[mirror_ubuntu-zesty-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/pci_hotplug.h>
#include <linux/module.h>
#include <linux/pci-aspm.h>
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#include "pci.h"

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;
}

static acpi_status decode_type0_hpx_record(union acpi_object *record,
					   struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 6)
			return AE_ERROR;
		for (i = 2; i < 6; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t0 = &hpx->type0_data;
		hpx->t0->revision        = revision;
		hpx->t0->cache_line_size = fields[2].integer.value;
		hpx->t0->latency_timer   = fields[3].integer.value;
		hpx->t0->enable_serr     = fields[4].integer.value;
		hpx->t0->enable_perr     = fields[5].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 0 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status decode_type1_hpx_record(union acpi_object *record,
					   struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 5)
			return AE_ERROR;
		for (i = 2; i < 5; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t1 = &hpx->type1_data;
		hpx->t1->revision      = revision;
		hpx->t1->max_mem_read  = fields[2].integer.value;
		hpx->t1->avg_max_split = fields[3].integer.value;
		hpx->t1->tot_max_split = fields[4].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 1 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status decode_type2_hpx_record(union acpi_object *record,
					   struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 18)
			return AE_ERROR;
		for (i = 2; i < 18; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t2 = &hpx->type2_data;
		hpx->t2->revision      = revision;
		hpx->t2->unc_err_mask_and      = fields[2].integer.value;
		hpx->t2->unc_err_mask_or       = fields[3].integer.value;
		hpx->t2->unc_err_sever_and     = fields[4].integer.value;
		hpx->t2->unc_err_sever_or      = fields[5].integer.value;
		hpx->t2->cor_err_mask_and      = fields[6].integer.value;
		hpx->t2->cor_err_mask_or       = fields[7].integer.value;
		hpx->t2->adv_err_cap_and       = fields[8].integer.value;
		hpx->t2->adv_err_cap_or        = fields[9].integer.value;
		hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
		hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
		hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
		hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
		hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
		hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
		hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
		hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 2 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
{
	acpi_status status;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *package, *record, *fields;
	u32 type;
	int i;

	/* Clear the return buffer with zeros */
	memset(hpx, 0, sizeof(struct hotplug_params));

	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	package = (union acpi_object *)buffer.pointer;
	if (package->type != ACPI_TYPE_PACKAGE) {
		status = AE_ERROR;
		goto exit;
	}

	for (i = 0; i < package->package.count; i++) {
		record = &package->package.elements[i];
		if (record->type != ACPI_TYPE_PACKAGE) {
			status = AE_ERROR;
			goto exit;
		}

		fields = record->package.elements;
		if (fields[0].type != ACPI_TYPE_INTEGER ||
		    fields[1].type != ACPI_TYPE_INTEGER) {
			status = AE_ERROR;
			goto exit;
		}

		type = fields[0].integer.value;
		switch (type) {
		case 0:
			status = decode_type0_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 1:
			status = decode_type1_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 2:
			status = decode_type2_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		default:
			printk(KERN_ERR "%s: Type %d record not supported\n",
			       __func__, type);
			status = AE_ERROR;
			goto exit;
		}
	}
 exit:
	kfree(buffer.pointer);
	return status;
}

static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
{
	acpi_status status;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package, *fields;
	int i;

	memset(hpp, 0, sizeof(struct hotplug_params));

	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	package = (union acpi_object *) buffer.pointer;
	if (package->type != ACPI_TYPE_PACKAGE ||
	    package->package.count != 4) {
		status = AE_ERROR;
		goto exit;
	}

	fields = package->package.elements;
	for (i = 0; i < 4; i++) {
		if (fields[i].type != ACPI_TYPE_INTEGER) {
			status = AE_ERROR;
			goto exit;
		}
	}

	hpp->t0 = &hpp->type0_data;
	hpp->t0->revision        = 1;
	hpp->t0->cache_line_size = fields[0].integer.value;
	hpp->t0->latency_timer   = fields[1].integer.value;
	hpp->t0->enable_serr     = fields[2].integer.value;
	hpp->t0->enable_perr     = fields[3].integer.value;

exit:
	kfree(buffer.pointer);
	return status;
}

/* pci_get_hp_params
 *
 * @dev - the pci_dev for which we want parameters
 * @hpp - allocated by the caller
 */
int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
{
	acpi_status status;
	acpi_handle handle, phandle;
	struct pci_bus *pbus;

	handle = NULL;
	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
		handle = acpi_pci_get_bridge_handle(pbus);
		if (handle)
			break;
	}

	/*
	 * _HPP settings apply to all child buses, until another _HPP is
	 * encountered. If we don't find an _HPP for the input pci dev,
	 * look for it in the parent device scope since that would apply to
	 * this pci dev.
	 */
	while (handle) {
		status = acpi_run_hpx(handle, hpp);
		if (ACPI_SUCCESS(status))
			return 0;
		status = acpi_run_hpp(handle, hpp);
		if (ACPI_SUCCESS(status))
			return 0;
		if (acpi_is_root_bridge(handle))
			break;
		status = acpi_get_parent(handle, &phandle);
		if (ACPI_FAILURE(status))
			break;
		handle = phandle;
	}
	return -ENODEV;
}
EXPORT_SYMBOL_GPL(pci_get_hp_params);

/**
 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
 * @work: Work item to handle.
 */
static void pci_acpi_wake_bus(struct work_struct *work)
{
	struct acpi_device *adev;
	struct acpi_pci_root *root;

	adev = container_of(work, struct acpi_device, wakeup.context.work);
	root = acpi_driver_data(adev);
	pci_pme_wakeup_bus(root->bus);
}

/**
 * pci_acpi_wake_dev - PCI device wakeup notification work function.
 * @handle: ACPI handle of a device the notification is for.
 * @work: Work item to handle.
 */
static void pci_acpi_wake_dev(struct work_struct *work)
{
	struct acpi_device_wakeup_context *context;
	struct pci_dev *pci_dev;

	context = container_of(work, struct acpi_device_wakeup_context, work);
	pci_dev = to_pci_dev(context->dev);

	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 root PCI bus.
 * @dev: PCI root bridge ACPI device.
 */
acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
{
	return acpi_add_pm_notifier(dev, NULL, 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_dev->dev, pci_acpi_wake_dev);
}

/*
 * _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)
{
	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
	return adev ? acpi_device_power_manageable(adev) : false;
}

static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
	struct acpi_device *adev = ACPI_COMPANION(&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 (!adev || acpi_has_method(adev->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_device_set_power(adev, 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)
{
	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
	return adev ? acpi_device_can_wakeup(adev) : 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 struct acpi_device *acpi_pci_find_companion(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	bool check_children;
	u64 addr;

	check_children = pci_is_bridge(pci_dev);
	/* Please ref to ACPI spec for the syntax of _ADR */
	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
	return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
				      check_children);
}

static void pci_acpi_setup(struct device *dev)
{
	struct pci_dev *pci_dev = to_pci_dev(dev);
	struct acpi_device *adev = ACPI_COMPANION(dev);

	if (!adev)
		return;

	pci_acpi_add_pm_notifier(adev, pci_dev);
	if (!adev->wakeup.flags.valid)
		return;

	device_set_wakeup_capable(dev, true);
	acpi_pci_sleep_wake(pci_dev, false);
	if (adev->wakeup.flags.run_wake)
		device_set_run_wake(dev, true);
}

static void pci_acpi_cleanup(struct device *dev)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);

	if (!adev)
		return;

	pci_acpi_remove_pm_notifier(adev);
	if (adev->wakeup.flags.valid) {
		device_set_wakeup_capable(dev, false);
		device_set_run_wake(dev, false);
	}
}

static bool pci_acpi_bus_match(struct device *dev)
{
	return dev_is_pci(dev);
}

static struct acpi_bus_type acpi_pci_bus = {
	.name = "PCI",
	.match = pci_acpi_bus_match,
	.find_companion = acpi_pci_find_companion,
	.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>
9ce90ea5	13	#include <linux/pci_hotplug.h>
1da177e4	14	#include <linux/module.h>
5fde244d	15	#include <linux/pci-aspm.h>
1da177e4	16	#include <linux/pci-acpi.h>
b67ea761	17	#include <linux/pm_runtime.h>
8b713a88	18	#include <linux/pm_qos.h>
0f64474b	19	#include "pci.h"
1da177e4	20
f4b57a3b JL	21	phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
	22	{
	23	acpi_status status = AE_NOT_EXIST;
	24	unsigned long long mcfg_addr;
	25
	26	if (handle)
	27	status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
	28	NULL, &mcfg_addr);
	29	if (ACPI_FAILURE(status))
	30	return 0;
	31
	32	return (phys_addr_t)mcfg_addr;
	33	}
	34
abbfec34 BH	35	static acpi_status decode_type0_hpx_record(union acpi_object *record,
abbfec34 BH	36	struct hotplug_params *hpx)
9ce90ea5 BH	37	{
	38	int i;
	39	union acpi_object *fields = record->package.elements;
	40	u32 revision = fields[1].integer.value;
	41
	42	switch (revision) {
	43	case 1:
	44	if (record->package.count != 6)
	45	return AE_ERROR;
	46	for (i = 2; i < 6; i++)
	47	if (fields[i].type != ACPI_TYPE_INTEGER)
	48	return AE_ERROR;
	49	hpx->t0 = &hpx->type0_data;
	50	hpx->t0->revision = revision;
	51	hpx->t0->cache_line_size = fields[2].integer.value;
	52	hpx->t0->latency_timer = fields[3].integer.value;
	53	hpx->t0->enable_serr = fields[4].integer.value;
	54	hpx->t0->enable_perr = fields[5].integer.value;
	55	break;
	56	default:
	57	printk(KERN_WARNING
	58	"%s: Type 0 Revision %d record not supported\n",
	59	__func__, revision);
	60	return AE_ERROR;
	61	}
	62	return AE_OK;
	63	}
	64
abbfec34 BH	65	static acpi_status decode_type1_hpx_record(union acpi_object *record,
abbfec34 BH	66	struct hotplug_params *hpx)
9ce90ea5 BH	67	{
	68	int i;
	69	union acpi_object *fields = record->package.elements;
	70	u32 revision = fields[1].integer.value;
	71
	72	switch (revision) {
	73	case 1:
	74	if (record->package.count != 5)
	75	return AE_ERROR;
	76	for (i = 2; i < 5; i++)
	77	if (fields[i].type != ACPI_TYPE_INTEGER)
	78	return AE_ERROR;
	79	hpx->t1 = &hpx->type1_data;
	80	hpx->t1->revision = revision;
	81	hpx->t1->max_mem_read = fields[2].integer.value;
	82	hpx->t1->avg_max_split = fields[3].integer.value;
	83	hpx->t1->tot_max_split = fields[4].integer.value;
	84	break;
	85	default:
	86	printk(KERN_WARNING
	87	"%s: Type 1 Revision %d record not supported\n",
	88	__func__, revision);
	89	return AE_ERROR;
	90	}
	91	return AE_OK;
	92	}
	93
abbfec34 BH	94	static acpi_status decode_type2_hpx_record(union acpi_object *record,
abbfec34 BH	95	struct hotplug_params *hpx)
9ce90ea5 BH	96	{
	97	int i;
	98	union acpi_object *fields = record->package.elements;
	99	u32 revision = fields[1].integer.value;
	100
	101	switch (revision) {
	102	case 1:
	103	if (record->package.count != 18)
	104	return AE_ERROR;
	105	for (i = 2; i < 18; i++)
	106	if (fields[i].type != ACPI_TYPE_INTEGER)
	107	return AE_ERROR;
	108	hpx->t2 = &hpx->type2_data;
	109	hpx->t2->revision = revision;
	110	hpx->t2->unc_err_mask_and = fields[2].integer.value;
	111	hpx->t2->unc_err_mask_or = fields[3].integer.value;
	112	hpx->t2->unc_err_sever_and = fields[4].integer.value;
	113	hpx->t2->unc_err_sever_or = fields[5].integer.value;
	114	hpx->t2->cor_err_mask_and = fields[6].integer.value;
	115	hpx->t2->cor_err_mask_or = fields[7].integer.value;
	116	hpx->t2->adv_err_cap_and = fields[8].integer.value;
	117	hpx->t2->adv_err_cap_or = fields[9].integer.value;
	118	hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
	119	hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
	120	hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
	121	hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
	122	hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
	123	hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
	124	hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
	125	hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
	126	break;
	127	default:
	128	printk(KERN_WARNING
	129	"%s: Type 2 Revision %d record not supported\n",
	130	__func__, revision);
	131	return AE_ERROR;
	132	}
	133	return AE_OK;
	134	}
	135
abbfec34	136	static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
9ce90ea5 BH	137	{
	138	acpi_status status;
	139	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	140	union acpi_object package, record, *fields;
	141	u32 type;
	142	int i;
	143
	144	/* Clear the return buffer with zeros */
	145	memset(hpx, 0, sizeof(struct hotplug_params));
	146
	147	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	148	if (ACPI_FAILURE(status))
	149	return status;
	150
	151	package = (union acpi_object *)buffer.pointer;
	152	if (package->type != ACPI_TYPE_PACKAGE) {
	153	status = AE_ERROR;
	154	goto exit;
	155	}
	156
	157	for (i = 0; i < package->package.count; i++) {
	158	record = &package->package.elements[i];
	159	if (record->type != ACPI_TYPE_PACKAGE) {
	160	status = AE_ERROR;
	161	goto exit;
	162	}
	163
	164	fields = record->package.elements;
	165	if (fields[0].type != ACPI_TYPE_INTEGER \|\|
	166	fields[1].type != ACPI_TYPE_INTEGER) {
	167	status = AE_ERROR;
	168	goto exit;
	169	}
	170
	171	type = fields[0].integer.value;
	172	switch (type) {
	173	case 0:
	174	status = decode_type0_hpx_record(record, hpx);
	175	if (ACPI_FAILURE(status))
	176	goto exit;
	177	break;
	178	case 1:
	179	status = decode_type1_hpx_record(record, hpx);
	180	if (ACPI_FAILURE(status))
	181	goto exit;
	182	break;
	183	case 2:
	184	status = decode_type2_hpx_record(record, hpx);
	185	if (ACPI_FAILURE(status))
	186	goto exit;
	187	break;
	188	default:
	189	printk(KERN_ERR "%s: Type %d record not supported\n",
	190	__func__, type);
	191	status = AE_ERROR;
	192	goto exit;
	193	}
	194	}
	195	exit:
	196	kfree(buffer.pointer);
	197	return status;
	198	}
	199
abbfec34	200	static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
9ce90ea5 BH	201	{
	202	acpi_status status;
	203	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	204	union acpi_object package, fields;
	205	int i;
	206
	207	memset(hpp, 0, sizeof(struct hotplug_params));
	208
	209	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
	210	if (ACPI_FAILURE(status))
	211	return status;
	212
	213	package = (union acpi_object *) buffer.pointer;
	214	if (package->type != ACPI_TYPE_PACKAGE \|\|
	215	package->package.count != 4) {
	216	status = AE_ERROR;
	217	goto exit;
	218	}
	219
	220	fields = package->package.elements;
	221	for (i = 0; i < 4; i++) {
	222	if (fields[i].type != ACPI_TYPE_INTEGER) {
	223	status = AE_ERROR;
	224	goto exit;
	225	}
	226	}
	227
	228	hpp->t0 = &hpp->type0_data;
	229	hpp->t0->revision = 1;
	230	hpp->t0->cache_line_size = fields[0].integer.value;
	231	hpp->t0->latency_timer = fields[1].integer.value;
	232	hpp->t0->enable_serr = fields[2].integer.value;
	233	hpp->t0->enable_perr = fields[3].integer.value;
	234
	235	exit:
	236	kfree(buffer.pointer);
	237	return status;
	238	}
	239
	240	/* pci_get_hp_params
	241	*
	242	* @dev - the pci_dev for which we want parameters
	243	* @hpp - allocated by the caller
	244	*/
	245	int pci_get_hp_params(struct pci_dev dev, struct hotplug_params hpp)
	246	{
	247	acpi_status status;
	248	acpi_handle handle, phandle;
	249	struct pci_bus *pbus;
	250
	251	handle = NULL;
	252	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
	253	handle = acpi_pci_get_bridge_handle(pbus);
	254	if (handle)
	255	break;
	256	}
	257
	258	/*
	259	* _HPP settings apply to all child buses, until another _HPP is
	260	* encountered. If we don't find an _HPP for the input pci dev,
	261	* look for it in the parent device scope since that would apply to
	262	* this pci dev.
	263	*/
	264	while (handle) {
265	status = acpi_run_hpx(handle, hpp);
266	if (ACPI_SUCCESS(status))
267	return 0;
268	status = acpi_run_hpp(handle, hpp);
269	if (ACPI_SUCCESS(status))
270	return 0;
271	if (acpi_is_root_bridge(handle))
272	break;
273	status = acpi_get_parent(handle, &phandle);
274	if (ACPI_FAILURE(status))
275	break;
276	handle = phandle;
277	}
278	return -ENODEV;
279	}
280	EXPORT_SYMBOL_GPL(pci_get_hp_params);
281
5e3d2344 BH	282	/**
	283	* pci_acpi_wake_bus - Root bus wakeup notification fork function.
	284	* @work: Work item to handle.
	285	*/
	286	static void pci_acpi_wake_bus(struct work_struct *work)
	287	{
	288	struct acpi_device *adev;
	289	struct acpi_pci_root *root;
	290
	291	adev = container_of(work, struct acpi_device, wakeup.context.work);
	292	root = acpi_driver_data(adev);
	293	pci_pme_wakeup_bus(root->bus);
	294	}
	295
	296	/**
	297	* pci_acpi_wake_dev - PCI device wakeup notification work function.
	298	* @handle: ACPI handle of a device the notification is for.
	299	* @work: Work item to handle.
	300	*/
	301	static void pci_acpi_wake_dev(struct work_struct *work)
	302	{
	303	struct acpi_device_wakeup_context *context;
	304	struct pci_dev *pci_dev;
	305
	306	context = container_of(work, struct acpi_device_wakeup_context, work);
	307	pci_dev = to_pci_dev(context->dev);
	308
	309	if (pci_dev->pme_poll)
	310	pci_dev->pme_poll = false;
	311
	312	if (pci_dev->current_state == PCI_D3cold) {
	313	pci_wakeup_event(pci_dev);
	314	pm_runtime_resume(&pci_dev->dev);
	315	return;
	316	}
	317
	318	/* Clear PME Status if set. */
	319	if (pci_dev->pme_support)
	320	pci_check_pme_status(pci_dev);
	321
	322	pci_wakeup_event(pci_dev);
	323	pm_runtime_resume(&pci_dev->dev);
	324
	325	if (pci_dev->subordinate)
	326	pci_pme_wakeup_bus(pci_dev->subordinate);
	327	}
	328
	329	/**
	330	* pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
	331	* @dev: PCI root bridge ACPI device.
	332	*/
	333	acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
	334	{
	335	return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
	336	}
	337
	338	/**
	339	* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
	340	* @dev: ACPI device to add the notifier for.
	341	* @pci_dev: PCI device to check for the PME status if an event is signaled.
	342	*/
	343	acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
	344	struct pci_dev *pci_dev)
	345	{
346	return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
347	}
348
0f64474b DSL	349	/*
	350	* _SxD returns the D-state with the highest power
	351	* (lowest D-state number) supported in the S-state "x".
	352	*
	353	* If the devices does not have a _PRW
	354	* (Power Resources for Wake) supporting system wakeup from "x"
	355	* then the OS is free to choose a lower power (higher number
	356	* D-state) than the return value from _SxD.
	357	*
	358	* But if _PRW is enabled at S-state "x", the OS
	359	* must not choose a power lower than _SxD --
	360	* unless the device has an _SxW method specifying
	361	* the lowest power (highest D-state number) the device
	362	* may enter while still able to wake the system.
	363	*
	364	* ie. depending on global OS policy:
	365	*
	366	* if (_PRW at S-state x)
	367	* choose from highest power _SxD to lowest power _SxW
	368	* else // no _PRW at S-state x
f7625980	369	* choose highest power _SxD or any lower power
0f64474b DSL	370	*/
0f64474b DSL	371
8d2bdf49	372	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	373	{
448bd857	374	int acpi_state, d_max;
0f64474b	375
448bd857 HY	376	if (pdev->no_d3cold)
	377	d_max = ACPI_STATE_D3_HOT;
	378	else
	379	d_max = ACPI_STATE_D3_COLD;
	380	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
ab826ca4 SL	381	if (acpi_state < 0)
	382	return PCI_POWER_ERROR;
	383
	384	switch (acpi_state) {
	385	case ACPI_STATE_D0:
	386	return PCI_D0;
	387	case ACPI_STATE_D1:
	388	return PCI_D1;
	389	case ACPI_STATE_D2:
	390	return PCI_D2;
1cc0c998	391	case ACPI_STATE_D3_HOT:
ab826ca4	392	return PCI_D3hot;
28c2103d LM	393	case ACPI_STATE_D3_COLD:
28c2103d LM	394	return PCI_D3cold;
ab826ca4 SL	395	}
ab826ca4 SL	396	return PCI_POWER_ERROR;
0f64474b	397	}
961d9120 RW	398
	399	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	400	{
85dbb3d0 RW	401	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
85dbb3d0 RW	402	return adev ? acpi_device_power_manageable(adev) : false;
961d9120	403	}
0f64474b	404
b913100d DSL	405	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
b913100d DSL	406	{
85dbb3d0	407	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
583c377f DB	408	static const u8 state_conv[] = {
	409	[PCI_D0] = ACPI_STATE_D0,
	410	[PCI_D1] = ACPI_STATE_D1,
	411	[PCI_D2] = ACPI_STATE_D2,
fc6504b3 RW	412	[PCI_D3hot] = ACPI_STATE_D3_COLD,
fc6504b3 RW	413	[PCI_D3cold] = ACPI_STATE_D3_COLD,
b913100d	414	};
44e4e66e	415	int error = -EINVAL;
b913100d	416
10b3dcae	417	/* If the ACPI device has _EJ0, ignore the device */
85dbb3d0	418	if (!adev \|\| acpi_has_method(adev->handle, "_EJ0"))
44e4e66e	419	return -ENODEV;
583c377f DB	420
583c377f DB	421	switch (state) {
8b713a88 RW	422	case PCI_D3cold:
	423	if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
	424	PM_QOS_FLAGS_ALL) {
	425	error = -EBUSY;
	426	break;
	427	}
583c377f DB	428	case PCI_D0:
	429	case PCI_D1:
	430	case PCI_D2:
	431	case PCI_D3hot:
85dbb3d0	432	error = acpi_device_set_power(adev, state_conv[state]);
583c377f	433	}
44e4e66e RW	434
44e4e66e RW	435	if (!error)
d010e576	436	dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
fc6504b3	437	acpi_power_state_string(state_conv[state]));
44e4e66e RW	438
44e4e66e RW	439	return error;
b913100d DSL	440	}
b913100d DSL	441
eb9d0fe4 RW	442	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
eb9d0fe4 RW	443	{
85dbb3d0 RW	444	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
85dbb3d0 RW	445	return adev ? acpi_device_can_wakeup(adev) : false;
eb9d0fe4 RW	446	}
eb9d0fe4 RW	447
0baed8da RW	448	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	449	{
	450	while (bus->parent) {
dc1a94ae	451	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	452	return;
	453	bus = bus->parent;
	454	}
	455
	456	/* We have reached the root bus. */
	457	if (bus->bridge)
	458	acpi_pm_device_sleep_wake(bus->bridge, enable);
	459	}
	460
eb9d0fe4 RW	461	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	462	{
0baed8da RW	463	if (acpi_pci_can_wakeup(dev))
	464	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	465
dc1a94ae	466	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	467	return 0;
eb9d0fe4 RW	468	}
eb9d0fe4 RW	469
b67ea761 RW	470	static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
	471	{
	472	while (bus->parent) {
	473	struct pci_dev *bridge = bus->self;
	474
	475	if (bridge->pme_interrupt)
	476	return;
b24e5098	477	if (!acpi_pm_device_run_wake(&bridge->dev, enable))
b67ea761 RW	478	return;
	479	bus = bus->parent;
	480	}
	481
	482	/* We have reached the root bus. */
	483	if (bus->bridge)
b24e5098	484	acpi_pm_device_run_wake(bus->bridge, enable);
b67ea761 RW	485	}
	486
	487	static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
	488	{
448bd857 HY	489	/*
	490	* Per PCI Express Base Specification Revision 2.0 section
	491	* 5.3.3.2 Link Wakeup, platform support is needed for D3cold
	492	* waking up to power on the main link even if there is PME
	493	* support for D3cold
	494	*/
	495	if (dev->pme_interrupt && !dev->runtime_d3cold)
b67ea761 RW	496	return 0;
b67ea761 RW	497
b24e5098	498	if (!acpi_pm_device_run_wake(&dev->dev, enable))
b67ea761 RW	499	return 0;
	500
	501	acpi_pci_propagate_run_wake(dev->bus, enable);
	502	return 0;
	503	}
	504
961d9120 RW	505	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	506	.is_manageable = acpi_pci_power_manageable,
	507	.set_state = acpi_pci_set_power_state,
	508	.choose_state = acpi_pci_choose_state,
eb9d0fe4	509	.sleep_wake = acpi_pci_sleep_wake,
b67ea761	510	.run_wake = acpi_pci_run_wake,
961d9120	511	};
b913100d	512
5090d4a6 JL	513	void acpi_pci_add_bus(struct pci_bus *bus)
5090d4a6 JL	514	{
be1c9de9	515	if (acpi_pci_disabled \|\| !bus->bridge)
5090d4a6 JL	516	return;
5090d4a6 JL	517
be1c9de9 RW	518	acpi_pci_slot_enumerate(bus);
be1c9de9 RW	519	acpiphp_enumerate_slots(bus);
5090d4a6 JL	520	}
	521
	522	void acpi_pci_remove_bus(struct pci_bus *bus)
	523	{
be1c9de9	524	if (acpi_pci_disabled \|\| !bus->bridge)
5090d4a6 JL	525	return;
5090d4a6 JL	526
3b63aaa7	527	acpiphp_remove_slots(bus);
5c0b04e3	528	acpi_pci_slot_remove(bus);
5090d4a6 JL	529	}
5090d4a6 JL	530
84df749f	531	/* ACPI bus type */
e3f02c52	532	static struct acpi_device acpi_pci_find_companion(struct device dev)
84df749f	533	{
60f75b8e	534	struct pci_dev *pci_dev = to_pci_dev(dev);
5ce79d20	535	bool check_children;
60f75b8e	536	u64 addr;
84df749f	537
6788a51f	538	check_children = pci_is_bridge(pci_dev);
84df749f DSL	539	/* Please ref to ACPI spec for the syntax of _ADR */
84df749f DSL	540	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
e3f02c52	541	return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
5ce79d20	542	check_children);
84df749f DSL	543	}
84df749f DSL	544
38a9a67a	545	static void pci_acpi_setup(struct device *dev)
d2e5f0c1	546	{
d2e5f0c1	547	struct pci_dev *pci_dev = to_pci_dev(dev);
f084280c	548	struct acpi_device *adev = ACPI_COMPANION(dev);
38a9a67a	549
f084280c RW	550	if (!adev)
	551	return;
	552
	553	pci_acpi_add_pm_notifier(adev, pci_dev);
	554	if (!adev->wakeup.flags.valid)
d2e5f0c1 RW	555	return;
	556
	557	device_set_wakeup_capable(dev, true);
	558	acpi_pci_sleep_wake(pci_dev, false);
d2e5f0c1 RW	559	if (adev->wakeup.flags.run_wake)
	560	device_set_run_wake(dev, true);
	561	}
	562
38a9a67a	563	static void pci_acpi_cleanup(struct device *dev)
d2e5f0c1	564	{
f084280c RW	565	struct acpi_device *adev = ACPI_COMPANION(dev);
	566
	567	if (!adev)
	568	return;
d2e5f0c1	569
f084280c RW	570	pci_acpi_remove_pm_notifier(adev);
f084280c RW	571	if (adev->wakeup.flags.valid) {
d2e5f0c1 RW	572	device_set_wakeup_capable(dev, false);
d2e5f0c1 RW	573	device_set_run_wake(dev, false);
d2e5f0c1 RW	574	}
	575	}
	576
53540098 RW	577	static bool pci_acpi_bus_match(struct device *dev)
53540098 RW	578	{
40c368c1	579	return dev_is_pci(dev);
53540098 RW	580	}
53540098 RW	581
9c273b95	582	static struct acpi_bus_type acpi_pci_bus = {
53540098 RW	583	.name = "PCI",
53540098 RW	584	.match = pci_acpi_bus_match,
e3f02c52	585	.find_companion = acpi_pci_find_companion,
38a9a67a RW	586	.setup = pci_acpi_setup,
38a9a67a RW	587	.cleanup = pci_acpi_cleanup,
84df749f DSL	588	};
84df749f DSL	589
9c273b95	590	static int __init acpi_pci_init(void)
84df749f DSL	591	{
	592	int ret;
	593
993958fe	594	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
e7d45152	595	pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
f8993aff SL	596	pci_no_msi();
f8993aff SL	597	}
5fde244d	598
993958fe	599	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
e7d45152	600	pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
5fde244d SL	601	pcie_no_aspm();
	602	}
	603
9c273b95	604	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	605	if (ret)
84df749f DSL	606	return 0;
5c0b04e3	607
961d9120	608	pci_set_platform_pm(&acpi_pci_platform_pm);
5c0b04e3	609	acpi_pci_slot_init();
3b63aaa7	610	acpiphp_init();
5c0b04e3	611
84df749f DSL	612	return 0;
84df749f DSL	613	}
9c273b95	614	arch_initcall(acpi_pci_init);