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