linux-kernel - Re: PCIE

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Message-ID: <4658EE32.5080506@zytor.com>
Date:	Sat, 26 May 2007 19:34:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Miller <davem@...emloft.net>
CC:	abraham.manu@...il.com, rdreier@...co.com, greg@...ah.com,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: PCIE

David Miller wrote:
> 
>> i presume then i shouldn't be using IRQF_SHARED, if using MSI.
> 
> That's actually a really good question.
> 
> It is likely architecture dependant whether the PCI controller wires
> unique MSI interrupts to shared cpu interrupt lines.
> 
> I can imagine many systems where the cpu simply doesn't have enough
> interrupt pins to uniquely identify every possible MSI interrupt
> source.

There are systems which only get a single bit indication that an MSI has
happened.

Presumably we need something like IRQF_MSI which can be set as
appropriate depending on the architecture?

	-hpa
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