[PATCH v2 4/4] drm/xe/guc: Don't treat GuC generic CAT error as protocol error

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

GuC uses GUC_ID_UNKNOWN if it can not map the CAT fault to any
context. We shouldn't treat that as G2H protocol error that would
justify a GT reset, as it may happen due to some VF activity.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
---
v2: replaced 16b GUC_ID_MAX with 32b GUC_ID_UNKNOWN
---
 drivers/gpu/drm/xe/xe_guc_fwif.h   | 1 +
 drivers/gpu/drm/xe/xe_guc_submit.c | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_fwif.h b/drivers/gpu/drm/xe/xe_guc_fwif.h
index 08ffe59f22fa..057153f89b30 100644
--- a/drivers/gpu/drm/xe/xe_guc_fwif.h
+++ b/drivers/gpu/drm/xe/xe_guc_fwif.h
@@ -17,6 +17,7 @@
 #define G2H_LEN_DW_TLB_INVALIDATE		3
 
 #define GUC_ID_MAX			65535
+#define GUC_ID_UNKNOWN			0xffffffff
 
 #define GUC_CONTEXT_DISABLE		0
 #define GUC_CONTEXT_ENABLE		1
diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index 147000fd1177..614110dbb527 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -2023,6 +2023,15 @@ int xe_guc_exec_queue_memory_cat_error_handler(struct xe_guc *guc, u32 *msg,
 
 	guc_id = msg[0];
 
+	if (guc_id == GUC_ID_UNKNOWN) {
+		/*
+		 * GuC uses GUC_ID_UNKNOWN if it can not map the CAT fault to any PF/VF
+		 * context. In such case only PF will be notified about that fault.
+		 */
+		xe_gt_err_ratelimited(gt, "Memory CAT error reported by GuC!\n");
+		return 0;
+	}
+
 	q = g2h_exec_queue_lookup(guc, guc_id);
 	if (unlikely(!q))
 		return -EPROTO;
-- 
2.43.0