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