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From:   Byungchul Park <byungchul.park@lge.com>
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Subject: [PATCH v4 07/24] dept: Apply Dept to rwlock
Date:   Fri,  4 Mar 2022 16:06:26 +0900
Message-Id: <1646377603-19730-8-git-send-email-byungchul.park@lge.com>
In-Reply-To: <1646377603-19730-1-git-send-email-byungchul.park@lge.com>
References: <1646377603-19730-1-git-send-email-byungchul.park@lge.com>
Precedence: bulk

Makes Dept able to track dependencies by rwlock.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
---
 include/linux/lockdep.h        | 25 ++++++++++++++++----
 include/linux/rwlock.h         | 52 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/rwlock_api_smp.h |  8 +++----
 include/linux/rwlock_types.h   |  7 ++++++
 4 files changed, 83 insertions(+), 9 deletions(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 6653a4f..b93a707 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -600,16 +600,31 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 	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(l, s, t, i)					\
+do {									\
+	lock_acquire_exclusive(l, s, t, NULL, i);			\
+	dept_rwlock_wlock(&(l)->dmap, s, t, NULL, "write_unlock", i);	\
+} while (0)
 #define rwlock_acquire_read(l, s, t, i)					\
 do {									\
-	if (read_lock_is_recursive())					\
+	if (read_lock_is_recursive()) {				\
 		lock_acquire_shared_recursive(l, s, t, NULL, i);	\
-	else								\
+		dept_rwlock_rlock(&(l)->dmap, s, t, NULL, "read_unlock", i, 0);\
+	} else {							\
 		lock_acquire_shared(l, s, t, NULL, i);			\
+		dept_rwlock_rlock(&(l)->dmap, s, t, NULL, "read_unlock", i, 1);\
+	}								\
+} while (0)
+#define rwlock_release(l, i)						\
+do {									\
+	lock_release(l, i);						\
+	dept_rwlock_wunlock(&(l)->dmap, i);				\
+} while (0)
+#define rwlock_release_read(l, i)					\
+do {									\
+	lock_release(l, i);						\
+	dept_rwlock_runlock(&(l)->dmap, i);				\
 } while (0)
-
-#define rwlock_release(l, i)			lock_release(l, i)
 
 #define seqcount_acquire(l, s, t, i)		lock_acquire_exclusive(l, s, t, NULL, i)
 #define seqcount_acquire_read(l, s, t, i)	lock_acquire_shared_recursive(l, s, t, NULL, i)
diff --git a/include/linux/rwlock.h b/include/linux/rwlock.h
index 8f416c5..768ad9e 100644
--- a/include/linux/rwlock.h
+++ b/include/linux/rwlock.h
@@ -28,6 +28,58 @@
 	do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
 #endif
 
+#ifdef CONFIG_DEPT
+#define DEPT_EVT_RWLOCK_R		1UL
+#define DEPT_EVT_RWLOCK_W		(1UL << 1)
+#define DEPT_EVT_RWLOCK_RW		(DEPT_EVT_RWLOCK_R | DEPT_EVT_RWLOCK_W)
+
+#define dept_rwlock_wlock(m, ne, t, n, e_fn, ip)			\
+do {									\
+	if (t) {							\
+		dept_ecxt_enter(m, DEPT_EVT_RWLOCK_W, ip, __func__, e_fn, ne);\
+		dept_ask_event(m);					\
+	} else if (n) {							\
+		dept_skip(m);						\
+	} else {							\
+		dept_wait(m, DEPT_EVT_RWLOCK_RW, ip, __func__, ne);	\
+		dept_ecxt_enter(m, DEPT_EVT_RWLOCK_W, ip, __func__, e_fn, ne);\
+		dept_ask_event(m);					\
+	}								\
+} while (0)
+#define dept_rwlock_rlock(m, ne, t, n, e_fn, ip, q)			\
+do {									\
+	if (t) {							\
+		dept_ecxt_enter(m, DEPT_EVT_RWLOCK_R, ip, __func__, e_fn, ne);\
+		dept_ask_event(m);					\
+	} else if (n) {							\
+		dept_skip(m);						\
+	} else {							\
+		dept_wait(m, (q) ? DEPT_EVT_RWLOCK_RW : DEPT_EVT_RWLOCK_W, ip, __func__, ne);\
+		dept_ecxt_enter(m, DEPT_EVT_RWLOCK_R, ip, __func__, e_fn, ne);\
+		dept_ask_event(m);					\
+	}								\
+} while (0)
+#define dept_rwlock_wunlock(m, ip)					\
+do {									\
+	if (!dept_unskip_if_skipped(m)) {				\
+		dept_event(m, DEPT_EVT_RWLOCK_W, ip, __func__);		\
+		dept_ecxt_exit(m, ip);					\
+	}								\
+} while (0)
+#define dept_rwlock_runlock(m, ip)					\
+do {									\
+	if (!dept_unskip_if_skipped(m)) {				\
+		dept_event(m, DEPT_EVT_RWLOCK_R, ip, __func__);		\
+		dept_ecxt_exit(m, ip);					\
+	}								\
+} while (0)
+#else
+#define dept_rwlock_wlock(m, ne, t, n, e_fn, ip)	do { } while (0)
+#define dept_rwlock_rlock(m, ne, t, n, e_fn, ip, q)	do { } while (0)
+#define dept_rwlock_wunlock(m, ip)			do { } while (0)
+#define dept_rwlock_runlock(m, ip)			do { } while (0)
+#endif
+
 #ifdef CONFIG_DEBUG_SPINLOCK
  extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
  extern int do_raw_read_trylock(rwlock_t *lock);
diff --git a/include/linux/rwlock_api_smp.h b/include/linux/rwlock_api_smp.h
index dceb0a5..a222cf1 100644
--- a/include/linux/rwlock_api_smp.h
+++ b/include/linux/rwlock_api_smp.h
@@ -228,7 +228,7 @@ static inline void __raw_write_unlock(rwlock_t *lock)
 
 static inline void __raw_read_unlock(rwlock_t *lock)
 {
-	rwlock_release(&lock->dep_map, _RET_IP_);
+	rwlock_release_read(&lock->dep_map, _RET_IP_);
 	do_raw_read_unlock(lock);
 	preempt_enable();
 }
@@ -236,7 +236,7 @@ static inline void __raw_read_unlock(rwlock_t *lock)
 static inline void
 __raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 {
-	rwlock_release(&lock->dep_map, _RET_IP_);
+	rwlock_release_read(&lock->dep_map, _RET_IP_);
 	do_raw_read_unlock(lock);
 	local_irq_restore(flags);
 	preempt_enable();
@@ -244,7 +244,7 @@ static inline void __raw_read_unlock(rwlock_t *lock)
 
 static inline void __raw_read_unlock_irq(rwlock_t *lock)
 {
-	rwlock_release(&lock->dep_map, _RET_IP_);
+	rwlock_release_read(&lock->dep_map, _RET_IP_);
 	do_raw_read_unlock(lock);
 	local_irq_enable();
 	preempt_enable();
@@ -252,7 +252,7 @@ static inline void __raw_read_unlock_irq(rwlock_t *lock)
 
 static inline void __raw_read_unlock_bh(rwlock_t *lock)
 {
-	rwlock_release(&lock->dep_map, _RET_IP_);
+	rwlock_release_read(&lock->dep_map, _RET_IP_);
 	do_raw_read_unlock(lock);
 	__local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
 }
diff --git a/include/linux/rwlock_types.h b/include/linux/rwlock_types.h
index 1948442..74804b7 100644
--- a/include/linux/rwlock_types.h
+++ b/include/linux/rwlock_types.h
@@ -5,11 +5,18 @@
 # error "Do not include directly, include spinlock_types.h"
 #endif
 
+#ifdef CONFIG_DEPT
+# define RW_DMAP_INIT(lockname) .dmap = { .name = #lockname, .skip_cnt = ATOMIC_INIT(0) },
+#else
+# define RW_DMAP_INIT(lockname)
+#endif
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # define RW_DEP_MAP_INIT(lockname)					\
 	.dep_map = {							\
 		.name = #lockname,					\
 		.wait_type_inner = LD_WAIT_CONFIG,			\
+		RW_DMAP_INIT(lockname)					\
 	}
 #else
 # define RW_DEP_MAP_INIT(lockname)
-- 
1.9.1