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[1/2] powerpc/mpic: Add ability to reset a core via MPIC

Message ID 1277840547-19007-1-git-send-email-msm@freescale.com (mailing list archive)
State Accepted, archived
Commit 66953ebef60ffe94650a735b445f1495d989c523
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Matthew McClintock June 29, 2010, 7:42 p.m. UTC 
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>
---
 arch/powerpc/sysdev/mpic.c |   18 ++++++++++++++++++
 arch/powerpc/sysdev/mpic.h |    1 +
 2 files changed, 19 insertions(+), 0 deletions(-)
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Patch

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 20b73c0..7c13426 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 eff433c..e4a6df7 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 */