[GIT PULL] timers/core changes for v2.6.40

From: Ingo Molnar
Date: Thu May 19 2011 - 16:36:59 EST

Linus,

Please pull the latest timers-core-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git timers-core-for-linus

This, amongst other things, introduces a new ABI: alarm timers, via two new
clock IDs, CLOCK_REALTIME_ALARM and CLOCK_BOOTTIME_ALARM.

Thanks,

Ingo

------------------>
John Stultz (8):
time: Add timekeeping_inject_sleeptime
timers: Add rb_init_node() to allow for stack allocated rb nodes
timers: Introduce in-kernel alarm-timer interface
timers: Posix interface for alarm-timers
timers: Improve alarmtimer comments and minor fixes
timers: Remove delayed irqwork from alarmtimers implementation
timers: Fix alarmtimer build issues when CONFIG_RTC_CLASS=n
RTC: Disable CONFIG_RTC_CLASS from being built as a module

Mike Frysinger (1):
hrtimer: Make lookup table const


drivers/rtc/Kconfig | 7 +-
drivers/rtc/class.c | 23 +-
include/linux/alarmtimer.h | 40 +++
include/linux/capability.h | 7 +-
include/linux/posix-timers.h | 2 +
include/linux/rbtree.h | 8 +
include/linux/time.h | 3 +
include/linux/timerqueue.h | 2 +-
kernel/hrtimer.c | 2 +-
kernel/time/Makefile | 2 +-
kernel/time/alarmtimer.c | 694 ++++++++++++++++++++++++++++++++++++++++++
kernel/time/timekeeping.c | 56 ++++-
12 files changed, 820 insertions(+), 26 deletions(-)
create mode 100644 include/linux/alarmtimer.h
create mode 100644 kernel/time/alarmtimer.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e187887..4289172 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -3,10 +3,10 @@
#

config RTC_LIB
- tristate
+ bool

menuconfig RTC_CLASS
- tristate "Real Time Clock"
+ bool "Real Time Clock"
default n
depends on !S390
select RTC_LIB
@@ -15,9 +15,6 @@ menuconfig RTC_CLASS
be allowed to plug one or more RTCs to your system. You will
probably want to enable one or more of the interfaces below.

- This driver can also be built as a module. If so, the module
- will be called rtc-core.
-
if RTC_CLASS

config RTC_HCTOSYS
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 3901386..4194e59 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -41,26 +41,21 @@ static void rtc_device_release(struct device *dev)
* system's wall clock; restore it on resume().
*/

-static struct timespec delta;
static time_t oldtime;
+static struct timespec oldts;

static int rtc_suspend(struct device *dev, pm_message_t mesg)
{
struct rtc_device *rtc = to_rtc_device(dev);
struct rtc_time tm;
- struct timespec ts = current_kernel_time();

if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
return 0;

rtc_read_time(rtc, &tm);
+ ktime_get_ts(&oldts);
rtc_tm_to_time(&tm, &oldtime);

- /* RTC precision is 1 second; adjust delta for avg 1/2 sec err */
- set_normalized_timespec(&delta,
- ts.tv_sec - oldtime,
- ts.tv_nsec - (NSEC_PER_SEC >> 1));
-
return 0;
}

@@ -70,10 +65,12 @@ static int rtc_resume(struct device *dev)
struct rtc_time tm;
time_t newtime;
struct timespec time;
+ struct timespec newts;

if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
return 0;

+ ktime_get_ts(&newts);
rtc_read_time(rtc, &tm);
if (rtc_valid_tm(&tm) != 0) {
pr_debug("%s: bogus resume time\n", dev_name(&rtc->dev));
@@ -85,15 +82,13 @@ static int rtc_resume(struct device *dev)
pr_debug("%s: time travel!\n", dev_name(&rtc->dev));
return 0;
}
+ /* calculate the RTC time delta */
+ set_normalized_timespec(&time, newtime - oldtime, 0);

- /* restore wall clock using delta against this RTC;
- * adjust again for avg 1/2 second RTC sampling error
- */
- set_normalized_timespec(&time,
- newtime + delta.tv_sec,
- (NSEC_PER_SEC >> 1) + delta.tv_nsec);
- do_settimeofday(&time);
+ /* subtract kernel time between rtc_suspend to rtc_resume */
+ time = timespec_sub(time, timespec_sub(newts, oldts));

+ timekeeping_inject_sleeptime(&time);
return 0;
}

diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
new file mode 100644
index 0000000..c5d6095
--- /dev/null
+++ b/include/linux/alarmtimer.h
@@ -0,0 +1,40 @@
+#ifndef _LINUX_ALARMTIMER_H
+#define _LINUX_ALARMTIMER_H
+
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <linux/timerqueue.h>
+#include <linux/rtc.h>
+
+enum alarmtimer_type {
+ ALARM_REALTIME,
+ ALARM_BOOTTIME,
+
+ ALARM_NUMTYPE,
+};
+
+/**
+ * struct alarm - Alarm timer structure
+ * @node: timerqueue node for adding to the event list this value
+ * also includes the expiration time.
+ * @period: Period for recuring alarms
+ * @function: Function pointer to be executed when the timer fires.
+ * @type: Alarm type (BOOTTIME/REALTIME)
+ * @enabled: Flag that represents if the alarm is set to fire or not
+ * @data: Internal data value.
+ */
+struct alarm {
+ struct timerqueue_node node;
+ ktime_t period;
+ void (*function)(struct alarm *);
+ enum alarmtimer_type type;
+ bool enabled;
+ void *data;
+};
+
+void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
+ void (*function)(struct alarm *));
+void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period);
+void alarm_cancel(struct alarm *alarm);
+
+#endif
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 16ee8b4..7cb23ea 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -355,7 +355,12 @@ struct cpu_vfs_cap_data {

#define CAP_SYSLOG 34

-#define CAP_LAST_CAP CAP_SYSLOG
+/* Allow triggering something that will wake the system */
+
+#define CAP_WAKE_ALARM 35
+
+
+#define CAP_LAST_CAP CAP_WAKE_ALARM

#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index d51243a..808227d 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -5,6 +5,7 @@
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/timex.h>
+#include <linux/alarmtimer.h>

union cpu_time_count {
cputime_t cpu;
@@ -80,6 +81,7 @@ struct k_itimer {
unsigned long incr;
unsigned long expires;
} mmtimer;
+ struct alarm alarmtimer;
} it;
};

diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 7066acb..033b507 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -136,6 +136,14 @@ static inline void rb_set_color(struct rb_node *rb, int color)
#define RB_EMPTY_NODE(node) (rb_parent(node) == node)
#define RB_CLEAR_NODE(node) (rb_set_parent(node, node))

+static inline void rb_init_node(struct rb_node *rb)
+{
+ rb->rb_parent_color = 0;
+ rb->rb_right = NULL;
+ rb->rb_left = NULL;
+ RB_CLEAR_NODE(rb);
+}
+
extern void rb_insert_color(struct rb_node *, struct rb_root *);
extern void rb_erase(struct rb_node *, struct rb_root *);

diff --git a/include/linux/time.h b/include/linux/time.h
index 454a262..b306178 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -126,6 +126,7 @@ struct timespec __current_kernel_time(void); /* does not take xtime_lock */
struct timespec get_monotonic_coarse(void);
void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
struct timespec *wtom, struct timespec *sleep);
+void timekeeping_inject_sleeptime(struct timespec *delta);

#define CURRENT_TIME (current_kernel_time())
#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
@@ -294,6 +295,8 @@ struct itimerval {
#define CLOCK_REALTIME_COARSE 5
#define CLOCK_MONOTONIC_COARSE 6
#define CLOCK_BOOTTIME 7
+#define CLOCK_REALTIME_ALARM 8
+#define CLOCK_BOOTTIME_ALARM 9

/*
* The IDs of various hardware clocks:
diff --git a/include/linux/timerqueue.h b/include/linux/timerqueue.h
index a520fd7..5088727 100644
--- a/include/linux/timerqueue.h
+++ b/include/linux/timerqueue.h
@@ -39,7 +39,7 @@ struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)

static inline void timerqueue_init(struct timerqueue_node *node)
{
- RB_CLEAR_NODE(&node->node);
+ rb_init_node(&node->node);
}

static inline void timerqueue_init_head(struct timerqueue_head *head)
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 87fdb3f..dbbbf7d 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -81,7 +81,7 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
}
};

-static int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
+static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
[CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
[CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
[CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index b042599..e2fd74b 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -1,5 +1,5 @@
obj-y += timekeeping.o ntp.o clocksource.o jiffies.o timer_list.o timecompare.o
-obj-y += timeconv.o posix-clock.o
+obj-y += timeconv.o posix-clock.o alarmtimer.o

obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD) += clockevents.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
new file mode 100644
index 0000000..9265014
--- /dev/null
+++ b/kernel/time/alarmtimer.c
@@ -0,0 +1,694 @@
+/*
+ * Alarmtimer interface
+ *
+ * This interface provides a timer which is similarto hrtimers,
+ * but triggers a RTC alarm if the box is suspend.
+ *
+ * This interface is influenced by the Android RTC Alarm timer
+ * interface.
+ *
+ * Copyright (C) 2010 IBM Corperation
+ *
+ * Author: John Stultz <john.stultz@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <linux/timerqueue.h>
+#include <linux/rtc.h>
+#include <linux/alarmtimer.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/posix-timers.h>
+#include <linux/workqueue.h>
+#include <linux/freezer.h>
+
+/**
+ * struct alarm_base - Alarm timer bases
+ * @lock: Lock for syncrhonized access to the base
+ * @timerqueue: Timerqueue head managing the list of events
+ * @timer: hrtimer used to schedule events while running
+ * @gettime: Function to read the time correlating to the base
+ * @base_clockid: clockid for the base
+ */
+static struct alarm_base {
+ spinlock_t lock;
+ struct timerqueue_head timerqueue;
+ struct hrtimer timer;
+ ktime_t (*gettime)(void);
+ clockid_t base_clockid;
+} alarm_bases[ALARM_NUMTYPE];
+
+#ifdef CONFIG_RTC_CLASS
+/* rtc timer and device for setting alarm wakeups at suspend */
+static struct rtc_timer rtctimer;
+static struct rtc_device *rtcdev;
+#endif
+
+/* freezer delta & lock used to handle clock_nanosleep triggered wakeups */
+static ktime_t freezer_delta;
+static DEFINE_SPINLOCK(freezer_delta_lock);
+
+
+/**
+ * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
+ * @base: pointer to the base where the timer is being run
+ * @alarm: pointer to alarm being enqueued.
+ *
+ * Adds alarm to a alarm_base timerqueue and if necessary sets
+ * an hrtimer to run.
+ *
+ * Must hold base->lock when calling.
+ */
+static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
+{
+ timerqueue_add(&base->timerqueue, &alarm->node);
+ if (&alarm->node == timerqueue_getnext(&base->timerqueue)) {
+ hrtimer_try_to_cancel(&base->timer);
+ hrtimer_start(&base->timer, alarm->node.expires,
+ HRTIMER_MODE_ABS);
+ }
+}
+
+/**
+ * alarmtimer_remove - Removes an alarm timer from an alarm_base timerqueue
+ * @base: pointer to the base where the timer is running
+ * @alarm: pointer to alarm being removed
+ *
+ * Removes alarm to a alarm_base timerqueue and if necessary sets
+ * a new timer to run.
+ *
+ * Must hold base->lock when calling.
+ */
+static void alarmtimer_remove(struct alarm_base *base, struct alarm *alarm)
+{
+ struct timerqueue_node *next = timerqueue_getnext(&base->timerqueue);
+
+ timerqueue_del(&base->timerqueue, &alarm->node);
+ if (next == &alarm->node) {
+ hrtimer_try_to_cancel(&base->timer);
+ next = timerqueue_getnext(&base->timerqueue);
+ if (!next)
+ return;
+ hrtimer_start(&base->timer, next->expires, HRTIMER_MODE_ABS);
+ }
+}
+
+
+/**
+ * alarmtimer_fired - Handles alarm hrtimer being fired.
+ * @timer: pointer to hrtimer being run
+ *
+ * When a alarm timer fires, this runs through the timerqueue to
+ * see which alarms expired, and runs those. If there are more alarm
+ * timers queued for the future, we set the hrtimer to fire when
+ * when the next future alarm timer expires.
+ */
+static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
+{
+ struct alarm_base *base = container_of(timer, struct alarm_base, timer);
+ struct timerqueue_node *next;
+ unsigned long flags;
+ ktime_t now;
+ int ret = HRTIMER_NORESTART;
+
+ spin_lock_irqsave(&base->lock, flags);
+ now = base->gettime();
+ while ((next = timerqueue_getnext(&base->timerqueue))) {
+ struct alarm *alarm;
+ ktime_t expired = next->expires;
+
+ if (expired.tv64 >= now.tv64)
+ break;
+
+ alarm = container_of(next, struct alarm, node);
+
+ timerqueue_del(&base->timerqueue, &alarm->node);
+ alarm->enabled = 0;
+ /* Re-add periodic timers */
+ if (alarm->period.tv64) {
+ alarm->node.expires = ktime_add(expired, alarm->period);
+ timerqueue_add(&base->timerqueue, &alarm->node);
+ alarm->enabled = 1;
+ }
+ spin_unlock_irqrestore(&base->lock, flags);
+ if (alarm->function)
+ alarm->function(alarm);
+ spin_lock_irqsave(&base->lock, flags);
+ }
+
+ if (next) {
+ hrtimer_set_expires(&base->timer, next->expires);
+ ret = HRTIMER_RESTART;
+ }
+ spin_unlock_irqrestore(&base->lock, flags);
+
+ return ret;
+
+}
+
+#ifdef CONFIG_RTC_CLASS
+/**
+ * alarmtimer_suspend - Suspend time callback
+ * @dev: unused
+ * @state: unused
+ *
+ * When we are going into suspend, we look through the bases
+ * to see which is the soonest timer to expire. We then
+ * set an rtc timer to fire that far into the future, which
+ * will wake us from suspend.
+ */
+static int alarmtimer_suspend(struct device *dev)
+{
+ struct rtc_time tm;
+ ktime_t min, now;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&freezer_delta_lock, flags);
+ min = freezer_delta;
+ freezer_delta = ktime_set(0, 0);
+ spin_unlock_irqrestore(&freezer_delta_lock, flags);
+
+ /* If we have no rtcdev, just return */
+ if (!rtcdev)
+ return 0;
+
+ /* Find the soonest timer to expire*/
+ for (i = 0; i < ALARM_NUMTYPE; i++) {
+ struct alarm_base *base = &alarm_bases[i];
+ struct timerqueue_node *next;
+ ktime_t delta;
+
+ spin_lock_irqsave(&base->lock, flags);
+ next = timerqueue_getnext(&base->timerqueue);
+ spin_unlock_irqrestore(&base->lock, flags);
+ if (!next)
+ continue;
+ delta = ktime_sub(next->expires, base->gettime());
+ if (!min.tv64 || (delta.tv64 < min.tv64))
+ min = delta;
+ }
+ if (min.tv64 == 0)
+ return 0;
+
+ /* XXX - Should we enforce a minimum sleep time? */
+ WARN_ON(min.tv64 < NSEC_PER_SEC);
+
+ /* Setup an rtc timer to fire that far in the future */
+ rtc_timer_cancel(rtcdev, &rtctimer);
+ rtc_read_time(rtcdev, &tm);
+ now = rtc_tm_to_ktime(tm);
+ now = ktime_add(now, min);
+
+ rtc_timer_start(rtcdev, &rtctimer, now, ktime_set(0, 0));
+
+ return 0;
+}
+#else
+static int alarmtimer_suspend(struct device *dev)
+{
+ return 0;
+}
+#endif
+
+static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type)
+{
+ ktime_t delta;
+ unsigned long flags;
+ struct alarm_base *base = &alarm_bases[type];
+
+ delta = ktime_sub(absexp, base->gettime());
+
+ spin_lock_irqsave(&freezer_delta_lock, flags);
+ if (!freezer_delta.tv64 || (delta.tv64 < freezer_delta.tv64))
+ freezer_delta = delta;
+ spin_unlock_irqrestore(&freezer_delta_lock, flags);
+}
+
+
+/**
+ * alarm_init - Initialize an alarm structure
+ * @alarm: ptr to alarm to be initialized
+ * @type: the type of the alarm
+ * @function: callback that is run when the alarm fires
+ */
+void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
+ void (*function)(struct alarm *))
+{
+ timerqueue_init(&alarm->node);
+ alarm->period = ktime_set(0, 0);
+ alarm->function = function;
+ alarm->type = type;
+ alarm->enabled = 0;
+}
+
+/**
+ * alarm_start - Sets an alarm to fire
+ * @alarm: ptr to alarm to set
+ * @start: time to run the alarm
+ * @period: period at which the alarm will recur
+ */
+void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period)
+{
+ struct alarm_base *base = &alarm_bases[alarm->type];
+ unsigned long flags;
+
+ spin_lock_irqsave(&base->lock, flags);
+ if (alarm->enabled)
+ alarmtimer_remove(base, alarm);
+ alarm->node.expires = start;
+ alarm->period = period;
+ alarmtimer_enqueue(base, alarm);
+ alarm->enabled = 1;
+ spin_unlock_irqrestore(&base->lock, flags);
+}
+
+/**
+ * alarm_cancel - Tries to cancel an alarm timer
+ * @alarm: ptr to alarm to be canceled
+ */
+void alarm_cancel(struct alarm *alarm)
+{
+ struct alarm_base *base = &alarm_bases[alarm->type];
+ unsigned long flags;
+
+ spin_lock_irqsave(&base->lock, flags);
+ if (alarm->enabled)
+ alarmtimer_remove(base, alarm);
+ alarm->enabled = 0;
+ spin_unlock_irqrestore(&base->lock, flags);
+}
+
+
+/**
+ * clock2alarm - helper that converts from clockid to alarmtypes
+ * @clockid: clockid.
+ */
+static enum alarmtimer_type clock2alarm(clockid_t clockid)
+{
+ if (clockid == CLOCK_REALTIME_ALARM)
+ return ALARM_REALTIME;
+ if (clockid == CLOCK_BOOTTIME_ALARM)
+ return ALARM_BOOTTIME;
+ return -1;
+}
+
+/**
+ * alarm_handle_timer - Callback for posix timers
+ * @alarm: alarm that fired
+ *
+ * Posix timer callback for expired alarm timers.
+ */
+static void alarm_handle_timer(struct alarm *alarm)
+{
+ struct k_itimer *ptr = container_of(alarm, struct k_itimer,
+ it.alarmtimer);
+ if (posix_timer_event(ptr, 0) != 0)
+ ptr->it_overrun++;
+}
+
+/**
+ * alarm_clock_getres - posix getres interface
+ * @which_clock: clockid
+ * @tp: timespec to fill
+ *
+ * Returns the granularity of underlying alarm base clock
+ */
+static int alarm_clock_getres(const clockid_t which_clock, struct timespec *tp)
+{
+ clockid_t baseid = alarm_bases[clock2alarm(which_clock)].base_clockid;
+
+ return hrtimer_get_res(baseid, tp);
+}
+
+/**
+ * alarm_clock_get - posix clock_get interface
+ * @which_clock: clockid
+ * @tp: timespec to fill.
+ *
+ * Provides the underlying alarm base time.
+ */
+static int alarm_clock_get(clockid_t which_clock, struct timespec *tp)
+{
+ struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
+
+ *tp = ktime_to_timespec(base->gettime());
+ return 0;
+}
+
+/**
+ * alarm_timer_create - posix timer_create interface
+ * @new_timer: k_itimer pointer to manage
+ *
+ * Initializes the k_itimer structure.
+ */
+static int alarm_timer_create(struct k_itimer *new_timer)
+{
+ enum alarmtimer_type type;
+ struct alarm_base *base;
+
+ if (!capable(CAP_WAKE_ALARM))
+ return -EPERM;
+
+ type = clock2alarm(new_timer->it_clock);
+ base = &alarm_bases[type];
+ alarm_init(&new_timer->it.alarmtimer, type, alarm_handle_timer);
+ return 0;
+}
+
+/**
+ * alarm_timer_get - posix timer_get interface
+ * @new_timer: k_itimer pointer
+ * @cur_setting: itimerspec data to fill
+ *
+ * Copies the itimerspec data out from the k_itimer
+ */
+static void alarm_timer_get(struct k_itimer *timr,
+ struct itimerspec *cur_setting)
+{
+ cur_setting->it_interval =
+ ktime_to_timespec(timr->it.alarmtimer.period);
+ cur_setting->it_value =
+ ktime_to_timespec(timr->it.alarmtimer.node.expires);
+ return;
+}
+
+/**
+ * alarm_timer_del - posix timer_del interface
+ * @timr: k_itimer pointer to be deleted
+ *
+ * Cancels any programmed alarms for the given timer.
+ */
+static int alarm_timer_del(struct k_itimer *timr)
+{
+ alarm_cancel(&timr->it.alarmtimer);
+ return 0;
+}
+
+/**
+ * alarm_timer_set - posix timer_set interface
+ * @timr: k_itimer pointer to be deleted
+ * @flags: timer flags
+ * @new_setting: itimerspec to be used
+ * @old_setting: itimerspec being replaced
+ *
+ * Sets the timer to new_setting, and starts the timer.
+ */
+static int alarm_timer_set(struct k_itimer *timr, int flags,
+ struct itimerspec *new_setting,
+ struct itimerspec *old_setting)
+{
+ /* Save old values */
+ old_setting->it_interval =
+ ktime_to_timespec(timr->it.alarmtimer.period);
+ old_setting->it_value =
+ ktime_to_timespec(timr->it.alarmtimer.node.expires);
+
+ /* If the timer was already set, cancel it */
+ alarm_cancel(&timr->it.alarmtimer);
+
+ /* start the timer */
+ alarm_start(&timr->it.alarmtimer,
+ timespec_to_ktime(new_setting->it_value),
+ timespec_to_ktime(new_setting->it_interval));
+ return 0;
+}
+
+/**
+ * alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep
+ * @alarm: ptr to alarm that fired
+ *
+ * Wakes up the task that set the alarmtimer
+ */
+static void alarmtimer_nsleep_wakeup(struct alarm *alarm)
+{
+ struct task_struct *task = (struct task_struct *)alarm->data;
+
+ alarm->data = NULL;
+ if (task)
+ wake_up_process(task);
+}
+
+/**
+ * alarmtimer_do_nsleep - Internal alarmtimer nsleep implementation
+ * @alarm: ptr to alarmtimer
+ * @absexp: absolute expiration time
+ *
+ * Sets the alarm timer and sleeps until it is fired or interrupted.
+ */
+static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp)
+{
+ alarm->data = (void *)current;
+ do {
+ set_current_state(TASK_INTERRUPTIBLE);
+ alarm_start(alarm, absexp, ktime_set(0, 0));
+ if (likely(alarm->data))
+ schedule();
+
+ alarm_cancel(alarm);
+ } while (alarm->data && !signal_pending(current));
+
+ __set_current_state(TASK_RUNNING);
+
+ return (alarm->data == NULL);
+}
+
+
+/**
+ * update_rmtp - Update remaining timespec value
+ * @exp: expiration time
+ * @type: timer type
+ * @rmtp: user pointer to remaining timepsec value
+ *
+ * Helper function that fills in rmtp value with time between
+ * now and the exp value
+ */
+static int update_rmtp(ktime_t exp, enum alarmtimer_type type,
+ struct timespec __user *rmtp)
+{
+ struct timespec rmt;
+ ktime_t rem;
+
+ rem = ktime_sub(exp, alarm_bases[type].gettime());
+
+ if (rem.tv64 <= 0)
+ return 0;
+ rmt = ktime_to_timespec(rem);
+
+ if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
+ return -EFAULT;
+
+ return 1;
+
+}
+
+/**
+ * alarm_timer_nsleep_restart - restartblock alarmtimer nsleep
+ * @restart: ptr to restart block
+ *
+ * Handles restarted clock_nanosleep calls
+ */
+static long __sched alarm_timer_nsleep_restart(struct restart_block *restart)
+{
+ enum alarmtimer_type type = restart->nanosleep.index;
+ ktime_t exp;
+ struct timespec __user *rmtp;
+ struct alarm alarm;
+ int ret = 0;
+
+ exp.tv64 = restart->nanosleep.expires;
+ alarm_init(&alarm, type, alarmtimer_nsleep_wakeup);
+
+ if (alarmtimer_do_nsleep(&alarm, exp))
+ goto out;
+
+ if (freezing(current))
+ alarmtimer_freezerset(exp, type);
+
+ rmtp = restart->nanosleep.rmtp;
+ if (rmtp) {
+ ret = update_rmtp(exp, type, rmtp);
+ if (ret <= 0)
+ goto out;
+ }
+
+
+ /* The other values in restart are already filled in */
+ ret = -ERESTART_RESTARTBLOCK;
+out:
+ return ret;
+}
+
+/**
+ * alarm_timer_nsleep - alarmtimer nanosleep
+ * @which_clock: clockid
+ * @flags: determins abstime or relative
+ * @tsreq: requested sleep time (abs or rel)
+ * @rmtp: remaining sleep time saved
+ *
+ * Handles clock_nanosleep calls against _ALARM clockids
+ */
+static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
+ struct timespec *tsreq, struct timespec __user *rmtp)
+{
+ enum alarmtimer_type type = clock2alarm(which_clock);
+ struct alarm alarm;
+ ktime_t exp;
+ int ret = 0;
+ struct restart_block *restart;
+
+ if (!capable(CAP_WAKE_ALARM))
+ return -EPERM;
+
+ alarm_init(&alarm, type, alarmtimer_nsleep_wakeup);
+
+ exp = timespec_to_ktime(*tsreq);
+ /* Convert (if necessary) to absolute time */
+ if (flags != TIMER_ABSTIME) {
+ ktime_t now = alarm_bases[type].gettime();
+ exp = ktime_add(now, exp);
+ }
+
+ if (alarmtimer_do_nsleep(&alarm, exp))
+ goto out;
+
+ if (freezing(current))
+ alarmtimer_freezerset(exp, type);
+
+ /* abs timers don't set remaining time or restart */
+ if (flags == TIMER_ABSTIME) {
+ ret = -ERESTARTNOHAND;
+ goto out;
+ }
+
+ if (rmtp) {
+ ret = update_rmtp(exp, type, rmtp);
+ if (ret <= 0)
+ goto out;
+ }
+
+ restart = &current_thread_info()->restart_block;
+ restart->fn = alarm_timer_nsleep_restart;
+ restart->nanosleep.index = type;
+ restart->nanosleep.expires = exp.tv64;
+ restart->nanosleep.rmtp = rmtp;
+ ret = -ERESTART_RESTARTBLOCK;
+
+out:
+ return ret;
+}
+
+
+/* Suspend hook structures */
+static const struct dev_pm_ops alarmtimer_pm_ops = {
+ .suspend = alarmtimer_suspend,
+};
+
+static struct platform_driver alarmtimer_driver = {
+ .driver = {
+ .name = "alarmtimer",
+ .pm = &alarmtimer_pm_ops,
+ }
+};
+
+/**
+ * alarmtimer_init - Initialize alarm timer code
+ *
+ * This function initializes the alarm bases and registers
+ * the posix clock ids.
+ */
+static int __init alarmtimer_init(void)
+{
+ int error = 0;
+ int i;
+ struct k_clock alarm_clock = {
+ .clock_getres = alarm_clock_getres,
+ .clock_get = alarm_clock_get,
+ .timer_create = alarm_timer_create,
+ .timer_set = alarm_timer_set,
+ .timer_del = alarm_timer_del,
+ .timer_get = alarm_timer_get,
+ .nsleep = alarm_timer_nsleep,
+ };
+
+ posix_timers_register_clock(CLOCK_REALTIME_ALARM, &alarm_clock);
+ posix_timers_register_clock(CLOCK_BOOTTIME_ALARM, &alarm_clock);
+
+ /* Initialize alarm bases */
+ alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;
+ alarm_bases[ALARM_REALTIME].gettime = &ktime_get_real;
+ alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;
+ alarm_bases[ALARM_BOOTTIME].gettime = &ktime_get_boottime;
+ for (i = 0; i < ALARM_NUMTYPE; i++) {
+ timerqueue_init_head(&alarm_bases[i].timerqueue);
+ spin_lock_init(&alarm_bases[i].lock);
+ hrtimer_init(&alarm_bases[i].timer,
+ alarm_bases[i].base_clockid,
+ HRTIMER_MODE_ABS);
+ alarm_bases[i].timer.function = alarmtimer_fired;
+ }
+ error = platform_driver_register(&alarmtimer_driver);
+ platform_device_register_simple("alarmtimer", -1, NULL, 0);
+
+ return error;
+}
+device_initcall(alarmtimer_init);
+
+#ifdef CONFIG_RTC_CLASS
+/**
+ * has_wakealarm - check rtc device has wakealarm ability
+ * @dev: current device
+ * @name_ptr: name to be returned
+ *
+ * This helper function checks to see if the rtc device can wake
+ * from suspend.
+ */
+static int __init has_wakealarm(struct device *dev, void *name_ptr)
+{
+ struct rtc_device *candidate = to_rtc_device(dev);
+
+ if (!candidate->ops->set_alarm)
+ return 0;
+ if (!device_may_wakeup(candidate->dev.parent))
+ return 0;
+
+ *(const char **)name_ptr = dev_name(dev);
+ return 1;
+}
+
+/**
+ * alarmtimer_init_late - Late initializing of alarmtimer code
+ *
+ * This function locates a rtc device to use for wakealarms.
+ * Run as late_initcall to make sure rtc devices have been
+ * registered.
+ */
+static int __init alarmtimer_init_late(void)
+{
+ char *str;
+
+ /* Find an rtc device and init the rtc_timer */
+ class_find_device(rtc_class, NULL, &str, has_wakealarm);
+ if (str)
+ rtcdev = rtc_class_open(str);
+ if (!rtcdev) {
+ printk(KERN_WARNING "No RTC device found, ALARM timers will"
+ " not wake from suspend");
+ }
+ rtc_timer_init(&rtctimer, NULL, NULL);
+
+ return 0;
+}
+#else
+static int __init alarmtimer_init_late(void)
+{
+ printk(KERN_WARNING "Kernel not built with RTC support, ALARM timers"
+ " will not wake from suspend");
+ return 0;
+}
+#endif
+late_initcall(alarmtimer_init_late);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 8ad5d57..8e6a05a 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -596,6 +596,58 @@ void __init timekeeping_init(void)
static struct timespec timekeeping_suspend_time;

/**
+ * __timekeeping_inject_sleeptime - Internal function to add sleep interval
+ * @delta: pointer to a timespec delta value
+ *
+ * Takes a timespec offset measuring a suspend interval and properly
+ * adds the sleep offset to the timekeeping variables.
+ */
+static void __timekeeping_inject_sleeptime(struct timespec *delta)
+{
+ xtime = timespec_add(xtime, *delta);
+ wall_to_monotonic = timespec_sub(wall_to_monotonic, *delta);
+ total_sleep_time = timespec_add(total_sleep_time, *delta);
+}
+
+
+/**
+ * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values
+ * @delta: pointer to a timespec delta value
+ *
+ * This hook is for architectures that cannot support read_persistent_clock
+ * because their RTC/persistent clock is only accessible when irqs are enabled.
+ *
+ * This function should only be called by rtc_resume(), and allows
+ * a suspend offset to be injected into the timekeeping values.
+ */
+void timekeeping_inject_sleeptime(struct timespec *delta)
+{
+ unsigned long flags;
+ struct timespec ts;
+
+ /* Make sure we don't set the clock twice */
+ read_persistent_clock(&ts);
+ if (!(ts.tv_sec == 0 && ts.tv_nsec == 0))
+ return;
+
+ write_seqlock_irqsave(&xtime_lock, flags);
+ timekeeping_forward_now();
+
+ __timekeeping_inject_sleeptime(delta);
+
+ timekeeper.ntp_error = 0;
+ ntp_clear();
+ update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+ timekeeper.mult);
+
+ write_sequnlock_irqrestore(&xtime_lock, flags);
+
+ /* signal hrtimers about time change */
+ clock_was_set();
+}
+
+
+/**
* timekeeping_resume - Resumes the generic timekeeping subsystem.
*
* This is for the generic clocksource timekeeping.
@@ -615,9 +667,7 @@ static void timekeeping_resume(void)

if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
ts = timespec_sub(ts, timekeeping_suspend_time);
- xtime = timespec_add(xtime, ts);
- wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
- total_sleep_time = timespec_add(total_sleep_time, ts);
+ __timekeeping_inject_sleeptime(&ts);
}
/* re-base the last cycle value */
timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
--
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