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 "hw/pci/pci_bridge.h"
  25 #include "hw/pci/pci_ids.h"
  26 #include "hw/pci/msi.h"
  27 #include "hw/pci/shpc.h"
  28 #include "hw/pci/slotid_cap.h"
  29 #include "exec/memory.h"
  30 #include "hw/pci/pci_bus.h"
  31 #include "hw/hotplug.h"
  32
  33 #define TYPE_PCI_BRIDGE_DEV      "pci-bridge"
  34 #define TYPE_PCI_BRIDGE_SEAT_DEV "pci-bridge-seat"
  35 #define PCI_BRIDGE_DEV(obj) \
  36     OBJECT_CHECK(PCIBridgeDev, (obj), TYPE_PCI_BRIDGE_DEV)
  37
  38 struct PCIBridgeDev {
  39     /*< private >*/
  40     PCIBridge parent_obj;
  41     /*< public >*/
  42
  43     MemoryRegion bar;
  44     uint8_t chassis_nr;
  45 #define PCI_BRIDGE_DEV_F_SHPC_REQ 0
  46     uint32_t flags;
  47
  48     OnOffAuto msi;
  49 };
  50 typedef struct PCIBridgeDev PCIBridgeDev;
  51
  52 static void pci_bridge_dev_realize(PCIDevice *dev, Error **errp)
  53 {
  54     PCIBridge *br = PCI_BRIDGE(dev);
  55     PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev);
  56     int err;
  57     Error *local_err = NULL;
  58
  59     pci_bridge_initfn(dev, TYPE_PCI_BUS);
  60
  61     if (bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_SHPC_REQ)) {
  62         dev->config[PCI_INTERRUPT_PIN] = 0x1;
  63         memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar",
  64                            shpc_bar_size(dev));
  65         err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0, errp);
  66         if (err) {
  67             goto shpc_error;
  68         }
  69     } else {
  70         /* MSI is not applicable without SHPC */
  71         bridge_dev->msi = ON_OFF_AUTO_OFF;
  72     }
  73
  74     err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0, errp);
  75     if (err) {
  76         goto slotid_error;
  77     }
  78
  79     if (bridge_dev->msi != ON_OFF_AUTO_OFF) {
  80         /* it means SHPC exists, because MSI is needed by SHPC */
  81
  82         err = msi_init(dev, 0, 1, true, true, &local_err);
  83         /* Any error other than -ENOTSUP(board's MSI support is broken)
  84          * is a programming error */
  85         assert(!err || err == -ENOTSUP);
  86         if (err && bridge_dev->msi == ON_OFF_AUTO_ON) {
  87             /* Can't satisfy user's explicit msi=on request, fail */
  88             error_append_hint(&local_err, "You have to use msi=auto (default) "
  89                     "or msi=off with this machine type.\n");
  90             error_propagate(errp, local_err);
  91             goto msi_error;
  92         }
  93         assert(!local_err || bridge_dev->msi == ON_OFF_AUTO_AUTO);
  94         /* With msi=auto, we fall back to MSI off silently */
  95         error_free(local_err);
  96     }
  97
  98     if (shpc_present(dev)) {
  99         /* TODO: spec recommends using 64 bit prefetcheable BAR.
 100          * Check whether that works well. */
 101         pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
 102                          PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
 103     }
 104     return;
 105
 106 msi_error:
 107     slotid_cap_cleanup(dev);
 108 slotid_error:
 109     if (shpc_present(dev)) {
 110         shpc_cleanup(dev, &bridge_dev->bar);
 111     }
 112 shpc_error:
 113     pci_bridge_exitfn(dev);
 114 }
 115
 116 static void pci_bridge_dev_exitfn(PCIDevice *dev)
 117 {
 118     PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev);
 119     if (msi_present(dev)) {
 120         msi_uninit(dev);
 121     }
 122     slotid_cap_cleanup(dev);
 123     if (shpc_present(dev)) {
 124         shpc_cleanup(dev, &bridge_dev->bar);
 125     }
 126     pci_bridge_exitfn(dev);
 127 }
 128
 129 static void pci_bridge_dev_instance_finalize(Object *obj)
 130 {
 131     /* this function is idempotent and handles (PCIDevice.shpc == NULL) */
 132     shpc_free(PCI_DEVICE(obj));
 133 }
 134
 135 static void pci_bridge_dev_write_config(PCIDevice *d,
 136                                         uint32_t address, uint32_t val, int len)
 137 {
 138     pci_bridge_write_config(d, address, val, len);
 139     if (msi_present(d)) {
 140         msi_write_config(d, address, val, len);
 141     }
 142     if (shpc_present(d)) {
 143         shpc_cap_write_config(d, address, val, len);
 144     }
 145 }
 146
 147 static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
 148 {
 149     PCIDevice *dev = PCI_DEVICE(qdev);
 150
 151     pci_bridge_reset(qdev);
 152     if (shpc_present(dev)) {
 153         shpc_reset(dev);
 154     }
 155 }
 156
 157 static Property pci_bridge_dev_properties[] = {
 158                     /* Note: 0 is not a legal chassis number. */
 159     DEFINE_PROP_UINT8(PCI_BRIDGE_DEV_PROP_CHASSIS_NR, PCIBridgeDev, chassis_nr,
 160                       0),
 161     DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi,
 162                             ON_OFF_AUTO_AUTO),
 163     DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags,
 164                     PCI_BRIDGE_DEV_F_SHPC_REQ, true),
 165     DEFINE_PROP_END_OF_LIST(),
 166 };
 167
 168 static bool pci_device_shpc_present(void *opaque, int version_id)
 169 {
 170     PCIDevice *dev = opaque;
 171
 172     return shpc_present(dev);
 173 }
 174
 175 static const VMStateDescription pci_bridge_dev_vmstate = {
 176     .name = "pci_bridge",
 177     .fields = (VMStateField[]) {
 178         VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
 179         SHPC_VMSTATE(shpc, PCIDevice, pci_device_shpc_present),
 180         VMSTATE_END_OF_LIST()
 181     }
 182 };
 183
 184 static void pci_bridge_dev_hotplug_cb(HotplugHandler *hotplug_dev,
 185                                       DeviceState *dev, Error **errp)
 186 {
 187     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 188
 189     if (!shpc_present(pci_hotplug_dev)) {
 190         error_setg(errp, "standard hotplug controller has been disabled for "
 191                    "this %s", TYPE_PCI_BRIDGE_DEV);
 192         return;
 193     }
 194     shpc_device_hotplug_cb(hotplug_dev, dev, errp);
 195 }
 196
 197 static void pci_bridge_dev_hot_unplug_request_cb(HotplugHandler *hotplug_dev,
 198                                                  DeviceState *dev,
 199                                                  Error **errp)
 200 {
 201     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 202
 203     if (!shpc_present(pci_hotplug_dev)) {
 204         error_setg(errp, "standard hotplug controller has been disabled for "
 205                    "this %s", TYPE_PCI_BRIDGE_DEV);
 206         return;
 207     }
 208     shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp);
 209 }
 210
 211 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
 212 {
 213     DeviceClass *dc = DEVICE_CLASS(klass);
 214     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 215     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
 216
 217     k->realize = pci_bridge_dev_realize;
 218     k->exit = pci_bridge_dev_exitfn;
 219     k->config_write = pci_bridge_dev_write_config;
 220     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 221     k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE;
 222     k->class_id = PCI_CLASS_BRIDGE_PCI;
 223     k->is_bridge = 1,
 224     dc->desc = "Standard PCI Bridge";
 225     dc->reset = qdev_pci_bridge_dev_reset;
 226     dc->props = pci_bridge_dev_properties;
 227     dc->vmsd = &pci_bridge_dev_vmstate;
 228     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 229     hc->plug = pci_bridge_dev_hotplug_cb;
 230     hc->unplug_request = pci_bridge_dev_hot_unplug_request_cb;
 231 }
 232
 233 static const TypeInfo pci_bridge_dev_info = {
 234     .name              = TYPE_PCI_BRIDGE_DEV,
 235     .parent            = TYPE_PCI_BRIDGE,
 236     .instance_size     = sizeof(PCIBridgeDev),
 237     .class_init        = pci_bridge_dev_class_init,
 238     .instance_finalize = pci_bridge_dev_instance_finalize,
 239     .interfaces = (InterfaceInfo[]) {
 240         { TYPE_HOTPLUG_HANDLER },
 241         { }
 242     }
 243 };
 244
 245 /*
 246  * Multiseat bridge.  Same as the standard pci bridge, only with a
 247  * different pci id, so we can match it easily in the guest for
 248  * automagic multiseat configuration.  See docs/multiseat.txt for more.
 249  */
 250 static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data)
 251 {
 252     DeviceClass *dc = DEVICE_CLASS(klass);
 253     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 254
 255     k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT;
 256     dc->desc = "Standard PCI Bridge (multiseat)";
 257 }
 258
 259 static const TypeInfo pci_bridge_dev_seat_info = {
 260     .name              = TYPE_PCI_BRIDGE_SEAT_DEV,
 261     .parent            = TYPE_PCI_BRIDGE_DEV,
 262     .instance_size     = sizeof(PCIBridgeDev),
 263     .class_init        = pci_bridge_dev_seat_class_init,
 264 };
 265
 266 static void pci_bridge_dev_register(void)
 267 {
 268     type_register_static(&pci_bridge_dev_info);
 269     type_register_static(&pci_bridge_dev_seat_info);
 270 }
 271
 272 type_init(pci_bridge_dev_register);