Chris Wilson writes:
> If we cannot trust the reset will flush out the CS event queue such that
> process_csb() reports an accurate view of HW, we will need to search the
> active and pending contexts to determine which was actually running at
> the time we issued the reset.
>
> Signed-off-by: Chris Wilson
Reviewed-by: Mika Kuoppala
> ---
> drivers/gpu/drm/i915/gt/intel_engine_types.h | 5 +
> drivers/gpu/drm/i915/gt/intel_lrc.c | 4 +++-
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> index 80cdde712842..4804587442e7 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> @@ -166,6 +166,11 @@ struct intel_engine_execlists {
>*/
> u32 error_interrupt;
>
> + /**
> + * @reset_ccid: Active CCID [EXECLISTS_STATUS_HI] at the time of reset
> + */
> + u32 reset_ccid;
> +
> /**
>* @no_priolist: priority lists disabled
>*/
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
> b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index f028114714cd..55bf3cdf3b38 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -3724,6 +3724,8 @@ static void execlists_reset_prepare(struct
> intel_engine_cs *engine)
>*/
> ring_set_paused(engine, 1);
> intel_engine_stop_cs(engine);
> +
> + engine->execlists.reset_ccid = active_ccid(engine);
> }
>
> static void reset_csb_pointers(struct intel_engine_cs *engine)
> @@ -3798,7 +3800,7 @@ static void __execlists_reset(struct intel_engine_cs
> *engine, bool stalled)
>* its request, it was still running at the time of the
>* reset and will have been clobbered.
>*/
> - rq = execlists_active(execlists);
> + rq = active_context(engine, engine->execlists.reset_ccid);
> if (!rq)
> goto unwind;
>
> --
> 2.20.1
>
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