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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>
14#include <linux/nmi.h>
15
16#include <linux/uaccess.h>
17
18#include "tick-internal.h"
19
20struct timer_list_iter {
21 int cpu;
22 bool second_pass;
23 u64 now;
24};
25
26
27
28
29
30__printf(2, 3)
31static 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}
44
45static void
46print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
47 int idx, u64 now)
48{
49 SEQ_printf(m, " #%d: <%pK>, %ps", idx, taddr, timer->function);
50 SEQ_printf(m, ", S:%02x", timer->state);
51 SEQ_printf(m, "\n");
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)),
54 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
55 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
56 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
57}
58
59static void
60print_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;
65 struct timerqueue_node *curr;
66 unsigned long flags;
67
68next_one:
69 i = 0;
70
71 touch_nmi_watchdog();
72
73 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
74
75 curr = timerqueue_getnext(&base->active);
76
77
78
79
80 while (curr && i < next) {
81 curr = timerqueue_iterate_next(curr);
82 i++;
83 }
84
85 if (curr) {
86
87 timer = container_of(curr, struct hrtimer, node);
88 tmp = *timer;
89 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
90
91 print_timer(m, timer, &tmp, i, now);
92 next++;
93 goto next_one;
94 }
95 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
96}
97
98static void
99print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
100{
101 SEQ_printf(m, " .base: %pK\n", base);
102 SEQ_printf(m, " .index: %d\n", base->index);
103
104 SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution);
105
106 SEQ_printf(m, " .get_time: %ps\n", base->get_time);
107#ifdef CONFIG_HIGH_RES_TIMERS
108 SEQ_printf(m, " .offset: %Lu nsecs\n",
109 (unsigned long long) ktime_to_ns(base->offset));
110#endif
111 SEQ_printf(m, "active timers:\n");
112 print_active_timers(m, base, now + ktime_to_ns(base->offset));
113}
114
115static 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
120 SEQ_printf(m, "cpu: %d\n", cpu);
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) \
126 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
127 (unsigned long long)(cpu_base->x))
128#define P_ns(x) \
129 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
130 (unsigned long long)(ktime_to_ns(cpu_base->x)))
131
132#ifdef CONFIG_HIGH_RES_TIMERS
133 P_ns(expires_next);
134 P(hres_active);
135 P(nr_events);
136 P(nr_retries);
137 P(nr_hangs);
138 P(max_hang_time);
139#endif
140#undef P
141#undef P_ns
142
143#ifdef CONFIG_TICK_ONESHOT
144# define P(x) \
145 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
146 (unsigned long long)(ts->x))
147# define P_ns(x) \
148 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
149 (unsigned long long)(ktime_to_ns(ts->x)))
150 {
151 struct tick_sched *ts = tick_get_tick_sched(cpu);
152 P(nohz_mode);
153 P_ns(last_tick);
154 P(tick_stopped);
155 P(idle_jiffies);
156 P(idle_calls);
157 P(idle_sleeps);
158 P_ns(idle_entrytime);
159 P_ns(idle_waketime);
160 P_ns(idle_exittime);
161 P_ns(idle_sleeptime);
162 P_ns(iowait_sleeptime);
163 P(last_jiffies);
164 P(next_timer);
165 P_ns(idle_expires);
166 SEQ_printf(m, "jiffies: %Lu\n",
167 (unsigned long long)jiffies);
168 }
169#endif
170
171#undef P
172#undef P_ns
173 SEQ_printf(m, "\n");
174}
175
176#ifdef CONFIG_GENERIC_CLOCKEVENTS
177static void
178print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
179{
180 struct clock_event_device *dev = td->evtdev;
181
182 touch_nmi_watchdog();
183
184 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
185 if (cpu < 0)
186 SEQ_printf(m, "Broadcast device\n");
187 else
188 SEQ_printf(m, "Per CPU device: %d\n", cpu);
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);
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);
200 SEQ_printf(m, " mult: %u\n", dev->mult);
201 SEQ_printf(m, " shift: %u\n", dev->shift);
202 SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
203 SEQ_printf(m, " next_event: %Ld nsecs\n",
204 (unsigned long long) ktime_to_ns(dev->next_event));
205
206 SEQ_printf(m, " set_next_event: %ps\n", dev->set_next_event);
207
208 if (dev->set_state_shutdown)
209 SEQ_printf(m, " shutdown: %ps\n",
210 dev->set_state_shutdown);
211
212 if (dev->set_state_periodic)
213 SEQ_printf(m, " periodic: %ps\n",
214 dev->set_state_periodic);
215
216 if (dev->set_state_oneshot)
217 SEQ_printf(m, " oneshot: %ps\n",
218 dev->set_state_oneshot);
219
220 if (dev->set_state_oneshot_stopped)
221 SEQ_printf(m, " oneshot stopped: %ps\n",
222 dev->set_state_oneshot_stopped);
223
224 if (dev->tick_resume)
225 SEQ_printf(m, " resume: %ps\n",
226 dev->tick_resume);
227
228 SEQ_printf(m, " event_handler: %ps\n", dev->event_handler);
229 SEQ_printf(m, "\n");
230 SEQ_printf(m, " retries: %lu\n", dev->retries);
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
239 SEQ_printf(m, "\n");
240}
241
242static void timer_list_show_tickdevices_header(struct seq_file *m)
243{
244#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
245 print_tickdevice(m, tick_get_broadcast_device(), -1);
246 SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
247 cpumask_pr_args(tick_get_broadcast_mask()));
248#ifdef CONFIG_TICK_ONESHOT
249 SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
250 cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
251#endif
252 SEQ_printf(m, "\n");
253#endif
254}
255#endif
256
257static inline void timer_list_header(struct seq_file *m, u64 now)
258{
259 SEQ_printf(m, "Timer List Version: v0.9\n");
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);
262 SEQ_printf(m, "\n");
263}
264
265void sysrq_timer_list_show(void)
266{
267 u64 now = ktime_to_ns(ktime_get());
268 int cpu;
269
270 timer_list_header(NULL, now);
271
272 for_each_online_cpu(cpu)
273 print_cpu(NULL, cpu, now);
274
275#ifdef CONFIG_GENERIC_CLOCKEVENTS
276 timer_list_show_tickdevices_header(NULL);
277 for_each_online_cpu(cpu)
278 print_tickdevice(NULL, tick_get_device(cpu), cpu);
279#endif
280 return;
281}
282
283#ifdef CONFIG_PROC_FS
284static 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
301static void *move_iter(struct timer_list_iter *iter, loff_t offset)
302{
303 for (; offset; offset--) {
304 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
305 if (iter->cpu >= nr_cpu_ids) {
306#ifdef CONFIG_GENERIC_CLOCKEVENTS
307 if (!iter->second_pass) {
308 iter->cpu = -1;
309 iter->second_pass = true;
310 } else
311 return NULL;
312#else
313 return NULL;
314#endif
315 }
316 }
317 return iter;
318}
319
320static 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
331static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
332{
333 struct timer_list_iter *iter = file->private;
334 ++*offset;
335 return move_iter(iter, 1);
336}
337
338static void timer_list_stop(struct seq_file *seq, void *v)
339{
340}
341
342static 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
349static int __init init_timer_list_procfs(void)
350{
351 struct proc_dir_entry *pe;
352
353 pe = proc_create_seq_private("timer_list", 0400, NULL, &timer_list_sops,
354 sizeof(struct timer_list_iter), NULL);
355 if (!pe)
356 return -ENOMEM;
357 return 0;
358}
359__initcall(init_timer_list_procfs);
360#endif
361
