Re: [Xen-devel] [PATCH] Add device-path command.

[Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>]

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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel