[Intel-gfx] [PATCH v2] drm/i915/guc: add CAT error handler

[Andrzej Hajda]

Bad GPU memory accesses can result in catastrophic error notifications
being send from the GPU to the KMD via the GuC. Add a handler to process
the notification by printing a kernel message and dumping the related
engine state (if appropriate).
Since the same CAT error can be reported twice, log only 1st one and
assume error for the same context reported in less than 100ms after the
1st one is duplicated.

Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>
---
 .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h  |  1 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  2 +
 drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c     |  3 ++
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 47 +++++++++++++++++++
 4 files changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
index f359bef046e0b2..f9a1c5642855e3 100644
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
@@ -138,6 +138,7 @@ enum intel_guc_action {
 	INTEL_GUC_ACTION_REGISTER_CONTEXT_MULTI_LRC = 0x4601,
 	INTEL_GUC_ACTION_CLIENT_SOFT_RESET = 0x5507,
 	INTEL_GUC_ACTION_SET_ENG_UTIL_BUFF = 0x550A,
+	INTEL_GUC_ACTION_NOTIFY_MEMORY_CAT_ERROR = 0x6000,
 	INTEL_GUC_ACTION_STATE_CAPTURE_NOTIFICATION = 0x8002,
 	INTEL_GUC_ACTION_NOTIFY_FLUSH_LOG_BUFFER_TO_FILE = 0x8003,
 	INTEL_GUC_ACTION_NOTIFY_CRASH_DUMP_POSTED = 0x8004,
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 804133df1ac9b4..61b412732d095a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -445,6 +445,8 @@ int intel_guc_engine_failure_process_msg(struct intel_guc *guc,
 					 const u32 *msg, u32 len);
 int intel_guc_error_capture_process_msg(struct intel_guc *guc,
 					const u32 *msg, u32 len);
+int intel_guc_cat_error_process_msg(struct intel_guc *guc,
+				    const u32 *msg, u32 len);
 
 struct intel_engine_cs *
 intel_guc_lookup_engine(struct intel_guc *guc, u8 guc_class, u8 instance);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
index 2b22065e87bf9a..f55f724e264407 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -1035,6 +1035,9 @@ static int ct_process_request(struct intel_guc_ct *ct, struct ct_incoming_msg *r
 		CT_ERROR(ct, "Received GuC exception notification!\n");
 		ret = 0;
 		break;
+	case INTEL_GUC_ACTION_NOTIFY_MEMORY_CAT_ERROR:
+		ret = intel_guc_cat_error_process_msg(guc, payload, len);
+		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 693b07a977893d..f68ae4a0ad864d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -4659,6 +4659,53 @@ int intel_guc_engine_failure_process_msg(struct intel_guc *guc,
 	return 0;
 }
 
+int intel_guc_cat_error_process_msg(struct intel_guc *guc,
+				    const u32 *msg, u32 len)
+{
+	static struct {
+		u32 ctx_id;
+		unsigned long after;
+	} ratelimit;
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	struct drm_printer p = drm_info_printer(i915->drm.dev);
+	struct intel_context *ce;
+	unsigned long flags;
+	u32 ctx_id;
+
+	if (unlikely(len != 1)) {
+		drm_dbg(&i915->drm, "Invalid length %u\n", len);
+		return -EPROTO;
+	}
+	ctx_id = msg[0];
+
+	if (ctx_id == ratelimit.ctx_id && time_is_after_jiffies(ratelimit.after))
+		return 0;
+
+	ratelimit.ctx_id = ctx_id;
+	ratelimit.after = jiffies + msecs_to_jiffies(100);
+
+	if (unlikely(ctx_id == -1)) {
+		drm_err(&i915->drm,
+			"GPU reported catastrophic error without providing valid context\n");
+		return 0;
+	}
+
+	xa_lock_irqsave(&guc->context_lookup, flags);
+	ce = g2h_context_lookup(guc, ctx_id);
+	if (ce)
+		intel_context_get(ce);
+	xa_unlock_irqrestore(&guc->context_lookup, flags);
+	if (unlikely(!ce))
+		return -EPROTO;
+
+	drm_err(&i915->drm, "GPU reported catastrophic error associated with context %u on %s\n",
+		ctx_id, ce->engine->name);
+	intel_engine_dump(ce->engine, &p, "%s\n", ce->engine->name);
+	intel_context_put(ce);
+
+	return 0;
+}
+
 void intel_guc_find_hung_context(struct intel_engine_cs *engine)
 {
 	struct intel_guc *guc = &engine->gt->uc.guc;
-- 
2.34.1