[PATCH 07/15] drm/i915/guc: Create a GuC receive function

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

From: Oscar Mateo <oscar.mateo@intel.com>

This function, symmetrical to the send(), will handle Guc2Host message
interrupts (which at the moment still only covers requests to flush
the GuC logs).

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/intel_uc.c | 18 +++++++++++++++++-
 drivers/gpu/drm/i915/intel_uc.h |  5 +++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index a091e83..258e0d0 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -109,6 +109,7 @@ void intel_uc_init_early(struct drm_i915_private *dev_priv)
 
 	mutex_init(&guc->send_mutex);
 	guc->send = intel_guc_send_nop;
+	guc->recv = intel_guc_receive_nop;
 	guc->notify = guc_write_irq_trigger;
 }
 
@@ -315,6 +316,7 @@ static int guc_enable_communication(struct intel_guc *guc)
 		return intel_guc_enable_ct(guc);
 
 	guc->send = intel_guc_send_mmio;
+	guc->recv = intel_guc_receive_mmio;
 	return 0;
 }
 
@@ -326,6 +328,7 @@ static void guc_disable_communication(struct intel_guc *guc)
 		intel_guc_disable_ct(guc);
 
 	guc->send = intel_guc_send_nop;
+	guc->recv = intel_guc_receive_nop;
 }
 
 int intel_uc_init_hw(struct drm_i915_private *dev_priv)
@@ -466,6 +469,11 @@ int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len,
 	return -ENODEV;
 }
 
+void intel_guc_receive_nop(struct intel_guc *guc)
+{
+	WARN(1, "Unexpected receive\n");
+}
+
 /*
  * This function implements the MMIO based host to GuC interface.
  */
@@ -532,7 +540,10 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
 	return ret;
 }
 
-void intel_guc_notification_handler(struct intel_guc *guc)
+/*
+ * This function implements the MMIO based GuC to host interface.
+ */
+void intel_guc_receive_mmio(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	u32 msg, flush;
@@ -565,6 +576,11 @@ void intel_guc_notification_handler(struct intel_guc *guc)
 	}
 }
 
+void intel_guc_notification_handler(struct intel_guc *guc)
+{
+	guc->recv(guc);
+}
+
 int intel_guc_sample_forcewake(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 4808f47..6f20e66 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -208,6 +208,9 @@ struct intel_guc {
 	/* GuC's FW specific send function */
 	int (*send)(struct intel_guc *guc, const u32 *data, u32 len, u32 *resp);
 
+	/* GuC's FW specific receive function */
+	void (*recv)(struct intel_guc *guc);
+
 	/* GuC's FW specific notify function */
 	void (*notify)(struct intel_guc *guc);
 };
@@ -230,6 +233,8 @@ void intel_guc_notification_handler(struct intel_guc *guc);
 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);
+void intel_guc_receive_nop(struct intel_guc *guc);
+void intel_guc_receive_mmio(struct intel_guc *guc);
 
 static inline int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len)
 {
-- 
2.7.4

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