[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/uaccess.h>

#include "tick-internal.h"

struct timer_list_iter {
	int cpu;
	bool second_pass;
	u64 now;
};

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

/*
 * This allows printing both to /proc/timer_list and
 * to the console (on SysRq-Q):
 */
__printf(2, 3)
static void SEQ_printf(struct seq_file *m, const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);

	if (m)
		seq_vprintf(m, fmt, args);
	else
		vprintk(fmt, args);

	va_end(args);
}

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

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

static void
print_timer(struct seq_file *m, struct hrtimer *taddr, 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, taddr);
	SEQ_printf(m, ", ");
	print_name_offset(m, timer->function);
	SEQ_printf(m, ", S:%02x", 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 %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
		(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
		(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
		(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
		(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - 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 timerqueue_node *curr;
	unsigned long flags;

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

	curr = timerqueue_getnext(&base->active);
	/*
	 * 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 = timerqueue_iterate_next(curr);
		i++;
	}

	if (curr) {

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

		print_timer(m, timer, &tmp, i, now);
		next++;
		goto next_one;
	}
	raw_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, "  .base:       %pK\n", base);
	SEQ_printf(m, "  .index:      %d\n", base->index);

	SEQ_printf(m, "  .resolution: %u nsecs\n", (unsigned) hrtimer_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:     %Lu nsecs\n",
		   (unsigned long long) ktime_to_ns(base->offset));
#endif
	SEQ_printf(m,   "active timers:\n");
	print_active_timers(m, base, now + ktime_to_ns(base->offset));
}

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, "cpu: %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: %Lu\n", #x, \
		   (unsigned long long)(cpu_base->x))
#define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
		   (unsigned long long)(ktime_to_ns(cpu_base->x)))

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

#ifdef CONFIG_TICK_ONESHOT
# define P(x) \
	SEQ_printf(m, "  .%-15s: %Lu\n", #x, \
		   (unsigned long long)(ts->x))
# define P_ns(x) \
	SEQ_printf(m, "  .%-15s: %Lu nsecs\n", #x, \
		   (unsigned long long)(ktime_to_ns(ts->x)))
	{
		struct tick_sched *ts = tick_get_tick_sched(cpu);
		P(nohz_mode);
		P_ns(last_tick);
		P(tick_stopped);
		P(idle_jiffies);
		P(idle_calls);
		P(idle_sleeps);
		P_ns(idle_entrytime);
		P_ns(idle_waketime);
		P_ns(idle_exittime);
		P_ns(idle_sleeptime);
		P_ns(iowait_sleeptime);
		P(last_jiffies);
		P(next_timer);
		P_ns(idle_expires);
		SEQ_printf(m, "jiffies: %Lu\n",
			   (unsigned long long)jiffies);
	}
#endif

#undef P
#undef P_ns
	SEQ_printf(m, "\n");
}

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

	SEQ_printf(m, "Tick Device: mode:     %d\n", td->mode);
	if (cpu < 0)
		SEQ_printf(m, "Broadcast device\n");
	else
		SEQ_printf(m, "Per CPU device: %d\n", cpu);

	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:   %llu\n",
		   (unsigned long long) dev->max_delta_ns);
	SEQ_printf(m, " min_delta_ns:   %llu\n",
		   (unsigned long long) dev->min_delta_ns);
	SEQ_printf(m, " mult:           %u\n", dev->mult);
	SEQ_printf(m, " shift:          %u\n", dev->shift);
	SEQ_printf(m, " mode:           %d\n", clockevent_get_state(dev));
	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");

	if (dev->set_state_shutdown) {
		SEQ_printf(m, " shutdown: ");
		print_name_offset(m, dev->set_state_shutdown);
		SEQ_printf(m, "\n");
	}

	if (dev->set_state_periodic) {
		SEQ_printf(m, " periodic: ");
		print_name_offset(m, dev->set_state_periodic);
		SEQ_printf(m, "\n");
	}

	if (dev->set_state_oneshot) {
		SEQ_printf(m, " oneshot:  ");
		print_name_offset(m, dev->set_state_oneshot);
		SEQ_printf(m, "\n");
	}

	if (dev->set_state_oneshot_stopped) {
		SEQ_printf(m, " oneshot stopped: ");
		print_name_offset(m, dev->set_state_oneshot_stopped);
		SEQ_printf(m, "\n");
	}

	if (dev->tick_resume) {
		SEQ_printf(m, " resume:   ");
		print_name_offset(m, dev->tick_resume);
		SEQ_printf(m, "\n");
	}

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

static void timer_list_show_tickdevices_header(struct seq_file *m)
{
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
	print_tickdevice(m, tick_get_broadcast_device(), -1);
	SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
		   cpumask_pr_args(tick_get_broadcast_mask()));
#ifdef CONFIG_TICK_ONESHOT
	SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
		   cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
#endif
	SEQ_printf(m, "\n");
#endif
}
#endif

static inline void timer_list_header(struct seq_file *m, u64 now)
{
	SEQ_printf(m, "Timer List Version: v0.8\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);
	SEQ_printf(m, "\n");
}

static int timer_list_show(struct seq_file *m, void *v)
{
	struct timer_list_iter *iter = v;

	if (iter->cpu == -1 && !iter->second_pass)
		timer_list_header(m, iter->now);
	else if (!iter->second_pass)
		print_cpu(m, iter->cpu, iter->now);
#ifdef CONFIG_GENERIC_CLOCKEVENTS
	else if (iter->cpu == -1 && iter->second_pass)
		timer_list_show_tickdevices_header(m);
	else
		print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
#endif
	return 0;
}

void sysrq_timer_list_show(void)
{
	u64 now = ktime_to_ns(ktime_get());
	int cpu;

	timer_list_header(NULL, now);

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

#ifdef CONFIG_GENERIC_CLOCKEVENTS
	timer_list_show_tickdevices_header(NULL);
	for_each_online_cpu(cpu)
		print_tickdevice(NULL, tick_get_device(cpu), cpu);
#endif
	return;
}

static void *move_iter(struct timer_list_iter *iter, loff_t offset)
{
	for (; offset; offset--) {
		iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
		if (iter->cpu >= nr_cpu_ids) {
#ifdef CONFIG_GENERIC_CLOCKEVENTS
			if (!iter->second_pass) {
				iter->cpu = -1;
				iter->second_pass = true;
			} else
				return NULL;
#else
			return NULL;
#endif
		}
	}
	return iter;
}

static void *timer_list_start(struct seq_file *file, loff_t *offset)
{
	struct timer_list_iter *iter = file->private;

	if (!*offset)
		iter->now = ktime_to_ns(ktime_get());
	iter->cpu = -1;
	iter->second_pass = false;
	return move_iter(iter, *offset);
}

static void *timer_list_next(struct seq_file *file, void *v, loff_t *offset)
{
	struct timer_list_iter *iter = file->private;
	++*offset;
	return move_iter(iter, 1);
}

static void timer_list_stop(struct seq_file *seq, void *v)
{
}

static const struct seq_operations timer_list_sops = {
	.start = timer_list_start,
	.next = timer_list_next,
	.stop = timer_list_stop,
	.show = timer_list_show,
};

static int timer_list_open(struct inode *inode, struct file *filp)
{
	return seq_open_private(filp, &timer_list_sops,
			sizeof(struct timer_list_iter));
}

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

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

	pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
	if (!pe)
		return -ENOMEM;
	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>
289f480a	19
7c0f6ba6	20	#include <linux/uaccess.h>
289f480a	21
c1797baf	22	#include "tick-internal.h"
b3956a89 NZ	23
	24	struct timer_list_iter {
	25	int cpu;
	26	bool second_pass;
	27	u64 now;
	28	};
	29
289f480a IM	30	typedef void (print_fn_t)(struct seq_file m, unsigned int *classes);
289f480a IM	31
289f480a IM	32	/*
	33	* This allows printing both to /proc/timer_list and
	34	* to the console (on SysRq-Q):
	35	*/
7de4e744 JP	36	__printf(2, 3)
	37	static void SEQ_printf(struct seq_file m, const char fmt, ...)
	38	{
	39	va_list args;
	40
	41	va_start(args, fmt);
	42
	43	if (m)
	44	seq_vprintf(m, fmt, args);
	45	else
	46	vprintk(fmt, args);
	47
	48	va_end(args);
	49	}
289f480a IM	50
	51	static void print_name_offset(struct seq_file m, void sym)
	52	{
9281acea	53	char symname[KSYM_NAME_LEN];
289f480a	54
9d65cb4a	55	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
f5903085	56	SEQ_printf(m, "<%pK>", sym);
9d65cb4a AD	57	else
9d65cb4a AD	58	SEQ_printf(m, "%s", symname);
289f480a IM	59	}
	60
	61	static void
e67ef25a TG	62	print_timer(struct seq_file m, struct hrtimer taddr, struct hrtimer *timer,
e67ef25a TG	63	int idx, u64 now)
289f480a IM	64	{
	65	#ifdef CONFIG_TIMER_STATS
	66	char tmp[TASK_COMM_LEN + 1];
	67	#endif
	68	SEQ_printf(m, " #%d: ", idx);
e67ef25a	69	print_name_offset(m, taddr);
289f480a IM	70	SEQ_printf(m, ", ");
289f480a IM	71	print_name_offset(m, timer->function);
203cbf77	72	SEQ_printf(m, ", S:%02x", timer->state);
289f480a IM	73	#ifdef CONFIG_TIMER_STATS
	74	SEQ_printf(m, ", ");
	75	print_name_offset(m, timer->start_site);
	76	memcpy(tmp, timer->start_comm, TASK_COMM_LEN);
	77	tmp[TASK_COMM_LEN] = 0;
	78	SEQ_printf(m, ", %s/%d", tmp, timer->start_pid);
	79	#endif
	80	SEQ_printf(m, "\n");
704af52b AV	81	SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
704af52b AV	82	(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
cc584b21	83	(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
704af52b	84	(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
cc584b21	85	(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
289f480a IM	86	}
	87
	88	static void
	89	print_active_timers(struct seq_file m, struct hrtimer_clock_base base,
	90	u64 now)
	91	{
	92	struct hrtimer *timer, tmp;
	93	unsigned long next = 0, i;
998adc3d	94	struct timerqueue_node *curr;
289f480a IM	95	unsigned long flags;
	96
	97	next_one:
	98	i = 0;
ecb49d1a	99	raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
289f480a	100
998adc3d	101	curr = timerqueue_getnext(&base->active);
289f480a IM	102	/*
	103	* Crude but we have to do this O(N*N) thing, because
	104	* we have to unlock the base when printing:
	105	*/
	106	while (curr && i < next) {
998adc3d	107	curr = timerqueue_iterate_next(curr);
289f480a IM	108	i++;
	109	}
	110
	111	if (curr) {
	112
998adc3d	113	timer = container_of(curr, struct hrtimer, node);
289f480a	114	tmp = *timer;
ecb49d1a	115	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a	116
e67ef25a	117	print_timer(m, timer, &tmp, i, now);
289f480a IM	118	next++;
	119	goto next_one;
	120	}
ecb49d1a	121	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a IM	122	}
	123
	124	static void
	125	print_base(struct seq_file m, struct hrtimer_clock_base base, u64 now)
	126	{
f5903085	127	SEQ_printf(m, " .base: %pK\n", base);
398ca17f TG	128	SEQ_printf(m, " .index: %d\n", base->index);
	129
	130	SEQ_printf(m, " .resolution: %u nsecs\n", (unsigned) hrtimer_resolution);
	131
289f480a IM	132	SEQ_printf(m, " .get_time: ");
	133	print_name_offset(m, base->get_time);
	134	SEQ_printf(m, "\n");
	135	#ifdef CONFIG_HIGH_RES_TIMERS
9b04bd27 DM	136	SEQ_printf(m, " .offset: %Lu nsecs\n",
9b04bd27 DM	137	(unsigned long long) ktime_to_ns(base->offset));
289f480a IM	138	#endif
289f480a IM	139	SEQ_printf(m, "active timers:\n");
38bf985b	140	print_active_timers(m, base, now + ktime_to_ns(base->offset));
289f480a IM	141	}
	142
	143	static void print_cpu(struct seq_file *m, int cpu, u64 now)
	144	{
	145	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
	146	int i;
	147
129f1d2c	148	SEQ_printf(m, "cpu: %d\n", cpu);
289f480a IM	149	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
	150	SEQ_printf(m, " clock %d:\n", i);
	151	print_base(m, cpu_base->clock_base + i, now);
	152	}
	153	#define P(x) \
9b04bd27 DM	154	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	155	(unsigned long long)(cpu_base->x))
289f480a	156	#define P_ns(x) \
9b04bd27 DM	157	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	158	(unsigned long long)(ktime_to_ns(cpu_base->x)))
289f480a IM	159
	160	#ifdef CONFIG_HIGH_RES_TIMERS
	161	P_ns(expires_next);
	162	P(hres_active);
	163	P(nr_events);
41d2e494 TG	164	P(nr_retries);
41d2e494 TG	165	P(nr_hangs);
a6ffebce	166	P(max_hang_time);
289f480a IM	167	#endif
	168	#undef P
	169	#undef P_ns
	170
	171	#ifdef CONFIG_TICK_ONESHOT
	172	# define P(x) \
9b04bd27 DM	173	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	174	(unsigned long long)(ts->x))
289f480a	175	# define P_ns(x) \
9b04bd27 DM	176	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	177	(unsigned long long)(ktime_to_ns(ts->x)))
289f480a IM	178	{
	179	struct tick_sched *ts = tick_get_tick_sched(cpu);
	180	P(nohz_mode);
f5d411c9	181	P_ns(last_tick);
289f480a IM	182	P(tick_stopped);
	183	P(idle_jiffies);
	184	P(idle_calls);
	185	P(idle_sleeps);
	186	P_ns(idle_entrytime);
5df7fa1c TG	187	P_ns(idle_waketime);
5df7fa1c TG	188	P_ns(idle_exittime);
289f480a	189	P_ns(idle_sleeptime);
0224cf4c	190	P_ns(iowait_sleeptime);
289f480a	191	P(last_jiffies);
c1ad348b	192	P(next_timer);
289f480a	193	P_ns(idle_expires);
9b04bd27 DM	194	SEQ_printf(m, "jiffies: %Lu\n",
9b04bd27 DM	195	(unsigned long long)jiffies);
289f480a IM	196	}
	197	#endif
	198
	199	#undef P
	200	#undef P_ns
60cf7ea8	201	SEQ_printf(m, "\n");
289f480a IM	202	}
	203
	204	#ifdef CONFIG_GENERIC_CLOCKEVENTS
	205	static void
c5b77a3d	206	print_tickdevice(struct seq_file m, struct tick_device td, int cpu)
289f480a IM	207	{
	208	struct clock_event_device *dev = td->evtdev;
	209
129f1d2c	210	SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
c5b77a3d TG	211	if (cpu < 0)
	212	SEQ_printf(m, "Broadcast device\n");
	213	else
	214	SEQ_printf(m, "Per CPU device: %d\n", cpu);
289f480a IM	215
	216	SEQ_printf(m, "Clock Event Device: ");
	217	if (!dev) {
	218	SEQ_printf(m, "<NULL>\n");
	219	return;
	220	}
	221	SEQ_printf(m, "%s\n", dev->name);
97813f2f JH	222	SEQ_printf(m, " max_delta_ns: %llu\n",
	223	(unsigned long long) dev->max_delta_ns);
	224	SEQ_printf(m, " min_delta_ns: %llu\n",
	225	(unsigned long long) dev->min_delta_ns);
23af368e TG	226	SEQ_printf(m, " mult: %u\n", dev->mult);
23af368e TG	227	SEQ_printf(m, " shift: %u\n", dev->shift);
eef7635a	228	SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
289f480a IM	229	SEQ_printf(m, " next_event: %Ld nsecs\n",
	230	(unsigned long long) ktime_to_ns(dev->next_event));
	231
	232	SEQ_printf(m, " set_next_event: ");
	233	print_name_offset(m, dev->set_next_event);
	234	SEQ_printf(m, "\n");
	235
eef7635a VK	236	if (dev->set_state_shutdown) {
	237	SEQ_printf(m, " shutdown: ");
	238	print_name_offset(m, dev->set_state_shutdown);
	239	SEQ_printf(m, "\n");
	240	}
	241
	242	if (dev->set_state_periodic) {
	243	SEQ_printf(m, " periodic: ");
	244	print_name_offset(m, dev->set_state_periodic);
	245	SEQ_printf(m, "\n");
	246	}
	247
	248	if (dev->set_state_oneshot) {
	249	SEQ_printf(m, " oneshot: ");
	250	print_name_offset(m, dev->set_state_oneshot);
	251	SEQ_printf(m, "\n");
	252	}
	253
	254	if (dev->set_state_oneshot_stopped) {
	255	SEQ_printf(m, " oneshot stopped: ");
	256	print_name_offset(m, dev->set_state_oneshot_stopped);
	257	SEQ_printf(m, "\n");
	258	}
	259
	260	if (dev->tick_resume) {
	261	SEQ_printf(m, " resume: ");
	262	print_name_offset(m, dev->tick_resume);
bd624d75	263	SEQ_printf(m, "\n");
bd624d75	264	}
289f480a IM	265
	266	SEQ_printf(m, " event_handler: ");
	267	print_name_offset(m, dev->event_handler);
	268	SEQ_printf(m, "\n");
80a05b9f	269	SEQ_printf(m, " retries: %lu\n", dev->retries);
60cf7ea8	270	SEQ_printf(m, "\n");
289f480a IM	271	}
289f480a IM	272
60cf7ea8	273	static void timer_list_show_tickdevices_header(struct seq_file *m)
289f480a	274	{
289f480a	275	#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
c5b77a3d	276	print_tickdevice(m, tick_get_broadcast_device(), -1);
1ef09cd7 PM	277	SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
1ef09cd7 PM	278	cpumask_pr_args(tick_get_broadcast_mask()));
289f480a	279	#ifdef CONFIG_TICK_ONESHOT
1ef09cd7 PM	280	SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
1ef09cd7 PM	281	cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
289f480a IM	282	#endif
	283	SEQ_printf(m, "\n");
	284	#endif
289f480a	285	}
289f480a IM	286	#endif
289f480a IM	287
b3956a89	288	static inline void timer_list_header(struct seq_file *m, u64 now)
289f480a	289	{
c1ad348b	290	SEQ_printf(m, "Timer List Version: v0.8\n");
289f480a IM	291	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
289f480a IM	292	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
60cf7ea8	293	SEQ_printf(m, "\n");
b3956a89 NZ	294	}
	295
	296	static int timer_list_show(struct seq_file m, void v)
	297	{
	298	struct timer_list_iter *iter = v;
b3956a89 NZ	299
b3956a89 NZ	300	if (iter->cpu == -1 && !iter->second_pass)
84a78a65	301	timer_list_header(m, iter->now);
b3956a89 NZ	302	else if (!iter->second_pass)
	303	print_cpu(m, iter->cpu, iter->now);
	304	#ifdef CONFIG_GENERIC_CLOCKEVENTS
	305	else if (iter->cpu == -1 && iter->second_pass)
	306	timer_list_show_tickdevices_header(m);
	307	else
	308	print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
	309	#endif
	310	return 0;
	311	}
	312
	313	void sysrq_timer_list_show(void)
	314	{
	315	u64 now = ktime_to_ns(ktime_get());
	316	int cpu;
	317
	318	timer_list_header(NULL, now);
289f480a IM	319
289f480a IM	320	for_each_online_cpu(cpu)
b3956a89	321	print_cpu(NULL, cpu, now);
289f480a	322
60cf7ea8	323	#ifdef CONFIG_GENERIC_CLOCKEVENTS
b3956a89	324	timer_list_show_tickdevices_header(NULL);
60cf7ea8	325	for_each_online_cpu(cpu)
b3956a89	326	print_tickdevice(NULL, tick_get_device(cpu), cpu);
60cf7ea8	327	#endif
b3956a89 NZ	328	return;
b3956a89 NZ	329	}
289f480a	330
84a78a65	331	static void move_iter(struct timer_list_iter iter, loff_t offset)
b3956a89	332	{
84a78a65 NZ	333	for (; offset; offset--) {
	334	iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
	335	if (iter->cpu >= nr_cpu_ids) {
b3956a89	336	#ifdef CONFIG_GENERIC_CLOCKEVENTS
84a78a65 NZ	337	if (!iter->second_pass) {
	338	iter->cpu = -1;
	339	iter->second_pass = true;
	340	} else
	341	return NULL;
b3956a89	342	#else
84a78a65	343	return NULL;
b3956a89	344	#endif
84a78a65	345	}
b3956a89 NZ	346	}
b3956a89 NZ	347	return iter;
289f480a IM	348	}
289f480a IM	349
84a78a65 NZ	350	static void timer_list_start(struct seq_file file, loff_t *offset)
	351	{
	352	struct timer_list_iter *iter = file->private;
	353
	354	if (!*offset)
	355	iter->now = ktime_to_ns(ktime_get());
	356	iter->cpu = -1;
	357	iter->second_pass = false;
	358	return move_iter(iter, *offset);
	359	}
	360
b3956a89	361	static void timer_list_next(struct seq_file file, void v, loff_t offset)
289f480a	362	{
b3956a89	363	struct timer_list_iter *iter = file->private;
b3956a89	364	++*offset;
84a78a65	365	return move_iter(iter, 1);
289f480a IM	366	}
289f480a IM	367
b3956a89 NZ	368	static void timer_list_stop(struct seq_file seq, void v)
	369	{
	370	}
	371
	372	static const struct seq_operations timer_list_sops = {
	373	.start = timer_list_start,
	374	.next = timer_list_next,
	375	.stop = timer_list_stop,
	376	.show = timer_list_show,
	377	};
	378
289f480a IM	379	static int timer_list_open(struct inode inode, struct file filp)
289f480a IM	380	{
b3956a89 NZ	381	return seq_open_private(filp, &timer_list_sops,
b3956a89 NZ	382	sizeof(struct timer_list_iter));
289f480a IM	383	}
289f480a IM	384
828c0950	385	static const struct file_operations timer_list_fops = {
289f480a IM	386	.open = timer_list_open,
	387	.read = seq_read,
	388	.llseek = seq_lseek,
b3956a89	389	.release = seq_release_private,
289f480a IM	390	};
	391
	392	static int __init init_timer_list_procfs(void)
	393	{
	394	struct proc_dir_entry *pe;
	395
de809347	396	pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
289f480a IM	397	if (!pe)
289f480a IM	398	return -ENOMEM;
289f480a IM	399	return 0;
	400	}
	401	__initcall(init_timer_list_procfs);