1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <linux/file.h> 8 #include <linux/sync_file.h> 9 #include <linux/uaccess.h> 10 11 #include <drm/drm_file.h> 12 13 #include "msm_drv.h" 14 #include "msm_gpu.h" 15 #include "msm_gem.h" 16 #include "msm_gpu_trace.h" 17 18 /* 19 * Cmdstream submission: 20 */ 21 22 /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */ 23 #define BO_VALID 0x8000 /* is current addr in cmdstream correct/valid? */ 24 #define BO_LOCKED 0x4000 25 #define BO_PINNED 0x2000 26 27 static struct msm_gem_submit *submit_create(struct drm_device *dev, 28 struct msm_gpu *gpu, struct msm_gem_address_space *aspace, 29 struct msm_gpu_submitqueue *queue, uint32_t nr_bos, 30 uint32_t nr_cmds) 31 { 32 struct msm_gem_submit *submit; 33 uint64_t sz = struct_size(submit, bos, nr_bos) + 34 ((u64)nr_cmds * sizeof(submit->cmd[0])); 35 36 if (sz > SIZE_MAX) 37 return NULL; 38 39 submit = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); 40 if (!submit) 41 return NULL; 42 43 submit->dev = dev; 44 submit->aspace = aspace; 45 submit->gpu = gpu; 46 submit->fence = NULL; 47 submit->cmd = (void *)&submit->bos[nr_bos]; 48 submit->queue = queue; 49 submit->ring = gpu->rb[queue->prio]; 50 51 /* initially, until copy_from_user() and bo lookup succeeds: */ 52 submit->nr_bos = 0; 53 submit->nr_cmds = 0; 54 55 INIT_LIST_HEAD(&submit->node); 56 INIT_LIST_HEAD(&submit->bo_list); 57 58 return submit; 59 } 60 61 void msm_gem_submit_free(struct msm_gem_submit *submit) 62 { 63 dma_fence_put(submit->fence); 64 list_del(&submit->node); 65 put_pid(submit->pid); 66 msm_submitqueue_put(submit->queue); 67 68 kfree(submit); 69 } 70 71 static int submit_lookup_objects(struct msm_gem_submit *submit, 72 struct drm_msm_gem_submit *args, struct drm_file *file) 73 { 74 unsigned i; 75 int ret = 0; 76 77 for (i = 0; i < args->nr_bos; i++) { 78 struct drm_msm_gem_submit_bo submit_bo; 79 void __user *userptr = 80 u64_to_user_ptr(args->bos + (i * sizeof(submit_bo))); 81 82 /* make sure we don't have garbage flags, in case we hit 83 * error path before flags is initialized: 84 */ 85 submit->bos[i].flags = 0; 86 87 if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) { 88 ret = -EFAULT; 89 i = 0; 90 goto out; 91 } 92 93 /* at least one of READ and/or WRITE flags should be set: */ 94 #define MANDATORY_FLAGS (MSM_SUBMIT_BO_READ | MSM_SUBMIT_BO_WRITE) 95 96 if ((submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) || 97 !(submit_bo.flags & MANDATORY_FLAGS)) { 98 DRM_ERROR("invalid flags: %x\n", submit_bo.flags); 99 ret = -EINVAL; 100 i = 0; 101 goto out; 102 } 103 104 submit->bos[i].handle = submit_bo.handle; 105 submit->bos[i].flags = submit_bo.flags; 106 /* in validate_objects() we figure out if this is true: */ 107 submit->bos[i].iova = submit_bo.presumed; 108 } 109 110 spin_lock(&file->table_lock); 111 112 for (i = 0; i < args->nr_bos; i++) { 113 struct drm_gem_object *obj; 114 struct msm_gem_object *msm_obj; 115 116 /* normally use drm_gem_object_lookup(), but for bulk lookup 117 * all under single table_lock just hit object_idr directly: 118 */ 119 obj = idr_find(&file->object_idr, submit->bos[i].handle); 120 if (!obj) { 121 DRM_ERROR("invalid handle %u at index %u\n", submit->bos[i].handle, i); 122 ret = -EINVAL; 123 goto out_unlock; 124 } 125 126 msm_obj = to_msm_bo(obj); 127 128 if (!list_empty(&msm_obj->submit_entry)) { 129 DRM_ERROR("handle %u at index %u already on submit list\n", 130 submit->bos[i].handle, i); 131 ret = -EINVAL; 132 goto out_unlock; 133 } 134 135 drm_gem_object_get(obj); 136 137 submit->bos[i].obj = msm_obj; 138 139 list_add_tail(&msm_obj->submit_entry, &submit->bo_list); 140 } 141 142 out_unlock: 143 spin_unlock(&file->table_lock); 144 145 out: 146 submit->nr_bos = i; 147 148 return ret; 149 } 150 151 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, 152 int i, bool backoff) 153 { 154 struct msm_gem_object *msm_obj = submit->bos[i].obj; 155 156 if (submit->bos[i].flags & BO_PINNED) 157 msm_gem_unpin_iova(&msm_obj->base, submit->aspace); 158 159 if (submit->bos[i].flags & BO_LOCKED) 160 dma_resv_unlock(msm_obj->base.resv); 161 162 if (backoff && !(submit->bos[i].flags & BO_VALID)) 163 submit->bos[i].iova = 0; 164 165 submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED); 166 } 167 168 /* This is where we make sure all the bo's are reserved and pin'd: */ 169 static int submit_lock_objects(struct msm_gem_submit *submit) 170 { 171 int contended, slow_locked = -1, i, ret = 0; 172 173 retry: 174 for (i = 0; i < submit->nr_bos; i++) { 175 struct msm_gem_object *msm_obj = submit->bos[i].obj; 176 177 if (slow_locked == i) 178 slow_locked = -1; 179 180 contended = i; 181 182 if (!(submit->bos[i].flags & BO_LOCKED)) { 183 ret = dma_resv_lock_interruptible(msm_obj->base.resv, 184 &submit->ticket); 185 if (ret) 186 goto fail; 187 submit->bos[i].flags |= BO_LOCKED; 188 } 189 } 190 191 ww_acquire_done(&submit->ticket); 192 193 return 0; 194 195 fail: 196 for (; i >= 0; i--) 197 submit_unlock_unpin_bo(submit, i, true); 198 199 if (slow_locked > 0) 200 submit_unlock_unpin_bo(submit, slow_locked, true); 201 202 if (ret == -EDEADLK) { 203 struct msm_gem_object *msm_obj = submit->bos[contended].obj; 204 /* we lost out in a seqno race, lock and retry.. */ 205 ret = dma_resv_lock_slow_interruptible(msm_obj->base.resv, 206 &submit->ticket); 207 if (!ret) { 208 submit->bos[contended].flags |= BO_LOCKED; 209 slow_locked = contended; 210 goto retry; 211 } 212 } 213 214 return ret; 215 } 216 217 static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit) 218 { 219 int i, ret = 0; 220 221 for (i = 0; i < submit->nr_bos; i++) { 222 struct msm_gem_object *msm_obj = submit->bos[i].obj; 223 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE; 224 225 if (!write) { 226 /* NOTE: _reserve_shared() must happen before 227 * _add_shared_fence(), which makes this a slightly 228 * strange place to call it. OTOH this is a 229 * convenient can-fail point to hook it in. 230 */ 231 ret = dma_resv_reserve_shared(msm_obj->base.resv, 232 1); 233 if (ret) 234 return ret; 235 } 236 237 if (no_implicit) 238 continue; 239 240 ret = msm_gem_sync_object(&msm_obj->base, submit->ring->fctx, 241 write); 242 if (ret) 243 break; 244 } 245 246 return ret; 247 } 248 249 static int submit_pin_objects(struct msm_gem_submit *submit) 250 { 251 int i, ret = 0; 252 253 submit->valid = true; 254 255 for (i = 0; i < submit->nr_bos; i++) { 256 struct msm_gem_object *msm_obj = submit->bos[i].obj; 257 uint64_t iova; 258 259 /* if locking succeeded, pin bo: */ 260 ret = msm_gem_get_and_pin_iova(&msm_obj->base, 261 submit->aspace, &iova); 262 263 if (ret) 264 break; 265 266 submit->bos[i].flags |= BO_PINNED; 267 268 if (iova == submit->bos[i].iova) { 269 submit->bos[i].flags |= BO_VALID; 270 } else { 271 submit->bos[i].iova = iova; 272 /* iova changed, so address in cmdstream is not valid: */ 273 submit->bos[i].flags &= ~BO_VALID; 274 submit->valid = false; 275 } 276 } 277 278 return ret; 279 } 280 281 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx, 282 struct msm_gem_object **obj, uint64_t *iova, bool *valid) 283 { 284 if (idx >= submit->nr_bos) { 285 DRM_ERROR("invalid buffer index: %u (out of %u)\n", 286 idx, submit->nr_bos); 287 return -EINVAL; 288 } 289 290 if (obj) 291 *obj = submit->bos[idx].obj; 292 if (iova) 293 *iova = submit->bos[idx].iova; 294 if (valid) 295 *valid = !!(submit->bos[idx].flags & BO_VALID); 296 297 return 0; 298 } 299 300 /* process the reloc's and patch up the cmdstream as needed: */ 301 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj, 302 uint32_t offset, uint32_t nr_relocs, uint64_t relocs) 303 { 304 uint32_t i, last_offset = 0; 305 uint32_t *ptr; 306 int ret = 0; 307 308 if (!nr_relocs) 309 return 0; 310 311 if (offset % 4) { 312 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset); 313 return -EINVAL; 314 } 315 316 /* For now, just map the entire thing. Eventually we probably 317 * to do it page-by-page, w/ kmap() if not vmap()d.. 318 */ 319 ptr = msm_gem_get_vaddr(&obj->base); 320 321 if (IS_ERR(ptr)) { 322 ret = PTR_ERR(ptr); 323 DBG("failed to map: %d", ret); 324 return ret; 325 } 326 327 for (i = 0; i < nr_relocs; i++) { 328 struct drm_msm_gem_submit_reloc submit_reloc; 329 void __user *userptr = 330 u64_to_user_ptr(relocs + (i * sizeof(submit_reloc))); 331 uint32_t off; 332 uint64_t iova; 333 bool valid; 334 335 if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) { 336 ret = -EFAULT; 337 goto out; 338 } 339 340 if (submit_reloc.submit_offset % 4) { 341 DRM_ERROR("non-aligned reloc offset: %u\n", 342 submit_reloc.submit_offset); 343 ret = -EINVAL; 344 goto out; 345 } 346 347 /* offset in dwords: */ 348 off = submit_reloc.submit_offset / 4; 349 350 if ((off >= (obj->base.size / 4)) || 351 (off < last_offset)) { 352 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 353 ret = -EINVAL; 354 goto out; 355 } 356 357 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid); 358 if (ret) 359 goto out; 360 361 if (valid) 362 continue; 363 364 iova += submit_reloc.reloc_offset; 365 366 if (submit_reloc.shift < 0) 367 iova >>= -submit_reloc.shift; 368 else 369 iova <<= submit_reloc.shift; 370 371 ptr[off] = iova | submit_reloc.or; 372 373 last_offset = off; 374 } 375 376 out: 377 msm_gem_put_vaddr(&obj->base); 378 379 return ret; 380 } 381 382 static void submit_cleanup(struct msm_gem_submit *submit) 383 { 384 unsigned i; 385 386 for (i = 0; i < submit->nr_bos; i++) { 387 struct msm_gem_object *msm_obj = submit->bos[i].obj; 388 submit_unlock_unpin_bo(submit, i, false); 389 list_del_init(&msm_obj->submit_entry); 390 drm_gem_object_put(&msm_obj->base); 391 } 392 } 393 394 int msm_ioctl_gem_submit(struct drm_device *dev, void *data, 395 struct drm_file *file) 396 { 397 static atomic_t ident = ATOMIC_INIT(0); 398 struct msm_drm_private *priv = dev->dev_private; 399 struct drm_msm_gem_submit *args = data; 400 struct msm_file_private *ctx = file->driver_priv; 401 struct msm_gem_submit *submit; 402 struct msm_gpu *gpu = priv->gpu; 403 struct sync_file *sync_file = NULL; 404 struct msm_gpu_submitqueue *queue; 405 struct msm_ringbuffer *ring; 406 int out_fence_fd = -1; 407 struct pid *pid = get_pid(task_pid(current)); 408 bool has_ww_ticket = false; 409 unsigned i; 410 int ret, submitid; 411 if (!gpu) 412 return -ENXIO; 413 414 /* for now, we just have 3d pipe.. eventually this would need to 415 * be more clever to dispatch to appropriate gpu module: 416 */ 417 if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0) 418 return -EINVAL; 419 420 if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS) 421 return -EINVAL; 422 423 if (args->flags & MSM_SUBMIT_SUDO) { 424 if (!IS_ENABLED(CONFIG_DRM_MSM_GPU_SUDO) || 425 !capable(CAP_SYS_RAWIO)) 426 return -EINVAL; 427 } 428 429 queue = msm_submitqueue_get(ctx, args->queueid); 430 if (!queue) 431 return -ENOENT; 432 433 /* Get a unique identifier for the submission for logging purposes */ 434 submitid = atomic_inc_return(&ident) - 1; 435 436 ring = gpu->rb[queue->prio]; 437 trace_msm_gpu_submit(pid_nr(pid), ring->id, submitid, 438 args->nr_bos, args->nr_cmds); 439 440 if (args->flags & MSM_SUBMIT_FENCE_FD_IN) { 441 struct dma_fence *in_fence; 442 443 in_fence = sync_file_get_fence(args->fence_fd); 444 445 if (!in_fence) 446 return -EINVAL; 447 448 /* 449 * Wait if the fence is from a foreign context, or if the fence 450 * array contains any fence from a foreign context. 451 */ 452 ret = 0; 453 if (!dma_fence_match_context(in_fence, ring->fctx->context)) 454 ret = dma_fence_wait(in_fence, true); 455 456 dma_fence_put(in_fence); 457 if (ret) 458 return ret; 459 } 460 461 ret = mutex_lock_interruptible(&dev->struct_mutex); 462 if (ret) 463 return ret; 464 465 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 466 out_fence_fd = get_unused_fd_flags(O_CLOEXEC); 467 if (out_fence_fd < 0) { 468 ret = out_fence_fd; 469 goto out_unlock; 470 } 471 } 472 473 submit = submit_create(dev, gpu, ctx->aspace, queue, args->nr_bos, 474 args->nr_cmds); 475 if (!submit) { 476 ret = -ENOMEM; 477 goto out_unlock; 478 } 479 480 submit->pid = pid; 481 submit->ident = submitid; 482 483 if (args->flags & MSM_SUBMIT_SUDO) 484 submit->in_rb = true; 485 486 ret = submit_lookup_objects(submit, args, file); 487 if (ret) 488 goto out; 489 490 /* copy_*_user while holding a ww ticket upsets lockdep */ 491 ww_acquire_init(&submit->ticket, &reservation_ww_class); 492 has_ww_ticket = true; 493 ret = submit_lock_objects(submit); 494 if (ret) 495 goto out; 496 497 ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT)); 498 if (ret) 499 goto out; 500 501 ret = submit_pin_objects(submit); 502 if (ret) 503 goto out; 504 505 for (i = 0; i < args->nr_cmds; i++) { 506 struct drm_msm_gem_submit_cmd submit_cmd; 507 void __user *userptr = 508 u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd))); 509 struct msm_gem_object *msm_obj; 510 uint64_t iova; 511 512 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd)); 513 if (ret) { 514 ret = -EFAULT; 515 goto out; 516 } 517 518 /* validate input from userspace: */ 519 switch (submit_cmd.type) { 520 case MSM_SUBMIT_CMD_BUF: 521 case MSM_SUBMIT_CMD_IB_TARGET_BUF: 522 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF: 523 break; 524 default: 525 DRM_ERROR("invalid type: %08x\n", submit_cmd.type); 526 ret = -EINVAL; 527 goto out; 528 } 529 530 ret = submit_bo(submit, submit_cmd.submit_idx, 531 &msm_obj, &iova, NULL); 532 if (ret) 533 goto out; 534 535 if (submit_cmd.size % 4) { 536 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 537 submit_cmd.size); 538 ret = -EINVAL; 539 goto out; 540 } 541 542 if (!submit_cmd.size || 543 ((submit_cmd.size + submit_cmd.submit_offset) > 544 msm_obj->base.size)) { 545 DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size); 546 ret = -EINVAL; 547 goto out; 548 } 549 550 submit->cmd[i].type = submit_cmd.type; 551 submit->cmd[i].size = submit_cmd.size / 4; 552 submit->cmd[i].iova = iova + submit_cmd.submit_offset; 553 submit->cmd[i].idx = submit_cmd.submit_idx; 554 555 if (submit->valid) 556 continue; 557 558 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset, 559 submit_cmd.nr_relocs, submit_cmd.relocs); 560 if (ret) 561 goto out; 562 } 563 564 submit->nr_cmds = i; 565 566 submit->fence = msm_fence_alloc(ring->fctx); 567 if (IS_ERR(submit->fence)) { 568 ret = PTR_ERR(submit->fence); 569 submit->fence = NULL; 570 goto out; 571 } 572 573 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 574 sync_file = sync_file_create(submit->fence); 575 if (!sync_file) { 576 ret = -ENOMEM; 577 goto out; 578 } 579 } 580 581 msm_gpu_submit(gpu, submit, ctx); 582 583 args->fence = submit->fence->seqno; 584 585 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 586 fd_install(out_fence_fd, sync_file->file); 587 args->fence_fd = out_fence_fd; 588 } 589 590 out: 591 submit_cleanup(submit); 592 if (has_ww_ticket) 593 ww_acquire_fini(&submit->ticket); 594 if (ret) 595 msm_gem_submit_free(submit); 596 out_unlock: 597 if (ret && (out_fence_fd >= 0)) 598 put_unused_fd(out_fence_fd); 599 mutex_unlock(&dev->struct_mutex); 600 return ret; 601 } 602