On Mon, 2019-10-14 at 21:59 +0100, Catalin Marinas wrote:

On Mon, Oct 14, 2019 at 08:31:02PM +0200, Nicolas Saenz Julienne wrote:

quoted

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

Yes, forgot to mention it. It's relevant for the first patch.

which I queued here:

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

Thanks!

A little off topic but I was wondering if you have a preferred way to refer to
the arm architecture in a way that it unambiguously excludes arm64 (for example
arm32 would work).

Regards,
Nicolas