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drm/amdkfd: skip migration for pages already in VRAM

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Migration skipped for pages that are already in VRAM
domain. These could be the result of previous partial
migrations to SYS RAM, and prefetch back to VRAM.
Ex. Coherent pages in VRAM that were not written/invalidated after
a copy-on-write.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Sierra 2021-06-30 15:09:10 -04:00 • committed by Alex Deucher
parent 1ade5f84cc
commit 6ffecc946f
1 changed files with 7 additions and 9 deletions
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16
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
View file

@ -293,15 +293,13 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
for (i = j = 0; i < npages; i++) {
struct page *spage;
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]);
migrate->dst[i] |= MIGRATE_PFN_LOCKED;
if (migrate->src[i] & MIGRATE_PFN_VALID) {
spage = migrate_pfn_to_page(migrate->src[i]);
spage = migrate_pfn_to_page(migrate->src[i]);
if (spage && !is_zone_device_page(spage)) {
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]);
migrate->dst[i] |= MIGRATE_PFN_LOCKED;
src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE,
DMA_TO_DEVICE);
r = dma_mapping_error(dev, src[i]);