Messages in this thread Patch in this message | | | From | Neil Armstrong <> | Subject | [RFC PATCH v3 1/2] base: dma-coherent: Add DT property for non exclusive shared-dma-pool | Date | Tue, 10 Nov 2015 17:18:30 +0100 |
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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@baylibre.com> --- 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..b57478f 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_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); -- 1.9.1
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