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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/sound/core/pcm.c
....@@ -1,22 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  Digital Audio (PCM) abstract layer
34  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4
- *
5
- *
6
- *   This program is free software; you can redistribute it and/or modify
7
- *   it under the terms of the GNU General Public License as published by
8
- *   the Free Software Foundation; either version 2 of the License, or
9
- *   (at your option) any later version.
10
- *
11
- *   This program is distributed in the hope that it will be useful,
12
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- *   GNU General Public License for more details.
15
- *
16
- *   You should have received a copy of the GNU General Public License
17
- *   along with this program; if not, write to the Free Software
18
- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19
- *
205  */
216 
227 #include <linux/init.h>
....@@ -178,7 +163,7 @@
178163 
179164 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
180165 
181
-static char *snd_pcm_format_names[] = {
166
+static const char * const snd_pcm_format_names[] = {
182167 	FORMAT(S8),
183168 	FORMAT(U8),
184169 	FORMAT(S16_LE),
....@@ -252,12 +237,12 @@
252237 #define START(v) [SNDRV_PCM_START_##v] = #v
253238 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
254239 
255
-static char *snd_pcm_stream_names[] = {
240
+static const char * const snd_pcm_stream_names[] = {
256241 	STREAM(PLAYBACK),
257242 	STREAM(CAPTURE),
258243 };
259244 
260
-static char *snd_pcm_state_names[] = {
245
+static const char * const snd_pcm_state_names[] = {
261246 	STATE(OPEN),
262247 	STATE(SETUP),
263248 	STATE(PREPARED),
....@@ -268,7 +253,7 @@
268253 	STATE(SUSPENDED),
269254 };
270255 
271
-static char *snd_pcm_access_names[] = {
256
+static const char * const snd_pcm_access_names[] = {
272257 	ACCESS(MMAP_INTERLEAVED), 
273258 	ACCESS(MMAP_NONINTERLEAVED),
274259 	ACCESS(MMAP_COMPLEX),
....@@ -276,11 +261,11 @@
276261 	ACCESS(RW_NONINTERLEAVED),
277262 };
278263 
279
-static char *snd_pcm_subformat_names[] = {
264
+static const char * const snd_pcm_subformat_names[] = {
280265 	SUBFORMAT(STD), 
281266 };
282267 
283
-static char *snd_pcm_tstamp_mode_names[] = {
268
+static const char * const snd_pcm_tstamp_mode_names[] = {
284269 	TSTAMP(NONE),
285270 	TSTAMP(ENABLE),
286271 };
....@@ -458,7 +443,7 @@
458443 {
459444 	struct snd_pcm_substream *substream = entry->private_data;
460445 	struct snd_pcm_runtime *runtime;
461
-	struct snd_pcm_status status;
446
+	struct snd_pcm_status64 status;
462447 	int err;
463448 
464449 	mutex_lock(&substream->pcm->open_mutex);
....@@ -468,17 +453,17 @@
468453 		goto unlock;
469454 	}
470455 	memset(&status, 0, sizeof(status));
471
-	err = snd_pcm_status(substream, &status);
456
+	err = snd_pcm_status64(substream, &status);
472457 	if (err < 0) {
473458 		snd_iprintf(buffer, "error %d\n", err);
474459 		goto unlock;
475460 	}
476461 	snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
477462 	snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
478
-	snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
479
-		status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
480
-	snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
481
-		status.tstamp.tv_sec, status.tstamp.tv_nsec);
463
+	snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
464
+		status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
465
+	snd_iprintf(buffer, "tstamp      : %lld.%09lld\n",
466
+		status.tstamp_sec, status.tstamp_nsec);
482467 	snd_iprintf(buffer, "delay       : %ld\n", status.delay);
483468 	snd_iprintf(buffer, "avail       : %ld\n", status.avail);
484469 	snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
....@@ -528,50 +513,42 @@
528513 	if (!entry)
529514 		return -ENOMEM;
530515 	entry->mode = S_IFDIR | 0555;
531
-	if (snd_info_register(entry) < 0) {
532
-		snd_info_free_entry(entry);
533
-		return -ENOMEM;
534
-	}
535516 	pstr->proc_root = entry;
536517 	entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
537
-	if (entry) {
518
+	if (entry)
538519 		snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
539
-		if (snd_info_register(entry) < 0) {
540
-			snd_info_free_entry(entry);
541
-			entry = NULL;
542
-		}
543
-	}
544
-	pstr->proc_info_entry = entry;
545
-
546520 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
547521 	entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
548522 					   pstr->proc_root);
549523 	if (entry) {
550
-		entry->c.text.read = snd_pcm_xrun_debug_read;
524
+		snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
551525 		entry->c.text.write = snd_pcm_xrun_debug_write;
552526 		entry->mode |= 0200;
553
-		entry->private_data = pstr;
554
-		if (snd_info_register(entry) < 0) {
555
-			snd_info_free_entry(entry);
556
-			entry = NULL;
557
-		}
558527 	}
559
-	pstr->proc_xrun_debug_entry = entry;
560528 #endif
561529 	return 0;
562530 }
563531 
564532 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
565533 {
566
-#ifdef CONFIG_SND_PCM_XRUN_DEBUG
567
-	snd_info_free_entry(pstr->proc_xrun_debug_entry);
568
-	pstr->proc_xrun_debug_entry = NULL;
569
-#endif
570
-	snd_info_free_entry(pstr->proc_info_entry);
571
-	pstr->proc_info_entry = NULL;
572534 	snd_info_free_entry(pstr->proc_root);
573535 	pstr->proc_root = NULL;
574536 	return 0;
537
+}
538
+
539
+static struct snd_info_entry *
540
+create_substream_info_entry(struct snd_pcm_substream *substream,
541
+			    const char *name,
542
+			    void (*read)(struct snd_info_entry *,
543
+					 struct snd_info_buffer *))
544
+{
545
+	struct snd_info_entry *entry;
546
+
547
+	entry = snd_info_create_card_entry(substream->pcm->card, name,
548
+					   substream->proc_root);
549
+	if (entry)
550
+		snd_info_set_text_ops(entry, substream, read);
551
+	return entry;
575552 }
576553 
577554 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
....@@ -588,100 +565,60 @@
588565 	if (!entry)
589566 		return -ENOMEM;
590567 	entry->mode = S_IFDIR | 0555;
591
-	if (snd_info_register(entry) < 0) {
592
-		snd_info_free_entry(entry);
593
-		return -ENOMEM;
594
-	}
595568 	substream->proc_root = entry;
596
-	entry = snd_info_create_card_entry(card, "info", substream->proc_root);
597
-	if (entry) {
598
-		snd_info_set_text_ops(entry, substream,
599
-				      snd_pcm_substream_proc_info_read);
600
-		if (snd_info_register(entry) < 0) {
601
-			snd_info_free_entry(entry);
602
-			entry = NULL;
603
-		}
604
-	}
605
-	substream->proc_info_entry = entry;
606
-	entry = snd_info_create_card_entry(card, "hw_params",
607
-					   substream->proc_root);
608
-	if (entry) {
609
-		snd_info_set_text_ops(entry, substream,
610
-				      snd_pcm_substream_proc_hw_params_read);
611
-		if (snd_info_register(entry) < 0) {
612
-			snd_info_free_entry(entry);
613
-			entry = NULL;
614
-		}
615
-	}
616
-	substream->proc_hw_params_entry = entry;
617
-	entry = snd_info_create_card_entry(card, "sw_params",
618
-					   substream->proc_root);
619
-	if (entry) {
620
-		snd_info_set_text_ops(entry, substream,
621
-				      snd_pcm_substream_proc_sw_params_read);
622
-		if (snd_info_register(entry) < 0) {
623
-			snd_info_free_entry(entry);
624
-			entry = NULL;
625
-		}
626
-	}
627
-	substream->proc_sw_params_entry = entry;
628
-	entry = snd_info_create_card_entry(card, "status",
629
-					   substream->proc_root);
630
-	if (entry) {
631
-		snd_info_set_text_ops(entry, substream,
632
-				      snd_pcm_substream_proc_status_read);
633
-		if (snd_info_register(entry) < 0) {
634
-			snd_info_free_entry(entry);
635
-			entry = NULL;
636
-		}
637
-	}
638
-	substream->proc_status_entry = entry;
569
+
570
+	create_substream_info_entry(substream, "info",
571
+				    snd_pcm_substream_proc_info_read);
572
+	create_substream_info_entry(substream, "hw_params",
573
+				    snd_pcm_substream_proc_hw_params_read);
574
+	create_substream_info_entry(substream, "sw_params",
575
+				    snd_pcm_substream_proc_sw_params_read);
576
+	create_substream_info_entry(substream, "status",
577
+				    snd_pcm_substream_proc_status_read);
639578 
640579 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
641
-	entry = snd_info_create_card_entry(card, "xrun_injection",
642
-					   substream->proc_root);
580
+	entry = create_substream_info_entry(substream, "xrun_injection", NULL);
643581 	if (entry) {
644
-		entry->private_data = substream;
645
-		entry->c.text.read = NULL;
646582 		entry->c.text.write = snd_pcm_xrun_injection_write;
647583 		entry->mode = S_IFREG | 0200;
648
-		if (snd_info_register(entry) < 0) {
649
-			snd_info_free_entry(entry);
650
-			entry = NULL;
651
-		}
652584 	}
653
-	substream->proc_xrun_injection_entry = entry;
654585 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
655586 
656587 	return 0;
657588 }
658589 
659
-static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
660
-{
661
-	snd_info_free_entry(substream->proc_info_entry);
662
-	substream->proc_info_entry = NULL;
663
-	snd_info_free_entry(substream->proc_hw_params_entry);
664
-	substream->proc_hw_params_entry = NULL;
665
-	snd_info_free_entry(substream->proc_sw_params_entry);
666
-	substream->proc_sw_params_entry = NULL;
667
-	snd_info_free_entry(substream->proc_status_entry);
668
-	substream->proc_status_entry = NULL;
669
-#ifdef CONFIG_SND_PCM_XRUN_DEBUG
670
-	snd_info_free_entry(substream->proc_xrun_injection_entry);
671
-	substream->proc_xrun_injection_entry = NULL;
672
-#endif
673
-	snd_info_free_entry(substream->proc_root);
674
-	substream->proc_root = NULL;
675
-	return 0;
676
-}
677590 #else /* !CONFIG_SND_VERBOSE_PROCFS */
678591 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
679592 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
680593 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
681
-static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
682594 #endif /* CONFIG_SND_VERBOSE_PROCFS */
683595 
684596 static const struct attribute_group *pcm_dev_attr_groups[];
597
+
598
+/*
599
+ * PM callbacks: we need to deal only with suspend here, as the resume is
600
+ * triggered either from user-space or the driver's resume callback
601
+ */
602
+#ifdef CONFIG_PM_SLEEP
603
+static int do_pcm_suspend(struct device *dev)
604
+{
605
+	struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
606
+
607
+	if (!pstr->pcm->no_device_suspend)
608
+		snd_pcm_suspend_all(pstr->pcm);
609
+	return 0;
610
+}
611
+#endif
612
+
613
+static const struct dev_pm_ops pcm_dev_pm_ops = {
614
+	SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
615
+};
616
+
617
+/* device type for PCM -- basically only for passing PM callbacks */
618
+static const struct device_type pcm_dev_type = {
619
+	.name = "pcm",
620
+	.pm = &pcm_dev_pm_ops,
621
+};
685622 
686623 /**
687624  * snd_pcm_new_stream - create a new PCM stream
....@@ -713,6 +650,7 @@
713650 
714651 	snd_device_initialize(&pstr->dev, pcm->card);
715652 	pstr->dev.groups = pcm_dev_attr_groups;
653
+	pstr->dev.type = &pcm_dev_type;
716654 	dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
717655 		     stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
718656 
....@@ -753,9 +691,7 @@
753691 			}
754692 		}
755693 		substream->group = &substream->self_group;
756
-		spin_lock_init(&substream->self_group.lock);
757
-		mutex_init(&substream->self_group.mutex);
758
-		INIT_LIST_HEAD(&substream->self_group.substreams);
694
+		snd_pcm_group_init(&substream->self_group);
759695 		list_add_tail(&substream->link_list, &substream->self_group.substreams);
760696 		atomic_set(&substream->mmap_count, 0);
761697 		prev = substream;
....@@ -770,12 +706,12 @@
770706 {
771707 	struct snd_pcm *pcm;
772708 	int err;
773
-	static struct snd_device_ops ops = {
709
+	static const struct snd_device_ops ops = {
774710 		.dev_free = snd_pcm_dev_free,
775711 		.dev_register =	snd_pcm_dev_register,
776712 		.dev_disconnect = snd_pcm_dev_disconnect,
777713 	};
778
-	static struct snd_device_ops internal_ops = {
714
+	static const struct snd_device_ops internal_ops = {
779715 		.dev_free = snd_pcm_dev_free,
780716 	};
781717 
....@@ -881,14 +817,6 @@
881817 		up_write(&card->controls_rwsem);
882818 		pstr->chmap_kctl = NULL;
883819 	}
884
-	if (pstr->vol_kctl) {
885
-		snd_ctl_remove(pstr->pcm->card, pstr->vol_kctl);
886
-		pstr->vol_kctl = NULL;
887
-	}
888
-	if (pstr->usr_kctl) {
889
-		snd_ctl_remove(pstr->pcm->card, pstr->usr_kctl);
890
-		pstr->usr_kctl = NULL;
891
-	}
892820 }
893821 
894822 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
....@@ -897,15 +825,17 @@
897825 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
898826 	struct snd_pcm_oss_setup *setup, *setupn;
899827 #endif
828
+
829
+	/* free all proc files under the stream */
830
+	snd_pcm_stream_proc_done(pstr);
831
+
900832 	substream = pstr->substream;
901833 	while (substream) {
902834 		substream_next = substream->next;
903835 		snd_pcm_timer_done(substream);
904
-		snd_pcm_substream_proc_done(substream);
905836 		kfree(substream);
906837 		substream = substream_next;
907838 	}
908
-	snd_pcm_stream_proc_done(pstr);
909839 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
910840 	for (setup = pstr->oss.setup_list; setup; setup = setupn) {
911841 		setupn = setup->next;
....@@ -1018,27 +948,29 @@
1018948 		return -ENOMEM;
1019949 
1020950 	size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
1021
-	runtime->status = snd_malloc_pages(size, GFP_KERNEL);
951
+	runtime->status = alloc_pages_exact(size, GFP_KERNEL);
1022952 	if (runtime->status == NULL) {
1023953 		kfree(runtime);
1024954 		return -ENOMEM;
1025955 	}
1026
-	memset((void*)runtime->status, 0, size);
956
+	memset(runtime->status, 0, size);
1027957 
1028958 	size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1029
-	runtime->control = snd_malloc_pages(size, GFP_KERNEL);
959
+	runtime->control = alloc_pages_exact(size, GFP_KERNEL);
1030960 	if (runtime->control == NULL) {
1031
-		snd_free_pages((void*)runtime->status,
961
+		free_pages_exact(runtime->status,
1032962 			       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1033963 		kfree(runtime);
1034964 		return -ENOMEM;
1035965 	}
1036
-	memset((void*)runtime->control, 0, size);
966
+	memset(runtime->control, 0, size);
1037967 
1038968 	init_waitqueue_head(&runtime->sleep);
1039969 	init_waitqueue_head(&runtime->tsleep);
1040970 
1041971 	runtime->status->state = SNDRV_PCM_STATE_OPEN;
972
+	mutex_init(&runtime->buffer_mutex);
973
+	atomic_set(&runtime->buffer_accessing, 0);
1042974 
1043975 	substream->runtime = runtime;
1044976 	substream->private_data = pcm->private_data;
....@@ -1059,17 +991,20 @@
1059991 	runtime = substream->runtime;
1060992 	if (runtime->private_free != NULL)
1061993 		runtime->private_free(runtime);
1062
-	snd_free_pages((void*)runtime->status,
994
+	free_pages_exact(runtime->status,
1063995 		       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1064
-	snd_free_pages((void*)runtime->control,
996
+	free_pages_exact(runtime->control,
1065997 		       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1066998 	kfree(runtime->hw_constraints.rules);
1067999 	/* Avoid concurrent access to runtime via PCM timer interface */
1068
-	if (substream->timer)
1000
+	if (substream->timer) {
10691001 		spin_lock_irq(&substream->timer->lock);
1070
-	substream->runtime = NULL;
1071
-	if (substream->timer)
1002
+		substream->runtime = NULL;
10721003 		spin_unlock_irq(&substream->timer->lock);
1004
+	} else {
1005
+		substream->runtime = NULL;
1006
+	}
1007
+	mutex_destroy(&runtime->buffer_mutex);
10731008 	kfree(runtime);
10741009 	put_pid(substream->pid);
10751010 	substream->pid = NULL;
....@@ -1093,7 +1028,7 @@
10931028 		str = "none";
10941029 	else
10951030 		str = strs[pcm->dev_class];
1096
-        return snprintf(buf, PAGE_SIZE, "%s\n", str);
1031
+	return sprintf(buf, "%s\n", str);
10971032 }
10981033 
10991034 static DEVICE_ATTR(pcm_class, 0444, show_pcm_class, NULL);
....@@ -1183,6 +1118,10 @@
11831118 		}
11841119 	}
11851120 
1121
+	for (cidx = 0; cidx < 2; cidx++)
1122
+		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1123
+			snd_pcm_sync_stop(substream, false);
1124
+
11861125 	pcm_call_notify(pcm, n_disconnect);
11871126 	for (cidx = 0; cidx < 2; cidx++) {
11881127 		snd_unregister_device(&pcm->streams[cidx].dev);