linux-kernel - [PATCH 3/3] arm64: Kconfig: Add support for the Perf NMI

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Date:   Sat, 16 May 2020 20:48:57 +0800
From:   Lecopzer Chen <lecopzer@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     lecopzer.chen@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        matthias.bgg@...il.com, catalin.marinas@....com, will@...nel.org,
        mark.rutland@....com, mingo@...hat.com, acme@...nel.org,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-mediatek@...ts.infradead.org,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        yj.chiang@...iatek.com, Lecopzer Chen <lecopzer@...il.com>
Subject: [PATCH 3/3] arm64: Kconfig: Add support for the Perf NMI

This is an extending function for Pseudo NMI that registering
Perf events interrupts as NMI.

It's helpful for sampling irq-off context when using perf.

Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
---
 arch/arm64/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 40fb05d96c60..f89c169771a0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1679,6 +1679,16 @@ config ARM64_PSEUDO_NMI
 	  If unsure, say N
 
 if ARM64_PSEUDO_NMI
+config ARM64_PSEUDO_NMI_PERF
+	bool "Register Perf interrupts as Pseudo NMI"
+	depends on HW_PERF_EVENTS
+	depends on ARM_PMU
+	select HAVE_PERF_EVENTS_NMI
+	help
+	  This registers Perf interrupts to NMI when Pseudo NMI is active.
+	  This option is helpful when you need to debug any context disabled
+	  irq and get more inforamtion.
+
+	  If unsure, say N
+
 config ARM64_DEBUG_PRIORITY_MASKING
 	bool "Debug interrupt priority masking"
 	help
-- 
2.25.1