Re: [PATCH 24/47] drm/i915/guc: Add several request trace points

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On 24/06/2021 08:04, Matthew Brost wrote:
Add trace points for request dependencies and GuC submit. Extended
existing request trace points to include submit fence value,, guc_id,
and ring tail value.

Cc: John Harrison <john.c.harrison@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c |  3 ++
  drivers/gpu/drm/i915/i915_request.c           |  3 ++
  drivers/gpu/drm/i915/i915_trace.h             | 39 ++++++++++++++++++-
  3 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 89b3c7e5d15b..c2327eebc09c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -422,6 +422,7 @@ static int guc_dequeue_one_context(struct intel_guc *guc)
  			guc->stalled_request = last;
  			return false;
  		}
+		trace_i915_request_guc_submit(last);
  	}
guc->stalled_request = NULL;
@@ -642,6 +643,8 @@ static int guc_bypass_tasklet_submit(struct intel_guc *guc,
  	ret = guc_add_request(guc, rq);
  	if (ret == -EBUSY)
  		guc->stalled_request = rq;
+	else
+		trace_i915_request_guc_submit(rq);
return ret;
  }
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index d92c9f25c9f4..7f7aa096e873 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1344,6 +1344,9 @@ __i915_request_await_execution(struct i915_request *to,
  			return err;
  	}
+ trace_i915_request_dep_to(to);
+	trace_i915_request_dep_from(from);

Are those two guaranteed to be atomic ie. no other dep_to/dep_from can get injected in the middle of them and if so what guarantees that?

Actually we had an internal discussion going in November 2019 on these very tracepoints which I think was left hanging in the air.

There I was suggesting you create a single tracepoint in the format of "from -> to", so it's clear without any doubt what is going on.

I also suggested this should out outside the GuC patch since it is backend agnostic.

I also asked why only this flavour of dependencies and not all. You said this was the handy one for debugging GuC backend issues. I said in that case you should name it trace_i915_request_await_request so it is clearer it does not cover all dependencies.

As it stands it is a bit misleadingly named, has that question mark around atomicity, and also is not GuC specific. So really I wouldn't think it passes the bar in the current state.
Regards,

Tvrtko

P.S. Same discussion from 2019 also talked about trace_i915_request_guc_submit and how it exactly aligns to existing request in tracepoint. You were saying the new one is handy because it corresponds with H2G, as the last request_in of the group would trigger it. I was saying that then you could either know implicitly last request_in triggers H2G, or that you could consider adding explicit H2G tracepoints.

+
  	/* Couple the dependency tree for PI on this exposed to->fence */
  	if (to->engine->sched_engine->schedule) {
  		err = i915_sched_node_add_dependency(&to->sched,
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 6778ad2a14a4..b02d04b6c8f6 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -794,22 +794,27 @@ DECLARE_EVENT_CLASS(i915_request,
  	    TP_STRUCT__entry(
  			     __field(u32, dev)
  			     __field(u64, ctx)
+			     __field(u32, guc_id)
  			     __field(u16, class)
  			     __field(u16, instance)
  			     __field(u32, seqno)
+			     __field(u32, tail)
  			     ),
TP_fast_assign(
  			   __entry->dev = rq->engine->i915->drm.primary->index;
  			   __entry->class = rq->engine->uabi_class;
  			   __entry->instance = rq->engine->uabi_instance;
+			   __entry->guc_id = rq->context->guc_id;
  			   __entry->ctx = rq->fence.context;
  			   __entry->seqno = rq->fence.seqno;
+			   __entry->tail = rq->tail;
  			   ),
- TP_printk("dev=%u, engine=%u:%u, ctx=%llu, seqno=%u",
+	    TP_printk("dev=%u, engine=%u:%u, guc_id=%u, ctx=%llu, seqno=%u, tail=%u",
  		      __entry->dev, __entry->class, __entry->instance,
-		      __entry->ctx, __entry->seqno)
+		      __entry->guc_id, __entry->ctx, __entry->seqno,
+		      __entry->tail)
  );
DEFINE_EVENT(i915_request, i915_request_add,
@@ -818,6 +823,21 @@ DEFINE_EVENT(i915_request, i915_request_add,
  );
#if defined(CONFIG_DRM_I915_LOW_LEVEL_TRACEPOINTS)
+DEFINE_EVENT(i915_request, i915_request_dep_to,
+	     TP_PROTO(struct i915_request *rq),
+	     TP_ARGS(rq)
+);
+
+DEFINE_EVENT(i915_request, i915_request_dep_from,
+	     TP_PROTO(struct i915_request *rq),
+	     TP_ARGS(rq)
+);
+
+DEFINE_EVENT(i915_request, i915_request_guc_submit,
+	     TP_PROTO(struct i915_request *rq),
+	     TP_ARGS(rq)
+);
+
  DEFINE_EVENT(i915_request, i915_request_submit,
  	     TP_PROTO(struct i915_request *rq),
  	     TP_ARGS(rq)
@@ -887,6 +907,21 @@ TRACE_EVENT(i915_request_out,
#else
  #if !defined(TRACE_HEADER_MULTI_READ)
+static inline void
+trace_i915_request_dep_to(struct i915_request *rq)
+{
+}
+
+static inline void
+trace_i915_request_dep_from(struct i915_request *rq)
+{
+}
+
+static inline void
+trace_i915_request_guc_submit(struct i915_request *rq)
+{
+}
+
  static inline void
  trace_i915_request_submit(struct i915_request *rq)
  {

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