linux-kernel - Re: [PATCH] sparse_irq aka dyn

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Message-ID: <4920B911.7060504@kernel.org>
Date:	Sun, 16 Nov 2008 16:21:37 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org, travis@....com
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13

H. Peter Anvin wrote:
> Yinghai Lu wrote:
>> H. Peter Anvin wrote:
>>> Yinghai Lu wrote:
>>>> 2. make irq number is bus/devfn/idx, and every dev func will use 12bit range, irq number is relatively fixed not like current MSI irq creating is some kind of floating from NR_IRQS too. 
>>> 2 is *STILL WRONG*, dammit!
>>>
>>> You keep bringing this one up, but our PCI addressing is
>>> *DOMAIN*/bus/devfn -- it falls flat on its face when you have more than
>>> 16 PCI domains.  CAN WE PLEASE STOP WITH THIS FOOLISHNESS NOW!
>> you want to u64 instead of unsigned int for irq?
>>
> 
> No, I think the whole notion of a static *numeric* identifier for an IRQ
> when it's something like MSI-X is simply pointless.  I think we should
> assign IRQ numbers beyond the legacy range dynamically.
> 
> I really don't think anyone gives a hoot about the IRQ number for any
> IRQ above the 0-15 legacy range, even including the "APIC" numbers 16+.

you want to change ioapic/pin to irq mapping too?

so INTx and MSI will call create_irq_nr to get one irq for 16, and following first come and first serve rule.

YH
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