>-----Original Message-----
>From: Intel-gfx [mailto:[email protected]] On Behalf Of
>Ramalingam C
>Sent: Tuesday, April 3, 2018 7:28 PM
>To: [email protected]; [email protected];
>[email protected]; [email protected]; [email protected];
>[email protected]; Winkler, Tomas <[email protected]>;
>Usyskin, Alexander <[email protected]>
>Cc: Vivi, Rodrigo <[email protected]>
>Subject: [Intel-gfx] [PATCH v3 24/40] 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:
> No Changes.
>
>Signed-off-by: Ramalingam C <[email protected]>
>---
> drivers/gpu/drm/i915/intel_hdcp.c | 135
>++++++++++++++++++++++++++++++++++++++
> 1 file changed, 135 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_hdcp.c
>b/drivers/gpu/drm/i915/intel_hdcp.c
>index ee9b7519fe73..d70320da85e4 100644
>--- a/drivers/gpu/drm/i915/intel_hdcp.c
>+++ b/drivers/gpu/drm/i915/intel_hdcp.c
>@@ -1145,6 +1145,135 @@ static int hdcp2_session_key_exchange(struct
>intel_connector *connector)
> return 0;
> }
>
>+/*
>+ * Lib endianness functions are aligned for 16/32/64 bits. Since here
>+sequence
>+ * num is 24bits developed a small conversion function.
>+ */
>+static inline void reverse_endianness(u8 *dest, size_t dst_sz, u8 *src)
This function is already defined and used in mei layer. Define this in some
common header file and use instead of duplicating it here. May be in below
file:
<drm/drm_connector.h>
>+{
>+ u32 index;
>+
>+ if (dest != NULL && dst_sz != 0) {
>+ for (index = 0; index < dst_sz && index < sizeof(u32);
>+ index++) {
>+ dest[dst_sz - index - 1] = src[index];
>+ }
>+ }
>+}
>+
>+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->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(hdcp, &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;
>+ }
Leave a blank line.
>+ 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->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 -1;
>+ }
>+
>+ /* 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 -1;
>+ }
>+
>+ ret = hdcp2_verify_rep_topology_prepare_ack(hdcp, &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);
>@@ -1186,6 +1315,12 @@ 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;
>--
>2.7.4
>
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