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From:   Jens Wiklander <jens.wiklander@linaro.org>
To:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        op-tee@lists.trustedfirmware.org
Cc:     Sumit Garg <sumit.garg@linaro.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Marc Bonnici <marc.bonnici@arm.com>,
        Jerome Forissier <jerome@forissier.org>,
        sughosh.ganu@linaro.org, Jens Wiklander <jens.wiklander@linaro.org>
Subject: [PATCH v4 5/5] optee: add FF-A support
Date:   Thu, 19 Aug 2021 13:06:55 +0200
Message-Id: <20210819110655.739318-6-jens.wiklander@linaro.org>
In-Reply-To: <20210819110655.739318-1-jens.wiklander@linaro.org>
References: <20210819110655.739318-1-jens.wiklander@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Adds support for using FF-A [1] as transport to the OP-TEE driver.

Introduces struct optee_msg_param_fmem which carries all information
needed when OP-TEE is calling FFA_MEM_RETRIEVE_REQ to get the shared
memory reference mapped by the hypervisor in S-EL2. Register usage is
also updated to include the information needed.

The FF-A part of this driver is enabled if CONFIG_ARM_FFA_TRANSPORT is
enabled.

[1] https://developer.arm.com/documentation/den0077/latest
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
---
 drivers/tee/optee/Makefile        |   3 +-
 drivers/tee/optee/call.c          |  13 +-
 drivers/tee/optee/core.c          |  16 +-
 drivers/tee/optee/ffa_abi.c       | 907 ++++++++++++++++++++++++++++++
 drivers/tee/optee/optee_ffa.h     | 153 +++++
 drivers/tee/optee/optee_msg.h     |  27 +-
 drivers/tee/optee/optee_private.h |  43 +-
 7 files changed, 1148 insertions(+), 14 deletions(-)
 create mode 100644 drivers/tee/optee/ffa_abi.c
 create mode 100644 drivers/tee/optee/optee_ffa.h

diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
index e92f77462f40..dbfd83d3c4ae 100644
--- a/drivers/tee/optee/Makefile
+++ b/drivers/tee/optee/Makefile
@@ -7,7 +7,8 @@ optee-objs += supp.o
 optee-objs += device.o
 
 optee-smc-abi-y = smc_abi.o
-optee-objs += $(optee-ffa-abi-y)
+optee-ffa-abi-$(CONFIG_ARM_FFA_TRANSPORT) = ffa_abi.o
+optee-objs += $(optee-smc-abi-y) $(optee-ffa-abi-y)
 
 # for tracing framework to find optee_trace.h
 CFLAGS_smc_abi.o := -I$(src)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index 3f81c168ed3f..87d739091055 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -107,11 +107,20 @@ static struct optee_session *find_session(struct optee_context_data *ctxdata,
 struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
 				  struct optee_msg_arg **msg_arg)
 {
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	size_t sz = OPTEE_MSG_GET_ARG_SIZE(num_params);
 	struct tee_shm *shm;
 	struct optee_msg_arg *ma;
 
-	shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params),
-			    TEE_SHM_MAPPED);
+	/*
+	 * rpc_arg_count is set to the number of allocated parameters in
+	 * the RPC argument struct if a second MSG arg struct is expected.
+	 * The second arg struct will then be used for RPC.
+	 */
+	if (optee->rpc_arg_count)
+		sz += OPTEE_MSG_GET_ARG_SIZE(optee->rpc_arg_count);
+
+	shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
 	if (IS_ERR(shm))
 		return shm;
 
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index e372ebaff5d6..c22cdf65451b 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -160,15 +160,27 @@ void optee_remove_common(struct optee *optee)
 	mutex_destroy(&optee->call_queue.mutex);
 }
 
+static int smc_abi_rc;
+static int ffa_abi_rc;
+
 static int optee_core_init(void)
 {
-	return optee_smc_abi_register();
+	smc_abi_rc = optee_smc_abi_register();
+	ffa_abi_rc = optee_ffa_abi_register();
+
+	/* If both failed there's no point with this module */
+	if (smc_abi_rc && ffa_abi_rc)
+		return smc_abi_rc;
+	return 0;
 }
 module_init(optee_core_init);
 
 static void optee_core_exit(void)
 {
-	optee_smc_abi_unregister();
+	if (!smc_abi_rc)
+		optee_smc_abi_unregister();
+	if (!ffa_abi_rc)
+		optee_ffa_abi_unregister();
 }
 module_exit(optee_core_exit);
 
diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
new file mode 100644
index 000000000000..85dca49ac2ce
--- /dev/null
+++ b/drivers/tee/optee/ffa_abi.c
@@ -0,0 +1,907 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, Linaro Limited
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/arm_ffa.h>
+#include <linux/errno.h>
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tee_drv.h>
+#include <linux/types.h>
+#include "optee_private.h"
+#include "optee_ffa.h"
+#include "optee_rpc_cmd.h"
+
+/*
+ * This file implement the FF-A ABI used when communicating with secure world
+ * OP-TEE OS via FF-A.
+ * This file is divided into the follow sections:
+ * 1. Maintain a hash table for lookup of a global FF-A memory handle
+ * 2. Convert between struct tee_param and struct optee_msg_param
+ * 3. Low level support functions to register shared memory in secure world
+ * 4. Dynamic shared memory pool based on alloc_pages()
+ * 5. Do a normal scheduled call into secure world
+ * 6. Driver initialization.
+ */
+
+/*
+ * 1. Maintain a hash table for lookup of a global FF-A memory handle
+ *
+ * FF-A assigns a global memory handle for each piece shared memory.
+ * This handle is then used when communicating with secure world.
+ *
+ * Main functions are optee_shm_add_ffa_handle() and optee_shm_rem_ffa_handle()
+ */
+struct shm_rhash {
+	struct tee_shm *shm;
+	u64 global_id;
+	struct rhash_head linkage;
+};
+
+static void rh_free_fn(void *ptr, void *arg)
+{
+	kfree(ptr);
+}
+
+static const struct rhashtable_params shm_rhash_params = {
+	.head_offset = offsetof(struct shm_rhash, linkage),
+	.key_len     = sizeof(u64),
+	.key_offset  = offsetof(struct shm_rhash, global_id),
+	.automatic_shrinking = true,
+};
+
+static struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee,
+						 u64 global_id)
+{
+	struct tee_shm *shm = NULL;
+	struct shm_rhash *r;
+
+	mutex_lock(&optee->ffa.mutex);
+	r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
+				   shm_rhash_params);
+	if (r)
+		shm = r->shm;
+	mutex_unlock(&optee->ffa.mutex);
+
+	return shm;
+}
+
+static int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm,
+				    u64 global_id)
+{
+	struct shm_rhash *r;
+	int rc;
+
+	r = kmalloc(sizeof(*r), GFP_KERNEL);
+	if (!r)
+		return -ENOMEM;
+	r->shm = shm;
+	r->global_id = global_id;
+
+	mutex_lock(&optee->ffa.mutex);
+	rc = rhashtable_lookup_insert_fast(&optee->ffa.global_ids, &r->linkage,
+					   shm_rhash_params);
+	mutex_unlock(&optee->ffa.mutex);
+
+	if (rc)
+		kfree(r);
+
+	return rc;
+}
+
+static int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id)
+{
+	struct shm_rhash *r;
+	int rc = -ENOENT;
+
+	mutex_lock(&optee->ffa.mutex);
+	r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
+				   shm_rhash_params);
+	if (r)
+		rc = rhashtable_remove_fast(&optee->ffa.global_ids,
+					    &r->linkage, shm_rhash_params);
+	mutex_unlock(&optee->ffa.mutex);
+
+	if (!rc)
+		kfree(r);
+
+	return rc;
+}
+
+/*
+ * 2. Convert between struct tee_param and struct optee_msg_param
+ *
+ * optee_ffa_from_msg_param() and optee_ffa_to_msg_param() are the main
+ * functions.
+ */
+
+static void from_msg_param_ffa_mem(struct optee *optee, struct tee_param *p,
+				   u32 attr, const struct optee_msg_param *mp)
+{
+	struct tee_shm *shm = NULL;
+	u64 offs_high = 0;
+	u64 offs_low = 0;
+
+	p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+		  attr - OPTEE_MSG_ATTR_TYPE_FMEM_INPUT;
+	p->u.memref.size = mp->u.fmem.size;
+
+	if (mp->u.fmem.global_id != OPTEE_MSG_FMEM_INVALID_GLOBAL_ID)
+		shm = optee_shm_from_ffa_handle(optee, mp->u.fmem.global_id);
+	p->u.memref.shm = shm;
+
+	if (shm) {
+		offs_low = mp->u.fmem.offs_low;
+		offs_high = mp->u.fmem.offs_high;
+	}
+	p->u.memref.shm_offs = offs_low | offs_high << 32;
+}
+
+/**
+ * optee_ffa_from_msg_param() - convert from OPTEE_MSG parameters to
+ *				struct tee_param
+ * @optee:	main service struct
+ * @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
+ */
+static int optee_ffa_from_msg_param(struct optee *optee,
+				    struct tee_param *params, size_t num_params,
+				    const struct optee_msg_param *msg_params)
+{
+	size_t n;
+
+	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:
+			optee_from_msg_param_value(p, attr, mp);
+			break;
+		case OPTEE_MSG_ATTR_TYPE_FMEM_INPUT:
+		case OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT:
+		case OPTEE_MSG_ATTR_TYPE_FMEM_INOUT:
+			from_msg_param_ffa_mem(optee, p, attr, mp);
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int to_msg_param_ffa_mem(struct optee_msg_param *mp,
+				const struct tee_param *p)
+{
+	struct tee_shm *shm = p->u.memref.shm;
+
+	mp->attr = OPTEE_MSG_ATTR_TYPE_FMEM_INPUT + p->attr -
+		   TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
+
+	if (shm) {
+		u64 shm_offs = p->u.memref.shm_offs;
+
+		mp->u.fmem.internal_offs = shm->offset;
+
+		mp->u.fmem.offs_low = shm_offs;
+		mp->u.fmem.offs_high = shm_offs >> 32;
+		/* Check that the entire offset could be stored. */
+		if (mp->u.fmem.offs_high != shm_offs >> 32)
+			return -EINVAL;
+
+		mp->u.fmem.global_id = shm->sec_world_id;
+	} else {
+		memset(&mp->u, 0, sizeof(mp->u));
+		mp->u.fmem.global_id = OPTEE_MSG_FMEM_INVALID_GLOBAL_ID;
+	}
+	mp->u.fmem.size = p->u.memref.size;
+
+	return 0;
+}
+
+/**
+ * optee_ffa_to_msg_param() - convert from struct tee_params to OPTEE_MSG
+ *			      parameters
+ * @optee:	main service struct
+ * @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
+ */
+static int optee_ffa_to_msg_param(struct optee *optee,
+				  struct optee_msg_param *msg_params,
+				  size_t num_params,
+				  const struct tee_param *params)
+{
+	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:
+			optee_to_msg_param_value(mp, p);
+			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 (to_msg_param_ffa_mem(mp, p))
+				return -EINVAL;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * 3. Low level support functions to register shared memory in secure world
+ *
+ * Functions to register and unregister shared memory both for normal
+ * clients and for tee-supplicant.
+ */
+
+static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+				  struct page **pages, size_t num_pages,
+				  unsigned long start)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+	struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+	struct ffa_mem_region_attributes mem_attr = {
+		.receiver = ffa_dev->vm_id,
+		.attrs = FFA_MEM_RW,
+	};
+	struct ffa_mem_ops_args args = {
+		.use_txbuf = true,
+		.attrs = &mem_attr,
+		.nattrs = 1,
+	};
+	struct sg_table sgt;
+	int rc;
+
+	rc = optee_check_mem_type(start, num_pages);
+	if (rc)
+		return rc;
+
+	rc = sg_alloc_table_from_pages(&sgt, pages, num_pages, 0,
+				       num_pages * PAGE_SIZE, GFP_KERNEL);
+	if (rc)
+		return rc;
+	args.sg = sgt.sgl;
+	rc = ffa_ops->memory_share(ffa_dev, &args);
+	sg_free_table(&sgt);
+	if (rc)
+		return rc;
+
+	rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
+	if (rc) {
+		ffa_ops->memory_reclaim(args.g_handle, 0);
+		return rc;
+	}
+
+	shm->sec_world_id = args.g_handle;
+
+	return 0;
+}
+
+static int optee_ffa_shm_unregister(struct tee_context *ctx,
+				    struct tee_shm *shm)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+	struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+	u64 global_handle = shm->sec_world_id;
+	struct ffa_send_direct_data data = {
+		.data0 = OPTEE_FFA_UNREGISTER_SHM,
+		.data1 = (u32)global_handle,
+		.data2 = (u32)(global_handle >> 32)
+	};
+	int rc;
+
+	optee_shm_rem_ffa_handle(optee, global_handle);
+	shm->sec_world_id = 0;
+
+	rc = ffa_ops->sync_send_receive(ffa_dev, &data);
+	if (rc)
+		pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
+
+	rc = ffa_ops->memory_reclaim(global_handle, 0);
+	if (rc)
+		pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
+
+	return rc;
+}
+
+static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
+					 struct tee_shm *shm)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+	u64 global_handle = shm->sec_world_id;
+	int rc;
+
+	/*
+	 * We're skipping the OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM call
+	 * since this is OP-TEE freeing via RPC so it has already retired
+	 * this ID.
+	 */
+
+	optee_shm_rem_ffa_handle(optee, global_handle);
+	rc = ffa_ops->memory_reclaim(global_handle, 0);
+	if (rc)
+		pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
+
+	shm->sec_world_id = 0;
+
+	return rc;
+}
+
+/*
+ * 4. Dynamic shared memory pool based on alloc_pages()
+ *
+ * Implements an OP-TEE specific shared memory pool.
+ * The main function is optee_ffa_shm_pool_alloc_pages().
+ */
+
+static int pool_ffa_op_alloc(struct tee_shm_pool_mgr *poolm,
+			     struct tee_shm *shm, size_t size)
+{
+	return optee_pool_op_alloc_helper(poolm, shm, size,
+					  optee_ffa_shm_register);
+}
+
+static void pool_ffa_op_free(struct tee_shm_pool_mgr *poolm,
+			     struct tee_shm *shm)
+{
+	optee_ffa_shm_unregister(shm->ctx, shm);
+	free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+	shm->kaddr = NULL;
+}
+
+static void pool_ffa_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
+{
+	kfree(poolm);
+}
+
+static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
+	.alloc = pool_ffa_op_alloc,
+	.free = pool_ffa_op_free,
+	.destroy_poolmgr = pool_ffa_op_destroy_poolmgr,
+};
+
+/**
+ * optee_ffa_shm_pool_alloc_pages() - create page-based allocator pool
+ *
+ * This pool is used with OP-TEE over FF-A. In this case command buffers
+ * and such are allocated from kernel's own memory.
+ */
+static struct tee_shm_pool_mgr *optee_ffa_shm_pool_alloc_pages(void)
+{
+	struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+
+	if (!mgr)
+		return ERR_PTR(-ENOMEM);
+
+	mgr->ops = &pool_ffa_ops;
+
+	return mgr;
+}
+
+/*
+ * 5. Do a normal scheduled call into secure world
+ *
+ * The function optee_ffa_do_call_with_arg() performs a normal scheduled
+ * call into secure world. During this call may normal world request help
+ * from normal world using RPCs, Remote Procedure Calls. This includes
+ * delivery of non-secure interrupts to for instance allow rescheduling of
+ * the current task.
+ */
+
+static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
+					      struct optee_msg_arg *arg)
+{
+	struct tee_shm *shm;
+
+	if (arg->num_params != 1 ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	switch (arg->params[0].u.value.a) {
+	case OPTEE_RPC_SHM_TYPE_APPL:
+		shm = optee_rpc_cmd_alloc_suppl(ctx, arg->params[0].u.value.b);
+		break;
+	case OPTEE_RPC_SHM_TYPE_KERNEL:
+		shm = tee_shm_alloc(ctx, arg->params[0].u.value.b,
+				    TEE_SHM_MAPPED);
+		break;
+	default:
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	if (IS_ERR(shm)) {
+		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+		return;
+	}
+
+	arg->params[0] = (struct optee_msg_param){
+		.attr = OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT,
+		.u.fmem.size = tee_shm_get_size(shm),
+		.u.fmem.global_id = shm->sec_world_id,
+		.u.fmem.internal_offs = shm->offset,
+	};
+
+	arg->ret = TEEC_SUCCESS;
+}
+
+static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx,
+					     struct optee *optee,
+					     struct optee_msg_arg *arg)
+{
+	struct tee_shm *shm;
+
+	if (arg->num_params != 1 ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
+		goto err_bad_param;
+
+	shm = optee_shm_from_ffa_handle(optee, arg->params[0].u.value.b);
+	if (!shm)
+		goto err_bad_param;
+	switch (arg->params[0].u.value.a) {
+	case OPTEE_RPC_SHM_TYPE_APPL:
+		optee_rpc_cmd_free_suppl(ctx, shm);
+		break;
+	case OPTEE_RPC_SHM_TYPE_KERNEL:
+		tee_shm_free(shm);
+		break;
+	default:
+		goto err_bad_param;
+	}
+	arg->ret = TEEC_SUCCESS;
+	return;
+
+err_bad_param:
+	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+}
+
+static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,
+				    struct optee_msg_arg *arg)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+
+	arg->ret_origin = TEEC_ORIGIN_COMMS;
+	switch (arg->cmd) {
+	case OPTEE_RPC_CMD_SHM_ALLOC:
+		handle_ffa_rpc_func_cmd_shm_alloc(ctx, arg);
+		break;
+	case OPTEE_RPC_CMD_SHM_FREE:
+		handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg);
+		break;
+	default:
+		optee_rpc_cmd(ctx, optee, arg);
+	}
+}
+
+static void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,
+				 struct optee_msg_arg *arg)
+{
+	switch (cmd) {
+	case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD:
+		handle_ffa_rpc_func_cmd(ctx, arg);
+		break;
+	case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT:
+		/* Interrupt delivered by now */
+		break;
+	default:
+		pr_warn("Unknown RPC func 0x%x\n", cmd);
+		break;
+	}
+}
+
+static int optee_ffa_yielding_call(struct tee_context *ctx,
+				   struct ffa_send_direct_data *data,
+				   struct optee_msg_arg *rpc_arg)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
+	struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+	struct optee_call_waiter w;
+	u32 cmd = data->data0;
+	u32 w4 = data->data1;
+	u32 w5 = data->data2;
+	u32 w6 = data->data3;
+	int rc;
+
+	/* Initialize waiter */
+	optee_cq_wait_init(&optee->call_queue, &w);
+	while (true) {
+		rc = ffa_ops->sync_send_receive(ffa_dev, data);
+		if (rc)
+			goto done;
+
+		switch ((int)data->data0) {
+		case TEEC_SUCCESS:
+			break;
+		case TEEC_ERROR_BUSY:
+			if (cmd == OPTEE_FFA_YIELDING_CALL_RESUME) {
+				rc = -EIO;
+				goto done;
+			}
+
+			/*
+			 * Out of threads in secure world, wait for a thread
+			 * become available.
+			 */
+			optee_cq_wait_for_completion(&optee->call_queue, &w);
+			data->data0 = cmd;
+			data->data1 = w4;
+			data->data2 = w5;
+			data->data3 = w6;
+			continue;
+		default:
+			rc = -EIO;
+			goto done;
+		}
+
+		if (data->data1 == OPTEE_FFA_YIELDING_CALL_RETURN_DONE)
+			goto done;
+
+		/*
+		 * OP-TEE has returned with a RPC request.
+		 *
+		 * Note that data->data4 (passed in register w7) is already
+		 * filled in by ffa_ops->sync_send_receive() returning
+		 * above.
+		 */
+		cond_resched();
+		optee_handle_ffa_rpc(ctx, data->data1, rpc_arg);
+		cmd = OPTEE_FFA_YIELDING_CALL_RESUME;
+		data->data0 = cmd;
+		data->data1 = 0;
+		data->data2 = 0;
+		data->data3 = 0;
+	}
+done:
+	/*
+	 * We're done with our thread in secure world, if there's any
+	 * thread waiters wake up one.
+	 */
+	optee_cq_wait_final(&optee->call_queue, &w);
+
+	return rc;
+}
+
+/**
+ * optee_ffa_do_call_with_arg() - Do a FF-A call to enter OP-TEE in secure world
+ * @ctx:	calling context
+ * @shm:	shared memory holding the message to pass to secure world
+ *
+ * Does a FF-A call to OP-TEE in secure world and handles eventual resulting
+ * Remote Procedure Calls (RPC) from OP-TEE.
+ *
+ * Returns return code from FF-A, 0 is OK
+ */
+
+static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
+				      struct tee_shm *shm)
+{
+	struct ffa_send_direct_data data = {
+		.data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG,
+		.data1 = (u32)shm->sec_world_id,
+		.data2 = (u32)(shm->sec_world_id >> 32),
+		.data3 = shm->offset,
+	};
+	struct optee_msg_arg *arg = tee_shm_get_va(shm, 0);
+	unsigned int rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
+	struct optee_msg_arg *rpc_arg = tee_shm_get_va(shm, rpc_arg_offs);
+
+	return optee_ffa_yielding_call(ctx, &data, rpc_arg);
+}
+
+/*
+ * 6. Driver initialization
+ *
+ * During driver inititialization is the OP-TEE Secure Partition is probed
+ * to find out which features it supports so the driver can be initialized
+ * with a matching configuration.
+ */
+
+static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
+					const struct ffa_dev_ops *ops)
+{
+	struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
+	int rc;
+
+	ops->mode_32bit_set(ffa_dev);
+
+	rc = ops->sync_send_receive(ffa_dev, &data);
+	if (rc) {
+		pr_err("Unexpected error %d\n", rc);
+		return false;
+	}
+	if (data.data0 != OPTEE_FFA_VERSION_MAJOR ||
+	    data.data1 < OPTEE_FFA_VERSION_MINOR) {
+		pr_err("Incompatible OP-TEE API version %lu.%lu",
+		       data.data0, data.data1);
+		return false;
+	}
+
+	data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
+	rc = ops->sync_send_receive(ffa_dev, &data);
+	if (rc) {
+		pr_err("Unexpected error %d\n", rc);
+		return false;
+	}
+	if (data.data2)
+		pr_info("revision %lu.%lu (%08lx)",
+			data.data0, data.data1, data.data2);
+	else
+		pr_info("revision %lu.%lu", data.data0, data.data1);
+
+	return true;
+}
+
+static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
+				    const struct ffa_dev_ops *ops,
+				    unsigned int *rpc_arg_count)
+{
+	struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
+	int rc;
+
+	rc = ops->sync_send_receive(ffa_dev, &data);
+	if (rc) {
+		pr_err("Unexpected error %d", rc);
+		return false;
+	}
+	if (data.data0) {
+		pr_err("Unexpected exchange error %lu", data.data0);
+		return false;
+	}
+
+	*rpc_arg_count = (u8)data.data1;
+
+	return true;
+}
+
+static struct tee_shm_pool *optee_ffa_config_dyn_shm(void)
+{
+	struct tee_shm_pool_mgr *priv_mgr;
+	struct tee_shm_pool_mgr *dmabuf_mgr;
+	void *rc;
+
+	rc = optee_ffa_shm_pool_alloc_pages();
+	if (IS_ERR(rc))
+		return rc;
+	priv_mgr = rc;
+
+	rc = optee_ffa_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 void optee_ffa_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 | TEE_GEN_CAP_REG_MEM |
+			    TEE_GEN_CAP_MEMREF_NULL,
+	};
+
+	*vers = v;
+}
+
+static int optee_ffa_open(struct tee_context *ctx)
+{
+	return optee_open(ctx, true);
+}
+
+static const struct tee_driver_ops optee_ffa_clnt_ops = {
+	.get_version = optee_ffa_get_version,
+	.open = optee_ffa_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_ffa_shm_register,
+	.shm_unregister = optee_ffa_shm_unregister,
+};
+
+static const struct tee_desc optee_ffa_clnt_desc = {
+	.name = DRIVER_NAME "-ffa-clnt",
+	.ops = &optee_ffa_clnt_ops,
+	.owner = THIS_MODULE,
+};
+
+static const struct tee_driver_ops optee_ffa_supp_ops = {
+	.get_version = optee_ffa_get_version,
+	.open = optee_ffa_open,
+	.release = optee_release_supp,
+	.supp_recv = optee_supp_recv,
+	.supp_send = optee_supp_send,
+	.shm_register = optee_ffa_shm_register, /* same as for clnt ops */
+	.shm_unregister = optee_ffa_shm_unregister_supp,
+};
+
+static const struct tee_desc optee_ffa_supp_desc = {
+	.name = DRIVER_NAME "-ffa-supp",
+	.ops = &optee_ffa_supp_ops,
+	.owner = THIS_MODULE,
+	.flags = TEE_DESC_PRIVILEGED,
+};
+
+static const struct optee_ops optee_ffa_ops = {
+	.do_call_with_arg = optee_ffa_do_call_with_arg,
+	.to_msg_param = optee_ffa_to_msg_param,
+	.from_msg_param = optee_ffa_from_msg_param,
+};
+
+static void optee_ffa_remove(struct ffa_device *ffa_dev)
+{
+	struct optee *optee = ffa_dev->dev.driver_data;
+
+	optee_remove_common(optee);
+
+	mutex_destroy(&optee->ffa.mutex);
+	rhashtable_free_and_destroy(&optee->ffa.global_ids, rh_free_fn, NULL);
+
+	kfree(optee);
+}
+
+static int optee_ffa_probe(struct ffa_device *ffa_dev)
+{
+	const struct ffa_dev_ops *ffa_ops;
+	unsigned int rpc_arg_count;
+	struct tee_device *teedev;
+	struct optee *optee;
+	int rc;
+
+	ffa_ops = ffa_dev_ops_get(ffa_dev);
+	if (!ffa_ops) {
+		pr_warn("failed \"method\" init: ffa\n");
+		return -ENOENT;
+	}
+
+	if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops))
+		return -EINVAL;
+
+	if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &rpc_arg_count))
+		return -EINVAL;
+
+	optee = kzalloc(sizeof(*optee), GFP_KERNEL);
+	if (!optee) {
+		rc = -ENOMEM;
+		goto err;
+	}
+	optee->pool = optee_ffa_config_dyn_shm();
+	if (IS_ERR(optee->pool)) {
+		rc = PTR_ERR(optee->pool);
+		optee->pool = NULL;
+		goto err;
+	}
+
+	optee->ops = &optee_ffa_ops;
+	optee->ffa.ffa_dev = ffa_dev;
+	optee->ffa.ffa_ops = ffa_ops;
+	optee->rpc_arg_count = rpc_arg_count;
+
+	teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool,
+				  optee);
+	if (IS_ERR(teedev)) {
+		rc = PTR_ERR(teedev);
+		goto err;
+	}
+	optee->teedev = teedev;
+
+	teedev = tee_device_alloc(&optee_ffa_supp_desc, NULL, optee->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;
+
+	rc = rhashtable_init(&optee->ffa.global_ids, &shm_rhash_params);
+	if (rc)
+		goto err;
+	mutex_init(&optee->ffa.mutex);
+	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);
+	ffa_dev_set_drvdata(ffa_dev, optee);
+
+	rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
+	if (rc) {
+		optee_ffa_remove(ffa_dev);
+		return rc;
+	}
+
+	pr_info("initialized driver\n");
+	return 0;
+err:
+	/*
+	 * 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);
+	if (optee->pool)
+		tee_shm_pool_free(optee->pool);
+	kfree(optee);
+	return rc;
+}
+
+static const struct ffa_device_id optee_ffa_device_id[] = {
+	/* 486178e0-e7f8-11e3-bc5e0002a5d5c51b */
+	{ UUID_INIT(0x486178e0, 0xe7f8, 0x11e3,
+		    0xbc, 0x5e, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b) },
+	{}
+};
+
+static struct ffa_driver optee_ffa_driver = {
+	.name = "optee",
+	.probe = optee_ffa_probe,
+	.remove = optee_ffa_remove,
+	.id_table = optee_ffa_device_id,
+};
+
+int optee_ffa_abi_register(void)
+{
+	return ffa_register(&optee_ffa_driver);
+}
+
+void optee_ffa_abi_unregister(void)
+{
+	ffa_unregister(&optee_ffa_driver);
+}
diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h
new file mode 100644
index 000000000000..ee3a03fc392c
--- /dev/null
+++ b/drivers/tee/optee/optee_ffa.h
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (c) 2019-2021, Linaro Limited
+ */
+
+/*
+ * This file is exported by OP-TEE and is kept in sync between secure world
+ * and normal world drivers. We're using ARM FF-A 1.0 specification.
+ */
+
+#ifndef __OPTEE_FFA_H
+#define __OPTEE_FFA_H
+
+#include <linux/arm_ffa.h>
+
+/*
+ * Normal world sends requests with FFA_MSG_SEND_DIRECT_REQ and
+ * responses are returned with FFA_MSG_SEND_DIRECT_RESP for normal
+ * messages.
+ *
+ * All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP
+ * are using the AArch32 SMC calling convention with register usage as
+ * defined in FF-A specification:
+ * w0:    Function ID (0x8400006F or 0x84000070)
+ * w1:    Source/Destination IDs
+ * w2:    Reserved (MBZ)
+ * w3-w7: Implementation defined, free to be used below
+ */
+
+#define OPTEE_FFA_VERSION_MAJOR	1
+#define OPTEE_FFA_VERSION_MINOR	0
+
+#define OPTEE_FFA_BLOCKING_CALL(id)	(id)
+#define OPTEE_FFA_YIELDING_CALL_BIT	31
+#define OPTEE_FFA_YIELDING_CALL(id)	((id) | BIT(OPTEE_FFA_YIELDING_CALL_BIT))
+
+/*
+ * Returns the API version implemented, currently follows the FF-A version.
+ * Call register usage:
+ * w3:    Service ID, OPTEE_FFA_GET_API_VERSION
+ * w4-w7: Not used (MBZ)
+ *
+ * Return register usage:
+ * w3:    OPTEE_FFA_VERSION_MAJOR
+ * w4:    OPTEE_FFA_VERSION_MINOR
+ * w5-w7: Not used (MBZ)
+ */
+#define OPTEE_FFA_GET_API_VERSION	OPTEE_FFA_BLOCKING_CALL(0)
+
+/*
+ * Returns the revision of OP-TEE.
+ *
+ * Used by non-secure world to figure out which version of the Trusted OS
+ * is installed. Note that the returned revision is the revision of the
+ * Trusted OS, not of the API.
+ *
+ * Call register usage:
+ * w3:    Service ID, OPTEE_FFA_GET_OS_VERSION
+ * w4-w7: Unused (MBZ)
+ *
+ * Return register usage:
+ * w3:    CFG_OPTEE_REVISION_MAJOR
+ * w4:    CFG_OPTEE_REVISION_MINOR
+ * w5:    TEE_IMPL_GIT_SHA1 (or zero if not supported)
+ */
+#define OPTEE_FFA_GET_OS_VERSION	OPTEE_FFA_BLOCKING_CALL(1)
+
+/*
+ * Exchange capabilities between normal world and secure world.
+ *
+ * Currently there are no defined capabilities. When features are added new
+ * capabilities may be added.
+ *
+ * Call register usage:
+ * w3:    Service ID, OPTEE_FFA_EXCHANGE_CAPABILITIES
+ * w4-w7: Note used (MBZ)
+ *
+ * Return register usage:
+ * w3:    Error code, 0 on success
+ * w4:    Bit[7:0]:  Number of parameters needed for RPC to be supplied
+ *                   as the second MSG arg struct for
+ *                   OPTEE_FFA_YIELDING_CALL_WITH_ARG.
+ *        Bit[31:8]: Reserved (MBZ)
+ * w5-w7: Note used (MBZ)
+ */
+#define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
+
+/*
+ * Unregister shared memory
+ *
+ * Call register usage:
+ * w3:    Service ID, OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM
+ * w4:    Shared memory handle, lower bits
+ * w5:    Shared memory handle, higher bits
+ * w6-w7: Not used (MBZ)
+ *
+ * Return register usage:
+ * w3:    Error code, 0 on success
+ * w4-w7: Note used (MBZ)
+ */
+#define OPTEE_FFA_UNREGISTER_SHM	OPTEE_FFA_BLOCKING_CALL(3)
+
+/*
+ * Call with struct optee_msg_arg as argument in the supplied shared memory
+ * with a zero internal offset and normal cached memory attributes.
+ * Register usage:
+ * w3:    Service ID, OPTEE_FFA_YIELDING_CALL_WITH_ARG
+ * w4:    Lower 32 bits of a 64-bit Shared memory handle
+ * w5:    Upper 32 bits of a 64-bit Shared memory handle
+ * w6:    Offset into shared memory pointing to a struct optee_msg_arg
+ *	  right after the parameters of this struct (at offset
+ *	  OPTEE_MSG_GET_ARG_SIZE(num_params) follows a struct optee_msg_arg
+ *	  for RPC, this struct has reserved space for the number of RPC
+ *	  parameters as returned by OPTEE_FFA_EXCHANGE_CAPABILITIES.
+ * w7:    Not used (MBZ)
+ * Resume from RPC. Register usage:
+ * w3:    Service ID, OPTEE_FFA_YIELDING_CALL_RESUME
+ * w4-w6: Not used (MBZ)
+ * w7:    Resume info
+ *
+ * Normal return (yielding call is completed). Register usage:
+ * w3:    Error code, 0 on success
+ * w4:    OPTEE_FFA_YIELDING_CALL_RETURN_DONE
+ * w5-w7: Not used (MBZ)
+ *
+ * RPC interrupt return (RPC from secure world). Register usage:
+ * w3:    Error code == 0
+ * w4:    Any defined RPC code but OPTEE_FFA_YIELDING_CALL_RETURN_DONE
+ * w5-w6: Not used (MBZ)
+ * w7:    Resume info
+ *
+ * Possible error codes in register w3:
+ * 0:                       Success
+ * FFA_DENIED:              w4 isn't one of OPTEE_FFA_YIELDING_CALL_START
+ *                          OPTEE_FFA_YIELDING_CALL_RESUME
+ *
+ * Possible error codes for OPTEE_FFA_YIELDING_CALL_START,
+ * FFA_BUSY:               Number of OP-TEE OS threads exceeded,
+ *                         try again later
+ * FFA_DENIED:             RPC shared memory object not found
+ * FFA_INVALID_PARAMETER:  Bad shared memory handle or offset into the memory
+ *
+ * Possible error codes for OPTEE_FFA_YIELDING_CALL_RESUME
+ * FFA_INVALID_PARAMETER:  Bad resume info
+ */
+#define OPTEE_FFA_YIELDING_CALL_WITH_ARG	OPTEE_FFA_YIELDING_CALL(0)
+#define OPTEE_FFA_YIELDING_CALL_RESUME		OPTEE_FFA_YIELDING_CALL(1)
+
+#define OPTEE_FFA_YIELDING_CALL_RETURN_DONE		0
+#define OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD		1
+#define OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT	2
+
+#endif /*__OPTEE_FFA_H*/
diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h
index e3d72d09c484..2422e185d400 100644
--- a/drivers/tee/optee/optee_msg.h
+++ b/drivers/tee/optee/optee_msg.h
@@ -28,6 +28,9 @@
 #define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT		0x5
 #define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT		0x6
 #define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT		0x7
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT		OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT		OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT
+#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT		OPTEE_MSG_ATTR_TYPE_RMEM_INOUT
 #define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT		0x9
 #define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT		0xa
 #define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT		0xb
@@ -96,6 +99,8 @@
  */
 #define OPTEE_MSG_NONCONTIG_PAGE_SIZE		4096
 
+#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID	0xffffffffffffffff
+
 /**
  * struct optee_msg_param_tmem - temporary memory reference parameter
  * @buf_ptr:	Address of the buffer
@@ -127,6 +132,23 @@ struct optee_msg_param_rmem {
 	u64 shm_ref;
 };
 
+/**
+ * struct optee_msg_param_fmem - ffa memory reference parameter
+ * @offs_lower:	   Lower bits of offset into shared memory reference
+ * @offs_upper:	   Upper bits of offset into shared memory reference
+ * @internal_offs: Internal offset into the first page of shared memory
+ *		   reference
+ * @size:	   Size of the buffer
+ * @global_id:	   Global identifier of Shared memory
+ */
+struct optee_msg_param_fmem {
+	u32 offs_low;
+	u16 offs_high;
+	u16 internal_offs;
+	u64 size;
+	u64 global_id;
+};
+
 /**
  * struct optee_msg_param_value - opaque value parameter
  *
@@ -143,13 +165,15 @@ struct optee_msg_param_value {
  * @attr:	attributes
  * @tmem:	parameter by temporary memory reference
  * @rmem:	parameter by registered memory reference
+ * @fmem:	parameter by ffa registered memory reference
  * @value:	parameter by opaque value
  * @octets:	parameter by octet string
  *
  * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
  * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets,
  * OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
- * OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
+ * OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates
+ * @rmem or @fmem depending on the conduit.
  * OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
  */
 struct optee_msg_param {
@@ -157,6 +181,7 @@ struct optee_msg_param {
 	union {
 		struct optee_msg_param_tmem tmem;
 		struct optee_msg_param_rmem rmem;
+		struct optee_msg_param_fmem fmem;
 		struct optee_msg_param_value value;
 		u8 octets[24];
 	} u;
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index ca0213e330b5..2593742364da 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -7,6 +7,7 @@
 #define OPTEE_PRIVATE_H
 
 #include <linux/arm-smccc.h>
+#include <linux/rhashtable.h>
 #include <linux/semaphore.h>
 #include <linux/tee_drv.h>
 #include <linux/types.h>
@@ -22,6 +23,7 @@
 #define TEEC_ERROR_NOT_SUPPORTED	0xFFFF000A
 #define TEEC_ERROR_COMMUNICATION	0xFFFF000E
 #define TEEC_ERROR_OUT_OF_MEMORY	0xFFFF000C
+#define TEEC_ERROR_BUSY			0xFFFF000D
 #define TEEC_ERROR_SHORT_BUFFER		0xFFFF0010
 
 #define TEEC_ORIGIN_COMMS		0x00000002
@@ -73,19 +75,28 @@ struct optee_supp {
 	struct completion reqs_c;
 };
 
-/**
- * struct optee_smc - SMC ABI specifics
- * @invoke_fn:		function to issue smc or hvc
- * @memremaped_shm	virtual address of memory in shared memory pool
- * @sec_caps:		secure world capabilities defined by
- *			OPTEE_SMC_SEC_CAP_* in optee_smc.h
- */
 struct optee_smc {
 	optee_invoke_fn *invoke_fn;
 	void *memremaped_shm;
 	u32 sec_caps;
 };
 
+/**
+ * struct optee_ffa_data -  FFA communication struct
+ * @ffa_dev		FFA device, contains the destination id, the id of
+ *			OP-TEE in secure world
+ * @ffa_ops		FFA operations
+ * @mutex		Serializes access to @global_ids
+ * @global_ids		FF-A shared memory global handle translation
+ */
+struct optee_ffa {
+	struct ffa_device *ffa_dev;
+	const struct ffa_dev_ops *ffa_ops;
+	/* Serializes access to @global_ids */
+	struct mutex mutex;
+	struct rhashtable global_ids;
+};
+
 struct optee;
 
 /**
@@ -116,11 +127,13 @@ struct optee_ops {
  *			world
  * @teedev:		client device
  * @smc:		specific to SMC ABI
+ * @ffa:		specific to FF-A ABI
  * @call_queue:		queue of threads waiting to call @invoke_fn
  * @wait_queue:		queue of threads from secure world waiting for a
  *			secure world sync object
  * @supp:		supplicant synchronization struct for RPC to supplicant
  * @pool:		shared memory pool
+ * @rpc_arg_count:	If > 0 number of RPC parameters to make room for
  * @scan_bus_done	flag if device registation was already done.
  * @scan_bus_wq		workqueue to scan optee bus and register optee drivers
  * @scan_bus_work	workq to scan optee bus and register optee drivers
@@ -129,11 +142,17 @@ struct optee {
 	struct tee_device *supp_teedev;
 	struct tee_device *teedev;
 	const struct optee_ops *ops;
-	struct optee_smc smc;
+	union {
+		struct optee_smc smc;
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+		struct optee_ffa ffa;
+#endif
+	};
 	struct optee_call_queue call_queue;
 	struct optee_wait_queue wait_queue;
 	struct optee_supp supp;
 	struct tee_shm_pool *pool;
+	unsigned int rpc_arg_count;
 	bool   scan_bus_done;
 	struct workqueue_struct *scan_bus_wq;
 	struct work_struct scan_bus_work;
@@ -266,4 +285,12 @@ static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
 int optee_smc_abi_register(void);
 void optee_smc_abi_unregister(void);
 
+#ifdef CONFIG_ARM_FFA_TRANSPORT
+int optee_ffa_abi_register(void);
+void optee_ffa_abi_unregister(void);
+#else
+static inline int optee_ffa_abi_register(void) { return -EOPNOTSUPP; }
+static inline void optee_ffa_abi_unregister(void) {}
+#endif
+
 #endif /*OPTEE_PRIVATE_H*/
-- 
2.31.1