[Intel-gfx] [PATCH 0/3] GTFIFODBG

[Ben Widawsky]

The GTFIFODBG registers gives us some info regarding the state of the
GT FIFO. In the following patches we therefore add a few things:
1. Add the register definition, and clear previous errors.
2. Check if any failures occurred when doing a forcewake_put.
3. Check if any failures occurred after reaching the low watermark of the
write threshold. This differs from #2 slightly in that there is an extra
error bit which seems to indicate a read error in the register. It is my
suspicion though that #2, and #3 will often be redundant, but since the
clearing of the register occurs during the check, you will only see one
message.

I've only done some basic checks for performance regressions, and found
none.

Ben Widawsky (3):
  drm/i915: use gtfifodbg
  drm/i915: catch gtfifo errors on forcewake_put
  drm/i915: check gtfifodbg after possibly failed writes

 drivers/gpu/drm/i915/i915_drv.c      |   30 +++++++++++++++++++++++++-----
 drivers/gpu/drm/i915/i915_drv.h      |    2 +-
 drivers/gpu/drm/i915/i915_reg.h      |    6 ++++++
 drivers/gpu/drm/i915/intel_display.c |    8 ++++++++
 4 files changed, 40 insertions(+), 6 deletions(-)

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1.7.9