How to Listing PCI Devices

Many devices such as network and video cards are attached to the PCI bus. It is important that the operating system load the correct driver for each device so that the proper device settings are configured. For example, if your server contains a Gigabit network card connected to a Gigabit network switch, you can use a few simple Linux utilities to verify and, if necessary, change the transfer rate of the NIC.

To list all the PCI buses on the system and all the devices attached to them, use the lspci utility from the pciutils package. Install this package via Red Hat Network.

If run with no command-line options, the output includes one line per PCI device with basic information such as the vendor and product name as shown

Sample lspci Output

00:00.0 Host bridge: Intel Corporation 82975X Memory Controller Hub

00:01.0 PCI bridge: Intel Corporation 82975X PCI Express Root Port

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)

00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)

00:1c.4 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI Express Port 5 (rev 01)

00:1c.5 PCI bridge: Intel Corporation 82801GR/GH/GHM (ICH7 Family) PCI Express Port 6 (rev 01)

00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 01)

00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 01)

00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 01)

00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 01)

00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)

00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)

00:1f.0 ISA bridge: Intel Corporation 82801GH (ICH7DH) LPC Interface Bridge (rev ➥01)

00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev ➥01)

00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) Serial ATA Storage Controller IDE (rev 01)

00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01)

01:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7600 GT] (rev ➥a1)

04:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller

05:04.0 FireWire (IEEE 1394): Texas Instruments TSB43AB23 IEEE-1394a-2000 ➥Controller (PHY/Link)

05:05.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)

To display more verbose information about the devices such as the amount of internal memory, use the command lspci -v.

Verbose lpsci Output

05:05.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)

Subsystem: Intel Corporation Unknown device 7114

Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 17

I/O ports at 1018 [size=8]

I/O ports at 1024 [size=4]

I/O ports at 1010 [size=8]

I/O ports at 1020 [size=4]

I/O ports at 1000 [size=16]

Memory at 92004800 (32-bit, non-prefetchable) [size=1K]

Expansion ROM at fff80000 [disabled] [size=512K]

Capabilities: [60] Power Management version 2

To display everything the system knows about the devices, use the command lspci -vv.

Even More Verbose lspci Output

05:05.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid]

Serial ATA Controller (rev 02)

Subsystem: Intel Corporation Unknown device 7114

Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-

Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-

Latency: 32, Cache Line Size: 64 bytes

Interrupt: pin A routed to IRQ 17

Region 0: I/O ports at 1018 [size=8]

Region 1: I/O ports at 1024 [size=4]

Region 2: I/O ports at 1010 [size=8]

Region 3: I/O ports at 1020 [size=4]

Region 4: I/O ports at 1000 [size=16]

Region 5: Memory at 92004800 (32-bit, non-prefetchable) [size=1K]

Expansion ROM at fff80000 [disabled] [size=512K]

Capabilities: [60] Power Management version 2

Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA

PME(D0-,D1-,D2-,D3hot-,D3cold-)

Status: D0 PME-Enable- DSel=0 DScale=2 PME-

The lspci utility works by probing the device for its PCI ID. Then, this ID number is cross-referenced with the /usr/share/hwdata/pci.ids file from the hwdata package. This file contains the vendor, device, subvendor, subdevice, and class identifiers for all known PCI IDs.