Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/acpi/pci_root.c

  1 /*
  2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
  3  *
  4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License as published by
 11  *  the Free Software Foundation; either version 2 of the License, or (at
 12  *  your option) any later version.
 13  *
 14  *  This program is distributed in the hope that it will be useful, but
 15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  *  General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License along
 20  *  with this program; if not, write to the Free Software Foundation, Inc.,
 21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/init.h>
 29 #include <linux/types.h>
 30 #include <linux/mutex.h>
 31 #include <linux/pm.h>
 32 #include <linux/pm_runtime.h>
 33 #include <linux/pci.h>
 34 #include <linux/pci-acpi.h>
 35 #include <linux/pci-aspm.h>
 36 #include <linux/acpi.h>
 37 #include <linux/slab.h>
 38 #include <linux/dmi.h>
 39 #include <acpi/apei.h>  /* for acpi_hest_init() */
 40 
 41 #include "internal.h"
 42 
 43 #define _COMPONENT              ACPI_PCI_COMPONENT
 44 ACPI_MODULE_NAME("pci_root");
 45 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
 46 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
 47 static int acpi_pci_root_add(struct acpi_device *device,
 48                              const struct acpi_device_id *not_used);
 49 static void acpi_pci_root_remove(struct acpi_device *device);
 50 
 51 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
 52 {
 53         acpiphp_check_host_bridge(adev);
 54         return 0;
 55 }
 56 
 57 #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
 58                                 | OSC_PCI_ASPM_SUPPORT \
 59                                 | OSC_PCI_CLOCK_PM_SUPPORT \
 60                                 | OSC_PCI_MSI_SUPPORT)
 61 
 62 static const struct acpi_device_id root_device_ids[] = {
 63         {"PNP0A03", 0},
 64         {"", 0},
 65 };
 66 
 67 static struct acpi_scan_handler pci_root_handler = {
 68         .ids = root_device_ids,
 69         .attach = acpi_pci_root_add,
 70         .detach = acpi_pci_root_remove,
 71         .hotplug = {
 72                 .enabled = true,
 73                 .scan_dependent = acpi_pci_root_scan_dependent,
 74         },
 75 };
 76 
 77 static DEFINE_MUTEX(osc_lock);
 78 
 79 /**
 80  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 81  * @handle - the ACPI CA node in question.
 82  *
 83  * Note: we could make this API take a struct acpi_device * instead, but
 84  * for now, it's more convenient to operate on an acpi_handle.
 85  */
 86 int acpi_is_root_bridge(acpi_handle handle)
 87 {
 88         int ret;
 89         struct acpi_device *device;
 90 
 91         ret = acpi_bus_get_device(handle, &device);
 92         if (ret)
 93                 return 0;
 94 
 95         ret = acpi_match_device_ids(device, root_device_ids);
 96         if (ret)
 97                 return 0;
 98         else
 99                 return 1;
100 }
101 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
102 
103 static acpi_status
104 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
105 {
106         struct resource *res = data;
107         struct acpi_resource_address64 address;
108         acpi_status status;
109 
110         status = acpi_resource_to_address64(resource, &address);
111         if (ACPI_FAILURE(status))
112                 return AE_OK;
113 
114         if ((address.address_length > 0) &&
115             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
116                 res->start = address.minimum;
117                 res->end = address.minimum + address.address_length - 1;
118         }
119 
120         return AE_OK;
121 }
122 
123 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
124                                              struct resource *res)
125 {
126         acpi_status status;
127 
128         res->start = -1;
129         status =
130             acpi_walk_resources(handle, METHOD_NAME__CRS,
131                                 get_root_bridge_busnr_callback, res);
132         if (ACPI_FAILURE(status))
133                 return status;
134         if (res->start == -1)
135                 return AE_ERROR;
136         return AE_OK;
137 }
138 
139 struct pci_osc_bit_struct {
140         u32 bit;
141         char *desc;
142 };
143 
144 static struct pci_osc_bit_struct pci_osc_support_bit[] = {
145         { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
146         { OSC_PCI_ASPM_SUPPORT, "ASPM" },
147         { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
148         { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
149         { OSC_PCI_MSI_SUPPORT, "MSI" },
150 };
151 
152 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
153         { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
154         { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
155         { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
156         { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
157         { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
158 };
159 
160 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
161                             struct pci_osc_bit_struct *table, int size)
162 {
163         char buf[80];
164         int i, len = 0;
165         struct pci_osc_bit_struct *entry;
166 
167         buf[0] = '\0';
168         for (i = 0, entry = table; i < size; i++, entry++)
169                 if (word & entry->bit)
170                         len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
171                                         len ? " " : "", entry->desc);
172 
173         dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
174 }
175 
176 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
177 {
178         decode_osc_bits(root, msg, word, pci_osc_support_bit,
179                         ARRAY_SIZE(pci_osc_support_bit));
180 }
181 
182 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
183 {
184         decode_osc_bits(root, msg, word, pci_osc_control_bit,
185                         ARRAY_SIZE(pci_osc_control_bit));
186 }
187 
188 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
189 
190 static acpi_status acpi_pci_run_osc(acpi_handle handle,
191                                     const u32 *capbuf, u32 *retval)
192 {
193         struct acpi_osc_context context = {
194                 .uuid_str = pci_osc_uuid_str,
195                 .rev = 1,
196                 .cap.length = 12,
197                 .cap.pointer = (void *)capbuf,
198         };
199         acpi_status status;
200 
201         status = acpi_run_osc(handle, &context);
202         if (ACPI_SUCCESS(status)) {
203                 *retval = *((u32 *)(context.ret.pointer + 8));
204                 kfree(context.ret.pointer);
205         }
206         return status;
207 }
208 
209 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
210                                         u32 support,
211                                         u32 *control)
212 {
213         acpi_status status;
214         u32 result, capbuf[3];
215 
216         support &= OSC_PCI_SUPPORT_MASKS;
217         support |= root->osc_support_set;
218 
219         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
220         capbuf[OSC_SUPPORT_DWORD] = support;
221         if (control) {
222                 *control &= OSC_PCI_CONTROL_MASKS;
223                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
224         } else {
225                 /* Run _OSC query only with existing controls. */
226                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
227         }
228 
229         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
230         if (ACPI_SUCCESS(status)) {
231                 root->osc_support_set = support;
232                 if (control)
233                         *control = result;
234         }
235         return status;
236 }
237 
238 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
239 {
240         acpi_status status;
241 
242         mutex_lock(&osc_lock);
243         status = acpi_pci_query_osc(root, flags, NULL);
244         mutex_unlock(&osc_lock);
245         return status;
246 }
247 
248 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
249 {
250         struct acpi_pci_root *root;
251         struct acpi_device *device;
252 
253         if (acpi_bus_get_device(handle, &device) ||
254             acpi_match_device_ids(device, root_device_ids))
255                 return NULL;
256 
257         root = acpi_driver_data(device);
258 
259         return root;
260 }
261 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
262 
263 struct acpi_handle_node {
264         struct list_head node;
265         acpi_handle handle;
266 };
267 
268 /**
269  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
270  * @handle: the handle in question
271  *
272  * Given an ACPI CA handle, the desired PCI device is located in the
273  * list of PCI devices.
274  *
275  * If the device is found, its reference count is increased and this
276  * function returns a pointer to its data structure.  The caller must
277  * decrement the reference count by calling pci_dev_put().
278  * If no device is found, %NULL is returned.
279  */
280 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
281 {
282         int dev, fn;
283         unsigned long long adr;
284         acpi_status status;
285         acpi_handle phandle;
286         struct pci_bus *pbus;
287         struct pci_dev *pdev = NULL;
288         struct acpi_handle_node *node, *tmp;
289         struct acpi_pci_root *root;
290         LIST_HEAD(device_list);
291 
292         /*
293          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
294          */
295         phandle = handle;
296         while (!acpi_is_root_bridge(phandle)) {
297                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
298                 if (!node)
299                         goto out;
300 
301                 INIT_LIST_HEAD(&node->node);
302                 node->handle = phandle;
303                 list_add(&node->node, &device_list);
304 
305                 status = acpi_get_parent(phandle, &phandle);
306                 if (ACPI_FAILURE(status))
307                         goto out;
308         }
309 
310         root = acpi_pci_find_root(phandle);
311         if (!root)
312                 goto out;
313 
314         pbus = root->bus;
315 
316         /*
317          * Now, walk back down the PCI device tree until we return to our
318          * original handle. Assumes that everything between the PCI root
319          * bridge and the device we're looking for must be a P2P bridge.
320          */
321         list_for_each_entry(node, &device_list, node) {
322                 acpi_handle hnd = node->handle;
323                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
324                 if (ACPI_FAILURE(status))
325                         goto out;
326                 dev = (adr >> 16) & 0xffff;
327                 fn  = adr & 0xffff;
328 
329                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
330                 if (!pdev || hnd == handle)
331                         break;
332 
333                 pbus = pdev->subordinate;
334                 pci_dev_put(pdev);
335 
336                 /*
337                  * This function may be called for a non-PCI device that has a
338                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
339                  * case pdev->subordinate will be NULL for the parent.
340                  */
341                 if (!pbus) {
342                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
343                         pdev = NULL;
344                         break;
345                 }
346         }
347 out:
348         list_for_each_entry_safe(node, tmp, &device_list, node)
349                 kfree(node);
350 
351         return pdev;
352 }
353 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
354 
355 /**
356  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
357  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
358  * @mask: Mask of _OSC bits to request control of, place to store control mask.
359  * @req: Mask of _OSC bits the control of is essential to the caller.
360  *
361  * Run _OSC query for @mask and if that is successful, compare the returned
362  * mask of control bits with @req.  If all of the @req bits are set in the
363  * returned mask, run _OSC request for it.
364  *
365  * The variable at the @mask address may be modified regardless of whether or
366  * not the function returns success.  On success it will contain the mask of
367  * _OSC bits the BIOS has granted control of, but its contents are meaningless
368  * on failure.
369  **/
370 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
371 {
372         struct acpi_pci_root *root;
373         acpi_status status = AE_OK;
374         u32 ctrl, capbuf[3];
375 
376         if (!mask)
377                 return AE_BAD_PARAMETER;
378 
379         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
380         if ((ctrl & req) != req)
381                 return AE_TYPE;
382 
383         root = acpi_pci_find_root(handle);
384         if (!root)
385                 return AE_NOT_EXIST;
386 
387         mutex_lock(&osc_lock);
388 
389         *mask = ctrl | root->osc_control_set;
390         /* No need to evaluate _OSC if the control was already granted. */
391         if ((root->osc_control_set & ctrl) == ctrl)
392                 goto out;
393 
394         /* Need to check the available controls bits before requesting them. */
395         while (*mask) {
396                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
397                 if (ACPI_FAILURE(status))
398                         goto out;
399                 if (ctrl == *mask)
400                         break;
401                 decode_osc_control(root, "platform does not support",
402                                    ctrl & ~(*mask));
403                 ctrl = *mask;
404         }
405 
406         if ((ctrl & req) != req) {
407                 decode_osc_control(root, "not requesting control; platform does not support",
408                                    req & ~(ctrl));
409                 status = AE_SUPPORT;
410                 goto out;
411         }
412 
413         capbuf[OSC_QUERY_DWORD] = 0;
414         capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
415         capbuf[OSC_CONTROL_DWORD] = ctrl;
416         status = acpi_pci_run_osc(handle, capbuf, mask);
417         if (ACPI_SUCCESS(status))
418                 root->osc_control_set = *mask;
419 out:
420         mutex_unlock(&osc_lock);
421         return status;
422 }
423 EXPORT_SYMBOL(acpi_pci_osc_control_set);
424 
425 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,
426                                  int *clear_aspm)
427 {
428         u32 support, control, requested;
429         acpi_status status;
430         struct acpi_device *device = root->device;
431         acpi_handle handle = device->handle;
432 
433         /*
434          * Apple always return failure on _OSC calls when _OSI("Darwin") has
435          * been called successfully. We know the feature set supported by the
436          * platform, so avoid calling _OSC at all
437          */
438 
439         if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
440                 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
441                 decode_osc_control(root, "OS assumes control of",
442                                    root->osc_control_set);
443                 return;
444         }
445 
446         /*
447          * All supported architectures that use ACPI have support for
448          * PCI domains, so we indicate this in _OSC support capabilities.
449          */
450         support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
451         if (pci_ext_cfg_avail())
452                 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
453         if (pcie_aspm_support_enabled())
454                 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
455         if (pci_msi_enabled())
456                 support |= OSC_PCI_MSI_SUPPORT;
457 
458         decode_osc_support(root, "OS supports", support);
459         status = acpi_pci_osc_support(root, support);
460         if (ACPI_FAILURE(status)) {
461                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
462                          acpi_format_exception(status));
463                 *no_aspm = 1;
464                 return;
465         }
466 
467         if (pcie_ports_disabled) {
468                 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
469                 return;
470         }
471 
472         if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
473                 decode_osc_support(root, "not requesting OS control; OS requires",
474                                    ACPI_PCIE_REQ_SUPPORT);
475                 return;
476         }
477 
478         control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
479                 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
480                 | OSC_PCI_EXPRESS_PME_CONTROL;
481 
482         if (pci_aer_available()) {
483                 if (aer_acpi_firmware_first())
484                         dev_info(&device->dev,
485                                  "PCIe AER handled by firmware\n");
486                 else
487                         control |= OSC_PCI_EXPRESS_AER_CONTROL;
488         }
489 
490         requested = control;
491         status = acpi_pci_osc_control_set(handle, &control,
492                                           OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
493         if (ACPI_SUCCESS(status)) {
494                 decode_osc_control(root, "OS now controls", control);
495                 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
496                         /*
497                          * We have ASPM control, but the FADT indicates
498                          * that it's unsupported. Clear it.
499                          */
500                         *clear_aspm = 1;
501                 }
502         } else {
503                 decode_osc_control(root, "OS requested", requested);
504                 decode_osc_control(root, "platform willing to grant", control);
505                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
506                         acpi_format_exception(status));
507 
508                 /*
509                  * We want to disable ASPM here, but aspm_disabled
510                  * needs to remain in its state from boot so that we
511                  * properly handle PCIe 1.1 devices.  So we set this
512                  * flag here, to defer the action until after the ACPI
513                  * root scan.
514                  */
515                 *no_aspm = 1;
516         }
517 }
518 
519 static int acpi_pci_root_add(struct acpi_device *device,
520                              const struct acpi_device_id *not_used)
521 {
522         unsigned long long segment, bus;
523         acpi_status status;
524         int result;
525         struct acpi_pci_root *root;
526         acpi_handle handle = device->handle;
527         int no_aspm = 0, clear_aspm = 0;
528 
529         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
530         if (!root)
531                 return -ENOMEM;
532 
533         segment = 0;
534         status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
535                                        &segment);
536         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
537                 dev_err(&device->dev,  "can't evaluate _SEG\n");
538                 result = -ENODEV;
539                 goto end;
540         }
541 
542         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
543         root->secondary.flags = IORESOURCE_BUS;
544         status = try_get_root_bridge_busnr(handle, &root->secondary);
545         if (ACPI_FAILURE(status)) {
546                 /*
547                  * We need both the start and end of the downstream bus range
548                  * to interpret _CBA (MMCONFIG base address), so it really is
549                  * supposed to be in _CRS.  If we don't find it there, all we
550                  * can do is assume [_BBN-0xFF] or [0-0xFF].
551                  */
552                 root->secondary.end = 0xFF;
553                 dev_warn(&device->dev,
554                          FW_BUG "no secondary bus range in _CRS\n");
555                 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
556                                                NULL, &bus);
557                 if (ACPI_SUCCESS(status))
558                         root->secondary.start = bus;
559                 else if (status == AE_NOT_FOUND)
560                         root->secondary.start = 0;
561                 else {
562                         dev_err(&device->dev, "can't evaluate _BBN\n");
563                         result = -ENODEV;
564                         goto end;
565                 }
566         }
567 
568         root->device = device;
569         root->segment = segment & 0xFFFF;
570         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
571         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
572         device->driver_data = root;
573 
574         pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
575                acpi_device_name(device), acpi_device_bid(device),
576                root->segment, &root->secondary);
577 
578         root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
579 
580         negotiate_os_control(root, &no_aspm, &clear_aspm);
581 
582         /*
583          * TBD: Need PCI interface for enumeration/configuration of roots.
584          */
585 
586         /*
587          * Scan the Root Bridge
588          * --------------------
589          * Must do this prior to any attempt to bind the root device, as the
590          * PCI namespace does not get created until this call is made (and
591          * thus the root bridge's pci_dev does not exist).
592          */
593         root->bus = pci_acpi_scan_root(root);
594         if (!root->bus) {
595                 dev_err(&device->dev,
596                         "Bus %04x:%02x not present in PCI namespace\n",
597                         root->segment, (unsigned int)root->secondary.start);
598                 device->driver_data = NULL;
599                 result = -ENODEV;
600                 goto end;
601         }
602 
603         if (clear_aspm) {
604                 dev_info(&device->dev, "Disabling ASPM (FADT indicates it is unsupported)\n");
605                 pcie_clear_aspm(root->bus);
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 (system_state != SYSTEM_BOOTING) {
615                 pcibios_resource_survey_bus(root->bus);
616                 pci_assign_unassigned_root_bus_resources(root->bus);
617         }
618 
619         pci_lock_rescan_remove();
620         pci_bus_add_devices(root->bus);
621         pci_unlock_rescan_remove();
622         return 1;
623 
624 end:
625         kfree(root);
626         return result;
627 }
628 
629 static void acpi_pci_root_remove(struct acpi_device *device)
630 {
631         struct acpi_pci_root *root = acpi_driver_data(device);
632 
633         pci_lock_rescan_remove();
634 
635         pci_stop_root_bus(root->bus);
636 
637         device_set_run_wake(root->bus->bridge, false);
638         pci_acpi_remove_bus_pm_notifier(device);
639 
640         pci_remove_root_bus(root->bus);
641 
642         pci_unlock_rescan_remove();
643 
644         kfree(root);
645 }
646 
647 void __init acpi_pci_root_init(void)
648 {
649         acpi_hest_init();
650         if (acpi_pci_disabled)
651                 return;
652 
653         pci_acpi_crs_quirks();
654         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
655 }
656 

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