[PATCH] arm64: Fix the DMA mmap and get_sgtable API with DMA_ATTR_FORCE_CONTIGUOUS

[Geert Uytterhoeven]

Hi Catalin,

On Thu, May 4, 2017 at 4:03 PM, Catalin Marinas <catalin.marinas at arm.com> wrote:
> Going through the past threads on this, I wonder whether the attribute
> is actually used anywhere (in which case we may be better off reverting
> the original patch). If improved IOMMU performance is required, there

AFAIK, the users are somewhere in the pipeline.

> are likely better ways to achieve this like using a different page size
> at the IOMMU level.

If I'm not mistaken, it's intended to be used when one device cannot use
the IOMMU for whatever reason.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds