linux-kernel - Re: [PATCH v2 14/16] irqchip: mips-gic: Support local interrupts

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Date:	Fri, 5 Sep 2014 14:50:02 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jason Cooper <jason@...edaemon.net>,
	Jeffrey Deans <jeffrey.deans@...tec.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Arnd Bergmann <arnd@...db.de>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>,
	Linux-MIPS <linux-mips@...ux-mips.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 14/16] irqchip: mips-gic: Support local interrupts

On Fri, Sep 5, 2014 at 12:05 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Fri, 5 Sep 2014, Andrew Bresticker wrote:
>>  static void gic_mask_irq(struct irq_data *d)
>>  {
>> -     GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
>> +     unsigned int irq = d->irq - gic_irq_base;
>> +
>> +     if (gic_is_local_irq(irq)) {
>> +             GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK),
>> +                      1 << GIC_INTR_BIT(gic_hw_to_local_irq(irq)));
>> +     } else {
>> +             GIC_CLR_INTR_MASK(irq);
>> +     }
>>  }
>>
>>  static void gic_unmask_irq(struct irq_data *d)
>>  {
>> -     GIC_SET_INTR_MASK(d->irq - gic_irq_base);
>> +     unsigned int irq = d->irq - gic_irq_base;
>> +
>> +     if (gic_is_local_irq(irq)) {
>> +             GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK),
>> +                      1 << GIC_INTR_BIT(gic_hw_to_local_irq(irq)));
>> +     } else {
>> +             GIC_SET_INTR_MASK(irq);
>> +     }
>
> Why are you adding a conditional in all these functions instead of
> having two interrupt chips with separate callbacks and irqdata?

Ok, I'll use a separate irqchip.

> And looking at GIC_SET_INTR_MASK(irq) makes me shudder even more. The
> whole thing can be replaced with the generic interrupt chip functions.
>
> If you set it up proper, then there is not a single conditional or
> runtime calculation of bitmasks, address offsets etc.

Yes, I'd like to use the generic irqchip library here, but Malta and
SEAD-3 will need to be converted over to using irq domains.  Perhaps
I'll do that first - it should get rid of a lot of the other ugliness
here as well.
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