Re: [Intel-gfx] [PATCH 5/7] drm/i915/guc: Add extra debug on CT deadlock

[John Harrison]

On 12/10/2021 16:56, Matthew Brost wrote:

Print CT state (H2G + G2H head / tail pointers, credits) on CT
deadlock.

Signed-off-by: Matthew Brost <matthew.br...@intel.com>

Reviewed-by: John Harrison <john.c.harri...@intel.com>

---
  drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c 
b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
index a0cc34be7b56..ee5525c6f79b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -523,6 +523,15 @@ static inline bool ct_deadlocked(struct intel_guc_ct *ct)
                CT_ERROR(ct, "Communication stalled for %lld ms, desc 
status=%#x,%#x\n",
                         ktime_ms_delta(ktime_get(), ct->stall_time),
                         send->status, recv->status);
+               CT_ERROR(ct, "H2G Space: %u\n",
+                        atomic_read(&ct->ctbs.send.space) * 4);
+               CT_ERROR(ct, "Head: %u\n", ct->ctbs.send.desc->head);
+               CT_ERROR(ct, "Tail: %u\n", ct->ctbs.send.desc->tail);
+               CT_ERROR(ct, "G2H Space: %u\n",
+                        atomic_read(&ct->ctbs.recv.space) * 4);
+               CT_ERROR(ct, "Head: %u\n", ct->ctbs.recv.desc->head);
+               CT_ERROR(ct, "Tail: %u\n", ct->ctbs.recv.desc->tail);
+
                ct->ctbs.send.broken = true;
        }