ARM64 / cpuidle: Use new cpuidle macro for entering retention state
CPU_PM_CPU_IDLE_ENTER_RETENTION skips calling cpu_pm_enter() and cpu_pm_exit(). By not calling cpu_pm functions in idle entry/exit paths we can reduce the latency involved in entering and exiting the low power idle state. On ARM64 based Qualcomm server platform we measured below overhead for calling cpu_pm_enter and cpu_pm_exit for retention states. workload: stress --hdd #CPUs --hdd-bytes 32M -t 30 Average overhead of cpu_pm_enter - 1.2us Average overhead of cpu_pm_exit - 3.1us Acked-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -47,6 +47,8 @@ int arm_cpuidle_suspend(int index)
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#include <acpi/processor.h>
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#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
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int acpi_processor_ffh_lpi_probe(unsigned int cpu)
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{
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return arm_cpuidle_init(cpu);
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@ -54,6 +56,10 @@ int acpi_processor_ffh_lpi_probe(unsigned int cpu)
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int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
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{
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return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);
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if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags))
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return CPU_PM_CPU_IDLE_ENTER_RETENTION(arm_cpuidle_suspend,
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lpi->index);
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else
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return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);
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}
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#endif
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