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1/*
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/nmi.h>
20
21#include <linux/uaccess.h>
22
23#include "tick-internal.h"
24
25struct timer_list_iter {
26 int cpu;
27 bool second_pass;
28 u64 now;
29};
30
31typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
32
33/*
34 * This allows printing both to /proc/timer_list and
35 * to the console (on SysRq-Q):
36 */
37__printf(2, 3)
38static void SEQ_printf(struct seq_file *m, const char *fmt, ...)
39{
40 va_list args;
41
42 va_start(args, fmt);
43
44 if (m)
45 seq_vprintf(m, fmt, args);
46 else
47 vprintk(fmt, args);
48
49 va_end(args);
50}
51
52static void print_name_offset(struct seq_file *m, void *sym)
53{
54 char symname[KSYM_NAME_LEN];
55
56 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
57 SEQ_printf(m, "<%pK>", sym);
58 else
59 SEQ_printf(m, "%s", symname);
60}
61
62static void
63print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
64 int idx, u64 now)
65{
66 SEQ_printf(m, " #%d: ", idx);
67 print_name_offset(m, taddr);
68 SEQ_printf(m, ", ");
69 print_name_offset(m, timer->function);
70 SEQ_printf(m, ", S:%02x", timer->state);
71 SEQ_printf(m, "\n");
72 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
73 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
74 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
75 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
76 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
77}
78
79static void
80print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
81 u64 now)
82{
83 struct hrtimer *timer, tmp;
84 unsigned long next = 0, i;
85 struct timerqueue_node *curr;
86 unsigned long flags;
87
88next_one:
89 i = 0;
90
91 touch_nmi_watchdog();
92
93 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
94
95 curr = timerqueue_getnext(&base->active);
96 /*
97 * Crude but we have to do this O(N*N) thing, because
98 * we have to unlock the base when printing:
99 */
100 while (curr && i < next) {
101 curr = timerqueue_iterate_next(curr);
102 i++;
103 }
104
105 if (curr) {
106
107 timer = container_of(curr, struct hrtimer, node);
108 tmp = *timer;
109 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
110
111 print_timer(m, timer, &tmp, i, now);
112 next++;
113 goto next_one;
114 }
115 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
116}
117
118static void
119print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
120{
121 SEQ_printf(m, " .base: %pK\n", base);
122 SEQ_printf(m, " .index: %d\n", base->index);
123
124 SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution);
125
126 SEQ_printf(m, " .get_time: ");
127 print_name_offset(m, base->get_time);
128 SEQ_printf(m, "\n");
129#ifdef CONFIG_HIGH_RES_TIMERS
130 SEQ_printf(m, " .offset: %Lu nsecs\n",
131 (unsigned long long) ktime_to_ns(base->offset));
132#endif
133 SEQ_printf(m, "active timers:\n");
134 print_active_timers(m, base, now + ktime_to_ns(base->offset));
135}
136
137static void print_cpu(struct seq_file *m, int cpu, u64 now)
138{
139 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
140 int i;
141
142 SEQ_printf(m, "cpu: %d\n", cpu);
143 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
144 SEQ_printf(m, " clock %d:\n", i);
145 print_base(m, cpu_base->clock_base + i, now);
146 }
147#define P(x) \
148 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
149 (unsigned long long)(cpu_base->x))
150#define P_ns(x) \
151 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
152 (unsigned long long)(ktime_to_ns(cpu_base->x)))
153
154#ifdef CONFIG_HIGH_RES_TIMERS
155 P_ns(expires_next);
156 P(hres_active);
157 P(nr_events);
158 P(nr_retries);
159 P(nr_hangs);
160 P(max_hang_time);
161#endif
162#undef P
163#undef P_ns
164
165#ifdef CONFIG_TICK_ONESHOT
166# define P(x) \
167 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
168 (unsigned long long)(ts->x))
169# define P_ns(x) \
170 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
171 (unsigned long long)(ktime_to_ns(ts->x)))
172 {
173 struct tick_sched *ts = tick_get_tick_sched(cpu);
174 P(nohz_mode);
175 P_ns(last_tick);
176 P(tick_stopped);
177 P(idle_jiffies);
178 P(idle_calls);
179 P(idle_sleeps);
180 P_ns(idle_entrytime);
181 P_ns(idle_waketime);
182 P_ns(idle_exittime);
183 P_ns(idle_sleeptime);
184 P_ns(iowait_sleeptime);
185 P(last_jiffies);
186 P(next_timer);
187 P_ns(idle_expires);
188 SEQ_printf(m, "jiffies: %Lu\n",
189 (unsigned long long)jiffies);
190 }
191#endif
192
193#undef P
194#undef P_ns
195 SEQ_printf(m, "\n");
196}
197
198#ifdef CONFIG_GENERIC_CLOCKEVENTS
199static void
200print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
201{
202 struct clock_event_device *dev = td->evtdev;
203
204 touch_nmi_watchdog();
205
206 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
207 if (cpu < 0)
208 SEQ_printf(m, "Broadcast device\n");
209 else
210 SEQ_printf(m, "Per CPU device: %d\n", cpu);
211
212 SEQ_printf(m, "Clock Event Device: ");
213 if (!dev) {
214 SEQ_printf(m, "<NULL>\n");
215 return;
216 }
217 SEQ_printf(m, "%s\n", dev->name);
218 SEQ_printf(m, " max_delta_ns: %llu\n",
219 (unsigned long long) dev->max_delta_ns);
220 SEQ_printf(m, " min_delta_ns: %llu\n",
221 (unsigned long long) dev->min_delta_ns);
222 SEQ_printf(m, " mult: %u\n", dev->mult);
223 SEQ_printf(m, " shift: %u\n", dev->shift);
224 SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
225 SEQ_printf(m, " next_event: %Ld nsecs\n",
226 (unsigned long long) ktime_to_ns(dev->next_event));
227
228 SEQ_printf(m, " set_next_event: ");
229 print_name_offset(m, dev->set_next_event);
230 SEQ_printf(m, "\n");
231
232 if (dev->set_state_shutdown) {
233 SEQ_printf(m, " shutdown: ");
234 print_name_offset(m, dev->set_state_shutdown);
235 SEQ_printf(m, "\n");
236 }
237
238 if (dev->set_state_periodic) {
239 SEQ_printf(m, " periodic: ");
240 print_name_offset(m, dev->set_state_periodic);
241 SEQ_printf(m, "\n");
242 }
243
244 if (dev->set_state_oneshot) {
245 SEQ_printf(m, " oneshot: ");
246 print_name_offset(m, dev->set_state_oneshot);
247 SEQ_printf(m, "\n");
248 }
249
250 if (dev->set_state_oneshot_stopped) {
251 SEQ_printf(m, " oneshot stopped: ");
252 print_name_offset(m, dev->set_state_oneshot_stopped);
253 SEQ_printf(m, "\n");
254 }
255
256 if (dev->tick_resume) {
257 SEQ_printf(m, " resume: ");
258 print_name_offset(m, dev->tick_resume);
259 SEQ_printf(m, "\n");
260 }
261
262 SEQ_printf(m, " event_handler: ");
263 print_name_offset(m, dev->event_handler);
264 SEQ_printf(m, "\n");
265 SEQ_printf(m, " retries: %lu\n", dev->retries);
266 SEQ_printf(m, "\n");
267}
268
269static void timer_list_show_tickdevices_header(struct seq_file *m)
270{
271#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
272 print_tickdevice(m, tick_get_broadcast_device(), -1);
273 SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
274 cpumask_pr_args(tick_get_broadcast_mask()));
275#ifdef CONFIG_TICK_ONESHOT
276 SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
277 cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
278#endif
279 SEQ_printf(m, "\n");
280#endif
281}
282#endif
283
284static inline void timer_list_header(struct seq_file *m, u64 now)
285{
286 SEQ_printf(m, "Timer List Version: v0.8\n");
287 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
288 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
289 SEQ_printf(m, "\n");
290}
291
292static int timer_list_show(struct seq_file *m, void *v)
293{
294 struct timer_list_iter *iter = v;
295
296 if (iter->cpu == -1 && !iter->second_pass)
297 timer_list_header(m, iter->now);
298 else if (!iter->second_pass)
299 print_cpu(m, iter->cpu, iter->now);
300#ifdef CONFIG_GENERIC_CLOCKEVENTS
301 else if (iter->cpu == -1 && iter->second_pass)
302 timer_list_show_tickdevices_header(m);
303 else
304 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
305#endif
306 return 0;
307}
308
309void sysrq_timer_list_show(void)
310{
311 u64 now = ktime_to_ns(ktime_get());
312 int cpu;
313
314 timer_list_header(NULL, now);
315
316 for_each_online_cpu(cpu)
317 print_cpu(NULL, cpu, now);
318
319#ifdef CONFIG_GENERIC_CLOCKEVENTS
320 timer_list_show_tickdevices_header(NULL);
321 for_each_online_cpu(cpu)
322 print_tickdevice(NULL, tick_get_device(cpu), cpu);
323#endif
324 return;
325}
326
327static void *move_iter(struct timer_list_iter *iter, loff_t offset)
328{
329 for (; offset; offset--) {
330 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
331 if (iter->cpu >= nr_cpu_ids) {
332#ifdef CONFIG_GENERIC_CLOCKEVENTS
333 if (!iter->second_pass) {
334 iter->cpu = -1;
335 iter->second_pass = true;
336 } else
337 return NULL;
338#else
339 return NULL;
340#endif
341 }
342 }
343 return iter;
344}
345
346static void *timer_list_start(struct seq_file *file, loff_t *offset)
347{
348 struct timer_list_iter *iter = file->private;
349
350 if (!*offset)
351 iter->now = ktime_to_ns(ktime_get());
352 iter->cpu = -1;
353 iter->second_pass = false;
354 return move_iter(iter, *offset);
355}
356
357static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
358{
359 struct timer_list_iter *iter = file->private;
360 ++*offset;
361 return move_iter(iter, 1);
362}
363
364static void timer_list_stop(struct seq_file *seq, void *v)
365{
366}
367
368static const struct seq_operations timer_list_sops = {
369 .start = timer_list_start,
370 .next = timer_list_next,
371 .stop = timer_list_stop,
372 .show = timer_list_show,
373};
374
375static int timer_list_open(struct inode *inode, struct file *filp)
376{
377 return seq_open_private(filp, &timer_list_sops,
378 sizeof(struct timer_list_iter));
379}
380
381static const struct file_operations timer_list_fops = {
382 .open = timer_list_open,
383 .read = seq_read,
384 .llseek = seq_lseek,
385 .release = seq_release_private,
386};
387
388static int __init init_timer_list_procfs(void)
389{
390 struct proc_dir_entry *pe;
391
392 pe = proc_create("timer_list", 0400, NULL, &timer_list_fops);
393 if (!pe)
394 return -ENOMEM;
395 return 0;
396}
397__initcall(init_timer_list_procfs);
1/*
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
23typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
24
25DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
26
27/*
28 * This allows printing both to /proc/timer_list and
29 * to the console (on SysRq-Q):
30 */
31#define SEQ_printf(m, x...) \
32 do { \
33 if (m) \
34 seq_printf(m, x); \
35 else \
36 printk(x); \
37 } while (0)
38
39static void print_name_offset(struct seq_file *m, void *sym)
40{
41 char symname[KSYM_NAME_LEN];
42
43 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
44 SEQ_printf(m, "<%pK>", sym);
45 else
46 SEQ_printf(m, "%s", symname);
47}
48
49static void
50print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
51 int idx, u64 now)
52{
53#ifdef CONFIG_TIMER_STATS
54 char tmp[TASK_COMM_LEN + 1];
55#endif
56 SEQ_printf(m, " #%d: ", idx);
57 print_name_offset(m, taddr);
58 SEQ_printf(m, ", ");
59 print_name_offset(m, timer->function);
60 SEQ_printf(m, ", S:%02lx", timer->state);
61#ifdef CONFIG_TIMER_STATS
62 SEQ_printf(m, ", ");
63 print_name_offset(m, timer->start_site);
64 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
65 tmp[TASK_COMM_LEN] = 0;
66 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
67#endif
68 SEQ_printf(m, "\n");
69 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
70 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
71 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
72 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
73 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
74}
75
76static void
77print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
78 u64 now)
79{
80 struct hrtimer *timer, tmp;
81 unsigned long next = 0, i;
82 struct timerqueue_node *curr;
83 unsigned long flags;
84
85next_one:
86 i = 0;
87 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
88
89 curr = timerqueue_getnext(&base->active);
90 /*
91 * Crude but we have to do this O(N*N) thing, because
92 * we have to unlock the base when printing:
93 */
94 while (curr && i < next) {
95 curr = timerqueue_iterate_next(curr);
96 i++;
97 }
98
99 if (curr) {
100
101 timer = container_of(curr, struct hrtimer, node);
102 tmp = *timer;
103 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
104
105 print_timer(m, timer, &tmp, i, now);
106 next++;
107 goto next_one;
108 }
109 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
110}
111
112static void
113print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
114{
115 SEQ_printf(m, " .base: %pK\n", base);
116 SEQ_printf(m, " .index: %d\n",
117 base->index);
118 SEQ_printf(m, " .resolution: %Lu nsecs\n",
119 (unsigned long long)ktime_to_ns(base->resolution));
120 SEQ_printf(m, " .get_time: ");
121 print_name_offset(m, base->get_time);
122 SEQ_printf(m, "\n");
123#ifdef CONFIG_HIGH_RES_TIMERS
124 SEQ_printf(m, " .offset: %Lu nsecs\n",
125 (unsigned long long) ktime_to_ns(base->offset));
126#endif
127 SEQ_printf(m, "active timers:\n");
128 print_active_timers(m, base, now);
129}
130
131static void print_cpu(struct seq_file *m, int cpu, u64 now)
132{
133 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
134 int i;
135
136 SEQ_printf(m, "\n");
137 SEQ_printf(m, "cpu: %d\n", cpu);
138 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
139 SEQ_printf(m, " clock %d:\n", i);
140 print_base(m, cpu_base->clock_base + i, now);
141 }
142#define P(x) \
143 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
144 (unsigned long long)(cpu_base->x))
145#define P_ns(x) \
146 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
147 (unsigned long long)(ktime_to_ns(cpu_base->x)))
148
149#ifdef CONFIG_HIGH_RES_TIMERS
150 P_ns(expires_next);
151 P(hres_active);
152 P(nr_events);
153 P(nr_retries);
154 P(nr_hangs);
155 P_ns(max_hang_time);
156#endif
157#undef P
158#undef P_ns
159
160#ifdef CONFIG_TICK_ONESHOT
161# define P(x) \
162 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
163 (unsigned long long)(ts->x))
164# define P_ns(x) \
165 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
166 (unsigned long long)(ktime_to_ns(ts->x)))
167 {
168 struct tick_sched *ts = tick_get_tick_sched(cpu);
169 P(nohz_mode);
170 P_ns(idle_tick);
171 P(tick_stopped);
172 P(idle_jiffies);
173 P(idle_calls);
174 P(idle_sleeps);
175 P_ns(idle_entrytime);
176 P_ns(idle_waketime);
177 P_ns(idle_exittime);
178 P_ns(idle_sleeptime);
179 P_ns(iowait_sleeptime);
180 P(last_jiffies);
181 P(next_jiffies);
182 P_ns(idle_expires);
183 SEQ_printf(m, "jiffies: %Lu\n",
184 (unsigned long long)jiffies);
185 }
186#endif
187
188#undef P
189#undef P_ns
190}
191
192#ifdef CONFIG_GENERIC_CLOCKEVENTS
193static void
194print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
195{
196 struct clock_event_device *dev = td->evtdev;
197
198 SEQ_printf(m, "\n");
199 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
200 if (cpu < 0)
201 SEQ_printf(m, "Broadcast device\n");
202 else
203 SEQ_printf(m, "Per CPU device: %d\n", cpu);
204
205 SEQ_printf(m, "Clock Event Device: ");
206 if (!dev) {
207 SEQ_printf(m, "<NULL>\n");
208 return;
209 }
210 SEQ_printf(m, "%s\n", dev->name);
211 SEQ_printf(m, " max_delta_ns: %llu\n",
212 (unsigned long long) dev->max_delta_ns);
213 SEQ_printf(m, " min_delta_ns: %llu\n",
214 (unsigned long long) dev->min_delta_ns);
215 SEQ_printf(m, " mult: %u\n", dev->mult);
216 SEQ_printf(m, " shift: %u\n", dev->shift);
217 SEQ_printf(m, " mode: %d\n", dev->mode);
218 SEQ_printf(m, " next_event: %Ld nsecs\n",
219 (unsigned long long) ktime_to_ns(dev->next_event));
220
221 SEQ_printf(m, " set_next_event: ");
222 print_name_offset(m, dev->set_next_event);
223 SEQ_printf(m, "\n");
224
225 SEQ_printf(m, " set_mode: ");
226 print_name_offset(m, dev->set_mode);
227 SEQ_printf(m, "\n");
228
229 SEQ_printf(m, " event_handler: ");
230 print_name_offset(m, dev->event_handler);
231 SEQ_printf(m, "\n");
232 SEQ_printf(m, " retries: %lu\n", dev->retries);
233}
234
235static void timer_list_show_tickdevices(struct seq_file *m)
236{
237 int cpu;
238
239#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
240 print_tickdevice(m, tick_get_broadcast_device(), -1);
241 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
242 cpumask_bits(tick_get_broadcast_mask())[0]);
243#ifdef CONFIG_TICK_ONESHOT
244 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
245 cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
246#endif
247 SEQ_printf(m, "\n");
248#endif
249 for_each_online_cpu(cpu)
250 print_tickdevice(m, tick_get_device(cpu), cpu);
251 SEQ_printf(m, "\n");
252}
253#else
254static void timer_list_show_tickdevices(struct seq_file *m) { }
255#endif
256
257static int timer_list_show(struct seq_file *m, void *v)
258{
259 u64 now = ktime_to_ns(ktime_get());
260 int cpu;
261
262 SEQ_printf(m, "Timer List Version: v0.6\n");
263 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
264 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
265
266 for_each_online_cpu(cpu)
267 print_cpu(m, cpu, now);
268
269 SEQ_printf(m, "\n");
270 timer_list_show_tickdevices(m);
271
272 return 0;
273}
274
275void sysrq_timer_list_show(void)
276{
277 timer_list_show(NULL, NULL);
278}
279
280static int timer_list_open(struct inode *inode, struct file *filp)
281{
282 return single_open(filp, timer_list_show, NULL);
283}
284
285static const struct file_operations timer_list_fops = {
286 .open = timer_list_open,
287 .read = seq_read,
288 .llseek = seq_lseek,
289 .release = single_release,
290};
291
292static int __init init_timer_list_procfs(void)
293{
294 struct proc_dir_entry *pe;
295
296 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
297 if (!pe)
298 return -ENOMEM;
299 return 0;
300}
301__initcall(init_timer_list_procfs);