[PATCH 00/10] Execlist based engine-reset

[Michel Thierry]

These patches are to add engine reset feature from Gen8. This is also
referred to as Timeout detection and recovery (TDR). This complements to
the full gpu reset feature available in i915 but it only allows to reset a
particular engine instead of all engines thus providing a light weight
engine reset and recovery mechanism.

This implementation is for execlist based submission only hence limited
from Gen8 onwards. For GuC based submission, additional changes can be
added later on.

Timeout detection relies on the existing hangcheck which remains the same,
main changes are to the recovery mechanism. Once we detect a hang on a
particular engine we identify the request that caused the hang, skip the
request and adjust head pointers to allow the execution to proceed
normally. After some cleanup, submissions are restarted to process
remaining work queued to that engine.

If engine reset fails to recover engine correctly then we fallback to full
gpu reset.

v2: ELSP queue request tracking and reset path changes to handle incomplete
requests during reset. Thanks to Chris Wilson for providing these patches.

v3: Let the waiter keep handling the full gpu reset if it already has the
lock; point out that GuC submission needs a different method to restart
workloads after the engine reset completes.

v4: Handle reset as 2 level resets, by first going to engine only and fall
backing to full/chip reset as needed, i.e. reset_engine will need the
struct_mutex.

Arun Siluvery (6):
  drm/i915: Update i915.reset to handle engine resets
  drm/i915/tdr: Modify error handler for per engine hang recovery
  drm/i915/tdr: Add support for per engine reset recovery
  drm/i915/tdr: Add engine reset count to error state
  drm/i915/tdr: Export per-engine reset count info to debugfs
  drm/i915/tdr: Enable Engine reset and recovery support

Michel Thierry (3):
  drm/i915: Keep i915_handle_error kerneldoc parameters together
  drm/i915: Update i915_reset parameter for kerneldoc
  drm/i915: Add engine reset count in get-reset-stats ioctl

Mika Kuoppala (1):
  drm/i915: Skip reset request if there is one already

 drivers/gpu/drm/i915/i915_debugfs.c     |  21 ++++++
 drivers/gpu/drm/i915/i915_drv.c         | 118 +++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_drv.h         |  16 +++++
 drivers/gpu/drm/i915/i915_gem.c         |   2 +-
 drivers/gpu/drm/i915/i915_gem_context.c |  14 +++-
 drivers/gpu/drm/i915/i915_gpu_error.c   |   3 +
 drivers/gpu/drm/i915/i915_irq.c         |  34 ++++++---
 drivers/gpu/drm/i915/i915_params.c      |   6 +-
 drivers/gpu/drm/i915/i915_params.h      |   2 +-
 drivers/gpu/drm/i915/i915_pci.c         |   5 +-
 drivers/gpu/drm/i915/intel_uncore.c     |  61 +++++++++++++++--
 include/uapi/drm/i915_drm.h             |   3 +-
 12 files changed, 258 insertions(+), 27 deletions(-)

-- 
2.11.0