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| author | Jared Kangas <jkangas@redhat.com> | 2025-06-10 06:12:31 -0700 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@linaro.org> | 2025-07-09 15:51:40 +0530 |
| commit | 854acbe75ff406ea2c72ef3048578dfd99425ba9 (patch) | |
| tree | ddb1b5357ff40ac6870dc0923c1aeef3c1398596 /Documentation/userspace-api | |
| parent | 86e59cc5069700361041aa5bf536a8a66be6b9ec (diff) | |
| download | tip-854acbe75ff406ea2c72ef3048578dfd99425ba9.tar.gz | |
dma-buf: heaps: Give default CMA heap a fixed name
The CMA heap's name in devtmpfs can vary depending on how the heap is
defined. Its name defaults to "reserved", but if a CMA area is defined
in the devicetree, the heap takes on the devicetree node's name, such as
"default-pool" or "linux,cma". To simplify naming, unconditionally name
it "default_cma_region", but keep a legacy node in place backed by the
same underlying allocator for backwards compatibility.
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Jared Kangas <jkangas@redhat.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://lore.kernel.org/r/20250610131231.1724627-4-jkangas@redhat.com
Diffstat (limited to 'Documentation/userspace-api')
| -rw-r--r-- | Documentation/userspace-api/dma-buf-heaps.rst | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst index 23bd0bd7b06540..1dfe5e7acd5a3c 100644 --- a/Documentation/userspace-api/dma-buf-heaps.rst +++ b/Documentation/userspace-api/dma-buf-heaps.rst @@ -21,5 +21,8 @@ following heaps: 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_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``. |