clocksource: Cleanup clocksource selection
[linux-2.6.git] / kernel / time / timer_list.c
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", 0644, NULL, &timer_list_fops);
290         if (!pe)
291                 return -ENOMEM;
292         return 0;
293 }
294 __initcall(init_timer_list_procfs);