This is a note to let you know that I've just added the patch titled
drm/amdkfd: retry after EBUSY is returned from hmm_ranges_get_pages
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdkfd-retry-after-ebusy-is-returned-from-hmm_ra.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 183cf99a29cb83ef40a35821dc4f08ed1f32864e
Author: Alex Sierra <alex.sierra@xxxxxxx>
Date: Tue Aug 15 15:42:52 2023 -0500
drm/amdkfd: retry after EBUSY is returned from hmm_ranges_get_pages
[ Upstream commit ebac9414a56a5f7c336db5f5c7cc34713b649407 ]
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: Alex Sierra <alex.sierra@xxxxxxx>
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Stable-dep-of: eb3c357bcb28 ("drm/amdkfd: Handle errors from svm validate and map")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index a9b57c66cb7d7..4c1b72194a6f8 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1651,6 +1651,8 @@ 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;
}
