1 /* 2 * QEMU PowerPC PowerNV Proxy PHB model 3 * 4 * Copyright (c) 2022, IBM Corporation. 5 * 6 * This code is licensed under the GPL version 2 or later. See the 7 * COPYING file in the top-level directory. 8 */ 9 10 #include "qemu/osdep.h" 11 #include "qemu/log.h" 12 #include "qapi/visitor.h" 13 #include "qapi/error.h" 14 #include "hw/pci-host/pnv_phb.h" 15 #include "hw/pci-host/pnv_phb3.h" 16 #include "hw/pci-host/pnv_phb4.h" 17 #include "hw/ppc/pnv.h" 18 #include "hw/qdev-properties.h" 19 #include "qom/object.h" 20 #include "system/system.h" 21 22 23 /* 24 * Set the QOM parent and parent bus of an object child. If the device 25 * state associated with the child has an id, use it as QOM id. 26 * Otherwise use object_typename[index] as QOM id. 27 * 28 * This helper does both operations at the same time because setting 29 * a new QOM child will erase the bus parent of the device. This happens 30 * because object_unparent() will call object_property_del_child(), 31 * which in turn calls the property release callback prop->release if 32 * it's defined. In our case this callback is set to 33 * object_finalize_child_property(), which was assigned during the 34 * first object_property_add_child() call. This callback will end up 35 * calling device_unparent(), and this function removes the device 36 * from its parent bus. 37 * 38 * The QOM and parent bus to be set aren´t necessarily related, so 39 * let's receive both as arguments. 40 */ 41 static bool pnv_parent_fixup(Object *parent, BusState *parent_bus, 42 Object *child, int index, 43 Error **errp) 44 { 45 g_autofree char *default_id = 46 g_strdup_printf("%s[%d]", object_get_typename(child), index); 47 const char *dev_id = DEVICE(child)->id; 48 49 if (child->parent == parent) { 50 return true; 51 } 52 53 object_ref(child); 54 object_unparent(child); 55 object_property_add_child(parent, dev_id ? dev_id : default_id, child); 56 object_unref(child); 57 58 if (!qdev_set_parent_bus(DEVICE(child), parent_bus, errp)) { 59 return false; 60 } 61 62 return true; 63 } 64 65 static Object *pnv_phb_user_get_parent(PnvChip *chip, PnvPHB *phb, Error **errp) 66 { 67 if (phb->version == 3) { 68 return OBJECT(pnv_chip_add_phb(chip, phb)); 69 } else { 70 return OBJECT(pnv_pec_add_phb(chip, phb, errp)); 71 } 72 } 73 74 /* 75 * User created devices won't have the initial setup that default 76 * devices have. This setup consists of assigning a parent device 77 * (chip for PHB3, PEC for PHB4/5) that will be the QOM/bus parent 78 * of the PHB. 79 */ 80 static bool pnv_phb_user_device_init(PnvPHB *phb, Error **errp) 81 { 82 PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine()); 83 PnvChip *chip = pnv_get_chip(pnv, phb->chip_id); 84 Object *parent = NULL; 85 86 if (!chip) { 87 error_setg(errp, "invalid chip id: %d", phb->chip_id); 88 return false; 89 } 90 91 parent = pnv_phb_user_get_parent(chip, phb, errp); 92 if (!parent) { 93 return false; 94 } 95 96 /* 97 * Reparent user created devices to the chip to build 98 * correctly the device tree. pnv_xscom_dt() needs every 99 * PHB to be a child of the chip to build the DT correctly. 100 */ 101 if (!pnv_parent_fixup(parent, qdev_get_parent_bus(DEVICE(chip)), 102 OBJECT(phb), phb->phb_id, errp)) { 103 return false; 104 } 105 106 return true; 107 } 108 109 static void pnv_phb_realize(DeviceState *dev, Error **errp) 110 { 111 PnvPHB *phb = PNV_PHB(dev); 112 PCIHostState *pci = PCI_HOST_BRIDGE(dev); 113 g_autofree char *phb_typename = NULL; 114 115 if (!phb->version) { 116 error_setg(errp, "version not specified"); 117 return; 118 } 119 120 switch (phb->version) { 121 case 3: 122 phb_typename = g_strdup(TYPE_PNV_PHB3); 123 break; 124 case 4: 125 phb_typename = g_strdup(TYPE_PNV_PHB4); 126 break; 127 case 5: 128 phb_typename = g_strdup(TYPE_PNV_PHB5); 129 break; 130 default: 131 g_assert_not_reached(); 132 } 133 134 phb->backend = object_new(phb_typename); 135 object_property_add_child(OBJECT(dev), "phb-backend", phb->backend); 136 137 /* Passthrough child device properties to the proxy device */ 138 object_property_set_uint(phb->backend, "index", phb->phb_id, errp); 139 object_property_set_uint(phb->backend, "chip-id", phb->chip_id, errp); 140 object_property_set_link(phb->backend, "phb-base", OBJECT(phb), errp); 141 142 /* 143 * Handle user created devices. User devices will not have a 144 * pointer to a chip (PHB3) and a PEC (PHB4/5). 145 */ 146 if (!phb->chip && !phb->pec) { 147 if (!pnv_phb_user_device_init(phb, errp)) { 148 return; 149 } 150 } 151 152 if (phb->version == 3) { 153 object_property_set_link(phb->backend, "chip", 154 OBJECT(phb->chip), errp); 155 } else { 156 object_property_set_link(phb->backend, "pec", OBJECT(phb->pec), errp); 157 } 158 159 if (!qdev_realize(DEVICE(phb->backend), NULL, errp)) { 160 return; 161 } 162 163 if (phb->version == 3) { 164 pnv_phb3_bus_init(dev, PNV_PHB3(phb->backend)); 165 } else { 166 pnv_phb4_bus_init(dev, PNV_PHB4(phb->backend)); 167 } 168 169 if (defaults_enabled()) { 170 PCIDevice *root = pci_new(PCI_DEVFN(0, 0), TYPE_PNV_PHB_ROOT_PORT); 171 172 pci_realize_and_unref(root, pci->bus, errp); 173 } 174 } 175 176 static const char *pnv_phb_root_bus_path(PCIHostState *host_bridge, 177 PCIBus *rootbus) 178 { 179 PnvPHB *phb = PNV_PHB(host_bridge); 180 181 snprintf(phb->bus_path, sizeof(phb->bus_path), "00%02x:%02x", 182 phb->chip_id, phb->phb_id); 183 return phb->bus_path; 184 } 185 186 static const Property pnv_phb_properties[] = { 187 DEFINE_PROP_UINT32("index", PnvPHB, phb_id, 0), 188 DEFINE_PROP_UINT32("chip-id", PnvPHB, chip_id, 0), 189 DEFINE_PROP_UINT32("version", PnvPHB, version, 0), 190 191 DEFINE_PROP_LINK("chip", PnvPHB, chip, TYPE_PNV_CHIP, PnvChip *), 192 193 DEFINE_PROP_LINK("pec", PnvPHB, pec, TYPE_PNV_PHB4_PEC, 194 PnvPhb4PecState *), 195 }; 196 197 static void pnv_phb_class_init(ObjectClass *klass, const void *data) 198 { 199 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); 200 DeviceClass *dc = DEVICE_CLASS(klass); 201 202 hc->root_bus_path = pnv_phb_root_bus_path; 203 dc->realize = pnv_phb_realize; 204 device_class_set_props(dc, pnv_phb_properties); 205 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 206 dc->user_creatable = true; 207 } 208 209 static void pnv_phb_root_port_reset_hold(Object *obj, ResetType type) 210 { 211 PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(obj); 212 PnvPHBRootPort *phb_rp = PNV_PHB_ROOT_PORT(obj); 213 PCIDevice *d = PCI_DEVICE(obj); 214 uint8_t *conf = d->config; 215 216 if (rpc->parent_phases.hold) { 217 rpc->parent_phases.hold(obj, type); 218 } 219 220 if (phb_rp->version == 3) { 221 return; 222 } 223 224 /* PHB4 and later requires these extra reset steps */ 225 pci_byte_test_and_set_mask(conf + PCI_IO_BASE, 226 PCI_IO_RANGE_MASK & 0xff); 227 pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT, 228 PCI_IO_RANGE_MASK & 0xff); 229 pci_set_word(conf + PCI_MEMORY_BASE, 0); 230 pci_set_word(conf + PCI_MEMORY_LIMIT, 0xfff0); 231 pci_set_word(conf + PCI_PREF_MEMORY_BASE, 0x1); 232 pci_set_word(conf + PCI_PREF_MEMORY_LIMIT, 0xfff1); 233 pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0x1); /* Hack */ 234 pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0xffffffff); 235 pci_config_set_interrupt_pin(conf, 0); 236 } 237 238 static void pnv_phb_root_port_realize(DeviceState *dev, Error **errp) 239 { 240 PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev); 241 PnvPHBRootPort *phb_rp = PNV_PHB_ROOT_PORT(dev); 242 PCIBus *bus = PCI_BUS(qdev_get_parent_bus(dev)); 243 PCIDevice *pci = PCI_DEVICE(dev); 244 uint16_t device_id = 0; 245 Error *local_err = NULL; 246 int chip_id, index; 247 248 /* 249 * 'index' will be used both as a PCIE slot value and to calculate 250 * QOM id. 'chip_id' is going to be used as PCIE chassis for the 251 * root port. 252 */ 253 chip_id = object_property_get_int(OBJECT(bus), "chip-id", &local_err); 254 if (local_err) { 255 error_propagate(errp, local_err); 256 return; 257 } 258 index = object_property_get_int(OBJECT(bus), "phb-id", &local_err); 259 if (local_err) { 260 error_propagate(errp, local_err); 261 return; 262 } 263 264 /* Set unique chassis/slot values for the root port */ 265 qdev_prop_set_uint8(dev, "chassis", chip_id); 266 qdev_prop_set_uint16(dev, "slot", index); 267 268 /* 269 * User created root ports are QOM parented to one of 270 * the peripheral containers but it's already at the right 271 * parent bus. Change the QOM parent to be the same as the 272 * parent bus it's already assigned to. 273 */ 274 if (!pnv_parent_fixup(OBJECT(bus), BUS(bus), OBJECT(dev), 275 index, errp)) { 276 return; 277 } 278 279 rpc->parent_realize(dev, &local_err); 280 if (local_err) { 281 error_propagate(errp, local_err); 282 return; 283 } 284 285 switch (phb_rp->version) { 286 case 3: 287 device_id = PNV_PHB3_DEVICE_ID; 288 break; 289 case 4: 290 device_id = PNV_PHB4_DEVICE_ID; 291 break; 292 case 5: 293 device_id = PNV_PHB5_DEVICE_ID; 294 break; 295 default: 296 g_assert_not_reached(); 297 } 298 299 pci_config_set_device_id(pci->config, device_id); 300 pci_config_set_interrupt_pin(pci->config, 0); 301 } 302 303 static const Property pnv_phb_root_port_properties[] = { 304 DEFINE_PROP_UINT32("version", PnvPHBRootPort, version, 0), 305 }; 306 307 static void pnv_phb_root_port_class_init(ObjectClass *klass, const void *data) 308 { 309 DeviceClass *dc = DEVICE_CLASS(klass); 310 ResettableClass *rc = RESETTABLE_CLASS(klass); 311 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 312 PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(klass); 313 314 dc->desc = "IBM PHB PCIE Root Port"; 315 316 device_class_set_props(dc, pnv_phb_root_port_properties); 317 device_class_set_parent_realize(dc, pnv_phb_root_port_realize, 318 &rpc->parent_realize); 319 resettable_class_set_parent_phases(rc, NULL, pnv_phb_root_port_reset_hold, 320 NULL, &rpc->parent_phases); 321 dc->user_creatable = true; 322 323 k->vendor_id = PCI_VENDOR_ID_IBM; 324 /* device_id will be written during realize() */ 325 k->device_id = 0; 326 k->revision = 0; 327 328 rpc->exp_offset = 0x48; 329 rpc->aer_offset = 0x100; 330 } 331 332 static const TypeInfo pnv_phb_type_info = { 333 .name = TYPE_PNV_PHB, 334 .parent = TYPE_PCIE_HOST_BRIDGE, 335 .instance_size = sizeof(PnvPHB), 336 .class_init = pnv_phb_class_init, 337 }; 338 339 static const TypeInfo pnv_phb_root_port_info = { 340 .name = TYPE_PNV_PHB_ROOT_PORT, 341 .parent = TYPE_PCIE_ROOT_PORT, 342 .instance_size = sizeof(PnvPHBRootPort), 343 .class_init = pnv_phb_root_port_class_init, 344 }; 345 346 static void pnv_phb_register_types(void) 347 { 348 type_register_static(&pnv_phb_type_info); 349 type_register_static(&pnv_phb_root_port_info); 350 } 351 352 type_init(pnv_phb_register_types) 353