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 int pci_bridge_dev_initfn(PCIDevice *dev) 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); 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); 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_report_err(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 0; 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 return err; 116 } 117 118 static void pci_bridge_dev_exitfn(PCIDevice *dev) 119 { 120 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 121 if (msi_present(dev)) { 122 msi_uninit(dev); 123 } 124 slotid_cap_cleanup(dev); 125 if (shpc_present(dev)) { 126 shpc_cleanup(dev, &bridge_dev->bar); 127 } 128 pci_bridge_exitfn(dev); 129 } 130 131 static void pci_bridge_dev_instance_finalize(Object *obj) 132 { 133 /* this function is idempotent and handles (PCIDevice.shpc == NULL) */ 134 shpc_free(PCI_DEVICE(obj)); 135 } 136 137 static void pci_bridge_dev_write_config(PCIDevice *d, 138 uint32_t address, uint32_t val, int len) 139 { 140 pci_bridge_write_config(d, address, val, len); 141 if (msi_present(d)) { 142 msi_write_config(d, address, val, len); 143 } 144 if (shpc_present(d)) { 145 shpc_cap_write_config(d, address, val, len); 146 } 147 } 148 149 static void qdev_pci_bridge_dev_reset(DeviceState *qdev) 150 { 151 PCIDevice *dev = PCI_DEVICE(qdev); 152 153 pci_bridge_reset(qdev); 154 if (shpc_present(dev)) { 155 shpc_reset(dev); 156 } 157 } 158 159 static Property pci_bridge_dev_properties[] = { 160 /* Note: 0 is not a legal chassis number. */ 161 DEFINE_PROP_UINT8(PCI_BRIDGE_DEV_PROP_CHASSIS_NR, PCIBridgeDev, chassis_nr, 162 0), 163 DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi, 164 ON_OFF_AUTO_AUTO), 165 DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags, 166 PCI_BRIDGE_DEV_F_SHPC_REQ, true), 167 DEFINE_PROP_END_OF_LIST(), 168 }; 169 170 static bool pci_device_shpc_present(void *opaque, int version_id) 171 { 172 PCIDevice *dev = opaque; 173 174 return shpc_present(dev); 175 } 176 177 static const VMStateDescription pci_bridge_dev_vmstate = { 178 .name = "pci_bridge", 179 .fields = (VMStateField[]) { 180 VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), 181 SHPC_VMSTATE(shpc, PCIDevice, pci_device_shpc_present), 182 VMSTATE_END_OF_LIST() 183 } 184 }; 185 186 static void pci_bridge_dev_hotplug_cb(HotplugHandler *hotplug_dev, 187 DeviceState *dev, Error **errp) 188 { 189 PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); 190 191 if (!shpc_present(pci_hotplug_dev)) { 192 error_setg(errp, "standard hotplug controller has been disabled for " 193 "this %s", TYPE_PCI_BRIDGE_DEV); 194 return; 195 } 196 shpc_device_hotplug_cb(hotplug_dev, dev, errp); 197 } 198 199 static void pci_bridge_dev_hot_unplug_request_cb(HotplugHandler *hotplug_dev, 200 DeviceState *dev, 201 Error **errp) 202 { 203 PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); 204 205 if (!shpc_present(pci_hotplug_dev)) { 206 error_setg(errp, "standard hotplug controller has been disabled for " 207 "this %s", TYPE_PCI_BRIDGE_DEV); 208 return; 209 } 210 shpc_device_hot_unplug_request_cb(hotplug_dev, dev, errp); 211 } 212 213 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) 214 { 215 DeviceClass *dc = DEVICE_CLASS(klass); 216 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 217 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 218 219 k->init = pci_bridge_dev_initfn; 220 k->exit = pci_bridge_dev_exitfn; 221 k->config_write = pci_bridge_dev_write_config; 222 k->vendor_id = PCI_VENDOR_ID_REDHAT; 223 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; 224 k->class_id = PCI_CLASS_BRIDGE_PCI; 225 k->is_bridge = 1, 226 dc->desc = "Standard PCI Bridge"; 227 dc->reset = qdev_pci_bridge_dev_reset; 228 dc->props = pci_bridge_dev_properties; 229 dc->vmsd = &pci_bridge_dev_vmstate; 230 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 231 hc->plug = pci_bridge_dev_hotplug_cb; 232 hc->unplug_request = pci_bridge_dev_hot_unplug_request_cb; 233 } 234 235 static const TypeInfo pci_bridge_dev_info = { 236 .name = TYPE_PCI_BRIDGE_DEV, 237 .parent = TYPE_PCI_BRIDGE, 238 .instance_size = sizeof(PCIBridgeDev), 239 .class_init = pci_bridge_dev_class_init, 240 .instance_finalize = pci_bridge_dev_instance_finalize, 241 .interfaces = (InterfaceInfo[]) { 242 { TYPE_HOTPLUG_HANDLER }, 243 { } 244 } 245 }; 246 247 /* 248 * Multiseat bridge. Same as the standard pci bridge, only with a 249 * different pci id, so we can match it easily in the guest for 250 * automagic multiseat configuration. See docs/multiseat.txt for more. 251 */ 252 static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data) 253 { 254 DeviceClass *dc = DEVICE_CLASS(klass); 255 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 256 257 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT; 258 dc->desc = "Standard PCI Bridge (multiseat)"; 259 } 260 261 static const TypeInfo pci_bridge_dev_seat_info = { 262 .name = TYPE_PCI_BRIDGE_SEAT_DEV, 263 .parent = TYPE_PCI_BRIDGE_DEV, 264 .instance_size = sizeof(PCIBridgeDev), 265 .class_init = pci_bridge_dev_seat_class_init, 266 }; 267 268 static void pci_bridge_dev_register(void) 269 { 270 type_register_static(&pci_bridge_dev_info); 271 type_register_static(&pci_bridge_dev_seat_info); 272 } 273 274 type_init(pci_bridge_dev_register); 275