drm/i915: Implement HDCP2.2 repeater authentication

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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550338640-17470-9-git-send-email-ramalingam.c@intel.com

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index d63f620581ad29cc06d8702f14d32217abaa88ec..24051120d3bbba5c85e32debaca4950ff0164a1a 100644 (file)
--- 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)