drivers/gpu/drm/msm/msm_gem_submit.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/sync_file.h>
  19
  20 #include "msm_drv.h"
  21 #include "msm_gpu.h"
  22 #include "msm_gem.h"
  23
  24 /*
  25  * Cmdstream submission:
  26  */
  27
  28 /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */
  29 #define BO_VALID    0x8000   /* is current addr in cmdstream correct/valid? */
  30 #define BO_LOCKED   0x4000
  31 #define BO_PINNED   0x2000
  32
  33 static struct msm_gem_submit *submit_create(struct drm_device *dev,
  34                 struct msm_gpu *gpu, struct msm_gpu_submitqueue *queue,
  35                 uint32_t nr_bos, uint32_t nr_cmds)
  36 {
  37         struct msm_gem_submit *submit;
  38         uint64_t sz = sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) +
  39                 ((u64)nr_cmds * sizeof(submit->cmd[0]));
  40
  41         if (sz > SIZE_MAX)
  42                 return NULL;
  43
  44         submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
  45         if (!submit)
  46                 return NULL;
  47
  48         submit->dev = dev;
  49         submit->gpu = gpu;
  50         submit->fence = NULL;
  51         submit->pid = get_pid(task_pid(current));
  52         submit->cmd = (void *)&submit->bos[nr_bos];
  53         submit->queue = queue;
  54         submit->ring = gpu->rb[queue->prio];
  55
  56         /* initially, until copy_from_user() and bo lookup succeeds: */
  57         submit->nr_bos = 0;
  58         submit->nr_cmds = 0;
  59
  60         INIT_LIST_HEAD(&submit->node);
  61         INIT_LIST_HEAD(&submit->bo_list);
  62         ww_acquire_init(&submit->ticket, &reservation_ww_class);
  63
  64         return submit;
  65 }
  66
  67 void msm_gem_submit_free(struct msm_gem_submit *submit)
  68 {
  69         dma_fence_put(submit->fence);
  70         list_del(&submit->node);
  71         put_pid(submit->pid);
  72         msm_submitqueue_put(submit->queue);
  73
  74         kfree(submit);
  75 }
  76
  77 static inline unsigned long __must_check
  78 copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
  79 {
  80         if (access_ok(VERIFY_READ, from, n))
  81                 return __copy_from_user_inatomic(to, from, n);
  82         return -EFAULT;
  83 }
  84
  85 static int submit_lookup_objects(struct msm_gem_submit *submit,
  86                 struct drm_msm_gem_submit *args, struct drm_file *file)
  87 {
  88         unsigned i;
  89         int ret = 0;
  90
  91         spin_lock(&file->table_lock);
  92         pagefault_disable();
  93
  94         for (i = 0; i < args->nr_bos; i++) {
  95                 struct drm_msm_gem_submit_bo submit_bo;
  96                 struct drm_gem_object *obj;
  97                 struct msm_gem_object *msm_obj;
  98                 void __user *userptr =
  99                         u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
 100
 101                 /* make sure we don't have garbage flags, in case we hit
 102                  * error path before flags is initialized:
 103                  */
 104                 submit->bos[i].flags = 0;
 105
 106                 if (copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo))) {
 107                         pagefault_enable();
 108                         spin_unlock(&file->table_lock);
 109                         if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
 110                                 ret = -EFAULT;
 111                                 goto out;
 112                         }
 113                         spin_lock(&file->table_lock);
 114                         pagefault_disable();
 115                 }
 116
 117                 if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) ||
 118                         !(submit_bo.flags & MSM_SUBMIT_BO_FLAGS)) {
 119                         DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
 120                         ret = -EINVAL;
 121                         goto out_unlock;
 122                 }
 123
 124                 submit->bos[i].flags = submit_bo.flags;
 125                 /* in validate_objects() we figure out if this is true: */
 126                 submit->bos[i].iova  = submit_bo.presumed;
 127
 128                 /* normally use drm_gem_object_lookup(), but for bulk lookup
 129                  * all under single table_lock just hit object_idr directly:
 130                  */
 131                 obj = idr_find(&file->object_idr, submit_bo.handle);
 132                 if (!obj) {
 133                         DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i);
 134                         ret = -EINVAL;
 135                         goto out_unlock;
 136                 }
 137
 138                 msm_obj = to_msm_bo(obj);
 139
 140                 if (!list_empty(&msm_obj->submit_entry)) {
 141                         DRM_ERROR("handle %u at index %u already on submit list\n",
 142                                         submit_bo.handle, i);
 143                         ret = -EINVAL;
 144                         goto out_unlock;
 145                 }
 146
 147                 drm_gem_object_reference(obj);
 148
 149                 submit->bos[i].obj = msm_obj;
 150
 151                 list_add_tail(&msm_obj->submit_entry, &submit->bo_list);
 152         }
 153
 154 out_unlock:
 155         pagefault_enable();
 156         spin_unlock(&file->table_lock);
 157
 158 out:
 159         submit->nr_bos = i;
 160
 161         return ret;
 162 }
 163
 164 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit,
 165                 int i, bool backoff)
 166 {
 167         struct msm_gem_object *msm_obj = submit->bos[i].obj;
 168
 169         if (submit->bos[i].flags & BO_PINNED)
 170                 msm_gem_put_iova(&msm_obj->base, submit->gpu->aspace);
 171
 172         if (submit->bos[i].flags & BO_LOCKED)
 173                 ww_mutex_unlock(&msm_obj->resv->lock);
 174
 175         if (backoff && !(submit->bos[i].flags & BO_VALID))
 176                 submit->bos[i].iova = 0;
 177
 178         submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED);
 179 }
 180
 181 /* This is where we make sure all the bo's are reserved and pin'd: */
 182 static int submit_lock_objects(struct msm_gem_submit *submit)
 183 {
 184         int contended, slow_locked = -1, i, ret = 0;
 185
 186 retry:
 187         for (i = 0; i < submit->nr_bos; i++) {
 188                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 189
 190                 if (slow_locked == i)
 191                         slow_locked = -1;
 192
 193                 contended = i;
 194
 195                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 196                         ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock,
 197                                         &submit->ticket);
 198                         if (ret)
 199                                 goto fail;
 200                         submit->bos[i].flags |= BO_LOCKED;
 201                 }
 202         }
 203
 204         ww_acquire_done(&submit->ticket);
 205
 206         return 0;
 207
 208 fail:
 209         for (; i >= 0; i--)
 210                 submit_unlock_unpin_bo(submit, i, true);
 211
 212         if (slow_locked > 0)
 213                 submit_unlock_unpin_bo(submit, slow_locked, true);
 214
 215         if (ret == -EDEADLK) {
 216                 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
 217                 /* we lost out in a seqno race, lock and retry.. */
 218                 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock,
 219                                 &submit->ticket);
 220                 if (!ret) {
 221                         submit->bos[contended].flags |= BO_LOCKED;
 222                         slow_locked = contended;
 223                         goto retry;
 224                 }
 225         }
 226
 227         return ret;
 228 }
 229
 230 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
 231 {
 232         int i, ret = 0;
 233
 234         for (i = 0; i < submit->nr_bos; i++) {
 235                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 236                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 237
 238                 if (!write) {
 239                         /* NOTE: _reserve_shared() must happen before
 240                          * _add_shared_fence(), which makes this a slightly
 241                          * strange place to call it.  OTOH this is a
 242                          * convenient can-fail point to hook it in.
 243                          */
 244                         ret = reservation_object_reserve_shared(msm_obj->resv);
 245                         if (ret)
 246                                 return ret;
 247                 }
 248
 249                 if (no_implicit)
 250                         continue;
 251
 252                 ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx,
 253                         write);
 254                 if (ret)
 255                         break;
 256         }
 257
 258         return ret;
 259 }
 260
 261 static int submit_pin_objects(struct msm_gem_submit *submit)
 262 {
 263         int i, ret = 0;
 264
 265         submit->valid = true;
 266
 267         for (i = 0; i < submit->nr_bos; i++) {
 268                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 269                 uint64_t iova;
 270
 271                 /* if locking succeeded, pin bo: */
 272                 ret = msm_gem_get_iova(&msm_obj->base,
 273                                 submit->gpu->aspace, &iova);
 274
 275                 if (ret)
 276                         break;
 277
 278                 submit->bos[i].flags |= BO_PINNED;
 279
 280                 if (iova == submit->bos[i].iova) {
 281                         submit->bos[i].flags |= BO_VALID;
 282                 } else {
 283                         submit->bos[i].iova = iova;
 284                         /* iova changed, so address in cmdstream is not valid: */
 285                         submit->bos[i].flags &= ~BO_VALID;
 286                         submit->valid = false;
 287                 }
 288         }
 289
 290         return ret;
 291 }
 292
 293 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 294                 struct msm_gem_object **obj, uint64_t *iova, bool *valid)
 295 {
 296         if (idx >= submit->nr_bos) {
 297                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 298                                 idx, submit->nr_bos);
 299                 return -EINVAL;
 300         }
 301
 302         if (obj)
 303                 *obj = submit->bos[idx].obj;
 304         if (iova)
 305                 *iova = submit->bos[idx].iova;
 306         if (valid)
 307                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 308
 309         return 0;
 310 }
 311
 312 /* process the reloc's and patch up the cmdstream as needed: */
 313 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
 314                 uint32_t offset, uint32_t nr_relocs, uint64_t relocs)
 315 {
 316         uint32_t i, last_offset = 0;
 317         uint32_t *ptr;
 318         int ret = 0;
 319
 320         if (offset % 4) {
 321                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 322                 return -EINVAL;
 323         }
 324
 325         /* For now, just map the entire thing.  Eventually we probably
 326          * to do it page-by-page, w/ kmap() if not vmap()d..
 327          */
 328         ptr = msm_gem_get_vaddr(&obj->base);
 329
 330         if (IS_ERR(ptr)) {
 331                 ret = PTR_ERR(ptr);
 332                 DBG("failed to map: %d", ret);
 333                 return ret;
 334         }
 335
 336         for (i = 0; i < nr_relocs; i++) {
 337                 struct drm_msm_gem_submit_reloc submit_reloc;
 338                 void __user *userptr =
 339                         u64_to_user_ptr(relocs + (i * sizeof(submit_reloc)));
 340                 uint32_t off;
 341                 uint64_t iova;
 342                 bool valid;
 343
 344                 if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) {
 345                         ret = -EFAULT;
 346                         goto out;
 347                 }
 348
 349                 if (submit_reloc.submit_offset % 4) {
 350                         DRM_ERROR("non-aligned reloc offset: %u\n",
 351                                         submit_reloc.submit_offset);
 352                         ret = -EINVAL;
 353                         goto out;
 354                 }
 355
 356                 /* offset in dwords: */
 357                 off = submit_reloc.submit_offset / 4;
 358
 359                 if ((off >= (obj->base.size / 4)) ||
 360                                 (off < last_offset)) {
 361                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 362                         ret = -EINVAL;
 363                         goto out;
 364                 }
 365
 366                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 367                 if (ret)
 368                         goto out;
 369
 370                 if (valid)
 371                         continue;
 372
 373                 iova += submit_reloc.reloc_offset;
 374
 375                 if (submit_reloc.shift < 0)
 376                         iova >>= -submit_reloc.shift;
 377                 else
 378                         iova <<= submit_reloc.shift;
 379
 380                 ptr[off] = iova | submit_reloc.or;
 381
 382                 last_offset = off;
 383         }
 384
 385 out:
 386         msm_gem_put_vaddr(&obj->base);
 387
 388         return ret;
 389 }
 390
 391 static void submit_cleanup(struct msm_gem_submit *submit)
 392 {
 393         unsigned i;
 394
 395         for (i = 0; i < submit->nr_bos; i++) {
 396                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 397                 submit_unlock_unpin_bo(submit, i, false);
 398                 list_del_init(&msm_obj->submit_entry);
 399                 drm_gem_object_unreference(&msm_obj->base);
 400         }
 401
 402         ww_acquire_fini(&submit->ticket);
 403 }
 404
 405 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 406                 struct drm_file *file)
 407 {
 408         struct msm_drm_private *priv = dev->dev_private;
 409         struct drm_msm_gem_submit *args = data;
 410         struct msm_file_private *ctx = file->driver_priv;
 411         struct msm_gem_submit *submit;
 412         struct msm_gpu *gpu = priv->gpu;
 413         struct dma_fence *in_fence = NULL;
 414         struct sync_file *sync_file = NULL;
 415         struct msm_gpu_submitqueue *queue;
 416         struct msm_ringbuffer *ring;
 417         int out_fence_fd = -1;
 418         unsigned i;
 419         int ret;
 420
 421         if (!gpu)
 422                 return -ENXIO;
 423
 424         /* for now, we just have 3d pipe.. eventually this would need to
 425          * be more clever to dispatch to appropriate gpu module:
 426          */
 427         if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0)
 428                 return -EINVAL;
 429
 430         if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS)
 431                 return -EINVAL;
 432
 433         if (args->flags & MSM_SUBMIT_SUDO) {
 434                 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) ||
 435                     !capable(CAP_SYS_RAWIO))
 436                         return -EINVAL;
 437         }
 438
 439         queue = msm_submitqueue_get(ctx, args->queueid);
 440         if (!queue)
 441                 return -ENOENT;
 442
 443         ring = gpu->rb[queue->prio];
 444
 445         if (args->flags & MSM_SUBMIT_FENCE_FD_IN) {
 446                 in_fence = sync_file_get_fence(args->fence_fd);
 447
 448                 if (!in_fence)
 449                         return -EINVAL;
 450
 451                 /*
 452                  * Wait if the fence is from a foreign context, or if the fence
 453                  * array contains any fence from a foreign context.
 454                  */
 455                 if (!dma_fence_match_context(in_fence, ring->fctx->context)) {
 456                         ret = dma_fence_wait(in_fence, true);
 457                         if (ret)
 458                                 return ret;
 459                 }
 460         }
 461
 462         ret = mutex_lock_interruptible(&dev->struct_mutex);
 463         if (ret)
 464                 return ret;
 465
 466         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 467                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 468                 if (out_fence_fd < 0) {
 469                         ret = out_fence_fd;
 470                         goto out_unlock;
 471                 }
 472         }
 473
 474         submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds);
 475         if (!submit) {
 476                 ret = -ENOMEM;
 477                 goto out_unlock;
 478         }
 479
 480         if (args->flags & MSM_SUBMIT_SUDO)
 481                 submit->in_rb = true;
 482
 483         ret = submit_lookup_objects(submit, args, file);
 484         if (ret)
 485                 goto out;
 486
 487         ret = submit_lock_objects(submit);
 488         if (ret)
 489                 goto out;
 490
 491         ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT));
 492         if (ret)
 493                 goto out;
 494
 495         ret = submit_pin_objects(submit);
 496         if (ret)
 497                 goto out;
 498
 499         for (i = 0; i < args->nr_cmds; i++) {
 500                 struct drm_msm_gem_submit_cmd submit_cmd;
 501                 void __user *userptr =
 502                         u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
 503                 struct msm_gem_object *msm_obj;
 504                 uint64_t iova;
 505
 506                 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
 507                 if (ret) {
 508                         ret = -EFAULT;
 509                         goto out;
 510                 }
 511
 512                 /* validate input from userspace: */
 513                 switch (submit_cmd.type) {
 514                 case MSM_SUBMIT_CMD_BUF:
 515                 case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 516                 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 517                         break;
 518                 default:
 519                         DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
 520                         ret = -EINVAL;
 521                         goto out;
 522                 }
 523
 524                 ret = submit_bo(submit, submit_cmd.submit_idx,
 525                                 &msm_obj, &iova, NULL);
 526                 if (ret)
 527                         goto out;
 528
 529                 if (submit_cmd.size % 4) {
 530                         DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 531                                         submit_cmd.size);
 532                         ret = -EINVAL;
 533                         goto out;
 534                 }
 535
 536                 if (!submit_cmd.size ||
 537                         ((submit_cmd.size + submit_cmd.submit_offset) >
 538                                 msm_obj->base.size)) {
 539                         DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size);
 540                         ret = -EINVAL;
 541                         goto out;
 542                 }
 543
 544                 submit->cmd[i].type = submit_cmd.type;
 545                 submit->cmd[i].size = submit_cmd.size / 4;
 546                 submit->cmd[i].iova = iova + submit_cmd.submit_offset;
 547                 submit->cmd[i].idx  = submit_cmd.submit_idx;
 548
 549                 if (submit->valid)
 550                         continue;
 551
 552                 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset,
 553                                 submit_cmd.nr_relocs, submit_cmd.relocs);
 554                 if (ret)
 555                         goto out;
 556         }
 557
 558         submit->nr_cmds = i;
 559
 560         submit->fence = msm_fence_alloc(ring->fctx);
 561         if (IS_ERR(submit->fence)) {
 562                 ret = PTR_ERR(submit->fence);
 563                 submit->fence = NULL;
 564                 goto out;
 565         }
 566
 567         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 568                 sync_file = sync_file_create(submit->fence);
 569                 if (!sync_file) {
 570                         ret = -ENOMEM;
 571                         goto out;
 572                 }
 573         }
 574
 575         msm_gpu_submit(gpu, submit, ctx);
 576
 577         args->fence = submit->fence->seqno;
 578
 579         if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) {
 580                 fd_install(out_fence_fd, sync_file->file);
 581                 args->fence_fd = out_fence_fd;
 582         }
 583
 584 out:
 585         if (in_fence)
 586                 dma_fence_put(in_fence);
 587         submit_cleanup(submit);
 588         if (ret)
 589                 msm_gem_submit_free(submit);
 590 out_unlock:
 591         if (ret && (out_fence_fd >= 0))
 592                 put_unused_fd(out_fence_fd);
 593         mutex_unlock(&dev->struct_mutex);
 594         return ret;
 595 }