[Intel-gfx] [RFC 00/21] Replace seqno values with request structures

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Work in progress for replacing seqno usage with requst structures.

There is a general feeling that it is better to move away from using a simple
integer 'seqno' value to track batch buffer completion. Instead, the request
structure should be used. That provides for much more flexibility going
forwards. Especially which things like a GPU scheduler (which can re-order batch
buffers and hence seqnos after submission to the hardware), Android sync points
and other such features which potentially make seqno usage more and more
complex.

The current set of patches do most of the seqno to request structure conversion.
There are still a couple of direct seqno comparisons in the semaphore code. The
final conversion of a seqno test into a 'completed' flag inside the request
structure is still do to as well. Along with whatever changes are required to
maintain such a flag.

The patches are being posted now to make sure that the various people involved
agree that it is heading in the right direction.

[Patches against drm-intel-nightly tree fetched 11/09/2014]

John Harrison (21):
  Bug: missing i915_seqno_passed() call?
  drm/i915: Remove redundant parameter to i915_gem_object_wait_rendering__tail()
  drm/i915: Ensure OLS & PLR are always in sync
  drm/i915: Add reference count to request structure
  drm/i915: Add helper functions to aid seqno -> request transition
  drm/i915: Replace last_[rwf]_seqno with last_[rwf]_req
  drm/i915: Ensure requests stick around during waits
  drm/i915: Remove 'outstanding_lazy_seqno'
  drm/i915: Make 'i915_gem_check_olr' actually check by request not seqno
  drm/i915: Convert 'last_flip_req' to be a request not a seqno
  drm/i915: Convert i915_wait_seqno to i915_wait_request
  drm/i915: Convert 'i915_add_request' to take a request not a seqno
  drm/i915: Convert mmio_flip::seqno to struct request
  drm/i915: Convert 'flip_queued_seqno' into 'flip_queued_request'
  drm/i915: Convert most 'i915_seqno_passed' calls into 'i915_gem_request_completed'
  drm/i915: Convert __wait_seqno() to __wait_request()
  drm/i915: Convert trace functions from seqno to request
  drm/i915: Convert 'trace_irq' to use requests rather than seqnos
  drm/i915: Convert semaphores to handle requests not seqnos
  drm/i915: Convert 'ring_idle()' to use requests not seqnos
  drm/i915: Remove 'obj->ring'

 drivers/gpu/drm/i915/i915_debugfs.c        |   23 +--
 drivers/gpu/drm/i915/i915_drv.h            |   64 +++++--
 drivers/gpu/drm/i915/i915_gem.c            |  265 ++++++++++++++--------------
 drivers/gpu/drm/i915/i915_gem_context.c    |   12 +-
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    8 +-
 drivers/gpu/drm/i915/i915_gem_gtt.h        |    4 +-
 drivers/gpu/drm/i915/i915_gem_tiling.c     |    2 +-
 drivers/gpu/drm/i915/i915_gpu_error.c      |   19 +-
 drivers/gpu/drm/i915/i915_irq.c            |   12 +-
 drivers/gpu/drm/i915/i915_trace.h          |   47 ++---
 drivers/gpu/drm/i915/intel_display.c       |   47 ++---
 drivers/gpu/drm/i915/intel_drv.h           |    4 +-
 drivers/gpu/drm/i915/intel_lrc.c           |   49 ++---
 drivers/gpu/drm/i915/intel_overlay.c       |   17 +-
 drivers/gpu/drm/i915/intel_ringbuffer.c    |   88 +++++----
 drivers/gpu/drm/i915/intel_ringbuffer.h    |   24 ++-
 16 files changed, 392 insertions(+), 293 deletions(-)

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1.7.9.5