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ALSA: Make snd_sgbuf_get_{ptr|addr}() available for non-SG cases

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Passing struct snd_dma_buffer pointer instead, so that they work no
matter whether real SG buffer is used or not.

This is a preliminary work for the HD-audio DSP loader code.

Signed-off-by: Ian Minett <ian_minett@creativelabs.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2012-09-20 20:29:12 -07:00
parent 3d98c21d06
commit 9d069dc00b
4 changed files with 66 additions and 53 deletions
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26
sound/core/pcm_memory.c
View File

@@ -327,32 +327,6 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne
}
EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
/*
* compute the max chunk size with continuous pages on sg-buffer
*/
unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
unsigned int ofs, unsigned int size)
{
struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
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_pcm_sgbuf_get_chunk_size);
#endif /* CONFIG_SND_DMA_SGBUF */
/**

27
sound/core/sgbuf.c
View File

@@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <sound/memalloc.h>
@@ -136,3 +137,29 @@ void *snd_malloc_sgbuf_pages(struct device *device,
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);