1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 01687559dc06..4b0c85acb0f0 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -778,6 +778,68 @@ struct fc_function_template zfcp_transport_functions = {
         .disable_target_scan = 1,
 };
 
+#define ZFCP_DEFINE_LATENCY_ATTR(_name)                                 \
+static ssize_t                                                          \
+zfcp_sysfs_unit_##_name##_latency_show(struct device *dev,              \
+                                       struct device_attribute *attr,   \
+                                       char *buf) {                     \
+        struct scsi_device *sdev = to_scsi_device(dev);                 \
+        struct zfcp_unit *unit = sdev->hostdata;                        \
+        struct zfcp_latencies *lat = &unit->latencies;                  \
+        struct zfcp_adapter *adapter = unit->port->adapter;             \
+        unsigned long flags;                                            \
+        unsigned long long fsum, fmin, fmax, csum, cmin, cmax, cc;      \
+                                                                        \
+        spin_lock_irqsave(&lat->lock, flags);                           \
+        fsum = lat->_name.fabric.sum * adapter->timer_ticks;            \
+        fmin = lat->_name.fabric.min * adapter->timer_ticks;            \
+        fmax = lat->_name.fabric.max * adapter->timer_ticks;            \
+        csum = lat->_name.channel.sum * adapter->timer_ticks;           \
+        cmin = lat->_name.channel.min * adapter->timer_ticks;           \
+        cmax = lat->_name.channel.max * adapter->timer_ticks;           \
+        cc  = lat->_name.counter;                                       \
+        spin_unlock_irqrestore(&lat->lock, flags);                      \
+                                                                        \
+        do_div(fsum, 1000);                                             \
+        do_div(fmin, 1000);                                             \
+        do_div(fmax, 1000);                                             \
+        do_div(csum, 1000);                                             \
+        do_div(cmin, 1000);                                             \
+        do_div(cmax, 1000);                                             \
+                                                                        \
+        return sprintf(buf, "%llu %llu %llu %llu %llu %llu %llu\n",     \
+                       fmin, fmax, fsum, cmin, cmax, csum, cc);         \
+}                                                                       \
+static ssize_t                                                          \
+zfcp_sysfs_unit_##_name##_latency_store(struct device *dev,             \
+                                        struct device_attribute *attr,  \
+                                        const char *buf, size_t count)  \
+{                                                                       \
+        struct scsi_device *sdev = to_scsi_device(dev);                 \
+        struct zfcp_unit *unit = sdev->hostdata;                        \
+        struct zfcp_latencies *lat = &unit->latencies;                  \
+        unsigned long flags;                                            \
+                                                                        \
+        spin_lock_irqsave(&lat->lock, flags);                           \
+        lat->_name.fabric.sum = 0;                                      \
+        lat->_name.fabric.min = 0xFFFFFFFF;                             \
+        lat->_name.fabric.max = 0;                                      \
+        lat->_name.channel.sum = 0;                                     \
+        lat->_name.channel.min = 0xFFFFFFFF;                            \
+        lat->_name.channel.max = 0;                                     \
+        lat->_name.counter = 0;                                         \
+        spin_unlock_irqrestore(&lat->lock, flags);                      \
+                                                                        \
+        return (ssize_t) count;                                         \
+}                                                                       \
+static DEVICE_ATTR(_name##_latency, S_IWUSR | S_IRUGO,                  \
+                   zfcp_sysfs_unit_##_name##_latency_show,              \
+                   zfcp_sysfs_unit_##_name##_latency_store);
+
+ZFCP_DEFINE_LATENCY_ATTR(read);
+ZFCP_DEFINE_LATENCY_ATTR(write);
+ZFCP_DEFINE_LATENCY_ATTR(cmd);
+
 /**
  * ZFCP_DEFINE_SCSI_ATTR
  * @_name:   name of show attribute
@@ -808,6 +870,9 @@ static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
         &dev_attr_fcp_lun,
         &dev_attr_wwpn,
         &dev_attr_hba_id,
+        &dev_attr_read_latency,
+        &dev_attr_write_latency,
+        &dev_attr_cmd_latency,
         NULL
 };