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path: root/drivers/s390/char/monreader.c
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Diffstat (limited to 'drivers/s390/char/monreader.c')
-rw-r--r--drivers/s390/char/monreader.c140
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;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 02:23:58 +0000