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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
41ACPI_MODULE_NAME("pci_root");
42#define ACPI_PCI_ROOT_CLASS "pci_bridge"
43#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
44static int acpi_pci_root_add(struct acpi_device *device,
45 const struct acpi_device_id *not_used);
46static void acpi_pci_root_remove(struct acpi_device *device);
47
48static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
49{
50 acpiphp_check_host_bridge(adev);
51 return 0;
52}
53
54#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
55 | OSC_PCI_ASPM_SUPPORT \
56 | OSC_PCI_CLOCK_PM_SUPPORT \
57 | OSC_PCI_MSI_SUPPORT)
58
59static const struct acpi_device_id root_device_ids[] = {
60 {"PNP0A03", 0},
61 {"", 0},
62};
63
64static struct acpi_scan_handler pci_root_handler = {
65 .ids = root_device_ids,
66 .attach = acpi_pci_root_add,
67 .detach = acpi_pci_root_remove,
68 .hotplug = {
69 .enabled = true,
70 .scan_dependent = acpi_pci_root_scan_dependent,
71 },
72};
73
74static DEFINE_MUTEX(osc_lock);
75
76/**
77 * 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 */
83int acpi_is_root_bridge(acpi_handle handle)
84{
85 int ret;
86 struct acpi_device *device;
87
88 ret = acpi_bus_get_device(handle, &device);
89 if (ret)
90 return 0;
91
92 ret = acpi_match_device_ids(device, root_device_ids);
93 if (ret)
94 return 0;
95 else
96 return 1;
97}
98EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
99
100static acpi_status
101get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
102{
103 struct resource *res = data;
104 struct acpi_resource_address64 address;
105 acpi_status status;
106
107 status = acpi_resource_to_address64(resource, &address);
108 if (ACPI_FAILURE(status))
109 return AE_OK;
110
111 if ((address.address.address_length > 0) &&
112 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
113 res->start = address.address.minimum;
114 res->end = address.address.minimum + address.address.address_length - 1;
115 }
116
117 return AE_OK;
118}
119
120static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
121 struct resource *res)
122{
123 acpi_status status;
124
125 res->start = -1;
126 status =
127 acpi_walk_resources(handle, METHOD_NAME__CRS,
128 get_root_bridge_busnr_callback, res);
129 if (ACPI_FAILURE(status))
130 return status;
131 if (res->start == -1)
132 return AE_ERROR;
133 return AE_OK;
134}
135
136struct pci_osc_bit_struct {
137 u32 bit;
138 char *desc;
139};
140
141static struct pci_osc_bit_struct pci_osc_support_bit[] = {
142 { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
143 { OSC_PCI_ASPM_SUPPORT, "ASPM" },
144 { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
145 { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
146 { OSC_PCI_MSI_SUPPORT, "MSI" },
147};
148
149static struct pci_osc_bit_struct pci_osc_control_bit[] = {
150 { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
151 { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
152 { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
153 { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
154 { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
155};
156
157static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
158 struct pci_osc_bit_struct *table, int size)
159{
160 char buf[80];
161 int i, len = 0;
162 struct pci_osc_bit_struct *entry;
163
164 buf[0] = '\0';
165 for (i = 0, entry = table; i < size; i++, entry++)
166 if (word & entry->bit)
167 len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
168 len ? " " : "", entry->desc);
169
170 dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
171}
172
173static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
174{
175 decode_osc_bits(root, msg, word, pci_osc_support_bit,
176 ARRAY_SIZE(pci_osc_support_bit));
177}
178
179static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
180{
181 decode_osc_bits(root, msg, word, pci_osc_control_bit,
182 ARRAY_SIZE(pci_osc_control_bit));
183}
184
185static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
186
187static acpi_status acpi_pci_run_osc(acpi_handle handle,
188 const u32 *capbuf, u32 *retval)
189{
190 struct acpi_osc_context context = {
191 .uuid_str = pci_osc_uuid_str,
192 .rev = 1,
193 .cap.length = 12,
194 .cap.pointer = (void *)capbuf,
195 };
196 acpi_status status;
197
198 status = acpi_run_osc(handle, &context);
199 if (ACPI_SUCCESS(status)) {
200 *retval = *((u32 *)(context.ret.pointer + 8));
201 kfree(context.ret.pointer);
202 }
203 return status;
204}
205
206static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
207 u32 support,
208 u32 *control)
209{
210 acpi_status status;
211 u32 result, capbuf[3];
212
213 support &= OSC_PCI_SUPPORT_MASKS;
214 support |= root->osc_support_set;
215
216 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
217 capbuf[OSC_SUPPORT_DWORD] = support;
218 if (control) {
219 *control &= OSC_PCI_CONTROL_MASKS;
220 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
221 } else {
222 /* 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
235static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
236{
237 acpi_status status;
238
239 mutex_lock(&osc_lock);
240 status = acpi_pci_query_osc(root, flags, NULL);
241 mutex_unlock(&osc_lock);
242 return status;
243}
244
245struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
246{
247 struct acpi_pci_root *root;
248 struct acpi_device *device;
249
250 if (acpi_bus_get_device(handle, &device) ||
251 acpi_match_device_ids(device, root_device_ids))
252 return NULL;
253
254 root = acpi_driver_data(device);
255
256 return root;
257}
258EXPORT_SYMBOL_GPL(acpi_pci_find_root);
259
260struct acpi_handle_node {
261 struct list_head node;
262 acpi_handle handle;
263};
264
265/**
266 * 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 */
277struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
278{
279 int dev, fn;
280 unsigned long long adr;
281 acpi_status status;
282 acpi_handle phandle;
283 struct pci_bus *pbus;
284 struct pci_dev *pdev = NULL;
285 struct acpi_handle_node *node, *tmp;
286 struct acpi_pci_root *root;
287 LIST_HEAD(device_list);
288
289 /*
290 * 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 }
344out:
345 list_for_each_entry_safe(node, tmp, &device_list, node)
346 kfree(node);
347
348 return pdev;
349}
350EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
351
352/**
353 * 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 **/
367acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
368{
369 struct acpi_pci_root *root;
370 acpi_status status = AE_OK;
371 u32 ctrl, capbuf[3];
372
373 if (!mask)
374 return AE_BAD_PARAMETER;
375
376 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
377 if ((ctrl & req) != req)
378 return AE_TYPE;
379
380 root = acpi_pci_find_root(handle);
381 if (!root)
382 return AE_NOT_EXIST;
383
384 mutex_lock(&osc_lock);
385
386 *mask = ctrl | root->osc_control_set;
387 /* 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;
416out:
417 mutex_unlock(&osc_lock);
418 return status;
419}
420EXPORT_SYMBOL(acpi_pci_osc_control_set);
421
422static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
423{
424 u32 support, control, requested;
425 acpi_status status;
426 struct acpi_device *device = root->device;
427 acpi_handle handle = device->handle;
428
429 /*
430 * 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
517static int acpi_pci_root_add(struct acpi_device *device,
518 const struct acpi_device_id *not_used)
519{
520 unsigned long long segment, bus;
521 acpi_status status;
522 int result;
523 struct acpi_pci_root *root;
524 acpi_handle handle = device->handle;
525 int no_aspm = 0;
526 bool hotadd = system_state != SYSTEM_BOOTING;
527
528 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
529 if (!root)
530 return -ENOMEM;
531
532 segment = 0;
533 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
534 &segment);
535 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
536 dev_err(&device->dev, "can't evaluate _SEG\n");
537 result = -ENODEV;
538 goto end;
539 }
540
541 /* 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
625remove_dmar:
626 if (hotadd)
627 dmar_device_remove(handle);
628end:
629 kfree(root);
630 return result;
631}
632
633static 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 */
660static 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
714next:
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
723int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
724{
725 int ret;
726 struct list_head *list = &info->resources;
727 struct acpi_device *device = info->bridge;
728 struct resource_entry *entry, *tmp;
729 unsigned long flags;
730
731 flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
732 ret = acpi_dev_get_resources(device, list,
733 acpi_dev_filter_resource_type_cb,
734 (void *)flags);
735 if (ret < 0)
736 dev_warn(&device->dev,
737 "failed to parse _CRS method, error code %d\n", ret);
738 else if (ret == 0)
739 dev_dbg(&device->dev,
740 "no IO and memory resources present in _CRS\n");
741 else {
742 resource_list_for_each_entry_safe(entry, tmp, list) {
743 if (entry->res->flags & IORESOURCE_DISABLED)
744 resource_list_destroy_entry(entry);
745 else
746 entry->res->name = info->name;
747 }
748 acpi_pci_root_validate_resources(&device->dev, list,
749 IORESOURCE_MEM);
750 acpi_pci_root_validate_resources(&device->dev, list,
751 IORESOURCE_IO);
752 }
753
754 return ret;
755}
756
757static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
758{
759 struct resource_entry *entry, *tmp;
760 struct resource *res, *conflict, *root = NULL;
761
762 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
763 res = entry->res;
764 if (res->flags & IORESOURCE_MEM)
765 root = &iomem_resource;
766 else if (res->flags & IORESOURCE_IO)
767 root = &ioport_resource;
768 else
769 continue;
770
771 /*
772 * Some legacy x86 host bridge drivers use iomem_resource and
773 * ioport_resource as default resource pool, skip it.
774 */
775 if (res == root)
776 continue;
777
778 conflict = insert_resource_conflict(root, res);
779 if (conflict) {
780 dev_info(&info->bridge->dev,
781 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
782 res, conflict->name, conflict);
783 resource_list_destroy_entry(entry);
784 }
785 }
786}
787
788static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
789{
790 struct resource *res;
791 struct resource_entry *entry, *tmp;
792
793 if (!info)
794 return;
795
796 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
797 res = entry->res;
798 if (res->parent &&
799 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
800 release_resource(res);
801 resource_list_destroy_entry(entry);
802 }
803
804 info->ops->release_info(info);
805}
806
807static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
808{
809 struct resource *res;
810 struct resource_entry *entry;
811
812 resource_list_for_each_entry(entry, &bridge->windows) {
813 res = entry->res;
814 if (res->parent &&
815 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
816 release_resource(res);
817 }
818 __acpi_pci_root_release_info(bridge->release_data);
819}
820
821struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
822 struct acpi_pci_root_ops *ops,
823 struct acpi_pci_root_info *info,
824 void *sysdata)
825{
826 int ret, busnum = root->secondary.start;
827 struct acpi_device *device = root->device;
828 int node = acpi_get_node(device->handle);
829 struct pci_bus *bus;
830
831 info->root = root;
832 info->bridge = device;
833 info->ops = ops;
834 INIT_LIST_HEAD(&info->resources);
835 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
836 root->segment, busnum);
837
838 if (ops->init_info && ops->init_info(info))
839 goto out_release_info;
840 if (ops->prepare_resources)
841 ret = ops->prepare_resources(info);
842 else
843 ret = acpi_pci_probe_root_resources(info);
844 if (ret < 0)
845 goto out_release_info;
846
847 pci_acpi_root_add_resources(info);
848 pci_add_resource(&info->resources, &root->secondary);
849 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
850 sysdata, &info->resources);
851 if (!bus)
852 goto out_release_info;
853
854 pci_scan_child_bus(bus);
855 pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
856 acpi_pci_root_release_info, info);
857 if (node != NUMA_NO_NODE)
858 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
859 return bus;
860
861out_release_info:
862 __acpi_pci_root_release_info(info);
863 return NULL;
864}
865
866void __init acpi_pci_root_init(void)
867{
868 acpi_hest_init();
869 if (acpi_pci_disabled)
870 return;
871
872 pci_acpi_crs_quirks();
873 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
874}
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
42ACPI_MODULE_NAME("pci_root");
43#define ACPI_PCI_ROOT_CLASS "pci_bridge"
44#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
45static int acpi_pci_root_add(struct acpi_device *device,
46 const struct acpi_device_id *not_used);
47static void acpi_pci_root_remove(struct acpi_device *device);
48
49static 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
60static const struct acpi_device_id root_device_ids[] = {
61 {"PNP0A03", 0},
62 {"", 0},
63};
64
65static 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
75static 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 */
84int 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}
99EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
100
101static acpi_status
102get_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
121static 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
137struct pci_osc_bit_struct {
138 u32 bit;
139 char *desc;
140};
141
142static 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
150static 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
158static 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
174static 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
180static 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
186static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
187
188static 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
207static 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
236static 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
246struct 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}
259EXPORT_SYMBOL_GPL(acpi_pci_find_root);
260
261struct 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 */
278struct 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 }
345out:
346 list_for_each_entry_safe(node, tmp, &device_list, node)
347 kfree(node);
348
349 return pdev;
350}
351EXPORT_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 **/
368acpi_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;
417out:
418 mutex_unlock(&osc_lock);
419 return status;
420}
421EXPORT_SYMBOL(acpi_pci_osc_control_set);
422
423static 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
517static int acpi_pci_root_add(struct acpi_device *device,
518 const struct acpi_device_id *not_used)
519{
520 unsigned long long segment, bus;
521 acpi_status status;
522 int result;
523 struct acpi_pci_root *root;
524 acpi_handle handle = device->handle;
525 int no_aspm = 0;
526 bool hotadd = system_state == SYSTEM_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
634remove_dmar:
635 if (hotadd)
636 dmar_device_remove(handle);
637end:
638 kfree(root);
639 return result;
640}
641
642static 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 */
669static 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
723next:
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
732static void acpi_pci_root_remap_iospace(struct fwnode_handle *fwnode,
733 struct resource_entry *entry)
734{
735#ifdef PCI_IOBASE
736 struct resource *res = entry->res;
737 resource_size_t cpu_addr = res->start;
738 resource_size_t pci_addr = cpu_addr - entry->offset;
739 resource_size_t length = resource_size(res);
740 unsigned long port;
741
742 if (pci_register_io_range(fwnode, cpu_addr, length))
743 goto err;
744
745 port = pci_address_to_pio(cpu_addr);
746 if (port == (unsigned long)-1)
747 goto err;
748
749 res->start = port;
750 res->end = port + length - 1;
751 entry->offset = port - pci_addr;
752
753 if (pci_remap_iospace(res, cpu_addr) < 0)
754 goto err;
755
756 pr_info("Remapped I/O %pa to %pR\n", &cpu_addr, res);
757 return;
758err:
759 res->flags |= IORESOURCE_DISABLED;
760#endif
761}
762
763int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
764{
765 int ret;
766 struct list_head *list = &info->resources;
767 struct acpi_device *device = info->bridge;
768 struct resource_entry *entry, *tmp;
769 unsigned long flags;
770
771 flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
772 ret = acpi_dev_get_resources(device, list,
773 acpi_dev_filter_resource_type_cb,
774 (void *)flags);
775 if (ret < 0)
776 dev_warn(&device->dev,
777 "failed to parse _CRS method, error code %d\n", ret);
778 else if (ret == 0)
779 dev_dbg(&device->dev,
780 "no IO and memory resources present in _CRS\n");
781 else {
782 resource_list_for_each_entry_safe(entry, tmp, list) {
783 if (entry->res->flags & IORESOURCE_IO)
784 acpi_pci_root_remap_iospace(&device->fwnode,
785 entry);
786
787 if (entry->res->flags & IORESOURCE_DISABLED)
788 resource_list_destroy_entry(entry);
789 else
790 entry->res->name = info->name;
791 }
792 acpi_pci_root_validate_resources(&device->dev, list,
793 IORESOURCE_MEM);
794 acpi_pci_root_validate_resources(&device->dev, list,
795 IORESOURCE_IO);
796 }
797
798 return ret;
799}
800
801static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
802{
803 struct resource_entry *entry, *tmp;
804 struct resource *res, *conflict, *root = NULL;
805
806 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
807 res = entry->res;
808 if (res->flags & IORESOURCE_MEM)
809 root = &iomem_resource;
810 else if (res->flags & IORESOURCE_IO)
811 root = &ioport_resource;
812 else
813 continue;
814
815 /*
816 * Some legacy x86 host bridge drivers use iomem_resource and
817 * ioport_resource as default resource pool, skip it.
818 */
819 if (res == root)
820 continue;
821
822 conflict = insert_resource_conflict(root, res);
823 if (conflict) {
824 dev_info(&info->bridge->dev,
825 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
826 res, conflict->name, conflict);
827 resource_list_destroy_entry(entry);
828 }
829 }
830}
831
832static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
833{
834 struct resource *res;
835 struct resource_entry *entry, *tmp;
836
837 if (!info)
838 return;
839
840 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
841 res = entry->res;
842 if (res->parent &&
843 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
844 release_resource(res);
845 resource_list_destroy_entry(entry);
846 }
847
848 info->ops->release_info(info);
849}
850
851static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
852{
853 struct resource *res;
854 struct resource_entry *entry;
855
856 resource_list_for_each_entry(entry, &bridge->windows) {
857 res = entry->res;
858 if (res->flags & IORESOURCE_IO)
859 pci_unmap_iospace(res);
860 if (res->parent &&
861 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
862 release_resource(res);
863 }
864 __acpi_pci_root_release_info(bridge->release_data);
865}
866
867struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
868 struct acpi_pci_root_ops *ops,
869 struct acpi_pci_root_info *info,
870 void *sysdata)
871{
872 int ret, busnum = root->secondary.start;
873 struct acpi_device *device = root->device;
874 int node = acpi_get_node(device->handle);
875 struct pci_bus *bus;
876 struct pci_host_bridge *host_bridge;
877
878 info->root = root;
879 info->bridge = device;
880 info->ops = ops;
881 INIT_LIST_HEAD(&info->resources);
882 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
883 root->segment, busnum);
884
885 if (ops->init_info && ops->init_info(info))
886 goto out_release_info;
887 if (ops->prepare_resources)
888 ret = ops->prepare_resources(info);
889 else
890 ret = acpi_pci_probe_root_resources(info);
891 if (ret < 0)
892 goto out_release_info;
893
894 pci_acpi_root_add_resources(info);
895 pci_add_resource(&info->resources, &root->secondary);
896 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
897 sysdata, &info->resources);
898 if (!bus)
899 goto out_release_info;
900
901 host_bridge = to_pci_host_bridge(bus->bridge);
902 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
903 host_bridge->native_hotplug = 0;
904 if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
905 host_bridge->native_aer = 0;
906 if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))
907 host_bridge->native_pme = 0;
908
909 pci_scan_child_bus(bus);
910 pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info,
911 info);
912 if (node != NUMA_NO_NODE)
913 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
914 return bus;
915
916out_release_info:
917 __acpi_pci_root_release_info(info);
918 return NULL;
919}
920
921void __init acpi_pci_root_init(void)
922{
923 acpi_hest_init();
924 if (acpi_pci_disabled)
925 return;
926
927 pci_acpi_crs_quirks();
928 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
929}