Implements the HDCP2.2 repeaters authentication steps such as verifying the downstream topology and sending stream management information.
v2: Rebased. v3: No Changes. v4: -EINVAL is returned for topology error and rollover scenario. Endianness conversion func from drm_hdcp.h is used [Uma] v5: Rebased as part of patches reordering. Defined the mei service functions [Daniel] v6: Redefined the mei service functions as per comp redesign.
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/intel_hdcp.c | 171 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_hdcp.h | 15 ++++ 2 files changed, 186 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index ee1e06bac175..a08d80c710d7 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -1144,6 +1144,56 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, return ret; }
+static int +hdcp2_verify_rep_topology_prepare_ack( + struct intel_connector *connector, + struct hdcp2_rep_send_receiverid_list *rep_topology, + struct hdcp2_rep_send_ack *rep_send_ack) +{ + struct mei_hdcp_data *data = &connector->hdcp.mei_data; + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct i915_component_master *comp = dev_priv->comp_master; + int ret; + + if (!comp) + return -EINVAL; + + if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT) + return -EINVAL; + + ret = comp->hdcp_ops->repeater_check_flow_prepare_ack(comp->mei_cldev, + data, + rep_topology, + rep_send_ack); + if (ret < 0) + comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data); + + return ret; +} + +static int +hdcp2_verify_mprime(struct intel_connector *connector, + struct hdcp2_rep_stream_ready *stream_ready) +{ + struct mei_hdcp_data *data = &connector->hdcp.mei_data; + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct i915_component_master *comp = dev_priv->comp_master; + int ret; + + if (!comp) + return -EINVAL; + + if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT) + return -EINVAL; + + ret = comp->hdcp_ops->verify_mprime(comp->mei_cldev, data, + stream_ready); + if (ret < 0) + comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data); + + return ret; +} + static int hdcp2_authenticate_port(struct intel_connector *connector) { struct mei_hdcp_data *data = &connector->hdcp.mei_data; @@ -1319,6 +1369,121 @@ 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; + reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN, + (u8 *)&hdcp->seq_num_m); + + /* K no of streams is fixed as 1. Stored as big-endian. */ + msgs.stream_manage.k = __swab16(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->mei_data.seq_num_m = hdcp->seq_num_m; + hdcp->mei_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; + uint8_t *rx_info; + uint32_t 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 */ + reverse_endianness((u8 *)&seq_num_v, HDCP_2_2_SEQ_NUM_LEN, + 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); @@ -1360,6 +1525,12 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) sizeof(stream_type_msg)); if (ret < 0) return ret; + } else 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->mei_data.streams[0].stream_type = hdcp->content_type; diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index 2b4cfb0b7324..c01cdb1d848d 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -252,4 +252,19 @@ struct hdcp2_dp_errata_stream_type { #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3))
+/* + * Library functions for endianness are aligned for 16/32/64 bits. + * But hdcp sequence numbers are 24bits. So for their Byte swapping, + * a conversion function is developed. + */ +static inline void reverse_endianness(u8 *dest, size_t sz, u8 *src) +{ + u32 index; + + if (!sz || sz > sizeof(u32)) + return; + for (index = 0; index < sz; index++) + dest[sz - index - 1] = src[index]; +} + #endif