Commit ebac9414 authored by Alex Sierra's avatar Alex Sierra Committed by Alex Deucher
Browse files

drm/amdkfd: retry after EBUSY is returned from hmm_ranges_get_pages 



if hmm_range_get_pages returns EBUSY error during
svm_range_validate_and_map, within the context of a page fault
interrupt. This should retry through svm_range_restore_pages
callback. Therefore we treat this as EAGAIN error instead, and defer
it to restore pages fallback.

Signed-off-by: default avatarAlex Sierra <alex.sierra@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 00481158

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

+2 −0
Original line number Diff line number Diff line
@@ -1686,6 +1686,8 @@ static int svm_range_validate_and_map(struct mm_struct *mm, 
		WRITE_ONCE(p->svms.faulting_task, NULL);

		if (r) {

			pr_debug("failed %d to get svm range pages\n", r);

			if (r == -EBUSY)

				r = -EAGAIN;

			goto unreserve_out;

		}