?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / pci / pci-acpi.c
blobd21969fba6ab0db5083f4a8d284c7f635597c3ec
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * PCI support in ACPI
4 *
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.
8 */
9
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/irqdomain.h>
13 #include <linux/pci.h>
14 #include <linux/msi.h>
15 #include <linux/pci_hotplug.h>
16 #include <linux/module.h>
17 #include <linux/pci-acpi.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/pm_qos.h>
20 #include "pci.h"
21
22 /*
23 * The GUID is defined in the PCI Firmware Specification available here:
24 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
25 */
26 const guid_t pci_acpi_dsm_guid =
27 GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
28 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
29
30 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
31 static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
32 {
33 struct device *dev = &adev->dev;
34 struct resource_entry *entry;
35 struct list_head list;
36 unsigned long flags;
37 int ret;
38
39 INIT_LIST_HEAD(&list);
40 flags = IORESOURCE_MEM;
41 ret = acpi_dev_get_resources(adev, &list,
42 acpi_dev_filter_resource_type_cb,
43 (void *) flags);
44 if (ret < 0) {
45 dev_err(dev, "failed to parse _CRS method, error code %d\n",
46 ret);
47 return ret;
48 }
49
50 if (ret == 0) {
51 dev_err(dev, "no IO and memory resources present in _CRS\n");
52 return -EINVAL;
53 }
54
55 entry = list_first_entry(&list, struct resource_entry, node);
56 *res = *entry->res;
57 acpi_dev_free_resource_list(&list);
58 return 0;
59 }
60
61 static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
62 void **retval)
63 {
64 u16 *segment = context;
65 unsigned long long uid;
66 acpi_status status;
67
68 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
69 if (ACPI_FAILURE(status) || uid != *segment)
70 return AE_CTRL_DEPTH;
71
72 *(acpi_handle *)retval = handle;
73 return AE_CTRL_TERMINATE;
74 }
75
76 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
77 struct resource *res)
78 {
79 struct acpi_device *adev;
80 acpi_status status;
81 acpi_handle handle;
82 int ret;
83
84 status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
85 if (ACPI_FAILURE(status)) {
86 dev_err(dev, "can't find _HID %s device to locate resources\n",
87 hid);
88 return -ENODEV;
89 }
90
91 ret = acpi_bus_get_device(handle, &adev);
92 if (ret)
93 return ret;
94
95 ret = acpi_get_rc_addr(adev, res);
96 if (ret) {
97 dev_err(dev, "can't get resource from %s\n",
98 dev_name(&adev->dev));
99 return ret;
100 }
101
102 return 0;
103 }
104 #endif
105
106 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
107 {
108 acpi_status status = AE_NOT_EXIST;
109 unsigned long long mcfg_addr;
110
111 if (handle)
112 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
113 NULL, &mcfg_addr);
114 if (ACPI_FAILURE(status))
115 return 0;
116
117 return (phys_addr_t)mcfg_addr;
118 }
119
120 /* _HPX PCI Setting Record (Type 0); same as _HPP */
121 struct hpx_type0 {
122 u32 revision; /* Not present in _HPP */
123 u8 cache_line_size; /* Not applicable to PCIe */
124 u8 latency_timer; /* Not applicable to PCIe */
125 u8 enable_serr;
126 u8 enable_perr;
127 };
128
129 static struct hpx_type0 pci_default_type0 = {
130 .revision = 1,
131 .cache_line_size = 8,
132 .latency_timer = 0x40,
133 .enable_serr = 0,
134 .enable_perr = 0,
135 };
136
137 static void program_hpx_type0(struct pci_dev *dev, struct hpx_type0 *hpx)
138 {
139 u16 pci_cmd, pci_bctl;
140
141 if (!hpx)
142 hpx = &pci_default_type0;
143
144 if (hpx->revision > 1) {
145 pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
146 hpx->revision);
147 hpx = &pci_default_type0;
148 }
149
150 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpx->cache_line_size);
151 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpx->latency_timer);
152 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
153 if (hpx->enable_serr)
154 pci_cmd |= PCI_COMMAND_SERR;
155 if (hpx->enable_perr)
156 pci_cmd |= PCI_COMMAND_PARITY;
157 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
158
159 /* Program bridge control value */
160 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
161 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
162 hpx->latency_timer);
163 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
164 if (hpx->enable_perr)
165 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
166 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
167 }
168 }
169
170 static acpi_status decode_type0_hpx_record(union acpi_object *record,
171 struct hpx_type0 *hpx0)
172 {
173 int i;
174 union acpi_object *fields = record->package.elements;
175 u32 revision = fields[1].integer.value;
176
177 switch (revision) {
178 case 1:
179 if (record->package.count != 6)
180 return AE_ERROR;
181 for (i = 2; i < 6; i++)
182 if (fields[i].type != ACPI_TYPE_INTEGER)
183 return AE_ERROR;
184 hpx0->revision = revision;
185 hpx0->cache_line_size = fields[2].integer.value;
186 hpx0->latency_timer = fields[3].integer.value;
187 hpx0->enable_serr = fields[4].integer.value;
188 hpx0->enable_perr = fields[5].integer.value;
189 break;
190 default:
191 pr_warn("%s: Type 0 Revision %d record not supported\n",
192 __func__, revision);
193 return AE_ERROR;
194 }
195 return AE_OK;
196 }
197
198 /* _HPX PCI-X Setting Record (Type 1) */
199 struct hpx_type1 {
200 u32 revision;
201 u8 max_mem_read;
202 u8 avg_max_split;
203 u16 tot_max_split;
204 };
205
206 static void program_hpx_type1(struct pci_dev *dev, struct hpx_type1 *hpx)
207 {
208 int pos;
209
210 if (!hpx)
211 return;
212
213 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
214 if (!pos)
215 return;
216
217 pci_warn(dev, "PCI-X settings not supported\n");
218 }
219
220 static acpi_status decode_type1_hpx_record(union acpi_object *record,
221 struct hpx_type1 *hpx1)
222 {
223 int i;
224 union acpi_object *fields = record->package.elements;
225 u32 revision = fields[1].integer.value;
226
227 switch (revision) {
228 case 1:
229 if (record->package.count != 5)
230 return AE_ERROR;
231 for (i = 2; i < 5; i++)
232 if (fields[i].type != ACPI_TYPE_INTEGER)
233 return AE_ERROR;
234 hpx1->revision = revision;
235 hpx1->max_mem_read = fields[2].integer.value;
236 hpx1->avg_max_split = fields[3].integer.value;
237 hpx1->tot_max_split = fields[4].integer.value;
238 break;
239 default:
240 pr_warn("%s: Type 1 Revision %d record not supported\n",
241 __func__, revision);
242 return AE_ERROR;
243 }
244 return AE_OK;
245 }
246
247 static bool pcie_root_rcb_set(struct pci_dev *dev)
248 {
249 struct pci_dev *rp = pcie_find_root_port(dev);
250 u16 lnkctl;
251
252 if (!rp)
253 return false;
254
255 pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
256 if (lnkctl & PCI_EXP_LNKCTL_RCB)
257 return true;
258
259 return false;
260 }
261
262 /* _HPX PCI Express Setting Record (Type 2) */
263 struct hpx_type2 {
264 u32 revision;
265 u32 unc_err_mask_and;
266 u32 unc_err_mask_or;
267 u32 unc_err_sever_and;
268 u32 unc_err_sever_or;
269 u32 cor_err_mask_and;
270 u32 cor_err_mask_or;
271 u32 adv_err_cap_and;
272 u32 adv_err_cap_or;
273 u16 pci_exp_devctl_and;
274 u16 pci_exp_devctl_or;
275 u16 pci_exp_lnkctl_and;
276 u16 pci_exp_lnkctl_or;
277 u32 sec_unc_err_sever_and;
278 u32 sec_unc_err_sever_or;
279 u32 sec_unc_err_mask_and;
280 u32 sec_unc_err_mask_or;
281 };
282
283 static void program_hpx_type2(struct pci_dev *dev, struct hpx_type2 *hpx)
284 {
285 int pos;
286 u32 reg32;
287
288 if (!hpx)
289 return;
290
291 if (!pci_is_pcie(dev))
292 return;
293
294 if (hpx->revision > 1) {
295 pci_warn(dev, "PCIe settings rev %d not supported\n",
296 hpx->revision);
297 return;
298 }
299
300 /*
301 * Don't allow _HPX to change MPS or MRRS settings. We manage
302 * those to make sure they're consistent with the rest of the
303 * platform.
304 */
305 hpx->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
306 PCI_EXP_DEVCTL_READRQ;
307 hpx->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
308 PCI_EXP_DEVCTL_READRQ);
309
310 /* Initialize Device Control Register */
311 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
312 ~hpx->pci_exp_devctl_and, hpx->pci_exp_devctl_or);
313
314 /* Initialize Link Control Register */
315 if (pcie_cap_has_lnkctl(dev)) {
316
317 /*
318 * If the Root Port supports Read Completion Boundary of
319 * 128, set RCB to 128. Otherwise, clear it.
320 */
321 hpx->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
322 hpx->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
323 if (pcie_root_rcb_set(dev))
324 hpx->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
325
326 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
327 ~hpx->pci_exp_lnkctl_and, hpx->pci_exp_lnkctl_or);
328 }
329
330 /* Find Advanced Error Reporting Enhanced Capability */
331 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
332 if (!pos)
333 return;
334
335 /* Initialize Uncorrectable Error Mask Register */
336 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &reg32);
337 reg32 = (reg32 & hpx->unc_err_mask_and) | hpx->unc_err_mask_or;
338 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
339
340 /* Initialize Uncorrectable Error Severity Register */
341 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &reg32);
342 reg32 = (reg32 & hpx->unc_err_sever_and) | hpx->unc_err_sever_or;
343 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
344
345 /* Initialize Correctable Error Mask Register */
346 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg32);
347 reg32 = (reg32 & hpx->cor_err_mask_and) | hpx->cor_err_mask_or;
348 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
349
350 /* Initialize Advanced Error Capabilities and Control Register */
351 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
352 reg32 = (reg32 & hpx->adv_err_cap_and) | hpx->adv_err_cap_or;
353
354 /* Don't enable ECRC generation or checking if unsupported */
355 if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
356 reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
357 if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
358 reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
359 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
360
361 /*
362 * FIXME: The following two registers are not supported yet.
363 *
364 * o Secondary Uncorrectable Error Severity Register
365 * o Secondary Uncorrectable Error Mask Register
366 */
367 }
368
369 static acpi_status decode_type2_hpx_record(union acpi_object *record,
370 struct hpx_type2 *hpx2)
371 {
372 int i;
373 union acpi_object *fields = record->package.elements;
374 u32 revision = fields[1].integer.value;
375
376 switch (revision) {
377 case 1:
378 if (record->package.count != 18)
379 return AE_ERROR;
380 for (i = 2; i < 18; i++)
381 if (fields[i].type != ACPI_TYPE_INTEGER)
382 return AE_ERROR;
383 hpx2->revision = revision;
384 hpx2->unc_err_mask_and = fields[2].integer.value;
385 hpx2->unc_err_mask_or = fields[3].integer.value;
386 hpx2->unc_err_sever_and = fields[4].integer.value;
387 hpx2->unc_err_sever_or = fields[5].integer.value;
388 hpx2->cor_err_mask_and = fields[6].integer.value;
389 hpx2->cor_err_mask_or = fields[7].integer.value;
390 hpx2->adv_err_cap_and = fields[8].integer.value;
391 hpx2->adv_err_cap_or = fields[9].integer.value;
392 hpx2->pci_exp_devctl_and = fields[10].integer.value;
393 hpx2->pci_exp_devctl_or = fields[11].integer.value;
394 hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
395 hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
396 hpx2->sec_unc_err_sever_and = fields[14].integer.value;
397 hpx2->sec_unc_err_sever_or = fields[15].integer.value;
398 hpx2->sec_unc_err_mask_and = fields[16].integer.value;
399 hpx2->sec_unc_err_mask_or = fields[17].integer.value;
400 break;
401 default:
402 pr_warn("%s: Type 2 Revision %d record not supported\n",
403 __func__, revision);
404 return AE_ERROR;
405 }
406 return AE_OK;
407 }
408
409 /* _HPX PCI Express Setting Record (Type 3) */
410 struct hpx_type3 {
411 u16 device_type;
412 u16 function_type;
413 u16 config_space_location;
414 u16 pci_exp_cap_id;
415 u16 pci_exp_cap_ver;
416 u16 pci_exp_vendor_id;
417 u16 dvsec_id;
418 u16 dvsec_rev;
419 u16 match_offset;
420 u32 match_mask_and;
421 u32 match_value;
422 u16 reg_offset;
423 u32 reg_mask_and;
424 u32 reg_mask_or;
425 };
426
427 enum hpx_type3_dev_type {
428 HPX_TYPE_ENDPOINT = BIT(0),
429 HPX_TYPE_LEG_END = BIT(1),
430 HPX_TYPE_RC_END = BIT(2),
431 HPX_TYPE_RC_EC = BIT(3),
432 HPX_TYPE_ROOT_PORT = BIT(4),
433 HPX_TYPE_UPSTREAM = BIT(5),
434 HPX_TYPE_DOWNSTREAM = BIT(6),
435 HPX_TYPE_PCI_BRIDGE = BIT(7),
436 HPX_TYPE_PCIE_BRIDGE = BIT(8),
437 };
438
439 static u16 hpx3_device_type(struct pci_dev *dev)
440 {
441 u16 pcie_type = pci_pcie_type(dev);
442 static const int pcie_to_hpx3_type[] = {
443 [PCI_EXP_TYPE_ENDPOINT] = HPX_TYPE_ENDPOINT,
444 [PCI_EXP_TYPE_LEG_END] = HPX_TYPE_LEG_END,
445 [PCI_EXP_TYPE_RC_END] = HPX_TYPE_RC_END,
446 [PCI_EXP_TYPE_RC_EC] = HPX_TYPE_RC_EC,
447 [PCI_EXP_TYPE_ROOT_PORT] = HPX_TYPE_ROOT_PORT,
448 [PCI_EXP_TYPE_UPSTREAM] = HPX_TYPE_UPSTREAM,
449 [PCI_EXP_TYPE_DOWNSTREAM] = HPX_TYPE_DOWNSTREAM,
450 [PCI_EXP_TYPE_PCI_BRIDGE] = HPX_TYPE_PCI_BRIDGE,
451 [PCI_EXP_TYPE_PCIE_BRIDGE] = HPX_TYPE_PCIE_BRIDGE,
452 };
453
454 if (pcie_type >= ARRAY_SIZE(pcie_to_hpx3_type))
455 return 0;
456
457 return pcie_to_hpx3_type[pcie_type];
458 }
459
460 enum hpx_type3_fn_type {
461 HPX_FN_NORMAL = BIT(0),
462 HPX_FN_SRIOV_PHYS = BIT(1),
463 HPX_FN_SRIOV_VIRT = BIT(2),
464 };
465
466 static u8 hpx3_function_type(struct pci_dev *dev)
467 {
468 if (dev->is_virtfn)
469 return HPX_FN_SRIOV_VIRT;
470 else if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV) > 0)
471 return HPX_FN_SRIOV_PHYS;
472 else
473 return HPX_FN_NORMAL;
474 }
475
476 static bool hpx3_cap_ver_matches(u8 pcie_cap_id, u8 hpx3_cap_id)
477 {
478 u8 cap_ver = hpx3_cap_id & 0xf;
479
480 if ((hpx3_cap_id & BIT(4)) && cap_ver >= pcie_cap_id)
481 return true;
482 else if (cap_ver == pcie_cap_id)
483 return true;
484
485 return false;
486 }
487
488 enum hpx_type3_cfg_loc {
489 HPX_CFG_PCICFG = 0,
490 HPX_CFG_PCIE_CAP = 1,
491 HPX_CFG_PCIE_CAP_EXT = 2,
492 HPX_CFG_VEND_CAP = 3,
493 HPX_CFG_DVSEC = 4,
494 HPX_CFG_MAX,
495 };
496
497 static void program_hpx_type3_register(struct pci_dev *dev,
498 const struct hpx_type3 *reg)
499 {
500 u32 match_reg, write_reg, header, orig_value;
501 u16 pos;
502
503 if (!(hpx3_device_type(dev) & reg->device_type))
504 return;
505
506 if (!(hpx3_function_type(dev) & reg->function_type))
507 return;
508
509 switch (reg->config_space_location) {
510 case HPX_CFG_PCICFG:
511 pos = 0;
512 break;
513 case HPX_CFG_PCIE_CAP:
514 pos = pci_find_capability(dev, reg->pci_exp_cap_id);
515 if (pos == 0)
516 return;
517
518 break;
519 case HPX_CFG_PCIE_CAP_EXT:
520 pos = pci_find_ext_capability(dev, reg->pci_exp_cap_id);
521 if (pos == 0)
522 return;
523
524 pci_read_config_dword(dev, pos, &header);
525 if (!hpx3_cap_ver_matches(PCI_EXT_CAP_VER(header),
526 reg->pci_exp_cap_ver))
527 return;
528
529 break;
530 case HPX_CFG_VEND_CAP: /* Fall through */
531 case HPX_CFG_DVSEC: /* Fall through */
532 default:
533 pci_warn(dev, "Encountered _HPX type 3 with unsupported config space location");
534 return;
535 }
536
537 pci_read_config_dword(dev, pos + reg->match_offset, &match_reg);
538
539 if ((match_reg & reg->match_mask_and) != reg->match_value)
540 return;
541
542 pci_read_config_dword(dev, pos + reg->reg_offset, &write_reg);
543 orig_value = write_reg;
544 write_reg &= reg->reg_mask_and;
545 write_reg |= reg->reg_mask_or;
546
547 if (orig_value == write_reg)
548 return;
549
550 pci_write_config_dword(dev, pos + reg->reg_offset, write_reg);
551
552 pci_dbg(dev, "Applied _HPX3 at [0x%x]: 0x%08x -> 0x%08x",
553 pos, orig_value, write_reg);
554 }
555
556 static void program_hpx_type3(struct pci_dev *dev, struct hpx_type3 *hpx)
557 {
558 if (!hpx)
559 return;
560
561 if (!pci_is_pcie(dev))
562 return;
563
564 program_hpx_type3_register(dev, hpx);
565 }
566
567 static void parse_hpx3_register(struct hpx_type3 *hpx3_reg,
568 union acpi_object *reg_fields)
569 {
570 hpx3_reg->device_type = reg_fields[0].integer.value;
571 hpx3_reg->function_type = reg_fields[1].integer.value;
572 hpx3_reg->config_space_location = reg_fields[2].integer.value;
573 hpx3_reg->pci_exp_cap_id = reg_fields[3].integer.value;
574 hpx3_reg->pci_exp_cap_ver = reg_fields[4].integer.value;
575 hpx3_reg->pci_exp_vendor_id = reg_fields[5].integer.value;
576 hpx3_reg->dvsec_id = reg_fields[6].integer.value;
577 hpx3_reg->dvsec_rev = reg_fields[7].integer.value;
578 hpx3_reg->match_offset = reg_fields[8].integer.value;
579 hpx3_reg->match_mask_and = reg_fields[9].integer.value;
580 hpx3_reg->match_value = reg_fields[10].integer.value;
581 hpx3_reg->reg_offset = reg_fields[11].integer.value;
582 hpx3_reg->reg_mask_and = reg_fields[12].integer.value;
583 hpx3_reg->reg_mask_or = reg_fields[13].integer.value;
584 }
585
586 static acpi_status program_type3_hpx_record(struct pci_dev *dev,
587 union acpi_object *record)
588 {
589 union acpi_object *fields = record->package.elements;
590 u32 desc_count, expected_length, revision;
591 union acpi_object *reg_fields;
592 struct hpx_type3 hpx3;
593 int i;
594
595 revision = fields[1].integer.value;
596 switch (revision) {
597 case 1:
598 desc_count = fields[2].integer.value;
599 expected_length = 3 + desc_count * 14;
600
601 if (record->package.count != expected_length)
602 return AE_ERROR;
603
604 for (i = 2; i < expected_length; i++)
605 if (fields[i].type != ACPI_TYPE_INTEGER)
606 return AE_ERROR;
607
608 for (i = 0; i < desc_count; i++) {
609 reg_fields = fields + 3 + i * 14;
610 parse_hpx3_register(&hpx3, reg_fields);
611 program_hpx_type3(dev, &hpx3);
612 }
613
614 break;
615 default:
616 printk(KERN_WARNING
617 "%s: Type 3 Revision %d record not supported\n",
618 __func__, revision);
619 return AE_ERROR;
620 }
621 return AE_OK;
622 }
623
624 static acpi_status acpi_run_hpx(struct pci_dev *dev, acpi_handle handle)
625 {
626 acpi_status status;
627 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
628 union acpi_object *package, *record, *fields;
629 struct hpx_type0 hpx0;
630 struct hpx_type1 hpx1;
631 struct hpx_type2 hpx2;
632 u32 type;
633 int i;
634
635 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
636 if (ACPI_FAILURE(status))
637 return status;
638
639 package = (union acpi_object *)buffer.pointer;
640 if (package->type != ACPI_TYPE_PACKAGE) {
641 status = AE_ERROR;
642 goto exit;
643 }
644
645 for (i = 0; i < package->package.count; i++) {
646 record = &package->package.elements[i];
647 if (record->type != ACPI_TYPE_PACKAGE) {
648 status = AE_ERROR;
649 goto exit;
650 }
651
652 fields = record->package.elements;
653 if (fields[0].type != ACPI_TYPE_INTEGER ||
654 fields[1].type != ACPI_TYPE_INTEGER) {
655 status = AE_ERROR;
656 goto exit;
657 }
658
659 type = fields[0].integer.value;
660 switch (type) {
661 case 0:
662 memset(&hpx0, 0, sizeof(hpx0));
663 status = decode_type0_hpx_record(record, &hpx0);
664 if (ACPI_FAILURE(status))
665 goto exit;
666 program_hpx_type0(dev, &hpx0);
667 break;
668 case 1:
669 memset(&hpx1, 0, sizeof(hpx1));
670 status = decode_type1_hpx_record(record, &hpx1);
671 if (ACPI_FAILURE(status))
672 goto exit;
673 program_hpx_type1(dev, &hpx1);
674 break;
675 case 2:
676 memset(&hpx2, 0, sizeof(hpx2));
677 status = decode_type2_hpx_record(record, &hpx2);
678 if (ACPI_FAILURE(status))
679 goto exit;
680 program_hpx_type2(dev, &hpx2);
681 break;
682 case 3:
683 status = program_type3_hpx_record(dev, record);
684 if (ACPI_FAILURE(status))
685 goto exit;
686 break;
687 default:
688 pr_err("%s: Type %d record not supported\n",
689 __func__, type);
690 status = AE_ERROR;
691 goto exit;
692 }
693 }
694 exit:
695 kfree(buffer.pointer);
696 return status;
697 }
698
699 static acpi_status acpi_run_hpp(struct pci_dev *dev, acpi_handle handle)
700 {
701 acpi_status status;
702 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
703 union acpi_object *package, *fields;
704 struct hpx_type0 hpx0;
705 int i;
706
707 memset(&hpx0, 0, sizeof(hpx0));
708
709 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
710 if (ACPI_FAILURE(status))
711 return status;
712
713 package = (union acpi_object *) buffer.pointer;
714 if (package->type != ACPI_TYPE_PACKAGE ||
715 package->package.count != 4) {
716 status = AE_ERROR;
717 goto exit;
718 }
719
720 fields = package->package.elements;
721 for (i = 0; i < 4; i++) {
722 if (fields[i].type != ACPI_TYPE_INTEGER) {
723 status = AE_ERROR;
724 goto exit;
725 }
726 }
727
728 hpx0.revision = 1;
729 hpx0.cache_line_size = fields[0].integer.value;
730 hpx0.latency_timer = fields[1].integer.value;
731 hpx0.enable_serr = fields[2].integer.value;
732 hpx0.enable_perr = fields[3].integer.value;
733
734 program_hpx_type0(dev, &hpx0);
735
736 exit:
737 kfree(buffer.pointer);
738 return status;
739 }
740
741 /* pci_acpi_program_hp_params
742 *
743 * @dev - the pci_dev for which we want parameters
744 */
745 int pci_acpi_program_hp_params(struct pci_dev *dev)
746 {
747 acpi_status status;
748 acpi_handle handle, phandle;
749 struct pci_bus *pbus;
750
751 if (acpi_pci_disabled)
752 return -ENODEV;
753
754 handle = NULL;
755 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
756 handle = acpi_pci_get_bridge_handle(pbus);
757 if (handle)
758 break;
759 }
760
761 /*
762 * _HPP settings apply to all child buses, until another _HPP is
763 * encountered. If we don't find an _HPP for the input pci dev,
764 * look for it in the parent device scope since that would apply to
765 * this pci dev.
766 */
767 while (handle) {
768 status = acpi_run_hpx(dev, handle);
769 if (ACPI_SUCCESS(status))
770 return 0;
771 status = acpi_run_hpp(dev, handle);
772 if (ACPI_SUCCESS(status))
773 return 0;
774 if (acpi_is_root_bridge(handle))
775 break;
776 status = acpi_get_parent(handle, &phandle);
777 if (ACPI_FAILURE(status))
778 break;
779 handle = phandle;
780 }
781 return -ENODEV;
782 }
783
784 /**
785 * pciehp_is_native - Check whether a hotplug port is handled by the OS
786 * @bridge: Hotplug port to check
787 *
788 * Returns true if the given @bridge is handled by the native PCIe hotplug
789 * driver.
790 */
791 bool pciehp_is_native(struct pci_dev *bridge)
792 {
793 const struct pci_host_bridge *host;
794 u32 slot_cap;
795
796 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
797 return false;
798
799 pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
800 if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
801 return false;
802
803 if (pcie_ports_native)
804 return true;
805
806 host = pci_find_host_bridge(bridge->bus);
807 return host->native_pcie_hotplug;
808 }
809
810 /**
811 * shpchp_is_native - Check whether a hotplug port is handled by the OS
812 * @bridge: Hotplug port to check
813 *
814 * Returns true if the given @bridge is handled by the native SHPC hotplug
815 * driver.
816 */
817 bool shpchp_is_native(struct pci_dev *bridge)
818 {
819 return bridge->shpc_managed;
820 }
821
822 /**
823 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
824 * @context: Device wakeup context.
825 */
826 static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
827 {
828 struct acpi_device *adev;
829 struct acpi_pci_root *root;
830
831 adev = container_of(context, struct acpi_device, wakeup.context);
832 root = acpi_driver_data(adev);
833 pci_pme_wakeup_bus(root->bus);
834 }
835
836 /**
837 * pci_acpi_wake_dev - PCI device wakeup notification work function.
838 * @context: Device wakeup context.
839 */
840 static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
841 {
842 struct pci_dev *pci_dev;
843
844 pci_dev = to_pci_dev(context->dev);
845
846 if (pci_dev->pme_poll)
847 pci_dev->pme_poll = false;
848
849 if (pci_dev->current_state == PCI_D3cold) {
850 pci_wakeup_event(pci_dev);
851 pm_request_resume(&pci_dev->dev);
852 return;
853 }
854
855 /* Clear PME Status if set. */
856 if (pci_dev->pme_support)
857 pci_check_pme_status(pci_dev);
858
859 pci_wakeup_event(pci_dev);
860 pm_request_resume(&pci_dev->dev);
861
862 pci_pme_wakeup_bus(pci_dev->subordinate);
863 }
864
865 /**
866 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
867 * @dev: PCI root bridge ACPI device.
868 */
869 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
870 {
871 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
872 }
873
874 /**
875 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
876 * @dev: ACPI device to add the notifier for.
877 * @pci_dev: PCI device to check for the PME status if an event is signaled.
878 */
879 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
880 struct pci_dev *pci_dev)
881 {
882 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
883 }
884
885 /*
886 * _SxD returns the D-state with the highest power
887 * (lowest D-state number) supported in the S-state "x".
888 *
889 * If the devices does not have a _PRW
890 * (Power Resources for Wake) supporting system wakeup from "x"
891 * then the OS is free to choose a lower power (higher number
892 * D-state) than the return value from _SxD.
893 *
894 * But if _PRW is enabled at S-state "x", the OS
895 * must not choose a power lower than _SxD --
896 * unless the device has an _SxW method specifying
897 * the lowest power (highest D-state number) the device
898 * may enter while still able to wake the system.
899 *
900 * ie. depending on global OS policy:
901 *
902 * if (_PRW at S-state x)
903 * choose from highest power _SxD to lowest power _SxW
904 * else // no _PRW at S-state x
905 * choose highest power _SxD or any lower power
906 */
907
908 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
909 {
910 int acpi_state, d_max;
911
912 if (pdev->no_d3cold)
913 d_max = ACPI_STATE_D3_HOT;
914 else
915 d_max = ACPI_STATE_D3_COLD;
916 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
917 if (acpi_state < 0)
918 return PCI_POWER_ERROR;
919
920 switch (acpi_state) {
921 case ACPI_STATE_D0:
922 return PCI_D0;
923 case ACPI_STATE_D1:
924 return PCI_D1;
925 case ACPI_STATE_D2:
926 return PCI_D2;
927 case ACPI_STATE_D3_HOT:
928 return PCI_D3hot;
929 case ACPI_STATE_D3_COLD:
930 return PCI_D3cold;
931 }
932 return PCI_POWER_ERROR;
933 }
934
935 static struct acpi_device *acpi_pci_find_companion(struct device *dev);
936
937 static bool acpi_pci_bridge_d3(struct pci_dev *dev)
938 {
939 const struct fwnode_handle *fwnode;
940 struct acpi_device *adev;
941 struct pci_dev *root;
942 u8 val;
943
944 if (!dev->is_hotplug_bridge)
945 return false;
946
947 /*
948 * Look for a special _DSD property for the root port and if it
949 * is set we know the hierarchy behind it supports D3 just fine.
950 */
951 root = pci_find_pcie_root_port(dev);
952 if (!root)
953 return false;
954
955 adev = ACPI_COMPANION(&root->dev);
956 if (root == dev) {
957 /*
958 * It is possible that the ACPI companion is not yet bound
959 * for the root port so look it up manually here.
960 */
961 if (!adev && !pci_dev_is_added(root))
962 adev = acpi_pci_find_companion(&root->dev);
963 }
964
965 if (!adev)
966 return false;
967
968 fwnode = acpi_fwnode_handle(adev);
969 if (fwnode_property_read_u8(fwnode, "HotPlugSupportInD3", &val))
970 return false;
971
972 return val == 1;
973 }
974
975 static bool acpi_pci_power_manageable(struct pci_dev *dev)
976 {
977 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
978 return adev ? acpi_device_power_manageable(adev) : false;
979 }
980
981 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
982 {
983 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
984 static const u8 state_conv[] = {
985 [PCI_D0] = ACPI_STATE_D0,
986 [PCI_D1] = ACPI_STATE_D1,
987 [PCI_D2] = ACPI_STATE_D2,
988 [PCI_D3hot] = ACPI_STATE_D3_HOT,
989 [PCI_D3cold] = ACPI_STATE_D3_COLD,
990 };
991 int error = -EINVAL;
992
993 /* If the ACPI device has _EJ0, ignore the device */
994 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
995 return -ENODEV;
996
997 switch (state) {
998 case PCI_D3cold:
999 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
1000 PM_QOS_FLAGS_ALL) {
1001 error = -EBUSY;
1002 break;
1003 }
1004 /* Fall through */
1005 case PCI_D0:
1006 case PCI_D1:
1007 case PCI_D2:
1008 case PCI_D3hot:
1009 error = acpi_device_set_power(adev, state_conv[state]);
1010 }
1011
1012 if (!error)
1013 pci_dbg(dev, "power state changed by ACPI to %s\n",
1014 acpi_power_state_string(state_conv[state]));
1015
1016 return error;
1017 }
1018
1019 static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
1020 {
1021 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1022 static const pci_power_t state_conv[] = {
1023 [ACPI_STATE_D0] = PCI_D0,
1024 [ACPI_STATE_D1] = PCI_D1,
1025 [ACPI_STATE_D2] = PCI_D2,
1026 [ACPI_STATE_D3_HOT] = PCI_D3hot,
1027 [ACPI_STATE_D3_COLD] = PCI_D3cold,
1028 };
1029 int state;
1030
1031 if (!adev || !acpi_device_power_manageable(adev))
1032 return PCI_UNKNOWN;
1033
1034 state = adev->power.state;
1035 if (state == ACPI_STATE_UNKNOWN)
1036 return PCI_UNKNOWN;
1037
1038 return state_conv[state];
1039 }
1040
1041 static void acpi_pci_refresh_power_state(struct pci_dev *dev)
1042 {
1043 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1044
1045 if (adev && acpi_device_power_manageable(adev))
1046 acpi_device_update_power(adev, NULL);
1047 }
1048
1049 static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
1050 {
1051 while (bus->parent) {
1052 if (acpi_pm_device_can_wakeup(&bus->self->dev))
1053 return acpi_pm_set_bridge_wakeup(&bus->self->dev, enable);
1054
1055 bus = bus->parent;
1056 }
1057
1058 /* We have reached the root bus. */
1059 if (bus->bridge) {
1060 if (acpi_pm_device_can_wakeup(bus->bridge))
1061 return acpi_pm_set_bridge_wakeup(bus->bridge, enable);
1062 }
1063 return 0;
1064 }
1065
1066 static int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
1067 {
1068 if (acpi_pm_device_can_wakeup(&dev->dev))
1069 return acpi_pm_set_device_wakeup(&dev->dev, enable);
1070
1071 return acpi_pci_propagate_wakeup(dev->bus, enable);
1072 }
1073
1074 static bool acpi_pci_need_resume(struct pci_dev *dev)
1075 {
1076 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1077
1078 /*
1079 * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
1080 * system-wide suspend/resume confuses the platform firmware, so avoid
1081 * doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
1082 * devices are expected to be in D3 before invoking the S3 entry path
1083 * from the firmware, so they should not be affected by this issue.
1084 */
1085 if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
1086 return true;
1087
1088 if (!adev || !acpi_device_power_manageable(adev))
1089 return false;
1090
1091 if (adev->wakeup.flags.valid &&
1092 device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
1093 return true;
1094
1095 if (acpi_target_system_state() == ACPI_STATE_S0)
1096 return false;
1097
1098 return !!adev->power.flags.dsw_present;
1099 }
1100
1101 static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
1102 .bridge_d3 = acpi_pci_bridge_d3,
1103 .is_manageable = acpi_pci_power_manageable,
1104 .set_state = acpi_pci_set_power_state,
1105 .get_state = acpi_pci_get_power_state,
1106 .refresh_state = acpi_pci_refresh_power_state,
1107 .choose_state = acpi_pci_choose_state,
1108 .set_wakeup = acpi_pci_wakeup,
1109 .need_resume = acpi_pci_need_resume,
1110 };
1111
1112 void acpi_pci_add_bus(struct pci_bus *bus)
1113 {
1114 union acpi_object *obj;
1115 struct pci_host_bridge *bridge;
1116
1117 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
1118 return;
1119
1120 acpi_pci_slot_enumerate(bus);
1121 acpiphp_enumerate_slots(bus);
1122
1123 /*
1124 * For a host bridge, check its _DSM for function 8 and if
1125 * that is available, mark it in pci_host_bridge.
1126 */
1127 if (!pci_is_root_bus(bus))
1128 return;
1129
1130 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
1131 RESET_DELAY_DSM, NULL);
1132 if (!obj)
1133 return;
1134
1135 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
1136 bridge = pci_find_host_bridge(bus);
1137 bridge->ignore_reset_delay = 1;
1138 }
1139 ACPI_FREE(obj);
1140 }
1141
1142 void acpi_pci_remove_bus(struct pci_bus *bus)
1143 {
1144 if (acpi_pci_disabled || !bus->bridge)
1145 return;
1146
1147 acpiphp_remove_slots(bus);
1148 acpi_pci_slot_remove(bus);
1149 }
1150
1151 /* ACPI bus type */
1152 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
1153 {
1154 struct pci_dev *pci_dev = to_pci_dev(dev);
1155 bool check_children;
1156 u64 addr;
1157
1158 check_children = pci_is_bridge(pci_dev);
1159 /* Please ref to ACPI spec for the syntax of _ADR */
1160 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
1161 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
1162 check_children);
1163 }
1164
1165 /**
1166 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
1167 * @pdev: the PCI device whose delay is to be updated
1168 * @handle: ACPI handle of this device
1169 *
1170 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
1171 * control method of either the device itself or the PCI host bridge.
1172 *
1173 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
1174 * host bridge. If it returns one, the OS may assume that all devices in
1175 * the hierarchy have already completed power-on reset delays.
1176 *
1177 * Function 9, "Device Readiness Durations," applies only to the object
1178 * where it is located. It returns delay durations required after various
1179 * events if the device requires less time than the spec requires. Delays
1180 * from this function take precedence over the Reset Delay function.
1181 *
1182 * These _DSM functions are defined by the draft ECN of January 28, 2014,
1183 * titled "ACPI additions for FW latency optimizations."
1184 */
1185 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
1186 acpi_handle handle)
1187 {
1188 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
1189 int value;
1190 union acpi_object *obj, *elements;
1191
1192 if (bridge->ignore_reset_delay)
1193 pdev->d3cold_delay = 0;
1194
1195 obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
1196 FUNCTION_DELAY_DSM, NULL);
1197 if (!obj)
1198 return;
1199
1200 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
1201 elements = obj->package.elements;
1202 if (elements[0].type == ACPI_TYPE_INTEGER) {
1203 value = (int)elements[0].integer.value / 1000;
1204 if (value < PCI_PM_D3COLD_WAIT)
1205 pdev->d3cold_delay = value;
1206 }
1207 if (elements[3].type == ACPI_TYPE_INTEGER) {
1208 value = (int)elements[3].integer.value / 1000;
1209 if (value < PCI_PM_D3_WAIT)
1210 pdev->d3_delay = value;
1211 }
1212 }
1213 ACPI_FREE(obj);
1214 }
1215
1216 static void pci_acpi_set_untrusted(struct pci_dev *dev)
1217 {
1218 u8 val;
1219
1220 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1221 return;
1222 if (device_property_read_u8(&dev->dev, "ExternalFacingPort", &val))
1223 return;
1224
1225 /*
1226 * These root ports expose PCIe (including DMA) outside of the
1227 * system so make sure we treat them and everything behind as
1228 * untrusted.
1229 */
1230 if (val)
1231 dev->untrusted = 1;
1232 }
1233
1234 static void pci_acpi_setup(struct device *dev)
1235 {
1236 struct pci_dev *pci_dev = to_pci_dev(dev);
1237 struct acpi_device *adev = ACPI_COMPANION(dev);
1238
1239 if (!adev)
1240 return;
1241
1242 pci_acpi_optimize_delay(pci_dev, adev->handle);
1243 pci_acpi_set_untrusted(pci_dev);
1244 pci_acpi_add_edr_notifier(pci_dev);
1245
1246 pci_acpi_add_pm_notifier(adev, pci_dev);
1247 if (!adev->wakeup.flags.valid)
1248 return;
1249
1250 device_set_wakeup_capable(dev, true);
1251 /*
1252 * For bridges that can do D3 we enable wake automatically (as
1253 * we do for the power management itself in that case). The
1254 * reason is that the bridge may have additional methods such as
1255 * _DSW that need to be called.
1256 */
1257 if (pci_dev->bridge_d3)
1258 device_wakeup_enable(dev);
1259
1260 acpi_pci_wakeup(pci_dev, false);
1261 acpi_device_power_add_dependent(adev, dev);
1262 }
1263
1264 static void pci_acpi_cleanup(struct device *dev)
1265 {
1266 struct acpi_device *adev = ACPI_COMPANION(dev);
1267 struct pci_dev *pci_dev = to_pci_dev(dev);
1268
1269 if (!adev)
1270 return;
1271
1272 pci_acpi_remove_edr_notifier(pci_dev);
1273 pci_acpi_remove_pm_notifier(adev);
1274 if (adev->wakeup.flags.valid) {
1275 acpi_device_power_remove_dependent(adev, dev);
1276 if (pci_dev->bridge_d3)
1277 device_wakeup_disable(dev);
1278
1279 device_set_wakeup_capable(dev, false);
1280 }
1281 }
1282
1283 static bool pci_acpi_bus_match(struct device *dev)
1284 {
1285 return dev_is_pci(dev);
1286 }
1287
1288 static struct acpi_bus_type acpi_pci_bus = {
1289 .name = "PCI",
1290 .match = pci_acpi_bus_match,
1291 .find_companion = acpi_pci_find_companion,
1292 .setup = pci_acpi_setup,
1293 .cleanup = pci_acpi_cleanup,
1294 };
1295
1296
1297 static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
1298
1299 /**
1300 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
1301 * @fn: Callback matching a device to a fwnode that identifies a PCI
1302 * MSI domain.
1303 *
1304 * This should be called by irqchip driver, which is the parent of
1305 * the MSI domain to provide callback interface to query fwnode.
1306 */
1307 void
1308 pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
1309 {
1310 pci_msi_get_fwnode_cb = fn;
1311 }
1312
1313 /**
1314 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
1315 * @bus: The PCI host bridge bus.
1316 *
1317 * This function uses the callback function registered by
1318 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
1319 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
1320 * This returns NULL on error or when the domain is not found.
1321 */
1322 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
1323 {
1324 struct fwnode_handle *fwnode;
1325
1326 if (!pci_msi_get_fwnode_cb)
1327 return NULL;
1328
1329 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
1330 if (!fwnode)
1331 return NULL;
1332
1333 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
1334 }
1335
1336 static int __init acpi_pci_init(void)
1337 {
1338 int ret;
1339
1340 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
1341 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
1342 pci_no_msi();
1343 }
1344
1345 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
1346 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
1347 pcie_no_aspm();
1348 }
1349
1350 ret = register_acpi_bus_type(&acpi_pci_bus);
1351 if (ret)
1352 return 0;
1353
1354 pci_set_platform_pm(&acpi_pci_platform_pm);
1355 acpi_pci_slot_init();
1356 acpiphp_init();
1357
1358 return 0;
1359 }
1360 arch_initcall(acpi_pci_init);
Linux with added FPC-III support