From 339ccd35b42cb679b1a218fdbac4c029058c671c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 15 Feb 2018 16:25:53 +0000 Subject: [PATCH] drm/i915: Assert that we always complete a submission to guc/execlists MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Cc: Michał Winiarski Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180215162553.23348-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_guc_submission.c | 6 ++++++ drivers/gpu/drm/i915/intel_lrc.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c index b43b58cc599b..946766b62459 100644 --- a/drivers/gpu/drm/i915/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/intel_guc_submission.c @@ -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); } diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index c2c8380a0121..6fbe1a8a37ad 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -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); -- 2.11.0