1 // SPDX-License-Identifier: GPL-2.0
7 * Copyright (C) 2004 Intel Corp.
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/pci-ecam.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/pm_qos.h>
21 #include <linux/rwsem.h>
25 * The GUID is defined in the PCI Firmware Specification available
26 * here to PCI-SIG members:
27 * https://members.pcisig.com/wg/PCI-SIG/document/15350
29 const guid_t pci_acpi_dsm_guid =
30 GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
31 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
33 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
34 static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
36 struct device *dev = &adev->dev;
37 struct resource_entry *entry;
38 struct list_head list;
42 INIT_LIST_HEAD(&list);
43 flags = IORESOURCE_MEM;
44 ret = acpi_dev_get_resources(adev, &list,
45 acpi_dev_filter_resource_type_cb,
48 dev_err(dev, "failed to parse _CRS method, error code %d\n",
54 dev_err(dev, "no IO and memory resources present in _CRS\n");
58 entry = list_first_entry(&list, struct resource_entry, node);
60 acpi_dev_free_resource_list(&list);
64 static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
67 u16 *segment = context;
68 unsigned long long uid;
71 status = acpi_evaluate_integer(handle, METHOD_NAME__UID, NULL, &uid);
72 if (ACPI_FAILURE(status) || uid != *segment)
75 *(acpi_handle *)retval = handle;
76 return AE_CTRL_TERMINATE;
79 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
82 struct acpi_device *adev;
87 status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
88 if (ACPI_FAILURE(status)) {
89 dev_err(dev, "can't find _HID %s device to locate resources\n",
94 adev = acpi_fetch_acpi_dev(handle);
98 ret = acpi_get_rc_addr(adev, res);
100 dev_err(dev, "can't get resource from %s\n",
101 dev_name(&adev->dev));
109 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
111 acpi_status status = AE_NOT_EXIST;
112 unsigned long long mcfg_addr;
115 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
117 if (ACPI_FAILURE(status))
120 return (phys_addr_t)mcfg_addr;
123 bool pci_acpi_preserve_config(struct pci_host_bridge *host_bridge)
125 if (ACPI_HANDLE(&host_bridge->dev)) {
126 union acpi_object *obj;
129 * Evaluate the "PCI Boot Configuration" _DSM Function. If it
130 * exists and returns 0, we must preserve any PCI resource
131 * assignments made by firmware for this host bridge.
133 obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(&host_bridge->dev),
135 1, DSM_PCI_PRESERVE_BOOT_CONFIG,
136 NULL, ACPI_TYPE_INTEGER);
137 if (obj && obj->integer.value == 0)
145 /* _HPX PCI Setting Record (Type 0); same as _HPP */
147 u32 revision; /* Not present in _HPP */
148 u8 cache_line_size; /* Not applicable to PCIe */
149 u8 latency_timer; /* Not applicable to PCIe */
154 static struct hpx_type0 pci_default_type0 = {
156 .cache_line_size = 8,
157 .latency_timer = 0x40,
162 static void program_hpx_type0(struct pci_dev *dev, struct hpx_type0 *hpx)
164 u16 pci_cmd, pci_bctl;
167 hpx = &pci_default_type0;
169 if (hpx->revision > 1) {
170 pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
172 hpx = &pci_default_type0;
175 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpx->cache_line_size);
176 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpx->latency_timer);
177 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
178 if (hpx->enable_serr)
179 pci_cmd |= PCI_COMMAND_SERR;
180 if (hpx->enable_perr)
181 pci_cmd |= PCI_COMMAND_PARITY;
182 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
184 /* Program bridge control value */
185 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
186 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
188 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
189 if (hpx->enable_perr)
190 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
191 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
195 static acpi_status decode_type0_hpx_record(union acpi_object *record,
196 struct hpx_type0 *hpx0)
199 union acpi_object *fields = record->package.elements;
200 u32 revision = fields[1].integer.value;
204 if (record->package.count != 6)
206 for (i = 2; i < 6; i++)
207 if (fields[i].type != ACPI_TYPE_INTEGER)
209 hpx0->revision = revision;
210 hpx0->cache_line_size = fields[2].integer.value;
211 hpx0->latency_timer = fields[3].integer.value;
212 hpx0->enable_serr = fields[4].integer.value;
213 hpx0->enable_perr = fields[5].integer.value;
216 pr_warn("%s: Type 0 Revision %d record not supported\n",
223 /* _HPX PCI-X Setting Record (Type 1) */
231 static void program_hpx_type1(struct pci_dev *dev, struct hpx_type1 *hpx)
238 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
242 pci_warn(dev, "PCI-X settings not supported\n");
245 static acpi_status decode_type1_hpx_record(union acpi_object *record,
246 struct hpx_type1 *hpx1)
249 union acpi_object *fields = record->package.elements;
250 u32 revision = fields[1].integer.value;
254 if (record->package.count != 5)
256 for (i = 2; i < 5; i++)
257 if (fields[i].type != ACPI_TYPE_INTEGER)
259 hpx1->revision = revision;
260 hpx1->max_mem_read = fields[2].integer.value;
261 hpx1->avg_max_split = fields[3].integer.value;
262 hpx1->tot_max_split = fields[4].integer.value;
265 pr_warn("%s: Type 1 Revision %d record not supported\n",
272 static bool pcie_root_rcb_set(struct pci_dev *dev)
274 struct pci_dev *rp = pcie_find_root_port(dev);
280 pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
281 if (lnkctl & PCI_EXP_LNKCTL_RCB)
287 /* _HPX PCI Express Setting Record (Type 2) */
290 u32 unc_err_mask_and;
292 u32 unc_err_sever_and;
293 u32 unc_err_sever_or;
294 u32 cor_err_mask_and;
298 u16 pci_exp_devctl_and;
299 u16 pci_exp_devctl_or;
300 u16 pci_exp_lnkctl_and;
301 u16 pci_exp_lnkctl_or;
302 u32 sec_unc_err_sever_and;
303 u32 sec_unc_err_sever_or;
304 u32 sec_unc_err_mask_and;
305 u32 sec_unc_err_mask_or;
308 static void program_hpx_type2(struct pci_dev *dev, struct hpx_type2 *hpx)
316 if (!pci_is_pcie(dev))
319 if (hpx->revision > 1) {
320 pci_warn(dev, "PCIe settings rev %d not supported\n",
326 * Don't allow _HPX to change MPS or MRRS settings. We manage
327 * those to make sure they're consistent with the rest of the
330 hpx->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
331 PCI_EXP_DEVCTL_READRQ;
332 hpx->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
333 PCI_EXP_DEVCTL_READRQ);
335 /* Initialize Device Control Register */
336 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
337 ~hpx->pci_exp_devctl_and, hpx->pci_exp_devctl_or);
339 /* Initialize Link Control Register */
340 if (pcie_cap_has_lnkctl(dev)) {
343 * If the Root Port supports Read Completion Boundary of
344 * 128, set RCB to 128. Otherwise, clear it.
346 hpx->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
347 hpx->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
348 if (pcie_root_rcb_set(dev))
349 hpx->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
351 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
352 ~hpx->pci_exp_lnkctl_and, hpx->pci_exp_lnkctl_or);
355 /* Find Advanced Error Reporting Enhanced Capability */
356 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
360 /* Initialize Uncorrectable Error Mask Register */
361 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
362 reg32 = (reg32 & hpx->unc_err_mask_and) | hpx->unc_err_mask_or;
363 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
365 /* Initialize Uncorrectable Error Severity Register */
366 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
367 reg32 = (reg32 & hpx->unc_err_sever_and) | hpx->unc_err_sever_or;
368 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
370 /* Initialize Correctable Error Mask Register */
371 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
372 reg32 = (reg32 & hpx->cor_err_mask_and) | hpx->cor_err_mask_or;
373 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
375 /* Initialize Advanced Error Capabilities and Control Register */
376 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
377 reg32 = (reg32 & hpx->adv_err_cap_and) | hpx->adv_err_cap_or;
379 /* Don't enable ECRC generation or checking if unsupported */
380 if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
381 reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
382 if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
383 reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
384 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
387 * FIXME: The following two registers are not supported yet.
389 * o Secondary Uncorrectable Error Severity Register
390 * o Secondary Uncorrectable Error Mask Register
394 static acpi_status decode_type2_hpx_record(union acpi_object *record,
395 struct hpx_type2 *hpx2)
398 union acpi_object *fields = record->package.elements;
399 u32 revision = fields[1].integer.value;
403 if (record->package.count != 18)
405 for (i = 2; i < 18; i++)
406 if (fields[i].type != ACPI_TYPE_INTEGER)
408 hpx2->revision = revision;
409 hpx2->unc_err_mask_and = fields[2].integer.value;
410 hpx2->unc_err_mask_or = fields[3].integer.value;
411 hpx2->unc_err_sever_and = fields[4].integer.value;
412 hpx2->unc_err_sever_or = fields[5].integer.value;
413 hpx2->cor_err_mask_and = fields[6].integer.value;
414 hpx2->cor_err_mask_or = fields[7].integer.value;
415 hpx2->adv_err_cap_and = fields[8].integer.value;
416 hpx2->adv_err_cap_or = fields[9].integer.value;
417 hpx2->pci_exp_devctl_and = fields[10].integer.value;
418 hpx2->pci_exp_devctl_or = fields[11].integer.value;
419 hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
420 hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
421 hpx2->sec_unc_err_sever_and = fields[14].integer.value;
422 hpx2->sec_unc_err_sever_or = fields[15].integer.value;
423 hpx2->sec_unc_err_mask_and = fields[16].integer.value;
424 hpx2->sec_unc_err_mask_or = fields[17].integer.value;
427 pr_warn("%s: Type 2 Revision %d record not supported\n",
434 /* _HPX PCI Express Setting Record (Type 3) */
438 u16 config_space_location;
441 u16 pci_exp_vendor_id;
452 enum hpx_type3_dev_type {
453 HPX_TYPE_ENDPOINT = BIT(0),
454 HPX_TYPE_LEG_END = BIT(1),
455 HPX_TYPE_RC_END = BIT(2),
456 HPX_TYPE_RC_EC = BIT(3),
457 HPX_TYPE_ROOT_PORT = BIT(4),
458 HPX_TYPE_UPSTREAM = BIT(5),
459 HPX_TYPE_DOWNSTREAM = BIT(6),
460 HPX_TYPE_PCI_BRIDGE = BIT(7),
461 HPX_TYPE_PCIE_BRIDGE = BIT(8),
464 static u16 hpx3_device_type(struct pci_dev *dev)
466 u16 pcie_type = pci_pcie_type(dev);
467 static const int pcie_to_hpx3_type[] = {
468 [PCI_EXP_TYPE_ENDPOINT] = HPX_TYPE_ENDPOINT,
469 [PCI_EXP_TYPE_LEG_END] = HPX_TYPE_LEG_END,
470 [PCI_EXP_TYPE_RC_END] = HPX_TYPE_RC_END,
471 [PCI_EXP_TYPE_RC_EC] = HPX_TYPE_RC_EC,
472 [PCI_EXP_TYPE_ROOT_PORT] = HPX_TYPE_ROOT_PORT,
473 [PCI_EXP_TYPE_UPSTREAM] = HPX_TYPE_UPSTREAM,
474 [PCI_EXP_TYPE_DOWNSTREAM] = HPX_TYPE_DOWNSTREAM,
475 [PCI_EXP_TYPE_PCI_BRIDGE] = HPX_TYPE_PCI_BRIDGE,
476 [PCI_EXP_TYPE_PCIE_BRIDGE] = HPX_TYPE_PCIE_BRIDGE,
479 if (pcie_type >= ARRAY_SIZE(pcie_to_hpx3_type))
482 return pcie_to_hpx3_type[pcie_type];
485 enum hpx_type3_fn_type {
486 HPX_FN_NORMAL = BIT(0),
487 HPX_FN_SRIOV_PHYS = BIT(1),
488 HPX_FN_SRIOV_VIRT = BIT(2),
491 static u8 hpx3_function_type(struct pci_dev *dev)
494 return HPX_FN_SRIOV_VIRT;
495 else if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV) > 0)
496 return HPX_FN_SRIOV_PHYS;
498 return HPX_FN_NORMAL;
501 static bool hpx3_cap_ver_matches(u8 pcie_cap_id, u8 hpx3_cap_id)
503 u8 cap_ver = hpx3_cap_id & 0xf;
505 if ((hpx3_cap_id & BIT(4)) && cap_ver >= pcie_cap_id)
507 else if (cap_ver == pcie_cap_id)
513 enum hpx_type3_cfg_loc {
515 HPX_CFG_PCIE_CAP = 1,
516 HPX_CFG_PCIE_CAP_EXT = 2,
517 HPX_CFG_VEND_CAP = 3,
522 static void program_hpx_type3_register(struct pci_dev *dev,
523 const struct hpx_type3 *reg)
525 u32 match_reg, write_reg, header, orig_value;
528 if (!(hpx3_device_type(dev) & reg->device_type))
531 if (!(hpx3_function_type(dev) & reg->function_type))
534 switch (reg->config_space_location) {
538 case HPX_CFG_PCIE_CAP:
539 pos = pci_find_capability(dev, reg->pci_exp_cap_id);
544 case HPX_CFG_PCIE_CAP_EXT:
545 pos = pci_find_ext_capability(dev, reg->pci_exp_cap_id);
549 pci_read_config_dword(dev, pos, &header);
550 if (!hpx3_cap_ver_matches(PCI_EXT_CAP_VER(header),
551 reg->pci_exp_cap_ver))
555 case HPX_CFG_VEND_CAP:
558 pci_warn(dev, "Encountered _HPX type 3 with unsupported config space location");
562 pci_read_config_dword(dev, pos + reg->match_offset, &match_reg);
564 if ((match_reg & reg->match_mask_and) != reg->match_value)
567 pci_read_config_dword(dev, pos + reg->reg_offset, &write_reg);
568 orig_value = write_reg;
569 write_reg &= reg->reg_mask_and;
570 write_reg |= reg->reg_mask_or;
572 if (orig_value == write_reg)
575 pci_write_config_dword(dev, pos + reg->reg_offset, write_reg);
577 pci_dbg(dev, "Applied _HPX3 at [0x%x]: 0x%08x -> 0x%08x",
578 pos, orig_value, write_reg);
581 static void program_hpx_type3(struct pci_dev *dev, struct hpx_type3 *hpx)
586 if (!pci_is_pcie(dev))
589 program_hpx_type3_register(dev, hpx);
592 static void parse_hpx3_register(struct hpx_type3 *hpx3_reg,
593 union acpi_object *reg_fields)
595 hpx3_reg->device_type = reg_fields[0].integer.value;
596 hpx3_reg->function_type = reg_fields[1].integer.value;
597 hpx3_reg->config_space_location = reg_fields[2].integer.value;
598 hpx3_reg->pci_exp_cap_id = reg_fields[3].integer.value;
599 hpx3_reg->pci_exp_cap_ver = reg_fields[4].integer.value;
600 hpx3_reg->pci_exp_vendor_id = reg_fields[5].integer.value;
601 hpx3_reg->dvsec_id = reg_fields[6].integer.value;
602 hpx3_reg->dvsec_rev = reg_fields[7].integer.value;
603 hpx3_reg->match_offset = reg_fields[8].integer.value;
604 hpx3_reg->match_mask_and = reg_fields[9].integer.value;
605 hpx3_reg->match_value = reg_fields[10].integer.value;
606 hpx3_reg->reg_offset = reg_fields[11].integer.value;
607 hpx3_reg->reg_mask_and = reg_fields[12].integer.value;
608 hpx3_reg->reg_mask_or = reg_fields[13].integer.value;
611 static acpi_status program_type3_hpx_record(struct pci_dev *dev,
612 union acpi_object *record)
614 union acpi_object *fields = record->package.elements;
615 u32 desc_count, expected_length, revision;
616 union acpi_object *reg_fields;
617 struct hpx_type3 hpx3;
620 revision = fields[1].integer.value;
623 desc_count = fields[2].integer.value;
624 expected_length = 3 + desc_count * 14;
626 if (record->package.count != expected_length)
629 for (i = 2; i < expected_length; i++)
630 if (fields[i].type != ACPI_TYPE_INTEGER)
633 for (i = 0; i < desc_count; i++) {
634 reg_fields = fields + 3 + i * 14;
635 parse_hpx3_register(&hpx3, reg_fields);
636 program_hpx_type3(dev, &hpx3);
642 "%s: Type 3 Revision %d record not supported\n",
649 static acpi_status acpi_run_hpx(struct pci_dev *dev, acpi_handle handle)
652 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
653 union acpi_object *package, *record, *fields;
654 struct hpx_type0 hpx0;
655 struct hpx_type1 hpx1;
656 struct hpx_type2 hpx2;
660 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
661 if (ACPI_FAILURE(status))
664 package = (union acpi_object *)buffer.pointer;
665 if (package->type != ACPI_TYPE_PACKAGE) {
670 for (i = 0; i < package->package.count; i++) {
671 record = &package->package.elements[i];
672 if (record->type != ACPI_TYPE_PACKAGE) {
677 fields = record->package.elements;
678 if (fields[0].type != ACPI_TYPE_INTEGER ||
679 fields[1].type != ACPI_TYPE_INTEGER) {
684 type = fields[0].integer.value;
687 memset(&hpx0, 0, sizeof(hpx0));
688 status = decode_type0_hpx_record(record, &hpx0);
689 if (ACPI_FAILURE(status))
691 program_hpx_type0(dev, &hpx0);
694 memset(&hpx1, 0, sizeof(hpx1));
695 status = decode_type1_hpx_record(record, &hpx1);
696 if (ACPI_FAILURE(status))
698 program_hpx_type1(dev, &hpx1);
701 memset(&hpx2, 0, sizeof(hpx2));
702 status = decode_type2_hpx_record(record, &hpx2);
703 if (ACPI_FAILURE(status))
705 program_hpx_type2(dev, &hpx2);
708 status = program_type3_hpx_record(dev, record);
709 if (ACPI_FAILURE(status))
713 pr_err("%s: Type %d record not supported\n",
720 kfree(buffer.pointer);
724 static acpi_status acpi_run_hpp(struct pci_dev *dev, acpi_handle handle)
727 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
728 union acpi_object *package, *fields;
729 struct hpx_type0 hpx0;
732 memset(&hpx0, 0, sizeof(hpx0));
734 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
735 if (ACPI_FAILURE(status))
738 package = (union acpi_object *) buffer.pointer;
739 if (package->type != ACPI_TYPE_PACKAGE ||
740 package->package.count != 4) {
745 fields = package->package.elements;
746 for (i = 0; i < 4; i++) {
747 if (fields[i].type != ACPI_TYPE_INTEGER) {
754 hpx0.cache_line_size = fields[0].integer.value;
755 hpx0.latency_timer = fields[1].integer.value;
756 hpx0.enable_serr = fields[2].integer.value;
757 hpx0.enable_perr = fields[3].integer.value;
759 program_hpx_type0(dev, &hpx0);
762 kfree(buffer.pointer);
766 /* pci_acpi_program_hp_params
768 * @dev - the pci_dev for which we want parameters
770 int pci_acpi_program_hp_params(struct pci_dev *dev)
773 acpi_handle handle, phandle;
774 struct pci_bus *pbus;
776 if (acpi_pci_disabled)
780 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
781 handle = acpi_pci_get_bridge_handle(pbus);
787 * _HPP settings apply to all child buses, until another _HPP is
788 * encountered. If we don't find an _HPP for the input pci dev,
789 * look for it in the parent device scope since that would apply to
793 status = acpi_run_hpx(dev, handle);
794 if (ACPI_SUCCESS(status))
796 status = acpi_run_hpp(dev, handle);
797 if (ACPI_SUCCESS(status))
799 if (acpi_is_root_bridge(handle))
801 status = acpi_get_parent(handle, &phandle);
802 if (ACPI_FAILURE(status))
810 * pciehp_is_native - Check whether a hotplug port is handled by the OS
811 * @bridge: Hotplug port to check
813 * Returns true if the given @bridge is handled by the native PCIe hotplug
816 bool pciehp_is_native(struct pci_dev *bridge)
818 const struct pci_host_bridge *host;
821 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
824 pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
825 if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
828 if (pcie_ports_native)
831 host = pci_find_host_bridge(bridge->bus);
832 return host->native_pcie_hotplug;
836 * shpchp_is_native - Check whether a hotplug port is handled by the OS
837 * @bridge: Hotplug port to check
839 * Returns true if the given @bridge is handled by the native SHPC hotplug
842 bool shpchp_is_native(struct pci_dev *bridge)
844 return bridge->shpc_managed;
848 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
849 * @context: Device wakeup context.
851 static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
853 struct acpi_device *adev;
854 struct acpi_pci_root *root;
856 adev = container_of(context, struct acpi_device, wakeup.context);
857 root = acpi_driver_data(adev);
858 pci_pme_wakeup_bus(root->bus);
862 * pci_acpi_wake_dev - PCI device wakeup notification work function.
863 * @context: Device wakeup context.
865 static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
867 struct pci_dev *pci_dev;
869 pci_dev = to_pci_dev(context->dev);
871 if (pci_dev->pme_poll)
872 pci_dev->pme_poll = false;
874 if (pci_dev->current_state == PCI_D3cold) {
875 pci_wakeup_event(pci_dev);
876 pm_request_resume(&pci_dev->dev);
880 /* Clear PME Status if set. */
881 if (pci_dev->pme_support)
882 pci_check_pme_status(pci_dev);
884 pci_wakeup_event(pci_dev);
885 pm_request_resume(&pci_dev->dev);
887 pci_pme_wakeup_bus(pci_dev->subordinate);
891 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
892 * @dev: PCI root bridge ACPI device.
894 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
896 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
900 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
901 * @dev: ACPI device to add the notifier for.
902 * @pci_dev: PCI device to check for the PME status if an event is signaled.
904 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
905 struct pci_dev *pci_dev)
907 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
911 * _SxD returns the D-state with the highest power
912 * (lowest D-state number) supported in the S-state "x".
914 * If the devices does not have a _PRW
915 * (Power Resources for Wake) supporting system wakeup from "x"
916 * then the OS is free to choose a lower power (higher number
917 * D-state) than the return value from _SxD.
919 * But if _PRW is enabled at S-state "x", the OS
920 * must not choose a power lower than _SxD --
921 * unless the device has an _SxW method specifying
922 * the lowest power (highest D-state number) the device
923 * may enter while still able to wake the system.
925 * ie. depending on global OS policy:
927 * if (_PRW at S-state x)
928 * choose from highest power _SxD to lowest power _SxW
929 * else // no _PRW at S-state x
930 * choose highest power _SxD or any lower power
933 pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
935 int acpi_state, d_max;
937 if (pdev->no_d3cold || !pdev->d3cold_allowed)
938 d_max = ACPI_STATE_D3_HOT;
940 d_max = ACPI_STATE_D3_COLD;
941 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
943 return PCI_POWER_ERROR;
945 switch (acpi_state) {
952 case ACPI_STATE_D3_HOT:
954 case ACPI_STATE_D3_COLD:
957 return PCI_POWER_ERROR;
960 static struct acpi_device *acpi_pci_find_companion(struct device *dev);
962 void pci_set_acpi_fwnode(struct pci_dev *dev)
964 if (!dev_fwnode(&dev->dev) && !pci_dev_is_added(dev))
965 ACPI_COMPANION_SET(&dev->dev,
966 acpi_pci_find_companion(&dev->dev));
970 * pci_dev_acpi_reset - do a function level reset using _RST method
971 * @dev: device to reset
972 * @probe: if true, return 0 if device supports _RST
974 int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
976 acpi_handle handle = ACPI_HANDLE(&dev->dev);
978 if (!handle || !acpi_has_method(handle, "_RST"))
984 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
985 pci_warn(dev, "ACPI _RST failed\n");
992 bool acpi_pci_power_manageable(struct pci_dev *dev)
994 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
996 return adev && acpi_device_power_manageable(adev);
999 bool acpi_pci_bridge_d3(struct pci_dev *dev)
1001 struct pci_dev *rpdev;
1002 struct acpi_device *adev, *rpadev;
1003 const union acpi_object *obj;
1005 if (acpi_pci_disabled || !dev->is_hotplug_bridge)
1008 adev = ACPI_COMPANION(&dev->dev);
1011 * If the bridge has _S0W, whether or not it can go into D3
1012 * depends on what is returned by that object. In particular,
1013 * if the power state returned by _S0W is D2 or shallower,
1014 * entering D3 should not be allowed.
1016 if (acpi_dev_power_state_for_wake(adev) <= ACPI_STATE_D2)
1020 * Otherwise, assume that the bridge can enter D3 so long as it
1021 * is power-manageable via ACPI.
1023 if (acpi_device_power_manageable(adev))
1027 rpdev = pcie_find_root_port(dev);
1034 rpadev = ACPI_COMPANION(&rpdev->dev);
1040 * If the Root Port cannot signal wakeup signals at all, i.e., it
1041 * doesn't supply a wakeup GPE via _PRW, it cannot signal hotplug
1042 * events from low-power states including D3hot and D3cold.
1044 if (!rpadev->wakeup.flags.valid)
1048 * In the bridge-below-a-Root-Port case, evaluate _S0W for the Root Port
1049 * to verify whether or not it can signal wakeup from D3.
1051 if (rpadev != adev &&
1052 acpi_dev_power_state_for_wake(rpadev) <= ACPI_STATE_D2)
1056 * The "HotPlugSupportInD3" property in a Root Port _DSD indicates
1057 * the Port can signal hotplug events while in D3. We assume any
1058 * bridges *below* that Root Port can also signal hotplug events
1061 if (!acpi_dev_get_property(rpadev, "HotPlugSupportInD3",
1062 ACPI_TYPE_INTEGER, &obj) &&
1063 obj->integer.value == 1)
1069 static void acpi_pci_config_space_access(struct pci_dev *dev, bool enable)
1071 int val = enable ? ACPI_REG_CONNECT : ACPI_REG_DISCONNECT;
1072 int ret = acpi_evaluate_reg(ACPI_HANDLE(&dev->dev),
1073 ACPI_ADR_SPACE_PCI_CONFIG, val);
1075 pci_dbg(dev, "ACPI _REG %s evaluation failed (%d)\n",
1076 enable ? "connect" : "disconnect", ret);
1079 int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
1081 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1082 static const u8 state_conv[] = {
1083 [PCI_D0] = ACPI_STATE_D0,
1084 [PCI_D1] = ACPI_STATE_D1,
1085 [PCI_D2] = ACPI_STATE_D2,
1086 [PCI_D3hot] = ACPI_STATE_D3_HOT,
1087 [PCI_D3cold] = ACPI_STATE_D3_COLD,
1091 /* If the ACPI device has _EJ0, ignore the device */
1092 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
1106 if (state == PCI_D3cold) {
1107 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
1111 /* Notify AML lack of PCI config space availability */
1112 acpi_pci_config_space_access(dev, false);
1115 error = acpi_device_set_power(adev, state_conv[state]);
1119 pci_dbg(dev, "power state changed by ACPI to %s\n",
1120 acpi_power_state_string(adev->power.state));
1123 * Notify AML of PCI config space availability. Config space is
1124 * accessible in all states except D3cold; the only transitions
1125 * that change availability are transitions to D3cold and from
1128 if (state == PCI_D0)
1129 acpi_pci_config_space_access(dev, true);
1134 pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
1136 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1137 static const pci_power_t state_conv[] = {
1138 [ACPI_STATE_D0] = PCI_D0,
1139 [ACPI_STATE_D1] = PCI_D1,
1140 [ACPI_STATE_D2] = PCI_D2,
1141 [ACPI_STATE_D3_HOT] = PCI_D3hot,
1142 [ACPI_STATE_D3_COLD] = PCI_D3cold,
1146 if (!adev || !acpi_device_power_manageable(adev))
1149 state = adev->power.state;
1150 if (state == ACPI_STATE_UNKNOWN)
1153 return state_conv[state];
1156 void acpi_pci_refresh_power_state(struct pci_dev *dev)
1158 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
1160 if (adev && acpi_device_power_manageable(adev))
1161 acpi_device_update_power(adev, NULL);
1164 static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
1166 while (bus->parent) {
1167 if (acpi_pm_device_can_wakeup(&bus->self->dev))
1168 return acpi_pm_set_device_wakeup(&bus->self->dev, enable);
1173 /* We have reached the root bus. */
1175 if (acpi_pm_device_can_wakeup(bus->bridge))
1176 return acpi_pm_set_device_wakeup(bus->bridge, enable);
1181 int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
1183 if (acpi_pci_disabled)
1186 if (acpi_pm_device_can_wakeup(&dev->dev))
1187 return acpi_pm_set_device_wakeup(&dev->dev, enable);
1189 return acpi_pci_propagate_wakeup(dev->bus, enable);
1192 bool acpi_pci_need_resume(struct pci_dev *dev)
1194 struct acpi_device *adev;
1196 if (acpi_pci_disabled)
1200 * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
1201 * system-wide suspend/resume confuses the platform firmware, so avoid
1202 * doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
1203 * devices are expected to be in D3 before invoking the S3 entry path
1204 * from the firmware, so they should not be affected by this issue.
1206 if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
1209 adev = ACPI_COMPANION(&dev->dev);
1210 if (!adev || !acpi_device_power_manageable(adev))
1213 if (adev->wakeup.flags.valid &&
1214 device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
1217 if (acpi_target_system_state() == ACPI_STATE_S0)
1220 return !!adev->power.flags.dsw_present;
1223 void acpi_pci_add_bus(struct pci_bus *bus)
1225 union acpi_object *obj;
1226 struct pci_host_bridge *bridge;
1228 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
1231 acpi_pci_slot_enumerate(bus);
1232 acpiphp_enumerate_slots(bus);
1235 * For a host bridge, check its _DSM for function 8 and if
1236 * that is available, mark it in pci_host_bridge.
1238 if (!pci_is_root_bus(bus))
1241 obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
1242 DSM_PCI_POWER_ON_RESET_DELAY, NULL, ACPI_TYPE_INTEGER);
1246 if (obj->integer.value == 1) {
1247 bridge = pci_find_host_bridge(bus);
1248 bridge->ignore_reset_delay = 1;
1253 void acpi_pci_remove_bus(struct pci_bus *bus)
1255 if (acpi_pci_disabled || !bus->bridge)
1258 acpiphp_remove_slots(bus);
1259 acpi_pci_slot_remove(bus);
1265 static DECLARE_RWSEM(pci_acpi_companion_lookup_sem);
1266 static struct acpi_device *(*pci_acpi_find_companion_hook)(struct pci_dev *);
1269 * pci_acpi_set_companion_lookup_hook - Set ACPI companion lookup callback.
1270 * @func: ACPI companion lookup callback pointer or NULL.
1272 * Set a special ACPI companion lookup callback for PCI devices whose companion
1273 * objects in the ACPI namespace have _ADR with non-standard bus-device-function
1276 * Return 0 on success or a negative error code on failure (in which case no
1277 * changes are made).
1279 * The caller is responsible for the appropriate ordering of the invocations of
1280 * this function with respect to the enumeration of the PCI devices needing the
1281 * callback installed by it.
1283 int pci_acpi_set_companion_lookup_hook(struct acpi_device *(*func)(struct pci_dev *))
1290 down_write(&pci_acpi_companion_lookup_sem);
1292 if (pci_acpi_find_companion_hook) {
1295 pci_acpi_find_companion_hook = func;
1299 up_write(&pci_acpi_companion_lookup_sem);
1303 EXPORT_SYMBOL_GPL(pci_acpi_set_companion_lookup_hook);
1306 * pci_acpi_clear_companion_lookup_hook - Clear ACPI companion lookup callback.
1308 * Clear the special ACPI companion lookup callback previously set by
1309 * pci_acpi_set_companion_lookup_hook(). Block until the last running instance
1310 * of the callback returns before clearing it.
1312 * The caller is responsible for the appropriate ordering of the invocations of
1313 * this function with respect to the enumeration of the PCI devices needing the
1314 * callback cleared by it.
1316 void pci_acpi_clear_companion_lookup_hook(void)
1318 down_write(&pci_acpi_companion_lookup_sem);
1320 pci_acpi_find_companion_hook = NULL;
1322 up_write(&pci_acpi_companion_lookup_sem);
1324 EXPORT_SYMBOL_GPL(pci_acpi_clear_companion_lookup_hook);
1326 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
1328 struct pci_dev *pci_dev = to_pci_dev(dev);
1329 struct acpi_device *adev;
1330 bool check_children;
1336 down_read(&pci_acpi_companion_lookup_sem);
1338 adev = pci_acpi_find_companion_hook ?
1339 pci_acpi_find_companion_hook(pci_dev) : NULL;
1341 up_read(&pci_acpi_companion_lookup_sem);
1346 check_children = pci_is_bridge(pci_dev);
1347 /* Please ref to ACPI spec for the syntax of _ADR */
1348 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
1349 adev = acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
1353 * There may be ACPI device objects in the ACPI namespace that are
1354 * children of the device object representing the host bridge, but don't
1355 * represent PCI devices. Both _HID and _ADR may be present for them,
1356 * even though that is against the specification (for example, see
1357 * Section 6.1 of ACPI 6.3), but in many cases the _ADR returns 0 which
1358 * appears to indicate that they should not be taken into consideration
1359 * as potential companions of PCI devices on the root bus.
1361 * To catch this special case, disregard the returned device object if
1362 * it has a valid _HID, addr is 0 and the PCI device at hand is on the
1365 if (adev && adev->pnp.type.platform_id && !addr &&
1366 pci_is_root_bus(pci_dev->bus))
1373 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
1374 * @pdev: the PCI device whose delay is to be updated
1375 * @handle: ACPI handle of this device
1377 * Update the d3hot_delay and d3cold_delay of a PCI device from the ACPI _DSM
1378 * control method of either the device itself or the PCI host bridge.
1380 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
1381 * host bridge. If it returns one, the OS may assume that all devices in
1382 * the hierarchy have already completed power-on reset delays.
1384 * Function 9, "Device Readiness Durations," applies only to the object
1385 * where it is located. It returns delay durations required after various
1386 * events if the device requires less time than the spec requires. Delays
1387 * from this function take precedence over the Reset Delay function.
1389 * These _DSM functions are defined by the draft ECN of January 28, 2014,
1390 * titled "ACPI additions for FW latency optimizations."
1392 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
1395 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
1397 union acpi_object *obj, *elements;
1399 if (bridge->ignore_reset_delay)
1400 pdev->d3cold_delay = 0;
1402 obj = acpi_evaluate_dsm_typed(handle, &pci_acpi_dsm_guid, 3,
1403 DSM_PCI_DEVICE_READINESS_DURATIONS, NULL,
1408 if (obj->package.count == 5) {
1409 elements = obj->package.elements;
1410 if (elements[0].type == ACPI_TYPE_INTEGER) {
1411 value = (int)elements[0].integer.value / 1000;
1412 if (value < PCI_PM_D3COLD_WAIT)
1413 pdev->d3cold_delay = value;
1415 if (elements[3].type == ACPI_TYPE_INTEGER) {
1416 value = (int)elements[3].integer.value / 1000;
1417 if (value < PCI_PM_D3HOT_WAIT)
1418 pdev->d3hot_delay = value;
1424 static void pci_acpi_set_external_facing(struct pci_dev *dev)
1428 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1430 if (device_property_read_u8(&dev->dev, "ExternalFacingPort", &val))
1434 * These root ports expose PCIe (including DMA) outside of the
1435 * system. Everything downstream from them is external.
1438 dev->external_facing = 1;
1441 void pci_acpi_setup(struct device *dev, struct acpi_device *adev)
1443 struct pci_dev *pci_dev = to_pci_dev(dev);
1445 pci_acpi_optimize_delay(pci_dev, adev->handle);
1446 pci_acpi_set_external_facing(pci_dev);
1447 pci_acpi_add_edr_notifier(pci_dev);
1449 pci_acpi_add_pm_notifier(adev, pci_dev);
1450 if (!adev->wakeup.flags.valid)
1453 device_set_wakeup_capable(dev, true);
1455 * For bridges that can do D3 we enable wake automatically (as
1456 * we do for the power management itself in that case). The
1457 * reason is that the bridge may have additional methods such as
1458 * _DSW that need to be called.
1460 if (pci_dev->bridge_d3)
1461 device_wakeup_enable(dev);
1463 acpi_pci_wakeup(pci_dev, false);
1464 acpi_device_power_add_dependent(adev, dev);
1466 if (pci_is_bridge(pci_dev))
1467 acpi_dev_power_up_children_with_adr(adev);
1470 void pci_acpi_cleanup(struct device *dev, struct acpi_device *adev)
1472 struct pci_dev *pci_dev = to_pci_dev(dev);
1474 pci_acpi_remove_edr_notifier(pci_dev);
1475 pci_acpi_remove_pm_notifier(adev);
1476 if (adev->wakeup.flags.valid) {
1477 acpi_device_power_remove_dependent(adev, dev);
1478 if (pci_dev->bridge_d3)
1479 device_wakeup_disable(dev);
1481 device_set_wakeup_capable(dev, false);
1485 static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
1488 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
1489 * @fn: Callback matching a device to a fwnode that identifies a PCI
1492 * This should be called by irqchip driver, which is the parent of
1493 * the MSI domain to provide callback interface to query fwnode.
1496 pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
1498 pci_msi_get_fwnode_cb = fn;
1502 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
1503 * @bus: The PCI host bridge bus.
1505 * This function uses the callback function registered by
1506 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
1507 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
1508 * This returns NULL on error or when the domain is not found.
1510 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
1512 struct fwnode_handle *fwnode;
1514 if (!pci_msi_get_fwnode_cb)
1517 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
1521 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
1524 static int __init acpi_pci_init(void)
1526 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
1527 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
1531 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
1532 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
1536 if (acpi_pci_disabled)
1539 acpi_pci_slot_init();
1544 arch_initcall(acpi_pci_init);
1546 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
1549 * Try to assign the IRQ number when probing a new device
1551 int pcibios_alloc_irq(struct pci_dev *dev)
1554 acpi_pci_irq_enable(dev);
1559 struct acpi_pci_generic_root_info {
1560 struct acpi_pci_root_info common;
1561 struct pci_config_window *cfg; /* config space mapping */
1564 int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
1566 struct pci_config_window *cfg = bus->sysdata;
1567 struct acpi_device *adev = to_acpi_device(cfg->parent);
1568 struct acpi_pci_root *root = acpi_driver_data(adev);
1570 return root->segment;
1573 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1575 struct pci_config_window *cfg;
1576 struct acpi_device *adev;
1577 struct device *bus_dev;
1582 cfg = bridge->bus->sysdata;
1585 * On Hyper-V there is no corresponding ACPI device for a root bridge,
1586 * therefore ->parent is set as NULL by the driver. And set 'adev' as
1587 * NULL in this case because there is no proper ACPI device.
1592 adev = to_acpi_device(cfg->parent);
1594 bus_dev = &bridge->bus->dev;
1596 ACPI_COMPANION_SET(&bridge->dev, adev);
1597 set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
1602 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
1604 struct resource_entry *entry, *tmp;
1607 status = acpi_pci_probe_root_resources(ci);
1608 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
1609 if (!(entry->res->flags & IORESOURCE_WINDOW))
1610 resource_list_destroy_entry(entry);
1616 * Lookup the bus range for the domain in MCFG, and set up config space
1619 static struct pci_config_window *
1620 pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
1622 struct device *dev = &root->device->dev;
1623 struct resource *bus_res = &root->secondary;
1624 u16 seg = root->segment;
1625 const struct pci_ecam_ops *ecam_ops;
1626 struct resource cfgres;
1627 struct acpi_device *adev;
1628 struct pci_config_window *cfg;
1631 ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
1633 dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
1637 adev = acpi_resource_consumer(&cfgres);
1639 dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
1640 dev_name(&adev->dev));
1642 dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
1645 cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
1647 dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
1655 /* release_info: free resources allocated by init_info */
1656 static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
1658 struct acpi_pci_generic_root_info *ri;
1660 ri = container_of(ci, struct acpi_pci_generic_root_info, common);
1661 pci_ecam_free(ri->cfg);
1666 /* Interface called from ACPI code to setup PCI host controller */
1667 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
1669 struct acpi_pci_generic_root_info *ri;
1670 struct pci_bus *bus, *child;
1671 struct acpi_pci_root_ops *root_ops;
1672 struct pci_host_bridge *host;
1674 ri = kzalloc(sizeof(*ri), GFP_KERNEL);
1678 root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
1684 ri->cfg = pci_acpi_setup_ecam_mapping(root);
1691 root_ops->release_info = pci_acpi_generic_release_info;
1692 root_ops->prepare_resources = pci_acpi_root_prepare_resources;
1693 root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
1694 bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
1698 /* If we must preserve the resource configuration, claim now */
1699 host = pci_find_host_bridge(bus);
1700 if (host->preserve_config)
1701 pci_bus_claim_resources(bus);
1704 * Assign whatever was left unassigned. If we didn't claim above,
1705 * this will reassign everything.
1707 pci_assign_unassigned_root_bus_resources(bus);
1709 list_for_each_entry(child, &bus->children, node)
1710 pcie_bus_configure_settings(child);
1715 void pcibios_add_bus(struct pci_bus *bus)
1717 acpi_pci_add_bus(bus);
1720 void pcibios_remove_bus(struct pci_bus *bus)
1722 acpi_pci_remove_bus(bus);