diff options
| -rw-r--r-- | Documentation/userspace-api/dma-buf-heaps.rst | 9 | ||||
| -rw-r--r-- | drivers/dma-buf/heaps/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/dma-buf/heaps/cma_heap.c | 33 |
3 files changed, 22 insertions, 30 deletions
diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst index 5d68cab9ef13..05445c83b79a 100644 --- a/Documentation/userspace-api/dma-buf-heaps.rst +++ b/Documentation/userspace-api/dma-buf-heaps.rst @@ -24,9 +24,12 @@ following heaps: ``CMA_SIZE_MBYTES`` or ``CMA_SIZE_PERCENTAGE`` Kconfig options. Prior to Linux 6.17, its name wasn't stable and could be called ``reserved``, ``linux,cma``, or ``default-pool``, depending on the - platform. From Linux 6.17 onwards, the creation of these heaps is - controlled through the ``DMABUF_HEAPS_CMA_LEGACY`` Kconfig option for - backwards compatibility. + platform. + + - A heap will be created for each reusable region in the device tree + with the ``shared-dma-pool`` compatible, using the full device tree + node name as its name. The buffer semantics are identical to + ``default-cma-region``. Naming Convention ================= diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index bb369b38b001..a5eef06c4226 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -12,13 +12,3 @@ config DMABUF_HEAPS_CMA Choose this option to enable dma-buf CMA heap. This heap is backed by the Contiguous Memory Allocator (CMA). If your system has these regions, you should say Y here. - -config DMABUF_HEAPS_CMA_LEGACY - bool "Legacy DMA-BUF CMA Heap" - default y - depends on DMABUF_HEAPS_CMA - help - Add a duplicate CMA-backed dma-buf heap with legacy naming derived - from the CMA area's devicetree node, or "reserved" if the area is not - defined in the devicetree. This uses the same underlying allocator as - CONFIG_DMABUF_HEAPS_CMA. diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index 2a901af635ed..42f88193eab9 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -22,6 +22,8 @@ #include <linux/io.h> #include <linux/mm.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_reserved_mem.h> #include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/vmalloc.h> @@ -409,33 +411,30 @@ static int __init __add_cma_heap(struct cma *cma, const char *name) return 0; } -static int __init add_default_cma_heap(void) +static int __init add_cma_heaps(void) { struct cma *default_cma = dev_get_cma_area(NULL); - const char *legacy_cma_name; + unsigned int i; int ret; - if (!default_cma) - return 0; + if (default_cma) { + ret = __add_cma_heap(default_cma, DEFAULT_CMA_NAME); + if (ret) + return ret; + } - ret = __add_cma_heap(default_cma, DEFAULT_CMA_NAME); - if (ret) - return ret; + for (i = 0; i < dma_areas_num; i++) { + struct cma *cma = dma_areas[i]; - if (IS_ENABLED(CONFIG_DMABUF_HEAPS_CMA_LEGACY)) { - legacy_cma_name = cma_get_name(default_cma); - if (!strcmp(legacy_cma_name, DEFAULT_CMA_NAME)) { - pr_warn("legacy name and default name are the same, skipping legacy heap\n"); - return 0; + ret = __add_cma_heap(cma, cma_get_name(cma)); + if (ret) { + pr_warn("Failed to add CMA heap %s", cma_get_name(cma)); + continue; } - ret = __add_cma_heap(default_cma, legacy_cma_name); - if (ret) - pr_warn("failed to add legacy heap: %pe\n", - ERR_PTR(ret)); } return 0; } -module_init(add_default_cma_heap); +module_init(add_cma_heaps); MODULE_DESCRIPTION("DMA-BUF CMA Heap"); |