gpu: nvgpu: add null check for perfbuffer enable and disable dbg ops

This is needed to disable/enable features on new chips

Bug 200352825

Change-Id: I02eb58e6fdd554ed20866fe8a8553a667541f512
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1574481
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
index d1eff233..c3cb0f4c 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
@@ -1911,10 +1911,15 @@ static int gk20a_perfbuf_map(struct dbg_session_gk20a *dbg_s,
         struct mm_gk20a *mm = &g->mm;
         int err;
         u32 virt_size;
-        u32 big_page_size = g->ops.mm.get_default_big_page_size();
+        u32 big_page_size;
+
+        if (!g->ops.dbg_session_ops.perfbuffer_enable)
+                return -ENOSYS;
 
         nvgpu_mutex_acquire(&g->dbg_sessions_lock);
 
+        big_page_size = g->ops.mm.get_default_big_page_size();
+
         if (g->perfbuf.owner) {
                 nvgpu_mutex_release(&g->dbg_sessions_lock);
                 return -EBUSY;
@@ -2015,6 +2020,9 @@ static int gk20a_perfbuf_unmap(struct dbg_session_gk20a *dbg_s,
         struct gk20a *g = dbg_s->g;
         int err;
 
+        if (!g->ops.dbg_session_ops.perfbuffer_disable)
+                return -ENOSYS;
+
         nvgpu_mutex_acquire(&g->dbg_sessions_lock);
         if ((g->perfbuf.owner != dbg_s) ||
                                         (g->perfbuf.offset != args->offset)) {