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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
139
140
141
142
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
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
296
297
298
299
300
301
302
303
304
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
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
344
345
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
364
365
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
383
384
385
386
387
388
389
390
391
392
393
394
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
422 if ((root->osc_control_set & ctrl) == ctrl)
423 goto out;
424
425
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
476 root->secondary.flags = IORESOURCE_BUS;
477 status = try_get_root_bridge_busnr(device->handle, &root->secondary);
478 if (ACPI_FAILURE(status)) {
479
480
481
482
483
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
510
511
512 flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
513 acpi_pci_osc_support(root, flags);
514
515
516
517
518
519
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
528
529
530
531
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
544
545
546
547 result = acpi_pci_bind_root(device);
548 if (result)
549 goto end;
550
551
552
553
554
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
562
563 list_for_each_entry(child, &device->children, node)
564 acpi_pci_bridge_scan(child);
565
566
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 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
600
601
602
603
604 pcie_clear_aspm(root->bus);
605 }
606 } else {
607 dev_info(root->bus->bridge,
608 "ACPI _OSC request failed (%s), "
609 "returned control mask: 0x%02x\n",
610 acpi_format_exception(status), flags);
611 pr_info("ACPI _OSC control for PCIe not granted, "
612 "disabling ASPM\n");
613 pcie_no_aspm();
614 }
615 } else {
616 dev_info(root->bus->bridge,
617 "Unable to request _OSC control "
618 "(_OSC support mask: 0x%02x)\n", flags);
619 }
620
621 pci_acpi_add_bus_pm_notifier(device, root->bus);
622 if (device->wakeup.flags.run_wake)
623 device_set_run_wake(root->bus->bridge, true);
624
625 return 0;
626
627end:
628 if (!list_empty(&root->node))
629 list_del(&root->node);
630 kfree(root);
631 return result;
632}
633
634static int acpi_pci_root_start(struct acpi_device *device)
635{
636 struct acpi_pci_root *root = acpi_driver_data(device);
637
638 pci_bus_add_devices(root->bus);
639 return 0;
640}
641
642static int acpi_pci_root_remove(struct acpi_device *device, int type)
643{
644 struct acpi_pci_root *root = acpi_driver_data(device);
645
646 device_set_run_wake(root->bus->bridge, false);
647 pci_acpi_remove_bus_pm_notifier(device);
648
649 kfree(root);
650 return 0;
651}
652
653static int __init acpi_pci_root_init(void)
654{
655 acpi_hest_init();
656
657 if (acpi_pci_disabled)
658 return 0;
659
660 pci_acpi_crs_quirks();
661 if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
662 return -ENODEV;
663
664 return 0;
665}
666
667subsys_initcall(acpi_pci_root_init);
668