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Date: Thu, 3 Aug 2017 10:58:17 +0530
From: Vinod Koul <vinod.koul@intel.com>
Subject: Re: [PATCH v2 5/5] libnvdimm: add DMA support for pmem blk-mq
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To: "Jiang, Dave" <dave.jiang@intel.com>, \
Cc: Sinan Kaya <okaya@codeaurora.org>, "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
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On Thu, Aug 03, 2017 at 10:41:51AM +0530, Jiang, Dave wrote:
> 
> 
> > On Aug 2, 2017, at 9:58 PM, Koul, Vinod <vinod.koul@intel.com> wrote:
> > 
> >> On Wed, Aug 02, 2017 at 02:13:56PM -0700, Dave Jiang wrote:
> >> 
> >> 
> >>> On 08/02/2017 02:10 PM, Sinan Kaya wrote:
> >>> On 8/2/2017 4:52 PM, Dave Jiang wrote:
> >>>>> Do we need a new API / new function, or new capability?
> >>>> Hmmm...you are right. I wonder if we need something like DMA_SG cap....
> >>>> 
> >>>> 
> >>> 
> >>> Unfortunately, DMA_SG means something else. Maybe, we need DMA_MEMCPY_SG
> >>> to be similar with DMA_MEMSET_SG.
> >> 
> >> I'm ok with that if Vinod is.
> > 
> > So what exactly is the ask here, are you trying to do MEMCPY or SG or MEMSET
> > or all :). We should have done bitfields for this though...
> 
> Add DMA_MEMCPY_SG to transaction type. 

Not MEMSET right, then why not use DMA_SG, DMA_SG is supposed for
scatterlist to scatterlist copy which is used to check for
device_prep_dma_sg() calls

-- 
~Vinod
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