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Diffstat (limited to 'kernel/power/hibernate.c')
-rw-r--r--kernel/power/hibernate.c111
1 files changed, 70 insertions, 41 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index fca9254280ee..33c79b6105c5 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -52,6 +52,7 @@ enum {
#ifdef CONFIG_SUSPEND
HIBERNATION_SUSPEND,
#endif
+ HIBERNATION_TEST_RESUME,
/* keep last */
__HIBERNATION_AFTER_LAST
};
@@ -299,12 +300,12 @@ static int create_image(int platform_mode)
save_processor_state();
trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
error = swsusp_arch_suspend();
+ /* Restore control flow magically appears here */
+ restore_processor_state();
trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
if (error)
printk(KERN_ERR "PM: Error %d creating hibernation image\n",
error);
- /* Restore control flow magically appears here */
- restore_processor_state();
if (!in_suspend)
events_check_enabled = false;
@@ -409,6 +410,11 @@ int hibernation_snapshot(int platform_mode)
goto Close;
}
+int __weak hibernate_resume_nonboot_cpu_disable(void)
+{
+ return disable_nonboot_cpus();
+}
+
/**
* resume_target_kernel - Restore system state from a hibernation image.
* @platform_mode: Whether or not to use the platform driver.
@@ -433,7 +439,7 @@ static int resume_target_kernel(bool platform_mode)
if (error)
goto Cleanup;
- error = disable_nonboot_cpus();
+ error = hibernate_resume_nonboot_cpu_disable();
if (error)
goto Enable_cpus;
@@ -642,12 +648,39 @@ static void power_down(void)
cpu_relax();
}
+static int load_image_and_restore(void)
+{
+ int error;
+ unsigned int flags;
+
+ pr_debug("PM: Loading hibernation image.\n");
+
+ lock_device_hotplug();
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Unlock;
+
+ error = swsusp_read(&flags);
+ swsusp_close(FMODE_READ);
+ if (!error)
+ hibernation_restore(flags & SF_PLATFORM_MODE);
+
+ printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
+ swsusp_free();
+ free_basic_memory_bitmaps();
+ Unlock:
+ unlock_device_hotplug();
+
+ return error;
+}
+
/**
* hibernate - Carry out system hibernation, including saving the image.
*/
int hibernate(void)
{
- int error;
+ int error, nr_calls = 0;
+ bool snapshot_test = false;
if (!hibernation_available()) {
pr_debug("PM: Hibernation not available.\n");
@@ -662,9 +695,11 @@ int hibernate(void)
}
pm_prepare_console();
- error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
- if (error)
+ error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
+ if (error) {
+ nr_calls--;
goto Exit;
+ }
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
@@ -697,8 +732,12 @@ int hibernate(void)
pr_debug("PM: writing image.\n");
error = swsusp_write(flags);
swsusp_free();
- if (!error)
- power_down();
+ if (!error) {
+ if (hibernation_mode == HIBERNATION_TEST_RESUME)
+ snapshot_test = true;
+ else
+ power_down();
+ }
in_suspend = 0;
pm_restore_gfp_mask();
} else {
@@ -709,12 +748,18 @@ int hibernate(void)
free_basic_memory_bitmaps();
Thaw:
unlock_device_hotplug();
+ if (snapshot_test) {
+ pr_debug("PM: Checking hibernation image\n");
+ error = swsusp_check();
+ if (!error)
+ error = load_image_and_restore();
+ }
thaw_processes();
/* Don't bother checking whether freezer_test_done is true */
freezer_test_done = false;
Exit:
- pm_notifier_call_chain(PM_POST_HIBERNATION);
+ __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
pm_restore_console();
atomic_inc(&snapshot_device_available);
Unlock:
@@ -740,8 +785,7 @@ int hibernate(void)
*/
static int software_resume(void)
{
- int error;
- unsigned int flags;
+ int error, nr_calls = 0;
/*
* If the user said "noresume".. bail out early.
@@ -827,35 +871,20 @@ static int software_resume(void)
}
pm_prepare_console();
- error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
- if (error)
+ error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
+ if (error) {
+ nr_calls--;
goto Close_Finish;
+ }
pr_debug("PM: Preparing processes for restore.\n");
error = freeze_processes();
if (error)
goto Close_Finish;
-
- pr_debug("PM: Loading hibernation image.\n");
-
- lock_device_hotplug();
- error = create_basic_memory_bitmaps();
- if (error)
- goto Thaw;
-
- error = swsusp_read(&flags);
- swsusp_close(FMODE_READ);
- if (!error)
- hibernation_restore(flags & SF_PLATFORM_MODE);
-
- printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
- swsusp_free();
- free_basic_memory_bitmaps();
- Thaw:
- unlock_device_hotplug();
+ error = load_image_and_restore();
thaw_processes();
Finish:
- pm_notifier_call_chain(PM_POST_RESTORE);
+ __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
pm_restore_console();
atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
@@ -878,6 +907,7 @@ static const char * const hibernation_modes[] = {
#ifdef CONFIG_SUSPEND
[HIBERNATION_SUSPEND] = "suspend",
#endif
+ [HIBERNATION_TEST_RESUME] = "test_resume",
};
/*
@@ -924,6 +954,7 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
#ifdef CONFIG_SUSPEND
case HIBERNATION_SUSPEND:
#endif
+ case HIBERNATION_TEST_RESUME:
break;
case HIBERNATION_PLATFORM:
if (hibernation_ops)
@@ -970,6 +1001,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
#ifdef CONFIG_SUSPEND
case HIBERNATION_SUSPEND:
#endif
+ case HIBERNATION_TEST_RESUME:
hibernation_mode = mode;
break;
case HIBERNATION_PLATFORM:
@@ -1115,13 +1147,16 @@ static int __init resume_offset_setup(char *str)
static int __init hibernate_setup(char *str)
{
- if (!strncmp(str, "noresume", 8))
+ if (!strncmp(str, "noresume", 8)) {
noresume = 1;
- else if (!strncmp(str, "nocompress", 10))
+ } else if (!strncmp(str, "nocompress", 10)) {
nocompress = 1;
- else if (!strncmp(str, "no", 2)) {
+ } else if (!strncmp(str, "no", 2)) {
noresume = 1;
nohibernate = 1;
+ } else if (IS_ENABLED(CONFIG_DEBUG_RODATA)
+ && !strncmp(str, "protect_image", 13)) {
+ enable_restore_image_protection();
}
return 1;
}
@@ -1154,11 +1189,6 @@ static int __init nohibernate_setup(char *str)
return 1;
}
-static int __init kaslr_nohibernate_setup(char *str)
-{
- return nohibernate_setup(str);
-}
-
static int __init page_poison_nohibernate_setup(char *str)
{
#ifdef CONFIG_PAGE_POISONING_ZERO
@@ -1182,5 +1212,4 @@ __setup("hibernate=", hibernate_setup);
__setup("resumewait", resumewait_setup);
__setup("resumedelay=", resumedelay_setup);
__setup("nohibernate", nohibernate_setup);
-__setup("kaslr", kaslr_nohibernate_setup);
__setup("page_poison=", page_poison_nohibernate_setup);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-21 19:57:58 +0300