Function to cause an IPI. Requires kvm_hstate.xics_phys
to be initialized with physical address of XICS.
Signed-off-by: Suresh Warrier <warrier@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/xics.h | 1 +
arch/powerpc/sysdev/xics/icp-native.c | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/arch/powerpc/include/asm/xics.h b/arch/powerpc/include/asm/xics.h
index 0e25bdb..2546048 100644
--- a/arch/powerpc/include/asm/xics.h
+++ b/arch/powerpc/include/asm/xics.h
@@ -30,6 +30,7 @@
#ifdef CONFIG_PPC_ICP_NATIVE
extern int icp_native_init(void);
extern void icp_native_flush_interrupt(void);
+extern void icp_native_cause_ipi_rm(int cpu);
#else
static inline int icp_native_init(void) { return -ENODEV; }
#endif
diff --git a/arch/powerpc/sysdev/xics/icp-native.c b/arch/powerpc/sysdev/xics/icp-native.c
index eae3265..e39b18a 100644
--- a/arch/powerpc/sysdev/xics/icp-native.c
+++ b/arch/powerpc/sysdev/xics/icp-native.c
@@ -159,6 +159,25 @@ static void icp_native_cause_ipi(int cpu, unsigned long data)
icp_native_set_qirr(cpu, IPI_PRIORITY);
}
+void icp_native_cause_ipi_rm(int cpu)
+{
+ /*
+ * Currently not used to send IPIs to another CPU
+ * on the same core. Only caller is KVM real mode.
+ * Need the physical address of the XICS to be
+ * previously saved in kvm_hstate in the paca.
+ */
+ unsigned long xics_phys;
+
+ /*
+ * Just like the cause_ipi functions, it is required to
+ * include a full barrier (out8 includes a sync) before
+ * causing the IPI.
+ */
+ xics_phys = paca[cpu].kvm_hstate.xics_phys;
+ out_rm8((u8 *)(xics_phys + XICS_MFRR), IPI_PRIORITY);
+}
+
/*
* Called when an interrupt is received on an off-line CPU to
* clear the interrupt, so that the CPU can go back to nap mode.
--
1.8.3.4
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