2006-06-26 07:25:05 +00:00
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/*
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* linux/kernel/time/clocksource.c
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*
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* This file contains the functions which manage clocksource drivers.
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*
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* Copyright (C) 2004, 2005 IBM, John Stultz (johnstul@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* TODO WishList:
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* o Allow clocksource drivers to be unregistered
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* o get rid of clocksource_jiffies extern
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*/
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#include <linux/clocksource.h>
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#include <linux/sysdev.h>
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#include <linux/init.h>
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#include <linux/module.h>
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[PATCH] kernel/time/clocksource.c needs struct task_struct on m68k
kernel/time/clocksource.c needs struct task_struct on m68k.
Because it uses spin_unlock_irq(), which, on m68k, uses hardirq_count(), which
uses preempt_count(), which needs to dereference struct task_struct, we
have to include sched.h. Because it would cause a loop inclusion, we
cannot include sched.h in any other of asm-m68k/system.h,
linux/thread_info.h, linux/hardirq.h, which leaves this ugly include in
a C file as the only simple solution.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-10 09:43:43 +00:00
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#include <linux/sched.h> /* for spin_unlock_irq() using preempt_count() m68k */
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2007-02-16 09:28:03 +00:00
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#include <linux/tick.h>
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2006-06-26 07:25:05 +00:00
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/* XXX - Would like a better way for initializing curr_clocksource */
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extern struct clocksource clocksource_jiffies;
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/*[Clocksource internal variables]---------
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* curr_clocksource:
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* currently selected clocksource. Initialized to clocksource_jiffies.
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* next_clocksource:
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* pending next selected clocksource.
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* clocksource_list:
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* linked list with the registered clocksources
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* clocksource_lock:
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* protects manipulations to curr_clocksource and next_clocksource
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* and the clocksource_list
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* override_name:
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* Name of the user-specified clocksource.
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*/
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static struct clocksource *curr_clocksource = &clocksource_jiffies;
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static struct clocksource *next_clocksource;
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2007-02-16 09:27:33 +00:00
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static struct clocksource *clocksource_override;
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2006-06-26 07:25:05 +00:00
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static LIST_HEAD(clocksource_list);
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static DEFINE_SPINLOCK(clocksource_lock);
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static char override_name[32];
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static int finished_booting;
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2007-03-05 08:30:50 +00:00
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/* clocksource_done_booting - Called near the end of core bootup
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2006-06-26 07:25:05 +00:00
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*
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2007-03-05 08:30:50 +00:00
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* Hack to avoid lots of clocksource churn at boot time.
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* We use fs_initcall because we want this to start before
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* device_initcall but after subsys_initcall.
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2006-06-26 07:25:05 +00:00
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*/
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2006-06-26 07:25:06 +00:00
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static int __init clocksource_done_booting(void)
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2006-06-26 07:25:05 +00:00
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{
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finished_booting = 1;
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return 0;
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}
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2007-03-05 08:30:50 +00:00
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fs_initcall(clocksource_done_booting);
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2006-06-26 07:25:05 +00:00
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2007-02-16 09:27:43 +00:00
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#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
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static LIST_HEAD(watchdog_list);
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static struct clocksource *watchdog;
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static struct timer_list watchdog_timer;
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static DEFINE_SPINLOCK(watchdog_lock);
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static cycle_t watchdog_last;
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/*
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2007-05-09 09:33:40 +00:00
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* Interval: 0.5sec Threshold: 0.0625s
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2007-02-16 09:27:43 +00:00
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*/
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#define WATCHDOG_INTERVAL (HZ >> 1)
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2007-05-09 09:33:40 +00:00
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#define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 4)
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2007-02-16 09:27:43 +00:00
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static void clocksource_ratewd(struct clocksource *cs, int64_t delta)
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{
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2007-05-09 09:33:40 +00:00
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if (delta > -WATCHDOG_THRESHOLD && delta < WATCHDOG_THRESHOLD)
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2007-02-16 09:27:43 +00:00
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return;
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printk(KERN_WARNING "Clocksource %s unstable (delta = %Ld ns)\n",
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cs->name, delta);
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cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
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clocksource_change_rating(cs, 0);
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cs->flags &= ~CLOCK_SOURCE_WATCHDOG;
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list_del(&cs->wd_list);
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}
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static void clocksource_watchdog(unsigned long data)
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{
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struct clocksource *cs, *tmp;
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cycle_t csnow, wdnow;
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int64_t wd_nsec, cs_nsec;
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spin_lock(&watchdog_lock);
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wdnow = watchdog->read();
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wd_nsec = cyc2ns(watchdog, (wdnow - watchdog_last) & watchdog->mask);
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watchdog_last = wdnow;
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list_for_each_entry_safe(cs, tmp, &watchdog_list, wd_list) {
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csnow = cs->read();
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/* Initialized ? */
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if (!(cs->flags & CLOCK_SOURCE_WATCHDOG)) {
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if ((cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) &&
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(watchdog->flags & CLOCK_SOURCE_IS_CONTINUOUS)) {
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cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
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2007-02-16 09:28:03 +00:00
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/*
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* We just marked the clocksource as
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* highres-capable, notify the rest of the
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* system as well so that we transition
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* into high-res mode:
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*/
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tick_clock_notify();
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2007-02-16 09:27:43 +00:00
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}
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cs->flags |= CLOCK_SOURCE_WATCHDOG;
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cs->wd_last = csnow;
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} else {
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cs_nsec = cyc2ns(cs, (csnow - cs->wd_last) & cs->mask);
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cs->wd_last = csnow;
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/* Check the delta. Might remove from the list ! */
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clocksource_ratewd(cs, cs_nsec - wd_nsec);
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}
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}
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if (!list_empty(&watchdog_list)) {
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__mod_timer(&watchdog_timer,
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watchdog_timer.expires + WATCHDOG_INTERVAL);
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}
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spin_unlock(&watchdog_lock);
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}
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static void clocksource_check_watchdog(struct clocksource *cs)
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{
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struct clocksource *cse;
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unsigned long flags;
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spin_lock_irqsave(&watchdog_lock, flags);
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if (cs->flags & CLOCK_SOURCE_MUST_VERIFY) {
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int started = !list_empty(&watchdog_list);
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list_add(&cs->wd_list, &watchdog_list);
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if (!started && watchdog) {
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watchdog_last = watchdog->read();
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watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL;
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add_timer(&watchdog_timer);
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}
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2007-03-25 12:42:51 +00:00
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} else {
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if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
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2007-02-16 09:27:43 +00:00
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cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
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if (!watchdog || cs->rating > watchdog->rating) {
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if (watchdog)
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del_timer(&watchdog_timer);
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watchdog = cs;
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init_timer(&watchdog_timer);
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watchdog_timer.function = clocksource_watchdog;
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/* Reset watchdog cycles */
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list_for_each_entry(cse, &watchdog_list, wd_list)
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cse->flags &= ~CLOCK_SOURCE_WATCHDOG;
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/* Start if list is not empty */
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if (!list_empty(&watchdog_list)) {
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watchdog_last = watchdog->read();
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watchdog_timer.expires =
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jiffies + WATCHDOG_INTERVAL;
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add_timer(&watchdog_timer);
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}
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}
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}
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spin_unlock_irqrestore(&watchdog_lock, flags);
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}
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#else
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static void clocksource_check_watchdog(struct clocksource *cs)
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{
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if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
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cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
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}
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#endif
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2006-06-26 07:25:05 +00:00
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/**
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2006-06-26 07:25:14 +00:00
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* clocksource_get_next - Returns the selected clocksource
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2006-06-26 07:25:05 +00:00
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*
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*/
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2006-06-26 07:25:14 +00:00
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struct clocksource *clocksource_get_next(void)
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2006-06-26 07:25:05 +00:00
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{
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unsigned long flags;
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spin_lock_irqsave(&clocksource_lock, flags);
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if (next_clocksource && finished_booting) {
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curr_clocksource = next_clocksource;
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next_clocksource = NULL;
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}
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spin_unlock_irqrestore(&clocksource_lock, flags);
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return curr_clocksource;
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}
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/**
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2007-02-16 09:27:33 +00:00
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* select_clocksource - Selects the best registered clocksource.
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2006-06-26 07:25:05 +00:00
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*
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* Private function. Must hold clocksource_lock when called.
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*
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2007-02-16 09:27:33 +00:00
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* Select the clocksource with the best rating, or the clocksource,
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* which is selected by userspace override.
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2006-06-26 07:25:05 +00:00
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*/
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static struct clocksource *select_clocksource(void)
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{
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2007-02-16 09:27:43 +00:00
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struct clocksource *next;
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2007-02-16 09:27:33 +00:00
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if (list_empty(&clocksource_list))
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return NULL;
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2006-06-26 07:25:05 +00:00
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2007-02-16 09:27:33 +00:00
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if (clocksource_override)
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2007-02-16 09:27:43 +00:00
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next = clocksource_override;
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else
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next = list_entry(clocksource_list.next, struct clocksource,
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list);
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2006-06-26 07:25:05 +00:00
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2007-02-16 09:27:43 +00:00
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if (next == curr_clocksource)
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return NULL;
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return next;
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2006-06-26 07:25:05 +00:00
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}
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2007-02-16 09:27:33 +00:00
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/*
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* Enqueue the clocksource sorted by rating
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2006-06-26 07:25:05 +00:00
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*/
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2007-02-16 09:27:33 +00:00
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static int clocksource_enqueue(struct clocksource *c)
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2006-06-26 07:25:05 +00:00
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{
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2007-02-16 09:27:33 +00:00
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struct list_head *tmp, *entry = &clocksource_list;
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2006-06-26 07:25:05 +00:00
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list_for_each(tmp, &clocksource_list) {
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2007-02-16 09:27:33 +00:00
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struct clocksource *cs;
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cs = list_entry(tmp, struct clocksource, list);
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if (cs == c)
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return -EBUSY;
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/* Keep track of the place, where to insert */
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if (cs->rating >= c->rating)
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entry = tmp;
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2006-06-26 07:25:05 +00:00
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}
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2007-02-16 09:27:33 +00:00
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list_add(&c->list, entry);
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if (strlen(c->name) == strlen(override_name) &&
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!strcmp(c->name, override_name))
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clocksource_override = c;
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2006-06-26 07:25:05 +00:00
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return 0;
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}
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/**
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2006-06-26 07:25:14 +00:00
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* clocksource_register - Used to install new clocksources
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2006-06-26 07:25:05 +00:00
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* @t: clocksource to be registered
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*
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* Returns -EBUSY if registration fails, zero otherwise.
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*/
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2006-06-26 07:25:14 +00:00
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int clocksource_register(struct clocksource *c)
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2006-06-26 07:25:05 +00:00
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{
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unsigned long flags;
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2007-02-16 09:27:43 +00:00
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int ret;
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2006-06-26 07:25:05 +00:00
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spin_lock_irqsave(&clocksource_lock, flags);
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2007-02-16 09:27:33 +00:00
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ret = clocksource_enqueue(c);
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if (!ret)
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2006-06-26 07:25:05 +00:00
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next_clocksource = select_clocksource();
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spin_unlock_irqrestore(&clocksource_lock, flags);
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2007-02-16 09:27:43 +00:00
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if (!ret)
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clocksource_check_watchdog(c);
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2006-06-26 07:25:05 +00:00
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return ret;
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}
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2006-06-26 07:25:14 +00:00
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EXPORT_SYMBOL(clocksource_register);
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2006-06-26 07:25:05 +00:00
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/**
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2007-02-16 09:27:33 +00:00
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* clocksource_change_rating - Change the rating of a registered clocksource
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2006-06-26 07:25:05 +00:00
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*
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*/
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2007-02-16 09:27:33 +00:00
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void clocksource_change_rating(struct clocksource *cs, int rating)
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2006-06-26 07:25:05 +00:00
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{
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unsigned long flags;
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spin_lock_irqsave(&clocksource_lock, flags);
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2007-02-16 09:27:33 +00:00
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list_del(&cs->list);
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2007-02-16 09:27:43 +00:00
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cs->rating = rating;
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2007-02-16 09:27:33 +00:00
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clocksource_enqueue(cs);
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2006-06-26 07:25:05 +00:00
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next_clocksource = select_clocksource();
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spin_unlock_irqrestore(&clocksource_lock, flags);
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}
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2006-12-10 10:21:30 +00:00
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#ifdef CONFIG_SYSFS
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2006-06-26 07:25:05 +00:00
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/**
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* sysfs_show_current_clocksources - sysfs interface for current clocksource
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* @dev: unused
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* @buf: char buffer to be filled with clocksource list
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*
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* Provides sysfs interface for listing current clocksource.
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*/
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static ssize_t
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sysfs_show_current_clocksources(struct sys_device *dev, char *buf)
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{
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char *curr = buf;
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|
spin_lock_irq(&clocksource_lock);
|
|
|
|
curr += sprintf(curr, "%s ", curr_clocksource->name);
|
|
|
|
spin_unlock_irq(&clocksource_lock);
|
|
|
|
|
|
|
|
curr += sprintf(curr, "\n");
|
|
|
|
|
|
|
|
return curr - buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_override_clocksource - interface for manually overriding clocksource
|
|
|
|
* @dev: unused
|
|
|
|
* @buf: name of override clocksource
|
|
|
|
* @count: length of buffer
|
|
|
|
*
|
|
|
|
* Takes input from sysfs interface for manually overriding the default
|
|
|
|
* clocksource selction.
|
|
|
|
*/
|
|
|
|
static ssize_t sysfs_override_clocksource(struct sys_device *dev,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
2007-02-16 09:27:33 +00:00
|
|
|
struct clocksource *ovr = NULL;
|
|
|
|
struct list_head *tmp;
|
2006-06-26 07:25:05 +00:00
|
|
|
size_t ret = count;
|
2007-02-16 09:27:33 +00:00
|
|
|
int len;
|
|
|
|
|
2006-06-26 07:25:05 +00:00
|
|
|
/* strings from sysfs write are not 0 terminated! */
|
|
|
|
if (count >= sizeof(override_name))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/* strip of \n: */
|
|
|
|
if (buf[count-1] == '\n')
|
|
|
|
count--;
|
|
|
|
|
|
|
|
spin_lock_irq(&clocksource_lock);
|
|
|
|
|
2007-02-16 09:27:33 +00:00
|
|
|
if (count > 0)
|
|
|
|
memcpy(override_name, buf, count);
|
2006-06-26 07:25:05 +00:00
|
|
|
override_name[count] = 0;
|
|
|
|
|
2007-02-16 09:27:33 +00:00
|
|
|
len = strlen(override_name);
|
|
|
|
if (len) {
|
|
|
|
ovr = clocksource_override;
|
|
|
|
/* try to select it: */
|
|
|
|
list_for_each(tmp, &clocksource_list) {
|
|
|
|
struct clocksource *cs;
|
|
|
|
|
|
|
|
cs = list_entry(tmp, struct clocksource, list);
|
|
|
|
if (strlen(cs->name) == len &&
|
|
|
|
!strcmp(cs->name, override_name))
|
|
|
|
ovr = cs;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Reselect, when the override name has changed */
|
|
|
|
if (ovr != clocksource_override) {
|
|
|
|
clocksource_override = ovr;
|
|
|
|
next_clocksource = select_clocksource();
|
|
|
|
}
|
2006-06-26 07:25:05 +00:00
|
|
|
|
|
|
|
spin_unlock_irq(&clocksource_lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_show_available_clocksources - sysfs interface for listing clocksource
|
|
|
|
* @dev: unused
|
|
|
|
* @buf: char buffer to be filled with clocksource list
|
|
|
|
*
|
|
|
|
* Provides sysfs interface for listing registered clocksources
|
|
|
|
*/
|
|
|
|
static ssize_t
|
|
|
|
sysfs_show_available_clocksources(struct sys_device *dev, char *buf)
|
|
|
|
{
|
|
|
|
struct list_head *tmp;
|
|
|
|
char *curr = buf;
|
|
|
|
|
|
|
|
spin_lock_irq(&clocksource_lock);
|
|
|
|
list_for_each(tmp, &clocksource_list) {
|
|
|
|
struct clocksource *src;
|
|
|
|
|
|
|
|
src = list_entry(tmp, struct clocksource, list);
|
|
|
|
curr += sprintf(curr, "%s ", src->name);
|
|
|
|
}
|
|
|
|
spin_unlock_irq(&clocksource_lock);
|
|
|
|
|
|
|
|
curr += sprintf(curr, "\n");
|
|
|
|
|
|
|
|
return curr - buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sysfs setup bits:
|
|
|
|
*/
|
|
|
|
static SYSDEV_ATTR(current_clocksource, 0600, sysfs_show_current_clocksources,
|
2006-12-10 10:21:33 +00:00
|
|
|
sysfs_override_clocksource);
|
2006-06-26 07:25:05 +00:00
|
|
|
|
|
|
|
static SYSDEV_ATTR(available_clocksource, 0600,
|
2006-12-10 10:21:33 +00:00
|
|
|
sysfs_show_available_clocksources, NULL);
|
2006-06-26 07:25:05 +00:00
|
|
|
|
|
|
|
static struct sysdev_class clocksource_sysclass = {
|
|
|
|
set_kset_name("clocksource"),
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct sys_device device_clocksource = {
|
|
|
|
.id = 0,
|
|
|
|
.cls = &clocksource_sysclass,
|
|
|
|
};
|
|
|
|
|
2006-06-26 07:25:06 +00:00
|
|
|
static int __init init_clocksource_sysfs(void)
|
2006-06-26 07:25:05 +00:00
|
|
|
{
|
|
|
|
int error = sysdev_class_register(&clocksource_sysclass);
|
|
|
|
|
|
|
|
if (!error)
|
|
|
|
error = sysdev_register(&device_clocksource);
|
|
|
|
if (!error)
|
|
|
|
error = sysdev_create_file(
|
|
|
|
&device_clocksource,
|
|
|
|
&attr_current_clocksource);
|
|
|
|
if (!error)
|
|
|
|
error = sysdev_create_file(
|
|
|
|
&device_clocksource,
|
|
|
|
&attr_available_clocksource);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
device_initcall(init_clocksource_sysfs);
|
2006-12-10 10:21:30 +00:00
|
|
|
#endif /* CONFIG_SYSFS */
|
2006-06-26 07:25:05 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* boot_override_clocksource - boot clock override
|
|
|
|
* @str: override name
|
|
|
|
*
|
|
|
|
* Takes a clocksource= boot argument and uses it
|
|
|
|
* as the clocksource override name.
|
|
|
|
*/
|
|
|
|
static int __init boot_override_clocksource(char* str)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&clocksource_lock, flags);
|
|
|
|
if (str)
|
|
|
|
strlcpy(override_name, str, sizeof(override_name));
|
|
|
|
spin_unlock_irqrestore(&clocksource_lock, flags);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup("clocksource=", boot_override_clocksource);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* boot_override_clock - Compatibility layer for deprecated boot option
|
|
|
|
* @str: override name
|
|
|
|
*
|
|
|
|
* DEPRECATED! Takes a clock= boot argument and uses it
|
|
|
|
* as the clocksource override name
|
|
|
|
*/
|
|
|
|
static int __init boot_override_clock(char* str)
|
|
|
|
{
|
2006-06-26 07:25:12 +00:00
|
|
|
if (!strcmp(str, "pmtmr")) {
|
|
|
|
printk("Warning: clock=pmtmr is deprecated. "
|
|
|
|
"Use clocksource=acpi_pm.\n");
|
|
|
|
return boot_override_clocksource("acpi_pm");
|
|
|
|
}
|
|
|
|
printk("Warning! clock= boot option is deprecated. "
|
|
|
|
"Use clocksource=xyz\n");
|
2006-06-26 07:25:05 +00:00
|
|
|
return boot_override_clocksource(str);
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup("clock=", boot_override_clock);
|