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 "hw/pci/pci_bridge.h" 23 #include "hw/pci/pci_ids.h" 24 #include "hw/pci/msi.h" 25 #include "hw/pci/shpc.h" 26 #include "hw/pci/slotid_cap.h" 27 #include "exec/memory.h" 28 #include "hw/pci/pci_bus.h" 29 #include "hw/hotplug.h" 30 31 #define TYPE_PCI_BRIDGE_DEV "pci-bridge" 32 #define TYPE_PCI_BRIDGE_SEAT_DEV "pci-bridge-seat" 33 #define PCI_BRIDGE_DEV(obj) \ 34 OBJECT_CHECK(PCIBridgeDev, (obj), TYPE_PCI_BRIDGE_DEV) 35 36 struct PCIBridgeDev { 37 /*< private >*/ 38 PCIBridge parent_obj; 39 /*< public >*/ 40 41 MemoryRegion bar; 42 uint8_t chassis_nr; 43 #define PCI_BRIDGE_DEV_F_MSI_REQ 0 44 uint32_t flags; 45 }; 46 typedef struct PCIBridgeDev PCIBridgeDev; 47 48 static int pci_bridge_dev_initfn(PCIDevice *dev) 49 { 50 PCIBridge *br = PCI_BRIDGE(dev); 51 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 52 int err; 53 54 err = pci_bridge_initfn(dev, TYPE_PCI_BUS); 55 if (err) { 56 goto bridge_error; 57 } 58 dev->config[PCI_INTERRUPT_PIN] = 0x1; 59 memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar", shpc_bar_size(dev)); 60 err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0); 61 if (err) { 62 goto shpc_error; 63 } 64 err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0); 65 if (err) { 66 goto slotid_error; 67 } 68 if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) && 69 msi_supported) { 70 err = msi_init(dev, 0, 1, true, true); 71 if (err < 0) { 72 goto msi_error; 73 } 74 } 75 /* TODO: spec recommends using 64 bit prefetcheable BAR. 76 * Check whether that works well. */ 77 pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | 78 PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar); 79 return 0; 80 msi_error: 81 slotid_cap_cleanup(dev); 82 slotid_error: 83 shpc_cleanup(dev, &bridge_dev->bar); 84 shpc_error: 85 pci_bridge_exitfn(dev); 86 bridge_error: 87 return err; 88 } 89 90 static void pci_bridge_dev_exitfn(PCIDevice *dev) 91 { 92 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 93 if (msi_present(dev)) { 94 msi_uninit(dev); 95 } 96 slotid_cap_cleanup(dev); 97 shpc_cleanup(dev, &bridge_dev->bar); 98 pci_bridge_exitfn(dev); 99 } 100 101 static void pci_bridge_dev_instance_finalize(Object *obj) 102 { 103 shpc_free(PCI_DEVICE(obj)); 104 } 105 106 static void pci_bridge_dev_write_config(PCIDevice *d, 107 uint32_t address, uint32_t val, int len) 108 { 109 pci_bridge_write_config(d, address, val, len); 110 if (msi_present(d)) { 111 msi_write_config(d, address, val, len); 112 } 113 shpc_cap_write_config(d, address, val, len); 114 } 115 116 static void qdev_pci_bridge_dev_reset(DeviceState *qdev) 117 { 118 PCIDevice *dev = PCI_DEVICE(qdev); 119 120 pci_bridge_reset(qdev); 121 shpc_reset(dev); 122 } 123 124 static Property pci_bridge_dev_properties[] = { 125 /* Note: 0 is not a legal chassis number. */ 126 DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0), 127 DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true), 128 DEFINE_PROP_END_OF_LIST(), 129 }; 130 131 static const VMStateDescription pci_bridge_dev_vmstate = { 132 .name = "pci_bridge", 133 .fields = (VMStateField[]) { 134 VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), 135 SHPC_VMSTATE(shpc, PCIDevice), 136 VMSTATE_END_OF_LIST() 137 } 138 }; 139 140 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) 141 { 142 DeviceClass *dc = DEVICE_CLASS(klass); 143 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 144 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 145 146 k->init = pci_bridge_dev_initfn; 147 k->exit = pci_bridge_dev_exitfn; 148 k->config_write = pci_bridge_dev_write_config; 149 k->vendor_id = PCI_VENDOR_ID_REDHAT; 150 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; 151 k->class_id = PCI_CLASS_BRIDGE_PCI; 152 k->is_bridge = 1, 153 dc->desc = "Standard PCI Bridge"; 154 dc->reset = qdev_pci_bridge_dev_reset; 155 dc->props = pci_bridge_dev_properties; 156 dc->vmsd = &pci_bridge_dev_vmstate; 157 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 158 hc->plug = shpc_device_hotplug_cb; 159 hc->unplug_request = shpc_device_hot_unplug_request_cb; 160 } 161 162 static const TypeInfo pci_bridge_dev_info = { 163 .name = TYPE_PCI_BRIDGE_DEV, 164 .parent = TYPE_PCI_BRIDGE, 165 .instance_size = sizeof(PCIBridgeDev), 166 .class_init = pci_bridge_dev_class_init, 167 .instance_finalize = pci_bridge_dev_instance_finalize, 168 .interfaces = (InterfaceInfo[]) { 169 { TYPE_HOTPLUG_HANDLER }, 170 { } 171 } 172 }; 173 174 /* 175 * Multiseat bridge. Same as the standard pci bridge, only with a 176 * different pci id, so we can match it easily in the guest for 177 * automagic multiseat configuration. See docs/multiseat.txt for more. 178 */ 179 static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data) 180 { 181 DeviceClass *dc = DEVICE_CLASS(klass); 182 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 183 184 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT; 185 dc->desc = "Standard PCI Bridge (multiseat)"; 186 } 187 188 static const TypeInfo pci_bridge_dev_seat_info = { 189 .name = TYPE_PCI_BRIDGE_SEAT_DEV, 190 .parent = TYPE_PCI_BRIDGE_DEV, 191 .instance_size = sizeof(PCIBridgeDev), 192 .class_init = pci_bridge_dev_seat_class_init, 193 }; 194 195 static void pci_bridge_dev_register(void) 196 { 197 type_register_static(&pci_bridge_dev_info); 198 type_register_static(&pci_bridge_dev_seat_info); 199 } 200 201 type_init(pci_bridge_dev_register); 202