[PATCH v3 5/8] drm/amdgpu: add a amdgpu_cs_start trace event

[Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>]

amdgpu_cs_ioctl already exists but serves a different
purpose.

amdgpu_cs_start marks the beginning of the kernel processing of
the ioctl which is useful for tools to map which events belong to
the same submission (without this, the first event would be the
amdgpu_bo_set_list ones).

v2: renamed to amdgpu_cs_start

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c    |  2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 0a4b09709cfb..f3369cd0d9a3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1402,6 +1402,8 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 		return r;
 	}
 
+	trace_amdgpu_cs_start(data);
+
 	r = amdgpu_cs_pass1(&parser, data);
 	if (r)
 		goto error_fini;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
index 0e47cbe7e0a9..3f18f570e5ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h
@@ -189,6 +189,18 @@ TRACE_EVENT(amdgpu_cs_ioctl,
 		      __entry->seqno, __get_str(ring), __entry->num_ibs)
 );
 
+TRACE_EVENT(amdgpu_cs_start,
+	    TP_PROTO(union drm_amdgpu_cs *cs),
+	    TP_ARGS(cs),
+	    TP_STRUCT__entry(
+			     __field(uint32_t, ctx_id)
+	    ),
+	    TP_fast_assign(
+			   __entry->ctx_id = cs->in.ctx_id;
+	    ),
+	    TP_printk("context=%u", __entry->ctx_id)
+);
+
 TRACE_EVENT(amdgpu_sched_run_job,
 	    TP_PROTO(struct amdgpu_job *job),
 	    TP_ARGS(job),
-- 
2.40.1