cvs commit: src/sys/dev/pccbb pccbb.c

[Christian Brueffer]

On Wed, Apr 12, 2006 at 10:33:42PM -0400, Niki Denev wrote:
> M. Warner Losh wrote:
> > In message: <20060412212843.GH1258 at haakonia.hitnet.RWTH-Aachen.DE>
> >             Christian Brueffer <brueffer at FreeBSD.org> writes:
> > : On Thu, Mar 30, 2006 at 04:25:45AM +0000, Warner Losh wrote:
> > : > imp         2006-03-30 04:25:45 UTC
> > : > 
> > : >   FreeBSD src repository
> > : > 
> > : >   Modified files:
> > : >     sys/dev/pccbb        pccbb.c 
> > : >   Log:
> > : >   On some laptops, under very high loads, the socket event register read
> > : >   in the ISR doesn't read the actual socket event register, but instead
> > : >   reads garbage (usually 0xffffffff, but other times other things).
> > : >   This totally violates the PCI spec, but happens rarely enough that a
> > : >   workaround is in order.  This adds one test when we have a real
> > : >   interrupt to service (which is very rare), and doesn't affect the
> > : >   usualy 'nothing to see here' case at all.
> > : >   
> > : >   Problem reported by many, but sam@ gave me this workaround after
> > : >   diagnosing the problem.
> > : >   
> > : 
> > : This breaks pccard/cardbus support on my Thinkpad T41p (confirmed by
> > : backing this change out).  With this change, I just get an "Interrupt
> > : storm detected on irq 5; throttling" message.
> > : 
> > : What kind of debug info can I provide?
> > 
> > A Thinkpad T41p. :-)
> > 
> > Failing that, can you set hw.cbb.debug=1 and provide me with the
> > output.
> > 
> > Warner
> 
> CURRENT from Monday here, on ThinkPad X31.
> I tested only with compact flash memory card, because it is the only
> that i have now, but on insert i get only this on the console :
> "Interrupt storm detected on "irq5:"; throttling interrupt source"
> I've set hw.cbb.debug to 1 before inserting the card but i got nothing more.
> 
> P.S.: i have the following hw.pci. tunables in boot.conf from a long
> time ago,
> i don't know if they can affect this behaviour, but i'm giving them here
> just in case :
> 
> hw.pci.do_power_nodriver=3
> hw.pci.allow_unsupported_io_range=1
> hw.pci.do_powerstate=1
> 

Good to see that someone can reproduce this.  Does it work again when
you back this change out?

- Christian

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D
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