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From: Blue Swirl <blauwirbel@gmail.com>
Date: Sat, 16 Jan 2010 09:31:45 +0000
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Subject: [Qemu-devel] Re: sparc32 do not clear interrupts when masking
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To: Artyom Tarasenko <atar4qemu@googlemail.com>
Cc: qemu-devel@nongnu.org, Artyom Tarasenko <atar4qemu@gmail.com>

On Sat, Jan 16, 2010 at 9:10 AM, Blue Swirl <blauwirbel@gmail.com> wrote:
> On Sat, Jan 16, 2010 at 8:47 AM, Blue Swirl <blauwirbel@gmail.com> wrote:
>> On Sat, Jan 16, 2010 at 8:16 AM, Blue Swirl <blauwirbel@gmail.com> wrote=
:
>>> On Fri, Jan 15, 2010 at 10:37 PM, Artyom Tarasenko
>>> <atar4qemu@googlemail.com> wrote:
>>>> Don't clear interrupts on disabling, because
>>>> * Sun4M_SystemArchitecture_edited2.pdf doesn't describe
>>>> =C2=A0that masking or un-masking IRQ shall clear pending ones.
>>>>
>>>> * Field tests also show that SPARCstation-20 doesn't
>>>> =C2=A0clear them.
>>>
>>> Awesome work!
>>>
>>>> * The patch makes Solaris 2.5.1/2.6 boot ~1500 times
>>>> =C2=A0faster (~20 seconds instead of ~8 hours)
>>>
>>> Unfortunately there is some problem with the patch (or more likely
>>> there is some other bug that this uncovers), because all my Linux test
>>> now panic. NetBSD and OpenBSD are unaffected.
>>>
>>> For example, sparc-test:
>>> eth0: LANCE 52:54:00:12:34:56
>>> esp0: no command in esp_handle()
>>> Kernel panic - not syncing: esp_handle: current_SC =3D=3D penguin withi=
n interrupt!
>>> =C2=A0<0>Press L1-A to return to the boot prom
>>>
>>> The bug may be in ESP interrupt handling (or in the interrupt chain
>>> between ESP, DMA controller and interrupt controller) as the panic
>>> always happens in ESP probe.
>>
>> In fact the bug was that OpenBIOS didn't clear ESP interrupts after
>> issuing commands, so the IRQ line was left raised which confused
>> Linux.
>>
>
> Thanks, applied. I fixed the OpenBIOS bug and updated images in pc-bios.
>

Except that I'm idiot and commit the wrong fix.