[PATCH 00/26] DP MST Refactors + debugging tools + suspend/resume reprobing

[Lyude Paul]

This is the large series for adding MST suspend/resume reprobing that
I've been working on for quite a while now. In addition, I:

- Refactored and cleaned up any code I ended up digging through in the
  process of understanding how some parts of these helpers worked.
- Added some debugging tools along the way that I ended up needing to
  figure out some issues in my own code

Note that there's still one important part of this process missing
that's not included in this patch series: EDID reprobing, which I
believe Stanislav Lisovskiy from Intel is currently working on. The main
purpose of this series is to fix the issue of the in-memory topology
state (e.g. connectors connected to an MST hub, branch devices, etc.)
going out of sync if a topology connected to a connector is swapped out
with a different topology while the system is resumed, or while the
device housing said connector is in runtime suspend.

As well, the debugging tools that are added in this include:
- A limited debugging utility for dumping the list of topology
  references on an MST port or branch connector whose topology reference
  count has reached 0
- Sideband down request dumping, along with some basic selftests for
  testing our encoding/decoding functions

Cc: Juston Li <juston.li at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Harry Wentland <hwentlan at amd.com>

Lyude Paul (26):
  drm/dp_mst: Move link address dumping into a function
  drm/dp_mst: Destroy mstbs from destroy_connector_work
  drm/dp_mst: Move test_calc_pbn_mode() into an actual selftest
  drm/print: Add drm_err_printer()
  drm/dp_mst: Add sideband down request tracing + selftests
  drm/dp_mst: Move PDT teardown for ports into destroy_connector_work
  drm/dp_mst: Get rid of list clear in drm_dp_finish_destroy_port()
  drm/dp_mst: Refactor drm_dp_send_enum_path_resources
  drm/dp_mst: Remove huge conditional in drm_dp_mst_handle_up_req()
  drm/dp_mst: Constify guid in drm_dp_get_mst_branch_by_guid()
  drm/dp_mst: Refactor drm_dp_mst_handle_up_req()
  drm/dp_mst: Refactor drm_dp_mst_handle_down_rep()
  drm/dp_mst: Destroy topology_mgr mutexes
  drm/dp_mst: Cleanup drm_dp_send_link_address() a bit
  drm/dp_mst: Refactor pdt setup/teardown, add more locking
  drm/dp_mst: Rename drm_dp_add_port and drm_dp_update_port
  drm/dp_mst: Remove lies in {up,down}_rep_recv documentation
  drm/dp_mst: Handle UP requests asynchronously
  drm/dp_mst: Protect drm_dp_mst_port members with connection_mutex
  drm/dp_mst: Don't forget to update port->input in
    drm_dp_mst_handle_conn_stat()
  drm/nouveau: Don't grab runtime PM refs for HPD IRQs
  drm/amdgpu: Iterate through DRM connectors correctly
  drm/amdgpu/dm: Resume short HPD IRQs before resuming MST topology
  drm/dp_mst: Add basic topology reprobing when resuming
  drm/dp_mst: Also print unhashed pointers for malloc/topology
    references
  drm/dp_mst: Add topology ref history tracking for debugging

 drivers/gpu/drm/Kconfig                       |   14 +
 .../gpu/drm/amd/amdgpu/amdgpu_connectors.c    |   13 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |   20 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   |    5 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c  |   40 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c       |    5 +-
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c        |   34 +-
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c        |   34 +-
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c         |   40 +-
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c         |   34 +-
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |   41 +-
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c |   10 +-
 drivers/gpu/drm/drm_dp_mst_topology.c         | 1592 +++++++++++++----
 .../gpu/drm/drm_dp_mst_topology_internal.h    |   24 +
 drivers/gpu/drm/drm_print.c                   |    6 +
 drivers/gpu/drm/i915/display/intel_dp.c       |    3 +-
 drivers/gpu/drm/nouveau/dispnv50/disp.c       |    6 +-
 drivers/gpu/drm/nouveau/nouveau_connector.c   |   33 +-
 drivers/gpu/drm/selftests/Makefile            |    2 +-
 .../gpu/drm/selftests/drm_modeset_selftests.h |    2 +
 .../drm/selftests/test-drm_dp_mst_helper.c    |  248 +++
 .../drm/selftests/test-drm_modeset_common.h   |    2 +
 include/drm/drm_dp_mst_helper.h               |  127 +-
 include/drm/drm_print.h                       |   17 +
 24 files changed, 1846 insertions(+), 506 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_dp_mst_topology_internal.h
 create mode 100644 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c

-- 
2.21.0