gpu: nvgpu: Debugfs support for Railgating stats.

This patch calculates:
-Total time spent by GPU with rails gated.
-Total time spent by GPU with rails ungated.
-Total Railgating Cycles.
and dumps this information in debugfs file.

This feature requires CONFIG_DEBUG_FS set to true.

Bug 200195100

Change-Id: I1379f11237ce4900076947e18524caaa3304c7cb
Signed-off-by: Deepak Goyal <dgoyal@nvidia.com>
Reviewed-on: http://git-master/r/1178308
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 949cd4a5..c5da68cc 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -64,6 +64,18 @@ struct cooling_device_gk20a {
         struct gk20a *g;
 };
 
+#ifdef CONFIG_DEBUG_FS
+struct railgate_stats {
+        unsigned long last_rail_gate_start;
+        unsigned long last_rail_gate_complete;
+        unsigned long last_rail_ungate_start;
+        unsigned long last_rail_ungate_complete;
+        unsigned long total_rail_gate_time_ms;
+        unsigned long total_rail_ungate_time_ms;
+        unsigned long railgating_cycle_count;
+};
+#endif
+
 enum gk20a_cbc_op {
         gk20a_cbc_op_clear,
         gk20a_cbc_op_clean,
@@ -687,6 +699,9 @@ struct gk20a {
         struct acr_desc acr;
         struct cooling_device_gk20a gk20a_cdev;
 
+#ifdef CONFIG_DEBUG_FS
+        struct railgate_stats pstats;
+#endif
         /* Save pmu fw here so that it lives cross suspend/resume.
            pmu suspend destroys all pmu sw/hw states. Loading pmu
            fw in resume crashes when the resume is from sys_exit. */