linux-kernel - [PATCH bpf-next v4 18/25] rqspinlock: Add locktorture support

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Message-ID: <20250316040541.108729-19-memxor@gmail.com>
Date: Sat, 15 Mar 2025 21:05:34 -0700
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Will Deacon <will@...nel.org>,
	Waiman Long <llong@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Tejun Heo <tj@...nel.org>,
	Barret Rhoden <brho@...gle.com>,
	Josh Don <joshdon@...gle.com>,
	Dohyun Kim <dohyunkim@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	kkd@...a.com,
	kernel-team@...a.com
Subject: [PATCH bpf-next v4 18/25] rqspinlock: Add locktorture support

Introduce locktorture support for rqspinlock using the newly added
macros as the first in-kernel user and consumer. Guard the code with
CONFIG_BPF_SYSCALL ifdef since rqspinlock is not available otherwise.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
 kernel/locking/locktorture.c | 57 ++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index cc33470f4de9..ce0362f0a871 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -362,6 +362,60 @@ static struct lock_torture_ops raw_spin_lock_irq_ops = {
 	.name		= "raw_spin_lock_irq"
 };
 
+#ifdef CONFIG_BPF_SYSCALL
+
+#include <asm/rqspinlock.h>
+static rqspinlock_t rqspinlock;
+
+static int torture_raw_res_spin_write_lock(int tid __maybe_unused)
+{
+	raw_res_spin_lock(&rqspinlock);
+	return 0;
+}
+
+static void torture_raw_res_spin_write_unlock(int tid __maybe_unused)
+{
+	raw_res_spin_unlock(&rqspinlock);
+}
+
+static struct lock_torture_ops raw_res_spin_lock_ops = {
+	.writelock	= torture_raw_res_spin_write_lock,
+	.write_delay	= torture_spin_lock_write_delay,
+	.task_boost     = torture_rt_boost,
+	.writeunlock	= torture_raw_res_spin_write_unlock,
+	.readlock       = NULL,
+	.read_delay     = NULL,
+	.readunlock     = NULL,
+	.name		= "raw_res_spin_lock"
+};
+
+static int torture_raw_res_spin_write_lock_irq(int tid __maybe_unused)
+{
+	unsigned long flags;
+
+	raw_res_spin_lock_irqsave(&rqspinlock, flags);
+	cxt.cur_ops->flags = flags;
+	return 0;
+}
+
+static void torture_raw_res_spin_write_unlock_irq(int tid __maybe_unused)
+{
+	raw_res_spin_unlock_irqrestore(&rqspinlock, cxt.cur_ops->flags);
+}
+
+static struct lock_torture_ops raw_res_spin_lock_irq_ops = {
+	.writelock	= torture_raw_res_spin_write_lock_irq,
+	.write_delay	= torture_spin_lock_write_delay,
+	.task_boost     = torture_rt_boost,
+	.writeunlock	= torture_raw_res_spin_write_unlock_irq,
+	.readlock       = NULL,
+	.read_delay     = NULL,
+	.readunlock     = NULL,
+	.name		= "raw_res_spin_lock_irq"
+};
+
+#endif
+
 static DEFINE_RWLOCK(torture_rwlock);
 
 static int torture_rwlock_write_lock(int tid __maybe_unused)
@@ -1168,6 +1222,9 @@ static int __init lock_torture_init(void)
 		&lock_busted_ops,
 		&spin_lock_ops, &spin_lock_irq_ops,
 		&raw_spin_lock_ops, &raw_spin_lock_irq_ops,
+#ifdef CONFIG_BPF_SYSCALL
+		&raw_res_spin_lock_ops, &raw_res_spin_lock_irq_ops,
+#endif
 		&rw_lock_ops, &rw_lock_irq_ops,
 		&mutex_lock_ops,
 		&ww_mutex_lock_ops,
-- 
2.47.1