The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
    4  * Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifdef HAVE_KERNEL_OPTION_HEADERS
   30 #include "opt_snd.h"
   31 #endif
   32 
   33 #include <dev/sound/pcm/sound.h>
   34 #include <sys/ctype.h>
   35 #include <sys/lock.h>
   36 #include <sys/rwlock.h>
   37 #include <sys/sysent.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/vm_object.h>
   41 #include <vm/vm_page.h>
   42 #include <vm/vm_pager.h>
   43 
   44 SND_DECLARE_FILE("$FreeBSD: stable/10/sys/dev/sound/pcm/dsp.c 358879 2020-03-11 08:26:11Z hselasky $");
   45 
   46 static int dsp_mmap_allow_prot_exec = 0;
   47 SYSCTL_INT(_hw_snd, OID_AUTO, compat_linux_mmap, CTLFLAG_RW,
   48     &dsp_mmap_allow_prot_exec, 0,
   49     "linux mmap compatibility (-1=force disable 0=auto 1=force enable)");
   50 
   51 static int dsp_basename_clone = 1;
   52 SYSCTL_INT(_hw_snd, OID_AUTO, basename_clone, CTLFLAG_RWTUN,
   53     &dsp_basename_clone, 0,
   54     "DSP basename cloning (0: Disable; 1: Enabled)");
   55 TUNABLE_INT("hw.snd.basename_clone", &dsp_basename_clone);
   56 
   57 struct dsp_cdevinfo {
   58         struct pcm_channel *rdch, *wrch;
   59         struct pcm_channel *volch;
   60         int busy, simplex;
   61         TAILQ_ENTRY(dsp_cdevinfo) link;
   62 };
   63 
   64 #define PCM_RDCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->rdch)
   65 #define PCM_WRCH(x)             (((struct dsp_cdevinfo *)(x)->si_drv1)->wrch)
   66 #define PCM_VOLCH(x)            (((struct dsp_cdevinfo *)(x)->si_drv1)->volch)
   67 #define PCM_SIMPLEX(x)          (((struct dsp_cdevinfo *)(x)->si_drv1)->simplex)
   68 
   69 #define DSP_CDEVINFO_CACHESIZE  8
   70 
   71 #define DSP_REGISTERED(x, y)    (PCM_REGISTERED(x) &&                   \
   72                                  (y) != NULL && (y)->si_drv1 != NULL)
   73 
   74 #define OLDPCM_IOCTL
   75 
   76 static d_open_t dsp_open;
   77 static d_close_t dsp_close;
   78 static d_read_t dsp_read;
   79 static d_write_t dsp_write;
   80 static d_ioctl_t dsp_ioctl;
   81 static d_poll_t dsp_poll;
   82 static d_mmap_t dsp_mmap;
   83 static d_mmap_single_t dsp_mmap_single;
   84 
   85 struct cdevsw dsp_cdevsw = {
   86         .d_version =    D_VERSION,
   87         .d_open =       dsp_open,
   88         .d_close =      dsp_close,
   89         .d_read =       dsp_read,
   90         .d_write =      dsp_write,
   91         .d_ioctl =      dsp_ioctl,
   92         .d_poll =       dsp_poll,
   93         .d_mmap =       dsp_mmap,
   94         .d_mmap_single = dsp_mmap_single,
   95         .d_name =       "dsp",
   96 };
   97 
   98 static eventhandler_tag dsp_ehtag = NULL;
   99 static int dsp_umax = -1;
  100 static int dsp_cmax = -1;
  101 
  102 static int dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group);
  103 static int dsp_oss_syncstart(int sg_id);
  104 static int dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy);
  105 static int dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled);
  106 static int dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  107 static int dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map);
  108 static int dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch, int *mask);
  109 #ifdef OSSV4_EXPERIMENT
  110 static int dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  111 static int dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label);
  112 static int dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  113 static int dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song);
  114 static int dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name);
  115 #endif
  116 
  117 static struct snddev_info *
  118 dsp_get_info(struct cdev *dev)
  119 {
  120         return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
  121 }
  122 
  123 static uint32_t
  124 dsp_get_flags(struct cdev *dev)
  125 {
  126         device_t bdev;
  127 
  128         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  129 
  130         return ((bdev != NULL) ? pcm_getflags(bdev) : 0xffffffff);
  131 }
  132 
  133 static void
  134 dsp_set_flags(struct cdev *dev, uint32_t flags)
  135 {
  136         device_t bdev;
  137 
  138         bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
  139 
  140         if (bdev != NULL)
  141                 pcm_setflags(bdev, flags);
  142 }
  143 
  144 /*
  145  * return the channels associated with an open device instance.
  146  * lock channels specified.
  147  */
  148 static int
  149 getchns(struct cdev *dev, struct pcm_channel **rdch, struct pcm_channel **wrch,
  150     uint32_t prio)
  151 {
  152         struct snddev_info *d;
  153         struct pcm_channel *ch;
  154         uint32_t flags;
  155 
  156         if (PCM_SIMPLEX(dev) != 0) {
  157                 d = dsp_get_info(dev);
  158                 if (!PCM_REGISTERED(d))
  159                         return (ENXIO);
  160                 PCM_LOCK(d);
  161                 PCM_WAIT(d);
  162                 PCM_ACQUIRE(d);
  163                 /*
  164                  * Note: order is important -
  165                  *       pcm flags -> prio query flags -> wild guess
  166                  */
  167                 ch = NULL;
  168                 flags = dsp_get_flags(dev);
  169                 if (flags & SD_F_PRIO_WR) {
  170                         ch = PCM_RDCH(dev);
  171                         PCM_RDCH(dev) = NULL;
  172                 } else if (flags & SD_F_PRIO_RD) {
  173                         ch = PCM_WRCH(dev);
  174                         PCM_WRCH(dev) = NULL;
  175                 } else if (prio & SD_F_PRIO_WR) {
  176                         ch = PCM_RDCH(dev);
  177                         PCM_RDCH(dev) = NULL;
  178                         flags |= SD_F_PRIO_WR;
  179                 } else if (prio & SD_F_PRIO_RD) {
  180                         ch = PCM_WRCH(dev);
  181                         PCM_WRCH(dev) = NULL;
  182                         flags |= SD_F_PRIO_RD;
  183                 } else if (PCM_WRCH(dev) != NULL) {
  184                         ch = PCM_RDCH(dev);
  185                         PCM_RDCH(dev) = NULL;
  186                         flags |= SD_F_PRIO_WR;
  187                 } else if (PCM_RDCH(dev) != NULL) {
  188                         ch = PCM_WRCH(dev);
  189                         PCM_WRCH(dev) = NULL;
  190                         flags |= SD_F_PRIO_RD;
  191                 }
  192                 PCM_SIMPLEX(dev) = 0;
  193                 dsp_set_flags(dev, flags);
  194                 if (ch != NULL) {
  195                         CHN_LOCK(ch);
  196                         pcm_chnref(ch, -1);
  197                         pcm_chnrelease(ch);
  198                 }
  199                 PCM_RELEASE(d);
  200                 PCM_UNLOCK(d);
  201         }
  202 
  203         *rdch = PCM_RDCH(dev);
  204         *wrch = PCM_WRCH(dev);
  205 
  206         if (*rdch != NULL && (prio & SD_F_PRIO_RD))
  207                 CHN_LOCK(*rdch);
  208         if (*wrch != NULL && (prio & SD_F_PRIO_WR))
  209                 CHN_LOCK(*wrch);
  210 
  211         return (0);
  212 }
  213 
  214 /* unlock specified channels */
  215 static void
  216 relchns(struct cdev *dev, struct pcm_channel *rdch, struct pcm_channel *wrch,
  217     uint32_t prio)
  218 {
  219         if (wrch != NULL && (prio & SD_F_PRIO_WR))
  220                 CHN_UNLOCK(wrch);
  221         if (rdch != NULL && (prio & SD_F_PRIO_RD))
  222                 CHN_UNLOCK(rdch);
  223 }
  224 
  225 static void
  226 dsp_cdevinfo_alloc(struct cdev *dev,
  227     struct pcm_channel *rdch, struct pcm_channel *wrch,
  228     struct pcm_channel *volch)
  229 {
  230         struct snddev_info *d;
  231         struct dsp_cdevinfo *cdi;
  232         int simplex;
  233 
  234         d = dsp_get_info(dev);
  235 
  236         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 == NULL &&
  237             ((rdch == NULL && wrch == NULL) || rdch != wrch),
  238             ("bogus %s(), what are you trying to accomplish here?", __func__));
  239         PCM_BUSYASSERT(d);
  240         PCM_LOCKASSERT(d);
  241 
  242         simplex = (dsp_get_flags(dev) & SD_F_SIMPLEX) ? 1 : 0;
  243 
  244         /*
  245          * Scan for free instance entry and put it into the end of list.
  246          * Create new one if necessary.
  247          */
  248         TAILQ_FOREACH(cdi, &d->dsp_cdevinfo_pool, link) {
  249                 if (cdi->busy != 0)
  250                         break;
  251                 cdi->rdch = rdch;
  252                 cdi->wrch = wrch;
  253                 cdi->volch = volch;
  254                 cdi->simplex = simplex;
  255                 cdi->busy = 1;
  256                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  257                 TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  258                 dev->si_drv1 = cdi;
  259                 return;
  260         }
  261         PCM_UNLOCK(d);
  262         cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  263         PCM_LOCK(d);
  264         cdi->rdch = rdch;
  265         cdi->wrch = wrch;
  266         cdi->volch = volch;
  267         cdi->simplex = simplex;
  268         cdi->busy = 1;
  269         TAILQ_INSERT_TAIL(&d->dsp_cdevinfo_pool, cdi, link);
  270         dev->si_drv1 = cdi;
  271 }
  272 
  273 static void
  274 dsp_cdevinfo_free(struct cdev *dev)
  275 {
  276         struct snddev_info *d;
  277         struct dsp_cdevinfo *cdi, *tmp;
  278         uint32_t flags;
  279         int i;
  280 
  281         d = dsp_get_info(dev);
  282 
  283         KASSERT(PCM_REGISTERED(d) && dev != NULL && dev->si_drv1 != NULL &&
  284             PCM_RDCH(dev) == NULL && PCM_WRCH(dev) == NULL &&
  285             PCM_VOLCH(dev) == NULL,
  286             ("bogus %s(), what are you trying to accomplish here?", __func__));
  287         PCM_BUSYASSERT(d);
  288         PCM_LOCKASSERT(d);
  289 
  290         cdi = dev->si_drv1;
  291         dev->si_drv1 = NULL;
  292         cdi->rdch = NULL;
  293         cdi->wrch = NULL;
  294         cdi->volch = NULL;
  295         cdi->simplex = 0;
  296         cdi->busy = 0;
  297 
  298         /*
  299          * Once it is free, move it back to the beginning of list for
  300          * faster new entry allocation.
  301          */
  302         TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  303         TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  304 
  305         /*
  306          * Scan the list, cache free entries up to DSP_CDEVINFO_CACHESIZE.
  307          * Reset simplex flags.
  308          */
  309         flags = dsp_get_flags(dev) & ~SD_F_PRIO_SET;
  310         i = DSP_CDEVINFO_CACHESIZE;
  311         TAILQ_FOREACH_SAFE(cdi, &d->dsp_cdevinfo_pool, link, tmp) {
  312                 if (cdi->busy != 0) {
  313                         if (cdi->simplex == 0) {
  314                                 if (cdi->rdch != NULL)
  315                                         flags |= SD_F_PRIO_RD;
  316                                 if (cdi->wrch != NULL)
  317                                         flags |= SD_F_PRIO_WR;
  318                         }
  319                 } else {
  320                         if (i == 0) {
  321                                 TAILQ_REMOVE(&d->dsp_cdevinfo_pool, cdi, link);
  322                                 free(cdi, M_DEVBUF);
  323                         } else
  324                                 i--;
  325                 }
  326         }
  327         dsp_set_flags(dev, flags);
  328 }
  329 
  330 void
  331 dsp_cdevinfo_init(struct snddev_info *d)
  332 {
  333         struct dsp_cdevinfo *cdi;
  334         int i;
  335 
  336         KASSERT(d != NULL, ("NULL snddev_info"));
  337         PCM_BUSYASSERT(d);
  338         PCM_UNLOCKASSERT(d);
  339 
  340         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  341         for (i = 0; i < DSP_CDEVINFO_CACHESIZE; i++) {
  342                 cdi = malloc(sizeof(*cdi), M_DEVBUF, M_WAITOK | M_ZERO);
  343                 TAILQ_INSERT_HEAD(&d->dsp_cdevinfo_pool, cdi, link);
  344         }
  345 }
  346 
  347 void
  348 dsp_cdevinfo_flush(struct snddev_info *d)
  349 {
  350         struct dsp_cdevinfo *cdi, *tmp;
  351 
  352         KASSERT(d != NULL, ("NULL snddev_info"));
  353         PCM_BUSYASSERT(d);
  354         PCM_UNLOCKASSERT(d);
  355 
  356         cdi = TAILQ_FIRST(&d->dsp_cdevinfo_pool);
  357         while (cdi != NULL) {
  358                 tmp = TAILQ_NEXT(cdi, link);
  359                 free(cdi, M_DEVBUF);
  360                 cdi = tmp;
  361         }
  362         TAILQ_INIT(&d->dsp_cdevinfo_pool);
  363 }
  364 
  365 /* duplex / simplex cdev type */
  366 enum {
  367         DSP_CDEV_TYPE_RDONLY,           /* simplex read-only (record)   */
  368         DSP_CDEV_TYPE_WRONLY,           /* simplex write-only (play)    */
  369         DSP_CDEV_TYPE_RDWR              /* duplex read, write, or both  */
  370 };
  371 
  372 enum {
  373         DSP_CDEV_VOLCTL_NONE,
  374         DSP_CDEV_VOLCTL_READ,
  375         DSP_CDEV_VOLCTL_WRITE
  376 };
  377 
  378 #define DSP_F_VALID(x)          ((x) & (FREAD | FWRITE))
  379 #define DSP_F_DUPLEX(x)         (((x) & (FREAD | FWRITE)) == (FREAD | FWRITE))
  380 #define DSP_F_SIMPLEX(x)        (!DSP_F_DUPLEX(x))
  381 #define DSP_F_READ(x)           ((x) & FREAD)
  382 #define DSP_F_WRITE(x)          ((x) & FWRITE)
  383 
  384 static const struct {
  385         int type;
  386         char *name;
  387         char *sep;
  388         char *alias;
  389         int use_sep;
  390         int hw;
  391         int max;
  392         int volctl;
  393         uint32_t fmt, spd;
  394         int query;
  395 } dsp_cdevs[] = {
  396         { SND_DEV_DSP,         "dsp",    ".", NULL, 0, 0, 0, 0,
  397           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  398           DSP_CDEV_TYPE_RDWR },
  399         { SND_DEV_AUDIO,       "audio",  ".", NULL, 0, 0, 0, 0,
  400           SND_FORMAT(AFMT_MU_LAW, 1, 0), DSP_DEFAULT_SPEED,
  401           DSP_CDEV_TYPE_RDWR },
  402         { SND_DEV_DSP16,       "dspW",   ".", NULL, 0, 0, 0, 0,
  403           SND_FORMAT(AFMT_S16_LE, 1, 0), DSP_DEFAULT_SPEED,
  404           DSP_CDEV_TYPE_RDWR },
  405         { SND_DEV_DSPHW_PLAY,  "dsp",   ".p", NULL, 1, 1, SND_MAXHWCHAN, 1,
  406           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  407         { SND_DEV_DSPHW_VPLAY, "dsp",  ".vp", NULL, 1, 1, SND_MAXVCHANS, 1,
  408           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_WRONLY },
  409         { SND_DEV_DSPHW_REC,   "dsp",   ".r", NULL, 1, 1, SND_MAXHWCHAN, 1,
  410           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  411         { SND_DEV_DSPHW_VREC,  "dsp",  ".vr", NULL, 1, 1, SND_MAXVCHANS, 1,
  412           SND_FORMAT(AFMT_S16_LE, 2, 0), 48000, DSP_CDEV_TYPE_RDONLY },
  413         { SND_DEV_DSPHW_CD,    "dspcd",  ".", NULL, 0, 0, 0, 0,
  414           SND_FORMAT(AFMT_S16_LE, 2, 0), 44100, DSP_CDEV_TYPE_RDWR   },
  415         /* Low priority, OSSv4 aliases. */
  416         { SND_DEV_DSP,      "dsp_ac3",   ".", "dsp", 0, 0, 0, 0,
  417           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  418           DSP_CDEV_TYPE_RDWR },
  419         { SND_DEV_DSP,     "dsp_mmap",   ".", "dsp", 0, 0, 0, 0,
  420           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  421           DSP_CDEV_TYPE_RDWR },
  422         { SND_DEV_DSP,  "dsp_multich",   ".", "dsp", 0, 0, 0, 0,
  423           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  424           DSP_CDEV_TYPE_RDWR },
  425         { SND_DEV_DSP, "dsp_spdifout",   ".", "dsp", 0, 0, 0, 0,
  426           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  427           DSP_CDEV_TYPE_RDWR },
  428         { SND_DEV_DSP,  "dsp_spdifin",   ".", "dsp", 0, 0, 0, 0,
  429           SND_FORMAT(AFMT_U8, 1, 0),     DSP_DEFAULT_SPEED,
  430           DSP_CDEV_TYPE_RDWR },
  431 };
  432 
  433 #define DSP_FIXUP_ERROR()               do {                            \
  434         prio = dsp_get_flags(i_dev);                                    \
  435         if (!DSP_F_VALID(flags))                                        \
  436                 error = EINVAL;                                         \
  437         if (!DSP_F_DUPLEX(flags) &&                                     \
  438             ((DSP_F_READ(flags) && d->reccount == 0) ||                 \
  439             (DSP_F_WRITE(flags) && d->playcount == 0)))                 \
  440                 error = ENOTSUP;                                        \
  441         else if (!DSP_F_DUPLEX(flags) && (prio & SD_F_SIMPLEX) &&       \
  442             ((DSP_F_READ(flags) && (prio & SD_F_PRIO_WR)) ||            \
  443             (DSP_F_WRITE(flags) && (prio & SD_F_PRIO_RD))))             \
  444                 error = EBUSY;                                          \
  445         else if (DSP_REGISTERED(d, i_dev))                              \
  446                 error = EBUSY;                                          \
  447 } while (0)
  448 
  449 static int
  450 dsp_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  451 {
  452         struct pcm_channel *rdch, *wrch;
  453         struct snddev_info *d;
  454         uint32_t fmt, spd, prio, volctl;
  455         int i, error, rderror, wrerror, devtype, wdevunit, rdevunit;
  456 
  457         /* Kind of impossible.. */
  458         if (i_dev == NULL || td == NULL)
  459                 return (ENODEV);
  460 
  461         d = dsp_get_info(i_dev);
  462         if (PCM_DETACHING(d) || !PCM_REGISTERED(d))
  463                 return (EBADF);
  464 
  465         PCM_GIANT_ENTER(d);
  466 
  467         /* Lock snddev so nobody else can monkey with it. */
  468         PCM_LOCK(d);
  469         PCM_WAIT(d);
  470 
  471         /*
  472          * Try to acquire cloned device before someone else pick it.
  473          * ENODEV means this is not a cloned droids.
  474          */
  475         error = snd_clone_acquire(i_dev);
  476         if (!(error == 0 || error == ENODEV)) {
  477                 DSP_FIXUP_ERROR();
  478                 PCM_UNLOCK(d);
  479                 PCM_GIANT_EXIT(d);
  480                 return (error);
  481         }
  482 
  483         error = 0;
  484         DSP_FIXUP_ERROR();
  485 
  486         if (error != 0) {
  487                 (void)snd_clone_release(i_dev);
  488                 PCM_UNLOCK(d);
  489                 PCM_GIANT_EXIT(d);
  490                 return (error);
  491         }
  492 
  493         /*
  494          * That is just enough. Acquire and unlock pcm lock so
  495          * the other will just have to wait until we finish doing
  496          * everything.
  497          */
  498         PCM_ACQUIRE(d);
  499         PCM_UNLOCK(d);
  500 
  501         devtype = PCMDEV(i_dev);
  502         wdevunit = -1;
  503         rdevunit = -1;
  504         fmt = 0;
  505         spd = 0;
  506         volctl = DSP_CDEV_VOLCTL_NONE;
  507 
  508         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
  509                 if (devtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
  510                         continue;
  511                 /*
  512                  * Volume control only valid for DSPHW devices,
  513                  * and it must be opened in opposite direction be it
  514                  * simplex or duplex. Anything else will be handled
  515                  * as usual.
  516                  */
  517                 if (dsp_cdevs[i].query == DSP_CDEV_TYPE_WRONLY) {
  518                         if (dsp_cdevs[i].volctl != 0 &&
  519                             DSP_F_READ(flags)) {
  520                                 volctl = DSP_CDEV_VOLCTL_WRITE;
  521                                 flags &= ~FREAD;
  522                                 flags |= FWRITE;
  523                         }
  524                         if (DSP_F_READ(flags)) {
  525                                 (void)snd_clone_release(i_dev);
  526                                 PCM_RELEASE_QUICK(d);
  527                                 PCM_GIANT_EXIT(d);
  528                                 return (ENOTSUP);
  529                         }
  530                         wdevunit = dev2unit(i_dev);
  531                 } else if (dsp_cdevs[i].query == DSP_CDEV_TYPE_RDONLY) {
  532                         if (dsp_cdevs[i].volctl != 0 &&
  533                             DSP_F_WRITE(flags)) {
  534                                 volctl = DSP_CDEV_VOLCTL_READ;
  535                                 flags &= ~FWRITE;
  536                                 flags |= FREAD;
  537                         }
  538                         if (DSP_F_WRITE(flags)) {
  539                                 (void)snd_clone_release(i_dev);
  540                                 PCM_RELEASE_QUICK(d);
  541                                 PCM_GIANT_EXIT(d);
  542                                 return (ENOTSUP);
  543                         }
  544                         rdevunit = dev2unit(i_dev);
  545                 }
  546                 fmt = dsp_cdevs[i].fmt;
  547                 spd = dsp_cdevs[i].spd;
  548                 break;
  549         }
  550 
  551         /* No matching devtype? */
  552         if (fmt == 0 || spd == 0)
  553                 panic("impossible devtype %d", devtype);
  554 
  555         rdch = NULL;
  556         wrch = NULL;
  557         rderror = 0;
  558         wrerror = 0;
  559 
  560         /*
  561          * if we get here, the open request is valid- either:
  562          *   * we were previously not open
  563          *   * we were open for play xor record and the opener wants
  564          *     the non-open direction
  565          */
  566         if (DSP_F_READ(flags)) {
  567                 /* open for read */
  568                 rderror = pcm_chnalloc(d, &rdch, PCMDIR_REC,
  569                     td->td_proc->p_pid, td->td_proc->p_comm, rdevunit);
  570 
  571                 if (rderror == 0 && chn_reset(rdch, fmt, spd) != 0)
  572                         rderror = ENXIO;
  573 
  574                 if (volctl == DSP_CDEV_VOLCTL_READ)
  575                         rderror = 0;
  576 
  577                 if (rderror != 0) {
  578                         if (rdch != NULL)
  579                                 pcm_chnrelease(rdch);
  580                         if (!DSP_F_DUPLEX(flags)) {
  581                                 (void)snd_clone_release(i_dev);
  582                                 PCM_RELEASE_QUICK(d);
  583                                 PCM_GIANT_EXIT(d);
  584                                 return (rderror);
  585                         }
  586                         rdch = NULL;
  587                 } else if (volctl == DSP_CDEV_VOLCTL_READ) {
  588                         if (rdch != NULL) {
  589                                 pcm_chnref(rdch, 1);
  590                                 pcm_chnrelease(rdch);
  591                         }
  592                 } else {
  593                         if (flags & O_NONBLOCK)
  594                                 rdch->flags |= CHN_F_NBIO;
  595                         if (flags & O_EXCL)
  596                                 rdch->flags |= CHN_F_EXCLUSIVE;
  597                         pcm_chnref(rdch, 1);
  598                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  599                                 chn_vpc_reset(rdch, SND_VOL_C_PCM, 0);
  600                         CHN_UNLOCK(rdch);
  601                 }
  602         }
  603 
  604         if (DSP_F_WRITE(flags)) {
  605                 /* open for write */
  606                 wrerror = pcm_chnalloc(d, &wrch, PCMDIR_PLAY,
  607                     td->td_proc->p_pid, td->td_proc->p_comm, wdevunit);
  608 
  609                 if (wrerror == 0 && chn_reset(wrch, fmt, spd) != 0)
  610                         wrerror = ENXIO;
  611 
  612                 if (volctl == DSP_CDEV_VOLCTL_WRITE)
  613                         wrerror = 0;
  614 
  615                 if (wrerror != 0) {
  616                         if (wrch != NULL)
  617                                 pcm_chnrelease(wrch);
  618                         if (!DSP_F_DUPLEX(flags)) {
  619                                 if (rdch != NULL) {
  620                                         /*
  621                                          * Lock, deref and release previously
  622                                          * created record channel
  623                                          */
  624                                         CHN_LOCK(rdch);
  625                                         pcm_chnref(rdch, -1);
  626                                         pcm_chnrelease(rdch);
  627                                 }
  628                                 (void)snd_clone_release(i_dev);
  629                                 PCM_RELEASE_QUICK(d);
  630                                 PCM_GIANT_EXIT(d);
  631                                 return (wrerror);
  632                         }
  633                         wrch = NULL;
  634                 } else if (volctl == DSP_CDEV_VOLCTL_WRITE) {
  635                         if (wrch != NULL) {
  636                                 pcm_chnref(wrch, 1);
  637                                 pcm_chnrelease(wrch);
  638                         }
  639                 } else {
  640                         if (flags & O_NONBLOCK)
  641                                 wrch->flags |= CHN_F_NBIO;
  642                         if (flags & O_EXCL)
  643                                 wrch->flags |= CHN_F_EXCLUSIVE;
  644                         pcm_chnref(wrch, 1);
  645                         if (volctl == DSP_CDEV_VOLCTL_NONE)
  646                                 chn_vpc_reset(wrch, SND_VOL_C_PCM, 0);
  647                         CHN_UNLOCK(wrch);
  648                 }
  649         }
  650 
  651 
  652         PCM_LOCK(d);
  653 
  654         /*
  655          * We're done. Allocate channels information for this cdev.
  656          */
  657         switch (volctl) {
  658         case DSP_CDEV_VOLCTL_READ:
  659                 KASSERT(wrch == NULL, ("wrch=%p not null!", wrch));
  660                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, rdch);
  661                 break;
  662         case DSP_CDEV_VOLCTL_WRITE:
  663                 KASSERT(rdch == NULL, ("rdch=%p not null!", rdch));
  664                 dsp_cdevinfo_alloc(i_dev, NULL, NULL, wrch);
  665                 break;
  666         case DSP_CDEV_VOLCTL_NONE:
  667         default:
  668                 if (wrch == NULL && rdch == NULL) {
  669                         (void)snd_clone_release(i_dev);
  670                         PCM_RELEASE(d);
  671                         PCM_UNLOCK(d);
  672                         PCM_GIANT_EXIT(d);
  673                         if (wrerror != 0)
  674                                 return (wrerror);
  675                         if (rderror != 0)
  676                                 return (rderror);
  677                         return (EINVAL);
  678                 }
  679                 dsp_cdevinfo_alloc(i_dev, rdch, wrch, NULL);
  680                 if (rdch != NULL)
  681                         CHN_INSERT_HEAD(d, rdch, channels.pcm.opened);
  682                 if (wrch != NULL)
  683                         CHN_INSERT_HEAD(d, wrch, channels.pcm.opened);
  684                 break;
  685         }
  686 
  687         /*
  688          * Increase clone refcount for its automatic garbage collector.
  689          */
  690         (void)snd_clone_ref(i_dev);
  691 
  692         PCM_RELEASE(d);
  693         PCM_UNLOCK(d);
  694 
  695         PCM_GIANT_LEAVE(d);
  696 
  697         return (0);
  698 }
  699 
  700 static int
  701 dsp_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  702 {
  703         struct pcm_channel *rdch, *wrch, *volch;
  704         struct snddev_info *d;
  705         int sg_ids, rdref, wdref;
  706 
  707         d = dsp_get_info(i_dev);
  708         if (!DSP_REGISTERED(d, i_dev))
  709                 return (EBADF);
  710 
  711         PCM_GIANT_ENTER(d);
  712 
  713         PCM_LOCK(d);
  714         PCM_WAIT(d);
  715         PCM_ACQUIRE(d);
  716 
  717         rdch = PCM_RDCH(i_dev);
  718         wrch = PCM_WRCH(i_dev);
  719         volch = PCM_VOLCH(i_dev);
  720 
  721         PCM_RDCH(i_dev) = NULL;
  722         PCM_WRCH(i_dev) = NULL;
  723         PCM_VOLCH(i_dev) = NULL;
  724 
  725         rdref = -1;
  726         wdref = -1;
  727 
  728         if (volch != NULL) {
  729                 if (volch == rdch)
  730                         rdref--;
  731                 else if (volch == wrch)
  732                         wdref--;
  733                 else {
  734                         CHN_LOCK(volch);
  735                         pcm_chnref(volch, -1);
  736                         CHN_UNLOCK(volch);
  737                 }
  738         }
  739 
  740         if (rdch != NULL)
  741                 CHN_REMOVE(d, rdch, channels.pcm.opened);
  742         if (wrch != NULL)
  743                 CHN_REMOVE(d, wrch, channels.pcm.opened);
  744 
  745         if (rdch != NULL || wrch != NULL) {
  746                 PCM_UNLOCK(d);
  747                 if (rdch != NULL) {
  748                         /*
  749                          * The channel itself need not be locked because:
  750                          *   a)  Adding a channel to a syncgroup happens only
  751                          *       in dsp_ioctl(), which cannot run concurrently
  752                          *       to dsp_close().
  753                          *   b)  The syncmember pointer (sm) is protected by
  754                          *       the global syncgroup list lock.
  755                          *   c)  A channel can't just disappear, invalidating
  756                          *       pointers, unless it's closed/dereferenced
  757                          *       first.
  758                          */
  759                         PCM_SG_LOCK();
  760                         sg_ids = chn_syncdestroy(rdch);
  761                         PCM_SG_UNLOCK();
  762                         if (sg_ids != 0)
  763                                 free_unr(pcmsg_unrhdr, sg_ids);
  764 
  765                         CHN_LOCK(rdch);
  766                         pcm_chnref(rdch, rdref);
  767                         chn_abort(rdch); /* won't sleep */
  768                         rdch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  769                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  770                         chn_reset(rdch, 0, 0);
  771                         pcm_chnrelease(rdch);
  772                 }
  773                 if (wrch != NULL) {
  774                         /*
  775                          * Please see block above.
  776                          */
  777                         PCM_SG_LOCK();
  778                         sg_ids = chn_syncdestroy(wrch);
  779                         PCM_SG_UNLOCK();
  780                         if (sg_ids != 0)
  781                                 free_unr(pcmsg_unrhdr, sg_ids);
  782 
  783                         CHN_LOCK(wrch);
  784                         pcm_chnref(wrch, wdref);
  785                         chn_flush(wrch); /* may sleep */
  786                         wrch->flags &= ~(CHN_F_RUNNING | CHN_F_MMAP |
  787                             CHN_F_DEAD | CHN_F_EXCLUSIVE);
  788                         chn_reset(wrch, 0, 0);
  789                         pcm_chnrelease(wrch);
  790                 }
  791                 PCM_LOCK(d);
  792         }
  793 
  794         dsp_cdevinfo_free(i_dev);
  795         /*
  796          * Release clone busy state and unref it so the automatic
  797          * garbage collector will get the hint and do the remaining
  798          * cleanup process.
  799          */
  800         (void)snd_clone_release(i_dev);
  801 
  802         /*
  803          * destroy_dev() might sleep, so release pcm lock
  804          * here and rely on pcm cv serialization.
  805          */
  806         PCM_UNLOCK(d);
  807         (void)snd_clone_unref(i_dev);
  808         PCM_LOCK(d);
  809 
  810         PCM_RELEASE(d);
  811         PCM_UNLOCK(d);
  812 
  813         PCM_GIANT_LEAVE(d);
  814 
  815         return (0);
  816 }
  817 
  818 static __inline int
  819 dsp_io_ops(struct cdev *i_dev, struct uio *buf)
  820 {
  821         struct snddev_info *d;
  822         struct pcm_channel **ch, *rdch, *wrch;
  823         int (*chn_io)(struct pcm_channel *, struct uio *);
  824         int prio, ret;
  825         pid_t runpid;
  826 
  827         KASSERT(i_dev != NULL && buf != NULL &&
  828             (buf->uio_rw == UIO_READ || buf->uio_rw == UIO_WRITE),
  829             ("%s(): io train wreck!", __func__));
  830 
  831         d = dsp_get_info(i_dev);
  832         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
  833                 return (EBADF);
  834 
  835         PCM_GIANT_ENTER(d);
  836 
  837         switch (buf->uio_rw) {
  838         case UIO_READ:
  839                 prio = SD_F_PRIO_RD;
  840                 ch = &rdch;
  841                 chn_io = chn_read;
  842                 break;
  843         case UIO_WRITE:
  844                 prio = SD_F_PRIO_WR;
  845                 ch = &wrch;
  846                 chn_io = chn_write;
  847                 break;
  848         default:
  849                 panic("invalid/corrupted uio direction: %d", buf->uio_rw);
  850                 break;
  851         }
  852 
  853         rdch = NULL;
  854         wrch = NULL;
  855         runpid = buf->uio_td->td_proc->p_pid;
  856 
  857         getchns(i_dev, &rdch, &wrch, prio);
  858 
  859         if (*ch == NULL || !((*ch)->flags & CHN_F_BUSY)) {
  860                 PCM_GIANT_EXIT(d);
  861                 return (EBADF);
  862         }
  863 
  864         if (((*ch)->flags & (CHN_F_MMAP | CHN_F_DEAD)) ||
  865             (((*ch)->flags & CHN_F_RUNNING) && (*ch)->pid != runpid)) {
  866                 relchns(i_dev, rdch, wrch, prio);
  867                 PCM_GIANT_EXIT(d);
  868                 return (EINVAL);
  869         } else if (!((*ch)->flags & CHN_F_RUNNING)) {
  870                 (*ch)->flags |= CHN_F_RUNNING;
  871                 (*ch)->pid = runpid;
  872         }
  873 
  874         /*
  875          * chn_read/write must give up channel lock in order to copy bytes
  876          * from/to userland, so up the "in progress" counter to make sure
  877          * someone else doesn't come along and muss up the buffer.
  878          */
  879         ++(*ch)->inprog;
  880         ret = chn_io(*ch, buf);
  881         --(*ch)->inprog;
  882 
  883         CHN_BROADCAST(&(*ch)->cv);
  884 
  885         relchns(i_dev, rdch, wrch, prio);
  886 
  887         PCM_GIANT_LEAVE(d);
  888 
  889         return (ret);
  890 }
  891 
  892 static int
  893 dsp_read(struct cdev *i_dev, struct uio *buf, int flag)
  894 {
  895         return (dsp_io_ops(i_dev, buf));
  896 }
  897 
  898 static int
  899 dsp_write(struct cdev *i_dev, struct uio *buf, int flag)
  900 {
  901         return (dsp_io_ops(i_dev, buf));
  902 }
  903 
  904 static int
  905 dsp_get_volume_channel(struct cdev *dev, struct pcm_channel **volch)
  906 {
  907         struct snddev_info *d;
  908         struct pcm_channel *c;
  909         int unit;
  910 
  911         KASSERT(dev != NULL && volch != NULL,
  912             ("%s(): NULL query dev=%p volch=%p", __func__, dev, volch));
  913 
  914         d = dsp_get_info(dev);
  915         if (!PCM_REGISTERED(d)) {
  916                 *volch = NULL;
  917                 return (EINVAL);
  918         }
  919 
  920         PCM_UNLOCKASSERT(d);
  921 
  922         *volch = NULL;
  923 
  924         c = PCM_VOLCH(dev);
  925         if (c != NULL) {
  926                 if (!(c->feederflags & (1 << FEEDER_VOLUME)))
  927                         return (-1);
  928                 *volch = c;
  929                 return (0);
  930         }
  931 
  932         PCM_LOCK(d);
  933         PCM_WAIT(d);
  934         PCM_ACQUIRE(d);
  935 
  936         unit = dev2unit(dev);
  937 
  938         CHN_FOREACH(c, d, channels.pcm) {
  939                 CHN_LOCK(c);
  940                 if (c->unit != unit) {
  941                         CHN_UNLOCK(c);
  942                         continue;
  943                 }
  944                 *volch = c;
  945                 pcm_chnref(c, 1);
  946                 PCM_VOLCH(dev) = c;
  947                 CHN_UNLOCK(c);
  948                 PCM_RELEASE(d);
  949                 PCM_UNLOCK(d);
  950                 return ((c->feederflags & (1 << FEEDER_VOLUME)) ? 0 : -1);
  951         }
  952 
  953         PCM_RELEASE(d);
  954         PCM_UNLOCK(d);
  955 
  956         return (EINVAL);
  957 }
  958 
  959 static int
  960 dsp_ioctl_channel(struct cdev *dev, struct pcm_channel *volch, u_long cmd,
  961     caddr_t arg)
  962 {
  963         struct snddev_info *d;
  964         struct pcm_channel *rdch, *wrch;
  965         int j, devtype, ret;
  966 
  967         d = dsp_get_info(dev);
  968         if (!PCM_REGISTERED(d) || !(dsp_get_flags(dev) & SD_F_VPC))
  969                 return (-1);
  970 
  971         PCM_UNLOCKASSERT(d);
  972 
  973         j = cmd & 0xff;
  974 
  975         rdch = PCM_RDCH(dev);
  976         wrch = PCM_WRCH(dev);
  977 
  978         /* No specific channel, look into cache */
  979         if (volch == NULL)
  980                 volch = PCM_VOLCH(dev);
  981 
  982         /* Look harder */
  983         if (volch == NULL) {
  984                 if (j == SOUND_MIXER_RECLEV && rdch != NULL)
  985                         volch = rdch;
  986                 else if (j == SOUND_MIXER_PCM && wrch != NULL)
  987                         volch = wrch;
  988         }
  989 
  990         devtype = PCMDEV(dev);
  991 
  992         /* Look super harder */
  993         if (volch == NULL &&
  994             (devtype == SND_DEV_DSPHW_PLAY || devtype == SND_DEV_DSPHW_VPLAY ||
  995             devtype == SND_DEV_DSPHW_REC || devtype == SND_DEV_DSPHW_VREC)) {
  996                 ret = dsp_get_volume_channel(dev, &volch);
  997                 if (ret != 0)
  998                         return (ret);
  999                 if (volch == NULL)
 1000                         return (EINVAL);
 1001         }
 1002 
 1003         /* Final validation */
 1004         if (volch != NULL) {
 1005                 CHN_LOCK(volch);
 1006                 if (!(volch->feederflags & (1 << FEEDER_VOLUME))) {
 1007                         CHN_UNLOCK(volch);
 1008                         return (-1);
 1009                 }
 1010                 if (volch->direction == PCMDIR_PLAY)
 1011                         wrch = volch;
 1012                 else
 1013                         rdch = volch;
 1014         }
 1015 
 1016         ret = EINVAL;
 1017 
 1018         if (volch != NULL &&
 1019             ((j == SOUND_MIXER_PCM && volch->direction == PCMDIR_PLAY) ||
 1020             (j == SOUND_MIXER_RECLEV && volch->direction == PCMDIR_REC))) {
 1021                 if ((cmd & ~0xff) == MIXER_WRITE(0)) {
 1022                         int left, right, center;
 1023 
 1024                         left = *(int *)arg & 0x7f;
 1025                         right = ((*(int *)arg) >> 8) & 0x7f;
 1026                         center = (left + right) >> 1;
 1027                         chn_setvolume_multi(volch, SND_VOL_C_PCM, left, right,
 1028                             center);
 1029                 } else if ((cmd & ~0xff) == MIXER_READ(0)) {
 1030                         *(int *)arg = CHN_GETVOLUME(volch,
 1031                                 SND_VOL_C_PCM, SND_CHN_T_FL);
 1032                         *(int *)arg |= CHN_GETVOLUME(volch,
 1033                                 SND_VOL_C_PCM, SND_CHN_T_FR) << 8;
 1034                 }
 1035                 ret = 0;
 1036         } else if (rdch != NULL || wrch != NULL) {
 1037                 switch (j) {
 1038                 case SOUND_MIXER_DEVMASK:
 1039                 case SOUND_MIXER_CAPS:
 1040                 case SOUND_MIXER_STEREODEVS:
 1041                         if ((cmd & ~0xff) == MIXER_READ(0)) {
 1042                                 *(int *)arg = 0;
 1043                                 if (rdch != NULL)
 1044                                         *(int *)arg |= SOUND_MASK_RECLEV;
 1045                                 if (wrch != NULL)
 1046                                         *(int *)arg |= SOUND_MASK_PCM;
 1047                         }
 1048                         ret = 0;
 1049                         break;
 1050                 case SOUND_MIXER_RECMASK:
 1051                 case SOUND_MIXER_RECSRC:
 1052                         if ((cmd & ~0xff) == MIXER_READ(0))
 1053                                 *(int *)arg = 0;
 1054                         ret = 0;
 1055                         break;
 1056                 default:
 1057                         break;
 1058                 }
 1059         }
 1060 
 1061         if (volch != NULL)
 1062                 CHN_UNLOCK(volch);
 1063 
 1064         return (ret);
 1065 }
 1066 
 1067 static int
 1068 dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode,
 1069     struct thread *td)
 1070 {
 1071         struct pcm_channel *chn, *rdch, *wrch;
 1072         struct snddev_info *d;
 1073         u_long xcmd;
 1074         int *arg_i, ret, tmp;
 1075 
 1076         d = dsp_get_info(i_dev);
 1077         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 1078                 return (EBADF);
 1079 
 1080         PCM_GIANT_ENTER(d);
 1081 
 1082         arg_i = (int *)arg;
 1083         ret = 0;
 1084         xcmd = 0;
 1085         chn = NULL;
 1086 
 1087         if (IOCGROUP(cmd) == 'M') {
 1088                 if (cmd == OSS_GETVERSION) {
 1089                         *arg_i = SOUND_VERSION;
 1090                         PCM_GIANT_EXIT(d);
 1091                         return (0);
 1092                 }
 1093                 ret = dsp_ioctl_channel(i_dev, PCM_VOLCH(i_dev), cmd, arg);
 1094                 if (ret != -1) {
 1095                         PCM_GIANT_EXIT(d);
 1096                         return (ret);
 1097                 }
 1098 
 1099                 if (d->mixer_dev != NULL) {
 1100                         PCM_ACQUIRE_QUICK(d);
 1101                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1102                             MIXER_CMD_DIRECT);
 1103                         PCM_RELEASE_QUICK(d);
 1104                 } else
 1105                         ret = EBADF;
 1106 
 1107                 PCM_GIANT_EXIT(d);
 1108 
 1109                 return (ret);
 1110         }
 1111 
 1112         /*
 1113          * Certain ioctls may be made on any type of device (audio, mixer,
 1114          * and MIDI).  Handle those special cases here.
 1115          */
 1116         if (IOCGROUP(cmd) == 'X') {
 1117                 PCM_ACQUIRE_QUICK(d);
 1118                 switch(cmd) {
 1119                 case SNDCTL_SYSINFO:
 1120                         sound_oss_sysinfo((oss_sysinfo *)arg);
 1121                         break;
 1122                 case SNDCTL_CARDINFO:
 1123                         ret = sound_oss_card_info((oss_card_info *)arg);
 1124                         break;
 1125                 case SNDCTL_AUDIOINFO:
 1126                 case SNDCTL_AUDIOINFO_EX:
 1127                 case SNDCTL_ENGINEINFO:
 1128                         ret = dsp_oss_audioinfo(i_dev, (oss_audioinfo *)arg);
 1129                         break;
 1130                 case SNDCTL_MIXERINFO:
 1131                         ret = mixer_oss_mixerinfo(i_dev, (oss_mixerinfo *)arg);
 1132                         break;
 1133                 default:
 1134                         ret = EINVAL;
 1135                 }
 1136                 PCM_RELEASE_QUICK(d);
 1137                 PCM_GIANT_EXIT(d);
 1138                 return (ret);
 1139         }
 1140 
 1141         getchns(i_dev, &rdch, &wrch, 0);
 1142 
 1143         if (wrch != NULL && (wrch->flags & CHN_F_DEAD))
 1144                 wrch = NULL;
 1145         if (rdch != NULL && (rdch->flags & CHN_F_DEAD))
 1146                 rdch = NULL;
 1147 
 1148         if (wrch == NULL && rdch == NULL) {
 1149                 PCM_GIANT_EXIT(d);
 1150                 return (EINVAL);
 1151         }
 1152 
 1153         switch(cmd) {
 1154 #ifdef OLDPCM_IOCTL
 1155         /*
 1156          * we start with the new ioctl interface.
 1157          */
 1158         case AIONWRITE: /* how many bytes can write ? */
 1159                 if (wrch) {
 1160                         CHN_LOCK(wrch);
 1161 /*
 1162                 if (wrch && wrch->bufhard.dl)
 1163                         while (chn_wrfeed(wrch) == 0);
 1164 */
 1165                         *arg_i = sndbuf_getfree(wrch->bufsoft);
 1166                         CHN_UNLOCK(wrch);
 1167                 } else {
 1168                         *arg_i = 0;
 1169                         ret = EINVAL;
 1170                 }
 1171                 break;
 1172 
 1173         case AIOSSIZE:     /* set the current blocksize */
 1174                 {
 1175                         struct snd_size *p = (struct snd_size *)arg;
 1176 
 1177                         p->play_size = 0;
 1178                         p->rec_size = 0;
 1179                         PCM_ACQUIRE_QUICK(d);
 1180                         if (wrch) {
 1181                                 CHN_LOCK(wrch);
 1182                                 chn_setblocksize(wrch, 2, p->play_size);
 1183                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1184                                 CHN_UNLOCK(wrch);
 1185                         }
 1186                         if (rdch) {
 1187                                 CHN_LOCK(rdch);
 1188                                 chn_setblocksize(rdch, 2, p->rec_size);
 1189                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1190                                 CHN_UNLOCK(rdch);
 1191                         }
 1192                         PCM_RELEASE_QUICK(d);
 1193                 }
 1194                 break;
 1195         case AIOGSIZE:  /* get the current blocksize */
 1196                 {
 1197                         struct snd_size *p = (struct snd_size *)arg;
 1198 
 1199                         if (wrch) {
 1200                                 CHN_LOCK(wrch);
 1201                                 p->play_size = sndbuf_getblksz(wrch->bufsoft);
 1202                                 CHN_UNLOCK(wrch);
 1203                         }
 1204                         if (rdch) {
 1205                                 CHN_LOCK(rdch);
 1206                                 p->rec_size = sndbuf_getblksz(rdch->bufsoft);
 1207                                 CHN_UNLOCK(rdch);
 1208                         }
 1209                 }
 1210                 break;
 1211 
 1212         case AIOSFMT:
 1213         case AIOGFMT:
 1214                 {
 1215                         snd_chan_param *p = (snd_chan_param *)arg;
 1216 
 1217                         if (cmd == AIOSFMT &&
 1218                             ((p->play_format != 0 && p->play_rate == 0) ||
 1219                             (p->rec_format != 0 && p->rec_rate == 0))) {
 1220                                 ret = EINVAL;
 1221                                 break;
 1222                         }
 1223                         PCM_ACQUIRE_QUICK(d);
 1224                         if (wrch) {
 1225                                 CHN_LOCK(wrch);
 1226                                 if (cmd == AIOSFMT && p->play_format != 0) {
 1227                                         chn_setformat(wrch,
 1228                                             SND_FORMAT(p->play_format,
 1229                                             AFMT_CHANNEL(wrch->format),
 1230                                             AFMT_EXTCHANNEL(wrch->format)));
 1231                                         chn_setspeed(wrch, p->play_rate);
 1232                                 }
 1233                                 p->play_rate = wrch->speed;
 1234                                 p->play_format = AFMT_ENCODING(wrch->format);
 1235                                 CHN_UNLOCK(wrch);
 1236                         } else {
 1237                                 p->play_rate = 0;
 1238                                 p->play_format = 0;
 1239                         }
 1240                         if (rdch) {
 1241                                 CHN_LOCK(rdch);
 1242                                 if (cmd == AIOSFMT && p->rec_format != 0) {
 1243                                         chn_setformat(rdch,
 1244                                             SND_FORMAT(p->rec_format,
 1245                                             AFMT_CHANNEL(rdch->format),
 1246                                             AFMT_EXTCHANNEL(rdch->format)));
 1247                                         chn_setspeed(rdch, p->rec_rate);
 1248                                 }
 1249                                 p->rec_rate = rdch->speed;
 1250                                 p->rec_format = AFMT_ENCODING(rdch->format);
 1251                                 CHN_UNLOCK(rdch);
 1252                         } else {
 1253                                 p->rec_rate = 0;
 1254                                 p->rec_format = 0;
 1255                         }
 1256                         PCM_RELEASE_QUICK(d);
 1257                 }
 1258                 break;
 1259 
 1260         case AIOGCAP:     /* get capabilities */
 1261                 {
 1262                         snd_capabilities *p = (snd_capabilities *)arg;
 1263                         struct pcmchan_caps *pcaps = NULL, *rcaps = NULL;
 1264                         struct cdev *pdev;
 1265 
 1266                         PCM_LOCK(d);
 1267                         if (rdch) {
 1268                                 CHN_LOCK(rdch);
 1269                                 rcaps = chn_getcaps(rdch);
 1270                         }
 1271                         if (wrch) {
 1272                                 CHN_LOCK(wrch);
 1273                                 pcaps = chn_getcaps(wrch);
 1274                         }
 1275                         p->rate_min = max(rcaps? rcaps->minspeed : 0,
 1276                                           pcaps? pcaps->minspeed : 0);
 1277                         p->rate_max = min(rcaps? rcaps->maxspeed : 1000000,
 1278                                           pcaps? pcaps->maxspeed : 1000000);
 1279                         p->bufsize = min(rdch? sndbuf_getsize(rdch->bufsoft) : 1000000,
 1280                                          wrch? sndbuf_getsize(wrch->bufsoft) : 1000000);
 1281                         /* XXX bad on sb16 */
 1282                         p->formats = (rdch? chn_getformats(rdch) : 0xffffffff) &
 1283                                      (wrch? chn_getformats(wrch) : 0xffffffff);
 1284                         if (rdch && wrch)
 1285                                 p->formats |= (dsp_get_flags(i_dev) & SD_F_SIMPLEX)? 0 : AFMT_FULLDUPLEX;
 1286                         pdev = d->mixer_dev;
 1287                         p->mixers = 1; /* default: one mixer */
 1288                         p->inputs = pdev->si_drv1? mix_getdevs(pdev->si_drv1) : 0;
 1289                         p->left = p->right = 100;
 1290                         if (wrch)
 1291                                 CHN_UNLOCK(wrch);
 1292                         if (rdch)
 1293                                 CHN_UNLOCK(rdch);
 1294                         PCM_UNLOCK(d);
 1295                 }
 1296                 break;
 1297 
 1298         case AIOSTOP:
 1299                 if (*arg_i == AIOSYNC_PLAY && wrch) {
 1300                         CHN_LOCK(wrch);
 1301                         *arg_i = chn_abort(wrch);
 1302                         CHN_UNLOCK(wrch);
 1303                 } else if (*arg_i == AIOSYNC_CAPTURE && rdch) {
 1304                         CHN_LOCK(rdch);
 1305                         *arg_i = chn_abort(rdch);
 1306                         CHN_UNLOCK(rdch);
 1307                 } else {
 1308                         printf("AIOSTOP: bad channel 0x%x\n", *arg_i);
 1309                         *arg_i = 0;
 1310                 }
 1311                 break;
 1312 
 1313         case AIOSYNC:
 1314                 printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n",
 1315                         ((snd_sync_parm *)arg)->chan, ((snd_sync_parm *)arg)->pos);
 1316                 break;
 1317 #endif
 1318         /*
 1319          * here follow the standard ioctls (filio.h etc.)
 1320          */
 1321         case FIONREAD: /* get # bytes to read */
 1322                 if (rdch) {
 1323                         CHN_LOCK(rdch);
 1324 /*                      if (rdch && rdch->bufhard.dl)
 1325                                 while (chn_rdfeed(rdch) == 0);
 1326 */
 1327                         *arg_i = sndbuf_getready(rdch->bufsoft);
 1328                         CHN_UNLOCK(rdch);
 1329                 } else {
 1330                         *arg_i = 0;
 1331                         ret = EINVAL;
 1332                 }
 1333                 break;
 1334 
 1335         case FIOASYNC: /*set/clear async i/o */
 1336                 DEB( printf("FIOASYNC\n") ; )
 1337                 break;
 1338 
 1339         case SNDCTL_DSP_NONBLOCK: /* set non-blocking i/o */
 1340         case FIONBIO: /* set/clear non-blocking i/o */
 1341                 if (rdch) {
 1342                         CHN_LOCK(rdch);
 1343                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1344                                 rdch->flags |= CHN_F_NBIO;
 1345                         else
 1346                                 rdch->flags &= ~CHN_F_NBIO;
 1347                         CHN_UNLOCK(rdch);
 1348                 }
 1349                 if (wrch) {
 1350                         CHN_LOCK(wrch);
 1351                         if (cmd == SNDCTL_DSP_NONBLOCK || *arg_i)
 1352                                 wrch->flags |= CHN_F_NBIO;
 1353                         else
 1354                                 wrch->flags &= ~CHN_F_NBIO;
 1355                         CHN_UNLOCK(wrch);
 1356                 }
 1357                 break;
 1358 
 1359         /*
 1360          * Finally, here is the linux-compatible ioctl interface
 1361          */
 1362 #define THE_REAL_SNDCTL_DSP_GETBLKSIZE _IOWR('P', 4, int)
 1363         case THE_REAL_SNDCTL_DSP_GETBLKSIZE:
 1364         case SNDCTL_DSP_GETBLKSIZE:
 1365                 chn = wrch ? wrch : rdch;
 1366                 if (chn) {
 1367                         CHN_LOCK(chn);
 1368                         *arg_i = sndbuf_getblksz(chn->bufsoft);
 1369                         CHN_UNLOCK(chn);
 1370                 } else {
 1371                         *arg_i = 0;
 1372                         ret = EINVAL;
 1373                 }
 1374                 break;
 1375 
 1376         case SNDCTL_DSP_SETBLKSIZE:
 1377                 RANGE(*arg_i, 16, 65536);
 1378                 PCM_ACQUIRE_QUICK(d);
 1379                 if (wrch) {
 1380                         CHN_LOCK(wrch);
 1381                         chn_setblocksize(wrch, 2, *arg_i);
 1382                         CHN_UNLOCK(wrch);
 1383                 }
 1384                 if (rdch) {
 1385                         CHN_LOCK(rdch);
 1386                         chn_setblocksize(rdch, 2, *arg_i);
 1387                         CHN_UNLOCK(rdch);
 1388                 }
 1389                 PCM_RELEASE_QUICK(d);
 1390                 break;
 1391 
 1392         case SNDCTL_DSP_RESET:
 1393                 DEB(printf("dsp reset\n"));
 1394                 if (wrch) {
 1395                         CHN_LOCK(wrch);
 1396                         chn_abort(wrch);
 1397                         chn_resetbuf(wrch);
 1398                         CHN_UNLOCK(wrch);
 1399                 }
 1400                 if (rdch) {
 1401                         CHN_LOCK(rdch);
 1402                         chn_abort(rdch);
 1403                         chn_resetbuf(rdch);
 1404                         CHN_UNLOCK(rdch);
 1405                 }
 1406                 break;
 1407 
 1408         case SNDCTL_DSP_SYNC:
 1409                 DEB(printf("dsp sync\n"));
 1410                 /* chn_sync may sleep */
 1411                 if (wrch) {
 1412                         CHN_LOCK(wrch);
 1413                         chn_sync(wrch, 0);
 1414                         CHN_UNLOCK(wrch);
 1415                 }
 1416                 break;
 1417 
 1418         case SNDCTL_DSP_SPEED:
 1419                 /* chn_setspeed may sleep */
 1420                 tmp = 0;
 1421                 PCM_ACQUIRE_QUICK(d);
 1422                 if (wrch) {
 1423                         CHN_LOCK(wrch);
 1424                         ret = chn_setspeed(wrch, *arg_i);
 1425                         tmp = wrch->speed;
 1426                         CHN_UNLOCK(wrch);
 1427                 }
 1428                 if (rdch && ret == 0) {
 1429                         CHN_LOCK(rdch);
 1430                         ret = chn_setspeed(rdch, *arg_i);
 1431                         if (tmp == 0)
 1432                                 tmp = rdch->speed;
 1433                         CHN_UNLOCK(rdch);
 1434                 }
 1435                 PCM_RELEASE_QUICK(d);
 1436                 *arg_i = tmp;
 1437                 break;
 1438 
 1439         case SOUND_PCM_READ_RATE:
 1440                 chn = wrch ? wrch : rdch;
 1441                 if (chn) {
 1442                         CHN_LOCK(chn);
 1443                         *arg_i = chn->speed;
 1444                         CHN_UNLOCK(chn);
 1445                 } else {
 1446                         *arg_i = 0;
 1447                         ret = EINVAL;
 1448                 }
 1449                 break;
 1450 
 1451         case SNDCTL_DSP_STEREO:
 1452                 tmp = -1;
 1453                 *arg_i = (*arg_i)? 2 : 1;
 1454                 PCM_ACQUIRE_QUICK(d);
 1455                 if (wrch) {
 1456                         CHN_LOCK(wrch);
 1457                         ret = chn_setformat(wrch,
 1458                             SND_FORMAT(wrch->format, *arg_i, 0));
 1459                         tmp = (AFMT_CHANNEL(wrch->format) > 1)? 1 : 0;
 1460                         CHN_UNLOCK(wrch);
 1461                 }
 1462                 if (rdch && ret == 0) {
 1463                         CHN_LOCK(rdch);
 1464                         ret = chn_setformat(rdch,
 1465                             SND_FORMAT(rdch->format, *arg_i, 0));
 1466                         if (tmp == -1)
 1467                                 tmp = (AFMT_CHANNEL(rdch->format) > 1)? 1 : 0;
 1468                         CHN_UNLOCK(rdch);
 1469                 }
 1470                 PCM_RELEASE_QUICK(d);
 1471                 *arg_i = tmp;
 1472                 break;
 1473 
 1474         case SOUND_PCM_WRITE_CHANNELS:
 1475 /*      case SNDCTL_DSP_CHANNELS: ( == SOUND_PCM_WRITE_CHANNELS) */
 1476                 if (*arg_i < 0) {
 1477                         *arg_i = 0;
 1478                         ret = EINVAL;
 1479                         break;
 1480                 }
 1481                 if (*arg_i != 0) {
 1482                         struct pcmchan_matrix *m;
 1483                         uint32_t ext;
 1484 
 1485                         tmp = 0;
 1486                         if (*arg_i > SND_CHN_MAX)
 1487                                 *arg_i = SND_CHN_MAX;
 1488 
 1489                         m = feeder_matrix_default_channel_map(*arg_i);
 1490                         if (m != NULL)
 1491                                 ext = m->ext;
 1492                         else
 1493                                 ext = 0;
 1494 
 1495                         PCM_ACQUIRE_QUICK(d);
 1496                         if (wrch) {
 1497                                 CHN_LOCK(wrch);
 1498                                 ret = chn_setformat(wrch,
 1499                                     SND_FORMAT(wrch->format, *arg_i, ext));
 1500                                 tmp = AFMT_CHANNEL(wrch->format);
 1501                                 CHN_UNLOCK(wrch);
 1502                         }
 1503                         if (rdch && ret == 0) {
 1504                                 CHN_LOCK(rdch);
 1505                                 ret = chn_setformat(rdch,
 1506                                     SND_FORMAT(rdch->format, *arg_i, ext));
 1507                                 if (tmp == 0)
 1508                                         tmp = AFMT_CHANNEL(rdch->format);
 1509                                 CHN_UNLOCK(rdch);
 1510                         }
 1511                         PCM_RELEASE_QUICK(d);
 1512                         *arg_i = tmp;
 1513                 } else {
 1514                         chn = wrch ? wrch : rdch;
 1515                         CHN_LOCK(chn);
 1516                         *arg_i = AFMT_CHANNEL(chn->format);
 1517                         CHN_UNLOCK(chn);
 1518                 }
 1519                 break;
 1520 
 1521         case SOUND_PCM_READ_CHANNELS:
 1522                 chn = wrch ? wrch : rdch;
 1523                 if (chn) {
 1524                         CHN_LOCK(chn);
 1525                         *arg_i = AFMT_CHANNEL(chn->format);
 1526                         CHN_UNLOCK(chn);
 1527                 } else {
 1528                         *arg_i = 0;
 1529                         ret = EINVAL;
 1530                 }
 1531                 break;
 1532 
 1533         case SNDCTL_DSP_GETFMTS:        /* returns a mask of supported fmts */
 1534                 chn = wrch ? wrch : rdch;
 1535                 if (chn) {
 1536                         CHN_LOCK(chn);
 1537                         *arg_i = chn_getformats(chn);
 1538                         CHN_UNLOCK(chn);
 1539                 } else {
 1540                         *arg_i = 0;
 1541                         ret = EINVAL;
 1542                 }
 1543                 break;
 1544 
 1545         case SNDCTL_DSP_SETFMT: /* sets _one_ format */
 1546                 if (*arg_i != AFMT_QUERY) {
 1547                         tmp = 0;
 1548                         PCM_ACQUIRE_QUICK(d);
 1549                         if (wrch) {
 1550                                 CHN_LOCK(wrch);
 1551                                 ret = chn_setformat(wrch, SND_FORMAT(*arg_i,
 1552                                     AFMT_CHANNEL(wrch->format),
 1553                                     AFMT_EXTCHANNEL(wrch->format)));
 1554                                 tmp = wrch->format;
 1555                                 CHN_UNLOCK(wrch);
 1556                         }
 1557                         if (rdch && ret == 0) {
 1558                                 CHN_LOCK(rdch);
 1559                                 ret = chn_setformat(rdch, SND_FORMAT(*arg_i,
 1560                                     AFMT_CHANNEL(rdch->format),
 1561                                     AFMT_EXTCHANNEL(rdch->format)));
 1562                                 if (tmp == 0)
 1563                                         tmp = rdch->format;
 1564                                 CHN_UNLOCK(rdch);
 1565                         }
 1566                         PCM_RELEASE_QUICK(d);
 1567                         *arg_i = AFMT_ENCODING(tmp);
 1568                 } else {
 1569                         chn = wrch ? wrch : rdch;
 1570                         CHN_LOCK(chn);
 1571                         *arg_i = AFMT_ENCODING(chn->format);
 1572                         CHN_UNLOCK(chn);
 1573                 }
 1574                 break;
 1575 
 1576         case SNDCTL_DSP_SETFRAGMENT:
 1577                 DEB(printf("SNDCTL_DSP_SETFRAGMENT 0x%08x\n", *(int *)arg));
 1578                 {
 1579                         uint32_t fragln = (*arg_i) & 0x0000ffff;
 1580                         uint32_t maxfrags = ((*arg_i) & 0xffff0000) >> 16;
 1581                         uint32_t fragsz;
 1582                         uint32_t r_maxfrags, r_fragsz;
 1583 
 1584                         RANGE(fragln, 4, 16);
 1585                         fragsz = 1 << fragln;
 1586 
 1587                         if (maxfrags == 0)
 1588                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1589                         if (maxfrags < 2)
 1590                                 maxfrags = 2;
 1591                         if (maxfrags * fragsz > CHN_2NDBUFMAXSIZE)
 1592                                 maxfrags = CHN_2NDBUFMAXSIZE / fragsz;
 1593 
 1594                         DEB(printf("SNDCTL_DSP_SETFRAGMENT %d frags, %d sz\n", maxfrags, fragsz));
 1595                         PCM_ACQUIRE_QUICK(d);
 1596                         if (rdch) {
 1597                                 CHN_LOCK(rdch);
 1598                                 ret = chn_setblocksize(rdch, maxfrags, fragsz);
 1599                                 r_maxfrags = sndbuf_getblkcnt(rdch->bufsoft);
 1600                                 r_fragsz = sndbuf_getblksz(rdch->bufsoft);
 1601                                 CHN_UNLOCK(rdch);
 1602                         } else {
 1603                                 r_maxfrags = maxfrags;
 1604                                 r_fragsz = fragsz;
 1605                         }
 1606                         if (wrch && ret == 0) {
 1607                                 CHN_LOCK(wrch);
 1608                                 ret = chn_setblocksize(wrch, maxfrags, fragsz);
 1609                                 maxfrags = sndbuf_getblkcnt(wrch->bufsoft);
 1610                                 fragsz = sndbuf_getblksz(wrch->bufsoft);
 1611                                 CHN_UNLOCK(wrch);
 1612                         } else { /* use whatever came from the read channel */
 1613                                 maxfrags = r_maxfrags;
 1614                                 fragsz = r_fragsz;
 1615                         }
 1616                         PCM_RELEASE_QUICK(d);
 1617 
 1618                         fragln = 0;
 1619                         while (fragsz > 1) {
 1620                                 fragln++;
 1621                                 fragsz >>= 1;
 1622                         }
 1623                         *arg_i = (maxfrags << 16) | fragln;
 1624                 }
 1625                 break;
 1626 
 1627         case SNDCTL_DSP_GETISPACE:
 1628                 /* return the size of data available in the input queue */
 1629                 {
 1630                         audio_buf_info *a = (audio_buf_info *)arg;
 1631                         if (rdch) {
 1632                                 struct snd_dbuf *bs = rdch->bufsoft;
 1633 
 1634                                 CHN_LOCK(rdch);
 1635                                 a->bytes = sndbuf_getready(bs);
 1636                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1637                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1638                                 a->fragsize = sndbuf_getblksz(bs);
 1639                                 CHN_UNLOCK(rdch);
 1640                         } else
 1641                                 ret = EINVAL;
 1642                 }
 1643                 break;
 1644 
 1645         case SNDCTL_DSP_GETOSPACE:
 1646                 /* return space available in the output queue */
 1647                 {
 1648                         audio_buf_info *a = (audio_buf_info *)arg;
 1649                         if (wrch) {
 1650                                 struct snd_dbuf *bs = wrch->bufsoft;
 1651 
 1652                                 CHN_LOCK(wrch);
 1653                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1654                                 a->bytes = sndbuf_getfree(bs);
 1655                                 a->fragments = a->bytes / sndbuf_getblksz(bs);
 1656                                 a->fragstotal = sndbuf_getblkcnt(bs);
 1657                                 a->fragsize = sndbuf_getblksz(bs);
 1658                                 CHN_UNLOCK(wrch);
 1659                         } else
 1660                                 ret = EINVAL;
 1661                 }
 1662                 break;
 1663 
 1664         case SNDCTL_DSP_GETIPTR:
 1665                 {
 1666                         count_info *a = (count_info *)arg;
 1667                         if (rdch) {
 1668                                 struct snd_dbuf *bs = rdch->bufsoft;
 1669 
 1670                                 CHN_LOCK(rdch);
 1671                                 /* XXX abusive DMA update: chn_rdupdate(rdch); */
 1672                                 a->bytes = sndbuf_gettotal(bs);
 1673                                 a->blocks = sndbuf_getblocks(bs) - rdch->blocks;
 1674                                 a->ptr = sndbuf_getfreeptr(bs);
 1675                                 rdch->blocks = sndbuf_getblocks(bs);
 1676                                 CHN_UNLOCK(rdch);
 1677                         } else
 1678                                 ret = EINVAL;
 1679                 }
 1680                 break;
 1681 
 1682         case SNDCTL_DSP_GETOPTR:
 1683                 {
 1684                         count_info *a = (count_info *)arg;
 1685                         if (wrch) {
 1686                                 struct snd_dbuf *bs = wrch->bufsoft;
 1687 
 1688                                 CHN_LOCK(wrch);
 1689                                 /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1690                                 a->bytes = sndbuf_gettotal(bs);
 1691                                 a->blocks = sndbuf_getblocks(bs) - wrch->blocks;
 1692                                 a->ptr = sndbuf_getreadyptr(bs);
 1693                                 wrch->blocks = sndbuf_getblocks(bs);
 1694                                 CHN_UNLOCK(wrch);
 1695                         } else
 1696                                 ret = EINVAL;
 1697                 }
 1698                 break;
 1699 
 1700         case SNDCTL_DSP_GETCAPS:
 1701                 PCM_LOCK(d);
 1702                 *arg_i = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER;
 1703                 if (rdch && wrch && !(dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1704                         *arg_i |= PCM_CAP_DUPLEX;
 1705                 PCM_UNLOCK(d);
 1706                 break;
 1707 
 1708         case SOUND_PCM_READ_BITS:
 1709                 chn = wrch ? wrch : rdch;
 1710                 if (chn) {
 1711                         CHN_LOCK(chn);
 1712                         if (chn->format & AFMT_8BIT)
 1713                                 *arg_i = 8;
 1714                         else if (chn->format & AFMT_16BIT)
 1715                                 *arg_i = 16;
 1716                         else if (chn->format & AFMT_24BIT)
 1717                                 *arg_i = 24;
 1718                         else if (chn->format & AFMT_32BIT)
 1719                                 *arg_i = 32;
 1720                         else
 1721                                 ret = EINVAL;
 1722                         CHN_UNLOCK(chn);
 1723                 } else {
 1724                         *arg_i = 0;
 1725                         ret = EINVAL;
 1726                 }
 1727                 break;
 1728 
 1729         case SNDCTL_DSP_SETTRIGGER:
 1730                 if (rdch) {
 1731                         CHN_LOCK(rdch);
 1732                         rdch->flags &= ~CHN_F_NOTRIGGER;
 1733                         if (*arg_i & PCM_ENABLE_INPUT)
 1734                                 chn_start(rdch, 1);
 1735                         else {
 1736                                 chn_abort(rdch);
 1737                                 chn_resetbuf(rdch);
 1738                                 rdch->flags |= CHN_F_NOTRIGGER;
 1739                         }
 1740                         CHN_UNLOCK(rdch);
 1741                 }
 1742                 if (wrch) {
 1743                         CHN_LOCK(wrch);
 1744                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1745                         if (*arg_i & PCM_ENABLE_OUTPUT)
 1746                                 chn_start(wrch, 1);
 1747                         else {
 1748                                 chn_abort(wrch);
 1749                                 chn_resetbuf(wrch);
 1750                                 wrch->flags |= CHN_F_NOTRIGGER;
 1751                         }
 1752                         CHN_UNLOCK(wrch);
 1753                 }
 1754                 break;
 1755 
 1756         case SNDCTL_DSP_GETTRIGGER:
 1757                 *arg_i = 0;
 1758                 if (wrch) {
 1759                         CHN_LOCK(wrch);
 1760                         if (wrch->flags & CHN_F_TRIGGERED)
 1761                                 *arg_i |= PCM_ENABLE_OUTPUT;
 1762                         CHN_UNLOCK(wrch);
 1763                 }
 1764                 if (rdch) {
 1765                         CHN_LOCK(rdch);
 1766                         if (rdch->flags & CHN_F_TRIGGERED)
 1767                                 *arg_i |= PCM_ENABLE_INPUT;
 1768                         CHN_UNLOCK(rdch);
 1769                 }
 1770                 break;
 1771 
 1772         case SNDCTL_DSP_GETODELAY:
 1773                 if (wrch) {
 1774                         struct snd_dbuf *bs = wrch->bufsoft;
 1775 
 1776                         CHN_LOCK(wrch);
 1777                         /* XXX abusive DMA update: chn_wrupdate(wrch); */
 1778                         *arg_i = sndbuf_getready(bs);
 1779                         CHN_UNLOCK(wrch);
 1780                 } else
 1781                         ret = EINVAL;
 1782                 break;
 1783 
 1784         case SNDCTL_DSP_POST:
 1785                 if (wrch) {
 1786                         CHN_LOCK(wrch);
 1787                         wrch->flags &= ~CHN_F_NOTRIGGER;
 1788                         chn_start(wrch, 1);
 1789                         CHN_UNLOCK(wrch);
 1790                 }
 1791                 break;
 1792 
 1793         case SNDCTL_DSP_SETDUPLEX:
 1794                 /*
 1795                  * switch to full-duplex mode if card is in half-duplex
 1796                  * mode and is able to work in full-duplex mode
 1797                  */
 1798                 PCM_LOCK(d);
 1799                 if (rdch && wrch && (dsp_get_flags(i_dev) & SD_F_SIMPLEX))
 1800                         dsp_set_flags(i_dev, dsp_get_flags(i_dev)^SD_F_SIMPLEX);
 1801                 PCM_UNLOCK(d);
 1802                 break;
 1803 
 1804         /*
 1805          * The following four ioctls are simple wrappers around mixer_ioctl
 1806          * with no further processing.  xcmd is short for "translated
 1807          * command".
 1808          */
 1809         case SNDCTL_DSP_GETRECVOL:
 1810                 if (xcmd == 0) {
 1811                         xcmd = SOUND_MIXER_READ_RECLEV;
 1812                         chn = rdch;
 1813                 }
 1814                 /* FALLTHROUGH */
 1815         case SNDCTL_DSP_SETRECVOL:
 1816                 if (xcmd == 0) {
 1817                         xcmd = SOUND_MIXER_WRITE_RECLEV;
 1818                         chn = rdch;
 1819                 }
 1820                 /* FALLTHROUGH */
 1821         case SNDCTL_DSP_GETPLAYVOL:
 1822                 if (xcmd == 0) {
 1823                         xcmd = SOUND_MIXER_READ_PCM;
 1824                         chn = wrch;
 1825                 }
 1826                 /* FALLTHROUGH */
 1827         case SNDCTL_DSP_SETPLAYVOL:
 1828                 if (xcmd == 0) {
 1829                         xcmd = SOUND_MIXER_WRITE_PCM;
 1830                         chn = wrch;
 1831                 }
 1832 
 1833                 ret = dsp_ioctl_channel(i_dev, chn, xcmd, arg);
 1834                 if (ret != -1) {
 1835                         PCM_GIANT_EXIT(d);
 1836                         return (ret);
 1837                 }
 1838 
 1839                 if (d->mixer_dev != NULL) {
 1840                         PCM_ACQUIRE_QUICK(d);
 1841                         ret = mixer_ioctl_cmd(d->mixer_dev, xcmd, arg, -1, td,
 1842                             MIXER_CMD_DIRECT);
 1843                         PCM_RELEASE_QUICK(d);
 1844                 } else
 1845                         ret = ENOTSUP;
 1846 
 1847                 break;
 1848 
 1849         case SNDCTL_DSP_GET_RECSRC_NAMES:
 1850         case SNDCTL_DSP_GET_RECSRC:
 1851         case SNDCTL_DSP_SET_RECSRC:
 1852                 if (d->mixer_dev != NULL) {
 1853                         PCM_ACQUIRE_QUICK(d);
 1854                         ret = mixer_ioctl_cmd(d->mixer_dev, cmd, arg, -1, td,
 1855                             MIXER_CMD_DIRECT);
 1856                         PCM_RELEASE_QUICK(d);
 1857                 } else
 1858                         ret = ENOTSUP;
 1859                 break;
 1860 
 1861         /*
 1862          * The following 3 ioctls aren't very useful at the moment.  For
 1863          * now, only a single channel is associated with a cdev (/dev/dspN
 1864          * instance), so there's only a single output routing to use (i.e.,
 1865          * the wrch bound to this cdev).
 1866          */
 1867         case SNDCTL_DSP_GET_PLAYTGT_NAMES:
 1868                 {
 1869                         oss_mixer_enuminfo *ei;
 1870                         ei = (oss_mixer_enuminfo *)arg;
 1871                         ei->dev = 0;
 1872                         ei->ctrl = 0;
 1873                         ei->version = 0; /* static for now */
 1874                         ei->strindex[0] = 0;
 1875 
 1876                         if (wrch != NULL) {
 1877                                 ei->nvalues = 1;
 1878                                 strlcpy(ei->strings, wrch->name,
 1879                                         sizeof(ei->strings));
 1880                         } else {
 1881                                 ei->nvalues = 0;
 1882                                 ei->strings[0] = '\0';
 1883                         }
 1884                 }
 1885                 break;
 1886         case SNDCTL_DSP_GET_PLAYTGT:
 1887         case SNDCTL_DSP_SET_PLAYTGT:    /* yes, they are the same for now */
 1888                 /*
 1889                  * Re: SET_PLAYTGT
 1890                  *   OSSv4: "The value that was accepted by the device will
 1891                  *   be returned back in the variable pointed by the
 1892                  *   argument."
 1893                  */
 1894                 if (wrch != NULL)
 1895                         *arg_i = 0;
 1896                 else
 1897                         ret = EINVAL;
 1898                 break;
 1899 
 1900         case SNDCTL_DSP_SILENCE:
 1901         /*
 1902          * Flush the software (pre-feed) buffer, but try to minimize playback
 1903          * interruption.  (I.e., record unplayed samples with intent to
 1904          * restore by SNDCTL_DSP_SKIP.) Intended for application "pause"
 1905          * functionality.
 1906          */
 1907                 if (wrch == NULL)
 1908                         ret = EINVAL;
 1909                 else {
 1910                         struct snd_dbuf *bs;
 1911                         CHN_LOCK(wrch);
 1912                         while (wrch->inprog != 0)
 1913                                 cv_wait(&wrch->cv, wrch->lock);
 1914                         bs = wrch->bufsoft;
 1915                         if ((bs->shadbuf != NULL) && (sndbuf_getready(bs) > 0)) {
 1916                                 bs->sl = sndbuf_getready(bs);
 1917                                 sndbuf_dispose(bs, bs->shadbuf, sndbuf_getready(bs));
 1918                                 sndbuf_fillsilence(bs);
 1919                                 chn_start(wrch, 0);
 1920                         }
 1921                         CHN_UNLOCK(wrch);
 1922                 }
 1923                 break;
 1924 
 1925         case SNDCTL_DSP_SKIP:
 1926         /*
 1927          * OSSv4 docs: "This ioctl call discards all unplayed samples in the
 1928          * playback buffer by moving the current write position immediately
 1929          * before the point where the device is currently reading the samples."
 1930          */
 1931                 if (wrch == NULL)
 1932                         ret = EINVAL;
 1933                 else {
 1934                         struct snd_dbuf *bs;
 1935                         CHN_LOCK(wrch);
 1936                         while (wrch->inprog != 0)
 1937                                 cv_wait(&wrch->cv, wrch->lock);
 1938                         bs = wrch->bufsoft;
 1939                         if ((bs->shadbuf != NULL) && (bs->sl > 0)) {
 1940                                 sndbuf_softreset(bs);
 1941                                 sndbuf_acquire(bs, bs->shadbuf, bs->sl);
 1942                                 bs->sl = 0;
 1943                                 chn_start(wrch, 0);
 1944                         }
 1945                         CHN_UNLOCK(wrch);
 1946                 }
 1947                 break;
 1948 
 1949         case SNDCTL_DSP_CURRENT_OPTR:
 1950         case SNDCTL_DSP_CURRENT_IPTR:
 1951         /**
 1952          * @note Changing formats resets the buffer counters, which differs
 1953          *       from the 4Front drivers.  However, I don't expect this to be
 1954          *       much of a problem.
 1955          *
 1956          * @note In a test where @c CURRENT_OPTR is called immediately after write
 1957          *       returns, this driver is about 32K samples behind whereas
 1958          *       4Front's is about 8K samples behind.  Should determine source
 1959          *       of discrepancy, even if only out of curiosity.
 1960          *
 1961          * @todo Actually test SNDCTL_DSP_CURRENT_IPTR.
 1962          */
 1963                 chn = (cmd == SNDCTL_DSP_CURRENT_OPTR) ? wrch : rdch;
 1964                 if (chn == NULL) 
 1965                         ret = EINVAL;
 1966                 else {
 1967                         struct snd_dbuf *bs;
 1968                         /* int tmp; */
 1969 
 1970                         oss_count_t *oc = (oss_count_t *)arg;
 1971 
 1972                         CHN_LOCK(chn);
 1973                         bs = chn->bufsoft;
 1974 #if 0
 1975                         tmp = (sndbuf_getsize(b) + chn_getptr(chn) - sndbuf_gethwptr(b)) % sndbuf_getsize(b);
 1976                         oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
 1977                         oc->fifo_samples = (sndbuf_getready(b) - tmp) / sndbuf_getalign(b);
 1978 #else
 1979                         oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);
 1980                         oc->fifo_samples = sndbuf_getready(bs) / sndbuf_getalign(bs);
 1981 #endif
 1982                         CHN_UNLOCK(chn);
 1983                 }
 1984                 break;
 1985 
 1986         case SNDCTL_DSP_HALT_OUTPUT:
 1987         case SNDCTL_DSP_HALT_INPUT:
 1988                 chn = (cmd == SNDCTL_DSP_HALT_OUTPUT) ? wrch : rdch;
 1989                 if (chn == NULL)
 1990                         ret = EINVAL;
 1991                 else {
 1992                         CHN_LOCK(chn);
 1993                         chn_abort(chn);
 1994                         CHN_UNLOCK(chn);
 1995                 }
 1996                 break;
 1997 
 1998         case SNDCTL_DSP_LOW_WATER:
 1999         /*
 2000          * Set the number of bytes required to attract attention by
 2001          * select/poll.
 2002          */
 2003                 if (wrch != NULL) {
 2004                         CHN_LOCK(wrch);
 2005                         wrch->lw = (*arg_i > 1) ? *arg_i : 1;
 2006                         CHN_UNLOCK(wrch);
 2007                 }
 2008                 if (rdch != NULL) {
 2009                         CHN_LOCK(rdch);
 2010                         rdch->lw = (*arg_i > 1) ? *arg_i : 1;
 2011                         CHN_UNLOCK(rdch);
 2012                 }
 2013                 break;
 2014 
 2015         case SNDCTL_DSP_GETERROR:
 2016         /*
 2017          * OSSv4 docs:  "All errors and counters will automatically be
 2018          * cleared to zeroes after the call so each call will return only
 2019          * the errors that occurred after the previous invocation. ... The
 2020          * play_underruns and rec_overrun fields are the only useful fields
 2021          * returned by OSS 4.0."
 2022          */
 2023                 {
 2024                         audio_errinfo *ei = (audio_errinfo *)arg;
 2025 
 2026                         bzero((void *)ei, sizeof(*ei));
 2027 
 2028                         if (wrch != NULL) {
 2029                                 CHN_LOCK(wrch);
 2030                                 ei->play_underruns = wrch->xruns;
 2031                                 wrch->xruns = 0;
 2032                                 CHN_UNLOCK(wrch);
 2033                         }
 2034                         if (rdch != NULL) {
 2035                                 CHN_LOCK(rdch);
 2036                                 ei->rec_overruns = rdch->xruns;
 2037                                 rdch->xruns = 0;
 2038                                 CHN_UNLOCK(rdch);
 2039                         }
 2040                 }
 2041                 break;
 2042 
 2043         case SNDCTL_DSP_SYNCGROUP:
 2044                 PCM_ACQUIRE_QUICK(d);
 2045                 ret = dsp_oss_syncgroup(wrch, rdch, (oss_syncgroup *)arg);
 2046                 PCM_RELEASE_QUICK(d);
 2047                 break;
 2048 
 2049         case SNDCTL_DSP_SYNCSTART:
 2050                 PCM_ACQUIRE_QUICK(d);
 2051                 ret = dsp_oss_syncstart(*arg_i);
 2052                 PCM_RELEASE_QUICK(d);
 2053                 break;
 2054 
 2055         case SNDCTL_DSP_POLICY:
 2056                 PCM_ACQUIRE_QUICK(d);
 2057                 ret = dsp_oss_policy(wrch, rdch, *arg_i);
 2058                 PCM_RELEASE_QUICK(d);
 2059                 break;
 2060 
 2061         case SNDCTL_DSP_COOKEDMODE:
 2062                 PCM_ACQUIRE_QUICK(d);
 2063                 if (!(dsp_get_flags(i_dev) & SD_F_BITPERFECT))
 2064                         ret = dsp_oss_cookedmode(wrch, rdch, *arg_i);
 2065                 PCM_RELEASE_QUICK(d);
 2066                 break;
 2067         case SNDCTL_DSP_GET_CHNORDER:
 2068                 PCM_ACQUIRE_QUICK(d);
 2069                 ret = dsp_oss_getchnorder(wrch, rdch, (unsigned long long *)arg);
 2070                 PCM_RELEASE_QUICK(d);
 2071                 break;
 2072         case SNDCTL_DSP_SET_CHNORDER:
 2073                 PCM_ACQUIRE_QUICK(d);
 2074                 ret = dsp_oss_setchnorder(wrch, rdch, (unsigned long long *)arg);
 2075                 PCM_RELEASE_QUICK(d);
 2076                 break;
 2077         case SNDCTL_DSP_GETCHANNELMASK:         /* XXX vlc */
 2078                 PCM_ACQUIRE_QUICK(d);
 2079                 ret = dsp_oss_getchannelmask(wrch, rdch, (int *)arg);
 2080                 PCM_RELEASE_QUICK(d);
 2081                 break;
 2082         case SNDCTL_DSP_BIND_CHANNEL:           /* XXX what?!? */
 2083                 ret = EINVAL;
 2084                 break;
 2085 #ifdef  OSSV4_EXPERIMENT
 2086         /*
 2087          * XXX The following ioctls are not yet supported and just return
 2088          * EINVAL.
 2089          */
 2090         case SNDCTL_DSP_GETOPEAKS:
 2091         case SNDCTL_DSP_GETIPEAKS:
 2092                 chn = (cmd == SNDCTL_DSP_GETOPEAKS) ? wrch : rdch;
 2093                 if (chn == NULL)
 2094                         ret = EINVAL;
 2095                 else {
 2096                         oss_peaks_t *op = (oss_peaks_t *)arg;
 2097                         int lpeak, rpeak;
 2098 
 2099                         CHN_LOCK(chn);
 2100                         ret = chn_getpeaks(chn, &lpeak, &rpeak);
 2101                         if (ret == -1)
 2102                                 ret = EINVAL;
 2103                         else {
 2104                                 (*op)[0] = lpeak;
 2105                                 (*op)[1] = rpeak;
 2106                         }
 2107                         CHN_UNLOCK(chn);
 2108                 }
 2109                 break;
 2110 
 2111         /*
 2112          * XXX Once implemented, revisit this for proper cv protection
 2113          *     (if necessary).
 2114          */
 2115         case SNDCTL_GETLABEL:
 2116                 ret = dsp_oss_getlabel(wrch, rdch, (oss_label_t *)arg);
 2117                 break;
 2118         case SNDCTL_SETLABEL:
 2119                 ret = dsp_oss_setlabel(wrch, rdch, (oss_label_t *)arg);
 2120                 break;
 2121         case SNDCTL_GETSONG:
 2122                 ret = dsp_oss_getsong(wrch, rdch, (oss_longname_t *)arg);
 2123                 break;
 2124         case SNDCTL_SETSONG:
 2125                 ret = dsp_oss_setsong(wrch, rdch, (oss_longname_t *)arg);
 2126                 break;
 2127         case SNDCTL_SETNAME:
 2128                 ret = dsp_oss_setname(wrch, rdch, (oss_longname_t *)arg);
 2129                 break;
 2130 #if 0
 2131         /**
 2132          * @note The S/PDIF interface ioctls, @c SNDCTL_DSP_READCTL and
 2133          * @c SNDCTL_DSP_WRITECTL have been omitted at the suggestion of
 2134          * 4Front Technologies.
 2135          */
 2136         case SNDCTL_DSP_READCTL:
 2137         case SNDCTL_DSP_WRITECTL:
 2138                 ret = EINVAL;
 2139                 break;
 2140 #endif  /* !0 (explicitly omitted ioctls) */
 2141 
 2142 #endif  /* !OSSV4_EXPERIMENT */
 2143         case SNDCTL_DSP_MAPINBUF:
 2144         case SNDCTL_DSP_MAPOUTBUF:
 2145         case SNDCTL_DSP_SETSYNCRO:
 2146                 /* undocumented */
 2147 
 2148         case SNDCTL_DSP_SUBDIVIDE:
 2149         case SOUND_PCM_WRITE_FILTER:
 2150         case SOUND_PCM_READ_FILTER:
 2151                 /* dunno what these do, don't sound important */
 2152 
 2153         default:
 2154                 DEB(printf("default ioctl fn 0x%08lx fail\n", cmd));
 2155                 ret = EINVAL;
 2156                 break;
 2157         }
 2158 
 2159         PCM_GIANT_LEAVE(d);
 2160 
 2161         return (ret);
 2162 }
 2163 
 2164 static int
 2165 dsp_poll(struct cdev *i_dev, int events, struct thread *td)
 2166 {
 2167         struct snddev_info *d;
 2168         struct pcm_channel *wrch, *rdch;
 2169         int ret, e;
 2170 
 2171         d = dsp_get_info(i_dev);
 2172         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev)) {
 2173                 /* XXX many clients don't understand POLLNVAL */
 2174                 return (events & (POLLHUP | POLLPRI | POLLIN |
 2175                     POLLRDNORM | POLLOUT | POLLWRNORM));
 2176         }
 2177         PCM_GIANT_ENTER(d);
 2178 
 2179         wrch = NULL;
 2180         rdch = NULL;
 2181         ret = 0;
 2182 
 2183         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2184 
 2185         if (wrch != NULL && !(wrch->flags & CHN_F_DEAD)) {
 2186                 e = (events & (POLLOUT | POLLWRNORM));
 2187                 if (e)
 2188                         ret |= chn_poll(wrch, e, td);
 2189         }
 2190 
 2191         if (rdch != NULL && !(rdch->flags & CHN_F_DEAD)) {
 2192                 e = (events & (POLLIN | POLLRDNORM));
 2193                 if (e)
 2194                         ret |= chn_poll(rdch, e, td);
 2195         }
 2196 
 2197         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2198 
 2199         PCM_GIANT_LEAVE(d);
 2200 
 2201         return (ret);
 2202 }
 2203 
 2204 static int
 2205 dsp_mmap(struct cdev *i_dev, vm_ooffset_t offset, vm_paddr_t *paddr,
 2206     int nprot, vm_memattr_t *memattr)
 2207 {
 2208 
 2209         /* XXX memattr is not honored */
 2210         *paddr = vtophys(offset);
 2211         return (0);
 2212 }
 2213 
 2214 static int
 2215 dsp_mmap_single(struct cdev *i_dev, vm_ooffset_t *offset,
 2216     vm_size_t size, struct vm_object **object, int nprot)
 2217 {
 2218         struct snddev_info *d;
 2219         struct pcm_channel *wrch, *rdch, *c;
 2220 
 2221         /*
 2222          * Reject PROT_EXEC by default. It just doesn't makes sense.
 2223          * Unfortunately, we have to give up this one due to linux_mmap
 2224          * changes.
 2225          *
 2226          * http://lists.freebsd.org/pipermail/freebsd-emulation/2007-June/003698.html
 2227          *
 2228          */
 2229 #ifdef SV_ABI_LINUX
 2230         if ((nprot & PROT_EXEC) && (dsp_mmap_allow_prot_exec < 0 ||
 2231             (dsp_mmap_allow_prot_exec == 0 &&
 2232             SV_CURPROC_ABI() != SV_ABI_LINUX)))
 2233 #else
 2234         if ((nprot & PROT_EXEC) && dsp_mmap_allow_prot_exec < 1)
 2235 #endif
 2236                 return (EINVAL);
 2237 
 2238         /*
 2239          * PROT_READ (alone) selects the input buffer.
 2240          * PROT_WRITE (alone) selects the output buffer.
 2241          * PROT_WRITE|PROT_READ together select the output buffer.
 2242          */
 2243         if ((nprot & (PROT_READ | PROT_WRITE)) == 0)
 2244                 return (EINVAL);
 2245 
 2246         d = dsp_get_info(i_dev);
 2247         if (PCM_DETACHING(d) || !DSP_REGISTERED(d, i_dev))
 2248                 return (EINVAL);
 2249 
 2250         PCM_GIANT_ENTER(d);
 2251 
 2252         getchns(i_dev, &rdch, &wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2253 
 2254         c = ((nprot & PROT_WRITE) != 0) ? wrch : rdch;
 2255         if (c == NULL || (c->flags & CHN_F_MMAP_INVALID) ||
 2256             (*offset  + size) > sndbuf_getsize(c->bufsoft) ||
 2257             (wrch != NULL && (wrch->flags & CHN_F_MMAP_INVALID)) ||
 2258             (rdch != NULL && (rdch->flags & CHN_F_MMAP_INVALID))) {
 2259                 relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2260                 PCM_GIANT_EXIT(d);
 2261                 return (EINVAL);
 2262         }
 2263 
 2264         if (wrch != NULL)
 2265                 wrch->flags |= CHN_F_MMAP;
 2266         if (rdch != NULL)
 2267                 rdch->flags |= CHN_F_MMAP;
 2268 
 2269         *offset = (uintptr_t)sndbuf_getbufofs(c->bufsoft, *offset);
 2270         relchns(i_dev, rdch, wrch, SD_F_PRIO_RD | SD_F_PRIO_WR);
 2271         *object = vm_pager_allocate(OBJT_DEVICE, i_dev,
 2272             size, nprot, *offset, curthread->td_ucred);
 2273 
 2274         PCM_GIANT_LEAVE(d);
 2275 
 2276         if (*object == NULL)
 2277                  return (EINVAL);
 2278         return (0);
 2279 }
 2280 
 2281 /* So much for dev_stdclone() */
 2282 static int
 2283 dsp_stdclone(char *name, char *namep, char *sep, int use_sep, int *u, int *c)
 2284 {
 2285         size_t len;
 2286 
 2287         len = strlen(namep);
 2288 
 2289         if (bcmp(name, namep, len) != 0)
 2290                 return (ENODEV);
 2291 
 2292         name += len;
 2293 
 2294         if (isdigit(*name) == 0)
 2295                 return (ENODEV);
 2296 
 2297         len = strlen(sep);
 2298 
 2299         if (*name == '' && !(name[1] == '\0' || bcmp(name + 1, sep, len) == 0))
 2300                 return (ENODEV);
 2301 
 2302         for (*u = 0; isdigit(*name) != 0; name++) {
 2303                 *u *= 10;
 2304                 *u += *name - '';
 2305                 if (*u > dsp_umax)
 2306                         return (ENODEV);
 2307         }
 2308 
 2309         if (*name == '\0')
 2310                 return ((use_sep == 0) ? 0 : ENODEV);
 2311 
 2312         if (bcmp(name, sep, len) != 0 || isdigit(name[len]) == 0)
 2313                 return (ENODEV);
 2314 
 2315         name += len;
 2316 
 2317         if (*name == '' && name[1] != '\0')
 2318                 return (ENODEV);
 2319 
 2320         for (*c = 0; isdigit(*name) != 0; name++) {
 2321                 *c *= 10;
 2322                 *c += *name - '';
 2323                 if (*c > dsp_cmax)
 2324                         return (ENODEV);
 2325         }
 2326 
 2327         if (*name != '\0')
 2328                 return (ENODEV);
 2329 
 2330         return (0);
 2331 }
 2332 
 2333 static void
 2334 dsp_clone(void *arg,
 2335 #if __FreeBSD_version >= 600034
 2336     struct ucred *cred,
 2337 #endif
 2338     char *name, int namelen, struct cdev **dev)
 2339 {
 2340         struct snddev_info *d;
 2341         struct snd_clone_entry *ce;
 2342         struct pcm_channel *c;
 2343         int i, unit, udcmask, cunit, devtype, devhw, devcmax, tumax;
 2344         char *devname, *devcmp, *devsep;
 2345 
 2346         KASSERT(dsp_umax >= 0 && dsp_cmax >= 0, ("Uninitialized unit!"));
 2347 
 2348         if (*dev != NULL)
 2349                 return;
 2350 
 2351         unit = -1;
 2352         cunit = -1;
 2353         devtype = -1;
 2354         devhw = 0;
 2355         devcmax = -1;
 2356         tumax = -1;
 2357         devname = NULL;
 2358         devsep = NULL;
 2359 
 2360         for (i = 0; unit == -1 &&
 2361             i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2362                 devtype = dsp_cdevs[i].type;
 2363                 devcmp = dsp_cdevs[i].name;
 2364                 devsep = dsp_cdevs[i].sep;
 2365                 devname = dsp_cdevs[i].alias;
 2366                 if (devname == NULL)
 2367                         devname = devcmp;
 2368                 devhw = dsp_cdevs[i].hw;
 2369                 devcmax = dsp_cdevs[i].max - 1;
 2370                 if (strcmp(name, devcmp) == 0) {
 2371                         if (dsp_basename_clone != 0)
 2372                                 unit = snd_unit;
 2373                 } else if (dsp_stdclone(name, devcmp, devsep,
 2374                     dsp_cdevs[i].use_sep, &unit, &cunit) != 0) {
 2375                         unit = -1;
 2376                         cunit = -1;
 2377                 }
 2378         }
 2379 
 2380         d = devclass_get_softc(pcm_devclass, unit);
 2381         if (!PCM_REGISTERED(d) || d->clones == NULL)
 2382                 return;
 2383 
 2384         /* XXX Need Giant magic entry ??? */
 2385 
 2386         PCM_LOCK(d);
 2387         if (snd_clone_disabled(d->clones)) {
 2388                 PCM_UNLOCK(d);
 2389                 return;
 2390         }
 2391 
 2392         PCM_WAIT(d);
 2393         PCM_ACQUIRE(d);
 2394         PCM_UNLOCK(d);
 2395 
 2396         udcmask = snd_u2unit(unit) | snd_d2unit(devtype);
 2397 
 2398         if (devhw != 0) {
 2399                 KASSERT(devcmax <= dsp_cmax,
 2400                     ("overflow: devcmax=%d, dsp_cmax=%d", devcmax, dsp_cmax));
 2401                 if (cunit > devcmax) {
 2402                         PCM_RELEASE_QUICK(d);
 2403                         return;
 2404                 }
 2405                 udcmask |= snd_c2unit(cunit);
 2406                 CHN_FOREACH(c, d, channels.pcm) {
 2407                         CHN_LOCK(c);
 2408                         if (c->unit != udcmask) {
 2409                                 CHN_UNLOCK(c);
 2410                                 continue;
 2411                         }
 2412                         CHN_UNLOCK(c);
 2413                         udcmask &= ~snd_c2unit(cunit);
 2414                         /*
 2415                          * Temporarily increase clone maxunit to overcome
 2416                          * vchan flexibility.
 2417                          *
 2418                          * # sysctl dev.pcm.0.play.vchans=256
 2419                          * dev.pcm.0.play.vchans: 1 -> 256
 2420                          * # cat /dev/zero > /dev/dsp0.vp255 &
 2421                          * [1] 17296
 2422                          * # sysctl dev.pcm.0.play.vchans=0
 2423                          * dev.pcm.0.play.vchans: 256 -> 1
 2424                          * # fg
 2425                          * [1]  + running    cat /dev/zero > /dev/dsp0.vp255
 2426                          * ^C
 2427                          * # cat /dev/zero > /dev/dsp0.vp255
 2428                          * zsh: operation not supported: /dev/dsp0.vp255
 2429                          */
 2430                         tumax = snd_clone_getmaxunit(d->clones);
 2431                         if (cunit > tumax)
 2432                                 snd_clone_setmaxunit(d->clones, cunit);
 2433                         else
 2434                                 tumax = -1;
 2435                         goto dsp_clone_alloc;
 2436                 }
 2437                 /*
 2438                  * Ok, so we're requesting unallocated vchan, but still
 2439                  * within maximum vchan limit.
 2440                  */
 2441                 if (((devtype == SND_DEV_DSPHW_VPLAY && d->pvchancount > 0) ||
 2442                     (devtype == SND_DEV_DSPHW_VREC && d->rvchancount > 0)) &&
 2443                     cunit < snd_maxautovchans) {
 2444                         udcmask &= ~snd_c2unit(cunit);
 2445                         tumax = snd_clone_getmaxunit(d->clones);
 2446                         if (cunit > tumax)
 2447                                 snd_clone_setmaxunit(d->clones, cunit);
 2448                         else
 2449                                 tumax = -1;
 2450                         goto dsp_clone_alloc;
 2451                 }
 2452                 PCM_RELEASE_QUICK(d);
 2453                 return;
 2454         }
 2455 
 2456 dsp_clone_alloc:
 2457         ce = snd_clone_alloc(d->clones, dev, &cunit, udcmask);
 2458         if (tumax != -1)
 2459                 snd_clone_setmaxunit(d->clones, tumax);
 2460         if (ce != NULL) {
 2461                 udcmask |= snd_c2unit(cunit);
 2462                 *dev = make_dev(&dsp_cdevsw, PCMMINOR(udcmask),
 2463                     UID_ROOT, GID_WHEEL, 0666, "%s%d%s%d",
 2464                     devname, unit, devsep, cunit);
 2465                 snd_clone_register(ce, *dev);
 2466         }
 2467 
 2468         PCM_RELEASE_QUICK(d);
 2469 
 2470         if (*dev != NULL)
 2471                 dev_ref(*dev);
 2472 }
 2473 
 2474 static void
 2475 dsp_sysinit(void *p)
 2476 {
 2477         if (dsp_ehtag != NULL)
 2478                 return;
 2479         /* initialize unit numbering */
 2480         snd_unit_init();
 2481         dsp_umax = PCMMAXUNIT;
 2482         dsp_cmax = PCMMAXCHAN;
 2483         dsp_ehtag = EVENTHANDLER_REGISTER(dev_clone, dsp_clone, 0, 1000);
 2484 }
 2485 
 2486 static void
 2487 dsp_sysuninit(void *p)
 2488 {
 2489         if (dsp_ehtag == NULL)
 2490                 return;
 2491         EVENTHANDLER_DEREGISTER(dev_clone, dsp_ehtag);
 2492         dsp_ehtag = NULL;
 2493 }
 2494 
 2495 SYSINIT(dsp_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysinit, NULL);
 2496 SYSUNINIT(dsp_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, dsp_sysuninit, NULL);
 2497 
 2498 char *
 2499 dsp_unit2name(char *buf, size_t len, int unit)
 2500 {
 2501         int i, dtype;
 2502 
 2503         KASSERT(buf != NULL && len != 0,
 2504             ("bogus buf=%p len=%ju", buf, (uintmax_t)len));
 2505 
 2506         dtype = snd_unit2d(unit);
 2507 
 2508         for (i = 0; i < (sizeof(dsp_cdevs) / sizeof(dsp_cdevs[0])); i++) {
 2509                 if (dtype != dsp_cdevs[i].type || dsp_cdevs[i].alias != NULL)
 2510                         continue;
 2511                 snprintf(buf, len, "%s%d%s%d", dsp_cdevs[i].name,
 2512                     snd_unit2u(unit), dsp_cdevs[i].sep, snd_unit2c(unit));
 2513                 return (buf);
 2514         }
 2515 
 2516         return (NULL);
 2517 }
 2518 
 2519 /**
 2520  * @brief Handler for SNDCTL_AUDIOINFO.
 2521  *
 2522  * Gathers information about the audio device specified in ai->dev.  If
 2523  * ai->dev == -1, then this function gathers information about the current
 2524  * device.  If the call comes in on a non-audio device and ai->dev == -1,
 2525  * return EINVAL.
 2526  *
 2527  * This routine is supposed to go practically straight to the hardware,
 2528  * getting capabilities directly from the sound card driver, side-stepping
 2529  * the intermediate channel interface.
 2530  *
 2531  * Note, however, that the usefulness of this command is significantly
 2532  * decreased when requesting info about any device other than the one serving
 2533  * the request. While each snddev_channel refers to a specific device node,
 2534  * the converse is *not* true.  Currently, when a sound device node is opened,
 2535  * the sound subsystem scans for an available audio channel (or channels, if
 2536  * opened in read+write) and then assigns them to the si_drv[12] private
 2537  * data fields.  As a result, any information returned linking a channel to
 2538  * a specific character device isn't necessarily accurate.
 2539  *
 2540  * @note
 2541  * Calling threads must not hold any snddev_info or pcm_channel locks.
 2542  * 
 2543  * @param dev           device on which the ioctl was issued
 2544  * @param ai            ioctl request data container
 2545  *
 2546  * @retval 0            success
 2547  * @retval EINVAL       ai->dev specifies an invalid device
 2548  *
 2549  * @todo Verify correctness of Doxygen tags.  ;)
 2550  */
 2551 int
 2552 dsp_oss_audioinfo(struct cdev *i_dev, oss_audioinfo *ai)
 2553 {
 2554         struct pcmchan_caps *caps;
 2555         struct pcm_channel *ch;
 2556         struct snddev_info *d;
 2557         uint32_t fmts;
 2558         int i, nchan, *rates, minch, maxch;
 2559         char *devname, buf[CHN_NAMELEN];
 2560 
 2561         /*
 2562          * If probing the device that received the ioctl, make sure it's a
 2563          * DSP device.  (Users may use this ioctl with /dev/mixer and
 2564          * /dev/midi.)
 2565          */
 2566         if (ai->dev == -1 && i_dev->si_devsw != &dsp_cdevsw)
 2567                 return (EINVAL);
 2568 
 2569         ch = NULL;
 2570         devname = NULL;
 2571         nchan = 0;
 2572         bzero(buf, sizeof(buf));
 2573 
 2574         /*
 2575          * Search for the requested audio device (channel).  Start by
 2576          * iterating over pcm devices.
 2577          */ 
 2578         for (i = 0; pcm_devclass != NULL &&
 2579             i < devclass_get_maxunit(pcm_devclass); i++) {
 2580                 d = devclass_get_softc(pcm_devclass, i);
 2581                 if (!PCM_REGISTERED(d))
 2582                         continue;
 2583 
 2584                 /* XXX Need Giant magic entry ??? */
 2585 
 2586                 /* See the note in function docblock */
 2587                 PCM_UNLOCKASSERT(d);
 2588                 PCM_LOCK(d);
 2589 
 2590                 CHN_FOREACH(ch, d, channels.pcm) {
 2591                         CHN_UNLOCKASSERT(ch);
 2592                         CHN_LOCK(ch);
 2593                         if (ai->dev == -1) {
 2594                                 if (DSP_REGISTERED(d, i_dev) &&
 2595                                     (ch == PCM_RDCH(i_dev) ||   /* record ch */
 2596                                     ch == PCM_WRCH(i_dev))) {   /* playback ch */
 2597                                         devname = dsp_unit2name(buf,
 2598                                             sizeof(buf), ch->unit);
 2599                                 }
 2600                         } else if (ai->dev == nchan) {
 2601                                 devname = dsp_unit2name(buf, sizeof(buf),
 2602                                     ch->unit);
 2603                         }
 2604                         if (devname != NULL)
 2605                                 break;
 2606                         CHN_UNLOCK(ch);
 2607                         ++nchan;
 2608                 }
 2609 
 2610                 if (devname != NULL) {
 2611                         /*
 2612                          * At this point, the following synchronization stuff
 2613                          * has happened:
 2614                          * - a specific PCM device is locked.
 2615                          * - a specific audio channel has been locked, so be
 2616                          *   sure to unlock when exiting;
 2617                          */
 2618 
 2619                         caps = chn_getcaps(ch);
 2620 
 2621                         /*
 2622                          * With all handles collected, zero out the user's
 2623                          * container and begin filling in its fields.
 2624                          */
 2625                         bzero((void *)ai, sizeof(oss_audioinfo));
 2626 
 2627                         ai->dev = nchan;
 2628                         strlcpy(ai->name, ch->name,  sizeof(ai->name));
 2629 
 2630                         if ((ch->flags & CHN_F_BUSY) == 0)
 2631                                 ai->busy = 0;
 2632                         else
 2633                                 ai->busy = (ch->direction == PCMDIR_PLAY) ? OPEN_WRITE : OPEN_READ;
 2634 
 2635                         /**
 2636                          * @note
 2637                          * @c cmd - OSSv4 docs: "Only supported under Linux at
 2638                          *    this moment." Cop-out, I know, but I'll save
 2639                          *    running around in the process table for later.
 2640                          *    Is there a risk of leaking information?
 2641                          */
 2642                         ai->pid = ch->pid;
 2643 
 2644                         /*
 2645                          * These flags stolen from SNDCTL_DSP_GETCAPS handler.
 2646                          * Note, however, that a single channel operates in
 2647                          * only one direction, so PCM_CAP_DUPLEX is out.
 2648                          */
 2649                         /**
 2650                          * @todo @c SNDCTL_AUDIOINFO::caps - Make drivers keep
 2651                          *       these in pcmchan::caps?
 2652                          */
 2653                         ai->caps = PCM_CAP_REALTIME | PCM_CAP_MMAP | PCM_CAP_TRIGGER |
 2654                             ((ch->direction == PCMDIR_PLAY) ? PCM_CAP_OUTPUT : PCM_CAP_INPUT);
 2655 
 2656                         /*
 2657                          * Collect formats supported @b natively by the
 2658                          * device.  Also determine min/max channels.  (I.e.,
 2659                          * mono, stereo, or both?)
 2660                          *
 2661                          * If any channel is stereo, maxch = 2;
 2662                          * if all channels are stereo, minch = 2, too;
 2663                          * if any channel is mono, minch = 1;
 2664                          * and if all channels are mono, maxch = 1.
 2665                          */
 2666                         minch = 0;
 2667                         maxch = 0;
 2668                         fmts = 0;
 2669                         for (i = 0; caps->fmtlist[i]; i++) {
 2670                                 fmts |= caps->fmtlist[i];
 2671                                 if (AFMT_CHANNEL(caps->fmtlist[i]) > 1) {
 2672                                         minch = (minch == 0) ? 2 : minch;
 2673                                         maxch = 2;
 2674                                 } else {
 2675                                         minch = 1;
 2676                                         maxch = (maxch == 0) ? 1 : maxch;
 2677                                 }
 2678                         }
 2679 
 2680                         if (ch->direction == PCMDIR_PLAY)
 2681                                 ai->oformats = fmts;
 2682                         else
 2683                                 ai->iformats = fmts;
 2684 
 2685                         /**
 2686                          * @note
 2687                          * @c magic - OSSv4 docs: "Reserved for internal use
 2688                          *    by OSS."
 2689                          *
 2690                          * @par
 2691                          * @c card_number - OSSv4 docs: "Number of the sound
 2692                          *    card where this device belongs or -1 if this
 2693                          *    information is not available.  Applications
 2694                          *    should normally not use this field for any
 2695                          *    purpose."
 2696                          */
 2697                         ai->card_number = -1;
 2698                         /**
 2699                          * @todo @c song_name - depends first on
 2700                          *          SNDCTL_[GS]ETSONG @todo @c label - depends
 2701                          *          on SNDCTL_[GS]ETLABEL
 2702                          * @todo @c port_number - routing information?
 2703                          */
 2704                         ai->port_number = -1;
 2705                         ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
 2706                         /**
 2707                          * @note
 2708                          * @c real_device - OSSv4 docs:  "Obsolete."
 2709                          */
 2710                         ai->real_device = -1;
 2711                         strlcpy(ai->devnode, "/dev/", sizeof(ai->devnode));
 2712                         strlcat(ai->devnode, devname, sizeof(ai->devnode));
 2713                         ai->enabled = device_is_attached(d->dev) ? 1 : 0;
 2714                         /**
 2715                          * @note
 2716                          * @c flags - OSSv4 docs: "Reserved for future use."
 2717                          *
 2718                          * @note
 2719                          * @c binding - OSSv4 docs: "Reserved for future use."
 2720                          *
 2721                          * @todo @c handle - haven't decided how to generate
 2722                          *       this yet; bus, vendor, device IDs?
 2723                          */
 2724                         ai->min_rate = caps->minspeed;
 2725                         ai->max_rate = caps->maxspeed;
 2726 
 2727                         ai->min_channels = minch;
 2728                         ai->max_channels = maxch;
 2729 
 2730                         ai->nrates = chn_getrates(ch, &rates);
 2731                         if (ai->nrates > OSS_MAX_SAMPLE_RATES)
 2732                                 ai->nrates = OSS_MAX_SAMPLE_RATES;
 2733 
 2734                         for (i = 0; i < ai->nrates; i++)
 2735                                 ai->rates[i] = rates[i];
 2736                         
 2737                         ai->next_play_engine = 0;
 2738                         ai->next_rec_engine = 0;
 2739 
 2740                         CHN_UNLOCK(ch);
 2741                 }
 2742 
 2743                 PCM_UNLOCK(d);
 2744 
 2745                 if (devname != NULL)
 2746                         return (0);
 2747         }
 2748 
 2749         /* Exhausted the search -- nothing is locked, so return. */
 2750         return (EINVAL);
 2751 }
 2752 
 2753 /**
 2754  * @brief Assigns a PCM channel to a sync group.
 2755  *
 2756  * Sync groups are used to enable audio operations on multiple devices
 2757  * simultaneously.  They may be used with any number of devices and may
 2758  * span across applications.  Devices are added to groups with
 2759  * the SNDCTL_DSP_SYNCGROUP ioctl, and operations are triggered with the
 2760  * SNDCTL_DSP_SYNCSTART ioctl.
 2761  *
 2762  * If the @c id field of the @c group parameter is set to zero, then a new
 2763  * sync group is created.  Otherwise, wrch and rdch (if set) are added to
 2764  * the group specified.
 2765  *
 2766  * @todo As far as memory allocation, should we assume that things are
 2767  *       okay and allocate with M_WAITOK before acquiring channel locks,
 2768  *       freeing later if not?
 2769  *
 2770  * @param wrch  output channel associated w/ device (if any)
 2771  * @param rdch  input channel associated w/ device (if any)
 2772  * @param group Sync group parameters
 2773  *
 2774  * @retval 0            success
 2775  * @retval non-zero     error to be propagated upstream
 2776  */
 2777 static int
 2778 dsp_oss_syncgroup(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_syncgroup *group)
 2779 {
 2780         struct pcmchan_syncmember *smrd, *smwr;
 2781         struct pcmchan_syncgroup *sg;
 2782         int ret, sg_ids[3];
 2783 
 2784         smrd = NULL;
 2785         smwr = NULL;
 2786         sg = NULL;
 2787         ret = 0;
 2788 
 2789         /*
 2790          * Free_unr() may sleep, so store released syncgroup IDs until after
 2791          * all locks are released.
 2792          */
 2793         sg_ids[0] = sg_ids[1] = sg_ids[2] = 0;
 2794 
 2795         PCM_SG_LOCK();
 2796 
 2797         /*
 2798          * - Insert channel(s) into group's member list.
 2799          * - Set CHN_F_NOTRIGGER on channel(s).
 2800          * - Stop channel(s).  
 2801          */
 2802 
 2803         /*
 2804          * If device's channels are already mapped to a group, unmap them.
 2805          */
 2806         if (wrch) {
 2807                 CHN_LOCK(wrch);
 2808                 sg_ids[0] = chn_syncdestroy(wrch);
 2809         }
 2810 
 2811         if (rdch) {
 2812                 CHN_LOCK(rdch);
 2813                 sg_ids[1] = chn_syncdestroy(rdch);
 2814         }
 2815 
 2816         /*
 2817          * Verify that mode matches character device properites.
 2818          *  - Bail if PCM_ENABLE_OUTPUT && wrch == NULL.
 2819          *  - Bail if PCM_ENABLE_INPUT && rdch == NULL.
 2820          */
 2821         if (((wrch == NULL) && (group->mode & PCM_ENABLE_OUTPUT)) ||
 2822             ((rdch == NULL) && (group->mode & PCM_ENABLE_INPUT))) {
 2823                 ret = EINVAL;
 2824                 goto out;
 2825         }
 2826 
 2827         /*
 2828          * An id of zero indicates the user wants to create a new
 2829          * syncgroup.
 2830          */
 2831         if (group->id == 0) {
 2832                 sg = (struct pcmchan_syncgroup *)malloc(sizeof(*sg), M_DEVBUF, M_NOWAIT);
 2833                 if (sg != NULL) {
 2834                         SLIST_INIT(&sg->members);
 2835                         sg->id = alloc_unr(pcmsg_unrhdr);
 2836 
 2837                         group->id = sg->id;
 2838                         SLIST_INSERT_HEAD(&snd_pcm_syncgroups, sg, link);
 2839                 } else
 2840                         ret = ENOMEM;
 2841         } else {
 2842                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2843                         if (sg->id == group->id)
 2844                                 break;
 2845                 }
 2846                 if (sg == NULL)
 2847                         ret = EINVAL;
 2848         }
 2849 
 2850         /* Couldn't create or find a syncgroup.  Fail. */
 2851         if (sg == NULL)
 2852                 goto out;
 2853 
 2854         /*
 2855          * Allocate a syncmember, assign it and a channel together, and
 2856          * insert into syncgroup.
 2857          */
 2858         if (group->mode & PCM_ENABLE_INPUT) {
 2859                 smrd = (struct pcmchan_syncmember *)malloc(sizeof(*smrd), M_DEVBUF, M_NOWAIT);
 2860                 if (smrd == NULL) {
 2861                         ret = ENOMEM;
 2862                         goto out;
 2863                 }
 2864 
 2865                 SLIST_INSERT_HEAD(&sg->members, smrd, link);
 2866                 smrd->parent = sg;
 2867                 smrd->ch = rdch;
 2868 
 2869                 chn_abort(rdch);
 2870                 rdch->flags |= CHN_F_NOTRIGGER;
 2871                 rdch->sm = smrd;
 2872         }
 2873 
 2874         if (group->mode & PCM_ENABLE_OUTPUT) {
 2875                 smwr = (struct pcmchan_syncmember *)malloc(sizeof(*smwr), M_DEVBUF, M_NOWAIT);
 2876                 if (smwr == NULL) {
 2877                         ret = ENOMEM;
 2878                         goto out;
 2879                 }
 2880 
 2881                 SLIST_INSERT_HEAD(&sg->members, smwr, link);
 2882                 smwr->parent = sg;
 2883                 smwr->ch = wrch;
 2884 
 2885                 chn_abort(wrch);
 2886                 wrch->flags |= CHN_F_NOTRIGGER;
 2887                 wrch->sm = smwr;
 2888         }
 2889 
 2890 
 2891 out:
 2892         if (ret != 0) {
 2893                 if (smrd != NULL)
 2894                         free(smrd, M_DEVBUF);
 2895                 if ((sg != NULL) && SLIST_EMPTY(&sg->members)) {
 2896                         sg_ids[2] = sg->id;
 2897                         SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 2898                         free(sg, M_DEVBUF);
 2899                 }
 2900 
 2901                 if (wrch)
 2902                         wrch->sm = NULL;
 2903                 if (rdch)
 2904                         rdch->sm = NULL;
 2905         }
 2906 
 2907         if (wrch)
 2908                 CHN_UNLOCK(wrch);
 2909         if (rdch)
 2910                 CHN_UNLOCK(rdch);
 2911 
 2912         PCM_SG_UNLOCK();
 2913 
 2914         if (sg_ids[0])
 2915                 free_unr(pcmsg_unrhdr, sg_ids[0]);
 2916         if (sg_ids[1])
 2917                 free_unr(pcmsg_unrhdr, sg_ids[1]);
 2918         if (sg_ids[2])
 2919                 free_unr(pcmsg_unrhdr, sg_ids[2]);
 2920 
 2921         return (ret);
 2922 }
 2923 
 2924 /**
 2925  * @brief Launch a sync group into action
 2926  *
 2927  * Sync groups are established via SNDCTL_DSP_SYNCGROUP.  This function
 2928  * iterates over all members, triggering them along the way.
 2929  *
 2930  * @note Caller must not hold any channel locks.
 2931  *
 2932  * @param sg_id sync group identifier
 2933  *
 2934  * @retval 0    success
 2935  * @retval non-zero     error worthy of propagating upstream to user
 2936  */
 2937 static int
 2938 dsp_oss_syncstart(int sg_id)
 2939 {
 2940         struct pcmchan_syncmember *sm, *sm_tmp;
 2941         struct pcmchan_syncgroup *sg;
 2942         struct pcm_channel *c;
 2943         int ret, needlocks;
 2944 
 2945         /* Get the synclists lock */
 2946         PCM_SG_LOCK();
 2947 
 2948         do {
 2949                 ret = 0;
 2950                 needlocks = 0;
 2951 
 2952                 /* Search for syncgroup by ID */
 2953                 SLIST_FOREACH(sg, &snd_pcm_syncgroups, link) {
 2954                         if (sg->id == sg_id)
 2955                                 break;
 2956                 }
 2957 
 2958                 /* Return EINVAL if not found */
 2959                 if (sg == NULL) {
 2960                         ret = EINVAL;
 2961                         break;
 2962                 }
 2963 
 2964                 /* Any removals resulting in an empty group should've handled this */
 2965                 KASSERT(!SLIST_EMPTY(&sg->members), ("found empty syncgroup"));
 2966 
 2967                 /*
 2968                  * Attempt to lock all member channels - if any are already
 2969                  * locked, unlock those acquired, sleep for a bit, and try
 2970                  * again.
 2971                  */
 2972                 SLIST_FOREACH(sm, &sg->members, link) {
 2973                         if (CHN_TRYLOCK(sm->ch) == 0) {
 2974                                 int timo = hz * 5/1000; 
 2975                                 if (timo < 1)
 2976                                         timo = 1;
 2977 
 2978                                 /* Release all locked channels so far, retry */
 2979                                 SLIST_FOREACH(sm_tmp, &sg->members, link) {
 2980                                         /* sm is the member already locked */
 2981                                         if (sm == sm_tmp)
 2982                                                 break;
 2983                                         CHN_UNLOCK(sm_tmp->ch);
 2984                                 }
 2985 
 2986                                 /** @todo Is PRIBIO correct/ */
 2987                                 ret = msleep(sm, &snd_pcm_syncgroups_mtx,
 2988                                     PRIBIO | PCATCH, "pcmsg", timo);
 2989                                 if (ret == EINTR || ret == ERESTART)
 2990                                         break;
 2991 
 2992                                 needlocks = 1;
 2993                                 ret = 0; /* Assumes ret == EAGAIN... */
 2994                         }
 2995                 }
 2996         } while (needlocks && ret == 0);
 2997 
 2998         /* Proceed only if no errors encountered. */
 2999         if (ret == 0) {
 3000                 /* Launch channels */
 3001                 while ((sm = SLIST_FIRST(&sg->members)) != NULL) {
 3002                         SLIST_REMOVE_HEAD(&sg->members, link);
 3003 
 3004                         c = sm->ch;
 3005                         c->sm = NULL;
 3006                         chn_start(c, 1);
 3007                         c->flags &= ~CHN_F_NOTRIGGER;
 3008                         CHN_UNLOCK(c);
 3009 
 3010                         free(sm, M_DEVBUF);
 3011                 }
 3012 
 3013                 SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
 3014                 free(sg, M_DEVBUF);
 3015         }
 3016 
 3017         PCM_SG_UNLOCK();
 3018 
 3019         /*
 3020          * Free_unr() may sleep, so be sure to give up the syncgroup lock
 3021          * first.
 3022          */
 3023         if (ret == 0)
 3024                 free_unr(pcmsg_unrhdr, sg_id);
 3025 
 3026         return (ret);
 3027 }
 3028 
 3029 /**
 3030  * @brief Handler for SNDCTL_DSP_POLICY
 3031  *
 3032  * The SNDCTL_DSP_POLICY ioctl is a simpler interface to control fragment
 3033  * size and count like with SNDCTL_DSP_SETFRAGMENT.  Instead of the user
 3034  * specifying those two parameters, s/he simply selects a number from 0..10
 3035  * which corresponds to a buffer size.  Smaller numbers request smaller
 3036  * buffers with lower latencies (at greater overhead from more frequent
 3037  * interrupts), while greater numbers behave in the opposite manner.
 3038  *
 3039  * The 4Front spec states that a value of 5 should be the default.  However,
 3040  * this implementation deviates slightly by using a linear scale without
 3041  * consulting drivers.  I.e., even though drivers may have different default
 3042  * buffer sizes, a policy argument of 5 will have the same result across
 3043  * all drivers.
 3044  *
 3045  * See http://manuals.opensound.com/developer/SNDCTL_DSP_POLICY.html for
 3046  * more information.
 3047  *
 3048  * @todo When SNDCTL_DSP_COOKEDMODE is supported, it'll be necessary to
 3049  *       work with hardware drivers directly.
 3050  *
 3051  * @note PCM channel arguments must not be locked by caller.
 3052  *
 3053  * @param wrch  Pointer to opened playback channel (optional; may be NULL)
 3054  * @param rdch  " recording channel (optional; may be NULL)
 3055  * @param policy Integer from [0:10]
 3056  *
 3057  * @retval 0    constant (for now)
 3058  */
 3059 static int
 3060 dsp_oss_policy(struct pcm_channel *wrch, struct pcm_channel *rdch, int policy)
 3061 {
 3062         int ret;
 3063 
 3064         if (policy < CHN_POLICY_MIN || policy > CHN_POLICY_MAX)
 3065                 return (EIO);
 3066 
 3067         /* Default: success */
 3068         ret = 0;
 3069 
 3070         if (rdch) {
 3071                 CHN_LOCK(rdch);
 3072                 ret = chn_setlatency(rdch, policy);
 3073                 CHN_UNLOCK(rdch);
 3074         }
 3075 
 3076         if (wrch && ret == 0) {
 3077                 CHN_LOCK(wrch);
 3078                 ret = chn_setlatency(wrch, policy);
 3079                 CHN_UNLOCK(wrch);
 3080         }
 3081 
 3082         if (ret)
 3083                 ret = EIO;
 3084 
 3085         return (ret);
 3086 }
 3087 
 3088 /**
 3089  * @brief Enable or disable "cooked" mode
 3090  *
 3091  * This is a handler for @c SNDCTL_DSP_COOKEDMODE.  When in cooked mode, which
 3092  * is the default, the sound system handles rate and format conversions
 3093  * automatically (ex: user writing 11025Hz/8 bit/unsigned but card only
 3094  * operates with 44100Hz/16bit/signed samples).
 3095  *
 3096  * Disabling cooked mode is intended for applications wanting to mmap()
 3097  * a sound card's buffer space directly, bypassing the FreeBSD 2-stage
 3098  * feeder architecture, presumably to gain as much control over audio
 3099  * hardware as possible.
 3100  *
 3101  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_COOKEDMODE.html
 3102  * for more details.
 3103  *
 3104  * @param wrch          playback channel (optional; may be NULL)
 3105  * @param rdch          recording channel (optional; may be NULL)
 3106  * @param enabled       0 = raw mode, 1 = cooked mode
 3107  *
 3108  * @retval EINVAL       Operation not yet supported.
 3109  */
 3110 static int
 3111 dsp_oss_cookedmode(struct pcm_channel *wrch, struct pcm_channel *rdch, int enabled)
 3112 {
 3113 
 3114         /*
 3115          * XXX I just don't get it. Why don't they call it
 3116          * "BITPERFECT" ~ SNDCTL_DSP_BITPERFECT !?!?.
 3117          * This is just plain so confusing, incoherent,
 3118          * <insert any non-printable characters here>.
 3119          */
 3120         if (!(enabled == 1 || enabled == 0))
 3121                 return (EINVAL);
 3122 
 3123         /*
 3124          * I won't give in. I'm inverting its logic here and now.
 3125          * Brag all you want, but "BITPERFECT" should be the better
 3126          * term here.
 3127          */
 3128         enabled ^= 0x00000001;
 3129 
 3130         if (wrch != NULL) {
 3131                 CHN_LOCK(wrch);
 3132                 wrch->flags &= ~CHN_F_BITPERFECT;
 3133                 wrch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3134                 CHN_UNLOCK(wrch);
 3135         }
 3136 
 3137         if (rdch != NULL) {
 3138                 CHN_LOCK(rdch);
 3139                 rdch->flags &= ~CHN_F_BITPERFECT;
 3140                 rdch->flags |= (enabled != 0) ? CHN_F_BITPERFECT : 0x00000000;
 3141                 CHN_UNLOCK(rdch);
 3142         }
 3143 
 3144         return (0);
 3145 }
 3146 
 3147 /**
 3148  * @brief Retrieve channel interleaving order
 3149  *
 3150  * This is the handler for @c SNDCTL_DSP_GET_CHNORDER.
 3151  *
 3152  * See @c http://manuals.opensound.com/developer/SNDCTL_DSP_GET_CHNORDER.html
 3153  * for more details.
 3154  *
 3155  * @note As the ioctl definition is still under construction, FreeBSD
 3156  *       does not currently support SNDCTL_DSP_GET_CHNORDER.
 3157  *
 3158  * @param wrch  playback channel (optional; may be NULL)
 3159  * @param rdch  recording channel (optional; may be NULL)
 3160  * @param map   channel map (result will be stored there)
 3161  *
 3162  * @retval EINVAL       Operation not yet supported.
 3163  */
 3164 static int
 3165 dsp_oss_getchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3166 {
 3167         struct pcm_channel *ch;
 3168         int ret;
 3169 
 3170         ch = (wrch != NULL) ? wrch : rdch;
 3171         if (ch != NULL) {
 3172                 CHN_LOCK(ch);
 3173                 ret = chn_oss_getorder(ch, map);
 3174                 CHN_UNLOCK(ch);
 3175         } else
 3176                 ret = EINVAL;
 3177 
 3178         return (ret);
 3179 }
 3180 
 3181 /**
 3182  * @brief Specify channel interleaving order
 3183  *
 3184  * This is the handler for @c SNDCTL_DSP_SET_CHNORDER.
 3185  *
 3186  * @note As the ioctl definition is still under construction, FreeBSD
 3187  *       does not currently support @c SNDCTL_DSP_SET_CHNORDER.
 3188  *
 3189  * @param wrch  playback channel (optional; may be NULL)
 3190  * @param rdch  recording channel (optional; may be NULL)
 3191  * @param map   channel map
 3192  *
 3193  * @retval EINVAL       Operation not yet supported.
 3194  */
 3195 static int
 3196 dsp_oss_setchnorder(struct pcm_channel *wrch, struct pcm_channel *rdch, unsigned long long *map)
 3197 {
 3198         int ret;
 3199 
 3200         ret = 0;
 3201 
 3202         if (wrch != NULL) {
 3203                 CHN_LOCK(wrch);
 3204                 ret = chn_oss_setorder(wrch, map);
 3205                 CHN_UNLOCK(wrch);
 3206         }
 3207 
 3208         if (ret == 0 && rdch != NULL) {
 3209                 CHN_LOCK(rdch);
 3210                 ret = chn_oss_setorder(rdch, map);
 3211                 CHN_UNLOCK(rdch);
 3212         }
 3213 
 3214         return (ret);
 3215 }
 3216 
 3217 static int
 3218 dsp_oss_getchannelmask(struct pcm_channel *wrch, struct pcm_channel *rdch,
 3219     int *mask)
 3220 {
 3221         struct pcm_channel *ch;
 3222         uint32_t chnmask;
 3223         int ret;
 3224 
 3225         chnmask = 0;
 3226         ch = (wrch != NULL) ? wrch : rdch;
 3227 
 3228         if (ch != NULL) {
 3229                 CHN_LOCK(ch);
 3230                 ret = chn_oss_getmask(ch, &chnmask);
 3231                 CHN_UNLOCK(ch);
 3232         } else
 3233                 ret = EINVAL;
 3234 
 3235         if (ret == 0)
 3236                 *mask = chnmask;
 3237 
 3238         return (ret);
 3239 }
 3240 
 3241 #ifdef OSSV4_EXPERIMENT
 3242 /**
 3243  * @brief Retrieve an audio device's label
 3244  *
 3245  * This is a handler for the @c SNDCTL_GETLABEL ioctl.
 3246  *
 3247  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3248  * for more details.
 3249  *
 3250  * From Hannu@4Front:  "For example ossxmix (just like some HW mixer
 3251  * consoles) can show variable "labels" for certain controls. By default
 3252  * the application name (say quake) is shown as the label but
 3253  * applications may change the labels themselves."
 3254  *
 3255  * @note As the ioctl definition is still under construction, FreeBSD
 3256  *       does not currently support @c SNDCTL_GETLABEL.
 3257  *
 3258  * @param wrch  playback channel (optional; may be NULL)
 3259  * @param rdch  recording channel (optional; may be NULL)
 3260  * @param label label gets copied here
 3261  *
 3262  * @retval EINVAL       Operation not yet supported.
 3263  */
 3264 static int
 3265 dsp_oss_getlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3266 {
 3267         return (EINVAL);
 3268 }
 3269 
 3270 /**
 3271  * @brief Specify an audio device's label
 3272  *
 3273  * This is a handler for the @c SNDCTL_SETLABEL ioctl.  Please see the
 3274  * comments for @c dsp_oss_getlabel immediately above.
 3275  *
 3276  * See @c http://manuals.opensound.com/developer/SNDCTL_GETLABEL.html
 3277  * for more details.
 3278  *
 3279  * @note As the ioctl definition is still under construction, FreeBSD
 3280  *       does not currently support SNDCTL_SETLABEL.
 3281  *
 3282  * @param wrch  playback channel (optional; may be NULL)
 3283  * @param rdch  recording channel (optional; may be NULL)
 3284  * @param label label gets copied from here
 3285  *
 3286  * @retval EINVAL       Operation not yet supported.
 3287  */
 3288 static int
 3289 dsp_oss_setlabel(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_label_t *label)
 3290 {
 3291         return (EINVAL);
 3292 }
 3293 
 3294 /**
 3295  * @brief Retrieve name of currently played song
 3296  *
 3297  * This is a handler for the @c SNDCTL_GETSONG ioctl.  Audio players could
 3298  * tell the system the name of the currently playing song, which would be
 3299  * visible in @c /dev/sndstat.
 3300  *
 3301  * See @c http://manuals.opensound.com/developer/SNDCTL_GETSONG.html
 3302  * for more details.
 3303  *
 3304  * @note As the ioctl definition is still under construction, FreeBSD
 3305  *       does not currently support SNDCTL_GETSONG.
 3306  *
 3307  * @param wrch  playback channel (optional; may be NULL)
 3308  * @param rdch  recording channel (optional; may be NULL)
 3309  * @param song  song name gets copied here
 3310  *
 3311  * @retval EINVAL       Operation not yet supported.
 3312  */
 3313 static int
 3314 dsp_oss_getsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3315 {
 3316         return (EINVAL);
 3317 }
 3318 
 3319 /**
 3320  * @brief Retrieve name of currently played song
 3321  *
 3322  * This is a handler for the @c SNDCTL_SETSONG ioctl.  Audio players could
 3323  * tell the system the name of the currently playing song, which would be
 3324  * visible in @c /dev/sndstat.
 3325  *
 3326  * See @c http://manuals.opensound.com/developer/SNDCTL_SETSONG.html
 3327  * for more details.
 3328  *
 3329  * @note As the ioctl definition is still under construction, FreeBSD
 3330  *       does not currently support SNDCTL_SETSONG.
 3331  *
 3332  * @param wrch  playback channel (optional; may be NULL)
 3333  * @param rdch  recording channel (optional; may be NULL)
 3334  * @param song  song name gets copied from here
 3335  *
 3336  * @retval EINVAL       Operation not yet supported.
 3337  */
 3338 static int
 3339 dsp_oss_setsong(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *song)
 3340 {
 3341         return (EINVAL);
 3342 }
 3343 
 3344 /**
 3345  * @brief Rename a device
 3346  *
 3347  * This is a handler for the @c SNDCTL_SETNAME ioctl.
 3348  *
 3349  * See @c http://manuals.opensound.com/developer/SNDCTL_SETNAME.html for
 3350  * more details.
 3351  *
 3352  * From Hannu@4Front:  "This call is used to change the device name
 3353  * reported in /dev/sndstat and ossinfo. So instead of  using some generic
 3354  * 'OSS loopback audio (MIDI) driver' the device may be given a meaningfull
 3355  * name depending on the current context (for example 'OSS virtual wave table
 3356  * synth' or 'VoIP link to London')."
 3357  *
 3358  * @note As the ioctl definition is still under construction, FreeBSD
 3359  *       does not currently support SNDCTL_SETNAME.
 3360  *
 3361  * @param wrch  playback channel (optional; may be NULL)
 3362  * @param rdch  recording channel (optional; may be NULL)
 3363  * @param name  new device name gets copied from here
 3364  *
 3365  * @retval EINVAL       Operation not yet supported.
 3366  */
 3367 static int
 3368 dsp_oss_setname(struct pcm_channel *wrch, struct pcm_channel *rdch, oss_longname_t *name)
 3369 {
 3370         return (EINVAL);
 3371 }
 3372 #endif  /* !OSSV4_EXPERIMENT */

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