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[S390] pm: monreader power management callbacks.
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Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Gerald Schaefer authored and Martin Schwidefsky committed Jun 16, 2009
1 parent fb78140 commit 2b1e3e5
Showing 1 changed file with 128 additions and 12 deletions.
140 changes: 128 additions & 12 deletions drivers/s390/char/monreader.c
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Original file line number Diff line number Diff line change
@@ -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"
Expand All @@ -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>
Expand Down Expand Up @@ -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 *
Expand Down Expand Up @@ -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:
Expand All @@ -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);
Expand Down Expand Up @@ -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 *
*****************************************************************************/
Expand All @@ -475,24 +568,41 @@ 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,
&mon_dcss_start, &mon_dcss_end);
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]);

Expand All @@ -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;
Expand All @@ -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;
}
Expand Down

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