Received-SPF: pass (google.com: domain of linux-ext4+bounces-882-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
From: Byungchul Park <byungchul@sk.com>
To: linux-kernel@vger.kernel.org
Cc: kernel_team@skhynix.com,
	torvalds@linux-foundation.org,
	damien.lemoal@opensource.wdc.com,
	linux-ide@vger.kernel.org,
	adilger.kernel@dilger.ca,
	linux-ext4@vger.kernel.org,
	mingo@redhat.com,
	peterz@infradead.org,
	will@kernel.org,
	tglx@linutronix.de,
	rostedt@goodmis.org,
	joel@joelfernandes.org,
	sashal@kernel.org,
	daniel.vetter@ffwll.ch,
	duyuyang@gmail.com,
	johannes.berg@intel.com,
	tj@kernel.org,
	tytso@mit.edu,
	willy@infradead.org,
	david@fromorbit.com,
	amir73il@gmail.com,
	gregkh@linuxfoundation.org,
	kernel-team@lge.com,
	linux-mm@kvack.org,
	akpm@linux-foundation.org,
	mhocko@kernel.org,
	minchan@kernel.org,
	hannes@cmpxchg.org,
	vdavydov.dev@gmail.com,
	sj@kernel.org,
	jglisse@redhat.com,
	dennis@kernel.org,
	cl@linux.com,
	penberg@kernel.org,
	rientjes@google.com,
	vbabka@suse.cz,
	ngupta@vflare.org,
	linux-block@vger.kernel.org,
	josef@toxicpanda.com,
	linux-fsdevel@vger.kernel.org,
	viro@zeniv.linux.org.uk,
	jack@suse.cz,
	jlayton@kernel.org,
	dan.j.williams@intel.com,
	hch@infradead.org,
	djwong@kernel.org,
	dri-devel@lists.freedesktop.org,
	rodrigosiqueiramelo@gmail.com,
	melissa.srw@gmail.com,
	hamohammed.sa@gmail.com,
	42.hyeyoo@gmail.com,
	chris.p.wilson@intel.com,
	gwan-gyeong.mun@intel.com,
	max.byungchul.park@gmail.com,
	boqun.feng@gmail.com,
	longman@redhat.com,
	hdanton@sina.com,
	her0gyugyu@gmail.com
Subject: [PATCH v11 04/26] dept: Add lock dependency tracker APIs
Date: Wed, 24 Jan 2024 20:59:15 +0900
Message-Id: <20240124115938.80132-5-byungchul@sk.com>
In-Reply-To: <20240124115938.80132-1-byungchul@sk.com>
References: <20240124115938.80132-1-byungchul@sk.com>
Precedence: bulk

Wrapped the base APIs for easier annotation on typical lock.

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 include/linux/dept_ldt.h | 77 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 include/linux/dept_ldt.h

diff --git a/include/linux/dept_ldt.h b/include/linux/dept_ldt.h
new file mode 100644
index 000000000000..062613e89fc3
--- /dev/null
+++ b/include/linux/dept_ldt.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Lock Dependency Tracker
+ *
+ * Started by Byungchul Park <max.byungchul.park@gmail.com>:
+ *
+ *  Copyright (c) 2020 LG Electronics, Inc., Byungchul Park
+ */
+
+#ifndef __LINUX_DEPT_LDT_H
+#define __LINUX_DEPT_LDT_H
+
+#include <linux/dept.h>
+
+#ifdef CONFIG_DEPT
+#define LDT_EVT_L			1UL
+#define LDT_EVT_R			2UL
+#define LDT_EVT_W			1UL
+#define LDT_EVT_RW			(LDT_EVT_R | LDT_EVT_W)
+#define LDT_EVT_ALL			(LDT_EVT_L | LDT_EVT_RW)
+
+#define ldt_init(m, k, su, n)		dept_map_init(m, k, su, n)
+#define ldt_lock(m, sl, t, n, i)					\
+	do {								\
+		if (n)							\
+			dept_ecxt_enter_nokeep(m);			\
+		else if (t)						\
+			dept_ecxt_enter(m, LDT_EVT_L, i, "trylock", "unlock", sl);\
+		else {							\
+			dept_wait(m, LDT_EVT_L, i, "lock", sl);		\
+			dept_ecxt_enter(m, LDT_EVT_L, i, "lock", "unlock", sl);\
+		}							\
+	} while (0)
+
+#define ldt_rlock(m, sl, t, n, i, q)					\
+	do {								\
+		if (n)							\
+			dept_ecxt_enter_nokeep(m);			\
+		else if (t)						\
+			dept_ecxt_enter(m, LDT_EVT_R, i, "read_trylock", "read_unlock", sl);\
+		else {							\
+			dept_wait(m, q ? LDT_EVT_RW : LDT_EVT_W, i, "read_lock", sl);\
+			dept_ecxt_enter(m, LDT_EVT_R, i, "read_lock", "read_unlock", sl);\
+		}							\
+	} while (0)
+
+#define ldt_wlock(m, sl, t, n, i)					\
+	do {								\
+		if (n)							\
+			dept_ecxt_enter_nokeep(m);			\
+		else if (t)						\
+			dept_ecxt_enter(m, LDT_EVT_W, i, "write_trylock", "write_unlock", sl);\
+		else {							\
+			dept_wait(m, LDT_EVT_RW, i, "write_lock", sl);	\
+			dept_ecxt_enter(m, LDT_EVT_W, i, "write_lock", "write_unlock", sl);\
+		}							\
+	} while (0)
+
+#define ldt_unlock(m, i)		dept_ecxt_exit(m, LDT_EVT_ALL, i)
+
+#define ldt_downgrade(m, i)						\
+	do {								\
+		if (dept_ecxt_holding(m, LDT_EVT_W))			\
+			dept_map_ecxt_modify(m, LDT_EVT_W, NULL, LDT_EVT_R, i, "downgrade", "read_unlock", -1);\
+	} while (0)
+
+#define ldt_set_class(m, n, k, sl, i)	dept_map_ecxt_modify(m, LDT_EVT_ALL, k, 0UL, i, "lock_set_class", "(any)unlock", sl)
+#else /* !CONFIG_DEPT */
+#define ldt_init(m, k, su, n)		do { (void)(k); } while (0)
+#define ldt_lock(m, sl, t, n, i)	do { } while (0)
+#define ldt_rlock(m, sl, t, n, i, q)	do { } while (0)
+#define ldt_wlock(m, sl, t, n, i)	do { } while (0)
+#define ldt_unlock(m, i)		do { } while (0)
+#define ldt_downgrade(m, i)		do { } while (0)
+#define ldt_set_class(m, n, k, sl, i)	do { } while (0)
+#endif
+#endif /* __LINUX_DEPT_LDT_H */
-- 
2.17.1