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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2021-06-19 06:50:45 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2021-06-24 08:53:47 +0200 |
| commit | d5536e6006baa40076dfd27ffce49d5bc54736b0 (patch) | |
| tree | 84892a318b2d464ed866643ece18f9569bbea381 /include/dma.h | |
| parent | 3a62463a4954a26ac3ec92550308ed3cbc3b3e05 (diff) | |
| download | barebox-d5536e6006baa40076dfd27ffce49d5bc54736b0.tar.gz | |
dma: allocate 32-byte aligned buffers by default
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@pengutronix.de>
Link: https://lore.barebox.org/20210619045055.779-20-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/dma.h')
| -rw-r--r-- | include/dma.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/dma.h b/include/dma.h index 1b1cb3a407..90f9254ea8 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 |