1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /* 3 * Copyright 2020-2021 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 24 #include <linux/types.h> 25 #include <linux/sched/task.h> 26 #include "amdgpu_sync.h" 27 #include "amdgpu_object.h" 28 #include "amdgpu_vm.h" 29 #include "amdgpu_mn.h" 30 #include "amdgpu.h" 31 #include "amdgpu_xgmi.h" 32 #include "kfd_priv.h" 33 #include "kfd_svm.h" 34 #include "kfd_migrate.h" 35 #include "kfd_smi_events.h" 36 37 #ifdef dev_fmt 38 #undef dev_fmt 39 #endif 40 #define dev_fmt(fmt) "kfd_svm: %s: " fmt, __func__ 41 42 #define AMDGPU_SVM_RANGE_RESTORE_DELAY_MS 1 43 44 /* Long enough to ensure no retry fault comes after svm range is restored and 45 * page table is updated. 46 */ 47 #define AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING (2UL * NSEC_PER_MSEC) 48 49 /* Giant svm range split into smaller ranges based on this, it is decided using 50 * minimum of all dGPU/APU 1/32 VRAM size, between 2MB to 1GB and alignment to 51 * power of 2MB. 52 */ 53 static uint64_t max_svm_range_pages; 54 55 struct criu_svm_metadata { 56 struct list_head list; 57 struct kfd_criu_svm_range_priv_data data; 58 }; 59 60 static void svm_range_evict_svm_bo_worker(struct work_struct *work); 61 static bool 62 svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, 63 const struct mmu_notifier_range *range, 64 unsigned long cur_seq); 65 static int 66 svm_range_check_vm(struct kfd_process *p, uint64_t start, uint64_t last, 67 uint64_t *bo_s, uint64_t *bo_l); 68 static const struct mmu_interval_notifier_ops svm_range_mn_ops = { 69 .invalidate = svm_range_cpu_invalidate_pagetables, 70 }; 71 72 /** 73 * svm_range_unlink - unlink svm_range from lists and interval tree 74 * @prange: svm range structure to be removed 75 * 76 * Remove the svm_range from the svms and svm_bo lists and the svms 77 * interval tree. 78 * 79 * Context: The caller must hold svms->lock 80 */ 81 static void svm_range_unlink(struct svm_range *prange) 82 { 83 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 84 prange, prange->start, prange->last); 85 86 if (prange->svm_bo) { 87 spin_lock(&prange->svm_bo->list_lock); 88 list_del(&prange->svm_bo_list); 89 spin_unlock(&prange->svm_bo->list_lock); 90 } 91 92 list_del(&prange->list); 93 if (prange->it_node.start != 0 && prange->it_node.last != 0) 94 interval_tree_remove(&prange->it_node, &prange->svms->objects); 95 } 96 97 static void 98 svm_range_add_notifier_locked(struct mm_struct *mm, struct svm_range *prange) 99 { 100 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 101 prange, prange->start, prange->last); 102 103 mmu_interval_notifier_insert_locked(&prange->notifier, mm, 104 prange->start << PAGE_SHIFT, 105 prange->npages << PAGE_SHIFT, 106 &svm_range_mn_ops); 107 } 108 109 /** 110 * svm_range_add_to_svms - add svm range to svms 111 * @prange: svm range structure to be added 112 * 113 * Add the svm range to svms interval tree and link list 114 * 115 * Context: The caller must hold svms->lock 116 */ 117 static void svm_range_add_to_svms(struct svm_range *prange) 118 { 119 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 120 prange, prange->start, prange->last); 121 122 list_move_tail(&prange->list, &prange->svms->list); 123 prange->it_node.start = prange->start; 124 prange->it_node.last = prange->last; 125 interval_tree_insert(&prange->it_node, &prange->svms->objects); 126 } 127 128 static void svm_range_remove_notifier(struct svm_range *prange) 129 { 130 pr_debug("remove notifier svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", 131 prange->svms, prange, 132 prange->notifier.interval_tree.start >> PAGE_SHIFT, 133 prange->notifier.interval_tree.last >> PAGE_SHIFT); 134 135 if (prange->notifier.interval_tree.start != 0 && 136 prange->notifier.interval_tree.last != 0) 137 mmu_interval_notifier_remove(&prange->notifier); 138 } 139 140 static bool 141 svm_is_valid_dma_mapping_addr(struct device *dev, dma_addr_t dma_addr) 142 { 143 return dma_addr && !dma_mapping_error(dev, dma_addr) && 144 !(dma_addr & SVM_RANGE_VRAM_DOMAIN); 145 } 146 147 static int 148 svm_range_dma_map_dev(struct amdgpu_device *adev, struct svm_range *prange, 149 unsigned long offset, unsigned long npages, 150 unsigned long *hmm_pfns, uint32_t gpuidx) 151 { 152 enum dma_data_direction dir = DMA_BIDIRECTIONAL; 153 dma_addr_t *addr = prange->dma_addr[gpuidx]; 154 struct device *dev = adev->dev; 155 struct page *page; 156 int i, r; 157 158 if (!addr) { 159 addr = kvcalloc(prange->npages, sizeof(*addr), GFP_KERNEL); 160 if (!addr) 161 return -ENOMEM; 162 prange->dma_addr[gpuidx] = addr; 163 } 164 165 addr += offset; 166 for (i = 0; i < npages; i++) { 167 if (svm_is_valid_dma_mapping_addr(dev, addr[i])) 168 dma_unmap_page(dev, addr[i], PAGE_SIZE, dir); 169 170 page = hmm_pfn_to_page(hmm_pfns[i]); 171 if (is_zone_device_page(page)) { 172 struct amdgpu_device *bo_adev = 173 amdgpu_ttm_adev(prange->svm_bo->bo->tbo.bdev); 174 175 addr[i] = (hmm_pfns[i] << PAGE_SHIFT) + 176 bo_adev->vm_manager.vram_base_offset - 177 bo_adev->kfd.dev->pgmap.range.start; 178 addr[i] |= SVM_RANGE_VRAM_DOMAIN; 179 pr_debug_ratelimited("vram address: 0x%llx\n", addr[i]); 180 continue; 181 } 182 addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir); 183 r = dma_mapping_error(dev, addr[i]); 184 if (r) { 185 dev_err(dev, "failed %d dma_map_page\n", r); 186 return r; 187 } 188 pr_debug_ratelimited("dma mapping 0x%llx for page addr 0x%lx\n", 189 addr[i] >> PAGE_SHIFT, page_to_pfn(page)); 190 } 191 return 0; 192 } 193 194 static int 195 svm_range_dma_map(struct svm_range *prange, unsigned long *bitmap, 196 unsigned long offset, unsigned long npages, 197 unsigned long *hmm_pfns) 198 { 199 struct kfd_process *p; 200 uint32_t gpuidx; 201 int r; 202 203 p = container_of(prange->svms, struct kfd_process, svms); 204 205 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 206 struct kfd_process_device *pdd; 207 208 pr_debug("mapping to gpu idx 0x%x\n", gpuidx); 209 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 210 if (!pdd) { 211 pr_debug("failed to find device idx %d\n", gpuidx); 212 return -EINVAL; 213 } 214 215 r = svm_range_dma_map_dev(pdd->dev->adev, prange, offset, npages, 216 hmm_pfns, gpuidx); 217 if (r) 218 break; 219 } 220 221 return r; 222 } 223 224 void svm_range_dma_unmap(struct device *dev, dma_addr_t *dma_addr, 225 unsigned long offset, unsigned long npages) 226 { 227 enum dma_data_direction dir = DMA_BIDIRECTIONAL; 228 int i; 229 230 if (!dma_addr) 231 return; 232 233 for (i = offset; i < offset + npages; i++) { 234 if (!svm_is_valid_dma_mapping_addr(dev, dma_addr[i])) 235 continue; 236 pr_debug_ratelimited("unmap 0x%llx\n", dma_addr[i] >> PAGE_SHIFT); 237 dma_unmap_page(dev, dma_addr[i], PAGE_SIZE, dir); 238 dma_addr[i] = 0; 239 } 240 } 241 242 void svm_range_free_dma_mappings(struct svm_range *prange) 243 { 244 struct kfd_process_device *pdd; 245 dma_addr_t *dma_addr; 246 struct device *dev; 247 struct kfd_process *p; 248 uint32_t gpuidx; 249 250 p = container_of(prange->svms, struct kfd_process, svms); 251 252 for (gpuidx = 0; gpuidx < MAX_GPU_INSTANCE; gpuidx++) { 253 dma_addr = prange->dma_addr[gpuidx]; 254 if (!dma_addr) 255 continue; 256 257 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 258 if (!pdd) { 259 pr_debug("failed to find device idx %d\n", gpuidx); 260 continue; 261 } 262 dev = &pdd->dev->pdev->dev; 263 svm_range_dma_unmap(dev, dma_addr, 0, prange->npages); 264 kvfree(dma_addr); 265 prange->dma_addr[gpuidx] = NULL; 266 } 267 } 268 269 static void svm_range_free(struct svm_range *prange, bool update_mem_usage) 270 { 271 uint64_t size = (prange->last - prange->start + 1) << PAGE_SHIFT; 272 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); 273 274 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, prange, 275 prange->start, prange->last); 276 277 svm_range_vram_node_free(prange); 278 svm_range_free_dma_mappings(prange); 279 280 if (update_mem_usage && !p->xnack_enabled) { 281 pr_debug("unreserve prange 0x%p size: 0x%llx\n", prange, size); 282 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 283 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 284 } 285 mutex_destroy(&prange->lock); 286 mutex_destroy(&prange->migrate_mutex); 287 kfree(prange); 288 } 289 290 static void 291 svm_range_set_default_attributes(int32_t *location, int32_t *prefetch_loc, 292 uint8_t *granularity, uint32_t *flags) 293 { 294 *location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 295 *prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 296 *granularity = 9; 297 *flags = 298 KFD_IOCTL_SVM_FLAG_HOST_ACCESS | KFD_IOCTL_SVM_FLAG_COHERENT; 299 } 300 301 static struct 302 svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start, 303 uint64_t last, bool update_mem_usage) 304 { 305 uint64_t size = last - start + 1; 306 struct svm_range *prange; 307 struct kfd_process *p; 308 309 prange = kzalloc(sizeof(*prange), GFP_KERNEL); 310 if (!prange) 311 return NULL; 312 313 p = container_of(svms, struct kfd_process, svms); 314 if (!p->xnack_enabled && update_mem_usage && 315 amdgpu_amdkfd_reserve_mem_limit(NULL, size << PAGE_SHIFT, 316 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR)) { 317 pr_info("SVM mapping failed, exceeds resident system memory limit\n"); 318 kfree(prange); 319 return NULL; 320 } 321 prange->npages = size; 322 prange->svms = svms; 323 prange->start = start; 324 prange->last = last; 325 INIT_LIST_HEAD(&prange->list); 326 INIT_LIST_HEAD(&prange->update_list); 327 INIT_LIST_HEAD(&prange->svm_bo_list); 328 INIT_LIST_HEAD(&prange->deferred_list); 329 INIT_LIST_HEAD(&prange->child_list); 330 atomic_set(&prange->invalid, 0); 331 prange->validate_timestamp = 0; 332 mutex_init(&prange->migrate_mutex); 333 mutex_init(&prange->lock); 334 335 if (p->xnack_enabled) 336 bitmap_copy(prange->bitmap_access, svms->bitmap_supported, 337 MAX_GPU_INSTANCE); 338 339 svm_range_set_default_attributes(&prange->preferred_loc, 340 &prange->prefetch_loc, 341 &prange->granularity, &prange->flags); 342 343 pr_debug("svms 0x%p [0x%llx 0x%llx]\n", svms, start, last); 344 345 return prange; 346 } 347 348 static bool svm_bo_ref_unless_zero(struct svm_range_bo *svm_bo) 349 { 350 if (!svm_bo || !kref_get_unless_zero(&svm_bo->kref)) 351 return false; 352 353 return true; 354 } 355 356 static void svm_range_bo_release(struct kref *kref) 357 { 358 struct svm_range_bo *svm_bo; 359 360 svm_bo = container_of(kref, struct svm_range_bo, kref); 361 pr_debug("svm_bo 0x%p\n", svm_bo); 362 363 spin_lock(&svm_bo->list_lock); 364 while (!list_empty(&svm_bo->range_list)) { 365 struct svm_range *prange = 366 list_first_entry(&svm_bo->range_list, 367 struct svm_range, svm_bo_list); 368 /* list_del_init tells a concurrent svm_range_vram_node_new when 369 * it's safe to reuse the svm_bo pointer and svm_bo_list head. 370 */ 371 list_del_init(&prange->svm_bo_list); 372 spin_unlock(&svm_bo->list_lock); 373 374 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, 375 prange->start, prange->last); 376 mutex_lock(&prange->lock); 377 prange->svm_bo = NULL; 378 mutex_unlock(&prange->lock); 379 380 spin_lock(&svm_bo->list_lock); 381 } 382 spin_unlock(&svm_bo->list_lock); 383 if (!dma_fence_is_signaled(&svm_bo->eviction_fence->base)) { 384 /* We're not in the eviction worker. 385 * Signal the fence and synchronize with any 386 * pending eviction work. 387 */ 388 dma_fence_signal(&svm_bo->eviction_fence->base); 389 cancel_work_sync(&svm_bo->eviction_work); 390 } 391 dma_fence_put(&svm_bo->eviction_fence->base); 392 amdgpu_bo_unref(&svm_bo->bo); 393 kfree(svm_bo); 394 } 395 396 static void svm_range_bo_wq_release(struct work_struct *work) 397 { 398 struct svm_range_bo *svm_bo; 399 400 svm_bo = container_of(work, struct svm_range_bo, release_work); 401 svm_range_bo_release(&svm_bo->kref); 402 } 403 404 static void svm_range_bo_release_async(struct kref *kref) 405 { 406 struct svm_range_bo *svm_bo; 407 408 svm_bo = container_of(kref, struct svm_range_bo, kref); 409 pr_debug("svm_bo 0x%p\n", svm_bo); 410 INIT_WORK(&svm_bo->release_work, svm_range_bo_wq_release); 411 schedule_work(&svm_bo->release_work); 412 } 413 414 void svm_range_bo_unref_async(struct svm_range_bo *svm_bo) 415 { 416 kref_put(&svm_bo->kref, svm_range_bo_release_async); 417 } 418 419 static void svm_range_bo_unref(struct svm_range_bo *svm_bo) 420 { 421 if (svm_bo) 422 kref_put(&svm_bo->kref, svm_range_bo_release); 423 } 424 425 static bool 426 svm_range_validate_svm_bo(struct amdgpu_device *adev, struct svm_range *prange) 427 { 428 struct amdgpu_device *bo_adev; 429 430 mutex_lock(&prange->lock); 431 if (!prange->svm_bo) { 432 mutex_unlock(&prange->lock); 433 return false; 434 } 435 if (prange->ttm_res) { 436 /* We still have a reference, all is well */ 437 mutex_unlock(&prange->lock); 438 return true; 439 } 440 if (svm_bo_ref_unless_zero(prange->svm_bo)) { 441 /* 442 * Migrate from GPU to GPU, remove range from source bo_adev 443 * svm_bo range list, and return false to allocate svm_bo from 444 * destination adev. 445 */ 446 bo_adev = amdgpu_ttm_adev(prange->svm_bo->bo->tbo.bdev); 447 if (bo_adev != adev) { 448 mutex_unlock(&prange->lock); 449 450 spin_lock(&prange->svm_bo->list_lock); 451 list_del_init(&prange->svm_bo_list); 452 spin_unlock(&prange->svm_bo->list_lock); 453 454 svm_range_bo_unref(prange->svm_bo); 455 return false; 456 } 457 if (READ_ONCE(prange->svm_bo->evicting)) { 458 struct dma_fence *f; 459 struct svm_range_bo *svm_bo; 460 /* The BO is getting evicted, 461 * we need to get a new one 462 */ 463 mutex_unlock(&prange->lock); 464 svm_bo = prange->svm_bo; 465 f = dma_fence_get(&svm_bo->eviction_fence->base); 466 svm_range_bo_unref(prange->svm_bo); 467 /* wait for the fence to avoid long spin-loop 468 * at list_empty_careful 469 */ 470 dma_fence_wait(f, false); 471 dma_fence_put(f); 472 } else { 473 /* The BO was still around and we got 474 * a new reference to it 475 */ 476 mutex_unlock(&prange->lock); 477 pr_debug("reuse old bo svms 0x%p [0x%lx 0x%lx]\n", 478 prange->svms, prange->start, prange->last); 479 480 prange->ttm_res = prange->svm_bo->bo->tbo.resource; 481 return true; 482 } 483 484 } else { 485 mutex_unlock(&prange->lock); 486 } 487 488 /* We need a new svm_bo. Spin-loop to wait for concurrent 489 * svm_range_bo_release to finish removing this range from 490 * its range list. After this, it is safe to reuse the 491 * svm_bo pointer and svm_bo_list head. 492 */ 493 while (!list_empty_careful(&prange->svm_bo_list)) 494 ; 495 496 return false; 497 } 498 499 static struct svm_range_bo *svm_range_bo_new(void) 500 { 501 struct svm_range_bo *svm_bo; 502 503 svm_bo = kzalloc(sizeof(*svm_bo), GFP_KERNEL); 504 if (!svm_bo) 505 return NULL; 506 507 kref_init(&svm_bo->kref); 508 INIT_LIST_HEAD(&svm_bo->range_list); 509 spin_lock_init(&svm_bo->list_lock); 510 511 return svm_bo; 512 } 513 514 int 515 svm_range_vram_node_new(struct amdgpu_device *adev, struct svm_range *prange, 516 bool clear) 517 { 518 struct amdgpu_bo_param bp; 519 struct svm_range_bo *svm_bo; 520 struct amdgpu_bo_user *ubo; 521 struct amdgpu_bo *bo; 522 struct kfd_process *p; 523 struct mm_struct *mm; 524 int r; 525 526 p = container_of(prange->svms, struct kfd_process, svms); 527 pr_debug("pasid: %x svms 0x%p [0x%lx 0x%lx]\n", p->pasid, prange->svms, 528 prange->start, prange->last); 529 530 if (svm_range_validate_svm_bo(adev, prange)) 531 return 0; 532 533 svm_bo = svm_range_bo_new(); 534 if (!svm_bo) { 535 pr_debug("failed to alloc svm bo\n"); 536 return -ENOMEM; 537 } 538 mm = get_task_mm(p->lead_thread); 539 if (!mm) { 540 pr_debug("failed to get mm\n"); 541 kfree(svm_bo); 542 return -ESRCH; 543 } 544 svm_bo->eviction_fence = 545 amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1), 546 mm, 547 svm_bo); 548 mmput(mm); 549 INIT_WORK(&svm_bo->eviction_work, svm_range_evict_svm_bo_worker); 550 svm_bo->evicting = 0; 551 memset(&bp, 0, sizeof(bp)); 552 bp.size = prange->npages * PAGE_SIZE; 553 bp.byte_align = PAGE_SIZE; 554 bp.domain = AMDGPU_GEM_DOMAIN_VRAM; 555 bp.flags = AMDGPU_GEM_CREATE_NO_CPU_ACCESS; 556 bp.flags |= clear ? AMDGPU_GEM_CREATE_VRAM_CLEARED : 0; 557 bp.flags |= AMDGPU_GEM_CREATE_DISCARDABLE; 558 bp.type = ttm_bo_type_device; 559 bp.resv = NULL; 560 561 r = amdgpu_bo_create_user(adev, &bp, &ubo); 562 if (r) { 563 pr_debug("failed %d to create bo\n", r); 564 goto create_bo_failed; 565 } 566 bo = &ubo->bo; 567 r = amdgpu_bo_reserve(bo, true); 568 if (r) { 569 pr_debug("failed %d to reserve bo\n", r); 570 goto reserve_bo_failed; 571 } 572 573 r = dma_resv_reserve_fences(bo->tbo.base.resv, 1); 574 if (r) { 575 pr_debug("failed %d to reserve bo\n", r); 576 amdgpu_bo_unreserve(bo); 577 goto reserve_bo_failed; 578 } 579 amdgpu_bo_fence(bo, &svm_bo->eviction_fence->base, true); 580 581 amdgpu_bo_unreserve(bo); 582 583 svm_bo->bo = bo; 584 prange->svm_bo = svm_bo; 585 prange->ttm_res = bo->tbo.resource; 586 prange->offset = 0; 587 588 spin_lock(&svm_bo->list_lock); 589 list_add(&prange->svm_bo_list, &svm_bo->range_list); 590 spin_unlock(&svm_bo->list_lock); 591 592 return 0; 593 594 reserve_bo_failed: 595 amdgpu_bo_unref(&bo); 596 create_bo_failed: 597 dma_fence_put(&svm_bo->eviction_fence->base); 598 kfree(svm_bo); 599 prange->ttm_res = NULL; 600 601 return r; 602 } 603 604 void svm_range_vram_node_free(struct svm_range *prange) 605 { 606 svm_range_bo_unref(prange->svm_bo); 607 prange->ttm_res = NULL; 608 } 609 610 struct amdgpu_device * 611 svm_range_get_adev_by_id(struct svm_range *prange, uint32_t gpu_id) 612 { 613 struct kfd_process_device *pdd; 614 struct kfd_process *p; 615 int32_t gpu_idx; 616 617 p = container_of(prange->svms, struct kfd_process, svms); 618 619 gpu_idx = kfd_process_gpuidx_from_gpuid(p, gpu_id); 620 if (gpu_idx < 0) { 621 pr_debug("failed to get device by id 0x%x\n", gpu_id); 622 return NULL; 623 } 624 pdd = kfd_process_device_from_gpuidx(p, gpu_idx); 625 if (!pdd) { 626 pr_debug("failed to get device by idx 0x%x\n", gpu_idx); 627 return NULL; 628 } 629 630 return pdd->dev->adev; 631 } 632 633 struct kfd_process_device * 634 svm_range_get_pdd_by_adev(struct svm_range *prange, struct amdgpu_device *adev) 635 { 636 struct kfd_process *p; 637 int32_t gpu_idx, gpuid; 638 int r; 639 640 p = container_of(prange->svms, struct kfd_process, svms); 641 642 r = kfd_process_gpuid_from_adev(p, adev, &gpuid, &gpu_idx); 643 if (r) { 644 pr_debug("failed to get device id by adev %p\n", adev); 645 return NULL; 646 } 647 648 return kfd_process_device_from_gpuidx(p, gpu_idx); 649 } 650 651 static int svm_range_bo_validate(void *param, struct amdgpu_bo *bo) 652 { 653 struct ttm_operation_ctx ctx = { false, false }; 654 655 amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_VRAM); 656 657 return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); 658 } 659 660 static int 661 svm_range_check_attr(struct kfd_process *p, 662 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs) 663 { 664 uint32_t i; 665 666 for (i = 0; i < nattr; i++) { 667 uint32_t val = attrs[i].value; 668 int gpuidx = MAX_GPU_INSTANCE; 669 670 switch (attrs[i].type) { 671 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 672 if (val != KFD_IOCTL_SVM_LOCATION_SYSMEM && 673 val != KFD_IOCTL_SVM_LOCATION_UNDEFINED) 674 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 675 break; 676 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 677 if (val != KFD_IOCTL_SVM_LOCATION_SYSMEM) 678 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 679 break; 680 case KFD_IOCTL_SVM_ATTR_ACCESS: 681 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 682 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 683 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 684 break; 685 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 686 break; 687 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 688 break; 689 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 690 break; 691 default: 692 pr_debug("unknown attr type 0x%x\n", attrs[i].type); 693 return -EINVAL; 694 } 695 696 if (gpuidx < 0) { 697 pr_debug("no GPU 0x%x found\n", val); 698 return -EINVAL; 699 } else if (gpuidx < MAX_GPU_INSTANCE && 700 !test_bit(gpuidx, p->svms.bitmap_supported)) { 701 pr_debug("GPU 0x%x not supported\n", val); 702 return -EINVAL; 703 } 704 } 705 706 return 0; 707 } 708 709 static void 710 svm_range_apply_attrs(struct kfd_process *p, struct svm_range *prange, 711 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs, 712 bool *update_mapping) 713 { 714 uint32_t i; 715 int gpuidx; 716 717 for (i = 0; i < nattr; i++) { 718 switch (attrs[i].type) { 719 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 720 prange->preferred_loc = attrs[i].value; 721 break; 722 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 723 prange->prefetch_loc = attrs[i].value; 724 break; 725 case KFD_IOCTL_SVM_ATTR_ACCESS: 726 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 727 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 728 *update_mapping = true; 729 gpuidx = kfd_process_gpuidx_from_gpuid(p, 730 attrs[i].value); 731 if (attrs[i].type == KFD_IOCTL_SVM_ATTR_NO_ACCESS) { 732 bitmap_clear(prange->bitmap_access, gpuidx, 1); 733 bitmap_clear(prange->bitmap_aip, gpuidx, 1); 734 } else if (attrs[i].type == KFD_IOCTL_SVM_ATTR_ACCESS) { 735 bitmap_set(prange->bitmap_access, gpuidx, 1); 736 bitmap_clear(prange->bitmap_aip, gpuidx, 1); 737 } else { 738 bitmap_clear(prange->bitmap_access, gpuidx, 1); 739 bitmap_set(prange->bitmap_aip, gpuidx, 1); 740 } 741 break; 742 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 743 *update_mapping = true; 744 prange->flags |= attrs[i].value; 745 break; 746 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 747 *update_mapping = true; 748 prange->flags &= ~attrs[i].value; 749 break; 750 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 751 prange->granularity = attrs[i].value; 752 break; 753 default: 754 WARN_ONCE(1, "svm_range_check_attrs wasn't called?"); 755 } 756 } 757 } 758 759 static bool 760 svm_range_is_same_attrs(struct kfd_process *p, struct svm_range *prange, 761 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs) 762 { 763 uint32_t i; 764 int gpuidx; 765 766 for (i = 0; i < nattr; i++) { 767 switch (attrs[i].type) { 768 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 769 if (prange->preferred_loc != attrs[i].value) 770 return false; 771 break; 772 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 773 /* Prefetch should always trigger a migration even 774 * if the value of the attribute didn't change. 775 */ 776 return false; 777 case KFD_IOCTL_SVM_ATTR_ACCESS: 778 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 779 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 780 gpuidx = kfd_process_gpuidx_from_gpuid(p, 781 attrs[i].value); 782 if (attrs[i].type == KFD_IOCTL_SVM_ATTR_NO_ACCESS) { 783 if (test_bit(gpuidx, prange->bitmap_access) || 784 test_bit(gpuidx, prange->bitmap_aip)) 785 return false; 786 } else if (attrs[i].type == KFD_IOCTL_SVM_ATTR_ACCESS) { 787 if (!test_bit(gpuidx, prange->bitmap_access)) 788 return false; 789 } else { 790 if (!test_bit(gpuidx, prange->bitmap_aip)) 791 return false; 792 } 793 break; 794 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 795 if ((prange->flags & attrs[i].value) != attrs[i].value) 796 return false; 797 break; 798 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 799 if ((prange->flags & attrs[i].value) != 0) 800 return false; 801 break; 802 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 803 if (prange->granularity != attrs[i].value) 804 return false; 805 break; 806 default: 807 WARN_ONCE(1, "svm_range_check_attrs wasn't called?"); 808 } 809 } 810 811 return true; 812 } 813 814 /** 815 * svm_range_debug_dump - print all range information from svms 816 * @svms: svm range list header 817 * 818 * debug output svm range start, end, prefetch location from svms 819 * interval tree and link list 820 * 821 * Context: The caller must hold svms->lock 822 */ 823 static void svm_range_debug_dump(struct svm_range_list *svms) 824 { 825 struct interval_tree_node *node; 826 struct svm_range *prange; 827 828 pr_debug("dump svms 0x%p list\n", svms); 829 pr_debug("range\tstart\tpage\tend\t\tlocation\n"); 830 831 list_for_each_entry(prange, &svms->list, list) { 832 pr_debug("0x%p 0x%lx\t0x%llx\t0x%llx\t0x%x\n", 833 prange, prange->start, prange->npages, 834 prange->start + prange->npages - 1, 835 prange->actual_loc); 836 } 837 838 pr_debug("dump svms 0x%p interval tree\n", svms); 839 pr_debug("range\tstart\tpage\tend\t\tlocation\n"); 840 node = interval_tree_iter_first(&svms->objects, 0, ~0ULL); 841 while (node) { 842 prange = container_of(node, struct svm_range, it_node); 843 pr_debug("0x%p 0x%lx\t0x%llx\t0x%llx\t0x%x\n", 844 prange, prange->start, prange->npages, 845 prange->start + prange->npages - 1, 846 prange->actual_loc); 847 node = interval_tree_iter_next(node, 0, ~0ULL); 848 } 849 } 850 851 static int 852 svm_range_split_array(void *ppnew, void *ppold, size_t size, 853 uint64_t old_start, uint64_t old_n, 854 uint64_t new_start, uint64_t new_n) 855 { 856 unsigned char *new, *old, *pold; 857 uint64_t d; 858 859 if (!ppold) 860 return 0; 861 pold = *(unsigned char **)ppold; 862 if (!pold) 863 return 0; 864 865 new = kvmalloc_array(new_n, size, GFP_KERNEL); 866 if (!new) 867 return -ENOMEM; 868 869 d = (new_start - old_start) * size; 870 memcpy(new, pold + d, new_n * size); 871 872 old = kvmalloc_array(old_n, size, GFP_KERNEL); 873 if (!old) { 874 kvfree(new); 875 return -ENOMEM; 876 } 877 878 d = (new_start == old_start) ? new_n * size : 0; 879 memcpy(old, pold + d, old_n * size); 880 881 kvfree(pold); 882 *(void **)ppold = old; 883 *(void **)ppnew = new; 884 885 return 0; 886 } 887 888 static int 889 svm_range_split_pages(struct svm_range *new, struct svm_range *old, 890 uint64_t start, uint64_t last) 891 { 892 uint64_t npages = last - start + 1; 893 int i, r; 894 895 for (i = 0; i < MAX_GPU_INSTANCE; i++) { 896 r = svm_range_split_array(&new->dma_addr[i], &old->dma_addr[i], 897 sizeof(*old->dma_addr[i]), old->start, 898 npages, new->start, new->npages); 899 if (r) 900 return r; 901 } 902 903 return 0; 904 } 905 906 static int 907 svm_range_split_nodes(struct svm_range *new, struct svm_range *old, 908 uint64_t start, uint64_t last) 909 { 910 uint64_t npages = last - start + 1; 911 912 pr_debug("svms 0x%p new prange 0x%p start 0x%lx [0x%llx 0x%llx]\n", 913 new->svms, new, new->start, start, last); 914 915 if (new->start == old->start) { 916 new->offset = old->offset; 917 old->offset += new->npages; 918 } else { 919 new->offset = old->offset + npages; 920 } 921 922 new->svm_bo = svm_range_bo_ref(old->svm_bo); 923 new->ttm_res = old->ttm_res; 924 925 spin_lock(&new->svm_bo->list_lock); 926 list_add(&new->svm_bo_list, &new->svm_bo->range_list); 927 spin_unlock(&new->svm_bo->list_lock); 928 929 return 0; 930 } 931 932 /** 933 * svm_range_split_adjust - split range and adjust 934 * 935 * @new: new range 936 * @old: the old range 937 * @start: the old range adjust to start address in pages 938 * @last: the old range adjust to last address in pages 939 * 940 * Copy system memory dma_addr or vram ttm_res in old range to new 941 * range from new_start up to size new->npages, the remaining old range is from 942 * start to last 943 * 944 * Return: 945 * 0 - OK, -ENOMEM - out of memory 946 */ 947 static int 948 svm_range_split_adjust(struct svm_range *new, struct svm_range *old, 949 uint64_t start, uint64_t last) 950 { 951 int r; 952 953 pr_debug("svms 0x%p new 0x%lx old [0x%lx 0x%lx] => [0x%llx 0x%llx]\n", 954 new->svms, new->start, old->start, old->last, start, last); 955 956 if (new->start < old->start || 957 new->last > old->last) { 958 WARN_ONCE(1, "invalid new range start or last\n"); 959 return -EINVAL; 960 } 961 962 r = svm_range_split_pages(new, old, start, last); 963 if (r) 964 return r; 965 966 if (old->actual_loc && old->ttm_res) { 967 r = svm_range_split_nodes(new, old, start, last); 968 if (r) 969 return r; 970 } 971 972 old->npages = last - start + 1; 973 old->start = start; 974 old->last = last; 975 new->flags = old->flags; 976 new->preferred_loc = old->preferred_loc; 977 new->prefetch_loc = old->prefetch_loc; 978 new->actual_loc = old->actual_loc; 979 new->granularity = old->granularity; 980 new->mapped_to_gpu = old->mapped_to_gpu; 981 bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE); 982 bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE); 983 984 return 0; 985 } 986 987 /** 988 * svm_range_split - split a range in 2 ranges 989 * 990 * @prange: the svm range to split 991 * @start: the remaining range start address in pages 992 * @last: the remaining range last address in pages 993 * @new: the result new range generated 994 * 995 * Two cases only: 996 * case 1: if start == prange->start 997 * prange ==> prange[start, last] 998 * new range [last + 1, prange->last] 999 * 1000 * case 2: if last == prange->last 1001 * prange ==> prange[start, last] 1002 * new range [prange->start, start - 1] 1003 * 1004 * Return: 1005 * 0 - OK, -ENOMEM - out of memory, -EINVAL - invalid start, last 1006 */ 1007 static int 1008 svm_range_split(struct svm_range *prange, uint64_t start, uint64_t last, 1009 struct svm_range **new) 1010 { 1011 uint64_t old_start = prange->start; 1012 uint64_t old_last = prange->last; 1013 struct svm_range_list *svms; 1014 int r = 0; 1015 1016 pr_debug("svms 0x%p [0x%llx 0x%llx] to [0x%llx 0x%llx]\n", prange->svms, 1017 old_start, old_last, start, last); 1018 1019 if (old_start != start && old_last != last) 1020 return -EINVAL; 1021 if (start < old_start || last > old_last) 1022 return -EINVAL; 1023 1024 svms = prange->svms; 1025 if (old_start == start) 1026 *new = svm_range_new(svms, last + 1, old_last, false); 1027 else 1028 *new = svm_range_new(svms, old_start, start - 1, false); 1029 if (!*new) 1030 return -ENOMEM; 1031 1032 r = svm_range_split_adjust(*new, prange, start, last); 1033 if (r) { 1034 pr_debug("failed %d split [0x%llx 0x%llx] to [0x%llx 0x%llx]\n", 1035 r, old_start, old_last, start, last); 1036 svm_range_free(*new, false); 1037 *new = NULL; 1038 } 1039 1040 return r; 1041 } 1042 1043 static int 1044 svm_range_split_tail(struct svm_range *prange, 1045 uint64_t new_last, struct list_head *insert_list) 1046 { 1047 struct svm_range *tail; 1048 int r = svm_range_split(prange, prange->start, new_last, &tail); 1049 1050 if (!r) 1051 list_add(&tail->list, insert_list); 1052 return r; 1053 } 1054 1055 static int 1056 svm_range_split_head(struct svm_range *prange, 1057 uint64_t new_start, struct list_head *insert_list) 1058 { 1059 struct svm_range *head; 1060 int r = svm_range_split(prange, new_start, prange->last, &head); 1061 1062 if (!r) 1063 list_add(&head->list, insert_list); 1064 return r; 1065 } 1066 1067 static void 1068 svm_range_add_child(struct svm_range *prange, struct mm_struct *mm, 1069 struct svm_range *pchild, enum svm_work_list_ops op) 1070 { 1071 pr_debug("add child 0x%p [0x%lx 0x%lx] to prange 0x%p child list %d\n", 1072 pchild, pchild->start, pchild->last, prange, op); 1073 1074 pchild->work_item.mm = mm; 1075 pchild->work_item.op = op; 1076 list_add_tail(&pchild->child_list, &prange->child_list); 1077 } 1078 1079 /** 1080 * svm_range_split_by_granularity - collect ranges within granularity boundary 1081 * 1082 * @p: the process with svms list 1083 * @mm: mm structure 1084 * @addr: the vm fault address in pages, to split the prange 1085 * @parent: parent range if prange is from child list 1086 * @prange: prange to split 1087 * 1088 * Trims @prange to be a single aligned block of prange->granularity if 1089 * possible. The head and tail are added to the child_list in @parent. 1090 * 1091 * Context: caller must hold mmap_read_lock and prange->lock 1092 * 1093 * Return: 1094 * 0 - OK, otherwise error code 1095 */ 1096 int 1097 svm_range_split_by_granularity(struct kfd_process *p, struct mm_struct *mm, 1098 unsigned long addr, struct svm_range *parent, 1099 struct svm_range *prange) 1100 { 1101 struct svm_range *head, *tail; 1102 unsigned long start, last, size; 1103 int r; 1104 1105 /* Align splited range start and size to granularity size, then a single 1106 * PTE will be used for whole range, this reduces the number of PTE 1107 * updated and the L1 TLB space used for translation. 1108 */ 1109 size = 1UL << prange->granularity; 1110 start = ALIGN_DOWN(addr, size); 1111 last = ALIGN(addr + 1, size) - 1; 1112 1113 pr_debug("svms 0x%p split [0x%lx 0x%lx] to [0x%lx 0x%lx] size 0x%lx\n", 1114 prange->svms, prange->start, prange->last, start, last, size); 1115 1116 if (start > prange->start) { 1117 r = svm_range_split(prange, start, prange->last, &head); 1118 if (r) 1119 return r; 1120 svm_range_add_child(parent, mm, head, SVM_OP_ADD_RANGE); 1121 } 1122 1123 if (last < prange->last) { 1124 r = svm_range_split(prange, prange->start, last, &tail); 1125 if (r) 1126 return r; 1127 svm_range_add_child(parent, mm, tail, SVM_OP_ADD_RANGE); 1128 } 1129 1130 /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ 1131 if (p->xnack_enabled && prange->work_item.op == SVM_OP_ADD_RANGE) { 1132 prange->work_item.op = SVM_OP_ADD_RANGE_AND_MAP; 1133 pr_debug("change prange 0x%p [0x%lx 0x%lx] op %d\n", 1134 prange, prange->start, prange->last, 1135 SVM_OP_ADD_RANGE_AND_MAP); 1136 } 1137 return 0; 1138 } 1139 1140 static uint64_t 1141 svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange, 1142 int domain) 1143 { 1144 struct amdgpu_device *bo_adev; 1145 uint32_t flags = prange->flags; 1146 uint32_t mapping_flags = 0; 1147 uint64_t pte_flags; 1148 bool snoop = (domain != SVM_RANGE_VRAM_DOMAIN); 1149 bool coherent = flags & KFD_IOCTL_SVM_FLAG_COHERENT; 1150 1151 if (domain == SVM_RANGE_VRAM_DOMAIN) 1152 bo_adev = amdgpu_ttm_adev(prange->svm_bo->bo->tbo.bdev); 1153 1154 switch (KFD_GC_VERSION(adev->kfd.dev)) { 1155 case IP_VERSION(9, 4, 1): 1156 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1157 if (bo_adev == adev) { 1158 mapping_flags |= coherent ? 1159 AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW; 1160 } else { 1161 mapping_flags |= coherent ? 1162 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1163 if (amdgpu_xgmi_same_hive(adev, bo_adev)) 1164 snoop = true; 1165 } 1166 } else { 1167 mapping_flags |= coherent ? 1168 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1169 } 1170 break; 1171 case IP_VERSION(9, 4, 2): 1172 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1173 if (bo_adev == adev) { 1174 mapping_flags |= coherent ? 1175 AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW; 1176 if (adev->gmc.xgmi.connected_to_cpu) 1177 snoop = true; 1178 } else { 1179 mapping_flags |= coherent ? 1180 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1181 if (amdgpu_xgmi_same_hive(adev, bo_adev)) 1182 snoop = true; 1183 } 1184 } else { 1185 mapping_flags |= coherent ? 1186 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1187 } 1188 break; 1189 default: 1190 mapping_flags |= coherent ? 1191 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1192 } 1193 1194 mapping_flags |= AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE; 1195 1196 if (flags & KFD_IOCTL_SVM_FLAG_GPU_RO) 1197 mapping_flags &= ~AMDGPU_VM_PAGE_WRITEABLE; 1198 if (flags & KFD_IOCTL_SVM_FLAG_GPU_EXEC) 1199 mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE; 1200 1201 pte_flags = AMDGPU_PTE_VALID; 1202 pte_flags |= (domain == SVM_RANGE_VRAM_DOMAIN) ? 0 : AMDGPU_PTE_SYSTEM; 1203 pte_flags |= snoop ? AMDGPU_PTE_SNOOPED : 0; 1204 1205 pte_flags |= amdgpu_gem_va_map_flags(adev, mapping_flags); 1206 return pte_flags; 1207 } 1208 1209 static int 1210 svm_range_unmap_from_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm, 1211 uint64_t start, uint64_t last, 1212 struct dma_fence **fence) 1213 { 1214 uint64_t init_pte_value = 0; 1215 1216 pr_debug("[0x%llx 0x%llx]\n", start, last); 1217 1218 return amdgpu_vm_update_range(adev, vm, false, true, true, NULL, start, 1219 last, init_pte_value, 0, 0, NULL, NULL, 1220 fence); 1221 } 1222 1223 static int 1224 svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start, 1225 unsigned long last, uint32_t trigger) 1226 { 1227 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 1228 struct kfd_process_device *pdd; 1229 struct dma_fence *fence = NULL; 1230 struct kfd_process *p; 1231 uint32_t gpuidx; 1232 int r = 0; 1233 1234 if (!prange->mapped_to_gpu) { 1235 pr_debug("prange 0x%p [0x%lx 0x%lx] not mapped to GPU\n", 1236 prange, prange->start, prange->last); 1237 return 0; 1238 } 1239 1240 if (prange->start == start && prange->last == last) { 1241 pr_debug("unmap svms 0x%p prange 0x%p\n", prange->svms, prange); 1242 prange->mapped_to_gpu = false; 1243 } 1244 1245 bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip, 1246 MAX_GPU_INSTANCE); 1247 p = container_of(prange->svms, struct kfd_process, svms); 1248 1249 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 1250 pr_debug("unmap from gpu idx 0x%x\n", gpuidx); 1251 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1252 if (!pdd) { 1253 pr_debug("failed to find device idx %d\n", gpuidx); 1254 return -EINVAL; 1255 } 1256 1257 kfd_smi_event_unmap_from_gpu(pdd->dev, p->lead_thread->pid, 1258 start, last, trigger); 1259 1260 r = svm_range_unmap_from_gpu(pdd->dev->adev, 1261 drm_priv_to_vm(pdd->drm_priv), 1262 start, last, &fence); 1263 if (r) 1264 break; 1265 1266 if (fence) { 1267 r = dma_fence_wait(fence, false); 1268 dma_fence_put(fence); 1269 fence = NULL; 1270 if (r) 1271 break; 1272 } 1273 kfd_flush_tlb(pdd, TLB_FLUSH_HEAVYWEIGHT); 1274 } 1275 1276 return r; 1277 } 1278 1279 static int 1280 svm_range_map_to_gpu(struct kfd_process_device *pdd, struct svm_range *prange, 1281 unsigned long offset, unsigned long npages, bool readonly, 1282 dma_addr_t *dma_addr, struct amdgpu_device *bo_adev, 1283 struct dma_fence **fence, bool flush_tlb) 1284 { 1285 struct amdgpu_device *adev = pdd->dev->adev; 1286 struct amdgpu_vm *vm = drm_priv_to_vm(pdd->drm_priv); 1287 uint64_t pte_flags; 1288 unsigned long last_start; 1289 int last_domain; 1290 int r = 0; 1291 int64_t i, j; 1292 1293 last_start = prange->start + offset; 1294 1295 pr_debug("svms 0x%p [0x%lx 0x%lx] readonly %d\n", prange->svms, 1296 last_start, last_start + npages - 1, readonly); 1297 1298 for (i = offset; i < offset + npages; i++) { 1299 last_domain = dma_addr[i] & SVM_RANGE_VRAM_DOMAIN; 1300 dma_addr[i] &= ~SVM_RANGE_VRAM_DOMAIN; 1301 1302 /* Collect all pages in the same address range and memory domain 1303 * that can be mapped with a single call to update mapping. 1304 */ 1305 if (i < offset + npages - 1 && 1306 last_domain == (dma_addr[i + 1] & SVM_RANGE_VRAM_DOMAIN)) 1307 continue; 1308 1309 pr_debug("Mapping range [0x%lx 0x%llx] on domain: %s\n", 1310 last_start, prange->start + i, last_domain ? "GPU" : "CPU"); 1311 1312 pte_flags = svm_range_get_pte_flags(adev, prange, last_domain); 1313 if (readonly) 1314 pte_flags &= ~AMDGPU_PTE_WRITEABLE; 1315 1316 pr_debug("svms 0x%p map [0x%lx 0x%llx] vram %d PTE 0x%llx\n", 1317 prange->svms, last_start, prange->start + i, 1318 (last_domain == SVM_RANGE_VRAM_DOMAIN) ? 1 : 0, 1319 pte_flags); 1320 1321 r = amdgpu_vm_update_range(adev, vm, false, false, flush_tlb, NULL, 1322 last_start, prange->start + i, 1323 pte_flags, 1324 (last_start - prange->start) << PAGE_SHIFT, 1325 bo_adev ? bo_adev->vm_manager.vram_base_offset : 0, 1326 NULL, dma_addr, &vm->last_update); 1327 1328 for (j = last_start - prange->start; j <= i; j++) 1329 dma_addr[j] |= last_domain; 1330 1331 if (r) { 1332 pr_debug("failed %d to map to gpu 0x%lx\n", r, prange->start); 1333 goto out; 1334 } 1335 last_start = prange->start + i + 1; 1336 } 1337 1338 r = amdgpu_vm_update_pdes(adev, vm, false); 1339 if (r) { 1340 pr_debug("failed %d to update directories 0x%lx\n", r, 1341 prange->start); 1342 goto out; 1343 } 1344 1345 if (fence) 1346 *fence = dma_fence_get(vm->last_update); 1347 1348 out: 1349 return r; 1350 } 1351 1352 static int 1353 svm_range_map_to_gpus(struct svm_range *prange, unsigned long offset, 1354 unsigned long npages, bool readonly, 1355 unsigned long *bitmap, bool wait, bool flush_tlb) 1356 { 1357 struct kfd_process_device *pdd; 1358 struct amdgpu_device *bo_adev; 1359 struct kfd_process *p; 1360 struct dma_fence *fence = NULL; 1361 uint32_t gpuidx; 1362 int r = 0; 1363 1364 if (prange->svm_bo && prange->ttm_res) 1365 bo_adev = amdgpu_ttm_adev(prange->svm_bo->bo->tbo.bdev); 1366 else 1367 bo_adev = NULL; 1368 1369 p = container_of(prange->svms, struct kfd_process, svms); 1370 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 1371 pr_debug("mapping to gpu idx 0x%x\n", gpuidx); 1372 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1373 if (!pdd) { 1374 pr_debug("failed to find device idx %d\n", gpuidx); 1375 return -EINVAL; 1376 } 1377 1378 pdd = kfd_bind_process_to_device(pdd->dev, p); 1379 if (IS_ERR(pdd)) 1380 return -EINVAL; 1381 1382 if (bo_adev && pdd->dev->adev != bo_adev && 1383 !amdgpu_xgmi_same_hive(pdd->dev->adev, bo_adev)) { 1384 pr_debug("cannot map to device idx %d\n", gpuidx); 1385 continue; 1386 } 1387 1388 r = svm_range_map_to_gpu(pdd, prange, offset, npages, readonly, 1389 prange->dma_addr[gpuidx], 1390 bo_adev, wait ? &fence : NULL, 1391 flush_tlb); 1392 if (r) 1393 break; 1394 1395 if (fence) { 1396 r = dma_fence_wait(fence, false); 1397 dma_fence_put(fence); 1398 fence = NULL; 1399 if (r) { 1400 pr_debug("failed %d to dma fence wait\n", r); 1401 break; 1402 } 1403 } 1404 1405 kfd_flush_tlb(pdd, TLB_FLUSH_LEGACY); 1406 } 1407 1408 return r; 1409 } 1410 1411 struct svm_validate_context { 1412 struct kfd_process *process; 1413 struct svm_range *prange; 1414 bool intr; 1415 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 1416 struct ttm_validate_buffer tv[MAX_GPU_INSTANCE]; 1417 struct list_head validate_list; 1418 struct ww_acquire_ctx ticket; 1419 }; 1420 1421 static int svm_range_reserve_bos(struct svm_validate_context *ctx) 1422 { 1423 struct kfd_process_device *pdd; 1424 struct amdgpu_vm *vm; 1425 uint32_t gpuidx; 1426 int r; 1427 1428 INIT_LIST_HEAD(&ctx->validate_list); 1429 for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) { 1430 pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx); 1431 if (!pdd) { 1432 pr_debug("failed to find device idx %d\n", gpuidx); 1433 return -EINVAL; 1434 } 1435 vm = drm_priv_to_vm(pdd->drm_priv); 1436 1437 ctx->tv[gpuidx].bo = &vm->root.bo->tbo; 1438 ctx->tv[gpuidx].num_shared = 4; 1439 list_add(&ctx->tv[gpuidx].head, &ctx->validate_list); 1440 } 1441 1442 r = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->validate_list, 1443 ctx->intr, NULL); 1444 if (r) { 1445 pr_debug("failed %d to reserve bo\n", r); 1446 return r; 1447 } 1448 1449 for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) { 1450 pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx); 1451 if (!pdd) { 1452 pr_debug("failed to find device idx %d\n", gpuidx); 1453 r = -EINVAL; 1454 goto unreserve_out; 1455 } 1456 1457 r = amdgpu_vm_validate_pt_bos(pdd->dev->adev, 1458 drm_priv_to_vm(pdd->drm_priv), 1459 svm_range_bo_validate, NULL); 1460 if (r) { 1461 pr_debug("failed %d validate pt bos\n", r); 1462 goto unreserve_out; 1463 } 1464 } 1465 1466 return 0; 1467 1468 unreserve_out: 1469 ttm_eu_backoff_reservation(&ctx->ticket, &ctx->validate_list); 1470 return r; 1471 } 1472 1473 static void svm_range_unreserve_bos(struct svm_validate_context *ctx) 1474 { 1475 ttm_eu_backoff_reservation(&ctx->ticket, &ctx->validate_list); 1476 } 1477 1478 static void *kfd_svm_page_owner(struct kfd_process *p, int32_t gpuidx) 1479 { 1480 struct kfd_process_device *pdd; 1481 1482 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1483 1484 return SVM_ADEV_PGMAP_OWNER(pdd->dev->adev); 1485 } 1486 1487 /* 1488 * Validation+GPU mapping with concurrent invalidation (MMU notifiers) 1489 * 1490 * To prevent concurrent destruction or change of range attributes, the 1491 * svm_read_lock must be held. The caller must not hold the svm_write_lock 1492 * because that would block concurrent evictions and lead to deadlocks. To 1493 * serialize concurrent migrations or validations of the same range, the 1494 * prange->migrate_mutex must be held. 1495 * 1496 * For VRAM ranges, the SVM BO must be allocated and valid (protected by its 1497 * eviction fence. 1498 * 1499 * The following sequence ensures race-free validation and GPU mapping: 1500 * 1501 * 1. Reserve page table (and SVM BO if range is in VRAM) 1502 * 2. hmm_range_fault to get page addresses (if system memory) 1503 * 3. DMA-map pages (if system memory) 1504 * 4-a. Take notifier lock 1505 * 4-b. Check that pages still valid (mmu_interval_read_retry) 1506 * 4-c. Check that the range was not split or otherwise invalidated 1507 * 4-d. Update GPU page table 1508 * 4.e. Release notifier lock 1509 * 5. Release page table (and SVM BO) reservation 1510 */ 1511 static int svm_range_validate_and_map(struct mm_struct *mm, 1512 struct svm_range *prange, int32_t gpuidx, 1513 bool intr, bool wait, bool flush_tlb) 1514 { 1515 struct svm_validate_context ctx; 1516 unsigned long start, end, addr; 1517 struct kfd_process *p; 1518 void *owner; 1519 int32_t idx; 1520 int r = 0; 1521 1522 ctx.process = container_of(prange->svms, struct kfd_process, svms); 1523 ctx.prange = prange; 1524 ctx.intr = intr; 1525 1526 if (gpuidx < MAX_GPU_INSTANCE) { 1527 bitmap_zero(ctx.bitmap, MAX_GPU_INSTANCE); 1528 bitmap_set(ctx.bitmap, gpuidx, 1); 1529 } else if (ctx.process->xnack_enabled) { 1530 bitmap_copy(ctx.bitmap, prange->bitmap_aip, MAX_GPU_INSTANCE); 1531 1532 /* If prefetch range to GPU, or GPU retry fault migrate range to 1533 * GPU, which has ACCESS attribute to the range, create mapping 1534 * on that GPU. 1535 */ 1536 if (prange->actual_loc) { 1537 gpuidx = kfd_process_gpuidx_from_gpuid(ctx.process, 1538 prange->actual_loc); 1539 if (gpuidx < 0) { 1540 WARN_ONCE(1, "failed get device by id 0x%x\n", 1541 prange->actual_loc); 1542 return -EINVAL; 1543 } 1544 if (test_bit(gpuidx, prange->bitmap_access)) 1545 bitmap_set(ctx.bitmap, gpuidx, 1); 1546 } 1547 } else { 1548 bitmap_or(ctx.bitmap, prange->bitmap_access, 1549 prange->bitmap_aip, MAX_GPU_INSTANCE); 1550 } 1551 1552 if (bitmap_empty(ctx.bitmap, MAX_GPU_INSTANCE)) { 1553 if (!prange->mapped_to_gpu) 1554 return 0; 1555 1556 bitmap_copy(ctx.bitmap, prange->bitmap_access, MAX_GPU_INSTANCE); 1557 } 1558 1559 if (prange->actual_loc && !prange->ttm_res) { 1560 /* This should never happen. actual_loc gets set by 1561 * svm_migrate_ram_to_vram after allocating a BO. 1562 */ 1563 WARN_ONCE(1, "VRAM BO missing during validation\n"); 1564 return -EINVAL; 1565 } 1566 1567 svm_range_reserve_bos(&ctx); 1568 1569 p = container_of(prange->svms, struct kfd_process, svms); 1570 owner = kfd_svm_page_owner(p, find_first_bit(ctx.bitmap, 1571 MAX_GPU_INSTANCE)); 1572 for_each_set_bit(idx, ctx.bitmap, MAX_GPU_INSTANCE) { 1573 if (kfd_svm_page_owner(p, idx) != owner) { 1574 owner = NULL; 1575 break; 1576 } 1577 } 1578 1579 start = prange->start << PAGE_SHIFT; 1580 end = (prange->last + 1) << PAGE_SHIFT; 1581 for (addr = start; addr < end && !r; ) { 1582 struct hmm_range *hmm_range; 1583 struct vm_area_struct *vma; 1584 unsigned long next; 1585 unsigned long offset; 1586 unsigned long npages; 1587 bool readonly; 1588 1589 vma = find_vma(mm, addr); 1590 if (!vma || addr < vma->vm_start) { 1591 r = -EFAULT; 1592 goto unreserve_out; 1593 } 1594 readonly = !(vma->vm_flags & VM_WRITE); 1595 1596 next = min(vma->vm_end, end); 1597 npages = (next - addr) >> PAGE_SHIFT; 1598 WRITE_ONCE(p->svms.faulting_task, current); 1599 r = amdgpu_hmm_range_get_pages(&prange->notifier, mm, NULL, 1600 addr, npages, &hmm_range, 1601 readonly, true, owner); 1602 WRITE_ONCE(p->svms.faulting_task, NULL); 1603 if (r) { 1604 pr_debug("failed %d to get svm range pages\n", r); 1605 goto unreserve_out; 1606 } 1607 1608 offset = (addr - start) >> PAGE_SHIFT; 1609 r = svm_range_dma_map(prange, ctx.bitmap, offset, npages, 1610 hmm_range->hmm_pfns); 1611 if (r) { 1612 pr_debug("failed %d to dma map range\n", r); 1613 goto unreserve_out; 1614 } 1615 1616 svm_range_lock(prange); 1617 if (amdgpu_hmm_range_get_pages_done(hmm_range)) { 1618 pr_debug("hmm update the range, need validate again\n"); 1619 r = -EAGAIN; 1620 goto unlock_out; 1621 } 1622 if (!list_empty(&prange->child_list)) { 1623 pr_debug("range split by unmap in parallel, validate again\n"); 1624 r = -EAGAIN; 1625 goto unlock_out; 1626 } 1627 1628 r = svm_range_map_to_gpus(prange, offset, npages, readonly, 1629 ctx.bitmap, wait, flush_tlb); 1630 1631 unlock_out: 1632 svm_range_unlock(prange); 1633 1634 addr = next; 1635 } 1636 1637 if (addr == end) { 1638 prange->validated_once = true; 1639 prange->mapped_to_gpu = true; 1640 } 1641 1642 unreserve_out: 1643 svm_range_unreserve_bos(&ctx); 1644 1645 if (!r) 1646 prange->validate_timestamp = ktime_get_boottime(); 1647 1648 return r; 1649 } 1650 1651 /** 1652 * svm_range_list_lock_and_flush_work - flush pending deferred work 1653 * 1654 * @svms: the svm range list 1655 * @mm: the mm structure 1656 * 1657 * Context: Returns with mmap write lock held, pending deferred work flushed 1658 * 1659 */ 1660 void 1661 svm_range_list_lock_and_flush_work(struct svm_range_list *svms, 1662 struct mm_struct *mm) 1663 { 1664 retry_flush_work: 1665 flush_work(&svms->deferred_list_work); 1666 mmap_write_lock(mm); 1667 1668 if (list_empty(&svms->deferred_range_list)) 1669 return; 1670 mmap_write_unlock(mm); 1671 pr_debug("retry flush\n"); 1672 goto retry_flush_work; 1673 } 1674 1675 static void svm_range_restore_work(struct work_struct *work) 1676 { 1677 struct delayed_work *dwork = to_delayed_work(work); 1678 struct amdkfd_process_info *process_info; 1679 struct svm_range_list *svms; 1680 struct svm_range *prange; 1681 struct kfd_process *p; 1682 struct mm_struct *mm; 1683 int evicted_ranges; 1684 int invalid; 1685 int r; 1686 1687 svms = container_of(dwork, struct svm_range_list, restore_work); 1688 evicted_ranges = atomic_read(&svms->evicted_ranges); 1689 if (!evicted_ranges) 1690 return; 1691 1692 pr_debug("restore svm ranges\n"); 1693 1694 p = container_of(svms, struct kfd_process, svms); 1695 process_info = p->kgd_process_info; 1696 1697 /* Keep mm reference when svm_range_validate_and_map ranges */ 1698 mm = get_task_mm(p->lead_thread); 1699 if (!mm) { 1700 pr_debug("svms 0x%p process mm gone\n", svms); 1701 return; 1702 } 1703 1704 mutex_lock(&process_info->lock); 1705 svm_range_list_lock_and_flush_work(svms, mm); 1706 mutex_lock(&svms->lock); 1707 1708 evicted_ranges = atomic_read(&svms->evicted_ranges); 1709 1710 list_for_each_entry(prange, &svms->list, list) { 1711 invalid = atomic_read(&prange->invalid); 1712 if (!invalid) 1713 continue; 1714 1715 pr_debug("restoring svms 0x%p prange 0x%p [0x%lx %lx] inv %d\n", 1716 prange->svms, prange, prange->start, prange->last, 1717 invalid); 1718 1719 /* 1720 * If range is migrating, wait for migration is done. 1721 */ 1722 mutex_lock(&prange->migrate_mutex); 1723 1724 r = svm_range_validate_and_map(mm, prange, MAX_GPU_INSTANCE, 1725 false, true, false); 1726 if (r) 1727 pr_debug("failed %d to map 0x%lx to gpus\n", r, 1728 prange->start); 1729 1730 mutex_unlock(&prange->migrate_mutex); 1731 if (r) 1732 goto out_reschedule; 1733 1734 if (atomic_cmpxchg(&prange->invalid, invalid, 0) != invalid) 1735 goto out_reschedule; 1736 } 1737 1738 if (atomic_cmpxchg(&svms->evicted_ranges, evicted_ranges, 0) != 1739 evicted_ranges) 1740 goto out_reschedule; 1741 1742 evicted_ranges = 0; 1743 1744 r = kgd2kfd_resume_mm(mm); 1745 if (r) { 1746 /* No recovery from this failure. Probably the CP is 1747 * hanging. No point trying again. 1748 */ 1749 pr_debug("failed %d to resume KFD\n", r); 1750 } 1751 1752 pr_debug("restore svm ranges successfully\n"); 1753 1754 out_reschedule: 1755 mutex_unlock(&svms->lock); 1756 mmap_write_unlock(mm); 1757 mutex_unlock(&process_info->lock); 1758 1759 /* If validation failed, reschedule another attempt */ 1760 if (evicted_ranges) { 1761 pr_debug("reschedule to restore svm range\n"); 1762 schedule_delayed_work(&svms->restore_work, 1763 msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS)); 1764 1765 kfd_smi_event_queue_restore_rescheduled(mm); 1766 } 1767 mmput(mm); 1768 } 1769 1770 /** 1771 * svm_range_evict - evict svm range 1772 * @prange: svm range structure 1773 * @mm: current process mm_struct 1774 * @start: starting process queue number 1775 * @last: last process queue number 1776 * 1777 * Stop all queues of the process to ensure GPU doesn't access the memory, then 1778 * return to let CPU evict the buffer and proceed CPU pagetable update. 1779 * 1780 * Don't need use lock to sync cpu pagetable invalidation with GPU execution. 1781 * If invalidation happens while restore work is running, restore work will 1782 * restart to ensure to get the latest CPU pages mapping to GPU, then start 1783 * the queues. 1784 */ 1785 static int 1786 svm_range_evict(struct svm_range *prange, struct mm_struct *mm, 1787 unsigned long start, unsigned long last, 1788 enum mmu_notifier_event event) 1789 { 1790 struct svm_range_list *svms = prange->svms; 1791 struct svm_range *pchild; 1792 struct kfd_process *p; 1793 int r = 0; 1794 1795 p = container_of(svms, struct kfd_process, svms); 1796 1797 pr_debug("invalidate svms 0x%p prange [0x%lx 0x%lx] [0x%lx 0x%lx]\n", 1798 svms, prange->start, prange->last, start, last); 1799 1800 if (!p->xnack_enabled || 1801 (prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) { 1802 int evicted_ranges; 1803 bool mapped = prange->mapped_to_gpu; 1804 1805 list_for_each_entry(pchild, &prange->child_list, child_list) { 1806 if (!pchild->mapped_to_gpu) 1807 continue; 1808 mapped = true; 1809 mutex_lock_nested(&pchild->lock, 1); 1810 if (pchild->start <= last && pchild->last >= start) { 1811 pr_debug("increment pchild invalid [0x%lx 0x%lx]\n", 1812 pchild->start, pchild->last); 1813 atomic_inc(&pchild->invalid); 1814 } 1815 mutex_unlock(&pchild->lock); 1816 } 1817 1818 if (!mapped) 1819 return r; 1820 1821 if (prange->start <= last && prange->last >= start) 1822 atomic_inc(&prange->invalid); 1823 1824 evicted_ranges = atomic_inc_return(&svms->evicted_ranges); 1825 if (evicted_ranges != 1) 1826 return r; 1827 1828 pr_debug("evicting svms 0x%p range [0x%lx 0x%lx]\n", 1829 prange->svms, prange->start, prange->last); 1830 1831 /* First eviction, stop the queues */ 1832 r = kgd2kfd_quiesce_mm(mm, KFD_QUEUE_EVICTION_TRIGGER_SVM); 1833 if (r) 1834 pr_debug("failed to quiesce KFD\n"); 1835 1836 pr_debug("schedule to restore svm %p ranges\n", svms); 1837 schedule_delayed_work(&svms->restore_work, 1838 msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS)); 1839 } else { 1840 unsigned long s, l; 1841 uint32_t trigger; 1842 1843 if (event == MMU_NOTIFY_MIGRATE) 1844 trigger = KFD_SVM_UNMAP_TRIGGER_MMU_NOTIFY_MIGRATE; 1845 else 1846 trigger = KFD_SVM_UNMAP_TRIGGER_MMU_NOTIFY; 1847 1848 pr_debug("invalidate unmap svms 0x%p [0x%lx 0x%lx] from GPUs\n", 1849 prange->svms, start, last); 1850 list_for_each_entry(pchild, &prange->child_list, child_list) { 1851 mutex_lock_nested(&pchild->lock, 1); 1852 s = max(start, pchild->start); 1853 l = min(last, pchild->last); 1854 if (l >= s) 1855 svm_range_unmap_from_gpus(pchild, s, l, trigger); 1856 mutex_unlock(&pchild->lock); 1857 } 1858 s = max(start, prange->start); 1859 l = min(last, prange->last); 1860 if (l >= s) 1861 svm_range_unmap_from_gpus(prange, s, l, trigger); 1862 } 1863 1864 return r; 1865 } 1866 1867 static struct svm_range *svm_range_clone(struct svm_range *old) 1868 { 1869 struct svm_range *new; 1870 1871 new = svm_range_new(old->svms, old->start, old->last, false); 1872 if (!new) 1873 return NULL; 1874 1875 if (old->svm_bo) { 1876 new->ttm_res = old->ttm_res; 1877 new->offset = old->offset; 1878 new->svm_bo = svm_range_bo_ref(old->svm_bo); 1879 spin_lock(&new->svm_bo->list_lock); 1880 list_add(&new->svm_bo_list, &new->svm_bo->range_list); 1881 spin_unlock(&new->svm_bo->list_lock); 1882 } 1883 new->flags = old->flags; 1884 new->preferred_loc = old->preferred_loc; 1885 new->prefetch_loc = old->prefetch_loc; 1886 new->actual_loc = old->actual_loc; 1887 new->granularity = old->granularity; 1888 new->mapped_to_gpu = old->mapped_to_gpu; 1889 bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE); 1890 bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE); 1891 1892 return new; 1893 } 1894 1895 void svm_range_set_max_pages(struct amdgpu_device *adev) 1896 { 1897 uint64_t max_pages; 1898 uint64_t pages, _pages; 1899 1900 /* 1/32 VRAM size in pages */ 1901 pages = adev->gmc.real_vram_size >> 17; 1902 pages = clamp(pages, 1ULL << 9, 1ULL << 18); 1903 pages = rounddown_pow_of_two(pages); 1904 do { 1905 max_pages = READ_ONCE(max_svm_range_pages); 1906 _pages = min_not_zero(max_pages, pages); 1907 } while (cmpxchg(&max_svm_range_pages, max_pages, _pages) != max_pages); 1908 } 1909 1910 static int 1911 svm_range_split_new(struct svm_range_list *svms, uint64_t start, uint64_t last, 1912 uint64_t max_pages, struct list_head *insert_list, 1913 struct list_head *update_list) 1914 { 1915 struct svm_range *prange; 1916 uint64_t l; 1917 1918 pr_debug("max_svm_range_pages 0x%llx adding [0x%llx 0x%llx]\n", 1919 max_pages, start, last); 1920 1921 while (last >= start) { 1922 l = min(last, ALIGN_DOWN(start + max_pages, max_pages) - 1); 1923 1924 prange = svm_range_new(svms, start, l, true); 1925 if (!prange) 1926 return -ENOMEM; 1927 list_add(&prange->list, insert_list); 1928 list_add(&prange->update_list, update_list); 1929 1930 start = l + 1; 1931 } 1932 return 0; 1933 } 1934 1935 /** 1936 * svm_range_add - add svm range and handle overlap 1937 * @p: the range add to this process svms 1938 * @start: page size aligned 1939 * @size: page size aligned 1940 * @nattr: number of attributes 1941 * @attrs: array of attributes 1942 * @update_list: output, the ranges need validate and update GPU mapping 1943 * @insert_list: output, the ranges need insert to svms 1944 * @remove_list: output, the ranges are replaced and need remove from svms 1945 * 1946 * Check if the virtual address range has overlap with any existing ranges, 1947 * split partly overlapping ranges and add new ranges in the gaps. All changes 1948 * should be applied to the range_list and interval tree transactionally. If 1949 * any range split or allocation fails, the entire update fails. Therefore any 1950 * existing overlapping svm_ranges are cloned and the original svm_ranges left 1951 * unchanged. 1952 * 1953 * If the transaction succeeds, the caller can update and insert clones and 1954 * new ranges, then free the originals. 1955 * 1956 * Otherwise the caller can free the clones and new ranges, while the old 1957 * svm_ranges remain unchanged. 1958 * 1959 * Context: Process context, caller must hold svms->lock 1960 * 1961 * Return: 1962 * 0 - OK, otherwise error code 1963 */ 1964 static int 1965 svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size, 1966 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs, 1967 struct list_head *update_list, struct list_head *insert_list, 1968 struct list_head *remove_list) 1969 { 1970 unsigned long last = start + size - 1UL; 1971 struct svm_range_list *svms = &p->svms; 1972 struct interval_tree_node *node; 1973 struct svm_range *prange; 1974 struct svm_range *tmp; 1975 struct list_head new_list; 1976 int r = 0; 1977 1978 pr_debug("svms 0x%p [0x%llx 0x%lx]\n", &p->svms, start, last); 1979 1980 INIT_LIST_HEAD(update_list); 1981 INIT_LIST_HEAD(insert_list); 1982 INIT_LIST_HEAD(remove_list); 1983 INIT_LIST_HEAD(&new_list); 1984 1985 node = interval_tree_iter_first(&svms->objects, start, last); 1986 while (node) { 1987 struct interval_tree_node *next; 1988 unsigned long next_start; 1989 1990 pr_debug("found overlap node [0x%lx 0x%lx]\n", node->start, 1991 node->last); 1992 1993 prange = container_of(node, struct svm_range, it_node); 1994 next = interval_tree_iter_next(node, start, last); 1995 next_start = min(node->last, last) + 1; 1996 1997 if (svm_range_is_same_attrs(p, prange, nattr, attrs)) { 1998 /* nothing to do */ 1999 } else if (node->start < start || node->last > last) { 2000 /* node intersects the update range and its attributes 2001 * will change. Clone and split it, apply updates only 2002 * to the overlapping part 2003 */ 2004 struct svm_range *old = prange; 2005 2006 prange = svm_range_clone(old); 2007 if (!prange) { 2008 r = -ENOMEM; 2009 goto out; 2010 } 2011 2012 list_add(&old->update_list, remove_list); 2013 list_add(&prange->list, insert_list); 2014 list_add(&prange->update_list, update_list); 2015 2016 if (node->start < start) { 2017 pr_debug("change old range start\n"); 2018 r = svm_range_split_head(prange, start, 2019 insert_list); 2020 if (r) 2021 goto out; 2022 } 2023 if (node->last > last) { 2024 pr_debug("change old range last\n"); 2025 r = svm_range_split_tail(prange, last, 2026 insert_list); 2027 if (r) 2028 goto out; 2029 } 2030 } else { 2031 /* The node is contained within start..last, 2032 * just update it 2033 */ 2034 list_add(&prange->update_list, update_list); 2035 } 2036 2037 /* insert a new node if needed */ 2038 if (node->start > start) { 2039 r = svm_range_split_new(svms, start, node->start - 1, 2040 READ_ONCE(max_svm_range_pages), 2041 &new_list, update_list); 2042 if (r) 2043 goto out; 2044 } 2045 2046 node = next; 2047 start = next_start; 2048 } 2049 2050 /* add a final range at the end if needed */ 2051 if (start <= last) 2052 r = svm_range_split_new(svms, start, last, 2053 READ_ONCE(max_svm_range_pages), 2054 &new_list, update_list); 2055 2056 out: 2057 if (r) { 2058 list_for_each_entry_safe(prange, tmp, insert_list, list) 2059 svm_range_free(prange, false); 2060 list_for_each_entry_safe(prange, tmp, &new_list, list) 2061 svm_range_free(prange, true); 2062 } else { 2063 list_splice(&new_list, insert_list); 2064 } 2065 2066 return r; 2067 } 2068 2069 static void 2070 svm_range_update_notifier_and_interval_tree(struct mm_struct *mm, 2071 struct svm_range *prange) 2072 { 2073 unsigned long start; 2074 unsigned long last; 2075 2076 start = prange->notifier.interval_tree.start >> PAGE_SHIFT; 2077 last = prange->notifier.interval_tree.last >> PAGE_SHIFT; 2078 2079 if (prange->start == start && prange->last == last) 2080 return; 2081 2082 pr_debug("up notifier 0x%p prange 0x%p [0x%lx 0x%lx] [0x%lx 0x%lx]\n", 2083 prange->svms, prange, start, last, prange->start, 2084 prange->last); 2085 2086 if (start != 0 && last != 0) { 2087 interval_tree_remove(&prange->it_node, &prange->svms->objects); 2088 svm_range_remove_notifier(prange); 2089 } 2090 prange->it_node.start = prange->start; 2091 prange->it_node.last = prange->last; 2092 2093 interval_tree_insert(&prange->it_node, &prange->svms->objects); 2094 svm_range_add_notifier_locked(mm, prange); 2095 } 2096 2097 static void 2098 svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange, 2099 struct mm_struct *mm) 2100 { 2101 switch (prange->work_item.op) { 2102 case SVM_OP_NULL: 2103 pr_debug("NULL OP 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2104 svms, prange, prange->start, prange->last); 2105 break; 2106 case SVM_OP_UNMAP_RANGE: 2107 pr_debug("remove 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2108 svms, prange, prange->start, prange->last); 2109 svm_range_unlink(prange); 2110 svm_range_remove_notifier(prange); 2111 svm_range_free(prange, true); 2112 break; 2113 case SVM_OP_UPDATE_RANGE_NOTIFIER: 2114 pr_debug("update notifier 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2115 svms, prange, prange->start, prange->last); 2116 svm_range_update_notifier_and_interval_tree(mm, prange); 2117 break; 2118 case SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP: 2119 pr_debug("update and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2120 svms, prange, prange->start, prange->last); 2121 svm_range_update_notifier_and_interval_tree(mm, prange); 2122 /* TODO: implement deferred validation and mapping */ 2123 break; 2124 case SVM_OP_ADD_RANGE: 2125 pr_debug("add 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, prange, 2126 prange->start, prange->last); 2127 svm_range_add_to_svms(prange); 2128 svm_range_add_notifier_locked(mm, prange); 2129 break; 2130 case SVM_OP_ADD_RANGE_AND_MAP: 2131 pr_debug("add and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, 2132 prange, prange->start, prange->last); 2133 svm_range_add_to_svms(prange); 2134 svm_range_add_notifier_locked(mm, prange); 2135 /* TODO: implement deferred validation and mapping */ 2136 break; 2137 default: 2138 WARN_ONCE(1, "Unknown prange 0x%p work op %d\n", prange, 2139 prange->work_item.op); 2140 } 2141 } 2142 2143 static void svm_range_drain_retry_fault(struct svm_range_list *svms) 2144 { 2145 struct kfd_process_device *pdd; 2146 struct kfd_process *p; 2147 int drain; 2148 uint32_t i; 2149 2150 p = container_of(svms, struct kfd_process, svms); 2151 2152 restart: 2153 drain = atomic_read(&svms->drain_pagefaults); 2154 if (!drain) 2155 return; 2156 2157 for_each_set_bit(i, svms->bitmap_supported, p->n_pdds) { 2158 pdd = p->pdds[i]; 2159 if (!pdd) 2160 continue; 2161 2162 pr_debug("drain retry fault gpu %d svms %p\n", i, svms); 2163 2164 amdgpu_ih_wait_on_checkpoint_process_ts(pdd->dev->adev, 2165 &pdd->dev->adev->irq.ih1); 2166 pr_debug("drain retry fault gpu %d svms 0x%p done\n", i, svms); 2167 } 2168 if (atomic_cmpxchg(&svms->drain_pagefaults, drain, 0) != drain) 2169 goto restart; 2170 } 2171 2172 static void svm_range_deferred_list_work(struct work_struct *work) 2173 { 2174 struct svm_range_list *svms; 2175 struct svm_range *prange; 2176 struct mm_struct *mm; 2177 2178 svms = container_of(work, struct svm_range_list, deferred_list_work); 2179 pr_debug("enter svms 0x%p\n", svms); 2180 2181 spin_lock(&svms->deferred_list_lock); 2182 while (!list_empty(&svms->deferred_range_list)) { 2183 prange = list_first_entry(&svms->deferred_range_list, 2184 struct svm_range, deferred_list); 2185 spin_unlock(&svms->deferred_list_lock); 2186 2187 pr_debug("prange 0x%p [0x%lx 0x%lx] op %d\n", prange, 2188 prange->start, prange->last, prange->work_item.op); 2189 2190 mm = prange->work_item.mm; 2191 retry: 2192 mmap_write_lock(mm); 2193 2194 /* Checking for the need to drain retry faults must be inside 2195 * mmap write lock to serialize with munmap notifiers. 2196 */ 2197 if (unlikely(atomic_read(&svms->drain_pagefaults))) { 2198 mmap_write_unlock(mm); 2199 svm_range_drain_retry_fault(svms); 2200 goto retry; 2201 } 2202 2203 /* Remove from deferred_list must be inside mmap write lock, for 2204 * two race cases: 2205 * 1. unmap_from_cpu may change work_item.op and add the range 2206 * to deferred_list again, cause use after free bug. 2207 * 2. svm_range_list_lock_and_flush_work may hold mmap write 2208 * lock and continue because deferred_list is empty, but 2209 * deferred_list work is actually waiting for mmap lock. 2210 */ 2211 spin_lock(&svms->deferred_list_lock); 2212 list_del_init(&prange->deferred_list); 2213 spin_unlock(&svms->deferred_list_lock); 2214 2215 mutex_lock(&svms->lock); 2216 mutex_lock(&prange->migrate_mutex); 2217 while (!list_empty(&prange->child_list)) { 2218 struct svm_range *pchild; 2219 2220 pchild = list_first_entry(&prange->child_list, 2221 struct svm_range, child_list); 2222 pr_debug("child prange 0x%p op %d\n", pchild, 2223 pchild->work_item.op); 2224 list_del_init(&pchild->child_list); 2225 svm_range_handle_list_op(svms, pchild, mm); 2226 } 2227 mutex_unlock(&prange->migrate_mutex); 2228 2229 svm_range_handle_list_op(svms, prange, mm); 2230 mutex_unlock(&svms->lock); 2231 mmap_write_unlock(mm); 2232 2233 /* Pairs with mmget in svm_range_add_list_work */ 2234 mmput(mm); 2235 2236 spin_lock(&svms->deferred_list_lock); 2237 } 2238 spin_unlock(&svms->deferred_list_lock); 2239 pr_debug("exit svms 0x%p\n", svms); 2240 } 2241 2242 void 2243 svm_range_add_list_work(struct svm_range_list *svms, struct svm_range *prange, 2244 struct mm_struct *mm, enum svm_work_list_ops op) 2245 { 2246 spin_lock(&svms->deferred_list_lock); 2247 /* if prange is on the deferred list */ 2248 if (!list_empty(&prange->deferred_list)) { 2249 pr_debug("update exist prange 0x%p work op %d\n", prange, op); 2250 WARN_ONCE(prange->work_item.mm != mm, "unmatch mm\n"); 2251 if (op != SVM_OP_NULL && 2252 prange->work_item.op != SVM_OP_UNMAP_RANGE) 2253 prange->work_item.op = op; 2254 } else { 2255 prange->work_item.op = op; 2256 2257 /* Pairs with mmput in deferred_list_work */ 2258 mmget(mm); 2259 prange->work_item.mm = mm; 2260 list_add_tail(&prange->deferred_list, 2261 &prange->svms->deferred_range_list); 2262 pr_debug("add prange 0x%p [0x%lx 0x%lx] to work list op %d\n", 2263 prange, prange->start, prange->last, op); 2264 } 2265 spin_unlock(&svms->deferred_list_lock); 2266 } 2267 2268 void schedule_deferred_list_work(struct svm_range_list *svms) 2269 { 2270 spin_lock(&svms->deferred_list_lock); 2271 if (!list_empty(&svms->deferred_range_list)) 2272 schedule_work(&svms->deferred_list_work); 2273 spin_unlock(&svms->deferred_list_lock); 2274 } 2275 2276 static void 2277 svm_range_unmap_split(struct mm_struct *mm, struct svm_range *parent, 2278 struct svm_range *prange, unsigned long start, 2279 unsigned long last) 2280 { 2281 struct svm_range *head; 2282 struct svm_range *tail; 2283 2284 if (prange->work_item.op == SVM_OP_UNMAP_RANGE) { 2285 pr_debug("prange 0x%p [0x%lx 0x%lx] is already freed\n", prange, 2286 prange->start, prange->last); 2287 return; 2288 } 2289 if (start > prange->last || last < prange->start) 2290 return; 2291 2292 head = tail = prange; 2293 if (start > prange->start) 2294 svm_range_split(prange, prange->start, start - 1, &tail); 2295 if (last < tail->last) 2296 svm_range_split(tail, last + 1, tail->last, &head); 2297 2298 if (head != prange && tail != prange) { 2299 svm_range_add_child(parent, mm, head, SVM_OP_UNMAP_RANGE); 2300 svm_range_add_child(parent, mm, tail, SVM_OP_ADD_RANGE); 2301 } else if (tail != prange) { 2302 svm_range_add_child(parent, mm, tail, SVM_OP_UNMAP_RANGE); 2303 } else if (head != prange) { 2304 svm_range_add_child(parent, mm, head, SVM_OP_UNMAP_RANGE); 2305 } else if (parent != prange) { 2306 prange->work_item.op = SVM_OP_UNMAP_RANGE; 2307 } 2308 } 2309 2310 static void 2311 svm_range_unmap_from_cpu(struct mm_struct *mm, struct svm_range *prange, 2312 unsigned long start, unsigned long last) 2313 { 2314 uint32_t trigger = KFD_SVM_UNMAP_TRIGGER_UNMAP_FROM_CPU; 2315 struct svm_range_list *svms; 2316 struct svm_range *pchild; 2317 struct kfd_process *p; 2318 unsigned long s, l; 2319 bool unmap_parent; 2320 2321 p = kfd_lookup_process_by_mm(mm); 2322 if (!p) 2323 return; 2324 svms = &p->svms; 2325 2326 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] [0x%lx 0x%lx]\n", svms, 2327 prange, prange->start, prange->last, start, last); 2328 2329 /* Make sure pending page faults are drained in the deferred worker 2330 * before the range is freed to avoid straggler interrupts on 2331 * unmapped memory causing "phantom faults". 2332 */ 2333 atomic_inc(&svms->drain_pagefaults); 2334 2335 unmap_parent = start <= prange->start && last >= prange->last; 2336 2337 list_for_each_entry(pchild, &prange->child_list, child_list) { 2338 mutex_lock_nested(&pchild->lock, 1); 2339 s = max(start, pchild->start); 2340 l = min(last, pchild->last); 2341 if (l >= s) 2342 svm_range_unmap_from_gpus(pchild, s, l, trigger); 2343 svm_range_unmap_split(mm, prange, pchild, start, last); 2344 mutex_unlock(&pchild->lock); 2345 } 2346 s = max(start, prange->start); 2347 l = min(last, prange->last); 2348 if (l >= s) 2349 svm_range_unmap_from_gpus(prange, s, l, trigger); 2350 svm_range_unmap_split(mm, prange, prange, start, last); 2351 2352 if (unmap_parent) 2353 svm_range_add_list_work(svms, prange, mm, SVM_OP_UNMAP_RANGE); 2354 else 2355 svm_range_add_list_work(svms, prange, mm, 2356 SVM_OP_UPDATE_RANGE_NOTIFIER); 2357 schedule_deferred_list_work(svms); 2358 2359 kfd_unref_process(p); 2360 } 2361 2362 /** 2363 * svm_range_cpu_invalidate_pagetables - interval notifier callback 2364 * @mni: mmu_interval_notifier struct 2365 * @range: mmu_notifier_range struct 2366 * @cur_seq: value to pass to mmu_interval_set_seq() 2367 * 2368 * If event is MMU_NOTIFY_UNMAP, this is from CPU unmap range, otherwise, it 2369 * is from migration, or CPU page invalidation callback. 2370 * 2371 * For unmap event, unmap range from GPUs, remove prange from svms in a delayed 2372 * work thread, and split prange if only part of prange is unmapped. 2373 * 2374 * For invalidation event, if GPU retry fault is not enabled, evict the queues, 2375 * then schedule svm_range_restore_work to update GPU mapping and resume queues. 2376 * If GPU retry fault is enabled, unmap the svm range from GPU, retry fault will 2377 * update GPU mapping to recover. 2378 * 2379 * Context: mmap lock, notifier_invalidate_start lock are held 2380 * for invalidate event, prange lock is held if this is from migration 2381 */ 2382 static bool 2383 svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, 2384 const struct mmu_notifier_range *range, 2385 unsigned long cur_seq) 2386 { 2387 struct svm_range *prange; 2388 unsigned long start; 2389 unsigned long last; 2390 2391 if (range->event == MMU_NOTIFY_RELEASE) 2392 return true; 2393 if (!mmget_not_zero(mni->mm)) 2394 return true; 2395 2396 start = mni->interval_tree.start; 2397 last = mni->interval_tree.last; 2398 start = max(start, range->start) >> PAGE_SHIFT; 2399 last = min(last, range->end - 1) >> PAGE_SHIFT; 2400 pr_debug("[0x%lx 0x%lx] range[0x%lx 0x%lx] notifier[0x%lx 0x%lx] %d\n", 2401 start, last, range->start >> PAGE_SHIFT, 2402 (range->end - 1) >> PAGE_SHIFT, 2403 mni->interval_tree.start >> PAGE_SHIFT, 2404 mni->interval_tree.last >> PAGE_SHIFT, range->event); 2405 2406 prange = container_of(mni, struct svm_range, notifier); 2407 2408 svm_range_lock(prange); 2409 mmu_interval_set_seq(mni, cur_seq); 2410 2411 switch (range->event) { 2412 case MMU_NOTIFY_UNMAP: 2413 svm_range_unmap_from_cpu(mni->mm, prange, start, last); 2414 break; 2415 default: 2416 svm_range_evict(prange, mni->mm, start, last, range->event); 2417 break; 2418 } 2419 2420 svm_range_unlock(prange); 2421 mmput(mni->mm); 2422 2423 return true; 2424 } 2425 2426 /** 2427 * svm_range_from_addr - find svm range from fault address 2428 * @svms: svm range list header 2429 * @addr: address to search range interval tree, in pages 2430 * @parent: parent range if range is on child list 2431 * 2432 * Context: The caller must hold svms->lock 2433 * 2434 * Return: the svm_range found or NULL 2435 */ 2436 struct svm_range * 2437 svm_range_from_addr(struct svm_range_list *svms, unsigned long addr, 2438 struct svm_range **parent) 2439 { 2440 struct interval_tree_node *node; 2441 struct svm_range *prange; 2442 struct svm_range *pchild; 2443 2444 node = interval_tree_iter_first(&svms->objects, addr, addr); 2445 if (!node) 2446 return NULL; 2447 2448 prange = container_of(node, struct svm_range, it_node); 2449 pr_debug("address 0x%lx prange [0x%lx 0x%lx] node [0x%lx 0x%lx]\n", 2450 addr, prange->start, prange->last, node->start, node->last); 2451 2452 if (addr >= prange->start && addr <= prange->last) { 2453 if (parent) 2454 *parent = prange; 2455 return prange; 2456 } 2457 list_for_each_entry(pchild, &prange->child_list, child_list) 2458 if (addr >= pchild->start && addr <= pchild->last) { 2459 pr_debug("found address 0x%lx pchild [0x%lx 0x%lx]\n", 2460 addr, pchild->start, pchild->last); 2461 if (parent) 2462 *parent = prange; 2463 return pchild; 2464 } 2465 2466 return NULL; 2467 } 2468 2469 /* svm_range_best_restore_location - decide the best fault restore location 2470 * @prange: svm range structure 2471 * @adev: the GPU on which vm fault happened 2472 * 2473 * This is only called when xnack is on, to decide the best location to restore 2474 * the range mapping after GPU vm fault. Caller uses the best location to do 2475 * migration if actual loc is not best location, then update GPU page table 2476 * mapping to the best location. 2477 * 2478 * If the preferred loc is accessible by faulting GPU, use preferred loc. 2479 * If vm fault gpu idx is on range ACCESSIBLE bitmap, best_loc is vm fault gpu 2480 * If vm fault gpu idx is on range ACCESSIBLE_IN_PLACE bitmap, then 2481 * if range actual loc is cpu, best_loc is cpu 2482 * if vm fault gpu is on xgmi same hive of range actual loc gpu, best_loc is 2483 * range actual loc. 2484 * Otherwise, GPU no access, best_loc is -1. 2485 * 2486 * Return: 2487 * -1 means vm fault GPU no access 2488 * 0 for CPU or GPU id 2489 */ 2490 static int32_t 2491 svm_range_best_restore_location(struct svm_range *prange, 2492 struct amdgpu_device *adev, 2493 int32_t *gpuidx) 2494 { 2495 struct amdgpu_device *bo_adev, *preferred_adev; 2496 struct kfd_process *p; 2497 uint32_t gpuid; 2498 int r; 2499 2500 p = container_of(prange->svms, struct kfd_process, svms); 2501 2502 r = kfd_process_gpuid_from_adev(p, adev, &gpuid, gpuidx); 2503 if (r < 0) { 2504 pr_debug("failed to get gpuid from kgd\n"); 2505 return -1; 2506 } 2507 2508 if (prange->preferred_loc == gpuid || 2509 prange->preferred_loc == KFD_IOCTL_SVM_LOCATION_SYSMEM) { 2510 return prange->preferred_loc; 2511 } else if (prange->preferred_loc != KFD_IOCTL_SVM_LOCATION_UNDEFINED) { 2512 preferred_adev = svm_range_get_adev_by_id(prange, 2513 prange->preferred_loc); 2514 if (amdgpu_xgmi_same_hive(adev, preferred_adev)) 2515 return prange->preferred_loc; 2516 /* fall through */ 2517 } 2518 2519 if (test_bit(*gpuidx, prange->bitmap_access)) 2520 return gpuid; 2521 2522 if (test_bit(*gpuidx, prange->bitmap_aip)) { 2523 if (!prange->actual_loc) 2524 return 0; 2525 2526 bo_adev = svm_range_get_adev_by_id(prange, prange->actual_loc); 2527 if (amdgpu_xgmi_same_hive(adev, bo_adev)) 2528 return prange->actual_loc; 2529 else 2530 return 0; 2531 } 2532 2533 return -1; 2534 } 2535 2536 static int 2537 svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr, 2538 unsigned long *start, unsigned long *last, 2539 bool *is_heap_stack) 2540 { 2541 struct vm_area_struct *vma; 2542 struct interval_tree_node *node; 2543 unsigned long start_limit, end_limit; 2544 2545 vma = find_vma(p->mm, addr << PAGE_SHIFT); 2546 if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) { 2547 pr_debug("VMA does not exist in address [0x%llx]\n", addr); 2548 return -EFAULT; 2549 } 2550 2551 *is_heap_stack = (vma->vm_start <= vma->vm_mm->brk && 2552 vma->vm_end >= vma->vm_mm->start_brk) || 2553 (vma->vm_start <= vma->vm_mm->start_stack && 2554 vma->vm_end >= vma->vm_mm->start_stack); 2555 2556 start_limit = max(vma->vm_start >> PAGE_SHIFT, 2557 (unsigned long)ALIGN_DOWN(addr, 2UL << 8)); 2558 end_limit = min(vma->vm_end >> PAGE_SHIFT, 2559 (unsigned long)ALIGN(addr + 1, 2UL << 8)); 2560 /* First range that starts after the fault address */ 2561 node = interval_tree_iter_first(&p->svms.objects, addr + 1, ULONG_MAX); 2562 if (node) { 2563 end_limit = min(end_limit, node->start); 2564 /* Last range that ends before the fault address */ 2565 node = container_of(rb_prev(&node->rb), 2566 struct interval_tree_node, rb); 2567 } else { 2568 /* Last range must end before addr because 2569 * there was no range after addr 2570 */ 2571 node = container_of(rb_last(&p->svms.objects.rb_root), 2572 struct interval_tree_node, rb); 2573 } 2574 if (node) { 2575 if (node->last >= addr) { 2576 WARN(1, "Overlap with prev node and page fault addr\n"); 2577 return -EFAULT; 2578 } 2579 start_limit = max(start_limit, node->last + 1); 2580 } 2581 2582 *start = start_limit; 2583 *last = end_limit - 1; 2584 2585 pr_debug("vma [0x%lx 0x%lx] range [0x%lx 0x%lx] is_heap_stack %d\n", 2586 vma->vm_start >> PAGE_SHIFT, vma->vm_end >> PAGE_SHIFT, 2587 *start, *last, *is_heap_stack); 2588 2589 return 0; 2590 } 2591 2592 static int 2593 svm_range_check_vm_userptr(struct kfd_process *p, uint64_t start, uint64_t last, 2594 uint64_t *bo_s, uint64_t *bo_l) 2595 { 2596 struct amdgpu_bo_va_mapping *mapping; 2597 struct interval_tree_node *node; 2598 struct amdgpu_bo *bo = NULL; 2599 unsigned long userptr; 2600 uint32_t i; 2601 int r; 2602 2603 for (i = 0; i < p->n_pdds; i++) { 2604 struct amdgpu_vm *vm; 2605 2606 if (!p->pdds[i]->drm_priv) 2607 continue; 2608 2609 vm = drm_priv_to_vm(p->pdds[i]->drm_priv); 2610 r = amdgpu_bo_reserve(vm->root.bo, false); 2611 if (r) 2612 return r; 2613 2614 /* Check userptr by searching entire vm->va interval tree */ 2615 node = interval_tree_iter_first(&vm->va, 0, ~0ULL); 2616 while (node) { 2617 mapping = container_of((struct rb_node *)node, 2618 struct amdgpu_bo_va_mapping, rb); 2619 bo = mapping->bo_va->base.bo; 2620 2621 if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, 2622 start << PAGE_SHIFT, 2623 last << PAGE_SHIFT, 2624 &userptr)) { 2625 node = interval_tree_iter_next(node, 0, ~0ULL); 2626 continue; 2627 } 2628 2629 pr_debug("[0x%llx 0x%llx] already userptr mapped\n", 2630 start, last); 2631 if (bo_s && bo_l) { 2632 *bo_s = userptr >> PAGE_SHIFT; 2633 *bo_l = *bo_s + bo->tbo.ttm->num_pages - 1; 2634 } 2635 amdgpu_bo_unreserve(vm->root.bo); 2636 return -EADDRINUSE; 2637 } 2638 amdgpu_bo_unreserve(vm->root.bo); 2639 } 2640 return 0; 2641 } 2642 2643 static struct 2644 svm_range *svm_range_create_unregistered_range(struct amdgpu_device *adev, 2645 struct kfd_process *p, 2646 struct mm_struct *mm, 2647 int64_t addr) 2648 { 2649 struct svm_range *prange = NULL; 2650 unsigned long start, last; 2651 uint32_t gpuid, gpuidx; 2652 bool is_heap_stack; 2653 uint64_t bo_s = 0; 2654 uint64_t bo_l = 0; 2655 int r; 2656 2657 if (svm_range_get_range_boundaries(p, addr, &start, &last, 2658 &is_heap_stack)) 2659 return NULL; 2660 2661 r = svm_range_check_vm(p, start, last, &bo_s, &bo_l); 2662 if (r != -EADDRINUSE) 2663 r = svm_range_check_vm_userptr(p, start, last, &bo_s, &bo_l); 2664 2665 if (r == -EADDRINUSE) { 2666 if (addr >= bo_s && addr <= bo_l) 2667 return NULL; 2668 2669 /* Create one page svm range if 2MB range overlapping */ 2670 start = addr; 2671 last = addr; 2672 } 2673 2674 prange = svm_range_new(&p->svms, start, last, true); 2675 if (!prange) { 2676 pr_debug("Failed to create prange in address [0x%llx]\n", addr); 2677 return NULL; 2678 } 2679 if (kfd_process_gpuid_from_adev(p, adev, &gpuid, &gpuidx)) { 2680 pr_debug("failed to get gpuid from kgd\n"); 2681 svm_range_free(prange, true); 2682 return NULL; 2683 } 2684 2685 if (is_heap_stack) 2686 prange->preferred_loc = KFD_IOCTL_SVM_LOCATION_SYSMEM; 2687 2688 svm_range_add_to_svms(prange); 2689 svm_range_add_notifier_locked(mm, prange); 2690 2691 return prange; 2692 } 2693 2694 /* svm_range_skip_recover - decide if prange can be recovered 2695 * @prange: svm range structure 2696 * 2697 * GPU vm retry fault handle skip recover the range for cases: 2698 * 1. prange is on deferred list to be removed after unmap, it is stale fault, 2699 * deferred list work will drain the stale fault before free the prange. 2700 * 2. prange is on deferred list to add interval notifier after split, or 2701 * 3. prange is child range, it is split from parent prange, recover later 2702 * after interval notifier is added. 2703 * 2704 * Return: true to skip recover, false to recover 2705 */ 2706 static bool svm_range_skip_recover(struct svm_range *prange) 2707 { 2708 struct svm_range_list *svms = prange->svms; 2709 2710 spin_lock(&svms->deferred_list_lock); 2711 if (list_empty(&prange->deferred_list) && 2712 list_empty(&prange->child_list)) { 2713 spin_unlock(&svms->deferred_list_lock); 2714 return false; 2715 } 2716 spin_unlock(&svms->deferred_list_lock); 2717 2718 if (prange->work_item.op == SVM_OP_UNMAP_RANGE) { 2719 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] unmapped\n", 2720 svms, prange, prange->start, prange->last); 2721 return true; 2722 } 2723 if (prange->work_item.op == SVM_OP_ADD_RANGE_AND_MAP || 2724 prange->work_item.op == SVM_OP_ADD_RANGE) { 2725 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] not added yet\n", 2726 svms, prange, prange->start, prange->last); 2727 return true; 2728 } 2729 return false; 2730 } 2731 2732 static void 2733 svm_range_count_fault(struct amdgpu_device *adev, struct kfd_process *p, 2734 int32_t gpuidx) 2735 { 2736 struct kfd_process_device *pdd; 2737 2738 /* fault is on different page of same range 2739 * or fault is skipped to recover later 2740 * or fault is on invalid virtual address 2741 */ 2742 if (gpuidx == MAX_GPU_INSTANCE) { 2743 uint32_t gpuid; 2744 int r; 2745 2746 r = kfd_process_gpuid_from_adev(p, adev, &gpuid, &gpuidx); 2747 if (r < 0) 2748 return; 2749 } 2750 2751 /* fault is recovered 2752 * or fault cannot recover because GPU no access on the range 2753 */ 2754 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 2755 if (pdd) 2756 WRITE_ONCE(pdd->faults, pdd->faults + 1); 2757 } 2758 2759 static bool 2760 svm_fault_allowed(struct vm_area_struct *vma, bool write_fault) 2761 { 2762 unsigned long requested = VM_READ; 2763 2764 if (write_fault) 2765 requested |= VM_WRITE; 2766 2767 pr_debug("requested 0x%lx, vma permission flags 0x%lx\n", requested, 2768 vma->vm_flags); 2769 return (vma->vm_flags & requested) == requested; 2770 } 2771 2772 int 2773 svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid, 2774 uint64_t addr, bool write_fault) 2775 { 2776 struct mm_struct *mm = NULL; 2777 struct svm_range_list *svms; 2778 struct svm_range *prange; 2779 struct kfd_process *p; 2780 ktime_t timestamp = ktime_get_boottime(); 2781 int32_t best_loc; 2782 int32_t gpuidx = MAX_GPU_INSTANCE; 2783 bool write_locked = false; 2784 struct vm_area_struct *vma; 2785 bool migration = false; 2786 int r = 0; 2787 2788 if (!KFD_IS_SVM_API_SUPPORTED(adev->kfd.dev)) { 2789 pr_debug("device does not support SVM\n"); 2790 return -EFAULT; 2791 } 2792 2793 p = kfd_lookup_process_by_pasid(pasid); 2794 if (!p) { 2795 pr_debug("kfd process not founded pasid 0x%x\n", pasid); 2796 return 0; 2797 } 2798 svms = &p->svms; 2799 2800 pr_debug("restoring svms 0x%p fault address 0x%llx\n", svms, addr); 2801 2802 if (atomic_read(&svms->drain_pagefaults)) { 2803 pr_debug("draining retry fault, drop fault 0x%llx\n", addr); 2804 r = 0; 2805 goto out; 2806 } 2807 2808 if (!p->xnack_enabled) { 2809 pr_debug("XNACK not enabled for pasid 0x%x\n", pasid); 2810 r = -EFAULT; 2811 goto out; 2812 } 2813 2814 /* p->lead_thread is available as kfd_process_wq_release flush the work 2815 * before releasing task ref. 2816 */ 2817 mm = get_task_mm(p->lead_thread); 2818 if (!mm) { 2819 pr_debug("svms 0x%p failed to get mm\n", svms); 2820 r = 0; 2821 goto out; 2822 } 2823 2824 mmap_read_lock(mm); 2825 retry_write_locked: 2826 mutex_lock(&svms->lock); 2827 prange = svm_range_from_addr(svms, addr, NULL); 2828 if (!prange) { 2829 pr_debug("failed to find prange svms 0x%p address [0x%llx]\n", 2830 svms, addr); 2831 if (!write_locked) { 2832 /* Need the write lock to create new range with MMU notifier. 2833 * Also flush pending deferred work to make sure the interval 2834 * tree is up to date before we add a new range 2835 */ 2836 mutex_unlock(&svms->lock); 2837 mmap_read_unlock(mm); 2838 mmap_write_lock(mm); 2839 write_locked = true; 2840 goto retry_write_locked; 2841 } 2842 prange = svm_range_create_unregistered_range(adev, p, mm, addr); 2843 if (!prange) { 2844 pr_debug("failed to create unregistered range svms 0x%p address [0x%llx]\n", 2845 svms, addr); 2846 mmap_write_downgrade(mm); 2847 r = -EFAULT; 2848 goto out_unlock_svms; 2849 } 2850 } 2851 if (write_locked) 2852 mmap_write_downgrade(mm); 2853 2854 mutex_lock(&prange->migrate_mutex); 2855 2856 if (svm_range_skip_recover(prange)) { 2857 amdgpu_gmc_filter_faults_remove(adev, addr, pasid); 2858 r = 0; 2859 goto out_unlock_range; 2860 } 2861 2862 /* skip duplicate vm fault on different pages of same range */ 2863 if (ktime_before(timestamp, ktime_add_ns(prange->validate_timestamp, 2864 AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING))) { 2865 pr_debug("svms 0x%p [0x%lx %lx] already restored\n", 2866 svms, prange->start, prange->last); 2867 r = 0; 2868 goto out_unlock_range; 2869 } 2870 2871 /* __do_munmap removed VMA, return success as we are handling stale 2872 * retry fault. 2873 */ 2874 vma = find_vma(mm, addr << PAGE_SHIFT); 2875 if (!vma || (addr << PAGE_SHIFT) < vma->vm_start) { 2876 pr_debug("address 0x%llx VMA is removed\n", addr); 2877 r = 0; 2878 goto out_unlock_range; 2879 } 2880 2881 if (!svm_fault_allowed(vma, write_fault)) { 2882 pr_debug("fault addr 0x%llx no %s permission\n", addr, 2883 write_fault ? "write" : "read"); 2884 r = -EPERM; 2885 goto out_unlock_range; 2886 } 2887 2888 best_loc = svm_range_best_restore_location(prange, adev, &gpuidx); 2889 if (best_loc == -1) { 2890 pr_debug("svms %p failed get best restore loc [0x%lx 0x%lx]\n", 2891 svms, prange->start, prange->last); 2892 r = -EACCES; 2893 goto out_unlock_range; 2894 } 2895 2896 pr_debug("svms %p [0x%lx 0x%lx] best restore 0x%x, actual loc 0x%x\n", 2897 svms, prange->start, prange->last, best_loc, 2898 prange->actual_loc); 2899 2900 kfd_smi_event_page_fault_start(adev->kfd.dev, p->lead_thread->pid, addr, 2901 write_fault, timestamp); 2902 2903 if (prange->actual_loc != best_loc) { 2904 migration = true; 2905 if (best_loc) { 2906 r = svm_migrate_to_vram(prange, best_loc, mm, 2907 KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU); 2908 if (r) { 2909 pr_debug("svm_migrate_to_vram failed (%d) at %llx, falling back to system memory\n", 2910 r, addr); 2911 /* Fallback to system memory if migration to 2912 * VRAM failed 2913 */ 2914 if (prange->actual_loc) 2915 r = svm_migrate_vram_to_ram(prange, mm, 2916 KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU, 2917 NULL); 2918 else 2919 r = 0; 2920 } 2921 } else { 2922 r = svm_migrate_vram_to_ram(prange, mm, 2923 KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU, 2924 NULL); 2925 } 2926 if (r) { 2927 pr_debug("failed %d to migrate svms %p [0x%lx 0x%lx]\n", 2928 r, svms, prange->start, prange->last); 2929 goto out_unlock_range; 2930 } 2931 } 2932 2933 r = svm_range_validate_and_map(mm, prange, gpuidx, false, false, false); 2934 if (r) 2935 pr_debug("failed %d to map svms 0x%p [0x%lx 0x%lx] to gpus\n", 2936 r, svms, prange->start, prange->last); 2937 2938 kfd_smi_event_page_fault_end(adev->kfd.dev, p->lead_thread->pid, addr, 2939 migration); 2940 2941 out_unlock_range: 2942 mutex_unlock(&prange->migrate_mutex); 2943 out_unlock_svms: 2944 mutex_unlock(&svms->lock); 2945 mmap_read_unlock(mm); 2946 2947 svm_range_count_fault(adev, p, gpuidx); 2948 2949 mmput(mm); 2950 out: 2951 kfd_unref_process(p); 2952 2953 if (r == -EAGAIN) { 2954 pr_debug("recover vm fault later\n"); 2955 amdgpu_gmc_filter_faults_remove(adev, addr, pasid); 2956 r = 0; 2957 } 2958 return r; 2959 } 2960 2961 int 2962 svm_range_switch_xnack_reserve_mem(struct kfd_process *p, bool xnack_enabled) 2963 { 2964 struct svm_range *prange, *pchild; 2965 uint64_t reserved_size = 0; 2966 uint64_t size; 2967 int r = 0; 2968 2969 pr_debug("switching xnack from %d to %d\n", p->xnack_enabled, xnack_enabled); 2970 2971 mutex_lock(&p->svms.lock); 2972 2973 list_for_each_entry(prange, &p->svms.list, list) { 2974 svm_range_lock(prange); 2975 list_for_each_entry(pchild, &prange->child_list, child_list) { 2976 size = (pchild->last - pchild->start + 1) << PAGE_SHIFT; 2977 if (xnack_enabled) { 2978 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 2979 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 2980 } else { 2981 r = amdgpu_amdkfd_reserve_mem_limit(NULL, size, 2982 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 2983 if (r) 2984 goto out_unlock; 2985 reserved_size += size; 2986 } 2987 } 2988 2989 size = (prange->last - prange->start + 1) << PAGE_SHIFT; 2990 if (xnack_enabled) { 2991 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 2992 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 2993 } else { 2994 r = amdgpu_amdkfd_reserve_mem_limit(NULL, size, 2995 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 2996 if (r) 2997 goto out_unlock; 2998 reserved_size += size; 2999 } 3000 out_unlock: 3001 svm_range_unlock(prange); 3002 if (r) 3003 break; 3004 } 3005 3006 if (r) 3007 amdgpu_amdkfd_unreserve_mem_limit(NULL, reserved_size, 3008 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR); 3009 else 3010 /* Change xnack mode must be inside svms lock, to avoid race with 3011 * svm_range_deferred_list_work unreserve memory in parallel. 3012 */ 3013 p->xnack_enabled = xnack_enabled; 3014 3015 mutex_unlock(&p->svms.lock); 3016 return r; 3017 } 3018 3019 void svm_range_list_fini(struct kfd_process *p) 3020 { 3021 struct svm_range *prange; 3022 struct svm_range *next; 3023 3024 pr_debug("pasid 0x%x svms 0x%p\n", p->pasid, &p->svms); 3025 3026 cancel_delayed_work_sync(&p->svms.restore_work); 3027 3028 /* Ensure list work is finished before process is destroyed */ 3029 flush_work(&p->svms.deferred_list_work); 3030 3031 /* 3032 * Ensure no retry fault comes in afterwards, as page fault handler will 3033 * not find kfd process and take mm lock to recover fault. 3034 */ 3035 atomic_inc(&p->svms.drain_pagefaults); 3036 svm_range_drain_retry_fault(&p->svms); 3037 3038 list_for_each_entry_safe(prange, next, &p->svms.list, list) { 3039 svm_range_unlink(prange); 3040 svm_range_remove_notifier(prange); 3041 svm_range_free(prange, true); 3042 } 3043 3044 mutex_destroy(&p->svms.lock); 3045 3046 pr_debug("pasid 0x%x svms 0x%p done\n", p->pasid, &p->svms); 3047 } 3048 3049 int svm_range_list_init(struct kfd_process *p) 3050 { 3051 struct svm_range_list *svms = &p->svms; 3052 int i; 3053 3054 svms->objects = RB_ROOT_CACHED; 3055 mutex_init(&svms->lock); 3056 INIT_LIST_HEAD(&svms->list); 3057 atomic_set(&svms->evicted_ranges, 0); 3058 atomic_set(&svms->drain_pagefaults, 0); 3059 INIT_DELAYED_WORK(&svms->restore_work, svm_range_restore_work); 3060 INIT_WORK(&svms->deferred_list_work, svm_range_deferred_list_work); 3061 INIT_LIST_HEAD(&svms->deferred_range_list); 3062 INIT_LIST_HEAD(&svms->criu_svm_metadata_list); 3063 spin_lock_init(&svms->deferred_list_lock); 3064 3065 for (i = 0; i < p->n_pdds; i++) 3066 if (KFD_IS_SVM_API_SUPPORTED(p->pdds[i]->dev)) 3067 bitmap_set(svms->bitmap_supported, i, 1); 3068 3069 return 0; 3070 } 3071 3072 /** 3073 * svm_range_check_vm - check if virtual address range mapped already 3074 * @p: current kfd_process 3075 * @start: range start address, in pages 3076 * @last: range last address, in pages 3077 * @bo_s: mapping start address in pages if address range already mapped 3078 * @bo_l: mapping last address in pages if address range already mapped 3079 * 3080 * The purpose is to avoid virtual address ranges already allocated by 3081 * kfd_ioctl_alloc_memory_of_gpu ioctl. 3082 * It looks for each pdd in the kfd_process. 3083 * 3084 * Context: Process context 3085 * 3086 * Return 0 - OK, if the range is not mapped. 3087 * Otherwise error code: 3088 * -EADDRINUSE - if address is mapped already by kfd_ioctl_alloc_memory_of_gpu 3089 * -ERESTARTSYS - A wait for the buffer to become unreserved was interrupted by 3090 * a signal. Release all buffer reservations and return to user-space. 3091 */ 3092 static int 3093 svm_range_check_vm(struct kfd_process *p, uint64_t start, uint64_t last, 3094 uint64_t *bo_s, uint64_t *bo_l) 3095 { 3096 struct amdgpu_bo_va_mapping *mapping; 3097 struct interval_tree_node *node; 3098 uint32_t i; 3099 int r; 3100 3101 for (i = 0; i < p->n_pdds; i++) { 3102 struct amdgpu_vm *vm; 3103 3104 if (!p->pdds[i]->drm_priv) 3105 continue; 3106 3107 vm = drm_priv_to_vm(p->pdds[i]->drm_priv); 3108 r = amdgpu_bo_reserve(vm->root.bo, false); 3109 if (r) 3110 return r; 3111 3112 node = interval_tree_iter_first(&vm->va, start, last); 3113 if (node) { 3114 pr_debug("range [0x%llx 0x%llx] already TTM mapped\n", 3115 start, last); 3116 mapping = container_of((struct rb_node *)node, 3117 struct amdgpu_bo_va_mapping, rb); 3118 if (bo_s && bo_l) { 3119 *bo_s = mapping->start; 3120 *bo_l = mapping->last; 3121 } 3122 amdgpu_bo_unreserve(vm->root.bo); 3123 return -EADDRINUSE; 3124 } 3125 amdgpu_bo_unreserve(vm->root.bo); 3126 } 3127 3128 return 0; 3129 } 3130 3131 /** 3132 * svm_range_is_valid - check if virtual address range is valid 3133 * @p: current kfd_process 3134 * @start: range start address, in pages 3135 * @size: range size, in pages 3136 * 3137 * Valid virtual address range means it belongs to one or more VMAs 3138 * 3139 * Context: Process context 3140 * 3141 * Return: 3142 * 0 - OK, otherwise error code 3143 */ 3144 static int 3145 svm_range_is_valid(struct kfd_process *p, uint64_t start, uint64_t size) 3146 { 3147 const unsigned long device_vma = VM_IO | VM_PFNMAP | VM_MIXEDMAP; 3148 struct vm_area_struct *vma; 3149 unsigned long end; 3150 unsigned long start_unchg = start; 3151 3152 start <<= PAGE_SHIFT; 3153 end = start + (size << PAGE_SHIFT); 3154 do { 3155 vma = find_vma(p->mm, start); 3156 if (!vma || start < vma->vm_start || 3157 (vma->vm_flags & device_vma)) 3158 return -EFAULT; 3159 start = min(end, vma->vm_end); 3160 } while (start < end); 3161 3162 return svm_range_check_vm(p, start_unchg, (end - 1) >> PAGE_SHIFT, NULL, 3163 NULL); 3164 } 3165 3166 /** 3167 * svm_range_best_prefetch_location - decide the best prefetch location 3168 * @prange: svm range structure 3169 * 3170 * For xnack off: 3171 * If range map to single GPU, the best prefetch location is prefetch_loc, which 3172 * can be CPU or GPU. 3173 * 3174 * If range is ACCESS or ACCESS_IN_PLACE by mGPUs, only if mGPU connection on 3175 * XGMI same hive, the best prefetch location is prefetch_loc GPU, othervise 3176 * the best prefetch location is always CPU, because GPU can not have coherent 3177 * mapping VRAM of other GPUs even with large-BAR PCIe connection. 3178 * 3179 * For xnack on: 3180 * If range is not ACCESS_IN_PLACE by mGPUs, the best prefetch location is 3181 * prefetch_loc, other GPU access will generate vm fault and trigger migration. 3182 * 3183 * If range is ACCESS_IN_PLACE by mGPUs, only if mGPU connection on XGMI same 3184 * hive, the best prefetch location is prefetch_loc GPU, otherwise the best 3185 * prefetch location is always CPU. 3186 * 3187 * Context: Process context 3188 * 3189 * Return: 3190 * 0 for CPU or GPU id 3191 */ 3192 static uint32_t 3193 svm_range_best_prefetch_location(struct svm_range *prange) 3194 { 3195 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 3196 uint32_t best_loc = prange->prefetch_loc; 3197 struct kfd_process_device *pdd; 3198 struct amdgpu_device *bo_adev; 3199 struct kfd_process *p; 3200 uint32_t gpuidx; 3201 3202 p = container_of(prange->svms, struct kfd_process, svms); 3203 3204 if (!best_loc || best_loc == KFD_IOCTL_SVM_LOCATION_UNDEFINED) 3205 goto out; 3206 3207 bo_adev = svm_range_get_adev_by_id(prange, best_loc); 3208 if (!bo_adev) { 3209 WARN_ONCE(1, "failed to get device by id 0x%x\n", best_loc); 3210 best_loc = 0; 3211 goto out; 3212 } 3213 3214 if (p->xnack_enabled) 3215 bitmap_copy(bitmap, prange->bitmap_aip, MAX_GPU_INSTANCE); 3216 else 3217 bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip, 3218 MAX_GPU_INSTANCE); 3219 3220 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 3221 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 3222 if (!pdd) { 3223 pr_debug("failed to get device by idx 0x%x\n", gpuidx); 3224 continue; 3225 } 3226 3227 if (pdd->dev->adev == bo_adev) 3228 continue; 3229 3230 if (!amdgpu_xgmi_same_hive(pdd->dev->adev, bo_adev)) { 3231 best_loc = 0; 3232 break; 3233 } 3234 } 3235 3236 out: 3237 pr_debug("xnack %d svms 0x%p [0x%lx 0x%lx] best loc 0x%x\n", 3238 p->xnack_enabled, &p->svms, prange->start, prange->last, 3239 best_loc); 3240 3241 return best_loc; 3242 } 3243 3244 /* svm_range_trigger_migration - start page migration if prefetch loc changed 3245 * @mm: current process mm_struct 3246 * @prange: svm range structure 3247 * @migrated: output, true if migration is triggered 3248 * 3249 * If range perfetch_loc is GPU, actual loc is cpu 0, then migrate the range 3250 * from ram to vram. 3251 * If range prefetch_loc is cpu 0, actual loc is GPU, then migrate the range 3252 * from vram to ram. 3253 * 3254 * If GPU vm fault retry is not enabled, migration interact with MMU notifier 3255 * and restore work: 3256 * 1. migrate_vma_setup invalidate pages, MMU notifier callback svm_range_evict 3257 * stops all queues, schedule restore work 3258 * 2. svm_range_restore_work wait for migration is done by 3259 * a. svm_range_validate_vram takes prange->migrate_mutex 3260 * b. svm_range_validate_ram HMM get pages wait for CPU fault handle returns 3261 * 3. restore work update mappings of GPU, resume all queues. 3262 * 3263 * Context: Process context 3264 * 3265 * Return: 3266 * 0 - OK, otherwise - error code of migration 3267 */ 3268 static int 3269 svm_range_trigger_migration(struct mm_struct *mm, struct svm_range *prange, 3270 bool *migrated) 3271 { 3272 uint32_t best_loc; 3273 int r = 0; 3274 3275 *migrated = false; 3276 best_loc = svm_range_best_prefetch_location(prange); 3277 3278 if (best_loc == KFD_IOCTL_SVM_LOCATION_UNDEFINED || 3279 best_loc == prange->actual_loc) 3280 return 0; 3281 3282 if (!best_loc) { 3283 r = svm_migrate_vram_to_ram(prange, mm, 3284 KFD_MIGRATE_TRIGGER_PREFETCH, NULL); 3285 *migrated = !r; 3286 return r; 3287 } 3288 3289 r = svm_migrate_to_vram(prange, best_loc, mm, KFD_MIGRATE_TRIGGER_PREFETCH); 3290 *migrated = !r; 3291 3292 return r; 3293 } 3294 3295 int svm_range_schedule_evict_svm_bo(struct amdgpu_amdkfd_fence *fence) 3296 { 3297 if (!fence) 3298 return -EINVAL; 3299 3300 if (dma_fence_is_signaled(&fence->base)) 3301 return 0; 3302 3303 if (fence->svm_bo) { 3304 WRITE_ONCE(fence->svm_bo->evicting, 1); 3305 schedule_work(&fence->svm_bo->eviction_work); 3306 } 3307 3308 return 0; 3309 } 3310 3311 static void svm_range_evict_svm_bo_worker(struct work_struct *work) 3312 { 3313 struct svm_range_bo *svm_bo; 3314 struct mm_struct *mm; 3315 int r = 0; 3316 3317 svm_bo = container_of(work, struct svm_range_bo, eviction_work); 3318 if (!svm_bo_ref_unless_zero(svm_bo)) 3319 return; /* svm_bo was freed while eviction was pending */ 3320 3321 if (mmget_not_zero(svm_bo->eviction_fence->mm)) { 3322 mm = svm_bo->eviction_fence->mm; 3323 } else { 3324 svm_range_bo_unref(svm_bo); 3325 return; 3326 } 3327 3328 mmap_read_lock(mm); 3329 spin_lock(&svm_bo->list_lock); 3330 while (!list_empty(&svm_bo->range_list) && !r) { 3331 struct svm_range *prange = 3332 list_first_entry(&svm_bo->range_list, 3333 struct svm_range, svm_bo_list); 3334 int retries = 3; 3335 3336 list_del_init(&prange->svm_bo_list); 3337 spin_unlock(&svm_bo->list_lock); 3338 3339 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, 3340 prange->start, prange->last); 3341 3342 mutex_lock(&prange->migrate_mutex); 3343 do { 3344 r = svm_migrate_vram_to_ram(prange, mm, 3345 KFD_MIGRATE_TRIGGER_TTM_EVICTION, NULL); 3346 } while (!r && prange->actual_loc && --retries); 3347 3348 if (!r && prange->actual_loc) 3349 pr_info_once("Migration failed during eviction"); 3350 3351 if (!prange->actual_loc) { 3352 mutex_lock(&prange->lock); 3353 prange->svm_bo = NULL; 3354 mutex_unlock(&prange->lock); 3355 } 3356 mutex_unlock(&prange->migrate_mutex); 3357 3358 spin_lock(&svm_bo->list_lock); 3359 } 3360 spin_unlock(&svm_bo->list_lock); 3361 mmap_read_unlock(mm); 3362 mmput(mm); 3363 3364 dma_fence_signal(&svm_bo->eviction_fence->base); 3365 3366 /* This is the last reference to svm_bo, after svm_range_vram_node_free 3367 * has been called in svm_migrate_vram_to_ram 3368 */ 3369 WARN_ONCE(!r && kref_read(&svm_bo->kref) != 1, "This was not the last reference\n"); 3370 svm_range_bo_unref(svm_bo); 3371 } 3372 3373 static int 3374 svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm, 3375 uint64_t start, uint64_t size, uint32_t nattr, 3376 struct kfd_ioctl_svm_attribute *attrs) 3377 { 3378 struct amdkfd_process_info *process_info = p->kgd_process_info; 3379 struct list_head update_list; 3380 struct list_head insert_list; 3381 struct list_head remove_list; 3382 struct svm_range_list *svms; 3383 struct svm_range *prange; 3384 struct svm_range *next; 3385 bool update_mapping = false; 3386 bool flush_tlb; 3387 int r = 0; 3388 3389 pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] pages 0x%llx\n", 3390 p->pasid, &p->svms, start, start + size - 1, size); 3391 3392 r = svm_range_check_attr(p, nattr, attrs); 3393 if (r) 3394 return r; 3395 3396 svms = &p->svms; 3397 3398 mutex_lock(&process_info->lock); 3399 3400 svm_range_list_lock_and_flush_work(svms, mm); 3401 3402 r = svm_range_is_valid(p, start, size); 3403 if (r) { 3404 pr_debug("invalid range r=%d\n", r); 3405 mmap_write_unlock(mm); 3406 goto out; 3407 } 3408 3409 mutex_lock(&svms->lock); 3410 3411 /* Add new range and split existing ranges as needed */ 3412 r = svm_range_add(p, start, size, nattr, attrs, &update_list, 3413 &insert_list, &remove_list); 3414 if (r) { 3415 mutex_unlock(&svms->lock); 3416 mmap_write_unlock(mm); 3417 goto out; 3418 } 3419 /* Apply changes as a transaction */ 3420 list_for_each_entry_safe(prange, next, &insert_list, list) { 3421 svm_range_add_to_svms(prange); 3422 svm_range_add_notifier_locked(mm, prange); 3423 } 3424 list_for_each_entry(prange, &update_list, update_list) { 3425 svm_range_apply_attrs(p, prange, nattr, attrs, &update_mapping); 3426 /* TODO: unmap ranges from GPU that lost access */ 3427 } 3428 list_for_each_entry_safe(prange, next, &remove_list, update_list) { 3429 pr_debug("unlink old 0x%p prange 0x%p [0x%lx 0x%lx]\n", 3430 prange->svms, prange, prange->start, 3431 prange->last); 3432 svm_range_unlink(prange); 3433 svm_range_remove_notifier(prange); 3434 svm_range_free(prange, false); 3435 } 3436 3437 mmap_write_downgrade(mm); 3438 /* Trigger migrations and revalidate and map to GPUs as needed. If 3439 * this fails we may be left with partially completed actions. There 3440 * is no clean way of rolling back to the previous state in such a 3441 * case because the rollback wouldn't be guaranteed to work either. 3442 */ 3443 list_for_each_entry(prange, &update_list, update_list) { 3444 bool migrated; 3445 3446 mutex_lock(&prange->migrate_mutex); 3447 3448 r = svm_range_trigger_migration(mm, prange, &migrated); 3449 if (r) 3450 goto out_unlock_range; 3451 3452 if (migrated && (!p->xnack_enabled || 3453 (prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) && 3454 prange->mapped_to_gpu) { 3455 pr_debug("restore_work will update mappings of GPUs\n"); 3456 mutex_unlock(&prange->migrate_mutex); 3457 continue; 3458 } 3459 3460 if (!migrated && !update_mapping) { 3461 mutex_unlock(&prange->migrate_mutex); 3462 continue; 3463 } 3464 3465 flush_tlb = !migrated && update_mapping && prange->mapped_to_gpu; 3466 3467 r = svm_range_validate_and_map(mm, prange, MAX_GPU_INSTANCE, 3468 true, true, flush_tlb); 3469 if (r) 3470 pr_debug("failed %d to map svm range\n", r); 3471 3472 out_unlock_range: 3473 mutex_unlock(&prange->migrate_mutex); 3474 if (r) 3475 break; 3476 } 3477 3478 svm_range_debug_dump(svms); 3479 3480 mutex_unlock(&svms->lock); 3481 mmap_read_unlock(mm); 3482 out: 3483 mutex_unlock(&process_info->lock); 3484 3485 pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] done, r=%d\n", p->pasid, 3486 &p->svms, start, start + size - 1, r); 3487 3488 return r; 3489 } 3490 3491 static int 3492 svm_range_get_attr(struct kfd_process *p, struct mm_struct *mm, 3493 uint64_t start, uint64_t size, uint32_t nattr, 3494 struct kfd_ioctl_svm_attribute *attrs) 3495 { 3496 DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE); 3497 DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE); 3498 bool get_preferred_loc = false; 3499 bool get_prefetch_loc = false; 3500 bool get_granularity = false; 3501 bool get_accessible = false; 3502 bool get_flags = false; 3503 uint64_t last = start + size - 1UL; 3504 uint8_t granularity = 0xff; 3505 struct interval_tree_node *node; 3506 struct svm_range_list *svms; 3507 struct svm_range *prange; 3508 uint32_t prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3509 uint32_t location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3510 uint32_t flags_and = 0xffffffff; 3511 uint32_t flags_or = 0; 3512 int gpuidx; 3513 uint32_t i; 3514 int r = 0; 3515 3516 pr_debug("svms 0x%p [0x%llx 0x%llx] nattr 0x%x\n", &p->svms, start, 3517 start + size - 1, nattr); 3518 3519 /* Flush pending deferred work to avoid racing with deferred actions from 3520 * previous memory map changes (e.g. munmap). Concurrent memory map changes 3521 * can still race with get_attr because we don't hold the mmap lock. But that 3522 * would be a race condition in the application anyway, and undefined 3523 * behaviour is acceptable in that case. 3524 */ 3525 flush_work(&p->svms.deferred_list_work); 3526 3527 mmap_read_lock(mm); 3528 r = svm_range_is_valid(p, start, size); 3529 mmap_read_unlock(mm); 3530 if (r) { 3531 pr_debug("invalid range r=%d\n", r); 3532 return r; 3533 } 3534 3535 for (i = 0; i < nattr; i++) { 3536 switch (attrs[i].type) { 3537 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 3538 get_preferred_loc = true; 3539 break; 3540 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3541 get_prefetch_loc = true; 3542 break; 3543 case KFD_IOCTL_SVM_ATTR_ACCESS: 3544 get_accessible = true; 3545 break; 3546 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3547 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 3548 get_flags = true; 3549 break; 3550 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 3551 get_granularity = true; 3552 break; 3553 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 3554 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 3555 fallthrough; 3556 default: 3557 pr_debug("get invalid attr type 0x%x\n", attrs[i].type); 3558 return -EINVAL; 3559 } 3560 } 3561 3562 svms = &p->svms; 3563 3564 mutex_lock(&svms->lock); 3565 3566 node = interval_tree_iter_first(&svms->objects, start, last); 3567 if (!node) { 3568 pr_debug("range attrs not found return default values\n"); 3569 svm_range_set_default_attributes(&location, &prefetch_loc, 3570 &granularity, &flags_and); 3571 flags_or = flags_and; 3572 if (p->xnack_enabled) 3573 bitmap_copy(bitmap_access, svms->bitmap_supported, 3574 MAX_GPU_INSTANCE); 3575 else 3576 bitmap_zero(bitmap_access, MAX_GPU_INSTANCE); 3577 bitmap_zero(bitmap_aip, MAX_GPU_INSTANCE); 3578 goto fill_values; 3579 } 3580 bitmap_copy(bitmap_access, svms->bitmap_supported, MAX_GPU_INSTANCE); 3581 bitmap_copy(bitmap_aip, svms->bitmap_supported, MAX_GPU_INSTANCE); 3582 3583 while (node) { 3584 struct interval_tree_node *next; 3585 3586 prange = container_of(node, struct svm_range, it_node); 3587 next = interval_tree_iter_next(node, start, last); 3588 3589 if (get_preferred_loc) { 3590 if (prange->preferred_loc == 3591 KFD_IOCTL_SVM_LOCATION_UNDEFINED || 3592 (location != KFD_IOCTL_SVM_LOCATION_UNDEFINED && 3593 location != prange->preferred_loc)) { 3594 location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3595 get_preferred_loc = false; 3596 } else { 3597 location = prange->preferred_loc; 3598 } 3599 } 3600 if (get_prefetch_loc) { 3601 if (prange->prefetch_loc == 3602 KFD_IOCTL_SVM_LOCATION_UNDEFINED || 3603 (prefetch_loc != KFD_IOCTL_SVM_LOCATION_UNDEFINED && 3604 prefetch_loc != prange->prefetch_loc)) { 3605 prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3606 get_prefetch_loc = false; 3607 } else { 3608 prefetch_loc = prange->prefetch_loc; 3609 } 3610 } 3611 if (get_accessible) { 3612 bitmap_and(bitmap_access, bitmap_access, 3613 prange->bitmap_access, MAX_GPU_INSTANCE); 3614 bitmap_and(bitmap_aip, bitmap_aip, 3615 prange->bitmap_aip, MAX_GPU_INSTANCE); 3616 } 3617 if (get_flags) { 3618 flags_and &= prange->flags; 3619 flags_or |= prange->flags; 3620 } 3621 3622 if (get_granularity && prange->granularity < granularity) 3623 granularity = prange->granularity; 3624 3625 node = next; 3626 } 3627 fill_values: 3628 mutex_unlock(&svms->lock); 3629 3630 for (i = 0; i < nattr; i++) { 3631 switch (attrs[i].type) { 3632 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 3633 attrs[i].value = location; 3634 break; 3635 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3636 attrs[i].value = prefetch_loc; 3637 break; 3638 case KFD_IOCTL_SVM_ATTR_ACCESS: 3639 gpuidx = kfd_process_gpuidx_from_gpuid(p, 3640 attrs[i].value); 3641 if (gpuidx < 0) { 3642 pr_debug("invalid gpuid %x\n", attrs[i].value); 3643 return -EINVAL; 3644 } 3645 if (test_bit(gpuidx, bitmap_access)) 3646 attrs[i].type = KFD_IOCTL_SVM_ATTR_ACCESS; 3647 else if (test_bit(gpuidx, bitmap_aip)) 3648 attrs[i].type = 3649 KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE; 3650 else 3651 attrs[i].type = KFD_IOCTL_SVM_ATTR_NO_ACCESS; 3652 break; 3653 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3654 attrs[i].value = flags_and; 3655 break; 3656 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 3657 attrs[i].value = ~flags_or; 3658 break; 3659 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 3660 attrs[i].value = (uint32_t)granularity; 3661 break; 3662 } 3663 } 3664 3665 return 0; 3666 } 3667 3668 int kfd_criu_resume_svm(struct kfd_process *p) 3669 { 3670 struct kfd_ioctl_svm_attribute *set_attr_new, *set_attr = NULL; 3671 int nattr_common = 4, nattr_accessibility = 1; 3672 struct criu_svm_metadata *criu_svm_md = NULL; 3673 struct svm_range_list *svms = &p->svms; 3674 struct criu_svm_metadata *next = NULL; 3675 uint32_t set_flags = 0xffffffff; 3676 int i, j, num_attrs, ret = 0; 3677 uint64_t set_attr_size; 3678 struct mm_struct *mm; 3679 3680 if (list_empty(&svms->criu_svm_metadata_list)) { 3681 pr_debug("No SVM data from CRIU restore stage 2\n"); 3682 return ret; 3683 } 3684 3685 mm = get_task_mm(p->lead_thread); 3686 if (!mm) { 3687 pr_err("failed to get mm for the target process\n"); 3688 return -ESRCH; 3689 } 3690 3691 num_attrs = nattr_common + (nattr_accessibility * p->n_pdds); 3692 3693 i = j = 0; 3694 list_for_each_entry(criu_svm_md, &svms->criu_svm_metadata_list, list) { 3695 pr_debug("criu_svm_md[%d]\n\tstart: 0x%llx size: 0x%llx (npages)\n", 3696 i, criu_svm_md->data.start_addr, criu_svm_md->data.size); 3697 3698 for (j = 0; j < num_attrs; j++) { 3699 pr_debug("\ncriu_svm_md[%d]->attrs[%d].type : 0x%x\ncriu_svm_md[%d]->attrs[%d].value : 0x%x\n", 3700 i, j, criu_svm_md->data.attrs[j].type, 3701 i, j, criu_svm_md->data.attrs[j].value); 3702 switch (criu_svm_md->data.attrs[j].type) { 3703 /* During Checkpoint operation, the query for 3704 * KFD_IOCTL_SVM_ATTR_PREFETCH_LOC attribute might 3705 * return KFD_IOCTL_SVM_LOCATION_UNDEFINED if they were 3706 * not used by the range which was checkpointed. Care 3707 * must be taken to not restore with an invalid value 3708 * otherwise the gpuidx value will be invalid and 3709 * set_attr would eventually fail so just replace those 3710 * with another dummy attribute such as 3711 * KFD_IOCTL_SVM_ATTR_SET_FLAGS. 3712 */ 3713 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3714 if (criu_svm_md->data.attrs[j].value == 3715 KFD_IOCTL_SVM_LOCATION_UNDEFINED) { 3716 criu_svm_md->data.attrs[j].type = 3717 KFD_IOCTL_SVM_ATTR_SET_FLAGS; 3718 criu_svm_md->data.attrs[j].value = 0; 3719 } 3720 break; 3721 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3722 set_flags = criu_svm_md->data.attrs[j].value; 3723 break; 3724 default: 3725 break; 3726 } 3727 } 3728 3729 /* CLR_FLAGS is not available via get_attr during checkpoint but 3730 * it needs to be inserted before restoring the ranges so 3731 * allocate extra space for it before calling set_attr 3732 */ 3733 set_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 3734 (num_attrs + 1); 3735 set_attr_new = krealloc(set_attr, set_attr_size, 3736 GFP_KERNEL); 3737 if (!set_attr_new) { 3738 ret = -ENOMEM; 3739 goto exit; 3740 } 3741 set_attr = set_attr_new; 3742 3743 memcpy(set_attr, criu_svm_md->data.attrs, num_attrs * 3744 sizeof(struct kfd_ioctl_svm_attribute)); 3745 set_attr[num_attrs].type = KFD_IOCTL_SVM_ATTR_CLR_FLAGS; 3746 set_attr[num_attrs].value = ~set_flags; 3747 3748 ret = svm_range_set_attr(p, mm, criu_svm_md->data.start_addr, 3749 criu_svm_md->data.size, num_attrs + 1, 3750 set_attr); 3751 if (ret) { 3752 pr_err("CRIU: failed to set range attributes\n"); 3753 goto exit; 3754 } 3755 3756 i++; 3757 } 3758 exit: 3759 kfree(set_attr); 3760 list_for_each_entry_safe(criu_svm_md, next, &svms->criu_svm_metadata_list, list) { 3761 pr_debug("freeing criu_svm_md[]\n\tstart: 0x%llx\n", 3762 criu_svm_md->data.start_addr); 3763 kfree(criu_svm_md); 3764 } 3765 3766 mmput(mm); 3767 return ret; 3768 3769 } 3770 3771 int kfd_criu_restore_svm(struct kfd_process *p, 3772 uint8_t __user *user_priv_ptr, 3773 uint64_t *priv_data_offset, 3774 uint64_t max_priv_data_size) 3775 { 3776 uint64_t svm_priv_data_size, svm_object_md_size, svm_attrs_size; 3777 int nattr_common = 4, nattr_accessibility = 1; 3778 struct criu_svm_metadata *criu_svm_md = NULL; 3779 struct svm_range_list *svms = &p->svms; 3780 uint32_t num_devices; 3781 int ret = 0; 3782 3783 num_devices = p->n_pdds; 3784 /* Handle one SVM range object at a time, also the number of gpus are 3785 * assumed to be same on the restore node, checking must be done while 3786 * evaluating the topology earlier 3787 */ 3788 3789 svm_attrs_size = sizeof(struct kfd_ioctl_svm_attribute) * 3790 (nattr_common + nattr_accessibility * num_devices); 3791 svm_object_md_size = sizeof(struct criu_svm_metadata) + svm_attrs_size; 3792 3793 svm_priv_data_size = sizeof(struct kfd_criu_svm_range_priv_data) + 3794 svm_attrs_size; 3795 3796 criu_svm_md = kzalloc(svm_object_md_size, GFP_KERNEL); 3797 if (!criu_svm_md) { 3798 pr_err("failed to allocate memory to store svm metadata\n"); 3799 return -ENOMEM; 3800 } 3801 if (*priv_data_offset + svm_priv_data_size > max_priv_data_size) { 3802 ret = -EINVAL; 3803 goto exit; 3804 } 3805 3806 ret = copy_from_user(&criu_svm_md->data, user_priv_ptr + *priv_data_offset, 3807 svm_priv_data_size); 3808 if (ret) { 3809 ret = -EFAULT; 3810 goto exit; 3811 } 3812 *priv_data_offset += svm_priv_data_size; 3813 3814 list_add_tail(&criu_svm_md->list, &svms->criu_svm_metadata_list); 3815 3816 return 0; 3817 3818 3819 exit: 3820 kfree(criu_svm_md); 3821 return ret; 3822 } 3823 3824 int svm_range_get_info(struct kfd_process *p, uint32_t *num_svm_ranges, 3825 uint64_t *svm_priv_data_size) 3826 { 3827 uint64_t total_size, accessibility_size, common_attr_size; 3828 int nattr_common = 4, nattr_accessibility = 1; 3829 int num_devices = p->n_pdds; 3830 struct svm_range_list *svms; 3831 struct svm_range *prange; 3832 uint32_t count = 0; 3833 3834 *svm_priv_data_size = 0; 3835 3836 svms = &p->svms; 3837 if (!svms) 3838 return -EINVAL; 3839 3840 mutex_lock(&svms->lock); 3841 list_for_each_entry(prange, &svms->list, list) { 3842 pr_debug("prange: 0x%p start: 0x%lx\t npages: 0x%llx\t end: 0x%llx\n", 3843 prange, prange->start, prange->npages, 3844 prange->start + prange->npages - 1); 3845 count++; 3846 } 3847 mutex_unlock(&svms->lock); 3848 3849 *num_svm_ranges = count; 3850 /* Only the accessbility attributes need to be queried for all the gpus 3851 * individually, remaining ones are spanned across the entire process 3852 * regardless of the various gpu nodes. Of the remaining attributes, 3853 * KFD_IOCTL_SVM_ATTR_CLR_FLAGS need not be saved. 3854 * 3855 * KFD_IOCTL_SVM_ATTR_PREFERRED_LOC 3856 * KFD_IOCTL_SVM_ATTR_PREFETCH_LOC 3857 * KFD_IOCTL_SVM_ATTR_SET_FLAGS 3858 * KFD_IOCTL_SVM_ATTR_GRANULARITY 3859 * 3860 * ** ACCESSBILITY ATTRIBUTES ** 3861 * (Considered as one, type is altered during query, value is gpuid) 3862 * KFD_IOCTL_SVM_ATTR_ACCESS 3863 * KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE 3864 * KFD_IOCTL_SVM_ATTR_NO_ACCESS 3865 */ 3866 if (*num_svm_ranges > 0) { 3867 common_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 3868 nattr_common; 3869 accessibility_size = sizeof(struct kfd_ioctl_svm_attribute) * 3870 nattr_accessibility * num_devices; 3871 3872 total_size = sizeof(struct kfd_criu_svm_range_priv_data) + 3873 common_attr_size + accessibility_size; 3874 3875 *svm_priv_data_size = *num_svm_ranges * total_size; 3876 } 3877 3878 pr_debug("num_svm_ranges %u total_priv_size %llu\n", *num_svm_ranges, 3879 *svm_priv_data_size); 3880 return 0; 3881 } 3882 3883 int kfd_criu_checkpoint_svm(struct kfd_process *p, 3884 uint8_t __user *user_priv_data, 3885 uint64_t *priv_data_offset) 3886 { 3887 struct kfd_criu_svm_range_priv_data *svm_priv = NULL; 3888 struct kfd_ioctl_svm_attribute *query_attr = NULL; 3889 uint64_t svm_priv_data_size, query_attr_size = 0; 3890 int index, nattr_common = 4, ret = 0; 3891 struct svm_range_list *svms; 3892 int num_devices = p->n_pdds; 3893 struct svm_range *prange; 3894 struct mm_struct *mm; 3895 3896 svms = &p->svms; 3897 if (!svms) 3898 return -EINVAL; 3899 3900 mm = get_task_mm(p->lead_thread); 3901 if (!mm) { 3902 pr_err("failed to get mm for the target process\n"); 3903 return -ESRCH; 3904 } 3905 3906 query_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 3907 (nattr_common + num_devices); 3908 3909 query_attr = kzalloc(query_attr_size, GFP_KERNEL); 3910 if (!query_attr) { 3911 ret = -ENOMEM; 3912 goto exit; 3913 } 3914 3915 query_attr[0].type = KFD_IOCTL_SVM_ATTR_PREFERRED_LOC; 3916 query_attr[1].type = KFD_IOCTL_SVM_ATTR_PREFETCH_LOC; 3917 query_attr[2].type = KFD_IOCTL_SVM_ATTR_SET_FLAGS; 3918 query_attr[3].type = KFD_IOCTL_SVM_ATTR_GRANULARITY; 3919 3920 for (index = 0; index < num_devices; index++) { 3921 struct kfd_process_device *pdd = p->pdds[index]; 3922 3923 query_attr[index + nattr_common].type = 3924 KFD_IOCTL_SVM_ATTR_ACCESS; 3925 query_attr[index + nattr_common].value = pdd->user_gpu_id; 3926 } 3927 3928 svm_priv_data_size = sizeof(*svm_priv) + query_attr_size; 3929 3930 svm_priv = kzalloc(svm_priv_data_size, GFP_KERNEL); 3931 if (!svm_priv) { 3932 ret = -ENOMEM; 3933 goto exit_query; 3934 } 3935 3936 index = 0; 3937 list_for_each_entry(prange, &svms->list, list) { 3938 3939 svm_priv->object_type = KFD_CRIU_OBJECT_TYPE_SVM_RANGE; 3940 svm_priv->start_addr = prange->start; 3941 svm_priv->size = prange->npages; 3942 memcpy(&svm_priv->attrs, query_attr, query_attr_size); 3943 pr_debug("CRIU: prange: 0x%p start: 0x%lx\t npages: 0x%llx end: 0x%llx\t size: 0x%llx\n", 3944 prange, prange->start, prange->npages, 3945 prange->start + prange->npages - 1, 3946 prange->npages * PAGE_SIZE); 3947 3948 ret = svm_range_get_attr(p, mm, svm_priv->start_addr, 3949 svm_priv->size, 3950 (nattr_common + num_devices), 3951 svm_priv->attrs); 3952 if (ret) { 3953 pr_err("CRIU: failed to obtain range attributes\n"); 3954 goto exit_priv; 3955 } 3956 3957 if (copy_to_user(user_priv_data + *priv_data_offset, svm_priv, 3958 svm_priv_data_size)) { 3959 pr_err("Failed to copy svm priv to user\n"); 3960 ret = -EFAULT; 3961 goto exit_priv; 3962 } 3963 3964 *priv_data_offset += svm_priv_data_size; 3965 3966 } 3967 3968 3969 exit_priv: 3970 kfree(svm_priv); 3971 exit_query: 3972 kfree(query_attr); 3973 exit: 3974 mmput(mm); 3975 return ret; 3976 } 3977 3978 int 3979 svm_ioctl(struct kfd_process *p, enum kfd_ioctl_svm_op op, uint64_t start, 3980 uint64_t size, uint32_t nattrs, struct kfd_ioctl_svm_attribute *attrs) 3981 { 3982 struct mm_struct *mm = current->mm; 3983 int r; 3984 3985 start >>= PAGE_SHIFT; 3986 size >>= PAGE_SHIFT; 3987 3988 switch (op) { 3989 case KFD_IOCTL_SVM_OP_SET_ATTR: 3990 r = svm_range_set_attr(p, mm, start, size, nattrs, attrs); 3991 break; 3992 case KFD_IOCTL_SVM_OP_GET_ATTR: 3993 r = svm_range_get_attr(p, mm, start, size, nattrs, attrs); 3994 break; 3995 default: 3996 r = EINVAL; 3997 break; 3998 } 3999 4000 return r; 4001 } 4002