[RFC,0/7] drm/i915: ttm for stolen

Message

Bob Beckett March 15, 2022, 6:04 p.m. UTC

Refactor stolen gem backend to use ttm.

While this series is finished off to handle CI issues, I would
appreciate a design review.
In particulare any opinions on the following would be appreciated:

1. display fbc code using gem objects instead of drm_mm_node. The intent
is rely on memory region as interface, instead of relying on knowledge
of internals. This way ttm can be used in place of original stolen
region without issue.

2. checking if a region has anything alloceted within a range. Instead
of relying on internal access to the stolen region's drm_mm, add an
interface to check if the range is busy that can work with any backend
if implemetned.

3. Instead of region busy checking which is currently only used in
testing, would we prefer a more general interface that could potentially
be used for other infrastructure? e.g. for_each with callback over
each resource/buffer within the range.

Robert Beckett (7):
  drm/i915: instantiate ttm ranger manager for stolen memory
  drm/i915: add ability to create memory region object in place
  drm/i915: use gem objects to track stolen nodes
  drm/i915: stolen memory use ttm backend
  drm/ttm: add range busy check for range manager
  drm/i915: add range busy check for ttm region
  drm/i915: cleanup old stolen state

 drivers/gpu/drm/i915/display/intel_fbc.c   |  76 +++--
 drivers/gpu/drm/i915/gem/i915_gem_region.c |  55 ++++
 drivers/gpu/drm/i915/gem/i915_gem_region.h |   6 +
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 351 +++------------------
 drivers/gpu/drm/i915/gem/i915_gem_stolen.h |  16 +-
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c    |  84 ++++-
 drivers/gpu/drm/i915/gem/i915_gem_ttm.h    |   7 +
 drivers/gpu/drm/i915/gt/selftest_reset.c   |  16 +-
 drivers/gpu/drm/i915/i915_drv.h            |   5 -
 drivers/gpu/drm/i915/intel_memory_region.h |   6 +
 drivers/gpu/drm/i915/intel_region_ttm.c    |  48 ++-
 drivers/gpu/drm/i915/intel_region_ttm.h    |   3 +
 drivers/gpu/drm/ttm/ttm_range_manager.c    |  21 ++
 include/drm/ttm/ttm_range_manager.h        |   3 +
 14 files changed, 306 insertions(+), 391 deletions(-)