linux-kernel - Re: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on weakly-ordered archs

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Date:   Thu, 22 Mar 2018 22:02:52 +0000
From:   Casey Leedom <leedom@...lsio.com>
To:     Sinan Kaya <okaya@...eaurora.org>, Jason Gunthorpe <jgg@...pe.ca>
CC:     SWise OGC <swise@...ngridcomputing.com>,
        'kbuild test robot' <lkp@...el.com>,
        "kbuild-all@...org" <kbuild-all@...org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "timur@...eaurora.org" <timur@...eaurora.org>,
        "sulrich@...eaurora.org" <sulrich@...eaurora.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Steve Wise <swise@...lsio.com>,
        "'Doug Ledford'" <dledford@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Werner <werner@...lsio.com>
Subject: Re: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on
 weakly-ordered archs

  Okay, thanks Sinan.  I ~think~ we're on the same page here.

  Our guy Michael Werner is carefully going through our drivers with Steve
Wise.  I'd like to let them work on the changes with a lot of thought and
testing before diving in too far.

  We had thought that we could get around the lack of a real Relaxed
Ordering Write on the PowerPC via the __raw_write*() API, but that isn't
really part of the defined API and various platforms define that API
differently (some doing PCI Byte Ordering rearrangements and some not).  I
think that we're going to have to work with the PowerPC platform folks to
get a real Relaxed Ordering Write.

Casey