[Intel-gfx] [PATCH 2/2] drm/i915/gt: Pull context activation into central intel_context_pin()

[Maarten Lankhorst]

Op 08-01-2020 om 13:23 schreef Chris Wilson:
> While this is encroaching on midlayer territory, having already made the
> state allocation a previous step in pinning, we can now pull the common
> intel_context_active_acquire() into intel_context_pin() itself. This is
> a prelude to make the activation a separate step inside pinning, outside
> of the ce->pin_mutex
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Yeah, hopefully with both we can finally fix the issue.

With that, for both patches:

Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

>  drivers/gpu/drm/i915/gt/intel_context.c       | 64 ++++++++++---------
>  drivers/gpu/drm/i915/gt/intel_context.h       |  3 -
>  drivers/gpu/drm/i915/gt/intel_lrc.c           | 16 +----
>  .../gpu/drm/i915/gt/intel_ring_submission.c   | 16 +----
>  drivers/gpu/drm/i915/gt/mock_engine.c         |  2 +-
>  5 files changed, 39 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
> index eefe0996ade1..85f161fd46f8 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context.c
> +++ b/drivers/gpu/drm/i915/gt/intel_context.c
> @@ -63,6 +63,34 @@ int intel_context_alloc_state(struct intel_context *ce)
>  	return 0;
>  }
>  
> +static int intel_context_active_acquire(struct intel_context *ce)
> +{
> +	int err;
> +
> +	err = i915_active_acquire(&ce->active);
> +	if (err)
> +		return err;
> +
> +	/* Preallocate tracking nodes */
> +	if (!intel_context_is_barrier(ce)) {
> +		err = i915_active_acquire_preallocate_barrier(&ce->active,
> +							      ce->engine);
> +		if (err) {
> +			i915_active_release(&ce->active);
> +			return err;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void intel_context_active_release(struct intel_context *ce)
> +{
> +	/* Nodes preallocated in intel_context_active() */
> +	i915_active_acquire_barrier(&ce->active);
> +	i915_active_release(&ce->active);
> +}
> +
>  int __intel_context_do_pin(struct intel_context *ce)
>  {
>  	int err;
> @@ -79,11 +107,15 @@ int __intel_context_do_pin(struct intel_context *ce)
>  	if (likely(!atomic_read(&ce->pin_count))) {
>  		intel_wakeref_t wakeref;
>  
> +		err = intel_context_active_acquire(ce);
> +		if (unlikely(err))
> +			goto err;
> +
>  		err = 0;
>  		with_intel_runtime_pm(ce->engine->uncore->rpm, wakeref)
>  			err = ce->ops->pin(ce);
>  		if (err)
> -			goto err;
> +			goto err_active;
>  
>  		CE_TRACE(ce, "pin ring:{head:%04x, tail:%04x}\n",
>  			 ce->ring->head, ce->ring->tail);
> @@ -97,6 +129,8 @@ int __intel_context_do_pin(struct intel_context *ce)
>  	mutex_unlock(&ce->pin_mutex);
>  	return 0;
>  
> +err_active:
> +	intel_context_active_release(ce);
>  err:
>  	mutex_unlock(&ce->pin_mutex);
>  	return err;
> @@ -198,34 +232,6 @@ static int __intel_context_active(struct i915_active *active)
>  	return err;
>  }
>  
> -int intel_context_active_acquire(struct intel_context *ce)
> -{
> -	int err;
> -
> -	err = i915_active_acquire(&ce->active);
> -	if (err)
> -		return err;
> -
> -	/* Preallocate tracking nodes */
> -	if (!intel_context_is_barrier(ce)) {
> -		err = i915_active_acquire_preallocate_barrier(&ce->active,
> -							      ce->engine);
> -		if (err) {
> -			i915_active_release(&ce->active);
> -			return err;
> -		}
> -	}
> -
> -	return 0;
> -}
> -
> -void intel_context_active_release(struct intel_context *ce)
> -{
> -	/* Nodes preallocated in intel_context_active() */
> -	i915_active_acquire_barrier(&ce->active);
> -	i915_active_release(&ce->active);
> -}
> -
>  void
>  intel_context_init(struct intel_context *ce,
>  		   struct intel_engine_cs *engine)
> diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
> index 673f5fb2967a..f0f49b50b968 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context.h
> +++ b/drivers/gpu/drm/i915/gt/intel_context.h
> @@ -118,9 +118,6 @@ static inline void intel_context_exit(struct intel_context *ce)
>  		ce->ops->exit(ce);
>  }
>  
> -int intel_context_active_acquire(struct intel_context *ce);
> -void intel_context_active_release(struct intel_context *ce);
> -
>  static inline struct intel_context *intel_context_get(struct intel_context *ce)
>  {
>  	kref_get(&ce->ref);
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index bd74b76c6403..28b1fbcb4370 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -2566,33 +2566,21 @@ __execlists_context_pin(struct intel_context *ce,
>  			struct intel_engine_cs *engine)
>  {
>  	void *vaddr;
> -	int ret;
>  
>  	GEM_BUG_ON(!ce->state);
> -
> -	ret = intel_context_active_acquire(ce);
> -	if (ret)
> -		goto err;
>  	GEM_BUG_ON(!i915_vma_is_pinned(ce->state));
>  
>  	vaddr = i915_gem_object_pin_map(ce->state->obj,
>  					i915_coherent_map_type(engine->i915) |
>  					I915_MAP_OVERRIDE);
> -	if (IS_ERR(vaddr)) {
> -		ret = PTR_ERR(vaddr);
> -		goto unpin_active;
> -	}
> +	if (IS_ERR(vaddr))
> +		return PTR_ERR(vaddr);
>  
>  	ce->lrc_desc = lrc_descriptor(ce, engine) | CTX_DESC_FORCE_RESTORE;
>  	ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
>  	__execlists_update_reg_state(ce, engine);
>  
>  	return 0;
> -
> -unpin_active:
> -	intel_context_active_release(ce);
> -err:
> -	return ret;
>  }
>  
>  static int execlists_context_pin(struct intel_context *ce)
> diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> index eca5ab048cd9..bc44fe8e5ffa 100644
> --- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> +++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> @@ -1329,21 +1329,7 @@ static int ring_context_alloc(struct intel_context *ce)
>  
>  static int ring_context_pin(struct intel_context *ce)
>  {
> -	int err;
> -
> -	err = intel_context_active_acquire(ce);
> -	if (err)
> -		return err;
> -
> -	err = __context_pin_ppgtt(ce);
> -	if (err)
> -		goto err_active;
> -
> -	return 0;
> -
> -err_active:
> -	intel_context_active_release(ce);
> -	return err;
> +	return __context_pin_ppgtt(ce);
>  }
>  
>  static void ring_context_reset(struct intel_context *ce)
> diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> index d0e68ce9aa51..a560b7eee2cd 100644
> --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> @@ -149,7 +149,7 @@ static int mock_context_alloc(struct intel_context *ce)
>  
>  static int mock_context_pin(struct intel_context *ce)
>  {
> -	return intel_context_active_acquire(ce);
> +	return 0;
>  }
>  
>  static void mock_context_reset(struct intel_context *ce)