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 0194324a0c5060dd6e205166c34c79480e0f7960..04ed6f8acae4fd0ecb175ef7520da381a8cbecf6 100644 (file)
--- 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.