1075 lines · c
1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*3 * Copyright 2020-2021 Advanced Micro Devices, Inc.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software"),7 * to deal in the Software without restriction, including without limitation8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,9 * and/or sell copies of the Software, and to permit persons to whom the10 * Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice shall be included in13 * all copies or substantial portions of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR19 * 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 OR21 * 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_fmt38#undef dev_fmt39#endif40#define dev_fmt(fmt) "kfd_migrate: " fmt41 42static uint64_t43svm_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 int49svm_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, 0);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 vram102 *103 * @adev: amdgpu device the sdma ring running104 * @sys: system DMA pointer to be copied105 * @vram: vram destination DMA pointer106 * @npages: number of pages to copy107 * @direction: enum MIGRATION_COPY_DIR108 * @mfence: output, sdma fence to signal after sdma is done109 *110 * ram address uses GART table continuous entries mapping to ram pages,111 * vram address uses direct mapping of vram pages, which must have npages112 * number of continuous pages.113 * GART update and sdma uses same buf copy function ring, sdma is splited to114 * multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, wait for115 * the last sdma finish fence which is returned to check copy memory is done.116 *117 * Context: Process context, takes and releases gtt_window_lock118 *119 * Return:120 * 0 - OK, otherwise error code121 */122 123static int124svm_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, 0);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 done179 *180 * @adev: amdgpu device the sdma memory copy is executing on181 * @mfence: migrate fence182 *183 * Wait for dma fence is signaled, if the copy ssplit into multiple sdma184 * operations, this is the last sdma operation fence.185 *186 * Context: called after svm_migrate_copy_memory187 *188 * Return:189 * 0 - success190 * otherwise - error code from dma fence signal191 */192static int193svm_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 long207svm_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 void213svm_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 void224svm_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 long234svm_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_unsuccessful_pages(struct migrate_vma *migrate)264{265 unsigned long upages = 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 upages++;272 }273 return upages;274}275 276static int277svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,278 struct migrate_vma *migrate, struct dma_fence **mfence,279 dma_addr_t *scratch, uint64_t ttm_res_offset)280{281 uint64_t npages = migrate->cpages;282 struct amdgpu_device *adev = node->adev;283 struct device *dev = adev->dev;284 struct amdgpu_res_cursor cursor;285 dma_addr_t *src;286 uint64_t *dst;287 uint64_t i, j;288 int r;289 290 pr_debug("svms 0x%p [0x%lx 0x%lx 0x%llx]\n", prange->svms, prange->start,291 prange->last, ttm_res_offset);292 293 src = scratch;294 dst = (uint64_t *)(scratch + npages);295 296 amdgpu_res_first(prange->ttm_res, ttm_res_offset,297 npages << PAGE_SHIFT, &cursor);298 for (i = j = 0; i < npages; i++) {299 struct page *spage;300 301 dst[i] = cursor.start + (j << PAGE_SHIFT);302 migrate->dst[i] = svm_migrate_addr_to_pfn(adev, dst[i]);303 svm_migrate_get_vram_page(prange, migrate->dst[i]);304 migrate->dst[i] = migrate_pfn(migrate->dst[i]);305 306 spage = migrate_pfn_to_page(migrate->src[i]);307 if (spage && !is_zone_device_page(spage)) {308 src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE,309 DMA_TO_DEVICE);310 r = dma_mapping_error(dev, src[i]);311 if (r) {312 dev_err(dev, "%s: fail %d dma_map_page\n",313 __func__, r);314 goto out_free_vram_pages;315 }316 } else {317 if (j) {318 r = svm_migrate_copy_memory_gart(319 adev, src + i - j,320 dst + i - j, j,321 FROM_RAM_TO_VRAM,322 mfence);323 if (r)324 goto out_free_vram_pages;325 amdgpu_res_next(&cursor, (j + 1) << PAGE_SHIFT);326 j = 0;327 } else {328 amdgpu_res_next(&cursor, PAGE_SIZE);329 }330 continue;331 }332 333 pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n",334 src[i] >> PAGE_SHIFT, page_to_pfn(spage));335 336 if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) {337 r = svm_migrate_copy_memory_gart(adev, src + i - j,338 dst + i - j, j + 1,339 FROM_RAM_TO_VRAM,340 mfence);341 if (r)342 goto out_free_vram_pages;343 amdgpu_res_next(&cursor, (j + 1) * PAGE_SIZE);344 j = 0;345 } else {346 j++;347 }348 }349 350 r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j,351 FROM_RAM_TO_VRAM, mfence);352 353out_free_vram_pages:354 if (r) {355 pr_debug("failed %d to copy memory to vram\n", r);356 while (i--) {357 svm_migrate_put_vram_page(adev, dst[i]);358 migrate->dst[i] = 0;359 }360 }361 362#ifdef DEBUG_FORCE_MIXED_DOMAINS363 for (i = 0, j = 0; i < npages; i += 4, j++) {364 if (j & 1)365 continue;366 svm_migrate_put_vram_page(adev, dst[i]);367 migrate->dst[i] = 0;368 svm_migrate_put_vram_page(adev, dst[i + 1]);369 migrate->dst[i + 1] = 0;370 svm_migrate_put_vram_page(adev, dst[i + 2]);371 migrate->dst[i + 2] = 0;372 svm_migrate_put_vram_page(adev, dst[i + 3]);373 migrate->dst[i + 3] = 0;374 }375#endif376 377 return r;378}379 380static long381svm_migrate_vma_to_vram(struct kfd_node *node, struct svm_range *prange,382 struct vm_area_struct *vma, uint64_t start,383 uint64_t end, uint32_t trigger, uint64_t ttm_res_offset)384{385 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms);386 uint64_t npages = (end - start) >> PAGE_SHIFT;387 struct amdgpu_device *adev = node->adev;388 struct kfd_process_device *pdd;389 struct dma_fence *mfence = NULL;390 struct migrate_vma migrate = { 0 };391 unsigned long cpages = 0;392 unsigned long mpages = 0;393 dma_addr_t *scratch;394 void *buf;395 int r = -ENOMEM;396 397 memset(&migrate, 0, sizeof(migrate));398 migrate.vma = vma;399 migrate.start = start;400 migrate.end = end;401 migrate.flags = MIGRATE_VMA_SELECT_SYSTEM;402 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);403 404 buf = kvcalloc(npages,405 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t),406 GFP_KERNEL);407 if (!buf)408 goto out;409 410 migrate.src = buf;411 migrate.dst = migrate.src + npages;412 scratch = (dma_addr_t *)(migrate.dst + npages);413 414 kfd_smi_event_migration_start(node, p->lead_thread->pid,415 start >> PAGE_SHIFT, end >> PAGE_SHIFT,416 0, node->id, prange->prefetch_loc,417 prange->preferred_loc, trigger);418 419 r = migrate_vma_setup(&migrate);420 if (r) {421 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n",422 __func__, r, prange->start, prange->last);423 goto out_free;424 }425 426 cpages = migrate.cpages;427 if (!cpages) {428 pr_debug("failed collect migrate sys pages [0x%lx 0x%lx]\n",429 prange->start, prange->last);430 goto out_free;431 }432 if (cpages != npages)433 pr_debug("partial migration, 0x%lx/0x%llx pages collected\n",434 cpages, npages);435 else436 pr_debug("0x%lx pages collected\n", cpages);437 438 r = svm_migrate_copy_to_vram(node, prange, &migrate, &mfence, scratch, ttm_res_offset);439 migrate_vma_pages(&migrate);440 441 svm_migrate_copy_done(adev, mfence);442 migrate_vma_finalize(&migrate);443 444 mpages = cpages - svm_migrate_unsuccessful_pages(&migrate);445 pr_debug("successful/cpages/npages 0x%lx/0x%lx/0x%lx\n",446 mpages, cpages, migrate.npages);447 448 kfd_smi_event_migration_end(node, p->lead_thread->pid,449 start >> PAGE_SHIFT, end >> PAGE_SHIFT,450 0, node->id, trigger);451 452 svm_range_dma_unmap_dev(adev->dev, scratch, 0, npages);453 454out_free:455 kvfree(buf);456out:457 if (!r && mpages) {458 pdd = svm_range_get_pdd_by_node(prange, node);459 if (pdd)460 WRITE_ONCE(pdd->page_in, pdd->page_in + mpages);461 462 return mpages;463 }464 return r;465}466 467/**468 * svm_migrate_ram_to_vram - migrate svm range from system to device469 * @prange: range structure470 * @best_loc: the device to migrate to471 * @start_mgr: start page to migrate472 * @last_mgr: last page to migrate473 * @mm: the process mm structure474 * @trigger: reason of migration475 *476 * Context: Process context, caller hold mmap read lock, svms lock, prange lock477 *478 * Return:479 * 0 - OK, otherwise error code480 */481static int482svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc,483 unsigned long start_mgr, unsigned long last_mgr,484 struct mm_struct *mm, uint32_t trigger)485{486 unsigned long addr, start, end;487 struct vm_area_struct *vma;488 uint64_t ttm_res_offset;489 struct kfd_node *node;490 unsigned long mpages = 0;491 long r = 0;492 493 if (start_mgr < prange->start || last_mgr > prange->last) {494 pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n",495 start_mgr, last_mgr, prange->start, prange->last);496 return -EFAULT;497 }498 499 node = svm_range_get_node_by_id(prange, best_loc);500 if (!node) {501 pr_debug("failed to get kfd node by id 0x%x\n", best_loc);502 return -ENODEV;503 }504 505 pr_debug("svms 0x%p [0x%lx 0x%lx] in [0x%lx 0x%lx] to gpu 0x%x\n",506 prange->svms, start_mgr, last_mgr, prange->start, prange->last,507 best_loc);508 509 start = start_mgr << PAGE_SHIFT;510 end = (last_mgr + 1) << PAGE_SHIFT;511 512 r = amdgpu_amdkfd_reserve_mem_limit(node->adev,513 prange->npages * PAGE_SIZE,514 KFD_IOC_ALLOC_MEM_FLAGS_VRAM,515 node->xcp ? node->xcp->id : 0);516 if (r) {517 dev_dbg(node->adev->dev, "failed to reserve VRAM, r: %ld\n", r);518 return -ENOSPC;519 }520 521 r = svm_range_vram_node_new(node, prange, true);522 if (r) {523 dev_dbg(node->adev->dev, "fail %ld to alloc vram\n", r);524 goto out;525 }526 ttm_res_offset = (start_mgr - prange->start + prange->offset) << PAGE_SHIFT;527 528 for (addr = start; addr < end;) {529 unsigned long next;530 531 vma = vma_lookup(mm, addr);532 if (!vma)533 break;534 535 next = min(vma->vm_end, end);536 r = svm_migrate_vma_to_vram(node, prange, vma, addr, next, trigger, ttm_res_offset);537 if (r < 0) {538 pr_debug("failed %ld to migrate\n", r);539 break;540 } else {541 mpages += r;542 }543 ttm_res_offset += next - addr;544 addr = next;545 }546 547 if (mpages) {548 prange->actual_loc = best_loc;549 prange->vram_pages += mpages;550 } else if (!prange->actual_loc) {551 /* if no page migrated and all pages from prange are at552 * sys ram drop svm_bo got from svm_range_vram_node_new553 */554 svm_range_vram_node_free(prange);555 }556 557out:558 amdgpu_amdkfd_unreserve_mem_limit(node->adev,559 prange->npages * PAGE_SIZE,560 KFD_IOC_ALLOC_MEM_FLAGS_VRAM,561 node->xcp ? node->xcp->id : 0);562 return r < 0 ? r : 0;563}564 565static void svm_migrate_page_free(struct page *page)566{567 struct svm_range_bo *svm_bo = page->zone_device_data;568 569 if (svm_bo) {570 pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref));571 svm_range_bo_unref_async(svm_bo);572 }573}574 575static int576svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange,577 struct migrate_vma *migrate, struct dma_fence **mfence,578 dma_addr_t *scratch, uint64_t npages)579{580 struct device *dev = adev->dev;581 uint64_t *src;582 dma_addr_t *dst;583 struct page *dpage;584 uint64_t i = 0, j;585 uint64_t addr;586 int r = 0;587 588 pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start,589 prange->last);590 591 addr = migrate->start;592 593 src = (uint64_t *)(scratch + npages);594 dst = scratch;595 596 for (i = 0, j = 0; i < npages; i++, addr += PAGE_SIZE) {597 struct page *spage;598 599 spage = migrate_pfn_to_page(migrate->src[i]);600 if (!spage || !is_zone_device_page(spage)) {601 pr_debug("invalid page. Could be in CPU already svms 0x%p [0x%lx 0x%lx]\n",602 prange->svms, prange->start, prange->last);603 if (j) {604 r = svm_migrate_copy_memory_gart(adev, dst + i - j,605 src + i - j, j,606 FROM_VRAM_TO_RAM,607 mfence);608 if (r)609 goto out_oom;610 j = 0;611 }612 continue;613 }614 src[i] = svm_migrate_addr(adev, spage);615 if (j > 0 && src[i] != src[i - 1] + PAGE_SIZE) {616 r = svm_migrate_copy_memory_gart(adev, dst + i - j,617 src + i - j, j,618 FROM_VRAM_TO_RAM,619 mfence);620 if (r)621 goto out_oom;622 j = 0;623 }624 625 dpage = svm_migrate_get_sys_page(migrate->vma, addr);626 if (!dpage) {627 pr_debug("failed get page svms 0x%p [0x%lx 0x%lx]\n",628 prange->svms, prange->start, prange->last);629 r = -ENOMEM;630 goto out_oom;631 }632 633 dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_FROM_DEVICE);634 r = dma_mapping_error(dev, dst[i]);635 if (r) {636 dev_err(adev->dev, "%s: fail %d dma_map_page\n", __func__, r);637 goto out_oom;638 }639 640 pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n",641 dst[i] >> PAGE_SHIFT, page_to_pfn(dpage));642 643 migrate->dst[i] = migrate_pfn(page_to_pfn(dpage));644 j++;645 }646 647 r = svm_migrate_copy_memory_gart(adev, dst + i - j, src + i - j, j,648 FROM_VRAM_TO_RAM, mfence);649 650out_oom:651 if (r) {652 pr_debug("failed %d copy to ram\n", r);653 while (i--) {654 svm_migrate_put_sys_page(dst[i]);655 migrate->dst[i] = 0;656 }657 }658 659 return r;660}661 662/**663 * svm_migrate_vma_to_ram - migrate range inside one vma from device to system664 *665 * @prange: svm range structure666 * @vma: vm_area_struct that range [start, end] belongs to667 * @start: range start virtual address in pages668 * @end: range end virtual address in pages669 * @node: kfd node device to migrate from670 * @trigger: reason of migration671 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback672 *673 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex674 *675 * Return:676 * negative values - indicate error677 * positive values or zero - number of pages got migrated678 */679static long680svm_migrate_vma_to_ram(struct kfd_node *node, struct svm_range *prange,681 struct vm_area_struct *vma, uint64_t start, uint64_t end,682 uint32_t trigger, struct page *fault_page)683{684 struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms);685 uint64_t npages = (end - start) >> PAGE_SHIFT;686 unsigned long upages = npages;687 unsigned long cpages = 0;688 unsigned long mpages = 0;689 struct amdgpu_device *adev = node->adev;690 struct kfd_process_device *pdd;691 struct dma_fence *mfence = NULL;692 struct migrate_vma migrate = { 0 };693 dma_addr_t *scratch;694 void *buf;695 int r = -ENOMEM;696 697 memset(&migrate, 0, sizeof(migrate));698 migrate.vma = vma;699 migrate.start = start;700 migrate.end = end;701 migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev);702 if (adev->gmc.xgmi.connected_to_cpu)703 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_COHERENT;704 else705 migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE;706 707 buf = kvcalloc(npages,708 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t),709 GFP_KERNEL);710 if (!buf)711 goto out;712 713 migrate.src = buf;714 migrate.dst = migrate.src + npages;715 migrate.fault_page = fault_page;716 scratch = (dma_addr_t *)(migrate.dst + npages);717 718 kfd_smi_event_migration_start(node, p->lead_thread->pid,719 start >> PAGE_SHIFT, end >> PAGE_SHIFT,720 node->id, 0, prange->prefetch_loc,721 prange->preferred_loc, trigger);722 723 r = migrate_vma_setup(&migrate);724 if (r) {725 dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n",726 __func__, r, prange->start, prange->last);727 goto out_free;728 }729 730 cpages = migrate.cpages;731 if (!cpages) {732 pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n",733 prange->start, prange->last);734 upages = svm_migrate_unsuccessful_pages(&migrate);735 goto out_free;736 }737 if (cpages != npages)738 pr_debug("partial migration, 0x%lx/0x%llx pages collected\n",739 cpages, npages);740 else741 pr_debug("0x%lx pages collected\n", cpages);742 743 r = svm_migrate_copy_to_ram(adev, prange, &migrate, &mfence,744 scratch, npages);745 migrate_vma_pages(&migrate);746 747 upages = svm_migrate_unsuccessful_pages(&migrate);748 pr_debug("unsuccessful/cpages/npages 0x%lx/0x%lx/0x%lx\n",749 upages, cpages, migrate.npages);750 751 svm_migrate_copy_done(adev, mfence);752 migrate_vma_finalize(&migrate);753 754 kfd_smi_event_migration_end(node, p->lead_thread->pid,755 start >> PAGE_SHIFT, end >> PAGE_SHIFT,756 node->id, 0, trigger);757 758 svm_range_dma_unmap_dev(adev->dev, scratch, 0, npages);759 760out_free:761 kvfree(buf);762out:763 if (!r && cpages) {764 mpages = cpages - upages;765 pdd = svm_range_get_pdd_by_node(prange, node);766 if (pdd)767 WRITE_ONCE(pdd->page_out, pdd->page_out + mpages);768 }769 770 return r ? r : mpages;771}772 773/**774 * svm_migrate_vram_to_ram - migrate svm range from device to system775 * @prange: range structure776 * @mm: process mm, use current->mm if NULL777 * @start_mgr: start page need be migrated to sys ram778 * @last_mgr: last page need be migrated to sys ram779 * @trigger: reason of migration780 * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback781 *782 * Context: Process context, caller hold mmap read lock, prange->migrate_mutex783 *784 * Return:785 * 0 - OK, otherwise error code786 */787int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm,788 unsigned long start_mgr, unsigned long last_mgr,789 uint32_t trigger, struct page *fault_page)790{791 struct kfd_node *node;792 struct vm_area_struct *vma;793 unsigned long addr;794 unsigned long start;795 unsigned long end;796 unsigned long mpages = 0;797 long r = 0;798 799 /* this pragne has no any vram page to migrate to sys ram */800 if (!prange->actual_loc) {801 pr_debug("[0x%lx 0x%lx] already migrated to ram\n",802 prange->start, prange->last);803 return 0;804 }805 806 if (start_mgr < prange->start || last_mgr > prange->last) {807 pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n",808 start_mgr, last_mgr, prange->start, prange->last);809 return -EFAULT;810 }811 812 node = svm_range_get_node_by_id(prange, prange->actual_loc);813 if (!node) {814 pr_debug("failed to get kfd node by id 0x%x\n", prange->actual_loc);815 return -ENODEV;816 }817 pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] from gpu 0x%x to ram\n",818 prange->svms, prange, start_mgr, last_mgr,819 prange->actual_loc);820 821 start = start_mgr << PAGE_SHIFT;822 end = (last_mgr + 1) << PAGE_SHIFT;823 824 for (addr = start; addr < end;) {825 unsigned long next;826 827 vma = vma_lookup(mm, addr);828 if (!vma) {829 pr_debug("failed to find vma for prange %p\n", prange);830 r = -EFAULT;831 break;832 }833 834 next = min(vma->vm_end, end);835 r = svm_migrate_vma_to_ram(node, prange, vma, addr, next, trigger,836 fault_page);837 if (r < 0) {838 pr_debug("failed %ld to migrate prange %p\n", r, prange);839 break;840 } else {841 mpages += r;842 }843 addr = next;844 }845 846 if (r >= 0) {847 prange->vram_pages -= mpages;848 849 /* prange does not have vram page set its actual_loc to system850 * and drop its svm_bo ref851 */852 if (prange->vram_pages == 0 && prange->ttm_res) {853 prange->actual_loc = 0;854 svm_range_vram_node_free(prange);855 }856 }857 858 return r < 0 ? r : 0;859}860 861/**862 * svm_migrate_vram_to_vram - migrate svm range from device to device863 * @prange: range structure864 * @best_loc: the device to migrate to865 * @start: start page need be migrated to sys ram866 * @last: last page need be migrated to sys ram867 * @mm: process mm, use current->mm if NULL868 * @trigger: reason of migration869 *870 * Context: Process context, caller hold mmap read lock, svms lock, prange lock871 *872 * migrate all vram pages in prange to sys ram, then migrate873 * [start, last] pages from sys ram to gpu node best_loc.874 *875 * Return:876 * 0 - OK, otherwise error code877 */878static int879svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc,880 unsigned long start, unsigned long last,881 struct mm_struct *mm, uint32_t trigger)882{883 int r, retries = 3;884 885 /*886 * TODO: for both devices with PCIe large bar or on same xgmi hive, skip887 * system memory as migration bridge888 */889 890 pr_debug("from gpu 0x%x to gpu 0x%x\n", prange->actual_loc, best_loc);891 892 do {893 r = svm_migrate_vram_to_ram(prange, mm, prange->start, prange->last,894 trigger, NULL);895 if (r)896 return r;897 } while (prange->actual_loc && --retries);898 899 if (prange->actual_loc)900 return -EDEADLK;901 902 return svm_migrate_ram_to_vram(prange, best_loc, start, last, mm, trigger);903}904 905int906svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc,907 unsigned long start, unsigned long last,908 struct mm_struct *mm, uint32_t trigger)909{910 if (!prange->actual_loc || prange->actual_loc == best_loc)911 return svm_migrate_ram_to_vram(prange, best_loc, start, last,912 mm, trigger);913 914 else915 return svm_migrate_vram_to_vram(prange, best_loc, start, last,916 mm, trigger);917 918}919 920/**921 * svm_migrate_to_ram - CPU page fault handler922 * @vmf: CPU vm fault vma, address923 *924 * Context: vm fault handler, caller holds the mmap read lock925 *926 * Return:927 * 0 - OK928 * VM_FAULT_SIGBUS - notice application to have SIGBUS page fault929 */930static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)931{932 unsigned long start, last, size;933 unsigned long addr = vmf->address;934 struct svm_range_bo *svm_bo;935 struct svm_range *prange;936 struct kfd_process *p;937 struct mm_struct *mm;938 int r = 0;939 940 svm_bo = vmf->page->zone_device_data;941 if (!svm_bo) {942 pr_debug("failed get device page at addr 0x%lx\n", addr);943 return VM_FAULT_SIGBUS;944 }945 if (!mmget_not_zero(svm_bo->eviction_fence->mm)) {946 pr_debug("addr 0x%lx of process mm is destroyed\n", addr);947 return VM_FAULT_SIGBUS;948 }949 950 mm = svm_bo->eviction_fence->mm;951 if (mm != vmf->vma->vm_mm)952 pr_debug("addr 0x%lx is COW mapping in child process\n", addr);953 954 p = kfd_lookup_process_by_mm(mm);955 if (!p) {956 pr_debug("failed find process at fault address 0x%lx\n", addr);957 r = VM_FAULT_SIGBUS;958 goto out_mmput;959 }960 if (READ_ONCE(p->svms.faulting_task) == current) {961 pr_debug("skipping ram migration\n");962 r = 0;963 goto out_unref_process;964 }965 966 pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr);967 addr >>= PAGE_SHIFT;968 969 mutex_lock(&p->svms.lock);970 971 prange = svm_range_from_addr(&p->svms, addr, NULL);972 if (!prange) {973 pr_debug("failed get range svms 0x%p addr 0x%lx\n", &p->svms, addr);974 r = -EFAULT;975 goto out_unlock_svms;976 }977 978 mutex_lock(&prange->migrate_mutex);979 980 if (!prange->actual_loc)981 goto out_unlock_prange;982 983 /* Align migration range start and size to granularity size */984 size = 1UL << prange->granularity;985 start = max(ALIGN_DOWN(addr, size), prange->start);986 last = min(ALIGN(addr + 1, size) - 1, prange->last);987 988 r = svm_migrate_vram_to_ram(prange, vmf->vma->vm_mm, start, last,989 KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU, vmf->page);990 if (r)991 pr_debug("failed %d migrate svms 0x%p range 0x%p [0x%lx 0x%lx]\n",992 r, prange->svms, prange, start, last);993 994out_unlock_prange:995 mutex_unlock(&prange->migrate_mutex);996out_unlock_svms:997 mutex_unlock(&p->svms.lock);998out_unref_process:999 pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr);1000 kfd_unref_process(p);1001out_mmput:1002 mmput(mm);1003 return r ? VM_FAULT_SIGBUS : 0;1004}1005 1006static const struct dev_pagemap_ops svm_migrate_pgmap_ops = {1007 .page_free = svm_migrate_page_free,1008 .migrate_to_ram = svm_migrate_to_ram,1009};1010 1011/* Each VRAM page uses sizeof(struct page) on system memory */1012#define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page))1013 1014int kgd2kfd_init_zone_device(struct amdgpu_device *adev)1015{1016 struct amdgpu_kfd_dev *kfddev = &adev->kfd;1017 struct dev_pagemap *pgmap;1018 struct resource *res = NULL;1019 unsigned long size;1020 void *r;1021 1022 /* Page migration works on gfx9 or newer */1023 if (amdgpu_ip_version(adev, GC_HWIP, 0) < IP_VERSION(9, 0, 1))1024 return -EINVAL;1025 1026 if (adev->flags & AMD_IS_APU)1027 return 0;1028 1029 pgmap = &kfddev->pgmap;1030 memset(pgmap, 0, sizeof(*pgmap));1031 1032 /* TODO: register all vram to HMM for now.1033 * should remove reserved size1034 */1035 size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20);1036 if (adev->gmc.xgmi.connected_to_cpu) {1037 pgmap->range.start = adev->gmc.aper_base;1038 pgmap->range.end = adev->gmc.aper_base + adev->gmc.aper_size - 1;1039 pgmap->type = MEMORY_DEVICE_COHERENT;1040 } else {1041 res = devm_request_free_mem_region(adev->dev, &iomem_resource, size);1042 if (IS_ERR(res))1043 return PTR_ERR(res);1044 pgmap->range.start = res->start;1045 pgmap->range.end = res->end;1046 pgmap->type = MEMORY_DEVICE_PRIVATE;1047 }1048 1049 pgmap->nr_range = 1;1050 pgmap->ops = &svm_migrate_pgmap_ops;1051 pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev);1052 pgmap->flags = 0;1053 /* Device manager releases device-specific resources, memory region and1054 * pgmap when driver disconnects from device.1055 */1056 r = devm_memremap_pages(adev->dev, pgmap);1057 if (IS_ERR(r)) {1058 pr_err("failed to register HMM device memory\n");1059 if (pgmap->type == MEMORY_DEVICE_PRIVATE)1060 devm_release_mem_region(adev->dev, res->start, resource_size(res));1061 /* Disable SVM support capability */1062 pgmap->type = 0;1063 return PTR_ERR(r);1064 }1065 1066 pr_debug("reserve %ldMB system memory for VRAM pages struct\n",1067 SVM_HMM_PAGE_STRUCT_SIZE(size) >> 20);1068 1069 amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size));1070 1071 pr_info("HMM registered %ldMB device memory\n", size >> 20);1072 1073 return 0;1074}1075