From: Boris Brezillon <boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
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Andrew Morton
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Maxime Ripard
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devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.orgRichard
Weinberger <r>
Subject: Re: [PATCH v2 4/7] scatterlist: add sg_alloc_table_from_buf() helper
Date: Wed, 30 Mar 2016 20:18:31 +0200 [thread overview]
Message-ID: <20160330201831.38e1d6bd@bbrezillon> (raw)
In-Reply-To: <20160330165143.GI2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
On Wed, 30 Mar 2016 09:51:43 -0700
Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> On Wed, Mar 30, 2016 at 05:39:51PM +0200, Boris Brezillon wrote:
> > sg_alloc_table_from_buf() provides an easy solution to create an sg_table
> > from a virtual address pointer. This function takes care of dealing with
> > vmallocated buffers, buffer alignment, or DMA engine limitations (maximum
> > DMA transfer size).
>
> This seems nice. Should we also have a further helper on top of this
> which will get constraints from a dmaengine, it seems like it'd be a
> common need?
Yep, we could create a wrapper extracting dma_slave caps info,
converting it to sg_constraints and calling sg_alloc_table_from_buf().
But let's try to get this function accepted first, and I'll send another
patch providing this wrapper.
BTW, do you see other things that should be added in sg_constraints?
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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next prev parent reply other threads:[~2016-03-30 18:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-30 15:39 [PATCH v2 0/7] mtd: nand: sunxi: add support for DMA operations Boris Brezillon
[not found] ` <1459352394-22810-1-git-send-email-boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-03-30 15:39 ` [PATCH v2 1/7] mtd: nand: sunxi: move some ECC related operations to their own functions Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 2/7] mtd: nand: sunxi: make OOB retrieval optional Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 3/7] mtd: nand: sunxi: make cur_off parameter optional in extra oob helpers Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 4/7] scatterlist: add sg_alloc_table_from_buf() helper Boris Brezillon
[not found] ` <1459352394-22810-5-git-send-email-boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-03-30 16:51 ` Mark Brown
[not found] ` <20160330165143.GI2350-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-30 18:18 ` Boris Brezillon [this message]
2016-03-30 18:34 ` Mark Brown
2016-04-05 7:11 ` Dave Gordon
2016-03-31 4:56 ` [v2,4/7] " Vignesh R
[not found] ` <56FCAE1B.90206-l0cyMroinI0@public.gmane.org>
2016-03-31 7:26 ` Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 5/7] mtd: provide helper to prepare buffers for DMA operations Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 6/7] mtd: nand: sunxi: add support for DMA assisted operations Boris Brezillon
2016-03-30 15:39 ` [PATCH v2 7/7] mtd: nand: sunxi: update DT bindings Boris Brezillon
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