kern_conf.c revision 158684
1178825Sdfr/*- 2233294Sstas * Copyright (c) 1999-2002 Poul-Henning Kamp 3233294Sstas * All rights reserved. 4233294Sstas * 5178825Sdfr * Redistribution and use in source and binary forms, with or without 6233294Sstas * modification, are permitted provided that the following conditions 7233294Sstas * are met: 8233294Sstas * 1. Redistributions of source code must retain the above copyright 9178825Sdfr * notice, this list of conditions and the following disclaimer. 10233294Sstas * 2. Redistributions in binary form must reproduce the above copyright 11233294Sstas * notice, this list of conditions and the following disclaimer in the 12178825Sdfr * documentation and/or other materials provided with the distribution. 13233294Sstas * 14233294Sstas * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15233294Sstas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16178825Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17233294Sstas * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18233294Sstas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19233294Sstas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20178825Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21233294Sstas * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22233294Sstas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23233294Sstas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24233294Sstas * SUCH DAMAGE. 25233294Sstas */ 26233294Sstas 27233294Sstas#include <sys/cdefs.h> 28233294Sstas__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 158684 2006-05-17 06:37:14Z phk $"); 29233294Sstas 30233294Sstas#include <sys/param.h> 31233294Sstas#include <sys/kernel.h> 32178825Sdfr#include <sys/systm.h> 33178825Sdfr#include <sys/bio.h> 34233294Sstas#include <sys/lock.h> 35233294Sstas#include <sys/mutex.h> 36178825Sdfr#include <sys/module.h> 37178825Sdfr#include <sys/malloc.h> 38178825Sdfr#include <sys/conf.h> 39178825Sdfr#include <sys/vnode.h> 40178825Sdfr#include <sys/queue.h> 41178825Sdfr#include <sys/poll.h> 42178825Sdfr#include <sys/ctype.h> 43233294Sstas#include <sys/tty.h> 44233294Sstas#include <sys/ucred.h> 45233294Sstas#include <machine/stdarg.h> 46233294Sstas 47178825Sdfr#include <fs/devfs/devfs_int.h> 48233294Sstas 49233294Sstasstatic MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 50233294Sstas 51233294Sstasstruct mtx devmtx; 52178825Sdfrstatic void destroy_devl(struct cdev *dev); 53178825Sdfrstatic struct cdev *make_dev_credv(struct cdevsw *devsw, int minornr, 54178825Sdfr struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 55178825Sdfr va_list ap); 56178825Sdfr 57178825Sdfrvoid 58178825Sdfrdev_lock(void) 59178825Sdfr{ 60178825Sdfr 61178825Sdfr mtx_lock(&devmtx); 62178825Sdfr} 63178825Sdfr 64178825Sdfrvoid 65178825Sdfrdev_unlock(void) 66178825Sdfr{ 67178825Sdfr 68178825Sdfr mtx_unlock(&devmtx); 69178825Sdfr} 70178825Sdfr 71178825Sdfrvoid 72178825Sdfrdev_ref(struct cdev *dev) 73178825Sdfr{ 74178825Sdfr 75178825Sdfr mtx_assert(&devmtx, MA_NOTOWNED); 76178825Sdfr mtx_lock(&devmtx); 77178825Sdfr dev->si_refcount++; 78178825Sdfr mtx_unlock(&devmtx); 79178825Sdfr} 80178825Sdfr 81178825Sdfrvoid 82178825Sdfrdev_refl(struct cdev *dev) 83178825Sdfr{ 84178825Sdfr 85178825Sdfr mtx_assert(&devmtx, MA_OWNED); 86178825Sdfr dev->si_refcount++; 87178825Sdfr} 88178825Sdfr 89178825Sdfrvoid 90178825Sdfrdev_rel(struct cdev *dev) 91178825Sdfr{ 92178825Sdfr int flag = 0; 93178825Sdfr 94178825Sdfr mtx_assert(&devmtx, MA_NOTOWNED); 95178825Sdfr dev_lock(); 96178825Sdfr dev->si_refcount--; 97178825Sdfr KASSERT(dev->si_refcount >= 0, 98178825Sdfr ("dev_rel(%s) gave negative count", devtoname(dev))); 99178825Sdfr#if 0 100178825Sdfr if (dev->si_usecount == 0 && 101178825Sdfr (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 102178825Sdfr ; 103178825Sdfr else 104178825Sdfr#endif 105178825Sdfr if (dev->si_devsw == NULL && dev->si_refcount == 0) { 106178825Sdfr LIST_REMOVE(dev, si_list); 107178825Sdfr flag = 1; 108178825Sdfr } 109178825Sdfr dev_unlock(); 110178825Sdfr if (flag) 111178825Sdfr devfs_free(dev); 112178825Sdfr} 113178825Sdfr 114178825Sdfrstruct cdevsw * 115178825Sdfrdev_refthread(struct cdev *dev) 116178825Sdfr{ 117178825Sdfr struct cdevsw *csw; 118178825Sdfr 119178825Sdfr mtx_assert(&devmtx, MA_NOTOWNED); 120178825Sdfr dev_lock(); 121178825Sdfr csw = dev->si_devsw; 122178825Sdfr if (csw != NULL) 123178825Sdfr dev->si_threadcount++; 124178825Sdfr dev_unlock(); 125178825Sdfr return (csw); 126178825Sdfr} 127178825Sdfr 128178825Sdfrvoid 129178825Sdfrdev_relthread(struct cdev *dev) 130178825Sdfr{ 131178825Sdfr 132178825Sdfr mtx_assert(&devmtx, MA_NOTOWNED); 133178825Sdfr dev_lock(); 134178825Sdfr dev->si_threadcount--; 135178825Sdfr dev_unlock(); 136178825Sdfr} 137178825Sdfr 138178825Sdfrint 139178825Sdfrnullop(void) 140233294Sstas{ 141178825Sdfr 142178825Sdfr return (0); 143233294Sstas} 144178825Sdfr 145233294Sstasint 146178825Sdfreopnotsupp(void) 147178825Sdfr{ 148178825Sdfr 149178825Sdfr return (EOPNOTSUPP); 150178825Sdfr} 151178825Sdfr 152178825Sdfrstatic int 153178825Sdfrenxio(void) 154178825Sdfr{ 155233294Sstas return (ENXIO); 156233294Sstas} 157233294Sstas 158178825Sdfrstatic int 159178825Sdfrenodev(void) 160178825Sdfr{ 161178825Sdfr return (ENODEV); 162178825Sdfr} 163178825Sdfr 164178825Sdfr/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 165178825Sdfr 166233294Sstas#define dead_open (d_open_t *)enxio 167178825Sdfr#define dead_close (d_close_t *)enxio 168178825Sdfr#define dead_read (d_read_t *)enxio 169178825Sdfr#define dead_write (d_write_t *)enxio 170178825Sdfr#define dead_ioctl (d_ioctl_t *)enxio 171178825Sdfr#define dead_poll (d_poll_t *)enodev 172178825Sdfr#define dead_mmap (d_mmap_t *)enodev 173178825Sdfr 174178825Sdfrstatic void 175178825Sdfrdead_strategy(struct bio *bp) 176178825Sdfr{ 177178825Sdfr 178178825Sdfr biofinish(bp, NULL, ENXIO); 179178825Sdfr} 180178825Sdfr 181178825Sdfr#define dead_dump (dumper_t *)enxio 182178825Sdfr#define dead_kqfilter (d_kqfilter_t *)enxio 183178825Sdfr 184178825Sdfrstatic struct cdevsw dead_cdevsw = { 185178825Sdfr .d_version = D_VERSION, 186178825Sdfr .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 187178825Sdfr .d_open = dead_open, 188178825Sdfr .d_close = dead_close, 189178825Sdfr .d_read = dead_read, 190178825Sdfr .d_write = dead_write, 191178825Sdfr .d_ioctl = dead_ioctl, 192178825Sdfr .d_poll = dead_poll, 193178825Sdfr .d_mmap = dead_mmap, 194178825Sdfr .d_strategy = dead_strategy, 195178825Sdfr .d_name = "dead", 196178825Sdfr .d_dump = dead_dump, 197178825Sdfr .d_kqfilter = dead_kqfilter 198178825Sdfr}; 199178825Sdfr 200178825Sdfr/* Default methods if driver does not specify method */ 201178825Sdfr 202178825Sdfr#define null_open (d_open_t *)nullop 203178825Sdfr#define null_close (d_close_t *)nullop 204178825Sdfr#define no_read (d_read_t *)enodev 205178825Sdfr#define no_write (d_write_t *)enodev 206178825Sdfr#define no_ioctl (d_ioctl_t *)enodev 207178825Sdfr#define no_mmap (d_mmap_t *)enodev 208178825Sdfr#define no_kqfilter (d_kqfilter_t *)enodev 209178825Sdfr 210178825Sdfrstatic void 211178825Sdfrno_strategy(struct bio *bp) 212178825Sdfr{ 213178825Sdfr 214178825Sdfr biofinish(bp, NULL, ENODEV); 215178825Sdfr} 216178825Sdfr 217178825Sdfrstatic int 218178825Sdfrno_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 219178825Sdfr{ 220178825Sdfr /* 221178825Sdfr * Return true for read/write. If the user asked for something 222178825Sdfr * special, return POLLNVAL, so that clients have a way of 223178825Sdfr * determining reliably whether or not the extended 224178825Sdfr * functionality is present without hard-coding knowledge 225178825Sdfr * of specific filesystem implementations. 226178825Sdfr * Stay in sync with vop_nopoll(). 227178825Sdfr */ 228178825Sdfr if (events & ~POLLSTANDARD) 229178825Sdfr return (POLLNVAL); 230178825Sdfr 231178825Sdfr return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 232178825Sdfr} 233178825Sdfr 234178825Sdfr#define no_dump (dumper_t *)enodev 235178825Sdfr 236178825Sdfrstatic int 237178825Sdfrgiant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 238178825Sdfr{ 239178825Sdfr int retval; 240178825Sdfr 241178825Sdfr mtx_lock(&Giant); 242178825Sdfr retval = dev->si_devsw->d_gianttrick-> 243178825Sdfr d_open(dev, oflags, devtype, td); 244178825Sdfr mtx_unlock(&Giant); 245178825Sdfr return (retval); 246178825Sdfr} 247178825Sdfr 248178825Sdfrstatic int 249178825Sdfrgiant_fdopen(struct cdev *dev, int oflags, struct thread *td, int fdidx) 250178825Sdfr{ 251178825Sdfr int retval; 252178825Sdfr 253178825Sdfr mtx_lock(&Giant); 254178825Sdfr retval = dev->si_devsw->d_gianttrick-> 255178825Sdfr d_fdopen(dev, oflags, td, fdidx); 256178825Sdfr mtx_unlock(&Giant); 257178825Sdfr return (retval); 258178825Sdfr} 259178825Sdfr 260178825Sdfrstatic int 261178825Sdfrgiant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 262178825Sdfr{ 263178825Sdfr int retval; 264178825Sdfr 265178825Sdfr mtx_lock(&Giant); 266178825Sdfr retval = dev->si_devsw->d_gianttrick-> 267178825Sdfr d_close(dev, fflag, devtype, td); 268178825Sdfr mtx_unlock(&Giant); 269178825Sdfr return (retval); 270178825Sdfr} 271178825Sdfr 272178825Sdfrstatic void 273178825Sdfrgiant_strategy(struct bio *bp) 274178825Sdfr{ 275178825Sdfr 276178825Sdfr mtx_lock(&Giant); 277178825Sdfr bp->bio_dev->si_devsw->d_gianttrick-> 278178825Sdfr d_strategy(bp); 279178825Sdfr mtx_unlock(&Giant); 280178825Sdfr} 281178825Sdfr 282178825Sdfrstatic int 283178825Sdfrgiant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 284178825Sdfr{ 285178825Sdfr int retval; 286178825Sdfr 287178825Sdfr mtx_lock(&Giant); 288178825Sdfr retval = dev->si_devsw->d_gianttrick-> 289178825Sdfr d_ioctl(dev, cmd, data, fflag, td); 290178825Sdfr mtx_unlock(&Giant); 291178825Sdfr return (retval); 292178825Sdfr} 293178825Sdfr 294178825Sdfrstatic int 295178825Sdfrgiant_read(struct cdev *dev, struct uio *uio, int ioflag) 296178825Sdfr{ 297178825Sdfr int retval; 298178825Sdfr 299178825Sdfr mtx_lock(&Giant); 300178825Sdfr retval = dev->si_devsw->d_gianttrick-> 301178825Sdfr d_read(dev, uio, ioflag); 302178825Sdfr mtx_unlock(&Giant); 303178825Sdfr return (retval); 304178825Sdfr} 305178825Sdfr 306178825Sdfrstatic int 307178825Sdfrgiant_write(struct cdev *dev, struct uio *uio, int ioflag) 308178825Sdfr{ 309233294Sstas int retval; 310178825Sdfr 311178825Sdfr mtx_lock(&Giant); 312233294Sstas retval = dev->si_devsw->d_gianttrick-> 313178825Sdfr d_write(dev, uio, ioflag); 314178825Sdfr mtx_unlock(&Giant); 315178825Sdfr return (retval); 316178825Sdfr} 317178825Sdfr 318178825Sdfrstatic int 319178825Sdfrgiant_poll(struct cdev *dev, int events, struct thread *td) 320178825Sdfr{ 321178825Sdfr int retval; 322178825Sdfr 323178825Sdfr mtx_lock(&Giant); 324178825Sdfr retval = dev->si_devsw->d_gianttrick-> 325178825Sdfr d_poll(dev, events, td); 326178825Sdfr mtx_unlock(&Giant); 327178825Sdfr return (retval); 328233294Sstas} 329178825Sdfr 330178825Sdfrstatic int 331178825Sdfrgiant_kqfilter(struct cdev *dev, struct knote *kn) 332178825Sdfr{ 333178825Sdfr int retval; 334178825Sdfr 335178825Sdfr mtx_lock(&Giant); 336233294Sstas retval = dev->si_devsw->d_gianttrick-> 337178825Sdfr d_kqfilter(dev, kn); 338178825Sdfr mtx_unlock(&Giant); 339178825Sdfr return (retval); 340178825Sdfr} 341178825Sdfr 342178825Sdfrstatic int 343178825Sdfrgiant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot) 344178825Sdfr{ 345178825Sdfr int retval; 346178825Sdfr 347178825Sdfr mtx_lock(&Giant); 348178825Sdfr retval = dev->si_devsw->d_gianttrick-> 349178825Sdfr d_mmap(dev, offset, paddr, nprot); 350178825Sdfr mtx_unlock(&Giant); 351178825Sdfr return (retval); 352178825Sdfr} 353178825Sdfr 354178825Sdfr 355178825Sdfr/* 356178825Sdfr * struct cdev * and u_dev_t primitives 357178825Sdfr */ 358178825Sdfr 359178825Sdfrint 360178825Sdfrminor(struct cdev *x) 361178825Sdfr{ 362178825Sdfr if (x == NULL) 363178825Sdfr return NODEV; 364178825Sdfr return(x->si_drv0 & MAXMINOR); 365178825Sdfr} 366178825Sdfr 367178825Sdfrint 368178825Sdfrdev2unit(struct cdev *x) 369178825Sdfr{ 370178825Sdfr 371178825Sdfr if (x == NULL) 372233294Sstas return NODEV; 373178825Sdfr return (minor2unit(minor(x))); 374178825Sdfr} 375178825Sdfr 376178825Sdfru_int 377178825Sdfrminor2unit(u_int _minor) 378233294Sstas{ 379233294Sstas 380178825Sdfr KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 381178825Sdfr return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00)); 382178825Sdfr} 383178825Sdfr 384178825Sdfrint 385178825Sdfrunit2minor(int unit) 386178825Sdfr{ 387178825Sdfr 388178825Sdfr KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 389178825Sdfr return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 390178825Sdfr} 391178825Sdfr 392178825Sdfrstatic struct cdev * 393178825Sdfrnewdev(struct cdevsw *csw, int y, struct cdev *si) 394178825Sdfr{ 395233294Sstas struct cdev *si2; 396233294Sstas dev_t udev; 397233294Sstas 398178825Sdfr mtx_assert(&devmtx, MA_OWNED); 399178825Sdfr udev = y; 400178825Sdfr LIST_FOREACH(si2, &csw->d_devs, si_list) { 401178825Sdfr if (si2->si_drv0 == udev) { 402178825Sdfr devfs_free(si); 403178825Sdfr return (si2); 404178825Sdfr } 405178825Sdfr } 406178825Sdfr si->si_drv0 = udev; 407178825Sdfr si->si_devsw = csw; 408178825Sdfr LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 409178825Sdfr return (si); 410178825Sdfr} 411178825Sdfr 412178825Sdfrint 413178825Sdfruminor(dev_t dev) 414178825Sdfr{ 415178825Sdfr return (dev & MAXMINOR); 416178825Sdfr} 417178825Sdfr 418178825Sdfrint 419178825Sdfrumajor(dev_t dev) 420178825Sdfr{ 421178825Sdfr return ((dev & ~MAXMINOR) >> 8); 422178825Sdfr} 423178825Sdfr 424233294Sstasstatic void 425178825Sdfrfini_cdevsw(struct cdevsw *devsw) 426178825Sdfr{ 427178825Sdfr struct cdevsw *gt; 428178825Sdfr 429178825Sdfr if (devsw->d_gianttrick != NULL) { 430178825Sdfr gt = devsw->d_gianttrick; 431178825Sdfr memcpy(devsw, gt, sizeof *devsw); 432178825Sdfr free(gt, M_DEVT); 433178825Sdfr devsw->d_gianttrick = NULL; 434178825Sdfr } 435178825Sdfr devsw->d_flags &= ~D_INIT; 436178825Sdfr} 437178825Sdfr 438178825Sdfrstatic void 439178825Sdfrprep_cdevsw(struct cdevsw *devsw) 440178825Sdfr{ 441178825Sdfr struct cdevsw *dsw2; 442178825Sdfr 443178825Sdfr if (devsw->d_flags & D_NEEDGIANT) 444178825Sdfr dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK); 445178825Sdfr else 446178825Sdfr dsw2 = NULL; 447178825Sdfr dev_lock(); 448178825Sdfr 449178825Sdfr if (devsw->d_version != D_VERSION_01) { 450178825Sdfr printf( 451178825Sdfr "WARNING: Device driver \"%s\" has wrong version %s\n", 452178825Sdfr devsw->d_name == NULL ? "???" : devsw->d_name, 453178825Sdfr "and is disabled. Recompile KLD module."); 454178825Sdfr devsw->d_open = dead_open; 455178825Sdfr devsw->d_close = dead_close; 456178825Sdfr devsw->d_read = dead_read; 457178825Sdfr devsw->d_write = dead_write; 458178825Sdfr devsw->d_ioctl = dead_ioctl; 459178825Sdfr devsw->d_poll = dead_poll; 460178825Sdfr devsw->d_mmap = dead_mmap; 461178825Sdfr devsw->d_strategy = dead_strategy; 462178825Sdfr devsw->d_dump = dead_dump; 463178825Sdfr devsw->d_kqfilter = dead_kqfilter; 464178825Sdfr } 465178825Sdfr 466178825Sdfr if (devsw->d_flags & D_TTY) { 467178825Sdfr if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 468178825Sdfr if (devsw->d_read == NULL) devsw->d_read = ttyread; 469178825Sdfr if (devsw->d_write == NULL) devsw->d_write = ttywrite; 470178825Sdfr if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 471178825Sdfr if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 472178825Sdfr } 473178825Sdfr 474178825Sdfr if (devsw->d_flags & D_NEEDGIANT) { 475178825Sdfr if (devsw->d_gianttrick == NULL) { 476178825Sdfr memcpy(dsw2, devsw, sizeof *dsw2); 477178825Sdfr devsw->d_gianttrick = dsw2; 478178825Sdfr } else 479178825Sdfr free(dsw2, M_DEVT); 480178825Sdfr } 481178825Sdfr 482178825Sdfr#define FIXUP(member, noop, giant) \ 483178825Sdfr do { \ 484178825Sdfr if (devsw->member == NULL) { \ 485178825Sdfr devsw->member = noop; \ 486178825Sdfr } else if (devsw->d_flags & D_NEEDGIANT) \ 487178825Sdfr devsw->member = giant; \ 488178825Sdfr } \ 489178825Sdfr while (0) 490178825Sdfr 491178825Sdfr FIXUP(d_open, null_open, giant_open); 492178825Sdfr FIXUP(d_fdopen, NULL, giant_fdopen); 493178825Sdfr FIXUP(d_close, null_close, giant_close); 494178825Sdfr FIXUP(d_read, no_read, giant_read); 495178825Sdfr FIXUP(d_write, no_write, giant_write); 496178825Sdfr FIXUP(d_ioctl, no_ioctl, giant_ioctl); 497178825Sdfr FIXUP(d_poll, no_poll, giant_poll); 498178825Sdfr FIXUP(d_mmap, no_mmap, giant_mmap); 499178825Sdfr FIXUP(d_strategy, no_strategy, giant_strategy); 500178825Sdfr FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 501178825Sdfr 502178825Sdfr if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 503178825Sdfr 504178825Sdfr LIST_INIT(&devsw->d_devs); 505178825Sdfr 506178825Sdfr devsw->d_flags |= D_INIT; 507178825Sdfr 508178825Sdfr dev_unlock(); 509178825Sdfr} 510178825Sdfr 511178825Sdfrstatic struct cdev * 512178825Sdfrmake_dev_credv(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 513178825Sdfr gid_t gid, int mode, const char *fmt, va_list ap) 514178825Sdfr{ 515178825Sdfr struct cdev *dev; 516178825Sdfr int i; 517178825Sdfr 518178825Sdfr KASSERT((minornr & ~MAXMINOR) == 0, 519178825Sdfr ("Invalid minor (0x%x) in make_dev", minornr)); 520178825Sdfr 521178825Sdfr if (!(devsw->d_flags & D_INIT)) 522178825Sdfr prep_cdevsw(devsw); 523178825Sdfr dev = devfs_alloc(); 524233294Sstas dev_lock(); 525233294Sstas dev = newdev(devsw, minornr, dev); 526178825Sdfr if (dev->si_flags & SI_CHEAPCLONE && 527178825Sdfr dev->si_flags & SI_NAMED) { 528178825Sdfr /* 529178825Sdfr * This is allowed as it removes races and generally 530178825Sdfr * simplifies cloning devices. 531178825Sdfr * XXX: still ?? 532178825Sdfr */ 533178825Sdfr dev_unlock(); 534178825Sdfr return (dev); 535178825Sdfr } 536178825Sdfr KASSERT(!(dev->si_flags & SI_NAMED), 537178825Sdfr ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 538178825Sdfr devsw->d_name, minor(dev), devtoname(dev))); 539178825Sdfr 540178825Sdfr i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 541178825Sdfr if (i > (sizeof dev->__si_namebuf - 1)) { 542178825Sdfr printf("WARNING: Device name truncated! (%s)\n", 543178825Sdfr dev->__si_namebuf); 544178825Sdfr } 545178825Sdfr 546178825Sdfr dev->si_flags |= SI_NAMED; 547178825Sdfr if (cr != NULL) 548178825Sdfr dev->si_cred = crhold(cr); 549178825Sdfr else 550178825Sdfr dev->si_cred = NULL; 551178825Sdfr dev->si_uid = uid; 552178825Sdfr dev->si_gid = gid; 553178825Sdfr dev->si_mode = mode; 554178825Sdfr 555178825Sdfr devfs_create(dev); 556178825Sdfr dev_unlock(); 557178825Sdfr return (dev); 558178825Sdfr} 559178825Sdfr 560178825Sdfrstruct cdev * 561233294Sstasmake_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode, 562233294Sstas const char *fmt, ...) 563178825Sdfr{ 564178825Sdfr struct cdev *dev; 565178825Sdfr va_list ap; 566178825Sdfr 567178825Sdfr va_start(ap, fmt); 568178825Sdfr dev = make_dev_credv(devsw, minornr, NULL, uid, gid, mode, fmt, ap); 569178825Sdfr va_end(ap); 570178825Sdfr return (dev); 571178825Sdfr} 572178825Sdfr 573178825Sdfrstruct cdev * 574178825Sdfrmake_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 575178825Sdfr gid_t gid, int mode, const char *fmt, ...) 576178825Sdfr{ 577178825Sdfr struct cdev *dev; 578178825Sdfr va_list ap; 579178825Sdfr 580178825Sdfr va_start(ap, fmt); 581178825Sdfr dev = make_dev_credv(devsw, minornr, cr, uid, gid, mode, fmt, ap); 582178825Sdfr va_end(ap); 583178825Sdfr 584178825Sdfr return (dev); 585178825Sdfr} 586178825Sdfr 587178825Sdfrstatic void 588178825Sdfrdev_dependsl(struct cdev *pdev, struct cdev *cdev) 589178825Sdfr{ 590178825Sdfr 591178825Sdfr cdev->si_parent = pdev; 592178825Sdfr cdev->si_flags |= SI_CHILD; 593178825Sdfr LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 594178825Sdfr} 595178825Sdfr 596178825Sdfr 597178825Sdfrvoid 598178825Sdfrdev_depends(struct cdev *pdev, struct cdev *cdev) 599178825Sdfr{ 600178825Sdfr 601178825Sdfr dev_lock(); 602178825Sdfr dev_dependsl(pdev, cdev); 603178825Sdfr dev_unlock(); 604178825Sdfr} 605178825Sdfr 606178825Sdfrstruct cdev * 607178825Sdfrmake_dev_alias(struct cdev *pdev, const char *fmt, ...) 608178825Sdfr{ 609178825Sdfr struct cdev *dev; 610178825Sdfr va_list ap; 611178825Sdfr int i; 612178825Sdfr 613178825Sdfr dev = devfs_alloc(); 614178825Sdfr dev_lock(); 615178825Sdfr dev->si_flags |= SI_ALIAS; 616178825Sdfr dev->si_flags |= SI_NAMED; 617178825Sdfr va_start(ap, fmt); 618178825Sdfr i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 619178825Sdfr if (i > (sizeof dev->__si_namebuf - 1)) { 620178825Sdfr printf("WARNING: Device name truncated! (%s)\n", 621178825Sdfr dev->__si_namebuf); 622178825Sdfr } 623178825Sdfr va_end(ap); 624178825Sdfr 625178825Sdfr devfs_create(dev); 626178825Sdfr dev_unlock(); 627178825Sdfr dev_depends(pdev, dev); 628178825Sdfr return (dev); 629178825Sdfr} 630178825Sdfr 631178825Sdfrstatic void 632178825Sdfrdestroy_devl(struct cdev *dev) 633233294Sstas{ 634178825Sdfr struct cdevsw *csw; 635178825Sdfr 636178825Sdfr mtx_assert(&devmtx, MA_OWNED); 637178825Sdfr KASSERT(dev->si_flags & SI_NAMED, 638178825Sdfr ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev))); 639178825Sdfr 640178825Sdfr devfs_destroy(dev); 641178825Sdfr 642178825Sdfr /* Remove name marking */ 643178825Sdfr dev->si_flags &= ~SI_NAMED; 644178825Sdfr 645178825Sdfr /* If we are a child, remove us from the parents list */ 646178825Sdfr if (dev->si_flags & SI_CHILD) { 647178825Sdfr LIST_REMOVE(dev, si_siblings); 648178825Sdfr dev->si_flags &= ~SI_CHILD; 649178825Sdfr } 650178825Sdfr 651178825Sdfr /* Kill our children */ 652178825Sdfr while (!LIST_EMPTY(&dev->si_children)) 653178825Sdfr destroy_devl(LIST_FIRST(&dev->si_children)); 654178825Sdfr 655178825Sdfr /* Remove from clone list */ 656178825Sdfr if (dev->si_flags & SI_CLONELIST) { 657178825Sdfr LIST_REMOVE(dev, si_clone); 658178825Sdfr dev->si_flags &= ~SI_CLONELIST; 659178825Sdfr } 660178825Sdfr 661178825Sdfr csw = dev->si_devsw; 662178825Sdfr dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 663178825Sdfr while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 664178825Sdfr csw->d_purge(dev); 665178825Sdfr msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 666178825Sdfr if (dev->si_threadcount) 667178825Sdfr printf("Still %lu threads in %s\n", 668178825Sdfr dev->si_threadcount, devtoname(dev)); 669178825Sdfr } 670178825Sdfr 671178825Sdfr dev->si_drv1 = 0; 672178825Sdfr dev->si_drv2 = 0; 673178825Sdfr bzero(&dev->__si_u, sizeof(dev->__si_u)); 674178825Sdfr 675178825Sdfr if (!(dev->si_flags & SI_ALIAS)) { 676178825Sdfr /* Remove from cdevsw list */ 677178825Sdfr LIST_REMOVE(dev, si_list); 678178825Sdfr 679178825Sdfr /* If cdevsw has no more struct cdev *'s, clean it */ 680178825Sdfr if (LIST_EMPTY(&csw->d_devs)) 681178825Sdfr fini_cdevsw(csw); 682178825Sdfr } 683178825Sdfr dev->si_flags &= ~SI_ALIAS; 684178825Sdfr 685178825Sdfr if (dev->si_refcount > 0) { 686178825Sdfr LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 687178825Sdfr } else { 688178825Sdfr devfs_free(dev); 689178825Sdfr } 690178825Sdfr} 691178825Sdfr 692178825Sdfrvoid 693178825Sdfrdestroy_dev(struct cdev *dev) 694178825Sdfr{ 695178825Sdfr 696178825Sdfr dev_lock(); 697178825Sdfr destroy_devl(dev); 698178825Sdfr dev_unlock(); 699178825Sdfr} 700178825Sdfr 701233294Sstasconst char * 702233294Sstasdevtoname(struct cdev *dev) 703233294Sstas{ 704233294Sstas char *p; 705233294Sstas struct cdevsw *csw; 706178825Sdfr int mynor; 707178825Sdfr 708178825Sdfr if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 709178825Sdfr p = dev->si_name; 710178825Sdfr csw = dev_refthread(dev); 711233294Sstas if (csw != NULL) { 712178825Sdfr sprintf(p, "(%s)", csw->d_name); 713178825Sdfr dev_relthread(dev); 714178825Sdfr } 715178825Sdfr p += strlen(p); 716178825Sdfr mynor = minor(dev); 717178825Sdfr if (mynor < 0 || mynor > 255) 718178825Sdfr sprintf(p, "/%#x", (u_int)mynor); 719233294Sstas else 720178825Sdfr sprintf(p, "/%d", mynor); 721178825Sdfr } 722178825Sdfr return (dev->si_name); 723233294Sstas} 724178825Sdfr 725178825Sdfrint 726178825Sdfrdev_stdclone(char *name, char **namep, const char *stem, int *unit) 727178825Sdfr{ 728178825Sdfr int u, i; 729178825Sdfr 730233294Sstas i = strlen(stem); 731178825Sdfr if (bcmp(stem, name, i) != 0) 732178825Sdfr return (0); 733233294Sstas if (!isdigit(name[i])) 734178825Sdfr return (0); 735178825Sdfr u = 0; 736178825Sdfr if (name[i] == '0' && isdigit(name[i+1])) 737178825Sdfr return (0); 738178825Sdfr while (isdigit(name[i])) { 739178825Sdfr u *= 10; 740178825Sdfr u += name[i++] - '0'; 741178825Sdfr } 742178825Sdfr if (u > 0xffffff) 743178825Sdfr return (0); 744178825Sdfr *unit = u; 745178825Sdfr if (namep) 746178825Sdfr *namep = &name[i]; 747178825Sdfr if (name[i]) 748178825Sdfr return (2); 749178825Sdfr return (1); 750233294Sstas} 751178825Sdfr 752233294Sstas/* 753178825Sdfr * Helper functions for cloning device drivers. 754178825Sdfr * 755178825Sdfr * The objective here is to make it unnecessary for the device drivers to 756178825Sdfr * use rman or similar to manage their unit number space. Due to the way 757178825Sdfr * we do "on-demand" devices, using rman or other "private" methods 758178825Sdfr * will be very tricky to lock down properly once we lock down this file. 759178825Sdfr * 760178825Sdfr * Instead we give the drivers these routines which puts the struct cdev *'s 761178825Sdfr * that are to be managed on their own list, and gives the driver the ability 762178825Sdfr * to ask for the first free unit number or a given specified unit number. 763178825Sdfr * 764178825Sdfr * In addition these routines support paired devices (pty, nmdm and similar) 765178825Sdfr * by respecting a number of "flag" bits in the minor number. 766178825Sdfr * 767178825Sdfr */ 768178825Sdfr 769178825Sdfrstruct clonedevs { 770233294Sstas LIST_HEAD(,cdev) head; 771178825Sdfr}; 772233294Sstas 773233294Sstasvoid 774233294Sstasclone_setup(struct clonedevs **cdp) 775178825Sdfr{ 776178825Sdfr 777233294Sstas *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 778178825Sdfr LIST_INIT(&(*cdp)->head); 779178825Sdfr} 780178825Sdfr 781178825Sdfrint 782178825Sdfrclone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 783178825Sdfr{ 784178825Sdfr struct clonedevs *cd; 785178825Sdfr struct cdev *dev, *ndev, *dl, *de; 786178825Sdfr int unit, low, u; 787178825Sdfr 788178825Sdfr KASSERT(*cdp != NULL, 789178825Sdfr ("clone_setup() not called in driver \"%s\"", csw->d_name)); 790178825Sdfr KASSERT(!(extra & CLONE_UNITMASK), 791178825Sdfr ("Illegal extra bits (0x%x) in clone_create", extra)); 792178825Sdfr KASSERT(*up <= CLONE_UNITMASK, 793178825Sdfr ("Too high unit (0x%x) in clone_create", *up)); 794178825Sdfr 795178825Sdfr if (!(csw->d_flags & D_INIT)) 796178825Sdfr prep_cdevsw(csw); 797178825Sdfr 798178825Sdfr /* 799178825Sdfr * Search the list for a lot of things in one go: 800178825Sdfr * A preexisting match is returned immediately. 801178825Sdfr * The lowest free unit number if we are passed -1, and the place 802178825Sdfr * in the list where we should insert that new element. 803178825Sdfr * The place to insert a specified unit number, if applicable 804178825Sdfr * the end of the list. 805178825Sdfr */ 806178825Sdfr unit = *up; 807178825Sdfr ndev = devfs_alloc(); 808178825Sdfr dev_lock(); 809178825Sdfr low = extra; 810178825Sdfr de = dl = NULL; 811233294Sstas cd = *cdp; 812233294Sstas LIST_FOREACH(dev, &cd->head, si_clone) { 813233294Sstas KASSERT(dev->si_flags & SI_CLONELIST, 814233294Sstas ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 815233294Sstas u = dev2unit(dev); 816233294Sstas if (u == (unit | extra)) { 817233294Sstas *dp = dev; 818233294Sstas devfs_free(ndev); 819233294Sstas dev_unlock(); 820233294Sstas return (0); 821233294Sstas } 822233294Sstas if (unit == -1 && u == low) { 823233294Sstas low++; 824233294Sstas de = dev; 825233294Sstas continue; 826233294Sstas } else if (u < (unit | extra)) { 827233294Sstas de = dev; 828233294Sstas continue; 829233294Sstas } else if (u > (unit | extra)) { 830233294Sstas dl = dev; 831233294Sstas break; 832233294Sstas } 833233294Sstas } 834233294Sstas if (unit == -1) 835233294Sstas unit = low & CLONE_UNITMASK; 836233294Sstas dev = newdev(csw, unit2minor(unit | extra), ndev); 837233294Sstas if (dev->si_flags & SI_CLONELIST) { 838233294Sstas printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 839233294Sstas printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 840233294Sstas LIST_FOREACH(dev, &cd->head, si_clone) { 841233294Sstas printf("\t%p %s\n", dev, dev->si_name); 842233294Sstas } 843233294Sstas panic("foo"); 844233294Sstas } 845233294Sstas KASSERT(!(dev->si_flags & SI_CLONELIST), 846233294Sstas ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 847233294Sstas if (dl != NULL) 848233294Sstas LIST_INSERT_BEFORE(dl, dev, si_clone); 849233294Sstas else if (de != NULL) 850233294Sstas LIST_INSERT_AFTER(de, dev, si_clone); 851233294Sstas else 852233294Sstas LIST_INSERT_HEAD(&cd->head, dev, si_clone); 853233294Sstas dev->si_flags |= SI_CLONELIST; 854233294Sstas *up = unit; 855233294Sstas dev_unlock(); 856233294Sstas return (1); 857233294Sstas} 858233294Sstas 859178825Sdfr/* 860178825Sdfr * Kill everything still on the list. The driver should already have 861178825Sdfr * disposed of any softc hung of the struct cdev *'s at this time. 862178825Sdfr */ 863233294Sstasvoid 864178825Sdfrclone_cleanup(struct clonedevs **cdp) 865178825Sdfr{ 866178825Sdfr struct cdev *dev, *tdev; 867178825Sdfr struct clonedevs *cd; 868178825Sdfr 869178825Sdfr cd = *cdp; 870178825Sdfr if (cd == NULL) 871233294Sstas return; 872178825Sdfr dev_lock(); 873178825Sdfr LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 874178825Sdfr KASSERT(dev->si_flags & SI_CLONELIST, 875178825Sdfr ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 876178825Sdfr KASSERT(dev->si_flags & SI_NAMED, 877178825Sdfr ("Driver has goofed in cloning underways udev %x", dev->si_drv0)); 878178825Sdfr destroy_devl(dev); 879178825Sdfr } 880178825Sdfr dev_unlock(); 881178825Sdfr free(cd, M_DEVBUF); 882178825Sdfr *cdp = NULL; 883178825Sdfr} 884178825Sdfr