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