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Commit 7ceb1c37 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Greg Kroah-Hartman
Browse files

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: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9d9c9656

Documentation/ABI/stable/sysfs-bus-vmbus

+7 −0
Original line number Diff line number Diff line
@@ -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

drivers/hv/vmbus_drv.c

+17 −0
Original line number Diff line number Diff line
@@ -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,