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

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Date:	Wed, 16 Dec 2015 16:56:03 +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
Subject: [PATCH 0/3] Add MEMREMAP_WC to fix dma_init_coherent_memory

Hi,

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

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(-)
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