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authorTakashi Iwai <tiwai@suse.de>2021-10-17 10:48:58 +0300
committerTakashi Iwai <tiwai@suse.de>2021-10-18 14:32:12 +0300
commit73325f60e2ed28f04032d43c2828b73776cfefd0 (patch)
treecd1f8757a850644c6d876e130c724131033d429d /sound/core
parenta25684a956468ee8bbbee44649e41e5d447e5adc (diff)
downloadlinux-73325f60e2ed28f04032d43c2828b73776cfefd0.tar.xz
ALSA: memalloc: Support for non-coherent page allocation
Following to 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. Link: https://lore.kernel.org/r/20211017074859.24112-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/memalloc.c47
1 files changed, 47 insertions, 0 deletions
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 */