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289f480a IM |
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 | { | |
9281acea | 41 | char symname[KSYM_NAME_LEN]; |
289f480a | 42 | |
9d65cb4a | 43 | if (lookup_symbol_name((unsigned long)sym, symname) < 0) |
289f480a | 44 | SEQ_printf(m, "<%p>", sym); |
9d65cb4a AD |
45 | else |
46 | SEQ_printf(m, "%s", symname); | |
289f480a IM |
47 | } |
48 | ||
49 | static void | |
50 | print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now) | |
51 | { | |
52 | #ifdef CONFIG_TIMER_STATS | |
53 | char tmp[TASK_COMM_LEN + 1]; | |
54 | #endif | |
55 | SEQ_printf(m, " #%d: ", idx); | |
56 | print_name_offset(m, timer); | |
57 | SEQ_printf(m, ", "); | |
58 | print_name_offset(m, timer->function); | |
59 | SEQ_printf(m, ", S:%02lx", timer->state); | |
60 | #ifdef CONFIG_TIMER_STATS | |
61 | SEQ_printf(m, ", "); | |
62 | print_name_offset(m, timer->start_site); | |
63 | memcpy(tmp, timer->start_comm, TASK_COMM_LEN); | |
64 | tmp[TASK_COMM_LEN] = 0; | |
65 | SEQ_printf(m, ", %s/%d", tmp, timer->start_pid); | |
66 | #endif | |
67 | SEQ_printf(m, "\n"); | |
9b04bd27 | 68 | SEQ_printf(m, " # expires at %Lu nsecs [in %Lu nsecs]\n", |
289f480a IM |
69 | (unsigned long long)ktime_to_ns(timer->expires), |
70 | (unsigned long long)(ktime_to_ns(timer->expires) - now)); | |
71 | } | |
72 | ||
73 | static void | |
74 | print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, | |
75 | u64 now) | |
76 | { | |
77 | struct hrtimer *timer, tmp; | |
78 | unsigned long next = 0, i; | |
79 | struct rb_node *curr; | |
80 | unsigned long flags; | |
81 | ||
82 | next_one: | |
83 | i = 0; | |
84 | spin_lock_irqsave(&base->cpu_base->lock, flags); | |
85 | ||
86 | curr = base->first; | |
87 | /* | |
88 | * Crude but we have to do this O(N*N) thing, because | |
89 | * we have to unlock the base when printing: | |
90 | */ | |
91 | while (curr && i < next) { | |
92 | curr = rb_next(curr); | |
93 | i++; | |
94 | } | |
95 | ||
96 | if (curr) { | |
97 | ||
98 | timer = rb_entry(curr, struct hrtimer, node); | |
99 | tmp = *timer; | |
100 | spin_unlock_irqrestore(&base->cpu_base->lock, flags); | |
101 | ||
102 | print_timer(m, &tmp, i, now); | |
103 | next++; | |
104 | goto next_one; | |
105 | } | |
106 | spin_unlock_irqrestore(&base->cpu_base->lock, flags); | |
107 | } | |
108 | ||
109 | static void | |
110 | print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) | |
111 | { | |
112 | SEQ_printf(m, " .index: %d\n", | |
113 | base->index); | |
9b04bd27 | 114 | SEQ_printf(m, " .resolution: %Lu nsecs\n", |
289f480a IM |
115 | (unsigned long long)ktime_to_ns(base->resolution)); |
116 | SEQ_printf(m, " .get_time: "); | |
117 | print_name_offset(m, base->get_time); | |
118 | SEQ_printf(m, "\n"); | |
119 | #ifdef CONFIG_HIGH_RES_TIMERS | |
9b04bd27 DM |
120 | SEQ_printf(m, " .offset: %Lu nsecs\n", |
121 | (unsigned long long) ktime_to_ns(base->offset)); | |
289f480a IM |
122 | #endif |
123 | SEQ_printf(m, "active timers:\n"); | |
124 | print_active_timers(m, base, now); | |
125 | } | |
126 | ||
127 | static void print_cpu(struct seq_file *m, int cpu, u64 now) | |
128 | { | |
129 | struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); | |
130 | int i; | |
131 | ||
132 | SEQ_printf(m, "\ncpu: %d\n", cpu); | |
133 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { | |
134 | SEQ_printf(m, " clock %d:\n", i); | |
135 | print_base(m, cpu_base->clock_base + i, now); | |
136 | } | |
137 | #define P(x) \ | |
9b04bd27 DM |
138 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
139 | (unsigned long long)(cpu_base->x)) | |
289f480a | 140 | #define P_ns(x) \ |
9b04bd27 DM |
141 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
142 | (unsigned long long)(ktime_to_ns(cpu_base->x))) | |
289f480a IM |
143 | |
144 | #ifdef CONFIG_HIGH_RES_TIMERS | |
145 | P_ns(expires_next); | |
146 | P(hres_active); | |
147 | P(nr_events); | |
148 | #endif | |
149 | #undef P | |
150 | #undef P_ns | |
151 | ||
152 | #ifdef CONFIG_TICK_ONESHOT | |
153 | # define P(x) \ | |
9b04bd27 DM |
154 | SEQ_printf(m, " .%-15s: %Lu\n", #x, \ |
155 | (unsigned long long)(ts->x)) | |
289f480a | 156 | # define P_ns(x) \ |
9b04bd27 DM |
157 | SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \ |
158 | (unsigned long long)(ktime_to_ns(ts->x))) | |
289f480a IM |
159 | { |
160 | struct tick_sched *ts = tick_get_tick_sched(cpu); | |
161 | P(nohz_mode); | |
162 | P_ns(idle_tick); | |
163 | P(tick_stopped); | |
164 | P(idle_jiffies); | |
165 | P(idle_calls); | |
166 | P(idle_sleeps); | |
167 | P_ns(idle_entrytime); | |
168 | P_ns(idle_sleeptime); | |
169 | P(last_jiffies); | |
170 | P(next_jiffies); | |
171 | P_ns(idle_expires); | |
9b04bd27 DM |
172 | SEQ_printf(m, "jiffies: %Lu\n", |
173 | (unsigned long long)jiffies); | |
289f480a IM |
174 | } |
175 | #endif | |
176 | ||
177 | #undef P | |
178 | #undef P_ns | |
179 | } | |
180 | ||
181 | #ifdef CONFIG_GENERIC_CLOCKEVENTS | |
182 | static void | |
183 | print_tickdevice(struct seq_file *m, struct tick_device *td) | |
184 | { | |
185 | struct clock_event_device *dev = td->evtdev; | |
186 | ||
187 | SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode); | |
188 | ||
189 | SEQ_printf(m, "Clock Event Device: "); | |
190 | if (!dev) { | |
191 | SEQ_printf(m, "<NULL>\n"); | |
192 | return; | |
193 | } | |
194 | SEQ_printf(m, "%s\n", dev->name); | |
0444b303 JM |
195 | SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns); |
196 | SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns); | |
197 | SEQ_printf(m, " mult: %lu\n", dev->mult); | |
289f480a IM |
198 | SEQ_printf(m, " shift: %d\n", dev->shift); |
199 | SEQ_printf(m, " mode: %d\n", dev->mode); | |
200 | SEQ_printf(m, " next_event: %Ld nsecs\n", | |
201 | (unsigned long long) ktime_to_ns(dev->next_event)); | |
202 | ||
203 | SEQ_printf(m, " set_next_event: "); | |
204 | print_name_offset(m, dev->set_next_event); | |
205 | SEQ_printf(m, "\n"); | |
206 | ||
207 | SEQ_printf(m, " set_mode: "); | |
208 | print_name_offset(m, dev->set_mode); | |
209 | SEQ_printf(m, "\n"); | |
210 | ||
211 | SEQ_printf(m, " event_handler: "); | |
212 | print_name_offset(m, dev->event_handler); | |
213 | SEQ_printf(m, "\n"); | |
214 | } | |
215 | ||
216 | static void timer_list_show_tickdevices(struct seq_file *m) | |
217 | { | |
218 | int cpu; | |
219 | ||
220 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST | |
221 | print_tickdevice(m, tick_get_broadcast_device()); | |
222 | SEQ_printf(m, "tick_broadcast_mask: %08lx\n", | |
223 | tick_get_broadcast_mask()->bits[0]); | |
224 | #ifdef CONFIG_TICK_ONESHOT | |
225 | SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n", | |
226 | tick_get_broadcast_oneshot_mask()->bits[0]); | |
227 | #endif | |
228 | SEQ_printf(m, "\n"); | |
229 | #endif | |
230 | for_each_online_cpu(cpu) | |
231 | print_tickdevice(m, tick_get_device(cpu)); | |
232 | SEQ_printf(m, "\n"); | |
233 | } | |
234 | #else | |
235 | static void timer_list_show_tickdevices(struct seq_file *m) { } | |
236 | #endif | |
237 | ||
238 | static int timer_list_show(struct seq_file *m, void *v) | |
239 | { | |
240 | u64 now = ktime_to_ns(ktime_get()); | |
241 | int cpu; | |
242 | ||
243 | SEQ_printf(m, "Timer List Version: v0.3\n"); | |
244 | SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES); | |
245 | SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now); | |
246 | ||
247 | for_each_online_cpu(cpu) | |
248 | print_cpu(m, cpu, now); | |
249 | ||
250 | SEQ_printf(m, "\n"); | |
251 | timer_list_show_tickdevices(m); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | void sysrq_timer_list_show(void) | |
257 | { | |
258 | timer_list_show(NULL, NULL); | |
259 | } | |
260 | ||
261 | static int timer_list_open(struct inode *inode, struct file *filp) | |
262 | { | |
263 | return single_open(filp, timer_list_show, NULL); | |
264 | } | |
265 | ||
266 | static struct file_operations timer_list_fops = { | |
267 | .open = timer_list_open, | |
268 | .read = seq_read, | |
269 | .llseek = seq_lseek, | |
270 | .release = seq_release, | |
271 | }; | |
272 | ||
273 | static int __init init_timer_list_procfs(void) | |
274 | { | |
275 | struct proc_dir_entry *pe; | |
276 | ||
277 | pe = create_proc_entry("timer_list", 0644, NULL); | |
278 | if (!pe) | |
279 | return -ENOMEM; | |
280 | ||
281 | pe->proc_fops = &timer_list_fops; | |
282 | ||
283 | return 0; | |
284 | } | |
285 | __initcall(init_timer_list_procfs); |