From patchwork Wed Feb 14 14:13:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10219085 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 8E32C60467 for ; Wed, 14 Feb 2018 14:20:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7F132288FC for ; Wed, 14 Feb 2018 14:20:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 73F5628FEE; Wed, 14 Feb 2018 14:20:38 +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 1683E288FC for ; Wed, 14 Feb 2018 14:20:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2A416E408; Wed, 14 Feb 2018 14:20:33 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5418C6E41E for ; Wed, 14 Feb 2018 14:20:31 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Feb 2018 06:20:31 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,512,1511856000"; d="scan'208";a="204076875" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by fmsmga005.fm.intel.com with ESMTP; 14 Feb 2018 06:20:28 -0800 From: Ramalingam C To: seanpaul@chromium.org, intel-gfx@lists.freedesktop.org, rodrigo.vivi@intel.com, daniel.vetter@ffwll.ch Date: Wed, 14 Feb 2018 19:43:34 +0530 Message-Id: <1518617638-21684-20-git-send-email-ramalingam.c@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1518617638-21684-1-git-send-email-ramalingam.c@intel.com> References: <1518617638-21684-1-git-send-email-ramalingam.c@intel.com> Subject: [Intel-gfx] [PATCH 19/43] misc/mei/hdcp: Verify M_prime 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: tomas.winkler@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 verify the M_Prime received from the HDCP sink. ME FW will calculate the M and compare with M_prime received as part of RepeaterAuth_Stream_Ready, which is HDCP2.2 protocol msg. On successful completion of this stage, downstream propagation of the stream management info is completed. Signed-off-by: Ramalingam C --- drivers/misc/mei/mei_hdcp.c | 86 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/mei_hdcp.h | 8 +++++ 2 files changed, 94 insertions(+) diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c index c91a96bc45e9..d950361206e2 100644 --- a/drivers/misc/mei/mei_hdcp.c +++ b/drivers/misc/mei/mei_hdcp.c @@ -626,6 +626,92 @@ mei_repeater_check_flow_prepare_ack(struct mei_hdcp_data *data, } EXPORT_SYMBOL(mei_repeater_check_flow_prepare_ack); +static inline void reverse_endianness(u8 *dest, size_t dst_sz, u8 *src) +{ + u32 index; + + if (dest != NULL && dst_sz != 0) { + for (index = 0; index < dst_sz && index < sizeof(u32); + index++) { + dest[dst_sz - index - 1] = src[index]; + } + } +} + +/** + * mei_verify_mprime: + * Function to verify mprime. + * + * @data : Intel HW specific Data + * @stream_ready : pointer for RepeaterAuth_Stream_Ready message. + * + * Returns 0 on Success, <0 on Failure + */ +int mei_verify_mprime(struct mei_hdcp_data *data, + struct hdcp2_rep_stream_ready *stream_ready) +{ + struct wired_cmd_repeater_auth_stream_req_in + verify_mprime_in = { { 0 } }; + struct wired_cmd_repeater_auth_stream_req_out + verify_mprime_out = { { 0 } }; + enum me_status status; + struct device *dev; + ssize_t byte; + + if (!stream_ready || !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; + + verify_mprime_in.header.api_version = HDCP_API_VERSION; + verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ; + verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS; + verify_mprime_in.header.buffer_len = + WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN; + + verify_mprime_in.port.integrated_port_type = data->port_type; + verify_mprime_in.port.physical_port = data->port; + + verify_mprime_in.k = data->k; + memcpy(verify_mprime_in.m_prime, stream_ready->m_prime, + sizeof(stream_ready->m_prime)); + reverse_endianness((u8 *)&verify_mprime_in.seq_num_m, HDCP_SEQ_NUM_LEN, + (u8 *)&data->seq_num_m); + memcpy(verify_mprime_in.streams, data->streams, + (data->k * sizeof(struct hdcp2_streamid_type))); + + verify_mprime_in.k = __swab16(data->k); + + /* Request to ME */ + byte = mei_cldev_send(data->cldev, (u8 *)&verify_mprime_in, + sizeof(verify_mprime_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 *)&verify_mprime_out, + sizeof(verify_mprime_out)); + if (byte < 0) { + dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte); + return byte; + } + + status = (enum me_status)verify_mprime_out.header.status; + if (status != ME_HDCP_STATUS_SUCCESS) { + dev_err(dev, "ME cmd 0x%08X failed. status: 0x%X\n", + WIRED_REPEATER_AUTH_STREAM_REQ, status); + return -1; + } + return 0; +} +EXPORT_SYMBOL(mei_verify_mprime); + 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 c8f6fc90f475..560fc62b2b41 100644 --- a/include/linux/mei_hdcp.h +++ b/include/linux/mei_hdcp.h @@ -126,6 +126,8 @@ mei_repeater_check_flow_prepare_ack(struct mei_hdcp_data *data, struct hdcp2_rep_send_receiverid_list *rep_topology, struct hdcp2_rep_send_ack *rep_send_ack); +int mei_verify_mprime(struct mei_hdcp_data *data, + struct hdcp2_rep_stream_ready *stream_ready); #else static inline int mei_hdcp_cldev_get_reference(void *client_data, @@ -193,5 +195,11 @@ mei_repeater_check_flow_prepare_ack(struct mei_hdcp_data *data, { return -ENODEV; } +static inline +int mei_verify_mprime(struct mei_hdcp_data *data, + struct hdcp2_rep_stream_ready *stream_ready) +{ + return -ENODEV; +} #endif /* defined (CONFIG_INTEL_MEI_HDCP) */ #endif /* defined (_LINUX_MEI_HDCP_H) */