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 #include "msm_gpu_trace.h" 24 25 /* 26 * Cmdstream submission: 27 */ 28 29 /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */ 30 #define BO_VALID 0x8000 /* is current addr in cmdstream correct/valid? */ 31 #define BO_LOCKED 0x4000 32 #define BO_PINNED 0x2000 33 34 static struct msm_gem_submit *submit_create(struct drm_device *dev, 35 struct msm_gpu *gpu, struct msm_gpu_submitqueue *queue, 36 uint32_t nr_bos, uint32_t nr_cmds) 37 { 38 struct msm_gem_submit *submit; 39 uint64_t sz = sizeof(*submit) + ((u64)nr_bos * sizeof(submit->bos[0])) + 40 ((u64)nr_cmds * sizeof(submit->cmd[0])); 41 42 if (sz > SIZE_MAX) 43 return NULL; 44 45 submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); 46 if (!submit) 47 return NULL; 48 49 submit->dev = dev; 50 submit->gpu = gpu; 51 submit->fence = NULL; 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(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 /* at least one of READ and/or WRITE flags should be set: */ 118 #define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE) 119 120 if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) || 121 !(submit_bo.flags & MANDATORY_FLAGS)) { 122 DRM_ERROR("invalid flags: %x\n", submit_bo.flags); 123 ret = -EINVAL; 124 goto out_unlock; 125 } 126 127 submit->bos[i].flags = submit_bo.flags; 128 /* in validate_objects() we figure out if this is true: */ 129 submit->bos[i].iova = submit_bo.presumed; 130 131 /* normally use drm_gem_object_lookup(), but for bulk lookup 132 * all under single table_lock just hit object_idr directly: 133 */ 134 obj = idr_find(&file->object_idr, submit_bo.handle); 135 if (!obj) { 136 DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i); 137 ret = -EINVAL; 138 goto out_unlock; 139 } 140 141 msm_obj = to_msm_bo(obj); 142 143 if (!list_empty(&msm_obj->submit_entry)) { 144 DRM_ERROR("handle %u at index %u already on submit list\n", 145 submit_bo.handle, i); 146 ret = -EINVAL; 147 goto out_unlock; 148 } 149 150 drm_gem_object_get(obj); 151 152 submit->bos[i].obj = msm_obj; 153 154 list_add_tail(&msm_obj->submit_entry, &submit->bo_list); 155 } 156 157 out_unlock: 158 pagefault_enable(); 159 spin_unlock(&file->table_lock); 160 161 out: 162 submit->nr_bos = i; 163 164 return ret; 165 } 166 167 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, 168 int i, bool backoff) 169 { 170 struct msm_gem_object *msm_obj = submit->bos[i].obj; 171 172 if (submit->bos[i].flags & BO_PINNED) 173 msm_gem_unpin_iova(&msm_obj->base, submit->gpu->aspace); 174 175 if (submit->bos[i].flags & BO_LOCKED) 176 ww_mutex_unlock(&msm_obj->resv->lock); 177 178 if (backoff && !(submit->bos[i].flags & BO_VALID)) 179 submit->bos[i].iova = 0; 180 181 submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED); 182 } 183 184 /* This is where we make sure all the bo's are reserved and pin'd: */ 185 static int submit_lock_objects(struct msm_gem_submit *submit) 186 { 187 int contended, slow_locked = -1, i, ret = 0; 188 189 retry: 190 for (i = 0; i < submit->nr_bos; i++) { 191 struct msm_gem_object *msm_obj = submit->bos[i].obj; 192 193 if (slow_locked == i) 194 slow_locked = -1; 195 196 contended = i; 197 198 if (!(submit->bos[i].flags & BO_LOCKED)) { 199 ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock, 200 &submit->ticket); 201 if (ret) 202 goto fail; 203 submit->bos[i].flags |= BO_LOCKED; 204 } 205 } 206 207 ww_acquire_done(&submit->ticket); 208 209 return 0; 210 211 fail: 212 for (; i >= 0; i--) 213 submit_unlock_unpin_bo(submit, i, true); 214 215 if (slow_locked > 0) 216 submit_unlock_unpin_bo(submit, slow_locked, true); 217 218 if (ret == -EDEADLK) { 219 struct msm_gem_object *msm_obj = submit->bos[contended].obj; 220 /* we lost out in a seqno race, lock and retry.. */ 221 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock, 222 &submit->ticket); 223 if (!ret) { 224 submit->bos[contended].flags |= BO_LOCKED; 225 slow_locked = contended; 226 goto retry; 227 } 228 } 229 230 return ret; 231 } 232 233 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit) 234 { 235 int i, ret = 0; 236 237 for (i = 0; i < submit->nr_bos; i++) { 238 struct msm_gem_object *msm_obj = submit->bos[i].obj; 239 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE; 240 241 if (!write) { 242 /* NOTE: _reserve_shared() must happen before 243 * _add_shared_fence(), which makes this a slightly 244 * strange place to call it. OTOH this is a 245 * convenient can-fail point to hook it in. 246 */ 247 ret = reservation_object_reserve_shared(msm_obj->resv, 248 1); 249 if (ret) 250 return ret; 251 } 252 253 if (no_implicit) 254 continue; 255 256 ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx, 257 write); 258 if (ret) 259 break; 260 } 261 262 return ret; 263 } 264 265 static int submit_pin_objects(struct msm_gem_submit *submit) 266 { 267 int i, ret = 0; 268 269 submit->valid = true; 270 271 for (i = 0; i < submit->nr_bos; i++) { 272 struct msm_gem_object *msm_obj = submit->bos[i].obj; 273 uint64_t iova; 274 275 /* if locking succeeded, pin bo: */ 276 ret = msm_gem_get_and_pin_iova(&msm_obj->base, 277 submit->gpu->aspace, &iova); 278 279 if (ret) 280 break; 281 282 submit->bos[i].flags |= BO_PINNED; 283 284 if (iova == submit->bos[i].iova) { 285 submit->bos[i].flags |= BO_VALID; 286 } else { 287 submit->bos[i].iova = iova; 288 /* iova changed, so address in cmdstream is not valid: */ 289 submit->bos[i].flags &= ~BO_VALID; 290 submit->valid = false; 291 } 292 } 293 294 return ret; 295 } 296 297 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx, 298 struct msm_gem_object **obj, uint64_t *iova, bool *valid) 299 { 300 if (idx >= submit->nr_bos) { 301 DRM_ERROR("invalid buffer index: %u (out of %u)\n", 302 idx, submit->nr_bos); 303 return -EINVAL; 304 } 305 306 if (obj) 307 *obj = submit->bos[idx].obj; 308 if (iova) 309 *iova = submit->bos[idx].iova; 310 if (valid) 311 *valid = !!(submit->bos[idx].flags & BO_VALID); 312 313 return 0; 314 } 315 316 /* process the reloc's and patch up the cmdstream as needed: */ 317 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj, 318 uint32_t offset, uint32_t nr_relocs, uint64_t relocs) 319 { 320 uint32_t i, last_offset = 0; 321 uint32_t *ptr; 322 int ret = 0; 323 324 if (!nr_relocs) 325 return 0; 326 327 if (offset % 4) { 328 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset); 329 return -EINVAL; 330 } 331 332 /* For now, just map the entire thing. Eventually we probably 333 * to do it page-by-page, w/ kmap() if not vmap()d.. 334 */ 335 ptr = msm_gem_get_vaddr(&obj->base); 336 337 if (IS_ERR(ptr)) { 338 ret = PTR_ERR(ptr); 339 DBG("failed to map: %d", ret); 340 return ret; 341 } 342 343 for (i = 0; i < nr_relocs; i++) { 344 struct drm_msm_gem_submit_reloc submit_reloc; 345 void __user *userptr = 346 u64_to_user_ptr(relocs + (i * sizeof(submit_reloc))); 347 uint32_t off; 348 uint64_t iova; 349 bool valid; 350 351 if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) { 352 ret = -EFAULT; 353 goto out; 354 } 355 356 if (submit_reloc.submit_offset % 4) { 357 DRM_ERROR("non-aligned reloc offset: %u\n", 358 submit_reloc.submit_offset); 359 ret = -EINVAL; 360 goto out; 361 } 362 363 /* offset in dwords: */ 364 off = submit_reloc.submit_offset / 4; 365 366 if ((off >= (obj->base.size / 4)) || 367 (off < last_offset)) { 368 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 369 ret = -EINVAL; 370 goto out; 371 } 372 373 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid); 374 if (ret) 375 goto out; 376 377 if (valid) 378 continue; 379 380 iova += submit_reloc.reloc_offset; 381 382 if (submit_reloc.shift < 0) 383 iova >>= -submit_reloc.shift; 384 else 385 iova <<= submit_reloc.shift; 386 387 ptr[off] = iova | submit_reloc.or; 388 389 last_offset = off; 390 } 391 392 out: 393 msm_gem_put_vaddr(&obj->base); 394 395 return ret; 396 } 397 398 static void submit_cleanup(struct msm_gem_submit *submit) 399 { 400 unsigned i; 401 402 for (i = 0; i < submit->nr_bos; i++) { 403 struct msm_gem_object *msm_obj = submit->bos[i].obj; 404 submit_unlock_unpin_bo(submit, i, false); 405 list_del_init(&msm_obj->submit_entry); 406 drm_gem_object_put(&msm_obj->base); 407 } 408 409 ww_acquire_fini(&submit->ticket); 410 } 411 412 int msm_ioctl_gem_submit(struct drm_device *dev, void *data, 413 struct drm_file *file) 414 { 415 static atomic_t ident = ATOMIC_INIT(0); 416 struct msm_drm_private *priv = dev->dev_private; 417 struct drm_msm_gem_submit *args = data; 418 struct msm_file_private *ctx = file->driver_priv; 419 struct msm_gem_submit *submit; 420 struct msm_gpu *gpu = priv->gpu; 421 struct sync_file *sync_file = NULL; 422 struct msm_gpu_submitqueue *queue; 423 struct msm_ringbuffer *ring; 424 int out_fence_fd = -1; 425 struct pid *pid = get_pid(task_pid(current)); 426 unsigned i; 427 int ret, submitid; 428 if (!gpu) 429 return -ENXIO; 430 431 /* for now, we just have 3d pipe.. eventually this would need to 432 * be more clever to dispatch to appropriate gpu module: 433 */ 434 if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0) 435 return -EINVAL; 436 437 if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS) 438 return -EINVAL; 439 440 if (args->flags & MSM_SUBMIT_SUDO) { 441 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) || 442 !capable(CAP_SYS_RAWIO)) 443 return -EINVAL; 444 } 445 446 queue = msm_submitqueue_get(ctx, args->queueid); 447 if (!queue) 448 return -ENOENT; 449 450 /* Get a unique identifier for the submission for logging purposes */ 451 submitid = atomic_inc_return(&ident) - 1; 452 453 ring = gpu->rb[queue->prio]; 454 trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid, 455 args->nr_bos, args->nr_cmds); 456 457 if (args->flags & MSM_SUBMIT_FENCE_FD_IN) { 458 struct dma_fence *in_fence; 459 460 in_fence = sync_file_get_fence(args->fence_fd); 461 462 if (!in_fence) 463 return -EINVAL; 464 465 /* 466 * Wait if the fence is from a foreign context, or if the fence 467 * array contains any fence from a foreign context. 468 */ 469 ret = 0; 470 if (!dma_fence_match_context(in_fence, ring->fctx->context)) 471 ret = dma_fence_wait(in_fence, true); 472 473 dma_fence_put(in_fence); 474 if (ret) 475 return ret; 476 } 477 478 ret = mutex_lock_interruptible(&dev->struct_mutex); 479 if (ret) 480 return ret; 481 482 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 483 out_fence_fd = get_unused_fd_flags(O_CLOEXEC); 484 if (out_fence_fd < 0) { 485 ret = out_fence_fd; 486 goto out_unlock; 487 } 488 } 489 490 submit = submit_create(dev, gpu, queue, args->nr_bos, args->nr_cmds); 491 if (!submit) { 492 ret = -ENOMEM; 493 goto out_unlock; 494 } 495 496 submit->pid = pid; 497 submit->ident = submitid; 498 499 if (args->flags & MSM_SUBMIT_SUDO) 500 submit->in_rb = true; 501 502 ret = submit_lookup_objects(submit, args, file); 503 if (ret) 504 goto out; 505 506 ret = submit_lock_objects(submit); 507 if (ret) 508 goto out; 509 510 ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT)); 511 if (ret) 512 goto out; 513 514 ret = submit_pin_objects(submit); 515 if (ret) 516 goto out; 517 518 for (i = 0; i < args->nr_cmds; i++) { 519 struct drm_msm_gem_submit_cmd submit_cmd; 520 void __user *userptr = 521 u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd))); 522 struct msm_gem_object *msm_obj; 523 uint64_t iova; 524 525 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd)); 526 if (ret) { 527 ret = -EFAULT; 528 goto out; 529 } 530 531 /* validate input from userspace: */ 532 switch (submit_cmd.type) { 533 case MSM_SUBMIT_CMD_BUF: 534 case MSM_SUBMIT_CMD_IB_TARGET_BUF: 535 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF: 536 break; 537 default: 538 DRM_ERROR("invalid type: %08x\n", submit_cmd.type); 539 ret = -EINVAL; 540 goto out; 541 } 542 543 ret = submit_bo(submit, submit_cmd.submit_idx, 544 &msm_obj, &iova, NULL); 545 if (ret) 546 goto out; 547 548 if (submit_cmd.size % 4) { 549 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 550 submit_cmd.size); 551 ret = -EINVAL; 552 goto out; 553 } 554 555 if (!submit_cmd.size || 556 ((submit_cmd.size + submit_cmd.submit_offset) > 557 msm_obj->base.size)) { 558 DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size); 559 ret = -EINVAL; 560 goto out; 561 } 562 563 submit->cmd[i].type = submit_cmd.type; 564 submit->cmd[i].size = submit_cmd.size / 4; 565 submit->cmd[i].iova = iova + submit_cmd.submit_offset; 566 submit->cmd[i].idx = submit_cmd.submit_idx; 567 568 if (submit->valid) 569 continue; 570 571 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset, 572 submit_cmd.nr_relocs, submit_cmd.relocs); 573 if (ret) 574 goto out; 575 } 576 577 submit->nr_cmds = i; 578 579 submit->fence = msm_fence_alloc(ring->fctx); 580 if (IS_ERR(submit->fence)) { 581 ret = PTR_ERR(submit->fence); 582 submit->fence = NULL; 583 goto out; 584 } 585 586 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 587 sync_file = sync_file_create(submit->fence); 588 if (!sync_file) { 589 ret = -ENOMEM; 590 goto out; 591 } 592 } 593 594 msm_gpu_submit(gpu, submit, ctx); 595 596 args->fence = submit->fence->seqno; 597 598 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 599 fd_install(out_fence_fd, sync_file->file); 600 args->fence_fd = out_fence_fd; 601 } 602 603 out: 604 submit_cleanup(submit); 605 if (ret) 606 msm_gem_submit_free(submit); 607 out_unlock: 608 if (ret && (out_fence_fd >= 0)) 609 put_unused_fd(out_fence_fd); 610 mutex_unlock(&dev->struct_mutex); 611 return ret; 612 } 613