From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dma-mapping: support non-consistent DMA attribute
Date: Wed, 25 Feb 2015 11:24:18 +0100 [thread overview]
Message-ID: <16874142.jSTJ8OZePS@wuerfel> (raw)
In-Reply-To: <1424810703-20382-1-git-send-email-drake@endlessm.com>
On Tuesday 24 February 2015 14:45:03 Daniel Drake wrote:
> Currently when arm_dma_mmap() is called, vm_page_prot is reset
> according to DMA attributes. Currently, writecombine is the
> only attribute supported; any other configuration will map uncached
> memory.
>
> Add support for the non-consistent attribute so that cachable memory
> can be mapped into userspace via the dma_mmap_attrs() API.
>
> Signed-off-by: Daniel Drake <drake@endlessm.com>
>
How does the user process enforce consistency then?
Arnd
next prev parent reply other threads:[~2015-02-25 10:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-24 20:45 [PATCH] ARM: dma-mapping: support non-consistent DMA attribute Daniel Drake
2015-02-25 10:24 ` Arnd Bergmann [this message]
2015-02-25 13:58 ` Daniel Drake
2015-02-25 14:18 ` Russell King - ARM Linux
2015-02-25 14:30 ` Daniel Drake
2015-02-25 14:42 ` Russell King - ARM Linux
2015-02-25 15:21 ` Daniel Drake
2015-02-25 16:31 ` Jasper St. Pierre
2015-02-25 17:25 ` Russell King - ARM Linux
2015-02-25 17:27 ` Jasper St. Pierre
2015-02-25 10:36 ` Russell King - ARM Linux
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