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Merge branch 'pm-sleep' 

* pm-sleep:
  PM / sleep: trace events for device PM callbacks
  PM / sleep: trace events for suspend/resume
This commit is contained in:
Rafael J. Wysocki 2014-06-12 13:43:08 +02:00
parent 589e18a973 e8bca479c3
commit d715a226b0
8 changed files with 124 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/acpi/sleep.c
View File

@ -19,6 +19,7 @@
#include <linux/acpi.h> #include <linux/acpi.h>
#include <linux/module.h> #include <linux/module.h>
#include <asm/io.h> #include <asm/io.h>
#include <trace/events/power.h>
#include "internal.h" #include "internal.h"
#include "sleep.h" #include "sleep.h"
@ -501,6 +502,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
ACPI_FLUSH_CPU_CACHE(); ACPI_FLUSH_CPU_CACHE();
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
switch (acpi_state) { switch (acpi_state) {
case ACPI_STATE_S1: case ACPI_STATE_S1:
barrier(); barrier();
@ -516,6 +518,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
pr_info(PREFIX "Low-level resume complete\n"); pr_info(PREFIX "Low-level resume complete\n");
break; break;
} }
trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
/* This violates the spec but is required for bug compatibility. */ /* This violates the spec but is required for bug compatibility. */
acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);

30
drivers/base/power/main.c
View File

@ -214,9 +214,6 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
error, (unsigned long long)nsecs >> 10); error, (unsigned long long)nsecs >> 10);
} }
trace_device_pm_report_time(dev, info, nsecs, pm_verb(state.event),
error);
} }
/** /**
@ -387,7 +384,9 @@ static int dpm_run_callback(pm_callback_t cb, struct device *dev,
calltime = initcall_debug_start(dev); calltime = initcall_debug_start(dev);
pm_dev_dbg(dev, state, info); pm_dev_dbg(dev, state, info);
trace_device_pm_callback_start(dev, info, state.event);
error = cb(dev); error = cb(dev);
trace_device_pm_callback_end(dev, error);
suspend_report_result(cb, error); suspend_report_result(cb, error);
initcall_debug_report(dev, calltime, error, state, info); initcall_debug_report(dev, calltime, error, state, info);
@ -545,6 +544,7 @@ static void dpm_resume_noirq(pm_message_t state)
struct device *dev; struct device *dev;
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true);
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
pm_transition = state; pm_transition = state;
@ -587,6 +587,7 @@ static void dpm_resume_noirq(pm_message_t state)
dpm_show_time(starttime, state, "noirq"); dpm_show_time(starttime, state, "noirq");
resume_device_irqs(); resume_device_irqs();
cpuidle_resume(); cpuidle_resume();
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
} }
/** /**
@ -664,6 +665,7 @@ static void dpm_resume_early(pm_message_t state)
struct device *dev; struct device *dev;
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
trace_suspend_resume(TPS("dpm_resume_early"), state.event, true);
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
pm_transition = state; pm_transition = state;
@ -703,6 +705,7 @@ static void dpm_resume_early(pm_message_t state)
mutex_unlock(&dpm_list_mtx); mutex_unlock(&dpm_list_mtx);
async_synchronize_full(); async_synchronize_full();
dpm_show_time(starttime, state, "early"); dpm_show_time(starttime, state, "early");
trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
} }
/** /**
@ -834,6 +837,7 @@ void dpm_resume(pm_message_t state)
struct device *dev; struct device *dev;
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
trace_suspend_resume(TPS("dpm_resume"), state.event, true);
might_sleep(); might_sleep();
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
@ -875,6 +879,7 @@ void dpm_resume(pm_message_t state)
dpm_show_time(starttime, state, NULL); dpm_show_time(starttime, state, NULL);
cpufreq_resume(); cpufreq_resume();
trace_suspend_resume(TPS("dpm_resume"), state.event, false);
} }
/** /**
@ -913,7 +918,9 @@ static void device_complete(struct device *dev, pm_message_t state)
if (callback) { if (callback) {
pm_dev_dbg(dev, state, info); pm_dev_dbg(dev, state, info);
trace_device_pm_callback_start(dev, info, state.event);
callback(dev); callback(dev);
trace_device_pm_callback_end(dev, 0);
} }
device_unlock(dev); device_unlock(dev);
@ -932,6 +939,7 @@ void dpm_complete(pm_message_t state)
{ {
struct list_head list; struct list_head list;
trace_suspend_resume(TPS("dpm_complete"), state.event, true);
might_sleep(); might_sleep();
INIT_LIST_HEAD(&list); INIT_LIST_HEAD(&list);
@ -951,6 +959,7 @@ void dpm_complete(pm_message_t state)
} }
list_splice(&list, &dpm_list); list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx); mutex_unlock(&dpm_list_mtx);
trace_suspend_resume(TPS("dpm_complete"), state.event, false);
} }
/** /**
@ -1086,6 +1095,7 @@ static int dpm_suspend_noirq(pm_message_t state)
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
int error = 0; int error = 0;
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
cpuidle_pause(); cpuidle_pause();
suspend_device_irqs(); suspend_device_irqs();
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
@ -1126,6 +1136,7 @@ static int dpm_suspend_noirq(pm_message_t state)
} else { } else {
dpm_show_time(starttime, state, "noirq"); dpm_show_time(starttime, state, "noirq");
} }
trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
return error; return error;
} }
@ -1222,6 +1233,7 @@ static int dpm_suspend_late(pm_message_t state)
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
int error = 0; int error = 0;
trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true);
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
pm_transition = state; pm_transition = state;
async_error = 0; async_error = 0;
@ -1257,6 +1269,7 @@ static int dpm_suspend_late(pm_message_t state)
} else { } else {
dpm_show_time(starttime, state, "late"); dpm_show_time(starttime, state, "late");
} }
trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
return error; return error;
} }
@ -1295,7 +1308,9 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
calltime = initcall_debug_start(dev); calltime = initcall_debug_start(dev);
trace_device_pm_callback_start(dev, info, state.event);
error = cb(dev, state); error = cb(dev, state);
trace_device_pm_callback_end(dev, error);
suspend_report_result(cb, error); suspend_report_result(cb, error);
initcall_debug_report(dev, calltime, error, state, info); initcall_debug_report(dev, calltime, error, state, info);
@ -1461,6 +1476,7 @@ int dpm_suspend(pm_message_t state)
ktime_t starttime = ktime_get(); ktime_t starttime = ktime_get();
int error = 0; int error = 0;
trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
might_sleep(); might_sleep();
cpufreq_suspend(); cpufreq_suspend();
@ -1498,6 +1514,7 @@ int dpm_suspend(pm_message_t state)
dpm_save_failed_step(SUSPEND_SUSPEND); dpm_save_failed_step(SUSPEND_SUSPEND);
} else } else
dpm_show_time(starttime, state, NULL); dpm_show_time(starttime, state, NULL);
trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
return error; return error;
} }
@ -1549,8 +1566,11 @@ static int device_prepare(struct device *dev, pm_message_t state)
callback = dev->driver->pm->prepare; callback = dev->driver->pm->prepare;
} }
if (callback) if (callback) {
trace_device_pm_callback_start(dev, info, state.event);
ret = callback(dev); ret = callback(dev);
trace_device_pm_callback_end(dev, ret);
}
device_unlock(dev); device_unlock(dev);
@ -1582,6 +1602,7 @@ int dpm_prepare(pm_message_t state)
{ {
int error = 0; int error = 0;
trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
might_sleep(); might_sleep();
mutex_lock(&dpm_list_mtx); mutex_lock(&dpm_list_mtx);
@ -1612,6 +1633,7 @@ int dpm_prepare(pm_message_t state)
put_device(dev); put_device(dev);
} }
mutex_unlock(&dpm_list_mtx); mutex_unlock(&dpm_list_mtx);
trace_suspend_resume(TPS("dpm_prepare"), state.event, false);
return error; return error;
} }

5
drivers/base/syscore.c
View File

@ -10,6 +10,7 @@
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <trace/events/power.h>
static LIST_HEAD(syscore_ops_list); static LIST_HEAD(syscore_ops_list);
static DEFINE_MUTEX(syscore_ops_lock); static DEFINE_MUTEX(syscore_ops_lock);
@ -49,6 +50,7 @@ int syscore_suspend(void)
struct syscore_ops *ops; struct syscore_ops *ops;
int ret = 0; int ret = 0;
trace_suspend_resume(TPS("syscore_suspend"), 0, true);
pr_debug("Checking wakeup interrupts\n"); pr_debug("Checking wakeup interrupts\n");
/* Return error code if there are any wakeup interrupts pending. */ /* Return error code if there are any wakeup interrupts pending. */
@ -70,6 +72,7 @@ int syscore_suspend(void)
"Interrupts enabled after %pF\n", ops->suspend); "Interrupts enabled after %pF\n", ops->suspend);
} }
trace_suspend_resume(TPS("syscore_suspend"), 0, false);
return 0; return 0;
err_out: err_out:
@ -92,6 +95,7 @@ void syscore_resume(void)
{ {
struct syscore_ops *ops; struct syscore_ops *ops;
trace_suspend_resume(TPS("syscore_resume"), 0, true);
WARN_ONCE(!irqs_disabled(), WARN_ONCE(!irqs_disabled(),
"Interrupts enabled before system core resume.\n"); "Interrupts enabled before system core resume.\n");
@ -103,6 +107,7 @@ void syscore_resume(void)
WARN_ONCE(!irqs_disabled(), WARN_ONCE(!irqs_disabled(),
"Interrupts enabled after %pF\n", ops->resume); "Interrupts enabled after %pF\n", ops->resume);
} }
trace_suspend_resume(TPS("syscore_resume"), 0, false);
} }
EXPORT_SYMBOL_GPL(syscore_resume); EXPORT_SYMBOL_GPL(syscore_resume);
#endif /* CONFIG_PM_SLEEP */ #endif /* CONFIG_PM_SLEEP */

102
include/trace/events/power.h
View File

@ -7,6 +7,9 @@
#include <linux/ktime.h> #include <linux/ktime.h>
#include <linux/pm_qos.h> #include <linux/pm_qos.h>
#include <linux/tracepoint.h> #include <linux/tracepoint.h>
#include <linux/ftrace_event.h>
#define TPS(x) tracepoint_string(x)
DECLARE_EVENT_CLASS(cpu, DECLARE_EVENT_CLASS(cpu,
@ -90,6 +93,17 @@ TRACE_EVENT(pstate_sample,
#define PWR_EVENT_EXIT -1 #define PWR_EVENT_EXIT -1
#endif #endif
#define pm_verb_symbolic(event) \
__print_symbolic(event, \
{ PM_EVENT_SUSPEND, "suspend" }, \
{ PM_EVENT_RESUME, "resume" }, \
{ PM_EVENT_FREEZE, "freeze" }, \
{ PM_EVENT_QUIESCE, "quiesce" }, \
{ PM_EVENT_HIBERNATE, "hibernate" }, \
{ PM_EVENT_THAW, "thaw" }, \
{ PM_EVENT_RESTORE, "restore" }, \
{ PM_EVENT_RECOVER, "recover" })
DEFINE_EVENT(cpu, cpu_frequency, DEFINE_EVENT(cpu, cpu_frequency,
TP_PROTO(unsigned int frequency, unsigned int cpu_id), TP_PROTO(unsigned int frequency, unsigned int cpu_id),
@ -97,58 +111,76 @@ DEFINE_EVENT(cpu, cpu_frequency,
TP_ARGS(frequency, cpu_id) TP_ARGS(frequency, cpu_id)
); );
TRACE_EVENT(machine_suspend, TRACE_EVENT(device_pm_callback_start,
TP_PROTO(unsigned int state), TP_PROTO(struct device *dev, const char *pm_ops, int event),
TP_ARGS(state), TP_ARGS(dev, pm_ops, event),
TP_STRUCT__entry(
__field( u32, state )
),
TP_fast_assign(
__entry->state = state;
),
TP_printk("state=%lu", (unsigned long)__entry->state)
);
TRACE_EVENT(device_pm_report_time,
TP_PROTO(struct device *dev, const char *pm_ops, s64 ops_time,
char *pm_event_str, int error),
TP_ARGS(dev, pm_ops, ops_time, pm_event_str, error),
TP_STRUCT__entry( TP_STRUCT__entry(
__string(device, dev_name(dev)) __string(device, dev_name(dev))
__string(driver, dev_driver_string(dev)) __string(driver, dev_driver_string(dev))
__string(parent, dev->parent ? dev_name(dev->parent) : "none") __string(parent, dev->parent ? dev_name(dev->parent) : "none")
__string(pm_ops, pm_ops ? pm_ops : "none ") __string(pm_ops, pm_ops ? pm_ops : "none ")
__string(pm_event_str, pm_event_str) __field(int, event)
__field(s64, ops_time) ),
TP_fast_assign(
__assign_str(device, dev_name(dev));
__assign_str(driver, dev_driver_string(dev));
__assign_str(parent,
dev->parent ? dev_name(dev->parent) : "none");
__assign_str(pm_ops, pm_ops ? pm_ops : "none ");
__entry->event = event;
),
TP_printk("%s %s, parent: %s, %s[%s]", __get_str(driver),
__get_str(device), __get_str(parent), __get_str(pm_ops),
pm_verb_symbolic(__entry->event))
);
TRACE_EVENT(device_pm_callback_end,
TP_PROTO(struct device *dev, int error),
TP_ARGS(dev, error),
TP_STRUCT__entry(
__string(device, dev_name(dev))
__string(driver, dev_driver_string(dev))
__field(int, error) __field(int, error)
), ),
TP_fast_assign( TP_fast_assign(
const char *tmp = dev->parent ? dev_name(dev->parent) : "none";
const char *tmp_i = pm_ops ? pm_ops : "none ";
__assign_str(device, dev_name(dev)); __assign_str(device, dev_name(dev));
__assign_str(driver, dev_driver_string(dev)); __assign_str(driver, dev_driver_string(dev));
__assign_str(parent, tmp);
__assign_str(pm_ops, tmp_i);
__assign_str(pm_event_str, pm_event_str);
__entry->ops_time = ops_time;
__entry->error = error; __entry->error = error;
), ),
/* ops_str has an extra space at the end */ TP_printk("%s %s, err=%d",
TP_printk("%s %s parent=%s state=%s ops=%snsecs=%lld err=%d", __get_str(driver), __get_str(device), __entry->error)
__get_str(driver), __get_str(device), __get_str(parent), );
__get_str(pm_event_str), __get_str(pm_ops),
__entry->ops_time, __entry->error) TRACE_EVENT(suspend_resume,
TP_PROTO(const char *action, int val, bool start),
TP_ARGS(action, val, start),
TP_STRUCT__entry(
__field(const char *, action)
__field(int, val)
__field(bool, start)
),
TP_fast_assign(
__entry->action = action;
__entry->val = val;
__entry->start = start;
),
TP_printk("%s[%u] %s", __entry->action, (unsigned int)__entry->val,
(__entry->start)?"begin":"end")
); );
DECLARE_EVENT_CLASS(wakeup_source, DECLARE_EVENT_CLASS(wakeup_source,

5
kernel/cpu.c
View File

@ -20,6 +20,7 @@
#include <linux/gfp.h> #include <linux/gfp.h>
#include <linux/suspend.h> #include <linux/suspend.h>
#include <linux/lockdep.h> #include <linux/lockdep.h>
#include <trace/events/power.h>
#include "smpboot.h" #include "smpboot.h"
@ -522,7 +523,9 @@ int disable_nonboot_cpus(void)
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
if (cpu == first_cpu) if (cpu == first_cpu)
continue; continue;
trace_suspend_resume(TPS("CPU_OFF"), cpu, true);
error = _cpu_down(cpu, 1); error = _cpu_down(cpu, 1);
trace_suspend_resume(TPS("CPU_OFF"), cpu, false);
if (!error) if (!error)
cpumask_set_cpu(cpu, frozen_cpus); cpumask_set_cpu(cpu, frozen_cpus);
else { else {
@ -566,7 +569,9 @@ void __ref enable_nonboot_cpus(void)
arch_enable_nonboot_cpus_begin(); arch_enable_nonboot_cpus_begin();
for_each_cpu(cpu, frozen_cpus) { for_each_cpu(cpu, frozen_cpus) {
trace_suspend_resume(TPS("CPU_ON"), cpu, true);
error = _cpu_up(cpu, 1); error = _cpu_up(cpu, 1);
trace_suspend_resume(TPS("CPU_ON"), cpu, false);
if (!error) { if (!error) {
printk(KERN_INFO "CPU%d is up\n", cpu); printk(KERN_INFO "CPU%d is up\n", cpu);
continue; continue;

3
kernel/power/hibernate.c
View File

@ -28,6 +28,7 @@
#include <linux/syscore_ops.h> #include <linux/syscore_ops.h>
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/genhd.h> #include <linux/genhd.h>
#include <trace/events/power.h>
#include "power.h" #include "power.h"
@ -292,7 +293,9 @@ static int create_image(int platform_mode)
in_suspend = 1; in_suspend = 1;
save_processor_state(); save_processor_state();
trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
error = swsusp_arch_suspend(); error = swsusp_arch_suspend();
trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
if (error) if (error)
printk(KERN_ERR "PM: Error %d creating hibernation image\n", printk(KERN_ERR "PM: Error %d creating hibernation image\n",
error); error);

3
kernel/power/process.c
View File

@ -17,6 +17,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/workqueue.h> #include <linux/workqueue.h>
#include <linux/kmod.h> #include <linux/kmod.h>
#include <trace/events/power.h>
/* /*
* Timeout for stopping processes * Timeout for stopping processes
@ -175,6 +176,7 @@ void thaw_processes(void)
struct task_struct *g, *p; struct task_struct *g, *p;
struct task_struct *curr = current; struct task_struct *curr = current;
trace_suspend_resume(TPS("thaw_processes"), 0, true);
if (pm_freezing) if (pm_freezing)
atomic_dec(&system_freezing_cnt); atomic_dec(&system_freezing_cnt);
pm_freezing = false; pm_freezing = false;
@ -201,6 +203,7 @@ void thaw_processes(void)
schedule(); schedule();
printk("done.\n"); printk("done.\n");
trace_suspend_resume(TPS("thaw_processes"), 0, false);
} }
void thaw_kernel_threads(void) void thaw_kernel_threads(void)

14
kernel/power/suspend.c
View File

@ -177,7 +177,9 @@ static int suspend_prepare(suspend_state_t state)
if (error) if (error)
goto Finish; goto Finish;
trace_suspend_resume(TPS("freeze_processes"), 0, true);
error = suspend_freeze_processes(); error = suspend_freeze_processes();
trace_suspend_resume(TPS("freeze_processes"), 0, false);
if (!error) if (!error)
return 0; return 0;
@ -240,7 +242,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
* all the devices are suspended. * all the devices are suspended.
*/ */
if (state == PM_SUSPEND_FREEZE) { if (state == PM_SUSPEND_FREEZE) {
trace_suspend_resume(TPS("machine_suspend"), state, true);
freeze_enter(); freeze_enter();
trace_suspend_resume(TPS("machine_suspend"), state, false);
goto Platform_wake; goto Platform_wake;
} }
@ -256,7 +260,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
if (!error) { if (!error) {
*wakeup = pm_wakeup_pending(); *wakeup = pm_wakeup_pending();
if (!(suspend_test(TEST_CORE) || *wakeup)) { if (!(suspend_test(TEST_CORE) || *wakeup)) {
trace_suspend_resume(TPS("machine_suspend"),
state, true);
error = suspend_ops->enter(state); error = suspend_ops->enter(state);
trace_suspend_resume(TPS("machine_suspend"),
state, false);
events_check_enabled = false; events_check_enabled = false;
} }
syscore_resume(); syscore_resume();
@ -294,7 +302,6 @@ int suspend_devices_and_enter(suspend_state_t state)
if (need_suspend_ops(state) && !suspend_ops) if (need_suspend_ops(state) && !suspend_ops)
return -ENOSYS; return -ENOSYS;
trace_machine_suspend(state);
if (need_suspend_ops(state) && suspend_ops->begin) { if (need_suspend_ops(state) && suspend_ops->begin) {
error = suspend_ops->begin(state); error = suspend_ops->begin(state);
if (error) if (error)
@ -331,7 +338,6 @@ int suspend_devices_and_enter(suspend_state_t state)
else if (state == PM_SUSPEND_FREEZE && freeze_ops->end) else if (state == PM_SUSPEND_FREEZE && freeze_ops->end)
freeze_ops->end(); freeze_ops->end();
trace_machine_suspend(PWR_EVENT_EXIT);
return error; return error;
Recover_platform: Recover_platform:
@ -365,6 +371,7 @@ static int enter_state(suspend_state_t state)
{ {
int error; int error;
trace_suspend_resume(TPS("suspend_enter"), state, true);
if (state == PM_SUSPEND_FREEZE) { if (state == PM_SUSPEND_FREEZE) {
#ifdef CONFIG_PM_DEBUG #ifdef CONFIG_PM_DEBUG
if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
@ -382,9 +389,11 @@ static int enter_state(suspend_state_t state)
if (state == PM_SUSPEND_FREEZE) if (state == PM_SUSPEND_FREEZE)
freeze_begin(); freeze_begin();
trace_suspend_resume(TPS("sync_filesystems"), 0, true);
printk(KERN_INFO "PM: Syncing filesystems ... "); printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync(); sys_sync();
printk("done.\n"); printk("done.\n");
trace_suspend_resume(TPS("sync_filesystems"), 0, false);
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label); pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
error = suspend_prepare(state); error = suspend_prepare(state);
@ -394,6 +403,7 @@ static int enter_state(suspend_state_t state)
if (suspend_test(TEST_FREEZER)) if (suspend_test(TEST_FREEZER))
goto Finish; goto Finish;
trace_suspend_resume(TPS("suspend_enter"), state, false);
pr_debug("PM: Entering %s sleep\n", pm_states[state].label); pr_debug("PM: Entering %s sleep\n", pm_states[state].label);
pm_restrict_gfp_mask(); pm_restrict_gfp_mask();
error = suspend_devices_and_enter(state); error = suspend_devices_and_enter(state);