kern_conf.c revision 154029
155714Skris/*- 255714Skris * Copyright (c) 1999-2002 Poul-Henning Kamp 355714Skris * All rights reserved. 455714Skris * 555714Skris * Redistribution and use in source and binary forms, with or without 655714Skris * modification, are permitted provided that the following conditions 755714Skris * are met: 8296465Sdelphij * 1. Redistributions of source code must retain the above copyright 955714Skris * notice, this list of conditions and the following disclaimer. 1055714Skris * 2. Redistributions in binary form must reproduce the above copyright 1155714Skris * notice, this list of conditions and the following disclaimer in the 1255714Skris * documentation and/or other materials provided with the distribution. 1355714Skris * 1455714Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15296465Sdelphij * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1655714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1755714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1855714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1955714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2055714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2155714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22296465Sdelphij * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2355714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2455714Skris * SUCH DAMAGE. 2555714Skris */ 2655714Skris 2755714Skris#include <sys/cdefs.h> 2855714Skris__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 154029 2006-01-04 17:40:54Z bz $"); 2955714Skris 3055714Skris#include <sys/param.h> 3155714Skris#include <sys/kernel.h> 3255714Skris#include <sys/systm.h> 3355714Skris#include <sys/bio.h> 3455714Skris#include <sys/lock.h> 3555714Skris#include <sys/mutex.h> 3655714Skris#include <sys/module.h> 37296465Sdelphij#include <sys/malloc.h> 3855714Skris#include <sys/conf.h> 3955714Skris#include <sys/vnode.h> 40296465Sdelphij#include <sys/queue.h> 4155714Skris#include <sys/poll.h> 4255714Skris#include <sys/ctype.h> 4355714Skris#include <sys/tty.h> 4455714Skris#include <sys/ucred.h> 4555714Skris#include <machine/stdarg.h> 4655714Skris 4755714Skris#include <fs/devfs/devfs_int.h> 4855714Skris 4955714Skrisstatic MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 5055714Skris 5155714Skrisstruct mtx devmtx; 52296465Sdelphijstatic void destroy_devl(struct cdev *dev); 5355714Skrisstatic struct cdev *make_dev_credv(struct cdevsw *devsw, int minornr, 5455714Skris struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 5555714Skris va_list ap); 5655714Skris 5755714Skrisvoid 5855714Skrisdev_lock(void) 5955714Skris{ 60296465Sdelphij 61296465Sdelphij mtx_lock(&devmtx); 62296465Sdelphij} 63296465Sdelphij 64296465Sdelphijvoid 6555714Skrisdev_unlock(void) 6655714Skris{ 6755714Skris 68296465Sdelphij mtx_unlock(&devmtx); 6955714Skris} 70296465Sdelphij 71296465Sdelphijvoid 72296465Sdelphijdev_ref(struct cdev *dev) 73296465Sdelphij{ 74296465Sdelphij 75296465Sdelphij mtx_assert(&devmtx, MA_NOTOWNED); 76296465Sdelphij mtx_lock(&devmtx); 7768651Skris dev->si_refcount++; 7855714Skris mtx_unlock(&devmtx); 7955714Skris} 8055714Skris 8155714Skrisvoid 8255714Skrisdev_refl(struct cdev *dev) 83296465Sdelphij{ 84296465Sdelphij 85296465Sdelphij mtx_assert(&devmtx, MA_OWNED); 86296465Sdelphij dev->si_refcount++; 87296465Sdelphij} 88296465Sdelphij 8955714Skrisvoid 90296465Sdelphijdev_rel(struct cdev *dev) 91296465Sdelphij{ 92296465Sdelphij int flag = 0; 93296465Sdelphij 94296465Sdelphij mtx_assert(&devmtx, MA_NOTOWNED); 95296465Sdelphij dev_lock(); 9655714Skris dev->si_refcount--; 9755714Skris KASSERT(dev->si_refcount >= 0, 98296465Sdelphij ("dev_rel(%s) gave negative count", devtoname(dev))); 99296465Sdelphij#if 0 100296465Sdelphij if (dev->si_usecount == 0 && 101296465Sdelphij (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 102296465Sdelphij ; 103296465Sdelphij else 10455714Skris#endif 105296465Sdelphij if (dev->si_devsw == NULL && dev->si_refcount == 0) { 106296465Sdelphij LIST_REMOVE(dev, si_list); 107296465Sdelphij flag = 1; 10855714Skris } 10955714Skris dev_unlock(); 11055714Skris if (flag) 11155714Skris devfs_free(dev); 11255714Skris} 11355714Skris 11455714Skrisstruct cdevsw * 115296465Sdelphijdev_refthread(struct cdev *dev) 116296465Sdelphij{ 117296465Sdelphij struct cdevsw *csw; 118296465Sdelphij 119296465Sdelphij mtx_assert(&devmtx, MA_NOTOWNED); 12055714Skris dev_lock(); 121296465Sdelphij csw = dev->si_devsw; 122296465Sdelphij if (csw != NULL) 123296465Sdelphij dev->si_threadcount++; 124296465Sdelphij dev_unlock(); 125296465Sdelphij return (csw); 126296465Sdelphij} 127296465Sdelphij 128296465Sdelphijvoid 129296465Sdelphijdev_relthread(struct cdev *dev) 130296465Sdelphij{ 13155714Skris 13255714Skris mtx_assert(&devmtx, MA_NOTOWNED); 13355714Skris dev_lock(); 13455714Skris dev->si_threadcount--; 13568651Skris dev_unlock(); 13655714Skris} 13755714Skris 138296465Sdelphijint 139296465Sdelphijnullop(void) 140296465Sdelphij{ 141296465Sdelphij 142296465Sdelphij return (0); 143296465Sdelphij} 144296465Sdelphij 145296465Sdelphijint 146296465Sdelphijeopnotsupp(void) 147296465Sdelphij{ 148296465Sdelphij 149296465Sdelphij return (EOPNOTSUPP); 150296465Sdelphij} 151296465Sdelphij 152296465Sdelphijstatic int 153296465Sdelphijenxio(void) 154296465Sdelphij{ 155296465Sdelphij return (ENXIO); 15655714Skris} 157296465Sdelphij 158296465Sdelphijstatic int 159296465Sdelphijenodev(void) 160160814Ssimon{ 161160814Ssimon return (ENODEV); 162160814Ssimon} 163296465Sdelphij 164296465Sdelphij/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 165296465Sdelphij 166296465Sdelphij#define dead_open (d_open_t *)enxio 167296465Sdelphij#define dead_close (d_close_t *)enxio 168296465Sdelphij#define dead_read (d_read_t *)enxio 169296465Sdelphij#define dead_write (d_write_t *)enxio 170296465Sdelphij#define dead_ioctl (d_ioctl_t *)enxio 171296465Sdelphij#define dead_poll (d_poll_t *)enodev 172296465Sdelphij#define dead_mmap (d_mmap_t *)enodev 173160814Ssimon 174160814Ssimonstatic void 175160814Ssimondead_strategy(struct bio *bp) 176296465Sdelphij{ 177296465Sdelphij 178296465Sdelphij biofinish(bp, NULL, ENXIO); 179296465Sdelphij} 180296465Sdelphij 181296465Sdelphij#define dead_dump (dumper_t *)enxio 182296465Sdelphij#define dead_kqfilter (d_kqfilter_t *)enxio 183296465Sdelphij 184296465Sdelphijstatic struct cdevsw dead_cdevsw = { 185296465Sdelphij .d_version = D_VERSION, 186296465Sdelphij .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 187296465Sdelphij .d_open = dead_open, 188296465Sdelphij .d_close = dead_close, 189296465Sdelphij .d_read = dead_read, 190296465Sdelphij .d_write = dead_write, 191296465Sdelphij .d_ioctl = dead_ioctl, 192296465Sdelphij .d_poll = dead_poll, 193296465Sdelphij .d_mmap = dead_mmap, 194296465Sdelphij .d_strategy = dead_strategy, 195296465Sdelphij .d_name = "dead", 196296465Sdelphij .d_dump = dead_dump, 197296465Sdelphij .d_kqfilter = dead_kqfilter 198296465Sdelphij}; 199296465Sdelphij 200296465Sdelphij/* Default methods if driver does not specify method */ 201296465Sdelphij 202296465Sdelphij#define null_open (d_open_t *)nullop 203296465Sdelphij#define null_close (d_close_t *)nullop 204296465Sdelphij#define no_read (d_read_t *)enodev 205296465Sdelphij#define no_write (d_write_t *)enodev 206296465Sdelphij#define no_ioctl (d_ioctl_t *)enodev 207296465Sdelphij#define no_mmap (d_mmap_t *)enodev 208296465Sdelphij#define no_kqfilter (d_kqfilter_t *)enodev 20955714Skris 210160814Ssimonstatic void 21155714Skrisno_strategy(struct bio *bp) 212296465Sdelphij{ 213296465Sdelphij 21455714Skris biofinish(bp, NULL, ENODEV); 21555714Skris} 216296465Sdelphij 217296465Sdelphijstatic int 218296465Sdelphijno_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 219296465Sdelphij{ 220296465Sdelphij /* 221296465Sdelphij * Return true for read/write. If the user asked for something 222296465Sdelphij * special, return POLLNVAL, so that clients have a way of 22355714Skris * determining reliably whether or not the extended 224296465Sdelphij * functionality is present without hard-coding knowledge 225296465Sdelphij * of specific filesystem implementations. 226296465Sdelphij * Stay in sync with vop_nopoll(). 227296465Sdelphij */ 228296465Sdelphij if (events & ~POLLSTANDARD) 229296465Sdelphij return (POLLNVAL); 230296465Sdelphij 231296465Sdelphij return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 232296465Sdelphij} 233296465Sdelphij 234296465Sdelphij#define no_dump (dumper_t *)enodev 235296465Sdelphij 236296465Sdelphijstatic int 237296465Sdelphijgiant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 238296465Sdelphij{ 239296465Sdelphij int retval; 240296465Sdelphij 241296465Sdelphij mtx_lock(&Giant); 242296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 243296465Sdelphij d_open(dev, oflags, devtype, td); 244296465Sdelphij mtx_unlock(&Giant); 245296465Sdelphij return (retval); 246296465Sdelphij} 247296465Sdelphij 248296465Sdelphijstatic int 249296465Sdelphijgiant_fdopen(struct cdev *dev, int oflags, struct thread *td, int fdidx) 250296465Sdelphij{ 251296465Sdelphij int retval; 252296465Sdelphij 253296465Sdelphij mtx_lock(&Giant); 254296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 255296465Sdelphij d_fdopen(dev, oflags, td, fdidx); 256296465Sdelphij mtx_unlock(&Giant); 257296465Sdelphij return (retval); 258296465Sdelphij} 259296465Sdelphij 260296465Sdelphijstatic int 261296465Sdelphijgiant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 262296465Sdelphij{ 263296465Sdelphij int retval; 264296465Sdelphij 265296465Sdelphij mtx_lock(&Giant); 266296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 267296465Sdelphij d_close(dev, fflag, devtype, td); 268296465Sdelphij mtx_unlock(&Giant); 269296465Sdelphij return (retval); 270296465Sdelphij} 271296465Sdelphij 272296465Sdelphijstatic void 273296465Sdelphijgiant_strategy(struct bio *bp) 274296465Sdelphij{ 275296465Sdelphij 276296465Sdelphij mtx_lock(&Giant); 277296465Sdelphij bp->bio_dev->si_devsw->d_gianttrick-> 278296465Sdelphij d_strategy(bp); 279296465Sdelphij mtx_unlock(&Giant); 280296465Sdelphij} 281296465Sdelphij 282296465Sdelphijstatic int 28355714Skrisgiant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 284160814Ssimon{ 28555714Skris int retval; 286296465Sdelphij 287296465Sdelphij mtx_lock(&Giant); 288296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 289296465Sdelphij d_ioctl(dev, cmd, data, fflag, td); 29055714Skris mtx_unlock(&Giant); 291296465Sdelphij return (retval); 292296465Sdelphij} 29355714Skris 294296465Sdelphijstatic int 295296465Sdelphijgiant_read(struct cdev *dev, struct uio *uio, int ioflag) 29655714Skris{ 297296465Sdelphij int retval; 298296465Sdelphij 29955714Skris mtx_lock(&Giant); 300296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 30159191Skris d_read(dev, uio, ioflag); 30255714Skris mtx_unlock(&Giant); 303296465Sdelphij return (retval); 304296465Sdelphij} 305296465Sdelphij 306296465Sdelphijstatic int 307296465Sdelphijgiant_write(struct cdev *dev, struct uio *uio, int ioflag) 308296465Sdelphij{ 309296465Sdelphij int retval; 310296465Sdelphij 311296465Sdelphij mtx_lock(&Giant); 312296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 313296465Sdelphij d_write(dev, uio, ioflag); 314296465Sdelphij mtx_unlock(&Giant); 315296465Sdelphij return (retval); 316296465Sdelphij} 317296465Sdelphij 318296465Sdelphijstatic int 319296465Sdelphijgiant_poll(struct cdev *dev, int events, struct thread *td) 320296465Sdelphij{ 321296465Sdelphij int retval; 322296465Sdelphij 323296465Sdelphij mtx_lock(&Giant); 324296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 325296465Sdelphij d_poll(dev, events, td); 326296465Sdelphij mtx_unlock(&Giant); 327296465Sdelphij return (retval); 328296465Sdelphij} 329296465Sdelphij 33068651Skrisstatic int 331296465Sdelphijgiant_kqfilter(struct cdev *dev, struct knote *kn) 332296465Sdelphij{ 333296465Sdelphij int retval; 334296465Sdelphij 33555714Skris mtx_lock(&Giant); 336296465Sdelphij retval = dev->si_devsw->d_gianttrick-> 337296465Sdelphij d_kqfilter(dev, kn); 338296465Sdelphij mtx_unlock(&Giant); 339296465Sdelphij return (retval); 340296465Sdelphij} 341296465Sdelphij 342296465Sdelphijstatic int 343296465Sdelphijgiant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot) 344109998Smarkm{ 345296465Sdelphij int retval; 346296465Sdelphij 347296465Sdelphij mtx_lock(&Giant); 348160814Ssimon retval = dev->si_devsw->d_gianttrick-> 349296465Sdelphij d_mmap(dev, offset, paddr, nprot); 350160814Ssimon mtx_unlock(&Giant); 35155714Skris return (retval); 352296465Sdelphij} 35355714Skris 35468651Skris 35568651Skris/* 356127128Snectar * struct cdev * and u_dev_t primitives 357296465Sdelphij */ 358127128Snectar 359296465Sdelphijint 360127128Snectarminor(struct cdev *x) 361296465Sdelphij{ 362127128Snectar if (x == NULL) 363296465Sdelphij return NODEV; 364127128Snectar return(x->si_drv0 & MAXMINOR); 365296465Sdelphij} 366127128Snectar 367296465Sdelphijint 368160814Ssimondev2unit(struct cdev *x) 369296465Sdelphij{ 370160814Ssimon 371296465Sdelphij if (x == NULL) 372160814Ssimon return NODEV; 373296465Sdelphij return (minor2unit(minor(x))); 374160814Ssimon} 375296465Sdelphij 376160814Ssimonu_int 377296465Sdelphijminor2unit(u_int _minor) 378160814Ssimon{ 379296465Sdelphij 38068651Skris KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 381205128Ssimon return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00)); 382296465Sdelphij} 383205128Ssimon 384296465Sdelphijint 385296465Sdelphijunit2minor(int unit) 386296465Sdelphij{ 387296465Sdelphij 388296465Sdelphij KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 389160814Ssimon return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 390160814Ssimon} 391296465Sdelphij 392296465Sdelphijstatic struct cdev * 393296465Sdelphijnewdev(struct cdevsw *csw, int y, struct cdev *si) 394296465Sdelphij{ 395160814Ssimon struct cdev *si2; 39668651Skris dev_t udev; 397296465Sdelphij 398296465Sdelphij mtx_assert(&devmtx, MA_OWNED); 399296465Sdelphij udev = y; 400296465Sdelphij LIST_FOREACH(si2, &csw->d_devs, si_list) { 401296465Sdelphij if (si2->si_drv0 == udev) { 40255714Skris devfs_free(si); 40355714Skris return (si2); 404296465Sdelphij } 40555714Skris } 40655714Skris si->si_drv0 = udev; 407160814Ssimon si->si_devsw = csw; 408109998Smarkm LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 409109998Smarkm return (si); 410160814Ssimon} 411109998Smarkm 41259191Skrisint 41368651Skrisuminor(dev_t dev) 41468651Skris{ 41568651Skris return (dev & MAXMINOR); 41659191Skris} 417109998Smarkm 418296465Sdelphijint 41968651Skrisumajor(dev_t dev) 42055714Skris{ 42155714Skris return ((dev & ~MAXMINOR) >> 8); 42255714Skris} 42355714Skris 42455714Skrisstatic void 42555714Skrisfini_cdevsw(struct cdevsw *devsw) 42655714Skris{ 42755714Skris struct cdevsw *gt; 42855714Skris 42955714Skris if (devsw->d_gianttrick != NULL) { 430296465Sdelphij gt = devsw->d_gianttrick; 431296465Sdelphij memcpy(devsw, gt, sizeof *devsw); 43255714Skris free(gt, M_DEVT); 43355714Skris devsw->d_gianttrick = NULL; 434296465Sdelphij } 43555714Skris devsw->d_flags &= ~D_INIT; 436296465Sdelphij} 43755714Skris 43855714Skrisstatic void 43959191Skrisprep_cdevsw(struct cdevsw *devsw) 440296465Sdelphij{ 44155714Skris struct cdevsw *dsw2; 44255714Skris 44355714Skris if (devsw->d_flags & D_NEEDGIANT) 44455714Skris dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK); 44555714Skris else 446296465Sdelphij dsw2 = NULL; 44755714Skris dev_lock(); 448296465Sdelphij 44955714Skris if (devsw->d_version != D_VERSION_01) { 450296465Sdelphij printf( 451296465Sdelphij "WARNING: Device driver \"%s\" has wrong version %s\n", 452296465Sdelphij devsw->d_name, "and is disabled. Recompile KLD module."); 453296465Sdelphij devsw->d_open = dead_open; 45455714Skris devsw->d_close = dead_close; 45555714Skris devsw->d_read = dead_read; 456296465Sdelphij devsw->d_write = dead_write; 457296465Sdelphij devsw->d_ioctl = dead_ioctl; 458296465Sdelphij devsw->d_poll = dead_poll; 459296465Sdelphij devsw->d_mmap = dead_mmap; 460296465Sdelphij devsw->d_strategy = dead_strategy; 46155714Skris devsw->d_dump = dead_dump; 462296465Sdelphij devsw->d_kqfilter = dead_kqfilter; 463296465Sdelphij } 464296465Sdelphij 465296465Sdelphij if (devsw->d_flags & D_TTY) { 466296465Sdelphij if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 467296465Sdelphij if (devsw->d_read == NULL) devsw->d_read = ttyread; 468296465Sdelphij if (devsw->d_write == NULL) devsw->d_write = ttywrite; 469296465Sdelphij if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 470296465Sdelphij if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 471296465Sdelphij } 47255714Skris 47359191Skris if (devsw->d_flags & D_NEEDGIANT) { 474296465Sdelphij if (devsw->d_gianttrick == NULL) { 475296465Sdelphij memcpy(dsw2, devsw, sizeof *dsw2); 476296465Sdelphij devsw->d_gianttrick = dsw2; 47759191Skris } else 47859191Skris free(dsw2, M_DEVT); 47959191Skris } 480296465Sdelphij 481160814Ssimon#define FIXUP(member, noop, giant) \ 482160814Ssimon do { \ 483296465Sdelphij if (devsw->member == NULL) { \ 48489837Skris devsw->member = noop; \ 485296465Sdelphij } else if (devsw->d_flags & D_NEEDGIANT) \ 486296465Sdelphij devsw->member = giant; \ 487160814Ssimon } \ 488160814Ssimon while (0) 48955714Skris 490160814Ssimon FIXUP(d_open, null_open, giant_open); 491160814Ssimon FIXUP(d_fdopen, NULL, giant_fdopen); 492160814Ssimon FIXUP(d_close, null_close, giant_close); 493160814Ssimon FIXUP(d_read, no_read, giant_read); 494160814Ssimon FIXUP(d_write, no_write, giant_write); 495160814Ssimon FIXUP(d_ioctl, no_ioctl, giant_ioctl); 496160814Ssimon FIXUP(d_poll, no_poll, giant_poll); 497160814Ssimon FIXUP(d_mmap, no_mmap, giant_mmap); 498160814Ssimon FIXUP(d_strategy, no_strategy, giant_strategy); 499296465Sdelphij FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 500296465Sdelphij 501296465Sdelphij if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 502160814Ssimon 503296465Sdelphij LIST_INIT(&devsw->d_devs); 504296465Sdelphij 505160814Ssimon devsw->d_flags |= D_INIT; 506296465Sdelphij 507160814Ssimon dev_unlock(); 508160814Ssimon} 509160814Ssimon 510160814Ssimonstatic struct cdev * 511160814Ssimonmake_dev_credv(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 512160814Ssimon gid_t gid, int mode, const char *fmt, va_list ap) 513296465Sdelphij{ 514296465Sdelphij struct cdev *dev; 515296465Sdelphij int i; 516160814Ssimon 517160814Ssimon KASSERT((minornr & ~MAXMINOR) == 0, 518160814Ssimon ("Invalid minor (0x%x) in make_dev", minornr)); 519160814Ssimon 520160814Ssimon if (!(devsw->d_flags & D_INIT)) 521160814Ssimon prep_cdevsw(devsw); 522160814Ssimon dev = devfs_alloc(); 523296465Sdelphij dev_lock(); 524296465Sdelphij dev = newdev(devsw, minornr, dev); 525160814Ssimon if (dev->si_flags & SI_CHEAPCLONE && 526160814Ssimon dev->si_flags & SI_NAMED) { 527160814Ssimon /* 528160814Ssimon * This is allowed as it removes races and generally 529296465Sdelphij * simplifies cloning devices. 530296465Sdelphij * XXX: still ?? 531160814Ssimon */ 532296465Sdelphij dev_unlock(); 533296465Sdelphij return (dev); 534296465Sdelphij } 535160814Ssimon KASSERT(!(dev->si_flags & SI_NAMED), 536296465Sdelphij ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 537296465Sdelphij devsw->d_name, minor(dev), devtoname(dev))); 538296465Sdelphij 539160814Ssimon i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 540160814Ssimon if (i > (sizeof dev->__si_namebuf - 1)) { 541160814Ssimon printf("WARNING: Device name truncated! (%s)\n", 542296465Sdelphij dev->__si_namebuf); 543296465Sdelphij } 544160814Ssimon 545160814Ssimon dev->si_flags |= SI_NAMED; 546160814Ssimon if (cr != NULL) 547296465Sdelphij dev->si_cred = crhold(cr); 548296465Sdelphij else 549296465Sdelphij dev->si_cred = NULL; 550296465Sdelphij dev->si_uid = uid; 551296465Sdelphij dev->si_gid = gid; 552160814Ssimon dev->si_mode = mode; 55355714Skris 55455714Skris devfs_create(dev); 55555714Skris dev_unlock(); 55655714Skris return (dev); 557} 558 559struct cdev * 560make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode, 561 const char *fmt, ...) 562{ 563 struct cdev *dev; 564 va_list ap; 565 566 va_start(ap, fmt); 567 dev = make_dev_credv(devsw, minornr, NULL, uid, gid, mode, fmt, ap); 568 va_end(ap); 569 return (dev); 570} 571 572struct cdev * 573make_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 574 gid_t gid, int mode, const char *fmt, ...) 575{ 576 struct cdev *dev; 577 va_list ap; 578 579 va_start(ap, fmt); 580 dev = make_dev_credv(devsw, minornr, cr, uid, gid, mode, fmt, ap); 581 va_end(ap); 582 583 return (dev); 584} 585 586static void 587dev_dependsl(struct cdev *pdev, struct cdev *cdev) 588{ 589 590 cdev->si_parent = pdev; 591 cdev->si_flags |= SI_CHILD; 592 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 593} 594 595 596void 597dev_depends(struct cdev *pdev, struct cdev *cdev) 598{ 599 600 dev_lock(); 601 dev_dependsl(pdev, cdev); 602 dev_unlock(); 603} 604 605struct cdev * 606make_dev_alias(struct cdev *pdev, const char *fmt, ...) 607{ 608 struct cdev *dev; 609 va_list ap; 610 int i; 611 612 dev = devfs_alloc(); 613 dev_lock(); 614 dev->si_flags |= SI_ALIAS; 615 dev->si_flags |= SI_NAMED; 616 va_start(ap, fmt); 617 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 618 if (i > (sizeof dev->__si_namebuf - 1)) { 619 printf("WARNING: Device name truncated! (%s)\n", 620 dev->__si_namebuf); 621 } 622 va_end(ap); 623 624 devfs_create(dev); 625 dev_unlock(); 626 dev_depends(pdev, dev); 627 return (dev); 628} 629 630static void 631destroy_devl(struct cdev *dev) 632{ 633 struct cdevsw *csw; 634 635 mtx_assert(&devmtx, MA_OWNED); 636 KASSERT(dev->si_flags & SI_NAMED, 637 ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev))); 638 639 devfs_destroy(dev); 640 641 /* Remove name marking */ 642 dev->si_flags &= ~SI_NAMED; 643 644 /* If we are a child, remove us from the parents list */ 645 if (dev->si_flags & SI_CHILD) { 646 LIST_REMOVE(dev, si_siblings); 647 dev->si_flags &= ~SI_CHILD; 648 } 649 650 /* Kill our children */ 651 while (!LIST_EMPTY(&dev->si_children)) 652 destroy_devl(LIST_FIRST(&dev->si_children)); 653 654 /* Remove from clone list */ 655 if (dev->si_flags & SI_CLONELIST) { 656 LIST_REMOVE(dev, si_clone); 657 dev->si_flags &= ~SI_CLONELIST; 658 } 659 660 csw = dev->si_devsw; 661 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 662 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 663 printf("Purging %lu threads from %s\n", 664 dev->si_threadcount, devtoname(dev)); 665 csw->d_purge(dev); 666 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 667 } 668 if (csw != NULL && csw->d_purge != NULL) 669 printf("All threads purged from %s\n", devtoname(dev)); 670 671 dev->si_drv1 = 0; 672 dev->si_drv2 = 0; 673 bzero(&dev->__si_u, sizeof(dev->__si_u)); 674 675 if (!(dev->si_flags & SI_ALIAS)) { 676 /* Remove from cdevsw list */ 677 LIST_REMOVE(dev, si_list); 678 679 /* If cdevsw has no more struct cdev *'s, clean it */ 680 if (LIST_EMPTY(&csw->d_devs)) 681 fini_cdevsw(csw); 682 } 683 dev->si_flags &= ~SI_ALIAS; 684 685 if (dev->si_refcount > 0) { 686 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 687 } else { 688 devfs_free(dev); 689 } 690} 691 692void 693destroy_dev(struct cdev *dev) 694{ 695 696 dev_lock(); 697 destroy_devl(dev); 698 dev_unlock(); 699} 700 701const char * 702devtoname(struct cdev *dev) 703{ 704 char *p; 705 struct cdevsw *csw; 706 int mynor; 707 708 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 709 p = dev->si_name; 710 csw = dev_refthread(dev); 711 if (csw != NULL) { 712 sprintf(p, "(%s)", csw->d_name); 713 dev_relthread(dev); 714 } 715 p += strlen(p); 716 mynor = minor(dev); 717 if (mynor < 0 || mynor > 255) 718 sprintf(p, "/%#x", (u_int)mynor); 719 else 720 sprintf(p, "/%d", mynor); 721 } 722 return (dev->si_name); 723} 724 725int 726dev_stdclone(char *name, char **namep, const char *stem, int *unit) 727{ 728 int u, i; 729 730 i = strlen(stem); 731 if (bcmp(stem, name, i) != 0) 732 return (0); 733 if (!isdigit(name[i])) 734 return (0); 735 u = 0; 736 if (name[i] == '0' && isdigit(name[i+1])) 737 return (0); 738 while (isdigit(name[i])) { 739 u *= 10; 740 u += name[i++] - '0'; 741 } 742 if (u > 0xffffff) 743 return (0); 744 *unit = u; 745 if (namep) 746 *namep = &name[i]; 747 if (name[i]) 748 return (2); 749 return (1); 750} 751 752/* 753 * Helper functions for cloning device drivers. 754 * 755 * The objective here is to make it unnecessary for the device drivers to 756 * use rman or similar to manage their unit number space. Due to the way 757 * we do "on-demand" devices, using rman or other "private" methods 758 * will be very tricky to lock down properly once we lock down this file. 759 * 760 * Instead we give the drivers these routines which puts the struct cdev *'s 761 * that are to be managed on their own list, and gives the driver the ability 762 * to ask for the first free unit number or a given specified unit number. 763 * 764 * In addition these routines support paired devices (pty, nmdm and similar) 765 * by respecting a number of "flag" bits in the minor number. 766 * 767 */ 768 769struct clonedevs { 770 LIST_HEAD(,cdev) head; 771}; 772 773void 774clone_setup(struct clonedevs **cdp) 775{ 776 777 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 778 LIST_INIT(&(*cdp)->head); 779} 780 781int 782clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 783{ 784 struct clonedevs *cd; 785 struct cdev *dev, *ndev, *dl, *de; 786 int unit, low, u; 787 788 KASSERT(*cdp != NULL, 789 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 790 KASSERT(!(extra & CLONE_UNITMASK), 791 ("Illegal extra bits (0x%x) in clone_create", extra)); 792 KASSERT(*up <= CLONE_UNITMASK, 793 ("Too high unit (0x%x) in clone_create", *up)); 794 795 if (!(csw->d_flags & D_INIT)) 796 prep_cdevsw(csw); 797 798 /* 799 * Search the list for a lot of things in one go: 800 * A preexisting match is returned immediately. 801 * The lowest free unit number if we are passed -1, and the place 802 * in the list where we should insert that new element. 803 * The place to insert a specified unit number, if applicable 804 * the end of the list. 805 */ 806 unit = *up; 807 ndev = devfs_alloc(); 808 dev_lock(); 809 low = extra; 810 de = dl = NULL; 811 cd = *cdp; 812 LIST_FOREACH(dev, &cd->head, si_clone) { 813 KASSERT(dev->si_flags & SI_CLONELIST, 814 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 815 u = dev2unit(dev); 816 if (u == (unit | extra)) { 817 *dp = dev; 818 devfs_free(ndev); 819 dev_unlock(); 820 return (0); 821 } 822 if (unit == -1 && u == low) { 823 low++; 824 de = dev; 825 continue; 826 } else if (u < (unit | extra)) { 827 de = dev; 828 continue; 829 } else if (u > (unit | extra)) { 830 dl = dev; 831 break; 832 } 833 } 834 if (unit == -1) 835 unit = low & CLONE_UNITMASK; 836 dev = newdev(csw, unit2minor(unit | extra), ndev); 837 if (dev->si_flags & SI_CLONELIST) { 838 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 839 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 840 LIST_FOREACH(dev, &cd->head, si_clone) { 841 printf("\t%p %s\n", dev, dev->si_name); 842 } 843 panic("foo"); 844 } 845 KASSERT(!(dev->si_flags & SI_CLONELIST), 846 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 847 if (dl != NULL) 848 LIST_INSERT_BEFORE(dl, dev, si_clone); 849 else if (de != NULL) 850 LIST_INSERT_AFTER(de, dev, si_clone); 851 else 852 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 853 dev->si_flags |= SI_CLONELIST; 854 *up = unit; 855 dev_unlock(); 856 return (1); 857} 858 859/* 860 * Kill everything still on the list. The driver should already have 861 * disposed of any softc hung of the struct cdev *'s at this time. 862 */ 863void 864clone_cleanup(struct clonedevs **cdp) 865{ 866 struct cdev *dev, *tdev; 867 struct clonedevs *cd; 868 869 cd = *cdp; 870 if (cd == NULL) 871 return; 872 dev_lock(); 873 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 874 KASSERT(dev->si_flags & SI_CLONELIST, 875 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 876 KASSERT(dev->si_flags & SI_NAMED, 877 ("Driver has goofed in cloning underways udev %x", dev->si_drv0)); 878 destroy_devl(dev); 879 } 880 dev_unlock(); 881 free(cd, M_DEVBUF); 882 *cdp = NULL; 883} 884