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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: Matthew McClintock <msm@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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2 changed files with 19 additions and 0 deletions
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@ -1636,6 +1636,24 @@ void __devinit smp_mpic_setup_cpu(int cpu)
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{
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{
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mpic_setup_this_cpu();
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mpic_setup_this_cpu();
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}
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}
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void mpic_reset_core(int cpu)
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{
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struct mpic *mpic = mpic_primary;
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u32 pir;
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int cpuid = get_hard_smp_processor_id(cpu);
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/* Set target bit for core reset */
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pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
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pir |= (1 << cpuid);
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mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
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mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
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/* Restore target bit after reset complete */
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pir &= ~(1 << cpuid);
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mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
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mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
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}
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#endif /* CONFIG_SMP */
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_PM
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#ifdef CONFIG_PM
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@ -37,5 +37,6 @@ static inline int mpic_pasemi_msi_init(struct mpic *mpic)
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extern int mpic_set_irq_type(unsigned int virq, unsigned int flow_type);
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extern int mpic_set_irq_type(unsigned int virq, unsigned int flow_type);
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extern void mpic_set_vector(unsigned int virq, unsigned int vector);
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extern void mpic_set_vector(unsigned int virq, unsigned int vector);
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extern int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask);
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extern int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask);
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extern void mpic_reset_core(int cpu);
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#endif /* _POWERPC_SYSDEV_MPIC_H */
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#endif /* _POWERPC_SYSDEV_MPIC_H */
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