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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
20#include <asm/uaccess.h>
21
22#include "tick-internal.h"
23
24struct timer_list_iter {
25 int cpu;
26 bool second_pass;
27 u64 now;
28};
29
30typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
31
32
33
34
35
36__printf(2, 3)
37static 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}
50
51static void print_name_offset(struct seq_file *m, void *sym)
52{
53 char symname[KSYM_NAME_LEN];
54
55 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
56 SEQ_printf(m, "<%pK>", sym);
57 else
58 SEQ_printf(m, "%s", symname);
59}
60
61static void
62print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
63 int idx, u64 now)
64{
65#ifdef CONFIG_TIMER_STATS
66 char tmp[TASK_COMM_LEN + 1];
67#endif
68 SEQ_printf(m, " #%d: ", idx);
69 print_name_offset(m, taddr);
70 SEQ_printf(m, ", ");
71 print_name_offset(m, timer->function);
72 SEQ_printf(m, ", S:%02x", 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");
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)),
83 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
84 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
85 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
86}
87
88static void
89print_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;
94 struct timerqueue_node *curr;
95 unsigned long flags;
96
97next_one:
98 i = 0;
99 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
100
101 curr = timerqueue_getnext(&base->active);
102
103
104
105
106 while (curr && i < next) {
107 curr = timerqueue_iterate_next(curr);
108 i++;
109 }
110
111 if (curr) {
112
113 timer = container_of(curr, struct hrtimer, node);
114 tmp = *timer;
115 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
116
117 print_timer(m, timer, &tmp, i, now);
118 next++;
119 goto next_one;
120 }
121 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
122}
123
124static void
125print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
126{
127 SEQ_printf(m, " .base: %pK\n", base);
128 SEQ_printf(m, " .index: %d\n", base->index);
129
130 SEQ_printf(m, " .resolution: %u nsecs\n", (unsigned) hrtimer_resolution);
131
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
136 SEQ_printf(m, " .offset: %Lu nsecs\n",
137 (unsigned long long) ktime_to_ns(base->offset));
138#endif
139 SEQ_printf(m, "active timers:\n");
140 print_active_timers(m, base, now + ktime_to_ns(base->offset));
141}
142
143static 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
148 SEQ_printf(m, "cpu: %d\n", cpu);
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) \
154 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
155 (unsigned long long)(cpu_base->x))
156#define P_ns(x) \
157 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
158 (unsigned long long)(ktime_to_ns(cpu_base->x)))
159
160#ifdef CONFIG_HIGH_RES_TIMERS
161 P_ns(expires_next);
162 P(hres_active);
163 P(nr_events);
164 P(nr_retries);
165 P(nr_hangs);
166 P(max_hang_time);
167#endif
168#undef P
169#undef P_ns
170
171#ifdef CONFIG_TICK_ONESHOT
172# define P(x) \
173 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
174 (unsigned long long)(ts->x))
175# define P_ns(x) \
176 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
177 (unsigned long long)(ktime_to_ns(ts->x)))
178 {
179 struct tick_sched *ts = tick_get_tick_sched(cpu);
180 P(nohz_mode);
181 P_ns(last_tick);
182 P(tick_stopped);
183 P(idle_jiffies);
184 P(idle_calls);
185 P(idle_sleeps);
186 P_ns(idle_entrytime);
187 P_ns(idle_waketime);
188 P_ns(idle_exittime);
189 P_ns(idle_sleeptime);
190 P_ns(iowait_sleeptime);
191 P(last_jiffies);
192 P(next_timer);
193 P_ns(idle_expires);
194 SEQ_printf(m, "jiffies: %Lu\n",
195 (unsigned long long)jiffies);
196 }
197#endif
198
199#undef P
200#undef P_ns
201 SEQ_printf(m, "\n");
202}
203
204#ifdef CONFIG_GENERIC_CLOCKEVENTS
205static void
206print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
207{
208 struct clock_event_device *dev = td->evtdev;
209
210 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
211 if (cpu < 0)
212 SEQ_printf(m, "Broadcast device\n");
213 else
214 SEQ_printf(m, "Per CPU device: %d\n", cpu);
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);
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);
226 SEQ_printf(m, " mult: %u\n", dev->mult);
227 SEQ_printf(m, " shift: %u\n", dev->shift);
228 SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
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
236 if (dev->set_state_shutdown) {
237 SEQ_printf(m, " shutdown: ");
238 print_name_offset(m, dev->set_state_shutdown);
239 SEQ_printf(m, "\n");
240 }
241
242 if (dev->set_state_periodic) {
243 SEQ_printf(m, " periodic: ");
244 print_name_offset(m, dev->set_state_periodic);
245 SEQ_printf(m, "\n");
246 }
247
248 if (dev->set_state_oneshot) {
249 SEQ_printf(m, " oneshot: ");
250 print_name_offset(m, dev->set_state_oneshot);
251 SEQ_printf(m, "\n");
252 }
253
254 if (dev->set_state_oneshot_stopped) {
255 SEQ_printf(m, " oneshot stopped: ");
256 print_name_offset(m, dev->set_state_oneshot_stopped);
257 SEQ_printf(m, "\n");
258 }
259
260 if (dev->tick_resume) {
261 SEQ_printf(m, " resume: ");
262 print_name_offset(m, dev->tick_resume);
263 SEQ_printf(m, "\n");
264 }
265
266 SEQ_printf(m, " event_handler: ");
267 print_name_offset(m, dev->event_handler);
268 SEQ_printf(m, "\n");
269 SEQ_printf(m, " retries: %lu\n", dev->retries);
270 SEQ_printf(m, "\n");
271}
272
273static void timer_list_show_tickdevices_header(struct seq_file *m)
274{
275#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
276 print_tickdevice(m, tick_get_broadcast_device(), -1);
277 SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
278 cpumask_pr_args(tick_get_broadcast_mask()));
279#ifdef CONFIG_TICK_ONESHOT
280 SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
281 cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
282#endif
283 SEQ_printf(m, "\n");
284#endif
285}
286#endif
287
288static inline void timer_list_header(struct seq_file *m, u64 now)
289{
290 SEQ_printf(m, "Timer List Version: v0.8\n");
291 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
292 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
293 SEQ_printf(m, "\n");
294}
295
296static int timer_list_show(struct seq_file *m, void *v)
297{
298 struct timer_list_iter *iter = v;
299
300 if (iter->cpu == -1 && !iter->second_pass)
301 timer_list_header(m, iter->now);
302 else if (!iter->second_pass)
303 print_cpu(m, iter->cpu, iter->now);
304#ifdef CONFIG_GENERIC_CLOCKEVENTS
305 else if (iter->cpu == -1 && iter->second_pass)
306 timer_list_show_tickdevices_header(m);
307 else
308 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
309#endif
310 return 0;
311}
312
313void sysrq_timer_list_show(void)
314{
315 u64 now = ktime_to_ns(ktime_get());
316 int cpu;
317
318 timer_list_header(NULL, now);
319
320 for_each_online_cpu(cpu)
321 print_cpu(NULL, cpu, now);
322
323#ifdef CONFIG_GENERIC_CLOCKEVENTS
324 timer_list_show_tickdevices_header(NULL);
325 for_each_online_cpu(cpu)
326 print_tickdevice(NULL, tick_get_device(cpu), cpu);
327#endif
328 return;
329}
330
331static void *move_iter(struct timer_list_iter *iter, loff_t offset)
332{
333 for (; offset; offset--) {
334 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
335 if (iter->cpu >= nr_cpu_ids) {
336#ifdef CONFIG_GENERIC_CLOCKEVENTS
337 if (!iter->second_pass) {
338 iter->cpu = -1;
339 iter->second_pass = true;
340 } else
341 return NULL;
342#else
343 return NULL;
344#endif
345 }
346 }
347 return iter;
348}
349
350static void *timer_list_start(struct seq_file *file, loff_t *offset)
351{
352 struct timer_list_iter *iter = file->private;
353
354 if (!*offset)
355 iter->now = ktime_to_ns(ktime_get());
356 iter->cpu = -1;
357 iter->second_pass = false;
358 return move_iter(iter, *offset);
359}
360
361static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
362{
363 struct timer_list_iter *iter = file->private;
364 ++*offset;
365 return move_iter(iter, 1);
366}
367
368static void timer_list_stop(struct seq_file *seq, void *v)
369{
370}
371
372static const struct seq_operations timer_list_sops = {
373 .start = timer_list_start,
374 .next = timer_list_next,
375 .stop = timer_list_stop,
376 .show = timer_list_show,
377};
378
379static int timer_list_open(struct inode *inode, struct file *filp)
380{
381 return seq_open_private(filp, &timer_list_sops,
382 sizeof(struct timer_list_iter));
383}
384
385static const struct file_operations timer_list_fops = {
386 .open = timer_list_open,
387 .read = seq_read,
388 .llseek = seq_lseek,
389 .release = seq_release_private,
390};
391
392static int __init init_timer_list_procfs(void)
393{
394 struct proc_dir_entry *pe;
395
396 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
397 if (!pe)
398 return -ENOMEM;
399 return 0;
400}
401__initcall(init_timer_list_procfs);
402
