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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/types.h>
26#include <linux/mutex.h>
27#include <linux/pm.h>
28#include <linux/pm_runtime.h>
29#include <linux/pci.h>
30#include <linux/pci-acpi.h>
31#include <linux/pci-aspm.h>
32#include <linux/dmar.h>
33#include <linux/acpi.h>
34#include <linux/slab.h>
35#include <linux/dmi.h>
36#include <acpi/apei.h>
37
38#include "internal.h"
39
40#define _COMPONENT ACPI_PCI_COMPONENT
41ACPI_MODULE_NAME("pci_root");
42#define ACPI_PCI_ROOT_CLASS "pci_bridge"
43#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
44static int acpi_pci_root_add(struct acpi_device *device,
45 const struct acpi_device_id *not_used);
46static void acpi_pci_root_remove(struct acpi_device *device);
47
48static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
49{
50 acpiphp_check_host_bridge(adev);
51 return 0;
52}
53
54#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
55 | OSC_PCI_ASPM_SUPPORT \
56 | OSC_PCI_CLOCK_PM_SUPPORT \
57 | OSC_PCI_MSI_SUPPORT)
58
59static const struct acpi_device_id root_device_ids[] = {
60 {"PNP0A03", 0},
61 {"", 0},
62};
63
64static struct acpi_scan_handler pci_root_handler = {
65 .ids = root_device_ids,
66 .attach = acpi_pci_root_add,
67 .detach = acpi_pci_root_remove,
68 .hotplug = {
69 .enabled = true,
70 .scan_dependent = acpi_pci_root_scan_dependent,
71 },
72};
73
74static DEFINE_MUTEX(osc_lock);
75
76
77
78
79
80
81
82
83int acpi_is_root_bridge(acpi_handle handle)
84{
85 int ret;
86 struct acpi_device *device;
87
88 ret = acpi_bus_get_device(handle, &device);
89 if (ret)
90 return 0;
91
92 ret = acpi_match_device_ids(device, root_device_ids);
93 if (ret)
94 return 0;
95 else
96 return 1;
97}
98EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
99
100static acpi_status
101get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
102{
103 struct resource *res = data;
104 struct acpi_resource_address64 address;
105 acpi_status status;
106
107 status = acpi_resource_to_address64(resource, &address);
108 if (ACPI_FAILURE(status))
109 return AE_OK;
110
111 if ((address.address.address_length > 0) &&
112 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
113 res->start = address.address.minimum;
114 res->end = address.address.minimum + address.address.address_length - 1;
115 }
116
117 return AE_OK;
118}
119
120static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
121 struct resource *res)
122{
123 acpi_status status;
124
125 res->start = -1;
126 status =
127 acpi_walk_resources(handle, METHOD_NAME__CRS,
128 get_root_bridge_busnr_callback, res);
129 if (ACPI_FAILURE(status))
130 return status;
131 if (res->start == -1)
132 return AE_ERROR;
133 return AE_OK;
134}
135
136struct pci_osc_bit_struct {
137 u32 bit;
138 char *desc;
139};
140
141static struct pci_osc_bit_struct pci_osc_support_bit[] = {
142 { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
143 { OSC_PCI_ASPM_SUPPORT, "ASPM" },
144 { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
145 { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
146 { OSC_PCI_MSI_SUPPORT, "MSI" },
147};
148
149static struct pci_osc_bit_struct pci_osc_control_bit[] = {
150 { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
151 { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
152 { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
153 { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
154 { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
155};
156
157static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
158 struct pci_osc_bit_struct *table, int size)
159{
160 char buf[80];
161 int i, len = 0;
162 struct pci_osc_bit_struct *entry;
163
164 buf[0] = '\0';
165 for (i = 0, entry = table; i < size; i++, entry++)
166 if (word & entry->bit)
167 len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
168 len ? " " : "", entry->desc);
169
170 dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
171}
172
173static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
174{
175 decode_osc_bits(root, msg, word, pci_osc_support_bit,
176 ARRAY_SIZE(pci_osc_support_bit));
177}
178
179static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
180{
181 decode_osc_bits(root, msg, word, pci_osc_control_bit,
182 ARRAY_SIZE(pci_osc_control_bit));
183}
184
185static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
186
187static acpi_status acpi_pci_run_osc(acpi_handle handle,
188 const u32 *capbuf, u32 *retval)
189{
190 struct acpi_osc_context context = {
191 .uuid_str = pci_osc_uuid_str,
192 .rev = 1,
193 .cap.length = 12,
194 .cap.pointer = (void *)capbuf,
195 };
196 acpi_status status;
197
198 status = acpi_run_osc(handle, &context);
199 if (ACPI_SUCCESS(status)) {
200 *retval = *((u32 *)(context.ret.pointer + 8));
201 kfree(context.ret.pointer);
202 }
203 return status;
204}
205
206static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
207 u32 support,
208 u32 *control)
209{
210 acpi_status status;
211 u32 result, capbuf[3];
212
213 support &= OSC_PCI_SUPPORT_MASKS;
214 support |= root->osc_support_set;
215
216 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
217 capbuf[OSC_SUPPORT_DWORD] = support;
218 if (control) {
219 *control &= OSC_PCI_CONTROL_MASKS;
220 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
221 } else {
222
223 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
224 }
225
226 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
227 if (ACPI_SUCCESS(status)) {
228 root->osc_support_set = support;
229 if (control)
230 *control = result;
231 }
232 return status;
233}
234
235static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
236{
237 acpi_status status;
238
239 mutex_lock(&osc_lock);
240 status = acpi_pci_query_osc(root, flags, NULL);
241 mutex_unlock(&osc_lock);
242 return status;
243}
244
245struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
246{
247 struct acpi_pci_root *root;
248 struct acpi_device *device;
249
250 if (acpi_bus_get_device(handle, &device) ||
251 acpi_match_device_ids(device, root_device_ids))
252 return NULL;
253
254 root = acpi_driver_data(device);
255
256 return root;
257}
258EXPORT_SYMBOL_GPL(acpi_pci_find_root);
259
260struct acpi_handle_node {
261 struct list_head node;
262 acpi_handle handle;
263};
264
265
266
267
268
269
270
271
272
273
274
275
276
277struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
278{
279 int dev, fn;
280 unsigned long long adr;
281 acpi_status status;
282 acpi_handle phandle;
283 struct pci_bus *pbus;
284 struct pci_dev *pdev = NULL;
285 struct acpi_handle_node *node, *tmp;
286 struct acpi_pci_root *root;
287 LIST_HEAD(device_list);
288
289
290
291
292 phandle = handle;
293 while (!acpi_is_root_bridge(phandle)) {
294 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
295 if (!node)
296 goto out;
297
298 INIT_LIST_HEAD(&node->node);
299 node->handle = phandle;
300 list_add(&node->node, &device_list);
301
302 status = acpi_get_parent(phandle, &phandle);
303 if (ACPI_FAILURE(status))
304 goto out;
305 }
306
307 root = acpi_pci_find_root(phandle);
308 if (!root)
309 goto out;
310
311 pbus = root->bus;
312
313
314
315
316
317
318 list_for_each_entry(node, &device_list, node) {
319 acpi_handle hnd = node->handle;
320 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
321 if (ACPI_FAILURE(status))
322 goto out;
323 dev = (adr >> 16) & 0xffff;
324 fn = adr & 0xffff;
325
326 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
327 if (!pdev || hnd == handle)
328 break;
329
330 pbus = pdev->subordinate;
331 pci_dev_put(pdev);
332
333
334
335
336
337
338 if (!pbus) {
339 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
340 pdev = NULL;
341 break;
342 }
343 }
344out:
345 list_for_each_entry_safe(node, tmp, &device_list, node)
346 kfree(node);
347
348 return pdev;
349}
350EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
368{
369 struct acpi_pci_root *root;
370 acpi_status status = AE_OK;
371 u32 ctrl, capbuf[3];
372
373 if (!mask)
374 return AE_BAD_PARAMETER;
375
376 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
377 if ((ctrl & req) != req)
378 return AE_TYPE;
379
380 root = acpi_pci_find_root(handle);
381 if (!root)
382 return AE_NOT_EXIST;
383
384 mutex_lock(&osc_lock);
385
386 *mask = ctrl | root->osc_control_set;
387
388 if ((root->osc_control_set & ctrl) == ctrl)
389 goto out;
390
391
392 while (*mask) {
393 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
394 if (ACPI_FAILURE(status))
395 goto out;
396 if (ctrl == *mask)
397 break;
398 decode_osc_control(root, "platform does not support",
399 ctrl & ~(*mask));
400 ctrl = *mask;
401 }
402
403 if ((ctrl & req) != req) {
404 decode_osc_control(root, "not requesting control; platform does not support",
405 req & ~(ctrl));
406 status = AE_SUPPORT;
407 goto out;
408 }
409
410 capbuf[OSC_QUERY_DWORD] = 0;
411 capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
412 capbuf[OSC_CONTROL_DWORD] = ctrl;
413 status = acpi_pci_run_osc(handle, capbuf, mask);
414 if (ACPI_SUCCESS(status))
415 root->osc_control_set = *mask;
416out:
417 mutex_unlock(&osc_lock);
418 return status;
419}
420EXPORT_SYMBOL(acpi_pci_osc_control_set);
421
422static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
423{
424 u32 support, control, requested;
425 acpi_status status;
426 struct acpi_device *device = root->device;
427 acpi_handle handle = device->handle;
428
429
430
431
432
433
434
435 if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
436 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
437 decode_osc_control(root, "OS assumes control of",
438 root->osc_control_set);
439 return;
440 }
441
442
443
444
445
446 support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
447 if (pci_ext_cfg_avail())
448 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
449 if (pcie_aspm_support_enabled())
450 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
451 if (pci_msi_enabled())
452 support |= OSC_PCI_MSI_SUPPORT;
453
454 decode_osc_support(root, "OS supports", support);
455 status = acpi_pci_osc_support(root, support);
456 if (ACPI_FAILURE(status)) {
457 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
458 acpi_format_exception(status));
459 *no_aspm = 1;
460 return;
461 }
462
463 if (pcie_ports_disabled) {
464 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
465 return;
466 }
467
468 if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
469 decode_osc_support(root, "not requesting OS control; OS requires",
470 ACPI_PCIE_REQ_SUPPORT);
471 return;
472 }
473
474 control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
475 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
476 | OSC_PCI_EXPRESS_PME_CONTROL;
477
478 if (pci_aer_available()) {
479 if (aer_acpi_firmware_first())
480 dev_info(&device->dev,
481 "PCIe AER handled by firmware\n");
482 else
483 control |= OSC_PCI_EXPRESS_AER_CONTROL;
484 }
485
486 requested = control;
487 status = acpi_pci_osc_control_set(handle, &control,
488 OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
489 if (ACPI_SUCCESS(status)) {
490 decode_osc_control(root, "OS now controls", control);
491 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
492
493
494
495
496
497 dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
498 *no_aspm = 1;
499 }
500 } else {
501 decode_osc_control(root, "OS requested", requested);
502 decode_osc_control(root, "platform willing to grant", control);
503 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
504 acpi_format_exception(status));
505
506
507
508
509
510
511
512
513 *no_aspm = 1;
514 }
515}
516
517static int acpi_pci_root_add(struct acpi_device *device,
518 const struct acpi_device_id *not_used)
519{
520 unsigned long long segment, bus;
521 acpi_status status;
522 int result;
523 struct acpi_pci_root *root;
524 acpi_handle handle = device->handle;
525 int no_aspm = 0;
526 bool hotadd = system_state != SYSTEM_BOOTING;
527
528 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
529 if (!root)
530 return -ENOMEM;
531
532 segment = 0;
533 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
534 &segment);
535 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
536 dev_err(&device->dev, "can't evaluate _SEG\n");
537 result = -ENODEV;
538 goto end;
539 }
540
541
542 root->secondary.flags = IORESOURCE_BUS;
543 status = try_get_root_bridge_busnr(handle, &root->secondary);
544 if (ACPI_FAILURE(status)) {
545
546
547
548
549
550
551 root->secondary.end = 0xFF;
552 dev_warn(&device->dev,
553 FW_BUG "no secondary bus range in _CRS\n");
554 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
555 NULL, &bus);
556 if (ACPI_SUCCESS(status))
557 root->secondary.start = bus;
558 else if (status == AE_NOT_FOUND)
559 root->secondary.start = 0;
560 else {
561 dev_err(&device->dev, "can't evaluate _BBN\n");
562 result = -ENODEV;
563 goto end;
564 }
565 }
566
567 root->device = device;
568 root->segment = segment & 0xFFFF;
569 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
570 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
571 device->driver_data = root;
572
573 if (hotadd && dmar_device_add(handle)) {
574 result = -ENXIO;
575 goto end;
576 }
577
578 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
579 acpi_device_name(device), acpi_device_bid(device),
580 root->segment, &root->secondary);
581
582 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
583
584 negotiate_os_control(root, &no_aspm);
585
586
587
588
589
590
591
592
593
594
595
596
597 root->bus = pci_acpi_scan_root(root);
598 if (!root->bus) {
599 dev_err(&device->dev,
600 "Bus %04x:%02x not present in PCI namespace\n",
601 root->segment, (unsigned int)root->secondary.start);
602 device->driver_data = NULL;
603 result = -ENODEV;
604 goto remove_dmar;
605 }
606
607 if (no_aspm)
608 pcie_no_aspm();
609
610 pci_acpi_add_bus_pm_notifier(device);
611 if (device->wakeup.flags.run_wake)
612 device_set_run_wake(root->bus->bridge, true);
613
614 if (hotadd) {
615 pcibios_resource_survey_bus(root->bus);
616 pci_assign_unassigned_root_bus_resources(root->bus);
617
618
619
620
621
622
623
624
625
626
627 acpi_ioapic_add(root->device->handle);
628 }
629
630 pci_lock_rescan_remove();
631 pci_bus_add_devices(root->bus);
632 pci_unlock_rescan_remove();
633 return 1;
634
635remove_dmar:
636 if (hotadd)
637 dmar_device_remove(handle);
638end:
639 kfree(root);
640 return result;
641}
642
643static void acpi_pci_root_remove(struct acpi_device *device)
644{
645 struct acpi_pci_root *root = acpi_driver_data(device);
646
647 pci_lock_rescan_remove();
648
649 pci_stop_root_bus(root->bus);
650
651 pci_ioapic_remove(root);
652 device_set_run_wake(root->bus->bridge, false);
653 pci_acpi_remove_bus_pm_notifier(device);
654
655 pci_remove_root_bus(root->bus);
656 WARN_ON(acpi_ioapic_remove(root));
657
658 dmar_device_remove(device->handle);
659
660 pci_unlock_rescan_remove();
661
662 kfree(root);
663}
664
665
666
667
668
669
670static void acpi_pci_root_validate_resources(struct device *dev,
671 struct list_head *resources,
672 unsigned long type)
673{
674 LIST_HEAD(list);
675 struct resource *res1, *res2, *root = NULL;
676 struct resource_entry *tmp, *entry, *entry2;
677
678 BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
679 root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
680
681 list_splice_init(resources, &list);
682 resource_list_for_each_entry_safe(entry, tmp, &list) {
683 bool free = false;
684 resource_size_t end;
685
686 res1 = entry->res;
687 if (!(res1->flags & type))
688 goto next;
689
690
691 end = min(res1->end, root->end);
692 if (end <= res1->start) {
693 dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
694 res1);
695 free = true;
696 goto next;
697 } else if (res1->end != end) {
698 dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
699 res1, (unsigned long long)end + 1,
700 (unsigned long long)res1->end);
701 res1->end = end;
702 }
703
704 resource_list_for_each_entry(entry2, resources) {
705 res2 = entry2->res;
706 if (!(res2->flags & type))
707 continue;
708
709
710
711
712
713
714 if (resource_overlaps(res1, res2)) {
715 res2->start = min(res1->start, res2->start);
716 res2->end = max(res1->end, res2->end);
717 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
718 res2, res1);
719 free = true;
720 goto next;
721 }
722 }
723
724next:
725 resource_list_del(entry);
726 if (free)
727 resource_list_free_entry(entry);
728 else
729 resource_list_add_tail(entry, resources);
730 }
731}
732
733static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
734{
735#ifdef PCI_IOBASE
736 struct resource *res = entry->res;
737 resource_size_t cpu_addr = res->start;
738 resource_size_t pci_addr = cpu_addr - entry->offset;
739 resource_size_t length = resource_size(res);
740 unsigned long port;
741
742 if (pci_register_io_range(cpu_addr, length))
743 goto err;
744
745 port = pci_address_to_pio(cpu_addr);
746 if (port == (unsigned long)-1)
747 goto err;
748
749 res->start = port;
750 res->end = port + length - 1;
751 entry->offset = port - pci_addr;
752
753 if (pci_remap_iospace(res, cpu_addr) < 0)
754 goto err;
755
756 pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
757 return;
758err:
759 res->flags |= IORESOURCE_DISABLED;
760#endif
761}
762
763int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
764{
765 int ret;
766 struct list_head *list = &info->resources;
767 struct acpi_device *device = info->bridge;
768 struct resource_entry *entry, *tmp;
769 unsigned long flags;
770
771 flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
772 ret = acpi_dev_get_resources(device, list,
773 acpi_dev_filter_resource_type_cb,
774 (void *)flags);
775 if (ret < 0)
776 dev_warn(&device->dev,
777 "failed to parse _CRS method, error code %d\n", ret);
778 else if (ret == 0)
779 dev_dbg(&device->dev,
780 "no IO and memory resources present in _CRS\n");
781 else {
782 resource_list_for_each_entry_safe(entry, tmp, list) {
783 if (entry->res->flags & IORESOURCE_IO)
784 acpi_pci_root_remap_iospace(entry);
785
786 if (entry->res->flags & IORESOURCE_DISABLED)
787 resource_list_destroy_entry(entry);
788 else
789 entry->res->name = info->name;
790 }
791 acpi_pci_root_validate_resources(&device->dev, list,
792 IORESOURCE_MEM);
793 acpi_pci_root_validate_resources(&device->dev, list,
794 IORESOURCE_IO);
795 }
796
797 return ret;
798}
799
800static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
801{
802 struct resource_entry *entry, *tmp;
803 struct resource *res, *conflict, *root = NULL;
804
805 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
806 res = entry->res;
807 if (res->flags & IORESOURCE_MEM)
808 root = &iomem_resource;
809 else if (res->flags & IORESOURCE_IO)
810 root = &ioport_resource;
811 else
812 continue;
813
814
815
816
817
818 if (res == root)
819 continue;
820
821 conflict = insert_resource_conflict(root, res);
822 if (conflict) {
823 dev_info(&info->bridge->dev,
824 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
825 res, conflict->name, conflict);
826 resource_list_destroy_entry(entry);
827 }
828 }
829}
830
831static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
832{
833 struct resource *res;
834 struct resource_entry *entry, *tmp;
835
836 if (!info)
837 return;
838
839 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
840 res = entry->res;
841 if (res->parent &&
842 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
843 release_resource(res);
844 resource_list_destroy_entry(entry);
845 }
846
847 info->ops->release_info(info);
848}
849
850static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
851{
852 struct resource *res;
853 struct resource_entry *entry;
854
855 resource_list_for_each_entry(entry, &bridge->windows) {
856 res = entry->res;
857 if (res->flags & IORESOURCE_IO)
858 pci_unmap_iospace(res);
859 if (res->parent &&
860 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
861 release_resource(res);
862 }
863 __acpi_pci_root_release_info(bridge->release_data);
864}
865
866struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
867 struct acpi_pci_root_ops *ops,
868 struct acpi_pci_root_info *info,
869 void *sysdata)
870{
871 int ret, busnum = root->secondary.start;
872 struct acpi_device *device = root->device;
873 int node = acpi_get_node(device->handle);
874 struct pci_bus *bus;
875
876 info->root = root;
877 info->bridge = device;
878 info->ops = ops;
879 INIT_LIST_HEAD(&info->resources);
880 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
881 root->segment, busnum);
882
883 if (ops->init_info && ops->init_info(info))
884 goto out_release_info;
885 if (ops->prepare_resources)
886 ret = ops->prepare_resources(info);
887 else
888 ret = acpi_pci_probe_root_resources(info);
889 if (ret < 0)
890 goto out_release_info;
891
892 pci_acpi_root_add_resources(info);
893 pci_add_resource(&info->resources, &root->secondary);
894 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
895 sysdata, &info->resources);
896 if (!bus)
897 goto out_release_info;
898
899 pci_scan_child_bus(bus);
900 pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
901 acpi_pci_root_release_info, info);
902 if (node != NUMA_NO_NODE)
903 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
904 return bus;
905
906out_release_info:
907 __acpi_pci_root_release_info(info);
908 return NULL;
909}
910
911void __init acpi_pci_root_init(void)
912{
913 acpi_hest_init();
914 if (acpi_pci_disabled)
915 return;
916
917 pci_acpi_crs_quirks();
918 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
919}
920