linux-kernel - Re: [PATCH] x86: add apic probe for genapic 64bit v2

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Date:	Tue, 22 Jul 2008 01:09:43 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>, "Paul Jackson" <pj@....com>,
	"Mike Travis" <travis@....com>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Suresh Siddha" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: add apic probe for genapic 64bit v2

On Tue, Jul 22, 2008 at 12:13 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>> > v2: fix compiling when CONFIG_ACPI is not set
>>
>> applied to tip/x86/x2apic - thanks Yinghai.
>>
>> > +static struct genapic *apic_probe[] __initdata = {
>> > +   &apic_x2apic_uv_x,
>> > +   &apic_x2apic_phys,
>> > +   &apic_x2apic_cluster,
>> > +   &apic_physflat,
>> > +   NULL,
>> > +};
>>
>> very nice generalization!
>
> btw.:
>
>   apic_probe[i]->acpi_madt_oem_check
>
> should probably be renamed to something more neutral like "->probe" -
> there's nothing ACPI about it and some weird boxes could use PCI or
> other probing mechanisms to discover the type of APIC they want to use.

32bit has acpi_madt_oem_check and mps_oem_check
64bit should only have acpi_madt_oem_check

>
> plus i guess genapic_32.h and genapic_64.h should be unified and struct
> apic_ops should be put into struct genapic?

yes.

hope to call acpi_madt_oem_check and mps_oem_check right after
acpi_boot_table_init
to decide apic_ops and genapic as early as possible.


Jack/Mike,
does your big box support SRAT? it seems it calling is_uv_system
before acpi_madt_oem_check is called.
I like to call early_acpi_boot_init, before acpi_numa_init so
acpi_madt_oem_check is called before srat is used. can you check
attached patch on your system?

YH

View attachment "early_madt_oem_check.patch" of type "text/x-patch" (755 bytes)