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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#include <linux/tick.h>
20
21#include <asm/uaccess.h>
22
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
32DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
33
34
35
36
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
46static void print_name_offset(struct seq_file *m, void *sym)
47{
48 char symname[KSYM_NAME_LEN];
49
50 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
51 SEQ_printf(m, "<%pK>", sym);
52 else
53 SEQ_printf(m, "%s", symname);
54}
55
56static void
57print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
58 int idx, u64 now)
59{
60#ifdef CONFIG_TIMER_STATS
61 char tmp[TASK_COMM_LEN + 1];
62#endif
63 SEQ_printf(m, " #%d: ", idx);
64 print_name_offset(m, taddr);
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");
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)),
78 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
79 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
80 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
81}
82
83static void
84print_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;
89 struct timerqueue_node *curr;
90 unsigned long flags;
91
92next_one:
93 i = 0;
94 raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
95
96 curr = timerqueue_getnext(&base->active);
97
98
99
100
101 while (curr && i < next) {
102 curr = timerqueue_iterate_next(curr);
103 i++;
104 }
105
106 if (curr) {
107
108 timer = container_of(curr, struct hrtimer, node);
109 tmp = *timer;
110 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
111
112 print_timer(m, timer, &tmp, i, now);
113 next++;
114 goto next_one;
115 }
116 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
117}
118
119static void
120print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
121{
122 SEQ_printf(m, " .base: %pK\n", base);
123 SEQ_printf(m, " .index: %d\n",
124 base->index);
125 SEQ_printf(m, " .resolution: %Lu nsecs\n",
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
131 SEQ_printf(m, " .offset: %Lu nsecs\n",
132 (unsigned long long) ktime_to_ns(base->offset));
133#endif
134 SEQ_printf(m, "active timers:\n");
135 print_active_timers(m, base, now);
136}
137
138static 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
143 SEQ_printf(m, "cpu: %d\n", cpu);
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) \
149 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
150 (unsigned long long)(cpu_base->x))
151#define P_ns(x) \
152 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
153 (unsigned long long)(ktime_to_ns(cpu_base->x)))
154
155#ifdef CONFIG_HIGH_RES_TIMERS
156 P_ns(expires_next);
157 P(hres_active);
158 P(nr_events);
159 P(nr_retries);
160 P(nr_hangs);
161 P_ns(max_hang_time);
162#endif
163#undef P
164#undef P_ns
165
166#ifdef CONFIG_TICK_ONESHOT
167# define P(x) \
168 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
169 (unsigned long long)(ts->x))
170# define P_ns(x) \
171 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
172 (unsigned long long)(ktime_to_ns(ts->x)))
173 {
174 struct tick_sched *ts = tick_get_tick_sched(cpu);
175 P(nohz_mode);
176 P_ns(last_tick);
177 P(tick_stopped);
178 P(idle_jiffies);
179 P(idle_calls);
180 P(idle_sleeps);
181 P_ns(idle_entrytime);
182 P_ns(idle_waketime);
183 P_ns(idle_exittime);
184 P_ns(idle_sleeptime);
185 P_ns(iowait_sleeptime);
186 P(last_jiffies);
187 P(next_jiffies);
188 P_ns(idle_expires);
189 SEQ_printf(m, "jiffies: %Lu\n",
190 (unsigned long long)jiffies);
191 }
192#endif
193
194#undef P
195#undef P_ns
196 SEQ_printf(m, "\n");
197}
198
199#ifdef CONFIG_GENERIC_CLOCKEVENTS
200static void
201print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
202{
203 struct clock_event_device *dev = td->evtdev;
204
205 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
206 if (cpu < 0)
207 SEQ_printf(m, "Broadcast device\n");
208 else
209 SEQ_printf(m, "Per CPU device: %d\n", cpu);
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);
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);
221 SEQ_printf(m, " mult: %u\n", dev->mult);
222 SEQ_printf(m, " shift: %u\n", dev->shift);
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");
238 SEQ_printf(m, " retries: %lu\n", dev->retries);
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: %08lx\n",
247 cpumask_bits(tick_get_broadcast_mask())[0]);
248#ifdef CONFIG_TICK_ONESHOT
249 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
250 cpumask_bits(tick_get_broadcast_oneshot_mask())[0]);
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: v0.7\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
265static int timer_list_show(struct seq_file *m, void *v)
266{
267 struct timer_list_iter *iter = v;
268
269 if (iter->cpu == -1 && !iter->second_pass)
270 timer_list_header(m, iter->now);
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
282void sysrq_timer_list_show(void)
283{
284 u64 now = ktime_to_ns(ktime_get());
285 int cpu;
286
287 timer_list_header(NULL, now);
288
289 for_each_online_cpu(cpu)
290 print_cpu(NULL, cpu, now);
291
292#ifdef CONFIG_GENERIC_CLOCKEVENTS
293 timer_list_show_tickdevices_header(NULL);
294 for_each_online_cpu(cpu)
295 print_tickdevice(NULL, tick_get_device(cpu), cpu);
296#endif
297 return;
298}
299
300static void *move_iter(struct timer_list_iter *iter, loff_t offset)
301{
302 for (; offset; offset--) {
303 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
304 if (iter->cpu >= nr_cpu_ids) {
305#ifdef CONFIG_GENERIC_CLOCKEVENTS
306 if (!iter->second_pass) {
307 iter->cpu = -1;
308 iter->second_pass = true;
309 } else
310 return NULL;
311#else
312 return NULL;
313#endif
314 }
315 }
316 return iter;
317}
318
319static 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
330static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
331{
332 struct timer_list_iter *iter = file->private;
333 ++*offset;
334 return move_iter(iter, 1);
335}
336
337static void timer_list_stop(struct seq_file *seq, void *v)
338{
339}
340
341static 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
348static int timer_list_open(struct inode *inode, struct file *filp)
349{
350 return seq_open_private(filp, &timer_list_sops,
351 sizeof(struct timer_list_iter));
352}
353
354static const struct file_operations timer_list_fops = {
355 .open = timer_list_open,
356 .read = seq_read,
357 .llseek = seq_lseek,
358 .release = seq_release_private,
359};
360
361static int __init init_timer_list_procfs(void)
362{
363 struct proc_dir_entry *pe;
364
365 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
366 if (!pe)
367 return -ENOMEM;
368 return 0;
369}
370__initcall(init_timer_list_procfs);
371
