If dma_alloc() is really used for streaming-dma between cache-incoherent
masters, it should return cache-line aligned buffers, so we don't risk
invalidating shared cache lines. Bump up the default alignment to 32-bytes.
This doesn't affect ARM, as it defines its own implementation with
64-byte buffers.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
include/dma.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/dma.h b/include/dma.h
index 1b1cb3a40796..90f9254ea80f 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -8,6 +8,7 @@
#include <malloc.h>
#include <xfuncs.h>
+#include <linux/kernel.h>
#include <dma-dir.h>
#include <asm/dma.h>
@@ -15,10 +16,14 @@
#define DMA_ADDRESS_BROKEN NULL
+#ifndef DMA_ALIGNMENT
+#define DMA_ALIGNMENT 32
+#endif
+
#ifndef dma_alloc
static inline void *dma_alloc(size_t size)
{
- return xmalloc(size);
+ return xmemalign(DMA_ALIGNMENT, ALIGN(size, DMA_ALIGNMENT));
}
#endif
--
2.29.2
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