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walnux/drivers/misc/optee_msg.h
Theodore Karatapanis 707cdaf42e drivers/misc/optee: Expanded RPC support. 
This commit expands RPC support for the OP-TEE driver using 2 files:
1) drivers/misc/optee_rpc.c
   * Add support for RPCs that can be handled directly by the kernel.
   * Can delegate RPC handling to optee_supplicant.c for RPCs that
     need userspace interaction.
2) drivers/misc/optee_supplicant.c
   * Enable communication between the userspace TEE supplicant and the
     kernel driver.

Additional changes were needed to the following files:
1) drivers/misc/optee.c
   * Add ioctls used SOLELY by the userspace TEE supplicant.
   * Register /dev/teepriv0 if the supplicant is enabled in Kconfig
   * Add OPTEE_ROLE_CA and OPTEE_ROLE_SUPPLICANT conditionals to
     differentiate paths, between a normal Client Application (CA)
     and the TEE supplicant.
   * Change some functions from static to "public" to reuse them
     in other C files.
   * Adjust optee_to/from_msg_param() to work with RPCs.

2) drivers/misc/optee_smc.c
   * Call the RPC handler from optee_rpc.c

3) drivers/misc/optee_msg.h
   * Add definition needed for RPCs

4) drivers/misc/tee.h
   * Add ioctl definitions
   * Add TEE_SHM_SUPP flag, checked when unregistering supplicant
     memory.

5) Documentation/guides/optee.rs
   * Add documentation for RPCs and the supplicant.

6) drivers/misc/{CMakeLists.txt, Make.defs}
   * Account for the new files.

7) drivers/misc/Kconfig
   * Add DEV_OPTEE_SUPPLICANT option to enable/disable the supplicant
     driver.

Signed-off-by: Theodore Karatapanis <tkaratapanis@census-labs.com>
2025-08-06 02:29:33 +08:00

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/****************************************************************************
* drivers/misc/optee_msg.h
*
* SPDX-License-Identifier: BSD-2-Clause
* Copyright (c) 2015-2020, Linaro Limited
*
****************************************************************************/
#ifndef __DRIVERS_MISC_OPTEE_MSG_H
#define __DRIVERS_MISC_OPTEE_MSG_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <nuttx/bits.h>
/* This file defines the OP-TEE message protocol (ABI) used to communicate
* with an instance of OP-TEE running in secure world.
*
* This file is divided into two sections.
* 1. Formatting of messages.
* 2. Requests from normal world
* 3. Requests from secure world, Remote Procedure Call (RPC), handled by
* tee-supplicant
*/
/****************************************************************************
* Part 1 - formatting of messages
****************************************************************************/
#define OPTEE_MSG_ATTR_TYPE_NONE 0x0
#define OPTEE_MSG_ATTR_TYPE_VALUE_INPUT 0x1
#define OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT 0x2
#define OPTEE_MSG_ATTR_TYPE_VALUE_INOUT 0x3
#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 0x5
#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 0x6
#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 0x7
#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT
#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT OPTEE_MSG_ATTR_TYPE_RMEM_INOUT
#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 0x9
#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT 0xa
#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT 0xb
#define OPTEE_MSG_ATTR_TYPE_MASK GENMASK(7, 0)
/* Meta parameter to be absorbed by the Secure OS and not passed
* to the Trusted Application.
* Currently only used with OPTEE_MSG_CMD_OPEN_SESSION.
*/
#define OPTEE_MSG_ATTR_META BIT(8)
/* Pointer to a list of pages used to register user-defined SHM buffer.
* Used with OPTEE_MSG_ATTR_TYPE_TMEM_*.
* buf_ptr should point to the beginning of the buffer. Buffer will contain
* list of page addresses. OP-TEE core can reconstruct contiguous buffer from
* that page addresses list. Page addresses are stored as 64 bit values.
* Last entry on a page should point to the next page of buffer.
* Every entry in buffer should point to a 4k page beginning (12 least
* significant bits must be equal to zero).
*
* 12 least significant bits of optee_msg_param.u.tmem.buf_ptr should hold
* page offset of user buffer.
*
* So, entries should be placed like members of this structure:
*
* struct page_data {
* uint64_t pages_array[
* OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1];
* uint64_t next_page_data;
* };
*
* Structure is designed to exactly fit into the page size
* OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page.
*
* The size of 4KB is chosen because this is the smallest page size for ARM
* architectures. If REE uses larger pages, it should divide them to 4KB
* ones.
*/
#define OPTEE_MSG_ATTR_NONCONTIG BIT(9)
/* Memory attributes for caching passed with temp memrefs. The actual value
* used is defined outside the message protocol with the exception of
* OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already
* defined for the memory range should be used. If optee_smc.h is used as
* bearer of this protocol OPTEE_SMC_SHM_* is used for values.
*/
#define OPTEE_MSG_ATTR_CACHE_SHIFT 16
#define OPTEE_MSG_ATTR_CACHE_MASK GENMASK(2, 0)
#define OPTEE_MSG_ATTR_CACHE_PREDEFINED 0
/* Same values as TEE_LOGIN_* from TEE Internal API */
#define OPTEE_MSG_LOGIN_PUBLIC 0x00000000
#define OPTEE_MSG_LOGIN_USER 0x00000001
#define OPTEE_MSG_LOGIN_GROUP 0x00000002
#define OPTEE_MSG_LOGIN_APPLICATION 0x00000004
#define OPTEE_MSG_LOGIN_APPLICATION_USER 0x00000005
#define OPTEE_MSG_LOGIN_APPLICATION_GROUP 0x00000006
/* Page size used in non-contiguous buffer entries */
#define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096
#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID 0xffffffffffffffff
/* struct optee_msg_param_tmem - temporary memory reference parameter
* buf_ptr: Address of the buffer
* size: Size of the buffer
* shm_ref: Temporary shared memory reference, pointer to a struct
* tee_shm
*
* Secure and normal world communicates pointers as physical address
* instead of the virtual address. This is because secure and normal world
* have completely independent memory mapping. Normal world can even have a
* hypervisor which need to translate the guest physical address (AKA IPA
* in ARM documentation) to a real physical address before passing the
* structure to secure world.
*/
struct optee_msg_param_tmem
{
uint64_t buf_ptr;
uint64_t size;
uint64_t shm_ref;
};
/* struct optee_msg_param_rmem - registered memory reference parameter
* offs: Offset into shared memory reference
* size: Size of the buffer
* shm_ref: Shared memory reference, pointer to a struct tee_shm
*/
struct optee_msg_param_rmem
{
uint64_t offs;
uint64_t size;
uint64_t shm_ref;
};
/* struct optee_msg_param_fmem - ffa memory reference parameter
* offs_lower: Lower bits of offset into shared memory reference
* offs_upper: Upper bits of offset into shared memory reference
* internal_offs: Internal offset into the first page of shared memory
* reference
* size: Size of the buffer
* global_id: Global identifier of Shared memory
*/
struct optee_msg_param_fmem
{
uint32_t offs_low;
uint16_t offs_high;
uint16_t internal_offs;
uint64_t size;
uint64_t global_id;
};
/* struct optee_msg_param_value - opaque value parameter
*
* Value parameters are passed unchecked between normal and secure world.
*/
struct optee_msg_param_value
{
uint64_t a;
uint64_t b;
uint64_t c;
};
/* struct optee_msg_param - parameter used together with struct optee_msg_arg
* attr: attributes
* tmem: parameter by temporary memory reference
* rmem: parameter by registered memory reference
* fmem: parameter by ffa registered memory reference
* value: parameter by opaque value
* octets: parameter by octet string
*
* attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used
* in the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets,
* OPTEE_MSG_ATTR_TYPE_TMEM_* indicates tmem and
* OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_*
* indicates rmem or fmem depending on the conduit.
* OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
*/
struct optee_msg_param
{
uint64_t attr;
union
{
struct optee_msg_param_tmem tmem;
struct optee_msg_param_rmem rmem;
struct optee_msg_param_fmem fmem;
struct optee_msg_param_value value;
uint8_t octets[24];
} u;
};
/* struct optee_msg_arg - call argument
* cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_*
* func: Trusted Application function, specific to the Trusted Application,
* used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND
* session: In parameter for all OPTEE_MSG_CMD_* except
* OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter
* instead
* cancel_id: Cancellation id, a unique value to identify this request
* ret: return value
* ret_origin: origin of the return value
* num_params: number of parameters supplied to the OS Command
* params: the parameters supplied to the OS Command
*
* All normal calls to Trusted OS uses this struct. If cmd requires further
* information than what these fields hold it can be passed as a parameter
* tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding
* attrs field). All parameters tagged as meta have to come first.
*/
struct optee_msg_arg
{
uint32_t cmd;
uint32_t func;
uint32_t session;
uint32_t cancel_id;
uint32_t pad;
uint32_t ret;
uint32_t ret_origin;
uint32_t num_params;
/* num_params tells the actual number of element in params */
struct optee_msg_param params[];
};
/* OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg
*
* num_params: Number of parameters embedded in the struct optee_msg_arg
*
* Returns the size of the struct optee_msg_arg together with the number
* of embedded parameters.
*/
#define OPTEE_MSG_GET_ARG_SIZE(num_params) \
(sizeof(struct optee_msg_arg) + \
sizeof(struct optee_msg_param) * (num_params))
/****************************************************************************
* Part 2 - requests from normal world
****************************************************************************/
/* Return the following UID if using API specified in this file without
* further extensions:
* 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
* Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1,
* OPTEE_MSG_UID_2, OPTEE_MSG_UID_3.
*/
#define OPTEE_MSG_UID_0 0x384fb3e0
#define OPTEE_MSG_UID_1 0xe7f811e3
#define OPTEE_MSG_UID_2 0xaf630002
#define OPTEE_MSG_UID_3 0xa5d5c51b
#define OPTEE_MSG_FUNCID_CALLS_UID 0xFF01
/* Returns 2.0 if using API specified in this file without further
* extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR
* and OPTEE_MSG_REVISION_MINOR
*/
#define OPTEE_MSG_REVISION_MAJOR 2
#define OPTEE_MSG_REVISION_MINOR 0
#define OPTEE_MSG_FUNCID_CALLS_REVISION 0xFF03
/* Get UUID of Trusted OS.
*
* Used by non-secure world to figure out which Trusted OS is installed.
* Note that returned UUID is the UUID of the Trusted OS, not of the API.
*
* Returns UUID in 4 32-bit words in the same way as
* OPTEE_MSG_FUNCID_CALLS_UID described above.
*/
#define OPTEE_MSG_OS_OPTEE_UUID_0 0x486178e0
#define OPTEE_MSG_OS_OPTEE_UUID_1 0xe7f811e3
#define OPTEE_MSG_OS_OPTEE_UUID_2 0xbc5e0002
#define OPTEE_MSG_OS_OPTEE_UUID_3 0xa5d5c51b
#define OPTEE_MSG_FUNCID_GET_OS_UUID 0x0000
/* Get revision of Trusted OS.
*
* Used by non-secure world to figure out which version of the Trusted OS
* is installed. Note that the returned revision is the revision of the
* Trusted OS, not of the API.
*
* Returns revision in 2 32-bit words in the same way as
* OPTEE_MSG_CALLS_REVISION described above.
*/
#define OPTEE_MSG_FUNCID_GET_OS_REVISION 0x0001
/* Do a secure call with struct optee_msg_arg as argument
* The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd
*
* OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application.
* The first two parameters are tagged as meta, holding two value
* parameters to pass the following information:
* param[0].u.value.a-b uuid of Trusted Application
* param[1].u.value.a-b uuid of Client
* param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_*
*
* OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened
* session to a Trusted Application. struct optee_msg_arg::func is Trusted
* Application function, specific to the Trusted Application.
*
* OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to
* Trusted Application.
*
* OPTEE_MSG_CMD_CANCEL cancels a currently invoked command.
*
* OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The
* information is passed as:
* [in] param[0].attr OPTEE_MSG_ATTR_TYPE_TMEM_INPUT
* [| OPTEE_MSG_ATTR_NONCONTIG]
* [in] param[0].u.tmem.buf_ptr physical address (of first fragment)
* [in] param[0].u.tmem.size size (of first fragment)
* [in] param[0].u.tmem.shm_ref holds shared memory reference
*
* OPTEE_MSG_CMD_UNREGISTER_SHM unregisters a previously registered shared
* memory reference. The information is passed as:
* [in] param[0].attr OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
* [in] param[0].u.rmem.shm_ref holds shared memory reference
* [in] param[0].u.rmem.offs 0
* [in] param[0].u.rmem.size 0
*
* OPTEE_MSG_CMD_DO_BOTTOM_HALF does the scheduled bottom half processing
* of a driver.
*
* OPTEE_MSG_CMD_STOP_ASYNC_NOTIF informs secure world that from now is
* normal world unable to process asynchronous notifications. Typically
* used when the driver is shut down.
*/
#define OPTEE_MSG_CMD_OPEN_SESSION 0
#define OPTEE_MSG_CMD_INVOKE_COMMAND 1
#define OPTEE_MSG_CMD_CLOSE_SESSION 2
#define OPTEE_MSG_CMD_CANCEL 3
#define OPTEE_MSG_CMD_REGISTER_SHM 4
#define OPTEE_MSG_CMD_UNREGISTER_SHM 5
#define OPTEE_MSG_CMD_DO_BOTTOM_HALF 6
#define OPTEE_MSG_CMD_STOP_ASYNC_NOTIF 7
#define OPTEE_MSG_FUNCID_CALL_WITH_ARG 0x0004
/****************************************************************************
* Part 3 - Requests from secure world, RPC
****************************************************************************/
/* All RPC is done with a struct optee_msg_arg as bearer of information,
* struct optee_msg_arg::arg holds values defined by OPTEE_MSG_RPC_CMD_*
* below
*
* RPC communication with tee-supplicant is reversed compared to normal
* client communication described above. The supplicant receives requests
* and sends responses.
*
* Load a TA into memory, defined in tee-supplicant
*/
#define OPTEE_MSG_RPC_CMD_LOAD_TA 0
/* Reserved */
#define OPTEE_MSG_RPC_CMD_RPMB 1
/* File system access, defined in tee-supplicant */
#define OPTEE_MSG_RPC_CMD_FS 2
/* Get time
*
* Returns number of seconds and nano seconds since the Epoch,
* 1970-01-01 00:00:00 +0000 (UTC).
*
* [out] param[0].u.value.a Number of seconds
* [out] param[0].u.value.b Number of nano seconds.
*/
#define OPTEE_MSG_RPC_CMD_GET_TIME 3
/* Wait queue primitive, helper for secure world to implement a wait queue.
*
* If secure world need to wait for a secure world mutex it issues a sleep
* request instead of spinning in secure world. Conversely is a wakeup
* request issued when a secure world mutex with a thread waiting thread is
* unlocked.
*
* Waiting on a key
* [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP
* [in] param[0].u.value.b wait key
*
* Waking up a key
* [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP
* [in] param[0].u.value.b wakeup key
*/
#define OPTEE_MSG_RPC_CMD_WAIT_QUEUE 4
#define OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP 0
#define OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP 1
/* Suspend execution
*
* [in] param[0].value .a number of milliseconds to suspend
*/
#define OPTEE_MSG_RPC_CMD_SUSPEND 5
/* Allocate a piece of shared memory
*
* Shared memory can optionally be fragmented, to support that additional
* spare param entries are allocated to make room for eventual fragments.
* The spare param entries has .attr = OPTEE_MSG_ATTR_TYPE_NONE when
* unused. All returned temp memrefs except the last should have the
* OPTEE_MSG_ATTR_FRAGMENT bit set in the attr field.
*
* [in] param[0].u.value.a type of memory one of
* OPTEE_MSG_RPC_SHM_TYPE_* below
* [in] param[0].u.value.b requested size
* [in] param[0].u.value.c required alignment
*
* [out] param[0].u.tmem.buf_ptr physical address (of first fragment)
* [out] param[0].u.tmem.size size (of first fragment)
* [out] param[0].u.tmem.shm_ref shared memory reference
* ...
* [out] param[n].u.tmem.buf_ptr physical address
* [out] param[n].u.tmem.size size
* [out] param[n].u.tmem.shm_ref shared memory reference (same value
* as in param[n-1].u.tmem.shm_ref)
*/
#define OPTEE_MSG_RPC_CMD_SHM_ALLOC 6
/* Memory that can be shared with a non-secure user space application */
#define OPTEE_MSG_RPC_SHM_TYPE_APPL 0
/* Memory only shared with non-secure kernel */
#define OPTEE_MSG_RPC_SHM_TYPE_KERNEL 1
/* Free shared memory previously allocated with OPTEE_MSG_RPC_CMD_SHM_ALLOC
*
* [in] param[0].u.value.a type of memory one of
* OPTEE_MSG_RPC_SHM_TYPE_* above
* [in] param[0].u.value.b value of shared memory reference
* returned in param[0].u.tmem.shm_ref
* above
*/
#define OPTEE_MSG_RPC_CMD_SHM_FREE 7
/* Access a device on an i2c bus
*
* [in] param[0].u.value.a mode: RD(0), WR(1)
* [in] param[0].u.value.b i2c adapter
* [in] param[0].u.value.c i2c chip
*
* [in] param[1].u.value.a i2c control flags
*
* [in/out] memref[2] buffer to exchange the transfer data
* with the secure world
*
* [out] param[3].u.value.a bytes transferred by the driver
*/
#define OPTEE_MSG_RPC_CMD_I2C_TRANSFER 21
/* I2C master transfer modes */
#define OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD 0
#define OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR 1
/* I2C master control flags */
#define OPTEE_MSG_RPC_CMD_I2C_FLAGS_TEN_BIT BIT(0)
#endif /* __DRIVERS_MISC_OPTEE_MSG_H */
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