[Intel-gfx] [PATCH v2 13/16] drm/i915/guc: Handle default action received over CT

[Michal Wajdeczko]

With enabled CT, instead of programming SCRATCH 15 register with the
Guc to host message, Guc will send us unsolicited CT message.
Content of the first payload dword of this request has the same
format as data expected in the above scratch register.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_ct.c | 3 +++
 drivers/gpu/drm/i915/intel_uc.c     | 7 +++++++
 drivers/gpu/drm/i915/intel_uc.h     | 1 +
 3 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_guc_ct.c b/drivers/gpu/drm/i915/intel_guc_ct.c
index abf2bd8..e6912be 100644
--- a/drivers/gpu/drm/i915/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/intel_guc_ct.c
@@ -664,6 +664,9 @@ static bool guc_process_incoming_requests(struct intel_guc *guc)
 	len = ct_header_get_len(header) + 1; /* also count header dw */
 
 	switch (action) {
+	case INTEL_GUC_ACTION_DEFAULT:
+		intel_guc_process_default_action(guc, request->data[1]);
+		break;
 	default:
 		DRM_ERROR("CT: unexpected request %*phn\n",
 			  4*len, request->data);
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 2590769..774d740 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -597,3 +597,10 @@ int intel_guc_sample_forcewake(struct intel_guc *guc)
 
 	return intel_guc_send(guc, action, ARRAY_SIZE(action));
 }
+
+void intel_guc_process_default_action(struct intel_guc *guc, u32 msg)
+{
+	if (msg & (INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED |
+		   INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER))
+		intel_guc_log_flush(guc);
+}
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 445bca3..478df86 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -230,6 +230,7 @@ void intel_uc_fini_fw(struct drm_i915_private *dev_priv);
 int intel_uc_init_hw(struct drm_i915_private *dev_priv);
 void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
 void intel_guc_notification_handler(struct intel_guc *guc);
+void intel_guc_process_default_action(struct intel_guc *guc, u32 msg);
 int intel_guc_sample_forcewake(struct intel_guc *guc);
 int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len, u32 *response);
 int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len, u32 *response);
-- 
2.7.4