Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci"default

From: Adam Williamson
Date: Sat Oct 26 2013 - 13:08:48 EST

On Sat, 2013-10-26 at 11:15 +0200, Ingo Molnar wrote:

> So, the best range for the breakage we have is v3.3..v3.5.

So far, yeah. I will try and narrow it down.

> As a blind shot into the dark, that turns out to be a range when a
> number of irq-remapping, vt-d changes went upstream:
> comet:~/tip> gll v3.3..v3.6 arch/x86 | grep -i remap
> 399988eea194 irq_remap: Fix compiler warning with CONFIG_IRQ_REMAP=y
> 79fec2c557cf Merge tag 'intr-remapping-ops-for-ingo' of git:// into core/iommu
> 8a8f422d3b4f iommu: rename intr_remapping.[ch] to irq_remapping.[ch]
> 95a02e976c39 iommu: rename intr_remapping references to irq_remapping
> 263b5e8629c9 x86, iommu/vt-d: Clean up interfaces for interrupt remapping
> 5e2b930b0784 iommu/vt-d: Convert MSI remapping setup to remap_ops
> 9d619f657222 iommu/vt-d: Convert free_irte into a remap_ops callback
> 4c1bad6a0af1 iommu/vt-d: Convert IR set_affinity function to remap_ops
> 0c3f173a88c4 iommu/vt-d: Convert IR ioapic-setup to use remap_ops
> 4f3d8b67ad30 iommu/vt-d: Convert missing apic.c intr-remapping call to remap_ops
> 736baef4472d iommu/vt-d: Make intr-remapping initialization generic
> f7219a5300ba x86: Introduce CONFIG_X86_DMA_REMAP
> So if you are able to test current kernels, it might be an
> additional data point to see whether the reboot delay (which appears
> to be a reboot hang on other systems) is related to the following
> kernel option:

Thanks, I'll give it a shot. Note - I suspect some of the other cases
may really be delays rather than hangs too. It's very easy to look at
the screen sitting there doing absolutely nothing at all for 30-60
seconds, lose patience, conclude it's hung, and force a shutdown/reboot.
Several of the earlier Z1 reporters on the vaio-z mailing list reported
it as a 'hang', but after I pointed out that it wasn't, confirmed the
same behaviour on their systems. This could possibly apply to others

> (CONFIG_X86_DMA_REMAP is off on Fedora.)
> IRQ_REMAP is somewhat of a dual personality feature, living half in
> arch/x86/, half in drivers/iommu/. It should normally matter for
> servers more than for laptops.
> Btw., regarding your encrypted partitions boot problem, do you have
> any non-encrypted filesystem? If yes then you could copy /[s]bin and
> /lib to it and boot via init=/bin/bash, you ought to get a minimal
> shell and be able to run /sbin/reboot.
> Thanks,
> Ingo

Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net

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