linux-kernel - Re: [PATCH 00/16] Add new DMA mapping operation for P2PDMA

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Message-ID: <52f14602-94bc-fa98-0b97-5f4084d808a0@nvidia.com>
Date:   Tue, 27 Apr 2021 13:21:50 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>,
        Logan Gunthorpe <logang@...tatee.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-nvme@...ts.infradead.org>,
        <linux-block@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-mm@...ck.org>, <iommu@...ts.linux-foundation.org>,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Christian König <christian.koenig@....com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jakowski Andrzej <andrzej.jakowski@...el.com>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 00/16] Add new DMA mapping operation for P2PDMA

On 4/27/21 12:28 PM, Jason Gunthorpe wrote:
> On Thu, Apr 08, 2021 at 11:01:07AM -0600, Logan Gunthorpe wrote:
>> Hi,
>>
>> This patchset continues my work to to add P2PDMA support to the common
>> dma map operations. This allows for creating SGLs that have both P2PDMA
>> and regular pages which is a necessary step to allowing P2PDMA pages in
>> userspace.
>>
>> The earlier RFC[1] generated a lot of great feedback and I heard no show
>> stopping objections. Thus, I've incorporated all the feedback and have
>> decided to post this as a proper patch series with hopes of eventually
>> getting it in mainline.
>>
>> I'm happy to do a few more passes if anyone has any further feedback
>> or better ideas.
> 
> For the user of the DMA API the idea seems reasonable enough, the next
> steps to integrate with pin_user_pages() seem fairly straightfoward
> too
> 
> Was there no feedback on this at all?
> 

oops, I meant to review this a lot sooner, because this whole p2pdma thing is
actually very interesting and important...somehow it slipped but I'll take
a look now.

thanks,
-- 
John Hubbard
NVIDIA