Commit | Line | Data |
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35728b82 | 1 | // SPDX-License-Identifier: GPL-2.0 |
289f480a | 2 | /* |
289f480a IM |
3 | * List pending timers |
4 | * | |
5 | * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar | |
289f480a IM |
6 | */ |
7 | ||
8 | #include <linux/proc_fs.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/kallsyms.h> | |
01070427 | 14 | #include <linux/nmi.h> |
289f480a | 15 | |
7c0f6ba6 | 16 | #include <linux/uaccess.h> |
289f480a | 17 | |
c1797baf | 18 | #include "tick-internal.h" |
b3956a89 NZ |
19 | |
20 | struct timer_list_iter { | |
21 | int cpu; | |
22 | bool second_pass; | |
23 | u64 now; | |
24 | }; | |
25 | ||
289f480a IM |
26 | /* |
27 | * This allows printing both to /proc/timer_list and | |
28 | * to the console (on SysRq-Q): | |
29 | */ | |
7de4e744 JP |
30 | __printf(2, 3) |
31 | static void SEQ_printf(struct seq_file *m, const char *fmt, ...) | |
32 | { | |
33 | va_list args; | |
34 | ||
35 | va_start(args, fmt); | |
36 | ||
37 | if (m) | |
38 | seq_vprintf(m, fmt, args); | |
39 | else | |
40 | vprintk(fmt, args); | |
41 | ||
42 | va_end(args); | |
43 | } | |
289f480a | 44 | |
289f480a | 45 | static void |
e67ef25a TG |
46 | print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, |
47 | int idx, u64 now) | |
289f480a | 48 | { |
da88f9b3 | 49 | SEQ_printf(m, " #%d: <%pK>, %ps", idx, taddr, timer->function); |
203cbf77 | 50 | SEQ_printf(m, ", S:%02x", timer->state); |
289f480a | 51 | SEQ_printf(m, "\n"); |
704af52b AV |
52 | SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", |
53 | (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)), | |
cc584b21 | 54 | (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)), |
704af52b | 55 | (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now), |
cc584b21 | 56 | (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now)); |
289f480a IM |
57 | } |
58 | ||
59 | static void | |
60 | print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, | |
61 | u64 now) | |
62 | { | |
63 | struct hrtimer *timer, tmp; | |
64 | unsigned long next = 0, i; | |
998adc3d | 65 | struct timerqueue_node *curr; |
289f480a IM |
66 | unsigned long flags; |
67 | ||
68 | next_one: | |
69 | i = 0; | |
01070427 TH |
70 | |
71 | touch_nmi_watchdog(); | |
72 | ||
ecb49d1a | 73 | raw_spin_lock_irqsave(&base->cpu_base->lock, flags); |
289f480a | 74 | |
998adc3d | 75 | curr = timerqueue_getnext(&base->active); |
289f480a IM |
76 | /* |
77 | * Crude but we have to do this O(N*N) thing, because | |
78 | * we have to unlock the base when printing: | |
79 | */ | |
80 | while (curr && i < next) { | |
998adc3d | 81 | curr = timerqueue_iterate_next(curr); |
289f480a IM |
82 | i++; |
83 | } | |
84 | ||
85 | if (curr) { | |
86 | ||
998adc3d | 87 | timer = container_of(curr, struct hrtimer, node); |
289f480a | 88 | tmp = *timer; |
ecb49d1a | 89 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a | 90 | |
e67ef25a | 91 | print_timer(m, timer, &tmp, i, now); |
289f480a IM |
92 | next++; |
93 | goto next_one; | |
94 | } | |
ecb49d1a | 95 | raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags); |
289f480a IM |
96 | } |
97 | ||
98 | static void | |
99 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) | |
100 | { | |
f5903085 | 101 | SEQ_printf(m, " .base: %pK\n", base); |
398ca17f TG |
102 | SEQ_printf(m, " .index: %d\n", base->index); |
103 | ||
7551b02b | 104 | SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution); |
398ca17f | 105 | |
da88f9b3 | 106 | SEQ_printf(m, " .get_time: %ps\n", base->get_time); |
289f480a | 107 | #ifdef CONFIG_HIGH_RES_TIMERS |
9b04bd27 DM |
108 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
109 | (unsigned long long) ktime_to_ns(base->offset)); | |
289f480a IM |
110 | #endif |
111 | SEQ_printf(m, "active timers:\n"); | |
38bf985b | 112 | print_active_timers(m, base, now + ktime_to_ns(base->offset)); |
289f480a IM |
113 | } |
114 | ||
115 | static void print_cpu(struct seq_file *m, int cpu, u64 now) | |
116 | { | |
117 | struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); | |
118 | int i; | |
119 | ||
129f1d2c | 120 | SEQ_printf(m, "cpu: %d\n", cpu); |
289f480a IM |
121 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
122 | SEQ_printf(m, " clock %d:\n", i); | |
123 | print_base(m, cpu_base->clock_base + i, now); | |
124 | } | |
125 | #define P(x) \ | |
9b04bd27 DM |
126 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
127 | (unsigned long long)(cpu_base->x)) | |
289f480a | 128 | #define P_ns(x) \ |
9b04bd27 DM |
129 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
130 | (unsigned long long)(ktime_to_ns(cpu_base->x))) | |
289f480a IM |
131 | |
132 | #ifdef CONFIG_HIGH_RES_TIMERS | |
133 | P_ns(expires_next); | |
134 | P(hres_active); | |
135 | P(nr_events); | |
41d2e494 TG |
136 | P(nr_retries); |
137 | P(nr_hangs); | |
a6ffebce | 138 | P(max_hang_time); |
289f480a IM |
139 | #endif |
140 | #undef P | |
141 | #undef P_ns | |
142 | ||
143 | #ifdef CONFIG_TICK_ONESHOT | |
144 | # define P(x) \ | |
9b04bd27 DM |
145 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
146 | (unsigned long long)(ts->x)) | |
289f480a | 147 | # define P_ns(x) \ |
9b04bd27 DM |
148 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
149 | (unsigned long long)(ktime_to_ns(ts->x))) | |
289f480a IM |
150 | { |
151 | struct tick_sched *ts = tick_get_tick_sched(cpu); | |
152 | P(nohz_mode); | |
f5d411c9 | 153 | P_ns(last_tick); |
289f480a IM |
154 | P(tick_stopped); |
155 | P(idle_jiffies); | |
156 | P(idle_calls); | |
157 | P(idle_sleeps); | |
158 | P_ns(idle_entrytime); | |
5df7fa1c TG |
159 | P_ns(idle_waketime); |
160 | P_ns(idle_exittime); | |
289f480a | 161 | P_ns(idle_sleeptime); |
0224cf4c | 162 | P_ns(iowait_sleeptime); |
289f480a | 163 | P(last_jiffies); |
c1ad348b | 164 | P(next_timer); |
289f480a | 165 | P_ns(idle_expires); |
9b04bd27 DM |
166 | SEQ_printf(m, "jiffies: %Lu\n", |
167 | (unsigned long long)jiffies); | |
289f480a IM |
168 | } |
169 | #endif | |
170 | ||
171 | #undef P | |
172 | #undef P_ns | |
60cf7ea8 | 173 | SEQ_printf(m, "\n"); |
289f480a IM |
174 | } |
175 | ||
176 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
177 | static void | |
c5b77a3d | 178 | print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) |
289f480a IM |
179 | { |
180 | struct clock_event_device *dev = td->evtdev; | |
181 | ||
01070427 TH |
182 | touch_nmi_watchdog(); |
183 | ||
129f1d2c | 184 | SEQ_printf(m, "Tick Device: mode: %d\n", td->mode); |
c5b77a3d TG |
185 | if (cpu < 0) |
186 | SEQ_printf(m, "Broadcast device\n"); | |
187 | else | |
188 | SEQ_printf(m, "Per CPU device: %d\n", cpu); | |
289f480a IM |
189 | |
190 | SEQ_printf(m, "Clock Event Device: "); | |
191 | if (!dev) { | |
192 | SEQ_printf(m, "<NULL>\n"); | |
193 | return; | |
194 | } | |
195 | SEQ_printf(m, "%s\n", dev->name); | |
97813f2f JH |
196 | SEQ_printf(m, " max_delta_ns: %llu\n", |
197 | (unsigned long long) dev->max_delta_ns); | |
198 | SEQ_printf(m, " min_delta_ns: %llu\n", | |
199 | (unsigned long long) dev->min_delta_ns); | |
23af368e TG |
200 | SEQ_printf(m, " mult: %u\n", dev->mult); |
201 | SEQ_printf(m, " shift: %u\n", dev->shift); | |
eef7635a | 202 | SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev)); |
289f480a IM |
203 | SEQ_printf(m, " next_event: %Ld nsecs\n", |
204 | (unsigned long long) ktime_to_ns(dev->next_event)); | |
205 | ||
da88f9b3 | 206 | SEQ_printf(m, " set_next_event: %ps\n", dev->set_next_event); |
289f480a | 207 | |
da88f9b3 HD |
208 | if (dev->set_state_shutdown) |
209 | SEQ_printf(m, " shutdown: %ps\n", | |
210 | dev->set_state_shutdown); | |
eef7635a | 211 | |
da88f9b3 HD |
212 | if (dev->set_state_periodic) |
213 | SEQ_printf(m, " periodic: %ps\n", | |
214 | dev->set_state_periodic); | |
eef7635a | 215 | |
da88f9b3 HD |
216 | if (dev->set_state_oneshot) |
217 | SEQ_printf(m, " oneshot: %ps\n", | |
218 | dev->set_state_oneshot); | |
eef7635a | 219 | |
da88f9b3 HD |
220 | if (dev->set_state_oneshot_stopped) |
221 | SEQ_printf(m, " oneshot stopped: %ps\n", | |
222 | dev->set_state_oneshot_stopped); | |
eef7635a | 223 | |
da88f9b3 HD |
224 | if (dev->tick_resume) |
225 | SEQ_printf(m, " resume: %ps\n", | |
226 | dev->tick_resume); | |
289f480a | 227 | |
da88f9b3 | 228 | SEQ_printf(m, " event_handler: %ps\n", dev->event_handler); |
289f480a | 229 | SEQ_printf(m, "\n"); |
80a05b9f | 230 | SEQ_printf(m, " retries: %lu\n", dev->retries); |
245a057f WD |
231 | |
232 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST | |
233 | if (cpu >= 0) { | |
234 | const struct clock_event_device *wd = tick_get_wakeup_device(cpu); | |
235 | ||
236 | SEQ_printf(m, "Wakeup Device: %s\n", wd ? wd->name : "<NULL>"); | |
237 | } | |
238 | #endif | |
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); |
1ef09cd7 PM |
246 | SEQ_printf(m, "tick_broadcast_mask: %*pb\n", |
247 | cpumask_pr_args(tick_get_broadcast_mask())); | |
289f480a | 248 | #ifdef CONFIG_TICK_ONESHOT |
1ef09cd7 PM |
249 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n", |
250 | cpumask_pr_args(tick_get_broadcast_oneshot_mask())); | |
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 | { |
245a057f | 259 | SEQ_printf(m, "Timer List Version: v0.9\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 | ||
b3956a89 NZ |
265 | void sysrq_timer_list_show(void) |
266 | { | |
267 | u64 now = ktime_to_ns(ktime_get()); | |
268 | int cpu; | |
269 | ||
270 | timer_list_header(NULL, now); | |
289f480a IM |
271 | |
272 | for_each_online_cpu(cpu) | |
b3956a89 | 273 | print_cpu(NULL, cpu, now); |
289f480a | 274 | |
60cf7ea8 | 275 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
b3956a89 | 276 | timer_list_show_tickdevices_header(NULL); |
60cf7ea8 | 277 | for_each_online_cpu(cpu) |
b3956a89 | 278 | print_tickdevice(NULL, tick_get_device(cpu), cpu); |
60cf7ea8 | 279 | #endif |
b3956a89 NZ |
280 | return; |
281 | } | |
289f480a | 282 | |
a9314773 NH |
283 | #ifdef CONFIG_PROC_FS |
284 | static int timer_list_show(struct seq_file *m, void *v) | |
285 | { | |
286 | struct timer_list_iter *iter = v; | |
287 | ||
288 | if (iter->cpu == -1 && !iter->second_pass) | |
289 | timer_list_header(m, iter->now); | |
290 | else if (!iter->second_pass) | |
291 | print_cpu(m, iter->cpu, iter->now); | |
292 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
293 | else if (iter->cpu == -1 && iter->second_pass) | |
294 | timer_list_show_tickdevices_header(m); | |
295 | else | |
296 | print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu); | |
297 | #endif | |
298 | return 0; | |
299 | } | |
300 | ||
84a78a65 | 301 | static void *move_iter(struct timer_list_iter *iter, loff_t offset) |
b3956a89 | 302 | { |
84a78a65 NZ |
303 | for (; offset; offset--) { |
304 | iter->cpu = cpumask_next(iter->cpu, cpu_online_mask); | |
305 | if (iter->cpu >= nr_cpu_ids) { | |
b3956a89 | 306 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
84a78a65 NZ |
307 | if (!iter->second_pass) { |
308 | iter->cpu = -1; | |
309 | iter->second_pass = true; | |
310 | } else | |
311 | return NULL; | |
b3956a89 | 312 | #else |
84a78a65 | 313 | return NULL; |
b3956a89 | 314 | #endif |
84a78a65 | 315 | } |
b3956a89 NZ |
316 | } |
317 | return iter; | |
289f480a IM |
318 | } |
319 | ||
84a78a65 NZ |
320 | static void *timer_list_start(struct seq_file *file, loff_t *offset) |
321 | { | |
322 | struct timer_list_iter *iter = file->private; | |
323 | ||
324 | if (!*offset) | |
325 | iter->now = ktime_to_ns(ktime_get()); | |
326 | iter->cpu = -1; | |
327 | iter->second_pass = false; | |
328 | return move_iter(iter, *offset); | |
329 | } | |
330 | ||
b3956a89 | 331 | static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset) |
289f480a | 332 | { |
b3956a89 | 333 | struct timer_list_iter *iter = file->private; |
b3956a89 | 334 | ++*offset; |
84a78a65 | 335 | return move_iter(iter, 1); |
289f480a IM |
336 | } |
337 | ||
b3956a89 NZ |
338 | static void timer_list_stop(struct seq_file *seq, void *v) |
339 | { | |
340 | } | |
341 | ||
342 | static const struct seq_operations timer_list_sops = { | |
343 | .start = timer_list_start, | |
344 | .next = timer_list_next, | |
345 | .stop = timer_list_stop, | |
346 | .show = timer_list_show, | |
347 | }; | |
348 | ||
289f480a IM |
349 | static int __init init_timer_list_procfs(void) |
350 | { | |
351 | struct proc_dir_entry *pe; | |
352 | ||
44414d82 CH |
353 | pe = proc_create_seq_private("timer_list", 0400, NULL, &timer_list_sops, |
354 | sizeof(struct timer_list_iter), NULL); | |
289f480a IM |
355 | if (!pe) |
356 | return -ENOMEM; | |
289f480a IM |
357 | return 0; |
358 | } | |
359 | __initcall(init_timer_list_procfs); | |
a9314773 | 360 | #endif |