUBMIT_CMD_BUF:
 201                 case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 202                 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 203                         break;
 204                 default:
 205                         DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
 206                         return -EINVAL;
 207                 }
 208
 209                 if (submit_cmd.size % 4) {
 210                         DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 211                                         submit_cmd.size);
 212                         ret = -EINVAL;
 213                         goto out;
 214                 }
 215
 216                 submit->cmd[i].type = submit_cmd.type;
 217                 submit->cmd[i].size = submit_cmd.size / 4;
 218                 submit->cmd[i].offset = submit_cmd.submit_offset / 4;
 219                 submit->cmd[i].idx  = submit_cmd.submit_idx;
 220                 submit->cmd[i].nr_relocs = submit_cmd.nr_relocs;
 221
 222                 userptr = u64_to_user_ptr(submit_cmd.relocs);
 223
 224                 sz = array_size(submit_cmd.nr_relocs,
 225                                 sizeof(struct drm_msm_gem_submit_reloc));
 226                 /* check for overflow: */
 227                 if (sz == SIZE_MAX) {
 228                         ret = -ENOMEM;
 229                         goto out;
 230                 }
 231                 submit->cmd[i].relocs = kmalloc(sz, GFP_KERNEL);
 232                 if (!submit->cmd[i].relocs) {
 233                         ret = -ENOMEM;
 234                         goto out;
 235                 }
 236                 ret = copy_from_user(submit->cmd[i].relocs, userptr, sz);
 237                 if (ret) {
 238                         ret = -EFAULT;
 239                         goto out;
 240                 }
 241         }
 242
 243 out:
 244         return ret;
 245 }
 246
 247 /* Unwind bo state, according to cleanup_flags.  In the success case, only
 248  * the lock is dropped at the end of the submit (and active/pin ref is dropped
 249  * later when the submit is retired).
 250  */
 251 static void submit_cleanup_bo(struct msm_gem_submit *submit, int i,
 252                 unsigned cleanup_flags)
 253 {
 254         struct drm_gem_object *obj = &submit->bos[i].obj->base;
 255         unsigned flags = submit->bos[i].flags & cleanup_flags;
 256
 257         /*
 258          * Clear flags bit before dropping lock, so that the msm_job_run()
 259          * path isn't racing with submit_cleanup() (ie. the read/modify/
 260          * write is protected by the obj lock in all paths)
 261          */
 262         submit->bos[i].flags &= ~cleanup_flags;
 263
 264         if (flags & BO_VMA_PINNED)
 265                 msm_gem_vma_unpin(submit->bos[i].vma);
 266
 267         if (flags & BO_OBJ_PINNED)
 268                 msm_gem_unpin_locked(obj);
 269
 270         if (flags & BO_LOCKED)
 271                 dma_resv_unlock(obj->resv);
 272 }
 273
 274 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
 275 {
 276         unsigned cleanup_flags = BO_VMA_PINNED | BO_OBJ_PINNED | BO_LOCKED;
 277         submit_cleanup_bo(submit, i, cleanup_flags);
 278
 279         if (!(submit->bos[i].flags & BO_VALID))
 280                 submit->bos[i].iova = 0;
 281 }
 282
 283 /* This is where we make sure all the bo's are reserved and pin'd: */
 284 static int submit_lock_objects(struct msm_gem_submit *submit)
 285 {
 286         int contended, slow_locked = -1, i, ret = 0;
 287
 288 retry:
 289         for (i = 0; i < submit->nr_bos; i++) {
 290                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 291
 292                 if (slow_locked == i)
 293                         slow_locked = -1;
 294
 295                 contended = i;
 296
 297                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 298                         ret = dma_resv_lock_interruptible(msm_obj->base.resv,
 299                                                           &submit->ticket);
 300                         if (ret)
 301                                 goto fail;
 302                         submit->bos[i].flags |= BO_LOCKED;
 303                 }
 304         }
 305
 306         ww_acquire_done(&submit->ticket);
 307
 308         return 0;
 309
 310 fail:
 311         if (ret == -EALREADY) {
 312                 DRM_ERROR("handle %u at index %u already on submit list\n",
 313                                 submit->bos[i].handle, i);
 314                 ret = -EINVAL;
 315         }
 316
 317         for (; i >= 0; i--)
 318                 submit_unlock_unpin_bo(submit, i);
 319
 320         if (slow_locked > 0)
 321                 submit_unlock_unpin_bo(submit, slow_locked);
 322
 323         if (ret == -EDEADLK) {
 324                 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
 325                 /* we lost out in a seqno race, lock and retry.. */
 326                 ret = dma_resv_lock_slow_interruptible(msm_obj->base.resv,
 327                                                        &submit->ticket);
 328                 if (!ret) {
 329                         submit->bos[contended].flags |= BO_LOCKED;
 330                         slow_locked = contended;
 331                         goto retry;
 332                 }
 333
 334                 /* Not expecting -EALREADY here, if the bo was already
 335                  * locked, we should have gotten -EALREADY already from
 336                  * the dma_resv_lock_interruptable() call.
 337                  */
 338                 WARN_ON_ONCE(ret == -EALREADY);
 339         }
 340
 341         return ret;
 342 }
 343
 344 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
 345 {
 346         int i, ret = 0;
 347
 348         for (i = 0; i < submit->nr_bos; i++) {
 349                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 350                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 351
 352                 /* NOTE: _reserve_shared() must happen before
 353                  * _add_shared_fence(), which makes this a slightly
 354                  * strange place to call it.  OTOH this is a
 355                  * convenient can-fail point to hook it in.
 356                  */
 357                 ret = dma_resv_reserve_fences(obj->resv, 1);
 358                 if (ret)
 359                         return ret;
 360
 361                 /* If userspace has determined that explicit fencing is
 362                  * used, it can disable implicit sync on the entire
 363                  * submit:
 364                  */
 365                 if (no_implicit)
 366                         continue;
 367
 368                 /* Otherwise userspace can ask for implicit sync to be
 369                  * disabled on specific buffers.  This is useful for internal
 370                  * usermode driver managed buffers, suballocation, etc.
 371                  */
 372                 if (submit->bos[i].flags & MSM_SUBMIT_BO_NO_IMPLICIT)
 373                         continue;
 374
 375                 ret = drm_sched_job_add_implicit_dependencies(&submit->base,
 376                                                               obj,
 377                                                               write);
 378                 if (ret)
 379                         break;
 380         }
 381
 382         return ret;
 383 }
 384
 385 static int submit_pin_objects(struct msm_gem_submit *submit)
 386 {
 387         int i, ret = 0;
 388
 389         submit->valid = true;
 390
 391         for (i = 0; i < submit->nr_bos; i++) {
 392                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 393                 struct msm_gem_vma *vma;
 394
 395                 /* if locking succeeded, pin bo: */
 396                 vma = msm_gem_get_vma_locked(obj, submit->aspace);
 397                 if (IS_ERR(vma)) {
 398                         ret = PTR_ERR(vma);
 399                         break;
 400                 }
 401
 402                 ret = msm_gem_pin_vma_locked(obj, vma);
 403                 if (ret)
 404                         break;
 405
 406                 submit->bos[i].flags |= BO_OBJ_PINNED | BO_VMA_PINNED;
 407                 submit->bos[i].vma = vma;
 408
 409                 if (vma->iova == submit->bos[i].iova) {
 410                         submit->bos[i].flags |= BO_VALID;
 411                 } else {
 412                         submit->bos[i].iova = vma->iova;
 413                         /* iova changed, so address in cmdstream is not valid: */
 414                         submit->bos[i].flags &= ~BO_VALID;
 415                         submit->valid = false;
 416                 }
 417         }
 418
 419         return ret;
 420 }
 421
 422 static void submit_attach_object_fences(struct msm_gem_submit *submit)
 423 {
 424         int i;
 425
 426         for (i = 0; i < submit->nr_bos; i++) {
 427                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 428
 429                 if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 430                         dma_resv_add_fence(obj->resv, submit->user_fence,
 431                                            DMA_RESV_USAGE_WRITE);
 432                 else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
 433                         dma_resv_add_fence(obj->resv, submit->user_fence,
 434                                            DMA_RESV_USAGE_READ);
 435         }
 436 }
 437
 438 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 439                 struct msm_gem_object **obj, uint64_t *iova, bool *valid)
 440 {
 441         if (idx >= submit->nr_bos) {
 442                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 443                                 idx, submit->nr_bos);
 444                 return -EINVAL;
 445         }
 446
 447         if (obj)
 448                 *obj = submit->bos[idx].obj;
 449         if (iova)
 450                 *iova = submit->bos[idx].iova;
 451         if (valid)
 452                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 453
 454         return 0;
 455 }
 456
 457 /* process the reloc's and patch up the cmdstream as needed: */
 458 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
 459                 uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
 460 {
 461         uint32_t i, last_offset = 0;
 462         uint32_t *ptr;
 463         int ret = 0;
 464
 465         if (!nr_relocs)
 466                 return 0;
 467
 468         if (offset % 4) {
 469                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 470                 return -EINVAL;
 471         }
 472
 473         /* For now, just map the entire thing.  Eventually we probably
 474          * to do it page-by-page, w/ kmap() if not vmap()d..
 475          */
 476         ptr = msm_gem_get_vaddr_locked(&obj->base);
 477
 478         if (IS_ERR(ptr)) {
 479                 ret = PTR_ERR(ptr);
 480                 DBG("failed to map: %d", ret);
 481                 return ret;
 482         }
 483
 484         for (i = 0; i < nr_relocs; i++) {
 485                 struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
 486                 uint32_t off;
 487                 uint64_t iova;
 488                 bool valid;
 489
 490                 if (submit_reloc.submit_offset % 4) {
 491                         DRM_ERROR("non-aligned reloc offset: %u\n",
 492                                         submit_reloc.submit_offset);
 493                         ret = -EINVAL;
 494                         goto out;
 495                 }
 496
 497                 /* offset in dwords: */
 498                 off = submit_reloc.submit_offset / 4;
 499
 500                 if ((off >= (obj->base.size / 4)) ||
 501                                 (off < last_offset)) {
 502                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 503                         ret = -EINVAL;
 504                         goto out;
 505                 }
 506
 507                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 508                 if (ret)
 509                         goto out;
 510
 511                 if (valid)
 512                         continue;
 513
 514                 iova += submit_reloc.reloc_offset;
 515
 516                 if (submit_reloc.shift < 0)
 517                         iova >>= -submit_reloc.shift;
 518                 else
 519                         iova <<= submit_reloc.shift;
 520
 521                 ptr[off] = iova | submit_reloc.or;
 522
 523                 last_offset = off;
 524         }
 525
 526 out:
 527         msm_gem_put_vaddr_locked(&obj->base);
 528
 529         return ret;
 530 }
 531
 532 /* Cleanup submit at end of ioctl.  In the error case, this also drops
 533  * references, unpins, and drops active refcnt.  In the non-error case,
 534  * this is done when the submit is retired.
 535  */
 536 static void submit_cleanup(struct msm_gem_submit *submit, bool error)
 537 {
 538         unsigned cleanup_flags = BO_LOCKED;
 539         unsigned i;
 540
 541         if (error)
 542                 cleanup_flags |= BO_VMA_PINNED | BO_OBJ_PINNED;
 543
 544         for (i = 0; i < submit->nr_bos; i++) {
 545                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 546                 submit_cleanup_bo(submit, i, cleanup_flags);
 547                 if (error)
 548                         drm_gem_object_put(&msm_obj->base);
 549         }
 550 }
 551
 552 void msm_submit_retire(struct msm_gem_submit *submit)
 553 {
 554         int i;
 555
 556         for (i = 0; i < submit->nr_bos; i++) {
 557                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 558
 559                 drm_gem_object_put(obj);
 560         }
 561 }
 562
 563 struct msm_submit_post_dep {
 564         struct drm_syncobj *syncobj;
 565         uint64_t point;
 566         struct dma_fence_chain *chain;
 567 };
 568
 569 static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
 570                                            struct drm_file *file,
 571                                            uint64_t in_syncobjs_addr,
 572                                            uint32_t nr_in_syncobjs,
 573                                            size_t syncobj_stride)
 574 {
 575         struct drm_syncobj **syncobjs = NULL;
 576         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 577         int ret = 0;
 578         uint32_t i, j;
 579
 580         syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
 581                            GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 582         if (!syncobjs)
 583                 return ERR_PTR(-ENOMEM);
 584
 585         for (i = 0; i < nr_in_syncobjs; ++i) {
 586                 uint64_t address = in_syncobjs_addr + i * syncobj_stride;
 587
 588                 if (copy_from_user(&syncobj_desc,
 589                                    u64_to_user_ptr(address),
 590                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 591                         ret = -EFAULT;
 592                         break;
 593                 }
 594
 595                 if (syncobj_desc.point &&
 596                     !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
 597                         ret = -EOPNOTSUPP;
 598                         break;
 599                 }
 600
 601                 if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
 602                         ret = -EINVAL;
 603                         break;
 604                 }
 605
 606                 ret = drm_sched_job_add_syncobj_dependency(&submit->base, file,
 607                                                            syncobj_desc.handle, syncobj_desc.point);
 608                 if (ret)
 609                         break;
 610
 611                 if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
 612                         syncobjs[i] =
 613                                 drm_syncobj_find(file, syncobj_desc.handle);
 614                         if (!syncobjs[i]) {
 615                                 ret = -EINVAL;
 616                                 break;
 617                         }
 618                 }
 619         }
 620
 621         if (ret) {
 622                 for (j = 0; j <= i; ++j) {
 623                         if (syncobjs[j])
 624                                 drm_syncobj_put(syncobjs[j]);
 625                 }
 626                 kfree(syncobjs);
 627                 return ERR_PTR(ret);
 628         }
 629         return syncobjs;
 630 }
 631
 632 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
 633                                uint32_t nr_syncobjs)
 634 {
 635         uint32_t i;
 636
 637         for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
 638                 if (syncobjs[i])
 639                         drm_syncobj_replace_fence(syncobjs[i], NULL);
 640         }
 641 }
 642
 643 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
 644                                                        struct drm_file *file,
 645                                                        uint64_t syncobjs_addr,
 646                                                        uint32_t nr_syncobjs,
 647                                                        size_t syncobj_stride)
 648 {
 649         struct msm_submit_post_dep *post_deps;
 650         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 651         int ret = 0;
 652         uint32_t i, j;
 653
 654         post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
 655                             GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 656         if (!post_deps)
 657                 return ERR_PTR(-ENOMEM);
 658
 659         for (i = 0; i < nr_syncobjs; ++i) {
 660                 uint64_t address = syncobjs_addr + i * syncobj_stride;
 661
 662                 if (copy_from_user(&syncobj_desc,
 663                                    u64_to_user_ptr(address),
 664                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 665                         ret = -EFAULT;
 666                         break;
 667                 }
 668
 669                 post_deps[i].point = syncobj_desc.point;
 670
 671                 if (syncobj_desc.flags) {
 672                         ret = -EINVAL;
 673                         break;
 674                 }
 675
 676                 if (syncobj_desc.point) {
 677                         if (!drm_core_check_feature(dev,
 678                                                     DRIVER_SYNCOBJ_TIMELINE)) {
 679                                 ret = -EOPNOTSUPP;
 680                                 break;
 681                         }
 682
 683                         post_deps[i].chain = dma_fence_chain_alloc();
 684                         if (!post_deps[i].chain) {
 685                                 ret = -ENOMEM;
 686                                 break;
 687                         }
 688                 }
 689
 690                 post_deps[i].syncobj =
 691                         drm_syncobj_find(file, syncobj_desc.handle);
 692                 if (!post_deps[i].syncobj) {
 693                         ret = -EINVAL;
 694                         break;
 695                 }
 696         }
 697
 698         if (ret) {
 699                 for (j = 0; j <= i; ++j) {
 700                         dma_fence_chain_free(post_deps[j].chain);
 701                         if (post_deps[j].syncobj)
 702                                 drm_syncobj_put(post_deps[j].syncobj);
 703                 }
 704
 705                 kfree(post_deps);
 706                 return ERR_PTR(ret);
 707         }
 708
 709         return post_deps;
 710 }
 711
 712 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
 713                                   uint32_t count, struct dma_fence *fence)
 714 {
 715         uint32_t i;
 716
 717         for (i = 0; post_deps && i < count; ++i) {
 718                 if (post_deps[i].chain) {
 719                         drm_syncobj_add_point(post_deps[i].syncobj,
 720                                               post_deps[i].chain,
 721                                               fence, post_deps[i].point);
 722                         post_deps[i].chain = NULL;
 723                 } else {
 724                         drm_syncobj_replace_fence(post_deps[i].syncobj,
 725                                                   fence);
 726                 }
 727         }
 728 }
 729
 730 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 731                 struct drm_file *file)
 732 {
 733         struct msm_drm_private *priv = dev->dev_private;
 734         struct drm_msm_gem_submit *args = data;
 735         struct msm_file_private *ctx = file->driver_priv;
 736         struct msm_gem_submit *submit = NULL;
 737         struct msm_gpu *gpu = priv->gpu;
 738         struct msm_gpu_submitqueue *queue;
 739         struct msm_ringbuffer *ring;
 740         struct msm_submit_post_dep *post_deps = NULL;
 741         struct drm_syncobj **syncobjs_to_reset = NULL;
 742         int out_fence_fd = -1;
 743         bool has_ww_ticket = false;
 744         unsigned i;
 745         int ret;
 746
 747         if (!gpu)
 748                 return -ENXIO;
 749
 750         if (args->pad)
 751                 return -EINVAL;
 752
 753         if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
 754                 DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
 755                 return -EPERM;
 756         }
 757
 758         /* for now, we just have 3d pipe.. eventually this would need to
 759          * be more clever to dispatch to appropriate gpu module:
 760          */
 761         if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
 762                 return -EINVAL;
 763
 764         if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
 765                 return -EINVAL;
 766
 767         if (args->flags & MSM_SUBMIT_SUDO) {
 768                 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
 769                     !capable(CAP_SYS_RAWIO))
 770                         return -EINVAL;
 771         }
 772
 773         queue = msm_submitqueue_get(ctx, args->queueid);
 774         if (!queue)
 775                 return -ENOENT;
 776
 777         ring = gpu->rb[queue->ring_nr];
 778
 779         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 780                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 781                 if (out_fence_fd < 0) {
 782                         ret = out_fence_fd;
 783                         goto out_post_unlock;
 784                 }
 785         }
 786
 787         submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
 788         if (IS_ERR(submit)) {
 789                 ret = PTR_ERR(submit);
 790                 goto out_post_unlock;
 791         }
 792
 793         trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
 794                 args->nr_bos, args->nr_cmds);
 795
 796         ret = mutex_lock_interruptible(&queue->lock);
 797         if (ret)
 798                 goto out_post_unlock;
 799
 800         if (args->flags & MSM_SUBMIT_SUDO)
 801                 submit->in_rb = true;
 802
 803         if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
 804                 struct dma_fence *in_fence;
 805
 806                 in_fence = sync_file_get_fence(args->fence_fd);
 807
 808                 if (!in_fence) {
 809                         ret = -EINVAL;
 810                         goto out_unlock;
 811                 }
 812
 813                 ret = drm_sched_job_add_dependency(&submit->base, in_fence);
 814                 if (ret)
 815                         goto out_unlock;
 816         }
 817
 818         if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
 819                 syncobjs_to_reset = msm_parse_deps(submit, file,
 820                                                    args->in_syncobjs,
 821                                                    args->nr_in_syncobjs,
 822                                                    args->syncobj_stride);
 823                 if (IS_ERR(syncobjs_to_reset)) {
 824                         ret = PTR_ERR(syncobjs_to_reset);
 825                         goto out_unlock;
 826                 }
 827         }
 828
 829         if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
 830                 post_deps = msm_parse_post_deps(dev, file,
 831                                                 args->out_syncobjs,
 832                                                 args->nr_out_syncobjs,
 833                                                 args->syncobj_stride);
 834                 if (IS_ERR(post_deps)) {
 835                         ret = PTR_ERR(post_deps);
 836                         goto out_unlock;
 837                 }
 838         }
 839
 840         ret = submit_lookup_objects(submit, args, file);
 841         if (ret)
 842                 goto out;
 843
 844         ret = submit_lookup_cmds(submit, args, file);
 845         if (ret)
 846                 goto out;
 847
 848         /* copy_*_user while holding a ww ticket upsets lockdep */
 849         ww_acquire_init(&submit->ticket, &reservation_ww_class);
 850         has_ww_ticket = true;
 851         ret = submit_lock_objects(submit);
 852         if (ret)
 853                 goto out;
 854
 855         ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
 856         if (ret)
 857                 goto out;
 858
 859         ret = submit_pin_objects(submit);
 860         if (ret)
 861                 goto out;
 862
 863         for (i = 0; i < args->nr_cmds; i++) {
 864                 struct msm_gem_object *msm_obj;
 865                 uint64_t iova;
 866
 867                 ret = submit_bo(submit, submit->cmd[i].idx,
 868                                 &msm_obj, &iova, NULL);
 869                 if (ret)
 870                         goto out;
 871
 872                 if (!submit->cmd[i].size ||
 873                         ((submit->cmd[i].size + submit->cmd[i].offset) >
 874                                 msm_obj->base.size / 4)) {
 875                         DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
 876                         ret = -EINVAL;
 877                         goto out;
 878                 }
 879
 880                 submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
 881
 882                 if (submit->valid)
 883                         continue;
 884
 885                 ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4,
 886                                 submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
 887                 if (ret)
 888                         goto out;
 889         }
 890
 891         submit->nr_cmds = i;
 892
 893         idr_preload(GFP_KERNEL);
 894
 895         spin_lock(&queue->idr_lock);
 896
 897         /*
 898          * If using userspace provided seqno fence, validate that the id
 899          * is available before arming sched job.  Since access to fence_idr
 900          * is serialized on the queue lock, the slot should be still avail
 901          * after the job is armed
 902          */
 903         if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
 904                         (!args->fence || idr_find(&queue->fence_idr, args->fence))) {
 905                 spin_unlock(&queue->idr_lock);
 906                 idr_preload_end();
 907                 ret = -EINVAL;
 908                 goto out;
 909         }
 910
 911         drm_sched_job_arm(&submit->base);
 912
 913         submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);
 914
 915         if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
 916                 /*
 917                  * Userspace has assigned the seqno fence that it wants
 918                  * us to use.  It is an error to pick a fence sequence
 919                  * number that is not available.
 920                  */
 921                 submit->fence_id = args->fence;
 922                 ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
 923                                     &submit->fence_id, submit->fence_id,
 924                                     GFP_NOWAIT);
 925                 /*
 926                  * We've already validated that the fence_id slot is valid,
 927                  * so if idr_alloc_u32 failed, it is a kernel bug
 928                  */
 929                 WARN_ON(ret);
 930         } else {
 931                 /*
 932                  * Allocate an id which can be used by WAIT_FENCE ioctl to map
 933                  * back to the underlying fence.
 934                  */
 935                 submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
 936                                                     submit->user_fence, 1,
 937                                                     INT_MAX, GFP_NOWAIT);
 938         }
 939
 940         spin_unlock(&queue->idr_lock);
 941         idr_preload_end();
 942
 943         if (submit->fence_id < 0) {
 944                 ret = submit->fence_id;
 945                 submit->fence_id = 0;
 946         }
 947
 948         if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 949                 struct sync_file *sync_file = sync_file_create(submit->user_fence);
 950                 if (!sync_file) {
 951                         ret = -ENOMEM;
 952                 } else {
 953                         fd_install(out_fence_fd, sync_file->file);
 954                         args->fence_fd = out_fence_fd;
 955                 }
 956         }
 957
 958         submit_attach_object_fences(submit);
 959
 960         /* The scheduler owns a ref now: */
 961         msm_gem_submit_get(submit);
 962
 963         msm_rd_dump_submit(priv->rd, submit, NULL);
 964
 965         drm_sched_entity_push_job(&submit->base);
 966
 967         args->fence = submit->fence_id;
 968         queue->last_fence = submit->fence_id;
 969
 970         msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
 971         msm_process_post_deps(post_deps, args->nr_out_syncobjs,
 972                               submit->user_fence);
 973
 974
 975 out:
 976         submit_cleanup(submit, !!ret);
 977         if (has_ww_ticket)
 978                 ww_acquire_fini(&submit->ticket);
 979 out_unlock:
 980         mutex_unlock(&queue->lock);
 981 out_post_unlock:
 982         if (ret && (out_fence_fd >= 0))
 983                 put_unused_fd(out_fence_fd);
 984
 985         if (!IS_ERR_OR_NULL(submit)) {
 986                 msm_gem_submit_put(submit);
 987         } else {
 988                 /*
 989                  * If the submit hasn't yet taken ownership of the queue
 990                  * then we need to drop the reference ourself:
 991                  */
 992                 msm_submitqueue_put(queue);
 993         }
 994         if (!IS_ERR_OR_NULL(post_deps)) {
 995                 for (i = 0; i < args->nr_out_syncobjs; ++i) {
 996                         kfree(post_deps[i].chain);
 997                         drm_syncobj_put(post_deps[i].syncobj);
 998                 }
 999                 kfree(post_deps);
1000         }
1001
1002         if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
1003                 for (i = 0; i < args->nr_in_syncobjs; ++i) {
1004                         if (syncobjs_to_reset[i])
1005                                 drm_syncobj_put(syncobjs_to_reset[i]);
1006                 }
1007                 kfree(syncobjs_to_reset);
1008         }
1009
1010         return ret;
1011 }