1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/smp.h>
21#include <linux/cpu.h>
22#include <linux/sysctl.h>
23#include <linux/tick.h>
24
25#include <asm/processor.h>
26#include <asm/cputable.h>
27#include <asm/time.h>
28#include <asm/machdep.h>
29#include <asm/runlatch.h>
30#include <asm/smp.h>
31
32
33unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
34EXPORT_SYMBOL(cpuidle_disable);
35
36static int __init powersave_off(char *arg)
37{
38 ppc_md.power_save = NULL;
39 cpuidle_disable = IDLE_POWERSAVE_OFF;
40 return 0;
41}
42__setup("powersave=off", powersave_off);
43
44#ifdef CONFIG_HOTPLUG_CPU
45void arch_cpu_idle_dead(void)
46{
47 sched_preempt_enable_no_resched();
48 cpu_die();
49}
50#endif
51
52void arch_cpu_idle(void)
53{
54 ppc64_runlatch_off();
55
56 if (ppc_md.power_save) {
57 ppc_md.power_save();
58
59
60
61
62 if (irqs_disabled())
63 local_irq_enable();
64 } else {
65 local_irq_enable();
66
67
68
69
70 HMT_low();
71 HMT_very_low();
72 }
73
74 HMT_medium();
75 ppc64_runlatch_on();
76}
77
78int powersave_nap;
79
80#ifdef CONFIG_SYSCTL
81
82
83
84static struct ctl_table powersave_nap_ctl_table[] = {
85 {
86 .procname = "powersave-nap",
87 .data = &powersave_nap,
88 .maxlen = sizeof(int),
89 .mode = 0644,
90 .proc_handler = proc_dointvec,
91 },
92 {}
93};
94static struct ctl_table powersave_nap_sysctl_root[] = {
95 {
96 .procname = "kernel",
97 .mode = 0555,
98 .child = powersave_nap_ctl_table,
99 },
100 {}
101};
102
103static int __init
104register_powersave_nap_sysctl(void)
105{
106 register_sysctl_table(powersave_nap_sysctl_root);
107
108 return 0;
109}
110__initcall(register_powersave_nap_sysctl);
111#endif
112