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Render nodes provide an API for userspace to use non-privileged GPU commands without any running DRM-Master. It is useful for offscreen rendering, GPGPU clients, and normal render clients which do not perform modesetting. Compared to legacy clients, render clients no longer need any authentication to perform client ioctls. Instead, user-space controls render/client access to GPUs via filesystem access-modes on the render-node. Once a render-node was opened, a client has full access to the client/render operations on the GPU. However, no modesetting or ioctls that affect global state are allowed on render nodes. To prevent privilege-escalation, drivers must explicitly state that they support render nodes. They must mark their render-only ioctls as DRM_RENDER_ALLOW so render clients can use them. Furthermore, they must support clients without any attached master. If filesystem access-modes are not enough for fine-grained access control to render nodes (very unlikely, considering the versaitlity of FS-ACLs), you may still fall-back to fd-passing from server to client (which allows arbitrary access-control). However, note that revoking access is currently impossible and unlikely to get implemented. Note: Render clients no longer have any associated DRM-Master as they are supposed to be independent of any server state. DRM core highly depends on file_priv->master to be non-NULL for modesetting/ctx/etc. commands. Therefore, drivers must be very careful to not require DRM-Master if they support DRIVER_RENDER. So far render-nodes are protected by "drm_rnodes". As long as this module-parameter is not set to 1, a driver will not create render nodes. This allows us to experiment with the API a bit before we stabilize it. v2: drop insecure GEM_FLINK to force use of dmabuf Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com> |
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| 80211.tmpl | ||
| alsa-driver-api.tmpl | ||
| debugobjects.tmpl | ||
| device-drivers.tmpl | ||
| deviceiobook.tmpl | ||
| drm.tmpl | ||
| filesystems.tmpl | ||
| gadget.tmpl | ||
| genericirq.tmpl | ||
| kernel-api.tmpl | ||
| kernel-hacking.tmpl | ||
| kernel-locking.tmpl | ||
| kgdb.tmpl | ||
| libata.tmpl | ||
| librs.tmpl | ||
| lsm.tmpl | ||
| Makefile | ||
| media_api.tmpl | ||
| mtdnand.tmpl | ||
| networking.tmpl | ||
| rapidio.tmpl | ||
| regulator.tmpl | ||
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| writing-an-alsa-driver.tmpl | ||
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| z8530book.tmpl | ||