gpu: nvgpu: cyclestats snapshots are only for t210

The cyclestats mode-e feature supported by userspace only
for t210 devices, so kernel should advertize it only for t210.

Also small check added to prevent BUG in dma-buf.c:826
if device has lack of memory.

Bug 1662506

Change-Id: I8417a8cdd9092e64126382f379d171932e4592a1
Signed-off-by: Leonid Moiseichuk <lmoiseichuk@nvidia.com>
Reviewed-on: http://git-master/r/767073
(cherry picked from commit 06f86b6e78bae5e26e32466716c18e7918efb1b1)
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-on: http://git-master/r/767148
Reviewed-by: Automatic_Commit_Validation_User

2 files changed, 9 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
index b23d2794..34910152 100644
--- a/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/css_gr_gk20a.c
@@ -569,8 +569,10 @@ static int css_gr_free_client_data(struct gk20a_cs_snapshot *data,
                                 client->perfmon_start, client->perfmon_count))
                         ret = -EINVAL;
         }
+
         if (client->dma_handler) {
-                dma_buf_vunmap(client->dma_handler, client->snapshot);
+                if (client->snapshot)
+                        dma_buf_vunmap(client->dma_handler, client->snapshot);
                 dma_buf_put(client->dma_handler);
         }
 
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index b1747987..badb7717 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -2008,7 +2008,12 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
 
         if (IS_ENABLED(CONFIG_GK20A_CYCLE_STATS)) {
                 gpu->flags |= NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS;
-                gpu->flags |= NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT;
+                /* the snapshots must be supported only for t210 */
+                if (NVGPU_GPU_ARCH_GM200 == gpu->arch &&
+                                NVGPU_GPU_IMPL_GM20B == gpu->impl) {
+                        gpu->flags |=
+                                NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT;
+                }
         }
 
         gpu->gpc_mask = 1;