1 files changed, 150 insertions, 0 deletions
diff --git a/tools/perf/util/lock-contention.h b/tools/perf/util/lock-contention.h
new file mode 100644
index 000000000000..b8cb8830b7bc
--- /dev/null
+++ b/tools/perf/util/lock-contention.h
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PERF_LOCK_CONTENTION_H
+#define PERF_LOCK_CONTENTION_H
+
+#include <linux/list.h>
+#include <linux/rbtree.h>
+
+struct lock_stat {
+	struct hlist_node	hash_entry;
+	struct rb_node		rb;		/* used for sorting */
+
+	u64			addr;		/* address of lockdep_map, used as ID */
+	char			*name;		/* for strcpy(), we cannot use const */
+	u64			*callstack;
+
+	unsigned int		nr_acquire;
+	unsigned int		nr_acquired;
+	unsigned int		nr_contended;
+	unsigned int		nr_release;
+
+	union {
+		unsigned int	nr_readlock;
+		unsigned int	flags;
+	};
+	unsigned int		nr_trylock;
+
+	/* these times are in nano sec. */
+	u64                     avg_wait_time;
+	u64			wait_time_total;
+	u64			wait_time_min;
+	u64			wait_time_max;
+
+	int			broken; /* flag of blacklist */
+	int			combined;
+};
+
+/*
+ * States of lock_seq_stat
+ *
+ * UNINITIALIZED is required for detecting first event of acquire.
+ * As the nature of lock events, there is no guarantee
+ * that the first event for the locks are acquire,
+ * it can be acquired, contended or release.
+ */
+#define SEQ_STATE_UNINITIALIZED      0	       /* initial state */
+#define SEQ_STATE_RELEASED	1
+#define SEQ_STATE_ACQUIRING	2
+#define SEQ_STATE_ACQUIRED	3
+#define SEQ_STATE_READ_ACQUIRED	4
+#define SEQ_STATE_CONTENDED	5
+
+/*
+ * MAX_LOCK_DEPTH
+ * Imported from include/linux/sched.h.
+ * Should this be synchronized?
+ */
+#define MAX_LOCK_DEPTH 48
+
+/*
+ * struct lock_seq_stat:
+ * Place to put on state of one lock sequence
+ * 1) acquire -> acquired -> release
+ * 2) acquire -> contended -> acquired -> release
+ * 3) acquire (with read or try) -> release
+ * 4) Are there other patterns?
+ */
+struct lock_seq_stat {
+	struct list_head        list;
+	int			state;
+	u64			prev_event_time;
+	u64                     addr;
+
+	int                     read_count;
+};
+
+struct thread_stat {
+	struct rb_node		rb;
+
+	u32                     tid;
+	struct list_head        seq_list;
+};
+
+/*
+ * CONTENTION_STACK_DEPTH
+ * Number of stack trace entries to find callers
+ */
+#define CONTENTION_STACK_DEPTH  8
+
+/*
+ * CONTENTION_STACK_SKIP
+ * Number of stack trace entries to skip when finding callers.
+ * The first few entries belong to the locking implementation itself.
+ */
+#define CONTENTION_STACK_SKIP  3
+
+/*
+ * flags for lock:contention_begin
+ * Imported from include/trace/events/lock.h.
+ */
+#define LCB_F_SPIN	(1U << 0)
+#define LCB_F_READ	(1U << 1)
+#define LCB_F_WRITE	(1U << 2)
+#define LCB_F_RT	(1U << 3)
+#define LCB_F_PERCPU	(1U << 4)
+#define LCB_F_MUTEX	(1U << 5)
+
+struct evlist;
+struct machine;
+struct target;
+
+struct lock_contention {
+	struct evlist *evlist;
+	struct target *target;
+	struct machine *machine;
+	struct hlist_head *result;
+	unsigned long map_nr_entries;
+	int lost;
+	int max_stack;
+	int stack_skip;
+};
+
+#ifdef HAVE_BPF_SKEL
+
+int lock_contention_prepare(struct lock_contention *con);
+int lock_contention_start(void);
+int lock_contention_stop(void);
+int lock_contention_read(struct lock_contention *con);
+int lock_contention_finish(void);
+
+#else  /* !HAVE_BPF_SKEL */
+
+static inline int lock_contention_prepare(struct lock_contention *con __maybe_unused)
+{
+	return 0;
+}
+
+static inline int lock_contention_start(void) { return 0; }
+static inline int lock_contention_stop(void) { return 0; }
+static inline int lock_contention_finish(void) { return 0; }
+
+static inline int lock_contention_read(struct lock_contention *con __maybe_unused)
+{
+	return 0;
+}
+
+#endif  /* HAVE_BPF_SKEL */
+
+bool is_lock_function(struct machine *machine, u64 addr);
+
+#endif  /* PERF_LOCK_CONTENTION_H */