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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Fri, 22 Apr 2022 23:17:20 +0200
Message-ID: <CACRpkdbdKBfmXGdyTm3T-MFAK30N-z4KH0k8eD8F7xaYUbDDhA@mail.gmail.com>
Subject: Re: fully convert arm to use dma-direct
To:     Christoph Hellwig <hch@lst.de>, Marc Zyngier <maz@kernel.org>
Cc:     Russell King <linux@armlinux.org.uk>,
        Arnd Bergmann <arnd@kernel.org>,
        Andre Przywara <andre.przywara@arm.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alan Stern <stern@rowland.harvard.edu>,
        Laurentiu Tudor <laurentiu.tudor@nxp.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        iommu@lists.linux-foundation.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org
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On Thu, Apr 21, 2022 at 9:42 AM Christoph Hellwig <hch@lst.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.

Yours,
Linus Walleij