gpu: sysfs mode for allowing access to registers

Through this sysfs entry, the register space becomes accessible.
This is be accessible root-only.

Bug 1523403

Change-Id: Ia46f130a0cfd8324c5b675d19e7cbfba9dcb17ca
Signed-off-by: sujeet baranwal <sbaranwal@nvidia.com>
Reviewed-on: http://git-master/r/454198
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index d9ab99a4..874b8056 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -1713,8 +1713,13 @@ int gr_gk20a_load_golden_ctx_image(struct gk20a *g,
         virt_addr_hi =
                  u64_hi32(ch_ctx->global_ctx_buffer_va[PRIV_ACCESS_MAP_VA]);
 
+        if (g->allow_all)
+                data = ctxsw_prog_main_image_priv_access_map_config_mode_allow_all_f();
+        else
+                data = ctxsw_prog_main_image_priv_access_map_config_mode_use_map_f();
+
         gk20a_mem_wr32(ctx_ptr + ctxsw_prog_main_image_priv_access_map_config_o(), 0,
-                 ctxsw_prog_main_image_priv_access_map_config_mode_use_map_f());
+                 data);
         gk20a_mem_wr32(ctx_ptr + ctxsw_prog_main_image_priv_access_map_addr_lo_o(), 0,
                  virt_addr_lo);
         gk20a_mem_wr32(ctx_ptr + ctxsw_prog_main_image_priv_access_map_addr_hi_o(), 0,