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Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/dma-buf-heaps.rst | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst index 535f49047ce6..1dfe5e7acd5a 100644 --- a/Documentation/userspace-api/dma-buf-heaps.rst +++ b/Documentation/userspace-api/dma-buf-heaps.rst @@ -19,7 +19,10 @@ following heaps: - The ``cma`` heap allocates physically contiguous, cacheable, buffers. Only present if a CMA region is present. Such a region is usually created either through the kernel commandline through the - `cma` parameter, a memory region Device-Tree node with the - `linux,cma-default` property set, or through the `CMA_SIZE_MBYTES` or - `CMA_SIZE_PERCENTAGE` Kconfig options. Depending on the platform, it - might be called ``reserved``, ``linux,cma``, or ``default-pool``. + ``cma`` parameter, a memory region Device-Tree node with the + ``linux,cma-default`` property set, or through the ``CMA_SIZE_MBYTES`` or + ``CMA_SIZE_PERCENTAGE`` Kconfig options. The heap's name in devtmpfs is + ``default_cma_region``. For backwards compatibility, when the + ``DMABUF_HEAPS_CMA_LEGACY`` Kconfig option is set, a duplicate node is + created following legacy naming conventions; the legacy name might be + ``reserved``, ``linux,cma``, or ``default-pool``. |