diff mbox series

[v11,29/42] misc/mei/hdcp: Verify Receiver Cert and prepare km

Message ID 1549487071-15343-30-git-send-email-ramalingam.c@intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915: Implement HDCP2.2 | expand

Commit Message

Ramalingam C Feb. 6, 2019, 9:04 p.m. UTC 
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.
v9:
  renamed func as mei_hdcp_* [Tomas]
  Inline function is defined for DDI index [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 83 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 1 deletion(-)

Comments

Winkler, Tomas Feb. 7, 2019, 9:23 p.m. UTC | #1 
> -----Original Message-----
> From: C, Ramalingam
> Sent: Wednesday, February 06, 2019 23:04
> To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org;
> daniel.vetter@ffwll.ch; Winkler, Tomas <tomas.winkler@intel.com>; Shankar,
> Uma <uma.shankar@intel.com>
> Cc: C, Ramalingam <ramalingam.c@intel.com>
> Subject: [PATCH v11 29/42] 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.
> v9:
>   renamed func as mei_hdcp_* [Tomas]
>   Inline function is defined for DDI index [Tomas]
> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 83
> +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 82 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 77dda13fcc88..4e471657c6f0 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -97,11 +97,92 @@ mei_hdcp_initiate_session(struct device *dev, struct
> hdcp_port_data *data,
>  	return 0;
>  }
> 
> +/**
> + * mei_hdcp_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_hdcp_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 = mei_get_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;
Would keep km_stored u8 or use something like
*km_stored = !!verify_rxcert_out.km_stored;

Looks good to me otherwise. 

> +	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_hdcp_initiate_session,
> -	.verify_receiver_cert_prepare_km = NULL,
> +	.verify_receiver_cert_prepare_km =
> +				mei_hdcp_verify_receiver_cert_prepare_km,
>  	.verify_hprime = NULL,
>  	.store_pairing_info = NULL,
>  	.initiate_locality_check = NULL,
> --
> 2.7.4
diff mbox series

Patch

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 77dda13fcc88..4e471657c6f0 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -97,11 +97,92 @@  mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
 	return 0;
 }
 
+/**
+ * mei_hdcp_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_hdcp_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 = mei_get_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_hdcp_initiate_session,
-	.verify_receiver_cert_prepare_km = NULL,
+	.verify_receiver_cert_prepare_km =
+				mei_hdcp_verify_receiver_cert_prepare_km,
 	.verify_hprime = NULL,
 	.store_pairing_info = NULL,
 	.initiate_locality_check = NULL,