[PATCH v2 2/6] drm/xe: Add helper to capture engine timestamp

[Lucas De Marchi]

Just like CTX_TIMESTAMP is used to calculate runtime, add a helper to
get the timestamp for the engine so it can be used to calculate the
"engine time" with the same unit as the runtime is recorded.

Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/xe_hw_engine.c | 5 +++++
 drivers/gpu/drm/xe/xe_hw_engine.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c
index 455f375c1cbd..f357de532685 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine.c
@@ -955,3 +955,8 @@ bool xe_hw_engine_is_reserved(struct xe_hw_engine *hwe)
 	return xe->info.has_usm && hwe->class == XE_ENGINE_CLASS_COPY &&
 		hwe->instance == gt->usm.reserved_bcs_instance;
 }
+
+u64 xe_hw_engine_read_timestamp(struct xe_hw_engine *hwe)
+{
+	return xe_mmio_read64_2x32(hwe->gt, RING_TIMESTAMP(hwe->mmio_base));
+}
diff --git a/drivers/gpu/drm/xe/xe_hw_engine.h b/drivers/gpu/drm/xe/xe_hw_engine.h
index 71968ee2f600..a10d5e528958 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.h
+++ b/drivers/gpu/drm/xe/xe_hw_engine.h
@@ -67,4 +67,6 @@ static inline bool xe_hw_engine_is_valid(struct xe_hw_engine *hwe)
 	return hwe->name;
 }
 
+u64 xe_hw_engine_read_timestamp(struct xe_hw_engine *hwe);
+
 #endif
-- 
2.43.0