>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
>daniel@xxxxxxxx; seanpaul@xxxxxxxxxxxx; Winkler, Tomas
><tomas.winkler@xxxxxxxxx>; Usyskin, Alexander <alexander.usyskin@xxxxxxxxx>;
>Shankar, Uma <uma.shankar@xxxxxxxxx>
>Cc: Sharma, Shashank <shashank.sharma@xxxxxxxxx>; C, Ramalingam
><ramalingam.c@xxxxxxxxx>
>Subject: [PATCH v6 27/35] misc/mei/hdcp: Verify H_prime
>
>Requests for the verification of AKE_Send_H_prime.
>
>ME will calculate the H and comparing it with received H_Prime.
>The result will be returned as status.
>
>Here AKE_Send_H_prime is a HDCP2.2 Authentication msg.
>
>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]
> Styles and typos fixed [Uma]
>v5:
> Rebased.
>v6:
> No change.
>
Looks ok to me.
Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
>Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 61
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 60 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 7d35066f21e2..d455d4e54f46 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -187,12 +187,71 @@ mei_verify_receiver_cert_prepare_km(struct
>mei_cl_device *cldev,
> return 0;
> }
>
>+/*
>+ * mei_verify_hprime:
>+ * Function to verify AKE_Send_H_prime received, through ME FW.
>+ *
>+ * cldev : Pointer for mei client device
>+ * data : Intel HW specific Data
>+ * rx_hprime : Pointer for AKE_Send_H_prime
>+ * hprime_sz : Input buffer size
>+ *
>+ * Returns 0 on Success, <0 on Failure
>+ */
>+static int mei_verify_hprime(struct mei_cl_device *cldev,
>+ struct mei_hdcp_data *data,
>+ struct hdcp2_ake_send_hprime *rx_hprime) {
>+ struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
>+ struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
>+ struct device *dev;
>+ ssize_t byte;
>+
>+ if (!data || !rx_hprime)
>+ return -EINVAL;
>+
>+ dev = &cldev->dev;
>+
>+ send_hprime_in.header.api_version = HDCP_API_VERSION;
>+ send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
>+ send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
>+ send_hprime_in.header.buffer_len =
>+WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
>+
>+ send_hprime_in.port.integrated_port_type = data->port_type;
>+ send_hprime_in.port.physical_port = data->port;
>+
>+ memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
>+ sizeof(rx_hprime->h_prime));
>+
>+ byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
>+ sizeof(send_hprime_in));
>+ if (byte < 0) {
>+ dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
>+ return byte;
>+ }
>+
>+ byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
>+ sizeof(send_hprime_out));
>+ if (byte < 0) {
>+ dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
>+ return byte;
>+ }
>+
>+ if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>+ dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
>+ WIRED_AKE_SEND_HPRIME,
>send_hprime_out.header.status);
>+ return -EIO;
>+ }
>+
>+ 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 =
> mei_verify_receiver_cert_prepare_km,
>- .verify_hprime = NULL,
>+ .verify_hprime = mei_verify_hprime,
> .store_pairing_info = NULL,
> .initiate_locality_check = NULL,
> .verify_lprime = NULL,
>--
>2.7.4
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