[Intel-gfx] [PATCH 3/3] drm/i915: Treat weak-dependencies as bidirectional when applying priorities

[Tvrtko Ursulin]

On 07/05/2020 09:21, Chris Wilson wrote:
> Clients may use a submit-fence as bidirectional bond between two or more
> co-operating requests, and so if we bump the priority of one, we wish to
> bump the priority of the set.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_scheduler.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
> index 6e2d4190099f..7194fbfcaa49 100644
> --- a/drivers/gpu/drm/i915/i915_scheduler.c
> +++ b/drivers/gpu/drm/i915/i915_scheduler.c
> @@ -291,6 +291,12 @@ static void __i915_schedule(struct i915_sched_node *node,
>   			if (prio > READ_ONCE(p->signaler->attr.priority))
>   				list_move_tail(&p->dfs_link, &dfs);
>   		}
> +
> +		list_for_each_entry(p, &node->waiters_list, wait_link) {
> +			if (p->flags & I915_DEPENDENCY_WEAK &&
> +			    prio > READ_ONCE(p->waiter->attr.priority))
> +				list_move_tail(&p->dfs_link, &dfs);
> +		}
>   	}
>   
>   	/*
> 

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

Regards,

Tvrtko