From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Serguei Sagalovitch <serguei.sagalovitch-5C7GfCeVMHo@public.gmane.org>
Cc: "Haggai Eran" <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
"Bridgman, John" <John.Bridgman-5C7GfCeVMHo@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org"
<linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org>,
"Kuehling, Felix" <Felix.Kuehling-5C7GfCeVMHo@public.gmane.org>,
"Blinzer, Paul" <Paul.Blinzer-5C7GfCeVMHo@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org"
<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
"Sander, Ben" <ben.sander-5C7GfCeVMHo@public.gmane.org>,
"Suthikulpanit,
Suravee" <Suravee.Suthikulpanit-5C7GfCeVMHo@public.gmane.org>,
"linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Deucher,
Alexander" <Alexander.Deucher-5C7GfCeVMHo@public.gmane.org>,
"Christian König" <christian.koenig-5C7GfCeVMHo@public.gmane.org>,
"Linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<Linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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-bea87ffd19e8-5C7GfCeVMHo@public.gmane.org>
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: 129+ 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
[not found] ` <MWHPR12MB169484839282E2D56124FA02F7B50-Gy0DoCVfaSW4WA4dJ5YXGAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2016-11-22 18:11 ` Dan Williams
[not found] ` <CAPcyv4i_5r2RVuV4F6V3ETbpKsf8jnMyQviZ7Legz3N4-v+9Og-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-22 18:59 ` Serguei Sagalovitch
2016-11-22 20:01 ` Dan Williams
[not found] ` <CAPcyv4htu4gayz_Dpe0pnfLN4v_Kcy-fTx3B-HEfadCHvzJnhA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-22 20:10 ` Daniel Vetter
2016-11-22 20:24 ` Dan Williams
[not found] ` <CAKMK7uGoXAYoazyGLbGU7svVD10WmaBtpko8BpHeNpRhST8F7g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-22 20:35 ` Serguei Sagalovitch
[not found] ` <a99fd9ea-64d8-c5d3-0b96-f96c92369601-5C7GfCeVMHo@public.gmane.org>
2016-11-22 21:03 ` Daniel Vetter
[not found] ` <CAKMK7uF+k5LvcPEHvtdcXQFrpKVbFxwZ32EexoU3rZ9LFhVSow-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-22 21:13 ` Serguei Sagalovitch
2016-11-22 21:21 ` Dan Williams
[not found] ` <CAPcyv4ind0fxek7g25MX=49rDfT5X151tb4=TYudMBmUJFZZNQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-22 22:21 ` Sagalovitch, Serguei
2016-11-23 7:49 ` Daniel Vetter
2016-11-23 8:51 ` Christian König
[not found] ` <2a8a6582-f3de-5cda-0c6e-1c93774147e0-5C7GfCeVMHo@public.gmane.org>
2016-11-23 19:27 ` Serguei Sagalovitch
[not found] ` <20161123074902.ph7a5cmlw3pclugx-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2016-11-23 17:03 ` Dave Hansen
[not found] ` <75a1f44f-c495-7d1e-7e1c-17e89555edba-5C7GfCeVMHo@public.gmane.org>
2016-11-23 17:13 ` Logan Gunthorpe
[not found] ` <45c6e878-bece-7987-aee7-0e940044158c-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-23 17:27 ` Bart Van Assche
2016-11-23 18:40 ` Dan Williams
[not found] ` <CAPcyv4jsgrsQaeewFedUzcD1XLSQ8vQ5Zyr8EoB_5ORUqmL4nQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-23 19:12 ` Jason Gunthorpe
2016-11-23 19:24 ` Serguei Sagalovitch
[not found] ` <eca737c1-415c-bcd4-80b9-628010638051-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-11-23 19:06 ` Serguei Sagalovitch
2016-11-23 19:05 ` Jason Gunthorpe
[not found] ` <20161123190515.GA12146-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-23 19:14 ` Serguei Sagalovitch
[not found] ` <7bc38037-b6ab-943f-59db-6280e16901ab-5C7GfCeVMHo@public.gmane.org>
2016-11-23 19:32 ` Jason Gunthorpe
[not found] ` <20161123193228.GC12146-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-23 19:58 ` Serguei Sagalovitch
[not found] ` <c2c88376-5ba7-37d1-4d3e-592383ebb00a-5C7GfCeVMHo@public.gmane.org>
2016-11-23 20:33 ` Jason Gunthorpe
2016-11-23 21:11 ` Logan Gunthorpe
[not found] ` <dd60bca8-0a35-7a3a-d3ab-b95bc3d9b973-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-23 21:55 ` Jason Gunthorpe
[not found] ` <20161123215510.GA16311-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-23 22:42 ` Dan Williams
[not found] ` <CAPcyv4jVDC=8AbVa9v6LcXm9n8QHgizv_+gQJC4RTd-wtTESWQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-23 23:25 ` Jason Gunthorpe
[not found] ` <20161123232503.GA13965-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-24 9:45 ` Christian König
[not found] ` <a33ec1cd-051f-8a24-0587-68707459c25c-5C7GfCeVMHo@public.gmane.org>
2016-11-24 16:26 ` Jason Gunthorpe
[not found] ` <20161124162620.GC20818-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-24 17:00 ` Serguei Sagalovitch
2016-11-24 17:55 ` Logan Gunthorpe
[not found] ` <5e1de9ee-34f5-136d-a07e-f949d492864f-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-25 13:06 ` Christian König
[not found] ` <c60815a1-aaac-52eb-1714-66abb28bdc01-5C7GfCeVMHo@public.gmane.org>
2016-11-25 16:45 ` Logan Gunthorpe
[not found] ` <209107c7-3098-ca70-7d62-b55021d01faa-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-25 17:20 ` Serguei Sagalovitch
[not found] ` <ea52d962-6c8e-92d9-eb1b-3ace4bf56126-5C7GfCeVMHo@public.gmane.org>
2016-11-25 20:26 ` Felix Kuehling
[not found] ` <fa44af1c-0c8a-7726-5100-a1f74f824a21-5C7GfCeVMHo@public.gmane.org>
2016-11-25 20:48 ` Serguei Sagalovitch
2016-11-24 0:40 ` Sagalovitch, Serguei
[not found] ` <SN1PR12MB0703CE07F4878243164299C4FEB70-z7L1TMIYDg6P/i5UxMCIqAdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2016-11-24 16:24 ` Jason Gunthorpe
2016-11-24 1:25 ` Logan Gunthorpe
[not found] ` <91d28749-bc64-622f-56a1-26c00e6b462a-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-24 16:42 ` Jason Gunthorpe
[not found] ` <20161124164249.GD20818-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-24 18:11 ` Logan Gunthorpe
2016-11-25 7:58 ` Christoph Hellwig
[not found] ` <20161125075817.GA18428-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-11-25 19:41 ` Jason Gunthorpe
[not found] ` <9cc22068-ede8-c1bc-5d8b-cf6224a7ce05-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-25 17:59 ` Serguei Sagalovitch
2016-11-25 13:22 ` Christian König
[not found] ` <3f2d2db3-fb75-2422-2a18-a8497fd5d70e-5C7GfCeVMHo@public.gmane.org>
2016-11-25 17:16 ` Serguei Sagalovitch
[not found] ` <7ff3cf70-b0c3-028e-fea8-c370a1185b65-5C7GfCeVMHo@public.gmane.org>
2016-11-25 19:34 ` Jason Gunthorpe
[not found] ` <20161125193410.GD16504-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-25 19:49 ` Serguei Sagalovitch
[not found] ` <80aae3e6-278e-49af-7d09-bea87ffd19e8-5C7GfCeVMHo@public.gmane.org>
2016-11-25 20:19 ` Jason Gunthorpe [this message]
2016-11-25 23:41 ` Alex Deucher
2016-11-25 19:32 ` Jason Gunthorpe
[not found] ` <20161125193252.GC16504-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-25 20:40 ` Christian König
[not found] ` <a98185d9-ffb1-6469-4272-2d1222600825-ANTagKRnAhcb1SvskN2V4Q@public.gmane.org>
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
[not found] ` <d9e064a0-9c47-3e41-3154-cece8c70a119-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-11-27 14:07 ` Christian König
[not found] ` <0087fba9-7bcb-8bb3-c26e-4ef3e4970c34-5C7GfCeVMHo@public.gmane.org>
2016-11-28 5:31 ` zhoucm1
2016-11-28 14:48 ` Serguei Sagalovitch
[not found] ` <314e9ef7-f60e-bf6b-d488-c585f1ea60e8-5C7GfCeVMHo@public.gmane.org>
2016-11-28 18:36 ` Haggai Eran
2016-11-28 16:57 ` Jason Gunthorpe
[not found] ` <20161128165751.GB28381-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-28 18:19 ` Haggai Eran
[not found] ` <1480357179.19407.13.camel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-11-28 19:02 ` Jason Gunthorpe
[not found] ` <20161128190244.GA21975-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-30 10:45 ` Haggai Eran
[not found] ` <c0ddccf3-52ce-d883-a57a-70d8a1febf85-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-11-30 16:23 ` Jason Gunthorpe
[not found] ` <20161130162353.GA24639-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-11-30 17:28 ` Serguei Sagalovitch
[not found] ` <2560aab2-426c-6e58-cb4f-77ec76e0c941-5C7GfCeVMHo@public.gmane.org>
2016-12-04 7:33 ` Haggai Eran
2016-11-30 18:01 ` Logan Gunthorpe
[not found] ` <5f5b7989-84f5-737e-47c8-831f752d6280-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-12-04 7:42 ` Haggai Eran
[not found] ` <c1ead8a0-6850-fc84-2793-b986f5c1f726-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-04 13:06 ` Stephen Bates
2016-12-04 13:23 ` Stephen Bates
[not found] ` <61a2fb07344aacd81111449d222de66e.squirrel-2RFepEojUI2m/tTznewQxVaTQe2KTcn/@public.gmane.org>
2016-12-05 17:18 ` Jason Gunthorpe
[not found] ` <20161205171830.GB27784-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-05 17:40 ` Dan Williams
[not found] ` <CAPcyv4hdMkXOxj9hUDpnftA7UTGDa498eBugdePp8EWr6S80gA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-12-05 18:02 ` Jason Gunthorpe
[not found] ` <20161205180231.GA28133-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-05 18:08 ` Dan Williams
[not found] ` <CAPcyv4iEXwvtDbZgnWzdKU6uN_sOGmXH1KtW_Nws6kUftJUigQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-12-05 18:39 ` Logan Gunthorpe
[not found] ` <a3a1c239-297d-c091-7758-54acdf00f74e-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-12-05 18:48 ` Dan Williams
[not found] ` <CAPcyv4iVHhOSxPrLMZ53Xw3CK+9cOWn9zEG8smMtqF_LAcKKpg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-12-05 19:14 ` Jason Gunthorpe
[not found] ` <20161205191438.GA20464-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-05 19:27 ` Logan Gunthorpe
[not found] ` <10356964-c454-47fb-7fb3-8bf2a418b11b-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-12-05 19:46 ` Jason Gunthorpe
[not found] ` <20161205194614.GA21132-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-05 19:59 ` Logan Gunthorpe
2016-12-05 20:06 ` Christoph Hellwig
2016-12-06 8:06 ` Stephen Bates
[not found] ` <ac07a73f2601f6ca35cecc83c553feb0.squirrel-2RFepEojUI2m/tTznewQxVaTQe2KTcn/@public.gmane.org>
2016-12-06 16:38 ` Jason Gunthorpe
[not found] ` <20161206163850.GC28066-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-06 16:51 ` Logan Gunthorpe
[not found] ` <ec136c34-417d-8a55-c176-2c1d759a5fb8-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-12-06 17:28 ` Jason Gunthorpe
[not found] ` <20161206172838.GB19318-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-12-06 21:47 ` Logan Gunthorpe
[not found] ` <bedaa7a2-e42d-da83-5c2b-9d639b0397c5-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
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
[not found] ` <f3bb8372-ae2e-2f5e-5505-4ecaddbfb16e-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-28 19:35 ` Serguei Sagalovitch
[not found] ` <0d3d56e2-4d2b-85b7-9487-b7ae2aaea610-5C7GfCeVMHo@public.gmane.org>
2016-11-28 21:36 ` Logan Gunthorpe
[not found] ` <c8c25265-9f59-f3d6-6249-07500e73930e-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2016-11-28 21:55 ` Serguei Sagalovitch
[not found] ` <1ac2f9e7-f1ee-a2c9-0134-ffaa28c706af-5C7GfCeVMHo@public.gmane.org>
2016-11-28 22:24 ` Jason Gunthorpe
2017-01-05 18:39 ` Jerome Glisse
[not found] ` <20170105183927.GA5324-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-01-05 19:01 ` Jason Gunthorpe
2017-01-05 19:54 ` Jerome Glisse
[not found] ` <20170105195424.GB2166-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-01-05 20:07 ` Jason Gunthorpe
2017-01-05 20:19 ` Jerome Glisse
[not found] ` <20170105201935.GC2166-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-01-05 22:42 ` Jason Gunthorpe
[not found] ` <20170105224215.GA3855-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-05 23:23 ` Jerome Glisse
[not found] ` <20170105232352.GB6426-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-01-06 0:30 ` Jason Gunthorpe
[not found] ` <20170106003034.GB4670-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-06 0:41 ` Serguei Sagalovitch
2017-01-06 1:58 ` Jerome Glisse
[not found] ` <20170106015831.GA2226-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-01-06 16:56 ` Serguei Sagalovitch
[not found] ` <f07700d5-211f-d091-2b0b-fbaf03c4a959-5C7GfCeVMHo@public.gmane.org>
2017-01-06 17:37 ` Jerome Glisse
[not found] ` <20170106173722.GB3804-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-01-06 18:26 ` Jason Gunthorpe
2017-01-06 19:12 ` Deucher, Alexander
[not found] ` <20170106182625.GB5724-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-06 22:10 ` Logan Gunthorpe
[not found] ` <2a148b6e-86bc-4c4d-2f22-d733e2cc94cc-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2017-01-12 4:54 ` Stephen Bates
2017-01-12 15:11 ` Jerome Glisse
[not found] ` <20170112151129.GA10942-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-01-12 17:17 ` Jason Gunthorpe
2017-01-13 13:04 ` Christian König
[not found] ` <d5a72e1e5f6d606697dc0027f073fd87.squirrel-2RFepEojUI2m/tTznewQxVaTQe2KTcn/@public.gmane.org>
2017-01-12 22:35 ` Logan Gunthorpe
[not found] ` <20170105190113.GA12587-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-06 15:08 ` Henrique Almeida
2017-10-20 12:36 ` Ludwig Petrosyan
[not found] ` <7f5e0303-f4ea-781a-8dec-74b30990d54f-T5F83Mi6MZE@public.gmane.org>
2017-10-20 15:48 ` Logan Gunthorpe
[not found] ` <be9f2dee-bb37-9e8f-af72-6ee1127ba8d4-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2017-10-22 6:13 ` Petrosyan, Ludwig
2017-10-22 17:19 ` Logan Gunthorpe
2017-10-23 16:08 ` David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6DD00A04EA-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2017-10-23 22:04 ` Logan Gunthorpe
[not found] ` <d61b6829-0515-a809-2a43-c41add4b1594-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2017-10-24 5:58 ` Petrosyan, Ludwig
[not found] ` <1264390131.14701401.1508824699016.JavaMail.zimbra-T5F83Mi6MZE@public.gmane.org>
2017-10-24 14:58 ` David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6DD00A19B9-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2017-10-26 13:28 ` Petrosyan, Ludwig
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