ALSA: core: Abstract memory alloc helpers

This patch introduces the ops table to each memory allocation type
(SNDRV_DMA_TYPE_XXX) and abstract the handling for the better code
management.  Then we get separate the page allocation, release and
other tasks for each type, especially for the SG buffer.

Each buffer type has now callbacks in the struct snd_malloc_ops, and
the common helper functions call those ops accordingly.  The former
inline code that is specific to SG-buffer is moved into the local
sgbuf.c, and we can simplify the PCM code without details of memory
handling.

Link: https://lore.kernel.org/r/20210609162551.7842-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 21 deletions

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 542a75babdee..d7621ed105bd 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -337,27 +337,6 @@ void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
 }
 EXPORT_SYMBOL(snd_pcm_set_managed_buffer_all);
 
-#ifdef CONFIG_SND_DMA_SGBUF
-/*
- * snd_pcm_sgbuf_ops_page - get the page struct at the given offset
- * @substream: the pcm substream instance
- * @offset: the buffer offset
- *
- * Used as the page callback of PCM ops.
- *
- * Return: The page struct at the given buffer offset. %NULL on failure.
- */
-struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset)
-{
-	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
-
-	unsigned int idx = offset >> PAGE_SHIFT;
-	if (idx >= (unsigned int)sgbuf->pages)
-		return NULL;
-	return sgbuf->page_table[idx];
-}
-#endif /* CONFIG_SND_DMA_SGBUF */
-
 /**
  * snd_pcm_lib_malloc_pages - allocate the DMA buffer
  * @substream: the substream to allocate the DMA buffer to