redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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

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
hifive-unleashed-5.1
Chris Wilson 2018-06-28 21:12:04 +01:00
parent 74093f3ecc
commit 0b02befa82
1 changed files with 12 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -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 @@ done:
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 @@ done:
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,