[Intel-gfx] [PATCH v4 11/13] drm/i915/guc: Handle default action received over CT

[Michal Wajdeczko]

When running on platform with CTB based GuC communication enabled,
GuC to Host event data will be delivered as CT request message.
However, content of the data[1] of this CT message follows format
of the scratch register used in MMIO based communication, so some
code reuse is still possible.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/intel_guc.c    | 5 +++++
 drivers/gpu/drm/i915/intel_guc.h    | 1 +
 drivers/gpu/drm/i915/intel_guc_ct.c | 9 +++++++++
 3 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 118db81..b6d2778 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -416,6 +416,11 @@ void intel_guc_to_host_event_handler_mmio(struct intel_guc *guc)
 	I915_WRITE(SOFT_SCRATCH(15), val & ~msg);
 	spin_unlock(&guc->irq_lock);
 
+	intel_guc_to_host_process_recv_msg(guc, msg);
+}
+
+void intel_guc_to_host_process_recv_msg(struct intel_guc *guc, u32 msg)
+{
 	if (msg & (INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER |
 		   INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED))
 		intel_guc_log_handle_flush_event(&guc->log);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 6dc109a..f1265e1 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -163,6 +163,7 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
 void intel_guc_to_host_event_handler(struct intel_guc *guc);
 void intel_guc_to_host_event_handler_nop(struct intel_guc *guc);
 void intel_guc_to_host_event_handler_mmio(struct intel_guc *guc);
+void intel_guc_to_host_process_recv_msg(struct intel_guc *guc, u32 msg);
 int intel_guc_sample_forcewake(struct intel_guc *guc);
 int intel_guc_auth_huc(struct intel_guc *guc, u32 rsa_offset);
 int intel_guc_suspend(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/intel_guc_ct.c b/drivers/gpu/drm/i915/intel_guc_ct.c
index 90aff51..9bc8738 100644
--- a/drivers/gpu/drm/i915/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/intel_guc_ct.c
@@ -644,8 +644,17 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg)
 static void ct_dispatch_request(struct intel_guc_ct *ct,
 				u32 action, u32 len, const u32 *payload)
 {
+	struct intel_guc *guc = ct_to_guc(ct);
+
 	switch (action) {
+	case INTEL_GUC_ACTION_DEFAULT:
+		if (unlikely(len < 1))
+			goto fail_unexpected;
+		intel_guc_to_host_process_recv_msg(guc, *payload);
+		break;
+
 	default:
+fail_unexpected:
 		DRM_ERROR("CT: unexpected request %x %*phn\n",
 			  action, 4*len, payload);
 		break;
-- 
1.9.1