drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Etnaviv Project
   4  */
   5
   6 #include <drm/drm_file.h>
   7 #include <linux/dma-fence-array.h>
   8 #include <linux/file.h>
   9 #include <linux/pm_runtime.h>
  10 #include <linux/dma-resv.h>
  11 #include <linux/sync_file.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/vmalloc.h>
  14
  15 #include "etnaviv_cmdbuf.h"
  16 #include "etnaviv_drv.h"
  17 #include "etnaviv_gpu.h"
  18 #include "etnaviv_gem.h"
  19 #include "etnaviv_perfmon.h"
  20 #include "etnaviv_sched.h"
  21
  22 /*
  23  * Cmdstream submission:
  24  */
  25
  26 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
  27 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
  28 #define BO_LOCKED   0x4000
  29 #define BO_PINNED   0x2000
  30
  31 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  32                 struct etnaviv_gpu *gpu, size_t nr_bos, size_t nr_pmrs)
  33 {
  34         struct etnaviv_gem_submit *submit;
  35         size_t sz = size_vstruct(nr_bos, sizeof(submit->bos[0]), sizeof(*submit));
  36
  37         submit = kzalloc(sz, GFP_KERNEL);
  38         if (!submit)
  39                 return NULL;
  40
  41         submit->pmrs = kcalloc(nr_pmrs, sizeof(struct etnaviv_perfmon_request),
  42                                GFP_KERNEL);
  43         if (!submit->pmrs) {
  44                 kfree(submit);
  45                 return NULL;
  46         }
  47         submit->nr_pmrs = nr_pmrs;
  48
  49         submit->gpu = gpu;
  50         kref_init(&submit->refcount);
  51
  52         return submit;
  53 }
  54
  55 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  56         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  57         unsigned nr_bos)
  58 {
  59         struct drm_etnaviv_gem_submit_bo *bo;
  60         unsigned i;
  61         int ret = 0;
  62
  63         spin_lock(&file->table_lock);
  64
  65         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  66                 struct drm_gem_object *obj;
  67
  68                 if (bo->flags & BO_INVALID_FLAGS) {
  69                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  70                         ret = -EINVAL;
  71                         goto out_unlock;
  72                 }
  73
  74                 submit->bos[i].flags = bo->flags;
  75                 if (submit->flags & ETNA_SUBMIT_SOFTPIN) {
  76                         if (bo->presumed < ETNAVIV_SOFTPIN_START_ADDRESS) {
  77                                 DRM_ERROR("invalid softpin address\n");
  78                                 ret = -EINVAL;
  79                                 goto out_unlock;
  80                         }
  81                         submit->bos[i].va = bo->presumed;
  82                 }
  83
  84                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  85                  * all under single table_lock just hit object_idr directly:
  86                  */
  87                 obj = idr_find(&file->object_idr, bo->handle);
  88                 if (!obj) {
  89                         DRM_ERROR("invalid handle %u at index %u\n",
  90                                   bo->handle, i);
  91                         ret = -EINVAL;
  92                         goto out_unlock;
  93                 }
  94
  95                 /*
  96                  * Take a refcount on the object. The file table lock
  97                  * prevents the object_idr's refcount on this being dropped.
  98                  */
  99                 drm_gem_object_get(obj);
 100
 101                 submit->bos[i].obj = to_etnaviv_bo(obj);
 102         }
 103
 104 out_unlock:
 105         submit->nr_bos = i;
 106         spin_unlock(&file->table_lock);
 107
 108         return ret;
 109 }
 110
 111 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 112 {
 113         if (submit->bos[i].flags & BO_LOCKED) {
 114                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 115
 116                 dma_resv_unlock(obj->resv);
 117                 submit->bos[i].flags &= ~BO_LOCKED;
 118         }
 119 }
 120
 121 static int submit_lock_objects(struct etnaviv_gem_submit *submit,
 122                 struct ww_acquire_ctx *ticket)
 123 {
 124         int contended, slow_locked = -1, i, ret = 0;
 125
 126 retry:
 127         for (i = 0; i < submit->nr_bos; i++) {
 128                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 129
 130                 if (slow_locked == i)
 131                         slow_locked = -1;
 132
 133                 contended = i;
 134
 135                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 136                         ret = dma_resv_lock_interruptible(obj->resv, ticket);
 137                         if (ret == -EALREADY)
 138                                 DRM_ERROR("BO at index %u already on submit list\n",
 139                                           i);
 140                         if (ret)
 141                                 goto fail;
 142                         submit->bos[i].flags |= BO_LOCKED;
 143                 }
 144         }
 145
 146         ww_acquire_done(ticket);
 147
 148         return 0;
 149
 150 fail:
 151         for (; i >= 0; i--)
 152                 submit_unlock_object(submit, i);
 153
 154         if (slow_locked > 0)
 155                 submit_unlock_object(submit, slow_locked);
 156
 157         if (ret == -EDEADLK) {
 158                 struct drm_gem_object *obj;
 159
 160                 obj = &submit->bos[contended].obj->base;
 161
 162                 /* we lost out in a seqno race, lock and retry.. */
 163                 ret = dma_resv_lock_slow_interruptible(obj->resv, ticket);
 164                 if (!ret) {
 165                         submit->bos[contended].flags |= BO_LOCKED;
 166                         slow_locked = contended;
 167                         goto retry;
 168                 }
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int submit_fence_sync(struct etnaviv_gem_submit *submit)
 175 {
 176         int i, ret = 0;
 177
 178         for (i = 0; i < submit->nr_bos; i++) {
 179                 struct etnaviv_gem_submit_bo *bo = &submit->bos[i];
 180                 struct dma_resv *robj = bo->obj->base.resv;
 181
 182                 if (!(bo->flags & ETNA_SUBMIT_BO_WRITE)) {
 183                         ret = dma_resv_reserve_shared(robj, 1);
 184                         if (ret)
 185                                 return ret;
 186                 }
 187
 188                 if (submit->flags & ETNA_SUBMIT_NO_IMPLICIT)
 189                         continue;
 190
 191                 if (bo->flags & ETNA_SUBMIT_BO_WRITE) {
 192                         ret = dma_resv_get_fences(robj, &bo->excl,
 193                                                   &bo->nr_shared,
 194                                                   &bo->shared);
 195                         if (ret)
 196                                 return ret;
 197                 } else {
 198                         bo->excl = dma_resv_get_excl_unlocked(robj);
 199                 }
 200
 201         }
 202
 203         return ret;
 204 }
 205
 206 static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)
 207 {
 208         int i;
 209
 210         for (i = 0; i < submit->nr_bos; i++) {
 211                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 212
 213                 if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
 214                         dma_resv_add_excl_fence(obj->resv,
 215                                                           submit->out_fence);
 216                 else
 217                         dma_resv_add_shared_fence(obj->resv,
 218                                                             submit->out_fence);
 219
 220                 submit_unlock_object(submit, i);
 221         }
 222 }
 223
 224 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 225 {
 226         int i, ret = 0;
 227
 228         for (i = 0; i < submit->nr_bos; i++) {
 229                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 230                 struct etnaviv_vram_mapping *mapping;
 231
 232                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 233                                                   submit->mmu_context,
 234                                                   submit->bos[i].va);
 235                 if (IS_ERR(mapping)) {
 236                         ret = PTR_ERR(mapping);
 237                         break;
 238                 }
 239
 240                 if ((submit->flags & ETNA_SUBMIT_SOFTPIN) &&
 241                      submit->bos[i].va != mapping->iova) {
 242                         etnaviv_gem_mapping_unreference(mapping);
 243                         return -EINVAL;
 244                 }
 245
 246                 atomic_inc(&etnaviv_obj->gpu_active);
 247
 248                 submit->bos[i].flags |= BO_PINNED;
 249                 submit->bos[i].mapping = mapping;
 250         }
 251
 252         return ret;
 253 }
 254
 255 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 256         struct etnaviv_gem_submit_bo **bo)
 257 {
 258         if (idx >= submit->nr_bos) {
 259                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 260                                 idx, submit->nr_bos);
 261                 return -EINVAL;
 262         }
 263
 264         *bo = &submit->bos[idx];
 265
 266         return 0;
 267 }
 268
 269 /* process the reloc's and patch up the cmdstream as needed: */
 270 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 271                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 272                 u32 nr_relocs)
 273 {
 274         u32 i, last_offset = 0;
 275         u32 *ptr = stream;
 276         int ret;
 277
 278         /* Submits using softpin don't blend with relocs */
 279         if ((submit->flags & ETNA_SUBMIT_SOFTPIN) && nr_relocs != 0)
 280                 return -EINVAL;
 281
 282         for (i = 0; i < nr_relocs; i++) {
 283                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 284                 struct etnaviv_gem_submit_bo *bo;
 285                 u32 off;
 286
 287                 if (unlikely(r->flags)) {
 288                         DRM_ERROR("invalid reloc flags\n");
 289                         return -EINVAL;
 290                 }
 291
 292                 if (r->submit_offset % 4) {
 293                         DRM_ERROR("non-aligned reloc offset: %u\n",
 294                                   r->submit_offset);
 295                         return -EINVAL;
 296                 }
 297
 298                 /* offset in dwords: */
 299                 off = r->submit_offset / 4;
 300
 301                 if ((off >= size ) ||
 302                                 (off < last_offset)) {
 303                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 304                         return -EINVAL;
 305                 }
 306
 307                 ret = submit_bo(submit, r->reloc_idx, &bo);
 308                 if (ret)
 309                         return ret;
 310
 311                 if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
 312                         DRM_ERROR("relocation %u outside object\n", i);
 313                         return -EINVAL;
 314                 }
 315
 316                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 317
 318                 last_offset = off;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
 325                 u32 exec_state, const struct drm_etnaviv_gem_submit_pmr *pmrs)
 326 {
 327         u32 i;
 328
 329         for (i = 0; i < submit->nr_pmrs; i++) {
 330                 const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
 331                 struct etnaviv_gem_submit_bo *bo;
 332                 int ret;
 333
 334                 ret = submit_bo(submit, r->read_idx, &bo);
 335                 if (ret)
 336                         return ret;
 337
 338                 /* at offset 0 a sequence number gets stored used for userspace sync */
 339                 if (r->read_offset == 0) {
 340                         DRM_ERROR("perfmon request: offset is 0");
 341                         return -EINVAL;
 342                 }
 343
 344                 if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
 345                         DRM_ERROR("perfmon request: offset %u outside object", i);
 346                         return -EINVAL;
 347                 }
 348
 349                 if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
 350                         DRM_ERROR("perfmon request: flags are not valid");
 351                         return -EINVAL;
 352                 }
 353
 354                 if (etnaviv_pm_req_validate(r, exec_state)) {
 355                         DRM_ERROR("perfmon request: domain or signal not valid");
 356                         return -EINVAL;
 357                 }
 358
 359                 submit->pmrs[i].flags = r->flags;
 360                 submit->pmrs[i].domain = r->domain;
 361                 submit->pmrs[i].signal = r->signal;
 362                 submit->pmrs[i].sequence = r->sequence;
 363                 submit->pmrs[i].offset = r->read_offset;
 364                 submit->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
 365         }
 366
 367         return 0;
 368 }
 369
 370 static void submit_cleanup(struct kref *kref)
 371 {
 372         struct etnaviv_gem_submit *submit =
 373                         container_of(kref, struct etnaviv_gem_submit, refcount);
 374         unsigned i;
 375
 376         if (submit->runtime_resumed)
 377                 pm_runtime_put_autosuspend(submit->gpu->dev);
 378
 379         if (submit->cmdbuf.suballoc)
 380                 etnaviv_cmdbuf_free(&submit->cmdbuf);
 381
 382         if (submit->mmu_context)
 383                 etnaviv_iommu_context_put(submit->mmu_context);
 384
 385         if (submit->prev_mmu_context)
 386                 etnaviv_iommu_context_put(submit->prev_mmu_context);
 387
 388         for (i = 0; i < submit->nr_bos; i++) {
 389                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 390
 391                 /* unpin all objects */
 392                 if (submit->bos[i].flags & BO_PINNED) {
 393                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 394                         atomic_dec(&etnaviv_obj->gpu_active);
 395                         submit->bos[i].mapping = NULL;
 396                         submit->bos[i].flags &= ~BO_PINNED;
 397                 }
 398
 399                 /* if the GPU submit failed, objects might still be locked */
 400                 submit_unlock_object(submit, i);
 401                 drm_gem_object_put(&etnaviv_obj->base);
 402         }
 403
 404         wake_up_all(&submit->gpu->fence_event);
 405
 406         if (submit->in_fence)
 407                 dma_fence_put(submit->in_fence);
 408         if (submit->out_fence) {
 409                 /* first remove from IDR, so fence can not be found anymore */
 410                 mutex_lock(&submit->gpu->fence_lock);
 411                 idr_remove(&submit->gpu->fence_idr, submit->out_fence_id);
 412                 mutex_unlock(&submit->gpu->fence_lock);
 413                 dma_fence_put(submit->out_fence);
 414         }
 415         kfree(submit->pmrs);
 416         kfree(submit);
 417 }
 418
 419 void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
 420 {
 421         kref_put(&submit->refcount, submit_cleanup);
 422 }
 423
 424 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 425                 struct drm_file *file)
 426 {
 427         struct etnaviv_file_private *ctx = file->driver_priv;
 428         struct etnaviv_drm_private *priv = dev->dev_private;
 429         struct drm_etnaviv_gem_submit *args = data;
 430         struct drm_etnaviv_gem_submit_reloc *relocs;
 431         struct drm_etnaviv_gem_submit_pmr *pmrs;
 432         struct drm_etnaviv_gem_submit_bo *bos;
 433         struct etnaviv_gem_submit *submit;
 434         struct etnaviv_gpu *gpu;
 435         struct sync_file *sync_file = NULL;
 436         struct ww_acquire_ctx ticket;
 437         int out_fence_fd = -1;
 438         void *stream;
 439         int ret;
 440
 441         if (args->pipe >= ETNA_MAX_PIPES)
 442                 return -EINVAL;
 443
 444         gpu = priv->gpu[args->pipe];
 445         if (!gpu)
 446                 return -ENXIO;
 447
 448         if (args->stream_size % 4) {
 449                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 450                           args->stream_size);
 451                 return -EINVAL;
 452         }
 453
 454         if (args->exec_state != ETNA_PIPE_3D &&
 455             args->exec_state != ETNA_PIPE_2D &&
 456             args->exec_state != ETNA_PIPE_VG) {
 457                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 458                 return -EINVAL;
 459         }
 460
 461         if (args->flags & ~ETNA_SUBMIT_FLAGS) {
 462                 DRM_ERROR("invalid flags: 0x%x\n", args->flags);
 463                 return -EINVAL;
 464         }
 465
 466         if ((args->flags & ETNA_SUBMIT_SOFTPIN) &&
 467             priv->mmu_global->version != ETNAVIV_IOMMU_V2) {
 468                 DRM_ERROR("softpin requested on incompatible MMU\n");
 469                 return -EINVAL;
 470         }
 471
 472         /*
 473          * Copy the command submission and bo array to kernel space in
 474          * one go, and do this outside of any locks.
 475          */
 476         bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
 477         relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
 478         pmrs = kvmalloc_array(args->nr_pmrs, sizeof(*pmrs), GFP_KERNEL);
 479         stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
 480         if (!bos || !relocs || !pmrs || !stream) {
 481                 ret = -ENOMEM;
 482                 goto err_submit_cmds;
 483         }
 484
 485         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 486                              args->nr_bos * sizeof(*bos));
 487         if (ret) {
 488                 ret = -EFAULT;
 489                 goto err_submit_cmds;
 490         }
 491
 492         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 493                              args->nr_relocs * sizeof(*relocs));
 494         if (ret) {
 495                 ret = -EFAULT;
 496                 goto err_submit_cmds;
 497         }
 498
 499         ret = copy_from_user(pmrs, u64_to_user_ptr(args->pmrs),
 500                              args->nr_pmrs * sizeof(*pmrs));
 501         if (ret) {
 502                 ret = -EFAULT;
 503                 goto err_submit_cmds;
 504         }
 505
 506         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 507                              args->stream_size);
 508         if (ret) {
 509                 ret = -EFAULT;
 510                 goto err_submit_cmds;
 511         }
 512
 513         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 514                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 515                 if (out_fence_fd < 0) {
 516                         ret = out_fence_fd;
 517                         goto err_submit_cmds;
 518                 }
 519         }
 520
 521         ww_acquire_init(&ticket, &reservation_ww_class);
 522
 523         submit = submit_create(dev, gpu, args->nr_bos, args->nr_pmrs);
 524         if (!submit) {
 525                 ret = -ENOMEM;
 526                 goto err_submit_ww_acquire;
 527         }
 528
 529         ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &submit->cmdbuf,
 530                                   ALIGN(args->stream_size, 8) + 8);
 531         if (ret)
 532                 goto err_submit_objects;
 533
 534         submit->ctx = file->driver_priv;
 535         etnaviv_iommu_context_get(submit->ctx->mmu);
 536         submit->mmu_context = submit->ctx->mmu;
 537         submit->exec_state = args->exec_state;
 538         submit->flags = args->flags;
 539
 540         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 541         if (ret)
 542                 goto err_submit_objects;
 543
 544         if ((priv->mmu_global->version != ETNAVIV_IOMMU_V2) &&
 545             !etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 546                                       relocs, args->nr_relocs)) {
 547                 ret = -EINVAL;
 548                 goto err_submit_objects;
 549         }
 550
 551         if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 552                 submit->in_fence = sync_file_get_fence(args->fence_fd);
 553                 if (!submit->in_fence) {
 554                         ret = -EINVAL;
 555                         goto err_submit_objects;
 556                 }
 557         }
 558
 559         ret = submit_pin_objects(submit);
 560         if (ret)
 561                 goto err_submit_objects;
 562
 563         ret = submit_reloc(submit, stream, args->stream_size / 4,
 564                            relocs, args->nr_relocs);
 565         if (ret)
 566                 goto err_submit_objects;
 567
 568         ret = submit_perfmon_validate(submit, args->exec_state, pmrs);
 569         if (ret)
 570                 goto err_submit_objects;
 571
 572         memcpy(submit->cmdbuf.vaddr, stream, args->stream_size);
 573
 574         ret = submit_lock_objects(submit, &ticket);
 575         if (ret)
 576                 goto err_submit_objects;
 577
 578         ret = submit_fence_sync(submit);
 579         if (ret)
 580                 goto err_submit_objects;
 581
 582         ret = etnaviv_sched_push_job(&ctx->sched_entity[args->pipe], submit);
 583         if (ret)
 584                 goto err_submit_objects;
 585
 586         submit_attach_object_fences(submit);
 587
 588         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 589                 /*
 590                  * This can be improved: ideally we want to allocate the sync
 591                  * file before kicking off the GPU job and just attach the
 592                  * fence to the sync file here, eliminating the ENOMEM
 593                  * possibility at this stage.
 594                  */
 595                 sync_file = sync_file_create(submit->out_fence);
 596                 if (!sync_file) {
 597                         ret = -ENOMEM;
 598                         goto err_submit_objects;
 599                 }
 600                 fd_install(out_fence_fd, sync_file->file);
 601         }
 602
 603         args->fence_fd = out_fence_fd;
 604         args->fence = submit->out_fence_id;
 605
 606 err_submit_objects:
 607         etnaviv_submit_put(submit);
 608
 609 err_submit_ww_acquire:
 610         ww_acquire_fini(&ticket);
 611
 612 err_submit_cmds:
 613         if (ret && (out_fence_fd >= 0))
 614                 put_unused_fd(out_fence_fd);
 615         kvfree(stream);
 616         kvfree(bos);
 617         kvfree(relocs);
 618         kvfree(pmrs);
 619
 620         return ret;
 621 }