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kernel/time/tick-oneshot.c
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/* * linux/kernel/time/tick-oneshot.c * * This file contains functions which manage high resolution tick * related events. * * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de> * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner * * This code is licenced under the GPL version 2. For details see * kernel-base/COPYING. */ #include <linux/cpu.h> #include <linux/err.h> #include <linux/hrtimer.h> |
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#include <linux/interrupt.h> |
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#include <linux/percpu.h> #include <linux/profile.h> #include <linux/sched.h> |
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#include "tick-internal.h" |
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/** |
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* tick_program_event */ int tick_program_event(ktime_t expires, int force) { |
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struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); |
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if (unlikely(expires.tv64 == KTIME_MAX)) { /* * We don't need the clock event device any more, stop it. */ |
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clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT_STOPPED); |
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return 0; } |
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if (unlikely(clockevent_state_oneshot_stopped(dev))) { |
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/* * We need the clock event again, configure it in ONESHOT mode * before using it. */ |
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clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); |
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} |
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return clockevents_program_event(dev, expires, force); |
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} /** |
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* tick_resume_onshot - resume oneshot mode */ void tick_resume_oneshot(void) { |
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struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); |
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clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); |
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clockevents_program_event(dev, ktime_get(), true); |
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} /** |
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* tick_setup_oneshot - setup the event device for oneshot mode (hres or nohz) */ void tick_setup_oneshot(struct clock_event_device *newdev, void (*handler)(struct clock_event_device *), ktime_t next_event) { newdev->event_handler = handler; |
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clockevents_switch_state(newdev, CLOCK_EVT_STATE_ONESHOT); |
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clockevents_program_event(newdev, next_event, true); |
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} /** * tick_switch_to_oneshot - switch to oneshot mode */ int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)) { |
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struct tick_device *td = this_cpu_ptr(&tick_cpu_device); |
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struct clock_event_device *dev = td->evtdev; if (!dev || !(dev->features & CLOCK_EVT_FEAT_ONESHOT) || |
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!tick_device_is_functional(dev)) { printk(KERN_INFO "Clockevents: " "could not switch to one-shot mode:"); if (!dev) { printk(" no tick device "); } else { if (!tick_device_is_functional(dev)) printk(" %s is not functional. ", dev->name); else printk(" %s does not support one-shot mode. ", dev->name); } |
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return -EINVAL; |
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} |
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td->mode = TICKDEV_MODE_ONESHOT; dev->event_handler = handler; |
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clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); |
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tick_broadcast_switch_to_oneshot(); return 0; } |
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/** * tick_check_oneshot_mode - check whether the system is in oneshot mode * * returns 1 when either nohz or highres are enabled. otherwise 0. */ int tick_oneshot_mode_active(void) { unsigned long flags; int ret; local_irq_save(flags); |
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ret = __this_cpu_read(tick_cpu_device.mode) == TICKDEV_MODE_ONESHOT; |
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local_irq_restore(flags); return ret; } |
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#ifdef CONFIG_HIGH_RES_TIMERS /** * tick_init_highres - switch to high resolution mode * * Called with interrupts disabled. */ int tick_init_highres(void) { return tick_switch_to_oneshot(hrtimer_interrupt); } #endif |