[PATCH 1/2] base: dma-coherent: Add DT property for non exclusive shared-dma-pool
From: Neil Armstrong <hidden>
Date: 2015-10-12 07:33:16
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. Leave exclusive memory as default. Signed-off-by: Neil Armstrong <redacted> --- drivers/base/dma-coherent.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 55b8398..e32d3cc 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c@@ -276,13 +276,14 @@ EXPORT_SYMBOL(dma_mmap_from_coherent); #include <linux/of_fdt.h> #include <linux/of_reserved_mem.h> -static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) +static int rmem_dma_device_flags_init(struct reserved_mem *rmem, + struct device *dev, int flags) { struct dma_coherent_mem *mem = rmem->priv; 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);
@@ -293,6 +294,17 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) return 0; } +static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) +{ + return rmem_dma_device_flags_init(rmem, dev, 0); +} + +static int rmem_dma_device_exclusive_init(struct reserved_mem *rmem, + struct device *dev) +{ + return rmem_dma_device_flags_init(rmem, dev, DMA_MEMORY_EXCLUSIVE); +} + static void rmem_dma_device_release(struct reserved_mem *rmem, struct device *dev) {
@@ -304,6 +316,11 @@ static const struct reserved_mem_ops rmem_dma_ops = { .device_release = rmem_dma_device_release, }; +static const struct reserved_mem_ops rmem_dma_exclusive_ops = { + .device_init = rmem_dma_device_exclusive_init, + .device_release = rmem_dma_device_release, +}; + static int __init rmem_dma_setup(struct reserved_mem *rmem) { unsigned long node = rmem->fdt_node;
@@ -318,7 +335,10 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem) } #endif - rmem->ops = &rmem_dma_ops; + if (of_get_flat_dt_prop(node, "no-exclusive", NULL)) + rmem->ops = &rmem_dma_ops; + else + rmem->ops = &rmem_dma_exclusive_ops; pr_info("Reserved memory: created DMA memory pool at %pa, size %ld MiB\n", &rmem->base, (unsigned long)rmem->size / SZ_1M); return 0;
--
1.9.1