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- /*
- * Copyright (c) 2015, Linaro Limited
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #include <linux/arm-smccc.h>
- #include <linux/errno.h>
- #include <linux/io.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/tee_drv.h>
- #include <linux/types.h>
- #include <linux/uaccess.h>
- #include "optee_private.h"
- #include "optee_smc.h"
- #include "shm_pool.h"
- #define DRIVER_NAME "optee"
- #define OPTEE_SHM_NUM_PRIV_PAGES 1
- /**
- * optee_from_msg_param() - convert from OPTEE_MSG parameters to
- * struct tee_param
- * @params: subsystem internal parameter representation
- * @num_params: number of elements in the parameter arrays
- * @msg_params: OPTEE_MSG parameters
- * Returns 0 on success or <0 on failure
- */
- int optee_from_msg_param(struct tee_param *params, size_t num_params,
- const struct optee_msg_param *msg_params)
- {
- int rc;
- size_t n;
- struct tee_shm *shm;
- phys_addr_t pa;
- for (n = 0; n < num_params; n++) {
- struct tee_param *p = params + n;
- const struct optee_msg_param *mp = msg_params + n;
- u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
- switch (attr) {
- case OPTEE_MSG_ATTR_TYPE_NONE:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
- memset(&p->u, 0, sizeof(p->u));
- break;
- case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
- case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
- p->u.value.a = mp->u.value.a;
- p->u.value.b = mp->u.value.b;
- p->u.value.c = mp->u.value.c;
- break;
- case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
- case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
- p->u.memref.size = mp->u.tmem.size;
- shm = (struct tee_shm *)(unsigned long)
- mp->u.tmem.shm_ref;
- if (!shm) {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- break;
- }
- rc = tee_shm_get_pa(shm, 0, &pa);
- if (rc)
- return rc;
- p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
- p->u.memref.shm = shm;
- /* Check that the memref is covered by the shm object */
- if (p->u.memref.size) {
- size_t o = p->u.memref.shm_offs +
- p->u.memref.size - 1;
- rc = tee_shm_get_pa(shm, o, NULL);
- if (rc)
- return rc;
- }
- break;
- case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
- case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
- case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
- p->u.memref.size = mp->u.rmem.size;
- shm = (struct tee_shm *)(unsigned long)
- mp->u.rmem.shm_ref;
- if (!shm) {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- break;
- }
- p->u.memref.shm_offs = mp->u.rmem.offs;
- p->u.memref.shm = shm;
- break;
- default:
- return -EINVAL;
- }
- }
- return 0;
- }
- static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
- const struct tee_param *p)
- {
- int rc;
- phys_addr_t pa;
- mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
- mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
- mp->u.tmem.size = p->u.memref.size;
- if (!p->u.memref.shm) {
- mp->u.tmem.buf_ptr = 0;
- return 0;
- }
- rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
- if (rc)
- return rc;
- mp->u.tmem.buf_ptr = pa;
- mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
- OPTEE_MSG_ATTR_CACHE_SHIFT;
- return 0;
- }
- static int to_msg_param_reg_mem(struct optee_msg_param *mp,
- const struct tee_param *p)
- {
- mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
- mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
- mp->u.rmem.size = p->u.memref.size;
- mp->u.rmem.offs = p->u.memref.shm_offs;
- return 0;
- }
- /**
- * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
- * @msg_params: OPTEE_MSG parameters
- * @num_params: number of elements in the parameter arrays
- * @params: subsystem itnernal parameter representation
- * Returns 0 on success or <0 on failure
- */
- int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
- const struct tee_param *params)
- {
- int rc;
- size_t n;
- for (n = 0; n < num_params; n++) {
- const struct tee_param *p = params + n;
- struct optee_msg_param *mp = msg_params + n;
- switch (p->attr) {
- case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
- mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
- memset(&mp->u, 0, sizeof(mp->u));
- break;
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
- mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
- mp->u.value.a = p->u.value.a;
- mp->u.value.b = p->u.value.b;
- mp->u.value.c = p->u.value.c;
- break;
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
- case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
- if (tee_shm_is_registered(p->u.memref.shm))
- rc = to_msg_param_reg_mem(mp, p);
- else
- rc = to_msg_param_tmp_mem(mp, p);
- if (rc)
- return rc;
- break;
- default:
- return -EINVAL;
- }
- }
- return 0;
- }
- static void optee_get_version(struct tee_device *teedev,
- struct tee_ioctl_version_data *vers)
- {
- struct tee_ioctl_version_data v = {
- .impl_id = TEE_IMPL_ID_OPTEE,
- .impl_caps = TEE_OPTEE_CAP_TZ,
- .gen_caps = TEE_GEN_CAP_GP,
- };
- struct optee *optee = tee_get_drvdata(teedev);
- if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
- v.gen_caps |= TEE_GEN_CAP_REG_MEM;
- *vers = v;
- }
- static int optee_open(struct tee_context *ctx)
- {
- struct optee_context_data *ctxdata;
- struct tee_device *teedev = ctx->teedev;
- struct optee *optee = tee_get_drvdata(teedev);
- ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
- if (!ctxdata)
- return -ENOMEM;
- if (teedev == optee->supp_teedev) {
- bool busy = true;
- mutex_lock(&optee->supp.mutex);
- if (!optee->supp.ctx) {
- busy = false;
- optee->supp.ctx = ctx;
- }
- mutex_unlock(&optee->supp.mutex);
- if (busy) {
- kfree(ctxdata);
- return -EBUSY;
- }
- }
- mutex_init(&ctxdata->mutex);
- INIT_LIST_HEAD(&ctxdata->sess_list);
- ctx->data = ctxdata;
- return 0;
- }
- static void optee_release(struct tee_context *ctx)
- {
- struct optee_context_data *ctxdata = ctx->data;
- struct tee_device *teedev = ctx->teedev;
- struct optee *optee = tee_get_drvdata(teedev);
- struct tee_shm *shm;
- struct optee_msg_arg *arg = NULL;
- phys_addr_t parg;
- struct optee_session *sess;
- struct optee_session *sess_tmp;
- if (!ctxdata)
- return;
- shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
- if (!IS_ERR(shm)) {
- arg = tee_shm_get_va(shm, 0);
- /*
- * If va2pa fails for some reason, we can't call into
- * secure world, only free the memory. Secure OS will leak
- * sessions and finally refuse more sessions, but we will
- * at least let normal world reclaim its memory.
- */
- if (!IS_ERR(arg))
- if (tee_shm_va2pa(shm, arg, &parg))
- arg = NULL; /* prevent usage of parg below */
- }
- list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
- list_node) {
- list_del(&sess->list_node);
- if (!IS_ERR_OR_NULL(arg)) {
- memset(arg, 0, sizeof(*arg));
- arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
- arg->session = sess->session_id;
- optee_do_call_with_arg(ctx, parg);
- }
- kfree(sess);
- }
- kfree(ctxdata);
- if (!IS_ERR(shm))
- tee_shm_free(shm);
- ctx->data = NULL;
- if (teedev == optee->supp_teedev)
- optee_supp_release(&optee->supp);
- }
- static const struct tee_driver_ops optee_ops = {
- .get_version = optee_get_version,
- .open = optee_open,
- .release = optee_release,
- .open_session = optee_open_session,
- .close_session = optee_close_session,
- .invoke_func = optee_invoke_func,
- .cancel_req = optee_cancel_req,
- .shm_register = optee_shm_register,
- .shm_unregister = optee_shm_unregister,
- };
- static const struct tee_desc optee_desc = {
- .name = DRIVER_NAME "-clnt",
- .ops = &optee_ops,
- .owner = THIS_MODULE,
- };
- static const struct tee_driver_ops optee_supp_ops = {
- .get_version = optee_get_version,
- .open = optee_open,
- .release = optee_release,
- .supp_recv = optee_supp_recv,
- .supp_send = optee_supp_send,
- .shm_register = optee_shm_register_supp,
- .shm_unregister = optee_shm_unregister_supp,
- };
- static const struct tee_desc optee_supp_desc = {
- .name = DRIVER_NAME "-supp",
- .ops = &optee_supp_ops,
- .owner = THIS_MODULE,
- .flags = TEE_DESC_PRIVILEGED,
- };
- static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
- {
- struct arm_smccc_res res;
- invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
- if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
- res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
- return true;
- return false;
- }
- static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
- {
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_calls_revision_result result;
- } res;
- invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
- if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
- (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
- return true;
- return false;
- }
- static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
- u32 *sec_caps)
- {
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_exchange_capabilities_result result;
- } res;
- u32 a1 = 0;
- /*
- * TODO This isn't enough to tell if it's UP system (from kernel
- * point of view) or not, is_smp() returns the the information
- * needed, but can't be called directly from here.
- */
- if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
- a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
- invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
- &res.smccc);
- if (res.result.status != OPTEE_SMC_RETURN_OK)
- return false;
- *sec_caps = res.result.capabilities;
- return true;
- }
- static struct tee_shm_pool *
- optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm,
- u32 sec_caps)
- {
- union {
- struct arm_smccc_res smccc;
- struct optee_smc_get_shm_config_result result;
- } res;
- unsigned long vaddr;
- phys_addr_t paddr;
- size_t size;
- phys_addr_t begin;
- phys_addr_t end;
- void *va;
- struct tee_shm_pool_mgr *priv_mgr;
- struct tee_shm_pool_mgr *dmabuf_mgr;
- void *rc;
- invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
- if (res.result.status != OPTEE_SMC_RETURN_OK) {
- pr_info("shm service not available\n");
- return ERR_PTR(-ENOENT);
- }
- if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
- pr_err("only normal cached shared memory supported\n");
- return ERR_PTR(-EINVAL);
- }
- begin = roundup(res.result.start, PAGE_SIZE);
- end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
- paddr = begin;
- size = end - begin;
- if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
- pr_err("too small shared memory area\n");
- return ERR_PTR(-EINVAL);
- }
- va = memremap(paddr, size, MEMREMAP_WB);
- if (!va) {
- pr_err("shared memory ioremap failed\n");
- return ERR_PTR(-EINVAL);
- }
- vaddr = (unsigned long)va;
- /*
- * If OP-TEE can work with unregistered SHM, we will use own pool
- * for private shm
- */
- if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM) {
- rc = optee_shm_pool_alloc_pages();
- if (IS_ERR(rc))
- goto err_memunmap;
- priv_mgr = rc;
- } else {
- const size_t sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
- rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
- 3 /* 8 bytes aligned */);
- if (IS_ERR(rc))
- goto err_memunmap;
- priv_mgr = rc;
- vaddr += sz;
- paddr += sz;
- size -= sz;
- }
- rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
- if (IS_ERR(rc))
- goto err_free_priv_mgr;
- dmabuf_mgr = rc;
- rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
- if (IS_ERR(rc))
- goto err_free_dmabuf_mgr;
- *memremaped_shm = va;
- return rc;
- err_free_dmabuf_mgr:
- tee_shm_pool_mgr_destroy(dmabuf_mgr);
- err_free_priv_mgr:
- tee_shm_pool_mgr_destroy(priv_mgr);
- err_memunmap:
- memunmap(va);
- return rc;
- }
- /* Simple wrapper functions to be able to use a function pointer */
- static void optee_smccc_smc(unsigned long a0, unsigned long a1,
- unsigned long a2, unsigned long a3,
- unsigned long a4, unsigned long a5,
- unsigned long a6, unsigned long a7,
- struct arm_smccc_res *res)
- {
- arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
- }
- static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
- unsigned long a2, unsigned long a3,
- unsigned long a4, unsigned long a5,
- unsigned long a6, unsigned long a7,
- struct arm_smccc_res *res)
- {
- arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
- }
- static optee_invoke_fn *get_invoke_func(struct device_node *np)
- {
- const char *method;
- pr_info("probing for conduit method from DT.\n");
- if (of_property_read_string(np, "method", &method)) {
- pr_warn("missing \"method\" property\n");
- return ERR_PTR(-ENXIO);
- }
- if (!strcmp("hvc", method))
- return optee_smccc_hvc;
- else if (!strcmp("smc", method))
- return optee_smccc_smc;
- pr_warn("invalid \"method\" property: %s\n", method);
- return ERR_PTR(-EINVAL);
- }
- static struct optee *optee_probe(struct device_node *np)
- {
- optee_invoke_fn *invoke_fn;
- struct tee_shm_pool *pool;
- struct optee *optee = NULL;
- void *memremaped_shm = NULL;
- struct tee_device *teedev;
- u32 sec_caps;
- int rc;
- invoke_fn = get_invoke_func(np);
- if (IS_ERR(invoke_fn))
- return (void *)invoke_fn;
- if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
- pr_warn("api uid mismatch\n");
- return ERR_PTR(-EINVAL);
- }
- if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
- pr_warn("api revision mismatch\n");
- return ERR_PTR(-EINVAL);
- }
- if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
- pr_warn("capabilities mismatch\n");
- return ERR_PTR(-EINVAL);
- }
- /*
- * We have no other option for shared memory, if secure world
- * doesn't have any reserved memory we can use we can't continue.
- */
- if (!(sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
- return ERR_PTR(-EINVAL);
- pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm, sec_caps);
- if (IS_ERR(pool))
- return (void *)pool;
- optee = kzalloc(sizeof(*optee), GFP_KERNEL);
- if (!optee) {
- rc = -ENOMEM;
- goto err;
- }
- optee->invoke_fn = invoke_fn;
- optee->sec_caps = sec_caps;
- teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
- if (IS_ERR(teedev)) {
- rc = PTR_ERR(teedev);
- goto err;
- }
- optee->teedev = teedev;
- teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
- if (IS_ERR(teedev)) {
- rc = PTR_ERR(teedev);
- goto err;
- }
- optee->supp_teedev = teedev;
- rc = tee_device_register(optee->teedev);
- if (rc)
- goto err;
- rc = tee_device_register(optee->supp_teedev);
- if (rc)
- goto err;
- mutex_init(&optee->call_queue.mutex);
- INIT_LIST_HEAD(&optee->call_queue.waiters);
- optee_wait_queue_init(&optee->wait_queue);
- optee_supp_init(&optee->supp);
- optee->memremaped_shm = memremaped_shm;
- optee->pool = pool;
- optee_enable_shm_cache(optee);
- pr_info("initialized driver\n");
- return optee;
- err:
- if (optee) {
- /*
- * tee_device_unregister() is safe to call even if the
- * devices hasn't been registered with
- * tee_device_register() yet.
- */
- tee_device_unregister(optee->supp_teedev);
- tee_device_unregister(optee->teedev);
- kfree(optee);
- }
- if (pool)
- tee_shm_pool_free(pool);
- if (memremaped_shm)
- memunmap(memremaped_shm);
- return ERR_PTR(rc);
- }
- static void optee_remove(struct optee *optee)
- {
- /*
- * Ask OP-TEE to free all cached shared memory objects to decrease
- * reference counters and also avoid wild pointers in secure world
- * into the old shared memory range.
- */
- optee_disable_shm_cache(optee);
- /*
- * The two devices has to be unregistered before we can free the
- * other resources.
- */
- tee_device_unregister(optee->supp_teedev);
- tee_device_unregister(optee->teedev);
- tee_shm_pool_free(optee->pool);
- if (optee->memremaped_shm)
- memunmap(optee->memremaped_shm);
- optee_wait_queue_exit(&optee->wait_queue);
- optee_supp_uninit(&optee->supp);
- mutex_destroy(&optee->call_queue.mutex);
- kfree(optee);
- }
- static const struct of_device_id optee_match[] = {
- { .compatible = "linaro,optee-tz" },
- {},
- };
- static struct optee *optee_svc;
- static int __init optee_driver_init(void)
- {
- struct device_node *fw_np;
- struct device_node *np;
- struct optee *optee;
- /* Node is supposed to be below /firmware */
- fw_np = of_find_node_by_name(NULL, "firmware");
- if (!fw_np)
- return -ENODEV;
- np = of_find_matching_node(fw_np, optee_match);
- if (!np)
- return -ENODEV;
- optee = optee_probe(np);
- of_node_put(np);
- if (IS_ERR(optee))
- return PTR_ERR(optee);
- optee_svc = optee;
- return 0;
- }
- module_init(optee_driver_init);
- static void __exit optee_driver_exit(void)
- {
- struct optee *optee = optee_svc;
- optee_svc = NULL;
- if (optee)
- optee_remove(optee);
- }
- module_exit(optee_driver_exit);
- MODULE_AUTHOR("Linaro");
- MODULE_DESCRIPTION("OP-TEE driver");
- MODULE_SUPPORTED_DEVICE("");
- MODULE_VERSION("1.0");
- MODULE_LICENSE("GPL v2");
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