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[S390] pm: dcssblk 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:
Gerald Schaefer 2009-06-16 10:30:51 +02:00 committed by Martin Schwidefsky
parent 2b1e3e5558
commit c369527f18
1 changed files with 115 additions and 17 deletions
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132
drivers/s390/block/dcssblk.c
View File

@ -14,10 +14,11 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <asm/extmem.h>
#include <asm/io.h>
#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <asm/extmem.h>
#include <asm/io.h>
#define DCSSBLK_NAME "dcssblk"
#define DCSSBLK_MINORS_PER_DISK 1
@ -939,12 +940,95 @@ dcssblk_check_params(void)
}
}
/*
* Suspend / Resume
*/
static int dcssblk_freeze(struct device *dev)
{
struct dcssblk_dev_info *dev_info;
int rc = 0;
list_for_each_entry(dev_info, &dcssblk_devices, lh) {
switch (dev_info->segment_type) {
case SEG_TYPE_SR:
case SEG_TYPE_ER:
case SEG_TYPE_SC:
if (!dev_info->is_shared)
rc = -EINVAL;
break;
default:
rc = -EINVAL;
break;
}
if (rc)
break;
}
if (rc)
pr_err("Suspend failed because device %s is writeable.\n",
dev_info->segment_name);
return rc;
}
static int dcssblk_restore(struct device *dev)
{
struct dcssblk_dev_info *dev_info;
struct segment_info *entry;
unsigned long start, end;
int rc = 0;
list_for_each_entry(dev_info, &dcssblk_devices, lh) {
list_for_each_entry(entry, &dev_info->seg_list, lh) {
segment_unload(entry->segment_name);
rc = segment_load(entry->segment_name, SEGMENT_SHARED,
&start, &end);
if (rc < 0) {
// TODO in_use check ?
segment_warning(rc, entry->segment_name);
goto out_panic;
}
if (start != entry->start || end != entry->end) {
pr_err("Mismatch of start / end address after "
"resuming device %s\n",
entry->segment_name);
goto out_panic;
}
}
}
return 0;
out_panic:
panic("fatal dcssblk resume error\n");
}
static int dcssblk_thaw(struct device *dev)
{
return 0;
}
static struct dev_pm_ops dcssblk_pm_ops = {
.freeze = dcssblk_freeze,
.thaw = dcssblk_thaw,
.restore = dcssblk_restore,
};
static struct platform_driver dcssblk_pdrv = {
.driver = {
.name = "dcssblk",
.owner = THIS_MODULE,
.pm = &dcssblk_pm_ops,
},
};
static struct platform_device *dcssblk_pdev;
/*
* The init/exit functions.
*/
static void __exit
dcssblk_exit(void)
{
platform_device_unregister(dcssblk_pdev);
platform_driver_unregister(&dcssblk_pdrv);
root_device_unregister(dcssblk_root_dev);
unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
}
@ -954,30 +1038,44 @@ dcssblk_init(void)
{
int rc;
rc = platform_driver_register(&dcssblk_pdrv);
if (rc)
return rc;
dcssblk_pdev = platform_device_register_simple("dcssblk", -1, NULL,
0);
if (IS_ERR(dcssblk_pdev)) {
rc = PTR_ERR(dcssblk_pdev);
goto out_pdrv;
}
dcssblk_root_dev = root_device_register("dcssblk");
if (IS_ERR(dcssblk_root_dev))
return PTR_ERR(dcssblk_root_dev);
if (IS_ERR(dcssblk_root_dev)) {
rc = PTR_ERR(dcssblk_root_dev);
goto out_pdev;
}
rc = device_create_file(dcssblk_root_dev, &dev_attr_add);
if (rc) {
root_device_unregister(dcssblk_root_dev);
return rc;
}
if (rc)
goto out_root;
rc = device_create_file(dcssblk_root_dev, &dev_attr_remove);
if (rc) {
root_device_unregister(dcssblk_root_dev);
return rc;
}
if (rc)
goto out_root;
rc = register_blkdev(0, DCSSBLK_NAME);
if (rc < 0) {
root_device_unregister(dcssblk_root_dev);
return rc;
}
if (rc < 0)
goto out_root;
dcssblk_major = rc;
init_rwsem(&dcssblk_devices_sem);
dcssblk_check_params();
return 0;
out_root:
root_device_unregister(dcssblk_root_dev);
out_pdev:
platform_device_unregister(dcssblk_pdev);
out_pdrv:
platform_driver_unregister(&dcssblk_pdrv);
return rc;
}
module_init(dcssblk_init);