powerpc/powernv: Enable POWER8 doorbell IPIs

This patch enables POWER8 doorbell IPIs on powernv.

Since doorbells can only IPI within a core, we test to see when we can use
doorbells and if not we fall back to XICS.  This also enables hypervisor
doorbells to wakeup us up from nap/sleep via the LPCR PECEDH bit.

Based on tests by Anton, the best case IPI latency between two threads dropped
from 894ns to 512ns.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/powerpc/sysdev/xics/icp-native.c b/arch/powerpc/sysdev/xics/icp-native.c
index 9dee47071af8..de8d9483bbe8 100644
--- a/arch/powerpc/sysdev/xics/icp-native.c
+++ b/arch/powerpc/sysdev/xics/icp-native.c
@@ -26,6 +26,7 @@
 #include <asm/errno.h>
 #include <asm/xics.h>
 #include <asm/kvm_ppc.h>
+#include <asm/dbell.h>
 
 struct icp_ipl {
         union {
@@ -145,7 +146,13 @@ static unsigned int icp_native_get_irq(void)
 static void icp_native_cause_ipi(int cpu, unsigned long data)
 {
         kvmppc_set_host_ipi(cpu, 1);
-        icp_native_set_qirr(cpu, IPI_PRIORITY);
+#ifdef CONFIG_PPC_DOORBELL
+        if (cpu_has_feature(CPU_FTR_DBELL) &&
+            (cpumask_test_cpu(cpu, cpu_sibling_mask(smp_processor_id()))))
+                doorbell_cause_ipi(cpu, data);
+        else
+#endif
+                icp_native_set_qirr(cpu, IPI_PRIORITY);
 }
 
 void xics_wake_cpu(int cpu)