[PATCH v9 18/22] riscv: mm: Add page fault trace points

[Nam Cao]

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

Signed-off-by: Nam Cao <namcao at linutronix.de>
Acked-by: Alexandre Ghiti <alexghiti at rivosinc.com>
---
Cc: Paul Walmsley <paul.walmsley at sifive.com>
Cc: Palmer Dabbelt <palmer at dabbelt.com>
Cc: Albert Ou <aou at eecs.berkeley.edu>
Cc: linux-riscv at lists.infradead.org
---
 arch/riscv/mm/fault.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 0194324a0c50..03b048108896 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)
@@ -288,6 +291,11 @@ void handle_page_fault(struct pt_regs *regs)
 	tsk = current;
 	mm = tsk->mm;
 
+	if (user_mode(regs))
+		trace_page_fault_user(addr, regs, cause);
+	else
+		trace_page_fault_kernel(addr, regs, cause);
+
 	if (kprobe_page_fault(regs, cause))
 		return;
 
-- 
2.39.5