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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>
13#include <linux/module.h>
Shaohua Li5fde2442008-07-23 10:32:24 +080014#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <acpi/acpi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010019#include <linux/pm_runtime.h>
David Shaohua Li0f644742005-03-19 00:15:48 -050020#include "pci.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010022static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
23
24/**
25 * pci_acpi_wake_bus - Wake-up notification handler for root buses.
26 * @handle: ACPI handle of a device the notification is for.
27 * @event: Type of the signaled event.
28 * @context: PCI root bus to wake up devices on.
29 */
30static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
31{
32 struct pci_bus *pci_bus = context;
33
34 if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
35 pci_pme_wakeup_bus(pci_bus);
36}
37
38/**
39 * pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
40 * @handle: ACPI handle of a device the notification is for.
41 * @event: Type of the signaled event.
42 * @context: PCI device object to wake up.
43 */
44static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
45{
46 struct pci_dev *pci_dev = context;
47
Rafael J. Wysockia4249482011-11-06 22:21:46 +010048 if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev)
49 return;
50
Huang Ying448bd852012-06-23 10:23:51 +080051 if (pci_dev->current_state == PCI_D3cold) {
52 pci_wakeup_event(pci_dev);
53 pm_runtime_resume(&pci_dev->dev);
54 return;
55 }
56
Rafael J. Wysockia4249482011-11-06 22:21:46 +010057 if (!pci_dev->pm_cap || !pci_dev->pme_support
58 || pci_check_pme_status(pci_dev)) {
Rafael J. Wysocki379021d2011-10-03 23:16:33 +020059 if (pci_dev->pme_poll)
60 pci_dev->pme_poll = false;
61
Rafael J. Wysocki0f953bf2010-12-29 13:22:08 +010062 pci_wakeup_event(pci_dev);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010063 pm_runtime_resume(&pci_dev->dev);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010064 }
Rafael J. Wysockia4249482011-11-06 22:21:46 +010065
66 if (pci_dev->subordinate)
67 pci_pme_wakeup_bus(pci_dev->subordinate);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010068}
69
70/**
71 * add_pm_notifier - Register PM notifier for given ACPI device.
72 * @dev: ACPI device to add the notifier for.
73 * @context: PCI device or bus to check for PME status if an event is signaled.
74 *
75 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
76 * PM wake-up events. For example, wake-up events may be generated for bridges
77 * if one of the devices below the bridge is signaling PME, even if the bridge
78 * itself doesn't have a wake-up GPE associated with it.
79 */
80static acpi_status add_pm_notifier(struct acpi_device *dev,
81 acpi_notify_handler handler,
82 void *context)
83{
84 acpi_status status = AE_ALREADY_EXISTS;
85
86 mutex_lock(&pci_acpi_pm_notify_mtx);
87
88 if (dev->wakeup.flags.notifier_present)
89 goto out;
90
91 status = acpi_install_notify_handler(dev->handle,
92 ACPI_SYSTEM_NOTIFY,
93 handler, context);
94 if (ACPI_FAILURE(status))
95 goto out;
96
97 dev->wakeup.flags.notifier_present = true;
98
99 out:
100 mutex_unlock(&pci_acpi_pm_notify_mtx);
101 return status;
102}
103
104/**
105 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
106 * @dev: ACPI device to remove the notifier from.
107 */
108static acpi_status remove_pm_notifier(struct acpi_device *dev,
109 acpi_notify_handler handler)
110{
111 acpi_status status = AE_BAD_PARAMETER;
112
113 mutex_lock(&pci_acpi_pm_notify_mtx);
114
115 if (!dev->wakeup.flags.notifier_present)
116 goto out;
117
118 status = acpi_remove_notify_handler(dev->handle,
119 ACPI_SYSTEM_NOTIFY,
120 handler);
121 if (ACPI_FAILURE(status))
122 goto out;
123
124 dev->wakeup.flags.notifier_present = false;
125
126 out:
127 mutex_unlock(&pci_acpi_pm_notify_mtx);
128 return status;
129}
130
131/**
132 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
133 * @dev: ACPI device to add the notifier for.
134 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
135 */
136acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
137 struct pci_bus *pci_bus)
138{
139 return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
140}
141
142/**
143 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
144 * @dev: ACPI device to remove the notifier from.
145 */
146acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
147{
148 return remove_pm_notifier(dev, pci_acpi_wake_bus);
149}
150
151/**
152 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
153 * @dev: ACPI device to add the notifier for.
154 * @pci_dev: PCI device to check for the PME status if an event is signaled.
155 */
156acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
157 struct pci_dev *pci_dev)
158{
159 return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
160}
161
162/**
163 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
164 * @dev: ACPI device to remove the notifier from.
165 */
166acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
167{
168 return remove_pm_notifier(dev, pci_acpi_wake_dev);
169}
170
David Shaohua Li0f644742005-03-19 00:15:48 -0500171/*
172 * _SxD returns the D-state with the highest power
173 * (lowest D-state number) supported in the S-state "x".
174 *
175 * If the devices does not have a _PRW
176 * (Power Resources for Wake) supporting system wakeup from "x"
177 * then the OS is free to choose a lower power (higher number
178 * D-state) than the return value from _SxD.
179 *
180 * But if _PRW is enabled at S-state "x", the OS
181 * must not choose a power lower than _SxD --
182 * unless the device has an _SxW method specifying
183 * the lowest power (highest D-state number) the device
184 * may enter while still able to wake the system.
185 *
186 * ie. depending on global OS policy:
187 *
188 * if (_PRW at S-state x)
189 * choose from highest power _SxD to lowest power _SxW
190 * else // no _PRW at S-state x
191 * choose highest power _SxD or any lower power
David Shaohua Li0f644742005-03-19 00:15:48 -0500192 */
193
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200194static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500195{
Huang Ying448bd852012-06-23 10:23:51 +0800196 int acpi_state, d_max;
David Shaohua Li0f644742005-03-19 00:15:48 -0500197
Huang Ying448bd852012-06-23 10:23:51 +0800198 if (pdev->no_d3cold)
199 d_max = ACPI_STATE_D3_HOT;
200 else
201 d_max = ACPI_STATE_D3_COLD;
202 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
Shaohua Liab826ca2007-07-20 10:03:22 +0800203 if (acpi_state < 0)
204 return PCI_POWER_ERROR;
205
206 switch (acpi_state) {
207 case ACPI_STATE_D0:
208 return PCI_D0;
209 case ACPI_STATE_D1:
210 return PCI_D1;
211 case ACPI_STATE_D2:
212 return PCI_D2;
Lin Ming1cc0c992012-04-23 09:03:49 +0800213 case ACPI_STATE_D3_HOT:
Shaohua Liab826ca2007-07-20 10:03:22 +0800214 return PCI_D3hot;
Lin Ming28c21032011-05-04 22:56:43 +0800215 case ACPI_STATE_D3_COLD:
216 return PCI_D3cold;
Shaohua Liab826ca2007-07-20 10:03:22 +0800217 }
218 return PCI_POWER_ERROR;
David Shaohua Li0f644742005-03-19 00:15:48 -0500219}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200220
221static bool acpi_pci_power_manageable(struct pci_dev *dev)
222{
223 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
224
225 return handle ? acpi_bus_power_manageable(handle) : false;
226}
David Shaohua Li0f644742005-03-19 00:15:48 -0500227
David Shaohua Lib9131002005-03-19 00:16:18 -0500228static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
229{
230 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
Shaohua Li10b3dca2007-07-20 10:03:25 +0800231 acpi_handle tmp;
David Brownell583c3772008-02-22 21:41:51 -0800232 static const u8 state_conv[] = {
233 [PCI_D0] = ACPI_STATE_D0,
234 [PCI_D1] = ACPI_STATE_D1,
235 [PCI_D2] = ACPI_STATE_D2,
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +0200236 [PCI_D3hot] = ACPI_STATE_D3,
David Brownell583c3772008-02-22 21:41:51 -0800237 [PCI_D3cold] = ACPI_STATE_D3
David Shaohua Lib9131002005-03-19 00:16:18 -0500238 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200239 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500240
Shaohua Li10b3dca2007-07-20 10:03:25 +0800241 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200242 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
243 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800244
245 switch (state) {
246 case PCI_D0:
247 case PCI_D1:
248 case PCI_D2:
249 case PCI_D3hot:
250 case PCI_D3cold:
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200251 error = acpi_bus_set_power(handle, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800252 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200253
254 if (!error)
255 dev_printk(KERN_INFO, &dev->dev,
256 "power state changed by ACPI to D%d\n", state);
257
258 return error;
David Shaohua Lib9131002005-03-19 00:16:18 -0500259}
260
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200261static bool acpi_pci_can_wakeup(struct pci_dev *dev)
262{
263 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
264
265 return handle ? acpi_bus_can_wakeup(handle) : false;
266}
267
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200268static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
269{
270 while (bus->parent) {
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100271 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200272 return;
273 bus = bus->parent;
274 }
275
276 /* We have reached the root bus. */
277 if (bus->bridge)
278 acpi_pm_device_sleep_wake(bus->bridge, enable);
279}
280
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200281static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
282{
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200283 if (acpi_pci_can_wakeup(dev))
284 return acpi_pm_device_sleep_wake(&dev->dev, enable);
285
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100286 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200287 return 0;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200288}
289
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100290static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
291{
292 while (bus->parent) {
293 struct pci_dev *bridge = bus->self;
294
295 if (bridge->pme_interrupt)
296 return;
Lin Mingb24e5092012-03-27 15:43:25 +0800297 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100298 return;
299 bus = bus->parent;
300 }
301
302 /* We have reached the root bus. */
303 if (bus->bridge)
Lin Mingb24e5092012-03-27 15:43:25 +0800304 acpi_pm_device_run_wake(bus->bridge, enable);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100305}
306
307static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
308{
Huang Ying448bd852012-06-23 10:23:51 +0800309 /*
310 * Per PCI Express Base Specification Revision 2.0 section
311 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
312 * waking up to power on the main link even if there is PME
313 * support for D3cold
314 */
315 if (dev->pme_interrupt && !dev->runtime_d3cold)
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100316 return 0;
317
Lin Mingb24e5092012-03-27 15:43:25 +0800318 if (!acpi_pm_device_run_wake(&dev->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100319 return 0;
320
321 acpi_pci_propagate_run_wake(dev->bus, enable);
322 return 0;
323}
324
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200325static struct pci_platform_pm_ops acpi_pci_platform_pm = {
326 .is_manageable = acpi_pci_power_manageable,
327 .set_state = acpi_pci_set_power_state,
328 .choose_state = acpi_pci_choose_state,
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200329 .can_wakeup = acpi_pci_can_wakeup,
330 .sleep_wake = acpi_pci_sleep_wake,
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100331 .run_wake = acpi_pci_run_wake,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200332};
David Shaohua Lib9131002005-03-19 00:16:18 -0500333
David Shaohua Li84df749f2005-03-18 18:53:36 -0500334/* ACPI bus type */
Muthu Kumar9c273b92006-04-28 00:42:21 -0700335static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500336{
337 struct pci_dev * pci_dev;
Lin Ming439913f2010-01-28 10:53:19 +0800338 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500339
340 pci_dev = to_pci_dev(dev);
341 /* Please ref to ACPI spec for the syntax of _ADR */
342 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
343 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
344 if (!*handle)
345 return -ENODEV;
346 return 0;
347}
348
Muthu Kumar9c273b92006-04-28 00:42:21 -0700349static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500350{
351 int num;
352 unsigned int seg, bus;
353
354 /*
355 * The string should be the same as root bridge's name
356 * Please look at 'pci_scan_bus_parented'
357 */
Kay Sievers1a927132008-10-30 02:17:49 +0100358 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500359 if (num != 2)
360 return -ENODEV;
361 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
362 if (!*handle)
363 return -ENODEV;
364 return 0;
365}
366
Muthu Kumar9c273b92006-04-28 00:42:21 -0700367static struct acpi_bus_type acpi_pci_bus = {
David Shaohua Li84df749f2005-03-18 18:53:36 -0500368 .bus = &pci_bus_type,
Muthu Kumar9c273b92006-04-28 00:42:21 -0700369 .find_device = acpi_pci_find_device,
370 .find_bridge = acpi_pci_find_root_bridge,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500371};
372
Muthu Kumar9c273b92006-04-28 00:42:21 -0700373static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500374{
375 int ret;
376
Bob Moore993958f2009-02-03 15:14:33 +0800377 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Shaohua Lif8993af2007-04-25 11:05:12 +0800378 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
379 pci_no_msi();
380 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800381
Bob Moore993958f2009-02-03 15:14:33 +0800382 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Shaohua Li5fde2442008-07-23 10:32:24 +0800383 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
384 pcie_no_aspm();
385 }
386
Muthu Kumar9c273b92006-04-28 00:42:21 -0700387 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500388 if (ret)
389 return 0;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200390 pci_set_platform_pm(&acpi_pci_platform_pm);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500391 return 0;
392}
Muthu Kumar9c273b92006-04-28 00:42:21 -0700393arch_initcall(acpi_pci_init);