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, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index cc1b221d..9c201f32 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -2011,8 +2011,10 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
             gk20a_platform_has_syncpoints(g->dev))
                 gpu->flags |= NVGPU_GPU_FLAGS_HAS_SYNCPOINTS;
 
-        if (IS_ENABLED(CONFIG_GK20A_CYCLE_STATS))
+        if (IS_ENABLED(CONFIG_GK20A_CYCLE_STATS)) {
                 gpu->flags |= NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS;
+                gpu->flags |= NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT;
+        }
 
         gpu->gpc_mask = 1;