[Intel-gfx] [RFC 0/4] Display uncore

[Daniele Ceraolo Spurio]

More focused proposal for display/GT uncore split.
A few notes/considerations:

- I've copied the MMIO ranges check in patch 3 from a patch from Ville
  that did something similar in regards to splitting GT/DE register
  access. I'm seeing some check failures on gen 3 and 4 [1], so I'd
  appreciate it if someone could double check those ranges since I'm
  not familiar with those gens. For the same reason I don't expect BAT
  to pass.

- Instead of doing a range check to find erroneous accesses, I
  considered using a new structure for display registers (wrapping
  i915_reg_t) and therefore force a compile-time check, but the sheer
  amount of register definitions that would need updating makes this
  hard to merge together with the switch to the new functions without
  hitting conflicts. If there is interest in this option, I'll put
  something out after all the display register accesses have
  transitioned to the new accessors.

- When MMIO debug is enabled, the accesses from GT and DE are still
  serialized because the HW debug infrastructure is shared. Since our
  testing defaults the MMIO debug on, we won't really test parallel
  accesses. After the series settles down I'm going to submit a CI run
  with MMIO debug off, but maybe we should update some tests to run
  with MMIO debug disabled. Thoughts? 

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>

[1] https://intel-gfx-ci.01.org/tree/drm-tip/Trybot_4491/?

Daniele Ceraolo Spurio (4):
  drm/i915: split out uncore_mmio_debug
  drm/i915: rework mmio debug stop/start
  drm/i915: introduce display_uncore
  drm/i915: convert intel_hdmi to display reg accessors

 drivers/gpu/drm/i915/display/intel_hdmi.c | 278 ++++++++++------------
 drivers/gpu/drm/i915/i915_debugfs.c       |   2 +-
 drivers/gpu/drm/i915/i915_drv.c           |  20 +-
 drivers/gpu/drm/i915/i915_drv.h           |  59 +++++
 drivers/gpu/drm/i915/intel_uncore.c       | 100 +++++---
 drivers/gpu/drm/i915/intel_uncore.h       |  18 +-
 6 files changed, 292 insertions(+), 185 deletions(-)

-- 
2.20.1