From: John Harrison John.C.Harrison@Intel.com
Compute workloads are inherently not pre-emptible on current hardware. Thus the pre-emption timeout was disabled as a workaround to prevent unwanted resets. Instead, the hang detection was left to the heartbeat and its (longer) timeout. This is undesirable with GuC submission as the heartbeat is a full GT reset rather than a per engine reset and so is much more destructive. Instead, just bump the pre-emption timeout to a big value. Also, update the heartbeat to allow such a long pre-emption delay in the final heartbeat period.
v2: Add clamping helpers. v3: Remove long timeout algorithm and replace with hard coded value (review feedback from Tvrtko). Also, fix execlist selftest failure and fix bug in compute enabling patch related to pre-emption timeouts.
Signed-off-by: John Harrison John.C.Harrison@Intel.com
John Harrison (4): drm/i915/guc: Limit scheduling properties to avoid overflow drm/i915: Fix compute pre-emption w/a to apply to compute engines drm/i915: Make the heartbeat play nice with long pre-emption timeouts drm/i915: Improve long running OCL w/a for GuC submission
drivers/gpu/drm/i915/Kconfig.profile | 26 +++++- drivers/gpu/drm/i915/gt/intel_engine.h | 6 ++ drivers/gpu/drm/i915/gt/intel_engine_cs.c | 92 +++++++++++++++++-- .../gpu/drm/i915/gt/intel_engine_heartbeat.c | 18 ++++ drivers/gpu/drm/i915/gt/sysfs_engines.c | 25 +++-- drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h | 9 ++ 6 files changed, 153 insertions(+), 23 deletions(-)