Quoting Marius Vlad (2017-09-04 16:16:41) > From: Marius Vlad <marius.vlad0@xxxxxxxxx> > > Currently driver-specific ioctls have to be declared static and are confined to > DRM core driver. This patch series provides the means to remove those constrains > and allow to register driver-specific ioctls dynamically by keeping a list of > registered ioctls in struct drm_driver, then each component of the driver can > then register its own specific ioctls using this interface. > > The driver must assign ioctl_register/ioctl_deregister in > its drm_driver structure in order to make use of it. > > While SoC drivers benefit the most from this approach (by not polluting DRM core > driver and allowing sub drivers to implement and register driver-specific > ioctls dynamically), further patches shows how easy is to convert drm/i915 to > this approach by registering GEM and perf ioctls separately. Why? You do not have to use drm_ioctl directly... Avoiding it would reduce our ioctl overhead considerably, for example reducing busy_ioctl from around 110ns to around 45ns. -Chris _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
