[Bug 105888] [CNL] System hang when running piglit.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105888

--- Comment #3 from Rafael Antognolli <rafael.antognolli at intel.com> ---
Cool, I'll give this a try.

Paulo also suggested disabling some individual GEM_TRACE messages, and it looks
like this brings the hang back:

diff --git a/drivers/gpu/drm/i915/intel_lrc.c
b/drivers/gpu/drm/i915/intel_lrc.c                           
index f60b61bf8b3b..37365ec55e63 100644                                         
--- a/drivers/gpu/drm/i915/intel_lrc.c         
+++ b/drivers/gpu/drm/i915/intel_lrc.c               
@@ -927,10 +927,10 @@ static void execlists_submission_tasklet(unsigned long
data)
                        head = execlists->csb_head;                             
                        tail = READ_ONCE(buf[write_idx]);
                }                                        
-               GEM_TRACE("%s cs-irq head=%d [%d%s], tail=%d [%d%s]\n",
-                         engine->name,                                
-                         head, GEN8_CSB_READ_PTR(readl(dev_priv->regs +
i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)))), fw ? "" : "?",
-                         tail, GEN8_CSB_WRITE_PTR(readl(dev_priv->regs +
i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)))), fw ? "" : "?");
+               /* GEM_TRACE("%s cs-irq head=%d [%d%s], tail=%d [%d%s]\n", */   
+               /*        engine->name, */                                   
+               /*        head, GEN8_CSB_READ_PTR(readl(dev_priv->regs +
i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)))), fw ? "" : "?", */
+               /*        tail, GEN8_CSB_WRITE_PTR(readl(dev_priv->regs +
i915_mmio_reg_offset(RING_CONTEXT_STATUS_PTR(engine)))), fw ? "" : "?"); */

                while (head != tail) {                                          
                        struct i915_request *rq;


I'll test your suggestion and report back (might only have results by tomorrow,
since some times it takes a while to reproduce it).

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