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SubjectRe: [PATCH v3 09/21] fpga: intel-dfl-pci: add enumeration for feature devices
On Mon, Nov 27, 2017 at 12:42 AM, Wu Hao <hao.wu@intel.com> wrote:

> +/* 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 fpga_cdev *cdev;
> + struct fpga_enum_info *info;
> + resource_size_t start, len;
> + void __iomem *base;
> + int port_num, bar, i, ret = 0;
> + u32 offset;
> + u64 v;
> +
> + /* allocate enumeration info via pci_dev */
> + info = fpga_enum_info_alloc(&pcidev->dev);
> + if (!info)
> + return -ENOMEM;
> +
> + /* start to find Device Feature List from Bar 0 */
> + base = cci_pci_ioremap_bar(pcidev, 0);
> + if (!base) {
> + ret = -ENOMEM;
> + goto enum_info_free_exit;
> + }
> +
> + /*
> + * PF device has FME and Ports/AFUs, and VF device only has 1 Port/AFU.
> + * check them and add related "Device Feature List" info for the next
> + * step enumeration.
> + */
> + if (feature_is_fme(base)) {
> + start = pci_resource_start(pcidev, 0);
> + len = pci_resource_len(pcidev, 0);
> +
> + fpga_enum_info_add_dfl(info, start, len, base);
> +
> + /*
> + * find more Device Feature Lists (e.g Ports) per information
> + * indicated by FME module.
> + */
> + v = readq(base + FME_HDR_CAP);
> + port_num = FIELD_GET(FME_CAP_NUM_PORTS, v);
> +
> + WARN_ON(port_num > MAX_FPGA_PORT_NUM);
> +
> + for (i = 0; i < port_num; i++) {
> + v = readq(base + FME_HDR_PORT_OFST(i));
> +
> + /* skip ports which are not implemented. */
> + if (!(v & FME_PORT_OFST_IMP))
> + continue;
> +
> + /*
> + * add Port's Device Feature List information for next
> + * step enumeration.
> + */
> + bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
> + offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
> + base = cci_pci_ioremap_bar(pcidev, bar);
> + if (!base)
> + continue;
> +
> + start = pci_resource_start(pcidev, bar) + offset;
> + len = pci_resource_len(pcidev, bar) - offset;
> +
> + fpga_enum_info_add_dfl(info, start, len, base + offset);
> + }
> + } else if (feature_is_port(base)) {
> + start = pci_resource_start(pcidev, 0);
> + len = pci_resource_len(pcidev, 0);
> +
> + fpga_enum_info_add_dfl(info, start, len, base);
> + } else {
> + ret = -ENODEV;
> + goto enum_info_free_exit;
> + }
> +
> + /* start enumeration with prepared enumeration information */
> + cdev = fpga_enumerate_feature_devs(info);

Hi Hao,

I appreciate you separating the DFL enumeration code from this PCIe
module. This made the pcie part quite small. It should work for
embedded platforms just by adding a platform device whose function is
to find the DFL structures at some address and then call these same
fpga_enum_info_add_dfl adn fpga_enumerate_feature_devs functions.

Alan

> + if (IS_ERR(cdev)) {
> + dev_err(&pcidev->dev, "Enumeration failure\n");
> + ret = PTR_ERR(cdev);
> + goto enum_info_free_exit;
> + }
> +
> + drvdata->cdev = cdev;
> +
> +enum_info_free_exit:
> + fpga_enum_info_free(info);
> +
> + return ret;
> +}
> +
> static
> int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
> {
> @@ -84,9 +264,22 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
> goto release_region_exit;
> }
>
> - /* TODO: create and add the platform device per feature list */
> - return 0;
> + ret = cci_init_drvdata(pcidev);
> + if (ret) {
> + dev_err(&pcidev->dev, "Fail to init drvdata %d.\n", ret);
> + goto release_region_exit;
> + }
> +
> + ret = cci_enumerate_feature_devs(pcidev);
> + if (ret) {
> + dev_err(&pcidev->dev, "enumeration failure %d.\n", ret);
> + goto remove_drvdata_exit;
> + }
> +
> + return ret;
>
> +remove_drvdata_exit:
> + cci_remove_drvdata(pcidev);
> release_region_exit:
> pci_release_regions(pcidev);
> disable_error_report_exit:
> @@ -97,6 +290,8 @@ int cci_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *pcidevid)
>
> static void cci_pci_remove(struct pci_dev *pcidev)
> {
> + cci_remove_feature_devs(pcidev);
> + cci_remove_drvdata(pcidev);
> pci_release_regions(pcidev);
> pci_disable_pcie_error_reporting(pcidev);
> pci_disable_device(pcidev);
> --
> 1.8.3.1
>

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