gpu: nvgpu: Add check_priv_security fuse ops

-New fuse ops is added to set NVGPU_SEC_PRIVSECURITY
 and NVGPU_SEC_SECUREGPCCS bits in g->enabled_flags
 during hal initialization

-For igpu non simulation platforms, fuses are read
 to decide if gpu should be allowed to boot or not.
--Do not boot gpu if priv_sec_en is set but wpr_enabled
  is not set to 1 or vpr_auto_fetch_disable is not set to 0
--With priv_sec_en set, all falcons have to boot
  in LS mode and this needs wpr_enabled set to 1
  AND vpr_auto_fetch_disable set to 0. In this case
  gmmu tries to pull wpr and vpr settings from tegra mc

Bug 2018223

Change-Id: Iceaa1b0b3214e9a3d6cef5d77a82e034302f748b
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1595454
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

3 files changed, 136 insertions, 13 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/fuse_gm20b.c b/drivers/gpu/nvgpu/gm20b/fuse_gm20b.c
new file mode 100644
index 00000000..165d5b43
--- /dev/null
+++ b/drivers/gpu/nvgpu/gm20b/fuse_gm20b.c
@@ -0,0 +1,90 @@
+/*
+ * GM20B FUSE
+ *
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/types.h>
+#include <nvgpu/fuse.h>
+#include <nvgpu/enabled.h>
+
+#include "gk20a/gk20a.h"
+
+#include "fuse_gm20b.h"
+
+#include <nvgpu/hw/gm20b/hw_fuse_gm20b.h>
+
+int gm20b_fuse_check_priv_security(struct gk20a *g)
+{
+        u32 gcplex_config;
+
+        if (nvgpu_is_enabled(g, NVGPU_IS_FMODEL)) {
+                __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, true);
+                __nvgpu_set_enabled(g, NVGPU_SEC_SECUREGPCCS, false);
+                nvgpu_log(g, gpu_dbg_info, "priv sec is enabled in fmodel");
+                return 0;
+        }
+
+        if (nvgpu_tegra_fuse_read_gcplex_config_fuse(g, &gcplex_config)) {
+                nvgpu_err(g, "err reading gcplex config fuse, check fuse clk");
+                return -EINVAL;
+        }
+
+        __nvgpu_set_enabled(g, NVGPU_SEC_SECUREGPCCS, false);
+
+        if (gk20a_readl(g, fuse_opt_priv_sec_en_r())) {
+                /*
+                 * all falcons have to boot in LS mode and this needs
+                 * wpr_enabled set to 1 and vpr_auto_fetch_disable
+                 * set to 0. In this case gmmu tries to pull wpr
+                 * and vpr settings from tegra mc
+                 */
+                __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, true);
+                if ((gcplex_config &
+                         GCPLEX_CONFIG_WPR_ENABLED_MASK) &&
+                        !(gcplex_config &
+                                GCPLEX_CONFIG_VPR_AUTO_FETCH_DISABLE_MASK)) {
+                        if (gk20a_readl(g, fuse_opt_sec_debug_en_r()))
+                                nvgpu_log(g, gpu_dbg_info,
+                                                "gcplex_config = 0x%08x, "
+                                                "secure mode: ACR debug",
+                                                gcplex_config);
+                        else
+                                nvgpu_log(g, gpu_dbg_info,
+                                                "gcplex_config = 0x%08x, "
+                                                "secure mode: ACR non debug",
+                                                gcplex_config);
+                } else {
+                        nvgpu_err(g, "gcplex_config = 0x%08x "
+                                "invalid wpr_enabled/vpr_auto_fetch_disable "
+                                "with priv_sec_en", gcplex_config);
+                        /* do not try to boot GPU */
+                        return -EINVAL;
+                }
+        } else {
+                __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, false);
+                nvgpu_log(g, gpu_dbg_info,
+                                "gcplex_config = 0x%08x, non secure mode",
+                                gcplex_config);
+        }
+
+        return 0;
+}
diff --git a/drivers/gpu/nvgpu/gm20b/fuse_gm20b.h b/drivers/gpu/nvgpu/gm20b/fuse_gm20b.h
new file mode 100644
index 00000000..51734b2f
--- /dev/null
+++ b/drivers/gpu/nvgpu/gm20b/fuse_gm20b.h
@@ -0,0 +1,37 @@
+/*
+ * GM20B FUSE
+ *
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _NVGPU_GM20B_FUSE
+#define _NVGPU_GM20B_FUSE
+
+#define GCPLEX_CONFIG_VPR_AUTO_FETCH_DISABLE_MASK       ((u32)(1 << 0))
+#define GCPLEX_CONFIG_VPR_ENABLED_MASK                  ((u32)(1 << 1))
+#define GCPLEX_CONFIG_WPR_ENABLED_MASK                  ((u32)(1 << 2))
+
+
+struct gk20a;
+
+int gm20b_fuse_check_priv_security(struct gk20a *g);
+
+#endif
diff --git a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
index bb18d2d7..779dde3d 100644
--- a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
@@ -54,6 +54,7 @@
 #include "bus_gm20b.h"
 #include "hal_gm20b.h"
 #include "acr_gm20b.h"
+#include "fuse_gm20b.h"
 
 #include <nvgpu/debug.h>
 #include <nvgpu/bug.h>
@@ -582,6 +583,9 @@ static const struct gpu_ops gm20b_ops = {
         .priv_ring = {
                 .isr = gk20a_priv_ring_isr,
         },
+        .fuse = {
+                .check_priv_security = gm20b_fuse_check_priv_security,
+        },
         .chip_init_gpu_characteristics = gk20a_init_gpu_characteristics,
         .get_litter_value = gm20b_get_litter_value,
 };
@@ -589,7 +593,6 @@ static const struct gpu_ops gm20b_ops = {
 int gm20b_init_hal(struct gk20a *g)
 {
         struct gpu_ops *gops = &g->ops;
-        u32 val;
 
         gops->ltc = gm20b_ops.ltc;
         gops->ce2 = gm20b_ops.ce2;
@@ -625,26 +628,19 @@ int gm20b_init_hal(struct gk20a *g)
 
         gops->priv_ring = gm20b_ops.priv_ring;
 
+        gops->fuse = gm20b_ops.fuse;
+
         /* Lone functions */
         gops->chip_init_gpu_characteristics =
                 gm20b_ops.chip_init_gpu_characteristics;
         gops->get_litter_value = gm20b_ops.get_litter_value;
 
         __nvgpu_set_enabled(g, NVGPU_GR_USE_DMA_FOR_FW_BOOTSTRAP, true);
-        __nvgpu_set_enabled(g, NVGPU_SEC_SECUREGPCCS, false);
         __nvgpu_set_enabled(g, NVGPU_PMU_PSTATE, false);
 
-        if (nvgpu_is_enabled(g, NVGPU_IS_FMODEL)) {
-                __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, true);
-        } else {
-                val = gk20a_readl(g, fuse_opt_priv_sec_en_r());
-                if (!val) {
-                        gk20a_dbg_info("priv security is disabled in HW");
-                        __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, false);
-                } else {
-                        __nvgpu_set_enabled(g, NVGPU_SEC_PRIVSECURITY, true);
-                }
-        }
+        /* Read fuses to check if gpu needs to boot in secure/non-secure mode */
+        if (gops->fuse.check_priv_security(g))
+                return -EINVAL; /* Do not boot gpu */
 
         /* priv security dependent ops */
         if (nvgpu_is_enabled(g, NVGPU_SEC_PRIVSECURITY)) {