Re: [PATCH v4 4/7] PCI: endpoint: pci-epf-test: Simplify pci_epf_test_set_bar() loop

From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Niklas Cassel <cassel@kernel.org>
Cc: "Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Kishon Vijay Abraham I" <kishon@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Shradha Todi" <shradha.t@samsung.com>,
	"Damien Le Moal" <dlemoal@kernel.org>,
	linux-pci@vger.kernel.org
Subject: Re: [PATCH v4 4/7] PCI: endpoint: pci-epf-test: Simplify pci_epf_test_set_bar() loop
Date: Fri, 22 Mar 2024 16:01:32 +0530	[thread overview]
Message-ID: <20240322103132.GB3638@thinkpad> (raw)
In-Reply-To: <20240320113157.322695-5-cassel@kernel.org>

On Wed, Mar 20, 2024 at 12:31:51PM +0100, Niklas Cassel wrote:
> Simplify the loop in pci_epf_test_set_bar().
> If we allocated memory for the BAR, we need to call set_bar() for that
> BAR, if we did not allocated memory for that BAR, we need to skip.
> It is as simple as that. This also matches the logic in
> pci_epf_test_unbind().
> 
> A 64-bit BAR will still only be one allocation, with the BAR succeeding
> the 64-bit BAR being null.
> 
> While at it, remove the misleading comment.
> A EPC .set_bar() callback should never change the epf_bar->flags.
> (E.g. to set a 64-bit BAR if we requested a 32-bit BAR.)
> 
> A .set_bar() callback should do what we request it to do.
> If it can't satisfy the request, it should return an error.
> 
> If platform has a specific requirement, e.g. that a certain BAR has to
> be a 64-bit BAR, then it should specify that by setting the .only_64bit
> flag for that specific BAR in epc_features->bar[], such that
> pci_epf_alloc_space() will return a epf_bar with the 64-bit flag set.
> (Such that .set_bar() will receive a request to set a 64-bit BAR.)
> 
> Signed-off-by: Niklas Cassel <cassel@kernel.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

- Mani

> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 21 ++++---------------
>  1 file changed, 4 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 0a83a1901bb7..faf347216b6b 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -709,31 +709,18 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
>  
>  static int pci_epf_test_set_bar(struct pci_epf *epf)
>  {
> -	int bar, add;
> -	int ret;
> -	struct pci_epf_bar *epf_bar;
> +	int bar, ret;
>  	struct pci_epc *epc = epf->epc;
>  	struct device *dev = &epf->dev;
>  	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
>  	enum pci_barno test_reg_bar = epf_test->test_reg_bar;
> -	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];
> -		/*
> -		 * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
> -		 * if the specific implementation required a 64-bit BAR,
> -		 * even if we only requested a 32-bit BAR.
> -		 */
> -		add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
> -
> -		if (epc_features->bar[bar].type == BAR_RESERVED)
> +	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
> +		if (!epf_test->reg[bar])
>  			continue;
>  
>  		ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
> -				      epf_bar);
> +				      &epf->bar[bar]);
>  		if (ret) {
>  			pci_epf_free_space(epf, epf_test->reg[bar], bar,
>  					   PRIMARY_INTERFACE);
> -- 
> 2.44.0
> 

-- 
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