linux-kernel - Re: fully convert arm to use dma-direct

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Message-ID: <87pmkq7tmx.wl-maz@kernel.org>
Date:   Fri, 06 May 2022 13:06:14 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Christoph Hellwig <hch@....de>
Cc:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>,
        Andre Przywara <andre.przywara@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: fully convert arm to use dma-direct

On Fri, 22 Apr 2022 22:17:20 +0100,
Linus Walleij <linus.walleij@...aro.org> wrote:
> 
> On Thu, Apr 21, 2022 at 9:42 AM Christoph Hellwig <hch@....de> wrote:
> 
> > arm is the last platform not using the dma-direct code for directly
> > mapped DMA.  With the dmaboune removal from Arnd we can easily switch
> > arm to always use dma-direct now (it already does for LPAE configs
> > and nommu).  I'd love to merge this series through the dma-mapping tree
> > as it gives us the opportunity for additional core dma-mapping
> > improvements.
> (...)
> 
> >  b/arch/arm/mach-footbridge/Kconfig                   |    1
> >  b/arch/arm/mach-footbridge/common.c                  |   19
> >  b/arch/arm/mach-footbridge/include/mach/dma-direct.h |    8
> >  b/arch/arm/mach-footbridge/include/mach/memory.h     |    4
> 
> I think Marc Z has a Netwinder that he can test this on. Marc?
> I have one too, just not much in my office because of parental leave.

Finally found some time to hook the machine up and throw a new kernel
at it. Booted at its usual glacial speed, so FWIW:

Tested-by: Marc Zyngier <maz@...nel.org>

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.