visible to user-space and accessible beyond open-file boundaries, they
cannot support render nodes.
+
+Testing and validation
+======================
+
Validating changes with IGT
-===========================
+---------------------------
There's a collection of tests that aims to cover the whole functionality of
DRM drivers and that can be used to check that changes to DRM drivers or the
the -t options. A report in HTML format will be available in
./results/html/index.html. Results can be compared with piglit.
+Display CRC Support
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_debugfs_crc.c
+ :doc: CRC ABI
+
VBlank event handling
=====================
mode setting, since on many devices the vertical blank counter is
reset to 0 at some point during modeset. Modern drivers should not
call this any more since with kernel mode setting it is a no-op.
-
-This second part of the GPU Driver Developer's Guide documents driver
-code, implementation details and also all the driver-specific userspace
-interfaces. Especially since all hardware-acceleration interfaces to
-userspace are driver specific for efficiency and other reasons these
-interfaces can be rather substantial. Hence every driver has its own
-chapter.
-
-Testing and validation
-======================
-
-.. kernel-doc:: drivers/gpu/drm/drm_debugfs_crc.c
- :doc: CRC ABI