Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> intel_engine_init_globa_seqno() may be called from an uncontrolled
> set-wedged path where we have given up waiting for broken hw and declare
> it defunct. Along that path, any sanity checks that the hw is idle
> before we adjust its state will expectedly fail, so we simply cannot.
> Instead of asserting inside init_global_seqno, we move them to the
> normal caller reset_all_global_seqno() as it handles runtime seqno
> wraparound.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_gem_request.c | 4 ++++
> drivers/gpu/drm/i915/intel_engine_cs.c | 3 ---
> 2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
> index 483af8921060..d93a185c0f0a 100644
> --- a/drivers/gpu/drm/i915/i915_gem_request.c
> +++ b/drivers/gpu/drm/i915/i915_gem_request.c
> @@ -213,6 +213,10 @@ static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
> cond_resched();
> }
>
> + /* Check we are idle before we fiddle with hw state! */
> + GEM_BUG_ON(!intel_engine_is_idle(engine));
> + GEM_BUG_ON(i915_gem_active_isset(&engine->timeline->last_request));
> +
> /* Finally reset hw state */
> intel_engine_init_global_seqno(engine, seqno);
> tl->seqno = seqno;
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
> index fbac94557ffa..19297e6aab41 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -337,9 +337,6 @@ void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno)
> {
> struct drm_i915_private *dev_priv = engine->i915;
>
> - GEM_BUG_ON(!intel_engine_is_idle(engine));
> - GEM_BUG_ON(i915_gem_active_isset(&engine->timeline->last_request));
> -
> /* Our semaphore implementation is strictly monotonic (i.e. we proceed
> * so long as the semaphore value in the register/page is greater
> * than the sync value), so whenever we reset the seqno,
> --
> 2.13.2
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