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authorDavid Herrmann <dh.herrmann@gmail.com>2013-08-25 18:29:00 +0200
committerDave Airlie <airlied@gmail.com>2013-08-30 08:43:57 +1000
commit1793126fcebd7c18834f95d43b55e387a8803aa8 (patch)
tree4e8dddc699ac1fec52b3bb47ca6116d2654abc16 /include/drm
parent6cb3b7f1c013fd4bea41e16ee557bcb2f1561787 (diff)
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drm: implement experimental render nodes
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>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drmP.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 0e3d517..2907341 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -145,6 +145,7 @@ int drm_err(const char *func, const char *format, ...);
#define DRIVER_GEM 0x1000
#define DRIVER_MODESET 0x2000
#define DRIVER_PRIME 0x4000
+#define DRIVER_RENDER 0x8000
#define DRIVER_BUS_PCI 0x1
#define DRIVER_BUS_PLATFORM 0x2
@@ -290,6 +291,7 @@ typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
#define DRM_ROOT_ONLY 0x4
#define DRM_CONTROL_ALLOW 0x8
#define DRM_UNLOCKED 0x10
+#define DRM_RENDER_ALLOW 0x20
struct drm_ioctl_desc {
unsigned int cmd;
@@ -1204,6 +1206,7 @@ struct drm_device {
unsigned int agp_buffer_token;
struct drm_minor *control; /**< Control node for card */
struct drm_minor *primary; /**< render type primary screen head */
+ struct drm_minor *render; /**< render node for card */
struct drm_mode_config mode_config; /**< Current mode config */
@@ -1251,6 +1254,11 @@ static inline bool drm_modeset_is_locked(struct drm_device *dev)
return mutex_is_locked(&dev->mode_config.mutex);
}
+static inline bool drm_is_render_client(struct drm_file *file_priv)
+{
+ return file_priv->minor->type == DRM_MINOR_RENDER;
+}
+
/******************************************************************/
/** \name Internal function definitions */
/*@{*/
@@ -1450,6 +1458,7 @@ extern void drm_put_dev(struct drm_device *dev);
extern int drm_put_minor(struct drm_minor **minor);
extern void drm_unplug_dev(struct drm_device *dev);
extern unsigned int drm_debug;
+extern unsigned int drm_rnodes;
extern unsigned int drm_vblank_offdelay;
extern unsigned int drm_timestamp_precision;