lots of "bridge window ... (disabled)" messages

lots of "bridge window ... (disabled)" messages

[Luck, Tony]

Hi Bjorn,

I just booted Linus latest git tree on my Tukwila system. I'm
seeing a lot of bridge windows marked as disabled. Here's the
start of a diff of dmesg output comparing a kernel from last
week to today's kernel (git 01e7770 vs. b72c409):

< pci 0000:00:01.0:   bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:01.0:   bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
222,224c222,224
< pci 0000:00:03.0:   bridge window [io  f000 - 0000] reg reading
< pci 0000:00:03.0:   bridge window [mem 0xfff00000 - 0x000fffff] reg reading
< pci 0000:00:03.0:   bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:03.0:   bridge window [io  0xf000-0x0000] (disabled)
> pci 0000:00:03.0:   bridge window [mem 0xfff00000-0x000fffff] (disabled)
> pci 0000:00:03.0:   bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
233c233
< pci 0000:00:05.0:   bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:05.0:   bridge window [mem 0xfff00000-0x000fffff pref] (disabled)

   ... many more such diffs.

This is the same system that you helped out with a couple of months
ago that had some issues in _CRS tables with ranges marked as
"consumer".  The BIOS team fixed the one range that was needed
to allow access to my EHCI - but they didn't touch anything else.

Are these new checks related to the same sort of issues in _CRS?
Or is this some other stuff?  I don't appear to have lost access
to any devices in today's kernel.

-Tony

Re: lots of "bridge window ... (disabled)" messages

[Bjorn Helgaas]

On Mon, 2010-03-29 at 09:57 -0700, Luck, Tony wrote:
> Hi Bjorn,
> 
> I just booted Linus latest git tree on my Tukwila system. I'm
> seeing a lot of bridge windows marked as disabled. Here's the
> start of a diff of dmesg output comparing a kernel from last
> week to today's kernel (git 01e7770 vs. b72c409):
> 
> < pci 0000:00:01.0:   bridge window [mem 0xfff00000 - 000fffff pref] reg reading
> ---
> > pci 0000:00:01.0:   bridge window [mem 0xfff00000-0x000fffff pref] (disabled)

Nothing changed here except the message.  The bridge windows are
disabled in both cases (same values in base & limit, with base > limit);
I just changed the message from "reg reading" to "(disabled)" because I
thought that would be easier to interpret.

Bjorn