/* * 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]; 	if (lookup_symbol_name((unsigned long)sym, symname) < 0)		SEQ_printf(m, "<%p>", sym);	else		SEQ_printf(m, "%s", symname);} static voidprint_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:%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 %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 voidprint_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, timer, &tmp, i, now);		next++;		goto next_one;	}	spin_unlock_irqrestore(&base->cpu_base->lock, flags);} static voidprint_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now){	SEQ_printf(m, "  .base:       %p\n", base);	SEQ_printf(m, "  .index:      %d\n",			base->index);	SEQ_printf(m, "  .resolution: %Lu 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:     %Lu nsecs\n",		   (unsigned long long) 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, "\n");	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);#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(idle_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(last_jiffies);		P(next_jiffies);		P_ns(idle_expires);		SEQ_printf(m, "jiffies: %Lu\n",			   (unsigned long long)jiffies);	}#endif #undef P#undef P_ns} #ifdef CONFIG_GENERIC_CLOCKEVENTSstatic voidprint_tickdevice(struct seq_file *m, struct tick_device *td, int cpu){	struct clock_event_device *dev = td->evtdev; 	SEQ_printf(m, "\n");	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:   %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(), -1);	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), cpu);	SEQ_printf(m, "\n");}#elsestatic 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: v0.4\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 const struct file_operations timer_list_fops = {	.open		= timer_list_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= single_release,}; 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);