1 files changed, 40 insertions, 0 deletions
diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_callchain.c
new file mode 100644
index 000000000000..9b7f26b128b5
--- /dev/null
+++ b/arch/arm64/kernel/perf_callchain.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arm64 callchain support
+ *
+ * Copyright (C) 2015 ARM Limited
+ */
+#include <linux/perf_event.h>
+#include <linux/stacktrace.h>
+#include <linux/uaccess.h>
+
+#include <asm/pointer_auth.h>
+
+static bool callchain_trace(void *data, unsigned long pc)
+{
+	struct perf_callchain_entry_ctx *entry = data;
+
+	return perf_callchain_store(entry, pc) == 0;
+}
+
+void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
+			 struct pt_regs *regs)
+{
+	if (perf_guest_state()) {
+		/* We don't support guest os callchain now */
+		return;
+	}
+
+	arch_stack_walk_user(callchain_trace, entry, regs);
+}
+
+void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
+			   struct pt_regs *regs)
+{
+	if (perf_guest_state()) {
+		/* We don't support guest os callchain now */
+		return;
+	}
+
+	arch_stack_walk(callchain_trace, entry, current, regs);
+}