Message Signalled Interrupts Question ...

Rui Paulo rpaulo at fnop.net
Fri May 11 02:49:05 UTC 2007


At Fri, 11 May 2007 03:25:37 +0100,
Rui Paulo wrote:
> 
> At Fri, 11 May 2007 10:10:15 +0800,
> Wilkinson, Alex wrote:
> > 
> > Howdy,
> > 
> > How does one know whether their PCI device supports MSI
> > and that FreeBSD is using MSI for this device ?
> 
> You can boot with verbose mode on and the info will show up on dmesg.
> 
> For example
> found-> vendor=0x11ab, dev=0x4362, revid=0x22
>         bus=1, slot=0, func=0
>         class=02-00-00, hdrtype=0x00, mfdev=0
>         cmdreg=0x0007, statreg=0x0010, cachelnsz=64 (dwords)
>         lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
>         intpin=a, irq=11
>         powerspec 2  supports D0 D1 D2 D3  current D0
>         MSI supports 2 messages, 64 bit

Sorry, pciconf -lvc shows better information.

For example,
mskc0 at pci1:0:0: class=0x020000 card=0x532111ab chip=0x436211ab rev=0x22 hdr=0x00
    vendor     = 'Marvell Semiconductor (Was: Galileo Technology Ltd)'
    device     = 'Yukon 88E8053 PCI-E Gigabit Ethernet Controller (Copper)'
    class      = network
    subclass   = ethernet
    cap 01[48] = powerspec 2  supports D0 D1 D2 D3  current D0
    cap 03[50] = VPD
    cap 05[5c] = MSI supports 2 messages, 64 bit 
    cap 10[e0] = PCI-Express 1 legacy endpoint


--
Rui Paulo


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