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

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Date:   Fri, 22 Apr 2022 23:17:20 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Christoph Hellwig <hch@....de>, Marc Zyngier <maz@...nel.org>
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 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.

Yours,
Linus Walleij