hw/pci-bridge/pci_bridge_dev.c

   1 /*
   2  * Standard PCI Bridge Device
   3  *
   4  * Copyright (c) 2011 Red Hat Inc. Author: Michael S. Tsirkin <mst@redhat.com>
   5  *
   6  * http://www.pcisig.com/specifications/conventional/pci_to_pci_bridge_architecture/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "qapi/error.h"
  24 #include "qemu/module.h"
  25 #include "hw/pci/pci_bridge.h"
  26 #include "hw/pci/pci_ids.h"
  27 #include "hw/pci/msi.h"
  28 #include "hw/pci/shpc.h"
  29 #include "hw/pci/slotid_cap.h"
  30 #include "hw/qdev-properties.h"
  31 #include "exec/memory.h"
  32 #include "hw/pci/pci_bus.h"
  33 #include "hw/hotplug.h"
  34 #include "qom/object.h"
  35
  36 #define TYPE_PCI_BRIDGE_DEV      "pci-bridge"
  37 #define TYPE_PCI_BRIDGE_SEAT_DEV "pci-bridge-seat"
  38 OBJECT_DECLARE_SIMPLE_TYPE(PCIBridgeDev, PCI_BRIDGE_DEV)
  39
  40 struct PCIBridgeDev {
  41     /*< private >*/
  42     PCIBridge parent_obj;
  43     /*< public >*/
  44
  45     MemoryRegion bar;
  46     uint8_t chassis_nr;
  47 #define PCI_BRIDGE_DEV_F_SHPC_REQ 0
  48     uint32_t flags;
  49
  50     OnOffAuto msi;
  51
  52     /* additional resources to reserve */
  53     PCIResReserve res_reserve;
  54 };
  55
  56 static void pci_bridge_dev_realize(PCIDevice *dev, Error **errp)
  57 {
  58     PCIBridge *br = PCI_BRIDGE(dev);
  59     PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev);
  60     int err;
  61     Error *local_err = NULL;
  62
  63     pci_bridge_initfn(dev, TYPE_PCI_BUS);
  64
  65     if (bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_SHPC_REQ)) {
  66         dev->config[PCI_INTERRUPT_PIN] = 0x1;
  67         memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar",
  68                            shpc_bar_size(dev));
  69         err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0, errp);
  70         if (err) {
  71             goto shpc_error;
  72         }
  73     } else {
  74         /* MSI is not applicable without SHPC */
  75         bridge_dev->msi = ON_OFF_AUTO_OFF;
  76     }
  77
  78     err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0, errp);
  79     if (err) {
  80         goto slotid_error;
  81     }
  82
  83     if (bridge_dev->msi != ON_OFF_AUTO_OFF) {
  84         /* it means SHPC exists, because MSI is needed by SHPC */
  85
  86         err = msi_init(dev, 0, 1, true, true, &local_err);
  87         /* Any error other than -ENOTSUP(board's MSI support is broken)
  88          * is a programming error */
  89         assert(!err || err == -ENOTSUP);
  90         if (err && bridge_dev->msi == ON_OFF_AUTO_ON) {
  91             /* Can't satisfy user's explicit msi=on request, fail */
  92             error_append_hint(&local_err, "You have to use msi=auto (default) "
  93                     "or msi=off with this machine type.\n");
  94             error_propagate(errp, local_err);
  95             goto msi_error;
  96         }
  97         assert(!local_err || bridge_dev->msi == ON_OFF_AUTO_AUTO);
  98         /* With msi=auto, we fall back to MSI off silently */
  99         error_free(local_err);
 100     }
 101
 102     err = pci_bridge_qemu_reserve_cap_init(dev, 0,
 103                                          bridge_dev->res_reserve, errp);
 104     if (err) {
 105         goto cap_error;
 106     }
 107
 108     if (shpc_present(dev)) {
 109         /* TODO: spec recommends using 64 bit prefetcheable BAR.
 110          * Check whether that works well. */
 111         pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
 112                          PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
 113     }
 114     return;
 115
 116 cap_error:
 117     msi_uninit(dev);
 118 msi_error:
 119     slotid_cap_cleanup(dev);
 120 slotid_error:
 121     if (shpc_present(dev)) {
 122         shpc_cleanup(dev, &bridge_dev->bar);
 123     }
 124 shpc_error:
 125     pci_bridge_exitfn(dev);
 126 }
 127
 128 static void pci_bridge_dev_exitfn(PCIDevice *dev)
 129 {
 130     PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev);
 131
 132     pci_del_capability(dev, PCI_CAP_ID_VNDR, sizeof(PCIBridgeQemuCap));
 133     if (msi_present(dev)) {
 134         msi_uninit(dev);
 135     }
 136     slotid_cap_cleanup(dev);
 137     if (shpc_present(dev)) {
 138         shpc_cleanup(dev, &bridge_dev->bar);
 139     }
 140     pci_bridge_exitfn(dev);
 141 }
 142
 143 static void pci_bridge_dev_instance_finalize(Object *obj)
 144 {
 145     /* this function is idempotent and handles (PCIDevice.shpc == NULL) */
 146     shpc_free(PCI_DEVICE(obj));
 147 }
 148
 149 static void pci_bridge_dev_write_config(PCIDevice *d,
 150                                         uint32_t address, uint32_t val, int len)
 151 {
 152     pci_bridge_write_config(d, address, val, len);
 153     if (msi_present(d)) {
 154         msi_write_config(d, address, val, len);
 155     }
 156     if (shpc_present(d)) {
 157         shpc_cap_write_config(d, address, val, len);
 158     }
 159 }
 160
 161 static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
 162 {
 163     PCIDevice *dev = PCI_DEVICE(qdev);
 164
 165     pci_bridge_reset(qdev);
 166     if (shpc_present(dev)) {
 167         shpc_reset(dev);
 168     }
 169 }
 170
 171 static Property pci_bridge_dev_properties[] = {
 172                     /* Note: 0 is not a legal chassis number. */
 173     DEFINE_PROP_UINT8(PCI_BRIDGE_DEV_PROP_CHASSIS_NR, PCIBridgeDev, chassis_nr,
 174                       0),
 175     DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi,
 176                             ON_OFF_AUTO_AUTO),
 177     DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags,
 178                     PCI_BRIDGE_DEV_F_SHPC_REQ, true),
 179     DEFINE_PROP_UINT32("bus-reserve", PCIBridgeDev,
 180                        res_reserve.bus, -1),
 181     DEFINE_PROP_SIZE("io-reserve", PCIBridgeDev,
 182                      res_reserve.io, -1),
 183     DEFINE_PROP_SIZE("mem-reserve", PCIBridgeDev,
 184                      res_reserve.mem_non_pref, -1),
 185     DEFINE_PROP_SIZE("pref32-reserve", PCIBridgeDev,
 186                      res_reserve.mem_pref_32, -1),
 187     DEFINE_PROP_SIZE("pref64-reserve", PCIBridgeDev,
 188                      res_reserve.mem_pref_64, -1),
 189
 190     DEFINE_PROP_END_OF_LIST(),
 191 };
 192
 193 static bool pci_device_shpc_present(void *opaque, int version_id)
 194 {
 195     PCIDevice *dev = opaque;
 196
 197     return shpc_present(dev);
 198 }
 199
 200 static const VMStateDescription pci_bridge_dev_vmstate = {
 201     .name = "pci_bridge",
 202     .priority = MIG_PRI_PCI_BUS,
 203     .fields = (VMStateField[]) {
 204         VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
 205         SHPC_VMSTATE(shpc, PCIDevice, pci_device_shpc_present),
 206         VMSTATE_END_OF_LIST()
 207     }
 208 };
 209
 210 void pci_bridge_dev_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
 211                             Error **errp)
 212 {
 213     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 214
 215     if (!shpc_present(pci_hotplug_dev)) {
 216         error_setg(errp, "standard hotplug controller has been disabled for "
 217                    "this %s", object_get_typename(OBJECT(hotplug_dev)));
 218         return;
 219     }
 220     shpc_device_plug_cb(hotplug_dev, dev, errp);
 221 }
 222
 223 void pci_bridge_dev_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
 224                               Error **errp)
 225 {
 226     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 227
 228     g_assert(shpc_present(pci_hotplug_dev));
 229     shpc_device_unplug_cb(hotplug_dev, dev, errp);
 230 }
 231
 232 void pci_bridge_dev_unplug_request_cb(HotplugHandler *hotplug_dev,
 233                                       DeviceState *dev, Error **errp)
 234 {
 235     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 236
 237     if (!shpc_present(pci_hotplug_dev)) {
 238         error_setg(errp, "standard hotplug controller has been disabled for "
 239                    "this %s", object_get_typename(OBJECT(hotplug_dev)));
 240         return;
 241     }
 242     shpc_device_unplug_request_cb(hotplug_dev, dev, errp);
 243 }
 244
 245 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
 246 {
 247     DeviceClass *dc = DEVICE_CLASS(klass);
 248     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 249     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
 250
 251     k->realize = pci_bridge_dev_realize;
 252     k->exit = pci_bridge_dev_exitfn;
 253     k->config_write = pci_bridge_dev_write_config;
 254     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 255     k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE;
 256     k->class_id = PCI_CLASS_BRIDGE_PCI;
 257     k->is_bridge = true;
 258     dc->desc = "Standard PCI Bridge";
 259     dc->reset = qdev_pci_bridge_dev_reset;
 260     device_class_set_props(dc, pci_bridge_dev_properties);
 261     dc->vmsd = &pci_bridge_dev_vmstate;
 262     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 263     hc->plug = pci_bridge_dev_plug_cb;
 264     hc->unplug = pci_bridge_dev_unplug_cb;
 265     hc->unplug_request = pci_bridge_dev_unplug_request_cb;
 266 }
 267
 268 static const TypeInfo pci_bridge_dev_info = {
 269     .name              = TYPE_PCI_BRIDGE_DEV,
 270     .parent            = TYPE_PCI_BRIDGE,
 271     .instance_size     = sizeof(PCIBridgeDev),
 272     .class_init        = pci_bridge_dev_class_init,
 273     .instance_finalize = pci_bridge_dev_instance_finalize,
 274     .interfaces = (InterfaceInfo[]) {
 275         { TYPE_HOTPLUG_HANDLER },
 276         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 277         { }
 278     }
 279 };
 280
 281 /*
 282  * Multiseat bridge.  Same as the standard pci bridge, only with a
 283  * different pci id, so we can match it easily in the guest for
 284  * automagic multiseat configuration.  See docs/multiseat.txt for more.
 285  */
 286 static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data)
 287 {
 288     DeviceClass *dc = DEVICE_CLASS(klass);
 289     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 290
 291     k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT;
 292     dc->desc = "Standard PCI Bridge (multiseat)";
 293 }
 294
 295 static const TypeInfo pci_bridge_dev_seat_info = {
 296     .name              = TYPE_PCI_BRIDGE_SEAT_DEV,
 297     .parent            = TYPE_PCI_BRIDGE_DEV,
 298     .instance_size     = sizeof(PCIBridgeDev),
 299     .class_init        = pci_bridge_dev_seat_class_init,
 300 };
 301
 302 static void pci_bridge_dev_register(void)
 303 {
 304     type_register_static(&pci_bridge_dev_info);
 305     type_register_static(&pci_bridge_dev_seat_info);
 306 }
 307
 308 type_init(pci_bridge_dev_register);