Hi Christoph,
On Fri, 2018-05-18 at 15:45 +0200, Christoph Hellwig wrote:
> Hi all,
>
> this series continues consolidating the dma-mapping code, with a focus
> on architectures that do not (always) provide cache coherence for DMA.
> Three architectures (arm, mips and powerpc) are still left to be
> converted later due to complexity of their dma ops selection.
>
> The dma-noncoherent ops calls the dma-direct ops for the actual
> translation of streaming mappins and allow the architecture to provide
> any cache flushing required for cpu to device and/or device to cpu
> ownership transfers. The dma coherent allocator is for now still left
> entirely to architecture supplied implementations due the amount of
> variations. Hopefully we can do some consolidation for them later on
> as well.
>
> Because this series sits on top of two previously submitted series
> a git tree might be useful to actually test it. It is provided here:
>
> git://git.infradead.org/users/hch/misc.git arc-dma
>
> Gitweb:
>
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__git.infradead.org_users_hch_misc.git_shortlog_refs_heads_arc-2Ddma&d=DwIBAg&c=DPL6_X_6JkXFx7
> AXWqB0tg&r=lqdeeSSEes0GFDDl656eViXO7breS55ytWkhpk5R81I&m=QNC0zOG4bRotSxdjQfFXl0dAQJCtnxtF9435wAuJlu0&s=Wad1ptsFpknoSn0ebr3_QMJn9G_D3eIS-LYMwGfOJ-
> I&e=
>
> Changes since previous bigger series:
> - take the offset into account in noncoherent_dma_map_page (Alexey Brodkin)
> - fix dma directions in arc (Alexey Brodkin)
> - split arc changes into smaller patches
I really like this series especially how it trimmed down arch/arc/mm/dma.c:
---------------------------->8----------------------------
git diff --stat HEAD~4
arch/arc/Kconfig | 4 +++
arch/arc/include/asm/Kbuild | 1 +
arch/arc/include/asm/dma-mapping.h | 21 ---------------
arch/arc/mm/cache.c | 2 +-
arch/arc/mm/dma.c | 162
++++++++++------------------------------------------------------------------------------------------------
---------
---------------------------->8----------------------------
So if we set aside my complaints about direction in
arch_sync_dma_for_{device|cpu}()...
Tested-by: Alexey Brodkin <[email protected]>
Let's still wait for Vineet's ack as he's the chief maintainer for ARC :)
-Alexey
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