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 2.1 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 "qemu/log.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 #include "migration/vmstate.h"
  34
  35 #include "hw/ppc/spapr.h"
  36 #include "hw/ppc/spapr_vio.h"
  37 #include "hw/ppc/fdt.h"
  38 #include "trace.h"
  39
  40 #include <libfdt.h>
  41
  42 #define SPAPR_VIO_REG_BASE 0x71000000
  43
  44 static char *spapr_vio_get_dev_name(DeviceState *qdev)
  45 {
  46     SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
  47     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
  48
  49     /* Device tree style name device@reg */
  50     return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
  51 }
  52
  53 static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
  54 {
  55     BusClass *k = BUS_CLASS(klass);
  56
  57     k->get_dev_path = spapr_vio_get_dev_name;
  58     k->get_fw_dev_path = spapr_vio_get_dev_name;
  59 }
  60
  61 static const TypeInfo spapr_vio_bus_info = {
  62     .name = TYPE_SPAPR_VIO_BUS,
  63     .parent = TYPE_BUS,
  64     .class_init = spapr_vio_bus_class_init,
  65     .instance_size = sizeof(SpaprVioBus),
  66 };
  67
  68 SpaprVioDevice *spapr_vio_find_by_reg(SpaprVioBus *bus, uint32_t reg)
  69 {
  70     BusChild *kid;
  71     SpaprVioDevice *dev = NULL;
  72
  73     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
  74         dev = (SpaprVioDevice *)kid->child;
  75         if (dev->reg == reg) {
  76             return dev;
  77         }
  78     }
  79
  80     return NULL;
  81 }
  82
  83 static int vio_make_devnode(SpaprVioDevice *dev,
  84                             void *fdt)
  85 {
  86     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
  87     int vdevice_off, node_off, ret;
  88     char *dt_name;
  89     const char *dt_compatible;
  90
  91     vdevice_off = fdt_path_offset(fdt, "/vdevice");
  92     if (vdevice_off < 0) {
  93         return vdevice_off;
  94     }
  95
  96     dt_name = spapr_vio_get_dev_name(DEVICE(dev));
  97     node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
  98     g_free(dt_name);
  99     if (node_off < 0) {
 100         return node_off;
 101     }
 102
 103     ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
 104     if (ret < 0) {
 105         return ret;
 106     }
 107
 108     if (pc->dt_type) {
 109         ret = fdt_setprop_string(fdt, node_off, "device_type",
 110                                  pc->dt_type);
 111         if (ret < 0) {
 112             return ret;
 113         }
 114     }
 115
 116     if (pc->get_dt_compatible) {
 117         dt_compatible = pc->get_dt_compatible(dev);
 118     } else {
 119         dt_compatible = pc->dt_compatible;
 120     }
 121
 122     if (dt_compatible) {
 123         ret = fdt_setprop_string(fdt, node_off, "compatible",
 124                                  dt_compatible);
 125         if (ret < 0) {
 126             return ret;
 127         }
 128     }
 129
 130     if (dev->irq) {
 131         uint32_t ints_prop[2];
 132
 133         spapr_dt_irq(ints_prop, dev->irq, false);
 134         ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
 135                           sizeof(ints_prop));
 136         if (ret < 0) {
 137             return ret;
 138         }
 139     }
 140
 141     ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
 142     if (ret < 0) {
 143         return ret;
 144     }
 145
 146     if (pc->devnode) {
 147         ret = (pc->devnode)(dev, fdt, node_off);
 148         if (ret < 0) {
 149             return ret;
 150         }
 151     }
 152
 153     return node_off;
 154 }
 155
 156 /*
 157  * CRQ handling
 158  */
 159 static target_ulong h_reg_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 160                               target_ulong opcode, target_ulong *args)
 161 {
 162     target_ulong reg = args[0];
 163     target_ulong queue_addr = args[1];
 164     target_ulong queue_len = args[2];
 165     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 166
 167     if (!dev) {
 168         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 169         return H_PARAMETER;
 170     }
 171
 172     /* We can't grok a queue size bigger than 256M for now */
 173     if (queue_len < 0x1000 || queue_len > 0x10000000) {
 174         hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
 175                       ")\n", queue_len);
 176         return H_PARAMETER;
 177     }
 178
 179     /* Check queue alignment */
 180     if (queue_addr & 0xfff) {
 181         hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
 182         return H_PARAMETER;
 183     }
 184
 185     /* Check if device supports CRQs */
 186     if (!dev->crq.SendFunc) {
 187         hcall_dprintf("Device does not support CRQ\n");
 188         return H_NOT_FOUND;
 189     }
 190
 191     /* Already a queue ? */
 192     if (dev->crq.qsize) {
 193         hcall_dprintf("CRQ already registered\n");
 194         return H_RESOURCE;
 195     }
 196     dev->crq.qladdr = queue_addr;
 197     dev->crq.qsize = queue_len;
 198     dev->crq.qnext = 0;
 199
 200     trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len);
 201     return H_SUCCESS;
 202 }
 203
 204 static target_ulong free_crq(SpaprVioDevice *dev)
 205 {
 206     dev->crq.qladdr = 0;
 207     dev->crq.qsize = 0;
 208     dev->crq.qnext = 0;
 209
 210     trace_spapr_vio_free_crq(dev->reg);
 211
 212     return H_SUCCESS;
 213 }
 214
 215 static target_ulong h_free_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 216                                target_ulong opcode, target_ulong *args)
 217 {
 218     target_ulong reg = args[0];
 219     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 220
 221     if (!dev) {
 222         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 223         return H_PARAMETER;
 224     }
 225
 226     return free_crq(dev);
 227 }
 228
 229 static target_ulong h_send_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 230                                target_ulong opcode, target_ulong *args)
 231 {
 232     target_ulong reg = args[0];
 233     target_ulong msg_hi = args[1];
 234     target_ulong msg_lo = args[2];
 235     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 236     uint64_t crq_mangle[2];
 237
 238     if (!dev) {
 239         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 240         return H_PARAMETER;
 241     }
 242     crq_mangle[0] = cpu_to_be64(msg_hi);
 243     crq_mangle[1] = cpu_to_be64(msg_lo);
 244
 245     if (dev->crq.SendFunc) {
 246         return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
 247     }
 248
 249     return H_HARDWARE;
 250 }
 251
 252 static target_ulong h_enable_crq(PowerPCCPU *cpu, SpaprMachineState *spapr,
 253                                  target_ulong opcode, target_ulong *args)
 254 {
 255     target_ulong reg = args[0];
 256     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 257
 258     if (!dev) {
 259         hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
 260         return H_PARAMETER;
 261     }
 262
 263     return 0;
 264 }
 265
 266 /* Returns negative error, 0 success, or positive: queue full */
 267 int spapr_vio_send_crq(SpaprVioDevice *dev, uint8_t *crq)
 268 {
 269     int rc;
 270     uint8_t byte;
 271
 272     if (!dev->crq.qsize) {
 273         error_report("spapr_vio_send_creq on uninitialized queue");
 274         return -1;
 275     }
 276
 277     /* Maybe do a fast path for KVM just writing to the pages */
 278     rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
 279     if (rc) {
 280         return rc;
 281     }
 282     if (byte != 0) {
 283         return 1;
 284     }
 285
 286     rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
 287                              &crq[8], 8);
 288     if (rc) {
 289         return rc;
 290     }
 291
 292     kvmppc_eieio();
 293
 294     rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
 295     if (rc) {
 296         return rc;
 297     }
 298
 299     dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
 300
 301     if (dev->signal_state & 1) {
 302         spapr_vio_irq_pulse(dev);
 303     }
 304
 305     return 0;
 306 }
 307
 308 /* "quiesce" handling */
 309
 310 static void spapr_vio_quiesce_one(SpaprVioDevice *dev)
 311 {
 312     if (dev->tcet) {
 313         device_cold_reset(DEVICE(dev->tcet));
 314     }
 315     free_crq(dev);
 316 }
 317
 318 void spapr_vio_set_bypass(SpaprVioDevice *dev, bool bypass)
 319 {
 320     if (!dev->tcet) {
 321         return;
 322     }
 323
 324     memory_region_set_enabled(&dev->mrbypass, bypass);
 325     memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass);
 326
 327     dev->tcet->bypass = bypass;
 328 }
 329
 330 static void rtas_set_tce_bypass(PowerPCCPU *cpu, SpaprMachineState *spapr,
 331                                 uint32_t token,
 332                                 uint32_t nargs, target_ulong args,
 333                                 uint32_t nret, target_ulong rets)
 334 {
 335     SpaprVioBus *bus = spapr->vio_bus;
 336     SpaprVioDevice *dev;
 337     uint32_t unit, enable;
 338
 339     if (nargs != 2) {
 340         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 341         return;
 342     }
 343     unit = rtas_ld(args, 0);
 344     enable = rtas_ld(args, 1);
 345     dev = spapr_vio_find_by_reg(bus, unit);
 346     if (!dev) {
 347         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 348         return;
 349     }
 350
 351     if (!dev->tcet) {
 352         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 353         return;
 354     }
 355
 356     spapr_vio_set_bypass(dev, !!enable);
 357
 358     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 359 }
 360
 361 static void rtas_quiesce(PowerPCCPU *cpu, SpaprMachineState *spapr,
 362                          uint32_t token,
 363                          uint32_t nargs, target_ulong args,
 364                          uint32_t nret, target_ulong rets)
 365 {
 366     SpaprVioBus *bus = spapr->vio_bus;
 367     BusChild *kid;
 368     SpaprVioDevice *dev = NULL;
 369
 370     if (nargs != 0) {
 371         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 372         return;
 373     }
 374
 375     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 376         dev = (SpaprVioDevice *)kid->child;
 377         spapr_vio_quiesce_one(dev);
 378     }
 379
 380     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 381 }
 382
 383 static SpaprVioDevice *reg_conflict(SpaprVioDevice *dev)
 384 {
 385     SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
 386     BusChild *kid;
 387     SpaprVioDevice *other;
 388
 389     /*
 390      * Check for a device other than the given one which is already
 391      * using the requested address. We have to open code this because
 392      * the given dev might already be in the list.
 393      */
 394     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 395         other = VIO_SPAPR_DEVICE(kid->child);
 396
 397         if (other != dev && other->reg == dev->reg) {
 398             return other;
 399         }
 400     }
 401
 402     return 0;
 403 }
 404
 405 static void spapr_vio_busdev_reset(DeviceState *qdev)
 406 {
 407     SpaprVioDevice *dev = VIO_SPAPR_DEVICE(qdev);
 408     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 409
 410     /* Shut down the request queue and TCEs if necessary */
 411     spapr_vio_quiesce_one(dev);
 412
 413     dev->signal_state = 0;
 414
 415     spapr_vio_set_bypass(dev, false);
 416     if (pc->reset) {
 417         pc->reset(dev);
 418     }
 419 }
 420
 421 /*
 422  * The register property of a VIO device is defined in libvirt using
 423  * 0x1000 as a base register number plus a 0x1000 increment. For the
 424  * VIO tty device, the base number is changed to 0x30000000. QEMU uses
 425  * a base register number of 0x71000000 and then a simple increment.
 426  *
 427  * The formula below tries to compute a unique index number from the
 428  * register value that will be used to define the IRQ number of the
 429  * VIO device.
 430  *
 431  * A maximum of 256 VIO devices is covered. Collisions are possible
 432  * but they will be detected when the IRQ is claimed.
 433  */
 434 static inline uint32_t spapr_vio_reg_to_irq(uint32_t reg)
 435 {
 436     uint32_t irq;
 437
 438     if (reg >= SPAPR_VIO_REG_BASE) {
 439         /*
 440          * VIO device register values when allocated by QEMU. For
 441          * these, we simply mask the high bits to fit the overall
 442          * range: [0x00 - 0xff].
 443          *
 444          * The nvram VIO device (reg=0x71000000) is a static device of
 445          * the pseries machine and so is always allocated by QEMU. Its
 446          * IRQ number is 0x0.
 447          */
 448         irq = reg & 0xff;
 449
 450     } else if (reg >= 0x30000000) {
 451         /*
 452          * VIO tty devices register values, when allocated by libvirt,
 453          * are mapped in range [0xf0 - 0xff], gives us a maximum of 16
 454          * vtys.
 455          */
 456         irq = 0xf0 | ((reg >> 12) & 0xf);
 457
 458     } else {
 459         /*
 460          * Other VIO devices register values, when allocated by
 461          * libvirt, should be mapped in range [0x00 - 0xef]. Conflicts
 462          * will be detected when IRQ is claimed.
 463          */
 464         irq = (reg >> 12) & 0xff;
 465     }
 466
 467     return SPAPR_IRQ_VIO | irq;
 468 }
 469
 470 static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
 471 {
 472     SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 473     SpaprVioDevice *dev = (SpaprVioDevice *)qdev;
 474     SpaprVioDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 475     char *id;
 476
 477     if (dev->reg != -1) {
 478         /*
 479          * Explicitly assigned address, just verify that no-one else
 480          * is using it.  other mechanism). We have to open code this
 481          * rather than using spapr_vio_find_by_reg() because sdev
 482          * itself is already in the list.
 483          */
 484         SpaprVioDevice *other = reg_conflict(dev);
 485
 486         if (other) {
 487             error_setg(errp, "%s and %s devices conflict at address %#x",
 488                        object_get_typename(OBJECT(qdev)),
 489                        object_get_typename(OBJECT(&other->qdev)),
 490                        dev->reg);
 491             return;
 492         }
 493     } else {
 494         /* Need to assign an address */
 495         SpaprVioBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
 496
 497         do {
 498             dev->reg = bus->next_reg++;
 499         } while (reg_conflict(dev));
 500     }
 501
 502     /* Don't overwrite ids assigned on the command line */
 503     if (!dev->qdev.id) {
 504         id = spapr_vio_get_dev_name(DEVICE(dev));
 505         dev->qdev.id = id;
 506     }
 507
 508     dev->irq = spapr_vio_reg_to_irq(dev->reg);
 509
 510     if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
 511         int irq = spapr_irq_findone(spapr, errp);
 512
 513         if (irq < 0) {
 514             return;
 515         }
 516         dev->irq = irq;
 517     }
 518
 519     if (spapr_irq_claim(spapr, dev->irq, false, errp) < 0) {
 520         return;
 521     }
 522
 523     if (pc->rtce_window_size) {
 524         uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
 525
 526         memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
 527                            MACHINE(spapr)->ram_size);
 528         memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
 529                                  "iommu-spapr-bypass", get_system_memory(),
 530                                  0, MACHINE(spapr)->ram_size);
 531         memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1);
 532         address_space_init(&dev->as, &dev->mrroot, qdev->id);
 533
 534         dev->tcet = spapr_tce_new_table(qdev, liobn);
 535         spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0,
 536                                pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT);
 537         dev->tcet->vdev = dev;
 538         memory_region_add_subregion_overlap(&dev->mrroot, 0,
 539                                             spapr_tce_get_iommu(dev->tcet), 2);
 540     }
 541
 542     pc->realize(dev, errp);
 543 }
 544
 545 static target_ulong h_vio_signal(PowerPCCPU *cpu, SpaprMachineState *spapr,
 546                                  target_ulong opcode,
 547                                  target_ulong *args)
 548 {
 549     target_ulong reg = args[0];
 550     target_ulong mode = args[1];
 551     SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
 552     SpaprVioDeviceClass *pc;
 553
 554     if (!dev) {
 555         return H_PARAMETER;
 556     }
 557
 558     pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 559
 560     if (mode & ~pc->signal_mask) {
 561         return H_PARAMETER;
 562     }
 563
 564     dev->signal_state = mode;
 565
 566     return H_SUCCESS;
 567 }
 568
 569 SpaprVioBus *spapr_vio_bus_init(void)
 570 {
 571     SpaprVioBus *bus;
 572     BusState *qbus;
 573     DeviceState *dev;
 574
 575     /* Create bridge device */
 576     dev = qdev_new(TYPE_SPAPR_VIO_BRIDGE);
 577     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 578
 579     /* Create bus on bridge device */
 580     qbus = qbus_new(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
 581     bus = SPAPR_VIO_BUS(qbus);
 582     bus->next_reg = SPAPR_VIO_REG_BASE;
 583
 584     /* hcall-vio */
 585     spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
 586
 587     /* hcall-crq */
 588     spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
 589     spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
 590     spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
 591     spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
 592
 593     /* RTAS calls */
 594     spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
 595                         rtas_set_tce_bypass);
 596     spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce);
 597
 598     return bus;
 599 }
 600
 601 static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
 602 {
 603     DeviceClass *dc = DEVICE_CLASS(klass);
 604
 605     dc->fw_name = "vdevice";
 606 }
 607
 608 static const TypeInfo spapr_vio_bridge_info = {
 609     .name          = TYPE_SPAPR_VIO_BRIDGE,
 610     .parent        = TYPE_SYS_BUS_DEVICE,
 611     .class_init    = spapr_vio_bridge_class_init,
 612 };
 613
 614 const VMStateDescription vmstate_spapr_vio = {
 615     .name = "spapr_vio",
 616     .version_id = 1,
 617     .minimum_version_id = 1,
 618     .fields = (VMStateField[]) {
 619         /* Sanity check */
 620         VMSTATE_UINT32_EQUAL(reg, SpaprVioDevice, NULL),
 621         VMSTATE_UINT32_EQUAL(irq, SpaprVioDevice, NULL),
 622
 623         /* General VIO device state */
 624         VMSTATE_UINT64(signal_state, SpaprVioDevice),
 625         VMSTATE_UINT64(crq.qladdr, SpaprVioDevice),
 626         VMSTATE_UINT32(crq.qsize, SpaprVioDevice),
 627         VMSTATE_UINT32(crq.qnext, SpaprVioDevice),
 628
 629         VMSTATE_END_OF_LIST()
 630     },
 631 };
 632
 633 static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
 634 {
 635     DeviceClass *k = DEVICE_CLASS(klass);
 636     k->realize = spapr_vio_busdev_realize;
 637     k->reset = spapr_vio_busdev_reset;
 638     k->bus_type = TYPE_SPAPR_VIO_BUS;
 639 }
 640
 641 static const TypeInfo spapr_vio_type_info = {
 642     .name = TYPE_VIO_SPAPR_DEVICE,
 643     .parent = TYPE_DEVICE,
 644     .instance_size = sizeof(SpaprVioDevice),
 645     .abstract = true,
 646     .class_size = sizeof(SpaprVioDeviceClass),
 647     .class_init = vio_spapr_device_class_init,
 648 };
 649
 650 static void spapr_vio_register_types(void)
 651 {
 652     type_register_static(&spapr_vio_bus_info);
 653     type_register_static(&spapr_vio_bridge_info);
 654     type_register_static(&spapr_vio_type_info);
 655 }
 656
 657 type_init(spapr_vio_register_types)
 658
 659 static int compare_reg(const void *p1, const void *p2)
 660 {
 661     SpaprVioDevice const *dev1, *dev2;
 662
 663     dev1 = (SpaprVioDevice *)*(DeviceState **)p1;
 664     dev2 = (SpaprVioDevice *)*(DeviceState **)p2;
 665
 666     if (dev1->reg < dev2->reg) {
 667         return -1;
 668     }
 669     if (dev1->reg == dev2->reg) {
 670         return 0;
 671     }
 672
 673     /* dev1->reg > dev2->reg */
 674     return 1;
 675 }
 676
 677 void spapr_dt_vdevice(SpaprVioBus *bus, void *fdt)
 678 {
 679     DeviceState *qdev, **qdevs;
 680     BusChild *kid;
 681     int i, num, ret = 0;
 682     int node;
 683
 684     _FDT(node = fdt_add_subnode(fdt, 0, "vdevice"));
 685
 686     _FDT(fdt_setprop_string(fdt, node, "device_type", "vdevice"));
 687     _FDT(fdt_setprop_string(fdt, node, "compatible", "IBM,vdevice"));
 688     _FDT(fdt_setprop_cell(fdt, node, "#address-cells", 1));
 689     _FDT(fdt_setprop_cell(fdt, node, "#size-cells", 0));
 690     _FDT(fdt_setprop_cell(fdt, node, "#interrupt-cells", 2));
 691     _FDT(fdt_setprop(fdt, node, "interrupt-controller", NULL, 0));
 692
 693     /* Count qdevs on the bus list */
 694     num = 0;
 695     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 696         num++;
 697     }
 698
 699     /* Copy out into an array of pointers */
 700     qdevs = g_new(DeviceState *, num);
 701     num = 0;
 702     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 703         qdevs[num++] = kid->child;
 704     }
 705
 706     /* Sort the array */
 707     qsort(qdevs, num, sizeof(qdev), compare_reg);
 708
 709     /* Hack alert. Give the devices to libfdt in reverse order, we happen
 710      * to know that will mean they are in forward order in the tree. */
 711     for (i = num - 1; i >= 0; i--) {
 712         SpaprVioDevice *dev = (SpaprVioDevice *)(qdevs[i]);
 713         SpaprVioDeviceClass *vdc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
 714
 715         ret = vio_make_devnode(dev, fdt);
 716         if (ret < 0) {
 717             error_report("Couldn't create device node /vdevice/%s@%"PRIx32,
 718                          vdc->dt_name, dev->reg);
 719             exit(1);
 720         }
 721     }
 722
 723     g_free(qdevs);
 724 }
 725
 726 gchar *spapr_vio_stdout_path(SpaprVioBus *bus)
 727 {
 728     SpaprVioDevice *dev;
 729     g_autofree char *name = NULL;
 730
 731     dev = spapr_vty_get_default(bus);
 732     if (!dev) {
 733         return NULL;
 734     }
 735
 736     name = spapr_vio_get_dev_name(DEVICE(dev));
 737
 738     return g_strdup_printf("/vdevice/%s", name);
 739 }