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| -rw-r--r-- | Documentation/gpu/drm-kms.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index b11c537c73f422..1c42448c7aae93 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -161,6 +161,28 @@ KMS Core Structures and Functions Modeset Base Object Abstraction =============================== +.. kernel-render:: DOT + :alt: Mode Objects and Properties + :caption: Mode Objects and Properties + + digraph { + node [shape=box] + + "drm_property A" -> "drm_mode_object A" + "drm_property A" -> "drm_mode_object B" + "drm_property B" -> "drm_mode_object A" + } + +The base structure for all KMS objects is :c:type:`struct drm_mode_object +<drm_mode_object>`. One of the base services it provides is tracking properties, +which are especially important for the atomic IOCTL (see `Atomic Mode +Setting`_). The somewhat surprising part here is that properties are not +directly instantiated on each object, but free-standing mode objects themselves, +represented by :c:type:`struct drm_property <drm_property>`, which only specify +the type and value range of a property. Any given property can be attached +multiple times to different objects using :c:func:`drm_object_attach_property() +<drm_object_attach_property>`. + .. kernel-doc:: include/drm/drm_mode_object.h :internal: |