linux-kernel - Re: [Query] doubt on parameters passed to dma_map_single

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Date:	Tue, 22 Mar 2016 12:34:08 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sodagudi Prasad <psodagud@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	shashim@...eaurora.org, sboyd@...eaurora.org
Subject: Re: [Query]  doubt on parameters passed to dma_map_single_attrs() API

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.

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