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_bus.h" 19 #include "hw/pci/pci_bridge.h" 20 #include "hw/i386/pc.h" 21 #include "qemu/range.h" 22 #include "qemu/error-report.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(dev->bus) ? 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 bool pxb_is_root(PCIBus *bus) 71 { 72 return true; /* by definition */ 73 } 74 75 static uint16_t pxb_bus_numa_node(PCIBus *bus) 76 { 77 PXBDev *pxb = convert_to_pxb(bus->parent_dev); 78 79 return pxb->numa_node; 80 } 81 82 static void pxb_bus_class_init(ObjectClass *class, void *data) 83 { 84 PCIBusClass *pbc = PCI_BUS_CLASS(class); 85 86 pbc->bus_num = pxb_bus_num; 87 pbc->is_root = pxb_is_root; 88 pbc->numa_node = pxb_bus_numa_node; 89 } 90 91 static const TypeInfo pxb_bus_info = { 92 .name = TYPE_PXB_BUS, 93 .parent = TYPE_PCI_BUS, 94 .instance_size = sizeof(PXBBus), 95 .class_init = pxb_bus_class_init, 96 }; 97 98 static const TypeInfo pxb_pcie_bus_info = { 99 .name = TYPE_PXB_PCIE_BUS, 100 .parent = TYPE_PCIE_BUS, 101 .instance_size = sizeof(PXBBus), 102 .class_init = pxb_bus_class_init, 103 }; 104 105 static const char *pxb_host_root_bus_path(PCIHostState *host_bridge, 106 PCIBus *rootbus) 107 { 108 PXBBus *bus = pci_bus_is_express(rootbus) ? 109 PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); 110 111 snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); 112 return bus->bus_path; 113 } 114 115 static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) 116 { 117 const PCIHostState *pxb_host; 118 const PCIBus *pxb_bus; 119 const PXBDev *pxb_dev; 120 int position; 121 const DeviceState *pxb_dev_base; 122 const PCIHostState *main_host; 123 const SysBusDevice *main_host_sbd; 124 125 pxb_host = PCI_HOST_BRIDGE(dev); 126 pxb_bus = pxb_host->bus; 127 pxb_dev = convert_to_pxb(pxb_bus->parent_dev); 128 position = g_list_index(pxb_dev_list, pxb_dev); 129 assert(position >= 0); 130 131 pxb_dev_base = DEVICE(pxb_dev); 132 main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); 133 main_host_sbd = SYS_BUS_DEVICE(main_host); 134 135 if (main_host_sbd->num_mmio > 0) { 136 return g_strdup_printf(TARGET_FMT_plx ",%x", 137 main_host_sbd->mmio[0].addr, position + 1); 138 } 139 if (main_host_sbd->num_pio > 0) { 140 return g_strdup_printf("i%04x,%x", 141 main_host_sbd->pio[0], position + 1); 142 } 143 return NULL; 144 } 145 146 static void pxb_host_class_init(ObjectClass *class, void *data) 147 { 148 DeviceClass *dc = DEVICE_CLASS(class); 149 SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); 150 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); 151 152 dc->fw_name = "pci"; 153 /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ 154 dc->cannot_instantiate_with_device_add_yet = true; 155 sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; 156 hc->root_bus_path = pxb_host_root_bus_path; 157 } 158 159 static const TypeInfo pxb_host_info = { 160 .name = TYPE_PXB_HOST, 161 .parent = TYPE_PCI_HOST_BRIDGE, 162 .class_init = pxb_host_class_init, 163 }; 164 165 /* 166 * Registers the PXB bus as a child of pci host root bus. 167 */ 168 static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp) 169 { 170 PCIBus *bus = dev->bus; 171 int pxb_bus_num = pci_bus_num(pxb_bus); 172 173 if (bus->parent_dev) { 174 error_setg(errp, "PXB devices can be attached only to root bus"); 175 return; 176 } 177 178 QLIST_FOREACH(bus, &bus->child, sibling) { 179 if (pci_bus_num(bus) == pxb_bus_num) { 180 error_setg(errp, "Bus %d is already in use", pxb_bus_num); 181 return; 182 } 183 } 184 QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling); 185 } 186 187 static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) 188 { 189 PCIDevice *pxb = pci_dev->bus->parent_dev; 190 191 /* 192 * The bios does not index the pxb slot number when 193 * it computes the IRQ because it resides on bus 0 194 * and not on the current bus. 195 * However QEMU routes the irq through bus 0 and adds 196 * the pxb slot to the IRQ computation of the PXB 197 * device. 198 * 199 * Synchronize between bios and QEMU by canceling 200 * pxb's effect. 201 */ 202 return pin - PCI_SLOT(pxb->devfn); 203 } 204 205 static gint pxb_compare(gconstpointer a, gconstpointer b) 206 { 207 const PXBDev *pxb_a = a, *pxb_b = b; 208 209 return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : 210 pxb_a->bus_nr > pxb_b->bus_nr ? 1 : 211 0; 212 } 213 214 static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp) 215 { 216 PXBDev *pxb = convert_to_pxb(dev); 217 DeviceState *ds, *bds = NULL; 218 PCIBus *bus; 219 const char *dev_name = NULL; 220 Error *local_err = NULL; 221 222 if (pxb->numa_node != NUMA_NODE_UNASSIGNED && 223 pxb->numa_node >= nb_numa_nodes) { 224 error_setg(errp, "Illegal numa node %d", pxb->numa_node); 225 return; 226 } 227 228 if (dev->qdev.id && *dev->qdev.id) { 229 dev_name = dev->qdev.id; 230 } 231 232 ds = qdev_create(NULL, TYPE_PXB_HOST); 233 if (pcie) { 234 bus = pci_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); 235 } else { 236 bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); 237 bds = qdev_create(BUS(bus), "pci-bridge"); 238 bds->id = dev_name; 239 qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); 240 qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); 241 } 242 243 bus->parent_dev = dev; 244 bus->address_space_mem = dev->bus->address_space_mem; 245 bus->address_space_io = dev->bus->address_space_io; 246 bus->map_irq = pxb_map_irq_fn; 247 248 PCI_HOST_BRIDGE(ds)->bus = bus; 249 250 pxb_register_bus(dev, bus, &local_err); 251 if (local_err) { 252 error_propagate(errp, local_err); 253 goto err_register_bus; 254 } 255 256 qdev_init_nofail(ds); 257 if (bds) { 258 qdev_init_nofail(bds); 259 } 260 261 pci_word_test_and_set_mask(dev->config + PCI_STATUS, 262 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK); 263 pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST); 264 265 pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); 266 return; 267 268 err_register_bus: 269 object_unref(OBJECT(bds)); 270 object_unparent(OBJECT(bus)); 271 object_unref(OBJECT(ds)); 272 } 273 274 static void pxb_dev_realize(PCIDevice *dev, Error **errp) 275 { 276 if (pci_bus_is_express(dev->bus)) { 277 error_setg(errp, "pxb devices cannot reside on a PCIe bus"); 278 return; 279 } 280 281 pxb_dev_realize_common(dev, false, errp); 282 } 283 284 static void pxb_dev_exitfn(PCIDevice *pci_dev) 285 { 286 PXBDev *pxb = convert_to_pxb(pci_dev); 287 288 pxb_dev_list = g_list_remove(pxb_dev_list, pxb); 289 } 290 291 static Property pxb_dev_properties[] = { 292 /* Note: 0 is not a legal PXB bus number. */ 293 DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0), 294 DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED), 295 DEFINE_PROP_END_OF_LIST(), 296 }; 297 298 static void pxb_dev_class_init(ObjectClass *klass, void *data) 299 { 300 DeviceClass *dc = DEVICE_CLASS(klass); 301 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 302 303 k->realize = pxb_dev_realize; 304 k->exit = pxb_dev_exitfn; 305 k->vendor_id = PCI_VENDOR_ID_REDHAT; 306 k->device_id = PCI_DEVICE_ID_REDHAT_PXB; 307 k->class_id = PCI_CLASS_BRIDGE_HOST; 308 309 dc->desc = "PCI Expander Bridge"; 310 dc->props = pxb_dev_properties; 311 dc->hotpluggable = false; 312 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 313 } 314 315 static const TypeInfo pxb_dev_info = { 316 .name = TYPE_PXB_DEVICE, 317 .parent = TYPE_PCI_DEVICE, 318 .instance_size = sizeof(PXBDev), 319 .class_init = pxb_dev_class_init, 320 }; 321 322 static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp) 323 { 324 if (!pci_bus_is_express(dev->bus)) { 325 error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus"); 326 return; 327 } 328 329 pxb_dev_realize_common(dev, true, errp); 330 } 331 332 static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) 333 { 334 DeviceClass *dc = DEVICE_CLASS(klass); 335 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 336 337 k->realize = pxb_pcie_dev_realize; 338 k->exit = pxb_dev_exitfn; 339 k->vendor_id = PCI_VENDOR_ID_REDHAT; 340 k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; 341 k->class_id = PCI_CLASS_BRIDGE_HOST; 342 343 dc->desc = "PCI Express Expander Bridge"; 344 dc->props = pxb_dev_properties; 345 dc->hotpluggable = false; 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