From patchwork Thu Mar 8 11:58:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10267831 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 17D5960594 for ; Thu, 8 Mar 2018 12:08:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 07B4629837 for ; Thu, 8 Mar 2018 12:08:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F01B829888; Thu, 8 Mar 2018 12:08:27 +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 565FB29837 for ; Thu, 8 Mar 2018 12:08:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C6CCB6E8E5; Thu, 8 Mar 2018 12:06:21 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 036586E8E5; Thu, 8 Mar 2018 12:06:20 +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 04:06:20 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,440,1515484800"; d="scan'208";a="32288004" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by FMSMGA003.fm.intel.com with ESMTP; 08 Mar 2018 04:06:17 -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 Subject: [PATCH v2 25/42] drm/i915: Implement HDCP2.2 receiver authentication Date: Thu, 8 Mar 2018 17:28:52 +0530 Message-Id: <1520510349-8385-26-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> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: uma.shankar@intel.com, rodrigo.vivi@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Implements HDCP2.2 authentication for hdcp2.2 receivers, with following steps: Authentication and Key enchange (AKE). Locality Check (LC). Session Key Exchange(SKE). DP Errata for stream type confuguration for receivers. At AKE, the HDCP Receiver’s public key certificate is verified by the HDCP Transmitter. A Master Key k m is exchanged. At LC, the HDCP Transmitter enforces locality on the content by requiring that the Round Trip Time (RTT) between a pair of messages is not more than 20 ms. At SKE, The HDCP Transmitter exchanges Session Key ks with the HDCP Receiver. In DP HDCP2.2 encryption and decryption logics use the stream type as one of the parameter. So Before enabling the Encryption DP HDCP2.2 receiver needs to be communicated with stream type. This is added to spec as ERRATA. This generic implementation is complete only with the hdcp2_shim defined. v2: Rebased. Signed-off-by: Ramalingam C --- drivers/gpu/drm/i915/intel_hdcp.c | 184 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 8e4d281613f0..6fb9fd4d6e1c 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -18,6 +18,7 @@ #define GET_MEI_DDI_INDEX(port) (((port) == PORT_A) ? DDI_A : \ (enum physical_port) (port)) #define KEY_LOAD_TRIES 5 +#define HDCP2_LC_RETRY_CNT 3 static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port, const struct intel_hdcp_shim *shim) @@ -1011,3 +1012,186 @@ static inline int hdcp2_deauthenticate_port(struct intel_hdcp *hdcp) { return hdcp2_close_mei_session(hdcp); } + +static int hdcp2_authentication_key_exchange(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_ake_init ake_init; + struct hdcp2_ake_send_cert send_cert; + struct hdcp2_ake_no_stored_km no_stored_km; + struct hdcp2_ake_send_hprime send_hprime; + struct hdcp2_ake_send_pairing_info pairing_info; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->hdcp_shim; + size_t size; + int ret; + + /* Init for seq_num */ + hdcp->seq_num_v = 0; + hdcp->seq_num_m = 0; + + ret = hdcp2_prepare_ake_init(hdcp, &msgs.ake_init); + if (ret < 0) + return ret; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.ake_init, + sizeof(msgs.ake_init)); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_AKE_SEND_CERT, + &msgs.send_cert, sizeof(msgs.send_cert)); + if (ret < 0) + return ret; + + if (msgs.send_cert.rx_caps[0] != HDCP_2_2_RX_CAPS_VERSION_VAL) + return -EINVAL; + + hdcp->is_repeater = HDCP_2_2_RX_REPEATER(msgs.send_cert.rx_caps[2]); + + /* + * Here msgs.no_stored_km will hold msgs corresponding to the km + * stored also. + */ + ret = hdcp2_verify_rx_cert_prepare_km(hdcp, &msgs.send_cert, + &hdcp->is_paired, + &msgs.no_stored_km, &size); + if (ret < 0) + return ret; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.no_stored_km, size); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_AKE_SEND_HPRIME, + &msgs.send_hprime, sizeof(msgs.send_hprime)); + if (ret < 0) + return ret; + + ret = hdcp2_verify_hprime(hdcp, &msgs.send_hprime); + if (ret < 0) + return ret; + + if (!hdcp->is_paired) { + /* Pairing is required */ + ret = shim->read_2_2_msg(intel_dig_port, + HDCP_2_2_AKE_SEND_PARING_INFO, + &msgs.pairing_info, + sizeof(msgs.pairing_info)); + if (ret < 0) + return ret; + + ret = hdcp2_store_paring_info(hdcp, &msgs.pairing_info); + if (ret < 0) + return ret; + hdcp->is_paired = true; + } + return 0; +} + +static int hdcp2_locality_check(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_lc_init lc_init; + struct hdcp2_lc_send_lprime send_lprime; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->hdcp_shim; + int tries = HDCP2_LC_RETRY_CNT, ret, i; + + for (i = 0; i < tries; i++) { + ret = hdcp2_prepare_lc_init(hdcp, &msgs.lc_init); + if (ret < 0) + continue; + + ret = shim->write_2_2_msg(intel_dig_port, &msgs.lc_init, + sizeof(msgs.lc_init)); + if (ret < 0) + continue; + + ret = shim->read_2_2_msg(intel_dig_port, + HDCP_2_2_LC_SEND_LPRIME, + &msgs.send_lprime, + sizeof(msgs.send_lprime)); + if (ret < 0) + continue; + + ret = hdcp2_verify_lprime(hdcp, &msgs.send_lprime); + if (!ret) + break; + } + return ret; +} + +static int hdcp2_session_key_exchange(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + struct hdcp2_ske_send_eks send_eks; + int ret; + + ret = hdcp2_prepare_skey(hdcp, &send_eks); + if (ret < 0) + return ret; + + ret = hdcp->hdcp_shim->write_2_2_msg(intel_dig_port, &send_eks, + sizeof(send_eks)); + if (ret < 0) + return ret; + + return 0; +} + +static int hdcp2_authenticate_sink(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + const struct intel_hdcp_shim *shim = hdcp->hdcp_shim; + struct hdcp2_dp_errata_stream_type stream_type_msg; + int ret; + + ret = hdcp2_authentication_key_exchange(connector); + if (ret < 0) { + DRM_DEBUG_KMS("AKE Failed. Err : %d\n", ret); + return ret; + } + + ret = hdcp2_locality_check(connector); + if (ret < 0) { + DRM_DEBUG_KMS("Locality Check failed. Err : %d\n", ret); + return ret; + } + + ret = hdcp2_session_key_exchange(connector); + if (ret < 0) { + DRM_DEBUG_KMS("SKE Failed. Err : %d\n", ret); + return ret; + } + + if (!hdcp->is_repeater && shim->config_stream_type) { + + /* Errata for DP: As Stream type is used for encryption, + * Receiver should be communicated with stream type for the + * decryption of the content. + * Repeater will be communicated with stream type as a + * part of it's auth in later in time + */ + stream_type_msg.msg_id = HDCP_2_2_ERRATA_DP_STREAM_TYPE; + stream_type_msg.stream_type = hdcp->content_type; + + ret = shim->config_stream_type(intel_dig_port, &stream_type_msg, + sizeof(stream_type_msg)); + if (ret < 0) + return ret; + } + + hdcp->mei_data.streams[0].stream_type = hdcp->content_type; + ret = hdcp2_authenticate_port(hdcp); + if (ret < 0) + return ret; + + return ret; +}