linux-ext4 - [PATCH RFC v6 08/21] dept: Apply Dept to rwsem

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Message-Id: <1651652269-15342-9-git-send-email-byungchul.park@lge.com>
Date:   Wed,  4 May 2022 17:17:36 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     torvalds@...ux-foundation.org
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        adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
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Subject: [PATCH RFC v6 08/21] dept: Apply Dept to rwsem

Makes Dept able to track dependencies by rwsem.

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 include/linux/lockdep.h      | 24 ++++++++++++++++++++----
 include/linux/percpu-rwsem.h |  4 +++-
 include/linux/rwsem.h        | 22 ++++++++++++++++++++++
 3 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b59d8f3..b0e097f 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -634,10 +634,26 @@ static inline void print_irqtrace_events(struct task_struct *curr)
 	dept_mutex_unlock(&(l)->dmap, i);				\
 } while (0)
 
-#define rwsem_acquire(l, s, t, i)		lock_acquire_exclusive(l, s, t, NULL, i)
-#define rwsem_acquire_nest(l, s, t, n, i)	lock_acquire_exclusive(l, s, t, n, i)
-#define rwsem_acquire_read(l, s, t, i)		lock_acquire_shared(l, s, t, NULL, i)
-#define rwsem_release(l, i)			lock_release(l, i)
+#define rwsem_acquire(l, s, t, i)					\
+do {									\
+	lock_acquire_exclusive(l, s, t, NULL, i);			\
+	dept_rwsem_lock(&(l)->dmap, s, t, NULL, "up_write", i);		\
+} while (0)
+#define rwsem_acquire_nest(l, s, t, n, i)				\
+do {									\
+	lock_acquire_exclusive(l, s, t, n, i);				\
+	dept_rwsem_lock(&(l)->dmap, s, t, (n) ? &(n)->dmap : NULL, "up_write", i);\
+} while (0)
+#define rwsem_acquire_read(l, s, t, i)					\
+do {									\
+	lock_acquire_shared(l, s, t, NULL, i);				\
+	dept_rwsem_lock(&(l)->dmap, s, t, NULL, "up_read", i);		\
+} while (0)
+#define rwsem_release(l, i)						\
+do {									\
+	lock_release(l, i);						\
+	dept_rwsem_unlock(&(l)->dmap, i);				\
+} while (0)
 
 #define lock_map_acquire(l)			lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
 #define lock_map_acquire_read(l)		lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h
index 5fda40f..9a0603d 100644
--- a/include/linux/percpu-rwsem.h
+++ b/include/linux/percpu-rwsem.h
@@ -21,7 +21,9 @@ struct percpu_rw_semaphore {
 };
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
-#define __PERCPU_RWSEM_DEP_MAP_INIT(lockname)	.dep_map = { .name = #lockname },
+#define __PERCPU_RWSEM_DEP_MAP_INIT(lockname)	.dep_map = {	\
+	.name = #lockname,					\
+	.dmap = DEPT_MAP_INITIALIZER(lockname) },
 #else
 #define __PERCPU_RWSEM_DEP_MAP_INIT(lockname)
 #endif
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index efa5c32..ed4c34e 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -21,6 +21,7 @@
 	.dep_map = {					\
 		.name = #lockname,			\
 		.wait_type_inner = LD_WAIT_SLEEP,	\
+		.dmap = DEPT_MAP_INITIALIZER(lockname)	\
 	},
 #else
 # define __RWSEM_DEP_MAP_INIT(lockname)
@@ -32,6 +33,27 @@
 #include <linux/osq_lock.h>
 #endif
 
+#ifdef CONFIG_DEPT
+#define dept_rwsem_lock(m, ne, t, n, e_fn, ip)				\
+do {									\
+	if (t) {							\
+		dept_ecxt_enter(m, 1UL, ip, __func__, e_fn, ne);	\
+	} else if (n) {							\
+		dept_ecxt_enter_nokeep(m);				\
+	} else {							\
+		dept_wait(m, 1UL, ip, __func__, ne);			\
+		dept_ecxt_enter(m, 1UL, ip, __func__, e_fn, ne);	\
+	}								\
+} while (0)
+#define dept_rwsem_unlock(m, ip)					\
+do {									\
+	dept_ecxt_exit(m, 1UL, ip);					\
+} while (0)
+#else
+#define dept_rwsem_lock(m, ne, t, n, e_fn, ip)	do { } while (0)
+#define dept_rwsem_unlock(m, ip)		do { } while (0)
+#endif
+
 /*
  * For an uncontended rwsem, count and owner are the only fields a task
  * needs to touch when acquiring the rwsem. So they are put next to each
-- 
1.9.1