From: Ross Philipson <ross.philipson@gmail.com>
To: "Jürgen Groß" <jgross@suse.com>,
"George Dunlap" <george.dunlap@eu.citrix.com>,
"Ian Jackson" <Ian.Jackson@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>,
Ian Campbell <ian.campbell@citrix.com>,
Chunyan Liu <cyliu@suse.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
Jim Fehlig <jfehlig@suse.com>, Simon Cao <caobosimon@gmail.com>
Subject: Re: [PATCH V4 3/7] libxl: add pvusb API
Date: Wed, 17 Jun 2015 09:48:01 -0400 [thread overview]
Message-ID: <55817A91.9060209@gmail.com> (raw)
In-Reply-To: <5580F177.20702@suse.com>
On 06/17/2015 12:03 AM, Jürgen Groß wrote:
> On 06/16/2015 06:51 PM, Ross Philipson wrote:
>> On 06/16/2015 12:39 PM, George Dunlap wrote:
>>> On 06/16/2015 05:32 PM, Ian Jackson wrote:
>>>> I have just discovered that the value used in /dev/disk/by-path is not
>>>> from sysfs, or at least, not directly.
>>>>
>>>> udev cobbles it together with a bunch of string mangling, from
>>>> information mostly from sysfs. There is no corresponding thing for
>>>> usb devices.
>>>>
>>>> So Linux, the kernel, does not actually provide a stable device name
>>>> string. This is obviously absurd, but I think fixing it is out of
>>>> scope.
>>>>
>>>> I suggest we provide a facility to allow a user to specify a fnmatch
>>>> glob pattern to be applied to the sysfs path. That way when they see
>>>> their device is
>>>> /devices/pci0000:00/0000:00:1d.7/usb1/1-1
>>>> they can write
>>>> /devices/pci0000:00/0000:00:1d.7/usb*/*-1
>>>> which will match exactly and only the right thing.
>>>
>>> What about Juergen's system that has two usbN directories in a single
>>> pci node?
>>>
>>> Quoting:
>>> ---
>>> Hmm, perhaps. On my system I've got:
>>>
>>> /sys/devices/pci0000:00/0000:00:14.0/usb3/
>>> /sys/devices/pci0000:00/0000:00:14.0/usb4/
>>>
>>> So two busses on one pci bus address. Are usb3 and usb4 always in this
>>> order or are they sometimes just numbered the other way round?
>>> ---
>>>
>>> Assuming that usb3 and usb4 are actually distinct busses, and they might
>>> both have something plugged into port; in which case a glob like this:
>>>
>>> devices/pci0000:00/0000:00:14.0/usb*/*-1
>>>
>>> Might match both of the following:
>>>
>>> /sys/devices/pci0000:00/0000:00:14.0/usb3/3-1
>>> /sys/devices/pci0000:00/0000:00:14.0/usb4/4-1
>>
>> Is that an xHCI host controller? If so that might be how the system
>> represents the 2 logical (USB2/USB3) root hubs - each as its own
>> separate bus.
>
> See my other reply: this is the case. So Ian's suggestion would still
> work.
Ack, saw it, thanks.
>
>
> Juergen
>
--
Ross Philipson
next prev parent reply other threads:[~2015-06-17 13:48 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 3:20 [PATCH V4 0/7] xen pvusb toolstack work Chunyan Liu
2015-06-10 3:20 ` [PATCH V4 1/7] libxl: export some functions for pvusb use Chunyan Liu
2015-06-11 16:08 ` Ian Jackson
2015-06-11 16:28 ` Wei Liu
2015-06-12 15:14 ` Ian Jackson
2015-06-10 3:20 ` [PATCH V4 2/7] libxl_read_file_contents: add new entry to read sysfs file Chunyan Liu
2015-06-11 16:16 ` Ian Jackson
2015-06-12 7:00 ` Chun Yan Liu
2015-06-12 15:11 ` Ian Jackson
2015-06-10 3:20 ` [PATCH V4 3/7] libxl: add pvusb API Chunyan Liu
2015-06-11 15:00 ` Juergen Gross
2015-06-11 16:07 ` Ian Jackson
2015-06-11 16:42 ` Ian Jackson
2015-06-12 7:39 ` Chun Yan Liu
2015-06-12 8:06 ` Chun Yan Liu
2015-06-12 11:22 ` Ian Jackson
2015-06-15 14:17 ` George Dunlap
2015-06-15 14:25 ` Jürgen Groß
2015-06-15 14:34 ` George Dunlap
2015-06-15 18:26 ` Juergen Gross
2015-06-16 10:30 ` George Dunlap
2015-06-16 10:51 ` Juergen Gross
2015-06-16 11:11 ` George Dunlap
2015-06-16 11:19 ` Juergen Gross
2015-06-16 11:23 ` George Dunlap
2015-06-16 11:44 ` Ian Jackson
2015-06-17 11:24 ` Ian Campbell
2015-06-18 11:50 ` George Dunlap
2015-06-18 12:08 ` George Dunlap
2015-06-18 13:03 ` Juergen Gross
2015-06-22 13:29 ` Proposed plan for libxl USB interface (was Re: [PATCH V4 3/7] libxl: add pvusb API) George Dunlap
2015-06-22 14:14 ` Juergen Gross
2015-06-22 14:22 ` Ian Jackson
2015-06-23 2:42 ` Chun Yan Liu
2015-06-23 2:43 ` Chun Yan Liu
2015-06-23 2:44 ` Chun Yan Liu
2015-06-16 10:41 ` [PATCH V4 3/7] libxl: add pvusb API Ian Jackson
2015-06-16 10:56 ` Jürgen Groß
2015-06-16 11:03 ` George Dunlap
2015-06-16 11:10 ` Ian Jackson
2015-06-16 11:25 ` Juergen Gross
2015-06-16 11:45 ` George Dunlap
2015-06-16 12:02 ` Ian Jackson
2015-06-16 13:19 ` George Dunlap
2015-06-16 13:32 ` Juergen Gross
2015-06-16 13:37 ` [PATCH V4 3/7] libxl: add pvusb API [and 1 more messages] Ian Jackson
2015-06-16 14:41 ` George Dunlap
2015-06-16 15:58 ` Sander Eikelenboom
2015-06-16 15:59 ` Ian Jackson
2015-06-16 16:34 ` George Dunlap
2015-06-17 3:59 ` Juergen Gross
2015-06-17 10:27 ` George Dunlap
2015-06-18 6:24 ` Chun Yan Liu
2015-06-16 11:45 ` [PATCH V4 3/7] libxl: add pvusb API Ian Jackson
2015-06-16 13:06 ` Juergen Gross
2015-06-16 13:09 ` George Dunlap
2015-06-16 13:23 ` Juergen Gross
2015-06-16 13:29 ` George Dunlap
2015-06-16 13:49 ` Juergen Gross
2015-06-16 14:06 ` George Dunlap
2015-06-16 14:20 ` Juergen Gross
2015-06-16 14:37 ` George Dunlap
2015-06-17 11:34 ` Ian Campbell
2015-06-17 11:40 ` Juergen Gross
2015-06-18 6:20 ` Chun Yan Liu
2015-06-18 7:02 ` Juergen Gross
2015-06-18 8:50 ` Ian Campbell
2015-06-18 13:02 ` Juergen Gross
2015-06-16 15:38 ` George Dunlap
2015-06-16 11:01 ` George Dunlap
2015-06-16 11:12 ` Ian Jackson
2015-06-16 11:21 ` George Dunlap
2015-06-16 16:32 ` Ian Jackson
2015-06-16 16:39 ` George Dunlap
2015-06-16 16:51 ` Ross Philipson
2015-06-17 4:03 ` Jürgen Groß
2015-06-17 13:48 ` Ross Philipson [this message]
2015-06-15 17:47 ` George Dunlap
2015-06-23 10:18 ` Chun Yan Liu
2015-06-23 11:29 ` George Dunlap
2015-06-24 2:26 ` Chun Yan Liu
2015-06-10 3:20 ` [PATCH V4 4/7] libxl: add libxl_device_usb_assignable_list API Chunyan Liu
2015-06-10 3:20 ` [PATCH V4 5/7] xl: add pvusb commands Chunyan Liu
2015-06-12 7:37 ` Juergen Gross
2015-06-12 8:03 ` Chun Yan Liu
2015-06-12 8:22 ` Juergen Gross
2015-06-10 3:20 ` [PATCH V4 6/7] xl: add usb-assignable-list command Chunyan Liu
2015-06-10 3:20 ` [PATCH V4 7/7] domcreate: support pvusb in configuration file Chunyan Liu
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