[PATCH v6 31/35] misc/mei/hdcp: Prepare Session Key

[Shankar, Uma]

>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>daniel at ffwll.ch; seanpaul at chromium.org; Winkler, Tomas
><tomas.winkler at intel.com>; Usyskin, Alexander <alexander.usyskin at intel.com>;
>Shankar, Uma <uma.shankar at intel.com>
>Cc: Sharma, Shashank <shashank.sharma at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v6 31/35] 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:
>  No change.
>

Looks ok to me.
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 62
>++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 60 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index c2d6d815354c..eb35e22fdeff 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -423,6 +423,65 @@ static int mei_verify_lprime(struct mei_cl_device *cldev,
> 	return 0;
> }
>
>+/*
>+ * mei_get_session_key:
>+ *	Function to prepare SKE_Send_Eks.
>+ *
>+ * cldev		: Pointer for mei client device
>+ * data			: Intel HW specific Data
>+ * ske_data		: Pointer for SKE_Send_Eks.
>+ *
>+ * Returns 0 on Success, <0 on Failure
>+ */
>+static int mei_get_session_key(struct mei_cl_device *cldev,
>+			       struct mei_hdcp_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 device *dev;
>+	ssize_t byte;
>+
>+	if (!data || !ske_data)
>+		return -EINVAL;
>+
>+	dev = &cldev->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 = 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;
>+}
>+
> struct i915_hdcp_component_ops mei_hdcp_component_ops = {
> 	.owner					= THIS_MODULE,
> 	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
>@@ -432,7 +491,7 @@ struct i915_hdcp_component_ops
>mei_hdcp_component_ops = {
> 	.store_pairing_info			= mei_store_pairing_info,
> 	.initiate_locality_check		= mei_initiate_locality_check,
> 	.verify_lprime				= mei_verify_lprime,
>-	.get_session_key			= NULL,
>+	.get_session_key			= mei_get_session_key,
> 	.repeater_check_flow_prepare_ack	= NULL,
> 	.verify_mprime				= NULL,
> 	.enable_hdcp_authentication		= NULL,
>@@ -441,7 +500,6 @@ struct i915_hdcp_component_ops
>mei_hdcp_component_ops = {
>
> static int mei_hdcp_component_bind(struct device *mei_kdev,
> 				   struct device *i915_kdev, void *data)
>-
> {
> 	struct i915_component_master *comp = data;
>
>--
>2.7.4