linux-kernel - Re: [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set whether the controller is started

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Message-ID: <1253c4c9-4e5e-1456-6475-0334f3bb8634@ti.com>
Date:   Thu, 28 Jan 2021 19:41:57 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set
 whether the controller is started

Hi Kunihiko,

On 24/01/21 8:39 pm, Kunihiko Hayashi wrote:
> This adds a member 'started' as a boolean value to struct pci_epc to set
> whether the controller is started, and also adds a function to get the
> value.
> 
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> ---
>  drivers/pci/endpoint/pci-epc-core.c | 2 ++
>  include/linux/pci-epc.h             | 7 +++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index cc8f9eb..2904175 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -174,6 +174,7 @@ void pci_epc_stop(struct pci_epc *epc)
>  
>  	mutex_lock(&epc->lock);
>  	epc->ops->stop(epc);
> +	epc->started = false;
>  	mutex_unlock(&epc->lock);
>  }
>  EXPORT_SYMBOL_GPL(pci_epc_stop);
> @@ -196,6 +197,7 @@ int pci_epc_start(struct pci_epc *epc)
>  
>  	mutex_lock(&epc->lock);
>  	ret = epc->ops->start(epc);
> +	epc->started = true;
>  	mutex_unlock(&epc->lock);
>  
>  	return ret;
> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
> index b82c9b1..5808952 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -131,6 +131,7 @@ struct pci_epc_mem {
>   * @lock: mutex to protect pci_epc ops
>   * @function_num_map: bitmap to manage physical function number
>   * @notifier: used to notify EPF of any EPC events (like linkup)
> + * @started: true if this EPC is started
>   */
>  struct pci_epc {
>  	struct device			dev;
> @@ -145,6 +146,7 @@ struct pci_epc {
>  	struct mutex			lock;
>  	unsigned long			function_num_map;
>  	struct atomic_notifier_head	notifier;
> +	bool				started;
>  };
>  
>  /**
> @@ -191,6 +193,11 @@ pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
>  	return atomic_notifier_chain_register(&epc->notifier, nb);
>  }
>  
> +static inline bool pci_epc_is_started(struct pci_epc *epc)
> +{
> +	return epc->started;
> +}

This should also be protected.

Thanks
Kishon
> +
>  struct pci_epc *
>  __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
>  		      struct module *owner);
>