From patchwork Wed May 19 14:12:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 12267503 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=-16.7 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=unavailable 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 A4CF5C433B4 for ; Wed, 19 May 2021 14:12:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 869E861355 for ; Wed, 19 May 2021 14:12:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347106AbhESOOM (ORCPT ); Wed, 19 May 2021 10:14:12 -0400 Received: from mga14.intel.com ([192.55.52.115]:32007 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347100AbhESOOE (ORCPT ); Wed, 19 May 2021 10:14:04 -0400 IronPort-SDR: ebQsB83jEHs8jErkUOiNb2y08EBNQGaKco8MAVDioSKOtm9emdyRlSpmJ9EGpU8KMZDR2YYLdz uBxUxE4qUQDQ== X-IronPort-AV: E=McAfee;i="6200,9189,9988"; a="200677119" X-IronPort-AV: E=Sophos;i="5.82,313,1613462400"; d="scan'208";a="200677119" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2021 07:12:44 -0700 IronPort-SDR: F7P/YX9xKFL8tR5Z6kgReDgMH7KpuLUFNrZ7mswEVfEqKMluegB0m4c0RkVUDJnV2uih/OgguZ tcetupXKo2uw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,313,1613462400"; d="scan'208";a="405607657" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga007.fm.intel.com with ESMTP; 19 May 2021 07:12:41 -0700 Received: by black.fi.intel.com (Postfix, from userid 1001) id A6DBE6C9; Wed, 19 May 2021 17:12:59 +0300 (EEST) From: Mika Westerberg To: linux-usb@vger.kernel.org Cc: Yehezkel Bernat , Michael Jamet , Andreas Noever , Lukas Wunner , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, Casey G Bowman , Rajmohan Mani , Christian Kellner , Greg Kroah-Hartman , Jonathan Corbet , Mika Westerberg Subject: [PATCH 7/9] thunderbolt: Allow router NVM authenticate separately Date: Wed, 19 May 2021 17:12:57 +0300 Message-Id: <20210519141259.84839-8-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210519141259.84839-1-mika.westerberg@linux.intel.com> References: <20210519141259.84839-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org It may be useful if the actual NVM authentication can be delayed to be run later, for instance when the user logs out. For this reason add a new NVM operation (AUHENTICATE_ONLY) that just triggers the authentication procedure over whatever was written to the NVM storage. This is not supported with Thunderbolt 1-3 devices, though. Signed-off-by: Mika Westerberg --- .../ABI/testing/sysfs-bus-thunderbolt | 5 +- drivers/thunderbolt/switch.c | 50 ++++++++++++------- drivers/thunderbolt/tb.h | 2 + drivers/thunderbolt/usb4.c | 13 ++++- 4 files changed, 49 insertions(+), 21 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt index f6743dc33aac..da580b504c87 100644 --- a/Documentation/ABI/testing/sysfs-bus-thunderbolt +++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt @@ -213,12 +213,15 @@ Description: When new NVM image is written to the non-active NVM restarted with the new NVM firmware. If the image verification fails an error code is returned instead. - This file will accept writing values "1" or "2" + This file will accept writing values "1", "2" or "3". - Writing "1" will flush the image to the storage area and authenticate the image in one action. - Writing "2" will run some basic validation on the image and flush it to the storage area. + - Writing "3" will authenticate the image that is + currently written in the storage area. This is only + supported with USB4 devices. When read holds status of the last authentication operation if an error occurred during the process. This diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index bf4821d3bbab..83b1ef3d5d03 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -303,13 +303,23 @@ static inline int nvm_read(struct tb_switch *sw, unsigned int address, return dma_port_flash_read(sw->dma_port, address, buf, size); } -static int nvm_authenticate(struct tb_switch *sw) +static int nvm_authenticate(struct tb_switch *sw, bool auth_only) { int ret; - if (tb_switch_is_usb4(sw)) + if (tb_switch_is_usb4(sw)) { + if (auth_only) { + ret = usb4_switch_nvm_set_offset(sw, 0); + if (ret) + return ret; + } + sw->nvm->authenticating = true; return usb4_switch_nvm_authenticate(sw); + } else if (auth_only) { + return -EOPNOTSUPP; + } + sw->nvm->authenticating = true; if (!tb_route(sw)) { nvm_authenticate_start_dma_port(sw); ret = nvm_authenticate_host_dma_port(sw); @@ -1713,8 +1723,7 @@ static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf, bool disconnect) { struct tb_switch *sw = tb_to_switch(dev); - int val; - int ret; + int val, ret; pm_runtime_get_sync(&sw->dev); @@ -1737,22 +1746,27 @@ static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf, nvm_clear_auth_status(sw); if (val > 0) { - if (!sw->nvm->flushed) { - if (!sw->nvm->buf) { + if (val == AUTHENTICATE_ONLY) { + if (disconnect) ret = -EINVAL; - goto exit_unlock; + else + ret = nvm_authenticate(sw, true); + } else { + if (!sw->nvm->flushed) { + if (!sw->nvm->buf) { + ret = -EINVAL; + goto exit_unlock; + } + + ret = nvm_validate_and_write(sw); + if (ret || val == WRITE_ONLY) + goto exit_unlock; } - - ret = nvm_validate_and_write(sw); - if (ret || val == WRITE_ONLY) - goto exit_unlock; - } - if (val == WRITE_AND_AUTHENTICATE) { - if (disconnect) { - ret = tb_lc_force_power(sw); - } else { - sw->nvm->authenticating = true; - ret = nvm_authenticate(sw); + if (val == WRITE_AND_AUTHENTICATE) { + if (disconnect) + ret = tb_lc_force_power(sw); + else + ret = nvm_authenticate(sw, false); } } } diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 863d80ad44ab..53f6bb85b178 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -61,6 +61,7 @@ struct tb_nvm { enum tb_nvm_write_ops { WRITE_AND_AUTHENTICATE = 1, WRITE_ONLY = 2, + AUTHENTICATE_ONLY = 3, }; #define TB_SWITCH_KEY_SIZE 32 @@ -1049,6 +1050,7 @@ int usb4_switch_set_sleep(struct tb_switch *sw); int usb4_switch_nvm_sector_size(struct tb_switch *sw); int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf, size_t size); +int usb4_switch_nvm_set_offset(struct tb_switch *sw, unsigned int address); int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address, const void *buf, size_t size); int usb4_switch_nvm_authenticate(struct tb_switch *sw); diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 8af96dbaa7a7..76d7335aa440 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -547,8 +547,17 @@ int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf, usb4_switch_nvm_read_block, sw); } -static int usb4_switch_nvm_set_offset(struct tb_switch *sw, - unsigned int address) +/** + * usb4_switch_nvm_set_offset() - Set NVM write offset + * @sw: USB4 router + * @address: Start offset + * + * Explicitly sets NVM write offset. Normally when writing to NVM this + * is done automatically by usb4_switch_nvm_write(). + * + * Returns %0 in success and negative errno if there was a failure. + */ +int usb4_switch_nvm_set_offset(struct tb_switch *sw, unsigned int address) { u32 metadata, dwaddress; u8 status = 0;