diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_migrate.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 1079 |
1 files changed, 1079 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c new file mode 100644 index 000000000000..af53e796ea1b --- /dev/null +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -0,0 +1,1079 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright 2020-2021 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ +#include <linux/types.h> +#include <linux/dma-direction.h> +#include <linux/dma-mapping.h> +#include <linux/migrate.h> +#include "amdgpu_sync.h" +#include "amdgpu_object.h" +#include "amdgpu_vm.h" +#include "amdgpu_res_cursor.h" +#include "kfd_priv.h" +#include "kfd_svm.h" +#include "kfd_migrate.h" +#include "kfd_smi_events.h" + +#ifdef dev_fmt +#undef dev_fmt +#endif +#define dev_fmt(fmt) "kfd_migrate: " fmt + +static u64 +svm_migrate_direct_mapping_addr(struct amdgpu_device *adev, u64 addr) +{ + return addr + amdgpu_ttm_domain_start(adev, TTM_PL_VRAM); +} + +static int +svm_migrate_gart_map(struct amdgpu_ring *ring, u64 npages, + dma_addr_t *addr, u64 *gart_addr, u64 flags) +{ + struct amdgpu_device *adev = ring->adev; + struct amdgpu_job *job; + unsigned int num_dw, num_bytes; + struct dma_fence *fence; + u64 src_addr, dst_addr; + u64 pte_flags; + void *cpu_addr; + int r; + + /* use gart window 0 */ + *gart_addr = adev->gmc.gart_start; + + num_dw = ALIGN(adev->mman.buffer_funcs->copy_num_dw, 8); + num_bytes = npages * 8; + + r = amdgpu_job_alloc_with_ib(adev, &adev->mman.high_pr, + AMDGPU_FENCE_OWNER_UNDEFINED, + num_dw * 4 + num_bytes, + AMDGPU_IB_POOL_DELAYED, + &job, + AMDGPU_KERNEL_JOB_ID_KFD_GART_MAP); + if (r) + return r; + + src_addr = num_dw * 4; + src_addr += job->ibs[0].gpu_addr; + + dst_addr = amdgpu_bo_gpu_offset(adev->gart.bo); + amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr, + dst_addr, num_bytes, 0); + + amdgpu_ring_pad_ib(ring, &job->ibs[0]); + WARN_ON(job->ibs[0].length_dw > num_dw); + + pte_flags = AMDGPU_PTE_VALID | AMDGPU_PTE_READABLE; + pte_flags |= AMDGPU_PTE_SYSTEM | AMDGPU_PTE_SNOOPED; + if (!(flags & KFD_IOCTL_SVM_FLAG_GPU_RO)) + pte_flags |= AMDGPU_PTE_WRITEABLE; + pte_flags |= adev->gart.gart_pte_flags; + + cpu_addr = &job->ibs[0].ptr[num_dw]; + + amdgpu_gart_map(adev, 0, npages, addr, pte_flags, cpu_addr); + fence = amdgpu_job_submit(job); + dma_fence_put(fence); + + return r; +} + +/** + * svm_migrate_copy_memory_gart - sdma copy data between ram and vram + * + * @adev: amdgpu device the sdma ring running + * @sys: system DMA pointer to be copied + * @vram: vram destination DMA pointer + * @npages: number of pages to copy + * @direction: enum MIGRATION_COPY_DIR + * @mfence: output, sdma fence to signal after sdma is done + * + * ram address uses GART table continuous entries mapping to ram pages, + * vram address uses direct mapping of vram pages, which must have npages + * number of continuous pages. + * GART update and sdma uses same buf copy function ring, sdma is splited to + * multiple GTT_MAX_PAGES transfer, all sdma operations are serialized, wait for + * the last sdma finish fence which is returned to check copy memory is done. + * + * Context: Process context, takes and releases gtt_window_lock + * + * Return: + * 0 - OK, otherwise error code + */ + +static int +svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys, + u64 *vram, u64 npages, + enum MIGRATION_COPY_DIR direction, + struct dma_fence **mfence) +{ + const u64 GTT_MAX_PAGES = AMDGPU_GTT_MAX_TRANSFER_SIZE; + struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; + u64 gart_s, gart_d; + struct dma_fence *next; + u64 size; + int r; + + mutex_lock(&adev->mman.gtt_window_lock); + + while (npages) { + size = min(GTT_MAX_PAGES, npages); + + if (direction == FROM_VRAM_TO_RAM) { + gart_s = svm_migrate_direct_mapping_addr(adev, *vram); + r = svm_migrate_gart_map(ring, size, sys, &gart_d, 0); + + } else if (direction == FROM_RAM_TO_VRAM) { + r = svm_migrate_gart_map(ring, size, sys, &gart_s, + KFD_IOCTL_SVM_FLAG_GPU_RO); + gart_d = svm_migrate_direct_mapping_addr(adev, *vram); + } + if (r) { + dev_err(adev->dev, "fail %d create gart mapping\n", r); + goto out_unlock; + } + + r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE, + NULL, &next, false, true, 0); + if (r) { + dev_err(adev->dev, "fail %d to copy memory\n", r); + goto out_unlock; + } + + dma_fence_put(*mfence); + *mfence = next; + npages -= size; + if (npages) { + sys += size; + vram += size; + } + } + +out_unlock: + mutex_unlock(&adev->mman.gtt_window_lock); + + return r; +} + +/** + * svm_migrate_copy_done - wait for memory copy sdma is done + * + * @adev: amdgpu device the sdma memory copy is executing on + * @mfence: migrate fence + * + * Wait for dma fence is signaled, if the copy ssplit into multiple sdma + * operations, this is the last sdma operation fence. + * + * Context: called after svm_migrate_copy_memory + * + * Return: + * 0 - success + * otherwise - error code from dma fence signal + */ +static int +svm_migrate_copy_done(struct amdgpu_device *adev, struct dma_fence *mfence) +{ + int r = 0; + + if (mfence) { + r = dma_fence_wait(mfence, false); + dma_fence_put(mfence); + pr_debug("sdma copy memory fence done\n"); + } + + return r; +} + +unsigned long +svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr) +{ + return (addr + adev->kfd.pgmap.range.start) >> PAGE_SHIFT; +} + +static void +svm_migrate_get_vram_page(struct svm_range *prange, unsigned long pfn) +{ + struct page *page; + + page = pfn_to_page(pfn); + svm_range_bo_ref(prange->svm_bo); + page->zone_device_data = prange->svm_bo; + zone_device_page_init(page, 0); +} + +static void +svm_migrate_put_vram_page(struct amdgpu_device *adev, unsigned long addr) +{ + struct page *page; + + page = pfn_to_page(svm_migrate_addr_to_pfn(adev, addr)); + unlock_page(page); + put_page(page); +} + +static unsigned long +svm_migrate_addr(struct amdgpu_device *adev, struct page *page) +{ + unsigned long addr; + + addr = page_to_pfn(page) << PAGE_SHIFT; + return (addr - adev->kfd.pgmap.range.start); +} + +static struct page * +svm_migrate_get_sys_page(struct vm_area_struct *vma, unsigned long addr) +{ + struct page *page; + + page = alloc_page_vma(GFP_HIGHUSER, vma, addr); + if (page) + lock_page(page); + + return page; +} + +static void svm_migrate_put_sys_page(unsigned long addr) +{ + struct page *page; + + page = pfn_to_page(addr >> PAGE_SHIFT); + unlock_page(page); + put_page(page); +} + +static unsigned long svm_migrate_successful_pages(struct migrate_vma *migrate) +{ + unsigned long mpages = 0; + unsigned long i; + + for (i = 0; i < migrate->npages; i++) { + if (migrate->dst[i] & MIGRATE_PFN_VALID && + migrate->src[i] & MIGRATE_PFN_MIGRATE) + mpages++; + } + return mpages; +} + +static int +svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange, + struct migrate_vma *migrate, struct dma_fence **mfence, + dma_addr_t *scratch, u64 ttm_res_offset) +{ + u64 npages = migrate->npages; + struct amdgpu_device *adev = node->adev; + struct device *dev = adev->dev; + struct amdgpu_res_cursor cursor; + u64 mpages = 0; + dma_addr_t *src; + u64 *dst; + u64 i, j; + int r; + + pr_debug("svms 0x%p [0x%lx 0x%lx 0x%llx]\n", prange->svms, prange->start, + prange->last, ttm_res_offset); + + src = scratch; + dst = (u64 *)(scratch + npages); + + amdgpu_res_first(prange->ttm_res, ttm_res_offset, + npages << PAGE_SHIFT, &cursor); + for (i = j = 0; (i < npages) && (mpages < migrate->cpages); i++) { + struct page *spage; + + if (migrate->src[i] & MIGRATE_PFN_MIGRATE) { + dst[i] = cursor.start + (j << PAGE_SHIFT); + migrate->dst[i] = svm_migrate_addr_to_pfn(adev, dst[i]); + svm_migrate_get_vram_page(prange, migrate->dst[i]); + migrate->dst[i] = migrate_pfn(migrate->dst[i]); + mpages++; + } + spage = migrate_pfn_to_page(migrate->src[i]); + if (spage && !is_zone_device_page(spage)) { + src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE, + DMA_BIDIRECTIONAL); + r = dma_mapping_error(dev, src[i]); + if (r) { + dev_err(dev, "%s: fail %d dma_map_page\n", + __func__, r); + goto out_free_vram_pages; + } + } else { + if (j) { + r = svm_migrate_copy_memory_gart( + adev, src + i - j, + dst + i - j, j, + FROM_RAM_TO_VRAM, + mfence); + if (r) + goto out_free_vram_pages; + amdgpu_res_next(&cursor, (j + 1) << PAGE_SHIFT); + j = 0; + } else { + amdgpu_res_next(&cursor, PAGE_SIZE); + } + continue; + } + + pr_debug_ratelimited("dma mapping src to 0x%llx, pfn 0x%lx\n", + src[i] >> PAGE_SHIFT, page_to_pfn(spage)); + + if (j >= (cursor.size >> PAGE_SHIFT) - 1 && i < npages - 1) { + r = svm_migrate_copy_memory_gart(adev, src + i - j, + dst + i - j, j + 1, + FROM_RAM_TO_VRAM, + mfence); + if (r) + goto out_free_vram_pages; + amdgpu_res_next(&cursor, (j + 1) * PAGE_SIZE); + j = 0; + } else { + j++; + } + } + + r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j, + FROM_RAM_TO_VRAM, mfence); + +out_free_vram_pages: + if (r) { + pr_debug("failed %d to copy memory to vram\n", r); + for (i = 0; i < npages && mpages; i++) { + if (!dst[i]) + continue; + svm_migrate_put_vram_page(adev, dst[i]); + migrate->dst[i] = 0; + mpages--; + } + } + +#ifdef DEBUG_FORCE_MIXED_DOMAINS + for (i = 0, j = 0; i < npages; i += 4, j++) { + if (j & 1) + continue; + svm_migrate_put_vram_page(adev, dst[i]); + migrate->dst[i] = 0; + svm_migrate_put_vram_page(adev, dst[i + 1]); + migrate->dst[i + 1] = 0; + svm_migrate_put_vram_page(adev, dst[i + 2]); + migrate->dst[i + 2] = 0; + svm_migrate_put_vram_page(adev, dst[i + 3]); + migrate->dst[i + 3] = 0; + } +#endif + + return r; +} + +static long +svm_migrate_vma_to_vram(struct kfd_node *node, struct svm_range *prange, + struct vm_area_struct *vma, u64 start, + u64 end, uint32_t trigger, u64 ttm_res_offset) +{ + struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); + u64 npages = (end - start) >> PAGE_SHIFT; + struct amdgpu_device *adev = node->adev; + struct kfd_process_device *pdd; + struct dma_fence *mfence = NULL; + struct migrate_vma migrate = { 0 }; + unsigned long cpages = 0; + unsigned long mpages = 0; + dma_addr_t *scratch; + void *buf; + int r = -ENOMEM; + + memset(&migrate, 0, sizeof(migrate)); + migrate.vma = vma; + migrate.start = start; + migrate.end = end; + migrate.flags = MIGRATE_VMA_SELECT_SYSTEM; + migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); + + buf = kvcalloc(npages, + 2 * sizeof(*migrate.src) + sizeof(u64) + sizeof(dma_addr_t), + GFP_KERNEL); + if (!buf) + goto out; + + migrate.src = buf; + migrate.dst = migrate.src + npages; + scratch = (dma_addr_t *)(migrate.dst + npages); + + kfd_smi_event_migration_start(node, p->lead_thread->pid, + start >> PAGE_SHIFT, end >> PAGE_SHIFT, + 0, node->id, prange->prefetch_loc, + prange->preferred_loc, trigger); + + r = migrate_vma_setup(&migrate); + if (r) { + dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", + __func__, r, prange->start, prange->last); + goto out_free; + } + + cpages = migrate.cpages; + if (!cpages) { + pr_debug("failed collect migrate sys pages [0x%lx 0x%lx]\n", + prange->start, prange->last); + goto out_free; + } + if (cpages != npages) + pr_debug("partial migration, 0x%lx/0x%llx pages collected\n", + cpages, npages); + else + pr_debug("0x%lx pages collected\n", cpages); + + r = svm_migrate_copy_to_vram(node, prange, &migrate, &mfence, scratch, ttm_res_offset); + migrate_vma_pages(&migrate); + + svm_migrate_copy_done(adev, mfence); + migrate_vma_finalize(&migrate); + + mpages = svm_migrate_successful_pages(&migrate); + pr_debug("migrated/collected/requested 0x%lx/0x%lx/0x%lx\n", + mpages, cpages, migrate.npages); + + svm_range_dma_unmap_dev(adev->dev, scratch, 0, npages); + +out_free: + kvfree(buf); + kfd_smi_event_migration_end(node, p->lead_thread->pid, + start >> PAGE_SHIFT, end >> PAGE_SHIFT, + 0, node->id, trigger, r); +out: + if (!r && mpages) { + pdd = svm_range_get_pdd_by_node(prange, node); + if (pdd) + WRITE_ONCE(pdd->page_in, pdd->page_in + mpages); + + return mpages; + } + return r; +} + +/** + * svm_migrate_ram_to_vram - migrate svm range from system to device + * @prange: range structure + * @best_loc: the device to migrate to + * @start_mgr: start page to migrate + * @last_mgr: last page to migrate + * @mm: the process mm structure + * @trigger: reason of migration + * + * Context: Process context, caller hold mmap read lock, svms lock, prange lock + * + * Return: + * 0 - OK, otherwise error code + */ +static int +svm_migrate_ram_to_vram(struct svm_range *prange, uint32_t best_loc, + unsigned long start_mgr, unsigned long last_mgr, + struct mm_struct *mm, uint32_t trigger) +{ + unsigned long addr, start, end; + struct vm_area_struct *vma; + u64 ttm_res_offset; + struct kfd_node *node; + unsigned long mpages = 0; + long r = 0; + + if (start_mgr < prange->start || last_mgr > prange->last) { + pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n", + start_mgr, last_mgr, prange->start, prange->last); + return -EFAULT; + } + + node = svm_range_get_node_by_id(prange, best_loc); + if (!node) { + pr_debug("failed to get kfd node by id 0x%x\n", best_loc); + return -ENODEV; + } + + pr_debug("svms 0x%p [0x%lx 0x%lx] in [0x%lx 0x%lx] to gpu 0x%x\n", + prange->svms, start_mgr, last_mgr, prange->start, prange->last, + best_loc); + + start = start_mgr << PAGE_SHIFT; + end = (last_mgr + 1) << PAGE_SHIFT; + + r = amdgpu_amdkfd_reserve_mem_limit(node->adev, + prange->npages * PAGE_SIZE, + KFD_IOC_ALLOC_MEM_FLAGS_VRAM, + node->xcp ? node->xcp->id : 0); + if (r) { + dev_dbg(node->adev->dev, "failed to reserve VRAM, r: %ld\n", r); + return -ENOSPC; + } + + r = svm_range_vram_node_new(node, prange, true); + if (r) { + dev_dbg(node->adev->dev, "fail %ld to alloc vram\n", r); + goto out; + } + ttm_res_offset = (start_mgr - prange->start + prange->offset) << PAGE_SHIFT; + + for (addr = start; addr < end;) { + unsigned long next; + + vma = vma_lookup(mm, addr); + if (!vma) + break; + + next = min(vma->vm_end, end); + r = svm_migrate_vma_to_vram(node, prange, vma, addr, next, trigger, ttm_res_offset); + if (r < 0) { + pr_debug("failed %ld to migrate\n", r); + break; + } else { + mpages += r; + } + ttm_res_offset += next - addr; + addr = next; + } + + if (mpages) { + prange->actual_loc = best_loc; + prange->vram_pages += mpages; + } else if (!prange->actual_loc) { + /* if no page migrated and all pages from prange are at + * sys ram drop svm_bo got from svm_range_vram_node_new + */ + svm_range_vram_node_free(prange); + } + +out: + amdgpu_amdkfd_unreserve_mem_limit(node->adev, + prange->npages * PAGE_SIZE, + KFD_IOC_ALLOC_MEM_FLAGS_VRAM, + node->xcp ? node->xcp->id : 0); + return r < 0 ? r : 0; +} + +static void svm_migrate_folio_free(struct folio *folio) +{ + struct page *page = &folio->page; + struct svm_range_bo *svm_bo = page->zone_device_data; + + if (svm_bo) { + pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref)); + svm_range_bo_unref_async(svm_bo); + } +} + +static int +svm_migrate_copy_to_ram(struct amdgpu_device *adev, struct svm_range *prange, + struct migrate_vma *migrate, struct dma_fence **mfence, + dma_addr_t *scratch, u64 npages) +{ + struct device *dev = adev->dev; + u64 *src; + dma_addr_t *dst; + struct page *dpage; + u64 i = 0, j; + u64 addr; + int r = 0; + + pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, + prange->last); + + addr = migrate->start; + + src = (u64 *)(scratch + npages); + dst = scratch; + + for (i = 0, j = 0; i < npages; i++, addr += PAGE_SIZE) { + struct page *spage; + + spage = migrate_pfn_to_page(migrate->src[i]); + if (!spage || !is_zone_device_page(spage)) { + pr_debug("invalid page. Could be in CPU already svms 0x%p [0x%lx 0x%lx]\n", + prange->svms, prange->start, prange->last); + if (j) { + r = svm_migrate_copy_memory_gart(adev, dst + i - j, + src + i - j, j, + FROM_VRAM_TO_RAM, + mfence); + if (r) + goto out_oom; + j = 0; + } + continue; + } + src[i] = svm_migrate_addr(adev, spage); + if (j > 0 && src[i] != src[i - 1] + PAGE_SIZE) { + r = svm_migrate_copy_memory_gart(adev, dst + i - j, + src + i - j, j, + FROM_VRAM_TO_RAM, + mfence); + if (r) + goto out_oom; + j = 0; + } + + dpage = svm_migrate_get_sys_page(migrate->vma, addr); + if (!dpage) { + pr_debug("failed get page svms 0x%p [0x%lx 0x%lx]\n", + prange->svms, prange->start, prange->last); + r = -ENOMEM; + goto out_oom; + } + + dst[i] = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL); + r = dma_mapping_error(dev, dst[i]); + if (r) { + dev_err(adev->dev, "%s: fail %d dma_map_page\n", __func__, r); + goto out_oom; + } + + pr_debug_ratelimited("dma mapping dst to 0x%llx, pfn 0x%lx\n", + dst[i] >> PAGE_SHIFT, page_to_pfn(dpage)); + + migrate->dst[i] = migrate_pfn(page_to_pfn(dpage)); + j++; + } + + r = svm_migrate_copy_memory_gart(adev, dst + i - j, src + i - j, j, + FROM_VRAM_TO_RAM, mfence); + +out_oom: + if (r) { + pr_debug("failed %d copy to ram\n", r); + while (i--) { + svm_migrate_put_sys_page(dst[i]); + migrate->dst[i] = 0; + } + } + + return r; +} + +/** + * svm_migrate_vma_to_ram - migrate range inside one vma from device to system + * + * @prange: svm range structure + * @vma: vm_area_struct that range [start, end] belongs to + * @start: range start virtual address in pages + * @end: range end virtual address in pages + * @node: kfd node device to migrate from + * @trigger: reason of migration + * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback + * + * Context: Process context, caller hold mmap read lock, prange->migrate_mutex + * + * Return: + * negative values - indicate error + * positive values or zero - number of pages got migrated + */ +static long +svm_migrate_vma_to_ram(struct kfd_node *node, struct svm_range *prange, + struct vm_area_struct *vma, u64 start, u64 end, + uint32_t trigger, struct page *fault_page) +{ + struct kfd_process *p = container_of(prange->svms, struct kfd_process, svms); + u64 npages = (end - start) >> PAGE_SHIFT; + unsigned long cpages = 0; + unsigned long mpages = 0; + struct amdgpu_device *adev = node->adev; + struct kfd_process_device *pdd; + struct dma_fence *mfence = NULL; + struct migrate_vma migrate = { 0 }; + dma_addr_t *scratch; + void *buf; + int r = -ENOMEM; + + memset(&migrate, 0, sizeof(migrate)); + migrate.vma = vma; + migrate.start = start; + migrate.end = end; + migrate.pgmap_owner = SVM_ADEV_PGMAP_OWNER(adev); + if (adev->gmc.xgmi.connected_to_cpu) + migrate.flags = MIGRATE_VMA_SELECT_DEVICE_COHERENT; + else + migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; + + buf = kvcalloc(npages, + 2 * sizeof(*migrate.src) + sizeof(u64) + sizeof(dma_addr_t), + GFP_KERNEL); + if (!buf) + goto out; + + migrate.src = buf; + migrate.dst = migrate.src + npages; + migrate.fault_page = fault_page; + scratch = (dma_addr_t *)(migrate.dst + npages); + + kfd_smi_event_migration_start(node, p->lead_thread->pid, + start >> PAGE_SHIFT, end >> PAGE_SHIFT, + node->id, 0, prange->prefetch_loc, + prange->preferred_loc, trigger); + + r = migrate_vma_setup(&migrate); + if (r) { + dev_err(adev->dev, "%s: vma setup fail %d range [0x%lx 0x%lx]\n", + __func__, r, prange->start, prange->last); + goto out_free; + } + + cpages = migrate.cpages; + if (!cpages) { + pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n", + prange->start, prange->last); + goto out_free; + } + if (cpages != npages) + pr_debug("partial migration, 0x%lx/0x%llx pages collected\n", + cpages, npages); + else + pr_debug("0x%lx pages collected\n", cpages); + + r = svm_migrate_copy_to_ram(adev, prange, &migrate, &mfence, + scratch, npages); + migrate_vma_pages(&migrate); + + mpages = svm_migrate_successful_pages(&migrate); + pr_debug("migrated/collected/requested 0x%lx/0x%lx/0x%lx\n", + mpages, cpages, migrate.npages); + + svm_migrate_copy_done(adev, mfence); + migrate_vma_finalize(&migrate); + + svm_range_dma_unmap_dev(adev->dev, scratch, 0, npages); + +out_free: + kvfree(buf); + kfd_smi_event_migration_end(node, p->lead_thread->pid, + start >> PAGE_SHIFT, end >> PAGE_SHIFT, + node->id, 0, trigger, r); +out: + if (!r && mpages) { + pdd = svm_range_get_pdd_by_node(prange, node); + if (pdd) + WRITE_ONCE(pdd->page_out, pdd->page_out + mpages); + } + + return r ? r : mpages; +} + +/** + * svm_migrate_vram_to_ram - migrate svm range from device to system + * @prange: range structure + * @mm: process mm, use current->mm if NULL + * @start_mgr: start page need be migrated to sys ram + * @last_mgr: last page need be migrated to sys ram + * @trigger: reason of migration + * @fault_page: is from vmf->page, svm_migrate_to_ram(), this is CPU page fault callback + * + * Context: Process context, caller hold mmap read lock, prange->migrate_mutex + * + * Return: + * 0 - OK, otherwise error code + */ +int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm, + unsigned long start_mgr, unsigned long last_mgr, + uint32_t trigger, struct page *fault_page) +{ + struct kfd_node *node; + struct vm_area_struct *vma; + unsigned long addr; + unsigned long start; + unsigned long end; + unsigned long mpages = 0; + long r = 0; + + /* this pragne has no any vram page to migrate to sys ram */ + if (!prange->actual_loc) { + pr_debug("[0x%lx 0x%lx] already migrated to ram\n", + prange->start, prange->last); + return 0; + } + + if (start_mgr < prange->start || last_mgr > prange->last) { + pr_debug("range [0x%lx 0x%lx] out prange [0x%lx 0x%lx]\n", + start_mgr, last_mgr, prange->start, prange->last); + return -EFAULT; + } + + node = svm_range_get_node_by_id(prange, prange->actual_loc); + if (!node) { + pr_debug("failed to get kfd node by id 0x%x\n", prange->actual_loc); + return -ENODEV; + } + pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx] from gpu 0x%x to ram\n", + prange->svms, prange, start_mgr, last_mgr, + prange->actual_loc); + + start = start_mgr << PAGE_SHIFT; + end = (last_mgr + 1) << PAGE_SHIFT; + + for (addr = start; addr < end;) { + unsigned long next; + + vma = vma_lookup(mm, addr); + if (!vma) { + pr_debug("failed to find vma for prange %p\n", prange); + r = -EFAULT; + break; + } + + next = min(vma->vm_end, end); + r = svm_migrate_vma_to_ram(node, prange, vma, addr, next, trigger, + fault_page); + if (r < 0) { + pr_debug("failed %ld to migrate prange %p\n", r, prange); + break; + } else { + mpages += r; + } + addr = next; + } + + if (r >= 0) { + WARN_ONCE(prange->vram_pages < mpages, + "Recorded vram pages(0x%llx) should not be less than migration pages(0x%lx).", + prange->vram_pages, mpages); + prange->vram_pages -= mpages; + + /* prange does not have vram page set its actual_loc to system + * and drop its svm_bo ref + */ + if (prange->vram_pages == 0 && prange->ttm_res) { + prange->actual_loc = 0; + svm_range_vram_node_free(prange); + } + } + + return r < 0 ? r : 0; +} + +/** + * svm_migrate_vram_to_vram - migrate svm range from device to device + * @prange: range structure + * @best_loc: the device to migrate to + * @start: start page need be migrated to sys ram + * @last: last page need be migrated to sys ram + * @mm: process mm, use current->mm if NULL + * @trigger: reason of migration + * + * Context: Process context, caller hold mmap read lock, svms lock, prange lock + * + * migrate all vram pages in prange to sys ram, then migrate + * [start, last] pages from sys ram to gpu node best_loc. + * + * Return: + * 0 - OK, otherwise error code + */ +static int +svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc, + unsigned long start, unsigned long last, + struct mm_struct *mm, uint32_t trigger) +{ + int r, retries = 3; + + /* + * TODO: for both devices with PCIe large bar or on same xgmi hive, skip + * system memory as migration bridge + */ + + pr_debug("from gpu 0x%x to gpu 0x%x\n", prange->actual_loc, best_loc); + + do { + r = svm_migrate_vram_to_ram(prange, mm, prange->start, prange->last, + trigger, NULL); + if (r) + return r; + } while (prange->actual_loc && --retries); + + if (prange->actual_loc) + return -EDEADLK; + + return svm_migrate_ram_to_vram(prange, best_loc, start, last, mm, trigger); +} + +int +svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc, + unsigned long start, unsigned long last, + struct mm_struct *mm, uint32_t trigger) +{ + if (!prange->actual_loc || prange->actual_loc == best_loc) + return svm_migrate_ram_to_vram(prange, best_loc, start, last, + mm, trigger); + + else + return svm_migrate_vram_to_vram(prange, best_loc, start, last, + mm, trigger); + +} + +/** + * svm_migrate_to_ram - CPU page fault handler + * @vmf: CPU vm fault vma, address + * + * Context: vm fault handler, caller holds the mmap read lock + * + * Return: + * 0 - OK + * VM_FAULT_SIGBUS - notice application to have SIGBUS page fault + */ +static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf) +{ + unsigned long start, last, size; + unsigned long addr = vmf->address; + struct svm_range_bo *svm_bo; + struct svm_range *prange; + struct kfd_process *p; + struct mm_struct *mm; + int r = 0; + + svm_bo = vmf->page->zone_device_data; + if (!svm_bo) { + pr_debug("failed get device page at addr 0x%lx\n", addr); + return VM_FAULT_SIGBUS; + } + if (!mmget_not_zero(svm_bo->eviction_fence->mm)) { + pr_debug("addr 0x%lx of process mm is destroyed\n", addr); + return VM_FAULT_SIGBUS; + } + + mm = svm_bo->eviction_fence->mm; + if (mm != vmf->vma->vm_mm) + pr_debug("addr 0x%lx is COW mapping in child process\n", addr); + + p = kfd_lookup_process_by_mm(mm); + if (!p) { + pr_debug("failed find process at fault address 0x%lx\n", addr); + r = VM_FAULT_SIGBUS; + goto out_mmput; + } + if (READ_ONCE(p->svms.faulting_task) == current) { + pr_debug("skipping ram migration\n"); + r = 0; + goto out_unref_process; + } + + pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr); + addr >>= PAGE_SHIFT; + + mutex_lock(&p->svms.lock); + + prange = svm_range_from_addr(&p->svms, addr, NULL); + if (!prange) { + pr_debug("failed get range svms 0x%p addr 0x%lx\n", &p->svms, addr); + r = -EFAULT; + goto out_unlock_svms; + } + + mutex_lock(&prange->migrate_mutex); + + if (!prange->actual_loc) + goto out_unlock_prange; + + /* Align migration range start and size to granularity size */ + size = 1UL << prange->granularity; + start = max(ALIGN_DOWN(addr, size), prange->start); + last = min(ALIGN(addr + 1, size) - 1, prange->last); + + r = svm_migrate_vram_to_ram(prange, vmf->vma->vm_mm, start, last, + KFD_MIGRATE_TRIGGER_PAGEFAULT_CPU, vmf->page); + if (r) + pr_debug("failed %d migrate svms 0x%p range 0x%p [0x%lx 0x%lx]\n", + r, prange->svms, prange, start, last); + +out_unlock_prange: + mutex_unlock(&prange->migrate_mutex); +out_unlock_svms: + mutex_unlock(&p->svms.lock); +out_unref_process: + pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); + kfd_unref_process(p); +out_mmput: + mmput(mm); + return r ? VM_FAULT_SIGBUS : 0; +} + +static const struct dev_pagemap_ops svm_migrate_pgmap_ops = { + .folio_free = svm_migrate_folio_free, + .migrate_to_ram = svm_migrate_to_ram, +}; + +/* Each VRAM page uses sizeof(struct page) on system memory */ +#define SVM_HMM_PAGE_STRUCT_SIZE(size) ((size)/PAGE_SIZE * sizeof(struct page)) + +int kgd2kfd_init_zone_device(struct amdgpu_device *adev) +{ + struct amdgpu_kfd_dev *kfddev = &adev->kfd; + struct dev_pagemap *pgmap; + struct resource *res = NULL; + unsigned long size; + void *r; + + /* Page migration works on gfx9 or newer */ + if (amdgpu_ip_version(adev, GC_HWIP, 0) < IP_VERSION(9, 0, 1)) + return -EINVAL; + + if (adev->apu_prefer_gtt) + return 0; + + pgmap = &kfddev->pgmap; + memset(pgmap, 0, sizeof(*pgmap)); + + /* TODO: register all vram to HMM for now. + * should remove reserved size + */ + size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20); + if (adev->gmc.xgmi.connected_to_cpu) { + pgmap->range.start = adev->gmc.aper_base; + pgmap->range.end = adev->gmc.aper_base + adev->gmc.aper_size - 1; + pgmap->type = MEMORY_DEVICE_COHERENT; + } else { + res = devm_request_free_mem_region(adev->dev, &iomem_resource, size); + if (IS_ERR(res)) + return PTR_ERR(res); + pgmap->range.start = res->start; + pgmap->range.end = res->end; + pgmap->type = MEMORY_DEVICE_PRIVATE; + } + + pgmap->nr_range = 1; + pgmap->ops = &svm_migrate_pgmap_ops; + pgmap->owner = SVM_ADEV_PGMAP_OWNER(adev); + pgmap->flags = 0; + /* Device manager releases device-specific resources, memory region and + * pgmap when driver disconnects from device. + */ + r = devm_memremap_pages(adev->dev, pgmap); + if (IS_ERR(r)) { + pr_err("failed to register HMM device memory\n"); + if (pgmap->type == MEMORY_DEVICE_PRIVATE) + devm_release_mem_region(adev->dev, res->start, resource_size(res)); + /* Disable SVM support capability */ + pgmap->type = 0; + return PTR_ERR(r); + } + + pr_debug("reserve %ldMB system memory for VRAM pages struct\n", + SVM_HMM_PAGE_STRUCT_SIZE(size) >> 20); + + amdgpu_amdkfd_reserve_system_mem(SVM_HMM_PAGE_STRUCT_SIZE(size)); + + pr_info("HMM registered %ldMB device memory\n", size >> 20); + + return 0; +} |