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Subject: Re: [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set
 whether the controller is started
To:     Kishon Vijay Abraham I <kishon@ti.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>
Cc:     linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@linaro.org>,
        Jassi Brar <jaswinder.singh@linaro.org>
References: <1611500977-24816-1-git-send-email-hayashi.kunihiko@socionext.com>
 <1611500977-24816-2-git-send-email-hayashi.kunihiko@socionext.com>
 <1253c4c9-4e5e-1456-6475-0334f3bb8634@ti.com>
From:   Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Message-ID: <83a6ec4e-3f59-5084-2241-404169d50116@socionext.com>
Date:   Wed, 3 Feb 2021 01:13:26 +0900
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Hi Kishon,

On 2021/01/28 23:11, Kishon Vijay Abraham I wrote:
> 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@socionext.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.

Ok, I prepared this function for restart management in patch 2/3.
This also needs to be reconsidered.

Thank you,

---
Best Regards
Kunihiko Hayashi