/* 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/mod_devicetable.h>

#include <linux/types.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 <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)

/*
 * 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 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) */
        unsigned char           number;         /* PCI_SLOT(pci_dev->devfn) */
        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_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

/*
 * 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),
};

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_cap_saved_data {
        u16             cap_nr;
        bool            cap_extended;
        unsigned int    size;
        u32             data[];
};

struct pci_cap_saved_state {
        struct hlist_node               next;
        struct pci_cap_saved_data       cap;
};

struct irq_affinity;
struct pcie_link_state;
struct pci_vpd;
struct pci_sriov;
struct pci_p2pdma;
struct rcec_ea;

/* The pci_dev structure describes PCI devices */
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_stats *aer_stats;    /* AER stats for this device */
#endif
#ifdef CONFIG_PCIEPORTBUS
        struct rcec_ea  *rcec_ea;       /* RCEC cached endpoint association */
        struct pci_dev  *rcec;          /* Associated RCEC device */
#endif
        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.  */

        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. */
        unsigned int    imm_ready:1;    /* Supports Immediate Readiness */
        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    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    runtime_d3cold:1;       /* Whether go through runtime
                                                   D3cold, not set for devices
                                                   powered on/off by the
                                                   corresponding bridge */
        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    d3hot_delay;    /* D3hot->D0 transition time in ms */
        unsigned int    d3cold_delay;   /* D3cold->D0 transition time in ms */

#ifdef CONFIG_PCIEASPM
        struct pcie_link_state  *link_state;    /* ASPM link state */
        unsigned int    ltr_path:1;     /* Latency Tolerance Reporting
                                           supported from root to here */
        u16             l1ss;           /* L1SS Capability pointer */
#endif
        unsigned int    eetlp_prefix_path:1;    /* End-to-End TLP Prefix */

        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 */

        bool            match_driver;           /* Skip attaching driver */

        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    no_64bit_msi:1;         /* May only use 32-bit MSIs */
        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    is_managed:1;
        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    reset_fn:1;
        unsigned int    is_hotplug_bridge:1;
        unsigned int    shpc_managed:1;         /* SHPC owned by shpchp */
        unsigned int    is_thunderbolt:1;       /* Thunderbolt controller */
        /*
         * 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 */
        pci_dev_flags_t dev_flags;
        atomic_t        enable_cnt;     /* pci_enable_device has been called */

        u32             saved_config_space[16]; /* Config space saved at suspend time */
        struct hlist_head saved_cap_space;
        int             rom_attr_enabled;       /* Display of ROM attribute enabled? */
        struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
        struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */

#ifdef CONFIG_HOTPLUG_PCI_PCIE
        unsigned int    broken_cmd_compl:1;     /* No compl for some cmds */
#endif
#ifdef CONFIG_PCIE_PTM
        unsigned int    ptm_root:1;
        unsigned int    ptm_enabled:1;
        u8              ptm_granularity;
#endif
#ifdef CONFIG_PCI_MSI
        const struct attribute_group **msi_irq_groups;
#endif
        struct pci_vpd *vpd;
#ifdef CONFIG_PCIE_DPC
        u16             dpc_cap;
        unsigned int    dpc_rp_extensions:1;
        u8              dpc_rp_log_size;
#endif
#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
        u16             acs_cap;        /* ACS Capability offset */
        phys_addr_t     rom;            /* Physical address if not from BAR */
        size_t          romlen;         /* Length if not from BAR */
        char            *driver_override; /* Driver name to force a match */

        unsigned long   priv_flags;     /* Private flags for the PCI driver */
};

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)

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

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;
        struct list_head windows;       /* resource_entry */
        struct list_head dma_ranges;    /* dma ranges resource list */
        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 *);
        void            *release_data;
        unsigned int    ignore_reset_delay:1;   /* For entire hierarchy */
        unsigned int    no_ext_tags:1;          /* No Extended Tags */
        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    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 */

        /* 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 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);

/*
 * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
 * to P2P or CardBus bridge windows) go in a table.  Additional ones (for
 * buses below host bridges or subtractive decode bridges) go in the list.
 * Use pci_bus_for_each_resource() to iterate through all the resources.
 */

/*
 * PCI_SUBTRACTIVE_DECODE means the bridge forwards the window implicitly
 * and there's no way to program the bridge with the details of the window.
 * This does not apply to ACPI _CRS windows, even with the _DEC subtractive-
 * decode bit set, because they are explicit and can be programmed with _SRS.
 */
#define PCI_SUBTRACTIVE_DECODE  0x1

struct pci_bus_resource {
        struct list_head        list;
        struct resource         *res;
        unsigned int            flags;
};

#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;
        struct bin_attribute    *legacy_io;     /* Legacy I/O for this bus */
        struct bin_attribute    *legacy_mem;    /* Legacy mem */
        unsigned int            is_added:1;
};

#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;
}

#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;
};

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);
};


struct module;

/**
 * struct pci_driver - PCI driver structure
 * @node:       List of driver structures.
 * @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 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.
 */
struct pci_driver {
        struct list_head        node;
        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;
};

#define to_pci_driver(drv) container_of(drv, struct pci_driver, driver)

/**
 * 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_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_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_LEGACY          (1 << 0) /* Allow legacy 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

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 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 */
/* Some device drivers need know if PCI is initiated */
int no_pci_devices(void);

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 *, const struct resource *,
                                resource_size_t,
                                resource_size_t);

/* Weak but can be overridden by arch */
void pci_fixup_cardbus(struct pci_bus *);

/* 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);
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);
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);
void pci_setup_cardbus(struct pci_bus *bus);
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);

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_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);
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);

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(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);

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_io(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);
void pcie_print_link_status(struct pci_dev *dev);
bool pcie_has_flr(struct pci_dev *dev);
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 __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);
void pci_release_resource(struct pci_dev *dev, int resno);
static inline int pci_rebar_bytes_to_size(u64 bytes)
{
        bytes = roundup_pow_of_two(bytes);

        /* Return BAR size as defined in the resizable BAR specification */
        return max(ilog2(bytes), 20) - 20;
}

u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar);
int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size);
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);
struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap);
struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev,
                                                   u16 cap);
int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size);
int pci_add_ext_cap_save_buffer(struct pci_dev *dev,
                                u16 cap, unsigned int size);
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);
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_bridge_resize(struct pci_dev *bridge);
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);

/* 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_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type);
void pdev_enable_device(struct pci_dev *);
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);

/* 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,
                          unsigned int flags);
struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
void pci_bus_remove_resources(struct pci_bus *bus);
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_resource(bus, res, i)                          \
        for (i = 0;                                                     \
            (res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
             i++)

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_size_t (*alignf)(void *,
                                                  const struct resource *,
                                                  resource_size_t,
                                                  resource_size_t),
                        void *alignf_data);


int pci_register_io_range(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);
int pci_cfg_space_size(struct pci_dev *dev);
unsigned char pci_bus_max_busnr(struct pci_bus *bus);
void pci_setup_bridge(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_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX)

/* kmem_cache style wrapper around pci_alloc_consistent() */

#include <linux/dmapool.h>

#define pci_pool dma_pool
#define pci_pool_create(name, pdev, size, align, allocation) \
                dma_pool_create(name, &pdev->dev, size, align, allocation)
#define pci_pool_destroy(pool) dma_pool_destroy(pool)
#define pci_pool_alloc(pool, flags, handle) dma_pool_alloc(pool, flags, handle)
#define pci_pool_zalloc(pool, flags, handle) \
                dma_pool_zalloc(pool, flags, handle)
#define pci_pool_free(pool, vaddr, addr) dma_pool_free(pool, vaddr, addr)

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);
int 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_affinity(struct pci_dev *dev, unsigned int min_vecs,
                                   unsigned int max_vecs, unsigned int flags,
                                   struct irq_affinity *affd);

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);

#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 int pci_msi_enabled(void) { return 0; }
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_LEGACY) && min_vecs == 1 && dev->irq)
                return 1;
        return -ENOSPC;
}

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;
}
#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;
#else
#define pcie_ports_disabled     true
#define pcie_ports_native       false
#endif

#define PCIE_LINK_STATE_L0S             BIT(0)
#define PCIE_LINK_STATE_L1              BIT(1)
#define PCIE_LINK_STATE_CLKPM           BIT(2)
#define PCIE_LINK_STATE_L1_1            BIT(3)
#define PCIE_LINK_STATE_L1_2            BIT(4)
#define PCIE_LINK_STATE_L1_1_PCIPM      BIT(5)
#define PCIE_LINK_STATE_L1_2_PCIPM      BIT(6)

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

bool pci_ats_disabled(void);

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);

int pci_dev_trylock(struct pci_dev *dev);
void pci_dev_unlock(struct pci_dev *dev);

/*
 * 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;
#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; }
#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);
#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));
}

#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 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_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; }

#define pci_dev_present(ids)    (0)
#define no_pci_devices()        (1)
#define pci_dev_put(dev)        do { } while (0)

static inline void pci_set_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 __pci_register_driver(struct pci_driver *drv,
                                        struct module *owner)
{ 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 int pci_find_next_capability(struct pci_dev *dev, u8 post,
                                           int cap)
{ return 0; }
static inline int 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_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(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;
}
#endif /* CONFIG_PCI */

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);
}

/* Include architecture-dependent settings and functions */

#include <asm/pci.h>

/* These two functions provide almost identical functionality. Depending
 * on the architecture, one will be implemented as a wrapper around the
 * other (in drivers/pci/mmap.c).
 *
 * pci_mmap_resource_range() maps a specific BAR, and vm->vm_pgoff
 * is expected to be an offset within that region.
 *
 * pci_mmap_page_range() is the legacy architecture-specific interface,
 * which accepts a "user visible" resource address converted by
 * pci_resource_to_user(), as used in the legacy mmap() interface in
 * /proc/bus/pci/.
 */
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);
int pci_mmap_page_range(struct pci_dev *pdev, 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_start(dev, bar)    ((dev)->resource[(bar)].start)
#define pci_resource_end(dev, bar)      ((dev)->resource[(bar)].end)
#define pci_resource_flags(dev, bar)    ((dev)->resource[(bar)].flags)
#define pci_resource_len(dev,bar) \
        ((pci_resource_start((dev), (bar)) == 0 &&      \
          pci_resource_end((dev), (bar)) ==             \
          pci_resource_start((dev), (bar))) ? 0 :       \
                                                        \
         (pci_resource_end((dev), (bar)) -              \
          pci_resource_start((dev), (bar)) + 1))

/*
 * 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 __cficanonical stub(struct pci_dev *dev);                  \
        void __cficanonical 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

void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
                                   const char *name);
void pcim_iounmap_regions(struct pci_dev *pdev, int mask);

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 unsigned long pci_cardbus_io_size;
extern unsigned long pci_cardbus_mem_size;
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_add_device(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_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);
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(struct pci_dev *dev, int resno);
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(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_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 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(struct pci_dev *dev, int resno)
{ return 0; }
static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { }
#endif

#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
void pci_hp_create_module_link(struct pci_slot *pci_slot);
void pci_hp_remove_module_link(struct pci_slot *pci_slot);
#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;
}

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)

/* Small Resource Data Type Tag Item Names */
#define PCI_VPD_STIN_END                0x0f    /* End */

#define PCI_VPD_SRDT_END                (PCI_VPD_STIN_END << 3)

#define PCI_VPD_SRDT_TIN_MASK           0x78
#define PCI_VPD_SRDT_LEN_MASK           0x07
#define PCI_VPD_LRDT_TIN_MASK           0x7f

#define PCI_VPD_LRDT_TAG_SIZE           3
#define PCI_VPD_SRDT_TAG_SIZE           1

#define PCI_VPD_INFO_FLD_HDR_SIZE       3

#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_lrdt_size - Extracts the Large Resource Data Type length
 * @lrdt: Pointer to the beginning of the Large Resource Data Type tag
 *
 * Returns the extracted Large Resource Data Type length.
 */
static inline u16 pci_vpd_lrdt_size(const u8 *lrdt)
{
        return (u16)lrdt[1] + ((u16)lrdt[2] << 8);
}

/**
 * pci_vpd_lrdt_tag - Extracts the Large Resource Data Type Tag Item
 * @lrdt: Pointer to the beginning of the Large Resource Data Type tag
 *
 * Returns the extracted Large Resource Data Type Tag item.
 */
static inline u16 pci_vpd_lrdt_tag(const u8 *lrdt)
{
        return (u16)(lrdt[0] & PCI_VPD_LRDT_TIN_MASK);
}

/**
 * pci_vpd_srdt_size - Extracts the Small Resource Data Type length
 * @srdt: Pointer to the beginning of the Small Resource Data Type tag
 *
 * Returns the extracted Small Resource Data Type length.
 */
static inline u8 pci_vpd_srdt_size(const u8 *srdt)
{
        return (*srdt) & PCI_VPD_SRDT_LEN_MASK;
}

/**
 * pci_vpd_srdt_tag - Extracts the Small Resource Data Type Tag Item
 * @srdt: Pointer to the beginning of the Small Resource Data Type tag
 *
 * Returns the extracted Small Resource Data Type Tag Item.
 */
static inline u8 pci_vpd_srdt_tag(const u8 *srdt)
{
        return ((*srdt) & PCI_VPD_SRDT_TIN_MASK) >> 3;
}

/**
 * pci_vpd_info_field_size - Extracts the information field length
 * @info_field: Pointer to the beginning of an information field header
 *
 * Returns the extracted information field length.
 */
static inline u8 pci_vpd_info_field_size(const u8 *info_field)
{
        return info_field[2];
}

/**
 * pci_vpd_find_tag - Locates the Resource Data Type tag provided
 * @buf: Pointer to buffered vpd data
 * @len: The length of the vpd buffer
 * @rdt: The Resource Data Type to search for
 *
 * Returns the index where the Resource Data Type was found or
 * -ENOENT otherwise.
 */
int pci_vpd_find_tag(const u8 *buf, unsigned int len, u8 rdt);

/**
 * pci_vpd_find_info_keyword - Locates an information field keyword in the VPD
 * @buf: Pointer to buffered vpd data
 * @off: The offset into the buffer at which to begin the search
 * @len: The length of the buffer area, relative to off, in which to search
 * @kw: The keyword to search for
 *
 * Returns the index where the information field keyword was found or
 * -ENOENT otherwise.
 */
int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
                              unsigned int len, const char *kw);

/* 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

#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)
void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
#endif

/* Provide the legacy pci_dma_* API */
#include <linux/pci-dma-compat.h>

#define pci_printk(level, pdev, fmt, arg...) \
        dev_printk(level, &(pdev)->dev, fmt, ##arg)

#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_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 */