// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2020
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*
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* Author(s):
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* Niklas Schnelle <schnelle@linux.ibm.com>
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*
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*/
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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include "pci_iov.h"
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static struct resource iov_res = {
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.name = "PCI IOV res",
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.start = 0,
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.end = -1,
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.flags = IORESOURCE_MEM,
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};
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void zpci_iov_map_resources(struct pci_dev *pdev)
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{
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resource_size_t len;
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int i;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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int bar = i + PCI_IOV_RESOURCES;
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len = pci_resource_len(pdev, bar);
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if (!len)
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continue;
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pdev->resource[bar].parent = &iov_res;
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}
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}
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void zpci_iov_remove_virtfn(struct pci_dev *pdev, int vfn)
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{
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pci_lock_rescan_remove();
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/* Linux' vfid's start at 0 vfn at 1 */
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pci_iov_remove_virtfn(pdev->physfn, vfn - 1);
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pci_unlock_rescan_remove();
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}
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static int zpci_iov_link_virtfn(struct pci_dev *pdev, struct pci_dev *virtfn, int vfid)
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{
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int rc;
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rc = pci_iov_sysfs_link(pdev, virtfn, vfid);
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if (rc)
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return rc;
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virtfn->is_virtfn = 1;
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virtfn->multifunction = 0;
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virtfn->physfn = pci_dev_get(pdev);
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return 0;
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}
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int zpci_iov_setup_virtfn(struct zpci_bus *zbus, struct pci_dev *virtfn, int vfn)
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{
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int i, cand_devfn;
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struct zpci_dev *zdev;
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struct pci_dev *pdev;
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int vfid = vfn - 1; /* Linux' vfid's start at 0 vfn at 1*/
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int rc = 0;
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if (!zbus->multifunction)
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return 0;
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/* If the parent PF for the given VF is also configured in the
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* instance, it must be on the same zbus.
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* We can then identify the parent PF by checking what
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* devfn the VF would have if it belonged to that PF using the PF's
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* stride and offset. Only if this candidate devfn matches the
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* actual devfn will we link both functions.
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*/
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for (i = 0; i < ZPCI_FUNCTIONS_PER_BUS; i++) {
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zdev = zbus->function[i];
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if (zdev && zdev->is_physfn) {
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pdev = pci_get_slot(zbus->bus, zdev->devfn);
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if (!pdev)
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continue;
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cand_devfn = pci_iov_virtfn_devfn(pdev, vfid);
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if (cand_devfn == virtfn->devfn) {
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rc = zpci_iov_link_virtfn(pdev, virtfn, vfid);
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/* balance pci_get_slot() */
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pci_dev_put(pdev);
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break;
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}
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/* balance pci_get_slot() */
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pci_dev_put(pdev);
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}
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}
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return rc;
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}
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