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Bjorn Helgaas7328c8f2018-01-26 11:45:16 -06001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Bjorn Helgaasdf62ab52018-03-09 16:36:33 -06003 * 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/*
Andy Shevchenko94116f82017-06-05 19:40:46 +030024 * The GUID is defined in the PCI Firmware Specification available here:
Aaron Lu18e94a32015-03-25 14:31:41 +080025 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
26 */
Andy Shevchenko94116f82017-06-05 19:40:46 +030027const guid_t pci_acpi_dsm_guid =
28 GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
29 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
Aaron Lu18e94a32015-03-25 14:31:41 +080030
Dongdong Liu169de962016-12-01 00:33:42 -060031#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
32static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
33{
34 struct device *dev = &adev->dev;
35 struct resource_entry *entry;
36 struct list_head list;
37 unsigned long flags;
38 int ret;
39
40 INIT_LIST_HEAD(&list);
41 flags = IORESOURCE_MEM;
42 ret = acpi_dev_get_resources(adev, &list,
43 acpi_dev_filter_resource_type_cb,
44 (void *) flags);
45 if (ret < 0) {
46 dev_err(dev, "failed to parse _CRS method, error code %d\n",
47 ret);
48 return ret;
49 }
50
51 if (ret == 0) {
52 dev_err(dev, "no IO and memory resources present in _CRS\n");
53 return -EINVAL;
54 }
55
56 entry = list_first_entry(&list, struct resource_entry, node);
57 *res = *entry->res;
58 acpi_dev_free_resource_list(&list);
59 return 0;
60}
61
62static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
63 void **retval)
64{
65 u16 *segment = context;
66 unsigned long long uid;
67 acpi_status status;
68
69 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
70 if (ACPI_FAILURE(status) || uid != *segment)
71 return AE_CTRL_DEPTH;
72
73 *(acpi_handle *)retval = handle;
74 return AE_CTRL_TERMINATE;
75}
76
77int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
78 struct resource *res)
79{
80 struct acpi_device *adev;
81 acpi_status status;
82 acpi_handle handle;
83 int ret;
84
85 status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
86 if (ACPI_FAILURE(status)) {
87 dev_err(dev, "can't find _HID %s device to locate resources\n",
88 hid);
89 return -ENODEV;
90 }
91
92 ret = acpi_bus_get_device(handle, &adev);
93 if (ret)
94 return ret;
95
96 ret = acpi_get_rc_addr(adev, res);
97 if (ret) {
98 dev_err(dev, "can't get resource from %s\n",
99 dev_name(&adev->dev));
100 return ret;
101 }
102
103 return 0;
104}
105#endif
106
Jiang Liuf4b57a32012-06-22 14:55:16 +0800107phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
108{
109 acpi_status status = AE_NOT_EXIST;
110 unsigned long long mcfg_addr;
111
112 if (handle)
113 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
114 NULL, &mcfg_addr);
115 if (ACPI_FAILURE(status))
116 return 0;
117
118 return (phys_addr_t)mcfg_addr;
119}
120
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600121static acpi_status decode_type0_hpx_record(union acpi_object *record,
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500122 struct hpp_type0 *hpx0)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600123{
124 int i;
125 union acpi_object *fields = record->package.elements;
126 u32 revision = fields[1].integer.value;
127
128 switch (revision) {
129 case 1:
130 if (record->package.count != 6)
131 return AE_ERROR;
132 for (i = 2; i < 6; i++)
133 if (fields[i].type != ACPI_TYPE_INTEGER)
134 return AE_ERROR;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500135 hpx0->revision = revision;
136 hpx0->cache_line_size = fields[2].integer.value;
137 hpx0->latency_timer = fields[3].integer.value;
138 hpx0->enable_serr = fields[4].integer.value;
139 hpx0->enable_perr = fields[5].integer.value;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600140 break;
141 default:
Mohan Kumar25da8db2019-04-20 07:03:46 +0300142 pr_warn("%s: Type 0 Revision %d record not supported\n",
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600143 __func__, revision);
144 return AE_ERROR;
145 }
146 return AE_OK;
147}
148
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600149static acpi_status decode_type1_hpx_record(union acpi_object *record,
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500150 struct hpp_type1 *hpx1)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600151{
152 int i;
153 union acpi_object *fields = record->package.elements;
154 u32 revision = fields[1].integer.value;
155
156 switch (revision) {
157 case 1:
158 if (record->package.count != 5)
159 return AE_ERROR;
160 for (i = 2; i < 5; i++)
161 if (fields[i].type != ACPI_TYPE_INTEGER)
162 return AE_ERROR;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500163 hpx1->revision = revision;
164 hpx1->max_mem_read = fields[2].integer.value;
165 hpx1->avg_max_split = fields[3].integer.value;
166 hpx1->tot_max_split = fields[4].integer.value;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600167 break;
168 default:
Mohan Kumar25da8db2019-04-20 07:03:46 +0300169 pr_warn("%s: Type 1 Revision %d record not supported\n",
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600170 __func__, revision);
171 return AE_ERROR;
172 }
173 return AE_OK;
174}
175
Bjorn Helgaasabbfec32014-09-12 15:29:55 -0600176static acpi_status decode_type2_hpx_record(union acpi_object *record,
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500177 struct hpp_type2 *hpx2)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600178{
179 int i;
180 union acpi_object *fields = record->package.elements;
181 u32 revision = fields[1].integer.value;
182
183 switch (revision) {
184 case 1:
185 if (record->package.count != 18)
186 return AE_ERROR;
187 for (i = 2; i < 18; i++)
188 if (fields[i].type != ACPI_TYPE_INTEGER)
189 return AE_ERROR;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500190 hpx2->revision = revision;
191 hpx2->unc_err_mask_and = fields[2].integer.value;
192 hpx2->unc_err_mask_or = fields[3].integer.value;
193 hpx2->unc_err_sever_and = fields[4].integer.value;
194 hpx2->unc_err_sever_or = fields[5].integer.value;
195 hpx2->cor_err_mask_and = fields[6].integer.value;
196 hpx2->cor_err_mask_or = fields[7].integer.value;
197 hpx2->adv_err_cap_and = fields[8].integer.value;
198 hpx2->adv_err_cap_or = fields[9].integer.value;
199 hpx2->pci_exp_devctl_and = fields[10].integer.value;
200 hpx2->pci_exp_devctl_or = fields[11].integer.value;
201 hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
202 hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
203 hpx2->sec_unc_err_sever_and = fields[14].integer.value;
204 hpx2->sec_unc_err_sever_or = fields[15].integer.value;
205 hpx2->sec_unc_err_mask_and = fields[16].integer.value;
206 hpx2->sec_unc_err_mask_or = fields[17].integer.value;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600207 break;
208 default:
Mohan Kumar25da8db2019-04-20 07:03:46 +0300209 pr_warn("%s: Type 2 Revision %d record not supported\n",
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600210 __func__, revision);
211 return AE_ERROR;
212 }
213 return AE_OK;
214}
215
Alexandru Gagniucf873c512019-02-08 10:24:13 -0600216static void parse_hpx3_register(struct hpx_type3 *hpx3_reg,
217 union acpi_object *reg_fields)
218{
219 hpx3_reg->device_type = reg_fields[0].integer.value;
220 hpx3_reg->function_type = reg_fields[1].integer.value;
221 hpx3_reg->config_space_location = reg_fields[2].integer.value;
222 hpx3_reg->pci_exp_cap_id = reg_fields[3].integer.value;
223 hpx3_reg->pci_exp_cap_ver = reg_fields[4].integer.value;
224 hpx3_reg->pci_exp_vendor_id = reg_fields[5].integer.value;
225 hpx3_reg->dvsec_id = reg_fields[6].integer.value;
226 hpx3_reg->dvsec_rev = reg_fields[7].integer.value;
227 hpx3_reg->match_offset = reg_fields[8].integer.value;
228 hpx3_reg->match_mask_and = reg_fields[9].integer.value;
229 hpx3_reg->match_value = reg_fields[10].integer.value;
230 hpx3_reg->reg_offset = reg_fields[11].integer.value;
231 hpx3_reg->reg_mask_and = reg_fields[12].integer.value;
232 hpx3_reg->reg_mask_or = reg_fields[13].integer.value;
233}
234
235static acpi_status program_type3_hpx_record(struct pci_dev *dev,
236 union acpi_object *record,
237 const struct hotplug_program_ops *hp_ops)
238{
239 union acpi_object *fields = record->package.elements;
240 u32 desc_count, expected_length, revision;
241 union acpi_object *reg_fields;
242 struct hpx_type3 hpx3;
243 int i;
244
245 revision = fields[1].integer.value;
246 switch (revision) {
247 case 1:
248 desc_count = fields[2].integer.value;
249 expected_length = 3 + desc_count * 14;
250
251 if (record->package.count != expected_length)
252 return AE_ERROR;
253
254 for (i = 2; i < expected_length; i++)
255 if (fields[i].type != ACPI_TYPE_INTEGER)
256 return AE_ERROR;
257
258 for (i = 0; i < desc_count; i++) {
259 reg_fields = fields + 3 + i * 14;
260 parse_hpx3_register(&hpx3, reg_fields);
261 hp_ops->program_type3(dev, &hpx3);
262 }
263
264 break;
265 default:
266 printk(KERN_WARNING
267 "%s: Type 3 Revision %d record not supported\n",
268 __func__, revision);
269 return AE_ERROR;
270 }
271 return AE_OK;
272}
273
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500274static acpi_status acpi_run_hpx(struct pci_dev *dev, acpi_handle handle,
275 const struct hotplug_program_ops *hp_ops)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600276{
277 acpi_status status;
278 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
279 union acpi_object *package, *record, *fields;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500280 struct hpp_type0 hpx0;
281 struct hpp_type1 hpx1;
282 struct hpp_type2 hpx2;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600283 u32 type;
284 int i;
285
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600286 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
287 if (ACPI_FAILURE(status))
288 return status;
289
290 package = (union acpi_object *)buffer.pointer;
291 if (package->type != ACPI_TYPE_PACKAGE) {
292 status = AE_ERROR;
293 goto exit;
294 }
295
296 for (i = 0; i < package->package.count; i++) {
297 record = &package->package.elements[i];
298 if (record->type != ACPI_TYPE_PACKAGE) {
299 status = AE_ERROR;
300 goto exit;
301 }
302
303 fields = record->package.elements;
304 if (fields[0].type != ACPI_TYPE_INTEGER ||
305 fields[1].type != ACPI_TYPE_INTEGER) {
306 status = AE_ERROR;
307 goto exit;
308 }
309
310 type = fields[0].integer.value;
311 switch (type) {
312 case 0:
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500313 memset(&hpx0, 0, sizeof(hpx0));
314 status = decode_type0_hpx_record(record, &hpx0);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600315 if (ACPI_FAILURE(status))
316 goto exit;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500317 hp_ops->program_type0(dev, &hpx0);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600318 break;
319 case 1:
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500320 memset(&hpx1, 0, sizeof(hpx1));
321 status = decode_type1_hpx_record(record, &hpx1);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600322 if (ACPI_FAILURE(status))
323 goto exit;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500324 hp_ops->program_type1(dev, &hpx1);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600325 break;
326 case 2:
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500327 memset(&hpx2, 0, sizeof(hpx2));
328 status = decode_type2_hpx_record(record, &hpx2);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600329 if (ACPI_FAILURE(status))
330 goto exit;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500331 hp_ops->program_type2(dev, &hpx2);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600332 break;
Alexandru Gagniucf873c512019-02-08 10:24:13 -0600333 case 3:
334 status = program_type3_hpx_record(dev, record, hp_ops);
335 if (ACPI_FAILURE(status))
336 goto exit;
337 break;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600338 default:
Mohan Kumar25da8db2019-04-20 07:03:46 +0300339 pr_err("%s: Type %d record not supported\n",
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600340 __func__, type);
341 status = AE_ERROR;
342 goto exit;
343 }
344 }
345 exit:
346 kfree(buffer.pointer);
347 return status;
348}
349
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500350static acpi_status acpi_run_hpp(struct pci_dev *dev, acpi_handle handle,
351 const struct hotplug_program_ops *hp_ops)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600352{
353 acpi_status status;
354 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
355 union acpi_object *package, *fields;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500356 struct hpp_type0 hpp0;
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600357 int i;
358
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500359 memset(&hpp0, 0, sizeof(hpp0));
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600360
361 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
362 if (ACPI_FAILURE(status))
363 return status;
364
365 package = (union acpi_object *) buffer.pointer;
366 if (package->type != ACPI_TYPE_PACKAGE ||
367 package->package.count != 4) {
368 status = AE_ERROR;
369 goto exit;
370 }
371
372 fields = package->package.elements;
373 for (i = 0; i < 4; i++) {
374 if (fields[i].type != ACPI_TYPE_INTEGER) {
375 status = AE_ERROR;
376 goto exit;
377 }
378 }
379
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500380 hpp0.revision = 1;
381 hpp0.cache_line_size = fields[0].integer.value;
382 hpp0.latency_timer = fields[1].integer.value;
383 hpp0.enable_serr = fields[2].integer.value;
384 hpp0.enable_perr = fields[3].integer.value;
385
386 hp_ops->program_type0(dev, &hpp0);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600387
388exit:
389 kfree(buffer.pointer);
390 return status;
391}
392
393/* pci_get_hp_params
394 *
395 * @dev - the pci_dev for which we want parameters
396 * @hpp - allocated by the caller
397 */
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500398int pci_acpi_program_hp_params(struct pci_dev *dev,
399 const struct hotplug_program_ops *hp_ops)
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600400{
401 acpi_status status;
402 acpi_handle handle, phandle;
403 struct pci_bus *pbus;
404
Bjorn Helgaas8647ca9a2015-03-24 11:12:45 -0500405 if (acpi_pci_disabled)
406 return -ENODEV;
407
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600408 handle = NULL;
409 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
410 handle = acpi_pci_get_bridge_handle(pbus);
411 if (handle)
412 break;
413 }
414
415 /*
416 * _HPP settings apply to all child buses, until another _HPP is
417 * encountered. If we don't find an _HPP for the input pci dev,
418 * look for it in the parent device scope since that would apply to
419 * this pci dev.
420 */
421 while (handle) {
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500422 status = acpi_run_hpx(dev, handle, hp_ops);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600423 if (ACPI_SUCCESS(status))
424 return 0;
Alexandru Gagniuc87fcf122019-04-19 14:27:36 -0500425 status = acpi_run_hpp(dev, handle, hp_ops);
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600426 if (ACPI_SUCCESS(status))
427 return 0;
428 if (acpi_is_root_bridge(handle))
429 break;
430 status = acpi_get_parent(handle, &phandle);
431 if (ACPI_FAILURE(status))
432 break;
433 handle = phandle;
434 }
435 return -ENODEV;
436}
Bjorn Helgaas9ce90ea2014-09-12 15:23:14 -0600437
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600438/**
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200439 * pciehp_is_native - Check whether a hotplug port is handled by the OS
Mika Westerberg5352a442018-05-23 17:24:08 -0500440 * @bridge: Hotplug port to check
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200441 *
Mika Westerberg5352a442018-05-23 17:24:08 -0500442 * Returns true if the given @bridge is handled by the native PCIe hotplug
443 * driver.
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200444 */
Mika Westerberg5352a442018-05-23 17:24:08 -0500445bool pciehp_is_native(struct pci_dev *bridge)
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200446{
Mika Westerberg5352a442018-05-23 17:24:08 -0500447 const struct pci_host_bridge *host;
448 u32 slot_cap;
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200449
Mika Westerberg5352a442018-05-23 17:24:08 -0500450 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200451 return false;
452
Mika Westerberg5352a442018-05-23 17:24:08 -0500453 pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
454 if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200455 return false;
456
Mika Westerberg5352a442018-05-23 17:24:08 -0500457 if (pcie_ports_native)
458 return true;
459
460 host = pci_find_host_bridge(bridge->bus);
461 return host->native_pcie_hotplug;
Lukas Wunner437eb7b2016-10-28 10:52:06 +0200462}
463
464/**
Mika Westerberg90cc0c32018-05-31 11:42:11 -0500465 * shpchp_is_native - Check whether a hotplug port is handled by the OS
466 * @bridge: Hotplug port to check
467 *
468 * Returns true if the given @bridge is handled by the native SHPC hotplug
469 * driver.
470 */
471bool shpchp_is_native(struct pci_dev *bridge)
472{
Bjorn Helgaasb03799b2018-06-25 16:49:06 -0500473 return bridge->shpc_managed;
Mika Westerberg90cc0c32018-05-31 11:42:11 -0500474}
475
476/**
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600477 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200478 * @context: Device wakeup context.
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600479 */
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200480static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600481{
482 struct acpi_device *adev;
483 struct acpi_pci_root *root;
484
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200485 adev = container_of(context, struct acpi_device, wakeup.context);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600486 root = acpi_driver_data(adev);
487 pci_pme_wakeup_bus(root->bus);
488}
489
490/**
491 * pci_acpi_wake_dev - PCI device wakeup notification work function.
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200492 * @context: Device wakeup context.
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600493 */
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200494static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600495{
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600496 struct pci_dev *pci_dev;
497
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600498 pci_dev = to_pci_dev(context->dev);
499
500 if (pci_dev->pme_poll)
501 pci_dev->pme_poll = false;
502
503 if (pci_dev->current_state == PCI_D3cold) {
504 pci_wakeup_event(pci_dev);
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200505 pm_request_resume(&pci_dev->dev);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600506 return;
507 }
508
509 /* Clear PME Status if set. */
510 if (pci_dev->pme_support)
511 pci_check_pme_status(pci_dev);
512
513 pci_wakeup_event(pci_dev);
Rafael J. Wysocki64fd1c702017-06-12 22:48:41 +0200514 pm_request_resume(&pci_dev->dev);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600515
Markus Elfringff0387c2014-11-10 21:02:17 -0700516 pci_pme_wakeup_bus(pci_dev->subordinate);
Bjorn Helgaas5e3d2342014-09-12 15:36:29 -0600517}
518
519/**
520 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
521 * @dev: PCI root bridge ACPI device.
522 */
523acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
524{
525 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
526}
527
528/**
529 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
530 * @dev: ACPI device to add the notifier for.
531 * @pci_dev: PCI device to check for the PME status if an event is signaled.
532 */
533acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
534 struct pci_dev *pci_dev)
535{
536 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
537}
538
David Shaohua Li0f644742005-03-19 00:15:48 -0500539/*
540 * _SxD returns the D-state with the highest power
541 * (lowest D-state number) supported in the S-state "x".
542 *
543 * If the devices does not have a _PRW
544 * (Power Resources for Wake) supporting system wakeup from "x"
545 * then the OS is free to choose a lower power (higher number
546 * D-state) than the return value from _SxD.
547 *
548 * But if _PRW is enabled at S-state "x", the OS
549 * must not choose a power lower than _SxD --
550 * unless the device has an _SxW method specifying
551 * the lowest power (highest D-state number) the device
552 * may enter while still able to wake the system.
553 *
554 * ie. depending on global OS policy:
555 *
556 * if (_PRW at S-state x)
557 * choose from highest power _SxD to lowest power _SxW
558 * else // no _PRW at S-state x
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700559 * choose highest power _SxD or any lower power
David Shaohua Li0f644742005-03-19 00:15:48 -0500560 */
561
Rafael J. Wysocki8d2bdf42008-06-05 01:16:37 +0200562static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
David Shaohua Li0f644742005-03-19 00:15:48 -0500563{
Huang Ying448bd852012-06-23 10:23:51 +0800564 int acpi_state, d_max;
David Shaohua Li0f644742005-03-19 00:15:48 -0500565
Huang Ying448bd852012-06-23 10:23:51 +0800566 if (pdev->no_d3cold)
567 d_max = ACPI_STATE_D3_HOT;
568 else
569 d_max = ACPI_STATE_D3_COLD;
570 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
Shaohua Liab826ca2007-07-20 10:03:22 +0800571 if (acpi_state < 0)
572 return PCI_POWER_ERROR;
573
574 switch (acpi_state) {
575 case ACPI_STATE_D0:
576 return PCI_D0;
577 case ACPI_STATE_D1:
578 return PCI_D1;
579 case ACPI_STATE_D2:
580 return PCI_D2;
Lin Ming1cc0c992012-04-23 09:03:49 +0800581 case ACPI_STATE_D3_HOT:
Shaohua Liab826ca2007-07-20 10:03:22 +0800582 return PCI_D3hot;
Lin Ming28c21032011-05-04 22:56:43 +0800583 case ACPI_STATE_D3_COLD:
584 return PCI_D3cold;
Shaohua Liab826ca2007-07-20 10:03:22 +0800585 }
586 return PCI_POWER_ERROR;
David Shaohua Li0f644742005-03-19 00:15:48 -0500587}
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200588
Mika Westerberg26ad34d52018-09-27 16:57:14 -0500589static struct acpi_device *acpi_pci_find_companion(struct device *dev);
590
591static bool acpi_pci_bridge_d3(struct pci_dev *dev)
592{
593 const struct fwnode_handle *fwnode;
594 struct acpi_device *adev;
595 struct pci_dev *root;
596 u8 val;
597
598 if (!dev->is_hotplug_bridge)
599 return false;
600
601 /*
602 * Look for a special _DSD property for the root port and if it
603 * is set we know the hierarchy behind it supports D3 just fine.
604 */
605 root = pci_find_pcie_root_port(dev);
606 if (!root)
607 return false;
608
609 adev = ACPI_COMPANION(&root->dev);
610 if (root == dev) {
611 /*
612 * It is possible that the ACPI companion is not yet bound
613 * for the root port so look it up manually here.
614 */
615 if (!adev && !pci_dev_is_added(root))
616 adev = acpi_pci_find_companion(&root->dev);
617 }
618
619 if (!adev)
620 return false;
621
622 fwnode = acpi_fwnode_handle(adev);
623 if (fwnode_property_read_u8(fwnode, "HotPlugSupportInD3", &val))
624 return false;
625
626 return val == 1;
627}
628
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200629static bool acpi_pci_power_manageable(struct pci_dev *dev)
630{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200631 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
632 return adev ? acpi_device_power_manageable(adev) : false;
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200633}
David Shaohua Li0f644742005-03-19 00:15:48 -0500634
David Shaohua Lib9131002005-03-19 00:16:18 -0500635static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
636{
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200637 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
David Brownell583c3772008-02-22 21:41:51 -0800638 static const u8 state_conv[] = {
639 [PCI_D0] = ACPI_STATE_D0,
640 [PCI_D1] = ACPI_STATE_D1,
641 [PCI_D2] = ACPI_STATE_D2,
Rafael J. Wysocki20dacb72015-05-16 01:55:35 +0200642 [PCI_D3hot] = ACPI_STATE_D3_HOT,
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200643 [PCI_D3cold] = ACPI_STATE_D3_COLD,
David Shaohua Lib9131002005-03-19 00:16:18 -0500644 };
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200645 int error = -EINVAL;
David Shaohua Lib9131002005-03-19 00:16:18 -0500646
Shaohua Li10b3dca2007-07-20 10:03:25 +0800647 /* If the ACPI device has _EJ0, ignore the device */
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200648 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200649 return -ENODEV;
David Brownell583c3772008-02-22 21:41:51 -0800650
651 switch (state) {
Rafael J. Wysocki8b713a82012-10-24 02:08:38 +0200652 case PCI_D3cold:
653 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
654 PM_QOS_FLAGS_ALL) {
655 error = -EBUSY;
656 break;
657 }
Gustavo A. R. Silvafa295be2018-10-04 17:40:41 +0200658 /* Fall through */
David Brownell583c3772008-02-22 21:41:51 -0800659 case PCI_D0:
660 case PCI_D1:
661 case PCI_D2:
662 case PCI_D3hot:
Rafael J. Wysocki85dbb3d2014-07-24 01:18:53 +0200663 error = acpi_device_set_power(adev, state_conv[state]);
David Brownell583c3772008-02-22 21:41:51 -0800664 }
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200665
666 if (!error)
Frederick Lawler7506dc72018-01-18 12:55:24 -0600667 pci_dbg(dev, "power state changed by ACPI to %s\n",
Rafael J. Wysockifc6504b2013-06-14 00:29:50 +0200668 acpi_power_state_string(state_conv[state]));
Rafael J. Wysocki44e4e662008-07-07 03:32:52 +0200669
670 return error;
David Shaohua Lib9131002005-03-19 00:16:18 -0500671}
672
Lukas Wunnercc7cc022016-09-18 05:39:20 +0200673static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
674{
675 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
676 static const pci_power_t state_conv[] = {
677 [ACPI_STATE_D0] = PCI_D0,
678 [ACPI_STATE_D1] = PCI_D1,
679 [ACPI_STATE_D2] = PCI_D2,
680 [ACPI_STATE_D3_HOT] = PCI_D3hot,
681 [ACPI_STATE_D3_COLD] = PCI_D3cold,
682 };
683 int state;
684
685 if (!adev || !acpi_device_power_manageable(adev))
686 return PCI_UNKNOWN;
687
Mika Westerberg83a16e32019-06-25 13:29:40 +0300688 state = adev->power.state;
689 if (state == ACPI_STATE_UNKNOWN)
Lukas Wunnercc7cc022016-09-18 05:39:20 +0200690 return PCI_UNKNOWN;
691
692 return state_conv[state];
693}
694
Rafael J. Wysockib51033e2019-06-25 14:09:12 +0200695static void acpi_pci_refresh_power_state(struct pci_dev *dev)
696{
697 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
698
699 if (adev && acpi_device_power_manageable(adev))
700 acpi_device_update_power(adev, NULL);
701}
702
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200703static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200704{
705 while (bus->parent) {
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200706 if (acpi_pm_device_can_wakeup(&bus->self->dev))
Rafael J. Wysocki1ba51a72017-08-01 02:56:18 +0200707 return acpi_pm_set_bridge_wakeup(&bus->self->dev, enable);
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200708
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200709 bus = bus->parent;
710 }
711
712 /* We have reached the root bus. */
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200713 if (bus->bridge) {
714 if (acpi_pm_device_can_wakeup(bus->bridge))
Rafael J. Wysocki1ba51a72017-08-01 02:56:18 +0200715 return acpi_pm_set_bridge_wakeup(bus->bridge, enable);
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200716 }
717 return 0;
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200718}
719
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200720static int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200721{
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200722 if (acpi_pm_device_can_wakeup(&dev->dev))
Rafael J. Wysocki4d183d02017-06-24 01:54:39 +0200723 return acpi_pm_set_device_wakeup(&dev->dev, enable);
Rafael J. Wysocki0baed8d2009-09-08 23:16:24 +0200724
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200725 return acpi_pci_propagate_wakeup(dev->bus, enable);
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100726}
727
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100728static bool acpi_pci_need_resume(struct pci_dev *dev)
729{
730 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
731
Rafael J. Wysocki26112dd2018-06-30 23:19:33 +0200732 /*
733 * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
734 * system-wide suspend/resume confuses the platform firmware, so avoid
Rafael J. Wysocki9d64b5392018-08-16 12:56:46 +0200735 * doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
Rafael J. Wysocki26112dd2018-06-30 23:19:33 +0200736 * devices are expected to be in D3 before invoking the S3 entry path
737 * from the firmware, so they should not be affected by this issue.
738 */
Rafael J. Wysocki9d64b5392018-08-16 12:56:46 +0200739 if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
Rafael J. Wysocki26112dd2018-06-30 23:19:33 +0200740 return true;
741
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100742 if (!adev || !acpi_device_power_manageable(adev))
743 return false;
744
Rafael J. Wysocki9a51c6b2019-05-16 12:42:20 +0200745 if (adev->wakeup.flags.valid &&
746 device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100747 return true;
748
749 if (acpi_target_system_state() == ACPI_STATE_S0)
750 return false;
751
752 return !!adev->power.flags.dsw_present;
753}
754
Julia Lawall299f2ff2015-12-06 17:33:45 +0100755static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
Mika Westerberg26ad34d52018-09-27 16:57:14 -0500756 .bridge_d3 = acpi_pci_bridge_d3,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200757 .is_manageable = acpi_pci_power_manageable,
758 .set_state = acpi_pci_set_power_state,
Lukas Wunnercc7cc022016-09-18 05:39:20 +0200759 .get_state = acpi_pci_get_power_state,
Rafael J. Wysockib51033e2019-06-25 14:09:12 +0200760 .refresh_state = acpi_pci_refresh_power_state,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200761 .choose_state = acpi_pci_choose_state,
Rafael J. Wysocki08476842017-06-24 01:57:35 +0200762 .set_wakeup = acpi_pci_wakeup,
Rafael J. Wysockibac2a902015-01-21 02:17:42 +0100763 .need_resume = acpi_pci_need_resume,
Rafael J. Wysocki961d9122008-07-07 03:32:02 +0200764};
David Shaohua Lib9131002005-03-19 00:16:18 -0500765
Jiang Liu5090d4a2013-04-12 05:44:21 +0000766void acpi_pci_add_bus(struct pci_bus *bus)
767{
Aaron Lue33caa82015-03-25 14:37:06 +0800768 union acpi_object *obj;
769 struct pci_host_bridge *bridge;
770
Vitaly Kuznetsova0040c02017-09-14 16:50:14 +0200771 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
Jiang Liu5090d4a2013-04-12 05:44:21 +0000772 return;
773
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200774 acpi_pci_slot_enumerate(bus);
775 acpiphp_enumerate_slots(bus);
Aaron Lue33caa82015-03-25 14:37:06 +0800776
777 /*
778 * For a host bridge, check its _DSM for function 8 and if
779 * that is available, mark it in pci_host_bridge.
780 */
781 if (!pci_is_root_bus(bus))
782 return;
783
Andy Shevchenko94116f82017-06-05 19:40:46 +0300784 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
Aaron Lue33caa82015-03-25 14:37:06 +0800785 RESET_DELAY_DSM, NULL);
786 if (!obj)
787 return;
788
789 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
790 bridge = pci_find_host_bridge(bus);
791 bridge->ignore_reset_delay = 1;
792 }
793 ACPI_FREE(obj);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000794}
795
796void acpi_pci_remove_bus(struct pci_bus *bus)
797{
Rafael J. Wysockibe1c9de2013-07-13 23:27:23 +0200798 if (acpi_pci_disabled || !bus->bridge)
Jiang Liu5090d4a2013-04-12 05:44:21 +0000799 return;
800
Jiang Liu3b63aaa2013-04-12 05:44:26 +0000801 acpiphp_remove_slots(bus);
Jiang Liu5c0b04e2013-04-12 05:44:24 +0000802 acpi_pci_slot_remove(bus);
Jiang Liu5090d4a2013-04-12 05:44:21 +0000803}
804
David Shaohua Li84df749f2005-03-18 18:53:36 -0500805/* ACPI bus type */
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100806static struct acpi_device *acpi_pci_find_companion(struct device *dev)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500807{
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200808 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100809 bool check_children;
Rafael J. Wysocki60f75b82013-08-07 22:55:00 +0200810 u64 addr;
David Shaohua Li84df749f2005-03-18 18:53:36 -0500811
Yijing Wang6788a512014-05-04 12:23:38 +0800812 check_children = pci_is_bridge(pci_dev);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500813 /* Please ref to ACPI spec for the syntax of _ADR */
814 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100815 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
Rafael J. Wysocki5ce79d22013-11-28 23:58:08 +0100816 check_children);
David Shaohua Li84df749f2005-03-18 18:53:36 -0500817}
818
Aaron Lue33caa82015-03-25 14:37:06 +0800819/**
820 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
821 * @pdev: the PCI device whose delay is to be updated
Srinidhi Kasagar113e0d12015-07-15 14:59:46 +0530822 * @handle: ACPI handle of this device
Aaron Lue33caa82015-03-25 14:37:06 +0800823 *
824 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
825 * control method of either the device itself or the PCI host bridge.
826 *
827 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
828 * host bridge. If it returns one, the OS may assume that all devices in
829 * the hierarchy have already completed power-on reset delays.
830 *
831 * Function 9, "Device Readiness Durations," applies only to the object
832 * where it is located. It returns delay durations required after various
833 * events if the device requires less time than the spec requires. Delays
834 * from this function take precedence over the Reset Delay function.
835 *
836 * These _DSM functions are defined by the draft ECN of January 28, 2014,
837 * titled "ACPI additions for FW latency optimizations."
838 */
839static void pci_acpi_optimize_delay(struct pci_dev *pdev,
840 acpi_handle handle)
841{
842 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
843 int value;
844 union acpi_object *obj, *elements;
845
846 if (bridge->ignore_reset_delay)
847 pdev->d3cold_delay = 0;
848
Andy Shevchenko94116f82017-06-05 19:40:46 +0300849 obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
Aaron Lue33caa82015-03-25 14:37:06 +0800850 FUNCTION_DELAY_DSM, NULL);
851 if (!obj)
852 return;
853
854 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
855 elements = obj->package.elements;
856 if (elements[0].type == ACPI_TYPE_INTEGER) {
857 value = (int)elements[0].integer.value / 1000;
858 if (value < PCI_PM_D3COLD_WAIT)
859 pdev->d3cold_delay = value;
860 }
861 if (elements[3].type == ACPI_TYPE_INTEGER) {
862 value = (int)elements[3].integer.value / 1000;
863 if (value < PCI_PM_D3_WAIT)
864 pdev->d3_delay = value;
865 }
866 }
867 ACPI_FREE(obj);
868}
869
Mika Westerberg617654a2018-08-16 12:28:48 +0300870static void pci_acpi_set_untrusted(struct pci_dev *dev)
871{
872 u8 val;
873
874 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
875 return;
876 if (device_property_read_u8(&dev->dev, "ExternalFacingPort", &val))
877 return;
878
879 /*
880 * These root ports expose PCIe (including DMA) outside of the
881 * system so make sure we treat them and everything behind as
882 * untrusted.
883 */
884 if (val)
885 dev->untrusted = 1;
886}
887
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100888static void pci_acpi_setup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100889{
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100890 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100891 struct acpi_device *adev = ACPI_COMPANION(dev);
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100892
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100893 if (!adev)
894 return;
895
Aaron Lue33caa82015-03-25 14:37:06 +0800896 pci_acpi_optimize_delay(pci_dev, adev->handle);
Mika Westerberg617654a2018-08-16 12:28:48 +0300897 pci_acpi_set_untrusted(pci_dev);
Aaron Lue33caa82015-03-25 14:37:06 +0800898
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100899 pci_acpi_add_pm_notifier(adev, pci_dev);
900 if (!adev->wakeup.flags.valid)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100901 return;
902
903 device_set_wakeup_capable(dev, true);
Mika Westerberg6299cf92018-09-27 16:54:13 -0500904 /*
905 * For bridges that can do D3 we enable wake automatically (as
906 * we do for the power management itself in that case). The
907 * reason is that the bridge may have additional methods such as
908 * _DSW that need to be called.
909 */
910 if (pci_dev->bridge_d3)
911 device_wakeup_enable(dev);
912
Rafael J. Wysocki8370c2d2017-06-24 01:56:13 +0200913 acpi_pci_wakeup(pci_dev, false);
Mika Westerberg53b22f92019-06-25 13:29:42 +0300914 acpi_device_power_add_dependent(adev, dev);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100915}
916
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100917static void pci_acpi_cleanup(struct device *dev)
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100918{
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100919 struct acpi_device *adev = ACPI_COMPANION(dev);
Mika Westerberg6299cf92018-09-27 16:54:13 -0500920 struct pci_dev *pci_dev = to_pci_dev(dev);
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100921
Rafael J. Wysockif0842802013-12-29 23:37:15 +0100922 if (!adev)
923 return;
924
925 pci_acpi_remove_pm_notifier(adev);
Mika Westerberg6299cf92018-09-27 16:54:13 -0500926 if (adev->wakeup.flags.valid) {
Mika Westerberg53b22f92019-06-25 13:29:42 +0300927 acpi_device_power_remove_dependent(adev, dev);
Mika Westerberg6299cf92018-09-27 16:54:13 -0500928 if (pci_dev->bridge_d3)
929 device_wakeup_disable(dev);
930
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100931 device_set_wakeup_capable(dev, false);
Mika Westerberg6299cf92018-09-27 16:54:13 -0500932 }
Rafael J. Wysockid2e5f0c2012-12-23 00:02:44 +0100933}
934
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100935static bool pci_acpi_bus_match(struct device *dev)
936{
Yijing Wang40c368c2013-12-05 19:52:53 +0800937 return dev_is_pci(dev);
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100938}
939
Muthu Kumar9c273b92006-04-28 00:42:21 -0700940static struct acpi_bus_type acpi_pci_bus = {
Rafael J. Wysocki53540092013-03-03 22:35:20 +0100941 .name = "PCI",
942 .match = pci_acpi_bus_match,
Rafael J. Wysockie3f02c52013-11-29 16:27:34 +0100943 .find_companion = acpi_pci_find_companion,
Rafael J. Wysocki38a9a672012-12-23 00:02:54 +0100944 .setup = pci_acpi_setup,
945 .cleanup = pci_acpi_cleanup,
David Shaohua Li84df749f2005-03-18 18:53:36 -0500946};
947
Suravee Suthikulpanit471036b2015-12-10 08:55:27 -0800948
949static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
950
951/**
952 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
953 * @fn: Callback matching a device to a fwnode that identifies a PCI
954 * MSI domain.
955 *
956 * This should be called by irqchip driver, which is the parent of
957 * the MSI domain to provide callback interface to query fwnode.
958 */
959void
960pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
961{
962 pci_msi_get_fwnode_cb = fn;
963}
964
965/**
966 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
967 * @bus: The PCI host bridge bus.
968 *
969 * This function uses the callback function registered by
970 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
971 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
972 * This returns NULL on error or when the domain is not found.
973 */
974struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
975{
976 struct fwnode_handle *fwnode;
977
978 if (!pci_msi_get_fwnode_cb)
979 return NULL;
980
981 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
982 if (!fwnode)
983 return NULL;
984
985 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
986}
987
Muthu Kumar9c273b92006-04-28 00:42:21 -0700988static int __init acpi_pci_init(void)
David Shaohua Li84df749f2005-03-18 18:53:36 -0500989{
990 int ret;
991
Bob Moore993958f2009-02-03 15:14:33 +0800992 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
Yijing Wange7d45152013-05-28 16:03:46 +0800993 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
Shaohua Lif8993af2007-04-25 11:05:12 +0800994 pci_no_msi();
995 }
Shaohua Li5fde2442008-07-23 10:32:24 +0800996
Bob Moore993958f2009-02-03 15:14:33 +0800997 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
Yijing Wange7d45152013-05-28 16:03:46 +0800998 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
Shaohua Li5fde2442008-07-23 10:32:24 +0800999 pcie_no_aspm();
1000 }
1001
Muthu Kumar9c273b92006-04-28 00:42:21 -07001002 ret = register_acpi_bus_type(&acpi_pci_bus);
David Shaohua Li84df749f2005-03-18 18:53:36 -05001003 if (ret)
1004 return 0;
Jiang Liu5c0b04e2013-04-12 05:44:24 +00001005
Rafael J. Wysocki961d9122008-07-07 03:32:02 +02001006 pci_set_platform_pm(&acpi_pci_platform_pm);
Jiang Liu5c0b04e2013-04-12 05:44:24 +00001007 acpi_pci_slot_init();
Jiang Liu3b63aaa2013-04-12 05:44:26 +00001008 acpiphp_init();
Jiang Liu5c0b04e2013-04-12 05:44:24 +00001009
David Shaohua Li84df749f2005-03-18 18:53:36 -05001010 return 0;
1011}
Muthu Kumar9c273b92006-04-28 00:42:21 -07001012arch_initcall(acpi_pci_init);