[Intel-gfx] [PATCH 18/27] drm/i915: Only reset hangcheck at the start of an activity cycle

[Chris Wilson]

Across a reset, the seqno (and thus hangcheck) should restart and the
hangcheck naturally progress, for when it does not, we want to declare an
emergency. Currently, we only detect if reset and reinit fails, but we
do not detect if the call to reinit succeeds but the HW is fried - as we
are resetting hangcheck on initialisation the engine. Remove that and
rely on the natural progress to reset the hangcheck timer.

References: e21b141376f9 ("drm/i915: Mark the hangcheck as idle when unparking the engines")
References: 1fd00c0faeec ("drm/i915: Declare the driver wedged if hangcheck makes no progress")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c        | 1 -
 drivers/gpu/drm/i915/intel_ringbuffer.c | 2 --
 2 files changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ab89dabc2965..933495996e91 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1852,7 +1852,6 @@ static int gen8_init_common_ring(struct intel_engine_cs *engine)
 		return ret;
 
 	intel_engine_reset_breadcrumbs(engine);
-	intel_engine_init_hangcheck(engine);
 
 	if (GEM_SHOW_DEBUG() && unexpected_starting_state(engine)) {
 		struct drm_printer p = drm_debug_printer(__func__);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 700f94c371b3..f4bd185c9369 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -524,8 +524,6 @@ static int init_ring_common(struct intel_engine_cs *engine)
 		goto out;
 	}
 
-	intel_engine_init_hangcheck(engine);
-
 	if (INTEL_GEN(dev_priv) > 2)
 		I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));
 
-- 
2.18.0