Date: Fri, 18 Apr 2003 14:37:55 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: "Cagle, John (ISS-Houston)" <john.cagle@hp.com> Cc: freebsd-smp@freebsd.org Subject: RE: PCI devices behind bridges in APIC Full Table mode Message-ID: <XFMail.20030418143755.jhb@FreeBSD.org> In-Reply-To: <C50AB9511EE59B49B2A503CB7AE1ABD10440E4B3@cceexc19.americas.cpqcorp.net>
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On 18-Apr-2003 Cagle, John (ISS-Houston) wrote:
> With 4.8-stable, I'm having a problem with IRQ routing when a device is
> behind a PCI-to-PCI bridge in a PCI slot (like a dual-port NIC), when
> using APIC "full-table" mode. It appears that the kernel is not looking
> at the mptable to determine the proper interrupt pin routing for these
> devices.
>
> Does anyone know if FreeBSD has support for this? Can someone direct me
> to the area of the kernel to examine?
Eyuck. The APIC PCI interrupt routing is a hack in 4.x (and still is in
current as well). It is spread between sys/i386/i386/mpapic.c and this
evilness in sys/pci/pci.c:
static struct pci_devinfo *
pci_readcfg(pcicfgregs *probe)
{
...
#ifdef APIC_IO
if (cfg->intpin != 0) {
int airq;
airq = pci_apic_irq(cfg->bus, cfg->slot, cfg->intpin);
...
#endif /* APIC_IO */
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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