drivers/tee/optee/core.c - linux/kernel/git/bpf/bpf - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2015, Linaro Limited
  */

 #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	CONFIG_OPTEE_SHM_NUM_PRIV_PAGES

 /**
  * 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 void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
 {
 	union {
 		struct arm_smccc_res smccc;
 		struct optee_smc_call_get_os_revision_result result;
 	} res = {
 		.result = {
 			.build_id = 0
 		}
 	};

 	invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
 		  &res.smccc);

 	if (res.result.build_id)
 		pr_info("revision %lu.%lu (%08lx)", res.result.major,
 			res.result.minor, res.result.build_id);
 	else
 		pr_info("revision %lu.%lu", res.result.major, res.result.minor);
 }

 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_dyn_shm(void)
 {
 	struct tee_shm_pool_mgr *priv_mgr;
 	struct tee_shm_pool_mgr *dmabuf_mgr;
 	void *rc;

 	rc = optee_shm_pool_alloc_pages();
 	if (IS_ERR(rc))
 		return rc;
 	priv_mgr = rc;

 	rc = optee_shm_pool_alloc_pages();
 	if (IS_ERR(rc)) {
 		tee_shm_pool_mgr_destroy(priv_mgr);
 		return rc;
 	}
 	dmabuf_mgr = rc;

 	rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
 	if (IS_ERR(rc)) {
 		tee_shm_pool_mgr_destroy(priv_mgr);
 		tee_shm_pool_mgr_destroy(dmabuf_mgr);
 	}

 	return rc;
 }

 static struct tee_shm_pool *
 optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
 {
 	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;
 	const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;

 	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_err("static 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;

 	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 *dev)
 {
 	const char *method;

 	pr_info("probing for conduit method.\n");

 	if (device_property_read_string(dev, "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 int optee_remove(struct platform_device *pdev)
 {
 	struct optee *optee = platform_get_drvdata(pdev);

 	/*
 	 * 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 have 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);

 	return 0;
 }

 static int optee_probe(struct platform_device *pdev)
 {
 	optee_invoke_fn *invoke_fn;
 	struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
 	struct optee *optee = NULL;
 	void *memremaped_shm = NULL;
 	struct tee_device *teedev;
 	u32 sec_caps;
 	int rc;

 	invoke_fn = get_invoke_func(&pdev->dev);
 	if (IS_ERR(invoke_fn))
 		return PTR_ERR(invoke_fn);

 	if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
 		pr_warn("api uid mismatch\n");
 		return -EINVAL;
 	}

 	optee_msg_get_os_revision(invoke_fn);

 	if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
 		pr_warn("api revision mismatch\n");
 		return -EINVAL;
 	}

 	if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
 		pr_warn("capabilities mismatch\n");
 		return -EINVAL;
 	}

 	/*
 	 * Try to use dynamic shared memory if possible
 	 */
 	if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 		pool = optee_config_dyn_shm();

 	/*
 	 * If dynamic shared memory is not available or failed - try static one
 	 */
 	if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
 		pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);

 	if (IS_ERR(pool))
 		return PTR_ERR(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);

 	if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
 		pr_info("dynamic shared memory is enabled\n");

 	platform_set_drvdata(pdev, optee);

 	rc = optee_enumerate_devices();
 	if (rc) {
 		optee_remove(pdev);
 		return rc;
 	}

 	pr_info("initialized driver\n");
 	return 0;
 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 rc;
 }

 static const struct of_device_id optee_dt_match[] = {
 	{ .compatible = "linaro,optee-tz" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, optee_dt_match);

 static struct platform_driver optee_driver = {
 	.probe  = optee_probe,
 	.remove = optee_remove,
 	.driver = {
 		.name = "optee",
 		.of_match_table = optee_dt_match,
 	},
 };
 module_platform_driver(optee_driver);

 MODULE_AUTHOR("Linaro");
 MODULE_DESCRIPTION("OP-TEE driver");
 MODULE_SUPPORTED_DEVICE("");
 MODULE_VERSION("1.0");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:optee");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2015, Linaro Limited
	*/

	#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 CONFIG_OPTEE_SHM_NUM_PRIV_PAGES

	/**
	* 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 void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
	{
	union {
	struct arm_smccc_res smccc;
	struct optee_smc_call_get_os_revision_result result;
	} res = {
	.result = {
	.build_id = 0
	}
	};

	invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
	&res.smccc);

	if (res.result.build_id)
	pr_info("revision %lu.%lu (%08lx)", res.result.major,
	res.result.minor, res.result.build_id);
	else
	pr_info("revision %lu.%lu", res.result.major, res.result.minor);
	}

	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_dyn_shm(void)
	{
	struct tee_shm_pool_mgr *priv_mgr;
	struct tee_shm_pool_mgr *dmabuf_mgr;
	void *rc;

	rc = optee_shm_pool_alloc_pages();
	if (IS_ERR(rc))
	return rc;
	priv_mgr = rc;

	rc = optee_shm_pool_alloc_pages();
	if (IS_ERR(rc)) {
	tee_shm_pool_mgr_destroy(priv_mgr);
	return rc;
	}
	dmabuf_mgr = rc;

	rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
	if (IS_ERR(rc)) {
	tee_shm_pool_mgr_destroy(priv_mgr);
	tee_shm_pool_mgr_destroy(dmabuf_mgr);
	}

	return rc;
	}

	static struct tee_shm_pool *
	optee_config_shm_memremap(optee_invoke_fn invoke_fn, void *memremaped_shm)
	{
	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;
	const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;

	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_err("static 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;

	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 dev)
	{
	const char *method;

	pr_info("probing for conduit method.\n");

	if (device_property_read_string(dev, "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 int optee_remove(struct platform_device *pdev)
	{
	struct optee *optee = platform_get_drvdata(pdev);

	/*
	* 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 have 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);

	return 0;
	}

	static int optee_probe(struct platform_device *pdev)
	{
	optee_invoke_fn *invoke_fn;
	struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
	struct optee *optee = NULL;
	void *memremaped_shm = NULL;
	struct tee_device *teedev;
	u32 sec_caps;
	int rc;

	invoke_fn = get_invoke_func(&pdev->dev);
	if (IS_ERR(invoke_fn))
	return PTR_ERR(invoke_fn);

	if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
	pr_warn("api uid mismatch\n");
	return -EINVAL;
	}

	optee_msg_get_os_revision(invoke_fn);

	if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
	pr_warn("api revision mismatch\n");
	return -EINVAL;
	}

	if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
	pr_warn("capabilities mismatch\n");
	return -EINVAL;
	}

	/*
	* Try to use dynamic shared memory if possible
	*/
	if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
	pool = optee_config_dyn_shm();

	/*
	* If dynamic shared memory is not available or failed - try static one
	*/
	if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
	pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);

	if (IS_ERR(pool))
	return PTR_ERR(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);

	if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
	pr_info("dynamic shared memory is enabled\n");

	platform_set_drvdata(pdev, optee);

	rc = optee_enumerate_devices();
	if (rc) {
	optee_remove(pdev);
	return rc;
	}

	pr_info("initialized driver\n");
	return 0;
	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 rc;
	}

	static const struct of_device_id optee_dt_match[] = {
	{ .compatible = "linaro,optee-tz" },
	{},
	};
	MODULE_DEVICE_TABLE(of, optee_dt_match);

	static struct platform_driver optee_driver = {
	.probe = optee_probe,
	.remove = optee_remove,
	.driver = {
	.name = "optee",
	.of_match_table = optee_dt_match,
	},
	};
	module_platform_driver(optee_driver);

	MODULE_AUTHOR("Linaro");
	MODULE_DESCRIPTION("OP-TEE driver");
	MODULE_SUPPORTED_DEVICE("");
	MODULE_VERSION("1.0");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:optee");