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xen-devel
Re: [Xen-devel] [PATCH] Add device-path command.
On Tue, 07 Apr 2009 16:29:05 +0900
Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx> wrote:
> On Mon, 6 Apr 2009 15:06:00 +0100
> "Daniel P. Berrange" <berrange@xxxxxxxxxx> wrote:
>
> > On Mon, Apr 06, 2009 at 05:03:37PM +0900, Yuji Shimada wrote:
> > > This patch adds device-path command that converts SBDF into device
> > > path.
> >
> > [snip]
> >
> > > diff -r 5a60eb7fad79 tools/misc/device-path
> > > --- /dev/null Thu Jan 01 00:00:00 1970 +0000
> > > +++ b/tools/misc/device-path Mon Apr 06 16:30:11 2009 +0900
> >
> >
> > [snip]
> >
> > > +SYSFS_ACPI_DEVS_PATH = '/firmware/acpi/namespace/ACPI/_SB'
> > > +
> > > +def find_hid_uid(dom, b, d, f):
> > > + sb_path = find_sysfs_mnt() + SYSFS_ACPI_DEVS_PATH
> > > + obj_list = os.listdir(sb_path)
> > > + for obj in obj_list:
> > > + obj_path = sb_path + '/' + obj.strip() + '/'
> > > + if os.path.exists(obj_path + 'seg') and \
> > > + os.path.exists(obj_path + 'bbn'):
> > > + seg = open(obj_path + 'seg').read()
> > > + bbn = open(obj_path + 'bbn').read()
> > > + if int(seg) == dom and int(bbn) == b:
> > > + hid = open(obj_path + 'hid').read()
> > > + if os.path.exists(obj_path + 'uid') is False:
> > > + path_str = hid.strip()
> > > + else:
> > > + uid = open(obj_path + 'uid').read()
> > > + path_str = hid.strip() + ':' + uid.strip()
> > > + return path_str
> > > + return None
> >
> > I don't know how critical this piece of code is to the overall functionality
> > in this tool, but be warned that the path being used here was removed from
> > sysfs in upstream kernel quite a while ago
> >
> > To quote an old copy of Documentation/feature-removal-schedule.txt
> >
> > What: /sys/firmware/acpi/namespace
> > When: 2.6.21
> > Why: The ACPI namespace is effectively the symbol list for
> > the BIOS. The device names are completely arbitrary
> > and have no place being exposed to user-space.
> >
> > For those interested in the BIOS ACPI namespace,
> > the BIOS can be extracted and disassembled with acpidump
> > and iasl as documented in the pmtools package here:
> > http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/utils
> >
>
> It is difficult for users to get device path of particular device.
> So I made this command that converts SBDF into device path.
>
> SBDF of devices can be changed at boot time. But device path is not
> changed at boot time.
> I have already added the function to specify guest passthrough device
> by device path with "guestdev" boot parameter.
> The linux-2.6.18-xen kernel changeset is the following.
>
> # changeset fad85221407bf32df2574bca54cba730748343a2
> # changeset 2fdc121e9b5d76464b3efd47d711c58253ef6348
> # changeset cfb171ddbb333df9671a1da62e40122a56213ab4
> # changeset 79e82ae1bad02c0dfb504db3153599e52a0affb3
Sorry, above changesets are wrong.
They are correct changesets.
# changeset 765 : fad85221407bf32df2574bca54cba730748343a2
# changeset 766 : 2fdc121e9b5d76464b3efd47d711c58253ef6348
# changeset 767 : 78d81e85e8cd8a0a26bc9b760c67d435341f43f8
# changeset 768 : cfb171ddbb333df9671a1da62e40122a56213ab4
Thanks,
--
Yuji Shimada
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