Re: [PATCH v4 12/16] drm/i915/hdcp: MST streams support in hdcp port_data

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On 2020-11-05 at 22:04:15 +0530, Ramalingam C wrote:
> On 2020-10-27 at 22:12:04 +0530, Anshuman Gupta wrote:
> > Add support for multiple mst stream in hdcp port data
> > which will be used by RepeaterAuthStreamManage msg and
> > HDCP 2.2 security f/w for m' validation.
> > 
> > v2:
> > Init the hdcp port data k for HDMI/DP SST strem.
> > 
> > v3:
> > Cosmetic changes. [Uma]
> > 
> > Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> > Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
> > ---
> >  .../drm/i915/display/intel_display_types.h    |   4 +-
> >  drivers/gpu/drm/i915/display/intel_hdcp.c     | 103 +++++++++++++++---
> >  2 files changed, 92 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index 749c3a7e0b45..24e0067c2e7c 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -1445,10 +1445,12 @@ struct intel_digital_port {
> >  	enum phy_fia tc_phy_fia;
> >  	u8 tc_phy_fia_idx;
> >  
> > -	/* protects num_hdcp_streams reference count, port_data */
> > +	/* protects num_hdcp_streams reference count, port_data and port_auth */
> >  	struct mutex hdcp_mutex;
> >  	/* the number of pipes using HDCP signalling out of this port */
> >  	unsigned int num_hdcp_streams;
> > +	/* port HDCP auth status */
> > +	bool port_auth;
> >  	/* HDCP port data need to pass to security f/w */
> >  	struct hdcp_port_data port_data;
> since this is no more in hdcp related struct, it will be better to be named as
> hdcp_auth_status and hdcp_port_data !?
sure i will do this chnage.
Thanks,
Anshuman Gupta.
> 
> -Ram
> >  
> > diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > index a5ec4f72f50f..1df6d4a23476 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > @@ -26,6 +26,64 @@
> >  #define KEY_LOAD_TRIES	5
> >  #define HDCP2_LC_RETRY_CNT			3
> >  
> > +static int intel_conn_to_vcpi(struct intel_connector *connector)
> > +{
> > +	/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
> > +	return connector->port	? connector->port->vcpi.vcpi : 0;
> > +}
> > +
> > +static int
> > +intel_hdcp_required_content_stream(struct intel_digital_port *dig_port)
> > +{
> > +	struct drm_connector_list_iter conn_iter;
> > +	struct intel_digital_port *conn_dig_port;
> > +	struct intel_connector *connector;
> > +	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> > +	struct hdcp_port_data *data = &dig_port->port_data;
> > +	bool enforce_type0 = false;
> > +	int k;
> > +
> > +	if (dig_port->port_auth)
> > +		return 0;
> > +
> > +	drm_connector_list_iter_begin(&i915->drm, &conn_iter);
> > +	for_each_intel_connector_iter(connector, &conn_iter) {
> > +		if (!intel_encoder_is_mst(intel_attached_encoder(connector)))
> > +			continue;
> > +
> > +		conn_dig_port = intel_attached_dig_port(connector);
> > +		if (conn_dig_port != dig_port)
> > +			continue;
> > +
> > +		if (connector->base.status == connector_status_disconnected)
> > +			continue;
> > +
> > +		if (!enforce_type0 && !intel_hdcp2_capable(connector))
> > +			enforce_type0 = true;
> > +
> > +		data->streams[data->k].stream_id = intel_conn_to_vcpi(connector);
> > +		data->k++;
> > +
> > +		/* if there is only one active stream */
> > +		if (dig_port->dp.active_mst_links <= 1)
> > +			break;
> > +	}
> > +	drm_connector_list_iter_end(&conn_iter);
> > +
> > +	if (drm_WARN_ON(&i915->drm, data->k > INTEL_NUM_PIPES(i915) || data->k == 0))
> > +		return -EINVAL;
> > +
> > +	/*
> > +	 * Apply common protection level across all streams in DP MST Topology.
> > +	 * Use highest supported content type for all streams in DP MST Topology.
> > +	 */
> > +	for (k = 0; k < data->k; k++)
> > +		data->streams[k].stream_type =
> > +			enforce_type0 ? DRM_MODE_HDCP_CONTENT_TYPE0 : DRM_MODE_HDCP_CONTENT_TYPE1;
> > +
> > +	return 0;
> > +}
> > +
> >  static
> >  bool intel_hdcp_is_ksv_valid(u8 *ksv)
> >  {
> > @@ -1474,13 +1532,14 @@ static
> >  int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
> >  {
> >  	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> > +	struct hdcp_port_data *data = &dig_port->port_data;
> >  	struct intel_hdcp *hdcp = &connector->hdcp;
> >  	union {
> >  		struct hdcp2_rep_stream_manage stream_manage;
> >  		struct hdcp2_rep_stream_ready stream_ready;
> >  	} msgs;
> >  	const struct intel_hdcp_shim *shim = hdcp->shim;
> > -	int ret;
> > +	int ret, streams_size_delta, i;
> >  
> >  	if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX)
> >  		return -ERANGE;
> > @@ -1489,16 +1548,18 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
> >  	msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
> >  	drm_hdcp_cpu_to_be24(msgs.stream_manage.seq_num_m, hdcp->seq_num_m);
> >  
> > -	/* K no of streams is fixed as 1. Stored as big-endian. */
> > -	msgs.stream_manage.k = cpu_to_be16(1);
> > +	msgs.stream_manage.k = cpu_to_be16(data->k);
> >  
> > -	/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
> > -	msgs.stream_manage.streams[0].stream_id = 0;
> > -	msgs.stream_manage.streams[0].stream_type = hdcp->content_type;
> > +	for (i = 0; i < data->k; i++) {
> > +		msgs.stream_manage.streams[i].stream_id = data->streams[i].stream_id;
> > +		msgs.stream_manage.streams[i].stream_type = data->streams[i].stream_type;
> > +	}
> >  
> > +	streams_size_delta = (HDCP_2_2_MAX_CONTENT_STREAMS_CNT - data->k) *
> > +				sizeof(struct hdcp2_streamid_type);
> >  	/* Send it to Repeater */
> >  	ret = shim->write_2_2_msg(dig_port, &msgs.stream_manage,
> > -				  sizeof(msgs.stream_manage));
> > +				  sizeof(msgs.stream_manage) - streams_size_delta);
> >  	if (ret < 0)
> >  		goto out;
> >  
> > @@ -1507,8 +1568,7 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
> >  	if (ret < 0)
> >  		goto out;
> >  
> > -	dig_port->port_data.seq_num_m = hdcp->seq_num_m;
> > -	dig_port->port_data.streams[0].stream_type = hdcp->content_type;
> > +	data->seq_num_m = hdcp->seq_num_m;
> >  
> >  	ret = hdcp2_verify_mprime(connector, &msgs.stream_ready);
> >  
> > @@ -1669,6 +1729,7 @@ static int hdcp2_enable_encryption(struct intel_connector *connector)
> >  						 port),
> >  				    LINK_ENCRYPTION_STATUS,
> >  				    HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS);
> > +	dig_port->port_auth = true;
> >  
> >  	return ret;
> >  }
> > @@ -1743,11 +1804,9 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
> >  {
> >  	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> >  	struct drm_i915_private *i915 = to_i915(connector->base.dev);
> > -	struct hdcp_port_data *data = &dig_port->port_data;
> > -	struct intel_hdcp *hdcp = &connector->hdcp;
> > -	int ret, i, tries = 3;
> > +	int ret = 0, i, tries = 3;
> >  
> > -	for (i = 0; i < tries; i++) {
> > +	for (i = 0; i < tries && !dig_port->port_auth; i++) {
> >  		ret = hdcp2_authenticate_sink(connector);
> >  		if (!ret) {
> >  			ret = hdcp2_propagate_stream_management_info(connector);
> > @@ -1757,7 +1816,7 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
> >  					    ret);
> >  				break;
> >  			}
> > -			data->streams[0].stream_type = hdcp->content_type;
> > +
> >  			ret = hdcp2_authenticate_port(connector);
> >  			if (!ret)
> >  				break;
> > @@ -1792,7 +1851,9 @@ static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
> >  
> >  static int _intel_hdcp2_enable(struct intel_connector *connector)
> >  {
> > +	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> >  	struct drm_i915_private *i915 = to_i915(connector->base.dev);
> > +	struct hdcp_port_data *data = &dig_port->port_data;
> >  	struct intel_hdcp *hdcp = &connector->hdcp;
> >  	int ret;
> >  
> > @@ -1800,6 +1861,16 @@ static int _intel_hdcp2_enable(struct intel_connector *connector)
> >  		    connector->base.name, connector->base.base.id,
> >  		    hdcp->content_type);
> >  
> > +	/* Stream which requires encryption */
> > +	if (!intel_encoder_is_mst(intel_attached_encoder(connector))) {
> > +		data->k = 1;
> > +		data->streams[0].stream_type = hdcp->content_type;
> > +	} else {
> > +		ret = intel_hdcp_required_content_stream(dig_port);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> >  	ret = hdcp2_authenticate_and_encrypt(connector);
> >  	if (ret) {
> >  		drm_dbg_kms(&i915->drm, "HDCP2 Type%d  Enabling Failed. (%d)\n",
> > @@ -1817,7 +1888,9 @@ static int _intel_hdcp2_enable(struct intel_connector *connector)
> >  
> >  static int _intel_hdcp2_disable(struct intel_connector *connector)
> >  {
> > +	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> >  	struct drm_i915_private *i915 = to_i915(connector->base.dev);
> > +	struct hdcp_port_data *data = &dig_port->port_data;
> >  	int ret;
> >  
> >  	drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is being Disabled\n",
> > @@ -1829,6 +1902,8 @@ static int _intel_hdcp2_disable(struct intel_connector *connector)
> >  		drm_dbg_kms(&i915->drm, "Port deauth failed.\n");
> >  
> >  	connector->hdcp.hdcp2_encrypted = false;
> > +	dig_port->port_auth = false;
> > +	data->k = 0;
> >  
> >  	return ret;
> >  }
> > -- 
> > 2.26.2
> > 
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