From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] arm: DMA-API contiguous cacheable memory
Date: Tue, 19 May 2015 23:09:36 +0100 [thread overview]
Message-ID: <20150519220936.GL2067@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAE=W-e1qynowbccHpYntWwwZPZOMHAVXH=Yj3ukyr_X8WKwQJQ@mail.gmail.com>
On Wed, May 20, 2015 at 12:05:54AM +0200, Lorenzo Nava wrote:
> Maybe my interpretation of dma_alloc_coherent() is not correct, and
> the coherency can be managed using the dma_sync_single_for_* functions
> and it doesn't require hardware mechanism.
dma_sync_single_for_* are only for use with the streaming DMA API,
where you must have already mapped the buffer using one of the
dma_map_* functions. Anything other than that is abusing the API.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2015-05-19 22:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-18 20:56 [RFC] arm: DMA-API contiguous cacheable memory Lorenzo Nava
2015-05-19 16:34 ` Catalin Marinas
2015-05-19 22:05 ` Lorenzo Nava
2015-05-19 22:09 ` Russell King - ARM Linux [this message]
2015-05-19 22:14 ` Arnd Bergmann
2015-05-19 22:27 ` Lorenzo Nava
2015-05-19 22:34 ` Russell King - ARM Linux
2015-05-20 12:57 ` Lorenzo Nava
2015-05-20 16:20 ` Russell King - ARM Linux
2015-05-20 21:49 ` Lorenzo Nava
2015-05-19 22:09 ` Lorenzo Nava
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