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Message-ID: <20161206163850.GC28066@obsidianresearch.com>
Date: Tue, 6 Dec 2016 09:38:50 -0700
From: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To: Stephen Bates <sbates@...thlin.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
Logan Gunthorpe <logang@...tatee.com>,
Haggai Eran <haggaie@...lanox.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
"christian.koenig@....com" <christian.koenig@....com>,
"Suravee.Suthikulpanit@....com" <suravee.suthikulpanit@....com>,
"John.Bridgman@....com" <john.bridgman@....com>,
"Alexander.Deucher@....com" <alexander.deucher@....com>,
"Linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Max Gurtovoy <maxg@...lanox.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"serguei.sagalovitch@....com" <serguei.sagalovitch@....com>,
"Paul.Blinzer@....com" <paul.blinzer@....com>,
"Felix.Kuehling@....com" <felix.kuehling@....com>,
"ben.sander@....com" <ben.sander@....com>
Subject: Re: Enabling peer to peer device transactions for PCIe devices
> > I'm not opposed to mapping /dev/nvmeX. However, the lookup is trivial
> > to accomplish in sysfs through /sys/dev/char to find the sysfs path of the
> > device-dax instance under the nvme device, or if you already have the nvme
> > sysfs path the dax instance(s) will appear under the "dax" sub-directory.
>
> Personally I think mapping the dax resource in the sysfs tree is a nice
> way to do this and a bit more intuitive than mapping a /dev/nvmeX.
It is still not at all clear to me what userpsace is supposed to do
with this on nvme.. How is the CMB usable from userspace?
Jason
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