Re: [PATCH v6 09/35] drm/i915: Initialize HDCP2.2 and its MEI interface

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>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
>daniel@xxxxxxxx; seanpaul@xxxxxxxxxxxx; Winkler, Tomas
><tomas.winkler@xxxxxxxxx>; Usyskin, Alexander <alexander.usyskin@xxxxxxxxx>;
>Shankar, Uma <uma.shankar@xxxxxxxxx>
>Cc: Sharma, Shashank <shashank.sharma@xxxxxxxxx>; C, Ramalingam
><ramalingam.c@xxxxxxxxx>
>Subject: [PATCH v6 09/35] drm/i915: Initialize HDCP2.2 and its MEI interface
>
>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]
>  Required HDCP2.2 variables defined [Sean Paul]
>
>Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
>---
> drivers/gpu/drm/i915/intel_dp.c   |  3 +-
> drivers/gpu/drm/i915/intel_drv.h  | 23 +++++++++++-
>drivers/gpu/drm/i915/intel_hdcp.c | 77
>++++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_hdmi.c |  2 +-
> include/drm/i915_component.h      | 60 ++++++++++++++++++++++++++++++
> 5 files changed, 161 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 c32665136d5d..38262792813a 100644
>--- a/drivers/gpu/drm/i915/intel_drv.h
>+++ b/drivers/gpu/drm/i915/intel_drv.h
>@@ -29,6 +29,7 @@
> #include <linux/i2c.h>
> #include <linux/hdmi.h>
> #include <linux/sched/clock.h>
>+#include <linux/mei_hdcp.h>
> #include <drm/i915_drm.h>
> #include "i915_drv.h"
> #include <drm/drm_crtc.h>
>@@ -376,6 +377,9 @@ struct intel_hdcp_shim {
> 	/* Detects panel's hdcp capability. This is optional for HDMI. */
> 	int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
> 			    bool *hdcp_capable);
>+
>+	/* Detects the HDCP protocol(DP/HDMI) required on the port */
>+	enum hdcp_protocol (*hdcp_protocol)(void);
> };
>
> struct intel_hdcp {
>@@ -385,6 +389,20 @@ struct intel_hdcp {
> 	uint64_t value;
> 	struct delayed_work check_work;
> 	struct work_struct prop_work;
>+
>+	/* HDCP2.2 related definitions */
>+	/* Flag indicates whether this connector supports HDCP2.2 or not. */
>+	bool hdcp2_supported;
>+
>+	/*
>+	 * Content Stream Type defined by content owner. TYPE0(0x0) content
>can
>+	 * flow in the link protected by HDCP2.2 or HDCP1.4, where as
>TYPE1(0x1)
>+	 * content can flow only through a link protected by HDCP2.2.
>+	 */
>+	u8 content_type;
>+
>+	/* mei interface related information */
>+	struct mei_hdcp_data mei_data;
> };
>
> struct intel_connector {
>@@ -1903,11 +1921,14 @@ 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 55bc4d423187..cfe915c3f336 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) @@ -
>744,11 +750,15 @@ 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 *shim)
>+		    const struct intel_hdcp_shim *shim,
>+		    bool hdcp2_supported)
> {
> 	struct intel_hdcp *hdcp = &connector->hdcp;
> 	int ret;
>
>+	if (!shim)
>+		return -EINVAL;
>+
> 	ret = drm_connector_attach_content_protection_property(
> 			&connector->base);
> 	if (ret)
>@@ -758,6 +768,10 @@ int intel_hdcp_init(struct intel_connector *connector,
> 	mutex_init(&hdcp->mutex);
> 	INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
> 	INIT_WORK(&hdcp->prop_work, intel_hdcp_prop_work);
>+
>+	if (hdcp2_supported)
>+		intel_hdcp2_init(connector);
>+
> 	return 0;
> }
>
>@@ -895,3 +909,64 @@ int intel_hdcp_check_link(struct intel_connector
>*connector)
> 	mutex_unlock(&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->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) {

The caller doesn't care for the return. Either make it void or handle the error.
I recommend later would be good.

>+	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));

Don't think this extra check is required, since it's called only from 1 place with
hdcp2 check already taken care of. This can be dropped.

>+	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);

A comment mentioning the reason for hdcp2 supported to be false would be good.

> 		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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