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 = 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;
 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_PINNED)
 265                 msm_gem_unpin_locked(obj);
 266
 267         if (flags & BO_LOCKED)
 268                 dma_resv_unlock(obj->resv);
 269 }
 270
 271 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
 272 {
 273         unsigned cleanup_flags = BO_PINNED | BO_LOCKED;
 274         submit_cleanup_bo(submit, i, cleanup_flags);
 275
 276         if (!(submit->bos[i].flags & BO_VALID))
 277                 submit->bos[i].iova = 0;
 278 }
 279
 280 /* This is where we make sure all the bo's are reserved and pin'd: */
 281 static int submit_lock_objects(struct msm_gem_submit *submit)
 282 {
 283         int contended, slow_locked = -1, i, ret = 0;
 284
 285 retry:
 286         for (i = 0; i < submit->nr_bos; i++) {
 287                 struct drm_gem_object *obj = submit->bos[i].obj;
 288
 289                 if (slow_locked == i)
 290                         slow_locked = -1;
 291
 292                 contended = i;
 293
 294                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 295                         ret = dma_resv_lock_interruptible(obj->resv,
 296                                                           &submit->ticket);
 297                         if (ret)
 298                                 goto fail;
 299                         submit->bos[i].flags |= BO_LOCKED;
 300                 }
 301         }
 302
 303         ww_acquire_done(&submit->ticket);
 304
 305         return 0;
 306
 307 fail:
 308         if (ret == -EALREADY) {
 309                 DRM_ERROR("handle %u at index %u already on submit list\n",
 310                                 submit->bos[i].handle, i);
 311                 ret = -EINVAL;
 312         }
 313
 314         for (; i >= 0; i--)
 315                 submit_unlock_unpin_bo(submit, i);
 316
 317         if (slow_locked > 0)
 318                 submit_unlock_unpin_bo(submit, slow_locked);
 319
 320         if (ret == -EDEADLK) {
 321                 struct drm_gem_object *obj = submit->bos[contended].obj;
 322                 /* we lost out in a seqno race, lock and retry.. */
 323                 ret = dma_resv_lock_slow_interruptible(obj->resv,
 324                                                        &submit->ticket);
 325                 if (!ret) {
 326                         submit->bos[contended].flags |= BO_LOCKED;
 327                         slow_locked = contended;
 328                         goto retry;
 329                 }
 330
 331                 /* Not expecting -EALREADY here, if the bo was already
 332                  * locked, we should have gotten -EALREADY already from
 333                  * the dma_resv_lock_interruptable() call.
 334                  */
 335                 WARN_ON_ONCE(ret == -EALREADY);
 336         }
 337
 338         return ret;
 339 }
 340
 341 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
 342 {
 343         int i, ret = 0;
 344
 345         for (i = 0; i < submit->nr_bos; i++) {
 346                 struct drm_gem_object *obj = submit->bos[i].obj;
 347                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 348
 349                 /* NOTE: _reserve_shared() must happen before
 350                  * _add_shared_fence(), which makes this a slightly
 351                  * strange place to call it.  OTOH this is a
 352                  * convenient can-fail point to hook it in.
 353                  */
 354                 ret = dma_resv_reserve_fences(obj->resv, 1);
 355                 if (ret)
 356                         return ret;
 357
 358                 /* If userspace has determined that explicit fencing is
 359                  * used, it can disable implicit sync on the entire
 360                  * submit:
 361                  */
 362                 if (no_implicit)
 363                         continue;
 364
 365                 /* Otherwise userspace can ask for implicit sync to be
 366                  * disabled on specific buffers.  This is useful for internal
 367                  * usermode driver managed buffers, suballocation, etc.
 368                  */
 369                 if (submit->bos[i].flags & MSM_SUBMIT_BO_NO_IMPLICIT)
 370                         continue;
 371
 372                 ret = drm_sched_job_add_implicit_dependencies(&submit->base,
 373                                                               obj,
 374                                                               write);
 375                 if (ret)
 376                         break;
 377         }
 378
 379         return ret;
 380 }
 381
 382 static int submit_pin_objects(struct msm_gem_submit *submit)
 383 {
 384         struct msm_drm_private *priv = submit->dev->dev_private;
 385         int i, ret = 0;
 386
 387         submit->valid = true;
 388
 389         for (i = 0; i < submit->nr_bos; i++) {
 390                 struct drm_gem_object *obj = submit->bos[i].obj;
 391                 struct msm_gem_vma *vma;
 392
 393                 /* if locking succeeded, pin bo: */
 394                 vma = msm_gem_get_vma_locked(obj, submit->aspace);
 395                 if (IS_ERR(vma)) {
 396                         ret = PTR_ERR(vma);
 397                         break;
 398                 }
 399
 400                 ret = msm_gem_pin_vma_locked(obj, vma);
 401                 if (ret)
 402                         break;
 403
 404                 if (vma->iova == submit->bos[i].iova) {
 405                         submit->bos[i].flags |= BO_VALID;
 406                 } else {
 407                         submit->bos[i].iova = vma->iova;
 408                         /* iova changed, so address in cmdstream is not valid: */
 409                         submit->bos[i].flags &= ~BO_VALID;
 410                         submit->valid = false;
 411                 }
 412         }
 413
 414         /*
 415          * A second loop while holding the LRU lock (a) avoids acquiring/dropping
 416          * the LRU lock for each individual bo, while (b) avoiding holding the
 417          * LRU lock while calling msm_gem_pin_vma_locked() (which could trigger
 418          * get_pages() which could trigger reclaim.. and if we held the LRU lock
 419          * could trigger deadlock with the shrinker).
 420          */
 421         mutex_lock(&priv->lru.lock);
 422         for (i = 0; i < submit->nr_bos; i++) {
 423                 msm_gem_pin_obj_locked(submit->bos[i].obj);
 424                 submit->bos[i].flags |= BO_PINNED;
 425         }
 426         mutex_unlock(&priv->lru.lock);
 427
 428         return ret;
 429 }
 430
 431 static void submit_attach_object_fences(struct msm_gem_submit *submit)
 432 {
 433         int i;
 434
 435         for (i = 0; i < submit->nr_bos; i++) {
 436                 struct drm_gem_object *obj = submit->bos[i].obj;
 437
 438                 if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 439                         dma_resv_add_fence(obj->resv, submit->user_fence,
 440                                            DMA_RESV_USAGE_WRITE);
 441                 else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
 442                         dma_resv_add_fence(obj->resv, submit->user_fence,
 443                                            DMA_RESV_USAGE_READ);
 444         }
 445 }
 446
 447 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 448                 struct drm_gem_object **obj, uint64_t *iova, bool *valid)
 449 {
 450         if (idx >= submit->nr_bos) {
 451                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 452                                 idx, submit->nr_bos);
 453                 return -EINVAL;
 454         }
 455
 456         if (obj)
 457                 *obj = submit->bos[idx].obj;
 458         if (iova)
 459                 *iova = submit->bos[idx].iova;
 460         if (valid)
 461                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 462
 463         return 0;
 464 }
 465
 466 /* process the reloc's and patch up the cmdstream as needed: */
 467 static int submit_reloc(struct msm_gem_submit *submit, struct drm_gem_object *obj,
 468                 uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
 469 {
 470         uint32_t i, last_offset = 0;
 471         uint32_t *ptr;
 472         int ret = 0;
 473
 474         if (!nr_relocs)
 475                 return 0;
 476
 477         if (offset % 4) {
 478                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 479                 return -EINVAL;
 480         }
 481
 482         /* For now, just map the entire thing.  Eventually we probably
 483          * to do it page-by-page, w/ kmap() if not vmap()d..
 484          */
 485         ptr = msm_gem_get_vaddr_locked(obj);
 486
 487         if (IS_ERR(ptr)) {
 488                 ret = PTR_ERR(ptr);
 489                 DBG("failed to map: %d", ret);
 490                 return ret;
 491         }
 492
 493         for (i = 0; i < nr_relocs; i++) {
 494                 struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
 495                 uint32_t off;
 496                 uint64_t iova;
 497                 bool valid;
 498
 499                 if (submit_reloc.submit_offset % 4) {
 500                         DRM_ERROR("non-aligned reloc offset: %u\n",
 501                                         submit_reloc.submit_offset);
 502                         ret = -EINVAL;
 503                         goto out;
 504                 }
 505
 506                 /* offset in dwords: */
 507                 off = submit_reloc.submit_offset / 4;
 508
 509                 if ((off >= (obj->size / 4)) ||
 510                                 (off < last_offset)) {
 511                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 512                         ret = -EINVAL;
 513                         goto out;
 514                 }
 515
 516                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 517                 if (ret)
 518                         goto out;
 519
 520                 if (valid)
 521                         continue;
 522
 523                 iova += submit_reloc.reloc_offset;
 524
 525                 if (submit_reloc.shift < 0)
 526                         iova >>= -submit_reloc.shift;
 527                 else
 528                         iova <<= submit_reloc.shift;
 529
 530                 ptr[off] = iova | submit_reloc.or;
 531
 532                 last_offset = off;
 533         }
 534
 535 out:
 536         msm_gem_put_vaddr_locked(obj);
 537
 538         return ret;
 539 }
 540
 541 /* Cleanup submit at end of ioctl.  In the error case, this also drops
 542  * references, unpins, and drops active refcnt.  In the non-error case,
 543  * this is done when the submit is retired.
 544  */
 545 static void submit_cleanup(struct msm_gem_submit *submit, bool error)
 546 {
 547         unsigned cleanup_flags = BO_LOCKED;
 548         unsigned i;
 549
 550         if (error)
 551                 cleanup_flags |= BO_PINNED;
 552
 553         for (i = 0; i < submit->nr_bos; i++) {
 554                 struct drm_gem_object *obj = submit->bos[i].obj;
 555                 submit_cleanup_bo(submit, i, cleanup_flags);
 556                 if (error)
 557                         drm_gem_object_put(obj);
 558         }
 559 }
 560
 561 void msm_submit_retire(struct msm_gem_submit *submit)
 562 {
 563         int i;
 564
 565         for (i = 0; i < submit->nr_bos; i++) {
 566                 struct drm_gem_object *obj = submit->bos[i].obj;
 567
 568                 drm_gem_object_put(obj);
 569         }
 570 }
 571
 572 struct msm_submit_post_dep {
 573         struct drm_syncobj *syncobj;
 574         uint64_t point;
 575         struct dma_fence_chain *chain;
 576 };
 577
 578 static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
 579                                            struct drm_file *file,
 580                                            uint64_t in_syncobjs_addr,
 581                                            uint32_t nr_in_syncobjs,
 582                                            size_t syncobj_stride)
 583 {
 584         struct drm_syncobj **syncobjs = NULL;
 585         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 586         int ret = 0;
 587         uint32_t i, j;
 588
 589         syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
 590                            GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 591         if (!syncobjs)
 592                 return ERR_PTR(-ENOMEM);
 593
 594         for (i = 0; i < nr_in_syncobjs; ++i) {
 595                 uint64_t address = in_syncobjs_addr + i * syncobj_stride;
 596
 597                 if (copy_from_user(&syncobj_desc,
 598                                    u64_to_user_ptr(address),
 599                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 600                         ret = -EFAULT;
 601                         break;
 602                 }
 603
 604                 if (syncobj_desc.point &&
 605                     !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
 606                         ret = -EOPNOTSUPP;
 607                         break;
 608                 }
 609
 610                 if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
 611                         ret = -EINVAL;
 612                         break;
 613                 }
 614
 615                 ret = drm_sched_job_add_syncobj_dependency(&submit->base, file,
 616                                                            syncobj_desc.handle, syncobj_desc.point);
 617                 if (ret)
 618                         break;
 619
 620                 if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
 621                         syncobjs[i] =
 622                                 drm_syncobj_find(file, syncobj_desc.handle);
 623                         if (!syncobjs[i]) {
 624                                 ret = -EINVAL;
 625                                 break;
 626                         }
 627                 }
 628         }
 629
 630         if (ret) {
 631                 for (j = 0; j <= i; ++j) {
 632                         if (syncobjs[j])
 633                                 drm_syncobj_put(syncobjs[j]);
 634                 }
 635                 kfree(syncobjs);
 636                 return ERR_PTR(ret);
 637         }
 638         return syncobjs;
 639 }
 640
 641 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
 642                                uint32_t nr_syncobjs)
 643 {
 644         uint32_t i;
 645
 646         for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
 647                 if (syncobjs[i])
 648                         drm_syncobj_replace_fence(syncobjs[i], NULL);
 649         }
 650 }
 651
 652 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
 653                                                        struct drm_file *file,
 654                                                        uint64_t syncobjs_addr,
 655                                                        uint32_t nr_syncobjs,
 656                                                        size_t syncobj_stride)
 657 {
 658         struct msm_submit_post_dep *post_deps;
 659         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 660         int ret = 0;
 661         uint32_t i, j;
 662
 663         post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
 664                             GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 665         if (!post_deps)
 666                 return ERR_PTR(-ENOMEM);
 667
 668         for (i = 0; i < nr_syncobjs; ++i) {
 669                 uint64_t address = syncobjs_addr + i * syncobj_stride;
 670
 671                 if (copy_from_user(&syncobj_desc,
 672                                    u64_to_user_ptr(address),
 673                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 674                         ret = -EFAULT;
 675                         break;
 676                 }
 677
 678                 post_deps[i].point = syncobj_desc.point;
 679
 680                 if (syncobj_desc.flags) {
 681                         ret = -EINVAL;
 682                         break;
 683                 }
 684
 685                 if (syncobj_desc.point) {
 686                         if (!drm_core_check_feature(dev,
 687                                                     DRIVER_SYNCOBJ_TIMELINE)) {
 688                                 ret = -EOPNOTSUPP;
 689                                 break;
 690                         }
 691
 692                         post_deps[i].chain = dma_fence_chain_alloc();
 693                         if (!post_deps[i].chain) {
 694                                 ret = -ENOMEM;
 695                                 break;
 696                         }
 697                 }
 698
 699                 post_deps[i].syncobj =
 700                         drm_syncobj_find(file, syncobj_desc.handle);
 701                 if (!post_deps[i].syncobj) {
 702                         ret = -EINVAL;
 703                         break;
 704                 }
 705         }
 706
 707         if (ret) {
 708                 for (j = 0; j <= i; ++j) {
 709                         dma_fence_chain_free(post_deps[j].chain);
 710                         if (post_deps[j].syncobj)
 711                                 drm_syncobj_put(post_deps[j].syncobj);
 712                 }
 713
 714                 kfree(post_deps);
 715                 return ERR_PTR(ret);
 716         }
 717
 718         return post_deps;
 719 }
 720
 721 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
 722                                   uint32_t count, struct dma_fence *fence)
 723 {
 724         uint32_t i;
 725
 726         for (i = 0; post_deps && i < count; ++i) {
 727                 if (post_deps[i].chain) {
 728                         drm_syncobj_add_point(post_deps[i].syncobj,
 729                                               post_deps[i].chain,
 730                                               fence, post_deps[i].point);
 731                         post_deps[i].chain = NULL;
 732                 } else {
 733                         drm_syncobj_replace_fence(post_deps[i].syncobj,
 734                                                   fence);
 735                 }
 736         }
 737 }
 738
 739 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 740                 struct drm_file *file)
 741 {
 742         struct msm_drm_private *priv = dev->dev_private;
 743         struct drm_msm_gem_submit *args = data;
 744         struct msm_file_private *ctx = file->driver_priv;
 745         struct msm_gem_submit *submit = NULL;
 746         struct msm_gpu *gpu = priv->gpu;
 747         struct msm_gpu_submitqueue *queue;
 748         struct msm_ringbuffer *ring;
 749         struct msm_submit_post_dep *post_deps = NULL;
 750         struct drm_syncobj **syncobjs_to_reset = NULL;
 751         int out_fence_fd = -1;
 752         bool has_ww_ticket = false;
 753         unsigned i;
 754         int ret;
 755
 756         if (!gpu)
 757                 return -ENXIO;
 758
 759         if (args->pad)
 760                 return -EINVAL;
 761
 762         if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
 763                 DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
 764                 return -EPERM;
 765         }
 766
 767         /* for now, we just have 3d pipe.. eventually this would need to
 768          * be more clever to dispatch to appropriate gpu module:
 769          */
 770         if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
 771                 return -EINVAL;
 772
 773         if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
 774                 return -EINVAL;
 775
 776         if (args->flags & MSM_SUBMIT_SUDO) {
 777                 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
 778                     !capable(CAP_SYS_RAWIO))
 779                         return -EINVAL;
 780         }
 781
 782         queue = msm_submitqueue_get(ctx, args->queueid);
 783         if (!queue)
 784                 return -ENOENT;
 785
 786         ring = gpu->rb[queue->ring_nr];
 787
 788         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 789                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 790                 if (out_fence_fd < 0) {
 791                         ret = out_fence_fd;
 792                         goto out_post_unlock;
 793                 }
 794         }
 795
 796         submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
 797         if (IS_ERR(submit)) {
 798                 ret = PTR_ERR(submit);
 799                 goto out_post_unlock;
 800         }
 801
 802         trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
 803                 args->nr_bos, args->nr_cmds);
 804
 805         ret = mutex_lock_interruptible(&queue->lock);
 806         if (ret)
 807                 goto out_post_unlock;
 808
 809         if (args->flags & MSM_SUBMIT_SUDO)
 810                 submit->in_rb = true;
 811
 812         if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
 813                 struct dma_fence *in_fence;
 814
 815                 in_fence = sync_file_get_fence(args->fence_fd);
 816
 817                 if (!in_fence) {
 818                         ret = -EINVAL;
 819                         goto out_unlock;
 820                 }
 821
 822                 ret = drm_sched_job_add_dependency(&submit->base, in_fence);
 823                 if (ret)
 824                         goto out_unlock;
 825         }
 826
 827         if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
 828                 syncobjs_to_reset = msm_parse_deps(submit, file,
 829                                                    args->in_syncobjs,
 830                                                    args->nr_in_syncobjs,
 831                                                    args->syncobj_stride);
 832                 if (IS_ERR(syncobjs_to_reset)) {
 833                         ret = PTR_ERR(syncobjs_to_reset);
 834                         goto out_unlock;
 835                 }
 836         }
 837
 838         if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
 839                 post_deps = msm_parse_post_deps(dev, file,
 840                                                 args->out_syncobjs,
 841                                                 args->nr_out_syncobjs,
 842                                                 args->syncobj_stride);
 843                 if (IS_ERR(post_deps)) {
 844                         ret = PTR_ERR(post_deps);
 845                         goto out_unlock;
 846                 }
 847         }
 848
 849         ret = submit_lookup_objects(submit, args, file);
 850         if (ret)
 851                 goto out;
 852
 853         ret = submit_lookup_cmds(submit, args, file);
 854         if (ret)
 855                 goto out;
 856
 857         /* copy_*_user while holding a ww ticket upsets lockdep */
 858         ww_acquire_init(&submit->ticket, &reservation_ww_class);
 859         has_ww_ticket = true;
 860         ret = submit_lock_objects(submit);
 861         if (ret)
 862                 goto out;
 863
 864         ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
 865         if (ret)
 866                 goto out;
 867
 868         ret = submit_pin_objects(submit);
 869         if (ret)
 870                 goto out;
 871
 872         for (i = 0; i < args->nr_cmds; i++) {
 873                 struct drm_gem_object *obj;
 874                 uint64_t iova;
 875
 876                 ret = submit_bo(submit, submit->cmd[i].idx,
 877                                 &obj, &iova, NULL);
 878                 if (ret)
 879                         goto out;
 880
 881                 if (!submit->cmd[i].size ||
 882                         ((submit->cmd[i].size + submit->cmd[i].offset) >
 883                                 obj->size / 4)) {
 884                         DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
 885                         ret = -EINVAL;
 886                         goto out;
 887                 }
 888
 889                 submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
 890
 891                 if (submit->valid)
 892                         continue;
 893
 894                 if (!gpu->allow_relocs) {
 895                         if (submit->cmd[i].nr_relocs) {
 896                                 DRM_ERROR("relocs not allowed\n");
 897                                 ret = -EINVAL;
 898                                 goto out;
 899                         }
 900
 901                         continue;
 902                 }
 903
 904                 ret = submit_reloc(submit, obj, submit->cmd[i].offset * 4,
 905                                 submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
 906                 if (ret)
 907                         goto out;
 908         }
 909
 910         submit->nr_cmds = i;
 911
 912         idr_preload(GFP_KERNEL);
 913
 914         spin_lock(&queue->idr_lock);
 915
 916         /*
 917          * If using userspace provided seqno fence, validate that the id
 918          * is available before arming sched job.  Since access to fence_idr
 919          * is serialized on the queue lock, the slot should be still avail
 920          * after the job is armed
 921          */
 922         if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
 923                         (!args->fence || idr_find(&queue->fence_idr, args->fence))) {
 924                 spin_unlock(&queue->idr_lock);
 925                 idr_preload_end();
 926                 ret = -EINVAL;
 927                 goto out;
 928         }
 929
 930         drm_sched_job_arm(&submit->base);
 931
 932         submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);
 933
 934         if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
 935                 /*
 936                  * Userspace has assigned the seqno fence that it wants
 937                  * us to use.  It is an error to pick a fence sequence
 938                  * number that is not available.
 939                  */
 940                 submit->fence_id = args->fence;
 941                 ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
 942                                     &submit->fence_id, submit->fence_id,
 943                                     GFP_NOWAIT);
 944                 /*
 945                  * We've already validated that the fence_id slot is valid,
 946                  * so if idr_alloc_u32 failed, it is a kernel bug
 947                  */
 948                 WARN_ON(ret);
 949         } else {
 950                 /*
 951                  * Allocate an id which can be used by WAIT_FENCE ioctl to map
 952                  * back to the underlying fence.
 953                  */
 954                 submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
 955                                                     submit->user_fence, 1,
 956                                                     INT_MAX, GFP_NOWAIT);
 957         }
 958
 959         spin_unlock(&queue->idr_lock);
 960         idr_preload_end();
 961
 962         if (submit->fence_id < 0) {
 963                 ret = submit->fence_id;
 964                 submit->fence_id = 0;
 965         }
 966
 967         if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 968                 struct sync_file *sync_file = sync_file_create(submit->user_fence);
 969                 if (!sync_file) {
 970                         ret = -ENOMEM;
 971                 } else {
 972                         fd_install(out_fence_fd, sync_file->file);
 973                         args->fence_fd = out_fence_fd;
 974                 }
 975         }
 976
 977         submit_attach_object_fences(submit);
 978
 979         /* The scheduler owns a ref now: */
 980         msm_gem_submit_get(submit);
 981
 982         msm_rd_dump_submit(priv->rd, submit, NULL);
 983
 984         drm_sched_entity_push_job(&submit->base);
 985
 986         args->fence = submit->fence_id;
 987         queue->last_fence = submit->fence_id;
 988
 989         msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
 990         msm_process_post_deps(post_deps, args->nr_out_syncobjs,
 991                               submit->user_fence);
 992
 993
 994 out:
 995         submit_cleanup(submit, !!ret);
 996         if (has_ww_ticket)
 997                 ww_acquire_fini(&submit->ticket);
 998 out_unlock:
 999         mutex_unlock(&queue->lock);
1000 out_post_unlock:
1001         if (ret && (out_fence_fd >= 0))
1002                 put_unused_fd(out_fence_fd);
1003
1004         if (!IS_ERR_OR_NULL(submit)) {
1005                 msm_gem_submit_put(submit);
1006         } else {
1007                 /*
1008                  * If the submit hasn't yet taken ownership of the queue
1009                  * then we need to drop the reference ourself:
1010                  */
1011                 msm_submitqueue_put(queue);
1012         }
1013         if (!IS_ERR_OR_NULL(post_deps)) {
1014                 for (i = 0; i < args->nr_out_syncobjs; ++i) {
1015                         kfree(post_deps[i].chain);
1016                         drm_syncobj_put(post_deps[i].syncobj);
1017                 }
1018                 kfree(post_deps);
1019         }
1020
1021         if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
1022                 for (i = 0; i < args->nr_in_syncobjs; ++i) {
1023                         if (syncobjs_to_reset[i])
1024                                 drm_syncobj_put(syncobjs_to_reset[i]);
1025                 }
1026                 kfree(syncobjs_to_reset);
1027         }
1028
1029         return ret;
1030 }