diff options
Diffstat (limited to 'arch/powerpc/kernel/idle.c')
| -rw-r--r-- | arch/powerpc/kernel/idle.c | 59 |
1 files changed, 31 insertions, 28 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c index d7216c9abda1..e527cd3ef128 100644 --- a/arch/powerpc/kernel/idle.c +++ b/arch/powerpc/kernel/idle.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Idle daemon for PowerPC. Idle daemon will handle any action * that needs to be taken when the system becomes idle. @@ -12,11 +13,6 @@ * 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> @@ -41,18 +37,10 @@ static int __init powersave_off(char *arg) { ppc_md.power_save = NULL; cpuidle_disable = IDLE_POWERSAVE_OFF; - return 0; + return 1; } __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(); @@ -63,10 +51,9 @@ void arch_cpu_idle(void) * Some power_save functions return with * interrupts enabled, some don't. */ - if (irqs_disabled()) - local_irq_enable(); + if (!irqs_disabled()) + raw_local_irq_disable(); } else { - local_irq_enable(); /* * Go into low thread priority and possibly * low power mode. @@ -81,11 +68,36 @@ void arch_cpu_idle(void) int powersave_nap; +#ifdef CONFIG_PPC_970_NAP +void power4_idle(void) +{ + if (!cpu_has_feature(CPU_FTR_CAN_NAP)) + return; + + if (!powersave_nap) + return; + + if (!prep_irq_for_idle()) + return; + + if (cpu_has_feature(CPU_FTR_ALTIVEC)) + asm volatile(PPC_DSSALL " ; sync" ::: "memory"); + + power4_idle_nap(); + + /* + * power4_idle_nap returns with interrupts enabled (soft and hard). + * to our caller with interrupts enabled (soft and hard). Our caller + * can cope with either interrupts disabled or enabled upon return. + */ +} +#endif + #ifdef CONFIG_SYSCTL /* * Register the sysctl to set/clear powersave_nap. */ -static struct ctl_table powersave_nap_ctl_table[] = { +static const struct ctl_table powersave_nap_ctl_table[] = { { .procname = "powersave-nap", .data = &powersave_nap, @@ -93,21 +105,12 @@ static struct ctl_table powersave_nap_ctl_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, - {} -}; -static struct 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); + register_sysctl("kernel", powersave_nap_ctl_table); return 0; } |