hw/acpi_piix4.c

   1 /*
   2  * ACPI implementation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License version 2 as published by the Free Software Foundation.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  17  *
  18  * Contributions after 2012-01-13 are licensed under the terms of the
  19  * GNU GPL, version 2 or (at your option) any later version.
  20  */
  21 #include "hw.h"
  22 #include "pc.h"
  23 #include "apm.h"
  24 #include "pm_smbus.h"
  25 #include "pci.h"
  26 #include "acpi.h"
  27 #include "sysemu.h"
  28 #include "range.h"
  29 #include "ioport.h"
  30 #include "fw_cfg.h"
  31
  32 //#define DEBUG
  33
  34 #ifdef DEBUG
  35 # define PIIX4_DPRINTF(format, ...)     printf(format, ## __VA_ARGS__)
  36 #else
  37 # define PIIX4_DPRINTF(format, ...)     do { } while (0)
  38 #endif
  39
  40 #define ACPI_DBG_IO_ADDR  0xb044
  41
  42 #define GPE_BASE 0xafe0
  43 #define GPE_LEN 4
  44 #define PCI_UP_BASE 0xae00
  45 #define PCI_DOWN_BASE 0xae04
  46 #define PCI_EJ_BASE 0xae08
  47 #define PCI_RMV_BASE 0xae0c
  48
  49 #define PIIX4_PCI_HOTPLUG_STATUS 2
  50
  51 struct pci_status {
  52     uint32_t up; /* deprecated, maintained for migration compatibility */
  53     uint32_t down;
  54 };
  55
  56 typedef struct PIIX4PMState {
  57     PCIDevice dev;
  58     IORange ioport;
  59     ACPIREGS ar;
  60
  61     APMState apm;
  62
  63     PMSMBus smb;
  64     uint32_t smb_io_base;
  65
  66     qemu_irq irq;
  67     qemu_irq smi_irq;
  68     int kvm_enabled;
  69     Notifier machine_ready;
  70     Notifier powerdown_notifier;
  71
  72     /* for pci hotplug */
  73     struct pci_status pci0_status;
  74     uint32_t pci0_hotplug_enable;
  75     uint32_t pci0_slot_device_present;
  76
  77     uint8_t disable_s3;
  78     uint8_t disable_s4;
  79     uint8_t s4_val;
  80 } PIIX4PMState;
  81
  82 static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s);
  83
  84 #define ACPI_ENABLE 0xf1
  85 #define ACPI_DISABLE 0xf0
  86
  87 static void pm_update_sci(PIIX4PMState *s)
  88 {
  89     int sci_level, pmsts;
  90
  91     pmsts = acpi_pm1_evt_get_sts(&s->ar);
  92     sci_level = (((pmsts & s->ar.pm1.evt.en) &
  93                   (ACPI_BITMASK_RT_CLOCK_ENABLE |
  94                    ACPI_BITMASK_POWER_BUTTON_ENABLE |
  95                    ACPI_BITMASK_GLOBAL_LOCK_ENABLE |
  96                    ACPI_BITMASK_TIMER_ENABLE)) != 0) ||
  97         (((s->ar.gpe.sts[0] & s->ar.gpe.en[0])
  98           & PIIX4_PCI_HOTPLUG_STATUS) != 0);
  99
 100     qemu_set_irq(s->irq, sci_level);
 101     /* schedule a timer interruption if needed */
 102     acpi_pm_tmr_update(&s->ar, (s->ar.pm1.evt.en & ACPI_BITMASK_TIMER_ENABLE) &&
 103                        !(pmsts & ACPI_BITMASK_TIMER_STATUS));
 104 }
 105
 106 static void pm_tmr_timer(ACPIREGS *ar)
 107 {
 108     PIIX4PMState *s = container_of(ar, PIIX4PMState, ar);
 109     pm_update_sci(s);
 110 }
 111
 112 static void pm_ioport_write(IORange *ioport, uint64_t addr, unsigned width,
 113                             uint64_t val)
 114 {
 115     PIIX4PMState *s = container_of(ioport, PIIX4PMState, ioport);
 116
 117     if (width != 2) {
 118         PIIX4_DPRINTF("PM write port=0x%04x width=%d val=0x%08x\n",
 119                       (unsigned)addr, width, (unsigned)val);
 120     }
 121
 122     switch(addr) {
 123     case 0x00:
 124         acpi_pm1_evt_write_sts(&s->ar, val);
 125         pm_update_sci(s);
 126         break;
 127     case 0x02:
 128         acpi_pm1_evt_write_en(&s->ar, val);
 129         pm_update_sci(s);
 130         break;
 131     case 0x04:
 132         acpi_pm1_cnt_write(&s->ar, val, s->s4_val);
 133         break;
 134     default:
 135         break;
 136     }
 137     PIIX4_DPRINTF("PM writew port=0x%04x val=0x%04x\n", (unsigned int)addr,
 138                   (unsigned int)val);
 139 }
 140
 141 static void pm_ioport_read(IORange *ioport, uint64_t addr, unsigned width,
 142                             uint64_t *data)
 143 {
 144     PIIX4PMState *s = container_of(ioport, PIIX4PMState, ioport);
 145     uint32_t val;
 146
 147     switch(addr) {
 148     case 0x00:
 149         val = acpi_pm1_evt_get_sts(&s->ar);
 150         break;
 151     case 0x02:
 152         val = s->ar.pm1.evt.en;
 153         break;
 154     case 0x04:
 155         val = s->ar.pm1.cnt.cnt;
 156         break;
 157     case 0x08:
 158         val = acpi_pm_tmr_get(&s->ar);
 159         break;
 160     default:
 161         val = 0;
 162         break;
 163     }
 164     PIIX4_DPRINTF("PM readw port=0x%04x val=0x%04x\n", (unsigned int)addr, val);
 165     *data = val;
 166 }
 167
 168 static const IORangeOps pm_iorange_ops = {
 169     .read = pm_ioport_read,
 170     .write = pm_ioport_write,
 171 };
 172
 173 static void apm_ctrl_changed(uint32_t val, void *arg)
 174 {
 175     PIIX4PMState *s = arg;
 176
 177     /* ACPI specs 3.0, 4.7.2.5 */
 178     acpi_pm1_cnt_update(&s->ar, val == ACPI_ENABLE, val == ACPI_DISABLE);
 179
 180     if (s->dev.config[0x5b] & (1 << 1)) {
 181         if (s->smi_irq) {
 182             qemu_irq_raise(s->smi_irq);
 183         }
 184     }
 185 }
 186
 187 static void acpi_dbg_writel(void *opaque, uint32_t addr, uint32_t val)
 188 {
 189     PIIX4_DPRINTF("ACPI: DBG: 0x%08x\n", val);
 190 }
 191
 192 static void pm_io_space_update(PIIX4PMState *s)
 193 {
 194     uint32_t pm_io_base;
 195
 196     if (s->dev.config[0x80] & 1) {
 197         pm_io_base = le32_to_cpu(*(uint32_t *)(s->dev.config + 0x40));
 198         pm_io_base &= 0xffc0;
 199
 200         /* XXX: need to improve memory and ioport allocation */
 201         PIIX4_DPRINTF("PM: mapping to 0x%x\n", pm_io_base);
 202         iorange_init(&s->ioport, &pm_iorange_ops, pm_io_base, 64);
 203         ioport_register(&s->ioport);
 204     }
 205 }
 206
 207 static void pm_write_config(PCIDevice *d,
 208                             uint32_t address, uint32_t val, int len)
 209 {
 210     pci_default_write_config(d, address, val, len);
 211     if (range_covers_byte(address, len, 0x80))
 212         pm_io_space_update((PIIX4PMState *)d);
 213 }
 214
 215 static void vmstate_pci_status_pre_save(void *opaque)
 216 {
 217     struct pci_status *pci0_status = opaque;
 218     PIIX4PMState *s = container_of(pci0_status, PIIX4PMState, pci0_status);
 219
 220     /* We no longer track up, so build a safe value for migrating
 221      * to a version that still does... of course these might get lost
 222      * by an old buggy implementation, but we try. */
 223     pci0_status->up = s->pci0_slot_device_present & s->pci0_hotplug_enable;
 224 }
 225
 226 static int vmstate_acpi_post_load(void *opaque, int version_id)
 227 {
 228     PIIX4PMState *s = opaque;
 229
 230     pm_io_space_update(s);
 231     return 0;
 232 }
 233
 234 #define VMSTATE_GPE_ARRAY(_field, _state)                            \
 235  {                                                                   \
 236      .name       = (stringify(_field)),                              \
 237      .version_id = 0,                                                \
 238      .num        = GPE_LEN,                                          \
 239      .info       = &vmstate_info_uint16,                             \
 240      .size       = sizeof(uint16_t),                                 \
 241      .flags      = VMS_ARRAY | VMS_POINTER,                          \
 242      .offset     = vmstate_offset_pointer(_state, _field, uint8_t),  \
 243  }
 244
 245 static const VMStateDescription vmstate_gpe = {
 246     .name = "gpe",
 247     .version_id = 1,
 248     .minimum_version_id = 1,
 249     .minimum_version_id_old = 1,
 250     .fields      = (VMStateField []) {
 251         VMSTATE_GPE_ARRAY(sts, ACPIGPE),
 252         VMSTATE_GPE_ARRAY(en, ACPIGPE),
 253         VMSTATE_END_OF_LIST()
 254     }
 255 };
 256
 257 static const VMStateDescription vmstate_pci_status = {
 258     .name = "pci_status",
 259     .version_id = 1,
 260     .minimum_version_id = 1,
 261     .minimum_version_id_old = 1,
 262     .pre_save = vmstate_pci_status_pre_save,
 263     .fields      = (VMStateField []) {
 264         VMSTATE_UINT32(up, struct pci_status),
 265         VMSTATE_UINT32(down, struct pci_status),
 266         VMSTATE_END_OF_LIST()
 267     }
 268 };
 269
 270 static const VMStateDescription vmstate_acpi = {
 271     .name = "piix4_pm",
 272     .version_id = 2,
 273     .minimum_version_id = 1,
 274     .minimum_version_id_old = 1,
 275     .post_load = vmstate_acpi_post_load,
 276     .fields      = (VMStateField []) {
 277         VMSTATE_PCI_DEVICE(dev, PIIX4PMState),
 278         VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState),
 279         VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
 280         VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
 281         VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
 282         VMSTATE_TIMER(ar.tmr.timer, PIIX4PMState),
 283         VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
 284         VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
 285         VMSTATE_STRUCT(pci0_status, PIIX4PMState, 2, vmstate_pci_status,
 286                        struct pci_status),
 287         VMSTATE_END_OF_LIST()
 288     }
 289 };
 290
 291 static void acpi_piix_eject_slot(PIIX4PMState *s, unsigned slots)
 292 {
 293     BusChild *kid, *next;
 294     BusState *bus = qdev_get_parent_bus(&s->dev.qdev);
 295     int slot = ffs(slots) - 1;
 296     bool slot_free = true;
 297
 298     /* Mark request as complete */
 299     s->pci0_status.down &= ~(1U << slot);
 300
 301     QTAILQ_FOREACH_SAFE(kid, &bus->children, sibling, next) {
 302         DeviceState *qdev = kid->child;
 303         PCIDevice *dev = PCI_DEVICE(qdev);
 304         PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
 305         if (PCI_SLOT(dev->devfn) == slot) {
 306             if (pc->no_hotplug) {
 307                 slot_free = false;
 308             } else {
 309                 qdev_free(qdev);
 310             }
 311         }
 312     }
 313     if (slot_free) {
 314         s->pci0_slot_device_present &= ~(1U << slot);
 315     }
 316 }
 317
 318 static void piix4_update_hotplug(PIIX4PMState *s)
 319 {
 320     PCIDevice *dev = &s->dev;
 321     BusState *bus = qdev_get_parent_bus(&dev->qdev);
 322     BusChild *kid, *next;
 323
 324     /* Execute any pending removes during reset */
 325     while (s->pci0_status.down) {
 326         acpi_piix_eject_slot(s, s->pci0_status.down);
 327     }
 328
 329     s->pci0_hotplug_enable = ~0;
 330     s->pci0_slot_device_present = 0;
 331
 332     QTAILQ_FOREACH_SAFE(kid, &bus->children, sibling, next) {
 333         DeviceState *qdev = kid->child;
 334         PCIDevice *pdev = PCI_DEVICE(qdev);
 335         PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pdev);
 336         int slot = PCI_SLOT(pdev->devfn);
 337
 338         if (pc->no_hotplug) {
 339             s->pci0_hotplug_enable &= ~(1U << slot);
 340         }
 341
 342         s->pci0_slot_device_present |= (1U << slot);
 343     }
 344 }
 345
 346 static void piix4_reset(void *opaque)
 347 {
 348     PIIX4PMState *s = opaque;
 349     uint8_t *pci_conf = s->dev.config;
 350
 351     pci_conf[0x58] = 0;
 352     pci_conf[0x59] = 0;
 353     pci_conf[0x5a] = 0;
 354     pci_conf[0x5b] = 0;
 355
 356     pci_conf[0x40] = 0x01; /* PM io base read only bit */
 357     pci_conf[0x80] = 0;
 358
 359     if (s->kvm_enabled) {
 360         /* Mark SMM as already inited (until KVM supports SMM). */
 361         pci_conf[0x5B] = 0x02;
 362     }
 363     piix4_update_hotplug(s);
 364 }
 365
 366 static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
 367 {
 368     PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier);
 369
 370     assert(s != NULL);
 371     acpi_pm1_evt_power_down(&s->ar);
 372 }
 373
 374 static void piix4_pm_machine_ready(Notifier *n, void *opaque)
 375 {
 376     PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready);
 377     uint8_t *pci_conf;
 378
 379     pci_conf = s->dev.config;
 380     pci_conf[0x5f] = (isa_is_ioport_assigned(0x378) ? 0x80 : 0) | 0x10;
 381     pci_conf[0x63] = 0x60;
 382     pci_conf[0x67] = (isa_is_ioport_assigned(0x3f8) ? 0x08 : 0) |
 383         (isa_is_ioport_assigned(0x2f8) ? 0x90 : 0);
 384
 385 }
 386
 387 static int piix4_pm_initfn(PCIDevice *dev)
 388 {
 389     PIIX4PMState *s = DO_UPCAST(PIIX4PMState, dev, dev);
 390     uint8_t *pci_conf;
 391
 392     pci_conf = s->dev.config;
 393     pci_conf[0x06] = 0x80;
 394     pci_conf[0x07] = 0x02;
 395     pci_conf[0x09] = 0x00;
 396     pci_conf[0x3d] = 0x01; // interrupt pin 1
 397
 398     /* APM */
 399     apm_init(&s->apm, apm_ctrl_changed, s);
 400
 401     register_ioport_write(ACPI_DBG_IO_ADDR, 4, 4, acpi_dbg_writel, s);
 402
 403     if (s->kvm_enabled) {
 404         /* Mark SMM as already inited to prevent SMM from running.  KVM does not
 405          * support SMM mode. */
 406         pci_conf[0x5B] = 0x02;
 407     }
 408
 409     /* XXX: which specification is used ? The i82731AB has different
 410        mappings */
 411     pci_conf[0x90] = s->smb_io_base | 1;
 412     pci_conf[0x91] = s->smb_io_base >> 8;
 413     pci_conf[0xd2] = 0x09;
 414     register_ioport_write(s->smb_io_base, 64, 1, smb_ioport_writeb, &s->smb);
 415     register_ioport_read(s->smb_io_base, 64, 1, smb_ioport_readb, &s->smb);
 416
 417     acpi_pm_tmr_init(&s->ar, pm_tmr_timer);
 418     acpi_gpe_init(&s->ar, GPE_LEN);
 419
 420     s->powerdown_notifier.notify = piix4_pm_powerdown_req;
 421     qemu_register_powerdown_notifier(&s->powerdown_notifier);
 422
 423     pm_smbus_init(&s->dev.qdev, &s->smb);
 424     s->machine_ready.notify = piix4_pm_machine_ready;
 425     qemu_add_machine_init_done_notifier(&s->machine_ready);
 426     qemu_register_reset(piix4_reset, s);
 427     piix4_acpi_system_hot_add_init(dev->bus, s);
 428
 429     return 0;
 430 }
 431
 432 i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
 433                        qemu_irq sci_irq, qemu_irq smi_irq,
 434                        int kvm_enabled, void *fw_cfg)
 435 {
 436     PCIDevice *dev;
 437     PIIX4PMState *s;
 438
 439     dev = pci_create(bus, devfn, "PIIX4_PM");
 440     qdev_prop_set_uint32(&dev->qdev, "smb_io_base", smb_io_base);
 441
 442     s = DO_UPCAST(PIIX4PMState, dev, dev);
 443     s->irq = sci_irq;
 444     acpi_pm1_cnt_init(&s->ar);
 445     s->smi_irq = smi_irq;
 446     s->kvm_enabled = kvm_enabled;
 447
 448     qdev_init_nofail(&dev->qdev);
 449
 450     if (fw_cfg) {
 451         uint8_t suspend[6] = {128, 0, 0, 129, 128, 128};
 452         suspend[3] = 1 | ((!s->disable_s3) << 7);
 453         suspend[4] = s->s4_val | ((!s->disable_s4) << 7);
 454
 455         fw_cfg_add_file(fw_cfg, "etc/system-states", g_memdup(suspend, 6), 6);
 456     }
 457
 458     return s->smb.smbus;
 459 }
 460
 461 static Property piix4_pm_properties[] = {
 462     DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0),
 463     DEFINE_PROP_UINT8("disable_s3", PIIX4PMState, disable_s3, 0),
 464     DEFINE_PROP_UINT8("disable_s4", PIIX4PMState, disable_s4, 0),
 465     DEFINE_PROP_UINT8("s4_val", PIIX4PMState, s4_val, 2),
 466     DEFINE_PROP_END_OF_LIST(),
 467 };
 468
 469 static void piix4_pm_class_init(ObjectClass *klass, void *data)
 470 {
 471     DeviceClass *dc = DEVICE_CLASS(klass);
 472     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 473
 474     k->no_hotplug = 1;
 475     k->init = piix4_pm_initfn;
 476     k->config_write = pm_write_config;
 477     k->vendor_id = PCI_VENDOR_ID_INTEL;
 478     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3;
 479     k->revision = 0x03;
 480     k->class_id = PCI_CLASS_BRIDGE_OTHER;
 481     dc->desc = "PM";
 482     dc->no_user = 1;
 483     dc->vmsd = &vmstate_acpi;
 484     dc->props = piix4_pm_properties;
 485 }
 486
 487 static TypeInfo piix4_pm_info = {
 488     .name          = "PIIX4_PM",
 489     .parent        = TYPE_PCI_DEVICE,
 490     .instance_size = sizeof(PIIX4PMState),
 491     .class_init    = piix4_pm_class_init,
 492 };
 493
 494 static void piix4_pm_register_types(void)
 495 {
 496     type_register_static(&piix4_pm_info);
 497 }
 498
 499 type_init(piix4_pm_register_types)
 500
 501 static uint32_t gpe_readb(void *opaque, uint32_t addr)
 502 {
 503     PIIX4PMState *s = opaque;
 504     uint32_t val = acpi_gpe_ioport_readb(&s->ar, addr);
 505
 506     PIIX4_DPRINTF("gpe read %x == %x\n", addr, val);
 507     return val;
 508 }
 509
 510 static void gpe_writeb(void *opaque, uint32_t addr, uint32_t val)
 511 {
 512     PIIX4PMState *s = opaque;
 513
 514     acpi_gpe_ioport_writeb(&s->ar, addr, val);
 515     pm_update_sci(s);
 516
 517     PIIX4_DPRINTF("gpe write %x <== %d\n", addr, val);
 518 }
 519
 520 static uint32_t pci_up_read(void *opaque, uint32_t addr)
 521 {
 522     PIIX4PMState *s = opaque;
 523     uint32_t val;
 524
 525     /* Manufacture an "up" value to cause a device check on any hotplug
 526      * slot with a device.  Extra device checks are harmless. */
 527     val = s->pci0_slot_device_present & s->pci0_hotplug_enable;
 528
 529     PIIX4_DPRINTF("pci_up_read %x\n", val);
 530     return val;
 531 }
 532
 533 static uint32_t pci_down_read(void *opaque, uint32_t addr)
 534 {
 535     PIIX4PMState *s = opaque;
 536     uint32_t val = s->pci0_status.down;
 537
 538     PIIX4_DPRINTF("pci_down_read %x\n", val);
 539     return val;
 540 }
 541
 542 static uint32_t pci_features_read(void *opaque, uint32_t addr)
 543 {
 544     /* No feature defined yet */
 545     PIIX4_DPRINTF("pci_features_read %x\n", 0);
 546     return 0;
 547 }
 548
 549 static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
 550 {
 551     acpi_piix_eject_slot(opaque, val);
 552
 553     PIIX4_DPRINTF("pciej write %x <== %d\n", addr, val);
 554 }
 555
 556 static uint32_t pcirmv_read(void *opaque, uint32_t addr)
 557 {
 558     PIIX4PMState *s = opaque;
 559
 560     return s->pci0_hotplug_enable;
 561 }
 562
 563 static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev,
 564                                 PCIHotplugState state);
 565
 566 static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s)
 567 {
 568
 569     register_ioport_write(GPE_BASE, GPE_LEN, 1, gpe_writeb, s);
 570     register_ioport_read(GPE_BASE, GPE_LEN, 1,  gpe_readb, s);
 571     acpi_gpe_blk(&s->ar, GPE_BASE);
 572
 573     register_ioport_read(PCI_UP_BASE, 4, 4, pci_up_read, s);
 574     register_ioport_read(PCI_DOWN_BASE, 4, 4, pci_down_read, s);
 575
 576     register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, s);
 577     register_ioport_read(PCI_EJ_BASE, 4, 4,  pci_features_read, s);
 578
 579     register_ioport_read(PCI_RMV_BASE, 4, 4,  pcirmv_read, s);
 580
 581     pci_bus_hotplug(bus, piix4_device_hotplug, &s->dev.qdev);
 582 }
 583
 584 static void enable_device(PIIX4PMState *s, int slot)
 585 {
 586     s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS;
 587     s->pci0_slot_device_present |= (1U << slot);
 588 }
 589
 590 static void disable_device(PIIX4PMState *s, int slot)
 591 {
 592     s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS;
 593     s->pci0_status.down |= (1U << slot);
 594 }
 595
 596 static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev,
 597                                 PCIHotplugState state)
 598 {
 599     int slot = PCI_SLOT(dev->devfn);
 600     PIIX4PMState *s = DO_UPCAST(PIIX4PMState, dev,
 601                                 PCI_DEVICE(qdev));
 602
 603     /* Don't send event when device is enabled during qemu machine creation:
 604      * it is present on boot, no hotplug event is necessary. We do send an
 605      * event when the device is disabled later. */
 606     if (state == PCI_COLDPLUG_ENABLED) {
 607         s->pci0_slot_device_present |= (1U << slot);
 608         return 0;
 609     }
 610
 611     if (state == PCI_HOTPLUG_ENABLED) {
 612         enable_device(s, slot);
 613     } else {
 614         disable_device(s, slot);
 615     }
 616
 617     pm_update_sci(s);
 618
 619     return 0;
 620 }