drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/dma-fence-array.h>
  18 #include <linux/reservation.h>
  19 #include <linux/sync_file.h>
  20 #include "etnaviv_cmdbuf.h"
  21 #include "etnaviv_drv.h"
  22 #include "etnaviv_gpu.h"
  23 #include "etnaviv_gem.h"
  24 #include "etnaviv_perfmon.h"
  25
  26 /*
  27  * Cmdstream submission:
  28  */
  29
  30 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
  31 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
  32 #define BO_LOCKED   0x4000
  33 #define BO_PINNED   0x2000
  34
  35 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  36                 struct etnaviv_gpu *gpu, size_t nr_bos, size_t nr_pmrs)
  37 {
  38         struct etnaviv_gem_submit *submit;
  39         size_t sz = size_vstruct(nr_bos, sizeof(submit->bos[0]), sizeof(*submit));
  40
  41         submit = kzalloc(sz, GFP_KERNEL);
  42         if (!submit)
  43                 return NULL;
  44
  45         submit->pmrs = kcalloc(nr_pmrs, sizeof(struct etnaviv_perfmon_request),
  46                                GFP_KERNEL);
  47         if (!submit->pmrs) {
  48                 kfree(submit);
  49                 return NULL;
  50         }
  51         submit->nr_pmrs = nr_pmrs;
  52
  53         submit->gpu = gpu;
  54         kref_init(&submit->refcount);
  55
  56         return submit;
  57 }
  58
  59 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  60         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  61         unsigned nr_bos)
  62 {
  63         struct drm_etnaviv_gem_submit_bo *bo;
  64         unsigned i;
  65         int ret = 0;
  66
  67         spin_lock(&file->table_lock);
  68
  69         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  70                 struct drm_gem_object *obj;
  71
  72                 if (bo->flags & BO_INVALID_FLAGS) {
  73                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  74                         ret = -EINVAL;
  75                         goto out_unlock;
  76                 }
  77
  78                 submit->bos[i].flags = bo->flags;
  79
  80                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  81                  * all under single table_lock just hit object_idr directly:
  82                  */
  83                 obj = idr_find(&file->object_idr, bo->handle);
  84                 if (!obj) {
  85                         DRM_ERROR("invalid handle %u at index %u\n",
  86                                   bo->handle, i);
  87                         ret = -EINVAL;
  88                         goto out_unlock;
  89                 }
  90
  91                 /*
  92                  * Take a refcount on the object. The file table lock
  93                  * prevents the object_idr's refcount on this being dropped.
  94                  */
  95                 drm_gem_object_get(obj);
  96
  97                 submit->bos[i].obj = to_etnaviv_bo(obj);
  98         }
  99
 100 out_unlock:
 101         submit->nr_bos = i;
 102         spin_unlock(&file->table_lock);
 103
 104         return ret;
 105 }
 106
 107 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 108 {
 109         if (submit->bos[i].flags & BO_LOCKED) {
 110                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 111
 112                 ww_mutex_unlock(&etnaviv_obj->resv->lock);
 113                 submit->bos[i].flags &= ~BO_LOCKED;
 114         }
 115 }
 116
 117 static int submit_lock_objects(struct etnaviv_gem_submit *submit,
 118                 struct ww_acquire_ctx *ticket)
 119 {
 120         int contended, slow_locked = -1, i, ret = 0;
 121
 122 retry:
 123         for (i = 0; i < submit->nr_bos; i++) {
 124                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 125
 126                 if (slow_locked == i)
 127                         slow_locked = -1;
 128
 129                 contended = i;
 130
 131                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 132                         ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
 133                                                           ticket);
 134                         if (ret == -EALREADY)
 135                                 DRM_ERROR("BO at index %u already on submit list\n",
 136                                           i);
 137                         if (ret)
 138                                 goto fail;
 139                         submit->bos[i].flags |= BO_LOCKED;
 140                 }
 141         }
 142
 143         ww_acquire_done(ticket);
 144
 145         return 0;
 146
 147 fail:
 148         for (; i >= 0; i--)
 149                 submit_unlock_object(submit, i);
 150
 151         if (slow_locked > 0)
 152                 submit_unlock_object(submit, slow_locked);
 153
 154         if (ret == -EDEADLK) {
 155                 struct etnaviv_gem_object *etnaviv_obj;
 156
 157                 etnaviv_obj = submit->bos[contended].obj;
 158
 159                 /* we lost out in a seqno race, lock and retry.. */
 160                 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
 161                                                        ticket);
 162                 if (!ret) {
 163                         submit->bos[contended].flags |= BO_LOCKED;
 164                         slow_locked = contended;
 165                         goto retry;
 166                 }
 167         }
 168
 169         return ret;
 170 }
 171
 172 static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
 173 {
 174         unsigned int context = submit->gpu->fence_context;
 175         int i, ret = 0;
 176
 177         for (i = 0; i < submit->nr_bos; i++) {
 178                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 179                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 180                 bool explicit = !!(submit->flags & ETNA_SUBMIT_NO_IMPLICIT);
 181
 182                 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write,
 183                                                  explicit);
 184                 if (ret)
 185                         break;
 186         }
 187
 188         if (submit->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 189                 /*
 190                  * Wait if the fence is from a foreign context, or if the fence
 191                  * array contains any fence from a foreign context.
 192                  */
 193                 if (!dma_fence_match_context(submit->in_fence, context))
 194                         ret = dma_fence_wait(submit->in_fence, true);
 195         }
 196
 197         return ret;
 198 }
 199
 200 static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)
 201 {
 202         int i;
 203
 204         for (i = 0; i < submit->nr_bos; i++) {
 205                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 206
 207                 if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
 208                         reservation_object_add_excl_fence(etnaviv_obj->resv,
 209                                                           submit->out_fence);
 210                 else
 211                         reservation_object_add_shared_fence(etnaviv_obj->resv,
 212                                                             submit->out_fence);
 213
 214                 submit_unlock_object(submit, i);
 215         }
 216 }
 217
 218 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 219 {
 220         int i, ret = 0;
 221
 222         for (i = 0; i < submit->nr_bos; i++) {
 223                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 224                 struct etnaviv_vram_mapping *mapping;
 225
 226                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 227                                                   submit->gpu);
 228                 if (IS_ERR(mapping)) {
 229                         ret = PTR_ERR(mapping);
 230                         break;
 231                 }
 232                 atomic_inc(&etnaviv_obj->gpu_active);
 233
 234                 submit->bos[i].flags |= BO_PINNED;
 235                 submit->bos[i].mapping = mapping;
 236         }
 237
 238         return ret;
 239 }
 240
 241 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 242         struct etnaviv_gem_submit_bo **bo)
 243 {
 244         if (idx >= submit->nr_bos) {
 245                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 246                                 idx, submit->nr_bos);
 247                 return -EINVAL;
 248         }
 249
 250         *bo = &submit->bos[idx];
 251
 252         return 0;
 253 }
 254
 255 /* process the reloc's and patch up the cmdstream as needed: */
 256 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 257                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 258                 u32 nr_relocs)
 259 {
 260         u32 i, last_offset = 0;
 261         u32 *ptr = stream;
 262         int ret;
 263
 264         for (i = 0; i < nr_relocs; i++) {
 265                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 266                 struct etnaviv_gem_submit_bo *bo;
 267                 u32 off;
 268
 269                 if (unlikely(r->flags)) {
 270                         DRM_ERROR("invalid reloc flags\n");
 271                         return -EINVAL;
 272                 }
 273
 274                 if (r->submit_offset % 4) {
 275                         DRM_ERROR("non-aligned reloc offset: %u\n",
 276                                   r->submit_offset);
 277                         return -EINVAL;
 278                 }
 279
 280                 /* offset in dwords: */
 281                 off = r->submit_offset / 4;
 282
 283                 if ((off >= size ) ||
 284                                 (off < last_offset)) {
 285                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 286                         return -EINVAL;
 287                 }
 288
 289                 ret = submit_bo(submit, r->reloc_idx, &bo);
 290                 if (ret)
 291                         return ret;
 292
 293                 if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
 294                         DRM_ERROR("relocation %u outside object\n", i);
 295                         return -EINVAL;
 296                 }
 297
 298                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 299
 300                 last_offset = off;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int submit_perfmon_validate(struct etnaviv_gem_submit *submit,
 307                 u32 exec_state, const struct drm_etnaviv_gem_submit_pmr *pmrs)
 308 {
 309         u32 i;
 310
 311         for (i = 0; i < submit->nr_pmrs; i++) {
 312                 const struct drm_etnaviv_gem_submit_pmr *r = pmrs + i;
 313                 struct etnaviv_gem_submit_bo *bo;
 314                 int ret;
 315
 316                 ret = submit_bo(submit, r->read_idx, &bo);
 317                 if (ret)
 318                         return ret;
 319
 320                 /* at offset 0 a sequence number gets stored used for userspace sync */
 321                 if (r->read_offset == 0) {
 322                         DRM_ERROR("perfmon request: offset is 0");
 323                         return -EINVAL;
 324                 }
 325
 326                 if (r->read_offset >= bo->obj->base.size - sizeof(u32)) {
 327                         DRM_ERROR("perfmon request: offset %u outside object", i);
 328                         return -EINVAL;
 329                 }
 330
 331                 if (r->flags & ~(ETNA_PM_PROCESS_PRE | ETNA_PM_PROCESS_POST)) {
 332                         DRM_ERROR("perfmon request: flags are not valid");
 333                         return -EINVAL;
 334                 }
 335
 336                 if (etnaviv_pm_req_validate(r, exec_state)) {
 337                         DRM_ERROR("perfmon request: domain or signal not valid");
 338                         return -EINVAL;
 339                 }
 340
 341                 submit->pmrs[i].flags = r->flags;
 342                 submit->pmrs[i].domain = r->domain;
 343                 submit->pmrs[i].signal = r->signal;
 344                 submit->pmrs[i].sequence = r->sequence;
 345                 submit->pmrs[i].offset = r->read_offset;
 346                 submit->pmrs[i].bo_vma = etnaviv_gem_vmap(&bo->obj->base);
 347         }
 348
 349         return 0;
 350 }
 351
 352 static void submit_cleanup(struct kref *kref)
 353 {
 354         struct etnaviv_gem_submit *submit =
 355                         container_of(kref, struct etnaviv_gem_submit, refcount);
 356         unsigned i;
 357
 358         if (submit->runtime_resumed)
 359                 pm_runtime_put_autosuspend(submit->gpu->dev);
 360
 361         if (submit->cmdbuf.suballoc)
 362                 etnaviv_cmdbuf_free(&submit->cmdbuf);
 363
 364         for (i = 0; i < submit->nr_bos; i++) {
 365                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 366
 367                 /* unpin all objects */
 368                 if (submit->bos[i].flags & BO_PINNED) {
 369                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 370                         atomic_dec(&etnaviv_obj->gpu_active);
 371                         submit->bos[i].mapping = NULL;
 372                         submit->bos[i].flags &= ~BO_PINNED;
 373                 }
 374
 375                 /* if the GPU submit failed, objects might still be locked */
 376                 submit_unlock_object(submit, i);
 377                 drm_gem_object_put_unlocked(&etnaviv_obj->base);
 378         }
 379
 380         wake_up_all(&submit->gpu->fence_event);
 381
 382         if (submit->in_fence)
 383                 dma_fence_put(submit->in_fence);
 384         if (submit->out_fence)
 385                 dma_fence_put(submit->out_fence);
 386         kfree(submit->pmrs);
 387         kfree(submit);
 388 }
 389
 390 void etnaviv_submit_put(struct etnaviv_gem_submit *submit)
 391 {
 392         kref_put(&submit->refcount, submit_cleanup);
 393 }
 394
 395 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 396                 struct drm_file *file)
 397 {
 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->cmdbuf.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         ret = submit_lock_objects(submit, &ticket);
 507         if (ret)
 508                 goto err_submit_objects;
 509
 510         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 511                                       relocs, args->nr_relocs)) {
 512                 ret = -EINVAL;
 513                 goto err_submit_objects;
 514         }
 515
 516         if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 517                 submit->in_fence = sync_file_get_fence(args->fence_fd);
 518                 if (!submit->in_fence) {
 519                         ret = -EINVAL;
 520                         goto err_submit_objects;
 521                 }
 522         }
 523
 524         ret = submit_fence_sync(submit);
 525         if (ret)
 526                 goto err_submit_objects;
 527
 528         ret = submit_pin_objects(submit);
 529         if (ret)
 530                 goto err_submit_objects;
 531
 532         ret = submit_reloc(submit, stream, args->stream_size / 4,
 533                            relocs, args->nr_relocs);
 534         if (ret)
 535                 goto err_submit_objects;
 536
 537         ret = submit_perfmon_validate(submit, args->exec_state, pmrs);
 538         if (ret)
 539                 goto err_submit_objects;
 540
 541         memcpy(submit->cmdbuf.vaddr, stream, args->stream_size);
 542         submit->cmdbuf.user_size = ALIGN(args->stream_size, 8);
 543
 544         ret = etnaviv_gpu_submit(gpu, submit);
 545         if (ret)
 546                 goto err_submit_objects;
 547
 548         submit_attach_object_fences(submit);
 549
 550         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 551                 /*
 552                  * This can be improved: ideally we want to allocate the sync
 553                  * file before kicking off the GPU job and just attach the
 554                  * fence to the sync file here, eliminating the ENOMEM
 555                  * possibility at this stage.
 556                  */
 557                 sync_file = sync_file_create(submit->out_fence);
 558                 if (!sync_file) {
 559                         ret = -ENOMEM;
 560                         goto err_submit_objects;
 561                 }
 562                 fd_install(out_fence_fd, sync_file->file);
 563         }
 564
 565         args->fence_fd = out_fence_fd;
 566         args->fence = submit->out_fence->seqno;
 567
 568 err_submit_objects:
 569         etnaviv_submit_put(submit);
 570
 571 err_submit_ww_acquire:
 572         ww_acquire_fini(&ticket);
 573
 574 err_submit_cmds:
 575         if (ret && (out_fence_fd >= 0))
 576                 put_unused_fd(out_fence_fd);
 577         if (stream)
 578                 kvfree(stream);
 579         if (bos)
 580                 kvfree(bos);
 581         if (relocs)
 582                 kvfree(relocs);
 583         if (pmrs)
 584                 kvfree(pmrs);
 585
 586         return ret;
 587 }