From nobody Sun Feb 8 08:48:01 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 50654C76195 for ; Wed, 22 Mar 2023 19:13:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230093AbjCVTNz (ORCPT ); Wed, 22 Mar 2023 15:13:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229529AbjCVTNx (ORCPT ); Wed, 22 Mar 2023 15:13:53 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37D2C4AFF8; Wed, 22 Mar 2023 12:13:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679512431; x=1711048431; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=ptLcWk9srDFCxKrQ2KuZ2G9eHwppFRvlMA0y7UxLp98=; b=d67NLz1KfVVsT4bDqhm9aO6WAzMfZn3W49Q6h0dzRSPDt3GpGy/6YDx+ 6mCJKA/lwBzyzGH5RWhqTAMfA6gQD7TzXO3dvbx54gwqoIzT1Tnni7ofF x6QdLtZXfcCuG1v35vXc/oY8n0oo74auDub3pXMg8M369+k6ffe+CuvIK J39EdMo61u5rZRs+dYE5szotfMqZQWIIeu5MCo5++8HoJ7/+l9MOAPpsn 5d4Ns2mfiQzs8VSGyWwuHeO7/q/Sa8wXdBGQR03DKSTdftUhycF9Uas9/ 67+9CVUxBSRx47dYB3V1B8Khfahwq712TkS0Hx/Ls1WT4kH00OAqiYC9K g==; X-IronPort-AV: E=McAfee;i="6600,9927,10657"; a="401881514" X-IronPort-AV: E=Sophos;i="5.98,282,1673942400"; d="scan'208";a="401881514" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2023 12:13:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10657"; a="682025126" X-IronPort-AV: E=Sophos;i="5.98,282,1673942400"; d="scan'208";a="682025126" Received: from rfbarbee-mobl.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.251.1.54]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Mar 2023 12:13:50 -0700 From: Kuppuswamy Sathyanarayanan To: Rafael J Wysocki Cc: Len Brown , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Kuppuswamy Sathyanarayanan Subject: [PATCH v3] ACPI: sysfs: Enable ACPI sysfs support for CCEL records Date: Wed, 22 Mar 2023 12:13:13 -0700 Message-Id: <20230322191313.22804-1-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The Confidential Computing Event Log (CCEL) table provides the address and length of the CCEL records area in UEFI reserved memory. To allow user space access to these records, expose a sysfs interface similar to the BERT table. More details about the CCEL table can be found in the ACPI specification r6.5 [1], sec 5.2.34. Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.ht= ml#cc-event-log-acpi-table # [1] Co-developed-by: Haibo Xu Signed-off-by: Haibo Xu Signed-off-by: Kuppuswamy Sathyanarayanan --- Changes since v2: * Fixed the commit log as per review suggestion. Changes since v1: * Removed unnecessary parenthesis as per Rafael's suggestion. drivers/acpi/sysfs.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c index 7f4ff56c9d42..687524b50085 100644 --- a/drivers/acpi/sysfs.c +++ b/drivers/acpi/sysfs.c @@ -458,11 +458,28 @@ static int acpi_bert_data_init(void *th, struct acpi_= data_attr *data_attr) return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); } =20 +static int acpi_ccel_data_init(void *th, struct acpi_data_attr *data_attr) +{ + struct acpi_table_ccel *ccel =3D th; + + if (ccel->header.length < sizeof(struct acpi_table_ccel) || + !ccel->log_area_start_address || !ccel->log_area_minimum_length) { + kfree(data_attr); + return -EINVAL; + } + data_attr->addr =3D ccel->log_area_start_address; + data_attr->attr.size =3D ccel->log_area_minimum_length; + data_attr->attr.attr.name =3D "CCEL"; + + return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); +} + static struct acpi_data_obj { char *name; int (*fn)(void *, struct acpi_data_attr *); } acpi_data_objs[] =3D { { ACPI_SIG_BERT, acpi_bert_data_init }, + { ACPI_SIG_CCEL, acpi_ccel_data_init }, }; =20 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs) --=20 2.34.1