From: Nam Cao <namcao@linutronix.de>
Date: Wed, 9 Jul 2025 19:21:19 +0000 (+0200)
Subject: riscv: mm: Add page fault trace points
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a37c71ca412d90365e143581582c4ecd3a90508f;p=thirdparty%2Fkernel%2Flinux.git

riscv: mm: Add page fault trace points

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

Signed-off-by: Nam Cao <namcao@linutronix.de>
Acked-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 0194324a0c506..04ed6f8acae4f 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -20,6 +20,9 @@
 #include <asm/ptrace.h>
 #include <asm/tlbflush.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/exceptions.h>
+
 #include "../kernel/head.h"
 
 static void show_pte(unsigned long addr)
@@ -291,6 +294,11 @@ void handle_page_fault(struct pt_regs *regs)
 	if (kprobe_page_fault(regs, cause))
 		return;
 
+	if (user_mode(regs))
+		trace_page_fault_user(addr, regs, cause);
+	else
+		trace_page_fault_kernel(addr, regs, cause);
+
 	/*
 	 * Fault-in kernel-space virtual memory on-demand.
 	 * The 'reference' page table is init_mm.pgd.