linux-kernel - Re: Flushing writes to PCI devices

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Message-Id: <1158862442.29551.22.camel@sardonyx>
Date:	Thu, 21 Sep 2006 11:14:02 -0700
From:	Bryan O'Sullivan <bos@...pentine.com>
To:	Bill Waddington <william.waddington@...zmo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Flushing writes to PCI devices

On Wed, 2006-09-20 at 12:41 -0700, Bill Waddington wrote:

> Are there ever any issues with out-of-order writes from the posting
> buffer on supported architectures?

Yes.  If your device requires that writes to some locations in MMIO
space be performed in a specific order, you must explicitly do this in
your driver.  Intel CPUs will flush posted writes out of order, for
example.

	<b

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