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.
Chris Wilson
authored
To implement preempt-to-busy (and so efficient timeslicing and best utilization of the hardware submission ports) we let the GPU run asynchronously in respect to the ELSP submission queue. This created challenges in keeping and accessing the driver state mirroring the asynchronous GPU execution. Previous fix 1d9221e9 ("drm/i915: Skip signaling a signaled request") however did not correctly serialize request retirement with the execution callbacks. We were using the i915_request.lock to serialise adding an execution callback with __i915_request_submit. However, if we use an atomic llist_add to serialise multiple waiters and then check to see if the request is already executing, we can remove the irq-spinlock and fix serialization between retirement and execution callbacks in one go. v2: Avoid using the irq_work when outside of the irq-spinlocks, where we can execute the callbacks immediately. v3: Pay close attention to the order of setting ACTIVE on retirement, we need to ensure the request is signaled and breadcrumbs detached before we finish removing the request from the engine. v4: Expanded commit message. Fixes: 1d9221e9 ("drm/i915: Skip signaling a signaled request") Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200716142207.13003-2-chris@chris-wilson.co.uk Signed-off-by:
Rodrigo Vivi <rodrigo.vivi@intel.com> [Joonas: Rebased and reordered into drm-intel-gt-next branch] [Joonas: Added expanded commit message from Tvrtko and Chris] Signed-off-by:
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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