Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 20  */
 21 
 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>  /* for acpi_hest_init() */
 37 
 38 #include "internal.h"
 39 
 40 #define _COMPONENT              ACPI_PCI_COMPONENT
 41 ACPI_MODULE_NAME("pci_root");
 42 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
 43 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
 44 static int acpi_pci_root_add(struct acpi_device *device,
 45                              const struct acpi_device_id *not_used);
 46 static void acpi_pci_root_remove(struct acpi_device *device);
 47 
 48 static 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 
 59 static const struct acpi_device_id root_device_ids[] = {
 60         {"PNP0A03", 0},
 61         {"", 0},
 62 };
 63 
 64 static 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 
 74 static DEFINE_MUTEX(osc_lock);
 75 
 76 /**
 77  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 78  * @handle - the ACPI CA node in question.
 79  *
 80  * Note: we could make this API take a struct acpi_device * instead, but
 81  * for now, it's more convenient to operate on an acpi_handle.
 82  */
 83 int 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 }
 98 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
 99 
100 static acpi_status
101 get_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 
120 static 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 
136 struct pci_osc_bit_struct {
137         u32 bit;
138         char *desc;
139 };
140 
141 static 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 
149 static 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 
157 static 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 
173 static 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 
179 static 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 
185 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
186 
187 static 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 
206 static 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                 /* Run _OSC query only with existing controls. */
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 
235 static 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 
245 struct 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 }
258 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
259 
260 struct acpi_handle_node {
261         struct list_head node;
262         acpi_handle handle;
263 };
264 
265 /**
266  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
267  * @handle: the handle in question
268  *
269  * Given an ACPI CA handle, the desired PCI device is located in the
270  * list of PCI devices.
271  *
272  * If the device is found, its reference count is increased and this
273  * function returns a pointer to its data structure.  The caller must
274  * decrement the reference count by calling pci_dev_put().
275  * If no device is found, %NULL is returned.
276  */
277 struct 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          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
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          * Now, walk back down the PCI device tree until we return to our
315          * original handle. Assumes that everything between the PCI root
316          * bridge and the device we're looking for must be a P2P bridge.
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                  * This function may be called for a non-PCI device that has a
335                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
336                  * case pdev->subordinate will be NULL for the parent.
337                  */
338                 if (!pbus) {
339                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
340                         pdev = NULL;
341                         break;
342                 }
343         }
344 out:
345         list_for_each_entry_safe(node, tmp, &device_list, node)
346                 kfree(node);
347 
348         return pdev;
349 }
350 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
351 
352 /**
353  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
354  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
355  * @mask: Mask of _OSC bits to request control of, place to store control mask.
356  * @req: Mask of _OSC bits the control of is essential to the caller.
357  *
358  * Run _OSC query for @mask and if that is successful, compare the returned
359  * mask of control bits with @req.  If all of the @req bits are set in the
360  * returned mask, run _OSC request for it.
361  *
362  * The variable at the @mask address may be modified regardless of whether or
363  * not the function returns success.  On success it will contain the mask of
364  * _OSC bits the BIOS has granted control of, but its contents are meaningless
365  * on failure.
366  **/
367 acpi_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         /* No need to evaluate _OSC if the control was already granted. */
388         if ((root->osc_control_set & ctrl) == ctrl)
389                 goto out;
390 
391         /* Need to check the available controls bits before requesting them. */
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;
416 out:
417         mutex_unlock(&osc_lock);
418         return status;
419 }
420 EXPORT_SYMBOL(acpi_pci_osc_control_set);
421 
422 static 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          * Apple always return failure on _OSC calls when _OSI("Darwin") has
431          * been called successfully. We know the feature set supported by the
432          * platform, so avoid calling _OSC at all
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          * All supported architectures that use ACPI have support for
444          * PCI domains, so we indicate this in _OSC support capabilities.
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                          * We have ASPM control, but the FADT indicates that
494                          * it's unsupported. Leave existing configuration
495                          * intact and prevent the OS from touching it.
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                  * We want to disable ASPM here, but aspm_disabled
508                  * needs to remain in its state from boot so that we
509                  * properly handle PCIe 1.1 devices.  So we set this
510                  * flag here, to defer the action until after the ACPI
511                  * root scan.
512                  */
513                 *no_aspm = 1;
514         }
515 }
516 
517 static 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         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
542         root->secondary.flags = IORESOURCE_BUS;
543         status = try_get_root_bridge_busnr(handle, &root->secondary);
544         if (ACPI_FAILURE(status)) {
545                 /*
546                  * We need both the start and end of the downstream bus range
547                  * to interpret _CBA (MMCONFIG base address), so it really is
548                  * supposed to be in _CRS.  If we don't find it there, all we
549                  * can do is assume [_BBN-0xFF] or [0-0xFF].
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          * TBD: Need PCI interface for enumeration/configuration of roots.
588          */
589 
590         /*
591          * Scan the Root Bridge
592          * --------------------
593          * Must do this prior to any attempt to bind the root device, as the
594          * PCI namespace does not get created until this call is made (and
595          * thus the root bridge's pci_dev does not exist).
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                 acpi_ioapic_add(root);
618         }
619 
620         pci_lock_rescan_remove();
621         pci_bus_add_devices(root->bus);
622         pci_unlock_rescan_remove();
623         return 1;
624 
625 remove_dmar:
626         if (hotadd)
627                 dmar_device_remove(handle);
628 end:
629         kfree(root);
630         return result;
631 }
632 
633 static void acpi_pci_root_remove(struct acpi_device *device)
634 {
635         struct acpi_pci_root *root = acpi_driver_data(device);
636 
637         pci_lock_rescan_remove();
638 
639         pci_stop_root_bus(root->bus);
640 
641         WARN_ON(acpi_ioapic_remove(root));
642 
643         device_set_run_wake(root->bus->bridge, false);
644         pci_acpi_remove_bus_pm_notifier(device);
645 
646         pci_remove_root_bus(root->bus);
647 
648         dmar_device_remove(device->handle);
649 
650         pci_unlock_rescan_remove();
651 
652         kfree(root);
653 }
654 
655 /*
656  * Following code to support acpi_pci_root_create() is copied from
657  * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
658  * and ARM64.
659  */
660 static void acpi_pci_root_validate_resources(struct device *dev,
661                                              struct list_head *resources,
662                                              unsigned long type)
663 {
664         LIST_HEAD(list);
665         struct resource *res1, *res2, *root = NULL;
666         struct resource_entry *tmp, *entry, *entry2;
667 
668         BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
669         root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
670 
671         list_splice_init(resources, &list);
672         resource_list_for_each_entry_safe(entry, tmp, &list) {
673                 bool free = false;
674                 resource_size_t end;
675 
676                 res1 = entry->res;
677                 if (!(res1->flags & type))
678                         goto next;
679 
680                 /* Exclude non-addressable range or non-addressable portion */
681                 end = min(res1->end, root->end);
682                 if (end <= res1->start) {
683                         dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
684                                  res1);
685                         free = true;
686                         goto next;
687                 } else if (res1->end != end) {
688                         dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
689                                  res1, (unsigned long long)end + 1,
690                                  (unsigned long long)res1->end);
691                         res1->end = end;
692                 }
693 
694                 resource_list_for_each_entry(entry2, resources) {
695                         res2 = entry2->res;
696                         if (!(res2->flags & type))
697                                 continue;
698 
699                         /*
700                          * I don't like throwing away windows because then
701                          * our resources no longer match the ACPI _CRS, but
702                          * the kernel resource tree doesn't allow overlaps.
703                          */
704                         if (resource_overlaps(res1, res2)) {
705                                 res2->start = min(res1->start, res2->start);
706                                 res2->end = max(res1->end, res2->end);
707                                 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
708                                          res2, res1);
709                                 free = true;
710                                 goto next;
711                         }
712                 }
713 
714 next:
715                 resource_list_del(entry);
716                 if (free)
717                         resource_list_free_entry(entry);
718                 else
719                         resource_list_add_tail(entry, resources);
720         }
721 }
722 
723 static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
724 {
725 #ifdef PCI_IOBASE
726         struct resource *res = entry->res;
727         resource_size_t cpu_addr = res->start;
728         resource_size_t pci_addr = cpu_addr - entry->offset;
729         resource_size_t length = resource_size(res);
730         unsigned long port;
731 
732         if (pci_register_io_range(cpu_addr, length))
733                 goto err;
734 
735         port = pci_address_to_pio(cpu_addr);
736         if (port == (unsigned long)-1)
737                 goto err;
738 
739         res->start = port;
740         res->end = port + length - 1;
741         entry->offset = port - pci_addr;
742 
743         if (pci_remap_iospace(res, cpu_addr) < 0)
744                 goto err;
745 
746         pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
747         return;
748 err:
749         res->flags |= IORESOURCE_DISABLED;
750 #endif
751 }
752 
753 int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
754 {
755         int ret;
756         struct list_head *list = &info->resources;
757         struct acpi_device *device = info->bridge;
758         struct resource_entry *entry, *tmp;
759         unsigned long flags;
760 
761         flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
762         ret = acpi_dev_get_resources(device, list,
763                                      acpi_dev_filter_resource_type_cb,
764                                      (void *)flags);
765         if (ret < 0)
766                 dev_warn(&device->dev,
767                          "failed to parse _CRS method, error code %d\n", ret);
768         else if (ret == 0)
769                 dev_dbg(&device->dev,
770                         "no IO and memory resources present in _CRS\n");
771         else {
772                 resource_list_for_each_entry_safe(entry, tmp, list) {
773                         if (entry->res->flags & IORESOURCE_IO)
774                                 acpi_pci_root_remap_iospace(entry);
775 
776                         if (entry->res->flags & IORESOURCE_DISABLED)
777                                 resource_list_destroy_entry(entry);
778                         else
779                                 entry->res->name = info->name;
780                 }
781                 acpi_pci_root_validate_resources(&device->dev, list,
782                                                  IORESOURCE_MEM);
783                 acpi_pci_root_validate_resources(&device->dev, list,
784                                                  IORESOURCE_IO);
785         }
786 
787         return ret;
788 }
789 
790 static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
791 {
792         struct resource_entry *entry, *tmp;
793         struct resource *res, *conflict, *root = NULL;
794 
795         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
796                 res = entry->res;
797                 if (res->flags & IORESOURCE_MEM)
798                         root = &iomem_resource;
799                 else if (res->flags & IORESOURCE_IO)
800                         root = &ioport_resource;
801                 else
802                         continue;
803 
804                 /*
805                  * Some legacy x86 host bridge drivers use iomem_resource and
806                  * ioport_resource as default resource pool, skip it.
807                  */
808                 if (res == root)
809                         continue;
810 
811                 conflict = insert_resource_conflict(root, res);
812                 if (conflict) {
813                         dev_info(&info->bridge->dev,
814                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
815                                  res, conflict->name, conflict);
816                         resource_list_destroy_entry(entry);
817                 }
818         }
819 }
820 
821 static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
822 {
823         struct resource *res;
824         struct resource_entry *entry, *tmp;
825 
826         if (!info)
827                 return;
828 
829         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
830                 res = entry->res;
831                 if (res->parent &&
832                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
833                         release_resource(res);
834                 resource_list_destroy_entry(entry);
835         }
836 
837         info->ops->release_info(info);
838 }
839 
840 static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
841 {
842         struct resource *res;
843         struct resource_entry *entry;
844 
845         resource_list_for_each_entry(entry, &bridge->windows) {
846                 res = entry->res;
847                 if (res->flags & IORESOURCE_IO)
848                         pci_unmap_iospace(res);
849                 if (res->parent &&
850                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
851                         release_resource(res);
852         }
853         __acpi_pci_root_release_info(bridge->release_data);
854 }
855 
856 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
857                                      struct acpi_pci_root_ops *ops,
858                                      struct acpi_pci_root_info *info,
859                                      void *sysdata)
860 {
861         int ret, busnum = root->secondary.start;
862         struct acpi_device *device = root->device;
863         int node = acpi_get_node(device->handle);
864         struct pci_bus *bus;
865 
866         info->root = root;
867         info->bridge = device;
868         info->ops = ops;
869         INIT_LIST_HEAD(&info->resources);
870         snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
871                  root->segment, busnum);
872 
873         if (ops->init_info && ops->init_info(info))
874                 goto out_release_info;
875         if (ops->prepare_resources)
876                 ret = ops->prepare_resources(info);
877         else
878                 ret = acpi_pci_probe_root_resources(info);
879         if (ret < 0)
880                 goto out_release_info;
881 
882         pci_acpi_root_add_resources(info);
883         pci_add_resource(&info->resources, &root->secondary);
884         bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
885                                   sysdata, &info->resources);
886         if (!bus)
887                 goto out_release_info;
888 
889         pci_scan_child_bus(bus);
890         pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
891                                     acpi_pci_root_release_info, info);
892         if (node != NUMA_NO_NODE)
893                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
894         return bus;
895 
896 out_release_info:
897         __acpi_pci_root_release_info(info);
898         return NULL;
899 }
900 
901 void __init acpi_pci_root_init(void)
902 {
903         acpi_hest_init();
904         if (acpi_pci_disabled)
905                 return;
906 
907         pci_acpi_crs_quirks();
908         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
909 }
910 

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