[PATCH v4 05/13] drm/i915/guc: Make event handler a virtual function

[Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>]

On platforms with CTB based GuC communications, we will handle
GuC events in a different way. Let's make event handler a virtual
function to allow easy switch between those variants.

Credits-to: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_guc.c |  8 +++++++-
 drivers/gpu/drm/i915/intel_guc.h | 10 ++++++++++
 drivers/gpu/drm/i915/intel_uc.c  |  2 ++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 9ce01e5..118db81 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -69,6 +69,7 @@ void intel_guc_init_early(struct intel_guc *guc)
 	mutex_init(&guc->send_mutex);
 	spin_lock_init(&guc->irq_lock);
 	guc->send = intel_guc_send_nop;
+	guc->handler = intel_guc_to_host_event_handler_nop;
 	guc->notify = gen8_guc_raise_irq;
 }
 
@@ -317,6 +318,11 @@ int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len,
 	return -ENODEV;
 }
 
+void intel_guc_to_host_event_handler_nop(struct intel_guc *guc)
+{
+	WARN(1, "Unexpected event: no suitable handler\n");
+}
+
 /*
  * This function implements the MMIO based host to GuC interface.
  */
@@ -388,7 +394,7 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
 	return ret;
 }
 
-void intel_guc_to_host_event_handler(struct intel_guc *guc)
+void intel_guc_to_host_event_handler_mmio(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	u32 msg, val;
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 7ee0732..6dc109a 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -91,6 +91,9 @@ struct intel_guc {
 	int (*send)(struct intel_guc *guc, const u32 *data, u32 len,
 		    u32 *response_buf, u32 response_buf_size);
 
+	/* GuC's FW specific event handler function */
+	void (*handler)(struct intel_guc *guc);
+
 	/* GuC's FW specific notify function */
 	void (*notify)(struct intel_guc *guc);
 };
@@ -113,6 +116,11 @@ static inline void intel_guc_notify(struct intel_guc *guc)
 	guc->notify(guc);
 }
 
+static inline void intel_guc_to_host_event_handler(struct intel_guc *guc)
+{
+	guc->handler(guc);
+}
+
 /* GuC addresses above GUC_GGTT_TOP also don't map through the GTT */
 #define GUC_GGTT_TOP	0xFEE00000
 
@@ -153,6 +161,8 @@ int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len,
 int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len,
 			u32 *response_buf, u32 response_buf_size);
 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);
 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_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 34f8a2c..8dc6a9c 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -234,6 +234,7 @@ static int guc_enable_communication(struct intel_guc *guc)
 		return intel_guc_ct_enable(&guc->ct);
 
 	guc->send = intel_guc_send_mmio;
+	guc->handler = intel_guc_to_host_event_handler_mmio;
 	return 0;
 }
 
@@ -247,6 +248,7 @@ static void guc_disable_communication(struct intel_guc *guc)
 	gen9_disable_guc_interrupts(dev_priv);
 
 	guc->send = intel_guc_send_nop;
+	guc->handler = intel_guc_to_host_event_handler_nop;
 }
 
 int intel_uc_init_misc(struct drm_i915_private *dev_priv)
-- 
1.9.1

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