[PATCH v3] drm/i915/gen11: Preempt-to-idle support in execlists - v3 notes.

[Tomasz Lis <tomasz.lis@intel.com>]

The review of v2 changes touched issues which were addressed in a different way
than planned in that review:

1. Context status processing

While the review went towards finding common path to new preemption flag
combinations and existing cases, I decided to split the two ways, because
the !(status & GEN8_CTX_STATUS_COMPLETED_MASK) condition had to be skipped
from the preemption flow. While pre-gen11 preemption always executed the
preemptive context which guaranteed that flag set, nothing finishes execution
in the new to-real-idle preemption.

2. Testing of the idle-to-idle preemption case

It turns out the IGT test 'smoketest-render' from 'gem_exec_schedule' group
triggers the idle-to-idle case. The test submits a lot of very  short execs
with changing priorities. Its run triggers preemption many times. and due to
the short exec buffer, triggers idle-to-idle case as well, sooner or later.

Tomasz Lis (1):
  drm/i915/gen11: Preempt-to-idle support in execlists.

 drivers/gpu/drm/i915/i915_drv.h          |   2 +
 drivers/gpu/drm/i915/i915_gem_context.c  |   5 +-
 drivers/gpu/drm/i915/i915_pci.c          |   3 +-
 drivers/gpu/drm/i915/intel_device_info.h |   1 +
 drivers/gpu/drm/i915/intel_lrc.c         | 115 ++++++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_lrc.h         |   1 +
 6 files changed, 92 insertions(+), 35 deletions(-)

-- 
2.7.4

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