kernel / Documentation / ABI / testing / sysfs-bus-pci

What:		/sys/bus/pci/drivers/.../bind
What:		/sys/devices/pciX/.../bind
Date:		December 2003
Contact:	[e-mail]
Description:
		Writing a device location to this file will cause
		the driver to attempt to bind to the device found at
		this location.	This is useful for overriding default
		bindings.  The format for the location is: DDDD:BB:DD.F.
		That is Domain:Bus:Device.Function and is the same as
		found in /sys/bus/pci/devices/.  For example::

		  # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/bind

		(Note: kernels before 2.6.28 may require echo -n).

What:		/sys/bus/pci/drivers/.../unbind
What:		/sys/devices/pciX/.../unbind
Date:		December 2003
Contact:	[e-mail]
Description:
		Writing a device location to this file will cause the
		driver to attempt to unbind from the device found at
		this location.	This may be useful when overriding default
		bindings.  The format for the location is: DDDD:BB:DD.F.
		That is Domain:Bus:Device.Function and is the same as
		found in /sys/bus/pci/devices/. For example::

		  # echo 0000:00:19.0 > /sys/bus/pci/drivers/foo/unbind

		(Note: kernels before 2.6.28 may require echo -n).

What:		/sys/bus/pci/drivers/.../new_id
What:		/sys/devices/pciX/.../new_id
Date:		December 2003
Contact:	[e-mail]
Description:
		Writing a device ID to this file will attempt to
		dynamically add a new device ID to a PCI device driver.
		This may allow the driver to support more hardware than
		was included in the driver's static device ID support
		table at compile time.  The format for the device ID is:
		VVVV DDDD SVVV SDDD CCCC MMMM PPPP.  That is Vendor ID,
		Device ID, Subsystem Vendor ID, Subsystem Device ID,
		Class, Class Mask, and Private Driver Data.  The Vendor ID
		and Device ID fields are required, the rest are optional.
		Upon successfully adding an ID, the driver will probe
		for the device and attempt to bind to it.  For example::

		  # echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id

What:		/sys/bus/pci/drivers/.../remove_id
What:		/sys/devices/pciX/.../remove_id
Date:		February 2009
Contact:	Chris Wright <[e-mail]>
Description:
		Writing a device ID to this file will remove an ID
		that was dynamically added via the new_id sysfs entry.
		The format for the device ID is:
		VVVV DDDD SVVV SDDD CCCC MMMM.	That is Vendor ID, Device
		ID, Subsystem Vendor ID, Subsystem Device ID, Class,
		and Class Mask.  The Vendor ID and Device ID fields are
		required, the rest are optional.  After successfully
		removing an ID, the driver will no longer support the
		device.  This is useful to ensure auto probing won't
		match the driver to the device.  For example::

		  # echo "8086 10f5" > /sys/bus/pci/drivers/foo/remove_id

What:		/sys/bus/pci/rescan
Date:		January 2009
Contact:	Linux PCI developers <[e-mail]>
Description:
		Writing a non-zero value to this attribute will
		force a rescan of all PCI buses in the system, and
		re-discover previously removed devices.

What:		/sys/bus/pci/devices/.../msi_bus
Date:		September 2014
Contact:	Linux PCI developers <[e-mail]>
Description:
		Writing a zero value to this attribute disallows MSI and
		MSI-X for any future drivers of the device.  If the device
		is a bridge, MSI and MSI-X will be disallowed for future
		drivers of all child devices under the bridge.  Drivers
		must be reloaded for the new setting to take effect.

What:		/sys/bus/pci/devices/.../msi_irqs/
Date:		September, 2011
Contact:	Neil Horman <[e-mail]>
Description:
		The /sys/devices/.../msi_irqs directory contains a variable set
		of files, with each file being named after a corresponding msi
		irq vector allocated to that device.

What:		/sys/bus/pci/devices/.../msi_irqs/<N>
Date:		September 2011
Contact:	Neil Horman <[e-mail]>
Description:
		This attribute indicates the mode that the irq vector named by
		the file is in (msi vs. msix)

What:		/sys/bus/pci/devices/.../irq
Date:		August 2021
Contact:	Linux PCI developers <[e-mail]>
Description:
		If a driver has enabled MSI (not MSI-X), "irq" contains the
		IRQ of the first MSI vector. Otherwise "irq" contains the
		IRQ of the legacy INTx interrupt.

		"irq" being set to 0 indicates that the device isn't
		capable of generating legacy INTx interrupts.

What:		/sys/bus/pci/devices/.../remove
Date:		January 2009
Contact:	Linux PCI developers <[e-mail]>
Description:
		Writing a non-zero value to this attribute will
		hot-remove the PCI device and any of its children.

What:		/sys/bus/pci/devices/.../pci_bus/.../rescan
Date:		May 2011
Contact:	Linux PCI developers <[e-mail]>
Description:
		Writing a non-zero value to this attribute will
		force a rescan of the bus and all child buses,
		and re-discover devices removed earlier from this
		part of the device tree.

What:		/sys/bus/pci/devices/.../rescan
Date:		January 2009
Contact:	Linux PCI developers <[e-mail]>
Description:
		Writing a non-zero value to this attribute will
		force a rescan of the device's parent bus and all
		child buses, and re-discover devices removed earlier
		from this part of the device tree.

What:		/sys/bus/pci/devices/.../reset_method
Date:		August 2021
Contact:	Amey Narkhede <[e-mail]>
Description:
		Some devices allow an individual function to be reset
		without affecting other functions in the same slot.

		For devices that have this support, a file named
		reset_method is present in sysfs.  Reading this file
		gives names of the supported and enabled reset methods and
		their ordering.  Writing a space-separated list of names of
		reset methods sets the reset methods and ordering to be
		used when resetting the device.  Writing an empty string
		disables the ability to reset the device.  Writing
		"default" enables all supported reset methods in the
		default ordering.

What:		/sys/bus/pci/devices/.../reset
Date:		July 2009
Contact:	Michael S. Tsirkin <[e-mail]>
Description:
		Some devices allow an individual function to be reset
		without affecting other functions in the same device.
		For devices that have this support, a file named reset
		will be present in sysfs.  Writing 1 to this file
		will perform reset.

What:		/sys/bus/pci/devices/.../reset_subordinate
Date:		October 2024
Contact:	[e-mail]
Description:
		This is visible only for bridge devices. If you want to reset
		all devices attached through the subordinate bus of a specific
		bridge device, writing 1 to this will try to do it.  This will
		affect all devices attached to the system through this bridge
		similiar to writing 1 to their individual "reset" file, so use
		with caution.

What:		/sys/bus/pci/devices/.../vpd
Date:		February 2008
Contact:	Ben Hutchings <[e-mail]>
Description:
		A file named vpd in a device directory will be a
		binary file containing the Vital Product Data for the
		device.  It should follow the VPD format defined in
		PCI Specification 2.1 or 2.2, but users should consider
		that some devices may have incorrectly formatted data.  
		If the underlying VPD has a writable section then the
		corresponding section of this file will be writable.

What:		/sys/bus/pci/devices/.../virtfn<N>
Date:		March 2009
Contact:	Yu Zhao <[e-mail]>
Description:
		This symbolic link appears when hardware supports the SR-IOV
		capability and the Physical Function driver has enabled it.
		The symbolic link points to the PCI device sysfs entry of the
		Virtual Function whose index is N (0...MaxVFs-1).

What:		/sys/bus/pci/devices/.../dep_link
Date:		March 2009
Contact:	Yu Zhao <[e-mail]>
Description:
		This symbolic link appears when hardware supports the SR-IOV
		capability and the Physical Function driver has enabled it,
		and this device has vendor specific dependencies with others.
		The symbolic link points to the PCI device sysfs entry of
		Physical Function this device depends on.

What:		/sys/bus/pci/devices/.../physfn
Date:		March 2009
Contact:	Yu Zhao <[e-mail]>
Description:
		This symbolic link appears when a device is a Virtual Function.
		The symbolic link points to the PCI device sysfs entry of the
		Physical Function this device associates with.

What:		/sys/bus/pci/devices/.../modalias
Date:		May 2005
Contact:	Greg Kroah-Hartman <[e-mail]>
Description:
		This attribute indicates the PCI ID of the device object.

		That is in the format:
		pci:vXXXXXXXXdXXXXXXXXsvXXXXXXXXsdXXXXXXXXbcXXscXXiXX,
		where:

		    - vXXXXXXXX contains the vendor ID;
		    - dXXXXXXXX contains the device ID;
		    - svXXXXXXXX contains the sub-vendor ID;
		    - sdXXXXXXXX contains the subsystem device ID;
		    - bcXX contains the device class;
		    - scXX contains the device subclass;
		    - iXX contains the device class programming interface.

What:		/sys/bus/pci/slots/.../module
Date:		June 2009
Contact:	[e-mail]
Description:
		This symbolic link points to the PCI hotplug controller driver
		module that manages the hotplug slot.

What:		/sys/bus/pci/devices/.../label
Date:		July 2010
Contact:	Narendra K <[e-mail]>, [e-mail]
Description:
		Reading this attribute will provide the firmware
		given name (SMBIOS type 41 string or ACPI _DSM string) of
		the PCI device.	The attribute will be created only
		if the firmware	has given a name to the PCI device.
		ACPI _DSM string name will be given priority if the
		system firmware provides SMBIOS type 41 string also.
Users:
		Userspace applications interested in knowing the
		firmware assigned name of the PCI device.

What:		/sys/bus/pci/devices/.../index
Date:		July 2010
Contact:	Narendra K <[e-mail]>, [e-mail]
Description:
		Reading this attribute will provide the firmware given instance
		number of the PCI device.  Depending on the platform this can
		be for example the SMBIOS type 41 device type instance or the
		user-defined ID (UID) on s390. The attribute will be created
		only if the firmware has given an instance number to the PCI
		device and that number is guaranteed to uniquely identify the
		device in the system.
Users:
		Userspace applications interested in knowing the
		firmware assigned device type instance of the PCI
		device that can help in understanding the firmware
		intended order of the PCI device.

What:		/sys/bus/pci/devices/.../acpi_index
Date:		July 2010
Contact:	Narendra K <[e-mail]>, [e-mail]
Description:
		Reading this attribute will provide the firmware
		given instance (ACPI _DSM instance number) of the PCI device.
		The attribute will be created only if the firmware has given
		an instance number to the PCI device. ACPI _DSM instance number
		will be given priority if the system firmware provides SMBIOS
		type 41 device type instance also.
Users:
		Userspace applications interested in knowing the
		firmware assigned instance number of the PCI
		device that can help in understanding the firmware
		intended order of the PCI device.

What:		/sys/bus/pci/devices/.../d3cold_allowed
Date:		July 2012
Contact:	Huang Ying <[e-mail]>
Description:
		d3cold_allowed is bit to control whether the corresponding PCI
		device can be put into D3Cold state.  If it is cleared, the
		device will never be put into D3Cold state.  If it is set, the
		device may be put into D3Cold state if other requirements are
		satisfied too.  Reading this attribute will show the current
		value of d3cold_allowed bit.  Writing this attribute will set
		the value of d3cold_allowed bit.

What:		/sys/bus/pci/devices/.../sriov_totalvfs
Date:		November 2012
Contact:	Donald Dutile <[e-mail]>
Description:
		This file appears when a physical PCIe device supports SR-IOV.
		Userspace applications can read this file to determine the
		maximum number of Virtual Functions (VFs) a PCIe physical
		function (PF) can support. Typically, this is the value reported
		in the PF's SR-IOV extended capability structure's TotalVFs
		element.  Drivers have the ability at probe time to reduce the
		value read from this file via the pci_sriov_set_totalvfs()
		function.

What:		/sys/bus/pci/devices/.../sriov_numvfs
Date:		November 2012
Contact:	Donald Dutile <[e-mail]>
Description:
		This file appears when a physical PCIe device supports SR-IOV.
		Userspace applications can read and write to this file to
		determine and control the enablement or disablement of Virtual
		Functions (VFs) on the physical function (PF). A read of this
		file will return the number of VFs that are enabled on this PF.
		A number written to this file will enable the specified
		number of VFs. A userspace application would typically read the
		file and check that the value is zero, and then write the number
		of VFs that should be enabled on the PF; the value written
		should be less than or equal to the value in the sriov_totalvfs
		file. A userspace application wanting to disable the VFs would
		write a zero to this file. The core ensures that valid values
		are written to this file, and returns errors when values are not
		valid.  For example, writing a 2 to this file when sriov_numvfs
		is not 0 and not 2 already will return an error. Writing a 10
		when the value of sriov_totalvfs is 8 will return an error.

What:		/sys/bus/pci/devices/.../driver_override
Date:		April 2014
Contact:	Alex Williamson <[e-mail]>
Description:
		This file allows the driver for a device to be specified which
		will override standard static and dynamic ID matching.  When
		specified, only a driver with a name matching the value written
		to driver_override will have an opportunity to bind to the
		device.  The override is specified by writing a string to the
		driver_override file (echo pci-stub > driver_override) and
		may be cleared with an empty string (echo > driver_override).
		This returns the device to standard matching rules binding.
		Writing to driver_override does not automatically unbind the
		device from its current driver or make any attempt to
		automatically load the specified driver.  If no driver with a
		matching name is currently loaded in the kernel, the device
		will not bind to any driver.  This also allows devices to
		opt-out of driver binding using a driver_override name such as
		"none".  Only a single driver may be specified in the override,
		there is no support for parsing delimiters.

What:		/sys/bus/pci/devices/.../numa_node
Date:		Oct 2014
Contact:	Prarit Bhargava <[e-mail]>
Description:
		This file contains the NUMA node to which the PCI device is
		attached, or -1 if the node is unknown.  The initial value
		comes from an ACPI _PXM method or a similar firmware
		source.  If that is missing or incorrect, this file can be
		written to override the node.  In that case, please report
		a firmware bug to the system vendor.  Writing to this file
		taints the kernel with TAINT_FIRMWARE_WORKAROUND, which
		reduces the supportability of your system.

What:		/sys/bus/pci/devices/.../revision
Date:		November 2016
Contact:	Emil Velikov <[e-mail]>
Description:
		This file contains the revision field of the PCI device.
		The value comes from device config space. The file is read only.

What:		/sys/bus/pci/devices/.../sriov_drivers_autoprobe
Date:		April 2017
Contact:	Bodong Wang<[e-mail]>
Description:
		This file is associated with the PF of a device that
		supports SR-IOV.  It determines whether newly-enabled VFs
		are immediately bound to a driver.  It initially contains
		1, which means the kernel automatically binds VFs to a
		compatible driver immediately after they are enabled.  If
		an application writes 0 to the file before enabling VFs,
		the kernel will not bind VFs to a driver.

		A typical use case is to write 0 to this file, then enable
		VFs, then assign the newly-created VFs to virtual machines.
		Note that changing this file does not affect already-
		enabled VFs.  In this scenario, the user must first disable
		the VFs, write 0 to sriov_drivers_autoprobe, then re-enable
		the VFs.

		This is similar to /sys/bus/pci/drivers_autoprobe, but
		affects only the VFs associated with a specific PF.

What:		/sys/bus/pci/devices/.../p2pmem/size
Date:		November 2017
Contact:	Logan Gunthorpe <[e-mail]>
Description:
		If the device has any Peer-to-Peer memory registered, this
	        file contains the total amount of memory that the device
		provides (in decimal).

What:		/sys/bus/pci/devices/.../p2pmem/available
Date:		November 2017
Contact:	Logan Gunthorpe <[e-mail]>
Description:
		If the device has any Peer-to-Peer memory registered, this
	        file contains the amount of memory that has not been
		allocated (in decimal).

What:		/sys/bus/pci/devices/.../p2pmem/published
Date:		November 2017
Contact:	Logan Gunthorpe <[e-mail]>
Description:
		If the device has any Peer-to-Peer memory registered, this
	        file contains a '1' if the memory has been published for
		use outside the driver that owns the device.

What:		/sys/bus/pci/devices/.../p2pmem/allocate
Date:		August 2022
Contact:	Logan Gunthorpe <[e-mail]>
Description:
		This file allows mapping p2pmem into userspace. For each
		mmap() call on this file, the kernel will allocate a chunk
		of Peer-to-Peer memory for use in Peer-to-Peer transactions.
		This memory can be used in O_DIRECT calls to NVMe backed
		files for Peer-to-Peer copies.

What:		/sys/bus/pci/devices/.../link/clkpm
		/sys/bus/pci/devices/.../link/l0s_aspm
		/sys/bus/pci/devices/.../link/l1_aspm
		/sys/bus/pci/devices/.../link/l1_1_aspm
		/sys/bus/pci/devices/.../link/l1_2_aspm
		/sys/bus/pci/devices/.../link/l1_1_pcipm
		/sys/bus/pci/devices/.../link/l1_2_pcipm
Date:		October 2019
Contact:	Heiner Kallweit <[e-mail]>
Description:	If ASPM is supported for an endpoint, these files can be
		used to disable or enable the individual power management
		states. Write y/1/on to enable, n/0/off to disable.

What:		/sys/bus/pci/devices/.../power_state
Date:		November 2020
Contact:	Linux PCI developers <[e-mail]>
Description:
		This file contains the current PCI power state of the device.
		The value comes from the PCI kernel device state and can be one
		of: "unknown", "error", "D0", D1", "D2", "D3hot", "D3cold".
		The file is read only.

What:		/sys/bus/pci/devices/.../sriov_vf_total_msix
Date:		January 2021
Contact:	Leon Romanovsky <[e-mail]>
Description:
		This file is associated with a SR-IOV physical function (PF).
		It contains the total number of MSI-X vectors available for
		assignment to all virtual functions (VFs) associated with PF.
		The value will be zero if the device doesn't support this
		functionality. For supported devices, the value will be
		constant and won't be changed after MSI-X vectors assignment.

What:		/sys/bus/pci/devices/.../sriov_vf_msix_count
Date:		January 2021
Contact:	Leon Romanovsky <[e-mail]>
Description:
		This file is associated with a SR-IOV virtual function (VF).
		It allows configuration of the number of MSI-X vectors for
		the VF. This allows devices that have a global pool of MSI-X
		vectors to optimally divide them between VFs based on VF usage.

		The values accepted are:
		 * > 0 - this number will be reported as the Table Size in the
			 VF's MSI-X capability
		 * < 0 - not valid
		 * = 0 - will reset to the device default value

		The file is writable if the PF is bound to a driver that
		implements ->sriov_set_msix_vec_count().

What:		/sys/bus/pci/devices/.../resourceN_resize
Date:		September 2022
Contact:	Alex Williamson <[e-mail]>
Description:
		These files provide an interface to PCIe Resizable BAR support.
		A file is created for each BAR resource (N) supported by the
		PCIe Resizable BAR extended capability of the device.  Reading
		each file exposes the bitmap of available resource sizes:

		# cat resource1_resize
		00000000000001c0

		The bitmap represents supported resource sizes for the BAR,
		where bit0 = 1MB, bit1 = 2MB, bit2 = 4MB, etc.  In the above
		example the device supports 64MB, 128MB, and 256MB BAR sizes.

		When writing the file, the user provides the bit position of
		the desired resource size, for example:

		# echo 7 > resource1_resize

		This indicates to set the size value corresponding to bit 7,
		128MB.  The resulting size is 2 ^ (bit# + 20).  This definition
		matches the PCIe specification of this capability.

		In order to make use of resource resizing, all PCI drivers must
		be unbound from the device and peer devices under the same
		parent bridge may need to be soft removed.  In the case of
		VGA devices, writing a resize value will remove low level
		console drivers from the device.  Raw users of pci-sysfs
		resourceN attributes must be terminated prior to resizing.
		Success of the resizing operation is not guaranteed.

What:		/sys/bus/pci/devices/.../leds/*:enclosure:*/brightness
What:		/sys/class/leds/*:enclosure:*/brightness
Date:		August 2024
KernelVersion:	6.12
Description:
		LED indications on PCIe storage enclosures which are controlled
		through the NPEM interface (Native PCIe Enclosure Management,
		PCIe r6.1 sec 6.28) are accessible as led class devices, both
		below /sys/class/leds and below NPEM-capable PCI devices.

		Although these led class devices could be manipulated manually,
		in practice they are typically manipulated automatically by an
		application such as ledmon(8).

		The name of a led class device is as follows:
		<bdf>:enclosure:<indication>
		where:

		- <bdf> is the domain, bus, device and function number
		  (e.g. 10000:02:05.0)
		- <indication> is a short description of the LED indication

		Valid indications per PCIe r6.1 table 6-27 are:

		- ok (drive is functioning normally)
		- locate (drive is being identified by an admin)
		- fail (drive is not functioning properly)
		- rebuild (drive is part of an array that is rebuilding)
		- pfa (drive is predicted to fail soon)
		- hotspare (drive is marked to be used as a replacement)
		- ica (drive is part of an array that is degraded)
		- ifa (drive is part of an array that is failed)
		- idt (drive is not the right type for the connector)
		- disabled (drive is disabled, removal is safe)
		- specific0 to specific7 (enclosure-specific indications)

		Broadly, the indications fall into one of these categories:

		- to signify drive state (ok, locate, fail, idt, disabled)
		- to signify drive role or state in a software RAID array
		  (rebuild, pfa, hotspare, ica, ifa)
		- to signify any other role or state (specific0 to specific7)

		Mandatory indications per PCIe r6.1 sec 7.9.19.2 comprise:
		ok, locate, fail, rebuild. All others are optional.
		A led class device is only visible if the corresponding
		indication is supported by the device.

		To manipulate the indications, write 0 (LED_OFF) or 1 (LED_ON)
		to the "brightness" file. Note that manipulating an indication
		may implicitly manipulate other indications at the vendor's
		discretion. E.g. when the user lights up the "ok" indication,
		the vendor may choose to automatically turn off the "fail"
		indication. The current state of an indication can be
		retrieved by reading its "brightness" file.

		The PCIe Base Specification allows vendors leeway to choose
		different colors or blinking patterns for the indications,
		but they typically follow the IBPI standard. E.g. the "locate"
		indication is usually presented as one or two LEDs blinking at
		4 Hz frequency:
		https://en.wikipedia.org/wiki/International_Blinking_Pattern_Interpretation

		PCI Firmware Specification r3.3 sec 4.7 defines a DSM interface
		to facilitate shared access by operating system and platform
		firmware to a device's NPEM registers. The kernel will use
		this DSM interface where available, instead of accessing NPEM
		registers directly. The DSM interface does not support the
		enclosure-specific indications "specific0" to "specific7",
		hence the corresponding led class devices are unavailable if
		the DSM interface is used.

What:		/sys/bus/pci/devices/.../doe_features
Date:		March 2025
Contact:	Linux PCI developers <[e-mail]>
Description:
		This directory contains a list of the supported Data Object
		Exchange (DOE) features. The features are the file name.
		The contents of each file is the raw Vendor ID and data
		object feature values.

		The value comes from the device and specifies the vendor and
		data object type supported. The lower (RHS of the colon) is
		the data object type in hex. The upper (LHS of the colon)
		is the vendor ID.

		As all DOE devices must support the DOE discovery feature,
		if DOE is supported you will at least see the doe_discovery
		file, with this contents:

		  # cat doe_features/doe_discovery
		  0001:00

		If the device supports other features you will see other
		files as well. For example if CMA/SPDM and secure CMA/SPDM
		are supported the doe_features directory will look like
		this:

		  # ls doe_features
		  0001:01        0001:02        doe_discovery