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ARM: smp: export pending IPI state

Browse source 
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: Lina Iyer <ilina@codeaurora.org>
This commit is contained in:
Lina Iyer 2019-07-24 15:37:21 -06:00 • committed by Maulik Shah
commit 2f5cb5c667
3 changed files with 60 additions and 0 deletions
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17
arch/arm/kernel/smp.c
View file

@ -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);
}

17
arch/arm64/kernel/smp.c
View file

@ -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);
}

26
include/linux/smp.h
View file

@ -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 */
/**