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authorJeffrey Hugo <quic_jhugo@quicinc.com>2022-03-07 08:32:36 -0700
committerDaniel Vetter <daniel.vetter@ffwll.ch>2022-03-17 10:37:08 +0100
commitaa457ff1b2be72c0d89ee2118769859e513e6fc8 (patch)
treeb96c911206eb57e08c05ac98483126093720d17d /Documentation/gpu
parentf33b21f1397ee0f22f1d514cf6c3344c6c731a8b (diff)
downloadlinux-aa457ff1b2be72c0d89ee2118769859e513e6fc8.tar.bz2
drm/doc: Clarify what ioctls can be used on render nodes
The documentation for render nodes indicates that only "PRIME-related" ioctls are valid on render nodes, but the documentation does not clarify what that means. If the reader is not familiar with PRIME, they may beleive this to be only the ioctls with "PRIME" in the name and not other ioctls such as set of syncobj ioctls. Clarify the situation for the reader by referencing where the reader will find a current list of valid ioctls. Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1646667156-16366-1-git-send-email-quic_jhugo@quicinc.com
Diffstat (limited to 'Documentation/gpu')
-rw-r--r--Documentation/gpu/drm-uapi.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
index 199afb503ab1..ce47b4292481 100644
--- a/Documentation/gpu/drm-uapi.rst
+++ b/Documentation/gpu/drm-uapi.rst
@@ -148,7 +148,9 @@ clients together with the legacy drmAuth authentication procedure.
If a driver advertises render node support, DRM core will create a
separate render node called renderD<num>. There will be one render node
per device. No ioctls except PRIME-related ioctls will be allowed on
-this node. Especially GEM_OPEN will be explicitly prohibited. Render
+this node. Especially GEM_OPEN will be explicitly prohibited. For a
+complete list of driver-independent ioctls that can be used on render
+nodes, see the ioctls marked DRM_RENDER_ALLOW in drm_ioctl.c Render
nodes are designed to avoid the buffer-leaks, which occur if clients
guess the flink names or mmap offsets on the legacy interface.
Additionally to this basic interface, drivers must mark their