From mboxrd@z Thu Jan  1 00:00:00 1970
From: marc.zyngier@arm.com (Marc Zyngier)
Date: Mon, 8 Feb 2016 15:01:39 +0000
Subject: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller
In-Reply-To: <20160208144834.GH4117@kwain>
References: <1454922971-17405-1-git-send-email-antoine.tenart@free-electrons.com>
 <1454922971-17405-2-git-send-email-antoine.tenart@free-electrons.com>
 <alpine.DEB.2.11.1602081125560.25254@nanos> <20160208141754.GG4117@kwain>
 <56B8A638.1040903@arm.com> <20160208144834.GH4117@kwain>
Message-ID: <56B8ADD3.4030404@arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 08/02/16 14:48, Antoine Tenart wrote:
> 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).

/me puzzled. GICv3, but no ITS??? WTF???

	M.
-- 
Jazz is not dead. It just smells funny...