linux-kernel - Re: [RESEND PATCH 0/3] Add MEMREMAP_WC to fix dma_init_coherent

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Date:	Fri, 29 Jan 2016 09:32:59 +0000
From:	Brian Starkey <brian.starkey@....com>
To:	gregkh@...uxfoundation.org
Cc:	catalin.marinas@....com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>
Subject: Re: [RESEND PATCH 0/3] Add MEMREMAP_WC to fix
 dma_init_coherent_memory

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
>