From ecacec0f4aff9130e333e67ecfa21f3e0b630298 Mon Sep 17 00:00:00 2001 From: Matthew Brost Date: Wed, 5 Mar 2025 17:26:50 -0800 Subject: [PATCH] drm/xe: Add Xe SVM populate_devmem_pfn GPU SVM vfunc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Get device pfns from BO's buddy blocks. Used in migrate_* core MM functions called in GPU SVM to migrate between device and system memory. v2: - Use new drm_gpusvm_devmem_ops v3: - Better commit message (Thomas) v5: - s/xe_mem_region/xe_vram_region (Rebase) Signed-off-by: Niranjana Vishwanathapura Signed-off-by: Oak Zeng Signed-off-by: Matthew Brost Reviewed-by: Thomas Hellström Link: https://patchwork.freedesktop.org/patch/msgid/20250306012657.3505757-26-matthew.brost@intel.com --- drivers/gpu/drm/xe/xe_svm.c | 40 +++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c index 3bdd72a4f8ff..e063b7d731c3 100644 --- a/drivers/gpu/drm/xe/xe_svm.c +++ b/drivers/gpu/drm/xe/xe_svm.c @@ -7,6 +7,7 @@ #include "xe_migrate.h" #include "xe_pt.h" #include "xe_svm.h" +#include "xe_ttm_vram_mgr.h" #include "xe_vm.h" #include "xe_vm_types.h" @@ -461,8 +462,47 @@ static int xe_svm_copy_to_ram(struct page **pages, dma_addr_t *dma_addr, return xe_svm_copy(pages, dma_addr, npages, XE_SVM_COPY_TO_SRAM); } +static struct xe_bo *to_xe_bo(struct drm_gpusvm_devmem *devmem_allocation) +{ + return container_of(devmem_allocation, struct xe_bo, devmem_allocation); +} + +static u64 block_offset_to_pfn(struct xe_vram_region *vr, u64 offset) +{ + return PHYS_PFN(offset + vr->hpa_base); +} + +static struct drm_buddy *tile_to_buddy(struct xe_tile *tile) +{ + return &tile->mem.vram.ttm.mm; +} + +static int xe_svm_populate_devmem_pfn(struct drm_gpusvm_devmem *devmem_allocation, + unsigned long npages, unsigned long *pfn) +{ + struct xe_bo *bo = to_xe_bo(devmem_allocation); + struct ttm_resource *res = bo->ttm.resource; + struct list_head *blocks = &to_xe_ttm_vram_mgr_resource(res)->blocks; + struct drm_buddy_block *block; + int j = 0; + + list_for_each_entry(block, blocks, link) { + struct xe_vram_region *vr = block->private; + struct xe_tile *tile = vr_to_tile(vr); + struct drm_buddy *buddy = tile_to_buddy(tile); + u64 block_pfn = block_offset_to_pfn(vr, drm_buddy_block_offset(block)); + int i; + + for (i = 0; i < drm_buddy_block_size(buddy, block) >> PAGE_SHIFT; ++i) + pfn[j++] = block_pfn + i; + } + + return 0; +} + __maybe_unused static const struct drm_gpusvm_devmem_ops gpusvm_devmem_ops = { + .populate_devmem_pfn = xe_svm_populate_devmem_pfn, .copy_to_devmem = xe_svm_copy_to_devmem, .copy_to_ram = xe_svm_copy_to_ram, };