drm/xe/vf: Don't allow GT reset to be queued during VF post migration recovery

With well-behaved software, a GT reset should never occur, nor should it
happen during VF post-migration recovery. If it does, trigger a warning
but suppress the GT reset, as VF post-migration recovery is expected to
bring the VF back to a working state.

v3:
 - Better commit message (Tomasz)
v5:
 - Use xe_gt_WARN_ON (Michal)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Tomasz Lis <tomasz.lis@intel.com>
Link: https://lore.kernel.org/r/20251008214532.3442967-17-matthew.brost@intel.com

1 files changed, 5 insertions, 37 deletions

diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index d123bdb63369..59371b7cc8a4 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -27,6 +27,7 @@
 #include "xe_gt.h"
 #include "xe_gt_clock.h"
 #include "xe_gt_printk.h"
+#include "xe_gt_sriov_vf.h"
 #include "xe_guc.h"
 #include "xe_guc_capture.h"
 #include "xe_guc_ct.h"
@@ -1900,47 +1901,14 @@ static void guc_exec_queue_stop(struct xe_guc *guc, struct xe_exec_queue *q)
 	}
 }
 
-/**
- * xe_guc_submit_reset_block - Disallow reset calls on given GuC.
- * @guc: the &xe_guc struct instance
- */
-int xe_guc_submit_reset_block(struct xe_guc *guc)
-{
-	return atomic_fetch_or(1, &guc->submission_state.reset_blocked);
-}
-
-/**
- * xe_guc_submit_reset_unblock - Allow back reset calls on given GuC.
- * @guc: the &xe_guc struct instance
- */
-void xe_guc_submit_reset_unblock(struct xe_guc *guc)
-{
-	atomic_set_release(&guc->submission_state.reset_blocked, 0);
-	wake_up_all(&guc->ct.wq);
-}
-
-static int guc_submit_reset_is_blocked(struct xe_guc *guc)
-{
-	return atomic_read_acquire(&guc->submission_state.reset_blocked);
-}
-
-/* Maximum time of blocking reset */
-#define RESET_BLOCK_PERIOD_MAX (HZ * 5)
-
-/**
- * xe_guc_wait_reset_unblock - Wait until reset blocking flag is lifted, or timeout.
- * @guc: the &xe_guc struct instance
- */
-int xe_guc_wait_reset_unblock(struct xe_guc *guc)
-{
-	return wait_event_timeout(guc->ct.wq,
-				  !guc_submit_reset_is_blocked(guc), RESET_BLOCK_PERIOD_MAX);
-}
-
 int xe_guc_submit_reset_prepare(struct xe_guc *guc)
 {
 	int ret;
 
+	if (xe_gt_WARN_ON(guc_to_gt(guc),
+			  xe_gt_sriov_vf_recovery_pending(guc_to_gt(guc))))
+		return 0;
+
 	if (!guc->submission_state.initialized)
 		return 0;