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This emulates execlists on top of the GuC in order to defer submission of requests to the hardware. This deferral allows time for high priority requests to gazump their way to the head of the queue, however it nerfs the GuC by converting it back into a simple execlist (where the CPU has to wake up after every request to feed new commands into the GuC). v2: Drop hack status - though iirc there is still a lockdep inversion between fence and engine->timeline->lock (which is impossible as the nesting only occurs on different fences - hopefully just requires some judicious lockdep annotation) v3: Apply lockdep nesting to enabling signaling on the request, using the pattern we already have in __i915_gem_request_submit(); v4: Replaying requests after a hang also now needs the timeline spinlock, to disable the interrupts at least v5: Hold wq lock for completeness, and emit a tracepoint for enabling signal v6: Reorder interrupt checking for a happier gcc. v7: Only signal the tasklet after a user-interrupt if using guc scheduling v8: Restore lost update of rq through the i915_guc_irq_handler (Tvrtko) v9: Avoid re-initialising the engine->irq_tasklet from inside a reset v10: Hook up the execlists-style tracepoints v11: Clear the execlists irq_posted bit after taking over the interrupt/tasklet Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170316125619.6856-1-chris@chris-wilson.co.uk Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.