[Freedreno] [PATCH v2 2/2] drm/msm: Hangcheck progress detection

[Dmitry Baryshkov]

On 02/11/2022 01:33, Rob Clark wrote:
> From: Rob Clark <robdclark at chromium.org>
> 
> If the hangcheck timer expires, check if the fw's position in the
> cmdstream has advanced (changed) since last timer expiration, and
> allow it up to three additional "extensions" to it's alotted time.
> The intention is to continue to catch "shader stuck in a loop" type
> hangs quickly, but allow more time for things that are actually
> making forward progress.

Just out of curiosity: wouldn't position also change for a 'shader stuck 
in a loop'?


> Because we need to sample the CP state twice to detect if there has
> not been progress, this also cuts the the timer's duration in half.
> 
> v2: Fix typo (REG_A6XX_CP_CSQ_IB2_STAT), add comment
> 
> Signed-off-by: Rob Clark <robdclark at chromium.org>
> Reviewed-by: Akhil P Oommen <quic_akhilpo at quicinc.com>



-- 
With best wishes
Dmitry