From 546cdbc75b6a1cba6445896141c736b0a3070afc Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 21 Apr 2017 09:31:13 +0100 Subject: [PATCH] drm/i915: Stop touching hangcheck.seqno from intel_engine_init_global_seqno() The hangcheck runs independently to the main flow of seqno through the driver. However, we have an odd coupling of the seqno reset that is unwelcome, and if poked at just the right rate can cause spurious hangs (e.g. gem_exec_whisper) on an apparently idle engine. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/20170421083113.21321-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_engine_cs.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 402769d9d840..82a274b336c5 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -265,6 +265,7 @@ void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno) struct drm_i915_private *dev_priv = engine->i915; GEM_BUG_ON(!intel_engine_is_idle(engine)); + GEM_BUG_ON(i915_gem_active_isset(&engine->timeline->last_request)); /* Our semaphore implementation is strictly monotonic (i.e. we proceed * so long as the semaphore value in the register/page is greater @@ -296,9 +297,6 @@ void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno) intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno); clear_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted); - GEM_BUG_ON(i915_gem_active_isset(&engine->timeline->last_request)); - engine->hangcheck.seqno = seqno; - /* After manually advancing the seqno, fake the interrupt in case * there are any waiters for that seqno. */ -- 2.20.1