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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
51 if (!pci_dev->pm_cap || !pci_dev->pme_support
52 || pci_check_pme_status(pci_dev)) {
Rafael J. Wysocki379021d2011-10-03 23:16:33 +020053 if (pci_dev->pme_poll)
54 pci_dev->pme_poll = false;
55
Rafael J. Wysocki0f953bf2010-12-29 13:22:08 +010056 pci_wakeup_event(pci_dev);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010057 pm_runtime_resume(&pci_dev->dev);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010058 }
Rafael J. Wysockia4249482011-11-06 22:21:46 +010059
60 if (pci_dev->subordinate)
61 pci_pme_wakeup_bus(pci_dev->subordinate);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +010062}
63
64/**
65 * add_pm_notifier - Register PM notifier for given ACPI device.
66 * @dev: ACPI device to add the notifier for.
67 * @context: PCI device or bus to check for PME status if an event is signaled.
68 *
69 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
70 * PM wake-up events. For example, wake-up events may be generated for bridges
71 * if one of the devices below the bridge is signaling PME, even if the bridge
72 * itself doesn't have a wake-up GPE associated with it.
73 */
74static acpi_status add_pm_notifier(struct acpi_device *dev,
75 acpi_notify_handler handler,
76 void *context)
77{
78 acpi_status status = AE_ALREADY_EXISTS;
79
80 mutex_lock(&pci_acpi_pm_notify_mtx);
81
82 if (dev->wakeup.flags.notifier_present)
83 goto out;
84
85 status = acpi_install_notify_handler(dev->handle,
86 ACPI_SYSTEM_NOTIFY,
87 handler, context);
88 if (ACPI_FAILURE(status))
89 goto out;
90
91 dev->wakeup.flags.notifier_present = true;
92
93 out:
94 mutex_unlock(&pci_acpi_pm_notify_mtx);
95 return status;
96}
97
98/**
99 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
100 * @dev: ACPI device to remove the notifier from.
101 */
102static acpi_status remove_pm_notifier(struct acpi_device *dev,
103 acpi_notify_handler handler)
104{
105 acpi_status status = AE_BAD_PARAMETER;
106
107 mutex_lock(&pci_acpi_pm_notify_mtx);
108
109 if (!dev->wakeup.flags.notifier_present)
110 goto out;
111
112 status = acpi_remove_notify_handler(dev->handle,
113 ACPI_SYSTEM_NOTIFY,
114 handler);
115 if (ACPI_FAILURE(status))
116 goto out;
117
118 dev->wakeup.flags.notifier_present = false;
119
120 out:
121 mutex_unlock(&pci_acpi_pm_notify_mtx);
122 return status;
123}
124
125/**
126 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
127 * @dev: ACPI device to add the notifier for.
128 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
129 */
130acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
131 struct pci_bus *pci_bus)
132{
133 return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
134}
135
136/**
137 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
138 * @dev: ACPI device to remove the notifier from.
139 */
140acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
141{
142 return remove_pm_notifier(dev, pci_acpi_wake_bus);
143}
144
145/**
146 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
147 * @dev: ACPI device to add the notifier for.
148 * @pci_dev: PCI device to check for the PME status if an event is signaled.
149 */
150acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
151 struct pci_dev *pci_dev)
152{
153 return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
154}
155
156/**
157 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
158 * @dev: ACPI device to remove the notifier from.
159 */
160acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
161{
162 return remove_pm_notifier(dev, pci_acpi_wake_dev);
163}
164
David Shaohua Li0f644742005-03-19 00:15:48 -0500165/*
166 * _SxD returns the D-state with the highest power
167 * (lowest D-state number) supported in the S-state "x".
168 *
169 * If the devices does not have a _PRW
170 * (Power Resources for Wake) supporting system wakeup from "x"
171 * then the OS is free to choose a lower power (higher number
172 * D-state) than the return value from _SxD.
173 *
174 * But if _PRW is enabled at S-state "x", the OS
175 * must not choose a power lower than _SxD --
176 * unless the device has an _SxW method specifying
177 * the lowest power (highest D-state number) the device
178 * may enter while still able to wake the system.
179 *
180 * ie. depending on global OS policy:
181 *
182 * if (_PRW at S-state x)
183 * choose from highest power _SxD to lowest power _SxW
184 * else // no _PRW at S-state x
185 * choose highest power _SxD or any lower power
David Shaohua Li0f644742005-03-19 00:15:48 -0500186 */
187
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200188static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500189{
Shaohua Liab826ca2007-07-20 10:03:22 +0800190 int acpi_state;
David Shaohua Li0f644742005-03-19 00:15:48 -0500191
David Brownell06166782008-06-05 01:15:40 +0200192 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
Shaohua Liab826ca2007-07-20 10:03:22 +0800193 if (acpi_state < 0)
194 return PCI_POWER_ERROR;
195
196 switch (acpi_state) {
197 case ACPI_STATE_D0:
198 return PCI_D0;
199 case ACPI_STATE_D1:
200 return PCI_D1;
201 case ACPI_STATE_D2:
202 return PCI_D2;
Lin Ming1cc0c992012-04-23 09:03:49 +0800203 case ACPI_STATE_D3_HOT:
Shaohua Liab826ca2007-07-20 10:03:22 +0800204 return PCI_D3hot;
Lin Ming28c21032011-05-04 22:56:43 +0800205 case ACPI_STATE_D3_COLD:
206 return PCI_D3cold;
Shaohua Liab826ca2007-07-20 10:03:22 +0800207 }
208 return PCI_POWER_ERROR;
David Shaohua Li0f644742005-03-19 00:15:48 -0500209}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200210
211static bool acpi_pci_power_manageable(struct pci_dev *dev)
212{
213 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
214
215 return handle ? acpi_bus_power_manageable(handle) : false;
216}
David Shaohua Li0f644742005-03-19 00:15:48 -0500217
David Shaohua Lib9131002005-03-19 00:16:18 -0500218static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
219{
220 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
Shaohua Li10b3dca2007-07-20 10:03:25 +0800221 acpi_handle tmp;
David Brownell583c3772008-02-22 21:41:51 -0800222 static const u8 state_conv[] = {
223 [PCI_D0] = ACPI_STATE_D0,
224 [PCI_D1] = ACPI_STATE_D1,
225 [PCI_D2] = ACPI_STATE_D2,
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +0200226 [PCI_D3hot] = ACPI_STATE_D3,
David Brownell583c3772008-02-22 21:41:51 -0800227 [PCI_D3cold] = ACPI_STATE_D3
David Shaohua Lib9131002005-03-19 00:16:18 -0500228 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200229 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500230
Shaohua Li10b3dca2007-07-20 10:03:25 +0800231 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200232 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
233 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800234
235 switch (state) {
236 case PCI_D0:
237 case PCI_D1:
238 case PCI_D2:
239 case PCI_D3hot:
240 case PCI_D3cold:
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200241 error = acpi_bus_set_power(handle, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800242 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200243
244 if (!error)
245 dev_printk(KERN_INFO, &dev->dev,
246 "power state changed by ACPI to D%d\n", state);
247
248 return error;
David Shaohua Lib9131002005-03-19 00:16:18 -0500249}
250
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200251static bool acpi_pci_can_wakeup(struct pci_dev *dev)
252{
253 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
254
255 return handle ? acpi_bus_can_wakeup(handle) : false;
256}
257
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200258static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
259{
260 while (bus->parent) {
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100261 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200262 return;
263 bus = bus->parent;
264 }
265
266 /* We have reached the root bus. */
267 if (bus->bridge)
268 acpi_pm_device_sleep_wake(bus->bridge, enable);
269}
270
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200271static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
272{
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200273 if (acpi_pci_can_wakeup(dev))
274 return acpi_pm_device_sleep_wake(&dev->dev, enable);
275
Rafael J. Wysockidc1a94a2009-11-29 16:35:54 +0100276 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200277 return 0;
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200278}
279
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100280static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
281{
282 while (bus->parent) {
283 struct pci_dev *bridge = bus->self;
284
285 if (bridge->pme_interrupt)
286 return;
Lin Mingb24e5092012-03-27 15:43:25 +0800287 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100288 return;
289 bus = bus->parent;
290 }
291
292 /* We have reached the root bus. */
293 if (bus->bridge)
Lin Mingb24e5092012-03-27 15:43:25 +0800294 acpi_pm_device_run_wake(bus->bridge, enable);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100295}
296
297static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
298{
299 if (dev->pme_interrupt)
300 return 0;
301
Lin Mingb24e5092012-03-27 15:43:25 +0800302 if (!acpi_pm_device_run_wake(&dev->dev, enable))
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100303 return 0;
304
305 acpi_pci_propagate_run_wake(dev->bus, enable);
306 return 0;
307}
308
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200309static struct pci_platform_pm_ops acpi_pci_platform_pm = {
310 .is_manageable = acpi_pci_power_manageable,
311 .set_state = acpi_pci_set_power_state,
312 .choose_state = acpi_pci_choose_state,
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200313 .can_wakeup = acpi_pci_can_wakeup,
314 .sleep_wake = acpi_pci_sleep_wake,
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100315 .run_wake = acpi_pci_run_wake,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200316};
David Shaohua Lib9131002005-03-19 00:16:18 -0500317
David Shaohua Li84df749f2005-03-18 18:53:36 -0500318/* ACPI bus type */
Muthu Kumar9c273b92006-04-28 00:42:21 -0700319static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500320{
321 struct pci_dev * pci_dev;
Lin Ming439913f2010-01-28 10:53:19 +0800322 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500323
324 pci_dev = to_pci_dev(dev);
325 /* Please ref to ACPI spec for the syntax of _ADR */
326 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
327 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
328 if (!*handle)
329 return -ENODEV;
330 return 0;
331}
332
Muthu Kumar9c273b92006-04-28 00:42:21 -0700333static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500334{
335 int num;
336 unsigned int seg, bus;
337
338 /*
339 * The string should be the same as root bridge's name
340 * Please look at 'pci_scan_bus_parented'
341 */
Kay Sievers1a927132008-10-30 02:17:49 +0100342 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500343 if (num != 2)
344 return -ENODEV;
345 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
346 if (!*handle)
347 return -ENODEV;
348 return 0;
349}
350
Muthu Kumar9c273b92006-04-28 00:42:21 -0700351static struct acpi_bus_type acpi_pci_bus = {
David Shaohua Li84df749f2005-03-18 18:53:36 -0500352 .bus = &pci_bus_type,
Muthu Kumar9c273b92006-04-28 00:42:21 -0700353 .find_device = acpi_pci_find_device,
354 .find_bridge = acpi_pci_find_root_bridge,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500355};
356
Muthu Kumar9c273b92006-04-28 00:42:21 -0700357static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500358{
359 int ret;
360
Bob Moore993958f2009-02-03 15:14:33 +0800361 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Shaohua Lif8993af2007-04-25 11:05:12 +0800362 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
363 pci_no_msi();
364 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800365
Bob Moore993958f2009-02-03 15:14:33 +0800366 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Shaohua Li5fde2442008-07-23 10:32:24 +0800367 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
368 pcie_no_aspm();
369 }
370
Muthu Kumar9c273b92006-04-28 00:42:21 -0700371 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500372 if (ret)
373 return 0;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200374 pci_set_platform_pm(&acpi_pci_platform_pm);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500375 return 0;
376}
Muthu Kumar9c273b92006-04-28 00:42:21 -0700377arch_initcall(acpi_pci_init);