[mirror_ubuntu-bionic-kernel.git] / drivers / pci / pci-acpi.c

/*
 * File:	pci-acpi.c
 * Purpose:	Provide PCI support in ACPI
 *
 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
 * Copyright (C) 2004 Intel Corp.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/pci-aspm.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>

#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#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->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);

	if (pci_dev->pme_poll)
		pci_dev->pme_poll = false;

	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);
	acpi_handle tmp;
	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_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
		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_info(&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)
{
	acpi_handle handle = NULL;

	if (bus->bridge)
		handle = ACPI_HANDLE(bus->bridge);
	if (acpi_pci_disabled || handle == NULL)
		return;

	acpi_pci_slot_enumerate(bus, handle);
	acpiphp_enumerate_slots(bus, handle);
}

void acpi_pci_remove_bus(struct pci_bus *bus)
{
	/*
	 * bus->bridge->acpi_node.handle has already been reset to NULL
	 * when acpi_pci_remove_bus() is called, so don't check ACPI handle.
	 */
	if (acpi_pci_disabled)
		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;
	u64	addr;

	pci_dev = to_pci_dev(dev);
	/* Please ref to ACPI spec for the syntax of _ADR */
	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	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);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* File: pci-acpi.c
a406d9e6	3	* Purpose: Provide PCI support in ACPI
1da177e4	4	*
84df749f DSL	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.
1da177e4 LT	8	*/
	9
	10	#include <linux/delay.h>
	11	#include <linux/init.h>
	12	#include <linux/pci.h>
	13	#include <linux/module.h>
5fde244d	14	#include <linux/pci-aspm.h>
1da177e4	15	#include <acpi/acpi.h>
1da177e4 LT	16	#include <acpi/acpi_bus.h>
	17
	18	#include <linux/pci-acpi.h>
b67ea761	19	#include <linux/pm_runtime.h>
8b713a88	20	#include <linux/pm_qos.h>
0f64474b	21	#include "pci.h"
1da177e4	22
b67ea761 RW	23	/**
	24	* pci_acpi_wake_bus - Wake-up notification handler for root buses.
	25	* @handle: ACPI handle of a device the notification is for.
	26	* @event: Type of the signaled event.
	27	* @context: PCI root bus to wake up devices on.
	28	*/
	29	static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
	30	{
	31	struct pci_bus *pci_bus = context;
	32
	33	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
	34	pci_pme_wakeup_bus(pci_bus);
	35	}
	36
	37	/**
	38	* pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
	39	* @handle: ACPI handle of a device the notification is for.
	40	* @event: Type of the signaled event.
	41	* @context: PCI device object to wake up.
	42	*/
	43	static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
	44	{
	45	struct pci_dev *pci_dev = context;
	46
a424948d RW	47	if (event != ACPI_NOTIFY_DEVICE_WAKE \|\| !pci_dev)
	48	return;
	49
448bd857 HY	50	if (pci_dev->current_state == PCI_D3cold) {
	51	pci_wakeup_event(pci_dev);
	52	pm_runtime_resume(&pci_dev->dev);
	53	return;
	54	}
	55
24ad0ef9 RW	56	/* Clear PME Status if set. */
	57	if (pci_dev->pme_support)
	58	pci_check_pme_status(pci_dev);
379021d5	59
24ad0ef9 RW	60	if (pci_dev->pme_poll)
	61	pci_dev->pme_poll = false;
	62
	63	pci_wakeup_event(pci_dev);
	64	pm_runtime_resume(&pci_dev->dev);
a424948d RW	65
	66	if (pci_dev->subordinate)
	67	pci_pme_wakeup_bus(pci_dev->subordinate);
b67ea761 RW	68	}
b67ea761 RW	69
b67ea761 RW	70	/**
	71	* pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
	72	* @dev: ACPI device to add the notifier for.
	73	* @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
	74	*/
	75	acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
	76	struct pci_bus *pci_bus)
	77	{
ec2cd81c	78	return acpi_add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
b67ea761 RW	79	}
	80
	81	/**
	82	* pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
	83	* @dev: ACPI device to remove the notifier from.
	84	*/
	85	acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
	86	{
ec2cd81c	87	return acpi_remove_pm_notifier(dev, pci_acpi_wake_bus);
b67ea761 RW	88	}
	89
	90	/**
	91	* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
	92	* @dev: ACPI device to add the notifier for.
	93	* @pci_dev: PCI device to check for the PME status if an event is signaled.
	94	*/
	95	acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
	96	struct pci_dev *pci_dev)
	97	{
ec2cd81c	98	return acpi_add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
b67ea761 RW	99	}
	100
	101	/**
	102	* pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
	103	* @dev: ACPI device to remove the notifier from.
	104	*/
	105	acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
	106	{
ec2cd81c	107	return acpi_remove_pm_notifier(dev, pci_acpi_wake_dev);
b67ea761 RW	108	}
b67ea761 RW	109
f4b57a3b JL	110	phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
	111	{
	112	acpi_status status = AE_NOT_EXIST;
	113	unsigned long long mcfg_addr;
	114
	115	if (handle)
	116	status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
	117	NULL, &mcfg_addr);
	118	if (ACPI_FAILURE(status))
	119	return 0;
	120
	121	return (phys_addr_t)mcfg_addr;
	122	}
	123
0f64474b DSL	124	/*
	125	* _SxD returns the D-state with the highest power
	126	* (lowest D-state number) supported in the S-state "x".
	127	*
	128	* If the devices does not have a _PRW
	129	* (Power Resources for Wake) supporting system wakeup from "x"
	130	* then the OS is free to choose a lower power (higher number
	131	* D-state) than the return value from _SxD.
	132	*
	133	* But if _PRW is enabled at S-state "x", the OS
	134	* must not choose a power lower than _SxD --
	135	* unless the device has an _SxW method specifying
	136	* the lowest power (highest D-state number) the device
	137	* may enter while still able to wake the system.
	138	*
	139	* ie. depending on global OS policy:
	140	*
	141	* if (_PRW at S-state x)
	142	* choose from highest power _SxD to lowest power _SxW
	143	* else // no _PRW at S-state x
	144	* choose highest power _SxD or any lower power
0f64474b DSL	145	*/
0f64474b DSL	146
8d2bdf49	147	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	148	{
448bd857	149	int acpi_state, d_max;
0f64474b	150
448bd857 HY	151	if (pdev->no_d3cold)
	152	d_max = ACPI_STATE_D3_HOT;
	153	else
	154	d_max = ACPI_STATE_D3_COLD;
	155	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
ab826ca4 SL	156	if (acpi_state < 0)
	157	return PCI_POWER_ERROR;
	158
	159	switch (acpi_state) {
	160	case ACPI_STATE_D0:
	161	return PCI_D0;
	162	case ACPI_STATE_D1:
	163	return PCI_D1;
	164	case ACPI_STATE_D2:
	165	return PCI_D2;
1cc0c998	166	case ACPI_STATE_D3_HOT:
ab826ca4	167	return PCI_D3hot;
28c2103d LM	168	case ACPI_STATE_D3_COLD:
28c2103d LM	169	return PCI_D3cold;
ab826ca4 SL	170	}
ab826ca4 SL	171	return PCI_POWER_ERROR;
0f64474b	172	}
961d9120 RW	173
	174	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	175	{
	176	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	177
	178	return handle ? acpi_bus_power_manageable(handle) : false;
	179	}
0f64474b	180
b913100d DSL	181	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	182	{
	183	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	184	acpi_handle tmp;
583c377f DB	185	static const u8 state_conv[] = {
	186	[PCI_D0] = ACPI_STATE_D0,
	187	[PCI_D1] = ACPI_STATE_D1,
	188	[PCI_D2] = ACPI_STATE_D2,
fc6504b3 RW	189	[PCI_D3hot] = ACPI_STATE_D3_COLD,
fc6504b3 RW	190	[PCI_D3cold] = ACPI_STATE_D3_COLD,
b913100d	191	};
44e4e66e	192	int error = -EINVAL;
b913100d	193
10b3dcae	194	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	195	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	196	return -ENODEV;
583c377f DB	197
583c377f DB	198	switch (state) {
8b713a88 RW	199	case PCI_D3cold:
	200	if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
	201	PM_QOS_FLAGS_ALL) {
	202	error = -EBUSY;
	203	break;
	204	}
583c377f DB	205	case PCI_D0:
	206	case PCI_D1:
	207	case PCI_D2:
	208	case PCI_D3hot:
44e4e66e	209	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	210	}
44e4e66e RW	211
44e4e66e RW	212	if (!error)
3d0882c0	213	dev_info(&dev->dev, "power state changed by ACPI to %s\n",
fc6504b3	214	acpi_power_state_string(state_conv[state]));
44e4e66e RW	215
44e4e66e RW	216	return error;
b913100d DSL	217	}
b913100d DSL	218
eb9d0fe4 RW	219	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	220	{
	221	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	222
	223	return handle ? acpi_bus_can_wakeup(handle) : false;
	224	}
	225
0baed8da RW	226	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	227	{
	228	while (bus->parent) {
dc1a94ae	229	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	230	return;
	231	bus = bus->parent;
	232	}
	233
	234	/* We have reached the root bus. */
	235	if (bus->bridge)
	236	acpi_pm_device_sleep_wake(bus->bridge, enable);
	237	}
	238
eb9d0fe4 RW	239	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	240	{
0baed8da RW	241	if (acpi_pci_can_wakeup(dev))
	242	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	243
dc1a94ae	244	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	245	return 0;
eb9d0fe4 RW	246	}
eb9d0fe4 RW	247
b67ea761 RW	248	static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
	249	{
	250	while (bus->parent) {
	251	struct pci_dev *bridge = bus->self;
	252
	253	if (bridge->pme_interrupt)
	254	return;
b24e5098	255	if (!acpi_pm_device_run_wake(&bridge->dev, enable))
b67ea761 RW	256	return;
	257	bus = bus->parent;
	258	}
	259
	260	/* We have reached the root bus. */
	261	if (bus->bridge)
b24e5098	262	acpi_pm_device_run_wake(bus->bridge, enable);
b67ea761 RW	263	}
	264
	265	static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
	266	{
448bd857 HY	267	/*
	268	* Per PCI Express Base Specification Revision 2.0 section
	269	* 5.3.3.2 Link Wakeup, platform support is needed for D3cold
	270	* waking up to power on the main link even if there is PME
	271	* support for D3cold
	272	*/
	273	if (dev->pme_interrupt && !dev->runtime_d3cold)
b67ea761 RW	274	return 0;
b67ea761 RW	275
b24e5098	276	if (!acpi_pm_device_run_wake(&dev->dev, enable))
b67ea761 RW	277	return 0;
	278
	279	acpi_pci_propagate_run_wake(dev->bus, enable);
	280	return 0;
	281	}
	282
961d9120 RW	283	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	284	.is_manageable = acpi_pci_power_manageable,
	285	.set_state = acpi_pci_set_power_state,
	286	.choose_state = acpi_pci_choose_state,
eb9d0fe4	287	.sleep_wake = acpi_pci_sleep_wake,
b67ea761	288	.run_wake = acpi_pci_run_wake,
961d9120	289	};
b913100d	290
5090d4a6 JL	291	void acpi_pci_add_bus(struct pci_bus *bus)
	292	{
	293	acpi_handle handle = NULL;
	294
	295	if (bus->bridge)
	296	handle = ACPI_HANDLE(bus->bridge);
	297	if (acpi_pci_disabled \|\| handle == NULL)
	298	return;
	299
5c0b04e3	300	acpi_pci_slot_enumerate(bus, handle);
3b63aaa7	301	acpiphp_enumerate_slots(bus, handle);
5090d4a6 JL	302	}
	303
	304	void acpi_pci_remove_bus(struct pci_bus *bus)
	305	{
	306	/*
	307	* bus->bridge->acpi_node.handle has already been reset to NULL
	308	* when acpi_pci_remove_bus() is called, so don't check ACPI handle.
	309	*/
	310	if (acpi_pci_disabled)
	311	return;
	312
3b63aaa7	313	acpiphp_remove_slots(bus);
5c0b04e3	314	acpi_pci_slot_remove(bus);
5090d4a6 JL	315	}
5090d4a6 JL	316
84df749f	317	/* ACPI bus type */
9c273b95	318	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	319	{
84df749f DSL	320	struct pci_dev * pci_dev;
439913ff	321	u64 addr;
84df749f DSL	322
	323	pci_dev = to_pci_dev(dev);
	324	/* Please ref to ACPI spec for the syntax of _ADR */
	325	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	326	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	327	if (!*handle)
	328	return -ENODEV;
	329	return 0;
	330	}
	331
38a9a67a	332	static void pci_acpi_setup(struct device *dev)
d2e5f0c1	333	{
d2e5f0c1	334	struct pci_dev *pci_dev = to_pci_dev(dev);
38a9a67a RW	335	acpi_handle handle = ACPI_HANDLE(dev);
38a9a67a RW	336	struct acpi_device *adev;
38a9a67a	337
38a9a67a	338	if (acpi_bus_get_device(handle, &adev) \|\| !adev->wakeup.flags.valid)
d2e5f0c1 RW	339	return;
	340
	341	device_set_wakeup_capable(dev, true);
	342	acpi_pci_sleep_wake(pci_dev, false);
	343
	344	pci_acpi_add_pm_notifier(adev, pci_dev);
	345	if (adev->wakeup.flags.run_wake)
	346	device_set_run_wake(dev, true);
	347	}
	348
38a9a67a	349	static void pci_acpi_cleanup(struct device *dev)
d2e5f0c1	350	{
38a9a67a RW	351	acpi_handle handle = ACPI_HANDLE(dev);
38a9a67a RW	352	struct acpi_device *adev;
d2e5f0c1	353
38a9a67a	354	if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) {
d2e5f0c1 RW	355	device_set_wakeup_capable(dev, false);
	356	device_set_run_wake(dev, false);
	357	pci_acpi_remove_pm_notifier(adev);
	358	}
	359	}
	360
53540098 RW	361	static bool pci_acpi_bus_match(struct device *dev)
	362	{
	363	return dev->bus == &pci_bus_type;
	364	}
	365
9c273b95	366	static struct acpi_bus_type acpi_pci_bus = {
53540098 RW	367	.name = "PCI",
53540098 RW	368	.match = pci_acpi_bus_match,
9c273b95	369	.find_device = acpi_pci_find_device,
38a9a67a RW	370	.setup = pci_acpi_setup,
38a9a67a RW	371	.cleanup = pci_acpi_cleanup,
84df749f DSL	372	};
84df749f DSL	373
9c273b95	374	static int __init acpi_pci_init(void)
84df749f DSL	375	{
	376	int ret;
	377
993958fe	378	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
e7d45152	379	pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
f8993aff SL	380	pci_no_msi();
f8993aff SL	381	}
5fde244d	382
993958fe	383	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
e7d45152	384	pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
5fde244d SL	385	pcie_no_aspm();
	386	}
	387
9c273b95	388	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	389	if (ret)
84df749f DSL	390	return 0;
5c0b04e3	391
961d9120	392	pci_set_platform_pm(&acpi_pci_platform_pm);
5c0b04e3	393	acpi_pci_slot_init();
3b63aaa7	394	acpiphp_init();
5c0b04e3	395
84df749f DSL	396	return 0;
84df749f DSL	397	}
9c273b95	398	arch_initcall(acpi_pci_init);