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#include <linux/types.h> 24#include <linux/hmm.h> 25#include <linux/dma-direction.h> 26#include <linux/dma-mapping.h> 27#include <linux/migrate.h> 28#include "amdgpu_sync.h" 29#include "amdgpu_object.h" 30#include "amdgpu_vm.h" 31#include "amdgpu_res_cursor.h" 32#include "kfd_priv.h" 33#include "kfd_svm.h" 34#include "kfd_migrate.h" 35#include "kfd_smi_events.h" 36 37#ifdef dev_fmt 38#undef dev_fmt 39#endif 40#define dev_fmt(fmt) "kfd_migrate: " fmt 41 42static uint64_t 43svm_migrate_direct_mapping_addr(struct amdgpu_device *adev, uint64_t addr) 44{ 45 return addr + amdgpu_ttm_domain_start(adev, TTM_PL_VRAM); 46} 47 48static int 49svm_migrate_gart_map(struct amdgpu_ring *ring, uint64_t npages, 50 dma_addr_t *addr, uint64_t *gart_addr, uint64_t flags) 51{ 52 struct amdgpu_device *adev = ring->adev; 53 struct amdgpu_job *job; 54 unsigned int num_dw, num_bytes; 55 struct dma_fence *fence; 56 uint64_t src_addr, dst_addr; 57 uint64_t pte_flags; 58 void *cpu_addr; 59 int r; 60 61 /* use gart window 0 */ 62 *gart_addr = adev->gmc.gart_start; 63 64 num_dw = ALIGN(adev->mman.buffer_funcs->copy_num_dw, 8); 65 num_bytes = npages * 8; 66 67 r = amdgpu_job_alloc_with_ib(adev, &adev->mman.high_pr, 68 AMDGPU_FENCE_OWNER_UNDEFINED, 69 num_dw * 4 + num_bytes, 70 AMDGPU_IB_POOL_DELAYED, 71 &job); 72 if (r) 73 return r; 74 75 src_addr = num_dw * 4; 76 src_addr += job->ibs[0].gpu_addr; 77 78 dst_addr = amdgpu_bo_gpu_offset(adev->gart.bo); 79 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr, 80 dst_addr, num_bytes, false); 81 82 amdgpu_ring_pad_ib(ring, &job->ibs[0]); 83 WARN_ON(job->ibs[0].length_dw > num_dw); 84 85 pte_flags = AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE; 86 pte_flags |= AMDGPU_PTE_SYSTEM | AMDGPU_PTE_SNOOPED; 87 if (!(flags & KFD_IOCTL_SVM_FLAG_GPU_RO)) 88 pte_flags |= AMDGPU_PTE_WRITEABLE; 89 pte_flags |= adev->gart.gart_pte_flags; 90 91 cpu_addr = &job->ibs[0].ptr[num_dw]; 92 93 amdgpu_gart_map(adev, 0, npages, addr, pte_flags, cpu_addr); 94 fence = amdgpu_job_submit(job); 95 dma_fence_put(fence); 96 97 return r; 98} 99 100/** 101 * svm_migrate_copy_memory_gart - sdma copy data between ram and vram 102 * 103 * @adev: amdgpu device the sdma ring running 104 * @sys: system DMA pointer to be copied 105 * @vram: vram destination DMA pointer 106 * @npages: number of pages to copy 107 * @direction: enum MIGRATION_COPY_DIR 108 * @mfence: output, sdma fence to signal after sdma is done 109 * 110 * ram address uses GART table continuous entries mapping to ram pages, 111 * vram address uses direct mapping of vram pages, which must have npages 112 * number of continuous pages. 113 * GART update and sdma uses same buf copy function ring, sdma is splited to 114 * multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, wait for 115 * the last sdma finish fence which is returned to check copy memory is done. 116 * 117 * Context: Process context, takes and releases gtt_window_lock 118 * 119 * Return: 120 * 0 - OK, otherwise error code 121 */ 122 123static int 124svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys, 125 uint64_t *vram, uint64_t npages, 126 enum MIGRATION_COPY_DIR direction, 127 struct dma_fence **mfence) 128{ 129 const uint64_t GTT_MAX_PAGES = AMDGPU_GTT_MAX_TRANSFER_SIZE; 130 struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; 131 uint64_t gart_s, gart_d; 132 struct dma_fence *next; 133 uint64_t size; 134 int r; 135 136 mutex_lock(&adev->mman.gtt_window_lock); 137 138 while (npages) { 139 size = min(GTT_MAX_PAGES, npages); 140 141 if (direction == FROM_VRAM_TO_RAM) { 142 gart_s = svm_migrate_direct_mapping_addr(adev, *vram); 143 r = svm_migrate_gart_map(ring, size, sys, &gart_d, 0); 144 145 } else if (direction == FROM_RAM_TO_VRAM) { 146 r = svm_migrate_gart_map(ring, size, sys, &gart_s, 147 KFD_IOCTL_SVM_FLAG_GPU_RO); 148 gart_d = svm_migrate_direct_mapping_addr(adev, *vram); 149 } 150 if (r) { 151 dev_err(adev->dev, "fail %d create gart mapping\n", r); 152 goto out_unlock; 153 } 154 155 r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE, 156 NULL, &next, false, true, false); 157 if (r) { 158 dev_err(adev->dev, "fail %d to copy memory\n", r); 159 goto out_unlock; 160 } 161 162 dma_fence_put(*mfence); 163 *mfence = next; 164 npages -= size; 165 if (npages) { 166 sys += size; 167 vram += size; 168 } 169 } 170 171out_unlock: 172 mutex_unlock(&adev->mman.gtt_window_lock); 173 174 return r; 175} 176 177/** 178 * svm_migrate_copy_done - wait for memory copy sdma is done 179 * 180 * @adev: amdgpu device the sdma memory copy is executing on 181 * @mfence: migrate fence 182 * 183 * Wait for dma fence is signaled, if the copy ssplit into multiple sdma 184 * operations, this is the last sdma operation fence. 185 * 186 * Context: called after svm_migrate_copy_memory 187 * 188 * Return: 189 * 0 - success 190 * otherwise - error code from dma fence signal 191 */ 192static int 193svm_migrate_copy_done(struct amdgpu_device *adev, struct dma_fence *mfence) 194{ 195 int r = 0; 196 197 if (mfence) { 198 r = dma_fence_wait(mfence, false); 199 dma_fence_put(mfence); 200 pr_debug("sdma copy memory fence done\n"); 201 } 202 203 return r; 204} 205 206unsigned long 207svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr) 208{ 209 return (addr + adev->kfd.pgmap.range.start) >> PAGE_SHIFT; 210} 211 212static void 213svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn) 214{ 215 struct page *page; 216 217 page = pfn_to_page(pfn); 218 svm_range_bo_ref(prange->svm_bo); 219 page->zone_device_data = prange->svm_bo; 220 zone_device_page_init(page); 221} 222 223static void 224svm_migrate_put_vram_page(struct amdgpu_device *adev, unsigned long addr) 225{ 226 struct page *page; 227 228 page = pfn_to_page(svm_migrate_addr_to_pfn(adev, addr)); 229 unlock_page(page); 230 put_page(page); 231} 232 233static unsigned long 234svm_migrate_addr(struct amdgpu_device *adev, struct page *page) 235{ 236 unsigned long addr; 237 238 addr = page_to_pfn(page) << PAGE_SHIFT; 239 return (addr - adev->kfd.pgmap.range.start); 240} 241 242static struct page * 243svm_migrate_get_sys_page(struct vm_area_struct *vma, unsigned long addr) 244{ 245 struct page *page; 246 247 page = alloc_page_vma(GFP_HIGHUSER, vma, addr); 248 if (page) 249 lock_page(page); 250 251 return page; 252} 253 254static void svm_migrate_put_sys_page(unsigned long addr) 255{ 256 struct page *page; 257 258 page = pfn_to_page(addr >> PAGE_SHIFT); 259 unlock_page(page); 260 put_page(page); 261} 262 263static unsigned long svm_migrate_successful_pages(struct migrate_vma *migrate) 264{ 265 unsigned long cpages = 0; 266 unsigned long i; 267 268 for (i = 0; i < migrate->npages; i++) { 269 if (migrate->src[i] & MIGRATE_PFN_VALID && 270 migrate->src[i] & MIGRATE_PFN_MIGRATE) 271 cpages++; 272 } 273 return cpages; 274} 275 276static unsigned long svm_migrate_unsuccessful_pages(struct migrate_vma *migrate) 277{ 278 unsigned long upages = 0; 279 unsigned long i; 280 281 for (i = 0; i < migrate->npages; i++) { 282 if (migrate->src[i] & MIGRATE_PFN_VALID && 283 !(migrate->src[i] & MIGRATE_PFN_MIGRATE)) 284 upages++; 285 } 286 return upages; 287} 288 289static int 290svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange, 291 struct migrate_vma *migrate, struct dma_fence **mfence, 292 dma_addr_t *scratch, uint64_t ttm_res_offset) 293{ 294 uint64_t npages = migrate->cpages; 295 struct amdgpu_device *adev = node->adev; 296 struct device *dev = adev->dev; 297 struct amdgpu_res_cursor cursor; 298 dma_addr_t *src; 299 uint64_t *dst; 300 uint64_t i, j; 301 int r; 302 303 pr_debug("svms 0x%p [0x%lx 0x%lx 0x%llx]\n", prange->svms, prange->start, 304 prange->last, ttm_res_offset); 305 306 src = scratch; 307 dst = (uint64_t *)(scratch + npages); 308 309 amdgpu_res_first(prange->ttm_res, ttm_res_offset, 310 npages << PAGE_SHIFT, &cursor); 311 for (i = j = 0; i < npages; i++) { 312 struct page *spage; 313 314 dst[i] = cursor.start + (j << PAGE_SHIFT); 315 migrate->dst[i] = svm_migrate_addr_to_pfn(adev, dst[i]); 316 svm_migrate_get_vram_page(prange, migrate->dst[i]); 317 migrate->dst[i] = migrate_pfn(migrate->dst[i]); 318 319 spage = migrate_pfn_to_page(migrate->src[i]); 320 if (spage && !is_zone_device_page(spage)) { 321 src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE, 322 DMA_TO_DEVICE); 323 r = dma_mapping_error(dev, src[i]); 324 if (r) { 325 dev_err(dev, "%s: fail %d dma_map_page\n", 326 __func__, r); 327 goto out_free_vram_pages; 328 } 329 } else { 330 if (j) { 331 r = svm_migrate_copy_memory_gart( 332 adev, src + i - j, 333 dst + i - j, j, 334 FROM_RAM_TO_VRAM, 335 mfence); 336 if (r) 337 goto out_free_vram_pages; 338 amdgpu_res_next(&cursor, (j + 1) << PAGE_SHIFT); 339 j = 0; 340 } else { 341 amdgpu_res_next(&cursor, PAGE_SIZE); 342 } 343 continue; 344 } 345 346 pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n", 347 src[i] >> PAGE_SHIFT, page_to_pfn(spage)); 348 349 if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) { 350 r = svm_migrate_copy_memory_gart(adev, src + i - j, 351 dst + i - j, j + 1, 352 FROM_RAM_TO_VRAM, 353 mfence); 354 if (r) 355 goto out_free_vram_pages; 356 amdgpu_res_next(&cursor, (j + 1) * PAGE_SIZE); 357 j = 0; 358 } else { 359 j++; 360 } 361 } 362 363 r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j, 364 FROM_RAM_TO_VRAM, mfence); 365 366out_free_vram_pages: 367 if (r) { 368 pr_debug("failed %d to copy memory to vram\n", r); 369 while (i--) { 370 svm_migrate_put_vram_page(adev, dst[i]); 371 migrate->dst[i] = 0; 372 } 373 } 374 375#ifdef DEBUG_FORCE_MIXED_DOMAINS 376 for (i = 0, j = 0; i < npages; i += 4, j++) { 377 if (j & 1) 378 continue; 379 svm_migrate_put_vram_page(adev, dst[i]); 380 migrate->dst[i] = 0; 381 svm_migrate_put_vram_page(adev, dst[i + 1]); 382 migrate->dst[i + 1] = 0; 383 svm_migrate_put_vram_page(adev, dst[i + 2]); 384 migrate->dst[i + 2] = 0; 385 svm_migrate_put_vram_page(adev, dst[i + 3]); 386 migrate->dst[i + 3] = 0; 387 } 388#endif 389 390 return r; 391} 392 393static long 394svm_migrate_vma_to_vram(struct kfd_node *node, struct svm_range *prange, 395 struct vm_area_struct *vma, uint64_t start, 396 uint64_t end, uint32_t trigger, uint64_t ttm_res_offset) 397{ 398 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); 399 uint64_t npages = (end - start) >> PAGE_SHIFT; 400 struct amdgpu_device *adev = node->adev; 401 struct kfd_process_device *pdd; 402 struct dma_fence *mfence = NULL; 403 struct migrate_vma migrate = { 0 }; 404 unsigned long cpages = 0; 405 dma_addr_t *scratch; 406 void *buf; 407 int r = -ENOMEM; 408 409 memset(&migrate, 0, sizeof(migrate)); 410 migrate.vma = vma; 411 migrate.start = start; 412 migrate.end = end; 413 migrate.flags = MIGRATE_VMA_SELECT_SYSTEM; 414 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); 415 416 buf = kvcalloc(npages, 417 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t), 418 GFP_KERNEL); 419 if (!buf) 420 goto out; 421 422 migrate.src = buf; 423 migrate.dst = migrate.src + npages; 424 scratch = (dma_addr_t *)(migrate.dst + npages); 425 426 kfd_smi_event_migration_start(node, p->lead_thread->pid, 427 start >> PAGE_SHIFT, end >> PAGE_SHIFT, 428 0, node->id, prange->prefetch_loc, 429 prange->preferred_loc, trigger); 430 431 r = migrate_vma_setup(&migrate); 432 if (r) { 433 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", 434 __func__, r, prange->start, prange->last); 435 goto out_free; 436 } 437 438 cpages = migrate.cpages; 439 if (!cpages) { 440 pr_debug("failed collect migrate sys pages [0x%lx 0x%lx]\n", 441 prange->start, prange->last); 442 goto out_free; 443 } 444 if (cpages != npages) 445 pr_debug("partial migration, 0x%lx/0x%llx pages migrated\n", 446 cpages, npages); 447 else 448 pr_debug("0x%lx pages migrated\n", cpages); 449 450 r = svm_migrate_copy_to_vram(node, prange, &migrate, &mfence, scratch, ttm_res_offset); 451 migrate_vma_pages(&migrate); 452 453 pr_debug("successful/cpages/npages 0x%lx/0x%lx/0x%lx\n", 454 svm_migrate_successful_pages(&migrate), cpages, migrate.npages); 455 456 svm_migrate_copy_done(adev, mfence); 457 migrate_vma_finalize(&migrate); 458 459 kfd_smi_event_migration_end(node, p->lead_thread->pid, 460 start >> PAGE_SHIFT, end >> PAGE_SHIFT, 461 0, node->id, trigger); 462 463 svm_range_dma_unmap(adev->dev, scratch, 0, npages); 464 465out_free: 466 kvfree(buf); 467out: 468 if (!r && cpages) { 469 pdd = svm_range_get_pdd_by_node(prange, node); 470 if (pdd) 471 WRITE_ONCE(pdd->page_in, pdd->page_in + cpages); 472 473 return cpages; 474 } 475 return r; 476} 477 478/** 479 * svm_migrate_ram_to_vram - migrate svm range from system to device 480 * @prange: range structure 481 * @best_loc: the device to migrate to 482 * @mm: the process mm structure 483 * @trigger: reason of migration 484 * 485 * Context: Process context, caller hold mmap read lock, svms lock, prange lock 486 * 487 * Return: 488 * 0 - OK, otherwise error code 489 */ 490static int 491svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc, 492 struct mm_struct *mm, uint32_t trigger) 493{ 494 unsigned long addr, start, end; 495 struct vm_area_struct *vma; 496 uint64_t ttm_res_offset; 497 struct kfd_node *node; 498 unsigned long cpages = 0; 499 long r = 0; 500 501 if (prange->actual_loc == best_loc) { 502 pr_debug("svms 0x%p [0x%lx 0x%lx] already on best_loc 0x%x\n", 503 prange->svms, prange->start, prange->last, best_loc); 504 return 0; 505 } 506 507 node = svm_range_get_node_by_id(prange, best_loc); 508 if (!node) { 509 pr_debug("failed to get kfd node by id 0x%x\n", best_loc); 510 return -ENODEV; 511 } 512 513 pr_debug("svms 0x%p [0x%lx 0x%lx] to gpu 0x%x\n", prange->svms, 514 prange->start, prange->last, best_loc); 515 516 start = prange->start << PAGE_SHIFT; 517 end = (prange->last + 1) << PAGE_SHIFT; 518 519 r = amdgpu_amdkfd_reserve_mem_limit(node->adev, 520 prange->npages * PAGE_SIZE, 521 KFD_IOC_ALLOC_MEM_FLAGS_VRAM, 522 node->xcp ? node->xcp->id : 0); 523 if (r) { 524 dev_dbg(node->adev->dev, "failed to reserve VRAM, r: %ld\n", r); 525 return -ENOSPC; 526 } 527 528 r = svm_range_vram_node_new(node, prange, true); 529 if (r) { 530 dev_dbg(node->adev->dev, "fail %ld to alloc vram\n", r); 531 goto out; 532 } 533 ttm_res_offset = prange->offset << PAGE_SHIFT; 534 535 for (addr = start; addr < end;) { 536 unsigned long next; 537 538 vma = vma_lookup(mm, addr); 539 if (!vma) 540 break; 541 542 next = min(vma->vm_end, end); 543 r = svm_migrate_vma_to_vram(node, prange, vma, addr, next, trigger, ttm_res_offset); 544 if (r < 0) { 545 pr_debug("failed %ld to migrate\n", r); 546 break; 547 } else { 548 cpages += r; 549 } 550 ttm_res_offset += next - addr; 551 addr = next; 552 } 553 554 if (cpages) { 555 prange->actual_loc = best_loc; 556 svm_range_free_dma_mappings(prange, true); 557 } else { 558 svm_range_vram_node_free(prange); 559 } 560 561out: 562 amdgpu_amdkfd_unreserve_mem_limit(node->adev, 563 prange->npages * PAGE_SIZE, 564 KFD_IOC_ALLOC_MEM_FLAGS_VRAM, 565 node->xcp ? node->xcp->id : 0); 566 return r < 0 ? r : 0; 567} 568 569static void svm_migrate_page_free(struct page *page) 570{ 571 struct svm_range_bo *svm_bo = page->zone_device_data; 572 573 if (svm_bo) { 574 pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref)); 575 svm_range_bo_unref_async(svm_bo); 576 } 577} 578 579static int 580svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange, 581 struct migrate_vma *migrate, struct dma_fence **mfence, 582 dma_addr_t *scratch, uint64_t npages) 583{ 584 struct device *dev = adev->dev; 585 uint64_t *src; 586 dma_addr_t *dst; 587 struct page *dpage; 588 uint64_t i = 0, j; 589 uint64_t addr; 590 int r = 0; 591 592 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, 593 prange->last); 594 595 addr = prange->start << PAGE_SHIFT; 596 597 src = (uint64_t *)(scratch + npages); 598 dst = scratch; 599 600 for (i = 0, j = 0; i < npages; i++, addr += PAGE_SIZE) { 601 struct page *spage; 602 603 spage = migrate_pfn_to_page(migrate->src[i]); 604 if (!spage || !is_zone_device_page(spage)) { 605 pr_debug("invalid page. Could be in CPU already svms 0x%p [0x%lx 0x%lx]\n", 606 prange->svms, prange->start, prange->last); 607 if (j) { 608 r = svm_migrate_copy_memory_gart(adev, dst + i - j, 609 src + i - j, j, 610 FROM_VRAM_TO_RAM, 611 mfence); 612 if (r) 613 goto out_oom; 614 j = 0; 615 } 616 continue; 617 } 618 src[i] = svm_migrate_addr(adev, spage); 619 if (j > 0 && src[i] != src[i - 1] + PAGE_SIZE) { 620 r = svm_migrate_copy_memory_gart(adev, dst + i - j, 621 src + i - j, j, 622 FROM_VRAM_TO_RAM, 623 mfence); 624 if (r) 625 goto out_oom; 626 j = 0; 627 } 628 629 dpage = svm_migrate_get_sys_page(migrate->vma, addr); 630 if (!dpage) { 631 pr_debug("failed get page svms 0x%p [0x%lx 0x%lx]\n", 632 prange->svms, prange->start, prange->last); 633 r = -ENOMEM; 634 goto out_oom; 635 } 636 637 dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_FROM_DEVICE); 638 r = dma_mapping_error(dev, dst[i]); 639 if (r) { 640 dev_err(adev->dev, "%s: fail %d dma_map_page\n", __func__, r); 641 goto out_oom; 642 } 643 644 pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n", 645 dst[i] >> PAGE_SHIFT, page_to_pfn(dpage)); 646 647 migrate->dst[i] = migrate_pfn(page_to_pfn(dpage)); 648 j++; 649 } 650 651 r = svm_migrate_copy_memory_gart(adev, dst + i - j, src + i - j, j, 652 FROM_VRAM_TO_RAM, mfence); 653 654out_oom: 655 if (r) { 656 pr_debug("failed %d copy to ram\n", r); 657 while (i--) { 658 svm_migrate_put_sys_page(dst[i]); 659 migrate->dst[i] = 0; 660 } 661 } 662 663 return r; 664} 665 666/** 667 * svm_migrate_vma_to_ram - migrate range inside one vma from device to system 668 * 669 * @prange: svm range structure 670 * @vma: vm_area_struct that range [start, end] belongs to 671 * @start: range start virtual address in pages 672 * @end: range end virtual address in pages 673 * @node: kfd node device to migrate from 674 * @trigger: reason of migration 675 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback 676 * 677 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex 678 * 679 * Return: 680 * 0 - success with all pages migrated 681 * negative values - indicate error 682 * positive values - partial migration, number of pages not migrated 683 */ 684static long 685svm_migrate_vma_to_ram(struct kfd_node *node, struct svm_range *prange, 686 struct vm_area_struct *vma, uint64_t start, uint64_t end, 687 uint32_t trigger, struct page *fault_page) 688{ 689 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); 690 uint64_t npages = (end - start) >> PAGE_SHIFT; 691 unsigned long upages = npages; 692 unsigned long cpages = 0; 693 struct amdgpu_device *adev = node->adev; 694 struct kfd_process_device *pdd; 695 struct dma_fence *mfence = NULL; 696 struct migrate_vma migrate = { 0 }; 697 dma_addr_t *scratch; 698 void *buf; 699 int r = -ENOMEM; 700 701 memset(&migrate, 0, sizeof(migrate)); 702 migrate.vma = vma; 703 migrate.start = start; 704 migrate.end = end; 705 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); 706 if (adev->gmc.xgmi.connected_to_cpu) 707 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_COHERENT; 708 else 709 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; 710 711 buf = kvcalloc(npages, 712 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t), 713 GFP_KERNEL); 714 if (!buf) 715 goto out; 716 717 migrate.src = buf; 718 migrate.dst = migrate.src + npages; 719 migrate.fault_page = fault_page; 720 scratch = (dma_addr_t *)(migrate.dst + npages); 721 722 kfd_smi_event_migration_start(node, p->lead_thread->pid, 723 start >> PAGE_SHIFT, end >> PAGE_SHIFT, 724 node->id, 0, prange->prefetch_loc, 725 prange->preferred_loc, trigger); 726 727 r = migrate_vma_setup(&migrate); 728 if (r) { 729 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", 730 __func__, r, prange->start, prange->last); 731 goto out_free; 732 } 733 734 cpages = migrate.cpages; 735 if (!cpages) { 736 pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n", 737 prange->start, prange->last); 738 upages = svm_migrate_unsuccessful_pages(&migrate); 739 goto out_free; 740 } 741 if (cpages != npages) 742 pr_debug("partial migration, 0x%lx/0x%llx pages migrated\n", 743 cpages, npages); 744 else 745 pr_debug("0x%lx pages migrated\n", cpages); 746 747 r = svm_migrate_copy_to_ram(adev, prange, &migrate, &mfence, 748 scratch, npages); 749 migrate_vma_pages(&migrate); 750 751 upages = svm_migrate_unsuccessful_pages(&migrate); 752 pr_debug("unsuccessful/cpages/npages 0x%lx/0x%lx/0x%lx\n", 753 upages, cpages, migrate.npages); 754 755 svm_migrate_copy_done(adev, mfence); 756 migrate_vma_finalize(&migrate); 757 758 kfd_smi_event_migration_end(node, p->lead_thread->pid, 759 start >> PAGE_SHIFT, end >> PAGE_SHIFT, 760 node->id, 0, trigger); 761 762 svm_range_dma_unmap(adev->dev, scratch, 0, npages); 763 764out_free: 765 kvfree(buf); 766out: 767 if (!r && cpages) { 768 pdd = svm_range_get_pdd_by_node(prange, node); 769 if (pdd) 770 WRITE_ONCE(pdd->page_out, pdd->page_out + cpages); 771 } 772 return r ? r : upages; 773} 774 775/** 776 * svm_migrate_vram_to_ram - migrate svm range from device to system 777 * @prange: range structure 778 * @mm: process mm, use current->mm if NULL 779 * @trigger: reason of migration 780 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback 781 * 782 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex 783 * 784 * Return: 785 * 0 - OK, otherwise error code 786 */ 787int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm, 788 uint32_t trigger, struct page *fault_page) 789{ 790 struct kfd_node *node; 791 struct vm_area_struct *vma; 792 unsigned long addr; 793 unsigned long start; 794 unsigned long end; 795 unsigned long upages = 0; 796 long r = 0; 797 798 if (!prange->actual_loc) { 799 pr_debug("[0x%lx 0x%lx] already migrated to ram\n", 800 prange->start, prange->last); 801 return 0; 802 } 803 804 node = svm_range_get_node_by_id(prange, prange->actual_loc); 805 if (!node) { 806 pr_debug("failed to get kfd node by id 0x%x\n", prange->actual_loc); 807 return -ENODEV; 808 } 809 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] from gpu 0x%x to ram\n", 810 prange->svms, prange, prange->start, prange->last, 811 prange->actual_loc); 812 813 start = prange->start << PAGE_SHIFT; 814 end = (prange->last + 1) << PAGE_SHIFT; 815 816 for (addr = start; addr < end;) { 817 unsigned long next; 818 819 vma = vma_lookup(mm, addr); 820 if (!vma) { 821 pr_debug("failed to find vma for prange %p\n", prange); 822 r = -EFAULT; 823 break; 824 } 825 826 next = min(vma->vm_end, end); 827 r = svm_migrate_vma_to_ram(node, prange, vma, addr, next, trigger, 828 fault_page); 829 if (r < 0) { 830 pr_debug("failed %ld to migrate prange %p\n", r, prange); 831 break; 832 } else { 833 upages += r; 834 } 835 addr = next; 836 } 837 838 if (r >= 0 && !upages) { 839 svm_range_vram_node_free(prange); 840 prange->actual_loc = 0; 841 } 842 843 return r < 0 ? r : 0; 844} 845 846/** 847 * svm_migrate_vram_to_vram - migrate svm range from device to device 848 * @prange: range structure 849 * @best_loc: the device to migrate to 850 * @mm: process mm, use current->mm if NULL 851 * @trigger: reason of migration 852 * 853 * Context: Process context, caller hold mmap read lock, svms lock, prange lock 854 * 855 * Return: 856 * 0 - OK, otherwise error code 857 */ 858static int 859svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc, 860 struct mm_struct *mm, uint32_t trigger) 861{ 862 int r, retries = 3; 863 864 /* 865 * TODO: for both devices with PCIe large bar or on same xgmi hive, skip 866 * system memory as migration bridge 867 */ 868 869 pr_debug("from gpu 0x%x to gpu 0x%x\n", prange->actual_loc, best_loc); 870 871 do { 872 r = svm_migrate_vram_to_ram(prange, mm, trigger, NULL); 873 if (r) 874 return r; 875 } while (prange->actual_loc && --retries); 876 877 if (prange->actual_loc) 878 return -EDEADLK; 879 880 return svm_migrate_ram_to_vram(prange, best_loc, mm, trigger); 881} 882 883int 884svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc, 885 struct mm_struct *mm, uint32_t trigger) 886{ 887 if (!prange->actual_loc) 888 return svm_migrate_ram_to_vram(prange, best_loc, mm, trigger); 889 else 890 return svm_migrate_vram_to_vram(prange, best_loc, mm, trigger); 891 892} 893 894/** 895 * svm_migrate_to_ram - CPU page fault handler 896 * @vmf: CPU vm fault vma, address 897 * 898 * Context: vm fault handler, caller holds the mmap read lock 899 * 900 * Return: 901 * 0 - OK 902 * VM_FAULT_SIGBUS - notice application to have SIGBUS page fault 903 */ 904static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf) 905{ 906 unsigned long addr = vmf->address; 907 struct svm_range_bo *svm_bo; 908 enum svm_work_list_ops op; 909 struct svm_range *parent; 910 struct svm_range *prange; 911 struct kfd_process *p; 912 struct mm_struct *mm; 913 int r = 0; 914 915 svm_bo = vmf->page->zone_device_data; 916 if (!svm_bo) { 917 pr_debug("failed get device page at addr 0x%lx\n", addr); 918 return VM_FAULT_SIGBUS; 919 } 920 if (!mmget_not_zero(svm_bo->eviction_fence->mm)) { 921 pr_debug("addr 0x%lx of process mm is destroyed\n", addr); 922 return VM_FAULT_SIGBUS; 923 } 924 925 mm = svm_bo->eviction_fence->mm; 926 if (mm != vmf->vma->vm_mm) 927 pr_debug("addr 0x%lx is COW mapping in child process\n", addr); 928 929 p = kfd_lookup_process_by_mm(mm); 930 if (!p) { 931 pr_debug("failed find process at fault address 0x%lx\n", addr); 932 r = VM_FAULT_SIGBUS; 933 goto out_mmput; 934 } 935 if (READ_ONCE(p->svms.faulting_task) == current) { 936 pr_debug("skipping ram migration\n"); 937 r = 0; 938 goto out_unref_process; 939 } 940 941 pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr); 942 addr >>= PAGE_SHIFT; 943 944 mutex_lock(&p->svms.lock); 945 946 prange = svm_range_from_addr(&p->svms, addr, &parent); 947 if (!prange) { 948 pr_debug("failed get range svms 0x%p addr 0x%lx\n", &p->svms, addr); 949 r = -EFAULT; 950 goto out_unlock_svms; 951 } 952 953 mutex_lock(&parent->migrate_mutex); 954 if (prange != parent) 955 mutex_lock_nested(&prange->migrate_mutex, 1); 956 957 if (!prange->actual_loc) 958 goto out_unlock_prange; 959 960 svm_range_lock(parent); 961 if (prange != parent) 962 mutex_lock_nested(&prange->lock, 1); 963 r = svm_range_split_by_granularity(p, mm, addr, parent, prange); 964 if (prange != parent) 965 mutex_unlock(&prange->lock); 966 svm_range_unlock(parent); 967 if (r) { 968 pr_debug("failed %d to split range by granularity\n", r); 969 goto out_unlock_prange; 970 } 971 972 r = svm_migrate_vram_to_ram(prange, vmf->vma->vm_mm, 973 KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU, 974 vmf->page); 975 if (r) 976 pr_debug("failed %d migrate svms 0x%p range 0x%p [0x%lx 0x%lx]\n", 977 r, prange->svms, prange, prange->start, prange->last); 978 979 /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ 980 if (p->xnack_enabled && parent == prange) 981 op = SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP; 982 else 983 op = SVM_OP_UPDATE_RANGE_NOTIFIER; 984 svm_range_add_list_work(&p->svms, parent, mm, op); 985 schedule_deferred_list_work(&p->svms); 986 987out_unlock_prange: 988 if (prange != parent) 989 mutex_unlock(&prange->migrate_mutex); 990 mutex_unlock(&parent->migrate_mutex); 991out_unlock_svms: 992 mutex_unlock(&p->svms.lock); 993out_unref_process: 994 pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); 995 kfd_unref_process(p); 996out_mmput: 997 mmput(mm); 998 return r ? VM_FAULT_SIGBUS : 0; 999} 1000 1001static const struct dev_pagemap_ops svm_migrate_pgmap_ops = { 1002 .page_free = svm_migrate_page_free, 1003 .migrate_to_ram = svm_migrate_to_ram, 1004}; 1005 1006/* Each VRAM page uses sizeof(struct page) on system memory */ 1007#define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page)) 1008 1009int kgd2kfd_init_zone_device(struct amdgpu_device *adev) 1010{ 1011 struct amdgpu_kfd_dev *kfddev = &adev->kfd; 1012 struct dev_pagemap *pgmap; 1013 struct resource *res = NULL; 1014 unsigned long size; 1015 void *r; 1016 1017 /* Page migration works on gfx9 or newer */ 1018 if (adev->ip_versions[GC_HWIP][0] < IP_VERSION(9, 0, 1)) 1019 return -EINVAL; 1020 1021 if (adev->gmc.is_app_apu) 1022 return 0; 1023 1024 pgmap = &kfddev->pgmap; 1025 memset(pgmap, 0, sizeof(*pgmap)); 1026 1027 /* TODO: register all vram to HMM for now. 1028 * should remove reserved size 1029 */ 1030 size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20); 1031 if (adev->gmc.xgmi.connected_to_cpu) { 1032 pgmap->range.start = adev->gmc.aper_base; 1033 pgmap->range.end = adev->gmc.aper_base + adev->gmc.aper_size - 1; 1034 pgmap->type = MEMORY_DEVICE_COHERENT; 1035 } else { 1036 res = devm_request_free_mem_region(adev->dev, &iomem_resource, size); 1037 if (IS_ERR(res)) 1038 return PTR_ERR(res); 1039 pgmap->range.start = res->start; 1040 pgmap->range.end = res->end; 1041 pgmap->type = MEMORY_DEVICE_PRIVATE; 1042 } 1043 1044 pgmap->nr_range = 1; 1045 pgmap->ops = &svm_migrate_pgmap_ops; 1046 pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev); 1047 pgmap->flags = 0; 1048 /* Device manager releases device-specific resources, memory region and 1049 * pgmap when driver disconnects from device. 1050 */ 1051 r = devm_memremap_pages(adev->dev, pgmap); 1052 if (IS_ERR(r)) { 1053 pr_err("failed to register HMM device memory\n"); 1054 if (pgmap->type == MEMORY_DEVICE_PRIVATE) 1055 devm_release_mem_region(adev->dev, res->start, resource_size(res)); 1056 /* Disable SVM support capability */ 1057 pgmap->type = 0; 1058 return PTR_ERR(r); 1059 } 1060 1061 pr_debug("reserve %ldMB system memory for VRAM pages struct\n", 1062 SVM_HMM_PAGE_STRUCT_SIZE(size) >> 20); 1063 1064 amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size)); 1065 1066 pr_info("HMM registered %ldMB device memory\n", size >> 20); 1067 1068 return 0; 1069} 1070