drm/i915/tracepoints: Add backend level request in and out tracepoints
Two new tracepoints placed at the call sites where requests are
actually passed to the GPU enable userspace to track engine
utilisation.
These tracepoints are only enabled when the
DRM_I915_LOW_LEVEL_TRACEPOINTS Kconfig option is enabled.
v2: Fix compilation with !CONFIG_DRM_I915_LOW_LEVEL_TRACEPOINTS.
v3: Name global seqno consistently across tracepoints.
v4: Remove port info from request out tracepoint. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 5553f55..39329d4 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -479,6 +479,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
cursor->priotree.priority = INT_MAX;
__i915_gem_request_submit(cursor);
+ trace_i915_gem_request_in(cursor, port - engine->execlist_port);
last = cursor;
submit = true;
}
@@ -593,6 +594,7 @@ static void intel_lrc_irq_handler(unsigned long data)
execlists_context_status_change(port[0].request,
INTEL_CONTEXT_SCHEDULE_OUT);
+ trace_i915_gem_request_out(port[0].request);
i915_gem_request_put(port[0].request);
port[0] = port[1];
memset(&port[1], 0, sizeof(port[1]));