linux-kernel - Re: [PATCH v3 0/3] genirq: handling GIC per-cpu interrupts

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Message-ID: <20110927102135.GD17997@S2100-06.ap.freescale.net>
Date:	Tue, 27 Sep 2011 18:21:36 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 0/3] genirq: handling GIC per-cpu interrupts

On Fri, Sep 23, 2011 at 05:03:05PM +0100, Marc Zyngier wrote:
> The current GIC per-cpu interrupts (aka PPIs) suffer from a number of
> problems:
> 
> - They use a completely separate scheme to handle the interrupts,
>   mostly because the PPI concept doesn't really match the kernel view
>   of an interrupt.
> - PPIs can only be used by the timer code, unless we add more low-level
>   assembly code.
> - The local timer code can only be used by devices generating PPIs,
>   and not SPIs.
> - At least one platform (msm) has started implementing its own
>   alternative scheme.
> - Some low-level code gets duplicated, as usual...
> 
> The proposed solution is to handle the PPIs using the same path as
> SPIs. A new core API is added to deal with per-cpu interrupts in a
> less awkward way. The local timer code is updated to reflect these
> changes.
> 
> The core API changes are based on an initial idea by Thomas Gleixner.
> 
> Tested on ARM Versatile Express (Cortex A15), ARM RealView PB11MP,
> OMAP4 (Panda) and Tegra (Harmony). Patch series against next-20110923.
> 
> From v2:
> - Fixed !GENERIC_HARDIRQS build
> - Fixed request_percpu_irq documentation
> 
> From v1:
> - General tidy-up after Thomas' review. I've kept the config option
>   for the time being until we can sort out the anonymous union
>   problem.
> 
> Marc Zyngier (3):
>   genirq: add support for per-cpu dev_id interrupts
>   ARM: gic: consolidate PPI handling
>   ARM: gic, local timers: use the request_percpu_irq() interface
> 
On imx6q:

Tested-by: Shawn Guo <shawn.guo@...aro.org>

-- 
Regards,
Shawn

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