gpu: nvgpu: gm20b: dynamically detect priv security for secure boot of falcon

based on the config setting and fuse secure no non secure boot is done

Change-Id: I5937ba945c5a3a86f72e0f2a9078fcde01977137
Signed-off-by: Vijayakumar <vsubbu@nvidia.com>
Reviewed-on: http://git-master/r/487684
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
index 5e8fc0ae..1dafc13d 100644
--- a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
@@ -27,6 +27,10 @@
 #include "mm_gm20b.h"
 #include "pmu_gm20b.h"
 #include "clk_gm20b.h"
+#include <linux/tegra-fuse.h>
+
+#define FUSE_OPT_PRIV_SEC_DIS_0 0x264
+#define PRIV_SECURITY_DISABLE 0x01
 
 struct gpu_ops gm20b_ops = {
         .clock_gating = {
@@ -46,6 +50,34 @@ struct gpu_ops gm20b_ops = {
 int gm20b_init_hal(struct gpu_ops *gops)
 {
         *gops = gm20b_ops;
+#ifdef CONFIG_TEGRA_ACR
+        if (tegra_platform_is_linsim()) {
+                gops->privsecurity = 1;
+        } else {
+                if (tegra_fuse_readl(FUSE_OPT_PRIV_SEC_DIS_0) &
+                                PRIV_SECURITY_DISABLE) {
+                        gk20a_dbg_info("priv security is disabled in HW");
+                        gops->privsecurity = 0;
+                } else {
+                        gops->privsecurity = 1;
+                }
+        }
+#else
+        if (tegra_platform_is_linsim()) {
+                gk20a_dbg_info("running ASIM with PRIV security disabled");
+                gops->privsecurity = 0;
+        } else {
+                if (tegra_fuse_readl(FUSE_OPT_PRIV_SEC_DIS_0) &
+                                PRIV_SECURITY_DISABLE) {
+                        gops->privsecurity = 0;
+                } else {
+                        gk20a_dbg_info("priv security is not supported but enabled");
+                        gops->privsecurity = 1;
+                        return -EPERM;
+                }
+        }
+#endif
+
         gm20b_init_ltc(gops);
         gm20b_init_gr(gops);
         gm20b_init_ltc(gops);