ABI stable symbols — The Linux Kernel 6.14.4-gnu-4-vanilla documentation

# ABI stable symbols

Documents the interfaces that the developer has defined to be stable.

Userspace programs are free to use these interfaces with no restrictions, and backward compatibility for them will be guaranteed for at least 2 years.

Most interfaces (like syscalls) are expected to never change and always be available.

## Symbols under /dev/fw

/dev/fw[0-9]+

Defined on file firewire-cdev

The character device files /dev/fw* are the interface between firewire-core and IEEE 1394 device drivers implemented in userspace. The ioctl(2)- and read(2)-based ABI is defined and documented in <linux/firewire-cdev.h>.

This ABI offers most of the features which firewire-core also exposes to kernelspace IEEE 1394 drivers.

Each /dev/fw* is associated with one IEEE 1394 node, which can be remote or local nodes. Operations on a /dev/fw* file have different scope:

> - The 1394 node which is associated with the file:

>   > - Asynchronous request transmission

>   > - Get the Configuration ROM

>   > - Query node ID

>   > - Query maximum speed of the path between this node and local node

> - The 1394 bus (i.e. “card”) to which the node is attached to:

>   > - Isochronous stream transmission and reception

>   > - Asynchronous stream transmission and reception

>   > - Asynchronous broadcast request transmission

>   > - PHY packet transmission and reception

>   > - Allocate, reallocate, deallocate isochronous resources (channels, bandwidth) at the bus’s IRM

>   > - Query node IDs of local node, root node, IRM, bus manager

>   > - Query cycle time

>   > - Bus reset initiation, bus reset event reception

> - All 1394 buses:

>   > - Allocation of IEEE 1212 address ranges on the local link layers, reception of inbound requests to such an address range, asynchronous response transmission to inbound requests

>   > - Addition of descriptors or directories to the local nodes’ Configuration ROM

Due to the different scope of operations and in order to let userland implement different access permission models, some operations are restricted to /dev/fw* files that are associated with a local node:

> - Addition of descriptors or directories to the local nodes’ Configuration ROM

> - PHY packet transmission and reception

A /dev/fw* file remains associated with one particular node during its entire life time. Bus topology changes, and hence node ID changes, are tracked by firewire-core. ABI users do not need to be aware of topology.

The following file operations are supported:

open(2)

  Currently the only useful flags are O_RDWR.

ioctl(2)

  Initiate various actions. Some take immediate effect, others are performed asynchronously while or after the ioctl returns. See the inline documentation in <linux/firewire-cdev.h> for descriptions of all ioctls.

poll(2), select(2), epoll_wait(2) etc.

  Watch for events to become available to be read.

read(2)

  Receive various events. There are solicited events like outbound asynchronous transaction completion or isochronous buffer completion, and unsolicited events such as bus resets, request reception, or PHY packet reception. Always use a read buffer which is large enough to receive the largest event that could ever arrive. See <linux/firewire-cdev.h> for descriptions of all event types and for which ioctls affect reception of events.

mmap(2)

  Allocate a DMA buffer for isochronous reception or transmission and map it into the process address space. The arguments should be used as follows: addr = NULL, length = the desired buffer size, i.e. number of packets times size of largest packet, prot = at least PROT_READ for reception and at least PROT_WRITE for transmission, flags = MAP_SHARED, fd = the handle to the /dev/fw*, offset = 0.

Isochronous reception works in packet-per-buffer fashion except for multichannel reception which works in buffer-fill mode.

munmap(2)

  Unmap the isochronous I/O buffer from the process address space.

close(2)

  Besides stopping and freeing I/O contexts that were associated with the file descriptor, back out any changes to the local nodes’ Configuration ROM. Deallocate isochronous channels and bandwidth at the IRM that were marked for kernel-assisted re- and deallocation.

Users: libraw1394; libdc1394; libhinawa; tools like linux-firewire-utils, fwhack, ...

## Symbols under /sys/accessibility

/sys/accessibility/speakup/<synth-name>/

Defined on file sysfs-driver-speakup

In /sys/accessibility/speakup is a directory corresponding to the synthesizer driver currently in use (E.G) soft for the soft driver. This directory contains files which control the speech synthesizer itself, as opposed to controlling the speakup screen reader. The parameters in this directory have the same names and functions across all supported synthesizers. The range of values for freq, pitch, rate, and vol is the same for all supported synthesizers, with the given range being internally mapped by the driver to more or less fit the range of values supported for a given parameter by the individual synthesizer. Below is a description of values and parameters for soft synthesizer, which is currently the most commonly used.

/sys/accessibility/speakup/<synth-name>/caps_start

Defined on file sysfs-driver-speakup

This is the string that is sent to the synthesizer to cause it to start speaking uppercase letters. For the soft synthesizer and most others, this causes the pitch of the voice to rise above the currently set pitch.

/sys/accessibility/speakup/<synth-name>/caps_stop

Defined on file sysfs-driver-speakup

This is the string sent to the synthesizer to cause it to stop speaking uppercase letters. In the case of the soft synthesizer and most others, this returns the pitch of the voice down to the currently set pitch.

/sys/accessibility/speakup/<synth-name>/delay_time

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/<synth-name>/direct

Defined on file sysfs-driver-speakup

Controls if punctuation is spoken by speakup, or by the synthesizer.

For example, speakup speaks “>” as “greater”, while the espeak synthesizer used by the soft driver speaks “greater than”. Zero lets speakup speak the punctuation. One lets the synthesizer itself speak punctuation.

/sys/accessibility/speakup/<synth-name>/flush_time

Defined on file sysfs-driver-speakup

Gets or sets the timeout to wait for the synthesizer flush to complete. This can be used when the cable gets faulty and flush notifications are getting lost.

/sys/accessibility/speakup/<synth-name>/freq

Defined on file sysfs-driver-speakup

Gets or sets the frequency of the speech synthesizer. Range is 0-9.

/sys/accessibility/speakup/<synth-name>/full_time

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/<synth-name>/inflection

Defined on file sysfs-driver-speakup

Gets or sets the inflection of the synthesizer, i.e. the pitch range. The range is 0-9.

/sys/accessibility/speakup/<synth-name>/jiffy_delta

Defined on file sysfs-driver-speakup

This controls how many jiffys the kernel gives to the synthesizer. Setting this too high can make a system unstable, or even crash it.

/sys/accessibility/speakup/<synth-name>/pitch

Defined on file sysfs-driver-speakup

Gets or sets the pitch of the synthesizer. The range is 0-9.

/sys/accessibility/speakup/<synth-name>/punct

Defined on file sysfs-driver-speakup

Gets or sets the amount of punctuation spoken by the synthesizer. The range for the soft driver seems to be 0-2. TODO: How is this related to speakup’s punc_level, or reading_punc.

/sys/accessibility/speakup/<synth-name>/rate

Defined on file sysfs-driver-speakup

Gets or sets the rate of the synthesizer. Range is from zero slowest, to nine fastest.

/sys/accessibility/speakup/<synth-name>/tone

Defined on file sysfs-driver-speakup

Gets or sets the tone of the speech synthesizer. The range for the soft driver seems to be 0-2. This seems to make no difference if using espeak and the espeakup connector. TODO: does espeakup support different tonalities?

/sys/accessibility/speakup/<synth-name>/trigger_time

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/<synth-name>/voice

Defined on file sysfs-driver-speakup

Gets or sets the voice used by the synthesizer if the synthesizer can speak in more than one voice. The range for the soft driver is 0-7. Note that while espeak supports multiple voices, this parameter will not set the voice when the espeakup connector is used between speakup and espeak.

/sys/accessibility/speakup/<synth-name>/vol

Defined on file sysfs-driver-speakup

Gets or sets the volume of the speech synthesizer. Range is 0-9, with zero being the softest, and nine being the loudest.

/sys/accessibility/speakup/attrib_bleep

Defined on file sysfs-driver-speakup

Beeps the PC speaker when there is an attribute change such as foreground or background color when using speakup review commands. One = on, zero = off.

/sys/accessibility/speakup/bell_pos

Defined on file sysfs-driver-speakup

This works much like a typewriter bell. If for example 72 is echoed to bell_pos, it will beep the PC speaker when typing on a line past character 72.

/sys/accessibility/speakup/bleep_time

Defined on file sysfs-driver-speakup

This controls the duration of the PC speaker beeps speakup produces. TODO: What are the units? Jiffies?

/sys/accessibility/speakup/bleeps

Defined on file sysfs-driver-speakup

This controls whether one hears beeps through the PC speaker when using speakup’s review commands. TODO: what values does it accept?

/sys/accessibility/speakup/cur_phonetic

Defined on file sysfs-driver-speakup

This allows speakup to speak letters phoneticaly when arrowing through a word letter by letter. This doesn’t affect the spelling when typing the characters. When cur_phonetic=1, speakup will speak characters phoneticaly when arrowing over a letter. When cur_phonetic=0, speakup will speak letters as normally.

/sys/accessibility/speakup/cursor_time

Defined on file sysfs-driver-speakup

This controls cursor delay when using arrow keys. When a connection is very slow, with the default setting, when moving with the arrows, or backspacing etc. speakup says the incorrect characters. Set this to a higher value to adjust for the delay and better synchronisation between cursor position and speech.

/sys/accessibility/speakup/delimiters

Defined on file sysfs-driver-speakup

Delimit a word from speakup. TODO: add more info

/sys/accessibility/speakup/ex_num

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/i18n/announcements

Defined on file sysfs-driver-speakup

This file contains various general announcements, most of which cannot be categorized. You will find messages such as “You killed Speakup”, “I’m alive”, “leaving help”, “parked”, “unparked”, and others. You will also find the names of the screen edges and cursor tracking modes here.

/sys/accessibility/speakup/i18n/characters

Defined on file sysfs-driver-speakup

Through this sys entry, Speakup gives you the ability to change how Speakup pronounces a given character. You could, for example, change how some punctuation characters are spoken. You can even change how Speakup will pronounce certain letters. For further details see ‘12. Changing the Pronunciation of Characters’ in Speakup User’s Guide (file spkguide.txt in source).

/sys/accessibility/speakup/i18n/chartab

Defined on file sysfs-driver-speakup

TODO

/sys/accessibility/speakup/i18n/colors

Defined on file sysfs-driver-speakup

When you use the “say attributes” function, Speakup says the name of the foreground and background colors. These names come from the i18n/colors file.

/sys/accessibility/speakup/i18n/ctl_keys

Defined on file sysfs-driver-speakup

Here, you will find names of control keys. These are used with Speakup’s say_control feature.

/sys/accessibility/speakup/i18n/formatted

Defined on file sysfs-driver-speakup

This group of messages contains embedded formatting codes, to specify the type and width of displayed data. If you change these, you must preserve all of the formatting codes, and they must appear in the order used by the default messages.

/sys/accessibility/speakup/i18n/function_names

Defined on file sysfs-driver-speakup

Here, you will find a list of names for Speakup functions. These are used by the help system. For example, suppose that you have activated help mode, and you pressed keypad 3. Speakup says: “keypad 3 is character, say next.” The message “character, say next” names a Speakup function, and it comes from this function_names file.

/sys/accessibility/speakup/i18n/key_names

Defined on file sysfs-driver-speakup

Again, key_names is used by Speakup’s help system. In the previous example, Speakup said that you pressed “keypad 3.” This name came from the key_names file.

/sys/accessibility/speakup/i18n/states

Defined on file sysfs-driver-speakup

This file contains names for key states. Again, these are part of the help system. For instance, if you had pressed speakup + keypad 3, you would hear: “speakup keypad 3 is go to bottom edge.”

The speakup key is depressed, so the name of the key state is speakup.

This part of the message comes from the states collection.

/sys/accessibility/speakup/key_echo

Defined on file sysfs-driver-speakup

Controls if speakup speaks keys when they are typed. One = on, zero = off or don’t echo keys.

/sys/accessibility/speakup/keymap

Defined on file sysfs-driver-speakup

Speakup keymap remaps keys to Speakup functions. It uses a binary format. A special program called genmap is needed to compile a textual keymap into the binary format which is then loaded into /sys/accessibility/speakup/keymap.

/sys/accessibility/speakup/no_interrupt

Defined on file sysfs-driver-speakup

Controls if typing interrupts output from speakup. With no_interrupt set to zero, typing on the keyboard will interrupt speakup if for example the say screen command is used before the entire screen is read.

With no_interrupt set to one, if the say screen command is used, and one then types on the keyboard, speakup will continue to say the whole screen regardless until it finishes.

/sys/accessibility/speakup/punc_all

Defined on file sysfs-driver-speakup

This is a list of all the punctuation speakup should speak when punc_level is set to four.

/sys/accessibility/speakup/punc_level

Defined on file sysfs-driver-speakup

Controls the level of punctuation spoken as the screen is displayed, not reviewed. Levels range from zero no punctuation, to four, all punctuation. One corresponds to punc_some, two corresponds to punc_most, and three as well as four both correspond to punc_all. Some hardware synthesizers may have different levels each corresponding to three and four for punc_level. Also note that if punc_level is set to zero, and key_echo is set to one, typed punctuation is still spoken as it is typed.

/sys/accessibility/speakup/punc_most

Defined on file sysfs-driver-speakup

This is a list of all the punctuation speakup should speak when punc_level is set to two.

/sys/accessibility/speakup/punc_some

Defined on file sysfs-driver-speakup

This is a list of all the punctuation speakup should speak when punc_level is set to one.

/sys/accessibility/speakup/reading_punc

Defined on file sysfs-driver-speakup

Almost the same as punc_level, the differences being that reading_punc controls the level of punctuation when reviewing the screen with speakup’s screen review commands. The other difference is that reading_punc set to three speaks punc_all, and reading_punc set to four speaks all punctuation, including spaces.

/sys/accessibility/speakup/repeats

Defined on file sysfs-driver-speakup

A list of characters speakup repeats. Normally, when there are more than three characters in a row, speakup just reads three of those characters. For example, “......” would be read as dot, dot, dot. If a . is added to the list of characters in repeats, “......” would be read as dot, dot, dot, times six.

/sys/accessibility/speakup/say_control

Defined on file sysfs-driver-speakup

If set to one, speakup speaks shift, alt and control when those keys are pressed. If say_control is set to zero, shift, ctrl, and alt are not spoken when they are pressed.

/sys/accessibility/speakup/say_word_ctl

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/silent

Defined on file sysfs-driver-speakup

TODO:

/sys/accessibility/speakup/spell_delay

Defined on file sysfs-driver-speakup

This controls how fast a word is spelled when speakup’s say word review command is pressed twice quickly to speak the current word being reviewed. Zero just speaks the letters one after another, while values one through four seem to introduce more of a pause between the spelling of each letter by speakup.

/sys/accessibility/speakup/synth

Defined on file sysfs-driver-speakup

Gets or sets the synthesizer driver currently in use. Reading synth returns the synthesizer driver currently in use. Writing synth switches to the given synthesizer driver, provided it is either built into the kernel, or already loaded as a module.

/sys/accessibility/speakup/synth_direct

Defined on file sysfs-driver-speakup

Sends whatever is written to synth_direct directly to the speech synthesizer in use, bypassing speakup. This could be used to make the synthesizer speak a string, or to send control sequences to the synthesizer to change how the synthesizer behaves.

/sys/accessibility/speakup/version

Defined on file sysfs-driver-speakup

Reading version returns the version of speakup, and the version of the synthesizer driver currently in use.

## Symbols under /sys/block

/sys/block/<disk>/<partition>/alignment_offset

Defined on file sysfs-block

Storage devices may report a physical block size that is bigger than the logical block size (for instance a drive with 4KB physical sectors exposing 512-byte logical blocks to the operating system). This parameter indicates how many bytes the beginning of the partition is offset from the disk’s natural alignment.

/sys/block/<disk>/<partition>/discard_alignment

Defined on file sysfs-block

Devices that support discard functionality may internally allocate space in units that are bigger than the exported logical block size. The discard_alignment parameter indicates how many bytes the beginning of the partition is offset from the internal allocation unit’s natural alignment.

/sys/block/<disk>/<partition>/stat

Defined on file sysfs-block

The /sys/block/<disk>/<partition>/stat files display the I/O statistics of partition <partition>. The format is the same as the format of /sys/block/<disk>/stat.

/sys/block/<disk>/alignment_offset

Defined on file sysfs-block

Storage devices may report a physical block size that is bigger than the logical block size (for instance a drive with 4KB physical sectors exposing 512-byte logical blocks to the operating system). This parameter indicates how many bytes the beginning of the device is offset from the disk’s natural alignment.

/sys/block/<disk>/atomic_write_boundary_bytes

Defined on file sysfs-block

[RO] A device may need to internally split an atomic write I/O which straddles a given logical block address boundary. This parameter specifies the size in bytes of the atomic boundary if one is reported by the device. This value must be a power-of-two and at least the size as in atomic_write_unit_max_bytes. Any attempt to merge atomic write I/Os must not result in a merged I/O which crosses this boundary (if any).

/sys/block/<disk>/atomic_write_max_bytes

Defined on file sysfs-block

[RO] This parameter specifies the maximum atomic write size reported by the device. This parameter is relevant for merging of writes, where a merged atomic write operation must not exceed this number of bytes. This parameter may be greater than the value in atomic_write_unit_max_bytes as atomic_write_unit_max_bytes will be rounded down to a power-of-two and atomic_write_unit_max_bytes may also be limited by some other queue limits, such as max_segments. This parameter - along with atomic_write_unit_min_bytes and atomic_write_unit_max_bytes - will not be larger than max_hw_sectors_kb, but may be larger than max_sectors_kb.

/sys/block/<disk>/atomic_write_unit_max_bytes

Defined on file sysfs-block

[RO] This parameter defines the largest block which can be written atomically with an atomic write operation. This value must be a multiple of atomic_write_unit_min and must be a power-of-two. This value will not be larger than atomic_write_max_bytes.

/sys/block/<disk>/atomic_write_unit_min_bytes

Defined on file sysfs-block

[RO] This parameter specifies the smallest block which can be written atomically with an atomic write operation. All atomic write operations must begin at a atomic_write_unit_min boundary and must be multiples of atomic_write_unit_min. This value must be a power-of-two.

/sys/block/<disk>/discard_alignment

Defined on file sysfs-block

Devices that support discard functionality may internally allocate space in units that are bigger than the exported logical block size. The discard_alignment parameter indicates how many bytes the beginning of the device is offset from the internal allocation unit’s natural alignment.

/sys/block/<disk>/diskseq

Defined on file sysfs-block

The /sys/block/<disk>/diskseq files reports the disk sequence number, which is a monotonically increasing number assigned to every drive. Some devices, like the loop device, refresh such number every time the backing file is changed. The value type is 64 bit unsigned.

/sys/block/<disk>/hidden

Defined on file sysfs-block

[RO] the block device is hidden. it doesn’t produce events, and can’t be opened from userspace or using blkdev_get*. Used for the underlying components of multipath devices.

/sys/block/<disk>/inflight

Defined on file sysfs-block

Reports the number of I/O requests currently in progress (pending / in flight) in a device driver. This can be less than the number of requests queued in the block device queue. The report contains 2 fields: one for read requests and one for write requests. The value type is unsigned int. Cf. Block layer statistics in /sys/block/<dev>/stat which contains a single value for requests in flight. This is related to /sys/block/<disk>/queue/nr_requests and for SCSI device also its queue_depth.

/sys/block/<disk>/integrity/device_is_integrity_capable

Defined on file sysfs-block

Indicates whether a storage device is capable of storing integrity metadata. Set if the device is T10 PI-capable.

/sys/block/<disk>/integrity/format

Defined on file sysfs-block

Metadata format for integrity capable block device. E.g. T10-DIF-TYPE1-CRC.

/sys/block/<disk>/integrity/protection_interval_bytes

Defined on file sysfs-block

Describes the number of data bytes which are protected by one integrity tuple. Typically the device’s logical block size.

/sys/block/<disk>/integrity/read_verify

Defined on file sysfs-block

Indicates whether the block layer should verify the integrity of read requests serviced by devices that support sending integrity metadata.

/sys/block/<disk>/integrity/tag_size

Defined on file sysfs-block

Number of bytes of integrity tag space available per 512 bytes of data.

/sys/block/<disk>/integrity/write_generate

Defined on file sysfs-block

Indicates whether the block layer should automatically generate checksums for write requests bound for devices that support receiving integrity metadata.

/sys/block/<disk>/partscan

Defined on file sysfs-block

The /sys/block/<disk>/partscan files reports if partition scanning is enabled for the disk. It returns “1” if partition scanning is enabled, or “0” if not. The value type is a 32-bit unsigned integer, but only “0” and “1” are valid values.

/sys/block/<disk>/queue/add_random

Defined on file sysfs-block

[RW] This file allows to turn off the disk entropy contribution. Default value of this file is ‘1’(on).

/sys/block/<disk>/queue/chunk_sectors

Defined on file sysfs-block

[RO] chunk_sectors has different meaning depending on the type of the disk. For a RAID device (dm-raid), chunk_sectors indicates the size in 512B sectors of the RAID volume stripe segment. For a zoned block device, either host-aware or host-managed, chunk_sectors indicates the size in 512B sectors of the zones of the device, with the eventual exception of the last zone of the device which may be smaller.

/sys/block/<disk>/queue/crypto/

Defined on file sysfs-block

The presence of this subdirectory of /sys/block/<disk>/queue/ indicates that the device supports inline encryption. This subdirectory contains files which describe the inline encryption capabilities of the device. For more information about inline encryption, refer to Inline Encryption.

/sys/block/<disk>/queue/crypto/max_dun_bits

Defined on file sysfs-block

[RO] This file shows the maximum length, in bits, of data unit numbers accepted by the device in inline encryption requests.

/sys/block/<disk>/queue/crypto/modes/<mode>

Defined on file sysfs-block

[RO] For each crypto mode (i.e., encryption/decryption algorithm) the device supports with inline encryption, a file will exist at this location. It will contain a hexadecimal number that is a bitmask of the supported data unit sizes, in bytes, for that crypto mode.

Currently, the crypto modes that may be supported are:

> - AES-256-XTS

> - AES-128-CBC-ESSIV

> - Adiantum

For example, if a device supports AES-256-XTS inline encryption with data unit sizes of 512 and 4096 bytes, the file /sys/block/<disk>/queue/crypto/modes/AES-256-XTS will exist and will contain “0x1200”.

/sys/block/<disk>/queue/crypto/num_keyslots

Defined on file sysfs-block

[RO] This file shows the number of keyslots the device has for use with inline encryption.

/sys/block/<disk>/queue/dax

Defined on file sysfs-block

[RO] This file indicates whether the device supports Direct Access (DAX), used by CPU-addressable storage to bypass the pagecache. It shows ‘1’ if true, ‘0’ if not.

/sys/block/<disk>/queue/discard_granularity

Defined on file sysfs-block

[RO] Devices that support discard functionality may internally allocate space using units that are bigger than the logical block size. The discard_granularity parameter indicates the size of the internal allocation unit in bytes if reported by the device. Otherwise the discard_granularity will be set to match the device’s physical block size. A discard_granularity of 0 means that the device does not support discard functionality.

/sys/block/<disk>/queue/discard_max_bytes

Defined on file sysfs-block

[RW] While discard_max_hw_bytes is the hardware limit for the device, this setting is the software limit. Some devices exhibit large latencies when large discards are issued, setting this value lower will make Linux issue smaller discards and potentially help reduce latencies induced by large discard operations.

/sys/block/<disk>/queue/discard_max_hw_bytes

Defined on file sysfs-block

[RO] Devices that support discard functionality may have internal limits on the number of bytes that can be trimmed or unmapped in a single operation. The discard_max_hw_bytes parameter is set by the device driver to the maximum number of bytes that can be discarded in a single operation. Discard requests issued to the device must not exceed this limit. A discard_max_hw_bytes value of 0 means that the device does not support discard functionality.

/sys/block/<disk>/queue/discard_zeroes_data

Defined on file sysfs-block

[RO] Will always return 0. Don’t rely on any specific behavior for discards, and don’t read this file.

/sys/block/<disk>/queue/dma_alignment

Defined on file sysfs-block

Reports the alignment that user space addresses must have to be used for raw block device access with O_DIRECT and other driver specific passthrough mechanisms.

/sys/block/<disk>/queue/fua

Defined on file sysfs-block

[RO] Whether or not the block driver supports the FUA flag for write requests. FUA stands for Force Unit Access. If the FUA flag is set that means that write requests must bypass the volatile cache of the storage device.

/sys/block/<disk>/queue/hw_sector_size

Defined on file sysfs-block

[RO] This is the hardware sector size of the device, in bytes.

/sys/block/<disk>/queue/independent_access_ranges/

Defined on file sysfs-block

[RO] The presence of this sub-directory of the /sys/block/xxx/queue/ directory indicates that the device is capable of executing requests targeting different sector ranges in parallel. For instance, single LUN multi-actuator hard-disks will have an independent_access_ranges directory if the device correctly advertises the sector ranges of its actuators.

The independent_access_ranges directory contains one directory per access range, with each range described using the sector (RO) attribute file to indicate the first sector of the range and the nr_sectors (RO) attribute file to indicate the total number of sectors in the range starting from the first sector of the range. For example, a dual-actuator hard-disk will have the following independent_access_ranges entries.:

    $ tree /sys/block/<disk>/queue/independent_access_ranges/
    /sys/block/<disk>/queue/independent_access_ranges/
    |-- 0
    |   |-- nr_sectors
    |   `-- sector
    `-- 1
        |-- nr_sectors
        `-- sector

The sector and nr_sectors attributes use 512B sector unit, regardless of the actual block size of the device. Independent access ranges do not overlap and include all sectors within the device capacity. The access ranges are numbered in increasing order of the range start sector, that is, the sector attribute of range 0 always has the value 0.

/sys/block/<disk>/queue/io_poll

Defined on file sysfs-block

[RW] When read, this file shows whether polling is enabled (1) or disabled (0). Writing ‘0’ to this file will disable polling for this device. Writing any non-zero value will enable this feature.

/sys/block/<disk>/queue/io_poll_delay

Defined on file sysfs-block

[RW] This was used to control what kind of polling will be performed. It is now fixed to -1, which is classic polling. In this mode, the CPU will repeatedly ask for completions without giving up any time. <deprecated>

/sys/block/<disk>/queue/io_timeout

Defined on file sysfs-block

[RW] io_timeout is the request timeout in milliseconds. If a request does not complete in this time then the block driver timeout handler is invoked. That timeout handler can decide to retry the request, to fail it or to start a device recovery strategy.

/sys/block/<disk>/queue/iostats

Defined on file sysfs-block

[RW] This file is used to control (on/off) the iostats accounting of the disk.

/sys/block/<disk>/queue/iostats_passthrough

Defined on file sysfs-block

[RW] This file is used to control (on/off) the iostats accounting of the disk for passthrough commands.

/sys/block/<disk>/queue/logical_block_size

Defined on file sysfs-block

[RO] This is the smallest unit the storage device can address. It is typically 512 bytes.

/sys/block/<disk>/queue/max_active_zones

Defined on file sysfs-block

[RO] For zoned block devices (zoned attribute indicating “host-managed” or “host-aware”), the sum of zones belonging to any of the zone states: EXPLICIT OPEN, IMPLICIT OPEN or CLOSED, is limited by this value. If this value is 0, there is no limit.

If the host attempts to exceed this limit, the driver should report this error with BLK_STS_ZONE_ACTIVE_RESOURCE, which user space may see as the EOVERFLOW errno.

/sys/block/<disk>/queue/max_discard_segments

Defined on file sysfs-block

[RO] The maximum number of DMA scatter/gather entries in a discard request.

/sys/block/<disk>/queue/max_hw_sectors_kb

Defined on file sysfs-block

[RO] This is the maximum number of kilobytes supported in a single data transfer.

/sys/block/<disk>/queue/max_integrity_segments

Defined on file sysfs-block

[RO] Maximum number of elements in a DMA scatter/gather list with integrity data that will be submitted by the block layer core to the associated block driver.

/sys/block/<disk>/queue/max_open_zones

Defined on file sysfs-block

[RO] For zoned block devices (zoned attribute indicating “host-managed” or “host-aware”), the sum of zones belonging to any of the zone states: EXPLICIT OPEN or IMPLICIT OPEN, is limited by this value. If this value is 0, there is no limit.

/sys/block/<disk>/queue/max_sectors_kb

Defined on file sysfs-block

[RW] This is the maximum number of kilobytes that the block layer will allow for a filesystem request. Must be smaller than or equal to the maximum size allowed by the hardware. Write 0 to use default kernel settings.

/sys/block/<disk>/queue/max_segment_size

Defined on file sysfs-block

[RO] Maximum size in bytes of a single element in a DMA scatter/gather list.

/sys/block/<disk>/queue/max_segments

Defined on file sysfs-block

[RO] Maximum number of elements in a DMA scatter/gather list that is submitted to the associated block driver.

/sys/block/<disk>/queue/minimum_io_size

Defined on file sysfs-block

[RO] Storage devices may report a granularity or preferred minimum I/O size which is the smallest request the device can perform without incurring a performance penalty. For disk drives this is often the physical block size. For RAID arrays it is often the stripe chunk size. A properly aligned multiple of minimum_io_size is the preferred request size for workloads where a high number of I/O operations is desired.

/sys/block/<disk>/queue/nomerges

Defined on file sysfs-block

[RW] Standard I/O elevator operations include attempts to merge contiguous I/Os. For known random I/O loads these attempts will always fail and result in extra cycles being spent in the kernel. This allows one to turn off this behavior on one of two ways: When set to 1, complex merge checks are disabled, but the simple one-shot merges with the previous I/O request are enabled. When set to 2, all merge tries are disabled. The default value is 0 - which enables all types of merge tries.

/sys/block/<disk>/queue/nr_requests

Defined on file sysfs-block

[RW] This controls how many requests may be allocated in the block layer for read or write requests. Note that the total allocated number may be twice this amount, since it applies only to reads or writes (not the accumulated sum).

To avoid priority inversion through request starvation, a request queue maintains a separate request pool per each cgroup when CONFIG_BLK_CGROUP is enabled, and this parameter applies to each such per-block-cgroup request pool. IOW, if there are N block cgroups, each request queue may have up to N request pools, each independently regulated by nr_requests.

/sys/block/<disk>/queue/nr_zones

Defined on file sysfs-block

[RO] nr_zones indicates the total number of zones of a zoned block device (“host-aware” or “host-managed” zone model). For regular block devices, the value is always 0.

/sys/block/<disk>/queue/optimal_io_size

Defined on file sysfs-block

[RO] Storage devices may report an optimal I/O size, which is the device’s preferred unit for sustained I/O. This is rarely reported for disk drives. For RAID arrays it is usually the stripe width or the internal track size. A properly aligned multiple of optimal_io_size is the preferred request size for workloads where sustained throughput is desired. If no optimal I/O size is reported this file contains 0.

/sys/block/<disk>/queue/physical_block_size

Defined on file sysfs-block

[RO] This is the smallest unit a physical storage device can write atomically. It is usually the same as the logical block size but may be bigger. One example is SATA drives with 4KB sectors that expose a 512-byte logical block size to the operating system. For stacked block devices the physical_block_size variable contains the maximum physical_block_size of the component devices.

/sys/block/<disk>/queue/read_ahead_kb

Defined on file sysfs-block

[RW] Maximum number of kilobytes to read-ahead for filesystems on this block device.

For MADV_HUGEPAGE, the readahead size may exceed this setting since its granularity is based on the hugepage size.

/sys/block/<disk>/queue/rotational

Defined on file sysfs-block

[RW] This file is used to stat if the device is of rotational type or non-rotational type.

/sys/block/<disk>/queue/rq_affinity

Defined on file sysfs-block

[RW] If this option is ‘1’, the block layer will migrate request completions to the cpu “group” that originally submitted the request. For some workloads this provides a significant reduction in CPU cycles due to caching effects.

For storage configurations that need to maximize distribution of completion processing setting this option to ‘2’ forces the completion to run on the requesting cpu (bypassing the “group” aggregation logic).

/sys/block/<disk>/queue/scheduler

Defined on file sysfs-block

[RW] When read, this file will display the current and available IO schedulers for this block device. The currently active IO scheduler will be enclosed in [] brackets. Writing an IO scheduler name to this file will switch control of this block device to that new IO scheduler. Note that writing an IO scheduler name to this file will attempt to load that IO scheduler module, if it isn’t already present in the system.

/sys/block/<disk>/queue/stable_writes

Defined on file sysfs-block

[RW] This file will contain ‘1’ if memory must not be modified while it is being used in a write request to this device. When this is the case and the kernel is performing writeback of a page, the kernel will wait for writeback to complete before allowing the page to be modified again, rather than allowing immediate modification as is normally the case. This restriction arises when the device accesses the memory multiple times where the same data must be seen every time -- for example, once to calculate a checksum and once to actually write the data. If no such restriction exists, this file will contain ‘0’. This file is writable for testing purposes.

/sys/block/<disk>/queue/virt_boundary_mask

Defined on file sysfs-block

[RO] This file shows the I/O segment memory alignment mask for the block device. I/O requests to this device will be split between segments wherever either the memory address of the end of the previous segment or the memory address of the beginning of the current segment is not aligned to virt_boundary_mask + 1 bytes.

/sys/block/<disk>/queue/wbt_lat_usec

Defined on file sysfs-block

[RW] If the device is registered for writeback throttling, then this file shows the target minimum read latency. If this latency is exceeded in a given window of time (see wb_window_usec), then the writeback throttling will start scaling back writes. Writing a value of ‘0’ to this file disables the feature. Writing a value of ‘-1’ to this file resets the value to the default setting.

/sys/block/<disk>/queue/write_cache

Defined on file sysfs-block

[RW] When read, this file will display whether the device has write back caching enabled or not. It will return “write back” for the former case, and “write through” for the latter. Writing to this file can change the kernels view of the device, but it doesn’t alter the device state. This means that it might not be safe to toggle the setting from “write back” to “write through”, since that will also eliminate cache flushes issued by the kernel.

/sys/block/<disk>/queue/write_same_max_bytes

Defined on file sysfs-block

[RO] Some devices support a write same operation in which a single data block can be written to a range of several contiguous blocks on storage. This can be used to wipe areas on disk or to initialize drives in a RAID configuration. write_same_max_bytes indicates how many bytes can be written in a single write same command. If write_same_max_bytes is 0, write same is not supported by the device.

/sys/block/<disk>/queue/write_zeroes_max_bytes

Defined on file sysfs-block

[RO] Devices that support write zeroes operation in which a single request can be issued to zero out the range of contiguous blocks on storage without having any payload in the request. This can be used to optimize writing zeroes to the devices. write_zeroes_max_bytes indicates how many bytes can be written in a single write zeroes command. If write_zeroes_max_bytes is 0, write zeroes is not supported by the device.

/sys/block/<disk>/queue/zone_append_max_bytes

Defined on file sysfs-block

[RO] This is the maximum number of bytes that can be written to a sequential zone of a zoned block device using a zone append write operation (REQ_OP_ZONE_APPEND). This value is always 0 for regular block devices.

/sys/block/<disk>/queue/zone_write_granularity

Defined on file sysfs-block

[RO] This indicates the alignment constraint, in bytes, for write operations in sequential zones of zoned block devices (devices with a zoned attributed that reports “host-managed” or “host-aware”). This value is always 0 for regular block devices.

/sys/block/<disk>/queue/zoned

Defined on file sysfs-block

[RO] zoned indicates if the device is a zoned block device and the zone model of the device if it is indeed zoned. The possible values indicated by zoned are “none” for regular block devices and “host-aware” or “host-managed” for zoned block devices. The characteristics of host-aware and host-managed zoned block devices are described in the ZBC (Zoned Block Commands) and ZAC (Zoned Device ATA Command Set) standards. These standards also define the “drive-managed” zone model. However, since drive-managed zoned block devices do not support zone commands, they will be treated as regular block devices and zoned will report “none”.

/sys/block/<disk>/stat

Defined on file sysfs-block

The /sys/block/<disk>/stat files displays the I/O statistics of disk <disk>. They contain 11 fields:

1 | reads completed successfully
2 | reads merged
3 | sectors read
4 | time spent reading (ms)
5 | writes completed
6 | writes merged
7 | sectors written
8 | time spent writing (ms)
9 | I/Os currently in progress
10 | time spent doing I/Os (ms)
11 | weighted time spent doing I/Os (ms)
12 | discards completed
13 | discards merged
14 | sectors discarded
15 | time spent discarding (ms)
16 | flush requests completed
17 | time spent flushing (ms)

For more details refer I/O statistics fields

## Symbols under /sys/bus

/sys/bus/dsa/devices/dsa<m>/cdev_major

Defined on file sysfs-driver-dma-idxd

The major number that the character device driver assigned to this device.

/sys/bus/dsa/devices/dsa<m>/cmd_status

Defined on file sysfs-driver-dma-idxd

The last executed device administrative command’s status/error. Also last configuration error overloaded. Writing to it will clear the status.

/sys/bus/dsa/devices/dsa<m>/configurable

Defined on file sysfs-driver-dma-idxd

To indicate if this device is configurable or not.

/sys/bus/dsa/devices/dsa<m>/engine<m>.<n>

Defined on file sysfs-driver-dma-idxd

The assigned engine under this device.

/sys/bus/dsa/devices/dsa<m>/errors

Defined on file sysfs-driver-dma-idxd

The error information for this device.

/sys/bus/dsa/devices/dsa<m>/event_log_size

Defined on file sysfs-driver-dma-idxd

The event log size to be configured. Default is 64 entries and occupies 4k size if the evl entry is 64 bytes. It’s visible only on platforms that support the capability.

/sys/bus/dsa/devices/dsa<m>/group<m>.<n>

Defined on file sysfs-driver-dma-idxd

The assigned group under this device.

/sys/bus/dsa/devices/dsa<m>/iaa_cap

Defined on file sysfs-driver-dma-idxd

IAA (IAX) capability mask. Exported to user space for application consumption. This attribute should only be visible on IAA devices that are version 2 or later.

/sys/bus/dsa/devices/dsa<m>/max_batch_size

Defined on file sysfs-driver-dma-idxd

The largest number of work descriptors in a batch. It’s not visible when the device does not support batch.

/sys/bus/dsa/devices/dsa<m>/max_engines

Defined on file sysfs-driver-dma-idxd

The maximum number of engines supported by this device.

/sys/bus/dsa/devices/dsa<m>/max_groups

Defined on file sysfs-driver-dma-idxd

The maximum number of groups can be created under this device.

/sys/bus/dsa/devices/dsa<m>/max_read_buffers

Defined on file sysfs-driver-dma-idxd

The total number of read buffers supported by this device. The read buffers represent resources within the DSA implementation, and these resources are allocated by engines to support operations. See DSA spec v1.2 9.2.4 Total Read Buffers. It’s not visible when the device does not support Read Buffer allocation control.

/sys/bus/dsa/devices/dsa<m>/max_transfer_size

Defined on file sysfs-driver-dma-idxd

The number of bytes to be read from the source address to perform the operation. The maximum transfer size is dependent on the workqueue the descriptor was submitted to.

/sys/bus/dsa/devices/dsa<m>/max_work_queues

Defined on file sysfs-driver-dma-idxd

The maximum work queue number that this device supports.

/sys/bus/dsa/devices/dsa<m>/max_work_queues_size

Defined on file sysfs-driver-dma-idxd

The maximum work queue size supported by this device.

/sys/bus/dsa/devices/dsa<m>/numa_node

Defined on file sysfs-driver-dma-idxd

The numa node number for this device.

/sys/bus/dsa/devices/dsa<m>/op_cap

Defined on file sysfs-driver-dma-idxd

The operation capability bit mask specify the operation types supported by the this device.

/sys/bus/dsa/devices/dsa<m>/pasid_enabled

Defined on file sysfs-driver-dma-idxd

To indicate if user PASID (process address space identifier) is enabled or not for this device.

/sys/bus/dsa/devices/dsa<m>/read_buffer_limit

Defined on file sysfs-driver-dma-idxd

The maximum number of read buffers that may be in use at one time by operations that access low bandwidth memory in the device. See DSA spec v1.2 9.2.8 GENCFG on Global Read Buffer Limit. It’s not visible when the device does not support Read Buffer allocation control.

/sys/bus/dsa/devices/dsa<m>/state

Defined on file sysfs-driver-dma-idxd

The state information of this device. It can be either enabled or disabled.

/sys/bus/dsa/devices/dsa<m>/version

Defined on file sysfs-driver-dma-idxd

The hardware version number.

/sys/bus/dsa/devices/dsa<m>/wq<m>.<n>

Defined on file sysfs-driver-dma-idxd

The assigned work queue under this device.

/sys/bus/dsa/devices/engine<m>.<n>/group_id

Defined on file sysfs-driver-dma-idxd

The group that this engine belongs to.

/sys/bus/dsa/devices/group<m>.<n>/batch_progress_limit

Defined on file sysfs-driver-dma-idxd

Allows control of the number of batch descriptors that can be concurrently processed by an engine in the group as a fraction of the Maximum Batch Descriptors in Progress value specified in the ENGCAP register. The acceptable values are 0 (default), 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of the max value). It’s visible only on platforms that support the capability.

/sys/bus/dsa/devices/group<m>.<n>/desc_progress_limit

Defined on file sysfs-driver-dma-idxd

Allows control of the number of work descriptors that can be concurrently processed by an engine in the group as a fraction of the Maximum Work Descriptors in Progress value specified in the ENGCAP register. The acceptable values are 0 (default), 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of the max value). It’s visible only on platforms that support the capability.

/sys/bus/dsa/devices/group<m>.<n>/read_buffers_allowed

Defined on file sysfs-driver-dma-idxd

Indicates max number of read buffers that may be in use at one time by all engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read Buffers Allowed. It’s not visible when the device does not support Read Buffer allocation control.

/sys/bus/dsa/devices/group<m>.<n>/read_buffers_reserved

Defined on file sysfs-driver-dma-idxd

Indicates the number of Read Buffers reserved for the use of engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read Buffers Reserved. It’s not visible when the device does not support Read Buffer allocation control.

/sys/bus/dsa/devices/group<m>.<n>/use_read_buffer_limit

Defined on file sysfs-driver-dma-idxd

Enable the use of global read buffer limit for the group. See DSA spec v1.2 9.2.18 GRPCFG Use Global Read Buffer Limit. It’s not visible when the device does not support Read Buffer allocation control.

/sys/bus/dsa/devices/wq<m>.<n>/ats_disable

Defined on file sysfs-driver-dma-idxd

Indicate whether ATS disable is turned on for the workqueue. 0 indicates ATS is on, and 1 indicates ATS is off for the workqueue.

/sys/bus/dsa/devices/wq<m>.<n>/block_on_fault

Defined on file sysfs-driver-dma-idxd

To indicate block on fault is allowed or not for the work queue to support on demand paging.

/sys/bus/dsa/devices/wq<m>.<n>/cdev_minor

Defined on file sysfs-driver-dma-idxd

The minor number assigned to this work queue by the character device driver.

/sys/bus/dsa/devices/wq<m>.<n>/driver_name

Defined on file sysfs-driver-dma-idxd

Name of driver to be bounded to the wq.

/sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_fault_failures

Defined on file sysfs-driver-dma-idxd

Show the number of Completion Record (CR) faults failures that this application has caused. The failure counter is incremented when the driver cannot fault in the address for the CR. Typically this is caused by a bad address programmed in the submitted descriptor or a malicious submitter is using bad CR address on purpose.

/sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_faults

Defined on file sysfs-driver-dma-idxd

Show the number of Completion Record (CR) faults this application has caused.

/sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/pid

Defined on file sysfs-driver-dma-idxd

Show the process id of the application that opened the file. This is helpful information for a monitor daemon that wants to kill the application that opened the file.

/sys/bus/dsa/devices/wq<m>.<n>/enqcmds_retries

Defined on file sysfs-driver-dma-idxd

Indicate the number of retires for an enqcmds submission on a sharedwq. A max value to set attribute is capped at 64.

/sys/bus/dsa/devices/wq<m>.<n>/group_id

Defined on file sysfs-driver-dma-idxd

The group id that this work queue belongs to.

/sys/bus/dsa/devices/wq<m>.<n>/max_batch_size

Defined on file sysfs-driver-dma-idxd

The max batch size for this workqueue. Cannot exceed device max batch size. Configurable parameter. It’s not visible when the device does not support batch.

/sys/bus/dsa/devices/wq<m>.<n>/max_transfer_size

Defined on file sysfs-driver-dma-idxd

The max transfer sized for this workqueue. Cannot exceed device max transfer size. Configurable parameter.

/sys/bus/dsa/devices/wq<m>.<n>/mode

Defined on file sysfs-driver-dma-idxd

The work queue mode type for this work queue.

/sys/bus/dsa/devices/wq<m>.<n>/occupancy

Defined on file sysfs-driver-dma-idxd

Show the current number of entries in this WQ if WQ Occupancy Support bit WQ capabilities is 1.

/sys/bus/dsa/devices/wq<m>.<n>/op_config

Defined on file sysfs-driver-dma-idxd

Shows the operation capability bits displayed in bitmap format presented by %*pb `printk()` output format specifier. The attribute can be configured when the WQ is disabled in order to configure the WQ to accept specific bits that correlates to the operations allowed. It’s visible only on platforms that support the capability.

/sys/bus/dsa/devices/wq<m>.<n>/priority

Defined on file sysfs-driver-dma-idxd

The priority value of this work queue, it is a value relative to other work queue in the same group to control quality of service for dispatching work from multiple workqueues in the same group.

/sys/bus/dsa/devices/wq<m>.<n>/prs_disable

Defined on file sysfs-driver-dma-idxd

Controls whether PRS disable is turned on for the workqueue. 0 indicates PRS is on, and 1 indicates PRS is off for the workqueue. This option overrides block_on_fault attribute if set. It’s visible only on platforms that support the capability.

/sys/bus/dsa/devices/wq<m>.<n>/size

Defined on file sysfs-driver-dma-idxd

The work queue size for this work queue.

/sys/bus/dsa/devices/wq<m>.<n>/state

Defined on file sysfs-driver-dma-idxd

The current state of the work queue.

/sys/bus/dsa/devices/wq<m>.<n>/threshold

Defined on file sysfs-driver-dma-idxd

The number of entries in this work queue that may be filled via a limited portal.

/sys/bus/dsa/devices/wq<m>.<n>/type

Defined on file sysfs-driver-dma-idxd

The type of this work queue, it can be “kernel” type for work queue usages in the kernel space or “user” type for work queue usages by applications in user space.

/sys/bus/firewire/devices/*/

Defined on file sysfs-bus-firewire

Attributes common to IEEE 1394 node devices and unit devices. Read-only. Mutable during the node device’s lifetime. Immutable during the unit device’s lifetime. See IEEE 1212 for semantic definitions.

These attributes are only created if the root directory of an IEEE 1394 node or the unit directory of an IEEE 1394 unit actually contains according entries.

hardware_version

  Hexadecimal string representation of an u24.

hardware_version_name

  Contents of a respective textual descriptor leaf.

model

  Hexadecimal string representation of an u24.

model_name

  Contents of a respective textual descriptor leaf.

specifier_id

  Hexadecimal string representation of an u24. Mandatory in unit directories according to IEEE 1212.

vendor

  Hexadecimal string representation of an u24. Mandatory in the root directory according to IEEE 1212.

vendor_name

  Contents of a respective textual descriptor leaf.

version

  Hexadecimal string representation of an u24. Mandatory in unit directories according to IEEE 1212.

/sys/bus/firewire/devices/fw[0-9]+/

Defined on file sysfs-bus-firewire

IEEE 1394 node device attributes. Read-only. Mutable during the node device’s lifetime. See IEEE 1212 for semantic definitions.

config_rom

  Contents of the Configuration ROM register. Binary attribute; an array of host-endian u32.

guid

  The node’s EUI-64 in the bus information block of Configuration ROM. Hexadecimal string representation of an u64.

/sys/bus/firewire/devices/fw[0-9]+/is_local

Defined on file sysfs-bus-firewire

IEEE 1394 node device attribute. Read-only and immutable. Values: 1: The sysfs entry represents a local node (a controller card).

> 0: The sysfs entry represents a remote node.

/sys/bus/firewire/devices/fw[0-9]+/units

Defined on file sysfs-bus-firewire

IEEE 1394 node device attribute. Read-only. Mutable during the node device’s lifetime. See IEEE 1212 for semantic definitions.

units

  Summary of all units present in an IEEE 1394 node. Contains space-separated tuples of specifier_id and version of each unit present in the node. Specifier_id and version are hexadecimal string representations of u24 of the respective unit directory entries. Specifier_id and version within each tuple are separated by a colon.

Users: udev rules to set ownership and access permissions or ACLs of /dev/fw[0-9]+ character device files

/sys/bus/firewire/devices/fw[0-9]+[.][0-9]+/

Defined on file sysfs-bus-firewire

IEEE 1394 unit device attributes. Read-only. Immutable during the unit device’s lifetime. See IEEE 1212 for semantic definitions.

modalias

  Same as MODALIAS in the uevent at device creation.

rom_index

  Offset of the unit directory within the parent device’s (node device’s) Configuration ROM, in quadlets. Decimal string representation.

/sys/bus/firewire/drivers/sbp2/fw*/host*/target*/*:*:*:*/ieee1394_id

Defined on file sysfs-bus-firewire

SCSI target port identifier and logical unit identifier of a logical unit of an SBP-2 target. The identifiers are specified in SAM-2...SAM-4 annex A. They are persistent and world-wide unique properties the SBP-2 attached target.

Read-only attribute, immutable during the target’s lifetime. Format, as exposed by firewire-sbp2 since 2.6.22, May 2007: Colon-separated hexadecimal string representations of

> u64 EUI-64 : u24 directory_ID : u16 LUN

without 0x prefixes, without whitespace. The former sbp2 driver (removed in 2.6.37 after being superseded by firewire-sbp2) used a somewhat shorter format which was not as close to SAM.

Users: udev rules to create /dev/disk/by-id/ symlinks

/sys/bus/fsl-mc/autorescan

Defined on file sysfs-bus-fsl-mc

Writing a zero value to this attribute will disable the DPRC IRQs on which automatic rescan of the fsl-mc bus is performed. A non-zero value will enable the DPRC IRQs.

Users: Userspace drivers and management tools

/sys/bus/fsl-mc/rescan

Defined on file sysfs-bus-fsl-mc

Writing a non-zero value to this attribute will force a rescan of fsl-mc bus in the system and synchronize the objects under fsl-mc bus and the Management Complex firmware.

Users: Userspace drivers and management tools

/sys/bus/mhi/devices/.../oem_pk_hash

Defined on file sysfs-bus-mhi

The file holds the OEM PK Hash value of the endpoint device obtained using a BHI (Boot Host Interface) register read after at least one attempt to power up the device has been done. If read without having the device power on at least once, the file will read all 0’s.

Users: Any userspace application or clients interested in device info.

/sys/bus/mhi/devices/.../serialnumber

Defined on file sysfs-bus-mhi

The file holds the serial number of the client device obtained using a BHI (Boot Host Interface) register read after at least one attempt to power up the device has been done. If read without having the device power on at least once, the file will read all 0’s.

Users: Any userspace application or clients interested in device info.

/sys/bus/mhi/devices/.../soc_reset

Defined on file sysfs-bus-mhi

Initiates a SoC reset on the MHI controller. A SoC reset is a reset of last resort, and will require a complete re-init. This can be useful as a method of recovery if the device is non-responsive, or as a means of loading new firmware as a system administration task.

/sys/bus/mhi/devices/.../trigger_edl

Defined on file sysfs-bus-mhi

Writing a non-zero value to this file will force devices to enter EDL (Emergency Download) mode. This entry only exists for devices capable of entering the EDL mode using the standard EDL triggering mechanism defined in the MHI spec v1.2. Once in EDL mode, the flash programmer image can be downloaded to the device to enter the flash programmer execution environment. This can be useful if user wants to use QDL (Qualcomm Download, which is used to download firmware over EDL) to update firmware.

/sys/bus/nvmem/devices/.../force_ro

Defined on file sysfs-bus-nvmem

This read/write attribute allows users to set read-write devices as read-only and back to read-write from userspace. This can be used to unlock and relock write-protection of devices which are generally locked, except during sporadic programming operation. Read returns ‘0’ or ‘1’ for read-write or read-only modes respectively. Write parses one of ‘YyTt1NnFf0’, or [oO][NnFf] for “on” and “off”, i.e. what `kstrtobool()` supports. Note: This file is only present if CONFIG_NVMEM_SYSFS is enabled.

/sys/bus/nvmem/devices/.../nvmem

Defined on file sysfs-bus-nvmem

This file allows user to read/write the raw NVMEM contents. Permissions for write to this file depends on the nvmem provider configuration. Note: This file is only present if CONFIG_NVMEM_SYSFS is enabled

ex:

    hexdump /sys/bus/nvmem/devices/qfprom0/nvmem

    0000000 0000 0000 0000 0000 0000 0000 0000 0000
    *
    00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
    0000000 0000 0000 0000 0000 0000 0000 0000 0000
    ...
    *
    0001000

/sys/bus/nvmem/devices/.../type

Defined on file sysfs-bus-nvmem

This read-only attribute allows user to read the NVMEM device type. Supported types are “Unknown”, “EEPROM”, “OTP”, “Battery backed”, “FRAM”. Note: This file is only present if CONFIG_NVMEM_SYSFS is enabled.

/sys/bus/pci/drivers/qla2xxx/.../devices/*

Defined on file sysfs-driver-qla2xxx

qla2xxx-udev.sh currently looks for uevent CHANGE events to signal a firmware-dump has been generated by the driver and is ready for retrieval.

Users: qla2xxx-udev.sh. Proposed changes should be mailed to linux-driver@qlogic.com

/sys/bus/platform/drivers/aspeed-vuart/*/lpc_address

Defined on file sysfs-driver-aspeed-vuart

Configures which IO port the host side of the UART will appear on the host <-> BMC LPC bus.

Users: OpenBMC. Proposed changes should be mailed to openbmc@lists.ozlabs.org

/sys/bus/platform/drivers/aspeed-vuart/*/sirq

Defined on file sysfs-driver-aspeed-vuart

Configures which interrupt number the host side of the UART will appear on the host <-> BMC LPC bus.

Users: OpenBMC. Proposed changes should be mailed to openbmc@lists.ozlabs.org

/sys/bus/platform/drivers/aspeed-vuart/*/sirq_polarity

Defined on file sysfs-driver-aspeed-vuart

Configures the polarity of the serial interrupt to the host via the BMC LPC bus. Set to 0 for active-low or 1 for active-high.

Users: OpenBMC. Proposed changes should be mailed to openbmc@lists.ozlabs.org

/sys/bus/usb/device/.../avoid_reset_quirk

Defined on file sysfs-bus-usb

Writing 1 to this file tells the kernel that this device will morph into another mode when it is reset. Drivers will not use reset for error handling for such devices.

Users:

usb_modeswitch

/sys/bus/usb/device/.../power/active_duration

Defined on file sysfs-bus-usb

If CONFIG_PM is enabled, then this file is present. When read, it returns the total time (in msec) that the USB device has been active, i.e. not in a suspended state. This file is read-only.

Tools can use this file and the connected_duration file to compute the percentage of time that a device has been active. For example:

    echo $((100 * `cat active_duration` / `cat connected_duration`))

will give an integer percentage. Note that this does not account for counter wrap.

Users:

PowerTOP <powertop@lists.01.org> https://01.org/powertop/

/sys/bus/usb/device/.../power/connected_duration

Defined on file sysfs-bus-usb

If CONFIG_PM is enabled, then this file is present. When read, it returns the total time (in msec) that the USB device has been connected to the machine. This file is read-only.

Users:

PowerTOP <powertop@lists.01.org> https://01.org/powertop/

/sys/bus/usb/devices/.../bConfigurationValue

Defined on file sysfs-bus-usb

bConfigurationValue of the active configuration for the device. Writing 0 or -1 to bConfigurationValue will reset the active configuration (unconfigure the device). Writing another value will change the active configuration.

Note that some devices, in violation of the USB spec, have a configuration with a value equal to 0. Writing 0 to bConfigurationValue for these devices will install that configuration, rather then unconfigure the device.

Writing -1 will always unconfigure the device.

Users:

libusb

/sys/bus/usb/devices/.../busnum

Defined on file sysfs-bus-usb

Bus-number of the USB-bus the device is connected to.

Users:

libusb

/sys/bus/usb/devices/.../descriptors

Defined on file sysfs-bus-usb

Binary file containing cached descriptors of the device. The binary data consists of the device descriptor followed by the descriptors for each configuration of the device. Note that the wTotalLength of the config descriptors can not be trusted, as the device may have a smaller config descriptor than it advertises. The bLength field of each (sub) descriptor can be trusted, and can be used to seek forward one (sub) descriptor at a time until the next config descriptor is found. All descriptors read from this file are in bus-endian format

Users:

libusb

/sys/bus/usb/devices/.../devnum

Defined on file sysfs-bus-usb

Device address on the USB bus.

Users:

libusb

/sys/bus/usb/devices/.../power/autosuspend

Defined on file sysfs-bus-usb

Each USB device directory will contain a file named power/autosuspend. This file holds the time (in seconds) the device must be idle before it will be autosuspended. 0 means the device will be autosuspended as soon as possible. Negative values will prevent the device from being autosuspended at all, and writing a negative value will resume the device if it is already suspended.

The autosuspend delay for newly-created devices is set to the value of the usbcore.autosuspend module parameter.

/sys/bus/usb/devices/.../power/persist

Defined on file sysfs-bus-usb

USB device directories can contain a file named power/persist. The file holds a boolean value (0 or 1) indicating whether or not the “USB-Persist” facility is enabled for the device. For hubs this facility is always enabled and their device directories will not contain this file.

For more information, see USB device persistence during system suspend.

/sys/bus/usb/devices/.../speed

Defined on file sysfs-bus-usb

Speed the device is connected with to the usb-host in Mbit / second. IE one of 1.5 / 12 / 480 / 5000.

Users:

libusb

/sys/bus/usb/devices/<busnum>-<port[.port]>...:<config num>-<interface num>/supports_autosuspend

Defined on file sysfs-bus-usb

When read, this file returns 1 if the interface driver for this interface supports autosuspend. It also returns 1 if no driver has claimed this interface, as an unclaimed interface will not stop the device from being autosuspended if all other interface drivers are idle. The file returns 0 if autosuspend support has not been added to the driver.

Users:

USB PM tool git://git.moblin.org/users/sarah/usb-pm-tool/

/sys/bus/usb/drivers/usbtmc/*/interface_capabilities
/sys/bus/usb/drivers/usbtmc/*/device_capabilities

Defined on file sysfs-driver-usb-usbtmc

These files show the various USB TMC capabilities as described by the device itself. The full description of the bitfields can be found in the USB TMC documents from the USB-IF entitled “Universal Serial Bus Test and Measurement Class Specification (USBTMC) Revision 1.0” section 4.2.1.8.

The files are read only.

/sys/bus/usb/drivers/usbtmc/*/usb488_interface_capabilities
/sys/bus/usb/drivers/usbtmc/*/usb488_device_capabilities

Defined on file sysfs-driver-usb-usbtmc

These files show the various USB TMC capabilities as described by the device itself. The full description of the bitfields can be found in the USB TMC documents from the USB-IF entitled “Universal Serial Bus Test and Measurement Class, Subclass USB488 Specification (USBTMC-USB488) Revision 1.0” section 4.2.2.

The files are read only.

/sys/bus/vmbus/devices/<UUID>/channel_vp_mapping

Defined on file sysfs-bus-vmbus

The mapping of which primary/sub channels are bound to which Virtual Processors. Format: <channel’s child_relid:the bound cpu’s number>

Users: tools/hv/lsvmbus

/sys/bus/vmbus/devices/<UUID>/channels/<N>

Defined on file sysfs-bus-vmbus

Directory for per-channel information NN is the VMBUS relid associated with the channel.

/sys/bus/vmbus/devices/<UUID>/channels/<N>/cpu

Defined on file sysfs-bus-vmbus

VCPU (sub)channel is affinitized to

Users: tools/hv/lsvmbus and other debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/events

Defined on file sysfs-bus-vmbus

Number of times we have signaled the host

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/in_mask

Defined on file sysfs-bus-vmbus

Host to guest channel interrupt mask

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/interrupts

Defined on file sysfs-bus-vmbus

Number of times we have taken an interrupt (incoming)

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_in_full

Defined on file sysfs-bus-vmbus

Number of guest to host interrupts caused by the inbound ring buffer transitioning from full to not full while a packet is waiting for buffer space to become available

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_out_empty

Defined on file sysfs-bus-vmbus

Number of guest to host interrupts caused by the outbound ring buffer transitioning from empty to not empty

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/latency

Defined on file sysfs-bus-vmbus

Channel signaling latency. This file is available only for performance critical channels (storage, network, etc.) that use the monitor page mechanism.

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/monitor_id

Defined on file sysfs-bus-vmbus

Monitor bit associated with channel. This file is available only for performance critical channels (storage, network, etc.) that use the monitor page mechanism.

Users: Debugging tools and userspace drivers

/sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_first

Defined on file sysfs-bus-vmbus

Number of write operations that were the first to encounter an outbound ring buffer full condition

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_total

Defined on file sysfs-bus-vmbus

Total number of write operations that encountered an outbound ring buffer full condition

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/out_mask

Defined on file sysfs-bus-vmbus

Guest to host channel interrupt mask

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/pending

Defined on file sysfs-bus-vmbus

Channel interrupt pending state. This file is available only for performance critical channels (storage, network, etc.) that use the monitor page mechanism.

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/read_avail

Defined on file sysfs-bus-vmbus

Bytes available to read

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/channels/<N>/ring

Defined on file sysfs-bus-vmbus

Binary file created by uio_hv_generic for ring buffer

Users: Userspace drivers

/sys/bus/vmbus/devices/<UUID>/channels/<N>/subchannel_id

Defined on file sysfs-bus-vmbus

Subchannel ID associated with VMBUS channel

Users: Debugging tools and userspace drivers

/sys/bus/vmbus/devices/<UUID>/channels/<N>/write_avail

Defined on file sysfs-bus-vmbus

Bytes available to write

Users: Debugging tools

/sys/bus/vmbus/devices/<UUID>/class_id

Defined on file sysfs-bus-vmbus

The VMBus interface type GUID of the device

Users: tools/hv/lsvmbus

/sys/bus/vmbus/devices/<UUID>/device

Defined on file sysfs-bus-vmbus

The 16 bit device ID of the device

Users: tools/hv/lsvmbus and user level RDMA libraries

/sys/bus/vmbus/devices/<UUID>/device_id

Defined on file sysfs-bus-vmbus

The VMBus interface instance GUID of the device

Users: tools/hv/lsvmbus

/sys/bus/vmbus/devices/<UUID>/id

Defined on file sysfs-bus-vmbus

The VMBus child_relid of the device’s primary channel

Users: tools/hv/lsvmbus

/sys/bus/vmbus/devices/<UUID>/numa_node

Defined on file sysfs-bus-vmbus

This NUMA node to which the VMBUS device is attached, or -1 if the node is unknown.

/sys/bus/vmbus/devices/<UUID>/vendor

Defined on file sysfs-bus-vmbus

The 16 bit vendor ID of the device

Users: tools/hv/lsvmbus and user level RDMA libraries

/sys/bus/vmbus/hibernation

Defined on file sysfs-bus-vmbus

Whether the host supports hibernation for the VM.

Users: Daemon that sets up swap partition/file for hibernation.

/sys/bus/w1/devices/.../eeprom

Defined on file sysfs-driver-w1_ds28e04

read/write the contents of the EEPROM memory of the DS28E04-100 see Kernel driver w1_ds28e04 for detailed information

Users: any user space application which wants to communicate with DS28E04-100

/sys/bus/w1/devices/.../offset

Defined on file sysfs-driver-w1_ds2438

write the contents to the offset register of the DS2438 see Kernel driver w1_ds2438 for detailed information

Users: any user space application which wants to communicate with DS2438

/sys/bus/w1/devices/.../page1

Defined on file sysfs-driver-w1_ds2438

read the contents of the page1 of the DS2438 see Kernel driver w1_ds2438 for detailed information

Users: any user space application which wants to communicate with DS2438

/sys/bus/w1/devices/.../pio

Defined on file sysfs-driver-w1_ds28e04

read/write the contents of the two PIO’s of the DS28E04-100 see Kernel driver w1_ds28e04 for detailed information

Users: any user space application which wants to communicate with DS28E04-100

/sys/bus/w1/devices/.../w1_master_timeout_us

Defined on file sysfs-bus-w1

Bus scanning interval, microseconds component. Some of 1-Wire devices commonly associated with physical access control systems are attached/generate presence for as short as 100 ms - hence the tens-to-hundreds milliseconds scan intervals are required.

see Introduction to the 1-wire (w1) subsystem for detailed information.

Users: any user space application which wants to know bus scanning interval

/sys/bus/w1/devices/.../w1_seq

Defined on file sysfs-driver-w1_ds28ea00

Support for the DS28EA00 chain sequence function see Kernel driver w1_therm for detailed information

Users: any user space application which wants to communicate with DS28EA00

/sys/bus/wmi/devices/05901221-D566-11D1-B2F0-00A0C9062910[-X]/bmof

Defined on file sysfs-platform-wmi-bmof

Binary MOF metadata used to describe the details of available ACPI WMI interfaces.

See WMI embedded Binary MOF driver for details.

/sys/bus/xen-backend/devices/*/devtype

Defined on file sysfs-bus-xen-backend

The type of the device. e.g., one of: ‘vbd’ (block), ‘vif’ (network), or ‘vfb’ (framebuffer).

/sys/bus/xen-backend/devices/*/nodename

Defined on file sysfs-bus-xen-backend

XenStore node (under /local/domain/NNN/) for this backend device.

/sys/bus/xen-backend/devices/*/state

Defined on file sysfs-bus-xen-backend

The state of the device. One of: ‘Unknown’, ‘Initialising’, ‘Initialised’, ‘Connected’, ‘Closing’, ‘Closed’, ‘Reconfiguring’, ‘Reconfigured’.

/sys/bus/xen-backend/devices/vbd-*/mode

Defined on file sysfs-bus-xen-backend

Whether the block device is read-only (‘r’) or read-write (‘w’).

/sys/bus/xen-backend/devices/vbd-*/physical_device

Defined on file sysfs-bus-xen-backend

The major:minor number (in hexadecimal) of the physical device providing the storage for this backend block device.

/sys/bus/xen-backend/devices/vbd-*/statistics/f_req

Defined on file sysfs-bus-xen-backend

Number of flush requests from the frontend.

/sys/bus/xen-backend/devices/vbd-*/statistics/oo_req

Defined on file sysfs-bus-xen-backend

Number of requests delayed because the backend was too busy processing previous requests.

/sys/bus/xen-backend/devices/vbd-*/statistics/rd_req

Defined on file sysfs-bus-xen-backend

Number of read requests from the frontend.

/sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect

Defined on file sysfs-bus-xen-backend

Number of sectors read by the frontend.

/sys/bus/xen-backend/devices/vbd-*/statistics/wr_req

Defined on file sysfs-bus-xen-backend

Number of write requests from the frontend.

/sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect

Defined on file sysfs-bus-xen-backend

Number of sectors written by the frontend.

## Symbols under /sys/class

/sys/class/backlight/<backlight>/actual_brightness

Defined on file sysfs-class-backlight

Show the actual brightness by querying the hardware.

Users: HAL

/sys/class/backlight/<backlight>/bl_power

Defined on file sysfs-class-backlight

Control BACKLIGHT power, values are compatible with FB_BLANK_* from fb.h

> - 0 (FB_BLANK_UNBLANK) : power on.

> - 4 (FB_BLANK_POWERDOWN) : power off

Users: HAL

/sys/class/backlight/<backlight>/brightness

Defined on file sysfs-class-backlight

Control the brightness for this <backlight>. Values are between 0 and max_brightness. This file will also show the brightness level stored in the driver, which may not be the actual brightness (see actual_brightness).

Users: HAL

/sys/class/backlight/<backlight>/max_brightness

Defined on file sysfs-class-backlight

Maximum brightness for <backlight>.

Users: HAL

/sys/class/backlight/<backlight>/type

Defined on file sysfs-class-backlight

The type of interface controlled by <backlight>. “firmware”: The driver uses a standard firmware interface “platform”: The driver uses a platform-specific interface “raw”: The driver controls hardware registers directly

In the general case, when multiple backlight interfaces are available for a single device, firmware control should be preferred to platform control should be preferred to raw control. Using a firmware interface reduces the probability of confusion with the hardware and the OS independently updating the backlight state. Platform interfaces are mostly a holdover from pre-standardisation of firmware interfaces.

/sys/class/bluetooth/hci<index>/reset

Defined on file sysfs-class-bluetooth

This write-only attribute allows users to trigger the vendor reset method on the Bluetooth device when arbitrary data is written. The reset may or may not be done through the device transport (e.g., UART/USB), and can also be done through an out-of-band approach such as GPIO.

/sys/class/infiniband/<device-name>/hw_counters/lifespan
/sys/class/infiniband/<device-name>/ports/<port-num>/hw_counters/lifespan

Defined on file sysfs-class-infiniband

The optional “hw_counters” subdirectory can be under either the parent device or the port subdirectories or both. If present, there are a list of counters provided by the hardware. They may match some of the counters in the counters directory, but they often include many other counters. In addition to the various counters, there will be a file named “lifespan” that configures how frequently the core should update the counters when they are being accessed (counters are not updated if they are not being accessed). The lifespan is in milliseconds and defaults to 10 unless set to something else by the driver. Users may echo a value between 0-10000 to the lifespan file to set the length of time between updates in milliseconds.

/sys/class/infiniband/<device>/fw_ver

Defined on file sysfs-class-infiniband

(RO) Display firmware version

/sys/class/infiniband/<device>/node_desc

Defined on file sysfs-class-infiniband

(RW) Update the node description with information such as the node’s hostname, so that IB network management software can tie its view to the real world.

/sys/class/infiniband/<device>/node_type
/sys/class/infiniband/<device>/node_guid
/sys/class/infiniband/<device>/sys_image_guid

Defined on file sysfs-class-infiniband

node_type: | (RO) Node type (CA, RNIC, usNIC, usNIC UDP, switch or router)
node_guid: | (RO) Node GUID
sys_image_guid: | (RO) System image GUID

/sys/class/infiniband/<device>/ports/<port-num>/counters/symbol_error
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_remote_physical_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_switch_relay_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/link_error_recovery
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_constraint_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_contraint_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/local_link_integrity_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/excessive_buffer_overrun_errors
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_data
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_data
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/unicast_rcv_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/unicast_xmit_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/multicast_rcv_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/multicast_xmit_packets
/sys/class/infiniband/<device>/ports/<port-num>/counters/link_downed
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_discards
/sys/class/infiniband/<device>/ports/<port-num>/counters/VL15_dropped
/sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_wait

Defined on file sysfs-class-infiniband

Errors info:

symbol_error: (RO) Total number of minor link errors detected on one or more physical lanes.

port_rcv_errors : (RO) Total number of packets containing an error that were received on the port.

port_rcv_remote_physical_errors : (RO) Total number of packets marked with the EBP delimiter received on the port.

port_rcv_switch_relay_errors : (RO) Total number of packets received on the port that were discarded because they could not be forwarded by the switch relay.

link_error_recovery: (RO) Total number of times the Port Training state machine has successfully completed the link error recovery process.

port_xmit_constraint_errors: (RO) Total number of packets not transmitted from the switch physical port due to outbound raw filtering or failing outbound partition or IP version check.

port_rcv_constraint_errors: (RO) Total number of packets received on the switch physical port that are discarded due to inbound raw filtering or failing inbound partition or IP version check.

local_link_integrity_errors: (RO) The number of times that the count of local physical errors exceeded the threshold specified by LocalPhyErrors

excessive_buffer_overrun_errors: (RO) This counter, indicates an input buffer overrun. It indicates possible misconfiguration of a port, either by the Subnet Manager (SM) or by user intervention. It can also indicate hardware issues or extremely poor link signal integrity

Data info:

port_xmit_data: (RO) Total number of data octets, divided by 4 (lanes), transmitted on all VLs. This is 64 bit counter

port_rcv_data: (RO) Total number of data octets, divided by 4 (lanes), received on all VLs. This is 64 bit counter.

port_xmit_packets: (RO) Total number of packets transmitted on all VLs from this port. This may include packets with errors. This is 64 bit counter.

port_rcv_packets: (RO) Total number of packets (this may include packets containing Errors. This is 64 bit counter.

link_downed: (RO) Total number of times the Port Training state machine has failed the link error recovery process and downed the link.

unicast_rcv_packets: (RO) Total number of unicast packets, including unicast packets containing errors.

unicast_xmit_packets: (RO) Total number of unicast packets transmitted on all VLs from the port. This may include unicast packets with errors.

multicast_rcv_packets: (RO) Total number of multicast packets, including multicast packets containing errors.

multicast_xmit_packets: (RO) Total number of multicast packets transmitted on all VLs from the port. This may include multicast packets with errors.

Misc info:

port_xmit_discards: (RO) Total number of outbound packets discarded by the port because the port is down or congested.

VL15_dropped: (RO) Number of incoming VL15 packets dropped due to resource limitations (e.g., lack of buffers) of the port.

port_xmit_wait: (RO) The number of ticks during which the port had data to transmit but no data was sent during the entire tick (either because of insufficient credits or because of lack of arbitration).

Each of these files contains the corresponding value from the port’s Performance Management PortCounters attribute, as described in the InfiniBand Architecture Specification.

/sys/class/infiniband/<device>/ports/<port-num>/lid
/sys/class/infiniband/<device>/ports/<port-num>/rate
/sys/class/infiniband/<device>/ports/<port-num>/lid_mask_count
/sys/class/infiniband/<device>/ports/<port-num>/sm_sl
/sys/class/infiniband/<device>/ports/<port-num>/sm_lid
/sys/class/infiniband/<device>/ports/<port-num>/state
/sys/class/infiniband/<device>/ports/<port-num>/phys_state
/sys/class/infiniband/<device>/ports/<port-num>/cap_mask

Defined on file sysfs-class-infiniband

lid: | (RO) Port LID
rate: | (RO) Port data rate (active width * active speed)
lid_mask_count: | (RO) Port LID mask count
sm_sl: | (RO) Subnet manager SL for port’s subnet
sm_lid: | (RO) Subnet manager LID for port’s subnet
state: | (RO) Port state (DOWN, INIT, ARMED, ACTIVE or ACTIVE_DEFER)
phys_state: | (RO) Port physical state (Sleep, Polling, LinkUp, etc)
cap_mask: | (RO) Port capability mask. 2 bits here are settable- IsCommunicationManagementSupported (set when CM module is loaded) and IsSM (set via open of issmN file).

/sys/class/infiniband/<device>/ports/<port-num>/link_layer

Defined on file sysfs-class-infiniband

(RO) Link layer type information (Infiniband or Ethernet type)

/sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/ndevs/<gid-index>

Defined on file sysfs-class-infiniband

The net-device’s name associated with the GID resides at index <gid-index>.

/sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/types/<gid-index>

Defined on file sysfs-class-infiniband

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 GIDs or “RoCE v2” for RoCE v2 based GIDs.

/sys/class/infiniband/bnxt_reX/hw_rev
/sys/class/infiniband/bnxt_reX/hca_type

Defined on file sysfs-class-infiniband

hw_rev: | (RO) | Hardware revision number
hca_type: | (RO) | Host channel adapter type

/sys/class/infiniband/cxgb4_X/hw_rev
/sys/class/infiniband/cxgb4_X/hca_type
/sys/class/infiniband/cxgb4_X/board_id

Defined on file sysfs-class-infiniband

hw_rev: | (RO) Hardware revision number
hca_type: | (RO) Driver short name. Should normally match the name in its bus driver structure (e.g. pci_driver::name)
board_id: | (RO) Manufacturing board id. (Vendor + device information)

sysfs interface for Intel IB driver qib

/sys/class/infiniband/hfi1_X/hw_rev
/sys/class/infiniband/hfi1_X/board_id
/sys/class/infiniband/hfi1_X/nctxts
/sys/class/infiniband/hfi1_X/serial
/sys/class/infiniband/hfi1_X/chip_reset
/sys/class/infiniband/hfi1_X/boardversion
/sys/class/infiniband/hfi1_X/nfreectxts
/sys/class/infiniband/hfi1_X/tempsense

Defined on file sysfs-class-infiniband

hw_rev: | (RO) Hardware revision number
board_id: | (RO) Manufacturing board id
nctxts: | (RO) Total contexts available.
serial: | (RO) Board serial number
chip_reset: | (WO) Write “reset” to this file to reset the chip if possible. Only allowed if no user contexts are open that use chip resources.
boardversion: | (RO) Human readable board info
nfreectxts: | (RO) The number of free user ports (contexts) available.
tempsense: | (RO) Thermal sense information

/sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_settings_bin
/sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_table_bin
/sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_prescan

Defined on file sysfs-class-infiniband

Per-port congestion control.

cc_table_bin | (RO) CCA tables used by PSM2 Congestion control table size followed by table entries. Binary attribute.
cc_settings_bin | (RO) Congestion settings: port control, control map and an array of 16 entries for the congestion entries - increase, timer, event log trigger threshold and the minimum injection rate delay. Binary attribute.
cc_prescan | (RW) enable prescanning for faster BECN response. Write “on” to enable and “off” to disable.

/sys/class/infiniband/hfi1_X/ports/<N>/sc2vl/[0-31]
/sys/class/infiniband/hfi1_X/ports/<N>/sl2sc/[0-31]
/sys/class/infiniband/hfi1_X/ports/<N>/vl2mtu/[0-15]

Defined on file sysfs-class-infiniband

sc2vl/: | (RO) 32 files (0 - 31) used to translate sl->vl
sl2sc/: | (RO) 32 files (0 - 31) used to translate sl->sc
vl2mtu/: | (RO) 16 files (0 - 15) used to determine MTU for vl

/sys/class/infiniband/hfi1_X/sdma_<N>/cpu_list
/sys/class/infiniband/hfi1_X/sdma_<N>/vl

Defined on file sysfs-class-infiniband

sdma<N>/ contains one directory per sdma engine (0 - 15)

cpu_list: | (RW) List of cpus for user-process to sdma engine assignment.
vl: | (RO) Displays the virtual lane (vl) the sdma engine maps to.

This interface gives the user control on the affinity settings for the device. As an example, to set an sdma engine irq affinity and thread affinity of a user processes to use the sdma engine, which is “near” in terms of NUMA configuration, or physical cpu location, the user will do:

    echo "3" > /proc/irq/<N>/smp_affinity_list
    echo "4-7" > /sys/devices/.../sdma3/cpu_list
    cat /sys/devices/.../sdma3/vl
    0
    echo "8" > /proc/irq/<M>/smp_affinity_list
    echo "9-12" > /sys/devices/.../sdma4/cpu_list
    cat /sys/devices/.../sdma4/vl
    1

to make sure that when a process runs on cpus 4,5,6, or 7, and uses vl=0, then sdma engine 3 is selected by the driver, and also the interrupt of the sdma engine 3 is steered to cpu 3. Similarly, when a process runs on cpus 9,10,11, or 12 and sets vl=1, then engine 4 will be selected and the irq of the sdma engine 4 is steered to cpu 8. This assumes that in the above N is the irq number of “sdma3”, and M is irq number of “sdma4” in the /proc/interrupts file.

sysfs interface for QLogic qedr NIC Driver

/sys/class/infiniband/mlx4_X/hw_rev
/sys/class/infiniband/mlx4_X/hca_type
/sys/class/infiniband/mlx4_X/board_id

Defined on file sysfs-class-infiniband

hw_rev: | (RO) Hardware revision number
hca_type: | (RO) Host channel adapter type
board_id: | (RO) Manufacturing board ID

/sys/class/infiniband/mlx4_X/iov/<pci-slot-num>/ports/<m>/smi_enabled
/sys/class/infiniband/mlx4_X/iov/<pci-slot-num>/ports/<m>/enable_smi_admin

Defined on file sysfs-class-infiniband

Enabling QP0 on VFs for selected VF/port. By default, no VFs are enabled for QP0 operation.

smi_enabled: | (RO) | Indicates whether smi is currently enabled for the indicated VF/port
enable_smi_admin: | (RW) | Used by the admin to request that smi capability be enabled or disabled for the indicated VF/port. 0 = disable, 1 = enable.

The requested enablement will occur at the next reset of the VF (e.g. driver restart on the VM which owns the VF).

sysfs interface for Chelsio T4/T5 RDMA driver (cxgb4)

/sys/class/infiniband/mlx4_X/iov/ports/<port-num>/gids/<n>
/sys/class/infiniband/mlx4_X/iov/ports/<port-num>/admin_guids/<n>
/sys/class/infiniband/mlx4_X/iov/ports/<port-num>/pkeys/<n>
/sys/class/infiniband/mlx4_X/iov/ports/<port-num>/mcgs/
/sys/class/infiniband/mlx4_X/iov/ports/<pci-slot-num>/ports/<m>/gid_idx/0
/sys/class/infiniband/mlx4_X/iov/ports/<pci-slot-num>/ports/<m>/pkey_idx/<n>

Defined on file sysfs-class-infiniband

The sysfs iov directory is used to manage and examine the port P_Key and guid paravirtualization. This directory is added only for the master -- slaves do not have it.

Under iov/ports, the administrator may examine the gid and P_Key tables as they are present in the device (and as are seen in the “network view” presented to the SM).

The “pkeys” and “gids” subdirectories contain one file for each entry in the port’s P_Key or GID table respectively. For example, ports/1/pkeys/10 contains the value at index 10 in port 1’s P_Key table.

gids/<n>: | (RO) The physical port gids n = 0..127
admin_guids/<n>: | (RW) Allows examining or changing the administrative state of a given GUID n = 0..127
pkeys/<n>: | (RO) Displays the contents of the physical key table n = 0..126
mcgs/: | (RO) Multicast group table
<m>/gid_idx/0: | (RO) Display the GID mapping m = 1..2
<m>/pkey_idx/<n>: | (RW) Writable except for RoCE pkeys. m = 1..2, n = 0..126 Under the iov/<pci slot number> directories, the admin may map the index numbers in the physical tables (as under iov/ports) to the paravirtualized index numbers that guests see. For example, if the administrator, for port 1 on guest 2 maps physical pkey index 10 to virtual index 1, then that guest, whenever it uses its pkey index 1, will actually be using the real pkey index 10.

/sys/class/infiniband/mlx5_X/hw_rev
/sys/class/infiniband/mlx5_X/hca_type
/sys/class/infiniband/mlx5_X/reg_pages
/sys/class/infiniband/mlx5_X/fw_pages

Defined on file sysfs-class-infiniband

[to be documented]

sysfs interface for Cisco VIC (usNIC) Verbs Driver

/sys/class/infiniband/mthcaX/hw_rev
/sys/class/infiniband/mthcaX/hca_type
/sys/class/infiniband/mthcaX/board_id

Defined on file sysfs-class-infiniband

hw_rev: | (RO) Hardware revision number
hca_type: | (RO) Host Channel Adapter type: MT23108, MT25208 (MT23108 compat mode), MT25208 or MT25204
board_id: | (RO) Manufacturing board ID

sysfs interface for Mellanox ConnectX HCA IB driver (mlx4)

/sys/class/infiniband/ocrdmaX/hca_type

Defined on file sysfs-class-infiniband

hca_type: (RO) Display FW version

sysfs interface for Intel Omni-Path driver (HFI1)

/sys/class/infiniband/ocrdmaX/hw_rev

Defined on file sysfs-class-infiniband

hw_rev: (RO) Hardware revision number

/sys/class/infiniband/qedrX/hw_rev
/sys/class/infiniband/qedrX/hca_type

Defined on file sysfs-class-infiniband

hw_rev: | (RO) | Hardware revision number
hca_type: | (RO) | Display HCA type

sysfs interface for VMware Paravirtual RDMA driver

/sys/class/infiniband/qibX/ports/<N>/CCMgtA/cc_settings_bin
/sys/class/infiniband/qibX/ports/<N>/CCMgtA/cc_table_bin

Defined on file sysfs-class-infiniband

Per-port congestion control. Both are binary attributes.

cc_table_bin | (RO) Congestion control table size followed by table entries.
cc_settings_bin | (RO) Congestion settings: port control, control map and an array of 16 entries for the congestion entries - increase, timer, event log trigger threshold and the minimum injection rate delay.

/sys/class/infiniband/qibX/ports/<N>/diag_counters/rc_resends
/sys/class/infiniband/qibX/ports/<N>/diag_counters/seq_naks
/sys/class/infiniband/qibX/ports/<N>/diag_counters/rdma_seq
/sys/class/infiniband/qibX/ports/<N>/diag_counters/rnr_naks
/sys/class/infiniband/qibX/ports/<N>/diag_counters/other_naks
/sys/class/infiniband/qibX/ports/<N>/diag_counters/rc_timeouts
/sys/class/infiniband/qibX/ports/<N>/diag_counters/look_pkts
/sys/class/infiniband/qibX/ports/<N>/diag_counters/pkt_drops
/sys/class/infiniband/qibX/ports/<N>/diag_counters/dma_wait
/sys/class/infiniband/qibX/ports/<N>/diag_counters/unaligned

Defined on file sysfs-class-infiniband

[to be documented]

sysfs interface for Mellanox Connect-IB HCA driver mlx5

/sys/class/infiniband/qibX/ports/<N>/linkstate/loopback
/sys/class/infiniband/qibX/ports/<N>/linkstate/led_override
/sys/class/infiniband/qibX/ports/<N>/linkstate/hrtbt_enable
/sys/class/infiniband/qibX/ports/<N>/linkstate/status
/sys/class/infiniband/qibX/ports/<N>/linkstate/status_str

Defined on file sysfs-class-infiniband

[to be documented]

loopback: | (WO)
led_override: | (WO)
hrtbt_enable: | (RW)
status: | (RO)
status_str: | (RO) Displays information about the link state, possible cable/switch problems, and hardware errors. Possible states are- “Initted”, “Present”, “IB_link_up”, “IB_configured” or “Fatal_Hardware_Error”.

/sys/class/infiniband/qibX/ports/<N>/sl2vl/[0-15]

Defined on file sysfs-class-infiniband

(RO) The directory contains 16 files numbered 0-15 that specify the Service Level (SL). Listing the SL files returns the Virtual Lane (VL) as programmed by the SL.

/sys/class/infiniband/qibX/version
/sys/class/infiniband/qibX/hw_rev
/sys/class/infiniband/qibX/hca_type
/sys/class/infiniband/qibX/board_id
/sys/class/infiniband/qibX/boardversion
/sys/class/infiniband/qibX/nctxts
/sys/class/infiniband/qibX/localbus_info
/sys/class/infiniband/qibX/tempsense
/sys/class/infiniband/qibX/serial
/sys/class/infiniband/qibX/nfreectxts
/sys/class/infiniband/qibX/chip_reset

Defined on file sysfs-class-infiniband

version: | (RO) Display version information of installed software and drivers.
hw_rev: | (RO) Hardware revision number
hca_type: | (RO) Host channel adapter type
board_id: | (RO) Manufacturing board id
boardversion: | (RO) Current version of the chip architecture
nctxts: | (RO) Return the number of user ports (contexts) available
localbus_info: | (RO) Human readable localbus info
tempsense: | (RO) Display temp sense registers in decimal
serial: | (RO) Serial number of the HCA
nfreectxts: | (RO) The number of free user ports (contexts) available.
chip_reset: | (WO) Reset the chip if possible by writing “reset” to this file. Only allowed if no user contexts are open that use chip resources.

/sys/class/infiniband/usnic_X/board_id
/sys/class/infiniband/usnic_X/config
/sys/class/infiniband/usnic_X/qp_per_vf
/sys/class/infiniband/usnic_X/max_vf
/sys/class/infiniband/usnic_X/cq_per_vf
/sys/class/infiniband/usnic_X/iface

Defined on file sysfs-class-infiniband

board_id: | (RO) Manufacturing board id
config: | (RO) Report the configuration for this PF
qp_per_vf: | (RO) Queue pairs per virtual function.
max_vf: | (RO) Max virtual functions
cq_per_vf: | (RO) Completion queue per virtual function
iface: | (RO) Shows which network interface this usNIC entry is associated to (visible with ifconfig).

/sys/class/infiniband/usnic_X/qpn/summary
/sys/class/infiniband/usnic_X/qpn/context

Defined on file sysfs-class-infiniband

[to be documented]

sysfs interface for Emulex RoCE HCA Driver

/sys/class/infiniband/vmw_pvrdmaX/hw_rev
/sys/class/infiniband/vmw_pvrdmaX/hca_type
/sys/class/infiniband/vmw_pvrdmaX/board_id

Defined on file sysfs-class-infiniband

hw_rev: | (RO) | Hardware revision number
hca_type: | (RO) | Host channel adapter type
board_id: | (RO) | Display PVRDMA manufacturing board ID

sysfs interface for Broadcom NetXtreme-E RoCE driver

/sys/class/infiniband_mad/abi_version

Defined on file sysfs-class-infiniband

(RO) Value is incremented if any changes are made that break userspace ABI compatibility of umad & issm devices.

/sys/class/infiniband_mad/umad<N>/ibdev
/sys/class/infiniband_mad/umad<N>/port
/sys/class/infiniband_mad/issm<N>/ibdev
/sys/class/infiniband_mad/issm<N>/port

Defined on file sysfs-class-infiniband

Each port of each InfiniBand device has a “umad” device and an “issm” device attached. For example, a two-port HCA will have two umad devices and two issm devices, while a switch will have one device of each type (for switch port 0).

ibdev: | (RO) Show Infiniband (IB) device name
port: | (RO) Display port number

/sys/class/infiniband_srp/srp-<hca>-<port_number>/add_target

Defined on file sysfs-driver-ib_srp

Interface for making ib_srp connect to a new target. One can request ib_srp to connect to a new target by writing a comma-separated list of login parameters to this sysfs attribute. The supported parameters are:

- id_ext, a 16-digit hexadecimal number specifying the eight byte identifier extension in the 16-byte SRP target port identifier. The target port identifier is sent by ib_srp to the target in the SRP_LOGIN_REQ request.

- ioc_guid, a 16-digit hexadecimal number specifying the eight byte I/O controller GUID portion of the 16-byte target port identifier.

- dgid, a 32-digit hexadecimal number specifying the destination GID.

- pkey, a four-digit hexadecimal number specifying the InfiniBand partition key.

- service_id, a 16-digit hexadecimal number specifying the InfiniBand service ID used to establish communication with the SRP target. How to find out the value of the service ID is specified in the documentation of the SRP target.

- max_sect, a decimal number specifying the maximum number of 512-byte sectors to be transferred via a single SCSI command.

- max_cmd_per_lun, a decimal number specifying the maximum number of outstanding commands for a single LUN.

- io_class, a hexadecimal number specifying the SRP I/O class. Must be either 0xff00 (rev 10) or 0x0100 (rev 16a). The I/O class defines the format of the SRP initiator and target port identifiers.

- initiator_ext, a 16-digit hexadecimal number specifying the identifier extension portion of the SRP initiator port identifier. This data is sent by the initiator to the target in the SRP_LOGIN_REQ request.

- cmd_sg_entries, a number in the range 1..255 that specifies the maximum number of data buffer descriptors stored in the SRP_CMD information unit itself. With allow_ext_sg=0 the parameter cmd_sg_entries defines the maximum S/G list length for a single SRP_CMD, and commands whose S/G list length exceeds this limit after S/G list collapsing will fail.

- allow_ext_sg, whether ib_srp is allowed to include a partial memory descriptor list in an SRP_CMD instead of the entire list. If a partial memory descriptor list has been included in an SRP_CMD the remaining memory descriptors are communicated from initiator to target via an additional RDMA transfer. Setting allow_ext_sg to 1 increases the maximum amount of data that can be transferred between initiator and target via a single SCSI command. Since not all SRP target implementations support partial memory descriptor lists the default value for this option is 0.

- sg_tablesize, a number in the range 1..2048 specifying the maximum S/G list length the SCSI layer is allowed to pass to ib_srp. Specifying a value that exceeds cmd_sg_entries is only safe with partial memory descriptor list support enabled (allow_ext_sg=1).

- comp_vector, a number in the range 0..n-1 specifying the MSI-X completion vector of the first RDMA channel. Some HCA’s allocate multiple (n) MSI-X vectors per HCA port. If the IRQ affinity masks of these interrupts have been configured such that each MSI-X interrupt is handled by a different CPU then the comp_vector parameter can be used to spread the SRP completion workload over multiple CPU’s.

- tl_retry_count, a number in the range 2..7 specifying the IB RC retry count.

- queue_size, the maximum number of commands that the initiator is allowed to queue per SCSI host. The default value for this parameter is 62. The lowest supported value is 2.

- max_it_iu_size, a decimal number specifying the maximum initiator to target information unit length.

/sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev

Defined on file sysfs-driver-ib_srp

HCA name (<hca>).

/sys/class/infiniband_srp/srp-<hca>-<port_number>/port

Defined on file sysfs-driver-ib_srp

HCA port number (<port_number>).

/sys/class/infiniband_verbs/abi_version

Defined on file sysfs-class-infiniband

(RO) Value is incremented if any changes are made that break userspace ABI compatibility of uverbs devices.

sysfs interface for Mellanox IB HCA low-level driver (mthca)

/sys/class/infiniband_verbs/uverbs<N>/ibdev
/sys/class/infiniband_verbs/uverbs<N>/abi_version

Defined on file sysfs-class-infiniband

ibdev: | (RO) Display Infiniband (IB) device name
abi_version: | (RO) Show ABI version of IB device specific interfaces.

/sys/class/rfkill

Defined on file sysfs-class-rfkill

The rfkill class subsystem folder. Each registered rfkill driver is represented by an rfkillX subfolder (X being an integer >= 0).

/sys/class/rfkill/rfkill[0-9]+/hard

Defined on file sysfs-class-rfkill

Current hardblock state. This file is read only. Values: A numeric value.

> 0: inactive

>   The transmitter is (potentially) active.

> 1: active

>   The transmitter is forced off by something outside of the driver’s control.

/sys/class/rfkill/rfkill[0-9]+/name

Defined on file sysfs-class-rfkill

Name assigned by driver to this key (interface or driver name). Values: arbitrary string.

/sys/class/rfkill/rfkill[0-9]+/persistent

Defined on file sysfs-class-rfkill

Whether the soft blocked state is initialised from non-volatile storage at startup. Values: A numeric value:

> - 0: false

> - 1: true

/sys/class/rfkill/rfkill[0-9]+/soft

Defined on file sysfs-class-rfkill

Current softblock state. This file is read and write. Values: A numeric value.

> 0: inactive

>   The transmitter is (potentially) active.

> 1: active

>   The transmitter is turned off by software.

/sys/class/rfkill/rfkill[0-9]+/state

Defined on file sysfs-class-rfkill

Current state of the transmitter. This file was scheduled to be removed in 2014, but due to its large number of users it will be sticking around for a bit longer. Despite it being marked as stable, the newer “hard” and “soft” interfaces should be preferred, since it is not possible to express the ‘soft and hard block’ state of the rfkill driver through this interface. There will likely be another attempt to remove it in the future. Values: A numeric value.

> 0: RFKILL_STATE_SOFT_BLOCKED

>   transmitter is turned off by software

> 1: RFKILL_STATE_UNBLOCKED

>   transmitter is (potentially) active

> 2: RFKILL_STATE_HARD_BLOCKED

>   transmitter is forced off by something outside of the driver’s control.

/sys/class/rfkill/rfkill[0-9]+/type

Defined on file sysfs-class-rfkill

Driver type string (“wlan”, “bluetooth”, etc). Values: See include/linux/rfkill.h.

/sys/class/scsi_host/host<n>/allow_ext_sg

Defined on file sysfs-driver-ib_srp

Whether ib_srp is allowed to include a partial memory descriptor list in an SRP_CMD when communicating with an SRP target.

/sys/class/scsi_host/host<n>/ch_count

Defined on file sysfs-driver-ib_srp

Number of RDMA channels used for communication with the SRP target.

/sys/class/scsi_host/host<n>/cmd_sg_entries

Defined on file sysfs-driver-ib_srp

Maximum number of data buffer descriptors that may be sent to the target in a single SRP_CMD request.

/sys/class/scsi_host/host<n>/comp_vector

Defined on file sysfs-driver-ib_srp

Completion vector used for the first RDMA channel.

/sys/class/scsi_host/host<n>/dgid

Defined on file sysfs-driver-ib_srp

InfiniBand destination GID used for communication with the SRP target. Differs from orig_dgid if port redirection has happened.

/sys/class/scsi_host/host<n>/id_ext

Defined on file sysfs-driver-ib_srp

Eight-byte identifier extension portion of the 16-byte target port identifier.

/sys/class/scsi_host/host<n>/ioc_guid

Defined on file sysfs-driver-ib_srp

Eight-byte I/O controller GUID portion of the 16-byte target port identifier.

/sys/class/scsi_host/host<n>/local_ib_device

Defined on file sysfs-driver-ib_srp

Name of the InfiniBand HCA used for communicating with the SRP target.

/sys/class/scsi_host/host<n>/local_ib_port

Defined on file sysfs-driver-ib_srp

Number of the HCA port used for communicating with the SRP target.

/sys/class/scsi_host/host<n>/orig_dgid

Defined on file sysfs-driver-ib_srp

InfiniBand destination GID specified in the parameters written to the add_target sysfs attribute.

/sys/class/scsi_host/host<n>/pkey

Defined on file sysfs-driver-ib_srp

A 16-bit number representing the InfiniBand partition key used for communication with the SRP target.

/sys/class/scsi_host/host<n>/req_lim

Defined on file sysfs-driver-ib_srp

Number of requests ib_srp can send to the target before it has to wait for more credits. For more information see also the SRP credit algorithm in the SRP specification.

/sys/class/scsi_host/host<n>/service_id

Defined on file sysfs-driver-ib_srp

InfiniBand service ID used for establishing communication with the SRP target.

/sys/class/scsi_host/host<n>/sgid

Defined on file sysfs-driver-ib_srp

InfiniBand GID of the source port used for communication with the SRP target.

/sys/class/scsi_host/host<n>/zero_req_lim

Defined on file sysfs-driver-ib_srp

Number of times the initiator had to wait before sending a request to the target because it ran out of credits. For more information see also the SRP credit algorithm in the SRP specification.

/sys/class/srp_remote_ports/port-<h>:<n>/delete

Defined on file sysfs-transport-srp

Instructs an SRP initiator to disconnect from a target and to remove all LUNs imported from that target.

/sys/class/srp_remote_ports/port-<h>:<n>/dev_loss_tmo

Defined on file sysfs-transport-srp

Number of seconds the SCSI layer will wait after a transport layer error has been observed before removing a target port. Zero means immediate removal. Setting this attribute to “off” will disable the dev_loss timer.

/sys/class/srp_remote_ports/port-<h>:<n>/fast_io_fail_tmo

Defined on file sysfs-transport-srp

Number of seconds the SCSI layer will wait after a transport layer error has been observed before failing I/O. Zero means failing I/O immediately. Setting this attribute to “off” will disable the fast_io_fail timer.

/sys/class/srp_remote_ports/port-<h>:<n>/port_id

Defined on file sysfs-transport-srp

16-byte local SRP port identifier in hexadecimal format. An example: 4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00.

/sys/class/srp_remote_ports/port-<h>:<n>/reconnect_delay

Defined on file sysfs-transport-srp

Number of seconds the SCSI layer will wait after a reconnect attempt failed before retrying. Setting this attribute to “off” will disable time-based reconnecting.

/sys/class/srp_remote_ports/port-<h>:<n>/roles

Defined on file sysfs-transport-srp

Role of the remote port. Either “SRP Initiator” or “SRP Target”.

/sys/class/srp_remote_ports/port-<h>:<n>/state

Defined on file sysfs-transport-srp

State of the transport layer used for communication with the remote port. “running” if the transport layer is operational; “blocked” if a transport layer error has been encountered but the fast_io_fail_tmo timer has not yet fired; “fail-fast” after the fast_io_fail_tmo timer has fired and before the “dev_loss_tmo” timer has fired; “lost” after the “dev_loss_tmo” timer has fired and before the port is finally removed.

/sys/class/tpm/tpmX/device/

Defined on file sysfs-class-tpm

The device/ directory under a specific TPM instance exposes the properties of that TPM chip

/sys/class/tpm/tpmX/device/active

Defined on file sysfs-class-tpm

The “active” property prints a ‘1’ if the TPM chip is accepting commands. An inactive TPM chip still contains all the state of an active chip (Storage Root Key, NVRAM, etc), and can be visible to the OS, but will only accept a restricted set of commands. See the TPM Main Specification part 2, Structures, section 17 for more information on which commands are available.

/sys/class/tpm/tpmX/device/cancel

Defined on file sysfs-class-tpm

The “cancel” property allows you to cancel the currently pending TPM command. Writing any value to cancel will call the TPM vendor specific cancel operation.

/sys/class/tpm/tpmX/device/caps

Defined on file sysfs-class-tpm

The “caps” property contains TPM manufacturer and version info.

Example output:

    Manufacturer: 0x53544d20
    TCG version: 1.2
    Firmware version: 8.16

Manufacturer is a hex dump of the 4 byte manufacturer info space in a TPM. TCG version shows the TCG TPM spec level that the chip supports. Firmware version is that of the chip and is manufacturer specific.

/sys/class/tpm/tpmX/device/durations

Defined on file sysfs-class-tpm

The “durations” property shows the 3 vendor-specific values used to wait for a short, medium and long TPM command. All TPM commands are categorized as short, medium or long in execution time, so that the driver doesn’t have to wait any longer than necessary before starting to poll for a result.

Example output:

    3015000 4508000 180995000 [original]

Here the short, medium and long durations are displayed in usecs. “[original]” indicates that the values are displayed unmodified from when they were queried from the chip. Durations can be modified in the case where a buggy chip reports them in msec instead of usec and they need to be scaled to be displayed in usecs. In this case “[adjusted]” will be displayed in place of “[original]”.

/sys/class/tpm/tpmX/device/enabled

Defined on file sysfs-class-tpm

The “enabled” property prints a ‘1’ if the TPM chip is enabled, meaning that it should be visible to the OS. This property may be visible but produce a ‘0’ after some operation that disables the TPM.

/sys/class/tpm/tpmX/device/owned

Defined on file sysfs-class-tpm

The “owned” property produces a ‘1’ if the TPM_TakeOwnership ordinal has been executed successfully in the chip. A ‘0’ indicates that ownership hasn’t been taken.

/sys/class/tpm/tpmX/device/pcrs

Defined on file sysfs-class-tpm

The “pcrs” property will dump the current value of all Platform Configuration Registers in the TPM. Note that since these values may be constantly changing, the output is only valid for a snapshot in time.

Example output:

    PCR-00: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
    PCR-01: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
    PCR-02: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
    PCR-03: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
    PCR-04: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
    ...

The number of PCRs and hex bytes needed to represent a PCR value will vary depending on TPM chip version. For TPM 1.1 and 1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes long. Use the “caps” property to determine TPM version.

/sys/class/tpm/tpmX/device/pubek

Defined on file sysfs-class-tpm

The “pubek” property will return the TPM’s public endorsement key if possible. If the TPM has had ownership established and is version 1.2, the pubek will not be available without the owner’s authorization. Since the TPM driver doesn’t store any secrets, it can’t authorize its own request for the pubek, making it unaccessible. The public endorsement key is gener- ated at TPM manufacture time and exists for the life of the chip.

Example output:

    Algorithm: 00 00 00 01
    Encscheme: 00 03
    Sigscheme: 00 01
    Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
    Modulus length: 256
    Modulus:
    B4 76 41 82 C9 20 2C 10 18 40 BC 8B E5 44 4C 6C
    3A B2 92 0C A4 9B 2A 83 EB 5C 12 85 04 48 A0 B6
    1E E4 81 84 CE B2 F2 45 1C F0 85 99 61 02 4D EB
    86 C4 F7 F3 29 60 52 93 6B B2 E5 AB 8B A9 09 E3
    D7 0E 7D CA 41 BF 43 07 65 86 3C 8C 13 7A D0 8B
    82 5E 96 0B F8 1F 5F 34 06 DA A2 52 C1 A9 D5 26
    0F F4 04 4B D9 3F 2D F2 AC 2F 74 64 1F 8B CD 3E
    1E 30 38 6C 70 63 69 AB E2 50 DF 49 05 2E E1 8D
    6F 78 44 DA 57 43 69 EE 76 6C 38 8A E9 8E A3 F0
    A7 1F 3C A8 D0 12 15 3E CA 0E BD FA 24 CD 33 C6
    47 AE A4 18 83 8E 22 39 75 93 86 E6 FD 66 48 B6
    10 AD 94 14 65 F9 6A 17 78 BD 16 53 84 30 BF 70
    E0 DC 65 FD 3C C6 B0 1E BF B9 C1 B5 6C EF B1 3A
    F8 28 05 83 62 26 11 DC B4 6B 5A 97 FF 32 26 B6
    F7 02 71 CF 15 AE 16 DD D1 C1 8E A8 CF 9B 50 7B
    C3 91 FF 44 1E CF 7C 39 FE 17 77 21 20 BD CE 9B

Possible values:

    Algorithm:    TPM_ALG_RSA                     (1)
    Encscheme:    TPM_ES_RSAESPKCSv15             (2)
                  TPM_ES_RSAESOAEP_SHA1_MGF1      (3)
    Sigscheme:    TPM_SS_NONE                     (1)
    Parameters, a byte string of 3 u32 values:
          Key Length (bits):      00 00 08 00     (2048)
          Num primes:             00 00 00 02     (2)
          Exponent Size:          00 00 00 00     (0 means the
                                                   default exp)
    Modulus Length: 256 (bytes)
    Modulus:      The 256 byte Endorsement Key modulus

/sys/class/tpm/tpmX/device/temp_deactivated

Defined on file sysfs-class-tpm

The “temp_deactivated” property returns a ‘1’ if the chip has been temporarily deactivated, usually until the next power cycle. Whether a warm boot (reboot) will clear a TPM chip from a temp_deactivated state is platform specific.

/sys/class/tpm/tpmX/device/timeouts

Defined on file sysfs-class-tpm

The “timeouts” property shows the 4 vendor-specific values for the TPM’s interface spec timeouts. The use of these timeouts is defined by the TPM interface spec that the chip conforms to.

Example output:

    750000 750000 750000 750000 [original]

The four timeout values are shown in usecs, with a trailing “[original]” or “[adjusted]” depending on whether the values were scaled by the driver to be reported in usec from msecs.

/sys/class/tpm/tpmX/pcr-<H>/<N>

Defined on file sysfs-class-tpm

produces output in compact hex representation for PCR number N from hash bank H. N is the numeric value of the PCR number and H is the crypto string representation of the hash

Example output:

    cat /sys/class/tpm/tpm0/pcr-sha256/7
    2ED93F199692DC6788EFA6A1FE74514AB9760B2A6CEEAEF6C808C13E4ABB0D42

/sys/class/tpm/tpmX/tpm_version_major

Defined on file sysfs-class-tpm

The “tpm_version_major” property shows the TCG spec major version implemented by the TPM device.

Example output:

    2

/sys/class/ubi/

Defined on file sysfs-class-ubi

The ubi/ class sub-directory belongs to the UBI subsystem and provides general UBI information, per-UBI device information and per-UBI volume information.

/sys/class/ubi/ubiX/avail_eraseblocks

Defined on file sysfs-class-ubi

Amount of available logical eraseblock. For example, one may create a new UBI volume which has this amount of logical eraseblocks.

/sys/class/ubi/ubiX/bad_peb_count

Defined on file sysfs-class-ubi

Count of bad physical eraseblocks on the underlying MTD device.

/sys/class/ubi/ubiX/bgt_enabled

Defined on file sysfs-class-ubi

Contains ASCII “0n” if the UBI background thread is disabled, and ASCII “1n” if it is enabled.

/sys/class/ubi/ubiX/dev

Defined on file sysfs-class-ubi

Major and minor numbers of the character device corresponding to this UBI device (in <major>:<minor> format).

/sys/class/ubi/ubiX/eraseblock_size

Defined on file sysfs-class-ubi

Maximum logical eraseblock size this UBI device may provide. UBI volumes may have smaller logical eraseblock size because of their alignment.

/sys/class/ubi/ubiX/max_ec

Defined on file sysfs-class-ubi

Maximum physical eraseblock erase counter value.

/sys/class/ubi/ubiX/max_vol_count

Defined on file sysfs-class-ubi

Maximum number of volumes which this UBI device may have.

/sys/class/ubi/ubiX/min_io_size

Defined on file sysfs-class-ubi

Minimum input/output unit size. All the I/O may only be done in fractions of the contained number.

/sys/class/ubi/ubiX/mtd_num

Defined on file sysfs-class-ubi

Number of the underlying MTD device.

/sys/class/ubi/ubiX/reserved_for_bad

Defined on file sysfs-class-ubi

Number of physical eraseblocks reserved for bad block handling.

/sys/class/ubi/ubiX/ro_mode

Defined on file sysfs-class-ubi

Contains ASCII “1n” if the read-only flag is set on this device, and “0n” if it is cleared. UBI devices mark themselves as read-only when they detect an unrecoverable error.

/sys/class/ubi/ubiX/total_eraseblocks

Defined on file sysfs-class-ubi

Total number of good (not marked as bad) physical eraseblocks on the underlying MTD device.

/sys/class/ubi/ubiX/ubiX_Y/

Defined on file sysfs-class-ubi

The /sys/class/ubi/ubiX/ubiX_0/, /sys/class/ubi/ubiX/ubiX_1/, etc directories describe UBI volumes on UBI device X (volumes 0, 1, etc).

/sys/class/ubi/ubiX/ubiX_Y/alignment

Defined on file sysfs-class-ubi

Volume alignment - the value the logical eraseblock size of this volume has to be aligned on. For example, 2048 means that logical eraseblock size is multiple of 2048. In other words, volume logical eraseblock size is UBI device logical eraseblock size aligned to the alignment value.

/sys/class/ubi/ubiX/ubiX_Y/corrupted

Defined on file sysfs-class-ubi

Contains ASCII “0n” if the UBI volume is OK, and ASCII “1n” if it is corrupted (e.g., due to an interrupted volume update).

/sys/class/ubi/ubiX/ubiX_Y/data_bytes

Defined on file sysfs-class-ubi

The amount of data this volume contains. This value makes sense only for static volumes, and for dynamic volume it equivalent to the total volume size in bytes.

/sys/class/ubi/ubiX/ubiX_Y/dev

Defined on file sysfs-class-ubi

Major and minor numbers of the character device corresponding to this UBI volume (in <major>:<minor> format).

/sys/class/ubi/ubiX/ubiX_Y/name

Defined on file sysfs-class-ubi

Volume name.

/sys/class/ubi/ubiX/ubiX_Y/reserved_ebs

Defined on file sysfs-class-ubi

Count of physical eraseblock reserved for this volume. Equivalent to the volume size in logical eraseblocks.

/sys/class/ubi/ubiX/ubiX_Y/type

Defined on file sysfs-class-ubi

Volume type. Contains ASCII “dynamicn” for dynamic volumes and “staticn” for static volumes.

/sys/class/ubi/ubiX/ubiX_Y/upd_marker

Defined on file sysfs-class-ubi

Contains ASCII “0n” if the update marker is not set for this volume, and “1n” if it is set. The update marker is set when volume update starts, and cleaned when it ends. So the presence of the update marker indicates that the volume is being updated at the moment of the update was interrupted. The later may be checked using the “corrupted” sysfs file.

/sys/class/ubi/ubiX/ubiX_Y/usable_eb_size

Defined on file sysfs-class-ubi

Logical eraseblock size of this volume. Equivalent to logical eraseblock size of the device aligned on the volume alignment value.

/sys/class/ubi/ubiX/volumes_count

Defined on file sysfs-class-ubi

Count of volumes on this UBI device.

/sys/class/ubi/version

Defined on file sysfs-class-ubi

This file contains version of the latest supported UBI on-media format. Currently it is 1, and there is no plan to change this. However, if in the future UBI needs on-flash format changes which cannot be done in a compatible manner, a new format version will be added. So this is a mechanism for possible future backward-compatible (but forward-incompatible) improvements.

/sys/class/ubiX/

Defined on file sysfs-class-ubi

The /sys/class/ubi0, /sys/class/ubi1, etc directories describe UBI devices (UBI device 0, 1, etc). They contain general UBI device information and per UBI volume information (each UBI device may have many UBI volumes)

/sys/class/udc/<udc>/a_alt_hnp_support

Defined on file sysfs-class-udc

Indicates if an OTG A-Host supports HNP at an alternate port.

/sys/class/udc/<udc>/a_hnp_support

Defined on file sysfs-class-udc

Indicates if an OTG A-Host supports HNP at this port.

/sys/class/udc/<udc>/b_hnp_enable

Defined on file sysfs-class-udc

Indicates if an OTG A-Host enabled HNP support.

/sys/class/udc/<udc>/current_speed

Defined on file sysfs-class-udc

Indicates the current negotiated speed at this port.

/sys/class/udc/<udc>/function

Defined on file sysfs-class-udc

Prints out name of currently running USB Gadget Driver.

/sys/class/udc/<udc>/is_a_peripheral

Defined on file sysfs-class-udc

Indicates that this port is the default Host on an OTG session but HNP was used to switch roles.

/sys/class/udc/<udc>/is_otg

Defined on file sysfs-class-udc

Indicates that this port support OTG.

/sys/class/udc/<udc>/maximum_speed

Defined on file sysfs-class-udc

Indicates the maximum USB speed supported by this port.

/sys/class/udc/<udc>/soft_connect

Defined on file sysfs-class-udc

Allows users to disconnect data pullup resistors thus causing a logical disconnection from the USB Host.

/sys/class/udc/<udc>/srp

Defined on file sysfs-class-udc

Allows users to manually start Session Request Protocol.

/sys/class/udc/<udc>/state

Defined on file sysfs-class-udc

Indicates current state of the USB Device Controller. Valid states are: ‘not-attached’, ‘attached’, ‘powered’, ‘reconnecting’, ‘unauthenticated’, ‘default’, ‘addressed’, ‘configured’, and ‘suspended’; however not all USB Device Controllers support reporting all states.

## Symbols under /sys/devices

/sys/devices/*/dev

Defined on file sysfs-devices

Major and minor numbers of the character device corresponding to the device (in <major>:<minor> format).

/sys/devices/*/devspec

Defined on file sysfs-devices

If CONFIG_OF is enabled, then this file is present. When read, it returns full name of the device node.

/sys/devices/*/obppath

Defined on file sysfs-devices

If CONFIG_OF is enabled, then this file is present. When read, it returns full name of the device node.

/sys/devices/*/of_node

Defined on file sysfs-devices

Any device associated with a device-tree node will have an of_path symlink pointing to the corresponding device node in /sys/firmware/devicetree/

/sys/devices/pciXXXX:XX/0000:XX:XX.X/0000:XX:XX.X/keep_cfg

Defined on file sysfs-driver-misc-cp500

Flag which signals if FPGA shall keep or reload configuration bitstream on reset. Normal FPGA behavior and default is to keep configuration bitstream and to only reset the configured logic.

Reloading configuration on reset enables an update of the configuration bitstream with a simple reboot. Otherwise it is necessary to power cycle the device to reload the new configuration bitstream.

This file is read/write. The values are as follows: 1 = keep configuration bitstream on reset, default 0 = reload configuration bitstream on reset

Users: KEBA

/sys/devices/pciXXXX:XX/0000:XX:XX.X/0000:XX:XX.X/version

Defined on file sysfs-driver-misc-cp500

Version of the FPGA configuration bitstream as printable string. This file is read only.

Users: KEBA

/sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/cap

Defined on file sysfs-driver-dma-ioatdma

Capabilities the DMA supports.Currently there are DMA_PQ, DMA_PQ_VAL, DMA_XOR,DMA_XOR_VAL,DMA_INTERRUPT.

/sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/intr_coalesce

Defined on file sysfs-driver-dma-ioatdma

Tune-able interrupt delay value per channel basis.

/sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_active

Defined on file sysfs-driver-dma-ioatdma

The number of descriptors active in the ring.

/sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_size

Defined on file sysfs-driver-dma-ioatdma

Descriptor ring size, total number of descriptors available.

/sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/version

Defined on file sysfs-driver-dma-ioatdma

Version of ioatdma device.

/sys/devices/platform/firmware\:zynqmp-firmware/feature_config_id

Defined on file sysfs-driver-firmware-zynqmp

This sysfs interface allows user to configure features at runtime. The user can enable or disable features running at firmware as well as the user can configure the parameters of the features at runtime. The supported features are over temperature and external watchdog. Here, the external watchdog is completely different than the /dev/watchdog as the external watchdog is running on the firmware and it is used to monitor the health of firmware not APU(Linux). Also, the external watchdog is interfaced outside of the zynqmp soc.

The supported config ids are for the feature configuration is, 1. PM_FEATURE_OVERTEMP_STATUS = 1, the user can enable or disable the over temperature feature. 2. PM_FEATURE_OVERTEMP_VALUE = 2, the user can configure the over temperature limit in Degree Celsius. 3. PM_FEATURE_EXTWDT_STATUS = 3, the user can enable or disable the external watchdog feature. 4. PM_FEATURE_EXTWDT_VALUE = 4, the user can configure the external watchdog feature.

Usage:

Select over temperature config ID to enable/disable feature # echo 1 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id

Check over temperature config ID is selected or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id The expected result is 1.

Select over temperature config ID to configure OT limit # echo 2 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id

Check over temperature config ID is selected or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id The expected result is 2.

Select external watchdog config ID to enable/disable feature # echo 3 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id

Check external watchdog config ID is selected or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id The expected result is 3.

Select external watchdog config ID to configure time interval # echo 4 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id

Check external watchdog config ID is selected or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id The expected result is 4.

Users: Xilinx

/sys/devices/platform/firmware\:zynqmp-firmware/feature_config_value

Defined on file sysfs-driver-firmware-zynqmp

This sysfs interface allows to configure features at runtime. The user can enable or disable features running at firmware. Also, the user can configure the parameters of the features at runtime. The supported features are over temperature and external watchdog. Here, the external watchdog is completely different than the /dev/watchdog as the external watchdog is running on the firmware and it is used to monitor the health of firmware not APU(Linux). Also, the external watchdog is interfaced outside of the zynqmp soc.

By default the features are disabled in the firmware. The user can enable features by querying appropriate config id of the features.

The default limit for the over temperature is 90 Degree Celsius. The default timer interval for the external watchdog is 570ms.

The supported config ids are for the feature configuration is, 1. PM_FEATURE_OVERTEMP_STATUS = 1, the user can enable or disable the over temperature feature. 2. PM_FEATURE_OVERTEMP_VALUE = 2, the user can configure the over temperature limit in Degree Celsius. 3. PM_FEATURE_EXTWDT_STATUS = 3, the user can enable or disable the external watchdog feature. 4. PM_FEATURE_EXTWDT_VALUE = 4, the user can configure the external watchdog feature.

Usage:

Enable over temperature feature # echo 1 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 1 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the over temperature feature is enabled or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 1.

Disable over temperature feature # echo 1 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 0 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the over temperature feature is disabled or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 0.

Configure over temperature limit to 50 Degree Celsius # echo 2 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 50 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the over temperature limit is configured or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 50.

Enable external watchdog feature # echo 3 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 1 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the external watchdog feature is enabled or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 1.

Disable external watchdog feature # echo 3 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 0 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the external watchdog feature is disabled or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 0.

Configure external watchdog timer interval to 500ms # echo 4 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_id # echo 500 > /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value

Check whether the external watchdog timer interval is configured or not # cat /sys/devices/platform/firmware:zynqmp-firmware/feature_config_value The expected result is 500.

Users: Xilinx

/sys/devices/platform/firmware\:zynqmp-firmware/ggs*

Defined on file sysfs-driver-firmware-zynqmp

Read/Write PMU global general storage register value, GLOBAL_GEN_STORAGE{0:3}. Global general storage register that can be used by system to pass information between masters.

The register is reset during system or power-on resets. Three registers are used by the FSBL and other Xilinx software products: GLOBAL_GEN_STORAGE{4:6}.

Usage:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/ggs0
    # echo <value> > /sys/devices/platform/firmware\:zynqmp-firmware/ggs0

Example:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/ggs0
    # echo 0x1234ABCD > /sys/devices/platform/firmware\:zynqmp-firmware/ggs0

Users: Xilinx

/sys/devices/platform/firmware\:zynqmp-firmware/health_status

Defined on file sysfs-driver-firmware-zynqmp

This sysfs interface allows to set the health status. If PMUFW is compiled with CHECK_HEALTHY_BOOT, it will check the healthy bit on FPD WDT expiration. If healthy bit is set by a user application running in Linux, PMUFW will do APU only restart. If healthy bit is not set during FPD WDT expiration, PMUFW will do system restart.

Usage:

Set healthy bit:

    # echo 1 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status

Unset healthy bit:

    # echo 0 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status

Users: Xilinx

/sys/devices/platform/firmware\:zynqmp-firmware/pggs*

Defined on file sysfs-driver-firmware-zynqmp

Read/Write PMU persistent global general storage register value, PERS_GLOB_GEN_STORAGE{0:3}. Persistent global general storage register that can be used by system to pass information between masters.

This register is only reset by the power-on reset and maintains its value through a system reset. Four registers are used by the FSBL and other Xilinx software products: PERS_GLOB_GEN_STORAGE{4:7}. Register is reset only by a POR reset.

Usage:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/pggs0
    # echo <value> > /sys/devices/platform/firmware\:zynqmp-firmware/pggs0

Example:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/pggs0
    # echo 0x1234ABCD > /sys/devices/platform/firmware\:zynqmp-firmware/pggs0

Users: Xilinx

/sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope

Defined on file sysfs-driver-firmware-zynqmp

This sysfs interface allows to set the shutdown scope for the next shutdown request. When the next shutdown is performed, the platform specific portion of PSCI-system_off can use the chosen shutdown scope.

Following are available shutdown scopes(subtypes):

subsystem:

  Only the APU along with all of its peripherals not used by other processing units will be shut down. This may result in the FPD power domain being shut down provided that no other processing unit uses FPD peripherals or DRAM.

ps_only:

  The complete PS will be shut down, including the RPU, PMU, etc. Only the PL domain (FPGA) remains untouched.

system:

  The complete system/device is shut down.

Usage:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
    # echo <scope> > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope

Example:

    # cat /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope
    # echo "subsystem" > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope

Users: Xilinx

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/agb_spi_burn_en
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga_spi_burn_en

Defined on file sysfs-driver-mlxreg-io

These files allow gearboxes and FPGA SPI flash burning. The attributes are set 1 to enable burning, 0 - to disable. If the system is in locked-down mode writing these files will not be allowed. The purpose of these files to allow line card Gearboxes and FPGA burning during production flow.

The file is read/write.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_pn
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_version
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_version_min

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD major and minor versions and part number has been burned CPLD device on line card.

The files are read only.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld_upgrade_en
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga_upgrade_en

Defined on file sysfs-driver-mlxreg-io

These files allow CPLD and FPGA burning. Value 1 in file means burning is enabled, 0 - otherwise. If the system is in locked-down mode writing these files will not be allowed. The purpose of these files to allow line card CPLD and FPGA upgrade through the JTAG daisy-chain.

The files are read/write.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_pn
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_version
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_version_min

Defined on file sysfs-driver-mlxreg-io

These files show with which FPGA major and minor versions and part number has been burned FPGA device on line card.

The files are read only.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/max_power
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/config

Defined on file sysfs-driver-mlxreg-io

These files provide the maximum powered required for line card feeding and line card configuration Id.

The files are read only.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/qsfp_pwr_en
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/pwr_en

Defined on file sysfs-driver-mlxreg-io

These files allow to power on/off all QSFP ports and whole line card. The attributes are set 1 for power on, 0 - for power off.

The files are read/write.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_aux_pwr_or_ref
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_dc_dc_pwr_fail
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_fpga_not_done
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_from_chassis
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_line_card
/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_pwr_off_from_chassis

Defined on file sysfs-driver-mlxreg-io

These files show the line reset cause, as following: power auxiliary outage or power refresh, DC-to-DC power failure, FPGA reset failed, line card reset failed, power off from chassis. Value 1 in file means this is reset cause, 0 - otherwise. Only one of the above causes could be 1 at the same time, representing only last reset cause.

The files are read only.

/sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/vpd_wp

Defined on file sysfs-driver-mlxreg-io

This file allow to overwrite line card VPD hardware write protection mode. When attribute is set 1 - write protection is disabled, when 0 - enabled. Default is 0. If the system is in locked-down mode writing this file will not be allowed. The purpose if this file is to allow line card VPD burning during production flow.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic2_health

Defined on file sysfs-driver-mlxreg-io

This file shows 2-nd ASIC health status. The possible values are: 0 - health failed, 2 - health OK, 3 - ASIC in booting state.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_health

Defined on file sysfs-driver-mlxreg-io

This file shows ASIC health status. The possible values are: 0 - health failed, 2 - health OK, 3 - ASIC in booting state.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_pg_fail

Defined on file sysfs-driver-mlxreg-io

This file shows ASIC Power Good status. Value 1 in file means ASIC Power Good failed, 0 - otherwise.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_reset
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic2_reset

Defined on file sysfs-driver-mlxreg-io

These files allow to each of ASICs by writing 1.

The files are write only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_active_image
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_auth_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_upgrade_fail

Defined on file sysfs-driver-mlxreg-io

The files represent BIOS statuses:

bios_active_image: location of current active BIOS image: 0: Top, 1: Bottom. The reported value should correspond to value expected by OS in case of BIOS safe mode is 0. This bit is related to Intel top-swap feature of DualBios on the same flash.

bios_auth_fail: BIOS upgrade is failed because provided BIOS image is not signed correctly.

bios_upgrade_fail: BIOS upgrade is failed by some other reason not because authentication. For example due to physical SPI flash problem.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd1_boot_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd2_boot_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd_fail

Defined on file sysfs-driver-mlxreg-io

These files are related to clock boards status in system. - clk_brd1_boot_fail: warning about 1-st clock board failed to boot from CI. - clk_brd2_boot_fail: warning about 2-nd clock board failed to boot from CI. - clk_brd_fail: error about common clock board boot failure.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd_prog_en

Defined on file sysfs-driver-mlxreg-io

This file enables programming of clock boards. Default is 0 (programming disabled). If the system is in locked-down mode writing this file will not be allowed.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/comm_chnl_ready

Defined on file sysfs-driver-mlxreg-io

This file is used to indicate remote end (for example BMC) that system host CPU is ready for sending telemetry data to remote end. For indication the file should be written 1.

The file is write only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config1
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config2

Defined on file sysfs-driver-mlxreg-io

These files show system static topology identification like system’s static I2C topology, number and type of FPGA devices within the system and so on.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config3

Defined on file sysfs-driver-mlxreg-io

The file indicates COME module hardware configuration. The value is pushed by hardware through GPIO pins. The purpose is to expose some minor BOM changes for the same system SKU.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_pn
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_pn
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_pn
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_pn
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_version_min
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_version_min
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_version_min
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_version_min

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD part numbers and minor versions have been burned CPLD devices equipped on a system.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_version
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_version

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD versions have been burned on carrier and switch boards.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_version

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD versions have been burned on LED or Gearbox board.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_version

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD versions have been burned on LED board.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_pn
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_version
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_version_min

Defined on file sysfs-driver-mlxreg-io

These files show with which CPLD part numbers, version and minor versions have been burned the 5-th CPLD device equipped on a system.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_ap_reset
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_ap_reset

Defined on file sysfs-driver-mlxreg-io

These files aim to monitor the status of the External Root of Trust (EROT) processor’s RESET output to the Application Processor (AP). By reading this file, could be determined if the EROT has invalidated or revoked AP Firmware, at which point it will hold the AP in RESET until a valid firmware is loaded. This protects the AP from running an unauthorized firmware. In the normal flow, the AP reset should be released after the EROT validates the integrity of the FW, and it should be done so as quickly as possible so that the AP boots before the CPU starts to communicate to each ASIC.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_recovery
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_recovery
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_reset
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_reset

Defined on file sysfs-driver-mlxreg-io

These files aim to perform External Root of Trust (EROT) recovery sequence after EROT device failure. These EROT devices protect ASICs from unauthorized access and in normal flow their reset should be released with system power – earliest power up stage, so that EROTs can begin boot and authentication process before CPU starts to communicate to ASICs. Issuing a reset to the EROT while asserting the recovery signal will cause the EROT Application Processor to enter recovery mode so that the EROT FW can be updated/recovered. For reset/recovery the related file should be toggled by 1/0.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_wp
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_wp

Defined on file sysfs-driver-mlxreg-io

These files allow access to External Root of Trust (EROT) for reset and recovery sequence after EROT device failure. Default is 0 (programming disabled). If the system is in locked-down mode writing this file will not be allowed.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/fan_dir

Defined on file sysfs-driver-mlxreg-io

This file shows the system fans direction: forward direction - relevant bit is set 0; reversed direction - relevant bit is set 1.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/jtag_cap

Defined on file sysfs-driver-mlxreg-io

This file indicates the available method of CPLD/FPGA devices field update through the JTAG chain:

b00 - field update through LPC bus register memory space. b01 - Reserved. b10 - Reserved. b11 - field update through CPU GPIOs bit-banging.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/jtag_enable

Defined on file sysfs-driver-mlxreg-io

These files enable and disable the access to the JTAG domain. By default access to the JTAG domain is disabled.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_enable
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_enable

Defined on file sysfs-driver-mlxreg-io

These files allow line cards enable state control. Expected behavior: When lc{n}_enable is written 1, related line card is released from the reset state, when 0 - is hold in reset state.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_pwr
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_pwr

Defined on file sysfs-driver-mlxreg-io

These files switching line cards power on and off. Expected behavior: When lc{n}_pwr is written 1, related line card is powered on, when written 0 - powered off.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_rst_mask
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_rst_mask

Defined on file sysfs-driver-mlxreg-io

These files clear line card reset bit enforced by ASIC, when it sets it due to some abnormal ASIC behavior. Expected behavior: When lc{n}_rst_mask is written 1, related line card reset bit is cleared, when written 0 - no effect.

The files are write only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lid_open

Defined on file sysfs-driver-mlxreg-io

1 - indicates that system lid is opened, otherwise 0.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/mac_reset

Defined on file sysfs-driver-mlxreg-io

This file allows to reset ASIC MT52132 when attribute is set 0 due to some abnormal ASIC behavior. Expected behavior: When mac_reset is written 1, the ASIC MT52132 is released from the reset state, when 0 - is hold in reset state.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/os_started

Defined on file sysfs-driver-mlxreg-io

This file, when written 1, indicates to programmable devices that OS is taking control over it.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pcie_asic_reset_dis

Defined on file sysfs-driver-mlxreg-io

This file allows to retain ASIC up during PCIe root complex reset, when attribute is set 1.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/phy_reset

Defined on file sysfs-driver-mlxreg-io

This file allows to reset PHY 88E1548 when attribute is set 0 due to some abnormal PHY behavior. Expected behavior: When phy_reset is written 1, all PHY 88E1548 are released from the reset state, when 0 - are hold in reset state.

The files are read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pm_mgmt_en

Defined on file sysfs-driver-mlxreg-io

This file assigns power management control ownership. When power management control is provided by hardware, hardware will automatically power off one or more line previously powered line cards in case system power budget is getting insufficient. It could be in case when some of power units lost power good state. When pm_mgmt_en is written 1, power management control by software is enabled, 0 - power management control by hardware. Note that for any setting of pm_mgmt_en attribute hardware will not allow to power on any new line card in case system power budget is insufficient. Same in case software will try to power on several line cards at once - hardware will power line cards while system has enough power budget. Default is 0.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu1_on

Defined on file sysfs-driver-mlxreg-io

These files allow asserting system power cycling, switching power supply units on and off and system’s main power domain shutdown. Expected behavior: When pwr_cycle is written 1: auxiliary power domain will go down and after short period (about 1 second) up. When psu1_on or psu2_on is written 1, related unit will be disconnected from the power source, when written 0 - connected. If both are written 1 - power supplies main power domain will go down. When pwr_down is written 1, system’s main power domain will go down.

The files are write only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu3_on
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu4_on

Defined on file sysfs-driver-mlxreg-io

These files switching power supply units on and off. Expected behavior: When psu3_on or psu4_on is written 1, related unit will be disconnected from the power source, when written 0 - connected.

The files are write only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pwr_converter_prog_en

Defined on file sysfs-driver-mlxreg-io

This file enables programming of power converters. Default is 0 (programming disabled). If the system is in locked-down mode writing this file will not be allowed.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/qsfp_pwr_good

Defined on file sysfs-driver-mlxreg-io

This file shows QSFP ports power status. The value is set to 0 when one of any QSFP ports is plugged. The value is set to 1 when there are no any QSFP ports are plugged. The possible values are: 0 - Power good, 1 - Not power good.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_ac_ok_fail

Defined on file sysfs-driver-mlxreg-io

This file shows the system reset cause due to AC power failure. Value 1 in file means this is reset cause, 0 - otherwise.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_ac_pwr_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_platform
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_soc
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sw_pwr_off

Defined on file sysfs-driver-mlxreg-io

These files show the system reset causes, as following: reset due to AC power failure, reset invoked from software by assertion reset signal through CPLD. reset caused by signal asserted by SOC through ACPI register, reset invoked from software by assertion power off signal through CPLD.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_aux_pwr_or_ref
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_asic_thermal
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_hotswap_or_halt
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_hotswap_or_wd
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_fw_reset
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_long_pb
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_main_pwr_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_short_pb
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sw_reset

Defined on file sysfs-driver-mlxreg-io

These files show the system reset cause, as following: power auxiliary outage or power refresh, ASIC thermal shutdown, halt, hotswap, watchdog, firmware reset, long press power button, short press power button, software reset. Value 1 in file means this is reset cause, 0 - otherwise. Only one of the above causes could be 1 at the same time, representing only last reset cause.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_pwr_fail
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_from_comex
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_system
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_voltmon_upgrade_fail

Defined on file sysfs-driver-mlxreg-io

These files show the system reset cause, as following: ComEx power fail, reset from ComEx, system platform reset, reset due to voltage monitor devices upgrade failure, Value 1 in file means this is reset cause, 0 - otherwise. Only one bit could be 1 at the same time, representing only the last reset cause.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_thermal
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_wd
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_from_asic
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_reload_bios
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sff_wd
/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_swb_wd

Defined on file sysfs-driver-mlxreg-io

These files show the system reset cause, as following: COMEX thermal shutdown; wathchdog power off or reset was derived by one of the next components: COMEX, switch board or by Small Form Factor mezzanine, reset requested from ASIC, reset caused by BIOS reload. Value 1 in file means this is reset cause, 0 - otherwise. Only one of the above causes could be 1 at the same time, representing only last reset cause.

The files are read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_long_pwr_pb

Defined on file sysfs-driver-mlxreg-io

This file if set 1 indicates that system has been reset by long press of power button.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_pwr_converter_fail

Defined on file sysfs-driver-mlxreg-io

This file shows the system reset cause due to power converter devices failure. Value 1 in file means this is reset cause, 0 - otherwise.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_swb_dc_dc_pwr_fail

Defined on file sysfs-driver-mlxreg-io

This file shows 1 in case the system reset happened due to the failure of any DC-DC power converter devices equipped on the switch board.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/select_iio

Defined on file sysfs-driver-mlxreg-io

This file allows iio devices selection.

Attribute select_iio can be written with 0 or with 1. It selects which one of iio devices can be accessed.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/shutdown_unlock

Defined on file sysfs-driver-mlxreg-io

This file allows to unlock ASIC after thermal shutdown event. When system thermal shutdown is enforced by ASIC, ASIC is getting locked and after system boot it will not be available. Software can decide to unlock it by setting this attribute to 1 and then perform system power cycle by setting pwr_cycle attribute to 1 (power cycle of main power domain). Before setting shutdown_unlock to 1 it is recommended to validate that system reboot cause is reset_asic_thermal or reset_thermal_spc_or_pciesw. In case shutdown_unlock is not set 1, the only way to release ASIC from locking - is full system power cycle through the external power distribution unit. Default is 1.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/spi_chnl_select

Defined on file sysfs-driver-mlxreg-io

This file allows SPI chip selection for External Root of Trust (EROT) device Out-of-Band recovery. File can be written with 0 or with 1. It selects which EROT can be accessed through SPI device.

The file is read/write.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/ufm_version

Defined on file sysfs-driver-mlxreg-io

This file exposes the firmware version of burnable voltage regulator devices.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/voltreg_update_status

Defined on file sysfs-driver-mlxreg-io

This file exposes the configuration update status of burnable voltage regulator devices. The status values are as following: 0 - OK; 1 - CRC failure; 2 = I2C failure; 3 - in progress.

The file is read only.

/sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/vpd_wp

Defined on file sysfs-driver-mlxreg-io

This file allows to overwrite system VPD hardware write protection when attribute is set 1.

The file is read/write.

/sys/devices/system/cpu/cpuX/topology/book_id

Defined on file sysfs-devices-system-cpu

the book ID of cpuX. Typically it is the hardware platform’s identifier (rather than the kernel’s). The actual value is architecture and platform dependent. it’s only used on s390. Values: integer

/sys/devices/system/cpu/cpuX/topology/book_siblings

Defined on file sysfs-devices-system-cpu

internal kernel map of cpuX’s hardware threads within the same book_id. it’s only used on s390. Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/book_siblings_list

Defined on file sysfs-devices-system-cpu

human-readable list of cpuX’s hardware threads within the same book_id. The format is like 0-3, 8-11, 14,17. it’s only used on s390. Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/cluster_cpus

Defined on file sysfs-devices-system-cpu

internal kernel map of CPUs within the same cluster. Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/cluster_cpus_list

Defined on file sysfs-devices-system-cpu

human-readable list of CPUs within the same cluster. The format is like 0-3, 8-11, 14,17. Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/cluster_id

Defined on file sysfs-devices-system-cpu

the cluster ID of cpuX. Typically it is the hardware platform’s identifier (rather than the kernel’s). The actual value is architecture and platform dependent. Values: integer

/sys/devices/system/cpu/cpuX/topology/core_cpus

Defined on file sysfs-devices-system-cpu

internal kernel map of CPUs within the same core. (deprecated name: “thread_siblings”) Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/core_cpus_list

Defined on file sysfs-devices-system-cpu

human-readable list of CPUs within the same core. The format is like 0-3, 8-11, 14,17. (deprecated name: “thread_siblings_list”). Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/core_id

Defined on file sysfs-devices-system-cpu

the CPU core ID of cpuX. Typically it is the hardware platform’s identifier (rather than the kernel’s). The actual value is architecture and platform dependent. Values: integer

/sys/devices/system/cpu/cpuX/topology/die_cpus

Defined on file sysfs-devices-system-cpu

internal kernel map of CPUs within the same die. Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/die_cpus_list

Defined on file sysfs-devices-system-cpu

human-readable list of CPUs within the same die. The format is like 0-3, 8-11, 14,17. Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/die_id

Defined on file sysfs-devices-system-cpu

the CPU die ID of cpuX. Typically it is the hardware platform’s identifier (rather than the kernel’s). The actual value is architecture and platform dependent. Values: integer

/sys/devices/system/cpu/cpuX/topology/drawer_id

Defined on file sysfs-devices-system-cpu

the drawer ID of cpuX. Typically it is the hardware platform’s identifier (rather than the kernel’s). The actual value is architecture and platform dependent. it’s only used on s390. Values: integer

/sys/devices/system/cpu/cpuX/topology/drawer_siblings

Defined on file sysfs-devices-system-cpu

internal kernel map of cpuX’s hardware threads within the same drawer_id. it’s only used on s390. Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/drawer_siblings_list

Defined on file sysfs-devices-system-cpu

human-readable list of cpuX’s hardware threads within the same drawer_id. The format is like 0-3, 8-11, 14,17. it’s only used on s390. Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/package_cpus

Defined on file sysfs-devices-system-cpu

internal kernel map of the CPUs sharing the same physical_package_id. (deprecated name: “core_siblings”). Values: hexadecimal bitmask.

/sys/devices/system/cpu/cpuX/topology/package_cpus_list

Defined on file sysfs-devices-system-cpu

human-readable list of CPUs sharing the same physical_package_id. The format is like 0-3, 8-11, 14,17. (deprecated name: “core_siblings_list”) Values: decimal list.

/sys/devices/system/cpu/cpuX/topology/physical_package_id

Defined on file sysfs-devices-system-cpu

physical package id of cpuX. Typically corresponds to a physical socket number, but the actual value is architecture and platform dependent. Values: integer

/sys/devices/system/cpu/cpuX/topology/ppin

Defined on file sysfs-devices-system-cpu

per-socket protected processor inventory number Values: hexadecimal.

/sys/devices/system/cpu/cpu[0-9]+/dscr

Defined on file sysfs-devices-system-cpu

Default value for the Data Stream Control Register (DSCR) on a CPU. This default value is used when the kernel is executing and for any process that has not set the DSCR itself. If a process ever sets the DSCR (via direct access to the SPR) that value will be persisted for that process and used on any CPU where it executes (overriding the value described here). If set by a process it will be inherited by child processes. Values: 64 bit unsigned integer (bit field)

/sys/devices/system/cpu/dscr_default

Defined on file sysfs-devices-system-cpu

Writes are equivalent to writing to /sys/devices/system/cpu/cpuN/dscr on all CPUs. Reads return the last written value or 0. This value is not a global default: it is a way to set all per-CPU defaults at the same time. Values: 64 bit unsigned integer (bit field)

/sys/devices/system/node/has_cpu

Defined on file sysfs-devices-node

Nodes that have one or more CPUs.

/sys/devices/system/node/has_high_memory

Defined on file sysfs-devices-node

Nodes that have regular or high memory. Depends on CONFIG_HIGHMEM.

/sys/devices/system/node/has_normal_memory

Defined on file sysfs-devices-node

Nodes that have regular memory.

/sys/devices/system/node/nodeX

Defined on file sysfs-devices-node

When CONFIG_NUMA is enabled, this is a directory containing information on node X such as what CPUs are local to the node. Each file is detailed next.

/sys/devices/system/node/nodeX/accessY/

Defined on file sysfs-devices-node

The node’s relationship to other nodes for access class “Y”.

/sys/devices/system/node/nodeX/accessY/initiators/

Defined on file sysfs-devices-node

The directory containing symlinks to memory initiator nodes that have class “Y” access to this target node’s memory. CPUs and other memory initiators in nodes not in the list accessing this node’s memory may have different performance.

/sys/devices/system/node/nodeX/accessY/initiators/read_bandwidth

Defined on file sysfs-devices-node

This node’s read bandwidth in MB/s when accessed from nodes found in this access class’s linked initiators.

/sys/devices/system/node/nodeX/accessY/initiators/read_latency

Defined on file sysfs-devices-node

This node’s read latency in nanoseconds when accessed from nodes found in this access class’s linked initiators.

/sys/devices/system/node/nodeX/accessY/initiators/write_bandwidth

Defined on file sysfs-devices-node

This node’s write bandwidth in MB/s when accessed from found in this access class’s linked initiators.

/sys/devices/system/node/nodeX/accessY/initiators/write_latency

Defined on file sysfs-devices-node

This node’s write latency in nanoseconds when access from nodes found in this class’s linked initiators.

/sys/devices/system/node/nodeX/accessY/targets/

Defined on file sysfs-devices-node

The directory containing symlinks to memory targets that this initiator node has class “Y” access.

/sys/devices/system/node/nodeX/compact

Defined on file sysfs-devices-node

When this file is written to, all memory within that node will be compacted. When it completes, memory will be freed into blocks which have as many contiguous pages as possible

/sys/devices/system/node/nodeX/cpulist

Defined on file sysfs-devices-node

The CPUs associated to the node.

/sys/devices/system/node/nodeX/cpumap

Defined on file sysfs-devices-node

The node’s cpumap.

/sys/devices/system/node/nodeX/distance

Defined on file sysfs-devices-node

Distance between the node and all the other nodes in the system.

/sys/devices/system/node/nodeX/hugepages/hugepages-<size>/

Defined on file sysfs-devices-node

The node’s huge page size control/query attributes. See HugeTLB Pages

/sys/devices/system/node/nodeX/meminfo

Defined on file sysfs-devices-node

Provides information about the node’s distribution and memory utilization. Similar to /proc/meminfo, see The /proc Filesystem

/sys/devices/system/node/nodeX/memory_failure/delayed

Defined on file sysfs-devices-node

Of the raw poisoned pages on a NUMA node, how many pages are delayed by memory error recovery attempt. Delayed poisoned pages usually will be retried by kernel.

/sys/devices/system/node/nodeX/memory_failure/failed

Defined on file sysfs-devices-node

Of the raw poisoned pages on a NUMA node, how many pages are failed by memory error recovery attempt. This usually means a key recovery operation failed.

/sys/devices/system/node/nodeX/memory_failure/ignored

Defined on file sysfs-devices-node

Of the raw poisoned pages on a NUMA node, how many pages are ignored by memory error recovery attempt, usually because support for this type of pages is unavailable, and kernel gives up the recovery.

/sys/devices/system/node/nodeX/memory_failure/recovered

Defined on file sysfs-devices-node

Of the raw poisoned pages on a NUMA node, how many pages are recovered by memory error recovery attempt.

/sys/devices/system/node/nodeX/memory_failure/total

Defined on file sysfs-devices-node

The total number of raw poisoned pages (pages containing corrupted data due to memory errors) on a NUMA node.

/sys/devices/system/node/nodeX/memory_side_cache/indexY/

Defined on file sysfs-devices-node

The directory containing attributes for the memory-side cache level ‘Y’.

/sys/devices/system/node/nodeX/memory_side_cache/indexY/indexing

Defined on file sysfs-devices-node

The caches associativity indexing: 0 for direct mapped, non-zero if indexed.

/sys/devices/system/node/nodeX/memory_side_cache/indexY/line_size

Defined on file sysfs-devices-node

The number of bytes accessed from the next cache level on a cache miss.

/sys/devices/system/node/nodeX/memory_side_cache/indexY/size

Defined on file sysfs-devices-node

The size of this memory side cache in bytes.

/sys/devices/system/node/nodeX/memory_side_cache/indexY/write_policy

Defined on file sysfs-devices-node

The cache write policy: 0 for write-back, 1 for write-through, other or unknown.

/sys/devices/system/node/nodeX/numastat

Defined on file sysfs-devices-node

The node’s hit/miss statistics, in units of pages. See Numa policy hit/miss statistics

/sys/devices/system/node/nodeX/vmstat

Defined on file sysfs-devices-node

The node’s zoned virtual memory statistics. This is a superset of numastat.

/sys/devices/system/node/nodeX/x86/sgx_total_bytes

Defined on file sysfs-devices-node

The total amount of SGX physical memory in bytes.

/sys/devices/system/node/online

Defined on file sysfs-devices-node

Nodes that are online.

/sys/devices/system/node/possible

Defined on file sysfs-devices-node

Nodes that could be possibly become online at some point.

/sys/devices/system/xen_memory/xen_memory0/info/current_kb

Defined on file sysfs-devices-system-xen_memory

Current size (in KiB) of this domain’s memory reservation.

/sys/devices/system/xen_memory/xen_memory0/info/high_kb

Defined on file sysfs-devices-system-xen_memory

Amount (in KiB) of high memory in the balloon.

/sys/devices/system/xen_memory/xen_memory0/info/low_kb

Defined on file sysfs-devices-system-xen_memory

Amount (in KiB) of low (or normal) memory in the balloon.

/sys/devices/system/xen_memory/xen_memory0/max_retry_count

Defined on file sysfs-devices-system-xen_memory

The maximum number of times the balloon driver will attempt to increase the balloon before giving up. See also ‘retry_count’ below. A value of zero means retry forever and is the default one.

/sys/devices/system/xen_memory/xen_memory0/max_schedule_delay

Defined on file sysfs-devices-system-xen_memory

The limit that ‘schedule_delay’ (see below) will be increased to. The default value is 32 seconds.

/sys/devices/system/xen_memory/xen_memory0/retry_count

Defined on file sysfs-devices-system-xen_memory

The current number of times that the balloon driver has attempted to increase the size of the balloon. The default value is one. With max_retry_count being zero (unlimited), this means that the driver will attempt to retry with a ‘schedule_delay’ delay.

/sys/devices/system/xen_memory/xen_memory0/schedule_delay

Defined on file sysfs-devices-system-xen_memory

The time (in seconds) to wait between attempts to increase the balloon. Each time the balloon cannot be increased, ‘schedule_delay’ is increased (until ‘max_schedule_delay’ is reached at which point it will use the max value).

/sys/devices/system/xen_memory/xen_memory0/scrub_pages

Defined on file sysfs-devices-system-xen_memory

Control scrubbing pages before returning them to Xen for others domains use. Can be set with xen_scrub_pages cmdline parameter. Default value controlled with CONFIG_XEN_SCRUB_PAGES_DEFAULT.

/sys/devices/system/xen_memory/xen_memory0/target

Defined on file sysfs-devices-system-xen_memory

The target number of pages to adjust this domain’s memory reservation to.

/sys/devices/system/xen_memory/xen_memory0/target_kb

Defined on file sysfs-devices-system-xen_memory

As target above, except the value is in KiB.

## Symbols under /sys/firmware

/sys/firmware/acpi/pm_profile

Defined on file sysfs-acpi-pmprofile

The ACPI pm_profile sysfs interface exposes the preferred power management (and performance) profile of the platform as provided in the ACPI FADT Preferred_PM_Profile field.

The integer value is directly passed as retrieved from the FADT.

Values: For the possible values refer to the Preferred_PM_Profile field

  definition in Table 5.9 “FADT Format”, Section 5.2.9 “Fixed ACPI Description Table (FADT)” of the ACPI specification.

  As of ACPI 6.5, the following values are defined:

  0 | Unspecified
  1 | Desktop
  2 | Mobile
  3 | Workstation
  4 | Enterprise Server
  5 | SOHO Server
  6 | Appliance PC
  7 | Performance Server
  8 | Tablet
  >8 | Reserved

/sys/firmware/opal/dump

Defined on file sysfs-firmware-opal-dump

This directory exposes interfaces for interacting with the FSP and platform dumps through OPAL firmware interface.

This is only for the powerpc/powernv platform.

initiate_dump: | When ‘1’ is written to it, we will initiate a dump. Read this file for supported commands.
0xXX-0xYYYY: | A directory for dump of type 0xXX and id 0xYYYY (in hex). The name of this directory should not be relied upon to be in this format, only that it’s unique among all dumps. For determining the type and ID of the dump, use the id and type files. Do not rely on any particular size of dump type or dump id.

Each dump has the following files:

id: | An ASCII representation of the dump ID in hex (e.g. ‘0x01’)
type: | An ASCII representation of the type of dump in the format “0x%x %s” with the ID in hex and a description of the dump type (or ‘unknown’). Type ‘0xffffffff unknown’ is used when we could not get the type from firmware. e.g. ‘0x02 System/Platform Dump’
dump: | A binary file containing the dump. The size of the dump is the size of this file.
acknowledge: | When ‘ack’ is written to this, we will acknowledge that we’ve retrieved the dump to the service processor. It will then remove it, making the dump inaccessible. Reading this file will get a list of supported actions.

/sys/firmware/opal/elog

Defined on file sysfs-firmware-opal-elog

This directory exposes error log entries retrieved through the OPAL firmware interface.

Each error log is identified by a unique ID and will exist until explicitly acknowledged to firmware.

Each log entry has a directory in /sys/firmware/opal/elog.

Log entries may be purged by the service processor before retrieved by firmware or retrieved/acknowledged by Linux if there is no room for more log entries.

In the event that Linux has retrieved the log entries but not explicitly acknowledged them to firmware and the service processor needs more room for log entries, the only remaining copy of a log message may be in Linux.

Typically, a user space daemon will monitor for new entries, read them out and acknowledge them.

The service processor may be able to store more log entries than firmware can, so after you acknowledge an event from Linux you may instantly get another one from the queue that was generated some time in the past.

The raw log format is a binary format. We currently do not parse this at all in kernel, leaving it up to user space to solve the problem. In future, we may do more parsing in kernel and add more files to make it easier for simple user space processes to extract more information.

For each log entry (directory), there are the following files:

id: | An ASCII representation of the ID of the error log, in hex - e.g. “0x01”.
type: | An ASCII representation of the type id and description of the type of error log. Currently just “0x00 PEL” - platform error log. In the future there may be additional types.
raw: | A read-only binary file that can be read to get the raw log entry. These are <16kb, often just hundreds of bytes and “average” 2kb.
acknowledge: | Writing ‘ack’ to this file will acknowledge the error log to firmware (and in turn the service processor, if applicable). Shortly after acknowledging it, the log entry will be removed from sysfs. Reading this file will list the supported operations (currently just acknowledge).

## Symbols under /sys/fs

/sys/fs/o2cb/

Defined on file o2cb

Ocfs2-tools looks at ‘interface-revision’ for versioning information. Each logmask/ file controls a set of debug prints and can be written into with the strings “allow”, “deny”, or “off”. Reading the file returns the current state.

Users: ocfs2-tools. It’s sufficient to mail proposed changes to ocfs2-devel@lists.linux.dev.

/sys/fs/orangefs/acache/*

Defined on file sysfs-fs-orangefs

Attribute cache configurable settings.

/sys/fs/orangefs/capcache/*

Defined on file sysfs-fs-orangefs

Capability cache configurable settings.

/sys/fs/orangefs/ccache/*

Defined on file sysfs-fs-orangefs

Credential cache configurable settings.

/sys/fs/orangefs/ncache/*

Defined on file sysfs-fs-orangefs

Name cache configurable settings.

/sys/fs/orangefs/op_timeout_secs

Defined on file sysfs-fs-orangefs

Service operation timeout in seconds.

/sys/fs/orangefs/perf_counter_reset

Defined on file sysfs-fs-orangefs

echo a 0 or a 1 into perf_counter_reset to reset all the counters in /sys/fs/orangefs/perf_counters except ones with PINT_PERF_PRESERVE set.

/sys/fs/orangefs/perf_counters/*

Defined on file sysfs-fs-orangefs

Counters and settings for various caches. Read only.

/sys/fs/orangefs/perf_history_size

Defined on file sysfs-fs-orangefs

The perf_counters cache statistics have N, or perf_history_size, samples. The default is one.

Every perf_time_interval_secs the (first) samples are reset.

If N is greater than one, the “current” set of samples is reset, and the samples from the other N-1 intervals remain available.

/sys/fs/orangefs/perf_time_interval_secs

Defined on file sysfs-fs-orangefs

Length of perf counter intervals in seconds.

/sys/fs/orangefs/slot_timeout_secs

Defined on file sysfs-fs-orangefs

“Slot” timeout in seconds. A “slot” is an indexed buffer in the shared memory segment used for communication between the kernel module and userspace. Slots are requested and waited for, the wait times out after slot_timeout_secs.

## Symbols under /sys/hypervisor

/sys/hypervisor/compilation/compile_date

Defined on file sysfs-hypervisor-xen

If running under Xen: Contains the build time stamp of the Xen hypervisor Might return “<denied>” in case of special security settings in the hypervisor.

/sys/hypervisor/compilation/compiled_by

Defined on file sysfs-hypervisor-xen

If running under Xen: Contains information who built the Xen hypervisor Might return “<denied>” in case of special security settings in the hypervisor.

/sys/hypervisor/compilation/compiler

Defined on file sysfs-hypervisor-xen

If running under Xen: Compiler which was used to build the Xen hypervisor Might return “<denied>” in case of special security settings in the hypervisor.

/sys/hypervisor/properties/capabilities

Defined on file sysfs-hypervisor-xen

If running under Xen: Space separated list of supported guest system types. Each type is in the format: <class>-<major>.<minor>-<arch> With:

> <class>: | “xen” -- x86: paravirtualized, arm: standard “hvm” -- x86 only: fully virtualized
> <major>: | major guest interface version
> <minor>: | minor guest interface version
> <arch>: | architecture, e.g.: “x86_32”: 32 bit x86 guest without PAE “x86_32p”: 32 bit x86 guest with PAE “x86_64”: 64 bit x86 guest “armv7l”: 32 bit arm guest “aarch64”: 64 bit arm guest

/sys/hypervisor/properties/changeset

Defined on file sysfs-hypervisor-xen

If running under Xen: Changeset of the hypervisor (git commit) Might return “<denied>” in case of special security settings in the hypervisor.

/sys/hypervisor/properties/features

Defined on file sysfs-hypervisor-xen

If running under Xen: Features the Xen hypervisor supports for the guest as defined in include/xen/interface/features.h printed as a hex value.

/sys/hypervisor/properties/pagesize

Defined on file sysfs-hypervisor-xen

If running under Xen: Default page size of the hypervisor printed as a hex value. Might return “0” in case of special security settings in the hypervisor.

/sys/hypervisor/properties/virtual_start

Defined on file sysfs-hypervisor-xen

If running under Xen: Virtual address of the hypervisor as a hex value.

/sys/hypervisor/start_flags/*

Defined on file sysfs-hypervisor-xen

If running under Xen: All bits in Xen’s start-flags are represented as boolean files, returning ‘1’ if set, ‘0’ otherwise. This takes the place of the defunct /proc/xen/capabilities, which would contain “control_d” on dom0, and be empty otherwise. This flag is now exposed as “initdomain” in addition to the “privileged” flag; all other possible flags are accessible as “unknownXX”.

/sys/hypervisor/type

Defined on file sysfs-hypervisor-xen

If running under Xen: Type of hypervisor: “xen”: Xen hypervisor

/sys/hypervisor/uuid

Defined on file sysfs-hypervisor-xen

If running under Xen: UUID of the guest as known to the Xen hypervisor.

/sys/hypervisor/version/extra

Defined on file sysfs-hypervisor-xen

If running under Xen: The Xen version is in the format <major>.<minor><extra> This is the <extra> part of it. Might return “<denied>” in case of special security settings in the hypervisor.

/sys/hypervisor/version/major

Defined on file sysfs-hypervisor-xen

If running under Xen: The Xen version is in the format <major>.<minor><extra> This is the <major> part of it.

/sys/hypervisor/version/minor

Defined on file sysfs-hypervisor-xen

If running under Xen: The Xen version is in the format <major>.<minor><extra> This is the <minor> part of it.

## Symbols under /sys/kernel

/sys/kernel/notes

Defined on file sysfs-kernel-notes

The /sys/kernel/notes file contains the binary representation of the running vmlinux’s .notes section.

## Symbols under /sys/module

/sys/module/<MODULENAME>

Defined on file sysfs-module

The name of the module that is in the kernel. This module name will always show up if the module is loaded as a dynamic module. If it is built directly into the kernel, it will only show up if it has a version or at least one parameter.

Note: The conditions of creation in the built-in case are not by design and may be removed in the future.

/sys/module/<MODULENAME>/parameters

Defined on file sysfs-module

This directory contains individual files that are each individual parameters of the module that are able to be changed at runtime. See the individual module documentation as to the contents of these parameters and what they accomplish.

Note: The individual parameter names and values are not considered stable, only the fact that they will be placed in this location within sysfs. See the individual driver documentation for details as to the stability of the different parameters.

/sys/module/<MODULENAME>/refcnt

Defined on file sysfs-module

If the module is able to be unloaded from the kernel, this file will contain the current reference count of the module.

Note: If the module is built into the kernel, or if the CONFIG_MODULE_UNLOAD kernel configuration value is not enabled, this file will not be present.

/sys/module/<MODULENAME>/srcversion

Defined on file sysfs-module

If the module source has MODULE_VERSION, this file will contain the checksum of the source code.

/sys/module/<MODULENAME>/version

Defined on file sysfs-module

If the module source has MODULE_VERSION, this file will contain the version of the source code.

## A notification mechanism for thermal related events

A notification mechanism for thermal related events

Defined on file thermal-notification

This interface enables notification for thermal related events. The notification is in the form of a netlink event.

## Audit Login Session ID

Audit Login Session ID

Defined on file procfs-audit_loginuid

The /proc/$pid/sessionid pseudofile is read to get the audit login session ID of process $pid as a decimal unsigned int (%u, u32). It is set automatically, serially assigned with each new login.

Users: audit and login applications

## Audit Login UID

Audit Login UID

Defined on file procfs-audit_loginuid

The /proc/$pid/loginuid pseudofile is written to set and read to get the audit login UID of process $pid as a decimal unsigned int (%u, u32). If it is unset, permissions are not needed to set it. The accessor must have CAP_AUDIT_CONTROL in the initial user namespace to write it if it has been set. It cannot be written again if AUDIT_FEATURE_LOGINUID_IMMUTABLE is enabled. It cannot be unset if AUDIT_FEATURE_ONLY_UNSET_LOGINUID is enabled.

Users: audit and login applications

## The kernel syscall interface

The kernel syscall interface

Defined on file syscalls

This interface matches much of the POSIX interface and is based on it and other Unix based interfaces. It will only be added to over time, and not have things removed from it.

Note that this interface is different for every architecture that Linux supports. Please see the architecture-specific documentation for details on the syscall numbers that are to be mapped to each syscall.

## vDSO

vDSO

Defined on file vdso

On some architectures, when the kernel loads any userspace program it maps an ELF DSO into that program’s address space. This DSO is called the vDSO and it often contains useful and highly-optimized alternatives to real syscalls.

These functions are called according to your platform’s ABI. On many platforms they are called just like ordinary C function. On other platforms (ex: powerpc) they are called with the same convention as system calls which is different from ordinary C functions. Call them from a sensible context. (For example, if you set CS on x86 to something strange, the vDSO functions are within their rights to crash.) In addition, if you pass a bad pointer to a vDSO function, you might get SIGSEGV instead of -EFAULT.

To find the DSO, parse the auxiliary vector passed to the program’s entry point. The AT_SYSINFO_EHDR entry will point to the vDSO.

The vDSO uses symbol versioning; whenever you request a symbol from the vDSO, specify the version you are expecting.

Programs that dynamically link to glibc will use the vDSO automatically. Otherwise, you can use the reference parser in tools/testing/selftests/vDSO/parse_vdso.c.

Unless otherwise noted, the set of symbols with any given version and the ABI of those symbols is considered stable. It may vary across architectures, though.

Note:

  As of this writing, this ABI documentation as been confirmed for x86_64. The maintainers of the other vDSO-using architectures should confirm that it is correct for their architecture.

## File stable/firewire-cdev

Has the following ABI:

- /dev/fw[0-9]+

## File stable/o2cb

Has the following ABI:

- /sys/fs/o2cb/

## File stable/procfs-audit_loginuid

Has the following ABI:

- Audit Login UID

- Audit Login Session ID

## File stable/syscalls

Has the following ABI:

- The kernel syscall interface

## File stable/sysfs-acpi-pmprofile

Has the following ABI:

- /sys/firmware/acpi/pm_profile

## File stable/sysfs-block

Has the following ABI:

- /sys/block/<disk>/alignment_offset

- /sys/block/<disk>/discard_alignment

- /sys/block/<disk>/atomic_write_max_bytes

- /sys/block/<disk>/atomic_write_unit_min_bytes

- /sys/block/<disk>/atomic_write_unit_max_bytes

- /sys/block/<disk>/atomic_write_boundary_bytes

- /sys/block/<disk>/diskseq

- /sys/block/<disk>/inflight

- /sys/block/<disk>/integrity/device_is_integrity_capable

- /sys/block/<disk>/integrity/format

- /sys/block/<disk>/integrity/protection_interval_bytes

- /sys/block/<disk>/integrity/read_verify

- /sys/block/<disk>/integrity/tag_size

- /sys/block/<disk>/integrity/write_generate

- /sys/block/<disk>/partscan

- /sys/block/<disk>/<partition>/alignment_offset

- /sys/block/<disk>/<partition>/discard_alignment

- /sys/block/<disk>/<partition>/stat

- /sys/block/<disk>/queue/add_random

- /sys/block/<disk>/queue/chunk_sectors

- /sys/block/<disk>/queue/crypto/

- /sys/block/<disk>/queue/crypto/max_dun_bits

- /sys/block/<disk>/queue/crypto/modes/<mode>

- /sys/block/<disk>/queue/crypto/num_keyslots

- /sys/block/<disk>/queue/dax

- /sys/block/<disk>/queue/discard_granularity

- /sys/block/<disk>/queue/discard_max_bytes

- /sys/block/<disk>/queue/discard_max_hw_bytes

- /sys/block/<disk>/queue/discard_zeroes_data

- /sys/block/<disk>/queue/dma_alignment

- /sys/block/<disk>/queue/fua

- /sys/block/<disk>/queue/hw_sector_size

- /sys/block/<disk>/queue/independent_access_ranges/

- /sys/block/<disk>/queue/io_poll

- /sys/block/<disk>/queue/io_poll_delay

- /sys/block/<disk>/queue/io_timeout

- /sys/block/<disk>/queue/iostats

- /sys/block/<disk>/queue/iostats_passthrough

- /sys/block/<disk>/queue/logical_block_size

- /sys/block/<disk>/queue/max_active_zones

- /sys/block/<disk>/queue/max_discard_segments

- /sys/block/<disk>/queue/max_hw_sectors_kb

- /sys/block/<disk>/queue/max_integrity_segments

- /sys/block/<disk>/queue/max_open_zones

- /sys/block/<disk>/queue/max_sectors_kb

- /sys/block/<disk>/queue/max_segment_size

- /sys/block/<disk>/queue/max_segments

- /sys/block/<disk>/queue/minimum_io_size

- /sys/block/<disk>/queue/nomerges

- /sys/block/<disk>/queue/nr_requests

- /sys/block/<disk>/queue/nr_zones

- /sys/block/<disk>/queue/optimal_io_size

- /sys/block/<disk>/queue/physical_block_size

- /sys/block/<disk>/queue/read_ahead_kb

- /sys/block/<disk>/queue/rotational

- /sys/block/<disk>/queue/rq_affinity

- /sys/block/<disk>/queue/scheduler

- /sys/block/<disk>/queue/stable_writes

- /sys/block/<disk>/queue/virt_boundary_mask

- /sys/block/<disk>/queue/wbt_lat_usec

- /sys/block/<disk>/queue/write_cache

- /sys/block/<disk>/queue/write_same_max_bytes

- /sys/block/<disk>/queue/write_zeroes_max_bytes

- /sys/block/<disk>/queue/zone_append_max_bytes

- /sys/block/<disk>/queue/zone_write_granularity

- /sys/block/<disk>/queue/zoned

- /sys/block/<disk>/hidden

- /sys/block/<disk>/stat

## File stable/sysfs-bus-firewire

Has the following ABI:

- /sys/bus/firewire/devices/fw[0-9]+/

- /sys/bus/firewire/devices/fw[0-9]+/units

- /sys/bus/firewire/devices/fw[0-9]+/is_local

- /sys/bus/firewire/devices/fw[0-9]+[.][0-9]+/

- /sys/bus/firewire/devices/*/

- /sys/bus/firewire/drivers/sbp2/fw*/host*/target*/*:*:*:*/ieee1394_id

## File stable/sysfs-bus-fsl-mc

Has the following ABI:

- /sys/bus/fsl-mc/rescan

- /sys/bus/fsl-mc/autorescan

## File stable/sysfs-bus-mhi

Has the following ABI:

- /sys/bus/mhi/devices/.../serialnumber

- /sys/bus/mhi/devices/.../oem_pk_hash

- /sys/bus/mhi/devices/.../soc_reset

- /sys/bus/mhi/devices/.../trigger_edl

## File stable/sysfs-bus-nvmem

Has the following ABI:

- /sys/bus/nvmem/devices/.../force_ro

- /sys/bus/nvmem/devices/.../nvmem

- /sys/bus/nvmem/devices/.../type

## File stable/sysfs-bus-usb

Has the following ABI:

- /sys/bus/usb/devices/.../power/persist

- /sys/bus/usb/devices/.../power/autosuspend

- /sys/bus/usb/device/.../power/connected_duration

- /sys/bus/usb/device/.../power/active_duration

- /sys/bus/usb/devices/<busnum>-<port[.port]>...:<config num>-<interface num>/supports_autosuspend

- /sys/bus/usb/device/.../avoid_reset_quirk

- /sys/bus/usb/devices/.../devnum

- /sys/bus/usb/devices/.../bConfigurationValue

- /sys/bus/usb/devices/.../busnum

- /sys/bus/usb/devices/.../descriptors

- /sys/bus/usb/devices/.../speed

## File stable/sysfs-bus-vmbus

Has the following ABI:

- /sys/bus/vmbus/hibernation

- /sys/bus/vmbus/devices/<UUID>/id

- /sys/bus/vmbus/devices/<UUID>/class_id

- /sys/bus/vmbus/devices/<UUID>/device_id

- /sys/bus/vmbus/devices/<UUID>/channel_vp_mapping

- /sys/bus/vmbus/devices/<UUID>/device

- /sys/bus/vmbus/devices/<UUID>/vendor

- /sys/bus/vmbus/devices/<UUID>/numa_node

- /sys/bus/vmbus/devices/<UUID>/channels/<N>

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/cpu

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/in_mask

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/latency

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_mask

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/pending

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/read_avail

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/write_avail

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/events

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/interrupts

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/subchannel_id

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/monitor_id

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/ring

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_in_full

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_out_empty

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_first

- /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_total

## File stable/sysfs-bus-w1

Has the following ABI:

- /sys/bus/w1/devices/.../w1_master_timeout_us

## File stable/sysfs-bus-xen-backend

Has the following ABI:

- /sys/bus/xen-backend/devices/*/devtype

- /sys/bus/xen-backend/devices/*/nodename

- /sys/bus/xen-backend/devices/vbd-*/physical_device

- /sys/bus/xen-backend/devices/vbd-*/mode

- /sys/bus/xen-backend/devices/vbd-*/statistics/f_req

- /sys/bus/xen-backend/devices/vbd-*/statistics/oo_req

- /sys/bus/xen-backend/devices/vbd-*/statistics/rd_req

- /sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect

- /sys/bus/xen-backend/devices/vbd-*/statistics/wr_req

- /sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect

- /sys/bus/xen-backend/devices/*/state

## File stable/sysfs-class-backlight

Has the following ABI:

- /sys/class/backlight/<backlight>/bl_power

- /sys/class/backlight/<backlight>/brightness

- /sys/class/backlight/<backlight>/actual_brightness

- /sys/class/backlight/<backlight>/max_brightness

- /sys/class/backlight/<backlight>/type

## File stable/sysfs-class-bluetooth

Has the following ABI:

- /sys/class/bluetooth/hci<index>/reset

## File stable/sysfs-class-infiniband

sysfs interface common for all infiniband devices

Has the following ABI:

- /sys/class/infiniband/<device>/node_type

- /sys/class/infiniband/<device>/node_guid

- /sys/class/infiniband/<device>/sys_image_guid

- /sys/class/infiniband/<device>/node_desc

- /sys/class/infiniband/<device>/fw_ver

- /sys/class/infiniband/<device>/ports/<port-num>/lid

- /sys/class/infiniband/<device>/ports/<port-num>/rate

- /sys/class/infiniband/<device>/ports/<port-num>/lid_mask_count

- /sys/class/infiniband/<device>/ports/<port-num>/sm_sl

- /sys/class/infiniband/<device>/ports/<port-num>/sm_lid

- /sys/class/infiniband/<device>/ports/<port-num>/state

- /sys/class/infiniband/<device>/ports/<port-num>/phys_state

- /sys/class/infiniband/<device>/ports/<port-num>/cap_mask

- /sys/class/infiniband/<device>/ports/<port-num>/link_layer

- /sys/class/infiniband/<device>/ports/<port-num>/counters/symbol_error

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_remote_physical_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_switch_relay_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/link_error_recovery

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_constraint_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_contraint_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/local_link_integrity_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/excessive_buffer_overrun_errors

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_data

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_data

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_rcv_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/unicast_rcv_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/unicast_xmit_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/multicast_rcv_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/multicast_xmit_packets

- /sys/class/infiniband/<device>/ports/<port-num>/counters/link_downed

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_discards

- /sys/class/infiniband/<device>/ports/<port-num>/counters/VL15_dropped

- /sys/class/infiniband/<device>/ports/<port-num>/counters/port_xmit_wait

- /sys/class/infiniband/<device-name>/hw_counters/lifespan

- /sys/class/infiniband/<device-name>/ports/<port-num>/hw_counters/lifespan

- /sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/ndevs/<gid-index>

- /sys/class/infiniband/<hca>/ports/<port-number>/gid_attrs/types/<gid-index>

- /sys/class/infiniband_mad/umad<N>/ibdev

- /sys/class/infiniband_mad/umad<N>/port

- /sys/class/infiniband_mad/issm<N>/ibdev

- /sys/class/infiniband_mad/issm<N>/port

- /sys/class/infiniband_mad/abi_version

- /sys/class/infiniband_verbs/uverbs<N>/ibdev

- /sys/class/infiniband_verbs/uverbs<N>/abi_version

- /sys/class/infiniband_verbs/abi_version

- /sys/class/infiniband/mthcaX/hw_rev

- /sys/class/infiniband/mthcaX/hca_type

- /sys/class/infiniband/mthcaX/board_id

- /sys/class/infiniband/mlx4_X/hw_rev

- /sys/class/infiniband/mlx4_X/hca_type

- /sys/class/infiniband/mlx4_X/board_id

- /sys/class/infiniband/mlx4_X/iov/ports/<port-num>/gids/<n>

- /sys/class/infiniband/mlx4_X/iov/ports/<port-num>/admin_guids/<n>

- /sys/class/infiniband/mlx4_X/iov/ports/<port-num>/pkeys/<n>

- /sys/class/infiniband/mlx4_X/iov/ports/<port-num>/mcgs/

- /sys/class/infiniband/mlx4_X/iov/ports/<pci-slot-num>/ports/<m>/gid_idx/0

- /sys/class/infiniband/mlx4_X/iov/ports/<pci-slot-num>/ports/<m>/pkey_idx/<n>

- /sys/class/infiniband/mlx4_X/iov/<pci-slot-num>/ports/<m>/smi_enabled

- /sys/class/infiniband/mlx4_X/iov/<pci-slot-num>/ports/<m>/enable_smi_admin

- /sys/class/infiniband/cxgb4_X/hw_rev

- /sys/class/infiniband/cxgb4_X/hca_type

- /sys/class/infiniband/cxgb4_X/board_id

- /sys/class/infiniband/qibX/version

- /sys/class/infiniband/qibX/hw_rev

- /sys/class/infiniband/qibX/hca_type

- /sys/class/infiniband/qibX/board_id

- /sys/class/infiniband/qibX/boardversion

- /sys/class/infiniband/qibX/nctxts

- /sys/class/infiniband/qibX/localbus_info

- /sys/class/infiniband/qibX/tempsense

- /sys/class/infiniband/qibX/serial

- /sys/class/infiniband/qibX/nfreectxts

- /sys/class/infiniband/qibX/chip_reset

- /sys/class/infiniband/qibX/ports/<N>/sl2vl/[0-15]

- /sys/class/infiniband/qibX/ports/<N>/CCMgtA/cc_settings_bin

- /sys/class/infiniband/qibX/ports/<N>/CCMgtA/cc_table_bin

- /sys/class/infiniband/qibX/ports/<N>/linkstate/loopback

- /sys/class/infiniband/qibX/ports/<N>/linkstate/led_override

- /sys/class/infiniband/qibX/ports/<N>/linkstate/hrtbt_enable

- /sys/class/infiniband/qibX/ports/<N>/linkstate/status

- /sys/class/infiniband/qibX/ports/<N>/linkstate/status_str

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/rc_resends

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/seq_naks

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/rdma_seq

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/rnr_naks

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/other_naks

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/rc_timeouts

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/look_pkts

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/pkt_drops

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/dma_wait

- /sys/class/infiniband/qibX/ports/<N>/diag_counters/unaligned

- /sys/class/infiniband/mlx5_X/hw_rev

- /sys/class/infiniband/mlx5_X/hca_type

- /sys/class/infiniband/mlx5_X/reg_pages

- /sys/class/infiniband/mlx5_X/fw_pages

- /sys/class/infiniband/usnic_X/board_id

- /sys/class/infiniband/usnic_X/config

- /sys/class/infiniband/usnic_X/qp_per_vf

- /sys/class/infiniband/usnic_X/max_vf

- /sys/class/infiniband/usnic_X/cq_per_vf

- /sys/class/infiniband/usnic_X/iface

- /sys/class/infiniband/usnic_X/qpn/summary

- /sys/class/infiniband/usnic_X/qpn/context

- /sys/class/infiniband/ocrdmaX/hw_rev

- /sys/class/infiniband/ocrdmaX/hca_type

- /sys/class/infiniband/hfi1_X/hw_rev

- /sys/class/infiniband/hfi1_X/board_id

- /sys/class/infiniband/hfi1_X/nctxts

- /sys/class/infiniband/hfi1_X/serial

- /sys/class/infiniband/hfi1_X/chip_reset

- /sys/class/infiniband/hfi1_X/boardversion

- /sys/class/infiniband/hfi1_X/nfreectxts

- /sys/class/infiniband/hfi1_X/tempsense

- /sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_settings_bin

- /sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_table_bin

- /sys/class/infiniband/hfi1_X/ports/<N>/CCMgtA/cc_prescan

- /sys/class/infiniband/hfi1_X/ports/<N>/sc2vl/[0-31]

- /sys/class/infiniband/hfi1_X/ports/<N>/sl2sc/[0-31]

- /sys/class/infiniband/hfi1_X/ports/<N>/vl2mtu/[0-15]

- /sys/class/infiniband/hfi1_X/sdma_<N>/cpu_list

- /sys/class/infiniband/hfi1_X/sdma_<N>/vl

- /sys/class/infiniband/qedrX/hw_rev

- /sys/class/infiniband/qedrX/hca_type

- /sys/class/infiniband/vmw_pvrdmaX/hw_rev

- /sys/class/infiniband/vmw_pvrdmaX/hca_type

- /sys/class/infiniband/vmw_pvrdmaX/board_id

- /sys/class/infiniband/bnxt_reX/hw_rev

- /sys/class/infiniband/bnxt_reX/hca_type

## File stable/sysfs-class-rfkill

rfkill - radio frequency (RF) connector kill switch support

For details to this subsystem look at rfkill - RF kill switch support.

For the deprecated `/sys/class/rfkill/*/claim` knobs of this interface look in removed/sysfs-class-rfkill.

Has the following ABI:

- /sys/class/rfkill

- /sys/class/rfkill/rfkill[0-9]+/name

- /sys/class/rfkill/rfkill[0-9]+/type

- /sys/class/rfkill/rfkill[0-9]+/persistent

- /sys/class/rfkill/rfkill[0-9]+/state

- /sys/class/rfkill/rfkill[0-9]+/hard

- /sys/class/rfkill/rfkill[0-9]+/soft

## File stable/sysfs-class-tpm

Has the following ABI:

- /sys/class/tpm/tpmX/device/

- /sys/class/tpm/tpmX/device/active

- /sys/class/tpm/tpmX/device/cancel

- /sys/class/tpm/tpmX/device/caps

- /sys/class/tpm/tpmX/device/durations

- /sys/class/tpm/tpmX/device/enabled

- /sys/class/tpm/tpmX/device/owned

- /sys/class/tpm/tpmX/device/pcrs

- /sys/class/tpm/tpmX/device/pubek

- /sys/class/tpm/tpmX/device/temp_deactivated

- /sys/class/tpm/tpmX/device/timeouts

- /sys/class/tpm/tpmX/tpm_version_major

- /sys/class/tpm/tpmX/pcr-<H>/<N>

## File stable/sysfs-class-ubi

Has the following ABI:

- /sys/class/ubi/

- /sys/class/ubi/version

- /sys/class/ubiX/

- /sys/class/ubi/ubiX/avail_eraseblocks

- /sys/class/ubi/ubiX/bad_peb_count

- /sys/class/ubi/ubiX/bgt_enabled

- /sys/class/ubi/ubiX/dev

- /sys/class/ubi/ubiX/eraseblock_size

- /sys/class/ubi/ubiX/max_ec

- /sys/class/ubi/ubiX/max_vol_count

- /sys/class/ubi/ubiX/min_io_size

- /sys/class/ubi/ubiX/mtd_num

- /sys/class/ubi/ubiX/reserved_for_bad

- /sys/class/ubi/ubiX/ro_mode

- /sys/class/ubi/ubiX/total_eraseblocks

- /sys/class/ubi/ubiX/volumes_count

- /sys/class/ubi/ubiX/ubiX_Y/

- /sys/class/ubi/ubiX/ubiX_Y/alignment

- /sys/class/ubi/ubiX/ubiX_Y/corrupted

- /sys/class/ubi/ubiX/ubiX_Y/data_bytes

- /sys/class/ubi/ubiX/ubiX_Y/dev

- /sys/class/ubi/ubiX/ubiX_Y/name

- /sys/class/ubi/ubiX/ubiX_Y/reserved_ebs

- /sys/class/ubi/ubiX/ubiX_Y/type

- /sys/class/ubi/ubiX/ubiX_Y/upd_marker

- /sys/class/ubi/ubiX/ubiX_Y/usable_eb_size

## File stable/sysfs-class-udc

Has the following ABI:

- /sys/class/udc/<udc>/a_alt_hnp_support

- /sys/class/udc/<udc>/a_hnp_support

- /sys/class/udc/<udc>/b_hnp_enable

- /sys/class/udc/<udc>/current_speed

- /sys/class/udc/<udc>/is_a_peripheral

- /sys/class/udc/<udc>/is_otg

- /sys/class/udc/<udc>/maximum_speed

- /sys/class/udc/<udc>/soft_connect

- /sys/class/udc/<udc>/srp

- /sys/class/udc/<udc>/state

- /sys/class/udc/<udc>/function

## File stable/sysfs-devices

Note:

  This documents additional properties of any device beyond what is documented in Rules on how to access information in sysfs

Has the following ABI:

- /sys/devices/*/of_node

- /sys/devices/*/devspec

- /sys/devices/*/obppath

- /sys/devices/*/dev

## File stable/sysfs-devices-node

Has the following ABI:

- /sys/devices/system/node/possible

- /sys/devices/system/node/online

- /sys/devices/system/node/has_normal_memory

- /sys/devices/system/node/has_cpu

- /sys/devices/system/node/has_high_memory

- /sys/devices/system/node/nodeX

- /sys/devices/system/node/nodeX/cpumap

- /sys/devices/system/node/nodeX/cpulist

- /sys/devices/system/node/nodeX/meminfo

- /sys/devices/system/node/nodeX/numastat

- /sys/devices/system/node/nodeX/distance

- /sys/devices/system/node/nodeX/vmstat

- /sys/devices/system/node/nodeX/compact

- /sys/devices/system/node/nodeX/hugepages/hugepages-<size>/

- /sys/devices/system/node/nodeX/accessY/

- /sys/devices/system/node/nodeX/accessY/initiators/

- /sys/devices/system/node/nodeX/accessY/targets/

- /sys/devices/system/node/nodeX/accessY/initiators/read_bandwidth

- /sys/devices/system/node/nodeX/accessY/initiators/read_latency

- /sys/devices/system/node/nodeX/accessY/initiators/write_bandwidth

- /sys/devices/system/node/nodeX/accessY/initiators/write_latency

- /sys/devices/system/node/nodeX/memory_side_cache/indexY/

- /sys/devices/system/node/nodeX/memory_side_cache/indexY/indexing

- /sys/devices/system/node/nodeX/memory_side_cache/indexY/line_size

- /sys/devices/system/node/nodeX/memory_side_cache/indexY/size

- /sys/devices/system/node/nodeX/memory_side_cache/indexY/write_policy

- /sys/devices/system/node/nodeX/x86/sgx_total_bytes

- /sys/devices/system/node/nodeX/memory_failure/total

- /sys/devices/system/node/nodeX/memory_failure/ignored

- /sys/devices/system/node/nodeX/memory_failure/failed

- /sys/devices/system/node/nodeX/memory_failure/delayed

- /sys/devices/system/node/nodeX/memory_failure/recovered

## File stable/sysfs-devices-system-cpu

Has the following ABI:

- /sys/devices/system/cpu/dscr_default

- /sys/devices/system/cpu/cpu[0-9]+/dscr

- /sys/devices/system/cpu/cpuX/topology/physical_package_id

- /sys/devices/system/cpu/cpuX/topology/die_id

- /sys/devices/system/cpu/cpuX/topology/core_id

- /sys/devices/system/cpu/cpuX/topology/cluster_id

- /sys/devices/system/cpu/cpuX/topology/book_id

- /sys/devices/system/cpu/cpuX/topology/drawer_id

- /sys/devices/system/cpu/cpuX/topology/core_cpus

- /sys/devices/system/cpu/cpuX/topology/core_cpus_list

- /sys/devices/system/cpu/cpuX/topology/package_cpus

- /sys/devices/system/cpu/cpuX/topology/package_cpus_list

- /sys/devices/system/cpu/cpuX/topology/die_cpus

- /sys/devices/system/cpu/cpuX/topology/ppin

- /sys/devices/system/cpu/cpuX/topology/die_cpus_list

- /sys/devices/system/cpu/cpuX/topology/cluster_cpus

- /sys/devices/system/cpu/cpuX/topology/cluster_cpus_list

- /sys/devices/system/cpu/cpuX/topology/book_siblings

- /sys/devices/system/cpu/cpuX/topology/book_siblings_list

- /sys/devices/system/cpu/cpuX/topology/drawer_siblings

- /sys/devices/system/cpu/cpuX/topology/drawer_siblings_list

## File stable/sysfs-devices-system-xen_memory

Has the following ABI:

- /sys/devices/system/xen_memory/xen_memory0/max_retry_count

- /sys/devices/system/xen_memory/xen_memory0/max_schedule_delay

- /sys/devices/system/xen_memory/xen_memory0/retry_count

- /sys/devices/system/xen_memory/xen_memory0/schedule_delay

- /sys/devices/system/xen_memory/xen_memory0/target

- /sys/devices/system/xen_memory/xen_memory0/target_kb

- /sys/devices/system/xen_memory/xen_memory0/info/current_kb

- /sys/devices/system/xen_memory/xen_memory0/info/high_kb

- /sys/devices/system/xen_memory/xen_memory0/info/low_kb

- /sys/devices/system/xen_memory/xen_memory0/scrub_pages

## File stable/sysfs-driver-aspeed-vuart

Has the following ABI:

- /sys/bus/platform/drivers/aspeed-vuart/*/lpc_address

- /sys/bus/platform/drivers/aspeed-vuart/*/sirq

- /sys/bus/platform/drivers/aspeed-vuart/*/sirq_polarity

## File stable/sysfs-driver-dma-idxd

Has the following ABI:

- /sys/bus/dsa/devices/dsa<m>/version

- /sys/bus/dsa/devices/dsa<m>/cdev_major

- /sys/bus/dsa/devices/dsa<m>/errors

- /sys/bus/dsa/devices/dsa<m>/max_batch_size

- /sys/bus/dsa/devices/dsa<m>/max_work_queues_size

- /sys/bus/dsa/devices/dsa<m>/max_engines

- /sys/bus/dsa/devices/dsa<m>/max_groups

- /sys/bus/dsa/devices/dsa<m>/max_read_buffers

- /sys/bus/dsa/devices/dsa<m>/max_transfer_size

- /sys/bus/dsa/devices/dsa<m>/max_work_queues

- /sys/bus/dsa/devices/dsa<m>/numa_node

- /sys/bus/dsa/devices/dsa<m>/op_cap

- /sys/bus/dsa/devices/dsa<m>/pasid_enabled

- /sys/bus/dsa/devices/dsa<m>/state

- /sys/bus/dsa/devices/dsa<m>/group<m>.<n>

- /sys/bus/dsa/devices/dsa<m>/engine<m>.<n>

- /sys/bus/dsa/devices/dsa<m>/wq<m>.<n>

- /sys/bus/dsa/devices/dsa<m>/configurable

- /sys/bus/dsa/devices/dsa<m>/read_buffer_limit

- /sys/bus/dsa/devices/dsa<m>/cmd_status

- /sys/bus/dsa/devices/dsa<m>/iaa_cap

- /sys/bus/dsa/devices/dsa<m>/event_log_size

- /sys/bus/dsa/devices/wq<m>.<n>/block_on_fault

- /sys/bus/dsa/devices/wq<m>.<n>/group_id

- /sys/bus/dsa/devices/wq<m>.<n>/size

- /sys/bus/dsa/devices/wq<m>.<n>/type

- /sys/bus/dsa/devices/wq<m>.<n>/cdev_minor

- /sys/bus/dsa/devices/wq<m>.<n>/mode

- /sys/bus/dsa/devices/wq<m>.<n>/priority

- /sys/bus/dsa/devices/wq<m>.<n>/state

- /sys/bus/dsa/devices/wq<m>.<n>/threshold

- /sys/bus/dsa/devices/wq<m>.<n>/max_transfer_size

- /sys/bus/dsa/devices/wq<m>.<n>/max_batch_size

- /sys/bus/dsa/devices/wq<m>.<n>/ats_disable

- /sys/bus/dsa/devices/wq<m>.<n>/prs_disable

- /sys/bus/dsa/devices/wq<m>.<n>/occupancy

- /sys/bus/dsa/devices/wq<m>.<n>/enqcmds_retries

- /sys/bus/dsa/devices/wq<m>.<n>/op_config

- /sys/bus/dsa/devices/wq<m>.<n>/driver_name

- /sys/bus/dsa/devices/engine<m>.<n>/group_id

- /sys/bus/dsa/devices/group<m>.<n>/use_read_buffer_limit

- /sys/bus/dsa/devices/group<m>.<n>/read_buffers_allowed

- /sys/bus/dsa/devices/group<m>.<n>/read_buffers_reserved

- /sys/bus/dsa/devices/group<m>.<n>/desc_progress_limit

- /sys/bus/dsa/devices/group<m>.<n>/batch_progress_limit

- /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_faults

- /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_fault_failures

- /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/pid

## File stable/sysfs-driver-dma-ioatdma

Has the following ABI:

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/cap

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_active

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/ring_size

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/version

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/dma/dma<n>chan<n>/quickdata/intr_coalesce

## File stable/sysfs-driver-firmware-zynqmp

Has the following ABI:

- /sys/devices/platform/firmware\:zynqmp-firmware/ggs*

- /sys/devices/platform/firmware\:zynqmp-firmware/pggs*

- /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope

- /sys/devices/platform/firmware\:zynqmp-firmware/health_status

- /sys/devices/platform/firmware\:zynqmp-firmware/feature_config_id

- /sys/devices/platform/firmware\:zynqmp-firmware/feature_config_value

## File stable/sysfs-driver-ib_srp

Has the following ABI:

- /sys/class/infiniband_srp/srp-<hca>-<port_number>/add_target

- /sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev

- /sys/class/infiniband_srp/srp-<hca>-<port_number>/port

- /sys/class/scsi_host/host<n>/allow_ext_sg

- /sys/class/scsi_host/host<n>/ch_count

- /sys/class/scsi_host/host<n>/cmd_sg_entries

- /sys/class/scsi_host/host<n>/comp_vector

- /sys/class/scsi_host/host<n>/dgid

- /sys/class/scsi_host/host<n>/id_ext

- /sys/class/scsi_host/host<n>/ioc_guid

- /sys/class/scsi_host/host<n>/local_ib_device

- /sys/class/scsi_host/host<n>/local_ib_port

- /sys/class/scsi_host/host<n>/orig_dgid

- /sys/class/scsi_host/host<n>/pkey

- /sys/class/scsi_host/host<n>/req_lim

- /sys/class/scsi_host/host<n>/service_id

- /sys/class/scsi_host/host<n>/sgid

- /sys/class/scsi_host/host<n>/zero_req_lim

## File stable/sysfs-driver-misc-cp500

Has the following ABI:

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/0000:XX:XX.X/version

- /sys/devices/pciXXXX:XX/0000:XX:XX.X/0000:XX:XX.X/keep_cfg

## File stable/sysfs-driver-mlxreg-io

Has the following ABI:

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_health

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/fan_dir

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/jtag_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/select_iio

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu1_on

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_aux_pwr_or_ref

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_asic_thermal

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_hotswap_or_halt

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_hotswap_or_wd

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_fw_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_long_pb

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_main_pwr_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_short_pb

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sw_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_pwr_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_from_comex

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_system

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_voltmon_upgrade_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_thermal

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_comex_wd

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_from_asic

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_reload_bios

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sff_wd

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_swb_wd

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config1

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config2

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_ac_pwr_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_platform

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_soc

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_sw_pwr_off

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pcie_asic_reset_dis

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/vpd_wp

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/voltreg_update_status

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/ufm_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_pn

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_pn

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_pn

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_pn

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld1_version_min

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld2_version_min

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld3_version_min

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld4_version_min

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_active_image

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_auth_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/bios_upgrade_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_enable

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_pwr

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc1_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc2_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc3_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc4_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc5_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc6_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc7_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lc8_rst_mask

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/os_started

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pm_mgmt_en

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu3_on

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/psu4_on

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/shutdown_unlock

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_pn

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_version

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld1_version_min

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_pn

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_version

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga1_version_min

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/vpd_wp

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_aux_pwr_or_ref

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_dc_dc_pwr_fail

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_fpga_not_done

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_from_chassis

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_line_card

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/reset_pwr_off_from_chassis

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/cpld_upgrade_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga_upgrade_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/qsfp_pwr_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/pwr_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/agb_spi_burn_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/fpga_spi_burn_en

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/max_power

- /sys/devices/platform/mlxplat/i2c_mlxcpld.*/i2c-*/i2c-*/i2c-*/*-0032/mlxreg-io.*/hwmon/hwmon*/config

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/phy_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/mac_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/qsfp_pwr_good

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic2_health

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic2_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/comm_chnl_ready

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/config3

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_pwr_converter_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_ap_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_ap_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_recovery

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_recovery

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_reset

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot1_wp

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/erot2_wp

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/spi_chnl_select

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/asic_pg_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd1_boot_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd2_boot_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/clk_brd_prog_en

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/pwr_converter_prog_en

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_ac_ok_fail

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_pn

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_version

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/cpld5_version_min

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/jtag_cap

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/lid_open

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_long_pwr_pb

- /sys/devices/platform/mlxplat/mlxreg-io/hwmon/hwmon*/reset_swb_dc_dc_pwr_fail

## File stable/sysfs-driver-qla2xxx

Has the following ABI:

- /sys/bus/pci/drivers/qla2xxx/.../devices/*

## File stable/sysfs-driver-speakup

Has the following ABI:

- /sys/accessibility/speakup/attrib_bleep

- /sys/accessibility/speakup/bell_pos

- /sys/accessibility/speakup/bleeps

- /sys/accessibility/speakup/bleep_time

- /sys/accessibility/speakup/cursor_time

- /sys/accessibility/speakup/cur_phonetic

- /sys/accessibility/speakup/delimiters

- /sys/accessibility/speakup/ex_num

- /sys/accessibility/speakup/key_echo

- /sys/accessibility/speakup/keymap

- /sys/accessibility/speakup/no_interrupt

- /sys/accessibility/speakup/punc_all

- /sys/accessibility/speakup/punc_level

- /sys/accessibility/speakup/punc_most

- /sys/accessibility/speakup/punc_some

- /sys/accessibility/speakup/reading_punc

- /sys/accessibility/speakup/repeats

- /sys/accessibility/speakup/say_control

- /sys/accessibility/speakup/say_word_ctl

- /sys/accessibility/speakup/silent

- /sys/accessibility/speakup/spell_delay

- /sys/accessibility/speakup/synth

- /sys/accessibility/speakup/synth_direct

- /sys/accessibility/speakup/version

- /sys/accessibility/speakup/i18n/announcements

- /sys/accessibility/speakup/i18n/chartab

- /sys/accessibility/speakup/i18n/ctl_keys

- /sys/accessibility/speakup/i18n/function_names

- /sys/accessibility/speakup/i18n/states

- /sys/accessibility/speakup/i18n/characters

- /sys/accessibility/speakup/i18n/colors

- /sys/accessibility/speakup/i18n/formatted

- /sys/accessibility/speakup/i18n/key_names

- /sys/accessibility/speakup/<synth-name>/

- /sys/accessibility/speakup/<synth-name>/caps_start

- /sys/accessibility/speakup/<synth-name>/caps_stop

- /sys/accessibility/speakup/<synth-name>/delay_time

- /sys/accessibility/speakup/<synth-name>/direct

- /sys/accessibility/speakup/<synth-name>/freq

- /sys/accessibility/speakup/<synth-name>/flush_time

- /sys/accessibility/speakup/<synth-name>/full_time

- /sys/accessibility/speakup/<synth-name>/jiffy_delta

- /sys/accessibility/speakup/<synth-name>/pitch

- /sys/accessibility/speakup/<synth-name>/inflection

- /sys/accessibility/speakup/<synth-name>/punct

- /sys/accessibility/speakup/<synth-name>/rate

- /sys/accessibility/speakup/<synth-name>/tone

- /sys/accessibility/speakup/<synth-name>/trigger_time

- /sys/accessibility/speakup/<synth-name>/voice

- /sys/accessibility/speakup/<synth-name>/vol

## File stable/sysfs-driver-usb-usbtmc

Has the following ABI:

- /sys/bus/usb/drivers/usbtmc/*/interface_capabilities

- /sys/bus/usb/drivers/usbtmc/*/device_capabilities

- /sys/bus/usb/drivers/usbtmc/*/usb488_interface_capabilities

- /sys/bus/usb/drivers/usbtmc/*/usb488_device_capabilities

## File stable/sysfs-driver-w1_ds2438

Has the following ABI:

- /sys/bus/w1/devices/.../page1

- /sys/bus/w1/devices/.../offset

## File stable/sysfs-driver-w1_ds28e04

Has the following ABI:

- /sys/bus/w1/devices/.../pio

- /sys/bus/w1/devices/.../eeprom

## File stable/sysfs-driver-w1_ds28ea00

Has the following ABI:

- /sys/bus/w1/devices/.../w1_seq

## File stable/sysfs-firmware-opal-dump

Has the following ABI:

- /sys/firmware/opal/dump

## File stable/sysfs-firmware-opal-elog

Has the following ABI:

- /sys/firmware/opal/elog

## File stable/sysfs-fs-orangefs

Has the following ABI:

- /sys/fs/orangefs/perf_counters/*

- /sys/fs/orangefs/perf_counter_reset

- /sys/fs/orangefs/perf_time_interval_secs

- /sys/fs/orangefs/perf_history_size

- /sys/fs/orangefs/op_timeout_secs

- /sys/fs/orangefs/slot_timeout_secs

- /sys/fs/orangefs/acache/*

- /sys/fs/orangefs/ncache/*

- /sys/fs/orangefs/capcache/*

- /sys/fs/orangefs/ccache/*

## File stable/sysfs-hypervisor-xen

Has the following ABI:

- /sys/hypervisor/compilation/compile_date

- /sys/hypervisor/compilation/compiled_by

- /sys/hypervisor/compilation/compiler

- /sys/hypervisor/properties/capabilities

- /sys/hypervisor/properties/changeset

- /sys/hypervisor/properties/features

- /sys/hypervisor/properties/pagesize

- /sys/hypervisor/properties/virtual_start

- /sys/hypervisor/type

- /sys/hypervisor/uuid

- /sys/hypervisor/version/extra

- /sys/hypervisor/version/major

- /sys/hypervisor/version/minor

- /sys/hypervisor/start_flags/*

## File stable/sysfs-kernel-notes

Has the following ABI:

- /sys/kernel/notes

## File stable/sysfs-module

The /sys/module tree consists of the following structure:

Has the following ABI:

- /sys/module/<MODULENAME>

- /sys/module/<MODULENAME>/parameters

- /sys/module/<MODULENAME>/refcnt

- /sys/module/<MODULENAME>/srcversion

- /sys/module/<MODULENAME>/version

## File stable/sysfs-platform-wmi-bmof

Has the following ABI:

- /sys/bus/wmi/devices/05901221-D566-11D1-B2F0-00A0C9062910[-X]/bmof

## File stable/sysfs-transport-srp

Has the following ABI:

- /sys/class/srp_remote_ports/port-<h>:<n>/delete

- /sys/class/srp_remote_ports/port-<h>:<n>/dev_loss_tmo

- /sys/class/srp_remote_ports/port-<h>:<n>/fast_io_fail_tmo

- /sys/class/srp_remote_ports/port-<h>:<n>/port_id

- /sys/class/srp_remote_ports/port-<h>:<n>/reconnect_delay

- /sys/class/srp_remote_ports/port-<h>:<n>/roles

- /sys/class/srp_remote_ports/port-<h>:<n>/state

## File stable/thermal-notification

Has the following ABI:

- A notification mechanism for thermal related events

## File stable/vdso

Has the following ABI:

- vDSO