[PATCH v6 26/35] misc/mei/hdcp: Verify Receiver Cert and prepare km

[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 26/35] misc/mei/hdcp: Verify Receiver Cert and prepare km
>
>Requests for verification for receiver certification and also the preparation for
>next AKE auth message with km.
>
>On Success ME FW validate the HDCP2.2 receivers certificate and do the
>revocation check on the receiver ID. AKE_Stored_Km will be prepared if the
>receiver is already paired, else AKE_No_Stored_Km will be prepared.
>
>Here AKE_Stored_Km and AKE_No_Stored_Km are HDCP2.2 protocol msgs.
>
>v2:
>  Rebased.
>v3:
>  cldev is passed as first parameter [Tomas]
>  Redundant comments and cast are removed [Tomas]
>v4:
>  %zd is used for ssize_t [Alexander]
>  %s/return -1/return -EIO [Alexander]
>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 | 85
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 84 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 44b1aac03ff0..7d35066f21e2 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -105,10 +105,93 @@ static int mei_initiate_hdcp2_session(struct
>mei_cl_device *cldev,
> 	return 0;
> }
>
>+/*
>+ * mei_verify_receiver_cert_prepare_km:
>+ *	Function to verify the Receiver Certificate AKE_Send_Cert
>+ *	and prepare AKE_Stored_Km or AKE_No_Stored_Km
>+ *
>+ * cldev		: Pointer for mei client device
>+ * data			: Intel HW specific Data
>+ * rx_cert		: Pointer for AKE_Send_Cert
>+ * km_stored		: Pointer for pairing status flag
>+ * ek_pub_km		: Pointer for output msg
>+ * msg_sz		: Pointer for size of AKE_XXXXX_Km
>+ *
>+ * Returns 0 on Success, <0 on Failure
>+ */
>+static int
>+mei_verify_receiver_cert_prepare_km(struct mei_cl_device *cldev,
>+				    struct mei_hdcp_data *data,
>+				    struct hdcp2_ake_send_cert *rx_cert,
>+				    bool *km_stored,
>+				    struct hdcp2_ake_no_stored_km
>*ek_pub_km,
>+				    size_t *msg_sz)
>+{
>+	struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
>+	struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
>+	struct device *dev;
>+	ssize_t byte;
>+
>+	if (!data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
>+		return -EINVAL;
>+
>+	dev = &cldev->dev;
>+
>+	verify_rxcert_in.header.api_version = HDCP_API_VERSION;
>+	verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
>+	verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS;
>+	verify_rxcert_in.header.buffer_len =
>+
>	WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;
>+
>+	verify_rxcert_in.port.integrated_port_type = data->port_type;
>+	verify_rxcert_in.port.physical_port = data->port;
>+
>+	memcpy(&verify_rxcert_in.cert_rx, &rx_cert->cert_rx,
>+	       sizeof(rx_cert->cert_rx));
>+	memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, sizeof(rx_cert->r_rx));
>+	memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps,
>+HDCP_2_2_RXCAPS_LEN);
>+
>+	byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
>+			      sizeof(verify_rxcert_in));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
>+		return byte;
>+	}
>+
>+	byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
>+			      sizeof(verify_rxcert_out));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
>+		return byte;
>+	}
>+
>+	if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>+		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
>+			WIRED_VERIFY_RECEIVER_CERT,
>+			verify_rxcert_out.header.status);
>+		return -EIO;
>+	}
>+
>+	*km_stored = verify_rxcert_out.km_stored;
>+	if (verify_rxcert_out.km_stored) {
>+		ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
>+		*msg_sz = sizeof(struct hdcp2_ake_stored_km);
>+	} else {
>+		ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
>+		*msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
>+	}
>+
>+	memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
>+	       sizeof(verify_rxcert_out.ekm_buff));
>+
>+	return 0;
>+}
>+
> struct i915_hdcp_component_ops mei_hdcp_component_ops = {
> 	.owner					= THIS_MODULE,
> 	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
>-	.verify_receiver_cert_prepare_km	= NULL,
>+	.verify_receiver_cert_prepare_km	=
>+					mei_verify_receiver_cert_prepare_km,
> 	.verify_hprime				= NULL,
> 	.store_pairing_info			= NULL,
> 	.initiate_locality_check		= NULL,
>--
>2.7.4