[PATCH v8 03/10] arm64: smp: Assign and setup an IPI as NMI

[Douglas Anderson]

From: Sumit Garg <sumit.garg@xxxxxxxxxx>

Assign an unused IPI which can be turned as NMI using ipi_nmi framework.
Also, invoke corresponding dynamic IPI setup/teardown APIs.

Signed-off-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
Reviewed-by: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>
Tested-by: Chen-Yu Tsai <wens@xxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---

Changes in v8:
- dynamic_ipi_setup() and dynamic_ipi_teardown() no longer take cpu param

 arch/arm64/kernel/smp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 4e8327264255..94ff063527c6 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -43,6 +43,7 @@
 #include <asm/daifflags.h>
 #include <asm/kvm_mmu.h>
 #include <asm/mmu_context.h>
+#include <asm/nmi.h>
 #include <asm/numa.h>
 #include <asm/processor.h>
 #include <asm/smp_plat.h>
@@ -938,6 +939,8 @@ static void ipi_setup(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		enable_percpu_irq(ipi_irq_base + i, 0);
+
+	dynamic_ipi_setup();
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -950,6 +953,8 @@ static void ipi_teardown(int cpu)
 
 	for (i = 0; i < nr_ipi; i++)
 		disable_percpu_irq(ipi_irq_base + i);
+
+	dynamic_ipi_teardown();
 }
 #endif
 
@@ -971,6 +976,9 @@ void __init set_smp_ipi_range(int ipi_base, int n)
 		irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
 	}
 
+	if (n > nr_ipi)
+		set_smp_dynamic_ipi(ipi_base + nr_ipi);
+
 	ipi_irq_base = ipi_base;
 
 	/* Setup the boot CPU immediately */
-- 
2.40.0.634.g4ca3ef3211-goog