Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Following a hang and reset, we know that the engine is idle and all
> context state has been saved or lost. Consequently, we know that the
> engine is no longer referencing the last context and we can relinquish
> our tracking.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> Cc: Tvrtko Ursulin <tursulin@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 730804ce9610..638b335e72b6 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2788,8 +2788,14 @@ void i915_gem_reset(struct drm_i915_private *dev_priv)
>
> i915_gem_retire_requests(dev_priv);
>
> - for_each_engine(engine, dev_priv, id)
> + for_each_engine(engine, dev_priv, id) {
> + struct i915_gem_context *ctx;
> +
> i915_gem_reset_engine(engine);
> + ctx = fetch_and_zero(&engine->last_retired_context);
> + if (ctx)
> + engine->context_unpin(engine, ctx);
> + }
>
> i915_gem_restore_fences(dev_priv);
>
> --
> 2.11.0
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