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linux-next/drivers/xen/pci.c
Thomas Gleixner 3b20eb2372 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 320
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>
2019-06-05 17:37:05 +02:00

248 lines
5.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2009, Intel Corporation.
*
* Author: Weidong Han <weidong.han@intel.com>
*/
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/pci-acpi.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include <xen/interface/xen.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
#ifdef CONFIG_PCI_MMCONFIG
#include <asm/pci_x86.h>
#endif
static bool __read_mostly pci_seg_supported = true;
static int xen_add_device(struct device *dev)
{
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
#ifdef CONFIG_PCI_IOV
struct pci_dev *physfn = pci_dev->physfn;
#endif
if (pci_seg_supported) {
struct {
struct physdev_pci_device_add add;
uint32_t pxm;
} add_ext = {
.add.seg = pci_domain_nr(pci_dev->bus),
.add.bus = pci_dev->bus->number,
.add.devfn = pci_dev->devfn
};
struct physdev_pci_device_add *add = &add_ext.add;
#ifdef CONFIG_ACPI
acpi_handle handle;
#endif
#ifdef CONFIG_PCI_IOV
if (pci_dev->is_virtfn) {
add->flags = XEN_PCI_DEV_VIRTFN;
add->physfn.bus = physfn->bus->number;
add->physfn.devfn = physfn->devfn;
} else
#endif
if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
add->flags = XEN_PCI_DEV_EXTFN;
#ifdef CONFIG_ACPI
handle = ACPI_HANDLE(&pci_dev->dev);
#ifdef CONFIG_PCI_IOV
if (!handle && pci_dev->is_virtfn)
handle = ACPI_HANDLE(physfn->bus->bridge);
#endif
if (!handle) {
/*
* This device was not listed in the ACPI name space at
* all. Try to get acpi handle of parent pci bus.
*/
struct pci_bus *pbus;
for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
handle = acpi_pci_get_bridge_handle(pbus);
if (handle)
break;
}
}
if (handle) {
acpi_status status;
do {
unsigned long long pxm;
status = acpi_evaluate_integer(handle, "_PXM",
NULL, &pxm);
if (ACPI_SUCCESS(status)) {
add->optarr[0] = pxm;
add->flags |= XEN_PCI_DEV_PXM;
break;
}
status = acpi_get_parent(handle, &handle);
} while (ACPI_SUCCESS(status));
}
#endif /* CONFIG_ACPI */
r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, add);
if (r != -ENOSYS)
return r;
pci_seg_supported = false;
}
if (pci_domain_nr(pci_dev->bus))
r = -ENOSYS;
#ifdef CONFIG_PCI_IOV
else if (pci_dev->is_virtfn) {
struct physdev_manage_pci_ext manage_pci_ext = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn,
.is_virtfn = 1,
.physfn.bus = physfn->bus->number,
.physfn.devfn = physfn->devfn,
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
&manage_pci_ext);
}
#endif
else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
struct physdev_manage_pci_ext manage_pci_ext = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn,
.is_extfn = 1,
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
&manage_pci_ext);
} else {
struct physdev_manage_pci manage_pci = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn,
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
&manage_pci);
}
return r;
}
static int xen_remove_device(struct device *dev)
{
int r;
struct pci_dev *pci_dev = to_pci_dev(dev);
if (pci_seg_supported) {
struct physdev_pci_device device = {
.seg = pci_domain_nr(pci_dev->bus),
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
&device);
} else if (pci_domain_nr(pci_dev->bus))
r = -ENOSYS;
else {
struct physdev_manage_pci manage_pci = {
.bus = pci_dev->bus->number,
.devfn = pci_dev->devfn
};
r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
&manage_pci);
}
return r;
}
static int xen_pci_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
int r = 0;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
r = xen_add_device(dev);
break;
case BUS_NOTIFY_DEL_DEVICE:
r = xen_remove_device(dev);
break;
default:
return NOTIFY_DONE;
}
if (r)
dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
action == BUS_NOTIFY_ADD_DEVICE ? "add" :
(action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
return NOTIFY_OK;
}
static struct notifier_block device_nb = {
.notifier_call = xen_pci_notifier,
};
static int __init register_xen_pci_notifier(void)
{
if (!xen_initial_domain())
return 0;
return bus_register_notifier(&pci_bus_type, &device_nb);
}
arch_initcall(register_xen_pci_notifier);
#ifdef CONFIG_PCI_MMCONFIG
static int __init xen_mcfg_late(void)
{
struct pci_mmcfg_region *cfg;
int rc;
if (!xen_initial_domain())
return 0;
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
return 0;
if (list_empty(&pci_mmcfg_list))
return 0;
/* Check whether they are in the right area. */
list_for_each_entry(cfg, &pci_mmcfg_list, list) {
struct physdev_pci_mmcfg_reserved r;
r.address = cfg->address;
r.segment = cfg->segment;
r.start_bus = cfg->start_bus;
r.end_bus = cfg->end_bus;
r.flags = XEN_PCI_MMCFG_RESERVED;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
switch (rc) {
case 0:
case -ENOSYS:
continue;
default:
pr_warn("Failed to report MMCONFIG reservation"
" state for %s to hypervisor"
" (%d)\n",
cfg->name, rc);
}
}
return 0;
}
/*
* Needs to be done after acpi_init which are subsys_initcall.
*/
subsys_initcall_sync(xen_mcfg_late);
#endif