linux-kernel - Re: [PATCH 1/2] fpga: dfl: refactor cci_enumerate_feature

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Date:   Tue, 17 Nov 2020 12:01:20 -0800
From:   Tom Rix <trix@...hat.com>
To:     matthew.gerlach@...ux.intel.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, mdf@...nel.org, hao.wu@...el.com,
        linux-doc@...r.kernel.org, corbet@....net
Subject: Re: [PATCH 1/2] fpga: dfl: refactor cci_enumerate_feature_devs()


On 11/16/20 5:25 PM, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
>
> In preparation of looking for dfls based on a vendor
> specific pcie capability, move code that assumes
> Bar0/offset0 as start of DFL to its own function.
>
> Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
> ---
>  drivers/fpga/dfl-pci.c | 86 ++++++++++++++++++++++++------------------
>  1 file changed, 49 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> index a2203d03c9e2..b1b157b41942 100644
> --- a/drivers/fpga/dfl-pci.c
> +++ b/drivers/fpga/dfl-pci.c
> @@ -119,49 +119,20 @@ static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
>  	return table;
>  }
>  
> -/* enumerate feature devices under pci device */
> -static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> +static int find_dfl_in_bar0(struct pci_dev *pcidev,
> +			    struct dfl_fpga_enum_info *info)
>  {
> -	struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
> -	int port_num, bar, i, nvec, ret = 0;
> -	struct dfl_fpga_enum_info *info;
> -	struct dfl_fpga_cdev *cdev;
>  	resource_size_t start, len;
> +	int port_num, bar, i;
>  	void __iomem *base;
> -	int *irq_table;
> +	int ret = 0;
>  	u32 offset;
>  	u64 v;
>  
> -	/* allocate enumeration info via pci_dev */
> -	info = dfl_fpga_enum_info_alloc(&pcidev->dev);
> -	if (!info)
> -		return -ENOMEM;
> -
> -	/* add irq info for enumeration if the device support irq */
> -	nvec = cci_pci_alloc_irq(pcidev);
> -	if (nvec < 0) {
> -		dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
> -		ret = nvec;
> -		goto enum_info_free_exit;
> -	} else if (nvec) {
> -		irq_table = cci_pci_create_irq_table(pcidev, nvec);
> -		if (!irq_table) {
> -			ret = -ENOMEM;
> -			goto irq_free_exit;
> -		}
> -
> -		ret = dfl_fpga_enum_info_add_irq(info, nvec, irq_table);
> -		kfree(irq_table);
> -		if (ret)
> -			goto irq_free_exit;
> -	}
> -
> -	/* start to find Device Feature List in Bar 0 */
> +	/* start to find Device Feature List from Bar 0 */
>  	base = cci_pci_ioremap_bar0(pcidev);
> -	if (!base) {
> -		ret = -ENOMEM;
> -		goto irq_free_exit;
> -	}
> +	if (!base)
> +		return -ENOMEM;
>  
>  	/*
>  	 * PF device has FME and Ports/AFUs, and VF device only has one
> @@ -208,12 +179,53 @@ static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
>  		dfl_fpga_enum_info_add_dfl(info, start, len);
>  	} else {
>  		ret = -ENODEV;
> -		goto irq_free_exit;
>  	}
>  
>  	/* release I/O mappings for next step enumeration */
>  	pcim_iounmap_regions(pcidev, BIT(0));
This ws was already commented on.
>  
> +
> +	return ret;
> +}
> +
> +/* enumerate feature devices under pci device */
> +static int cci_enumerate_feature_devs(struct pci_dev *pcidev)
> +{
> +	struct cci_drvdata *drvdata = pci_get_drvdata(pcidev);
> +	struct dfl_fpga_enum_info *info;
> +	struct dfl_fpga_cdev *cdev;
> +	int nvec, ret = 0;
> +	int *irq_table;
> +
> +	/* allocate enumeration info via pci_dev */
> +	info = dfl_fpga_enum_info_alloc(&pcidev->dev);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	/* add irq info for enumeration if the device support irq */
> +	nvec = cci_pci_alloc_irq(pcidev);
> +	if (nvec < 0) {
> +		dev_err(&pcidev->dev, "Fail to alloc irq %d.\n", nvec);
> +		ret = nvec;
> +		goto enum_info_free_exit;
> +	} else if (nvec) {
> +		irq_table = cci_pci_create_irq_table(pcidev, nvec);
> +		if (!irq_table) {
> +			ret = -ENOMEM;
> +			goto irq_free_exit;
> +		}
> +
> +		ret = dfl_fpga_enum_info_add_irq(info, nvec, irq_table);
> +		kfree(irq_table);
> +		if (ret)
> +			goto irq_free_exit;
> +	}
> +
> +	ret = find_dfl_in_bar0(pcidev, info);
> +
> +	if (ret)
> +		goto irq_free_exit;
> +
>  	/* start enumeration with prepared enumeration information */
>  	cdev = dfl_fpga_feature_devs_enumerate(info);
>  	if (IS_ERR(cdev)) {

This looks fine.

Reviewed-by: Tom Rix <trix@...hat.com>