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lspci(8) The PCI Utilities lspci(8)
NAME
lspci - list all PCI devices
SYNOPSIS
lspci [options]
DESCRIPTION
lspci is a utility for displaying information about PCI buses in the system and devices
connected to them.
By default, it shows a brief list of devices. Use the options described below to request
either a more verbose output or output intended for parsing by other programs.
If you are going to report bugs in PCI device drivers or in lspci itself, please include
output of "lspci -vvx" or even better "lspci -vvxxx" (however, see below for possible
caveats).
Some parts of the output, especially in the highly verbose modes, are probably intelligi-
ble only to experienced PCI hackers. For exact definitions of the fields, please consult
either the PCI specifications or the header.h and /usr/include/linux/pci.h include files.
Access to some parts of the PCI configuration space is restricted to root on many operat-
ing systems, so the features of lspci available to normal users are limited. However,
lspci tries its best to display as much as available and mark all other information with
<access denied> text.
OPTIONS
Basic display modes
-m Dump PCI device data in a backward-compatible machine readable form. See below for
details.
-mm Dump PCI device data in a machine readable form for easy parsing by scripts. See
below for details.
-t Show a tree-like diagram containing all buses, bridges, devices and connections be-
tween them.
Display options
-v Be verbose and display detailed information about all devices.
-vv Be very verbose and display more details. This level includes everything deemed
useful.
-vvv Be even more verbose and display everything we are able to parse, even if it
doesn't look interesting at all (e.g., undefined memory regions).
-k Show kernel drivers handling each device and also kernel modules capable of han-
dling it. Turned on by default when -v is given in the normal mode of output.
(Currently works only on Linux with kernel 2.6 or newer.)
-x Show hexadecimal dump of the standard part of the configuration space (the first 64
bytes or 128 bytes for CardBus bridges).
-xxx Show hexadecimal dump of the whole PCI configuration space. It is available only to
root as several PCI devices crash when you try to read some parts of the config
space (this behavior probably doesn't violate the PCI standard, but it's at least
very stupid). However, such devices are rare, so you needn't worry much.
-xxxx Show hexadecimal dump of the extended (4096-byte) PCI configuration space available
on PCI-X 2.0 and PCI Express buses.
-b Bus-centric view. Show all IRQ numbers and addresses as seen by the cards on the
PCI bus instead of as seen by the kernel.
-D Always show PCI domain numbers. By default, lspci suppresses them on machines which
have only domain 0.
-P Identify PCI devices by path through each bridge, instead of by bus number.
-PP Identify PCI devices by path through each bridge, showing the bus number as well as
the device number.
Options to control resolving ID's to names
-n Show PCI vendor and device codes as numbers instead of looking them up in the PCI
ID list.
-nn Show PCI vendor and device codes as both numbers and names.
-q Use DNS to query the central PCI ID database if a device is not found in the local
pci.ids file. If the DNS query succeeds, the result is cached in ~/.pciids-cache
and it is recognized in subsequent runs even if -q is not given any more. Please
use this switch inside automated scripts only with caution to avoid overloading the
database servers.
-qq Same as -q, but the local cache is reset.
-Q Query the central database even for entries which are recognized locally. Use this
if you suspect that the displayed entry is wrong.
Options for selection of devices
-s [[[[<domain>]:]<bus>]:][<device>][.[<func>]]
Show only devices in the specified domain (in case your machine has several host
bridges, they can either share a common bus number space or each of them can ad-
dress a PCI domain of its own; domains are numbered from 0 to ffff), bus (0 to ff),
device (0 to 1f) and function (0 to 7). Each component of the device address can
be omitted or set to "*", both meaning "any value". All numbers are hexadecimal.
E.g., "0:" means all devices on bus 0, "0" means all functions of device 0 on any
bus, "0.3" selects third function of device 0 on all buses and ".4" shows only the
fourth function of each device.
-d [<vendor>]:[<device>][:<class>]
Show only devices with specified vendor, device and class ID. The ID's are given in
hexadecimal and may be omitted or given as "*", both meaning "any value".
Other options
-i <file>
Use <file> as the PCI ID list instead of /usr/share/misc/pci.ids.
-p <file>
Use <file> as the map of PCI ID's handled by kernel modules. By default, lspci uses
/lib/modules/kernel_version/modules.pcimap. Applies only to Linux systems with re-
cent enough module tools.
-M Invoke bus mapping mode which performs a thorough scan of all PCI devices, includ-
ing those behind misconfigured bridges, etc. This option gives meaningful results
only with a direct hardware access mode, which usually requires root privileges.
Please note that the bus mapper only scans PCI domain 0.
--version
Shows lspci version. This option should be used stand-alone.
PCI access options
The PCI utilities use the PCI library to talk to PCI devices (see pcilib(7) for details).
You can use the following options to influence its behavior:
-A <method>
The library supports a variety of methods to access the PCI hardware. By default,
it uses the first access method available, but you can use this option to override
this decision. See -A help for a list of available methods and their descriptions.
-O <param>=<value>
The behavior of the library is controlled by several named parameters. This option
allows one to set the value of any of the parameters. Use -O help for a list of
known parameters and their default values.
-H1 Use direct hardware access via Intel configuration mechanism 1. (This is a short-
hand for -A intel-conf1.)
-H2 Use direct hardware access via Intel configuration mechanism 2. (This is a short-
hand for -A intel-conf2.)
-F <file>
Instead of accessing real hardware, read the list of devices and values of their
configuration registers from the given file produced by an earlier run of lspci -x.
This is very useful for analysis of user-supplied bug reports, because you can dis-
play the hardware configuration in any way you want without disturbing the user
with requests for more dumps.
-G Increase debug level of the library.
MACHINE READABLE OUTPUT
If you intend to process the output of lspci automatically, please use one of the machine-
readable output formats (-m, -vm, -vmm) described in this section. All other formats are
likely to change between versions of lspci.
All numbers are always printed in hexadecimal. If you want to process numeric ID's instead
of names, please add the -n switch.
Simple format (-m)
In the simple format, each device is described on a single line, which is formatted as pa-
rameters suitable for passing to a shell script, i.e., values separated by whitespaces,
quoted and escaped if necessary. Some of the arguments are positional: slot, class, ven-
dor name, device name, subsystem vendor name and subsystem name (the last two are empty if
the device has no subsystem); the remaining arguments are option-like:
-rrev Revision number.
-pprogif
Programming interface.
The relative order of positional arguments and options is undefined. New options can be
added in future versions, but they will always have a single argument not separated from
the option by any spaces, so they can be easily ignored if not recognized.
Verbose format (-vmm)
The verbose output is a sequence of records separated by blank lines. Each record de-
scribes a single device by a sequence of lines, each line containing a single `tag: value'
pair. The tag and the value are separated by a single tab character. Neither the records
nor the lines within a record are in any particular order. Tags are case-sensitive.
The following tags are defined:
Slot The name of the slot where the device resides ([domain:]bus:device.function). This
tag is always the first in a record.
Class Name of the class.
Vendor Name of the vendor.
Device Name of the device.
SVendor
Name of the subsystem vendor (optional).
SDevice
Name of the subsystem (optional).
PhySlot
The physical slot where the device resides (optional, Linux only).
Rev Revision number (optional).
ProgIf Programming interface (optional).
Driver Kernel driver currently handling the device (optional, Linux only).
Module Kernel module reporting that it is capable of handling the device (optional, Linux
only). Multiple lines with this tag can occur.
NUMANode
NUMA node this device is connected to (optional, Linux only).
IOMMUGroup
IOMMU group that this device is part of (optional, Linux only).
New tags can be added in future versions, so you should silently ignore any tags you don't
recognize.
Backward-compatible verbose format (-vm)
In this mode, lspci tries to be perfectly compatible with its old versions. It's almost
the same as the regular verbose format, but the Device tag is used for both the slot and
the device name, so it occurs twice in a single record. Please avoid using this format in
any new code.
FILES
/usr/share/misc/pci.ids
A list of all known PCI ID's (vendors, devices, classes and subclasses). Maintained
at https://pci-ids.ucw.cz/, use the update-pciids utility to download the most re-
cent version.
/usr/share/misc/pci.ids.gz
If lspci is compiled with support for compression, this file is tried before
pci.ids.
~/.pciids-cache
All ID's found in the DNS query mode are cached in this file.
BUGS
Sometimes, lspci is not able to decode the configuration registers completely. This usu-
ally happens when not enough documentation was available to the authors. In such cases,
it at least prints the <?> mark to signal that there is potentially something more to say.
If you know the details, patches will be of course welcome.
Access to the extended configuration space is currently supported only by the linux_sysfs
back-end.
SEE ALSO
setpci(8), pci.ids(5), update-pciids(8), pcilib(7)
AUTHOR
The PCI Utilities are maintained by Martin Mares <mj AT ucw.cz>.
pciutils-3.7.0 31 May 2020 lspci(8)
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