Re: [PATCH v10 27/40] misc/mei/hdcp: Verify H_prime

Shankar, Uma
2019-02-04T16:11:19Z

>-----Original Message-----
>From: C, Ramalingam
>Sent: Thursday, January 31, 2019 12:30 PM
>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 v10 27/40] 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:
> 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@intel.com>
>Reviewed-by: Uma Shankar <uma.shankar@intel.com>

Latest set look ok. You can keep the RB.

>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 57
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 56 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 24665fff640d..74219e1487d3 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -169,12 +169,67 @@ mei_verify_receiver_cert_prepare_km(struct device
>*dev,
> return 0;
> }
>
>+/**
>+ * mei_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
>+ * @dev: device corresponding to the mei_cl_device
>+ * @hdcp_data: Intel HW specific hdcp data
>+ * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
>+ *
>+ * Return: 0 on Success, <0 on Failure
>+ */
>+static int mei_verify_hprime(struct device *dev, struct hdcp_port_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 mei_cl_device *cldev;
>+ ssize_t byte;
>+
>+ if (!dev || !data || !rx_hprime)
>+ return -EINVAL;
>+
>+ cldev = to_mei_cl_device(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 = (u8)GET_MEI_DDI_INDEX(data-
>>port);
>+
>+ memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
>+ HDCP_2_2_H_PRIME_LEN);
>+
>+ 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;
>+}
>+
> 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 =
>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