hv: move "client/server_monitor_latency" bus attributes to dev_groups

This moves the "client_monitor_latency" and "server_monitor_latency" bus
attributes to the dev_groups structure, removing the need for it to be
in a temporary structure.

Tested-by: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/channel.c

@@ -70,15 +70,11 @@ void vmbus_get_debug_info(struct vmbus_channel *channel,
 	u8 monitor_offset = (u8)channel->offermsg.monitorid % 32;
 
 	monitorpage = vmbus_connection.monitor_pages[0];
-	debuginfo->servermonitor_latency =
-			monitorpage->latency[monitor_group][monitor_offset];
 	debuginfo->servermonitor_connectionid =
 			monitorpage->parameter[monitor_group]
 					[monitor_offset].connectionid.u.id;
 
 	monitorpage = vmbus_connection.monitor_pages[1];
-	debuginfo->clientmonitor_latency =
-			monitorpage->latency[monitor_group][monitor_offset];
 	debuginfo->clientmonitor_connectionid =
 			monitorpage->parameter[monitor_group]
 					[monitor_offset].connectionid.u.id;

drivers/hv/vmbus_drv.c

@@ -47,9 +47,7 @@ static struct completion probe_event;
 static int irq;
 
 struct hv_device_info {
-	u32 server_monitor_latency;
 	u32 server_monitor_conn_id;
-	u32 client_monitor_latency;
 	u32 client_monitor_conn_id;
 
 	struct hv_dev_port_info inbound;
@@ -75,10 +73,8 @@ static void get_channel_info(struct hv_device *device,
 
 	vmbus_get_debug_info(device->channel, &debug_info);
 
-	info->server_monitor_latency = debug_info.servermonitor_latency;
 	info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
 
-	info->client_monitor_latency = debug_info.clientmonitor_latency;
 	info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
 
 	info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
@@ -151,13 +147,9 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
 	} else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
 		ret = sprintf(buf, "%d\n",
 			       device_info->inbound.bytes_avail_towrite);
-	} else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
-		ret = sprintf(buf, "%d\n", device_info->server_monitor_latency);
 	} else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
 		ret = sprintf(buf, "%d\n",
 			       device_info->server_monitor_conn_id);
-	} else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
-		ret = sprintf(buf, "%d\n", device_info->client_monitor_latency);
 	} else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
 		ret = sprintf(buf, "%d\n",
 			       device_info->client_monitor_conn_id);
@@ -184,6 +176,14 @@ static u32 channel_pending(struct vmbus_channel *channel,
 	return monitor_page->trigger_group[monitor_group].pending;
 }
 
+static u32 channel_latency(struct vmbus_channel *channel,
+			   struct hv_monitor_page *monitor_page)
+{
+	u8 monitor_group = channel_monitor_group(channel);
+	u8 monitor_offset = channel_monitor_offset(channel);
+	return monitor_page->latency[monitor_group][monitor_offset];
+}
+
 static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
 		       char *buf)
 {
@@ -280,6 +280,34 @@ static ssize_t client_monitor_pending_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(client_monitor_pending);
 
+static ssize_t server_monitor_latency_show(struct device *dev,
+					   struct device_attribute *dev_attr,
+					   char *buf)
+{
+	struct hv_device *hv_dev = device_to_hv_device(dev);
+
+	if (!hv_dev->channel)
+		return -ENODEV;
+	return sprintf(buf, "%d\n",
+		       channel_latency(hv_dev->channel,
+				       vmbus_connection.monitor_pages[0]));
+}
+static DEVICE_ATTR_RO(server_monitor_latency);
+
+static ssize_t client_monitor_latency_show(struct device *dev,
+					   struct device_attribute *dev_attr,
+					   char *buf)
+{
+	struct hv_device *hv_dev = device_to_hv_device(dev);
+
+	if (!hv_dev->channel)
+		return -ENODEV;
+	return sprintf(buf, "%d\n",
+		       channel_latency(hv_dev->channel,
+				       vmbus_connection.monitor_pages[1]));
+}
+static DEVICE_ATTR_RO(client_monitor_latency);
+
 static struct attribute *vmbus_attrs[] = {
 	&dev_attr_id.attr,
 	&dev_attr_state.attr,
@@ -289,16 +317,16 @@ static struct attribute *vmbus_attrs[] = {
 	&dev_attr_modalias.attr,
 	&dev_attr_server_monitor_pending.attr,
 	&dev_attr_client_monitor_pending.attr,
+	&dev_attr_server_monitor_latency.attr,
+	&dev_attr_client_monitor_latency.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(vmbus);
 
 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
 static struct device_attribute vmbus_device_attrs[] = {
-	__ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
 	__ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
 
-	__ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
 	__ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
 
 	__ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),

include/linux/hyperv.h

@@ -900,9 +900,7 @@ enum vmbus_channel_state {
 };
 
 struct vmbus_channel_debug_info {
-	u32 servermonitor_latency;
 	u32 servermonitor_connectionid;
-	u32 clientmonitor_latency;
 	u32 clientmonitor_connectionid;
 
 	struct hv_ring_buffer_debug_info inbound;