linux-kernel - Re: [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support

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Message-ID: <20191014205859.GA7634@iMac-3.local>
Date:   Mon, 14 Oct 2019 21:59:00 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-s390@...r.kernel.org,
        f.fainelli@...il.com, linux-kernel@...r.kernel.org,
        hch@...radead.org, mbrugger@...e.com, wahrenst@....net,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support

On Mon, Oct 14, 2019 at 08:31:02PM +0200, Nicolas Saenz Julienne wrote:
> the Raspberry Pi 4 offers up to 4GB of memory, of which only the first
> is DMA capable device wide. This forces us to use of bounce buffers,
> which are currently not very well supported by ARM's custom DMA ops.
> Among other things the current mechanism (see dmabounce.c) isn't
> suitable for high memory. Instead of fixing it, this series introduces a
> way of selecting dma-direct as the default DMA ops provider which allows
> for the Raspberry Pi to make use of swiotlb.

I presume these patches go on top of this series:

http://lkml.kernel.org/r/20190911182546.17094-1-nsaenzjulienne@suse.de

which I queued here:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/zone-dma

-- 
Catalin