From: Catalin Marinas Date: Tue, 1 Apr 2014 17:32:55 +0000 (+0100) Subject: arm64: Fix DMA range invalidation for cache line unaligned buffers X-Git-Tag: firefly_0821_release~176^2~4103^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ebf81a938dade3b450eb11c57fa744cfac4b523f;p=firefly-linux-kernel-4.4.55.git arm64: Fix DMA range invalidation for cache line unaligned buffers If the buffer needing cache invalidation for inbound DMA does start or end on a cache line aligned address, we need to use the non-destructive clean&invalidate operation. This issue was introduced by commit 7363590d2c46 (arm64: Implement coherent DMA API based on swiotlb). Signed-off-by: Catalin Marinas Reported-by: Jon Medhurst (Tixy) --- diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S index e803a62e0e45..fda756875fa6 100644 --- a/arch/arm64/mm/cache.S +++ b/arch/arm64/mm/cache.S @@ -183,12 +183,19 @@ ENTRY(__inval_cache_range) __dma_inv_range: dcache_line_size x2, x3 sub x3, x2, #1 - bic x0, x0, x3 + tst x1, x3 // end cache line aligned? bic x1, x1, x3 -1: dc ivac, x0 // invalidate D / U line - add x0, x0, x2 + b.eq 1f + dc civac, x1 // clean & invalidate D / U line +1: tst x0, x3 // start cache line aligned? + bic x0, x0, x3 + b.eq 2f + dc civac, x0 // clean & invalidate D / U line + b 3f +2: dc ivac, x0 // invalidate D / U line +3: add x0, x0, x2 cmp x0, x1 - b.lo 1b + b.lo 2b dsb sy ret ENDPROC(__inval_cache_range)