drivers/tee/optee/call.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, Linaro Limited
   4  */
   5 #include <linux/arm-smccc.h>
   6 #include <linux/device.h>
   7 #include <linux/err.h>
   8 #include <linux/errno.h>
   9 #include <linux/mm.h>
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/tee_drv.h>
  13 #include <linux/types.h>
  14 #include <linux/uaccess.h>
  15 #include "optee_private.h"
  16 #include "optee_smc.h"
  17 #define CREATE_TRACE_POINTS
  18 #include "optee_trace.h"
  19
  20 struct optee_call_waiter {
  21         struct list_head list_node;
  22         struct completion c;
  23 };
  24
  25 static void optee_cq_wait_init(struct optee_call_queue *cq,
  26                                struct optee_call_waiter *w)
  27 {
  28         /*
  29          * We're preparing to make a call to secure world. In case we can't
  30          * allocate a thread in secure world we'll end up waiting in
  31          * optee_cq_wait_for_completion().
  32          *
  33          * Normally if there's no contention in secure world the call will
  34          * complete and we can cleanup directly with optee_cq_wait_final().
  35          */
  36         mutex_lock(&cq->mutex);
  37
  38         /*
  39          * We add ourselves to the queue, but we don't wait. This
  40          * guarantees that we don't lose a completion if secure world
  41          * returns busy and another thread just exited and try to complete
  42          * someone.
  43          */
  44         init_completion(&w->c);
  45         list_add_tail(&w->list_node, &cq->waiters);
  46
  47         mutex_unlock(&cq->mutex);
  48 }
  49
  50 static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
  51                                          struct optee_call_waiter *w)
  52 {
  53         wait_for_completion(&w->c);
  54
  55         mutex_lock(&cq->mutex);
  56
  57         /* Move to end of list to get out of the way for other waiters */
  58         list_del(&w->list_node);
  59         reinit_completion(&w->c);
  60         list_add_tail(&w->list_node, &cq->waiters);
  61
  62         mutex_unlock(&cq->mutex);
  63 }
  64
  65 static void optee_cq_complete_one(struct optee_call_queue *cq)
  66 {
  67         struct optee_call_waiter *w;
  68
  69         list_for_each_entry(w, &cq->waiters, list_node) {
  70                 if (!completion_done(&w->c)) {
  71                         complete(&w->c);
  72                         break;
  73                 }
  74         }
  75 }
  76
  77 static void optee_cq_wait_final(struct optee_call_queue *cq,
  78                                 struct optee_call_waiter *w)
  79 {
  80         /*
  81          * We're done with the call to secure world. The thread in secure
  82          * world that was used for this call is now available for some
  83          * other task to use.
  84          */
  85         mutex_lock(&cq->mutex);
  86
  87         /* Get out of the list */
  88         list_del(&w->list_node);
  89
  90         /* Wake up one eventual waiting task */
  91         optee_cq_complete_one(cq);
  92
  93         /*
  94          * If we're completed we've got a completion from another task that
  95          * was just done with its call to secure world. Since yet another
  96          * thread now is available in secure world wake up another eventual
  97          * waiting task.
  98          */
  99         if (completion_done(&w->c))
 100                 optee_cq_complete_one(cq);
 101
 102         mutex_unlock(&cq->mutex);
 103 }
 104
 105 /* Requires the filpstate mutex to be held */
 106 static struct optee_session *find_session(struct optee_context_data *ctxdata,
 107                                           u32 session_id)
 108 {
 109         struct optee_session *sess;
 110
 111         list_for_each_entry(sess, &ctxdata->sess_list, list_node)
 112                 if (sess->session_id == session_id)
 113                         return sess;
 114
 115         return NULL;
 116 }
 117
 118 /**
 119  * optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world
 120  * @ctx:        calling context
 121  * @parg:       physical address of message to pass to secure world
 122  *
 123  * Does and SMC to OP-TEE in secure world and handles eventual resulting
 124  * Remote Procedure Calls (RPC) from OP-TEE.
 125  *
 126  * Returns return code from secure world, 0 is OK
 127  */
 128 u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
 129 {
 130         struct optee *optee = tee_get_drvdata(ctx->teedev);
 131         struct optee_call_waiter w;
 132         struct optee_rpc_param param = { };
 133         struct optee_call_ctx call_ctx = { };
 134         u32 ret;
 135
 136         param.a0 = OPTEE_SMC_CALL_WITH_ARG;
 137         reg_pair_from_64(&param.a1, &param.a2, parg);
 138         /* Initialize waiter */
 139         optee_cq_wait_init(&optee->call_queue, &w);
 140         while (true) {
 141                 struct arm_smccc_res res;
 142
 143                 trace_optee_invoke_fn_begin(&param);
 144                 optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
 145                                  param.a4, param.a5, param.a6, param.a7,
 146                                  &res);
 147                 trace_optee_invoke_fn_end(&param, &res);
 148
 149                 if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
 150                         /*
 151                          * Out of threads in secure world, wait for a thread
 152                          * become available.
 153                          */
 154                         optee_cq_wait_for_completion(&optee->call_queue, &w);
 155                 } else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
 156                         cond_resched();
 157                         param.a0 = res.a0;
 158                         param.a1 = res.a1;
 159                         param.a2 = res.a2;
 160                         param.a3 = res.a3;
 161                         optee_handle_rpc(ctx, &param, &call_ctx);
 162                 } else {
 163                         ret = res.a0;
 164                         break;
 165                 }
 166         }
 167
 168         optee_rpc_finalize_call(&call_ctx);
 169         /*
 170          * We're done with our thread in secure world, if there's any
 171          * thread waiters wake up one.
 172          */
 173         optee_cq_wait_final(&optee->call_queue, &w);
 174
 175         return ret;
 176 }
 177
 178 static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
 179                                    struct optee_msg_arg **msg_arg,
 180                                    phys_addr_t *msg_parg)
 181 {
 182         int rc;
 183         struct tee_shm *shm;
 184         struct optee_msg_arg *ma;
 185
 186         shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params),
 187                             TEE_SHM_MAPPED);
 188         if (IS_ERR(shm))
 189                 return shm;
 190
 191         ma = tee_shm_get_va(shm, 0);
 192         if (IS_ERR(ma)) {
 193                 rc = PTR_ERR(ma);
 194                 goto out;
 195         }
 196
 197         rc = tee_shm_get_pa(shm, 0, msg_parg);
 198         if (rc)
 199                 goto out;
 200
 201         memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
 202         ma->num_params = num_params;
 203         *msg_arg = ma;
 204 out:
 205         if (rc) {
 206                 tee_shm_free(shm);
 207                 return ERR_PTR(rc);
 208         }
 209
 210         return shm;
 211 }
 212
 213 int optee_open_session(struct tee_context *ctx,
 214                        struct tee_ioctl_open_session_arg *arg,
 215                        struct tee_param *param)
 216 {
 217         struct optee_context_data *ctxdata = ctx->data;
 218         int rc;
 219         struct tee_shm *shm;
 220         struct optee_msg_arg *msg_arg;
 221         phys_addr_t msg_parg;
 222         struct optee_session *sess = NULL;
 223
 224         /* +2 for the meta parameters added below */
 225         shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
 226         if (IS_ERR(shm))
 227                 return PTR_ERR(shm);
 228
 229         msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
 230         msg_arg->cancel_id = arg->cancel_id;
 231
 232         /*
 233          * Initialize and add the meta parameters needed when opening a
 234          * session.
 235          */
 236         msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 237                                   OPTEE_MSG_ATTR_META;
 238         msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 239                                   OPTEE_MSG_ATTR_META;
 240         memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid));
 241         msg_arg->params[1].u.value.c = arg->clnt_login;
 242
 243         rc = tee_session_calc_client_uuid((uuid_t *)&msg_arg->params[1].u.value,
 244                                           arg->clnt_login, arg->clnt_uuid);
 245         if (rc)
 246                 goto out;
 247
 248         rc = optee_to_msg_param(msg_arg->params + 2, arg->num_params, param);
 249         if (rc)
 250                 goto out;
 251
 252         sess = kzalloc(sizeof(*sess), GFP_KERNEL);
 253         if (!sess) {
 254                 rc = -ENOMEM;
 255                 goto out;
 256         }
 257
 258         if (optee_do_call_with_arg(ctx, msg_parg)) {
 259                 msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 260                 msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 261         }
 262
 263         if (msg_arg->ret == TEEC_SUCCESS) {
 264                 /* A new session has been created, add it to the list. */
 265                 sess->session_id = msg_arg->session;
 266                 mutex_lock(&ctxdata->mutex);
 267                 list_add(&sess->list_node, &ctxdata->sess_list);
 268                 mutex_unlock(&ctxdata->mutex);
 269         } else {
 270                 kfree(sess);
 271         }
 272
 273         if (optee_from_msg_param(param, arg->num_params, msg_arg->params + 2)) {
 274                 arg->ret = TEEC_ERROR_COMMUNICATION;
 275                 arg->ret_origin = TEEC_ORIGIN_COMMS;
 276                 /* Close session again to avoid leakage */
 277                 optee_close_session(ctx, msg_arg->session);
 278         } else {
 279                 arg->session = msg_arg->session;
 280                 arg->ret = msg_arg->ret;
 281                 arg->ret_origin = msg_arg->ret_origin;
 282         }
 283 out:
 284         tee_shm_free(shm);
 285
 286         return rc;
 287 }
 288
 289 int optee_close_session(struct tee_context *ctx, u32 session)
 290 {
 291         struct optee_context_data *ctxdata = ctx->data;
 292         struct tee_shm *shm;
 293         struct optee_msg_arg *msg_arg;
 294         phys_addr_t msg_parg;
 295         struct optee_session *sess;
 296
 297         /* Check that the session is valid and remove it from the list */
 298         mutex_lock(&ctxdata->mutex);
 299         sess = find_session(ctxdata, session);
 300         if (sess)
 301                 list_del(&sess->list_node);
 302         mutex_unlock(&ctxdata->mutex);
 303         if (!sess)
 304                 return -EINVAL;
 305         kfree(sess);
 306
 307         shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
 308         if (IS_ERR(shm))
 309                 return PTR_ERR(shm);
 310
 311         msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 312         msg_arg->session = session;
 313         optee_do_call_with_arg(ctx, msg_parg);
 314
 315         tee_shm_free(shm);
 316         return 0;
 317 }
 318
 319 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
 320                       struct tee_param *param)
 321 {
 322         struct optee_context_data *ctxdata = ctx->data;
 323         struct tee_shm *shm;
 324         struct optee_msg_arg *msg_arg;
 325         phys_addr_t msg_parg;
 326         struct optee_session *sess;
 327         int rc;
 328
 329         /* Check that the session is valid */
 330         mutex_lock(&ctxdata->mutex);
 331         sess = find_session(ctxdata, arg->session);
 332         mutex_unlock(&ctxdata->mutex);
 333         if (!sess)
 334                 return -EINVAL;
 335
 336         shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg);
 337         if (IS_ERR(shm))
 338                 return PTR_ERR(shm);
 339         msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
 340         msg_arg->func = arg->func;
 341         msg_arg->session = arg->session;
 342         msg_arg->cancel_id = arg->cancel_id;
 343
 344         rc = optee_to_msg_param(msg_arg->params, arg->num_params, param);
 345         if (rc)
 346                 goto out;
 347
 348         if (optee_do_call_with_arg(ctx, msg_parg)) {
 349                 msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 350                 msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 351         }
 352
 353         if (optee_from_msg_param(param, arg->num_params, msg_arg->params)) {
 354                 msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 355                 msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 356         }
 357
 358         arg->ret = msg_arg->ret;
 359         arg->ret_origin = msg_arg->ret_origin;
 360 out:
 361         tee_shm_free(shm);
 362         return rc;
 363 }
 364
 365 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
 366 {
 367         struct optee_context_data *ctxdata = ctx->data;
 368         struct tee_shm *shm;
 369         struct optee_msg_arg *msg_arg;
 370         phys_addr_t msg_parg;
 371         struct optee_session *sess;
 372
 373         /* Check that the session is valid */
 374         mutex_lock(&ctxdata->mutex);
 375         sess = find_session(ctxdata, session);
 376         mutex_unlock(&ctxdata->mutex);
 377         if (!sess)
 378                 return -EINVAL;
 379
 380         shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
 381         if (IS_ERR(shm))
 382                 return PTR_ERR(shm);
 383
 384         msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
 385         msg_arg->session = session;
 386         msg_arg->cancel_id = cancel_id;
 387         optee_do_call_with_arg(ctx, msg_parg);
 388
 389         tee_shm_free(shm);
 390         return 0;
 391 }
 392
 393 /**
 394  * optee_enable_shm_cache() - Enables caching of some shared memory allocation
 395  *                            in OP-TEE
 396  * @optee:      main service struct
 397  */
 398 void optee_enable_shm_cache(struct optee *optee)
 399 {
 400         struct optee_call_waiter w;
 401
 402         /* We need to retry until secure world isn't busy. */
 403         optee_cq_wait_init(&optee->call_queue, &w);
 404         while (true) {
 405                 struct arm_smccc_res res;
 406
 407                 optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
 408                                  0, &res);
 409                 if (res.a0 == OPTEE_SMC_RETURN_OK)
 410                         break;
 411                 optee_cq_wait_for_completion(&optee->call_queue, &w);
 412         }
 413         optee_cq_wait_final(&optee->call_queue, &w);
 414 }
 415
 416 /**
 417  * optee_disable_shm_cache() - Disables caching of some shared memory allocation
 418  *                            in OP-TEE
 419  * @optee:      main service struct
 420  */
 421 void optee_disable_shm_cache(struct optee *optee)
 422 {
 423         struct optee_call_waiter w;
 424
 425         /* We need to retry until secure world isn't busy. */
 426         optee_cq_wait_init(&optee->call_queue, &w);
 427         while (true) {
 428                 union {
 429                         struct arm_smccc_res smccc;
 430                         struct optee_smc_disable_shm_cache_result result;
 431                 } res;
 432
 433                 optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
 434                                  0, &res.smccc);
 435                 if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
 436                         break; /* All shm's freed */
 437                 if (res.result.status == OPTEE_SMC_RETURN_OK) {
 438                         struct tee_shm *shm;
 439
 440                         shm = reg_pair_to_ptr(res.result.shm_upper32,
 441                                               res.result.shm_lower32);
 442                         tee_shm_free(shm);
 443                 } else {
 444                         optee_cq_wait_for_completion(&optee->call_queue, &w);
 445                 }
 446         }
 447         optee_cq_wait_final(&optee->call_queue, &w);
 448 }
 449
 450 #define PAGELIST_ENTRIES_PER_PAGE                               \
 451         ((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
 452
 453 /**
 454  * optee_fill_pages_list() - write list of user pages to given shared
 455  * buffer.
 456  *
 457  * @dst: page-aligned buffer where list of pages will be stored
 458  * @pages: array of pages that represents shared buffer
 459  * @num_pages: number of entries in @pages
 460  * @page_offset: offset of user buffer from page start
 461  *
 462  * @dst should be big enough to hold list of user page addresses and
 463  *      links to the next pages of buffer
 464  */
 465 void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
 466                            size_t page_offset)
 467 {
 468         int n = 0;
 469         phys_addr_t optee_page;
 470         /*
 471          * Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
 472          * for details.
 473          */
 474         struct {
 475                 u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
 476                 u64 next_page_data;
 477         } *pages_data;
 478
 479         /*
 480          * Currently OP-TEE uses 4k page size and it does not looks
 481          * like this will change in the future.  On other hand, there are
 482          * no know ARM architectures with page size < 4k.
 483          * Thus the next built assert looks redundant. But the following
 484          * code heavily relies on this assumption, so it is better be
 485          * safe than sorry.
 486          */
 487         BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
 488
 489         pages_data = (void *)dst;
 490         /*
 491          * If linux page is bigger than 4k, and user buffer offset is
 492          * larger than 4k/8k/12k/etc this will skip first 4k pages,
 493          * because they bear no value data for OP-TEE.
 494          */
 495         optee_page = page_to_phys(*pages) +
 496                 round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
 497
 498         while (true) {
 499                 pages_data->pages_list[n++] = optee_page;
 500
 501                 if (n == PAGELIST_ENTRIES_PER_PAGE) {
 502                         pages_data->next_page_data =
 503                                 virt_to_phys(pages_data + 1);
 504                         pages_data++;
 505                         n = 0;
 506                 }
 507
 508                 optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
 509                 if (!(optee_page & ~PAGE_MASK)) {
 510                         if (!--num_pages)
 511                                 break;
 512                         pages++;
 513                         optee_page = page_to_phys(*pages);
 514                 }
 515         }
 516 }
 517
 518 /*
 519  * The final entry in each pagelist page is a pointer to the next
 520  * pagelist page.
 521  */
 522 static size_t get_pages_list_size(size_t num_entries)
 523 {
 524         int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
 525
 526         return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
 527 }
 528
 529 u64 *optee_allocate_pages_list(size_t num_entries)
 530 {
 531         return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
 532 }
 533
 534 void optee_free_pages_list(void *list, size_t num_entries)
 535 {
 536         free_pages_exact(list, get_pages_list_size(num_entries));
 537 }
 538
 539 static bool is_normal_memory(pgprot_t p)
 540 {
 541 #if defined(CONFIG_ARM)
 542         return (((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEALLOC) ||
 543                 ((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEBACK));
 544 #elif defined(CONFIG_ARM64)
 545         return (pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL);
 546 #else
 547 #error "Unuspported architecture"
 548 #endif
 549 }
 550
 551 static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
 552 {
 553         while (vma && is_normal_memory(vma->vm_page_prot)) {
 554                 if (vma->vm_end >= end)
 555                         return 0;
 556                 vma = vma->vm_next;
 557         }
 558
 559         return -EINVAL;
 560 }
 561
 562 static int check_mem_type(unsigned long start, size_t num_pages)
 563 {
 564         struct mm_struct *mm = current->mm;
 565         int rc;
 566
 567         /*
 568          * Allow kernel address to register with OP-TEE as kernel
 569          * pages are configured as normal memory only.
 570          */
 571         if (virt_addr_valid(start))
 572                 return 0;
 573
 574         mmap_read_lock(mm);
 575         rc = __check_mem_type(find_vma(mm, start),
 576                               start + num_pages * PAGE_SIZE);
 577         mmap_read_unlock(mm);
 578
 579         return rc;
 580 }
 581
 582 int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
 583                        struct page **pages, size_t num_pages,
 584                        unsigned long start)
 585 {
 586         struct tee_shm *shm_arg = NULL;
 587         struct optee_msg_arg *msg_arg;
 588         u64 *pages_list;
 589         phys_addr_t msg_parg;
 590         int rc;
 591
 592         if (!num_pages)
 593                 return -EINVAL;
 594
 595         rc = check_mem_type(start, num_pages);
 596         if (rc)
 597                 return rc;
 598
 599         pages_list = optee_allocate_pages_list(num_pages);
 600         if (!pages_list)
 601                 return -ENOMEM;
 602
 603         shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
 604         if (IS_ERR(shm_arg)) {
 605                 rc = PTR_ERR(shm_arg);
 606                 goto out;
 607         }
 608
 609         optee_fill_pages_list(pages_list, pages, num_pages,
 610                               tee_shm_get_page_offset(shm));
 611
 612         msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
 613         msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
 614                                 OPTEE_MSG_ATTR_NONCONTIG;
 615         msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
 616         msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
 617         /*
 618          * In the least bits of msg_arg->params->u.tmem.buf_ptr we
 619          * store buffer offset from 4k page, as described in OP-TEE ABI.
 620          */
 621         msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
 622           (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
 623
 624         if (optee_do_call_with_arg(ctx, msg_parg) ||
 625             msg_arg->ret != TEEC_SUCCESS)
 626                 rc = -EINVAL;
 627
 628         tee_shm_free(shm_arg);
 629 out:
 630         optee_free_pages_list(pages_list, num_pages);
 631         return rc;
 632 }
 633
 634 int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
 635 {
 636         struct tee_shm *shm_arg;
 637         struct optee_msg_arg *msg_arg;
 638         phys_addr_t msg_parg;
 639         int rc = 0;
 640
 641         shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
 642         if (IS_ERR(shm_arg))
 643                 return PTR_ERR(shm_arg);
 644
 645         msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
 646
 647         msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
 648         msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
 649
 650         if (optee_do_call_with_arg(ctx, msg_parg) ||
 651             msg_arg->ret != TEEC_SUCCESS)
 652                 rc = -EINVAL;
 653         tee_shm_free(shm_arg);
 654         return rc;
 655 }
 656
 657 int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
 658                             struct page **pages, size_t num_pages,
 659                             unsigned long start)
 660 {
 661         /*
 662          * We don't want to register supplicant memory in OP-TEE.
 663          * Instead information about it will be passed in RPC code.
 664          */
 665         return check_mem_type(start, num_pages);
 666 }
 667
 668 int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
 669 {
 670         return 0;
 671 }