drm/i915/guc: Add extra debug on CT deadlock
Print CT state (H2G + G2H head / tail pointers, credits) on CT
deadlock.
v2:
(John Harrison)
- Add units to debug messages
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211214170500.28569-6-matthew.brost@intel.com
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 a0cc34b..741be9a 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 (Bytes)\n",
+ atomic_read(&ct->ctbs.send.space) * 4);
+ CT_ERROR(ct, "Head: %u (Dwords)\n", ct->ctbs.send.desc->head);
+ CT_ERROR(ct, "Tail: %u (Dwords)\n", ct->ctbs.send.desc->tail);
+ CT_ERROR(ct, "G2H Space: %u (Bytes)\n",
+ atomic_read(&ct->ctbs.recv.space) * 4);
+ CT_ERROR(ct, "Head: %u\n (Dwords)", ct->ctbs.recv.desc->head);
+ CT_ERROR(ct, "Tail: %u\n (Dwords)", ct->ctbs.recv.desc->tail);
+
ct->ctbs.send.broken = true;
}