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

1 files changed, 3 insertions, 1 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);
         }