lib/pci.h

   1 /*
   2  *      The PCI Library
   3  *
   4  *      Copyright (c) 1997--2025 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL v2+
   7  *
   8  *      SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #ifndef _PCI_LIB_H
  12 #define _PCI_LIB_H
  13
  14 #ifdef  __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 #ifndef PCI_CONFIG_H
  19 #include "config.h"
  20 #endif
  21
  22 #include "header.h"
  23 #include "types.h"
  24
  25 #define PCI_LIB_VERSION 0x030e00
  26
  27 #ifndef PCI_ABI
  28 #define PCI_ABI
  29 #endif
  30
  31 /*
  32  *      PCI Access Structure
  33  */
  34
  35 struct pci_methods;
  36
  37 enum pci_access_type {
  38   /* Known access methods, remember to update init.c as well */
  39   PCI_ACCESS_AUTO,                      /* Autodetection */
  40   PCI_ACCESS_SYS_BUS_PCI,               /* Linux /sys/bus/pci */
  41   PCI_ACCESS_PROC_BUS_PCI,              /* Linux /proc/bus/pci */
  42   PCI_ACCESS_I386_TYPE1,                /* i386 ports, type 1 */
  43   PCI_ACCESS_I386_TYPE2,                /* i386 ports, type 2 */
  44   PCI_ACCESS_FBSD_DEVICE,               /* FreeBSD /dev/pci */
  45   PCI_ACCESS_AIX_DEVICE,                /* /dev/pci0, /dev/bus0, etc. */
  46   PCI_ACCESS_NBSD_LIBPCI,               /* NetBSD libpci */
  47   PCI_ACCESS_OBSD_DEVICE,               /* OpenBSD /dev/pci */
  48   PCI_ACCESS_DUMP,                      /* Dump file */
  49   PCI_ACCESS_DARWIN,                    /* Darwin */
  50   PCI_ACCESS_SYLIXOS_DEVICE,            /* SylixOS pci */
  51   PCI_ACCESS_HURD,                      /* GNU/Hurd */
  52   PCI_ACCESS_WIN32_CFGMGR32,            /* Win32 cfgmgr32.dll */
  53   PCI_ACCESS_WIN32_KLDBG,               /* Win32 kldbgdrv.sys */
  54   PCI_ACCESS_WIN32_SYSDBG,              /* Win32 NT SysDbg */
  55   PCI_ACCESS_MMIO_TYPE1,                /* MMIO ports, type 1 */
  56   PCI_ACCESS_MMIO_TYPE1_EXT,            /* MMIO ports, type 1 extended */
  57   PCI_ACCESS_ECAM,                      /* PCIe ECAM via /dev/mem */
  58   PCI_ACCESS_AOS_EXPANSION,             /* AmigaOS Expansion library */
  59   PCI_ACCESS_RT_THREAD_SMART_DM,        /* RT-Thread Smart pci */
  60   PCI_ACCESS_MAX
  61 };
  62
  63 struct pci_access {
  64   /* Options you can change: */
  65   unsigned int method;                  /* Access method */
  66   int writeable;                        /* Open in read/write mode */
  67   int buscentric;                       /* Bus-centric view of the world */
  68
  69   char *id_file_name;                   /* Name of ID list file (use pci_set_name_list_path()) */
  70   int free_id_name;                     /* Set if id_file_name is malloced */
  71   int numeric_ids;                      /* Enforce PCI_LOOKUP_NUMERIC (>1 => PCI_LOOKUP_MIXED) */
  72
  73   unsigned int id_lookup_mode;          /* pci_lookup_mode flags which are set automatically */
  74                                         /* Default: PCI_LOOKUP_CACHE */
  75
  76   int debugging;                        /* Turn on debugging messages */
  77
  78   /* Functions you can override: */
  79   void (*error)(char *msg, ...) PCI_PRINTF(1,2) PCI_NONRET;     /* Write error message and quit */
  80   void (*warning)(char *msg, ...) PCI_PRINTF(1,2);      /* Write a warning message */
  81   void (*debug)(char *msg, ...) PCI_PRINTF(1,2);        /* Write a debugging message */
  82
  83   struct pci_dev *devices;              /* Devices found on this bus */
  84
  85   /* Fields used internally: */
  86   struct pci_methods *methods;
  87   struct pci_param *params;
  88   struct id_entry **id_hash;            /* names.c */
  89   struct id_bucket *current_id_bucket;
  90   int id_load_attempted;
  91   int id_cache_status;                  /* 0=not read, 1=read, 2=dirty */
  92   char *id_cache_name;
  93   struct udev *id_udev;                 /* names-hwdb.c */
  94   struct udev_hwdb *id_udev_hwdb;
  95   int fd;                               /* proc/sys: fd for config space */
  96   int fd_rw;                            /* proc/sys: fd opened read-write */
  97   int fd_vpd;                           /* sys: fd for VPD */
  98   struct pci_dev *cached_dev;           /* proc/sys: device the fds are for */
  99   void *backend_data;                   /* Private data of the back end */
 100 };
 101
 102 /* Initialize PCI access */
 103 struct pci_access *pci_alloc(void) PCI_ABI;
 104 void pci_init(struct pci_access *) PCI_ABI;
 105 void pci_cleanup(struct pci_access *) PCI_ABI;
 106
 107 /* Scanning of devices */
 108 void pci_scan_bus(struct pci_access *acc) PCI_ABI;
 109 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 */
 110 void pci_free_dev(struct pci_dev *) PCI_ABI;
 111
 112 /* Names of access methods */
 113 int pci_lookup_method(char *name) PCI_ABI;      /* Returns -1 if not found */
 114 char *pci_get_method_name(int index) PCI_ABI;   /* Returns "" if unavailable, NULL if index out of range */
 115
 116 /*
 117  *      Named parameters
 118  */
 119
 120 struct pci_param {
 121   struct pci_param *next;               /* Please use pci_walk_params() for traversing the list */
 122   char *param;                          /* Name of the parameter */
 123   char *value;                          /* Value of the parameter */
 124   int value_malloced;                   /* used internally */
 125   char *help;                           /* Explanation of the parameter */
 126 };
 127
 128 char *pci_get_param(struct pci_access *acc, char *param) PCI_ABI;
 129 int pci_set_param(struct pci_access *acc, char *param, char *value) PCI_ABI;    /* 0 on success, -1 if no such parameter */
 130 /* To traverse the list, call pci_walk_params repeatedly, first with prev=NULL, and do not modify the parameters during traversal. */
 131 struct pci_param *pci_walk_params(struct pci_access *acc, struct pci_param *prev) PCI_ABI;
 132
 133 /*
 134  *      Devices
 135  */
 136
 137 struct pci_dev {
 138   struct pci_dev *next;                 /* Next device in the chain */
 139   u16 domain_16;                        /* 16-bit version of the PCI domain for backward compatibility */
 140                                         /* 0xffff if the real domain doesn't fit in 16 bits */
 141   u8 bus, dev, func;                    /* Bus inside domain, device and function */
 142
 143   /* These fields are set by pci_fill_info() */
 144   unsigned int known_fields;            /* Set of info fields already known (see pci_fill_info()) */
 145   u16 vendor_id, device_id;             /* Identity of the device */
 146   u16 device_class;                     /* PCI device class */
 147   int irq;                              /* IRQ number */
 148   pciaddr_t base_addr[6];               /* Base addresses including flags in lower bits */
 149   pciaddr_t size[6];                    /* Region sizes */
 150   pciaddr_t rom_base_addr;              /* Expansion ROM base address */
 151   pciaddr_t rom_size;                   /* Expansion ROM size */
 152   struct pci_cap *first_cap;            /* List of capabilities */
 153   char *phy_slot;                       /* Physical slot */
 154   char *module_alias;                   /* Linux kernel module alias */
 155   char *label;                          /* Device name as exported by BIOS */
 156   int numa_node;                        /* NUMA node */
 157   pciaddr_t flags[6];                   /* PCI_IORESOURCE_* flags for regions */
 158   pciaddr_t rom_flags;                  /* PCI_IORESOURCE_* flags for expansion ROM */
 159   int domain;                           /* PCI domain (host bridge) */
 160   pciaddr_t bridge_base_addr[4];        /* Bridge base addresses (without flags) */
 161   pciaddr_t bridge_size[4];             /* Bridge sizes */
 162   pciaddr_t bridge_flags[4];            /* PCI_IORESOURCE_* flags for bridge addresses */
 163   u8 prog_if, rev_id;                   /* Programming interface for device_class and revision id */
 164   u16 subsys_vendor_id, subsys_id;      /* Subsystem vendor id and subsystem id */
 165   struct pci_dev *parent;               /* Parent device, does not have to be always accessible */
 166   int no_config_access;                 /* No access to config space for this device */
 167   u32 rcd_link_cap;                     /* Link Capabilities register for Restricted CXL Devices */
 168   u16 rcd_link_status;                  /* Link Status register for RCD */
 169   u16 rcd_link_ctrl;                    /* Link Control register for RCD */
 170
 171   /* Fields used internally */
 172   struct pci_access *access;
 173   struct pci_methods *methods;
 174   u8 *cache;                            /* Cached config registers */
 175   int cache_len;
 176   int hdrtype;                          /* Cached low 7 bits of header type, -1 if unknown */
 177   void *backend_data;                   /* Private data for of the back end */
 178   struct pci_property *properties;      /* A linked list of extra properties */
 179   struct pci_cap *last_cap;             /* Last capability in the list */
 180 };
 181
 182 #define PCI_ADDR_IO_MASK (~(pciaddr_t) 0x3)
 183 #define PCI_ADDR_MEM_MASK (~(pciaddr_t) 0xf)
 184 #define PCI_ADDR_FLAG_MASK 0xf
 185
 186 /* Access to configuration space */
 187 u8 pci_read_byte(struct pci_dev *, int pos) PCI_ABI;
 188 u16 pci_read_word(struct pci_dev *, int pos) PCI_ABI;
 189 u32 pci_read_long(struct pci_dev *, int pos) PCI_ABI;
 190 int pci_read_vpd(struct pci_dev *d, int pos, u8 *buf, int len) PCI_ABI;
 191 int pci_write_byte(struct pci_dev *, int pos, u8 data) PCI_ABI;
 192 int pci_write_word(struct pci_dev *, int pos, u16 data) PCI_ABI;
 193 int pci_write_long(struct pci_dev *, int pos, u32 data) PCI_ABI;
 194
 195 /* Configuration space as a sequence of bytes (little-endian) */
 196 int pci_read_block(struct pci_dev *, int pos, u8 *buf, int len) PCI_ABI;
 197 int pci_write_block(struct pci_dev *, int pos, u8 *buf, int len) PCI_ABI;
 198
 199 /*
 200  * Most device properties take some effort to obtain, so libpci does not
 201  * initialize them during default bus scan. Instead, you have to call
 202  * pci_fill_info() with the proper PCI_FILL_xxx constants OR'ed together.
 203  *
 204  * Some properties are stored directly in the pci_dev structure.
 205  * The remaining ones can be accessed through pci_get_string_property().
 206  *
 207  * pci_fill_info() returns the current value of pci_dev->known_fields.
 208  * This is a bit mask of all fields, which were already obtained during
 209  * the lifetime of the device. This includes fields which are not supported
 210  * by the particular device -- in that case, the field is left at its default
 211  * value, which is 0 for integer fields and NULL for pointers. On the other
 212  * hand, we never consider known fields unsupported by the current back-end;
 213  * such fields always contain the default value.
 214  *
 215  * XXX: flags and the result should be unsigned, but we do not want to break the ABI.
 216  */
 217
 218 int pci_fill_info(struct pci_dev *, int flags) PCI_ABI;
 219 char *pci_get_string_property(struct pci_dev *d, u32 prop) PCI_ABI;
 220
 221 #define PCI_FILL_IDENT          0x0001          /* vendor and device ID */
 222 #define PCI_FILL_IRQ            0x0002
 223 #define PCI_FILL_BASES          0x0004
 224 #define PCI_FILL_ROM_BASE       0x0008
 225 #define PCI_FILL_SIZES          0x0010
 226 #define PCI_FILL_CLASS          0x0020
 227 #define PCI_FILL_CAPS           0x0040          /* capabilities */
 228 #define PCI_FILL_EXT_CAPS       0x0080          /* extended capabilities */
 229 #define PCI_FILL_PHYS_SLOT      0x0100          /* physical slot (string property) */
 230 #define PCI_FILL_MODULE_ALIAS   0x0200          /* Linux kernel module alias (string property) */
 231 #define PCI_FILL_LABEL          0x0400          /* (string property) */
 232 #define PCI_FILL_NUMA_NODE      0x0800
 233 #define PCI_FILL_IO_FLAGS       0x1000
 234 #define PCI_FILL_DT_NODE        0x2000          /* Device tree node (string property) */
 235 #define PCI_FILL_IOMMU_GROUP    0x4000          /* (string property) */
 236 #define PCI_FILL_BRIDGE_BASES   0x8000
 237 #define PCI_FILL_RESCAN         0x00010000      /* force re-scan of cached properties */
 238 #define PCI_FILL_CLASS_EXT      0x00020000      /* prog_if and rev_id */
 239 #define PCI_FILL_SUBSYS         0x00040000      /* subsys_vendor_id and subsys_id */
 240 #define PCI_FILL_PARENT         0x00080000
 241 #define PCI_FILL_DRIVER         0x00100000      /* OS driver currently in use (string property) */
 242 #define PCI_FILL_RCD_LNK        0x00200000      /* CXL RCD Link status properties (rcd_*) */
 243
 244 void pci_setup_cache(struct pci_dev *, u8 *cache, int len) PCI_ABI;
 245
 246 /*
 247  *      Capabilities
 248  */
 249
 250 struct pci_cap {
 251   struct pci_cap *next;
 252   u16 id;                               /* PCI_CAP_ID_xxx */
 253   u16 type;                             /* PCI_CAP_xxx */
 254   unsigned int addr;                    /* Position in the config space */
 255 };
 256
 257 #define PCI_CAP_NORMAL          1       /* Traditional PCI capabilities */
 258 #define PCI_CAP_EXTENDED        2       /* PCIe extended capabilities */
 259
 260 struct pci_cap *pci_find_cap(struct pci_dev *, unsigned int id, unsigned int type) PCI_ABI;
 261 struct pci_cap *pci_find_cap_nr(struct pci_dev *, unsigned int id, unsigned int type,
 262                                 unsigned int *cap_number) PCI_ABI;
 263
 264 /*
 265  *      Filters
 266  */
 267
 268 struct pci_filter {
 269   int domain, bus, slot, func;                  /* -1 = ANY */
 270   int vendor, device;
 271   int device_class;
 272   unsigned int device_class_mask;               /* Which bits of the device_class are compared, default=all */
 273   int prog_if;
 274   int rfu[1];
 275 };
 276
 277 void pci_filter_init(struct pci_access *, struct pci_filter *) PCI_ABI;
 278 char *pci_filter_parse_slot(struct pci_filter *, char *) PCI_ABI;
 279 char *pci_filter_parse_id(struct pci_filter *, char *) PCI_ABI;
 280 int pci_filter_match(struct pci_filter *, struct pci_dev *) PCI_ABI;
 281
 282 /*
 283  *      Conversion of PCI ID's to names (according to the pci.ids file)
 284  *
 285  *      Call pci_lookup_name() to identify different types of ID's:
 286  *
 287  *      VENDOR                          (vendorID) -> vendor
 288  *      DEVICE                          (vendorID, deviceID) -> device
 289  *      VENDOR | DEVICE                 (vendorID, deviceID) -> combined vendor and device
 290  *      SUBSYSTEM | VENDOR              (subvendorID) -> subsystem vendor
 291  *      SUBSYSTEM | DEVICE              (vendorID, deviceID, subvendorID, subdevID) -> subsystem device
 292  *      SUBSYSTEM | VENDOR | DEVICE     (vendorID, deviceID, subvendorID, subdevID) -> combined subsystem v+d
 293  *      SUBSYSTEM | ...                 (-1, -1, subvendorID, subdevID) -> generic subsystem
 294  *      CLASS                           (classID) -> class
 295  *      PROGIF                          (classID, progif) -> programming interface
 296  */
 297
 298 char *pci_lookup_name(struct pci_access *a, char *buf, int size, int flags, ...) PCI_ABI;
 299
 300 int pci_load_name_list(struct pci_access *a) PCI_ABI;   /* Called automatically by pci_lookup_*() when needed; returns success */
 301 void pci_free_name_list(struct pci_access *a) PCI_ABI;  /* Called automatically by pci_cleanup() */
 302 void pci_set_name_list_path(struct pci_access *a, char *name, int to_be_freed) PCI_ABI;
 303 void pci_id_cache_flush(struct pci_access *a) PCI_ABI;
 304
 305 enum pci_lookup_mode {
 306   PCI_LOOKUP_VENDOR = 1,                /* Vendor name (args: vendorID) */
 307   PCI_LOOKUP_DEVICE = 2,                /* Device name (args: vendorID, deviceID) */
 308   PCI_LOOKUP_CLASS = 4,                 /* Device class (args: classID) */
 309   PCI_LOOKUP_SUBSYSTEM = 8,
 310   PCI_LOOKUP_PROGIF = 16,               /* Programming interface (args: classID, prog_if) */
 311   PCI_LOOKUP_NUMERIC = 0x10000,         /* Want only formatted numbers; default if access->numeric_ids is set */
 312   PCI_LOOKUP_NO_NUMBERS = 0x20000,      /* Return NULL if not found in the database; default is to print numerically */
 313   PCI_LOOKUP_MIXED = 0x40000,           /* Include both numbers and names */
 314   PCI_LOOKUP_NETWORK = 0x80000,         /* Try to resolve unknown ID's by DNS */
 315   PCI_LOOKUP_SKIP_LOCAL = 0x100000,     /* Do not consult local database */
 316   PCI_LOOKUP_CACHE = 0x200000,          /* Consult the local cache before using DNS */
 317   PCI_LOOKUP_REFRESH_CACHE = 0x400000,  /* Forget all previously cached entries, but still allow updating the cache */
 318   PCI_LOOKUP_NO_HWDB = 0x800000,        /* Do not ask udev's hwdb */
 319 };
 320
 321 #ifdef  __cplusplus
 322 }
 323 #endif
 324
 325 #endif