pci powerstate related: aac(4) broken on Perc 3/Di on -CURRENT

[Simon L. Nielsen]

On 2004.12.23 07:48:44 -0700, Scott Long wrote:
> 
> Simon L. Nielsen wrote:
> >Hello
> >
> >Recent -CURRENT seems to have broken aac(4) on a Dell Perc 4/Di.  The
> >system is a Dell PowerEdge 2650 with 4 36GB IBM disks in a RAID0+1
> >configuration.
> >
> >It runs fine on a 5-STABLE kernel, but when booting -CURRENT it prints
> >a lot of errors from the RAID controller and then fails to mount the
> >root file-system.
> >
> >I have attached dmesg from 6-CURRENT and 5-STABLE, but the main
> >interesting parts from -CURRENT are:
> >
> >aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1 on 
> >pci4
> >aac0: [FAST]
> >aacd0: <RAID 0/1> on aac0
> >aacd0: 69425MB (142182912 sectors)
> >SMP: AP CPU #3 Launched!
> >SMP: AP CPU #1 Launched!
> >SMP: AP CPU #2 Launched!
> >aac0: **Monitor**         NMI ISR: NMI_SECONDARY_ATU_ERROR
> >aac0: **Monitor**         NMI ISR: NMI_SECONDARY_ATU_ERROR
> >aac0: COMMAND 0xc2409438 TIMEOUT AFTER 41 SECONDS
> 
> There are very few differences between the driver in 6-CURRENT and
> 5-STABLE, and none of the differences look like ones that could
> cause problems.  Would you get able to step the source backwards until
> you find the point where it starts working again?

After several rounds of backstepping I found that the problem is
caused by sys/dev/pci/pci.c v. 1.268 which sets hw.pci.do_powerstate=1
by default.  If I add hw.pci.do_powerstate="0" to loader.conf the
system boots fine.  I have no idea why this only manifests itself as
an aac(4) error.

This system has a Dell remote management card and I rememeber that
Lukas Ertl, some time ago, reported some problem with the power state
change and a (HP?) remote management card, so perhaps this is a
similar issue.

-- 
Simon L. Nielsen
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