linux-kernel - Re: [PATCH V2 4/4] PCI: endpoint: Add deinit in epf test driver

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Date:   Tue, 1 Nov 2022 18:24:05 +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 4/4] PCI: endpoint: Add deinit in epf test driver

On Thu, Oct 13, 2022 at 11:48:15PM +0530, Vidya Sagar wrote:
> Add support for clearing the BAR info during the deinitialization phase of
> the epf test driver.
> 

BAR is currently cleared during unbind() time. With this deinit callback, it
has to be removed from unbind().

> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> V2:
> * This is a new patch in this series
> 
>  drivers/pci/endpoint/functions/pci-epf-test.c | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 136470019a24..25ac3d161fac 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -826,6 +826,35 @@ static int pci_epf_test_core_init(struct pci_epf *epf)
>  	return 0;
>  }
>  
> +static int pci_epf_test_clear_bar(struct pci_epf *epf)
> +{
> +	int bar, add;

I don't think "add" is a good variable name. Maybe "bar_type"?

Thanks,
Mani

> +	struct pci_epf_bar *epf_bar;
> +	struct pci_epc *epc = epf->epc;
> +	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> +	const struct pci_epc_features *epc_features;
> +
> +	epc_features = epf_test->epc_features;
> +
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) {
> +		epf_bar = &epf->bar[bar];
> +		add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
> +
> +		if (!!(epc_features->reserved_bar & (1 << bar)))
> +			continue;
> +
> +		pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, epf_bar);
> +	}
> +
> +	return 0;
> +}
> +
> +static int pci_epf_test_core_deinit(struct pci_epf *epf)
> +{
> +	pci_epf_test_clear_bar(epf);
> +	return 0;
> +}
> +
>  int pci_epf_test_link_up(struct pci_epf *epf)
>  {
>  	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> @@ -839,6 +868,7 @@ int pci_epf_test_link_up(struct pci_epf *epf)
>  static const struct pci_epc_event_ops pci_epf_test_event_ops = {
>  	.core_init = pci_epf_test_core_init,
>  	.link_up = pci_epf_test_link_up,
> +	.core_deinit = pci_epf_test_core_deinit,
>  };
>  
>  static int pci_epf_test_alloc_space(struct pci_epf *epf)
> -- 
> 2.17.1
> 

-- 
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