linux-kernel - Re: [PATCH v4 4/8] PCI: brcmstb: Add dma-range mapping for inbound traffic

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Message-ID: <20180118073123.GA15766@lst.de>
Date:   Thu, 18 Jan 2018 08:31:23 +0100
From:   Christoph Hellwig <hch@....de>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Jim Quinlan <jim2101024@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Brian Norris <computersforpeace@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonas Gorski <jonas.gorski@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        linux-pci@...r.kernel.org, Kevin Cernekee <cernekee@...il.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Gregory Fong <gregory.0xf0@...il.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 4/8] PCI: brcmstb: Add dma-range mapping for inbound
        traffic

On Wed, Jan 17, 2018 at 08:15:33PM -0600, Rob Herring wrote:
> > (a) overriding/redefining the dma_to_phys() and phys_to_dma() calls
> > that are used by the dma_ops routines.  This is the approach of
> >
> >         arch/mips/cavium-octeon/dma-octeon.c
> 
> MIPS is rarely an example to follow. :)

But in this case it actually is the example to follow as told previously.

NAK again for these chained dma ops that only create problems.