diff options
Diffstat (limited to 'lib/pci.h')
| -rw-r--r-- | lib/pci.h | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/lib/pci.h b/lib/pci.h new file mode 100644 index 0000000..ae1333f --- /dev/null +++ b/lib/pci.h @@ -0,0 +1,312 @@ +/* + * The PCI Library + * + * Copyright (c) 1997--2024 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 + +#ifndef PCI_CONFIG_H +#include "config.h" +#endif + +#include "header.h" +#include "types.h" + +#define PCI_LIB_VERSION 0x030b01 + +#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_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 */ + + /* 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 +#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 +#define PCI_FILL_EXT_CAPS 0x0080 +#define PCI_FILL_PHYS_SLOT 0x0100 +#define PCI_FILL_MODULE_ALIAS 0x0200 +#define PCI_FILL_LABEL 0x0400 +#define PCI_FILL_NUMA_NODE 0x0800 +#define PCI_FILL_IO_FLAGS 0x1000 +#define PCI_FILL_DT_NODE 0x2000 /* Device tree node */ +#define PCI_FILL_IOMMU_GROUP 0x4000 +#define PCI_FILL_BRIDGE_BASES 0x8000 +#define PCI_FILL_RESCAN 0x00010000 +#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) */ + +void pci_setup_cache(struct pci_dev *, u8 *cache, int len) PCI_ABI; + +/* + * 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; + +/* + * Conversion of PCI ID's to names (according to the pci.ids file) + * + * Call pci_lookup_name() to identify different types of ID's: + * + * 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 ID's 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 */ +}; + +#endif |