From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Sodagudi Prasad <psodagud@codeaurora.org>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, shashim@codeaurora.org,
sboyd@codeaurora.org
Subject: Re: [Query] doubt on parameters passed to dma_map_single_attrs() API
Date: Tue, 22 Mar 2016 12:34:08 +0000 [thread overview]
Message-ID: <20160322123408.GN19428@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <eedb87e1131d74a77b49599648cc5aac@codeaurora.org>
On Tue, Mar 22, 2016 at 03:53:02PM +0530, Sodagudi Prasad wrote:
>
> Hi All,
>
> Would like to check whether the dma_map_single_attrs() API, can accept ptr
> variable from high memory or not?
It can't. Direct mapped, lowmem only.
No pointers allowed from dma_alloc_coherent(), dma_alloc_writecombine(),
ioremap(), vmalloc(), kmap(), kmap_atomic() or similar function, or
derived from one of these.
--
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
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prev parent reply other threads:[~2016-03-22 12:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-22 10:23 Sodagudi Prasad
2016-03-22 12:34 ` Russell King - ARM Linux [this message]
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