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, 1 insertions, 19 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index eb468573f070..48d63dbb17ba 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3644,24 +3644,6 @@ static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file
 }
 #endif /* coherent mmap */
 
-static inline struct page *
-snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
-{
-	void *vaddr = substream->runtime->dma_area + ofs;
-
-	switch (substream->dma_buffer.dev.type) {
-#ifdef CONFIG_SND_DMA_SGBUF
-	case SNDRV_DMA_TYPE_DEV_SG:
-	case SNDRV_DMA_TYPE_DEV_UC_SG:
-		return snd_pcm_sgbuf_ops_page(substream, ofs);
-#endif /* CONFIG_SND_DMA_SGBUF */
-	case SNDRV_DMA_TYPE_VMALLOC:
-		return vmalloc_to_page(vaddr);
-	default:
-		return virt_to_page(vaddr);
-	}
-}
-
 /*
  * fault callback for mmapping a RAM page
  */
@@ -3683,7 +3665,7 @@ static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
 	if (substream->ops->page)
 		page = substream->ops->page(substream, offset);
 	else
-		page = snd_pcm_default_page_ops(substream, offset);
+		page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
 	if (!page)
 		return VM_FAULT_SIGBUS;
 	get_page(page);