Although there are known problems caused by this, it seems prudent to
invalidate the region of memory we are about remap as
uncached. Additionaliy this matches how dma_alloc_coherent() is
implemented on ARM.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
arch/arm/cpu/mmu_64.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c
index a7186eda4..1ee6a3b8c 100644
--- a/arch/arm/cpu/mmu_64.c
+++ b/arch/arm/cpu/mmu_64.c
@@ -248,6 +248,14 @@ void mmu_disable(void)
isb();
}
+static void dma_inv_range(void *ptr, size_t size)
+{
+ unsigned long start = (unsigned long)ptr;
+ unsigned long end = start + size - 1;
+
+ v8_inv_dcache_range(start, end);
+}
+
void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle)
{
void *ret;
@@ -257,6 +265,8 @@ void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle)
if (dma_handle)
*dma_handle = (dma_addr_t)ret;
+ dma_inv_range(ret, size);
+
arch_remap_range(ret, size, MAP_UNCACHED);
return ret;
--
2.20.1
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