drm/i915/mtl: Define GSC Proxy component interface

GSC Proxy component is used for communication between the
Intel graphics driver and MEI driver.

Cc: Alan Previn <[e-mail]>
Signed-off-by: Alexander Usyskin <[e-mail]>
Signed-off-by: Tomas Winkler <[e-mail]>
Signed-off-by: Daniele Ceraolo Spurio <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Reviewed-by: Alan Previn <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/drm/i915_component.h

···
 enum i915_component_type {
 	I915_COMPONENT_AUDIO = 1,
 	I915_COMPONENT_HDCP,
-	I915_COMPONENT_PXP
+	I915_COMPONENT_PXP,
+	I915_COMPONENT_GSC_PROXY,
 };
 
 /* MAX_PORT is the number of port

include/drm/i915_gsc_proxy_mei_interface.h

···
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright (c) 2022-2023 Intel Corporation
+ */
+
+#ifndef _I915_GSC_PROXY_MEI_INTERFACE_H_
+#define _I915_GSC_PROXY_MEI_INTERFACE_H_
+
+#include <linux/types.h>
+
+struct device;
+struct module;
+
+/**
+ * struct i915_gsc_proxy_component_ops - ops for GSC Proxy services.
+ * @owner: Module providing the ops
+ * @send: sends a proxy message from GSC FW to ME FW
+ * @recv: receives a proxy message for GSC FW from ME FW
+ */
+struct i915_gsc_proxy_component_ops {
+	struct module *owner;
+
+	/**
+	 * send - Sends a proxy message to ME FW.
+	 * @dev: device struct corresponding to the mei device
+	 * @buf: message buffer to send
+	 * @size: size of the message
+	 * Return: bytes sent on success, negative errno value on failure
+	 */
+	int (*send)(struct device *dev, const void *buf, size_t size);
+
+	/**
+	 * recv - Receives a proxy message from ME FW.
+	 * @dev: device struct corresponding to the mei device
+	 * @buf: message buffer to contain the received message
+	 * @size: size of the buffer
+	 * Return: bytes received on success, negative errno value on failure
+	 */
+	int (*recv)(struct device *dev, void *buf, size_t size);
+};
+
+/**
+ * struct i915_gsc_proxy_component - Used for communication between i915 and
+ * MEI drivers for GSC proxy services
+ * @mei_dev: device that provide the GSC proxy service.
+ * @ops: Ops implemented by GSC proxy driver, used by i915 driver.
+ */
+struct i915_gsc_proxy_component {
+	struct device *mei_dev;
+	const struct i915_gsc_proxy_component_ops *ops;
+};
+
+#endif /* _I915_GSC_PROXY_MEI_INTERFACE_H_ */