Commit 73100deb authored by Richard Maina's avatar Richard Maina Committed by Bjorn Andersson
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hwspinlock: qcom: implement bust operation 



Implement a new operation qcom_hwspinlock_bust() which can be invoked
to bust any locks that are in use when a remoteproc is stopped or
crashed.

Signed-off-by: default avatarRichard Maina <quic_rmaina@quicinc.com>
Reviewed-by: default avatarBjorn Andersson <andersson@kernel.org>
Signed-off-by: default avatarChris Lew <quic_clew@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-2-c8b924ffa5a2@quicinc.com


Signed-off-by: default avatarBjorn Andersson <andersson@kernel.org>
parent 7c327d56

drivers/hwspinlock/qcom_hwspinlock.c

+25 −0
Original line number Diff line number Diff line
@@ -64,9 +64,34 @@ static void qcom_hwspinlock_unlock(struct hwspinlock *lock) 
		pr_err("%s: failed to unlock spinlock\n", __func__);

}



static int qcom_hwspinlock_bust(struct hwspinlock *lock, unsigned int id)

{

	struct regmap_field *field = lock->priv;

	u32 owner;

	int ret;



	ret = regmap_field_read(field, &owner);

	if (ret) {

		dev_err(lock->bank->dev, "unable to query spinlock owner\n");

		return ret;

	}



	if (owner != id)

		return 0;



	ret = regmap_field_write(field, 0);

	if (ret) {

		dev_err(lock->bank->dev, "failed to bust spinlock\n");

		return ret;

	}



	return 0;

}



static const struct hwspinlock_ops qcom_hwspinlock_ops = {

	.trylock	= qcom_hwspinlock_trylock,

	.unlock		= qcom_hwspinlock_unlock,

	.bust		= qcom_hwspinlock_bust,

};



static const struct regmap_config sfpb_mutex_config = {