/* * File: pci-acpi.c * Purpose: Provide PCI support in ACPI * * Copyright (C) 2005 David Shaohua Li * Copyright (C) 2004 Tom Long Nguyen * Copyright (C) 2004 Intel Corp. */ #include #include #include #include #include #include #include #include #include #include #include "pci.h" /** * pci_acpi_wake_bus - Wake-up notification handler for root buses. * @handle: ACPI handle of a device the notification is for. * @event: Type of the signaled event. * @context: PCI root bus to wake up devices on. */ static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context) { struct pci_bus *pci_bus = context; if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus) pci_pme_wakeup_bus(pci_bus); } /** * pci_acpi_wake_dev - Wake-up notification handler for PCI devices. * @handle: ACPI handle of a device the notification is for. * @event: Type of the signaled event. * @context: PCI device object to wake up. */ static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context) { struct pci_dev *pci_dev = context; if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev) return; if (pci_dev->pme_poll) pci_dev->pme_poll = false; if (pci_dev->current_state == PCI_D3cold) { pci_wakeup_event(pci_dev); pm_runtime_resume(&pci_dev->dev); return; } /* Clear PME Status if set. */ if (pci_dev->pme_support) pci_check_pme_status(pci_dev); pci_wakeup_event(pci_dev); pm_runtime_resume(&pci_dev->dev); if (pci_dev->subordinate) pci_pme_wakeup_bus(pci_dev->subordinate); } /** * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus. * @dev: ACPI device to add the notifier for. * @pci_bus: PCI bus to walk checking for PME status if an event is signaled. */ acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev, struct pci_bus *pci_bus) { return acpi_add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus); } /** * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier. * @dev: ACPI device to remove the notifier from. */ acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev) { return acpi_remove_pm_notifier(dev, pci_acpi_wake_bus); } /** * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device. * @dev: ACPI device to add the notifier for. * @pci_dev: PCI device to check for the PME status if an event is signaled. */ acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev, struct pci_dev *pci_dev) { return acpi_add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev); } /** * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier. * @dev: ACPI device to remove the notifier from. */ acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) { return acpi_remove_pm_notifier(dev, pci_acpi_wake_dev); } phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) { acpi_status status = AE_NOT_EXIST; unsigned long long mcfg_addr; if (handle) status = acpi_evaluate_integer(handle, METHOD_NAME__CBA, NULL, &mcfg_addr); if (ACPI_FAILURE(status)) return 0; return (phys_addr_t)mcfg_addr; } /* * _SxD returns the D-state with the highest power * (lowest D-state number) supported in the S-state "x". * * If the devices does not have a _PRW * (Power Resources for Wake) supporting system wakeup from "x" * then the OS is free to choose a lower power (higher number * D-state) than the return value from _SxD. * * But if _PRW is enabled at S-state "x", the OS * must not choose a power lower than _SxD -- * unless the device has an _SxW method specifying * the lowest power (highest D-state number) the device * may enter while still able to wake the system. * * ie. depending on global OS policy: * * if (_PRW at S-state x) * choose from highest power _SxD to lowest power _SxW * else // no _PRW at S-state x * choose highest power _SxD or any lower power */ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) { int acpi_state, d_max; if (pdev->no_d3cold) d_max = ACPI_STATE_D3_HOT; else d_max = ACPI_STATE_D3_COLD; acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max); if (acpi_state < 0) return PCI_POWER_ERROR; switch (acpi_state) { case ACPI_STATE_D0: return PCI_D0; case ACPI_STATE_D1: return PCI_D1; case ACPI_STATE_D2: return PCI_D2; case ACPI_STATE_D3_HOT: return PCI_D3hot; case ACPI_STATE_D3_COLD: return PCI_D3cold; } return PCI_POWER_ERROR; } static bool acpi_pci_power_manageable(struct pci_dev *dev) { acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); return handle ? acpi_bus_power_manageable(handle) : false; } static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) { acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); static const u8 state_conv[] = { [PCI_D0] = ACPI_STATE_D0, [PCI_D1] = ACPI_STATE_D1, [PCI_D2] = ACPI_STATE_D2, [PCI_D3hot] = ACPI_STATE_D3_COLD, [PCI_D3cold] = ACPI_STATE_D3_COLD, }; int error = -EINVAL; /* If the ACPI device has _EJ0, ignore the device */ if (!handle || acpi_has_method(handle, "_EJ0")) return -ENODEV; switch (state) { case PCI_D3cold: if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) == PM_QOS_FLAGS_ALL) { error = -EBUSY; break; } case PCI_D0: case PCI_D1: case PCI_D2: case PCI_D3hot: error = acpi_bus_set_power(handle, state_conv[state]); } if (!error) dev_dbg(&dev->dev, "power state changed by ACPI to %s\n", acpi_power_state_string(state_conv[state])); return error; } static bool acpi_pci_can_wakeup(struct pci_dev *dev) { acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); return handle ? acpi_bus_can_wakeup(handle) : false; } static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable) { while (bus->parent) { if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable)) return; bus = bus->parent; } /* We have reached the root bus. */ if (bus->bridge) acpi_pm_device_sleep_wake(bus->bridge, enable); } static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) { if (acpi_pci_can_wakeup(dev)) return acpi_pm_device_sleep_wake(&dev->dev, enable); acpi_pci_propagate_wakeup_enable(dev->bus, enable); return 0; } static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable) { while (bus->parent) { struct pci_dev *bridge = bus->self; if (bridge->pme_interrupt) return; if (!acpi_pm_device_run_wake(&bridge->dev, enable)) return; bus = bus->parent; } /* We have reached the root bus. */ if (bus->bridge) acpi_pm_device_run_wake(bus->bridge, enable); } static int acpi_pci_run_wake(struct pci_dev *dev, bool enable) { /* * Per PCI Express Base Specification Revision 2.0 section * 5.3.3.2 Link Wakeup, platform support is needed for D3cold * waking up to power on the main link even if there is PME * support for D3cold */ if (dev->pme_interrupt && !dev->runtime_d3cold) return 0; if (!acpi_pm_device_run_wake(&dev->dev, enable)) return 0; acpi_pci_propagate_run_wake(dev->bus, enable); return 0; } static struct pci_platform_pm_ops acpi_pci_platform_pm = { .is_manageable = acpi_pci_power_manageable, .set_state = acpi_pci_set_power_state, .choose_state = acpi_pci_choose_state, .sleep_wake = acpi_pci_sleep_wake, .run_wake = acpi_pci_run_wake, }; void acpi_pci_add_bus(struct pci_bus *bus) { if (acpi_pci_disabled || !bus->bridge) return; acpi_pci_slot_enumerate(bus); acpiphp_enumerate_slots(bus); } void acpi_pci_remove_bus(struct pci_bus *bus) { if (acpi_pci_disabled || !bus->bridge) return; acpiphp_remove_slots(bus); acpi_pci_slot_remove(bus); } /* ACPI bus type */ static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) { struct pci_dev *pci_dev = to_pci_dev(dev); bool is_bridge; u64 addr; /* * pci_is_bridge() is not suitable here, because pci_dev->subordinate * is set only after acpi_pci_find_device() has been called for the * given device. */ is_bridge = pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || pci_dev->hdr_type == PCI_HEADER_TYPE_CARDBUS; /* Please ref to ACPI spec for the syntax of _ADR */ addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); *handle = acpi_find_child(ACPI_HANDLE(dev->parent), addr, is_bridge); if (!*handle) return -ENODEV; return 0; } static void pci_acpi_setup(struct device *dev) { struct pci_dev *pci_dev = to_pci_dev(dev); acpi_handle handle = ACPI_HANDLE(dev); struct acpi_device *adev; if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid) return; device_set_wakeup_capable(dev, true); acpi_pci_sleep_wake(pci_dev, false); pci_acpi_add_pm_notifier(adev, pci_dev); if (adev->wakeup.flags.run_wake) device_set_run_wake(dev, true); } static void pci_acpi_cleanup(struct device *dev) { acpi_handle handle = ACPI_HANDLE(dev); struct acpi_device *adev; if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) { device_set_wakeup_capable(dev, false); device_set_run_wake(dev, false); pci_acpi_remove_pm_notifier(adev); } } static bool pci_acpi_bus_match(struct device *dev) { return dev->bus == &pci_bus_type; } static struct acpi_bus_type acpi_pci_bus = { .name = "PCI", .match = pci_acpi_bus_match, .find_device = acpi_pci_find_device, .setup = pci_acpi_setup, .cleanup = pci_acpi_cleanup, }; static int __init acpi_pci_init(void) { int ret; if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) { pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n"); pci_no_msi(); } if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); pcie_no_aspm(); } ret = register_acpi_bus_type(&acpi_pci_bus); if (ret) return 0; pci_set_platform_pm(&acpi_pci_platform_pm); acpi_pci_slot_init(); acpiphp_init(); return 0; } arch_initcall(acpi_pci_init);