In Gpuvis [1] we added matching of the OA report tags against i915
tracepoints fields to figure what workload was submitted by what
process. It doesn't matter much whether HW tags get reused for a
single request, as it gets preempted for example. All we need is link
between the OA report and seqno/engine over a short period of time.
That is enough to find the relationship between the different elements
on a timeline.
The tags got removed from the tracepoints in 2935ed5339c4 ("drm/i915:
Remove logical HW ID"). I was fine with the idea of reuse and dropping
them from most tracepoints, but we still need it at execlist port
insertion.
This change brings the hw_id back just for the i915_request_in
tracepoint.
TODO: someone figures what Guc's putting in the upper 32bits of the
execlist port
v2: s/hw_tag/hw_id/ to keep the old gpuvis code going
v3: Don't store anything on i915_request
[1] : https://github.com/mikesart/gpuvis/wiki/TechDocs-Intel#gpu-generated-countersevents
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
Fixes: 2935ed5339c4 ("drm/i915: Remove logical HW ID")
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 6 +++++-
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 3 ++-
drivers/gpu/drm/i915/i915_trace.h | 8 +++++---
3 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 6fbad5e2343f..58970099db25 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1278,7 +1278,6 @@ execlists_schedule_in(struct i915_request *rq, int idx)
struct intel_engine_cs *old;
GEM_BUG_ON(!intel_engine_pm_is_awake(rq->engine));
- trace_i915_request_in(rq, idx);
old = READ_ONCE(ce->inflight);
do {
@@ -1288,6 +1287,11 @@ execlists_schedule_in(struct i915_request *rq, int idx)
}
} while (!try_cmpxchg(&ce->inflight, &old, ptr_inc(old)));
+ /*
+ * Emit the tracepoint once the ce->lrc_desc has been updated.
+ */
+ trace_i915_request_in(rq, idx, ce->lrc_desc >> 32);
+
GEM_BUG_ON(intel_context_inflight(ce) != rq->engine);
return i915_request_get(rq);
}
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 fe7778c28d2d..fd3d63d720d9 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -263,7 +263,8 @@ static inline int rq_prio(const struct i915_request *rq)
static struct i915_request *schedule_in(struct i915_request *rq, int idx)
{
- trace_i915_request_in(rq, idx);
+ trace_i915_request_in(rq, idx,
+ 0 /* TODO: figure out what value GuC chooses */);
/*
* Currently we are not tracking the rq->context being inflight
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index bc854ad60954..3a36adb8094b 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -790,7 +790,7 @@ DEFINE_EVENT(i915_request, i915_request_execute,
);
TRACE_EVENT(i915_request_in,
- TP_PROTO(struct i915_request *rq, unsigned int port),
+ TP_PROTO(struct i915_request *rq, unsigned int port, u32 hw_id),
TP_ARGS(rq, port),
TP_STRUCT__entry(
@@ -801,6 +801,7 @@ TRACE_EVENT(i915_request_in,
__field(u32, seqno)
__field(u32, port)
__field(s32, prio)
+ __field(u32, hw_id)
),
TP_fast_assign(
@@ -811,12 +812,13 @@ TRACE_EVENT(i915_request_in,
__entry->seqno = rq->fence.seqno;
__entry->prio = rq->sched.attr.priority;
__entry->port = port;
+ __entry->hw_id = hw_id;
),
- TP_printk("dev=%u, engine=%u:%u, ctx=%llu, seqno=%u, prio=%d, port=%u",
+ TP_printk("dev=%u, engine=%u:%u, ctx=%llu, seqno=%u, prio=%d, port=%u hw_id=%u",
__entry->dev, __entry->class, __entry->instance,
__entry->ctx, __entry->seqno,
- __entry->prio, __entry->port)
+ __entry->prio, __entry->port, __entry->hw_id)
);
TRACE_EVENT(i915_request_out,
--
2.26.1
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