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-aspm.h>
18 #include <linux/pci-acpi.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/pm_qos.h>
24 * The GUID is defined in the PCI Firmware Specification available here:
25 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
27 const guid_t pci_acpi_dsm_guid =
28 GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
29 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
31 #if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
32 static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
34 struct device *dev = &adev->dev;
35 struct resource_entry *entry;
36 struct list_head list;
40 INIT_LIST_HEAD(&list);
41 flags = IORESOURCE_MEM;
42 ret = acpi_dev_get_resources(adev, &list,
43 acpi_dev_filter_resource_type_cb,
46 dev_err(dev, "failed to parse _CRS method, error code %d\n",
52 dev_err(dev, "no IO and memory resources present in _CRS\n");
56 entry = list_first_entry(&list, struct resource_entry, node);
58 acpi_dev_free_resource_list(&list);
62 static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
65 u16 *segment = context;
66 unsigned long long uid;
69 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
70 if (ACPI_FAILURE(status) || uid != *segment)
73 *(acpi_handle *)retval = handle;
74 return AE_CTRL_TERMINATE;
77 int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
80 struct acpi_device *adev;
85 status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
86 if (ACPI_FAILURE(status)) {
87 dev_err(dev, "can't find _HID %s device to locate resources\n",
92 ret = acpi_bus_get_device(handle, &adev);
96 ret = acpi_get_rc_addr(adev, res);
98 dev_err(dev, "can't get resource from %s\n",
99 dev_name(&adev->dev));
107 phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
109 acpi_status status = AE_NOT_EXIST;
110 unsigned long long mcfg_addr;
113 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
115 if (ACPI_FAILURE(status))
118 return (phys_addr_t)mcfg_addr;
121 static acpi_status decode_type0_hpx_record(union acpi_object *record,
122 struct hotplug_params *hpx)
125 union acpi_object *fields = record->package.elements;
126 u32 revision = fields[1].integer.value;
130 if (record->package.count != 6)
132 for (i = 2; i < 6; i++)
133 if (fields[i].type != ACPI_TYPE_INTEGER)
135 hpx->t0 = &hpx->type0_data;
136 hpx->t0->revision = revision;
137 hpx->t0->cache_line_size = fields[2].integer.value;
138 hpx->t0->latency_timer = fields[3].integer.value;
139 hpx->t0->enable_serr = fields[4].integer.value;
140 hpx->t0->enable_perr = fields[5].integer.value;
144 "%s: Type 0 Revision %d record not supported\n",
151 static acpi_status decode_type1_hpx_record(union acpi_object *record,
152 struct hotplug_params *hpx)
155 union acpi_object *fields = record->package.elements;
156 u32 revision = fields[1].integer.value;
160 if (record->package.count != 5)
162 for (i = 2; i < 5; i++)
163 if (fields[i].type != ACPI_TYPE_INTEGER)
165 hpx->t1 = &hpx->type1_data;
166 hpx->t1->revision = revision;
167 hpx->t1->max_mem_read = fields[2].integer.value;
168 hpx->t1->avg_max_split = fields[3].integer.value;
169 hpx->t1->tot_max_split = fields[4].integer.value;
173 "%s: Type 1 Revision %d record not supported\n",
180 static acpi_status decode_type2_hpx_record(union acpi_object *record,
181 struct hotplug_params *hpx)
184 union acpi_object *fields = record->package.elements;
185 u32 revision = fields[1].integer.value;
189 if (record->package.count != 18)
191 for (i = 2; i < 18; i++)
192 if (fields[i].type != ACPI_TYPE_INTEGER)
194 hpx->t2 = &hpx->type2_data;
195 hpx->t2->revision = revision;
196 hpx->t2->unc_err_mask_and = fields[2].integer.value;
197 hpx->t2->unc_err_mask_or = fields[3].integer.value;
198 hpx->t2->unc_err_sever_and = fields[4].integer.value;
199 hpx->t2->unc_err_sever_or = fields[5].integer.value;
200 hpx->t2->cor_err_mask_and = fields[6].integer.value;
201 hpx->t2->cor_err_mask_or = fields[7].integer.value;
202 hpx->t2->adv_err_cap_and = fields[8].integer.value;
203 hpx->t2->adv_err_cap_or = fields[9].integer.value;
204 hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
205 hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
206 hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
207 hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
208 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
209 hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
210 hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
211 hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
215 "%s: Type 2 Revision %d record not supported\n",
222 static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
225 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
226 union acpi_object *package, *record, *fields;
230 /* Clear the return buffer with zeros */
231 memset(hpx, 0, sizeof(struct hotplug_params));
233 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
234 if (ACPI_FAILURE(status))
237 package = (union acpi_object *)buffer.pointer;
238 if (package->type != ACPI_TYPE_PACKAGE) {
243 for (i = 0; i < package->package.count; i++) {
244 record = &package->package.elements[i];
245 if (record->type != ACPI_TYPE_PACKAGE) {
250 fields = record->package.elements;
251 if (fields[0].type != ACPI_TYPE_INTEGER ||
252 fields[1].type != ACPI_TYPE_INTEGER) {
257 type = fields[0].integer.value;
260 status = decode_type0_hpx_record(record, hpx);
261 if (ACPI_FAILURE(status))
265 status = decode_type1_hpx_record(record, hpx);
266 if (ACPI_FAILURE(status))
270 status = decode_type2_hpx_record(record, hpx);
271 if (ACPI_FAILURE(status))
275 printk(KERN_ERR "%s: Type %d record not supported\n",
282 kfree(buffer.pointer);
286 static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
289 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
290 union acpi_object *package, *fields;
293 memset(hpp, 0, sizeof(struct hotplug_params));
295 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
296 if (ACPI_FAILURE(status))
299 package = (union acpi_object *) buffer.pointer;
300 if (package->type != ACPI_TYPE_PACKAGE ||
301 package->package.count != 4) {
306 fields = package->package.elements;
307 for (i = 0; i < 4; i++) {
308 if (fields[i].type != ACPI_TYPE_INTEGER) {
314 hpp->t0 = &hpp->type0_data;
315 hpp->t0->revision = 1;
316 hpp->t0->cache_line_size = fields[0].integer.value;
317 hpp->t0->latency_timer = fields[1].integer.value;
318 hpp->t0->enable_serr = fields[2].integer.value;
319 hpp->t0->enable_perr = fields[3].integer.value;
322 kfree(buffer.pointer);
328 * @dev - the pci_dev for which we want parameters
329 * @hpp - allocated by the caller
331 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
334 acpi_handle handle, phandle;
335 struct pci_bus *pbus;
337 if (acpi_pci_disabled)
341 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
342 handle = acpi_pci_get_bridge_handle(pbus);
348 * _HPP settings apply to all child buses, until another _HPP is
349 * encountered. If we don't find an _HPP for the input pci dev,
350 * look for it in the parent device scope since that would apply to
354 status = acpi_run_hpx(handle, hpp);
355 if (ACPI_SUCCESS(status))
357 status = acpi_run_hpp(handle, hpp);
358 if (ACPI_SUCCESS(status))
360 if (acpi_is_root_bridge(handle))
362 status = acpi_get_parent(handle, &phandle);
363 if (ACPI_FAILURE(status))
369 EXPORT_SYMBOL_GPL(pci_get_hp_params);
372 * pciehp_is_native - Check whether a hotplug port is handled by the OS
373 * @bridge: Hotplug port to check
375 * Returns true if the given @bridge is handled by the native PCIe hotplug
378 bool pciehp_is_native(struct pci_dev *bridge)
380 const struct pci_host_bridge *host;
383 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
386 pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
387 if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
390 if (pcie_ports_native)
393 host = pci_find_host_bridge(bridge->bus);
394 return host->native_pcie_hotplug;
398 * shpchp_is_native - Check whether a hotplug port is handled by the OS
399 * @bridge: Hotplug port to check
401 * Returns true if the given @bridge is handled by the native SHPC hotplug
404 bool shpchp_is_native(struct pci_dev *bridge)
406 const struct pci_host_bridge *host;
408 if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
412 * It is assumed that AMD GOLAM chips support SHPC but they do not
413 * have SHPC capability.
415 if (bridge->vendor == PCI_VENDOR_ID_AMD &&
416 bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
419 if (!pci_find_capability(bridge, PCI_CAP_ID_SHPC))
422 host = pci_find_host_bridge(bridge->bus);
423 return host->native_shpc_hotplug;
427 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
428 * @context: Device wakeup context.
430 static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
432 struct acpi_device *adev;
433 struct acpi_pci_root *root;
435 adev = container_of(context, struct acpi_device, wakeup.context);
436 root = acpi_driver_data(adev);
437 pci_pme_wakeup_bus(root->bus);
441 * pci_acpi_wake_dev - PCI device wakeup notification work function.
442 * @context: Device wakeup context.
444 static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
446 struct pci_dev *pci_dev;
448 pci_dev = to_pci_dev(context->dev);
450 if (pci_dev->pme_poll)
451 pci_dev->pme_poll = false;
453 if (pci_dev->current_state == PCI_D3cold) {
454 pci_wakeup_event(pci_dev);
455 pm_request_resume(&pci_dev->dev);
459 /* Clear PME Status if set. */
460 if (pci_dev->pme_support)
461 pci_check_pme_status(pci_dev);
463 pci_wakeup_event(pci_dev);
464 pm_request_resume(&pci_dev->dev);
466 pci_pme_wakeup_bus(pci_dev->subordinate);
470 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
471 * @dev: PCI root bridge ACPI device.
473 acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
475 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
479 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
480 * @dev: ACPI device to add the notifier for.
481 * @pci_dev: PCI device to check for the PME status if an event is signaled.
483 acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
484 struct pci_dev *pci_dev)
486 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
490 * _SxD returns the D-state with the highest power
491 * (lowest D-state number) supported in the S-state "x".
493 * If the devices does not have a _PRW
494 * (Power Resources for Wake) supporting system wakeup from "x"
495 * then the OS is free to choose a lower power (higher number
496 * D-state) than the return value from _SxD.
498 * But if _PRW is enabled at S-state "x", the OS
499 * must not choose a power lower than _SxD --
500 * unless the device has an _SxW method specifying
501 * the lowest power (highest D-state number) the device
502 * may enter while still able to wake the system.
504 * ie. depending on global OS policy:
506 * if (_PRW at S-state x)
507 * choose from highest power _SxD to lowest power _SxW
508 * else // no _PRW at S-state x
509 * choose highest power _SxD or any lower power
512 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
514 int acpi_state, d_max;
517 d_max = ACPI_STATE_D3_HOT;
519 d_max = ACPI_STATE_D3_COLD;
520 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
522 return PCI_POWER_ERROR;
524 switch (acpi_state) {
531 case ACPI_STATE_D3_HOT:
533 case ACPI_STATE_D3_COLD:
536 return PCI_POWER_ERROR;
539 static bool acpi_pci_power_manageable(struct pci_dev *dev)
541 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
542 return adev ? acpi_device_power_manageable(adev) : false;
545 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
547 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
548 static const u8 state_conv[] = {
549 [PCI_D0] = ACPI_STATE_D0,
550 [PCI_D1] = ACPI_STATE_D1,
551 [PCI_D2] = ACPI_STATE_D2,
552 [PCI_D3hot] = ACPI_STATE_D3_HOT,
553 [PCI_D3cold] = ACPI_STATE_D3_COLD,
557 /* If the ACPI device has _EJ0, ignore the device */
558 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
563 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
572 error = acpi_device_set_power(adev, state_conv[state]);
576 pci_dbg(dev, "power state changed by ACPI to %s\n",
577 acpi_power_state_string(state_conv[state]));
582 static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
584 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
585 static const pci_power_t state_conv[] = {
586 [ACPI_STATE_D0] = PCI_D0,
587 [ACPI_STATE_D1] = PCI_D1,
588 [ACPI_STATE_D2] = PCI_D2,
589 [ACPI_STATE_D3_HOT] = PCI_D3hot,
590 [ACPI_STATE_D3_COLD] = PCI_D3cold,
594 if (!adev || !acpi_device_power_manageable(adev))
597 if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN)
600 return state_conv[state];
603 static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
605 while (bus->parent) {
606 if (acpi_pm_device_can_wakeup(&bus->self->dev))
607 return acpi_pm_set_bridge_wakeup(&bus->self->dev, enable);
612 /* We have reached the root bus. */
614 if (acpi_pm_device_can_wakeup(bus->bridge))
615 return acpi_pm_set_bridge_wakeup(bus->bridge, enable);
620 static int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
622 if (acpi_pm_device_can_wakeup(&dev->dev))
623 return acpi_pm_set_device_wakeup(&dev->dev, enable);
625 return acpi_pci_propagate_wakeup(dev->bus, enable);
628 static bool acpi_pci_need_resume(struct pci_dev *dev)
630 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
632 if (!adev || !acpi_device_power_manageable(adev))
635 if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
638 if (acpi_target_system_state() == ACPI_STATE_S0)
641 return !!adev->power.flags.dsw_present;
644 static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
645 .is_manageable = acpi_pci_power_manageable,
646 .set_state = acpi_pci_set_power_state,
647 .get_state = acpi_pci_get_power_state,
648 .choose_state = acpi_pci_choose_state,
649 .set_wakeup = acpi_pci_wakeup,
650 .need_resume = acpi_pci_need_resume,
653 void acpi_pci_add_bus(struct pci_bus *bus)
655 union acpi_object *obj;
656 struct pci_host_bridge *bridge;
658 if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
661 acpi_pci_slot_enumerate(bus);
662 acpiphp_enumerate_slots(bus);
665 * For a host bridge, check its _DSM for function 8 and if
666 * that is available, mark it in pci_host_bridge.
668 if (!pci_is_root_bus(bus))
671 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
672 RESET_DELAY_DSM, NULL);
676 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
677 bridge = pci_find_host_bridge(bus);
678 bridge->ignore_reset_delay = 1;
683 void acpi_pci_remove_bus(struct pci_bus *bus)
685 if (acpi_pci_disabled || !bus->bridge)
688 acpiphp_remove_slots(bus);
689 acpi_pci_slot_remove(bus);
693 static struct acpi_device *acpi_pci_find_companion(struct device *dev)
695 struct pci_dev *pci_dev = to_pci_dev(dev);
699 check_children = pci_is_bridge(pci_dev);
700 /* Please ref to ACPI spec for the syntax of _ADR */
701 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
702 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
707 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
708 * @pdev: the PCI device whose delay is to be updated
709 * @handle: ACPI handle of this device
711 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
712 * control method of either the device itself or the PCI host bridge.
714 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
715 * host bridge. If it returns one, the OS may assume that all devices in
716 * the hierarchy have already completed power-on reset delays.
718 * Function 9, "Device Readiness Durations," applies only to the object
719 * where it is located. It returns delay durations required after various
720 * events if the device requires less time than the spec requires. Delays
721 * from this function take precedence over the Reset Delay function.
723 * These _DSM functions are defined by the draft ECN of January 28, 2014,
724 * titled "ACPI additions for FW latency optimizations."
726 static void pci_acpi_optimize_delay(struct pci_dev *pdev,
729 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
731 union acpi_object *obj, *elements;
733 if (bridge->ignore_reset_delay)
734 pdev->d3cold_delay = 0;
736 obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
737 FUNCTION_DELAY_DSM, NULL);
741 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
742 elements = obj->package.elements;
743 if (elements[0].type == ACPI_TYPE_INTEGER) {
744 value = (int)elements[0].integer.value / 1000;
745 if (value < PCI_PM_D3COLD_WAIT)
746 pdev->d3cold_delay = value;
748 if (elements[3].type == ACPI_TYPE_INTEGER) {
749 value = (int)elements[3].integer.value / 1000;
750 if (value < PCI_PM_D3_WAIT)
751 pdev->d3_delay = value;
757 static void pci_acpi_setup(struct device *dev)
759 struct pci_dev *pci_dev = to_pci_dev(dev);
760 struct acpi_device *adev = ACPI_COMPANION(dev);
765 pci_acpi_optimize_delay(pci_dev, adev->handle);
767 pci_acpi_add_pm_notifier(adev, pci_dev);
768 if (!adev->wakeup.flags.valid)
771 device_set_wakeup_capable(dev, true);
772 acpi_pci_wakeup(pci_dev, false);
775 static void pci_acpi_cleanup(struct device *dev)
777 struct acpi_device *adev = ACPI_COMPANION(dev);
782 pci_acpi_remove_pm_notifier(adev);
783 if (adev->wakeup.flags.valid)
784 device_set_wakeup_capable(dev, false);
787 static bool pci_acpi_bus_match(struct device *dev)
789 return dev_is_pci(dev);
792 static struct acpi_bus_type acpi_pci_bus = {
794 .match = pci_acpi_bus_match,
795 .find_companion = acpi_pci_find_companion,
796 .setup = pci_acpi_setup,
797 .cleanup = pci_acpi_cleanup,
801 static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
804 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
805 * @fn: Callback matching a device to a fwnode that identifies a PCI
808 * This should be called by irqchip driver, which is the parent of
809 * the MSI domain to provide callback interface to query fwnode.
812 pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
814 pci_msi_get_fwnode_cb = fn;
818 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
819 * @bus: The PCI host bridge bus.
821 * This function uses the callback function registered by
822 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
823 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
824 * This returns NULL on error or when the domain is not found.
826 struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
828 struct fwnode_handle *fwnode;
830 if (!pci_msi_get_fwnode_cb)
833 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
837 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
840 static int __init acpi_pci_init(void)
844 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
845 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
849 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
850 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
854 ret = register_acpi_bus_type(&acpi_pci_bus);
858 pci_set_platform_pm(&acpi_pci_platform_pm);
859 acpi_pci_slot_init();
864 arch_initcall(acpi_pci_init);