On 2020-10-14 12:12, Sumit Garg wrote:
Allocate an unused IPI that can be turned as NMI using ipi_nmi
framework.
This doesn't do any allocation, as far as I can see. It relies on
the initial grant from the interrupt controller to be larger than
what the kernel currently uses.
Also, invoke corresponding NMI setup/teardown APIs.
Signed-off-by: Sumit Garg <sumit.g...@linaro.org>
---
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 82e75fc..129ebfb 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>
@@ -962,6 +963,8 @@ static void ipi_setup(int cpu)
for (i = 0; i < nr_ipi; i++)
enable_percpu_irq(ipi_irq_base + i, 0);
+
+ ipi_nmi_setup(cpu);
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -974,6 +977,8 @@ static void ipi_teardown(int cpu)
for (i = 0; i < nr_ipi; i++)
disable_percpu_irq(ipi_irq_base + i);
+
+ ipi_nmi_teardown(cpu);
}
#endif
@@ -995,6 +1000,9 @@ 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_ipi_nmi(ipi_base + nr_ipi);
+
ipi_irq_base = ipi_base;
/* Setup the boot CPU immediately */
Thanks,
M.
--
Jazz is not dead. It just smells funny...
