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pcilib(7) The PCI Utilities pcilib(7)

NAME

pcilib - a library for accessing PCI devices

DESCRIPTION

The PCI library (also known as pcilib and libpci) is a portable library for accessing PCI devices and their configuration space.

ACCESS METHODS

The library supports a variety of methods to access the configuration space on different operating systems. By default, the first matching method in this list is used, but you can specify override the decision (see the -A switch of lspci).

The /sys filesystem on Linux 2.6 and newer. The standard header of the config space is available to all users, the rest only to root. Supports extended configuration space, PCI domains, VPD (from Linux 2.6.26), physical slots (also since Linux 2.6.26) and information on attached kernel drivers.
The /proc/bus/pci interface supported by Linux 2.1 and newer. The standard header of the config space is available to all users, the rest only to root.
Direct hardware access via Intel configuration mechanism 1. Available on i386 and compatibles on Linux, Solaris/x86, GNU Hurd, Windows, BeOS and Haiku. Requires root privileges.
Direct hardware access via Intel configuration mechanism 2. Available on i386 and compatibles on Linux, Solaris/x86, GNU Hurd, Windows, BeOS and Haiku. Requires root privileges. Warning: This method is able to address only the first 16 devices on any bus and it seems to be very unreliable in many cases.
Direct hardware access via Intel configuration mechanism 1 via memory-mapped I/O. Mostly used on non-i386 platforms. Requires root privileges. Warning: This method needs to be properly configured via the mmio-conf1.addrs parameter.
Direct hardware access via Extended PCIe Intel configuration mechanism 1 via memory-mapped I/O. Mostly used on non-i386 platforms. Requires root privileges. Warning: This method needs to be properly configured via the mmio-conf1-ext.addrs parameter.
The /dev/pci device on FreeBSD. Requires root privileges.
Access method used on AIX. Requires root privileges.
The /dev/pci0 device on NetBSD accessed using the local libpci library.
The /dev/pci device on OpenBSD. Requires root privileges.
Read the contents of configuration registers from a file specified in the dump.name parameter. The format corresponds to the output of lspci -x.
Access method used on Mac OS X / Darwin. Must be run as root and the system must have been booted with debug=0x144.
Device listing on Windows systems using the Windows Configuration Manager via cfgmgr32.dll system library. This method does not require any special Administrator rights or privileges. Configuration Manager provides only basic information about devices, assigned resources and device tree structure. There is no access to the PCI configuration space but libpci provides read-only virtual emulation based on information from Configuration Manager. Starting with Windows 8 (NT 6.2) it is not possible to retrieve resources from 32-bit application or library on 64-bit system.
Access to the PCI configuration space via NT SysDbg interface on Windows systems. Process needs to have Debug privilege, which local Administrators have by default. Not available on 64-bit systems and neither on recent 32-bit systems. Only devices from the first domain are accessible and only first 256 bytes of the PCI configuration space is accessible via this method.
Access to the PCI configuration space via Kernel Local Debugging Driver kldbgdrv.sys. This driver is not part of the Windows system but is part of the Microsoft WinDbg tool. It is required to have kldbgdrv.sys driver installed in the system32 directory or to have windbg.exe or kd.exe binary in PATH. kldbgdrv.sys driver has some restrictions. Process needs to have Debug privilege and Windows system has to be booted with Debugging option. Debugging option can be enabled by calling (takes effect after next boot): bcdedit /debug on
Download links for WinDbg 6.12.2.633 standalone installer from Microsoft Windows SDK for Windows 7 and .NET Framework 4:
amd64: https://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools_amd64/dbg_amd64.msi
ia64: https://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools_ia64/dbg_ia64.msi
x86: https://download.microsoft.com/download/A/6/A/A6AC035D-DA3F-4F0C-ADA4-37C8E5D34E3D/setup/WinSDKDebuggingTools/dbg_x86.msi
Archived download links of previous WinDbg versions:
https://web.archive.org/web/20110221133326/https://www.microsoft.com/whdc/devtools/debugging/installx86.mspx
https://web.archive.org/web/20110214012715/https://www.microsoft.com/whdc/devtools/debugging/install64bit.mspx

PARAMETERS

The library is controlled by several parameters. They should have sensible default values, but in case you want to do something unusual (or even something weird), you can override them (see the -O switch of lspci).

Parameters of specific access methods

Name of the bus dump file to read from.
Path to the FreeBSD PCI device.
Path to the NetBSD PCI device.
Path to the OpenBSD PCI device.
Path to the procfs bus tree.
Path to the sysfs device tree.
Path to the /dev/mem device.
Physical addresses of memory-mapped I/O ports for Intel configuration mechanism 1. CF8 (address) and CFC (data) I/O port addresses are separated by slash and multiple addresses for different PCI domains are separated by commas. Format: 0xaddr1/0xdata1,0xaddr2/0xdata2,...
Physical addresses of memory-mapped I/O ports for Extended PCIe Intel configuration mechanism 1. It has same format as mmio-conf1.addrs parameter.

Parameters for resolving of ID's via DNS

DNS domain containing the ID database.
Name of the file used for caching of resolved ID's.

Parameters for resolving of ID's via UDEV's HWDB

Disable use of HWDB if set to a non-zero value.

SEE ALSO

lspci(8), setpci(8), pci.ids(5), update-pciids(8)

AUTHOR

The PCI Utilities are maintained by Martin Mares <mj@ucw.cz>.

20 November 2022 pciutils-3.9.0