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drm/i915: Keep track of request among the scheduling lists

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If we keep track of when the i915_request.sched.link is on the HW
runlist, or in the priority queue we can simplify our interactions with
the request (such as during rescheduling). This also simplifies the next
patch where we introduce a new in-between list, for requests that are
ready but neither on the run list or in the queue.

v2: Update i915_sched_node.link explanation for current usage where it
is a link on both the queue and on the runlists.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200116184754.2860848-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-01-16 18:47:52 +00:00
parent 9e83713a72
commit 672c368f93
4 changed files with 38 additions and 18 deletions
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17
drivers/gpu/drm/i915/i915_request.h
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@@ -70,6 +70,18 @@ enum {
*/
I915_FENCE_FLAG_ACTIVE = DMA_FENCE_FLAG_USER_BITS,
/*
* I915_FENCE_FLAG_PQUEUE - this request is ready for execution
*
* Using the scheduler, when a request is ready for execution it is put
* into the priority queue, and removed from that queue when transferred
* to the HW runlists. We want to track its membership within the
* priority queue so that we can easily check before rescheduling.
*
* See i915_request_in_priority_queue()
*/
I915_FENCE_FLAG_PQUEUE,
/*
* I915_FENCE_FLAG_SIGNAL - this request is currently on signal_list
*
@@ -361,6 +373,11 @@ static inline bool i915_request_is_active(const struct i915_request *rq)
return test_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags);
}
static inline bool i915_request_in_priority_queue(const struct i915_request *rq)
{
return test_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
}
/**
* Returns true if seq1 is later than seq2.
*/