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drm/i915: Only disable execlist preemption for the duration of the request

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We need to prevent resubmission of the context immediately following an
initial resubmit (which does a lite-restore preemption). Currently we do
this by disabling all submission whilst the context is still active, but
we can improve this by limiting the restriction to only until we
receive notification from the context-switch interrupt that the
lite-restore preemption is complete.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170124110009.28947-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2017-01-24 11:00:03 +00:00
parent c816e605ff
commit 816ee798ec
3 changed files with 16 additions and 17 deletions
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18
drivers/gpu/drm/i915/i915_debugfs.c
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@@ -3320,15 +3320,21 @@ static int i915_engine_info(struct seq_file *m, void *unused)
rcu_read_lock();
rq = READ_ONCE(engine->execlist_port[0].request);
if (rq)
print_request(m, rq, "\t\tELSP[0] ");
else
if (rq) {
seq_printf(m, "\t\tELSP[0] count=%d, ",
engine->execlist_port[0].count);
print_request(m, rq, "rq: ");
} else {
seq_printf(m, "\t\tELSP[0] idle\n");
}
rq = READ_ONCE(engine->execlist_port[1].request);
if (rq)
print_request(m, rq, "\t\tELSP[1] ");
else
if (rq) {
seq_printf(m, "\t\tELSP[1] count=%d, ",
engine->execlist_port[1].count);
print_request(m, rq, "rq: ");
} else {
seq_printf(m, "\t\tELSP[1] idle\n");
}
rcu_read_unlock();
spin_lock_irq(&engine->timeline->lock);