[Mesa-dev] [PATCH v3 00/17] panfrost: Support batch pipelining

[Boris Brezillon]

Hello,

This is the third attempt at supporting batch pipelining. This time I
implemented it using a dependency graph (as suggested by Alyssa and
Steven) so that batch submission can be delayed even more: the only
time we flush batches now is when we have an explicit flush or when
the CPU needs to access a BO (we might want to tweak that a bit to
avoid the extra latency incurred by this solution). With that in place
we hope to increase GPU utilization.

Patches 15 and 16 are optional, but I remember reading (I think it was
Steven who mentioned that) that draw order matters when queueing render
operations for different frames (frame N should ideally be ready before
frame N+1). Not sure if enforcing draw call order is enough to guarantee
that rendering of frame N always finishes before frame N+1 though.
If that's something you don't want to merge, I can drop it.

Regards,

Boris

Boris Brezillon (17):
  panfrost: Extend the panfrost_batch_add_bo() API to pass access flags
  panfrost: Make panfrost_batch->bos a hash table
  panfrost: Add a batch fence
  panfrost: Use the per-batch fences to wait on the last submitted batch
  panfrost: Add a panfrost_freeze_batch() helper
  panfrost: Start tracking inter-batch dependencies
  panfrost: Prepare panfrost_fence for batch pipelining
  panfrost: Add a panfrost_flush_all_batches() helper
  panfrost: Add a panfrost_flush_batches_accessing_bo() helper
  panfrost: Kill the explicit serialization in panfrost_batch_submit()
  panfrost: Get rid of the flush in panfrost_set_framebuffer_state()
  panfrost: Add flags to reflect the BO imported/exported state
  panfrost: Make sure the BO is 'ready' when picked from the cache
  panfrost: Do fine-grained flushing when preparing BO for CPU accesses
  panfrost: Rename ctx->batches into ctx->fbo_to_batch
  panfrost: Take draw call order into account
  panfrost/ci: New tests are passing

 .../drivers/panfrost/ci/expected-failures.txt |   4 -
 src/gallium/drivers/panfrost/pan_allocate.c   |  14 +-
 src/gallium/drivers/panfrost/pan_blend_cso.c  |   6 +-
 src/gallium/drivers/panfrost/pan_bo.c         | 116 ++-
 src/gallium/drivers/panfrost/pan_bo.h         |  44 ++
 src/gallium/drivers/panfrost/pan_compute.c    |   2 +-
 src/gallium/drivers/panfrost/pan_context.c    | 121 ++--
 src/gallium/drivers/panfrost/pan_context.h    |  15 +-
 src/gallium/drivers/panfrost/pan_instancing.c |   5 +-
 src/gallium/drivers/panfrost/pan_job.c        | 668 ++++++++++++++++--
 src/gallium/drivers/panfrost/pan_job.h        |  58 +-
 src/gallium/drivers/panfrost/pan_resource.c   |  27 +-
 src/gallium/drivers/panfrost/pan_screen.c     |  65 +-
 src/gallium/drivers/panfrost/pan_screen.h     |   3 +-
 src/gallium/drivers/panfrost/pan_varyings.c   |  10 +-
 15 files changed, 956 insertions(+), 202 deletions(-)

-- 
2.21.0