From patchwork Fri Jan 29 08:32:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 373640 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E294AC433E9 for ; Fri, 29 Jan 2021 11:54:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC30065014 for ; Fri, 29 Jan 2021 11:54:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232261AbhA2Ly2 (ORCPT ); Fri, 29 Jan 2021 06:54:28 -0500 Received: from mga14.intel.com ([192.55.52.115]:19271 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232109AbhA2K0S (ORCPT ); Fri, 29 Jan 2021 05:26:18 -0500 IronPort-SDR: pkrHSNmBuJDJGvPEjaWzjSymThCU/x1/wFHt6espIElXApWdcrX9LJUH+sADir6WQU5ML35kxI g0TVn3+5z0MQ== X-IronPort-AV: E=McAfee;i="6000,8403,9878"; a="179606838" X-IronPort-AV: E=Sophos;i="5.79,385,1602572400"; d="scan'208";a="179606838" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jan 2021 00:32:46 -0800 IronPort-SDR: utZ0SjJOclrME2v02nVNELV19iZ+n05EkDwphomRpzn+S1QGsIQ7nGaAQhIrvjY7cS3xXyOu+r NabEQYuh367w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,385,1602572400"; d="scan'208";a="575444604" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga006.fm.intel.com with ESMTP; 29 Jan 2021 00:32:42 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id AE5302534; Fri, 29 Jan 2021 10:32:41 +0200 (EET) From: Mika Westerberg To: linux-usb@vger.kernel.org Cc: Yehezkel Bernat , Michael Jamet , Andreas Noever , Lukas Wunner , Mario Limonciello , "Rafael J. Wysocki" , Christian Kellner , Len Brown , Greg Kroah-Hartman , Mika Westerberg , linux-acpi@vger.kernel.org Subject: [PATCH v2 2/5] thunderbolt: Allow disabling XDomain protocol Date: Fri, 29 Jan 2021 11:32:38 +0300 Message-Id: <20210129083241.72497-3-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210129083241.72497-1-mika.westerberg@linux.intel.com> References: <20210129083241.72497-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This allows disabling XDomain protocol completely if the user does not plan to use the USB4/Thunderbolt peer-to-peer functionality, or for security reasons. XDomain protocol is enabled by default but with this commit it is possible to disable it by passing "xdomain=0" as module parameter (or through the kernel command line). Signed-off-by: Mika Westerberg Acked-by: Yehezkel Bernat --- drivers/thunderbolt/domain.c | 4 +++- drivers/thunderbolt/icm.c | 6 ++++-- drivers/thunderbolt/tb.c | 3 +++ drivers/thunderbolt/tb.h | 1 + drivers/thunderbolt/xdomain.c | 9 +++++++++ 5 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c index a1c79c9c4f66..89ae614eaba2 100644 --- a/drivers/thunderbolt/domain.c +++ b/drivers/thunderbolt/domain.c @@ -412,7 +412,9 @@ static bool tb_domain_event_cb(void *data, enum tb_cfg_pkg_type type, switch (type) { case TB_CFG_PKG_XDOMAIN_REQ: case TB_CFG_PKG_XDOMAIN_RESP: - return tb_xdomain_handle_request(tb, type, buf, size); + if (tb_is_xdomain_enabled()) + return tb_xdomain_handle_request(tb, type, buf, size); + break; default: tb->cm_ops->handle_event(tb, type, buf, size); diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c index 14340ec61703..8cd7b3054d14 100644 --- a/drivers/thunderbolt/icm.c +++ b/drivers/thunderbolt/icm.c @@ -1701,10 +1701,12 @@ static void icm_handle_notification(struct work_struct *work) icm->device_disconnected(tb, n->pkg); break; case ICM_EVENT_XDOMAIN_CONNECTED: - icm->xdomain_connected(tb, n->pkg); + if (tb_is_xdomain_enabled()) + icm->xdomain_connected(tb, n->pkg); break; case ICM_EVENT_XDOMAIN_DISCONNECTED: - icm->xdomain_disconnected(tb, n->pkg); + if (tb_is_xdomain_enabled()) + icm->xdomain_disconnected(tb, n->pkg); break; case ICM_EVENT_RTD3_VETO: icm->rtd3_veto(tb, n->pkg); diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 413955aa6a94..ad3c285026d5 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -179,6 +179,9 @@ static void tb_scan_xdomain(struct tb_port *port) struct tb_xdomain *xd; u64 route; + if (!tb_is_xdomain_enabled()) + return; + route = tb_downstream_route(port); xd = tb_xdomain_find_by_route(tb, route); if (xd) { diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 31468de658e4..01fe849e9d4c 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -953,6 +953,7 @@ static inline u64 tb_downstream_route(struct tb_port *port) | ((u64) port->port << (port->sw->config.depth * 8)); } +bool tb_is_xdomain_enabled(void); bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type, const void *buf, size_t size); struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent, diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c index 6e8bea6a7d39..b242161868c2 100644 --- a/drivers/thunderbolt/xdomain.c +++ b/drivers/thunderbolt/xdomain.c @@ -30,6 +30,10 @@ struct xdomain_request_work { struct tb *tb; }; +static bool tb_xdomain_enabled = true; +module_param_named(xdomain, tb_xdomain_enabled, bool, 0444); +MODULE_PARM_DESC(xdomain, "allow XDomain protocol (default: true)"); + /* Serializes access to the properties and protocol handlers below */ static DEFINE_MUTEX(xdomain_lock); @@ -47,6 +51,11 @@ static const uuid_t tb_xdp_uuid = UUID_INIT(0xb638d70e, 0x42ff, 0x40bb, 0x97, 0xc2, 0x90, 0xe2, 0xc0, 0xb2, 0xff, 0x07); +bool tb_is_xdomain_enabled(void) +{ + return tb_xdomain_enabled; +} + static bool tb_xdomain_match(const struct tb_cfg_request *req, const struct ctl_pkg *pkg) {