forked from luck/tmp_suning_uos_patched
rtc: Add tracepoints for RTC system
It will be more helpful to add some tracepoints to track RTC actions when debugging RTC driver. Below sample is that we set/read the RTC time, then set 2 alarms, so we can see the trace logs: set/read RTC time: kworker/0:1-67 [000] 21.814245: rtc_set_time: UTC (1510301580) (0) kworker/0:1-67 [000] 21.814312: rtc_read_time: UTC (1510301580) (0) set the first alarm timer: kworker/0:1-67 [000] 21.829238: rtc_timer_enqueue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0 kworker/0:1-67 [000] 22.018279: rtc_set_alarm: UTC (1510301700) (0) set the second alarm timer: kworker/0:1-67 [000] 22.230284: rtc_timer_enqueue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0 the first alarm timer was expired: kworker/0:1-67 [000] 145.155584: rtc_timer_dequeue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0 kworker/0:1-67 [000] 145.155593: rtc_timer_fired: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0 kworker/0:1-67 [000] 145.172504: rtc_set_alarm: UTC (1510301820) (0) the second alarm timer was expired: kworker/0:1-67 [000] 269.102353: rtc_timer_dequeue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0 kworker/0:1-67 [000] 269.102360: rtc_timer_fired: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0 disable alarm irq: kworker/0:1-67 [000] 269.102469: rtc_alarm_irq_enable: disable RTC alarm IRQ (0) Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Baolin Wang
Alexandre Belloni
parent
7928b2cbe5
commit
29a1f599c0
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@ -17,6 +17,9 @@
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#include <linux/log2.h>
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#include <linux/workqueue.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/rtc.h>
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static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer);
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static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer);
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@ -53,6 +56,8 @@ int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
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err = __rtc_read_time(rtc, tm);
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_read_time(rtc_tm_to_time64(tm), err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_time);
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@ -87,6 +92,8 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
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mutex_unlock(&rtc->ops_lock);
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/* A timer might have just expired */
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schedule_work(&rtc->irqwork);
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trace_rtc_set_time(rtc_tm_to_time64(tm), err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_time);
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@ -119,6 +126,8 @@ static int rtc_read_alarm_internal(struct rtc_device *rtc, struct rtc_wkalrm *al
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}
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_read_alarm(rtc_tm_to_time64(&alarm->time), err);
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return err;
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}
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@ -316,6 +325,7 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
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}
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_read_alarm(rtc_tm_to_time64(&alarm->time), err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_alarm);
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@ -352,6 +362,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
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else
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err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
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trace_rtc_set_alarm(rtc_tm_to_time64(&alarm->time), err);
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return err;
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}
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@ -406,6 +417,7 @@ int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
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rtc->aie_timer.enabled = 1;
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timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node);
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trace_rtc_timer_enqueue(&rtc->aie_timer);
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}
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mutex_unlock(&rtc->ops_lock);
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return err;
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@ -435,6 +447,8 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)
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err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled);
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_alarm_irq_enable(enabled, err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_alarm_irq_enable);
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@ -709,6 +723,8 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled
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rtc->pie_enabled = enabled;
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}
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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trace_rtc_irq_set_state(enabled, err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_set_state);
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@ -745,6 +761,8 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
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}
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}
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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trace_rtc_irq_set_freq(freq, err);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_set_freq);
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@ -779,6 +797,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
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}
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timerqueue_add(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_enqueue(timer);
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if (!next || ktime_before(timer->node.expires, next->expires)) {
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struct rtc_wkalrm alarm;
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int err;
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@ -790,6 +809,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
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schedule_work(&rtc->irqwork);
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} else if (err) {
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timerqueue_del(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_dequeue(timer);
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timer->enabled = 0;
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return err;
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}
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@ -803,6 +823,7 @@ static void rtc_alarm_disable(struct rtc_device *rtc)
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return;
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rtc->ops->alarm_irq_enable(rtc->dev.parent, false);
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trace_rtc_alarm_irq_enable(0, 0);
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}
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/**
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@ -821,6 +842,7 @@ static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer)
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{
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struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue);
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timerqueue_del(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_dequeue(timer);
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timer->enabled = 0;
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if (next == &timer->node) {
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struct rtc_wkalrm alarm;
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@ -871,16 +893,19 @@ void rtc_timer_do_work(struct work_struct *work)
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/* expire timer */
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timer = container_of(next, struct rtc_timer, node);
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timerqueue_del(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_dequeue(timer);
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timer->enabled = 0;
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if (timer->task.func)
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timer->task.func(timer->task.private_data);
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trace_rtc_timer_fired(timer);
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/* Re-add/fwd periodic timers */
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if (ktime_to_ns(timer->period)) {
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timer->node.expires = ktime_add(timer->node.expires,
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timer->period);
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timer->enabled = 1;
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timerqueue_add(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_enqueue(timer);
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}
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}
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@ -902,6 +927,7 @@ void rtc_timer_do_work(struct work_struct *work)
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timer = container_of(next, struct rtc_timer, node);
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timerqueue_del(&rtc->timerqueue, &timer->node);
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trace_rtc_timer_dequeue(timer);
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timer->enabled = 0;
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dev_err(&rtc->dev, "__rtc_set_alarm: err=%d\n", err);
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goto again;
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@ -992,6 +1018,8 @@ int rtc_read_offset(struct rtc_device *rtc, long *offset)
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mutex_lock(&rtc->ops_lock);
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ret = rtc->ops->read_offset(rtc->dev.parent, offset);
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_read_offset(*offset, ret);
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return ret;
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}
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@ -1025,5 +1053,7 @@ int rtc_set_offset(struct rtc_device *rtc, long offset)
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mutex_lock(&rtc->ops_lock);
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ret = rtc->ops->set_offset(rtc->dev.parent, offset);
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mutex_unlock(&rtc->ops_lock);
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trace_rtc_set_offset(offset, ret);
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return ret;
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}
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206
include/trace/events/rtc.h
Normal file
206
include/trace/events/rtc.h
Normal file
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@ -0,0 +1,206 @@
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM rtc
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#if !defined(_TRACE_RTC_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_RTC_H
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#include <linux/rtc.h>
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#include <linux/tracepoint.h>
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DECLARE_EVENT_CLASS(rtc_time_alarm_class,
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TP_PROTO(time64_t secs, int err),
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TP_ARGS(secs, err),
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TP_STRUCT__entry(
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__field(time64_t, secs)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->secs = secs;
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__entry->err = err;
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),
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TP_printk("UTC (%lld) (%d)",
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__entry->secs, __entry->err
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)
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);
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DEFINE_EVENT(rtc_time_alarm_class, rtc_set_time,
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TP_PROTO(time64_t secs, int err),
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TP_ARGS(secs, err)
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);
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DEFINE_EVENT(rtc_time_alarm_class, rtc_read_time,
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TP_PROTO(time64_t secs, int err),
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TP_ARGS(secs, err)
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);
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DEFINE_EVENT(rtc_time_alarm_class, rtc_set_alarm,
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TP_PROTO(time64_t secs, int err),
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TP_ARGS(secs, err)
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);
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DEFINE_EVENT(rtc_time_alarm_class, rtc_read_alarm,
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TP_PROTO(time64_t secs, int err),
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TP_ARGS(secs, err)
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);
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TRACE_EVENT(rtc_irq_set_freq,
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TP_PROTO(int freq, int err),
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TP_ARGS(freq, err),
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TP_STRUCT__entry(
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__field(int, freq)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->freq = freq;
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__entry->err = err;
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),
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TP_printk("set RTC periodic IRQ frequency:%u (%d)",
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__entry->freq, __entry->err
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)
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);
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TRACE_EVENT(rtc_irq_set_state,
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TP_PROTO(int enabled, int err),
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TP_ARGS(enabled, err),
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TP_STRUCT__entry(
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__field(int, enabled)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->enabled = enabled;
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__entry->err = err;
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),
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TP_printk("%s RTC 2^N Hz periodic IRQs (%d)",
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__entry->enabled ? "enable" : "disable",
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__entry->err
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)
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);
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TRACE_EVENT(rtc_alarm_irq_enable,
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TP_PROTO(unsigned int enabled, int err),
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TP_ARGS(enabled, err),
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TP_STRUCT__entry(
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__field(unsigned int, enabled)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->enabled = enabled;
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__entry->err = err;
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),
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TP_printk("%s RTC alarm IRQ (%d)",
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__entry->enabled ? "enable" : "disable",
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__entry->err
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)
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);
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DECLARE_EVENT_CLASS(rtc_offset_class,
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TP_PROTO(long offset, int err),
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TP_ARGS(offset, err),
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TP_STRUCT__entry(
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__field(long, offset)
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__field(int, err)
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),
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TP_fast_assign(
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__entry->offset = offset;
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__entry->err = err;
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),
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TP_printk("RTC offset: %ld (%d)",
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__entry->offset, __entry->err
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)
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);
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DEFINE_EVENT(rtc_offset_class, rtc_set_offset,
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TP_PROTO(long offset, int err),
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TP_ARGS(offset, err)
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);
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DEFINE_EVENT(rtc_offset_class, rtc_read_offset,
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TP_PROTO(long offset, int err),
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TP_ARGS(offset, err)
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);
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DECLARE_EVENT_CLASS(rtc_timer_class,
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TP_PROTO(struct rtc_timer *timer),
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TP_ARGS(timer),
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TP_STRUCT__entry(
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__field(struct rtc_timer *, timer)
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__field(ktime_t, expires)
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__field(ktime_t, period)
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),
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TP_fast_assign(
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__entry->timer = timer;
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__entry->expires = timer->node.expires;
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__entry->period = timer->period;
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),
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TP_printk("RTC timer:(%p) expires:%lld period:%lld",
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__entry->timer, __entry->expires, __entry->period
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)
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);
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DEFINE_EVENT(rtc_timer_class, rtc_timer_enqueue,
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TP_PROTO(struct rtc_timer *timer),
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TP_ARGS(timer)
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);
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DEFINE_EVENT(rtc_timer_class, rtc_timer_dequeue,
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TP_PROTO(struct rtc_timer *timer),
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TP_ARGS(timer)
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);
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DEFINE_EVENT(rtc_timer_class, rtc_timer_fired,
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TP_PROTO(struct rtc_timer *timer),
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TP_ARGS(timer)
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);
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#endif /* _TRACE_RTC_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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