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                 ret = dma_resv_reserve_fences(robj, 1);
 183                 if (ret)
 184                         return ret;
 185
 186                 if (submit->flags & ETNA_SUBMIT_NO_IMPLICIT)
 187                         continue;
 188
 189                 ret = drm_sched_job_add_implicit_dependencies(&submit->sched_job,
 190                                                               &bo->obj->base,
 191                                                               bo->flags & ETNA_SUBMIT_BO_WRITE);
 192                 if (ret)
 193                         return ret;
 194         }
 195
 196         return ret;
 197 }
 198
 199 static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)
 200 {
 201         int i;
 202
 203         for (i = 0; i < submit->nr_bos; i++) {
 204                 struct drm_gem_object *obj = &submit->bos[i].obj->base;
 205                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 206
 207                 dma_resv_add_fence(obj->resv, submit->out_fence, write ?
 208                                    DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
 209                 submit_unlock_object(submit, i);
 210         }
 211 }
 212
 213 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 214 {
 215         int i, ret = 0;
 216
 217         for (i = 0; i < submit->nr_bos; i++) {
 218                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 219                 struct etnaviv_vram_mapping *mapping;
 220
 221                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 222                                                   submit->mmu_context,
 223                                                   submit->bos[i].va);
 224                 if (IS_ERR(mapping)) {
 225                         ret = PTR_ERR(mapping);
 226                         break;
 227                 }
 228
 229                 if ((submit->flags & ETNA_SUBMIT_SOFTPIN) &&
 230                      submit->bos[i].va != mapping->iova) {
 231                         etnaviv_gem_mapping_unreference(mapping);
 232                         return -EINVAL;
 233                 }
 234
 235                 atomic_inc(&etnaviv_obj->gpu_active);
 236
 237                 submit->bos[i].flags |= BO_PINNED;
 238                 submit->bos[i].mapping = mapping;
 239         }
 240
 241         return ret;
 242 }
 243
 244 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 245         struct etnaviv_gem_submit_bo **bo)
 246 {
 247         if (idx >= submit->nr_bos) {
 248                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 249                                 idx, submit->nr_bos);
 250                 return -EINVAL;
 251         }
 252
 253         *bo = &submit->bos[idx];
 254
 255         return 0;
 256 }
 257
 258 /* process the reloc's and patch up the cmdstream as needed: */
 259 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 260                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 261                 u32 nr_relocs)
 262 {
 263         u32 i, last_offset = 0;
 264         u32 *ptr = stream;
 265         int ret;
 266
 267         /* Submits using softpin don't blend with relocs */
 268         if ((submit->flags & ETNA_SUBMIT_SOFTPIN) && nr_relocs != 0)
 269                 return -EINVAL;
 270
 271         for (i = 0; i < nr_relocs; i++) {
 272                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 273                 struct etnaviv_gem_submit_bo *bo;
 274                 u32 off;
 275
 276                 if (unlikely(r->flags)) {
 277                         DRM_ERROR("invalid reloc flags\n");
 278                         return -EINVAL;
 279                 }
 280
 281                 if (r->submit_offset % 4) {
 282                         DRM_ERROR("non-aligned reloc offset: %u\n",
 283                                   r->submit_offset);
 284                         return -EINVAL;
 285                 }
 286
 287                 /* offset in dwords: */
 288                 off = r->submit_offset / 4;
 289
 290                 if ((off >= size ) ||
 291                                 (off < last_offset)) {
 292                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 293                         return -EINVAL;
 294                 }
 295
 296                 ret = submit_bo(submit, r->reloc_idx, &bo);
 297                 if (ret)
 298                         return ret;
 299
 300                 if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
 301                         DRM_ERROR("relocation %u outside object\n", i);
 302                         return -EINVAL;
 303                 }
 304
 305                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 306
 307                 last_offset = off;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
 314                 u32 exec_state, const struct drm_etnaviv_gem_submit_pmr *pmrs)
 315 {
 316         u32 i;
 317
 318         for (i = 0; i < submit->nr_pmrs; i++) {
 319                 const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
 320                 struct etnaviv_gem_submit_bo *bo;
 321                 int ret;
 322
 323                 ret = submit_bo(submit, r->read_idx, &bo);
 324                 if (ret)
 325                         return ret;
 326
 327                 /* at offset 0 a sequence number gets stored used for userspace sync */
 328                 if (r->read_offset == 0) {
 329                         DRM_ERROR("perfmon request: offset is 0");
 330                         return -EINVAL;
 331                 }
 332
 333                 if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
 334                         DRM_ERROR("perfmon request: offset %u outside object", i);
 335                         return -EINVAL;
 336                 }
 337
 338                 if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
 339                         DRM_ERROR("perfmon request: flags are not valid");
 340                         return -EINVAL;
 341                 }
 342
 343                 if (etnaviv_pm_req_validate(r, exec_state)) {
 344                         DRM_ERROR("perfmon request: domain or signal not valid");
 345                         return -EINVAL;
 346                 }
 347
 348                 submit->pmrs[i].flags = r->flags;
 349                 submit->pmrs[i].domain = r->domain;
 350                 submit->pmrs[i].signal = r->signal;
 351                 submit->pmrs[i].sequence = r->sequence;
 352                 submit->pmrs[i].offset = r->read_offset;
 353                 submit->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
 354         }
 355
 356         return 0;
 357 }
 358
 359 static void submit_cleanup(struct kref *kref)
 360 {
 361         struct etnaviv_gem_submit *submit =
 362                         container_of(kref, struct etnaviv_gem_submit, refcount);
 363         unsigned i;
 364
 365         if (submit->runtime_resumed)
 366                 pm_runtime_put_autosuspend(submit->gpu->dev);
 367
 368         if (submit->cmdbuf.suballoc)
 369                 etnaviv_cmdbuf_free(&submit->cmdbuf);
 370
 371         if (submit->mmu_context)
 372                 etnaviv_iommu_context_put(submit->mmu_context);
 373
 374         if (submit->prev_mmu_context)
 375                 etnaviv_iommu_context_put(submit->prev_mmu_context);
 376
 377         for (i = 0; i < submit->nr_bos; i++) {
 378                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 379
 380                 /* unpin all objects */
 381                 if (submit->bos[i].flags & BO_PINNED) {
 382                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 383                         atomic_dec(&etnaviv_obj->gpu_active);
 384                         submit->bos[i].mapping = NULL;
 385                         submit->bos[i].flags &= ~BO_PINNED;
 386                 }
 387
 388                 /* if the GPU submit failed, objects might still be locked */
 389                 submit_unlock_object(submit, i);
 390                 drm_gem_object_put(&etnaviv_obj->base);
 391         }
 392
 393         wake_up_all(&submit->gpu->fence_event);
 394
 395         if (submit->out_fence) {
 396                 /* first remove from IDR, so fence can not be found anymore */
 397                 mutex_lock(&submit->gpu->fence_lock);
 398                 idr_remove(&submit->gpu->fence_idr, submit->out_fence_id);
 399                 mutex_unlock(&submit->gpu->fence_lock);
 400                 dma_fence_put(submit->out_fence);
 401         }
 402         kfree(submit->pmrs);
 403         kfree(submit);
 404 }
 405
 406 void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
 407 {
 408         kref_put(&submit->refcount, submit_cleanup);
 409 }
 410
 411 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 412                 struct drm_file *file)
 413 {
 414         struct etnaviv_file_private *ctx = file->driver_priv;
 415         struct etnaviv_drm_private *priv = dev->dev_private;
 416         struct drm_etnaviv_gem_submit *args = data;
 417         struct drm_etnaviv_gem_submit_reloc *relocs;
 418         struct drm_etnaviv_gem_submit_pmr *pmrs;
 419         struct drm_etnaviv_gem_submit_bo *bos;
 420         struct etnaviv_gem_submit *submit;
 421         struct etnaviv_gpu *gpu;
 422         struct sync_file *sync_file = NULL;
 423         struct ww_acquire_ctx ticket;
 424         int out_fence_fd = -1;
 425         void *stream;
 426         int ret;
 427
 428         if (args->pipe >= ETNA_MAX_PIPES)
 429                 return -EINVAL;
 430
 431         gpu = priv->gpu[args->pipe];
 432         if (!gpu)
 433                 return -ENXIO;
 434
 435         if (args->stream_size % 4) {
 436                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 437                           args->stream_size);
 438                 return -EINVAL;
 439         }
 440
 441         if (args->exec_state != ETNA_PIPE_3D &&
 442             args->exec_state != ETNA_PIPE_2D &&
 443             args->exec_state != ETNA_PIPE_VG) {
 444                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 445                 return -EINVAL;
 446         }
 447
 448         if (args->flags & ~ETNA_SUBMIT_FLAGS) {
 449                 DRM_ERROR("invalid flags: 0x%x\n", args->flags);
 450                 return -EINVAL;
 451         }
 452
 453         if ((args->flags & ETNA_SUBMIT_SOFTPIN) &&
 454             priv->mmu_global->version != ETNAVIV_IOMMU_V2) {
 455                 DRM_ERROR("softpin requested on incompatible MMU\n");
 456                 return -EINVAL;
 457         }
 458
 459         if (args->stream_size > SZ_128K || args->nr_relocs > SZ_128K ||
 460             args->nr_bos > SZ_128K || args->nr_pmrs > 128) {
 461                 DRM_ERROR("submit arguments out of size limits\n");
 462                 return -EINVAL;
 463         }
 464
 465         /*
 466          * Copy the command submission and bo array to kernel space in
 467          * one go, and do this outside of any locks.
 468          */
 469         bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
 470         relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
 471         pmrs = kvmalloc_array(args->nr_pmrs, sizeof(*pmrs), GFP_KERNEL);
 472         stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
 473         if (!bos || !relocs || !pmrs || !stream) {
 474                 ret = -ENOMEM;
 475                 goto err_submit_cmds;
 476         }
 477
 478         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 479                              args->nr_bos * sizeof(*bos));
 480         if (ret) {
 481                 ret = -EFAULT;
 482                 goto err_submit_cmds;
 483         }
 484
 485         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 486                              args->nr_relocs * sizeof(*relocs));
 487         if (ret) {
 488                 ret = -EFAULT;
 489                 goto err_submit_cmds;
 490         }
 491
 492         ret = copy_from_user(pmrs, u64_to_user_ptr(args->pmrs),
 493                              args->nr_pmrs * sizeof(*pmrs));
 494         if (ret) {
 495                 ret = -EFAULT;
 496                 goto err_submit_cmds;
 497         }
 498
 499         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 500                              args->stream_size);
 501         if (ret) {
 502                 ret = -EFAULT;
 503                 goto err_submit_cmds;
 504         }
 505
 506         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 507                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 508                 if (out_fence_fd < 0) {
 509                         ret = out_fence_fd;
 510                         goto err_submit_cmds;
 511                 }
 512         }
 513
 514         ww_acquire_init(&ticket, &reservation_ww_class);
 515
 516         submit = submit_create(dev, gpu, args->nr_bos, args->nr_pmrs);
 517         if (!submit) {
 518                 ret = -ENOMEM;
 519                 goto err_submit_ww_acquire;
 520         }
 521
 522         ret = etnaviv_cmdbuf_init(priv->cmdbuf_suballoc, &submit->cmdbuf,
 523                                   ALIGN(args->stream_size, 8) + 8);
 524         if (ret)
 525                 goto err_submit_put;
 526
 527         submit->ctx = file->driver_priv;
 528         submit->mmu_context = etnaviv_iommu_context_get(submit->ctx->mmu);
 529         submit->exec_state = args->exec_state;
 530         submit->flags = args->flags;
 531
 532         ret = drm_sched_job_init(&submit->sched_job,
 533                                  &ctx->sched_entity[args->pipe],
 534                                  submit->ctx);
 535         if (ret)
 536                 goto err_submit_put;
 537
 538         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 539         if (ret)
 540                 goto err_submit_job;
 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_job;
 547         }
 548
 549         if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 550                 struct dma_fence *in_fence = sync_file_get_fence(args->fence_fd);
 551                 if (!in_fence) {
 552                         ret = -EINVAL;
 553                         goto err_submit_job;
 554                 }
 555
 556                 ret = drm_sched_job_add_dependency(&submit->sched_job,
 557                                                    in_fence);
 558                 if (ret)
 559                         goto err_submit_job;
 560         }
 561
 562         ret = submit_pin_objects(submit);
 563         if (ret)
 564                 goto err_submit_job;
 565
 566         ret = submit_reloc(submit, stream, args->stream_size / 4,
 567                            relocs, args->nr_relocs);
 568         if (ret)
 569                 goto err_submit_job;
 570
 571         ret = submit_perfmon_validate(submit, args->exec_state, pmrs);
 572         if (ret)
 573                 goto err_submit_job;
 574
 575         memcpy(submit->cmdbuf.vaddr, stream, args->stream_size);
 576
 577         ret = submit_lock_objects(submit, &ticket);
 578         if (ret)
 579                 goto err_submit_job;
 580
 581         ret = submit_fence_sync(submit);
 582         if (ret)
 583                 goto err_submit_job;
 584
 585         ret = etnaviv_sched_push_job(submit);
 586         if (ret)
 587                 goto err_submit_job;
 588
 589         submit_attach_object_fences(submit);
 590
 591         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 592                 /*
 593                  * This can be improved: ideally we want to allocate the sync
 594                  * file before kicking off the GPU job and just attach the
 595                  * fence to the sync file here, eliminating the ENOMEM
 596                  * possibility at this stage.
 597                  */
 598                 sync_file = sync_file_create(submit->out_fence);
 599                 if (!sync_file) {
 600                         ret = -ENOMEM;
 601                         /*
 602                          * When this late error is hit, the submit has already
 603                          * been handed over to the scheduler. At this point
 604                          * the sched_job must not be cleaned up.
 605                          */
 606                         goto err_submit_put;
 607                 }
 608                 fd_install(out_fence_fd, sync_file->file);
 609         }
 610
 611         args->fence_fd = out_fence_fd;
 612         args->fence = submit->out_fence_id;
 613
 614 err_submit_job:
 615         if (ret)
 616                 drm_sched_job_cleanup(&submit->sched_job);
 617 err_submit_put:
 618         etnaviv_submit_put(submit);
 619
 620 err_submit_ww_acquire:
 621         ww_acquire_fini(&ticket);
 622
 623 err_submit_cmds:
 624         if (ret && (out_fence_fd >= 0))
 625                 put_unused_fd(out_fence_fd);
 626         kvfree(stream);
 627         kvfree(bos);
 628         kvfree(relocs);
 629         kvfree(pmrs);
 630
 631         return ret;
 632 }