sys/dev/sound/pcm/channel.c

   1 /*-
   2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
   3  * Portions Copyright by Luigi Rizzo - 1997-99
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/sound/pcm/channel.c,v 1.99.2.5 2007/05/13 20:53:39 ariff Exp $
  28  * $DragonFly: src/sys/dev/sound/pcm/channel.c,v 1.14 2007/06/16 20:07:22 dillon Exp $
  29  */
  30
  31 #include "use_isa.h"
  32
  33 #include <dev/sound/pcm/sound.h>
  34 #include <sys/vnode.h>          /* IO_NDELAY */
  35
  36 #include "feeder_if.h"
  37
  38 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/channel.c,v 1.14 2007/06/16 20:07:22 dillon Exp $");
  39
  40 #define MIN_CHUNK_SIZE          256     /* for uiomove etc. */
  41 #if 0
  42 #define DMA_ALIGN_THRESHOLD     4
  43 #define DMA_ALIGN_MASK          (~(DMA_ALIGN_THRESHOLD - 1))
  44 #endif
  45
  46 #define CANCHANGE(c) (!(c->flags & CHN_F_TRIGGERED))
  47
  48 /*
  49 #define DEB(x) x
  50 */
  51
  52 static int chn_targetirqrate = 32;
  53 TUNABLE_INT("hw.snd.targetirqrate", &chn_targetirqrate);
  54
  55 static int
  56 sysctl_hw_snd_targetirqrate(SYSCTL_HANDLER_ARGS)
  57 {
  58         int err, val;
  59
  60         val = chn_targetirqrate;
  61         err = sysctl_handle_int(oidp, &val, sizeof(val), req);
  62         if (val < 16 || val > 512)
  63                 err = EINVAL;
  64         else
  65                 chn_targetirqrate = val;
  66
  67         return err;
  68 }
  69 SYSCTL_PROC(_hw_snd, OID_AUTO, targetirqrate, CTLTYPE_INT | CTLFLAG_RW,
  70         0, sizeof(int), sysctl_hw_snd_targetirqrate, "I", "");
  71 static int report_soft_formats = 1;
  72 SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_formats, CTLFLAG_RW,
  73         &report_soft_formats, 1, "report software-emulated formats");
  74
  75 static int chn_buildfeeder(struct pcm_channel *c);
  76
  77 static void
  78 chn_lockinit(struct pcm_channel *c, int dir)
  79 {
  80         switch(dir) {
  81         case PCMDIR_PLAY:
  82                 c->lock = snd_mtxcreate(c->name, "pcm play channel");
  83                 break;
  84         case PCMDIR_REC:
  85                 c->lock = snd_mtxcreate(c->name, "pcm record channel");
  86                 break;
  87         case PCMDIR_VIRTUAL:
  88                 c->lock = snd_mtxcreate(c->name, "pcm virtual play channel");
  89                 break;
  90         case 0:
  91                 c->lock = snd_mtxcreate(c->name, "pcm fake channel");
  92                 break;
  93         }
  94 }
  95
  96 static void
  97 chn_lockdestroy(struct pcm_channel *c)
  98 {
  99         snd_mtxfree(c->lock);
 100 }
 101
 102 static int
 103 chn_polltrigger(struct pcm_channel *c)
 104 {
 105         struct snd_dbuf *bs = c->bufsoft;
 106         unsigned amt, lim;
 107
 108         CHN_LOCKASSERT(c);
 109         if (c->flags & CHN_F_MAPPED) {
 110                 if (sndbuf_getprevblocks(bs) == 0)
 111                         return 1;
 112                 else
 113                         return (sndbuf_getblocks(bs) > sndbuf_getprevblocks(bs))? 1 : 0;
 114         } else {
 115                 amt = (c->direction == PCMDIR_PLAY)? sndbuf_getfree(bs) : sndbuf_getready(bs);
 116 #if 0
 117                 lim = (c->flags & CHN_F_HAS_SIZE)? sndbuf_getblksz(bs) : 1;
 118 #endif
 119                 lim = 1;
 120                 return (amt >= lim)? 1 : 0;
 121         }
 122         return 0;
 123 }
 124
 125 static int
 126 chn_pollreset(struct pcm_channel *c)
 127 {
 128         struct snd_dbuf *bs = c->bufsoft;
 129
 130         CHN_LOCKASSERT(c);
 131         sndbuf_updateprevtotal(bs);
 132         return 1;
 133 }
 134
 135 static void
 136 chn_wakeup(struct pcm_channel *c)
 137 {
 138         struct snd_dbuf *bs = c->bufsoft;
 139         struct pcmchan_children *pce;
 140
 141         CHN_LOCKASSERT(c);
 142         if (SLIST_EMPTY(&c->children)) {
 143                 /*if (SEL_WAITING(sndbuf_getsel(bs)) && chn_polltrigger(c))*/
 144                 if (sndbuf_getsel(bs)->si_pid && chn_polltrigger(c))
 145                         selwakeup(sndbuf_getsel(bs));
 146         } else {
 147                 SLIST_FOREACH(pce, &c->children, link) {
 148                         CHN_LOCK(pce->channel);
 149                         chn_wakeup(pce->channel);
 150                         CHN_UNLOCK(pce->channel);
 151                 }
 152         }
 153
 154         wakeup(bs);
 155 }
 156
 157 static int
 158 chn_sleep(struct pcm_channel *c, char *str, int timeout)
 159 {
 160         struct snd_dbuf *bs = c->bufsoft;
 161         int ret;
 162
 163         CHN_LOCKASSERT(c);
 164 #ifdef USING_MUTEX
 165         ret = snd_mtxsleep(bs, c->lock, PCATCH, str, timeout);
 166 #else
 167         ret = tsleep(bs, PRIBIO | PCATCH, str, timeout);
 168 #endif
 169
 170         return ret;
 171 }
 172
 173 /*
 174  * chn_dmaupdate() tracks the status of a dma transfer,
 175  * updating pointers.
 176  */
 177
 178 static unsigned int
 179 chn_dmaupdate(struct pcm_channel *c)
 180 {
 181         struct snd_dbuf *b = c->bufhard;
 182         unsigned int delta, old, hwptr, amt;
 183
 184         KASSERT(sndbuf_getsize(b) > 0, ("bufsize == 0"));
 185         CHN_LOCKASSERT(c);
 186
 187         old = sndbuf_gethwptr(b);
 188         hwptr = chn_getptr(c);
 189         delta = (sndbuf_getsize(b) + hwptr - old) % sndbuf_getsize(b);
 190         sndbuf_sethwptr(b, hwptr);
 191
 192         DEB(
 193         if (delta >= ((sndbuf_getsize(b) * 15) / 16)) {
 194                 if (!(c->flags & (CHN_F_CLOSING | CHN_F_ABORTING)))
 195                         device_printf(c->dev, "hwptr went backwards %d -> %d\n", old, hwptr);
 196         }
 197         );
 198
 199         if (c->direction == PCMDIR_PLAY) {
 200                 amt = MIN(delta, sndbuf_getready(b));
 201                 if (amt > 0)
 202                         sndbuf_dispose(b, NULL, amt);
 203         } else {
 204                 amt = MIN(delta, sndbuf_getfree(b));
 205                 if (amt > 0)
 206                        sndbuf_acquire(b, NULL, amt);
 207         }
 208
 209         return delta;
 210 }
 211
 212 void
 213 chn_wrupdate(struct pcm_channel *c)
 214 {
 215         int ret;
 216
 217         CHN_LOCKASSERT(c);
 218         KASSERT(c->direction == PCMDIR_PLAY, ("chn_wrupdate on bad channel"));
 219
 220         if ((c->flags & (CHN_F_MAPPED | CHN_F_VIRTUAL)) || !(c->flags & CHN_F_TRIGGERED))
 221                 return;
 222         chn_dmaupdate(c);
 223         ret = chn_wrfeed(c);
 224         /* tell the driver we've updated the primary buffer */
 225         chn_trigger(c, PCMTRIG_EMLDMAWR);
 226         DEB(if (ret)
 227                 kprintf("chn_wrupdate: chn_wrfeed returned %d\n", ret);)
 228
 229 }
 230
 231 int
 232 chn_wrfeed(struct pcm_channel *c)
 233 {
 234         struct snd_dbuf *b = c->bufhard;
 235         struct snd_dbuf *bs = c->bufsoft;
 236         unsigned int ret, amt;
 237
 238         CHN_LOCKASSERT(c);
 239 #if 0
 240         DEB(
 241         if (c->flags & CHN_F_CLOSING) {
 242                 sndbuf_dump(b, "b", 0x02);
 243                 sndbuf_dump(bs, "bs", 0x02);
 244         })
 245 #endif
 246
 247         if (c->flags & CHN_F_MAPPED)
 248                 sndbuf_acquire(bs, NULL, sndbuf_getfree(bs));
 249
 250         amt = sndbuf_getfree(b);
 251         KASSERT(amt <= sndbuf_getsize(bs),
 252             ("%s(%s): amt %d > source size %d, flags 0x%x", __func__, c->name,
 253            amt, sndbuf_getsize(bs), c->flags));
 254
 255         ret = (amt > 0) ? sndbuf_feed(bs, b, c, c->feeder, amt) : ENOSPC;
 256         /*
 257          * Possible xruns. There should be no empty space left in buffer.
 258          */
 259         if (sndbuf_getfree(b) > 0)
 260                 c->xruns++;
 261
 262         if (ret == 0 && sndbuf_getfree(b) < amt)
 263                 chn_wakeup(c);
 264
 265         return ret;
 266 }
 267
 268 static void
 269 chn_wrintr(struct pcm_channel *c)
 270 {
 271         int ret;
 272
 273         CHN_LOCKASSERT(c);
 274         /* update pointers in primary buffer */
 275         chn_dmaupdate(c);
 276         /* ...and feed from secondary to primary */
 277         ret = chn_wrfeed(c);
 278         /* tell the driver we've updated the primary buffer */
 279         chn_trigger(c, PCMTRIG_EMLDMAWR);
 280         DEB(if (ret)
 281                 kprintf("chn_wrintr: chn_wrfeed returned %d\n", ret);)
 282 }
 283
 284 /*
 285  * user write routine - uiomove data into secondary buffer, trigger if necessary
 286  * if blocking, sleep, rinse and repeat.
 287  *
 288  * called externally, so must handle locking
 289  */
 290
 291 int
 292 chn_write(struct pcm_channel *c, struct uio *buf, int ioflags)
 293 {
 294         int ret, timeout, newsize, count, sz;
 295         int nbio;
 296         struct snd_dbuf *bs = c->bufsoft;
 297         void *off;
 298         int t, x,togo,p;
 299
 300         CHN_LOCKASSERT(c);
 301         /*
 302          * XXX Certain applications attempt to write larger size
 303          * of pcm data than c->blocksize2nd without blocking,
 304          * resulting partial write. Expand the block size so that
 305          * the write operation avoids blocking.
 306          */
 307         nbio = (c->flags & CHN_F_NBIO) || (ioflags & IO_NDELAY);
 308         if (nbio && buf->uio_resid > sndbuf_getblksz(bs)) {
 309                 DEB(device_printf(c->dev, "broken app, nbio and tried to write %d bytes with fragsz %d\n",
 310                         buf->uio_resid, sndbuf_getblksz(bs)));
 311                 newsize = 16;
 312                 while (newsize < min(buf->uio_resid, CHN_2NDBUFMAXSIZE / 2))
 313                         newsize <<= 1;
 314                 chn_setblocksize(c, sndbuf_getblkcnt(bs), newsize);
 315                 DEB(device_printf(c->dev, "frags reset to %d x %d\n", sndbuf_getblkcnt(bs), sndbuf_getblksz(bs)));
 316         }
 317
 318         ret = 0;
 319         count = hz;
 320         while (!ret && (buf->uio_resid > 0) && (count > 0)) {
 321                 sz = sndbuf_getfree(bs);
 322                 if (sz == 0) {
 323                         if (nbio)
 324                                 ret = EWOULDBLOCK;
 325                         else {
 326                                 timeout = (hz * sndbuf_getblksz(bs)) / (sndbuf_getspd(bs) * sndbuf_getbps(bs));
 327                                 if (timeout < 1)
 328                                         timeout = 1;
 329                                 timeout = 1;
 330                                 ret = chn_sleep(c, "pcmwr", timeout);
 331                                 if (ret == EWOULDBLOCK) {
 332                                         count -= timeout;
 333                                         ret = 0;
 334                                 } else if (ret == 0)
 335                                         count = hz;
 336                         }
 337                 } else {
 338                         sz = MIN(sz, buf->uio_resid);
 339                         KASSERT(sz > 0, ("confusion in chn_write"));
 340                         /* kprintf("sz: %d\n", sz); */
 341
 342                         /*
 343                          * The following assumes that the free space in
 344                          * the buffer can never be less around the
 345                          * unlock-uiomove-lock sequence.
 346                          */
 347                         togo = sz;
 348                         while (ret == 0 && togo> 0) {
 349                                 p = sndbuf_getfreeptr(bs);
 350                                 t = MIN(togo, sndbuf_getsize(bs) - p);
 351                                 off = sndbuf_getbufofs(bs, p);
 352                                 CHN_UNLOCK(c);
 353                                 ret = uiomove(off, t, buf);
 354                                 CHN_LOCK(c);
 355                                 togo -= t;
 356                                 x = sndbuf_acquire(bs, NULL, t);
 357                         }
 358                         ret = 0;
 359                         if (ret == 0 && !(c->flags & CHN_F_TRIGGERED))
 360                                 chn_start(c, 0);
 361                 }
 362         }
 363         /* kprintf("ret: %d left: %d\n", ret, buf->uio_resid); */
 364
 365         if (count <= 0) {
 366                 c->flags |= CHN_F_DEAD;
 367                 kprintf("%s: play interrupt timeout, channel dead\n", c->name);
 368         }
 369
 370         return ret;
 371 }
 372
 373 #if 0
 374 static int
 375 chn_rddump(struct pcm_channel *c, unsigned int cnt)
 376 {
 377         struct snd_dbuf *b = c->bufhard;
 378
 379         CHN_LOCKASSERT(c);
 380 #if 0
 381         static uint32_t kk = 0;
 382         printf("%u: dumping %d bytes\n", ++kk, cnt);
 383 #endif
 384         c->xruns++;
 385         sndbuf_setxrun(b, sndbuf_getxrun(b) + cnt);
 386         return sndbuf_dispose(b, NULL, cnt);
 387 }
 388 #endif
 389
 390 /*
 391  * Feed new data from the read buffer. Can be called in the bottom half.
 392  */
 393 int
 394 chn_rdfeed(struct pcm_channel *c)
 395 {
 396         struct snd_dbuf *b = c->bufhard;
 397         struct snd_dbuf *bs = c->bufsoft;
 398         unsigned int ret, amt;
 399
 400         CHN_LOCKASSERT(c);
 401         DEB(
 402         if (c->flags & CHN_F_CLOSING) {
 403                 sndbuf_dump(b, "b", 0x02);
 404                 sndbuf_dump(bs, "bs", 0x02);
 405         })
 406
 407 #if 0
 408         amt = sndbuf_getready(b);
 409         if (sndbuf_getfree(bs) < amt) {
 410                 c->xruns++;
 411                 amt = sndbuf_getfree(bs);
 412         }
 413 #endif
 414         amt = sndbuf_getfree(bs);
 415         ret = (amt > 0)? sndbuf_feed(b, bs, c, c->feeder, amt) : 0;
 416
 417         amt = sndbuf_getready(b);
 418         if (amt > 0) {
 419                 c->xruns++;
 420                 sndbuf_dispose(b, NULL, amt);
 421         }
 422
 423         chn_wakeup(c);
 424
 425         return ret;
 426 }
 427
 428 void
 429 chn_rdupdate(struct pcm_channel *c)
 430 {
 431         int ret;
 432
 433         CHN_LOCKASSERT(c);
 434         KASSERT(c->direction == PCMDIR_REC, ("chn_rdupdate on bad channel"));
 435
 436         if ((c->flags & CHN_F_MAPPED) || !(c->flags & CHN_F_TRIGGERED))
 437                 return;
 438         chn_trigger(c, PCMTRIG_EMLDMARD);
 439         chn_dmaupdate(c);
 440         ret = chn_rdfeed(c);
 441         DEB(if (ret)
 442                 kprintf("chn_rdfeed: %d\n", ret);)
 443 }
 444
 445 /* read interrupt routine. Must be called with interrupts blocked. */
 446 static void
 447 chn_rdintr(struct pcm_channel *c)
 448 {
 449         int ret;
 450
 451         CHN_LOCKASSERT(c);
 452         /* tell the driver to update the primary buffer if non-dma */
 453         chn_trigger(c, PCMTRIG_EMLDMARD);
 454         /* update pointers in primary buffer */
 455         chn_dmaupdate(c);
 456         /* ...and feed from primary to secondary */
 457         ret = chn_rdfeed(c);
 458 }
 459
 460 /*
 461  * user read routine - trigger if necessary, uiomove data from secondary buffer
 462  * if blocking, sleep, rinse and repeat.
 463  *
 464  * called externally, so must handle locking
 465  */
 466
 467 int
 468 chn_read(struct pcm_channel *c, struct uio *buf, int ioflags)
 469 {
 470         int             ret, timeout, sz, count;
 471         int nbio;
 472         struct snd_dbuf       *bs = c->bufsoft;
 473         void *off;
 474         int t, x,togo,p;
 475
 476         CHN_LOCKASSERT(c);
 477         nbio = (c->flags & CHN_F_NBIO) || (ioflags & IO_NDELAY);
 478         if (!(c->flags & CHN_F_TRIGGERED))
 479                 chn_start(c, 0);
 480
 481         ret = 0;
 482         count = hz;
 483         while (!ret && (buf->uio_resid > 0) && (count > 0)) {
 484                 sz = MIN(buf->uio_resid, sndbuf_getready(bs));
 485
 486                 if (sz > 0) {
 487                         /*
 488                          * The following assumes that the free space in
 489                          * the buffer can never be less around the
 490                          * unlock-uiomove-lock sequence.
 491                          */
 492                         togo = sz;
 493                         while (ret == 0 && togo> 0) {
 494                                 p = sndbuf_getreadyptr(bs);
 495                                 t = MIN(togo, sndbuf_getsize(bs) - p);
 496                                 off = sndbuf_getbufofs(bs, p);
 497                                 CHN_UNLOCK(c);
 498                                 ret = uiomove(off, t, buf);
 499                                 CHN_LOCK(c);
 500                                 togo -= t;
 501                                 x = sndbuf_dispose(bs, NULL, t);
 502                         }
 503                         ret = 0;
 504                 } else {
 505                         if (nbio) {
 506                                 ret = EWOULDBLOCK;
 507                         } else {
 508                                 timeout = (hz * sndbuf_getblksz(bs)) / (sndbuf_getspd(bs) * sndbuf_getbps(bs));
 509                                 if (timeout < 1)
 510                                         timeout = 1;
 511                                 ret = chn_sleep(c, "pcmrd", timeout);
 512                                 if (ret == EWOULDBLOCK) {
 513                                         count -= timeout;
 514                                         ret = 0;
 515                                 } else {
 516                                         count = hz;
 517                                 }
 518
 519                         }
 520                 }
 521         }
 522
 523         if (count <= 0) {
 524                 c->flags |= CHN_F_DEAD;
 525                 kprintf("%s: record interrupt timeout, channel dead\n", c->name);
 526         }
 527
 528         return ret;
 529 }
 530
 531 void
 532 chn_intr(struct pcm_channel *c)
 533 {
 534         CHN_LOCK(c);
 535         c->interrupts++;
 536         if (c->direction == PCMDIR_PLAY)
 537                 chn_wrintr(c);
 538         else
 539                 chn_rdintr(c);
 540         CHN_UNLOCK(c);
 541 }
 542
 543 u_int32_t
 544 chn_start(struct pcm_channel *c, int force)
 545 {
 546         u_int32_t i, j;
 547         struct snd_dbuf *b = c->bufhard;
 548         struct snd_dbuf *bs = c->bufsoft;
 549
 550         CHN_LOCKASSERT(c);
 551         /* if we're running, or if we're prevented from triggering, bail */
 552         if ((c->flags & CHN_F_TRIGGERED) || ((c->flags & CHN_F_NOTRIGGER) && !force))
 553                 return EINVAL;
 554
 555         i = (c->direction == PCMDIR_PLAY)? sndbuf_getready(bs) : sndbuf_getfree(bs);
 556         j = (c->direction == PCMDIR_PLAY)? sndbuf_getfree(b) : sndbuf_getready(b);
 557         if (force || (i >= j)) {
 558                 c->flags |= CHN_F_TRIGGERED;
 559                 /*
 560                  * if we're starting because a vchan started, don't feed any data
 561                  * or it becomes impossible to start vchans synchronised with the
 562                  * first one.  the hardbuf should be empty so we top it up with
 563                  * silence to give it something to chew.  the real data will be
 564                  * fed at the first irq.
 565                  */
 566                 if (c->direction == PCMDIR_PLAY) {
 567                         /*
 568                          * Reduce pops during playback startup.
 569                          */
 570                         sndbuf_fillsilence(b);
 571                         if (SLIST_EMPTY(&c->children))
 572                                 chn_wrfeed(c);
 573                 }
 574                 sndbuf_setrun(b, 1);
 575                 c->xruns = 0;
 576                 chn_trigger(c, PCMTRIG_START);
 577                 return 0;
 578         }
 579
 580         return 0;
 581 }
 582
 583 void
 584 chn_resetbuf(struct pcm_channel *c)
 585 {
 586         struct snd_dbuf *b = c->bufhard;
 587         struct snd_dbuf *bs = c->bufsoft;
 588
 589         c->blocks = 0;
 590         sndbuf_reset(b);
 591         sndbuf_reset(bs);
 592 }
 593
 594 /*
 595  * chn_sync waits until the space in the given channel goes above
 596  * a threshold. The threshold is checked against fl or rl respectively.
 597  * Assume that the condition can become true, do not check here...
 598  */
 599 int
 600 chn_sync(struct pcm_channel *c, int threshold)
 601 {
 602         u_long rdy;
 603         int ret;
 604         struct snd_dbuf *bs = c->bufsoft;
 605
 606         CHN_LOCKASSERT(c);
 607
 608         /* if we haven't yet started and nothing is buffered, else start*/
 609         if (!(c->flags & CHN_F_TRIGGERED)) {
 610                 if (sndbuf_getready(bs) > 0) {
 611                         ret = chn_start(c, 1);
 612                         if (ret)
 613                                 return ret;
 614                 } else {
 615                         return 0;
 616                 }
 617         }
 618
 619         for (;;) {
 620                 rdy = (c->direction == PCMDIR_PLAY)? sndbuf_getfree(bs) : sndbuf_getready(bs);
 621                 if (rdy <= threshold) {
 622                         ret = chn_sleep(c, "pcmsyn", 1);
 623                         if (ret == ERESTART || ret == EINTR) {
 624                                 DEB(kprintf("chn_sync: tsleep returns %d\n", ret));
 625                                 return -1;
 626                         }
 627                 } else
 628                         break;
 629         }
 630         return 0;
 631 }
 632
 633 /* called externally, handle locking */
 634 int
 635 chn_poll(struct pcm_channel *c, int ev, struct thread *td)
 636 {
 637         struct snd_dbuf *bs = c->bufsoft;
 638         int ret;
 639
 640         CHN_LOCKASSERT(c);
 641         if (!(c->flags & CHN_F_MAPPED) && !(c->flags & CHN_F_TRIGGERED))
 642                 chn_start(c, 1);
 643         ret = 0;
 644         if (chn_polltrigger(c) && chn_pollreset(c))
 645                 ret = ev;
 646         else
 647                 selrecord(td, sndbuf_getsel(bs));
 648         return ret;
 649 }
 650
 651 /*
 652  * chn_abort terminates a running dma transfer.  it may sleep up to 200ms.
 653  * it returns the number of bytes that have not been transferred.
 654  *
 655  * called from: dsp_close, dsp_ioctl, with channel locked
 656  */
 657 int
 658 chn_abort(struct pcm_channel *c)
 659 {
 660         int missing = 0;
 661         struct snd_dbuf *b = c->bufhard;
 662         struct snd_dbuf *bs = c->bufsoft;
 663
 664         CHN_LOCKASSERT(c);
 665         if (!(c->flags & CHN_F_TRIGGERED))
 666                 return 0;
 667         c->flags |= CHN_F_ABORTING;
 668
 669         c->flags &= ~CHN_F_TRIGGERED;
 670         /* kill the channel */
 671         chn_trigger(c, PCMTRIG_ABORT);
 672         sndbuf_setrun(b, 0);
 673         if (!(c->flags & CHN_F_VIRTUAL))
 674                 chn_dmaupdate(c);
 675         missing = sndbuf_getready(bs) + sndbuf_getready(b);
 676
 677         c->flags &= ~CHN_F_ABORTING;
 678         return missing;
 679 }
 680
 681 /*
 682  * this routine tries to flush the dma transfer. It is called
 683  * on a close of a playback channel.
 684  * first, if there is data in the buffer, but the dma has not yet
 685  * begun, we need to start it.
 686  * next, we wait for the play buffer to drain
 687  * finally, we stop the dma.
 688  *
 689  * called from: dsp_close, not valid for record channels.
 690  */
 691
 692 int
 693 chn_flush(struct pcm_channel *c)
 694 {
 695         int ret, count, resid, resid_p;
 696         struct snd_dbuf *b = c->bufhard;
 697         struct snd_dbuf *bs = c->bufsoft;
 698
 699         CHN_LOCKASSERT(c);
 700         KASSERT(c->direction == PCMDIR_PLAY, ("chn_flush on bad channel"));
 701         DEB(kprintf("chn_flush: c->flags 0x%08x\n", c->flags));
 702
 703         /* if we haven't yet started and nothing is buffered, else start*/
 704         if (!(c->flags & CHN_F_TRIGGERED)) {
 705                 if (sndbuf_getready(bs) > 0) {
 706                         ret = chn_start(c, 1);
 707                         if (ret)
 708                                 return ret;
 709                 } else {
 710                         return 0;
 711                 }
 712         }
 713
 714         c->flags |= CHN_F_CLOSING;
 715         resid = sndbuf_getready(bs) + sndbuf_getready(b);
 716         resid_p = resid;
 717         count = 10;
 718         ret = 0;
 719         while ((count > 0) && (resid > sndbuf_getsize(b)) && (ret == 0)) {
 720                 /* still pending output data. */
 721                 ret = chn_sleep(c, "pcmflu", hz / 10);
 722                 if (ret == EWOULDBLOCK)
 723                         ret = 0;
 724                 if (ret == 0) {
 725                         resid = sndbuf_getready(bs) + sndbuf_getready(b);
 726                         if (resid == resid_p)
 727                                 count--;
 728                         if (resid > resid_p)
 729                                 DEB(printf("chn_flush: buffer length increasind %d -> %d\n", resid_p, resid));
 730                         resid_p = resid;
 731                 }
 732         }
 733         if (count == 0)
 734                 DEB(kprintf("chn_flush: timeout, hw %d, sw %d\n",
 735                         sndbuf_getready(b), sndbuf_getready(bs)));
 736
 737         c->flags &= ~CHN_F_TRIGGERED;
 738         /* kill the channel */
 739         chn_trigger(c, PCMTRIG_ABORT);
 740         sndbuf_setrun(b, 0);
 741
 742         c->flags &= ~CHN_F_CLOSING;
 743         return 0;
 744 }
 745
 746 int
 747 fmtvalid(u_int32_t fmt, u_int32_t *fmtlist)
 748 {
 749         int i;
 750
 751         for (i = 0; fmtlist[i]; i++)
 752                 if (fmt == fmtlist[i])
 753                         return 1;
 754         return 0;
 755 }
 756
 757 int
 758 chn_reset(struct pcm_channel *c, u_int32_t fmt)
 759 {
 760         int hwspd, r;
 761
 762         CHN_LOCKASSERT(c);
 763         c->flags &= CHN_F_RESET;
 764         c->interrupts = 0;
 765         c->xruns = 0;
 766
 767         r = CHANNEL_RESET(c->methods, c->devinfo);
 768         if (fmt != 0) {
 769 #if 0
 770                 hwspd = DSP_DEFAULT_SPEED;
 771                 /* only do this on a record channel until feederbuilder works */
 772                 if (c->direction == PCMDIR_REC)
 773                         RANGE(hwspd, chn_getcaps(c)->minspeed, chn_getcaps(c)->maxspeed);
 774                 c->speed = hwspd;
 775 #endif
 776                 hwspd = chn_getcaps(c)->minspeed;
 777                 c->speed = hwspd;
 778
 779                 if (r == 0)
 780                         r = chn_setformat(c, fmt);
 781                 if (r == 0)
 782                         r = chn_setspeed(c, hwspd);
 783 #if 0
 784                 if (r == 0)
 785                         r = chn_setvolume(c, 100, 100);
 786 #endif
 787         }
 788         if (r == 0)
 789                 r = chn_setblocksize(c, 0, 0);
 790         if (r == 0) {
 791                 chn_resetbuf(c);
 792                 r = CHANNEL_RESETDONE(c->methods, c->devinfo);
 793         }
 794         return r;
 795 }
 796
 797 int
 798 chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction)
 799 {
 800         struct feeder_class *fc;
 801         struct snd_dbuf *b, *bs;
 802         int ret;
 803
 804         chn_lockinit(c, dir);
 805
 806         b = NULL;
 807         bs = NULL;
 808         c->devinfo = NULL;
 809         c->feeder = NULL;
 810
 811         ret = ENOMEM;
 812         b = sndbuf_create(c->dev, c->name, "primary", c);
 813         if (b == NULL)
 814                 goto out;
 815         bs = sndbuf_create(c->dev, c->name, "secondary", c);
 816         if (bs == NULL)
 817                 goto out;
 818
 819         CHN_LOCK(c);
 820
 821         ret = EINVAL;
 822         fc = feeder_getclass(NULL);
 823         if (fc == NULL)
 824                 goto out;
 825         if (chn_addfeeder(c, fc, NULL))
 826                 goto out;
 827
 828         /*
 829          * XXX - sndbuf_setup() & sndbuf_resize() expect to be called
 830          *       with the channel unlocked because they are also called
 831          *       from driver methods that don't know about locking
 832          */
 833         CHN_UNLOCK(c);
 834         sndbuf_setup(bs, NULL, 0);
 835         CHN_LOCK(c);
 836         c->bufhard = b;
 837         c->bufsoft = bs;
 838         c->flags = 0;
 839         c->feederflags = 0;
 840
 841         ret = ENODEV;
 842         CHN_UNLOCK(c); /* XXX - Unlock for CHANNEL_INIT() kmalloc() call */
 843         c->devinfo = CHANNEL_INIT(c->methods, devinfo, b, c, direction);
 844         CHN_LOCK(c);
 845         if (c->devinfo == NULL)
 846                 goto out;
 847
 848         ret = ENOMEM;
 849         if ((sndbuf_getsize(b) == 0) && ((c->flags & CHN_F_VIRTUAL) == 0))
 850                 goto out;
 851
 852         ret = chn_setdir(c, direction);
 853         if (ret)
 854                 goto out;
 855
 856         ret = sndbuf_setfmt(b, AFMT_U8);
 857         if (ret)
 858                 goto out;
 859
 860         ret = sndbuf_setfmt(bs, AFMT_U8);
 861         if (ret)
 862                 goto out;
 863
 864         ret = chn_setvolume(c, 100, 100);
 865         if (ret)
 866                 goto out;
 867
 868
 869 out:
 870         CHN_UNLOCK(c);
 871         if (ret) {
 872                 if (c->devinfo) {
 873                         if (CHANNEL_FREE(c->methods, c->devinfo))
 874                                 sndbuf_free(b);
 875                 }
 876                 if (bs)
 877                         sndbuf_destroy(bs);
 878                 if (b)
 879                         sndbuf_destroy(b);
 880                 c->flags |= CHN_F_DEAD;
 881                 chn_lockdestroy(c);
 882
 883                 return ret;
 884         }
 885
 886         return 0;
 887 }
 888
 889 int
 890 chn_kill(struct pcm_channel *c)
 891 {
 892         struct snd_dbuf *b = c->bufhard;
 893         struct snd_dbuf *bs = c->bufsoft;
 894
 895         if (c->flags & CHN_F_TRIGGERED)
 896                 chn_trigger(c, PCMTRIG_ABORT);
 897         while (chn_removefeeder(c) == 0);
 898         if (CHANNEL_FREE(c->methods, c->devinfo))
 899                 sndbuf_free(b);
 900         c->flags |= CHN_F_DEAD;
 901         sndbuf_destroy(bs);
 902         sndbuf_destroy(b);
 903         chn_lockdestroy(c);
 904         return 0;
 905 }
 906
 907 int
 908 chn_setdir(struct pcm_channel *c, int dir)
 909 {
 910 #if NISA > 0
 911         struct snd_dbuf *b = c->bufhard;
 912 #endif
 913         int r;
 914
 915         CHN_LOCKASSERT(c);
 916         c->direction = dir;
 917         r = CHANNEL_SETDIR(c->methods, c->devinfo, c->direction);
 918 #if NISA > 0
 919         if (!r && SND_DMA(b))
 920                 sndbuf_dmasetdir(b, c->direction);
 921 #endif
 922         return r;
 923 }
 924
 925 int
 926 chn_setvolume(struct pcm_channel *c, int left, int right)
 927 {
 928         CHN_LOCKASSERT(c);
 929         /* should add a feeder for volume changing if channel returns -1 */
 930         if (left > 100)
 931                 left = 100;
 932         if (left < 0)
 933                 left = 0;
 934         if (right > 100)
 935                 right = 100;
 936         if (right < 0)
 937                 right = 0;
 938         c->volume = left | (right << 8);
 939         return 0;
 940 }
 941
 942 static int
 943 chn_tryspeed(struct pcm_channel *c, int speed)
 944 {
 945         struct pcm_feeder *f;
 946         struct snd_dbuf *b = c->bufhard;
 947         struct snd_dbuf *bs = c->bufsoft;
 948         struct snd_dbuf *x;
 949         int r, delta;
 950
 951         CHN_LOCKASSERT(c);
 952         DEB(kprintf("setspeed, channel %s\n", c->name));
 953         DEB(kprintf("want speed %d, ", speed));
 954         if (speed <= 0)
 955                 return EINVAL;
 956         if (CANCHANGE(c)) {
 957                 r = 0;
 958                 c->speed = speed;
 959                 sndbuf_setspd(bs, speed);
 960                 RANGE(speed, chn_getcaps(c)->minspeed, chn_getcaps(c)->maxspeed);
 961                 DEB(kprintf("try speed %d, ", speed));
 962                 sndbuf_setspd(b, CHANNEL_SETSPEED(c->methods, c->devinfo, speed));
 963                 DEB(kprintf("got speed %d\n", sndbuf_getspd(b)));
 964
 965                 delta = sndbuf_getspd(b) - sndbuf_getspd(bs);
 966                 if (delta < 0)
 967                         delta = -delta;
 968
 969                 c->feederflags &= ~(1 << FEEDER_RATE);
 970                 /*
 971                  * Used to be 500. It was too big!
 972                  */
 973                 if (delta > 25)
 974                         c->feederflags |= 1 << FEEDER_RATE;
 975                 else
 976                         sndbuf_setspd(bs, sndbuf_getspd(b));
 977
 978                 r = chn_buildfeeder(c);
 979                 DEB(kprintf("r = %d\n", r));
 980                 if (r)
 981                         goto out;
 982
 983                 r = chn_setblocksize(c, 0, 0);
 984                 if (r)
 985                         goto out;
 986
 987                 if (!(c->feederflags & (1 << FEEDER_RATE)))
 988                         goto out;
 989
 990                 r = EINVAL;
 991                 f = chn_findfeeder(c, FEEDER_RATE);
 992                 DEB(kprintf("feedrate = %p\n", f));
 993                 if (f == NULL)
 994                         goto out;
 995
 996                 x = (c->direction == PCMDIR_REC)? b : bs;
 997                 r = FEEDER_SET(f, FEEDRATE_SRC, sndbuf_getspd(x));
 998                 DEB(kprintf("feeder_set(FEEDRATE_SRC, %d) = %d\n", sndbuf_getspd(x), r));
 999                 if (r)
1000                         goto out;
1001
1002                 x = (c->direction == PCMDIR_REC)? bs : b;
1003                 r = FEEDER_SET(f, FEEDRATE_DST, sndbuf_getspd(x));
1004                 DEB(kprintf("feeder_set(FEEDRATE_DST, %d) = %d\n", sndbuf_getspd(x), r));
1005 out:
1006                 if (!r)
1007                         r = CHANNEL_SETFORMAT(c->methods, c->devinfo,
1008                                                         sndbuf_getfmt(b));
1009                 if (!r)
1010                         sndbuf_setfmt(bs, c->format);
1011                 DEB(kprintf("setspeed done, r = %d\n", r));
1012                 return r;
1013         } else
1014                 return EINVAL;
1015 }
1016
1017 int
1018 chn_setspeed(struct pcm_channel *c, int speed)
1019 {
1020         int r, oldspeed = c->speed;
1021
1022         r = chn_tryspeed(c, speed);
1023         if (r) {
1024                 DEB(kprintf("Failed to set speed %d falling back to %d\n", speed, oldspeed));
1025                 r = chn_tryspeed(c, oldspeed);
1026         }
1027         return r;
1028 }
1029
1030 static int
1031 chn_tryformat(struct pcm_channel *c, u_int32_t fmt)
1032 {
1033         struct snd_dbuf *b = c->bufhard;
1034         struct snd_dbuf *bs = c->bufsoft;
1035         int r;
1036
1037         CHN_LOCKASSERT(c);
1038         if (CANCHANGE(c)) {
1039                 DEB(kprintf("want format %d\n", fmt));
1040                 c->format = fmt;
1041                 r = chn_buildfeeder(c);
1042                 if (r == 0) {
1043                         sndbuf_setfmt(bs, c->format);
1044                         chn_resetbuf(c);
1045                         r = CHANNEL_SETFORMAT(c->methods, c->devinfo, sndbuf_getfmt(b));
1046                         if (r == 0)
1047                                 r = chn_tryspeed(c, c->speed);
1048                 }
1049                 return r;
1050         } else
1051                 return EINVAL;
1052 }
1053
1054 int
1055 chn_setformat(struct pcm_channel *c, u_int32_t fmt)
1056 {
1057         u_int32_t oldfmt = c->format;
1058         int r;
1059
1060         r = chn_tryformat(c, fmt);
1061         if (r) {
1062                 DEB(kprintf("Format change %d failed, reverting to %d\n", fmt, oldfmt));
1063                 chn_tryformat(c, oldfmt);
1064         }
1065         return r;
1066 }
1067
1068 /*
1069  * given a bufsz value, round it to a power of 2 in the min-max range
1070  * XXX only works if min and max are powers of 2
1071  */
1072 static int
1073 round_bufsz(int bufsz, int min, int max)
1074 {
1075         int tmp = min * 2;
1076
1077         KASSERT((min & (min-1)) == 0, ("min %d must be power of 2\n", min));
1078         KASSERT((max & (max-1)) == 0, ("max %d must be power of 2\n", max));
1079         while (tmp <= bufsz)
1080                 tmp <<= 1;
1081         tmp >>= 1;
1082         if (tmp > max)
1083                 tmp = max;
1084         return tmp;
1085 }
1086
1087 /*
1088  * set the channel's blocksize both for soft and hard buffers.
1089  *
1090  * blksz should be a power of 2 between 2**4 and 2**16 -- it is useful
1091  * that it has the same value for both bufsoft and bufhard.
1092  * blksz == -1 computes values according to a target irq rate.
1093  * blksz == 0 reuses previous values if available, otherwise
1094  * behaves as for -1
1095  *
1096  * blkcnt is set by the user, between 2 and (2**17)/blksz for bufsoft,
1097  * but should be a power of 2 for bufhard to simplify life to low
1098  * level drivers.
1099  * Note, for the rec channel a large blkcnt is ok,
1100  * but for the play channel we want blksz as small as possible to keep
1101  * the delay small, because routines in the write path always try to
1102  * keep bufhard full.
1103  *
1104  * Unless we have good reason to, use the values suggested by the caller.
1105  */
1106 int
1107 chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz)
1108 {
1109         struct snd_dbuf *b = c->bufhard;
1110         struct snd_dbuf *bs = c->bufsoft;
1111         int irqhz, ret, maxsz, maxsize, reqblksz;
1112
1113         CHN_LOCKASSERT(c);
1114         if (!CANCHANGE(c) || (c->flags & CHN_F_MAPPED)) {
1115                 KASSERT(sndbuf_getsize(bs) ==  0 ||
1116                     sndbuf_getsize(bs) >= sndbuf_getsize(b),
1117                     ("%s(%s): bufsoft size %d < bufhard size %d", __func__,
1118                     c->name, sndbuf_getsize(bs), sndbuf_getsize(b)));
1119                 return EINVAL;
1120         }
1121         c->flags |= CHN_F_SETBLOCKSIZE;
1122
1123         ret = 0;
1124         DEB(kprintf("%s(%d, %d)\n", __func__, blkcnt, blksz));
1125         if (blksz == 0 || blksz == -1) { /* let the driver choose values */
1126                 if (blksz == -1)        /* delete previous values */
1127                         c->flags &= ~CHN_F_HAS_SIZE;
1128                 if (!(c->flags & CHN_F_HAS_SIZE)) { /* no previous value */
1129                         /*
1130                          * compute a base blksz according to the target irq
1131                          * rate, then round to a suitable power of 2
1132                          * in the range 16.. 2^17/2.
1133                          * Finally compute a suitable blkcnt.
1134                          */
1135                         blksz = round_bufsz( (sndbuf_getbps(bs) *
1136                                 sndbuf_getspd(bs)) / chn_targetirqrate,
1137                                 16, CHN_2NDBUFMAXSIZE / 2);
1138                         blkcnt = CHN_2NDBUFMAXSIZE / blksz;
1139                 } else { /* use previously defined value */
1140                         blkcnt = sndbuf_getblkcnt(bs);
1141                         blksz = sndbuf_getblksz(bs);
1142                 }
1143         } else {
1144                 /*
1145                  * use supplied values if reasonable. Note that here we
1146                  * might have blksz which is not a power of 2 if the
1147                  * ioctl() to compute it allows such values.
1148                  */
1149                 ret = EINVAL;
1150                 if ((blksz < 16) || (blkcnt < 2) || (blkcnt * blksz > CHN_2NDBUFMAXSIZE))
1151                         goto out;
1152                 ret = 0;
1153                 c->flags |= CHN_F_HAS_SIZE;
1154         }
1155
1156         reqblksz = blksz;
1157         if (reqblksz < sndbuf_getbps(bs))
1158                 reqblksz = sndbuf_getbps(bs);
1159         if (reqblksz % sndbuf_getbps(bs))
1160                 reqblksz -= reqblksz % sndbuf_getbps(bs);
1161
1162         /* adjust for different hw format/speed */
1163         /*
1164          * Now compute the approx irq rate for the given (soft) blksz,
1165          * reduce to the acceptable range and compute a corresponding blksz
1166          * for the hard buffer. Then set the channel's blocksize and
1167          * corresponding hardbuf value. The number of blocks used should
1168          * be set by the device-specific routine. In fact, even the
1169          * call to sndbuf_setblksz() should not be here! XXX
1170          */
1171
1172         irqhz = (sndbuf_getbps(bs) * sndbuf_getspd(bs)) / blksz;
1173         RANGE(irqhz, 16, 512);
1174
1175         maxsz = sndbuf_getmaxsize(b);
1176         if (maxsz == 0) /* virtual channels don't appear to allocate bufhard */
1177                 maxsz = CHN_2NDBUFMAXSIZE;
1178         blksz = round_bufsz( (sndbuf_getbps(b) * sndbuf_getspd(b)) / irqhz,
1179                         16, maxsz / 2);
1180
1181         /* Increase the size of bufsoft if before increasing bufhard. */
1182         maxsize = sndbuf_getsize(b);
1183         if (sndbuf_getsize(bs) > maxsize)
1184                 maxsize = sndbuf_getsize(bs);
1185         if (reqblksz * blkcnt > maxsize)
1186                 maxsize = reqblksz * blkcnt;
1187         if (sndbuf_getsize(bs) != maxsize || sndbuf_getblksz(bs) != reqblksz) {
1188                 ret = sndbuf_remalloc(bs, maxsize/reqblksz, reqblksz);
1189                 if (ret)
1190                         goto out1;
1191         }
1192
1193         CHN_UNLOCK(c);
1194         sndbuf_setblksz(b, CHANNEL_SETBLOCKSIZE(c->methods, c->devinfo, blksz));
1195         CHN_LOCK(c);
1196
1197         /* Decrease the size of bufsoft after decreasing bufhard. */
1198         maxsize = sndbuf_getsize(b);
1199         if (reqblksz * blkcnt > maxsize)
1200                 maxsize = reqblksz * blkcnt;
1201         if (maxsize > sndbuf_getsize(bs))
1202                 kprintf("Danger! %s bufsoft size increasing from %d to %d after CHANNEL_SETBLOCKSIZE()\n",
1203                     c->name, sndbuf_getsize(bs), maxsize);
1204         if (sndbuf_getsize(bs) != maxsize || sndbuf_getblksz(bs) != reqblksz) {
1205                 ret = sndbuf_remalloc(bs, maxsize/reqblksz, reqblksz);
1206                 if (ret)
1207                         goto out1;
1208         }
1209
1210         chn_resetbuf(c);
1211 out1:
1212         KASSERT(sndbuf_getsize(bs) ==  0 ||
1213             sndbuf_getsize(bs) >= sndbuf_getsize(b),
1214             ("%s(%s): bufsoft size %d < bufhard size %d, reqblksz=%d blksz=%d maxsize=%d blkcnt=%d",
1215             __func__, c->name, sndbuf_getsize(bs), sndbuf_getsize(b), reqblksz,
1216             blksz, maxsize, blkcnt));
1217 out:
1218         c->flags &= ~CHN_F_SETBLOCKSIZE;
1219 #if 0
1220         if (1) {
1221                 static uint32_t kk = 0;
1222                 printf("%u: b %d/%d/%d : (%d)%d/0x%0x | bs %d/%d/%d : (%d)%d/0x%0x\n", ++kk,
1223                         sndbuf_getsize(b), sndbuf_getblksz(b), sndbuf_getblkcnt(b),
1224                         sndbuf_getbps(b),
1225                         sndbuf_getspd(b), sndbuf_getfmt(b),
1226                         sndbuf_getsize(bs), sndbuf_getblksz(bs), sndbuf_getblkcnt(bs),
1227                         sndbuf_getbps(bs),
1228                         sndbuf_getspd(bs), sndbuf_getfmt(bs));
1229                 if (sndbuf_getsize(b) % sndbuf_getbps(b) ||
1230                                 sndbuf_getblksz(b) % sndbuf_getbps(b) ||
1231                                 sndbuf_getsize(bs) % sndbuf_getbps(bs) ||
1232                                 sndbuf_getblksz(b) % sndbuf_getbps(b)) {
1233                         printf("%u: bps/blksz alignment screwed!\n", kk);
1234                 }
1235         }
1236 #endif
1237         return ret;
1238 }
1239
1240 int
1241 chn_trigger(struct pcm_channel *c, int go)
1242 {
1243 #if NISA > 0
1244         struct snd_dbuf *b = c->bufhard;
1245 #endif
1246         int ret;
1247
1248         CHN_LOCKASSERT(c);
1249 #if NISA > 0
1250         if (SND_DMA(b) && (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD))
1251                 sndbuf_dmabounce(b);
1252 #endif
1253         ret = CHANNEL_TRIGGER(c->methods, c->devinfo, go);
1254
1255         return ret;
1256 }
1257
1258 int
1259 chn_getptr(struct pcm_channel *c)
1260 {
1261 #if 0
1262         int hwptr;
1263         int a = (1 << c->align) - 1;
1264
1265         CHN_LOCKASSERT(c);
1266         hwptr = (c->flags & CHN_F_TRIGGERED)? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
1267         /* don't allow unaligned values in the hwa ptr */
1268 #if 1
1269         hwptr &= ~a ; /* Apply channel align mask */
1270 #endif
1271         hwptr &= DMA_ALIGN_MASK; /* Apply DMA align mask */
1272         return hwptr;
1273 #endif
1274         int hwptr;
1275
1276         CHN_LOCKASSERT(c);
1277         hwptr = (c->flags & CHN_F_TRIGGERED)? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
1278         return (hwptr - (hwptr % sndbuf_getbps(c->bufhard)));
1279 }
1280
1281 struct pcmchan_caps *
1282 chn_getcaps(struct pcm_channel *c)
1283 {
1284         CHN_LOCKASSERT(c);
1285         return CHANNEL_GETCAPS(c->methods, c->devinfo);
1286 }
1287
1288 u_int32_t
1289 chn_getformats(struct pcm_channel *c)
1290 {
1291         u_int32_t *fmtlist, fmts;
1292         int i;
1293
1294         fmtlist = chn_getcaps(c)->fmtlist;
1295         fmts = 0;
1296         for (i = 0; fmtlist[i]; i++)
1297                 fmts |= fmtlist[i];
1298
1299         /* report software-supported formats */
1300         if (report_soft_formats)
1301                 fmts |= AFMT_MU_LAW|AFMT_A_LAW|AFMT_U32_LE|AFMT_U32_BE|
1302                     AFMT_S32_LE|AFMT_S32_BE|AFMT_U24_LE|AFMT_U24_BE|
1303                     AFMT_S24_LE|AFMT_S24_BE|AFMT_U16_LE|AFMT_U16_BE|
1304                     AFMT_S16_LE|AFMT_S16_BE|AFMT_U8|AFMT_S8;
1305
1306         return fmts;
1307 }
1308
1309 static int
1310 chn_buildfeeder(struct pcm_channel *c)
1311 {
1312         struct feeder_class *fc;
1313         struct pcm_feederdesc desc;
1314         u_int32_t tmp[2], type, flags, hwfmt, *fmtlist;
1315         int err;
1316
1317         CHN_LOCKASSERT(c);
1318         while (chn_removefeeder(c) == 0);
1319         KASSERT((c->feeder == NULL), ("feeder chain not empty"));
1320
1321         c->align = sndbuf_getalign(c->bufsoft);
1322
1323         if (SLIST_EMPTY(&c->children)) {
1324                 fc = feeder_getclass(NULL);
1325                 KASSERT(fc != NULL, ("can't find root feeder"));
1326
1327                 err = chn_addfeeder(c, fc, NULL);
1328                 if (err) {
1329                         DEB(kprintf("can't add root feeder, err %d\n", err));
1330
1331                         return err;
1332                 }
1333                 c->feeder->desc->out = c->format;
1334         } else {
1335                 if (c->flags & CHN_F_HAS_VCHAN) {
1336                         desc.type = FEEDER_MIXER;
1337                         desc.in = 0;
1338                 } else {
1339                         DEB(printf("can't decide which feeder type to use!\n"));
1340                         return EOPNOTSUPP;
1341                 }
1342                 desc.out = c->format;
1343                 desc.flags = 0;
1344                 fc = feeder_getclass(&desc);
1345                 if (fc == NULL) {
1346                         DEB(kprintf("can't find vchan feeder\n"));
1347
1348                         return EOPNOTSUPP;
1349                 }
1350
1351                 err = chn_addfeeder(c, fc, &desc);
1352                 if (err) {
1353                         DEB(kprintf("can't add vchan feeder, err %d\n", err));
1354
1355                         return err;
1356                 }
1357         }
1358         c->feederflags &= ~(1 << FEEDER_VOLUME);
1359         if (c->direction == PCMDIR_PLAY &&
1360                         !(c->flags & CHN_F_VIRTUAL) &&
1361                         c->parentsnddev && (c->parentsnddev->flags & SD_F_SOFTPCMVOL) &&
1362                         c->parentsnddev->mixer_dev)
1363                 c->feederflags |= 1 << FEEDER_VOLUME;
1364         flags = c->feederflags;
1365         fmtlist = chn_getcaps(c)->fmtlist;
1366
1367         DEB(kprintf("feederflags %x\n", flags));
1368
1369         for (type = FEEDER_RATE; type <= FEEDER_LAST; type++) {
1370                 if (flags & (1 << type)) {
1371                         desc.type = type;
1372                         desc.in = 0;
1373                         desc.out = 0;
1374                         desc.flags = 0;
1375                         DEB(kprintf("find feeder type %d, ", type));
1376                         fc = feeder_getclass(&desc);
1377                         DEB(kprintf("got %p\n", fc));
1378                         if (fc == NULL) {
1379                                 DEB(kprintf("can't find required feeder type %d\n", type));
1380
1381                                 return EOPNOTSUPP;
1382                         }
1383
1384                         DEB(kprintf("build fmtchain from 0x%08x to 0x%08x: ", c->feeder->desc->out, fc->desc->in));
1385                         tmp[0] = fc->desc->in;
1386                         tmp[1] = 0;
1387                         if (chn_fmtchain(c, tmp) == 0) {
1388                                 DEB(printf("failed\n"));
1389
1390                                 return ENODEV;
1391                         }
1392                         DEB(printf("ok\n"));
1393
1394                         err = chn_addfeeder(c, fc, fc->desc);
1395                         if (err) {
1396                                 DEB(kprintf("can't add feeder %p, output 0x%x, err %d\n", fc, fc->desc->out, err));
1397
1398                                 return err;
1399                         }
1400                         DEB(kprintf("added feeder %p, output 0x%x\n", fc, c->feeder->desc->out));
1401                 }
1402         }
1403
1404         if (c->direction == PCMDIR_REC) {
1405                 tmp[0] = c->format;
1406                 tmp[1] = 0;
1407                 hwfmt = chn_fmtchain(c, tmp);
1408         } else
1409                 hwfmt = chn_fmtchain(c, fmtlist);
1410
1411         if (hwfmt == 0 || !fmtvalid(hwfmt, fmtlist)) {
1412                 DEB(printf("Invalid hardware format: 0x%08x\n", hwfmt));
1413                 return ENODEV;
1414         }
1415
1416         sndbuf_setfmt(c->bufhard, hwfmt);
1417
1418         if ((flags & (1 << FEEDER_VOLUME))) {
1419                 struct dev_ioctl_args map;
1420                 u_int32_t parent = SOUND_MIXER_NONE;
1421                 int vol, left, right;
1422
1423                 vol = 100 | (100 << 8);
1424
1425                 CHN_UNLOCK(c);
1426                 /*
1427                  * XXX This is ugly! The way mixer subs being so secretive
1428                  * about its own internals force us to use this silly
1429                  * monkey trick.
1430                  */
1431                 map.a_head.a_dev = c->parentsnddev->mixer_dev;
1432                 map.a_cmd = MIXER_READ(SOUND_MIXER_PCM);
1433                 map.a_data = (caddr_t)&vol;
1434                 map.a_fflag = -1;
1435                 map.a_cred = NULL;
1436                 if (mixer_ioctl(&map) != 0)
1437                         device_printf(c->dev, "Soft PCM Volume: Failed to read default value\n");
1438                 left = vol & 0x7f;
1439                 right = (vol >> 8) & 0x7f;
1440                 if (c->parentsnddev != NULL &&
1441                     c->parentsnddev->mixer_dev != NULL &&
1442                     c->parentsnddev->mixer_dev->si_drv1 != NULL)
1443                         parent = mix_getparent(
1444                             c->parentsnddev->mixer_dev->si_drv1,
1445                             SOUND_MIXER_PCM);
1446                 if (parent != SOUND_MIXER_NONE) {
1447                         vol = 100 | (100 << 8);
1448                         map.a_head.a_dev = c->parentsnddev->mixer_dev;
1449                         map.a_cmd = MIXER_READ(parent);
1450                         map.a_data = (caddr_t)&vol;
1451                         map.a_fflag = -1;
1452                         map.a_cred = NULL;
1453                         if (mixer_ioctl(&map) != 0)
1454                                 device_printf(c->dev, "Soft Volume: Failed to read parent default value\n");
1455                         left = (left * (vol & 0x7f)) / 100;
1456                         right = (right * ((vol >> 8) & 0x7f)) / 100;
1457                 }
1458
1459                 CHN_LOCK(c);
1460                 chn_setvolume(c, left, right);
1461         }
1462
1463         return 0;
1464 }
1465
1466 int
1467 chn_notify(struct pcm_channel *c, u_int32_t flags)
1468 {
1469         struct pcmchan_children *pce;
1470         struct pcm_channel *child;
1471         int run;
1472
1473         CHN_LOCK(c);
1474
1475         if (SLIST_EMPTY(&c->children)) {
1476                 CHN_UNLOCK(c);
1477                 return ENODEV;
1478         }
1479
1480         run = (c->flags & CHN_F_TRIGGERED)? 1 : 0;
1481         /*
1482          * if the hwchan is running, we can't change its rate, format or
1483          * blocksize
1484          */
1485         if (run)
1486                 flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
1487
1488         if (flags & CHN_N_RATE) {
1489                 /*
1490                  * we could do something here, like scan children and decide on
1491                  * the most appropriate rate to mix at, but we don't for now
1492                  */
1493         }
1494         if (flags & CHN_N_FORMAT) {
1495                 /*
1496                  * we could do something here, like scan children and decide on
1497                  * the most appropriate mixer feeder to use, but we don't for now
1498                  */
1499         }
1500         if (flags & CHN_N_VOLUME) {
1501                 /*
1502                  * we could do something here but we don't for now
1503                  */
1504         }
1505         if (flags & CHN_N_BLOCKSIZE) {
1506                 int blksz;
1507                 /*
1508                  * scan the children, find the lowest blocksize and use that
1509                  * for the hard blocksize
1510                  */
1511                 blksz = sndbuf_getmaxsize(c->bufhard) / 2;
1512                 SLIST_FOREACH(pce, &c->children, link) {
1513                         child = pce->channel;
1514                         CHN_LOCK(child);
1515                         if (sndbuf_getblksz(child->bufhard) < blksz)
1516                                 blksz = sndbuf_getblksz(child->bufhard);
1517                         CHN_UNLOCK(child);
1518                 }
1519                 chn_setblocksize(c, 2, blksz);
1520         }
1521         if (flags & CHN_N_TRIGGER) {
1522                 int nrun;
1523                 /*
1524                  * scan the children, and figure out if any are running
1525                  * if so, we need to be running, otherwise we need to be stopped
1526                  * if we aren't in our target sstate, move to it
1527                  */
1528                 nrun = 0;
1529                 SLIST_FOREACH(pce, &c->children, link) {
1530                         child = pce->channel;
1531                         CHN_LOCK(child);
1532                         if (child->flags & CHN_F_TRIGGERED)
1533                                 nrun = 1;
1534                         CHN_UNLOCK(child);
1535                 }
1536                 if (nrun && !run)
1537                         chn_start(c, 1);
1538                 if (!nrun && run)
1539                         chn_abort(c);
1540         }
1541         CHN_UNLOCK(c);
1542         return 0;
1543 }
1544
1545 void
1546 chn_lock(struct pcm_channel *c)
1547 {
1548         CHN_LOCK(c);
1549 }
1550
1551 void
1552 chn_unlock(struct pcm_channel *c)
1553 {
1554         CHN_UNLOCK(c);
1555 }