kern_conf.c revision 163529
111126Sjulian/*- 2103722Sphk * Copyright (c) 1999-2002 Poul-Henning Kamp 311126Sjulian * All rights reserved. 411126Sjulian * 511126Sjulian * Redistribution and use in source and binary forms, with or without 611126Sjulian * modification, are permitted provided that the following conditions 711126Sjulian * are met: 811126Sjulian * 1. Redistributions of source code must retain the above copyright 911126Sjulian * notice, this list of conditions and the following disclaimer. 1011126Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1111126Sjulian * notice, this list of conditions and the following disclaimer in the 1211126Sjulian * documentation and/or other materials provided with the distribution. 1311126Sjulian * 14103722Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15103722Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1611126Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17103722Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1811126Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1911126Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2011126Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2111126Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2211126Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2311126Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2411126Sjulian * SUCH DAMAGE. 2511126Sjulian */ 2611126Sjulian 27116182Sobrien#include <sys/cdefs.h> 28116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 163529 2006-10-20 07:59:50Z kib $"); 29116182Sobrien 3011126Sjulian#include <sys/param.h> 3148936Sphk#include <sys/kernel.h> 3283366Sjulian#include <sys/systm.h> 33111179Sphk#include <sys/bio.h> 3490737Sgreen#include <sys/lock.h> 3590737Sgreen#include <sys/mutex.h> 3636735Sdfr#include <sys/module.h> 3748936Sphk#include <sys/malloc.h> 3811126Sjulian#include <sys/conf.h> 3912954Sjulian#include <sys/vnode.h> 4048936Sphk#include <sys/queue.h> 41120514Sphk#include <sys/poll.h> 4265374Sphk#include <sys/ctype.h> 43126078Sphk#include <sys/tty.h> 44147982Srwatson#include <sys/ucred.h> 4549535Sphk#include <machine/stdarg.h> 4611126Sjulian 47149144Sphk#include <fs/devfs/devfs_int.h> 48149144Sphk 49131996Sphkstatic MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 5048936Sphk 51150342Sphkstruct mtx devmtx; 52142242Sphkstatic void destroy_devl(struct cdev *dev); 53147982Srwatsonstatic struct cdev *make_dev_credv(struct cdevsw *devsw, int minornr, 54147982Srwatson struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 55147982Srwatson va_list ap); 56126082Sphk 57135600Sphkvoid 58135600Sphkdev_lock(void) 59126082Sphk{ 60151450Sjhb 61126082Sphk mtx_lock(&devmtx); 62126082Sphk} 63126082Sphk 64135600Sphkvoid 65135600Sphkdev_unlock(void) 66126082Sphk{ 67135704Sphk 68126082Sphk mtx_unlock(&devmtx); 69126082Sphk} 70126082Sphk 71126082Sphkvoid 72144385Sphkdev_ref(struct cdev *dev) 73144385Sphk{ 74144385Sphk 75144385Sphk mtx_assert(&devmtx, MA_NOTOWNED); 76144385Sphk mtx_lock(&devmtx); 77144385Sphk dev->si_refcount++; 78144385Sphk mtx_unlock(&devmtx); 79144385Sphk} 80144385Sphk 81144385Sphkvoid 82144384Sphkdev_refl(struct cdev *dev) 83126082Sphk{ 84135704Sphk 85142232Sphk mtx_assert(&devmtx, MA_OWNED); 86126082Sphk dev->si_refcount++; 87126082Sphk} 88126082Sphk 89126082Sphkvoid 90142242Sphkdev_rel(struct cdev *dev) 91126082Sphk{ 92142242Sphk int flag = 0; 93135600Sphk 94136014Sphk mtx_assert(&devmtx, MA_NOTOWNED); 95136014Sphk dev_lock(); 96126082Sphk dev->si_refcount--; 97126082Sphk KASSERT(dev->si_refcount >= 0, 98126082Sphk ("dev_rel(%s) gave negative count", devtoname(dev))); 99150342Sphk#if 0 100142242Sphk if (dev->si_usecount == 0 && 101142242Sphk (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 102150342Sphk ; 103150342Sphk else 104150342Sphk#endif 105154029Sbz if (dev->si_devsw == NULL && dev->si_refcount == 0) { 106126082Sphk LIST_REMOVE(dev, si_list); 107136014Sphk flag = 1; 108136014Sphk } 109136014Sphk dev_unlock(); 110136014Sphk if (flag) 111150342Sphk devfs_free(dev); 112126082Sphk} 113136014Sphk 114135704Sphkstruct cdevsw * 115135704Sphkdev_refthread(struct cdev *dev) 116135704Sphk{ 117135704Sphk struct cdevsw *csw; 118126082Sphk 119135704Sphk mtx_assert(&devmtx, MA_NOTOWNED); 120135704Sphk dev_lock(); 121135704Sphk csw = dev->si_devsw; 122135704Sphk if (csw != NULL) 123135704Sphk dev->si_threadcount++; 124135704Sphk dev_unlock(); 125135704Sphk return (csw); 126135704Sphk} 127135704Sphk 128163529Skibstruct cdevsw * 129163529Skibdevvn_refthread(struct vnode *vp, struct cdev **devp) 130163529Skib{ 131163529Skib struct cdevsw *csw; 132163529Skib 133163529Skib mtx_assert(&devmtx, MA_NOTOWNED); 134163529Skib csw = NULL; 135163529Skib dev_lock(); 136163529Skib *devp = vp->v_rdev; 137163529Skib if (*devp != NULL) { 138163529Skib csw = (*devp)->si_devsw; 139163529Skib if (csw != NULL) 140163529Skib (*devp)->si_threadcount++; 141163529Skib } 142163529Skib dev_unlock(); 143163529Skib return (csw); 144163529Skib} 145163529Skib 146135704Sphkvoid 147135704Sphkdev_relthread(struct cdev *dev) 148135704Sphk{ 149135704Sphk 150135704Sphk mtx_assert(&devmtx, MA_NOTOWNED); 151135704Sphk dev_lock(); 152135704Sphk dev->si_threadcount--; 153135704Sphk dev_unlock(); 154135704Sphk} 155135704Sphk 156120514Sphkint 157120514Sphknullop(void) 158120514Sphk{ 15985603Sphk 160120514Sphk return (0); 161120514Sphk} 162120514Sphk 163120514Sphkint 164120514Sphkeopnotsupp(void) 165120514Sphk{ 166120514Sphk 167120514Sphk return (EOPNOTSUPP); 168120514Sphk} 169120514Sphk 170111179Sphkstatic int 171111179Sphkenxio(void) 172111179Sphk{ 173111179Sphk return (ENXIO); 174111179Sphk} 175111179Sphk 176120514Sphkstatic int 177120514Sphkenodev(void) 178120514Sphk{ 179120514Sphk return (ENODEV); 180120514Sphk} 181120514Sphk 182120514Sphk/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 183120514Sphk 184111179Sphk#define dead_open (d_open_t *)enxio 185111179Sphk#define dead_close (d_close_t *)enxio 186111179Sphk#define dead_read (d_read_t *)enxio 187111179Sphk#define dead_write (d_write_t *)enxio 188111179Sphk#define dead_ioctl (d_ioctl_t *)enxio 189120514Sphk#define dead_poll (d_poll_t *)enodev 190120514Sphk#define dead_mmap (d_mmap_t *)enodev 191111179Sphk 192111179Sphkstatic void 193111179Sphkdead_strategy(struct bio *bp) 194111179Sphk{ 195111179Sphk 196111179Sphk biofinish(bp, NULL, ENXIO); 197111179Sphk} 198111179Sphk 199111220Sphk#define dead_dump (dumper_t *)enxio 200111179Sphk#define dead_kqfilter (d_kqfilter_t *)enxio 201111179Sphk 202111179Sphkstatic struct cdevsw dead_cdevsw = { 203126080Sphk .d_version = D_VERSION, 204126080Sphk .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 205111815Sphk .d_open = dead_open, 206111815Sphk .d_close = dead_close, 207111815Sphk .d_read = dead_read, 208111815Sphk .d_write = dead_write, 209111815Sphk .d_ioctl = dead_ioctl, 210111815Sphk .d_poll = dead_poll, 211111815Sphk .d_mmap = dead_mmap, 212111815Sphk .d_strategy = dead_strategy, 213111815Sphk .d_name = "dead", 214111815Sphk .d_dump = dead_dump, 215111815Sphk .d_kqfilter = dead_kqfilter 216111179Sphk}; 217111179Sphk 218120514Sphk/* Default methods if driver does not specify method */ 219111179Sphk 220120514Sphk#define null_open (d_open_t *)nullop 221120514Sphk#define null_close (d_close_t *)nullop 222120514Sphk#define no_read (d_read_t *)enodev 223120514Sphk#define no_write (d_write_t *)enodev 224120514Sphk#define no_ioctl (d_ioctl_t *)enodev 225120514Sphk#define no_mmap (d_mmap_t *)enodev 226133741Sjmg#define no_kqfilter (d_kqfilter_t *)enodev 227120514Sphk 228120514Sphkstatic void 229120514Sphkno_strategy(struct bio *bp) 230120514Sphk{ 231120514Sphk 232120514Sphk biofinish(bp, NULL, ENODEV); 233120514Sphk} 234120514Sphk 235120514Sphkstatic int 236130585Sphkno_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 237120514Sphk{ 238120514Sphk /* 239120514Sphk * Return true for read/write. If the user asked for something 240120514Sphk * special, return POLLNVAL, so that clients have a way of 241120514Sphk * determining reliably whether or not the extended 242120514Sphk * functionality is present without hard-coding knowledge 243120514Sphk * of specific filesystem implementations. 244120514Sphk * Stay in sync with vop_nopoll(). 245120514Sphk */ 246120514Sphk if (events & ~POLLSTANDARD) 247120514Sphk return (POLLNVAL); 248120514Sphk 249120514Sphk return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 250120514Sphk} 251120514Sphk 252120514Sphk#define no_dump (dumper_t *)enodev 253120514Sphk 254149177Sphkstatic int 255149177Sphkgiant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 256149177Sphk{ 257149177Sphk int retval; 258149177Sphk 259149177Sphk mtx_lock(&Giant); 260149177Sphk retval = dev->si_devsw->d_gianttrick-> 261149177Sphk d_open(dev, oflags, devtype, td); 262149177Sphk mtx_unlock(&Giant); 263149177Sphk return (retval); 264149177Sphk} 265149177Sphk 266149177Sphkstatic int 267149177Sphkgiant_fdopen(struct cdev *dev, int oflags, struct thread *td, int fdidx) 268149177Sphk{ 269149177Sphk int retval; 270149177Sphk 271149177Sphk mtx_lock(&Giant); 272149177Sphk retval = dev->si_devsw->d_gianttrick-> 273149177Sphk d_fdopen(dev, oflags, td, fdidx); 274149177Sphk mtx_unlock(&Giant); 275149177Sphk return (retval); 276149177Sphk} 277149177Sphk 278149177Sphkstatic int 279149177Sphkgiant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 280149177Sphk{ 281149177Sphk int retval; 282149177Sphk 283149177Sphk mtx_lock(&Giant); 284149177Sphk retval = dev->si_devsw->d_gianttrick-> 285149177Sphk d_close(dev, fflag, devtype, td); 286149177Sphk mtx_unlock(&Giant); 287149177Sphk return (retval); 288149177Sphk} 289149177Sphk 290149177Sphkstatic void 291149177Sphkgiant_strategy(struct bio *bp) 292149177Sphk{ 293149177Sphk 294149177Sphk mtx_lock(&Giant); 295149177Sphk bp->bio_dev->si_devsw->d_gianttrick-> 296149177Sphk d_strategy(bp); 297149177Sphk mtx_unlock(&Giant); 298149177Sphk} 299149177Sphk 300149177Sphkstatic int 301149177Sphkgiant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 302149177Sphk{ 303149177Sphk int retval; 304149177Sphk 305149177Sphk mtx_lock(&Giant); 306149177Sphk retval = dev->si_devsw->d_gianttrick-> 307149177Sphk d_ioctl(dev, cmd, data, fflag, td); 308149177Sphk mtx_unlock(&Giant); 309149177Sphk return (retval); 310149177Sphk} 311149177Sphk 312149177Sphkstatic int 313149177Sphkgiant_read(struct cdev *dev, struct uio *uio, int ioflag) 314149177Sphk{ 315149177Sphk int retval; 316149177Sphk 317149177Sphk mtx_lock(&Giant); 318149177Sphk retval = dev->si_devsw->d_gianttrick-> 319149177Sphk d_read(dev, uio, ioflag); 320149177Sphk mtx_unlock(&Giant); 321149177Sphk return (retval); 322149177Sphk} 323149177Sphk 324149177Sphkstatic int 325149177Sphkgiant_write(struct cdev *dev, struct uio *uio, int ioflag) 326149177Sphk{ 327149177Sphk int retval; 328149177Sphk 329149177Sphk mtx_lock(&Giant); 330149177Sphk retval = dev->si_devsw->d_gianttrick-> 331149177Sphk d_write(dev, uio, ioflag); 332149177Sphk mtx_unlock(&Giant); 333149177Sphk return (retval); 334149177Sphk} 335149177Sphk 336149177Sphkstatic int 337149177Sphkgiant_poll(struct cdev *dev, int events, struct thread *td) 338149177Sphk{ 339149177Sphk int retval; 340149177Sphk 341149177Sphk mtx_lock(&Giant); 342149177Sphk retval = dev->si_devsw->d_gianttrick-> 343149177Sphk d_poll(dev, events, td); 344149177Sphk mtx_unlock(&Giant); 345149177Sphk return (retval); 346149177Sphk} 347149177Sphk 348149177Sphkstatic int 349149177Sphkgiant_kqfilter(struct cdev *dev, struct knote *kn) 350149177Sphk{ 351149177Sphk int retval; 352149177Sphk 353149177Sphk mtx_lock(&Giant); 354149177Sphk retval = dev->si_devsw->d_gianttrick-> 355149177Sphk d_kqfilter(dev, kn); 356149177Sphk mtx_unlock(&Giant); 357149177Sphk return (retval); 358149177Sphk} 359149177Sphk 360149177Sphkstatic int 361149177Sphkgiant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot) 362149177Sphk{ 363149177Sphk int retval; 364149177Sphk 365149177Sphk mtx_lock(&Giant); 366149177Sphk retval = dev->si_devsw->d_gianttrick-> 367149177Sphk d_mmap(dev, offset, paddr, nprot); 368149177Sphk mtx_unlock(&Giant); 369149177Sphk return (retval); 370149177Sphk} 371149177Sphk 372149177Sphk 37347640Sphk/* 374130936Sle * struct cdev * and u_dev_t primitives 37547028Sphk */ 37647028Sphk 37747028Sphkint 378130585Sphkminor(struct cdev *x) 37947028Sphk{ 380130640Sphk if (x == NULL) 381130640Sphk return NODEV; 382143631Sphk return(x->si_drv0 & MAXMINOR); 38347028Sphk} 38447028Sphk 38549826Sphkint 386130585Sphkdev2unit(struct cdev *x) 38749826Sphk{ 38849826Sphk 389130640Sphk if (x == NULL) 390130640Sphk return NODEV; 391140964Sphk return (minor2unit(minor(x))); 39249826Sphk} 39349826Sphk 394143282Sphku_int 395143282Sphkminor2unit(u_int _minor) 396140963Sphk{ 397140963Sphk 398140969Sphk KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 399143282Sphk return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00)); 400140963Sphk} 401140963Sphk 402140963Sphkint 40366067Sphkunit2minor(int unit) 40466067Sphk{ 40566067Sphk 40674522Sphk KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 40766067Sphk return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 40866067Sphk} 40966067Sphk 410130585Sphkstatic struct cdev * 411144281Sphknewdev(struct cdevsw *csw, int y, struct cdev *si) 41247028Sphk{ 413140733Sphk struct cdev *si2; 414130640Sphk dev_t udev; 41548936Sphk 416140733Sphk mtx_assert(&devmtx, MA_OWNED); 417144292Sphk udev = y; 418144281Sphk LIST_FOREACH(si2, &csw->d_devs, si_list) { 419143631Sphk if (si2->si_drv0 == udev) { 420150342Sphk devfs_free(si); 421140733Sphk return (si2); 422140733Sphk } 42348936Sphk } 424143631Sphk si->si_drv0 = udev; 425150342Sphk si->si_devsw = csw; 426144281Sphk LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 427125850Sbde return (si); 42847028Sphk} 42947028Sphk 43047028Sphkint 431130640Sphkuminor(dev_t dev) 43247028Sphk{ 433140969Sphk return (dev & MAXMINOR); 43447028Sphk} 43547028Sphk 43647028Sphkint 437130640Sphkumajor(dev_t dev) 43847028Sphk{ 439140969Sphk return ((dev & ~MAXMINOR) >> 8); 44047028Sphk} 44147028Sphk 442125846Sphkstatic void 443144292Sphkfini_cdevsw(struct cdevsw *devsw) 44449535Sphk{ 445149324Sphk struct cdevsw *gt; 44649535Sphk 447149324Sphk if (devsw->d_gianttrick != NULL) { 448149324Sphk gt = devsw->d_gianttrick; 449149324Sphk memcpy(devsw, gt, sizeof *devsw); 450149324Sphk free(gt, M_DEVT); 451149324Sphk devsw->d_gianttrick = NULL; 452149324Sphk } 453126156Sphk devsw->d_flags &= ~D_INIT; 454126082Sphk} 455126082Sphk 456126082Sphkstatic void 457126077Sphkprep_cdevsw(struct cdevsw *devsw) 458126077Sphk{ 459149177Sphk struct cdevsw *dsw2; 460126077Sphk 461149177Sphk if (devsw->d_flags & D_NEEDGIANT) 462149177Sphk dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK); 463149177Sphk else 464149177Sphk dsw2 = NULL; 465135600Sphk dev_lock(); 466126082Sphk 467143746Sphk if (devsw->d_version != D_VERSION_01) { 468126082Sphk printf( 469126082Sphk "WARNING: Device driver \"%s\" has wrong version %s\n", 470154266Salfred devsw->d_name == NULL ? "???" : devsw->d_name, 471154266Salfred "and is disabled. Recompile KLD module."); 472126082Sphk devsw->d_open = dead_open; 473126082Sphk devsw->d_close = dead_close; 474126082Sphk devsw->d_read = dead_read; 475126082Sphk devsw->d_write = dead_write; 476126082Sphk devsw->d_ioctl = dead_ioctl; 477126082Sphk devsw->d_poll = dead_poll; 478126082Sphk devsw->d_mmap = dead_mmap; 479126082Sphk devsw->d_strategy = dead_strategy; 480126082Sphk devsw->d_dump = dead_dump; 481126082Sphk devsw->d_kqfilter = dead_kqfilter; 482126082Sphk } 483126082Sphk 484126078Sphk if (devsw->d_flags & D_TTY) { 485129943Sphk if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 486126078Sphk if (devsw->d_read == NULL) devsw->d_read = ttyread; 487126078Sphk if (devsw->d_write == NULL) devsw->d_write = ttywrite; 488126078Sphk if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 489126078Sphk if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 490126078Sphk } 491126078Sphk 492149177Sphk if (devsw->d_flags & D_NEEDGIANT) { 493149177Sphk if (devsw->d_gianttrick == NULL) { 494149177Sphk memcpy(dsw2, devsw, sizeof *dsw2); 495149177Sphk devsw->d_gianttrick = dsw2; 496149177Sphk } else 497149177Sphk free(dsw2, M_DEVT); 498149177Sphk } 499149177Sphk 500149177Sphk#define FIXUP(member, noop, giant) \ 501149177Sphk do { \ 502149177Sphk if (devsw->member == NULL) { \ 503149177Sphk devsw->member = noop; \ 504149177Sphk } else if (devsw->d_flags & D_NEEDGIANT) \ 505149177Sphk devsw->member = giant; \ 506149177Sphk } \ 507149177Sphk while (0) 508149177Sphk 509149177Sphk FIXUP(d_open, null_open, giant_open); 510149177Sphk FIXUP(d_fdopen, NULL, giant_fdopen); 511149177Sphk FIXUP(d_close, null_close, giant_close); 512149177Sphk FIXUP(d_read, no_read, giant_read); 513149177Sphk FIXUP(d_write, no_write, giant_write); 514149177Sphk FIXUP(d_ioctl, no_ioctl, giant_ioctl); 515149177Sphk FIXUP(d_poll, no_poll, giant_poll); 516149177Sphk FIXUP(d_mmap, no_mmap, giant_mmap); 517149177Sphk FIXUP(d_strategy, no_strategy, giant_strategy); 518149177Sphk FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 519149177Sphk 520120514Sphk if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 521126082Sphk 522126082Sphk LIST_INIT(&devsw->d_devs); 523126082Sphk 524126082Sphk devsw->d_flags |= D_INIT; 525126082Sphk 526135600Sphk dev_unlock(); 527125846Sphk} 528111622Sphk 529147982Srwatsonstatic struct cdev * 530147982Srwatsonmake_dev_credv(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 531147982Srwatson gid_t gid, int mode, const char *fmt, va_list ap) 532125846Sphk{ 533130585Sphk struct cdev *dev; 534125846Sphk int i; 535125846Sphk 536140969Sphk KASSERT((minornr & ~MAXMINOR) == 0, 537126082Sphk ("Invalid minor (0x%x) in make_dev", minornr)); 538126082Sphk 539144385Sphk if (!(devsw->d_flags & D_INIT)) 540126082Sphk prep_cdevsw(devsw); 541150342Sphk dev = devfs_alloc(); 542140733Sphk dev_lock(); 543144281Sphk dev = newdev(devsw, minornr, dev); 544120529Sphk if (dev->si_flags & SI_CHEAPCLONE && 545150342Sphk dev->si_flags & SI_NAMED) { 546120529Sphk /* 547120529Sphk * This is allowed as it removes races and generally 548120529Sphk * simplifies cloning devices. 549126082Sphk * XXX: still ?? 550120529Sphk */ 551140733Sphk dev_unlock(); 552120529Sphk return (dev); 553120529Sphk } 554126082Sphk KASSERT(!(dev->si_flags & SI_NAMED), 555144281Sphk ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 556144281Sphk devsw->d_name, minor(dev), devtoname(dev))); 557126082Sphk 558110318Sphk i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 559110318Sphk if (i > (sizeof dev->__si_namebuf - 1)) { 560134501Spjd printf("WARNING: Device name truncated! (%s)\n", 561110318Sphk dev->__si_namebuf); 562110318Sphk } 563136947Sphk 56465747Sphk dev->si_flags |= SI_NAMED; 565147982Srwatson if (cr != NULL) 566147982Srwatson dev->si_cred = crhold(cr); 567147982Srwatson else 568147982Srwatson dev->si_cred = NULL; 569144385Sphk dev->si_uid = uid; 570144385Sphk dev->si_gid = gid; 571144385Sphk dev->si_mode = mode; 57250092Sjulian 573111730Sphk devfs_create(dev); 574135600Sphk dev_unlock(); 57549535Sphk return (dev); 57649535Sphk} 57749535Sphk 578147982Srwatsonstruct cdev * 579147982Srwatsonmake_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode, 580147982Srwatson const char *fmt, ...) 581147982Srwatson{ 582147982Srwatson struct cdev *dev; 583147982Srwatson va_list ap; 584147982Srwatson 585147982Srwatson va_start(ap, fmt); 586147982Srwatson dev = make_dev_credv(devsw, minornr, NULL, uid, gid, mode, fmt, ap); 587147982Srwatson va_end(ap); 588147982Srwatson return (dev); 589147982Srwatson} 590147982Srwatson 591147982Srwatsonstruct cdev * 592147982Srwatsonmake_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid, 593147982Srwatson gid_t gid, int mode, const char *fmt, ...) 594147982Srwatson{ 595147982Srwatson struct cdev *dev; 596147982Srwatson va_list ap; 597147982Srwatson 598147982Srwatson va_start(ap, fmt); 599147982Srwatson dev = make_dev_credv(devsw, minornr, cr, uid, gid, mode, fmt, ap); 600147982Srwatson va_end(ap); 601147982Srwatson 602147982Srwatson return (dev); 603147982Srwatson} 604147982Srwatson 605150342Sphkstatic void 606150342Sphkdev_dependsl(struct cdev *pdev, struct cdev *cdev) 607150342Sphk{ 608150342Sphk 609150342Sphk cdev->si_parent = pdev; 610150342Sphk cdev->si_flags |= SI_CHILD; 611150342Sphk LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 612150342Sphk} 613150342Sphk 614150342Sphk 61577215Sphkvoid 616130585Sphkdev_depends(struct cdev *pdev, struct cdev *cdev) 61777215Sphk{ 61877215Sphk 619135600Sphk dev_lock(); 620150342Sphk dev_dependsl(pdev, cdev); 621135600Sphk dev_unlock(); 62277215Sphk} 62377215Sphk 624130585Sphkstruct cdev * 625130585Sphkmake_dev_alias(struct cdev *pdev, const char *fmt, ...) 62664880Sphk{ 627130585Sphk struct cdev *dev; 62864880Sphk va_list ap; 62964880Sphk int i; 63064880Sphk 631150342Sphk dev = devfs_alloc(); 632135600Sphk dev_lock(); 63364880Sphk dev->si_flags |= SI_ALIAS; 63465747Sphk dev->si_flags |= SI_NAMED; 63564880Sphk va_start(ap, fmt); 636110318Sphk i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 637110318Sphk if (i > (sizeof dev->__si_namebuf - 1)) { 638134501Spjd printf("WARNING: Device name truncated! (%s)\n", 639110318Sphk dev->__si_namebuf); 640110318Sphk } 64164880Sphk va_end(ap); 64264880Sphk 643111730Sphk devfs_create(dev); 644135600Sphk dev_unlock(); 645126082Sphk dev_depends(pdev, dev); 64664880Sphk return (dev); 64764880Sphk} 64864880Sphk 649126082Sphkstatic void 650142242Sphkdestroy_devl(struct cdev *dev) 65150549Sphk{ 652135843Sphk struct cdevsw *csw; 653135843Sphk 654142242Sphk mtx_assert(&devmtx, MA_OWNED); 655135843Sphk KASSERT(dev->si_flags & SI_NAMED, 656144281Sphk ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev))); 657154029Sbz 658111730Sphk devfs_destroy(dev); 659126082Sphk 660126082Sphk /* Remove name marking */ 661126077Sphk dev->si_flags &= ~SI_NAMED; 662126077Sphk 663126082Sphk /* If we are a child, remove us from the parents list */ 66477215Sphk if (dev->si_flags & SI_CHILD) { 66577215Sphk LIST_REMOVE(dev, si_siblings); 66677215Sphk dev->si_flags &= ~SI_CHILD; 66777215Sphk } 668126082Sphk 669126082Sphk /* Kill our children */ 67077215Sphk while (!LIST_EMPTY(&dev->si_children)) 671142242Sphk destroy_devl(LIST_FIRST(&dev->si_children)); 672126082Sphk 673126082Sphk /* Remove from clone list */ 674126077Sphk if (dev->si_flags & SI_CLONELIST) { 675126077Sphk LIST_REMOVE(dev, si_clone); 676126077Sphk dev->si_flags &= ~SI_CLONELIST; 677126077Sphk } 678126082Sphk 679163328Stegge dev->si_refcount++; /* Avoid race with dev_rel() */ 680135843Sphk csw = dev->si_devsw; 681135934Sgreen dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 682135934Sgreen while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 683135843Sphk csw->d_purge(dev); 684135843Sphk msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 685158684Sphk if (dev->si_threadcount) 686158684Sphk printf("Still %lu threads in %s\n", 687158684Sphk dev->si_threadcount, devtoname(dev)); 688135843Sphk } 689163328Stegge while (dev->si_threadcount != 0) { 690163328Stegge /* Use unique dummy wait ident */ 691163328Stegge msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 692163328Stegge } 693135843Sphk 694135843Sphk dev->si_drv1 = 0; 695135843Sphk dev->si_drv2 = 0; 696135843Sphk bzero(&dev->__si_u, sizeof(dev->__si_u)); 697135843Sphk 698126082Sphk if (!(dev->si_flags & SI_ALIAS)) { 699126082Sphk /* Remove from cdevsw list */ 700126082Sphk LIST_REMOVE(dev, si_list); 701126082Sphk 702150342Sphk /* If cdevsw has no more struct cdev *'s, clean it */ 703135844Sphk if (LIST_EMPTY(&csw->d_devs)) 704135844Sphk fini_cdevsw(csw); 705126082Sphk } 70665747Sphk dev->si_flags &= ~SI_ALIAS; 707163328Stegge dev->si_refcount--; /* Avoid race with dev_rel() */ 708135843Sphk 709126082Sphk if (dev->si_refcount > 0) { 710126082Sphk LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 711126082Sphk } else { 712150342Sphk devfs_free(dev); 713126082Sphk } 71450549Sphk} 71550549Sphk 716126082Sphkvoid 717130585Sphkdestroy_dev(struct cdev *dev) 718126082Sphk{ 719126082Sphk 720135600Sphk dev_lock(); 721142242Sphk destroy_devl(dev); 722135600Sphk dev_unlock(); 723126082Sphk} 724126082Sphk 72551225Sbdeconst char * 726130585Sphkdevtoname(struct cdev *dev) 72749982Sbillf{ 72850549Sphk char *p; 729135712Sphk struct cdevsw *csw; 73051225Sbde int mynor; 73149982Sbillf 73250549Sphk if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 73350549Sphk p = dev->si_name; 734135712Sphk csw = dev_refthread(dev); 735135712Sphk if (csw != NULL) { 736135712Sphk sprintf(p, "(%s)", csw->d_name); 737135712Sphk dev_relthread(dev); 738135712Sphk } 739135712Sphk p += strlen(p); 74051225Sbde mynor = minor(dev); 74151225Sbde if (mynor < 0 || mynor > 255) 742135712Sphk sprintf(p, "/%#x", (u_int)mynor); 74351225Sbde else 744135712Sphk sprintf(p, "/%d", mynor); 74550549Sphk } 74649982Sbillf return (dev->si_name); 74749982Sbillf} 74865374Sphk 74965374Sphkint 75091998Sphkdev_stdclone(char *name, char **namep, const char *stem, int *unit) 75165374Sphk{ 75265374Sphk int u, i; 75365374Sphk 75475519Sbrian i = strlen(stem); 75575519Sbrian if (bcmp(stem, name, i) != 0) 75665374Sphk return (0); 75765374Sphk if (!isdigit(name[i])) 75865374Sphk return (0); 75965374Sphk u = 0; 76086461Sphk if (name[i] == '0' && isdigit(name[i+1])) 76186461Sphk return (0); 76265374Sphk while (isdigit(name[i])) { 76365374Sphk u *= 10; 76465374Sphk u += name[i++] - '0'; 76565374Sphk } 766104523Sgreen if (u > 0xffffff) 767104523Sgreen return (0); 76865374Sphk *unit = u; 76965374Sphk if (namep) 77065374Sphk *namep = &name[i]; 77165374Sphk if (name[i]) 77265374Sphk return (2); 77365374Sphk return (1); 77465374Sphk} 77565632Sphk 77665632Sphk/* 777126077Sphk * Helper functions for cloning device drivers. 778126077Sphk * 779126077Sphk * The objective here is to make it unnecessary for the device drivers to 780126077Sphk * use rman or similar to manage their unit number space. Due to the way 781126077Sphk * we do "on-demand" devices, using rman or other "private" methods 782126077Sphk * will be very tricky to lock down properly once we lock down this file. 783126077Sphk * 784130936Sle * Instead we give the drivers these routines which puts the struct cdev *'s 785130936Sle * that are to be managed on their own list, and gives the driver the ability 786126077Sphk * to ask for the first free unit number or a given specified unit number. 787126077Sphk * 788126077Sphk * In addition these routines support paired devices (pty, nmdm and similar) 789126077Sphk * by respecting a number of "flag" bits in the minor number. 790126077Sphk * 791126077Sphk */ 792126077Sphk 793126077Sphkstruct clonedevs { 794126077Sphk LIST_HEAD(,cdev) head; 795126077Sphk}; 796126077Sphk 797126845Sphkvoid 798126845Sphkclone_setup(struct clonedevs **cdp) 799126845Sphk{ 800126845Sphk 801126845Sphk *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 802126845Sphk LIST_INIT(&(*cdp)->head); 803126845Sphk} 804126845Sphk 805126077Sphkint 806130585Sphkclone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 807126077Sphk{ 808126077Sphk struct clonedevs *cd; 809140733Sphk struct cdev *dev, *ndev, *dl, *de; 810126077Sphk int unit, low, u; 811126077Sphk 812126845Sphk KASSERT(*cdp != NULL, 813126845Sphk ("clone_setup() not called in driver \"%s\"", csw->d_name)); 814126077Sphk KASSERT(!(extra & CLONE_UNITMASK), 815126845Sphk ("Illegal extra bits (0x%x) in clone_create", extra)); 816126077Sphk KASSERT(*up <= CLONE_UNITMASK, 817126845Sphk ("Too high unit (0x%x) in clone_create", *up)); 818126077Sphk 819142726Sphk if (!(csw->d_flags & D_INIT)) 820142726Sphk prep_cdevsw(csw); 821126077Sphk 822126077Sphk /* 823126077Sphk * Search the list for a lot of things in one go: 824126077Sphk * A preexisting match is returned immediately. 825126077Sphk * The lowest free unit number if we are passed -1, and the place 826126077Sphk * in the list where we should insert that new element. 827126077Sphk * The place to insert a specified unit number, if applicable 828126077Sphk * the end of the list. 829126077Sphk */ 830126077Sphk unit = *up; 831150342Sphk ndev = devfs_alloc(); 832140733Sphk dev_lock(); 833126849Sphk low = extra; 834126077Sphk de = dl = NULL; 835126845Sphk cd = *cdp; 836126077Sphk LIST_FOREACH(dev, &cd->head, si_clone) { 837140733Sphk KASSERT(dev->si_flags & SI_CLONELIST, 838140733Sphk ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 839126077Sphk u = dev2unit(dev); 840126077Sphk if (u == (unit | extra)) { 841126077Sphk *dp = dev; 842150342Sphk devfs_free(ndev); 843140733Sphk dev_unlock(); 844126077Sphk return (0); 845126077Sphk } 846126077Sphk if (unit == -1 && u == low) { 847126077Sphk low++; 848126077Sphk de = dev; 849126077Sphk continue; 850150793Sphk } else if (u < (unit | extra)) { 851150793Sphk de = dev; 852150793Sphk continue; 853150793Sphk } else if (u > (unit | extra)) { 854126077Sphk dl = dev; 855126077Sphk break; 856126077Sphk } 857126077Sphk } 858126077Sphk if (unit == -1) 859126849Sphk unit = low & CLONE_UNITMASK; 860144281Sphk dev = newdev(csw, unit2minor(unit | extra), ndev); 861140733Sphk if (dev->si_flags & SI_CLONELIST) { 862140733Sphk printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 863150793Sphk printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 864140733Sphk LIST_FOREACH(dev, &cd->head, si_clone) { 865140733Sphk printf("\t%p %s\n", dev, dev->si_name); 866140733Sphk } 867140733Sphk panic("foo"); 868140733Sphk } 869126077Sphk KASSERT(!(dev->si_flags & SI_CLONELIST), 870140733Sphk ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 871126077Sphk if (dl != NULL) 872126077Sphk LIST_INSERT_BEFORE(dl, dev, si_clone); 873126077Sphk else if (de != NULL) 874126077Sphk LIST_INSERT_AFTER(de, dev, si_clone); 875126077Sphk else 876126077Sphk LIST_INSERT_HEAD(&cd->head, dev, si_clone); 877126077Sphk dev->si_flags |= SI_CLONELIST; 878126077Sphk *up = unit; 879140733Sphk dev_unlock(); 880126077Sphk return (1); 881126077Sphk} 882126077Sphk 883126077Sphk/* 884126077Sphk * Kill everything still on the list. The driver should already have 885130585Sphk * disposed of any softc hung of the struct cdev *'s at this time. 886126077Sphk */ 887126077Sphkvoid 888126077Sphkclone_cleanup(struct clonedevs **cdp) 889126077Sphk{ 890130585Sphk struct cdev *dev, *tdev; 891126077Sphk struct clonedevs *cd; 892126077Sphk 893126077Sphk cd = *cdp; 894126077Sphk if (cd == NULL) 895126077Sphk return; 896140733Sphk dev_lock(); 897126077Sphk LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 898140733Sphk KASSERT(dev->si_flags & SI_CLONELIST, 899140733Sphk ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 900126077Sphk KASSERT(dev->si_flags & SI_NAMED, 901143631Sphk ("Driver has goofed in cloning underways udev %x", dev->si_drv0)); 902142242Sphk destroy_devl(dev); 903126077Sphk } 904140733Sphk dev_unlock(); 905126077Sphk free(cd, M_DEVBUF); 906126077Sphk *cdp = NULL; 907126077Sphk} 908