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

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
...@@ -441,6 +441,43 @@ static ssize_t in_write_bytes_avail_show(struct device *dev, ...@@ -441,6 +441,43 @@ static ssize_t in_write_bytes_avail_show(struct device *dev,
} }
static DEVICE_ATTR_RO(in_write_bytes_avail); 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> */ /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
static struct attribute *vmbus_attrs[] = { static struct attribute *vmbus_attrs[] = {
&dev_attr_id.attr, &dev_attr_id.attr,
...@@ -465,6 +502,7 @@ static struct attribute *vmbus_attrs[] = { ...@@ -465,6 +502,7 @@ static struct attribute *vmbus_attrs[] = {
&dev_attr_in_write_index.attr, &dev_attr_in_write_index.attr,
&dev_attr_in_read_bytes_avail.attr, &dev_attr_in_read_bytes_avail.attr,
&dev_attr_in_write_bytes_avail.attr, &dev_attr_in_write_bytes_avail.attr,
&dev_attr_channel_vp_mapping.attr,
NULL, NULL,
}; };
ATTRIBUTE_GROUPS(vmbus); ATTRIBUTE_GROUPS(vmbus);
......
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