1 /* 2 * PCI Expander Bridge Device Emulation 3 * 4 * Copyright (C) 2015 Red Hat Inc 5 * 6 * Authors: 7 * Marcel Apfelbaum <marcel@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "hw/pci/pci.h" 16 #include "hw/pci/pci_bus.h" 17 #include "hw/pci/pci_host.h" 18 #include "hw/pci/pci_bridge.h" 19 #include "qemu/range.h" 20 #include "qemu/error-report.h" 21 #include "qemu/module.h" 22 #include "sysemu/numa.h" 23 24 #define TYPE_PXB_BUS "pxb-bus" 25 #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS) 26 27 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus" 28 #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS) 29 30 typedef struct PXBBus { 31 /*< private >*/ 32 PCIBus parent_obj; 33 /*< public >*/ 34 35 char bus_path[8]; 36 } PXBBus; 37 38 #define TYPE_PXB_DEVICE "pxb" 39 #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE) 40 41 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie" 42 #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE) 43 44 typedef struct PXBDev { 45 /*< private >*/ 46 PCIDevice parent_obj; 47 /*< public >*/ 48 49 uint8_t bus_nr; 50 uint16_t numa_node; 51 } PXBDev; 52 53 static PXBDev *convert_to_pxb(PCIDevice *dev) 54 { 55 return pci_bus_is_express(pci_get_bus(dev)) 56 ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); 57 } 58 59 static GList *pxb_dev_list; 60 61 #define TYPE_PXB_HOST "pxb-host" 62 63 static int pxb_bus_num(PCIBus *bus) 64 { 65 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 66 67 return pxb->bus_nr; 68 } 69 70 static uint16_t pxb_bus_numa_node(PCIBus *bus) 71 { 72 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 73 74 return pxb->numa_node; 75 } 76 77 static void pxb_bus_class_init(ObjectClass *class, void *data) 78 { 79 PCIBusClass *pbc = PCI_BUS_CLASS(class); 80 81 pbc->bus_num = pxb_bus_num; 82 pbc->numa_node = pxb_bus_numa_node; 83 } 84 85 static const TypeInfo pxb_bus_info = { 86 .name = TYPE_PXB_BUS, 87 .parent = TYPE_PCI_BUS, 88 .instance_size = sizeof(PXBBus), 89 .class_init = pxb_bus_class_init, 90 }; 91 92 static const TypeInfo pxb_pcie_bus_info = { 93 .name = TYPE_PXB_PCIE_BUS, 94 .parent = TYPE_PCIE_BUS, 95 .instance_size = sizeof(PXBBus), 96 .class_init = pxb_bus_class_init, 97 }; 98 99 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, 100 PCIBus *rootbus) 101 { 102 PXBBus *bus = pci_bus_is_express(rootbus) ? 103 PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); 104 105 snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); 106 return bus->bus_path; 107 } 108 109 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) 110 { 111 const PCIHostState *pxb_host; 112 const PCIBus *pxb_bus; 113 const PXBDev *pxb_dev; 114 int position; 115 const DeviceState *pxb_dev_base; 116 const PCIHostState *main_host; 117 const SysBusDevice *main_host_sbd; 118 119 pxb_host = PCI_HOST_BRIDGE(dev); 120 pxb_bus = pxb_host->bus; 121 pxb_dev = convert_to_pxb(pxb_bus->parent_dev); 122 position = g_list_index(pxb_dev_list, pxb_dev); 123 assert(position >= 0); 124 125 pxb_dev_base = DEVICE(pxb_dev); 126 main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); 127 main_host_sbd = SYS_BUS_DEVICE(main_host); 128 129 if (main_host_sbd->num_mmio > 0) { 130 return g_strdup_printf(TARGET_FMT_plx ",%x", 131 main_host_sbd->mmio[0].addr, position + 1); 132 } 133 if (main_host_sbd->num_pio > 0) { 134 return g_strdup_printf("i%04x,%x", 135 main_host_sbd->pio[0], position + 1); 136 } 137 return NULL; 138 } 139 140 static void pxb_host_class_init(ObjectClass *class, void *data) 141 { 142 DeviceClass *dc = DEVICE_CLASS(class); 143 SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); 144 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); 145 146 dc->fw_name = "pci"; 147 /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ 148 dc->user_creatable = false; 149 sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; 150 hc->root_bus_path = pxb_host_root_bus_path; 151 } 152 153 static const TypeInfo pxb_host_info = { 154 .name = TYPE_PXB_HOST, 155 .parent = TYPE_PCI_HOST_BRIDGE, 156 .class_init = pxb_host_class_init, 157 }; 158 159 /* 160 * Registers the PXB bus as a child of pci host root bus. 161 */ 162 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp) 163 { 164 PCIBus *bus = pci_get_bus(dev); 165 int pxb_bus_num = pci_bus_num(pxb_bus); 166 167 if (bus->parent_dev) { 168 error_setg(errp, "PXB devices can be attached only to root bus"); 169 return; 170 } 171 172 QLIST_FOREACH(bus, &bus->child, sibling) { 173 if (pci_bus_num(bus) == pxb_bus_num) { 174 error_setg(errp, "Bus %d is already in use", pxb_bus_num); 175 return; 176 } 177 } 178 QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling); 179 } 180 181 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) 182 { 183 PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev; 184 185 /* 186 * The bios does not index the pxb slot number when 187 * it computes the IRQ because it resides on bus 0 188 * and not on the current bus. 189 * However QEMU routes the irq through bus 0 and adds 190 * the pxb slot to the IRQ computation of the PXB 191 * device. 192 * 193 * Synchronize between bios and QEMU by canceling 194 * pxb's effect. 195 */ 196 return pin - PCI_SLOT(pxb->devfn); 197 } 198 199 static gint pxb_compare(gconstpointer a, gconstpointer b) 200 { 201 const PXBDev *pxb_a = a, *pxb_b = b; 202 203 return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : 204 pxb_a->bus_nr > pxb_b->bus_nr ? 1 : 205 0; 206 } 207 208 static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp) 209 { 210 PXBDev *pxb = convert_to_pxb(dev); 211 DeviceState *ds, *bds = NULL; 212 PCIBus *bus; 213 const char *dev_name = NULL; 214 Error *local_err = NULL; 215 216 if (pxb->numa_node != NUMA_NODE_UNASSIGNED && 217 pxb->numa_node >= nb_numa_nodes) { 218 error_setg(errp, "Illegal numa node %d", pxb->numa_node); 219 return; 220 } 221 222 if (dev->qdev.id && *dev->qdev.id) { 223 dev_name = dev->qdev.id; 224 } 225 226 ds = qdev_create(NULL, TYPE_PXB_HOST); 227 if (pcie) { 228 bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); 229 } else { 230 bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); 231 bds = qdev_create(BUS(bus), "pci-bridge"); 232 bds->id = dev_name; 233 qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); 234 qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); 235 } 236 237 bus->parent_dev = dev; 238 bus->address_space_mem = pci_get_bus(dev)->address_space_mem; 239 bus->address_space_io = pci_get_bus(dev)->address_space_io; 240 bus->map_irq = pxb_map_irq_fn; 241 242 PCI_HOST_BRIDGE(ds)->bus = bus; 243 244 pxb_register_bus(dev, bus, &local_err); 245 if (local_err) { 246 error_propagate(errp, local_err); 247 goto err_register_bus; 248 } 249 250 qdev_init_nofail(ds); 251 if (bds) { 252 qdev_init_nofail(bds); 253 } 254 255 pci_word_test_and_set_mask(dev->config + PCI_STATUS, 256 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); 257 pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); 258 259 pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); 260 return; 261 262 err_register_bus: 263 object_unref(OBJECT(bds)); 264 object_unparent(OBJECT(bus)); 265 object_unref(OBJECT(ds)); 266 } 267 268 static void pxb_dev_realize(PCIDevice *dev, Error **errp) 269 { 270 if (pci_bus_is_express(pci_get_bus(dev))) { 271 error_setg(errp, "pxb devices cannot reside on a PCIe bus"); 272 return; 273 } 274 275 pxb_dev_realize_common(dev, false, errp); 276 } 277 278 static void pxb_dev_exitfn(PCIDevice *pci_dev) 279 { 280 PXBDev *pxb = convert_to_pxb(pci_dev); 281 282 pxb_dev_list = g_list_remove(pxb_dev_list, pxb); 283 } 284 285 static Property pxb_dev_properties[] = { 286 /* Note: 0 is not a legal PXB bus number. */ 287 DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0), 288 DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED), 289 DEFINE_PROP_END_OF_LIST(), 290 }; 291 292 static void pxb_dev_class_init(ObjectClass *klass, void *data) 293 { 294 DeviceClass *dc = DEVICE_CLASS(klass); 295 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 296 297 k->realize = pxb_dev_realize; 298 k->exit = pxb_dev_exitfn; 299 k->vendor_id = PCI_VENDOR_ID_REDHAT; 300 k->device_id = PCI_DEVICE_ID_REDHAT_PXB; 301 k->class_id = PCI_CLASS_BRIDGE_HOST; 302 303 dc->desc = "PCI Expander Bridge"; 304 dc->props = pxb_dev_properties; 305 dc->hotpluggable = false; 306 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 307 } 308 309 static const TypeInfo pxb_dev_info = { 310 .name = TYPE_PXB_DEVICE, 311 .parent = TYPE_PCI_DEVICE, 312 .instance_size = sizeof(PXBDev), 313 .class_init = pxb_dev_class_init, 314 .interfaces = (InterfaceInfo[]) { 315 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 316 { }, 317 }, 318 }; 319 320 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp) 321 { 322 if (!pci_bus_is_express(pci_get_bus(dev))) { 323 error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus"); 324 return; 325 } 326 327 pxb_dev_realize_common(dev, true, errp); 328 } 329 330 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) 331 { 332 DeviceClass *dc = DEVICE_CLASS(klass); 333 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 334 335 k->realize = pxb_pcie_dev_realize; 336 k->exit = pxb_dev_exitfn; 337 k->vendor_id = PCI_VENDOR_ID_REDHAT; 338 k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; 339 k->class_id = PCI_CLASS_BRIDGE_HOST; 340 341 dc->desc = "PCI Express Expander Bridge"; 342 dc->props = pxb_dev_properties; 343 dc->hotpluggable = false; 344 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 345 } 346 347 static const TypeInfo pxb_pcie_dev_info = { 348 .name = TYPE_PXB_PCIE_DEVICE, 349 .parent = TYPE_PCI_DEVICE, 350 .instance_size = sizeof(PXBDev), 351 .class_init = pxb_pcie_dev_class_init, 352 .interfaces = (InterfaceInfo[]) { 353 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 354 { }, 355 }, 356 }; 357 358 static void pxb_register_types(void) 359 { 360 type_register_static(&pxb_bus_info); 361 type_register_static(&pxb_pcie_bus_info); 362 type_register_static(&pxb_host_info); 363 type_register_static(&pxb_dev_info); 364 type_register_static(&pxb_pcie_dev_info); 365 } 366 367 type_init(pxb_register_types) 368