freebsd-skq/sys/dev/sound/pcm/sound.c
Don Lewis a3193a9ca3 Create a new mutex type for virtual channels. This allows us to get
rid of the MTX_DUPOK flag on channel mutexes, which allows witness to
do a better job of lock order checking.  Nuke snd_chnmtxcreate() since
it is no longer needed.

Tested by:	matk
2004-02-28 19:47:02 +00:00

983 lines
21 KiB
C

/*
* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
* (C) 1997 Luigi Rizzo (luigi@iet.unipi.it)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/vchan.h>
#include <dev/sound/pcm/dsp.h>
#include <sys/sysctl.h>
#include "feeder_if.h"
SND_DECLARE_FILE("$FreeBSD$");
devclass_t pcm_devclass;
int pcm_veto_load = 1;
#ifdef USING_DEVFS
int snd_unit = 0;
TUNABLE_INT("hw.snd.unit", &snd_unit);
#endif
int snd_maxautovchans = 0;
TUNABLE_INT("hw.snd.maxautovchans", &snd_maxautovchans);
SYSCTL_NODE(_hw, OID_AUTO, snd, CTLFLAG_RD, 0, "Sound driver");
static int sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose);
struct sysctl_ctx_list *
snd_sysctl_tree(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
return &d->sysctl_tree;
}
struct sysctl_oid *
snd_sysctl_tree_top(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
return d->sysctl_tree_top;
}
void *
snd_mtxcreate(const char *desc, const char *type)
{
#ifdef USING_MUTEX
struct mtx *m;
m = malloc(sizeof(*m), M_DEVBUF, M_WAITOK | M_ZERO);
if (m == NULL)
return NULL;
mtx_init(m, desc, type, MTX_DEF);
return m;
#else
return (void *)0xcafebabe;
#endif
}
void
snd_mtxfree(void *m)
{
#ifdef USING_MUTEX
struct mtx *mtx = m;
/* mtx_assert(mtx, MA_OWNED); */
mtx_destroy(mtx);
free(mtx, M_DEVBUF);
#endif
}
void
snd_mtxassert(void *m)
{
#ifdef USING_MUTEX
#ifdef INVARIANTS
struct mtx *mtx = m;
mtx_assert(mtx, MA_OWNED);
#endif
#endif
}
/*
void
snd_mtxlock(void *m)
{
#ifdef USING_MUTEX
struct mtx *mtx = m;
mtx_lock(mtx);
#endif
}
void
snd_mtxunlock(void *m)
{
#ifdef USING_MUTEX
struct mtx *mtx = m;
mtx_unlock(mtx);
#endif
}
*/
int
snd_setup_intr(device_t dev, struct resource *res, int flags, driver_intr_t hand, void *param, void **cookiep)
{
#ifdef USING_MUTEX
flags &= INTR_MPSAFE;
flags |= INTR_TYPE_AV;
#else
flags = INTR_TYPE_AV;
#endif
return bus_setup_intr(dev, res, flags, hand, param, cookiep);
}
#ifndef PCM_DEBUG_MTX
void
pcm_lock(struct snddev_info *d)
{
snd_mtxlock(d->lock);
}
void
pcm_unlock(struct snddev_info *d)
{
snd_mtxunlock(d->lock);
}
#endif
struct pcm_channel *
pcm_getfakechan(struct snddev_info *d)
{
return d->fakechan;
}
/* return a locked channel */
struct pcm_channel *
pcm_chnalloc(struct snddev_info *d, int direction, pid_t pid, int chnum)
{
struct pcm_channel *c;
struct snddev_channel *sce;
int err;
snd_mtxassert(d->lock);
/* scan for a free channel */
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
if ((c->direction == direction) && !(c->flags & CHN_F_BUSY)) {
if (chnum == -1 || c->num == chnum) {
c->flags |= CHN_F_BUSY;
c->pid = pid;
return c;
}
}
CHN_UNLOCK(c);
}
/* no channel available */
if (direction == PCMDIR_PLAY) {
if ((d->vchancount > 0) && (d->vchancount < snd_maxautovchans)) {
/* try to create a vchan */
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
if (!SLIST_EMPTY(&c->children)) {
err = vchan_create(c);
CHN_UNLOCK(c);
if (!err)
return pcm_chnalloc(d, direction, pid, -1);
else
device_printf(d->dev, "vchan_create(%s) == %d\n", c->name, err);
} else
CHN_UNLOCK(c);
}
}
}
return NULL;
}
/* release a locked channel and unlock it */
int
pcm_chnrelease(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
c->flags &= ~CHN_F_BUSY;
c->pid = -1;
CHN_UNLOCK(c);
return 0;
}
int
pcm_chnref(struct pcm_channel *c, int ref)
{
int r;
CHN_LOCKASSERT(c);
c->refcount += ref;
r = c->refcount;
return r;
}
int
pcm_inprog(struct snddev_info *d, int delta)
{
int r;
if (delta == 0)
return d->inprog;
/* backtrace(); */
pcm_lock(d);
d->inprog += delta;
r = d->inprog;
pcm_unlock(d);
return r;
}
static void
pcm_setmaxautovchans(struct snddev_info *d, int num)
{
struct pcm_channel *c;
struct snddev_channel *sce;
int err, done;
if (num > 0 && d->vchancount == 0) {
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
if ((c->direction == PCMDIR_PLAY) && !(c->flags & CHN_F_BUSY)) {
c->flags |= CHN_F_BUSY;
err = vchan_create(c);
if (err) {
c->flags &= ~CHN_F_BUSY;
CHN_UNLOCK(c);
device_printf(d->dev, "vchan_create(%s) == %d\n", c->name, err);
} else
CHN_UNLOCK(c);
return;
}
CHN_UNLOCK(c);
}
}
if (num == 0 && d->vchancount > 0) {
done = 0;
while (!done) {
done = 1;
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
if ((c->flags & CHN_F_VIRTUAL) && !(c->flags & CHN_F_BUSY)) {
done = 0;
snd_mtxlock(d->lock);
err = vchan_destroy(c);
snd_mtxunlock(d->lock);
if (err)
device_printf(d->dev, "vchan_destroy(%s) == %d\n", c->name, err);
break; /* restart */
}
}
}
}
}
#ifdef USING_DEVFS
static int
sysctl_hw_snd_unit(SYSCTL_HANDLER_ARGS)
{
struct snddev_info *d;
int error, unit;
unit = snd_unit;
error = sysctl_handle_int(oidp, &unit, sizeof(unit), req);
if (error == 0 && req->newptr != NULL) {
if (unit < 0 || unit >= devclass_get_maxunit(pcm_devclass))
return EINVAL;
d = devclass_get_softc(pcm_devclass, unit);
if (d == NULL || SLIST_EMPTY(&d->channels))
return EINVAL;
snd_unit = unit;
}
return (error);
}
SYSCTL_PROC(_hw_snd, OID_AUTO, unit, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_unit, "I", "");
#endif
static int
sysctl_hw_snd_maxautovchans(SYSCTL_HANDLER_ARGS)
{
struct snddev_info *d;
int i, v, error;
v = snd_maxautovchans;
error = sysctl_handle_int(oidp, &v, sizeof(v), req);
if (error == 0 && req->newptr != NULL) {
if (v < 0 || v >= SND_MAXVCHANS || pcm_devclass == NULL)
return EINVAL;
if (v != snd_maxautovchans) {
for (i = 0; i < devclass_get_maxunit(pcm_devclass); i++) {
d = devclass_get_softc(pcm_devclass, i);
if (!d)
continue;
pcm_setmaxautovchans(d, v);
}
}
snd_maxautovchans = v;
}
return (error);
}
SYSCTL_PROC(_hw_snd, OID_AUTO, maxautovchans, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_maxautovchans, "I", "");
struct pcm_channel *
pcm_chn_create(struct snddev_info *d, struct pcm_channel *parent, kobj_class_t cls, int dir, void *devinfo)
{
struct pcm_channel *ch;
char *dirs;
int direction, err, *pnum;
switch(dir) {
case PCMDIR_PLAY:
dirs = "play";
direction = PCMDIR_PLAY;
pnum = &d->playcount;
break;
case PCMDIR_REC:
dirs = "record";
direction = PCMDIR_REC;
pnum = &d->reccount;
break;
case PCMDIR_VIRTUAL:
dirs = "virtual";
direction = PCMDIR_PLAY;
pnum = &d->vchancount;
break;
default:
return NULL;
}
ch = malloc(sizeof(*ch), M_DEVBUF, M_WAITOK | M_ZERO);
if (!ch)
return NULL;
ch->methods = kobj_create(cls, M_DEVBUF, M_WAITOK);
if (!ch->methods) {
free(ch, M_DEVBUF);
return NULL;
}
snd_mtxlock(d->lock);
ch->num = (*pnum)++;
snd_mtxunlock(d->lock);
ch->pid = -1;
ch->parentsnddev = d;
ch->parentchannel = parent;
ch->dev = d->dev;
snprintf(ch->name, 32, "%s:%s:%d", device_get_nameunit(ch->dev), dirs, ch->num);
err = chn_init(ch, devinfo, dir, direction);
if (err) {
device_printf(d->dev, "chn_init(%s) failed: err = %d\n", ch->name, err);
kobj_delete(ch->methods, M_DEVBUF);
free(ch, M_DEVBUF);
snd_mtxlock(d->lock);
(*pnum)--;
snd_mtxunlock(d->lock);
return NULL;
}
return ch;
}
int
pcm_chn_destroy(struct pcm_channel *ch)
{
struct snddev_info *d;
int err;
d = ch->parentsnddev;
err = chn_kill(ch);
if (err) {
device_printf(d->dev, "chn_kill(%s) failed, err = %d\n", ch->name, err);
return err;
}
kobj_delete(ch->methods, M_DEVBUF);
free(ch, M_DEVBUF);
return 0;
}
int
pcm_chn_add(struct snddev_info *d, struct pcm_channel *ch)
{
struct snddev_channel *sce, *tmp, *after;
int device = device_get_unit(d->dev);
/*
* Note it's confusing nomenclature.
* dev_t
* device -> pcm_device
* unit -> pcm_channel
* channel -> snddev_channel
* device_t
* unit -> pcm_device
*/
sce = malloc(sizeof(*sce), M_DEVBUF, M_WAITOK | M_ZERO);
if (!sce) {
return ENOMEM;
}
snd_mtxlock(d->lock);
sce->channel = ch;
sce->chan_num= d->devcount++;
if (SLIST_EMPTY(&d->channels)) {
SLIST_INSERT_HEAD(&d->channels, sce, link);
} else {
after = NULL;
SLIST_FOREACH(tmp, &d->channels, link) {
after = tmp;
}
SLIST_INSERT_AFTER(after, sce, link);
}
snd_mtxunlock(d->lock);
sce->dsp_devt= make_dev(&dsp_cdevsw,
PCMMKMINOR(device, SND_DEV_DSP, sce->chan_num),
UID_ROOT, GID_WHEEL, 0666, "dsp%d.%d",
device, sce->chan_num);
sce->dspW_devt= make_dev(&dsp_cdevsw,
PCMMKMINOR(device, SND_DEV_DSP16, sce->chan_num),
UID_ROOT, GID_WHEEL, 0666, "dspW%d.%d",
device, sce->chan_num);
sce->audio_devt= make_dev(&dsp_cdevsw,
PCMMKMINOR(device, SND_DEV_AUDIO, sce->chan_num),
UID_ROOT, GID_WHEEL, 0666, "audio%d.%d",
device, sce->chan_num);
if (ch->direction == PCMDIR_REC)
sce->dspr_devt = make_dev(&dsp_cdevsw,
PCMMKMINOR(device, SND_DEV_DSPREC,
sce->chan_num), UID_ROOT, GID_WHEEL,
0666, "dspr%d.%d", device, sce->chan_num);
return 0;
}
int
pcm_chn_remove(struct snddev_info *d, struct pcm_channel *ch)
{
struct snddev_channel *sce;
#if 0
int ourlock;
ourlock = 0;
if (!mtx_owned(d->lock)) {
snd_mtxlock(d->lock);
ourlock = 1;
}
#endif
SLIST_FOREACH(sce, &d->channels, link) {
if (sce->channel == ch)
goto gotit;
}
#if 0
if (ourlock)
snd_mtxunlock(d->lock);
#endif
return EINVAL;
gotit:
SLIST_REMOVE(&d->channels, sce, snddev_channel, link);
if (ch->direction == PCMDIR_REC)
d->reccount--;
else if (ch->flags & CHN_F_VIRTUAL)
d->vchancount--;
else
d->playcount--;
#if 0
if (ourlock)
snd_mtxunlock(d->lock);
#endif
free(sce, M_DEVBUF);
return 0;
}
int
pcm_addchan(device_t dev, int dir, kobj_class_t cls, void *devinfo)
{
struct snddev_info *d = device_get_softc(dev);
struct pcm_channel *ch;
int err;
ch = pcm_chn_create(d, NULL, cls, dir, devinfo);
if (!ch) {
device_printf(d->dev, "pcm_chn_create(%s, %d, %p) failed\n", cls->name, dir, devinfo);
return ENODEV;
}
err = pcm_chn_add(d, ch);
if (err) {
device_printf(d->dev, "pcm_chn_add(%s) failed, err=%d\n", ch->name, err);
pcm_chn_destroy(ch);
return err;
}
CHN_LOCK(ch);
if (snd_maxautovchans > 0 && (d->flags & SD_F_AUTOVCHAN) &&
ch->direction == PCMDIR_PLAY && d->vchancount == 0) {
ch->flags |= CHN_F_BUSY;
err = vchan_create(ch);
if (err) {
ch->flags &= ~CHN_F_BUSY;
CHN_UNLOCK(ch);
device_printf(d->dev, "vchan_create(%s) == %d\n", ch->name, err);
return err;
}
}
CHN_UNLOCK(ch);
return err;
}
static int
pcm_killchan(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
struct snddev_channel *sce;
struct pcm_channel *ch;
int error = 0;
sce = SLIST_FIRST(&d->channels);
ch = sce->channel;
error = pcm_chn_remove(d, sce->channel);
if (error)
return (error);
return (pcm_chn_destroy(ch));
}
int
pcm_setstatus(device_t dev, char *str)
{
struct snddev_info *d = device_get_softc(dev);
snd_mtxlock(d->lock);
strncpy(d->status, str, SND_STATUSLEN);
snd_mtxunlock(d->lock);
return 0;
}
u_int32_t
pcm_getflags(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
return d->flags;
}
void
pcm_setflags(device_t dev, u_int32_t val)
{
struct snddev_info *d = device_get_softc(dev);
d->flags = val;
}
void *
pcm_getdevinfo(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
return d->devinfo;
}
unsigned int
pcm_getbuffersize(device_t dev, unsigned int min, unsigned int deflt, unsigned int max)
{
struct snddev_info *d = device_get_softc(dev);
int sz, x;
sz = 0;
if (resource_int_value(device_get_name(dev), device_get_unit(dev), "buffersize", &sz) == 0) {
x = sz;
RANGE(sz, min, max);
if (x != sz)
device_printf(dev, "'buffersize=%d' hint is out of range (%d-%d), using %d\n", x, min, max, sz);
x = min;
while (x < sz)
x <<= 1;
if (x > sz)
x >>= 1;
if (x != sz) {
device_printf(dev, "'buffersize=%d' hint is not a power of 2, using %d\n", sz, x);
sz = x;
}
} else {
sz = deflt;
}
d->bufsz = sz;
return sz;
}
int
pcm_register(device_t dev, void *devinfo, int numplay, int numrec)
{
struct snddev_info *d = device_get_softc(dev);
if (pcm_veto_load) {
device_printf(dev, "disabled due to an error while initialising: %d\n", pcm_veto_load);
return EINVAL;
}
d->lock = snd_mtxcreate(device_get_nameunit(dev), "sound cdev");
d->flags = 0;
d->dev = dev;
d->devinfo = devinfo;
d->devcount = 0;
d->reccount = 0;
d->playcount = 0;
d->vchancount = 0;
d->inprog = 0;
SLIST_INIT(&d->channels);
SLIST_INIT(&d->channels);
if (((numplay == 0) || (numrec == 0)) && (numplay != numrec))
d->flags |= SD_F_SIMPLEX;
d->fakechan = fkchan_setup(dev);
chn_init(d->fakechan, NULL, 0, 0);
#ifdef SND_DYNSYSCTL
sysctl_ctx_init(&d->sysctl_tree);
d->sysctl_tree_top = SYSCTL_ADD_NODE(&d->sysctl_tree,
SYSCTL_STATIC_CHILDREN(_hw_snd), OID_AUTO,
device_get_nameunit(dev), CTLFLAG_RD, 0, "");
if (d->sysctl_tree_top == NULL) {
sysctl_ctx_free(&d->sysctl_tree);
goto no;
}
SYSCTL_ADD_INT(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
OID_AUTO, "buffersize", CTLFLAG_RD, &d->bufsz, 0, "");
#endif
if (numplay > 0)
vchan_initsys(dev);
if (numplay == 1)
d->flags |= SD_F_AUTOVCHAN;
sndstat_register(dev, d->status, sndstat_prepare_pcm);
return 0;
no:
snd_mtxfree(d->lock);
return ENXIO;
}
int
pcm_unregister(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
struct snddev_channel *sce;
struct pcm_channel *ch;
snd_mtxlock(d->lock);
if (d->inprog) {
device_printf(dev, "unregister: operation in progress\n");
snd_mtxunlock(d->lock);
return EBUSY;
}
if (sndstat_busy() != 0) {
device_printf(dev, "unregister: sndstat busy\n");
snd_mtxunlock(d->lock);
return EBUSY;
}
SLIST_FOREACH(sce, &d->channels, link) {
ch = sce->channel;
if (ch->refcount > 0) {
device_printf(dev, "unregister: channel %s busy (pid %d)\n", ch->name, ch->pid);
snd_mtxunlock(d->lock);
return EBUSY;
}
}
SLIST_FOREACH(sce, &d->channels, link) {
destroy_dev(sce->dsp_devt);
destroy_dev(sce->dspW_devt);
destroy_dev(sce->audio_devt);
if (sce->dspr_devt)
destroy_dev(sce->dspr_devt);
}
if (mixer_uninit(dev)) {
device_printf(dev, "unregister: mixer busy\n");
snd_mtxunlock(d->lock);
return EBUSY;
}
#ifdef SND_DYNSYSCTL
d->sysctl_tree_top = NULL;
sysctl_ctx_free(&d->sysctl_tree);
#endif
while (!SLIST_EMPTY(&d->channels))
pcm_killchan(dev);
chn_kill(d->fakechan);
fkchan_kill(d->fakechan);
sndstat_unregister(dev);
snd_mtxunlock(d->lock);
snd_mtxfree(d->lock);
return 0;
}
/************************************************************************/
static int
sndstat_prepare_pcm(struct sbuf *s, device_t dev, int verbose)
{
struct snddev_info *d;
struct snddev_channel *sce;
struct pcm_channel *c;
struct pcm_feeder *f;
int pc, rc, vc;
if (verbose < 1)
return 0;
d = device_get_softc(dev);
if (!d)
return ENXIO;
snd_mtxlock(d->lock);
if (!SLIST_EMPTY(&d->channels)) {
pc = rc = vc = 0;
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
if (c->direction == PCMDIR_PLAY) {
if (c->flags & CHN_F_VIRTUAL)
vc++;
else
pc++;
} else
rc++;
}
sbuf_printf(s, " (%dp/%dr/%dv channels%s%s)", d->playcount, d->reccount, d->vchancount,
(d->flags & SD_F_SIMPLEX)? "" : " duplex",
#ifdef USING_DEVFS
(device_get_unit(dev) == snd_unit)? " default" : ""
#else
""
#endif
);
if (verbose <= 1) {
snd_mtxunlock(d->lock);
return 0;
}
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
sbuf_printf(s, "\n\t");
/* it would be better to indent child channels */
sbuf_printf(s, "%s[%s]: ", c->parentchannel? c->parentchannel->name : "", c->name);
sbuf_printf(s, "spd %d", c->speed);
if (c->speed != sndbuf_getspd(c->bufhard))
sbuf_printf(s, "/%d", sndbuf_getspd(c->bufhard));
sbuf_printf(s, ", fmt 0x%08x", c->format);
if (c->format != sndbuf_getfmt(c->bufhard))
sbuf_printf(s, "/0x%08x", sndbuf_getfmt(c->bufhard));
sbuf_printf(s, ", flags 0x%08x, 0x%08x", c->flags, c->feederflags);
if (c->pid != -1)
sbuf_printf(s, ", pid %d", c->pid);
sbuf_printf(s, "\n\t");
if (c->bufhard != NULL && c->bufsoft != NULL) {
sbuf_printf(s, "interrupts %d, ", c->interrupts);
if (c->direction == PCMDIR_REC)
sbuf_printf(s, "overruns %d, hfree %d, sfree %d",
c->xruns, sndbuf_getfree(c->bufhard), sndbuf_getfree(c->bufsoft));
else
sbuf_printf(s, "underruns %d, ready %d",
c->xruns, sndbuf_getready(c->bufsoft));
sbuf_printf(s, "\n\t");
}
sbuf_printf(s, "{%s}", (c->direction == PCMDIR_REC)? "hardware" : "userland");
sbuf_printf(s, " -> ");
f = c->feeder;
while (f->source != NULL)
f = f->source;
while (f != NULL) {
sbuf_printf(s, "%s", f->class->name);
if (f->desc->type == FEEDER_FMT)
sbuf_printf(s, "(0x%08x -> 0x%08x)", f->desc->in, f->desc->out);
if (f->desc->type == FEEDER_RATE)
sbuf_printf(s, "(%d -> %d)", FEEDER_GET(f, FEEDRATE_SRC), FEEDER_GET(f, FEEDRATE_DST));
if (f->desc->type == FEEDER_ROOT || f->desc->type == FEEDER_MIXER)
sbuf_printf(s, "(0x%08x)", f->desc->out);
sbuf_printf(s, " -> ");
f = f->parent;
}
sbuf_printf(s, "{%s}", (c->direction == PCMDIR_REC)? "userland" : "hardware");
}
} else
sbuf_printf(s, " (mixer only)");
snd_mtxunlock(d->lock);
return 0;
}
/************************************************************************/
#ifdef SND_DYNSYSCTL
int
sysctl_hw_snd_vchans(SYSCTL_HANDLER_ARGS)
{
struct snddev_info *d;
struct snddev_channel *sce;
struct pcm_channel *c;
int err, newcnt, cnt, busy;
int x;
d = oidp->oid_arg1;
x = pcm_inprog(d, 1);
if (x != 1) {
printf("x: %d\n", x);
pcm_inprog(d, -1);
return EINPROGRESS;
}
busy = 0;
cnt = 0;
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
if ((c->direction == PCMDIR_PLAY) && (c->flags & CHN_F_VIRTUAL)) {
cnt++;
if (c->flags & CHN_F_BUSY)
busy++;
}
CHN_UNLOCK(c);
}
newcnt = cnt;
err = sysctl_handle_int(oidp, &newcnt, sizeof(newcnt), req);
if (err == 0 && req->newptr != NULL) {
if (newcnt < 0 || newcnt > SND_MAXVCHANS) {
pcm_inprog(d, -1);
return E2BIG;
}
if (newcnt > cnt) {
/* add new vchans - find a parent channel first */
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
/* not a candidate if not a play channel */
if (c->direction != PCMDIR_PLAY)
goto next;
/* not a candidate if a virtual channel */
if (c->flags & CHN_F_VIRTUAL)
goto next;
/* not a candidate if it's in use */
if (!(c->flags & CHN_F_BUSY) ||
!(SLIST_EMPTY(&c->children)))
/*
* if we get here we're a nonvirtual
* play channel, and either
* 1) not busy
* 2) busy with children, not directly
* open
*
* thus we can add children
*/
goto addok;
next:
CHN_UNLOCK(c);
}
pcm_inprog(d, -1);
return EBUSY;
addok:
c->flags |= CHN_F_BUSY;
while (err == 0 && newcnt > cnt) {
err = vchan_create(c);
if (err == 0)
cnt++;
}
if (SLIST_EMPTY(&c->children))
c->flags &= ~CHN_F_BUSY;
CHN_UNLOCK(c);
} else if (newcnt < cnt) {
if (busy > newcnt) {
printf("cnt %d, newcnt %d, busy %d\n", cnt, newcnt, busy);
pcm_inprog(d, -1);
return EBUSY;
}
snd_mtxlock(d->lock);
while (err == 0 && newcnt < cnt) {
SLIST_FOREACH(sce, &d->channels, link) {
c = sce->channel;
CHN_LOCK(c);
if ((c->flags & (CHN_F_BUSY | CHN_F_VIRTUAL)) == CHN_F_VIRTUAL)
goto remok;
CHN_UNLOCK(c);
}
snd_mtxunlock(d->lock);
pcm_inprog(d, -1);
return EINVAL;
remok:
CHN_UNLOCK(c);
err = vchan_destroy(c);
if (err == 0)
cnt--;
}
snd_mtxunlock(d->lock);
}
}
pcm_inprog(d, -1);
return err;
}
#endif
/************************************************************************/
static moduledata_t sndpcm_mod = {
"snd_pcm",
NULL,
NULL
};
DECLARE_MODULE(snd_pcm, sndpcm_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_VERSION(snd_pcm, PCM_MODVER);