The patch below does not apply to the 6.11-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.11.y git checkout FETCH_HEAD git cherry-pick -x 55e8a3f37e54eb1c7b914d6d5565a37282ec1978 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024110922-submitter-street-a3f8@gregkh' --subject-prefix 'PATCH 6.11.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 55e8a3f37e54eb1c7b914d6d5565a37282ec1978 Mon Sep 17 00:00:00 2001 From: Nirmoy Das nirmoy.das@intel.com Date: Tue, 29 Oct 2024 13:01:15 +0100 Subject: [PATCH] drm/xe: Move LNL scheduling WA to xe_device.h

Move LNL scheduling WA to xe_device.h so this can be used in other places without needing keep the same comment about removal of this WA in the future. The WA, which flushes work or workqueues, is now wrapped in macros and can be reused wherever needed.

Cc: Badal Nilawar badal.nilawar@intel.com Cc: Matthew Auld matthew.auld@intel.com Cc: Matthew Brost matthew.brost@intel.com Cc: Himal Prasad Ghimiray himal.prasad.ghimiray@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com cc: stable@vger.kernel.org # v6.11+ Suggested-by: John Harrison John.C.Harrison@Intel.com Signed-off-by: Nirmoy Das nirmoy.das@intel.com Reviewed-by: Matthew Auld matthew.auld@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20241029120117.449694-1-nirmoy... Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com (cherry picked from commit cbe006a6492c01a0058912ae15d473f4c149896c) Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/xe/xe_device.h b/drivers/gpu/drm/xe/xe_device.h index 894f04770454..34620ef855c0 100644 --- a/drivers/gpu/drm/xe/xe_device.h +++ b/drivers/gpu/drm/xe/xe_device.h @@ -178,4 +178,18 @@ void xe_device_declare_wedged(struct xe_device *xe); struct xe_file *xe_file_get(struct xe_file *xef); void xe_file_put(struct xe_file *xef);

+/* + * Occasionally it is seen that the G2H worker starts running after a delay of more than + * a second even after being queued and activated by the Linux workqueue subsystem. This + * leads to G2H timeout error. The root cause of issue lies with scheduling latency of + * Lunarlake Hybrid CPU. Issue disappears if we disable Lunarlake atom cores from BIOS + * and this is beyond xe kmd. + * + * TODO: Drop this change once workqueue scheduling delay issue is fixed on LNL Hybrid CPU. + */ +#define LNL_FLUSH_WORKQUEUE(wq__) \ + flush_workqueue(wq__) +#define LNL_FLUSH_WORK(wrk__) \ + flush_work(wrk__) + #endif diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c index 17986bfd8818..9c505d3517cd 100644 --- a/drivers/gpu/drm/xe/xe_guc_ct.c +++ b/drivers/gpu/drm/xe/xe_guc_ct.c @@ -897,17 +897,8 @@ static int guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len,

ret = wait_event_timeout(ct->g2h_fence_wq, g2h_fence.done, HZ);

- /* - * Occasionally it is seen that the G2H worker starts running after a delay of more than - * a second even after being queued and activated by the Linux workqueue subsystem. This - * leads to G2H timeout error. The root cause of issue lies with scheduling latency of - * Lunarlake Hybrid CPU. Issue dissappears if we disable Lunarlake atom cores from BIOS - * and this is beyond xe kmd. - * - * TODO: Drop this change once workqueue scheduling delay issue is fixed on LNL Hybrid CPU. - */ if (!ret) { - flush_work(&ct->g2h_worker); + LNL_FLUSH_WORK(&ct->g2h_worker); if (g2h_fence.done) { xe_gt_warn(gt, "G2H fence %u, action %04x, done\n", g2h_fence.seqno, action[0]);