idle.c (688d794c4c3f8b08c814381ee2edd3ede5856056) idle.c (799fef06123f86ff69cf754f996219e6ad1678f8)
1/*
2 * Idle daemon for PowerPC. Idle daemon will handle any action
3 * that needs to be taken when the system becomes idle.
4 *
5 * Originally written by Cort Dougan (cort@cs.nmt.edu).
6 * Subsequent 32-bit hacking by Tom Rini, Armin Kuster,
7 * Paul Mackerras and others.
8 *

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28
29#include <asm/processor.h>
30#include <asm/cputable.h>
31#include <asm/time.h>
32#include <asm/machdep.h>
33#include <asm/runlatch.h>
34#include <asm/smp.h>
35
1/*
2 * Idle daemon for PowerPC. Idle daemon will handle any action
3 * that needs to be taken when the system becomes idle.
4 *
5 * Originally written by Cort Dougan (cort@cs.nmt.edu).
6 * Subsequent 32-bit hacking by Tom Rini, Armin Kuster,
7 * Paul Mackerras and others.
8 *

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28
29#include <asm/processor.h>
30#include <asm/cputable.h>
31#include <asm/time.h>
32#include <asm/machdep.h>
33#include <asm/runlatch.h>
34#include <asm/smp.h>
35
36#ifdef CONFIG_HOTPLUG_CPU
37#define cpu_should_die() cpu_is_offline(smp_processor_id())
38#else
39#define cpu_should_die() 0
40#endif
41
42unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
43EXPORT_SYMBOL(cpuidle_disable);
44
45static int __init powersave_off(char *arg)
46{
47 ppc_md.power_save = NULL;
48 cpuidle_disable = IDLE_POWERSAVE_OFF;
49 return 0;
50}
51__setup("powersave=off", powersave_off);
52
36
37unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
38EXPORT_SYMBOL(cpuidle_disable);
39
40static int __init powersave_off(char *arg)
41{
42 ppc_md.power_save = NULL;
43 cpuidle_disable = IDLE_POWERSAVE_OFF;
44 return 0;
45}
46__setup("powersave=off", powersave_off);
47
53/*
54 * The body of the idle task.
55 */
56void cpu_idle(void)
48#ifdef CONFIG_HOTPLUG_CPU
49void arch_cpu_idle_dead(void)
57{
50{
58 set_thread_flag(TIF_POLLING_NRFLAG);
59 while (1) {
60 tick_nohz_idle_enter();
61 rcu_idle_enter();
51 sched_preempt_enable_no_resched();
52 cpu_die();
53}
54#endif
62
55
63 while (!need_resched() && !cpu_should_die()) {
64 ppc64_runlatch_off();
56void arch_cpu_idle(void)
57{
58 ppc64_runlatch_off();
65
59
66 if (ppc_md.power_save) {
67 clear_thread_flag(TIF_POLLING_NRFLAG);
68 /*
69 * smp_mb is so clearing of TIF_POLLING_NRFLAG
70 * is ordered w.r.t. need_resched() test.
71 */
72 smp_mb();
73 local_irq_disable();
74
75 /* Don't trace irqs off for idle */
76 stop_critical_timings();
77
78 /* check again after disabling irqs */
79 if (!need_resched() && !cpu_should_die())
80 ppc_md.power_save();
81
82 start_critical_timings();
83
84 /* Some power_save functions return with
85 * interrupts enabled, some don't.
86 */
87 if (irqs_disabled())
88 local_irq_enable();
89 set_thread_flag(TIF_POLLING_NRFLAG);
90
91 } else {
92 /*
93 * Go into low thread priority and possibly
94 * low power mode.
95 */
96 HMT_low();
97 HMT_very_low();
98 }
99 }
100
101 HMT_medium();
102 ppc64_runlatch_on();
103 rcu_idle_exit();
104 tick_nohz_idle_exit();
105 if (cpu_should_die()) {
106 sched_preempt_enable_no_resched();
107 cpu_die();
108 }
109 schedule_preempt_disabled();
60 if (ppc_md.power_save) {
61 ppc_md.power_save();
62 /*
63 * Some power_save functions return with
64 * interrupts enabled, some don't.
65 */
66 if (irqs_disabled())
67 local_irq_enable();
68 } else {
69 local_irq_enable();
70 /*
71 * Go into low thread priority and possibly
72 * low power mode.
73 */
74 HMT_low();
75 HMT_very_low();
110 }
76 }
77
78 HMT_medium();
79 ppc64_runlatch_on();
111}
112
113int powersave_nap;
114
115#ifdef CONFIG_SYSCTL
116/*
117 * Register the sysctl to set/clear powersave_nap.
118 */

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81
82int powersave_nap;
83
84#ifdef CONFIG_SYSCTL
85/*
86 * Register the sysctl to set/clear powersave_nap.
87 */

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