ACK: [SRU][P/Q][PATCH 0/1] Fix GT0: Engine reset when suspend on Intel LNL

[Wei-Lin Chang]

On Mon, Jun 16, 2025 at 03:13:41PM +0800, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/2114697
> 
> [Impact]
> When stress s2idle on Lenovo ThinkPad Intel LNL,
> sometimes the system encountered error:
> xe 0000:00:02.0: [drm] GT0: Engine reset: engine_class=bcs, logical_mask: 0x2, guc_id=0
> xe 0000:00:02.0: [drm] GT0: Timedout job: seqno=220338, lrc_seqno=220338, guc_id=0, flags=0x13 in no process [-1]
> If execute suspend again the system will hang.
> 
> [Fix]
> To prevent this try to call xe_sched_stop() to forcefully remove
> anything on the pending_list that has already signalled, before we
> re-submit.
> 
> [Test]
> Tested on 3 platforms Intel LNL, suspend 90 times OK by:
> $ sudo fwts s3 --s3-multiple=90
> After it finished, no related error in log and the display OK.
> 
> [Where problems could occur]
> It make break Intel XE driver.
> 
> Intel LNL is supported from oem-6.11 which is EOL,
> so SRU for 6.14+ kernel versions.
> 
> Matthew Auld (1):
>   drm/xe/sched: stop re-submitting signalled jobs
> 
>  drivers/gpu/drm/xe/xe_gpu_scheduler.h | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> -- 
> 2.43.0
> 
> 
> -- 
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Acked-by: Wei-Lin Chang <weilin.chang at canonical.com>