[mirror_ubuntu-zesty-kernel.git] / kernel / time / timer_list.c

/*
 * kernel/time/timer_list.c
 *
 * List pending timers
 *
 * Copyright(C) 2006, Red Hat, Inc., Ingo Molnar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/proc_fs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/tick.h>

#include <asm/uaccess.h>

typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);

DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);

/*
 * This allows printing both to /proc/timer_list and
 * to the console (on SysRq-Q):
 */
#define SEQ_printf(m, x...)			\
 do {						\
	if (m)					\
		seq_printf(m, x);		\
	else					\
		printk(x);			\
 } while (0)

static void print_name_offset(struct seq_file *m, void *sym)
{
	char symname[KSYM_NAME_LEN+1];

	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
		SEQ_printf(m, "<%p>", sym);
	else
		SEQ_printf(m, "%s", symname);
}

static void
print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
{
#ifdef CONFIG_TIMER_STATS
	char tmp[TASK_COMM_LEN + 1];
#endif
	SEQ_printf(m, " #%d: ", idx);
	print_name_offset(m, timer);
	SEQ_printf(m, ", ");
	print_name_offset(m, timer->function);
	SEQ_printf(m, ", S:%02lx", timer->state);
#ifdef CONFIG_TIMER_STATS
	SEQ_printf(m, ", ");
	print_name_offset(m, timer->start_site);
	memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
	tmp[TASK_COMM_LEN] = 0;
	SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
#endif
	SEQ_printf(m, "\n");
	SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n",
		(unsigned long long)ktime_to_ns(timer->expires),
		(unsigned long long)(ktime_to_ns(timer->expires) - now));
}

static void
print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
		    u64 now)
{
	struct hrtimer *timer, tmp;
	unsigned long next = 0, i;
	struct rb_node *curr;
	unsigned long flags;

next_one:
	i = 0;
	spin_lock_irqsave(&base->cpu_base->lock, flags);

	curr = base->first;
	/*
	 * Crude but we have to do this O(N*N) thing, because
	 * we have to unlock the base when printing:
	 */
	while (curr && i < next) {
		curr = rb_next(curr);
		i++;
	}

	if (curr) {

		timer = rb_entry(curr, struct hrtimer, node);
		tmp = *timer;
		spin_unlock_irqrestore(&base->cpu_base->lock, flags);

		print_timer(m, &tmp, i, now);
		next++;
		goto next_one;
	}
	spin_unlock_irqrestore(&base->cpu_base->lock, flags);
}

static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
	SEQ_printf(m, "  .index:      %d\n",
			base->index);
	SEQ_printf(m, "  .resolution: %Ld nsecs\n",
			(unsigned long long)ktime_to_ns(base->resolution));
	SEQ_printf(m,   "  .get_time:   ");
	print_name_offset(m, base->get_time);
	SEQ_printf(m,   "\n");
#ifdef CONFIG_HIGH_RES_TIMERS
	SEQ_printf(m, "  .offset:     %Ld nsecs\n",
			ktime_to_ns(base->offset));
#endif
	SEQ_printf(m,   "active timers:\n");
	print_active_timers(m, base, now);
}

static void print_cpu(struct seq_file *m, int cpu, u64 now)
{
	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
	int i;

	SEQ_printf(m, "\ncpu: %d\n", cpu);
	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
		SEQ_printf(m, " clock %d:\n", i);
		print_base(m, cpu_base->clock_base + i, now);
	}
#define P(x) \
	SEQ_printf(m, "  .%-15s: %Ld\n", #x, (u64)(cpu_base->x))
#define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Ld nsecs\n", #x, \
		(u64)(ktime_to_ns(cpu_base->x)))

#ifdef CONFIG_HIGH_RES_TIMERS
	P_ns(expires_next);
	P(hres_active);
	P(nr_events);
#endif
#undef P
#undef P_ns

#ifdef CONFIG_TICK_ONESHOT
# define P(x) \
	SEQ_printf(m, "  .%-15s: %Ld\n", #x, (u64)(ts->x))
# define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Ld nsecs\n", #x, \
		(u64)(ktime_to_ns(ts->x)))
	{
		struct tick_sched *ts = tick_get_tick_sched(cpu);
		P(nohz_mode);
		P_ns(idle_tick);
		P(tick_stopped);
		P(idle_jiffies);
		P(idle_calls);
		P(idle_sleeps);
		P_ns(idle_entrytime);
		P_ns(idle_sleeptime);
		P(last_jiffies);
		P(next_jiffies);
		P_ns(idle_expires);
		SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies);
	}
#endif

#undef P
#undef P_ns
}

#ifdef CONFIG_GENERIC_CLOCKEVENTS
static void
print_tickdevice(struct seq_file *m, struct tick_device *td)
{
	struct clock_event_device *dev = td->evtdev;

	SEQ_printf(m, "\nTick Device: mode:     %d\n", td->mode);

	SEQ_printf(m, "Clock Event Device: ");
	if (!dev) {
		SEQ_printf(m, "<NULL>\n");
		return;
	}
	SEQ_printf(m, "%s\n", dev->name);
	SEQ_printf(m, " max_delta_ns:   %lu\n", dev->max_delta_ns);
	SEQ_printf(m, " min_delta_ns:   %lu\n", dev->min_delta_ns);
	SEQ_printf(m, " mult:           %lu\n", dev->mult);
	SEQ_printf(m, " shift:          %d\n", dev->shift);
	SEQ_printf(m, " mode:           %d\n", dev->mode);
	SEQ_printf(m, " next_event:     %Ld nsecs\n",
		   (unsigned long long) ktime_to_ns(dev->next_event));

	SEQ_printf(m, " set_next_event: ");
	print_name_offset(m, dev->set_next_event);
	SEQ_printf(m, "\n");

	SEQ_printf(m, " set_mode:       ");
	print_name_offset(m, dev->set_mode);
	SEQ_printf(m, "\n");

	SEQ_printf(m, " event_handler:  ");
	print_name_offset(m, dev->event_handler);
	SEQ_printf(m, "\n");
}

static void timer_list_show_tickdevices(struct seq_file *m)
{
	int cpu;

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
	print_tickdevice(m, tick_get_broadcast_device());
	SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
		   tick_get_broadcast_mask()->bits[0]);
#ifdef CONFIG_TICK_ONESHOT
	SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
		   tick_get_broadcast_oneshot_mask()->bits[0]);
#endif
	SEQ_printf(m, "\n");
#endif
	for_each_online_cpu(cpu)
		   print_tickdevice(m, tick_get_device(cpu));
	SEQ_printf(m, "\n");
}
#else
static void timer_list_show_tickdevices(struct seq_file *m) { }
#endif

static int timer_list_show(struct seq_file *m, void *v)
{
	u64 now = ktime_to_ns(ktime_get());
	int cpu;

	SEQ_printf(m, "Timer List Version: v0.3\n");
	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);

	for_each_online_cpu(cpu)
		print_cpu(m, cpu, now);

	SEQ_printf(m, "\n");
	timer_list_show_tickdevices(m);

	return 0;
}

void sysrq_timer_list_show(void)
{
	timer_list_show(NULL, NULL);
}

static int timer_list_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, timer_list_show, NULL);
}

static struct file_operations timer_list_fops = {
	.open		= timer_list_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init init_timer_list_procfs(void)
{
	struct proc_dir_entry *pe;

	pe = create_proc_entry("timer_list", 0644, NULL);
	if (!pe)
		return -ENOMEM;

	pe->proc_fops = &timer_list_fops;

	return 0;
}
__initcall(init_timer_list_procfs);
Commit	Line	Data
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	{
9d65cb4a	41	char symname[KSYM_NAME_LEN+1];
289f480a	42
9d65cb4a	43	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
289f480a	44	SEQ_printf(m, "<%p>", sym);
9d65cb4a AD	45	else
9d65cb4a AD	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");
	68	SEQ_printf(m, " # expires at %Ld nsecs [in %Ld nsecs]\n",
	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);
114	SEQ_printf(m, " .resolution: %Ld nsecs\n",
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
120	SEQ_printf(m, " .offset: %Ld nsecs\n",
121	ktime_to_ns(base->offset));
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) \
138	SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(cpu_base->x))
139	#define P_ns(x) \
140	SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
141	(u64)(ktime_to_ns(cpu_base->x)))
142
143	#ifdef CONFIG_HIGH_RES_TIMERS
144	P_ns(expires_next);
145	P(hres_active);
146	P(nr_events);
147	#endif
148	#undef P
149	#undef P_ns
150
151	#ifdef CONFIG_TICK_ONESHOT
152	# define P(x) \
153	SEQ_printf(m, " .%-15s: %Ld\n", #x, (u64)(ts->x))
154	# define P_ns(x) \
155	SEQ_printf(m, " .%-15s: %Ld nsecs\n", #x, \
156	(u64)(ktime_to_ns(ts->x)))
157	{
158	struct tick_sched *ts = tick_get_tick_sched(cpu);
159	P(nohz_mode);
160	P_ns(idle_tick);
161	P(tick_stopped);
162	P(idle_jiffies);
163	P(idle_calls);
164	P(idle_sleeps);
165	P_ns(idle_entrytime);
166	P_ns(idle_sleeptime);
167	P(last_jiffies);
168	P(next_jiffies);
169	P_ns(idle_expires);
170	SEQ_printf(m, "jiffies: %Ld\n", (u64)jiffies);
171	}
172	#endif
173
174	#undef P
175	#undef P_ns
176	}
177
178	#ifdef CONFIG_GENERIC_CLOCKEVENTS
179	static void
180	print_tickdevice(struct seq_file m, struct tick_device td)
181	{
182	struct clock_event_device *dev = td->evtdev;
183
184	SEQ_printf(m, "\nTick Device: mode: %d\n", td->mode);
185
186	SEQ_printf(m, "Clock Event Device: ");
187	if (!dev) {
188	SEQ_printf(m, "<NULL>\n");
189	return;
190	}
191	SEQ_printf(m, "%s\n", dev->name);
0444b303 JM	192	SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns);
	193	SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns);
	194	SEQ_printf(m, " mult: %lu\n", dev->mult);
289f480a IM	195	SEQ_printf(m, " shift: %d\n", dev->shift);
	196	SEQ_printf(m, " mode: %d\n", dev->mode);
	197	SEQ_printf(m, " next_event: %Ld nsecs\n",
	198	(unsigned long long) ktime_to_ns(dev->next_event));
	199
	200	SEQ_printf(m, " set_next_event: ");
	201	print_name_offset(m, dev->set_next_event);
	202	SEQ_printf(m, "\n");
	203
	204	SEQ_printf(m, " set_mode: ");
	205	print_name_offset(m, dev->set_mode);
	206	SEQ_printf(m, "\n");
	207
	208	SEQ_printf(m, " event_handler: ");
	209	print_name_offset(m, dev->event_handler);
	210	SEQ_printf(m, "\n");
	211	}
	212
	213	static void timer_list_show_tickdevices(struct seq_file *m)
	214	{
	215	int cpu;
	216
	217	#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
	218	print_tickdevice(m, tick_get_broadcast_device());
	219	SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
	220	tick_get_broadcast_mask()->bits[0]);
	221	#ifdef CONFIG_TICK_ONESHOT
	222	SEQ_printf(m, "tick_broadcast_oneshot_mask: %08lx\n",
	223	tick_get_broadcast_oneshot_mask()->bits[0]);
	224	#endif
	225	SEQ_printf(m, "\n");
	226	#endif
	227	for_each_online_cpu(cpu)
	228	print_tickdevice(m, tick_get_device(cpu));
	229	SEQ_printf(m, "\n");
	230	}
	231	#else
	232	static void timer_list_show_tickdevices(struct seq_file *m) { }
	233	#endif
	234
	235	static int timer_list_show(struct seq_file m, void v)
	236	{
	237	u64 now = ktime_to_ns(ktime_get());
	238	int cpu;
	239
	240	SEQ_printf(m, "Timer List Version: v0.3\n");
	241	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
	242	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
	243
	244	for_each_online_cpu(cpu)
	245	print_cpu(m, cpu, now);
	246
	247	SEQ_printf(m, "\n");
	248	timer_list_show_tickdevices(m);
	249
	250	return 0;
	251	}
	252
	253	void sysrq_timer_list_show(void)
	254	{
	255	timer_list_show(NULL, NULL);
	256	}
	257
	258	static int timer_list_open(struct inode inode, struct file filp)
259	{
260	return single_open(filp, timer_list_show, NULL);
261	}
262
263	static struct file_operations timer_list_fops = {
264	.open = timer_list_open,
265	.read = seq_read,
266	.llseek = seq_lseek,
267	.release = seq_release,
268	};
269
270	static int __init init_timer_list_procfs(void)
271	{
272	struct proc_dir_entry *pe;
273
274	pe = create_proc_entry("timer_list", 0644, NULL);
275	if (!pe)
276	return -ENOMEM;
277
278	pe->proc_fops = &timer_list_fops;
279
280	return 0;
281	}
282	__initcall(init_timer_list_procfs);