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Diffstat (limited to 'arch/s390/mm/cmm.c')
-rw-r--r--arch/s390/mm/cmm.c61
1 files changed, 50 insertions, 11 deletions
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index ff58779bf7e9..76a3637b88e0 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -18,6 +18,7 @@
#include <linux/swap.h>
#include <linux/kthread.h>
#include <linux/oom.h>
+#include <linux/suspend.h>
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
@@ -44,6 +45,7 @@ static volatile long cmm_pages_target;
static volatile long cmm_timed_pages_target;
static long cmm_timeout_pages;
static long cmm_timeout_seconds;
+static int cmm_suspended;
static struct cmm_page_array *cmm_page_list;
static struct cmm_page_array *cmm_timed_page_list;
@@ -147,9 +149,9 @@ cmm_thread(void *dummy)
while (1) {
rc = wait_event_interruptible(cmm_thread_wait,
- (cmm_pages != cmm_pages_target ||
- cmm_timed_pages != cmm_timed_pages_target ||
- kthread_should_stop()));
+ (!cmm_suspended && (cmm_pages != cmm_pages_target ||
+ cmm_timed_pages != cmm_timed_pages_target)) ||
+ kthread_should_stop());
if (kthread_should_stop() || rc == -ERESTARTSYS) {
cmm_pages_target = cmm_pages;
cmm_timed_pages_target = cmm_timed_pages;
@@ -410,6 +412,38 @@ cmm_smsg_target(char *from, char *msg)
static struct ctl_table_header *cmm_sysctl_header;
+static int cmm_suspend(void)
+{
+ cmm_suspended = 1;
+ cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
+ cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
+ return 0;
+}
+
+static int cmm_resume(void)
+{
+ cmm_suspended = 0;
+ cmm_kick_thread();
+ return 0;
+}
+
+static int cmm_power_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ switch (event) {
+ case PM_POST_HIBERNATION:
+ return cmm_resume();
+ case PM_HIBERNATION_PREPARE:
+ return cmm_suspend();
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
+static struct notifier_block cmm_power_notifier = {
+ .notifier_call = cmm_power_event,
+};
+
static int
cmm_init (void)
{
@@ -418,7 +452,7 @@ cmm_init (void)
#ifdef CONFIG_CMM_PROC
cmm_sysctl_header = register_sysctl_table(cmm_dir_table);
if (!cmm_sysctl_header)
- goto out;
+ goto out_sysctl;
#endif
#ifdef CONFIG_CMM_IUCV
rc = smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
@@ -428,17 +462,21 @@ cmm_init (void)
rc = register_oom_notifier(&cmm_oom_nb);
if (rc < 0)
goto out_oom_notify;
+ rc = register_pm_notifier(&cmm_power_notifier);
+ if (rc)
+ goto out_pm;
init_waitqueue_head(&cmm_thread_wait);
init_timer(&cmm_timer);
cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread");
rc = IS_ERR(cmm_thread_ptr) ? PTR_ERR(cmm_thread_ptr) : 0;
- if (!rc)
- goto out;
- /*
- * kthread_create failed. undo all the stuff from above again.
- */
- unregister_oom_notifier(&cmm_oom_nb);
+ if (rc)
+ goto out_kthread;
+ return 0;
+out_kthread:
+ unregister_pm_notifier(&cmm_power_notifier);
+out_pm:
+ unregister_oom_notifier(&cmm_oom_nb);
out_oom_notify:
#ifdef CONFIG_CMM_IUCV
smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
@@ -446,8 +484,8 @@ out_smsg:
#endif
#ifdef CONFIG_CMM_PROC
unregister_sysctl_table(cmm_sysctl_header);
+out_sysctl:
#endif
-out:
return rc;
}
@@ -455,6 +493,7 @@ static void
cmm_exit(void)
{
kthread_stop(cmm_thread_ptr);
+ unregister_pm_notifier(&cmm_power_notifier);
unregister_oom_notifier(&cmm_oom_nb);
cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);