Re: [PATCH v10 26/40] misc/mei/hdcp: Verify Receiver Cert and prepare km

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>-----Original Message-----
>From: C, Ramalingam
>Sent: Thursday, January 31, 2019 12:30 PM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
>daniel.vetter@xxxxxxxx; Winkler, Tomas <tomas.winkler@xxxxxxxxx>; Shankar,
>Uma <uma.shankar@xxxxxxxxx>
>Cc: C, Ramalingam <ramalingam.c@xxxxxxxxx>
>Subject: [PATCH v10 26/40] 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:
>  Collected the Rb-ed by.
>  Rebasing.
>v7:
>  Adjust to the new mei interface.
>  Fix for Kdoc.
>v8:
>  K-Doc Addition. [Tomas]
>  memcpy for const length.
>
>Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
>Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>

Latest set look ok. You can keep the RB.

>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 81
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 80 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 534d29c8ee86..24665fff640d 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -90,11 +90,90 @@ mei_initiate_hdcp2_session(struct device *dev, struct
>hdcp_port_data *data,
> 	return 0;
> }
>
>+/**
>+ * mei_verify_receiver_cert_prepare_km() - Verify the Receiver
>+Certificate
>+ * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
>+ * @dev: device corresponding to the mei_cl_device
>+ * @hdcp_data: Intel HW specific hdcp data
>+ * @rx_cert: AKE_Send_Cert for verification
>+ * @km_stored: Pairing status flag output
>+ * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
>+ * @msg_sz : size of AKE_XXXXX_Km output msg
>+ *
>+ * Return: 0 on Success, <0 on Failure
>+ */
>+static int
>+mei_verify_receiver_cert_prepare_km(struct device *dev,
>+				    struct hdcp_port_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 mei_cl_device *cldev;
>+	ssize_t byte;
>+
>+	if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
>+		return -EINVAL;
>+
>+	cldev = to_mei_cl_device(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 =
>+(u8)GET_MEI_DDI_INDEX(data->port);
>+
>+	verify_rxcert_in.cert_rx = rx_cert->cert_rx;
>+	memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
>+	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;
>+}
>+
> static __attribute__((unused))
> struct i915_hdcp_component_ops mei_hdcp_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

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