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Message-ID: <a5360f12-1687-d03e-6ba4-0f6e487905d5@quicinc.com>
Date:   Fri, 7 Jul 2023 16:22:49 +0530
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Subject: Re: [PATCH v2 1/8] PCI: endpoint: Add dstate change notifier support
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To:     Manivannan Sadhasivam <mani@kernel.org>
CC:     <manivannan.sadhasivam@linaro.org>, <helgaas@kernel.org>,
        <linux-pci@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <quic_vbadigan@quicinc.com>,
        <quic_nitegupt@quicinc.com>, <quic_skananth@quicinc.com>,
        <quic_ramkri@quicinc.com>, <krzysztof.kozlowski@linaro.org>,
        "Lorenzo Pieralisi" <lpieralisi@kernel.org>,
        =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= <kw@linux.com>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jonathan Corbet <corbet@lwn.net>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>
References: <1688122331-25478-1-git-send-email-quic_krichai@quicinc.com>
 <1688122331-25478-2-git-send-email-quic_krichai@quicinc.com>
 <20230707054454.GA6001@thinkpad>
From:   Krishna Chaitanya Chundru <quic_krichai@quicinc.com>
In-Reply-To: <20230707054454.GA6001@thinkpad>
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On 7/7/2023 11:14 AM, Manivannan Sadhasivam wrote:
> On Fri, Jun 30, 2023 at 04:22:04PM +0530, Krishna chaitanya chundru wrote:
>> Add support to notify the EPF device about the D-state change event
>> from the EPC device.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
>> ---
>>   Documentation/PCI/endpoint/pci-endpoint.rst |  5 +++++
>>   drivers/pci/endpoint/pci-epc-core.c         | 27 +++++++++++++++++++++++++++
>>   include/linux/pci-epc.h                     |  1 +
>>   include/linux/pci-epf.h                     |  1 +
>>   4 files changed, 34 insertions(+)
>>
>> diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst
>> index 4f5622a..0538cdc 100644
>> --- a/Documentation/PCI/endpoint/pci-endpoint.rst
>> +++ b/Documentation/PCI/endpoint/pci-endpoint.rst
>> @@ -78,6 +78,11 @@ by the PCI controller driver.
>>      Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init().
>>   
>>   
>> +* pci_epc_dstate_change()
>> +
>> +   In order to notify all the function devices that the EPC device has
>> +   changed its D-state.
>> +
>>   EPC APIs for the PCI Endpoint Function Driver
>>   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>   
>> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
>> index 6c54fa5..cad360f 100644
>> --- a/drivers/pci/endpoint/pci-epc-core.c
>> +++ b/drivers/pci/endpoint/pci-epc-core.c
>> @@ -785,6 +785,33 @@ void pci_epc_bme_notify(struct pci_epc *epc)
>>   EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
>>   
>>   /**
>> + * pci_epc_dstate_change() - Notify the EPF device that EPC device D-state
>> + *			has changed
>> + * @epc: the EPC device which has change in D-state
>> + * @state: the changed D-state
>> + *
>> + * Invoke to Notify the EPF device that the EPC device has D-state has
>> + * changed.
>> + */
>> +void pci_epc_dstate_change(struct pci_epc *epc, pci_power_t state)
> How about "pci_epc_dstate_notity()"?
>
> Rest looks good.
>
> - Mani

sure I will change to pci_epc_dstate_notity

-KC

>
>> +{
>> +	struct pci_epf *epf;
>> +
>> +	if (!epc || IS_ERR(epc))
>> +		return;
>> +
>> +	mutex_lock(&epc->list_lock);
>> +	list_for_each_entry(epf, &epc->pci_epf, list) {
>> +		mutex_lock(&epf->lock);
>> +		if (epf->event_ops && epf->event_ops->dstate_change)
>> +			epf->event_ops->dstate_change(epf, state);
>> +		mutex_unlock(&epf->lock);
>> +	}
>> +	mutex_unlock(&epc->list_lock);
>> +}
>> +EXPORT_SYMBOL_GPL(pci_epc_dstate_change);
>> +
>> +/**
>>    * pci_epc_destroy() - destroy the EPC device
>>    * @epc: the EPC device that has to be destroyed
>>    *
>> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
>> index 5cb6940..26a1108 100644
>> --- a/include/linux/pci-epc.h
>> +++ b/include/linux/pci-epc.h
>> @@ -251,4 +251,5 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
>>   				     phys_addr_t *phys_addr, size_t size);
>>   void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
>>   			   void __iomem *virt_addr, size_t size);
>> +void pci_epc_dstate_change(struct pci_epc *epc, pci_power_t state);
>>   #endif /* __LINUX_PCI_EPC_H */
>> diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
>> index 4b52807..1d3c2a2 100644
>> --- a/include/linux/pci-epf.h
>> +++ b/include/linux/pci-epf.h
>> @@ -79,6 +79,7 @@ struct pci_epc_event_ops {
>>   	int (*link_up)(struct pci_epf *epf);
>>   	int (*link_down)(struct pci_epf *epf);
>>   	int (*bme)(struct pci_epf *epf);
>> +	int (*dstate_change)(struct pci_epf *epf, pci_power_t state);
>>   };
>>   
>>   /**
>> -- 
>> 2.7.4
>>