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Diffstat (limited to 'kernel/power/hibernate.c')
-rw-r--r--kernel/power/hibernate.c141
1 files changed, 79 insertions, 62 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 2444206e9..33c79b610 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -31,7 +31,7 @@
#include <linux/ktime.h>
#include <trace/events/power.h>
-#include "tuxonice.h"
+#include "power.h"
static int nocompress;
@@ -39,7 +39,7 @@ static int noresume;
static int nohibernate;
static int resume_wait;
static unsigned int resume_delay;
-char resume_file[256] = CONFIG_PM_STD_PARTITION;
+static char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
sector_t swsusp_resume_block;
__visible int in_suspend __nosavedata;
@@ -52,6 +52,7 @@ enum {
#ifdef CONFIG_SUSPEND
HIBERNATION_SUSPEND,
#endif
+ HIBERNATION_TEST_RESUME,
/* keep last */
__HIBERNATION_AFTER_LAST
};
@@ -123,7 +124,7 @@ static int hibernation_test(int level) { return 0; }
* platform_begin - Call platform to start hibernation.
* @platform_mode: Whether or not to use the platform driver.
*/
-int platform_begin(int platform_mode)
+static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
hibernation_ops->begin() : 0;
@@ -133,7 +134,7 @@ int platform_begin(int platform_mode)
* platform_end - Call platform to finish transition to the working state.
* @platform_mode: Whether or not to use the platform driver.
*/
-void platform_end(int platform_mode)
+static void platform_end(int platform_mode)
{
if (platform_mode && hibernation_ops)
hibernation_ops->end();
@@ -147,7 +148,7 @@ void platform_end(int platform_mode)
* if so configured, and return an error code if that fails.
*/
-int platform_pre_snapshot(int platform_mode)
+static int platform_pre_snapshot(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
hibernation_ops->pre_snapshot() : 0;
@@ -162,7 +163,7 @@ int platform_pre_snapshot(int platform_mode)
*
* This routine is called on one CPU with interrupts disabled.
*/
-void platform_leave(int platform_mode)
+static void platform_leave(int platform_mode)
{
if (platform_mode && hibernation_ops)
hibernation_ops->leave();
@@ -177,7 +178,7 @@ void platform_leave(int platform_mode)
*
* This routine must be called after platform_prepare().
*/
-void platform_finish(int platform_mode)
+static void platform_finish(int platform_mode)
{
if (platform_mode && hibernation_ops)
hibernation_ops->finish();
@@ -193,7 +194,7 @@ void platform_finish(int platform_mode)
* If the restore fails after this function has been called,
* platform_restore_cleanup() must be called.
*/
-int platform_pre_restore(int platform_mode)
+static int platform_pre_restore(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
hibernation_ops->pre_restore() : 0;
@@ -210,7 +211,7 @@ int platform_pre_restore(int platform_mode)
* function must be called too, regardless of the result of
* platform_pre_restore().
*/
-void platform_restore_cleanup(int platform_mode)
+static void platform_restore_cleanup(int platform_mode)
{
if (platform_mode && hibernation_ops)
hibernation_ops->restore_cleanup();
@@ -220,7 +221,7 @@ void platform_restore_cleanup(int platform_mode)
* platform_recover - Recover from a failure to suspend devices.
* @platform_mode: Whether or not to use the platform driver.
*/
-void platform_recover(int platform_mode)
+static void platform_recover(int platform_mode)
{
if (platform_mode && hibernation_ops && hibernation_ops->recover)
hibernation_ops->recover();
@@ -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;
@@ -642,15 +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;
-
- if (test_action_state(TOI_REPLACE_SWSUSP))
- return try_tuxonice_hibernate();
+ int error, nr_calls = 0;
+ bool snapshot_test = false;
if (!hibernation_available()) {
pr_debug("PM: Hibernation not available.\n");
@@ -665,9 +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();
@@ -700,8 +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 {
@@ -712,12 +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:
@@ -741,18 +783,9 @@ int hibernate(void)
* attempts to recover gracefully and make the kernel return to the normal mode
* of operation.
*/
-int software_resume(void)
+static int software_resume(void)
{
- int error;
- unsigned int flags;
-
- resume_attempted = 1;
-
- /*
- * We can't know (until an image header - if any - is loaded), whether
- * we did override swsusp. We therefore ensure that both are tried.
- */
- try_tuxonice_resume();
+ int error, nr_calls = 0;
/*
* If the user said "noresume".. bail out early.
@@ -838,35 +871,20 @@ 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 */
@@ -889,6 +907,7 @@ static const char * const hibernation_modes[] = {
#ifdef CONFIG_SUSPEND
[HIBERNATION_SUSPEND] = "suspend",
#endif
+ [HIBERNATION_TEST_RESUME] = "test_resume",
};
/*
@@ -935,6 +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)
@@ -981,6 +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:
@@ -1126,13 +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;
}
@@ -1140,7 +1164,6 @@ static int __init hibernate_setup(char *str)
static int __init noresume_setup(char *str)
{
noresume = 1;
- set_toi_state(TOI_NORESUME_SPECIFIED);
return 1;
}
@@ -1166,11 +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
@@ -1194,5 +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 2.25.1) at 2024-06-04 19:56:12 +0000