Re: [RFT Part2 v2 00/24] Enable hierarchy irqdomian on x86 platforms

[Aravind Gopalakrishnan]

On 9/26/2014 9:29 AM, Borislav Petkov wrote:
> On Fri, Sep 26, 2014 at 10:02:01PM +0800, Jiang Liu wrote:
> > We plan to restructure x86 interrupt code based on hierarchy irqdomain,
> > that is to build irqdomains for CPU vector, interrupt remapping unit,
> > IOAPIC, MSI and HPET etc and organize those irqdomains in hierarchy mode.
> > Each irqdomain manages corresponding interrupt controller and talks to
> > parent interrupt controller through public irqdomain interfaces. We also
> > support stacked irq_chip based on hierarchy irqdomain. It will make the
> > x86 interrupt architecture much more clear and more easy to maintain
> > with hierarchy irqdomain and stacked irq_chip. It may also help ARM
> > interrupt management architecture too.
> >
> > This is the second patch set to enable support of hierarchy irqdomain
> > on x86 platforms. It depends on the first part at:
> > https://lkml.org/lkml/2014/9/26/501
> > And you may access it at:
> > https://github.com/jiangliu/linux.git irqdomain/p2v2
> >
> > And there will be a third patch set to convert IOAPIC driver to support
> > hierarchy irqdomain and clean up code.
> >
> > The first patch extends irqdomain interfaces to support hierarchy
> > irqdomain. Hope this interface could be used by other architectures too,
> > such as ARM/ARM64.
> > The second patch introduces two helper functions to support stacked
> > irq_chip.
> > Patch 3-9 implements an irqdomain to manange CPU interrupt vectors, and
> > it's the root irqdomain for x86 platforms.
> > Patch 10-13 converts Intel and AMD interrupt remapping drivers to
> > support hierarchy irqdomain.
> > Patch 14-16 converts HPET and MSI to support hierarchy irqdomain.
> > Patch 17-20 cleans up unsued code in x86 arch and interrupt remapping
> > drivers.
> > Patch 21-24 converts DMAR, HTIRQ and UV to support hierarchy irqdomain.
> >
> > We have tested this patchset on Intel 32-bit and 64-bit systems. And it
> > also passes Fengguang's 0day tests. But helps are need for testing:
> > 1) AMD interrupt remapping
> > 2) AMD HT_IRQ
> Adding Aravind.
>
> @Aravind: you might want to give that patchset a run just in case, to
> make sure it doesn't break anything on AMD. You'll need the previous
> patchset to go before too, though:
>
> https://lkml.kernel.org/r/1411738196-29958-1-git-send-email-jiang.liu@xxxxxxxxxxxxxxx

Sure, Will help testing these.

> I'm sure Jiang will help you if you have more questions.

Okay, I shall start looking into the patches and RFH as needed.

-Aravind.
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