[Intel-gfx] [PATCH v2 2/3] drm/i915/userptr: Only flush the workqueue if required

[Tvrtko Ursulin]

On 07/03/2017 20:58, Chris Wilson wrote:
> To avoid waiting for work from other invalidate-range threads where
> not required, only wait on the userptr cancel workqueue if we have added
> some work to it.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Michał Winiarski <michal.winiarski at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_userptr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
> index 6ef05d5b884d..dc9bf5282071 100644
> --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
> @@ -145,7 +145,8 @@ static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier *_mn,
>  		del_object(mo);
>  	spin_unlock(&mn->lock);
>
> -	flush_workqueue(mn->wq);
> +	if (!list_empty(&cancelled))
> +		flush_workqueue(mn->wq);
>  }
>
>  static const struct mmu_notifier_ops i915_gem_userptr_notifier = {
>

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

Regards,

Tvrtko