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26
27#include "qemu/osdep.h"
28#include "hw/acpi/pcihp.h"
29
30#include "hw/pci-host/i440fx.h"
31#include "hw/pci/pci.h"
32#include "hw/pci/pci_bridge.h"
33#include "hw/pci/pci_host.h"
34#include "hw/pci/pcie_port.h"
35#include "hw/pci-bridge/xio3130_downstream.h"
36#include "hw/i386/acpi-build.h"
37#include "hw/acpi/acpi.h"
38#include "hw/pci/pci_bus.h"
39#include "migration/vmstate.h"
40#include "qapi/error.h"
41#include "qom/qom-qobject.h"
42#include "trace.h"
43
44#define ACPI_PCIHP_SIZE 0x0018
45#define PCI_UP_BASE 0x0000
46#define PCI_DOWN_BASE 0x0004
47#define PCI_EJ_BASE 0x0008
48#define PCI_RMV_BASE 0x000c
49#define PCI_SEL_BASE 0x0010
50#define PCI_AIDX_BASE 0x0014
51
52typedef struct AcpiPciHpFind {
53 int bsel;
54 PCIBus *bus;
55} AcpiPciHpFind;
56
57static gint g_cmp_uint32(gconstpointer a, gconstpointer b, gpointer user_data)
58{
59 return a - b;
60}
61
62static GSequence *pci_acpi_index_list(void)
63{
64 static GSequence *used_acpi_index_list;
65
66 if (!used_acpi_index_list) {
67 used_acpi_index_list = g_sequence_new(NULL);
68 }
69 return used_acpi_index_list;
70}
71
72static int acpi_pcihp_get_bsel(PCIBus *bus)
73{
74 Error *local_err = NULL;
75 uint64_t bsel = object_property_get_uint(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
76 &local_err);
77
78 if (local_err || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
79 if (local_err) {
80 error_free(local_err);
81 }
82 return -1;
83 } else {
84 return bsel;
85 }
86}
87
88
89
90
91static void *acpi_set_bsel(PCIBus *bus, void *opaque)
92{
93 unsigned *bsel_alloc = opaque;
94 unsigned *bus_bsel;
95
96 if (qbus_is_hotpluggable(BUS(bus))) {
97 bus_bsel = g_malloc(sizeof *bus_bsel);
98
99 *bus_bsel = (*bsel_alloc)++;
100 object_property_add_uint32_ptr(OBJECT(bus), ACPI_PCIHP_PROP_BSEL,
101 bus_bsel, OBJ_PROP_FLAG_READ);
102 }
103
104 return bsel_alloc;
105}
106
107static void acpi_set_pci_info(void)
108{
109 static bool bsel_is_set;
110 Object *host = acpi_get_i386_pci_host();
111 PCIBus *bus;
112 unsigned bsel_alloc = ACPI_PCIHP_BSEL_DEFAULT;
113
114 if (bsel_is_set) {
115 return;
116 }
117 bsel_is_set = true;
118
119 if (!host) {
120 return;
121 }
122
123 bus = PCI_HOST_BRIDGE(host)->bus;
124 if (bus) {
125
126 pci_for_each_bus_depth_first(bus, acpi_set_bsel, NULL, &bsel_alloc);
127 }
128}
129
130static void acpi_pcihp_disable_root_bus(void)
131{
132 Object *host = acpi_get_i386_pci_host();
133 PCIBus *bus;
134
135 bus = PCI_HOST_BRIDGE(host)->bus;
136 if (bus && qbus_is_hotpluggable(BUS(bus))) {
137
138 qbus_set_hotplug_handler(BUS(bus), NULL);
139 }
140
141 return;
142}
143
144static void acpi_pcihp_test_hotplug_bus(PCIBus *bus, void *opaque)
145{
146 AcpiPciHpFind *find = opaque;
147 if (find->bsel == acpi_pcihp_get_bsel(bus)) {
148 find->bus = bus;
149 }
150}
151
152static PCIBus *acpi_pcihp_find_hotplug_bus(AcpiPciHpState *s, int bsel)
153{
154 AcpiPciHpFind find = { .bsel = bsel, .bus = NULL };
155
156 if (bsel < 0) {
157 return NULL;
158 }
159
160 pci_for_each_bus(s->root, acpi_pcihp_test_hotplug_bus, &find);
161
162
163
164
165
166 if (!bsel && !find.bus) {
167 find.bus = s->root;
168 }
169
170
171
172
173
174
175
176
177
178
179
180
181 if (find.bus && !qbus_is_hotpluggable(BUS(find.bus))) {
182 find.bus = NULL;
183 }
184 return find.bus;
185}
186
187static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev)
188{
189 PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
190 DeviceClass *dc = DEVICE_GET_CLASS(dev);
191
192
193
194
195
196
197
198
199 return (pc->is_bridge && !dev->qdev.hotplugged) || !dc->hotpluggable ||
200 pci_is_vf(dev);
201}
202
203static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots)
204{
205 HotplugHandler *hotplug_ctrl;
206 BusChild *kid, *next;
207 int slot = ctz32(slots);
208 PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
209
210 trace_acpi_pci_eject_slot(bsel, slot);
211
212 if (!bus || slot > 31) {
213 return;
214 }
215
216
217 s->acpi_pcihp_pci_status[bsel].down &= ~(1U << slot);
218 s->acpi_pcihp_pci_status[bsel].up &= ~(1U << slot);
219
220 QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
221 DeviceState *qdev = kid->child;
222 PCIDevice *dev = PCI_DEVICE(qdev);
223 if (PCI_SLOT(dev->devfn) == slot) {
224 if (!acpi_pcihp_pc_no_hotplug(s, dev)) {
225
226
227
228
229
230
231
232 if (dev->partially_hotplugged) {
233
234
235
236
237
238
239
240 qdev->pending_deleted_event = false;
241 } else {
242 hotplug_ctrl = qdev_get_hotplug_handler(qdev);
243 hotplug_handler_unplug(hotplug_ctrl, qdev, &error_abort);
244 object_unparent(OBJECT(qdev));
245 }
246 }
247 }
248 }
249}
250
251static void acpi_pcihp_update_hotplug_bus(AcpiPciHpState *s, int bsel)
252{
253 BusChild *kid, *next;
254 PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
255
256
257 while (s->acpi_pcihp_pci_status[bsel].down) {
258 acpi_pcihp_eject_slot(s, bsel, s->acpi_pcihp_pci_status[bsel].down);
259 }
260
261 s->acpi_pcihp_pci_status[bsel].hotplug_enable = ~0;
262
263 if (!bus) {
264 return;
265 }
266 QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
267 DeviceState *qdev = kid->child;
268 PCIDevice *pdev = PCI_DEVICE(qdev);
269 int slot = PCI_SLOT(pdev->devfn);
270
271 if (acpi_pcihp_pc_no_hotplug(s, pdev)) {
272 s->acpi_pcihp_pci_status[bsel].hotplug_enable &= ~(1U << slot);
273 }
274 }
275}
276
277static void acpi_pcihp_update(AcpiPciHpState *s)
278{
279 int i;
280
281 for (i = 0; i < ACPI_PCIHP_MAX_HOTPLUG_BUS; ++i) {
282 acpi_pcihp_update_hotplug_bus(s, i);
283 }
284}
285
286void acpi_pcihp_reset(AcpiPciHpState *s, bool acpihp_root_off)
287{
288 if (acpihp_root_off) {
289 acpi_pcihp_disable_root_bus();
290 }
291 acpi_set_pci_info();
292 acpi_pcihp_update(s);
293}
294
295#define ONBOARD_INDEX_MAX (16 * 1024 - 1)
296
297void acpi_pcihp_device_pre_plug_cb(HotplugHandler *hotplug_dev,
298 DeviceState *dev, Error **errp)
299{
300 PCIDevice *pdev = PCI_DEVICE(dev);
301
302
303 if (dev->hotplugged &&
304 acpi_pcihp_get_bsel(pci_get_bus(pdev)) < 0) {
305 error_setg(errp, "Unsupported bus. Bus doesn't have property '"
306 ACPI_PCIHP_PROP_BSEL "' set");
307 return;
308 }
309
310
311
312
313
314
315 if (pdev->acpi_index > ONBOARD_INDEX_MAX) {
316 error_setg(errp, "acpi-index should be less or equal to %u",
317 ONBOARD_INDEX_MAX);
318 return;
319 }
320
321
322
323
324 if (pdev->acpi_index) {
325 GSequence *used_indexes = pci_acpi_index_list();
326
327 if (g_sequence_lookup(used_indexes, GINT_TO_POINTER(pdev->acpi_index),
328 g_cmp_uint32, NULL)) {
329 error_setg(errp, "a PCI device with acpi-index = %" PRIu32
330 " already exist", pdev->acpi_index);
331 return;
332 }
333 g_sequence_insert_sorted(used_indexes,
334 GINT_TO_POINTER(pdev->acpi_index),
335 g_cmp_uint32, NULL);
336 }
337}
338
339void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
340 DeviceState *dev, Error **errp)
341{
342 PCIDevice *pdev = PCI_DEVICE(dev);
343 int slot = PCI_SLOT(pdev->devfn);
344 PCIDevice *bridge;
345 PCIBus *bus;
346 int bsel;
347
348
349
350
351 if (!dev->hotplugged) {
352
353
354
355
356 if (!s->legacy_piix &&
357 object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
358 PCIBus *sec = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
359
360
361 if (object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT) &&
362 !PCIE_SLOT(pdev)->hotplug) {
363 qbus_set_hotplug_handler(BUS(sec), NULL);
364 return;
365 }
366
367 qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev));
368
369 assert(QLIST_EMPTY(&sec->child));
370 }
371
372 return;
373 }
374
375 bus = pci_get_bus(pdev);
376 bridge = pci_bridge_get_device(bus);
377 if (object_dynamic_cast(OBJECT(bridge), TYPE_PCIE_ROOT_PORT) ||
378 object_dynamic_cast(OBJECT(bridge), TYPE_XIO3130_DOWNSTREAM)) {
379 pcie_cap_slot_enable_power(bridge);
380 }
381
382 bsel = acpi_pcihp_get_bsel(bus);
383 g_assert(bsel >= 0);
384 s->acpi_pcihp_pci_status[bsel].up |= (1U << slot);
385 acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
386}
387
388void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
389 DeviceState *dev, Error **errp)
390{
391 PCIDevice *pdev = PCI_DEVICE(dev);
392
393 trace_acpi_pci_unplug(PCI_SLOT(pdev->devfn),
394 acpi_pcihp_get_bsel(pci_get_bus(pdev)));
395
396
397
398
399 if (pdev->acpi_index) {
400 GSequence *used_indexes = pci_acpi_index_list();
401
402 g_sequence_remove(g_sequence_lookup(used_indexes,
403 GINT_TO_POINTER(pdev->acpi_index),
404 g_cmp_uint32, NULL));
405 }
406
407 qdev_unrealize(dev);
408}
409
410void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
411 AcpiPciHpState *s, DeviceState *dev,
412 Error **errp)
413{
414 PCIDevice *pdev = PCI_DEVICE(dev);
415 int slot = PCI_SLOT(pdev->devfn);
416 int bsel = acpi_pcihp_get_bsel(pci_get_bus(pdev));
417
418 trace_acpi_pci_unplug_request(bsel, slot);
419
420 if (bsel < 0) {
421 error_setg(errp, "Unsupported bus. Bus doesn't have property '"
422 ACPI_PCIHP_PROP_BSEL "' set");
423 return;
424 }
425
426
427
428
429
430
431 pdev->qdev.pending_deleted_event = true;
432 s->acpi_pcihp_pci_status[bsel].down |= (1U << slot);
433 acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
434}
435
436static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size)
437{
438 AcpiPciHpState *s = opaque;
439 uint32_t val = 0;
440 int bsel = s->hotplug_select;
441
442 if (bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
443 return 0;
444 }
445
446 switch (addr) {
447 case PCI_UP_BASE:
448 val = s->acpi_pcihp_pci_status[bsel].up;
449 if (!s->legacy_piix) {
450 s->acpi_pcihp_pci_status[bsel].up = 0;
451 }
452 trace_acpi_pci_up_read(val);
453 break;
454 case PCI_DOWN_BASE:
455 val = s->acpi_pcihp_pci_status[bsel].down;
456 trace_acpi_pci_down_read(val);
457 break;
458 case PCI_EJ_BASE:
459 trace_acpi_pci_features_read(val);
460 break;
461 case PCI_RMV_BASE:
462 val = s->acpi_pcihp_pci_status[bsel].hotplug_enable;
463 trace_acpi_pci_rmv_read(val);
464 break;
465 case PCI_SEL_BASE:
466 val = s->hotplug_select;
467 trace_acpi_pci_sel_read(val);
468 break;
469 case PCI_AIDX_BASE:
470 val = s->acpi_index;
471 s->acpi_index = 0;
472 trace_acpi_pci_acpi_index_read(val);
473 break;
474 default:
475 break;
476 }
477
478 return val;
479}
480
481static void pci_write(void *opaque, hwaddr addr, uint64_t data,
482 unsigned int size)
483{
484 int slot;
485 PCIBus *bus;
486 BusChild *kid, *next;
487 AcpiPciHpState *s = opaque;
488
489 s->acpi_index = 0;
490 switch (addr) {
491 case PCI_AIDX_BASE:
492
493
494
495
496 slot = ctz32(data);
497
498 if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
499 break;
500 }
501
502 bus = acpi_pcihp_find_hotplug_bus(s, s->hotplug_select);
503 if (!bus) {
504 break;
505 }
506 QTAILQ_FOREACH_SAFE(kid, &bus->qbus.children, sibling, next) {
507 Object *o = OBJECT(kid->child);
508 PCIDevice *dev = PCI_DEVICE(o);
509 if (PCI_SLOT(dev->devfn) == slot) {
510 s->acpi_index = object_property_get_uint(o, "acpi-index", NULL);
511 break;
512 }
513 }
514 trace_acpi_pci_acpi_index_write(s->hotplug_select, slot, s->acpi_index);
515 break;
516 case PCI_EJ_BASE:
517 if (s->hotplug_select >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
518 break;
519 }
520 acpi_pcihp_eject_slot(s, s->hotplug_select, data);
521 trace_acpi_pci_ej_write(addr, data);
522 break;
523 case PCI_SEL_BASE:
524 s->hotplug_select = s->legacy_piix ? ACPI_PCIHP_BSEL_DEFAULT : data;
525 trace_acpi_pci_sel_write(addr, data);
526 default:
527 break;
528 }
529}
530
531static const MemoryRegionOps acpi_pcihp_io_ops = {
532 .read = pci_read,
533 .write = pci_write,
534 .endianness = DEVICE_LITTLE_ENDIAN,
535 .valid = {
536 .min_access_size = 4,
537 .max_access_size = 4,
538 },
539};
540
541void acpi_pcihp_init(Object *owner, AcpiPciHpState *s, PCIBus *root_bus,
542 MemoryRegion *address_space_io, bool bridges_enabled,
543 uint16_t io_base)
544{
545 s->io_len = ACPI_PCIHP_SIZE;
546 s->io_base = io_base;
547
548 s->root = root_bus;
549 s->legacy_piix = !bridges_enabled;
550
551 memory_region_init_io(&s->io, owner, &acpi_pcihp_io_ops, s,
552 "acpi-pci-hotplug", s->io_len);
553 memory_region_add_subregion(address_space_io, s->io_base, &s->io);
554
555 object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_BASE_PROP, &s->io_base,
556 OBJ_PROP_FLAG_READ);
557 object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_LEN_PROP, &s->io_len,
558 OBJ_PROP_FLAG_READ);
559}
560
561const VMStateDescription vmstate_acpi_pcihp_pci_status = {
562 .name = "acpi_pcihp_pci_status",
563 .version_id = 1,
564 .minimum_version_id = 1,
565 .fields = (VMStateField[]) {
566 VMSTATE_UINT32(up, AcpiPciHpPciStatus),
567 VMSTATE_UINT32(down, AcpiPciHpPciStatus),
568 VMSTATE_END_OF_LIST()
569 }
570};
571