[Intel-gfx] [PATCH v14 28/33] misc/mei/hdcp: Repeater topology verification and ack

[Winkler, Tomas]

> ack
> 
> Request ME to verify the downstream topology information received.
> 
> ME FW will validate the Repeaters receiver id list and downstream topology.
> 
> On Success ME FW will provide the Least Significant 128bits of VPrime, which
> forms the repeater ack.
> 
> 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]
>   Style and typos fixed [Uma]
> v5: Rebased.
> v6: Rebasing.
> v7:
>   Adjust to the new mei interface.
>   Fix for Kdoc.
> v8:
>   K-Doc addition. [Tomas]
> v9:
>   renamed func as mei_hdcp_* [Tomas]
>   Inline function is defined for DDI index [Tomas]
> v10:
>   K-Doc fix. [Tomas]
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> Reviewed-by: Uma Shankar <uma.shankar at intel.com>
> Acked-by: Tomas Winkler <tomas.winkler at intel.com>

LGTM

> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 77
> +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 76 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index fe5070f901e8..c06a9805ac85 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -466,6 +466,80 @@ static int mei_hdcp_get_session_key(struct device
> *dev,
>  	return 0;
>  }
> 
> +/**
> + * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream
> +topology
> + * and prepare rep_ack.
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + * @rep_topology: Receiver ID List to be validated
> + * @rep_send_ack : repeater ack from ME FW.
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int
> +mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
> +					 struct hdcp_port_data *data,
> +					 struct hdcp2_rep_send_receiverid_list
> +							*rep_topology,
> +					 struct hdcp2_rep_send_ack
> +							*rep_send_ack)
> +{
> +	struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
> +	struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
> +	struct mei_cl_device *cldev;
> +	ssize_t byte;
> +
> +	if (!dev || !rep_topology || !rep_send_ack || !data)
> +		return -EINVAL;
> +
> +	cldev = to_mei_cl_device(dev);
> +
> +	verify_repeater_in.header.api_version = HDCP_API_VERSION;
> +	verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
> +	verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
> +	verify_repeater_in.header.buffer_len =
> +
> 	WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
> +
> +	verify_repeater_in.port.integrated_port_type = data->port_type;
> +	verify_repeater_in.port.physical_port = mei_get_ddi_index(data-
> >port);
> +
> +	memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
> +	       HDCP_2_2_RXINFO_LEN);
> +	memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
> +	       HDCP_2_2_SEQ_NUM_LEN);
> +	memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
> +	       HDCP_2_2_V_PRIME_HALF_LEN);
> +	memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
> +	       HDCP_2_2_RECEIVER_IDS_MAX_LEN);
> +
> +	byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
> +			      sizeof(verify_repeater_in));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
> +			      sizeof(verify_repeater_out));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> +		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
> +			WIRED_VERIFY_REPEATER,
> +			verify_repeater_out.header.status);
> +		return -EIO;
> +	}
> +
> +	memcpy(rep_send_ack->v, verify_repeater_out.v,
> +	       HDCP_2_2_V_PRIME_HALF_LEN);
> +	rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
> +
> +	return 0;
> +}
> +
>  static __attribute__((unused))
>  struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.owner = THIS_MODULE,
> @@ -477,7 +551,8 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.initiate_locality_check = mei_hdcp_initiate_locality_check,
>  	.verify_lprime = mei_hdcp_verify_lprime,
>  	.get_session_key = mei_hdcp_get_session_key,
> -	.repeater_check_flow_prepare_ack = NULL,
> +	.repeater_check_flow_prepare_ack =
> +				mei_hdcp_repeater_check_flow_prepare_ack,
>  	.verify_mprime = NULL,
>  	.enable_hdcp_authentication = NULL,
>  	.close_hdcp_session = NULL,
> --
> 2.7.4