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 /* additional resources to reserve */ 51 PCIResReserve res_reserve; 52 }; 53 typedef struct PCIBridgeDev PCIBridgeDev; 54 55 static void pci_bridge_dev_realize(PCIDevice *dev, Error **errp) 56 { 57 PCIBridge *br = PCI_BRIDGE(dev); 58 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 59 int err; 60 Error *local_err = NULL; 61 62 pci_bridge_initfn(dev, TYPE_PCI_BUS); 63 64 if (bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_SHPC_REQ)) { 65 dev->config[PCI_INTERRUPT_PIN] = 0x1; 66 memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar", 67 shpc_bar_size(dev)); 68 err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0, errp); 69 if (err) { 70 goto shpc_error; 71 } 72 } else { 73 /* MSI is not applicable without SHPC */ 74 bridge_dev->msi = ON_OFF_AUTO_OFF; 75 } 76 77 err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0, errp); 78 if (err) { 79 goto slotid_error; 80 } 81 82 if (bridge_dev->msi != ON_OFF_AUTO_OFF) { 83 /* it means SHPC exists, because MSI is needed by SHPC */ 84 85 err = msi_init(dev, 0, 1, true, true, &local_err); 86 /* Any error other than -ENOTSUP(board's MSI support is broken) 87 * is a programming error */ 88 assert(!err || err == -ENOTSUP); 89 if (err && bridge_dev->msi == ON_OFF_AUTO_ON) { 90 /* Can't satisfy user's explicit msi=on request, fail */ 91 error_append_hint(&local_err, "You have to use msi=auto (default) " 92 "or msi=off with this machine type.\n"); 93 error_propagate(errp, local_err); 94 goto msi_error; 95 } 96 assert(!local_err || bridge_dev->msi == ON_OFF_AUTO_AUTO); 97 /* With msi=auto, we fall back to MSI off silently */ 98 error_free(local_err); 99 } 100 101 err = pci_bridge_qemu_reserve_cap_init(dev, 0, 102 bridge_dev->res_reserve, errp); 103 if (err) { 104 goto cap_error; 105 } 106 107 if (shpc_present(dev)) { 108 /* TODO: spec recommends using 64 bit prefetcheable BAR. 109 * Check whether that works well. */ 110 pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | 111 PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar); 112 } 113 return; 114 115 cap_error: 116 msi_uninit(dev); 117 msi_error: 118 slotid_cap_cleanup(dev); 119 slotid_error: 120 if (shpc_present(dev)) { 121 shpc_cleanup(dev, &bridge_dev->bar); 122 } 123 shpc_error: 124 pci_bridge_exitfn(dev); 125 } 126 127 static void pci_bridge_dev_exitfn(PCIDevice *dev) 128 { 129 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 130 131 pci_del_capability(dev, PCI_CAP_ID_VNDR, sizeof(PCIBridgeQemuCap)); 132 if (msi_present(dev)) { 133 msi_uninit(dev); 134 } 135 slotid_cap_cleanup(dev); 136 if (shpc_present(dev)) { 137 shpc_cleanup(dev, &bridge_dev->bar); 138 } 139 pci_bridge_exitfn(dev); 140 } 141 142 static void pci_bridge_dev_instance_finalize(Object *obj) 143 { 144 /* this function is idempotent and handles (PCIDevice.shpc == NULL) */ 145 shpc_free(PCI_DEVICE(obj)); 146 } 147 148 static void pci_bridge_dev_write_config(PCIDevice *d, 149 uint32_t address, uint32_t val, int len) 150 { 151 pci_bridge_write_config(d, address, val, len); 152 if (msi_present(d)) { 153 msi_write_config(d, address, val, len); 154 } 155 if (shpc_present(d)) { 156 shpc_cap_write_config(d, address, val, len); 157 } 158 } 159 160 static void qdev_pci_bridge_dev_reset(DeviceState *qdev) 161 { 162 PCIDevice *dev = PCI_DEVICE(qdev); 163 164 pci_bridge_reset(qdev); 165 if (shpc_present(dev)) { 166 shpc_reset(dev); 167 } 168 } 169 170 static Property pci_bridge_dev_properties[] = { 171 /* Note: 0 is not a legal chassis number. */ 172 DEFINE_PROP_UINT8(PCI_BRIDGE_DEV_PROP_CHASSIS_NR, PCIBridgeDev, chassis_nr, 173 0), 174 DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi, 175 ON_OFF_AUTO_AUTO), 176 DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags, 177 PCI_BRIDGE_DEV_F_SHPC_REQ, true), 178 DEFINE_PROP_UINT32("bus-reserve", PCIBridgeDev, 179 res_reserve.bus, -1), 180 DEFINE_PROP_SIZE("io-reserve", PCIBridgeDev, 181 res_reserve.io, -1), 182 DEFINE_PROP_SIZE("mem-reserve", PCIBridgeDev, 183 res_reserve.mem_non_pref, -1), 184 DEFINE_PROP_SIZE("pref32-reserve", PCIBridgeDev, 185 res_reserve.mem_pref_32, -1), 186 DEFINE_PROP_SIZE("pref64-reserve", PCIBridgeDev, 187 res_reserve.mem_pref_64, -1), 188 189 DEFINE_PROP_END_OF_LIST(), 190 }; 191 192 static bool pci_device_shpc_present(void *opaque, int version_id) 193 { 194 PCIDevice *dev = opaque; 195 196 return shpc_present(dev); 197 } 198 199 static const VMStateDescription pci_bridge_dev_vmstate = { 200 .name = "pci_bridge", 201 .priority = MIG_PRI_PCI_BUS, 202 .fields = (VMStateField[]) { 203 VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), 204 SHPC_VMSTATE(shpc, PCIDevice, pci_device_shpc_present), 205 VMSTATE_END_OF_LIST() 206 } 207 }; 208 209 static void pci_bridge_dev_hotplug_cb(HotplugHandler *hotplug_dev, 210 DeviceState *dev, Error **errp) 211 { 212 PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); 213 214 if (!shpc_present(pci_hotplug_dev)) { 215 error_setg(errp, "standard hotplug controller has been disabled for " 216 "this %s", TYPE_PCI_BRIDGE_DEV); 217 return; 218 } 219 shpc_device_hotplug_cb(hotplug_dev, dev, errp); 220 } 221 222 static void pci_bridge_dev_hot_unplug_request_cb(HotplugHandler *hotplug_dev, 223 DeviceState *dev, 224 Error **errp) 225 { 226 PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); 227 228 if (!shpc_present(pci_hotplug_dev)) { 229 error_setg(errp, "standard hotplug controller has been disabled for " 230 "this %s", TYPE_PCI_BRIDGE_DEV); 231 return; 232 } 233 shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp); 234 } 235 236 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) 237 { 238 DeviceClass *dc = DEVICE_CLASS(klass); 239 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 240 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 241 242 k->realize = pci_bridge_dev_realize; 243 k->exit = pci_bridge_dev_exitfn; 244 k->config_write = pci_bridge_dev_write_config; 245 k->vendor_id = PCI_VENDOR_ID_REDHAT; 246 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; 247 k->class_id = PCI_CLASS_BRIDGE_PCI; 248 k->is_bridge = 1, 249 dc->desc = "Standard PCI Bridge"; 250 dc->reset = qdev_pci_bridge_dev_reset; 251 dc->props = pci_bridge_dev_properties; 252 dc->vmsd = &pci_bridge_dev_vmstate; 253 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 254 hc->plug = pci_bridge_dev_hotplug_cb; 255 hc->unplug_request = pci_bridge_dev_hot_unplug_request_cb; 256 } 257 258 static const TypeInfo pci_bridge_dev_info = { 259 .name = TYPE_PCI_BRIDGE_DEV, 260 .parent = TYPE_PCI_BRIDGE, 261 .instance_size = sizeof(PCIBridgeDev), 262 .class_init = pci_bridge_dev_class_init, 263 .instance_finalize = pci_bridge_dev_instance_finalize, 264 .interfaces = (InterfaceInfo[]) { 265 { TYPE_HOTPLUG_HANDLER }, 266 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 267 { } 268 } 269 }; 270 271 /* 272 * Multiseat bridge. Same as the standard pci bridge, only with a 273 * different pci id, so we can match it easily in the guest for 274 * automagic multiseat configuration. See docs/multiseat.txt for more. 275 */ 276 static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data) 277 { 278 DeviceClass *dc = DEVICE_CLASS(klass); 279 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 280 281 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT; 282 dc->desc = "Standard PCI Bridge (multiseat)"; 283 } 284 285 static const TypeInfo pci_bridge_dev_seat_info = { 286 .name = TYPE_PCI_BRIDGE_SEAT_DEV, 287 .parent = TYPE_PCI_BRIDGE_DEV, 288 .instance_size = sizeof(PCIBridgeDev), 289 .class_init = pci_bridge_dev_seat_class_init, 290 }; 291 292 static void pci_bridge_dev_register(void) 293 { 294 type_register_static(&pci_bridge_dev_info); 295 type_register_static(&pci_bridge_dev_seat_info); 296 } 297 298 type_init(pci_bridge_dev_register); 299