Re: [RFC Patch Part1 V1 00/30] use irqdomain to dynamically allocate IRQ for IOAPIC pin

[Jiang Liu]

On 2014/5/16 23:01, Yinghai Lu wrote:
> On Fri, May 16, 2014 at 1:05 AM, Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> wrote:
>> On x86 platforms, IRQ number are statically allocated to IOAPIC pins at boot.
>> There are two issues with this design. First it causes trouble to IOAPIC
>> hotplug because we need to allocate a block of IRQ numbers for each IOAPIC.
>> Second it may waste IRQ nubmers even if some IOAPIC pins are not used because
>> IRQ numbers are statically assigned.
>>
>> This patchset tries to enable dynamic IRQ number allocation for IOAPIC
>> by adopting the irqdomain framework, it solves the two issues mentioned
>> above. It also simplifies the IOAPIC driver by consolidating ways to
>> program IOAPIC pins with the irqdomain map interface.
>>
>> We will enhance the IOAPIC driver core to support ACPI based IOAPIC hotplug
>> once the IOAPIC driver has been converted to irqdomain.
>>
>> This patchset applies to v3.15-rc4-260-g38583f095c5a and has been tested
>> on a two socket 64 bit Intel platforms with:
>> 1) ACPI and mpparse enabled (boot successfully)
>> 2) Mpparse enabled with ACPI disabled (boot successfully)
>> 3) ACPI enabled with Mpparse disabled (boot successfully)
> 
> Great. I don't need to look into using irqdomain for x86 by myself.
> 
> Thomas put some irq clean up patches in tip irq branch.
> 
> Can you rebase your irqdomain/for x86 on top of that?
> Also would be better if you can put your patches in git branch.
Hi Yinghai,
	I have rebased to tip/irq/core branch and will send out new patch set
after basic tests. I have no account at kernel.org, so will
try to setup a gate on github next time.
Thanks!
> 
> Thanks
> 
> Yinghai
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