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