linux-kernel - Re: [PATCH V2 1/4] PCI: endpoint: Add core

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Message-ID: <20221101124200.GL54667@thinkpad>
Date:   Tue, 1 Nov 2022 18:12:00 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        lpieralisi@...nel.org, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, kishon@...com, thierry.reding@...il.com,
        jonathanh@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V2 1/4] PCI: endpoint: Add core_deinit() callback support

On Thu, Oct 13, 2022 at 11:48:12PM +0530, Vidya Sagar wrote:
> The endpoint function driver should undo the things done in core_init()
> and stop hardware access before deinitializing the controller. Add
> core_deinit() callback support for function driver to do this cleanup.
> This core_deinit() callback should be invoked by the controller driver
> before deinitializing the controller.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> V2:
> * Reworded the commit message
> 
>  drivers/pci/endpoint/pci-epc-core.c | 26 ++++++++++++++++++++++++++
>  include/linux/pci-epc.h             |  1 +
>  include/linux/pci-epf.h             |  2 ++
>  3 files changed, 29 insertions(+)
> 
> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
> index 5dac1496cf16..689450f01f75 100644
> --- a/drivers/pci/endpoint/pci-epc-core.c
> +++ b/drivers/pci/endpoint/pci-epc-core.c
> @@ -732,6 +732,32 @@ void pci_epc_init_notify(struct pci_epc *epc)
>  }
>  EXPORT_SYMBOL_GPL(pci_epc_init_notify);
>  
> +/**
> + * pci_epc_deinit_notify() - Notify the EPF device that EPC device's core
> + *			     deinitialization is scheduled.
> + * @epc: the EPC device whose core deinitialization is scheduled
> + *
> + * Invoke to Notify the EPF device that the EPC device's deinitialization
> + * is scheduled.
> + */
> +void pci_epc_deinit_notify(struct pci_epc *epc)
> +{
> +	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->core_deinit)

I've added a check for the existence of the "event_ops" in latest series.
Please rebase on top of that and add the check here too.

Thanks,
Mani

> +			epf->event_ops->core_deinit(epf);
> +		mutex_unlock(&epf->lock);
> +	}
> +	mutex_unlock(&epc->list_lock);
> +}
> +EXPORT_SYMBOL_GPL(pci_epc_deinit_notify);
> +
>  /**
>   * 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 301bb0e53707..b95dc4b3e302 100644
> --- a/include/linux/pci-epc.h
> +++ b/include/linux/pci-epc.h
> @@ -204,6 +204,7 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
>  		    enum pci_epc_interface_type type);
>  void pci_epc_linkup(struct pci_epc *epc);
>  void pci_epc_init_notify(struct pci_epc *epc);
> +void pci_epc_deinit_notify(struct pci_epc *epc);
>  void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
>  			enum pci_epc_interface_type type);
>  int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
> diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
> index a215dc8ce693..fa51579951db 100644
> --- a/include/linux/pci-epf.h
> +++ b/include/linux/pci-epf.h
> @@ -70,10 +70,12 @@ struct pci_epf_ops {
>  /**
>   * struct pci_epf_event_ops - Callbacks for capturing the EPC events
>   * @core_init: Callback for the EPC initialization complete event
> + * @core_deinit: Callback for the EPC deinitialization schedule event
>   * @link_up: Callback for the EPC link up event
>   */
>  struct pci_epc_event_ops {
>  	int (*core_init)(struct pci_epf *epf);
> +	int (*core_deinit)(struct pci_epf *epf);
>  	int (*link_up)(struct pci_epf *epf);
>  };
>  
> -- 
> 2.17.1
> 

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