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Linux/kernel/time/timer_list.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * List pending timers
  4  *
  5  * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
  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>
 14 #include <linux/nmi.h>
 15 
 16 #include <linux/uaccess.h>
 17 
 18 #include "tick-internal.h"
 19 
 20 struct timer_list_iter {
 21         int cpu;
 22         bool second_pass;
 23         u64 now;
 24 };
 25 
 26 /*
 27  * This allows printing both to /proc/timer_list and
 28  * to the console (on SysRq-Q):
 29  */
 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 }
 44 
 45 static void print_name_offset(struct seq_file *m, void *sym)
 46 {
 47         char symname[KSYM_NAME_LEN];
 48 
 49         if (lookup_symbol_name((unsigned long)sym, symname) < 0)
 50                 SEQ_printf(m, "<%pK>", sym);
 51         else
 52                 SEQ_printf(m, "%s", symname);
 53 }
 54 
 55 static void
 56 print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
 57             int idx, u64 now)
 58 {
 59         SEQ_printf(m, " #%d: ", idx);
 60         print_name_offset(m, taddr);
 61         SEQ_printf(m, ", ");
 62         print_name_offset(m, timer->function);
 63         SEQ_printf(m, ", S:%02x", timer->state);
 64         SEQ_printf(m, "\n");
 65         SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
 66                 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
 67                 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
 68                 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
 69                 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
 70 }
 71 
 72 static void
 73 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
 74                     u64 now)
 75 {
 76         struct hrtimer *timer, tmp;
 77         unsigned long next = 0, i;
 78         struct timerqueue_node *curr;
 79         unsigned long flags;
 80 
 81 next_one:
 82         i = 0;
 83 
 84         touch_nmi_watchdog();
 85 
 86         raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
 87 
 88         curr = timerqueue_getnext(&base->active);
 89         /*
 90          * Crude but we have to do this O(N*N) thing, because
 91          * we have to unlock the base when printing:
 92          */
 93         while (curr && i < next) {
 94                 curr = timerqueue_iterate_next(curr);
 95                 i++;
 96         }
 97 
 98         if (curr) {
 99 
100                 timer = container_of(curr, struct hrtimer, node);
101                 tmp = *timer;
102                 raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
103 
104                 print_timer(m, timer, &tmp, i, now);
105                 next++;
106                 goto next_one;
107         }
108         raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
109 }
110 
111 static void
112 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
113 {
114         SEQ_printf(m, "  .base:       %pK\n", base);
115         SEQ_printf(m, "  .index:      %d\n", base->index);
116 
117         SEQ_printf(m, "  .resolution: %u nsecs\n", hrtimer_resolution);
118 
119         SEQ_printf(m,   "  .get_time:   ");
120         print_name_offset(m, base->get_time);
121         SEQ_printf(m,   "\n");
122 #ifdef CONFIG_HIGH_RES_TIMERS
123         SEQ_printf(m, "  .offset:     %Lu nsecs\n",
124                    (unsigned long long) ktime_to_ns(base->offset));
125 #endif
126         SEQ_printf(m,   "active timers:\n");
127         print_active_timers(m, base, now + ktime_to_ns(base->offset));
128 }
129 
130 static void print_cpu(struct seq_file *m, int cpu, u64 now)
131 {
132         struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
133         int i;
134 
135         SEQ_printf(m, "cpu: %d\n", cpu);
136         for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
137                 SEQ_printf(m, " clock %d:\n", i);
138                 print_base(m, cpu_base->clock_base + i, now);
139         }
140 #define P(x) \
141         SEQ_printf(m, "  .%-15s: %Lu\n", #x, \
142                    (unsigned long long)(cpu_base->x))
143 #define P_ns(x) \
144         SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
145                    (unsigned long long)(ktime_to_ns(cpu_base->x)))
146 
147 #ifdef CONFIG_HIGH_RES_TIMERS
148         P_ns(expires_next);
149         P(hres_active);
150         P(nr_events);
151         P(nr_retries);
152         P(nr_hangs);
153         P(max_hang_time);
154 #endif
155 #undef P
156 #undef P_ns
157 
158 #ifdef CONFIG_TICK_ONESHOT
159 # define P(x) \
160         SEQ_printf(m, "  .%-15s: %Lu\n", #x, \
161                    (unsigned long long)(ts->x))
162 # define P_ns(x) \
163         SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
164                    (unsigned long long)(ktime_to_ns(ts->x)))
165         {
166                 struct tick_sched *ts = tick_get_tick_sched(cpu);
167                 P(nohz_mode);
168                 P_ns(last_tick);
169                 P(tick_stopped);
170                 P(idle_jiffies);
171                 P(idle_calls);
172                 P(idle_sleeps);
173                 P_ns(idle_entrytime);
174                 P_ns(idle_waketime);
175                 P_ns(idle_exittime);
176                 P_ns(idle_sleeptime);
177                 P_ns(iowait_sleeptime);
178                 P(last_jiffies);
179                 P(next_timer);
180                 P_ns(idle_expires);
181                 SEQ_printf(m, "jiffies: %Lu\n",
182                            (unsigned long long)jiffies);
183         }
184 #endif
185 
186 #undef P
187 #undef P_ns
188         SEQ_printf(m, "\n");
189 }
190 
191 #ifdef CONFIG_GENERIC_CLOCKEVENTS
192 static void
193 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
194 {
195         struct clock_event_device *dev = td->evtdev;
196 
197         touch_nmi_watchdog();
198 
199         SEQ_printf(m, "Tick Device: mode:     %d\n", td->mode);
200         if (cpu < 0)
201                 SEQ_printf(m, "Broadcast device\n");
202         else
203                 SEQ_printf(m, "Per CPU device: %d\n", cpu);
204 
205         SEQ_printf(m, "Clock Event Device: ");
206         if (!dev) {
207                 SEQ_printf(m, "<NULL>\n");
208                 return;
209         }
210         SEQ_printf(m, "%s\n", dev->name);
211         SEQ_printf(m, " max_delta_ns:   %llu\n",
212                    (unsigned long long) dev->max_delta_ns);
213         SEQ_printf(m, " min_delta_ns:   %llu\n",
214                    (unsigned long long) dev->min_delta_ns);
215         SEQ_printf(m, " mult:           %u\n", dev->mult);
216         SEQ_printf(m, " shift:          %u\n", dev->shift);
217         SEQ_printf(m, " mode:           %d\n", clockevent_get_state(dev));
218         SEQ_printf(m, " next_event:     %Ld nsecs\n",
219                    (unsigned long long) ktime_to_ns(dev->next_event));
220 
221         SEQ_printf(m, " set_next_event: ");
222         print_name_offset(m, dev->set_next_event);
223         SEQ_printf(m, "\n");
224 
225         if (dev->set_state_shutdown) {
226                 SEQ_printf(m, " shutdown: ");
227                 print_name_offset(m, dev->set_state_shutdown);
228                 SEQ_printf(m, "\n");
229         }
230 
231         if (dev->set_state_periodic) {
232                 SEQ_printf(m, " periodic: ");
233                 print_name_offset(m, dev->set_state_periodic);
234                 SEQ_printf(m, "\n");
235         }
236 
237         if (dev->set_state_oneshot) {
238                 SEQ_printf(m, " oneshot:  ");
239                 print_name_offset(m, dev->set_state_oneshot);
240                 SEQ_printf(m, "\n");
241         }
242 
243         if (dev->set_state_oneshot_stopped) {
244                 SEQ_printf(m, " oneshot stopped: ");
245                 print_name_offset(m, dev->set_state_oneshot_stopped);
246                 SEQ_printf(m, "\n");
247         }
248 
249         if (dev->tick_resume) {
250                 SEQ_printf(m, " resume:   ");
251                 print_name_offset(m, dev->tick_resume);
252                 SEQ_printf(m, "\n");
253         }
254 
255         SEQ_printf(m, " event_handler:  ");
256         print_name_offset(m, dev->event_handler);
257         SEQ_printf(m, "\n");
258         SEQ_printf(m, " retries:        %lu\n", dev->retries);
259         SEQ_printf(m, "\n");
260 }
261 
262 static void timer_list_show_tickdevices_header(struct seq_file *m)
263 {
264 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
265         print_tickdevice(m, tick_get_broadcast_device(), -1);
266         SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
267                    cpumask_pr_args(tick_get_broadcast_mask()));
268 #ifdef CONFIG_TICK_ONESHOT
269         SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
270                    cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
271 #endif
272         SEQ_printf(m, "\n");
273 #endif
274 }
275 #endif
276 
277 static inline void timer_list_header(struct seq_file *m, u64 now)
278 {
279         SEQ_printf(m, "Timer List Version: v0.8\n");
280         SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
281         SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
282         SEQ_printf(m, "\n");
283 }
284 
285 void sysrq_timer_list_show(void)
286 {
287         u64 now = ktime_to_ns(ktime_get());
288         int cpu;
289 
290         timer_list_header(NULL, now);
291 
292         for_each_online_cpu(cpu)
293                 print_cpu(NULL, cpu, now);
294 
295 #ifdef CONFIG_GENERIC_CLOCKEVENTS
296         timer_list_show_tickdevices_header(NULL);
297         for_each_online_cpu(cpu)
298                 print_tickdevice(NULL, tick_get_device(cpu), cpu);
299 #endif
300         return;
301 }
302 
303 #ifdef CONFIG_PROC_FS
304 static int timer_list_show(struct seq_file *m, void *v)
305 {
306         struct timer_list_iter *iter = v;
307 
308         if (iter->cpu == -1 && !iter->second_pass)
309                 timer_list_header(m, iter->now);
310         else if (!iter->second_pass)
311                 print_cpu(m, iter->cpu, iter->now);
312 #ifdef CONFIG_GENERIC_CLOCKEVENTS
313         else if (iter->cpu == -1 && iter->second_pass)
314                 timer_list_show_tickdevices_header(m);
315         else
316                 print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
317 #endif
318         return 0;
319 }
320 
321 static void *move_iter(struct timer_list_iter *iter, loff_t offset)
322 {
323         for (; offset; offset--) {
324                 iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
325                 if (iter->cpu >= nr_cpu_ids) {
326 #ifdef CONFIG_GENERIC_CLOCKEVENTS
327                         if (!iter->second_pass) {
328                                 iter->cpu = -1;
329                                 iter->second_pass = true;
330                         } else
331                                 return NULL;
332 #else
333                         return NULL;
334 #endif
335                 }
336         }
337         return iter;
338 }
339 
340 static void *timer_list_start(struct seq_file *file, loff_t *offset)
341 {
342         struct timer_list_iter *iter = file->private;
343 
344         if (!*offset)
345                 iter->now = ktime_to_ns(ktime_get());
346         iter->cpu = -1;
347         iter->second_pass = false;
348         return move_iter(iter, *offset);
349 }
350 
351 static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
352 {
353         struct timer_list_iter *iter = file->private;
354         ++*offset;
355         return move_iter(iter, 1);
356 }
357 
358 static void timer_list_stop(struct seq_file *seq, void *v)
359 {
360 }
361 
362 static const struct seq_operations timer_list_sops = {
363         .start = timer_list_start,
364         .next = timer_list_next,
365         .stop = timer_list_stop,
366         .show = timer_list_show,
367 };
368 
369 static int __init init_timer_list_procfs(void)
370 {
371         struct proc_dir_entry *pe;
372 
373         pe = proc_create_seq_private("timer_list", 0400, NULL, &timer_list_sops,
374                         sizeof(struct timer_list_iter), NULL);
375         if (!pe)
376                 return -ENOMEM;
377         return 0;
378 }
379 __initcall(init_timer_list_procfs);
380 #endif
381 

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