1 /* 2 * QEMU sPAPR VIO code 3 * 4 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com> 5 * Based on the s390 virtio bus code: 6 * Copyright (c) 2009 Alexander Graf <agraf@suse.de> 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qemu/error-report.h" 24 #include "qapi/error.h" 25 #include "hw/hw.h" 26 #include "qemu/log.h" 27 #include "sysemu/sysemu.h" 28 #include "hw/boards.h" 29 #include "hw/loader.h" 30 #include "elf.h" 31 #include "hw/sysbus.h" 32 #include "sysemu/kvm.h" 33 #include "sysemu/device_tree.h" 34 #include "kvm_ppc.h" 35 36 #include "hw/ppc/spapr.h" 37 #include "hw/ppc/spapr_vio.h" 38 #include "hw/ppc/xics.h" 39 40 #include <libfdt.h> 41 42 /* #define DEBUG_SPAPR */ 43 44 #ifdef DEBUG_SPAPR 45 #define DPRINTF(fmt, ...) \ 46 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) 47 #else 48 #define DPRINTF(fmt, ...) \ 49 do { } while (0) 50 #endif 51 52 static Property spapr_vio_props[] = { 53 DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \ 54 DEFINE_PROP_END_OF_LIST(), 55 }; 56 57 static char *spapr_vio_get_dev_name(DeviceState *qdev) 58 { 59 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 60 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 61 62 /* Device tree style name device@reg */ 63 return g_strdup_printf("%s@%x", pc->dt_name, dev->reg); 64 } 65 66 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data) 67 { 68 BusClass *k = BUS_CLASS(klass); 69 70 k->get_dev_path = spapr_vio_get_dev_name; 71 k->get_fw_dev_path = spapr_vio_get_dev_name; 72 } 73 74 static const TypeInfo spapr_vio_bus_info = { 75 .name = TYPE_SPAPR_VIO_BUS, 76 .parent = TYPE_BUS, 77 .class_init = spapr_vio_bus_class_init, 78 .instance_size = sizeof(VIOsPAPRBus), 79 }; 80 81 VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg) 82 { 83 BusChild *kid; 84 VIOsPAPRDevice *dev = NULL; 85 86 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 87 dev = (VIOsPAPRDevice *)kid->child; 88 if (dev->reg == reg) { 89 return dev; 90 } 91 } 92 93 return NULL; 94 } 95 96 static int vio_make_devnode(VIOsPAPRDevice *dev, 97 void *fdt) 98 { 99 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 100 int vdevice_off, node_off, ret; 101 char *dt_name; 102 103 vdevice_off = fdt_path_offset(fdt, "/vdevice"); 104 if (vdevice_off < 0) { 105 return vdevice_off; 106 } 107 108 dt_name = spapr_vio_get_dev_name(DEVICE(dev)); 109 node_off = fdt_add_subnode(fdt, vdevice_off, dt_name); 110 g_free(dt_name); 111 if (node_off < 0) { 112 return node_off; 113 } 114 115 ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg); 116 if (ret < 0) { 117 return ret; 118 } 119 120 if (pc->dt_type) { 121 ret = fdt_setprop_string(fdt, node_off, "device_type", 122 pc->dt_type); 123 if (ret < 0) { 124 return ret; 125 } 126 } 127 128 if (pc->dt_compatible) { 129 ret = fdt_setprop_string(fdt, node_off, "compatible", 130 pc->dt_compatible); 131 if (ret < 0) { 132 return ret; 133 } 134 } 135 136 if (dev->irq) { 137 uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0}; 138 139 ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop, 140 sizeof(ints_prop)); 141 if (ret < 0) { 142 return ret; 143 } 144 } 145 146 ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet); 147 if (ret < 0) { 148 return ret; 149 } 150 151 if (pc->devnode) { 152 ret = (pc->devnode)(dev, fdt, node_off); 153 if (ret < 0) { 154 return ret; 155 } 156 } 157 158 return node_off; 159 } 160 161 /* 162 * CRQ handling 163 */ 164 static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 165 target_ulong opcode, target_ulong *args) 166 { 167 target_ulong reg = args[0]; 168 target_ulong queue_addr = args[1]; 169 target_ulong queue_len = args[2]; 170 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 171 172 if (!dev) { 173 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 174 return H_PARAMETER; 175 } 176 177 /* We can't grok a queue size bigger than 256M for now */ 178 if (queue_len < 0x1000 || queue_len > 0x10000000) { 179 hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx 180 ")\n", queue_len); 181 return H_PARAMETER; 182 } 183 184 /* Check queue alignment */ 185 if (queue_addr & 0xfff) { 186 hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr); 187 return H_PARAMETER; 188 } 189 190 /* Check if device supports CRQs */ 191 if (!dev->crq.SendFunc) { 192 hcall_dprintf("Device does not support CRQ\n"); 193 return H_NOT_FOUND; 194 } 195 196 /* Already a queue ? */ 197 if (dev->crq.qsize) { 198 hcall_dprintf("CRQ already registered\n"); 199 return H_RESOURCE; 200 } 201 dev->crq.qladdr = queue_addr; 202 dev->crq.qsize = queue_len; 203 dev->crq.qnext = 0; 204 205 DPRINTF("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x" 206 TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n", 207 reg, queue_addr, queue_len); 208 return H_SUCCESS; 209 } 210 211 static target_ulong free_crq(VIOsPAPRDevice *dev) 212 { 213 dev->crq.qladdr = 0; 214 dev->crq.qsize = 0; 215 dev->crq.qnext = 0; 216 217 DPRINTF("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg); 218 219 return H_SUCCESS; 220 } 221 222 static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 223 target_ulong opcode, target_ulong *args) 224 { 225 target_ulong reg = args[0]; 226 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 227 228 if (!dev) { 229 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 230 return H_PARAMETER; 231 } 232 233 return free_crq(dev); 234 } 235 236 static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 237 target_ulong opcode, target_ulong *args) 238 { 239 target_ulong reg = args[0]; 240 target_ulong msg_hi = args[1]; 241 target_ulong msg_lo = args[2]; 242 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 243 uint64_t crq_mangle[2]; 244 245 if (!dev) { 246 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 247 return H_PARAMETER; 248 } 249 crq_mangle[0] = cpu_to_be64(msg_hi); 250 crq_mangle[1] = cpu_to_be64(msg_lo); 251 252 if (dev->crq.SendFunc) { 253 return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle); 254 } 255 256 return H_HARDWARE; 257 } 258 259 static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 260 target_ulong opcode, target_ulong *args) 261 { 262 target_ulong reg = args[0]; 263 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 264 265 if (!dev) { 266 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 267 return H_PARAMETER; 268 } 269 270 return 0; 271 } 272 273 /* Returns negative error, 0 success, or positive: queue full */ 274 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq) 275 { 276 int rc; 277 uint8_t byte; 278 279 if (!dev->crq.qsize) { 280 error_report("spapr_vio_send_creq on uninitialized queue"); 281 return -1; 282 } 283 284 /* Maybe do a fast path for KVM just writing to the pages */ 285 rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1); 286 if (rc) { 287 return rc; 288 } 289 if (byte != 0) { 290 return 1; 291 } 292 293 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8, 294 &crq[8], 8); 295 if (rc) { 296 return rc; 297 } 298 299 kvmppc_eieio(); 300 301 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8); 302 if (rc) { 303 return rc; 304 } 305 306 dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize; 307 308 if (dev->signal_state & 1) { 309 qemu_irq_pulse(spapr_vio_qirq(dev)); 310 } 311 312 return 0; 313 } 314 315 /* "quiesce" handling */ 316 317 static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev) 318 { 319 if (dev->tcet) { 320 device_reset(DEVICE(dev->tcet)); 321 } 322 free_crq(dev); 323 } 324 325 void spapr_vio_set_bypass(VIOsPAPRDevice *dev, bool bypass) 326 { 327 if (!dev->tcet) { 328 return; 329 } 330 331 memory_region_set_enabled(&dev->mrbypass, bypass); 332 memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass); 333 334 dev->tcet->bypass = bypass; 335 } 336 337 static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPRMachineState *spapr, 338 uint32_t token, 339 uint32_t nargs, target_ulong args, 340 uint32_t nret, target_ulong rets) 341 { 342 VIOsPAPRBus *bus = spapr->vio_bus; 343 VIOsPAPRDevice *dev; 344 uint32_t unit, enable; 345 346 if (nargs != 2) { 347 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 348 return; 349 } 350 unit = rtas_ld(args, 0); 351 enable = rtas_ld(args, 1); 352 dev = spapr_vio_find_by_reg(bus, unit); 353 if (!dev) { 354 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 355 return; 356 } 357 358 if (!dev->tcet) { 359 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 360 return; 361 } 362 363 spapr_vio_set_bypass(dev, !!enable); 364 365 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 366 } 367 368 static void rtas_quiesce(PowerPCCPU *cpu, sPAPRMachineState *spapr, 369 uint32_t token, 370 uint32_t nargs, target_ulong args, 371 uint32_t nret, target_ulong rets) 372 { 373 VIOsPAPRBus *bus = spapr->vio_bus; 374 BusChild *kid; 375 VIOsPAPRDevice *dev = NULL; 376 377 if (nargs != 0) { 378 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 379 return; 380 } 381 382 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 383 dev = (VIOsPAPRDevice *)kid->child; 384 spapr_vio_quiesce_one(dev); 385 } 386 387 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 388 } 389 390 static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev) 391 { 392 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); 393 BusChild *kid; 394 VIOsPAPRDevice *other; 395 396 /* 397 * Check for a device other than the given one which is already 398 * using the requested address. We have to open code this because 399 * the given dev might already be in the list. 400 */ 401 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 402 other = VIO_SPAPR_DEVICE(kid->child); 403 404 if (other != dev && other->reg == dev->reg) { 405 return other; 406 } 407 } 408 409 return 0; 410 } 411 412 static void spapr_vio_busdev_reset(DeviceState *qdev) 413 { 414 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 415 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 416 417 /* Shut down the request queue and TCEs if necessary */ 418 spapr_vio_quiesce_one(dev); 419 420 dev->signal_state = 0; 421 422 spapr_vio_set_bypass(dev, false); 423 if (pc->reset) { 424 pc->reset(dev); 425 } 426 } 427 428 static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp) 429 { 430 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 431 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev; 432 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 433 char *id; 434 Error *local_err = NULL; 435 436 if (dev->reg != -1) { 437 /* 438 * Explicitly assigned address, just verify that no-one else 439 * is using it. other mechanism). We have to open code this 440 * rather than using spapr_vio_find_by_reg() because sdev 441 * itself is already in the list. 442 */ 443 VIOsPAPRDevice *other = reg_conflict(dev); 444 445 if (other) { 446 error_setg(errp, "%s and %s devices conflict at address %#x", 447 object_get_typename(OBJECT(qdev)), 448 object_get_typename(OBJECT(&other->qdev)), 449 dev->reg); 450 return; 451 } 452 } else { 453 /* Need to assign an address */ 454 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); 455 456 do { 457 dev->reg = bus->next_reg++; 458 } while (reg_conflict(dev)); 459 } 460 461 /* Don't overwrite ids assigned on the command line */ 462 if (!dev->qdev.id) { 463 id = spapr_vio_get_dev_name(DEVICE(dev)); 464 dev->qdev.id = id; 465 } 466 467 dev->irq = xics_spapr_alloc(spapr->xics, 0, dev->irq, false, &local_err); 468 if (local_err) { 469 error_propagate(errp, local_err); 470 return; 471 } 472 473 if (pc->rtce_window_size) { 474 uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg); 475 476 memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root", 477 ram_size); 478 memory_region_init_alias(&dev->mrbypass, OBJECT(dev), 479 "iommu-spapr-bypass", get_system_memory(), 480 0, ram_size); 481 memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1); 482 address_space_init(&dev->as, &dev->mrroot, qdev->id); 483 484 dev->tcet = spapr_tce_new_table(qdev, liobn); 485 spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0, 486 pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT); 487 dev->tcet->vdev = dev; 488 memory_region_add_subregion_overlap(&dev->mrroot, 0, 489 spapr_tce_get_iommu(dev->tcet), 2); 490 } 491 492 pc->realize(dev, errp); 493 } 494 495 static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPRMachineState *spapr, 496 target_ulong opcode, 497 target_ulong *args) 498 { 499 target_ulong reg = args[0]; 500 target_ulong mode = args[1]; 501 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 502 VIOsPAPRDeviceClass *pc; 503 504 if (!dev) { 505 return H_PARAMETER; 506 } 507 508 pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 509 510 if (mode & ~pc->signal_mask) { 511 return H_PARAMETER; 512 } 513 514 dev->signal_state = mode; 515 516 return H_SUCCESS; 517 } 518 519 VIOsPAPRBus *spapr_vio_bus_init(void) 520 { 521 VIOsPAPRBus *bus; 522 BusState *qbus; 523 DeviceState *dev; 524 525 /* Create bridge device */ 526 dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE); 527 qdev_init_nofail(dev); 528 529 /* Create bus on bridge device */ 530 qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio"); 531 bus = SPAPR_VIO_BUS(qbus); 532 bus->next_reg = 0x71000000; 533 534 /* hcall-vio */ 535 spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal); 536 537 /* hcall-crq */ 538 spapr_register_hypercall(H_REG_CRQ, h_reg_crq); 539 spapr_register_hypercall(H_FREE_CRQ, h_free_crq); 540 spapr_register_hypercall(H_SEND_CRQ, h_send_crq); 541 spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq); 542 543 /* RTAS calls */ 544 spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass", 545 rtas_set_tce_bypass); 546 spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce); 547 548 return bus; 549 } 550 551 /* Represents sPAPR hcall VIO devices */ 552 553 static int spapr_vio_bridge_init(SysBusDevice *dev) 554 { 555 /* nothing */ 556 return 0; 557 } 558 559 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) 560 { 561 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 562 DeviceClass *dc = DEVICE_CLASS(klass); 563 564 dc->fw_name = "vdevice"; 565 k->init = spapr_vio_bridge_init; 566 } 567 568 static const TypeInfo spapr_vio_bridge_info = { 569 .name = TYPE_SPAPR_VIO_BRIDGE, 570 .parent = TYPE_SYS_BUS_DEVICE, 571 .class_init = spapr_vio_bridge_class_init, 572 }; 573 574 const VMStateDescription vmstate_spapr_vio = { 575 .name = "spapr_vio", 576 .version_id = 1, 577 .minimum_version_id = 1, 578 .fields = (VMStateField[]) { 579 /* Sanity check */ 580 VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice), 581 VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice), 582 583 /* General VIO device state */ 584 VMSTATE_UINT64(signal_state, VIOsPAPRDevice), 585 VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice), 586 VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice), 587 VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice), 588 589 VMSTATE_END_OF_LIST() 590 }, 591 }; 592 593 static void vio_spapr_device_class_init(ObjectClass *klass, void *data) 594 { 595 DeviceClass *k = DEVICE_CLASS(klass); 596 k->realize = spapr_vio_busdev_realize; 597 k->reset = spapr_vio_busdev_reset; 598 k->bus_type = TYPE_SPAPR_VIO_BUS; 599 k->props = spapr_vio_props; 600 } 601 602 static const TypeInfo spapr_vio_type_info = { 603 .name = TYPE_VIO_SPAPR_DEVICE, 604 .parent = TYPE_DEVICE, 605 .instance_size = sizeof(VIOsPAPRDevice), 606 .abstract = true, 607 .class_size = sizeof(VIOsPAPRDeviceClass), 608 .class_init = vio_spapr_device_class_init, 609 }; 610 611 static void spapr_vio_register_types(void) 612 { 613 type_register_static(&spapr_vio_bus_info); 614 type_register_static(&spapr_vio_bridge_info); 615 type_register_static(&spapr_vio_type_info); 616 } 617 618 type_init(spapr_vio_register_types) 619 620 static int compare_reg(const void *p1, const void *p2) 621 { 622 VIOsPAPRDevice const *dev1, *dev2; 623 624 dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1; 625 dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2; 626 627 if (dev1->reg < dev2->reg) { 628 return -1; 629 } 630 if (dev1->reg == dev2->reg) { 631 return 0; 632 } 633 634 /* dev1->reg > dev2->reg */ 635 return 1; 636 } 637 638 int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt) 639 { 640 DeviceState *qdev, **qdevs; 641 BusChild *kid; 642 int i, num, ret = 0; 643 644 /* Count qdevs on the bus list */ 645 num = 0; 646 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 647 num++; 648 } 649 650 /* Copy out into an array of pointers */ 651 qdevs = g_malloc(sizeof(qdev) * num); 652 num = 0; 653 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 654 qdevs[num++] = kid->child; 655 } 656 657 /* Sort the array */ 658 qsort(qdevs, num, sizeof(qdev), compare_reg); 659 660 /* Hack alert. Give the devices to libfdt in reverse order, we happen 661 * to know that will mean they are in forward order in the tree. */ 662 for (i = num - 1; i >= 0; i--) { 663 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]); 664 665 ret = vio_make_devnode(dev, fdt); 666 667 if (ret < 0) { 668 goto out; 669 } 670 } 671 672 ret = 0; 673 out: 674 g_free(qdevs); 675 676 return ret; 677 } 678 679 int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus) 680 { 681 VIOsPAPRDevice *dev; 682 char *name, *path; 683 int ret, offset; 684 685 dev = spapr_vty_get_default(bus); 686 if (!dev) 687 return 0; 688 689 offset = fdt_path_offset(fdt, "/chosen"); 690 if (offset < 0) { 691 return offset; 692 } 693 694 name = spapr_vio_get_dev_name(DEVICE(dev)); 695 path = g_strdup_printf("/vdevice/%s", name); 696 697 ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path); 698 699 g_free(name); 700 g_free(path); 701 702 return ret; 703 } 704