Having the numa_node for a device is useful for userspace drivers
(ie DPDK) and also for diagnosing performance issues. This makes
vmbus similar to pci.
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
---
drivers/hv/vmbus_drv.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index b10fe26c4891..be754b9ad33a 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -208,6 +208,20 @@ static ssize_t modalias_show(struct device *dev,
}
static DEVICE_ATTR_RO(modalias);
+#ifdef CONFIG_NUMA
+static ssize_t numa_node_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->numa_node);
+}
+static DEVICE_ATTR_RO(numa_node);
+#endif
+
static ssize_t server_monitor_pending_show(struct device *dev,
struct device_attribute *dev_attr,
char *buf)
@@ -490,6 +504,9 @@ static struct attribute *vmbus_dev_attrs[] = {
&dev_attr_class_id.attr,
&dev_attr_device_id.attr,
&dev_attr_modalias.attr,
+#ifdef CONFIG_NUMA
+ &dev_attr_numa_node.attr,
+#endif
&dev_attr_server_monitor_pending.attr,
&dev_attr_client_monitor_pending.attr,
&dev_attr_server_monitor_latency.attr,
--
2.18.0
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