[S390] pm: monreader power management callbacks.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 128 insertions, 12 deletions

diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index 97e63cf46944..75a8831eebbc 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -1,10 +1,9 @@
 /*
- * drivers/s390/char/monreader.c
- *
  * Character device driver for reading z/VM *MONITOR service records.
  *
- *   Copyright IBM Corp. 2004, 2008
- *   Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
+ * Copyright IBM Corp. 2004, 2009
+ *
+ * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  */
 
 #define KMSG_COMPONENT "monreader"
@@ -22,6 +21,7 @@
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/poll.h>
+#include <linux/device.h>
 #include <net/iucv/iucv.h>
 #include <asm/uaccess.h>
 #include <asm/ebcdic.h>
@@ -78,6 +78,7 @@ static u8 user_data_sever[16] = {
         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 };
 
+static struct device *monreader_device;
 
 /******************************************************************************
  *                             helper functions                               *
@@ -319,11 +320,12 @@ static int mon_open(struct inode *inode, struct file *filp)
                 goto out_path;
         }
         filp->private_data = monpriv;
+        monreader_device->driver_data = monpriv;
         unlock_kernel();
         return nonseekable_open(inode, filp);
 
 out_path:
-        kfree(monpriv->path);
+        iucv_path_free(monpriv->path);
 out_priv:
         mon_free_mem(monpriv);
 out_use:
@@ -341,10 +343,13 @@ static int mon_close(struct inode *inode, struct file *filp)
         /*
          * Close IUCV connection and unregister
          */
-        rc = iucv_path_sever(monpriv->path, user_data_sever);
-        if (rc)
-                pr_warning("Disconnecting the z/VM *MONITOR system service "
-                           "failed with rc=%i\n", rc);
+        if (monpriv->path) {
+                rc = iucv_path_sever(monpriv->path, user_data_sever);
+                if (rc)
+                        pr_warning("Disconnecting the z/VM *MONITOR system "
+                                   "service failed with rc=%i\n", rc);
+                iucv_path_free(monpriv->path);
+        }
 
         atomic_set(&monpriv->iucv_severed, 0);
         atomic_set(&monpriv->iucv_connected, 0);
@@ -452,6 +457,94 @@ static struct miscdevice mon_dev = {
         .minor      = MISC_DYNAMIC_MINOR,
 };
 
+
+/******************************************************************************
+ *                              suspend / resume                              *
+ *****************************************************************************/
+static int monreader_freeze(struct device *dev)
+{
+        struct mon_private *monpriv = dev->driver_data;
+        int rc;
+
+        if (!monpriv)
+                return 0;
+        if (monpriv->path) {
+                rc = iucv_path_sever(monpriv->path, user_data_sever);
+                if (rc)
+                        pr_warning("Disconnecting the z/VM *MONITOR system "
+                                   "service failed with rc=%i\n", rc);
+                iucv_path_free(monpriv->path);
+        }
+        atomic_set(&monpriv->iucv_severed, 0);
+        atomic_set(&monpriv->iucv_connected, 0);
+        atomic_set(&monpriv->read_ready, 0);
+        atomic_set(&monpriv->msglim_count, 0);
+        monpriv->write_index  = 0;
+        monpriv->read_index   = 0;
+        monpriv->path = NULL;
+        return 0;
+}
+
+static int monreader_thaw(struct device *dev)
+{
+        struct mon_private *monpriv = dev->driver_data;
+        int rc;
+
+        if (!monpriv)
+                return 0;
+        rc = -ENOMEM;
+        monpriv->path = iucv_path_alloc(MON_MSGLIM, IUCV_IPRMDATA, GFP_KERNEL);
+        if (!monpriv->path)
+                goto out;
+        rc = iucv_path_connect(monpriv->path, &monreader_iucv_handler,
+                               MON_SERVICE, NULL, user_data_connect, monpriv);
+        if (rc) {
+                pr_err("Connecting to the z/VM *MONITOR system service "
+                       "failed with rc=%i\n", rc);
+                goto out_path;
+        }
+        wait_event(mon_conn_wait_queue,
+                   atomic_read(&monpriv->iucv_connected) ||
+                   atomic_read(&monpriv->iucv_severed));
+        if (atomic_read(&monpriv->iucv_severed))
+                goto out_path;
+        return 0;
+out_path:
+        rc = -EIO;
+        iucv_path_free(monpriv->path);
+        monpriv->path = NULL;
+out:
+        atomic_set(&monpriv->iucv_severed, 1);
+        return rc;
+}
+
+static int monreader_restore(struct device *dev)
+{
+        int rc;
+
+        segment_unload(mon_dcss_name);
+        rc = segment_load(mon_dcss_name, SEGMENT_SHARED,
+                          &mon_dcss_start, &mon_dcss_end);
+        if (rc < 0) {
+                segment_warning(rc, mon_dcss_name);
+                panic("fatal monreader resume error: no monitor dcss\n");
+        }
+        return monreader_thaw(dev);
+}
+
+static struct dev_pm_ops monreader_pm_ops = {
+        .freeze  = monreader_freeze,
+        .thaw    = monreader_thaw,
+        .restore = monreader_restore,
+};
+
+static struct device_driver monreader_driver = {
+        .name = "monreader",
+        .bus  = &iucv_bus,
+        .pm   = &monreader_pm_ops,
+};
+
+
 /******************************************************************************
  *                              module init/exit                              *
  *****************************************************************************/
@@ -475,16 +568,33 @@ static int __init mon_init(void)
                 return rc;
         }
 
+        rc = driver_register(&monreader_driver);
+        if (rc)
+                goto out_iucv;
+        monreader_device = kzalloc(sizeof(struct device), GFP_KERNEL);
+        if (!monreader_device)
+                goto out_driver;
+        dev_set_name(monreader_device, "monreader-dev");
+        monreader_device->bus = &iucv_bus;
+        monreader_device->parent = iucv_root;
+        monreader_device->driver = &monreader_driver;
+        monreader_device->release = (void (*)(struct device *))kfree;
+        rc = device_register(monreader_device);
+        if (rc) {
+                kfree(monreader_device);
+                goto out_driver;
+        }
+
         rc = segment_type(mon_dcss_name);
         if (rc < 0) {
                 segment_warning(rc, mon_dcss_name);
-                goto out_iucv;
+                goto out_device;
         }
         if (rc != SEG_TYPE_SC) {
                 pr_err("The specified *MONITOR DCSS %s does not have the "
                        "required type SC\n", mon_dcss_name);
                 rc = -EINVAL;
-                goto out_iucv;
+                goto out_device;
         }
 
         rc = segment_load(mon_dcss_name, SEGMENT_SHARED,
@@ -492,7 +602,7 @@ static int __init mon_init(void)
         if (rc < 0) {
                 segment_warning(rc, mon_dcss_name);
                 rc = -EINVAL;
-                goto out_iucv;
+                goto out_device;
         }
         dcss_mkname(mon_dcss_name, &user_data_connect[8]);
 
@@ -503,6 +613,10 @@ static int __init mon_init(void)
 
 out:
         segment_unload(mon_dcss_name);
+out_device:
+        device_unregister(monreader_device);
+out_driver:
+        driver_unregister(&monreader_driver);
 out_iucv:
         iucv_unregister(&monreader_iucv_handler, 1);
         return rc;
@@ -512,6 +626,8 @@ static void __exit mon_exit(void)
 {
         segment_unload(mon_dcss_name);
         WARN_ON(misc_deregister(&mon_dev) != 0);
+        device_unregister(monreader_device);
+        driver_unregister(&monreader_driver);
         iucv_unregister(&monreader_iucv_handler, 1);
         return;
 }