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
acpi_pci_root_scan_dependent(struct acpi_device * adev)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 */
acpi_is_root_bridge(acpi_handle handle)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
get_root_bridge_busnr_callback(struct acpi_resource * resource,void * data)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
try_get_root_bridge_busnr(acpi_handle handle,struct resource * res)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
decode_osc_bits(struct acpi_pci_root * root,char * msg,u32 word,struct pci_osc_bit_struct * table,int size)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
decode_osc_support(struct acpi_pci_root * root,char * msg,u32 word)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
decode_osc_control(struct acpi_pci_root * root,char * msg,u32 word)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
acpi_pci_run_osc(acpi_handle handle,const u32 * capbuf,u32 * retval)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
acpi_pci_query_osc(struct acpi_pci_root * root,u32 support,u32 * control)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
acpi_pci_osc_support(struct acpi_pci_root * root,u32 flags)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
acpi_pci_find_root(acpi_handle handle)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 */
acpi_get_pci_dev(acpi_handle handle)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 **/
acpi_pci_osc_control_set(acpi_handle handle,u32 * mask,u32 req)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
negotiate_os_control(struct acpi_pci_root * root,int * no_aspm)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)%s\n",
458 acpi_format_exception(status),
459 pcie_aspm_support_enabled() ? "; disabling ASPM" : "");
460 *no_aspm = 1;
461 return;
462 }
463
464 if (pcie_ports_disabled) {
465 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
466 return;
467 }
468
469 if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
470 decode_osc_support(root, "not requesting OS control; OS requires",
471 ACPI_PCIE_REQ_SUPPORT);
472 return;
473 }
474
475 control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
476 | OSC_PCI_EXPRESS_PME_CONTROL;
477
478 if (IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
479 control |= OSC_PCI_EXPRESS_NATIVE_HP_CONTROL;
480
481 if (pci_aer_available()) {
482 if (aer_acpi_firmware_first())
483 dev_info(&device->dev,
484 "PCIe AER handled by firmware\n");
485 else
486 control |= OSC_PCI_EXPRESS_AER_CONTROL;
487 }
488
489 requested = control;
490 status = acpi_pci_osc_control_set(handle, &control,
491 OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
492 if (ACPI_SUCCESS(status)) {
493 decode_osc_control(root, "OS now controls", control);
494 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
495 /*
496 * We have ASPM control, but the FADT indicates that
497 * it's unsupported. Leave existing configuration
498 * intact and prevent the OS from touching it.
499 */
500 dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
501 *no_aspm = 1;
502 }
503 } else {
504 decode_osc_control(root, "OS requested", requested);
505 decode_osc_control(root, "platform willing to grant", control);
506 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
507 acpi_format_exception(status));
508
509 /*
510 * We want to disable ASPM here, but aspm_disabled
511 * needs to remain in its state from boot so that we
512 * properly handle PCIe 1.1 devices. So we set this
513 * flag here, to defer the action until after the ACPI
514 * root scan.
515 */
516 *no_aspm = 1;
517 }
518 }
519
acpi_pci_root_add(struct acpi_device * device,const struct acpi_device_id * not_used)520 static int acpi_pci_root_add(struct acpi_device *device,
521 const struct acpi_device_id *not_used)
522 {
523 unsigned long long segment, bus;
524 acpi_status status;
525 int result;
526 struct acpi_pci_root *root;
527 acpi_handle handle = device->handle;
528 int no_aspm = 0;
529 bool hotadd = system_state != SYSTEM_BOOTING;
530
531 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
532 if (!root)
533 return -ENOMEM;
534
535 segment = 0;
536 status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
537 &segment);
538 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
539 dev_err(&device->dev, "can't evaluate _SEG\n");
540 result = -ENODEV;
541 goto end;
542 }
543
544 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
545 root->secondary.flags = IORESOURCE_BUS;
546 status = try_get_root_bridge_busnr(handle, &root->secondary);
547 if (ACPI_FAILURE(status)) {
548 /*
549 * We need both the start and end of the downstream bus range
550 * to interpret _CBA (MMCONFIG base address), so it really is
551 * supposed to be in _CRS. If we don't find it there, all we
552 * can do is assume [_BBN-0xFF] or [0-0xFF].
553 */
554 root->secondary.end = 0xFF;
555 dev_warn(&device->dev,
556 FW_BUG "no secondary bus range in _CRS\n");
557 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
558 NULL, &bus);
559 if (ACPI_SUCCESS(status))
560 root->secondary.start = bus;
561 else if (status == AE_NOT_FOUND)
562 root->secondary.start = 0;
563 else {
564 dev_err(&device->dev, "can't evaluate _BBN\n");
565 result = -ENODEV;
566 goto end;
567 }
568 }
569
570 root->device = device;
571 root->segment = segment & 0xFFFF;
572 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
573 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
574 device->driver_data = root;
575
576 if (hotadd && dmar_device_add(handle)) {
577 result = -ENXIO;
578 goto end;
579 }
580
581 pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
582 acpi_device_name(device), acpi_device_bid(device),
583 root->segment, &root->secondary);
584
585 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
586
587 negotiate_os_control(root, &no_aspm);
588
589 /*
590 * TBD: Need PCI interface for enumeration/configuration of roots.
591 */
592
593 /*
594 * Scan the Root Bridge
595 * --------------------
596 * Must do this prior to any attempt to bind the root device, as the
597 * PCI namespace does not get created until this call is made (and
598 * thus the root bridge's pci_dev does not exist).
599 */
600 root->bus = pci_acpi_scan_root(root);
601 if (!root->bus) {
602 dev_err(&device->dev,
603 "Bus %04x:%02x not present in PCI namespace\n",
604 root->segment, (unsigned int)root->secondary.start);
605 device->driver_data = NULL;
606 result = -ENODEV;
607 goto remove_dmar;
608 }
609
610 if (no_aspm)
611 pcie_no_aspm();
612
613 pci_acpi_add_bus_pm_notifier(device);
614 if (device->wakeup.flags.run_wake)
615 device_set_run_wake(root->bus->bridge, true);
616
617 if (hotadd) {
618 pcibios_resource_survey_bus(root->bus);
619 pci_assign_unassigned_root_bus_resources(root->bus);
620 acpi_ioapic_add(root);
621 }
622
623 pci_lock_rescan_remove();
624 pci_bus_add_devices(root->bus);
625 pci_unlock_rescan_remove();
626 return 1;
627
628 remove_dmar:
629 if (hotadd)
630 dmar_device_remove(handle);
631 end:
632 kfree(root);
633 return result;
634 }
635
acpi_pci_root_remove(struct acpi_device * device)636 static void acpi_pci_root_remove(struct acpi_device *device)
637 {
638 struct acpi_pci_root *root = acpi_driver_data(device);
639
640 pci_lock_rescan_remove();
641
642 pci_stop_root_bus(root->bus);
643
644 WARN_ON(acpi_ioapic_remove(root));
645
646 device_set_run_wake(root->bus->bridge, false);
647 pci_acpi_remove_bus_pm_notifier(device);
648
649 pci_remove_root_bus(root->bus);
650
651 dmar_device_remove(device->handle);
652
653 pci_unlock_rescan_remove();
654
655 kfree(root);
656 }
657
658 /*
659 * Following code to support acpi_pci_root_create() is copied from
660 * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64
661 * and ARM64.
662 */
acpi_pci_root_validate_resources(struct device * dev,struct list_head * resources,unsigned long type)663 static void acpi_pci_root_validate_resources(struct device *dev,
664 struct list_head *resources,
665 unsigned long type)
666 {
667 LIST_HEAD(list);
668 struct resource *res1, *res2, *root = NULL;
669 struct resource_entry *tmp, *entry, *entry2;
670
671 BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
672 root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
673
674 list_splice_init(resources, &list);
675 resource_list_for_each_entry_safe(entry, tmp, &list) {
676 bool free = false;
677 resource_size_t end;
678
679 res1 = entry->res;
680 if (!(res1->flags & type))
681 goto next;
682
683 /* Exclude non-addressable range or non-addressable portion */
684 end = min(res1->end, root->end);
685 if (end <= res1->start) {
686 dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
687 res1);
688 free = true;
689 goto next;
690 } else if (res1->end != end) {
691 dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
692 res1, (unsigned long long)end + 1,
693 (unsigned long long)res1->end);
694 res1->end = end;
695 }
696
697 resource_list_for_each_entry(entry2, resources) {
698 res2 = entry2->res;
699 if (!(res2->flags & type))
700 continue;
701
702 /*
703 * I don't like throwing away windows because then
704 * our resources no longer match the ACPI _CRS, but
705 * the kernel resource tree doesn't allow overlaps.
706 */
707 if (resource_overlaps(res1, res2)) {
708 res2->start = min(res1->start, res2->start);
709 res2->end = max(res1->end, res2->end);
710 dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
711 res2, res1);
712 free = true;
713 goto next;
714 }
715 }
716
717 next:
718 resource_list_del(entry);
719 if (free)
720 resource_list_free_entry(entry);
721 else
722 resource_list_add_tail(entry, resources);
723 }
724 }
725
acpi_pci_probe_root_resources(struct acpi_pci_root_info * info)726 int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
727 {
728 int ret;
729 struct list_head *list = &info->resources;
730 struct acpi_device *device = info->bridge;
731 struct resource_entry *entry, *tmp;
732 unsigned long flags;
733
734 flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT;
735 ret = acpi_dev_get_resources(device, list,
736 acpi_dev_filter_resource_type_cb,
737 (void *)flags);
738 if (ret < 0)
739 dev_warn(&device->dev,
740 "failed to parse _CRS method, error code %d\n", ret);
741 else if (ret == 0)
742 dev_dbg(&device->dev,
743 "no IO and memory resources present in _CRS\n");
744 else {
745 resource_list_for_each_entry_safe(entry, tmp, list) {
746 if (entry->res->flags & IORESOURCE_DISABLED)
747 resource_list_destroy_entry(entry);
748 else
749 entry->res->name = info->name;
750 }
751 acpi_pci_root_validate_resources(&device->dev, list,
752 IORESOURCE_MEM);
753 acpi_pci_root_validate_resources(&device->dev, list,
754 IORESOURCE_IO);
755 }
756
757 return ret;
758 }
759
pci_acpi_root_add_resources(struct acpi_pci_root_info * info)760 static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info)
761 {
762 struct resource_entry *entry, *tmp;
763 struct resource *res, *conflict, *root = NULL;
764
765 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
766 res = entry->res;
767 if (res->flags & IORESOURCE_MEM)
768 root = &iomem_resource;
769 else if (res->flags & IORESOURCE_IO)
770 root = &ioport_resource;
771 else
772 continue;
773
774 /*
775 * Some legacy x86 host bridge drivers use iomem_resource and
776 * ioport_resource as default resource pool, skip it.
777 */
778 if (res == root)
779 continue;
780
781 conflict = insert_resource_conflict(root, res);
782 if (conflict) {
783 dev_info(&info->bridge->dev,
784 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
785 res, conflict->name, conflict);
786 resource_list_destroy_entry(entry);
787 }
788 }
789 }
790
__acpi_pci_root_release_info(struct acpi_pci_root_info * info)791 static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info)
792 {
793 struct resource *res;
794 struct resource_entry *entry, *tmp;
795
796 if (!info)
797 return;
798
799 resource_list_for_each_entry_safe(entry, tmp, &info->resources) {
800 res = entry->res;
801 if (res->parent &&
802 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
803 release_resource(res);
804 resource_list_destroy_entry(entry);
805 }
806
807 info->ops->release_info(info);
808 }
809
acpi_pci_root_release_info(struct pci_host_bridge * bridge)810 static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
811 {
812 struct resource *res;
813 struct resource_entry *entry;
814
815 resource_list_for_each_entry(entry, &bridge->windows) {
816 res = entry->res;
817 if (res->parent &&
818 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
819 release_resource(res);
820 }
821 __acpi_pci_root_release_info(bridge->release_data);
822 }
823
acpi_pci_root_create(struct acpi_pci_root * root,struct acpi_pci_root_ops * ops,struct acpi_pci_root_info * info,void * sysdata)824 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
825 struct acpi_pci_root_ops *ops,
826 struct acpi_pci_root_info *info,
827 void *sysdata)
828 {
829 int ret, busnum = root->secondary.start;
830 struct acpi_device *device = root->device;
831 int node = acpi_get_node(device->handle);
832 struct pci_bus *bus;
833
834 info->root = root;
835 info->bridge = device;
836 info->ops = ops;
837 INIT_LIST_HEAD(&info->resources);
838 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x",
839 root->segment, busnum);
840
841 if (ops->init_info && ops->init_info(info))
842 goto out_release_info;
843 if (ops->prepare_resources)
844 ret = ops->prepare_resources(info);
845 else
846 ret = acpi_pci_probe_root_resources(info);
847 if (ret < 0)
848 goto out_release_info;
849
850 pci_acpi_root_add_resources(info);
851 pci_add_resource(&info->resources, &root->secondary);
852 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
853 sysdata, &info->resources);
854 if (!bus)
855 goto out_release_info;
856
857 pci_scan_child_bus(bus);
858 pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
859 acpi_pci_root_release_info, info);
860 if (node != NUMA_NO_NODE)
861 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
862 return bus;
863
864 out_release_info:
865 __acpi_pci_root_release_info(info);
866 return NULL;
867 }
868
acpi_pci_root_init(void)869 void __init acpi_pci_root_init(void)
870 {
871 acpi_hest_init();
872 if (acpi_pci_disabled)
873 return;
874
875 pci_acpi_crs_quirks();
876 acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
877 }
878