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authorTakashi Iwai <tiwai@suse.de>2018-08-08 17:01:00 +0200
committerTakashi Iwai <tiwai@suse.de>2018-08-28 13:56:47 +0200
commit42e748a0b3251cca0de2c269ca106884907eb289 (patch)
treec9ef6999ece2e29f2c6ba4cf73666377c5b943aa /include/sound/memalloc.h
parent28f3f4f685d7d7226ba4ed4f78e04c75dd3a5b27 (diff)
downloadlinux-42e748a0b3251cca0de2c269ca106884907eb289.tar.gz
ALSA: memalloc: Add non-cached buffer type
In some cases (mainly for x86), we need the DMA coherent buffer with non-cached pages. Although this has been done in each driver side like HD-audio and intel8x0, it can be done cleaner in the core memory allocator. This patch adds the new types, SNDRV_DMA_TYPE_DEV_UC and SNDRV_DMA_TYPE_DEV_UC_SG, for allocating such non-cached buffer pages. On non-x86 architectures, they work as same as the standard SNDRV_DMA_TYPE_DEV and *_SG. One additional change by this move is that we can assure to pass the non-cached pgprot to the vmapped buffer, too. It eventually fixes the case like non-snoop mode without mmap access on HD-audio. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/memalloc.h')
-rw-r--r--include/sound/memalloc.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index 67561b997915..af3fa577fa06 100644
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -47,10 +47,13 @@ struct snd_dma_device {
#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
+#define SNDRV_DMA_TYPE_DEV_UC 5 /* continuous non-cahced */
#ifdef CONFIG_SND_DMA_SGBUF
#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
+#define SNDRV_DMA_TYPE_DEV_UC_SG 6 /* SG non-cached */
#else
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
+#define SNDRV_DMA_TYPE_DEV_UC_SG SNDRV_DMA_TYPE_DEV_UC
#endif
#ifdef CONFIG_GENERIC_ALLOCATOR
#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */