drivers/tee/optee/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, Linaro Limited
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/arm-smccc.h>
   9 #include <linux/errno.h>
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/string.h>
  17 #include <linux/tee_drv.h>
  18 #include <linux/types.h>
  19 #include <linux/uaccess.h>
  20 #include "optee_private.h"
  21 #include "optee_smc.h"
  22 #include "shm_pool.h"
  23
  24 #define DRIVER_NAME "optee"
  25
  26 #define OPTEE_SHM_NUM_PRIV_PAGES        CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
  27
  28 /**
  29  * optee_from_msg_param() - convert from OPTEE_MSG parameters to
  30  *                          struct tee_param
  31  * @params:     subsystem internal parameter representation
  32  * @num_params: number of elements in the parameter arrays
  33  * @msg_params: OPTEE_MSG parameters
  34  * Returns 0 on success or <0 on failure
  35  */
  36 int optee_from_msg_param(struct tee_param *params, size_t num_params,
  37                          const struct optee_msg_param *msg_params)
  38 {
  39         int rc;
  40         size_t n;
  41         struct tee_shm *shm;
  42         phys_addr_t pa;
  43
  44         for (n = 0; n < num_params; n++) {
  45                 struct tee_param *p = params + n;
  46                 const struct optee_msg_param *mp = msg_params + n;
  47                 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
  48
  49                 switch (attr) {
  50                 case OPTEE_MSG_ATTR_TYPE_NONE:
  51                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
  52                         memset(&p->u, 0, sizeof(p->u));
  53                         break;
  54                 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
  55                 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
  56                 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
  57                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
  58                                   attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
  59                         p->u.value.a = mp->u.value.a;
  60                         p->u.value.b = mp->u.value.b;
  61                         p->u.value.c = mp->u.value.c;
  62                         break;
  63                 case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
  64                 case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
  65                 case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
  66                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
  67                                   attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
  68                         p->u.memref.size = mp->u.tmem.size;
  69                         shm = (struct tee_shm *)(unsigned long)
  70                                 mp->u.tmem.shm_ref;
  71                         if (!shm) {
  72                                 p->u.memref.shm_offs = 0;
  73                                 p->u.memref.shm = NULL;
  74                                 break;
  75                         }
  76                         rc = tee_shm_get_pa(shm, 0, &pa);
  77                         if (rc)
  78                                 return rc;
  79                         p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
  80                         p->u.memref.shm = shm;
  81
  82                         /* Check that the memref is covered by the shm object */
  83                         if (p->u.memref.size) {
  84                                 size_t o = p->u.memref.shm_offs +
  85                                            p->u.memref.size - 1;
  86
  87                                 rc = tee_shm_get_pa(shm, o, NULL);
  88                                 if (rc)
  89                                         return rc;
  90                         }
  91                         break;
  92                 case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
  93                 case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
  94                 case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
  95                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
  96                                   attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
  97                         p->u.memref.size = mp->u.rmem.size;
  98                         shm = (struct tee_shm *)(unsigned long)
  99                                 mp->u.rmem.shm_ref;
 100
 101                         if (!shm) {
 102                                 p->u.memref.shm_offs = 0;
 103                                 p->u.memref.shm = NULL;
 104                                 break;
 105                         }
 106                         p->u.memref.shm_offs = mp->u.rmem.offs;
 107                         p->u.memref.shm = shm;
 108
 109                         break;
 110
 111                 default:
 112                         return -EINVAL;
 113                 }
 114         }
 115         return 0;
 116 }
 117
 118 static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
 119                                 const struct tee_param *p)
 120 {
 121         int rc;
 122         phys_addr_t pa;
 123
 124         mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
 125                    TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
 126
 127         mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
 128         mp->u.tmem.size = p->u.memref.size;
 129
 130         if (!p->u.memref.shm) {
 131                 mp->u.tmem.buf_ptr = 0;
 132                 return 0;
 133         }
 134
 135         rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
 136         if (rc)
 137                 return rc;
 138
 139         mp->u.tmem.buf_ptr = pa;
 140         mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
 141                     OPTEE_MSG_ATTR_CACHE_SHIFT;
 142
 143         return 0;
 144 }
 145
 146 static int to_msg_param_reg_mem(struct optee_msg_param *mp,
 147                                 const struct tee_param *p)
 148 {
 149         mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
 150                    TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
 151
 152         mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
 153         mp->u.rmem.size = p->u.memref.size;
 154         mp->u.rmem.offs = p->u.memref.shm_offs;
 155         return 0;
 156 }
 157
 158 /**
 159  * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
 160  * @msg_params: OPTEE_MSG parameters
 161  * @num_params: number of elements in the parameter arrays
 162  * @params:     subsystem itnernal parameter representation
 163  * Returns 0 on success or <0 on failure
 164  */
 165 int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
 166                        const struct tee_param *params)
 167 {
 168         int rc;
 169         size_t n;
 170
 171         for (n = 0; n < num_params; n++) {
 172                 const struct tee_param *p = params + n;
 173                 struct optee_msg_param *mp = msg_params + n;
 174
 175                 switch (p->attr) {
 176                 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
 177                         mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
 178                         memset(&mp->u, 0, sizeof(mp->u));
 179                         break;
 180                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
 181                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
 182                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
 183                         mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
 184                                    TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
 185                         mp->u.value.a = p->u.value.a;
 186                         mp->u.value.b = p->u.value.b;
 187                         mp->u.value.c = p->u.value.c;
 188                         break;
 189                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
 190                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
 191                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
 192                         if (tee_shm_is_registered(p->u.memref.shm))
 193                                 rc = to_msg_param_reg_mem(mp, p);
 194                         else
 195                                 rc = to_msg_param_tmp_mem(mp, p);
 196                         if (rc)
 197                                 return rc;
 198                         break;
 199                 default:
 200                         return -EINVAL;
 201                 }
 202         }
 203         return 0;
 204 }
 205
 206 static void optee_get_version(struct tee_device *teedev,
 207                               struct tee_ioctl_version_data *vers)
 208 {
 209         struct tee_ioctl_version_data v = {
 210                 .impl_id = TEE_IMPL_ID_OPTEE,
 211                 .impl_caps = TEE_OPTEE_CAP_TZ,
 212                 .gen_caps = TEE_GEN_CAP_GP,
 213         };
 214         struct optee *optee = tee_get_drvdata(teedev);
 215
 216         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 217                 v.gen_caps |= TEE_GEN_CAP_REG_MEM;
 218         *vers = v;
 219 }
 220
 221 static int optee_open(struct tee_context *ctx)
 222 {
 223         struct optee_context_data *ctxdata;
 224         struct tee_device *teedev = ctx->teedev;
 225         struct optee *optee = tee_get_drvdata(teedev);
 226
 227         ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
 228         if (!ctxdata)
 229                 return -ENOMEM;
 230
 231         if (teedev == optee->supp_teedev) {
 232                 bool busy = true;
 233
 234                 mutex_lock(&optee->supp.mutex);
 235                 if (!optee->supp.ctx) {
 236                         busy = false;
 237                         optee->supp.ctx = ctx;
 238                 }
 239                 mutex_unlock(&optee->supp.mutex);
 240                 if (busy) {
 241                         kfree(ctxdata);
 242                         return -EBUSY;
 243                 }
 244         }
 245
 246         mutex_init(&ctxdata->mutex);
 247         INIT_LIST_HEAD(&ctxdata->sess_list);
 248
 249         ctx->data = ctxdata;
 250         return 0;
 251 }
 252
 253 static void optee_release(struct tee_context *ctx)
 254 {
 255         struct optee_context_data *ctxdata = ctx->data;
 256         struct tee_device *teedev = ctx->teedev;
 257         struct optee *optee = tee_get_drvdata(teedev);
 258         struct tee_shm *shm;
 259         struct optee_msg_arg *arg = NULL;
 260         phys_addr_t parg;
 261         struct optee_session *sess;
 262         struct optee_session *sess_tmp;
 263
 264         if (!ctxdata)
 265                 return;
 266
 267         shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
 268         if (!IS_ERR(shm)) {
 269                 arg = tee_shm_get_va(shm, 0);
 270                 /*
 271                  * If va2pa fails for some reason, we can't call into
 272                  * secure world, only free the memory. Secure OS will leak
 273                  * sessions and finally refuse more sessions, but we will
 274                  * at least let normal world reclaim its memory.
 275                  */
 276                 if (!IS_ERR(arg))
 277                         if (tee_shm_va2pa(shm, arg, &parg))
 278                                 arg = NULL; /* prevent usage of parg below */
 279         }
 280
 281         list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
 282                                  list_node) {
 283                 list_del(&sess->list_node);
 284                 if (!IS_ERR_OR_NULL(arg)) {
 285                         memset(arg, 0, sizeof(*arg));
 286                         arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 287                         arg->session = sess->session_id;
 288                         optee_do_call_with_arg(ctx, parg);
 289                 }
 290                 kfree(sess);
 291         }
 292         kfree(ctxdata);
 293
 294         if (!IS_ERR(shm))
 295                 tee_shm_free(shm);
 296
 297         ctx->data = NULL;
 298
 299         if (teedev == optee->supp_teedev)
 300                 optee_supp_release(&optee->supp);
 301 }
 302
 303 static const struct tee_driver_ops optee_ops = {
 304         .get_version = optee_get_version,
 305         .open = optee_open,
 306         .release = optee_release,
 307         .open_session = optee_open_session,
 308         .close_session = optee_close_session,
 309         .invoke_func = optee_invoke_func,
 310         .cancel_req = optee_cancel_req,
 311         .shm_register = optee_shm_register,
 312         .shm_unregister = optee_shm_unregister,
 313 };
 314
 315 static const struct tee_desc optee_desc = {
 316         .name = DRIVER_NAME "-clnt",
 317         .ops = &optee_ops,
 318         .owner = THIS_MODULE,
 319 };
 320
 321 static const struct tee_driver_ops optee_supp_ops = {
 322         .get_version = optee_get_version,
 323         .open = optee_open,
 324         .release = optee_release,
 325         .supp_recv = optee_supp_recv,
 326         .supp_send = optee_supp_send,
 327         .shm_register = optee_shm_register_supp,
 328         .shm_unregister = optee_shm_unregister_supp,
 329 };
 330
 331 static const struct tee_desc optee_supp_desc = {
 332         .name = DRIVER_NAME "-supp",
 333         .ops = &optee_supp_ops,
 334         .owner = THIS_MODULE,
 335         .flags = TEE_DESC_PRIVILEGED,
 336 };
 337
 338 static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
 339 {
 340         struct arm_smccc_res res;
 341
 342         invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
 343
 344         if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
 345             res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
 346                 return true;
 347         return false;
 348 }
 349
 350 static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
 351 {
 352         union {
 353                 struct arm_smccc_res smccc;
 354                 struct optee_smc_call_get_os_revision_result result;
 355         } res = {
 356                 .result = {
 357                         .build_id = 0
 358                 }
 359         };
 360
 361         invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
 362                   &res.smccc);
 363
 364         if (res.result.build_id)
 365                 pr_info("revision %lu.%lu (%08lx)", res.result.major,
 366                         res.result.minor, res.result.build_id);
 367         else
 368                 pr_info("revision %lu.%lu", res.result.major, res.result.minor);
 369 }
 370
 371 static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
 372 {
 373         union {
 374                 struct arm_smccc_res smccc;
 375                 struct optee_smc_calls_revision_result result;
 376         } res;
 377
 378         invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 379
 380         if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
 381             (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
 382                 return true;
 383         return false;
 384 }
 385
 386 static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
 387                                             u32 *sec_caps)
 388 {
 389         union {
 390                 struct arm_smccc_res smccc;
 391                 struct optee_smc_exchange_capabilities_result result;
 392         } res;
 393         u32 a1 = 0;
 394
 395         /*
 396          * TODO This isn't enough to tell if it's UP system (from kernel
 397          * point of view) or not, is_smp() returns the the information
 398          * needed, but can't be called directly from here.
 399          */
 400         if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
 401                 a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
 402
 403         invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
 404                   &res.smccc);
 405
 406         if (res.result.status != OPTEE_SMC_RETURN_OK)
 407                 return false;
 408
 409         *sec_caps = res.result.capabilities;
 410         return true;
 411 }
 412
 413 static struct tee_shm_pool *optee_config_dyn_shm(void)
 414 {
 415         struct tee_shm_pool_mgr *priv_mgr;
 416         struct tee_shm_pool_mgr *dmabuf_mgr;
 417         void *rc;
 418
 419         rc = optee_shm_pool_alloc_pages();
 420         if (IS_ERR(rc))
 421                 return rc;
 422         priv_mgr = rc;
 423
 424         rc = optee_shm_pool_alloc_pages();
 425         if (IS_ERR(rc)) {
 426                 tee_shm_pool_mgr_destroy(priv_mgr);
 427                 return rc;
 428         }
 429         dmabuf_mgr = rc;
 430
 431         rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
 432         if (IS_ERR(rc)) {
 433                 tee_shm_pool_mgr_destroy(priv_mgr);
 434                 tee_shm_pool_mgr_destroy(dmabuf_mgr);
 435         }
 436
 437         return rc;
 438 }
 439
 440 static struct tee_shm_pool *
 441 optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
 442 {
 443         union {
 444                 struct arm_smccc_res smccc;
 445                 struct optee_smc_get_shm_config_result result;
 446         } res;
 447         unsigned long vaddr;
 448         phys_addr_t paddr;
 449         size_t size;
 450         phys_addr_t begin;
 451         phys_addr_t end;
 452         void *va;
 453         struct tee_shm_pool_mgr *priv_mgr;
 454         struct tee_shm_pool_mgr *dmabuf_mgr;
 455         void *rc;
 456         const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 457
 458         invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 459         if (res.result.status != OPTEE_SMC_RETURN_OK) {
 460                 pr_err("static shm service not available\n");
 461                 return ERR_PTR(-ENOENT);
 462         }
 463
 464         if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
 465                 pr_err("only normal cached shared memory supported\n");
 466                 return ERR_PTR(-EINVAL);
 467         }
 468
 469         begin = roundup(res.result.start, PAGE_SIZE);
 470         end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
 471         paddr = begin;
 472         size = end - begin;
 473
 474         if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
 475                 pr_err("too small shared memory area\n");
 476                 return ERR_PTR(-EINVAL);
 477         }
 478
 479         va = memremap(paddr, size, MEMREMAP_WB);
 480         if (!va) {
 481                 pr_err("shared memory ioremap failed\n");
 482                 return ERR_PTR(-EINVAL);
 483         }
 484         vaddr = (unsigned long)va;
 485
 486         rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
 487                                             3 /* 8 bytes aligned */);
 488         if (IS_ERR(rc))
 489                 goto err_memunmap;
 490         priv_mgr = rc;
 491
 492         vaddr += sz;
 493         paddr += sz;
 494         size -= sz;
 495
 496         rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
 497         if (IS_ERR(rc))
 498                 goto err_free_priv_mgr;
 499         dmabuf_mgr = rc;
 500
 501         rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
 502         if (IS_ERR(rc))
 503                 goto err_free_dmabuf_mgr;
 504
 505         *memremaped_shm = va;
 506
 507         return rc;
 508
 509 err_free_dmabuf_mgr:
 510         tee_shm_pool_mgr_destroy(dmabuf_mgr);
 511 err_free_priv_mgr:
 512         tee_shm_pool_mgr_destroy(priv_mgr);
 513 err_memunmap:
 514         memunmap(va);
 515         return rc;
 516 }
 517
 518 /* Simple wrapper functions to be able to use a function pointer */
 519 static void optee_smccc_smc(unsigned long a0, unsigned long a1,
 520                             unsigned long a2, unsigned long a3,
 521                             unsigned long a4, unsigned long a5,
 522                             unsigned long a6, unsigned long a7,
 523                             struct arm_smccc_res *res)
 524 {
 525         arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 526 }
 527
 528 static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
 529                             unsigned long a2, unsigned long a3,
 530                             unsigned long a4, unsigned long a5,
 531                             unsigned long a6, unsigned long a7,
 532                             struct arm_smccc_res *res)
 533 {
 534         arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 535 }
 536
 537 static optee_invoke_fn *get_invoke_func(struct device *dev)
 538 {
 539         const char *method;
 540
 541         pr_info("probing for conduit method.\n");
 542
 543         if (device_property_read_string(dev, "method", &method)) {
 544                 pr_warn("missing \"method\" property\n");
 545                 return ERR_PTR(-ENXIO);
 546         }
 547
 548         if (!strcmp("hvc", method))
 549                 return optee_smccc_hvc;
 550         else if (!strcmp("smc", method))
 551                 return optee_smccc_smc;
 552
 553         pr_warn("invalid \"method\" property: %s\n", method);
 554         return ERR_PTR(-EINVAL);
 555 }
 556
 557 static int optee_remove(struct platform_device *pdev)
 558 {
 559         struct optee *optee = platform_get_drvdata(pdev);
 560
 561         /*
 562          * Ask OP-TEE to free all cached shared memory objects to decrease
 563          * reference counters and also avoid wild pointers in secure world
 564          * into the old shared memory range.
 565          */
 566         optee_disable_shm_cache(optee);
 567
 568         /*
 569          * The two devices have to be unregistered before we can free the
 570          * other resources.
 571          */
 572         tee_device_unregister(optee->supp_teedev);
 573         tee_device_unregister(optee->teedev);
 574
 575         tee_shm_pool_free(optee->pool);
 576         if (optee->memremaped_shm)
 577                 memunmap(optee->memremaped_shm);
 578         optee_wait_queue_exit(&optee->wait_queue);
 579         optee_supp_uninit(&optee->supp);
 580         mutex_destroy(&optee->call_queue.mutex);
 581
 582         kfree(optee);
 583
 584         return 0;
 585 }
 586
 587 static int optee_probe(struct platform_device *pdev)
 588 {
 589         optee_invoke_fn *invoke_fn;
 590         struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
 591         struct optee *optee = NULL;
 592         void *memremaped_shm = NULL;
 593         struct tee_device *teedev;
 594         u32 sec_caps;
 595         int rc;
 596
 597         invoke_fn = get_invoke_func(&pdev->dev);
 598         if (IS_ERR(invoke_fn))
 599                 return PTR_ERR(invoke_fn);
 600
 601         if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
 602                 pr_warn("api uid mismatch\n");
 603                 return -EINVAL;
 604         }
 605
 606         optee_msg_get_os_revision(invoke_fn);
 607
 608         if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
 609                 pr_warn("api revision mismatch\n");
 610                 return -EINVAL;
 611         }
 612
 613         if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
 614                 pr_warn("capabilities mismatch\n");
 615                 return -EINVAL;
 616         }
 617
 618         /*
 619          * Try to use dynamic shared memory if possible
 620          */
 621         if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 622                 pool = optee_config_dyn_shm();
 623
 624         /*
 625          * If dynamic shared memory is not available or failed - try static one
 626          */
 627         if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
 628                 pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
 629
 630         if (IS_ERR(pool))
 631                 return PTR_ERR(pool);
 632
 633         optee = kzalloc(sizeof(*optee), GFP_KERNEL);
 634         if (!optee) {
 635                 rc = -ENOMEM;
 636                 goto err;
 637         }
 638
 639         optee->invoke_fn = invoke_fn;
 640         optee->sec_caps = sec_caps;
 641
 642         teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
 643         if (IS_ERR(teedev)) {
 644                 rc = PTR_ERR(teedev);
 645                 goto err;
 646         }
 647         optee->teedev = teedev;
 648
 649         teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
 650         if (IS_ERR(teedev)) {
 651                 rc = PTR_ERR(teedev);
 652                 goto err;
 653         }
 654         optee->supp_teedev = teedev;
 655
 656         rc = tee_device_register(optee->teedev);
 657         if (rc)
 658                 goto err;
 659
 660         rc = tee_device_register(optee->supp_teedev);
 661         if (rc)
 662                 goto err;
 663
 664         mutex_init(&optee->call_queue.mutex);
 665         INIT_LIST_HEAD(&optee->call_queue.waiters);
 666         optee_wait_queue_init(&optee->wait_queue);
 667         optee_supp_init(&optee->supp);
 668         optee->memremaped_shm = memremaped_shm;
 669         optee->pool = pool;
 670
 671         optee_enable_shm_cache(optee);
 672
 673         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 674                 pr_info("dynamic shared memory is enabled\n");
 675
 676         platform_set_drvdata(pdev, optee);
 677
 678         rc = optee_enumerate_devices();
 679         if (rc) {
 680                 optee_remove(pdev);
 681                 return rc;
 682         }
 683
 684         pr_info("initialized driver\n");
 685         return 0;
 686 err:
 687         if (optee) {
 688                 /*
 689                  * tee_device_unregister() is safe to call even if the
 690                  * devices hasn't been registered with
 691                  * tee_device_register() yet.
 692                  */
 693                 tee_device_unregister(optee->supp_teedev);
 694                 tee_device_unregister(optee->teedev);
 695                 kfree(optee);
 696         }
 697         if (pool)
 698                 tee_shm_pool_free(pool);
 699         if (memremaped_shm)
 700                 memunmap(memremaped_shm);
 701         return rc;
 702 }
 703
 704 static const struct of_device_id optee_dt_match[] = {
 705         { .compatible = "linaro,optee-tz" },
 706         {},
 707 };
 708 MODULE_DEVICE_TABLE(of, optee_dt_match);
 709
 710 static struct platform_driver optee_driver = {
 711         .probe  = optee_probe,
 712         .remove = optee_remove,
 713         .driver = {
 714                 .name = "optee",
 715                 .of_match_table = optee_dt_match,
 716         },
 717 };
 718 module_platform_driver(optee_driver);
 719
 720 MODULE_AUTHOR("Linaro");
 721 MODULE_DESCRIPTION("OP-TEE driver");
 722 MODULE_SUPPORTED_DEVICE("");
 723 MODULE_VERSION("1.0");
 724 MODULE_LICENSE("GPL v2");
 725 MODULE_ALIAS("platform:optee");