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 <linux/rwsem.h>
21 #include "pci.h"
22
23 /*
24 * The GUID is defined in the PCI Firmware Specification available
25 * here to PCI-SIG members:
26 * https://members.pcisig.com/wg/PCI-SIG/document/15350
27 */
28 const guid_t pci_acpi_dsm_guid =
29 GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
30 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
31
32 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
acpi_get_rc_addr(struct acpi_device * adev,struct resource * res)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
acpi_match_rc(acpi_handle handle,u32 lvl,void * context,void ** retval)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
acpi_get_rc_resources(struct device * dev,const char * hid,u16 segment,struct resource * res)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 adev = acpi_fetch_acpi_dev(handle);
94 if (!adev)
95 return -ENODEV;
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
acpi_pci_root_get_mcfg_addr(acpi_handle handle)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
122 /* _HPX PCI Setting Record (Type 0); same as _HPP */
123 struct hpx_type0 {
124 u32 revision; /* Not present in _HPP */
125 u8 cache_line_size; /* Not applicable to PCIe */
126 u8 latency_timer; /* Not applicable to PCIe */
127 u8 enable_serr;
128 u8 enable_perr;
129 };
130
131 static struct hpx_type0 pci_default_type0 = {
132 .revision = 1,
133 .cache_line_size = 8,
134 .latency_timer = 0x40,
135 .enable_serr = 0,
136 .enable_perr = 0,
137 };
138
program_hpx_type0(struct pci_dev * dev,struct hpx_type0 * hpx)139 static void program_hpx_type0(struct pci_dev *dev, struct hpx_type0 *hpx)
140 {
141 u16 pci_cmd, pci_bctl;
142
143 if (!hpx)
144 hpx = &pci_default_type0;
145
146 if (hpx->revision > 1) {
147 pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
148 hpx->revision);
149 hpx = &pci_default_type0;
150 }
151
152 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpx->cache_line_size);
153 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpx->latency_timer);
154 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
155 if (hpx->enable_serr)
156 pci_cmd |= PCI_COMMAND_SERR;
157 if (hpx->enable_perr)
158 pci_cmd |= PCI_COMMAND_PARITY;
159 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
160
161 /* Program bridge control value */
162 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
163 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
164 hpx->latency_timer);
165 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
166 if (hpx->enable_perr)
167 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
168 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
169 }
170 }
171
decode_type0_hpx_record(union acpi_object * record,struct hpx_type0 * hpx0)172 static acpi_status decode_type0_hpx_record(union acpi_object *record,
173 struct hpx_type0 *hpx0)
174 {
175 int i;
176 union acpi_object *fields = record->package.elements;
177 u32 revision = fields[1].integer.value;
178
179 switch (revision) {
180 case 1:
181 if (record->package.count != 6)
182 return AE_ERROR;
183 for (i = 2; i < 6; i++)
184 if (fields[i].type != ACPI_TYPE_INTEGER)
185 return AE_ERROR;
186 hpx0->revision = revision;
187 hpx0->cache_line_size = fields[2].integer.value;
188 hpx0->latency_timer = fields[3].integer.value;
189 hpx0->enable_serr = fields[4].integer.value;
190 hpx0->enable_perr = fields[5].integer.value;
191 break;
192 default:
193 pr_warn("%s: Type 0 Revision %d record not supported\n",
194 __func__, revision);
195 return AE_ERROR;
196 }
197 return AE_OK;
198 }
199
200 /* _HPX PCI-X Setting Record (Type 1) */
201 struct hpx_type1 {
202 u32 revision;
203 u8 max_mem_read;
204 u8 avg_max_split;
205 u16 tot_max_split;
206 };
207
program_hpx_type1(struct pci_dev * dev,struct hpx_type1 * hpx)208 static void program_hpx_type1(struct pci_dev *dev, struct hpx_type1 *hpx)
209 {
210 int pos;
211
212 if (!hpx)
213 return;
214
215 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
216 if (!pos)
217 return;
218
219 pci_warn(dev, "PCI-X settings not supported\n");
220 }
221
decode_type1_hpx_record(union acpi_object * record,struct hpx_type1 * hpx1)222 static acpi_status decode_type1_hpx_record(union acpi_object *record,
223 struct hpx_type1 *hpx1)
224 {
225 int i;
226 union acpi_object *fields = record->package.elements;
227 u32 revision = fields[1].integer.value;
228
229 switch (revision) {
230 case 1:
231 if (record->package.count != 5)
232 return AE_ERROR;
233 for (i = 2; i < 5; i++)
234 if (fields[i].type != ACPI_TYPE_INTEGER)
235 return AE_ERROR;
236 hpx1->revision = revision;
237 hpx1->max_mem_read = fields[2].integer.value;
238 hpx1->avg_max_split = fields[3].integer.value;
239 hpx1->tot_max_split = fields[4].integer.value;
240 break;
241 default:
242 pr_warn("%s: Type 1 Revision %d record not supported\n",
243 __func__, revision);
244 return AE_ERROR;
245 }
246 return AE_OK;
247 }
248
pcie_root_rcb_set(struct pci_dev * dev)249 static bool pcie_root_rcb_set(struct pci_dev *dev)
250 {
251 struct pci_dev *rp = pcie_find_root_port(dev);
252 u16 lnkctl;
253
254 if (!rp)
255 return false;
256
257 pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
258 if (lnkctl & PCI_EXP_LNKCTL_RCB)
259 return true;
260
261 return false;
262 }
263
264 /* _HPX PCI Express Setting Record (Type 2) */
265 struct hpx_type2 {
266 u32 revision;
267 u32 unc_err_mask_and;
268 u32 unc_err_mask_or;
269 u32 unc_err_sever_and;
270 u32 unc_err_sever_or;
271 u32 cor_err_mask_and;
272 u32 cor_err_mask_or;
273 u32 adv_err_cap_and;
274 u32 adv_err_cap_or;
275 u16 pci_exp_devctl_and;
276 u16 pci_exp_devctl_or;
277 u16 pci_exp_lnkctl_and;
278 u16 pci_exp_lnkctl_or;
279 u32 sec_unc_err_sever_and;
280 u32 sec_unc_err_sever_or;
281 u32 sec_unc_err_mask_and;
282 u32 sec_unc_err_mask_or;
283 };
284
program_hpx_type2(struct pci_dev * dev,struct hpx_type2 * hpx)285 static void program_hpx_type2(struct pci_dev *dev, struct hpx_type2 *hpx)
286 {
287 int pos;
288 u32 reg32;
289
290 if (!hpx)
291 return;
292
293 if (!pci_is_pcie(dev))
294 return;
295
296 if (hpx->revision > 1) {
297 pci_warn(dev, "PCIe settings rev %d not supported\n",
298 hpx->revision);
299 return;
300 }
301
302 /*
303 * Don't allow _HPX to change MPS or MRRS settings. We manage
304 * those to make sure they're consistent with the rest of the
305 * platform.
306 */
307 hpx->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
308 PCI_EXP_DEVCTL_READRQ;
309 hpx->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
310 PCI_EXP_DEVCTL_READRQ);
311
312 /* Initialize Device Control Register */
313 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
314 ~hpx->pci_exp_devctl_and, hpx->pci_exp_devctl_or);
315
316 /* Initialize Link Control Register */
317 if (pcie_cap_has_lnkctl(dev)) {
318
319 /*
320 * If the Root Port supports Read Completion Boundary of
321 * 128, set RCB to 128. Otherwise, clear it.
322 */
323 hpx->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
324 hpx->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
325 if (pcie_root_rcb_set(dev))
326 hpx->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
327
328 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
329 ~hpx->pci_exp_lnkctl_and, hpx->pci_exp_lnkctl_or);
330 }
331
332 /* Find Advanced Error Reporting Enhanced Capability */
333 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
334 if (!pos)
335 return;
336
337 /* Initialize Uncorrectable Error Mask Register */
338 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
339 reg32 = (reg32 & hpx->unc_err_mask_and) | hpx->unc_err_mask_or;
340 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
341
342 /* Initialize Uncorrectable Error Severity Register */
343 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
344 reg32 = (reg32 & hpx->unc_err_sever_and) | hpx->unc_err_sever_or;
345 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
346
347 /* Initialize Correctable Error Mask Register */
348 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
349 reg32 = (reg32 & hpx->cor_err_mask_and) | hpx->cor_err_mask_or;
350 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
351
352 /* Initialize Advanced Error Capabilities and Control Register */
353 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
354 reg32 = (reg32 & hpx->adv_err_cap_and) | hpx->adv_err_cap_or;
355
356 /* Don't enable ECRC generation or checking if unsupported */
357 if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
358 reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
359 if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
360 reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
361 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
362
363 /*
364 * FIXME: The following two registers are not supported yet.
365 *
366 * o Secondary Uncorrectable Error Severity Register
367 * o Secondary Uncorrectable Error Mask Register
368 */
369 }
370
decode_type2_hpx_record(union acpi_object * record,struct hpx_type2 * hpx2)371 static acpi_status decode_type2_hpx_record(union acpi_object *record,
372 struct hpx_type2 *hpx2)
373 {
374 int i;
375 union acpi_object *fields = record->package.elements;
376 u32 revision = fields[1].integer.value;
377
378 switch (revision) {
379 case 1:
380 if (record->package.count != 18)
381 return AE_ERROR;
382 for (i = 2; i < 18; i++)
383 if (fields[i].type != ACPI_TYPE_INTEGER)
384 return AE_ERROR;
385 hpx2->revision = revision;
386 hpx2->unc_err_mask_and = fields[2].integer.value;
387 hpx2->unc_err_mask_or = fields[3].integer.value;
388 hpx2->unc_err_sever_and = fields[4].integer.value;
389 hpx2->unc_err_sever_or = fields[5].integer.value;
390 hpx2->cor_err_mask_and = fields[6].integer.value;
391 hpx2->cor_err_mask_or = fields[7].integer.value;
392 hpx2->adv_err_cap_and = fields[8].integer.value;
393 hpx2->adv_err_cap_or = fields[9].integer.value;
394 hpx2->pci_exp_devctl_and = fields[10].integer.value;
395 hpx2->pci_exp_devctl_or = fields[11].integer.value;
396 hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
397 hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
398 hpx2->sec_unc_err_sever_and = fields[14].integer.value;
399 hpx2->sec_unc_err_sever_or = fields[15].integer.value;
400 hpx2->sec_unc_err_mask_and = fields[16].integer.value;
401 hpx2->sec_unc_err_mask_or = fields[17].integer.value;
402 break;
403 default:
404 pr_warn("%s: Type 2 Revision %d record not supported\n",
405 __func__, revision);
406 return AE_ERROR;
407 }
408 return AE_OK;
409 }
410
411 /* _HPX PCI Express Setting Record (Type 3) */
412 struct hpx_type3 {
413 u16 device_type;
414 u16 function_type;
415 u16 config_space_location;
416 u16 pci_exp_cap_id;
417 u16 pci_exp_cap_ver;
418 u16 pci_exp_vendor_id;
419 u16 dvsec_id;
420 u16 dvsec_rev;
421 u16 match_offset;
422 u32 match_mask_and;
423 u32 match_value;
424 u16 reg_offset;
425 u32 reg_mask_and;
426 u32 reg_mask_or;
427 };
428
429 enum hpx_type3_dev_type {
430 HPX_TYPE_ENDPOINT = BIT(0),
431 HPX_TYPE_LEG_END = BIT(1),
432 HPX_TYPE_RC_END = BIT(2),
433 HPX_TYPE_RC_EC = BIT(3),
434 HPX_TYPE_ROOT_PORT = BIT(4),
435 HPX_TYPE_UPSTREAM = BIT(5),
436 HPX_TYPE_DOWNSTREAM = BIT(6),
437 HPX_TYPE_PCI_BRIDGE = BIT(7),
438 HPX_TYPE_PCIE_BRIDGE = BIT(8),
439 };
440
hpx3_device_type(struct pci_dev * dev)441 static u16 hpx3_device_type(struct pci_dev *dev)
442 {
443 u16 pcie_type = pci_pcie_type(dev);
444 static const int pcie_to_hpx3_type[] = {
445 [PCI_EXP_TYPE_ENDPOINT] = HPX_TYPE_ENDPOINT,
446 [PCI_EXP_TYPE_LEG_END] = HPX_TYPE_LEG_END,
447 [PCI_EXP_TYPE_RC_END] = HPX_TYPE_RC_END,
448 [PCI_EXP_TYPE_RC_EC] = HPX_TYPE_RC_EC,
449 [PCI_EXP_TYPE_ROOT_PORT] = HPX_TYPE_ROOT_PORT,
450 [PCI_EXP_TYPE_UPSTREAM] = HPX_TYPE_UPSTREAM,
451 [PCI_EXP_TYPE_DOWNSTREAM] = HPX_TYPE_DOWNSTREAM,
452 [PCI_EXP_TYPE_PCI_BRIDGE] = HPX_TYPE_PCI_BRIDGE,
453 [PCI_EXP_TYPE_PCIE_BRIDGE] = HPX_TYPE_PCIE_BRIDGE,
454 };
455
456 if (pcie_type >= ARRAY_SIZE(pcie_to_hpx3_type))
457 return 0;
458
459 return pcie_to_hpx3_type[pcie_type];
460 }
461
462 enum hpx_type3_fn_type {
463 HPX_FN_NORMAL = BIT(0),
464 HPX_FN_SRIOV_PHYS = BIT(1),
465 HPX_FN_SRIOV_VIRT = BIT(2),
466 };
467
hpx3_function_type(struct pci_dev * dev)468 static u8 hpx3_function_type(struct pci_dev *dev)
469 {
470 if (dev->is_virtfn)
471 return HPX_FN_SRIOV_VIRT;
472 else if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV) > 0)
473 return HPX_FN_SRIOV_PHYS;
474 else
475 return HPX_FN_NORMAL;
476 }
477
hpx3_cap_ver_matches(u8 pcie_cap_id,u8 hpx3_cap_id)478 static bool hpx3_cap_ver_matches(u8 pcie_cap_id, u8 hpx3_cap_id)
479 {
480 u8 cap_ver = hpx3_cap_id & 0xf;
481
482 if ((hpx3_cap_id & BIT(4)) && cap_ver >= pcie_cap_id)
483 return true;
484 else if (cap_ver == pcie_cap_id)
485 return true;
486
487 return false;
488 }
489
490 enum hpx_type3_cfg_loc {
491 HPX_CFG_PCICFG = 0,
492 HPX_CFG_PCIE_CAP = 1,
493 HPX_CFG_PCIE_CAP_EXT = 2,
494 HPX_CFG_VEND_CAP = 3,
495 HPX_CFG_DVSEC = 4,
496 HPX_CFG_MAX,
497 };
498
program_hpx_type3_register(struct pci_dev * dev,const struct hpx_type3 * reg)499 static void program_hpx_type3_register(struct pci_dev *dev,
500 const struct hpx_type3 *reg)
501 {
502 u32 match_reg, write_reg, header, orig_value;
503 u16 pos;
504
505 if (!(hpx3_device_type(dev) & reg->device_type))
506 return;
507
508 if (!(hpx3_function_type(dev) & reg->function_type))
509 return;
510
511 switch (reg->config_space_location) {
512 case HPX_CFG_PCICFG:
513 pos = 0;
514 break;
515 case HPX_CFG_PCIE_CAP:
516 pos = pci_find_capability(dev, reg->pci_exp_cap_id);
517 if (pos == 0)
518 return;
519
520 break;
521 case HPX_CFG_PCIE_CAP_EXT:
522 pos = pci_find_ext_capability(dev, reg->pci_exp_cap_id);
523 if (pos == 0)
524 return;
525
526 pci_read_config_dword(dev, pos, &header);
527 if (!hpx3_cap_ver_matches(PCI_EXT_CAP_VER(header),
528 reg->pci_exp_cap_ver))
529 return;
530
531 break;
532 case HPX_CFG_VEND_CAP:
533 case HPX_CFG_DVSEC:
534 default:
535 pci_warn(dev, "Encountered _HPX type 3 with unsupported config space location");
536 return;
537 }
538
539 pci_read_config_dword(dev, pos + reg->match_offset, &match_reg);
540
541 if ((match_reg & reg->match_mask_and) != reg->match_value)
542 return;
543
544 pci_read_config_dword(dev, pos + reg->reg_offset, &write_reg);
545 orig_value = write_reg;
546 write_reg &= reg->reg_mask_and;
547 write_reg |= reg->reg_mask_or;
548
549 if (orig_value == write_reg)
550 return;
551
552 pci_write_config_dword(dev, pos + reg->reg_offset, write_reg);
553
554 pci_dbg(dev, "Applied _HPX3 at [0x%x]: 0x%08x -> 0x%08x",
555 pos, orig_value, write_reg);
556 }
557
program_hpx_type3(struct pci_dev * dev,struct hpx_type3 * hpx)558 static void program_hpx_type3(struct pci_dev *dev, struct hpx_type3 *hpx)
559 {
560 if (!hpx)
561 return;
562
563 if (!pci_is_pcie(dev))
564 return;
565
566 program_hpx_type3_register(dev, hpx);
567 }
568
parse_hpx3_register(struct hpx_type3 * hpx3_reg,union acpi_object * reg_fields)569 static void parse_hpx3_register(struct hpx_type3 *hpx3_reg,
570 union acpi_object *reg_fields)
571 {
572 hpx3_reg->device_type = reg_fields[0].integer.value;
573 hpx3_reg->function_type = reg_fields[1].integer.value;
574 hpx3_reg->config_space_location = reg_fields[2].integer.value;
575 hpx3_reg->pci_exp_cap_id = reg_fields[3].integer.value;
576 hpx3_reg->pci_exp_cap_ver = reg_fields[4].integer.value;
577 hpx3_reg->pci_exp_vendor_id = reg_fields[5].integer.value;
578 hpx3_reg->dvsec_id = reg_fields[6].integer.value;
579 hpx3_reg->dvsec_rev = reg_fields[7].integer.value;
580 hpx3_reg->match_offset = reg_fields[8].integer.value;
581 hpx3_reg->match_mask_and = reg_fields[9].integer.value;
582 hpx3_reg->match_value = reg_fields[10].integer.value;
583 hpx3_reg->reg_offset = reg_fields[11].integer.value;
584 hpx3_reg->reg_mask_and = reg_fields[12].integer.value;
585 hpx3_reg->reg_mask_or = reg_fields[13].integer.value;
586 }
587
program_type3_hpx_record(struct pci_dev * dev,union acpi_object * record)588 static acpi_status program_type3_hpx_record(struct pci_dev *dev,
589 union acpi_object *record)
590 {
591 union acpi_object *fields = record->package.elements;
592 u32 desc_count, expected_length, revision;
593 union acpi_object *reg_fields;
594 struct hpx_type3 hpx3;
595 int i;
596
597 revision = fields[1].integer.value;
598 switch (revision) {
599 case 1:
600 desc_count = fields[2].integer.value;
601 expected_length = 3 + desc_count * 14;
602
603 if (record->package.count != expected_length)
604 return AE_ERROR;
605
606 for (i = 2; i < expected_length; i++)
607 if (fields[i].type != ACPI_TYPE_INTEGER)
608 return AE_ERROR;
609
610 for (i = 0; i < desc_count; i++) {
611 reg_fields = fields + 3 + i * 14;
612 parse_hpx3_register(&hpx3, reg_fields);
613 program_hpx_type3(dev, &hpx3);
614 }
615
616 break;
617 default:
618 printk(KERN_WARNING
619 "%s: Type 3 Revision %d record not supported\n",
620 __func__, revision);
621 return AE_ERROR;
622 }
623 return AE_OK;
624 }
625
acpi_run_hpx(struct pci_dev * dev,acpi_handle handle)626 static acpi_status acpi_run_hpx(struct pci_dev *dev, acpi_handle handle)
627 {
628 acpi_status status;
629 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
630 union acpi_object *package, *record, *fields;
631 struct hpx_type0 hpx0;
632 struct hpx_type1 hpx1;
633 struct hpx_type2 hpx2;
634 u32 type;
635 int i;
636
637 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
638 if (ACPI_FAILURE(status))
639 return status;
640
641 package = (union acpi_object *)buffer.pointer;
642 if (package->type != ACPI_TYPE_PACKAGE) {
643 status = AE_ERROR;
644 goto exit;
645 }
646
647 for (i = 0; i < package->package.count; i++) {
648 record = &package->package.elements[i];
649 if (record->type != ACPI_TYPE_PACKAGE) {
650 status = AE_ERROR;
651 goto exit;
652 }
653
654 fields = record->package.elements;
655 if (fields[0].type != ACPI_TYPE_INTEGER ||
656 fields[1].type != ACPI_TYPE_INTEGER) {
657 status = AE_ERROR;
658 goto exit;
659 }
660
661 type = fields[0].integer.value;
662 switch (type) {
663 case 0:
664 memset(&hpx0, 0, sizeof(hpx0));
665 status = decode_type0_hpx_record(record, &hpx0);
666 if (ACPI_FAILURE(status))
667 goto exit;
668 program_hpx_type0(dev, &hpx0);
669 break;
670 case 1:
671 memset(&hpx1, 0, sizeof(hpx1));
672 status = decode_type1_hpx_record(record, &hpx1);
673 if (ACPI_FAILURE(status))
674 goto exit;
675 program_hpx_type1(dev, &hpx1);
676 break;
677 case 2:
678 memset(&hpx2, 0, sizeof(hpx2));
679 status = decode_type2_hpx_record(record, &hpx2);
680 if (ACPI_FAILURE(status))
681 goto exit;
682 program_hpx_type2(dev, &hpx2);
683 break;
684 case 3:
685 status = program_type3_hpx_record(dev, record);
686 if (ACPI_FAILURE(status))
687 goto exit;
688 break;
689 default:
690 pr_err("%s: Type %d record not supported\n",
691 __func__, type);
692 status = AE_ERROR;
693 goto exit;
694 }
695 }
696 exit:
697 kfree(buffer.pointer);
698 return status;
699 }
700
acpi_run_hpp(struct pci_dev * dev,acpi_handle handle)701 static acpi_status acpi_run_hpp(struct pci_dev *dev, acpi_handle handle)
702 {
703 acpi_status status;
704 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
705 union acpi_object *package, *fields;
706 struct hpx_type0 hpx0;
707 int i;
708
709 memset(&hpx0, 0, sizeof(hpx0));
710
711 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
712 if (ACPI_FAILURE(status))
713 return status;
714
715 package = (union acpi_object *) buffer.pointer;
716 if (package->type != ACPI_TYPE_PACKAGE ||
717 package->package.count != 4) {
718 status = AE_ERROR;
719 goto exit;
720 }
721
722 fields = package->package.elements;
723 for (i = 0; i < 4; i++) {
724 if (fields[i].type != ACPI_TYPE_INTEGER) {
725 status = AE_ERROR;
726 goto exit;
727 }
728 }
729
730 hpx0.revision = 1;
731 hpx0.cache_line_size = fields[0].integer.value;
732 hpx0.latency_timer = fields[1].integer.value;
733 hpx0.enable_serr = fields[2].integer.value;
734 hpx0.enable_perr = fields[3].integer.value;
735
736 program_hpx_type0(dev, &hpx0);
737
738 exit:
739 kfree(buffer.pointer);
740 return status;
741 }
742
743 /* pci_acpi_program_hp_params
744 *
745 * @dev - the pci_dev for which we want parameters
746 */
pci_acpi_program_hp_params(struct pci_dev * dev)747 int pci_acpi_program_hp_params(struct pci_dev *dev)
748 {
749 acpi_status status;
750 acpi_handle handle, phandle;
751 struct pci_bus *pbus;
752
753 if (acpi_pci_disabled)
754 return -ENODEV;
755
756 handle = NULL;
757 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
758 handle = acpi_pci_get_bridge_handle(pbus);
759 if (handle)
760 break;
761 }
762
763 /*
764 * _HPP settings apply to all child buses, until another _HPP is
765 * encountered. If we don't find an _HPP for the input pci dev,
766 * look for it in the parent device scope since that would apply to
767 * this pci dev.
768 */
769 while (handle) {
770 status = acpi_run_hpx(dev, handle);
771 if (ACPI_SUCCESS(status))
772 return 0;
773 status = acpi_run_hpp(dev, handle);
774 if (ACPI_SUCCESS(status))
775 return 0;
776 if (acpi_is_root_bridge(handle))
777 break;
778 status = acpi_get_parent(handle, &phandle);
779 if (ACPI_FAILURE(status))
780 break;
781 handle = phandle;
782 }
783 return -ENODEV;
784 }
785
786 /**
787 * pciehp_is_native - Check whether a hotplug port is handled by the OS
788 * @bridge: Hotplug port to check
789 *
790 * Returns true if the given @bridge is handled by the native PCIe hotplug
791 * driver.
792 */
pciehp_is_native(struct pci_dev * bridge)793 bool pciehp_is_native(struct pci_dev *bridge)
794 {
795 const struct pci_host_bridge *host;
796 u32 slot_cap;
797
798 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
799 return false;
800
801 pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
802 if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
803 return false;
804
805 if (pcie_ports_native)
806 return true;
807
808 host = pci_find_host_bridge(bridge->bus);
809 return host->native_pcie_hotplug;
810 }
811
812 /**
813 * shpchp_is_native - Check whether a hotplug port is handled by the OS
814 * @bridge: Hotplug port to check
815 *
816 * Returns true if the given @bridge is handled by the native SHPC hotplug
817 * driver.
818 */
shpchp_is_native(struct pci_dev * bridge)819 bool shpchp_is_native(struct pci_dev *bridge)
820 {
821 return bridge->shpc_managed;
822 }
823
824 /**
825 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
826 * @context: Device wakeup context.
827 */
pci_acpi_wake_bus(struct acpi_device_wakeup_context * context)828 static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
829 {
830 struct acpi_device *adev;
831 struct acpi_pci_root *root;
832
833 adev = container_of(context, struct acpi_device, wakeup.context);
834 root = acpi_driver_data(adev);
835 pci_pme_wakeup_bus(root->bus);
836 }
837
838 /**
839 * pci_acpi_wake_dev - PCI device wakeup notification work function.
840 * @context: Device wakeup context.
841 */
pci_acpi_wake_dev(struct acpi_device_wakeup_context * context)842 static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
843 {
844 struct pci_dev *pci_dev;
845
846 pci_dev = to_pci_dev(context->dev);
847
848 if (pci_dev->pme_poll)
849 pci_dev->pme_poll = false;
850
851 if (pci_dev->current_state == PCI_D3cold) {
852 pci_wakeup_event(pci_dev);
853 pm_request_resume(&pci_dev->dev);
854 return;
855 }
856
857 /* Clear PME Status if set. */
858 if (pci_dev->pme_support)
859 pci_check_pme_status(pci_dev);
860
861 pci_wakeup_event(pci_dev);
862 pm_request_resume(&pci_dev->dev);
863
864 pci_pme_wakeup_bus(pci_dev->subordinate);
865 }
866
867 /**
868 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
869 * @dev: PCI root bridge ACPI device.
870 */
pci_acpi_add_bus_pm_notifier(struct acpi_device * dev)871 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
872 {
873 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
874 }
875
876 /**
877 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
878 * @dev: ACPI device to add the notifier for.
879 * @pci_dev: PCI device to check for the PME status if an event is signaled.
880 */
pci_acpi_add_pm_notifier(struct acpi_device * dev,struct pci_dev * pci_dev)881 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
882 struct pci_dev *pci_dev)
883 {
884 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
885 }
886
887 /*
888 * _SxD returns the D-state with the highest power
889 * (lowest D-state number) supported in the S-state "x".
890 *
891 * If the devices does not have a _PRW
892 * (Power Resources for Wake) supporting system wakeup from "x"
893 * then the OS is free to choose a lower power (higher number
894 * D-state) than the return value from _SxD.
895 *
896 * But if _PRW is enabled at S-state "x", the OS
897 * must not choose a power lower than _SxD --
898 * unless the device has an _SxW method specifying
899 * the lowest power (highest D-state number) the device
900 * may enter while still able to wake the system.
901 *
902 * ie. depending on global OS policy:
903 *
904 * if (_PRW at S-state x)
905 * choose from highest power _SxD to lowest power _SxW
906 * else // no _PRW at S-state x
907 * choose highest power _SxD or any lower power
908 */
909
acpi_pci_choose_state(struct pci_dev * pdev)910 pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
911 {
912 int acpi_state, d_max;
913
914 if (pdev->no_d3cold || !pdev->d3cold_allowed)
915 d_max = ACPI_STATE_D3_HOT;
916 else
917 d_max = ACPI_STATE_D3_COLD;
918 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
919 if (acpi_state < 0)
920 return PCI_POWER_ERROR;
921
922 switch (acpi_state) {
923 case ACPI_STATE_D0:
924 return PCI_D0;
925 case ACPI_STATE_D1:
926 return PCI_D1;
927 case ACPI_STATE_D2:
928 return PCI_D2;
929 case ACPI_STATE_D3_HOT:
930 return PCI_D3hot;
931 case ACPI_STATE_D3_COLD:
932 return PCI_D3cold;
933 }
934 return PCI_POWER_ERROR;
935 }
936
937 static struct acpi_device *acpi_pci_find_companion(struct device *dev);
938
pci_set_acpi_fwnode(struct pci_dev * dev)939 void pci_set_acpi_fwnode(struct pci_dev *dev)
940 {
941 if (!dev_fwnode(&dev->dev) && !pci_dev_is_added(dev))
942 ACPI_COMPANION_SET(&dev->dev,
943 acpi_pci_find_companion(&dev->dev));
944 }
945
946 /**
947 * pci_dev_acpi_reset - do a function level reset using _RST method
948 * @dev: device to reset
949 * @probe: if true, return 0 if device supports _RST
950 */
pci_dev_acpi_reset(struct pci_dev * dev,bool probe)951 int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
952 {
953 acpi_handle handle = ACPI_HANDLE(&dev->dev);
954
955 if (!handle || !acpi_has_method(handle, "_RST"))
956 return -ENOTTY;
957
958 if (probe)
959 return 0;
960
961 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
962 pci_warn(dev, "ACPI _RST failed\n");
963 return -ENOTTY;
964 }
965
966 return 0;
967 }
968
acpi_pci_power_manageable(struct pci_dev * dev)969 bool acpi_pci_power_manageable(struct pci_dev *dev)
970 {
971 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
972
973 return adev && acpi_device_power_manageable(adev);
974 }
975
acpi_pci_bridge_d3(struct pci_dev * dev)976 bool acpi_pci_bridge_d3(struct pci_dev *dev)
977 {
978 struct pci_dev *rpdev;
979 struct acpi_device *adev, *rpadev;
980 const union acpi_object *obj;
981
982 if (acpi_pci_disabled || !dev->is_hotplug_bridge)
983 return false;
984
985 adev = ACPI_COMPANION(&dev->dev);
986 if (adev) {
987 /*
988 * If the bridge has _S0W, whether or not it can go into D3
989 * depends on what is returned by that object. In particular,
990 * if the power state returned by _S0W is D2 or shallower,
991 * entering D3 should not be allowed.
992 */
993 if (acpi_dev_power_state_for_wake(adev) <= ACPI_STATE_D2)
994 return false;
995
996 /*
997 * Otherwise, assume that the bridge can enter D3 so long as it
998 * is power-manageable via ACPI.
999 */
1000 if (acpi_device_power_manageable(adev))
1001 return true;
1002 }
1003
1004 rpdev = pcie_find_root_port(dev);
1005 if (!rpdev)
1006 return false;
1007
1008 if (rpdev == dev)
1009 rpadev = adev;
1010 else
1011 rpadev = ACPI_COMPANION(&rpdev->dev);
1012
1013 if (!rpadev)
1014 return false;
1015
1016 /*
1017 * If the Root Port cannot signal wakeup signals at all, i.e., it
1018 * doesn't supply a wakeup GPE via _PRW, it cannot signal hotplug
1019 * events from low-power states including D3hot and D3cold.
1020 */
1021 if (!rpadev->wakeup.flags.valid)
1022 return false;
1023
1024 /*
1025 * In the bridge-below-a-Root-Port case, evaluate _S0W for the Root Port
1026 * to verify whether or not it can signal wakeup from D3.
1027 */
1028 if (rpadev != adev &&
1029 acpi_dev_power_state_for_wake(rpadev) <= ACPI_STATE_D2)
1030 return false;
1031
1032 /*
1033 * The "HotPlugSupportInD3" property in a Root Port _DSD indicates
1034 * the Port can signal hotplug events while in D3. We assume any
1035 * bridges *below* that Root Port can also signal hotplug events
1036 * while in D3.
1037 */
1038 if (!acpi_dev_get_property(rpadev, "HotPlugSupportInD3",
1039 ACPI_TYPE_INTEGER, &obj) &&
1040 obj->integer.value == 1)
1041 return true;
1042
1043 return false;
1044 }
1045
acpi_pci_config_space_access(struct pci_dev * dev,bool enable)1046 static void acpi_pci_config_space_access(struct pci_dev *dev, bool enable)
1047 {
1048 int val = enable ? ACPI_REG_CONNECT : ACPI_REG_DISCONNECT;
1049 int ret = acpi_evaluate_reg(ACPI_HANDLE(&dev->dev),
1050 ACPI_ADR_SPACE_PCI_CONFIG, val);
1051 if (ret)
1052 pci_dbg(dev, "ACPI _REG %s evaluation failed (%d)\n",
1053 enable ? "connect" : "disconnect", ret);
1054 }
1055
acpi_pci_set_power_state(struct pci_dev * dev,pci_power_t state)1056 int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
1057 {
1058 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1059 static const u8 state_conv[] = {
1060 [PCI_D0] = ACPI_STATE_D0,
1061 [PCI_D1] = ACPI_STATE_D1,
1062 [PCI_D2] = ACPI_STATE_D2,
1063 [PCI_D3hot] = ACPI_STATE_D3_HOT,
1064 [PCI_D3cold] = ACPI_STATE_D3_COLD,
1065 };
1066 int error;
1067
1068 /* If the ACPI device has _EJ0, ignore the device */
1069 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
1070 return -ENODEV;
1071
1072 switch (state) {
1073 case PCI_D0:
1074 case PCI_D1:
1075 case PCI_D2:
1076 case PCI_D3hot:
1077 case PCI_D3cold:
1078 break;
1079 default:
1080 return -EINVAL;
1081 }
1082
1083 if (state == PCI_D3cold) {
1084 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
1085 PM_QOS_FLAGS_ALL)
1086 return -EBUSY;
1087
1088 /* Notify AML lack of PCI config space availability */
1089 acpi_pci_config_space_access(dev, false);
1090 }
1091
1092 error = acpi_device_set_power(adev, state_conv[state]);
1093 if (error)
1094 return error;
1095
1096 pci_dbg(dev, "power state changed by ACPI to %s\n",
1097 acpi_power_state_string(adev->power.state));
1098
1099 /*
1100 * Notify AML of PCI config space availability. Config space is
1101 * accessible in all states except D3cold; the only transitions
1102 * that change availability are transitions to D3cold and from
1103 * D3cold to D0.
1104 */
1105 if (state == PCI_D0)
1106 acpi_pci_config_space_access(dev, true);
1107
1108 return 0;
1109 }
1110
acpi_pci_get_power_state(struct pci_dev * dev)1111 pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
1112 {
1113 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1114 static const pci_power_t state_conv[] = {
1115 [ACPI_STATE_D0] = PCI_D0,
1116 [ACPI_STATE_D1] = PCI_D1,
1117 [ACPI_STATE_D2] = PCI_D2,
1118 [ACPI_STATE_D3_HOT] = PCI_D3hot,
1119 [ACPI_STATE_D3_COLD] = PCI_D3cold,
1120 };
1121 int state;
1122
1123 if (!adev || !acpi_device_power_manageable(adev))
1124 return PCI_UNKNOWN;
1125
1126 state = adev->power.state;
1127 if (state == ACPI_STATE_UNKNOWN)
1128 return PCI_UNKNOWN;
1129
1130 return state_conv[state];
1131 }
1132
acpi_pci_refresh_power_state(struct pci_dev * dev)1133 void acpi_pci_refresh_power_state(struct pci_dev *dev)
1134 {
1135 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1136
1137 if (adev && acpi_device_power_manageable(adev))
1138 acpi_device_update_power(adev, NULL);
1139 }
1140
acpi_pci_propagate_wakeup(struct pci_bus * bus,bool enable)1141 static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
1142 {
1143 while (bus->parent) {
1144 if (acpi_pm_device_can_wakeup(&bus->self->dev))
1145 return acpi_pm_set_device_wakeup(&bus->self->dev, enable);
1146
1147 bus = bus->parent;
1148 }
1149
1150 /* We have reached the root bus. */
1151 if (bus->bridge) {
1152 if (acpi_pm_device_can_wakeup(bus->bridge))
1153 return acpi_pm_set_device_wakeup(bus->bridge, enable);
1154 }
1155 return 0;
1156 }
1157
acpi_pci_wakeup(struct pci_dev * dev,bool enable)1158 int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
1159 {
1160 if (acpi_pci_disabled)
1161 return 0;
1162
1163 if (acpi_pm_device_can_wakeup(&dev->dev))
1164 return acpi_pm_set_device_wakeup(&dev->dev, enable);
1165
1166 return acpi_pci_propagate_wakeup(dev->bus, enable);
1167 }
1168
acpi_pci_need_resume(struct pci_dev * dev)1169 bool acpi_pci_need_resume(struct pci_dev *dev)
1170 {
1171 struct acpi_device *adev;
1172
1173 if (acpi_pci_disabled)
1174 return false;
1175
1176 /*
1177 * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
1178 * system-wide suspend/resume confuses the platform firmware, so avoid
1179 * doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
1180 * devices are expected to be in D3 before invoking the S3 entry path
1181 * from the firmware, so they should not be affected by this issue.
1182 */
1183 if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
1184 return true;
1185
1186 adev = ACPI_COMPANION(&dev->dev);
1187 if (!adev || !acpi_device_power_manageable(adev))
1188 return false;
1189
1190 if (adev->wakeup.flags.valid &&
1191 device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
1192 return true;
1193
1194 if (acpi_target_system_state() == ACPI_STATE_S0)
1195 return false;
1196
1197 return !!adev->power.flags.dsw_present;
1198 }
1199
acpi_pci_add_bus(struct pci_bus * bus)1200 void acpi_pci_add_bus(struct pci_bus *bus)
1201 {
1202 union acpi_object *obj;
1203 struct pci_host_bridge *bridge;
1204
1205 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
1206 return;
1207
1208 acpi_pci_slot_enumerate(bus);
1209 acpiphp_enumerate_slots(bus);
1210
1211 /*
1212 * For a host bridge, check its _DSM for function 8 and if
1213 * that is available, mark it in pci_host_bridge.
1214 */
1215 if (!pci_is_root_bus(bus))
1216 return;
1217
1218 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
1219 DSM_PCI_POWER_ON_RESET_DELAY, NULL);
1220 if (!obj)
1221 return;
1222
1223 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
1224 bridge = pci_find_host_bridge(bus);
1225 bridge->ignore_reset_delay = 1;
1226 }
1227 ACPI_FREE(obj);
1228 }
1229
acpi_pci_remove_bus(struct pci_bus * bus)1230 void acpi_pci_remove_bus(struct pci_bus *bus)
1231 {
1232 if (acpi_pci_disabled || !bus->bridge)
1233 return;
1234
1235 acpiphp_remove_slots(bus);
1236 acpi_pci_slot_remove(bus);
1237 }
1238
1239 /* ACPI bus type */
1240
1241
1242 static DECLARE_RWSEM(pci_acpi_companion_lookup_sem);
1243 static struct acpi_device *(*pci_acpi_find_companion_hook)(struct pci_dev *);
1244
1245 /**
1246 * pci_acpi_set_companion_lookup_hook - Set ACPI companion lookup callback.
1247 * @func: ACPI companion lookup callback pointer or NULL.
1248 *
1249 * Set a special ACPI companion lookup callback for PCI devices whose companion
1250 * objects in the ACPI namespace have _ADR with non-standard bus-device-function
1251 * encodings.
1252 *
1253 * Return 0 on success or a negative error code on failure (in which case no
1254 * changes are made).
1255 *
1256 * The caller is responsible for the appropriate ordering of the invocations of
1257 * this function with respect to the enumeration of the PCI devices needing the
1258 * callback installed by it.
1259 */
pci_acpi_set_companion_lookup_hook(struct acpi_device * (* func)(struct pci_dev *))1260 int pci_acpi_set_companion_lookup_hook(struct acpi_device *(*func)(struct pci_dev *))
1261 {
1262 int ret;
1263
1264 if (!func)
1265 return -EINVAL;
1266
1267 down_write(&pci_acpi_companion_lookup_sem);
1268
1269 if (pci_acpi_find_companion_hook) {
1270 ret = -EBUSY;
1271 } else {
1272 pci_acpi_find_companion_hook = func;
1273 ret = 0;
1274 }
1275
1276 up_write(&pci_acpi_companion_lookup_sem);
1277
1278 return ret;
1279 }
1280 EXPORT_SYMBOL_GPL(pci_acpi_set_companion_lookup_hook);
1281
1282 /**
1283 * pci_acpi_clear_companion_lookup_hook - Clear ACPI companion lookup callback.
1284 *
1285 * Clear the special ACPI companion lookup callback previously set by
1286 * pci_acpi_set_companion_lookup_hook(). Block until the last running instance
1287 * of the callback returns before clearing it.
1288 *
1289 * The caller is responsible for the appropriate ordering of the invocations of
1290 * this function with respect to the enumeration of the PCI devices needing the
1291 * callback cleared by it.
1292 */
pci_acpi_clear_companion_lookup_hook(void)1293 void pci_acpi_clear_companion_lookup_hook(void)
1294 {
1295 down_write(&pci_acpi_companion_lookup_sem);
1296
1297 pci_acpi_find_companion_hook = NULL;
1298
1299 up_write(&pci_acpi_companion_lookup_sem);
1300 }
1301 EXPORT_SYMBOL_GPL(pci_acpi_clear_companion_lookup_hook);
1302
acpi_pci_find_companion(struct device * dev)1303 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
1304 {
1305 struct pci_dev *pci_dev = to_pci_dev(dev);
1306 struct acpi_device *adev;
1307 bool check_children;
1308 u64 addr;
1309
1310 if (!dev->parent)
1311 return NULL;
1312
1313 down_read(&pci_acpi_companion_lookup_sem);
1314
1315 adev = pci_acpi_find_companion_hook ?
1316 pci_acpi_find_companion_hook(pci_dev) : NULL;
1317
1318 up_read(&pci_acpi_companion_lookup_sem);
1319
1320 if (adev)
1321 return adev;
1322
1323 check_children = pci_is_bridge(pci_dev);
1324 /* Please ref to ACPI spec for the syntax of _ADR */
1325 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
1326 adev = acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
1327 check_children);
1328
1329 /*
1330 * There may be ACPI device objects in the ACPI namespace that are
1331 * children of the device object representing the host bridge, but don't
1332 * represent PCI devices. Both _HID and _ADR may be present for them,
1333 * even though that is against the specification (for example, see
1334 * Section 6.1 of ACPI 6.3), but in many cases the _ADR returns 0 which
1335 * appears to indicate that they should not be taken into consideration
1336 * as potential companions of PCI devices on the root bus.
1337 *
1338 * To catch this special case, disregard the returned device object if
1339 * it has a valid _HID, addr is 0 and the PCI device at hand is on the
1340 * root bus.
1341 */
1342 if (adev && adev->pnp.type.platform_id && !addr &&
1343 pci_is_root_bus(pci_dev->bus))
1344 return NULL;
1345
1346 return adev;
1347 }
1348
1349 /**
1350 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
1351 * @pdev: the PCI device whose delay is to be updated
1352 * @handle: ACPI handle of this device
1353 *
1354 * Update the d3hot_delay and d3cold_delay of a PCI device from the ACPI _DSM
1355 * control method of either the device itself or the PCI host bridge.
1356 *
1357 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
1358 * host bridge. If it returns one, the OS may assume that all devices in
1359 * the hierarchy have already completed power-on reset delays.
1360 *
1361 * Function 9, "Device Readiness Durations," applies only to the object
1362 * where it is located. It returns delay durations required after various
1363 * events if the device requires less time than the spec requires. Delays
1364 * from this function take precedence over the Reset Delay function.
1365 *
1366 * These _DSM functions are defined by the draft ECN of January 28, 2014,
1367 * titled "ACPI additions for FW latency optimizations."
1368 */
pci_acpi_optimize_delay(struct pci_dev * pdev,acpi_handle handle)1369 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
1370 acpi_handle handle)
1371 {
1372 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
1373 int value;
1374 union acpi_object *obj, *elements;
1375
1376 if (bridge->ignore_reset_delay)
1377 pdev->d3cold_delay = 0;
1378
1379 obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
1380 DSM_PCI_DEVICE_READINESS_DURATIONS, NULL);
1381 if (!obj)
1382 return;
1383
1384 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
1385 elements = obj->package.elements;
1386 if (elements[0].type == ACPI_TYPE_INTEGER) {
1387 value = (int)elements[0].integer.value / 1000;
1388 if (value < PCI_PM_D3COLD_WAIT)
1389 pdev->d3cold_delay = value;
1390 }
1391 if (elements[3].type == ACPI_TYPE_INTEGER) {
1392 value = (int)elements[3].integer.value / 1000;
1393 if (value < PCI_PM_D3HOT_WAIT)
1394 pdev->d3hot_delay = value;
1395 }
1396 }
1397 ACPI_FREE(obj);
1398 }
1399
pci_acpi_set_external_facing(struct pci_dev * dev)1400 static void pci_acpi_set_external_facing(struct pci_dev *dev)
1401 {
1402 u8 val;
1403
1404 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1405 return;
1406 if (device_property_read_u8(&dev->dev, "ExternalFacingPort", &val))
1407 return;
1408
1409 /*
1410 * These root ports expose PCIe (including DMA) outside of the
1411 * system. Everything downstream from them is external.
1412 */
1413 if (val)
1414 dev->external_facing = 1;
1415 }
1416
pci_acpi_setup(struct device * dev,struct acpi_device * adev)1417 void pci_acpi_setup(struct device *dev, struct acpi_device *adev)
1418 {
1419 struct pci_dev *pci_dev = to_pci_dev(dev);
1420
1421 pci_acpi_optimize_delay(pci_dev, adev->handle);
1422 pci_acpi_set_external_facing(pci_dev);
1423 pci_acpi_add_edr_notifier(pci_dev);
1424
1425 pci_acpi_add_pm_notifier(adev, pci_dev);
1426 if (!adev->wakeup.flags.valid)
1427 return;
1428
1429 device_set_wakeup_capable(dev, true);
1430 /*
1431 * For bridges that can do D3 we enable wake automatically (as
1432 * we do for the power management itself in that case). The
1433 * reason is that the bridge may have additional methods such as
1434 * _DSW that need to be called.
1435 */
1436 if (pci_dev->bridge_d3)
1437 device_wakeup_enable(dev);
1438
1439 acpi_pci_wakeup(pci_dev, false);
1440 acpi_device_power_add_dependent(adev, dev);
1441
1442 if (pci_is_bridge(pci_dev))
1443 acpi_dev_power_up_children_with_adr(adev);
1444 }
1445
pci_acpi_cleanup(struct device * dev,struct acpi_device * adev)1446 void pci_acpi_cleanup(struct device *dev, struct acpi_device *adev)
1447 {
1448 struct pci_dev *pci_dev = to_pci_dev(dev);
1449
1450 pci_acpi_remove_edr_notifier(pci_dev);
1451 pci_acpi_remove_pm_notifier(adev);
1452 if (adev->wakeup.flags.valid) {
1453 acpi_device_power_remove_dependent(adev, dev);
1454 if (pci_dev->bridge_d3)
1455 device_wakeup_disable(dev);
1456
1457 device_set_wakeup_capable(dev, false);
1458 }
1459 }
1460
1461 static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
1462
1463 /**
1464 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
1465 * @fn: Callback matching a device to a fwnode that identifies a PCI
1466 * MSI domain.
1467 *
1468 * This should be called by irqchip driver, which is the parent of
1469 * the MSI domain to provide callback interface to query fwnode.
1470 */
1471 void
pci_msi_register_fwnode_provider(struct fwnode_handle * (* fn)(struct device *))1472 pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
1473 {
1474 pci_msi_get_fwnode_cb = fn;
1475 }
1476
1477 /**
1478 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
1479 * @bus: The PCI host bridge bus.
1480 *
1481 * This function uses the callback function registered by
1482 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
1483 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
1484 * This returns NULL on error or when the domain is not found.
1485 */
pci_host_bridge_acpi_msi_domain(struct pci_bus * bus)1486 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
1487 {
1488 struct fwnode_handle *fwnode;
1489
1490 if (!pci_msi_get_fwnode_cb)
1491 return NULL;
1492
1493 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
1494 if (!fwnode)
1495 return NULL;
1496
1497 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
1498 }
1499
acpi_pci_init(void)1500 static int __init acpi_pci_init(void)
1501 {
1502 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
1503 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
1504 pci_no_msi();
1505 }
1506
1507 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
1508 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
1509 pcie_no_aspm();
1510 }
1511
1512 if (acpi_pci_disabled)
1513 return 0;
1514
1515 acpi_pci_slot_init();
1516 acpiphp_init();
1517
1518 return 0;
1519 }
1520 arch_initcall(acpi_pci_init);
1521