[PATCH v10 15/19] 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 <nam...@linutronix.de>
Acked-by: Alexandre Ghiti <alexgh...@rivosinc.com>
---
Cc: Paul Walmsley <paul.walms...@sifive.com>
Cc: Palmer Dabbelt <pal...@dabbelt.com>
Cc: Albert Ou <a...@eecs.berkeley.edu>
Cc: linux-ri...@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 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.
-- 
2.39.5