blob: a32ba753e4135862825c60690f83f1f9b145fa07 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * File: pci-acpi.c
Len Browna406d9e2005-03-23 16:16:03 -05003 * Purpose: Provide PCI support in ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
David Shaohua Li84df749f2005-03-18 18:53:36 -05005 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/pci.h>
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060013#include <linux/pci_hotplug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
Shaohua Li5fde2442008-07-23 10:32:24 +080015#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/pci-acpi.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010017#include <linux/pm_runtime.h>
Rafael J. Wysocki8b713a82012-10-24 02:08:38 +020018#include <linux/pm_qos.h>
David Shaohua Li0f644742005-03-19 00:15:48 -050019#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Aaron Lu18e94a32015-03-25 14:31:41 +080021/*
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 */
25const 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
Jiang Liuf4b57a32012-06-22 14:55:16 +080030phys_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
Bjorn Helgaasabbfec32014-09-12 15:29:55 -060044static acpi_status decode_type0_hpx_record(union acpi_object *record,
45 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060046{
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
Bjorn Helgaasabbfec32014-09-12 15:29:55 -060074static acpi_status decode_type1_hpx_record(union acpi_object *record,
75 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060076{
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
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600103static acpi_status decode_type2_hpx_record(union acpi_object *record,
104 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600105{
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
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600145static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600146{
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
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600209static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600210{
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
244exit:
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 */
254int 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
Bjorn Helgaas8647ca92015-03-24 11:12:45 -0500260 if (acpi_pci_disabled)
261 return -ENODEV;
262
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600263 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}
292EXPORT_SYMBOL_GPL(pci_get_hp_params);
293
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600294/**
295 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
296 * @work: Work item to handle.
297 */
298static 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 */
313static 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
Markus Elfringff0387c2014-11-10 21:02:17 -0700337 pci_pme_wakeup_bus(pci_dev->subordinate);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600338}
339
340/**
341 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
342 * @dev: PCI root bridge ACPI device.
343 */
344acpi_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 */
354acpi_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
David Shaohua Li0f644742005-03-19 00:15:48 -0500360/*
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
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700380 * choose highest power _SxD or any lower power
David Shaohua Li0f644742005-03-19 00:15:48 -0500381 */
382
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200383static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500384{
Huang Ying448bd852012-06-23 10:23:51 +0800385 int acpi_state, d_max;
David Shaohua Li0f644742005-03-19 00:15:48 -0500386
Huang Ying448bd852012-06-23 10:23:51 +0800387 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);
Shaohua Liab826ca2007-07-20 10:03:22 +0800392 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;
Lin Ming1cc0c992012-04-23 09:03:49 +0800402 case ACPI_STATE_D3_HOT:
Shaohua Liab826ca2007-07-20 10:03:22 +0800403 return PCI_D3hot;
Lin Ming28c21032011-05-04 22:56:43 +0800404 case ACPI_STATE_D3_COLD:
405 return PCI_D3cold;
Shaohua Liab826ca2007-07-20 10:03:22 +0800406 }
407 return PCI_POWER_ERROR;
David Shaohua Li0f644742005-03-19 00:15:48 -0500408}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200409
410static bool acpi_pci_power_manageable(struct pci_dev *dev)
411{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200412 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
413 return adev ? acpi_device_power_manageable(adev) : false;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200414}
David Shaohua Li0f644742005-03-19 00:15:48 -0500415
David Shaohua Lib9131002005-03-19 00:16:18 -0500416static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
417{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200418 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
David Brownell583c3772008-02-22 21:41:51 -0800419 static const u8 state_conv[] = {
420 [PCI_D0] = ACPI_STATE_D0,
421 [PCI_D1] = ACPI_STATE_D1,
422 [PCI_D2] = ACPI_STATE_D2,
Rafael J. Wysocki20dacb72015-05-16 01:55:35 +0200423 [PCI_D3hot] = ACPI_STATE_D3_HOT,
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200424 [PCI_D3cold] = ACPI_STATE_D3_COLD,
David Shaohua Lib9131002005-03-19 00:16:18 -0500425 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200426 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500427
Shaohua Li10b3dca2007-07-20 10:03:25 +0800428 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200429 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200430 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800431
432 switch (state) {
Rafael J. Wysocki8b713a82012-10-24 02:08:38 +0200433 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 }
David Brownell583c3772008-02-22 21:41:51 -0800439 case PCI_D0:
440 case PCI_D1:
441 case PCI_D2:
442 case PCI_D3hot:
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200443 error = acpi_device_set_power(adev, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800444 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200445
446 if (!error)
Lan Tianyud010e572013-07-30 10:32:30 +0800447 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200448 acpi_power_state_string(state_conv[state]));
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200449
450 return error;
David Shaohua Lib9131002005-03-19 00:16:18 -0500451}
452
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200453static bool acpi_pci_can_wakeup(struct pci_dev *dev)
454{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200455 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
456 return adev ? acpi_device_can_wakeup(adev) : false;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200457}
458
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200459static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
460{
461 while (bus->parent) {
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100462 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200463 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
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200472static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
473{
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200474 if (acpi_pci_can_wakeup(dev))
475 return acpi_pm_device_sleep_wake(&dev->dev, enable);
476
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100477 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200478 return 0;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200479}
480
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100481static 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;
Lin Mingb24e5092012-03-27 15:43:25 +0800488 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100489 return;
490 bus = bus->parent;
491 }
492
493 /* We have reached the root bus. */
494 if (bus->bridge)
Lin Mingb24e5092012-03-27 15:43:25 +0800495 acpi_pm_device_run_wake(bus->bridge, enable);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100496}
497
498static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
499{
Huang Ying448bd852012-06-23 10:23:51 +0800500 /*
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)
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100507 return 0;
508
Lin Mingb24e5092012-03-27 15:43:25 +0800509 if (!acpi_pm_device_run_wake(&dev->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100510 return 0;
511
512 acpi_pci_propagate_run_wake(dev->bus, enable);
513 return 0;
514}
515
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100516static 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
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200532static 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,
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200536 .sleep_wake = acpi_pci_sleep_wake,
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100537 .run_wake = acpi_pci_run_wake,
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100538 .need_resume = acpi_pci_need_resume,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200539};
David Shaohua Lib9131002005-03-19 00:16:18 -0500540
Jiang Liu5090d4a2013-04-12 05:44:21 +0000541void acpi_pci_add_bus(struct pci_bus *bus)
542{
Aaron Lue33caa82015-03-25 14:37:06 +0800543 union acpi_object *obj;
544 struct pci_host_bridge *bridge;
545
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200546 if (acpi_pci_disabled || !bus->bridge)
Jiang Liu5090d4a2013-04-12 05:44:21 +0000547 return;
548
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200549 acpi_pci_slot_enumerate(bus);
550 acpiphp_enumerate_slots(bus);
Aaron Lue33caa82015-03-25 14:37:06 +0800551
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);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000569}
570
571void acpi_pci_remove_bus(struct pci_bus *bus)
572{
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200573 if (acpi_pci_disabled || !bus->bridge)
Jiang Liu5090d4a2013-04-12 05:44:21 +0000574 return;
575
Jiang Liu3b63aaa2013-04-12 05:44:26 +0000576 acpiphp_remove_slots(bus);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000577 acpi_pci_slot_remove(bus);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000578}
579
David Shaohua Li84df749f2005-03-18 18:53:36 -0500580/* ACPI bus type */
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100581static struct acpi_device *acpi_pci_find_companion(struct device *dev)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500582{
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200583 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100584 bool check_children;
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200585 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500586
Yijing Wang6788a512014-05-04 12:23:38 +0800587 check_children = pci_is_bridge(pci_dev);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500588 /* Please ref to ACPI spec for the syntax of _ADR */
589 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100590 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100591 check_children);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500592}
593
Aaron Lue33caa82015-03-25 14:37:06 +0800594/**
595 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
596 * @pdev: the PCI device whose delay is to be updated
Srinidhi Kasagar113e0d12015-07-15 14:59:46 +0530597 * @handle: ACPI handle of this device
Aaron Lue33caa82015-03-25 14:37:06 +0800598 *
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 */
614static 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
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100645static void pci_acpi_setup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100646{
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100647 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100648 struct acpi_device *adev = ACPI_COMPANION(dev);
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100649
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100650 if (!adev)
651 return;
652
Aaron Lue33caa82015-03-25 14:37:06 +0800653 pci_acpi_optimize_delay(pci_dev, adev->handle);
654
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100655 pci_acpi_add_pm_notifier(adev, pci_dev);
656 if (!adev->wakeup.flags.valid)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100657 return;
658
659 device_set_wakeup_capable(dev, true);
660 acpi_pci_sleep_wake(pci_dev, false);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100661 if (adev->wakeup.flags.run_wake)
662 device_set_run_wake(dev, true);
663}
664
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100665static void pci_acpi_cleanup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100666{
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100667 struct acpi_device *adev = ACPI_COMPANION(dev);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100668
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100669 if (!adev)
670 return;
671
672 pci_acpi_remove_pm_notifier(adev);
673 if (adev->wakeup.flags.valid) {
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100674 device_set_wakeup_capable(dev, false);
675 device_set_run_wake(dev, false);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100676 }
677}
678
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100679static bool pci_acpi_bus_match(struct device *dev)
680{
Yijing Wang40c368c2013-12-05 19:52:53 +0800681 return dev_is_pci(dev);
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100682}
683
Muthu Kumar9c273b92006-04-28 00:42:21 -0700684static struct acpi_bus_type acpi_pci_bus = {
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100685 .name = "PCI",
686 .match = pci_acpi_bus_match,
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100687 .find_companion = acpi_pci_find_companion,
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100688 .setup = pci_acpi_setup,
689 .cleanup = pci_acpi_cleanup,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500690};
691
Muthu Kumar9c273b92006-04-28 00:42:21 -0700692static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500693{
694 int ret;
695
Bob Moore993958f2009-02-03 15:14:33 +0800696 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Yijing Wange7d45152013-05-28 16:03:46 +0800697 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
Shaohua Lif8993af2007-04-25 11:05:12 +0800698 pci_no_msi();
699 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800700
Bob Moore993958f2009-02-03 15:14:33 +0800701 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Yijing Wange7d45152013-05-28 16:03:46 +0800702 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
Shaohua Li5fde2442008-07-23 10:32:24 +0800703 pcie_no_aspm();
704 }
705
Muthu Kumar9c273b92006-04-28 00:42:21 -0700706 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500707 if (ret)
708 return 0;
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000709
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200710 pci_set_platform_pm(&acpi_pci_platform_pm);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000711 acpi_pci_slot_init();
Jiang Liu3b63aaa2013-04-12 05:44:26 +0000712 acpiphp_init();
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000713
David Shaohua Li84df749f2005-03-18 18:53:36 -0500714 return 0;
715}
Muthu Kumar9c273b92006-04-28 00:42:21 -0700716arch_initcall(acpi_pci_init);