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drm/i915/gt: Move the breadcrumb to the signaler if completed upon cancel

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If while we are cancelling the breadcrumb signaling, we find that the
request is already completed, move it to the irq signaler and let it be
signaled.

v2: Tweak reference counting so that we only acquire a new reference on
adding to a signal list, as opposed to a hidden i915_request_put of the
caller's reference.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201126140407.31952-5-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-11-26 14:04:07 +00:00
parent c744d50363
commit 85cc2917a3
1 changed files with 22 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
View file

@ -192,18 +192,6 @@ static void add_retire(struct intel_breadcrumbs *b, struct intel_timeline *tl)
intel_engine_add_retire(b->irq_engine, tl);
}
static bool __signal_request(struct i915_request *rq)
{
GEM_BUG_ON(test_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags));
if (!__dma_fence_signal(&rq->fence)) {
i915_request_put(rq);
return false;
}
return true;
}
static struct llist_node *
slist_add(struct llist_node *node, struct llist_node *head)
{
@ -274,9 +262,11 @@ static void signal_irq_work(struct irq_work *work)
release = remove_signaling_context(b, ce);
spin_unlock(&ce->signal_lock);
if (__signal_request(rq))
if (__dma_fence_signal(&rq->fence))
/* We own signal_node now, xfer to local list */
signal = slist_add(&rq->signal_node, signal);
else
i915_request_put(rq);
if (release) {
add_retire(b, ce->timeline);
@ -363,6 +353,17 @@ void intel_breadcrumbs_free(struct intel_breadcrumbs *b)
kfree(b);
}
static void irq_signal_request(struct i915_request *rq,
struct intel_breadcrumbs *b)
{
if (!__dma_fence_signal(&rq->fence))
return;
i915_request_get(rq);
if (llist_add(&rq->signal_node, &b->signaled_requests))
irq_work_queue(&b->irq_work);
}
static void insert_breadcrumb(struct i915_request *rq)
{
struct intel_breadcrumbs *b = READ_ONCE(rq->engine)->breadcrumbs;
@ -372,17 +373,13 @@ static void insert_breadcrumb(struct i915_request *rq)
if (test_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags))
return;
i915_request_get(rq);
/*
* If the request is already completed, we can transfer it
* straight onto a signaled list, and queue the irq worker for
* its signal completion.
*/
if (__request_completed(rq)) {
if (__signal_request(rq) &&
llist_add(&rq->signal_node, &b->signaled_requests))
irq_work_queue(&b->irq_work);
irq_signal_request(rq, b);
return;
}
@ -413,6 +410,8 @@ static void insert_breadcrumb(struct i915_request *rq)
break;
}
}
i915_request_get(rq);
list_add_rcu(&rq->signal_link, pos);
GEM_BUG_ON(!check_signal_order(ce, rq));
GEM_BUG_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &rq->fence.flags));
@ -453,6 +452,7 @@ bool i915_request_enable_breadcrumb(struct i915_request *rq)
void i915_request_cancel_breadcrumb(struct i915_request *rq)
{
struct intel_breadcrumbs *b = READ_ONCE(rq->engine)->breadcrumbs;
struct intel_context *ce = rq->context;
bool release;
@ -461,11 +461,14 @@ void i915_request_cancel_breadcrumb(struct i915_request *rq)
spin_lock(&ce->signal_lock);
list_del_rcu(&rq->signal_link);
release = remove_signaling_context(rq->engine->breadcrumbs, ce);
release = remove_signaling_context(b, ce);
spin_unlock(&ce->signal_lock);
if (release)
intel_context_put(ce);
if (__request_completed(rq))
irq_signal_request(rq, b);
i915_request_put(rq);
}