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 "hw/pci/pci.h" 15 #include "hw/pci/pci_bus.h" 16 #include "hw/pci/pci_host.h" 17 #include "hw/pci/pci_bus.h" 18 #include "hw/pci/pci_bridge.h" 19 #include "hw/i386/pc.h" 20 #include "qemu/range.h" 21 #include "qemu/error-report.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(dev->bus) ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); 56 } 57 58 static GList *pxb_dev_list; 59 60 #define TYPE_PXB_HOST "pxb-host" 61 62 static int pxb_bus_num(PCIBus *bus) 63 { 64 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 65 66 return pxb->bus_nr; 67 } 68 69 static bool pxb_is_root(PCIBus *bus) 70 { 71 return true; /* by definition */ 72 } 73 74 static uint16_t pxb_bus_numa_node(PCIBus *bus) 75 { 76 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 77 78 return pxb->numa_node; 79 } 80 81 static void pxb_bus_class_init(ObjectClass *class, void *data) 82 { 83 PCIBusClass *pbc = PCI_BUS_CLASS(class); 84 85 pbc->bus_num = pxb_bus_num; 86 pbc->is_root = pxb_is_root; 87 pbc->numa_node = pxb_bus_numa_node; 88 } 89 90 static const TypeInfo pxb_bus_info = { 91 .name = TYPE_PXB_BUS, 92 .parent = TYPE_PCI_BUS, 93 .instance_size = sizeof(PXBBus), 94 .class_init = pxb_bus_class_init, 95 }; 96 97 static const TypeInfo pxb_pcie_bus_info = { 98 .name = TYPE_PXB_PCIE_BUS, 99 .parent = TYPE_PCIE_BUS, 100 .instance_size = sizeof(PXBBus), 101 .class_init = pxb_bus_class_init, 102 }; 103 104 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, 105 PCIBus *rootbus) 106 { 107 PXBBus *bus = pci_bus_is_express(rootbus) ? 108 PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); 109 110 snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); 111 return bus->bus_path; 112 } 113 114 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) 115 { 116 const PCIHostState *pxb_host; 117 const PCIBus *pxb_bus; 118 const PXBDev *pxb_dev; 119 int position; 120 const DeviceState *pxb_dev_base; 121 const PCIHostState *main_host; 122 const SysBusDevice *main_host_sbd; 123 124 pxb_host = PCI_HOST_BRIDGE(dev); 125 pxb_bus = pxb_host->bus; 126 pxb_dev = convert_to_pxb(pxb_bus->parent_dev); 127 position = g_list_index(pxb_dev_list, pxb_dev); 128 assert(position >= 0); 129 130 pxb_dev_base = DEVICE(pxb_dev); 131 main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); 132 main_host_sbd = SYS_BUS_DEVICE(main_host); 133 134 if (main_host_sbd->num_mmio > 0) { 135 return g_strdup_printf(TARGET_FMT_plx ",%x", 136 main_host_sbd->mmio[0].addr, position + 1); 137 } 138 if (main_host_sbd->num_pio > 0) { 139 return g_strdup_printf("i%04x,%x", 140 main_host_sbd->pio[0], position + 1); 141 } 142 return NULL; 143 } 144 145 static void pxb_host_class_init(ObjectClass *class, void *data) 146 { 147 DeviceClass *dc = DEVICE_CLASS(class); 148 SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); 149 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); 150 151 dc->fw_name = "pci"; 152 /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ 153 dc->cannot_instantiate_with_device_add_yet = true; 154 sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; 155 hc->root_bus_path = pxb_host_root_bus_path; 156 } 157 158 static const TypeInfo pxb_host_info = { 159 .name = TYPE_PXB_HOST, 160 .parent = TYPE_PCI_HOST_BRIDGE, 161 .class_init = pxb_host_class_init, 162 }; 163 164 /* 165 * Registers the PXB bus as a child of the i440fx root bus. 166 * 167 * Returns 0 on successs, -1 if i440fx host was not 168 * found or the bus number is already in use. 169 */ 170 static int pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus) 171 { 172 PCIBus *bus = dev->bus; 173 int pxb_bus_num = pci_bus_num(pxb_bus); 174 175 if (bus->parent_dev) { 176 error_report("PXB devices can be attached only to root bus."); 177 return -1; 178 } 179 180 QLIST_FOREACH(bus, &bus->child, sibling) { 181 if (pci_bus_num(bus) == pxb_bus_num) { 182 error_report("Bus %d is already in use.", pxb_bus_num); 183 return -1; 184 } 185 } 186 QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling); 187 188 return 0; 189 } 190 191 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) 192 { 193 PCIDevice *pxb = pci_dev->bus->parent_dev; 194 195 /* 196 * The bios does not index the pxb slot number when 197 * it computes the IRQ because it resides on bus 0 198 * and not on the current bus. 199 * However QEMU routes the irq through bus 0 and adds 200 * the pxb slot to the IRQ computation of the PXB 201 * device. 202 * 203 * Synchronize between bios and QEMU by canceling 204 * pxb's effect. 205 */ 206 return pin - PCI_SLOT(pxb->devfn); 207 } 208 209 static gint pxb_compare(gconstpointer a, gconstpointer b) 210 { 211 const PXBDev *pxb_a = a, *pxb_b = b; 212 213 return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : 214 pxb_a->bus_nr > pxb_b->bus_nr ? 1 : 215 0; 216 } 217 218 static int pxb_dev_init_common(PCIDevice *dev, bool pcie) 219 { 220 PXBDev *pxb = convert_to_pxb(dev); 221 DeviceState *ds, *bds = NULL; 222 PCIBus *bus; 223 const char *dev_name = NULL; 224 225 if (pxb->numa_node != NUMA_NODE_UNASSIGNED && 226 pxb->numa_node >= nb_numa_nodes) { 227 error_report("Illegal numa node %d.", pxb->numa_node); 228 return -EINVAL; 229 } 230 231 if (dev->qdev.id && *dev->qdev.id) { 232 dev_name = dev->qdev.id; 233 } 234 235 ds = qdev_create(NULL, TYPE_PXB_HOST); 236 if (pcie) { 237 bus = pci_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); 238 } else { 239 bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); 240 bds = qdev_create(BUS(bus), "pci-bridge"); 241 bds->id = dev_name; 242 qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); 243 qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); 244 } 245 246 bus->parent_dev = dev; 247 bus->address_space_mem = dev->bus->address_space_mem; 248 bus->address_space_io = dev->bus->address_space_io; 249 bus->map_irq = pxb_map_irq_fn; 250 251 PCI_HOST_BRIDGE(ds)->bus = bus; 252 253 if (pxb_register_bus(dev, bus)) { 254 goto err_register_bus; 255 } 256 257 qdev_init_nofail(ds); 258 if (bds) { 259 qdev_init_nofail(bds); 260 } 261 262 pci_word_test_and_set_mask(dev->config + PCI_STATUS, 263 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); 264 pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); 265 266 pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); 267 return 0; 268 269 err_register_bus: 270 object_unref(OBJECT(bds)); 271 object_unparent(OBJECT(bus)); 272 object_unref(OBJECT(ds)); 273 return -EINVAL; 274 } 275 276 static int pxb_dev_initfn(PCIDevice *dev) 277 { 278 if (pci_bus_is_express(dev->bus)) { 279 error_report("pxb devices cannot reside on a PCIe bus!"); 280 return -EINVAL; 281 } 282 283 return pxb_dev_init_common(dev, false); 284 } 285 286 static void pxb_dev_exitfn(PCIDevice *pci_dev) 287 { 288 PXBDev *pxb = convert_to_pxb(pci_dev); 289 290 pxb_dev_list = g_list_remove(pxb_dev_list, pxb); 291 } 292 293 static Property pxb_dev_properties[] = { 294 /* Note: 0 is not a legal PXB bus number. */ 295 DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0), 296 DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED), 297 DEFINE_PROP_END_OF_LIST(), 298 }; 299 300 static void pxb_dev_class_init(ObjectClass *klass, void *data) 301 { 302 DeviceClass *dc = DEVICE_CLASS(klass); 303 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 304 305 k->init = pxb_dev_initfn; 306 k->exit = pxb_dev_exitfn; 307 k->vendor_id = PCI_VENDOR_ID_REDHAT; 308 k->device_id = PCI_DEVICE_ID_REDHAT_PXB; 309 k->class_id = PCI_CLASS_BRIDGE_HOST; 310 311 dc->desc = "PCI Expander Bridge"; 312 dc->props = pxb_dev_properties; 313 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 314 } 315 316 static const TypeInfo pxb_dev_info = { 317 .name = TYPE_PXB_DEVICE, 318 .parent = TYPE_PCI_DEVICE, 319 .instance_size = sizeof(PXBDev), 320 .class_init = pxb_dev_class_init, 321 }; 322 323 static int pxb_pcie_dev_initfn(PCIDevice *dev) 324 { 325 if (!pci_bus_is_express(dev->bus)) { 326 error_report("pxb-pcie devices cannot reside on a PCI bus!"); 327 return -EINVAL; 328 } 329 330 return pxb_dev_init_common(dev, true); 331 } 332 333 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) 334 { 335 DeviceClass *dc = DEVICE_CLASS(klass); 336 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 337 338 k->init = pxb_pcie_dev_initfn; 339 k->exit = pxb_dev_exitfn; 340 k->vendor_id = PCI_VENDOR_ID_REDHAT; 341 k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; 342 k->class_id = PCI_CLASS_BRIDGE_HOST; 343 344 dc->desc = "PCI Express Expander Bridge"; 345 dc->props = pxb_dev_properties; 346 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 347 } 348 349 static const TypeInfo pxb_pcie_dev_info = { 350 .name = TYPE_PXB_PCIE_DEVICE, 351 .parent = TYPE_PCI_DEVICE, 352 .instance_size = sizeof(PXBDev), 353 .class_init = pxb_pcie_dev_class_init, 354 }; 355 356 static void pxb_register_types(void) 357 { 358 type_register_static(&pxb_bus_info); 359 type_register_static(&pxb_pcie_bus_info); 360 type_register_static(&pxb_host_info); 361 type_register_static(&pxb_dev_info); 362 type_register_static(&pxb_pcie_dev_info); 363 } 364 365 type_init(pxb_register_types) 366