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) + ((u64)nr_bos * sizeof(submit->bos[0])) + 38 ((u64)nr_cmds * sizeof(submit->cmd[0])); 39 40 if (sz > SIZE_MAX) 41 return NULL; 42 43 submit = kmalloc(sz, GFP_KERNEL | __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, bool no_implicit) 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 if (!write) { 233 /* NOTE: _reserve_shared() must happen before 234 * _add_shared_fence(), which makes this a slightly 235 * strange place to call it. OTOH this is a 236 * convenient can-fail point to hook it in. 237 */ 238 ret = reservation_object_reserve_shared(msm_obj->resv); 239 if (ret) 240 return ret; 241 } 242 243 if (no_implicit) 244 continue; 245 246 ret = msm_gem_sync_object(&msm_obj->base, submit->gpu->fctx, write); 247 if (ret) 248 break; 249 } 250 251 return ret; 252 } 253 254 static int submit_pin_objects(struct msm_gem_submit *submit) 255 { 256 int i, ret = 0; 257 258 submit->valid = true; 259 260 for (i = 0; i < submit->nr_bos; i++) { 261 struct msm_gem_object *msm_obj = submit->bos[i].obj; 262 uint64_t iova; 263 264 /* if locking succeeded, pin bo: */ 265 ret = msm_gem_get_iova(&msm_obj->base, 266 submit->gpu->aspace, &iova); 267 268 if (ret) 269 break; 270 271 submit->bos[i].flags |= BO_PINNED; 272 273 if (iova == submit->bos[i].iova) { 274 submit->bos[i].flags |= BO_VALID; 275 } else { 276 submit->bos[i].iova = iova; 277 /* iova changed, so address in cmdstream is not valid: */ 278 submit->bos[i].flags &= ~BO_VALID; 279 submit->valid = false; 280 } 281 } 282 283 return ret; 284 } 285 286 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx, 287 struct msm_gem_object **obj, uint64_t *iova, bool *valid) 288 { 289 if (idx >= submit->nr_bos) { 290 DRM_ERROR("invalid buffer index: %u (out of %u)\n", 291 idx, submit->nr_bos); 292 return -EINVAL; 293 } 294 295 if (obj) 296 *obj = submit->bos[idx].obj; 297 if (iova) 298 *iova = submit->bos[idx].iova; 299 if (valid) 300 *valid = !!(submit->bos[idx].flags & BO_VALID); 301 302 return 0; 303 } 304 305 /* process the reloc's and patch up the cmdstream as needed: */ 306 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj, 307 uint32_t offset, uint32_t nr_relocs, uint64_t relocs) 308 { 309 uint32_t i, last_offset = 0; 310 uint32_t *ptr; 311 int ret = 0; 312 313 if (offset % 4) { 314 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset); 315 return -EINVAL; 316 } 317 318 /* For now, just map the entire thing. Eventually we probably 319 * to do it page-by-page, w/ kmap() if not vmap()d.. 320 */ 321 ptr = msm_gem_get_vaddr(&obj->base); 322 323 if (IS_ERR(ptr)) { 324 ret = PTR_ERR(ptr); 325 DBG("failed to map: %d", ret); 326 return ret; 327 } 328 329 for (i = 0; i < nr_relocs; i++) { 330 struct drm_msm_gem_submit_reloc submit_reloc; 331 void __user *userptr = 332 u64_to_user_ptr(relocs + (i * sizeof(submit_reloc))); 333 uint32_t off; 334 uint64_t iova; 335 bool valid; 336 337 if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) { 338 ret = -EFAULT; 339 goto out; 340 } 341 342 if (submit_reloc.submit_offset % 4) { 343 DRM_ERROR("non-aligned reloc offset: %u\n", 344 submit_reloc.submit_offset); 345 ret = -EINVAL; 346 goto out; 347 } 348 349 /* offset in dwords: */ 350 off = submit_reloc.submit_offset / 4; 351 352 if ((off >= (obj->base.size / 4)) || 353 (off < last_offset)) { 354 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 355 ret = -EINVAL; 356 goto out; 357 } 358 359 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid); 360 if (ret) 361 goto out; 362 363 if (valid) 364 continue; 365 366 iova += submit_reloc.reloc_offset; 367 368 if (submit_reloc.shift < 0) 369 iova >>= -submit_reloc.shift; 370 else 371 iova <<= submit_reloc.shift; 372 373 ptr[off] = iova | submit_reloc.or; 374 375 last_offset = off; 376 } 377 378 out: 379 msm_gem_put_vaddr(&obj->base); 380 381 return ret; 382 } 383 384 static void submit_cleanup(struct msm_gem_submit *submit) 385 { 386 unsigned i; 387 388 for (i = 0; i < submit->nr_bos; i++) { 389 struct msm_gem_object *msm_obj = submit->bos[i].obj; 390 submit_unlock_unpin_bo(submit, i); 391 list_del_init(&msm_obj->submit_entry); 392 drm_gem_object_unreference(&msm_obj->base); 393 } 394 395 ww_acquire_fini(&submit->ticket); 396 } 397 398 int msm_ioctl_gem_submit(struct drm_device *dev, void *data, 399 struct drm_file *file) 400 { 401 struct msm_drm_private *priv = dev->dev_private; 402 struct drm_msm_gem_submit *args = data; 403 struct msm_file_private *ctx = file->driver_priv; 404 struct msm_gem_submit *submit; 405 struct msm_gpu *gpu = priv->gpu; 406 struct dma_fence *in_fence = NULL; 407 struct sync_file *sync_file = NULL; 408 int out_fence_fd = -1; 409 unsigned i; 410 int ret; 411 412 if (!gpu) 413 return -ENXIO; 414 415 /* for now, we just have 3d pipe.. eventually this would need to 416 * be more clever to dispatch to appropriate gpu module: 417 */ 418 if (MSM_PIPE_ID(args->flags) != MSM_PIPE_3D0) 419 return -EINVAL; 420 421 if (MSM_PIPE_FLAGS(args->flags) & ~MSM_SUBMIT_FLAGS) 422 return -EINVAL; 423 424 if (args->flags & MSM_SUBMIT_FENCE_FD_IN) { 425 in_fence = sync_file_get_fence(args->fence_fd); 426 427 if (!in_fence) 428 return -EINVAL; 429 430 /* 431 * Wait if the fence is from a foreign context, or if the fence 432 * array contains any fence from a foreign context. 433 */ 434 if (!dma_fence_match_context(in_fence, gpu->fctx->context)) { 435 ret = dma_fence_wait(in_fence, true); 436 if (ret) 437 return ret; 438 } 439 } 440 441 ret = mutex_lock_interruptible(&dev->struct_mutex); 442 if (ret) 443 return ret; 444 445 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 446 out_fence_fd = get_unused_fd_flags(O_CLOEXEC); 447 if (out_fence_fd < 0) { 448 ret = out_fence_fd; 449 goto out_unlock; 450 } 451 } 452 priv->struct_mutex_task = current; 453 454 submit = submit_create(dev, gpu, args->nr_bos, args->nr_cmds); 455 if (!submit) { 456 ret = -ENOMEM; 457 goto out_unlock; 458 } 459 460 ret = submit_lookup_objects(submit, args, file); 461 if (ret) 462 goto out; 463 464 ret = submit_lock_objects(submit); 465 if (ret) 466 goto out; 467 468 ret = submit_fence_sync(submit, !!(args->flags & MSM_SUBMIT_NO_IMPLICIT)); 469 if (ret) 470 goto out; 471 472 ret = submit_pin_objects(submit); 473 if (ret) 474 goto out; 475 476 for (i = 0; i < args->nr_cmds; i++) { 477 struct drm_msm_gem_submit_cmd submit_cmd; 478 void __user *userptr = 479 u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd))); 480 struct msm_gem_object *msm_obj; 481 uint64_t iova; 482 483 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd)); 484 if (ret) { 485 ret = -EFAULT; 486 goto out; 487 } 488 489 /* validate input from userspace: */ 490 switch (submit_cmd.type) { 491 case MSM_SUBMIT_CMD_BUF: 492 case MSM_SUBMIT_CMD_IB_TARGET_BUF: 493 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF: 494 break; 495 default: 496 DRM_ERROR("invalid type: %08x\n", submit_cmd.type); 497 ret = -EINVAL; 498 goto out; 499 } 500 501 ret = submit_bo(submit, submit_cmd.submit_idx, 502 &msm_obj, &iova, NULL); 503 if (ret) 504 goto out; 505 506 if (submit_cmd.size % 4) { 507 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 508 submit_cmd.size); 509 ret = -EINVAL; 510 goto out; 511 } 512 513 if (!submit_cmd.size || 514 ((submit_cmd.size + submit_cmd.submit_offset) > 515 msm_obj->base.size)) { 516 DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size); 517 ret = -EINVAL; 518 goto out; 519 } 520 521 submit->cmd[i].type = submit_cmd.type; 522 submit->cmd[i].size = submit_cmd.size / 4; 523 submit->cmd[i].iova = iova + submit_cmd.submit_offset; 524 submit->cmd[i].idx = submit_cmd.submit_idx; 525 526 if (submit->valid) 527 continue; 528 529 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset, 530 submit_cmd.nr_relocs, submit_cmd.relocs); 531 if (ret) 532 goto out; 533 } 534 535 submit->nr_cmds = i; 536 537 submit->fence = msm_fence_alloc(gpu->fctx); 538 if (IS_ERR(submit->fence)) { 539 ret = PTR_ERR(submit->fence); 540 submit->fence = NULL; 541 goto out; 542 } 543 544 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 545 sync_file = sync_file_create(submit->fence); 546 if (!sync_file) { 547 ret = -ENOMEM; 548 goto out; 549 } 550 } 551 552 msm_gpu_submit(gpu, submit, ctx); 553 554 args->fence = submit->fence->seqno; 555 556 if (args->flags & MSM_SUBMIT_FENCE_FD_OUT) { 557 fd_install(out_fence_fd, sync_file->file); 558 args->fence_fd = out_fence_fd; 559 } 560 561 out: 562 if (in_fence) 563 dma_fence_put(in_fence); 564 submit_cleanup(submit); 565 if (ret) 566 msm_gem_submit_free(submit); 567 out_unlock: 568 if (ret && (out_fence_fd >= 0)) 569 put_unused_fd(out_fence_fd); 570 priv->struct_mutex_task = NULL; 571 mutex_unlock(&dev->struct_mutex); 572 return ret; 573 } 574