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freebsd-skq/sys/dev/sound/pcm/channel.h
Ariff Abdullah e4e61333ff Last (again ?!?) major commit for RELENG_7, featuring total Giant 
eradication in/from userland path, countless locking fixes, etc.

- General sleep call through msleep(9) has been converted to condvar(9)
  with better consistencies.
- Heavily guard every possible "slow path" entries (open(), close(),
  few ioctl()s, sysctls), but once it entering "fast path" (io, interrupt
  started), they are free to fly on their own.
- Rearrange locking sequences, resulting better concurrency and
  serialization. Large part doesn't even need locking at all, and will be
  removed in future. Less clutter, except in few places due to lock
  ordering.
- Anonymous mixer object creation/deletion to simplify mixer handling
  beyond typical mixer ioctls.
  Submitted by:		chibis (with modifications)
- Add few mix_[get|set|..] functions to avoid calling mixer_ioctl()
  directly using cryptic arguments.
- Locking fixes to avoid possible deadlock with (still under Giant) USB.
- Better simplex/duplex device handling.
- Recover mmap() functionality for recording, which has been lost
  since 2.2.x - 3.x (the introduction of newpcm). Full-duplex mmap still
  doesn't work (due to VM/page design), but people still can mmap
  both by opening each direction separately. mmaped playback is guarantee
  to work either way.
- New sysctl: "hw.snd.compat_linux_mmap" to allow PROT_EXEC page
  mapping, due to recent changes in linux compatibility layer which
  require it. All linux applications that using sound + mmap() (mostly games)
  require this to be enabled. Disabled by default.
- Other goodies.. too many, that will increase releng7 shareholder value
  and make users of releng6 (and below) cry ;)

* This commit should be atomic. If anything goes wrong (not counting problem
  originated from elsewhere), I will not hesitate to revert everything back
  within 12 hours. This substantial changes itself not a rocket science
  and the process has begun for almost 2 years, and lots of incremental
  changes are already in place during that period of time.
* Some issues does occur in snd_emu10kx (note the 'x') due to various
  internal locking issues and it is currently being worked on by chibis.

Tested by:	chibis (Yuriy Tsibizov), joel, Alexandre Vieira,
          	many innocent souls...
2007-06-16 03:37:28 +00:00

377 lines
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/*-
* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
* 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.
*
* $FreeBSD$
*/
struct pcmchan_caps {
u_int32_t minspeed, maxspeed;
u_int32_t *fmtlist;
u_int32_t caps;
};
/* Forward declarations */
struct pcm_channel;
struct pcmchan_syncgroup;
struct pcmchan_syncmember;
extern struct mtx snd_pcm_syncgroups_mtx;
extern SLIST_HEAD(pcm_synclist, pcmchan_syncgroup) snd_pcm_syncgroups;
#define PCM_SG_LOCK() mtx_lock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_TRYLOCK() mtx_trylock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_UNLOCK() mtx_unlock(&snd_pcm_syncgroups_mtx)
#define PCM_SG_LOCKASSERT(arg) mtx_assert(&snd_pcm_syncgroups_mtx, arg)
/**
* @brief Specifies an audio device sync group
*/
struct pcmchan_syncgroup {
SLIST_ENTRY(pcmchan_syncgroup) link;
SLIST_HEAD(, pcmchan_syncmember) members;
int id; /**< Group identifier; set to address of group. */
};
/**
* @brief Specifies a container for members of a sync group
*/
struct pcmchan_syncmember {
SLIST_ENTRY(pcmchan_syncmember) link;
struct pcmchan_syncgroup *parent; /**< group head */
struct pcm_channel *ch;
};
#define CHN_NAMELEN 32
struct pcm_channel {
kobj_t methods;
pid_t pid;
int refcount;
struct pcm_feeder *feeder;
u_int32_t align;
int volume;
int latency;
u_int32_t speed;
u_int32_t format;
u_int32_t flags;
u_int32_t feederflags;
u_int32_t blocks;
int direction;
unsigned int interrupts, xruns, feedcount;
unsigned int timeout;
struct snd_dbuf *bufhard, *bufsoft;
struct snddev_info *parentsnddev;
struct pcm_channel *parentchannel;
void *devinfo;
device_t dev;
int unit;
char name[CHN_NAMELEN];
struct mtx *lock;
int trigger;
/**
* For interrupt manipulations.
*/
struct cv intr_cv;
/**
* Increment,decrement this around operations that temporarily yield
* lock.
*/
unsigned int inprog;
/**
* Special channel operations should examine @c inprog after acquiring
* lock. If zero, operations may continue. Else, thread should
* wait on this cv for previous operation to finish.
*/
struct cv cv;
/**
* Low water mark for select()/poll().
*
* This is initialized to the channel's fragment size, and will be
* overwritten if a new fragment size is set. Users may alter this
* value directly with the @c SNDCTL_DSP_LOW_WATER ioctl.
*/
unsigned int lw;
/**
* If part of a sync group, this will point to the syncmember
* container.
*/
struct pcmchan_syncmember *sm;
#ifdef OSSV4_EXPERIMENT
u_int16_t lpeak, rpeak; /**< Peak value from 0-32767. */
#endif
struct {
SLIST_HEAD(, pcm_channel) head;
SLIST_ENTRY(pcm_channel) link;
struct {
SLIST_HEAD(, pcm_channel) head;
SLIST_ENTRY(pcm_channel) link;
} busy;
} children;
struct {
struct {
SLIST_ENTRY(pcm_channel) link;
struct {
SLIST_ENTRY(pcm_channel) link;
} busy;
} pcm;
} channels;
void *data1, *data2;
};
#define CHN_HEAD(x, y) &(x)->y.head
#define CHN_INIT(x, y) SLIST_INIT(CHN_HEAD(x, y))
#define CHN_LINK(y) y.link
#define CHN_EMPTY(x, y) SLIST_EMPTY(CHN_HEAD(x, y))
#define CHN_FIRST(x, y) SLIST_FIRST(CHN_HEAD(x, y))
#define CHN_FOREACH(x, y, z) \
SLIST_FOREACH(x, CHN_HEAD(y, z), CHN_LINK(z))
#define CHN_FOREACH_SAFE(w, x, y, z) \
SLIST_FOREACH_SAFE(w, CHN_HEAD(x, z), CHN_LINK(z), y)
#define CHN_INSERT_HEAD(x, y, z) \
SLIST_INSERT_HEAD(CHN_HEAD(x, z), y, CHN_LINK(z))
#define CHN_INSERT_AFTER(x, y, z) \
SLIST_INSERT_AFTER(x, y, CHN_LINK(z))
#define CHN_REMOVE(x, y, z) \
SLIST_REMOVE(CHN_HEAD(x, z), y, pcm_channel, CHN_LINK(z))
#define CHN_INSERT_HEAD_SAFE(x, y, z) do { \
struct pcm_channel *t = NULL; \
CHN_FOREACH(t, x, z) { \
if (t == y) \
break; \
} \
if (t != y) { \
CHN_INSERT_HEAD(x, y, z); \
} \
} while(0)
#define CHN_INSERT_AFTER_SAFE(w, x, y, z) do { \
struct pcm_channel *t = NULL; \
CHN_FOREACH(t, w, z) { \
if (t == y) \
break; \
} \
if (t != y) { \
CHN_INSERT_AFTER(x, y, z); \
} \
} while(0)
#define CHN_REMOVE_SAFE(x, y, z) do { \
struct pcm_channel *t = NULL; \
CHN_FOREACH(t, x, z) { \
if (t == y) \
break; \
} \
if (t == y) { \
CHN_REMOVE(x, y, z); \
} \
} while(0)
#define CHN_UNIT(x) (snd_unit2u((x)->unit))
#define CHN_DEV(x) (snd_unit2d((x)->unit))
#define CHN_CHAN(x) (snd_unit2c((x)->unit))
#define CHN_BUF_PARENT(x, y) \
(((x) != NULL && (x)->parentchannel != NULL && \
(x)->parentchannel->bufhard != NULL) ? \
(x)->parentchannel->bufhard : (y))
#define CHN_BROADCAST(x) do { \
if ((x)->cv_waiters != 0) \
cv_broadcastpri(x, PRIBIO); \
} while(0)
#include "channel_if.h"
int chn_reinit(struct pcm_channel *c);
int chn_write(struct pcm_channel *c, struct uio *buf);
int chn_read(struct pcm_channel *c, struct uio *buf);
u_int32_t chn_start(struct pcm_channel *c, int force);
int chn_sync(struct pcm_channel *c, int threshold);
int chn_flush(struct pcm_channel *c);
int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
int chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction);
int chn_kill(struct pcm_channel *c);
int chn_setdir(struct pcm_channel *c, int dir);
int chn_reset(struct pcm_channel *c, u_int32_t fmt);
int chn_setvolume(struct pcm_channel *c, int left, int right);
int chn_setspeed(struct pcm_channel *c, int speed);
int chn_setformat(struct pcm_channel *c, u_int32_t fmt);
int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
int chn_setlatency(struct pcm_channel *c, int latency);
int chn_trigger(struct pcm_channel *c, int go);
int chn_getptr(struct pcm_channel *c);
struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
u_int32_t chn_getformats(struct pcm_channel *c);
void chn_resetbuf(struct pcm_channel *c);
void chn_intr(struct pcm_channel *c);
int chn_wrfeed(struct pcm_channel *c);
int chn_rdfeed(struct pcm_channel *c);
int chn_abort(struct pcm_channel *c);
void chn_wrupdate(struct pcm_channel *c);
void chn_rdupdate(struct pcm_channel *c);
int chn_notify(struct pcm_channel *c, u_int32_t flags);
void chn_lock(struct pcm_channel *c);
void chn_unlock(struct pcm_channel *c);
int chn_getrates(struct pcm_channel *c, int **rates);
int chn_syncdestroy(struct pcm_channel *c);
#ifdef OSSV4_EXPERIMENT
int chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak);
#endif
#ifdef USING_MUTEX
#define CHN_LOCK(c) mtx_lock((struct mtx *)((c)->lock))
#define CHN_UNLOCK(c) mtx_unlock((struct mtx *)((c)->lock))
#define CHN_TRYLOCK(c) mtx_trylock((struct mtx *)((c)->lock))
#define CHN_LOCKASSERT(c) mtx_assert((struct mtx *)((c)->lock), MA_OWNED)
#else
#define CHN_LOCK(c)
#define CHN_UNLOCK(c)
#define CHN_TRYLOCK(c)
#define CHN_LOCKASSERT(c)
#endif
int fmtvalid(u_int32_t fmt, u_int32_t *fmtlist);
#define AFMTSTR_NONE 0 /* "s16le" */
#define AFMTSTR_SIMPLE 1 /* "s16le:s" */
#define AFMTSTR_NUM 2 /* "s16le:2" */
#define AFMTSTR_FULL 3 /* "s16le:stereo" */
#define AFMTSTR_MAXSZ 13 /* include null terminator */
#define AFMTSTR_MONO_RETURN 0
#define AFMTSTR_STEREO_RETURN 1
struct afmtstr_table {
char *fmtstr;
u_int32_t format;
};
int afmtstr_swap_sign(char *);
int afmtstr_swap_endian(char *);
u_int32_t afmtstr2afmt(struct afmtstr_table *, const char *, int);
u_int32_t afmt2afmtstr(struct afmtstr_table *, u_int32_t, char *, size_t, int, int);
extern int chn_latency;
extern int chn_latency_profile;
extern int report_soft_formats;
#define PCMDIR_FAKE 0
#define PCMDIR_PLAY 1
#define PCMDIR_PLAY_VIRTUAL 2
#define PCMDIR_REC -1
#define PCMDIR_REC_VIRTUAL -2
#define PCMTRIG_START 1
#define PCMTRIG_EMLDMAWR 2
#define PCMTRIG_EMLDMARD 3
#define PCMTRIG_STOP 0
#define PCMTRIG_ABORT -1
#define PCMTRIG_COMMON(x) ((x) == PCMTRIG_START || \
(x) == PCMTRIG_STOP || \
(x) == PCMTRIG_ABORT)
#define CHN_F_CLOSING 0x00000004 /* a pending close */
#define CHN_F_ABORTING 0x00000008 /* a pending abort */
#define CHN_F_RUNNING 0x00000010 /* dma is running */
#define CHN_F_TRIGGERED 0x00000020
#define CHN_F_NOTRIGGER 0x00000040
#define CHN_F_SLEEPING 0x00000080
#define CHN_F_BUSY 0x00001000 /* has been opened */
#define CHN_F_HAS_SIZE 0x00002000 /* user set block size */
#define CHN_F_NBIO 0x00004000 /* do non-blocking i/o */
#define CHN_F_MAPPED 0x00010000 /* has been mmap()ed */
#define CHN_F_DEAD 0x00020000
#define CHN_F_BADSETTING 0x00040000
#define CHN_F_SETBLOCKSIZE 0x00080000
#define CHN_F_HAS_VCHAN 0x00100000
#define CHN_F_VIRTUAL 0x10000000 /* not backed by hardware */
#define CHN_F_RESET (CHN_F_BUSY | CHN_F_DEAD | \
CHN_F_HAS_VCHAN | CHN_F_VIRTUAL)
#define CHN_F_MMAP_INVALID (CHN_F_DEAD | CHN_F_RUNNING)
#define CHN_N_RATE 0x00000001
#define CHN_N_FORMAT 0x00000002
#define CHN_N_VOLUME 0x00000004
#define CHN_N_BLOCKSIZE 0x00000008
#define CHN_N_TRIGGER 0x00000010
#define CHN_LATENCY_MIN 0
#define CHN_LATENCY_MAX 10
#define CHN_LATENCY_DEFAULT 5
#define CHN_POLICY_MIN CHN_LATENCY_MIN
#define CHN_POLICY_MAX CHN_LATENCY_MAX
#define CHN_POLICY_DEFAULT CHN_LATENCY_DEFAULT
#define CHN_LATENCY_PROFILE_MIN 0
#define CHN_LATENCY_PROFILE_MAX 1
#define CHN_LATENCY_PROFILE_DEFAULT CHN_LATENCY_PROFILE_MAX
#define CHN_STARTED(c) ((c)->flags & CHN_F_TRIGGERED)
#define CHN_STOPPED(c) (!CHN_STARTED(c))
#define CHN_DIRSTR(c) (((c)->direction == PCMDIR_PLAY) ? \
"PCMDIR_PLAY" : "PCMDIR_REC")
#define CHN_TIMEOUT 5
#define CHN_TIMEOUT_MIN 1
#define CHN_TIMEOUT_MAX 10
/*
* This should be large enough to hold all pcm data between
* tsleeps in chn_{read,write} at the highest sample rate.
* (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
*/
#define CHN_2NDBUFBLKSIZE (2 * 1024)
/* The total number of blocks per secondary bufhard. */
#define CHN_2NDBUFBLKNUM (32)
/* The size of a whole secondary bufhard. */
#define CHN_2NDBUFMAXSIZE (131072)
#define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))
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