linux-kernel - [PATCH 07/10] arm64: mm: Add page fault trace points

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Message-Id: <b0e391920b441487d52652edef822883923e3b39.1741708239.git.namcao@linutronix.de>
Date: Tue, 11 Mar 2025 18:05:08 +0100
From: Nam Cao <namcao@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>,
	Gabriele Monaco <gmonaco@...hat.com>,
	john.ogness@...utronix.de,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Nam Cao <namcao@...utronix.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 07/10] arm64: mm: Add page fault trace points

Add page fault trace points, which are useful to implement RV monitor which
watches page faults.

Signed-off-by: Nam Cao <namcao@...utronix.de>
---
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
---
 arch/arm64/mm/fault.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index ef63651099a9..e3f096b0dffd 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -44,6 +44,9 @@
 #include <asm/tlbflush.h>
 #include <asm/traps.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/exceptions.h>
+
 struct fault_info {
 	int	(*fn)(unsigned long far, unsigned long esr,
 		      struct pt_regs *regs);
@@ -559,6 +562,11 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr,
 	if (kprobe_page_fault(regs, esr))
 		return 0;
 
+	if (user_mode(regs))
+		trace_page_fault_user(addr, regs, esr);
+	else
+		trace_page_fault_kernel(addr, regs, esr);
+
 	/*
 	 * If we're in an interrupt or have no user context, we must not take
 	 * the fault.
-- 
2.39.5