Re: [PATCH 1/2] drm/i915: Lift i915_vma_parked() onto the gt

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 21/10/2019 19:32, Chris Wilson wrote:
> Currently even though i915_vma_parked() operates on a per-gt struct, it
> is called from a global pm notify. This oddity was only because the long
> term plan is to decouple the vma cache from the pm notification, but
> right now the oddity stands out like a sore thumb!
> 
> Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> ---
>   drivers/gpu/drm/i915/gem/i915_gem_pm.c |  1 -
>   drivers/gpu/drm/i915/gt/intel_gt_pm.c  |  1 +
>   drivers/gpu/drm/i915/i915_vma.c        | 32 +++++++++++++-------------
>   drivers/gpu/drm/i915/i915_vma.h        |  2 +-
>   4 files changed, 18 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
> index 7987b54fb1f5..2aa7e9be088f 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
> @@ -23,7 +23,6 @@ static int pm_notifier(struct notifier_block *nb,
>   		break;
>   
>   	case INTEL_GT_PARK:
> -		i915_vma_parked(i915);
>   		break;
>   	}
>   
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> index b866d5b1eee0..fde5112b6650 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
> @@ -71,6 +71,7 @@ static int __gt_park(struct intel_wakeref *wf)
>   	pm_notify(gt, INTEL_GT_PARK);
>   	intel_gt_park_requests(gt);
>   
> +	i915_vma_parked(gt);
>   	i915_pmu_gt_parked(i915);
>   	if (INTEL_GEN(i915) >= 6)
>   		gen6_rps_idle(i915);
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index e90c4d0af8fd..d733bcf262f0 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -106,7 +106,7 @@ vma_create(struct drm_i915_gem_object *obj,
>   	struct rb_node *rb, **p;
>   
>   	/* The aliasing_ppgtt should never be used directly! */
> -	GEM_BUG_ON(vm == &vm->i915->ggtt.alias->vm);
> +	GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm);
>   
>   	vma = i915_vma_alloc();
>   	if (vma == NULL)
> @@ -412,7 +412,7 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
>   	int err;
>   
>   	/* Access through the GTT requires the device to be awake. */
> -	assert_rpm_wakelock_held(&vma->vm->i915->runtime_pm);
> +	assert_rpm_wakelock_held(vma->vm->gt->uncore->rpm);
>   	if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
>   		err = -ENODEV;
>   		goto err;
> @@ -945,7 +945,7 @@ int i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
>   
>   void i915_vma_close(struct i915_vma *vma)
>   {
> -	struct drm_i915_private *i915 = vma->vm->i915;
> +	struct intel_gt *gt = vma->vm->gt;
>   	unsigned long flags;
>   
>   	GEM_BUG_ON(i915_vma_is_closed(vma));
> @@ -962,18 +962,18 @@ void i915_vma_close(struct i915_vma *vma)
>   	 * causing us to rebind the VMA once more. This ends up being a lot
>   	 * of wasted work for the steady state.
>   	 */
> -	spin_lock_irqsave(&i915->gt.closed_lock, flags);
> -	list_add(&vma->closed_link, &i915->gt.closed_vma);
> -	spin_unlock_irqrestore(&i915->gt.closed_lock, flags);
> +	spin_lock_irqsave(&gt->closed_lock, flags);
> +	list_add(&vma->closed_link, &gt->closed_vma);
> +	spin_unlock_irqrestore(&gt->closed_lock, flags);
>   }
>   
>   static void __i915_vma_remove_closed(struct i915_vma *vma)
>   {
> -	struct drm_i915_private *i915 = vma->vm->i915;
> +	struct intel_gt *gt = vma->vm->gt;
>   
> -	spin_lock_irq(&i915->gt.closed_lock);
> +	spin_lock_irq(&gt->closed_lock);
>   	list_del_init(&vma->closed_link);
> -	spin_unlock_irq(&i915->gt.closed_lock);
> +	spin_unlock_irq(&gt->closed_lock);
>   }
>   
>   void i915_vma_reopen(struct i915_vma *vma)
> @@ -1009,12 +1009,12 @@ void i915_vma_destroy(struct i915_vma *vma)
>   	i915_vma_free(vma);
>   }
>   
> -void i915_vma_parked(struct drm_i915_private *i915)
> +void i915_vma_parked(struct intel_gt *gt)
>   {
>   	struct i915_vma *vma, *next;
>   
> -	spin_lock_irq(&i915->gt.closed_lock);
> -	list_for_each_entry_safe(vma, next, &i915->gt.closed_vma, closed_link) {
> +	spin_lock_irq(&gt->closed_lock);
> +	list_for_each_entry_safe(vma, next, &gt->closed_vma, closed_link) {
>   		struct drm_i915_gem_object *obj = vma->obj;
>   		struct i915_address_space *vm = vma->vm;
>   
> @@ -1028,7 +1028,7 @@ void i915_vma_parked(struct drm_i915_private *i915)
>   			obj = NULL;
>   		}
>   
> -		spin_unlock_irq(&i915->gt.closed_lock);
> +		spin_unlock_irq(&gt->closed_lock);
>   
>   		if (obj) {
>   			i915_vma_destroy(vma);
> @@ -1038,11 +1038,11 @@ void i915_vma_parked(struct drm_i915_private *i915)
>   		i915_vm_close(vm);
>   
>   		/* Restart after dropping lock */
> -		spin_lock_irq(&i915->gt.closed_lock);
> -		next = list_first_entry(&i915->gt.closed_vma,
> +		spin_lock_irq(&gt->closed_lock);
> +		next = list_first_entry(&gt->closed_vma,
>   					typeof(*next), closed_link);
>   	}
> -	spin_unlock_irq(&i915->gt.closed_lock);
> +	spin_unlock_irq(&gt->closed_lock);
>   }
>   
>   static void __i915_vma_iounmap(struct i915_vma *vma)
> diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
> index 858908e3d1cc..465932813bc5 100644
> --- a/drivers/gpu/drm/i915/i915_vma.h
> +++ b/drivers/gpu/drm/i915/i915_vma.h
> @@ -462,7 +462,7 @@ i915_vma_unpin_fence(struct i915_vma *vma)
>   		__i915_vma_unpin_fence(vma);
>   }
>   
> -void i915_vma_parked(struct drm_i915_private *i915);
> +void i915_vma_parked(struct intel_gt *gt);
>   
>   #define for_each_until(cond) if (cond) break; else
>   
> 

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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