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 <linux/dynamic_debug.h> 27 #include <drm/ttm/ttm_tt.h> 28 #include <drm/drm_exec.h> 29 30 #include "amdgpu_sync.h" 31 #include "amdgpu_object.h" 32 #include "amdgpu_vm.h" 33 #include "amdgpu_hmm.h" 34 #include "amdgpu.h" 35 #include "amdgpu_xgmi.h" 36 #include "kfd_priv.h" 37 #include "kfd_svm.h" 38 #include "kfd_migrate.h" 39 #include "kfd_smi_events.h" 40 41 #ifdef dev_fmt 42 #undef dev_fmt 43 #endif 44 #define dev_fmt(fmt) "kfd_svm: %s: " fmt, __func__ 45 46 #define AMDGPU_SVM_RANGE_RESTORE_DELAY_MS 1 47 48 /* Long enough to ensure no retry fault comes after svm range is restored and 49 * page table is updated. 50 */ 51 #define AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING (2UL * NSEC_PER_MSEC) 52 #if IS_ENABLED(CONFIG_DYNAMIC_DEBUG) 53 #define dynamic_svm_range_dump(svms) \ 54 _dynamic_func_call_no_desc("svm_range_dump", svm_range_debug_dump, svms) 55 #else 56 #define dynamic_svm_range_dump(svms) \ 57 do { if (0) svm_range_debug_dump(svms); } while (0) 58 #endif 59 60 /* Giant svm range split into smaller ranges based on this, it is decided using 61 * minimum of all dGPU/APU 1/32 VRAM size, between 2MB to 1GB and alignment to 62 * power of 2MB. 63 */ 64 static uint64_t max_svm_range_pages; 65 66 struct criu_svm_metadata { 67 struct list_head list; 68 struct kfd_criu_svm_range_priv_data data; 69 }; 70 71 static void svm_range_evict_svm_bo_worker(struct work_struct *work); 72 static bool 73 svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, 74 const struct mmu_notifier_range *range, 75 unsigned long cur_seq); 76 static int 77 svm_range_check_vm(struct kfd_process *p, uint64_t start, uint64_t last, 78 uint64_t *bo_s, uint64_t *bo_l); 79 static const struct mmu_interval_notifier_ops svm_range_mn_ops = { 80 .invalidate = svm_range_cpu_invalidate_pagetables, 81 }; 82 83 /** 84 * svm_range_unlink - unlink svm_range from lists and interval tree 85 * @prange: svm range structure to be removed 86 * 87 * Remove the svm_range from the svms and svm_bo lists and the svms 88 * interval tree. 89 * 90 * Context: The caller must hold svms->lock 91 */ 92 static void svm_range_unlink(struct svm_range *prange) 93 { 94 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 95 prange, prange->start, prange->last); 96 97 if (prange->svm_bo) { 98 spin_lock(&prange->svm_bo->list_lock); 99 list_del(&prange->svm_bo_list); 100 spin_unlock(&prange->svm_bo->list_lock); 101 } 102 103 list_del(&prange->list); 104 if (prange->it_node.start != 0 && prange->it_node.last != 0) 105 interval_tree_remove(&prange->it_node, &prange->svms->objects); 106 } 107 108 static void 109 svm_range_add_notifier_locked(struct mm_struct *mm, struct svm_range *prange) 110 { 111 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 112 prange, prange->start, prange->last); 113 114 mmu_interval_notifier_insert_locked(&prange->notifier, mm, 115 prange->start << PAGE_SHIFT, 116 prange->npages << PAGE_SHIFT, 117 &svm_range_mn_ops); 118 } 119 120 /** 121 * svm_range_add_to_svms - add svm range to svms 122 * @prange: svm range structure to be added 123 * 124 * Add the svm range to svms interval tree and link list 125 * 126 * Context: The caller must hold svms->lock 127 */ 128 static void svm_range_add_to_svms(struct svm_range *prange) 129 { 130 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, 131 prange, prange->start, prange->last); 132 133 list_move_tail(&prange->list, &prange->svms->list); 134 prange->it_node.start = prange->start; 135 prange->it_node.last = prange->last; 136 interval_tree_insert(&prange->it_node, &prange->svms->objects); 137 } 138 139 static void svm_range_remove_notifier(struct svm_range *prange) 140 { 141 pr_debug("remove notifier svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", 142 prange->svms, prange, 143 prange->notifier.interval_tree.start >> PAGE_SHIFT, 144 prange->notifier.interval_tree.last >> PAGE_SHIFT); 145 146 if (prange->notifier.interval_tree.start != 0 && 147 prange->notifier.interval_tree.last != 0) 148 mmu_interval_notifier_remove(&prange->notifier); 149 } 150 151 static bool 152 svm_is_valid_dma_mapping_addr(struct device *dev, dma_addr_t dma_addr) 153 { 154 return dma_addr && !dma_mapping_error(dev, dma_addr) && 155 !(dma_addr & SVM_RANGE_VRAM_DOMAIN); 156 } 157 158 static int 159 svm_range_dma_map_dev(struct amdgpu_device *adev, struct svm_range *prange, 160 unsigned long offset, unsigned long npages, 161 unsigned long *hmm_pfns, uint32_t gpuidx) 162 { 163 enum dma_data_direction dir = DMA_BIDIRECTIONAL; 164 dma_addr_t *addr = prange->dma_addr[gpuidx]; 165 struct device *dev = adev->dev; 166 struct page *page; 167 int i, r; 168 169 if (!addr) { 170 addr = kvcalloc(prange->npages, sizeof(*addr), GFP_KERNEL); 171 if (!addr) 172 return -ENOMEM; 173 prange->dma_addr[gpuidx] = addr; 174 } 175 176 addr += offset; 177 for (i = 0; i < npages; i++) { 178 if (svm_is_valid_dma_mapping_addr(dev, addr[i])) 179 dma_unmap_page(dev, addr[i], PAGE_SIZE, dir); 180 181 page = hmm_pfn_to_page(hmm_pfns[i]); 182 if (is_zone_device_page(page)) { 183 struct amdgpu_device *bo_adev = prange->svm_bo->node->adev; 184 185 addr[i] = (hmm_pfns[i] << PAGE_SHIFT) + 186 bo_adev->vm_manager.vram_base_offset - 187 bo_adev->kfd.pgmap.range.start; 188 addr[i] |= SVM_RANGE_VRAM_DOMAIN; 189 pr_debug_ratelimited("vram address: 0x%llx\n", addr[i]); 190 continue; 191 } 192 addr[i] = dma_map_page(dev, page, 0, PAGE_SIZE, dir); 193 r = dma_mapping_error(dev, addr[i]); 194 if (r) { 195 dev_err(dev, "failed %d dma_map_page\n", r); 196 return r; 197 } 198 pr_debug_ratelimited("dma mapping 0x%llx for page addr 0x%lx\n", 199 addr[i] >> PAGE_SHIFT, page_to_pfn(page)); 200 } 201 202 return 0; 203 } 204 205 static int 206 svm_range_dma_map(struct svm_range *prange, unsigned long *bitmap, 207 unsigned long offset, unsigned long npages, 208 unsigned long *hmm_pfns) 209 { 210 struct kfd_process *p; 211 uint32_t gpuidx; 212 int r; 213 214 p = container_of(prange->svms, struct kfd_process, svms); 215 216 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 217 struct kfd_process_device *pdd; 218 219 pr_debug("mapping to gpu idx 0x%x\n", gpuidx); 220 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 221 if (!pdd) { 222 pr_debug("failed to find device idx %d\n", gpuidx); 223 return -EINVAL; 224 } 225 226 r = svm_range_dma_map_dev(pdd->dev->adev, prange, offset, npages, 227 hmm_pfns, gpuidx); 228 if (r) 229 break; 230 } 231 232 return r; 233 } 234 235 void svm_range_dma_unmap_dev(struct device *dev, dma_addr_t *dma_addr, 236 unsigned long offset, unsigned long npages) 237 { 238 enum dma_data_direction dir = DMA_BIDIRECTIONAL; 239 int i; 240 241 if (!dma_addr) 242 return; 243 244 for (i = offset; i < offset + npages; i++) { 245 if (!svm_is_valid_dma_mapping_addr(dev, dma_addr[i])) 246 continue; 247 pr_debug_ratelimited("unmap 0x%llx\n", dma_addr[i] >> PAGE_SHIFT); 248 dma_unmap_page(dev, dma_addr[i], PAGE_SIZE, dir); 249 dma_addr[i] = 0; 250 } 251 } 252 253 void svm_range_dma_unmap(struct svm_range *prange) 254 { 255 struct kfd_process_device *pdd; 256 dma_addr_t *dma_addr; 257 struct device *dev; 258 struct kfd_process *p; 259 uint32_t gpuidx; 260 261 p = container_of(prange->svms, struct kfd_process, svms); 262 263 for (gpuidx = 0; gpuidx < MAX_GPU_INSTANCE; gpuidx++) { 264 dma_addr = prange->dma_addr[gpuidx]; 265 if (!dma_addr) 266 continue; 267 268 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 269 if (!pdd) { 270 pr_debug("failed to find device idx %d\n", gpuidx); 271 continue; 272 } 273 dev = &pdd->dev->adev->pdev->dev; 274 275 svm_range_dma_unmap_dev(dev, dma_addr, 0, prange->npages); 276 } 277 } 278 279 static void svm_range_free(struct svm_range *prange, bool do_unmap) 280 { 281 uint64_t size = (prange->last - prange->start + 1) << PAGE_SHIFT; 282 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); 283 uint32_t gpuidx; 284 285 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms, prange, 286 prange->start, prange->last); 287 288 svm_range_vram_node_free(prange); 289 if (do_unmap) 290 svm_range_dma_unmap(prange); 291 292 if (do_unmap && !p->xnack_enabled) { 293 pr_debug("unreserve prange 0x%p size: 0x%llx\n", prange, size); 294 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 295 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 296 } 297 298 /* free dma_addr array for each gpu */ 299 for (gpuidx = 0; gpuidx < MAX_GPU_INSTANCE; gpuidx++) { 300 if (prange->dma_addr[gpuidx]) { 301 kvfree(prange->dma_addr[gpuidx]); 302 prange->dma_addr[gpuidx] = NULL; 303 } 304 } 305 306 mutex_destroy(&prange->lock); 307 mutex_destroy(&prange->migrate_mutex); 308 kfree(prange); 309 } 310 311 static void 312 svm_range_set_default_attributes(struct svm_range_list *svms, int32_t *location, 313 int32_t *prefetch_loc, uint8_t *granularity, 314 uint32_t *flags) 315 { 316 *location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 317 *prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 318 *granularity = svms->default_granularity; 319 *flags = 320 KFD_IOCTL_SVM_FLAG_HOST_ACCESS | KFD_IOCTL_SVM_FLAG_COHERENT; 321 } 322 323 static struct 324 svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start, 325 uint64_t last, bool update_mem_usage) 326 { 327 uint64_t size = last - start + 1; 328 struct svm_range *prange; 329 struct kfd_process *p; 330 331 prange = kzalloc(sizeof(*prange), GFP_KERNEL); 332 if (!prange) 333 return NULL; 334 335 p = container_of(svms, struct kfd_process, svms); 336 if (!p->xnack_enabled && update_mem_usage && 337 amdgpu_amdkfd_reserve_mem_limit(NULL, size << PAGE_SHIFT, 338 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0)) { 339 pr_info("SVM mapping failed, exceeds resident system memory limit\n"); 340 kfree(prange); 341 return NULL; 342 } 343 prange->npages = size; 344 prange->svms = svms; 345 prange->start = start; 346 prange->last = last; 347 INIT_LIST_HEAD(&prange->list); 348 INIT_LIST_HEAD(&prange->update_list); 349 INIT_LIST_HEAD(&prange->svm_bo_list); 350 INIT_LIST_HEAD(&prange->deferred_list); 351 INIT_LIST_HEAD(&prange->child_list); 352 atomic_set(&prange->invalid, 0); 353 prange->validate_timestamp = 0; 354 prange->vram_pages = 0; 355 mutex_init(&prange->migrate_mutex); 356 mutex_init(&prange->lock); 357 358 if (p->xnack_enabled) 359 bitmap_copy(prange->bitmap_access, svms->bitmap_supported, 360 MAX_GPU_INSTANCE); 361 362 svm_range_set_default_attributes(svms, &prange->preferred_loc, 363 &prange->prefetch_loc, 364 &prange->granularity, &prange->flags); 365 366 pr_debug("svms 0x%p [0x%llx 0x%llx]\n", svms, start, last); 367 368 return prange; 369 } 370 371 static bool svm_bo_ref_unless_zero(struct svm_range_bo *svm_bo) 372 { 373 if (!svm_bo || !kref_get_unless_zero(&svm_bo->kref)) 374 return false; 375 376 return true; 377 } 378 379 static void svm_range_bo_release(struct kref *kref) 380 { 381 struct svm_range_bo *svm_bo; 382 383 svm_bo = container_of(kref, struct svm_range_bo, kref); 384 pr_debug("svm_bo 0x%p\n", svm_bo); 385 386 spin_lock(&svm_bo->list_lock); 387 while (!list_empty(&svm_bo->range_list)) { 388 struct svm_range *prange = 389 list_first_entry(&svm_bo->range_list, 390 struct svm_range, svm_bo_list); 391 /* list_del_init tells a concurrent svm_range_vram_node_new when 392 * it's safe to reuse the svm_bo pointer and svm_bo_list head. 393 */ 394 list_del_init(&prange->svm_bo_list); 395 spin_unlock(&svm_bo->list_lock); 396 397 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, 398 prange->start, prange->last); 399 mutex_lock(&prange->lock); 400 prange->svm_bo = NULL; 401 /* prange should not hold vram page now */ 402 WARN_ONCE(prange->actual_loc, "prange should not hold vram page"); 403 mutex_unlock(&prange->lock); 404 405 spin_lock(&svm_bo->list_lock); 406 } 407 spin_unlock(&svm_bo->list_lock); 408 409 if (mmget_not_zero(svm_bo->eviction_fence->mm)) { 410 struct kfd_process_device *pdd; 411 struct kfd_process *p; 412 struct mm_struct *mm; 413 414 mm = svm_bo->eviction_fence->mm; 415 /* 416 * The forked child process takes svm_bo device pages ref, svm_bo could be 417 * released after parent process is gone. 418 */ 419 p = kfd_lookup_process_by_mm(mm); 420 if (p) { 421 pdd = kfd_get_process_device_data(svm_bo->node, p); 422 if (pdd) 423 atomic64_sub(amdgpu_bo_size(svm_bo->bo), &pdd->vram_usage); 424 kfd_unref_process(p); 425 } 426 mmput(mm); 427 } 428 429 if (!dma_fence_is_signaled(&svm_bo->eviction_fence->base)) 430 /* We're not in the eviction worker. Signal the fence. */ 431 dma_fence_signal(&svm_bo->eviction_fence->base); 432 dma_fence_put(&svm_bo->eviction_fence->base); 433 amdgpu_bo_unref(&svm_bo->bo); 434 kfree(svm_bo); 435 } 436 437 static void svm_range_bo_wq_release(struct work_struct *work) 438 { 439 struct svm_range_bo *svm_bo; 440 441 svm_bo = container_of(work, struct svm_range_bo, release_work); 442 svm_range_bo_release(&svm_bo->kref); 443 } 444 445 static void svm_range_bo_release_async(struct kref *kref) 446 { 447 struct svm_range_bo *svm_bo; 448 449 svm_bo = container_of(kref, struct svm_range_bo, kref); 450 pr_debug("svm_bo 0x%p\n", svm_bo); 451 INIT_WORK(&svm_bo->release_work, svm_range_bo_wq_release); 452 schedule_work(&svm_bo->release_work); 453 } 454 455 void svm_range_bo_unref_async(struct svm_range_bo *svm_bo) 456 { 457 kref_put(&svm_bo->kref, svm_range_bo_release_async); 458 } 459 460 static void svm_range_bo_unref(struct svm_range_bo *svm_bo) 461 { 462 if (svm_bo) 463 kref_put(&svm_bo->kref, svm_range_bo_release); 464 } 465 466 static bool 467 svm_range_validate_svm_bo(struct kfd_node *node, struct svm_range *prange) 468 { 469 mutex_lock(&prange->lock); 470 if (!prange->svm_bo) { 471 mutex_unlock(&prange->lock); 472 return false; 473 } 474 if (prange->ttm_res) { 475 /* We still have a reference, all is well */ 476 mutex_unlock(&prange->lock); 477 return true; 478 } 479 if (svm_bo_ref_unless_zero(prange->svm_bo)) { 480 /* 481 * Migrate from GPU to GPU, remove range from source svm_bo->node 482 * range list, and return false to allocate svm_bo from destination 483 * node. 484 */ 485 if (prange->svm_bo->node != node) { 486 mutex_unlock(&prange->lock); 487 488 spin_lock(&prange->svm_bo->list_lock); 489 list_del_init(&prange->svm_bo_list); 490 spin_unlock(&prange->svm_bo->list_lock); 491 492 svm_range_bo_unref(prange->svm_bo); 493 return false; 494 } 495 if (READ_ONCE(prange->svm_bo->evicting)) { 496 struct dma_fence *f; 497 struct svm_range_bo *svm_bo; 498 /* The BO is getting evicted, 499 * we need to get a new one 500 */ 501 mutex_unlock(&prange->lock); 502 svm_bo = prange->svm_bo; 503 f = dma_fence_get(&svm_bo->eviction_fence->base); 504 svm_range_bo_unref(prange->svm_bo); 505 /* wait for the fence to avoid long spin-loop 506 * at list_empty_careful 507 */ 508 dma_fence_wait(f, false); 509 dma_fence_put(f); 510 } else { 511 /* The BO was still around and we got 512 * a new reference to it 513 */ 514 mutex_unlock(&prange->lock); 515 pr_debug("reuse old bo svms 0x%p [0x%lx 0x%lx]\n", 516 prange->svms, prange->start, prange->last); 517 518 prange->ttm_res = prange->svm_bo->bo->tbo.resource; 519 return true; 520 } 521 522 } else { 523 mutex_unlock(&prange->lock); 524 } 525 526 /* We need a new svm_bo. Spin-loop to wait for concurrent 527 * svm_range_bo_release to finish removing this range from 528 * its range list and set prange->svm_bo to null. After this, 529 * it is safe to reuse the svm_bo pointer and svm_bo_list head. 530 */ 531 while (!list_empty_careful(&prange->svm_bo_list) || prange->svm_bo) 532 cond_resched(); 533 534 return false; 535 } 536 537 static struct svm_range_bo *svm_range_bo_new(void) 538 { 539 struct svm_range_bo *svm_bo; 540 541 svm_bo = kzalloc(sizeof(*svm_bo), GFP_KERNEL); 542 if (!svm_bo) 543 return NULL; 544 545 kref_init(&svm_bo->kref); 546 INIT_LIST_HEAD(&svm_bo->range_list); 547 spin_lock_init(&svm_bo->list_lock); 548 549 return svm_bo; 550 } 551 552 int 553 svm_range_vram_node_new(struct kfd_node *node, struct svm_range *prange, 554 bool clear) 555 { 556 struct kfd_process_device *pdd; 557 struct amdgpu_bo_param bp; 558 struct svm_range_bo *svm_bo; 559 struct amdgpu_bo_user *ubo; 560 struct amdgpu_bo *bo; 561 struct kfd_process *p; 562 struct mm_struct *mm; 563 int r; 564 565 p = container_of(prange->svms, struct kfd_process, svms); 566 pr_debug("pasid: %x svms 0x%p [0x%lx 0x%lx]\n", p->pasid, prange->svms, 567 prange->start, prange->last); 568 569 if (svm_range_validate_svm_bo(node, prange)) 570 return 0; 571 572 svm_bo = svm_range_bo_new(); 573 if (!svm_bo) { 574 pr_debug("failed to alloc svm bo\n"); 575 return -ENOMEM; 576 } 577 mm = get_task_mm(p->lead_thread); 578 if (!mm) { 579 pr_debug("failed to get mm\n"); 580 kfree(svm_bo); 581 return -ESRCH; 582 } 583 svm_bo->node = node; 584 svm_bo->eviction_fence = 585 amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1), 586 mm, 587 svm_bo); 588 mmput(mm); 589 INIT_WORK(&svm_bo->eviction_work, svm_range_evict_svm_bo_worker); 590 svm_bo->evicting = 0; 591 memset(&bp, 0, sizeof(bp)); 592 bp.size = prange->npages * PAGE_SIZE; 593 bp.byte_align = PAGE_SIZE; 594 bp.domain = AMDGPU_GEM_DOMAIN_VRAM; 595 bp.flags = AMDGPU_GEM_CREATE_NO_CPU_ACCESS; 596 bp.flags |= clear ? AMDGPU_GEM_CREATE_VRAM_CLEARED : 0; 597 bp.flags |= AMDGPU_GEM_CREATE_DISCARDABLE; 598 bp.type = ttm_bo_type_device; 599 bp.resv = NULL; 600 if (node->xcp) 601 bp.xcp_id_plus1 = node->xcp->id + 1; 602 603 r = amdgpu_bo_create_user(node->adev, &bp, &ubo); 604 if (r) { 605 pr_debug("failed %d to create bo\n", r); 606 goto create_bo_failed; 607 } 608 bo = &ubo->bo; 609 610 pr_debug("alloc bo at offset 0x%lx size 0x%lx on partition %d\n", 611 bo->tbo.resource->start << PAGE_SHIFT, bp.size, 612 bp.xcp_id_plus1 - 1); 613 614 r = amdgpu_bo_reserve(bo, true); 615 if (r) { 616 pr_debug("failed %d to reserve bo\n", r); 617 goto reserve_bo_failed; 618 } 619 620 if (clear) { 621 r = amdgpu_bo_sync_wait(bo, AMDGPU_FENCE_OWNER_KFD, false); 622 if (r) { 623 pr_debug("failed %d to sync bo\n", r); 624 amdgpu_bo_unreserve(bo); 625 goto reserve_bo_failed; 626 } 627 } 628 629 r = dma_resv_reserve_fences(bo->tbo.base.resv, 1); 630 if (r) { 631 pr_debug("failed %d to reserve bo\n", r); 632 amdgpu_bo_unreserve(bo); 633 goto reserve_bo_failed; 634 } 635 amdgpu_bo_fence(bo, &svm_bo->eviction_fence->base, true); 636 637 amdgpu_bo_unreserve(bo); 638 639 svm_bo->bo = bo; 640 prange->svm_bo = svm_bo; 641 prange->ttm_res = bo->tbo.resource; 642 prange->offset = 0; 643 644 spin_lock(&svm_bo->list_lock); 645 list_add(&prange->svm_bo_list, &svm_bo->range_list); 646 spin_unlock(&svm_bo->list_lock); 647 648 pdd = svm_range_get_pdd_by_node(prange, node); 649 if (pdd) 650 atomic64_add(amdgpu_bo_size(bo), &pdd->vram_usage); 651 652 return 0; 653 654 reserve_bo_failed: 655 amdgpu_bo_unref(&bo); 656 create_bo_failed: 657 dma_fence_put(&svm_bo->eviction_fence->base); 658 kfree(svm_bo); 659 prange->ttm_res = NULL; 660 661 return r; 662 } 663 664 void svm_range_vram_node_free(struct svm_range *prange) 665 { 666 /* serialize prange->svm_bo unref */ 667 mutex_lock(&prange->lock); 668 /* prange->svm_bo has not been unref */ 669 if (prange->ttm_res) { 670 prange->ttm_res = NULL; 671 mutex_unlock(&prange->lock); 672 svm_range_bo_unref(prange->svm_bo); 673 } else 674 mutex_unlock(&prange->lock); 675 } 676 677 struct kfd_node * 678 svm_range_get_node_by_id(struct svm_range *prange, uint32_t gpu_id) 679 { 680 struct kfd_process *p; 681 struct kfd_process_device *pdd; 682 683 p = container_of(prange->svms, struct kfd_process, svms); 684 pdd = kfd_process_device_data_by_id(p, gpu_id); 685 if (!pdd) { 686 pr_debug("failed to get kfd process device by id 0x%x\n", gpu_id); 687 return NULL; 688 } 689 690 return pdd->dev; 691 } 692 693 struct kfd_process_device * 694 svm_range_get_pdd_by_node(struct svm_range *prange, struct kfd_node *node) 695 { 696 struct kfd_process *p; 697 698 p = container_of(prange->svms, struct kfd_process, svms); 699 700 return kfd_get_process_device_data(node, p); 701 } 702 703 static int svm_range_bo_validate(void *param, struct amdgpu_bo *bo) 704 { 705 struct ttm_operation_ctx ctx = { false, false }; 706 707 amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_VRAM); 708 709 return ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); 710 } 711 712 static int 713 svm_range_check_attr(struct kfd_process *p, 714 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs) 715 { 716 uint32_t i; 717 718 for (i = 0; i < nattr; i++) { 719 uint32_t val = attrs[i].value; 720 int gpuidx = MAX_GPU_INSTANCE; 721 722 switch (attrs[i].type) { 723 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 724 if (val != KFD_IOCTL_SVM_LOCATION_SYSMEM && 725 val != KFD_IOCTL_SVM_LOCATION_UNDEFINED) 726 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 727 break; 728 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 729 if (val != KFD_IOCTL_SVM_LOCATION_SYSMEM) 730 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 731 break; 732 case KFD_IOCTL_SVM_ATTR_ACCESS: 733 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 734 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 735 gpuidx = kfd_process_gpuidx_from_gpuid(p, val); 736 break; 737 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 738 break; 739 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 740 break; 741 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 742 break; 743 default: 744 pr_debug("unknown attr type 0x%x\n", attrs[i].type); 745 return -EINVAL; 746 } 747 748 if (gpuidx < 0) { 749 pr_debug("no GPU 0x%x found\n", val); 750 return -EINVAL; 751 } else if (gpuidx < MAX_GPU_INSTANCE && 752 !test_bit(gpuidx, p->svms.bitmap_supported)) { 753 pr_debug("GPU 0x%x not supported\n", val); 754 return -EINVAL; 755 } 756 } 757 758 return 0; 759 } 760 761 static void 762 svm_range_apply_attrs(struct kfd_process *p, struct svm_range *prange, 763 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs, 764 bool *update_mapping) 765 { 766 uint32_t i; 767 int gpuidx; 768 769 for (i = 0; i < nattr; i++) { 770 switch (attrs[i].type) { 771 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 772 prange->preferred_loc = attrs[i].value; 773 break; 774 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 775 prange->prefetch_loc = attrs[i].value; 776 break; 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 if (!p->xnack_enabled) 781 *update_mapping = true; 782 783 gpuidx = kfd_process_gpuidx_from_gpuid(p, 784 attrs[i].value); 785 if (attrs[i].type == KFD_IOCTL_SVM_ATTR_NO_ACCESS) { 786 bitmap_clear(prange->bitmap_access, gpuidx, 1); 787 bitmap_clear(prange->bitmap_aip, gpuidx, 1); 788 } else if (attrs[i].type == KFD_IOCTL_SVM_ATTR_ACCESS) { 789 bitmap_set(prange->bitmap_access, gpuidx, 1); 790 bitmap_clear(prange->bitmap_aip, gpuidx, 1); 791 } else { 792 bitmap_clear(prange->bitmap_access, gpuidx, 1); 793 bitmap_set(prange->bitmap_aip, gpuidx, 1); 794 } 795 break; 796 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 797 *update_mapping = true; 798 prange->flags |= attrs[i].value; 799 break; 800 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 801 *update_mapping = true; 802 prange->flags &= ~attrs[i].value; 803 break; 804 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 805 prange->granularity = min_t(uint32_t, attrs[i].value, 0x3F); 806 break; 807 default: 808 WARN_ONCE(1, "svm_range_check_attrs wasn't called?"); 809 } 810 } 811 } 812 813 static bool 814 svm_range_is_same_attrs(struct kfd_process *p, struct svm_range *prange, 815 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs) 816 { 817 uint32_t i; 818 int gpuidx; 819 820 for (i = 0; i < nattr; i++) { 821 switch (attrs[i].type) { 822 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 823 if (prange->preferred_loc != attrs[i].value) 824 return false; 825 break; 826 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 827 /* Prefetch should always trigger a migration even 828 * if the value of the attribute didn't change. 829 */ 830 return false; 831 case KFD_IOCTL_SVM_ATTR_ACCESS: 832 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 833 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 834 gpuidx = kfd_process_gpuidx_from_gpuid(p, 835 attrs[i].value); 836 if (attrs[i].type == KFD_IOCTL_SVM_ATTR_NO_ACCESS) { 837 if (test_bit(gpuidx, prange->bitmap_access) || 838 test_bit(gpuidx, prange->bitmap_aip)) 839 return false; 840 } else if (attrs[i].type == KFD_IOCTL_SVM_ATTR_ACCESS) { 841 if (!test_bit(gpuidx, prange->bitmap_access)) 842 return false; 843 } else { 844 if (!test_bit(gpuidx, prange->bitmap_aip)) 845 return false; 846 } 847 break; 848 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 849 if ((prange->flags & attrs[i].value) != attrs[i].value) 850 return false; 851 break; 852 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 853 if ((prange->flags & attrs[i].value) != 0) 854 return false; 855 break; 856 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 857 if (prange->granularity != attrs[i].value) 858 return false; 859 break; 860 default: 861 WARN_ONCE(1, "svm_range_check_attrs wasn't called?"); 862 } 863 } 864 865 return true; 866 } 867 868 /** 869 * svm_range_debug_dump - print all range information from svms 870 * @svms: svm range list header 871 * 872 * debug output svm range start, end, prefetch location from svms 873 * interval tree and link list 874 * 875 * Context: The caller must hold svms->lock 876 */ 877 static void svm_range_debug_dump(struct svm_range_list *svms) 878 { 879 struct interval_tree_node *node; 880 struct svm_range *prange; 881 882 pr_debug("dump svms 0x%p list\n", svms); 883 pr_debug("range\tstart\tpage\tend\t\tlocation\n"); 884 885 list_for_each_entry(prange, &svms->list, list) { 886 pr_debug("0x%p 0x%lx\t0x%llx\t0x%llx\t0x%x\n", 887 prange, prange->start, prange->npages, 888 prange->start + prange->npages - 1, 889 prange->actual_loc); 890 } 891 892 pr_debug("dump svms 0x%p interval tree\n", svms); 893 pr_debug("range\tstart\tpage\tend\t\tlocation\n"); 894 node = interval_tree_iter_first(&svms->objects, 0, ~0ULL); 895 while (node) { 896 prange = container_of(node, struct svm_range, it_node); 897 pr_debug("0x%p 0x%lx\t0x%llx\t0x%llx\t0x%x\n", 898 prange, prange->start, prange->npages, 899 prange->start + prange->npages - 1, 900 prange->actual_loc); 901 node = interval_tree_iter_next(node, 0, ~0ULL); 902 } 903 } 904 905 static void * 906 svm_range_copy_array(void *psrc, size_t size, uint64_t num_elements, 907 uint64_t offset, uint64_t *vram_pages) 908 { 909 unsigned char *src = (unsigned char *)psrc + offset; 910 unsigned char *dst; 911 uint64_t i; 912 913 dst = kvmalloc_array(num_elements, size, GFP_KERNEL); 914 if (!dst) 915 return NULL; 916 917 if (!vram_pages) { 918 memcpy(dst, src, num_elements * size); 919 return (void *)dst; 920 } 921 922 *vram_pages = 0; 923 for (i = 0; i < num_elements; i++) { 924 dma_addr_t *temp; 925 temp = (dma_addr_t *)dst + i; 926 *temp = *((dma_addr_t *)src + i); 927 if (*temp&SVM_RANGE_VRAM_DOMAIN) 928 (*vram_pages)++; 929 } 930 931 return (void *)dst; 932 } 933 934 static int 935 svm_range_copy_dma_addrs(struct svm_range *dst, struct svm_range *src) 936 { 937 int i; 938 939 for (i = 0; i < MAX_GPU_INSTANCE; i++) { 940 if (!src->dma_addr[i]) 941 continue; 942 dst->dma_addr[i] = svm_range_copy_array(src->dma_addr[i], 943 sizeof(*src->dma_addr[i]), src->npages, 0, NULL); 944 if (!dst->dma_addr[i]) 945 return -ENOMEM; 946 } 947 948 return 0; 949 } 950 951 static int 952 svm_range_split_array(void *ppnew, void *ppold, size_t size, 953 uint64_t old_start, uint64_t old_n, 954 uint64_t new_start, uint64_t new_n, uint64_t *new_vram_pages) 955 { 956 unsigned char *new, *old, *pold; 957 uint64_t d; 958 959 if (!ppold) 960 return 0; 961 pold = *(unsigned char **)ppold; 962 if (!pold) 963 return 0; 964 965 d = (new_start - old_start) * size; 966 /* get dma addr array for new range and calculte its vram page number */ 967 new = svm_range_copy_array(pold, size, new_n, d, new_vram_pages); 968 if (!new) 969 return -ENOMEM; 970 d = (new_start == old_start) ? new_n * size : 0; 971 old = svm_range_copy_array(pold, size, old_n, d, NULL); 972 if (!old) { 973 kvfree(new); 974 return -ENOMEM; 975 } 976 kvfree(pold); 977 *(void **)ppold = old; 978 *(void **)ppnew = new; 979 980 return 0; 981 } 982 983 static int 984 svm_range_split_pages(struct svm_range *new, struct svm_range *old, 985 uint64_t start, uint64_t last) 986 { 987 uint64_t npages = last - start + 1; 988 int i, r; 989 990 for (i = 0; i < MAX_GPU_INSTANCE; i++) { 991 r = svm_range_split_array(&new->dma_addr[i], &old->dma_addr[i], 992 sizeof(*old->dma_addr[i]), old->start, 993 npages, new->start, new->npages, 994 old->actual_loc ? &new->vram_pages : NULL); 995 if (r) 996 return r; 997 } 998 if (old->actual_loc) 999 old->vram_pages -= new->vram_pages; 1000 1001 return 0; 1002 } 1003 1004 static int 1005 svm_range_split_nodes(struct svm_range *new, struct svm_range *old, 1006 uint64_t start, uint64_t last) 1007 { 1008 uint64_t npages = last - start + 1; 1009 1010 pr_debug("svms 0x%p new prange 0x%p start 0x%lx [0x%llx 0x%llx]\n", 1011 new->svms, new, new->start, start, last); 1012 1013 if (new->start == old->start) { 1014 new->offset = old->offset; 1015 old->offset += new->npages; 1016 } else { 1017 new->offset = old->offset + npages; 1018 } 1019 1020 new->svm_bo = svm_range_bo_ref(old->svm_bo); 1021 new->ttm_res = old->ttm_res; 1022 1023 spin_lock(&new->svm_bo->list_lock); 1024 list_add(&new->svm_bo_list, &new->svm_bo->range_list); 1025 spin_unlock(&new->svm_bo->list_lock); 1026 1027 return 0; 1028 } 1029 1030 /** 1031 * svm_range_split_adjust - split range and adjust 1032 * 1033 * @new: new range 1034 * @old: the old range 1035 * @start: the old range adjust to start address in pages 1036 * @last: the old range adjust to last address in pages 1037 * 1038 * Copy system memory dma_addr or vram ttm_res in old range to new 1039 * range from new_start up to size new->npages, the remaining old range is from 1040 * start to last 1041 * 1042 * Return: 1043 * 0 - OK, -ENOMEM - out of memory 1044 */ 1045 static int 1046 svm_range_split_adjust(struct svm_range *new, struct svm_range *old, 1047 uint64_t start, uint64_t last) 1048 { 1049 int r; 1050 1051 pr_debug("svms 0x%p new 0x%lx old [0x%lx 0x%lx] => [0x%llx 0x%llx]\n", 1052 new->svms, new->start, old->start, old->last, start, last); 1053 1054 if (new->start < old->start || 1055 new->last > old->last) { 1056 WARN_ONCE(1, "invalid new range start or last\n"); 1057 return -EINVAL; 1058 } 1059 1060 r = svm_range_split_pages(new, old, start, last); 1061 if (r) 1062 return r; 1063 1064 if (old->actual_loc && old->ttm_res) { 1065 r = svm_range_split_nodes(new, old, start, last); 1066 if (r) 1067 return r; 1068 } 1069 1070 old->npages = last - start + 1; 1071 old->start = start; 1072 old->last = last; 1073 new->flags = old->flags; 1074 new->preferred_loc = old->preferred_loc; 1075 new->prefetch_loc = old->prefetch_loc; 1076 new->actual_loc = old->actual_loc; 1077 new->granularity = old->granularity; 1078 new->mapped_to_gpu = old->mapped_to_gpu; 1079 bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE); 1080 bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE); 1081 atomic_set(&new->queue_refcount, atomic_read(&old->queue_refcount)); 1082 1083 return 0; 1084 } 1085 1086 /** 1087 * svm_range_split - split a range in 2 ranges 1088 * 1089 * @prange: the svm range to split 1090 * @start: the remaining range start address in pages 1091 * @last: the remaining range last address in pages 1092 * @new: the result new range generated 1093 * 1094 * Two cases only: 1095 * case 1: if start == prange->start 1096 * prange ==> prange[start, last] 1097 * new range [last + 1, prange->last] 1098 * 1099 * case 2: if last == prange->last 1100 * prange ==> prange[start, last] 1101 * new range [prange->start, start - 1] 1102 * 1103 * Return: 1104 * 0 - OK, -ENOMEM - out of memory, -EINVAL - invalid start, last 1105 */ 1106 static int 1107 svm_range_split(struct svm_range *prange, uint64_t start, uint64_t last, 1108 struct svm_range **new) 1109 { 1110 uint64_t old_start = prange->start; 1111 uint64_t old_last = prange->last; 1112 struct svm_range_list *svms; 1113 int r = 0; 1114 1115 pr_debug("svms 0x%p [0x%llx 0x%llx] to [0x%llx 0x%llx]\n", prange->svms, 1116 old_start, old_last, start, last); 1117 1118 if (old_start != start && old_last != last) 1119 return -EINVAL; 1120 if (start < old_start || last > old_last) 1121 return -EINVAL; 1122 1123 svms = prange->svms; 1124 if (old_start == start) 1125 *new = svm_range_new(svms, last + 1, old_last, false); 1126 else 1127 *new = svm_range_new(svms, old_start, start - 1, false); 1128 if (!*new) 1129 return -ENOMEM; 1130 1131 r = svm_range_split_adjust(*new, prange, start, last); 1132 if (r) { 1133 pr_debug("failed %d split [0x%llx 0x%llx] to [0x%llx 0x%llx]\n", 1134 r, old_start, old_last, start, last); 1135 svm_range_free(*new, false); 1136 *new = NULL; 1137 } 1138 1139 return r; 1140 } 1141 1142 static int 1143 svm_range_split_tail(struct svm_range *prange, uint64_t new_last, 1144 struct list_head *insert_list, struct list_head *remap_list) 1145 { 1146 struct svm_range *tail = NULL; 1147 int r = svm_range_split(prange, prange->start, new_last, &tail); 1148 1149 if (!r) { 1150 list_add(&tail->list, insert_list); 1151 if (!IS_ALIGNED(new_last + 1, 1UL << prange->granularity)) 1152 list_add(&tail->update_list, remap_list); 1153 } 1154 return r; 1155 } 1156 1157 static int 1158 svm_range_split_head(struct svm_range *prange, uint64_t new_start, 1159 struct list_head *insert_list, struct list_head *remap_list) 1160 { 1161 struct svm_range *head = NULL; 1162 int r = svm_range_split(prange, new_start, prange->last, &head); 1163 1164 if (!r) { 1165 list_add(&head->list, insert_list); 1166 if (!IS_ALIGNED(new_start, 1UL << prange->granularity)) 1167 list_add(&head->update_list, remap_list); 1168 } 1169 return r; 1170 } 1171 1172 static void 1173 svm_range_add_child(struct svm_range *prange, struct mm_struct *mm, 1174 struct svm_range *pchild, enum svm_work_list_ops op) 1175 { 1176 pr_debug("add child 0x%p [0x%lx 0x%lx] to prange 0x%p child list %d\n", 1177 pchild, pchild->start, pchild->last, prange, op); 1178 1179 pchild->work_item.mm = mm; 1180 pchild->work_item.op = op; 1181 list_add_tail(&pchild->child_list, &prange->child_list); 1182 } 1183 1184 static bool 1185 svm_nodes_in_same_hive(struct kfd_node *node_a, struct kfd_node *node_b) 1186 { 1187 return (node_a->adev == node_b->adev || 1188 amdgpu_xgmi_same_hive(node_a->adev, node_b->adev)); 1189 } 1190 1191 static uint64_t 1192 svm_range_get_pte_flags(struct kfd_node *node, 1193 struct svm_range *prange, int domain) 1194 { 1195 struct kfd_node *bo_node; 1196 uint32_t flags = prange->flags; 1197 uint32_t mapping_flags = 0; 1198 uint64_t pte_flags; 1199 bool snoop = (domain != SVM_RANGE_VRAM_DOMAIN); 1200 bool coherent = flags & (KFD_IOCTL_SVM_FLAG_COHERENT | KFD_IOCTL_SVM_FLAG_EXT_COHERENT); 1201 bool ext_coherent = flags & KFD_IOCTL_SVM_FLAG_EXT_COHERENT; 1202 unsigned int mtype_local; 1203 1204 if (domain == SVM_RANGE_VRAM_DOMAIN) 1205 bo_node = prange->svm_bo->node; 1206 1207 switch (amdgpu_ip_version(node->adev, GC_HWIP, 0)) { 1208 case IP_VERSION(9, 4, 1): 1209 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1210 if (bo_node == node) { 1211 mapping_flags |= coherent ? 1212 AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW; 1213 } else { 1214 mapping_flags |= coherent ? 1215 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1216 if (svm_nodes_in_same_hive(node, bo_node)) 1217 snoop = true; 1218 } 1219 } else { 1220 mapping_flags |= coherent ? 1221 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1222 } 1223 break; 1224 case IP_VERSION(9, 4, 2): 1225 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1226 if (bo_node == node) { 1227 mapping_flags |= coherent ? 1228 AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW; 1229 if (node->adev->gmc.xgmi.connected_to_cpu) 1230 snoop = true; 1231 } else { 1232 mapping_flags |= coherent ? 1233 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1234 if (svm_nodes_in_same_hive(node, bo_node)) 1235 snoop = true; 1236 } 1237 } else { 1238 mapping_flags |= coherent ? 1239 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1240 } 1241 break; 1242 case IP_VERSION(9, 4, 3): 1243 case IP_VERSION(9, 4, 4): 1244 if (ext_coherent) 1245 mtype_local = node->adev->rev_id ? AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_UC; 1246 else 1247 mtype_local = amdgpu_mtype_local == 1 ? AMDGPU_VM_MTYPE_NC : 1248 amdgpu_mtype_local == 2 ? AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW; 1249 snoop = true; 1250 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1251 /* local HBM region close to partition */ 1252 if (bo_node->adev == node->adev && 1253 (!bo_node->xcp || !node->xcp || bo_node->xcp->mem_id == node->xcp->mem_id)) 1254 mapping_flags |= mtype_local; 1255 /* local HBM region far from partition or remote XGMI GPU 1256 * with regular system scope coherence 1257 */ 1258 else if (svm_nodes_in_same_hive(bo_node, node) && !ext_coherent) 1259 mapping_flags |= AMDGPU_VM_MTYPE_NC; 1260 /* PCIe P2P or extended system scope coherence */ 1261 else 1262 mapping_flags |= AMDGPU_VM_MTYPE_UC; 1263 /* system memory accessed by the APU */ 1264 } else if (node->adev->flags & AMD_IS_APU) { 1265 /* On NUMA systems, locality is determined per-page 1266 * in amdgpu_gmc_override_vm_pte_flags 1267 */ 1268 if (num_possible_nodes() <= 1) 1269 mapping_flags |= mtype_local; 1270 else 1271 mapping_flags |= ext_coherent ? AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1272 /* system memory accessed by the dGPU */ 1273 } else { 1274 mapping_flags |= AMDGPU_VM_MTYPE_UC; 1275 } 1276 break; 1277 case IP_VERSION(12, 0, 0): 1278 case IP_VERSION(12, 0, 1): 1279 if (domain == SVM_RANGE_VRAM_DOMAIN) { 1280 if (bo_node != node) 1281 mapping_flags |= AMDGPU_VM_MTYPE_NC; 1282 } else { 1283 mapping_flags |= coherent ? 1284 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1285 } 1286 break; 1287 default: 1288 mapping_flags |= coherent ? 1289 AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC; 1290 } 1291 1292 mapping_flags |= AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE; 1293 1294 if (flags & KFD_IOCTL_SVM_FLAG_GPU_RO) 1295 mapping_flags &= ~AMDGPU_VM_PAGE_WRITEABLE; 1296 if (flags & KFD_IOCTL_SVM_FLAG_GPU_EXEC) 1297 mapping_flags |= AMDGPU_VM_PAGE_EXECUTABLE; 1298 1299 pte_flags = AMDGPU_PTE_VALID; 1300 pte_flags |= (domain == SVM_RANGE_VRAM_DOMAIN) ? 0 : AMDGPU_PTE_SYSTEM; 1301 pte_flags |= snoop ? AMDGPU_PTE_SNOOPED : 0; 1302 if (KFD_GC_VERSION(node) >= IP_VERSION(12, 0, 0)) 1303 pte_flags |= AMDGPU_PTE_IS_PTE; 1304 1305 pte_flags |= amdgpu_gem_va_map_flags(node->adev, mapping_flags); 1306 return pte_flags; 1307 } 1308 1309 static int 1310 svm_range_unmap_from_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm, 1311 uint64_t start, uint64_t last, 1312 struct dma_fence **fence) 1313 { 1314 uint64_t init_pte_value = 0; 1315 1316 pr_debug("[0x%llx 0x%llx]\n", start, last); 1317 1318 return amdgpu_vm_update_range(adev, vm, false, true, true, false, NULL, start, 1319 last, init_pte_value, 0, 0, NULL, NULL, 1320 fence); 1321 } 1322 1323 static int 1324 svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start, 1325 unsigned long last, uint32_t trigger) 1326 { 1327 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 1328 struct kfd_process_device *pdd; 1329 struct dma_fence *fence = NULL; 1330 struct kfd_process *p; 1331 uint32_t gpuidx; 1332 int r = 0; 1333 1334 if (!prange->mapped_to_gpu) { 1335 pr_debug("prange 0x%p [0x%lx 0x%lx] not mapped to GPU\n", 1336 prange, prange->start, prange->last); 1337 return 0; 1338 } 1339 1340 if (prange->start == start && prange->last == last) { 1341 pr_debug("unmap svms 0x%p prange 0x%p\n", prange->svms, prange); 1342 prange->mapped_to_gpu = false; 1343 } 1344 1345 bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip, 1346 MAX_GPU_INSTANCE); 1347 p = container_of(prange->svms, struct kfd_process, svms); 1348 1349 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 1350 pr_debug("unmap from gpu idx 0x%x\n", gpuidx); 1351 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1352 if (!pdd) { 1353 pr_debug("failed to find device idx %d\n", gpuidx); 1354 return -EINVAL; 1355 } 1356 1357 kfd_smi_event_unmap_from_gpu(pdd->dev, p->lead_thread->pid, 1358 start, last, trigger); 1359 1360 r = svm_range_unmap_from_gpu(pdd->dev->adev, 1361 drm_priv_to_vm(pdd->drm_priv), 1362 start, last, &fence); 1363 if (r) 1364 break; 1365 1366 if (fence) { 1367 r = dma_fence_wait(fence, false); 1368 dma_fence_put(fence); 1369 fence = NULL; 1370 if (r) 1371 break; 1372 } 1373 kfd_flush_tlb(pdd, TLB_FLUSH_HEAVYWEIGHT); 1374 } 1375 1376 return r; 1377 } 1378 1379 static int 1380 svm_range_map_to_gpu(struct kfd_process_device *pdd, struct svm_range *prange, 1381 unsigned long offset, unsigned long npages, bool readonly, 1382 dma_addr_t *dma_addr, struct amdgpu_device *bo_adev, 1383 struct dma_fence **fence, bool flush_tlb) 1384 { 1385 struct amdgpu_device *adev = pdd->dev->adev; 1386 struct amdgpu_vm *vm = drm_priv_to_vm(pdd->drm_priv); 1387 uint64_t pte_flags; 1388 unsigned long last_start; 1389 int last_domain; 1390 int r = 0; 1391 int64_t i, j; 1392 1393 last_start = prange->start + offset; 1394 1395 pr_debug("svms 0x%p [0x%lx 0x%lx] readonly %d\n", prange->svms, 1396 last_start, last_start + npages - 1, readonly); 1397 1398 for (i = offset; i < offset + npages; i++) { 1399 last_domain = dma_addr[i] & SVM_RANGE_VRAM_DOMAIN; 1400 dma_addr[i] &= ~SVM_RANGE_VRAM_DOMAIN; 1401 1402 /* Collect all pages in the same address range and memory domain 1403 * that can be mapped with a single call to update mapping. 1404 */ 1405 if (i < offset + npages - 1 && 1406 last_domain == (dma_addr[i + 1] & SVM_RANGE_VRAM_DOMAIN)) 1407 continue; 1408 1409 pr_debug("Mapping range [0x%lx 0x%llx] on domain: %s\n", 1410 last_start, prange->start + i, last_domain ? "GPU" : "CPU"); 1411 1412 pte_flags = svm_range_get_pte_flags(pdd->dev, prange, last_domain); 1413 if (readonly) 1414 pte_flags &= ~AMDGPU_PTE_WRITEABLE; 1415 1416 pr_debug("svms 0x%p map [0x%lx 0x%llx] vram %d PTE 0x%llx\n", 1417 prange->svms, last_start, prange->start + i, 1418 (last_domain == SVM_RANGE_VRAM_DOMAIN) ? 1 : 0, 1419 pte_flags); 1420 1421 /* For dGPU mode, we use same vm_manager to allocate VRAM for 1422 * different memory partition based on fpfn/lpfn, we should use 1423 * same vm_manager.vram_base_offset regardless memory partition. 1424 */ 1425 r = amdgpu_vm_update_range(adev, vm, false, false, flush_tlb, true, 1426 NULL, last_start, prange->start + i, 1427 pte_flags, 1428 (last_start - prange->start) << PAGE_SHIFT, 1429 bo_adev ? bo_adev->vm_manager.vram_base_offset : 0, 1430 NULL, dma_addr, &vm->last_update); 1431 1432 for (j = last_start - prange->start; j <= i; j++) 1433 dma_addr[j] |= last_domain; 1434 1435 if (r) { 1436 pr_debug("failed %d to map to gpu 0x%lx\n", r, prange->start); 1437 goto out; 1438 } 1439 last_start = prange->start + i + 1; 1440 } 1441 1442 r = amdgpu_vm_update_pdes(adev, vm, false); 1443 if (r) { 1444 pr_debug("failed %d to update directories 0x%lx\n", r, 1445 prange->start); 1446 goto out; 1447 } 1448 1449 if (fence) 1450 *fence = dma_fence_get(vm->last_update); 1451 1452 out: 1453 return r; 1454 } 1455 1456 static int 1457 svm_range_map_to_gpus(struct svm_range *prange, unsigned long offset, 1458 unsigned long npages, bool readonly, 1459 unsigned long *bitmap, bool wait, bool flush_tlb) 1460 { 1461 struct kfd_process_device *pdd; 1462 struct amdgpu_device *bo_adev = NULL; 1463 struct kfd_process *p; 1464 struct dma_fence *fence = NULL; 1465 uint32_t gpuidx; 1466 int r = 0; 1467 1468 if (prange->svm_bo && prange->ttm_res) 1469 bo_adev = prange->svm_bo->node->adev; 1470 1471 p = container_of(prange->svms, struct kfd_process, svms); 1472 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 1473 pr_debug("mapping to gpu idx 0x%x\n", gpuidx); 1474 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1475 if (!pdd) { 1476 pr_debug("failed to find device idx %d\n", gpuidx); 1477 return -EINVAL; 1478 } 1479 1480 pdd = kfd_bind_process_to_device(pdd->dev, p); 1481 if (IS_ERR(pdd)) 1482 return -EINVAL; 1483 1484 if (bo_adev && pdd->dev->adev != bo_adev && 1485 !amdgpu_xgmi_same_hive(pdd->dev->adev, bo_adev)) { 1486 pr_debug("cannot map to device idx %d\n", gpuidx); 1487 continue; 1488 } 1489 1490 r = svm_range_map_to_gpu(pdd, prange, offset, npages, readonly, 1491 prange->dma_addr[gpuidx], 1492 bo_adev, wait ? &fence : NULL, 1493 flush_tlb); 1494 if (r) 1495 break; 1496 1497 if (fence) { 1498 r = dma_fence_wait(fence, false); 1499 dma_fence_put(fence); 1500 fence = NULL; 1501 if (r) { 1502 pr_debug("failed %d to dma fence wait\n", r); 1503 break; 1504 } 1505 } 1506 1507 kfd_flush_tlb(pdd, TLB_FLUSH_LEGACY); 1508 } 1509 1510 return r; 1511 } 1512 1513 struct svm_validate_context { 1514 struct kfd_process *process; 1515 struct svm_range *prange; 1516 bool intr; 1517 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 1518 struct drm_exec exec; 1519 }; 1520 1521 static int svm_range_reserve_bos(struct svm_validate_context *ctx, bool intr) 1522 { 1523 struct kfd_process_device *pdd; 1524 struct amdgpu_vm *vm; 1525 uint32_t gpuidx; 1526 int r; 1527 1528 drm_exec_init(&ctx->exec, intr ? DRM_EXEC_INTERRUPTIBLE_WAIT: 0, 0); 1529 drm_exec_until_all_locked(&ctx->exec) { 1530 for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) { 1531 pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx); 1532 if (!pdd) { 1533 pr_debug("failed to find device idx %d\n", gpuidx); 1534 r = -EINVAL; 1535 goto unreserve_out; 1536 } 1537 vm = drm_priv_to_vm(pdd->drm_priv); 1538 1539 r = amdgpu_vm_lock_pd(vm, &ctx->exec, 2); 1540 drm_exec_retry_on_contention(&ctx->exec); 1541 if (unlikely(r)) { 1542 pr_debug("failed %d to reserve bo\n", r); 1543 goto unreserve_out; 1544 } 1545 } 1546 } 1547 1548 for_each_set_bit(gpuidx, ctx->bitmap, MAX_GPU_INSTANCE) { 1549 pdd = kfd_process_device_from_gpuidx(ctx->process, gpuidx); 1550 if (!pdd) { 1551 pr_debug("failed to find device idx %d\n", gpuidx); 1552 r = -EINVAL; 1553 goto unreserve_out; 1554 } 1555 1556 r = amdgpu_vm_validate(pdd->dev->adev, 1557 drm_priv_to_vm(pdd->drm_priv), NULL, 1558 svm_range_bo_validate, NULL); 1559 if (r) { 1560 pr_debug("failed %d validate pt bos\n", r); 1561 goto unreserve_out; 1562 } 1563 } 1564 1565 return 0; 1566 1567 unreserve_out: 1568 drm_exec_fini(&ctx->exec); 1569 return r; 1570 } 1571 1572 static void svm_range_unreserve_bos(struct svm_validate_context *ctx) 1573 { 1574 drm_exec_fini(&ctx->exec); 1575 } 1576 1577 static void *kfd_svm_page_owner(struct kfd_process *p, int32_t gpuidx) 1578 { 1579 struct kfd_process_device *pdd; 1580 1581 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 1582 if (!pdd) 1583 return NULL; 1584 1585 return SVM_ADEV_PGMAP_OWNER(pdd->dev->adev); 1586 } 1587 1588 /* 1589 * Validation+GPU mapping with concurrent invalidation (MMU notifiers) 1590 * 1591 * To prevent concurrent destruction or change of range attributes, the 1592 * svm_read_lock must be held. The caller must not hold the svm_write_lock 1593 * because that would block concurrent evictions and lead to deadlocks. To 1594 * serialize concurrent migrations or validations of the same range, the 1595 * prange->migrate_mutex must be held. 1596 * 1597 * For VRAM ranges, the SVM BO must be allocated and valid (protected by its 1598 * eviction fence. 1599 * 1600 * The following sequence ensures race-free validation and GPU mapping: 1601 * 1602 * 1. Reserve page table (and SVM BO if range is in VRAM) 1603 * 2. hmm_range_fault to get page addresses (if system memory) 1604 * 3. DMA-map pages (if system memory) 1605 * 4-a. Take notifier lock 1606 * 4-b. Check that pages still valid (mmu_interval_read_retry) 1607 * 4-c. Check that the range was not split or otherwise invalidated 1608 * 4-d. Update GPU page table 1609 * 4.e. Release notifier lock 1610 * 5. Release page table (and SVM BO) reservation 1611 */ 1612 static int svm_range_validate_and_map(struct mm_struct *mm, 1613 unsigned long map_start, unsigned long map_last, 1614 struct svm_range *prange, int32_t gpuidx, 1615 bool intr, bool wait, bool flush_tlb) 1616 { 1617 struct svm_validate_context *ctx; 1618 unsigned long start, end, addr; 1619 struct kfd_process *p; 1620 void *owner; 1621 int32_t idx; 1622 int r = 0; 1623 1624 ctx = kzalloc(sizeof(struct svm_validate_context), GFP_KERNEL); 1625 if (!ctx) 1626 return -ENOMEM; 1627 ctx->process = container_of(prange->svms, struct kfd_process, svms); 1628 ctx->prange = prange; 1629 ctx->intr = intr; 1630 1631 if (gpuidx < MAX_GPU_INSTANCE) { 1632 bitmap_zero(ctx->bitmap, MAX_GPU_INSTANCE); 1633 bitmap_set(ctx->bitmap, gpuidx, 1); 1634 } else if (ctx->process->xnack_enabled) { 1635 bitmap_copy(ctx->bitmap, prange->bitmap_aip, MAX_GPU_INSTANCE); 1636 1637 /* If prefetch range to GPU, or GPU retry fault migrate range to 1638 * GPU, which has ACCESS attribute to the range, create mapping 1639 * on that GPU. 1640 */ 1641 if (prange->actual_loc) { 1642 gpuidx = kfd_process_gpuidx_from_gpuid(ctx->process, 1643 prange->actual_loc); 1644 if (gpuidx < 0) { 1645 WARN_ONCE(1, "failed get device by id 0x%x\n", 1646 prange->actual_loc); 1647 r = -EINVAL; 1648 goto free_ctx; 1649 } 1650 if (test_bit(gpuidx, prange->bitmap_access)) 1651 bitmap_set(ctx->bitmap, gpuidx, 1); 1652 } 1653 1654 /* 1655 * If prange is already mapped or with always mapped flag, 1656 * update mapping on GPUs with ACCESS attribute 1657 */ 1658 if (bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) { 1659 if (prange->mapped_to_gpu || 1660 prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED) 1661 bitmap_copy(ctx->bitmap, prange->bitmap_access, MAX_GPU_INSTANCE); 1662 } 1663 } else { 1664 bitmap_or(ctx->bitmap, prange->bitmap_access, 1665 prange->bitmap_aip, MAX_GPU_INSTANCE); 1666 } 1667 1668 if (bitmap_empty(ctx->bitmap, MAX_GPU_INSTANCE)) { 1669 r = 0; 1670 goto free_ctx; 1671 } 1672 1673 if (prange->actual_loc && !prange->ttm_res) { 1674 /* This should never happen. actual_loc gets set by 1675 * svm_migrate_ram_to_vram after allocating a BO. 1676 */ 1677 WARN_ONCE(1, "VRAM BO missing during validation\n"); 1678 r = -EINVAL; 1679 goto free_ctx; 1680 } 1681 1682 r = svm_range_reserve_bos(ctx, intr); 1683 if (r) 1684 goto free_ctx; 1685 1686 p = container_of(prange->svms, struct kfd_process, svms); 1687 owner = kfd_svm_page_owner(p, find_first_bit(ctx->bitmap, 1688 MAX_GPU_INSTANCE)); 1689 for_each_set_bit(idx, ctx->bitmap, MAX_GPU_INSTANCE) { 1690 if (kfd_svm_page_owner(p, idx) != owner) { 1691 owner = NULL; 1692 break; 1693 } 1694 } 1695 1696 start = map_start << PAGE_SHIFT; 1697 end = (map_last + 1) << PAGE_SHIFT; 1698 for (addr = start; !r && addr < end; ) { 1699 struct hmm_range *hmm_range = NULL; 1700 unsigned long map_start_vma; 1701 unsigned long map_last_vma; 1702 struct vm_area_struct *vma; 1703 unsigned long next = 0; 1704 unsigned long offset; 1705 unsigned long npages; 1706 bool readonly; 1707 1708 vma = vma_lookup(mm, addr); 1709 if (vma) { 1710 readonly = !(vma->vm_flags & VM_WRITE); 1711 1712 next = min(vma->vm_end, end); 1713 npages = (next - addr) >> PAGE_SHIFT; 1714 WRITE_ONCE(p->svms.faulting_task, current); 1715 r = amdgpu_hmm_range_get_pages(&prange->notifier, addr, npages, 1716 readonly, owner, NULL, 1717 &hmm_range); 1718 WRITE_ONCE(p->svms.faulting_task, NULL); 1719 if (r) 1720 pr_debug("failed %d to get svm range pages\n", r); 1721 } else { 1722 r = -EFAULT; 1723 } 1724 1725 if (!r) { 1726 offset = (addr >> PAGE_SHIFT) - prange->start; 1727 r = svm_range_dma_map(prange, ctx->bitmap, offset, npages, 1728 hmm_range->hmm_pfns); 1729 if (r) 1730 pr_debug("failed %d to dma map range\n", r); 1731 } 1732 1733 svm_range_lock(prange); 1734 1735 /* Free backing memory of hmm_range if it was initialized 1736 * Overrride return value to TRY AGAIN only if prior returns 1737 * were successful 1738 */ 1739 if (hmm_range && amdgpu_hmm_range_get_pages_done(hmm_range) && !r) { 1740 pr_debug("hmm update the range, need validate again\n"); 1741 r = -EAGAIN; 1742 } 1743 1744 if (!r && !list_empty(&prange->child_list)) { 1745 pr_debug("range split by unmap in parallel, validate again\n"); 1746 r = -EAGAIN; 1747 } 1748 1749 if (!r) { 1750 map_start_vma = max(map_start, prange->start + offset); 1751 map_last_vma = min(map_last, prange->start + offset + npages - 1); 1752 if (map_start_vma <= map_last_vma) { 1753 offset = map_start_vma - prange->start; 1754 npages = map_last_vma - map_start_vma + 1; 1755 r = svm_range_map_to_gpus(prange, offset, npages, readonly, 1756 ctx->bitmap, wait, flush_tlb); 1757 } 1758 } 1759 1760 if (!r && next == end) 1761 prange->mapped_to_gpu = true; 1762 1763 svm_range_unlock(prange); 1764 1765 addr = next; 1766 } 1767 1768 svm_range_unreserve_bos(ctx); 1769 if (!r) 1770 prange->validate_timestamp = ktime_get_boottime(); 1771 1772 free_ctx: 1773 kfree(ctx); 1774 1775 return r; 1776 } 1777 1778 /** 1779 * svm_range_list_lock_and_flush_work - flush pending deferred work 1780 * 1781 * @svms: the svm range list 1782 * @mm: the mm structure 1783 * 1784 * Context: Returns with mmap write lock held, pending deferred work flushed 1785 * 1786 */ 1787 void 1788 svm_range_list_lock_and_flush_work(struct svm_range_list *svms, 1789 struct mm_struct *mm) 1790 { 1791 retry_flush_work: 1792 flush_work(&svms->deferred_list_work); 1793 mmap_write_lock(mm); 1794 1795 if (list_empty(&svms->deferred_range_list)) 1796 return; 1797 mmap_write_unlock(mm); 1798 pr_debug("retry flush\n"); 1799 goto retry_flush_work; 1800 } 1801 1802 static void svm_range_restore_work(struct work_struct *work) 1803 { 1804 struct delayed_work *dwork = to_delayed_work(work); 1805 struct amdkfd_process_info *process_info; 1806 struct svm_range_list *svms; 1807 struct svm_range *prange; 1808 struct kfd_process *p; 1809 struct mm_struct *mm; 1810 int evicted_ranges; 1811 int invalid; 1812 int r; 1813 1814 svms = container_of(dwork, struct svm_range_list, restore_work); 1815 evicted_ranges = atomic_read(&svms->evicted_ranges); 1816 if (!evicted_ranges) 1817 return; 1818 1819 pr_debug("restore svm ranges\n"); 1820 1821 p = container_of(svms, struct kfd_process, svms); 1822 process_info = p->kgd_process_info; 1823 1824 /* Keep mm reference when svm_range_validate_and_map ranges */ 1825 mm = get_task_mm(p->lead_thread); 1826 if (!mm) { 1827 pr_debug("svms 0x%p process mm gone\n", svms); 1828 return; 1829 } 1830 1831 mutex_lock(&process_info->lock); 1832 svm_range_list_lock_and_flush_work(svms, mm); 1833 mutex_lock(&svms->lock); 1834 1835 evicted_ranges = atomic_read(&svms->evicted_ranges); 1836 1837 list_for_each_entry(prange, &svms->list, list) { 1838 invalid = atomic_read(&prange->invalid); 1839 if (!invalid) 1840 continue; 1841 1842 pr_debug("restoring svms 0x%p prange 0x%p [0x%lx %lx] inv %d\n", 1843 prange->svms, prange, prange->start, prange->last, 1844 invalid); 1845 1846 /* 1847 * If range is migrating, wait for migration is done. 1848 */ 1849 mutex_lock(&prange->migrate_mutex); 1850 1851 r = svm_range_validate_and_map(mm, prange->start, prange->last, prange, 1852 MAX_GPU_INSTANCE, false, true, false); 1853 if (r) 1854 pr_debug("failed %d to map 0x%lx to gpus\n", r, 1855 prange->start); 1856 1857 mutex_unlock(&prange->migrate_mutex); 1858 if (r) 1859 goto out_reschedule; 1860 1861 if (atomic_cmpxchg(&prange->invalid, invalid, 0) != invalid) 1862 goto out_reschedule; 1863 } 1864 1865 if (atomic_cmpxchg(&svms->evicted_ranges, evicted_ranges, 0) != 1866 evicted_ranges) 1867 goto out_reschedule; 1868 1869 evicted_ranges = 0; 1870 1871 r = kgd2kfd_resume_mm(mm); 1872 if (r) { 1873 /* No recovery from this failure. Probably the CP is 1874 * hanging. No point trying again. 1875 */ 1876 pr_debug("failed %d to resume KFD\n", r); 1877 } 1878 1879 pr_debug("restore svm ranges successfully\n"); 1880 1881 out_reschedule: 1882 mutex_unlock(&svms->lock); 1883 mmap_write_unlock(mm); 1884 mutex_unlock(&process_info->lock); 1885 1886 /* If validation failed, reschedule another attempt */ 1887 if (evicted_ranges) { 1888 pr_debug("reschedule to restore svm range\n"); 1889 queue_delayed_work(system_freezable_wq, &svms->restore_work, 1890 msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS)); 1891 1892 kfd_smi_event_queue_restore_rescheduled(mm); 1893 } 1894 mmput(mm); 1895 } 1896 1897 /** 1898 * svm_range_evict - evict svm range 1899 * @prange: svm range structure 1900 * @mm: current process mm_struct 1901 * @start: starting process queue number 1902 * @last: last process queue number 1903 * @event: mmu notifier event when range is evicted or migrated 1904 * 1905 * Stop all queues of the process to ensure GPU doesn't access the memory, then 1906 * return to let CPU evict the buffer and proceed CPU pagetable update. 1907 * 1908 * Don't need use lock to sync cpu pagetable invalidation with GPU execution. 1909 * If invalidation happens while restore work is running, restore work will 1910 * restart to ensure to get the latest CPU pages mapping to GPU, then start 1911 * the queues. 1912 */ 1913 static int 1914 svm_range_evict(struct svm_range *prange, struct mm_struct *mm, 1915 unsigned long start, unsigned long last, 1916 enum mmu_notifier_event event) 1917 { 1918 struct svm_range_list *svms = prange->svms; 1919 struct svm_range *pchild; 1920 struct kfd_process *p; 1921 int r = 0; 1922 1923 p = container_of(svms, struct kfd_process, svms); 1924 1925 pr_debug("invalidate svms 0x%p prange [0x%lx 0x%lx] [0x%lx 0x%lx]\n", 1926 svms, prange->start, prange->last, start, last); 1927 1928 if (!p->xnack_enabled || 1929 (prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) { 1930 int evicted_ranges; 1931 bool mapped = prange->mapped_to_gpu; 1932 1933 list_for_each_entry(pchild, &prange->child_list, child_list) { 1934 if (!pchild->mapped_to_gpu) 1935 continue; 1936 mapped = true; 1937 mutex_lock_nested(&pchild->lock, 1); 1938 if (pchild->start <= last && pchild->last >= start) { 1939 pr_debug("increment pchild invalid [0x%lx 0x%lx]\n", 1940 pchild->start, pchild->last); 1941 atomic_inc(&pchild->invalid); 1942 } 1943 mutex_unlock(&pchild->lock); 1944 } 1945 1946 if (!mapped) 1947 return r; 1948 1949 if (prange->start <= last && prange->last >= start) 1950 atomic_inc(&prange->invalid); 1951 1952 evicted_ranges = atomic_inc_return(&svms->evicted_ranges); 1953 if (evicted_ranges != 1) 1954 return r; 1955 1956 pr_debug("evicting svms 0x%p range [0x%lx 0x%lx]\n", 1957 prange->svms, prange->start, prange->last); 1958 1959 /* First eviction, stop the queues */ 1960 r = kgd2kfd_quiesce_mm(mm, KFD_QUEUE_EVICTION_TRIGGER_SVM); 1961 if (r) 1962 pr_debug("failed to quiesce KFD\n"); 1963 1964 pr_debug("schedule to restore svm %p ranges\n", svms); 1965 queue_delayed_work(system_freezable_wq, &svms->restore_work, 1966 msecs_to_jiffies(AMDGPU_SVM_RANGE_RESTORE_DELAY_MS)); 1967 } else { 1968 unsigned long s, l; 1969 uint32_t trigger; 1970 1971 if (event == MMU_NOTIFY_MIGRATE) 1972 trigger = KFD_SVM_UNMAP_TRIGGER_MMU_NOTIFY_MIGRATE; 1973 else 1974 trigger = KFD_SVM_UNMAP_TRIGGER_MMU_NOTIFY; 1975 1976 pr_debug("invalidate unmap svms 0x%p [0x%lx 0x%lx] from GPUs\n", 1977 prange->svms, start, last); 1978 list_for_each_entry(pchild, &prange->child_list, child_list) { 1979 mutex_lock_nested(&pchild->lock, 1); 1980 s = max(start, pchild->start); 1981 l = min(last, pchild->last); 1982 if (l >= s) 1983 svm_range_unmap_from_gpus(pchild, s, l, trigger); 1984 mutex_unlock(&pchild->lock); 1985 } 1986 s = max(start, prange->start); 1987 l = min(last, prange->last); 1988 if (l >= s) 1989 svm_range_unmap_from_gpus(prange, s, l, trigger); 1990 } 1991 1992 return r; 1993 } 1994 1995 static struct svm_range *svm_range_clone(struct svm_range *old) 1996 { 1997 struct svm_range *new; 1998 1999 new = svm_range_new(old->svms, old->start, old->last, false); 2000 if (!new) 2001 return NULL; 2002 if (svm_range_copy_dma_addrs(new, old)) { 2003 svm_range_free(new, false); 2004 return NULL; 2005 } 2006 if (old->svm_bo) { 2007 new->ttm_res = old->ttm_res; 2008 new->offset = old->offset; 2009 new->svm_bo = svm_range_bo_ref(old->svm_bo); 2010 spin_lock(&new->svm_bo->list_lock); 2011 list_add(&new->svm_bo_list, &new->svm_bo->range_list); 2012 spin_unlock(&new->svm_bo->list_lock); 2013 } 2014 new->flags = old->flags; 2015 new->preferred_loc = old->preferred_loc; 2016 new->prefetch_loc = old->prefetch_loc; 2017 new->actual_loc = old->actual_loc; 2018 new->granularity = old->granularity; 2019 new->mapped_to_gpu = old->mapped_to_gpu; 2020 new->vram_pages = old->vram_pages; 2021 bitmap_copy(new->bitmap_access, old->bitmap_access, MAX_GPU_INSTANCE); 2022 bitmap_copy(new->bitmap_aip, old->bitmap_aip, MAX_GPU_INSTANCE); 2023 atomic_set(&new->queue_refcount, atomic_read(&old->queue_refcount)); 2024 2025 return new; 2026 } 2027 2028 void svm_range_set_max_pages(struct amdgpu_device *adev) 2029 { 2030 uint64_t max_pages; 2031 uint64_t pages, _pages; 2032 uint64_t min_pages = 0; 2033 int i, id; 2034 2035 for (i = 0; i < adev->kfd.dev->num_nodes; i++) { 2036 if (adev->kfd.dev->nodes[i]->xcp) 2037 id = adev->kfd.dev->nodes[i]->xcp->id; 2038 else 2039 id = -1; 2040 pages = KFD_XCP_MEMORY_SIZE(adev, id) >> 17; 2041 pages = clamp(pages, 1ULL << 9, 1ULL << 18); 2042 pages = rounddown_pow_of_two(pages); 2043 min_pages = min_not_zero(min_pages, pages); 2044 } 2045 2046 do { 2047 max_pages = READ_ONCE(max_svm_range_pages); 2048 _pages = min_not_zero(max_pages, min_pages); 2049 } while (cmpxchg(&max_svm_range_pages, max_pages, _pages) != max_pages); 2050 } 2051 2052 static int 2053 svm_range_split_new(struct svm_range_list *svms, uint64_t start, uint64_t last, 2054 uint64_t max_pages, struct list_head *insert_list, 2055 struct list_head *update_list) 2056 { 2057 struct svm_range *prange; 2058 uint64_t l; 2059 2060 pr_debug("max_svm_range_pages 0x%llx adding [0x%llx 0x%llx]\n", 2061 max_pages, start, last); 2062 2063 while (last >= start) { 2064 l = min(last, ALIGN_DOWN(start + max_pages, max_pages) - 1); 2065 2066 prange = svm_range_new(svms, start, l, true); 2067 if (!prange) 2068 return -ENOMEM; 2069 list_add(&prange->list, insert_list); 2070 list_add(&prange->update_list, update_list); 2071 2072 start = l + 1; 2073 } 2074 return 0; 2075 } 2076 2077 /** 2078 * svm_range_add - add svm range and handle overlap 2079 * @p: the range add to this process svms 2080 * @start: page size aligned 2081 * @size: page size aligned 2082 * @nattr: number of attributes 2083 * @attrs: array of attributes 2084 * @update_list: output, the ranges need validate and update GPU mapping 2085 * @insert_list: output, the ranges need insert to svms 2086 * @remove_list: output, the ranges are replaced and need remove from svms 2087 * @remap_list: output, remap unaligned svm ranges 2088 * 2089 * Check if the virtual address range has overlap with any existing ranges, 2090 * split partly overlapping ranges and add new ranges in the gaps. All changes 2091 * should be applied to the range_list and interval tree transactionally. If 2092 * any range split or allocation fails, the entire update fails. Therefore any 2093 * existing overlapping svm_ranges are cloned and the original svm_ranges left 2094 * unchanged. 2095 * 2096 * If the transaction succeeds, the caller can update and insert clones and 2097 * new ranges, then free the originals. 2098 * 2099 * Otherwise the caller can free the clones and new ranges, while the old 2100 * svm_ranges remain unchanged. 2101 * 2102 * Context: Process context, caller must hold svms->lock 2103 * 2104 * Return: 2105 * 0 - OK, otherwise error code 2106 */ 2107 static int 2108 svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size, 2109 uint32_t nattr, struct kfd_ioctl_svm_attribute *attrs, 2110 struct list_head *update_list, struct list_head *insert_list, 2111 struct list_head *remove_list, struct list_head *remap_list) 2112 { 2113 unsigned long last = start + size - 1UL; 2114 struct svm_range_list *svms = &p->svms; 2115 struct interval_tree_node *node; 2116 struct svm_range *prange; 2117 struct svm_range *tmp; 2118 struct list_head new_list; 2119 int r = 0; 2120 2121 pr_debug("svms 0x%p [0x%llx 0x%lx]\n", &p->svms, start, last); 2122 2123 INIT_LIST_HEAD(update_list); 2124 INIT_LIST_HEAD(insert_list); 2125 INIT_LIST_HEAD(remove_list); 2126 INIT_LIST_HEAD(&new_list); 2127 INIT_LIST_HEAD(remap_list); 2128 2129 node = interval_tree_iter_first(&svms->objects, start, last); 2130 while (node) { 2131 struct interval_tree_node *next; 2132 unsigned long next_start; 2133 2134 pr_debug("found overlap node [0x%lx 0x%lx]\n", node->start, 2135 node->last); 2136 2137 prange = container_of(node, struct svm_range, it_node); 2138 next = interval_tree_iter_next(node, start, last); 2139 next_start = min(node->last, last) + 1; 2140 2141 if (svm_range_is_same_attrs(p, prange, nattr, attrs) && 2142 prange->mapped_to_gpu) { 2143 /* nothing to do */ 2144 } else if (node->start < start || node->last > last) { 2145 /* node intersects the update range and its attributes 2146 * will change. Clone and split it, apply updates only 2147 * to the overlapping part 2148 */ 2149 struct svm_range *old = prange; 2150 2151 prange = svm_range_clone(old); 2152 if (!prange) { 2153 r = -ENOMEM; 2154 goto out; 2155 } 2156 2157 list_add(&old->update_list, remove_list); 2158 list_add(&prange->list, insert_list); 2159 list_add(&prange->update_list, update_list); 2160 2161 if (node->start < start) { 2162 pr_debug("change old range start\n"); 2163 r = svm_range_split_head(prange, start, 2164 insert_list, remap_list); 2165 if (r) 2166 goto out; 2167 } 2168 if (node->last > last) { 2169 pr_debug("change old range last\n"); 2170 r = svm_range_split_tail(prange, last, 2171 insert_list, remap_list); 2172 if (r) 2173 goto out; 2174 } 2175 } else { 2176 /* The node is contained within start..last, 2177 * just update it 2178 */ 2179 list_add(&prange->update_list, update_list); 2180 } 2181 2182 /* insert a new node if needed */ 2183 if (node->start > start) { 2184 r = svm_range_split_new(svms, start, node->start - 1, 2185 READ_ONCE(max_svm_range_pages), 2186 &new_list, update_list); 2187 if (r) 2188 goto out; 2189 } 2190 2191 node = next; 2192 start = next_start; 2193 } 2194 2195 /* add a final range at the end if needed */ 2196 if (start <= last) 2197 r = svm_range_split_new(svms, start, last, 2198 READ_ONCE(max_svm_range_pages), 2199 &new_list, update_list); 2200 2201 out: 2202 if (r) { 2203 list_for_each_entry_safe(prange, tmp, insert_list, list) 2204 svm_range_free(prange, false); 2205 list_for_each_entry_safe(prange, tmp, &new_list, list) 2206 svm_range_free(prange, true); 2207 } else { 2208 list_splice(&new_list, insert_list); 2209 } 2210 2211 return r; 2212 } 2213 2214 static void 2215 svm_range_update_notifier_and_interval_tree(struct mm_struct *mm, 2216 struct svm_range *prange) 2217 { 2218 unsigned long start; 2219 unsigned long last; 2220 2221 start = prange->notifier.interval_tree.start >> PAGE_SHIFT; 2222 last = prange->notifier.interval_tree.last >> PAGE_SHIFT; 2223 2224 if (prange->start == start && prange->last == last) 2225 return; 2226 2227 pr_debug("up notifier 0x%p prange 0x%p [0x%lx 0x%lx] [0x%lx 0x%lx]\n", 2228 prange->svms, prange, start, last, prange->start, 2229 prange->last); 2230 2231 if (start != 0 && last != 0) { 2232 interval_tree_remove(&prange->it_node, &prange->svms->objects); 2233 svm_range_remove_notifier(prange); 2234 } 2235 prange->it_node.start = prange->start; 2236 prange->it_node.last = prange->last; 2237 2238 interval_tree_insert(&prange->it_node, &prange->svms->objects); 2239 svm_range_add_notifier_locked(mm, prange); 2240 } 2241 2242 static void 2243 svm_range_handle_list_op(struct svm_range_list *svms, struct svm_range *prange, 2244 struct mm_struct *mm) 2245 { 2246 switch (prange->work_item.op) { 2247 case SVM_OP_NULL: 2248 pr_debug("NULL OP 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2249 svms, prange, prange->start, prange->last); 2250 break; 2251 case SVM_OP_UNMAP_RANGE: 2252 pr_debug("remove 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2253 svms, prange, prange->start, prange->last); 2254 svm_range_unlink(prange); 2255 svm_range_remove_notifier(prange); 2256 svm_range_free(prange, true); 2257 break; 2258 case SVM_OP_UPDATE_RANGE_NOTIFIER: 2259 pr_debug("update notifier 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2260 svms, prange, prange->start, prange->last); 2261 svm_range_update_notifier_and_interval_tree(mm, prange); 2262 break; 2263 case SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP: 2264 pr_debug("update and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", 2265 svms, prange, prange->start, prange->last); 2266 svm_range_update_notifier_and_interval_tree(mm, prange); 2267 /* TODO: implement deferred validation and mapping */ 2268 break; 2269 case SVM_OP_ADD_RANGE: 2270 pr_debug("add 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, prange, 2271 prange->start, prange->last); 2272 svm_range_add_to_svms(prange); 2273 svm_range_add_notifier_locked(mm, prange); 2274 break; 2275 case SVM_OP_ADD_RANGE_AND_MAP: 2276 pr_debug("add and map 0x%p prange 0x%p [0x%lx 0x%lx]\n", svms, 2277 prange, prange->start, prange->last); 2278 svm_range_add_to_svms(prange); 2279 svm_range_add_notifier_locked(mm, prange); 2280 /* TODO: implement deferred validation and mapping */ 2281 break; 2282 default: 2283 WARN_ONCE(1, "Unknown prange 0x%p work op %d\n", prange, 2284 prange->work_item.op); 2285 } 2286 } 2287 2288 static void svm_range_drain_retry_fault(struct svm_range_list *svms) 2289 { 2290 struct kfd_process_device *pdd; 2291 struct kfd_process *p; 2292 uint32_t i; 2293 2294 p = container_of(svms, struct kfd_process, svms); 2295 2296 for_each_set_bit(i, svms->bitmap_supported, p->n_pdds) { 2297 pdd = p->pdds[i]; 2298 if (!pdd) 2299 continue; 2300 2301 pr_debug("drain retry fault gpu %d svms %p\n", i, svms); 2302 2303 amdgpu_ih_wait_on_checkpoint_process_ts(pdd->dev->adev, 2304 pdd->dev->adev->irq.retry_cam_enabled ? 2305 &pdd->dev->adev->irq.ih : 2306 &pdd->dev->adev->irq.ih1); 2307 2308 if (pdd->dev->adev->irq.retry_cam_enabled) 2309 amdgpu_ih_wait_on_checkpoint_process_ts(pdd->dev->adev, 2310 &pdd->dev->adev->irq.ih_soft); 2311 2312 2313 pr_debug("drain retry fault gpu %d svms 0x%p done\n", i, svms); 2314 } 2315 } 2316 2317 static void svm_range_deferred_list_work(struct work_struct *work) 2318 { 2319 struct svm_range_list *svms; 2320 struct svm_range *prange; 2321 struct mm_struct *mm; 2322 2323 svms = container_of(work, struct svm_range_list, deferred_list_work); 2324 pr_debug("enter svms 0x%p\n", svms); 2325 2326 spin_lock(&svms->deferred_list_lock); 2327 while (!list_empty(&svms->deferred_range_list)) { 2328 prange = list_first_entry(&svms->deferred_range_list, 2329 struct svm_range, deferred_list); 2330 spin_unlock(&svms->deferred_list_lock); 2331 2332 pr_debug("prange 0x%p [0x%lx 0x%lx] op %d\n", prange, 2333 prange->start, prange->last, prange->work_item.op); 2334 2335 mm = prange->work_item.mm; 2336 2337 mmap_write_lock(mm); 2338 2339 /* Remove from deferred_list must be inside mmap write lock, for 2340 * two race cases: 2341 * 1. unmap_from_cpu may change work_item.op and add the range 2342 * to deferred_list again, cause use after free bug. 2343 * 2. svm_range_list_lock_and_flush_work may hold mmap write 2344 * lock and continue because deferred_list is empty, but 2345 * deferred_list work is actually waiting for mmap lock. 2346 */ 2347 spin_lock(&svms->deferred_list_lock); 2348 list_del_init(&prange->deferred_list); 2349 spin_unlock(&svms->deferred_list_lock); 2350 2351 mutex_lock(&svms->lock); 2352 mutex_lock(&prange->migrate_mutex); 2353 while (!list_empty(&prange->child_list)) { 2354 struct svm_range *pchild; 2355 2356 pchild = list_first_entry(&prange->child_list, 2357 struct svm_range, child_list); 2358 pr_debug("child prange 0x%p op %d\n", pchild, 2359 pchild->work_item.op); 2360 list_del_init(&pchild->child_list); 2361 svm_range_handle_list_op(svms, pchild, mm); 2362 } 2363 mutex_unlock(&prange->migrate_mutex); 2364 2365 svm_range_handle_list_op(svms, prange, mm); 2366 mutex_unlock(&svms->lock); 2367 mmap_write_unlock(mm); 2368 2369 /* Pairs with mmget in svm_range_add_list_work. If dropping the 2370 * last mm refcount, schedule release work to avoid circular locking 2371 */ 2372 mmput_async(mm); 2373 2374 spin_lock(&svms->deferred_list_lock); 2375 } 2376 spin_unlock(&svms->deferred_list_lock); 2377 pr_debug("exit svms 0x%p\n", svms); 2378 } 2379 2380 void 2381 svm_range_add_list_work(struct svm_range_list *svms, struct svm_range *prange, 2382 struct mm_struct *mm, enum svm_work_list_ops op) 2383 { 2384 spin_lock(&svms->deferred_list_lock); 2385 /* if prange is on the deferred list */ 2386 if (!list_empty(&prange->deferred_list)) { 2387 pr_debug("update exist prange 0x%p work op %d\n", prange, op); 2388 WARN_ONCE(prange->work_item.mm != mm, "unmatch mm\n"); 2389 if (op != SVM_OP_NULL && 2390 prange->work_item.op != SVM_OP_UNMAP_RANGE) 2391 prange->work_item.op = op; 2392 } else { 2393 prange->work_item.op = op; 2394 2395 /* Pairs with mmput in deferred_list_work */ 2396 mmget(mm); 2397 prange->work_item.mm = mm; 2398 list_add_tail(&prange->deferred_list, 2399 &prange->svms->deferred_range_list); 2400 pr_debug("add prange 0x%p [0x%lx 0x%lx] to work list op %d\n", 2401 prange, prange->start, prange->last, op); 2402 } 2403 spin_unlock(&svms->deferred_list_lock); 2404 } 2405 2406 void schedule_deferred_list_work(struct svm_range_list *svms) 2407 { 2408 spin_lock(&svms->deferred_list_lock); 2409 if (!list_empty(&svms->deferred_range_list)) 2410 schedule_work(&svms->deferred_list_work); 2411 spin_unlock(&svms->deferred_list_lock); 2412 } 2413 2414 static void 2415 svm_range_unmap_split(struct mm_struct *mm, struct svm_range *parent, 2416 struct svm_range *prange, unsigned long start, 2417 unsigned long last) 2418 { 2419 struct svm_range *head; 2420 struct svm_range *tail; 2421 2422 if (prange->work_item.op == SVM_OP_UNMAP_RANGE) { 2423 pr_debug("prange 0x%p [0x%lx 0x%lx] is already freed\n", prange, 2424 prange->start, prange->last); 2425 return; 2426 } 2427 if (start > prange->last || last < prange->start) 2428 return; 2429 2430 head = tail = prange; 2431 if (start > prange->start) 2432 svm_range_split(prange, prange->start, start - 1, &tail); 2433 if (last < tail->last) 2434 svm_range_split(tail, last + 1, tail->last, &head); 2435 2436 if (head != prange && tail != prange) { 2437 svm_range_add_child(parent, mm, head, SVM_OP_UNMAP_RANGE); 2438 svm_range_add_child(parent, mm, tail, SVM_OP_ADD_RANGE); 2439 } else if (tail != prange) { 2440 svm_range_add_child(parent, mm, tail, SVM_OP_UNMAP_RANGE); 2441 } else if (head != prange) { 2442 svm_range_add_child(parent, mm, head, SVM_OP_UNMAP_RANGE); 2443 } else if (parent != prange) { 2444 prange->work_item.op = SVM_OP_UNMAP_RANGE; 2445 } 2446 } 2447 2448 static void 2449 svm_range_unmap_from_cpu(struct mm_struct *mm, struct svm_range *prange, 2450 unsigned long start, unsigned long last) 2451 { 2452 uint32_t trigger = KFD_SVM_UNMAP_TRIGGER_UNMAP_FROM_CPU; 2453 struct svm_range_list *svms; 2454 struct svm_range *pchild; 2455 struct kfd_process *p; 2456 unsigned long s, l; 2457 bool unmap_parent; 2458 uint32_t i; 2459 2460 if (atomic_read(&prange->queue_refcount)) { 2461 int r; 2462 2463 pr_warn("Freeing queue vital buffer 0x%lx, queue evicted\n", 2464 prange->start << PAGE_SHIFT); 2465 r = kgd2kfd_quiesce_mm(mm, KFD_QUEUE_EVICTION_TRIGGER_SVM); 2466 if (r) 2467 pr_debug("failed %d to quiesce KFD queues\n", r); 2468 } 2469 2470 p = kfd_lookup_process_by_mm(mm); 2471 if (!p) 2472 return; 2473 svms = &p->svms; 2474 2475 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] [0x%lx 0x%lx]\n", svms, 2476 prange, prange->start, prange->last, start, last); 2477 2478 /* calculate time stamps that are used to decide which page faults need be 2479 * dropped or handled before unmap pages from gpu vm 2480 */ 2481 for_each_set_bit(i, svms->bitmap_supported, p->n_pdds) { 2482 struct kfd_process_device *pdd; 2483 struct amdgpu_device *adev; 2484 struct amdgpu_ih_ring *ih; 2485 uint32_t checkpoint_wptr; 2486 2487 pdd = p->pdds[i]; 2488 if (!pdd) 2489 continue; 2490 2491 adev = pdd->dev->adev; 2492 2493 /* Check and drain ih1 ring if cam not available */ 2494 if (adev->irq.ih1.ring_size) { 2495 ih = &adev->irq.ih1; 2496 checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih); 2497 if (ih->rptr != checkpoint_wptr) { 2498 svms->checkpoint_ts[i] = 2499 amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1); 2500 continue; 2501 } 2502 } 2503 2504 /* check if dev->irq.ih_soft is not empty */ 2505 ih = &adev->irq.ih_soft; 2506 checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih); 2507 if (ih->rptr != checkpoint_wptr) 2508 svms->checkpoint_ts[i] = amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1); 2509 } 2510 2511 unmap_parent = start <= prange->start && last >= prange->last; 2512 2513 list_for_each_entry(pchild, &prange->child_list, child_list) { 2514 mutex_lock_nested(&pchild->lock, 1); 2515 s = max(start, pchild->start); 2516 l = min(last, pchild->last); 2517 if (l >= s) 2518 svm_range_unmap_from_gpus(pchild, s, l, trigger); 2519 svm_range_unmap_split(mm, prange, pchild, start, last); 2520 mutex_unlock(&pchild->lock); 2521 } 2522 s = max(start, prange->start); 2523 l = min(last, prange->last); 2524 if (l >= s) 2525 svm_range_unmap_from_gpus(prange, s, l, trigger); 2526 svm_range_unmap_split(mm, prange, prange, start, last); 2527 2528 if (unmap_parent) 2529 svm_range_add_list_work(svms, prange, mm, SVM_OP_UNMAP_RANGE); 2530 else 2531 svm_range_add_list_work(svms, prange, mm, 2532 SVM_OP_UPDATE_RANGE_NOTIFIER); 2533 schedule_deferred_list_work(svms); 2534 2535 kfd_unref_process(p); 2536 } 2537 2538 /** 2539 * svm_range_cpu_invalidate_pagetables - interval notifier callback 2540 * @mni: mmu_interval_notifier struct 2541 * @range: mmu_notifier_range struct 2542 * @cur_seq: value to pass to mmu_interval_set_seq() 2543 * 2544 * If event is MMU_NOTIFY_UNMAP, this is from CPU unmap range, otherwise, it 2545 * is from migration, or CPU page invalidation callback. 2546 * 2547 * For unmap event, unmap range from GPUs, remove prange from svms in a delayed 2548 * work thread, and split prange if only part of prange is unmapped. 2549 * 2550 * For invalidation event, if GPU retry fault is not enabled, evict the queues, 2551 * then schedule svm_range_restore_work to update GPU mapping and resume queues. 2552 * If GPU retry fault is enabled, unmap the svm range from GPU, retry fault will 2553 * update GPU mapping to recover. 2554 * 2555 * Context: mmap lock, notifier_invalidate_start lock are held 2556 * for invalidate event, prange lock is held if this is from migration 2557 */ 2558 static bool 2559 svm_range_cpu_invalidate_pagetables(struct mmu_interval_notifier *mni, 2560 const struct mmu_notifier_range *range, 2561 unsigned long cur_seq) 2562 { 2563 struct svm_range *prange; 2564 unsigned long start; 2565 unsigned long last; 2566 2567 if (range->event == MMU_NOTIFY_RELEASE) 2568 return true; 2569 if (!mmget_not_zero(mni->mm)) 2570 return true; 2571 2572 start = mni->interval_tree.start; 2573 last = mni->interval_tree.last; 2574 start = max(start, range->start) >> PAGE_SHIFT; 2575 last = min(last, range->end - 1) >> PAGE_SHIFT; 2576 pr_debug("[0x%lx 0x%lx] range[0x%lx 0x%lx] notifier[0x%lx 0x%lx] %d\n", 2577 start, last, range->start >> PAGE_SHIFT, 2578 (range->end - 1) >> PAGE_SHIFT, 2579 mni->interval_tree.start >> PAGE_SHIFT, 2580 mni->interval_tree.last >> PAGE_SHIFT, range->event); 2581 2582 prange = container_of(mni, struct svm_range, notifier); 2583 2584 svm_range_lock(prange); 2585 mmu_interval_set_seq(mni, cur_seq); 2586 2587 switch (range->event) { 2588 case MMU_NOTIFY_UNMAP: 2589 svm_range_unmap_from_cpu(mni->mm, prange, start, last); 2590 break; 2591 default: 2592 svm_range_evict(prange, mni->mm, start, last, range->event); 2593 break; 2594 } 2595 2596 svm_range_unlock(prange); 2597 mmput(mni->mm); 2598 2599 return true; 2600 } 2601 2602 /** 2603 * svm_range_from_addr - find svm range from fault address 2604 * @svms: svm range list header 2605 * @addr: address to search range interval tree, in pages 2606 * @parent: parent range if range is on child list 2607 * 2608 * Context: The caller must hold svms->lock 2609 * 2610 * Return: the svm_range found or NULL 2611 */ 2612 struct svm_range * 2613 svm_range_from_addr(struct svm_range_list *svms, unsigned long addr, 2614 struct svm_range **parent) 2615 { 2616 struct interval_tree_node *node; 2617 struct svm_range *prange; 2618 struct svm_range *pchild; 2619 2620 node = interval_tree_iter_first(&svms->objects, addr, addr); 2621 if (!node) 2622 return NULL; 2623 2624 prange = container_of(node, struct svm_range, it_node); 2625 pr_debug("address 0x%lx prange [0x%lx 0x%lx] node [0x%lx 0x%lx]\n", 2626 addr, prange->start, prange->last, node->start, node->last); 2627 2628 if (addr >= prange->start && addr <= prange->last) { 2629 if (parent) 2630 *parent = prange; 2631 return prange; 2632 } 2633 list_for_each_entry(pchild, &prange->child_list, child_list) 2634 if (addr >= pchild->start && addr <= pchild->last) { 2635 pr_debug("found address 0x%lx pchild [0x%lx 0x%lx]\n", 2636 addr, pchild->start, pchild->last); 2637 if (parent) 2638 *parent = prange; 2639 return pchild; 2640 } 2641 2642 return NULL; 2643 } 2644 2645 /* svm_range_best_restore_location - decide the best fault restore location 2646 * @prange: svm range structure 2647 * @adev: the GPU on which vm fault happened 2648 * 2649 * This is only called when xnack is on, to decide the best location to restore 2650 * the range mapping after GPU vm fault. Caller uses the best location to do 2651 * migration if actual loc is not best location, then update GPU page table 2652 * mapping to the best location. 2653 * 2654 * If the preferred loc is accessible by faulting GPU, use preferred loc. 2655 * If vm fault gpu idx is on range ACCESSIBLE bitmap, best_loc is vm fault gpu 2656 * If vm fault gpu idx is on range ACCESSIBLE_IN_PLACE bitmap, then 2657 * if range actual loc is cpu, best_loc is cpu 2658 * if vm fault gpu is on xgmi same hive of range actual loc gpu, best_loc is 2659 * range actual loc. 2660 * Otherwise, GPU no access, best_loc is -1. 2661 * 2662 * Return: 2663 * -1 means vm fault GPU no access 2664 * 0 for CPU or GPU id 2665 */ 2666 static int32_t 2667 svm_range_best_restore_location(struct svm_range *prange, 2668 struct kfd_node *node, 2669 int32_t *gpuidx) 2670 { 2671 struct kfd_node *bo_node, *preferred_node; 2672 struct kfd_process *p; 2673 uint32_t gpuid; 2674 int r; 2675 2676 p = container_of(prange->svms, struct kfd_process, svms); 2677 2678 r = kfd_process_gpuid_from_node(p, node, &gpuid, gpuidx); 2679 if (r < 0) { 2680 pr_debug("failed to get gpuid from kgd\n"); 2681 return -1; 2682 } 2683 2684 if (node->adev->flags & AMD_IS_APU) 2685 return 0; 2686 2687 if (prange->preferred_loc == gpuid || 2688 prange->preferred_loc == KFD_IOCTL_SVM_LOCATION_SYSMEM) { 2689 return prange->preferred_loc; 2690 } else if (prange->preferred_loc != KFD_IOCTL_SVM_LOCATION_UNDEFINED) { 2691 preferred_node = svm_range_get_node_by_id(prange, prange->preferred_loc); 2692 if (preferred_node && svm_nodes_in_same_hive(node, preferred_node)) 2693 return prange->preferred_loc; 2694 /* fall through */ 2695 } 2696 2697 if (test_bit(*gpuidx, prange->bitmap_access)) 2698 return gpuid; 2699 2700 if (test_bit(*gpuidx, prange->bitmap_aip)) { 2701 if (!prange->actual_loc) 2702 return 0; 2703 2704 bo_node = svm_range_get_node_by_id(prange, prange->actual_loc); 2705 if (bo_node && svm_nodes_in_same_hive(node, bo_node)) 2706 return prange->actual_loc; 2707 else 2708 return 0; 2709 } 2710 2711 return -1; 2712 } 2713 2714 static int 2715 svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr, 2716 unsigned long *start, unsigned long *last, 2717 bool *is_heap_stack) 2718 { 2719 struct vm_area_struct *vma; 2720 struct interval_tree_node *node; 2721 struct rb_node *rb_node; 2722 unsigned long start_limit, end_limit; 2723 2724 vma = vma_lookup(p->mm, addr << PAGE_SHIFT); 2725 if (!vma) { 2726 pr_debug("VMA does not exist in address [0x%llx]\n", addr); 2727 return -EFAULT; 2728 } 2729 2730 *is_heap_stack = vma_is_initial_heap(vma) || vma_is_initial_stack(vma); 2731 2732 start_limit = max(vma->vm_start >> PAGE_SHIFT, 2733 (unsigned long)ALIGN_DOWN(addr, 1UL << p->svms.default_granularity)); 2734 end_limit = min(vma->vm_end >> PAGE_SHIFT, 2735 (unsigned long)ALIGN(addr + 1, 1UL << p->svms.default_granularity)); 2736 2737 /* First range that starts after the fault address */ 2738 node = interval_tree_iter_first(&p->svms.objects, addr + 1, ULONG_MAX); 2739 if (node) { 2740 end_limit = min(end_limit, node->start); 2741 /* Last range that ends before the fault address */ 2742 rb_node = rb_prev(&node->rb); 2743 } else { 2744 /* Last range must end before addr because 2745 * there was no range after addr 2746 */ 2747 rb_node = rb_last(&p->svms.objects.rb_root); 2748 } 2749 if (rb_node) { 2750 node = container_of(rb_node, struct interval_tree_node, rb); 2751 if (node->last >= addr) { 2752 WARN(1, "Overlap with prev node and page fault addr\n"); 2753 return -EFAULT; 2754 } 2755 start_limit = max(start_limit, node->last + 1); 2756 } 2757 2758 *start = start_limit; 2759 *last = end_limit - 1; 2760 2761 pr_debug("vma [0x%lx 0x%lx] range [0x%lx 0x%lx] is_heap_stack %d\n", 2762 vma->vm_start >> PAGE_SHIFT, vma->vm_end >> PAGE_SHIFT, 2763 *start, *last, *is_heap_stack); 2764 2765 return 0; 2766 } 2767 2768 static int 2769 svm_range_check_vm_userptr(struct kfd_process *p, uint64_t start, uint64_t last, 2770 uint64_t *bo_s, uint64_t *bo_l) 2771 { 2772 struct amdgpu_bo_va_mapping *mapping; 2773 struct interval_tree_node *node; 2774 struct amdgpu_bo *bo = NULL; 2775 unsigned long userptr; 2776 uint32_t i; 2777 int r; 2778 2779 for (i = 0; i < p->n_pdds; i++) { 2780 struct amdgpu_vm *vm; 2781 2782 if (!p->pdds[i]->drm_priv) 2783 continue; 2784 2785 vm = drm_priv_to_vm(p->pdds[i]->drm_priv); 2786 r = amdgpu_bo_reserve(vm->root.bo, false); 2787 if (r) 2788 return r; 2789 2790 /* Check userptr by searching entire vm->va interval tree */ 2791 node = interval_tree_iter_first(&vm->va, 0, ~0ULL); 2792 while (node) { 2793 mapping = container_of((struct rb_node *)node, 2794 struct amdgpu_bo_va_mapping, rb); 2795 bo = mapping->bo_va->base.bo; 2796 2797 if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, 2798 start << PAGE_SHIFT, 2799 last << PAGE_SHIFT, 2800 &userptr)) { 2801 node = interval_tree_iter_next(node, 0, ~0ULL); 2802 continue; 2803 } 2804 2805 pr_debug("[0x%llx 0x%llx] already userptr mapped\n", 2806 start, last); 2807 if (bo_s && bo_l) { 2808 *bo_s = userptr >> PAGE_SHIFT; 2809 *bo_l = *bo_s + bo->tbo.ttm->num_pages - 1; 2810 } 2811 amdgpu_bo_unreserve(vm->root.bo); 2812 return -EADDRINUSE; 2813 } 2814 amdgpu_bo_unreserve(vm->root.bo); 2815 } 2816 return 0; 2817 } 2818 2819 static struct 2820 svm_range *svm_range_create_unregistered_range(struct kfd_node *node, 2821 struct kfd_process *p, 2822 struct mm_struct *mm, 2823 int64_t addr) 2824 { 2825 struct svm_range *prange = NULL; 2826 unsigned long start, last; 2827 uint32_t gpuid, gpuidx; 2828 bool is_heap_stack; 2829 uint64_t bo_s = 0; 2830 uint64_t bo_l = 0; 2831 int r; 2832 2833 if (svm_range_get_range_boundaries(p, addr, &start, &last, 2834 &is_heap_stack)) 2835 return NULL; 2836 2837 r = svm_range_check_vm(p, start, last, &bo_s, &bo_l); 2838 if (r != -EADDRINUSE) 2839 r = svm_range_check_vm_userptr(p, start, last, &bo_s, &bo_l); 2840 2841 if (r == -EADDRINUSE) { 2842 if (addr >= bo_s && addr <= bo_l) 2843 return NULL; 2844 2845 /* Create one page svm range if 2MB range overlapping */ 2846 start = addr; 2847 last = addr; 2848 } 2849 2850 prange = svm_range_new(&p->svms, start, last, true); 2851 if (!prange) { 2852 pr_debug("Failed to create prange in address [0x%llx]\n", addr); 2853 return NULL; 2854 } 2855 if (kfd_process_gpuid_from_node(p, node, &gpuid, &gpuidx)) { 2856 pr_debug("failed to get gpuid from kgd\n"); 2857 svm_range_free(prange, true); 2858 return NULL; 2859 } 2860 2861 if (is_heap_stack) 2862 prange->preferred_loc = KFD_IOCTL_SVM_LOCATION_SYSMEM; 2863 2864 svm_range_add_to_svms(prange); 2865 svm_range_add_notifier_locked(mm, prange); 2866 2867 return prange; 2868 } 2869 2870 /* svm_range_skip_recover - decide if prange can be recovered 2871 * @prange: svm range structure 2872 * 2873 * GPU vm retry fault handle skip recover the range for cases: 2874 * 1. prange is on deferred list to be removed after unmap, it is stale fault, 2875 * deferred list work will drain the stale fault before free the prange. 2876 * 2. prange is on deferred list to add interval notifier after split, or 2877 * 3. prange is child range, it is split from parent prange, recover later 2878 * after interval notifier is added. 2879 * 2880 * Return: true to skip recover, false to recover 2881 */ 2882 static bool svm_range_skip_recover(struct svm_range *prange) 2883 { 2884 struct svm_range_list *svms = prange->svms; 2885 2886 spin_lock(&svms->deferred_list_lock); 2887 if (list_empty(&prange->deferred_list) && 2888 list_empty(&prange->child_list)) { 2889 spin_unlock(&svms->deferred_list_lock); 2890 return false; 2891 } 2892 spin_unlock(&svms->deferred_list_lock); 2893 2894 if (prange->work_item.op == SVM_OP_UNMAP_RANGE) { 2895 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] unmapped\n", 2896 svms, prange, prange->start, prange->last); 2897 return true; 2898 } 2899 if (prange->work_item.op == SVM_OP_ADD_RANGE_AND_MAP || 2900 prange->work_item.op == SVM_OP_ADD_RANGE) { 2901 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] not added yet\n", 2902 svms, prange, prange->start, prange->last); 2903 return true; 2904 } 2905 return false; 2906 } 2907 2908 static void 2909 svm_range_count_fault(struct kfd_node *node, struct kfd_process *p, 2910 int32_t gpuidx) 2911 { 2912 struct kfd_process_device *pdd; 2913 2914 /* fault is on different page of same range 2915 * or fault is skipped to recover later 2916 * or fault is on invalid virtual address 2917 */ 2918 if (gpuidx == MAX_GPU_INSTANCE) { 2919 uint32_t gpuid; 2920 int r; 2921 2922 r = kfd_process_gpuid_from_node(p, node, &gpuid, &gpuidx); 2923 if (r < 0) 2924 return; 2925 } 2926 2927 /* fault is recovered 2928 * or fault cannot recover because GPU no access on the range 2929 */ 2930 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 2931 if (pdd) 2932 WRITE_ONCE(pdd->faults, pdd->faults + 1); 2933 } 2934 2935 static bool 2936 svm_fault_allowed(struct vm_area_struct *vma, bool write_fault) 2937 { 2938 unsigned long requested = VM_READ; 2939 2940 if (write_fault) 2941 requested |= VM_WRITE; 2942 2943 pr_debug("requested 0x%lx, vma permission flags 0x%lx\n", requested, 2944 vma->vm_flags); 2945 return (vma->vm_flags & requested) == requested; 2946 } 2947 2948 int 2949 svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid, 2950 uint32_t vmid, uint32_t node_id, 2951 uint64_t addr, uint64_t ts, bool write_fault) 2952 { 2953 unsigned long start, last, size; 2954 struct mm_struct *mm = NULL; 2955 struct svm_range_list *svms; 2956 struct svm_range *prange; 2957 struct kfd_process *p; 2958 ktime_t timestamp = ktime_get_boottime(); 2959 struct kfd_node *node; 2960 int32_t best_loc; 2961 int32_t gpuid, gpuidx = MAX_GPU_INSTANCE; 2962 bool write_locked = false; 2963 struct vm_area_struct *vma; 2964 bool migration = false; 2965 int r = 0; 2966 2967 if (!KFD_IS_SVM_API_SUPPORTED(adev)) { 2968 pr_debug("device does not support SVM\n"); 2969 return -EFAULT; 2970 } 2971 2972 p = kfd_lookup_process_by_pasid(pasid); 2973 if (!p) { 2974 pr_debug("kfd process not founded pasid 0x%x\n", pasid); 2975 return 0; 2976 } 2977 svms = &p->svms; 2978 2979 pr_debug("restoring svms 0x%p fault address 0x%llx\n", svms, addr); 2980 2981 if (atomic_read(&svms->drain_pagefaults)) { 2982 pr_debug("page fault handling disabled, drop fault 0x%llx\n", addr); 2983 r = 0; 2984 goto out; 2985 } 2986 2987 node = kfd_node_by_irq_ids(adev, node_id, vmid); 2988 if (!node) { 2989 pr_debug("kfd node does not exist node_id: %d, vmid: %d\n", node_id, 2990 vmid); 2991 r = -EFAULT; 2992 goto out; 2993 } 2994 2995 if (kfd_process_gpuid_from_node(p, node, &gpuid, &gpuidx)) { 2996 pr_debug("failed to get gpuid/gpuidex for node_id: %d\n", node_id); 2997 r = -EFAULT; 2998 goto out; 2999 } 3000 3001 /* check if this page fault time stamp is before svms->checkpoint_ts */ 3002 if (svms->checkpoint_ts[gpuidx] != 0) { 3003 if (amdgpu_ih_ts_after(ts, svms->checkpoint_ts[gpuidx])) { 3004 pr_debug("draining retry fault, drop fault 0x%llx\n", addr); 3005 r = 0; 3006 goto out; 3007 } else 3008 /* ts is after svms->checkpoint_ts now, reset svms->checkpoint_ts 3009 * to zero to avoid following ts wrap around give wrong comparing 3010 */ 3011 svms->checkpoint_ts[gpuidx] = 0; 3012 } 3013 3014 if (!p->xnack_enabled) { 3015 pr_debug("XNACK not enabled for pasid 0x%x\n", pasid); 3016 r = -EFAULT; 3017 goto out; 3018 } 3019 3020 /* p->lead_thread is available as kfd_process_wq_release flush the work 3021 * before releasing task ref. 3022 */ 3023 mm = get_task_mm(p->lead_thread); 3024 if (!mm) { 3025 pr_debug("svms 0x%p failed to get mm\n", svms); 3026 r = 0; 3027 goto out; 3028 } 3029 3030 mmap_read_lock(mm); 3031 retry_write_locked: 3032 mutex_lock(&svms->lock); 3033 prange = svm_range_from_addr(svms, addr, NULL); 3034 if (!prange) { 3035 pr_debug("failed to find prange svms 0x%p address [0x%llx]\n", 3036 svms, addr); 3037 if (!write_locked) { 3038 /* Need the write lock to create new range with MMU notifier. 3039 * Also flush pending deferred work to make sure the interval 3040 * tree is up to date before we add a new range 3041 */ 3042 mutex_unlock(&svms->lock); 3043 mmap_read_unlock(mm); 3044 mmap_write_lock(mm); 3045 write_locked = true; 3046 goto retry_write_locked; 3047 } 3048 prange = svm_range_create_unregistered_range(node, p, mm, addr); 3049 if (!prange) { 3050 pr_debug("failed to create unregistered range svms 0x%p address [0x%llx]\n", 3051 svms, addr); 3052 mmap_write_downgrade(mm); 3053 r = -EFAULT; 3054 goto out_unlock_svms; 3055 } 3056 } 3057 if (write_locked) 3058 mmap_write_downgrade(mm); 3059 3060 mutex_lock(&prange->migrate_mutex); 3061 3062 if (svm_range_skip_recover(prange)) { 3063 amdgpu_gmc_filter_faults_remove(node->adev, addr, pasid); 3064 r = 0; 3065 goto out_unlock_range; 3066 } 3067 3068 /* skip duplicate vm fault on different pages of same range */ 3069 if (ktime_before(timestamp, ktime_add_ns(prange->validate_timestamp, 3070 AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING))) { 3071 pr_debug("svms 0x%p [0x%lx %lx] already restored\n", 3072 svms, prange->start, prange->last); 3073 r = 0; 3074 goto out_unlock_range; 3075 } 3076 3077 /* __do_munmap removed VMA, return success as we are handling stale 3078 * retry fault. 3079 */ 3080 vma = vma_lookup(mm, addr << PAGE_SHIFT); 3081 if (!vma) { 3082 pr_debug("address 0x%llx VMA is removed\n", addr); 3083 r = 0; 3084 goto out_unlock_range; 3085 } 3086 3087 if (!svm_fault_allowed(vma, write_fault)) { 3088 pr_debug("fault addr 0x%llx no %s permission\n", addr, 3089 write_fault ? "write" : "read"); 3090 r = -EPERM; 3091 goto out_unlock_range; 3092 } 3093 3094 best_loc = svm_range_best_restore_location(prange, node, &gpuidx); 3095 if (best_loc == -1) { 3096 pr_debug("svms %p failed get best restore loc [0x%lx 0x%lx]\n", 3097 svms, prange->start, prange->last); 3098 r = -EACCES; 3099 goto out_unlock_range; 3100 } 3101 3102 pr_debug("svms %p [0x%lx 0x%lx] best restore 0x%x, actual loc 0x%x\n", 3103 svms, prange->start, prange->last, best_loc, 3104 prange->actual_loc); 3105 3106 kfd_smi_event_page_fault_start(node, p->lead_thread->pid, addr, 3107 write_fault, timestamp); 3108 3109 /* Align migration range start and size to granularity size */ 3110 size = 1UL << prange->granularity; 3111 start = max_t(unsigned long, ALIGN_DOWN(addr, size), prange->start); 3112 last = min_t(unsigned long, ALIGN(addr + 1, size) - 1, prange->last); 3113 if (prange->actual_loc != 0 || best_loc != 0) { 3114 migration = true; 3115 3116 if (best_loc) { 3117 r = svm_migrate_to_vram(prange, best_loc, start, last, 3118 mm, KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU); 3119 if (r) { 3120 pr_debug("svm_migrate_to_vram failed (%d) at %llx, falling back to system memory\n", 3121 r, addr); 3122 /* Fallback to system memory if migration to 3123 * VRAM failed 3124 */ 3125 if (prange->actual_loc && prange->actual_loc != best_loc) 3126 r = svm_migrate_vram_to_ram(prange, mm, start, last, 3127 KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU, NULL); 3128 else 3129 r = 0; 3130 } 3131 } else { 3132 r = svm_migrate_vram_to_ram(prange, mm, start, last, 3133 KFD_MIGRATE_TRIGGER_PAGEFAULT_GPU, NULL); 3134 } 3135 if (r) { 3136 pr_debug("failed %d to migrate svms %p [0x%lx 0x%lx]\n", 3137 r, svms, start, last); 3138 goto out_unlock_range; 3139 } 3140 } 3141 3142 r = svm_range_validate_and_map(mm, start, last, prange, gpuidx, false, 3143 false, false); 3144 if (r) 3145 pr_debug("failed %d to map svms 0x%p [0x%lx 0x%lx] to gpus\n", 3146 r, svms, start, last); 3147 3148 kfd_smi_event_page_fault_end(node, p->lead_thread->pid, addr, 3149 migration); 3150 3151 out_unlock_range: 3152 mutex_unlock(&prange->migrate_mutex); 3153 out_unlock_svms: 3154 mutex_unlock(&svms->lock); 3155 mmap_read_unlock(mm); 3156 3157 svm_range_count_fault(node, p, gpuidx); 3158 3159 mmput(mm); 3160 out: 3161 kfd_unref_process(p); 3162 3163 if (r == -EAGAIN) { 3164 pr_debug("recover vm fault later\n"); 3165 amdgpu_gmc_filter_faults_remove(node->adev, addr, pasid); 3166 r = 0; 3167 } 3168 return r; 3169 } 3170 3171 int 3172 svm_range_switch_xnack_reserve_mem(struct kfd_process *p, bool xnack_enabled) 3173 { 3174 struct svm_range *prange, *pchild; 3175 uint64_t reserved_size = 0; 3176 uint64_t size; 3177 int r = 0; 3178 3179 pr_debug("switching xnack from %d to %d\n", p->xnack_enabled, xnack_enabled); 3180 3181 mutex_lock(&p->svms.lock); 3182 3183 list_for_each_entry(prange, &p->svms.list, list) { 3184 svm_range_lock(prange); 3185 list_for_each_entry(pchild, &prange->child_list, child_list) { 3186 size = (pchild->last - pchild->start + 1) << PAGE_SHIFT; 3187 if (xnack_enabled) { 3188 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 3189 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 3190 } else { 3191 r = amdgpu_amdkfd_reserve_mem_limit(NULL, size, 3192 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 3193 if (r) 3194 goto out_unlock; 3195 reserved_size += size; 3196 } 3197 } 3198 3199 size = (prange->last - prange->start + 1) << PAGE_SHIFT; 3200 if (xnack_enabled) { 3201 amdgpu_amdkfd_unreserve_mem_limit(NULL, size, 3202 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 3203 } else { 3204 r = amdgpu_amdkfd_reserve_mem_limit(NULL, size, 3205 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 3206 if (r) 3207 goto out_unlock; 3208 reserved_size += size; 3209 } 3210 out_unlock: 3211 svm_range_unlock(prange); 3212 if (r) 3213 break; 3214 } 3215 3216 if (r) 3217 amdgpu_amdkfd_unreserve_mem_limit(NULL, reserved_size, 3218 KFD_IOC_ALLOC_MEM_FLAGS_USERPTR, 0); 3219 else 3220 /* Change xnack mode must be inside svms lock, to avoid race with 3221 * svm_range_deferred_list_work unreserve memory in parallel. 3222 */ 3223 p->xnack_enabled = xnack_enabled; 3224 3225 mutex_unlock(&p->svms.lock); 3226 return r; 3227 } 3228 3229 void svm_range_list_fini(struct kfd_process *p) 3230 { 3231 struct svm_range *prange; 3232 struct svm_range *next; 3233 3234 pr_debug("pasid 0x%x svms 0x%p\n", p->pasid, &p->svms); 3235 3236 cancel_delayed_work_sync(&p->svms.restore_work); 3237 3238 /* Ensure list work is finished before process is destroyed */ 3239 flush_work(&p->svms.deferred_list_work); 3240 3241 /* 3242 * Ensure no retry fault comes in afterwards, as page fault handler will 3243 * not find kfd process and take mm lock to recover fault. 3244 * stop kfd page fault handing, then wait pending page faults got drained 3245 */ 3246 atomic_set(&p->svms.drain_pagefaults, 1); 3247 svm_range_drain_retry_fault(&p->svms); 3248 3249 list_for_each_entry_safe(prange, next, &p->svms.list, list) { 3250 svm_range_unlink(prange); 3251 svm_range_remove_notifier(prange); 3252 svm_range_free(prange, true); 3253 } 3254 3255 mutex_destroy(&p->svms.lock); 3256 3257 pr_debug("pasid 0x%x svms 0x%p done\n", p->pasid, &p->svms); 3258 } 3259 3260 int svm_range_list_init(struct kfd_process *p) 3261 { 3262 struct svm_range_list *svms = &p->svms; 3263 int i; 3264 3265 svms->objects = RB_ROOT_CACHED; 3266 mutex_init(&svms->lock); 3267 INIT_LIST_HEAD(&svms->list); 3268 atomic_set(&svms->evicted_ranges, 0); 3269 atomic_set(&svms->drain_pagefaults, 0); 3270 INIT_DELAYED_WORK(&svms->restore_work, svm_range_restore_work); 3271 INIT_WORK(&svms->deferred_list_work, svm_range_deferred_list_work); 3272 INIT_LIST_HEAD(&svms->deferred_range_list); 3273 INIT_LIST_HEAD(&svms->criu_svm_metadata_list); 3274 spin_lock_init(&svms->deferred_list_lock); 3275 3276 for (i = 0; i < p->n_pdds; i++) 3277 if (KFD_IS_SVM_API_SUPPORTED(p->pdds[i]->dev->adev)) 3278 bitmap_set(svms->bitmap_supported, i, 1); 3279 3280 /* Value of default granularity cannot exceed 0x1B, the 3281 * number of pages supported by a 4-level paging table 3282 */ 3283 svms->default_granularity = min_t(u8, amdgpu_svm_default_granularity, 0x1B); 3284 pr_debug("Default SVM Granularity to use: %d\n", svms->default_granularity); 3285 3286 return 0; 3287 } 3288 3289 /** 3290 * svm_range_check_vm - check if virtual address range mapped already 3291 * @p: current kfd_process 3292 * @start: range start address, in pages 3293 * @last: range last address, in pages 3294 * @bo_s: mapping start address in pages if address range already mapped 3295 * @bo_l: mapping last address in pages if address range already mapped 3296 * 3297 * The purpose is to avoid virtual address ranges already allocated by 3298 * kfd_ioctl_alloc_memory_of_gpu ioctl. 3299 * It looks for each pdd in the kfd_process. 3300 * 3301 * Context: Process context 3302 * 3303 * Return 0 - OK, if the range is not mapped. 3304 * Otherwise error code: 3305 * -EADDRINUSE - if address is mapped already by kfd_ioctl_alloc_memory_of_gpu 3306 * -ERESTARTSYS - A wait for the buffer to become unreserved was interrupted by 3307 * a signal. Release all buffer reservations and return to user-space. 3308 */ 3309 static int 3310 svm_range_check_vm(struct kfd_process *p, uint64_t start, uint64_t last, 3311 uint64_t *bo_s, uint64_t *bo_l) 3312 { 3313 struct amdgpu_bo_va_mapping *mapping; 3314 struct interval_tree_node *node; 3315 uint32_t i; 3316 int r; 3317 3318 for (i = 0; i < p->n_pdds; i++) { 3319 struct amdgpu_vm *vm; 3320 3321 if (!p->pdds[i]->drm_priv) 3322 continue; 3323 3324 vm = drm_priv_to_vm(p->pdds[i]->drm_priv); 3325 r = amdgpu_bo_reserve(vm->root.bo, false); 3326 if (r) 3327 return r; 3328 3329 node = interval_tree_iter_first(&vm->va, start, last); 3330 if (node) { 3331 pr_debug("range [0x%llx 0x%llx] already TTM mapped\n", 3332 start, last); 3333 mapping = container_of((struct rb_node *)node, 3334 struct amdgpu_bo_va_mapping, rb); 3335 if (bo_s && bo_l) { 3336 *bo_s = mapping->start; 3337 *bo_l = mapping->last; 3338 } 3339 amdgpu_bo_unreserve(vm->root.bo); 3340 return -EADDRINUSE; 3341 } 3342 amdgpu_bo_unreserve(vm->root.bo); 3343 } 3344 3345 return 0; 3346 } 3347 3348 /** 3349 * svm_range_is_valid - check if virtual address range is valid 3350 * @p: current kfd_process 3351 * @start: range start address, in pages 3352 * @size: range size, in pages 3353 * 3354 * Valid virtual address range means it belongs to one or more VMAs 3355 * 3356 * Context: Process context 3357 * 3358 * Return: 3359 * 0 - OK, otherwise error code 3360 */ 3361 static int 3362 svm_range_is_valid(struct kfd_process *p, uint64_t start, uint64_t size) 3363 { 3364 const unsigned long device_vma = VM_IO | VM_PFNMAP | VM_MIXEDMAP; 3365 struct vm_area_struct *vma; 3366 unsigned long end; 3367 unsigned long start_unchg = start; 3368 3369 start <<= PAGE_SHIFT; 3370 end = start + (size << PAGE_SHIFT); 3371 do { 3372 vma = vma_lookup(p->mm, start); 3373 if (!vma || (vma->vm_flags & device_vma)) 3374 return -EFAULT; 3375 start = min(end, vma->vm_end); 3376 } while (start < end); 3377 3378 return svm_range_check_vm(p, start_unchg, (end - 1) >> PAGE_SHIFT, NULL, 3379 NULL); 3380 } 3381 3382 /** 3383 * svm_range_best_prefetch_location - decide the best prefetch location 3384 * @prange: svm range structure 3385 * 3386 * For xnack off: 3387 * If range map to single GPU, the best prefetch location is prefetch_loc, which 3388 * can be CPU or GPU. 3389 * 3390 * If range is ACCESS or ACCESS_IN_PLACE by mGPUs, only if mGPU connection on 3391 * XGMI same hive, the best prefetch location is prefetch_loc GPU, othervise 3392 * the best prefetch location is always CPU, because GPU can not have coherent 3393 * mapping VRAM of other GPUs even with large-BAR PCIe connection. 3394 * 3395 * For xnack on: 3396 * If range is not ACCESS_IN_PLACE by mGPUs, the best prefetch location is 3397 * prefetch_loc, other GPU access will generate vm fault and trigger migration. 3398 * 3399 * If range is ACCESS_IN_PLACE by mGPUs, only if mGPU connection on XGMI same 3400 * hive, the best prefetch location is prefetch_loc GPU, otherwise the best 3401 * prefetch location is always CPU. 3402 * 3403 * Context: Process context 3404 * 3405 * Return: 3406 * 0 for CPU or GPU id 3407 */ 3408 static uint32_t 3409 svm_range_best_prefetch_location(struct svm_range *prange) 3410 { 3411 DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE); 3412 uint32_t best_loc = prange->prefetch_loc; 3413 struct kfd_process_device *pdd; 3414 struct kfd_node *bo_node; 3415 struct kfd_process *p; 3416 uint32_t gpuidx; 3417 3418 p = container_of(prange->svms, struct kfd_process, svms); 3419 3420 if (!best_loc || best_loc == KFD_IOCTL_SVM_LOCATION_UNDEFINED) 3421 goto out; 3422 3423 bo_node = svm_range_get_node_by_id(prange, best_loc); 3424 if (!bo_node) { 3425 WARN_ONCE(1, "failed to get valid kfd node at id%x\n", best_loc); 3426 best_loc = 0; 3427 goto out; 3428 } 3429 3430 if (bo_node->adev->flags & AMD_IS_APU) { 3431 best_loc = 0; 3432 goto out; 3433 } 3434 3435 if (p->xnack_enabled) 3436 bitmap_copy(bitmap, prange->bitmap_aip, MAX_GPU_INSTANCE); 3437 else 3438 bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip, 3439 MAX_GPU_INSTANCE); 3440 3441 for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) { 3442 pdd = kfd_process_device_from_gpuidx(p, gpuidx); 3443 if (!pdd) { 3444 pr_debug("failed to get device by idx 0x%x\n", gpuidx); 3445 continue; 3446 } 3447 3448 if (pdd->dev->adev == bo_node->adev) 3449 continue; 3450 3451 if (!svm_nodes_in_same_hive(pdd->dev, bo_node)) { 3452 best_loc = 0; 3453 break; 3454 } 3455 } 3456 3457 out: 3458 pr_debug("xnack %d svms 0x%p [0x%lx 0x%lx] best loc 0x%x\n", 3459 p->xnack_enabled, &p->svms, prange->start, prange->last, 3460 best_loc); 3461 3462 return best_loc; 3463 } 3464 3465 /* svm_range_trigger_migration - start page migration if prefetch loc changed 3466 * @mm: current process mm_struct 3467 * @prange: svm range structure 3468 * @migrated: output, true if migration is triggered 3469 * 3470 * If range perfetch_loc is GPU, actual loc is cpu 0, then migrate the range 3471 * from ram to vram. 3472 * If range prefetch_loc is cpu 0, actual loc is GPU, then migrate the range 3473 * from vram to ram. 3474 * 3475 * If GPU vm fault retry is not enabled, migration interact with MMU notifier 3476 * and restore work: 3477 * 1. migrate_vma_setup invalidate pages, MMU notifier callback svm_range_evict 3478 * stops all queues, schedule restore work 3479 * 2. svm_range_restore_work wait for migration is done by 3480 * a. svm_range_validate_vram takes prange->migrate_mutex 3481 * b. svm_range_validate_ram HMM get pages wait for CPU fault handle returns 3482 * 3. restore work update mappings of GPU, resume all queues. 3483 * 3484 * Context: Process context 3485 * 3486 * Return: 3487 * 0 - OK, otherwise - error code of migration 3488 */ 3489 static int 3490 svm_range_trigger_migration(struct mm_struct *mm, struct svm_range *prange, 3491 bool *migrated) 3492 { 3493 uint32_t best_loc; 3494 int r = 0; 3495 3496 *migrated = false; 3497 best_loc = svm_range_best_prefetch_location(prange); 3498 3499 /* when best_loc is a gpu node and same as prange->actual_loc 3500 * we still need do migration as prange->actual_loc !=0 does 3501 * not mean all pages in prange are vram. hmm migrate will pick 3502 * up right pages during migration. 3503 */ 3504 if ((best_loc == KFD_IOCTL_SVM_LOCATION_UNDEFINED) || 3505 (best_loc == 0 && prange->actual_loc == 0)) 3506 return 0; 3507 3508 if (!best_loc) { 3509 r = svm_migrate_vram_to_ram(prange, mm, prange->start, prange->last, 3510 KFD_MIGRATE_TRIGGER_PREFETCH, NULL); 3511 *migrated = !r; 3512 return r; 3513 } 3514 3515 r = svm_migrate_to_vram(prange, best_loc, prange->start, prange->last, 3516 mm, KFD_MIGRATE_TRIGGER_PREFETCH); 3517 *migrated = !r; 3518 3519 return 0; 3520 } 3521 3522 int svm_range_schedule_evict_svm_bo(struct amdgpu_amdkfd_fence *fence) 3523 { 3524 /* Dereferencing fence->svm_bo is safe here because the fence hasn't 3525 * signaled yet and we're under the protection of the fence->lock. 3526 * After the fence is signaled in svm_range_bo_release, we cannot get 3527 * here any more. 3528 * 3529 * Reference is dropped in svm_range_evict_svm_bo_worker. 3530 */ 3531 if (svm_bo_ref_unless_zero(fence->svm_bo)) { 3532 WRITE_ONCE(fence->svm_bo->evicting, 1); 3533 schedule_work(&fence->svm_bo->eviction_work); 3534 } 3535 3536 return 0; 3537 } 3538 3539 static void svm_range_evict_svm_bo_worker(struct work_struct *work) 3540 { 3541 struct svm_range_bo *svm_bo; 3542 struct mm_struct *mm; 3543 int r = 0; 3544 3545 svm_bo = container_of(work, struct svm_range_bo, eviction_work); 3546 3547 if (mmget_not_zero(svm_bo->eviction_fence->mm)) { 3548 mm = svm_bo->eviction_fence->mm; 3549 } else { 3550 svm_range_bo_unref(svm_bo); 3551 return; 3552 } 3553 3554 mmap_read_lock(mm); 3555 spin_lock(&svm_bo->list_lock); 3556 while (!list_empty(&svm_bo->range_list) && !r) { 3557 struct svm_range *prange = 3558 list_first_entry(&svm_bo->range_list, 3559 struct svm_range, svm_bo_list); 3560 int retries = 3; 3561 3562 list_del_init(&prange->svm_bo_list); 3563 spin_unlock(&svm_bo->list_lock); 3564 3565 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, 3566 prange->start, prange->last); 3567 3568 mutex_lock(&prange->migrate_mutex); 3569 do { 3570 /* migrate all vram pages in this prange to sys ram 3571 * after that prange->actual_loc should be zero 3572 */ 3573 r = svm_migrate_vram_to_ram(prange, mm, 3574 prange->start, prange->last, 3575 KFD_MIGRATE_TRIGGER_TTM_EVICTION, NULL); 3576 } while (!r && prange->actual_loc && --retries); 3577 3578 if (!r && prange->actual_loc) 3579 pr_info_once("Migration failed during eviction"); 3580 3581 if (!prange->actual_loc) { 3582 mutex_lock(&prange->lock); 3583 prange->svm_bo = NULL; 3584 mutex_unlock(&prange->lock); 3585 } 3586 mutex_unlock(&prange->migrate_mutex); 3587 3588 spin_lock(&svm_bo->list_lock); 3589 } 3590 spin_unlock(&svm_bo->list_lock); 3591 mmap_read_unlock(mm); 3592 mmput(mm); 3593 3594 dma_fence_signal(&svm_bo->eviction_fence->base); 3595 3596 /* This is the last reference to svm_bo, after svm_range_vram_node_free 3597 * has been called in svm_migrate_vram_to_ram 3598 */ 3599 WARN_ONCE(!r && kref_read(&svm_bo->kref) != 1, "This was not the last reference\n"); 3600 svm_range_bo_unref(svm_bo); 3601 } 3602 3603 static int 3604 svm_range_set_attr(struct kfd_process *p, struct mm_struct *mm, 3605 uint64_t start, uint64_t size, uint32_t nattr, 3606 struct kfd_ioctl_svm_attribute *attrs) 3607 { 3608 struct amdkfd_process_info *process_info = p->kgd_process_info; 3609 struct list_head update_list; 3610 struct list_head insert_list; 3611 struct list_head remove_list; 3612 struct list_head remap_list; 3613 struct svm_range_list *svms; 3614 struct svm_range *prange; 3615 struct svm_range *next; 3616 bool update_mapping = false; 3617 bool flush_tlb; 3618 int r, ret = 0; 3619 3620 pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] pages 0x%llx\n", 3621 p->pasid, &p->svms, start, start + size - 1, size); 3622 3623 r = svm_range_check_attr(p, nattr, attrs); 3624 if (r) 3625 return r; 3626 3627 svms = &p->svms; 3628 3629 mutex_lock(&process_info->lock); 3630 3631 svm_range_list_lock_and_flush_work(svms, mm); 3632 3633 r = svm_range_is_valid(p, start, size); 3634 if (r) { 3635 pr_debug("invalid range r=%d\n", r); 3636 mmap_write_unlock(mm); 3637 goto out; 3638 } 3639 3640 mutex_lock(&svms->lock); 3641 3642 /* Add new range and split existing ranges as needed */ 3643 r = svm_range_add(p, start, size, nattr, attrs, &update_list, 3644 &insert_list, &remove_list, &remap_list); 3645 if (r) { 3646 mutex_unlock(&svms->lock); 3647 mmap_write_unlock(mm); 3648 goto out; 3649 } 3650 /* Apply changes as a transaction */ 3651 list_for_each_entry_safe(prange, next, &insert_list, list) { 3652 svm_range_add_to_svms(prange); 3653 svm_range_add_notifier_locked(mm, prange); 3654 } 3655 list_for_each_entry(prange, &update_list, update_list) { 3656 svm_range_apply_attrs(p, prange, nattr, attrs, &update_mapping); 3657 /* TODO: unmap ranges from GPU that lost access */ 3658 } 3659 list_for_each_entry_safe(prange, next, &remove_list, update_list) { 3660 pr_debug("unlink old 0x%p prange 0x%p [0x%lx 0x%lx]\n", 3661 prange->svms, prange, prange->start, 3662 prange->last); 3663 svm_range_unlink(prange); 3664 svm_range_remove_notifier(prange); 3665 svm_range_free(prange, false); 3666 } 3667 3668 mmap_write_downgrade(mm); 3669 /* Trigger migrations and revalidate and map to GPUs as needed. If 3670 * this fails we may be left with partially completed actions. There 3671 * is no clean way of rolling back to the previous state in such a 3672 * case because the rollback wouldn't be guaranteed to work either. 3673 */ 3674 list_for_each_entry(prange, &update_list, update_list) { 3675 bool migrated; 3676 3677 mutex_lock(&prange->migrate_mutex); 3678 3679 r = svm_range_trigger_migration(mm, prange, &migrated); 3680 if (r) 3681 goto out_unlock_range; 3682 3683 if (migrated && (!p->xnack_enabled || 3684 (prange->flags & KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED)) && 3685 prange->mapped_to_gpu) { 3686 pr_debug("restore_work will update mappings of GPUs\n"); 3687 mutex_unlock(&prange->migrate_mutex); 3688 continue; 3689 } 3690 3691 if (!migrated && !update_mapping) { 3692 mutex_unlock(&prange->migrate_mutex); 3693 continue; 3694 } 3695 3696 flush_tlb = !migrated && update_mapping && prange->mapped_to_gpu; 3697 3698 r = svm_range_validate_and_map(mm, prange->start, prange->last, prange, 3699 MAX_GPU_INSTANCE, true, true, flush_tlb); 3700 if (r) 3701 pr_debug("failed %d to map svm range\n", r); 3702 3703 out_unlock_range: 3704 mutex_unlock(&prange->migrate_mutex); 3705 if (r) 3706 ret = r; 3707 } 3708 3709 list_for_each_entry(prange, &remap_list, update_list) { 3710 pr_debug("Remapping prange 0x%p [0x%lx 0x%lx]\n", 3711 prange, prange->start, prange->last); 3712 mutex_lock(&prange->migrate_mutex); 3713 r = svm_range_validate_and_map(mm, prange->start, prange->last, prange, 3714 MAX_GPU_INSTANCE, true, true, prange->mapped_to_gpu); 3715 if (r) 3716 pr_debug("failed %d on remap svm range\n", r); 3717 mutex_unlock(&prange->migrate_mutex); 3718 if (r) 3719 ret = r; 3720 } 3721 3722 dynamic_svm_range_dump(svms); 3723 3724 mutex_unlock(&svms->lock); 3725 mmap_read_unlock(mm); 3726 out: 3727 mutex_unlock(&process_info->lock); 3728 3729 pr_debug("pasid 0x%x svms 0x%p [0x%llx 0x%llx] done, r=%d\n", p->pasid, 3730 &p->svms, start, start + size - 1, r); 3731 3732 return ret ? ret : r; 3733 } 3734 3735 static int 3736 svm_range_get_attr(struct kfd_process *p, struct mm_struct *mm, 3737 uint64_t start, uint64_t size, uint32_t nattr, 3738 struct kfd_ioctl_svm_attribute *attrs) 3739 { 3740 DECLARE_BITMAP(bitmap_access, MAX_GPU_INSTANCE); 3741 DECLARE_BITMAP(bitmap_aip, MAX_GPU_INSTANCE); 3742 bool get_preferred_loc = false; 3743 bool get_prefetch_loc = false; 3744 bool get_granularity = false; 3745 bool get_accessible = false; 3746 bool get_flags = false; 3747 uint64_t last = start + size - 1UL; 3748 uint8_t granularity = 0xff; 3749 struct interval_tree_node *node; 3750 struct svm_range_list *svms; 3751 struct svm_range *prange; 3752 uint32_t prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3753 uint32_t location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3754 uint32_t flags_and = 0xffffffff; 3755 uint32_t flags_or = 0; 3756 int gpuidx; 3757 uint32_t i; 3758 int r = 0; 3759 3760 pr_debug("svms 0x%p [0x%llx 0x%llx] nattr 0x%x\n", &p->svms, start, 3761 start + size - 1, nattr); 3762 3763 /* Flush pending deferred work to avoid racing with deferred actions from 3764 * previous memory map changes (e.g. munmap). Concurrent memory map changes 3765 * can still race with get_attr because we don't hold the mmap lock. But that 3766 * would be a race condition in the application anyway, and undefined 3767 * behaviour is acceptable in that case. 3768 */ 3769 flush_work(&p->svms.deferred_list_work); 3770 3771 mmap_read_lock(mm); 3772 r = svm_range_is_valid(p, start, size); 3773 mmap_read_unlock(mm); 3774 if (r) { 3775 pr_debug("invalid range r=%d\n", r); 3776 return r; 3777 } 3778 3779 for (i = 0; i < nattr; i++) { 3780 switch (attrs[i].type) { 3781 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 3782 get_preferred_loc = true; 3783 break; 3784 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3785 get_prefetch_loc = true; 3786 break; 3787 case KFD_IOCTL_SVM_ATTR_ACCESS: 3788 get_accessible = true; 3789 break; 3790 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3791 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 3792 get_flags = true; 3793 break; 3794 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 3795 get_granularity = true; 3796 break; 3797 case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE: 3798 case KFD_IOCTL_SVM_ATTR_NO_ACCESS: 3799 fallthrough; 3800 default: 3801 pr_debug("get invalid attr type 0x%x\n", attrs[i].type); 3802 return -EINVAL; 3803 } 3804 } 3805 3806 svms = &p->svms; 3807 3808 mutex_lock(&svms->lock); 3809 3810 node = interval_tree_iter_first(&svms->objects, start, last); 3811 if (!node) { 3812 pr_debug("range attrs not found return default values\n"); 3813 svm_range_set_default_attributes(svms, &location, &prefetch_loc, 3814 &granularity, &flags_and); 3815 flags_or = flags_and; 3816 if (p->xnack_enabled) 3817 bitmap_copy(bitmap_access, svms->bitmap_supported, 3818 MAX_GPU_INSTANCE); 3819 else 3820 bitmap_zero(bitmap_access, MAX_GPU_INSTANCE); 3821 bitmap_zero(bitmap_aip, MAX_GPU_INSTANCE); 3822 goto fill_values; 3823 } 3824 bitmap_copy(bitmap_access, svms->bitmap_supported, MAX_GPU_INSTANCE); 3825 bitmap_copy(bitmap_aip, svms->bitmap_supported, MAX_GPU_INSTANCE); 3826 3827 while (node) { 3828 struct interval_tree_node *next; 3829 3830 prange = container_of(node, struct svm_range, it_node); 3831 next = interval_tree_iter_next(node, start, last); 3832 3833 if (get_preferred_loc) { 3834 if (prange->preferred_loc == 3835 KFD_IOCTL_SVM_LOCATION_UNDEFINED || 3836 (location != KFD_IOCTL_SVM_LOCATION_UNDEFINED && 3837 location != prange->preferred_loc)) { 3838 location = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3839 get_preferred_loc = false; 3840 } else { 3841 location = prange->preferred_loc; 3842 } 3843 } 3844 if (get_prefetch_loc) { 3845 if (prange->prefetch_loc == 3846 KFD_IOCTL_SVM_LOCATION_UNDEFINED || 3847 (prefetch_loc != KFD_IOCTL_SVM_LOCATION_UNDEFINED && 3848 prefetch_loc != prange->prefetch_loc)) { 3849 prefetch_loc = KFD_IOCTL_SVM_LOCATION_UNDEFINED; 3850 get_prefetch_loc = false; 3851 } else { 3852 prefetch_loc = prange->prefetch_loc; 3853 } 3854 } 3855 if (get_accessible) { 3856 bitmap_and(bitmap_access, bitmap_access, 3857 prange->bitmap_access, MAX_GPU_INSTANCE); 3858 bitmap_and(bitmap_aip, bitmap_aip, 3859 prange->bitmap_aip, MAX_GPU_INSTANCE); 3860 } 3861 if (get_flags) { 3862 flags_and &= prange->flags; 3863 flags_or |= prange->flags; 3864 } 3865 3866 if (get_granularity && prange->granularity < granularity) 3867 granularity = prange->granularity; 3868 3869 node = next; 3870 } 3871 fill_values: 3872 mutex_unlock(&svms->lock); 3873 3874 for (i = 0; i < nattr; i++) { 3875 switch (attrs[i].type) { 3876 case KFD_IOCTL_SVM_ATTR_PREFERRED_LOC: 3877 attrs[i].value = location; 3878 break; 3879 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3880 attrs[i].value = prefetch_loc; 3881 break; 3882 case KFD_IOCTL_SVM_ATTR_ACCESS: 3883 gpuidx = kfd_process_gpuidx_from_gpuid(p, 3884 attrs[i].value); 3885 if (gpuidx < 0) { 3886 pr_debug("invalid gpuid %x\n", attrs[i].value); 3887 return -EINVAL; 3888 } 3889 if (test_bit(gpuidx, bitmap_access)) 3890 attrs[i].type = KFD_IOCTL_SVM_ATTR_ACCESS; 3891 else if (test_bit(gpuidx, bitmap_aip)) 3892 attrs[i].type = 3893 KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE; 3894 else 3895 attrs[i].type = KFD_IOCTL_SVM_ATTR_NO_ACCESS; 3896 break; 3897 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3898 attrs[i].value = flags_and; 3899 break; 3900 case KFD_IOCTL_SVM_ATTR_CLR_FLAGS: 3901 attrs[i].value = ~flags_or; 3902 break; 3903 case KFD_IOCTL_SVM_ATTR_GRANULARITY: 3904 attrs[i].value = (uint32_t)granularity; 3905 break; 3906 } 3907 } 3908 3909 return 0; 3910 } 3911 3912 int kfd_criu_resume_svm(struct kfd_process *p) 3913 { 3914 struct kfd_ioctl_svm_attribute *set_attr_new, *set_attr = NULL; 3915 int nattr_common = 4, nattr_accessibility = 1; 3916 struct criu_svm_metadata *criu_svm_md = NULL; 3917 struct svm_range_list *svms = &p->svms; 3918 struct criu_svm_metadata *next = NULL; 3919 uint32_t set_flags = 0xffffffff; 3920 int i, j, num_attrs, ret = 0; 3921 uint64_t set_attr_size; 3922 struct mm_struct *mm; 3923 3924 if (list_empty(&svms->criu_svm_metadata_list)) { 3925 pr_debug("No SVM data from CRIU restore stage 2\n"); 3926 return ret; 3927 } 3928 3929 mm = get_task_mm(p->lead_thread); 3930 if (!mm) { 3931 pr_err("failed to get mm for the target process\n"); 3932 return -ESRCH; 3933 } 3934 3935 num_attrs = nattr_common + (nattr_accessibility * p->n_pdds); 3936 3937 i = j = 0; 3938 list_for_each_entry(criu_svm_md, &svms->criu_svm_metadata_list, list) { 3939 pr_debug("criu_svm_md[%d]\n\tstart: 0x%llx size: 0x%llx (npages)\n", 3940 i, criu_svm_md->data.start_addr, criu_svm_md->data.size); 3941 3942 for (j = 0; j < num_attrs; j++) { 3943 pr_debug("\ncriu_svm_md[%d]->attrs[%d].type : 0x%x\ncriu_svm_md[%d]->attrs[%d].value : 0x%x\n", 3944 i, j, criu_svm_md->data.attrs[j].type, 3945 i, j, criu_svm_md->data.attrs[j].value); 3946 switch (criu_svm_md->data.attrs[j].type) { 3947 /* During Checkpoint operation, the query for 3948 * KFD_IOCTL_SVM_ATTR_PREFETCH_LOC attribute might 3949 * return KFD_IOCTL_SVM_LOCATION_UNDEFINED if they were 3950 * not used by the range which was checkpointed. Care 3951 * must be taken to not restore with an invalid value 3952 * otherwise the gpuidx value will be invalid and 3953 * set_attr would eventually fail so just replace those 3954 * with another dummy attribute such as 3955 * KFD_IOCTL_SVM_ATTR_SET_FLAGS. 3956 */ 3957 case KFD_IOCTL_SVM_ATTR_PREFETCH_LOC: 3958 if (criu_svm_md->data.attrs[j].value == 3959 KFD_IOCTL_SVM_LOCATION_UNDEFINED) { 3960 criu_svm_md->data.attrs[j].type = 3961 KFD_IOCTL_SVM_ATTR_SET_FLAGS; 3962 criu_svm_md->data.attrs[j].value = 0; 3963 } 3964 break; 3965 case KFD_IOCTL_SVM_ATTR_SET_FLAGS: 3966 set_flags = criu_svm_md->data.attrs[j].value; 3967 break; 3968 default: 3969 break; 3970 } 3971 } 3972 3973 /* CLR_FLAGS is not available via get_attr during checkpoint but 3974 * it needs to be inserted before restoring the ranges so 3975 * allocate extra space for it before calling set_attr 3976 */ 3977 set_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 3978 (num_attrs + 1); 3979 set_attr_new = krealloc(set_attr, set_attr_size, 3980 GFP_KERNEL); 3981 if (!set_attr_new) { 3982 ret = -ENOMEM; 3983 goto exit; 3984 } 3985 set_attr = set_attr_new; 3986 3987 memcpy(set_attr, criu_svm_md->data.attrs, num_attrs * 3988 sizeof(struct kfd_ioctl_svm_attribute)); 3989 set_attr[num_attrs].type = KFD_IOCTL_SVM_ATTR_CLR_FLAGS; 3990 set_attr[num_attrs].value = ~set_flags; 3991 3992 ret = svm_range_set_attr(p, mm, criu_svm_md->data.start_addr, 3993 criu_svm_md->data.size, num_attrs + 1, 3994 set_attr); 3995 if (ret) { 3996 pr_err("CRIU: failed to set range attributes\n"); 3997 goto exit; 3998 } 3999 4000 i++; 4001 } 4002 exit: 4003 kfree(set_attr); 4004 list_for_each_entry_safe(criu_svm_md, next, &svms->criu_svm_metadata_list, list) { 4005 pr_debug("freeing criu_svm_md[]\n\tstart: 0x%llx\n", 4006 criu_svm_md->data.start_addr); 4007 kfree(criu_svm_md); 4008 } 4009 4010 mmput(mm); 4011 return ret; 4012 4013 } 4014 4015 int kfd_criu_restore_svm(struct kfd_process *p, 4016 uint8_t __user *user_priv_ptr, 4017 uint64_t *priv_data_offset, 4018 uint64_t max_priv_data_size) 4019 { 4020 uint64_t svm_priv_data_size, svm_object_md_size, svm_attrs_size; 4021 int nattr_common = 4, nattr_accessibility = 1; 4022 struct criu_svm_metadata *criu_svm_md = NULL; 4023 struct svm_range_list *svms = &p->svms; 4024 uint32_t num_devices; 4025 int ret = 0; 4026 4027 num_devices = p->n_pdds; 4028 /* Handle one SVM range object at a time, also the number of gpus are 4029 * assumed to be same on the restore node, checking must be done while 4030 * evaluating the topology earlier 4031 */ 4032 4033 svm_attrs_size = sizeof(struct kfd_ioctl_svm_attribute) * 4034 (nattr_common + nattr_accessibility * num_devices); 4035 svm_object_md_size = sizeof(struct criu_svm_metadata) + svm_attrs_size; 4036 4037 svm_priv_data_size = sizeof(struct kfd_criu_svm_range_priv_data) + 4038 svm_attrs_size; 4039 4040 criu_svm_md = kzalloc(svm_object_md_size, GFP_KERNEL); 4041 if (!criu_svm_md) { 4042 pr_err("failed to allocate memory to store svm metadata\n"); 4043 return -ENOMEM; 4044 } 4045 if (*priv_data_offset + svm_priv_data_size > max_priv_data_size) { 4046 ret = -EINVAL; 4047 goto exit; 4048 } 4049 4050 ret = copy_from_user(&criu_svm_md->data, user_priv_ptr + *priv_data_offset, 4051 svm_priv_data_size); 4052 if (ret) { 4053 ret = -EFAULT; 4054 goto exit; 4055 } 4056 *priv_data_offset += svm_priv_data_size; 4057 4058 list_add_tail(&criu_svm_md->list, &svms->criu_svm_metadata_list); 4059 4060 return 0; 4061 4062 4063 exit: 4064 kfree(criu_svm_md); 4065 return ret; 4066 } 4067 4068 int svm_range_get_info(struct kfd_process *p, uint32_t *num_svm_ranges, 4069 uint64_t *svm_priv_data_size) 4070 { 4071 uint64_t total_size, accessibility_size, common_attr_size; 4072 int nattr_common = 4, nattr_accessibility = 1; 4073 int num_devices = p->n_pdds; 4074 struct svm_range_list *svms; 4075 struct svm_range *prange; 4076 uint32_t count = 0; 4077 4078 *svm_priv_data_size = 0; 4079 4080 svms = &p->svms; 4081 if (!svms) 4082 return -EINVAL; 4083 4084 mutex_lock(&svms->lock); 4085 list_for_each_entry(prange, &svms->list, list) { 4086 pr_debug("prange: 0x%p start: 0x%lx\t npages: 0x%llx\t end: 0x%llx\n", 4087 prange, prange->start, prange->npages, 4088 prange->start + prange->npages - 1); 4089 count++; 4090 } 4091 mutex_unlock(&svms->lock); 4092 4093 *num_svm_ranges = count; 4094 /* Only the accessbility attributes need to be queried for all the gpus 4095 * individually, remaining ones are spanned across the entire process 4096 * regardless of the various gpu nodes. Of the remaining attributes, 4097 * KFD_IOCTL_SVM_ATTR_CLR_FLAGS need not be saved. 4098 * 4099 * KFD_IOCTL_SVM_ATTR_PREFERRED_LOC 4100 * KFD_IOCTL_SVM_ATTR_PREFETCH_LOC 4101 * KFD_IOCTL_SVM_ATTR_SET_FLAGS 4102 * KFD_IOCTL_SVM_ATTR_GRANULARITY 4103 * 4104 * ** ACCESSBILITY ATTRIBUTES ** 4105 * (Considered as one, type is altered during query, value is gpuid) 4106 * KFD_IOCTL_SVM_ATTR_ACCESS 4107 * KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE 4108 * KFD_IOCTL_SVM_ATTR_NO_ACCESS 4109 */ 4110 if (*num_svm_ranges > 0) { 4111 common_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 4112 nattr_common; 4113 accessibility_size = sizeof(struct kfd_ioctl_svm_attribute) * 4114 nattr_accessibility * num_devices; 4115 4116 total_size = sizeof(struct kfd_criu_svm_range_priv_data) + 4117 common_attr_size + accessibility_size; 4118 4119 *svm_priv_data_size = *num_svm_ranges * total_size; 4120 } 4121 4122 pr_debug("num_svm_ranges %u total_priv_size %llu\n", *num_svm_ranges, 4123 *svm_priv_data_size); 4124 return 0; 4125 } 4126 4127 int kfd_criu_checkpoint_svm(struct kfd_process *p, 4128 uint8_t __user *user_priv_data, 4129 uint64_t *priv_data_offset) 4130 { 4131 struct kfd_criu_svm_range_priv_data *svm_priv = NULL; 4132 struct kfd_ioctl_svm_attribute *query_attr = NULL; 4133 uint64_t svm_priv_data_size, query_attr_size = 0; 4134 int index, nattr_common = 4, ret = 0; 4135 struct svm_range_list *svms; 4136 int num_devices = p->n_pdds; 4137 struct svm_range *prange; 4138 struct mm_struct *mm; 4139 4140 svms = &p->svms; 4141 if (!svms) 4142 return -EINVAL; 4143 4144 mm = get_task_mm(p->lead_thread); 4145 if (!mm) { 4146 pr_err("failed to get mm for the target process\n"); 4147 return -ESRCH; 4148 } 4149 4150 query_attr_size = sizeof(struct kfd_ioctl_svm_attribute) * 4151 (nattr_common + num_devices); 4152 4153 query_attr = kzalloc(query_attr_size, GFP_KERNEL); 4154 if (!query_attr) { 4155 ret = -ENOMEM; 4156 goto exit; 4157 } 4158 4159 query_attr[0].type = KFD_IOCTL_SVM_ATTR_PREFERRED_LOC; 4160 query_attr[1].type = KFD_IOCTL_SVM_ATTR_PREFETCH_LOC; 4161 query_attr[2].type = KFD_IOCTL_SVM_ATTR_SET_FLAGS; 4162 query_attr[3].type = KFD_IOCTL_SVM_ATTR_GRANULARITY; 4163 4164 for (index = 0; index < num_devices; index++) { 4165 struct kfd_process_device *pdd = p->pdds[index]; 4166 4167 query_attr[index + nattr_common].type = 4168 KFD_IOCTL_SVM_ATTR_ACCESS; 4169 query_attr[index + nattr_common].value = pdd->user_gpu_id; 4170 } 4171 4172 svm_priv_data_size = sizeof(*svm_priv) + query_attr_size; 4173 4174 svm_priv = kzalloc(svm_priv_data_size, GFP_KERNEL); 4175 if (!svm_priv) { 4176 ret = -ENOMEM; 4177 goto exit_query; 4178 } 4179 4180 index = 0; 4181 list_for_each_entry(prange, &svms->list, list) { 4182 4183 svm_priv->object_type = KFD_CRIU_OBJECT_TYPE_SVM_RANGE; 4184 svm_priv->start_addr = prange->start; 4185 svm_priv->size = prange->npages; 4186 memcpy(&svm_priv->attrs, query_attr, query_attr_size); 4187 pr_debug("CRIU: prange: 0x%p start: 0x%lx\t npages: 0x%llx end: 0x%llx\t size: 0x%llx\n", 4188 prange, prange->start, prange->npages, 4189 prange->start + prange->npages - 1, 4190 prange->npages * PAGE_SIZE); 4191 4192 ret = svm_range_get_attr(p, mm, svm_priv->start_addr, 4193 svm_priv->size, 4194 (nattr_common + num_devices), 4195 svm_priv->attrs); 4196 if (ret) { 4197 pr_err("CRIU: failed to obtain range attributes\n"); 4198 goto exit_priv; 4199 } 4200 4201 if (copy_to_user(user_priv_data + *priv_data_offset, svm_priv, 4202 svm_priv_data_size)) { 4203 pr_err("Failed to copy svm priv to user\n"); 4204 ret = -EFAULT; 4205 goto exit_priv; 4206 } 4207 4208 *priv_data_offset += svm_priv_data_size; 4209 4210 } 4211 4212 4213 exit_priv: 4214 kfree(svm_priv); 4215 exit_query: 4216 kfree(query_attr); 4217 exit: 4218 mmput(mm); 4219 return ret; 4220 } 4221 4222 int 4223 svm_ioctl(struct kfd_process *p, enum kfd_ioctl_svm_op op, uint64_t start, 4224 uint64_t size, uint32_t nattrs, struct kfd_ioctl_svm_attribute *attrs) 4225 { 4226 struct mm_struct *mm = current->mm; 4227 int r; 4228 4229 start >>= PAGE_SHIFT; 4230 size >>= PAGE_SHIFT; 4231 4232 switch (op) { 4233 case KFD_IOCTL_SVM_OP_SET_ATTR: 4234 r = svm_range_set_attr(p, mm, start, size, nattrs, attrs); 4235 break; 4236 case KFD_IOCTL_SVM_OP_GET_ATTR: 4237 r = svm_range_get_attr(p, mm, start, size, nattrs, attrs); 4238 break; 4239 default: 4240 r = EINVAL; 4241 break; 4242 } 4243 4244 return r; 4245 } 4246