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freebsd-dev/sys/dev/sound/pcm/sound.h
Hans Petter Selasky 8461d581cf To support userspace audio daemons like Virtual OSS, /dev/sndstat is 
made writeable by the root user. Userspace audio daemons can add or
update an entry in /dev/sndstat by doing a single system write call to
any /dev/sndstat file descriptor handle. When the audio daemon closes the
file handle or is killed the entry disappears.

While at it, cleanup the sound status code a bit:
- keep the device list sorted to avoid sorting the list every time a
  /dev/sndstat read request is made.
- factor out locking into a pair of locking macros.
- use the sound status lock to protect all per file handle states,
  when generating the output for /dev/sndstat and when removing or
  adding sound status devices. This way sndstat_acquire() and
  sndstat_release() become superfluous and can be removed.

Reviewed by:		mav @
Differential Revision:	https://reviews.freebsd.org/D5191
2016-02-09 17:09:14 +00:00

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/*-
* Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
* Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
* Copyright (c) 1995 Hannu Savolainen
* 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.
*
* $FreeBSD$
*/
/*
* first, include kernel header files.
*/
#ifndef _OS_H_
#define _OS_H_
#ifdef _KERNEL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioccom.h>
#include <sys/filio.h>
#include <sys/sockio.h>
#include <sys/fcntl.h>
#include <sys/selinfo.h>
#include <sys/proc.h>
#include <sys/kernel.h> /* for DATA_SET */
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/limits.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <sys/sbuf.h>
#include <sys/soundcard.h>
#include <sys/sysctl.h>
#include <sys/kobj.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#ifndef KOBJMETHOD_END
#define KOBJMETHOD_END { NULL, NULL }
#endif
struct pcm_channel;
struct pcm_feeder;
struct snd_dbuf;
struct snd_mixer;
#include <dev/sound/pcm/buffer.h>
#include <dev/sound/pcm/matrix.h>
#include <dev/sound/pcm/matrix_map.h>
#include <dev/sound/pcm/channel.h>
#include <dev/sound/pcm/feeder.h>
#include <dev/sound/pcm/mixer.h>
#include <dev/sound/pcm/dsp.h>
#include <dev/sound/clone.h>
#include <dev/sound/unit.h>
#define PCM_SOFTC_SIZE (sizeof(struct snddev_info))
#define SND_STATUSLEN 64
#define SOUND_MODVER 5
#define SOUND_MINVER SOUND_MODVER
#define SOUND_PREFVER SOUND_MODVER
#define SOUND_MAXVER SOUND_MODVER
/*
* We're abusing the fact that MAXMINOR still have enough room
* for our bit twiddling and nobody ever need 512 unique soundcards,
* 32 unique device types and 1024 unique cloneable devices for the
* next 100 years...
*/
#define PCMMAXUNIT (snd_max_u())
#define PCMMAXDEV (snd_max_d())
#define PCMMAXCHAN (snd_max_c())
#define PCMMAXCLONE PCMMAXCHAN
#define PCMUNIT(x) (snd_unit2u(dev2unit(x)))
#define PCMDEV(x) (snd_unit2d(dev2unit(x)))
#define PCMCHAN(x) (snd_unit2c(dev2unit(x)))
/* XXX unit2minor compat */
#define PCMMINOR(x) (x)
/*
* By design, limit possible channels for each direction.
*/
#define SND_MAXHWCHAN 256
#define SND_MAXVCHANS SND_MAXHWCHAN
#define SD_F_SIMPLEX 0x00000001
#define SD_F_AUTOVCHAN 0x00000002
#define SD_F_SOFTPCMVOL 0x00000004
/*
* Obsolete due to better matrixing
*/
#if 0
#define SD_F_PSWAPLR 0x00000008
#define SD_F_RSWAPLR 0x00000010
#endif
#define SD_F_DYING 0x00000008
#define SD_F_SUICIDE 0x00000010
#define SD_F_BUSY 0x00000020
#define SD_F_MPSAFE 0x00000040
#define SD_F_REGISTERED 0x00000080
#define SD_F_BITPERFECT 0x00000100
#define SD_F_VPC 0x00000200 /* volume-per-channel */
#define SD_F_EQ 0x00000400 /* EQ */
#define SD_F_EQ_ENABLED 0x00000800 /* EQ enabled */
#define SD_F_EQ_BYPASSED 0x00001000 /* EQ bypassed */
#define SD_F_EQ_PC 0x00002000 /* EQ per-channel */
#define SD_F_EQ_DEFAULT (SD_F_EQ | SD_F_EQ_ENABLED)
#define SD_F_EQ_MASK (SD_F_EQ | SD_F_EQ_ENABLED | \
SD_F_EQ_BYPASSED | SD_F_EQ_PC)
#define SD_F_PRIO_RD 0x10000000
#define SD_F_PRIO_WR 0x20000000
#define SD_F_PRIO_SET (SD_F_PRIO_RD | SD_F_PRIO_WR)
#define SD_F_DIR_SET 0x40000000
#define SD_F_TRANSIENT 0xf0000000
#define SD_F_BITS "\020" \
"\001SIMPLEX" \
"\002AUTOVCHAN" \
"\003SOFTPCMVOL" \
"\004DYING" \
"\005SUICIDE" \
"\006BUSY" \
"\007MPSAFE" \
"\010REGISTERED" \
"\011BITPERFECT" \
"\012VPC" \
"\013EQ" \
"\014EQ_ENABLED" \
"\015EQ_BYPASSED" \
"\016EQ_PC" \
"\035PRIO_RD" \
"\036PRIO_WR" \
"\037DIR_SET"
#define PCM_ALIVE(x) ((x) != NULL && (x)->lock != NULL && \
!((x)->flags & SD_F_DYING))
#define PCM_REGISTERED(x) (PCM_ALIVE(x) && \
((x)->flags & SD_F_REGISTERED))
/* many variables should be reduced to a range. Here define a macro */
#define RANGE(var, low, high) (var) = \
(((var)<(low))? (low) : ((var)>(high))? (high) : (var))
#define DSP_BUFFSIZE (8192)
/* make figuring out what a format is easier. got AFMT_STEREO already */
#define AFMT_32BIT (AFMT_S32_LE | AFMT_S32_BE | AFMT_U32_LE | AFMT_U32_BE)
#define AFMT_24BIT (AFMT_S24_LE | AFMT_S24_BE | AFMT_U24_LE | AFMT_U24_BE)
#define AFMT_16BIT (AFMT_S16_LE | AFMT_S16_BE | AFMT_U16_LE | AFMT_U16_BE)
#define AFMT_G711 (AFMT_MU_LAW | AFMT_A_LAW)
#define AFMT_8BIT (AFMT_G711 | AFMT_U8 | AFMT_S8)
#define AFMT_SIGNED (AFMT_S32_LE | AFMT_S32_BE | AFMT_S24_LE | AFMT_S24_BE | \
AFMT_S16_LE | AFMT_S16_BE | AFMT_S8)
#define AFMT_BIGENDIAN (AFMT_S32_BE | AFMT_U32_BE | AFMT_S24_BE | AFMT_U24_BE | \
AFMT_S16_BE | AFMT_U16_BE)
#define AFMT_CONVERTIBLE (AFMT_8BIT | AFMT_16BIT | AFMT_24BIT | \
AFMT_32BIT)
/* Supported vchan mixing formats */
#define AFMT_VCHAN (AFMT_CONVERTIBLE & ~AFMT_G711)
#define AFMT_PASSTHROUGH AFMT_AC3
#define AFMT_PASSTHROUGH_RATE 48000
#define AFMT_PASSTHROUGH_CHANNEL 2
#define AFMT_PASSTHROUGH_EXTCHANNEL 0
/*
* We're simply using unused, contiguous bits from various AFMT_ definitions.
* ~(0xb00ff7ff)
*/
#define AFMT_ENCODING_MASK 0xf00fffff
#define AFMT_CHANNEL_MASK 0x07f00000
#define AFMT_CHANNEL_SHIFT 20
#define AFMT_CHANNEL_MAX 0x7f
#define AFMT_EXTCHANNEL_MASK 0x08000000
#define AFMT_EXTCHANNEL_SHIFT 27
#define AFMT_EXTCHANNEL_MAX 1
#define AFMT_ENCODING(v) ((v) & AFMT_ENCODING_MASK)
#define AFMT_EXTCHANNEL(v) (((v) & AFMT_EXTCHANNEL_MASK) >> \
AFMT_EXTCHANNEL_SHIFT)
#define AFMT_CHANNEL(v) (((v) & AFMT_CHANNEL_MASK) >> \
AFMT_CHANNEL_SHIFT)
#define AFMT_BIT(v) (((v) & AFMT_32BIT) ? 32 : \
(((v) & AFMT_24BIT) ? 24 : \
((((v) & AFMT_16BIT) || \
((v) & AFMT_PASSTHROUGH)) ? 16 : 8)))
#define AFMT_BPS(v) (AFMT_BIT(v) >> 3)
#define AFMT_ALIGN(v) (AFMT_BPS(v) * AFMT_CHANNEL(v))
#define SND_FORMAT(f, c, e) (AFMT_ENCODING(f) | \
(((c) << AFMT_CHANNEL_SHIFT) & \
AFMT_CHANNEL_MASK) | \
(((e) << AFMT_EXTCHANNEL_SHIFT) & \
AFMT_EXTCHANNEL_MASK))
#define AFMT_U8_NE AFMT_U8
#define AFMT_S8_NE AFMT_S8
#define AFMT_SIGNED_NE (AFMT_S8_NE | AFMT_S16_NE | AFMT_S24_NE | AFMT_S32_NE)
#define AFMT_NE (AFMT_SIGNED_NE | AFMT_U8_NE | AFMT_U16_NE | \
AFMT_U24_NE | AFMT_U32_NE)
/*
* Minor numbers for the sound driver.
*
* Unfortunately Creative called the codec chip of SB as a DSP. For this
* reason the /dev/dsp is reserved for digitized audio use. There is a
* device for true DSP processors but it will be called something else.
* In v3.0 it's /dev/sndproc but this could be a temporary solution.
*/
#define SND_DEV_CTL 0 /* Control port /dev/mixer */
#define SND_DEV_SEQ 1 /* Sequencer /dev/sequencer */
#define SND_DEV_MIDIN 2 /* Raw midi access */
#define SND_DEV_DSP 3 /* Digitized voice /dev/dsp */
#define SND_DEV_AUDIO 4 /* Sparc compatible /dev/audio */
#define SND_DEV_DSP16 5 /* Like /dev/dsp but 16 bits/sample */
#define SND_DEV_STATUS 6 /* /dev/sndstat */
/* #7 not in use now. */
#define SND_DEV_SEQ2 8 /* /dev/sequencer, level 2 interface */
#define SND_DEV_SNDPROC 9 /* /dev/sndproc for programmable devices */
#define SND_DEV_PSS SND_DEV_SNDPROC /* ? */
#define SND_DEV_NORESET 10
#define SND_DEV_DSPHW_PLAY 11 /* specific playback channel */
#define SND_DEV_DSPHW_VPLAY 12 /* specific virtual playback channel */
#define SND_DEV_DSPHW_REC 13 /* specific record channel */
#define SND_DEV_DSPHW_VREC 14 /* specific virtual record channel */
#define SND_DEV_DSPHW_CD 15 /* s16le/stereo 44100Hz CD */
/*
* OSSv4 compatible device. For now, it serve no purpose and
* the cloning itself will forward the request to ordinary /dev/dsp
* instead.
*/
#define SND_DEV_DSP_MMAP 16 /* /dev/dsp_mmap */
#define SND_DEV_DSP_AC3 17 /* /dev/dsp_ac3 */
#define SND_DEV_DSP_MULTICH 18 /* /dev/dsp_multich */
#define SND_DEV_DSP_SPDIFOUT 19 /* /dev/dsp_spdifout */
#define SND_DEV_DSP_SPDIFIN 20 /* /dev/dsp_spdifin */
#define SND_DEV_LAST SND_DEV_DSP_SPDIFIN
#define SND_DEV_MAX PCMMAXDEV
#define DSP_DEFAULT_SPEED 8000
#define ON 1
#define OFF 0
extern int pcm_veto_load;
extern int snd_unit;
extern int snd_maxautovchans;
extern int snd_verbose;
extern devclass_t pcm_devclass;
extern struct unrhdr *pcmsg_unrhdr;
/*
* some macros for debugging purposes
* DDB/DEB to enable/disable debugging stuff
* BVDDB to enable debugging when bootverbose
*/
#define BVDDB(x) if (bootverbose) x
#ifndef DEB
#define DEB(x)
#endif
SYSCTL_DECL(_hw_snd);
int pcm_setvchans(struct snddev_info *d, int direction, int newcnt, int num);
int pcm_chnalloc(struct snddev_info *d, struct pcm_channel **ch, int direction,
pid_t pid, char *comm, int devunit);
int pcm_chnrelease(struct pcm_channel *c);
int pcm_chnref(struct pcm_channel *c, int ref);
int pcm_inprog(struct snddev_info *d, int delta);
struct pcm_channel *pcm_chn_create(struct snddev_info *d, struct pcm_channel *parent, kobj_class_t cls, int dir, int num, void *devinfo);
int pcm_chn_destroy(struct pcm_channel *ch);
int pcm_chn_add(struct snddev_info *d, struct pcm_channel *ch);
int pcm_chn_remove(struct snddev_info *d, struct pcm_channel *ch);
int pcm_addchan(device_t dev, int dir, kobj_class_t cls, void *devinfo);
unsigned int pcm_getbuffersize(device_t dev, unsigned int minbufsz, unsigned int deflt, unsigned int maxbufsz);
int pcm_register(device_t dev, void *devinfo, int numplay, int numrec);
int pcm_unregister(device_t dev);
int pcm_setstatus(device_t dev, char *str);
u_int32_t pcm_getflags(device_t dev);
void pcm_setflags(device_t dev, u_int32_t val);
void *pcm_getdevinfo(device_t dev);
int snd_setup_intr(device_t dev, struct resource *res, int flags,
driver_intr_t hand, void *param, void **cookiep);
void *snd_mtxcreate(const char *desc, const char *type);
void snd_mtxfree(void *m);
void snd_mtxassert(void *m);
#define snd_mtxlock(m) mtx_lock(m)
#define snd_mtxunlock(m) mtx_unlock(m)
typedef int (*sndstat_handler)(struct sbuf *s, device_t dev, int verbose);
int sndstat_register(device_t dev, char *str, sndstat_handler handler);
int sndstat_registerfile(char *str);
int sndstat_unregister(device_t dev);
int sndstat_unregisterfile(char *str);
#define SND_DECLARE_FILE(version) \
_SND_DECLARE_FILE(__LINE__, version)
#define _SND_DECLARE_FILE(uniq, version) \
__SND_DECLARE_FILE(uniq, version)
#define __SND_DECLARE_FILE(uniq, version) \
static char sndstat_vinfo[] = version; \
SYSINIT(sdf_ ## uniq, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, sndstat_registerfile, sndstat_vinfo); \
SYSUNINIT(sdf_ ## uniq, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, sndstat_unregisterfile, sndstat_vinfo);
/* usage of flags in device config entry (config file) */
#define DV_F_DRQ_MASK 0x00000007 /* mask for secondary drq */
#define DV_F_DUAL_DMA 0x00000010 /* set to use secondary dma channel */
/* ought to be made obsolete but still used by mss */
#define DV_F_DEV_MASK 0x0000ff00 /* force device type/class */
#define DV_F_DEV_SHIFT 8 /* force device type/class */
/*
* this is rather kludgey- we need to duplicate these struct def'ns from sound.c
* so that the macro versions of pcm_{,un}lock can dereference them.
* we also have to do this now makedev() has gone away.
*/
struct snddev_info {
struct {
struct {
SLIST_HEAD(, pcm_channel) head;
struct {
SLIST_HEAD(, pcm_channel) head;
} busy;
struct {
SLIST_HEAD(, pcm_channel) head;
} opened;
} pcm;
} channels;
TAILQ_HEAD(dsp_cdevinfo_linkhead, dsp_cdevinfo) dsp_cdevinfo_pool;
struct snd_clone *clones;
unsigned devcount, playcount, reccount, pvchancount, rvchancount ;
unsigned flags;
int inprog;
unsigned int bufsz;
void *devinfo;
device_t dev;
char status[SND_STATUSLEN];
struct mtx *lock;
struct cdev *mixer_dev;
uint32_t pvchanrate, pvchanformat;
uint32_t rvchanrate, rvchanformat;
int32_t eqpreamp;
struct sysctl_ctx_list play_sysctl_ctx, rec_sysctl_ctx;
struct sysctl_oid *play_sysctl_tree, *rec_sysctl_tree;
struct cv cv;
};
void sound_oss_sysinfo(oss_sysinfo *);
int sound_oss_card_info(oss_card_info *);
#define PCM_LOCKOWNED(d) mtx_owned((d)->lock)
#define PCM_LOCK(d) mtx_lock((d)->lock)
#define PCM_UNLOCK(d) mtx_unlock((d)->lock)
#define PCM_TRYLOCK(d) mtx_trylock((d)->lock)
#define PCM_LOCKASSERT(d) mtx_assert((d)->lock, MA_OWNED)
#define PCM_UNLOCKASSERT(d) mtx_assert((d)->lock, MA_NOTOWNED)
/*
* For PCM_[WAIT | ACQUIRE | RELEASE], be sure to surround these
* with PCM_LOCK/UNLOCK() sequence, or I'll come to gnaw upon you!
*/
#ifdef SND_DIAGNOSTIC
#define PCM_WAIT(x) do { \
if (!PCM_LOCKOWNED(x)) \
panic("%s(%d): [PCM WAIT] Mutex not owned!", \
__func__, __LINE__); \
while ((x)->flags & SD_F_BUSY) { \
if (snd_verbose > 3) \
device_printf((x)->dev, \
"%s(%d): [PCM WAIT] calling cv_wait().\n", \
__func__, __LINE__); \
cv_wait(&(x)->cv, (x)->lock); \
} \
} while (0)
#define PCM_ACQUIRE(x) do { \
if (!PCM_LOCKOWNED(x)) \
panic("%s(%d): [PCM ACQUIRE] Mutex not owned!", \
__func__, __LINE__); \
if ((x)->flags & SD_F_BUSY) \
panic("%s(%d): [PCM ACQUIRE] " \
"Trying to acquire BUSY cv!", __func__, __LINE__); \
(x)->flags |= SD_F_BUSY; \
} while (0)
#define PCM_RELEASE(x) do { \
if (!PCM_LOCKOWNED(x)) \
panic("%s(%d): [PCM RELEASE] Mutex not owned!", \
__func__, __LINE__); \
if ((x)->flags & SD_F_BUSY) { \
(x)->flags &= ~SD_F_BUSY; \
if ((x)->cv.cv_waiters != 0) { \
if ((x)->cv.cv_waiters > 1 && snd_verbose > 3) \
device_printf((x)->dev, \
"%s(%d): [PCM RELEASE] " \
"cv_waiters=%d > 1!\n", \
__func__, __LINE__, \
(x)->cv.cv_waiters); \
cv_broadcast(&(x)->cv); \
} \
} else \
panic("%s(%d): [PCM RELEASE] Releasing non-BUSY cv!", \
__func__, __LINE__); \
} while (0)
/* Quick version, for shorter path. */
#define PCM_ACQUIRE_QUICK(x) do { \
if (PCM_LOCKOWNED(x)) \
panic("%s(%d): [PCM ACQUIRE QUICK] Mutex owned!", \
__func__, __LINE__); \
PCM_LOCK(x); \
PCM_WAIT(x); \
PCM_ACQUIRE(x); \
PCM_UNLOCK(x); \
} while (0)
#define PCM_RELEASE_QUICK(x) do { \
if (PCM_LOCKOWNED(x)) \
panic("%s(%d): [PCM RELEASE QUICK] Mutex owned!", \
__func__, __LINE__); \
PCM_LOCK(x); \
PCM_RELEASE(x); \
PCM_UNLOCK(x); \
} while (0)
#define PCM_BUSYASSERT(x) do { \
if (!((x) != NULL && ((x)->flags & SD_F_BUSY))) \
panic("%s(%d): [PCM BUSYASSERT] " \
"Failed, snddev_info=%p", __func__, __LINE__, x); \
} while (0)
#define PCM_GIANT_ENTER(x) do { \
int _pcm_giant = 0; \
if (PCM_LOCKOWNED(x)) \
panic("%s(%d): [GIANT ENTER] PCM lock owned!", \
__func__, __LINE__); \
if (mtx_owned(&Giant) != 0 && snd_verbose > 3) \
device_printf((x)->dev, \
"%s(%d): [GIANT ENTER] Giant owned!\n", \
__func__, __LINE__); \
if (!((x)->flags & SD_F_MPSAFE) && mtx_owned(&Giant) == 0) \
do { \
mtx_lock(&Giant); \
_pcm_giant = 1; \
} while (0)
#define PCM_GIANT_EXIT(x) do { \
if (PCM_LOCKOWNED(x)) \
panic("%s(%d): [GIANT EXIT] PCM lock owned!", \
__func__, __LINE__); \
if (!(_pcm_giant == 0 || _pcm_giant == 1)) \
panic("%s(%d): [GIANT EXIT] _pcm_giant screwed!", \
__func__, __LINE__); \
if ((x)->flags & SD_F_MPSAFE) { \
if (_pcm_giant == 1) \
panic("%s(%d): [GIANT EXIT] MPSAFE Giant?", \
__func__, __LINE__); \
if (mtx_owned(&Giant) != 0 && snd_verbose > 3) \
device_printf((x)->dev, \
"%s(%d): [GIANT EXIT] Giant owned!\n", \
__func__, __LINE__); \
} \
if (_pcm_giant != 0) { \
if (mtx_owned(&Giant) == 0) \
panic("%s(%d): [GIANT EXIT] Giant not owned!", \
__func__, __LINE__); \
_pcm_giant = 0; \
mtx_unlock(&Giant); \
} \
} while (0)
#else /* SND_DIAGNOSTIC */
#define PCM_WAIT(x) do { \
PCM_LOCKASSERT(x); \
while ((x)->flags & SD_F_BUSY) \
cv_wait(&(x)->cv, (x)->lock); \
} while (0)
#define PCM_ACQUIRE(x) do { \
PCM_LOCKASSERT(x); \
KASSERT(!((x)->flags & SD_F_BUSY), \
("%s(%d): [PCM ACQUIRE] Trying to acquire BUSY cv!", \
__func__, __LINE__)); \
(x)->flags |= SD_F_BUSY; \
} while (0)
#define PCM_RELEASE(x) do { \
PCM_LOCKASSERT(x); \
KASSERT((x)->flags & SD_F_BUSY, \
("%s(%d): [PCM RELEASE] Releasing non-BUSY cv!", \
__func__, __LINE__)); \
(x)->flags &= ~SD_F_BUSY; \
if ((x)->cv.cv_waiters != 0) \
cv_broadcast(&(x)->cv); \
} while (0)
/* Quick version, for shorter path. */
#define PCM_ACQUIRE_QUICK(x) do { \
PCM_UNLOCKASSERT(x); \
PCM_LOCK(x); \
PCM_WAIT(x); \
PCM_ACQUIRE(x); \
PCM_UNLOCK(x); \
} while (0)
#define PCM_RELEASE_QUICK(x) do { \
PCM_UNLOCKASSERT(x); \
PCM_LOCK(x); \
PCM_RELEASE(x); \
PCM_UNLOCK(x); \
} while (0)
#define PCM_BUSYASSERT(x) KASSERT(x != NULL && \
((x)->flags & SD_F_BUSY), \
("%s(%d): [PCM BUSYASSERT] " \
"Failed, snddev_info=%p", \
__func__, __LINE__, x))
#define PCM_GIANT_ENTER(x) do { \
int _pcm_giant = 0; \
PCM_UNLOCKASSERT(x); \
if (!((x)->flags & SD_F_MPSAFE) && mtx_owned(&Giant) == 0) \
do { \
mtx_lock(&Giant); \
_pcm_giant = 1; \
} while (0)
#define PCM_GIANT_EXIT(x) do { \
PCM_UNLOCKASSERT(x); \
KASSERT(_pcm_giant == 0 || _pcm_giant == 1, \
("%s(%d): [GIANT EXIT] _pcm_giant screwed!", \
__func__, __LINE__)); \
KASSERT(!((x)->flags & SD_F_MPSAFE) || \
(((x)->flags & SD_F_MPSAFE) && _pcm_giant == 0), \
("%s(%d): [GIANT EXIT] MPSAFE Giant?", \
__func__, __LINE__)); \
if (_pcm_giant != 0) { \
mtx_assert(&Giant, MA_OWNED); \
_pcm_giant = 0; \
mtx_unlock(&Giant); \
} \
} while (0)
#endif /* !SND_DIAGNOSTIC */
#define PCM_GIANT_LEAVE(x) \
PCM_GIANT_EXIT(x); \
} while (0)
#ifdef KLD_MODULE
#define PCM_KLDSTRING(a) ("kld " # a)
#else
#define PCM_KLDSTRING(a) ""
#endif
#endif /* _KERNEL */
#endif /* _OS_H_ */
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