* updates before
* the counter increment.
*/
- smp_mb__before_atomic_inc();
+ smp_mb__before_atomic();
atomic_inc(&dev_priv->gpu_error.reset_counter);
kobject_uevent_env(&dev->primary->kdev->kobj,
struct intel_engine_cs *signaller;
u32 seqno, ctl;
- ring->hangcheck.deadlock = true;
+ ring->hangcheck.deadlock++;
signaller = semaphore_waits_for(ring, &seqno);
- if (signaller == NULL || signaller->hangcheck.deadlock)
+ if (signaller == NULL)
+ return -1;
+
+ /* Prevent pathological recursion due to driver bugs */
+ if (signaller->hangcheck.deadlock >= I915_NUM_RINGS)
return -1;
/* cursory check for an unkickable deadlock */
if (ctl & RING_WAIT_SEMAPHORE && semaphore_passed(signaller) < 0)
return -1;
- return i915_seqno_passed(signaller->get_seqno(signaller, false), seqno);
+ if (i915_seqno_passed(signaller->get_seqno(signaller, false), seqno))
+ return 1;
+
+ if (signaller->hangcheck.deadlock)
+ return -1;
+
+ return 0;
}
static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
int i;
for_each_ring(ring, dev_priv, i)
- ring->hangcheck.deadlock = false;
+ ring->hangcheck.deadlock = 0;
}
static enum intel_ring_hangcheck_action