[PATCH v9 17/22] arm64: mm: Add page fault trace points

[Nam Cao]

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

Signed-off-by: Nam Cao <nam...@linutronix.de>
---
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Will Deacon <w...@kernel.org>
Cc: linux-arm-ker...@lists.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 ec0a337891dd..d917556869f9 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);
@@ -556,6 +559,11 @@ static int __kprobes do_page_fault(unsigned long far, 
unsigned long esr,
        int si_code;
        int pkey = -1;
 
+       if (user_mode(regs))
+               trace_page_fault_user(addr, regs, esr);
+       else
+               trace_page_fault_kernel(addr, regs, esr);
+
        if (kprobe_page_fault(regs, esr))
                return 0;
 
-- 
2.39.5