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authorSang-Heon Jeon <ekffu200098@gmail.com>2026-08-24 01:18:14 +0900
committerJulia Lawall <Julia.Lawall@inria.fr>2026-08-23 22:12:11 +0200
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treedcc4da1d99f17541c5590ac63c77da4bf372a4ab /Documentation/driver-api/tee.rst
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coccinelle: alloc_cast: drop removed allocatorsgrafted
- pci_alloc_consistent() and pci_zalloc_consistent() were removed by commit 7968778914e5 ("PCI: Remove the deprecated "pci-dma-compat.h" API") - kmem_alloc() was removed by commit f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") - kmem_zalloc() was removed by commit 10634530f7ba ("xfs: convert kmem_zalloc() to kzalloc()") - kmem_zone_alloc() and kmem_zone_zalloc() were removed by commit bae633a4a283 ("xfs: remove xfs_zone_{alloc,zalloc} helpers") So drop them from the rules. No functional change. Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
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+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================
+TEE (Trusted Execution Environment) driver API
+===============================================
+
+Kernel provides a TEE bus infrastructure where a Trusted Application is
+represented as a device identified via Universally Unique Identifier (UUID) and
+client drivers register a table of supported device UUIDs.
+
+TEE bus infrastructure registers following APIs:
+
+match():
+ iterates over the client driver UUID table to find a corresponding
+ match for device UUID. If a match is found, then this particular device is
+ probed via corresponding probe API registered by the client driver. This
+ process happens whenever a device or a client driver is registered with TEE
+ bus.
+
+uevent():
+ notifies user-space (udev) whenever a new device is registered on
+ TEE bus for auto-loading of modularized client drivers.
+
+TEE bus device enumeration is specific to underlying TEE implementation, so it
+is left open for TEE drivers to provide corresponding implementation.
+
+Then TEE client driver can talk to a matched Trusted Application using APIs
+listed in include/linux/tee_drv.h.
+
+TEE client driver example
+-------------------------
+
+Suppose a TEE client driver needs to communicate with a Trusted Application
+having UUID: ``ac6a4085-0e82-4c33-bf98-8eb8e118b6c2``, so driver registration
+snippet would look like::
+
+ static const struct tee_client_device_id client_id_table[] = {
+ {UUID_INIT(0xac6a4085, 0x0e82, 0x4c33,
+ 0xbf, 0x98, 0x8e, 0xb8, 0xe1, 0x18, 0xb6, 0xc2)},
+ {}
+ };
+
+ MODULE_DEVICE_TABLE(tee, client_id_table);
+
+ static struct tee_client_driver client_driver = {
+ .probe = client_probe,
+ .remove = client_remove,
+ .id_table = client_id_table,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+ };
+
+ module_tee_client_driver(client_driver);