linux-kernel - [RFC 04/14] dept: Apply Dept to spinlock

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Message-Id: <1643078204-12663-5-git-send-email-byungchul.park@lge.com>
Date:   Tue, 25 Jan 2022 11:36:34 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     torvalds@...ux-foundation.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, will@...nel.org, tglx@...utronix.de,
        rostedt@...dmis.org, joel@...lfernandes.org, sashal@...nel.org,
        daniel.vetter@...ll.ch, chris@...is-wilson.co.uk,
        duyuyang@...il.com, johannes.berg@...el.com, tj@...nel.org,
        tytso@....edu, willy@...radead.org, david@...morbit.com,
        amir73il@...il.com, bfields@...ldses.org,
        gregkh@...uxfoundation.org, kernel-team@....com
Subject: [RFC 04/14] dept: Apply Dept to spinlock

Makes Dept able to track dependencies by spinlock.

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 include/linux/lockdep.h        | 18 +++++++++++++++---
 include/linux/spinlock.h       | 24 ++++++++++++++++++++++++
 include/linux/spinlock_types.h | 10 ++++++++++
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index bcd9d7d..c08e3ae 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -566,9 +566,21 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 #define lock_acquire_shared(l, s, t, n, i)		lock_acquire(l, s, t, 1, 1, n, i)
 #define lock_acquire_shared_recursive(l, s, t, n, i)	lock_acquire(l, s, t, 2, 1, n, i)
 
-#define spin_acquire(l, s, t, i)		lock_acquire_exclusive(l, s, t, NULL, i)
-#define spin_acquire_nest(l, s, t, n, i)	lock_acquire_exclusive(l, s, t, n, i)
-#define spin_release(l, i)			lock_release(l, i)
+#define spin_acquire(l, s, t, i)					\
+do {									\
+	lock_acquire_exclusive(l, s, t, NULL, i);			\
+	dept_spin_lock(&(l)->dmap, s, t, NULL, "spin_unlock", i);	\
+} while (0)
+#define spin_acquire_nest(l, s, t, n, i)				\
+do {									\
+	lock_acquire_exclusive(l, s, t, n, i);				\
+	dept_spin_lock(&(l)->dmap, s, t, (n) ? &(n)->dmap : NULL, "spin_unlock", i); \
+} while (0)
+#define spin_release(l, i)						\
+do {									\
+	lock_release(l, i);						\
+	dept_spin_unlock(&(l)->dmap, i);				\
+} while (0)
 
 #define rwlock_acquire(l, s, t, i)		lock_acquire_exclusive(l, s, t, NULL, i)
 #define rwlock_acquire_read(l, s, t, i)					\
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 7989784..b25bfc1 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -92,6 +92,30 @@
 # include <linux/spinlock_up.h>
 #endif
 
+#ifdef CONFIG_DEPT
+#define dept_spin_lock(m, ne, t, n, e_fn, ip)				\
+do {									\
+	if (t) {							\
+		dept_ecxt_enter(m, 1UL, ip, __func__, e_fn, ne);	\
+		dept_asked_event(m);					\
+	} else if (n) {							\
+		dept_warn_on(dept_top_map() != (n));			\
+	} else {							\
+		dept_wait(m, 1UL, ip, __func__, ne);			\
+		dept_ecxt_enter(m, 1UL, ip, __func__, e_fn, ne);	\
+		dept_asked_event(m);					\
+	}								\
+} while (0)
+#define dept_spin_unlock(m, ip)						\
+do {									\
+	dept_event(m, 1UL, ip, __func__);				\
+	dept_ecxt_exit(m, ip);						\
+} while (0)
+#else
+#define dept_spin_lock(m, ne, t, n, e_fn, ip)	do { } while (0)
+#define dept_spin_unlock(m, ip)			do { } while (0)
+#endif
+
 #ifdef CONFIG_DEBUG_SPINLOCK
   extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
 				   struct lock_class_key *key, short inner);
diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index b981caa..4ed8a9b 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -32,16 +32,26 @@
 
 #define SPINLOCK_OWNER_INIT	((void *)-1L)
 
+#ifdef CONFIG_DEPT
+# define RAW_SPIN_DMAP_INIT(lockname)	.dmap = { .name = #lockname },
+# define SPIN_DMAP_INIT(lockname)	.dmap = { .name = #lockname },
+#else
+# define RAW_SPIN_DMAP_INIT(lockname)
+# define SPIN_DMAP_INIT(lockname)
+#endif
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # define RAW_SPIN_DEP_MAP_INIT(lockname)		\
 	.dep_map = {					\
 		.name = #lockname,			\
 		.wait_type_inner = LD_WAIT_SPIN,	\
+		RAW_SPIN_DMAP_INIT(lockname)		\
 	}
 # define SPIN_DEP_MAP_INIT(lockname)			\
 	.dep_map = {					\
 		.name = #lockname,			\
 		.wait_type_inner = LD_WAIT_CONFIG,	\
+		SPIN_DMAP_INIT(lockname)		\
 	}
 #else
 # define RAW_SPIN_DEP_MAP_INIT(lockname)
-- 
1.9.1