linux-kernel - Re: [PATCHv4] DMAEngine: Define interleaved transfer request api

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Date:	Thu, 6 Oct 2011 12:42:28 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
Cc:	Russell King <rmk@....linux.org.uk>,
	Barry Song <21cnbao@...il.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>,
	Dave Jiang <dave.jiang@...el.com>
Subject: Re: [PATCHv4] DMAEngine: Define interleaved transfer request api

On 5 October 2011 23:44, Williams, Dan J <dan.j.williams@...el.com> wrote:
>
> This new operation type strikes me as being in a similar vein to
> commit a08abd8c "async_tx: structify submission arguments, add
> scribble", in that we convert multiple submission arguments into one
> description template.  With some tweaks it could probably even cover
> the DMA_CYCLIC, but probably could not cover the raid ops.  In general
> I'm concerned about operation type proliferation, so if we added this
> one I'd like to see others removed.
>
ATM this api is meant to provide a way for clients to express
interleaved (in bytes) transfers which are not possible using any
other api.

I do share your concern about operation type proliferation, and in fact
tried to make this api so that at least some prepares could be merged
in to it, but I am not sure how reasonable would it be hold this api
at ransom until other prepares are merged.
The way I see things, if we make this api generic enough we could
disallow adding more apis and merge extant ones into it one by one
at our own pace.

-j
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