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e4e88f31bc
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (185 commits) powerpc: fix compile error with 85xx/p1010rdb.c powerpc: fix compile error with 85xx/p1023_rds.c powerpc/fsl: add MSI support for the Freescale hypervisor arch/powerpc/sysdev/fsl_rmu.c: introduce missing kfree powerpc/fsl: Add support for Integrated Flash Controller powerpc/fsl: update compatiable on fsl 16550 uart nodes powerpc/85xx: fix PCI and localbus properties in p1022ds.dts powerpc/85xx: re-enable ePAPR byte channel driver in corenet32_smp_defconfig powerpc/fsl: Update defconfigs to enable some standard FSL HW features powerpc: Add TBI PHY node to first MDIO bus sbc834x: put full compat string in board match check powerpc/fsl-pci: Allow 64-bit PCIe devices to DMA to any memory address powerpc: Fix unpaired probe_hcall_entry and probe_hcall_exit offb: Fix setting of the pseudo-palette for >8bpp offb: Add palette hack for qemu "standard vga" framebuffer offb: Fix bug in calculating requested vram size powerpc/boot: Change the WARN to INFO for boot wrapper overlap message powerpc/44x: Fix build error on currituck platform powerpc/boot: Change the load address for the wrapper to fit the kernel powerpc/44x: Enable CRASH_DUMP for 440x ... Fix up a trivial conflict in arch/powerpc/include/asm/cputime.h due to the additional sparse-checking code for cputime_t.
176 lines
3.9 KiB
C
176 lines
3.9 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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* Subsequent 32-bit hacking by Tom Rini, Armin Kuster,
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* Paul Mackerras and others.
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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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* 32-bit and 64-bit versions merged by Paul Mackerras <paulus@samba.org>
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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/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 <linux/tick.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/machdep.h>
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#include <asm/smp.h>
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#ifdef CONFIG_HOTPLUG_CPU
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#define cpu_should_die() cpu_is_offline(smp_processor_id())
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#else
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#define cpu_should_die() 0
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#endif
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unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
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EXPORT_SYMBOL(cpuidle_disable);
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static int __init powersave_off(char *arg)
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{
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ppc_md.power_save = NULL;
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cpuidle_disable = IDLE_POWERSAVE_OFF;
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return 0;
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}
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__setup("powersave=off", powersave_off);
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#if defined(CONFIG_PPC_PSERIES) && defined(CONFIG_TRACEPOINTS)
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static const bool idle_uses_rcu = 1;
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#else
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static const bool idle_uses_rcu;
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#endif
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/*
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* The body of the idle task.
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*/
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void cpu_idle(void)
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{
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if (ppc_md.idle_loop)
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ppc_md.idle_loop(); /* doesn't return */
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set_thread_flag(TIF_POLLING_NRFLAG);
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while (1) {
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tick_nohz_idle_enter();
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if (!idle_uses_rcu)
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rcu_idle_enter();
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while (!need_resched() && !cpu_should_die()) {
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ppc64_runlatch_off();
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if (ppc_md.power_save) {
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clear_thread_flag(TIF_POLLING_NRFLAG);
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/*
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* smp_mb is so clearing of TIF_POLLING_NRFLAG
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* is ordered w.r.t. need_resched() test.
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*/
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smp_mb();
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local_irq_disable();
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/* Don't trace irqs off for idle */
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stop_critical_timings();
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/* check again after disabling irqs */
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if (!need_resched() && !cpu_should_die())
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ppc_md.power_save();
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start_critical_timings();
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local_irq_enable();
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set_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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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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}
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HMT_medium();
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ppc64_runlatch_on();
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if (!idle_uses_rcu)
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rcu_idle_exit();
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tick_nohz_idle_exit();
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preempt_enable_no_resched();
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if (cpu_should_die())
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cpu_die();
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schedule();
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preempt_disable();
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}
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}
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/*
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* cpu_idle_wait - Used to ensure that all the CPUs come out of the old
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* idle loop and start using the new idle loop.
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* Required while changing idle handler on SMP systems.
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* Caller must have changed idle handler to the new value before the call.
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* This window may be larger on shared systems.
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*/
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void cpu_idle_wait(void)
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{
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int cpu;
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smp_mb();
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/* kick all the CPUs so that they exit out of old idle routine */
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get_online_cpus();
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for_each_online_cpu(cpu) {
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if (cpu != smp_processor_id())
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smp_send_reschedule(cpu);
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}
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put_online_cpus();
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}
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EXPORT_SYMBOL_GPL(cpu_idle_wait);
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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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.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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{}
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};
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static ctl_table powersave_nap_sysctl_root[] = {
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{
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.procname = "kernel",
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.mode = 0555,
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.child = powersave_nap_ctl_table,
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},
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{}
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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);
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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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