[Xen-devel] [PATCH V2] xen: export device state to sysfs

[Joe Jin <joe.jin@xxxxxxxxxx>]

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

Signed-off-by: Joe Jin <joe.jin@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 Documentation/ABI/stable/sysfs-bus-xen-backend | 9 +++++++++
 drivers/xen/xenbus/xenbus_probe.c              | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-bus-xen-backend 
b/Documentation/ABI/stable/sysfs-bus-xen-backend
index 3d5951c8bf5f..e8b60bd766f7 100644
--- a/Documentation/ABI/stable/sysfs-bus-xen-backend
+++ b/Documentation/ABI/stable/sysfs-bus-xen-backend
@@ -73,3 +73,12 @@ KernelVersion:       3.0
 Contact:       Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
 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@xxxxxxxxxx>
+Description:
+                The state of the device. One of: 'Unknown',
+                'Initialising', 'Initialised', 'Connected', 'Closing',
+                'Closed', 'Reconfiguring', 'Reconfigured'.
diff --git a/drivers/xen/xenbus/xenbus_probe.c 
b/drivers/xen/xenbus/xenbus_probe.c
index f2088838f690..5b471889d723 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -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,
 };
 
-- 
2.15.2 (Apple Git-101.1)


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