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[media] dvb_demux: fix deadlock in dmx_section_feed_release_filter()
[deliverable/linux.git] / drivers / media / dvb-core / dvb_demux.c
1 /*
2 * dvb_demux.c - DVB kernel demux API
3 *
4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de>
5 * & Marcus Metzler <marcus@convergence.de>
6 * for convergence integrated media GmbH
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 */
23
24 #include <linux/sched.h>
25 #include <linux/spinlock.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/module.h>
29 #include <linux/poll.h>
30 #include <linux/string.h>
31 #include <linux/crc32.h>
32 #include <asm/uaccess.h>
33 #include <asm/div64.h>
34
35 #include "dvb_demux.h"
36
37 #define NOBUFS
38 /*
39 ** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog
40 */
41 // #define DVB_DEMUX_SECTION_LOSS_LOG
42
43 static int dvb_demux_tscheck;
44 module_param(dvb_demux_tscheck, int, 0644);
45 MODULE_PARM_DESC(dvb_demux_tscheck,
46 "enable transport stream continuity and TEI check");
47
48 static int dvb_demux_speedcheck;
49 module_param(dvb_demux_speedcheck, int, 0644);
50 MODULE_PARM_DESC(dvb_demux_speedcheck,
51 "enable transport stream speed check");
52
53 static int dvb_demux_feed_err_pkts = 1;
54 module_param(dvb_demux_feed_err_pkts, int, 0644);
55 MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
56 "when set to 0, drop packets with the TEI bit set (1 by default)");
57
58 #define dprintk_tscheck(x...) do { \
59 if (dvb_demux_tscheck && printk_ratelimit()) \
60 printk(x); \
61 } while (0)
62
63 /******************************************************************************
64 * static inlined helper functions
65 ******************************************************************************/
66
67 static inline u16 section_length(const u8 *buf)
68 {
69 return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
70 }
71
72 static inline u16 ts_pid(const u8 *buf)
73 {
74 return ((buf[1] & 0x1f) << 8) + buf[2];
75 }
76
77 static inline u8 payload(const u8 *tsp)
78 {
79 if (!(tsp[3] & 0x10)) // no payload?
80 return 0;
81
82 if (tsp[3] & 0x20) { // adaptation field?
83 if (tsp[4] > 183) // corrupted data?
84 return 0;
85 else
86 return 184 - 1 - tsp[4];
87 }
88
89 return 184;
90 }
91
92 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
93 {
94 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
95 }
96
97 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
98 size_t len)
99 {
100 memcpy(d, s, len);
101 }
102
103 /******************************************************************************
104 * Software filter functions
105 ******************************************************************************/
106
107 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
108 const u8 *buf)
109 {
110 int count = payload(buf);
111 int p;
112 //int ccok;
113 //u8 cc;
114
115 if (count == 0)
116 return -1;
117
118 p = 188 - count;
119
120 /*
121 cc = buf[3] & 0x0f;
122 ccok = ((feed->cc + 1) & 0x0f) == cc;
123 feed->cc = cc;
124 if (!ccok)
125 printk("missed packet!\n");
126 */
127
128 if (buf[1] & 0x40) // PUSI ?
129 feed->peslen = 0xfffa;
130
131 feed->peslen += count;
132
133 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK);
134 }
135
136 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
137 struct dvb_demux_filter *f)
138 {
139 u8 neq = 0;
140 int i;
141
142 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
143 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
144
145 if (f->maskandmode[i] & xor)
146 return 0;
147
148 neq |= f->maskandnotmode[i] & xor;
149 }
150
151 if (f->doneq && !neq)
152 return 0;
153
154 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
155 NULL, 0, &f->filter, DMX_OK);
156 }
157
158 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
159 {
160 struct dvb_demux *demux = feed->demux;
161 struct dvb_demux_filter *f = feed->filter;
162 struct dmx_section_feed *sec = &feed->feed.sec;
163 int section_syntax_indicator;
164
165 if (!sec->is_filtering)
166 return 0;
167
168 if (!f)
169 return 0;
170
171 if (sec->check_crc) {
172 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
173 if (section_syntax_indicator &&
174 demux->check_crc32(feed, sec->secbuf, sec->seclen))
175 return -1;
176 }
177
178 do {
179 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
180 return -1;
181 } while ((f = f->next) && sec->is_filtering);
182
183 sec->seclen = 0;
184
185 return 0;
186 }
187
188 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
189 {
190 struct dmx_section_feed *sec = &feed->feed.sec;
191
192 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
193 if (sec->secbufp < sec->tsfeedp) {
194 int i, n = sec->tsfeedp - sec->secbufp;
195
196 /*
197 * Section padding is done with 0xff bytes entirely.
198 * Due to speed reasons, we won't check all of them
199 * but just first and last.
200 */
201 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
202 printk("dvb_demux.c section ts padding loss: %d/%d\n",
203 n, sec->tsfeedp);
204 printk("dvb_demux.c pad data:");
205 for (i = 0; i < n; i++)
206 printk(" %02x", sec->secbuf[i]);
207 printk("\n");
208 }
209 }
210 #endif
211
212 sec->tsfeedp = sec->secbufp = sec->seclen = 0;
213 sec->secbuf = sec->secbuf_base;
214 }
215
216 /*
217 * Losless Section Demux 1.4.1 by Emard
218 * Valsecchi Patrick:
219 * - middle of section A (no PUSI)
220 * - end of section A and start of section B
221 * (with PUSI pointing to the start of the second section)
222 *
223 * In this case, without feed->pusi_seen you'll receive a garbage section
224 * consisting of the end of section A. Basically because tsfeedp
225 * is incemented and the use=0 condition is not raised
226 * when the second packet arrives.
227 *
228 * Fix:
229 * when demux is started, let feed->pusi_seen = 0 to
230 * prevent initial feeding of garbage from the end of
231 * previous section. When you for the first time see PUSI=1
232 * then set feed->pusi_seen = 1
233 */
234 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
235 const u8 *buf, u8 len)
236 {
237 struct dvb_demux *demux = feed->demux;
238 struct dmx_section_feed *sec = &feed->feed.sec;
239 u16 limit, seclen, n;
240
241 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
242 return 0;
243
244 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
245 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
246 printk("dvb_demux.c section buffer full loss: %d/%d\n",
247 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
248 DMX_MAX_SECFEED_SIZE);
249 #endif
250 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
251 }
252
253 if (len <= 0)
254 return 0;
255
256 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
257 sec->tsfeedp += len;
258
259 /*
260 * Dump all the sections we can find in the data (Emard)
261 */
262 limit = sec->tsfeedp;
263 if (limit > DMX_MAX_SECFEED_SIZE)
264 return -1; /* internal error should never happen */
265
266 /* to be sure always set secbuf */
267 sec->secbuf = sec->secbuf_base + sec->secbufp;
268
269 for (n = 0; sec->secbufp + 2 < limit; n++) {
270 seclen = section_length(sec->secbuf);
271 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
272 || seclen + sec->secbufp > limit)
273 return 0;
274 sec->seclen = seclen;
275 sec->crc_val = ~0;
276 /* dump [secbuf .. secbuf+seclen) */
277 if (feed->pusi_seen)
278 dvb_dmx_swfilter_section_feed(feed);
279 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
280 else
281 printk("dvb_demux.c pusi not seen, discarding section data\n");
282 #endif
283 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
284 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */
285 }
286
287 return 0;
288 }
289
290 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
291 const u8 *buf)
292 {
293 u8 p, count;
294 int ccok, dc_i = 0;
295 u8 cc;
296
297 count = payload(buf);
298
299 if (count == 0) /* count == 0 if no payload or out of range */
300 return -1;
301
302 p = 188 - count; /* payload start */
303
304 cc = buf[3] & 0x0f;
305 ccok = ((feed->cc + 1) & 0x0f) == cc;
306 feed->cc = cc;
307
308 if (buf[3] & 0x20) {
309 /* adaption field present, check for discontinuity_indicator */
310 if ((buf[4] > 0) && (buf[5] & 0x80))
311 dc_i = 1;
312 }
313
314 if (!ccok || dc_i) {
315 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
316 printk("dvb_demux.c discontinuity detected %d bytes lost\n",
317 count);
318 /*
319 * those bytes under sume circumstances will again be reported
320 * in the following dvb_dmx_swfilter_section_new
321 */
322 #endif
323 /*
324 * Discontinuity detected. Reset pusi_seen = 0 to
325 * stop feeding of suspicious data until next PUSI=1 arrives
326 */
327 feed->pusi_seen = 0;
328 dvb_dmx_swfilter_section_new(feed);
329 }
330
331 if (buf[1] & 0x40) {
332 /* PUSI=1 (is set), section boundary is here */
333 if (count > 1 && buf[p] < count) {
334 const u8 *before = &buf[p + 1];
335 u8 before_len = buf[p];
336 const u8 *after = &before[before_len];
337 u8 after_len = count - 1 - before_len;
338
339 dvb_dmx_swfilter_section_copy_dump(feed, before,
340 before_len);
341 /* before start of new section, set pusi_seen = 1 */
342 feed->pusi_seen = 1;
343 dvb_dmx_swfilter_section_new(feed);
344 dvb_dmx_swfilter_section_copy_dump(feed, after,
345 after_len);
346 }
347 #ifdef DVB_DEMUX_SECTION_LOSS_LOG
348 else if (count > 0)
349 printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count);
350 #endif
351 } else {
352 /* PUSI=0 (is not set), no section boundary */
353 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
354 }
355
356 return 0;
357 }
358
359 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
360 const u8 *buf)
361 {
362 switch (feed->type) {
363 case DMX_TYPE_TS:
364 if (!feed->feed.ts.is_filtering)
365 break;
366 if (feed->ts_type & TS_PACKET) {
367 if (feed->ts_type & TS_PAYLOAD_ONLY)
368 dvb_dmx_swfilter_payload(feed, buf);
369 else
370 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
371 DMX_OK);
372 }
373 if (feed->ts_type & TS_DECODER)
374 if (feed->demux->write_to_decoder)
375 feed->demux->write_to_decoder(feed, buf, 188);
376 break;
377
378 case DMX_TYPE_SEC:
379 if (!feed->feed.sec.is_filtering)
380 break;
381 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
382 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
383 break;
384
385 default:
386 break;
387 }
388 }
389
390 #define DVR_FEED(f) \
391 (((f)->type == DMX_TYPE_TS) && \
392 ((f)->feed.ts.is_filtering) && \
393 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
394
395 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
396 {
397 struct dvb_demux_feed *feed;
398 u16 pid = ts_pid(buf);
399 int dvr_done = 0;
400
401 if (dvb_demux_speedcheck) {
402 struct timespec cur_time, delta_time;
403 u64 speed_bytes, speed_timedelta;
404
405 demux->speed_pkts_cnt++;
406
407 /* show speed every SPEED_PKTS_INTERVAL packets */
408 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
409 cur_time = current_kernel_time();
410
411 if (demux->speed_last_time.tv_sec != 0 &&
412 demux->speed_last_time.tv_nsec != 0) {
413 delta_time = timespec_sub(cur_time,
414 demux->speed_last_time);
415 speed_bytes = (u64)demux->speed_pkts_cnt
416 * 188 * 8;
417 /* convert to 1024 basis */
418 speed_bytes = 1000 * div64_u64(speed_bytes,
419 1024);
420 speed_timedelta =
421 (u64)timespec_to_ns(&delta_time);
422 speed_timedelta = div64_u64(speed_timedelta,
423 1000000); /* nsec -> usec */
424 printk(KERN_INFO "TS speed %llu Kbits/sec \n",
425 div64_u64(speed_bytes,
426 speed_timedelta));
427 }
428
429 demux->speed_last_time = cur_time;
430 demux->speed_pkts_cnt = 0;
431 }
432 }
433
434 if (buf[1] & 0x80) {
435 dprintk_tscheck("TEI detected. "
436 "PID=0x%x data1=0x%x\n",
437 pid, buf[1]);
438 /* data in this packet cant be trusted - drop it unless
439 * module option dvb_demux_feed_err_pkts is set */
440 if (!dvb_demux_feed_err_pkts)
441 return;
442 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
443 if (demux->cnt_storage && dvb_demux_tscheck) {
444 /* check pkt counter */
445 if (pid < MAX_PID) {
446 if (buf[3] & 0x10)
447 demux->cnt_storage[pid] =
448 (demux->cnt_storage[pid] + 1) & 0xf;
449
450 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
451 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
452 pid, demux->cnt_storage[pid],
453 buf[3] & 0xf);
454 demux->cnt_storage[pid] = buf[3] & 0xf;
455 }
456 }
457 /* end check */
458 }
459
460 list_for_each_entry(feed, &demux->feed_list, list_head) {
461 if ((feed->pid != pid) && (feed->pid != 0x2000))
462 continue;
463
464 /* copy each packet only once to the dvr device, even
465 * if a PID is in multiple filters (e.g. video + PCR) */
466 if ((DVR_FEED(feed)) && (dvr_done++))
467 continue;
468
469 if (feed->pid == pid)
470 dvb_dmx_swfilter_packet_type(feed, buf);
471 else if (feed->pid == 0x2000)
472 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK);
473 }
474 }
475
476 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
477 size_t count)
478 {
479 unsigned long flags;
480
481 spin_lock_irqsave(&demux->lock, flags);
482
483 while (count--) {
484 if (buf[0] == 0x47)
485 dvb_dmx_swfilter_packet(demux, buf);
486 buf += 188;
487 }
488
489 spin_unlock_irqrestore(&demux->lock, flags);
490 }
491
492 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
493
494 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
495 const int pktsize)
496 {
497 int start = pos, lost;
498
499 while (pos < count) {
500 if (buf[pos] == 0x47 ||
501 (pktsize == 204 && buf[pos] == 0xB8))
502 break;
503 pos++;
504 }
505
506 lost = pos - start;
507 if (lost) {
508 /* This garbage is part of a valid packet? */
509 int backtrack = pos - pktsize;
510 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
511 (pktsize == 204 && buf[backtrack] == 0xB8)))
512 return backtrack;
513 }
514
515 return pos;
516 }
517
518 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
519 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
520 size_t count, const int pktsize)
521 {
522 int p = 0, i, j;
523 const u8 *q;
524 unsigned long flags;
525
526 spin_lock_irqsave(&demux->lock, flags);
527
528 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
529 i = demux->tsbufp;
530 j = pktsize - i;
531 if (count < j) {
532 memcpy(&demux->tsbuf[i], buf, count);
533 demux->tsbufp += count;
534 goto bailout;
535 }
536 memcpy(&demux->tsbuf[i], buf, j);
537 if (demux->tsbuf[0] == 0x47) /* double check */
538 dvb_dmx_swfilter_packet(demux, demux->tsbuf);
539 demux->tsbufp = 0;
540 p += j;
541 }
542
543 while (1) {
544 p = find_next_packet(buf, p, count, pktsize);
545 if (p >= count)
546 break;
547 if (count - p < pktsize)
548 break;
549
550 q = &buf[p];
551
552 if (pktsize == 204 && (*q == 0xB8)) {
553 memcpy(demux->tsbuf, q, 188);
554 demux->tsbuf[0] = 0x47;
555 q = demux->tsbuf;
556 }
557 dvb_dmx_swfilter_packet(demux, q);
558 p += pktsize;
559 }
560
561 i = count - p;
562 if (i) {
563 memcpy(demux->tsbuf, &buf[p], i);
564 demux->tsbufp = i;
565 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
566 demux->tsbuf[0] = 0x47;
567 }
568
569 bailout:
570 spin_unlock_irqrestore(&demux->lock, flags);
571 }
572
573 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
574 {
575 _dvb_dmx_swfilter(demux, buf, count, 188);
576 }
577 EXPORT_SYMBOL(dvb_dmx_swfilter);
578
579 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
580 {
581 _dvb_dmx_swfilter(demux, buf, count, 204);
582 }
583 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
584
585 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
586 {
587 unsigned long flags;
588
589 spin_lock_irqsave(&demux->lock, flags);
590
591 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK);
592
593 spin_unlock_irqrestore(&demux->lock, flags);
594 }
595 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
596
597 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
598 {
599 int i;
600
601 for (i = 0; i < demux->filternum; i++)
602 if (demux->filter[i].state == DMX_STATE_FREE)
603 break;
604
605 if (i == demux->filternum)
606 return NULL;
607
608 demux->filter[i].state = DMX_STATE_ALLOCATED;
609
610 return &demux->filter[i];
611 }
612
613 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
614 {
615 int i;
616
617 for (i = 0; i < demux->feednum; i++)
618 if (demux->feed[i].state == DMX_STATE_FREE)
619 break;
620
621 if (i == demux->feednum)
622 return NULL;
623
624 demux->feed[i].state = DMX_STATE_ALLOCATED;
625
626 return &demux->feed[i];
627 }
628
629 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
630 {
631 struct dvb_demux_feed *entry;
632
633 list_for_each_entry(entry, &feed->demux->feed_list, list_head)
634 if (entry == feed)
635 return 1;
636
637 return 0;
638 }
639
640 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
641 {
642 spin_lock_irq(&feed->demux->lock);
643 if (dvb_demux_feed_find(feed)) {
644 printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n",
645 __func__, feed->type, feed->state, feed->pid);
646 goto out;
647 }
648
649 list_add(&feed->list_head, &feed->demux->feed_list);
650 out:
651 spin_unlock_irq(&feed->demux->lock);
652 }
653
654 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
655 {
656 spin_lock_irq(&feed->demux->lock);
657 if (!(dvb_demux_feed_find(feed))) {
658 printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n",
659 __func__, feed->type, feed->state, feed->pid);
660 goto out;
661 }
662
663 list_del(&feed->list_head);
664 out:
665 spin_unlock_irq(&feed->demux->lock);
666 }
667
668 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
669 enum dmx_ts_pes pes_type,
670 size_t circular_buffer_size, struct timespec timeout)
671 {
672 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
673 struct dvb_demux *demux = feed->demux;
674
675 if (pid > DMX_MAX_PID)
676 return -EINVAL;
677
678 if (mutex_lock_interruptible(&demux->mutex))
679 return -ERESTARTSYS;
680
681 if (ts_type & TS_DECODER) {
682 if (pes_type >= DMX_PES_OTHER) {
683 mutex_unlock(&demux->mutex);
684 return -EINVAL;
685 }
686
687 if (demux->pesfilter[pes_type] &&
688 demux->pesfilter[pes_type] != feed) {
689 mutex_unlock(&demux->mutex);
690 return -EINVAL;
691 }
692
693 demux->pesfilter[pes_type] = feed;
694 demux->pids[pes_type] = pid;
695 }
696
697 dvb_demux_feed_add(feed);
698
699 feed->pid = pid;
700 feed->buffer_size = circular_buffer_size;
701 feed->timeout = timeout;
702 feed->ts_type = ts_type;
703 feed->pes_type = pes_type;
704
705 if (feed->buffer_size) {
706 #ifdef NOBUFS
707 feed->buffer = NULL;
708 #else
709 feed->buffer = vmalloc(feed->buffer_size);
710 if (!feed->buffer) {
711 mutex_unlock(&demux->mutex);
712 return -ENOMEM;
713 }
714 #endif
715 }
716
717 feed->state = DMX_STATE_READY;
718 mutex_unlock(&demux->mutex);
719
720 return 0;
721 }
722
723 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
724 {
725 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
726 struct dvb_demux *demux = feed->demux;
727 int ret;
728
729 if (mutex_lock_interruptible(&demux->mutex))
730 return -ERESTARTSYS;
731
732 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
733 mutex_unlock(&demux->mutex);
734 return -EINVAL;
735 }
736
737 if (!demux->start_feed) {
738 mutex_unlock(&demux->mutex);
739 return -ENODEV;
740 }
741
742 if ((ret = demux->start_feed(feed)) < 0) {
743 mutex_unlock(&demux->mutex);
744 return ret;
745 }
746
747 spin_lock_irq(&demux->lock);
748 ts_feed->is_filtering = 1;
749 feed->state = DMX_STATE_GO;
750 spin_unlock_irq(&demux->lock);
751 mutex_unlock(&demux->mutex);
752
753 return 0;
754 }
755
756 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
757 {
758 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
759 struct dvb_demux *demux = feed->demux;
760 int ret;
761
762 mutex_lock(&demux->mutex);
763
764 if (feed->state < DMX_STATE_GO) {
765 mutex_unlock(&demux->mutex);
766 return -EINVAL;
767 }
768
769 if (!demux->stop_feed) {
770 mutex_unlock(&demux->mutex);
771 return -ENODEV;
772 }
773
774 ret = demux->stop_feed(feed);
775
776 spin_lock_irq(&demux->lock);
777 ts_feed->is_filtering = 0;
778 feed->state = DMX_STATE_ALLOCATED;
779 spin_unlock_irq(&demux->lock);
780 mutex_unlock(&demux->mutex);
781
782 return ret;
783 }
784
785 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
786 struct dmx_ts_feed **ts_feed,
787 dmx_ts_cb callback)
788 {
789 struct dvb_demux *demux = (struct dvb_demux *)dmx;
790 struct dvb_demux_feed *feed;
791
792 if (mutex_lock_interruptible(&demux->mutex))
793 return -ERESTARTSYS;
794
795 if (!(feed = dvb_dmx_feed_alloc(demux))) {
796 mutex_unlock(&demux->mutex);
797 return -EBUSY;
798 }
799
800 feed->type = DMX_TYPE_TS;
801 feed->cb.ts = callback;
802 feed->demux = demux;
803 feed->pid = 0xffff;
804 feed->peslen = 0xfffa;
805 feed->buffer = NULL;
806
807 (*ts_feed) = &feed->feed.ts;
808 (*ts_feed)->parent = dmx;
809 (*ts_feed)->priv = NULL;
810 (*ts_feed)->is_filtering = 0;
811 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
812 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
813 (*ts_feed)->set = dmx_ts_feed_set;
814
815 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
816 feed->state = DMX_STATE_FREE;
817 mutex_unlock(&demux->mutex);
818 return -EBUSY;
819 }
820
821 feed->filter->type = DMX_TYPE_TS;
822 feed->filter->feed = feed;
823 feed->filter->state = DMX_STATE_READY;
824
825 mutex_unlock(&demux->mutex);
826
827 return 0;
828 }
829
830 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
831 struct dmx_ts_feed *ts_feed)
832 {
833 struct dvb_demux *demux = (struct dvb_demux *)dmx;
834 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
835
836 mutex_lock(&demux->mutex);
837
838 if (feed->state == DMX_STATE_FREE) {
839 mutex_unlock(&demux->mutex);
840 return -EINVAL;
841 }
842 #ifndef NOBUFS
843 vfree(feed->buffer);
844 feed->buffer = NULL;
845 #endif
846
847 feed->state = DMX_STATE_FREE;
848 feed->filter->state = DMX_STATE_FREE;
849
850 dvb_demux_feed_del(feed);
851
852 feed->pid = 0xffff;
853
854 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
855 demux->pesfilter[feed->pes_type] = NULL;
856
857 mutex_unlock(&demux->mutex);
858 return 0;
859 }
860
861 /******************************************************************************
862 * dmx_section_feed API calls
863 ******************************************************************************/
864
865 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
866 struct dmx_section_filter **filter)
867 {
868 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
869 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
870 struct dvb_demux_filter *dvbdmxfilter;
871
872 if (mutex_lock_interruptible(&dvbdemux->mutex))
873 return -ERESTARTSYS;
874
875 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
876 if (!dvbdmxfilter) {
877 mutex_unlock(&dvbdemux->mutex);
878 return -EBUSY;
879 }
880
881 spin_lock_irq(&dvbdemux->lock);
882 *filter = &dvbdmxfilter->filter;
883 (*filter)->parent = feed;
884 (*filter)->priv = NULL;
885 dvbdmxfilter->feed = dvbdmxfeed;
886 dvbdmxfilter->type = DMX_TYPE_SEC;
887 dvbdmxfilter->state = DMX_STATE_READY;
888 dvbdmxfilter->next = dvbdmxfeed->filter;
889 dvbdmxfeed->filter = dvbdmxfilter;
890 spin_unlock_irq(&dvbdemux->lock);
891
892 mutex_unlock(&dvbdemux->mutex);
893 return 0;
894 }
895
896 static int dmx_section_feed_set(struct dmx_section_feed *feed,
897 u16 pid, size_t circular_buffer_size,
898 int check_crc)
899 {
900 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
901 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
902
903 if (pid > 0x1fff)
904 return -EINVAL;
905
906 if (mutex_lock_interruptible(&dvbdmx->mutex))
907 return -ERESTARTSYS;
908
909 dvb_demux_feed_add(dvbdmxfeed);
910
911 dvbdmxfeed->pid = pid;
912 dvbdmxfeed->buffer_size = circular_buffer_size;
913 dvbdmxfeed->feed.sec.check_crc = check_crc;
914
915 #ifdef NOBUFS
916 dvbdmxfeed->buffer = NULL;
917 #else
918 dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size);
919 if (!dvbdmxfeed->buffer) {
920 mutex_unlock(&dvbdmx->mutex);
921 return -ENOMEM;
922 }
923 #endif
924
925 dvbdmxfeed->state = DMX_STATE_READY;
926 mutex_unlock(&dvbdmx->mutex);
927 return 0;
928 }
929
930 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
931 {
932 int i;
933 struct dvb_demux_filter *f;
934 struct dmx_section_filter *sf;
935 u8 mask, mode, doneq;
936
937 if (!(f = dvbdmxfeed->filter))
938 return;
939 do {
940 sf = &f->filter;
941 doneq = 0;
942 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
943 mode = sf->filter_mode[i];
944 mask = sf->filter_mask[i];
945 f->maskandmode[i] = mask & mode;
946 doneq |= f->maskandnotmode[i] = mask & ~mode;
947 }
948 f->doneq = doneq ? 1 : 0;
949 } while ((f = f->next));
950 }
951
952 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
953 {
954 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
955 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
956 int ret;
957
958 if (mutex_lock_interruptible(&dvbdmx->mutex))
959 return -ERESTARTSYS;
960
961 if (feed->is_filtering) {
962 mutex_unlock(&dvbdmx->mutex);
963 return -EBUSY;
964 }
965
966 if (!dvbdmxfeed->filter) {
967 mutex_unlock(&dvbdmx->mutex);
968 return -EINVAL;
969 }
970
971 dvbdmxfeed->feed.sec.tsfeedp = 0;
972 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
973 dvbdmxfeed->feed.sec.secbufp = 0;
974 dvbdmxfeed->feed.sec.seclen = 0;
975
976 if (!dvbdmx->start_feed) {
977 mutex_unlock(&dvbdmx->mutex);
978 return -ENODEV;
979 }
980
981 prepare_secfilters(dvbdmxfeed);
982
983 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
984 mutex_unlock(&dvbdmx->mutex);
985 return ret;
986 }
987
988 spin_lock_irq(&dvbdmx->lock);
989 feed->is_filtering = 1;
990 dvbdmxfeed->state = DMX_STATE_GO;
991 spin_unlock_irq(&dvbdmx->lock);
992
993 mutex_unlock(&dvbdmx->mutex);
994 return 0;
995 }
996
997 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
998 {
999 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1000 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1001 int ret;
1002
1003 mutex_lock(&dvbdmx->mutex);
1004
1005 if (!dvbdmx->stop_feed) {
1006 mutex_unlock(&dvbdmx->mutex);
1007 return -ENODEV;
1008 }
1009
1010 ret = dvbdmx->stop_feed(dvbdmxfeed);
1011
1012 spin_lock_irq(&dvbdmx->lock);
1013 dvbdmxfeed->state = DMX_STATE_READY;
1014 feed->is_filtering = 0;
1015 spin_unlock_irq(&dvbdmx->lock);
1016
1017 mutex_unlock(&dvbdmx->mutex);
1018 return ret;
1019 }
1020
1021 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1022 struct dmx_section_filter *filter)
1023 {
1024 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1025 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1026 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1027
1028 mutex_lock(&dvbdmx->mutex);
1029
1030 if (dvbdmxfilter->feed != dvbdmxfeed) {
1031 mutex_unlock(&dvbdmx->mutex);
1032 return -EINVAL;
1033 }
1034
1035 if (feed->is_filtering) {
1036 /* release dvbdmx->mutex as far as
1037 it is acquired by stop_filtering() itself */
1038 mutex_unlock(&dvbdmx->mutex);
1039 feed->stop_filtering(feed);
1040 mutex_lock(&dvbdmx->mutex);
1041 }
1042
1043 spin_lock_irq(&dvbdmx->lock);
1044 f = dvbdmxfeed->filter;
1045
1046 if (f == dvbdmxfilter) {
1047 dvbdmxfeed->filter = dvbdmxfilter->next;
1048 } else {
1049 while (f->next != dvbdmxfilter)
1050 f = f->next;
1051 f->next = f->next->next;
1052 }
1053
1054 dvbdmxfilter->state = DMX_STATE_FREE;
1055 spin_unlock_irq(&dvbdmx->lock);
1056 mutex_unlock(&dvbdmx->mutex);
1057 return 0;
1058 }
1059
1060 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1061 struct dmx_section_feed **feed,
1062 dmx_section_cb callback)
1063 {
1064 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1065 struct dvb_demux_feed *dvbdmxfeed;
1066
1067 if (mutex_lock_interruptible(&dvbdmx->mutex))
1068 return -ERESTARTSYS;
1069
1070 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1071 mutex_unlock(&dvbdmx->mutex);
1072 return -EBUSY;
1073 }
1074
1075 dvbdmxfeed->type = DMX_TYPE_SEC;
1076 dvbdmxfeed->cb.sec = callback;
1077 dvbdmxfeed->demux = dvbdmx;
1078 dvbdmxfeed->pid = 0xffff;
1079 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1080 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1081 dvbdmxfeed->feed.sec.tsfeedp = 0;
1082 dvbdmxfeed->filter = NULL;
1083 dvbdmxfeed->buffer = NULL;
1084
1085 (*feed) = &dvbdmxfeed->feed.sec;
1086 (*feed)->is_filtering = 0;
1087 (*feed)->parent = demux;
1088 (*feed)->priv = NULL;
1089
1090 (*feed)->set = dmx_section_feed_set;
1091 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1092 (*feed)->start_filtering = dmx_section_feed_start_filtering;
1093 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1094 (*feed)->release_filter = dmx_section_feed_release_filter;
1095
1096 mutex_unlock(&dvbdmx->mutex);
1097 return 0;
1098 }
1099
1100 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1101 struct dmx_section_feed *feed)
1102 {
1103 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1104 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1105
1106 mutex_lock(&dvbdmx->mutex);
1107
1108 if (dvbdmxfeed->state == DMX_STATE_FREE) {
1109 mutex_unlock(&dvbdmx->mutex);
1110 return -EINVAL;
1111 }
1112 #ifndef NOBUFS
1113 vfree(dvbdmxfeed->buffer);
1114 dvbdmxfeed->buffer = NULL;
1115 #endif
1116 dvbdmxfeed->state = DMX_STATE_FREE;
1117
1118 dvb_demux_feed_del(dvbdmxfeed);
1119
1120 dvbdmxfeed->pid = 0xffff;
1121
1122 mutex_unlock(&dvbdmx->mutex);
1123 return 0;
1124 }
1125
1126 /******************************************************************************
1127 * dvb_demux kernel data API calls
1128 ******************************************************************************/
1129
1130 static int dvbdmx_open(struct dmx_demux *demux)
1131 {
1132 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1133
1134 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1135 return -EUSERS;
1136
1137 dvbdemux->users++;
1138 return 0;
1139 }
1140
1141 static int dvbdmx_close(struct dmx_demux *demux)
1142 {
1143 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1144
1145 if (dvbdemux->users == 0)
1146 return -ENODEV;
1147
1148 dvbdemux->users--;
1149 //FIXME: release any unneeded resources if users==0
1150 return 0;
1151 }
1152
1153 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1154 {
1155 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1156 void *p;
1157
1158 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1159 return -EINVAL;
1160
1161 p = memdup_user(buf, count);
1162 if (IS_ERR(p))
1163 return PTR_ERR(p);
1164 if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1165 kfree(p);
1166 return -ERESTARTSYS;
1167 }
1168 dvb_dmx_swfilter(dvbdemux, p, count);
1169 kfree(p);
1170 mutex_unlock(&dvbdemux->mutex);
1171
1172 if (signal_pending(current))
1173 return -EINTR;
1174 return count;
1175 }
1176
1177 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1178 struct dmx_frontend *frontend)
1179 {
1180 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1181 struct list_head *head = &dvbdemux->frontend_list;
1182
1183 list_add(&(frontend->connectivity_list), head);
1184
1185 return 0;
1186 }
1187
1188 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1189 struct dmx_frontend *frontend)
1190 {
1191 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1192 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1193
1194 list_for_each_safe(pos, n, head) {
1195 if (DMX_FE_ENTRY(pos) == frontend) {
1196 list_del(pos);
1197 return 0;
1198 }
1199 }
1200
1201 return -ENODEV;
1202 }
1203
1204 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1205 {
1206 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1207
1208 if (list_empty(&dvbdemux->frontend_list))
1209 return NULL;
1210
1211 return &dvbdemux->frontend_list;
1212 }
1213
1214 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1215 struct dmx_frontend *frontend)
1216 {
1217 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1218
1219 if (demux->frontend)
1220 return -EINVAL;
1221
1222 mutex_lock(&dvbdemux->mutex);
1223
1224 demux->frontend = frontend;
1225 mutex_unlock(&dvbdemux->mutex);
1226 return 0;
1227 }
1228
1229 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1230 {
1231 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1232
1233 mutex_lock(&dvbdemux->mutex);
1234
1235 demux->frontend = NULL;
1236 mutex_unlock(&dvbdemux->mutex);
1237 return 0;
1238 }
1239
1240 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1241 {
1242 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1243
1244 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1245 return 0;
1246 }
1247
1248 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1249 {
1250 int i;
1251 struct dmx_demux *dmx = &dvbdemux->dmx;
1252
1253 dvbdemux->cnt_storage = NULL;
1254 dvbdemux->users = 0;
1255 dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1256
1257 if (!dvbdemux->filter)
1258 return -ENOMEM;
1259
1260 dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1261 if (!dvbdemux->feed) {
1262 vfree(dvbdemux->filter);
1263 dvbdemux->filter = NULL;
1264 return -ENOMEM;
1265 }
1266 for (i = 0; i < dvbdemux->filternum; i++) {
1267 dvbdemux->filter[i].state = DMX_STATE_FREE;
1268 dvbdemux->filter[i].index = i;
1269 }
1270 for (i = 0; i < dvbdemux->feednum; i++) {
1271 dvbdemux->feed[i].state = DMX_STATE_FREE;
1272 dvbdemux->feed[i].index = i;
1273 }
1274
1275 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1276 if (!dvbdemux->cnt_storage)
1277 printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n");
1278
1279 INIT_LIST_HEAD(&dvbdemux->frontend_list);
1280
1281 for (i = 0; i < DMX_PES_OTHER; i++) {
1282 dvbdemux->pesfilter[i] = NULL;
1283 dvbdemux->pids[i] = 0xffff;
1284 }
1285
1286 INIT_LIST_HEAD(&dvbdemux->feed_list);
1287
1288 dvbdemux->playing = 0;
1289 dvbdemux->recording = 0;
1290 dvbdemux->tsbufp = 0;
1291
1292 if (!dvbdemux->check_crc32)
1293 dvbdemux->check_crc32 = dvb_dmx_crc32;
1294
1295 if (!dvbdemux->memcopy)
1296 dvbdemux->memcopy = dvb_dmx_memcopy;
1297
1298 dmx->frontend = NULL;
1299 dmx->priv = dvbdemux;
1300 dmx->open = dvbdmx_open;
1301 dmx->close = dvbdmx_close;
1302 dmx->write = dvbdmx_write;
1303 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1304 dmx->release_ts_feed = dvbdmx_release_ts_feed;
1305 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1306 dmx->release_section_feed = dvbdmx_release_section_feed;
1307
1308 dmx->add_frontend = dvbdmx_add_frontend;
1309 dmx->remove_frontend = dvbdmx_remove_frontend;
1310 dmx->get_frontends = dvbdmx_get_frontends;
1311 dmx->connect_frontend = dvbdmx_connect_frontend;
1312 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1313 dmx->get_pes_pids = dvbdmx_get_pes_pids;
1314
1315 mutex_init(&dvbdemux->mutex);
1316 spin_lock_init(&dvbdemux->lock);
1317
1318 return 0;
1319 }
1320
1321 EXPORT_SYMBOL(dvb_dmx_init);
1322
1323 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1324 {
1325 vfree(dvbdemux->cnt_storage);
1326 vfree(dvbdemux->filter);
1327 vfree(dvbdemux->feed);
1328 }
1329
1330 EXPORT_SYMBOL(dvb_dmx_release);
Linux kernel - Deliverables
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