Following after the addition of non-contiguous pages, this patch adds the new contiguous non-coherent page allocation to the standard memalloc helper. Like the previous non-contig type, this non-coherent type is also directional and requires the explicit sync, too. Hence the driver using this type of buffer may need to set SNDRV_PCM_INFO_EXPLICIT_SYNC flag to the PCM hardware.info as well, unless it's set up in the managed mode.
Signed-off-by: Takashi Iwai tiwai@suse.de --- include/sound/memalloc.h | 1 + sound/core/memalloc.c | 47 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+)
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h index 1457eba1ac53..0bdaa6753282 100644 --- a/include/sound/memalloc.h +++ b/include/sound/memalloc.h @@ -50,6 +50,7 @@ struct snd_dma_device { #endif #define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */ #define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */ +#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
/* * info for buffer allocation diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index 11f9a68bf94c..99681e651223 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -560,6 +560,52 @@ static const struct snd_malloc_ops snd_dma_noncontig_ops = { .get_chunk_size = snd_dma_vmalloc_get_chunk_size, };
+/* + * Non-coherent pages allocator + */ +static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size) +{ + dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->dev.dir); + return dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr, + dmab->dev.dir, DEFAULT_GFP); +} + +static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab) +{ + dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area, + dmab->addr, dmab->dev.dir); +} + +static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + area->vm_page_prot = vm_get_page_prot(area->vm_flags); + return dma_mmap_pages(dmab->dev.dev, area, + area->vm_end - area->vm_start, + virt_to_page(dmab->area)); +} + +static void snd_dma_noncoherent_sync(struct snd_dma_buffer *dmab, + enum snd_dma_sync_mode mode) +{ + if (mode == SNDRV_DMA_SYNC_CPU) { + if (dmab->dev.dir != DMA_TO_DEVICE) + dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr, + dmab->bytes, dmab->dev.dir); + } else { + if (dmab->dev.dir != DMA_FROM_DEVICE) + dma_sync_single_for_device(dmab->dev.dev, dmab->addr, + dmab->bytes, dmab->dev.dir); + } +} + +static const struct snd_malloc_ops snd_dma_noncoherent_ops = { + .alloc = snd_dma_noncoherent_alloc, + .free = snd_dma_noncoherent_free, + .mmap = snd_dma_noncoherent_mmap, + .sync = snd_dma_noncoherent_sync, +}; + #endif /* CONFIG_HAS_DMA */
/* @@ -572,6 +618,7 @@ static const struct snd_malloc_ops *dma_ops[] = { [SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops, [SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops, [SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops, + [SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops, #ifdef CONFIG_GENERIC_ALLOCATOR [SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops, #endif /* CONFIG_GENERIC_ALLOCATOR */