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

[Christian Brueffer]

On Wed, Apr 12, 2006 at 04:22:41PM -0700, Sam Leffler 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.
> 
> I'm not seeing issues with this code on a t41p here so there may be 
> something else that matters.
> 

I sent the debug output to Warner privately.  Basically it works when
the card is plugged in during system startup but not when I plug it in
afterwards (doesn't produce any debug messages then either).

This is the output when the card is plugged in during startup:

Status is 0x30000186
Status is 0x30000920
cbb1: card inserted: event=0x00000000, state=30000920
cbb1: cbb_power: 3V
Interrupt storm detected on "irq5:"; throttling interrupt source
cardbus1: <network, ethernet> at device 0.0 (no driver attached)
cbb1: cbb_power: 0V

- Christan

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
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