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ALSA: memalloc: Support for non-coherent page allocation

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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>
This commit is contained in:
Takashi Iwai
2021-10-17 09:48:58 +02:00
parent a25684a956
commit 73325f60e2
2 changed files with 48 additions and 0 deletions
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1
include/sound/memalloc.h
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@@ -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