We decay hangcheck score, instead of setting it to zero, when seqno moves forward. This was added as mechanism to detect batches full of invalid waits. But with multiple runs of very intensive batches (shader tests), the score accumulates even without wait/kick pairs only by engine being active inside shader loops multiple times in succession.
Prevent this mechanism to falsely trigger on loops by decaying faster than we accumulate during active looping. Cc: Chris Wilson <[email protected]> Signed-off-by: Mika Kuoppala <[email protected]> --- drivers/gpu/drm/i915/i915_irq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 6ed6571..3507269 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -3009,6 +3009,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work) #define BUSY 1 #define KICK 5 #define HUNG 20 +#define BUSY_DECAY (2*BUSY) if (!i915.enable_hangcheck) return; @@ -3084,8 +3085,8 @@ static void i915_hangcheck_elapsed(struct work_struct *work) /* Gradually reduce the count so that we catch DoS * attempts across multiple batches. */ - if (ring->hangcheck.score > 0) - ring->hangcheck.score--; + if (ring->hangcheck.score > BUSY_DECAY) + ring->hangcheck.score -= BUSY_DECAY; ring->hangcheck.acthd = ring->hangcheck.max_acthd = 0; } -- 2.5.0 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
