Commit 042ab031 authored by Dexuan Cui's avatar Dexuan Cui Committed by Greg Kroah-Hartman
Browse files

Drivers: hv: vmbus: add a sysfs attr to show the binding of channel/VP 



This is useful to analyze performance issue.

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ca9357bd

drivers/hv/vmbus_drv.c

+38 −0
Original line number Diff line number Diff line
@@ -441,6 +441,43 @@ static ssize_t in_write_bytes_avail_show(struct device *dev, 
}

static DEVICE_ATTR_RO(in_write_bytes_avail);



static ssize_t channel_vp_mapping_show(struct device *dev,

				       struct device_attribute *dev_attr,

				       char *buf)

{

	struct hv_device *hv_dev = device_to_hv_device(dev);

	struct vmbus_channel *channel = hv_dev->channel, *cur_sc;

	unsigned long flags;

	int buf_size = PAGE_SIZE, n_written, tot_written;

	struct list_head *cur;



	if (!channel)

		return -ENODEV;



	tot_written = snprintf(buf, buf_size, "%u:%u\n",

		channel->offermsg.child_relid, channel->target_cpu);



	spin_lock_irqsave(&channel->lock, flags);



	list_for_each(cur, &channel->sc_list) {

		if (tot_written >= buf_size - 1)

			break;



		cur_sc = list_entry(cur, struct vmbus_channel, sc_list);

		n_written = scnprintf(buf + tot_written,

				     buf_size - tot_written,

				     "%u:%u\n",

				     cur_sc->offermsg.child_relid,

				     cur_sc->target_cpu);

		tot_written += n_written;

	}



	spin_unlock_irqrestore(&channel->lock, flags);



	return tot_written;

}

static DEVICE_ATTR_RO(channel_vp_mapping);



/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */

static struct attribute *vmbus_attrs[] = {

	&dev_attr_id.attr,
@@ -465,6 +502,7 @@ static struct attribute *vmbus_attrs[] = { 
	&dev_attr_in_write_index.attr,

	&dev_attr_in_read_bytes_avail.attr,

	&dev_attr_in_write_bytes_avail.attr,

	&dev_attr_channel_vp_mapping.attr,

	NULL,

};

ATTRIBUTE_GROUPS(vmbus);