gpu: nvgpu: cyclestats mode E snapshots support

That is a kernel supporting code for cyclestats mode E.
Cyclestats mode E implemented following Windows-design in user-space
and required the following operations to be implemented:
- attach a client for shared hardware buffer of device
- detach client from shared hardware buffer
- flush means copy of available data from hardware buffer to private
  client buffers according to perfmon IDs assigned for clients
- perfmon IDs management for user-space clients
- a NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT capability added

Bug 1573150

Change-Id: I9e09f0fbb2be5a95c47e6d80a2e23fa839b46f9a
Signed-off-by: Leonid Moiseichuk <lmoiseichuk@nvidia.com>
Reviewed-on: http://git-master/r/740653
(cherry picked from commit 79fe89fd4cea39d8ab9dbef0558cd806ddfda87f)
Reviewed-on: http://git-master/r/753274
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 7c007622..85d1a886 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -2847,6 +2847,8 @@ static void gk20a_remove_gr_support(struct gr_gk20a *gr)
 
         gk20a_dbg_fn("");
 
+        gr_gk20a_free_cyclestats_snapshot_data(g);
+
         gr_gk20a_free_global_ctx_buffers(g);
 
         gk20a_gmmu_free(g, &gr->mmu_wr_mem);
@@ -4523,6 +4525,11 @@ int gk20a_init_gr_support(struct gk20a *g)
 
         gk20a_dbg_fn("");
 
+#if defined(CONFIG_GK20A_CYCLE_STATS)
+        mutex_init(&g->gr.cs_lock);
+        g->gr.cs_data = NULL;
+#endif
+
         /* this is required before gr_gk20a_init_ctx_state */
         mutex_init(&g->gr.fecs_mutex);