drm/i915: Reset the hangcheck timestamp before repeating a seqno

In the unusual circumstance where we reuse a seqno (for example, in
igt), make sure that we reset the hangcheck timestamp before it sees the
same seqno again.

References: https://bugs.freedesktop.org/show_bug.cgi?id=106215
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502220313.6459-1-chris@chris-wilson.co.uk

2 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 5acf869f3ca3..63bb61089be5 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -223,6 +223,7 @@ static int reset_all_global_seqno(struct drm_i915_private *i915, u32 seqno)
                 if (!i915_seqno_passed(seqno, engine->timeline.seqno)) {
                         /* Flush any waiters before we reuse the seqno */
                         intel_engine_disarm_breadcrumbs(engine);
+                        intel_engine_init_hangcheck(engine);
                         GEM_BUG_ON(!list_empty(&engine->breadcrumbs.signals));
                 }
 
diff --git a/drivers/gpu/drm/i915/intel_hangcheck.c b/drivers/gpu/drm/i915/intel_hangcheck.c
index 309e38b00e95..d47e346bd49e 100644
--- a/drivers/gpu/drm/i915/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/intel_hangcheck.c
@@ -452,6 +452,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
 void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
 {
         memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
+        engine->hangcheck.action_timestamp = jiffies;
 }
 
 void intel_hangcheck_init(struct drm_i915_private *i915)