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Commit 66953ebe authored by Matthew McClintock's avatar Matthew McClintock Committed by Benjamin Herrenschmidt
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powerpc/mpic: Add ability to reset a core via MPIC 



We need the ability to reset cores for use with kexec/kdump for
SMP systems. Calling this function with the specific core you want
to reset will cause the CPU to spin in reset.

Signed-off-by: default avatarMatthew McClintock <msm@freescale.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent d10ac373

arch/powerpc/sysdev/mpic.c

+18 −0
Original line number Diff line number Diff line
@@ -1636,6 +1636,24 @@ void __devinit smp_mpic_setup_cpu(int cpu) 
{

	mpic_setup_this_cpu();

}



void mpic_reset_core(int cpu)

{

	struct mpic *mpic = mpic_primary;

	u32 pir;

	int cpuid = get_hard_smp_processor_id(cpu);



	/* Set target bit for core reset */

	pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));

	pir |= (1 << cpuid);

	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);

	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));



	/* Restore target bit after reset complete */

	pir &= ~(1 << cpuid);

	mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);

	mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));

}

#endif /* CONFIG_SMP */



#ifdef CONFIG_PM

arch/powerpc/sysdev/mpic.h

+1 −0
Original line number Diff line number Diff line
@@ -37,5 +37,6 @@ static inline int mpic_pasemi_msi_init(struct mpic *mpic) 
extern int mpic_set_irq_type(unsigned int virq, unsigned int flow_type);

extern void mpic_set_vector(unsigned int virq, unsigned int vector);

extern int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask);

extern void mpic_reset_core(int cpu);



#endif /* _POWERPC_SYSDEV_MPIC_H */