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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
This commit is contained in:
Ramalingam C 2019-02-16 23:06:55 +05:30 committed by Daniel Vetter
parent bd90d7c783
commit d849178e2c
1 changed files with 123 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
drivers/gpu/drm/i915/intel_hdcp.c
View File

@ -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)