[RFC PATCH v3 1/2] base: dma-coherent: Add DT property for non exclusive shared-dma-pool
From: Neil Armstrong <hidden>
Date: 2015-11-10 16:18:43
Also in:
lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
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 <redacted> --- 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