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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> | |
289f480a IM |
19 | |
20 | #include <asm/uaccess.h> | |
21 | ||
c1797baf | 22 | #include "tick-internal.h" |
b3956a89 NZ |
23 | |
24 | struct timer_list_iter { | |
25 | int cpu; | |
26 | bool second_pass; | |
27 | u64 now; | |
28 | }; | |
29 | ||
289f480a IM |
30 | typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes); |
31 | ||
289f480a IM |
32 | /* |
33 | * This allows printing both to /proc/timer_list and | |
34 | * to the console (on SysRq-Q): | |
35 | */ | |
7de4e744 JP |
36 | __printf(2, 3) |
37 | static void SEQ_printf(struct seq_file *m, const char *fmt, ...) | |
38 | { | |
39 | va_list args; | |
40 | ||
41 | va_start(args, fmt); | |
42 | ||
43 | if (m) | |
44 | seq_vprintf(m, fmt, args); | |
45 | else | |
46 | vprintk(fmt, args); | |
47 | ||
48 | va_end(args); | |
49 | } | |
289f480a IM |
50 | |
51 | static void print_name_offset(struct seq_file *m, void *sym) | |
52 | { | |
9281acea | 53 | char symname[KSYM_NAME_LEN]; |
289f480a | 54 | |
9d65cb4a | 55 | if (lookup_symbol_name((unsigned long)sym, symname) < 0) |
f5903085 | 56 | SEQ_printf(m, "<%pK>", sym); |
9d65cb4a AD |
57 | else |
58 | SEQ_printf(m, "%s", symname); | |
289f480a IM |
59 | } |
60 | ||
61 | static void | |
e67ef25a TG |
62 | print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
63 | int idx, u64 now) | |
289f480a IM |
64 | { |
65 | #ifdef CONFIG_TIMER_STATS | |
66 | char tmp[TASK_COMM_LEN + 1]; | |
67 | #endif | |
68 | SEQ_printf(m, " #%d: ", idx); | |
e67ef25a | 69 | print_name_offset(m, taddr); |
289f480a IM |
70 | SEQ_printf(m, ", "); |
71 | print_name_offset(m, timer->function); | |
72 | SEQ_printf(m, ", S:%02lx", timer->state); | |
73 | #ifdef CONFIG_TIMER_STATS | |
74 | SEQ_printf(m, ", "); | |
75 | print_name_offset(m, timer->start_site); | |
76 | memcpy(tmp, timer->start_comm, TASK_COMM_LEN); | |
77 | tmp[TASK_COMM_LEN] = 0; | |
78 | SEQ_printf(m, ", %s/%d", tmp, timer->start_pid); | |
79 | #endif | |
80 | SEQ_printf(m, "\n"); | |
704af52b AV |
81 | SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", |
82 | (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)), | |
cc584b21 | 83 | (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
704af52b | 84 | (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
cc584b21 | 85 | (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
289f480a IM |
86 | } |
87 | ||
88 | static void | |
89 | print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, | |
90 | u64 now) | |
91 | { | |
92 | struct hrtimer *timer, tmp; | |
93 | unsigned long next = 0, i; | |
998adc3d | 94 | struct timerqueue_node *curr; |
289f480a IM |
95 | unsigned long flags; |
96 | ||
97 | next_one: | |
98 | i = 0; | |
ecb49d1a | 99 | raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
289f480a | 100 | |
998adc3d | 101 | curr = timerqueue_getnext(&base->active); |
289f480a IM |
102 | /* |
103 | * Crude but we have to do this O(N*N) thing, because | |
104 | * we have to unlock the base when printing: | |
105 | */ | |
106 | while (curr && i < next) { | |
998adc3d | 107 | curr = timerqueue_iterate_next(curr); |
289f480a IM |
108 | i++; |
109 | } | |
110 | ||
111 | if (curr) { | |
112 | ||
998adc3d | 113 | timer = container_of(curr, struct hrtimer, node); |
289f480a | 114 | tmp = *timer; |
ecb49d1a | 115 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a | 116 | |
e67ef25a | 117 | print_timer(m, timer, &tmp, i, now); |
289f480a IM |
118 | next++; |
119 | goto next_one; | |
120 | } | |
ecb49d1a | 121 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a IM |
122 | } |
123 | ||
124 | static void | |
125 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) | |
126 | { | |
f5903085 | 127 | SEQ_printf(m, " .base: %pK\n", base); |
398ca17f TG |
128 | SEQ_printf(m, " .index: %d\n", base->index); |
129 | ||
130 | SEQ_printf(m, " .resolution: %u nsecs\n", (unsigned) hrtimer_resolution); | |
131 | ||
289f480a IM |
132 | SEQ_printf(m, " .get_time: "); |
133 | print_name_offset(m, base->get_time); | |
134 | SEQ_printf(m, "\n"); | |
135 | #ifdef CONFIG_HIGH_RES_TIMERS | |
9b04bd27 DM |
136 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
137 | (unsigned long long) ktime_to_ns(base->offset)); | |
289f480a IM |
138 | #endif |
139 | SEQ_printf(m, "active timers:\n"); | |
140 | print_active_timers(m, base, now); | |
141 | } | |
142 | ||
143 | static void print_cpu(struct seq_file *m, int cpu, u64 now) | |
144 | { | |
145 | struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); | |
146 | int i; | |
147 | ||
129f1d2c | 148 | SEQ_printf(m, "cpu: %d\n", cpu); |
289f480a IM |
149 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
150 | SEQ_printf(m, " clock %d:\n", i); | |
151 | print_base(m, cpu_base->clock_base + i, now); | |
152 | } | |
153 | #define P(x) \ | |
9b04bd27 DM |
154 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
155 | (unsigned long long)(cpu_base->x)) | |
289f480a | 156 | #define P_ns(x) \ |
9b04bd27 DM |
157 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
158 | (unsigned long long)(ktime_to_ns(cpu_base->x))) | |
289f480a IM |
159 | |
160 | #ifdef CONFIG_HIGH_RES_TIMERS | |
161 | P_ns(expires_next); | |
162 | P(hres_active); | |
163 | P(nr_events); | |
41d2e494 TG |
164 | P(nr_retries); |
165 | P(nr_hangs); | |
a6ffebce | 166 | P(max_hang_time); |
289f480a IM |
167 | #endif |
168 | #undef P | |
169 | #undef P_ns | |
170 | ||
171 | #ifdef CONFIG_TICK_ONESHOT | |
172 | # define P(x) \ | |
9b04bd27 DM |
173 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
174 | (unsigned long long)(ts->x)) | |
289f480a | 175 | # define P_ns(x) \ |
9b04bd27 DM |
176 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
177 | (unsigned long long)(ktime_to_ns(ts->x))) | |
289f480a IM |
178 | { |
179 | struct tick_sched *ts = tick_get_tick_sched(cpu); | |
180 | P(nohz_mode); | |
f5d411c9 | 181 | P_ns(last_tick); |
289f480a IM |
182 | P(tick_stopped); |
183 | P(idle_jiffies); | |
184 | P(idle_calls); | |
185 | P(idle_sleeps); | |
186 | P_ns(idle_entrytime); | |
5df7fa1c TG |
187 | P_ns(idle_waketime); |
188 | P_ns(idle_exittime); | |
289f480a | 189 | P_ns(idle_sleeptime); |
0224cf4c | 190 | P_ns(iowait_sleeptime); |
289f480a | 191 | P(last_jiffies); |
c1ad348b | 192 | P(next_timer); |
289f480a | 193 | P_ns(idle_expires); |
9b04bd27 DM |
194 | SEQ_printf(m, "jiffies: %Lu\n", |
195 | (unsigned long long)jiffies); | |
289f480a IM |
196 | } |
197 | #endif | |
198 | ||
199 | #undef P | |
200 | #undef P_ns | |
60cf7ea8 | 201 | SEQ_printf(m, "\n"); |
289f480a IM |
202 | } |
203 | ||
204 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
205 | static void | |
c5b77a3d | 206 | print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
289f480a IM |
207 | { |
208 | struct clock_event_device *dev = td->evtdev; | |
209 | ||
129f1d2c | 210 | SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
c5b77a3d TG |
211 | if (cpu < 0) |
212 | SEQ_printf(m, "Broadcast device\n"); | |
213 | else | |
214 | SEQ_printf(m, "Per CPU device: %d\n", cpu); | |
289f480a IM |
215 | |
216 | SEQ_printf(m, "Clock Event Device: "); | |
217 | if (!dev) { | |
218 | SEQ_printf(m, "<NULL>\n"); | |
219 | return; | |
220 | } | |
221 | SEQ_printf(m, "%s\n", dev->name); | |
97813f2f JH |
222 | SEQ_printf(m, " max_delta_ns: %llu\n", |
223 | (unsigned long long) dev->max_delta_ns); | |
224 | SEQ_printf(m, " min_delta_ns: %llu\n", | |
225 | (unsigned long long) dev->min_delta_ns); | |
23af368e TG |
226 | SEQ_printf(m, " mult: %u\n", dev->mult); |
227 | SEQ_printf(m, " shift: %u\n", dev->shift); | |
289f480a IM |
228 | SEQ_printf(m, " mode: %d\n", dev->mode); |
229 | SEQ_printf(m, " next_event: %Ld nsecs\n", | |
230 | (unsigned long long) ktime_to_ns(dev->next_event)); | |
231 | ||
232 | SEQ_printf(m, " set_next_event: "); | |
233 | print_name_offset(m, dev->set_next_event); | |
234 | SEQ_printf(m, "\n"); | |
235 | ||
bd624d75 VK |
236 | if (dev->set_mode) { |
237 | SEQ_printf(m, " set_mode: "); | |
238 | print_name_offset(m, dev->set_mode); | |
239 | SEQ_printf(m, "\n"); | |
240 | } else { | |
77e32c89 | 241 | if (dev->set_state_shutdown) { |
bd624d75 | 242 | SEQ_printf(m, " shutdown: "); |
77e32c89 | 243 | print_name_offset(m, dev->set_state_shutdown); |
bd624d75 VK |
244 | SEQ_printf(m, "\n"); |
245 | } | |
246 | ||
77e32c89 | 247 | if (dev->set_state_periodic) { |
bd624d75 | 248 | SEQ_printf(m, " periodic: "); |
77e32c89 | 249 | print_name_offset(m, dev->set_state_periodic); |
bd624d75 VK |
250 | SEQ_printf(m, "\n"); |
251 | } | |
252 | ||
77e32c89 | 253 | if (dev->set_state_oneshot) { |
bd624d75 | 254 | SEQ_printf(m, " oneshot: "); |
77e32c89 | 255 | print_name_offset(m, dev->set_state_oneshot); |
bd624d75 VK |
256 | SEQ_printf(m, "\n"); |
257 | } | |
258 | ||
8fff52fd VK |
259 | if (dev->set_state_oneshot_stopped) { |
260 | SEQ_printf(m, " oneshot stopped: "); | |
261 | print_name_offset(m, dev->set_state_oneshot_stopped); | |
262 | SEQ_printf(m, "\n"); | |
263 | } | |
264 | ||
554ef387 | 265 | if (dev->tick_resume) { |
bd624d75 | 266 | SEQ_printf(m, " resume: "); |
554ef387 | 267 | print_name_offset(m, dev->tick_resume); |
bd624d75 VK |
268 | SEQ_printf(m, "\n"); |
269 | } | |
270 | } | |
289f480a IM |
271 | |
272 | SEQ_printf(m, " event_handler: "); | |
273 | print_name_offset(m, dev->event_handler); | |
274 | SEQ_printf(m, "\n"); | |
80a05b9f | 275 | SEQ_printf(m, " retries: %lu\n", dev->retries); |
60cf7ea8 | 276 | SEQ_printf(m, "\n"); |
289f480a IM |
277 | } |
278 | ||
60cf7ea8 | 279 | static void timer_list_show_tickdevices_header(struct seq_file *m) |
289f480a | 280 | { |
289f480a | 281 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
c5b77a3d | 282 | print_tickdevice(m, tick_get_broadcast_device(), -1); |
1ef09cd7 PM |
283 | SEQ_printf(m, "tick_broadcast_mask: %*pb\n", |
284 | cpumask_pr_args(tick_get_broadcast_mask())); | |
289f480a | 285 | #ifdef CONFIG_TICK_ONESHOT |
1ef09cd7 PM |
286 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n", |
287 | cpumask_pr_args(tick_get_broadcast_oneshot_mask())); | |
289f480a IM |
288 | #endif |
289 | SEQ_printf(m, "\n"); | |
290 | #endif | |
289f480a | 291 | } |
289f480a IM |
292 | #endif |
293 | ||
b3956a89 | 294 | static inline void timer_list_header(struct seq_file *m, u64 now) |
289f480a | 295 | { |
c1ad348b | 296 | SEQ_printf(m, "Timer List Version: v0.8\n"); |
289f480a IM |
297 | SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); |
298 | SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); | |
60cf7ea8 | 299 | SEQ_printf(m, "\n"); |
b3956a89 NZ |
300 | } |
301 | ||
302 | static int timer_list_show(struct seq_file *m, void *v) | |
303 | { | |
304 | struct timer_list_iter *iter = v; | |
b3956a89 NZ |
305 | |
306 | if (iter->cpu == -1 && !iter->second_pass) | |
84a78a65 | 307 | timer_list_header(m, iter->now); |
b3956a89 NZ |
308 | else if (!iter->second_pass) |
309 | print_cpu(m, iter->cpu, iter->now); | |
310 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
311 | else if (iter->cpu == -1 && iter->second_pass) | |
312 | timer_list_show_tickdevices_header(m); | |
313 | else | |
314 | print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu); | |
315 | #endif | |
316 | return 0; | |
317 | } | |
318 | ||
319 | void sysrq_timer_list_show(void) | |
320 | { | |
321 | u64 now = ktime_to_ns(ktime_get()); | |
322 | int cpu; | |
323 | ||
324 | timer_list_header(NULL, now); | |
289f480a IM |
325 | |
326 | for_each_online_cpu(cpu) | |
b3956a89 | 327 | print_cpu(NULL, cpu, now); |
289f480a | 328 | |
60cf7ea8 | 329 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
b3956a89 | 330 | timer_list_show_tickdevices_header(NULL); |
60cf7ea8 | 331 | for_each_online_cpu(cpu) |
b3956a89 | 332 | print_tickdevice(NULL, tick_get_device(cpu), cpu); |
60cf7ea8 | 333 | #endif |
b3956a89 NZ |
334 | return; |
335 | } | |
289f480a | 336 | |
84a78a65 | 337 | static void *move_iter(struct timer_list_iter *iter, loff_t offset) |
b3956a89 | 338 | { |
84a78a65 NZ |
339 | for (; offset; offset--) { |
340 | iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); | |
341 | if (iter->cpu >= nr_cpu_ids) { | |
b3956a89 | 342 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
84a78a65 NZ |
343 | if (!iter->second_pass) { |
344 | iter->cpu = -1; | |
345 | iter->second_pass = true; | |
346 | } else | |
347 | return NULL; | |
b3956a89 | 348 | #else |
84a78a65 | 349 | return NULL; |
b3956a89 | 350 | #endif |
84a78a65 | 351 | } |
b3956a89 NZ |
352 | } |
353 | return iter; | |
289f480a IM |
354 | } |
355 | ||
84a78a65 NZ |
356 | static void *timer_list_start(struct seq_file *file, loff_t *offset) |
357 | { | |
358 | struct timer_list_iter *iter = file->private; | |
359 | ||
360 | if (!*offset) | |
361 | iter->now = ktime_to_ns(ktime_get()); | |
362 | iter->cpu = -1; | |
363 | iter->second_pass = false; | |
364 | return move_iter(iter, *offset); | |
365 | } | |
366 | ||
b3956a89 | 367 | static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) |
289f480a | 368 | { |
b3956a89 | 369 | struct timer_list_iter *iter = file->private; |
b3956a89 | 370 | ++*offset; |
84a78a65 | 371 | return move_iter(iter, 1); |
289f480a IM |
372 | } |
373 | ||
b3956a89 NZ |
374 | static void timer_list_stop(struct seq_file *seq, void *v) |
375 | { | |
376 | } | |
377 | ||
378 | static const struct seq_operations timer_list_sops = { | |
379 | .start = timer_list_start, | |
380 | .next = timer_list_next, | |
381 | .stop = timer_list_stop, | |
382 | .show = timer_list_show, | |
383 | }; | |
384 | ||
289f480a IM |
385 | static int timer_list_open(struct inode *inode, struct file *filp) |
386 | { | |
b3956a89 NZ |
387 | return seq_open_private(filp, &timer_list_sops, |
388 | sizeof(struct timer_list_iter)); | |
289f480a IM |
389 | } |
390 | ||
828c0950 | 391 | static const struct file_operations timer_list_fops = { |
289f480a IM |
392 | .open = timer_list_open, |
393 | .read = seq_read, | |
394 | .llseek = seq_lseek, | |
b3956a89 | 395 | .release = seq_release_private, |
289f480a IM |
396 | }; |
397 | ||
398 | static int __init init_timer_list_procfs(void) | |
399 | { | |
400 | struct proc_dir_entry *pe; | |
401 | ||
de809347 | 402 | pe = proc_create("timer_list", 0444, NULL, &timer_list_fops); |
289f480a IM |
403 | if (!pe) |
404 | return -ENOMEM; | |
289f480a IM |
405 | return 0; |
406 | } | |
407 | __initcall(init_timer_list_procfs); |