On Tue 28 Apr 15:16 PDT 2020, Rishabh Bhatnagar wrote:
> From: Siddharth Gupta <sidgup@xxxxxxxxxxxxxx>
>
> The SSR subdevice only adds callback for the unprepare event. Add callbacks
> for unprepare, start and prepare events. The client driver for a particular
> remoteproc might be interested in knowing the status of the remoteproc
> while undergoing SSR, not just when the remoteproc has finished shutting
> down.
>
> Signed-off-by: Siddharth Gupta <sidgup@xxxxxxxxxxxxxx>
> Signed-off-by: Rishabh Bhatnagar <rishabhb@xxxxxxxxxxxxxx>
> ---
> drivers/remoteproc/qcom_common.c | 46 +++++++++++++++++++++++++++++++++--
> include/linux/remoteproc/qcom_rproc.h | 14 +++++++++++
> 2 files changed, 58 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
> index 7cd17be..0d91cf3 100644
> --- a/drivers/remoteproc/qcom_common.c
> +++ b/drivers/remoteproc/qcom_common.c
> @@ -197,7 +197,7 @@ struct rproc_notif_info *find_notif_info(const char *name)
> *
> * This registers the @nb notifier block as part the notifier chain for a
> * remoteproc associated with @name. The notifier block's callback
> - * will be invoked when the particular remote processor is stopped.
> + * will be invoked when the particular remote processor is started/stopped.
> */
> void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
> {
> @@ -239,6 +239,44 @@ int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
> }
> EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
>
> +static int ssr_notify_prepare(struct rproc_subdev *subdev)
> +{
> + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> + struct rproc_notif_data data = {
> + .name = ssr->info->name,
> + .crashed = false,
> + };
> +
> + srcu_notifier_call_chain(&ssr->info->notifier_list,
> + RPROC_BEFORE_POWERUP, &data);
> + return 0;
> +}
> +
> +static int ssr_notify_start(struct rproc_subdev *subdev)
> +{
> + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> + struct rproc_notif_data data = {
> + .name = ssr->info->name,
> + .crashed = false,
> + };
> +
> + srcu_notifier_call_chain(&ssr->info->notifier_list,
> + RPROC_AFTER_POWERUP, &data);
> + return 0;
> +}
> +
> +static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
> +{
> + struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> + struct rproc_notif_data data = {
> + .name = ssr->info->name,
> + .crashed = crashed,
> + };
> +
> + srcu_notifier_call_chain(&ssr->info->notifier_list,
> + RPROC_BEFORE_SHUTDOWN, &data);
> +}
> +
> static void ssr_notify_unprepare(struct rproc_subdev *subdev)
> {
> struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
> @@ -247,7 +285,8 @@ static void ssr_notify_unprepare(struct rproc_subdev *subdev)
> .crashed = false,
> };
>
> - srcu_notifier_call_chain(&ssr->info->notifier_list, 0, &data);
> + srcu_notifier_call_chain(&ssr->info->notifier_list,
> + RPROC_AFTER_SHUTDOWN, &data);
> }
>
>
> @@ -282,6 +321,9 @@ void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
> }
> mutex_unlock(&rproc_notif_lock);
> ssr->info = info;
> + ssr->subdev.prepare = ssr_notify_prepare;
> + ssr->subdev.start = ssr_notify_start;
> + ssr->subdev.stop = ssr_notify_stop;
> ssr->subdev.unprepare = ssr_notify_unprepare;
>
> rproc_add_subdev(rproc, &ssr->subdev);
> diff --git a/include/linux/remoteproc/qcom_rproc.h b/include/linux/remoteproc/qcom_rproc.h
> index 3dc65c0..567c1f9 100644
> --- a/include/linux/remoteproc/qcom_rproc.h
> +++ b/include/linux/remoteproc/qcom_rproc.h
> @@ -5,6 +5,20 @@
>
> #if IS_ENABLED(CONFIG_QCOM_RPROC_COMMON)
>
> +/**
> + * enum rproc_notif_type - Different stages of remoteproc notifications
> + * @RPROC_BEFORE_SHUTDOWN: unprepare stage of remoteproc
> + * @RPROC_AFTER_SHUTDOWN: stop stage of remoteproc
> + * @RPROC_BEFORE_POWERUP: prepare stage of remoteproc
> + * @RPROC_AFTER_POWERUP: start stage of remoteproc
> + */
> +enum rproc_notif_type {
> + RPROC_BEFORE_SHUTDOWN,
> + RPROC_AFTER_SHUTDOWN,
> + RPROC_BEFORE_POWERUP,
> + RPROC_AFTER_POWERUP,
Given that these are not generic remoteproc things I would like a qcom
prefix on them.
How about QCOM_SSR_BEFORE_SHUTDOWN ...
Apart from that, this looks good.
Thanks,
Bjorn
> +};
> +
> struct rproc_notif_data {
> const char *name;
> bool crashed;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
