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_PINNED)
 236                 msm_gem_unpin_vma_locked(obj, submit->bos[i].vma);
 237
 238         if (flags & BO_ACTIVE)
 239                 msm_gem_active_put(obj);
 240
 241         if (flags & BO_LOCKED)
 242                 dma_resv_unlock(obj->resv);
 243 }
 244
 245 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
 246 {
 247         submit_cleanup_bo(submit, i, BO_PINNED | BO_ACTIVE | BO_LOCKED);
 248
 249         if (!(submit->bos[i].flags & BO_VALID))
 250                 submit->bos[i].iova = 0;
 251 }
 252
 253 /* This is where we make sure all the bo's are reserved and pin'd: */
 254 static int submit_lock_objects(struct msm_gem_submit *submit)
 255 {
 256         int contended, slow_locked = -1, i, ret = 0;
 257
 258 retry:
 259         for (i = 0; i < submit->nr_bos; i++) {
 260                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 261
 262                 if (slow_locked == i)
 263                         slow_locked = -1;
 264
 265                 contended = i;
 266
 267                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 268                         ret = dma_resv_lock_interruptible(msm_obj->base.resv,
 269                                                           &submit->ticket);
 270                         if (ret)
 271                                 goto fail;
 272                         submit->bos[i].flags |= BO_LOCKED;
 273                 }
 274         }
 275
 276         ww_acquire_done(&submit->ticket);
 277
 278         return 0;
 279
 280 fail:
 281         if (ret == -EALREADY) {
 282                 DRM_ERROR("handle %u at index %u already on submit list\n",
 283                                 submit->bos[i].handle, i);
 284                 ret = -EINVAL;
 285         }
 286
 287         for (; i >= 0; i--)
 288                 submit_unlock_unpin_bo(submit, i);
 289
 290         if (slow_locked > 0)
 291                 submit_unlock_unpin_bo(submit, slow_locked);
 292
 293         if (ret == -EDEADLK) {
 294                 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
 295                 /* we lost out in a seqno race, lock and retry.. */
 296                 ret = dma_resv_lock_slow_interruptible(msm_obj->base.resv,
 297                                                        &submit->ticket);
 298                 if (!ret) {
 299                         submit->bos[contended].flags |= BO_LOCKED;
 300                         slow_locked = contended;
 301                         goto retry;
 302                 }
 303
 304                 /* Not expecting -EALREADY here, if the bo was already
 305                  * locked, we should have gotten -EALREADY already from
 306                  * the dma_resv_lock_interruptable() call.
 307                  */
 308                 WARN_ON_ONCE(ret == -EALREADY);
 309         }
 310
 311         return ret;
 312 }
 313
 314 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
 315 {
 316         int i, ret = 0;
 317
 318         for (i = 0; i < submit->nr_bos; i++) {
 319                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 320                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 321
 322                 /* NOTE: _reserve_shared() must happen before
 323                  * _add_shared_fence(), which makes this a slightly
 324                  * strange place to call it.  OTOH this is a
 325                  * convenient can-fail point to hook it in.
 326                  */
 327                 ret = dma_resv_reserve_fences(obj->resv, 1);
 328                 if (ret)
 329                         return ret;
 330
 331                 /* exclusive fences must be ordered */
 332                 if (no_implicit && !write)
 333                         continue;
 334
 335                 ret = drm_sched_job_add_implicit_dependencies(&submit->base,
 336                                                               obj,
 337                                                               write);
 338                 if (ret)
 339                         break;
 340         }
 341
 342         return ret;
 343 }
 344
 345 static int submit_pin_objects(struct msm_gem_submit *submit)
 346 {
 347         int i, ret = 0;
 348
 349         submit->valid = true;
 350
 351         /*
 352          * Increment active_count first, so if under memory pressure, we
 353          * don't inadvertently evict a bo needed by the submit in order
 354          * to pin an earlier bo in the same submit.
 355          */
 356         for (i = 0; i < submit->nr_bos; i++) {
 357                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 358
 359                 msm_gem_active_get(obj, submit->gpu);
 360                 submit->bos[i].flags |= BO_ACTIVE;
 361         }
 362
 363         for (i = 0; i < submit->nr_bos; i++) {
 364                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 365                 struct msm_gem_vma *vma;
 366
 367                 /* if locking succeeded, pin bo: */
 368                 vma = msm_gem_get_vma_locked(obj, submit->aspace);
 369                 if (IS_ERR(vma)) {
 370                         ret = PTR_ERR(vma);
 371                         break;
 372                 }
 373
 374                 ret = msm_gem_pin_vma_locked(obj, vma);
 375                 if (ret)
 376                         break;
 377
 378                 submit->bos[i].flags |= BO_PINNED;
 379                 submit->bos[i].vma = vma;
 380
 381                 if (vma->iova == submit->bos[i].iova) {
 382                         submit->bos[i].flags |= BO_VALID;
 383                 } else {
 384                         submit->bos[i].iova = vma->iova;
 385                         /* iova changed, so address in cmdstream is not valid: */
 386                         submit->bos[i].flags &= ~BO_VALID;
 387                         submit->valid = false;
 388                 }
 389         }
 390
 391         return ret;
 392 }
 393
 394 static void submit_attach_object_fences(struct msm_gem_submit *submit)
 395 {
 396         int i;
 397
 398         for (i = 0; i < submit->nr_bos; i++) {
 399                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 400
 401                 if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 402                         dma_resv_add_fence(obj->resv, submit->user_fence,
 403                                            DMA_RESV_USAGE_WRITE);
 404                 else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
 405                         dma_resv_add_fence(obj->resv, submit->user_fence,
 406                                            DMA_RESV_USAGE_READ);
 407         }
 408 }
 409
 410 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 411                 struct msm_gem_object **obj, uint64_t *iova, bool *valid)
 412 {
 413         if (idx >= submit->nr_bos) {
 414                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 415                                 idx, submit->nr_bos);
 416                 return -EINVAL;
 417         }
 418
 419         if (obj)
 420                 *obj = submit->bos[idx].obj;
 421         if (iova)
 422                 *iova = submit->bos[idx].iova;
 423         if (valid)
 424                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 425
 426         return 0;
 427 }
 428
 429 /* process the reloc's and patch up the cmdstream as needed: */
 430 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
 431                 uint32_t offset, uint32_t nr_relocs, struct drm_msm_gem_submit_reloc *relocs)
 432 {
 433         uint32_t i, last_offset = 0;
 434         uint32_t *ptr;
 435         int ret = 0;
 436
 437         if (!nr_relocs)
 438                 return 0;
 439
 440         if (offset % 4) {
 441                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 442                 return -EINVAL;
 443         }
 444
 445         /* For now, just map the entire thing.  Eventually we probably
 446          * to do it page-by-page, w/ kmap() if not vmap()d..
 447          */
 448         ptr = msm_gem_get_vaddr_locked(&obj->base);
 449
 450         if (IS_ERR(ptr)) {
 451                 ret = PTR_ERR(ptr);
 452                 DBG("failed to map: %d", ret);
 453                 return ret;
 454         }
 455
 456         for (i = 0; i < nr_relocs; i++) {
 457                 struct drm_msm_gem_submit_reloc submit_reloc = relocs[i];
 458                 uint32_t off;
 459                 uint64_t iova;
 460                 bool valid;
 461
 462                 if (submit_reloc.submit_offset % 4) {
 463                         DRM_ERROR("non-aligned reloc offset: %u\n",
 464                                         submit_reloc.submit_offset);
 465                         ret = -EINVAL;
 466                         goto out;
 467                 }
 468
 469                 /* offset in dwords: */
 470                 off = submit_reloc.submit_offset / 4;
 471
 472                 if ((off >= (obj->base.size / 4)) ||
 473                                 (off < last_offset)) {
 474                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 475                         ret = -EINVAL;
 476                         goto out;
 477                 }
 478
 479                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 480                 if (ret)
 481                         goto out;
 482
 483                 if (valid)
 484                         continue;
 485
 486                 iova += submit_reloc.reloc_offset;
 487
 488                 if (submit_reloc.shift < 0)
 489                         iova >>= -submit_reloc.shift;
 490                 else
 491                         iova <<= submit_reloc.shift;
 492
 493                 ptr[off] = iova | submit_reloc.or;
 494
 495                 last_offset = off;
 496         }
 497
 498 out:
 499         msm_gem_put_vaddr_locked(&obj->base);
 500
 501         return ret;
 502 }
 503
 504 /* Cleanup submit at end of ioctl.  In the error case, this also drops
 505  * references, unpins, and drops active refcnt.  In the non-error case,
 506  * this is done when the submit is retired.
 507  */
 508 static void submit_cleanup(struct msm_gem_submit *submit, bool error)
 509 {
 510         unsigned cleanup_flags = BO_LOCKED;
 511         unsigned i;
 512
 513         if (error)
 514                 cleanup_flags |= BO_PINNED | BO_ACTIVE;
 515
 516         for (i = 0; i < submit->nr_bos; i++) {
 517                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 518                 submit_cleanup_bo(submit, i, cleanup_flags);
 519                 if (error)
 520                         drm_gem_object_put(&msm_obj->base);
 521         }
 522 }
 523
 524 void msm_submit_retire(struct msm_gem_submit *submit)
 525 {
 526         int i;
 527
 528         for (i = 0; i < submit->nr_bos; i++) {
 529                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 530
 531                 msm_gem_lock(obj);
 532                 submit_cleanup_bo(submit, i, BO_PINNED | BO_ACTIVE);
 533                 msm_gem_unlock(obj);
 534                 drm_gem_object_put(obj);
 535         }
 536 }
 537
 538 struct msm_submit_post_dep {
 539         struct drm_syncobj *syncobj;
 540         uint64_t point;
 541         struct dma_fence_chain *chain;
 542 };
 543
 544 static struct drm_syncobj **msm_parse_deps(struct msm_gem_submit *submit,
 545                                            struct drm_file *file,
 546                                            uint64_t in_syncobjs_addr,
 547                                            uint32_t nr_in_syncobjs,
 548                                            size_t syncobj_stride,
 549                                            struct msm_ringbuffer *ring)
 550 {
 551         struct drm_syncobj **syncobjs = NULL;
 552         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 553         int ret = 0;
 554         uint32_t i, j;
 555
 556         syncobjs = kcalloc(nr_in_syncobjs, sizeof(*syncobjs),
 557                            GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 558         if (!syncobjs)
 559                 return ERR_PTR(-ENOMEM);
 560
 561         for (i = 0; i < nr_in_syncobjs; ++i) {
 562                 uint64_t address = in_syncobjs_addr + i * syncobj_stride;
 563                 struct dma_fence *fence;
 564
 565                 if (copy_from_user(&syncobj_desc,
 566                                    u64_to_user_ptr(address),
 567                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 568                         ret = -EFAULT;
 569                         break;
 570                 }
 571
 572                 if (syncobj_desc.point &&
 573                     !drm_core_check_feature(submit->dev, DRIVER_SYNCOBJ_TIMELINE)) {
 574                         ret = -EOPNOTSUPP;
 575                         break;
 576                 }
 577
 578                 if (syncobj_desc.flags & ~MSM_SUBMIT_SYNCOBJ_FLAGS) {
 579                         ret = -EINVAL;
 580                         break;
 581                 }
 582
 583                 ret = drm_syncobj_find_fence(file, syncobj_desc.handle,
 584                                              syncobj_desc.point, 0, &fence);
 585                 if (ret)
 586                         break;
 587
 588                 ret = drm_sched_job_add_dependency(&submit->base, fence);
 589                 if (ret)
 590                         break;
 591
 592                 if (syncobj_desc.flags & MSM_SUBMIT_SYNCOBJ_RESET) {
 593                         syncobjs[i] =
 594                                 drm_syncobj_find(file, syncobj_desc.handle);
 595                         if (!syncobjs[i]) {
 596                                 ret = -EINVAL;
 597                                 break;
 598                         }
 599                 }
 600         }
 601
 602         if (ret) {
 603                 for (j = 0; j <= i; ++j) {
 604                         if (syncobjs[j])
 605                                 drm_syncobj_put(syncobjs[j]);
 606                 }
 607                 kfree(syncobjs);
 608                 return ERR_PTR(ret);
 609         }
 610         return syncobjs;
 611 }
 612
 613 static void msm_reset_syncobjs(struct drm_syncobj **syncobjs,
 614                                uint32_t nr_syncobjs)
 615 {
 616         uint32_t i;
 617
 618         for (i = 0; syncobjs && i < nr_syncobjs; ++i) {
 619                 if (syncobjs[i])
 620                         drm_syncobj_replace_fence(syncobjs[i], NULL);
 621         }
 622 }
 623
 624 static struct msm_submit_post_dep *msm_parse_post_deps(struct drm_device *dev,
 625                                                        struct drm_file *file,
 626                                                        uint64_t syncobjs_addr,
 627                                                        uint32_t nr_syncobjs,
 628                                                        size_t syncobj_stride)
 629 {
 630         struct msm_submit_post_dep *post_deps;
 631         struct drm_msm_gem_submit_syncobj syncobj_desc = {0};
 632         int ret = 0;
 633         uint32_t i, j;
 634
 635         post_deps = kmalloc_array(nr_syncobjs, sizeof(*post_deps),
 636                                   GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 637         if (!post_deps)
 638                 return ERR_PTR(-ENOMEM);
 639
 640         for (i = 0; i < nr_syncobjs; ++i) {
 641                 uint64_t address = syncobjs_addr + i * syncobj_stride;
 642
 643                 if (copy_from_user(&syncobj_desc,
 644                                    u64_to_user_ptr(address),
 645                                    min(syncobj_stride, sizeof(syncobj_desc)))) {
 646                         ret = -EFAULT;
 647                         break;
 648                 }
 649
 650                 post_deps[i].point = syncobj_desc.point;
 651                 post_deps[i].chain = NULL;
 652
 653                 if (syncobj_desc.flags) {
 654                         ret = -EINVAL;
 655                         break;
 656                 }
 657
 658                 if (syncobj_desc.point) {
 659                         if (!drm_core_check_feature(dev,
 660                                                     DRIVER_SYNCOBJ_TIMELINE)) {
 661                                 ret = -EOPNOTSUPP;
 662                                 break;
 663                         }
 664
 665                         post_deps[i].chain = dma_fence_chain_alloc();
 666                         if (!post_deps[i].chain) {
 667                                 ret = -ENOMEM;
 668                                 break;
 669                         }
 670                 }
 671
 672                 post_deps[i].syncobj =
 673                         drm_syncobj_find(file, syncobj_desc.handle);
 674                 if (!post_deps[i].syncobj) {
 675                         ret = -EINVAL;
 676                         break;
 677                 }
 678         }
 679
 680         if (ret) {
 681                 for (j = 0; j <= i; ++j) {
 682                         dma_fence_chain_free(post_deps[j].chain);
 683                         if (post_deps[j].syncobj)
 684                                 drm_syncobj_put(post_deps[j].syncobj);
 685                 }
 686
 687                 kfree(post_deps);
 688                 return ERR_PTR(ret);
 689         }
 690
 691         return post_deps;
 692 }
 693
 694 static void msm_process_post_deps(struct msm_submit_post_dep *post_deps,
 695                                   uint32_t count, struct dma_fence *fence)
 696 {
 697         uint32_t i;
 698
 699         for (i = 0; post_deps && i < count; ++i) {
 700                 if (post_deps[i].chain) {
 701                         drm_syncobj_add_point(post_deps[i].syncobj,
 702                                               post_deps[i].chain,
 703                                               fence, post_deps[i].point);
 704                         post_deps[i].chain = NULL;
 705                 } else {
 706                         drm_syncobj_replace_fence(post_deps[i].syncobj,
 707                                                   fence);
 708                 }
 709         }
 710 }
 711
 712 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 713                 struct drm_file *file)
 714 {
 715         static atomic_t ident = ATOMIC_INIT(0);
 716         struct msm_drm_private *priv = dev->dev_private;
 717         struct drm_msm_gem_submit *args = data;
 718         struct msm_file_private *ctx = file->driver_priv;
 719         struct msm_gem_submit *submit = NULL;
 720         struct msm_gpu *gpu = priv->gpu;
 721         struct msm_gpu_submitqueue *queue;
 722         struct msm_ringbuffer *ring;
 723         struct msm_submit_post_dep *post_deps = NULL;
 724         struct drm_syncobj **syncobjs_to_reset = NULL;
 725         int out_fence_fd = -1;
 726         struct pid *pid = get_pid(task_pid(current));
 727         bool has_ww_ticket = false;
 728         unsigned i;
 729         int ret, submitid;
 730
 731         if (!gpu)
 732                 return -ENXIO;
 733
 734         if (args->pad)
 735                 return -EINVAL;
 736
 737         if (unlikely(!ctx->aspace) && !capable(CAP_SYS_RAWIO)) {
 738                 DRM_ERROR_RATELIMITED("IOMMU support or CAP_SYS_RAWIO required!\n");
 739                 return -EPERM;
 740         }
 741
 742         /* for now, we just have 3d pipe.. eventually this would need to
 743          * be more clever to dispatch to appropriate gpu module:
 744          */
 745         if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
 746                 return -EINVAL;
 747
 748         if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
 749                 return -EINVAL;
 750
 751         if (args->flags & MSM_SUBMIT_SUDO) {
 752                 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
 753                     !capable(CAP_SYS_RAWIO))
 754                         return -EINVAL;
 755         }
 756
 757         queue = msm_submitqueue_get(ctx, args->queueid);
 758         if (!queue)
 759                 return -ENOENT;
 760
 761         /* Get a unique identifier for the submission for logging purposes */
 762         submitid = atomic_inc_return(&ident) - 1;
 763
 764         ring = gpu->rb[queue->ring_nr];
 765         trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid,
 766                 args->nr_bos, args->nr_cmds);
 767
 768         ret = mutex_lock_interruptible(&queue->lock);
 769         if (ret)
 770                 goto out_post_unlock;
 771
 772         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 773                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 774                 if (out_fence_fd < 0) {
 775                         ret = out_fence_fd;
 776                         goto out_unlock;
 777                 }
 778         }
 779
 780         submit = submit_create(dev, gpu, queue, args->nr_bos,
 781                 args->nr_cmds);
 782         if (IS_ERR(submit)) {
 783                 ret = PTR_ERR(submit);
 784                 submit = NULL;
 785                 goto out_unlock;
 786         }
 787
 788         submit->pid = pid;
 789         submit->ident = submitid;
 790
 791         if (args->flags & MSM_SUBMIT_SUDO)
 792                 submit->in_rb = true;
 793
 794         if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
 795                 struct dma_fence *in_fence;
 796
 797                 in_fence = sync_file_get_fence(args->fence_fd);
 798
 799                 if (!in_fence) {
 800                         ret = -EINVAL;
 801                         goto out_unlock;
 802                 }
 803
 804                 ret = drm_sched_job_add_dependency(&submit->base, in_fence);
 805                 if (ret)
 806                         goto out_unlock;
 807         }
 808
 809         if (args->flags & MSM_SUBMIT_SYNCOBJ_IN) {
 810                 syncobjs_to_reset = msm_parse_deps(submit, file,
 811                                                    args->in_syncobjs,
 812                                                    args->nr_in_syncobjs,
 813                                                    args->syncobj_stride, ring);
 814                 if (IS_ERR(syncobjs_to_reset)) {
 815                         ret = PTR_ERR(syncobjs_to_reset);
 816                         goto out_unlock;
 817                 }
 818         }
 819
 820         if (args->flags & MSM_SUBMIT_SYNCOBJ_OUT) {
 821                 post_deps = msm_parse_post_deps(dev, file,
 822                                                 args->out_syncobjs,
 823                                                 args->nr_out_syncobjs,
 824                                                 args->syncobj_stride);
 825                 if (IS_ERR(post_deps)) {
 826                         ret = PTR_ERR(post_deps);
 827                         goto out_unlock;
 828                 }
 829         }
 830
 831         ret = submit_lookup_objects(submit, args, file);
 832         if (ret)
 833                 goto out;
 834
 835         ret = submit_lookup_cmds(submit, args, file);
 836         if (ret)
 837                 goto out;
 838
 839         /* copy_*_user while holding a ww ticket upsets lockdep */
 840         ww_acquire_init(&submit->ticket, &reservation_ww_class);
 841         has_ww_ticket = true;
 842         ret = submit_lock_objects(submit);
 843         if (ret)
 844                 goto out;
 845
 846         ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
 847         if (ret)
 848                 goto out;
 849
 850         ret = submit_pin_objects(submit);
 851         if (ret)
 852                 goto out;
 853
 854         for (i = 0; i < args->nr_cmds; i++) {
 855                 struct msm_gem_object *msm_obj;
 856                 uint64_t iova;
 857
 858                 ret = submit_bo(submit, submit->cmd[i].idx,
 859                                 &msm_obj, &iova, NULL);
 860                 if (ret)
 861                         goto out;
 862
 863                 if (!submit->cmd[i].size ||
 864                         ((submit->cmd[i].size + submit->cmd[i].offset) >
 865                                 msm_obj->base.size / 4)) {
 866                         DRM_ERROR("invalid cmdstream size: %u\n", submit->cmd[i].size * 4);
 867                         ret = -EINVAL;
 868                         goto out;
 869                 }
 870
 871                 submit->cmd[i].iova = iova + (submit->cmd[i].offset * 4);
 872
 873                 if (submit->valid)
 874                         continue;
 875
 876                 ret = submit_reloc(submit, msm_obj, submit->cmd[i].offset * 4,
 877                                 submit->cmd[i].nr_relocs, submit->cmd[i].relocs);
 878                 if (ret)
 879                         goto out;
 880         }
 881
 882         submit->nr_cmds = i;
 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                 ret = -EINVAL;
 893                 goto out;
 894         }
 895
 896         drm_sched_job_arm(&submit->base);
 897
 898         submit->user_fence = dma_fence_get(&submit->base.s_fence->finished);
 899
 900         if (args->flags & MSM_SUBMIT_FENCE_SN_IN) {
 901                 /*
 902                  * Userspace has assigned the seqno fence that it wants
 903                  * us to use.  It is an error to pick a fence sequence
 904                  * number that is not available.
 905                  */
 906                 submit->fence_id = args->fence;
 907                 ret = idr_alloc_u32(&queue->fence_idr, submit->user_fence,
 908                                     &submit->fence_id, submit->fence_id,
 909                                     GFP_KERNEL);
 910                 /*
 911                  * We've already validated that the fence_id slot is valid,
 912                  * so if idr_alloc_u32 failed, it is a kernel bug
 913                  */
 914                 WARN_ON(ret);
 915         } else {
 916                 /*
 917                  * Allocate an id which can be used by WAIT_FENCE ioctl to map
 918                  * back to the underlying fence.
 919                  */
 920                 submit->fence_id = idr_alloc_cyclic(&queue->fence_idr,
 921                                                     submit->user_fence, 1,
 922                                                     INT_MAX, GFP_KERNEL);
 923         }
 924         if (submit->fence_id < 0) {
 925                 ret = submit->fence_id = 0;
 926                 submit->fence_id = 0;
 927         }
 928
 929         if (ret == 0 && args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 930                 struct sync_file *sync_file = sync_file_create(submit->user_fence);
 931                 if (!sync_file) {
 932                         ret = -ENOMEM;
 933                 } else {
 934                         fd_install(out_fence_fd, sync_file->file);
 935                         args->fence_fd = out_fence_fd;
 936                 }
 937         }
 938
 939         submit_attach_object_fences(submit);
 940
 941         /* The scheduler owns a ref now: */
 942         msm_gem_submit_get(submit);
 943
 944         drm_sched_entity_push_job(&submit->base);
 945
 946         args->fence = submit->fence_id;
 947         queue->last_fence = submit->fence_id;
 948
 949         msm_reset_syncobjs(syncobjs_to_reset, args->nr_in_syncobjs);
 950         msm_process_post_deps(post_deps, args->nr_out_syncobjs,
 951                               submit->user_fence);
 952
 953
 954 out:
 955         submit_cleanup(submit, !!ret);
 956         if (has_ww_ticket)
 957                 ww_acquire_fini(&submit->ticket);
 958 out_unlock:
 959         if (ret && (out_fence_fd >= 0))
 960                 put_unused_fd(out_fence_fd);
 961         mutex_unlock(&queue->lock);
 962         if (submit)
 963                 msm_gem_submit_put(submit);
 964 out_post_unlock:
 965         if (!IS_ERR_OR_NULL(post_deps)) {
 966                 for (i = 0; i < args->nr_out_syncobjs; ++i) {
 967                         kfree(post_deps[i].chain);
 968                         drm_syncobj_put(post_deps[i].syncobj);
 969                 }
 970                 kfree(post_deps);
 971         }
 972
 973         if (!IS_ERR_OR_NULL(syncobjs_to_reset)) {
 974                 for (i = 0; i < args->nr_in_syncobjs; ++i) {
 975                         if (syncobjs_to_reset[i])
 976                                 drm_syncobj_put(syncobjs_to_reset[i]);
 977                 }
 978                 kfree(syncobjs_to_reset);
 979         }
 980
 981         return ret;
 982 }