linux-kernel - Re: [PATCH 1/2] PM: domains: add device managed version of dev_pm_domain_attach|detach

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Message-ID: <08860213-8933-4092-9345-9bd780019a2d@quicinc.com>
Date: Tue, 16 Jul 2024 09:41:16 +0530
From: Pavan Kondeti <quic_pkondeti@...cinc.com>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>
CC: "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>,
        "Len
 Brown" <len.brown@...el.com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Stanimir Varbanov
	<stanimir.k.varbanov@...il.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio"
	<konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Ulf
 Hansson <ulf.hansson@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Stanimir Varbanov
	<stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab
	<mchehab+huawei@...nel.org>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 1/2] PM: domains: add device managed version of
 dev_pm_domain_attach|detach_list()

On Fri, Jul 12, 2024 at 11:18:30AM +0530, Dikshita Agarwal wrote:
> This patch adds the devres-enabled version of dev_pm_domain_attach|detach_list.
> If client drivers use devm_pm_domain_attach_list() to attach the PM domains,
> devm_pm_domain_detach_list() will be invoked implicitly during remove phase.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
>  drivers/base/power/common.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/pm_domain.h   |  4 ++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
> index 327d168..082691e 100644
> --- a/drivers/base/power/common.c
> +++ b/drivers/base/power/common.c
> @@ -277,6 +277,47 @@ int dev_pm_domain_attach_list(struct device *dev,
>  EXPORT_SYMBOL_GPL(dev_pm_domain_attach_list);
>  
>  /**
> + * dev_pm_domain_detach_list - devres-enabled version of dev_pm_domain_detach_list.
> + * @list: The list of PM domains to detach.
> + *
> + * This function reverse the actions from devm_pm_domain_attach_list().
> + * it will be invoked during the remove phase from drivers implicitly if driver
> + * uses devm_pm_domain_attach_list() to attach the PM domains.
> + */
> +void devm_pm_domain_detach_list(void *_list)
> +{
> +	struct dev_pm_domain_list *list = _list;
> +
> +	dev_pm_domain_detach_list(list);
> +}
> +EXPORT_SYMBOL_GPL(devm_pm_domain_detach_list);
> +
> +/**
> + * devm_pm_domain_attach_list - devres-enabled version of dev_pm_domain_attach_list
> + *
> + * NOTE: this will also handle calling devm_pm_domain_detach_list() for
> + * you during remove phase.
> + *
> + * Returns the number of attached PM domains or a negative error code in case of
> + * a failure.
> + */
> +int devm_pm_domain_attach_list(struct device *dev,
> +			       const struct dev_pm_domain_attach_data *data,
> +			       struct dev_pm_domain_list **list)
> +{
> +	int ret, num_pds = 0;
> +
> +	num_pds = dev_pm_domain_attach_list(dev, data, list);
> +
> +	ret = devm_add_action_or_reset(dev, devm_pm_domain_detach_list, (void *)list);
> +	if (ret)
> +		return ret;
> +
> +	return num_pds;
> +}
> +EXPORT_SYMBOL_GPL(devm_pm_domain_attach_list);
> +
> +/**
>   * dev_pm_domain_detach - Detach a device from its PM domain.
>   * @dev: Device to detach.
>   * @power_off: Used to indicate whether we should power off the device.
> diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> index 772d328..2f00150 100644
> --- a/include/linux/pm_domain.h
> +++ b/include/linux/pm_domain.h
> @@ -450,8 +450,12 @@ struct device *dev_pm_domain_attach_by_name(struct device *dev,
>  int dev_pm_domain_attach_list(struct device *dev,
>  			      const struct dev_pm_domain_attach_data *data,
>  			      struct dev_pm_domain_list **list);
> +int devm_pm_domain_attach_list(struct device *dev,
> +			       const struct dev_pm_domain_attach_data *data,
> +			       struct dev_pm_domain_list **list);
>  void dev_pm_domain_detach(struct device *dev, bool power_off);
>  void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
> +void devm_pm_domain_detach_list(void *list);
>  int dev_pm_domain_start(struct device *dev);
>  void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
>  int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);

The stub functions for the newly added functions are missing in this
patch. They would be needed for !CONFIG_PM case.

Thanks,
Pavan