Merge tag 'tee-ts-for-v6.10' of https://git.linaro.org/people/jens.wiklander/linux-tee into soc/drivers

TEE driver for Trusted Services

This introduces a TEE driver for Trusted Services [1].

Trusted Services is a TrustedFirmware.org project that provides a
framework for developing and deploying device Root of Trust services in
FF-A [2] Secure Partitions. The project hosts the reference
implementation of Arm Platform Security Architecture [3] for Arm
A-profile devices.

The FF-A Secure Partitions are accessible through the FF-A driver in
Linux. However, the FF-A driver doesn't have a user space interface so
user space clients currently cannot access Trusted Services. The goal of
this TEE driver is to bridge this gap and make Trusted Services
functionality accessible from user space.

[1] https://www.trustedfirmware.org/projects/trusted-services/
[2] https://developer.arm.com/documentation/den0077/
[3] https://www.arm.com/architecture/security-features/platform-security

* tag 'tee-ts-for-v6.10' of https://git.linaro.org/people/jens.wiklander/linux-tee:
  MAINTAINERS: tee: tstee: Add entry
  Documentation: tee: Add TS-TEE driver
  tee: tstee: Add Trusted Services TEE driver
  tee: optee: Move pool_op helper functions
  tee: Refactor TEE subsystem header files

Link: https://lore.kernel.org/r/20240425073119.GA3261080@rayden
Signed-off-by: Arnd Bergmann <[email protected]>

Author: arndb

Documentation/tee/index.rst

@@ -10,6 +10,7 @@ TEE Subsystem
    tee
    op-tee
    amd-tee
+   ts-tee
 
 .. only::  subproject and html
 

Documentation/tee/ts-tee.rst

@@ -0,0 +1,71 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=================================
+TS-TEE (Trusted Services project)
+=================================
+
+This driver provides access to secure services implemented by Trusted Services.
+
+Trusted Services [1] is a TrustedFirmware.org project that provides a framework
+for developing and deploying device Root of Trust services in FF-A [2] S-EL0
+Secure Partitions. The project hosts the reference implementation of the Arm
+Platform Security Architecture [3] for Arm A-profile devices.
+
+The FF-A Secure Partitions (SP) are accessible through the FF-A driver [4] which
+provides the low level communication for this driver. On top of that the Trusted
+Services RPC protocol is used [5]. To use the driver from user space a reference
+implementation is provided at [6], which is part of the Trusted Services client
+library called libts [7].
+
+All Trusted Services (TS) SPs have the same FF-A UUID; it identifies the TS RPC
+protocol. A TS SP can host one or more services (e.g. PSA Crypto, PSA ITS, etc).
+A service is identified by its service UUID; the same type of service cannot be
+present twice in the same SP. During SP boot each service in the SP is assigned
+an "interface ID". This is just a short ID to simplify message addressing.
+
+The generic TEE design is to share memory at once with the Trusted OS, which can
+then be reused to communicate with multiple applications running on the Trusted
+OS. However, in case of FF-A, memory sharing works on an endpoint level, i.e.
+memory is shared with a specific SP. User space has to be able to separately
+share memory with each SP based on its endpoint ID; therefore a separate TEE
+device is registered for each discovered TS SP. Opening the SP corresponds to
+opening the TEE device and creating a TEE context. A TS SP hosts one or more
+services. Opening a service corresponds to opening a session in the given
+tee_context.
+
+Overview of a system with Trusted Services components::
+
+   User space                  Kernel space                   Secure world
+   ~~~~~~~~~~                  ~~~~~~~~~~~~                   ~~~~~~~~~~~~
+   +--------+                                               +-------------+
+   | Client |                                               | Trusted     |
+   +--------+                                               | Services SP |
+      /\                                                    +-------------+
+      ||                                                          /\
+      ||                                                          ||
+      ||                                                          ||
+      \/                                                          \/
+   +-------+                +----------+--------+           +-------------+
+   | libts |                |  TEE     | TS-TEE |           |  FF-A SPMC  |
+   |       |                |  subsys  | driver |           |   + SPMD    |
+   +-------+----------------+----+-----+--------+-----------+-------------+
+   |      Generic TEE API        |     |  FF-A  |     TS RPC protocol     |
+   |      IOCTL (TEE_IOC_*)      |     | driver |        over FF-A        |
+   +-----------------------------+     +--------+-------------------------+
+
+References
+==========
+
+[1] https://www.trustedfirmware.org/projects/trusted-services/
+
+[2] https://developer.arm.com/documentation/den0077/
+
+[3] https://www.arm.com/architecture/security-features/platform-security
+
+[4] drivers/firmware/arm_ffa/
+
+[5] https://trusted-services.readthedocs.io/en/v1.0.0/developer/service-access-protocols.html#abi
+
+[6] https://git.trustedfirmware.org/TS/trusted-services.git/tree/components/rpc/ts_rpc/caller/linux/ts_rpc_caller_linux.c?h=v1.0.0
+
+[7] https://git.trustedfirmware.org/TS/trusted-services.git/tree/deployments/libts/arm-linux/CMakeLists.txt?h=v1.0.0

MAINTAINERS

@@ -21753,6 +21753,7 @@ F:	Documentation/driver-api/tee.rst
 F:	Documentation/tee/
 F:	Documentation/userspace-api/tee.rst
 F:	drivers/tee/
+F:	include/linux/tee_core.h
 F:	include/linux/tee_drv.h
 F:	include/uapi/linux/tee.h
 
@@ -22546,6 +22547,15 @@ F:	Documentation/ABI/testing/configfs-tsm
 F:	drivers/virt/coco/tsm.c
 F:	include/linux/tsm.h
 
+TRUSTED SERVICES TEE DRIVER
+M:	Balint Dobszay <[email protected]>
+M:	Sudeep Holla <[email protected]>
+L:	[email protected] (moderated for non-subscribers)
+L:	[email protected]
+S:	Maintained
+F:	Documentation/tee/ts-tee.rst
+F:	drivers/tee/tstee/
+
 TTY LAYER AND SERIAL DRIVERS
 M:	Greg Kroah-Hartman <[email protected]>
 M:	Jiri Slaby <[email protected]>

drivers/tee/Kconfig

@@ -15,5 +15,6 @@ if TEE
 
 source "drivers/tee/optee/Kconfig"
 source "drivers/tee/amdtee/Kconfig"
+source "drivers/tee/tstee/Kconfig"
 
 endif

drivers/tee/Makefile

@@ -5,3 +5,4 @@ tee-objs += tee_shm.o
 tee-objs += tee_shm_pool.o
 obj-$(CONFIG_OPTEE) += optee/
 obj-$(CONFIG_AMDTEE) += amdtee/
+obj-$(CONFIG_ARM_TSTEE) += tstee/

drivers/tee/amdtee/amdtee_private.h

@@ -9,7 +9,7 @@
 
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
-#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
 #include <linux/kref.h>
 #include <linux/types.h>
 #include "amdtee_if.h"

drivers/tee/amdtee/call.c

@@ -5,7 +5,7 @@
 
 #include <linux/device.h>
 #include <linux/tee.h>
-#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
 #include <linux/psp-tee.h>
 #include <linux/slab.h>
 #include <linux/psp.h>

drivers/tee/amdtee/core.c

@@ -9,13 +9,12 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/device.h>
-#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/uaccess.h>
 #include <linux/firmware.h>
 #include "amdtee_private.h"
-#include "../tee_private.h"
 #include <linux/psp-tee.h>
 
 static struct amdtee_driver_data *drv_data;

drivers/tee/amdtee/shm_pool.c

@@ -4,7 +4,7 @@
  */
 
 #include <linux/slab.h>
-#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
 #include <linux/psp.h>
 #include "amdtee_private.h"
 

drivers/tee/optee/call.c

@@ -7,7 +7,7 @@
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
 #include <linux/types.h>
 #include "optee_private.h"