[Bug 83482] [BDW Bisected] "bdw: Apply workarounds in render ring init function" reduced performance 10%~40%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83482

--- Comment #3 from Jani Nikula <jani.nikula at intel.com> ---
Created attachment 106369
  --> https://bugs.freedesktop.org/attachment.cgi?id=106369&action=edit
DEBUG: drm/i915: add i915.wa module parameter to control bdw workarounds

Here's a patch to add a i915.wa module parameter to control the workarounds to
be applied. Please read the commit message for details.

Please apply this on top of drm-intel-nightly, confirm you still have the perf
regression, and drop workarounds one by one (or in groups as necessary, but
gets harder) to try to find out which specific workaround makes the difference.

Chris, do you have any further comments on this?

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