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0a544a2a72
As preempt-to-busy leaves the request on the HW as the resubmission is processed, that request may complete in the background and even cause a second virtual request to enter queue. This second virtual request breaks our "single request in the virtual pipeline" assumptions. Furthermore, as the virtual request may be completed and retired, we lose the reference the virtual engine assumes is held. Normally, just removing the request from the scheduler queue removes it from the engine, but the virtual engine keeps track of its singleton request via its ve->request. This pointer needs protecting with a reference. v2: Drop unnecessary motion of rq->engine = owner Fixes:22b7a426bb("drm/i915/execlists: Preempt-to-busy") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190923152844.8914-1-chris@chris-wilson.co.uk (cherry picked from commitb647c7df01) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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.