gpu: nvgpu: allocate secure buffer in probe

Allocate dummy secure buffer of size PAGE_SIZE during gk20a_probe().
This will also help to initiate first secure memory (VPR)
resize call while GPU is rail gated and in reset.

This dummy buffer is released after we allocate some more
secure memory buffers in alloc_global_ctx_buffers()

Bug 1487804

Change-Id: I61604d9e5ffb585801ee893435c98a0d3e69d666
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/421701
(cherry picked from commit 4236ab3323ee3c02fac562740d8b80d763589dea)
Reviewed-on: http://git-master/r/419610
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index f3e82243..0e178e9e 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -2348,6 +2348,9 @@ static int gr_gk20a_alloc_global_ctx_buffers(struct gk20a *g)
                                        &gr->global_ctx_buffer[ATTRIBUTE_VPR],
                                        attr_buffer_size);
 
+        if (platform->secure_buffer.destroy)
+                platform->secure_buffer.destroy(pdev, &platform->secure_buffer);
+
         gk20a_dbg_info("golden_image_size : %d",
                    gr->ctx_vars.golden_image_size);