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