In order to have the ability to declare a non exclusive shared-dma-pool,
i.e. without the DMA_MEMORY_EXCLUSIVE flag, add the 'no-exclusive' DT
optional parameter to initialize the coherent memory without the flag.
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/base/dma-coherent.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 55b8398..cda6364 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -279,10 +279,14 @@ EXPORT_SYMBOL(dma_mmap_from_coherent);
static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
{
struct dma_coherent_mem *mem = rmem->priv;
+ unsigned flags = 0;
+
+ if (!of_property_read_bool(rmem->fdt_node, "no-exclusive"))
+ flags |= DMA_MEMORY_EXCLUSIVE;
if (!mem &&
dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
- DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
+ DMA_MEMORY_MAP | flags,
&mem) != DMA_MEMORY_MAP) {
pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
&rmem->base, (unsigned long)rmem->size / SZ_1M);
--
1.9.1
--
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