[PATCH v8 21/35] misc/mei/hdcp: Verify Receiver Cert and prepare km

From: Ramalingam C <ramalingam.c@intel.com>
To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	daniel.vetter@ffwll.ch, tomas.winkler@intel.com
Cc: uma.shankar@intel.com
Subject: [PATCH v8 21/35] misc/mei/hdcp: Verify Receiver Cert and prepare km
Date: Tue, 27 Nov 2018 16:13:19 +0530	[thread overview]
Message-ID: <1543315413-24302-22-git-send-email-ramalingam.c@intel.com> (raw)
In-Reply-To: <1543315413-24302-1-git-send-email-ramalingam.c@intel.com>

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.
v7:
  Collected the Rb-ed by.
  Rebasing.
v8:
  Adjust to the new mei interface.
  Fix for Kdoc.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 84 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index ca8f82d25343..b38836dbdb66 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -82,11 +82,93 @@ static int mei_initiate_hdcp2_session(struct device *dev, void *hdcp_data,
 	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
+ *
+ * @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_XXXXX_msg output
+ * @msg_sz : size of AKE_XXXXX_Km output
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+static int
+mei_verify_receiver_cert_prepare_km(struct device *dev, void *hdcp_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;
+	struct mei_hdcp_data *data = hdcp_data;
+	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 = 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;
+}
+
 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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