linux-kernel - Re: Need help: how to locate failure from irq

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Message-ID: <1ffe2b68-c87b-aa19-08af-b811063b3310@codeaurora.org>
Date:   Fri, 18 Jan 2019 17:23:42 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Pintu Agarwal <pintu.ping@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        linux-mm@...ck.org, linux-pm@...r.kernel.org,
        kernelnewbies@...nelnewbies.org
Subject: Re: Need help: how to locate failure from irq_chip subsystem

On 1/18/2019 4:50 PM, Pintu Agarwal wrote:
>>>> Could you please tell which QCOM SoC this board is based on?
>>>>
>>>
>>> Snapdragon 845 with kernel 4.9.x
>>> I want to know from which subsystem it is triggered:drivers/soc/qcom/
>>>
>>
>> Irqchip driver is "drivers/irqchip/irq-gic-v3.c". The kernel you are
>> using is msm-4.9 I suppose or some other kernel?
>>
> Yes, I am using customized version of msm-4.9 kernel based on Android.
> And yes the irqchip driver is: irq-gic-v3, which I can see from config.
> 
> But, what I wanted to know is, how to find out which driver module
> (hopefully under: /drivers/soc/qcom/) that register with this
> irq_chip, is getting triggered at the time of crash ?
> So, that I can implement irq_hold function for it, which is the cause of crash.
> 

Hmm, since this is a bootup crash, *initcall_debug* should help.
Add "initcall_debug ignore_loglevel" to kernel commandline and
check the last log before crash.

- Sai

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