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Subject[RFC PATCH] Add IPI entry for CPU UP
Date
In some ARM SOCs, IPI interrupt is used for hotplug in one cpu, that is,
sending a IPI to the core in WFI and powerdown status. So Add a IPI
entry for handle this kind of cpu up interrupt

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@spreadtrum.com>
---
arch/arm64/kernel/smp.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index b1adc51..20e63c9 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -70,6 +70,7 @@ enum ipi_msg_type {
IPI_CPU_STOP,
IPI_TIMER,
IPI_IRQ_WORK,
+ IPI_CPU_UP,
};

/*
@@ -627,6 +628,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
S(IPI_CPU_STOP, "CPU stop interrupts"),
S(IPI_TIMER, "Timer broadcast interrupts"),
S(IPI_IRQ_WORK, "IRQ work interrupts"),
+ S(IPI_CPU_UP, "Hotplug cpu up by ipi"),
};

static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
@@ -746,6 +748,8 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
irq_exit();
break;
#endif
+ case IPI_CPU_UP:
+ break;

default:
pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);
@@ -798,3 +802,9 @@ int setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
}
+
+void smp_send_cpuup(int cpu)
+{
+ smp_cross_call(cpumask_of(cpu), IPI_CPU_UP);
+}
+
--
1.7.9.5
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