/* * Idle daemon for PowerPC. Idle daemon will handle any action * that needs to be taken when the system becomes idle. * * Originally written by Cort Dougan (cort@cs.nmt.edu). * Subsequent 32-bit hacking by Tom Rini, Armin Kuster, * Paul Mackerras and others. * * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com> * * Additional shared processor, SMT, and firmware support * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com> * * 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/sched.h> #include <linux/kernel.h> #include <linux/smp.h> #include <linux/cpu.h> #include <linux/sysctl.h> #include <linux/tick.h> #include <asm/processor.h> #include <asm/cputable.h> #include <asm/time.h> #include <asm/machdep.h> #include <asm/runlatch.h> #include <asm/smp.h> unsigned long cpuidle_disable = IDLE_NO_OVERRIDE; EXPORT_SYMBOL(cpuidle_disable); static int __init powersave_off(char *arg) { ppc_md.power_save = NULL; cpuidle_disable = IDLE_POWERSAVE_OFF; return 0; } __setup("powersave=off", powersave_off); #ifdef CONFIG_HOTPLUG_CPU void arch_cpu_idle_dead(void) { sched_preempt_enable_no_resched(); cpu_die(); } #endif void arch_cpu_idle(void) { ppc64_runlatch_off(); if (ppc_md.power_save) { ppc_md.power_save(); /* * Some power_save functions return with * interrupts enabled, some don't. */ if (irqs_disabled()) local_irq_enable(); } else { local_irq_enable(); /* * Go into low thread priority and possibly * low power mode. */ HMT_low(); HMT_very_low(); } HMT_medium(); ppc64_runlatch_on(); } int powersave_nap; #ifdef CONFIG_SYSCTL /* * Register the sysctl to set/clear powersave_nap. */ static ctl_table powersave_nap_ctl_table[]={ { .procname = "powersave-nap", .data = &powersave_nap, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, {} }; static ctl_table powersave_nap_sysctl_root[] = { { .procname = "kernel", .mode = 0555, .child = powersave_nap_ctl_table, }, {} }; static int __init register_powersave_nap_sysctl(void) { register_sysctl_table(powersave_nap_sysctl_root); return 0; } __initcall(register_powersave_nap_sysctl); #endif