lkml.org 
[lkml]   [2002]   [Dec]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: /proc/pci deprecation?
On Mon, Dec 09, 2002 at 09:00:44AM -0800, Linus Torvalds wrote:

> On 9 Dec 2002, Alan Cox wrote:
> >
> > I wonder if this is why we have all these problems with VIA chipset
> > interrupt handling. According to VIA docs they _do_ use
> > PCI_INTERRUPT_LINE on integrated devices to select the IRQ routing
> > between APIC and PCI/ISA etc, as well as 0 meaning "IRQ disabled"
>
> Whee.. That sounds like a load of crock in the first place, since the
> PCI_INTERRUPT_LINE thing should be just a scratch register as far as I
> know. However, it doesn't really matter - we definitely should never write
> to it anyway, so the VIA behaviour while strange should still be
> acceptable.

I can confirm that on most builtin VIA southbridge devices (namely USB)
the register isn't just a scratch register and that indeed it is used by
the interrupt router.

> Anyway, to get back on the original discussion, I think we should remove
> the writing, and then make sure that /sbin/lspci (or some other tool) can

I guess only the irq re-routing code specific to VIA would then write
those values, because it has to if the BIOS didn't set them up correctly.

> be made to easily show either the kernel irq mapping value _or_ the
> "original PCI config space" value. At that point I'd agree that /proc/pci
> has outlived its usefulness.
>
> (Although I still think the name database is nice to have - I certainly
> prefer it over having a lot of drivers having their _own_ name databases
> for printout purposes).

It definitely made many drivers simpler.

--
Vojtech Pavlik
SuSE Labs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:31    [from the cache]
©2003-2011 Jasper Spaans