[RFC 3/3] drm/i915: Initialize HDCP2.2 and its MEI interface

[Ramalingam C <ramalingam.c@intel.com>]

Initialize HDCP2.2 support. This includes the mei interface
initialization along with required component registration.

v2:
  mei interface handle is protected with mutex. [Chris Wilson]
v3:
  Notifiers are used for the mei interface state.
v4:
  Poll for mei client device state
  Error msg for out of mem [Uma]
  Inline req for init function removed [Uma]
v5:
  Rebase as Part of reordering.
  Component is used for the I915 and MEI_HDCP interface [Daniel]
v6:
  HDCP2.2 uses the I915 component master to communicate with mei_hdcp [Daniel]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c   |  3 +-
 drivers/gpu/drm/i915/intel_drv.h  |  5 ++-
 drivers/gpu/drm/i915/intel_hdcp.c | 78 ++++++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_hdmi.c |  2 +-
 include/drm/i915_component.h      | 60 ++++++++++++++++++++++++++++++
 5 files changed, 144 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5be07e1d816d..12eb5bd33b7e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6406,7 +6406,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	intel_dp_add_properties(intel_dp, connector);
 
 	if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
-		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
+		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim,
+					  false);
 		if (ret)
 			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
 	}
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 5799788c8f5d..c8b363772958 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1963,11 +1963,14 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 			     struct drm_connector_state *old_state,
 			     struct drm_connector_state *new_state);
 int intel_hdcp_init(struct intel_connector *connector,
-		    const struct intel_hdcp_shim *hdcp_shim);
+		    const struct intel_hdcp_shim *hdcp_shim,
+		    bool hdcp2_supported);
 int intel_hdcp_enable(struct intel_connector *connector);
 int intel_hdcp_disable(struct intel_connector *connector);
 int intel_hdcp_check_link(struct intel_connector *connector);
 bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
+int intel_hdcp_component_init(struct drm_i915_private *dev_priv);
+bool is_hdcp2_supported(struct drm_i915_private *dev_priv);
 
 /* intel_psr.c */
 #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 65bbe5874eee..39fece04bbee 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -8,13 +8,19 @@
 
 #include <drm/drmP.h>
 #include <drm/drm_hdcp.h>
+#include <drm/i915_component.h>
 #include <linux/i2c.h>
 #include <linux/random.h>
+#include <linux/component.h>
 
 #include "intel_drv.h"
 #include "i915_reg.h"
 
 #define KEY_LOAD_TRIES	5
+#define GET_MEI_DDI_INDEX(port)		(((port) == PORT_A) ? DDI_A : \
+					 (enum hdcp_physical_port)(port))
+
+static int intel_hdcp2_init(struct intel_connector *connector);
 
 static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
 				    const struct intel_hdcp_shim *shim)
@@ -743,11 +749,15 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
 }
 
 int intel_hdcp_init(struct intel_connector *connector,
-		    const struct intel_hdcp_shim *hdcp_shim)
+		    const struct intel_hdcp_shim *hdcp_shim,
+		    bool hdcp2_supported)
 {
 	struct intel_hdcp *hdcp = &connector->hdcp;
 	int ret;
 
+	if (!hdcp_shim)
+		return -EINVAL;
+
 	ret = drm_connector_attach_content_protection_property(
 			&connector->base);
 	if (ret)
@@ -757,6 +767,10 @@ int intel_hdcp_init(struct intel_connector *connector,
 	mutex_init(&hdcp->hdcp_mutex);
 	INIT_DELAYED_WORK(&hdcp->hdcp_check_work, intel_hdcp_check_work);
 	INIT_WORK(&hdcp->hdcp_prop_work, intel_hdcp_prop_work);
+
+	if (hdcp2_supported)
+		intel_hdcp2_init(connector);
+
 	return 0;
 }
 
@@ -896,3 +910,65 @@ int intel_hdcp_check_link(struct intel_connector *connector)
 	mutex_unlock(&hdcp->hdcp_mutex);
 	return ret;
 }
+
+
+static int i915_hdcp_component_match(struct device *dev, void *data)
+{
+	return !strcmp(dev->driver->name, "mei_hdcp");
+}
+
+static int initialize_mei_hdcp_data(struct intel_connector *connector)
+{
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	struct mei_hdcp_data *data = &hdcp->mei_data;
+	enum port port;
+
+	if (connector->encoder) {
+		port = connector->encoder->port;
+		data->port = GET_MEI_DDI_INDEX(port);
+	}
+
+	data->port_type = INTEGRATED;
+	data->protocol = hdcp->hdcp_shim->hdcp_protocol();
+
+	data->k = 1;
+	if (!data->streams)
+		data->streams = kcalloc(data->k,
+					sizeof(struct hdcp2_streamid_type),
+					GFP_KERNEL);
+	if (!data->streams) {
+		DRM_ERROR("Out of Memory\n");
+		return -ENOMEM;
+	}
+
+	data->streams[0].stream_id = 0;
+	data->streams[0].stream_type = hdcp->content_type;
+
+	return 0;
+}
+
+bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
+{
+	return ((INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
+		IS_KABYLAKE(dev_priv)) && IS_ENABLED(CONFIG_INTEL_MEI_HDCP));
+}
+
+static int intel_hdcp2_init(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_hdcp *hdcp = &connector->hdcp;
+	int ret;
+
+	WARN_ON(!is_hdcp2_supported(dev_priv));
+	ret = initialize_mei_hdcp_data(connector);
+	if (ret)
+		goto exit;
+
+	component_match_add(dev_priv->drm.dev, &dev_priv->master_match,
+			    i915_hdcp_component_match, dev_priv);
+
+	hdcp->hdcp2_supported = true;
+
+exit:
+	return ret;
+}
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 8363fbd18ee8..7988f958d835 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -2366,7 +2366,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
 
 	if (is_hdcp_supported(dev_priv, port)) {
 		int ret = intel_hdcp_init(intel_connector,
-					  &intel_hdmi_hdcp_shim);
+					  &intel_hdmi_hdcp_shim, false);
 		if (ret)
 			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
 	}
diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
index 52313bc227b2..f208a83ea2c9 100644
--- a/include/drm/i915_component.h
+++ b/include/drm/i915_component.h
@@ -24,6 +24,10 @@
 #ifndef _I915_COMPONENT_H_
 #define _I915_COMPONENT_H_
 
+#include <linux/mei_cl_bus.h>
+#include <linux/mei_hdcp.h>
+#include <drm/drm_hdcp.h>
+
 /* MAX_PORT is the number of port
  * It must be sync with I915_MAX_PORTS defined i915_drv.h
  */
@@ -121,6 +125,54 @@ struct i915_audio_component {
 	const struct i915_audio_component_audio_ops *audio_ops;
 };
 
+struct i915_hdcp_component_ops {
+	/**
+	 * @owner: mei_hdcp module
+	 */
+	struct module *owner;
+	int (*initiate_hdcp2_session)(struct mei_cl_device *cldev,
+				      struct mei_hdcp_data *data,
+				      struct hdcp2_ake_init *ake_data);
+	int
+	(*verify_receiver_cert_prepare_km)(struct mei_cl_device *cldev,
+					   struct mei_hdcp_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 (*verify_hprime)(struct mei_cl_device *cldev,
+			     struct mei_hdcp_data *data,
+			     struct hdcp2_ake_send_hprime *rx_hprime);
+	int (*store_pairing_info)(struct mei_cl_device *cldev,
+				  struct mei_hdcp_data *data,
+				  struct hdcp2_ake_send_pairing_info
+								*pairing_info);
+	int (*initiate_locality_check)(struct mei_cl_device *cldev,
+				       struct mei_hdcp_data *data,
+				       struct hdcp2_lc_init *lc_init_data);
+	int (*verify_lprime)(struct mei_cl_device *cldev,
+			     struct mei_hdcp_data *data,
+			     struct hdcp2_lc_send_lprime *rx_lprime);
+	int (*get_session_key)(struct mei_cl_device *cldev,
+			       struct mei_hdcp_data *data,
+			       struct hdcp2_ske_send_eks *ske_data);
+	int
+	(*repeater_check_flow_prepare_ack)(struct mei_cl_device *cldev,
+					   struct mei_hdcp_data *data,
+					   struct hdcp2_rep_send_receiverid_list
+								*rep_topology,
+					   struct hdcp2_rep_send_ack
+								*rep_send_ack);
+	int (*verify_mprime)(struct mei_cl_device *cldev,
+			     struct mei_hdcp_data *data,
+			     struct hdcp2_rep_stream_ready *stream_ready);
+	int (*enable_hdcp_authentication)(struct mei_cl_device *cldev,
+					  struct mei_hdcp_data *data);
+	int (*close_hdcp_session)(struct mei_cl_device *cldev,
+				  struct mei_hdcp_data *data);
+};
+
 /**
  * struct i915_component_master - Used for communication between i915
  * and any other drivers for the services of different feature.
@@ -131,6 +183,14 @@ struct i915_component_master {
 	 * removing the reference to mei_cldev.
 	 */
 	struct device *i915_kdev;
+	/**
+	 * @mei_cldev: mei client device, used as parameter for ops
+	 */
+	struct mei_cl_device *mei_cldev;
+	/**
+	 * @ops: Ops implemented by mei_hdcp driver, used by i915 driver.
+	 */
+	const struct i915_hdcp_component_ops *hdcp_ops;
 
 	/*
 	 * Add here the interface details between I915 and interested modules.
-- 
2.7.4

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