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Merge tag 'docs-4.17' of git://git.lwn.net/linux

Browse Source 
Pull documentation updates from Jonathan Corbet:
 "There's been a fair amount of activity in Documentation/ this time
  around:

   - Lots of work aligning Documentation/ABI with reality, done by
     Aishwarya Pant.

   - The trace documentation has been converted to RST by Changbin Du

   - I thrashed up kernel-doc to deal with a parsing issue and to try to
     make the code more readable. It's still a 20+-year-old Perl hack,
     though.

   - Lots of other updates, typo fixes, and more"

* tag 'docs-4.17' of git://git.lwn.net/linux: (82 commits)
  Documentation/process: update FUSE project website
  docs: kernel-doc: fix parsing of arrays
  dmaengine: Fix spelling for parenthesis in dmatest documentation
  dmaengine: Make dmatest.rst indeed reST compatible
  dmaengine: Add note to dmatest documentation about supported channels
  Documentation: magic-numbers: Fix typo
  Documentation: admin-guide: add kvmconfig, xenconfig and tinyconfig commands
  Input: alps - Update documentation for trackstick v3 format
  Documentation: Mention why %p prints ptrval
  COPYING: use the new text with points to the license files
  COPYING: create a new file with points to the Kernel license files
  Input: trackpoint: document sysfs interface
  xfs: Change URL for the project in xfs.txt
  char/bsr: add sysfs interface documentation
  acpi: nfit: document sysfs interface
  block: rbd: update sysfs interface
  Documentation/sparse: fix typo
  Documentation/CodingStyle: Add an example for braces
  docs/vm: update 00-INDEX
  kernel-doc: Remove __sched markings
  ...
This commit is contained in:
Linus Torvalds
2018-04-03 13:35:51 -07:00
parent e40dc66220 86afad7d87
commit bb2407a721
62 changed files with 6867 additions and 5419 deletions
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45
Documentation/ABI/testing/sysfs-block-aoe Normal file
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What: /sys/block/etherd*/mac
Date: Apr, 2005
KernelVersion: v2.6.12
Contact: Ed L. Cashin <ed.cashin@acm.org>
Description:
(RO) The ethernet address of the remote Ata over Ethernet (AoE)
device.
What: /sys/block/etherd*/netif
Date: Apr, 2005
KernelVersion: v2.6.12
Contact: Ed L. Cashin <ed.cashin@acm.org>
Description:
(RO) The names of the network interfaces on the localhost (comma
separated) through which we are communicating with the remote
AoE device.
What: /sys/block/etherd*/state
Date: Apr, 2005
KernelVersion: v2.6.12
Contact: Ed L. Cashin <ed.cashin@acm.org>
Description:
(RO) Device status. The state attribute is "up" when the device
is ready for I/O and "down" if detected but unusable. The
"down,closewait" state shows that the device is still open and
cannot come up again until it has been closed. The "up,kickme"
state means that the driver wants to send more commands to the
target but found out there were already the max number of
commands waiting for a response. It will retry again after being
kicked by the periodic timer handler routine.
What: /sys/block/etherd*/firmware-version
Date: Apr, 2005
KernelVersion: v2.6.12
Contact: Ed L. Cashin <ed.cashin@acm.org>
Description:
(RO) Version of the firmware in the target.
What: /sys/block/etherd*/payload
Date: Dec, 2012
KernelVersion: v3.10
Contact: Ed L. Cashin <ed.cashin@acm.org>
Description:
(RO) The amount of user data transferred (in bytes) inside each AoE
command on the network, network headers excluded.

50
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What: /sys/block/loopX/loop/autoclear
Date: Aug, 2010
KernelVersion: v2.6.37
Contact: linux-block@vger.kernel.org
Description:
(RO) Shows if the device is in autoclear mode or not ( "1" or
"0"). Autoclear (if set) indicates that the loopback device will
self-distruct after last close.
What: /sys/block/loopX/loop/backing_file
Date: Aug, 2010
KernelVersion: v2.6.37
Contact: linux-block@vger.kernel.org
Description:
(RO) The path of the backing file that the loop device maps its
data blocks to.
What: /sys/block/loopX/loop/offset
Date: Aug, 2010
KernelVersion: v2.6.37
Contact: linux-block@vger.kernel.org
Description:
(RO) Start offset (in bytes).
What: /sys/block/loopX/loop/sizelimit
Date: Aug, 2010
KernelVersion: v2.6.37
Contact: linux-block@vger.kernel.org
Description:
(RO) The size (in bytes) that the block device maps, starting
from the offset.
What: /sys/block/loopX/loop/partscan
Date: Aug, 2011
KernelVersion: v3.10
Contact: linux-block@vger.kernel.org
Description:
(RO) Shows if automatic partition scanning is enabled for the
device or not ("1" or "0"). This can be requested individually
per loop device during its setup by setting LO_FLAGS_PARTSCAN in
in the ioctl request. By default, no partition tables are
scanned.
What: /sys/block/loopX/loop/dio
Date: Aug, 2015
KernelVersion: v4.10
Contact: linux-block@vger.kernel.org
Description:
(RO) Shows if direct IO is being used to access backing file or
not ("1 or "0").

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For all of the nmem device attributes under nfit/*, see the 'NVDIMM Firmware
Interface Table (NFIT)' section in the ACPI specification
(http://www.uefi.org/specifications) for more details.
What: /sys/bus/nd/devices/nmemX/nfit/serial
Date: Jun, 2015
KernelVersion: v4.2
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: v4.2
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) Device id for the NVDIMM, assigned by the module vendor.
What: /sys/bus/nd/devices/nmemX/nfit/rev_id
Date: Jun, 2015
KernelVersion: v4.2
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: v4.2
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: v4.2
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: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) The interface codes indicate support for persistent memory
mapped directly into system physical address space and / or a
block aperture access mechanism to the NVDIMM media.
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: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Vendor id of the NVDIMM.
What: /sys/bus/nd/devices/nmemX/nfit/dsm_mask
Date: May, 2016
KernelVersion: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) The bitmask indicates the supported device specific control
functions relative to the NVDIMM command family supported by the
device
What: /sys/bus/nd/devices/nmemX/nfit/family
Date: Apr, 2016
KernelVersion: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Displays the NVDIMM family command sets. Values
0, 1, 2 and 3 correspond to NVDIMM_FAMILY_INTEL,
NVDIMM_FAMILY_HPE1, NVDIMM_FAMILY_HPE2 and NVDIMM_FAMILY_MSFT
respectively.
See the specifications for these command families here:
http://pmem.io/documents/NVDIMM_DSM_Interface-V1.6.pdf
https://github.com/HewlettPackard/hpe-nvm/blob/master/Documentation/
https://msdn.microsoft.com/library/windows/hardware/mt604741"
What: /sys/bus/nd/devices/nmemX/nfit/id
Date: Apr, 2016
KernelVersion: v4.7
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.
What: /sys/bus/nd/devices/nmemX/nfit/subsystem_vendor
Date: Apr, 2016
KernelVersion: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Sub-system vendor id of the NVDIMM non-volatile memory
subsystem controller.
What: /sys/bus/nd/devices/nmemX/nfit/subsystem_rev_id
Date: Apr, 2016
KernelVersion: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Sub-system revision id 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: v4.7
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Sub-system device id 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: Jun, 2015
KernelVersion: v4.2
Contact: linux-nvdimm@lists.01.org
Description:
(RO) ACPI NFIT table revision number.
What: /sys/bus/nd/devices/ndbusX/nfit/scrub
Date: Sep, 2016
KernelVersion: v4.9
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: v4.9
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: v4.13
Contact: linux-nvdimm@lists.01.org
Description:
(RO) The bitmask indicates the supported bus specific control
functions. See the section named 'NVDIMM Root Device _DSMs' in
the ACPI specification.
What: /sys/bus/nd/devices/regionX/nfit/range_index
Date: Jun, 2015
KernelVersion: v4.2
Contact: linux-nvdimm@lists.01.org
Description:
(RO) A unique number provided by the BIOS to identify an address
range. Used by NVDIMM Region Mapping Structure to uniquely refer
to this structure. Value of 0 is reserved and not used as an
index.
What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size
Date: Aug, 2017
KernelVersion: v4.14
Contact: linux-nvdimm@lists.01.org
Description:
(RO) Size of a write request to a DIMM that will not incur a
read-modify-write cycle at the memory controller.
When the nfit driver initializes it runs an ARS (Address Range
Scrub) operation across every pmem range. Part of that process
involves determining the ARS capabilities of a given address
range. One of the capabilities that is reported is the 'Clear
Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2
section 9.20.7.4 Function Index 1 - Query ARS Capabilities).
This property indicates the boundary at which the NVDIMM may
need to perform read-modify-write cycles to maintain ECC (Error
Correcting Code) blocks.

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What: /sys/bus/rapidio/devices/nn:d:iiii
Description:
For each RapidIO device, the RapidIO subsystem creates files in
an individual subdirectory with the following name format of
device_name "nn:d:iiii", where:
nn - two-digit hexadecimal ID of RapidIO network where the
device resides
d - device type: 'e' - for endpoint or 's' - for switch
iiii - four-digit device destID for endpoints, or switchID for
switches
For example, below is a list of device directories that
represents a typical RapidIO network with one switch, one host,
and two agent endpoints, as it is seen by the enumerating host
(with destID = 1):
/sys/bus/rapidio/devices/00:e:0000
/sys/bus/rapidio/devices/00:e:0002
/sys/bus/rapidio/devices/00:s:0001
NOTE: An enumerating or discovering endpoint does not create a
sysfs entry for itself, this is why an endpoint with destID=1 is
not shown in the list.
Attributes Common for All RapidIO Devices
-----------------------------------------
What: /sys/bus/rapidio/devices/nn:d:iiii/did
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns the device identifier
What: /sys/bus/rapidio/devices/nn:d:iiii/vid
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns the device vendor identifier
What: /sys/bus/rapidio/devices/nn:d:iiii/device_rev
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns the device revision level
What: /sys/bus/rapidio/devices/nn:d:iiii/asm_did
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns identifier for the assembly containing the device
What: /sys/bus/rapidio/devices/nn:d:iiii/asm_rev
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns revision level of the assembly containing the
device
What: /sys/bus/rapidio/devices/nn:d:iiii/asm_vid
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns vendor identifier of the assembly containing the
device
What: /sys/bus/rapidio/devices/nn:d:iiii/destid
Date: Mar, 2011
KernelVersion: v2.6.3
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns device destination ID assigned by the enumeration
routine
What: /sys/bus/rapidio/devices/nn:d:iiii/lprev
Date: Mar, 2011
KernelVersion: v2.6.39
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns name of previous device (switch) on the path to the
device that that owns this attribute
What: /sys/bus/rapidio/devices/nn:d:iiii/modalias
Date: Jul, 2013
KernelVersion: v3.11
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns the device modalias
What: /sys/bus/rapidio/devices/nn:d:iiii/config
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RW) Binary attribute to read from and write to the device
configuration registers using the RapidIO maintenance
transactions. This attribute is similar in behaviour to the
"config" attribute of PCI devices and provides an access to the
RapidIO device registers using standard file read and write
operations.
RapidIO Switch Device Attributes
--------------------------------
RapidIO switches have additional attributes in sysfs. RapidIO subsystem supports
common and device-specific sysfs attributes for switches. Because switches are
integrated into the RapidIO subsystem, it offers a method to create
device-specific sysfs attributes by specifying a callback function that may be
set by the switch initialization routine during enumeration or discovery
process.
What: /sys/bus/rapidio/devices/nn:s:iiii/routes
Date: Nov, 2005
KernelVersion: v2.6.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) reports switch routing information in "destID port" format.
This attribute reports only valid routing table entries, one
line for each entry.
What: /sys/bus/rapidio/devices/nn:s:iiii/destid
Date: Mar, 2011
KernelVersion: v2.6.3
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) device destination ID of the associated device that defines
a route to the switch
What: /sys/bus/rapidio/devices/nn:s:iiii/hopcount
Date: Mar, 2011
KernelVersion: v2.6.39
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) number of hops on the path to the switch
What: /sys/bus/rapidio/devices/nn:s:iiii/lnext
Date: Mar, 2011
KernelVersion: v2.6.39
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) returns names of devices linked to the switch except one of
a device linked to the ingress port (reported as "lprev"). This
is an array names with number of lines equal to number of ports
in switch. If a switch port has no attached device, returns
"null" instead of a device name.
Device-specific Switch Attributes
---------------------------------
IDT_GEN2-
What: /sys/bus/rapidio/devices/nn:s:iiii/errlog
Date: Oct, 2010
KernelVersion: v2.6.37
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) reads contents of device error log until it is empty.
RapidIO Bus Attributes
----------------------
What: /sys/bus/rapidio/scan
Date: May, 2013
KernelVersion: v3.11
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(WO) Allows to trigger enumeration discovery process from user
space. To initiate an enumeration or discovery process on
specific mport device, a user needs to write mport_ID (not
RapidIO destination ID) into this file. The mport_ID is a
sequential number (0 ... RIO_MAX_MPORTS) assigned to the mport
device. For example, for a machine with a single RapidIO
controller, mport_ID for that controller always will be 0. To
initiate RapidIO enumeration/discovery on all available mports a
user must write '-1' (or RIO_MPORT_ANY) into this attribute
file.

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What: /sys/bus/rbd/
Date: November 2010
Contact: Yehuda Sadeh <yehuda@newdream.net>,
Sage Weil <sage@newdream.net>
What: /sys/bus/rbd/add
Date: Oct, 2010
KernelVersion: v2.6.37
Contact: Sage Weil <sage@newdream.net>
Description:
(WO) Add rbd block device.
Being used for adding and removing rbd block devices.
Usage: <mon ip addr> <options> <pool name> <rbd image name> [<snap name>]
Usage: <mon ip addr> <options> <pool name> <rbd image name> [<snap name>]
$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
The snapshot name can be "-" or omitted to map the image
read/write. A <dev-id> will be assigned for any registered block
device. If snapshot is used, it will be mapped read-only.
The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
will be assigned for any registered block device. If snapshot is used, it will
be mapped read-only.
Usage: <dev-id> [force]
What: /sys/bus/rbd/remove
Date: Oct, 2010
KernelVersion: v2.6.37
Contact: Sage Weil <sage@newdream.net>
Description:
(WO) Remove rbd block device.
$ echo 2 > /sys/bus/rbd/remove
Usage: <dev-id> [force]
$ echo 2 > /sys/bus/rbd/remove
Optional "force" argument which when passed will wait for
running requests and then unmap the image. Requests sent to the
driver after initiating the removal will be failed. (August
2016, since 4.9.)
Optional "force" argument which when passed will wait for running requests and
then unmap the image. Requests sent to the driver after initiating the removal
will be failed. (August 2016, since 4.9.)
What: /sys/bus/rbd/add_single_major
Date: December 2013
KernelVersion: 3.14
Contact: Sage Weil <sage@inktank.com>
Description: Available only if rbd module is inserted with single_major
Date: Dec, 2013
KernelVersion: v3.14
Contact: Sage Weil <sage@newdream.net>
Description:
(WO) Available only if rbd module is inserted with single_major
parameter set to true.
Usage is the same as for /sys/bus/rbd/add. If present,
Usage is the same as for /sys/bus/rbd/add. If present, this
should be used instead of the latter: any attempts to use
/sys/bus/rbd/add if /sys/bus/rbd/add_single_major is
available will fail for backwards compatibility reasons.
/sys/bus/rbd/add if /sys/bus/rbd/add_single_major is available
will fail for backwards compatibility reasons.
What: /sys/bus/rbd/remove_single_major
Date: December 2013
KernelVersion: 3.14
Contact: Sage Weil <sage@inktank.com>
Description: Available only if rbd module is inserted with single_major
Date: Dec, 2013
KernelVersion: v3.14
Contact: Sage Weil <sage@newdream.net>
Description:
(WO) Available only if rbd module is inserted with single_major
parameter set to true.
Usage is the same as for /sys/bus/rbd/remove. If present,
Usage is the same as for /sys/bus/rbd/remove. If present, this
should be used instead of the latter: any attempts to use
/sys/bus/rbd/remove if /sys/bus/rbd/remove_single_major is
available will fail for backwards compatibility reasons.
Entries under /sys/bus/rbd/devices/<dev-id>/
--------------------------------------------
client_addr
What: /sys/bus/rbd/supported_features
Date: Mar, 2017
KernelVersion: v4.11
Contact: Sage Weil <sage@newdream.net>
Description:
(RO) Displays the features supported by the rbd module so that
userspace can generate meaningful error messages and spell out
unsupported features that need to be disabled.
The ceph unique client entity_addr_t (address + nonce).
The format is <address>:<port>/<nonce>: '1.2.3.4:1234/5678' or
'[1:2:3:4:5:6:7:8]:1234/5678'. (August 2016, since 4.9.)
client_id
What: /sys/bus/rbd/devices/<dev-id>/size
What: /sys/bus/rbd/devices/<dev-id>/major
What: /sys/bus/rbd/devices/<dev-id>/client_id
What: /sys/bus/rbd/devices/<dev-id>/pool
What: /sys/bus/rbd/devices/<dev-id>/name
What: /sys/bus/rbd/devices/<dev-id>/refresh
What: /sys/bus/rbd/devices/<dev-id>/current_snap
Date: Oct, 2010
KernelVersion: v2.6.37
Contact: Sage Weil <sage@newdream.net>
Description:
size: (RO) The size (in bytes) of the mapped block
device.
The ceph unique client id that was assigned for this specific session.
major: (RO) The block device major number.
cluster_fsid
client_id: (RO) The ceph unique client id that was assigned
for this specific session.
The ceph cluster UUID. (August 2016, since 4.9.)
pool: (RO) The name of the storage pool where this rbd
image resides. An rbd image name is unique
within its pool.
config_info
name: (RO) The name of the rbd image.
The string written into /sys/bus/rbd/add{,_single_major}. (August
2016, since 4.9.)
refresh: (WO) Writing to this file will reread the image
header data and set all relevant data structures
accordingly.
features
current_snap: (RO) The current snapshot for which the device
is mapped.
A hexadecimal encoding of the feature bits for this image.
major
What: /sys/bus/rbd/devices/<dev-id>/pool_id
Date: Jul, 2012
KernelVersion: v3.6
Contact: Sage Weil <sage@newdream.net>
Description:
(RO) The unique identifier for the rbd image's pool. This is a
permanent attribute of the pool. A pool's id will never change.
The block device major number.
minor
What: /sys/bus/rbd/devices/<dev-id>/image_id
What: /sys/bus/rbd/devices/<dev-id>/features
Date: Oct, 2012
KernelVersion: v3.7
Contact: Sage Weil <sage@newdream.net>
Description:
image_id: (RO) The unique id for the rbd image. (For rbd
image format 1 this is empty.)
The block device minor number. (December 2013, since 3.14.)
features: (RO) A hexadecimal encoding of the feature bits
for this image.
name
The name of the rbd image.
What: /sys/bus/rbd/devices/<dev-id>/parent
Date: Nov, 2012
KernelVersion: v3.8
Contact: Sage Weil <sage@newdream.net>
Description:
(RO) Information identifying the chain of parent images in a
layered rbd image. Entries are separated by empty lines.
image_id
The unique id for the rbd image. (For rbd image format 1
this is empty.)
What: /sys/bus/rbd/devices/<dev-id>/minor
Date: Dec, 2013
KernelVersion: v3.14
Contact: Sage Weil <sage@newdream.net>
Description:
(RO) The block device minor number.
pool
The name of the storage pool where this rbd image resides.
An rbd image name is unique within its pool.
What: /sys/bus/rbd/devices/<dev-id>/snap_id
What: /sys/bus/rbd/devices/<dev-id>/config_info
What: /sys/bus/rbd/devices/<dev-id>/cluster_fsid
What: /sys/bus/rbd/devices/<dev-id>/client_addr
Date: Aug, 2016
KernelVersion: v4.9
Contact: Sage Weil <sage@newdream.net>
Description:
snap_id: (RO) The current snapshot's id.
pool_id
config_info: (RO) The string written into
/sys/bus/rbd/add{,_single_major}.
The unique identifier for the rbd image's pool. This is
a permanent attribute of the pool. A pool's id will never
change.
cluster_fsid: (RO) The ceph cluster UUID.
size
The size (in bytes) of the mapped block device.
refresh
Writing to this file will reread the image header data and set
all relevant datastructures accordingly.
current_snap
The current snapshot for which the device is mapped.
snap_id
The current snapshot's id. (August 2016, since 4.9.)
parent
Information identifying the chain of parent images in a layered rbd
image. Entries are separated by empty lines.
client_addr: (RO) The ceph unique client
entity_addr_t (address + nonce). The format is
<address>:<port>/<nonce>: '1.2.3.4:1234/5678' or
'[1:2:3:4:5:6:7:8]:1234/5678'.

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sysfs interface for analog devices adp5520(01) backlight driver
---------------------------------------------------------------
The backlight brightness control operates at three different levels for the
adp5520 and adp5501 devices: daylight (level 1), office (level 2) and dark
(level 3). By default the brightness operates at the daylight brightness level.
What: /sys/class/backlight/<backlight>/daylight_max
What: /sys/class/backlight/<backlight>/office_max
What: /sys/class/backlight/<backlight>/dark_max
Date: Sep, 2009
KernelVersion: v2.6.32
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RW) Maximum current setting for the backlight when brightness
is at one of the three levels (daylight, office or dark). This
is an input code between 0 and 127, which is transformed to a
value between 0 mA and 30 mA using linear or non-linear
algorithms.
What: /sys/class/backlight/<backlight>/daylight_dim
What: /sys/class/backlight/<backlight>/office_dim
What: /sys/class/backlight/<backlight>/dark_dim
Date: Sep, 2009
KernelVersion: v2.6.32
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RW) Dim current setting for the backlight when brightness is at
one of the three levels (daylight, office or dark). This is an
input code between 0 and 127, which is transformed to a value
between 0 mA and 30 mA using linear or non-linear algorithms.

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sysfs interface for analog devices adp8860 backlight driver
-----------------------------------------------------------
The backlight brightness control operates at three different levels for the
adp8860, adp8861 and adp8863 devices: daylight (level 1), office (level 2) and
dark (level 3). By default the brightness operates at the daylight brightness
level.
What: /sys/class/backlight/<backlight>/ambient_light_level
Date: Apr, 2010
KernelVersion: v2.6.35
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RO) 13-bit conversion value for the first light sensor—high
byte (Bit 12 to Bit 8). The value is updated every 80 ms (when
the light sensor is enabled).
What: /sys/class/backlight/<backlight>/ambient_light_zone
Date: Apr, 2010
KernelVersion: v2.6.35
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RW) Read or write the specific level at which the backlight
operates. Value "0" enables automatic ambient light sensing, and
values "1", "2" or "3" set the control to daylight, office or
dark respectively.
What: /sys/class/backlight/<backlight>/l1_daylight_max
What: /sys/class/backlight/<backlight>/l2_office_max
What: /sys/class/backlight/<backlight>/l3_dark_max
Date: Apr, 2010
KernelVersion: v2.6.35
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RW) Maximum current setting for the backlight when brightness
is at one of the three levels (daylight, office or dark). This
is an input code between 0 and 127, which is transformed to a
value between 0 mA and 30 mA using linear or non-linear
algorithms.
What: /sys/class/backlight/<backlight>/l1_daylight_dim
What: /sys/class/backlight/<backlight>/l2_office_dim
What: /sys/class/backlight/<backlight>/l3_dark_dim
Date: Apr, 2010
KernelVersion: v2.6.35
Contact: Michael Hennerich <michael.hennerich@analog.com>
Description:
(RW) Dim current setting for the backlight when brightness is at
one of the three levels (daylight, office or dark). This is an
input code between 0 and 127, which is transformed to a value
between 0 mA and 30 mA using linear or non-linear algorithms.

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sysfs interface for Texas Instruments lm3639 backlight + flash led driver chip
------------------------------------------------------------------------------
What: /sys/class/backlight/<backlight>/bled_mode
Date: Oct, 2012
KernelVersion: v3.10
Contact: dri-devel@lists.freedesktop.org
Description:
(WO) Write to the backlight mapping mode. The backlight current
can be mapped for either exponential (value "0") or linear
mapping modes (default).

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What: /sys/class/bsr/bsr*/bsr_size
Date: Jul, 2008
KernelVersion: 2.6.27
Contact: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Description:
(RO) Size of the barrier-synchronization register (BSR)
register in bytes.
What: /sys/class/bsr/bsr*/bsr_length
Date: Jul, 2008
KernelVersion: 2.6.27
Contact: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Description:
(RO) The length of memory region that can be mapped in bytes.
What: /sys/class/bsr/bsr*/bsr_stride
Date: Jul, 2008
KernelVersion: 2.6.27
Contact: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Description:
(RO) The stride or the interval at which the allocated BSR bytes
repeat within the mapping.

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What: /sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/ndevs/<gid-index>
Date: November 29, 2015
KernelVersion: 4.4.0
Contact: linux-rdma@vger.kernel.org
Description: The net-device's name associated with the GID resides
at index <gid-index>.
What: /sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/types/<gid-index>
Date: November 29, 2015
KernelVersion: 4.4.0
Contact: linux-rdma@vger.kernel.org
Description: The RoCE type of the associated GID resides at index <gid-index>.
This could either be "IB/RoCE v1" for IB and RoCE v1 based GODs
or "RoCE v2" for RoCE v2 based GIDs.

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sysfs interface for the S6E63M0 AMOLED LCD panel driver
-------------------------------------------------------
What: /sys/class/lcd/<lcd>/gamma_mode
Date: May, 2010
KernelVersion: v2.6.35
Contact: dri-devel@lists.freedesktop.org
Description:
(RW) Read or write the gamma mode. Following three modes are
supported:
0 - gamma value 2.2,
1 - gamma value 1.9 and
2 - gamma value 1.7.
What: /sys/class/lcd/<lcd>/gamma_table
Date: May, 2010
KernelVersion: v2.6.35
Contact: dri-devel@lists.freedesktop.org
Description:
(RO) Displays the size of the gamma table i.e. the number of
gamma modes available.
This is a backlight lcd driver. These interfaces are an extension to the API
documented in Documentation/ABI/testing/sysfs-class-lcd and in
Documentation/ABI/stable/sysfs-class-backlight (under
/sys/class/backlight/<backlight>/).

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What: /sys/class/pktcdvd/
Date: Oct. 2006
KernelVersion: 2.6.20
Contact: Thomas Maier <balagi@justmail.de>
Description:
sysfs interface
---------------
The pktcdvd module (packet writing driver) creates the following files in the
sysfs: (<devid> is in the format major:minor)
The pktcdvd module (packet writing driver) creates
these files in the sysfs:
(<devid> is in format major:minor )
What: /sys/class/pktcdvd/add
What: /sys/class/pktcdvd/remove
What: /sys/class/pktcdvd/device_map
Date: Oct. 2006
KernelVersion: 2.6.20
Contact: Thomas Maier <balagi@justmail.de>
Description:
/sys/class/pktcdvd/
add (0200) Write a block device id (major:minor)
to create a new pktcdvd device and map
it to the block device.
add: (WO) Write a block device id (major:minor) to
create a new pktcdvd device and map it to the
block device.
remove (0200) Write the pktcdvd device id (major:minor)
to it to remove the pktcdvd device.
remove: (WO) Write the pktcdvd device id (major:minor)
to remove the pktcdvd device.
device_map (0444) Shows the device mapping in format:
pktcdvd[0-7] <pktdevid> <blkdevid>
device_map: (RO) Shows the device mapping in format:
pktcdvd[0-7] <pktdevid> <blkdevid>
/sys/class/pktcdvd/pktcdvd[0-7]/
dev (0444) Device id
uevent (0200) To send an uevent.
/sys/class/pktcdvd/pktcdvd[0-7]/stat/
packets_started (0444) Number of started packets.
packets_finished (0444) Number of finished packets.
What: /sys/class/pktcdvd/pktcdvd[0-7]/dev
What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent
Date: Oct. 2006
KernelVersion: 2.6.20
Contact: Thomas Maier <balagi@justmail.de>
Description:
dev: (RO) Device id
kb_written (0444) kBytes written.
kb_read (0444) kBytes read.
kb_read_gather (0444) kBytes read to fill write packets.
uevent: (WO) To send a uevent
reset (0200) Write any value to it to reset
pktcdvd device statistic values, like
bytes read/written.
/sys/class/pktcdvd/pktcdvd[0-7]/write_queue/
size (0444) Contains the size of the bio write
queue.
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
Date: Oct. 2006
KernelVersion: 2.6.20
Contact: Thomas Maier <balagi@justmail.de>
Description:
packets_started: (RO) Number of started packets.
congestion_off (0644) If bio write queue size is below
this mark, accept new bio requests
from the block layer.
packets_finished: (RO) Number of finished packets.
congestion_on (0644) If bio write queue size is higher
as this mark, do no longer accept
bio write requests from the block
layer and wait till the pktcdvd
device has processed enough bio's
so that bio write queue size is
below congestion off mark.
A value of <= 0 disables congestion
control.
kb_written: (RO) kBytes written.
kb_read: (RO) kBytes read.
kb_read_gather: (RO) kBytes read to fill write packets.
reset: (WO) Write any value to it to reset
pktcdvd device statistic values, like
bytes read/written.
What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
Date: Oct. 2006
KernelVersion: 2.6.20
Contact: Thomas Maier <balagi@justmail.de>
Description:
size: (RO) Contains the size of the bio write queue.
congestion_off: (RW) If bio write queue size is below this mark,
accept new bio requests from the block layer.
congestion_on: (RW) If bio write queue size is higher as this
mark, do no longer accept bio write requests
from the block layer and wait till the pktcdvd
device has processed enough bio's so that bio
write queue size is below congestion off mark.
A value of <= 0 disables congestion control.
Example:

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What: /sys/class/rapidio_port
Description:
On-chip RapidIO controllers and PCIe-to-RapidIO bridges
(referenced as "Master Port" or "mport") are presented in sysfs
as the special class of devices: "rapidio_port".
The /sys/class/rapidio_port subdirectory contains individual
subdirectories named as "rapidioN" where N = mport ID registered
with RapidIO subsystem.
NOTE: An mport ID is not a RapidIO destination ID assigned to a
given local mport device.
What: /sys/class/rapidio_port/rapidioN/sys_size
Date: Apr, 2014
KernelVersion: v3.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) reports RapidIO common transport system size:
0 = small (8-bit destination ID, max. 256 devices),
1 = large (16-bit destination ID, max. 65536 devices).
What: /sys/class/rapidio_port/rapidioN/port_destid
Date: Apr, 2014
KernelVersion: v3.15
Contact: Matt Porter <mporter@kernel.crashing.org>,
Alexandre Bounine <alexandre.bounine@idt.com>
Description:
(RO) reports RapidIO destination ID assigned to the given
RapidIO mport device. If value 0xFFFFFFFF is returned this means
that no valid destination ID have been assigned to the mport
(yet). Normally, before enumeration/discovery have been executed
only fabric enumerating mports have a valid destination ID
assigned to them using "hdid=..." rapidio module parameter.
After enumeration or discovery was performed for a given mport device,
the corresponding subdirectory will also contain subdirectories for each
child RapidIO device connected to the mport.
The example below shows mport device subdirectory with several child RapidIO
devices attached to it.
[rio@rapidio ~]$ ls /sys/class/rapidio_port/rapidio0/ -l
total 0
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0001
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0004
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0007
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0002
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0003
drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0005
lrwxrwxrwx 1 root root 0 Feb 11 15:11 device -> ../../../0000:01:00.0
-r--r--r-- 1 root root 4096 Feb 11 15:11 port_destid
drwxr-xr-x 2 root root 0 Feb 11 15:11 power
lrwxrwxrwx 1 root root 0 Feb 11 15:04 subsystem -> ../../../../../../class/rapidio_port
-r--r--r-- 1 root root 4096 Feb 11 15:11 sys_size
-rw-r--r-- 1 root root 4096 Feb 11 15:04 uevent

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What: /sys/devices/platform/i8042/.../sensitivity
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Trackpoint sensitivity.
What: /sys/devices/platform/i8042/.../intertia
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Negative inertia factor. High values cause the cursor to
snap backward when the trackpoint is released.
What: /sys/devices/platform/i8042/.../reach
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Backup range for z-axis press.
What: /sys/devices/platform/i8042/.../draghys
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) The drag hysteresis controls how hard it is to drag with
z-axis pressed.
What: /sys/devices/platform/i8042/.../mindrag
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Minimum amount of force needed to trigger dragging.
What: /sys/devices/platform/i8042/.../speed
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Speed of the trackpoint cursor.
What: /sys/devices/platform/i8042/.../thresh
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Minimum value for z-axis force required to trigger a press
or release, relative to the running average.
What: /sys/devices/platform/i8042/.../upthresh
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) The offset from the running average required to generate a
select (click) on z-axis on release.
What: /sys/devices/platform/i8042/.../ztime
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) This attribute determines how sharp a press has to be in
order to be recognized.
What: /sys/devices/platform/i8042/.../jenks
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Minimum curvature in degrees required to generate a double
click without a release.
What: /sys/devices/platform/i8042/.../skipback
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) When the skipback bit is set, backup cursor movement during
releases from drags will be suppressed. The default value for
this bit is 0.
What: /sys/devices/platform/i8042/.../ext_dev
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Disable (0) or enable (1) external pointing device.
What: /sys/devices/platform/i8042/.../press_to_select
Date: Aug, 2005
KernelVersion: 2.6.14
Contact: linux-input@vger.kernel.org
Description:
(RW) Writing a value of 1 to this file will enable the Press to
Select functions like tapping the control stick to simulate a
left click, and writing 0 will disable it.
What: /sys/devices/platform/i8042/.../drift_time
Date: Dec, 2014
KernelVersion: 3.19
Contact: linux-input@vger.kernel.org
Description:
(RW) This parameter controls the period of time to test for a
‘hands off’ condition (i.e. when no force is applied) before a
drift (noise) calibration occurs.
IBM Trackpoints have a feature to compensate for drift by
recalibrating themselves periodically. By default, if for 0.5
seconds there is no change in position, it's used as the new
zero. This duration is too low. Often, the calibration happens
when the trackpoint is in fact being used.