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/sndstat.c

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    1 /*-
    2  * Copyright (c) 2001 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 #include <dev/sound/pcm/vchan.h>
   29 #include <dev/sound/version.h>
   30 #ifdef  USING_MUTEX
   31 #include <sys/sx.h>
   32 #endif
   33 
   34 SND_DECLARE_FILE("$FreeBSD$");
   35 
   36 #define SS_TYPE_MODULE          0
   37 #define SS_TYPE_FIRST           1
   38 #define SS_TYPE_PCM             1
   39 #define SS_TYPE_MIDI            2
   40 #define SS_TYPE_SEQUENCER       3
   41 #define SS_TYPE_LAST            3
   42 
   43 static d_open_t sndstat_open;
   44 static d_close_t sndstat_close;
   45 static d_read_t sndstat_read;
   46 
   47 static struct cdevsw sndstat_cdevsw = {
   48         .d_version =    D_VERSION,
   49         .d_open =       sndstat_open,
   50         .d_close =      sndstat_close,
   51         .d_read =       sndstat_read,
   52         .d_name =       "sndstat",
   53 };
   54 
   55 struct sndstat_entry {
   56         SLIST_ENTRY(sndstat_entry) link;
   57         device_t dev;
   58         char *str;
   59         sndstat_handler handler;
   60         int type, unit;
   61 };
   62 
   63 #ifdef  USING_MUTEX
   64 static struct mtx sndstat_lock;
   65 #endif
   66 static struct sbuf sndstat_sbuf;
   67 static struct cdev *sndstat_dev = NULL;
   68 static int sndstat_bufptr = -1;
   69 static int sndstat_maxunit = -1;
   70 static int sndstat_files = 0;
   71 
   72 #define SNDSTAT_PID(x)          ((pid_t)((intptr_t)((x)->si_drv1)))
   73 #define SNDSTAT_PID_SET(x, y)   (x)->si_drv1 = (void *)((intptr_t)(y))
   74 #define SNDSTAT_FLUSH()         do {                                    \
   75         if (sndstat_bufptr != -1) {                                     \
   76                 sbuf_delete(&sndstat_sbuf);                             \
   77                 sndstat_bufptr = -1;                                    \
   78         }                                                               \
   79 } while(0)
   80 
   81 static SLIST_HEAD(, sndstat_entry) sndstat_devlist = SLIST_HEAD_INITIALIZER(none);
   82 
   83 int snd_verbose = 1;
   84 #ifdef  USING_MUTEX
   85 TUNABLE_INT("hw.snd.verbose", &snd_verbose);
   86 #else
   87 TUNABLE_INT_DECL("hw.snd.verbose", 1, snd_verbose);
   88 #endif
   89 
   90 #ifdef SND_DEBUG
   91 static int
   92 sysctl_hw_snd_sndstat_pid(SYSCTL_HANDLER_ARGS)
   93 {
   94         int err, val;
   95 
   96         if (sndstat_dev == NULL)
   97                 return (EINVAL);
   98 
   99         mtx_lock(&sndstat_lock);
  100         val = (int)SNDSTAT_PID(sndstat_dev);
  101         mtx_unlock(&sndstat_lock);
  102         err = sysctl_handle_int(oidp, &val, 0, req);
  103         if (err == 0 && req->newptr != NULL && val == 0) {
  104                 mtx_lock(&sndstat_lock);
  105                 SNDSTAT_FLUSH();
  106                 SNDSTAT_PID_SET(sndstat_dev, 0);
  107                 mtx_unlock(&sndstat_lock);
  108         }
  109         return (err);
  110 }
  111 SYSCTL_PROC(_hw_snd, OID_AUTO, sndstat_pid, CTLTYPE_INT | CTLFLAG_RW,
  112     0, sizeof(int), sysctl_hw_snd_sndstat_pid, "I", "sndstat busy pid");
  113 #endif
  114 
  115 static int sndstat_prepare(struct sbuf *s);
  116 
  117 static int
  118 sysctl_hw_sndverbose(SYSCTL_HANDLER_ARGS)
  119 {
  120         int error, verbose;
  121 
  122         verbose = snd_verbose;
  123         error = sysctl_handle_int(oidp, &verbose, 0, req);
  124         if (error == 0 && req->newptr != NULL) {
  125                 mtx_lock(&sndstat_lock);
  126                 if (verbose < 0 || verbose > 4)
  127                         error = EINVAL;
  128                 else
  129                         snd_verbose = verbose;
  130                 mtx_unlock(&sndstat_lock);
  131         }
  132         return error;
  133 }
  134 SYSCTL_PROC(_hw_snd, OID_AUTO, verbose, CTLTYPE_INT | CTLFLAG_RW,
  135             0, sizeof(int), sysctl_hw_sndverbose, "I", "verbosity level");
  136 
  137 static int
  138 sndstat_open(struct cdev *i_dev, int flags, int mode, struct thread *td)
  139 {
  140         if (sndstat_dev == NULL || i_dev != sndstat_dev)
  141                 return EBADF;
  142 
  143         mtx_lock(&sndstat_lock);
  144         if (SNDSTAT_PID(i_dev) != 0) {
  145                 mtx_unlock(&sndstat_lock);
  146                 return EBUSY;
  147         }
  148         SNDSTAT_PID_SET(i_dev, td->td_proc->p_pid);
  149         mtx_unlock(&sndstat_lock);
  150         if (sbuf_new(&sndstat_sbuf, NULL, 4096, SBUF_AUTOEXTEND) == NULL) {
  151                 mtx_lock(&sndstat_lock);
  152                 SNDSTAT_PID_SET(i_dev, 0);
  153                 mtx_unlock(&sndstat_lock);
  154                 return ENXIO;
  155         }
  156         sndstat_bufptr = 0;
  157         return 0;
  158 }
  159 
  160 static int
  161 sndstat_close(struct cdev *i_dev, int flags, int mode, struct thread *td)
  162 {
  163         if (sndstat_dev == NULL || i_dev != sndstat_dev)
  164                 return EBADF;
  165 
  166         mtx_lock(&sndstat_lock);
  167         if (SNDSTAT_PID(i_dev) == 0) {
  168                 mtx_unlock(&sndstat_lock);
  169                 return EBADF;
  170         }
  171 
  172         SNDSTAT_FLUSH();
  173         SNDSTAT_PID_SET(i_dev, 0);
  174 
  175         mtx_unlock(&sndstat_lock);
  176 
  177         return 0;
  178 }
  179 
  180 static int
  181 sndstat_read(struct cdev *i_dev, struct uio *buf, int flag)
  182 {
  183         int l, err;
  184 
  185         if (sndstat_dev == NULL || i_dev != sndstat_dev)
  186                 return EBADF;
  187 
  188         mtx_lock(&sndstat_lock);
  189         if (SNDSTAT_PID(i_dev) != buf->uio_td->td_proc->p_pid ||
  190             sndstat_bufptr == -1) {
  191                 mtx_unlock(&sndstat_lock);
  192                 return EBADF;
  193         }
  194         mtx_unlock(&sndstat_lock);
  195 
  196         if (sndstat_bufptr == 0) {
  197                 err = (sndstat_prepare(&sndstat_sbuf) > 0) ? 0 : ENOMEM;
  198                 if (err) {
  199                         mtx_lock(&sndstat_lock);
  200                         SNDSTAT_FLUSH();
  201                         mtx_unlock(&sndstat_lock);
  202                         return err;
  203                 }
  204         }
  205 
  206         l = min(buf->uio_resid, sbuf_len(&sndstat_sbuf) - sndstat_bufptr);
  207         err = (l > 0)? uiomove(sbuf_data(&sndstat_sbuf) + sndstat_bufptr, l, buf) : 0;
  208         sndstat_bufptr += l;
  209 
  210         return err;
  211 }
  212 
  213 /************************************************************************/
  214 
  215 static struct sndstat_entry *
  216 sndstat_find(int type, int unit)
  217 {
  218         struct sndstat_entry *ent;
  219 
  220         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  221                 if (ent->type == type && ent->unit == unit)
  222                         return ent;
  223         }
  224 
  225         return NULL;
  226 }
  227 
  228 int
  229 sndstat_acquire(struct thread *td)
  230 {
  231         if (sndstat_dev == NULL)
  232                 return EBADF;
  233 
  234         mtx_lock(&sndstat_lock);
  235         if (SNDSTAT_PID(sndstat_dev) != 0) {
  236                 mtx_unlock(&sndstat_lock);
  237                 return EBUSY;
  238         }
  239         SNDSTAT_PID_SET(sndstat_dev, td->td_proc->p_pid);
  240         mtx_unlock(&sndstat_lock);
  241         return 0;
  242 }
  243 
  244 int
  245 sndstat_release(struct thread *td)
  246 {
  247         if (sndstat_dev == NULL)
  248                 return EBADF;
  249 
  250         mtx_lock(&sndstat_lock);
  251         if (SNDSTAT_PID(sndstat_dev) != td->td_proc->p_pid) {
  252                 mtx_unlock(&sndstat_lock);
  253                 return EBADF;
  254         }
  255         SNDSTAT_PID_SET(sndstat_dev, 0);
  256         mtx_unlock(&sndstat_lock);
  257         return 0;
  258 }
  259 
  260 int
  261 sndstat_register(device_t dev, char *str, sndstat_handler handler)
  262 {
  263         struct sndstat_entry *ent;
  264         const char *devtype;
  265         int type, unit;
  266 
  267         if (dev) {
  268                 unit = device_get_unit(dev);
  269                 devtype = device_get_name(dev);
  270                 if (!strcmp(devtype, "pcm"))
  271                         type = SS_TYPE_PCM;
  272                 else if (!strcmp(devtype, "midi"))
  273                         type = SS_TYPE_MIDI;
  274                 else if (!strcmp(devtype, "sequencer"))
  275                         type = SS_TYPE_SEQUENCER;
  276                 else
  277                         return EINVAL;
  278         } else {
  279                 type = SS_TYPE_MODULE;
  280                 unit = -1;
  281         }
  282 
  283         ent = malloc(sizeof *ent, M_DEVBUF, M_WAITOK | M_ZERO);
  284         ent->dev = dev;
  285         ent->str = str;
  286         ent->type = type;
  287         ent->unit = unit;
  288         ent->handler = handler;
  289 
  290         mtx_lock(&sndstat_lock);
  291         SLIST_INSERT_HEAD(&sndstat_devlist, ent, link);
  292         if (type == SS_TYPE_MODULE)
  293                 sndstat_files++;
  294         sndstat_maxunit = (unit > sndstat_maxunit)? unit : sndstat_maxunit;
  295         mtx_unlock(&sndstat_lock);
  296 
  297         return 0;
  298 }
  299 
  300 int
  301 sndstat_registerfile(char *str)
  302 {
  303         return sndstat_register(NULL, str, NULL);
  304 }
  305 
  306 int
  307 sndstat_unregister(device_t dev)
  308 {
  309         struct sndstat_entry *ent;
  310 
  311         mtx_lock(&sndstat_lock);
  312         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  313                 if (ent->dev == dev) {
  314                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  315                         mtx_unlock(&sndstat_lock);
  316                         free(ent, M_DEVBUF);
  317 
  318                         return 0;
  319                 }
  320         }
  321         mtx_unlock(&sndstat_lock);
  322 
  323         return ENXIO;
  324 }
  325 
  326 int
  327 sndstat_unregisterfile(char *str)
  328 {
  329         struct sndstat_entry *ent;
  330 
  331         mtx_lock(&sndstat_lock);
  332         SLIST_FOREACH(ent, &sndstat_devlist, link) {
  333                 if (ent->dev == NULL && ent->str == str) {
  334                         SLIST_REMOVE(&sndstat_devlist, ent, sndstat_entry, link);
  335                         sndstat_files--;
  336                         mtx_unlock(&sndstat_lock);
  337                         free(ent, M_DEVBUF);
  338 
  339                         return 0;
  340                 }
  341         }
  342         mtx_unlock(&sndstat_lock);
  343 
  344         return ENXIO;
  345 }
  346 
  347 /************************************************************************/
  348 
  349 static int
  350 sndstat_prepare(struct sbuf *s)
  351 {
  352         struct sndstat_entry *ent;
  353         struct snddev_info *d;
  354         int i, j;
  355 
  356         sbuf_printf(s, "FreeBSD Audio Driver (newpcm: %ubit %d/%s)\n",
  357             (u_int)sizeof(intpcm_t) << 3, SND_DRV_VERSION, MACHINE_ARCH);
  358         if (SLIST_EMPTY(&sndstat_devlist)) {
  359                 sbuf_printf(s, "No devices installed.\n");
  360                 sbuf_finish(s);
  361                 return sbuf_len(s);
  362         }
  363 
  364         sbuf_printf(s, "Installed devices:\n");
  365 
  366         for (i = 0; i <= sndstat_maxunit; i++) {
  367                 for (j = SS_TYPE_FIRST; j <= SS_TYPE_LAST; j++) {
  368                         ent = sndstat_find(j, i);
  369                         if (!ent)
  370                                 continue;
  371                         d = device_get_softc(ent->dev);
  372                         if (!PCM_REGISTERED(d))
  373                                 continue;
  374                         /* XXX Need Giant magic entry ??? */
  375                         PCM_ACQUIRE_QUICK(d);
  376                         sbuf_printf(s, "%s:", device_get_nameunit(ent->dev));
  377                         sbuf_printf(s, " <%s>", device_get_desc(ent->dev));
  378                         sbuf_printf(s, " %s [%s]", ent->str,
  379                             (d->flags & SD_F_MPSAFE) ? "MPSAFE" : "GIANT");
  380                         if (ent->handler)
  381                                 ent->handler(s, ent->dev, snd_verbose);
  382                         else
  383                                 sbuf_printf(s, " [no handler]");
  384                         sbuf_printf(s, "\n");
  385                         PCM_RELEASE_QUICK(d);
  386                 }
  387         }
  388 
  389         if (snd_verbose >= 3 && sndstat_files > 0) {
  390                 sbuf_printf(s, "\nFile Versions:\n");
  391 
  392                 SLIST_FOREACH(ent, &sndstat_devlist, link) {
  393                         if (ent->dev == NULL && ent->str != NULL)
  394                                 sbuf_printf(s, "%s\n", ent->str);
  395                 }
  396         }
  397 
  398         sbuf_finish(s);
  399         return sbuf_len(s);
  400 }
  401 
  402 static int
  403 sndstat_init(void)
  404 {
  405         if (sndstat_dev != NULL)
  406                 return EINVAL;
  407         mtx_init(&sndstat_lock, "sndstat", "sndstat lock", MTX_DEF);
  408         sndstat_dev = make_dev(&sndstat_cdevsw, SND_DEV_STATUS,
  409             UID_ROOT, GID_WHEEL, 0444, "sndstat");
  410         return 0;
  411 }
  412 
  413 static int
  414 sndstat_uninit(void)
  415 {
  416         if (sndstat_dev == NULL)
  417                 return EINVAL;
  418 
  419         mtx_lock(&sndstat_lock);
  420         if (SNDSTAT_PID(sndstat_dev) != curthread->td_proc->p_pid) {
  421                 mtx_unlock(&sndstat_lock);
  422                 return EBUSY;
  423         }
  424 
  425         SNDSTAT_FLUSH();
  426 
  427         mtx_unlock(&sndstat_lock);
  428 
  429         destroy_dev(sndstat_dev);
  430         sndstat_dev = NULL;
  431 
  432         mtx_destroy(&sndstat_lock);
  433         return 0;
  434 }
  435 
  436 static void
  437 sndstat_sysinit(void *p)
  438 {
  439         sndstat_init();
  440 }
  441 
  442 static void
  443 sndstat_sysuninit(void *p)
  444 {
  445         int error;
  446 
  447         error = sndstat_uninit();
  448         KASSERT(error == 0, ("%s: error = %d", __func__, error));
  449 }
  450 
  451 SYSINIT(sndstat_sysinit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysinit, NULL);
  452 SYSUNINIT(sndstat_sysuninit, SI_SUB_DRIVERS, SI_ORDER_FIRST, sndstat_sysuninit, NULL);

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