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drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram

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When migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set +
MIGRATE_PFN_VALID unset) driver still allocates device pages. There is no
dma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart()
will return an uninitialized r. That can trigger out_free_vram_pages to drop
all VRAM just set up.

Initialize r and only call the last svm_migrate_copy_memory_gart if j > 0.

Current code postponed the last page to the final copy. This patch flushes on
the last page when reach to the end of current drm_buddy_block; avoids another
svm_migrate_copy_memory_gart.

Cc: stable@vger.kernel.org
Signed-off-by: Xiaogang Chen <xiaogang.chen@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Xiaogang Chen
2026-08-23 15:47:15 -05:00
committed by Alex Deucher
parent 960c4a8069
commit 520e345ffe
1 changed files with 7 additions and 4 deletions
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11
drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
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@@ -134,7 +134,7 @@ svm_migrate_copy_memory_gart(struct amdgpu_device *adev, dma_addr_t *sys,
u64 gart_s, gart_d;
struct dma_fence *next;
u64 size;
int r;
int r = 0;
ring = to_amdgpu_ring(adev->mman.buffer_funcs_scheds[0]);
entity = &adev->mman.move_entities[0];
@@ -284,7 +284,7 @@ svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,
dma_addr_t *src;
u64 *dst;
u64 i, j;
int r;
int r = 0;
pr_debug("svms 0x%p [0x%lx 0x%lx 0x%llx]\n", prange->svms, prange->start,
prange->last, ttm_res_offset);
@@ -310,6 +310,7 @@ svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,
DMA_BIDIRECTIONAL);
r = dma_mapping_error(dev, src[i]);
if (r) {
src[i] = 0;
dev_err(dev, "%s: fail %d dma_map_page\n",
__func__, r);
goto out_free_vram_pages;
@@ -334,7 +335,8 @@ svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,
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) {
/* accumulated j + 1 pages reach end of current drm_buddy_block */
if (j + 1 >= (cursor.size >> PAGE_SHIFT)) {
r = svm_migrate_copy_memory_gart(adev, src + i - j,
dst + i - j, j + 1,
FROM_RAM_TO_VRAM,
@@ -348,7 +350,8 @@ svm_migrate_copy_to_vram(struct kfd_node *node, struct svm_range *prange,
}
}
r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j,
if (j > 0)
r = svm_migrate_copy_memory_gart(adev, src + i - j, dst + i - j, j,
FROM_RAM_TO_VRAM, mfence);
out_free_vram_pages: