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In what seems remarkably similar to the w/a required to not reload an idle context with HEAD==TAIL, it appears we must prevent the HW from switching to an idle context in ELSP[1], while simultaneously trying to preempt the HW to run another context and a continuation of the idle context (which is no longer idle). We can achieve this by preventing the context from completing while we reload a new ELSP (by applying ring_set_paused(1) across the whole of dequeue), except this eventually fails due to a lite-restore into a waiting semaphore does not generate an ACK. Instead, we try to avoid making the GPU do anything too challenging and not submit a new ELSP while the interrupts + CSB events appear to have fallen behind the completed contexts. We expect it to catch up shortly so we queue another tasklet execution and hope for the best. Closes: https://gitlab.freedesktop.org/drm/intel/issues/1501 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200327201433.21864-1-chris@chris-wilson.co.uk
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.