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Message-ID: <20180219180754.GA31007@mordor.localdomain>
Date: Mon, 19 Feb 2018 23:37:54 +0530
From: Aishwarya Pant <aishpant@...il.com>
To: Dan Williams <dan.j.williams@...el.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>, linux-nvdimm@...ts.01.org,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
Jonathan Corbet <corbet@....net>,
Greg KH <gregkh@...uxfoundation.org>
Cc: Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH] acpi: nfit: document sysfs interface
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 <aishpant@...il.com>
---
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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.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@...ts.01.org
+Description:
+ (RO) The bitmask indicates the supported bus specific control
+ functions.
--
2.16.1
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