Quoting Tvrtko Ursulin (2017-06-26 16:47:41) > From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> > > Engine discovery uAPI allows userspace to probe for engine > configuration and features without needing to maintain the > internal PCI id based database. > > This enables removal of code duplications across userspace > components. > > Probing is done via the new DRM_IOCTL_I915_GEM_ENGINE_INFO ioctl > which returns the number and information on the specified engine > class. > > Currently only general engine configuration and HEVC feature of > the VCS engine can be probed but the uAPI is designed to be > generic and extensible. > > Code is based almost exactly on the earlier proposal on the > topic by Jon Bloomfield. Engine class and instance refactoring > made recently by Daniele Ceraolo Spurio enabled this to be > implemented in an elegant fashion. > > To probe configuration userspace sets the engine class it wants > to query (struct drm_i915_gem_engine_info) and provides an array > of drm_i915_engine_info structs which will be filled in by the > driver. Userspace also has to tell i915 how many elements are in > the array, and the driver will report back the total number of > engine instances in any case. Include psuedo code to first show how to do the multipass query followed by an example hooking it to execbuf. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
