kern_conf.c revision 142702
1167802Sjkim/*- 2167802Sjkim * Copyright (c) 1999-2002 Poul-Henning Kamp 3167802Sjkim * All rights reserved. 4167802Sjkim * 5167802Sjkim * Redistribution and use in source and binary forms, with or without 6167802Sjkim * modification, are permitted provided that the following conditions 7217365Sjkim * are met: 8217365Sjkim * 1. Redistributions of source code must retain the above copyright 9167802Sjkim * notice, this list of conditions and the following disclaimer. 10167802Sjkim * 2. Redistributions in binary form must reproduce the above copyright 11217365Sjkim * notice, this list of conditions and the following disclaimer in the 12217365Sjkim * documentation and/or other materials provided with the distribution. 13217365Sjkim * 14217365Sjkim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15217365Sjkim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16217365Sjkim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17217365Sjkim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18217365Sjkim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19217365Sjkim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20217365Sjkim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21217365Sjkim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22217365Sjkim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23217365Sjkim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24217365Sjkim * SUCH DAMAGE. 25167802Sjkim */ 26217365Sjkim 27217365Sjkim#include <sys/cdefs.h> 28217365Sjkim__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 142702 2005-02-27 21:52:42Z phk $"); 29167802Sjkim 30217365Sjkim#include <sys/param.h> 31217365Sjkim#include <sys/kernel.h> 32217365Sjkim#include <sys/systm.h> 33217365Sjkim#include <sys/bio.h> 34217365Sjkim#include <sys/lock.h> 35217365Sjkim#include <sys/mutex.h> 36217365Sjkim#include <sys/sysctl.h> 37217365Sjkim#include <sys/module.h> 38217365Sjkim#include <sys/malloc.h> 39217365Sjkim#include <sys/conf.h> 40217365Sjkim#include <sys/vnode.h> 41217365Sjkim#include <sys/queue.h> 42217365Sjkim#include <sys/poll.h> 43167802Sjkim#include <sys/ctype.h> 44167802Sjkim#include <sys/tty.h> 45193529Sjkim#include <machine/stdarg.h> 46193529Sjkim 47193529Sjkimstatic MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 48193529Sjkim 49193529Sjkim/* Built at compile time from sys/conf/majors */ 50193529Sjkimextern unsigned char reserved_majors[256]; 51193529Sjkim 52193529Sjkim/* 53167802Sjkim * This is the number of hash-buckets. Experiments with 'real-life' 54167802Sjkim * dev_t's show that a prime halfway between two powers of two works 55167802Sjkim * best. 56167802Sjkim */ 57167802Sjkim#define DEVT_HASH 83 58167802Sjkim 59167802Sjkimstatic LIST_HEAD(, cdev) dev_hash[DEVT_HASH]; 60167802Sjkim 61167802Sjkimstatic struct mtx devmtx; 62167802Sjkimstatic void freedev(struct cdev *dev); 63167802Sjkimstatic struct cdev *newdev(int x, int y, struct cdev *); 64167802Sjkimstatic void destroy_devl(struct cdev *dev); 65167802Sjkim 66167802Sjkimvoid 67167802Sjkimdev_lock(void) 68167802Sjkim{ 69167802Sjkim if (!mtx_initialized(&devmtx)) 70167802Sjkim mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 71167802Sjkim mtx_lock(&devmtx); 72167802Sjkim} 73167802Sjkim 74167802Sjkimvoid 75167802Sjkimdev_unlock(void) 76167802Sjkim{ 77167802Sjkim 78167802Sjkim mtx_unlock(&devmtx); 79167802Sjkim} 80167802Sjkim 81167802Sjkimvoid 82167802Sjkimdev_ref(struct cdev *dev) 83167802Sjkim{ 84167802Sjkim 85167802Sjkim mtx_assert(&devmtx, MA_OWNED); 86167802Sjkim dev->si_refcount++; 87167802Sjkim} 88167802Sjkim 89167802Sjkimvoid 90167802Sjkimdev_rel(struct cdev *dev) 91167802Sjkim{ 92167802Sjkim int flag = 0; 93167802Sjkim 94167802Sjkim mtx_assert(&devmtx, MA_NOTOWNED); 95167802Sjkim dev_lock(); 96167802Sjkim dev->si_refcount--; 97167802Sjkim KASSERT(dev->si_refcount >= 0, 98167802Sjkim ("dev_rel(%s) gave negative count", devtoname(dev))); 99167802Sjkim if (dev->si_usecount == 0 && 100167802Sjkim (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 101167802Sjkim if (dev->si_devsw == NULL && dev->si_refcount == 0) { 102167802Sjkim LIST_REMOVE(dev, si_list); 103167802Sjkim flag = 1; 104167802Sjkim } 105167802Sjkim dev_unlock(); 106167802Sjkim if (flag) 107167802Sjkim freedev(dev); 108167802Sjkim} 109167802Sjkim 110167802Sjkimstruct cdevsw * 111167802Sjkimdev_refthread(struct cdev *dev) 112167802Sjkim{ 113167802Sjkim struct cdevsw *csw; 114198237Sjkim 115167802Sjkim mtx_assert(&devmtx, MA_NOTOWNED); 116167802Sjkim dev_lock(); 117167802Sjkim csw = dev->si_devsw; 118167802Sjkim if (csw != NULL) 119167802Sjkim dev->si_threadcount++; 120167802Sjkim dev_unlock(); 121167802Sjkim return (csw); 122167802Sjkim} 123167802Sjkim 124167802Sjkimvoid 125167802Sjkimdev_relthread(struct cdev *dev) 126167802Sjkim{ 127167802Sjkim 128167802Sjkim mtx_assert(&devmtx, MA_NOTOWNED); 129167802Sjkim dev_lock(); 130167802Sjkim dev->si_threadcount--; 131167802Sjkim dev_unlock(); 132167802Sjkim} 133167802Sjkim 134167802Sjkimint 135167802Sjkimnullop(void) 136167802Sjkim{ 137167802Sjkim 138167802Sjkim return (0); 139167802Sjkim} 140167802Sjkim 141167802Sjkimint 142167802Sjkimeopnotsupp(void) 143167802Sjkim{ 144167802Sjkim 145167802Sjkim return (EOPNOTSUPP); 146167802Sjkim} 147167802Sjkim 148198237Sjkimstatic int 149167802Sjkimenxio(void) 150167802Sjkim{ 151167802Sjkim return (ENXIO); 152167802Sjkim} 153167802Sjkim 154167802Sjkimstatic int 155167802Sjkimenodev(void) 156167802Sjkim{ 157167802Sjkim return (ENODEV); 158167802Sjkim} 159167802Sjkim 160167802Sjkim/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 161167802Sjkim 162167802Sjkim#define dead_open (d_open_t *)enxio 163167802Sjkim#define dead_close (d_close_t *)enxio 164167802Sjkim#define dead_read (d_read_t *)enxio 165167802Sjkim#define dead_write (d_write_t *)enxio 166167802Sjkim#define dead_ioctl (d_ioctl_t *)enxio 167167802Sjkim#define dead_poll (d_poll_t *)enodev 168167802Sjkim#define dead_mmap (d_mmap_t *)enodev 169167802Sjkim 170167802Sjkimstatic void 171167802Sjkimdead_strategy(struct bio *bp) 172167802Sjkim{ 173167802Sjkim 174167802Sjkim biofinish(bp, NULL, ENXIO); 175167802Sjkim} 176167802Sjkim 177167802Sjkim#define dead_dump (dumper_t *)enxio 178167802Sjkim#define dead_kqfilter (d_kqfilter_t *)enxio 179167802Sjkim 180167802Sjkimstatic struct cdevsw dead_cdevsw = { 181167802Sjkim .d_version = D_VERSION, 182193529Sjkim .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 183167802Sjkim .d_open = dead_open, 184167802Sjkim .d_close = dead_close, 185167802Sjkim .d_read = dead_read, 186167802Sjkim .d_write = dead_write, 187167802Sjkim .d_ioctl = dead_ioctl, 188167802Sjkim .d_poll = dead_poll, 189167802Sjkim .d_mmap = dead_mmap, 190167802Sjkim .d_strategy = dead_strategy, 191167802Sjkim .d_name = "dead", 192167802Sjkim .d_maj = 255, 193167802Sjkim .d_dump = dead_dump, 194193529Sjkim .d_kqfilter = dead_kqfilter 195193529Sjkim}; 196167802Sjkim 197167802Sjkim/* Default methods if driver does not specify method */ 198167802Sjkim 199167802Sjkim#define null_open (d_open_t *)nullop 200167802Sjkim#define null_close (d_close_t *)nullop 201167802Sjkim#define no_read (d_read_t *)enodev 202167802Sjkim#define no_write (d_write_t *)enodev 203167802Sjkim#define no_ioctl (d_ioctl_t *)enodev 204167802Sjkim#define no_mmap (d_mmap_t *)enodev 205167802Sjkim#define no_kqfilter (d_kqfilter_t *)enodev 206167802Sjkim 207167802Sjkimstatic void 208167802Sjkimno_strategy(struct bio *bp) 209193529Sjkim{ 210167802Sjkim 211167802Sjkim biofinish(bp, NULL, ENODEV); 212167802Sjkim} 213167802Sjkim 214167802Sjkimstatic int 215167802Sjkimno_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 216167802Sjkim{ 217167802Sjkim /* 218167802Sjkim * Return true for read/write. If the user asked for something 219167802Sjkim * special, return POLLNVAL, so that clients have a way of 220167802Sjkim * determining reliably whether or not the extended 221167802Sjkim * functionality is present without hard-coding knowledge 222167802Sjkim * of specific filesystem implementations. 223167802Sjkim * Stay in sync with vop_nopoll(). 224167802Sjkim */ 225167802Sjkim if (events & ~POLLSTANDARD) 226167802Sjkim return (POLLNVAL); 227167802Sjkim 228167802Sjkim return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 229167802Sjkim} 230167802Sjkim 231167802Sjkim#define no_dump (dumper_t *)enodev 232167802Sjkim 233167802Sjkim/* 234167802Sjkim * struct cdev * and u_dev_t primitives 235167802Sjkim */ 236193529Sjkim 237167802Sjkimint 238167802Sjkimmajor(struct cdev *x) 239167802Sjkim{ 240167802Sjkim if (x == NULL) 241167802Sjkim return NODEV; 242167802Sjkim return((x->si_udev >> 8) & 0xff); 243167802Sjkim} 244167802Sjkim 245167802Sjkimint 246167802Sjkimminor(struct cdev *x) 247193529Sjkim{ 248193529Sjkim if (x == NULL) 249167802Sjkim return NODEV; 250167802Sjkim return(x->si_udev & MAXMINOR); 251167802Sjkim} 252167802Sjkim 253167802Sjkimint 254167802Sjkimdev2unit(struct cdev *x) 255167802Sjkim{ 256167802Sjkim 257167802Sjkim if (x == NULL) 258167802Sjkim return NODEV; 259167802Sjkim return (minor2unit(minor(x))); 260167802Sjkim} 261167802Sjkim 262193529Sjkimint 263167802Sjkimminor2unit(int _minor) 264167802Sjkim{ 265167802Sjkim 266167802Sjkim KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 267167802Sjkim return ((_minor & 0xff) | (_minor >> 8)); 268167802Sjkim} 269167802Sjkim 270167802Sjkimint 271167802Sjkimunit2minor(int unit) 272167802Sjkim{ 273167802Sjkim 274167802Sjkim KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 275167802Sjkim return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 276167802Sjkim} 277167802Sjkim 278167802Sjkimstatic struct cdev * 279167802Sjkimallocdev(void) 280167802Sjkim{ 281167802Sjkim struct cdev *si; 282167802Sjkim 283167802Sjkim si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK); 284167802Sjkim si->si_name = si->__si_namebuf; 285167802Sjkim LIST_INIT(&si->si_children); 286167802Sjkim LIST_INIT(&si->si_alist); 287167802Sjkim return (si); 288167802Sjkim} 289167802Sjkim 290167802Sjkimstatic struct cdev * 291167802Sjkimnewdev(int x, int y, struct cdev *si) 292167802Sjkim{ 293167802Sjkim struct cdev *si2; 294167802Sjkim dev_t udev; 295167802Sjkim int hash; 296167802Sjkim 297167802Sjkim mtx_assert(&devmtx, MA_OWNED); 298167802Sjkim if (x == umajor(NODEV) && y == uminor(NODEV)) 299167802Sjkim panic("newdev of NODEV"); 300167802Sjkim udev = (x << 8) | y; 301167802Sjkim hash = udev % DEVT_HASH; 302167802Sjkim LIST_FOREACH(si2, &dev_hash[hash], si_hash) { 303167802Sjkim if (si2->si_udev == udev) { 304167802Sjkim freedev(si); 305167802Sjkim return (si2); 306167802Sjkim } 307167802Sjkim } 308167802Sjkim si->si_udev = udev; 309167802Sjkim LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); 310167802Sjkim return (si); 311167802Sjkim} 312167802Sjkim 313167802Sjkimstatic void 314167802Sjkimfreedev(struct cdev *dev) 315167802Sjkim{ 316167802Sjkim 317167802Sjkim free(dev, M_DEVT); 318167802Sjkim} 319167802Sjkim 320167802Sjkimdev_t 321167802Sjkimdev2udev(struct cdev *x) 322167802Sjkim{ 323167802Sjkim if (x == NULL) 324167802Sjkim return (NODEV); 325167802Sjkim return (x->si_udev); 326167802Sjkim} 327167802Sjkim 328167802Sjkimstruct cdev * 329167802Sjkimfindcdev(dev_t udev) 330167802Sjkim{ 331167802Sjkim struct cdev *si; 332167802Sjkim int hash; 333167802Sjkim 334167802Sjkim mtx_assert(&devmtx, MA_NOTOWNED); 335167802Sjkim if (udev == NODEV) 336167802Sjkim return (NULL); 337167802Sjkim dev_lock(); 338167802Sjkim hash = udev % DEVT_HASH; 339167802Sjkim LIST_FOREACH(si, &dev_hash[hash], si_hash) { 340167802Sjkim if (si->si_udev == udev) 341167802Sjkim break; 342167802Sjkim } 343167802Sjkim dev_unlock(); 344167802Sjkim return (si); 345167802Sjkim} 346167802Sjkim 347167802Sjkimint 348167802Sjkimuminor(dev_t dev) 349167802Sjkim{ 350167802Sjkim return (dev & MAXMINOR); 351167802Sjkim} 352167802Sjkim 353167802Sjkimint 354167802Sjkimumajor(dev_t dev) 355167802Sjkim{ 356167802Sjkim return ((dev & ~MAXMINOR) >> 8); 357167802Sjkim} 358167802Sjkim 359167802Sjkimstatic void 360167802Sjkimfind_major(struct cdevsw *devsw) 361167802Sjkim{ 362167802Sjkim int i; 363167802Sjkim 364167802Sjkim for (i = NUMCDEVSW - 1; i > 0; i--) 365167802Sjkim if (reserved_majors[i] != i) 366198237Sjkim break; 367167802Sjkim KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); 368167802Sjkim devsw->d_maj = i; 369167802Sjkim reserved_majors[i] = i; 370167802Sjkim devsw->d_flags |= D_ALLOCMAJ; 371167802Sjkim} 372167802Sjkim 373167802Sjkimstatic void 374167802Sjkimfini_cdevsw(struct cdevsw *devsw) 375167802Sjkim{ 376167802Sjkim if (devsw->d_flags & D_ALLOCMAJ) { 377167802Sjkim reserved_majors[devsw->d_maj] = 0; 378167802Sjkim devsw->d_maj = MAJOR_AUTO; 379167802Sjkim devsw->d_flags &= ~D_ALLOCMAJ; 380167802Sjkim } 381167802Sjkim devsw->d_flags &= ~D_INIT; 382167802Sjkim} 383167802Sjkim 384167802Sjkimstatic void 385167802Sjkimprep_cdevsw(struct cdevsw *devsw) 386167802Sjkim{ 387167802Sjkim 388167802Sjkim dev_lock(); 389167802Sjkim 390167802Sjkim if (devsw->d_version != D_VERSION_00) { 391167802Sjkim printf( 392167802Sjkim "WARNING: Device driver \"%s\" has wrong version %s\n", 393167802Sjkim devsw->d_name, "and is disabled. Recompile KLD module."); 394167802Sjkim devsw->d_open = dead_open; 395167802Sjkim devsw->d_close = dead_close; 396167802Sjkim devsw->d_read = dead_read; 397167802Sjkim devsw->d_write = dead_write; 398167802Sjkim devsw->d_ioctl = dead_ioctl; 399198237Sjkim devsw->d_poll = dead_poll; 400167802Sjkim devsw->d_mmap = dead_mmap; 401193529Sjkim devsw->d_strategy = dead_strategy; 402193529Sjkim devsw->d_dump = dead_dump; 403193529Sjkim devsw->d_kqfilter = dead_kqfilter; 404167802Sjkim } 405167802Sjkim 406167802Sjkim if (devsw->d_flags & D_TTY) { 407167802Sjkim if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 408167802Sjkim if (devsw->d_read == NULL) devsw->d_read = ttyread; 409167802Sjkim if (devsw->d_write == NULL) devsw->d_write = ttywrite; 410167802Sjkim if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 411167802Sjkim if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 412167802Sjkim } 413167802Sjkim 414167802Sjkim if (devsw->d_open == NULL) devsw->d_open = null_open; 415167802Sjkim if (devsw->d_close == NULL) devsw->d_close = null_close; 416167802Sjkim if (devsw->d_read == NULL) devsw->d_read = no_read; 417167802Sjkim if (devsw->d_write == NULL) devsw->d_write = no_write; 418167802Sjkim if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 419167802Sjkim if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 420167802Sjkim if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 421167802Sjkim if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 422167802Sjkim if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 423167802Sjkim if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 424167802Sjkim 425167802Sjkim LIST_INIT(&devsw->d_devs); 426167802Sjkim 427167802Sjkim devsw->d_flags |= D_INIT; 428167802Sjkim 429167802Sjkim if (devsw->d_maj == MAJOR_AUTO) { 430167802Sjkim find_major(devsw); 431167802Sjkim } else { 432167802Sjkim KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256, 433167802Sjkim ("Invalid major (%d) in make_dev", devsw->d_maj)); 434167802Sjkim if (reserved_majors[devsw->d_maj] != devsw->d_maj) { 435167802Sjkim printf("WARNING: driver \"%s\" used %s %d\n", 436167802Sjkim devsw->d_name, "unreserved major device number", 437167802Sjkim devsw->d_maj); 438167802Sjkim reserved_majors[devsw->d_maj] = devsw->d_maj; 439167802Sjkim } 440167802Sjkim } 441167802Sjkim dev_unlock(); 442167802Sjkim} 443167802Sjkim 444167802Sjkimstruct cdev * 445167802Sjkimmake_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...) 446167802Sjkim{ 447167802Sjkim struct cdev *dev; 448167802Sjkim va_list ap; 449167802Sjkim int i; 450167802Sjkim 451167802Sjkim KASSERT((minornr & ~MAXMINOR) == 0, 452167802Sjkim ("Invalid minor (0x%x) in make_dev", minornr)); 453167802Sjkim 454167802Sjkim if (!(devsw->d_flags & D_INIT)) 455167802Sjkim prep_cdevsw(devsw); 456167802Sjkim dev = allocdev(); 457167802Sjkim dev_lock(); 458167802Sjkim dev = newdev(devsw->d_maj, minornr, dev); 459167802Sjkim if (dev->si_flags & SI_CHEAPCLONE && 460167802Sjkim dev->si_flags & SI_NAMED && 461167802Sjkim dev->si_devsw == devsw) { 462167802Sjkim /* 463198237Sjkim * This is allowed as it removes races and generally 464167802Sjkim * simplifies cloning devices. 465167802Sjkim * XXX: still ?? 466167802Sjkim */ 467167802Sjkim dev_unlock(); 468209746Sjkim return (dev); 469167802Sjkim } 470167802Sjkim KASSERT(!(dev->si_flags & SI_NAMED), 471167802Sjkim ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)", 472167802Sjkim devsw->d_name, major(dev), minor(dev), devtoname(dev))); 473167802Sjkim 474198237Sjkim va_start(ap, fmt); 475167802Sjkim i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 476167802Sjkim if (i > (sizeof dev->__si_namebuf - 1)) { 477167802Sjkim printf("WARNING: Device name truncated! (%s)\n", 478198237Sjkim dev->__si_namebuf); 479167802Sjkim } 480167802Sjkim va_end(ap); 481167802Sjkim 482167802Sjkim dev->si_devsw = devsw; 483167802Sjkim dev->si_uid = uid; 484167802Sjkim dev->si_gid = gid; 485167802Sjkim dev->si_mode = perms; 486167802Sjkim dev->si_flags |= SI_NAMED; 487167802Sjkim 488167802Sjkim LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list); 489167802Sjkim devfs_create(dev); 490167802Sjkim dev_unlock(); 491167802Sjkim return (dev); 492167802Sjkim} 493167802Sjkim 494198237Sjkimint 495167802Sjkimdev_named(struct cdev *pdev, const char *name) 496167802Sjkim{ 497167802Sjkim struct cdev *cdev; 498167802Sjkim 499167802Sjkim if (strcmp(devtoname(pdev), name) == 0) 500167802Sjkim return (1); 501167802Sjkim LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 502167802Sjkim if (strcmp(devtoname(cdev), name) == 0) 503198237Sjkim return (1); 504167802Sjkim return (0); 505167802Sjkim} 506167802Sjkim 507198237Sjkimvoid 508167802Sjkimdev_depends(struct cdev *pdev, struct cdev *cdev) 509167802Sjkim{ 510167802Sjkim 511167802Sjkim dev_lock(); 512167802Sjkim cdev->si_parent = pdev; 513167802Sjkim cdev->si_flags |= SI_CHILD; 514167802Sjkim LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 515167802Sjkim dev_unlock(); 516167802Sjkim} 517167802Sjkim 518167802Sjkimstruct cdev * 519167802Sjkimmake_dev_alias(struct cdev *pdev, const char *fmt, ...) 520167802Sjkim{ 521167802Sjkim struct cdev *dev; 522167802Sjkim va_list ap; 523167802Sjkim int i; 524167802Sjkim 525167802Sjkim dev = allocdev(); 526167802Sjkim dev_lock(); 527167802Sjkim dev->si_flags |= SI_ALIAS; 528167802Sjkim dev->si_flags |= SI_NAMED; 529167802Sjkim va_start(ap, fmt); 530167802Sjkim i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 531167802Sjkim if (i > (sizeof dev->__si_namebuf - 1)) { 532167802Sjkim printf("WARNING: Device name truncated! (%s)\n", 533167802Sjkim dev->__si_namebuf); 534167802Sjkim } 535167802Sjkim va_end(ap); 536167802Sjkim 537167802Sjkim devfs_create(dev); 538198237Sjkim dev_unlock(); 539167802Sjkim dev_depends(pdev, dev); 540167802Sjkim return (dev); 541167802Sjkim} 542167802Sjkim 543167802Sjkimstatic void 544167802Sjkimdestroy_devl(struct cdev *dev) 545167802Sjkim{ 546167802Sjkim struct cdevsw *csw; 547167802Sjkim 548198237Sjkim mtx_assert(&devmtx, MA_OWNED); 549167802Sjkim KASSERT(dev->si_flags & SI_NAMED, 550167802Sjkim ("WARNING: Driver mistake: destroy_dev on %d/%d\n", 551167802Sjkim major(dev), minor(dev))); 552193529Sjkim 553193529Sjkim devfs_destroy(dev); 554193529Sjkim 555167802Sjkim /* Remove name marking */ 556167802Sjkim dev->si_flags &= ~SI_NAMED; 557167802Sjkim 558167802Sjkim /* If we are a child, remove us from the parents list */ 559167802Sjkim if (dev->si_flags & SI_CHILD) { 560167802Sjkim LIST_REMOVE(dev, si_siblings); 561167802Sjkim dev->si_flags &= ~SI_CHILD; 562167802Sjkim } 563167802Sjkim 564167802Sjkim /* Kill our children */ 565167802Sjkim while (!LIST_EMPTY(&dev->si_children)) 566167802Sjkim destroy_devl(LIST_FIRST(&dev->si_children)); 567167802Sjkim 568167802Sjkim /* Remove from clone list */ 569167802Sjkim if (dev->si_flags & SI_CLONELIST) { 570167802Sjkim LIST_REMOVE(dev, si_clone); 571167802Sjkim dev->si_flags &= ~SI_CLONELIST; 572167802Sjkim } 573167802Sjkim 574167802Sjkim csw = dev->si_devsw; 575167802Sjkim dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 576167802Sjkim while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 577167802Sjkim printf("Purging %lu threads from %s\n", 578167802Sjkim dev->si_threadcount, devtoname(dev)); 579167802Sjkim csw->d_purge(dev); 580167802Sjkim msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 581167802Sjkim } 582167802Sjkim if (csw != NULL && csw->d_purge != NULL) 583167802Sjkim printf("All threads purged from %s\n", devtoname(dev)); 584167802Sjkim 585167802Sjkim dev->si_drv1 = 0; 586167802Sjkim dev->si_drv2 = 0; 587193529Sjkim bzero(&dev->__si_u, sizeof(dev->__si_u)); 588193529Sjkim 589193529Sjkim if (!(dev->si_flags & SI_ALIAS)) { 590167802Sjkim /* Remove from cdevsw list */ 591167802Sjkim LIST_REMOVE(dev, si_list); 592167802Sjkim 593167802Sjkim /* If cdevsw has no struct cdev *'s, clean it */ 594167802Sjkim if (LIST_EMPTY(&csw->d_devs)) 595167802Sjkim fini_cdevsw(csw); 596167802Sjkim 597167802Sjkim LIST_REMOVE(dev, si_hash); 598167802Sjkim } 599167802Sjkim dev->si_flags &= ~SI_ALIAS; 600167802Sjkim 601167802Sjkim if (dev->si_refcount > 0) { 602167802Sjkim LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 603167802Sjkim } else { 604167802Sjkim freedev(dev); 605167802Sjkim } 606167802Sjkim} 607167802Sjkim 608167802Sjkimvoid 609167802Sjkimdestroy_dev(struct cdev *dev) 610167802Sjkim{ 611167802Sjkim 612193529Sjkim dev_lock(); 613193529Sjkim destroy_devl(dev); 614193529Sjkim dev_unlock(); 615193529Sjkim} 616193529Sjkim 617193529Sjkimconst char * 618193529Sjkimdevtoname(struct cdev *dev) 619167802Sjkim{ 620167802Sjkim char *p; 621167802Sjkim struct cdevsw *csw; 622167802Sjkim int mynor; 623167802Sjkim 624167802Sjkim if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 625167802Sjkim p = dev->si_name; 626167802Sjkim sprintf(p, "#%d", major(dev)); 627167802Sjkim p += strlen(p); 628167802Sjkim csw = dev_refthread(dev); 629167802Sjkim if (csw != NULL) { 630167802Sjkim sprintf(p, "(%s)", csw->d_name); 631167802Sjkim dev_relthread(dev); 632167802Sjkim } 633167802Sjkim p += strlen(p); 634167802Sjkim mynor = minor(dev); 635167802Sjkim if (mynor < 0 || mynor > 255) 636167802Sjkim sprintf(p, "/%#x", (u_int)mynor); 637167802Sjkim else 638167802Sjkim sprintf(p, "/%d", mynor); 639167802Sjkim } 640167802Sjkim return (dev->si_name); 641167802Sjkim} 642167802Sjkim 643167802Sjkimint 644167802Sjkimdev_stdclone(char *name, char **namep, const char *stem, int *unit) 645167802Sjkim{ 646193529Sjkim int u, i; 647193529Sjkim 648193529Sjkim i = strlen(stem); 649167802Sjkim if (bcmp(stem, name, i) != 0) 650193529Sjkim return (0); 651193529Sjkim if (!isdigit(name[i])) 652193529Sjkim return (0); 653193529Sjkim u = 0; 654193529Sjkim if (name[i] == '0' && isdigit(name[i+1])) 655193529Sjkim return (0); 656193529Sjkim while (isdigit(name[i])) { 657193529Sjkim u *= 10; 658193529Sjkim u += name[i++] - '0'; 659193529Sjkim } 660193529Sjkim if (u > 0xffffff) 661193529Sjkim return (0); 662193529Sjkim *unit = u; 663193529Sjkim if (namep) 664193529Sjkim *namep = &name[i]; 665193529Sjkim if (name[i]) 666193529Sjkim return (2); 667193529Sjkim return (1); 668193529Sjkim} 669193529Sjkim 670193529Sjkim/* 671193529Sjkim * Helper functions for cloning device drivers. 672193529Sjkim * 673193529Sjkim * The objective here is to make it unnecessary for the device drivers to 674193529Sjkim * use rman or similar to manage their unit number space. Due to the way 675193529Sjkim * we do "on-demand" devices, using rman or other "private" methods 676193529Sjkim * will be very tricky to lock down properly once we lock down this file. 677167802Sjkim * 678167802Sjkim * Instead we give the drivers these routines which puts the struct cdev *'s 679167802Sjkim * that are to be managed on their own list, and gives the driver the ability 680167802Sjkim * to ask for the first free unit number or a given specified unit number. 681167802Sjkim * 682167802Sjkim * In addition these routines support paired devices (pty, nmdm and similar) 683167802Sjkim * by respecting a number of "flag" bits in the minor number. 684167802Sjkim * 685167802Sjkim */ 686167802Sjkim 687167802Sjkimstruct clonedevs { 688167802Sjkim LIST_HEAD(,cdev) head; 689167802Sjkim}; 690167802Sjkim 691167802Sjkimvoid 692167802Sjkimclone_setup(struct clonedevs **cdp) 693167802Sjkim{ 694167802Sjkim 695167802Sjkim *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 696167802Sjkim LIST_INIT(&(*cdp)->head); 697167802Sjkim} 698167802Sjkim 699167802Sjkimint 700167802Sjkimclone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 701167802Sjkim{ 702167802Sjkim struct clonedevs *cd; 703167802Sjkim struct cdev *dev, *ndev, *dl, *de; 704167802Sjkim int unit, low, u; 705167802Sjkim 706167802Sjkim KASSERT(*cdp != NULL, 707167802Sjkim ("clone_setup() not called in driver \"%s\"", csw->d_name)); 708167802Sjkim KASSERT(!(extra & CLONE_UNITMASK), 709167802Sjkim ("Illegal extra bits (0x%x) in clone_create", extra)); 710167802Sjkim KASSERT(*up <= CLONE_UNITMASK, 711167802Sjkim ("Too high unit (0x%x) in clone_create", *up)); 712167802Sjkim 713167802Sjkim if (csw->d_maj == MAJOR_AUTO) 714167802Sjkim find_major(csw); 715167802Sjkim 716167802Sjkim /* 717193529Sjkim * Search the list for a lot of things in one go: 718167802Sjkim * A preexisting match is returned immediately. 719167802Sjkim * The lowest free unit number if we are passed -1, and the place 720167802Sjkim * in the list where we should insert that new element. 721167802Sjkim * The place to insert a specified unit number, if applicable 722193529Sjkim * the end of the list. 723212761Sjkim */ 724167802Sjkim unit = *up; 725167802Sjkim ndev = allocdev(); 726167802Sjkim dev_lock(); 727167802Sjkim low = extra; 728167802Sjkim de = dl = NULL; 729167802Sjkim cd = *cdp; 730167802Sjkim LIST_FOREACH(dev, &cd->head, si_clone) { 731167802Sjkim KASSERT(dev->si_flags & SI_CLONELIST, 732167802Sjkim ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 733167802Sjkim u = dev2unit(dev); 734167802Sjkim if (u == (unit | extra)) { 735167802Sjkim *dp = dev; 736167802Sjkim freedev(ndev); 737167802Sjkim dev_unlock(); 738167802Sjkim return (0); 739167802Sjkim } 740167802Sjkim if (unit == -1 && u == low) { 741167802Sjkim low++; 742167802Sjkim de = dev; 743167802Sjkim continue; 744167802Sjkim } 745167802Sjkim if (u > (unit | extra)) { 746167802Sjkim dl = dev; 747167802Sjkim break; 748167802Sjkim } 749167802Sjkim } 750167802Sjkim if (unit == -1) 751167802Sjkim unit = low & CLONE_UNITMASK; 752167802Sjkim dev = newdev(csw->d_maj, unit2minor(unit | extra), ndev); 753167802Sjkim if (dev->si_flags & SI_CLONELIST) { 754167802Sjkim printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 755167802Sjkim printf("unit=%d\n", unit); 756167802Sjkim LIST_FOREACH(dev, &cd->head, si_clone) { 757167802Sjkim printf("\t%p %s\n", dev, dev->si_name); 758167802Sjkim } 759167802Sjkim panic("foo"); 760167802Sjkim } 761167802Sjkim KASSERT(!(dev->si_flags & SI_CLONELIST), 762167802Sjkim ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 763167802Sjkim if (dl != NULL) 764167802Sjkim LIST_INSERT_BEFORE(dl, dev, si_clone); 765167802Sjkim else if (de != NULL) 766167802Sjkim LIST_INSERT_AFTER(de, dev, si_clone); 767167802Sjkim else 768167802Sjkim LIST_INSERT_HEAD(&cd->head, dev, si_clone); 769167802Sjkim dev->si_flags |= SI_CLONELIST; 770167802Sjkim *up = unit; 771167802Sjkim dev_unlock(); 772167802Sjkim return (1); 773167802Sjkim} 774167802Sjkim 775167802Sjkim/* 776167802Sjkim * Kill everything still on the list. The driver should already have 777167802Sjkim * disposed of any softc hung of the struct cdev *'s at this time. 778167802Sjkim */ 779167802Sjkimvoid 780167802Sjkimclone_cleanup(struct clonedevs **cdp) 781167802Sjkim{ 782167802Sjkim struct cdev *dev, *tdev; 783167802Sjkim struct clonedevs *cd; 784167802Sjkim 785167802Sjkim cd = *cdp; 786198237Sjkim if (cd == NULL) 787167802Sjkim return; 788167802Sjkim dev_lock(); 789167802Sjkim LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 790167802Sjkim KASSERT(dev->si_flags & SI_CLONELIST, 791167802Sjkim ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 792167802Sjkim KASSERT(dev->si_flags & SI_NAMED, 793167802Sjkim ("Driver has goofed in cloning underways udev %x", dev->si_udev)); 794167802Sjkim destroy_devl(dev); 795167802Sjkim } 796167802Sjkim dev_unlock(); 797167802Sjkim free(cd, M_DEVBUF); 798167802Sjkim *cdp = NULL; 799193529Sjkim} 800193529Sjkim 801193529Sjkim/* 802193529Sjkim * Helper sysctl for devname(3). We're given a struct cdev * and return 803193529Sjkim * the name, if any, registered by the device driver. 804193529Sjkim */ 805193529Sjkimstatic int 806193529Sjkimsysctl_devname(SYSCTL_HANDLER_ARGS) 807193529Sjkim{ 808193529Sjkim int error; 809193529Sjkim dev_t ud; 810193529Sjkim struct cdev *dev; 811193529Sjkim 812212761Sjkim error = SYSCTL_IN(req, &ud, sizeof (ud)); 813212761Sjkim if (error) 814212761Sjkim return (error); 815212761Sjkim if (ud == NODEV) 816193529Sjkim return(EINVAL); 817193529Sjkim dev = findcdev(ud); 818212761Sjkim if (dev == NULL) 819193529Sjkim error = ENOENT; 820193529Sjkim else 821167802Sjkim error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1); 822167802Sjkim return (error); 823167802Sjkim} 824167802Sjkim 825167802SjkimSYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 826167802Sjkim NULL, 0, sysctl_devname, "", "devname(3) handler"); 827167802Sjkim