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powerpc/mpic: Add ability to reset a core via MPIC

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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: Matthew McClintock <msm@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Matthew McClintock 2010-06-29 09:42:26 +00:00 committed by Benjamin Herrenschmidt
parent d10ac3734d
commit 66953ebef6
2 changed files with 19 additions and 0 deletions
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18
arch/powerpc/sysdev/mpic.c
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@ -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

1
arch/powerpc/sysdev/mpic.h
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@ -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 */