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To: ebiederm@xmission.com (Eric W. Biederman)
Cc: Andi Kleen <ak@suse.de>, linux-kernel@vger.kernel.org, mst@mellanox.co.il,
       jackm@mellanox.co.il
Subject: Re: pgprot_writecombine() and PATs on x86
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From: Roland Dreier <rdreier@cisco.com>
Date: Wed, 25 Apr 2007 11:35:15 -0700
In-Reply-To: <m1abwws3uh.fsf@ebiederm.dsl.xmission.com> (Eric W. Biederman's message of "Wed, 25 Apr 2007 12:31:34 -0600")
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 > Roland is the mlx4 sane enough to put the memory that needs
 > write-combining a prefetchable bar.  So several cards can be combined
 > together?

Yes, it is in a prefetchable BAR.  It's the second half of the second
BAR in:

    0d:00.0 InfiniBand: Mellanox Technologies Unknown device 634a (rev a0)
            Subsystem: Mellanox Technologies Unknown device 634a
            Flags: bus master, fast devsel, latency 0, IRQ 16
            Memory at fc400000 (64-bit, non-prefetchable) [size=1M]
            Memory at d8000000 (64-bit, prefetchable) [size=8M]
            Memory at fc3fe000 (64-bit, non-prefetchable) [size=8K]
            Capabilities: <access denied>

but I'm not sure what you mean about combining several cards?

 - R.