linux-kernel - Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup trigger/polarity helpers

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Date:   Wed, 18 Nov 2020 23:51:10 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw2@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86 <x86@...nel.org>,
        Qian Cai <cai@...hat.com>, Joerg Roedel <joro@...tes.org>
Subject: Re: [EXTERNAL] [tip: x86/apic] x86/io_apic: Cleanup trigger/polarity
 helpers

Tglx,

On 11/18/20 9:06 PM, Thomas Gleixner wrote:
> Suravee,
> 
> On Wed, Nov 18 2020 at 17:29, Suravee Suthikulpanit wrote:
>> On 11/17/20 9:00 AM, Suravee Suthikulpanit wrote:
>>
>> I might need your help debugging this issue. I'm seeing the following error:
>>
>> [   14.005937] irq 29, desc: 00000000d200500b, depth: 0, count: 0, unhandled: 0
>> [   14.006234] ->handle_irq():  00000000eab4b6eb, handle_bad_irq+0x0/0x230
>> [   14.006234] ->irq_data.chip(): 000000001cce6d6b, intcapxt_controller+0x0/0x120
>> [   14.006234] ->action(): 0000000083bfd734
>> [   14.006234] ->action->handler(): 0000000094806345, amd_iommu_int_handler+0x0/0x10
>> [   14.006234] unexpected IRQ trap at vector 1d
>>
>> Do you have any idea what might have gone wrong here?
> 
> Yes. This lacks setting up the low level flow handler. Delta patch
> below.
> 
> Thanks,
> 
>          tglx
> ---
> --- a/drivers/iommu/amd/init.c
> +++ b/drivers/iommu/amd/init.c
> @@ -2033,6 +2033,7 @@ static int intcapxt_irqdomain_alloc(stru
>   
>   		irqd->chip = &intcapxt_controller;
>   		irqd->chip_data = info->data;
> +		__irq_set_handler(i, handle_edge_irq, 0, "edge");
>   	}
>   
>   	return ret;
> 

Yes, this fixes the issue. Now I can receive the IOMMU event log interrupts for IO_PAGE_FAULT event, which is triggered 
using the injection interface via debugfs.

Thanks,
Suravee