linux-kernel - Re: one more apic merging preliminary series

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Message-ID: <20080818203726.GB1152@linux-os.sc.intel.com>
Date:	Mon, 18 Aug 2008 13:37:27 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"macro@...ux-mips.org" <macro@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: one more apic merging preliminary series

On Sun, Aug 17, 2008 at 05:45:40AM -0700, Ingo Molnar wrote:
> 
> * Cyrill Gorcunov <gorcunov@...il.com> wrote:
> 
> > Please review - any comments are welcome!
> >
> > For now it's like code bloating - but it's just preliminary series to
> > make apic_*.c code more or less similar. And it's still a bit far from
> > being ready to be merged down.
> 
> applied to tip/x86/apic - thanks Cyrill.
> 
> Maciej's point about cleaning up the x2apic impact is very much true -
> i've Cc:-ed Suresh and Venki. Even if we wont truly use x2apic in 32-bit
> kernels, it's a piece of glue hardware that does not depend on which
> mode the CPU is in, so support for it should be bitsize agnostic. It
> will also obviously be good for test coverage, once x2apic capable hw
> will be more widespread.

Interrupt-remapping(part of chipset) must be enabled before enabling/using
x2apic mode.

So, there is little bit more work (adding the intr-remapping pieces to 32bit
kernel etc) to be done, before enabling x2apic for 32-bit kernel aswell.

I am planning to do some work (introduce some kind of interrupt-remapping ops
and cleanup some of the code in the existing io_apic_64.c), that will
eventually make it easy to add interrupt-remapping and x2apic to 32bit aswell.

thanks,
suresh
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