Quoting Grant Grundler <[email protected]>:
> On Mon, Jun 06, 2005 at 11:07:17PM -0400, Vivek Goyal wrote:
> > So even if interrupts are disabled on PCI-PCI bridge, interrupts
> generated
> > by PCI devices on secondary bus are not blocked and I hope device
> should
> > be working fine.
>
> How did you plan on disabling interrupts?
> Did you see the MSI discussion that going on now in linux-pci mailing list?
I am following the discussion now. Thanks.
I am planning to disable only leagacy shared interrupts (irq pin assertion/INTx
emulation) because shared interrupts are a problem. MSI are
not shared but I am not sure can they lead to any other problem.
>
> > But at the same time kdump kernels are not supposed to
> > do a great deal except capture and save the dump.
>
> I'd think you want to stop DMA for all devices.
> Just to prevent them from messing more with memory
> that you want to dump - ie get a consistent snapshot.
> Leaving VGA devices alone should be safe.
>
May be at some point of time.
> > Disabling interrupts at PCI level should increase the reliability of
> capturing
> > the dump on newer machines with hardware compliant with PCI 2.3 or higher.
>
>
> *lots* of PCI devices predate PCI2.3. Possibly even the majority.
Ya, Some other solution is needed for hardware predating PCI2.3. May be Eric's
suggestion of polling the hardware.
Thanks
Vivek
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