* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
time, s390: Get rid of compile warning
dw_apb_timer: constify clocksource name
time: Cleanup old CONFIG_GENERIC_TIME references that snuck in
time: Change jiffies_to_clock_t() argument type to unsigned long
alarmtimers: Fix error handling
clocksource: Make watchdog reset lockless
posix-cpu-timers: Cure SMP accounting oddities
s390: Use direct ktime path for s390 clockevent device
clockevents: Add direct ktime programming function
clockevents: Make minimum delay adjustments configurable
nohz: Remove "Switched to NOHz mode" debugging messages
proc: Consider NO_HZ when printing idle and iowait times
nohz: Make idle/iowait counter update conditional
nohz: Fix update_ts_time_stat idle accounting
cputime: Clean up cputime_to_usecs and usecs_to_cputime macros
alarmtimers: Rework RTC device selection using class interface
alarmtimers: Add try_to_cancel functionality
alarmtimers: Add more refined alarm state tracking
alarmtimers: Remove period from alarm structure
alarmtimers: Remove interval cap limit hack
...
config ARCH_PRIMA2
bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
select CPU_V7
- select GENERIC_TIME
select NO_IOPORT
select GENERIC_CLOCKEVENTS
select CLKDEV_LOOKUP
select ARM_AMBA
select USB_ARCH_HAS_OHCI
select CLKDEV_LOOKUP
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
Support for the NXP LPC32XX family of processors
bool "NVIDIA Tegra"
select CLKDEV_LOOKUP
select CLKSRC_MMIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select GENERIC_GPIO
select HAVE_CLK
config ARCH_ZYNQ
bool "Xilinx Zynq ARM Cortex A9 Platform"
select CPU_V7
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select CLKDEV_LOOKUP
select ARM_GIC
config GENERIC_HWEIGHT
def_bool y
-config GENERIC_TIME
- def_bool y
-
config GENERIC_CLOCKEVENTS
def_bool y
set_clock_comparator(S390_lowcore.clock_comparator);
}
-static int s390_next_event(unsigned long delta,
+static int s390_next_ktime(ktime_t expires,
struct clock_event_device *evt)
{
- S390_lowcore.clock_comparator = get_clock() + delta;
+ u64 nsecs;
+
+ nsecs = ktime_to_ns(ktime_sub(expires, ktime_get_monotonic_offset()));
+ do_div(nsecs, 125);
+ S390_lowcore.clock_comparator = TOD_UNIX_EPOCH + (nsecs << 9);
set_clock_comparator(S390_lowcore.clock_comparator);
return 0;
}
cpu = smp_processor_id();
cd = &per_cpu(comparators, cpu);
cd->name = "comparator";
- cd->features = CLOCK_EVT_FEAT_ONESHOT;
+ cd->features = CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_KTIME;
cd->mult = 16777;
cd->shift = 12;
cd->min_delta_ns = 1;
cd->max_delta_ns = LONG_MAX;
cd->rating = 400;
cd->cpumask = cpumask_of(cpu);
- cd->set_next_event = s390_next_event;
+ cd->set_next_ktime = s390_next_ktime;
cd->set_mode = s390_set_mode;
clockevents_register_device(cd);
config SYS_SUPPORTS_HUGETLBFS
def_bool y
-config GENERIC_TIME
- def_bool y
-
config GENERIC_CLOCKEVENTS
def_bool y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_SYS_SUPPORTS_HUGETLBFS=y
-CONFIG_GENERIC_TIME=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_DEFAULT_MIGRATION_COST=10000000
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_SYS_SUPPORTS_HUGETLBFS=y
-CONFIG_GENERIC_TIME=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_DEFAULT_MIGRATION_COST=10000000
# CONFIG_STACKTRACE_SUPPORT is not set
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_GENERIC_BUG=y
-CONFIG_GENERIC_TIME=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_IRQ_RELEASE_METHOD=y
CONFIG_HZ=100
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
+ select GENERIC_CLOCKEVENTS_MIN_ADJUST
select IRQ_FORCED_THREADING
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_BPF_JIT if (X86_64 && NET)
# CONFIG_ARCH_HAS_ILOG2_U64 is not set
CONFIG_NO_IOPORT=y
CONFIG_HZ=100
-CONFIG_GENERIC_TIME=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_CONSTRUCTORS=y
# CONFIG_ARCH_HAS_ILOG2_U64 is not set
CONFIG_NO_IOPORT=y
CONFIG_HZ=100
-CONFIG_GENERIC_TIME=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
#
* dw_apb_clocksource_register() as the next step.
*/
struct dw_apb_clocksource *
-dw_apb_clocksource_init(unsigned rating, char *name, void __iomem *base,
+dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
unsigned long freq)
{
struct dw_apb_clocksource *dw_cs = kzalloc(sizeof(*dw_cs), GFP_KERNEL);
static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+ u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
if (idle_time == -1ULL)
return get_cpu_idle_time_jiffy(cpu, wall);
+ else
+ idle_time += get_cpu_iowait_time_us(cpu, wall);
return idle_time;
}
static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+ u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
if (idle_time == -1ULL)
return get_cpu_idle_time_jiffy(cpu, wall);
+ else
+ idle_time += get_cpu_iowait_time_us(cpu, wall);
return idle_time;
}
#include <linux/time.h>
#include <linux/irqnr.h>
#include <asm/cputime.h>
+#include <linux/tick.h>
#ifndef arch_irq_stat_cpu
#define arch_irq_stat_cpu(cpu) 0
#define arch_idle_time(cpu) 0
#endif
+static cputime64_t get_idle_time(int cpu)
+{
+ u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
+ cputime64_t idle;
+
+ if (idle_time == -1ULL) {
+ /* !NO_HZ so we can rely on cpustat.idle */
+ idle = kstat_cpu(cpu).cpustat.idle;
+ idle = cputime64_add(idle, arch_idle_time(cpu));
+ } else
+ idle = usecs_to_cputime(idle_time);
+
+ return idle;
+}
+
+static cputime64_t get_iowait_time(int cpu)
+{
+ u64 iowait_time = get_cpu_iowait_time_us(cpu, NULL);
+ cputime64_t iowait;
+
+ if (iowait_time == -1ULL)
+ /* !NO_HZ so we can rely on cpustat.iowait */
+ iowait = kstat_cpu(cpu).cpustat.iowait;
+ else
+ iowait = usecs_to_cputime(iowait_time);
+
+ return iowait;
+}
+
static int show_stat(struct seq_file *p, void *v)
{
int i, j;
user = cputime64_add(user, kstat_cpu(i).cpustat.user);
nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
system = cputime64_add(system, kstat_cpu(i).cpustat.system);
- idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
- idle = cputime64_add(idle, arch_idle_time(i));
- iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
+ idle = cputime64_add(idle, get_idle_time(i));
+ iowait = cputime64_add(iowait, get_iowait_time(i));
irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
(unsigned long long)cputime64_to_clock_t(guest),
(unsigned long long)cputime64_to_clock_t(guest_nice));
for_each_online_cpu(i) {
-
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
user = kstat_cpu(i).cpustat.user;
nice = kstat_cpu(i).cpustat.nice;
system = kstat_cpu(i).cpustat.system;
- idle = kstat_cpu(i).cpustat.idle;
- idle = cputime64_add(idle, arch_idle_time(i));
- iowait = kstat_cpu(i).cpustat.iowait;
+ idle = get_idle_time(i);
+ iowait = get_iowait_time(i);
irq = kstat_cpu(i).cpustat.irq;
softirq = kstat_cpu(i).cpustat.softirq;
steal = kstat_cpu(i).cpustat.steal;
/*
* Convert cputime to microseconds and back.
*/
-#define cputime_to_usecs(__ct) jiffies_to_usecs(__ct);
-#define usecs_to_cputime(__msecs) usecs_to_jiffies(__msecs);
+#define cputime_to_usecs(__ct) jiffies_to_usecs(__ct)
+#define usecs_to_cputime(__msecs) usecs_to_jiffies(__msecs)
/*
* Convert cputime to seconds and back.
ALARM_NUMTYPE,
};
+enum alarmtimer_restart {
+ ALARMTIMER_NORESTART,
+ ALARMTIMER_RESTART,
+};
+
+
+#define ALARMTIMER_STATE_INACTIVE 0x00
+#define ALARMTIMER_STATE_ENQUEUED 0x01
+#define ALARMTIMER_STATE_CALLBACK 0x02
+
/**
* struct alarm - Alarm timer structure
* @node: timerqueue node for adding to the event list this value
*/
struct alarm {
struct timerqueue_node node;
- ktime_t period;
- void (*function)(struct alarm *);
+ enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
enum alarmtimer_type type;
- bool enabled;
+ int state;
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);
+ enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
+void alarm_start(struct alarm *alarm, ktime_t start);
+int alarm_try_to_cancel(struct alarm *alarm);
+int alarm_cancel(struct alarm *alarm);
+
+u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
+
+/*
+ * A alarmtimer is active, when it is enqueued into timerqueue or the
+ * callback function is running.
+ */
+static inline int alarmtimer_active(const struct alarm *timer)
+{
+ return timer->state != ALARMTIMER_STATE_INACTIVE;
+}
+
+/*
+ * Helper function to check, whether the timer is on one of the queues
+ */
+static inline int alarmtimer_is_queued(struct alarm *timer)
+{
+ return timer->state & ALARMTIMER_STATE_ENQUEUED;
+}
+
+/*
+ * Helper function to check, whether the timer is running the callback
+ * function
+ */
+static inline int alarmtimer_callback_running(struct alarm *timer)
+{
+ return timer->state & ALARMTIMER_STATE_CALLBACK;
+}
+
#endif
*/
#define CLOCK_EVT_FEAT_PERIODIC 0x000001
#define CLOCK_EVT_FEAT_ONESHOT 0x000002
+#define CLOCK_EVT_FEAT_KTIME 0x000004
/*
* x86(64) specific misfeatures:
*
* - Clockevent source stops in C3 State and needs broadcast support.
* - Local APIC timer is used as a dummy device.
*/
-#define CLOCK_EVT_FEAT_C3STOP 0x000004
-#define CLOCK_EVT_FEAT_DUMMY 0x000008
+#define CLOCK_EVT_FEAT_C3STOP 0x000008
+#define CLOCK_EVT_FEAT_DUMMY 0x000010
/**
* struct clock_event_device - clock event device descriptor
* @event_handler: Assigned by the framework to be called by the low
* level handler of the event source
- * @set_next_event: set next event function
+ * @set_next_event: set next event function using a clocksource delta
+ * @set_next_ktime: set next event function using a direct ktime value
* @next_event: local storage for the next event in oneshot mode
* @max_delta_ns: maximum delta value in ns
* @min_delta_ns: minimum delta value in ns
void (*event_handler)(struct clock_event_device *);
int (*set_next_event)(unsigned long evt,
struct clock_event_device *);
+ int (*set_next_ktime)(ktime_t expires,
+ struct clock_event_device *);
ktime_t next_event;
u64 max_delta_ns;
u64 min_delta_ns;
enum clock_event_mode mode);
extern int clockevents_register_notifier(struct notifier_block *nb);
extern int clockevents_program_event(struct clock_event_device *dev,
- ktime_t expires, ktime_t now);
+ ktime_t expires, bool force);
extern void clockevents_handle_noop(struct clock_event_device *dev);
dw_apb_clockevent_init(int cpu, const char *name, unsigned rating,
void __iomem *base, int irq, unsigned long freq);
struct dw_apb_clocksource *
-dw_apb_clocksource_init(unsigned rating, char *name, void __iomem *base,
+dw_apb_clocksource_init(unsigned rating, const char *name, void __iomem *base,
unsigned long freq);
void dw_apb_clocksource_register(struct dw_apb_clocksource *dw_cs);
void dw_apb_clocksource_start(struct dw_apb_clocksource *dw_cs);
extern unsigned long timeval_to_jiffies(const struct timeval *value);
extern void jiffies_to_timeval(const unsigned long jiffies,
struct timeval *value);
-extern clock_t jiffies_to_clock_t(long x);
+extern clock_t jiffies_to_clock_t(unsigned long x);
extern unsigned long clock_t_to_jiffies(unsigned long x);
extern u64 jiffies_64_to_clock_t(u64 x);
extern u64 nsec_to_clock_t(u64 x);
unsigned long incr;
unsigned long expires;
} mmtimer;
- struct alarm alarmtimer;
+ struct {
+ struct alarm alarmtimer;
+ ktime_t interval;
+ } alarm;
struct rcu_head rcu;
} it;
};
/*
* Convert jiffies/jiffies_64 to clock_t and back.
*/
-clock_t jiffies_to_clock_t(long x)
+clock_t jiffies_to_clock_t(unsigned long x)
{
#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
# if HZ < USER_HZ
default y
depends on GENERIC_CLOCKEVENTS || GENERIC_CLOCKEVENTS_MIGR
+config GENERIC_CLOCKEVENTS_MIN_ADJUST
+ bool
static struct rtc_device *rtcdev;
static DEFINE_SPINLOCK(rtcdev_lock);
-/**
- * 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 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_get_rtcdev - Return selected rtcdevice
*
*/
static struct rtc_device *alarmtimer_get_rtcdev(void)
{
- struct device *dev;
- char *str;
unsigned long flags;
struct rtc_device *ret;
spin_lock_irqsave(&rtcdev_lock, flags);
- if (!rtcdev) {
- /* Find an rtc device and init the rtc_timer */
- dev = class_find_device(rtc_class, NULL, &str, has_wakealarm);
- /* If we have a device then str is valid. See has_wakealarm() */
- if (dev) {
- rtcdev = rtc_class_open(str);
- /*
- * Drop the reference we got in class_find_device,
- * rtc_open takes its own.
- */
- put_device(dev);
- rtc_timer_init(&rtctimer, NULL, NULL);
- }
- }
ret = rtcdev;
spin_unlock_irqrestore(&rtcdev_lock, flags);
return ret;
}
+
+
+static int alarmtimer_rtc_add_device(struct device *dev,
+ struct class_interface *class_intf)
+{
+ unsigned long flags;
+ struct rtc_device *rtc = to_rtc_device(dev);
+
+ if (rtcdev)
+ return -EBUSY;
+
+ if (!rtc->ops->set_alarm)
+ return -1;
+ if (!device_may_wakeup(rtc->dev.parent))
+ return -1;
+
+ spin_lock_irqsave(&rtcdev_lock, flags);
+ if (!rtcdev) {
+ rtcdev = rtc;
+ /* hold a reference so it doesn't go away */
+ get_device(dev);
+ }
+ spin_unlock_irqrestore(&rtcdev_lock, flags);
+ return 0;
+}
+
+static struct class_interface alarmtimer_rtc_interface = {
+ .add_dev = &alarmtimer_rtc_add_device,
+};
+
+static int alarmtimer_rtc_interface_setup(void)
+{
+ alarmtimer_rtc_interface.class = rtc_class;
+ return class_interface_register(&alarmtimer_rtc_interface);
+}
+static void alarmtimer_rtc_interface_remove(void)
+{
+ class_interface_unregister(&alarmtimer_rtc_interface);
+}
#else
-#define alarmtimer_get_rtcdev() (0)
-#define rtcdev (0)
+static inline struct rtc_device *alarmtimer_get_rtcdev(void)
+{
+ return NULL;
+}
+#define rtcdev (NULL)
+static inline int alarmtimer_rtc_interface_setup(void) { return 0; }
+static inline void alarmtimer_rtc_interface_remove(void) { }
#endif
-
/**
* alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
* @base: pointer to the base where the timer is being run
static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
{
timerqueue_add(&base->timerqueue, &alarm->node);
+ alarm->state |= ALARMTIMER_STATE_ENQUEUED;
+
if (&alarm->node == timerqueue_getnext(&base->timerqueue)) {
hrtimer_try_to_cancel(&base->timer);
hrtimer_start(&base->timer, alarm->node.expires,
{
struct timerqueue_node *next = timerqueue_getnext(&base->timerqueue);
+ if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))
+ return;
+
timerqueue_del(&base->timerqueue, &alarm->node);
+ alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
+
if (next == &alarm->node) {
hrtimer_try_to_cancel(&base->timer);
next = timerqueue_getnext(&base->timerqueue);
unsigned long flags;
ktime_t now;
int ret = HRTIMER_NORESTART;
+ int restart = ALARMTIMER_NORESTART;
spin_lock_irqsave(&base->lock, flags);
now = base->gettime();
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;
- }
+ alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
+
+ alarm->state |= ALARMTIMER_STATE_CALLBACK;
spin_unlock_irqrestore(&base->lock, flags);
if (alarm->function)
- alarm->function(alarm);
+ restart = alarm->function(alarm, now);
spin_lock_irqsave(&base->lock, flags);
+ alarm->state &= ~ALARMTIMER_STATE_CALLBACK;
+
+ if (restart != ALARMTIMER_NORESTART) {
+ timerqueue_add(&base->timerqueue, &alarm->node);
+ alarm->state |= ALARMTIMER_STATE_ENQUEUED;
+ }
}
if (next) {
freezer_delta = ktime_set(0, 0);
spin_unlock_irqrestore(&freezer_delta_lock, flags);
- rtc = rtcdev;
+ rtc = alarmtimer_get_rtcdev();
/* If we have no rtcdev, just return */
if (!rtc)
return 0;
* @function: callback that is run when the alarm fires
*/
void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
- void (*function)(struct alarm *))
+ enum alarmtimer_restart (*function)(struct alarm *, ktime_t))
{
timerqueue_init(&alarm->node);
- alarm->period = ktime_set(0, 0);
alarm->function = function;
alarm->type = type;
- alarm->enabled = 0;
+ alarm->state = ALARMTIMER_STATE_INACTIVE;
}
/**
* 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)
+void alarm_start(struct alarm *alarm, ktime_t start)
{
struct alarm_base *base = &alarm_bases[alarm->type];
unsigned long flags;
spin_lock_irqsave(&base->lock, flags);
- if (alarm->enabled)
+ if (alarmtimer_active(alarm))
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_try_to_cancel - Tries to cancel an alarm timer
* @alarm: ptr to alarm to be canceled
+ *
+ * Returns 1 if the timer was canceled, 0 if it was not running,
+ * and -1 if the callback was running
*/
-void alarm_cancel(struct alarm *alarm)
+int alarm_try_to_cancel(struct alarm *alarm)
{
struct alarm_base *base = &alarm_bases[alarm->type];
unsigned long flags;
-
+ int ret = -1;
spin_lock_irqsave(&base->lock, flags);
- if (alarm->enabled)
+
+ if (alarmtimer_callback_running(alarm))
+ goto out;
+
+ if (alarmtimer_is_queued(alarm)) {
alarmtimer_remove(base, alarm);
- alarm->enabled = 0;
+ ret = 1;
+ } else
+ ret = 0;
+out:
spin_unlock_irqrestore(&base->lock, flags);
+ return ret;
+}
+
+
+/**
+ * alarm_cancel - Spins trying to cancel an alarm timer until it is done
+ * @alarm: ptr to alarm to be canceled
+ *
+ * Returns 1 if the timer was canceled, 0 if it was not active.
+ */
+int alarm_cancel(struct alarm *alarm)
+{
+ for (;;) {
+ int ret = alarm_try_to_cancel(alarm);
+ if (ret >= 0)
+ return ret;
+ cpu_relax();
+ }
+}
+
+
+u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
+{
+ u64 overrun = 1;
+ ktime_t delta;
+
+ delta = ktime_sub(now, alarm->node.expires);
+
+ if (delta.tv64 < 0)
+ return 0;
+
+ if (unlikely(delta.tv64 >= interval.tv64)) {
+ s64 incr = ktime_to_ns(interval);
+
+ overrun = ktime_divns(delta, incr);
+
+ alarm->node.expires = ktime_add_ns(alarm->node.expires,
+ incr*overrun);
+
+ if (alarm->node.expires.tv64 > now.tv64)
+ return overrun;
+ /*
+ * This (and the ktime_add() below) is the
+ * correction for exact:
+ */
+ overrun++;
+ }
+
+ alarm->node.expires = ktime_add(alarm->node.expires, interval);
+ return overrun;
}
+
+
/**
* clock2alarm - helper that converts from clockid to alarmtypes
* @clockid: clockid.
*
* Posix timer callback for expired alarm timers.
*/
-static void alarm_handle_timer(struct alarm *alarm)
+static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
+ ktime_t now)
{
struct k_itimer *ptr = container_of(alarm, struct k_itimer,
- it.alarmtimer);
+ it.alarm.alarmtimer);
if (posix_timer_event(ptr, 0) != 0)
ptr->it_overrun++;
+
+ /* Re-add periodic timers */
+ if (ptr->it.alarm.interval.tv64) {
+ ptr->it_overrun += alarm_forward(alarm, now,
+ ptr->it.alarm.interval);
+ return ALARMTIMER_RESTART;
+ }
+ return ALARMTIMER_NORESTART;
}
/**
type = clock2alarm(new_timer->it_clock);
base = &alarm_bases[type];
- alarm_init(&new_timer->it.alarmtimer, type, alarm_handle_timer);
+ alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer);
return 0;
}
memset(cur_setting, 0, sizeof(struct itimerspec));
cur_setting->it_interval =
- ktime_to_timespec(timr->it.alarmtimer.period);
+ ktime_to_timespec(timr->it.alarm.interval);
cur_setting->it_value =
- ktime_to_timespec(timr->it.alarmtimer.node.expires);
+ ktime_to_timespec(timr->it.alarm.alarmtimer.node.expires);
return;
}
if (!rtcdev)
return -ENOTSUPP;
- alarm_cancel(&timr->it.alarmtimer);
+ if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0)
+ return TIMER_RETRY;
+
return 0;
}
if (!rtcdev)
return -ENOTSUPP;
- /*
- * XXX HACK! Currently we can DOS a system if the interval
- * period on alarmtimers is too small. Cap the interval here
- * to 100us and solve this properly in a future patch! -jstultz
- */
- if ((new_setting->it_interval.tv_sec == 0) &&
- (new_setting->it_interval.tv_nsec < 100000))
- new_setting->it_interval.tv_nsec = 100000;
-
if (old_setting)
alarm_timer_get(timr, old_setting);
/* If the timer was already set, cancel it */
- alarm_cancel(&timr->it.alarmtimer);
+ if (alarm_try_to_cancel(&timr->it.alarm.alarmtimer) < 0)
+ return TIMER_RETRY;
/* start the timer */
- alarm_start(&timr->it.alarmtimer,
- timespec_to_ktime(new_setting->it_value),
- timespec_to_ktime(new_setting->it_interval));
+ timr->it.alarm.interval = timespec_to_ktime(new_setting->it_interval);
+ alarm_start(&timr->it.alarm.alarmtimer,
+ timespec_to_ktime(new_setting->it_value));
return 0;
}
*
* Wakes up the task that set the alarmtimer
*/
-static void alarmtimer_nsleep_wakeup(struct alarm *alarm)
+static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,
+ ktime_t now)
{
struct task_struct *task = (struct task_struct *)alarm->data;
alarm->data = NULL;
if (task)
wake_up_process(task);
+ return ALARMTIMER_NORESTART;
}
/**
alarm->data = (void *)current;
do {
set_current_state(TASK_INTERRUPTIBLE);
- alarm_start(alarm, absexp, ktime_set(0, 0));
+ alarm_start(alarm, absexp);
if (likely(alarm->data))
schedule();
*/
static int __init alarmtimer_init(void)
{
+ struct platform_device *pdev;
int error = 0;
int i;
struct k_clock alarm_clock = {
HRTIMER_MODE_ABS);
alarm_bases[i].timer.function = alarmtimer_fired;
}
+
+ error = alarmtimer_rtc_interface_setup();
+ if (error)
+ return error;
+
error = platform_driver_register(&alarmtimer_driver);
- platform_device_register_simple("alarmtimer", -1, NULL, 0);
+ if (error)
+ goto out_if;
+ pdev = platform_device_register_simple("alarmtimer", -1, NULL, 0);
+ if (IS_ERR(pdev)) {
+ error = PTR_ERR(pdev);
+ goto out_drv;
+ }
+ return 0;
+
+out_drv:
+ platform_driver_unregister(&alarmtimer_driver);
+out_if:
+ alarmtimer_rtc_interface_remove();
return error;
}
device_initcall(alarmtimer_init);
-
dev->next_event.tv64 = KTIME_MAX;
}
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST
+
+/* Limit min_delta to a jiffie */
+#define MIN_DELTA_LIMIT (NSEC_PER_SEC / HZ)
+
+/**
+ * clockevents_increase_min_delta - raise minimum delta of a clock event device
+ * @dev: device to increase the minimum delta
+ *
+ * Returns 0 on success, -ETIME when the minimum delta reached the limit.
+ */
+static int clockevents_increase_min_delta(struct clock_event_device *dev)
+{
+ /* Nothing to do if we already reached the limit */
+ if (dev->min_delta_ns >= MIN_DELTA_LIMIT) {
+ printk(KERN_WARNING "CE: Reprogramming failure. Giving up\n");
+ dev->next_event.tv64 = KTIME_MAX;
+ return -ETIME;
+ }
+
+ if (dev->min_delta_ns < 5000)
+ dev->min_delta_ns = 5000;
+ else
+ dev->min_delta_ns += dev->min_delta_ns >> 1;
+
+ if (dev->min_delta_ns > MIN_DELTA_LIMIT)
+ dev->min_delta_ns = MIN_DELTA_LIMIT;
+
+ printk(KERN_WARNING "CE: %s increased min_delta_ns to %llu nsec\n",
+ dev->name ? dev->name : "?",
+ (unsigned long long) dev->min_delta_ns);
+ return 0;
+}
+
+/**
+ * clockevents_program_min_delta - Set clock event device to the minimum delay.
+ * @dev: device to program
+ *
+ * Returns 0 on success, -ETIME when the retry loop failed.
+ */
+static int clockevents_program_min_delta(struct clock_event_device *dev)
+{
+ unsigned long long clc;
+ int64_t delta;
+ int i;
+
+ for (i = 0;;) {
+ delta = dev->min_delta_ns;
+ dev->next_event = ktime_add_ns(ktime_get(), delta);
+
+ if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ return 0;
+
+ dev->retries++;
+ clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
+ if (dev->set_next_event((unsigned long) clc, dev) == 0)
+ return 0;
+
+ if (++i > 2) {
+ /*
+ * We tried 3 times to program the device with the
+ * given min_delta_ns. Try to increase the minimum
+ * delta, if that fails as well get out of here.
+ */
+ if (clockevents_increase_min_delta(dev))
+ return -ETIME;
+ i = 0;
+ }
+ }
+}
+
+#else /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
+
+/**
+ * clockevents_program_min_delta - Set clock event device to the minimum delay.
+ * @dev: device to program
+ *
+ * Returns 0 on success, -ETIME when the retry loop failed.
+ */
+static int clockevents_program_min_delta(struct clock_event_device *dev)
+{
+ unsigned long long clc;
+ int64_t delta;
+
+ delta = dev->min_delta_ns;
+ dev->next_event = ktime_add_ns(ktime_get(), delta);
+
+ if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ return 0;
+
+ dev->retries++;
+ clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
+ return dev->set_next_event((unsigned long) clc, dev);
+}
+
+#endif /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
+
/**
* clockevents_program_event - Reprogram the clock event device.
+ * @dev: device to program
* @expires: absolute expiry time (monotonic clock)
+ * @force: program minimum delay if expires can not be set
*
* Returns 0 on success, -ETIME when the event is in the past.
*/
int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
- ktime_t now)
+ bool force)
{
unsigned long long clc;
int64_t delta;
+ int rc;
if (unlikely(expires.tv64 < 0)) {
WARN_ON_ONCE(1);
return -ETIME;
}
- delta = ktime_to_ns(ktime_sub(expires, now));
-
- if (delta <= 0)
- return -ETIME;
-
dev->next_event = expires;
if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
return 0;
- if (delta > dev->max_delta_ns)
- delta = dev->max_delta_ns;
- if (delta < dev->min_delta_ns)
- delta = dev->min_delta_ns;
+ /* Shortcut for clockevent devices that can deal with ktime. */
+ if (dev->features & CLOCK_EVT_FEAT_KTIME)
+ return dev->set_next_ktime(expires, dev);
+
+ delta = ktime_to_ns(ktime_sub(expires, ktime_get()));
+ if (delta <= 0)
+ return force ? clockevents_program_min_delta(dev) : -ETIME;
- clc = delta * dev->mult;
- clc >>= dev->shift;
+ delta = min(delta, (int64_t) dev->max_delta_ns);
+ delta = max(delta, (int64_t) dev->min_delta_ns);
- return dev->set_next_event((unsigned long) clc, dev);
+ clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
+ rc = dev->set_next_event((unsigned long) clc, dev);
+
+ return (rc && force) ? clockevents_program_min_delta(dev) : rc;
}
/**
if (dev->mode != CLOCK_EVT_MODE_ONESHOT)
return 0;
- return clockevents_program_event(dev, dev->next_event, ktime_get());
+ return clockevents_program_event(dev, dev->next_event, false);
}
/*
static DECLARE_WORK(watchdog_work, clocksource_watchdog_work);
static DEFINE_SPINLOCK(watchdog_lock);
static int watchdog_running;
+static atomic_t watchdog_reset_pending;
static int clocksource_watchdog_kthread(void *data);
static void __clocksource_change_rating(struct clocksource *cs, int rating);
struct clocksource *cs;
cycle_t csnow, wdnow;
int64_t wd_nsec, cs_nsec;
- int next_cpu;
+ int next_cpu, reset_pending;
spin_lock(&watchdog_lock);
if (!watchdog_running)
goto out;
+ reset_pending = atomic_read(&watchdog_reset_pending);
+
list_for_each_entry(cs, &watchdog_list, wd_list) {
/* Clocksource already marked unstable? */
local_irq_enable();
/* Clocksource initialized ? */
- if (!(cs->flags & CLOCK_SOURCE_WATCHDOG)) {
+ if (!(cs->flags & CLOCK_SOURCE_WATCHDOG) ||
+ atomic_read(&watchdog_reset_pending)) {
cs->flags |= CLOCK_SOURCE_WATCHDOG;
cs->wd_last = wdnow;
cs->cs_last = csnow;
cs->cs_last = csnow;
cs->wd_last = wdnow;
+ if (atomic_read(&watchdog_reset_pending))
+ continue;
+
/* Check the deviation from the watchdog clocksource. */
- if (abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
+ if ((abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD)) {
clocksource_unstable(cs, cs_nsec - wd_nsec);
continue;
}
}
}
+ /*
+ * We only clear the watchdog_reset_pending, when we did a
+ * full cycle through all clocksources.
+ */
+ if (reset_pending)
+ atomic_dec(&watchdog_reset_pending);
+
/*
* Cycle through CPUs to check if the CPUs stay synchronized
* to each other.
static void clocksource_resume_watchdog(void)
{
- unsigned long flags;
-
- /*
- * We use trylock here to avoid a potential dead lock when
- * kgdb calls this code after the kernel has been stopped with
- * watchdog_lock held. When watchdog_lock is held we just
- * return and accept, that the watchdog might trigger and mark
- * the monitored clock source (usually TSC) unstable.
- *
- * This does not affect the other caller clocksource_resume()
- * because at this point the kernel is UP, interrupts are
- * disabled and nothing can hold watchdog_lock.
- */
- if (!spin_trylock_irqsave(&watchdog_lock, flags))
- return;
- clocksource_reset_watchdog();
- spin_unlock_irqrestore(&watchdog_lock, flags);
+ atomic_inc(&watchdog_reset_pending);
}
static void clocksource_enqueue_watchdog(struct clocksource *cs)
for (next = dev->next_event; ;) {
next = ktime_add(next, tick_period);
- if (!clockevents_program_event(dev, next, ktime_get()))
+ if (!clockevents_program_event(dev, next, false))
return;
tick_do_periodic_broadcast();
}
{
struct clock_event_device *bc = tick_broadcast_device.evtdev;
- return tick_dev_program_event(bc, expires, force);
+ return clockevents_program_event(bc, expires, force);
}
int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
*/
next = ktime_add(dev->next_event, tick_period);
for (;;) {
- if (!clockevents_program_event(dev, next, ktime_get()))
+ if (!clockevents_program_event(dev, next, false))
return;
/*
* Have to be careful here. If we're in oneshot mode,
clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
for (;;) {
- if (!clockevents_program_event(dev, next, ktime_get()))
+ if (!clockevents_program_event(dev, next, false))
return;
next = ktime_add(next, tick_period);
}
extern void tick_setup_oneshot(struct clock_event_device *newdev,
void (*handler)(struct clock_event_device *),
ktime_t nextevt);
-extern int tick_dev_program_event(struct clock_event_device *dev,
- ktime_t expires, int force);
extern int tick_program_event(ktime_t expires, int force);
extern void tick_oneshot_notify(void);
extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
#include "tick-internal.h"
-/* Limit min_delta to a jiffie */
-#define MIN_DELTA_LIMIT (NSEC_PER_SEC / HZ)
-
-static int tick_increase_min_delta(struct clock_event_device *dev)
-{
- /* Nothing to do if we already reached the limit */
- if (dev->min_delta_ns >= MIN_DELTA_LIMIT)
- return -ETIME;
-
- if (dev->min_delta_ns < 5000)
- dev->min_delta_ns = 5000;
- else
- dev->min_delta_ns += dev->min_delta_ns >> 1;
-
- if (dev->min_delta_ns > MIN_DELTA_LIMIT)
- dev->min_delta_ns = MIN_DELTA_LIMIT;
-
- printk(KERN_WARNING "CE: %s increased min_delta_ns to %llu nsec\n",
- dev->name ? dev->name : "?",
- (unsigned long long) dev->min_delta_ns);
- return 0;
-}
-
-/**
- * tick_program_event internal worker function
- */
-int tick_dev_program_event(struct clock_event_device *dev, ktime_t expires,
- int force)
-{
- ktime_t now = ktime_get();
- int i;
-
- for (i = 0;;) {
- int ret = clockevents_program_event(dev, expires, now);
-
- if (!ret || !force)
- return ret;
-
- dev->retries++;
- /*
- * We tried 3 times to program the device with the given
- * min_delta_ns. If that's not working then we increase it
- * and emit a warning.
- */
- if (++i > 2) {
- /* Increase the min. delta and try again */
- if (tick_increase_min_delta(dev)) {
- /*
- * Get out of the loop if min_delta_ns
- * hit the limit already. That's
- * better than staying here forever.
- *
- * We clear next_event so we have a
- * chance that the box survives.
- */
- printk(KERN_WARNING
- "CE: Reprogramming failure. Giving up\n");
- dev->next_event.tv64 = KTIME_MAX;
- return -ETIME;
- }
- i = 0;
- }
-
- now = ktime_get();
- expires = ktime_add_ns(now, dev->min_delta_ns);
- }
-}
-
/**
* tick_program_event
*/
{
struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
- return tick_dev_program_event(dev, expires, force);
+ return clockevents_program_event(dev, expires, force);
}
/**
*/
void tick_resume_oneshot(void)
{
- struct tick_device *td = &__get_cpu_var(tick_cpu_device);
- struct clock_event_device *dev = td->evtdev;
+ struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
- tick_program_event(ktime_get(), 1);
+ clockevents_program_event(dev, ktime_get(), true);
}
/**
{
newdev->event_handler = handler;
clockevents_set_mode(newdev, CLOCK_EVT_MODE_ONESHOT);
- tick_dev_program_event(newdev, next_event, 1);
+ clockevents_program_event(newdev, next_event, true);
}
/**
if (ts->idle_active) {
delta = ktime_sub(now, ts->idle_entrytime);
- ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
if (nr_iowait_cpu(cpu) > 0)
ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);
+ else
+ ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
ts->idle_entrytime = now;
}
/**
* get_cpu_idle_time_us - get the total idle time of a cpu
* @cpu: CPU number to query
- * @last_update_time: variable to store update time in
+ * @last_update_time: variable to store update time in. Do not update
+ * counters if NULL.
*
* Return the cummulative idle time (since boot) for a given
- * CPU, in microseconds. The idle time returned includes
- * the iowait time (unlike what "top" and co report).
+ * CPU, in microseconds.
*
* This time is measured via accounting rather than sampling,
* and is as accurate as ktime_get() is.
u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ ktime_t now, idle;
if (!tick_nohz_enabled)
return -1;
- update_ts_time_stats(cpu, ts, ktime_get(), last_update_time);
+ now = ktime_get();
+ if (last_update_time) {
+ update_ts_time_stats(cpu, ts, now, last_update_time);
+ idle = ts->idle_sleeptime;
+ } else {
+ if (ts->idle_active && !nr_iowait_cpu(cpu)) {
+ ktime_t delta = ktime_sub(now, ts->idle_entrytime);
+
+ idle = ktime_add(ts->idle_sleeptime, delta);
+ } else {
+ idle = ts->idle_sleeptime;
+ }
+ }
+
+ return ktime_to_us(idle);
- return ktime_to_us(ts->idle_sleeptime);
}
EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
-/*
+/**
* get_cpu_iowait_time_us - get the total iowait time of a cpu
* @cpu: CPU number to query
- * @last_update_time: variable to store update time in
+ * @last_update_time: variable to store update time in. Do not update
+ * counters if NULL.
*
* Return the cummulative iowait time (since boot) for a given
* CPU, in microseconds.
u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ ktime_t now, iowait;
if (!tick_nohz_enabled)
return -1;
- update_ts_time_stats(cpu, ts, ktime_get(), last_update_time);
+ now = ktime_get();
+ if (last_update_time) {
+ update_ts_time_stats(cpu, ts, now, last_update_time);
+ iowait = ts->iowait_sleeptime;
+ } else {
+ if (ts->idle_active && nr_iowait_cpu(cpu) > 0) {
+ ktime_t delta = ktime_sub(now, ts->idle_entrytime);
- return ktime_to_us(ts->iowait_sleeptime);
+ iowait = ktime_add(ts->iowait_sleeptime, delta);
+ } else {
+ iowait = ts->iowait_sleeptime;
+ }
+ }
+
+ return ktime_to_us(iowait);
}
EXPORT_SYMBOL_GPL(get_cpu_iowait_time_us);
next = ktime_add(next, tick_period);
}
local_irq_enable();
-
- printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id());
}
/*
}
#ifdef CONFIG_NO_HZ
- if (tick_nohz_enabled) {
+ if (tick_nohz_enabled)
ts->nohz_mode = NOHZ_MODE_HIGHRES;
- printk(KERN_INFO "Switched to NOHz mode on CPU #%d\n", smp_processor_id());
- }
#endif
}
#endif /* HIGH_RES_TIMERS */
projects / ~andy / linux / commitdiff