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xen: export device state to sysfs 

Export device state to sysfs to allow for easier get device state.

Signed-off-by: Joe Jin <joe.jin@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
hifive-unleashed-5.1
Joe Jin 2018-08-28 07:56:08 -07:00 committed by Boris Ostrovsky
parent b2d7a075a1
commit 076e2cedd6
2 changed files with 18 additions and 0 deletions
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9
Documentation/ABI/stable/sysfs-bus-xen-backend
View File

@ -73,3 +73,12 @@ KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of sectors written by the frontend.
What: /sys/bus/xen-backend/devices/*/state
Date: August 2018
KernelVersion: 4.19
Contact: Joe Jin <joe.jin@oracle.com>
Description:
The state of the device. One of: 'Unknown',
'Initialising', 'Initialised', 'Connected', 'Closing',
'Closed', 'Reconfiguring', 'Reconfigured'.

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

@ -402,10 +402,19 @@ static ssize_t modalias_show(struct device *dev,
}
static DEVICE_ATTR_RO(modalias);
static ssize_t state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n",
xenbus_strstate(to_xenbus_device(dev)->state));
}
static DEVICE_ATTR_RO(state);
static struct attribute *xenbus_dev_attrs[] = {
&dev_attr_nodename.attr,
&dev_attr_devtype.attr,
&dev_attr_modalias.attr,
&dev_attr_state.attr,
NULL,
};