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/qdev-properties.h" 19 #include "hw/pci/pci_bridge.h" 20 #include "qemu/range.h" 21 #include "qemu/error-report.h" 22 #include "qemu/module.h" 23 #include "sysemu/numa.h" 24 25 #define TYPE_PXB_BUS "pxb-bus" 26 #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS) 27 28 #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus" 29 #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS) 30 31 typedef struct PXBBus { 32 /*< private >*/ 33 PCIBus parent_obj; 34 /*< public >*/ 35 36 char bus_path[8]; 37 } PXBBus; 38 39 #define TYPE_PXB_DEVICE "pxb" 40 #define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE) 41 42 #define TYPE_PXB_PCIE_DEVICE "pxb-pcie" 43 #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE) 44 45 typedef struct PXBDev { 46 /*< private >*/ 47 PCIDevice parent_obj; 48 /*< public >*/ 49 50 uint8_t bus_nr; 51 uint16_t numa_node; 52 } PXBDev; 53 54 static PXBDev *convert_to_pxb(PCIDevice *dev) 55 { 56 return pci_bus_is_express(pci_get_bus(dev)) 57 ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); 58 } 59 60 static GList *pxb_dev_list; 61 62 #define TYPE_PXB_HOST "pxb-host" 63 64 static int pxb_bus_num(PCIBus *bus) 65 { 66 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 67 68 return pxb->bus_nr; 69 } 70 71 static uint16_t pxb_bus_numa_node(PCIBus *bus) 72 { 73 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 74 75 return pxb->numa_node; 76 } 77 78 static void pxb_bus_class_init(ObjectClass *class, void *data) 79 { 80 PCIBusClass *pbc = PCI_BUS_CLASS(class); 81 82 pbc->bus_num = pxb_bus_num; 83 pbc->numa_node = pxb_bus_numa_node; 84 } 85 86 static const TypeInfo pxb_bus_info = { 87 .name = TYPE_PXB_BUS, 88 .parent = TYPE_PCI_BUS, 89 .instance_size = sizeof(PXBBus), 90 .class_init = pxb_bus_class_init, 91 }; 92 93 static const TypeInfo pxb_pcie_bus_info = { 94 .name = TYPE_PXB_PCIE_BUS, 95 .parent = TYPE_PCIE_BUS, 96 .instance_size = sizeof(PXBBus), 97 .class_init = pxb_bus_class_init, 98 }; 99 100 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, 101 PCIBus *rootbus) 102 { 103 PXBBus *bus = pci_bus_is_express(rootbus) ? 104 PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); 105 106 snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); 107 return bus->bus_path; 108 } 109 110 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) 111 { 112 const PCIHostState *pxb_host; 113 const PCIBus *pxb_bus; 114 const PXBDev *pxb_dev; 115 int position; 116 const DeviceState *pxb_dev_base; 117 const PCIHostState *main_host; 118 const SysBusDevice *main_host_sbd; 119 120 pxb_host = PCI_HOST_BRIDGE(dev); 121 pxb_bus = pxb_host->bus; 122 pxb_dev = convert_to_pxb(pxb_bus->parent_dev); 123 position = g_list_index(pxb_dev_list, pxb_dev); 124 assert(position >= 0); 125 126 pxb_dev_base = DEVICE(pxb_dev); 127 main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); 128 main_host_sbd = SYS_BUS_DEVICE(main_host); 129 130 if (main_host_sbd->num_mmio > 0) { 131 return g_strdup_printf(TARGET_FMT_plx ",%x", 132 main_host_sbd->mmio[0].addr, position + 1); 133 } 134 if (main_host_sbd->num_pio > 0) { 135 return g_strdup_printf("i%04x,%x", 136 main_host_sbd->pio[0], position + 1); 137 } 138 return NULL; 139 } 140 141 static void pxb_host_class_init(ObjectClass *class, void *data) 142 { 143 DeviceClass *dc = DEVICE_CLASS(class); 144 SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); 145 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); 146 147 dc->fw_name = "pci"; 148 /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ 149 dc->user_creatable = false; 150 sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; 151 hc->root_bus_path = pxb_host_root_bus_path; 152 } 153 154 static const TypeInfo pxb_host_info = { 155 .name = TYPE_PXB_HOST, 156 .parent = TYPE_PCI_HOST_BRIDGE, 157 .class_init = pxb_host_class_init, 158 }; 159 160 /* 161 * Registers the PXB bus as a child of pci host root bus. 162 */ 163 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp) 164 { 165 PCIBus *bus = pci_get_bus(dev); 166 int pxb_bus_num = pci_bus_num(pxb_bus); 167 168 if (bus->parent_dev) { 169 error_setg(errp, "PXB devices can be attached only to root bus"); 170 return; 171 } 172 173 QLIST_FOREACH(bus, &bus->child, sibling) { 174 if (pci_bus_num(bus) == pxb_bus_num) { 175 error_setg(errp, "Bus %d is already in use", pxb_bus_num); 176 return; 177 } 178 } 179 QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling); 180 } 181 182 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) 183 { 184 PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev; 185 186 /* 187 * The bios does not index the pxb slot number when 188 * it computes the IRQ because it resides on bus 0 189 * and not on the current bus. 190 * However QEMU routes the irq through bus 0 and adds 191 * the pxb slot to the IRQ computation of the PXB 192 * device. 193 * 194 * Synchronize between bios and QEMU by canceling 195 * pxb's effect. 196 */ 197 return pin - PCI_SLOT(pxb->devfn); 198 } 199 200 static gint pxb_compare(gconstpointer a, gconstpointer b) 201 { 202 const PXBDev *pxb_a = a, *pxb_b = b; 203 204 return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : 205 pxb_a->bus_nr > pxb_b->bus_nr ? 1 : 206 0; 207 } 208 209 static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp) 210 { 211 PXBDev *pxb = convert_to_pxb(dev); 212 DeviceState *ds, *bds = NULL; 213 PCIBus *bus; 214 const char *dev_name = NULL; 215 Error *local_err = NULL; 216 217 if (pxb->numa_node != NUMA_NODE_UNASSIGNED && 218 pxb->numa_node >= nb_numa_nodes) { 219 error_setg(errp, "Illegal numa node %d", pxb->numa_node); 220 return; 221 } 222 223 if (dev->qdev.id && *dev->qdev.id) { 224 dev_name = dev->qdev.id; 225 } 226 227 ds = qdev_create(NULL, TYPE_PXB_HOST); 228 if (pcie) { 229 bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); 230 } else { 231 bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); 232 bds = qdev_create(BUS(bus), "pci-bridge"); 233 bds->id = dev_name; 234 qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); 235 qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); 236 } 237 238 bus->parent_dev = dev; 239 bus->address_space_mem = pci_get_bus(dev)->address_space_mem; 240 bus->address_space_io = pci_get_bus(dev)->address_space_io; 241 bus->map_irq = pxb_map_irq_fn; 242 243 PCI_HOST_BRIDGE(ds)->bus = bus; 244 245 pxb_register_bus(dev, bus, &local_err); 246 if (local_err) { 247 error_propagate(errp, local_err); 248 goto err_register_bus; 249 } 250 251 qdev_init_nofail(ds); 252 if (bds) { 253 qdev_init_nofail(bds); 254 } 255 256 pci_word_test_and_set_mask(dev->config + PCI_STATUS, 257 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); 258 pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); 259 260 pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); 261 return; 262 263 err_register_bus: 264 object_unref(OBJECT(bds)); 265 object_unparent(OBJECT(bus)); 266 object_unref(OBJECT(ds)); 267 } 268 269 static void pxb_dev_realize(PCIDevice *dev, Error **errp) 270 { 271 if (pci_bus_is_express(pci_get_bus(dev))) { 272 error_setg(errp, "pxb devices cannot reside on a PCIe bus"); 273 return; 274 } 275 276 pxb_dev_realize_common(dev, false, errp); 277 } 278 279 static void pxb_dev_exitfn(PCIDevice *pci_dev) 280 { 281 PXBDev *pxb = convert_to_pxb(pci_dev); 282 283 pxb_dev_list = g_list_remove(pxb_dev_list, pxb); 284 } 285 286 static Property pxb_dev_properties[] = { 287 /* Note: 0 is not a legal PXB bus number. */ 288 DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0), 289 DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED), 290 DEFINE_PROP_END_OF_LIST(), 291 }; 292 293 static void pxb_dev_class_init(ObjectClass *klass, void *data) 294 { 295 DeviceClass *dc = DEVICE_CLASS(klass); 296 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 297 298 k->realize = pxb_dev_realize; 299 k->exit = pxb_dev_exitfn; 300 k->vendor_id = PCI_VENDOR_ID_REDHAT; 301 k->device_id = PCI_DEVICE_ID_REDHAT_PXB; 302 k->class_id = PCI_CLASS_BRIDGE_HOST; 303 304 dc->desc = "PCI Expander Bridge"; 305 dc->props = pxb_dev_properties; 306 dc->hotpluggable = false; 307 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 308 } 309 310 static const TypeInfo pxb_dev_info = { 311 .name = TYPE_PXB_DEVICE, 312 .parent = TYPE_PCI_DEVICE, 313 .instance_size = sizeof(PXBDev), 314 .class_init = pxb_dev_class_init, 315 .interfaces = (InterfaceInfo[]) { 316 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 317 { }, 318 }, 319 }; 320 321 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp) 322 { 323 if (!pci_bus_is_express(pci_get_bus(dev))) { 324 error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus"); 325 return; 326 } 327 328 pxb_dev_realize_common(dev, true, errp); 329 } 330 331 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) 332 { 333 DeviceClass *dc = DEVICE_CLASS(klass); 334 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 335 336 k->realize = pxb_pcie_dev_realize; 337 k->exit = pxb_dev_exitfn; 338 k->vendor_id = PCI_VENDOR_ID_REDHAT; 339 k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; 340 k->class_id = PCI_CLASS_BRIDGE_HOST; 341 342 dc->desc = "PCI Express Expander Bridge"; 343 dc->props = pxb_dev_properties; 344 dc->hotpluggable = false; 345 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 346 } 347 348 static const TypeInfo pxb_pcie_dev_info = { 349 .name = TYPE_PXB_PCIE_DEVICE, 350 .parent = TYPE_PCI_DEVICE, 351 .instance_size = sizeof(PXBDev), 352 .class_init = pxb_pcie_dev_class_init, 353 .interfaces = (InterfaceInfo[]) { 354 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 355 { }, 356 }, 357 }; 358 359 static void pxb_register_types(void) 360 { 361 type_register_static(&pxb_bus_info); 362 type_register_static(&pxb_pcie_bus_info); 363 type_register_static(&pxb_host_info); 364 type_register_static(&pxb_dev_info); 365 type_register_static(&pxb_pcie_dev_info); 366 } 367 368 type_init(pxb_register_types) 369