linux-kernel - Re: [PATCH 4.2-rc1 v21 3/6] irqchip: gic: Introduce plumbing for IPI FIQ

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Date:	Tue, 7 Jul 2015 12:05:39 +0200
From:	Holger Schurig <holgerschurig@...il.com>
To:	Daniel Thompson <daniel.thompson@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	linaro-kernel@...ts.linaro.org,
	Russell King <linux@....linux.org.uk>, patches@...aro.org,
	Marc Zyngier <marc.zyngier@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Will Deacon <will.deacon@....com>,
	open list <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Drake <drake@...lessm.com>,
	Dmitry Pervushin <dpervushin@...il.com>,
	Dirk Behme <dirk.behme@...bosch.com>,
	John Stultz <john.stultz@...aro.org>,
	Tim Sander <tim@...eglstein.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4.2-rc1 v21 3/6] irqchip: gic: Introduce plumbing for IPI FIQ

> Currently it is not possible to exploit FIQ for systems with a GIC, even
> on systems are otherwise capable of it. This patch makes it possible
> for IPIs to be delivered using FIQ.

I wonder if gic_set_group_irq() can easily be married with mxc_set_irq_fiq().

The driver sound/soc/fsl/imx-pcm-fiq.c uses mxc_set_irq_fiq() to
connect an (assembly) FIQ handler with a hardware IRQ. However, the
underlying implementation of mxc_set_irq_fiq() is only supported for
TZIC and AVIC (see arch/arm/mach-imx/irq-common.c).

On my i.MX6, which doesn't have an AVIC/TZIC but a GIC I could use a
method to turn a normal IRQ into a FIQ :-)
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