gpu: nvgpu: handle timestamp buffer full ctxsw_intr0

If enabled, fecs trace updating happens from ucode
side even when there is no fecs trace dumper application
to consume it. Due to this, trace buffer will get
eventually full and ucode will trigger ctxsw_intr0.
Reset fecs_trace buffer to handle timestamp buffer full
ctxsw_intr0.

Bug 2361571
Bug 200472922

Change-Id: Ia26a17635fc6bd6e8663b8af983acc91839ecfcd
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1965370
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
(cherry picked from commit 790ba095543b33f4cc3a145559ad31a1e9f99d98)
Reviewed-on: https://git-master.nvidia.com/r/1979746
GVS: Gerrit_Virtual_Submit
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Tested-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c b/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
index b30d1743..cac3ce27 100644
--- a/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
@@ -634,4 +634,12 @@ bool gk20a_fecs_trace_is_enabled(struct gk20a *g)
 
         return (trace && nvgpu_thread_is_running(&trace->poll_task));
 }
+
+void gk20a_fecs_trace_reset_buffer(struct gk20a *g)
+{
+        nvgpu_log(g, gpu_dbg_fn|gpu_dbg_ctxsw, " ");
+
+        gk20a_fecs_trace_set_read_index(g,
+                gk20a_fecs_trace_get_write_index(g));
+}
 #endif /* CONFIG_GK20A_CTXSW_TRACE */