From patchwork Thu Sep 27 06:55:03 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10617385 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7BDEA175A for ; Thu, 27 Sep 2018 06:59:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6AF002B076 for ; Thu, 27 Sep 2018 06:59:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5E5BF2B07A; Thu, 27 Sep 2018 06:59:43 +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=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=unavailable 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 E34CC2B076 for ; Thu, 27 Sep 2018 06:59:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 684136E513; Thu, 27 Sep 2018 06:58:31 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3DAF66E4FC; Thu, 27 Sep 2018 06:58:21 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Sep 2018 23:58:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,309,1534834800"; d="scan'208";a="95204728" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by orsmga002.jf.intel.com with ESMTP; 26 Sep 2018 23:58:18 -0700 From: Ramalingam C To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, daniel@ffwll.ch, tomas.winkler@intel.com Subject: [PATCH v7 12/39] drm/i915: Implement HDCP2.2 repeater authentication Date: Thu, 27 Sep 2018 12:25:03 +0530 Message-Id: <1538031330-21040-13-git-send-email-ramalingam.c@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1538031330-21040-1-git-send-email-ramalingam.c@intel.com> References: <1538031330-21040-1-git-send-email-ramalingam.c@intel.com> 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 MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Implements the HDCP2.2 repeaters authentication steps such as verifying the downstream topology and sending stream management information. v2: Rebased. v3: No Changes. v4: -EINVAL is returned for topology error and rollover scenario. Endianness conversion func from drm_hdcp.h is used [Uma] v5: Rebased as part of patches reordering. Defined the mei service functions [Daniel] v6: Redefined the mei service functions as per comp redesign. v7: %s/uintxx_t/uxx Check for comp_master is removed. Signed-off-by: Ramalingam C --- drivers/gpu/drm/i915/intel_hdcp.c | 165 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_hdcp.h | 15 ++++ 2 files changed, 180 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 9791b4fd4495..3772db5d4171 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -1002,6 +1002,50 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, return ret; } +static int +hdcp2_verify_rep_topology_prepare_ack( + struct intel_connector *connector, + struct hdcp2_rep_send_receiverid_list *rep_topology, + struct hdcp2_rep_send_ack *rep_send_ack) +{ + struct mei_hdcp_data *data = &connector->hdcp.mei_data; + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct i915_component_master *comp = dev_priv->comp_master; + int ret; + + if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT) + return -EINVAL; + + ret = comp->hdcp_ops->repeater_check_flow_prepare_ack(comp->mei_cldev, + data, + rep_topology, + rep_send_ack); + if (ret < 0) + comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data); + + return ret; +} + +static int +hdcp2_verify_mprime(struct intel_connector *connector, + struct hdcp2_rep_stream_ready *stream_ready) +{ + struct mei_hdcp_data *data = &connector->hdcp.mei_data; + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct i915_component_master *comp = dev_priv->comp_master; + int ret; + + if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT) + return -EINVAL; + + ret = comp->hdcp_ops->verify_mprime(comp->mei_cldev, data, + stream_ready); + if (ret < 0) + comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data); + + return ret; +} + static int hdcp2_authenticate_port(struct intel_connector *connector) { struct mei_hdcp_data *data = &connector->hdcp.mei_data; @@ -1171,6 +1215,121 @@ static int hdcp2_session_key_exchange(struct intel_connector *connector) return 0; } +static +int hdcp2_propagate_stream_management_info(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_rep_stream_manage stream_manage; + struct hdcp2_rep_stream_ready stream_ready; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + int ret; + + /* Prepare RepeaterAuth_Stream_Manage msg */ + msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; + reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN, + (u8 *)&hdcp->seq_num_m); + + /* K no of streams is fixed as 1. Stored as big-endian. */ + msgs.stream_manage.k = __swab16(1); + + /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ + msgs.stream_manage.streams[0].stream_id = 0; + msgs.stream_manage.streams[0].stream_type = hdcp->content_type; + + /* Send it to Repeater */ + ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, + sizeof(msgs.stream_manage)); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, + &msgs.stream_ready, sizeof(msgs.stream_ready)); + if (ret < 0) + return ret; + + hdcp->mei_data.seq_num_m = hdcp->seq_num_m; + hdcp->mei_data.streams[0].stream_type = hdcp->content_type; + + ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); + if (ret < 0) + return ret; + + hdcp->seq_num_m++; + + if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { + DRM_DEBUG_KMS("seq_num_m roll over.\n"); + return -1; + } + + return 0; +} + +static +int hdcp2_authenticate_repeater_topology(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_rep_send_receiverid_list recvid_list; + struct hdcp2_rep_send_ack rep_ack; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + u8 *rx_info; + u32 seq_num_v; + int ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_SEND_RECVID_LIST, + &msgs.recvid_list, sizeof(msgs.recvid_list)); + if (ret < 0) + return ret; + + rx_info = msgs.recvid_list.rx_info; + + if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) || + HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) { + DRM_DEBUG_KMS("Topology Max Size Exceeded\n"); + return -EINVAL; + } + + /* Converting and Storing the seq_num_v to local variable as DWORD */ + reverse_endianness((u8 *)&seq_num_v, HDCP_2_2_SEQ_NUM_LEN, + msgs.recvid_list.seq_num_v); + + if (seq_num_v < hdcp->seq_num_v) { + /* Roll over of the seq_num_v from repeater. Reauthenticate. */ + DRM_DEBUG_KMS("Seq_num_v roll over.\n"); + return -EINVAL; + } + + ret = hdcp2_verify_rep_topology_prepare_ack(connector, + &msgs.recvid_list, + &msgs.rep_ack); + if (ret < 0) + return ret; + + hdcp->seq_num_v = seq_num_v; + ret = shim->write_2_2_msg(intel_dig_port, &msgs.rep_ack, + sizeof(msgs.rep_ack)); + if (ret < 0) + return ret; + + return 0; +} + +static int hdcp2_authenticate_repeater(struct intel_connector *connector) +{ + int ret; + + ret = hdcp2_authenticate_repeater_topology(connector); + if (ret < 0) + return ret; + + return hdcp2_propagate_stream_management_info(connector); +} + static int hdcp2_authenticate_sink(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); @@ -1212,6 +1371,12 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) sizeof(stream_type_msg)); if (ret < 0) return ret; + } else if (hdcp->is_repeater) { + ret = hdcp2_authenticate_repeater(connector); + if (ret < 0) { + DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); + return ret; + } } hdcp->mei_data.streams[0].stream_type = hdcp->content_type; diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index d54b0f2610d7..92e616778473 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -250,4 +250,19 @@ struct hdcp2_dp_errata_stream_type { #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) +/* + * Library functions for endianness are aligned for 16/32/64 bits. + * But hdcp sequence numbers are 24bits. So for their Byte swapping, + * a conversion function is developed. + */ +static inline void reverse_endianness(u8 *dest, size_t sz, u8 *src) +{ + u32 index; + + if (!sz || sz > sizeof(u32)) + return; + for (index = 0; index < sz; index++) + dest[sz - index - 1] = src[index]; +} + #endif