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

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Date:   Tue, 10 Nov 2020 08:55:25 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, David Woodhouse <dwmw@...zon.co.uk>,
        x86 <x86@...nel.org>, Qian Cai <cai@...hat.com>
Subject: Re: [tip: x86/apic] x86/io_apic: Cleanup trigger/polarity helpers

On 11/10/20 8:34 AM, Thomas Gleixner wrote:
> On Tue, Nov 10 2020 at 07:10, Borislav Petkov wrote:
> 
>> On Mon, Nov 09, 2020 at 05:15:03PM -0600, Tom Lendacky wrote:
>>> [  105.325371] hpet: Lost 9601 RTC interrupts
>>> [  105.485766] hpet: Lost 9600 RTC interrupts
>>> [  105.639182] hpet: Lost 9601 RTC interrupts
>>> [  105.792155] hpet: Lost 9601 RTC interrupts
>>> [  105.947076] hpet: Lost 9601 RTC interrupts
>>> [  106.100876] hpet: Lost 9600 RTC interrupts
>>> [  106.253444] hpet: Lost 9601 RTC interrupts
>>> [  106.406722] hpet: Lost 9601 RTC interrupts
>>>
>>> preventing the system from booting. I bisected it to this commit.
>>
>> I bisected it to the exact same thing too, on an AMD laptop, after seeing what
>> you're seeing.
> 
> Bah. I'm a moron.
> 
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -809,9 +809,9 @@ static bool irq_is_level(int idx)
>  	case MP_IRQTRIG_DEFAULT:
>  		/*
>  		 * Conforms to spec, ie. bus-type dependent trigger
> -		 * mode. PCI defaults to egde, ISA to level.
> +		 * mode. PCI defaults to level, ISA to edge.
>  		 */
> -		level = test_bit(bus, mp_bus_not_pci);
> +		level = !test_bit(bus, mp_bus_not_pci);
>  		/* Take EISA into account */
>  		return eisa_irq_is_level(idx, bus, level);
>  	case MP_IRQTRIG_EDGE:
> 

I was about to send the dmesg output when I saw this. A quick test with
this change resolves the boot issue, thanks!

I'm still seeing the warning at arch/x86/kernel/apic/apic.c:2527, but I'll
start a separate thread on that.

Thanks,
Tom