gpu: nvgpu: cyclestats snapshot permissions rework

Cyclestats snapshot feature is expected for new devices.
The detection code was isolated in separate function and run-time
check added to validate/allow ioctl calls on the current GPU.

Bug 1674079

Change-Id: Icc2f1e5cc50d39b395d31d5292c314f99d67f3eb
Signed-off-by: Leonid Moiseichuk <lmoiseichuk@nvidia.com>
Reviewed-on: http://git-master/r/781697
(cherry picked from commit bdd23136b182c933841f91dd2829061e278a46d4)
Reviewed-on: http://git-master/r/793630
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 2ba160dd..21a3bec5 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -467,6 +467,11 @@ static int gk20a_channel_cycle_stats(struct channel_gk20a *ch,
         struct dma_buf *dmabuf;
         void *virtual_address;
 
+        /* is it allowed to handle calls for current GPU? */
+        if (0 == (ch->g->gpu_characteristics.flags &
+                        NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS))
+                return -ENOSYS;
+
         if (args->dmabuf_fd && !ch->cyclestate.cyclestate_buffer_handler) {
 
                 /* set up new cyclestats buffer */
@@ -556,6 +561,11 @@ static int gk20a_channel_cycle_stats_snapshot(struct channel_gk20a *ch,
 {
         int ret;
 
+        /* is it allowed to handle calls for current GPU? */
+        if (0 == (ch->g->gpu_characteristics.flags &
+                        NVGPU_GPU_FLAGS_SUPPORT_CYCLE_STATS_SNAPSHOT))
+                return -ENOSYS;
+
         if (!args->dmabuf_fd)
                 return -EINVAL;