linux-kernel - Re: Does it need to implement irq_set_type method in the ioapic

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Message-ID: <alpine.DEB.2.02.1402191259590.4468@ionos.tec.linutronix.de>
Date:	Wed, 19 Feb 2014 13:07:09 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	carl peng <carlpeng008@...il.com>
cc:	"H. Peter Anvin" <hpa@...or.com>, mingo@...hat.com, x86@...nel.org,
	pingfank@...ux.vnet.ibm.com, yoshihiro.yunomae.ez@...achi.com,
	linux-kernel@...r.kernel.org
Subject: Re: Does it need to implement irq_set_type method in the
 ioapic_chip?

On Wed, 19 Feb 2014, carl peng wrote:
> At last, the device will be connected to AMBA bus, so the interrupt
> pin will be connected to IOAPIC through AMBA bus. The device now
> is in the pre-silicon verification stage.
> 
> So my question is the same:
> Why does APIC driver not implement the irq_set_type method?  if

Because we do not need it. All devices are properly connected and
configured by the BIOS and bus discovery.

> implement it, will supply more free space for the device driver
> developer(they can set the interrupttrigger mode by calling request_irq).

There are 3 different mechanisms already to tell the kernel to
configure a particular irq line: ACPI, MP Tables and SFI.

That's the way x86 does its interrupt configuration and there is no
need to provide another one.

Thanks,

	tglx
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