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_mn.h" 32 #include "amdgpu_res_cursor.h" 33 #include "kfd_priv.h" 34 #include "kfd_svm.h" 35 #include "kfd_migrate.h" 36 37 #ifdef dev_fmt 38 #undef dev_fmt 39 #endif 40 #define dev_fmt(fmt) "kfd_migrate: " fmt 41 42 static uint64_t 43 svm_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 48 static int 49 svm_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, num_dw * 4 + num_bytes, 68 AMDGPU_IB_POOL_DELAYED, &job); 69 if (r) 70 return r; 71 72 src_addr = num_dw * 4; 73 src_addr += job->ibs[0].gpu_addr; 74 75 dst_addr = amdgpu_bo_gpu_offset(adev->gart.bo); 76 amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr, 77 dst_addr, num_bytes, false); 78 79 amdgpu_ring_pad_ib(ring, &job->ibs[0]); 80 WARN_ON(job->ibs[0].length_dw > num_dw); 81 82 pte_flags = AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE; 83 pte_flags |= AMDGPU_PTE_SYSTEM | AMDGPU_PTE_SNOOPED; 84 if (!(flags & KFD_IOCTL_SVM_FLAG_GPU_RO)) 85 pte_flags |= AMDGPU_PTE_WRITEABLE; 86 pte_flags |= adev->gart.gart_pte_flags; 87 88 cpu_addr = &job->ibs[0].ptr[num_dw]; 89 90 amdgpu_gart_map(adev, 0, npages, addr, pte_flags, cpu_addr); 91 r = amdgpu_job_submit(job, &adev->mman.entity, 92 AMDGPU_FENCE_OWNER_UNDEFINED, &fence); 93 if (r) 94 goto error_free; 95 96 dma_fence_put(fence); 97 98 return r; 99 100 error_free: 101 amdgpu_job_free(job); 102 return r; 103 } 104 105 /** 106 * svm_migrate_copy_memory_gart - sdma copy data between ram and vram 107 * 108 * @adev: amdgpu device the sdma ring running 109 * @sys: system DMA pointer to be copied 110 * @vram: vram destination DMA pointer 111 * @npages: number of pages to copy 112 * @direction: enum MIGRATION_COPY_DIR 113 * @mfence: output, sdma fence to signal after sdma is done 114 * 115 * ram address uses GART table continuous entries mapping to ram pages, 116 * vram address uses direct mapping of vram pages, which must have npages 117 * number of continuous pages. 118 * GART update and sdma uses same buf copy function ring, sdma is splited to 119 * multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, wait for 120 * the last sdma finish fence which is returned to check copy memory is done. 121 * 122 * Context: Process context, takes and releases gtt_window_lock 123 * 124 * Return: 125 * 0 - OK, otherwise error code 126 */ 127 128 static int 129 svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys, 130 uint64_t *vram, uint64_t npages, 131 enum MIGRATION_COPY_DIR direction, 132 struct dma_fence **mfence) 133 { 134 const uint64_t GTT_MAX_PAGES = AMDGPU_GTT_MAX_TRANSFER_SIZE; 135 struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; 136 uint64_t gart_s, gart_d; 137 struct dma_fence *next; 138 uint64_t size; 139 int r; 140 141 mutex_lock(&adev->mman.gtt_window_lock); 142 143 while (npages) { 144 size = min(GTT_MAX_PAGES, npages); 145 146 if (direction == FROM_VRAM_TO_RAM) { 147 gart_s = svm_migrate_direct_mapping_addr(adev, *vram); 148 r = svm_migrate_gart_map(ring, size, sys, &gart_d, 0); 149 150 } else if (direction == FROM_RAM_TO_VRAM) { 151 r = svm_migrate_gart_map(ring, size, sys, &gart_s, 152 KFD_IOCTL_SVM_FLAG_GPU_RO); 153 gart_d = svm_migrate_direct_mapping_addr(adev, *vram); 154 } 155 if (r) { 156 dev_err(adev->dev, "fail %d create gart mapping\n", r); 157 goto out_unlock; 158 } 159 160 r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE, 161 NULL, &next, false, true, false); 162 if (r) { 163 dev_err(adev->dev, "fail %d to copy memory\n", r); 164 goto out_unlock; 165 } 166 167 dma_fence_put(*mfence); 168 *mfence = next; 169 npages -= size; 170 if (npages) { 171 sys += size; 172 vram += size; 173 } 174 } 175 176 out_unlock: 177 mutex_unlock(&adev->mman.gtt_window_lock); 178 179 return r; 180 } 181 182 /** 183 * svm_migrate_copy_done - wait for memory copy sdma is done 184 * 185 * @adev: amdgpu device the sdma memory copy is executing on 186 * @mfence: migrate fence 187 * 188 * Wait for dma fence is signaled, if the copy ssplit into multiple sdma 189 * operations, this is the last sdma operation fence. 190 * 191 * Context: called after svm_migrate_copy_memory 192 * 193 * Return: 194 * 0 - success 195 * otherwise - error code from dma fence signal 196 */ 197 static int 198 svm_migrate_copy_done(struct amdgpu_device *adev, struct dma_fence *mfence) 199 { 200 int r = 0; 201 202 if (mfence) { 203 r = dma_fence_wait(mfence, false); 204 dma_fence_put(mfence); 205 pr_debug("sdma copy memory fence done\n"); 206 } 207 208 return r; 209 } 210 211 unsigned long 212 svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr) 213 { 214 return (addr + adev->kfd.dev->pgmap.range.start) >> PAGE_SHIFT; 215 } 216 217 static void 218 svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn) 219 { 220 struct page *page; 221 222 page = pfn_to_page(pfn); 223 svm_range_bo_ref(prange->svm_bo); 224 page->zone_device_data = prange->svm_bo; 225 lock_page(page); 226 } 227 228 static void 229 svm_migrate_put_vram_page(struct amdgpu_device *adev, unsigned long addr) 230 { 231 struct page *page; 232 233 page = pfn_to_page(svm_migrate_addr_to_pfn(adev, addr)); 234 unlock_page(page); 235 put_page(page); 236 } 237 238 static unsigned long 239 svm_migrate_addr(struct amdgpu_device *adev, struct page *page) 240 { 241 unsigned long addr; 242 243 addr = page_to_pfn(page) << PAGE_SHIFT; 244 return (addr - adev->kfd.dev->pgmap.range.start); 245 } 246 247 static struct page * 248 svm_migrate_get_sys_page(struct vm_area_struct *vma, unsigned long addr) 249 { 250 struct page *page; 251 252 page = alloc_page_vma(GFP_HIGHUSER, vma, addr); 253 if (page) 254 lock_page(page); 255 256 return page; 257 } 258 259 static void svm_migrate_put_sys_page(unsigned long addr) 260 { 261 struct page *page; 262 263 page = pfn_to_page(addr >> PAGE_SHIFT); 264 unlock_page(page); 265 put_page(page); 266 } 267 268 static unsigned long svm_migrate_successful_pages(struct migrate_vma *migrate) 269 { 270 unsigned long cpages = 0; 271 unsigned long i; 272 273 for (i = 0; i < migrate->npages; i++) { 274 if (migrate->src[i] & MIGRATE_PFN_VALID && 275 migrate->src[i] & MIGRATE_PFN_MIGRATE) 276 cpages++; 277 } 278 return cpages; 279 } 280 281 static unsigned long svm_migrate_unsuccessful_pages(struct migrate_vma *migrate) 282 { 283 unsigned long upages = 0; 284 unsigned long i; 285 286 for (i = 0; i < migrate->npages; i++) { 287 if (migrate->src[i] & MIGRATE_PFN_VALID && 288 !(migrate->src[i] & MIGRATE_PFN_MIGRATE)) 289 upages++; 290 } 291 return upages; 292 } 293 294 static int 295 svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange, 296 struct migrate_vma *migrate, struct dma_fence **mfence, 297 dma_addr_t *scratch) 298 { 299 uint64_t npages = migrate->cpages; 300 struct device *dev = adev->dev; 301 struct amdgpu_res_cursor cursor; 302 dma_addr_t *src; 303 uint64_t *dst; 304 uint64_t i, j; 305 int r; 306 307 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, 308 prange->last); 309 310 src = scratch; 311 dst = (uint64_t *)(scratch + npages); 312 313 r = svm_range_vram_node_new(adev, prange, true); 314 if (r) { 315 dev_dbg(adev->dev, "fail %d to alloc vram\n", r); 316 goto out; 317 } 318 319 amdgpu_res_first(prange->ttm_res, prange->offset << PAGE_SHIFT, 320 npages << PAGE_SHIFT, &cursor); 321 for (i = j = 0; i < npages; i++) { 322 struct page *spage; 323 324 spage = migrate_pfn_to_page(migrate->src[i]); 325 if (spage && !is_zone_device_page(spage)) { 326 dst[i] = cursor.start + (j << PAGE_SHIFT); 327 migrate->dst[i] = svm_migrate_addr_to_pfn(adev, dst[i]); 328 svm_migrate_get_vram_page(prange, migrate->dst[i]); 329 migrate->dst[i] = migrate_pfn(migrate->dst[i]); 330 src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE, 331 DMA_TO_DEVICE); 332 r = dma_mapping_error(dev, src[i]); 333 if (r) { 334 dev_err(adev->dev, "%s: fail %d dma_map_page\n", 335 __func__, r); 336 goto out_free_vram_pages; 337 } 338 } else { 339 if (j) { 340 r = svm_migrate_copy_memory_gart( 341 adev, src + i - j, 342 dst + i - j, j, 343 FROM_RAM_TO_VRAM, 344 mfence); 345 if (r) 346 goto out_free_vram_pages; 347 amdgpu_res_next(&cursor, j << PAGE_SHIFT); 348 j = 0; 349 } else { 350 amdgpu_res_next(&cursor, PAGE_SIZE); 351 } 352 continue; 353 } 354 355 pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n", 356 src[i] >> PAGE_SHIFT, page_to_pfn(spage)); 357 358 if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) { 359 r = svm_migrate_copy_memory_gart(adev, src + i - j, 360 dst + i - j, j + 1, 361 FROM_RAM_TO_VRAM, 362 mfence); 363 if (r) 364 goto out_free_vram_pages; 365 amdgpu_res_next(&cursor, (j + 1) * PAGE_SIZE); 366 j = 0; 367 } else { 368 j++; 369 } 370 } 371 372 r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j, 373 FROM_RAM_TO_VRAM, mfence); 374 375 out_free_vram_pages: 376 if (r) { 377 pr_debug("failed %d to copy memory to vram\n", r); 378 while (i--) { 379 svm_migrate_put_vram_page(adev, dst[i]); 380 migrate->dst[i] = 0; 381 } 382 } 383 384 #ifdef DEBUG_FORCE_MIXED_DOMAINS 385 for (i = 0, j = 0; i < npages; i += 4, j++) { 386 if (j & 1) 387 continue; 388 svm_migrate_put_vram_page(adev, dst[i]); 389 migrate->dst[i] = 0; 390 svm_migrate_put_vram_page(adev, dst[i + 1]); 391 migrate->dst[i + 1] = 0; 392 svm_migrate_put_vram_page(adev, dst[i + 2]); 393 migrate->dst[i + 2] = 0; 394 svm_migrate_put_vram_page(adev, dst[i + 3]); 395 migrate->dst[i + 3] = 0; 396 } 397 #endif 398 out: 399 return r; 400 } 401 402 static long 403 svm_migrate_vma_to_vram(struct amdgpu_device *adev, struct svm_range *prange, 404 struct vm_area_struct *vma, uint64_t start, 405 uint64_t end) 406 { 407 uint64_t npages = (end - start) >> PAGE_SHIFT; 408 struct kfd_process_device *pdd; 409 struct dma_fence *mfence = NULL; 410 struct migrate_vma migrate; 411 unsigned long cpages = 0; 412 dma_addr_t *scratch; 413 size_t size; 414 void *buf; 415 int r = -ENOMEM; 416 417 memset(&migrate, 0, sizeof(migrate)); 418 migrate.vma = vma; 419 migrate.start = start; 420 migrate.end = end; 421 migrate.flags = MIGRATE_VMA_SELECT_SYSTEM; 422 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); 423 424 size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t); 425 size *= npages; 426 buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); 427 if (!buf) 428 goto out; 429 430 migrate.src = buf; 431 migrate.dst = migrate.src + npages; 432 scratch = (dma_addr_t *)(migrate.dst + npages); 433 434 r = migrate_vma_setup(&migrate); 435 if (r) { 436 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", 437 __func__, r, prange->start, prange->last); 438 goto out_free; 439 } 440 441 cpages = migrate.cpages; 442 if (!cpages) { 443 pr_debug("failed collect migrate sys pages [0x%lx 0x%lx]\n", 444 prange->start, prange->last); 445 goto out_free; 446 } 447 if (cpages != npages) 448 pr_debug("partial migration, 0x%lx/0x%llx pages migrated\n", 449 cpages, npages); 450 else 451 pr_debug("0x%lx pages migrated\n", cpages); 452 453 r = svm_migrate_copy_to_vram(adev, prange, &migrate, &mfence, scratch); 454 migrate_vma_pages(&migrate); 455 456 pr_debug("successful/cpages/npages 0x%lx/0x%lx/0x%lx\n", 457 svm_migrate_successful_pages(&migrate), cpages, migrate.npages); 458 459 svm_migrate_copy_done(adev, mfence); 460 migrate_vma_finalize(&migrate); 461 462 svm_range_dma_unmap(adev->dev, scratch, 0, npages); 463 svm_range_free_dma_mappings(prange); 464 465 out_free: 466 kvfree(buf); 467 out: 468 if (!r && cpages) { 469 pdd = svm_range_get_pdd_by_adev(prange, adev); 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 * 484 * Context: Process context, caller hold mmap read lock, svms lock, prange lock 485 * 486 * Return: 487 * 0 - OK, otherwise error code 488 */ 489 static int 490 svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc, 491 struct mm_struct *mm) 492 { 493 unsigned long addr, start, end; 494 struct vm_area_struct *vma; 495 struct amdgpu_device *adev; 496 unsigned long cpages = 0; 497 long r = 0; 498 499 if (prange->actual_loc == best_loc) { 500 pr_debug("svms 0x%p [0x%lx 0x%lx] already on best_loc 0x%x\n", 501 prange->svms, prange->start, prange->last, best_loc); 502 return 0; 503 } 504 505 adev = svm_range_get_adev_by_id(prange, best_loc); 506 if (!adev) { 507 pr_debug("failed to get device by id 0x%x\n", best_loc); 508 return -ENODEV; 509 } 510 511 pr_debug("svms 0x%p [0x%lx 0x%lx] to gpu 0x%x\n", prange->svms, 512 prange->start, prange->last, best_loc); 513 514 /* FIXME: workaround for page locking bug with invalid pages */ 515 svm_range_prefault(prange, mm, SVM_ADEV_PGMAP_OWNER(adev)); 516 517 start = prange->start << PAGE_SHIFT; 518 end = (prange->last + 1) << PAGE_SHIFT; 519 520 for (addr = start; addr < end;) { 521 unsigned long next; 522 523 vma = find_vma(mm, addr); 524 if (!vma || addr < vma->vm_start) 525 break; 526 527 next = min(vma->vm_end, end); 528 r = svm_migrate_vma_to_vram(adev, prange, vma, addr, next); 529 if (r < 0) { 530 pr_debug("failed %ld to migrate\n", r); 531 break; 532 } else { 533 cpages += r; 534 } 535 addr = next; 536 } 537 538 if (cpages) 539 prange->actual_loc = best_loc; 540 541 return r < 0 ? r : 0; 542 } 543 544 static void svm_migrate_page_free(struct page *page) 545 { 546 struct svm_range_bo *svm_bo = page->zone_device_data; 547 548 if (svm_bo) { 549 pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref)); 550 svm_range_bo_unref_async(svm_bo); 551 } 552 } 553 554 static int 555 svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange, 556 struct migrate_vma *migrate, struct dma_fence **mfence, 557 dma_addr_t *scratch, uint64_t npages) 558 { 559 struct device *dev = adev->dev; 560 uint64_t *src; 561 dma_addr_t *dst; 562 struct page *dpage; 563 uint64_t i = 0, j; 564 uint64_t addr; 565 int r = 0; 566 567 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, 568 prange->last); 569 570 addr = prange->start << PAGE_SHIFT; 571 572 src = (uint64_t *)(scratch + npages); 573 dst = scratch; 574 575 for (i = 0, j = 0; i < npages; i++, addr += PAGE_SIZE) { 576 struct page *spage; 577 578 spage = migrate_pfn_to_page(migrate->src[i]); 579 if (!spage || !is_zone_device_page(spage)) { 580 pr_debug("invalid page. Could be in CPU already svms 0x%p [0x%lx 0x%lx]\n", 581 prange->svms, prange->start, prange->last); 582 if (j) { 583 r = svm_migrate_copy_memory_gart(adev, dst + i - j, 584 src + i - j, j, 585 FROM_VRAM_TO_RAM, 586 mfence); 587 if (r) 588 goto out_oom; 589 j = 0; 590 } 591 continue; 592 } 593 src[i] = svm_migrate_addr(adev, spage); 594 if (i > 0 && src[i] != src[i - 1] + PAGE_SIZE) { 595 r = svm_migrate_copy_memory_gart(adev, dst + i - j, 596 src + i - j, j, 597 FROM_VRAM_TO_RAM, 598 mfence); 599 if (r) 600 goto out_oom; 601 j = 0; 602 } 603 604 dpage = svm_migrate_get_sys_page(migrate->vma, addr); 605 if (!dpage) { 606 pr_debug("failed get page svms 0x%p [0x%lx 0x%lx]\n", 607 prange->svms, prange->start, prange->last); 608 r = -ENOMEM; 609 goto out_oom; 610 } 611 612 dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_FROM_DEVICE); 613 r = dma_mapping_error(dev, dst[i]); 614 if (r) { 615 dev_err(adev->dev, "%s: fail %d dma_map_page\n", __func__, r); 616 goto out_oom; 617 } 618 619 pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n", 620 dst[i] >> PAGE_SHIFT, page_to_pfn(dpage)); 621 622 migrate->dst[i] = migrate_pfn(page_to_pfn(dpage)); 623 j++; 624 } 625 626 r = svm_migrate_copy_memory_gart(adev, dst + i - j, src + i - j, j, 627 FROM_VRAM_TO_RAM, mfence); 628 629 out_oom: 630 if (r) { 631 pr_debug("failed %d copy to ram\n", r); 632 while (i--) { 633 svm_migrate_put_sys_page(dst[i]); 634 migrate->dst[i] = 0; 635 } 636 } 637 638 return r; 639 } 640 641 /** 642 * svm_migrate_vma_to_ram - migrate range inside one vma from device to system 643 * 644 * @adev: amdgpu device to migrate from 645 * @prange: svm range structure 646 * @vma: vm_area_struct that range [start, end] belongs to 647 * @start: range start virtual address in pages 648 * @end: range end virtual address in pages 649 * 650 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex 651 * 652 * Return: 653 * 0 - success with all pages migrated 654 * negative values - indicate error 655 * positive values - partial migration, number of pages not migrated 656 */ 657 static long 658 svm_migrate_vma_to_ram(struct amdgpu_device *adev, struct svm_range *prange, 659 struct vm_area_struct *vma, uint64_t start, uint64_t end) 660 { 661 uint64_t npages = (end - start) >> PAGE_SHIFT; 662 unsigned long upages = npages; 663 unsigned long cpages = 0; 664 struct kfd_process_device *pdd; 665 struct dma_fence *mfence = NULL; 666 struct migrate_vma migrate; 667 dma_addr_t *scratch; 668 size_t size; 669 void *buf; 670 int r = -ENOMEM; 671 672 memset(&migrate, 0, sizeof(migrate)); 673 migrate.vma = vma; 674 migrate.start = start; 675 migrate.end = end; 676 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; 677 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); 678 679 size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t); 680 size *= npages; 681 buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); 682 if (!buf) 683 goto out; 684 685 migrate.src = buf; 686 migrate.dst = migrate.src + npages; 687 scratch = (dma_addr_t *)(migrate.dst + npages); 688 689 r = migrate_vma_setup(&migrate); 690 if (r) { 691 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", 692 __func__, r, prange->start, prange->last); 693 goto out_free; 694 } 695 696 cpages = migrate.cpages; 697 if (!cpages) { 698 pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n", 699 prange->start, prange->last); 700 upages = svm_migrate_unsuccessful_pages(&migrate); 701 goto out_free; 702 } 703 if (cpages != npages) 704 pr_debug("partial migration, 0x%lx/0x%llx pages migrated\n", 705 cpages, npages); 706 else 707 pr_debug("0x%lx pages migrated\n", cpages); 708 709 r = svm_migrate_copy_to_ram(adev, prange, &migrate, &mfence, 710 scratch, npages); 711 migrate_vma_pages(&migrate); 712 713 upages = svm_migrate_unsuccessful_pages(&migrate); 714 pr_debug("unsuccessful/cpages/npages 0x%lx/0x%lx/0x%lx\n", 715 upages, cpages, migrate.npages); 716 717 svm_migrate_copy_done(adev, mfence); 718 migrate_vma_finalize(&migrate); 719 svm_range_dma_unmap(adev->dev, scratch, 0, npages); 720 721 out_free: 722 kvfree(buf); 723 out: 724 if (!r && cpages) { 725 pdd = svm_range_get_pdd_by_adev(prange, adev); 726 if (pdd) 727 WRITE_ONCE(pdd->page_out, pdd->page_out + cpages); 728 } 729 return r ? r : upages; 730 } 731 732 /** 733 * svm_migrate_vram_to_ram - migrate svm range from device to system 734 * @prange: range structure 735 * @mm: process mm, use current->mm if NULL 736 * 737 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex 738 * 739 * Return: 740 * 0 - OK, otherwise error code 741 */ 742 int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm) 743 { 744 struct amdgpu_device *adev; 745 struct vm_area_struct *vma; 746 unsigned long addr; 747 unsigned long start; 748 unsigned long end; 749 unsigned long upages = 0; 750 long r = 0; 751 752 if (!prange->actual_loc) { 753 pr_debug("[0x%lx 0x%lx] already migrated to ram\n", 754 prange->start, prange->last); 755 return 0; 756 } 757 758 adev = svm_range_get_adev_by_id(prange, prange->actual_loc); 759 if (!adev) { 760 pr_debug("failed to get device by id 0x%x\n", 761 prange->actual_loc); 762 return -ENODEV; 763 } 764 765 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] from gpu 0x%x to ram\n", 766 prange->svms, prange, prange->start, prange->last, 767 prange->actual_loc); 768 769 start = prange->start << PAGE_SHIFT; 770 end = (prange->last + 1) << PAGE_SHIFT; 771 772 for (addr = start; addr < end;) { 773 unsigned long next; 774 775 vma = find_vma(mm, addr); 776 if (!vma || addr < vma->vm_start) { 777 pr_debug("failed to find vma for prange %p\n", prange); 778 r = -EFAULT; 779 break; 780 } 781 782 next = min(vma->vm_end, end); 783 r = svm_migrate_vma_to_ram(adev, prange, vma, addr, next); 784 if (r < 0) { 785 pr_debug("failed %ld to migrate prange %p\n", r, prange); 786 break; 787 } else { 788 upages += r; 789 } 790 addr = next; 791 } 792 793 if (r >= 0 && !upages) { 794 svm_range_vram_node_free(prange); 795 prange->actual_loc = 0; 796 } 797 798 return r < 0 ? r : 0; 799 } 800 801 /** 802 * svm_migrate_vram_to_vram - migrate svm range from device to device 803 * @prange: range structure 804 * @best_loc: the device to migrate to 805 * @mm: process mm, use current->mm if NULL 806 * 807 * Context: Process context, caller hold mmap read lock, svms lock, prange lock 808 * 809 * Return: 810 * 0 - OK, otherwise error code 811 */ 812 static int 813 svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc, 814 struct mm_struct *mm) 815 { 816 int r, retries = 3; 817 818 /* 819 * TODO: for both devices with PCIe large bar or on same xgmi hive, skip 820 * system memory as migration bridge 821 */ 822 823 pr_debug("from gpu 0x%x to gpu 0x%x\n", prange->actual_loc, best_loc); 824 825 do { 826 r = svm_migrate_vram_to_ram(prange, mm); 827 if (r) 828 return r; 829 } while (prange->actual_loc && --retries); 830 831 if (prange->actual_loc) 832 return -EDEADLK; 833 834 return svm_migrate_ram_to_vram(prange, best_loc, mm); 835 } 836 837 int 838 svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc, 839 struct mm_struct *mm) 840 { 841 if (!prange->actual_loc) 842 return svm_migrate_ram_to_vram(prange, best_loc, mm); 843 else 844 return svm_migrate_vram_to_vram(prange, best_loc, mm); 845 846 } 847 848 /** 849 * svm_migrate_to_ram - CPU page fault handler 850 * @vmf: CPU vm fault vma, address 851 * 852 * Context: vm fault handler, caller holds the mmap read lock 853 * 854 * Return: 855 * 0 - OK 856 * VM_FAULT_SIGBUS - notice application to have SIGBUS page fault 857 */ 858 static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf) 859 { 860 unsigned long addr = vmf->address; 861 struct vm_area_struct *vma; 862 enum svm_work_list_ops op; 863 struct svm_range *parent; 864 struct svm_range *prange; 865 struct kfd_process *p; 866 struct mm_struct *mm; 867 int r = 0; 868 869 vma = vmf->vma; 870 mm = vma->vm_mm; 871 872 p = kfd_lookup_process_by_mm(vma->vm_mm); 873 if (!p) { 874 pr_debug("failed find process at fault address 0x%lx\n", addr); 875 return VM_FAULT_SIGBUS; 876 } 877 if (READ_ONCE(p->svms.faulting_task) == current) { 878 pr_debug("skipping ram migration\n"); 879 kfd_unref_process(p); 880 return 0; 881 } 882 addr >>= PAGE_SHIFT; 883 pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr); 884 885 mutex_lock(&p->svms.lock); 886 887 prange = svm_range_from_addr(&p->svms, addr, &parent); 888 if (!prange) { 889 pr_debug("cannot find svm range at 0x%lx\n", addr); 890 r = -EFAULT; 891 goto out; 892 } 893 894 mutex_lock(&parent->migrate_mutex); 895 if (prange != parent) 896 mutex_lock_nested(&prange->migrate_mutex, 1); 897 898 if (!prange->actual_loc) 899 goto out_unlock_prange; 900 901 svm_range_lock(parent); 902 if (prange != parent) 903 mutex_lock_nested(&prange->lock, 1); 904 r = svm_range_split_by_granularity(p, mm, addr, parent, prange); 905 if (prange != parent) 906 mutex_unlock(&prange->lock); 907 svm_range_unlock(parent); 908 if (r) { 909 pr_debug("failed %d to split range by granularity\n", r); 910 goto out_unlock_prange; 911 } 912 913 r = svm_migrate_vram_to_ram(prange, mm); 914 if (r) 915 pr_debug("failed %d migrate 0x%p [0x%lx 0x%lx] to ram\n", r, 916 prange, prange->start, prange->last); 917 918 /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ 919 if (p->xnack_enabled && parent == prange) 920 op = SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP; 921 else 922 op = SVM_OP_UPDATE_RANGE_NOTIFIER; 923 svm_range_add_list_work(&p->svms, parent, mm, op); 924 schedule_deferred_list_work(&p->svms); 925 926 out_unlock_prange: 927 if (prange != parent) 928 mutex_unlock(&prange->migrate_mutex); 929 mutex_unlock(&parent->migrate_mutex); 930 out: 931 mutex_unlock(&p->svms.lock); 932 kfd_unref_process(p); 933 934 pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); 935 936 return r ? VM_FAULT_SIGBUS : 0; 937 } 938 939 static const struct dev_pagemap_ops svm_migrate_pgmap_ops = { 940 .page_free = svm_migrate_page_free, 941 .migrate_to_ram = svm_migrate_to_ram, 942 }; 943 944 /* Each VRAM page uses sizeof(struct page) on system memory */ 945 #define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page)) 946 947 int svm_migrate_init(struct amdgpu_device *adev) 948 { 949 struct kfd_dev *kfddev = adev->kfd.dev; 950 struct dev_pagemap *pgmap; 951 struct resource *res; 952 unsigned long size; 953 void *r; 954 955 /* Page migration works on Vega10 or newer */ 956 if (!KFD_IS_SOC15(kfddev)) 957 return -EINVAL; 958 959 pgmap = &kfddev->pgmap; 960 memset(pgmap, 0, sizeof(*pgmap)); 961 962 /* TODO: register all vram to HMM for now. 963 * should remove reserved size 964 */ 965 size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20); 966 res = devm_request_free_mem_region(adev->dev, &iomem_resource, size); 967 if (IS_ERR(res)) 968 return -ENOMEM; 969 970 pgmap->type = MEMORY_DEVICE_PRIVATE; 971 pgmap->nr_range = 1; 972 pgmap->range.start = res->start; 973 pgmap->range.end = res->end; 974 pgmap->ops = &svm_migrate_pgmap_ops; 975 pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev); 976 pgmap->flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; 977 978 /* Device manager releases device-specific resources, memory region and 979 * pgmap when driver disconnects from device. 980 */ 981 r = devm_memremap_pages(adev->dev, pgmap); 982 if (IS_ERR(r)) { 983 pr_err("failed to register HMM device memory\n"); 984 985 /* Disable SVM support capability */ 986 pgmap->type = 0; 987 devm_release_mem_region(adev->dev, res->start, resource_size(res)); 988 return PTR_ERR(r); 989 } 990 991 pr_debug("reserve %ldMB system memory for VRAM pages struct\n", 992 SVM_HMM_PAGE_STRUCT_SIZE(size) >> 20); 993 994 amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size)); 995 996 pr_info("HMM registered %ldMB device memory\n", size >> 20); 997 998 return 0; 999 } 1000