1 /*
2 * kernel/time/timer_list.c
3 *
4 * List pending timers
5 *
6 * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
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 typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
24
25 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
26
27 /*
28 * This allows printing both to /proc/timer_list and
29 * to the console (on SysRq-Q):
30 */
31 #define SEQ_printf(m, x...) \
32 do { \
33 if (m) \
34 seq_printf(m, x); \
35 else \
36 printk(x); \
37 } while (0)
38
39 static void print_name_offset(struct seq_file *m, void *sym)
40 {
41 char symname[KSYM_NAME_LEN];
42
43 if (lookup_symbol_name((unsigned long)sym, symname) < 0)
44 SEQ_printf(m, "<%p>", sym);
45 else
46 SEQ_printf(m, "%s", symname);
47 }
48
49 static void
50 print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
51 int idx, u64 now)
52 {
53 #ifdef CONFIG_TIMER_STATS
54 char tmp[TASK_COMM_LEN + 1];
55 #endif
56 SEQ_printf(m, " #%d: ", idx);
57 print_name_offset(m, taddr);
58 SEQ_printf(m, ", ");
59 print_name_offset(m, timer->function);
60 SEQ_printf(m, ", S:%02lx", timer->state);
61 #ifdef CONFIG_TIMER_STATS
62 SEQ_printf(m, ", ");
63 print_name_offset(m, timer->start_site);
64 memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
65 tmp[TASK_COMM_LEN] = 0;
66 SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
67 #endif
68 SEQ_printf(m, "\n");
69 SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
70 (unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
71 (unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
72 (long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
73 (long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
74 }
75
76 static void
77 print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
78 u64 now)
79 {
80 struct hrtimer *timer, tmp;
81 unsigned long next = 0, i;
82 struct rb_node *curr;
83 unsigned long flags;
84
85 next_one:
86 i = 0;
87 spin_lock_irqsave(&base->cpu_base->lock, flags);
88
89 curr = base->first;
90 /*
91 * Crude but we have to do this O(N*N) thing, because
92 * we have to unlock the base when printing:
93 */
94 while (curr && i < next) {
95 curr = rb_next(curr);
96 i++;
97 }
98
99 if (curr) {
100
101 timer = rb_entry(curr, struct hrtimer, node);
102 tmp = *timer;
103 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
104
105 print_timer(m, timer, &tmp, i, now);
106 next++;
107 goto next_one;
108 }
109 spin_unlock_irqrestore(&base->cpu_base->lock, flags);
110 }
111
112 static void
113 print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
114 {
115 SEQ_printf(m, " .base: %p\n", base);
116 SEQ_printf(m, " .index: %d\n",
117 base->index);
118 SEQ_printf(m, " .resolution: %Lu nsecs\n",
119 (unsigned long long)ktime_to_ns(base->resolution));
120 SEQ_printf(m, " .get_time: ");
121 print_name_offset(m, base->get_time);
122 SEQ_printf(m, "\n");
123 #ifdef CONFIG_HIGH_RES_TIMERS
124 SEQ_printf(m, " .offset: %Lu nsecs\n",
125 (unsigned long long) ktime_to_ns(base->offset));
126 #endif
127 SEQ_printf(m, "active timers:\n");
128 print_active_timers(m, base, now);
129 }
130
131 static void print_cpu(struct seq_file *m, int cpu, u64 now)
132 {
133 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
134 int i;
135
136 SEQ_printf(m, "\n");
137 SEQ_printf(m, "cpu: %d\n", cpu);
138 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
139 SEQ_printf(m, " clock %d:\n", i);
140 print_base(m, cpu_base->clock_base + i, now);
141 }
142 #define P(x) \
143 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
144 (unsigned long long)(cpu_base->x))
145 #define P_ns(x) \
146 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
147 (unsigned long long)(ktime_to_ns(cpu_base->x)))
148
149 #ifdef CONFIG_HIGH_RES_TIMERS
150 P_ns(expires_next);
151 P(hres_active);
152 P(nr_events);
153 #endif
154 #undef P
155 #undef P_ns
156
157 #ifdef CONFIG_TICK_ONESHOT
158 # define P(x) \
159 SEQ_printf(m, " .%-15s: %Lu\n", #x, \
160 (unsigned long long)(ts->x))
161 # define P_ns(x) \
162 SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
163 (unsigned long long)(ktime_to_ns(ts->x)))
164 {
165 struct tick_sched *ts = tick_get_tick_sched(cpu);
166 P(nohz_mode);
167 P_ns(idle_tick);
168 P(tick_stopped);
169 P(idle_jiffies);
170 P(idle_calls);
171 P(idle_sleeps);
172 P_ns(idle_entrytime);
173 P_ns(idle_waketime);
174 P_ns(idle_exittime);
175 P_ns(idle_sleeptime);
176 P(last_jiffies);
177 P(next_jiffies);
178 P_ns(idle_expires);
179 SEQ_printf(m, "jiffies: %Lu\n",
180 (unsigned long long)jiffies);
181 }
182 #endif
183
184 #undef P
185 #undef P_ns
186 }
187
188 #ifdef CONFIG_GENERIC_CLOCKEVENTS
189 static void
190 print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
191 {
192 struct clock_event_device *dev = td->evtdev;
193
194 SEQ_printf(m, "\n");
195 SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
196 if (cpu < 0)
197 SEQ_printf(m, "Broadcast device\n");
198 else
199 SEQ_printf(m, "Per CPU device: %d\n", cpu);
200
201 SEQ_printf(m, "Clock Event Device: ");
202 if (!dev) {
203 SEQ_printf(m, "<NULL>\n");
204 return;
205 }
206 SEQ_printf(m, "%s\n", dev->name);
207 SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns);
208 SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
209 SEQ_printf(m, " mult: %lu\n", dev->mult);
210 SEQ_printf(m, " shift: %d\n", dev->shift);
211 SEQ_printf(m, " mode: %d\n", dev->mode);
212 SEQ_printf(m, " next_event: %Ld nsecs\n",
213 (unsigned long long) ktime_to_ns(dev->next_event));
214
215 SEQ_printf(m, " set_next_event: ");
216 print_name_offset(m, dev->set_next_event);
217 SEQ_printf(m, "\n");
218
219 SEQ_printf(m, " set_mode: ");
220 print_name_offset(m, dev->set_mode);
221 SEQ_printf(m, "\n");
222
223 SEQ_printf(m, " event_handler: ");
224 print_name_offset(m, dev->event_handler);
225 SEQ_printf(m, "\n");
226 }
227
228 static void timer_list_show_tickdevices(struct seq_file *m)
229 {
230 int cpu;
231
232 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
233 print_tickdevice(m, tick_get_broadcast_device(), -1);
234 SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
235 tick_get_broadcast_mask()->bits[0]);
236 #ifdef CONFIG_TICK_ONESHOT
237 SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
238 tick_get_broadcast_oneshot_mask()->bits[0]);
239 #endif
240 SEQ_printf(m, "\n");
241 #endif
242 for_each_online_cpu(cpu)
243 print_tickdevice(m, tick_get_device(cpu), cpu);
244 SEQ_printf(m, "\n");
245 }
246 #else
247 static void timer_list_show_tickdevices(struct seq_file *m) { }
248 #endif
249
250 static int timer_list_show(struct seq_file *m, void *v)
251 {
252 u64 now = ktime_to_ns(ktime_get());
253 int cpu;
254
255 SEQ_printf(m, "Timer List Version: v0.4\n");
256 SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
257 SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
258
259 for_each_online_cpu(cpu)
260 print_cpu(m, cpu, now);
261
262 SEQ_printf(m, "\n");
263 timer_list_show_tickdevices(m);
264
265 return 0;
266 }
267
268 void sysrq_timer_list_show(void)
269 {
270 timer_list_show(NULL, NULL);
271 }
272
273 static int timer_list_open(struct inode *inode, struct file *filp)
274 {
275 return single_open(filp, timer_list_show, NULL);
276 }
277
278 static struct file_operations timer_list_fops = {
279 .open = timer_list_open,
280 .read = seq_read,
281 .llseek = seq_lseek,
282 .release = single_release,
283 };
284
285 static int __init init_timer_list_procfs(void)
286 {
287 struct proc_dir_entry *pe;
288
289 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
290 if (!pe)
291 return -ENOMEM;
292 return 0;
293 }
294 __initcall(init_timer_list_procfs);
295
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