drm/i915: Tidy up GEM_TRACE around execlists

Looking at the coordination of resets with the submission of execlists,
it will be useful to have a GEM_TRACE for when we issue the reset.
Whilst there tidy up the other GEM_TRACE to always include the engine
name, and be careful not to trust any pointers prior to asserts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171220090626.31643-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 6205d32..dc8dadd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -504,7 +504,7 @@ static void inject_preempt_context(struct intel_engine_cs *engine)
        ce->ring->tail &= (ce->ring->size - 1);
        ce->lrc_reg_state[CTX_RING_TAIL+1] = ce->ring->tail;
 
-       GEM_TRACE("\n");
+       GEM_TRACE("%s\n", engine->name);
        for (n = execlists_num_ports(&engine->execlists); --n; )
                elsp_write(0, engine->execlists.elsp);
 
@@ -906,7 +906,7 @@ static void execlists_submission_tasklet(unsigned long data)
                        GEM_TRACE("%s out[0]: ctx=%d.%d, seqno=%x\n",
                                  engine->name,
                                  port->context_id, count,
-                                 rq->global_seqno);
+                                 rq ? rq->global_seqno : 0);
                        GEM_BUG_ON(count == 0);
                        if (--count == 0) {
                                GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
@@ -1555,6 +1555,8 @@ static void reset_common_ring(struct intel_engine_cs *engine,
        struct intel_context *ce;
        unsigned long flags;
 
+       GEM_TRACE("%s seqno=%x\n",
+                 engine->name, request ? request->global_seqno : 0);
        spin_lock_irqsave(&engine->timeline->lock, flags);
 
        /*