[Intel-gfx] [PATCH 05/14] drm/i915: Remove delay for idle_work

[Tvrtko Ursulin]

On 02/05/2019 14:22, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2019-05-02 14:19:38)
>>
>> On 01/05/2019 12:45, Chris Wilson wrote:
>>> diff --git a/drivers/gpu/drm/i915/i915_gem_pm.c b/drivers/gpu/drm/i915/i915_gem_pm.c
>>> index 49b0ce594f20..ae91ad7cb31e 100644
>>> --- a/drivers/gpu/drm/i915/i915_gem_pm.c
>>> +++ b/drivers/gpu/drm/i915/i915_gem_pm.c
>>> @@ -29,12 +29,12 @@ static void i915_gem_park(struct drm_i915_private *i915)
>>>    static void idle_work_handler(struct work_struct *work)
>>>    {
>>>        struct drm_i915_private *i915 =
>>> -             container_of(work, typeof(*i915), gem.idle_work.work);
>>> +             container_of(work, typeof(*i915), gem.idle_work);
>>>    
>>>        mutex_lock(&i915->drm.struct_mutex);
>>>    
>>>        intel_wakeref_lock(&i915->gt.wakeref);
>>> -     if (!intel_wakeref_active(&i915->gt.wakeref))
>>> +     if (!intel_wakeref_active(&i915->gt.wakeref) && !work_pending(work))
>>
>> What is the reason for the !work_pending check?
> 
> Just that we are going to be called again, so wait until the next time to
> see if we still need to park.

When does it get called again? If a whole new cycle of unpark-park 
happened before the previous park was able to finish?

Regards,

Tvrtko