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Commit b491264f authored by Ramalingam C's avatar Ramalingam C Committed by Daniel Vetter
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misc/mei/hdcp: Prepare Session Key 



Request to ME to prepare the encrypted session key.

On Success, ME provides Encrypted session key. Function populates
the HDCP2.2 authentication msg SKE_Send_Eks.

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 fixed [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]
v9:
  renamed func as mei_hdcp_* [Tomas]
  Inline function is defined for DDI index [Tomas]
v10:
  K-Doc fix. [Tomas]
v11:
  Rebased.

Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Acked-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-11-git-send-email-ramalingam.c@intel.com
parent 45479b67

drivers/misc/mei/hdcp/mei_hdcp.c

+58 −1
Original line number Diff line number Diff line
@@ -409,6 +409,63 @@ mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data, 
	return 0;

}



/**

 * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.

 * @dev: device corresponding to the mei_cl_device

 * @data: Intel HW specific hdcp data

 * @ske_data: SKE_Send_Eks msg output from ME FW.

 *

 * Return: 0 on Success, <0 on Failure

 */

static int mei_hdcp_get_session_key(struct device *dev,

				    struct hdcp_port_data *data,

				    struct hdcp2_ske_send_eks *ske_data)

{

	struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };

	struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };

	struct mei_cl_device *cldev;

	ssize_t byte;



	if (!dev || !data || !ske_data)

		return -EINVAL;



	cldev = to_mei_cl_device(dev);



	get_skey_in.header.api_version = HDCP_API_VERSION;

	get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;

	get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS;

	get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;



	get_skey_in.port.integrated_port_type = data->port_type;

	get_skey_in.port.physical_port = mei_get_ddi_index(data->port);



	byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));

	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);

		return byte;

	}



	byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));



	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);

		return byte;

	}



	if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) {

		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",

			WIRED_GET_SESSION_KEY, get_skey_out.header.status);

		return -EIO;

	}



	ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;

	memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,

	       HDCP_2_2_E_DKEY_KS_LEN);

	memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);



	return 0;

}



static const __attribute__((unused))

struct i915_hdcp_component_ops mei_hdcp_ops = {

	.owner = THIS_MODULE,
@@ -419,7 +476,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = { 
	.store_pairing_info = mei_hdcp_store_pairing_info,

	.initiate_locality_check = mei_hdcp_initiate_locality_check,

	.verify_lprime = mei_hdcp_verify_lprime,

	.get_session_key = NULL,

	.get_session_key = mei_hdcp_get_session_key,

	.repeater_check_flow_prepare_ack = NULL,

	.verify_mprime = NULL,

	.enable_hdcp_authentication = NULL,