@@ -49,6 +49,14 @@ Contact: Stephen Hemminger <sthemmin@microsoft.com>
Description: This NUMA node to which the VMBUS device is
attached, or -1 if the node is unknown.
+What: /sys/bus/vmbus/devices/<UUID>/dev_num
+Date: Dec 2019
+KernelVersion: 5.5
+Contact: Haiyang Zhang <haiyangz@microsoft.com>
+Description: A number based on the vmbus device offer sequence.
+ Useful for device naming when using Async probing.
+Users: Debugging tools and userspace drivers
+
What: /sys/bus/vmbus/devices/<UUID>/channels/<N>
Date: September. 2017
KernelVersion: 4.14
@@ -214,6 +214,18 @@ static ssize_t numa_node_show(struct device *dev,
static DEVICE_ATTR_RO(numa_node);
#endif
+static ssize_t dev_num_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hv_device *hv_dev = device_to_hv_device(dev);
+
+ if (!hv_dev->channel)
+ return -ENODEV;
+
+ return sprintf(buf, "%d\n", hv_dev->channel->dev_num);
+}
+static DEVICE_ATTR_RO(dev_num);
+
static ssize_t server_monitor_pending_show(struct device *dev,
struct device_attribute *dev_attr,
char *buf)
@@ -598,6 +610,7 @@ static ssize_t driver_override_show(struct device *dev,
#ifdef CONFIG_NUMA
&dev_attr_numa_node.attr,
#endif
+ &dev_attr_dev_num.attr,
&dev_attr_server_monitor_pending.attr,
&dev_attr_client_monitor_pending.attr,
&dev_attr_server_monitor_latency.attr,
It's a number based on the vmbus device offer sequence. Useful for device naming when using Async probing. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> --- Documentation/ABI/stable/sysfs-bus-vmbus | 8 ++++++++ drivers/hv/vmbus_drv.c | 13 +++++++++++++ 2 files changed, 21 insertions(+)