Re: ioremap_uc() followed by set_memory_wc() - burrying MTRR

[Doug Ledford <dledford@redhat.com>]

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On Wed, 2015-04-22 at 14:46 -0600, Jason Gunthorpe wrote:
> On Wed, Apr 22, 2015 at 02:53:11PM -0400, Doug Ledford wrote:
> 
> > To be precise, the split is that ipath powers the old HTX bus cards that
> > only work in AMD systems, qib is all PCI-e cards.  I still have a few
> > HTX cards, but I no longer have any systems with HTX slots, so we
> > haven't even used this driver in testing for 3 or 4 years now.  And
> > these are all old SDR cards, where the performance numbers were 800MB/s
> > with WC enabled, 50MB/s without it.
> 
> Wow, I doubt any HTX systems are still in any kind of use.
> 
> It would be a nice clean up to drop the PPC support out of this driver
> too. PPC never had HTX.

commit f6d60848baf9f4015c76c665791875ed623cd5b7
Author: Ralph Campbell <ralph.campbell@qlogic.com>
Date:   Thu May 6 17:03:19 2010 -0700

    IB/ipath: Remove support for QLogic PCIe QLE devices
    
    The ib_qib driver is taking over support for QLogic PCIe QLE
devices,
    so remove support for them from ib_ipath.  The ib_ipath driver now
    supports only the obsolete QLogic Hyper-Transport IB host channel
    adapter (model QHT7140).
    
    Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
    Signed-off-by: Roland Dreier <rolandd@cisco.com>

There you go.  It's been HTX only since 2010, and those cards were
already old then.  I think we should seriously consider deprecating and
then removing the driver.


-- 
Doug Ledford <dledford@redhat.com>
              GPG KeyID: 0E572FDD



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