On 05/19/2011 07:36 PM, Benjamin Herrenschmidt wrote:
On Wed, 2011-05-18 at 16:24 -0500, Eric Van Hensbergen wrote:
For BGP, it is convenient for 'kmalloc' to come back with 32-byte
aligned units for torus DMA
Signed-off-by: Eric Van Hensbergen<eri...@gmail.com>
---
arch/powerpc/include/asm/page_32.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/include/asm/page_32.h
b/arch/powerpc/include/asm/page_32.h
index 68d73b2..fb0a7ae 100644
--- a/arch/powerpc/include/asm/page_32.h
+++ b/arch/powerpc/include/asm/page_32.h
@@ -9,7 +9,7 @@
#define VM_DATA_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS32
-#ifdef CONFIG_NOT_COHERENT_CACHE
+#if defined(CONFIG_NOT_COHERENT_CACHE) || defined(CONFIG_BGP)
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif
Is DMA cache coherent on BG/P ? That's odd for a 4xx base :-)
Actually DMA sends invalidate requests to the snoop unit(L2 level).
BGP SoC is a bit different from other 4xx base.
Some details can be found in
www.scc.acad.bg/documentation/team.pdf
- kaz
Cheers,
Ben.
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