A problem about interrupt when booting a captured kernel
AKASHI Takahiro
takahiro.akashi at linaro.org
Wed Nov 18 00:03:37 PST 2015
On 11/17/2015 06:07 PM, Marc Zyngier wrote:
> On Tue, 17 Nov 2015 10:05:23 +0900
> AKASHI Takahiro <takahiro.akashi at linaro.org> wrote:
>
>> Marc,
>> (Cc: Mark)
>>
>> On 11/17/2015 04:26 AM, Marc Zyngier wrote:
>>> On 13/11/15 10:09, Yang Yingliang wrote:
>>>> Hi, Marc
>>>>
>>>>
>>>> The kexec will boot a captured kernel while the kernel panic. But
>>>> it boots failed if the kernel panic in handler function of PPI. The
>>>> reason is that the PPI has not been 'eoi', other interrupts can not be
>>>> handled when booting the captured kernel.
>>>>
>>>> The kexec will call irq_eoi to end the irqs that have
>>>> IRQD_IRQ_INPROGRESS flag. But PPIs don't have this flag, so it won't be
>>>> ended.
>>>>
>>>> Three ways to solve this problem we can think :
>>>> 1. Is there a way to reset gic like its_reset ?
>>>> 2. Can we add some flag for calling irq_eoi ?
>>>> 3. Just 'eoi' all PPIs without checking flags in kexec.
>>>>
>>>> Please give some advice.
>>>
>>> Good timing. Please see:
>>>
>>> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-November/385383.html
>>
>> I removed machine_kexec_mask_interrupts() from my arm64 kdump patch series[1]
>> due to the past discussions[2].
>>
>> Is it the time that I should resurrect the code?
>
> Probably.
Let me make sure.
Have your patches here, especially #1, also addressed the issue that you pointed out
in [1]?
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-April/338969.html
-Takahiro AKASHI
> Thanks,
>
> M.
>
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