Re: [PATCH v11 36/42] 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]
> 
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
Ack,
Thanks
Tomas

> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 67
> +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 66 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index a64578cec0c9..1ebfc4aa2f04 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -535,6 +535,71 @@ 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
> + * @hdcp_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 = __swab16(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 __attribute__((unused))
>  struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.owner = THIS_MODULE,
> @@ -548,7 +613,7 @@ 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,
>  };
> --
> 2.7.4

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