From nobody Mon Apr 6 14:57:32 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29621C433F5 for ; Mon, 3 Oct 2022 14:24:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229954AbiJCOYN (ORCPT ); Mon, 3 Oct 2022 10:24:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229589AbiJCOYK (ORCPT ); Mon, 3 Oct 2022 10:24:10 -0400 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7196C4A83F for ; Mon, 3 Oct 2022 07:24:08 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id u10so16870847wrq.2 for ; Mon, 03 Oct 2022 07:24:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=6yOJHVQ3dF73qxDimMRkk9B34BzBwv1cpVNfV2MLrsA=; b=D9VGZTan1HL2NIWYEqPV2MPHUHWl81EulVPIktGGwvrlNcXQuQH4G2frhfNd1tGb4F 22Q96g2FaXwx0G5xNeQzRYltqOhIy7UPWmqmsAowrlboOrKS39XO9Rhn75I13Bt3fnG0 iwZYN0sL69kTrHcIznx/VhLP6gUHfJCzfuiNisjdRQUEyUOMnyJxUJkUrD9acim8KCnh vDJM+dBmXxFd8h+d5Da4nVvuUVLZYb1qsYXAzwsNBXEiIJf/hCJE3H7qX4chaa3EGs3r sYOjmLrtuCzWqpZ4Y6Max1r0QCMYIuGusgzTVw9wOqVUEKeGWBeuAr18f3dFatp4gKke Vh+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=6yOJHVQ3dF73qxDimMRkk9B34BzBwv1cpVNfV2MLrsA=; b=uqKPQPUwwnew6boJUIOn9tqDRc2tlE/JJocs1xc6Mc+WfZZD1sewNk8f1l9vMPwlu+ lbCJ4THgoUIQcxbeBBdWxMD+NzbU4jWNFEvk4E9bHRZ9ApzYjlcozhq4D2cmuABZPOGU PYydqRw0oI6MqKyKi378MbFTOScvq9H0nst5OGmXb3WXwtmY7FREY7Ld7wyavB1fUaWx p+JS3RMEdNXpI+OfF7SnWcCwZtIEp213JgpfMegUpgWrJk3yfhvbtGaEzYpg3Ywu94Jd C3lCMzPLeo7s/z8t3C0qYDOJi1K2nXmDEdrvKy/lpIBgMDgCi9x/2snU3Hf3zhcaBGQd FHCA== X-Gm-Message-State: ACrzQf2+1JiP7N6a/Po6HVrbBkw14V/HqffVCCbZrUPyr3Ps8H5UbD+P n8a79p+c/G4G8ooPKFFeXQA= X-Google-Smtp-Source: AMsMyM7uqbc7RW5xeRcAfk7cKCI8R5NYd3ZfGLDER7qgW/fVasGj2RGSRHTUUJy3b/CRChR3fR/MrA== X-Received: by 2002:a5d:47a4:0:b0:226:e547:b602 with SMTP id 4-20020a5d47a4000000b00226e547b602mr13584509wrb.406.1664807046827; Mon, 03 Oct 2022 07:24:06 -0700 (PDT) Received: from laptop.crto.in ([2a01:e0a:b14:c1f0:8b27:f5b6:ab16:4a19]) by smtp.gmail.com with ESMTPSA id bg33-20020a05600c3ca100b003a5f4fccd4asm17436086wmb.35.2022.10.03.07.24.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 07:24:06 -0700 (PDT) From: Erwan Velu X-Google-Original-From: Erwan Velu Cc: erwanaliasr1@gmail.com, Erwan Velu , Jean Delvare , linux-kernel@vger.kernel.org Subject: [PATCH] firmware/dmi: Print product serial number if any Date: Mon, 3 Oct 2022 16:24:00 +0200 Message-Id: <20221003142400.1177057-1-e.velu@criteo.com> X-Mailer: git-send-email 2.37.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" During the boot sequence, the kernel prints a string to identify the running host. This is pretty handy to estimate the underlying hardware in case of early crash. This patch add the product serial number in this reporting if any got found, or keep the current string. In a large fleet of servers, this information could be useful to identify the host that generated a given tra= ce. Test ran with the following command : qemu-system-x86_64 -kernel arch/x86/b= oot/bzImage --enable-kvm -m 512 -serial stdio -append 'console=3DttyS0' -= smbios type=3D1,serial=3DR90YT7WC Prior the patch: [ 0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.f= c36 04/01/2014 With the patch: [ 0.000000] DMI: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.f= c36 04/01/2014, SN: R90YT7WC Signed-off-by: Erwan Velu --- drivers/firmware/dmi_scan.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index 0eb6b617f709..601e003c67f4 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -536,6 +536,7 @@ static void __init dmi_format_ids(char *buf, size_t len) { int c =3D 0; const char *board; /* Board Name is optional */ + const char *product_serial; /* Product serial is optional */ =20 c +=3D print_filtered(buf + c, len - c, dmi_get_system_info(DMI_SYS_VENDOR)); @@ -554,6 +555,14 @@ static void __init dmi_format_ids(char *buf, size_t le= n) c +=3D scnprintf(buf + c, len - c, " "); c +=3D print_filtered(buf + c, len - c, dmi_get_system_info(DMI_BIOS_DATE)); + + product_serial =3D dmi_get_system_info(DMI_PRODUCT_SERIAL); + if (product_serial) { + if (strlen(product_serial)) { + c +=3D scnprintf(buf + c, len - c, ", SN: "); + c +=3D print_filtered(buf + c, len - c, product_serial); + } + } } =20 /* --=20 2.37.3