On Fri, May 24, 2024 at 06:26:41PM -0700, Chris Lew wrote:
> From: Richard Maina <quic_rmaina@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> Signed-off-by: Chris Lew <quic_clew@xxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Regards,
Bjorn
> ---
> drivers/hwspinlock/qcom_hwspinlock.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> 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 = {
>
> --
> 2.25.1
>
