idle.c (5c34202b8bf942da411b6599668a76b07449bbfd) idle.c (1ad749980a5fda46f7ec920d8409ddcc89b38714)
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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19 * 2 of the License, or (at your option) any later version.
20 */
21
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/smp.h>
25#include <linux/cpu.h>
26#include <linux/sysctl.h>
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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19 * 2 of the License, or (at your option) any later version.
20 */
21
22#include <linux/sched.h>
23#include <linux/kernel.h>
24#include <linux/smp.h>
25#include <linux/cpu.h>
26#include <linux/sysctl.h>
27#include <linux/tick.h>
27
28#include <asm/system.h>
29#include <asm/processor.h>
30#include <asm/cputable.h>
31#include <asm/time.h>
32#include <asm/machdep.h>
33#include <asm/smp.h>
34

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54 */
55void cpu_idle(void)
56{
57 if (ppc_md.idle_loop)
58 ppc_md.idle_loop(); /* doesn't return */
59
60 set_thread_flag(TIF_POLLING_NRFLAG);
61 while (1) {
28
29#include <asm/system.h>
30#include <asm/processor.h>
31#include <asm/cputable.h>
32#include <asm/time.h>
33#include <asm/machdep.h>
34#include <asm/smp.h>
35

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55 */
56void cpu_idle(void)
57{
58 if (ppc_md.idle_loop)
59 ppc_md.idle_loop(); /* doesn't return */
60
61 set_thread_flag(TIF_POLLING_NRFLAG);
62 while (1) {
63 tick_nohz_stop_sched_tick();
62 while (!need_resched() && !cpu_should_die()) {
63 ppc64_runlatch_off();
64
65 if (ppc_md.power_save) {
66 clear_thread_flag(TIF_POLLING_NRFLAG);
67 /*
68 * smp_mb is so clearing of TIF_POLLING_NRFLAG
69 * is ordered w.r.t. need_resched() test.

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85 */
86 HMT_low();
87 HMT_very_low();
88 }
89 }
90
91 HMT_medium();
92 ppc64_runlatch_on();
64 while (!need_resched() && !cpu_should_die()) {
65 ppc64_runlatch_off();
66
67 if (ppc_md.power_save) {
68 clear_thread_flag(TIF_POLLING_NRFLAG);
69 /*
70 * smp_mb is so clearing of TIF_POLLING_NRFLAG
71 * is ordered w.r.t. need_resched() test.

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87 */
88 HMT_low();
89 HMT_very_low();
90 }
91 }
92
93 HMT_medium();
94 ppc64_runlatch_on();
95 tick_nohz_restart_sched_tick();
93 if (cpu_should_die())
94 cpu_die();
95 preempt_enable_no_resched();
96 schedule();
97 preempt_disable();
98 }
99}
100

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97 cpu_die();
98 preempt_enable_no_resched();
99 schedule();
100 preempt_disable();
101 }
102}
103

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