From: Donet Tom Date: Mon, 12 Jan 2026 14:06:56 +0000 (+0530) Subject: drm/amdkfd: Fix GART PTE for non-4K pagesize in svm_migrate_gart_map() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c160001661b6c4e20f5c31909c722741e14c2d8;p=thirdparty%2Fkernel%2Flinux.git drm/amdkfd: Fix GART PTE for non-4K pagesize in svm_migrate_gart_map() In svm_migrate_gart_map(), while migrating GART mapping, the number of bytes copied for the GART table only accounts for CPU pages. On non-4K systems, each CPU page can contain multiple GPU pages, and the GART requires one 8-byte PTE per GPU page. As a result, an incorrect size was passed to the DMA, causing only a partial update of the GART table. Fix this function to work correctly on non-4K page-size systems by accounting for the number of GPU pages per CPU page when calculating the number of bytes to be copied. Acked-by: Christian König Reviewed-by: Philip Yang Signed-off-by: Ritesh Harjani (IBM) Signed-off-by: Donet Tom Signed-off-by: Felix Kuehling Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c index 4e0629cbd7f8..3df2bbd935e2 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -63,7 +63,7 @@ svm_migrate_gart_map(struct amdgpu_ring *ring, *gart_addr = adev->gmc.gart_start; num_dw = ALIGN(adev->mman.buffer_funcs->copy_num_dw, 8); - num_bytes = npages * 8; + num_bytes = npages * 8 * AMDGPU_GPU_PAGES_IN_CPU_PAGE; r = amdgpu_job_alloc_with_ib(adev, &entity->base, AMDGPU_FENCE_OWNER_UNDEFINED,