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 <linux/workqueue.h>
  21 #include "optee_private.h"
  22 #include "optee_smc.h"
  23 #include "shm_pool.h"
  24
  25 #define DRIVER_NAME "optee"
  26
  27 #define OPTEE_SHM_NUM_PRIV_PAGES        CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
  28
  29 /**
  30  * optee_from_msg_param() - convert from OPTEE_MSG parameters to
  31  *                          struct tee_param
  32  * @params:     subsystem internal parameter representation
  33  * @num_params: number of elements in the parameter arrays
  34  * @msg_params: OPTEE_MSG parameters
  35  * Returns 0 on success or <0 on failure
  36  */
  37 int optee_from_msg_param(struct tee_param *params, size_t num_params,
  38                          const struct optee_msg_param *msg_params)
  39 {
  40         int rc;
  41         size_t n;
  42         struct tee_shm *shm;
  43         phys_addr_t pa;
  44
  45         for (n = 0; n < num_params; n++) {
  46                 struct tee_param *p = params + n;
  47                 const struct optee_msg_param *mp = msg_params + n;
  48                 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
  49
  50                 switch (attr) {
  51                 case OPTEE_MSG_ATTR_TYPE_NONE:
  52                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
  53                         memset(&p->u, 0, sizeof(p->u));
  54                         break;
  55                 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
  56                 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
  57                 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
  58                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
  59                                   attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
  60                         p->u.value.a = mp->u.value.a;
  61                         p->u.value.b = mp->u.value.b;
  62                         p->u.value.c = mp->u.value.c;
  63                         break;
  64                 case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
  65                 case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
  66                 case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
  67                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
  68                                   attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
  69                         p->u.memref.size = mp->u.tmem.size;
  70                         shm = (struct tee_shm *)(unsigned long)
  71                                 mp->u.tmem.shm_ref;
  72                         if (!shm) {
  73                                 p->u.memref.shm_offs = 0;
  74                                 p->u.memref.shm = NULL;
  75                                 break;
  76                         }
  77                         rc = tee_shm_get_pa(shm, 0, &pa);
  78                         if (rc)
  79                                 return rc;
  80                         p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
  81                         p->u.memref.shm = shm;
  82
  83                         /* Check that the memref is covered by the shm object */
  84                         if (p->u.memref.size) {
  85                                 size_t o = p->u.memref.shm_offs +
  86                                            p->u.memref.size - 1;
  87
  88                                 rc = tee_shm_get_pa(shm, o, NULL);
  89                                 if (rc)
  90                                         return rc;
  91                         }
  92                         break;
  93                 case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
  94                 case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
  95                 case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
  96                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
  97                                   attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
  98                         p->u.memref.size = mp->u.rmem.size;
  99                         shm = (struct tee_shm *)(unsigned long)
 100                                 mp->u.rmem.shm_ref;
 101
 102                         if (!shm) {
 103                                 p->u.memref.shm_offs = 0;
 104                                 p->u.memref.shm = NULL;
 105                                 break;
 106                         }
 107                         p->u.memref.shm_offs = mp->u.rmem.offs;
 108                         p->u.memref.shm = shm;
 109
 110                         break;
 111
 112                 default:
 113                         return -EINVAL;
 114                 }
 115         }
 116         return 0;
 117 }
 118
 119 static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
 120                                 const struct tee_param *p)
 121 {
 122         int rc;
 123         phys_addr_t pa;
 124
 125         mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
 126                    TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
 127
 128         mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
 129         mp->u.tmem.size = p->u.memref.size;
 130
 131         if (!p->u.memref.shm) {
 132                 mp->u.tmem.buf_ptr = 0;
 133                 return 0;
 134         }
 135
 136         rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
 137         if (rc)
 138                 return rc;
 139
 140         mp->u.tmem.buf_ptr = pa;
 141         mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
 142                     OPTEE_MSG_ATTR_CACHE_SHIFT;
 143
 144         return 0;
 145 }
 146
 147 static int to_msg_param_reg_mem(struct optee_msg_param *mp,
 148                                 const struct tee_param *p)
 149 {
 150         mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
 151                    TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
 152
 153         mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
 154         mp->u.rmem.size = p->u.memref.size;
 155         mp->u.rmem.offs = p->u.memref.shm_offs;
 156         return 0;
 157 }
 158
 159 /**
 160  * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
 161  * @msg_params: OPTEE_MSG parameters
 162  * @num_params: number of elements in the parameter arrays
 163  * @params:     subsystem itnernal parameter representation
 164  * Returns 0 on success or <0 on failure
 165  */
 166 int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
 167                        const struct tee_param *params)
 168 {
 169         int rc;
 170         size_t n;
 171
 172         for (n = 0; n < num_params; n++) {
 173                 const struct tee_param *p = params + n;
 174                 struct optee_msg_param *mp = msg_params + n;
 175
 176                 switch (p->attr) {
 177                 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
 178                         mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
 179                         memset(&mp->u, 0, sizeof(mp->u));
 180                         break;
 181                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
 182                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
 183                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
 184                         mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
 185                                    TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
 186                         mp->u.value.a = p->u.value.a;
 187                         mp->u.value.b = p->u.value.b;
 188                         mp->u.value.c = p->u.value.c;
 189                         break;
 190                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
 191                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
 192                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
 193                         if (tee_shm_is_registered(p->u.memref.shm))
 194                                 rc = to_msg_param_reg_mem(mp, p);
 195                         else
 196                                 rc = to_msg_param_tmp_mem(mp, p);
 197                         if (rc)
 198                                 return rc;
 199                         break;
 200                 default:
 201                         return -EINVAL;
 202                 }
 203         }
 204         return 0;
 205 }
 206
 207 static void optee_get_version(struct tee_device *teedev,
 208                               struct tee_ioctl_version_data *vers)
 209 {
 210         struct tee_ioctl_version_data v = {
 211                 .impl_id = TEE_IMPL_ID_OPTEE,
 212                 .impl_caps = TEE_OPTEE_CAP_TZ,
 213                 .gen_caps = TEE_GEN_CAP_GP,
 214         };
 215         struct optee *optee = tee_get_drvdata(teedev);
 216
 217         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 218                 v.gen_caps |= TEE_GEN_CAP_REG_MEM;
 219         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
 220                 v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
 221         *vers = v;
 222 }
 223
 224 static void optee_bus_scan(struct work_struct *work)
 225 {
 226         WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
 227 }
 228
 229 static int optee_open(struct tee_context *ctx)
 230 {
 231         struct optee_context_data *ctxdata;
 232         struct tee_device *teedev = ctx->teedev;
 233         struct optee *optee = tee_get_drvdata(teedev);
 234
 235         ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
 236         if (!ctxdata)
 237                 return -ENOMEM;
 238
 239         if (teedev == optee->supp_teedev) {
 240                 bool busy = true;
 241
 242                 mutex_lock(&optee->supp.mutex);
 243                 if (!optee->supp.ctx) {
 244                         busy = false;
 245                         optee->supp.ctx = ctx;
 246                 }
 247                 mutex_unlock(&optee->supp.mutex);
 248                 if (busy) {
 249                         kfree(ctxdata);
 250                         return -EBUSY;
 251                 }
 252
 253                 if (!optee->scan_bus_done) {
 254                         INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
 255                         optee->scan_bus_wq = create_workqueue("optee_bus_scan");
 256                         if (!optee->scan_bus_wq) {
 257                                 kfree(ctxdata);
 258                                 return -ECHILD;
 259                         }
 260                         queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
 261                         optee->scan_bus_done = true;
 262                 }
 263         }
 264         mutex_init(&ctxdata->mutex);
 265         INIT_LIST_HEAD(&ctxdata->sess_list);
 266
 267         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
 268                 ctx->cap_memref_null  = true;
 269         else
 270                 ctx->cap_memref_null = false;
 271
 272         ctx->data = ctxdata;
 273         return 0;
 274 }
 275
 276 static void optee_release(struct tee_context *ctx)
 277 {
 278         struct optee_context_data *ctxdata = ctx->data;
 279         struct tee_device *teedev = ctx->teedev;
 280         struct optee *optee = tee_get_drvdata(teedev);
 281         struct tee_shm *shm;
 282         struct optee_msg_arg *arg = NULL;
 283         phys_addr_t parg;
 284         struct optee_session *sess;
 285         struct optee_session *sess_tmp;
 286
 287         if (!ctxdata)
 288                 return;
 289
 290         shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
 291         if (!IS_ERR(shm)) {
 292                 arg = tee_shm_get_va(shm, 0);
 293                 /*
 294                  * If va2pa fails for some reason, we can't call into
 295                  * secure world, only free the memory. Secure OS will leak
 296                  * sessions and finally refuse more sessions, but we will
 297                  * at least let normal world reclaim its memory.
 298                  */
 299                 if (!IS_ERR(arg))
 300                         if (tee_shm_va2pa(shm, arg, &parg))
 301                                 arg = NULL; /* prevent usage of parg below */
 302         }
 303
 304         list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
 305                                  list_node) {
 306                 list_del(&sess->list_node);
 307                 if (!IS_ERR_OR_NULL(arg)) {
 308                         memset(arg, 0, sizeof(*arg));
 309                         arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 310                         arg->session = sess->session_id;
 311                         optee_do_call_with_arg(ctx, parg);
 312                 }
 313                 kfree(sess);
 314         }
 315         kfree(ctxdata);
 316
 317         if (!IS_ERR(shm))
 318                 tee_shm_free(shm);
 319
 320         ctx->data = NULL;
 321
 322         if (teedev == optee->supp_teedev) {
 323                 if (optee->scan_bus_wq) {
 324                         destroy_workqueue(optee->scan_bus_wq);
 325                         optee->scan_bus_wq = NULL;
 326                 }
 327                 optee_supp_release(&optee->supp);
 328         }
 329 }
 330
 331 static const struct tee_driver_ops optee_ops = {
 332         .get_version = optee_get_version,
 333         .open = optee_open,
 334         .release = optee_release,
 335         .open_session = optee_open_session,
 336         .close_session = optee_close_session,
 337         .invoke_func = optee_invoke_func,
 338         .cancel_req = optee_cancel_req,
 339         .shm_register = optee_shm_register,
 340         .shm_unregister = optee_shm_unregister,
 341 };
 342
 343 static const struct tee_desc optee_desc = {
 344         .name = DRIVER_NAME "-clnt",
 345         .ops = &optee_ops,
 346         .owner = THIS_MODULE,
 347 };
 348
 349 static const struct tee_driver_ops optee_supp_ops = {
 350         .get_version = optee_get_version,
 351         .open = optee_open,
 352         .release = optee_release,
 353         .supp_recv = optee_supp_recv,
 354         .supp_send = optee_supp_send,
 355         .shm_register = optee_shm_register_supp,
 356         .shm_unregister = optee_shm_unregister_supp,
 357 };
 358
 359 static const struct tee_desc optee_supp_desc = {
 360         .name = DRIVER_NAME "-supp",
 361         .ops = &optee_supp_ops,
 362         .owner = THIS_MODULE,
 363         .flags = TEE_DESC_PRIVILEGED,
 364 };
 365
 366 static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
 367 {
 368         struct arm_smccc_res res;
 369
 370         invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
 371
 372         if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
 373             res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
 374                 return true;
 375         return false;
 376 }
 377
 378 static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
 379 {
 380         union {
 381                 struct arm_smccc_res smccc;
 382                 struct optee_smc_call_get_os_revision_result result;
 383         } res = {
 384                 .result = {
 385                         .build_id = 0
 386                 }
 387         };
 388
 389         invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
 390                   &res.smccc);
 391
 392         if (res.result.build_id)
 393                 pr_info("revision %lu.%lu (%08lx)", res.result.major,
 394                         res.result.minor, res.result.build_id);
 395         else
 396                 pr_info("revision %lu.%lu", res.result.major, res.result.minor);
 397 }
 398
 399 static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
 400 {
 401         union {
 402                 struct arm_smccc_res smccc;
 403                 struct optee_smc_calls_revision_result result;
 404         } res;
 405
 406         invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 407
 408         if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
 409             (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
 410                 return true;
 411         return false;
 412 }
 413
 414 static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
 415                                             u32 *sec_caps)
 416 {
 417         union {
 418                 struct arm_smccc_res smccc;
 419                 struct optee_smc_exchange_capabilities_result result;
 420         } res;
 421         u32 a1 = 0;
 422
 423         /*
 424          * TODO This isn't enough to tell if it's UP system (from kernel
 425          * point of view) or not, is_smp() returns the the information
 426          * needed, but can't be called directly from here.
 427          */
 428         if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
 429                 a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
 430
 431         invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
 432                   &res.smccc);
 433
 434         if (res.result.status != OPTEE_SMC_RETURN_OK)
 435                 return false;
 436
 437         *sec_caps = res.result.capabilities;
 438         return true;
 439 }
 440
 441 static struct tee_shm_pool *optee_config_dyn_shm(void)
 442 {
 443         struct tee_shm_pool_mgr *priv_mgr;
 444         struct tee_shm_pool_mgr *dmabuf_mgr;
 445         void *rc;
 446
 447         rc = optee_shm_pool_alloc_pages();
 448         if (IS_ERR(rc))
 449                 return rc;
 450         priv_mgr = rc;
 451
 452         rc = optee_shm_pool_alloc_pages();
 453         if (IS_ERR(rc)) {
 454                 tee_shm_pool_mgr_destroy(priv_mgr);
 455                 return rc;
 456         }
 457         dmabuf_mgr = rc;
 458
 459         rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
 460         if (IS_ERR(rc)) {
 461                 tee_shm_pool_mgr_destroy(priv_mgr);
 462                 tee_shm_pool_mgr_destroy(dmabuf_mgr);
 463         }
 464
 465         return rc;
 466 }
 467
 468 static struct tee_shm_pool *
 469 optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
 470 {
 471         union {
 472                 struct arm_smccc_res smccc;
 473                 struct optee_smc_get_shm_config_result result;
 474         } res;
 475         unsigned long vaddr;
 476         phys_addr_t paddr;
 477         size_t size;
 478         phys_addr_t begin;
 479         phys_addr_t end;
 480         void *va;
 481         struct tee_shm_pool_mgr *priv_mgr;
 482         struct tee_shm_pool_mgr *dmabuf_mgr;
 483         void *rc;
 484         const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 485
 486         invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 487         if (res.result.status != OPTEE_SMC_RETURN_OK) {
 488                 pr_err("static shm service not available\n");
 489                 return ERR_PTR(-ENOENT);
 490         }
 491
 492         if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
 493                 pr_err("only normal cached shared memory supported\n");
 494                 return ERR_PTR(-EINVAL);
 495         }
 496
 497         begin = roundup(res.result.start, PAGE_SIZE);
 498         end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
 499         paddr = begin;
 500         size = end - begin;
 501
 502         if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
 503                 pr_err("too small shared memory area\n");
 504                 return ERR_PTR(-EINVAL);
 505         }
 506
 507         va = memremap(paddr, size, MEMREMAP_WB);
 508         if (!va) {
 509                 pr_err("shared memory ioremap failed\n");
 510                 return ERR_PTR(-EINVAL);
 511         }
 512         vaddr = (unsigned long)va;
 513
 514         rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
 515                                             3 /* 8 bytes aligned */);
 516         if (IS_ERR(rc))
 517                 goto err_memunmap;
 518         priv_mgr = rc;
 519
 520         vaddr += sz;
 521         paddr += sz;
 522         size -= sz;
 523
 524         rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
 525         if (IS_ERR(rc))
 526                 goto err_free_priv_mgr;
 527         dmabuf_mgr = rc;
 528
 529         rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
 530         if (IS_ERR(rc))
 531                 goto err_free_dmabuf_mgr;
 532
 533         *memremaped_shm = va;
 534
 535         return rc;
 536
 537 err_free_dmabuf_mgr:
 538         tee_shm_pool_mgr_destroy(dmabuf_mgr);
 539 err_free_priv_mgr:
 540         tee_shm_pool_mgr_destroy(priv_mgr);
 541 err_memunmap:
 542         memunmap(va);
 543         return rc;
 544 }
 545
 546 /* Simple wrapper functions to be able to use a function pointer */
 547 static void optee_smccc_smc(unsigned long a0, unsigned long a1,
 548                             unsigned long a2, unsigned long a3,
 549                             unsigned long a4, unsigned long a5,
 550                             unsigned long a6, unsigned long a7,
 551                             struct arm_smccc_res *res)
 552 {
 553         arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 554 }
 555
 556 static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
 557                             unsigned long a2, unsigned long a3,
 558                             unsigned long a4, unsigned long a5,
 559                             unsigned long a6, unsigned long a7,
 560                             struct arm_smccc_res *res)
 561 {
 562         arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 563 }
 564
 565 static optee_invoke_fn *get_invoke_func(struct device *dev)
 566 {
 567         const char *method;
 568
 569         pr_info("probing for conduit method.\n");
 570
 571         if (device_property_read_string(dev, "method", &method)) {
 572                 pr_warn("missing \"method\" property\n");
 573                 return ERR_PTR(-ENXIO);
 574         }
 575
 576         if (!strcmp("hvc", method))
 577                 return optee_smccc_hvc;
 578         else if (!strcmp("smc", method))
 579                 return optee_smccc_smc;
 580
 581         pr_warn("invalid \"method\" property: %s\n", method);
 582         return ERR_PTR(-EINVAL);
 583 }
 584
 585 static int optee_remove(struct platform_device *pdev)
 586 {
 587         struct optee *optee = platform_get_drvdata(pdev);
 588
 589         /*
 590          * Ask OP-TEE to free all cached shared memory objects to decrease
 591          * reference counters and also avoid wild pointers in secure world
 592          * into the old shared memory range.
 593          */
 594         optee_disable_shm_cache(optee);
 595
 596         /*
 597          * The two devices have to be unregistered before we can free the
 598          * other resources.
 599          */
 600         tee_device_unregister(optee->supp_teedev);
 601         tee_device_unregister(optee->teedev);
 602
 603         tee_shm_pool_free(optee->pool);
 604         if (optee->memremaped_shm)
 605                 memunmap(optee->memremaped_shm);
 606         optee_wait_queue_exit(&optee->wait_queue);
 607         optee_supp_uninit(&optee->supp);
 608         mutex_destroy(&optee->call_queue.mutex);
 609
 610         kfree(optee);
 611
 612         return 0;
 613 }
 614
 615 static int optee_probe(struct platform_device *pdev)
 616 {
 617         optee_invoke_fn *invoke_fn;
 618         struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
 619         struct optee *optee = NULL;
 620         void *memremaped_shm = NULL;
 621         struct tee_device *teedev;
 622         u32 sec_caps;
 623         int rc;
 624
 625         invoke_fn = get_invoke_func(&pdev->dev);
 626         if (IS_ERR(invoke_fn))
 627                 return PTR_ERR(invoke_fn);
 628
 629         if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
 630                 pr_warn("api uid mismatch\n");
 631                 return -EINVAL;
 632         }
 633
 634         optee_msg_get_os_revision(invoke_fn);
 635
 636         if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
 637                 pr_warn("api revision mismatch\n");
 638                 return -EINVAL;
 639         }
 640
 641         if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
 642                 pr_warn("capabilities mismatch\n");
 643                 return -EINVAL;
 644         }
 645
 646         /*
 647          * Try to use dynamic shared memory if possible
 648          */
 649         if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 650                 pool = optee_config_dyn_shm();
 651
 652         /*
 653          * If dynamic shared memory is not available or failed - try static one
 654          */
 655         if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
 656                 pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
 657
 658         if (IS_ERR(pool))
 659                 return PTR_ERR(pool);
 660
 661         optee = kzalloc(sizeof(*optee), GFP_KERNEL);
 662         if (!optee) {
 663                 rc = -ENOMEM;
 664                 goto err;
 665         }
 666
 667         optee->invoke_fn = invoke_fn;
 668         optee->sec_caps = sec_caps;
 669
 670         teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
 671         if (IS_ERR(teedev)) {
 672                 rc = PTR_ERR(teedev);
 673                 goto err;
 674         }
 675         optee->teedev = teedev;
 676
 677         teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
 678         if (IS_ERR(teedev)) {
 679                 rc = PTR_ERR(teedev);
 680                 goto err;
 681         }
 682         optee->supp_teedev = teedev;
 683
 684         rc = tee_device_register(optee->teedev);
 685         if (rc)
 686                 goto err;
 687
 688         rc = tee_device_register(optee->supp_teedev);
 689         if (rc)
 690                 goto err;
 691
 692         mutex_init(&optee->call_queue.mutex);
 693         INIT_LIST_HEAD(&optee->call_queue.waiters);
 694         optee_wait_queue_init(&optee->wait_queue);
 695         optee_supp_init(&optee->supp);
 696         optee->memremaped_shm = memremaped_shm;
 697         optee->pool = pool;
 698
 699         optee_enable_shm_cache(optee);
 700
 701         if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 702                 pr_info("dynamic shared memory is enabled\n");
 703
 704         platform_set_drvdata(pdev, optee);
 705
 706         rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
 707         if (rc) {
 708                 optee_remove(pdev);
 709                 return rc;
 710         }
 711
 712         pr_info("initialized driver\n");
 713         return 0;
 714 err:
 715         if (optee) {
 716                 /*
 717                  * tee_device_unregister() is safe to call even if the
 718                  * devices hasn't been registered with
 719                  * tee_device_register() yet.
 720                  */
 721                 tee_device_unregister(optee->supp_teedev);
 722                 tee_device_unregister(optee->teedev);
 723                 kfree(optee);
 724         }
 725         if (pool)
 726                 tee_shm_pool_free(pool);
 727         if (memremaped_shm)
 728                 memunmap(memremaped_shm);
 729         return rc;
 730 }
 731
 732 static const struct of_device_id optee_dt_match[] = {
 733         { .compatible = "linaro,optee-tz" },
 734         {},
 735 };
 736 MODULE_DEVICE_TABLE(of, optee_dt_match);
 737
 738 static struct platform_driver optee_driver = {
 739         .probe  = optee_probe,
 740         .remove = optee_remove,
 741         .driver = {
 742                 .name = "optee",
 743                 .of_match_table = optee_dt_match,
 744         },
 745 };
 746 module_platform_driver(optee_driver);
 747
 748 MODULE_AUTHOR("Linaro");
 749 MODULE_DESCRIPTION("OP-TEE driver");
 750 MODULE_SUPPORTED_DEVICE("");
 751 MODULE_VERSION("1.0");
 752 MODULE_LICENSE("GPL v2");
 753 MODULE_ALIAS("platform:optee");