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/buffer.c

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    1 /*-
    2  * Copyright (c) 1999 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  * $FreeBSD: src/sys/dev/sound/pcm/buffer.c,v 1.25.2.3 2007/04/26 08:21:43 ariff Exp $
   27  */
   28 
   29 #include <dev/sound/pcm/sound.h>
   30 
   31 #include "feeder_if.h"
   32 
   33 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/buffer.c,v 1.11 2008/01/06 16:55:51 swildner Exp $");
   34 
   35 /*
   36  * XXX
   37  *
   38  * sndbuf_kqtask is a taskqueue callback routine, called from
   39  * taskqueue_swi, which runs under the MP lock.
   40  *
   41  * The only purpose is to be able to KNOTE() from a sound
   42  * interrupt, which is running without MP lock held and thus
   43  * can't call KNOTE() directly.
   44  */
   45 static void
   46 sndbuf_kqtask(void *context, int pending)
   47 {
   48         struct snd_dbuf *b = context;
   49         struct kqinfo *ki = sndbuf_getkq(b);
   50 
   51         KNOTE(&ki->ki_note, 0);
   52 }
   53 
   54 struct snd_dbuf *
   55 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
   56 {
   57         struct snd_dbuf *b;
   58 
   59         b = kmalloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
   60         ksnprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
   61         b->dev = dev;
   62         b->channel = channel;
   63         TASK_INIT(&b->kqtask, 0, sndbuf_kqtask, b);
   64 
   65         return b;
   66 }
   67 
   68 void
   69 sndbuf_destroy(struct snd_dbuf *b)
   70 {
   71         sndbuf_free(b);
   72         kfree(b, M_DEVBUF);
   73 }
   74 
   75 bus_addr_t
   76 sndbuf_getbufaddr(struct snd_dbuf *buf)
   77 {
   78         return (buf->buf_addr);
   79 }
   80 
   81 static void
   82 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   83 {
   84         struct snd_dbuf *b = (struct snd_dbuf *)arg;
   85 
   86         if (bootverbose) {
   87                 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
   88                     (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
   89                 kprintf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
   90         }
   91         if (error == 0)
   92                 b->buf_addr = segs[0].ds_addr;
   93         else
   94                 b->buf_addr = 0;
   95 }
   96 
   97 /*
   98  * Allocate memory for DMA buffer. If the device does not use DMA transfers,
   99  * the driver can call kmalloc(9) and sndbuf_setup() itself.
  100  */
  101 
  102 int
  103 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
  104 {
  105         int ret;
  106 
  107         b->dmatag = dmatag;
  108         b->maxsize = size;
  109         b->bufsize = b->maxsize;
  110         b->buf_addr = 0;
  111         b->flags |= SNDBUF_F_MANAGED;
  112         if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT,
  113             &b->dmamap)) {
  114                 sndbuf_free(b);
  115                 return (ENOMEM);
  116         }
  117         if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
  118             sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
  119                 sndbuf_free(b);
  120                 return (ENOMEM);
  121         }
  122 
  123         ret = sndbuf_resize(b, 2, b->maxsize / 2);
  124         if (ret != 0)
  125                 sndbuf_free(b);
  126 
  127         return (ret);
  128 }
  129 
  130 int
  131 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
  132 {
  133         b->flags &= ~SNDBUF_F_MANAGED;
  134         if (buf)
  135                 b->flags |= SNDBUF_F_MANAGED;
  136         b->buf = buf;
  137         b->maxsize = size;
  138         b->bufsize = b->maxsize;
  139         return sndbuf_resize(b, 2, b->maxsize / 2);
  140 }
  141 
  142 void
  143 sndbuf_free(struct snd_dbuf *b)
  144 {
  145         if (b->tmpbuf)
  146                 kfree(b->tmpbuf, M_DEVBUF);
  147         if (b->buf) {
  148                 if (b->flags & SNDBUF_F_MANAGED) {
  149                         if (b->dmamap)
  150                                 bus_dmamap_unload(b->dmatag, b->dmamap);
  151                         if (b->dmatag)
  152                                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
  153                 } else
  154                         kfree(b->buf, M_DEVBUF);
  155         }
  156 
  157         b->tmpbuf = NULL;
  158         b->buf = NULL;
  159         b->dmatag = NULL;
  160         b->dmamap = NULL;
  161 }
  162 
  163 int
  164 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  165 {
  166         u_int8_t *tmpbuf, *f2;
  167 
  168         chn_lock(b->channel);
  169         if (b->maxsize == 0)
  170                 goto out;
  171         if (blkcnt == 0)
  172                 blkcnt = b->blkcnt;
  173         if (blksz == 0)
  174                 blksz = b->blksz;
  175         if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
  176                 chn_unlock(b->channel);
  177                 return EINVAL;
  178         }
  179         if (blkcnt == b->blkcnt && blksz == b->blksz)
  180                 goto out;
  181 
  182         chn_unlock(b->channel);
  183         tmpbuf = kmalloc(blkcnt * blksz, M_DEVBUF, M_WAITOK);
  184         chn_lock(b->channel);
  185         b->blkcnt = blkcnt;
  186         b->blksz = blksz;
  187         b->bufsize = blkcnt * blksz;
  188         f2 =  b->tmpbuf;
  189         b->tmpbuf = tmpbuf;
  190         sndbuf_reset(b);
  191         chn_unlock(b->channel);
  192         if (f2 != NULL)
  193                 kfree(f2, M_DEVBUF);
  194         return 0;
  195 out:
  196         chn_unlock(b->channel);
  197         return 0;
  198 }
  199 
  200 int
  201 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  202 {
  203         u_int8_t *buf, *tmpbuf, *f1, *f2;
  204         unsigned int bufsize;
  205         int ret;
  206 
  207         if (blkcnt < 2 || blksz < 16)
  208                 return EINVAL;
  209 
  210         bufsize = blksz * blkcnt;
  211 
  212         chn_unlock(b->channel);
  213         buf = kmalloc(bufsize, M_DEVBUF, M_WAITOK);
  214         tmpbuf = kmalloc(bufsize, M_DEVBUF, M_WAITOK);
  215         chn_lock(b->channel);
  216 
  217         b->blkcnt = blkcnt;
  218         b->blksz = blksz;
  219         b->bufsize = bufsize;
  220         b->maxsize = bufsize;
  221         f1 = b->buf;
  222         f2 = b->tmpbuf;
  223         b->buf = buf;
  224         b->tmpbuf = tmpbuf;
  225 
  226         sndbuf_reset(b);
  227 
  228         chn_unlock(b->channel);
  229         if (f1)
  230                 kfree(f1, M_DEVBUF);
  231         if (f2)
  232                 kfree(f2, M_DEVBUF);
  233 
  234         ret = 0;
  235         chn_lock(b->channel);
  236         return ret;
  237 }
  238 
  239 void
  240 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
  241 {
  242         int i;
  243         u_char data, *p;
  244 
  245         if (length == 0)
  246                 return;
  247         if (length > b->bufsize)
  248                 length = b->bufsize;
  249 
  250         if (b->fmt & AFMT_SIGNED)
  251                 data = 0x00;
  252         else
  253                 data = 0x80;
  254 
  255         i = sndbuf_getfreeptr(b);
  256         p = sndbuf_getbuf(b);
  257         while (length > 0) {
  258                 p[i] = data;
  259                 length--;
  260                 i++;
  261                 if (i >= b->bufsize)
  262                         i = 0;
  263         }
  264 }
  265 
  266 void
  267 sndbuf_fillsilence(struct snd_dbuf *b)
  268 {
  269         int i;
  270         u_char data, *p;
  271 
  272         if (b->fmt & AFMT_SIGNED)
  273                 data = 0x00;
  274         else
  275                 data = 0x80;
  276 
  277         i = 0;
  278         p = sndbuf_getbuf(b);
  279         while (i < b->bufsize)
  280                 p[i++] = data;
  281         b->rp = 0;
  282         b->rl = b->bufsize;
  283 }
  284 
  285 void
  286 sndbuf_reset(struct snd_dbuf *b)
  287 {
  288         b->hp = 0;
  289         b->rp = 0;
  290         b->rl = 0;
  291         b->dl = 0;
  292         b->prev_total = 0;
  293         b->total = 0;
  294         b->xrun = 0;
  295         if (b->buf && b->bufsize > 0)
  296                 sndbuf_clear(b, b->bufsize);
  297 }
  298 
  299 u_int32_t
  300 sndbuf_getfmt(struct snd_dbuf *b)
  301 {
  302         return b->fmt;
  303 }
  304 
  305 int
  306 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
  307 {
  308         b->fmt = fmt;
  309         b->bps = 1;
  310         b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
  311         if (b->fmt & AFMT_16BIT)
  312                 b->bps <<= 1;
  313         else if (b->fmt & AFMT_24BIT)
  314                 b->bps *= 3;
  315         else if (b->fmt & AFMT_32BIT)
  316                 b->bps <<= 2;
  317         return 0;
  318 }
  319 
  320 unsigned int
  321 sndbuf_getspd(struct snd_dbuf *b)
  322 {
  323         return b->spd;
  324 }
  325 
  326 void
  327 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
  328 {
  329         b->spd = spd;
  330 }
  331 
  332 unsigned int
  333 sndbuf_getalign(struct snd_dbuf *b)
  334 {
  335         static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
  336 
  337         return align[b->bps - 1];
  338 }
  339 
  340 unsigned int
  341 sndbuf_getblkcnt(struct snd_dbuf *b)
  342 {
  343         return b->blkcnt;
  344 }
  345 
  346 void
  347 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
  348 {
  349         b->blkcnt = blkcnt;
  350 }
  351 
  352 unsigned int
  353 sndbuf_getblksz(struct snd_dbuf *b)
  354 {
  355         return b->blksz;
  356 }
  357 
  358 void
  359 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
  360 {
  361         b->blksz = blksz;
  362 }
  363 
  364 unsigned int
  365 sndbuf_getbps(struct snd_dbuf *b)
  366 {
  367         return b->bps;
  368 }
  369 
  370 void *
  371 sndbuf_getbuf(struct snd_dbuf *b)
  372 {
  373         return b->buf;
  374 }
  375 
  376 void *
  377 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
  378 {
  379         KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
  380 
  381         return b->buf + ofs;
  382 }
  383 
  384 unsigned int
  385 sndbuf_getsize(struct snd_dbuf *b)
  386 {
  387         return b->bufsize;
  388 }
  389 
  390 unsigned int
  391 sndbuf_getmaxsize(struct snd_dbuf *b)
  392 {
  393         return b->maxsize;
  394 }
  395 
  396 unsigned int
  397 sndbuf_runsz(struct snd_dbuf *b)
  398 {
  399         return b->dl;
  400 }
  401 
  402 void
  403 sndbuf_setrun(struct snd_dbuf *b, int go)
  404 {
  405         b->dl = go? b->blksz : 0;
  406 }
  407 
  408 struct kqinfo *
  409 sndbuf_getkq(struct snd_dbuf *b)
  410 {
  411         return &b->kq;
  412 }
  413 
  414 /************************************************************/
  415 unsigned int
  416 sndbuf_getxrun(struct snd_dbuf *b)
  417 {
  418         SNDBUF_LOCKASSERT(b);
  419 
  420         return b->xrun;
  421 }
  422 
  423 void
  424 sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
  425 {
  426         SNDBUF_LOCKASSERT(b);
  427 
  428         b->xrun = cnt;
  429 }
  430 
  431 unsigned int
  432 sndbuf_gethwptr(struct snd_dbuf *b)
  433 {
  434         SNDBUF_LOCKASSERT(b);
  435 
  436         return b->hp;
  437 }
  438 
  439 void
  440 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
  441 {
  442         SNDBUF_LOCKASSERT(b);
  443 
  444         b->hp = ptr;
  445 }
  446 
  447 unsigned int
  448 sndbuf_getready(struct snd_dbuf *b)
  449 {
  450         SNDBUF_LOCKASSERT(b);
  451         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  452 
  453         return b->rl;
  454 }
  455 
  456 unsigned int
  457 sndbuf_getreadyptr(struct snd_dbuf *b)
  458 {
  459         SNDBUF_LOCKASSERT(b);
  460         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  461 
  462         return b->rp;
  463 }
  464 
  465 unsigned int
  466 sndbuf_getfree(struct snd_dbuf *b)
  467 {
  468         SNDBUF_LOCKASSERT(b);
  469         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  470 
  471         return b->bufsize - b->rl;
  472 }
  473 
  474 unsigned int
  475 sndbuf_getfreeptr(struct snd_dbuf *b)
  476 {
  477         SNDBUF_LOCKASSERT(b);
  478         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  479         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  480 
  481         return (b->rp + b->rl) % b->bufsize;
  482 }
  483 
  484 unsigned int
  485 sndbuf_getblocks(struct snd_dbuf *b)
  486 {
  487         SNDBUF_LOCKASSERT(b);
  488 
  489         return b->total / b->blksz;
  490 }
  491 
  492 unsigned int
  493 sndbuf_getprevblocks(struct snd_dbuf *b)
  494 {
  495         SNDBUF_LOCKASSERT(b);
  496 
  497         return b->prev_total / b->blksz;
  498 }
  499 
  500 unsigned int
  501 sndbuf_gettotal(struct snd_dbuf *b)
  502 {
  503         SNDBUF_LOCKASSERT(b);
  504 
  505         return b->total;
  506 }
  507 
  508 void
  509 sndbuf_updateprevtotal(struct snd_dbuf *b)
  510 {
  511         SNDBUF_LOCKASSERT(b);
  512 
  513         b->prev_total = b->total;
  514 }
  515 
  516 /************************************************************/
  517 
  518 int
  519 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
  520 {
  521         int l;
  522 
  523         KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > kfree %d", __func__, count, sndbuf_getfree(b)));
  524         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  525         b->total += count;
  526         if (from != NULL) {
  527                 while (count > 0) {
  528                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
  529                         bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
  530                         from += l;
  531                         b->rl += l;
  532                         count -= l;
  533                 }
  534         } else
  535                 b->rl += count;
  536         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  537 
  538         return 0;
  539 }
  540 
  541 int
  542 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
  543 {
  544         int l;
  545 
  546         KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
  547         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  548         if (to != NULL) {
  549                 while (count > 0) {
  550                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
  551                         bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
  552                         to += l;
  553                         b->rl -= l;
  554                         b->rp = (b->rp + l) % b->bufsize;
  555                         count -= l;
  556                 }
  557         } else {
  558                 b->rl -= count;
  559                 b->rp = (b->rp + count) % b->bufsize;
  560         }
  561         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  562 
  563         return 0;
  564 }
  565 
  566 /* count is number of bytes we want added to destination buffer */
  567 int
  568 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
  569 {
  570         KASSERT(count > 0, ("can't feed 0 bytes"));
  571 
  572         if (sndbuf_getfree(to) < count)
  573                 return EINVAL;
  574 
  575         count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
  576         if (count)
  577                 sndbuf_acquire(to, to->tmpbuf, count);
  578         /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
  579 
  580         return 0;
  581 }
  582 
  583 /************************************************************/
  584 
  585 void
  586 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
  587 {
  588         kprintf("%s: [", s);
  589         if (what & 0x01)
  590                 kprintf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
  591         if (what & 0x02)
  592                 kprintf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
  593         if (what & 0x04)
  594                 kprintf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
  595         if (what & 0x08)
  596                 kprintf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
  597         if (what & 0x10)
  598                 kprintf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
  599         kprintf(" ]\n");
  600 }
  601 
  602 /************************************************************/
  603 u_int32_t
  604 sndbuf_getflags(struct snd_dbuf *b)
  605 {
  606         return b->flags;
  607 }
  608 
  609 void
  610 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
  611 {
  612         b->flags &= ~flags;
  613         if (on)
  614                 b->flags |= flags;
  615 }

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