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

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Message-ID: <57ff3437-47b5-fe92-d576-084ce26aa5d8@codeaurora.org>
Date:   Fri, 18 Jan 2019 16:33:38 +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 4:18 PM, Pintu Agarwal wrote:
> On Fri, Jan 18, 2019 at 3:54 PM Sai Prakash Ranjan
> <saiprakash.ranjan@...eaurora.org> wrote:
>>
>> Hi Pintu-san,
>>
>> On 1/18/2019 3:38 PM, Pintu Agarwal wrote:
>>> Hi All,
>>>
>>> Currently, I am trying to debug a boot up crash on some qualcomm
>>> snapdragon arm64 board with kernel 4.9.
>>> I could find the cause of the failure, but I am unable to locate from
>>> which subsystem/drivers this is getting triggered.
>>> If you have any ideas or suggestions to locate the issue, please let me know.
>>>
>>> This is the snapshot of crash logs:
>>> [    6.907065] Unable to handle kernel NULL pointer dereference at
>>> virtual address 00000000
>>> [    6.973938] PC is at 0x0
>>> [    6.976503] LR is at __ipipe_ack_fasteoi_irq+0x28/0x38
>>> [    7.151078] Process qmp_aop (pid: 24, stack limit = 0xfffffffbedc18000)
>>> [    7.242668] [<          (null)>]           (null)
>>> [    7.247416] [<ffffff9469f8d2e0>] __ipipe_dispatch_irq+0x78/0x340
>>> [    7.253469] [<ffffff9469e81564>] __ipipe_grab_irq+0x5c/0xd0
>>> [    7.341538] [<ffffff9469e81d68>] gic_handle_irq+0xc0/0x154
>>>
>>> [    6.288581] [PINTU]: __ipipe_ack_fasteoi_irq - called
>>> [    6.293698] [PINTU]: __ipipe_ack_fasteoi_irq:
>>> desc->irq_data.chip->irq_hold is NULL
>>>
>>> When I check, I found that the irq_hold implementation is missing in
>>> one of the irq_chip driver (expected by ipipe), which I am supposed to
>>> implement.
>>>
>>> But I am unable to locate which irq_chip driver.
>>> If there are any good techniques to locate this in kernel, please help.
>>>
>>
>> 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?

- Sai
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