From: Stephen Hemminger <step...@networkplumber.org>
Being able to find the numa_node for a device is useful for userspace
drivers (DPDK) and also for diagnosing performance issues. This makes
vmbus similar to pci.
Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
Documentation/ABI/stable/sysfs-bus-vmbus | 7 +++++++
drivers/hv/vmbus_drv.c | 17 +++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/Documentation/ABI/stable/sysfs-bus-vmbus
b/Documentation/ABI/stable/sysfs-bus-vmbus
index 3eaffbb2d468..3fed8fdb873d 100644
--- a/Documentation/ABI/stable/sysfs-bus-vmbus
+++ b/Documentation/ABI/stable/sysfs-bus-vmbus
@@ -42,6 +42,13 @@ Contact: K. Y. Srinivasan <k...@microsoft.com>
Description: The 16 bit vendor ID of the device
Users: tools/hv/lsvmbus and user level RDMA libraries
+What: /sys/bus/vmbus/devices/<UUID>/numa_node
+Date: Jul 2018
+KernelVersion: 4.19
+Contact: Stephen Hemminger <sthem...@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>/channels/<N>
Date: September. 2017
KernelVersion: 4.14
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index db145e1a7049..b1b548a21f91 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -210,6 +210,20 @@ 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)
@@ -492,6 +506,9 @@ 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,
--
2.17.1
