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drm/i915: Assert that we always complete a submission to guc/execlists

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The continual resubmission model for execlists (and emulated over guc)
requires that we keep feeding requests into the HW in order to generate
more CS interrupts to drain the rest of the queue. Add a couple of
asserts to ensure that we don't skip a cycle and come to a grinding
halt.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180215162553.23348-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-02-15 16:25:53 +00:00
parent c0a51fd07b
commit 339ccd35b4
2 changed files with 12 additions and 0 deletions
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6
drivers/gpu/drm/i915/intel_guc_submission.c
View file

@ -747,6 +747,12 @@ done:
execlists_set_active(execlists, EXECLISTS_ACTIVE_USER);
guc_submit(engine);
}
/* We must always keep the beast fed if we have work piled up */
GEM_BUG_ON(port_isset(execlists->port) &&
!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
GEM_BUG_ON(execlists->first && !port_isset(execlists->port));
unlock:
spin_unlock_irq(&engine->timeline->lock);
}

6
drivers/gpu/drm/i915/intel_lrc.c
View file

@ -642,6 +642,12 @@ done:
execlists->first = rb;
if (submit)
port_assign(port, last);
/* We must always keep the beast fed if we have work piled up */
GEM_BUG_ON(port_isset(execlists->port) &&
!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
GEM_BUG_ON(execlists->first && !port_isset(execlists->port));
unlock:
spin_unlock_irq(&engine->timeline->lock);