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