drivers/xen/pci.c

   1 /*
   2  * Copyright (c) 2009, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Author: Weidong Han <weidong.han@intel.com>
  18  */
  19
  20 #include <linux/pci.h>
  21 #include <linux/acpi.h>
  22 #include <xen/xen.h>
  23 #include <xen/interface/physdev.h>
  24 #include <xen/interface/xen.h>
  25
  26 #include <asm/xen/hypervisor.h>
  27 #include <asm/xen/hypercall.h>
  28 #include "../pci/pci.h"
  29 #include <asm/pci_x86.h>
  30
  31 static bool __read_mostly pci_seg_supported = true;
  32
  33 static int xen_add_device(struct device *dev)
  34 {
  35         int r;
  36         struct pci_dev *pci_dev = to_pci_dev(dev);
  37 #ifdef CONFIG_PCI_IOV
  38         struct pci_dev *physfn = pci_dev->physfn;
  39 #endif
  40
  41         if (pci_seg_supported) {
  42                 struct physdev_pci_device_add add = {
  43                         .seg = pci_domain_nr(pci_dev->bus),
  44                         .bus = pci_dev->bus->number,
  45                         .devfn = pci_dev->devfn
  46                 };
  47 #ifdef CONFIG_ACPI
  48                 acpi_handle handle;
  49 #endif
  50
  51 #ifdef CONFIG_PCI_IOV
  52                 if (pci_dev->is_virtfn) {
  53                         add.flags = XEN_PCI_DEV_VIRTFN;
  54                         add.physfn.bus = physfn->bus->number;
  55                         add.physfn.devfn = physfn->devfn;
  56                 } else
  57 #endif
  58                 if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn))
  59                         add.flags = XEN_PCI_DEV_EXTFN;
  60
  61 #ifdef CONFIG_ACPI
  62                 handle = ACPI_HANDLE(&pci_dev->dev);
  63                 if (!handle && pci_dev->bus->bridge)
  64                         handle = ACPI_HANDLE(pci_dev->bus->bridge);
  65 #ifdef CONFIG_PCI_IOV
  66                 if (!handle && pci_dev->is_virtfn)
  67                         handle = ACPI_HANDLE(physfn->bus->bridge);
  68 #endif
  69                 if (handle) {
  70                         acpi_status status;
  71
  72                         do {
  73                                 unsigned long long pxm;
  74
  75                                 status = acpi_evaluate_integer(handle, "_PXM",
  76                                                                NULL, &pxm);
  77                                 if (ACPI_SUCCESS(status)) {
  78                                         add.optarr[0] = pxm;
  79                                         add.flags |= XEN_PCI_DEV_PXM;
  80                                         break;
  81                                 }
  82                                 status = acpi_get_parent(handle, &handle);
  83                         } while (ACPI_SUCCESS(status));
  84                 }
  85 #endif /* CONFIG_ACPI */
  86
  87                 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add);
  88                 if (r != -ENOSYS)
  89                         return r;
  90                 pci_seg_supported = false;
  91         }
  92
  93         if (pci_domain_nr(pci_dev->bus))
  94                 r = -ENOSYS;
  95 #ifdef CONFIG_PCI_IOV
  96         else if (pci_dev->is_virtfn) {
  97                 struct physdev_manage_pci_ext manage_pci_ext = {
  98                         .bus            = pci_dev->bus->number,
  99                         .devfn          = pci_dev->devfn,
 100                         .is_virtfn      = 1,
 101                         .physfn.bus     = physfn->bus->number,
 102                         .physfn.devfn   = physfn->devfn,
 103                 };
 104
 105                 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
 106                         &manage_pci_ext);
 107         }
 108 #endif
 109         else if (pci_ari_enabled(pci_dev->bus) && PCI_SLOT(pci_dev->devfn)) {
 110                 struct physdev_manage_pci_ext manage_pci_ext = {
 111                         .bus            = pci_dev->bus->number,
 112                         .devfn          = pci_dev->devfn,
 113                         .is_extfn       = 1,
 114                 };
 115
 116                 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add_ext,
 117                         &manage_pci_ext);
 118         } else {
 119                 struct physdev_manage_pci manage_pci = {
 120                         .bus    = pci_dev->bus->number,
 121                         .devfn  = pci_dev->devfn,
 122                 };
 123
 124                 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_add,
 125                         &manage_pci);
 126         }
 127
 128         return r;
 129 }
 130
 131 static int xen_remove_device(struct device *dev)
 132 {
 133         int r;
 134         struct pci_dev *pci_dev = to_pci_dev(dev);
 135
 136         if (pci_seg_supported) {
 137                 struct physdev_pci_device device = {
 138                         .seg = pci_domain_nr(pci_dev->bus),
 139                         .bus = pci_dev->bus->number,
 140                         .devfn = pci_dev->devfn
 141                 };
 142
 143                 r = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_remove,
 144                                           &device);
 145         } else if (pci_domain_nr(pci_dev->bus))
 146                 r = -ENOSYS;
 147         else {
 148                 struct physdev_manage_pci manage_pci = {
 149                         .bus = pci_dev->bus->number,
 150                         .devfn = pci_dev->devfn
 151                 };
 152
 153                 r = HYPERVISOR_physdev_op(PHYSDEVOP_manage_pci_remove,
 154                                           &manage_pci);
 155         }
 156
 157         return r;
 158 }
 159
 160 static int xen_pci_notifier(struct notifier_block *nb,
 161                             unsigned long action, void *data)
 162 {
 163         struct device *dev = data;
 164         int r = 0;
 165
 166         switch (action) {
 167         case BUS_NOTIFY_ADD_DEVICE:
 168                 r = xen_add_device(dev);
 169                 break;
 170         case BUS_NOTIFY_DEL_DEVICE:
 171                 r = xen_remove_device(dev);
 172                 break;
 173         default:
 174                 return NOTIFY_DONE;
 175         }
 176         if (r)
 177                 dev_err(dev, "Failed to %s - passthrough or MSI/MSI-X might fail!\n",
 178                         action == BUS_NOTIFY_ADD_DEVICE ? "add" :
 179                         (action == BUS_NOTIFY_DEL_DEVICE ? "delete" : "?"));
 180         return NOTIFY_OK;
 181 }
 182
 183 static struct notifier_block device_nb = {
 184         .notifier_call = xen_pci_notifier,
 185 };
 186
 187 static int __init register_xen_pci_notifier(void)
 188 {
 189         if (!xen_initial_domain())
 190                 return 0;
 191
 192         return bus_register_notifier(&pci_bus_type, &device_nb);
 193 }
 194
 195 arch_initcall(register_xen_pci_notifier);
 196
 197 #ifdef CONFIG_PCI_MMCONFIG
 198 static int __init xen_mcfg_late(void)
 199 {
 200         struct pci_mmcfg_region *cfg;
 201         int rc;
 202
 203         if (!xen_initial_domain())
 204                 return 0;
 205
 206         if ((pci_probe & PCI_PROBE_MMCONF) == 0)
 207                 return 0;
 208
 209         if (list_empty(&pci_mmcfg_list))
 210                 return 0;
 211
 212         /* Check whether they are in the right area. */
 213         list_for_each_entry(cfg, &pci_mmcfg_list, list) {
 214                 struct physdev_pci_mmcfg_reserved r;
 215
 216                 r.address = cfg->address;
 217                 r.segment = cfg->segment;
 218                 r.start_bus = cfg->start_bus;
 219                 r.end_bus = cfg->end_bus;
 220                 r.flags = XEN_PCI_MMCFG_RESERVED;
 221
 222                 rc = HYPERVISOR_physdev_op(PHYSDEVOP_pci_mmcfg_reserved, &r);
 223                 switch (rc) {
 224                 case 0:
 225                 case -ENOSYS:
 226                         continue;
 227
 228                 default:
 229                         pr_warn("Failed to report MMCONFIG reservation"
 230                                 " state for %s to hypervisor"
 231                                 " (%d)\n",
 232                                 cfg->name, rc);
 233                 }
 234         }
 235         return 0;
 236 }
 237 /*
 238  * Needs to be done after acpi_init which are subsys_initcall.
 239  */
 240 subsys_initcall_sync(xen_mcfg_late);
 241 #endif