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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xenbus PM events support (was: [PATCH 2/2] Fix hangup after creating checkpoint on Xen.)
On Wed, Feb 16, 2011 at 1:43 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>
> On Tue, 2011-02-15 at 23:20 +0000, Shriram Rajagopalan wrote:
> > The above patch is against upstream/for-linus tree.
>
> In general it is better to pick either a mainline kernel (e.g. the
> master branch from
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git),
> one of the stable-* or next-* branches from xen.git or a specific topic
> branch. The for-* branches are usually just throwaway branches which are
> not necessarily kept up to date or relevant standalone. (in this case I
> think it's ok since it is just 2.6.38-rc1 + a little bit)
>
> > The xen-netfront driver does not have any suspend handler at all, in this
> > tree.
> > I checked other trees (upstream/pvhvm, upstream/xen,
> > upstream/netfront). Same issue.
>
> This patch doesn't appear to touch xen-netfront though?
>
> It looks like the netfront driver only needs to do work on resume, not
> suspend. This is consistent with the explanation of why freeze/suspend
> and thaw/resume are the same under Xen which you gave in an earlier
> mail, isn't it?
>
> A quick "git grep xenbus_driver" doesn't show any of the other frontends
> having a suspend callback either.
>
Which tree are you talking about? xen/next-2.6.32 and xen/next has
netfront_suspend and I think Kazuhiro's patch was against this.
Looking at the netfront_suspend code from next-2.6.32, it simply cancels the
smart poll timers on suspend. And this was introduced by
commit 5473680bdedb7a62e641970119e6e9381a8d80f4
Author: Author: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
in order to fix save/restore when using smart poll timers.
But xen/next-2.6.38 does not have this function. So I dont know why it has been
removed.
> > So, I dont know which tree Kazuhiro's original patch applies to.
> >
> > Shriram
> >
> > On Tue, Feb 15, 2011 at 3:10 PM, Shriram Rajagopalan <rshriram@xxxxxxxxx>
> > wrote:
> > > From: SUZUKI, Kazuhiro <kaz@xxxxxxxxxxxxxx>
> > >
> > > Hi,
> > >
> > > This is a Xen part patch.
>
> Can you improve on this description please.
>
> I meant to respond to this in the initial posting and forgot once the
> thread got sidetracked into what the correct approach is.
>
> My advice to "just pipe the mail into git am" may have been a bit
> misleading, sorry.
>
> In general it's fine to fixup the description and/or minor nits with the
> patch as it passes through your hand. If the changes are significant
> it's useful to acknowledge what you've done, many people add a
> [shriram--improved commit message]
> style tag below their signed off.
>
> In this case the actual patch itself is fine and:
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
>
> Ian.
>
> > >
> > > Thanks,
> > > KAZ
> > >
> > > Signed-off-by: Kenji Wakamiya <wkenji@xxxxxxxxxxxxxx>
> > > Signed-off-by: Kazuhiro Suzuki <kaz@xxxxxxxxxxxxxx>
> > > Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
> > > ---
> > > drivers/xen/xenbus/xenbus_probe.c | 12 ++++++++++--
> > > drivers/xen/xenbus/xenbus_probe.h | 3 ++-
> > > drivers/xen/xenbus/xenbus_probe_frontend.c | 9 +++++++--
> > > include/xen/xenbus.h | 2 +-
> > > 4 files changed, 20 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/xen/xenbus/xenbus_probe.c
> > > b/drivers/xen/xenbus/xenbus_probe.c
> > > index baa65e7..7397695 100644
> > > --- a/drivers/xen/xenbus/xenbus_probe.c
> > > +++ b/drivers/xen/xenbus/xenbus_probe.c
> > > @@ -577,7 +577,7 @@ void xenbus_dev_changed(const char *node, struct
> > > xen_bus_type *bus)
> > > }
> > > EXPORT_SYMBOL_GPL(xenbus_dev_changed);
> > >
> > > -int xenbus_dev_suspend(struct device *dev, pm_message_t state)
> > > +int xenbus_dev_suspend(struct device *dev)
> > > {
> > > int err = 0;
> > > struct xenbus_driver *drv;
> > > @@ -590,7 +590,7 @@ int xenbus_dev_suspend(struct device *dev,
> > > pm_message_t state)
> > > return 0;
> > > drv = to_xenbus_driver(dev->driver);
> > > if (drv->suspend)
> > > - err = drv->suspend(xdev, state);
> > > + err = drv->suspend(xdev);
> > > if (err)
> > > printk(KERN_WARNING
> > > "xenbus: suspend %s failed: %i\n", dev_name(dev),
> > > err);
> > > @@ -642,6 +642,14 @@ int xenbus_dev_resume(struct device *dev)
> > > }
> > > EXPORT_SYMBOL_GPL(xenbus_dev_resume);
> > >
> > > +int xenbus_dev_cancel(struct device *dev)
> > > +{
> > > + /* Do nothing */
> > > + DPRINTK("cancel");
> > > + return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(xenbus_dev_cancel);
> > > +
> > > /* A flag to determine if xenstored is 'ready' (i.e. has started) */
> > > int xenstored_ready = 0;
> > >
> > > diff --git a/drivers/xen/xenbus/xenbus_probe.h
> > > b/drivers/xen/xenbus/xenbus_probe.h
> > > index 2466581..888b990 100644
> > > --- a/drivers/xen/xenbus/xenbus_probe.h
> > > +++ b/drivers/xen/xenbus/xenbus_probe.h
> > > @@ -64,8 +64,9 @@ extern void xenbus_dev_changed(const char *node, struct
> > > xen_bus_type *bus);
> > >
> > > extern void xenbus_dev_shutdown(struct device *_dev);
> > >
> > > -extern int xenbus_dev_suspend(struct device *dev, pm_message_t state);
> > > +extern int xenbus_dev_suspend(struct device *dev);
> > > extern int xenbus_dev_resume(struct device *dev);
> > > +extern int xenbus_dev_cancel(struct device *dev);
> > >
> > > extern void xenbus_otherend_changed(struct xenbus_watch *watch,
> > > const char **vec, unsigned int len,
> > > diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c
> > > b/drivers/xen/xenbus/xenbus_probe_frontend.c
> > > index 5bcc2d6..9ad8868 100644
> > > --- a/drivers/xen/xenbus/xenbus_probe_frontend.c
> > > +++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
> > > @@ -85,6 +85,12 @@ static struct device_attribute
> > > xenbus_frontend_dev_attrs[] = {
> > > __ATTR_NULL
> > > };
> > >
> > > +static struct dev_pm_ops xenbus_pm_ops = {
> > > + .suspend = xenbus_dev_suspend,
> > > + .resume = xenbus_dev_resume,
> > > + .thaw = xenbus_dev_cancel,
> > > +};
> > > +
> > > static struct xen_bus_type xenbus_frontend = {
> > > .root = "device",
> > > .levels = 2, /* device/type/<id> */
> > > @@ -100,8 +106,7 @@ static struct xen_bus_type xenbus_frontend = {
> > > .shutdown = xenbus_dev_shutdown,
> > > .dev_attrs = xenbus_frontend_dev_attrs,
> > >
> > > - .suspend = xenbus_dev_suspend,
> > > - .resume = xenbus_dev_resume,
> > > + .pm = &xenbus_pm_ops,
> > > },
> > > };
> > >
> > > diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
> > > index 7a1d15f..5467369 100644
> > > --- a/include/xen/xenbus.h
> > > +++ b/include/xen/xenbus.h
> > > @@ -92,7 +92,7 @@ struct xenbus_driver {
> > > void (*otherend_changed)(struct xenbus_device *dev,
> > > enum xenbus_state backend_state);
> > > int (*remove)(struct xenbus_device *dev);
> > > - int (*suspend)(struct xenbus_device *dev, pm_message_t state);
> > > + int (*suspend)(struct xenbus_device *dev);
> > > int (*resume)(struct xenbus_device *dev);
> > > int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *);
> > > struct device_driver driver;
> > > --
> > > 1.7.0.4
> > >
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
>
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