2007-02-16 10:28:02 +01:00
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/*
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* linux/kernel/time/tick-broadcast.c
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*
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* This file contains functions which emulate a local clock-event
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* device via a broadcast event source.
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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/cpu.h>
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#include <linux/err.h>
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#include <linux/hrtimer.h>
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#include <linux/irq.h>
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#include <linux/percpu.h>
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#include <linux/profile.h>
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#include <linux/sched.h>
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#include <linux/tick.h>
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#include "tick-internal.h"
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/*
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* Broadcast support for broken x86 hardware, where the local apic
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* timer stops in C3 state.
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*/
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struct tick_device tick_broadcast_device;
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static cpumask_t tick_broadcast_mask;
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2007-02-16 10:28:03 +01:00
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static DEFINE_SPINLOCK(tick_broadcast_lock);
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2007-02-16 10:28:02 +01:00
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2007-07-21 13:37:35 +02:00
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#ifdef CONFIG_TICK_ONESHOT
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static void tick_broadcast_clear_oneshot(int cpu);
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#else
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static inline void tick_broadcast_clear_oneshot(int cpu) { }
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#endif
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[PATCH] Add debugging feature /proc/timer_list
add /proc/timer_list, which prints all currently pending (high-res) timers,
all clock-event sources and their parameters in a human-readable form.
Sample output:
Timer List Version: v0.1
HRTIMER_MAX_CLOCK_BASES: 2
now at 4246046273872 nsecs
cpu: 0
clock 0:
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 1273998312645738432 nsecs
active timers:
clock 1:
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
#0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_stop_sched_tick, swapper/0
# expires at 4246432689566 nsecs [in 386415694 nsecs]
#1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, pcscd/2050
# expires at 4247018194689 nsecs [in 971920817 nsecs]
#2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, irqbalance/1909
# expires at 4247351358392 nsecs [in 1305084520 nsecs]
#3: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, crond/2157
# expires at 4249097614968 nsecs [in 3051341096 nsecs]
#4: <f5a90ec8>, it_real_fn, do_setitimer, syslogd/1888
# expires at 4251329900926 nsecs [in 5283627054 nsecs]
.expires_next : 4246432689566 nsecs
.hres_active : 1
.check_clocks : 0
.nr_events : 31306
.idle_tick : 4246020791890 nsecs
.tick_stopped : 1
.idle_jiffies : 986504
.idle_calls : 40700
.idle_sleeps : 36014
.idle_entrytime : 4246019418883 nsecs
.idle_sleeptime : 4178181972709 nsecs
cpu: 1
clock 0:
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 1273998312645738432 nsecs
active timers:
clock 1:
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
#0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_restart_sched_tick, swapper/0
# expires at 4246050084568 nsecs [in 3810696 nsecs]
#1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, atd/2227
# expires at 4261010635003 nsecs [in 14964361131 nsecs]
#2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, smartd/2332
# expires at 5469485798970 nsecs [in 1223439525098 nsecs]
.expires_next : 4246050084568 nsecs
.hres_active : 1
.check_clocks : 0
.nr_events : 24043
.idle_tick : 4246046084568 nsecs
.tick_stopped : 0
.idle_jiffies : 986510
.idle_calls : 26360
.idle_sleeps : 22551
.idle_entrytime : 4246043874339 nsecs
.idle_sleeptime : 4170763761184 nsecs
tick_broadcast_mask: 00000003
event_broadcast_mask: 00000001
CPU#0's local event device:
Clock Event Device: lapic
capabilities: 0000000e
max_delta_ns: 807385544
min_delta_ns: 1443
mult: 44624025
shift: 32
set_next_event: lapic_next_event
set_mode: lapic_timer_setup
event_handler: hrtimer_interrupt
.installed: 1
.expires: 4246432689566 nsecs
CPU#1's local event device:
Clock Event Device: lapic
capabilities: 0000000e
max_delta_ns: 807385544
min_delta_ns: 1443
mult: 44624025
shift: 32
set_next_event: lapic_next_event
set_mode: lapic_timer_setup
event_handler: hrtimer_interrupt
.installed: 1
.expires: 4246050084568 nsecs
Clock Event Device: hpet
capabilities: 00000007
max_delta_ns: 2147483647
min_delta_ns: 3352
mult: 61496110
shift: 32
set_next_event: hpet_next_event
set_mode: hpet_set_mode
event_handler: handle_nextevt_broadcast
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-16 10:28:15 +01:00
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/*
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* Debugging: see timer_list.c
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*/
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struct tick_device *tick_get_broadcast_device(void)
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{
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return &tick_broadcast_device;
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}
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cpumask_t *tick_get_broadcast_mask(void)
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{
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return &tick_broadcast_mask;
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}
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2007-02-16 10:28:02 +01:00
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/*
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* Start the device in periodic mode
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*/
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static void tick_broadcast_start_periodic(struct clock_event_device *bc)
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{
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2007-07-21 13:37:34 +02:00
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if (bc)
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2007-02-16 10:28:02 +01:00
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tick_setup_periodic(bc, 1);
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}
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/*
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* Check, if the device can be utilized as broadcast device:
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*/
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int tick_check_broadcast_device(struct clock_event_device *dev)
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{
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if (tick_broadcast_device.evtdev ||
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(dev->features & CLOCK_EVT_FEAT_C3STOP))
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return 0;
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clockevents_exchange_device(NULL, dev);
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tick_broadcast_device.evtdev = dev;
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if (!cpus_empty(tick_broadcast_mask))
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tick_broadcast_start_periodic(dev);
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return 1;
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}
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/*
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* Check, if the device is the broadcast device
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*/
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int tick_is_broadcast_device(struct clock_event_device *dev)
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{
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return (dev && tick_broadcast_device.evtdev == dev);
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}
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/*
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* Check, if the device is disfunctional and a place holder, which
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* needs to be handled by the broadcast device.
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*/
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int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&tick_broadcast_lock, flags);
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/*
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* Devices might be registered with both periodic and oneshot
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* mode disabled. This signals, that the device needs to be
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* operated from the broadcast device and is a placeholder for
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* the cpu local device.
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*/
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if (!tick_device_is_functional(dev)) {
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dev->event_handler = tick_handle_periodic;
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cpu_set(cpu, tick_broadcast_mask);
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tick_broadcast_start_periodic(tick_broadcast_device.evtdev);
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ret = 1;
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2007-07-21 13:37:35 +02:00
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} else {
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/*
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* When the new device is not affected by the stop
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* feature and the cpu is marked in the broadcast mask
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* then clear the broadcast bit.
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*/
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if (!(dev->features & CLOCK_EVT_FEAT_C3STOP)) {
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int cpu = smp_processor_id();
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2007-02-16 10:28:02 +01:00
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2007-07-21 13:37:35 +02:00
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cpu_clear(cpu, tick_broadcast_mask);
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tick_broadcast_clear_oneshot(cpu);
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}
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}
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2007-02-16 10:28:02 +01:00
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spin_unlock_irqrestore(&tick_broadcast_lock, flags);
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return ret;
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}
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/*
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* Broadcast the event to the cpus, which are set in the mask
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*/
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int tick_do_broadcast(cpumask_t mask)
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{
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int ret = 0, cpu = smp_processor_id();
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struct tick_device *td;
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/*
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* Check, if the current cpu is in the mask
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*/
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if (cpu_isset(cpu, mask)) {
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cpu_clear(cpu, mask);
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td = &per_cpu(tick_cpu_device, cpu);
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td->evtdev->event_handler(td->evtdev);
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ret = 1;
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}
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if (!cpus_empty(mask)) {
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/*
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* It might be necessary to actually check whether the devices
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* have different broadcast functions. For now, just use the
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* one of the first device. This works as long as we have this
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* misfeature only on x86 (lapic)
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*/
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cpu = first_cpu(mask);
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td = &per_cpu(tick_cpu_device, cpu);
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td->evtdev->broadcast(mask);
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ret = 1;
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}
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return ret;
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}
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/*
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* Periodic broadcast:
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* - invoke the broadcast handlers
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*/
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static void tick_do_periodic_broadcast(void)
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{
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cpumask_t mask;
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spin_lock(&tick_broadcast_lock);
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cpus_and(mask, cpu_online_map, tick_broadcast_mask);
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tick_do_broadcast(mask);
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spin_unlock(&tick_broadcast_lock);
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}
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/*
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* Event handler for periodic broadcast ticks
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*/
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static void tick_handle_periodic_broadcast(struct clock_event_device *dev)
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{
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tick_do_periodic_broadcast();
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/*
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* The device is in periodic mode. No reprogramming necessary:
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*/
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if (dev->mode == CLOCK_EVT_MODE_PERIODIC)
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return;
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/*
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* Setup the next period for devices, which do not have
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* periodic mode:
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*/
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for (;;) {
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ktime_t next = ktime_add(dev->next_event, tick_period);
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if (!clockevents_program_event(dev, next, ktime_get()))
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return;
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tick_do_periodic_broadcast();
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}
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}
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/*
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* Powerstate information: The system enters/leaves a state, where
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* affected devices might stop
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*/
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static void tick_do_broadcast_on_off(void *why)
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{
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struct clock_event_device *bc, *dev;
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struct tick_device *td;
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unsigned long flags, *reason = why;
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int cpu;
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spin_lock_irqsave(&tick_broadcast_lock, flags);
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cpu = smp_processor_id();
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td = &per_cpu(tick_cpu_device, cpu);
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dev = td->evtdev;
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bc = tick_broadcast_device.evtdev;
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/*
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* Is the device in broadcast mode forever or is it not
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* affected by the powerstate ?
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*/
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if (!dev || !tick_device_is_functional(dev) ||
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!(dev->features & CLOCK_EVT_FEAT_C3STOP))
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goto out;
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if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_ON) {
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if (!cpu_isset(cpu, tick_broadcast_mask)) {
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cpu_set(cpu, tick_broadcast_mask);
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if (td->mode == TICKDEV_MODE_PERIODIC)
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clockevents_set_mode(dev,
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CLOCK_EVT_MODE_SHUTDOWN);
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}
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} else {
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if (cpu_isset(cpu, tick_broadcast_mask)) {
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cpu_clear(cpu, tick_broadcast_mask);
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if (td->mode == TICKDEV_MODE_PERIODIC)
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tick_setup_periodic(dev, 0);
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}
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}
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if (cpus_empty(tick_broadcast_mask))
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clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
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else {
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if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
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tick_broadcast_start_periodic(bc);
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2007-02-16 10:28:03 +01:00
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else
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tick_broadcast_setup_oneshot(bc);
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2007-02-16 10:28:02 +01:00
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}
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out:
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spin_unlock_irqrestore(&tick_broadcast_lock, flags);
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}
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/*
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* Powerstate information: The system enters/leaves a state, where
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* affected devices might stop.
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*/
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void tick_broadcast_on_off(unsigned long reason, int *oncpu)
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{
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int cpu = get_cpu();
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2007-05-23 22:57:30 +02:00
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if (!cpu_isset(*oncpu, cpu_online_map)) {
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printk(KERN_ERR "tick-braodcast: ignoring broadcast for "
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"offline CPU #%d\n", *oncpu);
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} else {
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if (cpu == *oncpu)
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tick_do_broadcast_on_off(&reason);
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else
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smp_call_function_single(*oncpu,
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tick_do_broadcast_on_off,
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&reason, 1, 1);
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}
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2007-02-16 10:28:02 +01:00
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put_cpu();
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}
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/*
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* Set the periodic handler depending on broadcast on/off
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*/
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void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
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{
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if (!broadcast)
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dev->event_handler = tick_handle_periodic;
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else
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dev->event_handler = tick_handle_periodic_broadcast;
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}
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/*
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* Remove a CPU from broadcasting
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*/
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void tick_shutdown_broadcast(unsigned int *cpup)
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{
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struct clock_event_device *bc;
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unsigned long flags;
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unsigned int cpu = *cpup;
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spin_lock_irqsave(&tick_broadcast_lock, flags);
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bc = tick_broadcast_device.evtdev;
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cpu_clear(cpu, tick_broadcast_mask);
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if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
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if (bc && cpus_empty(tick_broadcast_mask))
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clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
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}
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|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
}
|
2007-02-16 10:28:03 +01:00
|
|
|
|
2007-03-06 08:25:42 +01:00
|
|
|
void tick_suspend_broadcast(void)
|
|
|
|
{
|
|
|
|
struct clock_event_device *bc;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tick_broadcast_lock, flags);
|
|
|
|
|
|
|
|
bc = tick_broadcast_device.evtdev;
|
2007-07-21 13:37:34 +02:00
|
|
|
if (bc)
|
2007-03-06 08:25:42 +01:00
|
|
|
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
int tick_resume_broadcast(void)
|
|
|
|
{
|
|
|
|
struct clock_event_device *bc;
|
|
|
|
unsigned long flags;
|
|
|
|
int broadcast = 0;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tick_broadcast_lock, flags);
|
|
|
|
|
|
|
|
bc = tick_broadcast_device.evtdev;
|
|
|
|
|
2007-03-17 00:25:52 +01:00
|
|
|
if (bc) {
|
2007-07-21 13:37:34 +02:00
|
|
|
clockevents_set_mode(bc, CLOCK_EVT_MODE_RESUME);
|
|
|
|
|
2007-03-17 00:25:52 +01:00
|
|
|
switch (tick_broadcast_device.mode) {
|
|
|
|
case TICKDEV_MODE_PERIODIC:
|
|
|
|
if(!cpus_empty(tick_broadcast_mask))
|
|
|
|
tick_broadcast_start_periodic(bc);
|
|
|
|
broadcast = cpu_isset(smp_processor_id(),
|
|
|
|
tick_broadcast_mask);
|
|
|
|
break;
|
|
|
|
case TICKDEV_MODE_ONESHOT:
|
|
|
|
broadcast = tick_resume_broadcast_oneshot(bc);
|
|
|
|
break;
|
|
|
|
}
|
2007-03-06 08:25:42 +01:00
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
|
|
|
|
return broadcast;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-02-16 10:28:03 +01:00
|
|
|
#ifdef CONFIG_TICK_ONESHOT
|
|
|
|
|
|
|
|
static cpumask_t tick_broadcast_oneshot_mask;
|
|
|
|
|
[PATCH] Add debugging feature /proc/timer_list
add /proc/timer_list, which prints all currently pending (high-res) timers,
all clock-event sources and their parameters in a human-readable form.
Sample output:
Timer List Version: v0.1
HRTIMER_MAX_CLOCK_BASES: 2
now at 4246046273872 nsecs
cpu: 0
clock 0:
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 1273998312645738432 nsecs
active timers:
clock 1:
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
#0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_stop_sched_tick, swapper/0
# expires at 4246432689566 nsecs [in 386415694 nsecs]
#1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, pcscd/2050
# expires at 4247018194689 nsecs [in 971920817 nsecs]
#2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, irqbalance/1909
# expires at 4247351358392 nsecs [in 1305084520 nsecs]
#3: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, crond/2157
# expires at 4249097614968 nsecs [in 3051341096 nsecs]
#4: <f5a90ec8>, it_real_fn, do_setitimer, syslogd/1888
# expires at 4251329900926 nsecs [in 5283627054 nsecs]
.expires_next : 4246432689566 nsecs
.hres_active : 1
.check_clocks : 0
.nr_events : 31306
.idle_tick : 4246020791890 nsecs
.tick_stopped : 1
.idle_jiffies : 986504
.idle_calls : 40700
.idle_sleeps : 36014
.idle_entrytime : 4246019418883 nsecs
.idle_sleeptime : 4178181972709 nsecs
cpu: 1
clock 0:
.index: 0
.resolution: 1 nsecs
.get_time: ktime_get_real
.offset: 1273998312645738432 nsecs
active timers:
clock 1:
.index: 1
.resolution: 1 nsecs
.get_time: ktime_get
.offset: 0 nsecs
active timers:
#0: <f5a90ec8>, hrtimer_sched_tick, hrtimer_restart_sched_tick, swapper/0
# expires at 4246050084568 nsecs [in 3810696 nsecs]
#1: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, atd/2227
# expires at 4261010635003 nsecs [in 14964361131 nsecs]
#2: <f5a90ec8>, hrtimer_wakeup, do_nanosleep, smartd/2332
# expires at 5469485798970 nsecs [in 1223439525098 nsecs]
.expires_next : 4246050084568 nsecs
.hres_active : 1
.check_clocks : 0
.nr_events : 24043
.idle_tick : 4246046084568 nsecs
.tick_stopped : 0
.idle_jiffies : 986510
.idle_calls : 26360
.idle_sleeps : 22551
.idle_entrytime : 4246043874339 nsecs
.idle_sleeptime : 4170763761184 nsecs
tick_broadcast_mask: 00000003
event_broadcast_mask: 00000001
CPU#0's local event device:
Clock Event Device: lapic
capabilities: 0000000e
max_delta_ns: 807385544
min_delta_ns: 1443
mult: 44624025
shift: 32
set_next_event: lapic_next_event
set_mode: lapic_timer_setup
event_handler: hrtimer_interrupt
.installed: 1
.expires: 4246432689566 nsecs
CPU#1's local event device:
Clock Event Device: lapic
capabilities: 0000000e
max_delta_ns: 807385544
min_delta_ns: 1443
mult: 44624025
shift: 32
set_next_event: lapic_next_event
set_mode: lapic_timer_setup
event_handler: hrtimer_interrupt
.installed: 1
.expires: 4246050084568 nsecs
Clock Event Device: hpet
capabilities: 00000007
max_delta_ns: 2147483647
min_delta_ns: 3352
mult: 61496110
shift: 32
set_next_event: hpet_next_event
set_mode: hpet_set_mode
event_handler: handle_nextevt_broadcast
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-16 10:28:15 +01:00
|
|
|
/*
|
|
|
|
* Debugging: see timer_list.c
|
|
|
|
*/
|
|
|
|
cpumask_t *tick_get_broadcast_oneshot_mask(void)
|
|
|
|
{
|
|
|
|
return &tick_broadcast_oneshot_mask;
|
|
|
|
}
|
|
|
|
|
2007-02-16 10:28:03 +01:00
|
|
|
static int tick_broadcast_set_event(ktime_t expires, int force)
|
|
|
|
{
|
|
|
|
struct clock_event_device *bc = tick_broadcast_device.evtdev;
|
|
|
|
ktime_t now = ktime_get();
|
|
|
|
int res;
|
|
|
|
|
|
|
|
for(;;) {
|
|
|
|
res = clockevents_program_event(bc, expires, now);
|
|
|
|
if (!res || !force)
|
|
|
|
return res;
|
|
|
|
now = ktime_get();
|
|
|
|
expires = ktime_add(now, ktime_set(0, bc->min_delta_ns));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-03-17 00:25:52 +01:00
|
|
|
int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
|
|
|
|
{
|
|
|
|
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
|
2007-09-23 00:29:06 +02:00
|
|
|
return 0;
|
2007-03-17 00:25:52 +01:00
|
|
|
}
|
|
|
|
|
2007-02-16 10:28:03 +01:00
|
|
|
/*
|
|
|
|
* Reprogram the broadcast device:
|
|
|
|
*
|
|
|
|
* Called with tick_broadcast_lock held and interrupts disabled.
|
|
|
|
*/
|
|
|
|
static int tick_broadcast_reprogram(void)
|
|
|
|
{
|
|
|
|
ktime_t expires = { .tv64 = KTIME_MAX };
|
|
|
|
struct tick_device *td;
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Find the event which expires next:
|
|
|
|
*/
|
|
|
|
for (cpu = first_cpu(tick_broadcast_oneshot_mask); cpu != NR_CPUS;
|
|
|
|
cpu = next_cpu(cpu, tick_broadcast_oneshot_mask)) {
|
|
|
|
td = &per_cpu(tick_cpu_device, cpu);
|
|
|
|
if (td->evtdev->next_event.tv64 < expires.tv64)
|
|
|
|
expires = td->evtdev->next_event;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (expires.tv64 == KTIME_MAX)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return tick_broadcast_set_event(expires, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle oneshot mode broadcasting
|
|
|
|
*/
|
|
|
|
static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
|
|
|
|
{
|
|
|
|
struct tick_device *td;
|
|
|
|
cpumask_t mask;
|
|
|
|
ktime_t now;
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
spin_lock(&tick_broadcast_lock);
|
|
|
|
again:
|
|
|
|
dev->next_event.tv64 = KTIME_MAX;
|
|
|
|
mask = CPU_MASK_NONE;
|
|
|
|
now = ktime_get();
|
|
|
|
/* Find all expired events */
|
|
|
|
for (cpu = first_cpu(tick_broadcast_oneshot_mask); cpu != NR_CPUS;
|
|
|
|
cpu = next_cpu(cpu, tick_broadcast_oneshot_mask)) {
|
|
|
|
td = &per_cpu(tick_cpu_device, cpu);
|
|
|
|
if (td->evtdev->next_event.tv64 <= now.tv64)
|
|
|
|
cpu_set(cpu, mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Wakeup the cpus which have an expired event. The broadcast
|
|
|
|
* device is reprogrammed in the return from idle code.
|
|
|
|
*/
|
|
|
|
if (!tick_do_broadcast(mask)) {
|
|
|
|
/*
|
|
|
|
* The global event did not expire any CPU local
|
|
|
|
* events. This happens in dyntick mode, as the
|
|
|
|
* maximum PIT delta is quite small.
|
|
|
|
*/
|
|
|
|
if (tick_broadcast_reprogram())
|
|
|
|
goto again;
|
|
|
|
}
|
|
|
|
spin_unlock(&tick_broadcast_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Powerstate information: The system enters/leaves a state, where
|
|
|
|
* affected devices might stop
|
|
|
|
*/
|
|
|
|
void tick_broadcast_oneshot_control(unsigned long reason)
|
|
|
|
{
|
|
|
|
struct clock_event_device *bc, *dev;
|
|
|
|
struct tick_device *td;
|
|
|
|
unsigned long flags;
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tick_broadcast_lock, flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Periodic mode does not care about the enter/exit of power
|
|
|
|
* states
|
|
|
|
*/
|
|
|
|
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
bc = tick_broadcast_device.evtdev;
|
|
|
|
cpu = smp_processor_id();
|
|
|
|
td = &per_cpu(tick_cpu_device, cpu);
|
|
|
|
dev = td->evtdev;
|
|
|
|
|
|
|
|
if (!(dev->features & CLOCK_EVT_FEAT_C3STOP))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {
|
|
|
|
if (!cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
|
|
|
|
cpu_set(cpu, tick_broadcast_oneshot_mask);
|
|
|
|
clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
|
|
|
|
if (dev->next_event.tv64 < bc->next_event.tv64)
|
|
|
|
tick_broadcast_set_event(dev->next_event, 1);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
|
|
|
|
cpu_clear(cpu, tick_broadcast_oneshot_mask);
|
|
|
|
clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
|
|
|
|
if (dev->next_event.tv64 != KTIME_MAX)
|
|
|
|
tick_program_event(dev->next_event, 1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
}
|
|
|
|
|
2007-07-21 13:37:35 +02:00
|
|
|
/*
|
|
|
|
* Reset the one shot broadcast for a cpu
|
|
|
|
*
|
|
|
|
* Called with tick_broadcast_lock held
|
|
|
|
*/
|
|
|
|
static void tick_broadcast_clear_oneshot(int cpu)
|
|
|
|
{
|
|
|
|
cpu_clear(cpu, tick_broadcast_oneshot_mask);
|
|
|
|
}
|
|
|
|
|
2007-02-16 10:28:03 +01:00
|
|
|
/**
|
|
|
|
* tick_broadcast_setup_highres - setup the broadcast device for highres
|
|
|
|
*/
|
|
|
|
void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
|
|
|
|
{
|
|
|
|
if (bc->mode != CLOCK_EVT_MODE_ONESHOT) {
|
|
|
|
bc->event_handler = tick_handle_oneshot_broadcast;
|
|
|
|
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
|
|
|
|
bc->next_event.tv64 = KTIME_MAX;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Select oneshot operating mode for the broadcast device
|
|
|
|
*/
|
|
|
|
void tick_broadcast_switch_to_oneshot(void)
|
|
|
|
{
|
|
|
|
struct clock_event_device *bc;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tick_broadcast_lock, flags);
|
|
|
|
|
|
|
|
tick_broadcast_device.mode = TICKDEV_MODE_ONESHOT;
|
|
|
|
bc = tick_broadcast_device.evtdev;
|
|
|
|
if (bc)
|
|
|
|
tick_broadcast_setup_oneshot(bc);
|
|
|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove a dead CPU from broadcasting
|
|
|
|
*/
|
|
|
|
void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned int cpu = *cpup;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tick_broadcast_lock, flags);
|
|
|
|
|
2007-09-16 15:36:43 +02:00
|
|
|
/*
|
|
|
|
* Clear the broadcast mask flag for the dead cpu, but do not
|
|
|
|
* stop the broadcast device!
|
|
|
|
*/
|
2007-02-16 10:28:03 +01:00
|
|
|
cpu_clear(cpu, tick_broadcast_oneshot_mask);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|