drm/i915/gvt: Add gvt options sanitize function

The intel_gvt_sanitize_options will sanitize the GVT related
options before doing initialize the GVT.

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/i915_drv.c

@@ -997,6 +997,8 @@ static void intel_sanitize_options(struct drm_i915_private *dev_priv)
 	DRM_DEBUG_DRIVER("use GPU semaphores? %s\n", yesno(i915.semaphores));
 
 	intel_uc_sanitize_options(dev_priv);
+
+	intel_gvt_sanitize_options(dev_priv);
 }
 
 /**

drivers/gpu/drm/i915/intel_gvt.c

@@ -50,6 +50,32 @@ static bool is_supported_device(struct drm_i915_private *dev_priv)
 	return false;
 }
 
+/**
+ * intel_gvt_sanitize_options - sanitize GVT related options
+ * @dev_priv: drm i915 private data
+ *
+ * This function is called at the i915 options sanitize stage.
+ */
+void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
+{
+	if (!i915.enable_gvt)
+		return;
+
+	if (intel_vgpu_active(dev_priv)) {
+		DRM_INFO("GVT-g is disabled for guest\n");
+		goto bail;
+	}
+
+	if (!is_supported_device(dev_priv)) {
+		DRM_INFO("Unsupported device. GVT-g is disabled\n");
+		goto bail;
+	}
+
+	return;
+bail:
+	i915.enable_gvt = 0;
+}
+
 /**
  * intel_gvt_init - initialize GVT components
  * @dev_priv: drm i915 private data
@@ -69,16 +95,6 @@ int intel_gvt_init(struct drm_i915_private *dev_priv)
 		return 0;
 	}
 
-	if (intel_vgpu_active(dev_priv)) {
-		DRM_DEBUG_DRIVER("GVT-g is disabled for guest\n");
-		goto bail;
-	}
-
-	if (!is_supported_device(dev_priv)) {
-		DRM_DEBUG_DRIVER("Unsupported device. GVT-g is disabled\n");
-		goto bail;
-	}
-
 	if (!i915.enable_execlists) {
 		DRM_INFO("GPU guest virtualisation [GVT-g] disabled due to disabled execlist submission [i915.enable_execlists module parameter]\n");
 		goto bail;

drivers/gpu/drm/i915/intel_gvt.h

@@ -32,6 +32,7 @@ void intel_gvt_cleanup(struct drm_i915_private *dev_priv);
 int intel_gvt_init_device(struct drm_i915_private *dev_priv);
 void intel_gvt_clean_device(struct drm_i915_private *dev_priv);
 int intel_gvt_init_host(void);
+void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv);
 #else
 static inline int intel_gvt_init(struct drm_i915_private *dev_priv)
 {
@@ -40,6 +41,10 @@ static inline int intel_gvt_init(struct drm_i915_private *dev_priv)
 static inline void intel_gvt_cleanup(struct drm_i915_private *dev_priv)
 {
 }
+
+static inline void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
+{
+}
 #endif
 
 #endif /* _INTEL_GVT_H_ */