interrupt routing

[John Baldwin]

On Thursday 10 February 2005 09:49 am, dima wrote:
> I am preparing a new server for production use. It is dual Opteron Tyan
> S2882 motherboard containing 2 1000BaseTX NICs and 2 SCSI controllers
> onboard. Running 5.3-RELEASE-p5 (i386). The interrupt assignment performed
> by ACPI looks kinda strange:
> $ ps -ax
> [irq24: bge0 ahd0]
> [irq25: bge1 ahd1]
> I actually want NICs and SCSI controllers run in different kernel threads.
> $ pciconf -lv
> ahd0 at pci2:6:0:  class=0x010000 card=0x005e9005 chip=0x801d9005 rev=0x10
> hdr=0x00 vendor   = 'Adaptec Inc'
>     device   = 'AIC-7902B Ultra320 SCSI Controller'
>     class    = mass storage
>     subclass = SCSI
> ahd1 at pci2:6:1:  class=0x010000 card=0x005e9005 chip=0x801d9005 rev=0x10
> hdr=0x00 vendor   = 'Adaptec Inc'
>     device   = 'AIC-7902B Ultra320 SCSI Controller'
>     class    = mass storage
>     subclass = SCSI
> bge0 at pci2:9:0:  class=0x020000 card=0x164414e4 chip=0x164814e4 rev=0x03
> hdr=0x00 vendor   = 'Broadcom Corporation'
>     device   = 'BCM5704 NetXtreme Dual Gigabit Adapter'
>     class    = network
>     subclass = ethernet
> bge1 at pci2:9:1:  class=0x020000 card=0x164414e4 chip=0x164814e4 rev=0x03
> hdr=0x00 vendor   = 'Broadcom Corporation'
>     device   = 'BCM5704 NetXtreme Dual Gigabit Adapter'
>     class    = network
>     subclass = ethernet
> All the devices are assigned IRQ10 in BIOS and I didnt found a way to
> change the settings there. I have found a year-old discussion on -current
> http://lists.freebsd.org/pipermail/freebsd-current/2004-January/019964.html
> about assigning physical IRQ lines to PCI devices; so I want to know if
> there is a way to force ACPI assign virtual interrupts a similar way.

No.  With an APIC (irqs > 16) the interrupt routing is based on how the 
devices are physically wired up.  bge0 and ahd0 are physically hooked up to 
the same pin on the motherboard and there's nothing FreeBSD can do about 
that.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org