From: Catalin Marinas <catalin.marinas@arm.com>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: Robin Murphy <robin.murphy@arm.com>,
linux-arm-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org,
iommu@lists.linux-foundation.org, linux-s390@vger.kernel.org,
f.fainelli@gmail.com, linux-kernel@vger.kernel.org,
hch@infradead.org, mbrugger@suse.com, wahrenst@gmx.net,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support
Date: Mon, 14 Oct 2019 21:59:00 +0100 [thread overview]
Message-ID: <20191014205859.GA7634@iMac-3.local> (raw)
In-Reply-To: <20191014183108.24804-1-nsaenzjulienne@suse.de>
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
next prev parent reply other threads:[~2019-10-14 20:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-14 18:31 [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support Nicolas Saenz Julienne
2019-10-14 18:31 ` [PATCH RFC 1/5] dma/direct: turn ARCH_ZONE_DMA_BITS into a variable Nicolas Saenz Julienne
2019-10-30 21:49 ` Christoph Hellwig
2019-10-31 10:30 ` Nicolas Saenz Julienne
2019-10-31 13:38 ` Christoph Hellwig
2019-10-31 17:26 ` Nicolas Saenz Julienne
2019-10-14 18:31 ` [PATCH RFC 2/5] ARM: introduce arm_dma_direct Nicolas Saenz Julienne
2019-10-15 10:04 ` Christoph Hellwig
2019-10-14 18:31 ` [PATCH RFC 3/5] ARM: let machines select dma-direct over arch's DMA implementation Nicolas Saenz Julienne
2019-10-14 18:31 ` [PATCH RFC 4/5] dma/direct: check for overflows in ARM's dma_capable() Nicolas Saenz Julienne
2019-10-15 10:23 ` Christoph Hellwig
2019-10-15 13:07 ` Nicolas Saenz Julienne
2019-10-14 18:31 ` [PATCH RFC 5/5] ARM: bcm2711: use dma-direct Nicolas Saenz Julienne
2019-10-14 20:59 ` Catalin Marinas [this message]
2019-10-15 7:48 ` [PATCH RFC 0/5] ARM: Raspberry Pi 4 DMA support Nicolas Saenz Julienne
2019-10-15 17:46 ` Catalin Marinas
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