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Commit 716b45b3 authored by Abhimanyu Kapur's avatar Abhimanyu Kapur
Browse files

arm64: smp: Add wakeup IPI support 



Add support for IPI_WAKEUP which is used by hotplug code
path to wake up CPU from low power states.

Change-Id: I258d05e109a377613064624a5bfda21ab8ea9869
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent 8eaa5187

arch/arm64/include/asm/hardirq.h

+1 −1
Original line number Diff line number Diff line
@@ -20,7 +20,7 @@ 
#include <linux/threads.h>

#include <asm/irq.h>



#define NR_IPI	5

#define NR_IPI	6



typedef struct {

	unsigned int __softirq_pending;

arch/arm64/include/asm/smp.h

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ 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);

extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);



extern int __cpu_disable(void);

arch/arm64/kernel/smp.c

+9 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ enum ipi_msg_type { 
	IPI_CALL_FUNC_SINGLE,

	IPI_CPU_STOP,

	IPI_TIMER,

	IPI_WAKEUP,

};



/*
@@ -441,6 +442,11 @@ void arch_send_call_function_single_ipi(int cpu) 
	smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);

}



void arch_send_wakeup_ipi_mask(const struct cpumask *mask)

{

	smp_cross_call(mask, IPI_WAKEUP);

}



static const char *ipi_types[NR_IPI] = {

#define S(x,s)	[x - IPI_RESCHEDULE] = s

	S(IPI_RESCHEDULE, "Rescheduling interrupts"),
@@ -448,6 +454,7 @@ static const char *ipi_types[NR_IPI] = { 
	S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),

	S(IPI_CPU_STOP, "CPU stop interrupts"),

	S(IPI_TIMER, "Timer broadcast interrupts"),

	S(IPI_WAKEUP, "CPU wakeup interrupts"),

};



void show_ipi_list(struct seq_file *p, int prec)
@@ -540,6 +547,8 @@ void handle_IPI(int ipinr, struct pt_regs *regs) 
		irq_exit();

		break;

#endif

	case IPI_WAKEUP:

		break;



	default:

		pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);