xref: /linux/include/linux/pci.h (revision 889600e21e3be388a6817c2a0dac0411df860751)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *	pci.h
 *
 *	PCI defines and function prototypes
 *	Copyright 1994, Drew Eckhardt
 *	Copyright 1997--1999 Martin Mares <mj@ucw.cz>
 *
 *	PCI Express ASPM defines and function prototypes
 *	Copyright (c) 2007 Intel Corp.
 *		Zhang Yanmin (yanmin.zhang@intel.com)
 *		Shaohua Li (shaohua.li@intel.com)
 *
 *	For more information, please consult the following manuals (look at
 *	http://www.pcisig.com/ for how to get them):
 *
 *	PCI BIOS Specification
 *	PCI Local Bus Specification
 *	PCI to PCI Bridge Specification
 *	PCI Express Specification
 *	PCI System Design Guide
 */
#ifndef LINUX_PCI_H
#define LINUX_PCI_H

#include <linux/args.h>
#include <linux/device-id/pci.h>

#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/kobject.h>
#include <linux/atomic.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/resource_ext.h>
#include <linux/msi_api.h>
#include <uapi/linux/pci.h>

#include <linux/pci_ids.h>

#define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY  | \
			       PCI_STATUS_SIG_SYSTEM_ERROR | \
			       PCI_STATUS_REC_MASTER_ABORT | \
			       PCI_STATUS_REC_TARGET_ABORT | \
			       PCI_STATUS_SIG_TARGET_ABORT | \
			       PCI_STATUS_PARITY)

/* Number of reset methods used in pci_reset_fn_methods array in pci.c */
#define PCI_NUM_RESET_METHODS 8

#define PCI_RESET_PROBE		true
#define PCI_RESET_DO_RESET	false

/*
 * The PCI interface treats multi-function devices as independent
 * devices.  The slot/function address of each device is encoded
 * in a single byte as follows:
 *
 *	7:3 = slot
 *	2:0 = function
 *
 * PCI_DEVFN(), PCI_SLOT(), and PCI_FUNC() are defined in uapi/linux/pci.h.
 * In the interest of not exposing interfaces to user-space unnecessarily,
 * the following kernel-only defines are being added here.
 */
#define PCI_DEVID(bus, devfn)	((((u16)(bus)) << 8) | (devfn))
/* return bus from PCI devid = ((u16)bus_number) << 8) | devfn */
#define PCI_BUS_NUM(x) (((x) >> 8) & 0xff)

/*
 * PCI_SLOT_ALL_DEVICES indicates a slot that covers all devices on the bus.
 * Used for PCIe hotplug where the physical slot is the entire secondary bus,
 * and, if ARI Forwarding is enabled, functions may appear to be on multiple
 * devices.
 */
#define PCI_SLOT_ALL_DEVICES	0xfeff

/* Used to identify a slot as a placeholder */
#define PCI_SLOT_PLACEHOLDER	0xffff

/* pci_slot represents a physical slot */
struct pci_slot {
	struct pci_bus		*bus;		/* Bus this slot is on */
	struct list_head	list;		/* Node in list of slots */
	struct hotplug_slot	*hotplug;	/* Hotplug info (move here) */
	u16			number;		/* Device nr, or PCI_SLOT_ALL_DEVICES */
	unsigned int		per_func_slot:1; /* Allow per function slot */
	struct kobject		kobj;
};

static inline const char *pci_slot_name(const struct pci_slot *slot)
{
	return kobject_name(&slot->kobj);
}

/* File state for mmap()s on /proc/bus/pci/X/Y */
enum pci_mmap_state {
	pci_mmap_io,
	pci_mmap_mem
};

/* For PCI devices, the region numbers are assigned this way: */
enum {
	/* #0-5: standard PCI resources */
	PCI_STD_RESOURCES,
	PCI_STD_RESOURCE_END = PCI_STD_RESOURCES + PCI_STD_NUM_BARS - 1,

	/* #6: expansion ROM resource */
	PCI_ROM_RESOURCE,

	/* Device-specific resources */
#ifdef CONFIG_PCI_IOV
	PCI_IOV_RESOURCES,
	PCI_IOV_RESOURCE_END = PCI_IOV_RESOURCES + PCI_SRIOV_NUM_BARS - 1,
#endif

/* PCI-to-PCI (P2P) bridge windows */
#define PCI_BRIDGE_IO_WINDOW		(PCI_BRIDGE_RESOURCES + 0)
#define PCI_BRIDGE_MEM_WINDOW		(PCI_BRIDGE_RESOURCES + 1)
#define PCI_BRIDGE_PREF_MEM_WINDOW	(PCI_BRIDGE_RESOURCES + 2)

/* CardBus bridge windows */
#define PCI_CB_BRIDGE_IO_0_WINDOW	(PCI_BRIDGE_RESOURCES + 0)
#define PCI_CB_BRIDGE_IO_1_WINDOW	(PCI_BRIDGE_RESOURCES + 1)
#define PCI_CB_BRIDGE_MEM_0_WINDOW	(PCI_BRIDGE_RESOURCES + 2)
#define PCI_CB_BRIDGE_MEM_1_WINDOW	(PCI_BRIDGE_RESOURCES + 3)

/* Total number of bridge resources for P2P and CardBus */
#define PCI_P2P_BRIDGE_RESOURCE_NUM	3
#define PCI_BRIDGE_RESOURCE_NUM		4

	/* Resources assigned to buses behind the bridge */
	PCI_BRIDGE_RESOURCES,
	PCI_BRIDGE_RESOURCE_END = PCI_BRIDGE_RESOURCES +
				  PCI_BRIDGE_RESOURCE_NUM - 1,

	/* Total resources associated with a PCI device */
	PCI_NUM_RESOURCES,

	/* Preserve this for compatibility */
	DEVICE_COUNT_RESOURCE = PCI_NUM_RESOURCES,
};

/**
 * enum pci_interrupt_pin - PCI INTx interrupt values
 * @PCI_INTERRUPT_UNKNOWN: Unknown or unassigned interrupt
 * @PCI_INTERRUPT_INTA: PCI INTA pin
 * @PCI_INTERRUPT_INTB: PCI INTB pin
 * @PCI_INTERRUPT_INTC: PCI INTC pin
 * @PCI_INTERRUPT_INTD: PCI INTD pin
 *
 * Corresponds to values for legacy PCI INTx interrupts, as can be found in the
 * PCI_INTERRUPT_PIN register.
 */
enum pci_interrupt_pin {
	PCI_INTERRUPT_UNKNOWN,
	PCI_INTERRUPT_INTA,
	PCI_INTERRUPT_INTB,
	PCI_INTERRUPT_INTC,
	PCI_INTERRUPT_INTD,
};

/* The number of legacy PCI INTx interrupts */
#define PCI_NUM_INTX	4

/*
 * Reading from a device that doesn't respond typically returns ~0.  A
 * successful read from a device may also return ~0, so you need additional
 * information to reliably identify errors.
 */
#define PCI_ERROR_RESPONSE		(~0ULL)
#define PCI_SET_ERROR_RESPONSE(val)	(*(val) = ((typeof(*(val))) PCI_ERROR_RESPONSE))
#define PCI_POSSIBLE_ERROR(val)		((val) == ((typeof(val)) PCI_ERROR_RESPONSE))

/*
 * pci_power_t values must match the bits in the Capabilities PME_Support
 * and Control/Status PowerState fields in the Power Management capability.
 */
typedef int __bitwise pci_power_t;

#define PCI_D0		((pci_power_t __force) 0)
#define PCI_D1		((pci_power_t __force) 1)
#define PCI_D2		((pci_power_t __force) 2)
#define PCI_D3hot	((pci_power_t __force) 3)
#define PCI_D3cold	((pci_power_t __force) 4)
#define PCI_UNKNOWN	((pci_power_t __force) 5)
#define PCI_POWER_ERROR	((pci_power_t __force) -1)

/* Remember to update this when the list above changes! */
extern const char *pci_power_names[];

static inline const char *pci_power_name(pci_power_t state)
{
	return pci_power_names[1 + (__force int) state];
}

/**
 * typedef pci_channel_state_t
 *
 * The pci_channel state describes connectivity between the CPU and
 * the PCI device.  If some PCI bus between here and the PCI device
 * has crashed or locked up, this info is reflected here.
 */
typedef unsigned int __bitwise pci_channel_state_t;

enum {
	/* I/O channel is in normal state */
	pci_channel_io_normal = (__force pci_channel_state_t) 1,

	/* I/O to channel is blocked */
	pci_channel_io_frozen = (__force pci_channel_state_t) 2,

	/* PCI card is dead */
	pci_channel_io_perm_failure = (__force pci_channel_state_t) 3,
};

typedef unsigned int __bitwise pcie_reset_state_t;

enum pcie_reset_state {
	/* Reset is NOT asserted (Use to deassert reset) */
	pcie_deassert_reset = (__force pcie_reset_state_t) 1,

	/* Use #PERST to reset PCIe device */
	pcie_warm_reset = (__force pcie_reset_state_t) 2,

	/* Use PCIe Hot Reset to reset device */
	pcie_hot_reset = (__force pcie_reset_state_t) 3
};

typedef unsigned short __bitwise pci_dev_flags_t;
enum pci_dev_flags {
	/* INTX_DISABLE in PCI_COMMAND register disables MSI too */
	PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) (1 << 0),
	/* Device configuration is irrevocably lost if disabled into D3 */
	PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) (1 << 1),
	/* Provide indication device is assigned by a Virtual Machine Manager */
	PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) (1 << 2),
	/* Flag for quirk use to store if quirk-specific ACS is enabled */
	PCI_DEV_FLAGS_ACS_ENABLED_QUIRK = (__force pci_dev_flags_t) (1 << 3),
	/* Use a PCIe-to-PCI bridge alias even if !pci_is_pcie */
	PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS = (__force pci_dev_flags_t) (1 << 5),
	/* Do not use bus resets for device */
	PCI_DEV_FLAGS_NO_BUS_RESET = (__force pci_dev_flags_t) (1 << 6),
	/* Do not use PM reset even if device advertises NoSoftRst- */
	PCI_DEV_FLAGS_NO_PM_RESET = (__force pci_dev_flags_t) (1 << 7),
	/* Get VPD from function 0 VPD */
	PCI_DEV_FLAGS_VPD_REF_F0 = (__force pci_dev_flags_t) (1 << 8),
	/* A non-root bridge where translation occurs, stop alias search here */
	PCI_DEV_FLAGS_BRIDGE_XLATE_ROOT = (__force pci_dev_flags_t) (1 << 9),
	/* Do not use FLR even if device advertises PCI_AF_CAP */
	PCI_DEV_FLAGS_NO_FLR_RESET = (__force pci_dev_flags_t) (1 << 10),
	/* Don't use Relaxed Ordering for TLPs directed at this device */
	PCI_DEV_FLAGS_NO_RELAXED_ORDERING = (__force pci_dev_flags_t) (1 << 11),
	/* Device does honor MSI masking despite saying otherwise */
	PCI_DEV_FLAGS_HAS_MSI_MASKING = (__force pci_dev_flags_t) (1 << 12),
	/* Device requires write to PCI_MSIX_ENTRY_DATA before any MSIX reads */
	PCI_DEV_FLAGS_MSIX_TOUCH_ENTRY_DATA_FIRST = (__force pci_dev_flags_t) (1 << 13),
	/*
	 * PCIe to PCI bridge does not create RID aliases because the bridge is
	 * integrated with the downstream devices and doesn't use real PCI.
	 */
	PCI_DEV_FLAGS_PCI_BRIDGE_NO_ALIAS = (__force pci_dev_flags_t) (1 << 14),
};

enum pci_irq_reroute_variant {
	INTEL_IRQ_REROUTE_VARIANT = 1,
	MAX_IRQ_REROUTE_VARIANTS = 3
};

typedef unsigned short __bitwise pci_bus_flags_t;
enum pci_bus_flags {
	PCI_BUS_FLAGS_NO_MSI	= (__force pci_bus_flags_t) 1,
	PCI_BUS_FLAGS_NO_MMRBC	= (__force pci_bus_flags_t) 2,
	PCI_BUS_FLAGS_NO_AERSID	= (__force pci_bus_flags_t) 4,
	PCI_BUS_FLAGS_NO_EXTCFG	= (__force pci_bus_flags_t) 8,
};

/* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
enum pcie_link_width {
	PCIE_LNK_WIDTH_RESRV	= 0x00,
	PCIE_LNK_X1		= 0x01,
	PCIE_LNK_X2		= 0x02,
	PCIE_LNK_X4		= 0x04,
	PCIE_LNK_X8		= 0x08,
	PCIE_LNK_X12		= 0x0c,
	PCIE_LNK_X16		= 0x10,
	PCIE_LNK_X32		= 0x20,
	PCIE_LNK_WIDTH_UNKNOWN	= 0xff,
};

/* See matching string table in pci_speed_string() */
enum pci_bus_speed {
	PCI_SPEED_33MHz			= 0x00,
	PCI_SPEED_66MHz			= 0x01,
	PCI_SPEED_66MHz_PCIX		= 0x02,
	PCI_SPEED_100MHz_PCIX		= 0x03,
	PCI_SPEED_133MHz_PCIX		= 0x04,
	PCI_SPEED_66MHz_PCIX_ECC	= 0x05,
	PCI_SPEED_100MHz_PCIX_ECC	= 0x06,
	PCI_SPEED_133MHz_PCIX_ECC	= 0x07,
	PCI_SPEED_66MHz_PCIX_266	= 0x09,
	PCI_SPEED_100MHz_PCIX_266	= 0x0a,
	PCI_SPEED_133MHz_PCIX_266	= 0x0b,
	AGP_UNKNOWN			= 0x0c,
	AGP_1X				= 0x0d,
	AGP_2X				= 0x0e,
	AGP_4X				= 0x0f,
	AGP_8X				= 0x10,
	PCI_SPEED_66MHz_PCIX_533	= 0x11,
	PCI_SPEED_100MHz_PCIX_533	= 0x12,
	PCI_SPEED_133MHz_PCIX_533	= 0x13,
	PCIE_SPEED_2_5GT		= 0x14,
	PCIE_SPEED_5_0GT		= 0x15,
	PCIE_SPEED_8_0GT		= 0x16,
	PCIE_SPEED_16_0GT		= 0x17,
	PCIE_SPEED_32_0GT		= 0x18,
	PCIE_SPEED_64_0GT		= 0x19,
	PCI_SPEED_UNKNOWN		= 0xff,
};

enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev);
enum pcie_link_width pcie_get_width_cap(struct pci_dev *dev);

struct pci_vpd {
	struct mutex	lock;
	unsigned int	len;
	u8		cap;
};

struct irq_affinity;
struct pcie_bwctrl_data;
struct pcie_link_state;
struct pci_sriov;
struct pci_p2pdma;
struct rcec_ea;

/* struct pci_dev - describes a PCI device
 *
 * @supported_speeds:	PCIe Supported Link Speeds Vector (+ reserved 0 at
 *			LSB). 0 when the supported speeds cannot be
 *			determined (e.g., for Root Complex Integrated
 *			Endpoints without the relevant Capability
 *			Registers).
 * @is_hotplug_bridge:	Hotplug bridge of any kind (e.g. PCIe Hot-Plug Capable,
 *			Conventional PCI Hot-Plug, ACPI slot).
 *			Such bridges are allocated additional MMIO and bus
 *			number resources to allow for hierarchy expansion.
 * @is_pciehp:		PCIe Hot-Plug Capable bridge.
 */
struct pci_dev {
	struct list_head bus_list;	/* Node in per-bus list */
	struct pci_bus	*bus;		/* Bus this device is on */
	struct pci_bus	*subordinate;	/* Bus this device bridges to */

	void		*sysdata;	/* Hook for sys-specific extension */
	struct proc_dir_entry *procent;	/* Device entry in /proc/bus/pci */
	struct pci_slot	*slot;		/* Physical slot this device is in */

	unsigned int	devfn;		/* Encoded device & function index */
	unsigned short	vendor;
	unsigned short	device;
	unsigned short	subsystem_vendor;
	unsigned short	subsystem_device;
	unsigned int	class;		/* 3 bytes: (base,sub,prog-if) */
	u8		revision;	/* PCI revision, low byte of class word */
	u8		hdr_type;	/* PCI header type (`multi' flag masked out) */
#ifdef CONFIG_PCIEAER
	u16		aer_cap;	/* AER capability offset */
	struct aer_info	*aer_info;	/* AER info for this device */
#endif
#ifdef CONFIG_PCIEPORTBUS
	struct rcec_ea	*rcec_ea;	/* RCEC cached endpoint association */
	struct pci_dev  *rcec;          /* Associated RCEC device */
#endif
	u32		devcap;		/* PCIe Device Capabilities */
	u16		rebar_cap;	/* Resizable BAR capability offset */
	u8		pcie_cap;	/* PCIe capability offset */
	u8		msi_cap;	/* MSI capability offset */
	u8		msix_cap;	/* MSI-X capability offset */
	u8		pcie_mpss:3;	/* PCIe Max Payload Size Supported */
	u8		rom_base_reg;	/* Config register controlling ROM */
	u8		pin;		/* Interrupt pin this device uses */
	u16		pcie_flags_reg;	/* Cached PCIe Capabilities Register */
	unsigned long	*dma_alias_mask;/* Mask of enabled devfn aliases */

	struct pci_driver *driver;	/* Driver bound to this device */
	u64		dma_mask;	/* Mask of the bits of bus address this
					   device implements.  Normally this is
					   0xffffffff.  You only need to change
					   this if your device has broken DMA
					   or supports 64-bit transfers.  */
	u64		msi_addr_mask;	/* Mask of the bits of bus address for
					   MSI that this device implements.
					   Normally set based on device
					   capabilities. You only need to
					   change this if your device claims
					   to support 64-bit MSI but implements
					   fewer than 64 address bits. */

	struct device_dma_parameters dma_parms;

	pci_power_t	current_state;	/* Current operating state. In ACPI,
					   this is D0-D3, D0 being fully
					   functional, and D3 being off. */
	u8		pm_cap;		/* PM capability offset */
	unsigned int	pme_support:5;	/* Bitmask of states from which PME#
					   can be generated */
	unsigned int	pme_poll:1;	/* Poll device's PME status bit */
	unsigned int	pinned:1;	/* Whether this dev is pinned */
	unsigned int	config_rrs_sv:1; /* Config RRS software visibility */
	unsigned int	imm_ready:1;	/* Supports Immediate Readiness */
	unsigned int	d1_support:1;	/* Low power state D1 is supported */
	unsigned int	d2_support:1;	/* Low power state D2 is supported */
	unsigned int	no_d1d2:1;	/* D1 and D2 are forbidden */
	unsigned int	no_d3cold:1;	/* D3cold is forbidden */
	unsigned int	bridge_d3:1;	/* Allow D3 for bridge */
	unsigned int	d3cold_allowed:1;	/* D3cold is allowed by user */
	unsigned int	mmio_always_on:1;	/* Disallow turning off io/mem
						   decoding during BAR sizing */
	unsigned int	wakeup_prepared:1;
	unsigned int	skip_bus_pm:1;	/* Internal: Skip bus-level PM */
	unsigned int	ignore_hotplug:1;	/* Ignore hotplug events */
	unsigned int	hotplug_user_indicators:1; /* SlotCtl indicators
						      controlled exclusively by
						      user sysfs */
	unsigned int	clear_retrain_link:1;	/* Need to clear Retrain Link
						   bit manually */
	unsigned int	no_bw_notif:1;	/* BW notifications may cause issues */
	unsigned int	d3hot_delay;	/* D3hot->D0 transition time in ms */
	unsigned int	d3cold_delay;	/* D3cold->D0 transition time in ms */

	u16		l1ss;		/* L1SS Capability pointer */
#ifdef CONFIG_PCIEASPM
	struct pcie_link_state	*link_state;	/* ASPM link state */
	unsigned int	aspm_l0s_support:1;	/* ASPM L0s support */
	unsigned int	aspm_l1_support:1;	/* ASPM L1 support */
	unsigned int	ltr_path:1;	/* Latency Tolerance Reporting
					   supported from root to here */
#endif
	unsigned int	pasid_no_tlp:1;		/* PASID works without TLP Prefix */
	unsigned int	eetlp_prefix_max:3;	/* Max # of End-End TLP Prefixes, 0=not supported */

	pci_channel_state_t error_state;	/* Current connectivity state */
	struct device	dev;			/* Generic device interface */

	int		cfg_size;		/* Size of config space */

	/*
	 * Instead of touching interrupt line and base address registers
	 * directly, use the values stored here. They might be different!
	 */
	unsigned int	irq;
	struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
	struct resource driver_exclusive_resource;	 /* driver exclusive resource ranges */

	unsigned int	transparent:1;		/* Subtractive decode bridge */
	unsigned int	io_window:1;		/* Bridge has I/O window */
	unsigned int	pref_window:1;		/* Bridge has pref mem window */
	unsigned int	pref_64_window:1;	/* Pref mem window is 64-bit */
	unsigned int	multifunction:1;	/* Multi-function device */

	unsigned int	is_busmaster:1;		/* Is busmaster */
	unsigned int	no_msi:1;		/* May not use MSI */
	unsigned int	block_cfg_access:1;	/* Config space access blocked */
	unsigned int	broken_parity_status:1;	/* Generates false positive parity */
	unsigned int	irq_reroute_variant:2;	/* Needs IRQ rerouting variant */
	unsigned int	msi_enabled:1;
	unsigned int	msix_enabled:1;
	unsigned int	ari_enabled:1;		/* ARI forwarding */
	unsigned int	ats_enabled:1;		/* Address Translation Svc */
	unsigned int	pasid_enabled:1;	/* Process Address Space ID */
	unsigned int	pri_enabled:1;		/* Page Request Interface */
	unsigned int	tph_enabled:1;		/* TLP Processing Hints */
	unsigned int	fm_enabled:1;		/* Flit Mode (segment captured) */
	unsigned int	is_managed:1;		/* Managed via devres */
	unsigned int	is_msi_managed:1;	/* MSI release via devres installed */
	unsigned int	needs_freset:1;		/* Requires fundamental reset */
	unsigned int	state_saved:1;
	unsigned int	is_physfn:1;
	unsigned int	is_virtfn:1;
	unsigned int	is_hotplug_bridge:1;
	unsigned int	is_pciehp:1;
	unsigned int	shpc_managed:1;		/* SHPC owned by shpchp */
	unsigned int	is_thunderbolt:1;	/* Thunderbolt controller */
	unsigned int	is_cxl:1;               /* Compute Express Link (CXL) */
	/*
	 * Devices marked being untrusted are the ones that can potentially
	 * execute DMA attacks and similar. They are typically connected
	 * through external ports such as Thunderbolt but not limited to
	 * that. When an IOMMU is enabled they should be getting full
	 * mappings to make sure they cannot access arbitrary memory.
	 */
	unsigned int	untrusted:1;
	/*
	 * Info from the platform, e.g., ACPI or device tree, may mark a
	 * device as "external-facing".  An external-facing device is
	 * itself internal but devices downstream from it are external.
	 */
	unsigned int	external_facing:1;
	unsigned int	broken_intx_masking:1;	/* INTx masking can't be used */
	unsigned int	io_window_1k:1;		/* Intel bridge 1K I/O windows */
	unsigned int	irq_managed:1;
	unsigned int	non_compliant_bars:1;	/* Broken BARs; ignore them */
	unsigned int	is_probed:1;		/* Device probing in progress */
	unsigned int	link_active_reporting:1;/* Device capable of reporting link active */
	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
	unsigned int	no_command_memory:1;	/* No PCI_COMMAND_MEMORY */
	unsigned int	rom_bar_overlap:1;	/* ROM BAR disable broken */
	unsigned int	rom_attr_enabled:1;	/* Display of ROM attribute enabled? */
	unsigned int	non_mappable_bars:1;	/* BARs can't be mapped by CPU or peers */
	pci_dev_flags_t dev_flags;
	atomic_t	enable_cnt;	/* pci_enable_device has been called */

	spinlock_t	pcie_cap_lock;		/* Protects RMW ops in capability accessors */
	u32		saved_config_space[16]; /* Config space saved at suspend time */
	struct hlist_head saved_cap_space;

#ifdef CONFIG_HOTPLUG_PCI_PCIE
	unsigned int	broken_cmd_compl:1;	/* No compl for some cmds */
#endif
#ifdef CONFIG_PCIE_PTM
	u16		ptm_cap;		/* PTM Capability */
	unsigned int	ptm_root:1;
	unsigned int	ptm_responder:1;
	unsigned int	ptm_requester:1;
	atomic_t	ptm_enable_cnt;
	u8		ptm_granularity;
#endif
#ifdef CONFIG_PCI_MSI
	void __iomem	*msix_base;
	raw_spinlock_t	msi_lock;
#endif
	struct pci_vpd	vpd;
#ifdef CONFIG_PCIE_DPC
	u16		dpc_cap;
	unsigned int	dpc_rp_extensions:1;
	u8		dpc_rp_log_size;
#endif
	struct pcie_bwctrl_data		*link_bwctrl;
#ifdef CONFIG_PCI_ATS
	union {
		struct pci_sriov	*sriov;		/* PF: SR-IOV info */
		struct pci_dev		*physfn;	/* VF: related PF */
	};
	u16		ats_cap;	/* ATS Capability offset */
	u8		ats_stu;	/* ATS Smallest Translation Unit */
#endif
#ifdef CONFIG_PCI_PRI
	u16		pri_cap;	/* PRI Capability offset */
	u32		pri_reqs_alloc; /* Number of PRI requests allocated */
	unsigned int	pasid_required:1; /* PRG Response PASID Required */
#endif
#ifdef CONFIG_PCI_PASID
	u16		pasid_cap;	/* PASID Capability offset */
	u16		pasid_features;
#endif
#ifdef CONFIG_PCI_P2PDMA
	struct pci_p2pdma __rcu *p2pdma;
#endif
#ifdef CONFIG_PCI_DOE
	struct xarray	doe_mbs;	/* Data Object Exchange mailboxes */
#endif
#ifdef CONFIG_PCI_NPEM
	struct npem	*npem;		/* Native PCIe Enclosure Management */
#endif
#ifdef CONFIG_PCI_IDE
	u16		ide_cap;	/* Link Integrity & Data Encryption */
	u8		nr_ide_mem;	/* Address association resources for streams */
	u8		nr_link_ide;	/* Link Stream count (Selective Stream offset) */
	u16		nr_sel_ide;	/* Selective Stream count (register block allocator) */
	struct ida	ide_stream_ida;
	unsigned int	ide_cfg:1;	/* Config cycles over IDE */
	unsigned int	ide_tee_limit:1; /* Disallow T=0 traffic over IDE */
#endif
#ifdef CONFIG_PCI_TSM
	struct pci_tsm *tsm;		/* TSM operation state */
#endif
	u16		acs_cap;	/* ACS Capability offset */
	u16		acs_capabilities; /* ACS Capabilities */
	u8		supported_speeds; /* Supported Link Speeds Vector */
	phys_addr_t	rom;		/* Physical address if not from BAR */
	size_t		romlen;		/* Length if not from BAR */
	unsigned long	priv_flags;	/* Private flags for the PCI driver */

	/* These methods index pci_reset_fn_methods[] */
	u8 reset_methods[PCI_NUM_RESET_METHODS]; /* In priority order */

	struct gpio_desc *wake;		/* WAKE# GPIO */

#ifdef CONFIG_PCIE_TPH
	u16		tph_cap;	/* TPH capability offset */
	u8		tph_mode;	/* TPH mode */
	u8		tph_req_type;	/* TPH requester type */
#endif
};

static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
{
#ifdef CONFIG_PCI_IOV
	if (dev->is_virtfn)
		dev = dev->physfn;
#endif
	return dev;
}

struct pci_dev *pci_alloc_dev(struct pci_bus *bus);

#define	to_pci_dev(n) container_of(n, struct pci_dev, dev)
#define for_each_pci_dev(d) while ((d = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)
#define for_each_pci_dev_reverse(d) \
	while ((d = pci_get_device_reverse(PCI_ANY_ID, PCI_ANY_ID, d)) != NULL)

static inline int pci_channel_offline(struct pci_dev *pdev)
{
	return (pdev->error_state != pci_channel_io_normal);
}

/*
 * Currently in ACPI spec, for each PCI host bridge, PCI Segment
 * Group number is limited to a 16-bit value, therefore (int)-1 is
 * not a valid PCI domain number, and can be used as a sentinel
 * value indicating ->domain_nr is not set by the driver (and
 * CONFIG_PCI_DOMAINS_GENERIC=y archs will set it with
 * pci_bus_find_domain_nr()).
 */
#define PCI_DOMAIN_NR_NOT_SET (-1)

struct pci_host_bridge {
	struct device	dev;
	struct pci_bus	*bus;		/* Root bus */
	struct pci_ops	*ops;
	struct pci_ops	*child_ops;
	void		*sysdata;
	int		busnr;
	int		domain_nr;
	struct list_head windows;	/* resource_entry */
	struct list_head dma_ranges;	/* dma ranges resource list */
	struct list_head ports;		/* Root Port list (pci_host_port) */
#ifdef CONFIG_PCI_IDE
	u16 nr_ide_streams; /* Max streams possibly active in @ide_stream_ida */
	struct ida ide_stream_ida;
	struct ida ide_stream_ids_ida; /* track unique ids per domain */
#endif
	u8 (*swizzle_irq)(struct pci_dev *, u8 *); /* Platform IRQ swizzler */
	int (*map_irq)(const struct pci_dev *, u8, u8);
	void (*release_fn)(struct pci_host_bridge *);
	int (*enable_device)(struct pci_host_bridge *bridge, struct pci_dev *dev);
	void (*disable_device)(struct pci_host_bridge *bridge, struct pci_dev *dev);
	int (*reset_root_port)(struct pci_host_bridge *bridge, struct pci_dev *dev);
	void		*release_data;
	unsigned int	ignore_reset_delay:1;	/* For entire hierarchy */
	unsigned int	no_ext_tags:1;		/* No Extended Tags */
	unsigned int	no_inc_mrrs:1;		/* No Increase MRRS */
	unsigned int	native_aer:1;		/* OS may use PCIe AER */
	unsigned int	native_pcie_hotplug:1;	/* OS may use PCIe hotplug */
	unsigned int	native_shpc_hotplug:1;	/* OS may use SHPC hotplug */
	unsigned int	native_pme:1;		/* OS may use PCIe PME */
	unsigned int	native_ltr:1;		/* OS may use PCIe LTR */
	unsigned int	native_dpc:1;		/* OS may use PCIe DPC */
	unsigned int	native_cxl_error:1;	/* OS may use CXL RAS/Events */
	unsigned int	preserve_config:1;	/* Preserve FW resource setup */
	unsigned int	size_windows:1;		/* Enable root bus sizing */
	unsigned int	msi_domain:1;		/* Bridge wants MSI domain */
	unsigned int	broken_l1ss_resume:1;	/* Resuming from L1SS during
						   system suspend is broken */

	/* Resource alignment requirements */
	resource_size_t (*align_resource)(struct pci_dev *dev,
			const struct resource *res,
			resource_size_t start,
			resource_size_t size,
			resource_size_t align);
	unsigned long	private[] ____cacheline_aligned;
};

#define	to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)

static inline void *pci_host_bridge_priv(struct pci_host_bridge *bridge)
{
	return (void *)bridge->private;
}

static inline struct pci_host_bridge *pci_host_bridge_from_priv(void *priv)
{
	return container_of(priv, struct pci_host_bridge, private);
}

struct pci_host_bridge *pci_alloc_host_bridge(size_t priv);
struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
						   size_t priv);
void pci_free_host_bridge(struct pci_host_bridge *bridge);
struct device *pci_get_host_bridge_device(struct pci_dev *dev);
struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus);

void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
				 void (*release_fn)(struct pci_host_bridge *),
				 void *release_data);

int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge);

#define PCI_REGION_FLAG_MASK	0x0fU	/* These bits of resource flags tell us the PCI region flags */

struct pci_bus {
	struct list_head node;		/* Node in list of buses */
	struct pci_bus	*parent;	/* Parent bus this bridge is on */
	struct list_head children;	/* List of child buses */
	struct list_head devices;	/* List of devices on this bus */
	struct pci_dev	*self;		/* Bridge device as seen by parent */
	struct list_head slots;		/* List of slots on this bus;
					   protected by pci_slot_mutex */
	struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
	struct list_head resources;	/* Address space routed to this bus */
	struct resource busn_res;	/* Bus numbers routed to this bus */

	struct pci_ops	*ops;		/* Configuration access functions */
	void		*sysdata;	/* Hook for sys-specific extension */
	struct proc_dir_entry *procdir;	/* Directory entry in /proc/bus/pci */

	unsigned char	number;		/* Bus number */
	unsigned char	primary;	/* Number of primary bridge */
	unsigned char	max_bus_speed;	/* enum pci_bus_speed */
	unsigned char	cur_bus_speed;	/* enum pci_bus_speed */
#ifdef CONFIG_PCI_DOMAINS_GENERIC
	int		domain_nr;
#endif

	char		name[48];

	unsigned short	bridge_ctl;	/* Manage NO_ISA/FBB/et al behaviors */
	pci_bus_flags_t bus_flags;	/* Inherited by child buses */
	struct device		*bridge;
	struct device		dev;
	unsigned int		is_added:1;
	unsigned int		unsafe_warn:1;	/* warned about RW1C config write */
	unsigned int		flit_mode:1;	/* Link in Flit mode */
};

#define to_pci_bus(n)	container_of(n, struct pci_bus, dev)

static inline u16 pci_dev_id(struct pci_dev *dev)
{
	return PCI_DEVID(dev->bus->number, dev->devfn);
}

/*
 * Returns true if the PCI bus is root (behind host-PCI bridge),
 * false otherwise
 *
 * Some code assumes that "bus->self == NULL" means that bus is a root bus.
 * This is incorrect because "virtual" buses added for SR-IOV (via
 * virtfn_add_bus()) have "bus->self == NULL" but are not root buses.
 */
static inline bool pci_is_root_bus(struct pci_bus *pbus)
{
	return !(pbus->parent);
}

/**
 * pci_is_bridge - check if the PCI device is a bridge
 * @dev: PCI device
 *
 * Return true if the PCI device is bridge whether it has subordinate
 * or not.
 */
static inline bool pci_is_bridge(struct pci_dev *dev)
{
	return dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
		dev->hdr_type == PCI_HEADER_TYPE_CARDBUS;
}

/**
 * pci_is_vga - check if the PCI device is a VGA device
 * @pdev: PCI device
 *
 * The PCI Code and ID Assignment spec, r1.15, secs 1.4 and 1.1, define
 * VGA Base Class and Sub-Classes:
 *
 *   03 00  PCI_CLASS_DISPLAY_VGA      VGA-compatible or 8514-compatible
 *   00 01  PCI_CLASS_NOT_DEFINED_VGA  VGA-compatible (before Class Code)
 *
 * Return true if the PCI device is a VGA device and uses the legacy VGA
 * resources ([mem 0xa0000-0xbffff], [io 0x3b0-0x3bb], [io 0x3c0-0x3df] and
 * aliases).
 */
static inline bool pci_is_vga(struct pci_dev *pdev)
{
	if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
		return true;

	if ((pdev->class >> 8) == PCI_CLASS_NOT_DEFINED_VGA)
		return true;

	return false;
}

/**
 * pci_is_display - check if the PCI device is a display controller
 * @pdev: PCI device
 *
 * Determine whether the given PCI device corresponds to a display
 * controller. Display controllers are typically used for graphical output
 * and are identified based on their class code.
 *
 * Return: true if the PCI device is a display controller, false otherwise.
 */
static inline bool pci_is_display(struct pci_dev *pdev)
{
	return (pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY;
}

static inline bool pcie_is_cxl(struct pci_dev *pci_dev)
{
	return pci_dev->is_cxl;
}

#define for_each_pci_bridge(dev, bus)				\
	list_for_each_entry(dev, &bus->devices, bus_list)	\
		if (!pci_is_bridge(dev)) {} else

static inline struct pci_dev *pci_upstream_bridge(struct pci_dev *dev)
{
	dev = pci_physfn(dev);
	if (pci_is_root_bus(dev->bus))
		return NULL;

	return dev->bus->self;
}

#ifdef CONFIG_PCI_MSI
static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
{
	return pci_dev->msi_enabled || pci_dev->msix_enabled;
}
#else
static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) { return false; }
#endif

/* Error values that may be returned by PCI functions */
#define PCIBIOS_SUCCESSFUL		0x00
#define PCIBIOS_FUNC_NOT_SUPPORTED	0x81
#define PCIBIOS_BAD_VENDOR_ID		0x83
#define PCIBIOS_DEVICE_NOT_FOUND	0x86
#define PCIBIOS_BAD_REGISTER_NUMBER	0x87
#define PCIBIOS_SET_FAILED		0x88
#define PCIBIOS_BUFFER_TOO_SMALL	0x89

/* Translate above to generic errno for passing back through non-PCI code */
static inline int pcibios_err_to_errno(int err)
{
	if (err <= PCIBIOS_SUCCESSFUL)
		return err; /* Assume already errno */

	switch (err) {
	case PCIBIOS_FUNC_NOT_SUPPORTED:
		return -ENOENT;
	case PCIBIOS_BAD_VENDOR_ID:
		return -ENOTTY;
	case PCIBIOS_DEVICE_NOT_FOUND:
		return -ENODEV;
	case PCIBIOS_BAD_REGISTER_NUMBER:
		return -EFAULT;
	case PCIBIOS_SET_FAILED:
		return -EIO;
	case PCIBIOS_BUFFER_TOO_SMALL:
		return -ENOSPC;
	}

	return -ERANGE;
}

/* Low-level architecture-dependent routines */

struct pci_ops {
	int (*add_bus)(struct pci_bus *bus);
	void (*remove_bus)(struct pci_bus *bus);
	void __iomem *(*map_bus)(struct pci_bus *bus, unsigned int devfn, int where);
	int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
	int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
};

/*
 * ACPI needs to be able to access PCI config space before we've done a
 * PCI bus scan and created pci_bus structures.
 */
int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
		 int reg, int len, u32 *val);
int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
		  int reg, int len, u32 val);

#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
typedef u64 pci_bus_addr_t;
#else
typedef u32 pci_bus_addr_t;
#endif

struct pci_bus_region {
	pci_bus_addr_t	start;
	pci_bus_addr_t	end;
};

static inline pci_bus_addr_t pci_bus_region_size(const struct pci_bus_region *region)
{
	return region->end - region->start + 1;
}

struct pci_dynids {
	spinlock_t		lock;	/* Protects list, index */
	struct list_head	list;	/* For IDs added at runtime */
};


/*
 * PCI Error Recovery System (PCI-ERS).  If a PCI device driver provides
 * a set of callbacks in struct pci_error_handlers, that device driver
 * will be notified of PCI bus errors, and will be driven to recovery
 * when an error occurs.
 */

typedef unsigned int __bitwise pci_ers_result_t;

enum pci_ers_result {
	/* No result/none/not supported in device driver */
	PCI_ERS_RESULT_NONE = (__force pci_ers_result_t) 1,

	/* Device driver can recover without slot reset */
	PCI_ERS_RESULT_CAN_RECOVER = (__force pci_ers_result_t) 2,

	/* Device driver wants slot to be reset */
	PCI_ERS_RESULT_NEED_RESET = (__force pci_ers_result_t) 3,

	/* Device has completely failed, is unrecoverable */
	PCI_ERS_RESULT_DISCONNECT = (__force pci_ers_result_t) 4,

	/* Device driver is fully recovered and operational */
	PCI_ERS_RESULT_RECOVERED = (__force pci_ers_result_t) 5,

	/* No AER capabilities registered for the driver */
	PCI_ERS_RESULT_NO_AER_DRIVER = (__force pci_ers_result_t) 6,
};

/* PCI bus error event callbacks */
struct pci_error_handlers {
	/* PCI bus error detected on this device */
	pci_ers_result_t (*error_detected)(struct pci_dev *dev,
					   pci_channel_state_t error);

	/* MMIO has been re-enabled, but not DMA */
	pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev);

	/* PCI slot has been reset */
	pci_ers_result_t (*slot_reset)(struct pci_dev *dev);

	/* PCI function reset prepare or completed */
	void (*reset_prepare)(struct pci_dev *dev);
	void (*reset_done)(struct pci_dev *dev);

	/* Device driver may resume normal operations */
	void (*resume)(struct pci_dev *dev);

	/* Allow device driver to record more details of a correctable error */
	void (*cor_error_detected)(struct pci_dev *dev);
};


struct module;

/**
 * struct pci_driver - PCI driver structure
 * @name:	Driver name.
 * @id_table:	Pointer to table of device IDs the driver is
 *		interested in.  Most drivers should export this
 *		table using MODULE_DEVICE_TABLE(pci,...).
 * @probe:	This probing function gets called (during execution
 *		of pci_register_driver() for already existing
 *		devices or later if a new device gets inserted) for
 *		all PCI devices which match the ID table and are not
 *		"owned" by the other drivers yet. This function gets
 *		passed a "struct pci_dev \*" for each device whose
 *		entry in the ID table matches the device. The probe
 *		function returns zero when the driver chooses to
 *		take "ownership" of the device or an error code
 *		(negative number) otherwise.
 *		The pci_device_id parameter is only valid during probe.
 *		The probe function always gets called from process
 *		context, so it can sleep.
 * @remove:	The remove() function gets called whenever a device
 *		being handled by this driver is removed (either during
 *		deregistration of the driver or when it's manually
 *		pulled out of a hot-pluggable slot).
 *		The remove function always gets called from process
 *		context, so it can sleep.
 * @suspend:	Put device into low power state.
 * @resume:	Wake device from low power state.
 *		(Please see Documentation/power/pci.rst for descriptions
 *		of PCI Power Management and the related functions.)
 * @shutdown:	Hook into reboot_notifier_list (kernel/sys.c).
 *		Intended to stop any idling DMA operations.
 *		Useful for enabling wake-on-lan (NIC) or changing
 *		the power state of a device before reboot.
 *		e.g. drivers/net/e100.c.
 * @sriov_configure: Optional driver callback to allow configuration of
 *		number of VFs to enable via sysfs "sriov_numvfs" file.
 * @sriov_set_msix_vec_count: PF Driver callback to change number of MSI-X
 *              vectors on a VF. Triggered via sysfs "sriov_vf_msix_count".
 *              This will change MSI-X Table Size in the VF Message Control
 *              registers.
 * @sriov_get_vf_total_msix: PF driver callback to get the total number of
 *              MSI-X vectors available for distribution to the VFs.
 * @err_handler: See Documentation/PCI/pci-error-recovery.rst
 * @groups:	Sysfs attribute groups.
 * @dev_groups: Attributes attached to the device that will be
 *              created once it is bound to the driver.
 * @driver:	Driver model structure.
 * @dynids:	List of dynamically added device IDs.
 * @driver_managed_dma: Device driver doesn't use kernel DMA API for DMA.
 *		For most device drivers, no need to care about this flag
 *		as long as all DMAs are handled through the kernel DMA API.
 *		For some special ones, for example VFIO drivers, they know
 *		how to manage the DMA themselves and set this flag so that
 *		the IOMMU layer will allow them to setup and manage their
 *		own I/O address space.
 */
struct pci_driver {
	const char		*name;
	const struct pci_device_id *id_table;	/* Must be non-NULL for probe to be called */
	int  (*probe)(struct pci_dev *dev, const struct pci_device_id *id);	/* New device inserted */
	void (*remove)(struct pci_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
	int  (*suspend)(struct pci_dev *dev, pm_message_t state);	/* Device suspended */
	int  (*resume)(struct pci_dev *dev);	/* Device woken up */
	void (*shutdown)(struct pci_dev *dev);
	int  (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */
	int  (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */
	u32  (*sriov_get_vf_total_msix)(struct pci_dev *pf);
	const struct pci_error_handlers *err_handler;
	const struct attribute_group **groups;
	const struct attribute_group **dev_groups;
	struct device_driver	driver;
	struct pci_dynids	dynids;
	bool driver_managed_dma;
};

#define to_pci_driver(__drv)	\
	( __drv ? container_of_const(__drv, struct pci_driver, driver) : NULL )

/**
 * PCI_DEVICE - macro used to describe a specific PCI device
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device.  The subvendor and subdevice fields will be set to
 * PCI_ANY_ID.
 */
#define PCI_DEVICE(vend,dev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_DEVICE_DRIVER_OVERRIDE - macro used to describe a PCI device with
 *                              override_only flags.
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 * @driver_override: the 32 bit PCI Device override_only
 *
 * This macro is used to create a struct pci_device_id that matches only a
 * driver_override device. The subvendor and subdevice fields will be set to
 * PCI_ANY_ID.
 */
#define PCI_DEVICE_DRIVER_OVERRIDE(vend, dev, driver_override) \
	.vendor = (vend), .device = (dev), .subvendor = PCI_ANY_ID, \
	.subdevice = PCI_ANY_ID, .override_only = (driver_override)

/**
 * PCI_DRIVER_OVERRIDE_DEVICE_VFIO - macro used to describe a VFIO
 *                                   "driver_override" PCI device.
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device. The subvendor and subdevice fields will be set to
 * PCI_ANY_ID and the driver_override will be set to
 * PCI_ID_F_VFIO_DRIVER_OVERRIDE.
 */
#define PCI_DRIVER_OVERRIDE_DEVICE_VFIO(vend, dev) \
	PCI_DEVICE_DRIVER_OVERRIDE(vend, dev, PCI_ID_F_VFIO_DRIVER_OVERRIDE)

/**
 * PCI_DEVICE_SUB - macro used to describe a specific PCI device with subsystem
 * @vend: the 16 bit PCI Vendor ID
 * @dev: the 16 bit PCI Device ID
 * @subvend: the 16 bit PCI Subvendor ID
 * @subdev: the 16 bit PCI Subdevice ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific device with subsystem information.
 */
#define PCI_DEVICE_SUB(vend, dev, subvend, subdev) \
	.vendor = (vend), .device = (dev), \
	.subvendor = (subvend), .subdevice = (subdev)

/**
 * PCI_DEVICE_CLASS - macro used to describe a specific PCI device class
 * @dev_class: the class, subclass, prog-if triple for this device
 * @dev_class_mask: the class mask for this device
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI class.  The vendor, device, subvendor, and subdevice
 * fields will be set to PCI_ANY_ID.
 */
#define PCI_DEVICE_CLASS(dev_class,dev_class_mask) \
	.class = (dev_class), .class_mask = (dev_class_mask), \
	.vendor = PCI_ANY_ID, .device = PCI_ANY_ID, \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID

/**
 * PCI_VDEVICE - macro used to describe a specific PCI device in short form
 * @vend: the vendor name
 * @dev: the 16 bit PCI Device ID
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI device.  The subvendor, and subdevice fields will be set
 * to PCI_ANY_ID. The macro allows the next field to follow as the device
 * private data.
 */
#define PCI_VDEVICE(vend, dev) \
	.vendor = PCI_VENDOR_ID_##vend, .device = (dev), \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, 0, 0

/**
 * PCI_VDEVICE_SUB - describe a specific PCI device/subdevice in a short form
 * @vend: the vendor name
 * @dev: the 16 bit PCI Device ID
 * @subvend: the 16 bit PCI Subvendor ID
 * @subdev: the 16 bit PCI Subdevice ID
 *
 * Generate the pci_device_id struct layout for the specific PCI
 * device/subdevice. Private data may follow the output.
 */
#define PCI_VDEVICE_SUB(vend, dev, subvend, subdev) \
	.vendor = PCI_VENDOR_ID_##vend, .device = (dev), \
	.subvendor = (subvend), .subdevice = (subdev), 0, 0

/**
 * PCI_DEVICE_DATA - macro used to describe a specific PCI device in very short form
 * @vend: the vendor name (without PCI_VENDOR_ID_ prefix)
 * @dev: the device name (without PCI_DEVICE_ID_<vend>_ prefix)
 * @data: the driver data to be filled
 *
 * This macro is used to create a struct pci_device_id that matches a
 * specific PCI device.  The subvendor, and subdevice fields will be set
 * to PCI_ANY_ID.
 */
#define PCI_DEVICE_DATA(vend, dev, data) \
	.vendor = PCI_VENDOR_ID_##vend, .device = PCI_DEVICE_ID_##vend##_##dev, \
	.subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, 0, 0, \
	.driver_data = (kernel_ulong_t)(data)

enum {
	PCI_REASSIGN_ALL_RSRC	= 0x00000001,	/* Ignore firmware setup */
	PCI_REASSIGN_ALL_BUS	= 0x00000002,	/* Reassign all bus numbers */
	PCI_PROBE_ONLY		= 0x00000004,	/* Use existing setup */
	PCI_CAN_SKIP_ISA_ALIGN	= 0x00000008,	/* Don't do ISA alignment */
	PCI_ENABLE_PROC_DOMAINS	= 0x00000010,	/* Enable domains in /proc */
	PCI_COMPAT_DOMAIN_0	= 0x00000020,	/* ... except domain 0 */
	PCI_SCAN_ALL_PCIE_DEVS	= 0x00000040,	/* Scan all, not just dev 0 */
};

#define PCI_IRQ_INTX		(1 << 0) /* Allow INTx interrupts */
#define PCI_IRQ_MSI		(1 << 1) /* Allow MSI interrupts */
#define PCI_IRQ_MSIX		(1 << 2) /* Allow MSI-X interrupts */
#define PCI_IRQ_AFFINITY	(1 << 3) /* Auto-assign affinity */

/* These external functions are only available when PCI support is enabled */
#ifdef CONFIG_PCI

/* PCI legacy I/O port and memory address space sizes. */
#define PCI_LEGACY_IO_SIZE	(SZ_64K - 1)
#define PCI_LEGACY_MEM_SIZE	SZ_1M

extern unsigned int pci_flags;

static inline void pci_set_flags(int flags) { pci_flags = flags; }
static inline void pci_add_flags(int flags) { pci_flags |= flags; }
static inline void pci_clear_flags(int flags) { pci_flags &= ~flags; }
static inline int pci_has_flag(int flag) { return pci_flags & flag; }

void pcie_bus_configure_settings(struct pci_bus *bus);

enum pcie_bus_config_types {
	PCIE_BUS_TUNE_OFF,	/* Don't touch MPS at all */
	PCIE_BUS_DEFAULT,	/* Ensure MPS matches upstream bridge */
	PCIE_BUS_SAFE,		/* Use largest MPS boot-time devices support */
	PCIE_BUS_PERFORMANCE,	/* Use MPS and MRRS for best performance */
	PCIE_BUS_PEER2PEER,	/* Set MPS = 128 for all devices */
};

extern enum pcie_bus_config_types pcie_bus_config;

extern const struct bus_type pci_bus_type;

/* Do NOT directly access these two variables, unless you are arch-specific PCI
 * code, or PCI core code. */
extern struct list_head pci_root_buses;	/* List of all known PCI buses */

void pcibios_resource_survey_bus(struct pci_bus *bus);
void pcibios_bus_add_device(struct pci_dev *pdev);
void pcibios_add_bus(struct pci_bus *bus);
void pcibios_remove_bus(struct pci_bus *bus);
void pcibios_fixup_bus(struct pci_bus *);
int __must_check pcibios_enable_device(struct pci_dev *, int mask);
/* Architecture-specific versions may override this (weak) */
char *pcibios_setup(char *str);

/* Used only when drivers/pci/setup.c is used */
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
				       const struct resource *empty_res,
				       resource_size_t size,
				       resource_size_t align);
resource_size_t pci_align_resource(struct pci_dev *dev,
				   const struct resource *res,
				   const struct resource *empty_res,
				   resource_size_t size,
				   resource_size_t align);

/* Generic PCI functions used internally */

void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
			     struct resource *res);
void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
			     struct pci_bus_region *region);
void pcibios_scan_specific_bus(int busn);
struct pci_bus *pci_find_bus(int domain, int busnr);
void pci_bus_add_devices(const struct pci_bus *bus);
struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
				    struct pci_ops *ops, void *sysdata,
				    struct list_head *resources);
int pci_host_probe(struct pci_host_bridge *bridge);
void pci_probe_flush_workqueue(void);
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
void pci_bus_release_busn_res(struct pci_bus *b);
struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
				  struct pci_ops *ops, void *sysdata,
				  struct list_head *resources);
int pci_scan_root_bus_bridge(struct pci_host_bridge *bridge);
struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
				int busnr);
struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
				 const char *name,
				 struct hotplug_slot *hotplug);
void pci_destroy_slot(struct pci_slot *slot);
#ifdef CONFIG_SYSFS
void pci_dev_assign_slot(struct pci_dev *dev);
#else
static inline void pci_dev_assign_slot(struct pci_dev *dev) { }
#endif
int pci_scan_slot(struct pci_bus *bus, int devfn);
struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus);
unsigned int pci_scan_child_bus(struct pci_bus *bus);
void pci_bus_add_device(struct pci_dev *dev);
void pci_read_bridge_bases(struct pci_bus *child);
struct resource *pci_find_parent_resource(const struct pci_dev *dev,
					  struct resource *res);
u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin);
int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
struct pci_dev *pci_dev_get(struct pci_dev *dev);
void pci_dev_put(struct pci_dev *dev);
DEFINE_FREE(pci_dev_put, struct pci_dev *, if (_T) pci_dev_put(_T))
void pci_remove_bus(struct pci_bus *b);
void pci_stop_and_remove_bus_device(struct pci_dev *dev);
void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev);
void pci_stop_root_bus(struct pci_bus *bus);
void pci_remove_root_bus(struct pci_bus *bus);
#ifdef CONFIG_CARDBUS
void pci_setup_cardbus_bridge(struct pci_bus *bus);
#else
static inline void pci_setup_cardbus_bridge(struct pci_bus *bus) { }
#endif
void pcibios_setup_bridge(struct pci_bus *bus, unsigned long type);
void pci_sort_breadthfirst(void);
#define dev_is_pci(d) ((d)->bus == &pci_bus_type)
#define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false))

/* Generic PCI functions exported to card drivers */

u8 pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
u8 pci_find_capability(struct pci_dev *dev, int cap);
u8 pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
u8 pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
u8 pci_find_next_ht_capability(struct pci_dev *dev, u8 pos, int ht_cap);
u16 pci_find_ext_capability(struct pci_dev *dev, int cap);
u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 pos, int cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap);
u16 pci_find_dvsec_capability(struct pci_dev *dev, u16 vendor, u16 dvsec);

u64 pci_get_dsn(struct pci_dev *dev);

struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
			       struct pci_dev *from);
struct pci_dev *pci_get_device_reverse(unsigned int vendor, unsigned int device,
				       struct pci_dev *from);
struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,
			       unsigned int ss_vendor, unsigned int ss_device,
			       struct pci_dev *from);
struct pci_dev *pci_get_slot(struct pci_bus *bus, unsigned int devfn);
struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
					    unsigned int devfn);
struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from);
struct pci_dev *pci_get_base_class(unsigned int class, struct pci_dev *from);

int pci_dev_present(const struct pci_device_id *ids);

int pci_bus_read_config_byte(struct pci_bus *bus, unsigned int devfn,
			     int where, u8 *val);
int pci_bus_read_config_word(struct pci_bus *bus, unsigned int devfn,
			     int where, u16 *val);
int pci_bus_read_config_dword(struct pci_bus *bus, unsigned int devfn,
			      int where, u32 *val);
int pci_bus_write_config_byte(struct pci_bus *bus, unsigned int devfn,
			      int where, u8 val);
int pci_bus_write_config_word(struct pci_bus *bus, unsigned int devfn,
			      int where, u16 val);
int pci_bus_write_config_dword(struct pci_bus *bus, unsigned int devfn,
			       int where, u32 val);

int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,
			    int where, int size, u32 *val);
int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,
			    int where, int size, u32 val);
int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,
			      int where, int size, u32 *val);
int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,
			       int where, int size, u32 val);

struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops);

int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val);
int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val);
int pci_read_config_dword(const struct pci_dev *dev, int where, u32 *val);
int pci_write_config_byte(const struct pci_dev *dev, int where, u8 val);
int pci_write_config_word(const struct pci_dev *dev, int where, u16 val);
int pci_write_config_dword(const struct pci_dev *dev, int where, u32 val);
void pci_clear_and_set_config_dword(const struct pci_dev *dev, int pos,
				    u32 clear, u32 set);

int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val);
int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val);
int pcie_capability_write_word(struct pci_dev *dev, int pos, u16 val);
int pcie_capability_write_dword(struct pci_dev *dev, int pos, u32 val);
int pcie_capability_clear_and_set_word_unlocked(struct pci_dev *dev, int pos,
						u16 clear, u16 set);
int pcie_capability_clear_and_set_word_locked(struct pci_dev *dev, int pos,
					      u16 clear, u16 set);
int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos,
					u32 clear, u32 set);

/**
 * pcie_capability_clear_and_set_word - RMW accessor for PCI Express Capability Registers
 * @dev:	PCI device structure of the PCI Express device
 * @pos:	PCI Express Capability Register
 * @clear:	Clear bitmask
 * @set:	Set bitmask
 *
 * Perform a Read-Modify-Write (RMW) operation using @clear and @set
 * bitmasks on PCI Express Capability Register at @pos. Certain PCI Express
 * Capability Registers are accessed concurrently in RMW fashion, hence
 * require locking which is handled transparently to the caller.
 */
static inline int pcie_capability_clear_and_set_word(struct pci_dev *dev,
						     int pos,
						     u16 clear, u16 set)
{
	switch (pos) {
	case PCI_EXP_LNKCTL:
	case PCI_EXP_LNKCTL2:
	case PCI_EXP_RTCTL:
		return pcie_capability_clear_and_set_word_locked(dev, pos,
								 clear, set);
	default:
		return pcie_capability_clear_and_set_word_unlocked(dev, pos,
								   clear, set);
	}
}

static inline int pcie_capability_set_word(struct pci_dev *dev, int pos,
					   u16 set)
{
	return pcie_capability_clear_and_set_word(dev, pos, 0, set);
}

static inline int pcie_capability_set_dword(struct pci_dev *dev, int pos,
					    u32 set)
{
	return pcie_capability_clear_and_set_dword(dev, pos, 0, set);
}

static inline int pcie_capability_clear_word(struct pci_dev *dev, int pos,
					     u16 clear)
{
	return pcie_capability_clear_and_set_word(dev, pos, clear, 0);
}

static inline int pcie_capability_clear_dword(struct pci_dev *dev, int pos,
					      u32 clear)
{
	return pcie_capability_clear_and_set_dword(dev, pos, clear, 0);
}

/* User-space driven config access */
int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
int pci_user_read_config_dword(struct pci_dev *dev, int where, u32 *val);
int pci_user_write_config_byte(struct pci_dev *dev, int where, u8 val);
int pci_user_write_config_word(struct pci_dev *dev, int where, u16 val);
int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);

int __must_check pci_enable_device(struct pci_dev *dev);
int __must_check pci_enable_device_mem(struct pci_dev *dev);
int __must_check pci_reenable_device(struct pci_dev *);
int __must_check pcim_enable_device(struct pci_dev *pdev);
void pcim_pin_device(struct pci_dev *pdev);

static inline bool pci_intx_mask_supported(struct pci_dev *pdev)
{
	/*
	 * INTx masking is supported if PCI_COMMAND_INTX_DISABLE is
	 * writable and no quirk has marked the feature broken.
	 */
	return !pdev->broken_intx_masking;
}

static inline int pci_is_enabled(struct pci_dev *pdev)
{
	return (atomic_read(&pdev->enable_cnt) > 0);
}

static inline int pci_is_managed(struct pci_dev *pdev)
{
	return pdev->is_managed;
}

void pci_disable_device(struct pci_dev *dev);

extern unsigned int pcibios_max_latency;
void pci_set_master(struct pci_dev *dev);
void pci_clear_master(struct pci_dev *dev);

int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state);
int pci_set_cacheline_size(struct pci_dev *dev);
int __must_check pci_set_mwi(struct pci_dev *dev);
int __must_check pcim_set_mwi(struct pci_dev *dev);
int pci_try_set_mwi(struct pci_dev *dev);
void pci_clear_mwi(struct pci_dev *dev);
void pci_disable_parity(struct pci_dev *dev);
void pci_intx(struct pci_dev *dev, int enable);
bool pci_check_and_mask_intx(struct pci_dev *dev);
bool pci_check_and_unmask_intx(struct pci_dev *dev);
int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask);
int pci_wait_for_pending_transaction(struct pci_dev *dev);
int pcix_get_max_mmrbc(struct pci_dev *dev);
int pcix_get_mmrbc(struct pci_dev *dev);
int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc);
int pcie_get_readrq(struct pci_dev *dev);
int pcie_set_readrq(struct pci_dev *dev, int rq);
int pcie_get_mps(struct pci_dev *dev);
int pcie_set_mps(struct pci_dev *dev, int mps);
u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
			     enum pci_bus_speed *speed,
			     enum pcie_link_width *width);
int pcie_link_speed_mbps(struct pci_dev *pdev);
void pcie_print_link_status(struct pci_dev *dev);
int pcie_reset_flr(struct pci_dev *dev, bool probe);
int pcie_flr(struct pci_dev *dev);
int __pci_reset_function_locked(struct pci_dev *dev);
int pci_reset_function(struct pci_dev *dev);
int pci_reset_function_locked(struct pci_dev *dev);
int pci_try_reset_function(struct pci_dev *dev);
int pci_probe_reset_slot(struct pci_slot *slot);
int pci_probe_reset_bus(struct pci_bus *bus);
int pci_reset_bus(struct pci_dev *dev);
void pci_reset_secondary_bus(struct pci_dev *dev);
void pcibios_reset_secondary_bus(struct pci_dev *dev);
void pci_update_resource(struct pci_dev *dev, int resno);
int __must_check pci_assign_resource(struct pci_dev *dev, int i);
int pci_release_resource(struct pci_dev *dev, int resno);

/* Resizable BAR related routines */
int pci_rebar_bytes_to_size(u64 bytes);
resource_size_t pci_rebar_size_to_bytes(int size);
u64 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar);
bool pci_rebar_size_supported(struct pci_dev *pdev, int bar, int size);
int pci_rebar_get_max_size(struct pci_dev *pdev, int bar);
int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size,
				     int exclude_bars);

int pci_select_bars(struct pci_dev *dev, unsigned long flags);
bool pci_device_is_present(struct pci_dev *pdev);
void pci_ignore_hotplug(struct pci_dev *dev);
struct pci_dev *pci_real_dma_dev(struct pci_dev *dev);
int pci_status_get_and_clear_errors(struct pci_dev *pdev);

int __printf(6, 7) pci_request_irq(struct pci_dev *dev, unsigned int nr,
		irq_handler_t handler, irq_handler_t thread_fn, void *dev_id,
		const char *fmt, ...);
void pci_free_irq(struct pci_dev *dev, unsigned int nr, void *dev_id);

/* ROM control related routines */
int pci_enable_rom(struct pci_dev *pdev);
void pci_disable_rom(struct pci_dev *pdev);
void __iomem __must_check *pci_map_rom(struct pci_dev *pdev, size_t *size);
void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom);

/* Power management related routines */
int pci_save_state(struct pci_dev *dev);
void pci_restore_state(struct pci_dev *dev);
struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev);
int pci_load_saved_state(struct pci_dev *dev,
			 struct pci_saved_state *state);
int pci_load_and_free_saved_state(struct pci_dev *dev,
				  struct pci_saved_state **state);
int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state);
int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
int pci_set_power_state_locked(struct pci_dev *dev, pci_power_t state);
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state);
void pci_pme_active(struct pci_dev *dev, bool enable);
int pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable);
int pci_wake_from_d3(struct pci_dev *dev, bool enable);
int pci_prepare_to_sleep(struct pci_dev *dev);
int pci_back_from_sleep(struct pci_dev *dev);
bool pci_dev_run_wake(struct pci_dev *dev);
void pci_d3cold_enable(struct pci_dev *dev);
void pci_d3cold_disable(struct pci_dev *dev);
bool pcie_relaxed_ordering_enabled(struct pci_dev *dev);
void pci_resume_bus(struct pci_bus *bus);
void pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state);

/* For use by arch with custom probe code */
void set_pcie_port_type(struct pci_dev *pdev);
void set_pcie_hotplug_bridge(struct pci_dev *pdev);

/* Functions for PCI Hotplug drivers to use */
unsigned int pci_rescan_bus(struct pci_bus *bus);
void pci_lock_rescan_remove(void);
void pci_unlock_rescan_remove(void);

/* Vital Product Data routines */
ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
ssize_t pci_read_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
ssize_t pci_write_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);

/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_claim_resources(struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
int pci_claim_bridge_resource(struct pci_dev *bridge, int i);
void pci_assign_unassigned_resources(void);
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
void pci_assign_unassigned_bus_resources(struct pci_bus *bus);
void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_assign_irq(struct pci_dev *dev);
struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res);
#define HAVE_PCI_REQ_REGIONS	2
int __must_check pci_request_regions(struct pci_dev *, const char *);
int __must_check pci_request_regions_exclusive(struct pci_dev *, const char *);
void pci_release_regions(struct pci_dev *);
int __must_check pci_request_region(struct pci_dev *, int, const char *);
void pci_release_region(struct pci_dev *, int);
int pci_request_selected_regions(struct pci_dev *, int, const char *);
int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
void pci_release_selected_regions(struct pci_dev *, int);

static inline __must_check struct resource *
pci_request_config_region_exclusive(struct pci_dev *pdev, unsigned int offset,
				    unsigned int len, const char *name)
{
	return __request_region(&pdev->driver_exclusive_resource, offset, len,
				name, IORESOURCE_EXCLUSIVE);
}

static inline void pci_release_config_region(struct pci_dev *pdev,
					     unsigned int offset,
					     unsigned int len)
{
	__release_region(&pdev->driver_exclusive_resource, offset, len);
}

/* drivers/pci/bus.c */
void pci_add_resource(struct list_head *resources, struct resource *res);
void pci_add_resource_offset(struct list_head *resources, struct resource *res,
			     resource_size_t offset);
void pci_free_resource_list(struct list_head *resources);
void pci_bus_add_resource(struct pci_bus *bus, struct resource *res);
struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
void pci_bus_remove_resources(struct pci_bus *bus);
void pci_bus_remove_resource(struct pci_bus *bus, struct resource *res);
int devm_request_pci_bus_resources(struct device *dev,
				   struct list_head *resources);

/* Temporary until new and working PCI SBR API in place */
int pci_bridge_secondary_bus_reset(struct pci_dev *dev);

#define __pci_bus_for_each_res0(bus, res, ...)				\
	for (unsigned int __b = 0;					\
	     (res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
	     __b++)

#define __pci_bus_for_each_res1(bus, res, __b)				\
	for (__b = 0;							\
	     (res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
	     __b++)

/**
 * pci_bus_for_each_resource - iterate over PCI bus resources
 * @bus: the PCI bus
 * @res: pointer to the current resource
 * @...: optional index of the current resource
 *
 * Iterate over PCI bus resources. The first part is to go over PCI bus
 * resource array, which has at most the %PCI_BRIDGE_RESOURCE_NUM entries.
 * After that continue with the separate list of the additional resources,
 * if not empty. That's why the Logical OR is being used.
 *
 * Possible usage:
 *
 *	struct pci_bus *bus = ...;
 *	struct resource *res;
 *	unsigned int i;
 *
 * 	// With optional index
 * 	pci_bus_for_each_resource(bus, res, i)
 * 		pr_info("PCI bus resource[%u]: %pR\n", i, res);
 *
 * 	// Without index
 * 	pci_bus_for_each_resource(bus, res)
 * 		_do_something_(res);
 */
#define pci_bus_for_each_resource(bus, res, ...)			\
	CONCATENATE(__pci_bus_for_each_res, COUNT_ARGS(__VA_ARGS__))	\
		    (bus, res, __VA_ARGS__)

int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
			struct resource *res, resource_size_t size,
			resource_size_t align, resource_size_t min,
			unsigned long type_mask,
			resource_alignf alignf,
			void *alignf_data);


int pci_register_io_range(const struct fwnode_handle *fwnode, phys_addr_t addr,
			resource_size_t size);
unsigned long pci_address_to_pio(phys_addr_t addr);
phys_addr_t pci_pio_to_address(unsigned long pio);
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
int devm_pci_remap_iospace(struct device *dev, const struct resource *res,
			   phys_addr_t phys_addr);
void pci_unmap_iospace(struct resource *res);
void __iomem *devm_pci_remap_cfgspace(struct device *dev,
				      resource_size_t offset,
				      resource_size_t size);
void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
					  struct resource *res);

static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
{
	struct pci_bus_region region;

	pcibios_resource_to_bus(pdev->bus, &region, &pdev->resource[bar]);
	return region.start;
}

/* Proper probing supporting hot-pluggable devices */
int __must_check __pci_register_driver(struct pci_driver *, struct module *,
				       const char *mod_name);

/* pci_register_driver() must be a macro so KBUILD_MODNAME can be expanded */
#define pci_register_driver(driver)		\
	__pci_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)

void pci_unregister_driver(struct pci_driver *dev);

/**
 * module_pci_driver() - Helper macro for registering a PCI driver
 * @__pci_driver: pci_driver struct
 *
 * Helper macro for PCI drivers which do not do anything special in module
 * init/exit. This eliminates a lot of boilerplate. Each module may only
 * use this macro once, and calling it replaces module_init() and module_exit()
 */
#define module_pci_driver(__pci_driver) \
	module_driver(__pci_driver, pci_register_driver, pci_unregister_driver)

/**
 * builtin_pci_driver() - Helper macro for registering a PCI driver
 * @__pci_driver: pci_driver struct
 *
 * Helper macro for PCI drivers which do not do anything special in their
 * init code. This eliminates a lot of boilerplate. Each driver may only
 * use this macro once, and calling it replaces device_initcall(...)
 */
#define builtin_pci_driver(__pci_driver) \
	builtin_driver(__pci_driver, pci_register_driver)

struct pci_driver *pci_dev_driver(const struct pci_dev *dev);
int pci_add_dynid(struct pci_driver *drv,
		  unsigned int vendor, unsigned int device,
		  unsigned int subvendor, unsigned int subdevice,
		  unsigned int class, unsigned int class_mask,
		  unsigned long driver_data);
const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
					 struct pci_dev *dev);
int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
		    int pass);

void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
		  void *userdata);
void pci_walk_bus_reverse(struct pci_bus *top,
			  int (*cb)(struct pci_dev *, void *), void *userdata);
int pci_cfg_space_size(struct pci_dev *dev);
unsigned char pci_bus_max_busnr(struct pci_bus *bus);
resource_size_t pcibios_window_alignment(struct pci_bus *bus,
					 unsigned long type);

#define PCI_VGA_STATE_CHANGE_BRIDGE (1 << 0)
#define PCI_VGA_STATE_CHANGE_DECODES (1 << 1)

int pci_set_vga_state(struct pci_dev *pdev, bool decode,
		      unsigned int command_bits, u32 flags);

/*
 * Virtual interrupts allow for more interrupts to be allocated
 * than the device has interrupts for. These are not programmed
 * into the device's MSI-X table and must be handled by some
 * other driver means.
 */
#define PCI_IRQ_VIRTUAL		(1 << 4)

#define PCI_IRQ_ALL_TYPES	(PCI_IRQ_INTX | PCI_IRQ_MSI | PCI_IRQ_MSIX)

#include <linux/dmapool.h>

struct msix_entry {
	u32	vector;	/* Kernel uses to write allocated vector */
	u16	entry;	/* Driver uses to specify entry, OS writes */
};

#ifdef CONFIG_PCI_MSI
int pci_msi_vec_count(struct pci_dev *dev);
void pci_disable_msi(struct pci_dev *dev);
int pci_msix_vec_count(struct pci_dev *dev);
void pci_disable_msix(struct pci_dev *dev);
void pci_restore_msi_state(struct pci_dev *dev);
bool pci_msi_enabled(void);
int pci_enable_msi(struct pci_dev *dev);
int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
			  int minvec, int maxvec);
static inline int pci_enable_msix_exact(struct pci_dev *dev,
					struct msix_entry *entries, int nvec)
{
	int rc = pci_enable_msix_range(dev, entries, nvec, nvec);
	if (rc < 0)
		return rc;
	return 0;
}
int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
			  unsigned int max_vecs, unsigned int flags);
int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
				   unsigned int max_vecs, unsigned int flags,
				   struct irq_affinity *affd);

bool pci_msix_can_alloc_dyn(struct pci_dev *dev);
struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
				     const struct irq_affinity_desc *affdesc);
void pci_msix_free_irq(struct pci_dev *pdev, struct msi_map map);

void pci_free_irq_vectors(struct pci_dev *dev);
int pci_irq_vector(struct pci_dev *dev, unsigned int nr);
const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec);

/**
 * pci_irq_type - Get the interrupt type of a PCI device
 * @pdev: the PCI device to operate on
 *
 * Discriminate the interrupt type the PCI core selected for this device
 * after a successful pci_alloc_irq_vectors() call.
 *
 * Return: %PCI_IRQ_MSIX, %PCI_IRQ_MSI, or %PCI_IRQ_INTX.
 */
static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
	if (pdev->msix_enabled)
		return PCI_IRQ_MSIX;

	if (pdev->msi_enabled)
		return PCI_IRQ_MSI;

	return PCI_IRQ_INTX;
}

#else
static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
static inline void pci_disable_msi(struct pci_dev *dev) { }
static inline int pci_msix_vec_count(struct pci_dev *dev) { return -ENOSYS; }
static inline void pci_disable_msix(struct pci_dev *dev) { }
static inline void pci_restore_msi_state(struct pci_dev *dev) { }
static inline bool pci_msi_enabled(void) { return false; }
static inline int pci_enable_msi(struct pci_dev *dev)
{ return -ENOSYS; }
static inline int pci_enable_msix_range(struct pci_dev *dev,
			struct msix_entry *entries, int minvec, int maxvec)
{ return -ENOSYS; }
static inline int pci_enable_msix_exact(struct pci_dev *dev,
			struct msix_entry *entries, int nvec)
{ return -ENOSYS; }

static inline int
pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
			       unsigned int max_vecs, unsigned int flags,
			       struct irq_affinity *aff_desc)
{
	if ((flags & PCI_IRQ_INTX) && min_vecs == 1 && dev->irq)
		return 1;
	return -ENOSPC;
}
static inline int
pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
		      unsigned int max_vecs, unsigned int flags)
{
	return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
					      flags, NULL);
}

static inline bool pci_msix_can_alloc_dyn(struct pci_dev *dev)
{ return false; }
static inline struct msi_map pci_msix_alloc_irq_at(struct pci_dev *dev, unsigned int index,
						   const struct irq_affinity_desc *affdesc)
{
	struct msi_map map = { .index = -ENOSYS, };

	return map;
}

static inline void pci_msix_free_irq(struct pci_dev *pdev, struct msi_map map)
{
}

static inline void pci_free_irq_vectors(struct pci_dev *dev)
{
}

static inline int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
{
	if (WARN_ON_ONCE(nr > 0))
		return -EINVAL;
	return dev->irq;
}
static inline const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev,
		int vec)
{
	return cpu_possible_mask;
}

static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
	return PCI_IRQ_INTX;
}
#endif

/**
 * pci_irqd_intx_xlate() - Translate PCI INTx value to an IRQ domain hwirq
 * @d: the INTx IRQ domain
 * @node: the DT node for the device whose interrupt we're translating
 * @intspec: the interrupt specifier data from the DT
 * @intsize: the number of entries in @intspec
 * @out_hwirq: pointer at which to write the hwirq number
 * @out_type: pointer at which to write the interrupt type
 *
 * Translate a PCI INTx interrupt number from device tree in the range 1-4, as
 * stored in the standard PCI_INTERRUPT_PIN register, to a value in the range
 * 0-3 suitable for use in a 4 entry IRQ domain. That is, subtract one from the
 * INTx value to obtain the hwirq number.
 *
 * Returns 0 on success, or -EINVAL if the interrupt specifier is out of range.
 */
static inline int pci_irqd_intx_xlate(struct irq_domain *d,
				      struct device_node *node,
				      const u32 *intspec,
				      unsigned int intsize,
				      unsigned long *out_hwirq,
				      unsigned int *out_type)
{
	const u32 intx = intspec[0];

	if (intx < PCI_INTERRUPT_INTA || intx > PCI_INTERRUPT_INTD)
		return -EINVAL;

	*out_hwirq = intx - PCI_INTERRUPT_INTA;
	return 0;
}

#ifdef CONFIG_PCIEPORTBUS
extern bool pcie_ports_disabled;
extern bool pcie_ports_native;

int pcie_set_target_speed(struct pci_dev *port, enum pci_bus_speed speed_req,
			  bool use_lt);
#else
#define pcie_ports_disabled	true
#define pcie_ports_native	false

static inline int pcie_set_target_speed(struct pci_dev *port,
					enum pci_bus_speed speed_req,
					bool use_lt)
{
	return -EOPNOTSUPP;
}
#endif

#define PCIE_LINK_STATE_L0S		(BIT(0) | BIT(1)) /* Upstr/dwnstr L0s */
#define PCIE_LINK_STATE_L1		BIT(2)	/* L1 state */
#define PCIE_LINK_STATE_L1_1		BIT(3)	/* ASPM L1.1 state */
#define PCIE_LINK_STATE_L1_2		BIT(4)	/* ASPM L1.2 state */
#define PCIE_LINK_STATE_L1_1_PCIPM	BIT(5)	/* PCI-PM L1.1 state */
#define PCIE_LINK_STATE_L1_2_PCIPM	BIT(6)	/* PCI-PM L1.2 state */
#define PCIE_LINK_STATE_ASPM_ALL	(PCIE_LINK_STATE_L0S		|\
					 PCIE_LINK_STATE_L1		|\
					 PCIE_LINK_STATE_L1_1		|\
					 PCIE_LINK_STATE_L1_2		|\
					 PCIE_LINK_STATE_L1_1_PCIPM	|\
					 PCIE_LINK_STATE_L1_2_PCIPM)
#define PCIE_LINK_STATE_CLKPM		BIT(7)
#define PCIE_LINK_STATE_ALL		(PCIE_LINK_STATE_ASPM_ALL	|\
					 PCIE_LINK_STATE_CLKPM)

#ifdef CONFIG_PCIEASPM
int pci_disable_link_state(struct pci_dev *pdev, int state);
int pci_disable_link_state_locked(struct pci_dev *pdev, int state);
int pci_enable_link_state(struct pci_dev *pdev, int state);
int pci_enable_link_state_locked(struct pci_dev *pdev, int state);
void pcie_no_aspm(void);
bool pcie_aspm_support_enabled(void);
bool pcie_aspm_enabled(struct pci_dev *pdev);
#else
static inline int pci_disable_link_state(struct pci_dev *pdev, int state)
{ return 0; }
static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state)
{ return 0; }
static inline int pci_enable_link_state(struct pci_dev *pdev, int state)
{ return 0; }
static inline int pci_enable_link_state_locked(struct pci_dev *pdev, int state)
{ return 0; }
static inline void pcie_no_aspm(void) { }
static inline bool pcie_aspm_support_enabled(void) { return false; }
static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; }
#endif

#ifdef CONFIG_HOTPLUG_PCI
void pci_hp_ignore_link_change(struct pci_dev *pdev);
void pci_hp_unignore_link_change(struct pci_dev *pdev);
#else
static inline void pci_hp_ignore_link_change(struct pci_dev *pdev) { }
static inline void pci_hp_unignore_link_change(struct pci_dev *pdev) { }
#endif

#ifdef CONFIG_PCIEAER
bool pci_aer_available(void);
#else
static inline bool pci_aer_available(void) { return false; }
#endif

bool pci_ats_disabled(void);

#define PCIE_PTM_CONTEXT_UPDATE_AUTO 0
#define PCIE_PTM_CONTEXT_UPDATE_MANUAL 1

struct pcie_ptm_ops {
	int (*check_capability)(void *drvdata);
	int (*context_update_write)(void *drvdata, u8 mode);
	int (*context_update_read)(void *drvdata, u8 *mode);
	int (*context_valid_write)(void *drvdata, bool valid);
	int (*context_valid_read)(void *drvdata, bool *valid);
	int (*local_clock_read)(void *drvdata, u64 *clock);
	int (*master_clock_read)(void *drvdata, u64 *clock);
	int (*t1_read)(void *drvdata, u64 *clock);
	int (*t2_read)(void *drvdata, u64 *clock);
	int (*t3_read)(void *drvdata, u64 *clock);
	int (*t4_read)(void *drvdata, u64 *clock);

	bool (*context_update_visible)(void *drvdata);
	bool (*context_valid_visible)(void *drvdata);
	bool (*local_clock_visible)(void *drvdata);
	bool (*master_clock_visible)(void *drvdata);
	bool (*t1_visible)(void *drvdata);
	bool (*t2_visible)(void *drvdata);
	bool (*t3_visible)(void *drvdata);
	bool (*t4_visible)(void *drvdata);
};

struct pci_ptm_debugfs {
	struct dentry *debugfs;
	const struct pcie_ptm_ops *ops;
	struct mutex lock;
	void *pdata;
};

#ifdef CONFIG_PCIE_PTM
int pci_enable_ptm(struct pci_dev *dev);
void pci_disable_ptm(struct pci_dev *dev);
bool pcie_ptm_enabled(struct pci_dev *dev);
#else
static inline int pci_enable_ptm(struct pci_dev *dev)
{ return -EINVAL; }
static inline void pci_disable_ptm(struct pci_dev *dev) { }
static inline bool pcie_ptm_enabled(struct pci_dev *dev)
{ return false; }
#endif

#if IS_ENABLED(CONFIG_DEBUG_FS) && IS_ENABLED(CONFIG_PCIE_PTM)
struct pci_ptm_debugfs *pcie_ptm_create_debugfs(struct device *dev, void *pdata,
						const struct pcie_ptm_ops *ops);
void pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs);
#else
static inline struct pci_ptm_debugfs
*pcie_ptm_create_debugfs(struct device *dev, void *pdata,
			 const struct pcie_ptm_ops *ops) { return NULL; }
static inline void
pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs) { }
#endif

void pci_cfg_access_lock(struct pci_dev *dev);
bool pci_cfg_access_trylock(struct pci_dev *dev);
void pci_cfg_access_unlock(struct pci_dev *dev);

void pci_dev_lock(struct pci_dev *dev);
int pci_dev_trylock(struct pci_dev *dev);
void pci_dev_unlock(struct pci_dev *dev);
DEFINE_GUARD(pci_dev, struct pci_dev *, pci_dev_lock(_T), pci_dev_unlock(_T))

/*
 * PCI domain support.  Sometimes called PCI segment (eg by ACPI),
 * a PCI domain is defined to be a set of PCI buses which share
 * configuration space.
 */
#ifdef CONFIG_PCI_DOMAINS
extern int pci_domains_supported;
int pci_bus_find_emul_domain_nr(u32 hint, u32 min, u32 max);
void pci_bus_release_emul_domain_nr(int domain_nr);
#else
enum { pci_domains_supported = 0 };
static inline int pci_domain_nr(struct pci_bus *bus) { return 0; }
static inline int pci_proc_domain(struct pci_bus *bus) { return 0; }
static inline int pci_bus_find_emul_domain_nr(u32 hint, u32 min, u32 max)
{
	return 0;
}
static inline void pci_bus_release_emul_domain_nr(int domain_nr) { }
#endif /* CONFIG_PCI_DOMAINS */

/*
 * Generic implementation for PCI domain support. If your
 * architecture does not need custom management of PCI
 * domains then this implementation will be used
 */
#ifdef CONFIG_PCI_DOMAINS_GENERIC
static inline int pci_domain_nr(struct pci_bus *bus)
{
	return bus->domain_nr;
}
#ifdef CONFIG_ACPI
int acpi_pci_bus_find_domain_nr(struct pci_bus *bus);
#else
static inline int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
{ return 0; }
#endif
int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent);
void pci_bus_release_domain_nr(struct device *parent, int domain_nr);
#endif

/* Some architectures require additional setup to direct VGA traffic */
typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
				    unsigned int command_bits, u32 flags);
void pci_register_set_vga_state(arch_set_vga_state_t func);

static inline int
pci_request_io_regions(struct pci_dev *pdev, const char *name)
{
	return pci_request_selected_regions(pdev,
			    pci_select_bars(pdev, IORESOURCE_IO), name);
}

static inline void
pci_release_io_regions(struct pci_dev *pdev)
{
	return pci_release_selected_regions(pdev,
			    pci_select_bars(pdev, IORESOURCE_IO));
}

static inline int
pci_request_mem_regions(struct pci_dev *pdev, const char *name)
{
	return pci_request_selected_regions(pdev,
			    pci_select_bars(pdev, IORESOURCE_MEM), name);
}

static inline void
pci_release_mem_regions(struct pci_dev *pdev)
{
	return pci_release_selected_regions(pdev,
			    pci_select_bars(pdev, IORESOURCE_MEM));
}

bool pci_suspend_retains_context(struct pci_dev *pdev);

#else /* CONFIG_PCI is not enabled */

static inline void pci_set_flags(int flags) { }
static inline void pci_add_flags(int flags) { }
static inline void pci_clear_flags(int flags) { }
static inline int pci_has_flag(int flag) { return 0; }

/*
 * If the system does not have PCI, clearly these return errors.  Define
 * these as simple inline functions to avoid hair in drivers.
 */
#define _PCI_NOP(o, s, t) \
	static inline int pci_##o##_config_##s(struct pci_dev *dev, \
						int where, t val) \
		{ return PCIBIOS_FUNC_NOT_SUPPORTED; }

#define _PCI_NOP_ALL(o, x)	_PCI_NOP(o, byte, u8 x) \
				_PCI_NOP(o, word, u16 x) \
				_PCI_NOP(o, dword, u32 x)
_PCI_NOP_ALL(read, *)
_PCI_NOP_ALL(write,)

static inline void pci_probe_flush_workqueue(void) { }

static inline struct pci_dev *pci_get_device(unsigned int vendor,
					     unsigned int device,
					     struct pci_dev *from)
{ return NULL; }

static inline struct pci_dev *pci_get_device_reverse(unsigned int vendor,
						     unsigned int device,
						     struct pci_dev *from)
{ return NULL; }

static inline struct pci_dev *pci_get_subsys(unsigned int vendor,
					     unsigned int device,
					     unsigned int ss_vendor,
					     unsigned int ss_device,
					     struct pci_dev *from)
{ return NULL; }

static inline struct pci_dev *pci_get_class(unsigned int class,
					    struct pci_dev *from)
{ return NULL; }

static inline struct pci_dev *pci_get_base_class(unsigned int class,
						 struct pci_dev *from)
{ return NULL; }

static inline int pci_dev_present(const struct pci_device_id *ids)
{ return 0; }

#define pci_dev_put(dev)	do { } while (0)

static inline void pci_set_master(struct pci_dev *dev) { }
static inline void pci_clear_master(struct pci_dev *dev) { }
static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
static inline void pci_disable_device(struct pci_dev *dev) { }
static inline int pcim_enable_device(struct pci_dev *pdev) { return -EIO; }
static inline int pci_assign_resource(struct pci_dev *dev, int i)
{ return -EBUSY; }
static inline int __must_check __pci_register_driver(struct pci_driver *drv,
						     struct module *owner,
						     const char *mod_name)
{ return 0; }
static inline int pci_register_driver(struct pci_driver *drv)
{ return 0; }
static inline void pci_unregister_driver(struct pci_driver *drv) { }
static inline u8 pci_find_capability(struct pci_dev *dev, int cap)
{ return 0; }
static inline u8 pci_find_next_capability(struct pci_dev *dev, u8 post, int cap)
{ return 0; }
static inline u16 pci_find_ext_capability(struct pci_dev *dev, int cap)
{ return 0; }

static inline u64 pci_get_dsn(struct pci_dev *dev)
{ return 0; }

/* Power management related routines */
static inline int pci_save_state(struct pci_dev *dev) { return 0; }
static inline void pci_restore_state(struct pci_dev *dev) { }
static inline int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{ return 0; }
static inline int pci_set_power_state_locked(struct pci_dev *dev, pci_power_t state)
{ return 0; }
static inline int pci_wake_from_d3(struct pci_dev *dev, bool enable)
{ return 0; }
static inline pci_power_t pci_choose_state(struct pci_dev *dev,
					   pm_message_t state)
{ return PCI_D0; }
static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,
				  int enable)
{ return 0; }

static inline struct resource *pci_find_resource(struct pci_dev *dev,
						 struct resource *res)
{ return NULL; }
static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
{ return -EIO; }
static inline void pci_release_regions(struct pci_dev *dev) { }

static inline int pci_register_io_range(const struct fwnode_handle *fwnode,
					phys_addr_t addr, resource_size_t size)
{ return -EINVAL; }

static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }

static inline struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
{ return NULL; }
static inline struct pci_dev *pci_get_slot(struct pci_bus *bus,
						unsigned int devfn)
{ return NULL; }
static inline struct pci_dev *pci_get_domain_bus_and_slot(int domain,
					unsigned int bus, unsigned int devfn)
{ return NULL; }

static inline int pci_domain_nr(struct pci_bus *bus) { return 0; }
static inline struct pci_dev *pci_dev_get(struct pci_dev *dev) { return NULL; }

#define dev_is_pci(d) (false)
#define dev_is_pf(d) (false)
static inline bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags)
{ return false; }
static inline int pci_irqd_intx_xlate(struct irq_domain *d,
				      struct device_node *node,
				      const u32 *intspec,
				      unsigned int intsize,
				      unsigned long *out_hwirq,
				      unsigned int *out_type)
{ return -EINVAL; }

static inline const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
							 struct pci_dev *dev)
{ return NULL; }
static inline bool pci_ats_disabled(void) { return true; }

static inline int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
{
	return -EINVAL;
}

static inline int
pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
			       unsigned int max_vecs, unsigned int flags,
			       struct irq_affinity *aff_desc)
{
	return -ENOSPC;
}
static inline int
pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
		      unsigned int max_vecs, unsigned int flags)
{
	return -ENOSPC;
}

static inline void pci_free_irq_vectors(struct pci_dev *dev)
{
}

static inline bool pci_suspend_retains_context(struct pci_dev *pdev)
{
	return true;
}

static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
	return 0;
}
#endif /* CONFIG_PCI */

/* Include architecture-dependent settings and functions */

#include <asm/pci.h>

/*
 * pci_mmap_resource_range() maps a specific BAR, and vm->vm_pgoff
 * is expected to be an offset within that region.
 *
 */
int pci_mmap_resource_range(struct pci_dev *dev, int bar,
			    struct vm_area_struct *vma,
			    enum pci_mmap_state mmap_state, int write_combine);

#ifndef arch_can_pci_mmap_wc
#define arch_can_pci_mmap_wc()		0
#endif

#ifndef arch_can_pci_mmap_io
#define arch_can_pci_mmap_io()		0
#define pci_iobar_pfn(pdev, bar, vma) (-EINVAL)
#else
int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma);
#endif

#ifndef pci_root_bus_fwnode
#define pci_root_bus_fwnode(bus)	NULL
#endif

/*
 * These helpers provide future and backwards compatibility
 * for accessing popular PCI BAR info
 */
#define pci_resource_n(dev, bar)	(&(dev)->resource[(bar)])
#define pci_resource_start(dev, bar)	(pci_resource_n(dev, bar)->start)
#define pci_resource_end(dev, bar)	(pci_resource_n(dev, bar)->end)
#define pci_resource_flags(dev, bar)	(pci_resource_n(dev, bar)->flags)
#define pci_resource_len(dev,bar)					\
	(pci_resource_end((dev), (bar)) ? 				\
	 resource_size(pci_resource_n((dev), (bar))) : 0)

#define __pci_dev_for_each_res0(dev, res, ...)				  \
	for (unsigned int __b = 0;					  \
	     __b < PCI_NUM_RESOURCES && (res = pci_resource_n(dev, __b)); \
	     __b++)

#define __pci_dev_for_each_res1(dev, res, __b)				  \
	for (__b = 0;							  \
	     __b < PCI_NUM_RESOURCES && (res = pci_resource_n(dev, __b)); \
	     __b++)

#define pci_dev_for_each_resource(dev, res, ...)			\
	CONCATENATE(__pci_dev_for_each_res, COUNT_ARGS(__VA_ARGS__)) 	\
		    (dev, res, __VA_ARGS__)

/**
 * pci_resource_is_io - check if a PCI resource is of I/O port type.
 * @dev: PCI device to check.
 * @resno: The resource number (BAR index) to check.
 *
 * Returns true if the resource type is I/O port.
 */
static inline bool pci_resource_is_io(const struct pci_dev *dev, int resno)
{
	return resource_type(pci_resource_n(dev, resno)) == IORESOURCE_IO;
}

/**
 * pci_resource_is_mem - check if a PCI resource is of memory type.
 * @dev: PCI device to check.
 * @resno: The resource number (BAR index) to check.
 *
 * Returns true if the resource type is memory, including
 * prefetchable memory.
 */
static inline bool pci_resource_is_mem(const struct pci_dev *dev, int resno)
{
	return resource_type(pci_resource_n(dev, resno)) == IORESOURCE_MEM;
}

/*
 * Similar to the helpers above, these manipulate per-pci_dev
 * driver-specific data.  They are really just a wrapper around
 * the generic device structure functions of these calls.
 */
static inline void *pci_get_drvdata(struct pci_dev *pdev)
{
	return dev_get_drvdata(&pdev->dev);
}

static inline void pci_set_drvdata(struct pci_dev *pdev, void *data)
{
	dev_set_drvdata(&pdev->dev, data);
}

static inline const char *pci_name(const struct pci_dev *pdev)
{
	return dev_name(&pdev->dev);
}

void pci_resource_to_user(const struct pci_dev *dev, int bar,
			  const struct resource *rsrc,
			  resource_size_t *start, resource_size_t *end);

/*
 * The world is not perfect and supplies us with broken PCI devices.
 * For at least a part of these bugs we need a work-around, so both
 * generic (drivers/pci/quirks.c) and per-architecture code can define
 * fixup hooks to be called for particular buggy devices.
 */

struct pci_fixup {
	u16 vendor;			/* Or PCI_ANY_ID */
	u16 device;			/* Or PCI_ANY_ID */
	u32 class;			/* Or PCI_ANY_ID */
	unsigned int class_shift;	/* should be 0, 8, 16 */
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
	int hook_offset;
#else
	void (*hook)(struct pci_dev *dev);
#endif
};

enum pci_fixup_pass {
	pci_fixup_early,	/* Before probing BARs */
	pci_fixup_header,	/* After reading configuration header */
	pci_fixup_final,	/* Final phase of device fixups */
	pci_fixup_enable,	/* pci_enable_device() time */
	pci_fixup_resume,	/* pci_device_resume() */
	pci_fixup_suspend,	/* pci_device_suspend() */
	pci_fixup_resume_early, /* pci_device_resume_early() */
	pci_fixup_suspend_late,	/* pci_device_suspend_late() */
};

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#define ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				    class_shift, hook)			\
	__ADDRESSABLE(hook)						\
	asm(".section "	#sec ", \"a\"				\n"	\
	    ".balign	16					\n"	\
	    ".short "	#vendor ", " #device "			\n"	\
	    ".long "	#class ", " #class_shift "		\n"	\
	    ".long "	#hook " - .				\n"	\
	    ".previous						\n");

/*
 * Clang's LTO may rename static functions in C, but has no way to
 * handle such renamings when referenced from inline asm. To work
 * around this, create global C stubs for these cases.
 */
#ifdef CONFIG_LTO_CLANG
#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, hook, stub)		\
	void stub(struct pci_dev *dev);					\
	void stub(struct pci_dev *dev)					\
	{ 								\
		hook(dev); 						\
	}								\
	___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, stub)
#else
#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, hook, stub)		\
	___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, hook)
#endif

#define DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, hook)			\
	__DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class,	\
				  class_shift, hook, __UNIQUE_ID(hook))
#else
/* Anonymous variables would be nice... */
#define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class,	\
				  class_shift, hook)			\
	static const struct pci_fixup __PASTE(__pci_fixup_##name,__LINE__) __used	\
	__attribute__((__section__(#section), aligned((sizeof(void *)))))    \
		= { vendor, device, class, class_shift, hook };
#endif

#define DECLARE_PCI_FIXUP_CLASS_EARLY(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_HEADER(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_FINAL(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_ENABLE(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
		hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_RESUME(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume,			\
		resume##hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(vendor, device, class,	\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early,		\
		resume_early##hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_SUSPEND(vendor, device, class,		\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend,			\
		suspend##hook, vendor, device, class, class_shift, hook)
#define DECLARE_PCI_FIXUP_CLASS_SUSPEND_LATE(vendor, device, class,	\
					 class_shift, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend_late,		\
		suspend_late##hook, vendor, device, class, class_shift, hook)

#define DECLARE_PCI_FIXUP_EARLY(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_early,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_HEADER(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_header,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_FINAL(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_final,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_ENABLE(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_enable,			\
		hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_RESUME(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume,			\
		resume##hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_RESUME_EARLY(vendor, device, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_resume_early,		\
		resume_early##hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_SUSPEND(vendor, device, hook)			\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend,			\
		suspend##hook, vendor, device, PCI_ANY_ID, 0, hook)
#define DECLARE_PCI_FIXUP_SUSPEND_LATE(vendor, device, hook)		\
	DECLARE_PCI_FIXUP_SECTION(.pci_fixup_suspend_late,		\
		suspend_late##hook, vendor, device, PCI_ANY_ID, 0, hook)

#ifdef CONFIG_PCI_QUIRKS
void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev);
#else
static inline void pci_fixup_device(enum pci_fixup_pass pass,
				    struct pci_dev *dev) { }
#endif

int pcim_intx(struct pci_dev *pdev, int enabled);
int pcim_request_all_regions(struct pci_dev *pdev, const char *name);
void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
				const char *name);
void pcim_iounmap_region(struct pci_dev *pdev, int bar);
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
int pcim_request_region(struct pci_dev *pdev, int bar, const char *name);
int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
				unsigned long offset, unsigned long len);

extern int pci_pci_problems;
#define PCIPCI_FAIL		1	/* No PCI PCI DMA */
#define PCIPCI_TRITON		2
#define PCIPCI_NATOMA		4
#define PCIPCI_VIAETBF		8
#define PCIPCI_VSFX		16
#define PCIPCI_ALIMAGIK		32	/* Need low latency setting */
#define PCIAGP_FAIL		64	/* No PCI to AGP DMA */

extern u8 pci_dfl_cache_line_size;
extern u8 pci_cache_line_size;

/* Architecture-specific versions may override these (weak) */
void pcibios_disable_device(struct pci_dev *dev);
void pcibios_set_master(struct pci_dev *dev);
int pcibios_set_pcie_reset_state(struct pci_dev *dev,
				 enum pcie_reset_state state);
int pcibios_device_add(struct pci_dev *dev);
void pcibios_release_device(struct pci_dev *dev);
#ifdef CONFIG_PCI
void pcibios_penalize_isa_irq(int irq, int active);
#else
static inline void pcibios_penalize_isa_irq(int irq, int active) {}
#endif
int pcibios_alloc_irq(struct pci_dev *dev);
void pcibios_free_irq(struct pci_dev *dev);
resource_size_t pcibios_default_alignment(void);

#if defined(CONFIG_PCI_MMCONFIG) || defined(CONFIG_ACPI_MCFG)
void __init pci_mmcfg_early_init(void);
void __init pci_mmcfg_late_init(void);
#else
static inline void pci_mmcfg_early_init(void) { }
static inline void pci_mmcfg_late_init(void) { }
#endif

int pci_ext_cfg_avail(void);

void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar);

#ifdef CONFIG_PCI_IOV
int pci_iov_virtfn_bus(struct pci_dev *dev, int id);
int pci_iov_virtfn_devfn(struct pci_dev *dev, int id);
int pci_iov_vf_id(struct pci_dev *dev);
void *pci_iov_get_pf_drvdata(struct pci_dev *dev, struct pci_driver *pf_driver);
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
void pci_disable_sriov(struct pci_dev *dev);

int pci_iov_sysfs_link(struct pci_dev *dev, struct pci_dev *virtfn, int id);
int pci_iov_add_virtfn(struct pci_dev *dev, int id);
void pci_iov_remove_virtfn(struct pci_dev *dev, int id);
int pci_num_vf(struct pci_dev *dev);
int pci_vfs_assigned(struct pci_dev *dev);
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
unsigned int pci_sriov_get_totalvfs(struct pci_dev *dev);
int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn);
resource_size_t pci_iov_resource_size(const struct pci_dev *dev, int resno);
int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size);
u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs);
void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe);

/* Arch may override these (weak) */
int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs);
int pcibios_sriov_disable(struct pci_dev *pdev);
resource_size_t pcibios_iov_resource_alignment(const struct pci_dev *dev,
					       int resno);
#else
static inline int pci_iov_virtfn_bus(struct pci_dev *dev, int id)
{
	return -ENOSYS;
}
static inline int pci_iov_virtfn_devfn(struct pci_dev *dev, int id)
{
	return -ENOSYS;
}

static inline int pci_iov_vf_id(struct pci_dev *dev)
{
	return -ENOSYS;
}

static inline void *pci_iov_get_pf_drvdata(struct pci_dev *dev,
					   struct pci_driver *pf_driver)
{
	return ERR_PTR(-EINVAL);
}

static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
{ return -ENODEV; }

static inline int pci_iov_sysfs_link(struct pci_dev *dev,
				     struct pci_dev *virtfn, int id)
{
	return -ENODEV;
}
static inline int pci_iov_add_virtfn(struct pci_dev *dev, int id)
{
	return -ENOSYS;
}
static inline void pci_iov_remove_virtfn(struct pci_dev *dev,
					 int id) { }
static inline void pci_disable_sriov(struct pci_dev *dev) { }
static inline int pci_num_vf(struct pci_dev *dev) { return 0; }
static inline int pci_vfs_assigned(struct pci_dev *dev)
{ return 0; }
static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
{ return 0; }
static inline unsigned int pci_sriov_get_totalvfs(struct pci_dev *dev)
{ return 0; }
#define pci_sriov_configure_simple	NULL
static inline resource_size_t pci_iov_resource_size(const struct pci_dev *dev,
						    int resno)
{ return 0; }
static inline int pci_iov_vf_bar_set_size(struct pci_dev *dev, int resno, int size)
{ return -ENODEV; }
static inline u32 pci_iov_vf_bar_get_sizes(struct pci_dev *dev, int resno, int num_vfs)
{ return 0; }
static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { }
#endif

/**
 * pci_pcie_cap - get the saved PCIe capability offset
 * @dev: PCI device
 *
 * PCIe capability offset is calculated at PCI device initialization
 * time and saved in the data structure. This function returns saved
 * PCIe capability offset. Using this instead of pci_find_capability()
 * reduces unnecessary search in the PCI configuration space. If you
 * need to calculate PCIe capability offset from raw device for some
 * reasons, please use pci_find_capability() instead.
 */
static inline int pci_pcie_cap(struct pci_dev *dev)
{
	return dev->pcie_cap;
}

/**
 * pci_is_pcie - check if the PCI device is PCI Express capable
 * @dev: PCI device
 *
 * Returns: true if the PCI device is PCI Express capable, false otherwise.
 */
static inline bool pci_is_pcie(struct pci_dev *dev)
{
	return pci_pcie_cap(dev);
}

/**
 * pcie_caps_reg - get the PCIe Capabilities Register
 * @dev: PCI device
 */
static inline u16 pcie_caps_reg(const struct pci_dev *dev)
{
	return dev->pcie_flags_reg;
}

/**
 * pci_pcie_type - get the PCIe device/port type
 * @dev: PCI device
 */
static inline int pci_pcie_type(const struct pci_dev *dev)
{
	return (pcie_caps_reg(dev) & PCI_EXP_FLAGS_TYPE) >> 4;
}

/**
 * pcie_find_root_port - Get the PCIe root port device
 * @dev: PCI device
 *
 * Traverse up the parent chain and return the PCIe Root Port PCI Device
 * for a given PCI/PCIe Device.
 */
static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
{
	while (dev) {
		if (pci_is_pcie(dev) &&
		    pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
			return dev;
		dev = pci_upstream_bridge(dev);
	}

	return NULL;
}

static inline bool pci_dev_is_disconnected(const struct pci_dev *dev)
{
	/*
	 * error_state is set in pci_dev_set_io_state() using xchg/cmpxchg()
	 * and read w/o common lock. READ_ONCE() ensures compiler cannot cache
	 * the value (e.g. inside the loop in pci_dev_wait()).
	 */
	return READ_ONCE(dev->error_state) == pci_channel_io_perm_failure;
}

void pci_request_acs(void);
bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
bool pci_acs_path_enabled(struct pci_dev *start,
			  struct pci_dev *end, u16 acs_flags);
int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask);

#define PCI_VPD_LRDT			0x80	/* Large Resource Data Type */
#define PCI_VPD_LRDT_ID(x)		((x) | PCI_VPD_LRDT)

/* Large Resource Data Type Tag Item Names */
#define PCI_VPD_LTIN_ID_STRING		0x02	/* Identifier String */
#define PCI_VPD_LTIN_RO_DATA		0x10	/* Read-Only Data */
#define PCI_VPD_LTIN_RW_DATA		0x11	/* Read-Write Data */

#define PCI_VPD_LRDT_ID_STRING		PCI_VPD_LRDT_ID(PCI_VPD_LTIN_ID_STRING)
#define PCI_VPD_LRDT_RO_DATA		PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RO_DATA)
#define PCI_VPD_LRDT_RW_DATA		PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RW_DATA)

#define PCI_VPD_RO_KEYWORD_PARTNO	"PN"
#define PCI_VPD_RO_KEYWORD_SERIALNO	"SN"
#define PCI_VPD_RO_KEYWORD_MFR_ID	"MN"
#define PCI_VPD_RO_KEYWORD_VENDOR0	"V0"
#define PCI_VPD_RO_KEYWORD_CHKSUM	"RV"

/**
 * pci_vpd_alloc - Allocate buffer and read VPD into it
 * @dev: PCI device
 * @size: pointer to field where VPD length is returned
 *
 * Returns pointer to allocated buffer or an ERR_PTR in case of failure
 */
void *pci_vpd_alloc(struct pci_dev *dev, unsigned int *size);

/**
 * pci_vpd_find_id_string - Locate id string in VPD
 * @buf: Pointer to buffered VPD data
 * @len: The length of the buffer area in which to search
 * @size: Pointer to field where length of id string is returned
 *
 * Returns the index of the id string or -ENOENT if not found.
 */
int pci_vpd_find_id_string(const u8 *buf, unsigned int len, unsigned int *size);

/**
 * pci_vpd_find_ro_info_keyword - Locate info field keyword in VPD RO section
 * @buf: Pointer to buffered VPD data
 * @len: The length of the buffer area in which to search
 * @kw: The keyword to search for
 * @size: Pointer to field where length of found keyword data is returned
 *
 * Returns the index of the information field keyword data or -ENOENT if
 * not found.
 */
int pci_vpd_find_ro_info_keyword(const void *buf, unsigned int len,
				 const char *kw, unsigned int *size);

/**
 * pci_vpd_check_csum - Check VPD checksum
 * @buf: Pointer to buffered VPD data
 * @len: VPD size
 *
 * Returns 1 if VPD has no checksum, otherwise 0 or an errno
 */
int pci_vpd_check_csum(const void *buf, unsigned int len);

/* PCI <-> OF binding helpers */
#ifdef CONFIG_OF
struct device_node;
struct irq_domain;
struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus);
bool pci_host_of_has_msi_map(struct device *dev);

/* Arch may override this (weak) */
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus);

#else	/* CONFIG_OF */
static inline struct irq_domain *
pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; }
static inline bool pci_host_of_has_msi_map(struct device *dev) { return false; }
#endif  /* CONFIG_OF */

static inline struct device_node *
pci_device_to_OF_node(const struct pci_dev *pdev)
{
	return pdev ? pdev->dev.of_node : NULL;
}

static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
{
	return bus ? bus->dev.of_node : NULL;
}

#ifdef CONFIG_ACPI
struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);

void
pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *));
bool pci_pr3_present(struct pci_dev *pdev);
#else
static inline struct irq_domain *
pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }
static inline bool pci_pr3_present(struct pci_dev *pdev) { return false; }
#endif

#if defined(CONFIG_X86) && defined(CONFIG_ACPI)
bool arch_pci_dev_is_removable(struct pci_dev *pdev);
#else
static inline bool arch_pci_dev_is_removable(struct pci_dev *pdev) { return false; }
#endif

#ifdef CONFIG_EEH
static inline struct eeh_dev *pci_dev_to_eeh_dev(struct pci_dev *pdev)
{
	return pdev->dev.archdata.edev;
}
#endif

void pci_add_dma_alias(struct pci_dev *dev, u8 devfn_from, unsigned nr_devfns);
bool pci_devs_are_dma_aliases(struct pci_dev *dev1, struct pci_dev *dev2);
int pci_for_each_dma_alias(struct pci_dev *pdev,
			   int (*fn)(struct pci_dev *pdev,
				     u16 alias, void *data), void *data);

/* Helper functions for operation of device flag */
static inline void pci_set_dev_assigned(struct pci_dev *pdev)
{
	pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
}
static inline void pci_clear_dev_assigned(struct pci_dev *pdev)
{
	pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
}
static inline bool pci_is_dev_assigned(struct pci_dev *pdev)
{
	return (pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED) == PCI_DEV_FLAGS_ASSIGNED;
}

/**
 * pci_ari_enabled - query ARI forwarding status
 * @bus: the PCI bus
 *
 * Returns true if ARI forwarding is enabled.
 */
static inline bool pci_ari_enabled(struct pci_bus *bus)
{
	return bus->self && bus->self->ari_enabled;
}

/**
 * pci_is_thunderbolt_attached - whether device is on a Thunderbolt daisy chain
 * @pdev: PCI device to check
 *
 * Walk upwards from @pdev and check for each encountered bridge if it's part
 * of a Thunderbolt controller.  Reaching the host bridge means @pdev is not
 * Thunderbolt-attached.  (But rather soldered to the mainboard usually.)
 */
static inline bool pci_is_thunderbolt_attached(struct pci_dev *pdev)
{
	struct pci_dev *parent = pdev;

	if (pdev->is_thunderbolt)
		return true;

	while ((parent = pci_upstream_bridge(parent)))
		if (parent->is_thunderbolt)
			return true;

	return false;
}

#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH) || defined(CONFIG_S390)
void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
#endif

#include <linux/dma-mapping.h>

#define pci_emerg(pdev, fmt, arg...)	dev_emerg(&(pdev)->dev, fmt, ##arg)
#define pci_alert(pdev, fmt, arg...)	dev_alert(&(pdev)->dev, fmt, ##arg)
#define pci_crit(pdev, fmt, arg...)	dev_crit(&(pdev)->dev, fmt, ##arg)
#define pci_err(pdev, fmt, arg...)	dev_err(&(pdev)->dev, fmt, ##arg)
#define pci_warn(pdev, fmt, arg...)	dev_warn(&(pdev)->dev, fmt, ##arg)
#define pci_warn_once(pdev, fmt, arg...) dev_warn_once(&(pdev)->dev, fmt, ##arg)
#define pci_notice(pdev, fmt, arg...)	dev_notice(&(pdev)->dev, fmt, ##arg)
#define pci_info(pdev, fmt, arg...)	dev_info(&(pdev)->dev, fmt, ##arg)
#define pci_dbg(pdev, fmt, arg...)	dev_dbg(&(pdev)->dev, fmt, ##arg)

#define pci_notice_ratelimited(pdev, fmt, arg...) \
	dev_notice_ratelimited(&(pdev)->dev, fmt, ##arg)

#define pci_info_ratelimited(pdev, fmt, arg...) \
	dev_info_ratelimited(&(pdev)->dev, fmt, ##arg)

#define pci_WARN(pdev, condition, fmt, arg...) \
	WARN(condition, "%s %s: " fmt, \
	     dev_driver_string(&(pdev)->dev), pci_name(pdev), ##arg)

#define pci_WARN_ONCE(pdev, condition, fmt, arg...) \
	WARN_ONCE(condition, "%s %s: " fmt, \
		  dev_driver_string(&(pdev)->dev), pci_name(pdev), ##arg)

#endif /* LINUX_PCI_H */