Re: Need help: how to locate failure from irq_chip subsystem

[Sai Prakash Ranjan]

On 1/18/2019 4:18 PM, Pintu Agarwal wrote:
> On Fri, Jan 18, 2019 at 3:54 PM Sai Prakash Ranjan
> <saiprakash.ranjan@xxxxxxxxxxxxxx> 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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