linux-kernel - Re: [PATCH] pci: change msi-x vector to 32bit

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Message-ID: <48A9E899.8000303@zytor.com>
Date:	Mon, 18 Aug 2008 14:24:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Vasquez <andrew.vasquez@...gic.com>
Subject: Re: [PATCH] pci: change msi-x vector to 32bit

Eric W. Biederman wrote:
> 
> I believe assign_irq_vector on x86_64 and soon on x86_32 does this already.
> 
> The number that was being changed was the irq number of for the
> msi-x ``vectors'' from some random free irq number to roughly
> bus(8 bits):device+function(8 bits):msix-vector(12 bits) so that we
> could have a stable irq number for msi irqs.
> 
> Once pci domain is considered it is hard to claim we have enough bits.
> I expect we need at least pci domains to have one per NUMA node, in
> the general case.
> 
[...]
> 
> So once we have all of that.  It becomes possible to look at assigning a static
> irq number to each pci (bus:device:function:msi-x vector) pair so the system
> is more reproducible.
> 

Domain, again?

	-hpa
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