[mirror_ubuntu-artful-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/nmi.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)
{
	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);
	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;

	touch_nmi_watchdog();

	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", 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;

	touch_nmi_watchdog();

	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>
01070427	19	#include <linux/nmi.h>
289f480a	20
7c0f6ba6	21	#include <linux/uaccess.h>
289f480a	22
c1797baf	23	#include "tick-internal.h"
b3956a89 NZ	24
	25	struct timer_list_iter {
	26	int cpu;
	27	bool second_pass;
	28	u64 now;
	29	};
	30
289f480a IM	31	typedef void (print_fn_t)(struct seq_file m, unsigned int *classes);
289f480a IM	32
289f480a IM	33	/*
	34	* This allows printing both to /proc/timer_list and
	35	* to the console (on SysRq-Q):
	36	*/
7de4e744 JP	37	__printf(2, 3)
	38	static void SEQ_printf(struct seq_file m, const char fmt, ...)
	39	{
	40	va_list args;
	41
	42	va_start(args, fmt);
	43
	44	if (m)
	45	seq_vprintf(m, fmt, args);
	46	else
	47	vprintk(fmt, args);
	48
	49	va_end(args);
	50	}
289f480a IM	51
	52	static void print_name_offset(struct seq_file m, void sym)
	53	{
9281acea	54	char symname[KSYM_NAME_LEN];
289f480a	55
9d65cb4a	56	if (lookup_symbol_name((unsigned long)sym, symname) < 0)
f5903085	57	SEQ_printf(m, "<%pK>", sym);
9d65cb4a AD	58	else
9d65cb4a AD	59	SEQ_printf(m, "%s", symname);
289f480a IM	60	}
	61
	62	static void
e67ef25a TG	63	print_timer(struct seq_file m, struct hrtimer taddr, struct hrtimer *timer,
e67ef25a TG	64	int idx, u64 now)
289f480a	65	{
289f480a	66	SEQ_printf(m, " #%d: ", idx);
e67ef25a	67	print_name_offset(m, taddr);
289f480a IM	68	SEQ_printf(m, ", ");
289f480a IM	69	print_name_offset(m, timer->function);
203cbf77	70	SEQ_printf(m, ", S:%02x", timer->state);
289f480a	71	SEQ_printf(m, "\n");
704af52b AV	72	SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n",
704af52b AV	73	(unsigned long long)ktime_to_ns(hrtimer_get_softexpires(timer)),
cc584b21	74	(unsigned long long)ktime_to_ns(hrtimer_get_expires(timer)),
704af52b	75	(long long)(ktime_to_ns(hrtimer_get_softexpires(timer)) - now),
cc584b21	76	(long long)(ktime_to_ns(hrtimer_get_expires(timer)) - now));
289f480a IM	77	}
	78
	79	static void
	80	print_active_timers(struct seq_file m, struct hrtimer_clock_base base,
	81	u64 now)
	82	{
	83	struct hrtimer *timer, tmp;
	84	unsigned long next = 0, i;
998adc3d	85	struct timerqueue_node *curr;
289f480a IM	86	unsigned long flags;
	87
	88	next_one:
	89	i = 0;
01070427 TH	90
	91	touch_nmi_watchdog();
	92
ecb49d1a	93	raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
289f480a	94
998adc3d	95	curr = timerqueue_getnext(&base->active);
289f480a IM	96	/*
	97	* Crude but we have to do this O(N*N) thing, because
	98	* we have to unlock the base when printing:
	99	*/
	100	while (curr && i < next) {
998adc3d	101	curr = timerqueue_iterate_next(curr);
289f480a IM	102	i++;
	103	}
	104
	105	if (curr) {
	106
998adc3d	107	timer = container_of(curr, struct hrtimer, node);
289f480a	108	tmp = *timer;
ecb49d1a	109	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a	110
e67ef25a	111	print_timer(m, timer, &tmp, i, now);
289f480a IM	112	next++;
	113	goto next_one;
	114	}
ecb49d1a	115	raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
289f480a IM	116	}
	117
	118	static void
	119	print_base(struct seq_file m, struct hrtimer_clock_base base, u64 now)
	120	{
f5903085	121	SEQ_printf(m, " .base: %pK\n", base);
398ca17f TG	122	SEQ_printf(m, " .index: %d\n", base->index);
398ca17f TG	123
7551b02b	124	SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution);
398ca17f	125
289f480a IM	126	SEQ_printf(m, " .get_time: ");
	127	print_name_offset(m, base->get_time);
	128	SEQ_printf(m, "\n");
	129	#ifdef CONFIG_HIGH_RES_TIMERS
9b04bd27 DM	130	SEQ_printf(m, " .offset: %Lu nsecs\n",
9b04bd27 DM	131	(unsigned long long) ktime_to_ns(base->offset));
289f480a IM	132	#endif
289f480a IM	133	SEQ_printf(m, "active timers:\n");
38bf985b	134	print_active_timers(m, base, now + ktime_to_ns(base->offset));
289f480a IM	135	}
	136
	137	static void print_cpu(struct seq_file *m, int cpu, u64 now)
	138	{
	139	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
	140	int i;
	141
129f1d2c	142	SEQ_printf(m, "cpu: %d\n", cpu);
289f480a IM	143	for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
	144	SEQ_printf(m, " clock %d:\n", i);
	145	print_base(m, cpu_base->clock_base + i, now);
	146	}
	147	#define P(x) \
9b04bd27 DM	148	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	149	(unsigned long long)(cpu_base->x))
289f480a	150	#define P_ns(x) \
9b04bd27 DM	151	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	152	(unsigned long long)(ktime_to_ns(cpu_base->x)))
289f480a IM	153
	154	#ifdef CONFIG_HIGH_RES_TIMERS
	155	P_ns(expires_next);
	156	P(hres_active);
	157	P(nr_events);
41d2e494 TG	158	P(nr_retries);
41d2e494 TG	159	P(nr_hangs);
a6ffebce	160	P(max_hang_time);
289f480a IM	161	#endif
	162	#undef P
	163	#undef P_ns
	164
	165	#ifdef CONFIG_TICK_ONESHOT
	166	# define P(x) \
9b04bd27 DM	167	SEQ_printf(m, " .%-15s: %Lu\n", #x, \
9b04bd27 DM	168	(unsigned long long)(ts->x))
289f480a	169	# define P_ns(x) \
9b04bd27 DM	170	SEQ_printf(m, " .%-15s: %Lu nsecs\n", #x, \
9b04bd27 DM	171	(unsigned long long)(ktime_to_ns(ts->x)))
289f480a IM	172	{
	173	struct tick_sched *ts = tick_get_tick_sched(cpu);
	174	P(nohz_mode);
f5d411c9	175	P_ns(last_tick);
289f480a IM	176	P(tick_stopped);
	177	P(idle_jiffies);
	178	P(idle_calls);
	179	P(idle_sleeps);
	180	P_ns(idle_entrytime);
5df7fa1c TG	181	P_ns(idle_waketime);
5df7fa1c TG	182	P_ns(idle_exittime);
289f480a	183	P_ns(idle_sleeptime);
0224cf4c	184	P_ns(iowait_sleeptime);
289f480a	185	P(last_jiffies);
c1ad348b	186	P(next_timer);
289f480a	187	P_ns(idle_expires);
9b04bd27 DM	188	SEQ_printf(m, "jiffies: %Lu\n",
9b04bd27 DM	189	(unsigned long long)jiffies);
289f480a IM	190	}
	191	#endif
	192
	193	#undef P
	194	#undef P_ns
60cf7ea8	195	SEQ_printf(m, "\n");
289f480a IM	196	}
	197
	198	#ifdef CONFIG_GENERIC_CLOCKEVENTS
	199	static void
c5b77a3d	200	print_tickdevice(struct seq_file m, struct tick_device td, int cpu)
289f480a IM	201	{
	202	struct clock_event_device *dev = td->evtdev;
	203
01070427 TH	204	touch_nmi_watchdog();
01070427 TH	205
129f1d2c	206	SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
c5b77a3d TG	207	if (cpu < 0)
	208	SEQ_printf(m, "Broadcast device\n");
	209	else
	210	SEQ_printf(m, "Per CPU device: %d\n", cpu);
289f480a IM	211
	212	SEQ_printf(m, "Clock Event Device: ");
	213	if (!dev) {
	214	SEQ_printf(m, "<NULL>\n");
	215	return;
	216	}
	217	SEQ_printf(m, "%s\n", dev->name);
97813f2f JH	218	SEQ_printf(m, " max_delta_ns: %llu\n",
	219	(unsigned long long) dev->max_delta_ns);
	220	SEQ_printf(m, " min_delta_ns: %llu\n",
	221	(unsigned long long) dev->min_delta_ns);
23af368e TG	222	SEQ_printf(m, " mult: %u\n", dev->mult);
23af368e TG	223	SEQ_printf(m, " shift: %u\n", dev->shift);
eef7635a	224	SEQ_printf(m, " mode: %d\n", clockevent_get_state(dev));
289f480a IM	225	SEQ_printf(m, " next_event: %Ld nsecs\n",
	226	(unsigned long long) ktime_to_ns(dev->next_event));
	227
	228	SEQ_printf(m, " set_next_event: ");
	229	print_name_offset(m, dev->set_next_event);
	230	SEQ_printf(m, "\n");
	231
eef7635a VK	232	if (dev->set_state_shutdown) {
	233	SEQ_printf(m, " shutdown: ");
	234	print_name_offset(m, dev->set_state_shutdown);
	235	SEQ_printf(m, "\n");
	236	}
	237
	238	if (dev->set_state_periodic) {
	239	SEQ_printf(m, " periodic: ");
	240	print_name_offset(m, dev->set_state_periodic);
	241	SEQ_printf(m, "\n");
	242	}
	243
	244	if (dev->set_state_oneshot) {
	245	SEQ_printf(m, " oneshot: ");
	246	print_name_offset(m, dev->set_state_oneshot);
	247	SEQ_printf(m, "\n");
	248	}
	249
	250	if (dev->set_state_oneshot_stopped) {
	251	SEQ_printf(m, " oneshot stopped: ");
	252	print_name_offset(m, dev->set_state_oneshot_stopped);
	253	SEQ_printf(m, "\n");
	254	}
	255
	256	if (dev->tick_resume) {
	257	SEQ_printf(m, " resume: ");
	258	print_name_offset(m, dev->tick_resume);
bd624d75	259	SEQ_printf(m, "\n");
bd624d75	260	}
289f480a IM	261
	262	SEQ_printf(m, " event_handler: ");
	263	print_name_offset(m, dev->event_handler);
	264	SEQ_printf(m, "\n");
80a05b9f	265	SEQ_printf(m, " retries: %lu\n", dev->retries);
60cf7ea8	266	SEQ_printf(m, "\n");
289f480a IM	267	}
289f480a IM	268
60cf7ea8	269	static void timer_list_show_tickdevices_header(struct seq_file *m)
289f480a	270	{
289f480a	271	#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
c5b77a3d	272	print_tickdevice(m, tick_get_broadcast_device(), -1);
1ef09cd7 PM	273	SEQ_printf(m, "tick_broadcast_mask: %*pb\n",
1ef09cd7 PM	274	cpumask_pr_args(tick_get_broadcast_mask()));
289f480a	275	#ifdef CONFIG_TICK_ONESHOT
1ef09cd7 PM	276	SEQ_printf(m, "tick_broadcast_oneshot_mask: %*pb\n",
1ef09cd7 PM	277	cpumask_pr_args(tick_get_broadcast_oneshot_mask()));
289f480a IM	278	#endif
	279	SEQ_printf(m, "\n");
	280	#endif
289f480a	281	}
289f480a IM	282	#endif
289f480a IM	283
b3956a89	284	static inline void timer_list_header(struct seq_file *m, u64 now)
289f480a	285	{
c1ad348b	286	SEQ_printf(m, "Timer List Version: v0.8\n");
289f480a IM	287	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
289f480a IM	288	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
60cf7ea8	289	SEQ_printf(m, "\n");
b3956a89 NZ	290	}
	291
	292	static int timer_list_show(struct seq_file m, void v)
	293	{
	294	struct timer_list_iter *iter = v;
b3956a89 NZ	295
b3956a89 NZ	296	if (iter->cpu == -1 && !iter->second_pass)
84a78a65	297	timer_list_header(m, iter->now);
b3956a89 NZ	298	else if (!iter->second_pass)
	299	print_cpu(m, iter->cpu, iter->now);
	300	#ifdef CONFIG_GENERIC_CLOCKEVENTS
	301	else if (iter->cpu == -1 && iter->second_pass)
	302	timer_list_show_tickdevices_header(m);
	303	else
	304	print_tickdevice(m, tick_get_device(iter->cpu), iter->cpu);
	305	#endif
	306	return 0;
	307	}
	308
	309	void sysrq_timer_list_show(void)
	310	{
	311	u64 now = ktime_to_ns(ktime_get());
	312	int cpu;
	313
	314	timer_list_header(NULL, now);
289f480a IM	315
289f480a IM	316	for_each_online_cpu(cpu)
b3956a89	317	print_cpu(NULL, cpu, now);
289f480a	318
60cf7ea8	319	#ifdef CONFIG_GENERIC_CLOCKEVENTS
b3956a89	320	timer_list_show_tickdevices_header(NULL);
60cf7ea8	321	for_each_online_cpu(cpu)
b3956a89	322	print_tickdevice(NULL, tick_get_device(cpu), cpu);
60cf7ea8	323	#endif
b3956a89 NZ	324	return;
b3956a89 NZ	325	}
289f480a	326
84a78a65	327	static void move_iter(struct timer_list_iter iter, loff_t offset)
b3956a89	328	{
84a78a65 NZ	329	for (; offset; offset--) {
	330	iter->cpu = cpumask_next(iter->cpu, cpu_online_mask);
	331	if (iter->cpu >= nr_cpu_ids) {
b3956a89	332	#ifdef CONFIG_GENERIC_CLOCKEVENTS
84a78a65 NZ	333	if (!iter->second_pass) {
	334	iter->cpu = -1;
	335	iter->second_pass = true;
	336	} else
	337	return NULL;
b3956a89	338	#else
84a78a65	339	return NULL;
b3956a89	340	#endif
84a78a65	341	}
b3956a89 NZ	342	}
b3956a89 NZ	343	return iter;
289f480a IM	344	}
289f480a IM	345
84a78a65 NZ	346	static void timer_list_start(struct seq_file file, loff_t *offset)
	347	{
	348	struct timer_list_iter *iter = file->private;
	349
	350	if (!*offset)
	351	iter->now = ktime_to_ns(ktime_get());
	352	iter->cpu = -1;
	353	iter->second_pass = false;
	354	return move_iter(iter, *offset);
	355	}
	356
b3956a89	357	static void timer_list_next(struct seq_file file, void v, loff_t offset)
289f480a	358	{
b3956a89	359	struct timer_list_iter *iter = file->private;
b3956a89	360	++*offset;
84a78a65	361	return move_iter(iter, 1);
289f480a IM	362	}
289f480a IM	363
b3956a89 NZ	364	static void timer_list_stop(struct seq_file seq, void v)
	365	{
	366	}
	367
	368	static const struct seq_operations timer_list_sops = {
	369	.start = timer_list_start,
	370	.next = timer_list_next,
	371	.stop = timer_list_stop,
	372	.show = timer_list_show,
	373	};
	374
289f480a IM	375	static int timer_list_open(struct inode inode, struct file filp)
289f480a IM	376	{
b3956a89 NZ	377	return seq_open_private(filp, &timer_list_sops,
b3956a89 NZ	378	sizeof(struct timer_list_iter));
289f480a IM	379	}
289f480a IM	380
828c0950	381	static const struct file_operations timer_list_fops = {
289f480a IM	382	.open = timer_list_open,
	383	.read = seq_read,
	384	.llseek = seq_lseek,
b3956a89	385	.release = seq_release_private,
289f480a IM	386	};
	387
	388	static int __init init_timer_list_procfs(void)
	389	{
	390	struct proc_dir_entry *pe;
	391
de809347	392	pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
289f480a IM	393	if (!pe)
289f480a IM	394	return -ENOMEM;
289f480a IM	395	return 0;
	396	}
	397	__initcall(init_timer_list_procfs);