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> | |
19 | #include <linux/tick.h> | |
20 | ||
21 | #include <asm/uaccess.h> | |
22 | ||
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 | ||
32 | DECLARE_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 | ||
46 | static void print_name_offset(struct seq_file *m, void *sym) | |
47 | { | |
9281acea | 48 | char symname[KSYM_NAME_LEN]; |
289f480a | 49 | |
9d65cb4a | 50 | if (lookup_symbol_name((unsigned long)sym, symname) < 0) |
f5903085 | 51 | SEQ_printf(m, "<%pK>", sym); |
9d65cb4a AD |
52 | else |
53 | SEQ_printf(m, "%s", symname); | |
289f480a IM |
54 | } |
55 | ||
56 | static void | |
e67ef25a TG |
57 | print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
58 | int idx, u64 now) | |
289f480a IM |
59 | { |
60 | #ifdef CONFIG_TIMER_STATS | |
61 | char tmp[TASK_COMM_LEN + 1]; | |
62 | #endif | |
63 | SEQ_printf(m, " #%d: ", idx); | |
e67ef25a | 64 | print_name_offset(m, taddr); |
289f480a IM |
65 | 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"); | |
704af52b AV |
76 | 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)), | |
cc584b21 | 78 | (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
704af52b | 79 | (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
cc584b21 | 80 | (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
289f480a IM |
81 | } |
82 | ||
83 | static void | |
84 | print_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; | |
998adc3d | 89 | struct timerqueue_node *curr; |
289f480a IM |
90 | unsigned long flags; |
91 | ||
92 | next_one: | |
93 | i = 0; | |
ecb49d1a | 94 | raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
289f480a | 95 | |
998adc3d | 96 | curr = timerqueue_getnext(&base->active); |
289f480a IM |
97 | /* |
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) { | |
998adc3d | 102 | curr = timerqueue_iterate_next(curr); |
289f480a IM |
103 | i++; |
104 | } | |
105 | ||
106 | if (curr) { | |
107 | ||
998adc3d | 108 | timer = container_of(curr, struct hrtimer, node); |
289f480a | 109 | tmp = *timer; |
ecb49d1a | 110 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a | 111 | |
e67ef25a | 112 | print_timer(m, timer, &tmp, i, now); |
289f480a IM |
113 | next++; |
114 | goto next_one; | |
115 | } | |
ecb49d1a | 116 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a IM |
117 | } |
118 | ||
119 | static void | |
120 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) | |
121 | { | |
f5903085 | 122 | SEQ_printf(m, " .base: %pK\n", base); |
289f480a IM |
123 | SEQ_printf(m, " .index: %d\n", |
124 | base->index); | |
9b04bd27 | 125 | SEQ_printf(m, " .resolution: %Lu nsecs\n", |
289f480a IM |
126 | (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 | |
9b04bd27 DM |
131 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
132 | (unsigned long long) ktime_to_ns(base->offset)); | |
289f480a IM |
133 | #endif |
134 | SEQ_printf(m, "active timers:\n"); | |
135 | print_active_timers(m, base, now); | |
136 | } | |
137 | ||
138 | static 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 | ||
129f1d2c | 143 | SEQ_printf(m, "cpu: %d\n", cpu); |
289f480a IM |
144 | 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) \ | |
9b04bd27 DM |
149 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
150 | (unsigned long long)(cpu_base->x)) | |
289f480a | 151 | #define P_ns(x) \ |
9b04bd27 DM |
152 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
153 | (unsigned long long)(ktime_to_ns(cpu_base->x))) | |
289f480a IM |
154 | |
155 | #ifdef CONFIG_HIGH_RES_TIMERS | |
156 | P_ns(expires_next); | |
157 | P(hres_active); | |
158 | P(nr_events); | |
41d2e494 TG |
159 | P(nr_retries); |
160 | P(nr_hangs); | |
161 | P_ns(max_hang_time); | |
289f480a IM |
162 | #endif |
163 | #undef P | |
164 | #undef P_ns | |
165 | ||
166 | #ifdef CONFIG_TICK_ONESHOT | |
167 | # define P(x) \ | |
9b04bd27 DM |
168 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
169 | (unsigned long long)(ts->x)) | |
289f480a | 170 | # define P_ns(x) \ |
9b04bd27 DM |
171 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
172 | (unsigned long long)(ktime_to_ns(ts->x))) | |
289f480a IM |
173 | { |
174 | struct tick_sched *ts = tick_get_tick_sched(cpu); | |
175 | P(nohz_mode); | |
f5d411c9 | 176 | P_ns(last_tick); |
289f480a IM |
177 | P(tick_stopped); |
178 | P(idle_jiffies); | |
179 | P(idle_calls); | |
180 | P(idle_sleeps); | |
181 | P_ns(idle_entrytime); | |
5df7fa1c TG |
182 | P_ns(idle_waketime); |
183 | P_ns(idle_exittime); | |
289f480a | 184 | P_ns(idle_sleeptime); |
0224cf4c | 185 | P_ns(iowait_sleeptime); |
289f480a IM |
186 | P(last_jiffies); |
187 | P(next_jiffies); | |
188 | P_ns(idle_expires); | |
9b04bd27 DM |
189 | SEQ_printf(m, "jiffies: %Lu\n", |
190 | (unsigned long long)jiffies); | |
289f480a IM |
191 | } |
192 | #endif | |
193 | ||
194 | #undef P | |
195 | #undef P_ns | |
60cf7ea8 | 196 | SEQ_printf(m, "\n"); |
289f480a IM |
197 | } |
198 | ||
199 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
200 | static void | |
c5b77a3d | 201 | print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
289f480a IM |
202 | { |
203 | struct clock_event_device *dev = td->evtdev; | |
204 | ||
129f1d2c | 205 | SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
c5b77a3d TG |
206 | if (cpu < 0) |
207 | SEQ_printf(m, "Broadcast device\n"); | |
208 | else | |
209 | SEQ_printf(m, "Per CPU device: %d\n", cpu); | |
289f480a IM |
210 | |
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); | |
97813f2f JH |
217 | 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); | |
23af368e TG |
221 | SEQ_printf(m, " mult: %u\n", dev->mult); |
222 | SEQ_printf(m, " shift: %u\n", dev->shift); | |
289f480a IM |
223 | 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"); | |
80a05b9f | 238 | SEQ_printf(m, " retries: %lu\n", dev->retries); |
60cf7ea8 | 239 | SEQ_printf(m, "\n"); |
289f480a IM |
240 | } |
241 | ||
60cf7ea8 | 242 | static void timer_list_show_tickdevices_header(struct seq_file *m) |
289f480a | 243 | { |
289f480a | 244 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
c5b77a3d | 245 | print_tickdevice(m, tick_get_broadcast_device(), -1); |
289f480a | 246 | SEQ_printf(m, "tick_broadcast_mask: %08lx\n", |
62ac1279 | 247 | cpumask_bits(tick_get_broadcast_mask())[0]); |
289f480a IM |
248 | #ifdef CONFIG_TICK_ONESHOT |
249 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", | |
62ac1279 | 250 | cpumask_bits(tick_get_broadcast_oneshot_mask())[0]); |
289f480a IM |
251 | #endif |
252 | SEQ_printf(m, "\n"); | |
253 | #endif | |
289f480a | 254 | } |
289f480a IM |
255 | #endif |
256 | ||
b3956a89 | 257 | static inline void timer_list_header(struct seq_file *m, u64 now) |
289f480a | 258 | { |
f5d411c9 | 259 | SEQ_printf(m, "Timer List Version: v0.7\n"); |
289f480a IM |
260 | 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); | |
60cf7ea8 | 262 | SEQ_printf(m, "\n"); |
b3956a89 NZ |
263 | } |
264 | ||
265 | static int timer_list_show(struct seq_file *m, void *v) | |
266 | { | |
267 | struct timer_list_iter *iter = v; | |
b3956a89 NZ |
268 | |
269 | if (iter->cpu == -1 && !iter->second_pass) | |
84a78a65 | 270 | timer_list_header(m, iter->now); |
b3956a89 NZ |
271 | else if (!iter->second_pass) |
272 | print_cpu(m, iter->cpu, iter->now); | |
273 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
274 | 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); | |
278 | #endif | |
279 | return 0; | |
280 | } | |
281 | ||
282 | void sysrq_timer_list_show(void) | |
283 | { | |
284 | u64 now = ktime_to_ns(ktime_get()); | |
285 | int cpu; | |
286 | ||
287 | timer_list_header(NULL, now); | |
289f480a IM |
288 | |
289 | for_each_online_cpu(cpu) | |
b3956a89 | 290 | print_cpu(NULL, cpu, now); |
289f480a | 291 | |
60cf7ea8 | 292 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
b3956a89 | 293 | timer_list_show_tickdevices_header(NULL); |
60cf7ea8 | 294 | for_each_online_cpu(cpu) |
b3956a89 | 295 | print_tickdevice(NULL, tick_get_device(cpu), cpu); |
60cf7ea8 | 296 | #endif |
b3956a89 NZ |
297 | return; |
298 | } | |
289f480a | 299 | |
84a78a65 | 300 | static void *move_iter(struct timer_list_iter *iter, loff_t offset) |
b3956a89 | 301 | { |
84a78a65 NZ |
302 | for (; offset; offset--) { |
303 | iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); | |
304 | if (iter->cpu >= nr_cpu_ids) { | |
b3956a89 | 305 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
84a78a65 NZ |
306 | if (!iter->second_pass) { |
307 | iter->cpu = -1; | |
308 | iter->second_pass = true; | |
309 | } else | |
310 | return NULL; | |
b3956a89 | 311 | #else |
84a78a65 | 312 | return NULL; |
b3956a89 | 313 | #endif |
84a78a65 | 314 | } |
b3956a89 NZ |
315 | } |
316 | return iter; | |
289f480a IM |
317 | } |
318 | ||
84a78a65 NZ |
319 | static void *timer_list_start(struct seq_file *file, loff_t *offset) |
320 | { | |
321 | struct timer_list_iter *iter = file->private; | |
322 | ||
323 | if (!*offset) | |
324 | iter->now = ktime_to_ns(ktime_get()); | |
325 | iter->cpu = -1; | |
326 | iter->second_pass = false; | |
327 | return move_iter(iter, *offset); | |
328 | } | |
329 | ||
b3956a89 | 330 | static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) |
289f480a | 331 | { |
b3956a89 | 332 | struct timer_list_iter *iter = file->private; |
b3956a89 | 333 | ++*offset; |
84a78a65 | 334 | return move_iter(iter, 1); |
289f480a IM |
335 | } |
336 | ||
b3956a89 NZ |
337 | static void timer_list_stop(struct seq_file *seq, void *v) |
338 | { | |
339 | } | |
340 | ||
341 | static 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 | ||
289f480a IM |
348 | static int timer_list_open(struct inode *inode, struct file *filp) |
349 | { | |
b3956a89 NZ |
350 | return seq_open_private(filp, &timer_list_sops, |
351 | sizeof(struct timer_list_iter)); | |
289f480a IM |
352 | } |
353 | ||
828c0950 | 354 | static const struct file_operations timer_list_fops = { |
289f480a IM |
355 | .open = timer_list_open, |
356 | .read = seq_read, | |
357 | .llseek = seq_lseek, | |
b3956a89 | 358 | .release = seq_release_private, |
289f480a IM |
359 | }; |
360 | ||
361 | static int __init init_timer_list_procfs(void) | |
362 | { | |
363 | struct proc_dir_entry *pe; | |
364 | ||
de809347 | 365 | pe = proc_create("timer_list", 0444, NULL, &timer_list_fops); |
289f480a IM |
366 | if (!pe) |
367 | return -ENOMEM; | |
289f480a IM |
368 | return 0; |
369 | } | |
370 | __initcall(init_timer_list_procfs); |