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From: Chris Lew <quic_clew@quicinc.com>
Date: Wed, 29 May 2024 11:09:55 -0700
Subject: [PATCH v3 1/4] hwspinlock: Introduce hwspin_lock_bust()
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Message-ID: <20240529-hwspinlock-bust-v3-1-c8b924ffa5a2@quicinc.com>
References: <20240529-hwspinlock-bust-v3-0-c8b924ffa5a2@quicinc.com>
In-Reply-To: <20240529-hwspinlock-bust-v3-0-c8b924ffa5a2@quicinc.com>
To: Bjorn Andersson <andersson@kernel.org>,
        Baolin Wang
	<baolin.wang@linux.alibaba.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Ingo
 Molnar" <mingo@redhat.com>, Will Deacon <will@kernel.org>,
        Waiman Long
	<longman@redhat.com>, Boqun Feng <boqun.feng@gmail.com>,
        Jonathan Corbet
	<corbet@lwn.net>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Rob Herring
	<robh@kernel.org>,
        Krzysztof Kozlowski <krzk+dt@kernel.org>,
        Conor Dooley
	<conor+dt@kernel.org>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@linaro.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>
CC: <linux-remoteproc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-doc@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <devicetree@vger.kernel.org>, Chris Lew <quic_clew@quicinc.com>,
        "Richard
 Maina" <quic_rmaina@quicinc.com>

From: Richard Maina <quic_rmaina@quicinc.com>

When a remoteproc crashes or goes down unexpectedly this can result in
a state where locks held by the remoteproc will remain locked possibly
resulting in deadlock. This new API hwspin_lock_bust() allows
hwspinlock implementers to define a bust operation for freeing previously
acquired hwspinlocks after verifying ownership of the acquired lock.

Signed-off-by: Richard Maina <quic_rmaina@quicinc.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
---
 Documentation/locking/hwspinlock.rst     | 11 +++++++++++
 drivers/hwspinlock/hwspinlock_core.c     | 28 ++++++++++++++++++++++++++++
 drivers/hwspinlock/hwspinlock_internal.h |  3 +++
 include/linux/hwspinlock.h               |  6 ++++++
 4 files changed, 48 insertions(+)

diff --git a/Documentation/locking/hwspinlock.rst b/Documentation/locking/hwspinlock.rst
index 6f03713b7003..2ffaa3cbd63f 100644
--- a/Documentation/locking/hwspinlock.rst
+++ b/Documentation/locking/hwspinlock.rst
@@ -85,6 +85,17 @@ is already free).
 
 Should be called from a process context (might sleep).
 
+::
+
+  int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id);
+
+After verifying the owner of the hwspinlock, release a previously acquired
+hwspinlock; returns 0 on success, or an appropriate error code on failure
+(e.g. -EOPNOTSUPP if the bust operation is not defined for the specific
+hwspinlock).
+
+Should be called from a process context (might sleep).
+
 ::
 
   int hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int timeout);
diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 0c0a932c00f3..6505261e6068 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -305,6 +305,34 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 }
 EXPORT_SYMBOL_GPL(__hwspin_unlock);
 
+/**
+ * hwspin_lock_bust() - bust a specific hwspinlock
+ * @hwlock: a previously-acquired hwspinlock which we want to bust
+ * @id: identifier of the remote lock holder, if applicable
+ *
+ * This function will bust a hwspinlock that was previously acquired as
+ * long as the current owner of the lock matches the id given by the caller.
+ *
+ * Context: Process context.
+ *
+ * Returns: 0 on success, or -EINVAL if the hwspinlock does not exist, or
+ * the bust operation fails, and -EOPNOTSUPP if the bust operation is not
+ * defined for the hwspinlock.
+ */
+int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id)
+{
+	if (WARN_ON(!hwlock))
+		return -EINVAL;
+
+	if (!hwlock->bank->ops->bust) {
+		pr_err("bust operation not defined\n");
+		return -EOPNOTSUPP;
+	}
+
+	return hwlock->bank->ops->bust(hwlock, id);
+}
+EXPORT_SYMBOL_GPL(hwspin_lock_bust);
+
 /**
  * of_hwspin_lock_simple_xlate - translate hwlock_spec to return a lock id
  * @hwlock_spec: hwlock specifier as found in the device tree
diff --git a/drivers/hwspinlock/hwspinlock_internal.h b/drivers/hwspinlock/hwspinlock_internal.h
index 29892767bb7a..f298fc0ee5ad 100644
--- a/drivers/hwspinlock/hwspinlock_internal.h
+++ b/drivers/hwspinlock/hwspinlock_internal.h
@@ -21,6 +21,8 @@ struct hwspinlock_device;
  * @trylock: make a single attempt to take the lock. returns 0 on
  *	     failure and true on success. may _not_ sleep.
  * @unlock:  release the lock. always succeed. may _not_ sleep.
+ * @bust:    optional, platform-specific bust handler, called by hwspinlock
+ *	     core to bust a specific lock.
  * @relax:   optional, platform-specific relax handler, called by hwspinlock
  *	     core while spinning on a lock, between two successive
  *	     invocations of @trylock. may _not_ sleep.
@@ -28,6 +30,7 @@ struct hwspinlock_device;
 struct hwspinlock_ops {
 	int (*trylock)(struct hwspinlock *lock);
 	void (*unlock)(struct hwspinlock *lock);
+	int (*bust)(struct hwspinlock *lock, unsigned int id);
 	void (*relax)(struct hwspinlock *lock);
 };
 
diff --git a/include/linux/hwspinlock.h b/include/linux/hwspinlock.h
index bfe7c1f1ac6d..f0231dbc4777 100644
--- a/include/linux/hwspinlock.h
+++ b/include/linux/hwspinlock.h
@@ -68,6 +68,7 @@ int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int,
 int __hwspin_trylock(struct hwspinlock *, int, unsigned long *);
 void __hwspin_unlock(struct hwspinlock *, int, unsigned long *);
 int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name);
+int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id);
 int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock);
 struct hwspinlock *devm_hwspin_lock_request(struct device *dev);
 struct hwspinlock *devm_hwspin_lock_request_specific(struct device *dev,
@@ -127,6 +128,11 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 {
 }
 
+static inline int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id)
+{
+	return 0;
+}
+
 static inline int of_hwspin_lock_get_id(struct device_node *np, int index)
 {
 	return 0;

-- 
2.25.1