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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 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/spinlock.h>
31#include <linux/pm.h>
32#include <linux/pm_runtime.h>
33#include <linux/pci.h>
34#include <linux/pci-acpi.h>
35#include <linux/pci-aspm.h>
36#include <linux/acpi.h>
37#include <linux/slab.h>
38#include <acpi/acpi_bus.h>
39#include <acpi/acpi_drivers.h>
40#include <acpi/apei.h>
41
42#define PREFIX "ACPI: "
43
44#define _COMPONENT ACPI_PCI_COMPONENT
45ACPI_MODULE_NAME("pci_root");
46#define ACPI_PCI_ROOT_CLASS "pci_bridge"
47#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
48static int acpi_pci_root_add(struct acpi_device *device);
49static int acpi_pci_root_remove(struct acpi_device *device, int type);
50static int acpi_pci_root_start(struct acpi_device *device);
51
52#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
53 | OSC_ACTIVE_STATE_PWR_SUPPORT \
54 | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
55 | OSC_MSI_SUPPORT)
56
57static const struct acpi_device_id root_device_ids[] = {
58 {"PNP0A03", 0},
59 {"", 0},
60};
61MODULE_DEVICE_TABLE(acpi, root_device_ids);
62
63static struct acpi_driver acpi_pci_root_driver = {
64 .name = "pci_root",
65 .class = ACPI_PCI_ROOT_CLASS,
66 .ids = root_device_ids,
67 .ops = {
68 .add = acpi_pci_root_add,
69 .remove = acpi_pci_root_remove,
70 .start = acpi_pci_root_start,
71 },
72};
73
74static LIST_HEAD(acpi_pci_roots);
75
76static struct acpi_pci_driver *sub_driver;
77static DEFINE_MUTEX(osc_lock);
78
79int acpi_pci_register_driver(struct acpi_pci_driver *driver)
80{
81 int n = 0;
82 struct acpi_pci_root *root;
83
84 struct acpi_pci_driver **pptr = &sub_driver;
85 while (*pptr)
86 pptr = &(*pptr)->next;
87 *pptr = driver;
88
89 if (!driver->add)
90 return 0;
91
92 list_for_each_entry(root, &acpi_pci_roots, node) {
93 driver->add(root->device->handle);
94 n++;
95 }
96
97 return n;
98}
99
100EXPORT_SYMBOL(acpi_pci_register_driver);
101
102void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
103{
104 struct acpi_pci_root *root;
105
106 struct acpi_pci_driver **pptr = &sub_driver;
107 while (*pptr) {
108 if (*pptr == driver)
109 break;
110 pptr = &(*pptr)->next;
111 }
112 BUG_ON(!*pptr);
113 *pptr = (*pptr)->next;
114
115 if (!driver->remove)
116 return;
117
118 list_for_each_entry(root, &acpi_pci_roots, node)
119 driver->remove(root->device->handle);
120}
121
122EXPORT_SYMBOL(acpi_pci_unregister_driver);
123
124acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
125{
126 struct acpi_pci_root *root;
127
128 list_for_each_entry(root, &acpi_pci_roots, node)
129 if ((root->segment == (u16) seg) &&
130 (root->secondary.start == (u16) bus))
131 return root->device->handle;
132 return NULL;
133}
134
135EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
136
137/**
138 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
139 * @handle - the ACPI CA node in question.
140 *
141 * Note: we could make this API take a struct acpi_device * instead, but
142 * for now, it's more convenient to operate on an acpi_handle.
143 */
144int acpi_is_root_bridge(acpi_handle handle)
145{
146 int ret;
147 struct acpi_device *device;
148
149 ret = acpi_bus_get_device(handle, &device);
150 if (ret)
151 return 0;
152
153 ret = acpi_match_device_ids(device, root_device_ids);
154 if (ret)
155 return 0;
156 else
157 return 1;
158}
159EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
160
161static acpi_status
162get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
163{
164 struct resource *res = data;
165 struct acpi_resource_address64 address;
166
167 if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
168 resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
169 resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
170 return AE_OK;
171
172 acpi_resource_to_address64(resource, &address);
173 if ((address.address_length > 0) &&
174 (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
175 res->start = address.minimum;
176 res->end = address.minimum + address.address_length - 1;
177 }
178
179 return AE_OK;
180}
181
182static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
183 struct resource *res)
184{
185 acpi_status status;
186
187 res->start = -1;
188 status =
189 acpi_walk_resources(handle, METHOD_NAME__CRS,
190 get_root_bridge_busnr_callback, res);
191 if (ACPI_FAILURE(status))
192 return status;
193 if (res->start == -1)
194 return AE_ERROR;
195 return AE_OK;
196}
197
198static void acpi_pci_bridge_scan(struct acpi_device *device)
199{
200 int status;
201 struct acpi_device *child = NULL;
202
203 if (device->flags.bus_address)
204 if (device->parent && device->parent->ops.bind) {
205 status = device->parent->ops.bind(device);
206 if (!status) {
207 list_for_each_entry(child, &device->children, node)
208 acpi_pci_bridge_scan(child);
209 }
210 }
211}
212
213static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
214
215static acpi_status acpi_pci_run_osc(acpi_handle handle,
216 const u32 *capbuf, u32 *retval)
217{
218 struct acpi_osc_context context = {
219 .uuid_str = pci_osc_uuid_str,
220 .rev = 1,
221 .cap.length = 12,
222 .cap.pointer = (void *)capbuf,
223 };
224 acpi_status status;
225
226 status = acpi_run_osc(handle, &context);
227 if (ACPI_SUCCESS(status)) {
228 *retval = *((u32 *)(context.ret.pointer + 8));
229 kfree(context.ret.pointer);
230 }
231 return status;
232}
233
234static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
235 u32 support,
236 u32 *control)
237{
238 acpi_status status;
239 u32 result, capbuf[3];
240
241 support &= OSC_PCI_SUPPORT_MASKS;
242 support |= root->osc_support_set;
243
244 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
245 capbuf[OSC_SUPPORT_TYPE] = support;
246 if (control) {
247 *control &= OSC_PCI_CONTROL_MASKS;
248 capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
249 } else {
250 /* Run _OSC query for all possible controls. */
251 capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
252 }
253
254 status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
255 if (ACPI_SUCCESS(status)) {
256 root->osc_support_set = support;
257 if (control)
258 *control = result;
259 }
260 return status;
261}
262
263static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
264{
265 acpi_status status;
266 acpi_handle tmp;
267
268 status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
269 if (ACPI_FAILURE(status))
270 return status;
271 mutex_lock(&osc_lock);
272 status = acpi_pci_query_osc(root, flags, NULL);
273 mutex_unlock(&osc_lock);
274 return status;
275}
276
277struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
278{
279 struct acpi_pci_root *root;
280
281 list_for_each_entry(root, &acpi_pci_roots, node) {
282 if (root->device->handle == handle)
283 return root;
284 }
285 return NULL;
286}
287EXPORT_SYMBOL_GPL(acpi_pci_find_root);
288
289struct acpi_handle_node {
290 struct list_head node;
291 acpi_handle handle;
292};
293
294/**
295 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
296 * @handle: the handle in question
297 *
298 * Given an ACPI CA handle, the desired PCI device is located in the
299 * list of PCI devices.
300 *
301 * If the device is found, its reference count is increased and this
302 * function returns a pointer to its data structure. The caller must
303 * decrement the reference count by calling pci_dev_put().
304 * If no device is found, %NULL is returned.
305 */
306struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
307{
308 int dev, fn;
309 unsigned long long adr;
310 acpi_status status;
311 acpi_handle phandle;
312 struct pci_bus *pbus;
313 struct pci_dev *pdev = NULL;
314 struct acpi_handle_node *node, *tmp;
315 struct acpi_pci_root *root;
316 LIST_HEAD(device_list);
317
318 /*
319 * Walk up the ACPI CA namespace until we reach a PCI root bridge.
320 */
321 phandle = handle;
322 while (!acpi_is_root_bridge(phandle)) {
323 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
324 if (!node)
325 goto out;
326
327 INIT_LIST_HEAD(&node->node);
328 node->handle = phandle;
329 list_add(&node->node, &device_list);
330
331 status = acpi_get_parent(phandle, &phandle);
332 if (ACPI_FAILURE(status))
333 goto out;
334 }
335
336 root = acpi_pci_find_root(phandle);
337 if (!root)
338 goto out;
339
340 pbus = root->bus;
341
342 /*
343 * Now, walk back down the PCI device tree until we return to our
344 * original handle. Assumes that everything between the PCI root
345 * bridge and the device we're looking for must be a P2P bridge.
346 */
347 list_for_each_entry(node, &device_list, node) {
348 acpi_handle hnd = node->handle;
349 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
350 if (ACPI_FAILURE(status))
351 goto out;
352 dev = (adr >> 16) & 0xffff;
353 fn = adr & 0xffff;
354
355 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
356 if (!pdev || hnd == handle)
357 break;
358
359 pbus = pdev->subordinate;
360 pci_dev_put(pdev);
361
362 /*
363 * This function may be called for a non-PCI device that has a
364 * PCI parent (eg. a disk under a PCI SATA controller). In that
365 * case pdev->subordinate will be NULL for the parent.
366 */
367 if (!pbus) {
368 dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
369 pdev = NULL;
370 break;
371 }
372 }
373out:
374 list_for_each_entry_safe(node, tmp, &device_list, node)
375 kfree(node);
376
377 return pdev;
378}
379EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
380
381/**
382 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
383 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
384 * @mask: Mask of _OSC bits to request control of, place to store control mask.
385 * @req: Mask of _OSC bits the control of is essential to the caller.
386 *
387 * Run _OSC query for @mask and if that is successful, compare the returned
388 * mask of control bits with @req. If all of the @req bits are set in the
389 * returned mask, run _OSC request for it.
390 *
391 * The variable at the @mask address may be modified regardless of whether or
392 * not the function returns success. On success it will contain the mask of
393 * _OSC bits the BIOS has granted control of, but its contents are meaningless
394 * on failure.
395 **/
396acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
397{
398 struct acpi_pci_root *root;
399 acpi_status status;
400 u32 ctrl, capbuf[3];
401 acpi_handle tmp;
402
403 if (!mask)
404 return AE_BAD_PARAMETER;
405
406 ctrl = *mask & OSC_PCI_CONTROL_MASKS;
407 if ((ctrl & req) != req)
408 return AE_TYPE;
409
410 root = acpi_pci_find_root(handle);
411 if (!root)
412 return AE_NOT_EXIST;
413
414 status = acpi_get_handle(handle, "_OSC", &tmp);
415 if (ACPI_FAILURE(status))
416 return status;
417
418 mutex_lock(&osc_lock);
419
420 *mask = ctrl | root->osc_control_set;
421 /* No need to evaluate _OSC if the control was already granted. */
422 if ((root->osc_control_set & ctrl) == ctrl)
423 goto out;
424
425 /* Need to check the available controls bits before requesting them. */
426 while (*mask) {
427 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
428 if (ACPI_FAILURE(status))
429 goto out;
430 if (ctrl == *mask)
431 break;
432 ctrl = *mask;
433 }
434
435 if ((ctrl & req) != req) {
436 status = AE_SUPPORT;
437 goto out;
438 }
439
440 capbuf[OSC_QUERY_TYPE] = 0;
441 capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
442 capbuf[OSC_CONTROL_TYPE] = ctrl;
443 status = acpi_pci_run_osc(handle, capbuf, mask);
444 if (ACPI_SUCCESS(status))
445 root->osc_control_set = *mask;
446out:
447 mutex_unlock(&osc_lock);
448 return status;
449}
450EXPORT_SYMBOL(acpi_pci_osc_control_set);
451
452static int __devinit acpi_pci_root_add(struct acpi_device *device)
453{
454 unsigned long long segment, bus;
455 acpi_status status;
456 int result;
457 struct acpi_pci_root *root;
458 acpi_handle handle;
459 struct acpi_device *child;
460 u32 flags, base_flags;
461
462 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
463 if (!root)
464 return -ENOMEM;
465
466 segment = 0;
467 status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
468 &segment);
469 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
470 printk(KERN_ERR PREFIX "can't evaluate _SEG\n");
471 result = -ENODEV;
472 goto end;
473 }
474
475 /* Check _CRS first, then _BBN. If no _BBN, default to zero. */
476 root->secondary.flags = IORESOURCE_BUS;
477 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
478 if (ACPI_FAILURE(status)) {
479 /*
480 * We need both the start and end of the downstream bus range
481 * to interpret _CBA (MMCONFIG base address), so it really is
482 * supposed to be in _CRS. If we don't find it there, all we
483 * can do is assume [_BBN-0xFF] or [0-0xFF].
484 */
485 root->secondary.end = 0xFF;
486 printk(KERN_WARNING FW_BUG PREFIX
487 "no secondary bus range in _CRS\n");
488 status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN,
489 NULL, &bus);
490 if (ACPI_SUCCESS(status))
491 root->secondary.start = bus;
492 else if (status == AE_NOT_FOUND)
493 root->secondary.start = 0;
494 else {
495 printk(KERN_ERR PREFIX "can't evaluate _BBN\n");
496 result = -ENODEV;
497 goto end;
498 }
499 }
500
501 INIT_LIST_HEAD(&root->node);
502 root->device = device;
503 root->segment = segment & 0xFFFF;
504 strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
505 strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
506 device->driver_data = root;
507
508 /*
509 * All supported architectures that use ACPI have support for
510 * PCI domains, so we indicate this in _OSC support capabilities.
511 */
512 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
513 acpi_pci_osc_support(root, flags);
514
515 /*
516 * TBD: Need PCI interface for enumeration/configuration of roots.
517 */
518
519 /* TBD: Locking */
520 list_add_tail(&root->node, &acpi_pci_roots);
521
522 printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n",
523 acpi_device_name(device), acpi_device_bid(device),
524 root->segment, &root->secondary);
525
526 /*
527 * Scan the Root Bridge
528 * --------------------
529 * Must do this prior to any attempt to bind the root device, as the
530 * PCI namespace does not get created until this call is made (and
531 * thus the root bridge's pci_dev does not exist).
532 */
533 root->bus = pci_acpi_scan_root(root);
534 if (!root->bus) {
535 printk(KERN_ERR PREFIX
536 "Bus %04x:%02x not present in PCI namespace\n",
537 root->segment, (unsigned int)root->secondary.start);
538 result = -ENODEV;
539 goto end;
540 }
541
542 /*
543 * Attach ACPI-PCI Context
544 * -----------------------
545 * Thus binding the ACPI and PCI devices.
546 */
547 result = acpi_pci_bind_root(device);
548 if (result)
549 goto end;
550
551 /*
552 * PCI Routing Table
553 * -----------------
554 * Evaluate and parse _PRT, if exists.
555 */
556 status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
557 if (ACPI_SUCCESS(status))
558 result = acpi_pci_irq_add_prt(device->handle, root->bus);
559
560 /*
561 * Scan and bind all _ADR-Based Devices
562 */
563 list_for_each_entry(child, &device->children, node)
564 acpi_pci_bridge_scan(child);
565
566 /* Indicate support for various _OSC capabilities. */
567 if (pci_ext_cfg_avail(root->bus->self))
568 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
569 if (pcie_aspm_support_enabled())
570 flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
571 OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
572 if (pci_msi_enabled())
573 flags |= OSC_MSI_SUPPORT;
574 if (flags != base_flags)
575 acpi_pci_osc_support(root, flags);
576
577 if (!pcie_ports_disabled
578 && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
579 flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
580 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
581 | OSC_PCI_EXPRESS_PME_CONTROL;
582
583 if (pci_aer_available()) {
584 if (aer_acpi_firmware_first())
585 dev_dbg(root->bus->bridge,
586 "PCIe errors handled by BIOS.\n");
587 else
588 flags |= OSC_PCI_EXPRESS_AER_CONTROL;
589 }
590
591 dev_info(root->bus->bridge,
592 "Requesting ACPI _OSC control (0x%02x)\n", flags);
593
594 status = acpi_pci_osc_control_set(device->handle, &flags,
595 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
596 if (ACPI_SUCCESS(status)) {
597 dev_info(root->bus->bridge,
598 "ACPI _OSC control (0x%02x) granted\n", flags);
599 } else {
600 dev_info(root->bus->bridge,
601 "ACPI _OSC request failed (%s), "
602 "returned control mask: 0x%02x\n",
603 acpi_format_exception(status), flags);
604 pr_info("ACPI _OSC control for PCIe not granted, "
605 "disabling ASPM\n");
606 pcie_no_aspm();
607 }
608 } else {
609 dev_info(root->bus->bridge,
610 "Unable to request _OSC control "
611 "(_OSC support mask: 0x%02x)\n", flags);
612 }
613
614 pci_acpi_add_bus_pm_notifier(device, root->bus);
615 if (device->wakeup.flags.run_wake)
616 device_set_run_wake(root->bus->bridge, true);
617
618 return 0;
619
620end:
621 if (!list_empty(&root->node))
622 list_del(&root->node);
623 kfree(root);
624 return result;
625}
626
627static int acpi_pci_root_start(struct acpi_device *device)
628{
629 struct acpi_pci_root *root = acpi_driver_data(device);
630
631 pci_bus_add_devices(root->bus);
632 return 0;
633}
634
635static int acpi_pci_root_remove(struct acpi_device *device, int type)
636{
637 struct acpi_pci_root *root = acpi_driver_data(device);
638
639 device_set_run_wake(root->bus->bridge, false);
640 pci_acpi_remove_bus_pm_notifier(device);
641
642 kfree(root);
643 return 0;
644}
645
646static int __init acpi_pci_root_init(void)
647{
648 acpi_hest_init();
649
650 if (acpi_pci_disabled)
651 return 0;
652
653 pci_acpi_crs_quirks();
654 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
655 return -ENODEV;
656
657 return 0;
658}
659
660subsys_initcall(acpi_pci_root_init);
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}