linux-kernel - Re: [RFC PATCH 00/28] Removing struct page from P2PDMA

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Message-ID: <3379917c-0ebc-0019-a71c-12248f4668ee@deltatee.com>
Date:   Thu, 20 Jun 2019 17:42:50 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-rdma <linux-rdma@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [RFC PATCH 00/28] Removing struct page from P2PDMA



On 2019-06-20 5:40 p.m., Dan Williams wrote:
> This seems to be the most salient point. I was missing the fact that
> this replaces custom hacks and "special" pages with an explicit "just
> pass this pre-mapped address down the stack". It's functionality that
> might plausibly be used outside of p2p, as long as the driver can
> assert that it never needs to touch the data with the cpu before
> handing it off to a dma-engine.

Yup, that's a good way to put it. If I resend this patchset, I'll
include wording like yours in the cover letter.

Logan