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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. v9: renamed func as mei_hdcp_* [Tomas] Inline function is defined for DDI index [Tomas] v10: K-Doc fix. [Tomas] v11: Rebased. Signed-off-by: Ramalingam C <ramalingam.c@intel.com> Reviewed-by: Uma Shankar <uma.shankar@intel.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-7-git-send-email-ramalingam.c@intel.com
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@ -182,13 +182,69 @@ mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
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return 0;
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}
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/**
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* mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
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* @dev: device corresponding to the mei_cl_device
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* @data: Intel HW specific hdcp data
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* @rx_hprime: AKE_Send_H_prime msg for ME FW verification
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*
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* Return: 0 on Success, <0 on Failure
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*/
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static int
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mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
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struct hdcp2_ake_send_hprime *rx_hprime)
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{
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struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
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struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
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struct mei_cl_device *cldev;
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ssize_t byte;
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if (!dev || !data || !rx_hprime)
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return -EINVAL;
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cldev = to_mei_cl_device(dev);
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send_hprime_in.header.api_version = HDCP_API_VERSION;
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send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
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send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
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send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
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send_hprime_in.port.integrated_port_type = data->port_type;
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send_hprime_in.port.physical_port = mei_get_ddi_index(data->port);
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memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
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HDCP_2_2_H_PRIME_LEN);
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byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
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sizeof(send_hprime_in));
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if (byte < 0) {
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dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
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return byte;
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}
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byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
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sizeof(send_hprime_out));
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if (byte < 0) {
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dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
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return byte;
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}
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if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
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dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
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WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
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return -EIO;
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}
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return 0;
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}
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static const __attribute__((unused))
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struct i915_hdcp_component_ops mei_hdcp_ops = {
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.owner = THIS_MODULE,
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.initiate_hdcp2_session = mei_hdcp_initiate_session,
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.verify_receiver_cert_prepare_km =
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mei_hdcp_verify_receiver_cert_prepare_km,
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.verify_hprime = NULL,
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.verify_hprime = mei_hdcp_verify_hprime,
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.store_pairing_info = NULL,
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.initiate_locality_check = NULL,
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.verify_lprime = NULL,
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