From cc6a8acdeee932f6911d8b236d2c7d6bcc4616f6 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 17 Jun 2008 16:39:06 +0200 Subject: ALSA: Fix SG-buffer DMA with non-coherent architectures Using SG-buffers with dma_alloc_coherent() is often very inefficient on non-coherent architectures because a tracking record could be allocated in addition for each dma_alloc_coherent() call. Instead, simply disable SG-buffers but just allocate normal continuous buffers on non-supported (currently all but x86) architectures. Signed-off-by: Takashi Iwai --- sound/core/Kconfig | 4 ++++ sound/core/Makefile | 2 +- sound/core/memalloc.c | 4 ++++ sound/core/pcm_memory.c | 2 ++ 4 files changed, 11 insertions(+), 1 deletion(-) (limited to 'sound/core') diff --git a/sound/core/Kconfig b/sound/core/Kconfig index 6061fb5f4e1c..c15682a2f9db 100644 --- a/sound/core/Kconfig +++ b/sound/core/Kconfig @@ -206,4 +206,8 @@ config SND_PCM_XRUN_DEBUG config SND_VMASTER bool +config SND_DMA_SGBUF + def_bool y + depends on X86 + source "sound/core/seq/Kconfig" diff --git a/sound/core/Makefile b/sound/core/Makefile index 4229052e7b91..350a08d277f4 100644 --- a/sound/core/Makefile +++ b/sound/core/Makefile @@ -13,7 +13,7 @@ snd-pcm-objs := pcm.o pcm_native.o pcm_lib.o pcm_timer.o pcm_misc.o \ pcm_memory.o snd-page-alloc-y := memalloc.o -snd-page-alloc-$(CONFIG_HAS_DMA) += sgbuf.o +snd-page-alloc-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o snd-rawmidi-objs := rawmidi.o snd-timer-objs := timer.o diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index 1b3534d67686..9e92441f9b78 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -199,6 +199,8 @@ int snd_dma_alloc_pages(int type, struct device *device, size_t size, case SNDRV_DMA_TYPE_DEV: dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr); break; +#endif +#ifdef CONFIG_SND_DMA_SGBUF case SNDRV_DMA_TYPE_DEV_SG: snd_malloc_sgbuf_pages(device, size, dmab, NULL); break; @@ -269,6 +271,8 @@ void snd_dma_free_pages(struct snd_dma_buffer *dmab) case SNDRV_DMA_TYPE_DEV: snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); break; +#endif +#ifdef CONFIG_SND_DMA_SGBUF case SNDRV_DMA_TYPE_DEV_SG: snd_free_sgbuf_pages(dmab); break; diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index a6d42808828c..caa7796bc2f5 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -304,6 +304,7 @@ int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); +#ifdef CONFIG_SND_DMA_SGBUF /** * snd_pcm_sgbuf_ops_page - get the page struct at the given offset * @substream: the pcm substream instance @@ -349,6 +350,7 @@ unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, return size; } EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size); +#endif /* CONFIG_SND_DMA_SGBUF */ /** * snd_pcm_lib_malloc_pages - allocate the DMA buffer -- cgit v1.2.3