Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File: pci-acpi.c | |
a406d9e6 | 3 | * Purpose: Provide PCI support in ACPI |
1da177e4 | 4 | * |
84df749f DSL |
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. | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/delay.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/pci.h> | |
13 | #include <linux/module.h> | |
5fde244d | 14 | #include <linux/pci-aspm.h> |
1da177e4 | 15 | #include <acpi/acpi.h> |
1da177e4 LT |
16 | #include <acpi/acpi_bus.h> |
17 | ||
18 | #include <linux/pci-acpi.h> | |
b67ea761 | 19 | #include <linux/pm_runtime.h> |
8b713a88 | 20 | #include <linux/pm_qos.h> |
0f64474b | 21 | #include "pci.h" |
1da177e4 | 22 | |
b67ea761 RW |
23 | static DEFINE_MUTEX(pci_acpi_pm_notify_mtx); |
24 | ||
25 | /** | |
26 | * pci_acpi_wake_bus - Wake-up notification handler for root buses. | |
27 | * @handle: ACPI handle of a device the notification is for. | |
28 | * @event: Type of the signaled event. | |
29 | * @context: PCI root bus to wake up devices on. | |
30 | */ | |
31 | static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context) | |
32 | { | |
33 | struct pci_bus *pci_bus = context; | |
34 | ||
35 | if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus) | |
36 | pci_pme_wakeup_bus(pci_bus); | |
37 | } | |
38 | ||
39 | /** | |
40 | * pci_acpi_wake_dev - Wake-up notification handler for PCI devices. | |
41 | * @handle: ACPI handle of a device the notification is for. | |
42 | * @event: Type of the signaled event. | |
43 | * @context: PCI device object to wake up. | |
44 | */ | |
45 | static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) | |
46 | { | |
47 | struct pci_dev *pci_dev = context; | |
48 | ||
a424948d RW |
49 | if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) |
50 | return; | |
51 | ||
448bd857 HY |
52 | if (pci_dev->current_state == PCI_D3cold) { |
53 | pci_wakeup_event(pci_dev); | |
54 | pm_runtime_resume(&pci_dev->dev); | |
55 | return; | |
56 | } | |
57 | ||
a424948d RW |
58 | if (!pci_dev->pm_cap || !pci_dev->pme_support |
59 | || pci_check_pme_status(pci_dev)) { | |
379021d5 RW |
60 | if (pci_dev->pme_poll) |
61 | pci_dev->pme_poll = false; | |
62 | ||
0f953bf6 | 63 | pci_wakeup_event(pci_dev); |
b67ea761 | 64 | pm_runtime_resume(&pci_dev->dev); |
b67ea761 | 65 | } |
a424948d RW |
66 | |
67 | if (pci_dev->subordinate) | |
68 | pci_pme_wakeup_bus(pci_dev->subordinate); | |
b67ea761 RW |
69 | } |
70 | ||
71 | /** | |
72 | * add_pm_notifier - Register PM notifier for given ACPI device. | |
73 | * @dev: ACPI device to add the notifier for. | |
74 | * @context: PCI device or bus to check for PME status if an event is signaled. | |
75 | * | |
76 | * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of | |
77 | * PM wake-up events. For example, wake-up events may be generated for bridges | |
78 | * if one of the devices below the bridge is signaling PME, even if the bridge | |
79 | * itself doesn't have a wake-up GPE associated with it. | |
80 | */ | |
81 | static acpi_status add_pm_notifier(struct acpi_device *dev, | |
82 | acpi_notify_handler handler, | |
83 | void *context) | |
84 | { | |
85 | acpi_status status = AE_ALREADY_EXISTS; | |
86 | ||
87 | mutex_lock(&pci_acpi_pm_notify_mtx); | |
88 | ||
89 | if (dev->wakeup.flags.notifier_present) | |
90 | goto out; | |
91 | ||
92 | status = acpi_install_notify_handler(dev->handle, | |
93 | ACPI_SYSTEM_NOTIFY, | |
94 | handler, context); | |
95 | if (ACPI_FAILURE(status)) | |
96 | goto out; | |
97 | ||
98 | dev->wakeup.flags.notifier_present = true; | |
99 | ||
100 | out: | |
101 | mutex_unlock(&pci_acpi_pm_notify_mtx); | |
102 | return status; | |
103 | } | |
104 | ||
105 | /** | |
106 | * remove_pm_notifier - Unregister PM notifier from given ACPI device. | |
107 | * @dev: ACPI device to remove the notifier from. | |
108 | */ | |
109 | static acpi_status remove_pm_notifier(struct acpi_device *dev, | |
110 | acpi_notify_handler handler) | |
111 | { | |
112 | acpi_status status = AE_BAD_PARAMETER; | |
113 | ||
114 | mutex_lock(&pci_acpi_pm_notify_mtx); | |
115 | ||
116 | if (!dev->wakeup.flags.notifier_present) | |
117 | goto out; | |
118 | ||
119 | status = acpi_remove_notify_handler(dev->handle, | |
120 | ACPI_SYSTEM_NOTIFY, | |
121 | handler); | |
122 | if (ACPI_FAILURE(status)) | |
123 | goto out; | |
124 | ||
125 | dev->wakeup.flags.notifier_present = false; | |
126 | ||
127 | out: | |
128 | mutex_unlock(&pci_acpi_pm_notify_mtx); | |
129 | return status; | |
130 | } | |
131 | ||
132 | /** | |
133 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. | |
134 | * @dev: ACPI device to add the notifier for. | |
135 | * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. | |
136 | */ | |
137 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, | |
138 | struct pci_bus *pci_bus) | |
139 | { | |
140 | return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); | |
141 | } | |
142 | ||
143 | /** | |
144 | * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. | |
145 | * @dev: ACPI device to remove the notifier from. | |
146 | */ | |
147 | acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) | |
148 | { | |
149 | return remove_pm_notifier(dev, pci_acpi_wake_bus); | |
150 | } | |
151 | ||
152 | /** | |
153 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
154 | * @dev: ACPI device to add the notifier for. | |
155 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
156 | */ | |
157 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
158 | struct pci_dev *pci_dev) | |
159 | { | |
160 | return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); | |
161 | } | |
162 | ||
163 | /** | |
164 | * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. | |
165 | * @dev: ACPI device to remove the notifier from. | |
166 | */ | |
167 | acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) | |
168 | { | |
169 | return remove_pm_notifier(dev, pci_acpi_wake_dev); | |
170 | } | |
171 | ||
f4b57a3b JL |
172 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
173 | { | |
174 | acpi_status status = AE_NOT_EXIST; | |
175 | unsigned long long mcfg_addr; | |
176 | ||
177 | if (handle) | |
178 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
179 | NULL, &mcfg_addr); | |
180 | if (ACPI_FAILURE(status)) | |
181 | return 0; | |
182 | ||
183 | return (phys_addr_t)mcfg_addr; | |
184 | } | |
185 | ||
0f64474b DSL |
186 | /* |
187 | * _SxD returns the D-state with the highest power | |
188 | * (lowest D-state number) supported in the S-state "x". | |
189 | * | |
190 | * If the devices does not have a _PRW | |
191 | * (Power Resources for Wake) supporting system wakeup from "x" | |
192 | * then the OS is free to choose a lower power (higher number | |
193 | * D-state) than the return value from _SxD. | |
194 | * | |
195 | * But if _PRW is enabled at S-state "x", the OS | |
196 | * must not choose a power lower than _SxD -- | |
197 | * unless the device has an _SxW method specifying | |
198 | * the lowest power (highest D-state number) the device | |
199 | * may enter while still able to wake the system. | |
200 | * | |
201 | * ie. depending on global OS policy: | |
202 | * | |
203 | * if (_PRW at S-state x) | |
204 | * choose from highest power _SxD to lowest power _SxW | |
205 | * else // no _PRW at S-state x | |
206 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
207 | */ |
208 | ||
8d2bdf49 | 209 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 210 | { |
448bd857 | 211 | int acpi_state, d_max; |
0f64474b | 212 | |
448bd857 HY |
213 | if (pdev->no_d3cold) |
214 | d_max = ACPI_STATE_D3_HOT; | |
215 | else | |
216 | d_max = ACPI_STATE_D3_COLD; | |
217 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
218 | if (acpi_state < 0) |
219 | return PCI_POWER_ERROR; | |
220 | ||
221 | switch (acpi_state) { | |
222 | case ACPI_STATE_D0: | |
223 | return PCI_D0; | |
224 | case ACPI_STATE_D1: | |
225 | return PCI_D1; | |
226 | case ACPI_STATE_D2: | |
227 | return PCI_D2; | |
1cc0c998 | 228 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 229 | return PCI_D3hot; |
28c2103d LM |
230 | case ACPI_STATE_D3_COLD: |
231 | return PCI_D3cold; | |
ab826ca4 SL |
232 | } |
233 | return PCI_POWER_ERROR; | |
0f64474b | 234 | } |
961d9120 RW |
235 | |
236 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
237 | { | |
238 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
239 | ||
240 | return handle ? acpi_bus_power_manageable(handle) : false; | |
241 | } | |
0f64474b | 242 | |
b913100d DSL |
243 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
244 | { | |
245 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 246 | acpi_handle tmp; |
583c377f DB |
247 | static const u8 state_conv[] = { |
248 | [PCI_D0] = ACPI_STATE_D0, | |
249 | [PCI_D1] = ACPI_STATE_D1, | |
250 | [PCI_D2] = ACPI_STATE_D2, | |
5c7dd710 | 251 | [PCI_D3hot] = ACPI_STATE_D3, |
583c377f | 252 | [PCI_D3cold] = ACPI_STATE_D3 |
b913100d | 253 | }; |
44e4e66e | 254 | int error = -EINVAL; |
b913100d | 255 | |
10b3dcae | 256 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
257 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
258 | return -ENODEV; | |
583c377f DB |
259 | |
260 | switch (state) { | |
8b713a88 RW |
261 | case PCI_D3cold: |
262 | if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == | |
263 | PM_QOS_FLAGS_ALL) { | |
264 | error = -EBUSY; | |
265 | break; | |
266 | } | |
583c377f DB |
267 | case PCI_D0: |
268 | case PCI_D1: | |
269 | case PCI_D2: | |
270 | case PCI_D3hot: | |
44e4e66e | 271 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 272 | } |
44e4e66e RW |
273 | |
274 | if (!error) | |
3d0882c0 RW |
275 | dev_info(&dev->dev, "power state changed by ACPI to %s\n", |
276 | pci_power_name(state)); | |
44e4e66e RW |
277 | |
278 | return error; | |
b913100d DSL |
279 | } |
280 | ||
eb9d0fe4 RW |
281 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
282 | { | |
283 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
284 | ||
285 | return handle ? acpi_bus_can_wakeup(handle) : false; | |
286 | } | |
287 | ||
0baed8da RW |
288 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
289 | { | |
290 | while (bus->parent) { | |
dc1a94ae | 291 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
292 | return; |
293 | bus = bus->parent; | |
294 | } | |
295 | ||
296 | /* We have reached the root bus. */ | |
297 | if (bus->bridge) | |
298 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
299 | } | |
300 | ||
eb9d0fe4 RW |
301 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
302 | { | |
0baed8da RW |
303 | if (acpi_pci_can_wakeup(dev)) |
304 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
305 | ||
dc1a94ae | 306 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 307 | return 0; |
eb9d0fe4 RW |
308 | } |
309 | ||
b67ea761 RW |
310 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
311 | { | |
312 | while (bus->parent) { | |
313 | struct pci_dev *bridge = bus->self; | |
314 | ||
315 | if (bridge->pme_interrupt) | |
316 | return; | |
b24e5098 | 317 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
318 | return; |
319 | bus = bus->parent; | |
320 | } | |
321 | ||
322 | /* We have reached the root bus. */ | |
323 | if (bus->bridge) | |
b24e5098 | 324 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
325 | } |
326 | ||
327 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
328 | { | |
448bd857 HY |
329 | /* |
330 | * Per PCI Express Base Specification Revision 2.0 section | |
331 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
332 | * waking up to power on the main link even if there is PME | |
333 | * support for D3cold | |
334 | */ | |
335 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
336 | return 0; |
337 | ||
b24e5098 | 338 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
339 | return 0; |
340 | ||
341 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
342 | return 0; | |
343 | } | |
344 | ||
961d9120 RW |
345 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
346 | .is_manageable = acpi_pci_power_manageable, | |
347 | .set_state = acpi_pci_set_power_state, | |
348 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 RW |
349 | .can_wakeup = acpi_pci_can_wakeup, |
350 | .sleep_wake = acpi_pci_sleep_wake, | |
b67ea761 | 351 | .run_wake = acpi_pci_run_wake, |
961d9120 | 352 | }; |
b913100d | 353 | |
84df749f | 354 | /* ACPI bus type */ |
9c273b95 | 355 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
356 | { |
357 | struct pci_dev * pci_dev; | |
439913ff | 358 | u64 addr; |
84df749f DSL |
359 | |
360 | pci_dev = to_pci_dev(dev); | |
361 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
362 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
363 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
364 | if (!*handle) | |
365 | return -ENODEV; | |
366 | return 0; | |
367 | } | |
368 | ||
9c273b95 | 369 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
370 | { |
371 | int num; | |
372 | unsigned int seg, bus; | |
373 | ||
374 | /* | |
375 | * The string should be the same as root bridge's name | |
376 | * Please look at 'pci_scan_bus_parented' | |
377 | */ | |
1a927133 | 378 | num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus); |
84df749f DSL |
379 | if (num != 2) |
380 | return -ENODEV; | |
381 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
382 | if (!*handle) | |
383 | return -ENODEV; | |
384 | return 0; | |
385 | } | |
386 | ||
9c273b95 | 387 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 388 | .bus = &pci_bus_type, |
9c273b95 MK |
389 | .find_device = acpi_pci_find_device, |
390 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
391 | }; |
392 | ||
9c273b95 | 393 | static int __init acpi_pci_init(void) |
84df749f DSL |
394 | { |
395 | int ret; | |
396 | ||
993958fe | 397 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
f8993aff SL |
398 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
399 | pci_no_msi(); | |
400 | } | |
5fde244d | 401 | |
993958fe | 402 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
5fde244d SL |
403 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
404 | pcie_no_aspm(); | |
405 | } | |
406 | ||
9c273b95 | 407 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
408 | if (ret) |
409 | return 0; | |
961d9120 | 410 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
411 | return 0; |
412 | } | |
9c273b95 | 413 | arch_initcall(acpi_pci_init); |