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[S390] pm: memory hotplug 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>
This commit is contained in:
Gerald Schaefer
2009-06-16 10:30:48 +02:00
committed by Martin Schwidefsky
parent 4b214a0c77
commit 0399790498
2 changed files with 40 additions and 6 deletions
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42
drivers/s390/char/sclp_cmd.c
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@@ -1,9 +1,8 @@
/*
* drivers/s390/char/sclp_cmd.c
* Copyright IBM Corp. 2007, 2009
*
* Copyright IBM Corp. 2007
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#define KMSG_COMPONENT "sclp_cmd"
@@ -12,11 +11,13 @@
#include <linux/completion.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/memory.h>
#include <linux/platform_device.h>
#include <asm/chpid.h>
#include <asm/sclp.h>
#include <asm/setup.h>
@@ -292,6 +293,7 @@ static DEFINE_MUTEX(sclp_mem_mutex);
static LIST_HEAD(sclp_mem_list);
static u8 sclp_max_storage_id;
static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
static int sclp_mem_state_changed;
struct memory_increment {
struct list_head list;
@@ -450,6 +452,8 @@ static int sclp_mem_notifier(struct notifier_block *nb,
rc = -EINVAL;
break;
}
if (!rc)
sclp_mem_state_changed = 1;
mutex_unlock(&sclp_mem_mutex);
return rc ? NOTIFY_BAD : NOTIFY_OK;
}
@@ -525,6 +529,14 @@ static void __init insert_increment(u16 rn, int standby, int assigned)
list_add(&new_incr->list, prev);
}
static int sclp_mem_freeze(struct device *dev)
{
if (!sclp_mem_state_changed)
return 0;
pr_err("Memory hotplug state changed, suspend refused.\n");
return -EPERM;
}
struct read_storage_sccb {
struct sccb_header header;
u16 max_id;
@@ -534,8 +546,20 @@ struct read_storage_sccb {
u32 entries[0];
} __packed;
static struct dev_pm_ops sclp_mem_pm_ops = {
.freeze = sclp_mem_freeze,
};
static struct platform_driver sclp_mem_pdrv = {
.driver = {
.name = "sclp_mem",
.pm = &sclp_mem_pm_ops,
},
};
static int __init sclp_detect_standby_memory(void)
{
struct platform_device *sclp_pdev;
struct read_storage_sccb *sccb;
int i, id, assigned, rc;
@@ -588,7 +612,17 @@ static int __init sclp_detect_standby_memory(void)
rc = register_memory_notifier(&sclp_mem_nb);
if (rc)
goto out;
rc = platform_driver_register(&sclp_mem_pdrv);
if (rc)
goto out;
sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
if (rc)
goto out_driver;
sclp_add_standby_memory();
goto out;
out_driver:
platform_driver_unregister(&sclp_mem_pdrv);
out:
free_page((unsigned long) sccb);
return rc;