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authorDexuan Cui <decui@microsoft.com>2015-08-05 10:52:43 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-05 21:44:29 +0300
commit042ab0313bbb7e776e9510da3f07fb300d08a8ba (patch)
tree8411c0ed72dbcb259277a7b1d5eb718e83ed52a8 /drivers/hv
parentca9357bd26c2f8e7b909321eedd651f52cc30d04 (diff)
downloadlinux-042ab0313bbb7e776e9510da3f07fb300d08a8ba.tar.xz
Drivers: hv: vmbus: add a sysfs attr to show the binding of channel/VP
This is useful to analyze performance issue. Signed-off-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 8c3eaee8c54c..45d6d7a0ed89 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -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);