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drm/i915/execlists: Pull submit after dequeue under timeline lock

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In the next patch, we will begin processing the CSB from inside the
submission path (underneath an irqsoff section, and even from inside
interrupt handlers). This means that updating the execlists->port[] will
no longer be serialised by the tasklet but needs to be locked by the
engine->timeline.lock instead. Pull dequeue and submit under the same
lock for protection. (An alternate future plan is to keep the in/out
arrays separate for concurrent processing and reduced lock coverage.)

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/20180628201211.13837-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-28 21:12:04 +01:00
parent 74093f3ecc
commit 0b02befa82
1 changed files with 12 additions and 20 deletions
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32
drivers/gpu/drm/i915/intel_lrc.c
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@ -567,7 +567,7 @@ static void complete_preempt_context(struct intel_engine_execlists *execlists)
execlists_clear_active(execlists, EXECLISTS_ACTIVE_PREEMPT);
}
static bool __execlists_dequeue(struct intel_engine_cs *engine)
static void __execlists_dequeue(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
struct execlist_port *port = execlists->port;
@ -622,11 +622,11 @@ static bool __execlists_dequeue(struct intel_engine_cs *engine)
* the HW to indicate that it has had a chance to respond.
*/
if (!execlists_is_active(execlists, EXECLISTS_ACTIVE_HWACK))
return false;
return;
if (need_preempt(engine, last, execlists->queue_priority)) {
inject_preempt_context(engine);
return false;
return;
}
/*
@ -651,7 +651,7 @@ static bool __execlists_dequeue(struct intel_engine_cs *engine)
* priorities of the ports haven't been switch.
*/
if (port_count(&port[1]))
return false;
return;
/*
* WaIdleLiteRestore:bdw,skl
@ -751,8 +751,10 @@ static bool __execlists_dequeue(struct intel_engine_cs *engine)
port != execlists->port ? rq_prio(last) : INT_MIN;
execlists->first = rb;
if (submit)
if (submit) {
port_assign(port, last);
execlists_submit_ports(engine);
}
/* We must always keep the beast fed if we have work piled up */
GEM_BUG_ON(execlists->first && !port_isset(execlists->port));
@ -761,24 +763,19 @@ static bool __execlists_dequeue(struct intel_engine_cs *engine)
if (last)
execlists_user_begin(execlists, execlists->port);
return submit;
/* If the engine is now idle, so should be the flag; and vice versa. */
GEM_BUG_ON(execlists_is_active(&engine->execlists,
EXECLISTS_ACTIVE_USER) ==
!port_isset(engine->execlists.port));
}
static void execlists_dequeue(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
unsigned long flags;
bool submit;
spin_lock_irqsave(&engine->timeline.lock, flags);
submit = __execlists_dequeue(engine);
__execlists_dequeue(engine);
spin_unlock_irqrestore(&engine->timeline.lock, flags);
if (submit)
execlists_submit_ports(engine);
GEM_BUG_ON(port_isset(execlists->port) &&
!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
}
void
@ -1162,11 +1159,6 @@ static void execlists_submission_tasklet(unsigned long data)
if (!execlists_is_active(&engine->execlists, EXECLISTS_ACTIVE_PREEMPT))
execlists_dequeue(engine);
/* If the engine is now idle, so should be the flag; and vice versa. */
GEM_BUG_ON(execlists_is_active(&engine->execlists,
EXECLISTS_ACTIVE_USER) ==
!port_isset(engine->execlists.port));
}
static void queue_request(struct intel_engine_cs *engine,