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misc/mei/hdcp: Verify M_prime

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Request to ME to verify the M_Prime received from the HDCP sink.

ME FW will calculate the M and compare with M_prime received
as part of RepeaterAuth_Stream_Ready, which is HDCP2.2 protocol msg.

On successful completion of this stage, downstream propagation of
the stream management info is completed.

v2: Rebased.
v3:
  cldev is passed as first parameter [Tomas]
  Redundant comments and cast are removed [Tomas]
v4:
  %zd for ssize_t [Alexander]
  %s/return -1/return -EIO [Alexander]
  endianness conversion func is moved to drm_hdcp.h [Uma]
v5: Rebased.
v6:
  Collected the Rb-ed by.
  Rebasing.
v7:
  Adjust to the new mei interface.
  Fix for Kdoc.
v8:
  K-Doc addition. [Tomas]
  drm_hdcp2_u32_to_seq_num() is used for u32 to seq_num.
v9:
  renamed func as mei_hdcp_* [Tomas]
  Inline function is defined for DDI index [Tomas]
v10:
  K-Doc fix. [Tomas]
v11:
  %s/__swab16/cpu_to_be16 [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-13-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2019-02-21 23:42:06 +05:30 committed by Daniel Vetter
parent f46ea842ed
commit 0a1af1b5c1
1 changed files with 66 additions and 1 deletions
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67
drivers/misc/mei/hdcp/mei_hdcp.c
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@ -540,6 +540,71 @@ mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
return 0;
}
/**
* mei_hdcp_verify_mprime() - Verify mprime.
* @dev: device corresponding to the mei_cl_device
* @data: Intel HW specific hdcp data
* @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
*
* Return: 0 on Success, <0 on Failure
*/
static int mei_hdcp_verify_mprime(struct device *dev,
struct hdcp_port_data *data,
struct hdcp2_rep_stream_ready *stream_ready)
{
struct wired_cmd_repeater_auth_stream_req_in
verify_mprime_in = { { 0 } };
struct wired_cmd_repeater_auth_stream_req_out
verify_mprime_out = { { 0 } };
struct mei_cl_device *cldev;
ssize_t byte;
if (!dev || !stream_ready || !data)
return -EINVAL;
cldev = to_mei_cl_device(dev);
verify_mprime_in.header.api_version = HDCP_API_VERSION;
verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
verify_mprime_in.header.buffer_len =
WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN;
verify_mprime_in.port.integrated_port_type = data->port_type;
verify_mprime_in.port.physical_port = mei_get_ddi_index(data->port);
memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
HDCP_2_2_MPRIME_LEN);
drm_hdcp2_u32_to_seq_num(verify_mprime_in.seq_num_m, data->seq_num_m);
memcpy(verify_mprime_in.streams, data->streams,
(data->k * sizeof(struct hdcp2_streamid_type)));
verify_mprime_in.k = cpu_to_be16(data->k);
byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in,
sizeof(verify_mprime_in));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
return byte;
}
byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
sizeof(verify_mprime_out));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
return byte;
}
if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
WIRED_REPEATER_AUTH_STREAM_REQ,
verify_mprime_out.header.status);
return -EIO;
}
return 0;
}
static const __attribute__((unused))
struct i915_hdcp_component_ops mei_hdcp_ops = {
.owner = THIS_MODULE,
@ -553,7 +618,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
.get_session_key = mei_hdcp_get_session_key,
.repeater_check_flow_prepare_ack =
mei_hdcp_repeater_check_flow_prepare_ack,
.verify_mprime = NULL,
.verify_mprime = mei_hdcp_verify_mprime,
.enable_hdcp_authentication = NULL,
.close_hdcp_session = NULL,
};