[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / sgbuf.c

/*
 * Scatter-Gather buffer
 *
 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *   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
 *
 */

#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <sound/memalloc.h>


/* table entries are align to 32 */
#define SGBUF_TBL_ALIGN		32
#define sgbuf_align_table(tbl)	ALIGN((tbl), SGBUF_TBL_ALIGN)

int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab)
{
	struct snd_sg_buf *sgbuf = dmab->private_data;
	struct snd_dma_buffer tmpb;
	int i;

	if (! sgbuf)
		return -EINVAL;

	if (dmab->area)
		vunmap(dmab->area);
	dmab->area = NULL;

	tmpb.dev.type = SNDRV_DMA_TYPE_DEV;
	tmpb.dev.dev = sgbuf->dev;
	for (i = 0; i < sgbuf->pages; i++) {
		if (!(sgbuf->table[i].addr & ~PAGE_MASK))
			continue; /* continuous pages */
		tmpb.area = sgbuf->table[i].buf;
		tmpb.addr = sgbuf->table[i].addr & PAGE_MASK;
		tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT;
		snd_dma_free_pages(&tmpb);
	}

	kfree(sgbuf->table);
	kfree(sgbuf->page_table);
	kfree(sgbuf);
	dmab->private_data = NULL;
	
	return 0;
}

#define MAX_ALLOC_PAGES		32

void *snd_malloc_sgbuf_pages(struct device *device,
			     size_t size, struct snd_dma_buffer *dmab,
			     size_t *res_size)
{
	struct snd_sg_buf *sgbuf;
	unsigned int i, pages, chunk, maxpages;
	struct snd_dma_buffer tmpb;
	struct snd_sg_page *table;
	struct page **pgtable;

	dmab->area = NULL;
	dmab->addr = 0;
	dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
	if (! sgbuf)
		return NULL;
	sgbuf->dev = device;
	pages = snd_sgbuf_aligned_pages(size);
	sgbuf->tblsize = sgbuf_align_table(pages);
	table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL);
	if (!table)
		goto _failed;
	sgbuf->table = table;
	pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL);
	if (!pgtable)
		goto _failed;
	sgbuf->page_table = pgtable;

	/* allocate pages */
	maxpages = MAX_ALLOC_PAGES;
	while (pages > 0) {
		chunk = pages;
		/* don't be too eager to take a huge chunk */
		if (chunk > maxpages)
			chunk = maxpages;
		chunk <<= PAGE_SHIFT;
		if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, device,
						 chunk, &tmpb) < 0) {
			if (!sgbuf->pages)
				goto _failed;
			if (!res_size)
				goto _failed;
			size = sgbuf->pages * PAGE_SIZE;
			break;
		}
		chunk = tmpb.bytes >> PAGE_SHIFT;
		for (i = 0; i < chunk; i++) {
			table->buf = tmpb.area;
			table->addr = tmpb.addr;
			if (!i)
				table->addr |= chunk; /* mark head */
			table++;
			*pgtable++ = virt_to_page(tmpb.area);
			tmpb.area += PAGE_SIZE;
			tmpb.addr += PAGE_SIZE;
		}
		sgbuf->pages += chunk;
		pages -= chunk;
		if (chunk < maxpages)
			maxpages = chunk;
	}

	sgbuf->size = size;
	dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, PAGE_KERNEL);
	if (! dmab->area)
		goto _failed;
	if (res_size)
		*res_size = sgbuf->size;
	return dmab->area;

 _failed:
	snd_free_sgbuf_pages(dmab); /* free the table */
	return NULL;
}

/*
 * compute the max chunk size with continuous pages on sg-buffer
 */
unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
				      unsigned int ofs, unsigned int size)
{
	struct snd_sg_buf *sg = dmab->private_data;
	unsigned int start, end, pg;

	start = ofs >> PAGE_SHIFT;
	end = (ofs + size - 1) >> PAGE_SHIFT;
	/* check page continuity */
	pg = sg->table[start].addr >> PAGE_SHIFT;
	for (;;) {
		start++;
		if (start > end)
			break;
		pg++;
		if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
			return (start << PAGE_SHIFT) - ofs;
	}
	/* ok, all on continuous pages */
	return size;
}
EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Scatter-Gather buffer
	3	*
	4	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	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	*
	20	*/
	21
1da177e4 LT	22	#include <linux/slab.h>
	23	#include <linux/mm.h>
	24	#include <linux/vmalloc.h>
9d069dc0	25	#include <linux/export.h>
1da177e4 LT	26	#include <sound/memalloc.h>
	27
	28
	29	/* table entries are align to 32 */
	30	#define SGBUF_TBL_ALIGN 32
7ab39926	31	#define sgbuf_align_table(tbl) ALIGN((tbl), SGBUF_TBL_ALIGN)
1da177e4 LT	32
	33	int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab)
	34	{
	35	struct snd_sg_buf *sgbuf = dmab->private_data;
	36	struct snd_dma_buffer tmpb;
	37	int i;
	38
	39	if (! sgbuf)
	40	return -EINVAL;
	41
6af845e4 TI	42	if (dmab->area)
	43	vunmap(dmab->area);
	44	dmab->area = NULL;
	45
1da177e4 LT	46	tmpb.dev.type = SNDRV_DMA_TYPE_DEV;
	47	tmpb.dev.dev = sgbuf->dev;
	48	for (i = 0; i < sgbuf->pages; i++) {
51e9f2e6 TI	49	if (!(sgbuf->table[i].addr & ~PAGE_MASK))
51e9f2e6 TI	50	continue; /* continuous pages */
1da177e4	51	tmpb.area = sgbuf->table[i].buf;
51e9f2e6 TI	52	tmpb.addr = sgbuf->table[i].addr & PAGE_MASK;
51e9f2e6 TI	53	tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT;
1da177e4 LT	54	snd_dma_free_pages(&tmpb);
1da177e4 LT	55	}
1da177e4 LT	56
	57	kfree(sgbuf->table);
	58	kfree(sgbuf->page_table);
	59	kfree(sgbuf);
	60	dmab->private_data = NULL;
	61
	62	return 0;
	63	}
	64
51e9f2e6 TI	65	#define MAX_ALLOC_PAGES 32
51e9f2e6 TI	66
1da177e4 LT	67	void snd_malloc_sgbuf_pages(struct device device,
	68	size_t size, struct snd_dma_buffer *dmab,
	69	size_t *res_size)
	70	{
	71	struct snd_sg_buf *sgbuf;
51e9f2e6	72	unsigned int i, pages, chunk, maxpages;
1da177e4	73	struct snd_dma_buffer tmpb;
51e9f2e6 TI	74	struct snd_sg_page *table;
51e9f2e6 TI	75	struct page **pgtable;
1da177e4 LT	76
	77	dmab->area = NULL;
	78	dmab->addr = 0;
59feddb2	79	dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
1da177e4 LT	80	if (! sgbuf)
1da177e4 LT	81	return NULL;
1da177e4 LT	82	sgbuf->dev = device;
	83	pages = snd_sgbuf_aligned_pages(size);
	84	sgbuf->tblsize = sgbuf_align_table(pages);
51e9f2e6 TI	85	table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL);
51e9f2e6 TI	86	if (!table)
1da177e4	87	goto _failed;
51e9f2e6 TI	88	sgbuf->table = table;
	89	pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL);
	90	if (!pgtable)
1da177e4	91	goto _failed;
51e9f2e6	92	sgbuf->page_table = pgtable;
1da177e4	93
51e9f2e6 TI	94	/* allocate pages */
	95	maxpages = MAX_ALLOC_PAGES;
	96	while (pages > 0) {
	97	chunk = pages;
	98	/* don't be too eager to take a huge chunk */
	99	if (chunk > maxpages)
	100	chunk = maxpages;
	101	chunk <<= PAGE_SHIFT;
	102	if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, device,
	103	chunk, &tmpb) < 0) {
	104	if (!sgbuf->pages)
c810f903	105	goto _failed;
51e9f2e6	106	if (!res_size)
1da177e4	107	goto _failed;
51e9f2e6	108	size = sgbuf->pages * PAGE_SIZE;
1da177e4 LT	109	break;
1da177e4 LT	110	}
51e9f2e6 TI	111	chunk = tmpb.bytes >> PAGE_SHIFT;
	112	for (i = 0; i < chunk; i++) {
	113	table->buf = tmpb.area;
	114	table->addr = tmpb.addr;
	115	if (!i)
	116	table->addr \|= chunk; /* mark head */
	117	table++;
	118	*pgtable++ = virt_to_page(tmpb.area);
	119	tmpb.area += PAGE_SIZE;
	120	tmpb.addr += PAGE_SIZE;
	121	}
	122	sgbuf->pages += chunk;
	123	pages -= chunk;
	124	if (chunk < maxpages)
	125	maxpages = chunk;
1da177e4 LT	126	}
	127
	128	sgbuf->size = size;
	129	dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, PAGE_KERNEL);
	130	if (! dmab->area)
	131	goto _failed;
51e9f2e6 TI	132	if (res_size)
51e9f2e6 TI	133	*res_size = sgbuf->size;
1da177e4 LT	134	return dmab->area;
	135
	136	_failed:
	137	snd_free_sgbuf_pages(dmab); /* free the table */
	138	return NULL;
	139	}
9d069dc0 TI	140
	141	/*
	142	* compute the max chunk size with continuous pages on sg-buffer
	143	*/
	144	unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
	145	unsigned int ofs, unsigned int size)
	146	{
	147	struct snd_sg_buf *sg = dmab->private_data;
	148	unsigned int start, end, pg;
	149
	150	start = ofs >> PAGE_SHIFT;
	151	end = (ofs + size - 1) >> PAGE_SHIFT;
	152	/* check page continuity */
	153	pg = sg->table[start].addr >> PAGE_SHIFT;
	154	for (;;) {
	155	start++;
	156	if (start > end)
	157	break;
	158	pg++;
	159	if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
	160	return (start << PAGE_SHIFT) - ofs;
	161	}
	162	/* ok, all on continuous pages */
	163	return size;
	164	}
	165	EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);