[S390] pm: netiucv power management callbacks.

Patch establishes a dummy netiucv device to make sure iucv is notified
about suspend/resume even if netiucv is the only loaded iucv-exploting
module without any real net_device defined.

The PM freeze callback closes all open netiucv connections. Thus the
corresponding iucv path is removed.
The PM thaw/restore callback re-opens previously closed netiucv
connections.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
index aec9e5d3cf4b72ef7830435fccf8c3c708df31b5..fdb02d043d3ed844d8462977888d044797a21086 100644 (file)
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -1,11 +1,15 @@
 /*
  * IUCV network driver
  *
- * Copyright 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ * Copyright IBM Corp. 2001, 2009
  *
- * Sysfs integration and all bugs therein by Cornelia Huck
- * (cornelia.huck@de.ibm.com)
+ * Author(s):
+ *     Original netiucv driver:
+ *             Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ *     Sysfs integration and all bugs therein:
+ *             Cornelia Huck (cornelia.huck@de.ibm.com)
+ *     PM functions:
+ *             Ursula Braun (ursula.braun@de.ibm.com)
  *
  * Documentation used:
  *  the source of the original IUCV driver by:
@@ -149,10 +153,27 @@ PRINT_##importance(header "%02x %02x %02x %02x  %02x %02x %02x %02x  " \
 
 #define PRINTK_HEADER " iucv: "       /* for debugging */
 
+/* dummy device to make sure netiucv_pm functions are called */
+static struct device *netiucv_dev;
+
+static int netiucv_pm_prepare(struct device *);
+static void netiucv_pm_complete(struct device *);
+static int netiucv_pm_freeze(struct device *);
+static int netiucv_pm_restore_thaw(struct device *);
+
+static struct dev_pm_ops netiucv_pm_ops = {
+       .prepare = netiucv_pm_prepare,
+       .complete = netiucv_pm_complete,
+       .freeze = netiucv_pm_freeze,
+       .thaw = netiucv_pm_restore_thaw,
+       .restore = netiucv_pm_restore_thaw,
+};
+
 static struct device_driver netiucv_driver = {
        .owner = THIS_MODULE,
        .name = "netiucv",
        .bus  = &iucv_bus,
+       .pm = &netiucv_pm_ops,
 };
 
 static int netiucv_callback_connreq(struct iucv_path *,
@@ -233,6 +254,7 @@ struct netiucv_priv {
        fsm_instance            *fsm;
         struct iucv_connection  *conn;
        struct device           *dev;
+       int                      pm_state;
 };
 
 /**
@@ -1265,6 +1287,72 @@ static int netiucv_close(struct net_device *dev)
        return 0;
 }
 
+static int netiucv_pm_prepare(struct device *dev)
+{
+       IUCV_DBF_TEXT(trace, 3, __func__);
+       return 0;
+}
+
+static void netiucv_pm_complete(struct device *dev)
+{
+       IUCV_DBF_TEXT(trace, 3, __func__);
+       return;
+}
+
+/**
+ * netiucv_pm_freeze() - Freeze PM callback
+ * @dev:       netiucv device
+ *
+ * close open netiucv interfaces
+ */
+static int netiucv_pm_freeze(struct device *dev)
+{
+       struct netiucv_priv *priv = dev->driver_data;
+       struct net_device *ndev = NULL;
+       int rc = 0;
+
+       IUCV_DBF_TEXT(trace, 3, __func__);
+       if (priv && priv->conn)
+               ndev = priv->conn->netdev;
+       if (!ndev)
+               goto out;
+       netif_device_detach(ndev);
+       priv->pm_state = fsm_getstate(priv->fsm);
+       rc = netiucv_close(ndev);
+out:
+       return rc;
+}
+
+/**
+ * netiucv_pm_restore_thaw() - Thaw and restore PM callback
+ * @dev:       netiucv device
+ *
+ * re-open netiucv interfaces closed during freeze
+ */
+static int netiucv_pm_restore_thaw(struct device *dev)
+{
+       struct netiucv_priv *priv = dev->driver_data;
+       struct net_device *ndev = NULL;
+       int rc = 0;
+
+       IUCV_DBF_TEXT(trace, 3, __func__);
+       if (priv && priv->conn)
+               ndev = priv->conn->netdev;
+       if (!ndev)
+               goto out;
+       switch (priv->pm_state) {
+       case DEV_STATE_RUNNING:
+       case DEV_STATE_STARTWAIT:
+               rc = netiucv_open(ndev);
+               break;
+       default:
+               break;
+       }
+       netif_device_attach(ndev);
+out:
+       return rc;
+}
+
 /**
  * Start transmission of a packet.
  * Called from generic network device layer.
@@ -1731,7 +1819,6 @@ static int netiucv_register_device(struct net_device *ndev)
        struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
        int ret;
 
-
        IUCV_DBF_TEXT(trace, 3, __func__);
 
        if (dev) {
@@ -2100,6 +2187,7 @@ static void __exit netiucv_exit(void)
                netiucv_unregister_device(dev);
        }
 
+       device_unregister(netiucv_dev);
        driver_unregister(&netiucv_driver);
        iucv_unregister(&netiucv_handler, 1);
        iucv_unregister_dbf_views();
@@ -2125,10 +2213,25 @@ static int __init netiucv_init(void)
                IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc);
                goto out_iucv;
        }
-
+       /* establish dummy device */
+       netiucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
+       if (!netiucv_dev) {
+               rc = -ENOMEM;
+               goto out_driver;
+       }
+       dev_set_name(netiucv_dev, "netiucv");
+       netiucv_dev->bus = &iucv_bus;
+       netiucv_dev->parent = iucv_root;
+       netiucv_dev->release = (void (*)(struct device *))kfree;
+       netiucv_dev->driver = &netiucv_driver;
+       rc = device_register(netiucv_dev);
+       if (rc)
+               goto out_driver;
        netiucv_banner();
        return rc;
 
+out_driver:
+       driver_unregister(&netiucv_driver);
 out_iucv:
        iucv_unregister(&netiucv_handler, 1);
 out_dbf: