On Fri, Dec 10, 2021 at 05:45:05PM -0800, John Harrison wrote: > On 12/10/2021 17:43, John Harrison wrote: > > 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.brost@xxxxxxxxx> > > Reviewed-by: John Harrison <John.C.Harrison@xxxxxxxxx> > > > > > --- > > > 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); > Actually, aren't these offsets in dwords? So, scaling the dword space to > bytes but leaving this as dwords would produce a confusing numbers. > Copy + pasted from CT debugfs but yes it is slightly confusing. I'd rather leave the head / tail in native format but I'll add info to both the space / pointers print indicating the units. Matt > John. > > > > + 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; > > > } > > >
