From: Matthew Brost <matthew.brost@intel.com>
Date: Wed, 8 Oct 2025 21:45:18 +0000 (-0700)
Subject: drm/xe/vf: Flush and stop CTs in VF post migration recovery
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3061e8e0dd6dcabca9c1440abdf1f6ac3fe6bc74;p=thirdparty%2Fkernel%2Flinux.git

drm/xe/vf: Flush and stop CTs in VF post migration recovery

Flushing CTs (i.e., progressing all pending G2H messages) gives VF
post-migration recovery an accurate view of which H2G messages the GuC
has processed, enabling the GuC submission state machine to correctly
rebuild all state.

Also, stop all CT traffic, as the CT is not live during VF
post-migration recovery.

v3:
 - xe_guc_ct_flush_and_stop rename (Michal)
 - Drop extra GuC CT WQ wake up (Michal)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20251008214532.3442967-21-matthew.brost@intel.com
---

diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
index b851285b8756c..e6f6a5c8ef1b7 100644
--- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
+++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c
@@ -1105,6 +1105,7 @@ static void vf_post_migration_shutdown(struct xe_gt *gt)
 	gt->sriov.vf.migration.recovery_queued = false;
 	spin_unlock_irq(&gt->sriov.vf.migration.lock);
 
+	xe_guc_ct_flush_and_stop(&gt->uc.guc.ct);
 	xe_guc_submit_pause(&gt->uc.guc);
 }
 
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index f63ce0cec3575..fd23856359626 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -574,6 +574,16 @@ void xe_guc_ct_disable(struct xe_guc_ct *ct)
 	stop_g2h_handler(ct);
 }
 
+/**
+ * xe_guc_ct_flush_and_stop - Flush and stop all processing of G2H / H2G
+ * @ct: the &xe_guc_ct
+ */
+void xe_guc_ct_flush_and_stop(struct xe_guc_ct *ct)
+{
+	receive_g2h(ct);
+	xe_guc_ct_stop(ct);
+}
+
 /**
  * xe_guc_ct_stop - Set GuC to stopped state
  * @ct: the &xe_guc_ct
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h
index ae49364f6f287..f8370fa4727f8 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.h
+++ b/drivers/gpu/drm/xe/xe_guc_ct.h
@@ -17,6 +17,7 @@ int xe_guc_ct_init_post_hwconfig(struct xe_guc_ct *ct);
 int xe_guc_ct_enable(struct xe_guc_ct *ct);
 void xe_guc_ct_disable(struct xe_guc_ct *ct);
 void xe_guc_ct_stop(struct xe_guc_ct *ct);
+void xe_guc_ct_flush_and_stop(struct xe_guc_ct *ct);
 void xe_guc_ct_fast_path(struct xe_guc_ct *ct);
 
 struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct);