gpu: nvgpu: Program NISO sysmem flush addr

Program sysmem flush address to prevent random accesses of
address 0.

Change-Id: I886170395f036805f02e0bce7ecd3c8c46b921df
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1129216
GVS: Gerrit_Virtual_Submit
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index 2d137bbe..2c2df1a9 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -359,6 +359,8 @@ struct mm_gk20a {
         bool has_physical_mode;
         /* false if vidmem aperture actually points to sysmem */
         bool vidmem_is_vidmem;
+
+        struct mem_desc sysmem_flush;
 };
 
 int gk20a_mm_init(struct mm_gk20a *mm);