[02/24] drm/i915/gt: Ignore repeated attempts to suspend request flow across reset

Before reseting the engine, we suspend the execution of the guilty
request, so that we can continue execution with a new context while we
slowly compress the captured error state for the guilty context. However,
if the reset fails, we will promptly attempt to reset the same request
again, and discover the ongoing capture. Ignore the second attempt to
suspend and capture the same request.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1168
Fixes: 32ff621fd744 ("drm/i915/gt: Allow temporary suspension of inflight requests")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: <stable@vger.kernel.org> # v5.7+
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++
 1 file changed, 3 insertions(+)

Chris Wilson <chris@chris-wilson.co.uk> writes:

> Before reseting the engine, we suspend the execution of the guilty
> request, so that we can continue execution with a new context while we
> slowly compress the captured error state for the guilty context. However,
> if the reset fails, we will promptly attempt to reset the same request
> again, and discover the ongoing capture. Ignore the second attempt to
> suspend and capture the same request.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1168
> Fixes: 32ff621fd744 ("drm/i915/gt: Allow temporary suspension of inflight requests")
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: <stable@vger.kernel.org> # v5.7+

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_lrc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 43703efb36d1..1d209a8a95e8 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -2823,6 +2823,9 @@ static void __execlists_hold(struct i915_request *rq)
>  static bool execlists_hold(struct intel_engine_cs *engine,
>  			   struct i915_request *rq)
>  {
> +	if (i915_request_on_hold(rq))
> +		return false;
> +
>  	spin_lock_irq(&engine->active.lock);
>  
>  	if (i915_request_completed(rq)) { /* too late! */
> -- 
> 2.20.1
>
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