linux-kernel - Re: [PATCH 1/2] dw_dmac: set CAP_PRIVATE capability for DW DMA controller

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Message-ID: <49D2FBEF.7080607@intel.com>
Date:	Tue, 31 Mar 2009 22:30:23 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
CC:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dw_dmac: set CAP_PRIVATE capability for DW DMA controller

Hans-Christian Egtvedt wrote:
> The weird part was that when testing this, the dma_request_channel()
> would not return any channel before DMA_PRIVATE flag was set. I think I
> did this some time ago, I can do a retest with the current 2.6.29 and
> see how it behaves.
> 

If CONFIG_NET_DMA=y then available channels will be consumed for 
'public' usage.  I would turn that option off for AVR32 as it hurts 
performance on dma-incoherent archs like ARM.  Async_tx will also 
consume public channels if loaded.  2.6.30 will have the 
CONFIG_ASYNC_TX_DMA option to turn off this allocation... or just set 
DMA_PRIVATE and not worry these :-).

--
Dan
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