Re: [RESEND PATCH 0/3] Add MEMREMAP_WC to fix dma_init_coherent_memory

[Brian Starkey]

Hi,

Are there any comments on these? Without them dma-coherent can't be used
on arm64 so it would be good to get them merged if there are no
objections.

I can resend with Michal's ack for patch 2 if needed.

Thanks,
Brian

On Tue, Jan 05, 2016 at 04:41:25PM +0000, Brian Starkey wrote:
> Hi,
>
> This may well have been buried with the holidays. It still applies
> fine on next-20160105, but I notice patch 2 will trivially conflict
> with [2] on some context lines.
>
> As discussed here[1], these patches implement a MEMREMAP_WC flag for
> memremap(), which can be used to obtain writecombine mappings. This
> is then used for setting up dma_coherent_mem regions which use the
> DMA_MEMORY_MAP flag.
>
> Patch 3 makes sure that the appropriate memset function is used
> when zeroing coherent allocations, which fixes an alignment fault on
> arm64.
>
> Best Regards,
> Brian
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/390857.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-January/397163.html
>
> Brian Starkey (3):
>  memremap: add MEMREMAP_WC flag
>  drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP
>  drivers: dma-coherent: use memset_io for DMA_MEMORY_IO
>
> drivers/base/dma-coherent.c |   25 ++++++++++++++++++++-----
> include/linux/io.h          |    1 +
> kernel/memremap.c           |   15 +++++++++++++--
> 3 files changed, 34 insertions(+), 7 deletions(-)
>
> --
> 1.7.9.5