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xen: xenbus PM events support 

Make xenbus frontend device subscribe to PM events
to receive suspend/resume/freeze/thaw/restore
notifications.

Signed-off-by: Kenji Wakamiya <wkenji@jp.fujitsu.com>
Signed-off-by: Kazuhiro Suzuki <kaz@jp.fujitsu.com>
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
[shriram--minor mods and improved commit message]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Kazuhiro SUZUKI 2011-02-18 14:43:07 -08:00 committed by Konrad Rzeszutek Wilk
parent 76ca078328
commit c7853aea57
4 changed files with 20 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/xen/xenbus/xenbus_probe.c
View File

@ -577,7 +577,7 @@ void xenbus_dev_changed(const char *node, struct xen_bus_type *bus)
} }
EXPORT_SYMBOL_GPL(xenbus_dev_changed); 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; int err = 0;
struct xenbus_driver *drv; struct xenbus_driver *drv;
@ -590,7 +590,7 @@ int xenbus_dev_suspend(struct device *dev, pm_message_t state)
return 0; return 0;
drv = to_xenbus_driver(dev->driver); drv = to_xenbus_driver(dev->driver);
if (drv->suspend) if (drv->suspend)
err = drv->suspend(xdev, state); err = drv->suspend(xdev);
if (err) if (err)
printk(KERN_WARNING printk(KERN_WARNING
"xenbus: suspend %s failed: %i\n", dev_name(dev), err); "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); 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) */ /* A flag to determine if xenstored is 'ready' (i.e. has started) */
int xenstored_ready = 0; int xenstored_ready = 0;

3
drivers/xen/xenbus/xenbus_probe.h
View File

@ -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 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_resume(struct device *dev);
extern int xenbus_dev_cancel(struct device *dev);
extern void xenbus_otherend_changed(struct xenbus_watch *watch, extern void xenbus_otherend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len, const char **vec, unsigned int len,

9
drivers/xen/xenbus/xenbus_probe_frontend.c
View File

@ -85,6 +85,12 @@ static struct device_attribute xenbus_frontend_dev_attrs[] = {
__ATTR_NULL __ATTR_NULL
}; };
static const 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 = { static struct xen_bus_type xenbus_frontend = {
.root = "device", .root = "device",
.levels = 2, /* device/type/<id> */ .levels = 2, /* device/type/<id> */
@ -100,8 +106,7 @@ static struct xen_bus_type xenbus_frontend = {
.shutdown = xenbus_dev_shutdown, .shutdown = xenbus_dev_shutdown,
.dev_attrs = xenbus_frontend_dev_attrs, .dev_attrs = xenbus_frontend_dev_attrs,
.suspend = xenbus_dev_suspend, .pm = &xenbus_pm_ops,
.resume = xenbus_dev_resume,
}, },
}; };

2
include/xen/xenbus.h
View File

@ -92,7 +92,7 @@ struct xenbus_driver {
void (*otherend_changed)(struct xenbus_device *dev, void (*otherend_changed)(struct xenbus_device *dev,
enum xenbus_state backend_state); enum xenbus_state backend_state);
int (*remove)(struct xenbus_device *dev); 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 (*resume)(struct xenbus_device *dev);
int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *); int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *);
struct device_driver driver; struct device_driver driver;