add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/kernel/idle.c
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@@ -1,3 +1,4 @@
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+// 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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@@ -12,11 +13,6 @@
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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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@@ -41,17 +37,9 @@
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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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+	return 1;
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 }
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 __setup("powersave=off", powersave_off);
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-
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-#ifdef CONFIG_HOTPLUG_CPU
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-void arch_cpu_idle_dead(void)
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-{
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-	sched_preempt_enable_no_resched();
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-	cpu_die();
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-}
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-#endif
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 void arch_cpu_idle(void)
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 {
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@@ -64,9 +52,9 @@
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 		 * interrupts enabled, some don't.
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 		 */
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 		if (irqs_disabled())
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-			local_irq_enable();
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+			raw_local_irq_enable();
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 	} else {
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-		local_irq_enable();
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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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@@ -81,6 +69,31 @@
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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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+
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+	if (!powersave_nap)
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+		return;
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+
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+	if (!prep_irq_for_idle())
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+		return;
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+
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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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+
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+	power4_idle_nap();
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+
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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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+
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 #ifdef CONFIG_SYSCTL
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 /*
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  * Register the sysctl to set/clear powersave_nap.