linux-kernel - Re: [v2.6.26] what's brewing in x86.git for v2.6.26

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Message-ID: <adar6d5ilit.fsf@cisco.com>
Date:	Wed, 16 Apr 2008 13:37:30 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [v2.6.26] what's brewing in x86.git for v2.6.26

 >  - PAT support - first step towards phasing out MTRR's for cache 
 >    attribute control

I just grabbed your tree and I see that there is no
pgprot_writecombine() for x86.  I see that pci_mmap_page_range() handles
write combining but there's no way for a PCI driver to allow userspace
to mmap() part of a BAR with WC enabled.  Doing this gives a big
performance boost for running low-latency apps on InfiniBand hardware
driven by the mlx4 driver (look for the FIXME about it in
drivers/infiniband/hw/mlx4/main.c).  Are there any plans to handle this
somehow?

Thanks,
  Roland
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