[PATCH v5 08/40] 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]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |   2 +
 drivers/gpu/drm/i915/intel_dp.c   |   3 +-
 drivers/gpu/drm/i915/intel_drv.h  |   5 +-
 drivers/gpu/drm/i915/intel_hdcp.c | 204 +++++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_hdmi.c |   2 +-
 include/drm/i915_component.h      |  88 ++++++++++++++++
 6 files changed, 298 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6f08ab310118..0e6fe140dc63 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2142,6 +2142,8 @@ struct drm_i915_private {
 
 	struct i915_pmu pmu;
 
+	struct i915_hdcp_component *hdcp_comp;
+
 	/*
 	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
 	 * will be rejected. Instead look for a better place.
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index c1b2f00f324b..6bcc52766ea3 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6404,7 +6404,8 @@ 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 b615ea4a44c3..2eeb82b04953 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -441,9 +441,7 @@ struct intel_hdcp {
 	uint32_t seq_num_m;
 
 	/* mei interface related information */
-	struct mei_cl_device *cldev;
 	struct mei_hdcp_data mei_data;
-
 	struct delayed_work hdcp2_check_work;
 };
 
@@ -1962,7 +1960,8 @@ 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);
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 65bbe5874eee..769560591aa8 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 +910,191 @@ int intel_hdcp_check_link(struct intel_connector *connector)
 	mutex_unlock(&hdcp->hdcp_mutex);
 	return ret;
 }
+
+static int i915_hdcp_component_master_bind(struct device *dev)
+{
+	struct drm_i915_private *dev_priv = kdev_to_i915(dev);
+	struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
+	int ret;
+
+	mutex_lock(&comp->mutex);
+	ret = component_bind_all(dev, comp);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Atm, we don't support dynamic unbinding initiated by the child
+	 * component, so pin its containing module until we unbind.
+	 */
+	if (!try_module_get(comp->ops->owner)) {
+		ret = -ENODEV;
+		goto out_unbind;
+	}
+
+	mutex_unlock(&comp->mutex);
+	return 0;
+
+out_unbind:
+	component_unbind_all(dev, comp);
+	mutex_unlock(&comp->mutex);
+
+	return ret;
+}
+
+static void i915_hdcp_component_master_unbind(struct device *dev)
+{
+	struct drm_i915_private *dev_priv = kdev_to_i915(dev);
+	struct i915_hdcp_component *comp = dev_priv->hdcp_comp;
+
+	mutex_lock(&comp->mutex);
+	module_put(comp->ops->owner);
+	component_unbind_all(dev, comp);
+	WARN_ON(comp->ops);
+	mutex_unlock(&comp->mutex);
+}
+
+static const struct component_master_ops i915_hdcp_component_master_ops = {
+	.bind = i915_hdcp_component_master_bind,
+	.unbind = i915_hdcp_component_master_unbind,
+};
+
+static void intel_hdcp_component_cleanup(struct drm_i915_private *dev_priv)
+{
+	component_master_del(dev_priv->drm.dev,
+			     &i915_hdcp_component_master_ops);
+	kfree(dev_priv->hdcp_comp);
+}
+
+static void intel_hdcp2_exit(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	/* TO-DO: Disable the HDCP here */
+	kfree(connector->hdcp.mei_data.streams);
+
+	if (dev_priv->hdcp_comp)
+		intel_hdcp_component_cleanup(dev_priv);
+}
+
+static void intel_pull_down_mei_interface(struct device *kdev)
+{
+	struct drm_i915_private *dev_priv = kdev_to_i915(kdev);
+	struct drm_device *dev = &dev_priv->drm;
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+
+	DRM_INFO("MEI Device is Down");
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		intel_connector = to_intel_connector(connector);
+		if (!intel_connector->hdcp.hdcp2_supported)
+			continue;
+
+		intel_hdcp2_exit(intel_connector);
+	}
+	drm_connector_list_iter_end(&conn_iter);
+}
+
+struct i915_hdcp_component_master_ops master_ops = {
+	.pull_down_interface = intel_pull_down_mei_interface,
+};
+
+static int i915_hdcp_component_master_match(struct device *dev, void *data)
+{
+	return !strcmp(dev->driver->name, "mei_hdcp");
+}
+
+static int intel_hdcp_component_init(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct i915_hdcp_component *comp;
+	struct component_match *match = NULL;
+	int ret;
+
+	comp = kzalloc(sizeof(*comp), GFP_KERNEL);
+	if (!comp)
+		return -ENOMEM;
+
+	mutex_init(&comp->mutex);
+	comp->master_ops = &master_ops;
+	dev_priv->hdcp_comp = comp;
+
+	component_match_add(dev_priv->drm.dev, &match,
+			    i915_hdcp_component_master_match, dev_priv);
+	ret = component_master_add_with_match(dev_priv->drm.dev,
+					      &i915_hdcp_component_master_ops,
+					      match);
+	if (ret < 0)
+		goto out_err;
+
+	DRM_INFO("I915 hdcp component master added.\n");
+	return ret;
+
+out_err:
+	component_master_del(dev_priv->drm.dev,
+			     &i915_hdcp_component_master_ops);
+	kfree(comp);
+	dev_priv->hdcp_comp = NULL;
+	DRM_ERROR("Failed to add i915 hdcp component master (%d)\n", ret);
+
+	return ret;
+}
+
+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));
+}
+
+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;
+
+	if (!dev_priv->hdcp_comp)
+		ret = intel_hdcp_component_init(connector);
+
+	if (ret)
+		kfree(hdcp->mei_data.streams);
+	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 346b1f5cb180..9986174ee090 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
  */
@@ -121,4 +125,88 @@ 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_hdcp_component_master_ops {
+	void (*pull_down_interface)(struct device *dev);
+};
+
+/**
+ * struct i915_mei_hdcp_component - Used for direct communication between i915
+ * and mei_hdcp drivers
+ */
+struct i915_hdcp_component {
+	/**
+	 * @dev: Kdev of Slave Component. Passed to bind calls.
+	 */
+	struct device *dev;
+	/**
+	 * @i915_kdev: Kdev of I915. Used from the client component for
+	 * 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;
+	/**
+	 * @mutex: Mutex to protect the state of mei_cldev
+	 */
+	struct mutex mutex;
+	/**
+	 * @ops: Ops implemented by mei_hdcp driver, used by i915 driver.
+	 */
+	const struct i915_hdcp_component_ops *ops;
+	/**
+	 * @master_ops: Ops implemented by I915 driver, used by mei_hdcp driver.
+	 */
+	const struct i915_hdcp_component_master_ops *master_ops;
+};
+
 #endif /* _I915_COMPONENT_H_ */
-- 
2.7.4

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