From: Jason Gunthorpe <jgg@ziepe.ca>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: "Leon Romanovsky" <leon@kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"Doug Ledford" <dledford@redhat.com>,
"Vetter, Daniel" <daniel.vetter@intel.com>,
"Christian König" <christian.koenig@amd.com>,
"Xiong, Jianxin" <jianxin.xiong@intel.com>
Subject: Re: [RFC PATCH v2 0/3] RDMA: add dma-buf support
Date: Fri, 3 Jul 2020 10:14:45 -0300 [thread overview]
Message-ID: <20200703131445.GU25301@ziepe.ca> (raw)
In-Reply-To: <CAKMK7uGqABchpPLTm=vmabkwK3JJSzWTFWhfU+ywbwjw-HgSzw@mail.gmail.com>
On Fri, Jul 03, 2020 at 02:52:03PM +0200, Daniel Vetter wrote:
> So maybe I'm just totally confused about the rdma model. I thought:
> - you bind a pile of memory for various transactions, that might
> happen whenever. Kernel driver doesn't have much if any insight into
> when memory isn't needed anymore. I think in the rdma world that's
> called registering memory, but not sure.
Sure, but once registered the memory is able to be used at any moment with
no visibilty from the kernel.
Unlike GPU the transactions that trigger memory access do not go
through the kernel - so there is no ability to interrupt a command
flow and fiddle with mappings.
Jason
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-07-06 7:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1593451903-30959-1-git-send-email-jianxin.xiong@intel.com>
[not found] ` <20200629185152.GD25301@ziepe.ca>
[not found] ` <MW3PR11MB4555A99038FA0CFC3ED80D3DE56F0@MW3PR11MB4555.namprd11.prod.outlook.com>
[not found] ` <20200630173435.GK25301@ziepe.ca>
2020-06-30 18:46 ` [RFC PATCH v2 0/3] RDMA: add dma-buf support Xiong, Jianxin
2020-06-30 19:17 ` Jason Gunthorpe
2020-06-30 20:08 ` Xiong, Jianxin
2020-07-02 12:27 ` Jason Gunthorpe
2020-07-01 9:03 ` Christian König
2020-07-01 12:07 ` Daniel Vetter
2020-07-01 12:14 ` Daniel Vetter
2020-07-01 12:39 ` Jason Gunthorpe
2020-07-01 12:55 ` Christian König
2020-07-01 15:42 ` Daniel Vetter
2020-07-01 17:15 ` Jason Gunthorpe
2020-07-02 13:10 ` Daniel Vetter
2020-07-02 13:29 ` Jason Gunthorpe
2020-07-02 14:50 ` Christian König
2020-07-02 18:15 ` Daniel Vetter
2020-07-03 12:03 ` Jason Gunthorpe
2020-07-03 12:52 ` Daniel Vetter
2020-07-03 13:14 ` Jason Gunthorpe [this message]
2020-07-03 13:21 ` Christian König
2020-07-07 21:58 ` Xiong, Jianxin
2020-07-08 9:38 ` Christian König
2020-07-08 9:49 ` Daniel Vetter
2020-07-08 14:20 ` Christian König
2020-07-08 14:33 ` Alex Deucher
2020-06-30 18:56 ` Xiong, Jianxin
[not found] ` <1593451903-30959-2-git-send-email-jianxin.xiong@intel.com>
2020-06-30 19:04 ` [RFC PATCH v2 1/3] RDMA/umem: Support importing dma-buf as user memory region Xiong, Jianxin
[not found] ` <1593451903-30959-3-git-send-email-jianxin.xiong@intel.com>
2020-06-30 19:04 ` [RFC PATCH v2 2/3] RDMA/core: Expand the driver method 'reg_user_mr' to support dma-buf Xiong, Jianxin
[not found] ` <1593451903-30959-4-git-send-email-jianxin.xiong@intel.com>
2020-06-30 19:05 ` [RFC PATCH v2 3/3] RDMA/uverbs: Add uverbs command for dma-buf based MR registration Xiong, Jianxin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200703131445.GU25301@ziepe.ca \
--to=jgg@ziepe.ca \
--cc=christian.koenig@amd.com \
--cc=daniel.vetter@intel.com \
--cc=daniel@ffwll.ch \
--cc=dledford@redhat.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=jianxin.xiong@intel.com \
--cc=leon@kernel.org \
--cc=linux-rdma@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).