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