linux-kernel - Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Message-Id: <20061114.200719.38322619.davem@davemloft.net>
Date:	Tue, 14 Nov 2006 20:07:19 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	benh@...nel.crashing.org
Cc:	torvalds@...l.org, jeff@...zik.org, linux-kernel@...r.kernel.org,
	tiwai@...e.de
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Date: Wed, 15 Nov 2006 15:01:00 +1100

> Out of curiosity. Are you sure there is no case of stupid bridge
> converting the MSI into some APIC/whatever interrupt for the CPU
> potentially before all previous DMA have been fully pushed to the
> coherent domain (still in some internal store queue for example) ?

That would really suck, wouldn't it :)

However, they have to do all the work of processing the memory
transation that the MSI is on the PCI bus, I don't think they would go
so far out of their way to reorder things even if they converted the
MSI packet into a PIN to the APIC, for example.
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