base: dma-coherent: Add DT property for non exclusive shared-dma-pool

RFC PATCH In review Neil Armstrong 1 participant 1 message Nov 10, 2015 Driver core

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Neil Armstrong

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2015-11-10 16:18 UTC #0 lore raw

RFC PATCH v3 1/2 base: dma-coherent: Add DT property for non exclusive shared-dma-pool

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 <[email protected]>

---
 drivers/base/dma-coherent.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

drivers/base/dma-coherent.c +5 -1

index 55b8398..b57478f 100644
@@ -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_get_flat_dt_prop(rmem->fdt_node, "no-exclusive", NULL))
+		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);

Signature · 1 line

1.9.1