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> | |
471036b2 | 12 | #include <linux/irqdomain.h> |
1da177e4 | 13 | #include <linux/pci.h> |
471036b2 | 14 | #include <linux/msi.h> |
9ce90ea5 | 15 | #include <linux/pci_hotplug.h> |
1da177e4 | 16 | #include <linux/module.h> |
5fde244d | 17 | #include <linux/pci-aspm.h> |
1da177e4 | 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 | |
18e94a33 AL |
23 | /* |
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 | */ | |
27 | const 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 | ||
169de969 DL |
32 | #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64) |
33 | static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res) | |
34 | { | |
35 | struct device *dev = &adev->dev; | |
36 | struct resource_entry *entry; | |
37 | struct list_head list; | |
38 | unsigned long flags; | |
39 | int ret; | |
40 | ||
41 | INIT_LIST_HEAD(&list); | |
42 | flags = IORESOURCE_MEM; | |
43 | ret = acpi_dev_get_resources(adev, &list, | |
44 | acpi_dev_filter_resource_type_cb, | |
45 | (void *) flags); | |
46 | if (ret < 0) { | |
47 | dev_err(dev, "failed to parse _CRS method, error code %d\n", | |
48 | ret); | |
49 | return ret; | |
50 | } | |
51 | ||
52 | if (ret == 0) { | |
53 | dev_err(dev, "no IO and memory resources present in _CRS\n"); | |
54 | return -EINVAL; | |
55 | } | |
56 | ||
57 | entry = list_first_entry(&list, struct resource_entry, node); | |
58 | *res = *entry->res; | |
59 | acpi_dev_free_resource_list(&list); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context, | |
64 | void **retval) | |
65 | { | |
66 | u16 *segment = context; | |
67 | unsigned long long uid; | |
68 | acpi_status status; | |
69 | ||
70 | status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); | |
71 | if (ACPI_FAILURE(status) || uid != *segment) | |
72 | return AE_CTRL_DEPTH; | |
73 | ||
74 | *(acpi_handle *)retval = handle; | |
75 | return AE_CTRL_TERMINATE; | |
76 | } | |
77 | ||
78 | int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment, | |
79 | struct resource *res) | |
80 | { | |
81 | struct acpi_device *adev; | |
82 | acpi_status status; | |
83 | acpi_handle handle; | |
84 | int ret; | |
85 | ||
86 | status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle); | |
87 | if (ACPI_FAILURE(status)) { | |
88 | dev_err(dev, "can't find _HID %s device to locate resources\n", | |
89 | hid); | |
90 | return -ENODEV; | |
91 | } | |
92 | ||
93 | ret = acpi_bus_get_device(handle, &adev); | |
94 | if (ret) | |
95 | return ret; | |
96 | ||
97 | ret = acpi_get_rc_addr(adev, res); | |
98 | if (ret) { | |
99 | dev_err(dev, "can't get resource from %s\n", | |
100 | dev_name(&adev->dev)); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | #endif | |
107 | ||
f4b57a3b JL |
108 | phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) |
109 | { | |
110 | acpi_status status = AE_NOT_EXIST; | |
111 | unsigned long long mcfg_addr; | |
112 | ||
113 | if (handle) | |
114 | status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, | |
115 | NULL, &mcfg_addr); | |
116 | if (ACPI_FAILURE(status)) | |
117 | return 0; | |
118 | ||
119 | return (phys_addr_t)mcfg_addr; | |
120 | } | |
121 | ||
abbfec34 BH |
122 | static acpi_status decode_type0_hpx_record(union acpi_object *record, |
123 | struct hotplug_params *hpx) | |
9ce90ea5 BH |
124 | { |
125 | int i; | |
126 | union acpi_object *fields = record->package.elements; | |
127 | u32 revision = fields[1].integer.value; | |
128 | ||
129 | switch (revision) { | |
130 | case 1: | |
131 | if (record->package.count != 6) | |
132 | return AE_ERROR; | |
133 | for (i = 2; i < 6; i++) | |
134 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
135 | return AE_ERROR; | |
136 | hpx->t0 = &hpx->type0_data; | |
137 | hpx->t0->revision = revision; | |
138 | hpx->t0->cache_line_size = fields[2].integer.value; | |
139 | hpx->t0->latency_timer = fields[3].integer.value; | |
140 | hpx->t0->enable_serr = fields[4].integer.value; | |
141 | hpx->t0->enable_perr = fields[5].integer.value; | |
142 | break; | |
143 | default: | |
144 | printk(KERN_WARNING | |
145 | "%s: Type 0 Revision %d record not supported\n", | |
146 | __func__, revision); | |
147 | return AE_ERROR; | |
148 | } | |
149 | return AE_OK; | |
150 | } | |
151 | ||
abbfec34 BH |
152 | static acpi_status decode_type1_hpx_record(union acpi_object *record, |
153 | struct hotplug_params *hpx) | |
9ce90ea5 BH |
154 | { |
155 | int i; | |
156 | union acpi_object *fields = record->package.elements; | |
157 | u32 revision = fields[1].integer.value; | |
158 | ||
159 | switch (revision) { | |
160 | case 1: | |
161 | if (record->package.count != 5) | |
162 | return AE_ERROR; | |
163 | for (i = 2; i < 5; i++) | |
164 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
165 | return AE_ERROR; | |
166 | hpx->t1 = &hpx->type1_data; | |
167 | hpx->t1->revision = revision; | |
168 | hpx->t1->max_mem_read = fields[2].integer.value; | |
169 | hpx->t1->avg_max_split = fields[3].integer.value; | |
170 | hpx->t1->tot_max_split = fields[4].integer.value; | |
171 | break; | |
172 | default: | |
173 | printk(KERN_WARNING | |
174 | "%s: Type 1 Revision %d record not supported\n", | |
175 | __func__, revision); | |
176 | return AE_ERROR; | |
177 | } | |
178 | return AE_OK; | |
179 | } | |
180 | ||
abbfec34 BH |
181 | static acpi_status decode_type2_hpx_record(union acpi_object *record, |
182 | struct hotplug_params *hpx) | |
9ce90ea5 BH |
183 | { |
184 | int i; | |
185 | union acpi_object *fields = record->package.elements; | |
186 | u32 revision = fields[1].integer.value; | |
187 | ||
188 | switch (revision) { | |
189 | case 1: | |
190 | if (record->package.count != 18) | |
191 | return AE_ERROR; | |
192 | for (i = 2; i < 18; i++) | |
193 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
194 | return AE_ERROR; | |
195 | hpx->t2 = &hpx->type2_data; | |
196 | hpx->t2->revision = revision; | |
197 | hpx->t2->unc_err_mask_and = fields[2].integer.value; | |
198 | hpx->t2->unc_err_mask_or = fields[3].integer.value; | |
199 | hpx->t2->unc_err_sever_and = fields[4].integer.value; | |
200 | hpx->t2->unc_err_sever_or = fields[5].integer.value; | |
201 | hpx->t2->cor_err_mask_and = fields[6].integer.value; | |
202 | hpx->t2->cor_err_mask_or = fields[7].integer.value; | |
203 | hpx->t2->adv_err_cap_and = fields[8].integer.value; | |
204 | hpx->t2->adv_err_cap_or = fields[9].integer.value; | |
205 | hpx->t2->pci_exp_devctl_and = fields[10].integer.value; | |
206 | hpx->t2->pci_exp_devctl_or = fields[11].integer.value; | |
207 | hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value; | |
208 | hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value; | |
209 | hpx->t2->sec_unc_err_sever_and = fields[14].integer.value; | |
210 | hpx->t2->sec_unc_err_sever_or = fields[15].integer.value; | |
211 | hpx->t2->sec_unc_err_mask_and = fields[16].integer.value; | |
212 | hpx->t2->sec_unc_err_mask_or = fields[17].integer.value; | |
213 | break; | |
214 | default: | |
215 | printk(KERN_WARNING | |
216 | "%s: Type 2 Revision %d record not supported\n", | |
217 | __func__, revision); | |
218 | return AE_ERROR; | |
219 | } | |
220 | return AE_OK; | |
221 | } | |
222 | ||
abbfec34 | 223 | static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx) |
9ce90ea5 BH |
224 | { |
225 | acpi_status status; | |
226 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
227 | union acpi_object *package, *record, *fields; | |
228 | u32 type; | |
229 | int i; | |
230 | ||
231 | /* Clear the return buffer with zeros */ | |
232 | memset(hpx, 0, sizeof(struct hotplug_params)); | |
233 | ||
234 | status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer); | |
235 | if (ACPI_FAILURE(status)) | |
236 | return status; | |
237 | ||
238 | package = (union acpi_object *)buffer.pointer; | |
239 | if (package->type != ACPI_TYPE_PACKAGE) { | |
240 | status = AE_ERROR; | |
241 | goto exit; | |
242 | } | |
243 | ||
244 | for (i = 0; i < package->package.count; i++) { | |
245 | record = &package->package.elements[i]; | |
246 | if (record->type != ACPI_TYPE_PACKAGE) { | |
247 | status = AE_ERROR; | |
248 | goto exit; | |
249 | } | |
250 | ||
251 | fields = record->package.elements; | |
252 | if (fields[0].type != ACPI_TYPE_INTEGER || | |
253 | fields[1].type != ACPI_TYPE_INTEGER) { | |
254 | status = AE_ERROR; | |
255 | goto exit; | |
256 | } | |
257 | ||
258 | type = fields[0].integer.value; | |
259 | switch (type) { | |
260 | case 0: | |
261 | status = decode_type0_hpx_record(record, hpx); | |
262 | if (ACPI_FAILURE(status)) | |
263 | goto exit; | |
264 | break; | |
265 | case 1: | |
266 | status = decode_type1_hpx_record(record, hpx); | |
267 | if (ACPI_FAILURE(status)) | |
268 | goto exit; | |
269 | break; | |
270 | case 2: | |
271 | status = decode_type2_hpx_record(record, hpx); | |
272 | if (ACPI_FAILURE(status)) | |
273 | goto exit; | |
274 | break; | |
275 | default: | |
276 | printk(KERN_ERR "%s: Type %d record not supported\n", | |
277 | __func__, type); | |
278 | status = AE_ERROR; | |
279 | goto exit; | |
280 | } | |
281 | } | |
282 | exit: | |
283 | kfree(buffer.pointer); | |
284 | return status; | |
285 | } | |
286 | ||
abbfec34 | 287 | static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) |
9ce90ea5 BH |
288 | { |
289 | acpi_status status; | |
290 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
291 | union acpi_object *package, *fields; | |
292 | int i; | |
293 | ||
294 | memset(hpp, 0, sizeof(struct hotplug_params)); | |
295 | ||
296 | status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer); | |
297 | if (ACPI_FAILURE(status)) | |
298 | return status; | |
299 | ||
300 | package = (union acpi_object *) buffer.pointer; | |
301 | if (package->type != ACPI_TYPE_PACKAGE || | |
302 | package->package.count != 4) { | |
303 | status = AE_ERROR; | |
304 | goto exit; | |
305 | } | |
306 | ||
307 | fields = package->package.elements; | |
308 | for (i = 0; i < 4; i++) { | |
309 | if (fields[i].type != ACPI_TYPE_INTEGER) { | |
310 | status = AE_ERROR; | |
311 | goto exit; | |
312 | } | |
313 | } | |
314 | ||
315 | hpp->t0 = &hpp->type0_data; | |
316 | hpp->t0->revision = 1; | |
317 | hpp->t0->cache_line_size = fields[0].integer.value; | |
318 | hpp->t0->latency_timer = fields[1].integer.value; | |
319 | hpp->t0->enable_serr = fields[2].integer.value; | |
320 | hpp->t0->enable_perr = fields[3].integer.value; | |
321 | ||
322 | exit: | |
323 | kfree(buffer.pointer); | |
324 | return status; | |
325 | } | |
326 | ||
327 | /* pci_get_hp_params | |
328 | * | |
329 | * @dev - the pci_dev for which we want parameters | |
330 | * @hpp - allocated by the caller | |
331 | */ | |
332 | int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp) | |
333 | { | |
334 | acpi_status status; | |
335 | acpi_handle handle, phandle; | |
336 | struct pci_bus *pbus; | |
337 | ||
8647ca9a BH |
338 | if (acpi_pci_disabled) |
339 | return -ENODEV; | |
340 | ||
9ce90ea5 BH |
341 | handle = NULL; |
342 | for (pbus = dev->bus; pbus; pbus = pbus->parent) { | |
343 | handle = acpi_pci_get_bridge_handle(pbus); | |
344 | if (handle) | |
345 | break; | |
346 | } | |
347 | ||
348 | /* | |
349 | * _HPP settings apply to all child buses, until another _HPP is | |
350 | * encountered. If we don't find an _HPP for the input pci dev, | |
351 | * look for it in the parent device scope since that would apply to | |
352 | * this pci dev. | |
353 | */ | |
354 | while (handle) { | |
355 | status = acpi_run_hpx(handle, hpp); | |
356 | if (ACPI_SUCCESS(status)) | |
357 | return 0; | |
358 | status = acpi_run_hpp(handle, hpp); | |
359 | if (ACPI_SUCCESS(status)) | |
360 | return 0; | |
361 | if (acpi_is_root_bridge(handle)) | |
362 | break; | |
363 | status = acpi_get_parent(handle, &phandle); | |
364 | if (ACPI_FAILURE(status)) | |
365 | break; | |
366 | handle = phandle; | |
367 | } | |
368 | return -ENODEV; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(pci_get_hp_params); | |
371 | ||
437eb7bf LW |
372 | /** |
373 | * pciehp_is_native - Check whether a hotplug port is handled by the OS | |
374 | * @pdev: Hotplug port to check | |
375 | * | |
376 | * Walk up from @pdev to the host bridge, obtain its cached _OSC Control Field | |
377 | * and return the value of the "PCI Express Native Hot Plug control" bit. | |
378 | * On failure to obtain the _OSC Control Field return %false. | |
379 | */ | |
380 | bool pciehp_is_native(struct pci_dev *pdev) | |
381 | { | |
382 | struct acpi_pci_root *root; | |
383 | acpi_handle handle; | |
384 | ||
385 | handle = acpi_find_root_bridge_handle(pdev); | |
386 | if (!handle) | |
387 | return false; | |
388 | ||
389 | root = acpi_pci_find_root(handle); | |
390 | if (!root) | |
391 | return false; | |
392 | ||
393 | return root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL; | |
394 | } | |
395 | ||
5e3d2344 BH |
396 | /** |
397 | * pci_acpi_wake_bus - Root bus wakeup notification fork function. | |
398 | * @work: Work item to handle. | |
399 | */ | |
400 | static void pci_acpi_wake_bus(struct work_struct *work) | |
401 | { | |
402 | struct acpi_device *adev; | |
403 | struct acpi_pci_root *root; | |
404 | ||
405 | adev = container_of(work, struct acpi_device, wakeup.context.work); | |
406 | root = acpi_driver_data(adev); | |
407 | pci_pme_wakeup_bus(root->bus); | |
408 | } | |
409 | ||
410 | /** | |
411 | * pci_acpi_wake_dev - PCI device wakeup notification work function. | |
412 | * @handle: ACPI handle of a device the notification is for. | |
413 | * @work: Work item to handle. | |
414 | */ | |
415 | static void pci_acpi_wake_dev(struct work_struct *work) | |
416 | { | |
417 | struct acpi_device_wakeup_context *context; | |
418 | struct pci_dev *pci_dev; | |
419 | ||
420 | context = container_of(work, struct acpi_device_wakeup_context, work); | |
421 | pci_dev = to_pci_dev(context->dev); | |
422 | ||
423 | if (pci_dev->pme_poll) | |
424 | pci_dev->pme_poll = false; | |
425 | ||
426 | if (pci_dev->current_state == PCI_D3cold) { | |
427 | pci_wakeup_event(pci_dev); | |
428 | pm_runtime_resume(&pci_dev->dev); | |
429 | return; | |
430 | } | |
431 | ||
432 | /* Clear PME Status if set. */ | |
433 | if (pci_dev->pme_support) | |
434 | pci_check_pme_status(pci_dev); | |
435 | ||
436 | pci_wakeup_event(pci_dev); | |
437 | pm_runtime_resume(&pci_dev->dev); | |
438 | ||
ff0387c3 | 439 | pci_pme_wakeup_bus(pci_dev->subordinate); |
5e3d2344 BH |
440 | } |
441 | ||
442 | /** | |
443 | * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus. | |
444 | * @dev: PCI root bridge ACPI device. | |
445 | */ | |
446 | acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev) | |
447 | { | |
448 | return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus); | |
449 | } | |
450 | ||
451 | /** | |
452 | * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. | |
453 | * @dev: ACPI device to add the notifier for. | |
454 | * @pci_dev: PCI device to check for the PME status if an event is signaled. | |
455 | */ | |
456 | acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, | |
457 | struct pci_dev *pci_dev) | |
458 | { | |
459 | return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev); | |
460 | } | |
461 | ||
0f64474b DSL |
462 | /* |
463 | * _SxD returns the D-state with the highest power | |
464 | * (lowest D-state number) supported in the S-state "x". | |
465 | * | |
466 | * If the devices does not have a _PRW | |
467 | * (Power Resources for Wake) supporting system wakeup from "x" | |
468 | * then the OS is free to choose a lower power (higher number | |
469 | * D-state) than the return value from _SxD. | |
470 | * | |
471 | * But if _PRW is enabled at S-state "x", the OS | |
472 | * must not choose a power lower than _SxD -- | |
473 | * unless the device has an _SxW method specifying | |
474 | * the lowest power (highest D-state number) the device | |
475 | * may enter while still able to wake the system. | |
476 | * | |
477 | * ie. depending on global OS policy: | |
478 | * | |
479 | * if (_PRW at S-state x) | |
480 | * choose from highest power _SxD to lowest power _SxW | |
481 | * else // no _PRW at S-state x | |
f7625980 | 482 | * choose highest power _SxD or any lower power |
0f64474b DSL |
483 | */ |
484 | ||
8d2bdf49 | 485 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 486 | { |
448bd857 | 487 | int acpi_state, d_max; |
0f64474b | 488 | |
448bd857 HY |
489 | if (pdev->no_d3cold) |
490 | d_max = ACPI_STATE_D3_HOT; | |
491 | else | |
492 | d_max = ACPI_STATE_D3_COLD; | |
493 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); | |
ab826ca4 SL |
494 | if (acpi_state < 0) |
495 | return PCI_POWER_ERROR; | |
496 | ||
497 | switch (acpi_state) { | |
498 | case ACPI_STATE_D0: | |
499 | return PCI_D0; | |
500 | case ACPI_STATE_D1: | |
501 | return PCI_D1; | |
502 | case ACPI_STATE_D2: | |
503 | return PCI_D2; | |
1cc0c998 | 504 | case ACPI_STATE_D3_HOT: |
ab826ca4 | 505 | return PCI_D3hot; |
28c2103d LM |
506 | case ACPI_STATE_D3_COLD: |
507 | return PCI_D3cold; | |
ab826ca4 SL |
508 | } |
509 | return PCI_POWER_ERROR; | |
0f64474b | 510 | } |
961d9120 RW |
511 | |
512 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
513 | { | |
85dbb3d0 RW |
514 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
515 | return adev ? acpi_device_power_manageable(adev) : false; | |
961d9120 | 516 | } |
0f64474b | 517 | |
b913100d DSL |
518 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
519 | { | |
85dbb3d0 | 520 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
583c377f DB |
521 | static const u8 state_conv[] = { |
522 | [PCI_D0] = ACPI_STATE_D0, | |
523 | [PCI_D1] = ACPI_STATE_D1, | |
524 | [PCI_D2] = ACPI_STATE_D2, | |
20dacb71 | 525 | [PCI_D3hot] = ACPI_STATE_D3_HOT, |
fc6504b3 | 526 | [PCI_D3cold] = ACPI_STATE_D3_COLD, |
b913100d | 527 | }; |
44e4e66e | 528 | int error = -EINVAL; |
b913100d | 529 | |
10b3dcae | 530 | /* If the ACPI device has _EJ0, ignore the device */ |
85dbb3d0 | 531 | if (!adev || acpi_has_method(adev->handle, "_EJ0")) |
44e4e66e | 532 | return -ENODEV; |
583c377f DB |
533 | |
534 | switch (state) { | |
8b713a88 RW |
535 | case PCI_D3cold: |
536 | if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == | |
537 | PM_QOS_FLAGS_ALL) { | |
538 | error = -EBUSY; | |
539 | break; | |
540 | } | |
583c377f DB |
541 | case PCI_D0: |
542 | case PCI_D1: | |
543 | case PCI_D2: | |
544 | case PCI_D3hot: | |
85dbb3d0 | 545 | error = acpi_device_set_power(adev, state_conv[state]); |
583c377f | 546 | } |
44e4e66e RW |
547 | |
548 | if (!error) | |
d010e576 | 549 | dev_dbg(&dev->dev, "power state changed by ACPI to %s\n", |
fc6504b3 | 550 | acpi_power_state_string(state_conv[state])); |
44e4e66e RW |
551 | |
552 | return error; | |
b913100d DSL |
553 | } |
554 | ||
cc7cc02b LW |
555 | static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev) |
556 | { | |
557 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); | |
558 | static const pci_power_t state_conv[] = { | |
559 | [ACPI_STATE_D0] = PCI_D0, | |
560 | [ACPI_STATE_D1] = PCI_D1, | |
561 | [ACPI_STATE_D2] = PCI_D2, | |
562 | [ACPI_STATE_D3_HOT] = PCI_D3hot, | |
563 | [ACPI_STATE_D3_COLD] = PCI_D3cold, | |
564 | }; | |
565 | int state; | |
566 | ||
567 | if (!adev || !acpi_device_power_manageable(adev)) | |
568 | return PCI_UNKNOWN; | |
569 | ||
570 | if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN) | |
571 | return PCI_UNKNOWN; | |
572 | ||
573 | return state_conv[state]; | |
574 | } | |
575 | ||
eb9d0fe4 RW |
576 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
577 | { | |
85dbb3d0 RW |
578 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
579 | return adev ? acpi_device_can_wakeup(adev) : false; | |
eb9d0fe4 RW |
580 | } |
581 | ||
0baed8da RW |
582 | static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) |
583 | { | |
584 | while (bus->parent) { | |
dc1a94ae | 585 | if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) |
0baed8da RW |
586 | return; |
587 | bus = bus->parent; | |
588 | } | |
589 | ||
590 | /* We have reached the root bus. */ | |
591 | if (bus->bridge) | |
592 | acpi_pm_device_sleep_wake(bus->bridge, enable); | |
593 | } | |
594 | ||
eb9d0fe4 RW |
595 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) |
596 | { | |
0baed8da RW |
597 | if (acpi_pci_can_wakeup(dev)) |
598 | return acpi_pm_device_sleep_wake(&dev->dev, enable); | |
599 | ||
dc1a94ae | 600 | acpi_pci_propagate_wakeup_enable(dev->bus, enable); |
0baed8da | 601 | return 0; |
eb9d0fe4 RW |
602 | } |
603 | ||
b67ea761 RW |
604 | static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) |
605 | { | |
606 | while (bus->parent) { | |
607 | struct pci_dev *bridge = bus->self; | |
608 | ||
609 | if (bridge->pme_interrupt) | |
610 | return; | |
b24e5098 | 611 | if (!acpi_pm_device_run_wake(&bridge->dev, enable)) |
b67ea761 RW |
612 | return; |
613 | bus = bus->parent; | |
614 | } | |
615 | ||
616 | /* We have reached the root bus. */ | |
617 | if (bus->bridge) | |
b24e5098 | 618 | acpi_pm_device_run_wake(bus->bridge, enable); |
b67ea761 RW |
619 | } |
620 | ||
621 | static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) | |
622 | { | |
448bd857 HY |
623 | /* |
624 | * Per PCI Express Base Specification Revision 2.0 section | |
625 | * 5.3.3.2 Link Wakeup, platform support is needed for D3cold | |
626 | * waking up to power on the main link even if there is PME | |
627 | * support for D3cold | |
628 | */ | |
629 | if (dev->pme_interrupt && !dev->runtime_d3cold) | |
b67ea761 RW |
630 | return 0; |
631 | ||
b24e5098 | 632 | if (!acpi_pm_device_run_wake(&dev->dev, enable)) |
b67ea761 RW |
633 | return 0; |
634 | ||
635 | acpi_pci_propagate_run_wake(dev->bus, enable); | |
636 | return 0; | |
637 | } | |
638 | ||
bac2a909 RW |
639 | static bool acpi_pci_need_resume(struct pci_dev *dev) |
640 | { | |
641 | struct acpi_device *adev = ACPI_COMPANION(&dev->dev); | |
642 | ||
643 | if (!adev || !acpi_device_power_manageable(adev)) | |
644 | return false; | |
645 | ||
646 | if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count) | |
647 | return true; | |
648 | ||
649 | if (acpi_target_system_state() == ACPI_STATE_S0) | |
650 | return false; | |
651 | ||
652 | return !!adev->power.flags.dsw_present; | |
653 | } | |
654 | ||
299f2ffe | 655 | static const struct pci_platform_pm_ops acpi_pci_platform_pm = { |
961d9120 RW |
656 | .is_manageable = acpi_pci_power_manageable, |
657 | .set_state = acpi_pci_set_power_state, | |
cc7cc02b | 658 | .get_state = acpi_pci_get_power_state, |
961d9120 | 659 | .choose_state = acpi_pci_choose_state, |
eb9d0fe4 | 660 | .sleep_wake = acpi_pci_sleep_wake, |
b67ea761 | 661 | .run_wake = acpi_pci_run_wake, |
bac2a909 | 662 | .need_resume = acpi_pci_need_resume, |
961d9120 | 663 | }; |
b913100d | 664 | |
5090d4a6 JL |
665 | void acpi_pci_add_bus(struct pci_bus *bus) |
666 | { | |
e33caa82 AL |
667 | union acpi_object *obj; |
668 | struct pci_host_bridge *bridge; | |
669 | ||
be1c9de9 | 670 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
671 | return; |
672 | ||
be1c9de9 RW |
673 | acpi_pci_slot_enumerate(bus); |
674 | acpiphp_enumerate_slots(bus); | |
e33caa82 AL |
675 | |
676 | /* | |
677 | * For a host bridge, check its _DSM for function 8 and if | |
678 | * that is available, mark it in pci_host_bridge. | |
679 | */ | |
680 | if (!pci_is_root_bus(bus)) | |
681 | return; | |
682 | ||
683 | obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3, | |
684 | RESET_DELAY_DSM, NULL); | |
685 | if (!obj) | |
686 | return; | |
687 | ||
688 | if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) { | |
689 | bridge = pci_find_host_bridge(bus); | |
690 | bridge->ignore_reset_delay = 1; | |
691 | } | |
692 | ACPI_FREE(obj); | |
5090d4a6 JL |
693 | } |
694 | ||
695 | void acpi_pci_remove_bus(struct pci_bus *bus) | |
696 | { | |
be1c9de9 | 697 | if (acpi_pci_disabled || !bus->bridge) |
5090d4a6 JL |
698 | return; |
699 | ||
3b63aaa7 | 700 | acpiphp_remove_slots(bus); |
5c0b04e3 | 701 | acpi_pci_slot_remove(bus); |
5090d4a6 JL |
702 | } |
703 | ||
84df749f | 704 | /* ACPI bus type */ |
e3f02c52 | 705 | static struct acpi_device *acpi_pci_find_companion(struct device *dev) |
84df749f | 706 | { |
60f75b8e | 707 | struct pci_dev *pci_dev = to_pci_dev(dev); |
5ce79d20 | 708 | bool check_children; |
60f75b8e | 709 | u64 addr; |
84df749f | 710 | |
6788a51f | 711 | check_children = pci_is_bridge(pci_dev); |
84df749f DSL |
712 | /* Please ref to ACPI spec for the syntax of _ADR */ |
713 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
e3f02c52 | 714 | return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr, |
5ce79d20 | 715 | check_children); |
84df749f DSL |
716 | } |
717 | ||
e33caa82 AL |
718 | /** |
719 | * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI | |
720 | * @pdev: the PCI device whose delay is to be updated | |
113e0d11 | 721 | * @handle: ACPI handle of this device |
e33caa82 AL |
722 | * |
723 | * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM | |
724 | * control method of either the device itself or the PCI host bridge. | |
725 | * | |
726 | * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI | |
727 | * host bridge. If it returns one, the OS may assume that all devices in | |
728 | * the hierarchy have already completed power-on reset delays. | |
729 | * | |
730 | * Function 9, "Device Readiness Durations," applies only to the object | |
731 | * where it is located. It returns delay durations required after various | |
732 | * events if the device requires less time than the spec requires. Delays | |
733 | * from this function take precedence over the Reset Delay function. | |
734 | * | |
735 | * These _DSM functions are defined by the draft ECN of January 28, 2014, | |
736 | * titled "ACPI additions for FW latency optimizations." | |
737 | */ | |
738 | static void pci_acpi_optimize_delay(struct pci_dev *pdev, | |
739 | acpi_handle handle) | |
740 | { | |
741 | struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus); | |
742 | int value; | |
743 | union acpi_object *obj, *elements; | |
744 | ||
745 | if (bridge->ignore_reset_delay) | |
746 | pdev->d3cold_delay = 0; | |
747 | ||
748 | obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3, | |
749 | FUNCTION_DELAY_DSM, NULL); | |
750 | if (!obj) | |
751 | return; | |
752 | ||
753 | if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) { | |
754 | elements = obj->package.elements; | |
755 | if (elements[0].type == ACPI_TYPE_INTEGER) { | |
756 | value = (int)elements[0].integer.value / 1000; | |
757 | if (value < PCI_PM_D3COLD_WAIT) | |
758 | pdev->d3cold_delay = value; | |
759 | } | |
760 | if (elements[3].type == ACPI_TYPE_INTEGER) { | |
761 | value = (int)elements[3].integer.value / 1000; | |
762 | if (value < PCI_PM_D3_WAIT) | |
763 | pdev->d3_delay = value; | |
764 | } | |
765 | } | |
766 | ACPI_FREE(obj); | |
767 | } | |
768 | ||
38a9a67a | 769 | static void pci_acpi_setup(struct device *dev) |
d2e5f0c1 | 770 | { |
d2e5f0c1 | 771 | struct pci_dev *pci_dev = to_pci_dev(dev); |
f084280c | 772 | struct acpi_device *adev = ACPI_COMPANION(dev); |
38a9a67a | 773 | |
f084280c RW |
774 | if (!adev) |
775 | return; | |
776 | ||
e33caa82 AL |
777 | pci_acpi_optimize_delay(pci_dev, adev->handle); |
778 | ||
f084280c RW |
779 | pci_acpi_add_pm_notifier(adev, pci_dev); |
780 | if (!adev->wakeup.flags.valid) | |
d2e5f0c1 RW |
781 | return; |
782 | ||
783 | device_set_wakeup_capable(dev, true); | |
784 | acpi_pci_sleep_wake(pci_dev, false); | |
d2e5f0c1 RW |
785 | if (adev->wakeup.flags.run_wake) |
786 | device_set_run_wake(dev, true); | |
787 | } | |
788 | ||
38a9a67a | 789 | static void pci_acpi_cleanup(struct device *dev) |
d2e5f0c1 | 790 | { |
f084280c RW |
791 | struct acpi_device *adev = ACPI_COMPANION(dev); |
792 | ||
793 | if (!adev) | |
794 | return; | |
d2e5f0c1 | 795 | |
f084280c RW |
796 | pci_acpi_remove_pm_notifier(adev); |
797 | if (adev->wakeup.flags.valid) { | |
d2e5f0c1 RW |
798 | device_set_wakeup_capable(dev, false); |
799 | device_set_run_wake(dev, false); | |
d2e5f0c1 RW |
800 | } |
801 | } | |
802 | ||
53540098 RW |
803 | static bool pci_acpi_bus_match(struct device *dev) |
804 | { | |
40c368c1 | 805 | return dev_is_pci(dev); |
53540098 RW |
806 | } |
807 | ||
9c273b95 | 808 | static struct acpi_bus_type acpi_pci_bus = { |
53540098 RW |
809 | .name = "PCI", |
810 | .match = pci_acpi_bus_match, | |
e3f02c52 | 811 | .find_companion = acpi_pci_find_companion, |
38a9a67a RW |
812 | .setup = pci_acpi_setup, |
813 | .cleanup = pci_acpi_cleanup, | |
84df749f DSL |
814 | }; |
815 | ||
471036b2 SS |
816 | |
817 | static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev); | |
818 | ||
819 | /** | |
820 | * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode | |
821 | * @fn: Callback matching a device to a fwnode that identifies a PCI | |
822 | * MSI domain. | |
823 | * | |
824 | * This should be called by irqchip driver, which is the parent of | |
825 | * the MSI domain to provide callback interface to query fwnode. | |
826 | */ | |
827 | void | |
828 | pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *)) | |
829 | { | |
830 | pci_msi_get_fwnode_cb = fn; | |
831 | } | |
832 | ||
833 | /** | |
834 | * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge | |
835 | * @bus: The PCI host bridge bus. | |
836 | * | |
837 | * This function uses the callback function registered by | |
838 | * pci_msi_register_fwnode_provider() to retrieve the irq_domain with | |
839 | * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus. | |
840 | * This returns NULL on error or when the domain is not found. | |
841 | */ | |
842 | struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) | |
843 | { | |
844 | struct fwnode_handle *fwnode; | |
845 | ||
846 | if (!pci_msi_get_fwnode_cb) | |
847 | return NULL; | |
848 | ||
849 | fwnode = pci_msi_get_fwnode_cb(&bus->dev); | |
850 | if (!fwnode) | |
851 | return NULL; | |
852 | ||
853 | return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI); | |
854 | } | |
855 | ||
9c273b95 | 856 | static int __init acpi_pci_init(void) |
84df749f DSL |
857 | { |
858 | int ret; | |
859 | ||
993958fe | 860 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { |
e7d45152 | 861 | pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n"); |
f8993aff SL |
862 | pci_no_msi(); |
863 | } | |
5fde244d | 864 | |
993958fe | 865 | if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
e7d45152 | 866 | pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); |
5fde244d SL |
867 | pcie_no_aspm(); |
868 | } | |
869 | ||
9c273b95 | 870 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
871 | if (ret) |
872 | return 0; | |
5c0b04e3 | 873 | |
961d9120 | 874 | pci_set_platform_pm(&acpi_pci_platform_pm); |
5c0b04e3 | 875 | acpi_pci_slot_init(); |
3b63aaa7 | 876 | acpiphp_init(); |
5c0b04e3 | 877 | |
84df749f DSL |
878 | return 0; |
879 | } | |
9c273b95 | 880 | arch_initcall(acpi_pci_init); |