linux-kernel - Re: [PATCH 2/3] dma: override "dma_flags_set

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Message-ID: <46CBE960.4090702@sgi.com>
Date:	Wed, 22 Aug 2007 09:44:32 +0200
From:	Jes Sorensen <jes@....com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	akepner@....com, linux-kernel <linux-kernel@...r.kernel.org>,
	rdreier@...co.com, linux-ia64 <linux-ia64@...r.kernel.org>
Subject: Re: [PATCH 2/3] dma: override "dma_flags_set_dmaflush" for sn-ia64

Matthew Wilcox wrote:
> So, let me try to understand ... your hardware allows writes from the
> device to pass other writes from the device?  Doesn't that violate the
> PCI spec?  I'm thinking about this (page 43 of PCI 2.3):

Hi Matthew,

Yes I believe this behavior on sn2 is 'bending' the PCI spec a bit. The
problem is that the NUMA fabric is a routed network in itself so there
can be multiple paths between the device and the physical memory it DMAs
to/from.

Cheers,
Jes
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