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Commit 2f5cb5c6 authored by Lina Iyer's avatar Lina Iyer Committed by Maulik Shah
Browse files

ARM: smp: export pending IPI state 



Record and export if an IPI is pending on the current CPU. Knowing if an
IPI is pending helps make better idle state determinations.

Change-Id: I92ab0aaeb3162cd312aa00a4e3eb978be2ad8efc
Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
parent 8790fa13

arch/arm/kernel/smp.c

+17 −0
Original line number Diff line number Diff line
@@ -52,6 +52,11 @@ 
#define CREATE_TRACE_POINTS

#include <trace/events/ipi.h>



#ifdef CONFIG_QGKI_LPM_IPI_CHECK

DEFINE_PER_CPU(bool, pending_ipi);

EXPORT_PER_CPU_SYMBOL(pending_ipi);

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



/*

 * as from 2.5, kernels no longer have an init_tasks structure

 * so we need some other way of telling a new secondary core
@@ -521,6 +526,13 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = { 


static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)

{

#ifdef CONFIG_QGKI_LPM_IPI_CHECK

	unsigned int cpu;



	for_each_cpu(cpu, target)

		per_cpu(pending_ipi, cpu) = true;

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



	trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);

	__smp_cross_call(target, ipinr);

}
@@ -695,6 +707,11 @@ void handle_IPI(int ipinr, struct pt_regs *regs) 


	if ((unsigned)ipinr < NR_IPI)

		trace_ipi_exit_rcuidle(ipi_types[ipinr]);



#ifdef CONFIG_QGKI_LPM_IPI_CHECK

	this_cpu_write(pending_ipi, false);

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



	set_irq_regs(old_regs);

}

arch/arm64/kernel/smp.c

+17 −0
Original line number Diff line number Diff line
@@ -57,6 +57,11 @@ 
DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);

EXPORT_PER_CPU_SYMBOL(cpu_number);



#ifdef CONFIG_QGKI_LPM_IPI_CHECK

DEFINE_PER_CPU(bool, pending_ipi);

EXPORT_PER_CPU_SYMBOL(pending_ipi);

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



/*

 * as from 2.5, kernels no longer have an init_tasks structure

 * so we need some other way of telling a new secondary core
@@ -772,6 +777,13 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = { 


static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)

{

#ifdef CONFIG_QGKI_LPM_IPI_CHECK

	unsigned int cpu;



	for_each_cpu(cpu, target)

		per_cpu(pending_ipi, cpu) = true;

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



	trace_ipi_raise(target, ipi_types[ipinr]);

	__smp_cross_call(target, ipinr);

}
@@ -957,6 +969,11 @@ void handle_IPI(int ipinr, struct pt_regs *regs) 


	if ((unsigned)ipinr < NR_IPI)

		trace_ipi_exit_rcuidle(ipi_types[ipinr]);



#ifdef CONFIG_QGKI_LPM_IPI_CHECK

	this_cpu_write(pending_ipi, false);

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



	set_irq_regs(old_regs);

}

include/linux/smp.h

+26 −0
Original line number Diff line number Diff line
@@ -136,6 +136,27 @@ static inline int get_boot_cpu_id(void) 
	return __boot_cpu_id;

}



#ifdef CONFIG_QGKI_LPM_IPI_CHECK

DECLARE_PER_CPU(bool, pending_ipi);



static inline bool is_IPI_pending(const struct cpumask *mask)

{

	unsigned int cpu;



	for_each_cpu(cpu, mask) {

		if (per_cpu(pending_ipi, cpu))

			return true;

	}



	return false;

}

#else

static inline bool is_IPI_pending(const struct cpumask *mask)

{

	return false;

}

#endif /* CONFIG_QGKI_LPM_IPI_CHECK */



#else /* !SMP */



static inline void smp_send_stop(void) { }
@@ -178,6 +199,11 @@ static inline int get_boot_cpu_id(void) 
	return 0;

}



static inline bool is_IPI_pending(const struct cpumask *mask)

{

	return false;

}



#endif /* !SMP */



/**