drivers/tee/optee/optee_msg.h

   1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
   2 /*
   3  * Copyright (c) 2015-2019, Linaro Limited
   4  */
   5 #ifndef _OPTEE_MSG_H
   6 #define _OPTEE_MSG_H
   7
   8 #include <linux/bitops.h>
   9 #include <linux/types.h>
  10
  11 /*
  12  * This file defines the OP-TEE message protocol used to communicate
  13  * with an instance of OP-TEE running in secure world.
  14  *
  15  * This file is divided into three sections.
  16  * 1. Formatting of messages.
  17  * 2. Requests from normal world
  18  * 3. Requests from secure world, Remote Procedure Call (RPC), handled by
  19  *    tee-supplicant.
  20  */
  21
  22 /*****************************************************************************
  23  * Part 1 - formatting of messages
  24  *****************************************************************************/
  25
  26 #define OPTEE_MSG_ATTR_TYPE_NONE                0x0
  27 #define OPTEE_MSG_ATTR_TYPE_VALUE_INPUT         0x1
  28 #define OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT        0x2
  29 #define OPTEE_MSG_ATTR_TYPE_VALUE_INOUT         0x3
  30 #define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT          0x5
  31 #define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT         0x6
  32 #define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT          0x7
  33 #define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT          0x9
  34 #define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT         0xa
  35 #define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT          0xb
  36
  37 #define OPTEE_MSG_ATTR_TYPE_MASK                GENMASK(7, 0)
  38
  39 /*
  40  * Meta parameter to be absorbed by the Secure OS and not passed
  41  * to the Trusted Application.
  42  *
  43  * Currently only used with OPTEE_MSG_CMD_OPEN_SESSION.
  44  */
  45 #define OPTEE_MSG_ATTR_META                     BIT(8)
  46
  47 /*
  48  * Pointer to a list of pages used to register user-defined SHM buffer.
  49  * Used with OPTEE_MSG_ATTR_TYPE_TMEM_*.
  50  * buf_ptr should point to the beginning of the buffer. Buffer will contain
  51  * list of page addresses. OP-TEE core can reconstruct contiguous buffer from
  52  * that page addresses list. Page addresses are stored as 64 bit values.
  53  * Last entry on a page should point to the next page of buffer.
  54  * Every entry in buffer should point to a 4k page beginning (12 least
  55  * significant bits must be equal to zero).
  56  *
  57  * 12 least significant bints of optee_msg_param.u.tmem.buf_ptr should hold page
  58  * offset of the user buffer.
  59  *
  60  * So, entries should be placed like members of this structure:
  61  *
  62  * struct page_data {
  63  *   uint64_t pages_array[OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1];
  64  *   uint64_t next_page_data;
  65  * };
  66  *
  67  * Structure is designed to exactly fit into the page size
  68  * OPTEE_MSG_NONCONTIG_PAGE_SIZE which is a standard 4KB page.
  69  *
  70  * The size of 4KB is chosen because this is the smallest page size for ARM
  71  * architectures. If REE uses larger pages, it should divide them to 4KB ones.
  72  */
  73 #define OPTEE_MSG_ATTR_NONCONTIG                BIT(9)
  74
  75 /*
  76  * Memory attributes for caching passed with temp memrefs. The actual value
  77  * used is defined outside the message protocol with the exception of
  78  * OPTEE_MSG_ATTR_CACHE_PREDEFINED which means the attributes already
  79  * defined for the memory range should be used. If optee_smc.h is used as
  80  * bearer of this protocol OPTEE_SMC_SHM_* is used for values.
  81  */
  82 #define OPTEE_MSG_ATTR_CACHE_SHIFT              16
  83 #define OPTEE_MSG_ATTR_CACHE_MASK               GENMASK(2, 0)
  84 #define OPTEE_MSG_ATTR_CACHE_PREDEFINED         0
  85
  86 /*
  87  * Same values as TEE_LOGIN_* from TEE Internal API
  88  */
  89 #define OPTEE_MSG_LOGIN_PUBLIC                  0x00000000
  90 #define OPTEE_MSG_LOGIN_USER                    0x00000001
  91 #define OPTEE_MSG_LOGIN_GROUP                   0x00000002
  92 #define OPTEE_MSG_LOGIN_APPLICATION             0x00000004
  93 #define OPTEE_MSG_LOGIN_APPLICATION_USER        0x00000005
  94 #define OPTEE_MSG_LOGIN_APPLICATION_GROUP       0x00000006
  95
  96 /*
  97  * Page size used in non-contiguous buffer entries
  98  */
  99 #define OPTEE_MSG_NONCONTIG_PAGE_SIZE           4096
 100
 101 /**
 102  * struct optee_msg_param_tmem - temporary memory reference parameter
 103  * @buf_ptr:    Address of the buffer
 104  * @size:       Size of the buffer
 105  * @shm_ref:    Temporary shared memory reference, pointer to a struct tee_shm
 106  *
 107  * Secure and normal world communicates pointers as physical address
 108  * instead of the virtual address. This is because secure and normal world
 109  * have completely independent memory mapping. Normal world can even have a
 110  * hypervisor which need to translate the guest physical address (AKA IPA
 111  * in ARM documentation) to a real physical address before passing the
 112  * structure to secure world.
 113  */
 114 struct optee_msg_param_tmem {
 115         u64 buf_ptr;
 116         u64 size;
 117         u64 shm_ref;
 118 };
 119
 120 /**
 121  * struct optee_msg_param_rmem - registered memory reference parameter
 122  * @offs:       Offset into shared memory reference
 123  * @size:       Size of the buffer
 124  * @shm_ref:    Shared memory reference, pointer to a struct tee_shm
 125  */
 126 struct optee_msg_param_rmem {
 127         u64 offs;
 128         u64 size;
 129         u64 shm_ref;
 130 };
 131
 132 /**
 133  * struct optee_msg_param_value - opaque value parameter
 134  *
 135  * Value parameters are passed unchecked between normal and secure world.
 136  */
 137 struct optee_msg_param_value {
 138         u64 a;
 139         u64 b;
 140         u64 c;
 141 };
 142
 143 /**
 144  * struct optee_msg_param - parameter used together with struct optee_msg_arg
 145  * @attr:       attributes
 146  * @tmem:       parameter by temporary memory reference
 147  * @rmem:       parameter by registered memory reference
 148  * @value:      parameter by opaque value
 149  *
 150  * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
 151  * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value,
 152  * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
 153  * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
 154  * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
 155  */
 156 struct optee_msg_param {
 157         u64 attr;
 158         union {
 159                 struct optee_msg_param_tmem tmem;
 160                 struct optee_msg_param_rmem rmem;
 161                 struct optee_msg_param_value value;
 162         } u;
 163 };
 164
 165 /**
 166  * struct optee_msg_arg - call argument
 167  * @cmd: Command, one of OPTEE_MSG_CMD_* or OPTEE_MSG_RPC_CMD_*
 168  * @func: Trusted Application function, specific to the Trusted Application,
 169  *           used if cmd == OPTEE_MSG_CMD_INVOKE_COMMAND
 170  * @session: In parameter for all OPTEE_MSG_CMD_* except
 171  *           OPTEE_MSG_CMD_OPEN_SESSION where it's an output parameter instead
 172  * @cancel_id: Cancellation id, a unique value to identify this request
 173  * @ret: return value
 174  * @ret_origin: origin of the return value
 175  * @num_params: number of parameters supplied to the OS Command
 176  * @params: the parameters supplied to the OS Command
 177  *
 178  * All normal calls to Trusted OS uses this struct. If cmd requires further
 179  * information than what these field holds it can be passed as a parameter
 180  * tagged as meta (setting the OPTEE_MSG_ATTR_META bit in corresponding
 181  * attrs field). All parameters tagged as meta has to come first.
 182  *
 183  * Temp memref parameters can be fragmented if supported by the Trusted OS
 184  * (when optee_smc.h is bearer of this protocol this is indicated with
 185  * OPTEE_SMC_SEC_CAP_UNREGISTERED_SHM). If a logical memref parameter is
 186  * fragmented then has all but the last fragment the
 187  * OPTEE_MSG_ATTR_FRAGMENT bit set in attrs. Even if a memref is fragmented
 188  * it will still be presented as a single logical memref to the Trusted
 189  * Application.
 190  */
 191 struct optee_msg_arg {
 192         u32 cmd;
 193         u32 func;
 194         u32 session;
 195         u32 cancel_id;
 196         u32 pad;
 197         u32 ret;
 198         u32 ret_origin;
 199         u32 num_params;
 200
 201         /* num_params tells the actual number of element in params */
 202         struct optee_msg_param params[0];
 203 };
 204
 205 /**
 206  * OPTEE_MSG_GET_ARG_SIZE - return size of struct optee_msg_arg
 207  *
 208  * @num_params: Number of parameters embedded in the struct optee_msg_arg
 209  *
 210  * Returns the size of the struct optee_msg_arg together with the number
 211  * of embedded parameters.
 212  */
 213 #define OPTEE_MSG_GET_ARG_SIZE(num_params) \
 214         (sizeof(struct optee_msg_arg) + \
 215          sizeof(struct optee_msg_param) * (num_params))
 216
 217 /*****************************************************************************
 218  * Part 2 - requests from normal world
 219  *****************************************************************************/
 220
 221 /*
 222  * Return the following UID if using API specified in this file without
 223  * further extensions:
 224  * 384fb3e0-e7f8-11e3-af63-0002a5d5c51b.
 225  * Represented in 4 32-bit words in OPTEE_MSG_UID_0, OPTEE_MSG_UID_1,
 226  * OPTEE_MSG_UID_2, OPTEE_MSG_UID_3.
 227  */
 228 #define OPTEE_MSG_UID_0                 0x384fb3e0
 229 #define OPTEE_MSG_UID_1                 0xe7f811e3
 230 #define OPTEE_MSG_UID_2                 0xaf630002
 231 #define OPTEE_MSG_UID_3                 0xa5d5c51b
 232 #define OPTEE_MSG_FUNCID_CALLS_UID      0xFF01
 233
 234 /*
 235  * Returns 2.0 if using API specified in this file without further
 236  * extensions. Represented in 2 32-bit words in OPTEE_MSG_REVISION_MAJOR
 237  * and OPTEE_MSG_REVISION_MINOR
 238  */
 239 #define OPTEE_MSG_REVISION_MAJOR        2
 240 #define OPTEE_MSG_REVISION_MINOR        0
 241 #define OPTEE_MSG_FUNCID_CALLS_REVISION 0xFF03
 242
 243 /*
 244  * Get UUID of Trusted OS.
 245  *
 246  * Used by non-secure world to figure out which Trusted OS is installed.
 247  * Note that returned UUID is the UUID of the Trusted OS, not of the API.
 248  *
 249  * Returns UUID in 4 32-bit words in the same way as
 250  * OPTEE_MSG_FUNCID_CALLS_UID described above.
 251  */
 252 #define OPTEE_MSG_OS_OPTEE_UUID_0       0x486178e0
 253 #define OPTEE_MSG_OS_OPTEE_UUID_1       0xe7f811e3
 254 #define OPTEE_MSG_OS_OPTEE_UUID_2       0xbc5e0002
 255 #define OPTEE_MSG_OS_OPTEE_UUID_3       0xa5d5c51b
 256 #define OPTEE_MSG_FUNCID_GET_OS_UUID    0x0000
 257
 258 /*
 259  * Get revision of Trusted OS.
 260  *
 261  * Used by non-secure world to figure out which version of the Trusted OS
 262  * is installed. Note that the returned revision is the revision of the
 263  * Trusted OS, not of the API.
 264  *
 265  * Returns revision in 2 32-bit words in the same way as
 266  * OPTEE_MSG_CALLS_REVISION described above.
 267  */
 268 #define OPTEE_MSG_FUNCID_GET_OS_REVISION        0x0001
 269
 270 /*
 271  * Do a secure call with struct optee_msg_arg as argument
 272  * The OPTEE_MSG_CMD_* below defines what goes in struct optee_msg_arg::cmd
 273  *
 274  * OPTEE_MSG_CMD_OPEN_SESSION opens a session to a Trusted Application.
 275  * The first two parameters are tagged as meta, holding two value
 276  * parameters to pass the following information:
 277  * param[0].u.value.a-b uuid of Trusted Application
 278  * param[1].u.value.a-b uuid of Client
 279  * param[1].u.value.c Login class of client OPTEE_MSG_LOGIN_*
 280  *
 281  * OPTEE_MSG_CMD_INVOKE_COMMAND invokes a command a previously opened
 282  * session to a Trusted Application.  struct optee_msg_arg::func is Trusted
 283  * Application function, specific to the Trusted Application.
 284  *
 285  * OPTEE_MSG_CMD_CLOSE_SESSION closes a previously opened session to
 286  * Trusted Application.
 287  *
 288  * OPTEE_MSG_CMD_CANCEL cancels a currently invoked command.
 289  *
 290  * OPTEE_MSG_CMD_REGISTER_SHM registers a shared memory reference. The
 291  * information is passed as:
 292  * [in] param[0].attr                   OPTEE_MSG_ATTR_TYPE_TMEM_INPUT
 293  *                                      [| OPTEE_MSG_ATTR_FRAGMENT]
 294  * [in] param[0].u.tmem.buf_ptr         physical address (of first fragment)
 295  * [in] param[0].u.tmem.size            size (of first fragment)
 296  * [in] param[0].u.tmem.shm_ref         holds shared memory reference
 297  * ...
 298  * The shared memory can optionally be fragmented, temp memrefs can follow
 299  * each other with all but the last with the OPTEE_MSG_ATTR_FRAGMENT bit set.
 300  *
 301  * OPTEE_MSG_CMD_UNREGISTER_SHM unregisteres a previously registered shared
 302  * memory reference. The information is passed as:
 303  * [in] param[0].attr                   OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
 304  * [in] param[0].u.rmem.shm_ref         holds shared memory reference
 305  * [in] param[0].u.rmem.offs            0
 306  * [in] param[0].u.rmem.size            0
 307  */
 308 #define OPTEE_MSG_CMD_OPEN_SESSION      0
 309 #define OPTEE_MSG_CMD_INVOKE_COMMAND    1
 310 #define OPTEE_MSG_CMD_CLOSE_SESSION     2
 311 #define OPTEE_MSG_CMD_CANCEL            3
 312 #define OPTEE_MSG_CMD_REGISTER_SHM      4
 313 #define OPTEE_MSG_CMD_UNREGISTER_SHM    5
 314 #define OPTEE_MSG_FUNCID_CALL_WITH_ARG  0x0004
 315
 316 /*****************************************************************************
 317  * Part 3 - Requests from secure world, RPC
 318  *****************************************************************************/
 319
 320 /*
 321  * All RPC is done with a struct optee_msg_arg as bearer of information,
 322  * struct optee_msg_arg::arg holds values defined by OPTEE_MSG_RPC_CMD_* below
 323  *
 324  * RPC communication with tee-supplicant is reversed compared to normal
 325  * client communication desribed above. The supplicant receives requests
 326  * and sends responses.
 327  */
 328
 329 /*
 330  * Load a TA into memory, defined in tee-supplicant
 331  */
 332 #define OPTEE_MSG_RPC_CMD_LOAD_TA       0
 333
 334 /*
 335  * Reserved
 336  */
 337 #define OPTEE_MSG_RPC_CMD_RPMB          1
 338
 339 /*
 340  * File system access, defined in tee-supplicant
 341  */
 342 #define OPTEE_MSG_RPC_CMD_FS            2
 343
 344 /*
 345  * Get time
 346  *
 347  * Returns number of seconds and nano seconds since the Epoch,
 348  * 1970-01-01 00:00:00 +0000 (UTC).
 349  *
 350  * [out] param[0].u.value.a     Number of seconds
 351  * [out] param[0].u.value.b     Number of nano seconds.
 352  */
 353 #define OPTEE_MSG_RPC_CMD_GET_TIME      3
 354
 355 /*
 356  * Wait queue primitive, helper for secure world to implement a wait queue.
 357  *
 358  * If secure world need to wait for a secure world mutex it issues a sleep
 359  * request instead of spinning in secure world. Conversely is a wakeup
 360  * request issued when a secure world mutex with a thread waiting thread is
 361  * unlocked.
 362  *
 363  * Waiting on a key
 364  * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP
 365  * [in] param[0].u.value.b wait key
 366  *
 367  * Waking up a key
 368  * [in] param[0].u.value.a OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP
 369  * [in] param[0].u.value.b wakeup key
 370  */
 371 #define OPTEE_MSG_RPC_CMD_WAIT_QUEUE    4
 372 #define OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP  0
 373 #define OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP 1
 374
 375 /*
 376  * Suspend execution
 377  *
 378  * [in] param[0].value  .a number of milliseconds to suspend
 379  */
 380 #define OPTEE_MSG_RPC_CMD_SUSPEND       5
 381
 382 /*
 383  * Allocate a piece of shared memory
 384  *
 385  * Shared memory can optionally be fragmented, to support that additional
 386  * spare param entries are allocated to make room for eventual fragments.
 387  * The spare param entries has .attr = OPTEE_MSG_ATTR_TYPE_NONE when
 388  * unused. All returned temp memrefs except the last should have the
 389  * OPTEE_MSG_ATTR_FRAGMENT bit set in the attr field.
 390  *
 391  * [in]  param[0].u.value.a             type of memory one of
 392  *                                      OPTEE_MSG_RPC_SHM_TYPE_* below
 393  * [in]  param[0].u.value.b             requested size
 394  * [in]  param[0].u.value.c             required alignment
 395  *
 396  * [out] param[0].u.tmem.buf_ptr        physical address (of first fragment)
 397  * [out] param[0].u.tmem.size           size (of first fragment)
 398  * [out] param[0].u.tmem.shm_ref        shared memory reference
 399  * ...
 400  * [out] param[n].u.tmem.buf_ptr        physical address
 401  * [out] param[n].u.tmem.size           size
 402  * [out] param[n].u.tmem.shm_ref        shared memory reference (same value
 403  *                                      as in param[n-1].u.tmem.shm_ref)
 404  */
 405 #define OPTEE_MSG_RPC_CMD_SHM_ALLOC     6
 406 /* Memory that can be shared with a non-secure user space application */
 407 #define OPTEE_MSG_RPC_SHM_TYPE_APPL     0
 408 /* Memory only shared with non-secure kernel */
 409 #define OPTEE_MSG_RPC_SHM_TYPE_KERNEL   1
 410
 411 /*
 412  * Free shared memory previously allocated with OPTEE_MSG_RPC_CMD_SHM_ALLOC
 413  *
 414  * [in]  param[0].u.value.a             type of memory one of
 415  *                                      OPTEE_MSG_RPC_SHM_TYPE_* above
 416  * [in]  param[0].u.value.b             value of shared memory reference
 417  *                                      returned in param[0].u.tmem.shm_ref
 418  *                                      above
 419  */
 420 #define OPTEE_MSG_RPC_CMD_SHM_FREE      7
 421
 422 /*
 423  * Access a device on an i2c bus
 424  *
 425  * [in]  param[0].u.value.a             mode: RD(0), WR(1)
 426  * [in]  param[0].u.value.b             i2c adapter
 427  * [in]  param[0].u.value.c             i2c chip
 428  *
 429  * [in]  param[1].u.value.a             i2c control flags
 430  *
 431  * [in/out] memref[2]                   buffer to exchange the transfer data
 432  *                                      with the secure world
 433  *
 434  * [out]  param[3].u.value.a            bytes transferred by the driver
 435  */
 436 #define OPTEE_MSG_RPC_CMD_I2C_TRANSFER 21
 437 /* I2C master transfer modes */
 438 #define OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD 0
 439 #define OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR 1
 440 /* I2C master control flags */
 441 #define OPTEE_MSG_RPC_CMD_I2C_FLAGS_TEN_BIT  BIT(0)
 442
 443 #endif /* _OPTEE_MSG_H */