android/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: power: wakeup_reason: add an API to log wakeup reasons

Browse Source 
Add API log_wakeup_reason() and expose it to userspace via sysfs path
/sys/kernel/wakeup_reasons/last_resume_reason

Bug: 120445600
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
[AmitP: Folded following android-4.9 commit changes into this patch
        1135122a192a ("ANDROID: POWER: fix compile warnings in log_wakeup_reason")
        b4e6247778b0 ("ANDROID: Power: Changes the permission to read only for sysfs file /sys/kernel/wakeup_reasons/last_resume_reason")
        e13dbc7c69cd ("ANDROID: power: wakeup_reason: rename irq_count to irqcount")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
[astrachan: Folded the following changes into this patch:
            39d7c7fe91c0 ("ANDROID: power: wakeup_reason: Add guard condition for maximum wakeup reasons")
            0730434bdf49 ("ANDROID: power: wakeup_reason: Avoids bogus error messages for the suspend aborts.")
            4e42dceae54e ("ANDROID: power: wakeup_reason: Adds functionality to log the last suspend abort reason.")
            f21313b70ac7 ("ANDROID: power: wakeup_reason: Report suspend times from last_suspend_time")
            f97ec34442ac ("ANDROID: power: wakeup_reason: fix suspend time reporting")
            cd92df73e504 ("ANDROID: power: wakeup: Add last wake up source logging for suspend abort reason.")
            546b6ae3c087 ("ANDROID: power: wakeup: Add the guard condition for len in pm_get_active_wakeup_sources")
            1453d9ffcdbe ("ANDROID: power: wakeup_reason: make logging work in an interrupt context.")]
Change-Id: I81addaf420f1338255c5d0638b0d244a99d777d1
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Ruchi Kandoi 2014-02-19 15:30:47 -08:00 committed by Todd Kjos
parent 92501cb670
commit bc17c02a85
10 changed files with 343 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Documentation/ABI/testing/sysfs-kernel-wakeup_reasons Normal file
View File

@ -0,0 +1,16 @@
What: /sys/kernel/wakeup_reasons/last_resume_reason
Date: February 2014
Contact: Ruchi Kandoi <kandoiruchi@google.com>
Description:
The /sys/kernel/wakeup_reasons/last_resume_reason is
used to report wakeup reasons after system exited suspend.
What: /sys/kernel/wakeup_reasons/last_suspend_time
Date: March 2015
Contact: jinqian <jinqian@google.com>
Description:
The /sys/kernel/wakeup_reasons/last_suspend_time is
used to report time spent in last suspend cycle. It contains
two numbers (in seconds) separated by space. First number is
the time spent in suspend and resume processes. Second number
is the time spent in sleep state.

5
drivers/base/power/main.c
View File

@ -33,6 +33,7 @@
#include <linux/cpufreq.h>
#include <linux/cpuidle.h>
#include <linux/timer.h>
#include <linux/wakeup_reason.h>
#include "../base.h"
#include "power.h"
@ -1706,6 +1707,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
pm_callback_t callback = NULL;
const char *info = NULL;
int error = 0;
char suspend_abort[MAX_SUSPEND_ABORT_LEN];
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
TRACE_DEVICE(dev);
@ -1729,6 +1731,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (pm_wakeup_pending()) {
dev->power.direct_complete = false;
pm_get_active_wakeup_sources(suspend_abort,
MAX_SUSPEND_ABORT_LEN);
log_suspend_abort_reason(suspend_abort);
async_error = -EBUSY;
goto Complete;
}

32
drivers/base/power/wakeup.c
View File

@ -15,6 +15,7 @@
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/pm_wakeirq.h>
#include <linux/types.h>
#include <trace/events/power.h>
#include "power.h"
@ -803,6 +804,37 @@ void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
}
EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max)
{
struct wakeup_source *ws, *last_active_ws = NULL;
int len = 0;
bool active = false;
rcu_read_lock();
list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
if (ws->active && len < max) {
if (!active)
len += scnprintf(pending_wakeup_source, max,
"Pending Wakeup Sources: ");
len += scnprintf(pending_wakeup_source + len, max - len,
"%s ", ws->name);
active = true;
} else if (!active &&
(!last_active_ws ||
ktime_to_ns(ws->last_time) >
ktime_to_ns(last_active_ws->last_time))) {
last_active_ws = ws;
}
}
if (!active && last_active_ws) {
scnprintf(pending_wakeup_source, max,
"Last active Wakeup Source: %s",
last_active_ws->name);
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(pm_get_active_wakeup_sources);
void pm_print_active_wakeup_sources(void)
{
struct wakeup_source *ws;

3
drivers/base/syscore.c
View File

@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/suspend.h>
#include <trace/events/power.h>
#include <linux/wakeup_reason.h>
static LIST_HEAD(syscore_ops_list);
static DEFINE_MUTEX(syscore_ops_lock);
@ -74,6 +75,8 @@ int syscore_suspend(void)
return 0;
err_out:
log_suspend_abort_reason("System core suspend callback %pF failed",
ops->suspend);
pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
list_for_each_entry_continue(ops, &syscore_ops_list, node)

1
include/linux/suspend.h
View File

@ -446,6 +446,7 @@ extern bool pm_get_wakeup_count(unsigned int *count, bool block);
extern bool pm_save_wakeup_count(unsigned int count);
extern void pm_wakep_autosleep_enabled(bool set);
extern void pm_print_active_wakeup_sources(void);
extern void pm_get_active_wakeup_sources(char *pending_sources, size_t max);
extern void lock_system_sleep(void);
extern void unlock_system_sleep(void);

30
include/linux/wakeup_reason.h Normal file
View File

@ -0,0 +1,30 @@
/*
* include/linux/wakeup_reason.h
*
* Logs the reason which caused the kernel to resume
* from the suspend mode.
*
* Copyright (C) 2014 Google, Inc.
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _LINUX_WAKEUP_REASON_H
#define _LINUX_WAKEUP_REASON_H
#define MAX_SUSPEND_ABORT_LEN 256
void log_wakeup_reason(int irq);
#ifdef CONFIG_SUSPEND
void log_suspend_abort_reason(const char *fmt, ...);
#else
static inline void log_suspend_abort_reason(const char *fmt, ...) { }
#endif
#endif /* _LINUX_WAKEUP_REASON_H */

2
kernel/power/Makefile
View File

@ -15,3 +15,5 @@ obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
obj-$(CONFIG_SUSPEND) += wakeup_reason.o

34
kernel/power/process.c
View File

@ -22,6 +22,7 @@
#include <linux/kmod.h>
#include <trace/events/power.h>
#include <linux/cpuset.h>
#include <linux/wakeup_reason.h>
/*
* Timeout for stopping processes
@ -38,6 +39,9 @@ static int try_to_freeze_tasks(bool user_only)
unsigned int elapsed_msecs;
bool wakeup = false;
int sleep_usecs = USEC_PER_MSEC;
#ifdef CONFIG_PM_SLEEP
char suspend_abort[MAX_SUSPEND_ABORT_LEN];
#endif
start = ktime_get_boottime();
@ -67,6 +71,11 @@ static int try_to_freeze_tasks(bool user_only)
break;
if (pm_wakeup_pending()) {
#ifdef CONFIG_PM_SLEEP
pm_get_active_wakeup_sources(suspend_abort,
MAX_SUSPEND_ABORT_LEN);
log_suspend_abort_reason(suspend_abort);
#endif
wakeup = true;
break;
}
@ -85,26 +94,27 @@ static int try_to_freeze_tasks(bool user_only)
elapsed = ktime_sub(end, start);
elapsed_msecs = ktime_to_ms(elapsed);
if (todo) {
if (wakeup) {
pr_cont("\n");
pr_err("Freezing of tasks %s after %d.%03d seconds "
"(%d tasks refusing to freeze, wq_busy=%d):\n",
wakeup ? "aborted" : "failed",
pr_err("Freezing of tasks aborted after %d.%03d seconds",
elapsed_msecs / 1000, elapsed_msecs % 1000);
} else if (todo) {
pr_cont("\n");
pr_err("Freezing of tasks failed after %d.%03d seconds"
" (%d tasks refusing to freeze, wq_busy=%d):\n",
elapsed_msecs / 1000, elapsed_msecs % 1000,
todo - wq_busy, wq_busy);
if (wq_busy)
show_workqueue_state();
if (!wakeup) {
read_lock(&tasklist_lock);
for_each_process_thread(g, p) {
if (p != current && !freezer_should_skip(p)
&& freezing(p) && !frozen(p))
sched_show_task(p);
}
read_unlock(&tasklist_lock);
read_lock(&tasklist_lock);
for_each_process_thread(g, p) {
if (p != current && !freezer_should_skip(p)
&& freezing(p) && !frozen(p))
sched_show_task(p);
}
read_unlock(&tasklist_lock);
} else {
pr_cont("(elapsed %d.%03d seconds) ", elapsed_msecs / 1000,
elapsed_msecs % 1000);

20
kernel/power/suspend.c
View File

@ -32,6 +32,7 @@
#include <trace/events/power.h>
#include <linux/compiler.h>
#include <linux/moduleparam.h>
#include <linux/wakeup_reason.h>
#include "power.h"
@ -396,7 +397,8 @@ void __weak arch_suspend_enable_irqs(void)
*/
static int suspend_enter(suspend_state_t state, bool *wakeup)
{
int error;
char suspend_abort[MAX_SUSPEND_ABORT_LEN];
int error, last_dev;
error = platform_suspend_prepare(state);
if (error)
@ -404,7 +406,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
error = dpm_suspend_late(PMSG_SUSPEND);
if (error) {
last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
last_dev %= REC_FAILED_NUM;
pr_err("late suspend of devices failed\n");
log_suspend_abort_reason("%s device failed to power down",
suspend_stats.failed_devs[last_dev]);
goto Platform_finish;
}
error = platform_suspend_prepare_late(state);
@ -418,7 +424,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
error = dpm_suspend_noirq(PMSG_SUSPEND);
if (error) {
last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
last_dev %= REC_FAILED_NUM;
pr_err("noirq suspend of devices failed\n");
log_suspend_abort_reason("noirq suspend of %s device failed",
suspend_stats.failed_devs[last_dev]);
goto Platform_early_resume;
}
error = platform_suspend_prepare_noirq(state);
@ -429,8 +439,10 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
goto Platform_wake;
error = disable_nonboot_cpus();
if (error || suspend_test(TEST_CPUS))
if (error || suspend_test(TEST_CPUS)) {
log_suspend_abort_reason("Disabling non-boot cpus failed");
goto Enable_cpus;
}
arch_suspend_disable_irqs();
BUG_ON(!irqs_disabled());
@ -447,6 +459,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
trace_suspend_resume(TPS("machine_suspend"),
state, false);
} else if (*wakeup) {
pm_get_active_wakeup_sources(suspend_abort,
MAX_SUSPEND_ABORT_LEN);
log_suspend_abort_reason(suspend_abort);
error = -EBUSY;
}
syscore_resume();
@ -498,6 +513,7 @@ int suspend_devices_and_enter(suspend_state_t state)
error = dpm_suspend_start(PMSG_SUSPEND);
if (error) {
pr_err("Some devices failed to suspend, or early wake event detected\n");
log_suspend_abort_reason("Some devices failed to suspend, or early wake event detected");
goto Recover_platform;
}
suspend_test_finish("suspend devices");

214
kernel/power/wakeup_reason.c Normal file
View File

@ -0,0 +1,214 @@
/*
* kernel/power/wakeup_reason.c
*
* Logs the reasons which caused the kernel to resume from
* the suspend mode.
*
* Copyright (C) 2014 Google, Inc.
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/wakeup_reason.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
#include <linux/suspend.h>
#define MAX_WAKEUP_REASON_IRQS 32
static int irq_list[MAX_WAKEUP_REASON_IRQS];
static int irqcount;
static bool suspend_abort;
static char abort_reason[MAX_SUSPEND_ABORT_LEN];
static struct kobject *wakeup_reason;
static spinlock_t resume_reason_lock;
static ktime_t last_monotime; /* monotonic time before last suspend */
static ktime_t curr_monotime; /* monotonic time after last suspend */
static ktime_t last_stime; /* monotonic boottime offset before last suspend */
static ktime_t curr_stime; /* monotonic boottime offset after last suspend */
static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
int irq_no, buf_offset = 0;
struct irq_desc *desc;
unsigned long flags;
spin_lock_irqsave(&resume_reason_lock, flags);
if (suspend_abort) {
buf_offset = sprintf(buf, "Abort: %s", abort_reason);
} else {
for (irq_no = 0; irq_no < irqcount; irq_no++) {
desc = irq_to_desc(irq_list[irq_no]);
if (desc && desc->action && desc->action->name)
buf_offset += sprintf(buf + buf_offset, "%d %s\n",
irq_list[irq_no], desc->action->name);
else
buf_offset += sprintf(buf + buf_offset, "%d\n",
irq_list[irq_no]);
}
}
spin_unlock_irqrestore(&resume_reason_lock, flags);
return buf_offset;
}
static ssize_t last_suspend_time_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct timespec sleep_time;
struct timespec total_time;
struct timespec suspend_resume_time;
/*
* total_time is calculated from monotonic bootoffsets because
* unlike CLOCK_MONOTONIC it include the time spent in suspend state.
*/
total_time = ktime_to_timespec(ktime_sub(curr_stime, last_stime));
/*
* suspend_resume_time is calculated as monotonic (CLOCK_MONOTONIC)
* time interval before entering suspend and post suspend.
*/
suspend_resume_time = ktime_to_timespec(ktime_sub(curr_monotime, last_monotime));
/* sleep_time = total_time - suspend_resume_time */
sleep_time = timespec_sub(total_time, suspend_resume_time);
/* Export suspend_resume_time and sleep_time in pair here. */
return sprintf(buf, "%lu.%09lu %lu.%09lu\n",
suspend_resume_time.tv_sec, suspend_resume_time.tv_nsec,
sleep_time.tv_sec, sleep_time.tv_nsec);
}
static struct kobj_attribute resume_reason = __ATTR_RO(last_resume_reason);
static struct kobj_attribute suspend_time = __ATTR_RO(last_suspend_time);
static struct attribute *attrs[] = {
&resume_reason.attr,
&suspend_time.attr,
NULL,
};
static struct attribute_group attr_group = {
.attrs = attrs,
};
/*
* logs all the wake up reasons to the kernel
* stores the irqs to expose them to the userspace via sysfs
*/
void log_wakeup_reason(int irq)
{
struct irq_desc *desc;
unsigned long flags;
desc = irq_to_desc(irq);
if (desc && desc->action && desc->action->name)
printk(KERN_INFO "Resume caused by IRQ %d, %s\n", irq,
desc->action->name);
else
printk(KERN_INFO "Resume caused by IRQ %d\n", irq);
spin_lock_irqsave(&resume_reason_lock, flags);
if (irqcount == MAX_WAKEUP_REASON_IRQS) {
spin_unlock_irqrestore(&resume_reason_lock, flags);
printk(KERN_WARNING "Resume caused by more than %d IRQs\n",
MAX_WAKEUP_REASON_IRQS);
return;
}
irq_list[irqcount++] = irq;
spin_unlock_irqrestore(&resume_reason_lock, flags);
}
void log_suspend_abort_reason(const char *fmt, ...)
{
unsigned long flags;
va_list args;
spin_lock_irqsave(&resume_reason_lock, flags);
//Suspend abort reason has already been logged.
if (suspend_abort) {
spin_unlock_irqrestore(&resume_reason_lock, flags);
return;
}
suspend_abort = true;
va_start(args, fmt);
vsnprintf(abort_reason, MAX_SUSPEND_ABORT_LEN, fmt, args);
va_end(args);
spin_unlock_irqrestore(&resume_reason_lock, flags);
}
/* Detects a suspend and clears all the previous wake up reasons*/
static int wakeup_reason_pm_event(struct notifier_block *notifier,
unsigned long pm_event, void *unused)
{
unsigned long flags;
switch (pm_event) {
case PM_SUSPEND_PREPARE:
spin_lock_irqsave(&resume_reason_lock, flags);
irqcount = 0;
suspend_abort = false;
spin_unlock_irqrestore(&resume_reason_lock, flags);
/* monotonic time since boot */
last_monotime = ktime_get();
/* monotonic time since boot including the time spent in suspend */
last_stime = ktime_get_boottime();
break;
case PM_POST_SUSPEND:
/* monotonic time since boot */
curr_monotime = ktime_get();
/* monotonic time since boot including the time spent in suspend */
curr_stime = ktime_get_boottime();
break;
default:
break;
}
return NOTIFY_DONE;
}
static struct notifier_block wakeup_reason_pm_notifier_block = {
.notifier_call = wakeup_reason_pm_event,
};
/* Initializes the sysfs parameter
* registers the pm_event notifier
*/
int __init wakeup_reason_init(void)
{
int retval;
spin_lock_init(&resume_reason_lock);
retval = register_pm_notifier(&wakeup_reason_pm_notifier_block);
if (retval)
printk(KERN_WARNING "[%s] failed to register PM notifier %d\n",
__func__, retval);
wakeup_reason = kobject_create_and_add("wakeup_reasons", kernel_kobj);
if (!wakeup_reason) {
printk(KERN_WARNING "[%s] failed to create a sysfs kobject\n",
__func__);
return 1;
}
retval = sysfs_create_group(wakeup_reason, &attr_group);
if (retval) {
kobject_put(wakeup_reason);
printk(KERN_WARNING "[%s] failed to create a sysfs group %d\n",
__func__, retval);
}
return 0;
}
late_initcall(wakeup_reason_init);