drm/i915/hdcp: Move common message filling function to its own file

Create a new file intel_hdcp_gsc_message that contain functions
which fill the hdcp messages we send to gsc cs this refactor will
help us reuse code for Xe later on

--v2
-add the missed file for proper build

--v3
-use forward declarations instead of #includes [Jani]

--v4
-move linux/err.h to intel_hdcp_gsc_message.c from
intel_hdcp_gsc_message.h [Jani]

--v5
-move linux include on top of drm includes [Uma]
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231009095537.653619-3-suraj.kandpal@intel.com

drivers/gpu/drm/i915/Makefile

@@ -279,6 +279,7 @@ i915-y += \
 	display/intel_global_state.o \
 	display/intel_hdcp.o \
 	display/intel_hdcp_gsc.o \
+	display/intel_hdcp_gsc_message.o \
 	display/intel_hotplug.o \
 	display/intel_hotplug_irq.o \
 	display/intel_hti.o \

drivers/gpu/drm/i915/display/intel_hdcp_gsc_message.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#ifndef __INTEL_HDCP_GSC_MESSAGE_H__
+#define __INTEL_HDCP_GSC_MESSAGE_H__
+
+#include <linux/types.h>
+
+struct device;
+struct drm_i915_private;
+struct hdcp_port_data;
+struct hdcp2_ake_init;
+struct hdcp2_ake_send_cert;
+struct hdcp2_ake_no_stored_km;
+struct hdcp2_ake_send_hprime;
+struct hdcp2_ake_send_pairing_info;
+struct hdcp2_lc_init;
+struct hdcp2_lc_send_lprime;
+struct hdcp2_ske_send_eks;
+struct hdcp2_rep_send_receiverid_list;
+struct hdcp2_rep_send_ack;
+struct hdcp2_rep_stream_ready;
+
+ssize_t intel_hdcp_gsc_msg_send(struct drm_i915_private *i915, u8 *msg_in,
+				size_t msg_in_len, u8 *msg_out,
+				size_t msg_out_len);
+bool intel_hdcp_gsc_check_status(struct drm_i915_private *i915);
+int
+intel_hdcp_gsc_initiate_session(struct device *dev, struct hdcp_port_data *data,
+				struct hdcp2_ake_init *ake_data);
+int
+intel_hdcp_gsc_verify_receiver_cert_prepare_km(struct device *dev,
+					       struct hdcp_port_data *data,
+					       struct hdcp2_ake_send_cert *rx_cert,
+					       bool *km_stored,
+					       struct hdcp2_ake_no_stored_km
+					       *ek_pub_km,
+					       size_t *msg_sz);
+int
+intel_hdcp_gsc_verify_hprime(struct device *dev, struct hdcp_port_data *data,
+			     struct hdcp2_ake_send_hprime *rx_hprime);
+int
+intel_hdcp_gsc_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
+				  struct hdcp2_ake_send_pairing_info *pairing_info);
+int
+intel_hdcp_gsc_initiate_locality_check(struct device *dev,
+				       struct hdcp_port_data *data,
+				       struct hdcp2_lc_init *lc_init_data);
+int
+intel_hdcp_gsc_verify_lprime(struct device *dev, struct hdcp_port_data *data,
+			     struct hdcp2_lc_send_lprime *rx_lprime);
+int intel_hdcp_gsc_get_session_key(struct device *dev,
+				   struct hdcp_port_data *data,
+				   struct hdcp2_ske_send_eks *ske_data);
+int
+intel_hdcp_gsc_repeater_check_flow_prepare_ack(struct device *dev,
+					       struct hdcp_port_data *data,
+					       struct hdcp2_rep_send_receiverid_list
+					       *rep_topology,
+					       struct hdcp2_rep_send_ack
+					       *rep_send_ack);
+int intel_hdcp_gsc_verify_mprime(struct device *dev,
+				 struct hdcp_port_data *data,
+				 struct hdcp2_rep_stream_ready *stream_ready);
+int intel_hdcp_gsc_enable_authentication(struct device *dev,
+					 struct hdcp_port_data *data);
+int
+intel_hdcp_gsc_close_session(struct device *dev, struct hdcp_port_data *data);
+
+#endif /* __INTEL_HDCP_GSC_MESSAGE_H__ */