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d51f86cfd8
The dssall ("Data Stream Stop All") instruction is obsolete altogether
with other Data Cache Instructions since ISA 2.03 (year 2006).
LLVM IAS does not support it but PPC970 seems to be using it.
This switches dssall to .long as there is no much point in fixing LLVM.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-6-aik@ozlabs.ru
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/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/runlatch.h>
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#include <asm/smp.h>
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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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void arch_cpu_idle(void)
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{
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ppc64_runlatch_off();
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if (ppc_md.power_save) {
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ppc_md.power_save();
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/*
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* Some power_save functions return with
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* interrupts enabled, some don't.
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*/
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if (irqs_disabled())
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raw_local_irq_enable();
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} else {
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raw_local_irq_enable();
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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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ppc64_runlatch_on();
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}
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int powersave_nap;
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#ifdef CONFIG_PPC_970_NAP
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void power4_idle(void)
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{
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if (!cpu_has_feature(CPU_FTR_CAN_NAP))
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return;
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if (!powersave_nap)
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return;
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if (!prep_irq_for_idle())
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return;
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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asm volatile(PPC_DSSALL " ; sync" ::: "memory");
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power4_idle_nap();
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/*
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* power4_idle_nap returns with interrupts enabled (soft and hard).
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* to our caller with interrupts enabled (soft and hard). Our caller
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* can cope with either interrupts disabled or enabled upon return.
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*/
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}
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#endif
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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 struct 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 struct 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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