sound/core/pcm_memory.c - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  *  Digital Audio (PCM) abstract layer
  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
  *
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   (at your option) any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
  */

 #define __NO_VERSION__
 #include <sound/driver.h>
 #include <asm/io.h>
 #include <linux/time.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/info.h>
 #include <sound/initval.h>

 static int snd_preallocate_dma = 1;
 MODULE_PARM(snd_preallocate_dma, "i");
 MODULE_PARM_DESC(snd_preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized.");
 MODULE_PARM_SYNTAX(snd_preallocate_dma, SNDRV_BOOLEAN_TRUE_DESC);

 static int snd_maximum_substreams = 4;
 MODULE_PARM(snd_maximum_substreams, "i");
 MODULE_PARM_DESC(snd_maximum_substreams, "Maximum substreams with preallocated DMA memory.");
 MODULE_PARM_SYNTAX(snd_maximum_substreams, SNDRV_BOOLEAN_TRUE_DESC);

 static int snd_minimum_buffer = 16384;


 static void snd_pcm_lib_preallocate_dma_free(snd_pcm_substream_t *substream)
 {
 	if (substream->dma_area == NULL)
 		return;
 	switch (substream->dma_type) {
 	case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
 		snd_free_pages(substream->dma_area, substream->dma_bytes);
 		break;
 #ifdef CONFIG_ISA
 	case SNDRV_PCM_DMA_TYPE_ISA:
 		snd_free_isa_pages(substream->dma_bytes, substream->dma_area, substream->dma_addr);
 		break;
 #endif
 #ifdef CONFIG_PCI
 	case SNDRV_PCM_DMA_TYPE_PCI:
 		snd_free_pci_pages((struct pci_dev *)substream->dma_private, substream->dma_bytes, substream->dma_area, substream->dma_addr);
 		break;
 #endif
 	}
 	substream->dma_area = NULL;
 }

 int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream)
 {
 	snd_pcm_lib_preallocate_dma_free(substream);
 	if (substream->proc_prealloc_entry) {
 		snd_info_unregister(substream->proc_prealloc_entry);
 		substream->proc_prealloc_entry = NULL;
 	}
 	return 0;
 }

 int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm)
 {
 	snd_pcm_substream_t *substream;
 	int stream;

 	for (stream = 0; stream < 2; stream++)
 		for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
 			snd_pcm_lib_preallocate_free(substream);
 	return 0;
 }

 static void snd_pcm_lib_preallocate_proc_read(snd_info_entry_t *entry,
 					      snd_info_buffer_t *buffer)
 {
 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 	snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_bytes / 1024);
 }

 static void snd_pcm_lib_preallocate_proc_write(snd_info_entry_t *entry,
 					       snd_info_buffer_t *buffer)
 {
 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 	char line[64], str[64];
 	size_t size;
 	void *dma_area;
 	dma_addr_t dma_addr;

 	if (substream->runtime) {
 		buffer->error = -EBUSY;
 		return;
 	}
 	if (!snd_info_get_line(buffer, line, sizeof(line))) {
 		snd_info_get_str(str, line, sizeof(str));
 		size = simple_strtoul(str, NULL, 10) * 1024;
 		if ((size != 0 && size < 8192) || size > substream->dma_max) {
 			buffer->error = -EINVAL;
 			return;
 		}
 		if (substream->dma_bytes == size)
 			return;
 		if (size > 0) {
 			switch (substream->dma_type) {
 			case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
 				dma_area = snd_malloc_pages(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff));
 				dma_addr = 0UL;		/* not valid */
 				break;
 #ifdef CONFIG_ISA
 			case SNDRV_PCM_DMA_TYPE_ISA:
 				dma_area = snd_malloc_isa_pages(size, &dma_addr);
 				break;
 #endif
 #ifdef CONFIG_PCI
 			case SNDRV_PCM_DMA_TYPE_PCI:
 				dma_area = snd_malloc_pci_pages((struct pci_dev *)substream->dma_private, size, &dma_addr);
 				break;
 #endif
 			default:
 				dma_area = NULL;
 				dma_addr = 0UL;
 			}
 			if (dma_area == NULL) {
 				buffer->error = -ENOMEM;
 				return;
 			}
 			substream->buffer_bytes_max = size;
 		} else {
 			dma_area = NULL;
 			substream->buffer_bytes_max = UINT_MAX;
 		}
 		snd_pcm_lib_preallocate_dma_free(substream);
 		substream->dma_area = dma_area;
 		substream->dma_addr = dma_addr;
 		substream->dma_bytes = size;
 	} else {
 		buffer->error = -EINVAL;
 	}
 }

 static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
 					  size_t size, size_t max)
 {
 	unsigned long rsize = 0;
 	void *dma_area = NULL;
 	dma_addr_t dma_addr = 0UL;
 	snd_info_entry_t *entry;

 	if (!size || !snd_preallocate_dma || substream->number >= snd_maximum_substreams) {
 		size = 0;
 	} else {
 		switch (substream->dma_type) {
 		case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
 			dma_area = snd_malloc_pages_fallback(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff), &rsize);
 			dma_addr = 0UL;		/* not valid */
 			break;
 #ifdef CONFIG_ISA
 		case SNDRV_PCM_DMA_TYPE_ISA:
 			dma_area = snd_malloc_isa_pages_fallback(size, &dma_addr, &rsize);
 			break;
 #endif
 #ifdef CONFIG_PCI
 		case SNDRV_PCM_DMA_TYPE_PCI:
 			dma_area = snd_malloc_pci_pages_fallback((struct pci_dev *)substream->dma_private, size, &dma_addr, &rsize);
 			break;
 #endif
 		default:
 			size = 0;
 		}
 		if (rsize < snd_minimum_buffer) {
 			snd_pcm_lib_preallocate_dma_free(substream);
 			size = 0;
 		}
 	}
 	substream->dma_area = dma_area;
 	substream->dma_addr = dma_addr;
 	substream->dma_bytes = rsize;
 	if (rsize > 0)
 		substream->buffer_bytes_max = rsize;
 	substream->dma_max = max;
 	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
 		entry->c.text.read_size = 64;
 		entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
 		entry->c.text.write_size = 64;
 		entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
 		entry->private_data = substream;
 		if (snd_info_register(entry) < 0) {
 			snd_info_free_entry(entry);
 			entry = NULL;
 		}
 	}
 	substream->proc_prealloc_entry = entry;
 	return 0;
 }

 int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
 				      size_t size, size_t max,
 				      unsigned int flags)
 {
 	substream->dma_type = SNDRV_PCM_DMA_TYPE_CONTINUOUS;
 	substream->dma_private = (void *)(unsigned long)flags;
 	return snd_pcm_lib_preallocate_pages1(substream, size, max);
 }

 int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
 					  size_t size, size_t max,
 					  unsigned int flags)
 {
 	snd_pcm_substream_t *substream;
 	int stream, err;

 	for (stream = 0; stream < 2; stream++)
 		for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
 			if ((err = snd_pcm_lib_preallocate_pages(substream, size, max, flags)) < 0)
 				return err;
 	return 0;
 }

 #ifdef CONFIG_ISA
 int snd_pcm_lib_preallocate_isa_pages(snd_pcm_substream_t *substream,
 				      size_t size, size_t max)
 {
 	substream->dma_type = SNDRV_PCM_DMA_TYPE_ISA;
 	substream->dma_private = NULL;
 	return snd_pcm_lib_preallocate_pages1(substream, size, max);
 }

 int snd_pcm_lib_preallocate_isa_pages_for_all(snd_pcm_t *pcm,
 					      size_t size, size_t max)
 {
 	snd_pcm_substream_t *substream;
 	int stream, err;

 	for (stream = 0; stream < 2; stream++)
 		for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
 			if ((err = snd_pcm_lib_preallocate_isa_pages(substream, size, max)) < 0)
 				return err;
 	return 0;
 }
 #endif /* CONFIG_ISA */

 int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size)
 {
 	snd_pcm_runtime_t *runtime;
 	void *dma_area = NULL;
 	dma_addr_t dma_addr = 0UL;

 	snd_assert(substream != NULL, return -EINVAL);
 	runtime = substream->runtime;
 	snd_assert(runtime != NULL, return -EINVAL);
 	if (runtime->dma_area != NULL) {
 		/* perphaps, we might free the large DMA memory region
 		   to save some space here, but the actual solution
 		   costs us less time */
 		if (runtime->dma_bytes >= size)
 			return 0;	/* ok, do not change */
       		snd_pcm_lib_free_pages(substream);
 	}
 	if (substream->dma_area != NULL && substream->dma_bytes >= size) {
 		dma_area = substream->dma_area;
 		dma_addr = substream->dma_addr;
 	} else {
 		switch (substream->dma_type) {
 		case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
 			dma_area = snd_malloc_pages(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff));
 			dma_addr = 0UL;		/* not valid */
 			break;
 #ifdef CONFIG_ISA
 		case SNDRV_PCM_DMA_TYPE_ISA:
 			dma_area = snd_malloc_isa_pages(size, &dma_addr);
 			break;
 #endif
 #ifdef CONFIG_PCI
 		case SNDRV_PCM_DMA_TYPE_PCI:
 			dma_area = snd_malloc_pci_pages((struct pci_dev *)substream->dma_private, size, &dma_addr);
 			break;
 #endif
 		default:
 			return -ENXIO;
 		}
 	}
 	if (! dma_area)
 		return -ENOMEM;
 	runtime->dma_area = dma_area;
 	runtime->dma_addr = dma_addr;
 	runtime->dma_bytes = size;
 	return 1;			/* area was changed */
 }

 int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream)
 {
 	snd_pcm_runtime_t *runtime;

 	snd_assert(substream != NULL, return -EINVAL);
 	runtime = substream->runtime;
 	snd_assert(runtime != NULL, return -EINVAL);
 	if (runtime->dma_area == NULL)
 		return 0;
 	if (runtime->dma_area != substream->dma_area) {
 		switch (substream->dma_type) {
 #ifdef CONFIG_ISA
 		case SNDRV_PCM_DMA_TYPE_ISA:
 			snd_free_isa_pages(runtime->dma_bytes, runtime->dma_area, runtime->dma_addr);
 			break;
 #endif
 #ifdef CONFIG_PCI
 		case SNDRV_PCM_DMA_TYPE_PCI:
 			snd_free_pci_pages((struct pci_dev *)substream->dma_private, runtime->dma_bytes, runtime->dma_area, runtime->dma_addr);
 			break;
 #endif
 		}
 	}
 	runtime->dma_area = NULL;
 	runtime->dma_addr = 0UL;
 	runtime->dma_bytes = 0;
 	return 0;
 }

 #ifdef CONFIG_PCI

 int snd_pcm_lib_preallocate_pci_pages(struct pci_dev *pci,
 				      snd_pcm_substream_t *substream,
 				      size_t size, size_t max)
 {
 	substream->dma_type = SNDRV_PCM_DMA_TYPE_PCI;
 	substream->dma_private = pci;
 	return snd_pcm_lib_preallocate_pages1(substream, size, max);
 }

 int snd_pcm_lib_preallocate_pci_pages_for_all(struct pci_dev *pci,
 					      snd_pcm_t *pcm,
 					      size_t size, size_t max)
 {
 	snd_pcm_substream_t *substream;
 	int stream, err;

 	for (stream = 0; stream < 2; stream++)
 		for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
 			if ((err = snd_pcm_lib_preallocate_pci_pages(pci, substream, size, max)) < 0)
 				return err;
 	return 0;
 }

 #endif /* CONFIG_PCI */
	/*
	* Digital Audio (PCM) abstract layer
	* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
	*
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#define __NO_VERSION__
	#include <sound/driver.h>
	#include <asm/io.h>
	#include <linux/time.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/info.h>
	#include <sound/initval.h>

	static int snd_preallocate_dma = 1;
	MODULE_PARM(snd_preallocate_dma, "i");
	MODULE_PARM_DESC(snd_preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized.");
	MODULE_PARM_SYNTAX(snd_preallocate_dma, SNDRV_BOOLEAN_TRUE_DESC);

	static int snd_maximum_substreams = 4;
	MODULE_PARM(snd_maximum_substreams, "i");
	MODULE_PARM_DESC(snd_maximum_substreams, "Maximum substreams with preallocated DMA memory.");
	MODULE_PARM_SYNTAX(snd_maximum_substreams, SNDRV_BOOLEAN_TRUE_DESC);

	static int snd_minimum_buffer = 16384;


	static void snd_pcm_lib_preallocate_dma_free(snd_pcm_substream_t *substream)
	{
	if (substream->dma_area == NULL)
	return;
	switch (substream->dma_type) {
	case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
	snd_free_pages(substream->dma_area, substream->dma_bytes);
	break;
	#ifdef CONFIG_ISA
	case SNDRV_PCM_DMA_TYPE_ISA:
	snd_free_isa_pages(substream->dma_bytes, substream->dma_area, substream->dma_addr);
	break;
	#endif
	#ifdef CONFIG_PCI
	case SNDRV_PCM_DMA_TYPE_PCI:
	snd_free_pci_pages((struct pci_dev *)substream->dma_private, substream->dma_bytes, substream->dma_area, substream->dma_addr);
	break;
	#endif
	}
	substream->dma_area = NULL;
	}

	int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream)
	{
	snd_pcm_lib_preallocate_dma_free(substream);
	if (substream->proc_prealloc_entry) {
	snd_info_unregister(substream->proc_prealloc_entry);
	substream->proc_prealloc_entry = NULL;
	}
	return 0;
	}

	int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm)
	{
	snd_pcm_substream_t *substream;
	int stream;

	for (stream = 0; stream < 2; stream++)
	for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
	snd_pcm_lib_preallocate_free(substream);
	return 0;
	}

	static void snd_pcm_lib_preallocate_proc_read(snd_info_entry_t *entry,
	snd_info_buffer_t *buffer)
	{
	snd_pcm_substream_t substream = (snd_pcm_substream_t )entry->private_data;
	snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_bytes / 1024);
	}

	static void snd_pcm_lib_preallocate_proc_write(snd_info_entry_t *entry,
	snd_info_buffer_t *buffer)
	{
	snd_pcm_substream_t substream = (snd_pcm_substream_t )entry->private_data;
	char line[64], str[64];
	size_t size;
	void *dma_area;
	dma_addr_t dma_addr;

	if (substream->runtime) {
	buffer->error = -EBUSY;
	return;
	}
	if (!snd_info_get_line(buffer, line, sizeof(line))) {
	snd_info_get_str(str, line, sizeof(str));
	size = simple_strtoul(str, NULL, 10) * 1024;
	if ((size != 0 && size < 8192) \|\| size > substream->dma_max) {
	buffer->error = -EINVAL;
	return;
	}
	if (substream->dma_bytes == size)
	return;
	if (size > 0) {
	switch (substream->dma_type) {
	case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
	dma_area = snd_malloc_pages(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff));
	dma_addr = 0UL; /* not valid */
	break;
	#ifdef CONFIG_ISA
	case SNDRV_PCM_DMA_TYPE_ISA:
	dma_area = snd_malloc_isa_pages(size, &dma_addr);
	break;
	#endif
	#ifdef CONFIG_PCI
	case SNDRV_PCM_DMA_TYPE_PCI:
	dma_area = snd_malloc_pci_pages((struct pci_dev *)substream->dma_private, size, &dma_addr);
	break;
	#endif
	default:
	dma_area = NULL;
	dma_addr = 0UL;
	}
	if (dma_area == NULL) {
	buffer->error = -ENOMEM;
	return;
	}
	substream->buffer_bytes_max = size;
	} else {
	dma_area = NULL;
	substream->buffer_bytes_max = UINT_MAX;
	}
	snd_pcm_lib_preallocate_dma_free(substream);
	substream->dma_area = dma_area;
	substream->dma_addr = dma_addr;
	substream->dma_bytes = size;
	} else {
	buffer->error = -EINVAL;
	}
	}

	static int snd_pcm_lib_preallocate_pages1(snd_pcm_substream_t *substream,
	size_t size, size_t max)
	{
	unsigned long rsize = 0;
	void *dma_area = NULL;
	dma_addr_t dma_addr = 0UL;
	snd_info_entry_t *entry;

	if (!size \|\| !snd_preallocate_dma \|\| substream->number >= snd_maximum_substreams) {
	size = 0;
	} else {
	switch (substream->dma_type) {
	case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
	dma_area = snd_malloc_pages_fallback(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff), &rsize);
	dma_addr = 0UL; /* not valid */
	break;
	#ifdef CONFIG_ISA
	case SNDRV_PCM_DMA_TYPE_ISA:
	dma_area = snd_malloc_isa_pages_fallback(size, &dma_addr, &rsize);
	break;
	#endif
	#ifdef CONFIG_PCI
	case SNDRV_PCM_DMA_TYPE_PCI:
	dma_area = snd_malloc_pci_pages_fallback((struct pci_dev *)substream->dma_private, size, &dma_addr, &rsize);
	break;
	#endif
	default:
	size = 0;
	}
	if (rsize < snd_minimum_buffer) {
	snd_pcm_lib_preallocate_dma_free(substream);
	size = 0;
	}
	}
	substream->dma_area = dma_area;
	substream->dma_addr = dma_addr;
	substream->dma_bytes = rsize;
	if (rsize > 0)
	substream->buffer_bytes_max = rsize;
	substream->dma_max = max;
	if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
	entry->c.text.read_size = 64;
	entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
	entry->c.text.write_size = 64;
	entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
	entry->private_data = substream;
	if (snd_info_register(entry) < 0) {
	snd_info_free_entry(entry);
	entry = NULL;
	}
	}
	substream->proc_prealloc_entry = entry;
	return 0;
	}

	int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
	size_t size, size_t max,
	unsigned int flags)
	{
	substream->dma_type = SNDRV_PCM_DMA_TYPE_CONTINUOUS;
	substream->dma_private = (void *)(unsigned long)flags;
	return snd_pcm_lib_preallocate_pages1(substream, size, max);
	}

	int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
	size_t size, size_t max,
	unsigned int flags)
	{
	snd_pcm_substream_t *substream;
	int stream, err;

	for (stream = 0; stream < 2; stream++)
	for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
	if ((err = snd_pcm_lib_preallocate_pages(substream, size, max, flags)) < 0)
	return err;
	return 0;
	}

	#ifdef CONFIG_ISA
	int snd_pcm_lib_preallocate_isa_pages(snd_pcm_substream_t *substream,
	size_t size, size_t max)
	{
	substream->dma_type = SNDRV_PCM_DMA_TYPE_ISA;
	substream->dma_private = NULL;
	return snd_pcm_lib_preallocate_pages1(substream, size, max);
	}

	int snd_pcm_lib_preallocate_isa_pages_for_all(snd_pcm_t *pcm,
	size_t size, size_t max)
	{
	snd_pcm_substream_t *substream;
	int stream, err;

	for (stream = 0; stream < 2; stream++)
	for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
	if ((err = snd_pcm_lib_preallocate_isa_pages(substream, size, max)) < 0)
	return err;
	return 0;
	}
	#endif /* CONFIG_ISA */

	int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size)
	{
	snd_pcm_runtime_t *runtime;
	void *dma_area = NULL;
	dma_addr_t dma_addr = 0UL;

	snd_assert(substream != NULL, return -EINVAL);
	runtime = substream->runtime;
	snd_assert(runtime != NULL, return -EINVAL);
	if (runtime->dma_area != NULL) {
	/* perphaps, we might free the large DMA memory region
	to save some space here, but the actual solution
	costs us less time */
	if (runtime->dma_bytes >= size)
	return 0; /* ok, do not change */
	snd_pcm_lib_free_pages(substream);
	}
	if (substream->dma_area != NULL && substream->dma_bytes >= size) {
	dma_area = substream->dma_area;
	dma_addr = substream->dma_addr;
	} else {
	switch (substream->dma_type) {
	case SNDRV_PCM_DMA_TYPE_CONTINUOUS:
	dma_area = snd_malloc_pages(size, (unsigned int)((unsigned long)substream->dma_private & 0xffffffff));
	dma_addr = 0UL; /* not valid */
	break;
	#ifdef CONFIG_ISA
	case SNDRV_PCM_DMA_TYPE_ISA:
	dma_area = snd_malloc_isa_pages(size, &dma_addr);
	break;
	#endif
	#ifdef CONFIG_PCI
	case SNDRV_PCM_DMA_TYPE_PCI:
	dma_area = snd_malloc_pci_pages((struct pci_dev *)substream->dma_private, size, &dma_addr);
	break;
	#endif
	default:
	return -ENXIO;
	}
	}
	if (! dma_area)
	return -ENOMEM;
	runtime->dma_area = dma_area;
	runtime->dma_addr = dma_addr;
	runtime->dma_bytes = size;
	return 1; /* area was changed */
	}

	int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream)
	{
	snd_pcm_runtime_t *runtime;

	snd_assert(substream != NULL, return -EINVAL);
	runtime = substream->runtime;
	snd_assert(runtime != NULL, return -EINVAL);
	if (runtime->dma_area == NULL)
	return 0;
	if (runtime->dma_area != substream->dma_area) {
	switch (substream->dma_type) {
	#ifdef CONFIG_ISA
	case SNDRV_PCM_DMA_TYPE_ISA:
	snd_free_isa_pages(runtime->dma_bytes, runtime->dma_area, runtime->dma_addr);
	break;
	#endif
	#ifdef CONFIG_PCI
	case SNDRV_PCM_DMA_TYPE_PCI:
	snd_free_pci_pages((struct pci_dev *)substream->dma_private, runtime->dma_bytes, runtime->dma_area, runtime->dma_addr);
	break;
	#endif
	}
	}
	runtime->dma_area = NULL;
	runtime->dma_addr = 0UL;
	runtime->dma_bytes = 0;
	return 0;
	}

	#ifdef CONFIG_PCI

	int snd_pcm_lib_preallocate_pci_pages(struct pci_dev *pci,
	snd_pcm_substream_t *substream,
	size_t size, size_t max)
	{
	substream->dma_type = SNDRV_PCM_DMA_TYPE_PCI;
	substream->dma_private = pci;
	return snd_pcm_lib_preallocate_pages1(substream, size, max);
	}

	int snd_pcm_lib_preallocate_pci_pages_for_all(struct pci_dev *pci,
	snd_pcm_t *pcm,
	size_t size, size_t max)
	{
	snd_pcm_substream_t *substream;
	int stream, err;

	for (stream = 0; stream < 2; stream++)
	for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
	if ((err = snd_pcm_lib_preallocate_pci_pages(pci, substream, size, max)) < 0)
	return err;
	return 0;
	}

	#endif /* CONFIG_PCI */