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