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360 lines
8.6 KiB
360 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* List pending timers |
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* |
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* Copyright(C) 2006, Red Hat, Inc., Ingo Molnar |
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*/ |
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#include <linux/proc_fs.h> |
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#include <linux/module.h> |
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#include <linux/spinlock.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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#include <linux/kallsyms.h> |
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#include <linux/nmi.h> |
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#include <linux/uaccess.h> |
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#include "tick-internal.h" |
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struct timer_list_iter { |
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int cpu; |
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bool second_pass; |
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u64 now; |
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}; |
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/* |
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* This allows printing both to /proc/timer_list and |
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* to the console (on SysRq-Q): |
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*/ |
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__printf(2, 3) |
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static void SEQ_printf(struct seq_file *m, const char *fmt, ...) |
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{ |
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va_list args; |
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va_start(args, fmt); |
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if (m) |
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seq_vprintf(m, fmt, args); |
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else |
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vprintk(fmt, args); |
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va_end(args); |
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} |
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static void |
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print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
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int idx, u64 now) |
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{ |
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SEQ_printf(m, " #%d: <%pK>, %ps", idx, taddr, timer->function); |
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SEQ_printf(m, ", S:%02x", timer->state); |
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SEQ_printf(m, "\n"); |
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SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", |
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(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)), |
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(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
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(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
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(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
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} |
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static void |
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print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, |
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u64 now) |
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{ |
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struct hrtimer *timer, tmp; |
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unsigned long next = 0, i; |
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struct timerqueue_node *curr; |
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unsigned long flags; |
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next_one: |
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i = 0; |
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touch_nmi_watchdog(); |
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raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
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curr = timerqueue_getnext(&base->active); |
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/* |
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* Crude but we have to do this O(N*N) thing, because |
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* we have to unlock the base when printing: |
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*/ |
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while (curr && i < next) { |
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curr = timerqueue_iterate_next(curr); |
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i++; |
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} |
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if (curr) { |
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timer = container_of(curr, struct hrtimer, node); |
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tmp = *timer; |
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raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
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print_timer(m, timer, &tmp, i, now); |
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next++; |
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goto next_one; |
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} |
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raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
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} |
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static void |
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print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) |
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{ |
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SEQ_printf(m, " .base: %pK\n", base); |
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SEQ_printf(m, " .index: %d\n", base->index); |
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SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution); |
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SEQ_printf(m, " .get_time: %ps\n", base->get_time); |
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#ifdef CONFIG_HIGH_RES_TIMERS |
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SEQ_printf(m, " .offset: %Lu nsecs\n", |
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(unsigned long long) ktime_to_ns(base->offset)); |
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#endif |
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SEQ_printf(m, "active timers:\n"); |
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print_active_timers(m, base, now + ktime_to_ns(base->offset)); |
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} |
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static void print_cpu(struct seq_file *m, int cpu, u64 now) |
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{ |
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struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); |
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int i; |
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SEQ_printf(m, "cpu: %d\n", cpu); |
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for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
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SEQ_printf(m, " clock %d:\n", i); |
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print_base(m, cpu_base->clock_base + i, now); |
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} |
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#define P(x) \ |
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SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
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(unsigned long long)(cpu_base->x)) |
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#define P_ns(x) \ |
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SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
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(unsigned long long)(ktime_to_ns(cpu_base->x))) |
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#ifdef CONFIG_HIGH_RES_TIMERS |
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P_ns(expires_next); |
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P(hres_active); |
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P(nr_events); |
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P(nr_retries); |
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P(nr_hangs); |
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P(max_hang_time); |
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#endif |
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#undef P |
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#undef P_ns |
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#ifdef CONFIG_TICK_ONESHOT |
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# define P(x) \ |
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SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
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(unsigned long long)(ts->x)) |
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# define P_ns(x) \ |
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SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
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(unsigned long long)(ktime_to_ns(ts->x))) |
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{ |
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struct tick_sched *ts = tick_get_tick_sched(cpu); |
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P(nohz_mode); |
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P_ns(last_tick); |
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P(tick_stopped); |
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P(idle_jiffies); |
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P(idle_calls); |
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P(idle_sleeps); |
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P_ns(idle_entrytime); |
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P_ns(idle_waketime); |
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P_ns(idle_exittime); |
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P_ns(idle_sleeptime); |
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P_ns(iowait_sleeptime); |
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P(last_jiffies); |
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P(next_timer); |
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P_ns(idle_expires); |
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SEQ_printf(m, "jiffies: %Lu\n", |
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(unsigned long long)jiffies); |
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} |
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#endif |
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#undef P |
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#undef P_ns |
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SEQ_printf(m, "\n"); |
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} |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS |
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static void |
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print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
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{ |
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struct clock_event_device *dev = td->evtdev; |
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touch_nmi_watchdog(); |
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SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
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if (cpu < 0) |
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SEQ_printf(m, "Broadcast device\n"); |
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else |
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SEQ_printf(m, "Per CPU device: %d\n", cpu); |
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SEQ_printf(m, "Clock Event Device: "); |
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if (!dev) { |
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SEQ_printf(m, "<NULL>\n"); |
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return; |
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} |
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SEQ_printf(m, "%s\n", dev->name); |
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SEQ_printf(m, " max_delta_ns: %llu\n", |
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(unsigned long long) dev->max_delta_ns); |
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SEQ_printf(m, " min_delta_ns: %llu\n", |
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(unsigned long long) dev->min_delta_ns); |
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SEQ_printf(m, " mult: %u\n", dev->mult); |
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SEQ_printf(m, " shift: %u\n", dev->shift); |
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SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev)); |
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SEQ_printf(m, " next_event: %Ld nsecs\n", |
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(unsigned long long) ktime_to_ns(dev->next_event)); |
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SEQ_printf(m, " set_next_event: %ps\n", dev->set_next_event); |
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if (dev->set_state_shutdown) |
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SEQ_printf(m, " shutdown: %ps\n", |
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dev->set_state_shutdown); |
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if (dev->set_state_periodic) |
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SEQ_printf(m, " periodic: %ps\n", |
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dev->set_state_periodic); |
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if (dev->set_state_oneshot) |
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SEQ_printf(m, " oneshot: %ps\n", |
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dev->set_state_oneshot); |
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if (dev->set_state_oneshot_stopped) |
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SEQ_printf(m, " oneshot stopped: %ps\n", |
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dev->set_state_oneshot_stopped); |
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if (dev->tick_resume) |
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SEQ_printf(m, " resume: %ps\n", |
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dev->tick_resume); |
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SEQ_printf(m, " event_handler: %ps\n", dev->event_handler); |
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SEQ_printf(m, "\n"); |
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SEQ_printf(m, " retries: %lu\n", dev->retries); |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
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if (cpu >= 0) { |
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const struct clock_event_device *wd = tick_get_wakeup_device(cpu); |
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SEQ_printf(m, "Wakeup Device: %s\n", wd ? wd->name : "<NULL>"); |
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} |
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#endif |
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SEQ_printf(m, "\n"); |
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} |
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static void timer_list_show_tickdevices_header(struct seq_file *m) |
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{ |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
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print_tickdevice(m, tick_get_broadcast_device(), -1); |
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SEQ_printf(m, "tick_broadcast_mask: %*pb\n", |
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cpumask_pr_args(tick_get_broadcast_mask())); |
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#ifdef CONFIG_TICK_ONESHOT |
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SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n", |
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cpumask_pr_args(tick_get_broadcast_oneshot_mask())); |
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#endif |
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SEQ_printf(m, "\n"); |
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#endif |
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} |
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#endif |
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static inline void timer_list_header(struct seq_file *m, u64 now) |
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{ |
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SEQ_printf(m, "Timer List Version: v0.9\n"); |
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SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); |
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SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); |
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SEQ_printf(m, "\n"); |
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} |
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void sysrq_timer_list_show(void) |
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{ |
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u64 now = ktime_to_ns(ktime_get()); |
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int cpu; |
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timer_list_header(NULL, now); |
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for_each_online_cpu(cpu) |
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print_cpu(NULL, cpu, now); |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS |
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timer_list_show_tickdevices_header(NULL); |
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for_each_online_cpu(cpu) |
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print_tickdevice(NULL, tick_get_device(cpu), cpu); |
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#endif |
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return; |
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} |
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#ifdef CONFIG_PROC_FS |
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static int timer_list_show(struct seq_file *m, void *v) |
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{ |
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struct timer_list_iter *iter = v; |
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if (iter->cpu == -1 && !iter->second_pass) |
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timer_list_header(m, iter->now); |
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else if (!iter->second_pass) |
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print_cpu(m, iter->cpu, iter->now); |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS |
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else if (iter->cpu == -1 && iter->second_pass) |
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timer_list_show_tickdevices_header(m); |
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else |
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print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu); |
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#endif |
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return 0; |
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} |
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static void *move_iter(struct timer_list_iter *iter, loff_t offset) |
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{ |
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for (; offset; offset--) { |
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iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); |
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if (iter->cpu >= nr_cpu_ids) { |
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#ifdef CONFIG_GENERIC_CLOCKEVENTS |
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if (!iter->second_pass) { |
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iter->cpu = -1; |
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iter->second_pass = true; |
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} else |
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return NULL; |
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#else |
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return NULL; |
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#endif |
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} |
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} |
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return iter; |
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} |
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static void *timer_list_start(struct seq_file *file, loff_t *offset) |
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{ |
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struct timer_list_iter *iter = file->private; |
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if (!*offset) |
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iter->now = ktime_to_ns(ktime_get()); |
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iter->cpu = -1; |
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iter->second_pass = false; |
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return move_iter(iter, *offset); |
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} |
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static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) |
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{ |
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struct timer_list_iter *iter = file->private; |
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++*offset; |
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return move_iter(iter, 1); |
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} |
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static void timer_list_stop(struct seq_file *seq, void *v) |
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{ |
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} |
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static const struct seq_operations timer_list_sops = { |
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.start = timer_list_start, |
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.next = timer_list_next, |
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.stop = timer_list_stop, |
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.show = timer_list_show, |
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}; |
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static int __init init_timer_list_procfs(void) |
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{ |
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struct proc_dir_entry *pe; |
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pe = proc_create_seq_private("timer_list", 0400, NULL, &timer_list_sops, |
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sizeof(struct timer_list_iter), NULL); |
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if (!pe) |
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return -ENOMEM; |
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return 0; |
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} |
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__initcall(init_timer_list_procfs); |
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#endif
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