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authorStephen Hemminger <stephen@networkplumber.org>2018-07-28 21:58:48 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-29 08:09:56 +0200
commit7ceb1c37533e2298797188087796dd44931d86af (patch)
tree47884db68d2b080bf3bfb87c33b10ec6809a6af3
parent9d9c9656871cd9fc1d03a2b4f47a278d54c6d03d (diff)
Drivers: hv: vmbus: add numa_node to sysfs
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 <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--Documentation/ABI/stable/sysfs-bus-vmbus7
-rw-r--r--drivers/hv/vmbus_drv.c17
2 files changed, 24 insertions, 0 deletions
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 <kys@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 <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>/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,