Comment # 4
on bug 105359
from Marta Löfstedt
https://patchwork.freedesktop.org/patch/208170/ This caused some discussion. I appears as if devs want a way for user space to reset the "fbc state". I am assuming this also applies for FIFO underrun caused FBC disabled. I guess that is OK, the only one calling: intel_fbc_handle_fifo_underrun_irq(dev_priv); is: void intel_cpu_fifo_underrun_irq_handler(struct drm_i915_private *dev_priv, enum pipe pipe) However, this comment in above function: /* There's no guarantee that underrun_detected won't be set to true * right after this check and before the work is scheduled, but that's * not a problem since we'll check it again under the work function * while FBC is locked. This check here is just to prevent us from * unnecessarily scheduling the work, and it relies on the fact that we * never switch underrun_detect back to false after it's true. */ so maybe not totally straight forward to implement. Also, I believe that the massive hit from "FBC disabled" on kasan and shard testlist on BAT is due to this FBC banned by FIFO underrun thing.
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