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hwspinlock: qcom: implement bust operation

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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: Richard Maina <quic_rmaina@quicinc.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-2-c8b924ffa5a2@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Richard Maina 2024-05-29 11:09:56 -07:00 committed by Bjorn Andersson
parent 7c327d5659
commit 73100deb59
1 changed files with 25 additions and 0 deletions
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25
drivers/hwspinlock/qcom_hwspinlock.c
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@ -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 = {