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 "qapi/error.h" 24 #include "hw/hw.h" 25 #include "sysemu/sysemu.h" 26 #include "hw/boards.h" 27 #include "hw/loader.h" 28 #include "elf.h" 29 #include "hw/sysbus.h" 30 #include "sysemu/kvm.h" 31 #include "sysemu/device_tree.h" 32 #include "kvm_ppc.h" 33 34 #include "hw/ppc/spapr.h" 35 #include "hw/ppc/spapr_vio.h" 36 #include "hw/ppc/xics.h" 37 38 #include <libfdt.h> 39 40 /* #define DEBUG_SPAPR */ 41 42 #ifdef DEBUG_SPAPR 43 #define DPRINTF(fmt, ...) \ 44 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) 45 #else 46 #define DPRINTF(fmt, ...) \ 47 do { } while (0) 48 #endif 49 50 static Property spapr_vio_props[] = { 51 DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \ 52 DEFINE_PROP_END_OF_LIST(), 53 }; 54 55 static char *spapr_vio_get_dev_name(DeviceState *qdev) 56 { 57 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 58 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 59 char *name; 60 61 /* Device tree style name device@reg */ 62 name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg); 63 64 return name; 65 } 66 67 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data) 68 { 69 BusClass *k = BUS_CLASS(klass); 70 71 k->get_dev_path = spapr_vio_get_dev_name; 72 k->get_fw_dev_path = spapr_vio_get_dev_name; 73 } 74 75 static const TypeInfo spapr_vio_bus_info = { 76 .name = TYPE_SPAPR_VIO_BUS, 77 .parent = TYPE_BUS, 78 .class_init = spapr_vio_bus_class_init, 79 .instance_size = sizeof(VIOsPAPRBus), 80 }; 81 82 VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg) 83 { 84 BusChild *kid; 85 VIOsPAPRDevice *dev = NULL; 86 87 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 88 dev = (VIOsPAPRDevice *)kid->child; 89 if (dev->reg == reg) { 90 return dev; 91 } 92 } 93 94 return NULL; 95 } 96 97 static int vio_make_devnode(VIOsPAPRDevice *dev, 98 void *fdt) 99 { 100 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 101 int vdevice_off, node_off, ret; 102 char *dt_name; 103 104 vdevice_off = fdt_path_offset(fdt, "/vdevice"); 105 if (vdevice_off < 0) { 106 return vdevice_off; 107 } 108 109 dt_name = spapr_vio_get_dev_name(DEVICE(dev)); 110 node_off = fdt_add_subnode(fdt, vdevice_off, dt_name); 111 g_free(dt_name); 112 if (node_off < 0) { 113 return node_off; 114 } 115 116 ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg); 117 if (ret < 0) { 118 return ret; 119 } 120 121 if (pc->dt_type) { 122 ret = fdt_setprop_string(fdt, node_off, "device_type", 123 pc->dt_type); 124 if (ret < 0) { 125 return ret; 126 } 127 } 128 129 if (pc->dt_compatible) { 130 ret = fdt_setprop_string(fdt, node_off, "compatible", 131 pc->dt_compatible); 132 if (ret < 0) { 133 return ret; 134 } 135 } 136 137 if (dev->irq) { 138 uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0}; 139 140 ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop, 141 sizeof(ints_prop)); 142 if (ret < 0) { 143 return ret; 144 } 145 } 146 147 ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet); 148 if (ret < 0) { 149 return ret; 150 } 151 152 if (pc->devnode) { 153 ret = (pc->devnode)(dev, fdt, node_off); 154 if (ret < 0) { 155 return ret; 156 } 157 } 158 159 return node_off; 160 } 161 162 /* 163 * CRQ handling 164 */ 165 static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 166 target_ulong opcode, target_ulong *args) 167 { 168 target_ulong reg = args[0]; 169 target_ulong queue_addr = args[1]; 170 target_ulong queue_len = args[2]; 171 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 172 173 if (!dev) { 174 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 175 return H_PARAMETER; 176 } 177 178 /* We can't grok a queue size bigger than 256M for now */ 179 if (queue_len < 0x1000 || queue_len > 0x10000000) { 180 hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx 181 ")\n", queue_len); 182 return H_PARAMETER; 183 } 184 185 /* Check queue alignment */ 186 if (queue_addr & 0xfff) { 187 hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr); 188 return H_PARAMETER; 189 } 190 191 /* Check if device supports CRQs */ 192 if (!dev->crq.SendFunc) { 193 hcall_dprintf("Device does not support CRQ\n"); 194 return H_NOT_FOUND; 195 } 196 197 /* Already a queue ? */ 198 if (dev->crq.qsize) { 199 hcall_dprintf("CRQ already registered\n"); 200 return H_RESOURCE; 201 } 202 dev->crq.qladdr = queue_addr; 203 dev->crq.qsize = queue_len; 204 dev->crq.qnext = 0; 205 206 DPRINTF("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x" 207 TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n", 208 reg, queue_addr, queue_len); 209 return H_SUCCESS; 210 } 211 212 static target_ulong free_crq(VIOsPAPRDevice *dev) 213 { 214 dev->crq.qladdr = 0; 215 dev->crq.qsize = 0; 216 dev->crq.qnext = 0; 217 218 DPRINTF("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg); 219 220 return H_SUCCESS; 221 } 222 223 static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 224 target_ulong opcode, target_ulong *args) 225 { 226 target_ulong reg = args[0]; 227 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 228 229 if (!dev) { 230 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 231 return H_PARAMETER; 232 } 233 234 return free_crq(dev); 235 } 236 237 static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 238 target_ulong opcode, target_ulong *args) 239 { 240 target_ulong reg = args[0]; 241 target_ulong msg_hi = args[1]; 242 target_ulong msg_lo = args[2]; 243 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 244 uint64_t crq_mangle[2]; 245 246 if (!dev) { 247 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 248 return H_PARAMETER; 249 } 250 crq_mangle[0] = cpu_to_be64(msg_hi); 251 crq_mangle[1] = cpu_to_be64(msg_lo); 252 253 if (dev->crq.SendFunc) { 254 return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle); 255 } 256 257 return H_HARDWARE; 258 } 259 260 static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr, 261 target_ulong opcode, target_ulong *args) 262 { 263 target_ulong reg = args[0]; 264 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 265 266 if (!dev) { 267 hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg); 268 return H_PARAMETER; 269 } 270 271 return 0; 272 } 273 274 /* Returns negative error, 0 success, or positive: queue full */ 275 int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq) 276 { 277 int rc; 278 uint8_t byte; 279 280 if (!dev->crq.qsize) { 281 fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n"); 282 return -1; 283 } 284 285 /* Maybe do a fast path for KVM just writing to the pages */ 286 rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1); 287 if (rc) { 288 return rc; 289 } 290 if (byte != 0) { 291 return 1; 292 } 293 294 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8, 295 &crq[8], 8); 296 if (rc) { 297 return rc; 298 } 299 300 kvmppc_eieio(); 301 302 rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8); 303 if (rc) { 304 return rc; 305 } 306 307 dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize; 308 309 if (dev->signal_state & 1) { 310 qemu_irq_pulse(spapr_vio_qirq(dev)); 311 } 312 313 return 0; 314 } 315 316 /* "quiesce" handling */ 317 318 static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev) 319 { 320 if (dev->tcet) { 321 device_reset(DEVICE(dev->tcet)); 322 } 323 free_crq(dev); 324 } 325 326 void spapr_vio_set_bypass(VIOsPAPRDevice *dev, bool bypass) 327 { 328 if (!dev->tcet) { 329 return; 330 } 331 332 memory_region_set_enabled(&dev->mrbypass, bypass); 333 memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass); 334 335 dev->tcet->bypass = bypass; 336 } 337 338 static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPRMachineState *spapr, 339 uint32_t token, 340 uint32_t nargs, target_ulong args, 341 uint32_t nret, target_ulong rets) 342 { 343 VIOsPAPRBus *bus = spapr->vio_bus; 344 VIOsPAPRDevice *dev; 345 uint32_t unit, enable; 346 347 if (nargs != 2) { 348 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 349 return; 350 } 351 unit = rtas_ld(args, 0); 352 enable = rtas_ld(args, 1); 353 dev = spapr_vio_find_by_reg(bus, unit); 354 if (!dev) { 355 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 356 return; 357 } 358 359 if (!dev->tcet) { 360 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 361 return; 362 } 363 364 spapr_vio_set_bypass(dev, !!enable); 365 366 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 367 } 368 369 static void rtas_quiesce(PowerPCCPU *cpu, sPAPRMachineState *spapr, 370 uint32_t token, 371 uint32_t nargs, target_ulong args, 372 uint32_t nret, target_ulong rets) 373 { 374 VIOsPAPRBus *bus = spapr->vio_bus; 375 BusChild *kid; 376 VIOsPAPRDevice *dev = NULL; 377 378 if (nargs != 0) { 379 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 380 return; 381 } 382 383 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 384 dev = (VIOsPAPRDevice *)kid->child; 385 spapr_vio_quiesce_one(dev); 386 } 387 388 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 389 } 390 391 static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev) 392 { 393 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); 394 BusChild *kid; 395 VIOsPAPRDevice *other; 396 397 /* 398 * Check for a device other than the given one which is already 399 * using the requested address. We have to open code this because 400 * the given dev might already be in the list. 401 */ 402 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 403 other = VIO_SPAPR_DEVICE(kid->child); 404 405 if (other != dev && other->reg == dev->reg) { 406 return other; 407 } 408 } 409 410 return 0; 411 } 412 413 static void spapr_vio_busdev_reset(DeviceState *qdev) 414 { 415 VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev); 416 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 417 418 /* Shut down the request queue and TCEs if necessary */ 419 spapr_vio_quiesce_one(dev); 420 421 dev->signal_state = 0; 422 423 spapr_vio_set_bypass(dev, false); 424 if (pc->reset) { 425 pc->reset(dev); 426 } 427 } 428 429 static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp) 430 { 431 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 432 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev; 433 VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 434 char *id; 435 Error *local_err = NULL; 436 437 if (dev->reg != -1) { 438 /* 439 * Explicitly assigned address, just verify that no-one else 440 * is using it. other mechanism). We have to open code this 441 * rather than using spapr_vio_find_by_reg() because sdev 442 * itself is already in the list. 443 */ 444 VIOsPAPRDevice *other = reg_conflict(dev); 445 446 if (other) { 447 error_setg(errp, "%s and %s devices conflict at address %#x", 448 object_get_typename(OBJECT(qdev)), 449 object_get_typename(OBJECT(&other->qdev)), 450 dev->reg); 451 return; 452 } 453 } else { 454 /* Need to assign an address */ 455 VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus); 456 457 do { 458 dev->reg = bus->next_reg++; 459 } while (reg_conflict(dev)); 460 } 461 462 /* Don't overwrite ids assigned on the command line */ 463 if (!dev->qdev.id) { 464 id = spapr_vio_get_dev_name(DEVICE(dev)); 465 dev->qdev.id = id; 466 } 467 468 dev->irq = xics_alloc(spapr->icp, 0, dev->irq, false, &local_err); 469 if (local_err) { 470 error_propagate(errp, local_err); 471 return; 472 } 473 474 if (pc->rtce_window_size) { 475 uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg); 476 477 memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root", 478 ram_size); 479 memory_region_init_alias(&dev->mrbypass, OBJECT(dev), 480 "iommu-spapr-bypass", get_system_memory(), 481 0, ram_size); 482 memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1); 483 address_space_init(&dev->as, &dev->mrroot, qdev->id); 484 485 dev->tcet = spapr_tce_new_table(qdev, liobn, 486 0, 487 SPAPR_TCE_PAGE_SHIFT, 488 pc->rtce_window_size >> 489 SPAPR_TCE_PAGE_SHIFT, false); 490 dev->tcet->vdev = dev; 491 memory_region_add_subregion_overlap(&dev->mrroot, 0, 492 spapr_tce_get_iommu(dev->tcet), 2); 493 } 494 495 pc->realize(dev, errp); 496 } 497 498 static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPRMachineState *spapr, 499 target_ulong opcode, 500 target_ulong *args) 501 { 502 target_ulong reg = args[0]; 503 target_ulong mode = args[1]; 504 VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 505 VIOsPAPRDeviceClass *pc; 506 507 if (!dev) { 508 return H_PARAMETER; 509 } 510 511 pc = VIO_SPAPR_DEVICE_GET_CLASS(dev); 512 513 if (mode & ~pc->signal_mask) { 514 return H_PARAMETER; 515 } 516 517 dev->signal_state = mode; 518 519 return H_SUCCESS; 520 } 521 522 VIOsPAPRBus *spapr_vio_bus_init(void) 523 { 524 VIOsPAPRBus *bus; 525 BusState *qbus; 526 DeviceState *dev; 527 528 /* Create bridge device */ 529 dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE); 530 qdev_init_nofail(dev); 531 532 /* Create bus on bridge device */ 533 qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio"); 534 bus = SPAPR_VIO_BUS(qbus); 535 bus->next_reg = 0x71000000; 536 537 /* hcall-vio */ 538 spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal); 539 540 /* hcall-crq */ 541 spapr_register_hypercall(H_REG_CRQ, h_reg_crq); 542 spapr_register_hypercall(H_FREE_CRQ, h_free_crq); 543 spapr_register_hypercall(H_SEND_CRQ, h_send_crq); 544 spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq); 545 546 /* RTAS calls */ 547 spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass", 548 rtas_set_tce_bypass); 549 spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce); 550 551 return bus; 552 } 553 554 /* Represents sPAPR hcall VIO devices */ 555 556 static int spapr_vio_bridge_init(SysBusDevice *dev) 557 { 558 /* nothing */ 559 return 0; 560 } 561 562 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data) 563 { 564 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 565 DeviceClass *dc = DEVICE_CLASS(klass); 566 567 dc->fw_name = "vdevice"; 568 k->init = spapr_vio_bridge_init; 569 } 570 571 static const TypeInfo spapr_vio_bridge_info = { 572 .name = TYPE_SPAPR_VIO_BRIDGE, 573 .parent = TYPE_SYS_BUS_DEVICE, 574 .class_init = spapr_vio_bridge_class_init, 575 }; 576 577 const VMStateDescription vmstate_spapr_vio = { 578 .name = "spapr_vio", 579 .version_id = 1, 580 .minimum_version_id = 1, 581 .fields = (VMStateField[]) { 582 /* Sanity check */ 583 VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice), 584 VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice), 585 586 /* General VIO device state */ 587 VMSTATE_UINT64(signal_state, VIOsPAPRDevice), 588 VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice), 589 VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice), 590 VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice), 591 592 VMSTATE_END_OF_LIST() 593 }, 594 }; 595 596 static void vio_spapr_device_class_init(ObjectClass *klass, void *data) 597 { 598 DeviceClass *k = DEVICE_CLASS(klass); 599 k->realize = spapr_vio_busdev_realize; 600 k->reset = spapr_vio_busdev_reset; 601 k->bus_type = TYPE_SPAPR_VIO_BUS; 602 k->props = spapr_vio_props; 603 } 604 605 static const TypeInfo spapr_vio_type_info = { 606 .name = TYPE_VIO_SPAPR_DEVICE, 607 .parent = TYPE_DEVICE, 608 .instance_size = sizeof(VIOsPAPRDevice), 609 .abstract = true, 610 .class_size = sizeof(VIOsPAPRDeviceClass), 611 .class_init = vio_spapr_device_class_init, 612 }; 613 614 static void spapr_vio_register_types(void) 615 { 616 type_register_static(&spapr_vio_bus_info); 617 type_register_static(&spapr_vio_bridge_info); 618 type_register_static(&spapr_vio_type_info); 619 } 620 621 type_init(spapr_vio_register_types) 622 623 static int compare_reg(const void *p1, const void *p2) 624 { 625 VIOsPAPRDevice const *dev1, *dev2; 626 627 dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1; 628 dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2; 629 630 if (dev1->reg < dev2->reg) { 631 return -1; 632 } 633 if (dev1->reg == dev2->reg) { 634 return 0; 635 } 636 637 /* dev1->reg > dev2->reg */ 638 return 1; 639 } 640 641 int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt) 642 { 643 DeviceState *qdev, **qdevs; 644 BusChild *kid; 645 int i, num, ret = 0; 646 647 /* Count qdevs on the bus list */ 648 num = 0; 649 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 650 num++; 651 } 652 653 /* Copy out into an array of pointers */ 654 qdevs = g_malloc(sizeof(qdev) * num); 655 num = 0; 656 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 657 qdevs[num++] = kid->child; 658 } 659 660 /* Sort the array */ 661 qsort(qdevs, num, sizeof(qdev), compare_reg); 662 663 /* Hack alert. Give the devices to libfdt in reverse order, we happen 664 * to know that will mean they are in forward order in the tree. */ 665 for (i = num - 1; i >= 0; i--) { 666 VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]); 667 668 ret = vio_make_devnode(dev, fdt); 669 670 if (ret < 0) { 671 goto out; 672 } 673 } 674 675 ret = 0; 676 out: 677 g_free(qdevs); 678 679 return ret; 680 } 681 682 int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus) 683 { 684 VIOsPAPRDevice *dev; 685 char *name, *path; 686 int ret, offset; 687 688 dev = spapr_vty_get_default(bus); 689 if (!dev) 690 return 0; 691 692 offset = fdt_path_offset(fdt, "/chosen"); 693 if (offset < 0) { 694 return offset; 695 } 696 697 name = spapr_vio_get_dev_name(DEVICE(dev)); 698 path = g_strdup_printf("/vdevice/%s", name); 699 700 ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path); 701 702 g_free(name); 703 g_free(path); 704 705 return ret; 706 } 707