diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-10-31 16:52:16 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-15 15:22:25 +0000 |
| commit | 2ffe2da3e71652d4f4cae19539b5c78c2a239136 (patch) | |
| tree | 1b69404360a47369c858e54643bab6836015ddbd /arch/arm/mm/cache-v7.S | |
| parent | 702b94bff3c50542a6e4ab9a4f4cef093262fe65 (diff) | |
ARM: dma-mapping: fix for speculative prefetching
ARMv6 and ARMv7 CPUs can perform speculative prefetching, which makes
DMA cache coherency handling slightly more interesting. Rather than
being able to rely upon the CPU not accessing the DMA buffer until DMA
has completed, we now must expect that the cache could be loaded with
possibly stale data from the DMA buffer.
Where DMA involves data being transferred to the device, we clean the
cache before handing it over for DMA, otherwise we invalidate the buffer
to get rid of potential writebacks. On DMA Completion, if data was
transferred from the device, we invalidate the buffer to get rid of
any stale speculative prefetches.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-By: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm/mm/cache-v7.S')
| -rw-r--r-- | arch/arm/mm/cache-v7.S | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S index b1cd0fd91207..bcd64f265870 100644 --- a/arch/arm/mm/cache-v7.S +++ b/arch/arm/mm/cache-v7.S @@ -279,10 +279,9 @@ ENDPROC(v7_dma_flush_range) */ ENTRY(v7_dma_map_area) add r1, r1, r0 - cmp r2, #DMA_TO_DEVICE - beq v7_dma_clean_range - bcs v7_dma_inv_range - b v7_dma_flush_range + teq r2, #DMA_FROM_DEVICE + beq v7_dma_inv_range + b v7_dma_clean_range ENDPROC(v7_dma_map_area) /* @@ -292,6 +291,9 @@ ENDPROC(v7_dma_map_area) * - dir - DMA direction */ ENTRY(v7_dma_unmap_area) + add r1, r1, r0 + teq r2, #DMA_TO_DEVICE + bne v7_dma_inv_range mov pc, lr ENDPROC(v7_dma_unmap_area) |