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 "qapi/visitor.h"
  26 #include "hw/irq.h"
  27 #include "qemu/log.h"
  28 #include "sysemu/sysemu.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 #include "migration/vmstate.h"
  36 #include "sysemu/qtest.h"
  37
  38 #include "hw/ppc/spapr.h"
  39 #include "hw/ppc/spapr_vio.h"
  40 #include "hw/ppc/fdt.h"
  41 #include "trace.h"
  42
  43 #include <libfdt.h>
  44
  45 #define SPAPR_VIO_REG_BASE 0x71000000
  46
  47 static char *spapr_vio_get_dev_name(DeviceState *qdev)
  48 {
  49     SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
  50     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
  51
  52     /* Device tree style name device@reg */
  53     return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
  54 }
  55
  56 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
  57 {
  58     BusClass *k = BUS_CLASS(klass);
  59
  60     k->get_dev_path = spapr_vio_get_dev_name;
  61     k->get_fw_dev_path = spapr_vio_get_dev_name;
  62 }
  63
  64 static const TypeInfo spapr_vio_bus_info = {
  65     .name = TYPE_SPAPR_VIO_BUS,
  66     .parent = TYPE_BUS,
  67     .class_init = spapr_vio_bus_class_init,
  68     .instance_size = sizeof(SpaprVioBus),
  69 };
  70
  71 SpaprVioDevice *spapr_vio_find_by_reg(SpaprVioBus *bus, uint32_t reg)
  72 {
  73     BusChild *kid;
  74     SpaprVioDevice *dev = NULL;
  75
  76     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
  77         dev = (SpaprVioDevice *)kid->child;
  78         if (dev->reg == reg) {
  79             return dev;
  80         }
  81     }
  82
  83     return NULL;
  84 }
  85
  86 static int vio_make_devnode(SpaprVioDevice *dev,
  87                             void *fdt)
  88 {
  89     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
  90     int vdevice_off, node_off, ret;
  91     char *dt_name;
  92
  93     vdevice_off = fdt_path_offset(fdt, "/vdevice");
  94     if (vdevice_off < 0) {
  95         return vdevice_off;
  96     }
  97
  98     dt_name = spapr_vio_get_dev_name(DEVICE(dev));
  99     node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
 100     g_free(dt_name);
 101     if (node_off < 0) {
 102         return node_off;
 103     }
 104
 105     ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
 106     if (ret < 0) {
 107         return ret;
 108     }
 109
 110     if (pc->dt_type) {
 111         ret = fdt_setprop_string(fdt, node_off, "device_type",
 112                                  pc->dt_type);
 113         if (ret < 0) {
 114             return ret;
 115         }
 116     }
 117
 118     if (pc->dt_compatible) {
 119         ret = fdt_setprop_string(fdt, node_off, "compatible",
 120                                  pc->dt_compatible);
 121         if (ret < 0) {
 122             return ret;
 123         }
 124     }
 125
 126     if (dev->irq) {
 127         uint32_t ints_prop[2];
 128
 129         spapr_dt_irq(ints_prop, dev->irq, false);
 130         ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
 131                           sizeof(ints_prop));
 132         if (ret < 0) {
 133             return ret;
 134         }
 135     }
 136
 137     ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
 138     if (ret < 0) {
 139         return ret;
 140     }
 141
 142     if (pc->devnode) {
 143         ret = (pc->devnode)(dev, fdt, node_off);
 144         if (ret < 0) {
 145             return ret;
 146         }
 147     }
 148
 149     return node_off;
 150 }
 151
 152 /*
 153  * CRQ handling
 154  */
 155 static target_ulong h_reg_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 156                               target_ulong opcode, target_ulong *args)
 157 {
 158     target_ulong reg = args[0];
 159     target_ulong queue_addr = args[1];
 160     target_ulong queue_len = args[2];
 161     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 162
 163     if (!dev) {
 164         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 165         return H_PARAMETER;
 166     }
 167
 168     /* We can't grok a queue size bigger than 256M for now */
 169     if (queue_len < 0x1000 || queue_len > 0x10000000) {
 170         hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
 171                       ")\n", queue_len);
 172         return H_PARAMETER;
 173     }
 174
 175     /* Check queue alignment */
 176     if (queue_addr & 0xfff) {
 177         hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
 178         return H_PARAMETER;
 179     }
 180
 181     /* Check if device supports CRQs */
 182     if (!dev->crq.SendFunc) {
 183         hcall_dprintf("Device does not support CRQ\n");
 184         return H_NOT_FOUND;
 185     }
 186
 187     /* Already a queue ? */
 188     if (dev->crq.qsize) {
 189         hcall_dprintf("CRQ already registered\n");
 190         return H_RESOURCE;
 191     }
 192     dev->crq.qladdr = queue_addr;
 193     dev->crq.qsize = queue_len;
 194     dev->crq.qnext = 0;
 195
 196     trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len);
 197     return H_SUCCESS;
 198 }
 199
 200 static target_ulong free_crq(SpaprVioDevice *dev)
 201 {
 202     dev->crq.qladdr = 0;
 203     dev->crq.qsize = 0;
 204     dev->crq.qnext = 0;
 205
 206     trace_spapr_vio_free_crq(dev->reg);
 207
 208     return H_SUCCESS;
 209 }
 210
 211 static target_ulong h_free_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 212                                target_ulong opcode, target_ulong *args)
 213 {
 214     target_ulong reg = args[0];
 215     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 216
 217     if (!dev) {
 218         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 219         return H_PARAMETER;
 220     }
 221
 222     return free_crq(dev);
 223 }
 224
 225 static target_ulong h_send_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 226                                target_ulong opcode, target_ulong *args)
 227 {
 228     target_ulong reg = args[0];
 229     target_ulong msg_hi = args[1];
 230     target_ulong msg_lo = args[2];
 231     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 232     uint64_t crq_mangle[2];
 233
 234     if (!dev) {
 235         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 236         return H_PARAMETER;
 237     }
 238     crq_mangle[0] = cpu_to_be64(msg_hi);
 239     crq_mangle[1] = cpu_to_be64(msg_lo);
 240
 241     if (dev->crq.SendFunc) {
 242         return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
 243     }
 244
 245     return H_HARDWARE;
 246 }
 247
 248 static target_ulong h_enable_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 249                                  target_ulong opcode, target_ulong *args)
 250 {
 251     target_ulong reg = args[0];
 252     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 253
 254     if (!dev) {
 255         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 256         return H_PARAMETER;
 257     }
 258
 259     return 0;
 260 }
 261
 262 /* Returns negative error, 0 success, or positive: queue full */
 263 int spapr_vio_send_crq(SpaprVioDevice *dev, uint8_t *crq)
 264 {
 265     int rc;
 266     uint8_t byte;
 267
 268     if (!dev->crq.qsize) {
 269         error_report("spapr_vio_send_creq on uninitialized queue");
 270         return -1;
 271     }
 272
 273     /* Maybe do a fast path for KVM just writing to the pages */
 274     rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
 275     if (rc) {
 276         return rc;
 277     }
 278     if (byte != 0) {
 279         return 1;
 280     }
 281
 282     rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
 283                              &crq[8], 8);
 284     if (rc) {
 285         return rc;
 286     }
 287
 288     kvmppc_eieio();
 289
 290     rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
 291     if (rc) {
 292         return rc;
 293     }
 294
 295     dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
 296
 297     if (dev->signal_state & 1) {
 298         qemu_irq_pulse(spapr_vio_qirq(dev));
 299     }
 300
 301     return 0;
 302 }
 303
 304 /* "quiesce" handling */
 305
 306 static void spapr_vio_quiesce_one(SpaprVioDevice *dev)
 307 {
 308     if (dev->tcet) {
 309         device_reset(DEVICE(dev->tcet));
 310     }
 311     free_crq(dev);
 312 }
 313
 314 void spapr_vio_set_bypass(SpaprVioDevice *dev, bool bypass)
 315 {
 316     if (!dev->tcet) {
 317         return;
 318     }
 319
 320     memory_region_set_enabled(&dev->mrbypass, bypass);
 321     memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass);
 322
 323     dev->tcet->bypass = bypass;
 324 }
 325
 326 static void rtas_set_tce_bypass(PowerPCCPU *cpu, SpaprMachineState *spapr,
 327                                 uint32_t token,
 328                                 uint32_t nargs, target_ulong args,
 329                                 uint32_t nret, target_ulong rets)
 330 {
 331     SpaprVioBus *bus = spapr->vio_bus;
 332     SpaprVioDevice *dev;
 333     uint32_t unit, enable;
 334
 335     if (nargs != 2) {
 336         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 337         return;
 338     }
 339     unit = rtas_ld(args, 0);
 340     enable = rtas_ld(args, 1);
 341     dev = spapr_vio_find_by_reg(bus, unit);
 342     if (!dev) {
 343         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 344         return;
 345     }
 346
 347     if (!dev->tcet) {
 348         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 349         return;
 350     }
 351
 352     spapr_vio_set_bypass(dev, !!enable);
 353
 354     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 355 }
 356
 357 static void rtas_quiesce(PowerPCCPU *cpu, SpaprMachineState *spapr,
 358                          uint32_t token,
 359                          uint32_t nargs, target_ulong args,
 360                          uint32_t nret, target_ulong rets)
 361 {
 362     SpaprVioBus *bus = spapr->vio_bus;
 363     BusChild *kid;
 364     SpaprVioDevice *dev = NULL;
 365
 366     if (nargs != 0) {
 367         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 368         return;
 369     }
 370
 371     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 372         dev = (SpaprVioDevice *)kid->child;
 373         spapr_vio_quiesce_one(dev);
 374     }
 375
 376     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 377 }
 378
 379 static SpaprVioDevice *reg_conflict(SpaprVioDevice *dev)
 380 {
 381     SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
 382     BusChild *kid;
 383     SpaprVioDevice *other;
 384
 385     /*
 386      * Check for a device other than the given one which is already
 387      * using the requested address. We have to open code this because
 388      * the given dev might already be in the list.
 389      */
 390     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 391         other = VIO_SPAPR_DEVICE(kid->child);
 392
 393         if (other != dev && other->reg == dev->reg) {
 394             return other;
 395         }
 396     }
 397
 398     return 0;
 399 }
 400
 401 static void spapr_vio_busdev_reset(DeviceState *qdev)
 402 {
 403     SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
 404     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 405
 406     /* Shut down the request queue and TCEs if necessary */
 407     spapr_vio_quiesce_one(dev);
 408
 409     dev->signal_state = 0;
 410
 411     spapr_vio_set_bypass(dev, false);
 412     if (pc->reset) {
 413         pc->reset(dev);
 414     }
 415 }
 416
 417 /*
 418  * The register property of a VIO device is defined in livirt using
 419  * 0x1000 as a base register number plus a 0x1000 increment. For the
 420  * VIO tty device, the base number is changed to 0x30000000. QEMU uses
 421  * a base register number of 0x71000000 and then a simple increment.
 422  *
 423  * The formula below tries to compute a unique index number from the
 424  * register value that will be used to define the IRQ number of the
 425  * VIO device.
 426  *
 427  * A maximum of 256 VIO devices is covered. Collisions are possible
 428  * but they will be detected when the IRQ is claimed.
 429  */
 430 static inline uint32_t spapr_vio_reg_to_irq(uint32_t reg)
 431 {
 432     uint32_t irq;
 433
 434     if (reg >= SPAPR_VIO_REG_BASE) {
 435         /*
 436          * VIO device register values when allocated by QEMU. For
 437          * these, we simply mask the high bits to fit the overall
 438          * range: [0x00 - 0xff].
 439          *
 440          * The nvram VIO device (reg=0x71000000) is a static device of
 441          * the pseries machine and so is always allocated by QEMU. Its
 442          * IRQ number is 0x0.
 443          */
 444         irq = reg & 0xff;
 445
 446     } else if (reg >= 0x30000000) {
 447         /*
 448          * VIO tty devices register values, when allocated by livirt,
 449          * are mapped in range [0xf0 - 0xff], gives us a maximum of 16
 450          * vtys.
 451          */
 452         irq = 0xf0 | ((reg >> 12) & 0xf);
 453
 454     } else {
 455         /*
 456          * Other VIO devices register values, when allocated by
 457          * livirt, should be mapped in range [0x00 - 0xef]. Conflicts
 458          * will be detected when IRQ is claimed.
 459          */
 460         irq = (reg >> 12) & 0xff;
 461     }
 462
 463     return SPAPR_IRQ_VIO | irq;
 464 }
 465
 466 static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
 467 {
 468     SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 469     SpaprVioDevice *dev = (SpaprVioDevice *)qdev;
 470     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 471     char *id;
 472     Error *local_err = NULL;
 473
 474     if (dev->reg != -1) {
 475         /*
 476          * Explicitly assigned address, just verify that no-one else
 477          * is using it.  other mechanism). We have to open code this
 478          * rather than using spapr_vio_find_by_reg() because sdev
 479          * itself is already in the list.
 480          */
 481         SpaprVioDevice *other = reg_conflict(dev);
 482
 483         if (other) {
 484             error_setg(errp, "%s and %s devices conflict at address %#x",
 485                        object_get_typename(OBJECT(qdev)),
 486                        object_get_typename(OBJECT(&other->qdev)),
 487                        dev->reg);
 488             return;
 489         }
 490     } else {
 491         /* Need to assign an address */
 492         SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
 493
 494         do {
 495             dev->reg = bus->next_reg++;
 496         } while (reg_conflict(dev));
 497     }
 498
 499     /* Don't overwrite ids assigned on the command line */
 500     if (!dev->qdev.id) {
 501         id = spapr_vio_get_dev_name(DEVICE(dev));
 502         dev->qdev.id = id;
 503     }
 504
 505     dev->irq = spapr_vio_reg_to_irq(dev->reg);
 506
 507     if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
 508         dev->irq = spapr_irq_findone(spapr, &local_err);
 509         if (local_err) {
 510             error_propagate(errp, local_err);
 511             return;
 512         }
 513     }
 514
 515     spapr_irq_claim(spapr, dev->irq, false, &local_err);
 516     if (local_err) {
 517         error_propagate(errp, local_err);
 518         return;
 519     }
 520
 521     if (pc->rtce_window_size) {
 522         uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
 523
 524         memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
 525                            ram_size);
 526         memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
 527                                  "iommu-spapr-bypass", get_system_memory(),
 528                                  0, ram_size);
 529         memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1);
 530         address_space_init(&dev->as, &dev->mrroot, qdev->id);
 531
 532         dev->tcet = spapr_tce_new_table(qdev, liobn);
 533         spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0,
 534                                pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT);
 535         dev->tcet->vdev = dev;
 536         memory_region_add_subregion_overlap(&dev->mrroot, 0,
 537                                             spapr_tce_get_iommu(dev->tcet), 2);
 538     }
 539
 540     pc->realize(dev, errp);
 541 }
 542
 543 static target_ulong h_vio_signal(PowerPCCPU *cpu, SpaprMachineState *spapr,
 544                                  target_ulong opcode,
 545                                  target_ulong *args)
 546 {
 547     target_ulong reg = args[0];
 548     target_ulong mode = args[1];
 549     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 550     SpaprVioDeviceClass *pc;
 551
 552     if (!dev) {
 553         return H_PARAMETER;
 554     }
 555
 556     pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 557
 558     if (mode & ~pc->signal_mask) {
 559         return H_PARAMETER;
 560     }
 561
 562     dev->signal_state = mode;
 563
 564     return H_SUCCESS;
 565 }
 566
 567 SpaprVioBus *spapr_vio_bus_init(void)
 568 {
 569     SpaprVioBus *bus;
 570     BusState *qbus;
 571     DeviceState *dev;
 572
 573     /* Create bridge device */
 574     dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE);
 575     qdev_init_nofail(dev);
 576
 577     /* Create bus on bridge device */
 578     qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
 579     bus = SPAPR_VIO_BUS(qbus);
 580     bus->next_reg = SPAPR_VIO_REG_BASE;
 581
 582     /* hcall-vio */
 583     spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
 584
 585     /* hcall-crq */
 586     spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
 587     spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
 588     spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
 589     spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
 590
 591     /* RTAS calls */
 592     spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
 593                         rtas_set_tce_bypass);
 594     spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce);
 595
 596     return bus;
 597 }
 598
 599 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
 600 {
 601     DeviceClass *dc = DEVICE_CLASS(klass);
 602
 603     dc->fw_name = "vdevice";
 604 }
 605
 606 static const TypeInfo spapr_vio_bridge_info = {
 607     .name          = TYPE_SPAPR_VIO_BRIDGE,
 608     .parent        = TYPE_SYS_BUS_DEVICE,
 609     .class_init    = spapr_vio_bridge_class_init,
 610 };
 611
 612 const VMStateDescription vmstate_spapr_vio = {
 613     .name = "spapr_vio",
 614     .version_id = 1,
 615     .minimum_version_id = 1,
 616     .fields = (VMStateField[]) {
 617         /* Sanity check */
 618         VMSTATE_UINT32_EQUAL(reg, SpaprVioDevice, NULL),
 619         VMSTATE_UINT32_EQUAL(irq, SpaprVioDevice, NULL),
 620
 621         /* General VIO device state */
 622         VMSTATE_UINT64(signal_state, SpaprVioDevice),
 623         VMSTATE_UINT64(crq.qladdr, SpaprVioDevice),
 624         VMSTATE_UINT32(crq.qsize, SpaprVioDevice),
 625         VMSTATE_UINT32(crq.qnext, SpaprVioDevice),
 626
 627         VMSTATE_END_OF_LIST()
 628     },
 629 };
 630
 631 static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
 632 {
 633     DeviceClass *k = DEVICE_CLASS(klass);
 634     k->realize = spapr_vio_busdev_realize;
 635     k->reset = spapr_vio_busdev_reset;
 636     k->bus_type = TYPE_SPAPR_VIO_BUS;
 637 }
 638
 639 static const TypeInfo spapr_vio_type_info = {
 640     .name = TYPE_VIO_SPAPR_DEVICE,
 641     .parent = TYPE_DEVICE,
 642     .instance_size = sizeof(SpaprVioDevice),
 643     .abstract = true,
 644     .class_size = sizeof(SpaprVioDeviceClass),
 645     .class_init = vio_spapr_device_class_init,
 646 };
 647
 648 static void spapr_vio_register_types(void)
 649 {
 650     type_register_static(&spapr_vio_bus_info);
 651     type_register_static(&spapr_vio_bridge_info);
 652     type_register_static(&spapr_vio_type_info);
 653 }
 654
 655 type_init(spapr_vio_register_types)
 656
 657 static int compare_reg(const void *p1, const void *p2)
 658 {
 659     SpaprVioDevice const *dev1, *dev2;
 660
 661     dev1 = (SpaprVioDevice *)*(DeviceState **)p1;
 662     dev2 = (SpaprVioDevice *)*(DeviceState **)p2;
 663
 664     if (dev1->reg < dev2->reg) {
 665         return -1;
 666     }
 667     if (dev1->reg == dev2->reg) {
 668         return 0;
 669     }
 670
 671     /* dev1->reg > dev2->reg */
 672     return 1;
 673 }
 674
 675 void spapr_dt_vdevice(SpaprVioBus *bus, void *fdt)
 676 {
 677     DeviceState *qdev, **qdevs;
 678     BusChild *kid;
 679     int i, num, ret = 0;
 680     int node;
 681
 682     _FDT(node = fdt_add_subnode(fdt, 0, "vdevice"));
 683
 684     _FDT(fdt_setprop_string(fdt, node, "device_type", "vdevice"));
 685     _FDT(fdt_setprop_string(fdt, node, "compatible", "IBM,vdevice"));
 686     _FDT(fdt_setprop_cell(fdt, node, "#address-cells", 1));
 687     _FDT(fdt_setprop_cell(fdt, node, "#size-cells", 0));
 688     _FDT(fdt_setprop_cell(fdt, node, "#interrupt-cells", 2));
 689     _FDT(fdt_setprop(fdt, node, "interrupt-controller", NULL, 0));
 690
 691     /* Count qdevs on the bus list */
 692     num = 0;
 693     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 694         num++;
 695     }
 696
 697     /* Copy out into an array of pointers */
 698     qdevs = g_new(DeviceState *, num);
 699     num = 0;
 700     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 701         qdevs[num++] = kid->child;
 702     }
 703
 704     /* Sort the array */
 705     qsort(qdevs, num, sizeof(qdev), compare_reg);
 706
 707     /* Hack alert. Give the devices to libfdt in reverse order, we happen
 708      * to know that will mean they are in forward order in the tree. */
 709     for (i = num - 1; i >= 0; i--) {
 710         SpaprVioDevice *dev = (SpaprVioDevice *)(qdevs[i]);
 711         SpaprVioDeviceClass *vdc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 712
 713         ret = vio_make_devnode(dev, fdt);
 714         if (ret < 0) {
 715             error_report("Couldn't create device node /vdevice/%s@%"PRIx32,
 716                          vdc->dt_name, dev->reg);
 717             exit(1);
 718         }
 719     }
 720
 721     g_free(qdevs);
 722 }
 723
 724 gchar *spapr_vio_stdout_path(SpaprVioBus *bus)
 725 {
 726     SpaprVioDevice *dev;
 727     char *name, *path;
 728
 729     dev = spapr_vty_get_default(bus);
 730     if (!dev) {
 731         return NULL;
 732     }
 733
 734     name = spapr_vio_get_dev_name(DEVICE(dev));
 735     path = g_strdup_printf("/vdevice/%s", name);
 736
 737     g_free(name);
 738     return path;
 739 }