#include <linux/syscore_ops.h>
#include <linux/ctype.h>
#include <linux/genhd.h>
+#include <linux/ktime.h>
+#include <trace/events/power.h>
#include "power.h"
static int nocompress;
static int noresume;
+static int nohibernate;
static int resume_wait;
-static int resume_delay;
+static unsigned int resume_delay;
static char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
sector_t swsusp_resume_block;
-int in_suspend __nosavedata;
+__visible int in_suspend __nosavedata;
enum {
HIBERNATION_INVALID,
static const struct platform_hibernation_ops *hibernation_ops;
+bool hibernation_available(void)
+{
+ return (nohibernate == 0);
+}
+
/**
* hibernation_set_ops - Set the global hibernate operations.
* @ops: Hibernation operations to use in subsequent hibernation transitions.
unlock_system_sleep();
}
+EXPORT_SYMBOL_GPL(hibernation_set_ops);
static bool entering_platform_hibernation;
* @nr_pages: Number of memory pages processed between @start and @stop.
* @msg: Additional diagnostic message to print.
*/
-void swsusp_show_speed(struct timeval *start, struct timeval *stop,
- unsigned nr_pages, char *msg)
+void swsusp_show_speed(ktime_t start, ktime_t stop,
+ unsigned nr_pages, char *msg)
{
- s64 elapsed_centisecs64;
- int centisecs;
- int k;
- int kps;
-
- elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
- do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
+ ktime_t diff;
+ u64 elapsed_centisecs64;
+ unsigned int centisecs;
+ unsigned int k;
+ unsigned int kps;
+
+ diff = ktime_sub(stop, start);
+ elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
centisecs = elapsed_centisecs64;
if (centisecs == 0)
centisecs = 1; /* avoid div-by-zero */
k = nr_pages * (PAGE_SIZE / 1024);
kps = (k * 100) / centisecs;
- printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
+ printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
msg, k,
centisecs / 100, centisecs % 100,
kps / 1000, (kps % 1000) / 10);
in_suspend = 1;
save_processor_state();
+ trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
error = swsusp_arch_suspend();
+ 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) {
+ if (!in_suspend)
events_check_enabled = false;
- platform_leave(platform_mode);
- }
+
+ platform_leave(platform_mode);
Power_up:
syscore_resume();
pm_message_t msg;
int error;
+ pm_suspend_clear_flags();
error = platform_begin(platform_mode);
if (error)
goto Close;
}
suspend_console();
- ftrace_stop();
pm_restrict_gfp_mask();
error = dpm_suspend(PMSG_FREEZE);
if (error || !in_suspend)
pm_restore_gfp_mask();
- ftrace_start();
resume_console();
dpm_complete(msg);
pm_prepare_console();
suspend_console();
- ftrace_stop();
pm_restrict_gfp_mask();
error = dpm_suspend_start(PMSG_QUIESCE);
if (!error) {
error = resume_target_kernel(platform_mode);
- dpm_resume_end(PMSG_RECOVER);
+ /*
+ * The above should either succeed and jump to the new kernel,
+ * or return with an error. Otherwise things are just
+ * undefined, so let's be paranoid.
+ */
+ BUG_ON(!error);
}
+ dpm_resume_end(PMSG_RECOVER);
pm_restore_gfp_mask();
- ftrace_start();
resume_console();
pm_restore_console();
return error;
entering_platform_hibernation = true;
suspend_console();
- ftrace_stop();
error = dpm_suspend_start(PMSG_HIBERNATE);
if (error) {
if (hibernation_ops->recover)
error = disable_nonboot_cpus();
if (error)
- goto Platform_finish;
+ goto Enable_cpus;
local_irq_disable();
syscore_suspend();
Power_up:
syscore_resume();
local_irq_enable();
+
+ Enable_cpus:
enable_nonboot_cpus();
Platform_finish:
Resume_devices:
entering_platform_hibernation = false;
dpm_resume_end(PMSG_RESTORE);
- ftrace_start();
resume_console();
Close:
case HIBERNATION_PLATFORM:
hibernation_platform_enter();
case HIBERNATION_SHUTDOWN:
- kernel_power_off();
+ if (pm_power_off)
+ kernel_power_off();
break;
#ifdef CONFIG_SUSPEND
case HIBERNATION_SUSPEND:
* corruption after resume.
*/
printk(KERN_CRIT "PM: Please power down manually\n");
- while(1);
+ while (1)
+ cpu_relax();
}
/**
{
int error;
+ if (!hibernation_available()) {
+ pr_debug("PM: Hibernation not available.\n");
+ return -EPERM;
+ }
+
lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
if (error)
goto Exit;
- /* Allocate memory management structures */
- error = create_basic_memory_bitmaps();
- if (error)
- goto Exit;
-
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
error = freeze_processes();
if (error)
- goto Free_bitmaps;
+ goto Exit;
+
+ lock_device_hotplug();
+ /* Allocate memory management structures */
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Thaw;
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (error || freezer_test_done)
- goto Thaw;
+ goto Free_bitmaps;
if (in_suspend) {
unsigned int flags = 0;
pr_debug("PM: Image restored successfully.\n");
}
+ Free_bitmaps:
+ free_basic_memory_bitmaps();
Thaw:
+ unlock_device_hotplug();
thaw_processes();
/* Don't bother checking whether freezer_test_done is true */
freezer_test_done = false;
-
- Free_bitmaps:
- free_basic_memory_bitmaps();
Exit:
pm_notifier_call_chain(PM_POST_HIBERNATION);
pm_restore_console();
* contents of memory is restored from the saved image.
*
* If this is successful, control reappears in the restored target kernel in
- * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
+ * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
* attempts to recover gracefully and make the kernel return to the normal mode
* of operation.
*/
/*
* If the user said "noresume".. bail out early.
*/
- if (noresume)
+ if (noresume || !hibernation_available())
return 0;
/*
pm_prepare_console();
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
if (error)
- goto close_finish;
-
- error = create_basic_memory_bitmaps();
- if (error)
- goto close_finish;
+ goto Close_Finish;
pr_debug("PM: Preparing processes for restore.\n");
error = freeze_processes();
- if (error) {
- swsusp_close(FMODE_READ);
- goto Done;
- }
+ 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)
printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
swsusp_free();
- thaw_processes();
- Done:
free_basic_memory_bitmaps();
+ Thaw:
+ unlock_device_hotplug();
+ thaw_processes();
Finish:
pm_notifier_call_chain(PM_POST_RESTORE);
pm_restore_console();
mutex_unlock(&pm_mutex);
pr_debug("PM: Hibernation image not present or could not be loaded.\n");
return error;
-close_finish:
+ Close_Finish:
swsusp_close(FMODE_READ);
goto Finish;
}
-late_initcall(software_resume);
+late_initcall_sync(software_resume);
static const char * const hibernation_modes[] = {
int i;
char *start = buf;
+ if (!hibernation_available())
+ return sprintf(buf, "[disabled]\n");
+
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
if (!hibernation_modes[i])
continue;
char *p;
int mode = HIBERNATION_INVALID;
+ if (!hibernation_available())
+ return -EPERM;
+
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
- unsigned int maj, min;
dev_t res;
- int ret = -EINVAL;
+ int len = n;
+ char *name;
- if (sscanf(buf, "%u:%u", &maj, &min) != 2)
- goto out;
+ if (len && buf[len-1] == '\n')
+ len--;
+ name = kstrndup(buf, len, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
- res = MKDEV(maj,min);
- if (maj != MAJOR(res) || min != MINOR(res))
- goto out;
+ res = name_to_dev_t(name);
+ kfree(name);
+ if (!res)
+ return -EINVAL;
lock_system_sleep();
swsusp_resume_device = res;
printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
- ret = n;
- out:
- return ret;
+ return n;
}
power_attr(resume);
noresume = 1;
else if (!strncmp(str, "nocompress", 10))
nocompress = 1;
+ else if (!strncmp(str, "no", 2)) {
+ noresume = 1;
+ nohibernate = 1;
+ }
return 1;
}
static int __init resumedelay_setup(char *str)
{
- resume_delay = simple_strtoul(str, NULL, 0);
+ int rc = kstrtouint(str, 0, &resume_delay);
+
+ if (rc)
+ return rc;
return 1;
}
+static int __init nohibernate_setup(char *str)
+{
+ noresume = 1;
+ nohibernate = 1;
+ return 1;
+}
+
+static int __init kaslr_nohibernate_setup(char *str)
+{
+ return nohibernate_setup(str);
+}
+
__setup("noresume", noresume_setup);
__setup("resume_offset=", resume_offset_setup);
__setup("resume=", resume_setup);
__setup("hibernate=", hibernate_setup);
__setup("resumewait", resumewait_setup);
__setup("resumedelay=", resumedelay_setup);
+__setup("nohibernate", nohibernate_setup);
+__setup("kaslr", kaslr_nohibernate_setup);
projects / firefly-linux-kernel-4.4.55.git / blobdiff