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drm/i915/execlists: Track active elements during dequeue

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Record the initial active element we use when building the next ELSP
submission, so that we can compare against it latter to see if there's
no change.

Fixes: 44d0a9c05b ("drm/i915/execlists: Skip redundant resubmission")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200311092624.10012-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-03-11 09:26:23 +00:00
parent 408464b4cb
commit 60ef5b7ac6
1 changed files with 12 additions and 20 deletions
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32
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -1678,17 +1678,6 @@ static void virtual_xfer_breadcrumbs(struct virtual_engine *ve,
spin_unlock(&old->breadcrumbs.irq_lock);
}
static struct i915_request *
last_active(const struct intel_engine_execlists *execlists)
{
struct i915_request * const *last = READ_ONCE(execlists->active);
while (*last && i915_request_completed(*last))
last++;
return *last;
}
#define for_each_waiter(p__, rq__) \
list_for_each_entry_lockless(p__, \
&(rq__)->sched.waiters_list, \
@ -1827,11 +1816,9 @@ static void record_preemption(struct intel_engine_execlists *execlists)
(void)I915_SELFTEST_ONLY(execlists->preempt_hang.count++);
}
static unsigned long active_preempt_timeout(struct intel_engine_cs *engine)
static unsigned long active_preempt_timeout(struct intel_engine_cs *engine,
const struct i915_request *rq)
{
struct i915_request *rq;
rq = last_active(&engine->execlists);
if (!rq)
return 0;
@ -1842,13 +1829,14 @@ static unsigned long active_preempt_timeout(struct intel_engine_cs *engine)
return READ_ONCE(engine->props.preempt_timeout_ms);
}
static void set_preempt_timeout(struct intel_engine_cs *engine)
static void set_preempt_timeout(struct intel_engine_cs *engine,
const struct i915_request *rq)
{
if (!intel_engine_has_preempt_reset(engine))
return;
set_timer_ms(&engine->execlists.preempt,
active_preempt_timeout(engine));
active_preempt_timeout(engine, rq));
}
static inline void clear_ports(struct i915_request **ports, int count)
@ -1861,6 +1849,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
struct intel_engine_execlists * const execlists = &engine->execlists;
struct i915_request **port = execlists->pending;
struct i915_request ** const last_port = port + execlists->port_mask;
struct i915_request * const *active;
struct i915_request *last;
struct rb_node *rb;
bool submit = false;
@ -1915,7 +1904,10 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
* i.e. we will retrigger preemption following the ack in case
* of trouble.
*/
last = last_active(execlists);
active = READ_ONCE(execlists->active);
while ((last = *active) && i915_request_completed(last))
active++;
if (last) {
if (need_preempt(engine, last, rb)) {
ENGINE_TRACE(engine,
@ -2201,7 +2193,7 @@ done:
* Skip if we ended up with exactly the same set of requests,
* e.g. trying to timeslice a pair of ordered contexts
*/
if (!memcmp(execlists->active, execlists->pending,
if (!memcmp(active, execlists->pending,
(port - execlists->pending + 1) * sizeof(*port))) {
do
execlists_schedule_out(fetch_and_zero(port));
@ -2212,7 +2204,7 @@ done:
clear_ports(port + 1, last_port - port);
execlists_submit_ports(engine);
set_preempt_timeout(engine);
set_preempt_timeout(engine, *active);
} else {
skip_submit:
ring_set_paused(engine, 0);