ae911b23d2
A gpu hang can occur at any time, given a sufficiently angry gpu. An example is when it forgets to perform a context-switch at the end of a request, leaving us with a hanging GPU on a completed request. Here, we may retire the request, only leaving its context alive via the active barrier. When we reset the GPU on a completed request, we do not modify its context image (just updating the ring state) and can safely defer the assertion that we have the image pinned and ready to modify. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111639 Fixes: dffa8feb3084 ("drm/i915/perf: Assert locking for i915_init_oa_perf_state()") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190923110056.15176-1-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.