video: tegra: nvmap: Add DT based API disabling support

There are debug/duplicate APIs like NvRmMemGetIVCId,
NvRmMemHandleFromIVCId, NvRmMemWrite etc. which don't have corresponding
requirements in DriveOS 7.0 Linux NSR. We have taken sign-off from the
stakeholders to confirm that they are not using these APIs in T264 Linux
Prod NSR variant. But some of them are using these APIs in dev-nsr and
did not agree to remove it from dev-nsr, L4T, HOS etc. Hence we need to
make sure that they do not accidentally start using these APIs. Hence
add following DT based disabling support.

- Add disable-debug-support property in tegra-carveouts DT node in T264
prod nsr dts.
- Parse this DT node in nvmap and if the above property is present then
BUG_ON in the ioctl functions corresponding to these APIs.

Bug 4980348

Change-Id: Icdd5aadf3197d0649b61d285f433fa65ea69e806
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3298507
Reviewed-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-by: Ashish Mhetre <amhetre@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

drivers/video/tegra/nvmap/nvmap_dev.c

@@ -549,6 +549,23 @@ exit:
 	return memory_available;
 }
 
+/*
+ * Read disable-debug-support property from tegra-carveouts DT node.
+ * If the property is present then don't support any extra APIs other than
+ * the APIs mentioned in ICD, by doing BUG_ON in the corresponding ioctls.
+ * So it is necessary to be present in the DT of the respective builds
+ * (e.g. Prod NSR Build).
+ */
+static void nvmap_support_debug_apis(struct platform_device *pdev, struct nvmap_device *dev)
+{
+	struct device_node *np = pdev->dev.of_node;
+
+	if (of_property_read_bool(np, "disable-debug-support"))
+		dev->support_debug_features = 0;
+	else
+		dev->support_debug_features = 1;
+}
+
 int __init nvmap_probe(struct platform_device *pdev)
 {
 	struct nvmap_platform_data *plat;
@@ -653,6 +670,8 @@ int __init nvmap_probe(struct platform_device *pdev)
 			dev->dev_user.name);
 		goto fail_sci_ipc;
 	}
+
+	(void)nvmap_support_debug_apis(pdev, dev);
 	goto finish;
 fail_sci_ipc:
 	nvmap_sci_ipc_exit();

drivers/video/tegra/nvmap/nvmap_dev.h

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-/* SPDX-FileCopyrightText: Copyright (c) 2009-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+/* SPDX-FileCopyrightText: Copyright (c) 2009-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
 
 #ifndef __NVMAP_DEV_H
 #define __NVMAP_DEV_H
@@ -109,6 +109,7 @@ struct nvmap_device {
 	struct rb_root device_names;
 #endif /* NVMAP_CONFIG_DEBUG_MAPS */
 	u64 serial_id_counter; /* This is global counter common across different client processes */
+	bool support_debug_features;
 };
 
 #define NVMAP_TAG_TRACE(x, ...) 			\

drivers/video/tegra/nvmap/nvmap_ioctl.c

@@ -658,6 +658,8 @@ int nvmap_ioctl_get_ivcid(struct file *filp, void __user *arg)
 	struct nvmap_create_handle op;
 	struct nvmap_handle *h = NULL;
 
+	BUG_ON(nvmap_dev->support_debug_features == 0);
+
 	if (copy_from_user(&op, arg, sizeof(op)))
 		return -EFAULT;
 
@@ -712,6 +714,8 @@ int nvmap_ioctl_create_from_ivc(struct file *filp, void __user *arg)
 	unsigned int peer;
 	struct nvmap_heap_block *block = NULL;
 
+	BUG_ON(nvmap_dev->support_debug_features == 0);
+
 	/* First create a new handle and then fake carveout allocation */
 	if (copy_from_user(&op, arg, sizeof(op)))
 		return -EFAULT;