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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    5  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    6  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #ifdef HAVE_KERNEL_OPTION_HEADERS
   32 #include "opt_snd.h"
   33 #endif
   34 
   35 #include <dev/sound/pcm/sound.h>
   36 #include <sys/ctype.h>
   37 #include <sys/lock.h>
   38 #include <sys/rwlock.h>
   39 #include <sys/sysent.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/vm_object.h>
   43 #include <vm/vm_page.h>
   44 #include <vm/vm_pager.h>
   45 
   46 SND_DECLARE_FILE("$FreeBSD: stable/12/sys/dev/sound/pcm/dsp.c 361174 2020-05-18 09:07:14Z hselasky $");
   47 
   48 static int dsp_mmap_allow_prot_exec = 0;
   49 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RWTUN,
   50     &dsp_mmap_allow_prot_exec, 0,
   51     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
   52 
   53 static int dsp_basename_clone = 1;
   54 SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
   55     &dsp_basename_clone, 0,
   56     "DSP basename cloning (0: Disable; 1: Enabled)");
   57 
   58 struct dsp_cdevinfo {
   59         struct pcm_channel *rdch, *wrch;
   60         struct pcm_channel *volch;
   61         int busy, simplex;
   62         TAILQ_ENTRY(dsp_cdevinfo) link;
   63 };
   64 
   65 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
   66 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
   67 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
   68 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
   69 
   70 #define DSP_CDEVINFO_CACHESIZE  8
   71 
   72 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
   73                                  (y) != NULL && (y)->si_drv1 != NULL)
   74 
   75 #define OLDPCM_IOCTL
   76 
   77 static d_open_t dsp_open;
   78 static d_close_t dsp_close;
   79 static d_read_t dsp_read;
   80 static d_write_t dsp_write;
   81 static d_ioctl_t dsp_ioctl;
   82 static d_poll_t dsp_poll;
   83 static d_mmap_t dsp_mmap;
   84 static d_mmap_single_t dsp_mmap_single;
   85 
   86 struct cdevsw dsp_cdevsw = {
   87         .d_version =    D_VERSION,
   88         .d_open =       dsp_open,
   89         .d_close =      dsp_close,
   90         .d_read =       dsp_read,
   91         .d_write =      dsp_write,
   92         .d_ioctl =      dsp_ioctl,
   93         .d_poll =       dsp_poll,
   94         .d_mmap =       dsp_mmap,
   95         .d_mmap_single = dsp_mmap_single,
   96         .d_name =       "dsp",
   97 };
   98 
   99 static eventhandler_tag dsp_ehtag = NULL;
  100 static int dsp_umax = -1;
  101 static int dsp_cmax = -1;
  102 
  103 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
  104 static int dsp_oss_syncstart(int sg_id);
  105 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
  106 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
  107 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  108 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  109 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
  110 #ifdef OSSV4_EXPERIMENT
  111 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  112 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  113 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  114 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  115 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
  116 #endif
  117 
  118 static struct snddev_info *
  119 dsp_get_info(struct cdev *dev)
  120 {
  121         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
  122 }
  123 
  124 static uint32_t
  125 dsp_get_flags(struct cdev *dev)
  126 {
  127         device_t bdev;
  128 
  129         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  130 
  131         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
  132 }
  133 
  134 static void
  135 dsp_set_flags(struct cdev *dev, uint32_t flags)
  136 {
  137         device_t bdev;
  138 
  139         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  140 
  141         if (bdev != NULL)
  142                 pcm_setflags(bdev, flags);
  143 }
  144 
  145 /*
  146  * return the channels associated with an open device instance.
  147  * lock channels specified.
  148  */
  149 static int
  150 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
  151     uint32_t prio)
  152 {
  153         struct snddev_info *d;
  154         struct pcm_channel *ch;
  155         uint32_t flags;
  156 
  157         if (PCM_SIMPLEX(dev) != 0) {
  158                 d = dsp_get_info(dev);
  159                 if (!PCM_REGISTERED(d))
  160                         return (ENXIO);
  161                 PCM_LOCK(d);
  162                 PCM_WAIT(d);
  163                 PCM_ACQUIRE(d);
  164                 /*
  165                  * Note: order is important -
  166                  *       pcm flags -> prio query flags -> wild guess
  167                  */
  168                 ch = NULL;
  169                 flags = dsp_get_flags(dev);
  170                 if (flags & SD_F_PRIO_WR) {
  171                         ch = PCM_RDCH(dev);
  172                         PCM_RDCH(dev) = NULL;
  173                 } else if (flags & SD_F_PRIO_RD) {
  174                         ch = PCM_WRCH(dev);
  175                         PCM_WRCH(dev) = NULL;
  176                 } else if (prio & SD_F_PRIO_WR) {
  177                         ch = PCM_RDCH(dev);
  178                         PCM_RDCH(dev) = NULL;
  179                         flags |= SD_F_PRIO_WR;
  180                 } else if (prio & SD_F_PRIO_RD) {
  181                         ch = PCM_WRCH(dev);
  182                         PCM_WRCH(dev) = NULL;
  183                         flags |= SD_F_PRIO_RD;
  184                 } else if (PCM_WRCH(dev) != NULL) {
  185                         ch = PCM_RDCH(dev);
  186                         PCM_RDCH(dev) = NULL;
  187                         flags |= SD_F_PRIO_WR;
  188                 } else if (PCM_RDCH(dev) != NULL) {
  189                         ch = PCM_WRCH(dev);
  190                         PCM_WRCH(dev) = NULL;
  191                         flags |= SD_F_PRIO_RD;
  192                 }
  193                 PCM_SIMPLEX(dev) = 0;
  194                 dsp_set_flags(dev, flags);
  195                 if (ch != NULL) {
  196                         CHN_LOCK(ch);
  197                         pcm_chnref(ch, -1);
  198                         pcm_chnrelease(ch);
  199                 }
  200                 PCM_RELEASE(d);
  201                 PCM_UNLOCK(d);
  202         }
  203 
  204         *rdch = PCM_RDCH(dev);
  205         *wrch = PCM_WRCH(dev);
  206 
  207         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
  208                 CHN_LOCK(*rdch);
  209         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
  210                 CHN_LOCK(*wrch);
  211 
  212         return (0);
  213 }
  214 
  215 /* unlock specified channels */
  216 static void
  217 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
  218     uint32_t prio)
  219 {
  220         if (wrch != NULL && (prio & SD_F_PRIO_WR))
  221                 CHN_UNLOCK(wrch);
  222         if (rdch != NULL && (prio & SD_F_PRIO_RD))
  223                 CHN_UNLOCK(rdch);
  224 }
  225 
  226 static void
  227 dsp_cdevinfo_alloc(struct cdev *dev,
  228     struct pcm_channel *rdch, struct pcm_channel *wrch,
  229     struct pcm_channel *volch)
  230 {
  231         struct snddev_info *d;
  232         struct dsp_cdevinfo *cdi;
  233         int simplex;
  234 
  235         d = dsp_get_info(dev);
  236 
  237         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
  238             ((rdch == NULL && wrch == NULL) || rdch != wrch),
  239             ("bogus %s(), what are you trying to accomplish here?", __func__));
  240         PCM_BUSYASSERT(d);
  241         PCM_LOCKASSERT(d);
  242 
  243         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
  244 
  245         /*
  246          * Scan for free instance entry and put it into the end of list.
  247          * Create new one if necessary.
  248          */
  249         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
  250                 if (cdi->busy != 0)
  251                         break;
  252                 cdi->rdch = rdch;
  253                 cdi->wrch = wrch;
  254                 cdi->volch = volch;
  255                 cdi->simplex = simplex;
  256                 cdi->busy = 1;
  257                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  258                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  259                 dev->si_drv1 = cdi;
  260                 return;
  261         }
  262         PCM_UNLOCK(d);
  263         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  264         PCM_LOCK(d);
  265         cdi->rdch = rdch;
  266         cdi->wrch = wrch;
  267         cdi->volch = volch;
  268         cdi->simplex = simplex;
  269         cdi->busy = 1;
  270         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  271         dev->si_drv1 = cdi;
  272 }
  273 
  274 static void
  275 dsp_cdevinfo_free(struct cdev *dev)
  276 {
  277         struct snddev_info *d;
  278         struct dsp_cdevinfo *cdi, *tmp;
  279         uint32_t flags;
  280         int i;
  281 
  282         d = dsp_get_info(dev);
  283 
  284         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
  285             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
  286             PCM_VOLCH(dev) == NULL,
  287             ("bogus %s(), what are you trying to accomplish here?", __func__));
  288         PCM_BUSYASSERT(d);
  289         PCM_LOCKASSERT(d);
  290 
  291         cdi = dev->si_drv1;
  292         dev->si_drv1 = NULL;
  293         cdi->rdch = NULL;
  294         cdi->wrch = NULL;
  295         cdi->volch = NULL;
  296         cdi->simplex = 0;
  297         cdi->busy = 0;
  298 
  299         /*
  300          * Once it is free, move it back to the beginning of list for
  301          * faster new entry allocation.
  302          */
  303         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  304         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  305 
  306         /*
  307          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
  308          * Reset simplex flags.
  309          */
  310         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
  311         i = DSP_CDEVINFO_CACHESIZE;
  312         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
  313                 if (cdi->busy != 0) {
  314                         if (cdi->simplex == 0) {
  315                                 if (cdi->rdch != NULL)
  316                                         flags |= SD_F_PRIO_RD;
  317                                 if (cdi->wrch != NULL)
  318                                         flags |= SD_F_PRIO_WR;
  319                         }
  320                 } else {
  321                         if (i == 0) {
  322                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  323                                 free(cdi, M_DEVBUF);
  324                         } else
  325                                 i--;
  326                 }
  327         }
  328         dsp_set_flags(dev, flags);
  329 }
  330 
  331 void
  332 dsp_cdevinfo_init(struct snddev_info *d)
  333 {
  334         struct dsp_cdevinfo *cdi;
  335         int i;
  336 
  337         KASSERT(d != NULL, ("NULL snddev_info"));
  338         PCM_BUSYASSERT(d);
  339         PCM_UNLOCKASSERT(d);
  340 
  341         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  342         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
  343                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  344                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  345         }
  346 }
  347 
  348 void
  349 dsp_cdevinfo_flush(struct snddev_info *d)
  350 {
  351         struct dsp_cdevinfo *cdi, *tmp;
  352 
  353         KASSERT(d != NULL, ("NULL snddev_info"));
  354         PCM_BUSYASSERT(d);
  355         PCM_UNLOCKASSERT(d);
  356 
  357         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
  358         while (cdi != NULL) {
  359                 tmp = TAILQ_NEXT(cdi, link);
  360                 free(cdi, M_DEVBUF);
  361                 cdi = tmp;
  362         }
  363         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  364 }
  365 
  366 /* duplex / simplex cdev type */
  367 enum {
  368         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
  369         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
  370         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
  371 };
  372 
  373 enum {
  374         DSP_CDEV_VOLCTL_NONE,
  375         DSP_CDEV_VOLCTL_READ,
  376         DSP_CDEV_VOLCTL_WRITE
  377 };
  378 
  379 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
  380 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
  381 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
  382 #define DSP_F_READ(x)           ((x) & FREAD)
  383 #define DSP_F_WRITE(x)          ((x) & FWRITE)
  384 
  385 static const struct {
  386         int type;
  387         char *name;
  388         char *sep;
  389         char *alias;
  390         int use_sep;
  391         int hw;
  392         int max;
  393         int volctl;
  394         uint32_t fmt, spd;
  395         int query;
  396 } dsp_cdevs[] = {
  397         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
  398           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  399           DSP_CDEV_TYPE_RDWR },
  400         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
  401           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
  402           DSP_CDEV_TYPE_RDWR },
  403         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
  404           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
  405           DSP_CDEV_TYPE_RDWR },
  406         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
  407           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  408         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
  409           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  410         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
  411           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  412         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
  413           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  414         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
  415           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
  416         /* Low priority, OSSv4 aliases. */
  417         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
  418           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  419           DSP_CDEV_TYPE_RDWR },
  420         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
  421           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  422           DSP_CDEV_TYPE_RDWR },
  423         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
  424           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  425           DSP_CDEV_TYPE_RDWR },
  426         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
  427           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  428           DSP_CDEV_TYPE_RDWR },
  429         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
  430           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  431           DSP_CDEV_TYPE_RDWR },
  432 };
  433 
  434 #define DSP_FIXUP_ERROR()               do {                            \
  435         prio = dsp_get_flags(i_dev);                                    \
  436         if (!DSP_F_VALID(flags))                                        \
  437                 error = EINVAL;                                         \
  438         if (!DSP_F_DUPLEX(flags) &&                                     \
  439             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
  440             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
  441                 error = ENOTSUP;                                        \
  442         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
  443             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
  444             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
  445                 error = EBUSY;                                          \
  446         else if (DSP_REGISTERED(d, i_dev))                              \
  447                 error = EBUSY;                                          \
  448 } while (0)
  449 
  450 static int
  451 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  452 {
  453         struct pcm_channel *rdch, *wrch;
  454         struct snddev_info *d;
  455         uint32_t fmt, spd, prio, volctl;
  456         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
  457 
  458         /* Kind of impossible.. */
  459         if (i_dev == NULL || td == NULL)
  460                 return (ENODEV);
  461 
  462         d = dsp_get_info(i_dev);
  463         if (PCM_DETACHING(d) || !PCM_REGISTERED(d))
  464                 return (EBADF);
  465 
  466         PCM_GIANT_ENTER(d);
  467 
  468         /* Lock snddev so nobody else can monkey with it. */
  469         PCM_LOCK(d);
  470         PCM_WAIT(d);
  471 
  472         /*
  473          * Try to acquire cloned device before someone else pick it.
  474          * ENODEV means this is not a cloned droids.
  475          */
  476         error = snd_clone_acquire(i_dev);
  477         if (!(error == 0 || error == ENODEV)) {
  478                 DSP_FIXUP_ERROR();
  479                 PCM_UNLOCK(d);
  480                 PCM_GIANT_EXIT(d);
  481                 return (error);
  482         }
  483 
  484         error = 0;
  485         DSP_FIXUP_ERROR();
  486 
  487         if (error != 0) {
  488                 (void)snd_clone_release(i_dev);
  489                 PCM_UNLOCK(d);
  490                 PCM_GIANT_EXIT(d);
  491                 return (error);
  492         }
  493 
  494         /*
  495          * That is just enough. Acquire and unlock pcm lock so
  496          * the other will just have to wait until we finish doing
  497          * everything.
  498          */
  499         PCM_ACQUIRE(d);
  500         PCM_UNLOCK(d);
  501 
  502         devtype = PCMDEV(i_dev);
  503         wdevunit = -1;
  504         rdevunit = -1;
  505         fmt = 0;
  506         spd = 0;
  507         volctl = DSP_CDEV_VOLCTL_NONE;
  508 
  509         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
  510                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
  511                         continue;
  512                 /*
  513                  * Volume control only valid for DSPHW devices,
  514                  * and it must be opened in opposite direction be it
  515                  * simplex or duplex. Anything else will be handled
  516                  * as usual.
  517                  */
  518                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
  519                         if (dsp_cdevs[i].volctl != 0 &&
  520                             DSP_F_READ(flags)) {
  521                                 volctl = DSP_CDEV_VOLCTL_WRITE;
  522                                 flags &= ~FREAD;
  523                                 flags |= FWRITE;
  524                         }
  525                         if (DSP_F_READ(flags)) {
  526                                 (void)snd_clone_release(i_dev);
  527                                 PCM_RELEASE_QUICK(d);
  528                                 PCM_GIANT_EXIT(d);
  529                                 return (ENOTSUP);
  530                         }
  531                         wdevunit = dev2unit(i_dev);
  532                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
  533                         if (dsp_cdevs[i].volctl != 0 &&
  534                             DSP_F_WRITE(flags)) {
  535                                 volctl = DSP_CDEV_VOLCTL_READ;
  536                                 flags &= ~FWRITE;
  537                                 flags |= FREAD;
  538                         }
  539                         if (DSP_F_WRITE(flags)) {
  540                                 (void)snd_clone_release(i_dev);
  541                                 PCM_RELEASE_QUICK(d);
  542                                 PCM_GIANT_EXIT(d);
  543                                 return (ENOTSUP);
  544                         }
  545                         rdevunit = dev2unit(i_dev);
  546                 }
  547                 fmt = dsp_cdevs[i].fmt;
  548                 spd = dsp_cdevs[i].spd;
  549                 break;
  550         }
  551 
  552         /* No matching devtype? */
  553         if (fmt == 0 || spd == 0)
  554                 panic("impossible devtype %d", devtype);
  555 
  556         rdch = NULL;
  557         wrch = NULL;
  558         rderror = 0;
  559         wrerror = 0;
  560 
  561         /*
  562          * if we get here, the open request is valid- either:
  563          *   * we were previously not open
  564          *   * we were open for play xor record and the opener wants
  565          *     the non-open direction
  566          */
  567         if (DSP_F_READ(flags)) {
  568                 /* open for read */
  569                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
  570                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
  571 
  572                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
  573                         rderror = ENXIO;
  574 
  575                 if (volctl == DSP_CDEV_VOLCTL_READ)
  576                         rderror = 0;
  577 
  578                 if (rderror != 0) {
  579                         if (rdch != NULL)
  580                                 pcm_chnrelease(rdch);
  581                         if (!DSP_F_DUPLEX(flags)) {
  582                                 (void)snd_clone_release(i_dev);
  583                                 PCM_RELEASE_QUICK(d);
  584                                 PCM_GIANT_EXIT(d);
  585                                 return (rderror);
  586                         }
  587                         rdch = NULL;
  588                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
  589                         if (rdch != NULL) {
  590                                 pcm_chnref(rdch, 1);
  591                                 pcm_chnrelease(rdch);
  592                         }
  593                 } else {
  594                         if (flags & O_NONBLOCK)
  595                                 rdch->flags |= CHN_F_NBIO;
  596                         if (flags & O_EXCL)
  597                                 rdch->flags |= CHN_F_EXCLUSIVE;
  598                         pcm_chnref(rdch, 1);
  599                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  600                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
  601                         CHN_UNLOCK(rdch);
  602                 }
  603         }
  604 
  605         if (DSP_F_WRITE(flags)) {
  606                 /* open for write */
  607                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
  608                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
  609 
  610                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
  611                         wrerror = ENXIO;
  612 
  613                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
  614                         wrerror = 0;
  615 
  616                 if (wrerror != 0) {
  617                         if (wrch != NULL)
  618                                 pcm_chnrelease(wrch);
  619                         if (!DSP_F_DUPLEX(flags)) {
  620                                 if (rdch != NULL) {
  621                                         /*
  622                                          * Lock, deref and release previously
  623                                          * created record channel
  624                                          */
  625                                         CHN_LOCK(rdch);
  626                                         pcm_chnref(rdch, -1);
  627                                         pcm_chnrelease(rdch);
  628                                 }
  629                                 (void)snd_clone_release(i_dev);
  630                                 PCM_RELEASE_QUICK(d);
  631                                 PCM_GIANT_EXIT(d);
  632                                 return (wrerror);
  633                         }
  634                         wrch = NULL;
  635                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
  636                         if (wrch != NULL) {
  637                                 pcm_chnref(wrch, 1);
  638                                 pcm_chnrelease(wrch);
  639                         }
  640                 } else {
  641                         if (flags & O_NONBLOCK)
  642                                 wrch->flags |= CHN_F_NBIO;
  643                         if (flags & O_EXCL)
  644                                 wrch->flags |= CHN_F_EXCLUSIVE;
  645                         pcm_chnref(wrch, 1);
  646                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  647                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
  648                         CHN_UNLOCK(wrch);
  649                 }
  650         }
  651 
  652 
  653         PCM_LOCK(d);
  654 
  655         /*
  656          * We're done. Allocate channels information for this cdev.
  657          */
  658         switch (volctl) {
  659         case DSP_CDEV_VOLCTL_READ:
  660                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
  661                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
  662                 break;
  663         case DSP_CDEV_VOLCTL_WRITE:
  664                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
  665                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
  666                 break;
  667         case DSP_CDEV_VOLCTL_NONE:
  668         default:
  669                 if (wrch == NULL && rdch == NULL) {
  670                         (void)snd_clone_release(i_dev);
  671                         PCM_RELEASE(d);
  672                         PCM_UNLOCK(d);
  673                         PCM_GIANT_EXIT(d);
  674                         if (wrerror != 0)
  675                                 return (wrerror);
  676                         if (rderror != 0)
  677                                 return (rderror);
  678                         return (EINVAL);
  679                 }
  680                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
  681                 if (rdch != NULL)
  682                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
  683                 if (wrch != NULL)
  684                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
  685                 break;
  686         }
  687 
  688         /*
  689          * Increase clone refcount for its automatic garbage collector.
  690          */
  691         (void)snd_clone_ref(i_dev);
  692 
  693         PCM_RELEASE(d);
  694         PCM_UNLOCK(d);
  695 
  696         PCM_GIANT_LEAVE(d);
  697 
  698         return (0);
  699 }
  700 
  701 static int
  702 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  703 {
  704         struct pcm_channel *rdch, *wrch, *volch;
  705         struct snddev_info *d;
  706         int sg_ids, rdref, wdref;
  707 
  708         d = dsp_get_info(i_dev);
  709         if (!DSP_REGISTERED(d, i_dev))
  710                 return (EBADF);
  711 
  712         PCM_GIANT_ENTER(d);
  713 
  714         PCM_LOCK(d);
  715         PCM_WAIT(d);
  716         PCM_ACQUIRE(d);
  717 
  718         rdch = PCM_RDCH(i_dev);
  719         wrch = PCM_WRCH(i_dev);
  720         volch = PCM_VOLCH(i_dev);
  721 
  722         PCM_RDCH(i_dev) = NULL;
  723         PCM_WRCH(i_dev) = NULL;
  724         PCM_VOLCH(i_dev) = NULL;
  725 
  726         rdref = -1;
  727         wdref = -1;
  728 
  729         if (volch != NULL) {
  730                 if (volch == rdch)
  731                         rdref--;
  732                 else if (volch == wrch)
  733                         wdref--;
  734                 else {
  735                         CHN_LOCK(volch);
  736                         pcm_chnref(volch, -1);
  737                         CHN_UNLOCK(volch);
  738                 }
  739         }
  740 
  741         if (rdch != NULL)
  742                 CHN_REMOVE(d, rdch, channels.pcm.opened);
  743         if (wrch != NULL)
  744                 CHN_REMOVE(d, wrch, channels.pcm.opened);
  745 
  746         if (rdch != NULL || wrch != NULL) {
  747                 PCM_UNLOCK(d);
  748                 if (rdch != NULL) {
  749                         /*
  750                          * The channel itself need not be locked because:
  751                          *   a)  Adding a channel to a syncgroup happens only
  752                          *       in dsp_ioctl(), which cannot run concurrently
  753                          *       to dsp_close().
  754                          *   b)  The syncmember pointer (sm) is protected by
  755                          *       the global syncgroup list lock.
  756                          *   c)  A channel can't just disappear, invalidating
  757                          *       pointers, unless it's closed/dereferenced
  758                          *       first.
  759                          */
  760                         PCM_SG_LOCK();
  761                         sg_ids = chn_syncdestroy(rdch);
  762                         PCM_SG_UNLOCK();
  763                         if (sg_ids != 0)
  764                                 free_unr(pcmsg_unrhdr, sg_ids);
  765 
  766                         CHN_LOCK(rdch);
  767                         pcm_chnref(rdch, rdref);
  768                         chn_abort(rdch); /* won't sleep */
  769                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  770                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  771                         chn_reset(rdch, 0, 0);
  772                         pcm_chnrelease(rdch);
  773                 }
  774                 if (wrch != NULL) {
  775                         /*
  776                          * Please see block above.
  777                          */
  778                         PCM_SG_LOCK();
  779                         sg_ids = chn_syncdestroy(wrch);
  780                         PCM_SG_UNLOCK();
  781                         if (sg_ids != 0)
  782                                 free_unr(pcmsg_unrhdr, sg_ids);
  783 
  784                         CHN_LOCK(wrch);
  785                         pcm_chnref(wrch, wdref);
  786                         chn_flush(wrch); /* may sleep */
  787                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  788                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  789                         chn_reset(wrch, 0, 0);
  790                         pcm_chnrelease(wrch);
  791                 }
  792                 PCM_LOCK(d);
  793         }
  794 
  795         dsp_cdevinfo_free(i_dev);
  796         /*
  797          * Release clone busy state and unref it so the automatic
  798          * garbage collector will get the hint and do the remaining
  799          * cleanup process.
  800          */
  801         (void)snd_clone_release(i_dev);
  802 
  803         /*
  804          * destroy_dev() might sleep, so release pcm lock
  805          * here and rely on pcm cv serialization.
  806          */
  807         PCM_UNLOCK(d);
  808         (void)snd_clone_unref(i_dev);
  809         PCM_LOCK(d);
  810 
  811         PCM_RELEASE(d);
  812         PCM_UNLOCK(d);
  813 
  814         PCM_GIANT_LEAVE(d);
  815 
  816         return (0);
  817 }
  818 
  819 static __inline int
  820 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
  821 {
  822         struct snddev_info *d;
  823         struct pcm_channel **ch, *rdch, *wrch;
  824         int (*chn_io)(struct pcm_channel *, struct uio *);
  825         int prio, ret;
  826         pid_t runpid;
  827 
  828         KASSERT(i_dev != NULL && buf != NULL &&
  829             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
  830             ("%s(): io train wreck!", __func__));
  831 
  832         d = dsp_get_info(i_dev);
  833         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
  834                 return (EBADF);
  835 
  836         PCM_GIANT_ENTER(d);
  837 
  838         switch (buf->uio_rw) {
  839         case UIO_READ:
  840                 prio = SD_F_PRIO_RD;
  841                 ch = &rdch;
  842                 chn_io = chn_read;
  843                 break;
  844         case UIO_WRITE:
  845                 prio = SD_F_PRIO_WR;
  846                 ch = &wrch;
  847                 chn_io = chn_write;
  848                 break;
  849         default:
  850                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
  851                 break;
  852         }
  853 
  854         rdch = NULL;
  855         wrch = NULL;
  856         runpid = buf->uio_td->td_proc->p_pid;
  857 
  858         getchns(i_dev, &rdch, &wrch, prio);
  859 
  860         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
  861                 PCM_GIANT_EXIT(d);
  862                 return (EBADF);
  863         }
  864 
  865         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
  866             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
  867                 relchns(i_dev, rdch, wrch, prio);
  868                 PCM_GIANT_EXIT(d);
  869                 return (EINVAL);
  870         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
  871                 (*ch)->flags |= CHN_F_RUNNING;
  872                 (*ch)->pid = runpid;
  873         }
  874 
  875         /*
  876          * chn_read/write must give up channel lock in order to copy bytes
  877          * from/to userland, so up the "in progress" counter to make sure
  878          * someone else doesn't come along and muss up the buffer.
  879          */
  880         ++(*ch)->inprog;
  881         ret = chn_io(*ch, buf);
  882         --(*ch)->inprog;
  883 
  884         CHN_BROADCAST(&(*ch)->cv);
  885 
  886         relchns(i_dev, rdch, wrch, prio);
  887 
  888         PCM_GIANT_LEAVE(d);
  889 
  890         return (ret);
  891 }
  892 
  893 static int
  894 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
  895 {
  896         return (dsp_io_ops(i_dev, buf));
  897 }
  898 
  899 static int
  900 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
  901 {
  902         return (dsp_io_ops(i_dev, buf));
  903 }
  904 
  905 static int
  906 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
  907 {
  908         struct snddev_info *d;
  909         struct pcm_channel *c;
  910         int unit;
  911 
  912         KASSERT(dev != NULL && volch != NULL,
  913             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
  914 
  915         d = dsp_get_info(dev);
  916         if (!PCM_REGISTERED(d)) {
  917                 *volch = NULL;
  918                 return (EINVAL);
  919         }
  920 
  921         PCM_UNLOCKASSERT(d);
  922 
  923         *volch = NULL;
  924 
  925         c = PCM_VOLCH(dev);
  926         if (c != NULL) {
  927                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
  928                         return (-1);
  929                 *volch = c;
  930                 return (0);
  931         }
  932 
  933         PCM_LOCK(d);
  934         PCM_WAIT(d);
  935         PCM_ACQUIRE(d);
  936 
  937         unit = dev2unit(dev);
  938 
  939         CHN_FOREACH(c, d, channels.pcm) {
  940                 CHN_LOCK(c);
  941                 if (c->unit != unit) {
  942                         CHN_UNLOCK(c);
  943                         continue;
  944                 }
  945                 *volch = c;
  946                 pcm_chnref(c, 1);
  947                 PCM_VOLCH(dev) = c;
  948                 CHN_UNLOCK(c);
  949                 PCM_RELEASE(d);
  950                 PCM_UNLOCK(d);
  951                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
  952         }
  953 
  954         PCM_RELEASE(d);
  955         PCM_UNLOCK(d);
  956 
  957         return (EINVAL);
  958 }
  959 
  960 static int
  961 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
  962     caddr_t arg)
  963 {
  964         struct snddev_info *d;
  965         struct pcm_channel *rdch, *wrch;
  966         int j, devtype, ret;
  967 
  968         d = dsp_get_info(dev);
  969         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
  970                 return (-1);
  971 
  972         PCM_UNLOCKASSERT(d);
  973 
  974         j = cmd & 0xff;
  975 
  976         rdch = PCM_RDCH(dev);
  977         wrch = PCM_WRCH(dev);
  978 
  979         /* No specific channel, look into cache */
  980         if (volch == NULL)
  981                 volch = PCM_VOLCH(dev);
  982 
  983         /* Look harder */
  984         if (volch == NULL) {
  985                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
  986                         volch = rdch;
  987                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
  988                         volch = wrch;
  989         }
  990 
  991         devtype = PCMDEV(dev);
  992 
  993         /* Look super harder */
  994         if (volch == NULL &&
  995             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
  996             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
  997                 ret = dsp_get_volume_channel(dev, &volch);
  998                 if (ret != 0)
  999                         return (ret);
 1000                 if (volch == NULL)
 1001                         return (EINVAL);
 1002         }
 1003 
 1004         /* Final validation */
 1005         if (volch != NULL) {
 1006                 CHN_LOCK(volch);
 1007                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
 1008                         CHN_UNLOCK(volch);
 1009                         return (-1);
 1010                 }
 1011                 if (volch->direction == PCMDIR_PLAY)
 1012                         wrch = volch;
 1013                 else
 1014                         rdch = volch;
 1015         }
 1016 
 1017         ret = EINVAL;
 1018 
 1019         if (volch != NULL &&
 1020             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
 1021             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
 1022                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
 1023                         int left, right, center;
 1024 
 1025                         left = *(int *)arg & 0x7f;
 1026                         right = ((*(int *)arg) >> 8) & 0x7f;
 1027                         center = (left + right) >> 1;
 1028                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
 1029                             center);
 1030                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
 1031                         *(int *)arg = CHN_GETVOLUME(volch,
 1032                                 SND_VOL_C_PCM, SND_CHN_T_FL);
 1033                         *(int *)arg |= CHN_GETVOLUME(volch,
 1034                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
 1035                 }
 1036                 ret = 0;
 1037         } else if (rdch != NULL || wrch != NULL) {
 1038                 switch (j) {
 1039                 case SOUND_MIXER_DEVMASK:
 1040                 case SOUND_MIXER_CAPS:
 1041                 case SOUND_MIXER_STEREODEVS:
 1042                         if ((cmd & ~0xff) == MIXER_READ(0)) {
 1043                                 *(int *)arg = 0;
 1044                                 if (rdch != NULL)
 1045                                         *(int *)arg |= SOUND_MASK_RECLEV;
 1046                                 if (wrch != NULL)
 1047                                         *(int *)arg |= SOUND_MASK_PCM;
 1048                         }
 1049                         ret = 0;
 1050                         break;
 1051                 case SOUND_MIXER_RECMASK:
 1052                 case SOUND_MIXER_RECSRC:
 1053                         if ((cmd & ~0xff) == MIXER_READ(0))
 1054                                 *(int *)arg = 0;
 1055                         ret = 0;
 1056                         break;
 1057                 default:
 1058                         break;
 1059                 }
 1060         }
 1061 
 1062         if (volch != NULL)
 1063                 CHN_UNLOCK(volch);
 1064 
 1065         return (ret);
 1066 }
 1067 
 1068 static int
 1069 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
 1070     struct thread *td)
 1071 {
 1072         struct pcm_channel *chn, *rdch, *wrch;
 1073         struct snddev_info *d;
 1074         u_long xcmd;
 1075         int *arg_i, ret, tmp;
 1076 
 1077         d = dsp_get_info(i_dev);
 1078         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 1079                 return (EBADF);
 1080 
 1081         PCM_GIANT_ENTER(d);
 1082 
 1083         arg_i = (int *)arg;
 1084         ret = 0;
 1085         xcmd = 0;
 1086         chn = NULL;
 1087 
 1088         if (IOCGROUP(cmd) == 'M') {
 1089                 if (cmd == OSS_GETVERSION) {
 1090                         *arg_i = SOUND_VERSION;
 1091                         PCM_GIANT_EXIT(d);
 1092                         return (0);
 1093                 }
 1094                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
 1095                 if (ret != -1) {
 1096                         PCM_GIANT_EXIT(d);
 1097                         return (ret);
 1098                 }
 1099 
 1100                 if (d->mixer_dev != NULL) {
 1101                         PCM_ACQUIRE_QUICK(d);
 1102                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1103                             MIXER_CMD_DIRECT);
 1104                         PCM_RELEASE_QUICK(d);
 1105                 } else
 1106                         ret = EBADF;
 1107 
 1108                 PCM_GIANT_EXIT(d);
 1109 
 1110                 return (ret);
 1111         }
 1112 
 1113         /*
 1114          * Certain ioctls may be made on any type of device (audio, mixer,
 1115          * and MIDI).  Handle those special cases here.
 1116          */
 1117         if (IOCGROUP(cmd) == 'X') {
 1118                 PCM_ACQUIRE_QUICK(d);
 1119                 switch(cmd) {
 1120                 case SNDCTL_SYSINFO:
 1121                         sound_oss_sysinfo((oss_sysinfo *)arg);
 1122                         break;
 1123                 case SNDCTL_CARDINFO:
 1124                         ret = sound_oss_card_info((oss_card_info *)arg);
 1125                         break;
 1126                 case SNDCTL_AUDIOINFO:
 1127                 case SNDCTL_AUDIOINFO_EX:
 1128                 case SNDCTL_ENGINEINFO:
 1129                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
 1130                         break;
 1131                 case SNDCTL_MIXERINFO:
 1132                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
 1133                         break;
 1134                 default:
 1135                         ret = EINVAL;
 1136                 }
 1137                 PCM_RELEASE_QUICK(d);
 1138                 PCM_GIANT_EXIT(d);
 1139                 return (ret);
 1140         }
 1141 
 1142         getchns(i_dev, &rdch, &wrch, 0);
 1143 
 1144         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
 1145                 wrch = NULL;
 1146         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
 1147                 rdch = NULL;
 1148 
 1149         if (wrch == NULL && rdch == NULL) {
 1150                 PCM_GIANT_EXIT(d);
 1151                 return (EINVAL);
 1152         }
 1153 
 1154         switch(cmd) {
 1155 #ifdef OLDPCM_IOCTL
 1156         /*
 1157          * we start with the new ioctl interface.
 1158          */
 1159         case AIONWRITE: /* how many bytes can write ? */
 1160                 if (wrch) {
 1161                         CHN_LOCK(wrch);
 1162 /*
 1163                 if (wrch && wrch->bufhard.dl)
 1164                         while (chn_wrfeed(wrch) == 0);
 1165 */
 1166                         *arg_i = sndbuf_getfree(wrch->bufsoft);
 1167                         CHN_UNLOCK(wrch);
 1168                 } else {
 1169                         *arg_i = 0;
 1170                         ret = EINVAL;
 1171                 }
 1172                 break;
 1173 
 1174         case AIOSSIZE:     /* set the current blocksize */
 1175                 {
 1176                         struct snd_size *p = (struct snd_size *)arg;
 1177 
 1178                         p->play_size = 0;
 1179                         p->rec_size = 0;
 1180                         PCM_ACQUIRE_QUICK(d);
 1181                         if (wrch) {
 1182                                 CHN_LOCK(wrch);
 1183                                 chn_setblocksize(wrch, 2, p->play_size);
 1184                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1185                                 CHN_UNLOCK(wrch);
 1186                         }
 1187                         if (rdch) {
 1188                                 CHN_LOCK(rdch);
 1189                                 chn_setblocksize(rdch, 2, p->rec_size);
 1190                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1191                                 CHN_UNLOCK(rdch);
 1192                         }
 1193                         PCM_RELEASE_QUICK(d);
 1194                 }
 1195                 break;
 1196         case AIOGSIZE:  /* get the current blocksize */
 1197                 {
 1198                         struct snd_size *p = (struct snd_size *)arg;
 1199 
 1200                         if (wrch) {
 1201                                 CHN_LOCK(wrch);
 1202                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1203                                 CHN_UNLOCK(wrch);
 1204                         }
 1205                         if (rdch) {
 1206                                 CHN_LOCK(rdch);
 1207                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1208                                 CHN_UNLOCK(rdch);
 1209                         }
 1210                 }
 1211                 break;
 1212 
 1213         case AIOSFMT:
 1214         case AIOGFMT:
 1215                 {
 1216                         snd_chan_param *p = (snd_chan_param *)arg;
 1217 
 1218                         if (cmd == AIOSFMT &&
 1219                             ((p->play_format != 0 && p->play_rate == 0) ||
 1220                             (p->rec_format != 0 && p->rec_rate == 0))) {
 1221                                 ret = EINVAL;
 1222                                 break;
 1223                         }
 1224                         PCM_ACQUIRE_QUICK(d);
 1225                         if (wrch) {
 1226                                 CHN_LOCK(wrch);
 1227                                 if (cmd == AIOSFMT && p->play_format != 0) {
 1228                                         chn_setformat(wrch,
 1229                                             SND_FORMAT(p->play_format,
 1230                                             AFMT_CHANNEL(wrch->format),
 1231                                             AFMT_EXTCHANNEL(wrch->format)));
 1232                                         chn_setspeed(wrch, p->play_rate);
 1233                                 }
 1234                                 p->play_rate = wrch->speed;
 1235                                 p->play_format = AFMT_ENCODING(wrch->format);
 1236                                 CHN_UNLOCK(wrch);
 1237                         } else {
 1238                                 p->play_rate = 0;
 1239                                 p->play_format = 0;
 1240                         }
 1241                         if (rdch) {
 1242                                 CHN_LOCK(rdch);
 1243                                 if (cmd == AIOSFMT && p->rec_format != 0) {
 1244                                         chn_setformat(rdch,
 1245                                             SND_FORMAT(p->rec_format,
 1246                                             AFMT_CHANNEL(rdch->format),
 1247                                             AFMT_EXTCHANNEL(rdch->format)));
 1248                                         chn_setspeed(rdch, p->rec_rate);
 1249                                 }
 1250                                 p->rec_rate = rdch->speed;
 1251                                 p->rec_format = AFMT_ENCODING(rdch->format);
 1252                                 CHN_UNLOCK(rdch);
 1253                         } else {
 1254                                 p->rec_rate = 0;
 1255                                 p->rec_format = 0;
 1256                         }
 1257                         PCM_RELEASE_QUICK(d);
 1258                 }
 1259                 break;
 1260 
 1261         case AIOGCAP:     /* get capabilities */
 1262                 {
 1263                         snd_capabilities *p = (snd_capabilities *)arg;
 1264                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
 1265                         struct cdev *pdev;
 1266 
 1267                         PCM_LOCK(d);
 1268                         if (rdch) {
 1269                                 CHN_LOCK(rdch);
 1270                                 rcaps = chn_getcaps(rdch);
 1271                         }
 1272                         if (wrch) {
 1273                                 CHN_LOCK(wrch);
 1274                                 pcaps = chn_getcaps(wrch);
 1275                         }
 1276                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
 1277                                           pcaps? pcaps->minspeed : 0);
 1278                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
 1279                                           pcaps? pcaps->maxspeed : 1000000);
 1280                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
 1281                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
 1282                         /* XXX bad on sb16 */
 1283                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
 1284                                      (wrch? chn_getformats(wrch) : 0xffffffff);
 1285                         if (rdch && wrch)
 1286                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
 1287                         pdev = d->mixer_dev;
 1288                         p->mixers = 1; /* default: one mixer */
 1289                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
 1290                         p->left = p->right = 100;
 1291                         if (wrch)
 1292                                 CHN_UNLOCK(wrch);
 1293                         if (rdch)
 1294                                 CHN_UNLOCK(rdch);
 1295                         PCM_UNLOCK(d);
 1296                 }
 1297                 break;
 1298 
 1299         case AIOSTOP:
 1300                 if (*arg_i == AIOSYNC_PLAY && wrch) {
 1301                         CHN_LOCK(wrch);
 1302                         *arg_i = chn_abort(wrch);
 1303                         CHN_UNLOCK(wrch);
 1304                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
 1305                         CHN_LOCK(rdch);
 1306                         *arg_i = chn_abort(rdch);
 1307                         CHN_UNLOCK(rdch);
 1308                 } else {
 1309                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 1310                         *arg_i = 0;
 1311                 }
 1312                 break;
 1313 
 1314         case AIOSYNC:
 1315                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
 1316                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
 1317                 break;
 1318 #endif
 1319         /*
 1320          * here follow the standard ioctls (filio.h etc.)
 1321          */
 1322         case FIONREAD: /* get # bytes to read */
 1323                 if (rdch) {
 1324                         CHN_LOCK(rdch);
 1325 /*                      if (rdch && rdch->bufhard.dl)
 1326                                 while (chn_rdfeed(rdch) == 0);
 1327 */
 1328                         *arg_i = sndbuf_getready(rdch->bufsoft);
 1329                         CHN_UNLOCK(rdch);
 1330                 } else {
 1331                         *arg_i = 0;
 1332                         ret = EINVAL;
 1333                 }
 1334                 break;
 1335 
 1336         case FIOASYNC: /*set/clear async i/o */
 1337                 DEB( printf("FIOASYNC\n") ; )
 1338                 break;
 1339 
 1340         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
 1341         case FIONBIO: /* set/clear non-blocking i/o */
 1342                 if (rdch) {
 1343                         CHN_LOCK(rdch);
 1344                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1345                                 rdch->flags |= CHN_F_NBIO;
 1346                         else
 1347                                 rdch->flags &= ~CHN_F_NBIO;
 1348                         CHN_UNLOCK(rdch);
 1349                 }
 1350                 if (wrch) {
 1351                         CHN_LOCK(wrch);
 1352                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1353                                 wrch->flags |= CHN_F_NBIO;
 1354                         else
 1355                                 wrch->flags &= ~CHN_F_NBIO;
 1356                         CHN_UNLOCK(wrch);
 1357                 }
 1358                 break;
 1359 
 1360         /*
 1361          * Finally, here is the linux-compatible ioctl interface
 1362          */
 1363 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
 1364         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
 1365         case SNDCTL_DSP_GETBLKSIZE:
 1366                 chn = wrch ? wrch : rdch;
 1367                 if (chn) {
 1368                         CHN_LOCK(chn);
 1369                         *arg_i = sndbuf_getblksz(chn->bufsoft);
 1370                         CHN_UNLOCK(chn);
 1371                 } else {
 1372                         *arg_i = 0;
 1373                         ret = EINVAL;
 1374                 }
 1375                 break;
 1376 
 1377         case SNDCTL_DSP_SETBLKSIZE:
 1378                 RANGE(*arg_i, 16, 65536);
 1379                 PCM_ACQUIRE_QUICK(d);
 1380                 if (wrch) {
 1381                         CHN_LOCK(wrch);
 1382                         chn_setblocksize(wrch, 2, *arg_i);
 1383                         CHN_UNLOCK(wrch);
 1384                 }
 1385                 if (rdch) {
 1386                         CHN_LOCK(rdch);
 1387                         chn_setblocksize(rdch, 2, *arg_i);
 1388                         CHN_UNLOCK(rdch);
 1389                 }
 1390                 PCM_RELEASE_QUICK(d);
 1391                 break;
 1392 
 1393         case SNDCTL_DSP_RESET:
 1394                 DEB(printf("dsp reset\n"));
 1395                 if (wrch) {
 1396                         CHN_LOCK(wrch);
 1397                         chn_abort(wrch);
 1398                         chn_resetbuf(wrch);
 1399                         CHN_UNLOCK(wrch);
 1400                 }
 1401                 if (rdch) {
 1402                         CHN_LOCK(rdch);
 1403                         chn_abort(rdch);
 1404                         chn_resetbuf(rdch);
 1405                         CHN_UNLOCK(rdch);
 1406                 }
 1407                 break;
 1408 
 1409         case SNDCTL_DSP_SYNC:
 1410                 DEB(printf("dsp sync\n"));
 1411                 /* chn_sync may sleep */
 1412                 if (wrch) {
 1413                         CHN_LOCK(wrch);
 1414                         chn_sync(wrch, 0);
 1415                         CHN_UNLOCK(wrch);
 1416                 }
 1417                 break;
 1418 
 1419         case SNDCTL_DSP_SPEED:
 1420                 /* chn_setspeed may sleep */
 1421                 tmp = 0;
 1422                 PCM_ACQUIRE_QUICK(d);
 1423                 if (wrch) {
 1424                         CHN_LOCK(wrch);
 1425                         ret = chn_setspeed(wrch, *arg_i);
 1426                         tmp = wrch->speed;
 1427                         CHN_UNLOCK(wrch);
 1428                 }
 1429                 if (rdch && ret == 0) {
 1430                         CHN_LOCK(rdch);
 1431                         ret = chn_setspeed(rdch, *arg_i);
 1432                         if (tmp == 0)
 1433                                 tmp = rdch->speed;
 1434                         CHN_UNLOCK(rdch);
 1435                 }
 1436                 PCM_RELEASE_QUICK(d);
 1437                 *arg_i = tmp;
 1438                 break;
 1439 
 1440         case SOUND_PCM_READ_RATE:
 1441                 chn = wrch ? wrch : rdch;
 1442                 if (chn) {
 1443                         CHN_LOCK(chn);
 1444                         *arg_i = chn->speed;
 1445                         CHN_UNLOCK(chn);
 1446                 } else {
 1447                         *arg_i = 0;
 1448                         ret = EINVAL;
 1449                 }
 1450                 break;
 1451 
 1452         case SNDCTL_DSP_STEREO:
 1453                 tmp = -1;
 1454                 *arg_i = (*arg_i)? 2 : 1;
 1455                 PCM_ACQUIRE_QUICK(d);
 1456                 if (wrch) {
 1457                         CHN_LOCK(wrch);
 1458                         ret = chn_setformat(wrch,
 1459                             SND_FORMAT(wrch->format, *arg_i, 0));
 1460                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
 1461                         CHN_UNLOCK(wrch);
 1462                 }
 1463                 if (rdch && ret == 0) {
 1464                         CHN_LOCK(rdch);
 1465                         ret = chn_setformat(rdch,
 1466                             SND_FORMAT(rdch->format, *arg_i, 0));
 1467                         if (tmp == -1)
 1468                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
 1469                         CHN_UNLOCK(rdch);
 1470                 }
 1471                 PCM_RELEASE_QUICK(d);
 1472                 *arg_i = tmp;
 1473                 break;
 1474 
 1475         case SOUND_PCM_WRITE_CHANNELS:
 1476 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
 1477                 if (*arg_i < 0) {
 1478                         *arg_i = 0;
 1479                         ret = EINVAL;
 1480                         break;
 1481                 }
 1482                 if (*arg_i != 0) {
 1483                         struct pcmchan_matrix *m;
 1484                         uint32_t ext;
 1485 
 1486                         tmp = 0;
 1487                         if (*arg_i > SND_CHN_MAX)
 1488                                 *arg_i = SND_CHN_MAX;
 1489 
 1490                         m = feeder_matrix_default_channel_map(*arg_i);
 1491                         if (m != NULL)
 1492                                 ext = m->ext;
 1493                         else
 1494                                 ext = 0;
 1495 
 1496                         PCM_ACQUIRE_QUICK(d);
 1497                         if (wrch) {
 1498                                 CHN_LOCK(wrch);
 1499                                 ret = chn_setformat(wrch,
 1500                                     SND_FORMAT(wrch->format, *arg_i, ext));
 1501                                 tmp = AFMT_CHANNEL(wrch->format);
 1502                                 CHN_UNLOCK(wrch);
 1503                         }
 1504                         if (rdch && ret == 0) {
 1505                                 CHN_LOCK(rdch);
 1506                                 ret = chn_setformat(rdch,
 1507                                     SND_FORMAT(rdch->format, *arg_i, ext));
 1508                                 if (tmp == 0)
 1509                                         tmp = AFMT_CHANNEL(rdch->format);
 1510                                 CHN_UNLOCK(rdch);
 1511                         }
 1512                         PCM_RELEASE_QUICK(d);
 1513                         *arg_i = tmp;
 1514                 } else {
 1515                         chn = wrch ? wrch : rdch;
 1516                         CHN_LOCK(chn);
 1517                         *arg_i = AFMT_CHANNEL(chn->format);
 1518                         CHN_UNLOCK(chn);
 1519                 }
 1520                 break;
 1521 
 1522         case SOUND_PCM_READ_CHANNELS:
 1523                 chn = wrch ? wrch : rdch;
 1524                 if (chn) {
 1525                         CHN_LOCK(chn);
 1526                         *arg_i = AFMT_CHANNEL(chn->format);
 1527                         CHN_UNLOCK(chn);
 1528                 } else {
 1529                         *arg_i = 0;
 1530                         ret = EINVAL;
 1531                 }
 1532                 break;
 1533 
 1534         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
 1535                 chn = wrch ? wrch : rdch;
 1536                 if (chn) {
 1537                         CHN_LOCK(chn);
 1538                         *arg_i = chn_getformats(chn);
 1539                         CHN_UNLOCK(chn);
 1540                 } else {
 1541                         *arg_i = 0;
 1542                         ret = EINVAL;
 1543                 }
 1544                 break;
 1545 
 1546         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
 1547                 if (*arg_i != AFMT_QUERY) {
 1548                         tmp = 0;
 1549                         PCM_ACQUIRE_QUICK(d);
 1550                         if (wrch) {
 1551                                 CHN_LOCK(wrch);
 1552                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
 1553                                     AFMT_CHANNEL(wrch->format),
 1554                                     AFMT_EXTCHANNEL(wrch->format)));
 1555                                 tmp = wrch->format;
 1556                                 CHN_UNLOCK(wrch);
 1557                         }
 1558                         if (rdch && ret == 0) {
 1559                                 CHN_LOCK(rdch);
 1560                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
 1561                                     AFMT_CHANNEL(rdch->format),
 1562                                     AFMT_EXTCHANNEL(rdch->format)));
 1563                                 if (tmp == 0)
 1564                                         tmp = rdch->format;
 1565                                 CHN_UNLOCK(rdch);
 1566                         }
 1567                         PCM_RELEASE_QUICK(d);
 1568                         *arg_i = AFMT_ENCODING(tmp);
 1569                 } else {
 1570                         chn = wrch ? wrch : rdch;
 1571                         CHN_LOCK(chn);
 1572                         *arg_i = AFMT_ENCODING(chn->format);
 1573                         CHN_UNLOCK(chn);
 1574                 }
 1575                 break;
 1576 
 1577         case SNDCTL_DSP_SETFRAGMENT:
 1578                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
 1579                 {
 1580                         uint32_t fragln = (*arg_i) & 0x0000ffff;
 1581                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
 1582                         uint32_t fragsz;
 1583                         uint32_t r_maxfrags, r_fragsz;
 1584 
 1585                         RANGE(fragln, 4, 16);
 1586                         fragsz = 1 << fragln;
 1587 
 1588                         if (maxfrags == 0)
 1589                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1590                         if (maxfrags < 2)
 1591                                 maxfrags = 2;
 1592                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
 1593                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1594 
 1595                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
 1596                         PCM_ACQUIRE_QUICK(d);
 1597                         if (rdch) {
 1598                                 CHN_LOCK(rdch);
 1599                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
 1600                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
 1601                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
 1602                                 CHN_UNLOCK(rdch);
 1603                         } else {
 1604                                 r_maxfrags = maxfrags;
 1605                                 r_fragsz = fragsz;
 1606                         }
 1607                         if (wrch && ret == 0) {
 1608                                 CHN_LOCK(wrch);
 1609                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
 1610                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
 1611                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
 1612                                 CHN_UNLOCK(wrch);
 1613                         } else { /* use whatever came from the read channel */
 1614                                 maxfrags = r_maxfrags;
 1615                                 fragsz = r_fragsz;
 1616                         }
 1617                         PCM_RELEASE_QUICK(d);
 1618 
 1619                         fragln = 0;
 1620                         while (fragsz > 1) {
 1621                                 fragln++;
 1622                                 fragsz >>= 1;
 1623                         }
 1624                         *arg_i = (maxfrags << 16) | fragln;
 1625                 }
 1626                 break;
 1627 
 1628         case SNDCTL_DSP_GETISPACE:
 1629                 /* return the size of data available in the input queue */
 1630                 {
 1631                         audio_buf_info *a = (audio_buf_info *)arg;
 1632                         if (rdch) {
 1633                                 struct snd_dbuf *bs = rdch->bufsoft;
 1634 
 1635                                 CHN_LOCK(rdch);
 1636                                 a->bytes = sndbuf_getready(bs);
 1637                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1638                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1639                                 a->fragsize = sndbuf_getblksz(bs);
 1640                                 CHN_UNLOCK(rdch);
 1641                         } else
 1642                                 ret = EINVAL;
 1643                 }
 1644                 break;
 1645 
 1646         case SNDCTL_DSP_GETOSPACE:
 1647                 /* return space available in the output queue */
 1648                 {
 1649                         audio_buf_info *a = (audio_buf_info *)arg;
 1650                         if (wrch) {
 1651                                 struct snd_dbuf *bs = wrch->bufsoft;
 1652 
 1653                                 CHN_LOCK(wrch);
 1654                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1655                                 a->bytes = sndbuf_getfree(bs);
 1656                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1657                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1658                                 a->fragsize = sndbuf_getblksz(bs);
 1659                                 CHN_UNLOCK(wrch);
 1660                         } else
 1661                                 ret = EINVAL;
 1662                 }
 1663                 break;
 1664 
 1665         case SNDCTL_DSP_GETIPTR:
 1666                 {
 1667                         count_info *a = (count_info *)arg;
 1668                         if (rdch) {
 1669                                 struct snd_dbuf *bs = rdch->bufsoft;
 1670 
 1671                                 CHN_LOCK(rdch);
 1672                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
 1673                                 a->bytes = sndbuf_gettotal(bs);
 1674                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
 1675                                 a->ptr = sndbuf_getfreeptr(bs);
 1676                                 rdch->blocks = sndbuf_getblocks(bs);
 1677                                 CHN_UNLOCK(rdch);
 1678                         } else
 1679                                 ret = EINVAL;
 1680                 }
 1681                 break;
 1682 
 1683         case SNDCTL_DSP_GETOPTR:
 1684                 {
 1685                         count_info *a = (count_info *)arg;
 1686                         if (wrch) {
 1687                                 struct snd_dbuf *bs = wrch->bufsoft;
 1688 
 1689                                 CHN_LOCK(wrch);
 1690                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1691                                 a->bytes = sndbuf_gettotal(bs);
 1692                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
 1693                                 a->ptr = sndbuf_getreadyptr(bs);
 1694                                 wrch->blocks = sndbuf_getblocks(bs);
 1695                                 CHN_UNLOCK(wrch);
 1696                         } else
 1697                                 ret = EINVAL;
 1698                 }
 1699                 break;
 1700 
 1701         case SNDCTL_DSP_GETCAPS:
 1702                 PCM_LOCK(d);
 1703                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
 1704                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1705                         *arg_i |= PCM_CAP_DUPLEX;
 1706                 if (rdch && (rdch->flags & CHN_F_VIRTUAL) != 0)
 1707                         *arg_i |= PCM_CAP_VIRTUAL;
 1708                 if (wrch && (wrch->flags & CHN_F_VIRTUAL) != 0)
 1709                         *arg_i |= PCM_CAP_VIRTUAL;
 1710                 PCM_UNLOCK(d);
 1711                 break;
 1712 
 1713         case SOUND_PCM_READ_BITS:
 1714                 chn = wrch ? wrch : rdch;
 1715                 if (chn) {
 1716                         CHN_LOCK(chn);
 1717                         if (chn->format & AFMT_8BIT)
 1718                                 *arg_i = 8;
 1719                         else if (chn->format & AFMT_16BIT)
 1720                                 *arg_i = 16;
 1721                         else if (chn->format & AFMT_24BIT)
 1722                                 *arg_i = 24;
 1723                         else if (chn->format & AFMT_32BIT)
 1724                                 *arg_i = 32;
 1725                         else
 1726                                 ret = EINVAL;
 1727                         CHN_UNLOCK(chn);
 1728                 } else {
 1729                         *arg_i = 0;
 1730                         ret = EINVAL;
 1731                 }
 1732                 break;
 1733 
 1734         case SNDCTL_DSP_SETTRIGGER:
 1735                 if (rdch) {
 1736                         CHN_LOCK(rdch);
 1737                         rdch->flags &= ~CHN_F_NOTRIGGER;
 1738                         if (*arg_i & PCM_ENABLE_INPUT)
 1739                                 chn_start(rdch, 1);
 1740                         else {
 1741                                 chn_abort(rdch);
 1742                                 chn_resetbuf(rdch);
 1743                                 rdch->flags |= CHN_F_NOTRIGGER;
 1744                         }
 1745                         CHN_UNLOCK(rdch);
 1746                 }
 1747                 if (wrch) {
 1748                         CHN_LOCK(wrch);
 1749                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1750                         if (*arg_i & PCM_ENABLE_OUTPUT)
 1751                                 chn_start(wrch, 1);
 1752                         else {
 1753                                 chn_abort(wrch);
 1754                                 chn_resetbuf(wrch);
 1755                                 wrch->flags |= CHN_F_NOTRIGGER;
 1756                         }
 1757                         CHN_UNLOCK(wrch);
 1758                 }
 1759                 break;
 1760 
 1761         case SNDCTL_DSP_GETTRIGGER:
 1762                 *arg_i = 0;
 1763                 if (wrch) {
 1764                         CHN_LOCK(wrch);
 1765                         if (wrch->flags & CHN_F_TRIGGERED)
 1766                                 *arg_i |= PCM_ENABLE_OUTPUT;
 1767                         CHN_UNLOCK(wrch);
 1768                 }
 1769                 if (rdch) {
 1770                         CHN_LOCK(rdch);
 1771                         if (rdch->flags & CHN_F_TRIGGERED)
 1772                                 *arg_i |= PCM_ENABLE_INPUT;
 1773                         CHN_UNLOCK(rdch);
 1774                 }
 1775                 break;
 1776 
 1777         case SNDCTL_DSP_GETODELAY:
 1778                 if (wrch) {
 1779                         struct snd_dbuf *bs = wrch->bufsoft;
 1780 
 1781                         CHN_LOCK(wrch);
 1782                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1783                         *arg_i = sndbuf_getready(bs);
 1784                         CHN_UNLOCK(wrch);
 1785                 } else
 1786                         ret = EINVAL;
 1787                 break;
 1788 
 1789         case SNDCTL_DSP_POST:
 1790                 if (wrch) {
 1791                         CHN_LOCK(wrch);
 1792                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1793                         chn_start(wrch, 1);
 1794                         CHN_UNLOCK(wrch);
 1795                 }
 1796                 break;
 1797 
 1798         case SNDCTL_DSP_SETDUPLEX:
 1799                 /*
 1800                  * switch to full-duplex mode if card is in half-duplex
 1801                  * mode and is able to work in full-duplex mode
 1802                  */
 1803                 PCM_LOCK(d);
 1804                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1805                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
 1806                 PCM_UNLOCK(d);
 1807                 break;
 1808 
 1809         /*
 1810          * The following four ioctls are simple wrappers around mixer_ioctl
 1811          * with no further processing.  xcmd is short for "translated
 1812          * command".
 1813          */
 1814         case SNDCTL_DSP_GETRECVOL:
 1815                 if (xcmd == 0) {
 1816                         xcmd = SOUND_MIXER_READ_RECLEV;
 1817                         chn = rdch;
 1818                 }
 1819                 /* FALLTHROUGH */
 1820         case SNDCTL_DSP_SETRECVOL:
 1821                 if (xcmd == 0) {
 1822                         xcmd = SOUND_MIXER_WRITE_RECLEV;
 1823                         chn = rdch;
 1824                 }
 1825                 /* FALLTHROUGH */
 1826         case SNDCTL_DSP_GETPLAYVOL:
 1827                 if (xcmd == 0) {
 1828                         xcmd = SOUND_MIXER_READ_PCM;
 1829                         chn = wrch;
 1830                 }
 1831                 /* FALLTHROUGH */
 1832         case SNDCTL_DSP_SETPLAYVOL:
 1833                 if (xcmd == 0) {
 1834                         xcmd = SOUND_MIXER_WRITE_PCM;
 1835                         chn = wrch;
 1836                 }
 1837 
 1838                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
 1839                 if (ret != -1) {
 1840                         PCM_GIANT_EXIT(d);
 1841                         return (ret);
 1842                 }
 1843 
 1844                 if (d->mixer_dev != NULL) {
 1845                         PCM_ACQUIRE_QUICK(d);
 1846                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
 1847                             MIXER_CMD_DIRECT);
 1848                         PCM_RELEASE_QUICK(d);
 1849                 } else
 1850                         ret = ENOTSUP;
 1851 
 1852                 break;
 1853 
 1854         case SNDCTL_DSP_GET_RECSRC_NAMES:
 1855         case SNDCTL_DSP_GET_RECSRC:
 1856         case SNDCTL_DSP_SET_RECSRC:
 1857                 if (d->mixer_dev != NULL) {
 1858                         PCM_ACQUIRE_QUICK(d);
 1859                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1860                             MIXER_CMD_DIRECT);
 1861                         PCM_RELEASE_QUICK(d);
 1862                 } else
 1863                         ret = ENOTSUP;
 1864                 break;
 1865 
 1866         /*
 1867          * The following 3 ioctls aren't very useful at the moment.  For
 1868          * now, only a single channel is associated with a cdev (/dev/dspN
 1869          * instance), so there's only a single output routing to use (i.e.,
 1870          * the wrch bound to this cdev).
 1871          */
 1872         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
 1873                 {
 1874                         oss_mixer_enuminfo *ei;
 1875                         ei = (oss_mixer_enuminfo *)arg;
 1876                         ei->dev = 0;
 1877                         ei->ctrl = 0;
 1878                         ei->version = 0; /* static for now */
 1879                         ei->strindex[0] = 0;
 1880 
 1881                         if (wrch != NULL) {
 1882                                 ei->nvalues = 1;
 1883                                 strlcpy(ei->strings, wrch->name,
 1884                                         sizeof(ei->strings));
 1885                         } else {
 1886                                 ei->nvalues = 0;
 1887                                 ei->strings[0] = '\0';
 1888                         }
 1889                 }
 1890                 break;
 1891         case SNDCTL_DSP_GET_PLAYTGT:
 1892         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
 1893                 /*
 1894                  * Re: SET_PLAYTGT
 1895                  *   OSSv4: "The value that was accepted by the device will
 1896                  *   be returned back in the variable pointed by the
 1897                  *   argument."
 1898                  */
 1899                 if (wrch != NULL)
 1900                         *arg_i = 0;
 1901                 else
 1902                         ret = EINVAL;
 1903                 break;
 1904 
 1905         case SNDCTL_DSP_SILENCE:
 1906         /*
 1907          * Flush the software (pre-feed) buffer, but try to minimize playback
 1908          * interruption.  (I.e., record unplayed samples with intent to
 1909          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
 1910          * functionality.
 1911          */
 1912                 if (wrch == NULL)
 1913                         ret = EINVAL;
 1914                 else {
 1915                         struct snd_dbuf *bs;
 1916                         CHN_LOCK(wrch);
 1917                         while (wrch->inprog != 0)
 1918                                 cv_wait(&wrch->cv, wrch->lock);
 1919                         bs = wrch->bufsoft;
 1920                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
 1921                                 bs->sl = sndbuf_getready(bs);
 1922                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
 1923                                 sndbuf_fillsilence(bs);
 1924                                 chn_start(wrch, 0);
 1925                         }
 1926                         CHN_UNLOCK(wrch);
 1927                 }
 1928                 break;
 1929 
 1930         case SNDCTL_DSP_SKIP:
 1931         /*
 1932          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
 1933          * playback buffer by moving the current write position immediately
 1934          * before the point where the device is currently reading the samples."
 1935          */
 1936                 if (wrch == NULL)
 1937                         ret = EINVAL;
 1938                 else {
 1939                         struct snd_dbuf *bs;
 1940                         CHN_LOCK(wrch);
 1941                         while (wrch->inprog != 0)
 1942                                 cv_wait(&wrch->cv, wrch->lock);
 1943                         bs = wrch->bufsoft;
 1944                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
 1945                                 sndbuf_softreset(bs);
 1946                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
 1947                                 bs->sl = 0;
 1948                                 chn_start(wrch, 0);
 1949                         }
 1950                         CHN_UNLOCK(wrch);
 1951                 }
 1952                 break;
 1953 
 1954         case SNDCTL_DSP_CURRENT_OPTR:
 1955         case SNDCTL_DSP_CURRENT_IPTR:
 1956         /**
 1957          * @note Changing formats resets the buffer counters, which differs
 1958          *       from the 4Front drivers.  However, I don't expect this to be
 1959          *       much of a problem.
 1960          *
 1961          * @note In a test where @c CURRENT_OPTR is called immediately after write
 1962          *       returns, this driver is about 32K samples behind whereas
 1963          *       4Front's is about 8K samples behind.  Should determine source
 1964          *       of discrepancy, even if only out of curiosity.
 1965          *
 1966          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
 1967          */
 1968                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
 1969                 if (chn == NULL) 
 1970                         ret = EINVAL;
 1971                 else {
 1972                         struct snd_dbuf *bs;
 1973                         /* int tmp; */
 1974 
 1975                         oss_count_t *oc = (oss_count_t *)arg;
 1976 
 1977                         CHN_LOCK(chn);
 1978                         bs = chn->bufsoft;
 1979 #if 0
 1980                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
 1981                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
 1982                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
 1983 #else
 1984                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
 1985                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
 1986 #endif
 1987                         CHN_UNLOCK(chn);
 1988                 }
 1989                 break;
 1990 
 1991         case SNDCTL_DSP_HALT_OUTPUT:
 1992         case SNDCTL_DSP_HALT_INPUT:
 1993                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
 1994                 if (chn == NULL)
 1995                         ret = EINVAL;
 1996                 else {
 1997                         CHN_LOCK(chn);
 1998                         chn_abort(chn);
 1999                         CHN_UNLOCK(chn);
 2000                 }
 2001                 break;
 2002 
 2003         case SNDCTL_DSP_LOW_WATER:
 2004         /*
 2005          * Set the number of bytes required to attract attention by
 2006          * select/poll.
 2007          */
 2008                 if (wrch != NULL) {
 2009                         CHN_LOCK(wrch);
 2010                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
 2011                         CHN_UNLOCK(wrch);
 2012                 }
 2013                 if (rdch != NULL) {
 2014                         CHN_LOCK(rdch);
 2015                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
 2016                         CHN_UNLOCK(rdch);
 2017                 }
 2018                 break;
 2019 
 2020         case SNDCTL_DSP_GETERROR:
 2021         /*
 2022          * OSSv4 docs:  "All errors and counters will automatically be
 2023          * cleared to zeroes after the call so each call will return only
 2024          * the errors that occurred after the previous invocation. ... The
 2025          * play_underruns and rec_overrun fields are the only useful fields
 2026          * returned by OSS 4.0."
 2027          */
 2028                 {
 2029                         audio_errinfo *ei = (audio_errinfo *)arg;
 2030 
 2031                         bzero((void *)ei, sizeof(*ei));
 2032 
 2033                         if (wrch != NULL) {
 2034                                 CHN_LOCK(wrch);
 2035                                 ei->play_underruns = wrch->xruns;
 2036                                 wrch->xruns = 0;
 2037                                 CHN_UNLOCK(wrch);
 2038                         }
 2039                         if (rdch != NULL) {
 2040                                 CHN_LOCK(rdch);
 2041                                 ei->rec_overruns = rdch->xruns;
 2042                                 rdch->xruns = 0;
 2043                                 CHN_UNLOCK(rdch);
 2044                         }
 2045                 }
 2046                 break;
 2047 
 2048         case SNDCTL_DSP_SYNCGROUP:
 2049                 PCM_ACQUIRE_QUICK(d);
 2050                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
 2051                 PCM_RELEASE_QUICK(d);
 2052                 break;
 2053 
 2054         case SNDCTL_DSP_SYNCSTART:
 2055                 PCM_ACQUIRE_QUICK(d);
 2056                 ret = dsp_oss_syncstart(*arg_i);
 2057                 PCM_RELEASE_QUICK(d);
 2058                 break;
 2059 
 2060         case SNDCTL_DSP_POLICY:
 2061                 PCM_ACQUIRE_QUICK(d);
 2062                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
 2063                 PCM_RELEASE_QUICK(d);
 2064                 break;
 2065 
 2066         case SNDCTL_DSP_COOKEDMODE:
 2067                 PCM_ACQUIRE_QUICK(d);
 2068                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
 2069                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
 2070                 PCM_RELEASE_QUICK(d);
 2071                 break;
 2072         case SNDCTL_DSP_GET_CHNORDER:
 2073                 PCM_ACQUIRE_QUICK(d);
 2074                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
 2075                 PCM_RELEASE_QUICK(d);
 2076                 break;
 2077         case SNDCTL_DSP_SET_CHNORDER:
 2078                 PCM_ACQUIRE_QUICK(d);
 2079                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
 2080                 PCM_RELEASE_QUICK(d);
 2081                 break;
 2082         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
 2083                 PCM_ACQUIRE_QUICK(d);
 2084                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
 2085                 PCM_RELEASE_QUICK(d);
 2086                 break;
 2087         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
 2088                 ret = EINVAL;
 2089                 break;
 2090 #ifdef  OSSV4_EXPERIMENT
 2091         /*
 2092          * XXX The following ioctls are not yet supported and just return
 2093          * EINVAL.
 2094          */
 2095         case SNDCTL_DSP_GETOPEAKS:
 2096         case SNDCTL_DSP_GETIPEAKS:
 2097                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
 2098                 if (chn == NULL)
 2099                         ret = EINVAL;
 2100                 else {
 2101                         oss_peaks_t *op = (oss_peaks_t *)arg;
 2102                         int lpeak, rpeak;
 2103 
 2104                         CHN_LOCK(chn);
 2105                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
 2106                         if (ret == -1)
 2107                                 ret = EINVAL;
 2108                         else {
 2109                                 (*op)[0] = lpeak;
 2110                                 (*op)[1] = rpeak;
 2111                         }
 2112                         CHN_UNLOCK(chn);
 2113                 }
 2114                 break;
 2115 
 2116         /*
 2117          * XXX Once implemented, revisit this for proper cv protection
 2118          *     (if necessary).
 2119          */
 2120         case SNDCTL_GETLABEL:
 2121                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
 2122                 break;
 2123         case SNDCTL_SETLABEL:
 2124                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
 2125                 break;
 2126         case SNDCTL_GETSONG:
 2127                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
 2128                 break;
 2129         case SNDCTL_SETSONG:
 2130                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
 2131                 break;
 2132         case SNDCTL_SETNAME:
 2133                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
 2134                 break;
 2135 #if 0
 2136         /**
 2137          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
 2138          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
 2139          * 4Front Technologies.
 2140          */
 2141         case SNDCTL_DSP_READCTL:
 2142         case SNDCTL_DSP_WRITECTL:
 2143                 ret = EINVAL;
 2144                 break;
 2145 #endif  /* !0 (explicitly omitted ioctls) */
 2146 
 2147 #endif  /* !OSSV4_EXPERIMENT */
 2148         case SNDCTL_DSP_MAPINBUF:
 2149         case SNDCTL_DSP_MAPOUTBUF:
 2150         case SNDCTL_DSP_SETSYNCRO:
 2151                 /* undocumented */
 2152 
 2153         case SNDCTL_DSP_SUBDIVIDE:
 2154         case SOUND_PCM_WRITE_FILTER:
 2155         case SOUND_PCM_READ_FILTER:
 2156                 /* dunno what these do, don't sound important */
 2157 
 2158         default:
 2159                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
 2160                 ret = EINVAL;
 2161                 break;
 2162         }
 2163 
 2164         PCM_GIANT_LEAVE(d);
 2165 
 2166         return (ret);
 2167 }
 2168 
 2169 static int
 2170 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
 2171 {
 2172         struct snddev_info *d;
 2173         struct pcm_channel *wrch, *rdch;
 2174         int ret, e;
 2175 
 2176         d = dsp_get_info(i_dev);
 2177         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev)) {
 2178                 /* XXX many clients don't understand POLLNVAL */
 2179                 return (events & (POLLHUP | POLLPRI | POLLIN |
 2180                     POLLRDNORM | POLLOUT | POLLWRNORM));
 2181         }
 2182         PCM_GIANT_ENTER(d);
 2183 
 2184         wrch = NULL;
 2185         rdch = NULL;
 2186         ret = 0;
 2187 
 2188         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2189 
 2190         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
 2191                 e = (events & (POLLOUT | POLLWRNORM));
 2192                 if (e)
 2193                         ret |= chn_poll(wrch, e, td);
 2194         }
 2195 
 2196         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
 2197                 e = (events & (POLLIN | POLLRDNORM));
 2198                 if (e)
 2199                         ret |= chn_poll(rdch, e, td);
 2200         }
 2201 
 2202         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2203 
 2204         PCM_GIANT_LEAVE(d);
 2205 
 2206         return (ret);
 2207 }
 2208 
 2209 static int
 2210 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
 2211     int nprot, vm_memattr_t *memattr)
 2212 {
 2213 
 2214         /*
 2215          * offset is in range due to checks in dsp_mmap_single().
 2216          * XXX memattr is not honored.
 2217          */
 2218         *paddr = vtophys(offset);
 2219         return (0);
 2220 }
 2221 
 2222 static int
 2223 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
 2224     vm_size_t size, struct vm_object **object, int nprot)
 2225 {
 2226         struct snddev_info *d;
 2227         struct pcm_channel *wrch, *rdch, *c;
 2228 
 2229         /*
 2230          * Reject PROT_EXEC by default. It just doesn't makes sense.
 2231          * Unfortunately, we have to give up this one due to linux_mmap
 2232          * changes.
 2233          *
 2234          * https://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
 2235          *
 2236          */
 2237 #ifdef SV_ABI_LINUX
 2238         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
 2239             (dsp_mmap_allow_prot_exec == 0 &&
 2240             SV_CURPROC_ABI() != SV_ABI_LINUX)))
 2241 #else
 2242         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
 2243 #endif
 2244                 return (EINVAL);
 2245 
 2246         /*
 2247          * PROT_READ (alone) selects the input buffer.
 2248          * PROT_WRITE (alone) selects the output buffer.
 2249          * PROT_WRITE|PROT_READ together select the output buffer.
 2250          */
 2251         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
 2252                 return (EINVAL);
 2253 
 2254         d = dsp_get_info(i_dev);
 2255         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 2256                 return (EINVAL);
 2257 
 2258         PCM_GIANT_ENTER(d);
 2259 
 2260         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2261 
 2262         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
 2263         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
 2264             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
 2265             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
 2266             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
 2267                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2268                 PCM_GIANT_EXIT(d);
 2269                 return (EINVAL);
 2270         }
 2271 
 2272         if (wrch != NULL)
 2273                 wrch->flags |= CHN_F_MMAP;
 2274         if (rdch != NULL)
 2275                 rdch->flags |= CHN_F_MMAP;
 2276 
 2277         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
 2278         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2279         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
 2280             size, nprot, *offset, curthread->td_ucred);
 2281 
 2282         PCM_GIANT_LEAVE(d);
 2283 
 2284         if (*object == NULL)
 2285                  return (EINVAL);
 2286         return (0);
 2287 }
 2288 
 2289 /* So much for dev_stdclone() */
 2290 static int
 2291 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
 2292 {
 2293         size_t len;
 2294 
 2295         len = strlen(namep);
 2296 
 2297         if (bcmp(name, namep, len) != 0)
 2298                 return (ENODEV);
 2299 
 2300         name += len;
 2301 
 2302         if (isdigit(*name) == 0)
 2303                 return (ENODEV);
 2304 
 2305         len = strlen(sep);
 2306 
 2307         if (*name == '' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
 2308                 return (ENODEV);
 2309 
 2310         for (*u = 0; isdigit(*name) != 0; name++) {
 2311                 *u *= 10;
 2312                 *u += *name - '';
 2313                 if (*u > dsp_umax)
 2314                         return (ENODEV);
 2315         }
 2316 
 2317         if (*name == '\0')
 2318                 return ((use_sep == 0) ? 0 : ENODEV);
 2319 
 2320         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
 2321                 return (ENODEV);
 2322 
 2323         name += len;
 2324 
 2325         if (*name == '' && name[1] != '\0')
 2326                 return (ENODEV);
 2327 
 2328         for (*c = 0; isdigit(*name) != 0; name++) {
 2329                 *c *= 10;
 2330                 *c += *name - '';
 2331                 if (*c > dsp_cmax)
 2332                         return (ENODEV);
 2333         }
 2334 
 2335         if (*name != '\0')
 2336                 return (ENODEV);
 2337 
 2338         return (0);
 2339 }
 2340 
 2341 static void
 2342 dsp_clone(void *arg,
 2343     struct ucred *cred,
 2344     char *name, int namelen, struct cdev **dev)
 2345 {
 2346         struct snddev_info *d;
 2347         struct snd_clone_entry *ce;
 2348         struct pcm_channel *c;
 2349         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
 2350         char *devname, *devcmp, *devsep;
 2351 
 2352         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
 2353 
 2354         if (*dev != NULL)
 2355                 return;
 2356 
 2357         unit = -1;
 2358         cunit = -1;
 2359         devtype = -1;
 2360         devhw = 0;
 2361         devcmax = -1;
 2362         tumax = -1;
 2363         devname = NULL;
 2364         devsep = NULL;
 2365 
 2366         for (i = 0; unit == -1 &&
 2367             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2368                 devtype = dsp_cdevs[i].type;
 2369                 devcmp = dsp_cdevs[i].name;
 2370                 devsep = dsp_cdevs[i].sep;
 2371                 devname = dsp_cdevs[i].alias;
 2372                 if (devname == NULL)
 2373                         devname = devcmp;
 2374                 devhw = dsp_cdevs[i].hw;
 2375                 devcmax = dsp_cdevs[i].max - 1;
 2376                 if (strcmp(name, devcmp) == 0) {
 2377                         if (dsp_basename_clone != 0)
 2378                                 unit = snd_unit;
 2379                 } else if (dsp_stdclone(name, devcmp, devsep,
 2380                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
 2381                         unit = -1;
 2382                         cunit = -1;
 2383                 }
 2384         }
 2385 
 2386         d = devclass_get_softc(pcm_devclass, unit);
 2387         if (!PCM_REGISTERED(d) || d->clones == NULL)
 2388                 return;
 2389 
 2390         /* XXX Need Giant magic entry ??? */
 2391 
 2392         PCM_LOCK(d);
 2393         if (snd_clone_disabled(d->clones)) {
 2394                 PCM_UNLOCK(d);
 2395                 return;
 2396         }
 2397 
 2398         PCM_WAIT(d);
 2399         PCM_ACQUIRE(d);
 2400         PCM_UNLOCK(d);
 2401 
 2402         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
 2403 
 2404         if (devhw != 0) {
 2405                 KASSERT(devcmax <= dsp_cmax,
 2406                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
 2407                 if (cunit > devcmax) {
 2408                         PCM_RELEASE_QUICK(d);
 2409                         return;
 2410                 }
 2411                 udcmask |= snd_c2unit(cunit);
 2412                 CHN_FOREACH(c, d, channels.pcm) {
 2413                         CHN_LOCK(c);
 2414                         if (c->unit != udcmask) {
 2415                                 CHN_UNLOCK(c);
 2416                                 continue;
 2417                         }
 2418                         CHN_UNLOCK(c);
 2419                         udcmask &= ~snd_c2unit(cunit);
 2420                         /*
 2421                          * Temporarily increase clone maxunit to overcome
 2422                          * vchan flexibility.
 2423                          *
 2424                          * # sysctl dev.pcm.0.play.vchans=256
 2425                          * dev.pcm.0.play.vchans: 1 -> 256
 2426                          * # cat /dev/zero > /dev/dsp0.vp255 &
 2427                          * [1] 17296
 2428                          * # sysctl dev.pcm.0.play.vchans=0
 2429                          * dev.pcm.0.play.vchans: 256 -> 1
 2430                          * # fg
 2431                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
 2432                          * ^C
 2433                          * # cat /dev/zero > /dev/dsp0.vp255
 2434                          * zsh: operation not supported: /dev/dsp0.vp255
 2435                          */
 2436                         tumax = snd_clone_getmaxunit(d->clones);
 2437                         if (cunit > tumax)
 2438                                 snd_clone_setmaxunit(d->clones, cunit);
 2439                         else
 2440                                 tumax = -1;
 2441                         goto dsp_clone_alloc;
 2442                 }
 2443                 /*
 2444                  * Ok, so we're requesting unallocated vchan, but still
 2445                  * within maximum vchan limit.
 2446                  */
 2447                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
 2448                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
 2449                     cunit < snd_maxautovchans) {
 2450                         udcmask &= ~snd_c2unit(cunit);
 2451                         tumax = snd_clone_getmaxunit(d->clones);
 2452                         if (cunit > tumax)
 2453                                 snd_clone_setmaxunit(d->clones, cunit);
 2454                         else
 2455                                 tumax = -1;
 2456                         goto dsp_clone_alloc;
 2457                 }
 2458                 PCM_RELEASE_QUICK(d);
 2459                 return;
 2460         }
 2461 
 2462 dsp_clone_alloc:
 2463         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
 2464         if (tumax != -1)
 2465                 snd_clone_setmaxunit(d->clones, tumax);
 2466         if (ce != NULL) {
 2467                 udcmask |= snd_c2unit(cunit);
 2468                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
 2469                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
 2470                     devname, unit, devsep, cunit);
 2471                 snd_clone_register(ce, *dev);
 2472         }
 2473 
 2474         PCM_RELEASE_QUICK(d);
 2475 
 2476         if (*dev != NULL)
 2477                 dev_ref(*dev);
 2478 }
 2479 
 2480 static void
 2481 dsp_sysinit(void *p)
 2482 {
 2483         if (dsp_ehtag != NULL)
 2484                 return;
 2485         /* initialize unit numbering */
 2486         snd_unit_init();
 2487         dsp_umax = PCMMAXUNIT;
 2488         dsp_cmax = PCMMAXCHAN;
 2489         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
 2490 }
 2491 
 2492 static void
 2493 dsp_sysuninit(void *p)
 2494 {
 2495         if (dsp_ehtag == NULL)
 2496                 return;
 2497         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
 2498         dsp_ehtag = NULL;
 2499 }
 2500 
 2501 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
 2502 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
 2503 
 2504 char *
 2505 dsp_unit2name(char *buf, size_t len, int unit)
 2506 {
 2507         int i, dtype;
 2508 
 2509         KASSERT(buf != NULL && len != 0,
 2510             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
 2511 
 2512         dtype = snd_unit2d(unit);
 2513 
 2514         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2515                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 2516                         continue;
 2517                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
 2518                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
 2519                 return (buf);
 2520         }
 2521 
 2522         return (NULL);
 2523 }
 2524 
 2525 /**
 2526  * @brief Handler for SNDCTL_AUDIOINFO.
 2527  *
 2528  * Gathers information about the audio device specified in ai->dev.  If
 2529  * ai->dev == -1, then this function gathers information about the current
 2530  * device.  If the call comes in on a non-audio device and ai->dev == -1,
 2531  * return EINVAL.
 2532  *
 2533  * This routine is supposed to go practically straight to the hardware,
 2534  * getting capabilities directly from the sound card driver, side-stepping
 2535  * the intermediate channel interface.
 2536  *
 2537  * Note, however, that the usefulness of this command is significantly
 2538  * decreased when requesting info about any device other than the one serving
 2539  * the request. While each snddev_channel refers to a specific device node,
 2540  * the converse is *not* true.  Currently, when a sound device node is opened,
 2541  * the sound subsystem scans for an available audio channel (or channels, if
 2542  * opened in read+write) and then assigns them to the si_drv[12] private
 2543  * data fields.  As a result, any information returned linking a channel to
 2544  * a specific character device isn't necessarily accurate.
 2545  *
 2546  * @note
 2547  * Calling threads must not hold any snddev_info or pcm_channel locks.
 2548  * 
 2549  * @param dev           device on which the ioctl was issued
 2550  * @param ai            ioctl request data container
 2551  *
 2552  * @retval 0            success
 2553  * @retval EINVAL       ai->dev specifies an invalid device
 2554  *
 2555  * @todo Verify correctness of Doxygen tags.  ;)
 2556  */
 2557 int
 2558 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
 2559 {
 2560         struct pcmchan_caps *caps;
 2561         struct pcm_channel *ch;
 2562         struct snddev_info *d;
 2563         uint32_t fmts;
 2564         int i, nchan, *rates, minch, maxch;
 2565         char *devname, buf[CHN_NAMELEN];
 2566 
 2567         /*
 2568          * If probing the device that received the ioctl, make sure it's a
 2569          * DSP device.  (Users may use this ioctl with /dev/mixer and
 2570          * /dev/midi.)
 2571          */
 2572         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
 2573                 return (EINVAL);
 2574 
 2575         ch = NULL;
 2576         devname = NULL;
 2577         nchan = 0;
 2578         bzero(buf, sizeof(buf));
 2579 
 2580         /*
 2581          * Search for the requested audio device (channel).  Start by
 2582          * iterating over pcm devices.
 2583          */ 
 2584         for (i = 0; pcm_devclass != NULL &&
 2585             i < devclass_get_maxunit(pcm_devclass); i++) {
 2586                 d = devclass_get_softc(pcm_devclass, i);
 2587                 if (!PCM_REGISTERED(d))
 2588                         continue;
 2589 
 2590                 /* XXX Need Giant magic entry ??? */
 2591 
 2592                 /* See the note in function docblock */
 2593                 PCM_UNLOCKASSERT(d);
 2594                 PCM_LOCK(d);
 2595 
 2596                 CHN_FOREACH(ch, d, channels.pcm) {
 2597                         CHN_UNLOCKASSERT(ch);
 2598                         CHN_LOCK(ch);
 2599                         if (ai->dev == -1) {
 2600                                 if (DSP_REGISTERED(d, i_dev) &&
 2601                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
 2602                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
 2603                                         devname = dsp_unit2name(buf,
 2604                                             sizeof(buf), ch->unit);
 2605                                 }
 2606                         } else if (ai->dev == nchan) {
 2607                                 devname = dsp_unit2name(buf, sizeof(buf),
 2608                                     ch->unit);
 2609                         }
 2610                         if (devname != NULL)
 2611                                 break;
 2612                         CHN_UNLOCK(ch);
 2613                         ++nchan;
 2614                 }
 2615 
 2616                 if (devname != NULL) {
 2617                         /*
 2618                          * At this point, the following synchronization stuff
 2619                          * has happened:
 2620                          * - a specific PCM device is locked.
 2621                          * - a specific audio channel has been locked, so be
 2622                          *   sure to unlock when exiting;
 2623                          */
 2624 
 2625                         caps = chn_getcaps(ch);
 2626 
 2627                         /*
 2628                          * With all handles collected, zero out the user's
 2629                          * container and begin filling in its fields.
 2630                          */
 2631                         bzero((void *)ai, sizeof(oss_audioinfo));
 2632 
 2633                         ai->dev = nchan;
 2634                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
 2635 
 2636                         if ((ch->flags & CHN_F_BUSY) == 0)
 2637                                 ai->busy = 0;
 2638                         else
 2639                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
 2640 
 2641                         /**
 2642                          * @note
 2643                          * @c cmd - OSSv4 docs: "Only supported under Linux at
 2644                          *    this moment." Cop-out, I know, but I'll save
 2645                          *    running around in the process table for later.
 2646                          *    Is there a risk of leaking information?
 2647                          */
 2648                         ai->pid = ch->pid;
 2649 
 2650                         /*
 2651                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
 2652                          * Note, however, that a single channel operates in
 2653                          * only one direction, so PCM_CAP_DUPLEX is out.
 2654                          */
 2655                         /**
 2656                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
 2657                          *       these in pcmchan::caps?
 2658                          */
 2659                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
 2660                             ((ch->flags & CHN_F_VIRTUAL) ? PCM_CAP_VIRTUAL : 0) |
 2661                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
 2662 
 2663                         /*
 2664                          * Collect formats supported @b natively by the
 2665                          * device.  Also determine min/max channels.  (I.e.,
 2666                          * mono, stereo, or both?)
 2667                          *
 2668                          * If any channel is stereo, maxch = 2;
 2669                          * if all channels are stereo, minch = 2, too;
 2670                          * if any channel is mono, minch = 1;
 2671                          * and if all channels are mono, maxch = 1.
 2672                          */
 2673                         minch = 0;
 2674                         maxch = 0;
 2675                         fmts = 0;
 2676                         for (i = 0; caps->fmtlist[i]; i++) {
 2677                                 fmts |= caps->fmtlist[i];
 2678                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
 2679                                         minch = (minch == 0) ? 2 : minch;
 2680                                         maxch = 2;
 2681                                 } else {
 2682                                         minch = 1;
 2683                                         maxch = (maxch == 0) ? 1 : maxch;
 2684                                 }
 2685                         }
 2686 
 2687                         if (ch->direction == PCMDIR_PLAY)
 2688                                 ai->oformats = fmts;
 2689                         else
 2690                                 ai->iformats = fmts;
 2691 
 2692                         /**
 2693                          * @note
 2694                          * @c magic - OSSv4 docs: "Reserved for internal use
 2695                          *    by OSS."
 2696                          *
 2697                          * @par
 2698                          * @c card_number - OSSv4 docs: "Number of the sound
 2699                          *    card where this device belongs or -1 if this
 2700                          *    information is not available.  Applications
 2701                          *    should normally not use this field for any
 2702                          *    purpose."
 2703                          */
 2704                         ai->card_number = -1;
 2705                         /**
 2706                          * @todo @c song_name - depends first on
 2707                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
 2708                          *          on SNDCTL_[GS]ETLABEL
 2709                          * @todo @c port_number - routing information?
 2710                          */
 2711                         ai->port_number = -1;
 2712                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
 2713                         /**
 2714                          * @note
 2715                          * @c real_device - OSSv4 docs:  "Obsolete."
 2716                          */
 2717                         ai->real_device = -1;
 2718                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
 2719                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
 2720                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
 2721                         /**
 2722                          * @note
 2723                          * @c flags - OSSv4 docs: "Reserved for future use."
 2724                          *
 2725                          * @note
 2726                          * @c binding - OSSv4 docs: "Reserved for future use."
 2727                          *
 2728                          * @todo @c handle - haven't decided how to generate
 2729                          *       this yet; bus, vendor, device IDs?
 2730                          */
 2731                         ai->min_rate = caps->minspeed;
 2732                         ai->max_rate = caps->maxspeed;
 2733 
 2734                         ai->min_channels = minch;
 2735                         ai->max_channels = maxch;
 2736 
 2737                         ai->nrates = chn_getrates(ch, &rates);
 2738                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
 2739                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
 2740 
 2741                         for (i = 0; i < ai->nrates; i++)
 2742                                 ai->rates[i] = rates[i];
 2743                         
 2744                         ai->next_play_engine = 0;
 2745                         ai->next_rec_engine = 0;
 2746 
 2747                         CHN_UNLOCK(ch);
 2748                 }
 2749 
 2750                 PCM_UNLOCK(d);
 2751 
 2752                 if (devname != NULL)
 2753                         return (0);
 2754         }
 2755 
 2756         /* Exhausted the search -- nothing is locked, so return. */
 2757         return (EINVAL);
 2758 }
 2759 
 2760 /**
 2761  * @brief Assigns a PCM channel to a sync group.
 2762  *
 2763  * Sync groups are used to enable audio operations on multiple devices
 2764  * simultaneously.  They may be used with any number of devices and may
 2765  * span across applications.  Devices are added to groups with
 2766  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
 2767  * SNDCTL_DSP_SYNCSTART ioctl.
 2768  *
 2769  * If the @c id field of the @c group parameter is set to zero, then a new
 2770  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
 2771  * the group specified.
 2772  *
 2773  * @todo As far as memory allocation, should we assume that things are
 2774  *       okay and allocate with M_WAITOK before acquiring channel locks,
 2775  *       freeing later if not?
 2776  *
 2777  * @param wrch  output channel associated w/ device (if any)
 2778  * @param rdch  input channel associated w/ device (if any)
 2779  * @param group Sync group parameters
 2780  *
 2781  * @retval 0            success
 2782  * @retval non-zero     error to be propagated upstream
 2783  */
 2784 static int
 2785 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
 2786 {
 2787         struct pcmchan_syncmember *smrd, *smwr;
 2788         struct pcmchan_syncgroup *sg;
 2789         int ret, sg_ids[3];
 2790 
 2791         smrd = NULL;
 2792         smwr = NULL;
 2793         sg = NULL;
 2794         ret = 0;
 2795 
 2796         /*
 2797          * Free_unr() may sleep, so store released syncgroup IDs until after
 2798          * all locks are released.
 2799          */
 2800         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
 2801 
 2802         PCM_SG_LOCK();
 2803 
 2804         /*
 2805          * - Insert channel(s) into group's member list.
 2806          * - Set CHN_F_NOTRIGGER on channel(s).
 2807          * - Stop channel(s).  
 2808          */
 2809 
 2810         /*
 2811          * If device's channels are already mapped to a group, unmap them.
 2812          */
 2813         if (wrch) {
 2814                 CHN_LOCK(wrch);
 2815                 sg_ids[0] = chn_syncdestroy(wrch);
 2816         }
 2817 
 2818         if (rdch) {
 2819                 CHN_LOCK(rdch);
 2820                 sg_ids[1] = chn_syncdestroy(rdch);
 2821         }
 2822 
 2823         /*
 2824          * Verify that mode matches character device properites.
 2825          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
 2826          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
 2827          */
 2828         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
 2829             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
 2830                 ret = EINVAL;
 2831                 goto out;
 2832         }
 2833 
 2834         /*
 2835          * An id of zero indicates the user wants to create a new
 2836          * syncgroup.
 2837          */
 2838         if (group->id == 0) {
 2839                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 2840                 if (sg != NULL) {
 2841                         SLIST_INIT(&sg->members);
 2842                         sg->id = alloc_unr(pcmsg_unrhdr);
 2843 
 2844                         group->id = sg->id;
 2845                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
 2846                 } else
 2847                         ret = ENOMEM;
 2848         } else {
 2849                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2850                         if (sg->id == group->id)
 2851                                 break;
 2852                 }
 2853                 if (sg == NULL)
 2854                         ret = EINVAL;
 2855         }
 2856 
 2857         /* Couldn't create or find a syncgroup.  Fail. */
 2858         if (sg == NULL)
 2859                 goto out;
 2860 
 2861         /*
 2862          * Allocate a syncmember, assign it and a channel together, and
 2863          * insert into syncgroup.
 2864          */
 2865         if (group->mode & PCM_ENABLE_INPUT) {
 2866                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 2867                 if (smrd == NULL) {
 2868                         ret = ENOMEM;
 2869                         goto out;
 2870                 }
 2871 
 2872                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
 2873                 smrd->parent = sg;
 2874                 smrd->ch = rdch;
 2875 
 2876                 chn_abort(rdch);
 2877                 rdch->flags |= CHN_F_NOTRIGGER;
 2878                 rdch->sm = smrd;
 2879         }
 2880 
 2881         if (group->mode & PCM_ENABLE_OUTPUT) {
 2882                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 2883                 if (smwr == NULL) {
 2884                         ret = ENOMEM;
 2885                         goto out;
 2886                 }
 2887 
 2888                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
 2889                 smwr->parent = sg;
 2890                 smwr->ch = wrch;
 2891 
 2892                 chn_abort(wrch);
 2893                 wrch->flags |= CHN_F_NOTRIGGER;
 2894                 wrch->sm = smwr;
 2895         }
 2896 
 2897 
 2898 out:
 2899         if (ret != 0) {
 2900                 if (smrd != NULL)
 2901                         free(smrd, M_DEVBUF);
 2902                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
 2903                         sg_ids[2] = sg->id;
 2904                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2905                         free(sg, M_DEVBUF);
 2906                 }
 2907 
 2908                 if (wrch)
 2909                         wrch->sm = NULL;
 2910                 if (rdch)
 2911                         rdch->sm = NULL;
 2912         }
 2913 
 2914         if (wrch)
 2915                 CHN_UNLOCK(wrch);
 2916         if (rdch)
 2917                 CHN_UNLOCK(rdch);
 2918 
 2919         PCM_SG_UNLOCK();
 2920 
 2921         if (sg_ids[0])
 2922                 free_unr(pcmsg_unrhdr, sg_ids[0]);
 2923         if (sg_ids[1])
 2924                 free_unr(pcmsg_unrhdr, sg_ids[1]);
 2925         if (sg_ids[2])
 2926                 free_unr(pcmsg_unrhdr, sg_ids[2]);
 2927 
 2928         return (ret);
 2929 }
 2930 
 2931 /**
 2932  * @brief Launch a sync group into action
 2933  *
 2934  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
 2935  * iterates over all members, triggering them along the way.
 2936  *
 2937  * @note Caller must not hold any channel locks.
 2938  *
 2939  * @param sg_id sync group identifier
 2940  *
 2941  * @retval 0    success
 2942  * @retval non-zero     error worthy of propagating upstream to user
 2943  */
 2944 static int
 2945 dsp_oss_syncstart(int sg_id)
 2946 {
 2947         struct pcmchan_syncmember *sm, *sm_tmp;
 2948         struct pcmchan_syncgroup *sg;
 2949         struct pcm_channel *c;
 2950         int ret, needlocks;
 2951 
 2952         /* Get the synclists lock */
 2953         PCM_SG_LOCK();
 2954 
 2955         do {
 2956                 ret = 0;
 2957                 needlocks = 0;
 2958 
 2959                 /* Search for syncgroup by ID */
 2960                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2961                         if (sg->id == sg_id)
 2962                                 break;
 2963                 }
 2964 
 2965                 /* Return EINVAL if not found */
 2966                 if (sg == NULL) {
 2967                         ret = EINVAL;
 2968                         break;
 2969                 }
 2970 
 2971                 /* Any removals resulting in an empty group should've handled this */
 2972                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
 2973 
 2974                 /*
 2975                  * Attempt to lock all member channels - if any are already
 2976                  * locked, unlock those acquired, sleep for a bit, and try
 2977                  * again.
 2978                  */
 2979                 SLIST_FOREACH(sm, &sg->members, link) {
 2980                         if (CHN_TRYLOCK(sm->ch) == 0) {
 2981                                 int timo = hz * 5/1000; 
 2982                                 if (timo < 1)
 2983                                         timo = 1;
 2984 
 2985                                 /* Release all locked channels so far, retry */
 2986                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
 2987                                         /* sm is the member already locked */
 2988                                         if (sm == sm_tmp)
 2989                                                 break;
 2990                                         CHN_UNLOCK(sm_tmp->ch);
 2991                                 }
 2992 
 2993                                 /** @todo Is PRIBIO correct/ */
 2994                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
 2995                                     PRIBIO | PCATCH, "pcmsg", timo);
 2996                                 if (ret == EINTR || ret == ERESTART)
 2997                                         break;
 2998 
 2999                                 needlocks = 1;
 3000                                 ret = 0; /* Assumes ret == EAGAIN... */
 3001                         }
 3002                 }
 3003         } while (needlocks && ret == 0);
 3004 
 3005         /* Proceed only if no errors encountered. */
 3006         if (ret == 0) {
 3007                 /* Launch channels */
 3008                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
 3009                         SLIST_REMOVE_HEAD(&sg->members, link);
 3010 
 3011                         c = sm->ch;
 3012                         c->sm = NULL;
 3013                         chn_start(c, 1);
 3014                         c->flags &= ~CHN_F_NOTRIGGER;
 3015                         CHN_UNLOCK(c);
 3016 
 3017                         free(sm, M_DEVBUF);
 3018                 }
 3019 
 3020                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 3021                 free(sg, M_DEVBUF);
 3022         }
 3023 
 3024         PCM_SG_UNLOCK();
 3025 
 3026         /*
 3027          * Free_unr() may sleep, so be sure to give up the syncgroup lock
 3028          * first.
 3029          */
 3030         if (ret == 0)
 3031                 free_unr(pcmsg_unrhdr, sg_id);
 3032 
 3033         return (ret);
 3034 }
 3035 
 3036 /**
 3037  * @brief Handler for SNDCTL_DSP_POLICY
 3038  *
 3039  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
 3040  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
 3041  * specifying those two parameters, s/he simply selects a number from 0..10
 3042  * which corresponds to a buffer size.  Smaller numbers request smaller
 3043  * buffers with lower latencies (at greater overhead from more frequent
 3044  * interrupts), while greater numbers behave in the opposite manner.
 3045  *
 3046  * The 4Front spec states that a value of 5 should be the default.  However,
 3047  * this implementation deviates slightly by using a linear scale without
 3048  * consulting drivers.  I.e., even though drivers may have different default
 3049  * buffer sizes, a policy argument of 5 will have the same result across
 3050  * all drivers.
 3051  *
 3052  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
 3053  * more information.
 3054  *
 3055  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
 3056  *       work with hardware drivers directly.
 3057  *
 3058  * @note PCM channel arguments must not be locked by caller.
 3059  *
 3060  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
 3061  * @param rdch  " recording channel (optional; may be NULL)
 3062  * @param policy Integer from [0:10]
 3063  *
 3064  * @retval 0    constant (for now)
 3065  */
 3066 static int
 3067 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
 3068 {
 3069         int ret;
 3070 
 3071         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
 3072                 return (EIO);
 3073 
 3074         /* Default: success */
 3075         ret = 0;
 3076 
 3077         if (rdch) {
 3078                 CHN_LOCK(rdch);
 3079                 ret = chn_setlatency(rdch, policy);
 3080                 CHN_UNLOCK(rdch);
 3081         }
 3082 
 3083         if (wrch && ret == 0) {
 3084                 CHN_LOCK(wrch);
 3085                 ret = chn_setlatency(wrch, policy);
 3086                 CHN_UNLOCK(wrch);
 3087         }
 3088 
 3089         if (ret)
 3090                 ret = EIO;
 3091 
 3092         return (ret);
 3093 }
 3094 
 3095 /**
 3096  * @brief Enable or disable "cooked" mode
 3097  *
 3098  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
 3099  * is the default, the sound system handles rate and format conversions
 3100  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
 3101  * operates with 44100Hz/16bit/signed samples).
 3102  *
 3103  * Disabling cooked mode is intended for applications wanting to mmap()
 3104  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
 3105  * feeder architecture, presumably to gain as much control over audio
 3106  * hardware as possible.
 3107  *
 3108  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
 3109  * for more details.
 3110  *
 3111  * @param wrch          playback channel (optional; may be NULL)
 3112  * @param rdch          recording channel (optional; may be NULL)
 3113  * @param enabled       0 = raw mode, 1 = cooked mode
 3114  *
 3115  * @retval EINVAL       Operation not yet supported.
 3116  */
 3117 static int
 3118 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
 3119 {
 3120 
 3121         /*
 3122          * XXX I just don't get it. Why don't they call it
 3123          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
 3124          * This is just plain so confusing, incoherent,
 3125          * <insert any non-printable characters here>.
 3126          */
 3127         if (!(enabled == 1 || enabled == 0))
 3128                 return (EINVAL);
 3129 
 3130         /*
 3131          * I won't give in. I'm inverting its logic here and now.
 3132          * Brag all you want, but "BITPERFECT" should be the better
 3133          * term here.
 3134          */
 3135         enabled ^= 0x00000001;
 3136 
 3137         if (wrch != NULL) {
 3138                 CHN_LOCK(wrch);
 3139                 wrch->flags &= ~CHN_F_BITPERFECT;
 3140                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3141                 CHN_UNLOCK(wrch);
 3142         }
 3143 
 3144         if (rdch != NULL) {
 3145                 CHN_LOCK(rdch);
 3146                 rdch->flags &= ~CHN_F_BITPERFECT;
 3147                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3148                 CHN_UNLOCK(rdch);
 3149         }
 3150 
 3151         return (0);
 3152 }
 3153 
 3154 /**
 3155  * @brief Retrieve channel interleaving order
 3156  *
 3157  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
 3158  *
 3159  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
 3160  * for more details.
 3161  *
 3162  * @note As the ioctl definition is still under construction, FreeBSD
 3163  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
 3164  *
 3165  * @param wrch  playback channel (optional; may be NULL)
 3166  * @param rdch  recording channel (optional; may be NULL)
 3167  * @param map   channel map (result will be stored there)
 3168  *
 3169  * @retval EINVAL       Operation not yet supported.
 3170  */
 3171 static int
 3172 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3173 {
 3174         struct pcm_channel *ch;
 3175         int ret;
 3176 
 3177         ch = (wrch != NULL) ? wrch : rdch;
 3178         if (ch != NULL) {
 3179                 CHN_LOCK(ch);
 3180                 ret = chn_oss_getorder(ch, map);
 3181                 CHN_UNLOCK(ch);
 3182         } else
 3183                 ret = EINVAL;
 3184 
 3185         return (ret);
 3186 }
 3187 
 3188 /**
 3189  * @brief Specify channel interleaving order
 3190  *
 3191  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
 3192  *
 3193  * @note As the ioctl definition is still under construction, FreeBSD
 3194  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
 3195  *
 3196  * @param wrch  playback channel (optional; may be NULL)
 3197  * @param rdch  recording channel (optional; may be NULL)
 3198  * @param map   channel map
 3199  *
 3200  * @retval EINVAL       Operation not yet supported.
 3201  */
 3202 static int
 3203 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3204 {
 3205         int ret;
 3206 
 3207         ret = 0;
 3208 
 3209         if (wrch != NULL) {
 3210                 CHN_LOCK(wrch);
 3211                 ret = chn_oss_setorder(wrch, map);
 3212                 CHN_UNLOCK(wrch);
 3213         }
 3214 
 3215         if (ret == 0 && rdch != NULL) {
 3216                 CHN_LOCK(rdch);
 3217                 ret = chn_oss_setorder(rdch, map);
 3218                 CHN_UNLOCK(rdch);
 3219         }
 3220 
 3221         return (ret);
 3222 }
 3223 
 3224 static int
 3225 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
 3226     int *mask)
 3227 {
 3228         struct pcm_channel *ch;
 3229         uint32_t chnmask;
 3230         int ret;
 3231 
 3232         chnmask = 0;
 3233         ch = (wrch != NULL) ? wrch : rdch;
 3234 
 3235         if (ch != NULL) {
 3236                 CHN_LOCK(ch);
 3237                 ret = chn_oss_getmask(ch, &chnmask);
 3238                 CHN_UNLOCK(ch);
 3239         } else
 3240                 ret = EINVAL;
 3241 
 3242         if (ret == 0)
 3243                 *mask = chnmask;
 3244 
 3245         return (ret);
 3246 }
 3247 
 3248 #ifdef OSSV4_EXPERIMENT
 3249 /**
 3250  * @brief Retrieve an audio device's label
 3251  *
 3252  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
 3253  *
 3254  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3255  * for more details.
 3256  *
 3257  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
 3258  * consoles) can show variable "labels" for certain controls. By default
 3259  * the application name (say quake) is shown as the label but
 3260  * applications may change the labels themselves."
 3261  *
 3262  * @note As the ioctl definition is still under construction, FreeBSD
 3263  *       does not currently support @c SNDCTL_GETLABEL.
 3264  *
 3265  * @param wrch  playback channel (optional; may be NULL)
 3266  * @param rdch  recording channel (optional; may be NULL)
 3267  * @param label label gets copied here
 3268  *
 3269  * @retval EINVAL       Operation not yet supported.
 3270  */
 3271 static int
 3272 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3273 {
 3274         return (EINVAL);
 3275 }
 3276 
 3277 /**
 3278  * @brief Specify an audio device's label
 3279  *
 3280  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
 3281  * comments for @c dsp_oss_getlabel immediately above.
 3282  *
 3283  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3284  * for more details.
 3285  *
 3286  * @note As the ioctl definition is still under construction, FreeBSD
 3287  *       does not currently support SNDCTL_SETLABEL.
 3288  *
 3289  * @param wrch  playback channel (optional; may be NULL)
 3290  * @param rdch  recording channel (optional; may be NULL)
 3291  * @param label label gets copied from here
 3292  *
 3293  * @retval EINVAL       Operation not yet supported.
 3294  */
 3295 static int
 3296 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3297 {
 3298         return (EINVAL);
 3299 }
 3300 
 3301 /**
 3302  * @brief Retrieve name of currently played song
 3303  *
 3304  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
 3305  * tell the system the name of the currently playing song, which would be
 3306  * visible in @c /dev/sndstat.
 3307  *
 3308  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
 3309  * for more details.
 3310  *
 3311  * @note As the ioctl definition is still under construction, FreeBSD
 3312  *       does not currently support SNDCTL_GETSONG.
 3313  *
 3314  * @param wrch  playback channel (optional; may be NULL)
 3315  * @param rdch  recording channel (optional; may be NULL)
 3316  * @param song  song name gets copied here
 3317  *
 3318  * @retval EINVAL       Operation not yet supported.
 3319  */
 3320 static int
 3321 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3322 {
 3323         return (EINVAL);
 3324 }
 3325 
 3326 /**
 3327  * @brief Retrieve name of currently played song
 3328  *
 3329  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
 3330  * tell the system the name of the currently playing song, which would be
 3331  * visible in @c /dev/sndstat.
 3332  *
 3333  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
 3334  * for more details.
 3335  *
 3336  * @note As the ioctl definition is still under construction, FreeBSD
 3337  *       does not currently support SNDCTL_SETSONG.
 3338  *
 3339  * @param wrch  playback channel (optional; may be NULL)
 3340  * @param rdch  recording channel (optional; may be NULL)
 3341  * @param song  song name gets copied from here
 3342  *
 3343  * @retval EINVAL       Operation not yet supported.
 3344  */
 3345 static int
 3346 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3347 {
 3348         return (EINVAL);
 3349 }
 3350 
 3351 /**
 3352  * @brief Rename a device
 3353  *
 3354  * This is a handler for the @c SNDCTL_SETNAME ioctl.
 3355  *
 3356  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
 3357  * more details.
 3358  *
 3359  * From Hannu@4Front:  "This call is used to change the device name
 3360  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
 3361  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
 3362  * name depending on the current context (for example 'OSS virtual wave table
 3363  * synth' or 'VoIP link to London')."
 3364  *
 3365  * @note As the ioctl definition is still under construction, FreeBSD
 3366  *       does not currently support SNDCTL_SETNAME.
 3367  *
 3368  * @param wrch  playback channel (optional; may be NULL)
 3369  * @param rdch  recording channel (optional; may be NULL)
 3370  * @param name  new device name gets copied from here
 3371  *
 3372  * @retval EINVAL       Operation not yet supported.
 3373  */
 3374 static int
 3375 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
 3376 {
 3377         return (EINVAL);
 3378 }
 3379 #endif  /* !OSSV4_EXPERIMENT */

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