linux-kernel - Re: pgprot_writecombine() and PATs on x86

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Message-ID: <adaodlcwbdo.fsf@cisco.com>
Date:	Wed, 25 Apr 2007 11:35:15 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	mst@...lanox.co.il, jackm@...lanox.co.il
Subject: Re: pgprot_writecombine() and PATs on x86

 > 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.
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