493 lines
20 KiB
Plaintext
493 lines
20 KiB
Plaintext
What: /sys/bus/pci/drivers/.../bind
|
|
What: /sys/devices/pciX/.../bind
|
|
Date: December 2003
|
|
Contact: linux-pci@vger.kernel.org
|
|
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: linux-pci@vger.kernel.org
|
|
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: linux-pci@vger.kernel.org
|
|
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 <chrisw@sous-sol.org>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <nhorman@tuxdriver.com>
|
|
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 <nhorman@tuxdriver.com>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <ameynarkhede03@gmail.com>
|
|
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 <mst@redhat.com>
|
|
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/.../vpd
|
|
Date: February 2008
|
|
Contact: Ben Hutchings <bwh@kernel.org>
|
|
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 <yu.zhao@intel.com>
|
|
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 <yu.zhao@intel.com>
|
|
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 <yu.zhao@intel.com>
|
|
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 <gregkh@linuxfoundation.org>
|
|
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: linux-pci@vger.kernel.org
|
|
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 <narendra_k@dell.com>, linux-bugs@dell.com
|
|
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 <narendra_k@dell.com>, linux-bugs@dell.com
|
|
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 <narendra_k@dell.com>, linux-bugs@dell.com
|
|
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 <ying.huang@intel.com>
|
|
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 <ddutile@redhat.com>
|
|
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 <ddutile@redhat.com>
|
|
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 <alex.williamson@redhat.com>
|
|
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 <prarit@redhat.com>
|
|
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 <emil.l.velikov@gmail.com>
|
|
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<bodong@mellanox.com>
|
|
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 <logang@deltatee.com>
|
|
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 <logang@deltatee.com>
|
|
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 <logang@deltatee.com>
|
|
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/.../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 <hkallweit1@gmail.com>
|
|
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 <linux-pci@vger.kernel.org>
|
|
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 <leonro@nvidia.com>
|
|
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 <leonro@nvidia.com>
|
|
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 <alex.williamson@redhat.com>
|
|
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.
|