[PATCH 13/13] drm/i915/mtl: Add HDCP GSC interface

Suraj Kandpal suraj.kandpal at intel.com
Mon Dec 5 08:41:47 UTC 2022


MTL uses GSC command streamer i.e gsc cs to send HDCP/PXP commands
to GSC f/w. It requires to keep hdcp display driver
agnostic to content protection f/w (ME/GSC fw) in the form of
i915_hdcp_fw_ops generic ops.

Adding HDCP GSC CS interface by leveraging the i915_hdcp_fw_ops generic
ops instead of I915_HDCP_COMPONENT as integral part of i915.

Adding checks to see if GSC is loaded and proxy is setup

Cc: Tomas Winkler <tomas.winkler at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Uma Shankar <uma.shankar at intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c     |  28 +-
 drivers/gpu/drm/i915/display/intel_hdcp_gsc.c | 503 +++++++++++++++++-
 2 files changed, 524 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index e856b10948ab..efdaa938df48 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -25,6 +25,8 @@
 #include "intel_hdcp.h"
 #include "intel_hdcp_regs.h"
 #include "intel_pcode.h"
+#include "intel_connector.h"
+#include "display/intel_hdcp_gsc.h"
 
 #define KEY_LOAD_TRIES	5
 #define HDCP2_LC_RETRY_CNT			3
@@ -203,13 +205,20 @@ bool intel_hdcp2_capable(struct intel_connector *connector)
 	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_hdcp *hdcp = &connector->hdcp;
+	struct intel_gt *gt = dev_priv->media_gt;
+	struct intel_gsc_uc *gsc = &gt->uc.gsc;
 	bool capable = false;
 
 	/* I915 support for HDCP2.2 */
 	if (!hdcp->hdcp2_supported)
 		return false;
 
-	/* MEI interface is solid */
+	/* If MTL+ make sure gsc is loaded and proxy is setup */
+	if (DISPLAY_VER(dev_priv) >= 14)
+		if (!intel_uc_fw_is_running(&gsc->fw))
+			return false;
+
+	/* MEI/GSC interface is solid depending on which is used */
 	mutex_lock(&dev_priv->display.hdcp.comp_mutex);
 	if (!dev_priv->display.hdcp.comp_added ||  !dev_priv->display.hdcp.master) {
 		mutex_unlock(&dev_priv->display.hdcp.comp_mutex);
@@ -2235,7 +2244,7 @@ static int initialize_hdcp_port_data(struct intel_connector *connector,
 
 static bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
 {
-	if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
+	if (DISPLAY_VER(dev_priv) < 14 && !IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
 		return false;
 
 	return (DISPLAY_VER(dev_priv) >= 10 ||
@@ -2256,10 +2265,14 @@ void intel_hdcp_component_init(struct drm_i915_private *dev_priv)
 
 	dev_priv->display.hdcp.comp_added = true;
 	mutex_unlock(&dev_priv->display.hdcp.comp_mutex);
-	ret = component_add_typed(dev_priv->drm.dev, &i915_hdcp_component_ops,
-				  I915_COMPONENT_HDCP);
+
+	if (DISPLAY_VER(dev_priv) >= 14)
+		ret = intel_gsc_hdcp_init(dev_priv);
+	else
+		ret = component_add_typed(dev_priv->drm.dev, &i915_hdcp_component_ops,
+					  I915_COMPONENT_HDCP);
 	if (ret < 0) {
-		drm_dbg_kms(&dev_priv->drm, "Failed at component add(%d)\n",
+		drm_dbg_kms(&dev_priv->drm, "Failed at fw component add(%d)\n",
 			    ret);
 		mutex_lock(&dev_priv->display.hdcp.comp_mutex);
 		dev_priv->display.hdcp.comp_added = false;
@@ -2485,7 +2498,10 @@ void intel_hdcp_component_fini(struct drm_i915_private *dev_priv)
 	dev_priv->display.hdcp.comp_added = false;
 	mutex_unlock(&dev_priv->display.hdcp.comp_mutex);
 
-	component_del(dev_priv->drm.dev, &i915_hdcp_component_ops);
+	if (DISPLAY_VER(dev_priv) >= 14)
+		intel_gsc_hdcp_fini(dev_priv);
+	else
+		component_del(dev_priv->drm.dev, &i915_hdcp_component_ops);
 }
 
 void intel_hdcp_cleanup(struct intel_connector *connector)
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
index 8ac11fe63914..f08a501502e2 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
@@ -3,6 +3,7 @@
  * Copyright 2021, Intel Corporation.
  */
 
+#include <drm/i915_cp_fw_hdcp_interface.h>
 #include "i915_drv.h"
 #include "gt/uc/intel_gsc_fw.h"
 #include "gt/uc/intel_gsc_fwif.h"
@@ -16,6 +17,505 @@ struct intel_hdcp_gsc_message {
 	void *hdcp_cmd;
 };
 
+static int
+gsc_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
+			  struct hdcp2_ake_init *ake_data)
+{
+	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
+	struct wired_cmd_initiate_hdcp2_session_out
+						session_init_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !ake_data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_session_in(&session_init_in, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&session_init_in,
+				       sizeof(session_init_in),
+				       (u8 *)&session_init_out,
+				       sizeof(session_init_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (session_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X Failed. Status: 0x%X\n",
+			    WIRED_INITIATE_HDCP2_SESSION,
+			    session_init_out.header.status);
+		return -EIO;
+	}
+
+	ake_data->msg_id = HDCP_2_2_AKE_INIT;
+	ake_data->tx_caps = session_init_out.tx_caps;
+	memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
+
+	return 0;
+}
+
+static int
+gsc_hdcp_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)
+{
+	struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
+	struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_rxcert_in(&verify_rxcert_in, rx_cert, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&verify_rxcert_in,
+				       sizeof(verify_rxcert_in),
+				       (u8 *)&verify_rxcert_out,
+				       sizeof(verify_rxcert_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed: %zd\n", byte);
+		return byte;
+	}
+
+	if (verify_rxcert_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X Failed. Status: 0x%X\n",
+			    WIRED_VERIFY_RECEIVER_CERT,
+			    verify_rxcert_out.header.status);
+		return -EIO;
+	}
+
+	*km_stored = !!verify_rxcert_out.km_stored;
+	if (verify_rxcert_out.km_stored) {
+		ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
+		*msg_sz = sizeof(struct hdcp2_ake_stored_km);
+	} else {
+		ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
+		*msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
+	}
+
+	memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
+	       sizeof(verify_rxcert_out.ekm_buff));
+
+	return 0;
+}
+
+static int
+gsc_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
+		       struct hdcp2_ake_send_hprime *rx_hprime)
+{
+	struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
+	struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !rx_hprime)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_hprime_in(&send_hprime_in, rx_hprime, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&send_hprime_in,
+				       sizeof(send_hprime_in),
+				       (u8 *)&send_hprime_out,
+				       sizeof(send_hprime_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (send_hprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X Failed. Status: 0x%X\n",
+			    WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int
+gsc_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
+			    struct hdcp2_ake_send_pairing_info *pairing_info)
+{
+	struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
+	struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !pairing_info)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_pairing_info_in(&pairing_info_in, pairing_info,
+				       data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&pairing_info_in,
+				       sizeof(pairing_info_in),
+				       (u8 *)&pairing_info_out,
+				       sizeof(pairing_info_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (pairing_info_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. Status: 0x%X\n",
+			    WIRED_AKE_SEND_PAIRING_INFO,
+			    pairing_info_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int
+gsc_hdcp_initiate_locality_check(struct device *dev,
+				 struct hdcp_port_data *data,
+				 struct hdcp2_lc_init *lc_init_data)
+{
+	struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
+	struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !lc_init_data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_locality_check_in(&lc_init_in, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&lc_init_in, sizeof(lc_init_in),
+				       (u8 *)&lc_init_out, sizeof(lc_init_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (lc_init_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X Failed. status: 0x%X\n",
+			    WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
+		return -EIO;
+	}
+
+	lc_init_data->msg_id = HDCP_2_2_LC_INIT;
+	memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
+
+	return 0;
+}
+
+static int
+gsc_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
+		       struct hdcp2_lc_send_lprime *rx_lprime)
+{
+	struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
+	struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !rx_lprime)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_validate_locality_in(&verify_lprime_in, rx_lprime,
+					    data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&verify_lprime_in,
+				       sizeof(verify_lprime_in),
+				       (u8 *)&verify_lprime_out,
+				       sizeof(verify_lprime_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (verify_lprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. status: 0x%X\n",
+			    WIRED_VALIDATE_LOCALITY,
+			    verify_lprime_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int gsc_hdcp_get_session_key(struct device *dev,
+				    struct hdcp_port_data *data,
+				    struct hdcp2_ske_send_eks *ske_data)
+{
+	struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
+	struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data || !ske_data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_session_key_in(&get_skey_in, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&get_skey_in, sizeof(get_skey_in),
+				       (u8 *)&get_skey_out, sizeof(get_skey_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (get_skey_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. status: 0x%X\n",
+			    WIRED_GET_SESSION_KEY, get_skey_out.header.status);
+		return -EIO;
+	}
+
+	ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
+	memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
+	       HDCP_2_2_E_DKEY_KS_LEN);
+	memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);
+
+	return 0;
+}
+
+static int
+gsc_hdcp_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)
+{
+	struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
+	struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !rep_topology || !rep_send_ack || !data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_repeater_in(&verify_repeater_in, rep_topology, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&verify_repeater_in,
+				       sizeof(verify_repeater_in),
+				       (u8 *)&verify_repeater_out,
+				       sizeof(verify_repeater_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (verify_repeater_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. status: 0x%X\n",
+			    WIRED_VERIFY_REPEATER,
+			    verify_repeater_out.header.status);
+		return -EIO;
+	}
+
+	memcpy(rep_send_ack->v, verify_repeater_out.v,
+	       HDCP_2_2_V_PRIME_HALF_LEN);
+	rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
+
+	return 0;
+}
+
+static int gsc_hdcp_verify_mprime(struct device *dev,
+				  struct hdcp_port_data *data,
+				  struct hdcp2_rep_stream_ready *stream_ready)
+{
+	struct wired_cmd_repeater_auth_stream_req_in *verify_mprime_in;
+	struct wired_cmd_repeater_auth_stream_req_out
+					verify_mprime_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+	size_t cmd_size;
+
+	if (!dev || !stream_ready || !data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	cmd_size = struct_size(verify_mprime_in, streams, data->k);
+	if (cmd_size == SIZE_MAX)
+		return -EINVAL;
+
+	verify_mprime_in = kzalloc(cmd_size, GFP_KERNEL);
+	if (!verify_mprime_in)
+		return -ENOMEM;
+
+	i915_cp_fw_fill_auth_stream_req_in(verify_mprime_in, stream_ready,
+					  cmd_size, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)verify_mprime_in, cmd_size,
+				       (u8 *)&verify_mprime_out,
+				       sizeof(verify_mprime_out));
+	kfree(verify_mprime_in);
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (verify_mprime_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. status: 0x%X\n",
+			    WIRED_REPEATER_AUTH_STREAM_REQ,
+			    verify_mprime_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int gsc_hdcp_enable_authentication(struct device *dev,
+					  struct hdcp_port_data *data)
+{
+	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
+	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_enable_auth_in(&enable_auth_in, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&enable_auth_in,
+				       sizeof(enable_auth_in),
+				       (u8 *)&enable_auth_out,
+				       sizeof(enable_auth_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (enable_auth_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "FW cmd 0x%08X failed. status: 0x%X\n",
+			    WIRED_ENABLE_AUTH, enable_auth_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int
+gsc_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
+{
+	struct wired_cmd_close_session_in session_close_in = { { 0 } };
+	struct wired_cmd_close_session_out session_close_out = { { 0 } };
+	struct drm_i915_private *i915;
+	ssize_t byte;
+
+	if (!dev || !data)
+		return -EINVAL;
+
+	i915 = kdev_to_i915(dev);
+	if (!i915) {
+		dev_err(dev, "DRM not initialized, aborting HDCP.\n");
+		return -ENODEV;
+	}
+
+	i915_cp_fw_fill_close_session_in(&session_close_in, data);
+	byte = intel_hdcp_gsc_msg_send(i915, (u8 *)&session_close_in,
+				       sizeof(session_close_in),
+				       (u8 *)&session_close_out,
+				       sizeof(session_close_out));
+	if (byte < 0) {
+		drm_dbg_kms(&i915->drm, "intel_hdcp_gsc_msg_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (session_close_out.header.status != FW_HDCP_STATUS_SUCCESS) {
+		drm_dbg_kms(&i915->drm, "Session Close Failed. status: 0x%X\n",
+			    session_close_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static const struct i915_hdcp_fw_ops gsc_hdcp_ops = {
+	.initiate_hdcp2_session = gsc_hdcp_initiate_session,
+	.verify_receiver_cert_prepare_km =
+				gsc_hdcp_verify_receiver_cert_prepare_km,
+	.verify_hprime = gsc_hdcp_verify_hprime,
+	.store_pairing_info = gsc_hdcp_store_pairing_info,
+	.initiate_locality_check = gsc_hdcp_initiate_locality_check,
+	.verify_lprime = gsc_hdcp_verify_lprime,
+	.get_session_key = gsc_hdcp_get_session_key,
+	.repeater_check_flow_prepare_ack =
+				gsc_hdcp_repeater_check_flow_prepare_ack,
+	.verify_mprime = gsc_hdcp_verify_mprime,
+	.enable_hdcp_authentication = gsc_hdcp_enable_authentication,
+	.close_hdcp_session = gsc_hdcp_close_session,
+};
+
+int intel_gsc_hdcp_init(struct drm_i915_private *i915)
+{
+	struct i915_hdcp_fw_master *data;
+
+	data = kzalloc(sizeof(struct i915_hdcp_fw_master), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mutex_lock(&i915->display.hdcp.comp_mutex);
+	i915->display.hdcp.master = data;
+	i915->display.hdcp.master->fw_dev = i915->drm.dev;
+	i915->display.hdcp.master->ops = &gsc_hdcp_ops;
+	mutex_unlock(&i915->display.hdcp.comp_mutex);
+
+	return 0;
+}
+
+int intel_gsc_hdcp_fini(struct drm_i915_private *i915)
+{
+	/* TODO: decrease GSC f/w reference count. */
+	kfree(i915->display.hdcp.master);
+	return 0;
+}
+
 /*This function helps allocate memory for the command that we will send to gsc cs */
 static int intel_initialize_hdcp_gsc_message(struct drm_i915_private *i915,
 		struct intel_hdcp_gsc_message *hdcp_message)
@@ -127,7 +627,8 @@ static int intel_gsc_send_sync(struct drm_i915_private *i915,
  * will follow
  */
 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)
+				size_t msg_in_len, u8 *msg_out,
+				size_t msg_out_len)
 {
 	struct intel_gt *gt = i915->media_gt;
 	struct intel_gsc_mtl_header *header;
-- 
2.25.1



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