6fc204a524932e97f4a2743ae7076f1e12e86ad8
[muen/linux.git] / 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 <linux/platform_data/x86/apple.h>
37 #include <acpi/apei.h>  /* for acpi_hest_init() */
38
39 #include "internal.h"
40
41 #define _COMPONENT              ACPI_PCI_COMPONENT
42 ACPI_MODULE_NAME("pci_root");
43 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
44 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
45 static int acpi_pci_root_add(struct acpi_device *device,
46                              const struct acpi_device_id *not_used);
47 static void acpi_pci_root_remove(struct acpi_device *device);
48
49 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
50 {
51         acpiphp_check_host_bridge(adev);
52         return 0;
53 }
54
55 #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
56                                 | OSC_PCI_ASPM_SUPPORT \
57                                 | OSC_PCI_CLOCK_PM_SUPPORT \
58                                 | OSC_PCI_MSI_SUPPORT)
59
60 static const struct acpi_device_id root_device_ids[] = {
61         {"PNP0A03", 0},
62         {"", 0},
63 };
64
65 static struct acpi_scan_handler pci_root_handler = {
66         .ids = root_device_ids,
67         .attach = acpi_pci_root_add,
68         .detach = acpi_pci_root_remove,
69         .hotplug = {
70                 .enabled = true,
71                 .scan_dependent = acpi_pci_root_scan_dependent,
72         },
73 };
74
75 static DEFINE_MUTEX(osc_lock);
76
77 /**
78  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
79  * @handle - the ACPI CA node in question.
80  *
81  * Note: we could make this API take a struct acpi_device * instead, but
82  * for now, it's more convenient to operate on an acpi_handle.
83  */
84 int acpi_is_root_bridge(acpi_handle handle)
85 {
86         int ret;
87         struct acpi_device *device;
88
89         ret = acpi_bus_get_device(handle, &device);
90         if (ret)
91                 return 0;
92
93         ret = acpi_match_device_ids(device, root_device_ids);
94         if (ret)
95                 return 0;
96         else
97                 return 1;
98 }
99 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
100
101 static acpi_status
102 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
103 {
104         struct resource *res = data;
105         struct acpi_resource_address64 address;
106         acpi_status status;
107
108         status = acpi_resource_to_address64(resource, &address);
109         if (ACPI_FAILURE(status))
110                 return AE_OK;
111
112         if ((address.address.address_length > 0) &&
113             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
114                 res->start = address.address.minimum;
115                 res->end = address.address.minimum + address.address.address_length - 1;
116         }
117
118         return AE_OK;
119 }
120
121 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
122                                              struct resource *res)
123 {
124         acpi_status status;
125
126         res->start = -1;
127         status =
128             acpi_walk_resources(handle, METHOD_NAME__CRS,
129                                 get_root_bridge_busnr_callback, res);
130         if (ACPI_FAILURE(status))
131                 return status;
132         if (res->start == -1)
133                 return AE_ERROR;
134         return AE_OK;
135 }
136
137 struct pci_osc_bit_struct {
138         u32 bit;
139         char *desc;
140 };
141
142 static struct pci_osc_bit_struct pci_osc_support_bit[] = {
143         { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
144         { OSC_PCI_ASPM_SUPPORT, "ASPM" },
145         { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
146         { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
147         { OSC_PCI_MSI_SUPPORT, "MSI" },
148 };
149
150 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
151         { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
152         { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
153         { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
154         { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
155         { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
156 };
157
158 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
159                             struct pci_osc_bit_struct *table, int size)
160 {
161         char buf[80];
162         int i, len = 0;
163         struct pci_osc_bit_struct *entry;
164
165         buf[0] = '\0';
166         for (i = 0, entry = table; i < size; i++, entry++)
167                 if (word & entry->bit)
168                         len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
169                                         len ? " " : "", entry->desc);
170
171         dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
172 }
173
174 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
175 {
176         decode_osc_bits(root, msg, word, pci_osc_support_bit,
177                         ARRAY_SIZE(pci_osc_support_bit));
178 }
179
180 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
181 {
182         decode_osc_bits(root, msg, word, pci_osc_control_bit,
183                         ARRAY_SIZE(pci_osc_control_bit));
184 }
185
186 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
187
188 static acpi_status acpi_pci_run_osc(acpi_handle handle,
189                                     const u32 *capbuf, u32 *retval)
190 {
191         struct acpi_osc_context context = {
192                 .uuid_str = pci_osc_uuid_str,
193                 .rev = 1,
194                 .cap.length = 12,
195                 .cap.pointer = (void *)capbuf,
196         };
197         acpi_status status;
198
199         status = acpi_run_osc(handle, &context);
200         if (ACPI_SUCCESS(status)) {
201                 *retval = *((u32 *)(context.ret.pointer + 8));
202                 kfree(context.ret.pointer);
203         }
204         return status;
205 }
206
207 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
208                                         u32 support,
209                                         u32 *control)
210 {
211         acpi_status status;
212         u32 result, capbuf[3];
213
214         support &= OSC_PCI_SUPPORT_MASKS;
215         support |= root->osc_support_set;
216
217         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
218         capbuf[OSC_SUPPORT_DWORD] = support;
219         if (control) {
220                 *control &= OSC_PCI_CONTROL_MASKS;
221                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
222         } else {
223                 /* Run _OSC query only with existing controls. */
224                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
225         }
226
227         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
228         if (ACPI_SUCCESS(status)) {
229                 root->osc_support_set = support;
230                 if (control)
231                         *control = result;
232         }
233         return status;
234 }
235
236 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
237 {
238         acpi_status status;
239
240         mutex_lock(&osc_lock);
241         status = acpi_pci_query_osc(root, flags, NULL);
242         mutex_unlock(&osc_lock);
243         return status;
244 }
245
246 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
247 {
248         struct acpi_pci_root *root;
249         struct acpi_device *device;
250
251         if (acpi_bus_get_device(handle, &device) ||
252             acpi_match_device_ids(device, root_device_ids))
253                 return NULL;
254
255         root = acpi_driver_data(device);
256
257         return root;
258 }
259 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
260
261 struct acpi_handle_node {
262         struct list_head node;
263         acpi_handle handle;
264 };
265
266 /**
267  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
268  * @handle: the handle in question
269  *
270  * Given an ACPI CA handle, the desired PCI device is located in the
271  * list of PCI devices.
272  *
273  * If the device is found, its reference count is increased and this
274  * function returns a pointer to its data structure.  The caller must
275  * decrement the reference count by calling pci_dev_put().
276  * If no device is found, %NULL is returned.
277  */
278 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
279 {
280         int dev, fn;
281         unsigned long long adr;
282         acpi_status status;
283         acpi_handle phandle;
284         struct pci_bus *pbus;
285         struct pci_dev *pdev = NULL;
286         struct acpi_handle_node *node, *tmp;
287         struct acpi_pci_root *root;
288         LIST_HEAD(device_list);
289
290         /*
291          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
292          */
293         phandle = handle;
294         while (!acpi_is_root_bridge(phandle)) {
295                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
296                 if (!node)
297                         goto out;
298
299                 INIT_LIST_HEAD(&node->node);
300                 node->handle = phandle;
301                 list_add(&node->node, &device_list);
302
303                 status = acpi_get_parent(phandle, &phandle);
304                 if (ACPI_FAILURE(status))
305                         goto out;
306         }
307
308         root = acpi_pci_find_root(phandle);
309         if (!root)
310                 goto out;
311
312         pbus = root->bus;
313
314         /*
315          * Now, walk back down the PCI device tree until we return to our
316          * original handle. Assumes that everything between the PCI root
317          * bridge and the device we're looking for must be a P2P bridge.
318          */
319         list_for_each_entry(node, &device_list, node) {
320                 acpi_handle hnd = node->handle;
321                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
322                 if (ACPI_FAILURE(status))
323                         goto out;
324                 dev = (adr >> 16) & 0xffff;
325                 fn  = adr & 0xffff;
326
327                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
328                 if (!pdev || hnd == handle)
329                         break;
330
331                 pbus = pdev->subordinate;
332                 pci_dev_put(pdev);
333
334                 /*
335                  * This function may be called for a non-PCI device that has a
336                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
337                  * case pdev->subordinate will be NULL for the parent.
338                  */
339                 if (!pbus) {
340                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
341                         pdev = NULL;
342                         break;
343                 }
344         }
345 out:
346         list_for_each_entry_safe(node, tmp, &device_list, node)
347                 kfree(node);
348
349         return pdev;
350 }
351 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
352
353 /**
354  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
355  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
356  * @mask: Mask of _OSC bits to request control of, place to store control mask.
357  * @req: Mask of _OSC bits the control of is essential to the caller.
358  *
359  * Run _OSC query for @mask and if that is successful, compare the returned
360  * mask of control bits with @req.  If all of the @req bits are set in the
361  * returned mask, run _OSC request for it.
362  *
363  * The variable at the @mask address may be modified regardless of whether or
364  * not the function returns success.  On success it will contain the mask of
365  * _OSC bits the BIOS has granted control of, but its contents are meaningless
366  * on failure.
367  **/
368 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
369 {
370         struct acpi_pci_root *root;
371         acpi_status status = AE_OK;
372         u32 ctrl, capbuf[3];
373
374         if (!mask)
375                 return AE_BAD_PARAMETER;
376
377         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
378         if ((ctrl & req) != req)
379                 return AE_TYPE;
380
381         root = acpi_pci_find_root(handle);
382         if (!root)
383                 return AE_NOT_EXIST;
384
385         mutex_lock(&osc_lock);
386
387         *mask = ctrl | root->osc_control_set;
388         /* No need to evaluate _OSC if the control was already granted. */
389         if ((root->osc_control_set & ctrl) == ctrl)
390                 goto out;
391
392         /* Need to check the available controls bits before requesting them. */
393         while (*mask) {
394                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
395                 if (ACPI_FAILURE(status))
396                         goto out;
397                 if (ctrl == *mask)
398                         break;
399                 decode_osc_control(root, "platform does not support",
400                                    ctrl & ~(*mask));
401                 ctrl = *mask;
402         }
403
404         if ((ctrl & req) != req) {
405                 decode_osc_control(root, "not requesting control; platform does not support",
406                                    req & ~(ctrl));
407                 status = AE_SUPPORT;
408                 goto out;
409         }
410
411         capbuf[OSC_QUERY_DWORD] = 0;
412         capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
413         capbuf[OSC_CONTROL_DWORD] = ctrl;
414         status = acpi_pci_run_osc(handle, capbuf, mask);
415         if (ACPI_SUCCESS(status))
416                 root->osc_control_set = *mask;
417 out:
418         mutex_unlock(&osc_lock);
419         return status;
420 }
421 EXPORT_SYMBOL(acpi_pci_osc_control_set);
422
423 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
424 {
425         u32 support, control, requested;
426         acpi_status status;
427         struct acpi_device *device = root->device;
428         acpi_handle handle = device->handle;
429
430         /*
431          * Apple always return failure on _OSC calls when _OSI("Darwin") has
432          * been called successfully. We know the feature set supported by the
433          * platform, so avoid calling _OSC at all
434          */
435         if (x86_apple_machine) {
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_RUNNING;
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         device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid);
612
613         if (hotadd) {
614                 pcibios_resource_survey_bus(root->bus);
615                 pci_assign_unassigned_root_bus_resources(root->bus);
616                 /*
617                  * This is only called for the hotadd case. For the boot-time
618                  * case, we need to wait until after PCI initialization in
619                  * order to deal with IOAPICs mapped in on a PCI BAR.
620                  *
621                  * This is currently x86-specific, because acpi_ioapic_add()
622                  * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC.
623                  * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC
624                  * (see drivers/acpi/Kconfig).
625                  */
626                 acpi_ioapic_add(root->device->handle);
627         }
628
629         pci_lock_rescan_remove();
630         pci_bus_add_devices(root->bus);
631         pci_unlock_rescan_remove();
632         return 1;
633
634 remove_dmar:
635         if (hotadd)
636                 dmar_device_remove(handle);
637 end:
638         kfree(root);
639         return result;
640 }
641
642 static void acpi_pci_root_remove(struct acpi_device *device)
643 {
644         struct acpi_pci_root *root = acpi_driver_data(device);
645
646         pci_lock_rescan_remove();
647
648         pci_stop_root_bus(root->bus);
649
650         pci_ioapic_remove(root);
651         device_set_wakeup_capable(root->bus->bridge, false);
652         pci_acpi_remove_bus_pm_notifier(device);
653
654         pci_remove_root_bus(root->bus);
655         WARN_ON(acpi_ioapic_remove(root));
656
657         dmar_device_remove(device->handle);
658
659         pci_unlock_rescan_remove();
660
661         kfree(root);
662 }
663
664 /*
665  * Following code to support acpi_pci_root_create() is copied from
666  * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
667  * and ARM64.
668  */
669 static void acpi_pci_root_validate_resources(struct device *dev,
670                                              struct list_head *resources,
671                                              unsigned long type)
672 {
673         LIST_HEAD(list);
674         struct resource *res1, *res2, *root = NULL;
675         struct resource_entry *tmp, *entry, *entry2;
676
677         BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
678         root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
679
680         list_splice_init(resources, &list);
681         resource_list_for_each_entry_safe(entry, tmp, &list) {
682                 bool free = false;
683                 resource_size_t end;
684
685                 res1 = entry->res;
686                 if (!(res1->flags & type))
687                         goto next;
688
689                 /* Exclude non-addressable range or non-addressable portion */
690                 end = min(res1->end, root->end);
691                 if (end <= res1->start) {
692                         dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
693                                  res1);
694                         free = true;
695                         goto next;
696                 } else if (res1->end != end) {
697                         dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
698                                  res1, (unsigned long long)end + 1,
699                                  (unsigned long long)res1->end);
700                         res1->end = end;
701                 }
702
703                 resource_list_for_each_entry(entry2, resources) {
704                         res2 = entry2->res;
705                         if (!(res2->flags & type))
706                                 continue;
707
708                         /*
709                          * I don't like throwing away windows because then
710                          * our resources no longer match the ACPI _CRS, but
711                          * the kernel resource tree doesn't allow overlaps.
712                          */
713                         if (resource_overlaps(res1, res2)) {
714                                 res2->start = min(res1->start, res2->start);
715                                 res2->end = max(res1->end, res2->end);
716                                 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
717                                          res2, res1);
718                                 free = true;
719                                 goto next;
720                         }
721                 }
722
723 next:
724                 resource_list_del(entry);
725                 if (free)
726                         resource_list_free_entry(entry);
727                 else
728                         resource_list_add_tail(entry, resources);
729         }
730 }
731
732 static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
733 {
734 #ifdef PCI_IOBASE
735         struct resource *res = entry->res;
736         resource_size_t cpu_addr = res->start;
737         resource_size_t pci_addr = cpu_addr - entry->offset;
738         resource_size_t length = resource_size(res);
739         unsigned long port;
740
741         if (pci_register_io_range(cpu_addr, length))
742                 goto err;
743
744         port = pci_address_to_pio(cpu_addr);
745         if (port == (unsigned long)-1)
746                 goto err;
747
748         res->start = port;
749         res->end = port + length - 1;
750         entry->offset = port - pci_addr;
751
752         if (pci_remap_iospace(res, cpu_addr) < 0)
753                 goto err;
754
755         pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
756         return;
757 err:
758         res->flags |= IORESOURCE_DISABLED;
759 #endif
760 }
761
762 int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
763 {
764         int ret;
765         struct list_head *list = &info->resources;
766         struct acpi_device *device = info->bridge;
767         struct resource_entry *entry, *tmp;
768         unsigned long flags;
769
770         flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
771         ret = acpi_dev_get_resources(device, list,
772                                      acpi_dev_filter_resource_type_cb,
773                                      (void *)flags);
774         if (ret < 0)
775                 dev_warn(&device->dev,
776                          "failed to parse _CRS method, error code %d\n", ret);
777         else if (ret == 0)
778                 dev_dbg(&device->dev,
779                         "no IO and memory resources present in _CRS\n");
780         else {
781                 resource_list_for_each_entry_safe(entry, tmp, list) {
782                         if (entry->res->flags & IORESOURCE_IO)
783                                 acpi_pci_root_remap_iospace(entry);
784
785                         if (entry->res->flags & IORESOURCE_DISABLED)
786                                 resource_list_destroy_entry(entry);
787                         else
788                                 entry->res->name = info->name;
789                 }
790                 acpi_pci_root_validate_resources(&device->dev, list,
791                                                  IORESOURCE_MEM);
792                 acpi_pci_root_validate_resources(&device->dev, list,
793                                                  IORESOURCE_IO);
794         }
795
796         return ret;
797 }
798
799 static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
800 {
801         struct resource_entry *entry, *tmp;
802         struct resource *res, *conflict, *root = NULL;
803
804         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
805                 res = entry->res;
806                 if (res->flags & IORESOURCE_MEM)
807                         root = &iomem_resource;
808                 else if (res->flags & IORESOURCE_IO)
809                         root = &ioport_resource;
810                 else
811                         continue;
812
813                 /*
814                  * Some legacy x86 host bridge drivers use iomem_resource and
815                  * ioport_resource as default resource pool, skip it.
816                  */
817                 if (res == root)
818                         continue;
819
820                 conflict = insert_resource_conflict(root, res);
821                 if (conflict) {
822                         dev_info(&info->bridge->dev,
823                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
824                                  res, conflict->name, conflict);
825                         resource_list_destroy_entry(entry);
826                 }
827         }
828 }
829
830 static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
831 {
832         struct resource *res;
833         struct resource_entry *entry, *tmp;
834
835         if (!info)
836                 return;
837
838         resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
839                 res = entry->res;
840                 if (res->parent &&
841                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
842                         release_resource(res);
843                 resource_list_destroy_entry(entry);
844         }
845
846         info->ops->release_info(info);
847 }
848
849 static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
850 {
851         struct resource *res;
852         struct resource_entry *entry;
853
854         resource_list_for_each_entry(entry, &bridge->windows) {
855                 res = entry->res;
856                 if (res->flags & IORESOURCE_IO)
857                         pci_unmap_iospace(res);
858                 if (res->parent &&
859                     (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
860                         release_resource(res);
861         }
862         __acpi_pci_root_release_info(bridge->release_data);
863 }
864
865 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
866                                      struct acpi_pci_root_ops *ops,
867                                      struct acpi_pci_root_info *info,
868                                      void *sysdata)
869 {
870         int ret, busnum = root->secondary.start;
871         struct acpi_device *device = root->device;
872         int node = acpi_get_node(device->handle);
873         struct pci_bus *bus;
874
875         info->root = root;
876         info->bridge = device;
877         info->ops = ops;
878         INIT_LIST_HEAD(&info->resources);
879         snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
880                  root->segment, busnum);
881
882         if (ops->init_info && ops->init_info(info))
883                 goto out_release_info;
884         if (ops->prepare_resources)
885                 ret = ops->prepare_resources(info);
886         else
887                 ret = acpi_pci_probe_root_resources(info);
888         if (ret < 0)
889                 goto out_release_info;
890
891         pci_acpi_root_add_resources(info);
892         pci_add_resource(&info->resources, &root->secondary);
893         bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
894                                   sysdata, &info->resources);
895         if (!bus)
896                 goto out_release_info;
897
898         pci_scan_child_bus(bus);
899         pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
900                                     acpi_pci_root_release_info, info);
901         if (node != NUMA_NO_NODE)
902                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
903         return bus;
904
905 out_release_info:
906         __acpi_pci_root_release_info(info);
907         return NULL;
908 }
909
910 void __init acpi_pci_root_init(void)
911 {
912         acpi_hest_init();
913         if (acpi_pci_disabled)
914                 return;
915
916         pci_acpi_crs_quirks();
917         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
918 }