From: Vineet Gupta <vgupta@synopsys.com>
Date: Tue, 12 Nov 2013 10:00:03 +0000 (+0100)
Subject: ARC: perf: Add kernel callchain support
X-Git-Tag: firefly_0821_release~176^2~1874^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=389e3160b9b0002f8e7c95e9c0af5da6da311892;p=firefly-linux-kernel-4.4.55.git

ARC: perf: Add kernel callchain support

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---

diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 181baeed4495..a6ad1e09e4be 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -16,6 +16,7 @@
 #include <linux/perf_event.h>
 #include <linux/platform_device.h>
 #include <asm/arcregs.h>
+#include <asm/stacktrace.h>
 
 struct arc_pmu {
 	struct pmu	pmu;
@@ -25,6 +26,34 @@ struct arc_pmu {
 	int		ev_hw_idx[PERF_COUNT_ARC_HW_MAX];
 };
 
+struct arc_callchain_trace {
+	int depth;
+	void *perf_stuff;
+};
+
+static int callchain_trace(unsigned int addr, void *data)
+{
+	struct arc_callchain_trace *ctrl = data;
+	struct perf_callchain_entry *entry = ctrl->perf_stuff;
+	perf_callchain_store(entry, addr);
+
+	if (ctrl->depth++ < 3)
+		return 0;
+
+	return -1;
+}
+
+void
+perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
+{
+	struct arc_callchain_trace ctrl = {
+		.depth = 0,
+		.perf_stuff = entry,
+	};
+
+	arc_unwind_core(NULL, regs, callchain_trace, &ctrl);
+}
+
 static struct arc_pmu *arc_pmu;
 
 /* read counter #idx; note that counter# != event# on ARC! */