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| author | Richard Maina <quic_rmaina@quicinc.com> | 2024-05-29 11:09:56 -0700 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2024-05-29 12:52:26 -0700 |
| commit | 73100deb59c3892e280234fcc0171a5376c71788 (patch) | |
| tree | c7969c714c3867e713619bce748961a5bfdd5b33 /drivers/hwspinlock/qcom_hwspinlock.c | |
| parent | 7c327d56597d8de1680cf24e956b704270d3d84a (diff) | |
| download | lwn-73100deb59c3892e280234fcc0171a5376c71788.tar.gz lwn-73100deb59c3892e280234fcc0171a5376c71788.zip | |
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: 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>
Diffstat (limited to 'drivers/hwspinlock/qcom_hwspinlock.c')
| -rw-r--r-- | drivers/hwspinlock/qcom_hwspinlock.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c index 814dfe8697bf..0390979fd765 100644 --- a/drivers/hwspinlock/qcom_hwspinlock.c +++ b/drivers/hwspinlock/qcom_hwspinlock.c @@ -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 = { |