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arm64: Allow IPI_WAKEUP to be used outside of the ACPI parking protocol

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An empty IPI is useful for cpuidle to wake sleeping CPUs without causing
them to do unnecessary work upon receipt of the IPI. IPI_WAKEUP fills
this use-case nicely, so let it be used outside of the ACPI parking
protocol.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: azrim <mirzaspc@gmail.com>
This commit is contained in:
Sultan Alsawaf 2020-04-23 14:38:39 -07:00 committed by azrim
parent 3142fce40a
commit a4daa912eb
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GPG Key ID: 497F8FB059B45D1C
2 changed files with 0 additions and 14 deletions
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7
arch/arm64/include/asm/smp.h
View File

@ -95,14 +95,7 @@ extern void secondary_entry(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
#else
static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
BUILD_BUG();
}
#endif
extern int __cpu_disable(void);

7
arch/arm64/kernel/smp.c
View File

@ -798,12 +798,10 @@ void arch_send_call_function_single_ipi(int cpu)
smp_cross_call_common(cpumask_of(cpu), IPI_CALL_FUNC);
}
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
smp_cross_call_common(mask, IPI_WAKEUP);
}
#endif
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
@ -921,13 +919,8 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
break;
#endif
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
case IPI_WAKEUP:
WARN_ONCE(!acpi_parking_protocol_valid(cpu),
"CPU%u: Wake-up IPI outside the ACPI parking protocol\n",
cpu);
break;
#endif
default:
pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);