1 /*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI support in ACPI
4 *
5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
7 * Copyright (C) 2004 Intel Corp.
8 */
9
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/pci.h>
13 #include <linux/pci_hotplug.h>
14 #include <linux/module.h>
15 #include <linux/pci-aspm.h>
16 #include <linux/pci-acpi.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/pm_qos.h>
19 #include "pci.h"
20
21 /*
22 * The UUID is defined in the PCI Firmware Specification available here:
23 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
24 */
25 const u8 pci_acpi_dsm_uuid[] = {
26 0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
27 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
28 };
29
acpi_pci_root_get_mcfg_addr(acpi_handle handle)30 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
31 {
32 acpi_status status = AE_NOT_EXIST;
33 unsigned long long mcfg_addr;
34
35 if (handle)
36 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
37 NULL, &mcfg_addr);
38 if (ACPI_FAILURE(status))
39 return 0;
40
41 return (phys_addr_t)mcfg_addr;
42 }
43
decode_type0_hpx_record(union acpi_object * record,struct hotplug_params * hpx)44 static acpi_status decode_type0_hpx_record(union acpi_object *record,
45 struct hotplug_params *hpx)
46 {
47 int i;
48 union acpi_object *fields = record->package.elements;
49 u32 revision = fields[1].integer.value;
50
51 switch (revision) {
52 case 1:
53 if (record->package.count != 6)
54 return AE_ERROR;
55 for (i = 2; i < 6; i++)
56 if (fields[i].type != ACPI_TYPE_INTEGER)
57 return AE_ERROR;
58 hpx->t0 = &hpx->type0_data;
59 hpx->t0->revision = revision;
60 hpx->t0->cache_line_size = fields[2].integer.value;
61 hpx->t0->latency_timer = fields[3].integer.value;
62 hpx->t0->enable_serr = fields[4].integer.value;
63 hpx->t0->enable_perr = fields[5].integer.value;
64 break;
65 default:
66 printk(KERN_WARNING
67 "%s: Type 0 Revision %d record not supported\n",
68 __func__, revision);
69 return AE_ERROR;
70 }
71 return AE_OK;
72 }
73
decode_type1_hpx_record(union acpi_object * record,struct hotplug_params * hpx)74 static acpi_status decode_type1_hpx_record(union acpi_object *record,
75 struct hotplug_params *hpx)
76 {
77 int i;
78 union acpi_object *fields = record->package.elements;
79 u32 revision = fields[1].integer.value;
80
81 switch (revision) {
82 case 1:
83 if (record->package.count != 5)
84 return AE_ERROR;
85 for (i = 2; i < 5; i++)
86 if (fields[i].type != ACPI_TYPE_INTEGER)
87 return AE_ERROR;
88 hpx->t1 = &hpx->type1_data;
89 hpx->t1->revision = revision;
90 hpx->t1->max_mem_read = fields[2].integer.value;
91 hpx->t1->avg_max_split = fields[3].integer.value;
92 hpx->t1->tot_max_split = fields[4].integer.value;
93 break;
94 default:
95 printk(KERN_WARNING
96 "%s: Type 1 Revision %d record not supported\n",
97 __func__, revision);
98 return AE_ERROR;
99 }
100 return AE_OK;
101 }
102
decode_type2_hpx_record(union acpi_object * record,struct hotplug_params * hpx)103 static acpi_status decode_type2_hpx_record(union acpi_object *record,
104 struct hotplug_params *hpx)
105 {
106 int i;
107 union acpi_object *fields = record->package.elements;
108 u32 revision = fields[1].integer.value;
109
110 switch (revision) {
111 case 1:
112 if (record->package.count != 18)
113 return AE_ERROR;
114 for (i = 2; i < 18; i++)
115 if (fields[i].type != ACPI_TYPE_INTEGER)
116 return AE_ERROR;
117 hpx->t2 = &hpx->type2_data;
118 hpx->t2->revision = revision;
119 hpx->t2->unc_err_mask_and = fields[2].integer.value;
120 hpx->t2->unc_err_mask_or = fields[3].integer.value;
121 hpx->t2->unc_err_sever_and = fields[4].integer.value;
122 hpx->t2->unc_err_sever_or = fields[5].integer.value;
123 hpx->t2->cor_err_mask_and = fields[6].integer.value;
124 hpx->t2->cor_err_mask_or = fields[7].integer.value;
125 hpx->t2->adv_err_cap_and = fields[8].integer.value;
126 hpx->t2->adv_err_cap_or = fields[9].integer.value;
127 hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
128 hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
129 hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
130 hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
131 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
132 hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
133 hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
134 hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
135 break;
136 default:
137 printk(KERN_WARNING
138 "%s: Type 2 Revision %d record not supported\n",
139 __func__, revision);
140 return AE_ERROR;
141 }
142 return AE_OK;
143 }
144
acpi_run_hpx(acpi_handle handle,struct hotplug_params * hpx)145 static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
146 {
147 acpi_status status;
148 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
149 union acpi_object *package, *record, *fields;
150 u32 type;
151 int i;
152
153 /* Clear the return buffer with zeros */
154 memset(hpx, 0, sizeof(struct hotplug_params));
155
156 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
157 if (ACPI_FAILURE(status))
158 return status;
159
160 package = (union acpi_object *)buffer.pointer;
161 if (package->type != ACPI_TYPE_PACKAGE) {
162 status = AE_ERROR;
163 goto exit;
164 }
165
166 for (i = 0; i < package->package.count; i++) {
167 record = &package->package.elements[i];
168 if (record->type != ACPI_TYPE_PACKAGE) {
169 status = AE_ERROR;
170 goto exit;
171 }
172
173 fields = record->package.elements;
174 if (fields[0].type != ACPI_TYPE_INTEGER ||
175 fields[1].type != ACPI_TYPE_INTEGER) {
176 status = AE_ERROR;
177 goto exit;
178 }
179
180 type = fields[0].integer.value;
181 switch (type) {
182 case 0:
183 status = decode_type0_hpx_record(record, hpx);
184 if (ACPI_FAILURE(status))
185 goto exit;
186 break;
187 case 1:
188 status = decode_type1_hpx_record(record, hpx);
189 if (ACPI_FAILURE(status))
190 goto exit;
191 break;
192 case 2:
193 status = decode_type2_hpx_record(record, hpx);
194 if (ACPI_FAILURE(status))
195 goto exit;
196 break;
197 default:
198 printk(KERN_ERR "%s: Type %d record not supported\n",
199 __func__, type);
200 status = AE_ERROR;
201 goto exit;
202 }
203 }
204 exit:
205 kfree(buffer.pointer);
206 return status;
207 }
208
acpi_run_hpp(acpi_handle handle,struct hotplug_params * hpp)209 static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
210 {
211 acpi_status status;
212 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
213 union acpi_object *package, *fields;
214 int i;
215
216 memset(hpp, 0, sizeof(struct hotplug_params));
217
218 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
219 if (ACPI_FAILURE(status))
220 return status;
221
222 package = (union acpi_object *) buffer.pointer;
223 if (package->type != ACPI_TYPE_PACKAGE ||
224 package->package.count != 4) {
225 status = AE_ERROR;
226 goto exit;
227 }
228
229 fields = package->package.elements;
230 for (i = 0; i < 4; i++) {
231 if (fields[i].type != ACPI_TYPE_INTEGER) {
232 status = AE_ERROR;
233 goto exit;
234 }
235 }
236
237 hpp->t0 = &hpp->type0_data;
238 hpp->t0->revision = 1;
239 hpp->t0->cache_line_size = fields[0].integer.value;
240 hpp->t0->latency_timer = fields[1].integer.value;
241 hpp->t0->enable_serr = fields[2].integer.value;
242 hpp->t0->enable_perr = fields[3].integer.value;
243
244 exit:
245 kfree(buffer.pointer);
246 return status;
247 }
248
249 /* pci_get_hp_params
250 *
251 * @dev - the pci_dev for which we want parameters
252 * @hpp - allocated by the caller
253 */
pci_get_hp_params(struct pci_dev * dev,struct hotplug_params * hpp)254 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
255 {
256 acpi_status status;
257 acpi_handle handle, phandle;
258 struct pci_bus *pbus;
259
260 if (acpi_pci_disabled)
261 return -ENODEV;
262
263 handle = NULL;
264 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
265 handle = acpi_pci_get_bridge_handle(pbus);
266 if (handle)
267 break;
268 }
269
270 /*
271 * _HPP settings apply to all child buses, until another _HPP is
272 * encountered. If we don't find an _HPP for the input pci dev,
273 * look for it in the parent device scope since that would apply to
274 * this pci dev.
275 */
276 while (handle) {
277 status = acpi_run_hpx(handle, hpp);
278 if (ACPI_SUCCESS(status))
279 return 0;
280 status = acpi_run_hpp(handle, hpp);
281 if (ACPI_SUCCESS(status))
282 return 0;
283 if (acpi_is_root_bridge(handle))
284 break;
285 status = acpi_get_parent(handle, &phandle);
286 if (ACPI_FAILURE(status))
287 break;
288 handle = phandle;
289 }
290 return -ENODEV;
291 }
292 EXPORT_SYMBOL_GPL(pci_get_hp_params);
293
294 /**
295 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
296 * @work: Work item to handle.
297 */
pci_acpi_wake_bus(struct work_struct * work)298 static void pci_acpi_wake_bus(struct work_struct *work)
299 {
300 struct acpi_device *adev;
301 struct acpi_pci_root *root;
302
303 adev = container_of(work, struct acpi_device, wakeup.context.work);
304 root = acpi_driver_data(adev);
305 pci_pme_wakeup_bus(root->bus);
306 }
307
308 /**
309 * pci_acpi_wake_dev - PCI device wakeup notification work function.
310 * @handle: ACPI handle of a device the notification is for.
311 * @work: Work item to handle.
312 */
pci_acpi_wake_dev(struct work_struct * work)313 static void pci_acpi_wake_dev(struct work_struct *work)
314 {
315 struct acpi_device_wakeup_context *context;
316 struct pci_dev *pci_dev;
317
318 context = container_of(work, struct acpi_device_wakeup_context, work);
319 pci_dev = to_pci_dev(context->dev);
320
321 if (pci_dev->pme_poll)
322 pci_dev->pme_poll = false;
323
324 if (pci_dev->current_state == PCI_D3cold) {
325 pci_wakeup_event(pci_dev);
326 pm_runtime_resume(&pci_dev->dev);
327 return;
328 }
329
330 /* Clear PME Status if set. */
331 if (pci_dev->pme_support)
332 pci_check_pme_status(pci_dev);
333
334 pci_wakeup_event(pci_dev);
335 pm_runtime_resume(&pci_dev->dev);
336
337 pci_pme_wakeup_bus(pci_dev->subordinate);
338 }
339
340 /**
341 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
342 * @dev: PCI root bridge ACPI device.
343 */
pci_acpi_add_bus_pm_notifier(struct acpi_device * dev)344 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
345 {
346 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
347 }
348
349 /**
350 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
351 * @dev: ACPI device to add the notifier for.
352 * @pci_dev: PCI device to check for the PME status if an event is signaled.
353 */
pci_acpi_add_pm_notifier(struct acpi_device * dev,struct pci_dev * pci_dev)354 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
355 struct pci_dev *pci_dev)
356 {
357 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
358 }
359
360 /*
361 * _SxD returns the D-state with the highest power
362 * (lowest D-state number) supported in the S-state "x".
363 *
364 * If the devices does not have a _PRW
365 * (Power Resources for Wake) supporting system wakeup from "x"
366 * then the OS is free to choose a lower power (higher number
367 * D-state) than the return value from _SxD.
368 *
369 * But if _PRW is enabled at S-state "x", the OS
370 * must not choose a power lower than _SxD --
371 * unless the device has an _SxW method specifying
372 * the lowest power (highest D-state number) the device
373 * may enter while still able to wake the system.
374 *
375 * ie. depending on global OS policy:
376 *
377 * if (_PRW at S-state x)
378 * choose from highest power _SxD to lowest power _SxW
379 * else // no _PRW at S-state x
380 * choose highest power _SxD or any lower power
381 */
382
acpi_pci_choose_state(struct pci_dev * pdev)383 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
384 {
385 int acpi_state, d_max;
386
387 if (pdev->no_d3cold)
388 d_max = ACPI_STATE_D3_HOT;
389 else
390 d_max = ACPI_STATE_D3_COLD;
391 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
392 if (acpi_state < 0)
393 return PCI_POWER_ERROR;
394
395 switch (acpi_state) {
396 case ACPI_STATE_D0:
397 return PCI_D0;
398 case ACPI_STATE_D1:
399 return PCI_D1;
400 case ACPI_STATE_D2:
401 return PCI_D2;
402 case ACPI_STATE_D3_HOT:
403 return PCI_D3hot;
404 case ACPI_STATE_D3_COLD:
405 return PCI_D3cold;
406 }
407 return PCI_POWER_ERROR;
408 }
409
acpi_pci_power_manageable(struct pci_dev * dev)410 static bool acpi_pci_power_manageable(struct pci_dev *dev)
411 {
412 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
413 return adev ? acpi_device_power_manageable(adev) : false;
414 }
415
acpi_pci_set_power_state(struct pci_dev * dev,pci_power_t state)416 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
417 {
418 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
419 static const u8 state_conv[] = {
420 [PCI_D0] = ACPI_STATE_D0,
421 [PCI_D1] = ACPI_STATE_D1,
422 [PCI_D2] = ACPI_STATE_D2,
423 [PCI_D3hot] = ACPI_STATE_D3_HOT,
424 [PCI_D3cold] = ACPI_STATE_D3_COLD,
425 };
426 int error = -EINVAL;
427
428 /* If the ACPI device has _EJ0, ignore the device */
429 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
430 return -ENODEV;
431
432 switch (state) {
433 case PCI_D3cold:
434 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
435 PM_QOS_FLAGS_ALL) {
436 error = -EBUSY;
437 break;
438 }
439 case PCI_D0:
440 case PCI_D1:
441 case PCI_D2:
442 case PCI_D3hot:
443 error = acpi_device_set_power(adev, state_conv[state]);
444 }
445
446 if (!error)
447 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
448 acpi_power_state_string(state_conv[state]));
449
450 return error;
451 }
452
acpi_pci_can_wakeup(struct pci_dev * dev)453 static bool acpi_pci_can_wakeup(struct pci_dev *dev)
454 {
455 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
456 return adev ? acpi_device_can_wakeup(adev) : false;
457 }
458
acpi_pci_propagate_wakeup_enable(struct pci_bus * bus,bool enable)459 static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
460 {
461 while (bus->parent) {
462 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
463 return;
464 bus = bus->parent;
465 }
466
467 /* We have reached the root bus. */
468 if (bus->bridge)
469 acpi_pm_device_sleep_wake(bus->bridge, enable);
470 }
471
acpi_pci_sleep_wake(struct pci_dev * dev,bool enable)472 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
473 {
474 if (acpi_pci_can_wakeup(dev))
475 return acpi_pm_device_sleep_wake(&dev->dev, enable);
476
477 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
478 return 0;
479 }
480
acpi_pci_propagate_run_wake(struct pci_bus * bus,bool enable)481 static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
482 {
483 while (bus->parent) {
484 struct pci_dev *bridge = bus->self;
485
486 if (bridge->pme_interrupt)
487 return;
488 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
489 return;
490 bus = bus->parent;
491 }
492
493 /* We have reached the root bus. */
494 if (bus->bridge)
495 acpi_pm_device_run_wake(bus->bridge, enable);
496 }
497
acpi_pci_run_wake(struct pci_dev * dev,bool enable)498 static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
499 {
500 /*
501 * Per PCI Express Base Specification Revision 2.0 section
502 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
503 * waking up to power on the main link even if there is PME
504 * support for D3cold
505 */
506 if (dev->pme_interrupt && !dev->runtime_d3cold)
507 return 0;
508
509 if (!acpi_pm_device_run_wake(&dev->dev, enable))
510 return 0;
511
512 acpi_pci_propagate_run_wake(dev->bus, enable);
513 return 0;
514 }
515
acpi_pci_need_resume(struct pci_dev * dev)516 static bool acpi_pci_need_resume(struct pci_dev *dev)
517 {
518 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
519
520 if (!adev || !acpi_device_power_manageable(adev))
521 return false;
522
523 if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
524 return true;
525
526 if (acpi_target_system_state() == ACPI_STATE_S0)
527 return false;
528
529 return !!adev->power.flags.dsw_present;
530 }
531
532 static struct pci_platform_pm_ops acpi_pci_platform_pm = {
533 .is_manageable = acpi_pci_power_manageable,
534 .set_state = acpi_pci_set_power_state,
535 .choose_state = acpi_pci_choose_state,
536 .sleep_wake = acpi_pci_sleep_wake,
537 .run_wake = acpi_pci_run_wake,
538 .need_resume = acpi_pci_need_resume,
539 };
540
acpi_pci_add_bus(struct pci_bus * bus)541 void acpi_pci_add_bus(struct pci_bus *bus)
542 {
543 union acpi_object *obj;
544 struct pci_host_bridge *bridge;
545
546 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
547 return;
548
549 acpi_pci_slot_enumerate(bus);
550 acpiphp_enumerate_slots(bus);
551
552 /*
553 * For a host bridge, check its _DSM for function 8 and if
554 * that is available, mark it in pci_host_bridge.
555 */
556 if (!pci_is_root_bus(bus))
557 return;
558
559 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
560 RESET_DELAY_DSM, NULL);
561 if (!obj)
562 return;
563
564 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
565 bridge = pci_find_host_bridge(bus);
566 bridge->ignore_reset_delay = 1;
567 }
568 ACPI_FREE(obj);
569 }
570
acpi_pci_remove_bus(struct pci_bus * bus)571 void acpi_pci_remove_bus(struct pci_bus *bus)
572 {
573 if (acpi_pci_disabled || !bus->bridge)
574 return;
575
576 acpiphp_remove_slots(bus);
577 acpi_pci_slot_remove(bus);
578 }
579
580 /* ACPI bus type */
acpi_pci_find_companion(struct device * dev)581 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
582 {
583 struct pci_dev *pci_dev = to_pci_dev(dev);
584 bool check_children;
585 u64 addr;
586
587 check_children = pci_is_bridge(pci_dev);
588 /* Please ref to ACPI spec for the syntax of _ADR */
589 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
590 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
591 check_children);
592 }
593
594 /**
595 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
596 * @pdev: the PCI device whose delay is to be updated
597 * @handle: ACPI handle of this device
598 *
599 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
600 * control method of either the device itself or the PCI host bridge.
601 *
602 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
603 * host bridge. If it returns one, the OS may assume that all devices in
604 * the hierarchy have already completed power-on reset delays.
605 *
606 * Function 9, "Device Readiness Durations," applies only to the object
607 * where it is located. It returns delay durations required after various
608 * events if the device requires less time than the spec requires. Delays
609 * from this function take precedence over the Reset Delay function.
610 *
611 * These _DSM functions are defined by the draft ECN of January 28, 2014,
612 * titled "ACPI additions for FW latency optimizations."
613 */
pci_acpi_optimize_delay(struct pci_dev * pdev,acpi_handle handle)614 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
615 acpi_handle handle)
616 {
617 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
618 int value;
619 union acpi_object *obj, *elements;
620
621 if (bridge->ignore_reset_delay)
622 pdev->d3cold_delay = 0;
623
624 obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
625 FUNCTION_DELAY_DSM, NULL);
626 if (!obj)
627 return;
628
629 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
630 elements = obj->package.elements;
631 if (elements[0].type == ACPI_TYPE_INTEGER) {
632 value = (int)elements[0].integer.value / 1000;
633 if (value < PCI_PM_D3COLD_WAIT)
634 pdev->d3cold_delay = value;
635 }
636 if (elements[3].type == ACPI_TYPE_INTEGER) {
637 value = (int)elements[3].integer.value / 1000;
638 if (value < PCI_PM_D3_WAIT)
639 pdev->d3_delay = value;
640 }
641 }
642 ACPI_FREE(obj);
643 }
644
pci_acpi_setup(struct device * dev)645 static void pci_acpi_setup(struct device *dev)
646 {
647 struct pci_dev *pci_dev = to_pci_dev(dev);
648 struct acpi_device *adev = ACPI_COMPANION(dev);
649
650 if (!adev)
651 return;
652
653 pci_acpi_optimize_delay(pci_dev, adev->handle);
654
655 pci_acpi_add_pm_notifier(adev, pci_dev);
656 if (!adev->wakeup.flags.valid)
657 return;
658
659 device_set_wakeup_capable(dev, true);
660 acpi_pci_sleep_wake(pci_dev, false);
661 if (adev->wakeup.flags.run_wake)
662 device_set_run_wake(dev, true);
663 }
664
pci_acpi_cleanup(struct device * dev)665 static void pci_acpi_cleanup(struct device *dev)
666 {
667 struct acpi_device *adev = ACPI_COMPANION(dev);
668
669 if (!adev)
670 return;
671
672 pci_acpi_remove_pm_notifier(adev);
673 if (adev->wakeup.flags.valid) {
674 device_set_wakeup_capable(dev, false);
675 device_set_run_wake(dev, false);
676 }
677 }
678
pci_acpi_bus_match(struct device * dev)679 static bool pci_acpi_bus_match(struct device *dev)
680 {
681 return dev_is_pci(dev);
682 }
683
684 static struct acpi_bus_type acpi_pci_bus = {
685 .name = "PCI",
686 .match = pci_acpi_bus_match,
687 .find_companion = acpi_pci_find_companion,
688 .setup = pci_acpi_setup,
689 .cleanup = pci_acpi_cleanup,
690 };
691
acpi_pci_init(void)692 static int __init acpi_pci_init(void)
693 {
694 int ret;
695
696 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
697 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
698 pci_no_msi();
699 }
700
701 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
702 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
703 pcie_no_aspm();
704 }
705
706 ret = register_acpi_bus_type(&acpi_pci_bus);
707 if (ret)
708 return 0;
709
710 pci_set_platform_pm(&acpi_pci_platform_pm);
711 acpi_pci_slot_init();
712 acpiphp_init();
713
714 return 0;
715 }
716 arch_initcall(acpi_pci_init);
717