forked from luck/tmp_suning_uos_patched
437a58db57
This also deletes the now-unused Makefiles under arch/ppc64. Both of the files moved over could use some merging, but for now I have moved them as-is and arranged for them to be used only in 64-bit kernels. For 32-bit kernels we still use arch/ppc/kernel/idle.c and drivers/char/generic_nvram.c as before. Signed-off-by: Paul Mackerras <paulus@samba.org>
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
/*
|
|
* 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)
|
|
*
|
|
* 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>
|
|
*
|
|
* 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/config.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/sysctl.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/time.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/smp.h>
|
|
|
|
extern void power4_idle(void);
|
|
|
|
void default_idle(void)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
while (1) {
|
|
if (!need_resched()) {
|
|
while (!need_resched() && !cpu_is_offline(cpu)) {
|
|
ppc64_runlatch_off();
|
|
|
|
/*
|
|
* Go into low thread priority and possibly
|
|
* low power mode.
|
|
*/
|
|
HMT_low();
|
|
HMT_very_low();
|
|
}
|
|
|
|
HMT_medium();
|
|
}
|
|
|
|
ppc64_runlatch_on();
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
|
|
cpu_die();
|
|
}
|
|
}
|
|
|
|
void native_idle(void)
|
|
{
|
|
while (1) {
|
|
ppc64_runlatch_off();
|
|
|
|
if (!need_resched())
|
|
power4_idle();
|
|
|
|
if (need_resched()) {
|
|
ppc64_runlatch_on();
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
|
|
if (cpu_is_offline(smp_processor_id()) &&
|
|
system_state == SYSTEM_RUNNING)
|
|
cpu_die();
|
|
}
|
|
}
|
|
|
|
void cpu_idle(void)
|
|
{
|
|
BUG_ON(NULL == ppc_md.idle_loop);
|
|
ppc_md.idle_loop();
|
|
}
|
|
|
|
int powersave_nap;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
/*
|
|
* Register the sysctl to set/clear powersave_nap.
|
|
*/
|
|
static ctl_table powersave_nap_ctl_table[]={
|
|
{
|
|
.ctl_name = KERN_PPC_POWERSAVE_NAP,
|
|
.procname = "powersave-nap",
|
|
.data = &powersave_nap,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{ 0, },
|
|
};
|
|
static ctl_table powersave_nap_sysctl_root[] = {
|
|
{ 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
|
|
{ 0,},
|
|
};
|
|
|
|
static int __init
|
|
register_powersave_nap_sysctl(void)
|
|
{
|
|
register_sysctl_table(powersave_nap_sysctl_root, 0);
|
|
|
|
return 0;
|
|
}
|
|
__initcall(register_powersave_nap_sysctl);
|
|
#endif
|