[Intel-gfx] [PATCH 18/21] drm/i915: Combined gt.awake/gt.power wakerefs

[Mika Kuoppala]

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

> As the GT_IRQ power domain implies a wakeref, we can use it inplace of
> our existing redundant rpm grab.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Jani Nikula <jani.nikula at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h                  |  1 -
>  drivers/gpu/drm/i915/i915_gem.c                  | 11 ++++-------
>  drivers/gpu/drm/i915/intel_lrc.c                 |  2 +-
>  drivers/gpu/drm/i915/selftests/mock_gem_device.c |  1 +
>  4 files changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 259b91b62ff2..25941c649282 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1985,7 +1985,6 @@ struct drm_i915_private {
>  		 * is a slight delay before we do so.
>  		 */
>  		intel_wakeref_t awake;
> -		intel_wakeref_t power;
>  
>  		/**
>  		 * The number of times we have woken up.
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 5ed1c8576525..0bfed33178e1 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -176,9 +176,7 @@ static u32 __i915_gem_park(struct drm_i915_private *i915)
>  	if (INTEL_GEN(i915) >= 6)
>  		gen6_rps_idle(i915);
>  
> -	intel_display_power_put(i915, POWER_DOMAIN_GT_IRQ, i915->gt.power);
> -
> -	intel_runtime_pm_put(i915, wakeref);
> +	intel_display_power_put(i915, POWER_DOMAIN_GT_IRQ, wakeref);
>  
>  	return i915->gt.epoch;
>  }
> @@ -203,13 +201,11 @@ void i915_gem_unpark(struct drm_i915_private *i915)
>  
>  	lockdep_assert_held(&i915->drm.struct_mutex);
>  	GEM_BUG_ON(!i915->gt.active_requests);
> +	assert_rpm_wakelock_held(i915);
>  
>  	if (i915->gt.awake)
>  		return;
>  
> -	i915->gt.awake = intel_runtime_pm_get_noresume(i915);
> -	GEM_BUG_ON(!i915->gt.awake);
> -
>  	/*
>  	 * It seems that the DMC likes to transition between the DC states a lot
>  	 * when there are no connected displays (no active power domains) during
> @@ -221,7 +217,8 @@ void i915_gem_unpark(struct drm_i915_private *i915)
>  	 * Work around it by grabbing a GT IRQ power domain whilst there is any
>  	 * GT activity, preventing any DC state transitions.
>  	 */
> -	i915->gt.power = intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ);
> +	i915->gt.awake = intel_display_power_get(i915, POWER_DOMAIN_GT_IRQ);
> +	GEM_BUG_ON(!i915->gt.awake);
>  
>  	if (unlikely(++i915->gt.epoch == 0)) /* keep 0 as invalid */
>  		i915->gt.epoch = 1;
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 1effbf49fa08..608458b92db3 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1045,7 +1045,7 @@ static void execlists_submission_tasklet(unsigned long data)
>  
>  	GEM_TRACE("%s awake?=%d, active=%x\n",
>  		  engine->name,
> -		  engine->i915->gt.awake,
> +		  !!engine->i915->gt.awake,
>  		  engine->execlists.active);
>  
>  	spin_lock_irqsave(&engine->timeline.lock, flags);
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> index 082809569681..2c55e0fa64c9 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> @@ -164,6 +164,7 @@ struct drm_i915_private *mock_gem_device(void)
>  	pm_runtime_dont_use_autosuspend(&pdev->dev);
>  	if (pm_runtime_enabled(&pdev->dev))
>  		WARN_ON(pm_runtime_get_sync(&pdev->dev));
> +	disable_rpm_wakeref_asserts(i915);
>

With this seemingly unwarranted disable removed,
Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

>  	err = drm_dev_init(&i915->drm, &mock_driver, &pdev->dev);
>  	if (err) {
> -- 
> 2.20.1