linux-kernel - Re: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller

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Date:	Mon, 8 Feb 2016 15:48:34 +0100
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	Thomas Gleixner <tglx@...utronix.de>, jason@...edaemon.net,
	tsahee@...apurnalabs.com, rshitrit@...apurnalabs.com,
	thomas.petazzoni@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller

On Mon, Feb 08, 2016 at 02:29:12PM +0000, Marc Zyngier wrote:
> On 08/02/16 14:17, Antoine Tenart wrote:
> > Thomas,
> > 
> > On Mon, Feb 08, 2016 at 11:31:47AM +0100, Thomas Gleixner wrote:
> >> On Mon, 8 Feb 2016, Antoine Tenart wrote:
> >>> +static int alpine_msix_set_affinity(struct irq_data *irq_data,
> >>> +				    const struct cpumask *mask, bool force)
> >>> +{
> >>> +	int ret;
> >>> +
> >>> +	ret = irq_chip_set_affinity_parent(irq_data, mask, force);
> >>> +	return ret == IRQ_SET_MASK_OK ? IRQ_SET_MASK_OK_DONE : ret;
> >>
> >> What's the point of this exercise? Why can't you just set the affinity
> >> callback to irq_chip_set_affinity_parent() ?
> > 
> > That's what done in irq-gic-v2m.c. Besides that, I see no point. I'll
> > update for v2.
> 
> That's because there is no need to do another compose_msi_msg/write_msg
> in msi_domain_set_affinity() once the affinity has been updated at the
> GIC level. Alternatively, updating the GIC driver to always return
> IRQ_SET_MASK_OK_DONE would be perfectly acceptable.

I'm using drivers/irqchip/irq-gic-v3.c which is indeed always returning
IRQ_SET_MASK_OK. I'll make a new patch in the v2 of this series to
return IRQ_SET_MASK_OK_DONE instead in the GIC driver (and then patch
irq-gic-v2m.c).

Thanks,

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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