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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 33 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000435.254582722@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
248 lines
5.4 KiB
C
248 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2009, Intel Corporation.
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*
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* Author: Weidong Han <weidong.han@intel.com>
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*/
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/pci-acpi.h>
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#include <xen/xen.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/xen.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include "../pci/pci.h"
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#ifdef CONFIG_PCI_MMCONFIG
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#include <asm/pci_x86.h>
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#endif
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static bool __read_mostly pci_seg_supported = true;
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static int xen_add_device(struct device *dev)
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{
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int r;
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struct pci_dev *pci_dev = to_pci_dev(dev);
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#ifdef CONFIG_PCI_IOV
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struct pci_dev *physfn = pci_dev->physfn;
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#endif
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if (pci_seg_supported) {
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struct {
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struct physdev_pci_device_add add;
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uint32_t pxm;
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} add_ext = {
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.add.seg = pci_domain_nr(pci_dev->bus),
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.add.bus = pci_dev->bus->number,
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.add.devfn = pci_dev->devfn
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};
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struct physdev_pci_device_add *add = &add_ext.add;
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#ifdef CONFIG_ACPI
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acpi_handle handle;
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#endif
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#ifdef CONFIG_PCI_IOV
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if (pci_dev->is_virtfn) {
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add->flags = XEN_PCI_DEV_VIRTFN;
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add->physfn.bus = physfn->bus->number;
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add->physfn.devfn = physfn->devfn;
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} else
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#endif
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if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
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add->flags = XEN_PCI_DEV_EXTFN;
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#ifdef CONFIG_ACPI
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handle = ACPI_HANDLE(&pci_dev->dev);
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#ifdef CONFIG_PCI_IOV
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if (!handle && pci_dev->is_virtfn)
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handle = ACPI_HANDLE(physfn->bus->bridge);
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#endif
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if (!handle) {
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/*
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* This device was not listed in the ACPI name space at
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* all. Try to get acpi handle of parent pci bus.
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*/
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struct pci_bus *pbus;
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for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
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handle = acpi_pci_get_bridge_handle(pbus);
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if (handle)
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break;
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}
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}
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if (handle) {
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acpi_status status;
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do {
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unsigned long long pxm;
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status = acpi_evaluate_integer(handle, "_PXM",
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NULL, &pxm);
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if (ACPI_SUCCESS(status)) {
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add->optarr[0] = pxm;
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add->flags |= XEN_PCI_DEV_PXM;
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break;
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}
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status = acpi_get_parent(handle, &handle);
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} while (ACPI_SUCCESS(status));
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}
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#endif /* CONFIG_ACPI */
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r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add);
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if (r != -ENOSYS)
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return r;
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pci_seg_supported = false;
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}
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if (pci_domain_nr(pci_dev->bus))
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r = -ENOSYS;
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#ifdef CONFIG_PCI_IOV
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else if (pci_dev->is_virtfn) {
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struct physdev_manage_pci_ext manage_pci_ext = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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.is_virtfn = 1,
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.physfn.bus = physfn->bus->number,
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.physfn.devfn = physfn->devfn,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
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&manage_pci_ext);
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}
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#endif
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else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
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struct physdev_manage_pci_ext manage_pci_ext = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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.is_extfn = 1,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
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&manage_pci_ext);
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} else {
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struct physdev_manage_pci manage_pci = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn,
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
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&manage_pci);
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}
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return r;
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}
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static int xen_remove_device(struct device *dev)
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{
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int r;
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struct pci_dev *pci_dev = to_pci_dev(dev);
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if (pci_seg_supported) {
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struct physdev_pci_device device = {
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.seg = pci_domain_nr(pci_dev->bus),
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
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&device);
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} else if (pci_domain_nr(pci_dev->bus))
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r = -ENOSYS;
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else {
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struct physdev_manage_pci manage_pci = {
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.bus = pci_dev->bus->number,
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.devfn = pci_dev->devfn
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};
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r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
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&manage_pci);
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}
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return r;
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}
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static int xen_pci_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct device *dev = data;
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int r = 0;
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switch (action) {
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case BUS_NOTIFY_ADD_DEVICE:
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r = xen_add_device(dev);
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break;
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case BUS_NOTIFY_DEL_DEVICE:
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r = xen_remove_device(dev);
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break;
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default:
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return NOTIFY_DONE;
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}
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if (r)
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dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
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action == BUS_NOTIFY_ADD_DEVICE ? "add" :
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(action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
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return NOTIFY_OK;
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}
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static struct notifier_block device_nb = {
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.notifier_call = xen_pci_notifier,
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};
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static int __init register_xen_pci_notifier(void)
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{
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if (!xen_initial_domain())
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return 0;
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return bus_register_notifier(&pci_bus_type, &device_nb);
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}
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arch_initcall(register_xen_pci_notifier);
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#ifdef CONFIG_PCI_MMCONFIG
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static int __init xen_mcfg_late(void)
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{
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struct pci_mmcfg_region *cfg;
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int rc;
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if (!xen_initial_domain())
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return 0;
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if ((pci_probe & PCI_PROBE_MMCONF) == 0)
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return 0;
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if (list_empty(&pci_mmcfg_list))
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return 0;
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/* Check whether they are in the right area. */
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list_for_each_entry(cfg, &pci_mmcfg_list, list) {
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struct physdev_pci_mmcfg_reserved r;
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r.address = cfg->address;
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r.segment = cfg->segment;
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r.start_bus = cfg->start_bus;
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r.end_bus = cfg->end_bus;
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r.flags = XEN_PCI_MMCFG_RESERVED;
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
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switch (rc) {
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case 0:
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case -ENOSYS:
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continue;
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default:
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pr_warn("Failed to report MMCONFIG reservation"
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" state for %s to hypervisor"
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" (%d)\n",
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cfg->name, rc);
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}
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}
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return 0;
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}
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/*
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* Needs to be done after acpi_init which are subsys_initcall.
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*/
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subsys_initcall_sync(xen_mcfg_late);
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#endif
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