gpu: nvgpu: vgpu: cyclestat characteristics fixes

Fix characteristics for cyclestats:

- SUPPORT_TSG and SUPPORT_CYCLE_STATS_SNAPSHOT were assigned the same value
- For vgpu, SUPPORT_CYCLE_STATS was set redundantly (but differently)
- For vgpu, if the css buffer size is 0, set the support flag to False

JIRA ESRM-88
Bug 200296210

Change-Id: Iaf98dafec55f171b5968c2a8248290284bf30922
Signed-off-by: Peter Daifuku <pdaifuku@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1593939
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/gm20b/vgpu_gr_gm20b.c b/drivers/gpu/nvgpu/vgpu/gm20b/vgpu_gr_gm20b.c
index 56b1edbc..fca6525a 100644
--- a/drivers/gpu/nvgpu/vgpu/gm20b/vgpu_gr_gm20b.c
+++ b/drivers/gpu/nvgpu/vgpu/gm20b/vgpu_gr_gm20b.c
@@ -30,10 +30,20 @@
 void vgpu_gr_gm20b_init_cyclestats(struct gk20a *g)
 {
 #if defined(CONFIG_GK20A_CYCLE_STATS)
-        __nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS, true);
-        __nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS_SNAPSHOT, true);
+        bool snapshots_supported = true;
+
+        /* cyclestats not supported on vgpu */
+        __nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS, false);
+
         g->gpu_characteristics.max_css_buffer_size =
                                                 vgpu_css_get_buffer_size(g);
+
+        /* snapshots not supported if the buffer size is 0 */
+        if (g->gpu_characteristics.max_css_buffer_size == 0)
+                snapshots_supported = false;
+
+        __nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS_SNAPSHOT,
+                                                        snapshots_supported);
 #endif
 }