linux-kernel - Re: [RFC][PATCH] genirq: support multiple interrupt priorities

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Date:	Mon, 6 Aug 2007 12:36:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] genirq: support multiple interrupt priorities

* Paul Mundt <lethal@...ux-sh.org> wrote:

> This is a simple patch for adding trivial interrupt priority support.
> 
> I've added a ->set_prio() to the irq_chip which is implemented 
> effectively the same way as ->set_type(), it's an optional component 
> for those that really care about it.

i have no fundamental objections but it would be nice to actually 
prototype this by implementing real priority support in the hardware: 
both the i8259A and the IO-APIC/local-apic has such IRQ prioritization 
features.

> + * IRQF_PRIO_HIGH - Give IRQ a high priority
> + * IRQF_PRIO_LOW - Give IRQ a low priority

this should be a numeric scale. (Preferably in the 1-99 range (the 
hardware can then do a lower-resolution thing out of it), so that we can 
directly map this to IRQ threads and SCHED_FIFO priorities in -rt.)

	Ingo
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