The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/sound.c

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    1 /*-
    2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    3  * (C) 1997 Luigi Rizzo (luigi@iet.unipi.it)
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <dev/sound/pcm/sound.h>
   29 #include <dev/sound/pcm/vchan.h>
   30 #include <dev/sound/pcm/dsp.h>
   31 #include <sys/sysctl.h>
   32 
   33 #include "feeder_if.h"
   34 
   35 SND_DECLARE_FILE("$FreeBSD: releng/6.2/sys/dev/sound/pcm/sound.c 157495 2006-04-04 17:43:49Z ariff $");
   36 
   37 devclass_t pcm_devclass;
   38 
   39 int pcm_veto_load = 1;
   40 
   41 #ifdef USING_DEVFS
   42 int snd_unit = 0;
   43 TUNABLE_INT("hw.snd.unit", &snd_unit);
   44 #endif
   45 
   46 int snd_maxautovchans = 0;
   47 TUNABLE_INT("hw.snd.maxautovchans", &snd_maxautovchans);
   48 
   49 SYSCTL_NODE(_hw, OID_AUTO, snd, CTLFLAG_RD, 0, "Sound driver");
   50 
   51 static int sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose);
   52 
   53 struct sysctl_ctx_list *
   54 snd_sysctl_tree(device_t dev)
   55 {
   56         struct snddev_info *d = device_get_softc(dev);
   57 
   58         return &d->sysctl_tree;
   59 }
   60 
   61 struct sysctl_oid *
   62 snd_sysctl_tree_top(device_t dev)
   63 {
   64         struct snddev_info *d = device_get_softc(dev);
   65 
   66         return d->sysctl_tree_top;
   67 }
   68 
   69 void *
   70 snd_mtxcreate(const char *desc, const char *type)
   71 {
   72 #ifdef USING_MUTEX
   73         struct mtx *m;
   74 
   75         m = malloc(sizeof(*m), M_DEVBUF, M_WAITOK | M_ZERO);
   76         if (m == NULL)
   77                 return NULL;
   78         mtx_init(m, desc, type, MTX_DEF);
   79         return m;
   80 #else
   81         return (void *)0xcafebabe;
   82 #endif
   83 }
   84 
   85 void
   86 snd_mtxfree(void *m)
   87 {
   88 #ifdef USING_MUTEX
   89         struct mtx *mtx = m;
   90 
   91         /* mtx_assert(mtx, MA_OWNED); */
   92         mtx_destroy(mtx);
   93         free(mtx, M_DEVBUF);
   94 #endif
   95 }
   96 
   97 void
   98 snd_mtxassert(void *m)
   99 {
  100 #ifdef USING_MUTEX
  101 #ifdef INVARIANTS
  102         struct mtx *mtx = m;
  103 
  104         mtx_assert(mtx, MA_OWNED);
  105 #endif
  106 #endif
  107 }
  108 /*
  109 void
  110 snd_mtxlock(void *m)
  111 {
  112 #ifdef USING_MUTEX
  113         struct mtx *mtx = m;
  114 
  115         mtx_lock(mtx);
  116 #endif
  117 }
  118 
  119 void
  120 snd_mtxunlock(void *m)
  121 {
  122 #ifdef USING_MUTEX
  123         struct mtx *mtx = m;
  124 
  125         mtx_unlock(mtx);
  126 #endif
  127 }
  128 */
  129 int
  130 snd_setup_intr(device_t dev, struct resource *res, int flags, driver_intr_t hand, void *param, void **cookiep)
  131 {
  132 #ifdef USING_MUTEX
  133         flags &= INTR_MPSAFE;
  134         flags |= INTR_TYPE_AV;
  135 #else
  136         flags = INTR_TYPE_AV;
  137 #endif
  138         return bus_setup_intr(dev, res, flags, hand, param, cookiep);
  139 }
  140 
  141 #ifndef PCM_DEBUG_MTX
  142 void
  143 pcm_lock(struct snddev_info *d)
  144 {
  145         snd_mtxlock(d->lock);
  146 }
  147 
  148 void
  149 pcm_unlock(struct snddev_info *d)
  150 {
  151         snd_mtxunlock(d->lock);
  152 }
  153 #endif
  154 
  155 struct pcm_channel *
  156 pcm_getfakechan(struct snddev_info *d)
  157 {
  158         return d->fakechan;
  159 }
  160 
  161 static int
  162 pcm_setvchans(struct snddev_info *d, int newcnt)
  163 {
  164         struct snddev_channel *sce = NULL;
  165         struct pcm_channel *c = NULL;
  166         int err = 0, vcnt, dcnt, i;
  167 
  168         pcm_inprog(d, 1);
  169                 
  170         if (!(d->flags & SD_F_AUTOVCHAN)) {
  171                 err = EINVAL;
  172                 goto setvchans_out;
  173         }
  174 
  175         vcnt = d->vchancount;
  176         dcnt = d->playcount + d->reccount;
  177 
  178         if (newcnt < 0 || (dcnt + newcnt) > (PCMMAXCHAN + 1)) {
  179                 err = E2BIG;
  180                 goto setvchans_out;
  181         }
  182 
  183         dcnt += vcnt;
  184 
  185         if (newcnt > vcnt) {
  186                 /* add new vchans - find a parent channel first */
  187                 SLIST_FOREACH(sce, &d->channels, link) {
  188                         c = sce->channel;
  189                         CHN_LOCK(c);
  190                         if (c->direction == PCMDIR_PLAY &&
  191                                         ((c->flags & CHN_F_HAS_VCHAN) ||
  192                                         (vcnt == 0 &&
  193                                         !(c->flags & (CHN_F_BUSY | CHN_F_VIRTUAL)))))
  194                                 goto addok;
  195                         CHN_UNLOCK(c);
  196                 }
  197                 err = EBUSY;
  198                 goto setvchans_out;
  199 addok:
  200                 c->flags |= CHN_F_BUSY;
  201                 while (err == 0 && newcnt > vcnt) {
  202                         if (dcnt > PCMMAXCHAN) {
  203                                 device_printf(d->dev, "%s: Maximum channel reached.\n", __func__);
  204                                 break;
  205                         }
  206                         err = vchan_create(c);
  207                         if (err == 0) {
  208                                 vcnt++;
  209                                 dcnt++;
  210                         } else if (err == E2BIG && newcnt > vcnt)
  211                                 device_printf(d->dev, "%s: err=%d Maximum channel reached.\n", __func__, err);
  212                 }
  213                 if (vcnt == 0)
  214                         c->flags &= ~CHN_F_BUSY;
  215                 CHN_UNLOCK(c);
  216         } else if (newcnt < vcnt) {
  217 #define ORPHAN_CDEVT(cdevt) \
  218         ((cdevt) == NULL || ((cdevt)->si_drv1 == NULL && \
  219         (cdevt)->si_drv2 == NULL))
  220                 while (err == 0 && newcnt < vcnt) {
  221                         i = 0;
  222                         SLIST_FOREACH(sce, &d->channels, link) {
  223                                 c = sce->channel;
  224                                 CHN_LOCK(c);
  225                                 if (c->direction == PCMDIR_PLAY &&
  226                                                 (c->flags & CHN_F_VIRTUAL) &&
  227                                                 (i++ == newcnt)) {
  228                                         if (!(c->flags & CHN_F_BUSY) &&
  229                                                         ORPHAN_CDEVT(sce->dsp_devt) &&
  230                                                         ORPHAN_CDEVT(sce->dspW_devt) &&
  231                                                         ORPHAN_CDEVT(sce->audio_devt) &&
  232                                                         ORPHAN_CDEVT(sce->dspr_devt))
  233                                                 goto remok;
  234                                         /*
  235                                          * Either we're busy, or our cdev
  236                                          * has been stolen by dsp_clone().
  237                                          * Skip, and increase newcnt.
  238                                          */
  239                                         if (!(c->flags & CHN_F_BUSY))
  240                                                 device_printf(d->dev,
  241                                                         "%s: <%s> somebody steal my cdev!\n",
  242                                                         __func__, c->name);
  243                                         newcnt++;
  244                                 }
  245                                 CHN_UNLOCK(c);
  246                         }
  247                         if (vcnt != newcnt)
  248                                 err = EBUSY;
  249                         break;
  250 remok:
  251                         CHN_UNLOCK(c);
  252                         err = vchan_destroy(c);
  253                         if (err == 0)
  254                                 vcnt--;
  255                         else
  256                                 device_printf(d->dev,
  257                                         "%s: WARNING: vchan_destroy() failed!",
  258                                         __func__);
  259                 }
  260         }
  261 
  262 setvchans_out:
  263         pcm_inprog(d, -1);
  264         return err;
  265 }
  266 
  267 /* return error status and a locked channel */
  268 int
  269 pcm_chnalloc(struct snddev_info *d, struct pcm_channel **ch, int direction,
  270                 pid_t pid, int chnum)
  271 {
  272         struct pcm_channel *c;
  273         struct snddev_channel *sce;
  274         int err;
  275 
  276 retry_chnalloc:
  277         err = ENODEV;
  278         /* scan for a free channel */
  279         SLIST_FOREACH(sce, &d->channels, link) {
  280                 c = sce->channel;
  281                 CHN_LOCK(c);
  282                 if (c->direction == direction && !(c->flags & CHN_F_BUSY)) {
  283                         if (chnum < 0 || sce->chan_num == chnum) {
  284                                 c->flags |= CHN_F_BUSY;
  285                                 c->pid = pid;
  286                                 *ch = c;
  287                                 return 0;
  288                         }
  289                 }
  290                 if (sce->chan_num == chnum) {
  291                         if (c->direction != direction)
  292                                 err = EOPNOTSUPP;
  293                         else if (c->flags & CHN_F_BUSY)
  294                                 err = EBUSY;
  295                         else
  296                                 err = EINVAL;
  297                         CHN_UNLOCK(c);
  298                         return err;
  299                 } else if (c->direction == direction && (c->flags & CHN_F_BUSY))
  300                         err = EBUSY;
  301                 CHN_UNLOCK(c);
  302         }
  303 
  304         /* no channel available */
  305         if (chnum == -1 && direction == PCMDIR_PLAY && d->vchancount > 0 &&
  306                         d->vchancount < snd_maxautovchans &&
  307                         d->devcount <= PCMMAXCHAN) {
  308                 err = pcm_setvchans(d, d->vchancount + 1);
  309                 if (err == 0) {
  310                         chnum = -2;
  311                         goto retry_chnalloc;
  312                 }
  313         }
  314 
  315         return err;
  316 }
  317 
  318 /* release a locked channel and unlock it */
  319 int
  320 pcm_chnrelease(struct pcm_channel *c)
  321 {
  322         CHN_LOCKASSERT(c);
  323         c->flags &= ~CHN_F_BUSY;
  324         c->pid = -1;
  325         CHN_UNLOCK(c);
  326         return 0;
  327 }
  328 
  329 int
  330 pcm_chnref(struct pcm_channel *c, int ref)
  331 {
  332         int r;
  333 
  334         CHN_LOCKASSERT(c);
  335         c->refcount += ref;
  336         r = c->refcount;
  337         return r;
  338 }
  339 
  340 int
  341 pcm_inprog(struct snddev_info *d, int delta)
  342 {
  343         int r;
  344 
  345         if (delta == 0)
  346                 return d->inprog;
  347 
  348         /* backtrace(); */
  349         pcm_lock(d);
  350         d->inprog += delta;
  351         r = d->inprog;
  352         pcm_unlock(d);
  353         return r;
  354 }
  355 
  356 static void
  357 pcm_setmaxautovchans(struct snddev_info *d, int num)
  358 {
  359         if (num > 0 && d->vchancount == 0)
  360                 pcm_setvchans(d, 1);
  361         else if (num == 0 && d->vchancount > 0)
  362                 pcm_setvchans(d, 0);
  363 }
  364 
  365 #ifdef USING_DEVFS
  366 static int
  367 sysctl_hw_snd_unit(SYSCTL_HANDLER_ARGS)
  368 {
  369         struct snddev_info *d;
  370         int error, unit;
  371 
  372         unit = snd_unit;
  373         error = sysctl_handle_int(oidp, &unit, sizeof(unit), req);
  374         if (error == 0 && req->newptr != NULL) {
  375                 if (unit < 0 || unit >= devclass_get_maxunit(pcm_devclass))
  376                         return EINVAL;
  377                 d = devclass_get_softc(pcm_devclass, unit);
  378                 if (d == NULL || SLIST_EMPTY(&d->channels))
  379                         return EINVAL;
  380                 snd_unit = unit;
  381         }
  382         return (error);
  383 }
  384 SYSCTL_PROC(_hw_snd, OID_AUTO, unit, CTLTYPE_INT | CTLFLAG_RW,
  385             0, sizeof(int), sysctl_hw_snd_unit, "I", "");
  386 #endif
  387 
  388 static int
  389 sysctl_hw_snd_maxautovchans(SYSCTL_HANDLER_ARGS)
  390 {
  391         struct snddev_info *d;
  392         int i, v, error;
  393 
  394         v = snd_maxautovchans;
  395         error = sysctl_handle_int(oidp, &v, sizeof(v), req);
  396         if (error == 0 && req->newptr != NULL) {
  397                 if (v < 0 || v > PCMMAXCHAN)
  398                         return E2BIG;
  399                 if (pcm_devclass != NULL && v != snd_maxautovchans) {
  400                         for (i = 0; i < devclass_get_maxunit(pcm_devclass); i++) {
  401                                 d = devclass_get_softc(pcm_devclass, i);
  402                                 if (!d)
  403                                         continue;
  404                                 pcm_setmaxautovchans(d, v);
  405                         }
  406                 }
  407                 snd_maxautovchans = v;
  408         }
  409         return (error);
  410 }
  411 SYSCTL_PROC(_hw_snd, OID_AUTO, maxautovchans, CTLTYPE_INT | CTLFLAG_RW,
  412             0, sizeof(int), sysctl_hw_snd_maxautovchans, "I", "");
  413 
  414 struct pcm_channel *
  415 pcm_chn_create(struct snddev_info *d, struct pcm_channel *parent, kobj_class_t cls, int dir, void *devinfo)
  416 {
  417         struct snddev_channel *sce;
  418         struct pcm_channel *ch, *c;
  419         char *dirs;
  420         uint32_t flsearch = 0;
  421         int direction, err, rpnum, *pnum;
  422 
  423         switch(dir) {
  424         case PCMDIR_PLAY:
  425                 dirs = "play";
  426                 direction = PCMDIR_PLAY;
  427                 pnum = &d->playcount;
  428                 break;
  429 
  430         case PCMDIR_REC:
  431                 dirs = "record";
  432                 direction = PCMDIR_REC;
  433                 pnum = &d->reccount;
  434                 break;
  435 
  436         case PCMDIR_VIRTUAL:
  437                 dirs = "virtual";
  438                 direction = PCMDIR_PLAY;
  439                 pnum = &d->vchancount;
  440                 flsearch = CHN_F_VIRTUAL;
  441                 break;
  442 
  443         default:
  444                 return NULL;
  445         }
  446 
  447         ch = malloc(sizeof(*ch), M_DEVBUF, M_WAITOK | M_ZERO);
  448         if (!ch)
  449                 return NULL;
  450 
  451         ch->methods = kobj_create(cls, M_DEVBUF, M_WAITOK);
  452         if (!ch->methods) {
  453                 free(ch, M_DEVBUF);
  454 
  455                 return NULL;
  456         }
  457 
  458         snd_mtxlock(d->lock);
  459         ch->num = 0;
  460         rpnum = 0;
  461         SLIST_FOREACH(sce, &d->channels, link) {
  462                 c = sce->channel;
  463                 if (direction != c->direction ||
  464                                 (c->flags & CHN_F_VIRTUAL) != flsearch)
  465                         continue;
  466                 if (ch->num == c->num)
  467                         ch->num++;
  468                 else {
  469 #if 0
  470                         device_printf(d->dev,
  471                                 "%s: %s channel numbering screwed (Expect: %d, Got: %d)\n",
  472                                 __func__, dirs, ch->num, c->num);
  473 #endif
  474                         goto retry_num_search;
  475                 }
  476                 rpnum++;
  477         }
  478         goto retry_num_search_out;
  479 retry_num_search:
  480         rpnum = 0;
  481         SLIST_FOREACH(sce, &d->channels, link) {
  482                 c = sce->channel;
  483                 if (direction != c->direction ||
  484                                 (c->flags & CHN_F_VIRTUAL) != flsearch)
  485                         continue;
  486                 if (ch->num == c->num) {
  487                         ch->num++;
  488                         goto retry_num_search;
  489                 }
  490                 rpnum++;
  491         }
  492 retry_num_search_out:
  493         if (*pnum != rpnum) {
  494                 device_printf(d->dev,
  495                         "%s: WARNING: pnum screwed : dirs=%s, pnum=%d, rpnum=%d\n",
  496                         __func__, dirs, *pnum, rpnum);
  497                 *pnum = rpnum;
  498         }
  499         (*pnum)++;
  500         snd_mtxunlock(d->lock);
  501 
  502         ch->pid = -1;
  503         ch->parentsnddev = d;
  504         ch->parentchannel = parent;
  505         ch->dev = d->dev;
  506         snprintf(ch->name, CHN_NAMELEN, "%s:%s:%d", device_get_nameunit(ch->dev), dirs, ch->num);
  507 
  508         err = chn_init(ch, devinfo, dir, direction);
  509         if (err) {
  510                 device_printf(d->dev, "chn_init(%s) failed: err = %d\n", ch->name, err);
  511                 kobj_delete(ch->methods, M_DEVBUF);
  512                 free(ch, M_DEVBUF);
  513                 snd_mtxlock(d->lock);
  514                 (*pnum)--;
  515                 snd_mtxunlock(d->lock);
  516 
  517                 return NULL;
  518         }
  519 
  520         return ch;
  521 }
  522 
  523 int
  524 pcm_chn_destroy(struct pcm_channel *ch)
  525 {
  526         struct snddev_info *d;
  527         int err;
  528 
  529         d = ch->parentsnddev;
  530         err = chn_kill(ch);
  531         if (err) {
  532                 device_printf(d->dev, "chn_kill(%s) failed, err = %d\n", ch->name, err);
  533                 return err;
  534         }
  535 
  536         kobj_delete(ch->methods, M_DEVBUF);
  537         free(ch, M_DEVBUF);
  538 
  539         return 0;
  540 }
  541 
  542 int
  543 pcm_chn_add(struct snddev_info *d, struct pcm_channel *ch)
  544 {
  545         struct snddev_channel *sce, *tmp, *after;
  546         unsigned rdevcount;
  547         int device = device_get_unit(d->dev);
  548         size_t namelen;
  549 
  550         /*
  551          * Note it's confusing nomenclature.
  552          * dev_t
  553          * device -> pcm_device
  554          * unit -> pcm_channel
  555          * channel -> snddev_channel
  556          * device_t
  557          * unit -> pcm_device
  558          */
  559 
  560         sce = malloc(sizeof(*sce), M_DEVBUF, M_WAITOK | M_ZERO);
  561         if (!sce) {
  562                 return ENOMEM;
  563         }
  564 
  565         snd_mtxlock(d->lock);
  566         sce->channel = ch;
  567         sce->chan_num = 0;
  568         rdevcount = 0;
  569         after = NULL;
  570         SLIST_FOREACH(tmp, &d->channels, link) {
  571                 if (sce->chan_num == tmp->chan_num)
  572                         sce->chan_num++;
  573                 else {
  574 #if 0
  575                         device_printf(d->dev,
  576                                 "%s: cdev numbering screwed (Expect: %d, Got: %d)\n",
  577                                 __func__, sce->chan_num, tmp->chan_num);
  578 #endif
  579                         goto retry_chan_num_search;
  580                 }
  581                 after = tmp;
  582                 rdevcount++;
  583         }
  584         goto retry_chan_num_search_out;
  585 retry_chan_num_search:
  586         /*
  587          * Look for possible channel numbering collision. This may not
  588          * be optimized, but it will ensure that no collision occured.
  589          * Can be considered cheap since none of the locking/unlocking
  590          * operations involved.
  591          */
  592         rdevcount = 0;
  593         after = NULL;
  594         SLIST_FOREACH(tmp, &d->channels, link) {
  595                 if (sce->chan_num == tmp->chan_num) {
  596                         sce->chan_num++;
  597                         goto retry_chan_num_search;
  598                 }
  599                 if (sce->chan_num > tmp->chan_num)
  600                         after = tmp;
  601                 rdevcount++;
  602         }
  603 retry_chan_num_search_out:
  604         /*
  605          * Don't overflow PCMMKMINOR / PCMMAXCHAN.
  606          */
  607         if (sce->chan_num > PCMMAXCHAN) {
  608                 snd_mtxunlock(d->lock);
  609                 device_printf(d->dev,
  610                         "%s: WARNING: sce->chan_num overflow! (%d)\n",
  611                         __func__, sce->chan_num);
  612                 free(sce, M_DEVBUF);
  613                 return E2BIG;
  614         }
  615         if (d->devcount != rdevcount) {
  616                 device_printf(d->dev,
  617                         "%s: WARNING: devcount screwed! d->devcount=%u, rdevcount=%u\n",
  618                         __func__, d->devcount, rdevcount);
  619                 d->devcount = rdevcount;
  620         }
  621         d->devcount++;
  622         if (after == NULL) {
  623                 SLIST_INSERT_HEAD(&d->channels, sce, link);
  624         } else {
  625                 SLIST_INSERT_AFTER(after, sce, link);
  626         }
  627 #if 0
  628         if (1) {
  629                 int cnum = 0;
  630                 SLIST_FOREACH(tmp, &d->channels, link) {
  631                         if (cnum != tmp->chan_num)
  632                                 device_printf(d->dev,
  633                                         "%s: WARNING: inconsistent cdev numbering! (Expect: %d, Got: %d)\n",
  634                                         __func__, cnum, tmp->chan_num);
  635                         cnum++;
  636                 }
  637         }
  638 #endif
  639 
  640         namelen = strlen(ch->name);
  641         if ((CHN_NAMELEN - namelen) > 10) {     /* ":dspXX.YYY" */
  642                 snprintf(ch->name + namelen,
  643                         CHN_NAMELEN - namelen, ":dsp%d.%d",
  644                         device, sce->chan_num);
  645         }
  646         snd_mtxunlock(d->lock);
  647 
  648         /*
  649          * I will revisit these someday, and nuke it mercilessly..
  650          */
  651         sce->dsp_devt = make_dev(&dsp_cdevsw,
  652                         PCMMKMINOR(device, SND_DEV_DSP, sce->chan_num),
  653                         UID_ROOT, GID_WHEEL, 0666, "dsp%d.%d",
  654                         device, sce->chan_num);
  655 
  656         sce->dspW_devt = make_dev(&dsp_cdevsw,
  657                         PCMMKMINOR(device, SND_DEV_DSP16, sce->chan_num),
  658                         UID_ROOT, GID_WHEEL, 0666, "dspW%d.%d",
  659                         device, sce->chan_num);
  660 
  661         sce->audio_devt = make_dev(&dsp_cdevsw,
  662                         PCMMKMINOR(device, SND_DEV_AUDIO, sce->chan_num),
  663                         UID_ROOT, GID_WHEEL, 0666, "audio%d.%d",
  664                         device, sce->chan_num);
  665 
  666         if (ch->direction == PCMDIR_REC)
  667                 sce->dspr_devt = make_dev(&dsp_cdevsw,
  668                                 PCMMKMINOR(device, SND_DEV_DSPREC,
  669                                         sce->chan_num), UID_ROOT, GID_WHEEL,
  670                                 0666, "dspr%d.%d", device, sce->chan_num);
  671 
  672         return 0;
  673 }
  674 
  675 int
  676 pcm_chn_remove(struct snddev_info *d, struct pcm_channel *ch)
  677 {
  678         struct snddev_channel *sce;
  679 #if 0
  680         int ourlock;
  681 
  682         ourlock = 0;
  683         if (!mtx_owned(d->lock)) {
  684                 snd_mtxlock(d->lock);
  685                 ourlock = 1;
  686         }
  687 #endif
  688 
  689         SLIST_FOREACH(sce, &d->channels, link) {
  690                 if (sce->channel == ch)
  691                         goto gotit;
  692         }
  693 #if 0
  694         if (ourlock)
  695                 snd_mtxunlock(d->lock);
  696 #endif
  697         return EINVAL;
  698 gotit:
  699         SLIST_REMOVE(&d->channels, sce, snddev_channel, link);
  700 
  701         if (ch->flags & CHN_F_VIRTUAL)
  702                 d->vchancount--;
  703         else if (ch->direction == PCMDIR_REC)
  704                 d->reccount--;
  705         else
  706                 d->playcount--;
  707 
  708 #if 0
  709         if (ourlock)
  710                 snd_mtxunlock(d->lock);
  711 #endif
  712         free(sce, M_DEVBUF);
  713 
  714         return 0;
  715 }
  716 
  717 int
  718 pcm_addchan(device_t dev, int dir, kobj_class_t cls, void *devinfo)
  719 {
  720         struct snddev_info *d = device_get_softc(dev);
  721         struct pcm_channel *ch;
  722         int err;
  723 
  724         ch = pcm_chn_create(d, NULL, cls, dir, devinfo);
  725         if (!ch) {
  726                 device_printf(d->dev, "pcm_chn_create(%s, %d, %p) failed\n", cls->name, dir, devinfo);
  727                 return ENODEV;
  728         }
  729 
  730         err = pcm_chn_add(d, ch);
  731         if (err) {
  732                 device_printf(d->dev, "pcm_chn_add(%s) failed, err=%d\n", ch->name, err);
  733                 pcm_chn_destroy(ch);
  734                 return err;
  735         }
  736 
  737         return err;
  738 }
  739 
  740 static int
  741 pcm_killchan(device_t dev)
  742 {
  743         struct snddev_info *d = device_get_softc(dev);
  744         struct snddev_channel *sce;
  745         struct pcm_channel *ch;
  746         int error = 0;
  747 
  748         sce = SLIST_FIRST(&d->channels);
  749         ch = sce->channel;
  750 
  751         error = pcm_chn_remove(d, sce->channel);
  752         if (error)
  753                 return (error);
  754         return (pcm_chn_destroy(ch));
  755 }
  756 
  757 int
  758 pcm_setstatus(device_t dev, char *str)
  759 {
  760         struct snddev_info *d = device_get_softc(dev);
  761 
  762         snd_mtxlock(d->lock);
  763         strncpy(d->status, str, SND_STATUSLEN);
  764         snd_mtxunlock(d->lock);
  765         if (snd_maxautovchans > 0)
  766                 pcm_setvchans(d, 1);
  767         return 0;
  768 }
  769 
  770 uint32_t
  771 pcm_getflags(device_t dev)
  772 {
  773         struct snddev_info *d = device_get_softc(dev);
  774 
  775         return d->flags;
  776 }
  777 
  778 void
  779 pcm_setflags(device_t dev, uint32_t val)
  780 {
  781         struct snddev_info *d = device_get_softc(dev);
  782 
  783         d->flags = val;
  784 }
  785 
  786 void *
  787 pcm_getdevinfo(device_t dev)
  788 {
  789         struct snddev_info *d = device_get_softc(dev);
  790 
  791         return d->devinfo;
  792 }
  793 
  794 unsigned int
  795 pcm_getbuffersize(device_t dev, unsigned int min, unsigned int deflt, unsigned int max)
  796 {
  797         struct snddev_info *d = device_get_softc(dev);
  798         int sz, x;
  799 
  800         sz = 0;
  801         if (resource_int_value(device_get_name(dev), device_get_unit(dev), "buffersize", &sz) == 0) {
  802                 x = sz;
  803                 RANGE(sz, min, max);
  804                 if (x != sz)
  805                         device_printf(dev, "'buffersize=%d' hint is out of range (%d-%d), using %d\n", x, min, max, sz);
  806                 x = min;
  807                 while (x < sz)
  808                         x <<= 1;
  809                 if (x > sz)
  810                         x >>= 1;
  811                 if (x != sz) {
  812                         device_printf(dev, "'buffersize=%d' hint is not a power of 2, using %d\n", sz, x);
  813                         sz = x;
  814                 }
  815         } else {
  816                 sz = deflt;
  817         }
  818 
  819         d->bufsz = sz;
  820 
  821         return sz;
  822 }
  823 
  824 int
  825 pcm_register(device_t dev, void *devinfo, int numplay, int numrec)
  826 {
  827         struct snddev_info *d = device_get_softc(dev);
  828 
  829         if (pcm_veto_load) {
  830                 device_printf(dev, "disabled due to an error while initialising: %d\n", pcm_veto_load);
  831 
  832                 return EINVAL;
  833         }
  834 
  835         d->lock = snd_mtxcreate(device_get_nameunit(dev), "sound cdev");
  836 
  837 #if 0
  838         /*
  839          * d->flags should be cleared by the allocator of the softc.
  840          * We cannot clear this field here because several devices set
  841          * this flag before calling pcm_register().
  842          */
  843         d->flags = 0;
  844 #endif
  845         d->dev = dev;
  846         d->devinfo = devinfo;
  847         d->devcount = 0;
  848         d->reccount = 0;
  849         d->playcount = 0;
  850         d->vchancount = 0;
  851         d->inprog = 0;
  852 
  853         SLIST_INIT(&d->channels);
  854 
  855         if ((numplay == 0 || numrec == 0) && numplay != numrec)
  856                 d->flags |= SD_F_SIMPLEX;
  857 
  858         d->fakechan = fkchan_setup(dev);
  859         chn_init(d->fakechan, NULL, 0, 0);
  860 
  861 #ifdef SND_DYNSYSCTL
  862         sysctl_ctx_init(&d->sysctl_tree);
  863         d->sysctl_tree_top = SYSCTL_ADD_NODE(&d->sysctl_tree,
  864                                  SYSCTL_STATIC_CHILDREN(_hw_snd), OID_AUTO,
  865                                  device_get_nameunit(dev), CTLFLAG_RD, 0, "");
  866         if (d->sysctl_tree_top == NULL) {
  867                 sysctl_ctx_free(&d->sysctl_tree);
  868                 goto no;
  869         }
  870         SYSCTL_ADD_INT(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
  871             OID_AUTO, "buffersize", CTLFLAG_RD, &d->bufsz, 0, "");
  872 #endif
  873         if (numplay > 0) {
  874                 d->flags |= SD_F_AUTOVCHAN;
  875                 vchan_initsys(dev);
  876         }
  877 
  878         sndstat_register(dev, d->status, sndstat_prepare_pcm);
  879         return 0;
  880 no:
  881         snd_mtxfree(d->lock);
  882         return ENXIO;
  883 }
  884 
  885 int
  886 pcm_unregister(device_t dev)
  887 {
  888         struct snddev_info *d = device_get_softc(dev);
  889         struct snddev_channel *sce;
  890         struct pcmchan_children *pce;
  891         struct pcm_channel *ch;
  892 
  893         if (sndstat_acquire() != 0) {
  894                 device_printf(dev, "unregister: sndstat busy\n");
  895                 return EBUSY;
  896         }
  897 
  898         snd_mtxlock(d->lock);
  899         if (d->inprog) {
  900                 device_printf(dev, "unregister: operation in progress\n");
  901                 snd_mtxunlock(d->lock);
  902                 sndstat_release();
  903                 return EBUSY;
  904         }
  905 
  906         SLIST_FOREACH(sce, &d->channels, link) {
  907                 ch = sce->channel;
  908                 if (ch->refcount > 0) {
  909                         device_printf(dev, "unregister: channel %s busy (pid %d)\n", ch->name, ch->pid);
  910                         snd_mtxunlock(d->lock);
  911                         sndstat_release();
  912                         return EBUSY;
  913                 }
  914         }
  915 
  916         if (mixer_uninit(dev) == EBUSY) {
  917                 device_printf(dev, "unregister: mixer busy\n");
  918                 snd_mtxunlock(d->lock);
  919                 sndstat_release();
  920                 return EBUSY;
  921         }
  922 
  923         SLIST_FOREACH(sce, &d->channels, link) {
  924                 if (sce->dsp_devt) {
  925                         destroy_dev(sce->dsp_devt);
  926                         sce->dsp_devt = NULL;
  927                 }
  928                 if (sce->dspW_devt) {
  929                         destroy_dev(sce->dspW_devt);
  930                         sce->dspW_devt = NULL;
  931                 }
  932                 if (sce->audio_devt) {
  933                         destroy_dev(sce->audio_devt);
  934                         sce->audio_devt = NULL;
  935                 }
  936                 if (sce->dspr_devt) {
  937                         destroy_dev(sce->dspr_devt);
  938                         sce->dspr_devt = NULL;
  939                 }
  940                 d->devcount--;
  941                 ch = sce->channel;
  942                 if (ch == NULL)
  943                         continue;
  944                 pce = SLIST_FIRST(&ch->children);
  945                 while (pce != NULL) {
  946 #if 0
  947                         device_printf(d->dev, "<%s> removing <%s>\n",
  948                                 ch->name, (pce->channel != NULL) ?
  949                                         pce->channel->name : "unknown");
  950 #endif
  951                         SLIST_REMOVE(&ch->children, pce, pcmchan_children, link);
  952                         free(pce, M_DEVBUF);
  953                         pce = SLIST_FIRST(&ch->children);
  954                 }
  955         }
  956 
  957 #ifdef SND_DYNSYSCTL
  958         d->sysctl_tree_top = NULL;
  959         sysctl_ctx_free(&d->sysctl_tree);
  960 #endif
  961 
  962 #if 0
  963         SLIST_FOREACH(sce, &d->channels, link) {
  964                 ch = sce->channel;
  965                 if (ch == NULL)
  966                         continue;
  967                 if (!SLIST_EMPTY(&ch->children))
  968                         device_printf(d->dev, "%s: WARNING: <%s> dangling child!\n",
  969                                 __func__, ch->name);
  970         }
  971 #endif
  972         while (!SLIST_EMPTY(&d->channels))
  973                 pcm_killchan(dev);
  974 
  975         chn_kill(d->fakechan);
  976         fkchan_kill(d->fakechan);
  977 
  978 #if 0
  979         device_printf(d->dev, "%s: devcount=%u, playcount=%u, "
  980                 "reccount=%u, vchancount=%u\n",
  981                 __func__, d->devcount, d->playcount, d->reccount,
  982                 d->vchancount);
  983 #endif
  984         snd_mtxunlock(d->lock);
  985         snd_mtxfree(d->lock);
  986         sndstat_unregister(dev);
  987         sndstat_release();
  988         return 0;
  989 }
  990 
  991 /************************************************************************/
  992 
  993 static int
  994 sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose)
  995 {
  996         struct snddev_info *d;
  997         struct snddev_channel *sce;
  998         struct pcm_channel *c;
  999         struct pcm_feeder *f;
 1000         int pc, rc, vc;
 1001 
 1002         if (verbose < 1)
 1003                 return 0;
 1004 
 1005         d = device_get_softc(dev);
 1006         if (!d)
 1007                 return ENXIO;
 1008 
 1009         snd_mtxlock(d->lock);
 1010         if (!SLIST_EMPTY(&d->channels)) {
 1011                 pc = rc = vc = 0;
 1012                 SLIST_FOREACH(sce, &d->channels, link) {
 1013                         c = sce->channel;
 1014                         if (c->direction == PCMDIR_PLAY) {
 1015                                 if (c->flags & CHN_F_VIRTUAL)
 1016                                         vc++;
 1017                                 else
 1018                                         pc++;
 1019                         } else
 1020                                 rc++;
 1021                 }
 1022                 sbuf_printf(s, " (%dp/%dr/%dv channels%s%s)", d->playcount, d->reccount, d->vchancount,
 1023                                 (d->flags & SD_F_SIMPLEX)? "" : " duplex",
 1024 #ifdef USING_DEVFS
 1025                                 (device_get_unit(dev) == snd_unit)? " default" : ""
 1026 #else
 1027                                 ""
 1028 #endif
 1029                                 );
 1030 
 1031                 if (verbose <= 1) {
 1032                         snd_mtxunlock(d->lock);
 1033                         return 0;
 1034                 }
 1035 
 1036                 SLIST_FOREACH(sce, &d->channels, link) {
 1037                         c = sce->channel;
 1038 
 1039                         KASSERT(c->bufhard != NULL && c->bufsoft != NULL,
 1040                                 ("hosed pcm channel setup"));
 1041 
 1042                         sbuf_printf(s, "\n\t");
 1043 
 1044                         /* it would be better to indent child channels */
 1045                         sbuf_printf(s, "%s[%s]: ", c->parentchannel? c->parentchannel->name : "", c->name);
 1046                         sbuf_printf(s, "spd %d", c->speed);
 1047                         if (c->speed != sndbuf_getspd(c->bufhard))
 1048                                 sbuf_printf(s, "/%d", sndbuf_getspd(c->bufhard));
 1049                         sbuf_printf(s, ", fmt 0x%08x", c->format);
 1050                         if (c->format != sndbuf_getfmt(c->bufhard))
 1051                                 sbuf_printf(s, "/0x%08x", sndbuf_getfmt(c->bufhard));
 1052                         sbuf_printf(s, ", flags 0x%08x, 0x%08x", c->flags, c->feederflags);
 1053                         if (c->pid != -1)
 1054                                 sbuf_printf(s, ", pid %d", c->pid);
 1055                         sbuf_printf(s, "\n\t");
 1056 
 1057                         sbuf_printf(s, "interrupts %d, ", c->interrupts);
 1058                         if (c->direction == PCMDIR_REC)
 1059                                 sbuf_printf(s, "overruns %d, hfree %d, sfree %d [b:%d/%d/%d|bs:%d/%d/%d]",
 1060                                         c->xruns, sndbuf_getfree(c->bufhard), sndbuf_getfree(c->bufsoft),
 1061                                         sndbuf_getsize(c->bufhard), sndbuf_getblksz(c->bufhard),
 1062                                         sndbuf_getblkcnt(c->bufhard),
 1063                                         sndbuf_getsize(c->bufsoft), sndbuf_getblksz(c->bufsoft),
 1064                                         sndbuf_getblkcnt(c->bufsoft));
 1065                         else
 1066                                 sbuf_printf(s, "underruns %d, ready %d [b:%d/%d/%d|bs:%d/%d/%d]",
 1067                                         c->xruns, sndbuf_getready(c->bufsoft),
 1068                                         sndbuf_getsize(c->bufhard), sndbuf_getblksz(c->bufhard),
 1069                                         sndbuf_getblkcnt(c->bufhard),
 1070                                         sndbuf_getsize(c->bufsoft), sndbuf_getblksz(c->bufsoft),
 1071                                         sndbuf_getblkcnt(c->bufsoft));
 1072                         sbuf_printf(s, "\n\t");
 1073 
 1074                         sbuf_printf(s, "{%s}", (c->direction == PCMDIR_REC)? "hardware" : "userland");
 1075                         sbuf_printf(s, " -> ");
 1076                         f = c->feeder;
 1077                         while (f->source != NULL)
 1078                                 f = f->source;
 1079                         while (f != NULL) {
 1080                                 sbuf_printf(s, "%s", f->class->name);
 1081                                 if (f->desc->type == FEEDER_FMT)
 1082                                         sbuf_printf(s, "(0x%08x -> 0x%08x)", f->desc->in, f->desc->out);
 1083                                 if (f->desc->type == FEEDER_RATE)
 1084                                         sbuf_printf(s, "(%d -> %d)", FEEDER_GET(f, FEEDRATE_SRC), FEEDER_GET(f, FEEDRATE_DST));
 1085                                 if (f->desc->type == FEEDER_ROOT || f->desc->type == FEEDER_MIXER ||
 1086                                                 f->desc->type == FEEDER_VOLUME)
 1087                                         sbuf_printf(s, "(0x%08x)", f->desc->out);
 1088                                 sbuf_printf(s, " -> ");
 1089                                 f = f->parent;
 1090                         }
 1091                         sbuf_printf(s, "{%s}", (c->direction == PCMDIR_REC)? "userland" : "hardware");
 1092                 }
 1093         } else
 1094                 sbuf_printf(s, " (mixer only)");
 1095         snd_mtxunlock(d->lock);
 1096 
 1097         return 0;
 1098 }
 1099 
 1100 /************************************************************************/
 1101 
 1102 #ifdef SND_DYNSYSCTL
 1103 int
 1104 sysctl_hw_snd_vchans(SYSCTL_HANDLER_ARGS)
 1105 {
 1106         struct snddev_info *d;
 1107         int err, newcnt;
 1108 
 1109         d = oidp->oid_arg1;
 1110 
 1111         newcnt = d->vchancount;
 1112         err = sysctl_handle_int(oidp, &newcnt, sizeof(newcnt), req);
 1113 
 1114         if (err == 0 && req->newptr != NULL && d->vchancount != newcnt)
 1115                 err = pcm_setvchans(d, newcnt);
 1116 
 1117         return err;
 1118 }
 1119 #endif
 1120 
 1121 /************************************************************************/
 1122 
 1123 static int
 1124 sound_modevent(module_t mod, int type, void *data)
 1125 {
 1126 #if 0
 1127         return (midi_modevent(mod, type, data));
 1128 #else
 1129         return 0;
 1130 #endif
 1131 }
 1132 
 1133 DEV_MODULE(sound, sound_modevent, NULL);
 1134 MODULE_VERSION(sound, SOUND_MODVER);

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