From patchwork Mon Feb 19 18:07:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aishwarya Pant X-Patchwork-Id: 10228465 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B5C7B60467 for ; Mon, 19 Feb 2018 18:08:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A30A128767 for ; Mon, 19 Feb 2018 18:08:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 97BE328809; Mon, 19 Feb 2018 18:08:04 +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=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7B5928776 for ; Mon, 19 Feb 2018 18:08:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753326AbeBSSID (ORCPT ); Mon, 19 Feb 2018 13:08:03 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:43920 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753185AbeBSSIC (ORCPT ); Mon, 19 Feb 2018 13:08:02 -0500 Received: by mail-pg0-f65.google.com with SMTP id f6so6136646pgs.10; Mon, 19 Feb 2018 10:08:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=QK3mubLKchAa4MdgV4FqqpURkY6EBLj0RRB22A8dv0M=; b=Z4/hicmu4Lh11q53AaRn/IPRPLz/+CUHvPsdr7GmtInvtzV5JsuV3Lw4h5uojzLaIK DVJ0DRkhwFtd1Ihtefopy8ygoKOdg8jCHWC48/ql7bRGnXDn0pECgr1Ax40/bPOZ2CqJ v44STI/+iOukmTeZlRx4ur727k7s53bQ+Ft6AIEf+gj70jmAPqoxG0o8htW1P0TeKeFv YmrKkQvVBYRTuGIbU6tLNea8JKR6f6apCZHBW2dUvIqTOJgAShZUmV68fLQmV0qVcm9n mIJzU1iV7NMWZIl+wGJ1ECUyR7ELnORhJhTqkPYPOSI+1jUuCURKYtc9WXvVqhX65xFS OOCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=QK3mubLKchAa4MdgV4FqqpURkY6EBLj0RRB22A8dv0M=; b=XV7/i5RWfXsWWTqMxC1/a7YxHVX+61EQLtVwCwsGXmlKVFTiRfj0mWBvAhIoLDBrOB VwMn58OtMKFTFXeWeu9JWPbuetUUITcfd8YpFrVDQofgCwL0eRTeuUSMsk84/Tn6FfMZ DMNgBWMF+jHS6mVtPX3aOnc8KDh7/7B+fcGCcY6CbqHDkaS8/7wnh4+xAempVEO7LmP0 i8Pa9Wt/fXqJJS2RS5WPD7K/wLVxxDV8K4lNq+2OKt4Braciom/36w12IGIV57mg/pJR i+IGTkkYVJVyJhjPqHAK0Xl8HeSsqwcMEMXlP3HzR/nPQCzH2Ypqx4njcRIRsS4PY32D KAhw== X-Gm-Message-State: APf1xPDxWuDXHW2gjj/xA+r+KiPyGnHnHNuf2A1aG/YHxIhyv0ZRTUjG /uyXNNpwvcrWUF9U0tfUGjg= X-Google-Smtp-Source: AH8x224WhFJg25TIoGODUuauBeYJExz06JWECxEaTaUcxD8gji6psnvQQZcR7edDSYE9J8GWGfU/Yw== X-Received: by 10.99.100.196 with SMTP id y187mr13091197pgb.362.1519063681180; Mon, 19 Feb 2018 10:08:01 -0800 (PST) Received: from mordor.localdomain ([183.82.19.191]) by smtp.gmail.com with ESMTPSA id 6sm18142834pfh.96.2018.02.19.10.07.57 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 19 Feb 2018 10:08:00 -0800 (PST) Date: Mon, 19 Feb 2018 23:37:54 +0530 From: Aishwarya Pant To: Dan Williams , "Rafael J. Wysocki" , Len Brown , linux-nvdimm@lists.01.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Corbet , Greg KH Cc: Julia Lawall Subject: [PATCH] acpi: nfit: document sysfs interface Message-ID: <20180219180754.GA31007@mordor.localdomain> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.3 (2018-01-21) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is an attempt to document the nfit sysfs interface. The descriptions have been collected from git commit logs and the ACPI specification 6.2. There are still two undocumented attributes- range_index and ecc_unit_size, for which I couldn't collect complete information. Signed-off-by: Aishwarya Pant --- Documentation/ABI/testing/sysfs-bus-nfit | 202 +++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-nfit diff --git a/Documentation/ABI/testing/sysfs-bus-nfit b/Documentation/ABI/testing/sysfs-bus-nfit new file mode 100644 index 000000000000..758d8d0d4c37 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-nfit @@ -0,0 +1,202 @@ +What: /sys/bus/nd/devices/nmemX/nfit/serial +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Serial number of the NVDIMM (non-volatile dual in-line + memory module), assigned by the module vendor. + + +What: /sys/bus/nd/devices/nmemX/nfit/handle +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) The address (given by the _ADR object) of the device on its + parent bus of the NVDIMM device containing the NVDIMM region. + + +What: /sys/bus/nd/devices/nmemX/nfit/device +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Identifier for the NVDIMM, assigned by the module vendor. + + +What: /sys/bus/nd/devices/nmemX/nfit/rev_id +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Revision of the NVDIMM, assigned by the module vendor. + + +What: /sys/bus/nd/devices/nmemX/nfit/phys_id +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Handle (i.e., instance number) for the SMBIOS (system + management BIOS) Memory Device structure describing the NVDIMM + containing the NVDIMM region. + + +What: /sys/bus/nd/devices/nmemX/nfit/flags +Date: Jun, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) The flags in the NFIT memory device sub-structure indicate + the state of the data on the nvdimm relative to its energy + source or last "flush to persistence". + + The attribute is a translation of the 'NVDIMM State Flags' field + in section 5.2.25.3 'NVDIMM Region Mapping' Structure of the + ACPI specification 6.2. + + The health states are "save_fail", "restore_fail", "flush_fail", + "not_armed", "smart_event", "map_fail" and "smart_notify". + + +What: /sys/bus/nd/devices/nmemX/nfit/format +What: /sys/bus/nd/devices/nmemX/nfit/format1 +What: /sys/bus/nd/devices/nmemX/nfit/formats +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Identifiers for the programming interface. Starting with + ACPI 6.1 an NFIT table reports multiple 'NVDIMM Control Region + Structure' instances per-dimm, one for each supported format + interface. That code is represented in the sysfs as follows: + nmemX/nfit/formats, nmemX/nfit/format, nmemX/nfit/format1, + nmemX/nfit/format2 ... nmemX/nfit/formatN, where format2 - + formatN are theoretical as there are no known DIMMs with support + for more than two interface formats. The 'formats' attribute + displays the number of supported interfaces. + + This layout is compatible with existing libndctl binaries that + only expect one code per-dimm as they will ignore + nmemX/nfit/formats and nmemX/nfit/formatN. + + +What: /sys/bus/nd/devices/nmemX/nfit/vendor +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Identifier indicating the vendor of the NVDIMM. + + +What: /sys/bus/nd/devices/nmemX/nfit/dsm_mask +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) The bitmask indicates the supported device specific control + functions. + + +What: /sys/bus/nd/devices/nmemX/nfit/family +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Displays the NVDIMM family (and the command sets). Values + 0, 1, 2 and 3 correspond to NVDIMM_FAMILY_INTEL, + NVDIMM_FAMILY_HPE1, NVDIMM_FAMILY_HPE2 and NVDIMM_FAMILY_MSFT + respectively. + + +What: /sys/bus/nd/devices/nmemX/nfit/id +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) ACPI specification 6.2 section 5.2.25.9, defines an + identifier for an NVDIMM, which refelects the id attribute. + + If the manufacturing location and manufacturing date fields are + valid, then 'id' is composed of the vendor id (bytes 0-1), + manufacturing location byte, manufacturing date (bytes 0-1) and + the serial number(bytes 0-3), otherwise it is composed of vendor + id (bytes 0-1) and serial number (bytes 0-3) + + +What: /sys/bus/nd/devices/nmemX/nfit/subsystem_vendor +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Vendor of the NVDIMM non-volatile memory subsystem + controller. + + +What: /sys/bus/nd/devices/nmemX/nfit/subsystem_rev_id +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Revision of the NVDIMM non-volatile memory subsystem + controller, assigned by the non-volatile memory subsystem + controller vendor. + + +What: /sys/bus/nd/devices/nmemX/nfit/subsystem_device +Date: Apr, 2016 +KernelVersion: v4.6 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) Identifier for the NVDIMM non-volatile memory subsystem + controller, assigned by the non-volatile memory subsystem + controller vendor. + + +What: /sys/bus/nd/devices/ndbusX/nfit/revision +Date: Apr, 2015 +KernelVersion: v4.1 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) ACPI Specification minor version number. + + +What: /sys/bus/nd/devices/ndbusX/nfit/scrub +Date: Sep, 2016 +KernelVersion: v4.8 +Contact: linux-nvdimm@lists.01.org +Description: + (RW) This shows the number of full Address Range Scrubs (ARS) + that have been completed since driver load time. Userspace can + wait on this using select/poll etc. A '+' at the end indicates + an ARS is in progress + + Writing a value of 1 triggers an ARS scan. + + +What: /sys/bus/nd/devices/ndbusX/nfit/hw_error_scrub +Date: Sep, 2016 +KernelVersion: v4.8 +Contact: linux-nvdimm@lists.01.org +Description: + (RW) Provides a way to toggle the behavior between just adding + the address (cache line) where the MCE happened to the poison + list and doing a full scrub. The former (selective insertion of + the address) is done unconditionally. + + This attribute can have the following values written to it: + + '0': Switch to the default mode where an exception will only + insert the address of the memory error into the poison and + badblocks lists. + '1': Enable a full scrub to happen if an exception for a memory + error is received. + + +What: /sys/bus/nd/devices/ndbusX/nfit/dsm_mask +Date: Jun, 2017 +KernelVersion: v4.12 +Contact: linux-nvdimm@lists.01.org +Description: + (RO) The bitmask indicates the supported bus specific control + functions.