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Ingo Molnar289f4802007-02-16 01:28:15 -08001/*
2 * kernel/time/timer_list.c
3 *
4 * List pending timers
5 *
6 * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/proc_fs.h>
14#include <linux/module.h>
15#include <linux/spinlock.h>
16#include <linux/sched.h>
17#include <linux/seq_file.h>
18#include <linux/kallsyms.h>
19#include <linux/tick.h>
20
21#include <asm/uaccess.h>
22
Nathan Zimmerb3956a82013-03-26 19:56:30 -050023
24struct timer_list_iter {
25 int cpu;
26 bool second_pass;
27 u64 now;
28};
29
Ingo Molnar289f4802007-02-16 01:28:15 -080030typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
31
32DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
33
34/*
35 * This allows printing both to /proc/timer_list and
36 * to the console (on SysRq-Q):
37 */
38#define SEQ_printf(m, x...) \
39 do { \
40 if (m) \
41 seq_printf(m, x); \
42 else \
43 printk(x); \
44 } while (0)
45
46static void print_name_offset(struct seq_file *m, void *sym)
47{
Tejun Heo9281ace2007-07-17 04:03:51 -070048 char symname[KSYM_NAME_LEN];
Ingo Molnar289f4802007-02-16 01:28:15 -080049
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -070050 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
Kees Cookf5903082011-02-11 19:21:25 -080051 SEQ_printf(m, "<%pK>", sym);
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -070052 else
53 SEQ_printf(m, "%s", symname);
Ingo Molnar289f4802007-02-16 01:28:15 -080054}
55
56static void
Thomas Gleixnere67ef252008-09-25 23:50:23 +020057print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
58 int idx, u64 now)
Ingo Molnar289f4802007-02-16 01:28:15 -080059{
60#ifdef CONFIG_TIMER_STATS
61 char tmp[TASK_COMM_LEN + 1];
62#endif
63 SEQ_printf(m, " #%d: ", idx);
Thomas Gleixnere67ef252008-09-25 23:50:23 +020064 print_name_offset(m, taddr);
Ingo Molnar289f4802007-02-16 01:28:15 -080065 SEQ_printf(m, ", ");
66 print_name_offset(m, timer->function);
67 SEQ_printf(m, ", S:%02lx", timer->state);
68#ifdef CONFIG_TIMER_STATS
69 SEQ_printf(m, ", ");
70 print_name_offset(m, timer->start_site);
71 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
72 tmp[TASK_COMM_LEN] = 0;
73 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
74#endif
75 SEQ_printf(m, "\n");
Arjan van de Ven704af522008-09-07 16:10:20 -070076 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
77 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
Arjan van de Vencc584b22008-09-01 15:02:30 -070078 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
Arjan van de Ven704af522008-09-07 16:10:20 -070079 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
Arjan van de Vencc584b22008-09-01 15:02:30 -070080 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
Ingo Molnar289f4802007-02-16 01:28:15 -080081}
82
83static void
84print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
85 u64 now)
86{
87 struct hrtimer *timer, tmp;
88 unsigned long next = 0, i;
John Stultz998adc32010-09-20 19:19:17 -070089 struct timerqueue_node *curr;
Ingo Molnar289f4802007-02-16 01:28:15 -080090 unsigned long flags;
91
92next_one:
93 i = 0;
Thomas Gleixnerecb49d12009-11-17 16:36:54 +010094 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
Ingo Molnar289f4802007-02-16 01:28:15 -080095
John Stultz998adc32010-09-20 19:19:17 -070096 curr = timerqueue_getnext(&base->active);
Ingo Molnar289f4802007-02-16 01:28:15 -080097 /*
98 * Crude but we have to do this O(N*N) thing, because
99 * we have to unlock the base when printing:
100 */
101 while (curr && i < next) {
John Stultz998adc32010-09-20 19:19:17 -0700102 curr = timerqueue_iterate_next(curr);
Ingo Molnar289f4802007-02-16 01:28:15 -0800103 i++;
104 }
105
106 if (curr) {
107
John Stultz998adc32010-09-20 19:19:17 -0700108 timer = container_of(curr, struct hrtimer, node);
Ingo Molnar289f4802007-02-16 01:28:15 -0800109 tmp = *timer;
Thomas Gleixnerecb49d12009-11-17 16:36:54 +0100110 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
Ingo Molnar289f4802007-02-16 01:28:15 -0800111
Thomas Gleixnere67ef252008-09-25 23:50:23 +0200112 print_timer(m, timer, &tmp, i, now);
Ingo Molnar289f4802007-02-16 01:28:15 -0800113 next++;
114 goto next_one;
115 }
Thomas Gleixnerecb49d12009-11-17 16:36:54 +0100116 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
Ingo Molnar289f4802007-02-16 01:28:15 -0800117}
118
119static void
120print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
121{
Kees Cookf5903082011-02-11 19:21:25 -0800122 SEQ_printf(m, " .base: %pK\n", base);
Ingo Molnar289f4802007-02-16 01:28:15 -0800123 SEQ_printf(m, " .index: %d\n",
124 base->index);
David Miller9b04bd22007-05-09 02:33:43 -0700125 SEQ_printf(m, " .resolution: %Lu nsecs\n",
Ingo Molnar289f4802007-02-16 01:28:15 -0800126 (unsigned long long)ktime_to_ns(base->resolution));
127 SEQ_printf(m, " .get_time: ");
128 print_name_offset(m, base->get_time);
129 SEQ_printf(m, "\n");
130#ifdef CONFIG_HIGH_RES_TIMERS
David Miller9b04bd22007-05-09 02:33:43 -0700131 SEQ_printf(m, " .offset: %Lu nsecs\n",
132 (unsigned long long) ktime_to_ns(base->offset));
Ingo Molnar289f4802007-02-16 01:28:15 -0800133#endif
134 SEQ_printf(m, "active timers:\n");
135 print_active_timers(m, base, now);
136}
137
138static void print_cpu(struct seq_file *m, int cpu, u64 now)
139{
140 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
141 int i;
142
Vegard Nossum129f1d22007-10-11 08:23:34 +0200143 SEQ_printf(m, "cpu: %d\n", cpu);
Ingo Molnar289f4802007-02-16 01:28:15 -0800144 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
145 SEQ_printf(m, " clock %d:\n", i);
146 print_base(m, cpu_base->clock_base + i, now);
147 }
148#define P(x) \
David Miller9b04bd22007-05-09 02:33:43 -0700149 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
150 (unsigned long long)(cpu_base->x))
Ingo Molnar289f4802007-02-16 01:28:15 -0800151#define P_ns(x) \
David Miller9b04bd22007-05-09 02:33:43 -0700152 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
153 (unsigned long long)(ktime_to_ns(cpu_base->x)))
Ingo Molnar289f4802007-02-16 01:28:15 -0800154
155#ifdef CONFIG_HIGH_RES_TIMERS
156 P_ns(expires_next);
157 P(hres_active);
158 P(nr_events);
Thomas Gleixner41d2e492009-11-13 17:05:44 +0100159 P(nr_retries);
160 P(nr_hangs);
161 P_ns(max_hang_time);
Ingo Molnar289f4802007-02-16 01:28:15 -0800162#endif
163#undef P
164#undef P_ns
165
166#ifdef CONFIG_TICK_ONESHOT
167# define P(x) \
David Miller9b04bd22007-05-09 02:33:43 -0700168 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
169 (unsigned long long)(ts->x))
Ingo Molnar289f4802007-02-16 01:28:15 -0800170# define P_ns(x) \
David Miller9b04bd22007-05-09 02:33:43 -0700171 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
172 (unsigned long long)(ktime_to_ns(ts->x)))
Ingo Molnar289f4802007-02-16 01:28:15 -0800173 {
174 struct tick_sched *ts = tick_get_tick_sched(cpu);
175 P(nohz_mode);
Frederic Weisbeckerf5d411c2011-07-31 17:44:12 +0200176 P_ns(last_tick);
Ingo Molnar289f4802007-02-16 01:28:15 -0800177 P(tick_stopped);
178 P(idle_jiffies);
179 P(idle_calls);
180 P(idle_sleeps);
181 P_ns(idle_entrytime);
Thomas Gleixner5df7fa12008-02-01 17:45:14 +0100182 P_ns(idle_waketime);
183 P_ns(idle_exittime);
Ingo Molnar289f4802007-02-16 01:28:15 -0800184 P_ns(idle_sleeptime);
Arjan van de Ven0224cf42010-05-09 08:25:23 -0700185 P_ns(iowait_sleeptime);
Ingo Molnar289f4802007-02-16 01:28:15 -0800186 P(last_jiffies);
187 P(next_jiffies);
188 P_ns(idle_expires);
David Miller9b04bd22007-05-09 02:33:43 -0700189 SEQ_printf(m, "jiffies: %Lu\n",
190 (unsigned long long)jiffies);
Ingo Molnar289f4802007-02-16 01:28:15 -0800191 }
192#endif
193
194#undef P
195#undef P_ns
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500196 SEQ_printf(m, "\n");
Ingo Molnar289f4802007-02-16 01:28:15 -0800197}
198
199#ifdef CONFIG_GENERIC_CLOCKEVENTS
200static void
Thomas Gleixnerc5b77a32008-09-29 17:31:41 +0200201print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
Ingo Molnar289f4802007-02-16 01:28:15 -0800202{
203 struct clock_event_device *dev = td->evtdev;
204
Vegard Nossum129f1d22007-10-11 08:23:34 +0200205 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
Thomas Gleixnerc5b77a32008-09-29 17:31:41 +0200206 if (cpu < 0)
207 SEQ_printf(m, "Broadcast device\n");
208 else
209 SEQ_printf(m, "Per CPU device: %d\n", cpu);
Ingo Molnar289f4802007-02-16 01:28:15 -0800210
211 SEQ_printf(m, "Clock Event Device: ");
212 if (!dev) {
213 SEQ_printf(m, "<NULL>\n");
214 return;
215 }
216 SEQ_printf(m, "%s\n", dev->name);
Jon Hunter97813f22009-08-18 12:45:11 -0500217 SEQ_printf(m, " max_delta_ns: %llu\n",
218 (unsigned long long) dev->max_delta_ns);
219 SEQ_printf(m, " min_delta_ns: %llu\n",
220 (unsigned long long) dev->min_delta_ns);
Thomas Gleixner23af3682009-11-11 14:05:25 +0000221 SEQ_printf(m, " mult: %u\n", dev->mult);
222 SEQ_printf(m, " shift: %u\n", dev->shift);
Ingo Molnar289f4802007-02-16 01:28:15 -0800223 SEQ_printf(m, " mode: %d\n", dev->mode);
224 SEQ_printf(m, " next_event: %Ld nsecs\n",
225 (unsigned long long) ktime_to_ns(dev->next_event));
226
227 SEQ_printf(m, " set_next_event: ");
228 print_name_offset(m, dev->set_next_event);
229 SEQ_printf(m, "\n");
230
231 SEQ_printf(m, " set_mode: ");
232 print_name_offset(m, dev->set_mode);
233 SEQ_printf(m, "\n");
234
235 SEQ_printf(m, " event_handler: ");
236 print_name_offset(m, dev->event_handler);
237 SEQ_printf(m, "\n");
Thomas Gleixner80a05b92010-03-12 17:34:14 +0100238 SEQ_printf(m, " retries: %lu\n", dev->retries);
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500239 SEQ_printf(m, "\n");
Ingo Molnar289f4802007-02-16 01:28:15 -0800240}
241
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500242static void timer_list_show_tickdevices_header(struct seq_file *m)
Ingo Molnar289f4802007-02-16 01:28:15 -0800243{
Ingo Molnar289f4802007-02-16 01:28:15 -0800244#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
Thomas Gleixnerc5b77a32008-09-29 17:31:41 +0200245 print_tickdevice(m, tick_get_broadcast_device(), -1);
Ingo Molnar289f4802007-02-16 01:28:15 -0800246 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
Rusty Russell62ac1272009-12-17 11:43:26 -0600247 cpumask_bits(tick_get_broadcast_mask())[0]);
Ingo Molnar289f4802007-02-16 01:28:15 -0800248#ifdef CONFIG_TICK_ONESHOT
249 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
Rusty Russell62ac1272009-12-17 11:43:26 -0600250 cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
Ingo Molnar289f4802007-02-16 01:28:15 -0800251#endif
252 SEQ_printf(m, "\n");
253#endif
Ingo Molnar289f4802007-02-16 01:28:15 -0800254}
Ingo Molnar289f4802007-02-16 01:28:15 -0800255#endif
256
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500257static inline void timer_list_header(struct seq_file *m, u64 now)
Ingo Molnar289f4802007-02-16 01:28:15 -0800258{
Frederic Weisbeckerf5d411c2011-07-31 17:44:12 +0200259 SEQ_printf(m, "Timer List Version: v0.7\n");
Ingo Molnar289f4802007-02-16 01:28:15 -0800260 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
261 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500262 SEQ_printf(m, "\n");
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500263}
Ingo Molnar289f4802007-02-16 01:28:15 -0800264
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500265static int timer_list_show(struct seq_file *m, void *v)
266{
267 struct timer_list_iter *iter = v;
Ingo Molnar289f4802007-02-16 01:28:15 -0800268
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500269 if (iter->cpu == -1 && !iter->second_pass)
Nathan Zimmer84a78a62013-08-28 16:35:14 -0700270 timer_list_header(m, iter->now);
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500271 else if (!iter->second_pass)
272 print_cpu(m, iter->cpu, iter->now);
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500273#ifdef CONFIG_GENERIC_CLOCKEVENTS
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500274 else if (iter->cpu == -1 && iter->second_pass)
275 timer_list_show_tickdevices_header(m);
276 else
277 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
Nathan Zimmer60cf7ea2013-03-26 19:56:29 -0500278#endif
Ingo Molnar289f4802007-02-16 01:28:15 -0800279 return 0;
280}
281
282void sysrq_timer_list_show(void)
283{
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500284 u64 now = ktime_to_ns(ktime_get());
285 int cpu;
286
287 timer_list_header(NULL, now);
288
289 for_each_online_cpu(cpu)
290 print_cpu(NULL, cpu, now);
291
292#ifdef CONFIG_GENERIC_CLOCKEVENTS
293 timer_list_show_tickdevices_header(NULL);
294 for_each_online_cpu(cpu)
295 print_tickdevice(NULL, tick_get_device(cpu), cpu);
296#endif
297 return;
Ingo Molnar289f4802007-02-16 01:28:15 -0800298}
299
Nathan Zimmer84a78a62013-08-28 16:35:14 -0700300static void *move_iter(struct timer_list_iter *iter, loff_t offset)
301{
302 for (; offset; offset--) {
303 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
304 if (iter->cpu >= nr_cpu_ids) {
305#ifdef CONFIG_GENERIC_CLOCKEVENTS
306 if (!iter->second_pass) {
307 iter->cpu = -1;
308 iter->second_pass = true;
309 } else
310 return NULL;
311#else
312 return NULL;
313#endif
314 }
315 }
316 return iter;
317}
318
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500319static void *timer_list_start(struct seq_file *file, loff_t *offset)
320{
321 struct timer_list_iter *iter = file->private;
322
Nathan Zimmer84a78a62013-08-28 16:35:14 -0700323 if (!*offset)
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500324 iter->now = ktime_to_ns(ktime_get());
Nathan Zimmer84a78a62013-08-28 16:35:14 -0700325 iter->cpu = -1;
326 iter->second_pass = false;
327 return move_iter(iter, *offset);
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500328}
329
330static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
331{
332 struct timer_list_iter *iter = file->private;
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500333 ++*offset;
Nathan Zimmer84a78a62013-08-28 16:35:14 -0700334 return move_iter(iter, 1);
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500335}
336
337static void timer_list_stop(struct seq_file *seq, void *v)
338{
339}
340
341static const struct seq_operations timer_list_sops = {
342 .start = timer_list_start,
343 .next = timer_list_next,
344 .stop = timer_list_stop,
345 .show = timer_list_show,
346};
347
Ingo Molnar289f4802007-02-16 01:28:15 -0800348static int timer_list_open(struct inode *inode, struct file *filp)
349{
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500350 return seq_open_private(filp, &timer_list_sops,
351 sizeof(struct timer_list_iter));
Ingo Molnar289f4802007-02-16 01:28:15 -0800352}
353
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700354static const struct file_operations timer_list_fops = {
Ingo Molnar289f4802007-02-16 01:28:15 -0800355 .open = timer_list_open,
356 .read = seq_read,
357 .llseek = seq_lseek,
Nathan Zimmerb3956a82013-03-26 19:56:30 -0500358 .release = seq_release_private,
Ingo Molnar289f4802007-02-16 01:28:15 -0800359};
360
361static int __init init_timer_list_procfs(void)
362{
363 struct proc_dir_entry *pe;
364
Amerigo Wangde809342009-08-17 05:43:01 -0400365 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
Ingo Molnar289f4802007-02-16 01:28:15 -0800366 if (!pe)
367 return -ENOMEM;
Ingo Molnar289f4802007-02-16 01:28:15 -0800368 return 0;
369}
370__initcall(init_timer_list_procfs);