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SubjectRe: 2.6.29: can't resume from suspend with DMAR (intel iommu) enabled
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On Wed, 2009-03-25 at 19:07 +0100, Ingo Molnar wrote:
> * David Woodhouse <dwmw2@infradead.org> wrote:
>
> > On Wed, 2009-03-25 at 18:59 +0100, Ingo Molnar wrote:
> > >
> > > that's not easy - i use it right now :)
> > >
> > > That's another reason why warnings and non-panic() behavior are
> > > better for developers too. Had it not crashed i could have sent you
> > > my dmesg and i would not have turned off DMAR in the BIOS.
> > >
> > > Now it's turned off in my BIOS (first barrier) and i need to reboot
> > > the kernel (second barrier) and i need to hack up a kernel in a
> > > certain way to produce debug info (third barrier) - in the merge
> > > window (fourth barrier ;-).
> >
> > Yeah, trusting BIOS monkeys for this was always going to be a bad
> > plan. We should have just known how to set/read the damn hardware
> > BARs -- the most likely explanation for this is that your BIOS is
> > just lying to you about where it put the registers, I believe.
> >
> > I'd like to put in a basic sanity check when we first ioremap the
> > (alleged) DMAR registers. Hopefully, the output I asked for will
> > confirm that there's a simple way to do that...
>
> Could you please fix the panic() and add the debug output you'd like
> to see? That would give me a kernel to run straight away. Without me
> having to think much about what i should run and when.

That's distinctly non-trivial. I need to bail out early.

> (unless you really need this pr_debug info to proceed)
>
> But it will be some time really. The laptop has 8 days uptime and is
> not set up to run custom kernels at all.

Anyone else got a similar machine?

--
dwmw2



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