Commit | Line | Data |
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289f480a IM |
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> | |
01070427 | 19 | #include <linux/nmi.h> |
289f480a | 20 | |
7c0f6ba6 | 21 | #include <linux/uaccess.h> |
289f480a | 22 | |
c1797baf | 23 | #include "tick-internal.h" |
b3956a89 NZ |
24 | |
25 | struct timer_list_iter { | |
26 | int cpu; | |
27 | bool second_pass; | |
28 | u64 now; | |
29 | }; | |
30 | ||
289f480a IM |
31 | typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes); |
32 | ||
289f480a IM |
33 | /* |
34 | * This allows printing both to /proc/timer_list and | |
35 | * to the console (on SysRq-Q): | |
36 | */ | |
7de4e744 JP |
37 | __printf(2, 3) |
38 | static 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 | } | |
289f480a IM |
51 | |
52 | static void print_name_offset(struct seq_file *m, void *sym) | |
53 | { | |
9281acea | 54 | char symname[KSYM_NAME_LEN]; |
289f480a | 55 | |
9d65cb4a | 56 | if (lookup_symbol_name((unsigned long)sym, symname) < 0) |
f5903085 | 57 | SEQ_printf(m, "<%pK>", sym); |
9d65cb4a AD |
58 | else |
59 | SEQ_printf(m, "%s", symname); | |
289f480a IM |
60 | } |
61 | ||
62 | static void | |
e67ef25a TG |
63 | print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
64 | int idx, u64 now) | |
289f480a | 65 | { |
289f480a | 66 | SEQ_printf(m, " #%d: ", idx); |
e67ef25a | 67 | print_name_offset(m, taddr); |
289f480a IM |
68 | SEQ_printf(m, ", "); |
69 | print_name_offset(m, timer->function); | |
203cbf77 | 70 | SEQ_printf(m, ", S:%02x", timer->state); |
289f480a | 71 | SEQ_printf(m, "\n"); |
704af52b AV |
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)), | |
cc584b21 | 74 | (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
704af52b | 75 | (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
cc584b21 | 76 | (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
289f480a IM |
77 | } |
78 | ||
79 | static void | |
80 | print_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; | |
998adc3d | 85 | struct timerqueue_node *curr; |
289f480a IM |
86 | unsigned long flags; |
87 | ||
88 | next_one: | |
89 | i = 0; | |
01070427 TH |
90 | |
91 | touch_nmi_watchdog(); | |
92 | ||
ecb49d1a | 93 | raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
289f480a | 94 | |
998adc3d | 95 | curr = timerqueue_getnext(&base->active); |
289f480a IM |
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) { | |
998adc3d | 101 | curr = timerqueue_iterate_next(curr); |
289f480a IM |
102 | i++; |
103 | } | |
104 | ||
105 | if (curr) { | |
106 | ||
998adc3d | 107 | timer = container_of(curr, struct hrtimer, node); |
289f480a | 108 | tmp = *timer; |
ecb49d1a | 109 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a | 110 | |
e67ef25a | 111 | print_timer(m, timer, &tmp, i, now); |
289f480a IM |
112 | next++; |
113 | goto next_one; | |
114 | } | |
ecb49d1a | 115 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a IM |
116 | } |
117 | ||
118 | static void | |
119 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) | |
120 | { | |
f5903085 | 121 | SEQ_printf(m, " .base: %pK\n", base); |
398ca17f TG |
122 | SEQ_printf(m, " .index: %d\n", base->index); |
123 | ||
7551b02b | 124 | SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution); |
398ca17f | 125 | |
289f480a IM |
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 | |
9b04bd27 DM |
130 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
131 | (unsigned long long) ktime_to_ns(base->offset)); | |
289f480a IM |
132 | #endif |
133 | SEQ_printf(m, "active timers:\n"); | |
38bf985b | 134 | print_active_timers(m, base, now + ktime_to_ns(base->offset)); |
289f480a IM |
135 | } |
136 | ||
137 | static 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 | ||
129f1d2c | 142 | SEQ_printf(m, "cpu: %d\n", cpu); |
289f480a IM |
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) \ | |
9b04bd27 DM |
148 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
149 | (unsigned long long)(cpu_base->x)) | |
289f480a | 150 | #define P_ns(x) \ |
9b04bd27 DM |
151 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
152 | (unsigned long long)(ktime_to_ns(cpu_base->x))) | |
289f480a IM |
153 | |
154 | #ifdef CONFIG_HIGH_RES_TIMERS | |
155 | P_ns(expires_next); | |
156 | P(hres_active); | |
157 | P(nr_events); | |
41d2e494 TG |
158 | P(nr_retries); |
159 | P(nr_hangs); | |
a6ffebce | 160 | P(max_hang_time); |
289f480a IM |
161 | #endif |
162 | #undef P | |
163 | #undef P_ns | |
164 | ||
165 | #ifdef CONFIG_TICK_ONESHOT | |
166 | # define P(x) \ | |
9b04bd27 DM |
167 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
168 | (unsigned long long)(ts->x)) | |
289f480a | 169 | # define P_ns(x) \ |
9b04bd27 DM |
170 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
171 | (unsigned long long)(ktime_to_ns(ts->x))) | |
289f480a IM |
172 | { |
173 | struct tick_sched *ts = tick_get_tick_sched(cpu); | |
174 | P(nohz_mode); | |
f5d411c9 | 175 | P_ns(last_tick); |
289f480a IM |
176 | P(tick_stopped); |
177 | P(idle_jiffies); | |
178 | P(idle_calls); | |
179 | P(idle_sleeps); | |
180 | P_ns(idle_entrytime); | |
5df7fa1c TG |
181 | P_ns(idle_waketime); |
182 | P_ns(idle_exittime); | |
289f480a | 183 | P_ns(idle_sleeptime); |
0224cf4c | 184 | P_ns(iowait_sleeptime); |
289f480a | 185 | P(last_jiffies); |
c1ad348b | 186 | P(next_timer); |
289f480a | 187 | P_ns(idle_expires); |
9b04bd27 DM |
188 | SEQ_printf(m, "jiffies: %Lu\n", |
189 | (unsigned long long)jiffies); | |
289f480a IM |
190 | } |
191 | #endif | |
192 | ||
193 | #undef P | |
194 | #undef P_ns | |
60cf7ea8 | 195 | SEQ_printf(m, "\n"); |
289f480a IM |
196 | } |
197 | ||
198 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
199 | static void | |
c5b77a3d | 200 | print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
289f480a IM |
201 | { |
202 | struct clock_event_device *dev = td->evtdev; | |
203 | ||
01070427 TH |
204 | touch_nmi_watchdog(); |
205 | ||
129f1d2c | 206 | SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
c5b77a3d TG |
207 | if (cpu < 0) |
208 | SEQ_printf(m, "Broadcast device\n"); | |
209 | else | |
210 | SEQ_printf(m, "Per CPU device: %d\n", cpu); | |
289f480a IM |
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); | |
97813f2f JH |
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); | |
23af368e TG |
222 | SEQ_printf(m, " mult: %u\n", dev->mult); |
223 | SEQ_printf(m, " shift: %u\n", dev->shift); | |
eef7635a | 224 | SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev)); |
289f480a IM |
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 | ||
eef7635a VK |
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); | |
bd624d75 | 259 | SEQ_printf(m, "\n"); |
bd624d75 | 260 | } |
289f480a IM |
261 | |
262 | SEQ_printf(m, " event_handler: "); | |
263 | print_name_offset(m, dev->event_handler); | |
264 | SEQ_printf(m, "\n"); | |
80a05b9f | 265 | SEQ_printf(m, " retries: %lu\n", dev->retries); |
60cf7ea8 | 266 | SEQ_printf(m, "\n"); |
289f480a IM |
267 | } |
268 | ||
60cf7ea8 | 269 | static void timer_list_show_tickdevices_header(struct seq_file *m) |
289f480a | 270 | { |
289f480a | 271 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
c5b77a3d | 272 | print_tickdevice(m, tick_get_broadcast_device(), -1); |
1ef09cd7 PM |
273 | SEQ_printf(m, "tick_broadcast_mask: %*pb\n", |
274 | cpumask_pr_args(tick_get_broadcast_mask())); | |
289f480a | 275 | #ifdef CONFIG_TICK_ONESHOT |
1ef09cd7 PM |
276 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n", |
277 | cpumask_pr_args(tick_get_broadcast_oneshot_mask())); | |
289f480a IM |
278 | #endif |
279 | SEQ_printf(m, "\n"); | |
280 | #endif | |
289f480a | 281 | } |
289f480a IM |
282 | #endif |
283 | ||
b3956a89 | 284 | static inline void timer_list_header(struct seq_file *m, u64 now) |
289f480a | 285 | { |
c1ad348b | 286 | SEQ_printf(m, "Timer List Version: v0.8\n"); |
289f480a IM |
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); | |
60cf7ea8 | 289 | SEQ_printf(m, "\n"); |
b3956a89 NZ |
290 | } |
291 | ||
292 | static int timer_list_show(struct seq_file *m, void *v) | |
293 | { | |
294 | struct timer_list_iter *iter = v; | |
b3956a89 NZ |
295 | |
296 | if (iter->cpu == -1 && !iter->second_pass) | |
84a78a65 | 297 | timer_list_header(m, iter->now); |
b3956a89 NZ |
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 | ||
309 | void sysrq_timer_list_show(void) | |
310 | { | |
311 | u64 now = ktime_to_ns(ktime_get()); | |
312 | int cpu; | |
313 | ||
314 | timer_list_header(NULL, now); | |
289f480a IM |
315 | |
316 | for_each_online_cpu(cpu) | |
b3956a89 | 317 | print_cpu(NULL, cpu, now); |
289f480a | 318 | |
60cf7ea8 | 319 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
b3956a89 | 320 | timer_list_show_tickdevices_header(NULL); |
60cf7ea8 | 321 | for_each_online_cpu(cpu) |
b3956a89 | 322 | print_tickdevice(NULL, tick_get_device(cpu), cpu); |
60cf7ea8 | 323 | #endif |
b3956a89 NZ |
324 | return; |
325 | } | |
289f480a | 326 | |
84a78a65 | 327 | static void *move_iter(struct timer_list_iter *iter, loff_t offset) |
b3956a89 | 328 | { |
84a78a65 NZ |
329 | for (; offset; offset--) { |
330 | iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); | |
331 | if (iter->cpu >= nr_cpu_ids) { | |
b3956a89 | 332 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
84a78a65 NZ |
333 | if (!iter->second_pass) { |
334 | iter->cpu = -1; | |
335 | iter->second_pass = true; | |
336 | } else | |
337 | return NULL; | |
b3956a89 | 338 | #else |
84a78a65 | 339 | return NULL; |
b3956a89 | 340 | #endif |
84a78a65 | 341 | } |
b3956a89 NZ |
342 | } |
343 | return iter; | |
289f480a IM |
344 | } |
345 | ||
84a78a65 NZ |
346 | static 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 | ||
b3956a89 | 357 | static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) |
289f480a | 358 | { |
b3956a89 | 359 | struct timer_list_iter *iter = file->private; |
b3956a89 | 360 | ++*offset; |
84a78a65 | 361 | return move_iter(iter, 1); |
289f480a IM |
362 | } |
363 | ||
b3956a89 NZ |
364 | static void timer_list_stop(struct seq_file *seq, void *v) |
365 | { | |
366 | } | |
367 | ||
368 | static 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 | ||
289f480a IM |
375 | static int timer_list_open(struct inode *inode, struct file *filp) |
376 | { | |
b3956a89 NZ |
377 | return seq_open_private(filp, &timer_list_sops, |
378 | sizeof(struct timer_list_iter)); | |
289f480a IM |
379 | } |
380 | ||
828c0950 | 381 | static const struct file_operations timer_list_fops = { |
289f480a IM |
382 | .open = timer_list_open, |
383 | .read = seq_read, | |
384 | .llseek = seq_lseek, | |
b3956a89 | 385 | .release = seq_release_private, |
289f480a IM |
386 | }; |
387 | ||
388 | static int __init init_timer_list_procfs(void) | |
389 | { | |
390 | struct proc_dir_entry *pe; | |
391 | ||
8e7df2b5 | 392 | pe = proc_create("timer_list", 0400, NULL, &timer_list_fops); |
289f480a IM |
393 | if (!pe) |
394 | return -ENOMEM; | |
289f480a IM |
395 | return 0; |
396 | } | |
397 | __initcall(init_timer_list_procfs); |