linux-kernel - Re: [Xen-devel] [PATCH v2] [Bugfix] x86/apic: Fix xen IRQ allocation failure caused by commit b81975eade8c

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Date:	Tue, 13 Jan 2015 00:18:14 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	David Vrabel <david.vrabel@...rix.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"Grant Likely" <grant.likely@...aro.org>,
	Yinghai Lu <yinghai@...nel.org>,
	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH v2] [Bugfix] x86/apic: Fix xen IRQ allocation failure caused by commit b81975eade8c


Monday, January 12, 2015, 4:01:00 PM, you wrote:

> On 12/01/15 13:39, Jiang Liu wrote:
>> Commit b81975eade8c ("x86, irq: Clean up irqdomain transition code")
>> breaks xen IRQ allocation because xen_smp_prepare_cpus() doesn't invoke
>> setup_IO_APIC(), so no irqdomains created for IOAPICs and
>> mp_map_pin_to_irq() fails at the very beginning.
>> 
>> Enhance xen_smp_prepare_cpus() to call setup_IO_APIC() to initialize
>> irqdomain for IOAPICs.

> Having Xen call setup_IO_APIC() to initialize the irq domains then having to
> add special cases to it is just wrong.

> The bits of init deferred by mp_register_apic() are also deferred to
> two different places which looks odd.

> What about something like the following (untested) patch?

Hi David / Gerry,

David's patch (after fixing a few compile issues) fixes the problem.

The power button now works for me on:
- intel baremetal
- intel xen
- amd baremetal (no issues with the override anymore)
- amd xen       (no freeze issues anymore)

Big thanks David !

--
Sander


> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 3f5f604..e180680 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -253,8 +253,10 @@ int __init arch_early_ioapic_init(void)
>         if (!nr_legacy_irqs())
>                 io_apic_irqs = ~0UL;
>  
> -       for_each_ioapic(i)
> +       for_each_ioapic(i) {
> +               BUG_ON(mp_irqdomain_create(ioapic));
>                 alloc_ioapic_saved_registers(i);
> +       }
>  
>         /*
>          * For legacy IRQ's, start with assigning irq0 to irq15 to
> @@ -2379,8 +2381,6 @@ void __init setup_IO_APIC(void)
>         io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
>  
>         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
> -       for_each_ioapic(ioapic)
> -               BUG_ON(mp_irqdomain_create(ioapic));
>  
>         /*
>           * Set up IO-APIC IRQ routing.
> @@ -2929,7 +2929,8 @@ int mp_register_ioapic(int id, u32 address, u32 gsi_base,
>         /*
>          * If mp_register_ioapic() is called during early boot stage when
>          * walking ACPI/SFI/DT tables, it's too early to create irqdomain,
> -        * we are still using bootmem allocator. So delay it to setup_IO_APIC().
> +        * we are still using bootmem allocator. So delay it to
> +        * arch_early_ioapic_init().
>          */
>         if (hotplug) {
>                 if (mp_irqdomain_create(idx)) {

>> --- a/arch/x86/kernel/apic/io_apic.c
>> +++ b/arch/x86/kernel/apic/io_apic.c
>> @@ -2369,6 +2381,15 @@ static void ioapic_destroy_irqdomain(int idx)
>>       ioapics[idx].pin_info = NULL;
>>  }
>>  
>> +static void setup_IO_APIC_IDs(void)
>> +{
>> +     if (xen_domain())
>> +             return;

> This would have to xen_pv_domain().

> David


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