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drm/amdkfd: retry after EBUSY is returned from hmm_ranges_get_pages

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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@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 2023-08-15 15:42:52 -05:00 committed by Alex Deucher
parent bae44a8fcb
commit 3aca8cca60
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
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@ -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;
}