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On 11-10-2024 04:36, Matthew Brost wrote: > On Wed, Oct 09, 2024 at 12:43:36PM -0700, John Harrison wrote: >> On 10/9/2024 03:56, Badal Nilawar wrote: >>> Occasionally, the G2H worker starts running after a delay of more than >>> a second even after being queued and activated by the Linux workqueue >>> subsystem. >>> To prevent G2H timeout errors, the wait timeout is being increased. >>> >>> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/1620 >>> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/issues/2902 >>> Signed-off-by: Badal Nilawar >>> Cc: Matthew Brost >>> Cc: Matthew Auld >>> Cc: John Harrison >>> --- >>> drivers/gpu/drm/xe/xe_guc_ct.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c >>> index b93b2821e4e8..dcc95c01b6f0 100644 >>> --- a/drivers/gpu/drm/xe/xe_guc_ct.c >>> +++ b/drivers/gpu/drm/xe/xe_guc_ct.c >>> @@ -1019,7 +1019,7 @@ static int guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len, >>> return ret; >>> } >>> - ret = wait_event_timeout(ct->g2h_fence_wq, g2h_fence.done, HZ); >>> + ret = wait_event_timeout(ct->g2h_fence_wq, g2h_fence.done, HZ * 3); >> Is this change intended to be temporary until the fundamental scheduling >> issue with the workqueue is fixed? If so, there should be a TODO comment to >> that effect so that we remember to shrink the timeout back down again later. >> Three seconds seems like a long time to wait. >> > > I fine with this W/A until we root cause the work queue scheduling issue > but agree this needs a comment explaining why this large timeout is > needed (work queue scheduling issue), how to trigger the larger timeout > (tests which can trigger this), and saying once we root cause issue > reduce the timeout. Sure, I will add the comment here and in patch 3 to explain why this is needed and change need to be reverted once this is fixed. Regards, Badal > > Matt > >> John. >> >>> /* >>> * It is possible that the g2h request may be cancelled while waiting for a response due >>