blob: 9a033e8ee9a438317cc67aecf90ff7d8793846a4 [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>
Suravee Suthikulpanit471036b2015-12-10 08:55:27 -080012#include <linux/irqdomain.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/pci.h>
Suravee Suthikulpanit471036b2015-12-10 08:55:27 -080014#include <linux/msi.h>
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060015#include <linux/pci_hotplug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/module.h>
Shaohua Li5fde2442008-07-23 10:32:24 +080017#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/pci-acpi.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010019#include <linux/pm_runtime.h>
Rafael J. Wysocki8b713a82012-10-24 02:08:38 +020020#include <linux/pm_qos.h>
David Shaohua Li0f644742005-03-19 00:15:48 -050021#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Aaron Lu18e94a32015-03-25 14:31:41 +080023/*
24 * The UUID is defined in the PCI Firmware Specification available here:
25 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
26 */
27const u8 pci_acpi_dsm_uuid[] = {
28 0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
29 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
30};
31
Jiang Liuf4b57a32012-06-22 14:55:16 +080032phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
33{
34 acpi_status status = AE_NOT_EXIST;
35 unsigned long long mcfg_addr;
36
37 if (handle)
38 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
39 NULL, &mcfg_addr);
40 if (ACPI_FAILURE(status))
41 return 0;
42
43 return (phys_addr_t)mcfg_addr;
44}
45
Bjorn Helgaasabbfec32014-09-12 15:29:55 -060046static acpi_status decode_type0_hpx_record(union acpi_object *record,
47 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060048{
49 int i;
50 union acpi_object *fields = record->package.elements;
51 u32 revision = fields[1].integer.value;
52
53 switch (revision) {
54 case 1:
55 if (record->package.count != 6)
56 return AE_ERROR;
57 for (i = 2; i < 6; i++)
58 if (fields[i].type != ACPI_TYPE_INTEGER)
59 return AE_ERROR;
60 hpx->t0 = &hpx->type0_data;
61 hpx->t0->revision = revision;
62 hpx->t0->cache_line_size = fields[2].integer.value;
63 hpx->t0->latency_timer = fields[3].integer.value;
64 hpx->t0->enable_serr = fields[4].integer.value;
65 hpx->t0->enable_perr = fields[5].integer.value;
66 break;
67 default:
68 printk(KERN_WARNING
69 "%s: Type 0 Revision %d record not supported\n",
70 __func__, revision);
71 return AE_ERROR;
72 }
73 return AE_OK;
74}
75
Bjorn Helgaasabbfec32014-09-12 15:29:55 -060076static acpi_status decode_type1_hpx_record(union acpi_object *record,
77 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -060078{
79 int i;
80 union acpi_object *fields = record->package.elements;
81 u32 revision = fields[1].integer.value;
82
83 switch (revision) {
84 case 1:
85 if (record->package.count != 5)
86 return AE_ERROR;
87 for (i = 2; i < 5; i++)
88 if (fields[i].type != ACPI_TYPE_INTEGER)
89 return AE_ERROR;
90 hpx->t1 = &hpx->type1_data;
91 hpx->t1->revision = revision;
92 hpx->t1->max_mem_read = fields[2].integer.value;
93 hpx->t1->avg_max_split = fields[3].integer.value;
94 hpx->t1->tot_max_split = fields[4].integer.value;
95 break;
96 default:
97 printk(KERN_WARNING
98 "%s: Type 1 Revision %d record not supported\n",
99 __func__, revision);
100 return AE_ERROR;
101 }
102 return AE_OK;
103}
104
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600105static acpi_status decode_type2_hpx_record(union acpi_object *record,
106 struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600107{
108 int i;
109 union acpi_object *fields = record->package.elements;
110 u32 revision = fields[1].integer.value;
111
112 switch (revision) {
113 case 1:
114 if (record->package.count != 18)
115 return AE_ERROR;
116 for (i = 2; i < 18; i++)
117 if (fields[i].type != ACPI_TYPE_INTEGER)
118 return AE_ERROR;
119 hpx->t2 = &hpx->type2_data;
120 hpx->t2->revision = revision;
121 hpx->t2->unc_err_mask_and = fields[2].integer.value;
122 hpx->t2->unc_err_mask_or = fields[3].integer.value;
123 hpx->t2->unc_err_sever_and = fields[4].integer.value;
124 hpx->t2->unc_err_sever_or = fields[5].integer.value;
125 hpx->t2->cor_err_mask_and = fields[6].integer.value;
126 hpx->t2->cor_err_mask_or = fields[7].integer.value;
127 hpx->t2->adv_err_cap_and = fields[8].integer.value;
128 hpx->t2->adv_err_cap_or = fields[9].integer.value;
129 hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
130 hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
131 hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
132 hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
133 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
134 hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
135 hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
136 hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
137 break;
138 default:
139 printk(KERN_WARNING
140 "%s: Type 2 Revision %d record not supported\n",
141 __func__, revision);
142 return AE_ERROR;
143 }
144 return AE_OK;
145}
146
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600147static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600148{
149 acpi_status status;
150 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
151 union acpi_object *package, *record, *fields;
152 u32 type;
153 int i;
154
155 /* Clear the return buffer with zeros */
156 memset(hpx, 0, sizeof(struct hotplug_params));
157
158 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
159 if (ACPI_FAILURE(status))
160 return status;
161
162 package = (union acpi_object *)buffer.pointer;
163 if (package->type != ACPI_TYPE_PACKAGE) {
164 status = AE_ERROR;
165 goto exit;
166 }
167
168 for (i = 0; i < package->package.count; i++) {
169 record = &package->package.elements[i];
170 if (record->type != ACPI_TYPE_PACKAGE) {
171 status = AE_ERROR;
172 goto exit;
173 }
174
175 fields = record->package.elements;
176 if (fields[0].type != ACPI_TYPE_INTEGER ||
177 fields[1].type != ACPI_TYPE_INTEGER) {
178 status = AE_ERROR;
179 goto exit;
180 }
181
182 type = fields[0].integer.value;
183 switch (type) {
184 case 0:
185 status = decode_type0_hpx_record(record, hpx);
186 if (ACPI_FAILURE(status))
187 goto exit;
188 break;
189 case 1:
190 status = decode_type1_hpx_record(record, hpx);
191 if (ACPI_FAILURE(status))
192 goto exit;
193 break;
194 case 2:
195 status = decode_type2_hpx_record(record, hpx);
196 if (ACPI_FAILURE(status))
197 goto exit;
198 break;
199 default:
200 printk(KERN_ERR "%s: Type %d record not supported\n",
201 __func__, type);
202 status = AE_ERROR;
203 goto exit;
204 }
205 }
206 exit:
207 kfree(buffer.pointer);
208 return status;
209}
210
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600211static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600212{
213 acpi_status status;
214 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
215 union acpi_object *package, *fields;
216 int i;
217
218 memset(hpp, 0, sizeof(struct hotplug_params));
219
220 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
221 if (ACPI_FAILURE(status))
222 return status;
223
224 package = (union acpi_object *) buffer.pointer;
225 if (package->type != ACPI_TYPE_PACKAGE ||
226 package->package.count != 4) {
227 status = AE_ERROR;
228 goto exit;
229 }
230
231 fields = package->package.elements;
232 for (i = 0; i < 4; i++) {
233 if (fields[i].type != ACPI_TYPE_INTEGER) {
234 status = AE_ERROR;
235 goto exit;
236 }
237 }
238
239 hpp->t0 = &hpp->type0_data;
240 hpp->t0->revision = 1;
241 hpp->t0->cache_line_size = fields[0].integer.value;
242 hpp->t0->latency_timer = fields[1].integer.value;
243 hpp->t0->enable_serr = fields[2].integer.value;
244 hpp->t0->enable_perr = fields[3].integer.value;
245
246exit:
247 kfree(buffer.pointer);
248 return status;
249}
250
251/* pci_get_hp_params
252 *
253 * @dev - the pci_dev for which we want parameters
254 * @hpp - allocated by the caller
255 */
256int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
257{
258 acpi_status status;
259 acpi_handle handle, phandle;
260 struct pci_bus *pbus;
261
Bjorn Helgaas8647ca92015-03-24 11:12:45 -0500262 if (acpi_pci_disabled)
263 return -ENODEV;
264
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600265 handle = NULL;
266 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
267 handle = acpi_pci_get_bridge_handle(pbus);
268 if (handle)
269 break;
270 }
271
272 /*
273 * _HPP settings apply to all child buses, until another _HPP is
274 * encountered. If we don't find an _HPP for the input pci dev,
275 * look for it in the parent device scope since that would apply to
276 * this pci dev.
277 */
278 while (handle) {
279 status = acpi_run_hpx(handle, hpp);
280 if (ACPI_SUCCESS(status))
281 return 0;
282 status = acpi_run_hpp(handle, hpp);
283 if (ACPI_SUCCESS(status))
284 return 0;
285 if (acpi_is_root_bridge(handle))
286 break;
287 status = acpi_get_parent(handle, &phandle);
288 if (ACPI_FAILURE(status))
289 break;
290 handle = phandle;
291 }
292 return -ENODEV;
293}
294EXPORT_SYMBOL_GPL(pci_get_hp_params);
295
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600296/**
297 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
298 * @work: Work item to handle.
299 */
300static void pci_acpi_wake_bus(struct work_struct *work)
301{
302 struct acpi_device *adev;
303 struct acpi_pci_root *root;
304
305 adev = container_of(work, struct acpi_device, wakeup.context.work);
306 root = acpi_driver_data(adev);
307 pci_pme_wakeup_bus(root->bus);
308}
309
310/**
311 * pci_acpi_wake_dev - PCI device wakeup notification work function.
312 * @handle: ACPI handle of a device the notification is for.
313 * @work: Work item to handle.
314 */
315static void pci_acpi_wake_dev(struct work_struct *work)
316{
317 struct acpi_device_wakeup_context *context;
318 struct pci_dev *pci_dev;
319
320 context = container_of(work, struct acpi_device_wakeup_context, work);
321 pci_dev = to_pci_dev(context->dev);
322
323 if (pci_dev->pme_poll)
324 pci_dev->pme_poll = false;
325
326 if (pci_dev->current_state == PCI_D3cold) {
327 pci_wakeup_event(pci_dev);
328 pm_runtime_resume(&pci_dev->dev);
329 return;
330 }
331
332 /* Clear PME Status if set. */
333 if (pci_dev->pme_support)
334 pci_check_pme_status(pci_dev);
335
336 pci_wakeup_event(pci_dev);
337 pm_runtime_resume(&pci_dev->dev);
338
Markus Elfringff0387c2014-11-10 21:02:17 -0700339 pci_pme_wakeup_bus(pci_dev->subordinate);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600340}
341
342/**
343 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
344 * @dev: PCI root bridge ACPI device.
345 */
346acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
347{
348 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
349}
350
351/**
352 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
353 * @dev: ACPI device to add the notifier for.
354 * @pci_dev: PCI device to check for the PME status if an event is signaled.
355 */
356acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
357 struct pci_dev *pci_dev)
358{
359 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
360}
361
David Shaohua Li0f644742005-03-19 00:15:48 -0500362/*
363 * _SxD returns the D-state with the highest power
364 * (lowest D-state number) supported in the S-state "x".
365 *
366 * If the devices does not have a _PRW
367 * (Power Resources for Wake) supporting system wakeup from "x"
368 * then the OS is free to choose a lower power (higher number
369 * D-state) than the return value from _SxD.
370 *
371 * But if _PRW is enabled at S-state "x", the OS
372 * must not choose a power lower than _SxD --
373 * unless the device has an _SxW method specifying
374 * the lowest power (highest D-state number) the device
375 * may enter while still able to wake the system.
376 *
377 * ie. depending on global OS policy:
378 *
379 * if (_PRW at S-state x)
380 * choose from highest power _SxD to lowest power _SxW
381 * else // no _PRW at S-state x
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700382 * choose highest power _SxD or any lower power
David Shaohua Li0f644742005-03-19 00:15:48 -0500383 */
384
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200385static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500386{
Huang Ying448bd852012-06-23 10:23:51 +0800387 int acpi_state, d_max;
David Shaohua Li0f644742005-03-19 00:15:48 -0500388
Huang Ying448bd852012-06-23 10:23:51 +0800389 if (pdev->no_d3cold)
390 d_max = ACPI_STATE_D3_HOT;
391 else
392 d_max = ACPI_STATE_D3_COLD;
393 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
Shaohua Liab826ca2007-07-20 10:03:22 +0800394 if (acpi_state < 0)
395 return PCI_POWER_ERROR;
396
397 switch (acpi_state) {
398 case ACPI_STATE_D0:
399 return PCI_D0;
400 case ACPI_STATE_D1:
401 return PCI_D1;
402 case ACPI_STATE_D2:
403 return PCI_D2;
Lin Ming1cc0c992012-04-23 09:03:49 +0800404 case ACPI_STATE_D3_HOT:
Shaohua Liab826ca2007-07-20 10:03:22 +0800405 return PCI_D3hot;
Lin Ming28c21032011-05-04 22:56:43 +0800406 case ACPI_STATE_D3_COLD:
407 return PCI_D3cold;
Shaohua Liab826ca2007-07-20 10:03:22 +0800408 }
409 return PCI_POWER_ERROR;
David Shaohua Li0f644742005-03-19 00:15:48 -0500410}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200411
412static bool acpi_pci_power_manageable(struct pci_dev *dev)
413{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200414 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
415 return adev ? acpi_device_power_manageable(adev) : false;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200416}
David Shaohua Li0f644742005-03-19 00:15:48 -0500417
David Shaohua Lib9131002005-03-19 00:16:18 -0500418static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
419{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200420 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
David Brownell583c3772008-02-22 21:41:51 -0800421 static const u8 state_conv[] = {
422 [PCI_D0] = ACPI_STATE_D0,
423 [PCI_D1] = ACPI_STATE_D1,
424 [PCI_D2] = ACPI_STATE_D2,
Rafael J. Wysocki20dacb72015-05-16 01:55:35 +0200425 [PCI_D3hot] = ACPI_STATE_D3_HOT,
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200426 [PCI_D3cold] = ACPI_STATE_D3_COLD,
David Shaohua Lib9131002005-03-19 00:16:18 -0500427 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200428 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500429
Shaohua Li10b3dca2007-07-20 10:03:25 +0800430 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200431 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200432 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800433
434 switch (state) {
Rafael J. Wysocki8b713a82012-10-24 02:08:38 +0200435 case PCI_D3cold:
436 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
437 PM_QOS_FLAGS_ALL) {
438 error = -EBUSY;
439 break;
440 }
David Brownell583c3772008-02-22 21:41:51 -0800441 case PCI_D0:
442 case PCI_D1:
443 case PCI_D2:
444 case PCI_D3hot:
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200445 error = acpi_device_set_power(adev, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800446 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200447
448 if (!error)
Lan Tianyud010e572013-07-30 10:32:30 +0800449 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200450 acpi_power_state_string(state_conv[state]));
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200451
452 return error;
David Shaohua Lib9131002005-03-19 00:16:18 -0500453}
454
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200455static bool acpi_pci_can_wakeup(struct pci_dev *dev)
456{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200457 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
458 return adev ? acpi_device_can_wakeup(adev) : false;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200459}
460
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200461static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
462{
463 while (bus->parent) {
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100464 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200465 return;
466 bus = bus->parent;
467 }
468
469 /* We have reached the root bus. */
470 if (bus->bridge)
471 acpi_pm_device_sleep_wake(bus->bridge, enable);
472}
473
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200474static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
475{
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200476 if (acpi_pci_can_wakeup(dev))
477 return acpi_pm_device_sleep_wake(&dev->dev, enable);
478
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100479 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200480 return 0;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200481}
482
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100483static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
484{
485 while (bus->parent) {
486 struct pci_dev *bridge = bus->self;
487
488 if (bridge->pme_interrupt)
489 return;
Lin Mingb24e5092012-03-27 15:43:25 +0800490 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100491 return;
492 bus = bus->parent;
493 }
494
495 /* We have reached the root bus. */
496 if (bus->bridge)
Lin Mingb24e5092012-03-27 15:43:25 +0800497 acpi_pm_device_run_wake(bus->bridge, enable);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100498}
499
500static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
501{
Huang Ying448bd852012-06-23 10:23:51 +0800502 /*
503 * Per PCI Express Base Specification Revision 2.0 section
504 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
505 * waking up to power on the main link even if there is PME
506 * support for D3cold
507 */
508 if (dev->pme_interrupt && !dev->runtime_d3cold)
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100509 return 0;
510
Lin Mingb24e5092012-03-27 15:43:25 +0800511 if (!acpi_pm_device_run_wake(&dev->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100512 return 0;
513
514 acpi_pci_propagate_run_wake(dev->bus, enable);
515 return 0;
516}
517
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100518static bool acpi_pci_need_resume(struct pci_dev *dev)
519{
520 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
521
522 if (!adev || !acpi_device_power_manageable(adev))
523 return false;
524
525 if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
526 return true;
527
528 if (acpi_target_system_state() == ACPI_STATE_S0)
529 return false;
530
531 return !!adev->power.flags.dsw_present;
532}
533
Julia Lawall299f2ff2015-12-06 17:33:45 +0100534static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200535 .is_manageable = acpi_pci_power_manageable,
536 .set_state = acpi_pci_set_power_state,
537 .choose_state = acpi_pci_choose_state,
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200538 .sleep_wake = acpi_pci_sleep_wake,
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100539 .run_wake = acpi_pci_run_wake,
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100540 .need_resume = acpi_pci_need_resume,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200541};
David Shaohua Lib9131002005-03-19 00:16:18 -0500542
Jiang Liu5090d4a2013-04-12 05:44:21 +0000543void acpi_pci_add_bus(struct pci_bus *bus)
544{
Aaron Lue33caa82015-03-25 14:37:06 +0800545 union acpi_object *obj;
546 struct pci_host_bridge *bridge;
547
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200548 if (acpi_pci_disabled || !bus->bridge)
Jiang Liu5090d4a2013-04-12 05:44:21 +0000549 return;
550
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200551 acpi_pci_slot_enumerate(bus);
552 acpiphp_enumerate_slots(bus);
Aaron Lue33caa82015-03-25 14:37:06 +0800553
554 /*
555 * For a host bridge, check its _DSM for function 8 and if
556 * that is available, mark it in pci_host_bridge.
557 */
558 if (!pci_is_root_bus(bus))
559 return;
560
561 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
562 RESET_DELAY_DSM, NULL);
563 if (!obj)
564 return;
565
566 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
567 bridge = pci_find_host_bridge(bus);
568 bridge->ignore_reset_delay = 1;
569 }
570 ACPI_FREE(obj);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000571}
572
573void acpi_pci_remove_bus(struct pci_bus *bus)
574{
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200575 if (acpi_pci_disabled || !bus->bridge)
Jiang Liu5090d4a2013-04-12 05:44:21 +0000576 return;
577
Jiang Liu3b63aaa2013-04-12 05:44:26 +0000578 acpiphp_remove_slots(bus);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000579 acpi_pci_slot_remove(bus);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000580}
581
David Shaohua Li84df749f2005-03-18 18:53:36 -0500582/* ACPI bus type */
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100583static struct acpi_device *acpi_pci_find_companion(struct device *dev)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500584{
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200585 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100586 bool check_children;
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200587 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500588
Yijing Wang6788a512014-05-04 12:23:38 +0800589 check_children = pci_is_bridge(pci_dev);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500590 /* Please ref to ACPI spec for the syntax of _ADR */
591 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100592 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100593 check_children);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500594}
595
Aaron Lue33caa82015-03-25 14:37:06 +0800596/**
597 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
598 * @pdev: the PCI device whose delay is to be updated
Srinidhi Kasagar113e0d12015-07-15 14:59:46 +0530599 * @handle: ACPI handle of this device
Aaron Lue33caa82015-03-25 14:37:06 +0800600 *
601 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
602 * control method of either the device itself or the PCI host bridge.
603 *
604 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
605 * host bridge. If it returns one, the OS may assume that all devices in
606 * the hierarchy have already completed power-on reset delays.
607 *
608 * Function 9, "Device Readiness Durations," applies only to the object
609 * where it is located. It returns delay durations required after various
610 * events if the device requires less time than the spec requires. Delays
611 * from this function take precedence over the Reset Delay function.
612 *
613 * These _DSM functions are defined by the draft ECN of January 28, 2014,
614 * titled "ACPI additions for FW latency optimizations."
615 */
616static void pci_acpi_optimize_delay(struct pci_dev *pdev,
617 acpi_handle handle)
618{
619 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
620 int value;
621 union acpi_object *obj, *elements;
622
623 if (bridge->ignore_reset_delay)
624 pdev->d3cold_delay = 0;
625
626 obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
627 FUNCTION_DELAY_DSM, NULL);
628 if (!obj)
629 return;
630
631 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
632 elements = obj->package.elements;
633 if (elements[0].type == ACPI_TYPE_INTEGER) {
634 value = (int)elements[0].integer.value / 1000;
635 if (value < PCI_PM_D3COLD_WAIT)
636 pdev->d3cold_delay = value;
637 }
638 if (elements[3].type == ACPI_TYPE_INTEGER) {
639 value = (int)elements[3].integer.value / 1000;
640 if (value < PCI_PM_D3_WAIT)
641 pdev->d3_delay = value;
642 }
643 }
644 ACPI_FREE(obj);
645}
646
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100647static void pci_acpi_setup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100648{
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100649 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100650 struct acpi_device *adev = ACPI_COMPANION(dev);
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100651
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100652 if (!adev)
653 return;
654
Aaron Lue33caa82015-03-25 14:37:06 +0800655 pci_acpi_optimize_delay(pci_dev, adev->handle);
656
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100657 pci_acpi_add_pm_notifier(adev, pci_dev);
658 if (!adev->wakeup.flags.valid)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100659 return;
660
661 device_set_wakeup_capable(dev, true);
662 acpi_pci_sleep_wake(pci_dev, false);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100663 if (adev->wakeup.flags.run_wake)
664 device_set_run_wake(dev, true);
665}
666
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100667static void pci_acpi_cleanup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100668{
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100669 struct acpi_device *adev = ACPI_COMPANION(dev);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100670
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100671 if (!adev)
672 return;
673
674 pci_acpi_remove_pm_notifier(adev);
675 if (adev->wakeup.flags.valid) {
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100676 device_set_wakeup_capable(dev, false);
677 device_set_run_wake(dev, false);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100678 }
679}
680
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100681static bool pci_acpi_bus_match(struct device *dev)
682{
Yijing Wang40c368c2013-12-05 19:52:53 +0800683 return dev_is_pci(dev);
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100684}
685
Muthu Kumar9c273b92006-04-28 00:42:21 -0700686static struct acpi_bus_type acpi_pci_bus = {
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100687 .name = "PCI",
688 .match = pci_acpi_bus_match,
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100689 .find_companion = acpi_pci_find_companion,
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100690 .setup = pci_acpi_setup,
691 .cleanup = pci_acpi_cleanup,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500692};
693
Suravee Suthikulpanit471036b2015-12-10 08:55:27 -0800694
695static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
696
697/**
698 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
699 * @fn: Callback matching a device to a fwnode that identifies a PCI
700 * MSI domain.
701 *
702 * This should be called by irqchip driver, which is the parent of
703 * the MSI domain to provide callback interface to query fwnode.
704 */
705void
706pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
707{
708 pci_msi_get_fwnode_cb = fn;
709}
710
711/**
712 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
713 * @bus: The PCI host bridge bus.
714 *
715 * This function uses the callback function registered by
716 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
717 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
718 * This returns NULL on error or when the domain is not found.
719 */
720struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
721{
722 struct fwnode_handle *fwnode;
723
724 if (!pci_msi_get_fwnode_cb)
725 return NULL;
726
727 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
728 if (!fwnode)
729 return NULL;
730
731 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
732}
733
Muthu Kumar9c273b92006-04-28 00:42:21 -0700734static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500735{
736 int ret;
737
Bob Moore993958f2009-02-03 15:14:33 +0800738 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Yijing Wange7d45152013-05-28 16:03:46 +0800739 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
Shaohua Lif8993af2007-04-25 11:05:12 +0800740 pci_no_msi();
741 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800742
Bob Moore993958f2009-02-03 15:14:33 +0800743 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Yijing Wange7d45152013-05-28 16:03:46 +0800744 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
Shaohua Li5fde2442008-07-23 10:32:24 +0800745 pcie_no_aspm();
746 }
747
Muthu Kumar9c273b92006-04-28 00:42:21 -0700748 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500749 if (ret)
750 return 0;
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000751
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200752 pci_set_platform_pm(&acpi_pci_platform_pm);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000753 acpi_pci_slot_init();
Jiang Liu3b63aaa2013-04-12 05:44:26 +0000754 acpiphp_init();
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000755
David Shaohua Li84df749f2005-03-18 18:53:36 -0500756 return 0;
757}
Muthu Kumar9c273b92006-04-28 00:42:21 -0700758arch_initcall(acpi_pci_init);