89b3098703
Current arch_cpu_idle() is called with IRQs disabled, but will return with IRQs enabled. However, the very first thing the generic code does after calling arch_cpu_idle() is raw_local_irq_disable(). This means that architectures that can idle with IRQs disabled end up doing a pointless 'enable-disable' dance. Therefore, push this IRQ disabling into the idle function, meaning that those architectures can avoid the pointless IRQ state flipping. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Tony Lindgren <tony@atomide.com> Tested-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Acked-by: Mark Rutland <mark.rutland@arm.com> [arm64] Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Guo Ren <guoren@kernel.org> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20230112195540.618076436@infradead.org
46 lines
893 B
C
46 lines
893 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Low-level idle sequences
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*/
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#include <linux/cpu.h>
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#include <linux/irqflags.h>
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#include <asm/barrier.h>
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#include <asm/cpuidle.h>
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#include <asm/cpufeature.h>
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#include <asm/sysreg.h>
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/*
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* cpu_do_idle()
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*
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* Idle the processor (wait for interrupt).
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*
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* If the CPU supports priority masking we must do additional work to
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* ensure that interrupts are not masked at the PMR (because the core will
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* not wake up if we block the wake up signal in the interrupt controller).
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*/
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void noinstr cpu_do_idle(void)
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{
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struct arm_cpuidle_irq_context context;
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arm_cpuidle_save_irq_context(&context);
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dsb(sy);
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wfi();
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arm_cpuidle_restore_irq_context(&context);
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}
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/*
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* This is our default idle handler.
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*/
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void noinstr arch_cpu_idle(void)
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{
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/*
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* This should do all the clock switching and wait for interrupt
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* tricks
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*/
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cpu_do_idle();
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}
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