Implements the HDCP2.2 repeaters authentication steps such as verifying the downstream topology and sending stream management information.
v2: Rebased. v3: -EINVAL is returned for topology error and rollover scenario. Endianness conversion func from drm_hdcp.h is used [Uma] v4: Rebased as part of patches reordering. Defined the mei service functions [Daniel] v5: Redefined the mei service functions as per comp redesign. v6: %s/uintxx_t/uxx Check for comp_master is removed. v7: Adjust to the new mei interface. style issue fixed. v8: drm_hdcp.h change is moved into separate patch [Daniel] v9: %s/__swab16/cpu_to_be16. [Tomas] Reviewed-by Uma.
Signed-off-by: Ramalingam C ramalingam.c@intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Reviewed-by: Uma Shankar uma.shankar@intel.com --- drivers/gpu/drm/i915/intel_hdcp.c | 125 +++++++++++++++++++++++++++++++++++++- 1 file changed, 123 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 8bd9f8d6ba34..a6920aaee3af 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -1041,7 +1041,7 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, return ret; }
-static __attribute__((unused)) int +static int hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, struct hdcp2_rep_send_receiverid_list *rep_topology, @@ -1070,7 +1070,7 @@ hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, return ret; }
-static __attribute__((unused)) int +static int hdcp2_verify_mprime(struct intel_connector *connector, struct hdcp2_rep_stream_ready *stream_ready) { @@ -1279,6 +1279,119 @@ static int hdcp2_session_key_exchange(struct intel_connector *connector) return 0; }
+static +int hdcp2_propagate_stream_management_info(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + 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; + + /* Prepare RepeaterAuth_Stream_Manage msg */ + msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; + drm_hdcp2_u32_to_seq_num(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); + + /* 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; + + /* Send it to Repeater */ + ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, + sizeof(msgs.stream_manage)); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, + &msgs.stream_ready, sizeof(msgs.stream_ready)); + if (ret < 0) + return ret; + + hdcp->port_data.seq_num_m = hdcp->seq_num_m; + hdcp->port_data.streams[0].stream_type = hdcp->content_type; + + ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); + if (ret < 0) + return ret; + + hdcp->seq_num_m++; + + if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { + DRM_DEBUG_KMS("seq_num_m roll over.\n"); + return -1; + } + + return 0; +} + +static +int hdcp2_authenticate_repeater_topology(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_rep_send_receiverid_list recvid_list; + struct hdcp2_rep_send_ack rep_ack; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + u8 *rx_info; + u32 seq_num_v; + int ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_SEND_RECVID_LIST, + &msgs.recvid_list, sizeof(msgs.recvid_list)); + if (ret < 0) + return ret; + + rx_info = msgs.recvid_list.rx_info; + + if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) || + HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) { + DRM_DEBUG_KMS("Topology Max Size Exceeded\n"); + return -EINVAL; + } + + /* Converting and Storing the seq_num_v to local variable as DWORD */ + seq_num_v = drm_hdcp2_seq_num_to_u32(msgs.recvid_list.seq_num_v); + + if (seq_num_v < hdcp->seq_num_v) { + /* Roll over of the seq_num_v from repeater. Reauthenticate. */ + DRM_DEBUG_KMS("Seq_num_v roll over.\n"); + return -EINVAL; + } + + ret = hdcp2_verify_rep_topology_prepare_ack(connector, + &msgs.recvid_list, + &msgs.rep_ack); + if (ret < 0) + return ret; + + hdcp->seq_num_v = seq_num_v; + ret = shim->write_2_2_msg(intel_dig_port, &msgs.rep_ack, + sizeof(msgs.rep_ack)); + if (ret < 0) + return ret; + + return 0; +} + +static int hdcp2_authenticate_repeater(struct intel_connector *connector) +{ + int ret; + + ret = hdcp2_authenticate_repeater_topology(connector); + if (ret < 0) + return ret; + + return hdcp2_propagate_stream_management_info(connector); +} + static int hdcp2_authenticate_sink(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); @@ -1312,6 +1425,14 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) return ret; }
+ if (hdcp->is_repeater) { + ret = hdcp2_authenticate_repeater(connector); + if (ret < 0) { + DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); + return ret; + } + } + hdcp->port_data.streams[0].stream_type = hdcp->content_type; ret = hdcp2_authenticate_port(connector); if (ret < 0)