sys/dev/sound/pcm/buffer.c

   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  * $DragonFly: src/sys/dev/sound/pcm/buffer.c,v 1.11 2008/01/06 16:55:51 swildner Exp $
  28  */
  29
  30 #include <dev/sound/pcm/sound.h>
  31
  32 #include "feeder_if.h"
  33
  34 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/buffer.c,v 1.11 2008/01/06 16:55:51 swildner Exp $");
  35
  36 /*
  37  * sndbuf_seltask is a taskqueue callback routine, called from
  38  * taskqueue_swi, which runs under the MP lock.
  39  *
  40  * The only purpose is to be able to selwakeup() from a sound
  41  * interrupt, which is running without MP lock held and thus
  42  * can't call selwakeup() directly.
  43  */
  44 static void
  45 sndbuf_seltask(void *context, int pending)
  46 {
  47         struct snd_dbuf *b = context;
  48
  49         selwakeup(sndbuf_getsel(b));
  50 }
  51
  52 struct snd_dbuf *
  53 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
  54 {
  55         struct snd_dbuf *b;
  56
  57         b = kmalloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
  58         ksnprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
  59         b->dev = dev;
  60         b->channel = channel;
  61         TASK_INIT(&b->seltask, 0, sndbuf_seltask, b);
  62
  63         return b;
  64 }
  65
  66 void
  67 sndbuf_destroy(struct snd_dbuf *b)
  68 {
  69         sndbuf_free(b);
  70         kfree(b, M_DEVBUF);
  71 }
  72
  73 bus_addr_t
  74 sndbuf_getbufaddr(struct snd_dbuf *buf)
  75 {
  76         return (buf->buf_addr);
  77 }
  78
  79 static void
  80 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  81 {
  82         struct snd_dbuf *b = (struct snd_dbuf *)arg;
  83
  84         if (bootverbose) {
  85                 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
  86                     (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
  87                 kprintf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
  88         }
  89         if (error == 0)
  90                 b->buf_addr = segs[0].ds_addr;
  91         else
  92                 b->buf_addr = 0;
  93 }
  94
  95 /*
  96  * Allocate memory for DMA buffer. If the device does not use DMA transfers,
  97  * the driver can call kmalloc(9) and sndbuf_setup() itself.
  98  */
  99
 100 int
 101 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
 102 {
 103         int ret;
 104
 105         b->dmatag = dmatag;
 106         b->maxsize = size;
 107         b->bufsize = b->maxsize;
 108         b->buf_addr = 0;
 109         b->flags |= SNDBUF_F_MANAGED;
 110         if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT,
 111             &b->dmamap)) {
 112                 sndbuf_free(b);
 113                 return (ENOMEM);
 114         }
 115         if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
 116             sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
 117                 sndbuf_free(b);
 118                 return (ENOMEM);
 119         }
 120
 121         ret = sndbuf_resize(b, 2, b->maxsize / 2);
 122         if (ret != 0)
 123                 sndbuf_free(b);
 124
 125         return (ret);
 126 }
 127
 128 int
 129 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
 130 {
 131         b->flags &= ~SNDBUF_F_MANAGED;
 132         if (buf)
 133                 b->flags |= SNDBUF_F_MANAGED;
 134         b->buf = buf;
 135         b->maxsize = size;
 136         b->bufsize = b->maxsize;
 137         return sndbuf_resize(b, 2, b->maxsize / 2);
 138 }
 139
 140 void
 141 sndbuf_free(struct snd_dbuf *b)
 142 {
 143         if (b->tmpbuf)
 144                 kfree(b->tmpbuf, M_DEVBUF);
 145         if (b->buf) {
 146                 if (b->flags & SNDBUF_F_MANAGED) {
 147                         if (b->dmamap)
 148                                 bus_dmamap_unload(b->dmatag, b->dmamap);
 149                         if (b->dmatag)
 150                                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
 151                 } else
 152                         kfree(b->buf, M_DEVBUF);
 153         }
 154
 155         b->tmpbuf = NULL;
 156         b->buf = NULL;
 157         b->dmatag = NULL;
 158         b->dmamap = NULL;
 159 }
 160
 161 int
 162 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
 163 {
 164         u_int8_t *tmpbuf, *f2;
 165
 166         chn_lock(b->channel);
 167         if (b->maxsize == 0)
 168                 goto out;
 169         if (blkcnt == 0)
 170                 blkcnt = b->blkcnt;
 171         if (blksz == 0)
 172                 blksz = b->blksz;
 173         if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
 174                 chn_unlock(b->channel);
 175                 return EINVAL;
 176         }
 177         if (blkcnt == b->blkcnt && blksz == b->blksz)
 178                 goto out;
 179
 180         chn_unlock(b->channel);
 181         tmpbuf = kmalloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT);
 182         if (tmpbuf == NULL)
 183                 return ENOMEM;
 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 selinfo *
 409 sndbuf_getsel(struct snd_dbuf *b)
 410 {
 411         return &b->sel;
 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 }