hw/ppc/spapr_vio.c

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