sys/sys/device.h

   1 /*
   2  * Copyright (c) 2003,2004,2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/sys/device.h,v 1.11 2007/05/17 03:02:00 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_DEVICE_H_
  38 #define _SYS_DEVICE_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43 #ifndef _SYS_TREE_H_
  44 #include <sys/tree.h>
  45 #endif
  46 #ifndef _SYS_SYSLINK_RPC_H_
  47 #include <sys/syslink_rpc.h>
  48 #endif
  49
  50 struct cdev;
  51 struct ucred;
  52 struct devfs_bitmap;
  53
  54 /*
  55  * This structure is at the base of every device args structure
  56  */
  57 struct dev_generic_args {
  58         struct syslink_desc *a_desc;
  59         struct cdev *a_dev;
  60 };
  61
  62 typedef struct dev_generic_args dev_default_args;
  63
  64 /*
  65  * int d_open(cdev_t dev, int oflags, int devtype, struct ucred *cred)
  66  */
  67 struct dev_open_args {
  68         struct dev_generic_args a_head;
  69         int             a_oflags;
  70         int             a_devtype;
  71         struct ucred    *a_cred;
  72 };
  73
  74 /*
  75  * int d_close(cdev_t dev, int fflag, int devtype)
  76  */
  77 struct dev_close_args {
  78         struct dev_generic_args a_head;
  79         int             a_fflag;
  80         int             a_devtype;
  81 };
  82
  83 /*
  84  * int d_read(cdev_t dev, struct uio *uio, int ioflag)
  85  */
  86 struct dev_read_args {
  87         struct dev_generic_args a_head;
  88         struct uio      *a_uio;
  89         int             a_ioflag;
  90 };
  91
  92 /*
  93  * int d_write(cdev_t dev, struct uio *uio, int ioflag)
  94  */
  95 struct dev_write_args {
  96         struct dev_generic_args a_head;
  97         struct uio      *a_uio;
  98         int             a_ioflag;
  99 };
 100
 101 /*
 102  * int d_ioctl(cdev_t dev, u_long cmd, caddr_t data, int fflag,
 103  *             struct ucred *cred, struct sysmsg *msg)
 104  */
 105 struct dev_ioctl_args {
 106         struct dev_generic_args a_head;
 107         u_long          a_cmd;
 108         caddr_t         a_data;
 109         int             a_fflag;
 110         struct ucred    *a_cred;
 111         struct sysmsg   *a_sysmsg;
 112 };
 113
 114 /*
 115  * int d_poll(cdev_t dev, int events)
 116  */
 117 struct dev_poll_args {
 118         struct dev_generic_args a_head;
 119         int             a_events;
 120 };
 121
 122 /*
 123  * int d_mmap(cdev_t dev, vm_offset_t offset, int nprot)
 124  */
 125 struct dev_mmap_args {
 126         struct dev_generic_args a_head;
 127         vm_offset_t     a_offset;
 128         int             a_nprot;
 129         int             a_result;       /* page number */
 130 };
 131
 132 /*
 133  * void d_strategy(cdev_t dev, struct bio *bio)
 134  */
 135 struct dev_strategy_args {
 136         struct dev_generic_args a_head;
 137         struct bio      *a_bio;
 138 };
 139
 140 /*
 141  * void d_dump(cdev_t dev)
 142  */
 143 struct dev_dump_args {
 144         struct dev_generic_args a_head;
 145         u_int64_t       a_count;
 146         u_int64_t       a_blkno;
 147         u_int           a_secsize;
 148 };
 149
 150 /*
 151  * int d_psize(cdev_t dev)
 152  */
 153 struct dev_psize_args {
 154         struct dev_generic_args a_head;
 155         int64_t         a_result;
 156 };
 157
 158 /*
 159  * int d_kqfilter(cdev_t dev, struct knote *kn)
 160  */
 161 struct dev_kqfilter_args {
 162         struct dev_generic_args a_head;
 163         struct knote    *a_kn;
 164         int             a_result;
 165 };
 166
 167 /*
 168  * int d_clone(cdev_t dev);
 169  */
 170 struct dev_clone_args {
 171         struct dev_generic_args a_head;
 172
 173         struct cdev     *a_dev;
 174         const char      *a_name;
 175         size_t          a_namelen;
 176         struct ucred    *a_cred;
 177         int             a_mode;
 178 };
 179
 180 /*
 181  * int d_revoke(cdev_t dev)
 182  */
 183 struct dev_revoke_args {
 184         struct dev_generic_args a_head;
 185 };
 186
 187 /*
 188  * Typedefs to help drivers declare the driver routines and such
 189  */
 190 typedef int d_default_t (struct dev_generic_args *ap);
 191 typedef int d_open_t (struct dev_open_args *ap);
 192 typedef int d_close_t (struct dev_close_args *ap);
 193 typedef int d_read_t (struct dev_read_args *ap);
 194 typedef int d_write_t (struct dev_write_args *ap);
 195 typedef int d_ioctl_t (struct dev_ioctl_args *ap);
 196 typedef int d_poll_t (struct dev_poll_args *ap);
 197 typedef int d_mmap_t (struct dev_mmap_args *ap);
 198 typedef int d_strategy_t (struct dev_strategy_args *ap);
 199 typedef int d_dump_t (struct dev_dump_args *ap);
 200 typedef int d_psize_t (struct dev_psize_args *ap);
 201 typedef int d_kqfilter_t (struct dev_kqfilter_args *ap);
 202 typedef int d_clone_t (struct dev_clone_args *ap);
 203 typedef int d_revoke_t (struct dev_revoke_args *ap);
 204
 205 /*
 206  * Character device switch table.
 207  *
 208  * NOTE: positions are hard coded for static structure initialization.
 209  */
 210 struct dev_ops {
 211         struct {
 212                 const char      *name;  /* base name, e.g. 'da' */
 213                 int                     maj;    /* major device number */
 214                 u_int           flags;  /* D_XXX flags */
 215                 void            *data;  /* custom driver data */
 216                 int                     refs;   /* ref count */
 217                 int                     id;
 218         } head;
 219
 220 #define dev_ops_first_field     d_default
 221         d_default_t     *d_default;
 222         d_open_t        *d_open;
 223         d_close_t       *d_close;
 224         d_read_t        *d_read;
 225         d_write_t       *d_write;
 226         d_ioctl_t       *d_ioctl;
 227         d_poll_t        *d_poll;
 228         d_mmap_t        *d_mmap;
 229         d_strategy_t    *d_strategy;
 230         d_dump_t        *d_dump;
 231         d_psize_t       *d_psize;
 232         d_kqfilter_t    *d_kqfilter;
 233         d_clone_t       *d_clone;       /* clone from base dev_ops */
 234         d_revoke_t      *d_revoke;
 235 #define dev_ops_last_field      d_revoke
 236 };
 237
 238 /*
 239  * Types for d_flags.
 240  */
 241 #define D_TAPE          0x0001
 242 #define D_DISK          0x0002
 243 #define D_TTY           0x0004
 244 #define D_MEM           0x0008
 245
 246 #define D_TYPEMASK      0xffff
 247 #define D_SEEKABLE      (D_TAPE | D_DISK | D_MEM)
 248
 249 /*
 250  * Flags for d_flags.
 251  */
 252 #define D_MEMDISK       0x00010000      /* memory type disk */
 253 #define D_NAGGED        0x00020000      /* nagged about missing make_dev() */
 254 #define D_CANFREE       0x00040000      /* can free blocks */
 255 #define D_TRACKCLOSE    0x00080000      /* track all closes */
 256 #define D_MASTER        0x00100000      /* used by pty/tty code */
 257 #define D_KQFILTER      0x00200000      /* has kqfilter entry */
 258
 259 /*
 260  * A union of all possible argument structures.
 261  */
 262 union dev_args_union {
 263         struct dev_generic_args du_head;
 264         struct dev_open_args    du_open;
 265         struct dev_close_args   du_close;
 266         struct dev_read_args    du_read;
 267         struct dev_write_args   du_write;
 268         struct dev_ioctl_args   du_ioctl;
 269         struct dev_poll_args    du_poll;
 270         struct dev_mmap_args    du_mmap;
 271         struct dev_strategy_args du_strategy;
 272         struct dev_dump_args    du_dump;
 273         struct dev_psize_args   du_psize;
 274         struct dev_kqfilter_args du_kqfilter;
 275         struct dev_clone_args   du_clone;
 276 };
 277
 278 /*
 279  * Linking structure for mask/match registration
 280  */
 281 struct dev_ops_link {
 282         struct dev_ops_link *next;
 283         u_int           mask;
 284         u_int           match;
 285         struct dev_ops  *ops;
 286 };
 287
 288 struct dev_ops_maj {
 289         RB_ENTRY(dev_ops_maj) rbnode; /* red-black tree of major nums */
 290         struct dev_ops_link *link;
 291         int             maj;
 292 };
 293
 294 RB_HEAD(dev_ops_rb_tree, dev_ops_maj);
 295 RB_PROTOTYPE2(dev_ops_rb_tree, dev_ops_maj, rbnode, rb_dev_ops_compare, int);
 296
 297 #ifdef _KERNEL
 298
 299 extern struct dev_ops dead_dev_ops;
 300
 301 struct disk;
 302 struct sysmsg;
 303
 304 int dev_dopen(cdev_t dev, int oflags, int devtype, struct ucred *cred);
 305 int dev_dclose(cdev_t dev, int fflag, int devtype);
 306 void dev_dstrategy(cdev_t dev, struct bio *bio);
 307 void dev_dstrategy_chain(cdev_t dev, struct bio *bio);
 308 int dev_dioctl(cdev_t dev, u_long cmd, caddr_t data, int fflag,
 309                 struct ucred *cred, struct sysmsg *msg);
 310 int dev_ddump(cdev_t dev);
 311 int64_t dev_dpsize(cdev_t dev);
 312 int dev_dread(cdev_t dev, struct uio *uio, int ioflag);
 313 int dev_dwrite(cdev_t dev, struct uio *uio, int ioflag);
 314 int dev_dpoll(cdev_t dev, int events);
 315 int dev_dkqfilter(cdev_t dev, struct knote *kn);
 316 int dev_dmmap(cdev_t dev, vm_offset_t offset, int nprot);
 317 int dev_dclone(cdev_t dev);
 318 int dev_drevoke(cdev_t dev);
 319
 320 int dev_drefs(cdev_t dev);
 321 const char *dev_dname(cdev_t dev);
 322 int dev_dmaj(cdev_t dev);
 323 int dev_dflags(cdev_t dev);
 324 int dev_doperate(struct dev_generic_args *ap);
 325 int dev_doperate_ops(struct dev_ops *, struct dev_generic_args *ap);
 326
 327 d_default_t     nodefault;
 328 d_open_t        noopen;
 329 d_close_t       noclose;
 330 d_read_t        noread;
 331 d_write_t       nowrite;
 332 d_ioctl_t       noioctl;
 333 d_poll_t        nopoll;
 334 d_mmap_t        nommap;
 335 d_strategy_t    nostrategy;
 336 d_dump_t        nodump;
 337 d_psize_t       nopsize;
 338 d_kqfilter_t    nokqfilter;
 339 d_clone_t       noclone;
 340 d_revoke_t      norevoke;
 341
 342 d_open_t        nullopen;
 343 d_close_t       nullclose;
 344
 345 extern struct syslink_desc dev_default_desc;
 346 extern struct syslink_desc dev_open_desc;
 347 extern struct syslink_desc dev_close_desc;
 348 extern struct syslink_desc dev_read_desc;
 349 extern struct syslink_desc dev_write_desc;
 350 extern struct syslink_desc dev_ioctl_desc;
 351 extern struct syslink_desc dev_dump_desc;
 352 extern struct syslink_desc dev_psize_desc;
 353 extern struct syslink_desc dev_poll_desc;
 354 extern struct syslink_desc dev_mmap_desc;
 355 extern struct syslink_desc dev_strategu_desc;
 356 extern struct syslink_desc dev_kqfilter_desc;
 357 extern struct syslink_desc dev_clone_desc;
 358
 359 void compile_dev_ops(struct dev_ops *);
 360 int dev_ops_remove_all(struct dev_ops *ops);
 361 int dev_ops_remove_minor(struct dev_ops *ops, int minor);
 362 struct dev_ops *dev_ops_intercept(cdev_t, struct dev_ops *);
 363 void dev_ops_restore(cdev_t, struct dev_ops *);
 364
 365 cdev_t make_dev(struct dev_ops *ops, int minor, uid_t uid, gid_t gid,
 366                 int perms, const char *fmt, ...) __printflike(6, 7);
 367 cdev_t make_only_dev(struct dev_ops *ops, int minor, uid_t uid, gid_t gid,
 368                 int perms, const char *fmt, ...) __printflike(6, 7);
 369 cdev_t make_only_devfs_dev(struct dev_ops *ops, int minor, uid_t uid, gid_t gid,
 370                 int perms, const char *fmt, ...) __printflike(6, 7);
 371 void destroy_only_dev(cdev_t dev);
 372 int make_dev_alias(cdev_t target, const char *fmt, ...);
 373 cdev_t make_autoclone_dev(struct dev_ops *ops, struct devfs_bitmap *bitmap,
 374                 d_clone_t *nhandler, uid_t uid, gid_t gid, int perms, const char *fmt, ...);
 375 void destroy_autoclone_dev(cdev_t dev, struct devfs_bitmap *bitmap);
 376 void sync_devs(void);
 377
 378 #endif
 379
 380 #endif
 381