381 lines
8.9 KiB
C
381 lines
8.9 KiB
C
// 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 print_name_offset(struct seq_file *m, void *sym)
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{
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char symname[KSYM_NAME_LEN];
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if (lookup_symbol_name((unsigned long)sym, symname) < 0)
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SEQ_printf(m, "<%pK>", sym);
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else
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SEQ_printf(m, "%s", symname);
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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: ", idx);
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print_name_offset(m, taddr);
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SEQ_printf(m, ", ");
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print_name_offset(m, 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: ");
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print_name_offset(m, base->get_time);
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SEQ_printf(m, "\n");
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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: ");
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print_name_offset(m, dev->set_next_event);
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SEQ_printf(m, "\n");
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if (dev->set_state_shutdown) {
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SEQ_printf(m, " shutdown: ");
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print_name_offset(m, dev->set_state_shutdown);
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SEQ_printf(m, "\n");
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}
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if (dev->set_state_periodic) {
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SEQ_printf(m, " periodic: ");
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print_name_offset(m, dev->set_state_periodic);
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SEQ_printf(m, "\n");
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}
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if (dev->set_state_oneshot) {
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SEQ_printf(m, " oneshot: ");
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print_name_offset(m, dev->set_state_oneshot);
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SEQ_printf(m, "\n");
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}
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if (dev->set_state_oneshot_stopped) {
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SEQ_printf(m, " oneshot stopped: ");
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print_name_offset(m, dev->set_state_oneshot_stopped);
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SEQ_printf(m, "\n");
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}
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if (dev->tick_resume) {
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SEQ_printf(m, " resume: ");
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print_name_offset(m, dev->tick_resume);
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SEQ_printf(m, "\n");
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}
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SEQ_printf(m, " event_handler: ");
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print_name_offset(m, 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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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: v0.8\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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