mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 10:57:46 +00:00
[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>
This commit is contained in:
parent
fb78140ced
commit
2b1e3e5558
1 changed files with 128 additions and 12 deletions
|
@ -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;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue