drivers/gpu/drm/msm/msm_gem_submit.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <linux/file.h>
   8 #include <linux/sync_file.h>
   9 #include <linux/uaccess.h>
  10
  11 #include <drm/drm_drv.h>
  12 #include <drm/drm_file.h>
  13 #include <drm/drm_syncobj.h>
  14
  15 #include "msm_drv.h"
  16 #include "msm_gpu.h"
  17 #include "msm_gem.h"
  18 #include "msm_gpu_trace.h"
  19
  20 /*
  21  * Cmdstream submission:
  22  */
  23
  24 static struct msm_gem_submit *submit_create(struct drm_device *dev,
  25                 struct msm_gpu *gpu,
  26                 struct msm_gpu_submitqueue *queue, uint32_t nr_bos,
  27                 uint32_t nr_cmds)
  28 {
  29         static atomic_t ident = ATOMIC_INIT(0);
  30         struct msm_gem_submit *submit;
  31         uint64_t sz;
  32         int ret;
  33
  34         sz = struct_size(submit, bos, nr_bos) +
  35                         ((u64)nr_cmds * sizeof(submit->cmd[0]));
  36
  37         if (sz > SIZE_MAX)
  38                 return ERR_PTR(-ENOMEM);
  39
  40         submit = kzalloc(sz, GFP_KERNEL);
  41         if (!submit)
  42                 return ERR_PTR(-ENOMEM);
  43
  44         submit->hw_fence = msm_fence_alloc();
  45         if (IS_ERR(submit->hw_fence)) {
  46                 ret = PTR_ERR(submit->hw_fence);
  47                 kfree(submit);
  48                 return ERR_PTR(ret);
  49         }
  50
  51         ret = drm_sched_job_init(&submit->base, queue->entity, queue);
  52         if (ret) {
  53                 kfree(submit->hw_fence);
  54                 kfree(submit);
  55                 return ERR_PTR(ret);
  56         }
  57
  58         kref_init(&submit->ref);
  59         submit->dev = dev;
  60         submit->aspace = queue->ctx->aspace;
  61         submit->gpu = gpu;
  62         submit->cmd = (void *)&submit->bos[nr_bos];
  63         submit->queue = queue;
  64         submit->pid = get_pid(task_pid(current));
  65         submit->ring = gpu->rb[queue->ring_nr];
  66         submit->fault_dumped = false;
  67
  68         /* Get a unique identifier for the submission for logging purposes */
  69         submit->ident = atomic_inc_return(&ident) - 1;
  70
  71         INIT_LIST_HEAD(&submit->node);
  72
  73         return submit;
  74 }
  75
  76 void __msm_gem_submit_destroy(struct kref *kref)
  77 {
  78         struct msm_gem_submit *submit =
  79                         container_of(kref, struct msm_gem_submit, ref);
  80         unsigned i;
  81
  82         if (submit->fence_id) {
  83                 spin_lock(&submit->queue->idr_lock);
  84                 idr_remove(&submit->queue->fence_idr, submit->fence_id);
  85                 spin_unlock(&submit->queue->idr_lock);
  86         }
  87
  88         dma_fence_put(submit->user_fence);
  89         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                                            struct msm_ringbuffer *ring)
 563 {
 564         struct drm_syncobj **syncobjs = NULL;
 565         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 566         int ret = 0;
 567         uint32_t i, j;
 568
 569         syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
 570                            GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 571         if (!syncobjs)
 572                 return ERR_PTR(-ENOMEM);
 573
 574         for (i = 0; i < nr_in_syncobjs; ++i) {
 575                 uint64_t address = in_syncobjs_addr + i * syncobj_stride;
 576
 577                 if (copy_from_user(&syncobj_desc,
 578                                    u64_to_user_ptr(address),
 579                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 580                         ret = -EFAULT;
 581                         break;
 582                 }
 583
 584                 if (syncobj_desc.point &&
 585                     !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
 586                         ret = -EOPNOTSUPP;
 587                         break;
 588                 }
 589
 590                 if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
 591                         ret = -EINVAL;
 592                         break;
 593                 }
 594
 595                 ret = drm_sched_job_add_syncobj_dependency(&submit->base, file,
 596                                                            syncobj_desc.handle, syncobj_desc.point);
 597                 if (ret)
 598                         break;
 599
 600                 if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
 601                         syncobjs[i] =
 602                                 drm_syncobj_find(file, syncobj_desc.handle);
 603                         if (!syncobjs[i]) {
 604                                 ret = -EINVAL;
 605                                 break;
 606                         }
 607                 }
 608         }
 609
 610         if (ret) {
 611                 for (j = 0; j <= i; ++j) {
 612                         if (syncobjs[j])
 613                                 drm_syncobj_put(syncobjs[j]);
 614                 }
 615                 kfree(syncobjs);
 616                 return ERR_PTR(ret);
 617         }
 618         return syncobjs;
 619 }
 620
 621 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
 622                                uint32_t nr_syncobjs)
 623 {
 624         uint32_t i;
 625
 626         for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
 627                 if (syncobjs[i])
 628                         drm_syncobj_replace_fence(syncobjs[i], NULL);
 629         }
 630 }
 631
 632 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
 633                                                        struct drm_file *file,
 634                                                        uint64_t syncobjs_addr,
 635                                                        uint32_t nr_syncobjs,
 636                                                        size_t syncobj_stride)
 637 {
 638         struct msm_submit_post_dep *post_deps;
 639         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 640         int ret = 0;
 641         uint32_t i, j;
 642
 643         post_deps = kcalloc(nr_syncobjs, sizeof(*post_deps),
 644                             GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 645         if (!post_deps)
 646                 return ERR_PTR(-ENOMEM);
 647
 648         for (i = 0; i < nr_syncobjs; ++i) {
 649                 uint64_t address = syncobjs_addr + i * syncobj_stride;
 650
 651                 if (copy_from_user(&syncobj_desc,
 652                                    u64_to_user_ptr(address),
 653                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 654                         ret = -EFAULT;
 655                         break;
 656                 }
 657
 658                 post_deps[i].point = syncobj_desc.point;
 659
 660                 if (syncobj_desc.flags) {
 661                         ret = -EINVAL;
 662                         break;
 663                 }
 664
 665                 if (syncobj_desc.point) {
 666                         if (!drm_core_check_feature(dev,
 667                                                     DRIVER_SYNCOBJ_TIMELINE)) {
 668                                 ret = -EOPNOTSUPP;
 669                                 break;
 670                         }
 671
 672                         post_deps[i].chain = dma_fence_chain_alloc();
 673                         if (!post_deps[i].chain) {
 674                                 ret = -ENOMEM;
 675                                 break;
 676                         }
 677                 }
 678
 679                 post_deps[i].syncobj =
 680                         drm_syncobj_find(file, syncobj_desc.handle);
 681                 if (!post_deps[i].syncobj) {
 682                         ret = -EINVAL;
 683                         break;
 684                 }
 685         }
 686
 687         if (ret) {
 688                 for (j = 0; j <= i; ++j) {
 689                         dma_fence_chain_free(post_deps[j].chain);
 690                         if (post_deps[j].syncobj)
 691                                 drm_syncobj_put(post_deps[j].syncobj);
 692                 }
 693
 694                 kfree(post_deps);
 695                 return ERR_PTR(ret);
 696         }
 697
 698         return post_deps;
 699 }
 700
 701 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
 702                                   uint32_t count, struct dma_fence *fence)
 703 {
 704         uint32_t i;
 705
 706         for (i = 0; post_deps && i < count; ++i) {
 707                 if (post_deps[i].chain) {
 708                         drm_syncobj_add_point(post_deps[i].syncobj,
 709                                               post_deps[i].chain,
 710                                               fence, post_deps[i].point);
 711                         post_deps[i].chain = NULL;
 712                 } else {
 713                         drm_syncobj_replace_fence(post_deps[i].syncobj,
 714                                                   fence);
 715                 }
 716         }
 717 }
 718
 719 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 720                 struct drm_file *file)
 721 {
 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;
 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         bool has_ww_ticket = false;
 733         unsigned i;
 734         int ret;
 735
 736         if (!gpu)
 737                 return -ENXIO;
 738
 739         if (args->pad)
 740                 return -EINVAL;
 741
 742         if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
 743                 DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
 744                 return -EPERM;
 745         }
 746
 747         /* for now, we just have 3d pipe.. eventually this would need to
 748          * be more clever to dispatch to appropriate gpu module:
 749          */
 750         if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
 751                 return -EINVAL;
 752
 753         if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
 754                 return -EINVAL;
 755
 756         if (args->flags & MSM_SUBMIT_SUDO) {
 757                 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
 758                     !capable(CAP_SYS_RAWIO))
 759                         return -EINVAL;
 760         }
 761
 762         queue = msm_submitqueue_get(ctx, args->queueid);
 763         if (!queue)
 764                 return -ENOENT;
 765
 766         ring = gpu->rb[queue->ring_nr];
 767
 768         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 769                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 770                 if (out_fence_fd < 0) {
 771                         ret = out_fence_fd;
 772                         return ret;
 773                 }
 774         }
 775
 776         submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
 777         if (IS_ERR(submit))
 778                 return PTR_ERR(submit);
 779
 780         trace_msm_gpu_submit(pid_nr(submit->pid), ring->id, submit->ident,
 781                 args->nr_bos, args->nr_cmds);
 782
 783         ret = mutex_lock_interruptible(&queue->lock);
 784         if (ret)
 785                 goto out_post_unlock;
 786
 787         if (args->flags & MSM_SUBMIT_SUDO)
 788                 submit->in_rb = true;
 789
 790         if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
 791                 struct dma_fence *in_fence;
 792
 793                 in_fence = sync_file_get_fence(args->fence_fd);
 794
 795                 if (!in_fence) {
 796                         ret = -EINVAL;
 797                         goto out_unlock;
 798                 }
 799
 800                 ret = drm_sched_job_add_dependency(&submit->base, in_fence);
 801                 if (ret)
 802                         goto out_unlock;
 803         }
 804
 805         if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
 806                 syncobjs_to_reset = msm_parse_deps(submit, file,
 807                                                    args->in_syncobjs,
 808                                                    args->nr_in_syncobjs,
 809                                                    args->syncobj_stride, ring);
 810                 if (IS_ERR(syncobjs_to_reset)) {
 811                         ret = PTR_ERR(syncobjs_to_reset);
 812                         goto out_unlock;
 813                 }
 814         }
 815
 816         if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
 817                 post_deps = msm_parse_post_deps(dev, file,
 818                                                 args->out_syncobjs,
 819                                                 args->nr_out_syncobjs,
 820                                                 args->syncobj_stride);
 821                 if (IS_ERR(post_deps)) {
 822                         ret = PTR_ERR(post_deps);
 823                         goto out_unlock;
 824                 }
 825         }
 826
 827         ret = submit_lookup_objects(submit, args, file);
 828         if (ret)
 829                 goto out;
 830
 831         ret = submit_lookup_cmds(submit, args, file);
 832         if (ret)
 833                 goto out;
 834
 835         /* copy_*_user while holding a ww ticket upsets lockdep */
 836         ww_acquire_init(&submit->ticket, &reservation_ww_class);
 837         has_ww_ticket = true;
 838         ret = submit_lock_objects(submit);
 839         if (ret)
 840                 goto out;
 841
 842         ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
 843         if (ret)
 844                 goto out;
 845
 846         ret = submit_pin_objects(submit);
 847         if (ret)
 848                 goto out;
 849
 850         for (i = 0; i < args->nr_cmds; i++) {
 851                 struct msm_gem_object *msm_obj;
 852                 uint64_t iova;
 853
 854                 ret = submit_bo(submit, submit->cmd[i].idx,
 855                                 &msm_obj, &iova, NULL);
 856                 if (ret)
 857                         goto out;
 858
 859                 if (!submit->cmd[i].size ||
 860                         ((submit->cmd[i].size + submit->cmd[i].offset) >
 861                                 msm_obj->base.size / 4)) {
 862                         DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
 863                         ret = -EINVAL;
 864                         goto out;
 865                 }
 866
 867                 submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
 868
 869                 if (submit->valid)
 870                         continue;
 871
 872                 ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4,
 873                                 submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
 874                 if (ret)
 875                         goto out;
 876         }
 877
 878         submit->nr_cmds = i;
 879
 880         idr_preload(GFP_KERNEL);
 881
 882         spin_lock(&queue->idr_lock);
 883
 884         /*
 885          * If using userspace provided seqno fence, validate that the id
 886          * is available before arming sched job.  Since access to fence_idr
 887          * is serialized on the queue lock, the slot should be still avail
 888          * after the job is armed
 889          */
 890         if ((args->flags & MSM_SUBMIT_FENCE_SN_IN) &&
 891                         idr_find(&queue->fence_idr, args->fence)) {
 892                 spin_unlock(&queue->idr_lock);
 893                 idr_preload_end();
 894                 ret = -EINVAL;
 895                 goto out;
 896         }
 897
 898         drm_sched_job_arm(&submit->base);
 899
 900         submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);
 901
 902         if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
 903                 /*
 904                  * Userspace has assigned the seqno fence that it wants
 905                  * us to use.  It is an error to pick a fence sequence
 906                  * number that is not available.
 907                  */
 908                 submit->fence_id = args->fence;
 909                 ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
 910                                     &submit->fence_id, submit->fence_id,
 911                                     GFP_NOWAIT);
 912                 /*
 913                  * We've already validated that the fence_id slot is valid,
 914                  * so if idr_alloc_u32 failed, it is a kernel bug
 915                  */
 916                 WARN_ON(ret);
 917         } else {
 918                 /*
 919                  * Allocate an id which can be used by WAIT_FENCE ioctl to map
 920                  * back to the underlying fence.
 921                  */
 922                 submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
 923                                                     submit->user_fence, 1,
 924                                                     INT_MAX, GFP_NOWAIT);
 925         }
 926
 927         spin_unlock(&queue->idr_lock);
 928         idr_preload_end();
 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 out_post_unlock:
 969         msm_gem_submit_put(submit);
 970         if (!IS_ERR_OR_NULL(post_deps)) {
 971                 for (i = 0; i < args->nr_out_syncobjs; ++i) {
 972                         kfree(post_deps[i].chain);
 973                         drm_syncobj_put(post_deps[i].syncobj);
 974                 }
 975                 kfree(post_deps);
 976         }
 977
 978         if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
 979                 for (i = 0; i < args->nr_in_syncobjs; ++i) {
 980                         if (syncobjs_to_reset[i])
 981                                 drm_syncobj_put(syncobjs_to_reset[i]);
 982                 }
 983                 kfree(syncobjs_to_reset);
 984         }
 985
 986         return ret;
 987 }