diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdkfd/kfd_migrate.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 937 |
1 files changed, 937 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..fd8f544f0de2 --- /dev/null +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -0,0 +1,937 @@ +// 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/hmm.h> +#include <linux/dma-direction.h> +#include <linux/dma-mapping.h> +#include "amdgpu_sync.h" +#include "amdgpu_object.h" +#include "amdgpu_vm.h" +#include "amdgpu_mn.h" +#include "kfd_priv.h" +#include "kfd_svm.h" +#include "kfd_migrate.h" + +static uint64_t +svm_migrate_direct_mapping_addr(struct amdgpu_device *adev, uint64_t addr) +{ + return addr + amdgpu_ttm_domain_start(adev, TTM_PL_VRAM); +} + +static int +svm_migrate_gart_map(struct amdgpu_ring *ring, uint64_t npages, + dma_addr_t *addr, uint64_t *gart_addr, uint64_t flags) +{ + struct amdgpu_device *adev = ring->adev; + struct amdgpu_job *job; + unsigned int num_dw, num_bytes; + struct dma_fence *fence; + uint64_t src_addr, dst_addr; + uint64_t 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, num_dw * 4 + num_bytes, + AMDGPU_IB_POOL_DELAYED, &job); + 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, false); + + 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]; + + r = amdgpu_gart_map(adev, 0, npages, addr, pte_flags, cpu_addr); + if (r) + goto error_free; + + r = amdgpu_job_submit(job, &adev->mman.entity, + AMDGPU_FENCE_OWNER_UNDEFINED, &fence); + if (r) + goto error_free; + + dma_fence_put(fence); + + return r; + +error_free: + amdgpu_job_free(job); + return r; +} + +/** + * svm_migrate_copy_memory_gart - sdma copy data between ram and vram + * + * @adev: amdgpu device the sdma ring running + * @src: source page address array + * @dst: destination page address array + * @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, + uint64_t *vram, uint64_t npages, + enum MIGRATION_COPY_DIR direction, + struct dma_fence **mfence) +{ + const uint64_t GTT_MAX_PAGES = AMDGPU_GTT_MAX_TRANSFER_SIZE; + struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; + uint64_t gart_s, gart_d; + struct dma_fence *next; + uint64_t 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) { + pr_debug("failed %d to create gart mapping\n", r); + goto out_unlock; + } + + r = amdgpu_copy_buffer(ring, gart_s, gart_d, size * PAGE_SIZE, + NULL, &next, false, true, false); + if (r) { + pr_debug("failed %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; +} + +static uint64_t +svm_migrate_node_physical_addr(struct amdgpu_device *adev, + struct drm_mm_node **mm_node, uint64_t *offset) +{ + struct drm_mm_node *node = *mm_node; + uint64_t pos = *offset; + + if (node->start == AMDGPU_BO_INVALID_OFFSET) { + pr_debug("drm node is not validated\n"); + return 0; + } + + pr_debug("vram node start 0x%llx npages 0x%llx\n", node->start, + node->size); + + if (pos >= node->size) { + do { + pos -= node->size; + node++; + } while (pos >= node->size); + + *mm_node = node; + *offset = pos; + } + + return (node->start + pos) << PAGE_SHIFT; +} + +unsigned long +svm_migrate_addr_to_pfn(struct amdgpu_device *adev, unsigned long addr) +{ + return (addr + adev->kfd.dev->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); + page->zone_device_data = prange; + get_page(page); + lock_page(page); +} + +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.dev->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 int +svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange, + struct migrate_vma *migrate, struct dma_fence **mfence, + dma_addr_t *scratch) +{ + uint64_t npages = migrate->cpages; + struct device *dev = adev->dev; + struct drm_mm_node *node; + dma_addr_t *src; + uint64_t *dst; + uint64_t vram_addr; + uint64_t offset; + uint64_t i, j; + int r; + + pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, + prange->last); + + src = scratch; + dst = (uint64_t *)(scratch + npages); + + r = svm_range_vram_node_new(adev, prange, true); + if (r) { + pr_debug("failed %d get 0x%llx pages from vram\n", r, npages); + goto out; + } + + node = prange->ttm_res->mm_node; + offset = prange->offset; + vram_addr = svm_migrate_node_physical_addr(adev, &node, &offset); + if (!vram_addr) { + WARN_ONCE(1, "vram node address is 0\n"); + r = -ENOMEM; + goto out; + } + + for (i = j = 0; i < npages; i++) { + struct page *spage; + + dst[i] = vram_addr + (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]); + migrate->dst[i] |= MIGRATE_PFN_LOCKED; + + if (migrate->src[i] & MIGRATE_PFN_VALID) { + spage = migrate_pfn_to_page(migrate->src[i]); + src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE, + DMA_TO_DEVICE); + r = dma_mapping_error(dev, src[i]); + if (r) { + pr_debug("failed %d dma_map_page\n", 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; + offset += j; + vram_addr = (node->start + offset) << PAGE_SHIFT; + j = 0; + } else { + offset++; + vram_addr += PAGE_SIZE; + } + if (offset >= node->size) { + node++; + pr_debug("next node size 0x%llx\n", node->size); + vram_addr = node->start << PAGE_SHIFT; + offset = 0; + } + continue; + } + + pr_debug("dma mapping src to 0x%llx, page_to_pfn 0x%lx\n", + src[i] >> PAGE_SHIFT, page_to_pfn(spage)); + + if (j + offset >= node->size - 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; + + node++; + pr_debug("next node size 0x%llx\n", node->size); + vram_addr = node->start << PAGE_SHIFT; + offset = 0; + 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); + while (i--) { + svm_migrate_put_vram_page(adev, dst[i]); + migrate->dst[i] = 0; + } + } + +out: + return r; +} + +static int +svm_migrate_vma_to_vram(struct amdgpu_device *adev, struct svm_range *prange, + struct vm_area_struct *vma, uint64_t start, + uint64_t end) +{ + uint64_t npages = (end - start) >> PAGE_SHIFT; + struct dma_fence *mfence = NULL; + struct migrate_vma migrate; + dma_addr_t *scratch; + size_t size; + void *buf; + int r = -ENOMEM; + int retry = 0; + + memset(&migrate, 0, sizeof(migrate)); + migrate.vma = vma; + migrate.start = start; + migrate.end = end; + migrate.flags = MIGRATE_VMA_SELECT_SYSTEM; + migrate.pgmap_owner = adev; + + size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t); + size *= npages; + buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); + if (!buf) + goto out; + + migrate.src = buf; + migrate.dst = migrate.src + npages; + scratch = (dma_addr_t *)(migrate.dst + npages); + +retry: + r = migrate_vma_setup(&migrate); + if (r) { + pr_debug("failed %d prepare migrate svms 0x%p [0x%lx 0x%lx]\n", + r, prange->svms, prange->start, prange->last); + goto out_free; + } + if (migrate.cpages != npages) { + pr_debug("collect 0x%lx/0x%llx pages, retry\n", migrate.cpages, + npages); + migrate_vma_finalize(&migrate); + if (retry++ >= 3) { + r = -ENOMEM; + pr_debug("failed %d migrate svms 0x%p [0x%lx 0x%lx]\n", + r, prange->svms, prange->start, prange->last); + goto out_free; + } + + goto retry; + } + + if (migrate.cpages) { + r = svm_migrate_copy_to_vram(adev, prange, &migrate, &mfence, + scratch); + migrate_vma_pages(&migrate); + svm_migrate_copy_done(adev, mfence); + migrate_vma_finalize(&migrate); + } + + svm_range_dma_unmap(adev->dev, scratch, 0, npages); + svm_range_free_dma_mappings(prange); + +out_free: + kvfree(buf); +out: + return r; +} + +/** + * svm_migrate_ram_to_vram - migrate svm range from system to device + * @prange: range structure + * @best_loc: the device to migrate to + * @mm: the process mm structure + * + * 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, + struct mm_struct *mm) +{ + unsigned long addr, start, end; + struct vm_area_struct *vma; + struct amdgpu_device *adev; + int r = 0; + + if (prange->actual_loc == best_loc) { + pr_debug("svms 0x%p [0x%lx 0x%lx] already on best_loc 0x%x\n", + prange->svms, prange->start, prange->last, best_loc); + return 0; + } + + adev = svm_range_get_adev_by_id(prange, best_loc); + if (!adev) { + pr_debug("failed to get device by id 0x%x\n", best_loc); + return -ENODEV; + } + + pr_debug("svms 0x%p [0x%lx 0x%lx] to gpu 0x%x\n", prange->svms, + prange->start, prange->last, best_loc); + + /* FIXME: workaround for page locking bug with invalid pages */ + svm_range_prefault(prange, mm); + + start = prange->start << PAGE_SHIFT; + end = (prange->last + 1) << PAGE_SHIFT; + + for (addr = start; addr < end;) { + unsigned long next; + + vma = find_vma(mm, addr); + if (!vma || addr < vma->vm_start) + break; + + next = min(vma->vm_end, end); + r = svm_migrate_vma_to_vram(adev, prange, vma, addr, next); + if (r) { + pr_debug("failed to migrate\n"); + break; + } + addr = next; + } + + if (!r) + prange->actual_loc = best_loc; + + return r; +} + +static void svm_migrate_page_free(struct page *page) +{ + /* Keep this function to avoid warning */ +} + +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) +{ + uint64_t npages = migrate->cpages; + struct device *dev = adev->dev; + uint64_t *src; + dma_addr_t *dst; + struct page *dpage; + uint64_t i = 0, j; + uint64_t addr; + int r = 0; + + pr_debug("svms 0x%p [0x%lx 0x%lx]\n", prange->svms, prange->start, + prange->last); + + addr = prange->start << PAGE_SHIFT; + + src = (uint64_t *)(scratch + npages); + dst = scratch; + + for (i = 0, j = 0; i < npages; i++, j++, addr += PAGE_SIZE) { + struct page *spage; + + spage = migrate_pfn_to_page(migrate->src[i]); + if (!spage) { + pr_debug("failed get spage svms 0x%p [0x%lx 0x%lx]\n", + prange->svms, prange->start, prange->last); + r = -ENOMEM; + goto out_oom; + } + src[i] = svm_migrate_addr(adev, spage); + if (i > 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_FROM_DEVICE); + r = dma_mapping_error(dev, dst[i]); + if (r) { + pr_debug("failed %d dma_map_page\n", r); + goto out_oom; + } + + pr_debug("dma mapping dst to 0x%llx, page_to_pfn 0x%lx\n", + dst[i] >> PAGE_SHIFT, page_to_pfn(dpage)); + + migrate->dst[i] = migrate_pfn(page_to_pfn(dpage)); + migrate->dst[i] |= MIGRATE_PFN_LOCKED; + } + + 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; +} + +static int +svm_migrate_vma_to_ram(struct amdgpu_device *adev, struct svm_range *prange, + struct vm_area_struct *vma, uint64_t start, uint64_t end) +{ + uint64_t npages = (end - start) >> PAGE_SHIFT; + struct dma_fence *mfence = NULL; + struct migrate_vma migrate; + dma_addr_t *scratch; + size_t size; + void *buf; + int r = -ENOMEM; + + memset(&migrate, 0, sizeof(migrate)); + migrate.vma = vma; + migrate.start = start; + migrate.end = end; + migrate.flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; + migrate.pgmap_owner = adev; + + size = 2 * sizeof(*migrate.src) + sizeof(uint64_t) + sizeof(dma_addr_t); + size *= npages; + buf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); + if (!buf) + goto out; + + migrate.src = buf; + migrate.dst = migrate.src + npages; + scratch = (dma_addr_t *)(migrate.dst + npages); + + r = migrate_vma_setup(&migrate); + if (r) { + pr_debug("failed %d prepare migrate svms 0x%p [0x%lx 0x%lx]\n", + r, prange->svms, prange->start, prange->last); + goto out_free; + } + + pr_debug("cpages %ld\n", migrate.cpages); + + if (migrate.cpages) { + r = svm_migrate_copy_to_ram(adev, prange, &migrate, &mfence, + scratch); + migrate_vma_pages(&migrate); + svm_migrate_copy_done(adev, mfence); + migrate_vma_finalize(&migrate); + } else { + pr_debug("failed collect migrate device pages [0x%lx 0x%lx]\n", + prange->start, prange->last); + } + + svm_range_dma_unmap(adev->dev, scratch, 0, npages); + +out_free: + kvfree(buf); +out: + return r; +} + +/** + * svm_migrate_vram_to_ram - migrate svm range from device to system + * @prange: range structure + * @mm: process mm, use current->mm if NULL + * + * Context: Process context, caller hold mmap read lock, svms lock, prange lock + * + * Return: + * 0 - OK, otherwise error code + */ +int svm_migrate_vram_to_ram(struct svm_range *prange, struct mm_struct *mm) +{ + struct amdgpu_device *adev; + struct vm_area_struct *vma; + unsigned long addr; + unsigned long start; + unsigned long end; + int r = 0; + + if (!prange->actual_loc) { + pr_debug("[0x%lx 0x%lx] already migrated to ram\n", + prange->start, prange->last); + return 0; + } + + adev = svm_range_get_adev_by_id(prange, prange->actual_loc); + if (!adev) { + pr_debug("failed to get device 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, prange->start, prange->last, + prange->actual_loc); + + start = prange->start << PAGE_SHIFT; + end = (prange->last + 1) << PAGE_SHIFT; + + for (addr = start; addr < end;) { + unsigned long next; + + vma = find_vma(mm, addr); + if (!vma || addr < vma->vm_start) + break; + + next = min(vma->vm_end, end); + r = svm_migrate_vma_to_ram(adev, prange, vma, addr, next); + if (r) { + pr_debug("failed %d to migrate\n", r); + break; + } + addr = next; + } + + if (!r) { + svm_range_vram_node_free(prange); + prange->actual_loc = 0; + } + return r; +} + +/** + * svm_migrate_vram_to_vram - migrate svm range from device to device + * @prange: range structure + * @best_loc: the device to migrate to + * @mm: process mm, use current->mm if NULL + * + * Context: Process context, caller hold mmap read lock, svms lock, prange lock + * + * Return: + * 0 - OK, otherwise error code + */ +static int +svm_migrate_vram_to_vram(struct svm_range *prange, uint32_t best_loc, + struct mm_struct *mm) +{ + int r; + + /* + * 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); + + r = svm_migrate_vram_to_ram(prange, mm); + if (r) + return r; + + return svm_migrate_ram_to_vram(prange, best_loc, mm); +} + +int +svm_migrate_to_vram(struct svm_range *prange, uint32_t best_loc, + struct mm_struct *mm) +{ + if (!prange->actual_loc) + return svm_migrate_ram_to_vram(prange, best_loc, mm); + else + return svm_migrate_vram_to_vram(prange, best_loc, mm); + +} + +/** + * 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 addr = vmf->address; + struct vm_area_struct *vma; + enum svm_work_list_ops op; + struct svm_range *parent; + struct svm_range *prange; + struct kfd_process *p; + struct mm_struct *mm; + int r = 0; + + vma = vmf->vma; + mm = vma->vm_mm; + + p = kfd_lookup_process_by_mm(vma->vm_mm); + if (!p) { + pr_debug("failed find process at fault address 0x%lx\n", addr); + return VM_FAULT_SIGBUS; + } + addr >>= PAGE_SHIFT; + pr_debug("CPU page fault svms 0x%p address 0x%lx\n", &p->svms, addr); + + mutex_lock(&p->svms.lock); + + prange = svm_range_from_addr(&p->svms, addr, &parent); + if (!prange) { + pr_debug("cannot find svm range at 0x%lx\n", addr); + r = -EFAULT; + goto out; + } + + mutex_lock(&parent->migrate_mutex); + if (prange != parent) + mutex_lock_nested(&prange->migrate_mutex, 1); + + if (!prange->actual_loc) + goto out_unlock_prange; + + svm_range_lock(parent); + if (prange != parent) + mutex_lock_nested(&prange->lock, 1); + r = svm_range_split_by_granularity(p, mm, addr, parent, prange); + if (prange != parent) + mutex_unlock(&prange->lock); + svm_range_unlock(parent); + if (r) { + pr_debug("failed %d to split range by granularity\n", r); + goto out_unlock_prange; + } + + r = svm_migrate_vram_to_ram(prange, mm); + if (r) + pr_debug("failed %d migrate 0x%p [0x%lx 0x%lx] to ram\n", r, + prange, prange->start, prange->last); + + /* xnack on, update mapping on GPUs with ACCESS_IN_PLACE */ + if (p->xnack_enabled && parent == prange) + op = SVM_OP_UPDATE_RANGE_NOTIFIER_AND_MAP; + else + op = SVM_OP_UPDATE_RANGE_NOTIFIER; + svm_range_add_list_work(&p->svms, parent, mm, op); + schedule_deferred_list_work(&p->svms); + +out_unlock_prange: + if (prange != parent) + mutex_unlock(&prange->migrate_mutex); + mutex_unlock(&parent->migrate_mutex); +out: + mutex_unlock(&p->svms.lock); + kfd_unref_process(p); + + pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); + + return r ? VM_FAULT_SIGBUS : 0; +} + +static const struct dev_pagemap_ops svm_migrate_pgmap_ops = { + .page_free = svm_migrate_page_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 svm_migrate_init(struct amdgpu_device *adev) +{ + struct kfd_dev *kfddev = adev->kfd.dev; + struct dev_pagemap *pgmap; + struct resource *res; + unsigned long size; + void *r; + + /* Page migration works on Vega10 or newer */ + if (kfddev->device_info->asic_family < CHIP_VEGA10) + return -EINVAL; + + 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); + res = devm_request_free_mem_region(adev->dev, &iomem_resource, size); + if (IS_ERR(res)) + return -ENOMEM; + + pgmap->type = MEMORY_DEVICE_PRIVATE; + pgmap->nr_range = 1; + pgmap->range.start = res->start; + pgmap->range.end = res->end; + pgmap->ops = &svm_migrate_pgmap_ops; + pgmap->owner = adev; + pgmap->flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE; + r = devm_memremap_pages(adev->dev, pgmap); + if (IS_ERR(r)) { + pr_err("failed to register HMM device memory\n"); + devm_release_mem_region(adev->dev, res->start, + res->end - res->start + 1); + 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; +} + +void svm_migrate_fini(struct amdgpu_device *adev) +{ + struct dev_pagemap *pgmap = &adev->kfd.dev->pgmap; + + devm_memunmap_pages(adev->dev, pgmap); + devm_release_mem_region(adev->dev, pgmap->range.start, + pgmap->range.end - pgmap->range.start + 1); +} |