129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
/*
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* Idle daemon for PowerPC. Idle daemon will handle any action
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* that needs to be taken when the system becomes idle.
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*
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* Originally Written by Cort Dougan (cort@cs.nmt.edu)
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*
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* iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
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*
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* Additional shared processor, SMT, and firmware support
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* Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <linux/sysctl.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/cputable.h>
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#include <asm/time.h>
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#include <asm/systemcfg.h>
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#include <asm/machdep.h>
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extern void power4_idle(void);
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int default_idle(void)
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{
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long oldval;
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unsigned int cpu = smp_processor_id();
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while (1) {
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oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
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if (!oldval) {
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set_thread_flag(TIF_POLLING_NRFLAG);
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while (!need_resched() && !cpu_is_offline(cpu)) {
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ppc64_runlatch_off();
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/*
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* Go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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}
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HMT_medium();
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clear_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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set_need_resched();
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}
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ppc64_runlatch_on();
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schedule();
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if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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int native_idle(void)
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{
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while (1) {
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ppc64_runlatch_off();
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if (!need_resched())
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power4_idle();
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if (need_resched()) {
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ppc64_runlatch_on();
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schedule();
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}
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if (cpu_is_offline(smp_processor_id()) &&
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system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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void cpu_idle(void)
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{
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BUG_ON(NULL == ppc_md.idle_loop);
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ppc_md.idle_loop();
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}
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int powersave_nap;
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#ifdef CONFIG_SYSCTL
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/*
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* Register the sysctl to set/clear powersave_nap.
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*/
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static ctl_table powersave_nap_ctl_table[]={
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{
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.ctl_name = KERN_PPC_POWERSAVE_NAP,
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.procname = "powersave-nap",
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.data = &powersave_nap,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{ 0, },
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};
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static ctl_table powersave_nap_sysctl_root[] = {
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{ 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
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{ 0,},
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};
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static int __init
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register_powersave_nap_sysctl(void)
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{
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register_sysctl_table(powersave_nap_sysctl_root, 0);
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return 0;
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}
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__initcall(register_powersave_nap_sysctl);
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#endif
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