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_rcu(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_rcu(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                         return -EINVAL;
 243
 244                 atomic_inc(&etnaviv_obj->gpu_active);
 245
 246                 submit->bos[i].flags |= BO_PINNED;
 247                 submit->bos[i].mapping = mapping;
 248         }
 249
 250         return ret;
 251 }
 252
 253 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 254         struct etnaviv_gem_submit_bo **bo)
 255 {
 256         if (idx >= submit->nr_bos) {
 257                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 258                                 idx, submit->nr_bos);
 259                 return -EINVAL;
 260         }
 261
 262         *bo = &submit->bos[idx];
 263
 264         return 0;
 265 }
 266
 267 /* process the reloc's and patch up the cmdstream as needed: */
 268 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 269                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 270                 u32 nr_relocs)
 271 {
 272         u32 i, last_offset = 0;
 273         u32 *ptr = stream;
 274         int ret;
 275
 276         /* Submits using softpin don't blend with relocs */
 277         if ((submit->flags & ETNA_SUBMIT_SOFTPIN) && nr_relocs != 0)
 278                 return -EINVAL;
 279
 280         for (i = 0; i < nr_relocs; i++) {
 281                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 282                 struct etnaviv_gem_submit_bo *bo;
 283                 u32 off;
 284
 285                 if (unlikely(r->flags)) {
 286                         DRM_ERROR("invalid reloc flags\n");
 287                         return -EINVAL;
 288                 }
 289
 290                 if (r->submit_offset % 4) {
 291                         DRM_ERROR("non-aligned reloc offset: %u\n",
 292                                   r->submit_offset);
 293                         return -EINVAL;
 294                 }
 295
 296                 /* offset in dwords: */
 297                 off = r->submit_offset / 4;
 298
 299                 if ((off >= size ) ||
 300                                 (off < last_offset)) {
 301                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 302                         return -EINVAL;
 303                 }
 304
 305                 ret = submit_bo(submit, r->reloc_idx, &bo);
 306                 if (ret)
 307                         return ret;
 308
 309                 if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
 310                         DRM_ERROR("relocation %u outside object\n", i);
 311                         return -EINVAL;
 312                 }
 313
 314                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 315
 316                 last_offset = off;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
 323                 u32 exec_state, const struct drm_etnaviv_gem_submit_pmr *pmrs)
 324 {
 325         u32 i;
 326
 327         for (i = 0; i < submit->nr_pmrs; i++) {
 328                 const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
 329                 struct etnaviv_gem_submit_bo *bo;
 330                 int ret;
 331
 332                 ret = submit_bo(submit, r->read_idx, &bo);
 333                 if (ret)
 334                         return ret;
 335
 336                 /* at offset 0 a sequence number gets stored used for userspace sync */
 337                 if (r->read_offset == 0) {
 338                         DRM_ERROR("perfmon request: offset is 0");
 339                         return -EINVAL;
 340                 }
 341
 342                 if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
 343                         DRM_ERROR("perfmon request: offset %u outside object", i);
 344                         return -EINVAL;
 345                 }
 346
 347                 if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
 348                         DRM_ERROR("perfmon request: flags are not valid");
 349                         return -EINVAL;
 350                 }
 351
 352                 if (etnaviv_pm_req_validate(r, exec_state)) {
 353                         DRM_ERROR("perfmon request: domain or signal not valid");
 354                         return -EINVAL;
 355                 }
 356
 357                 submit->pmrs[i].flags = r->flags;
 358                 submit->pmrs[i].domain = r->domain;
 359                 submit->pmrs[i].signal = r->signal;
 360                 submit->pmrs[i].sequence = r->sequence;
 361                 submit->pmrs[i].offset = r->read_offset;
 362                 submit->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static void submit_cleanup(struct kref *kref)
 369 {
 370         struct etnaviv_gem_submit *submit =
 371                         container_of(kref, struct etnaviv_gem_submit, refcount);
 372         unsigned i;
 373
 374         if (submit->runtime_resumed)
 375                 pm_runtime_put_autosuspend(submit->gpu->dev);
 376
 377         if (submit->cmdbuf.suballoc)
 378                 etnaviv_cmdbuf_free(&submit->cmdbuf);
 379
 380         if (submit->mmu_context)
 381                 etnaviv_iommu_context_put(submit->mmu_context);
 382
 383         if (submit->prev_mmu_context)
 384                 etnaviv_iommu_context_put(submit->prev_mmu_context);
 385
 386         for (i = 0; i < submit->nr_bos; i++) {
 387                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 388
 389                 /* unpin all objects */
 390                 if (submit->bos[i].flags & BO_PINNED) {
 391                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 392                         atomic_dec(&etnaviv_obj->gpu_active);
 393                         submit->bos[i].mapping = NULL;
 394                         submit->bos[i].flags &= ~BO_PINNED;
 395                 }
 396
 397                 /* if the GPU submit failed, objects might still be locked */
 398                 submit_unlock_object(submit, i);
 399                 drm_gem_object_put_unlocked(&etnaviv_obj->base);
 400         }
 401
 402         wake_up_all(&submit->gpu->fence_event);
 403
 404         if (submit->in_fence)
 405                 dma_fence_put(submit->in_fence);
 406         if (submit->out_fence) {
 407                 /* first remove from IDR, so fence can not be found anymore */
 408                 mutex_lock(&submit->gpu->fence_lock);
 409                 idr_remove(&submit->gpu->fence_idr, submit->out_fence_id);
 410                 mutex_unlock(&submit->gpu->fence_lock);
 411                 dma_fence_put(submit->out_fence);
 412         }
 413         kfree(submit->pmrs);
 414         kfree(submit);
 415 }
 416
 417 void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
 418 {
 419         kref_put(&submit->refcount, submit_cleanup);
 420 }
 421
 422 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 423                 struct drm_file *file)
 424 {
 425         struct etnaviv_file_private *ctx = file->driver_priv;
 426         struct etnaviv_drm_private *priv = dev->dev_private;
 427         struct drm_etnaviv_gem_submit *args = data;
 428         struct drm_etnaviv_gem_submit_reloc *relocs;
 429         struct drm_etnaviv_gem_submit_pmr *pmrs;
 430         struct drm_etnaviv_gem_submit_bo *bos;
 431         struct etnaviv_gem_submit *submit;
 432         struct etnaviv_gpu *gpu;
 433         struct sync_file *sync_file = NULL;
 434         struct ww_acquire_ctx ticket;
 435         int out_fence_fd = -1;
 436         void *stream;
 437         int ret;
 438
 439         if (args->pipe >= ETNA_MAX_PIPES)
 440                 return -EINVAL;
 441
 442         gpu = priv->gpu[args->pipe];
 443         if (!gpu)
 444                 return -ENXIO;
 445
 446         if (args->stream_size % 4) {
 447                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 448                           args->stream_size);
 449                 return -EINVAL;
 450         }
 451
 452         if (args->exec_state != ETNA_PIPE_3D &&
 453             args->exec_state != ETNA_PIPE_2D &&
 454             args->exec_state != ETNA_PIPE_VG) {
 455                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 456                 return -EINVAL;
 457         }
 458
 459         if (args->flags & ~ETNA_SUBMIT_FLAGS) {
 460                 DRM_ERROR("invalid flags: 0x%x\n", args->flags);
 461                 return -EINVAL;
 462         }
 463
 464         if ((args->flags & ETNA_SUBMIT_SOFTPIN) &&
 465             priv->mmu_global->version != ETNAVIV_IOMMU_V2) {
 466                 DRM_ERROR("softpin requested on incompatible MMU\n");
 467                 return -EINVAL;
 468         }
 469
 470         /*
 471          * Copy the command submission and bo array to kernel space in
 472          * one go, and do this outside of any locks.
 473          */
 474         bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
 475         relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
 476         pmrs = kvmalloc_array(args->nr_pmrs, sizeof(*pmrs), GFP_KERNEL);
 477         stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
 478         if (!bos || !relocs || !pmrs || !stream) {
 479                 ret = -ENOMEM;
 480                 goto err_submit_cmds;
 481         }
 482
 483         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 484                              args->nr_bos * sizeof(*bos));
 485         if (ret) {
 486                 ret = -EFAULT;
 487                 goto err_submit_cmds;
 488         }
 489
 490         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 491                              args->nr_relocs * sizeof(*relocs));
 492         if (ret) {
 493                 ret = -EFAULT;
 494                 goto err_submit_cmds;
 495         }
 496
 497         ret = copy_from_user(pmrs, u64_to_user_ptr(args->pmrs),
 498                              args->nr_pmrs * sizeof(*pmrs));
 499         if (ret) {
 500                 ret = -EFAULT;
 501                 goto err_submit_cmds;
 502         }
 503
 504         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 505                              args->stream_size);
 506         if (ret) {
 507                 ret = -EFAULT;
 508                 goto err_submit_cmds;
 509         }
 510
 511         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 512                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 513                 if (out_fence_fd < 0) {
 514                         ret = out_fence_fd;
 515                         goto err_submit_cmds;
 516                 }
 517         }
 518
 519         ww_acquire_init(&ticket, &reservation_ww_class);
 520
 521         submit = submit_create(dev, gpu, args->nr_bos, args->nr_pmrs);
 522         if (!submit) {
 523                 ret = -ENOMEM;
 524                 goto err_submit_ww_acquire;
 525         }
 526
 527         ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &submit->cmdbuf,
 528                                   ALIGN(args->stream_size, 8) + 8);
 529         if (ret)
 530                 goto err_submit_objects;
 531
 532         submit->ctx = file->driver_priv;
 533         etnaviv_iommu_context_get(submit->ctx->mmu);
 534         submit->mmu_context = submit->ctx->mmu;
 535         submit->exec_state = args->exec_state;
 536         submit->flags = args->flags;
 537
 538         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 539         if (ret)
 540                 goto err_submit_objects;
 541
 542         if ((priv->mmu_global->version != ETNAVIV_IOMMU_V2) &&
 543             !etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 544                                       relocs, args->nr_relocs)) {
 545                 ret = -EINVAL;
 546                 goto err_submit_objects;
 547         }
 548
 549         if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 550                 submit->in_fence = sync_file_get_fence(args->fence_fd);
 551                 if (!submit->in_fence) {
 552                         ret = -EINVAL;
 553                         goto err_submit_objects;
 554                 }
 555         }
 556
 557         ret = submit_pin_objects(submit);
 558         if (ret)
 559                 goto err_submit_objects;
 560
 561         ret = submit_reloc(submit, stream, args->stream_size / 4,
 562                            relocs, args->nr_relocs);
 563         if (ret)
 564                 goto err_submit_objects;
 565
 566         ret = submit_perfmon_validate(submit, args->exec_state, pmrs);
 567         if (ret)
 568                 goto err_submit_objects;
 569
 570         memcpy(submit->cmdbuf.vaddr, stream, args->stream_size);
 571
 572         ret = submit_lock_objects(submit, &ticket);
 573         if (ret)
 574                 goto err_submit_objects;
 575
 576         ret = submit_fence_sync(submit);
 577         if (ret)
 578                 goto err_submit_objects;
 579
 580         ret = etnaviv_sched_push_job(&ctx->sched_entity[args->pipe], submit);
 581         if (ret)
 582                 goto err_submit_objects;
 583
 584         submit_attach_object_fences(submit);
 585
 586         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 587                 /*
 588                  * This can be improved: ideally we want to allocate the sync
 589                  * file before kicking off the GPU job and just attach the
 590                  * fence to the sync file here, eliminating the ENOMEM
 591                  * possibility at this stage.
 592                  */
 593                 sync_file = sync_file_create(submit->out_fence);
 594                 if (!sync_file) {
 595                         ret = -ENOMEM;
 596                         goto err_submit_objects;
 597                 }
 598                 fd_install(out_fence_fd, sync_file->file);
 599         }
 600
 601         args->fence_fd = out_fence_fd;
 602         args->fence = submit->out_fence_id;
 603
 604 err_submit_objects:
 605         etnaviv_submit_put(submit);
 606
 607 err_submit_ww_acquire:
 608         ww_acquire_fini(&ticket);
 609
 610 err_submit_cmds:
 611         if (ret && (out_fence_fd >= 0))
 612                 put_unused_fd(out_fence_fd);
 613         if (stream)
 614                 kvfree(stream);
 615         if (bos)
 616                 kvfree(bos);
 617         if (relocs)
 618                 kvfree(relocs);
 619         if (pmrs)
 620                 kvfree(pmrs);
 621
 622         return ret;
 623 }