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authorMatthew McClintock <msm@freescale.com>2010-06-29 09:42:26 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-09 11:28:27 +1000
commit66953ebef60ffe94650a735b445f1495d989c523 (patch)
tree705ea34685f8c378381f8f5926d7bbf757ac3333
parentd10ac3734d07bee675384d22d06883b3c57b1524 (diff)
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>
-rw-r--r--arch/powerpc/sysdev/mpic.c18
-rw-r--r--arch/powerpc/sysdev/mpic.h1
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 20b73c025a45..7c1342618a30 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -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
diff --git a/arch/powerpc/sysdev/mpic.h b/arch/powerpc/sysdev/mpic.h
index eff433c322a0..e4a6df77b8d7 100644
--- a/arch/powerpc/sysdev/mpic.h
+++ b/arch/powerpc/sysdev/mpic.h
@@ -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 */