From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Serguei Sagalovitch <serguei.sagalovitch@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Deucher, Alexander" <Alexander.Deucher@amd.com>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"Kuehling, Felix" <Felix.Kuehling@amd.com>,
"Bridgman, John" <John.Bridgman@amd.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"Sander, Ben" <ben.sander@amd.com>,
"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>,
"Blinzer, Paul" <Paul.Blinzer@amd.com>,
"Linux-media@vger.kernel.org" <Linux-media@vger.kernel.org>,
"Haggai Eran" <haggaie@mellanox.com>
Subject: Re: Enabling peer to peer device transactions for PCIe devices
Date: Fri, 25 Nov 2016 13:19:39 -0700 [thread overview]
Message-ID: <20161125201939.GJ16504@obsidianresearch.com> (raw)
In-Reply-To: <80aae3e6-278e-49af-7d09-bea87ffd19e8@amd.com>
On Fri, Nov 25, 2016 at 02:49:50PM -0500, Serguei Sagalovitch wrote:
> GPU could perfectly access all VRAM. It is only issue for p2p without
> special interconnect and CPU access. Strictly speaking as long as we
> have "bus address" we could have RDMA but I agreed that for
> RDMA we could/should(?) always "request" CPU address (I hope that we
> could forget about 32-bit application :-)).
At least on x86 if you have a bus address you have a CPU address. All
RDMAable VRAM has to be visible in the BAR.
> BTW/FYI: About CPU access: Some user-level API is mainly handle based
> so there is no need for CPU access by default.
You mean no need for the memory to be virtually mapped into the
process?
Do you expect to RDMA from this kind of API? How will that work?
Jason
next prev parent reply other threads:[~2016-11-25 20:19 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-21 20:36 Enabling peer to peer device transactions for PCIe devices Deucher, Alexander
2016-11-22 18:11 ` Dan Williams
[not found] ` <75a1f44f-c495-7d1e-7e1c-17e89555edba@amd.com>
2016-11-22 20:01 ` Dan Williams
2016-11-22 20:10 ` Daniel Vetter
2016-11-22 20:24 ` Dan Williams
2016-11-22 20:35 ` Serguei Sagalovitch
2016-11-22 21:03 ` Daniel Vetter
2016-11-22 21:21 ` Dan Williams
2016-11-22 22:21 ` Sagalovitch, Serguei
2016-11-23 7:49 ` Daniel Vetter
2016-11-23 8:51 ` Christian König
2016-11-23 19:27 ` Serguei Sagalovitch
2016-11-23 17:03 ` Dave Hansen
2016-11-23 17:13 ` Logan Gunthorpe
2016-11-23 17:27 ` Bart Van Assche
2016-11-23 18:40 ` Dan Williams
2016-11-23 19:12 ` Jason Gunthorpe
2016-11-23 19:24 ` Serguei Sagalovitch
2016-11-23 19:06 ` Serguei Sagalovitch
2016-11-23 19:05 ` Jason Gunthorpe
2016-11-23 19:14 ` Serguei Sagalovitch
2016-11-23 19:32 ` Jason Gunthorpe
[not found] ` <c2c88376-5ba7-37d1-4d3e-592383ebb00a@amd.com>
2016-11-23 20:33 ` Jason Gunthorpe
2016-11-23 21:11 ` Logan Gunthorpe
2016-11-23 21:55 ` Jason Gunthorpe
2016-11-23 22:42 ` Dan Williams
2016-11-23 23:25 ` Jason Gunthorpe
2016-11-24 9:45 ` Christian König
2016-11-24 16:26 ` Jason Gunthorpe
2016-11-24 17:00 ` Serguei Sagalovitch
2016-11-24 17:55 ` Logan Gunthorpe
2016-11-25 13:06 ` Christian König
2016-11-25 16:45 ` Logan Gunthorpe
2016-11-25 17:20 ` Serguei Sagalovitch
2016-11-25 20:26 ` Felix Kuehling
2016-11-25 20:48 ` Serguei Sagalovitch
2016-11-24 0:40 ` Sagalovitch, Serguei
2016-11-24 16:24 ` Jason Gunthorpe
2016-11-24 1:25 ` Logan Gunthorpe
2016-11-24 16:42 ` Jason Gunthorpe
2016-11-24 18:11 ` Logan Gunthorpe
2016-11-25 7:58 ` Christoph Hellwig
2016-11-25 19:41 ` Jason Gunthorpe
2016-11-25 17:59 ` Serguei Sagalovitch
2016-11-25 13:22 ` Christian König
2016-11-25 17:16 ` Serguei Sagalovitch
2016-11-25 19:34 ` Jason Gunthorpe
2016-11-25 19:49 ` Serguei Sagalovitch
2016-11-25 20:19 ` Jason Gunthorpe [this message]
2016-11-25 23:41 ` Alex Deucher
2016-11-25 19:32 ` Jason Gunthorpe
2016-11-25 20:40 ` Christian König
2016-11-25 20:51 ` Felix Kuehling
2016-11-25 21:18 ` Jason Gunthorpe
2016-11-27 8:16 ` Haggai Eran
2016-11-27 14:02 ` Haggai Eran
2016-11-27 14:07 ` Christian König
2016-11-28 5:31 ` zhoucm1
2016-11-28 14:48 ` Serguei Sagalovitch
2016-11-28 18:36 ` Haggai Eran
2016-11-28 16:57 ` Jason Gunthorpe
2016-11-28 18:19 ` Haggai Eran
2016-11-28 19:02 ` Jason Gunthorpe
2016-11-30 10:45 ` Haggai Eran
2016-11-30 16:23 ` Jason Gunthorpe
2016-11-30 17:28 ` Serguei Sagalovitch
2016-12-04 7:33 ` Haggai Eran
2016-11-30 18:01 ` Logan Gunthorpe
2016-12-04 7:42 ` Haggai Eran
2016-12-04 13:06 ` Stephen Bates
2016-12-04 13:23 ` Stephen Bates
2016-12-05 17:18 ` Jason Gunthorpe
2016-12-05 17:40 ` Dan Williams
2016-12-05 18:02 ` Jason Gunthorpe
2016-12-05 18:08 ` Dan Williams
2016-12-05 18:39 ` Logan Gunthorpe
2016-12-05 18:48 ` Dan Williams
2016-12-05 19:14 ` Jason Gunthorpe
2016-12-05 19:27 ` Logan Gunthorpe
2016-12-05 19:46 ` Jason Gunthorpe
2016-12-05 19:59 ` Logan Gunthorpe
2016-12-05 20:06 ` Christoph Hellwig
2016-12-06 8:06 ` Stephen Bates
2016-12-06 16:38 ` Jason Gunthorpe
2016-12-06 16:51 ` Logan Gunthorpe
2016-12-06 17:28 ` Jason Gunthorpe
2016-12-06 21:47 ` Logan Gunthorpe
2016-12-06 22:02 ` Dan Williams
2016-12-06 17:12 ` Christoph Hellwig
2016-12-04 7:53 ` Haggai Eran
2016-11-30 17:10 ` Deucher, Alexander
2016-11-28 18:20 ` Logan Gunthorpe
2016-11-28 19:35 ` Serguei Sagalovitch
2016-11-28 21:36 ` Logan Gunthorpe
2016-11-28 21:55 ` Serguei Sagalovitch
2016-11-28 22:24 ` Jason Gunthorpe
2017-01-05 18:39 ` Jerome Glisse
2017-01-05 19:01 ` Jason Gunthorpe
2017-01-05 19:54 ` Jerome Glisse
2017-01-05 20:07 ` Jason Gunthorpe
2017-01-05 20:19 ` Jerome Glisse
2017-01-05 22:42 ` Jason Gunthorpe
2017-01-05 23:23 ` Jerome Glisse
2017-01-06 0:30 ` Jason Gunthorpe
2017-01-06 0:41 ` Serguei Sagalovitch
2017-01-06 1:58 ` Jerome Glisse
2017-01-06 16:56 ` Serguei Sagalovitch
2017-01-06 17:37 ` Jerome Glisse
2017-01-06 18:26 ` Jason Gunthorpe
2017-01-06 19:12 ` Deucher, Alexander
2017-01-06 22:10 ` Logan Gunthorpe
2017-01-12 4:54 ` Stephen Bates
2017-01-12 15:11 ` Jerome Glisse
2017-01-12 17:17 ` Jason Gunthorpe
2017-01-13 13:04 ` Christian König
2017-01-12 22:35 ` Logan Gunthorpe
2017-01-06 15:08 ` Henrique Almeida
2017-10-20 12:36 ` Ludwig Petrosyan
2017-10-20 15:48 ` Logan Gunthorpe
2017-10-22 6:13 ` Petrosyan, Ludwig
2017-10-22 17:19 ` Logan Gunthorpe
2017-10-23 16:08 ` David Laight
2017-10-23 22:04 ` Logan Gunthorpe
2017-10-24 5:58 ` Petrosyan, Ludwig
2017-10-24 14:58 ` David Laight
2017-10-26 13:28 ` Petrosyan, Ludwig
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