2007-02-16 09:28:00 +00:00
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/*
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* linux/kernel/time/clockevents.c
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*
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* This file contains functions which manage clock event devices.
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*
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* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
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* Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
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*
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* This code is licenced under the GPL version 2. For details see
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* kernel-base/COPYING.
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*/
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#include <linux/clockchips.h>
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#include <linux/hrtimer.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/smp.h>
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2009-10-16 22:19:01 +00:00
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#include "tick-internal.h"
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2007-02-16 09:28:00 +00:00
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/* The registered clock event devices */
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static LIST_HEAD(clockevent_devices);
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static LIST_HEAD(clockevents_released);
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/* Notification for clock events */
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static RAW_NOTIFIER_HEAD(clockevents_chain);
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/* Protection for the above */
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2009-12-08 11:40:31 +00:00
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static DEFINE_RAW_SPINLOCK(clockevents_lock);
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2007-02-16 09:28:00 +00:00
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/**
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* clockevents_delta2ns - Convert a latch value (device ticks) to nanoseconds
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* @latch: value to convert
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* @evt: pointer to clock event device descriptor
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*
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* Math helper, returns latch value converted to nanoseconds (bound checked)
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*/
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2009-08-18 17:45:11 +00:00
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u64 clockevent_delta2ns(unsigned long latch, struct clock_event_device *evt)
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2007-02-16 09:28:00 +00:00
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{
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2009-08-18 17:45:11 +00:00
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u64 clc = (u64) latch << evt->shift;
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2007-02-16 09:28:00 +00:00
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2008-01-30 12:30:03 +00:00
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if (unlikely(!evt->mult)) {
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evt->mult = 1;
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WARN_ON(1);
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}
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2007-02-16 09:28:00 +00:00
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do_div(clc, evt->mult);
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if (clc < 1000)
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clc = 1000;
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2009-08-18 17:45:11 +00:00
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if (clc > KTIME_MAX)
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clc = KTIME_MAX;
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2007-02-16 09:28:00 +00:00
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2009-08-18 17:45:11 +00:00
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return clc;
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2007-02-16 09:28:00 +00:00
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}
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2009-05-01 05:52:47 +00:00
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EXPORT_SYMBOL_GPL(clockevent_delta2ns);
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2007-02-16 09:28:00 +00:00
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/**
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* clockevents_set_mode - set the operating mode of a clock event device
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* @dev: device to modify
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* @mode: new mode
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*
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* Must be called with interrupts disabled !
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*/
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void clockevents_set_mode(struct clock_event_device *dev,
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enum clock_event_mode mode)
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{
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if (dev->mode != mode) {
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dev->set_mode(mode, dev);
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dev->mode = mode;
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2009-01-16 08:14:38 +00:00
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/*
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* A nsec2cyc multiplicator of 0 is invalid and we'd crash
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* on it, so fix it up and emit a warning:
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*/
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if (mode == CLOCK_EVT_MODE_ONESHOT) {
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if (unlikely(!dev->mult)) {
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dev->mult = 1;
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WARN_ON(1);
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}
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}
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2007-02-16 09:28:00 +00:00
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}
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}
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2008-09-16 18:32:50 +00:00
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/**
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* clockevents_shutdown - shutdown the device and clear next_event
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* @dev: device to shutdown
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*/
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void clockevents_shutdown(struct clock_event_device *dev)
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{
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clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
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dev->next_event.tv64 = KTIME_MAX;
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}
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2011-08-23 13:29:42 +00:00
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST
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/* Limit min_delta to a jiffie */
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#define MIN_DELTA_LIMIT (NSEC_PER_SEC / HZ)
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/**
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* clockevents_increase_min_delta - raise minimum delta of a clock event device
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* @dev: device to increase the minimum delta
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*
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* Returns 0 on success, -ETIME when the minimum delta reached the limit.
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*/
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static int clockevents_increase_min_delta(struct clock_event_device *dev)
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{
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/* Nothing to do if we already reached the limit */
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if (dev->min_delta_ns >= MIN_DELTA_LIMIT) {
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printk(KERN_WARNING "CE: Reprogramming failure. Giving up\n");
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dev->next_event.tv64 = KTIME_MAX;
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return -ETIME;
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}
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if (dev->min_delta_ns < 5000)
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dev->min_delta_ns = 5000;
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else
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dev->min_delta_ns += dev->min_delta_ns >> 1;
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if (dev->min_delta_ns > MIN_DELTA_LIMIT)
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dev->min_delta_ns = MIN_DELTA_LIMIT;
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printk(KERN_WARNING "CE: %s increased min_delta_ns to %llu nsec\n",
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dev->name ? dev->name : "?",
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(unsigned long long) dev->min_delta_ns);
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return 0;
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}
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/**
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* clockevents_program_min_delta - Set clock event device to the minimum delay.
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* @dev: device to program
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*
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* Returns 0 on success, -ETIME when the retry loop failed.
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*/
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static int clockevents_program_min_delta(struct clock_event_device *dev)
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{
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unsigned long long clc;
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int64_t delta;
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int i;
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for (i = 0;;) {
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delta = dev->min_delta_ns;
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dev->next_event = ktime_add_ns(ktime_get(), delta);
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if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
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return 0;
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dev->retries++;
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clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
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if (dev->set_next_event((unsigned long) clc, dev) == 0)
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return 0;
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if (++i > 2) {
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/*
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* We tried 3 times to program the device with the
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* given min_delta_ns. Try to increase the minimum
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* delta, if that fails as well get out of here.
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*/
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if (clockevents_increase_min_delta(dev))
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return -ETIME;
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i = 0;
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}
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}
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}
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#else /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
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/**
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* clockevents_program_min_delta - Set clock event device to the minimum delay.
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* @dev: device to program
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*
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* Returns 0 on success, -ETIME when the retry loop failed.
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*/
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static int clockevents_program_min_delta(struct clock_event_device *dev)
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{
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unsigned long long clc;
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int64_t delta;
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delta = dev->min_delta_ns;
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dev->next_event = ktime_add_ns(ktime_get(), delta);
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if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
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return 0;
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dev->retries++;
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clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
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return dev->set_next_event((unsigned long) clc, dev);
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}
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#endif /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
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2007-02-16 09:28:00 +00:00
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/**
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* clockevents_program_event - Reprogram the clock event device.
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2011-08-23 13:29:42 +00:00
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* @dev: device to program
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2007-02-16 09:28:00 +00:00
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* @expires: absolute expiry time (monotonic clock)
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2011-08-23 13:29:42 +00:00
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* @force: program minimum delay if expires can not be set
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2007-02-16 09:28:00 +00:00
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*
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* Returns 0 on success, -ETIME when the event is in the past.
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*/
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int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
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2011-08-23 13:29:42 +00:00
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bool force)
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2007-02-16 09:28:00 +00:00
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{
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unsigned long long clc;
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int64_t delta;
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2011-08-23 13:29:42 +00:00
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int rc;
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2007-02-16 09:28:00 +00:00
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2007-12-07 18:16:17 +00:00
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if (unlikely(expires.tv64 < 0)) {
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WARN_ON_ONCE(1);
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return -ETIME;
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}
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2007-02-16 09:28:00 +00:00
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dev->next_event = expires;
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if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
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return 0;
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2011-08-23 13:29:43 +00:00
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/* Shortcut for clockevent devices that can deal with ktime. */
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if (dev->features & CLOCK_EVT_FEAT_KTIME)
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return dev->set_next_ktime(expires, dev);
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2011-08-23 13:29:42 +00:00
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delta = ktime_to_ns(ktime_sub(expires, ktime_get()));
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if (delta <= 0)
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return force ? clockevents_program_min_delta(dev) : -ETIME;
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2007-02-16 09:28:00 +00:00
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2011-08-23 13:29:42 +00:00
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delta = min(delta, (int64_t) dev->max_delta_ns);
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delta = max(delta, (int64_t) dev->min_delta_ns);
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2007-02-16 09:28:00 +00:00
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2011-08-23 13:29:42 +00:00
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clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
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rc = dev->set_next_event((unsigned long) clc, dev);
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return (rc && force) ? clockevents_program_min_delta(dev) : rc;
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2007-02-16 09:28:00 +00:00
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}
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/**
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* clockevents_register_notifier - register a clock events change listener
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*/
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int clockevents_register_notifier(struct notifier_block *nb)
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{
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2009-08-17 21:34:59 +00:00
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unsigned long flags;
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2007-02-16 09:28:00 +00:00
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int ret;
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2009-12-08 11:40:31 +00:00
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raw_spin_lock_irqsave(&clockevents_lock, flags);
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2007-02-16 09:28:00 +00:00
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ret = raw_notifier_chain_register(&clockevents_chain, nb);
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2009-12-08 11:40:31 +00:00
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raw_spin_unlock_irqrestore(&clockevents_lock, flags);
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2007-02-16 09:28:00 +00:00
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return ret;
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}
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/*
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* Notify about a clock event change. Called with clockevents_lock
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* held.
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*/
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static void clockevents_do_notify(unsigned long reason, void *dev)
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{
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raw_notifier_call_chain(&clockevents_chain, reason, dev);
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}
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/*
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2008-02-08 12:19:25 +00:00
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* Called after a notify add to make devices available which were
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2007-02-16 09:28:00 +00:00
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* released from the notifier call.
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*/
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static void clockevents_notify_released(void)
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{
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struct clock_event_device *dev;
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while (!list_empty(&clockevents_released)) {
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dev = list_entry(clockevents_released.next,
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struct clock_event_device, list);
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list_del(&dev->list);
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list_add(&dev->list, &clockevent_devices);
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clockevents_do_notify(CLOCK_EVT_NOTIFY_ADD, dev);
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}
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}
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/**
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* clockevents_register_device - register a clock event device
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* @dev: device to register
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*/
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void clockevents_register_device(struct clock_event_device *dev)
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{
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2009-08-17 21:34:59 +00:00
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unsigned long flags;
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2007-02-16 09:28:00 +00:00
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BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
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2011-06-03 09:13:33 +00:00
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if (!dev->cpumask) {
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WARN_ON(num_possible_cpus() > 1);
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dev->cpumask = cpumask_of(smp_processor_id());
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}
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2008-12-13 10:50:26 +00:00
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2009-12-08 11:40:31 +00:00
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raw_spin_lock_irqsave(&clockevents_lock, flags);
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2007-02-16 09:28:00 +00:00
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list_add(&dev->list, &clockevent_devices);
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clockevents_do_notify(CLOCK_EVT_NOTIFY_ADD, dev);
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clockevents_notify_released();
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2009-12-08 11:40:31 +00:00
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raw_spin_unlock_irqrestore(&clockevents_lock, flags);
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2007-02-16 09:28:00 +00:00
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}
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2009-05-01 05:52:47 +00:00
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EXPORT_SYMBOL_GPL(clockevents_register_device);
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2007-02-16 09:28:00 +00:00
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2012-05-09 14:39:34 +00:00
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void clockevents_config(struct clock_event_device *dev, u32 freq)
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2011-05-18 21:33:41 +00:00
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{
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2011-05-20 08:50:52 +00:00
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u64 sec;
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2011-05-18 21:33:41 +00:00
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if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT))
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return;
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/*
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* Calculate the maximum number of seconds we can sleep. Limit
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* to 10 minutes for hardware which can program more than
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* 32bit ticks so we still get reasonable conversion values.
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*/
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sec = dev->max_delta_ticks;
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do_div(sec, freq);
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if (!sec)
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sec = 1;
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else if (sec > 600 && dev->max_delta_ticks > UINT_MAX)
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sec = 600;
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clockevents_calc_mult_shift(dev, freq, sec);
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dev->min_delta_ns = clockevent_delta2ns(dev->min_delta_ticks, dev);
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dev->max_delta_ns = clockevent_delta2ns(dev->max_delta_ticks, dev);
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}
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/**
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* clockevents_config_and_register - Configure and register a clock event device
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* @dev: device to register
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* @freq: The clock frequency
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* @min_delta: The minimum clock ticks to program in oneshot mode
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* @max_delta: The maximum clock ticks to program in oneshot mode
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*
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* min/max_delta can be 0 for devices which do not support oneshot mode.
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|
|
*/
|
|
|
|
void clockevents_config_and_register(struct clock_event_device *dev,
|
|
|
|
u32 freq, unsigned long min_delta,
|
|
|
|
unsigned long max_delta)
|
|
|
|
{
|
|
|
|
dev->min_delta_ticks = min_delta;
|
|
|
|
dev->max_delta_ticks = max_delta;
|
|
|
|
clockevents_config(dev, freq);
|
|
|
|
clockevents_register_device(dev);
|
|
|
|
}
|
|
|
|
|
2011-05-18 21:33:42 +00:00
|
|
|
/**
|
|
|
|
* clockevents_update_freq - Update frequency and reprogram a clock event device.
|
|
|
|
* @dev: device to modify
|
|
|
|
* @freq: new device frequency
|
|
|
|
*
|
|
|
|
* Reconfigure and reprogram a clock event device in oneshot
|
|
|
|
* mode. Must be called on the cpu for which the device delivers per
|
|
|
|
* cpu timer events with interrupts disabled! Returns 0 on success,
|
|
|
|
* -ETIME when the event is in the past.
|
|
|
|
*/
|
|
|
|
int clockevents_update_freq(struct clock_event_device *dev, u32 freq)
|
|
|
|
{
|
|
|
|
clockevents_config(dev, freq);
|
|
|
|
|
|
|
|
if (dev->mode != CLOCK_EVT_MODE_ONESHOT)
|
|
|
|
return 0;
|
|
|
|
|
2011-08-23 13:29:42 +00:00
|
|
|
return clockevents_program_event(dev, dev->next_event, false);
|
2011-05-18 21:33:42 +00:00
|
|
|
}
|
|
|
|
|
2007-02-16 09:28:00 +00:00
|
|
|
/*
|
|
|
|
* Noop handler when we shut down an event device
|
|
|
|
*/
|
2008-09-03 21:36:50 +00:00
|
|
|
void clockevents_handle_noop(struct clock_event_device *dev)
|
2007-02-16 09:28:00 +00:00
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* clockevents_exchange_device - release and request clock devices
|
|
|
|
* @old: device to release (can be NULL)
|
|
|
|
* @new: device to request (can be NULL)
|
|
|
|
*
|
|
|
|
* Called from the notifier chain. clockevents_lock is held already
|
|
|
|
*/
|
|
|
|
void clockevents_exchange_device(struct clock_event_device *old,
|
|
|
|
struct clock_event_device *new)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
/*
|
|
|
|
* Caller releases a clock event device. We queue it into the
|
|
|
|
* released list and do a notify add later.
|
|
|
|
*/
|
|
|
|
if (old) {
|
|
|
|
clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
|
|
|
|
list_del(&old->list);
|
|
|
|
list_add(&old->list, &clockevents_released);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (new) {
|
|
|
|
BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED);
|
2008-09-16 18:32:50 +00:00
|
|
|
clockevents_shutdown(new);
|
2007-02-16 09:28:00 +00:00
|
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
2012-08-05 23:40:41 +00:00
|
|
|
/**
|
|
|
|
* clockevents_suspend - suspend clock devices
|
|
|
|
*/
|
|
|
|
void clockevents_suspend(void)
|
|
|
|
{
|
|
|
|
struct clock_event_device *dev;
|
|
|
|
|
|
|
|
list_for_each_entry_reverse(dev, &clockevent_devices, list)
|
|
|
|
if (dev->suspend)
|
|
|
|
dev->suspend(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* clockevents_resume - resume clock devices
|
|
|
|
*/
|
|
|
|
void clockevents_resume(void)
|
|
|
|
{
|
|
|
|
struct clock_event_device *dev;
|
|
|
|
|
|
|
|
list_for_each_entry(dev, &clockevent_devices, list)
|
|
|
|
if (dev->resume)
|
|
|
|
dev->resume(dev);
|
|
|
|
}
|
|
|
|
|
2007-10-12 21:04:05 +00:00
|
|
|
#ifdef CONFIG_GENERIC_CLOCKEVENTS
|
2007-02-16 09:28:00 +00:00
|
|
|
/**
|
|
|
|
* clockevents_notify - notification about relevant events
|
|
|
|
*/
|
|
|
|
void clockevents_notify(unsigned long reason, void *arg)
|
|
|
|
{
|
2009-12-10 14:35:10 +00:00
|
|
|
struct clock_event_device *dev, *tmp;
|
2009-08-17 21:34:59 +00:00
|
|
|
unsigned long flags;
|
2009-12-10 14:35:10 +00:00
|
|
|
int cpu;
|
2008-02-08 12:19:24 +00:00
|
|
|
|
2009-12-08 11:40:31 +00:00
|
|
|
raw_spin_lock_irqsave(&clockevents_lock, flags);
|
2007-02-16 09:28:00 +00:00
|
|
|
clockevents_do_notify(reason, arg);
|
|
|
|
|
|
|
|
switch (reason) {
|
|
|
|
case CLOCK_EVT_NOTIFY_CPU_DEAD:
|
|
|
|
/*
|
|
|
|
* Unregister the clock event devices which were
|
|
|
|
* released from the users in the notify chain.
|
|
|
|
*/
|
2009-12-10 14:35:10 +00:00
|
|
|
list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
|
|
|
|
list_del(&dev->list);
|
|
|
|
/*
|
|
|
|
* Now check whether the CPU has left unused per cpu devices
|
|
|
|
*/
|
|
|
|
cpu = *((int *)arg);
|
|
|
|
list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
|
|
|
|
if (cpumask_test_cpu(cpu, dev->cpumask) &&
|
2010-01-07 03:22:44 +00:00
|
|
|
cpumask_weight(dev->cpumask) == 1 &&
|
|
|
|
!tick_is_broadcast_device(dev)) {
|
2009-12-10 14:35:10 +00:00
|
|
|
BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
|
|
|
|
list_del(&dev->list);
|
|
|
|
}
|
|
|
|
}
|
2007-02-16 09:28:00 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
2009-12-08 11:40:31 +00:00
|
|
|
raw_spin_unlock_irqrestore(&clockevents_lock, flags);
|
2007-02-16 09:28:00 +00:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(clockevents_notify);
|
2007-10-12 21:04:05 +00:00
|
|
|
#endif
|