xref: /openbmc/qemu/hw/acpi/piix4.c (revision 6807874d55b380a2478d56d5e61e10805e315026)
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 "qemu/osdep.h"
22 #include "hw/hw.h"
23 #include "hw/i386/pc.h"
24 #include "hw/isa/apm.h"
25 #include "hw/i2c/pm_smbus.h"
26 #include "hw/pci/pci.h"
27 #include "hw/acpi/acpi.h"
28 #include "sysemu/sysemu.h"
29 #include "qapi/error.h"
30 #include "qemu/range.h"
31 #include "exec/address-spaces.h"
32 #include "hw/acpi/piix4.h"
33 #include "hw/acpi/pcihp.h"
34 #include "hw/acpi/cpu_hotplug.h"
35 #include "hw/acpi/cpu.h"
36 #include "hw/hotplug.h"
37 #include "hw/mem/pc-dimm.h"
38 #include "hw/acpi/memory_hotplug.h"
39 #include "hw/acpi/acpi_dev_interface.h"
40 #include "hw/xen/xen.h"
41 #include "qom/cpu.h"
42 
43 //#define DEBUG
44 
45 #ifdef DEBUG
46 # define PIIX4_DPRINTF(format, ...)     printf(format, ## __VA_ARGS__)
47 #else
48 # define PIIX4_DPRINTF(format, ...)     do { } while (0)
49 #endif
50 
51 #define GPE_BASE 0xafe0
52 #define GPE_LEN 4
53 
54 struct pci_status {
55     uint32_t up; /* deprecated, maintained for migration compatibility */
56     uint32_t down;
57 };
58 
59 typedef struct PIIX4PMState {
60     /*< private >*/
61     PCIDevice parent_obj;
62     /*< public >*/
63 
64     MemoryRegion io;
65     uint32_t io_base;
66 
67     MemoryRegion io_gpe;
68     ACPIREGS ar;
69 
70     APMState apm;
71 
72     PMSMBus smb;
73     uint32_t smb_io_base;
74 
75     qemu_irq irq;
76     qemu_irq smi_irq;
77     int smm_enabled;
78     Notifier machine_ready;
79     Notifier powerdown_notifier;
80 
81     AcpiPciHpState acpi_pci_hotplug;
82     bool use_acpi_pci_hotplug;
83 
84     uint8_t disable_s3;
85     uint8_t disable_s4;
86     uint8_t s4_val;
87 
88     bool cpu_hotplug_legacy;
89     AcpiCpuHotplug gpe_cpu;
90     CPUHotplugState cpuhp_state;
91 
92     MemHotplugState acpi_memory_hotplug;
93 } PIIX4PMState;
94 
95 #define PIIX4_PM(obj) \
96     OBJECT_CHECK(PIIX4PMState, (obj), TYPE_PIIX4_PM)
97 
98 static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
99                                            PCIBus *bus, PIIX4PMState *s);
100 
101 #define ACPI_ENABLE 0xf1
102 #define ACPI_DISABLE 0xf0
103 
104 static void pm_tmr_timer(ACPIREGS *ar)
105 {
106     PIIX4PMState *s = container_of(ar, PIIX4PMState, ar);
107     acpi_update_sci(&s->ar, s->irq);
108 }
109 
110 static void apm_ctrl_changed(uint32_t val, void *arg)
111 {
112     PIIX4PMState *s = arg;
113     PCIDevice *d = PCI_DEVICE(s);
114 
115     /* ACPI specs 3.0, 4.7.2.5 */
116     acpi_pm1_cnt_update(&s->ar, val == ACPI_ENABLE, val == ACPI_DISABLE);
117     if (val == ACPI_ENABLE || val == ACPI_DISABLE) {
118         return;
119     }
120 
121     if (d->config[0x5b] & (1 << 1)) {
122         if (s->smi_irq) {
123             qemu_irq_raise(s->smi_irq);
124         }
125     }
126 }
127 
128 static void pm_io_space_update(PIIX4PMState *s)
129 {
130     PCIDevice *d = PCI_DEVICE(s);
131 
132     s->io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x40));
133     s->io_base &= 0xffc0;
134 
135     memory_region_transaction_begin();
136     memory_region_set_enabled(&s->io, d->config[0x80] & 1);
137     memory_region_set_address(&s->io, s->io_base);
138     memory_region_transaction_commit();
139 }
140 
141 static void smbus_io_space_update(PIIX4PMState *s)
142 {
143     PCIDevice *d = PCI_DEVICE(s);
144 
145     s->smb_io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x90));
146     s->smb_io_base &= 0xffc0;
147 
148     memory_region_transaction_begin();
149     memory_region_set_enabled(&s->smb.io, d->config[0xd2] & 1);
150     memory_region_set_address(&s->smb.io, s->smb_io_base);
151     memory_region_transaction_commit();
152 }
153 
154 static void pm_write_config(PCIDevice *d,
155                             uint32_t address, uint32_t val, int len)
156 {
157     pci_default_write_config(d, address, val, len);
158     if (range_covers_byte(address, len, 0x80) ||
159         ranges_overlap(address, len, 0x40, 4)) {
160         pm_io_space_update((PIIX4PMState *)d);
161     }
162     if (range_covers_byte(address, len, 0xd2) ||
163         ranges_overlap(address, len, 0x90, 4)) {
164         smbus_io_space_update((PIIX4PMState *)d);
165     }
166 }
167 
168 static int vmstate_acpi_post_load(void *opaque, int version_id)
169 {
170     PIIX4PMState *s = opaque;
171 
172     pm_io_space_update(s);
173     smbus_io_space_update(s);
174     return 0;
175 }
176 
177 #define VMSTATE_GPE_ARRAY(_field, _state)                            \
178  {                                                                   \
179      .name       = (stringify(_field)),                              \
180      .version_id = 0,                                                \
181      .info       = &vmstate_info_uint16,                             \
182      .size       = sizeof(uint16_t),                                 \
183      .flags      = VMS_SINGLE | VMS_POINTER,                         \
184      .offset     = vmstate_offset_pointer(_state, _field, uint8_t),  \
185  }
186 
187 static const VMStateDescription vmstate_gpe = {
188     .name = "gpe",
189     .version_id = 1,
190     .minimum_version_id = 1,
191     .fields = (VMStateField[]) {
192         VMSTATE_GPE_ARRAY(sts, ACPIGPE),
193         VMSTATE_GPE_ARRAY(en, ACPIGPE),
194         VMSTATE_END_OF_LIST()
195     }
196 };
197 
198 static const VMStateDescription vmstate_pci_status = {
199     .name = "pci_status",
200     .version_id = 1,
201     .minimum_version_id = 1,
202     .fields = (VMStateField[]) {
203         VMSTATE_UINT32(up, struct AcpiPciHpPciStatus),
204         VMSTATE_UINT32(down, struct AcpiPciHpPciStatus),
205         VMSTATE_END_OF_LIST()
206     }
207 };
208 
209 static int acpi_load_old(QEMUFile *f, void *opaque, int version_id)
210 {
211     PIIX4PMState *s = opaque;
212     int ret, i;
213     uint16_t temp;
214 
215     ret = pci_device_load(PCI_DEVICE(s), f);
216     if (ret < 0) {
217         return ret;
218     }
219     qemu_get_be16s(f, &s->ar.pm1.evt.sts);
220     qemu_get_be16s(f, &s->ar.pm1.evt.en);
221     qemu_get_be16s(f, &s->ar.pm1.cnt.cnt);
222 
223     ret = vmstate_load_state(f, &vmstate_apm, &s->apm, 1);
224     if (ret) {
225         return ret;
226     }
227 
228     timer_get(f, s->ar.tmr.timer);
229     qemu_get_sbe64s(f, &s->ar.tmr.overflow_time);
230 
231     qemu_get_be16s(f, (uint16_t *)s->ar.gpe.sts);
232     for (i = 0; i < 3; i++) {
233         qemu_get_be16s(f, &temp);
234     }
235 
236     qemu_get_be16s(f, (uint16_t *)s->ar.gpe.en);
237     for (i = 0; i < 3; i++) {
238         qemu_get_be16s(f, &temp);
239     }
240 
241     ret = vmstate_load_state(f, &vmstate_pci_status,
242         &s->acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT], 1);
243     return ret;
244 }
245 
246 static bool vmstate_test_use_acpi_pci_hotplug(void *opaque, int version_id)
247 {
248     PIIX4PMState *s = opaque;
249     return s->use_acpi_pci_hotplug;
250 }
251 
252 static bool vmstate_test_no_use_acpi_pci_hotplug(void *opaque, int version_id)
253 {
254     PIIX4PMState *s = opaque;
255     return !s->use_acpi_pci_hotplug;
256 }
257 
258 static bool vmstate_test_use_memhp(void *opaque)
259 {
260     PIIX4PMState *s = opaque;
261     return s->acpi_memory_hotplug.is_enabled;
262 }
263 
264 static const VMStateDescription vmstate_memhp_state = {
265     .name = "piix4_pm/memhp",
266     .version_id = 1,
267     .minimum_version_id = 1,
268     .minimum_version_id_old = 1,
269     .needed = vmstate_test_use_memhp,
270     .fields      = (VMStateField[]) {
271         VMSTATE_MEMORY_HOTPLUG(acpi_memory_hotplug, PIIX4PMState),
272         VMSTATE_END_OF_LIST()
273     }
274 };
275 
276 static bool vmstate_test_use_cpuhp(void *opaque)
277 {
278     PIIX4PMState *s = opaque;
279     return !s->cpu_hotplug_legacy;
280 }
281 
282 static int vmstate_cpuhp_pre_load(void *opaque)
283 {
284     Object *obj = OBJECT(opaque);
285     object_property_set_bool(obj, false, "cpu-hotplug-legacy", &error_abort);
286     return 0;
287 }
288 
289 static const VMStateDescription vmstate_cpuhp_state = {
290     .name = "piix4_pm/cpuhp",
291     .version_id = 1,
292     .minimum_version_id = 1,
293     .minimum_version_id_old = 1,
294     .needed = vmstate_test_use_cpuhp,
295     .pre_load = vmstate_cpuhp_pre_load,
296     .fields      = (VMStateField[]) {
297         VMSTATE_CPU_HOTPLUG(cpuhp_state, PIIX4PMState),
298         VMSTATE_END_OF_LIST()
299     }
300 };
301 
302 static bool piix4_vmstate_need_smbus(void *opaque, int version_id)
303 {
304     return pm_smbus_vmstate_needed();
305 }
306 
307 /* qemu-kvm 1.2 uses version 3 but advertised as 2
308  * To support incoming qemu-kvm 1.2 migration, change version_id
309  * and minimum_version_id to 2 below (which breaks migration from
310  * qemu 1.2).
311  *
312  */
313 static const VMStateDescription vmstate_acpi = {
314     .name = "piix4_pm",
315     .version_id = 3,
316     .minimum_version_id = 3,
317     .minimum_version_id_old = 1,
318     .load_state_old = acpi_load_old,
319     .post_load = vmstate_acpi_post_load,
320     .fields = (VMStateField[]) {
321         VMSTATE_PCI_DEVICE(parent_obj, PIIX4PMState),
322         VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState),
323         VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
324         VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
325         VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
326         VMSTATE_STRUCT_TEST(smb, PIIX4PMState, piix4_vmstate_need_smbus, 3,
327                             pmsmb_vmstate, PMSMBus),
328         VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
329         VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
330         VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
331         VMSTATE_STRUCT_TEST(
332             acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT],
333             PIIX4PMState,
334             vmstate_test_no_use_acpi_pci_hotplug,
335             2, vmstate_pci_status,
336             struct AcpiPciHpPciStatus),
337         VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState,
338                             vmstate_test_use_acpi_pci_hotplug),
339         VMSTATE_END_OF_LIST()
340     },
341     .subsections = (const VMStateDescription*[]) {
342          &vmstate_memhp_state,
343          &vmstate_cpuhp_state,
344          NULL
345     }
346 };
347 
348 static void piix4_reset(void *opaque)
349 {
350     PIIX4PMState *s = opaque;
351     PCIDevice *d = PCI_DEVICE(s);
352     uint8_t *pci_conf = d->config;
353 
354     pci_conf[0x58] = 0;
355     pci_conf[0x59] = 0;
356     pci_conf[0x5a] = 0;
357     pci_conf[0x5b] = 0;
358 
359     pci_conf[0x40] = 0x01; /* PM io base read only bit */
360     pci_conf[0x80] = 0;
361 
362     if (!s->smm_enabled) {
363         /* Mark SMM as already inited (until KVM supports SMM). */
364         pci_conf[0x5B] = 0x02;
365     }
366     pm_io_space_update(s);
367     acpi_pcihp_reset(&s->acpi_pci_hotplug);
368 }
369 
370 static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
371 {
372     PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier);
373 
374     assert(s != NULL);
375     acpi_pm1_evt_power_down(&s->ar);
376 }
377 
378 static void piix4_device_pre_plug_cb(HotplugHandler *hotplug_dev,
379                                     DeviceState *dev, Error **errp)
380 {
381     PIIX4PMState *s = PIIX4_PM(hotplug_dev);
382 
383     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
384         acpi_pcihp_device_pre_plug_cb(hotplug_dev, dev, errp);
385     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
386         if (!s->acpi_memory_hotplug.is_enabled) {
387             error_setg(errp,
388                 "memory hotplug is not enabled: %s.memory-hotplug-support "
389                 "is not set", object_get_typename(OBJECT(s)));
390         }
391     } else if (
392                !object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
393         error_setg(errp, "acpi: device pre plug request for not supported"
394                    " device type: %s", object_get_typename(OBJECT(dev)));
395     }
396 }
397 
398 static void piix4_device_plug_cb(HotplugHandler *hotplug_dev,
399                                  DeviceState *dev, Error **errp)
400 {
401     PIIX4PMState *s = PIIX4_PM(hotplug_dev);
402 
403     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
404         if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
405             nvdimm_acpi_plug_cb(hotplug_dev, dev);
406         } else {
407             acpi_memory_plug_cb(hotplug_dev, &s->acpi_memory_hotplug,
408                                 dev, errp);
409         }
410     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
411         acpi_pcihp_device_plug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev, errp);
412     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
413         if (s->cpu_hotplug_legacy) {
414             legacy_acpi_cpu_plug_cb(hotplug_dev, &s->gpe_cpu, dev, errp);
415         } else {
416             acpi_cpu_plug_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
417         }
418     } else {
419         g_assert_not_reached();
420     }
421 }
422 
423 static void piix4_device_unplug_request_cb(HotplugHandler *hotplug_dev,
424                                            DeviceState *dev, Error **errp)
425 {
426     PIIX4PMState *s = PIIX4_PM(hotplug_dev);
427 
428     if (s->acpi_memory_hotplug.is_enabled &&
429         object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
430         acpi_memory_unplug_request_cb(hotplug_dev, &s->acpi_memory_hotplug,
431                                       dev, errp);
432     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
433         acpi_pcihp_device_unplug_request_cb(hotplug_dev, &s->acpi_pci_hotplug,
434                                             dev, errp);
435     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
436                !s->cpu_hotplug_legacy) {
437         acpi_cpu_unplug_request_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
438     } else {
439         error_setg(errp, "acpi: device unplug request for not supported device"
440                    " type: %s", object_get_typename(OBJECT(dev)));
441     }
442 }
443 
444 static void piix4_device_unplug_cb(HotplugHandler *hotplug_dev,
445                                    DeviceState *dev, Error **errp)
446 {
447     PIIX4PMState *s = PIIX4_PM(hotplug_dev);
448 
449     if (s->acpi_memory_hotplug.is_enabled &&
450         object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
451         acpi_memory_unplug_cb(&s->acpi_memory_hotplug, dev, errp);
452     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
453         acpi_pcihp_device_unplug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
454                                     errp);
455     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
456                !s->cpu_hotplug_legacy) {
457         acpi_cpu_unplug_cb(&s->cpuhp_state, dev, errp);
458     } else {
459         error_setg(errp, "acpi: device unplug for not supported device"
460                    " type: %s", object_get_typename(OBJECT(dev)));
461     }
462 }
463 
464 static void piix4_pm_machine_ready(Notifier *n, void *opaque)
465 {
466     PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready);
467     PCIDevice *d = PCI_DEVICE(s);
468     MemoryRegion *io_as = pci_address_space_io(d);
469     uint8_t *pci_conf;
470 
471     pci_conf = d->config;
472     pci_conf[0x5f] = 0x10 |
473         (memory_region_present(io_as, 0x378) ? 0x80 : 0);
474     pci_conf[0x63] = 0x60;
475     pci_conf[0x67] = (memory_region_present(io_as, 0x3f8) ? 0x08 : 0) |
476         (memory_region_present(io_as, 0x2f8) ? 0x90 : 0);
477 }
478 
479 static void piix4_pm_add_propeties(PIIX4PMState *s)
480 {
481     static const uint8_t acpi_enable_cmd = ACPI_ENABLE;
482     static const uint8_t acpi_disable_cmd = ACPI_DISABLE;
483     static const uint32_t gpe0_blk = GPE_BASE;
484     static const uint32_t gpe0_blk_len = GPE_LEN;
485     static const uint16_t sci_int = 9;
486 
487     object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_ENABLE_CMD,
488                                   &acpi_enable_cmd, NULL);
489     object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_DISABLE_CMD,
490                                   &acpi_disable_cmd, NULL);
491     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK,
492                                   &gpe0_blk, NULL);
493     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK_LEN,
494                                   &gpe0_blk_len, NULL);
495     object_property_add_uint16_ptr(OBJECT(s), ACPI_PM_PROP_SCI_INT,
496                                   &sci_int, NULL);
497     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_PM_IO_BASE,
498                                   &s->io_base, NULL);
499 }
500 
501 static void piix4_pm_realize(PCIDevice *dev, Error **errp)
502 {
503     PIIX4PMState *s = PIIX4_PM(dev);
504     uint8_t *pci_conf;
505 
506     pci_conf = dev->config;
507     pci_conf[0x06] = 0x80;
508     pci_conf[0x07] = 0x02;
509     pci_conf[0x09] = 0x00;
510     pci_conf[0x3d] = 0x01; // interrupt pin 1
511 
512     /* APM */
513     apm_init(dev, &s->apm, apm_ctrl_changed, s);
514 
515     if (!s->smm_enabled) {
516         /* Mark SMM as already inited to prevent SMM from running.  KVM does not
517          * support SMM mode. */
518         pci_conf[0x5B] = 0x02;
519     }
520 
521     /* XXX: which specification is used ? The i82731AB has different
522        mappings */
523     pci_conf[0x90] = s->smb_io_base | 1;
524     pci_conf[0x91] = s->smb_io_base >> 8;
525     pci_conf[0xd2] = 0x09;
526     pm_smbus_init(DEVICE(dev), &s->smb, true);
527     memory_region_set_enabled(&s->smb.io, pci_conf[0xd2] & 1);
528     memory_region_add_subregion(pci_address_space_io(dev),
529                                 s->smb_io_base, &s->smb.io);
530 
531     memory_region_init(&s->io, OBJECT(s), "piix4-pm", 64);
532     memory_region_set_enabled(&s->io, false);
533     memory_region_add_subregion(pci_address_space_io(dev),
534                                 0, &s->io);
535 
536     acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
537     acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io);
538     acpi_pm1_cnt_init(&s->ar, &s->io, s->disable_s3, s->disable_s4, s->s4_val);
539     acpi_gpe_init(&s->ar, GPE_LEN);
540 
541     s->powerdown_notifier.notify = piix4_pm_powerdown_req;
542     qemu_register_powerdown_notifier(&s->powerdown_notifier);
543 
544     s->machine_ready.notify = piix4_pm_machine_ready;
545     qemu_add_machine_init_done_notifier(&s->machine_ready);
546     qemu_register_reset(piix4_reset, s);
547 
548     piix4_acpi_system_hot_add_init(pci_address_space_io(dev),
549                                    pci_get_bus(dev), s);
550     qbus_set_hotplug_handler(BUS(pci_get_bus(dev)), OBJECT(s), &error_abort);
551 
552     piix4_pm_add_propeties(s);
553 }
554 
555 I2CBus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
556                       qemu_irq sci_irq, qemu_irq smi_irq,
557                       int smm_enabled, DeviceState **piix4_pm)
558 {
559     DeviceState *dev;
560     PIIX4PMState *s;
561 
562     dev = DEVICE(pci_create(bus, devfn, TYPE_PIIX4_PM));
563     qdev_prop_set_uint32(dev, "smb_io_base", smb_io_base);
564     if (piix4_pm) {
565         *piix4_pm = dev;
566     }
567 
568     s = PIIX4_PM(dev);
569     s->irq = sci_irq;
570     s->smi_irq = smi_irq;
571     s->smm_enabled = smm_enabled;
572     if (xen_enabled()) {
573         s->use_acpi_pci_hotplug = false;
574     }
575 
576     qdev_init_nofail(dev);
577 
578     return s->smb.smbus;
579 }
580 
581 static uint64_t gpe_readb(void *opaque, hwaddr addr, unsigned width)
582 {
583     PIIX4PMState *s = opaque;
584     uint32_t val = acpi_gpe_ioport_readb(&s->ar, addr);
585 
586     PIIX4_DPRINTF("gpe read %" HWADDR_PRIx " == %" PRIu32 "\n", addr, val);
587     return val;
588 }
589 
590 static void gpe_writeb(void *opaque, hwaddr addr, uint64_t val,
591                        unsigned width)
592 {
593     PIIX4PMState *s = opaque;
594 
595     acpi_gpe_ioport_writeb(&s->ar, addr, val);
596     acpi_update_sci(&s->ar, s->irq);
597 
598     PIIX4_DPRINTF("gpe write %" HWADDR_PRIx " <== %" PRIu64 "\n", addr, val);
599 }
600 
601 static const MemoryRegionOps piix4_gpe_ops = {
602     .read = gpe_readb,
603     .write = gpe_writeb,
604     .valid.min_access_size = 1,
605     .valid.max_access_size = 4,
606     .impl.min_access_size = 1,
607     .impl.max_access_size = 1,
608     .endianness = DEVICE_LITTLE_ENDIAN,
609 };
610 
611 
612 static bool piix4_get_cpu_hotplug_legacy(Object *obj, Error **errp)
613 {
614     PIIX4PMState *s = PIIX4_PM(obj);
615 
616     return s->cpu_hotplug_legacy;
617 }
618 
619 static void piix4_set_cpu_hotplug_legacy(Object *obj, bool value, Error **errp)
620 {
621     PIIX4PMState *s = PIIX4_PM(obj);
622 
623     assert(!value);
624     if (s->cpu_hotplug_legacy && value == false) {
625         acpi_switch_to_modern_cphp(&s->gpe_cpu, &s->cpuhp_state,
626                                    PIIX4_CPU_HOTPLUG_IO_BASE);
627     }
628     s->cpu_hotplug_legacy = value;
629 }
630 
631 static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
632                                            PCIBus *bus, PIIX4PMState *s)
633 {
634     memory_region_init_io(&s->io_gpe, OBJECT(s), &piix4_gpe_ops, s,
635                           "acpi-gpe0", GPE_LEN);
636     memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
637 
638     acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
639                     s->use_acpi_pci_hotplug);
640 
641     s->cpu_hotplug_legacy = true;
642     object_property_add_bool(OBJECT(s), "cpu-hotplug-legacy",
643                              piix4_get_cpu_hotplug_legacy,
644                              piix4_set_cpu_hotplug_legacy,
645                              NULL);
646     legacy_acpi_cpu_hotplug_init(parent, OBJECT(s), &s->gpe_cpu,
647                                  PIIX4_CPU_HOTPLUG_IO_BASE);
648 
649     if (s->acpi_memory_hotplug.is_enabled) {
650         acpi_memory_hotplug_init(parent, OBJECT(s), &s->acpi_memory_hotplug,
651                                  ACPI_MEMORY_HOTPLUG_BASE);
652     }
653 }
654 
655 static void piix4_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list)
656 {
657     PIIX4PMState *s = PIIX4_PM(adev);
658 
659     acpi_memory_ospm_status(&s->acpi_memory_hotplug, list);
660     if (!s->cpu_hotplug_legacy) {
661         acpi_cpu_ospm_status(&s->cpuhp_state, list);
662     }
663 }
664 
665 static void piix4_send_gpe(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
666 {
667     PIIX4PMState *s = PIIX4_PM(adev);
668 
669     acpi_send_gpe_event(&s->ar, s->irq, ev);
670 }
671 
672 static Property piix4_pm_properties[] = {
673     DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0),
674     DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0),
675     DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_DISABLED, PIIX4PMState, disable_s4, 0),
676     DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
677     DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support", PIIX4PMState,
678                      use_acpi_pci_hotplug, true),
679     DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
680                      acpi_memory_hotplug.is_enabled, true),
681     DEFINE_PROP_END_OF_LIST(),
682 };
683 
684 static void piix4_pm_class_init(ObjectClass *klass, void *data)
685 {
686     DeviceClass *dc = DEVICE_CLASS(klass);
687     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
688     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
689     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(klass);
690 
691     k->realize = piix4_pm_realize;
692     k->config_write = pm_write_config;
693     k->vendor_id = PCI_VENDOR_ID_INTEL;
694     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3;
695     k->revision = 0x03;
696     k->class_id = PCI_CLASS_BRIDGE_OTHER;
697     dc->desc = "PM";
698     dc->vmsd = &vmstate_acpi;
699     dc->props = piix4_pm_properties;
700     /*
701      * Reason: part of PIIX4 southbridge, needs to be wired up,
702      * e.g. by mips_malta_init()
703      */
704     dc->user_creatable = false;
705     dc->hotpluggable = false;
706     hc->pre_plug = piix4_device_pre_plug_cb;
707     hc->plug = piix4_device_plug_cb;
708     hc->unplug_request = piix4_device_unplug_request_cb;
709     hc->unplug = piix4_device_unplug_cb;
710     adevc->ospm_status = piix4_ospm_status;
711     adevc->send_event = piix4_send_gpe;
712     adevc->madt_cpu = pc_madt_cpu_entry;
713 }
714 
715 static const TypeInfo piix4_pm_info = {
716     .name          = TYPE_PIIX4_PM,
717     .parent        = TYPE_PCI_DEVICE,
718     .instance_size = sizeof(PIIX4PMState),
719     .class_init    = piix4_pm_class_init,
720     .interfaces = (InterfaceInfo[]) {
721         { TYPE_HOTPLUG_HANDLER },
722         { TYPE_ACPI_DEVICE_IF },
723         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
724         { }
725     }
726 };
727 
728 static void piix4_pm_register_types(void)
729 {
730     type_register_static(&piix4_pm_info);
731 }
732 
733 type_init(piix4_pm_register_types)
734