From patchwork Thu Mar 8 11:58:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10267795 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1617560364 for ; Thu, 8 Mar 2018 12:07:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0636329889 for ; Thu, 8 Mar 2018 12:07:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EEF46298B9; Thu, 8 Mar 2018 12:07:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3FF2029889 for ; Thu, 8 Mar 2018 12:07:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ED0816E926; Thu, 8 Mar 2018 12:05:55 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 061C66E925; Thu, 8 Mar 2018 12:05:54 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Mar 2018 04:05:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,440,1515484800"; d="scan'208";a="32287885" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by FMSMGA003.fm.intel.com with ESMTP; 08 Mar 2018 04:05:51 -0800 From: Ramalingam C To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, seanpaul@chromium.org, chris@chris-wilson.co.uk, tomas.winkler@intel.com, jani.nikula@linux.intel.com Date: Thu, 8 Mar 2018 17:28:43 +0530 Message-Id: <1520510349-8385-17-git-send-email-ramalingam.c@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1520510349-8385-1-git-send-email-ramalingam.c@intel.com> References: <1520510349-8385-1-git-send-email-ramalingam.c@intel.com> Subject: [Intel-gfx] [PATCH v2 16/42] misc/mei/hdcp: Prepare Session Key X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: rodrigo.vivi@intel.com MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Request to ME to prepare the encrypted session key. On Success, ME provides Encrypted session key. Functions populates the HDCP2.2 authentication msg SKE_Send_Eks. v2: Rebased. Signed-off-by: Ramalingam C --- drivers/misc/mei/hdcp/mei_hdcp.c | 67 ++++++++++++++++++++++++++++++++++++++++ include/linux/mei_hdcp.h | 8 +++++ 2 files changed, 75 insertions(+) diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index c3c8b9a28498..fbb88a56e10c 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -468,6 +468,73 @@ int mei_verify_lprime(struct mei_hdcp_data *data, } EXPORT_SYMBOL(mei_verify_lprime); +/** + * mei_get_session_key: + * Function to prepare SKE_Send_Eks. + * + * @data : Intel HW specific Data + * @ske_data : Pointer for SKE_Send_Eks. + * + * Returns 0 on Success, <0 on Failure + */ +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data) +{ + struct wired_cmd_get_session_key_in get_skey_in = { { 0 } }; + struct wired_cmd_get_session_key_out get_skey_out = { { 0 } }; + enum me_hdcp_status status; + struct device *dev; + ssize_t byte; + + if (!data || !ske_data) + return -EINVAL; + + /* check for the mei_device enabled or not */ + if (!mei_cldev_active_and_enabled(data->cldev)) + return -ENODEV; + + dev = &data->cldev->dev; + + get_skey_in.header.api_version = HDCP_API_VERSION; + get_skey_in.header.command_id = WIRED_GET_SESSION_KEY; + get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS; + get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN; + + get_skey_in.port.integrated_port_type = data->port_type; + get_skey_in.port.physical_port = data->port; + + /* Request to ME */ + byte = mei_cldev_send(data->cldev, (u8 *)&get_skey_in, + sizeof(get_skey_in)); + if (byte < 0) { + dev_err(dev, "mei_cldev_send failed. %d\n", (int)byte); + return byte; + } + + /* Response from ME */ + byte = mei_cldev_recv(data->cldev, (u8 *)&get_skey_out, + sizeof(get_skey_out)); + + if (byte < 0) { + dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte); + return byte; + } + + status = (enum me_hdcp_status)get_skey_out.header.status; + if (status != ME_HDCP_STATUS_SUCCESS) { + dev_err(dev, "ME cmd 0x%08X failed. status: 0x%X\n", + WIRED_GET_SESSION_KEY, status); + return -1; + } + + ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS; + memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks, + HDCP_2_2_E_DKEY_KS_LEN); + memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN); + return 0; +} +EXPORT_SYMBOL(mei_get_session_key); + static int mei_hdcp_probe(struct mei_cl_device *cldev, const struct mei_cl_device_id *id) { diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h index d8c2b440cd81..193f23ba8fbc 100644 --- a/include/linux/mei_hdcp.h +++ b/include/linux/mei_hdcp.h @@ -119,6 +119,8 @@ int mei_initiate_locality_check(struct mei_hdcp_data *data, struct hdcp2_lc_init *lc_init_data); int mei_verify_lprime(struct mei_hdcp_data *data, struct hdcp2_lc_send_lprime *rx_lprime); +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data); #else static inline int mei_hdcp_cldev_get_reference(void *client_data, @@ -172,5 +174,11 @@ int mei_verify_lprime(struct mei_hdcp_data *data, { return -ENODEV; } +static inline +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data) +{ + return -ENODEV; +} #endif /* defined (CONFIG_INTEL_MEI_HDCP) */ #endif /* defined (_LINUX_MEI_HDCP_H) */