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lib/pci.h
334 строки
14 KB
Martin Mareš
Released as v3.15.0
05 апр 2026, 22:24
05 апр 2026, 22:24
b424ac8
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/* * The PCI Library * * Copyright (c) 1997--2025 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL v2+ * * SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _PCI_LIB_H #define _PCI_LIB_H #ifdef __cplusplus extern "C" { #endif #ifndef PCI_CONFIG_H #include "config.h" #endif #include "header.h" #include "types.h" #define PCI_LIB_VERSION 0x030f00 #ifndef PCI_ABI #define PCI_ABI #endif /* * PCI Access Structure */ struct pci_methods; enum pci_access_type { /* Known access methods, remember to update init.c as well */ PCI_ACCESS_AUTO, /* Autodetection */ PCI_ACCESS_SYS_BUS_PCI, /* Linux /sys/bus/pci */ PCI_ACCESS_PROC_BUS_PCI, /* Linux /proc/bus/pci */ PCI_ACCESS_I386_TYPE1, /* i386 ports, type 1 */ PCI_ACCESS_I386_TYPE2, /* i386 ports, type 2 */ PCI_ACCESS_FBSD_DEVICE, /* FreeBSD /dev/pci */ PCI_ACCESS_AIX_DEVICE, /* /dev/pci0, /dev/bus0, etc. */ PCI_ACCESS_NBSD_LIBPCI, /* NetBSD libpci */ PCI_ACCESS_OBSD_DEVICE, /* OpenBSD /dev/pci */ PCI_ACCESS_DUMP, /* Dump file */ PCI_ACCESS_DARWIN, /* Darwin */ PCI_ACCESS_SYLIXOS_DEVICE, /* SylixOS pci */ PCI_ACCESS_HURD, /* GNU/Hurd */ PCI_ACCESS_WIN32_CFGMGR32, /* Win32 cfgmgr32.dll */ PCI_ACCESS_WIN32_KLDBG, /* Win32 kldbgdrv.sys */ PCI_ACCESS_WIN32_SYSDBG, /* Win32 NT SysDbg */ PCI_ACCESS_MMIO_TYPE1, /* MMIO ports, type 1 */ PCI_ACCESS_MMIO_TYPE1_EXT, /* MMIO ports, type 1 extended */ PCI_ACCESS_ECAM, /* PCIe ECAM via /dev/mem */ PCI_ACCESS_AOS_EXPANSION, /* AmigaOS Expansion library */ PCI_ACCESS_RT_THREAD_SMART_DM, /* RT-Thread Smart pci */ PCI_ACCESS_MAX }; struct pci_access { /* Options you can change: */ unsigned int method; /* Access method */ int writeable; /* Open in read/write mode */ int buscentric; /* Bus-centric view of the world */ char *id_file_name; /* Name of ID list file (use pci_set_name_list_path()) */ int free_id_name; /* Set if id_file_name is malloced */ int numeric_ids; /* Enforce PCI_LOOKUP_NUMERIC (>1 => PCI_LOOKUP_MIXED) */ unsigned int id_lookup_mode; /* pci_lookup_mode flags which are set automatically */ /* Default: PCI_LOOKUP_CACHE */ int debugging; /* Turn on debugging messages */ /* Functions you can override: */ void (*error)(char *msg, ...) PCI_PRINTF(1,2) PCI_NONRET; /* Write error message and quit */ void (*warning)(char *msg, ...) PCI_PRINTF(1,2); /* Write a warning message */ void (*debug)(char *msg, ...) PCI_PRINTF(1,2); /* Write a debugging message */ struct pci_dev *devices; /* Devices found on this bus */ /* Fields used internally: */ struct pci_methods *methods; struct pci_param *params; struct id_entry **id_hash; /* names.c */ struct id_bucket *current_id_bucket; int id_load_attempted; int id_cache_status; /* 0=not read, 1=read, 2=dirty */ char *id_cache_name; struct udev *id_udev; /* names-hwdb.c */ struct udev_hwdb *id_udev_hwdb; int fd; /* proc/sys: fd for config space */ int fd_rw; /* proc/sys: fd opened read-write */ int fd_vpd; /* sys: fd for VPD */ struct pci_dev *cached_dev; /* proc/sys: device the fds are for */ void *backend_data; /* Private data of the back end */ }; /* Initialize PCI access */ struct pci_access *pci_alloc(void) PCI_ABI; void pci_init(struct pci_access *) PCI_ABI; void pci_cleanup(struct pci_access *) PCI_ABI; /* Scanning of devices */ void pci_scan_bus(struct pci_access *acc) PCI_ABI; struct pci_dev *pci_get_dev(struct pci_access *acc, int domain, int bus, int dev, int func) PCI_ABI; /* Raw access to specified device */ void pci_free_dev(struct pci_dev *) PCI_ABI; /* Names of access methods */ int pci_lookup_method(char *name) PCI_ABI; /* Returns -1 if not found */ char *pci_get_method_name(int index) PCI_ABI; /* Returns "" if unavailable, NULL if index out of range */ /* * Named parameters */ struct pci_param { struct pci_param *next; /* Please use pci_walk_params() for traversing the list */ char *param; /* Name of the parameter */ char *value; /* Value of the parameter */ int value_malloced; /* used internally */ char *help; /* Explanation of the parameter */ }; char *pci_get_param(struct pci_access *acc, char *param) PCI_ABI; int pci_set_param(struct pci_access *acc, char *param, char *value) PCI_ABI; /* 0 on success, -1 if no such parameter */ /* To traverse the list, call pci_walk_params repeatedly, first with prev=NULL, and do not modify the parameters during traversal. */ struct pci_param *pci_walk_params(struct pci_access *acc, struct pci_param *prev) PCI_ABI; /* * Devices */ struct pci_dev { struct pci_dev *next; /* Next device in the chain */ u16 domain_16; /* 16-bit version of the PCI domain for backward compatibility */ /* 0xffff if the real domain doesn't fit in 16 bits */ u8 bus, dev, func; /* Bus inside domain, device and function */ /* These fields are set by pci_fill_info() */ unsigned int known_fields; /* Set of info fields already known (see pci_fill_info()) */ u16 vendor_id, device_id; /* Identity of the device */ u16 device_class; /* PCI device class */ int irq; /* IRQ number */ pciaddr_t base_addr[6]; /* Base addresses including flags in lower bits */ pciaddr_t size[6]; /* Region sizes */ pciaddr_t rom_base_addr; /* Expansion ROM base address */ pciaddr_t rom_size; /* Expansion ROM size */ struct pci_cap *first_cap; /* List of capabilities */ char *phy_slot; /* Physical slot */ char *module_alias; /* Linux kernel module alias */ char *label; /* Device name as exported by BIOS */ int numa_node; /* NUMA node */ pciaddr_t flags[6]; /* PCI_IORESOURCE_* flags for regions */ pciaddr_t rom_flags; /* PCI_IORESOURCE_* flags for expansion ROM */ int domain; /* PCI domain (host bridge) */ pciaddr_t bridge_base_addr[4]; /* Bridge base addresses (without flags) */ pciaddr_t bridge_size[4]; /* Bridge sizes */ pciaddr_t bridge_flags[4]; /* PCI_IORESOURCE_* flags for bridge addresses */ u8 prog_if, rev_id; /* Programming interface for device_class and revision id */ u16 subsys_vendor_id, subsys_id; /* Subsystem vendor id and subsystem id */ struct pci_dev *parent; /* Parent device, does not have to be always accessible */ int no_config_access; /* No access to config space for this device */ u32 rcd_link_cap; /* Link Capabilities register for Restricted CXL Devices */ u16 rcd_link_status; /* Link Status register for RCD */ u16 rcd_link_ctrl; /* Link Control register for RCD */ struct pci_msi_routing *msi_routing; /* Routing of MSI or MSI-X interrupts */ /* Fields used internally */ struct pci_access *access; struct pci_methods *methods; u8 *cache; /* Cached config registers */ int cache_len; int hdrtype; /* Cached low 7 bits of header type, -1 if unknown */ void *backend_data; /* Private data for of the back end */ struct pci_property *properties; /* A linked list of extra properties */ struct pci_cap *last_cap; /* Last capability in the list */ }; #define PCI_ADDR_IO_MASK (~(pciaddr_t) 0x3) #define PCI_ADDR_MEM_MASK (~(pciaddr_t) 0xf) #define PCI_ADDR_FLAG_MASK 0xf /* Access to configuration space */ u8 pci_read_byte(struct pci_dev *, int pos) PCI_ABI; u16 pci_read_word(struct pci_dev *, int pos) PCI_ABI; u32 pci_read_long(struct pci_dev *, int pos) PCI_ABI; int pci_read_vpd(struct pci_dev *d, int pos, u8 *buf, int len) PCI_ABI; int pci_write_byte(struct pci_dev *, int pos, u8 data) PCI_ABI; int pci_write_word(struct pci_dev *, int pos, u16 data) PCI_ABI; int pci_write_long(struct pci_dev *, int pos, u32 data) PCI_ABI; /* Configuration space as a sequence of bytes (little-endian) */ int pci_read_block(struct pci_dev *, int pos, u8 *buf, int len) PCI_ABI; int pci_write_block(struct pci_dev *, int pos, u8 *buf, int len) PCI_ABI; /* * Most device properties take some effort to obtain, so libpci does not * initialize them during default bus scan. Instead, you have to call * pci_fill_info() with the proper PCI_FILL_xxx constants OR'ed together. * * Some properties are stored directly in the pci_dev structure. * The remaining ones can be accessed through pci_get_string_property(). * * pci_fill_info() returns the current value of pci_dev->known_fields. * This is a bit mask of all fields, which were already obtained during * the lifetime of the device. This includes fields which are not supported * by the particular device -- in that case, the field is left at its default * value, which is 0 for integer fields and NULL for pointers. On the other * hand, we never consider known fields unsupported by the current back-end; * such fields always contain the default value. * * XXX: flags and the result should be unsigned, but we do not want to break the ABI. */ int pci_fill_info(struct pci_dev *, int flags) PCI_ABI; char *pci_get_string_property(struct pci_dev *d, u32 prop) PCI_ABI; #define PCI_FILL_IDENT 0x0001 /* vendor and device ID */ #define PCI_FILL_IRQ 0x0002 #define PCI_FILL_BASES 0x0004 #define PCI_FILL_ROM_BASE 0x0008 #define PCI_FILL_SIZES 0x0010 #define PCI_FILL_CLASS 0x0020 #define PCI_FILL_CAPS 0x0040 /* capabilities */ #define PCI_FILL_EXT_CAPS 0x0080 /* extended capabilities */ #define PCI_FILL_PHYS_SLOT 0x0100 /* physical slot (string property) */ #define PCI_FILL_MODULE_ALIAS 0x0200 /* Linux kernel module alias (string property) */ #define PCI_FILL_LABEL 0x0400 /* (string property) */ #define PCI_FILL_NUMA_NODE 0x0800 #define PCI_FILL_IO_FLAGS 0x1000 #define PCI_FILL_DT_NODE 0x2000 /* Device tree node (string property) */ #define PCI_FILL_IOMMU_GROUP 0x4000 /* (string property) */ #define PCI_FILL_BRIDGE_BASES 0x8000 #define PCI_FILL_RESCAN 0x00010000 /* force re-scan of cached properties */ #define PCI_FILL_CLASS_EXT 0x00020000 /* prog_if and rev_id */ #define PCI_FILL_SUBSYS 0x00040000 /* subsys_vendor_id and subsys_id */ #define PCI_FILL_PARENT 0x00080000 #define PCI_FILL_DRIVER 0x00100000 /* OS driver currently in use (string property) */ #define PCI_FILL_RCD_LNK 0x00200000 /* CXL RCD Link status properties (rcd_*) */ #define PCI_FILL_MSI_ROUTING 0x00400000 /* MSI interrupt routing (msi_routing) */ void pci_setup_cache(struct pci_dev *, u8 *cache, int len) PCI_ABI; struct pci_msi_routing { struct pci_msi_routing *next; int irq; }; /* * Capabilities */ struct pci_cap { struct pci_cap *next; u16 id; /* PCI_CAP_ID_xxx */ u16 type; /* PCI_CAP_xxx */ unsigned int addr; /* Position in the config space */ }; #define PCI_CAP_NORMAL 1 /* Traditional PCI capabilities */ #define PCI_CAP_EXTENDED 2 /* PCIe extended capabilities */ struct pci_cap *pci_find_cap(struct pci_dev *, unsigned int id, unsigned int type) PCI_ABI; struct pci_cap *pci_find_cap_nr(struct pci_dev *, unsigned int id, unsigned int type, unsigned int *cap_number) PCI_ABI; /* * Filters */ struct pci_filter { int domain, bus, slot, func; /* -1 = ANY */ int vendor, device; int device_class; unsigned int device_class_mask; /* Which bits of the device_class are compared, default=all */ int prog_if; int rfu[1]; }; void pci_filter_init(struct pci_access *, struct pci_filter *) PCI_ABI; char *pci_filter_parse_slot(struct pci_filter *, char *) PCI_ABI; char *pci_filter_parse_id(struct pci_filter *, char *) PCI_ABI; int pci_filter_match(struct pci_filter *, struct pci_dev *) PCI_ABI; int pci_filter_has_slot(struct pci_filter *) PCI_ABI; int pci_filter_has_id(struct pci_filter *) PCI_ABI; /* * Conversion of PCI IDs to names (according to the pci.ids file) * * Call pci_lookup_name() to identify different types of IDs: * * VENDOR (vendorID) -> vendor * DEVICE (vendorID, deviceID) -> device * VENDOR | DEVICE (vendorID, deviceID) -> combined vendor and device * SUBSYSTEM | VENDOR (subvendorID) -> subsystem vendor * SUBSYSTEM | DEVICE (vendorID, deviceID, subvendorID, subdevID) -> subsystem device * SUBSYSTEM | VENDOR | DEVICE (vendorID, deviceID, subvendorID, subdevID) -> combined subsystem v+d * SUBSYSTEM | ... (-1, -1, subvendorID, subdevID) -> generic subsystem * CLASS (classID) -> class * PROGIF (classID, progif) -> programming interface */ char *pci_lookup_name(struct pci_access *a, char *buf, int size, int flags, ...) PCI_ABI; int pci_load_name_list(struct pci_access *a) PCI_ABI; /* Called automatically by pci_lookup_*() when needed; returns success */ void pci_free_name_list(struct pci_access *a) PCI_ABI; /* Called automatically by pci_cleanup() */ void pci_set_name_list_path(struct pci_access *a, char *name, int to_be_freed) PCI_ABI; void pci_id_cache_flush(struct pci_access *a) PCI_ABI; enum pci_lookup_mode { PCI_LOOKUP_VENDOR = 1, /* Vendor name (args: vendorID) */ PCI_LOOKUP_DEVICE = 2, /* Device name (args: vendorID, deviceID) */ PCI_LOOKUP_CLASS = 4, /* Device class (args: classID) */ PCI_LOOKUP_SUBSYSTEM = 8, PCI_LOOKUP_PROGIF = 16, /* Programming interface (args: classID, prog_if) */ PCI_LOOKUP_NUMERIC = 0x10000, /* Want only formatted numbers; default if access->numeric_ids is set */ PCI_LOOKUP_NO_NUMBERS = 0x20000, /* Return NULL if not found in the database; default is to print numerically */ PCI_LOOKUP_MIXED = 0x40000, /* Include both numbers and names */ PCI_LOOKUP_NETWORK = 0x80000, /* Try to resolve unknown IDs by DNS */ PCI_LOOKUP_SKIP_LOCAL = 0x100000, /* Do not consult local database */ PCI_LOOKUP_CACHE = 0x200000, /* Consult the local cache before using DNS */ PCI_LOOKUP_REFRESH_CACHE = 0x400000, /* Forget all previously cached entries, but still allow updating the cache */ PCI_LOOKUP_NO_HWDB = 0x800000, /* Do not ask udev's hwdb */ }; #ifdef __cplusplus } #endif #endif