Merge tag 'optee-ffa-for-v5.16' of git://git.linaro.org/people/jens.wiklander/linux-tee into arm/drivers

Add FF-A support in OP-TEE driver

Adds supports for the OP-TEE driver to communicate with secure world
using FF-A [1] as transport.

[1] https://developer.arm.com/documentation/den0077/latest

* tag 'optee-ffa-for-v5.16' of git://git.linaro.org/people/jens.wiklander/linux-tee:
optee: add FF-A support
optee: isolate smc abi
optee: refactor driver with internal callbacks
optee: simplify optee_release()
tee: add sec_world_id to struct tee_shm
tee: optee: Fix missing devices unregister during optee_remove
tee/optee/shm_pool: fix application of sizeof to pointer

Link: https://lore.kernel.org/r/20211018121324.GA2943530@jade
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/tee/optee/Makefile

···
 optee-objs += call.o
 optee-objs += rpc.o
 optee-objs += supp.o
-optee-objs += shm_pool.o
 optee-objs += device.o
+optee-objs += smc_abi.o
+optee-objs += ffa_abi.o
 
 # for tracing framework to find optee_trace.h
-CFLAGS_call.o := -I$(src)
+CFLAGS_smc_abi.o := -I$(src)

drivers/tee/optee/call.c

···
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
  */
-#include <linux/arm-smccc.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/mm.h>
-#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/tee_drv.h>
 #include <linux/types.h>
-#include <linux/uaccess.h>
 #include "optee_private.h"
-#include "optee_smc.h"
-#define CREATE_TRACE_POINTS
-#include "optee_trace.h"
 
-struct optee_call_waiter {
-	struct list_head list_node;
-	struct completion c;
-};
-
-static void optee_cq_wait_init(struct optee_call_queue *cq,
-			       struct optee_call_waiter *w)
+void optee_cq_wait_init(struct optee_call_queue *cq,
+			struct optee_call_waiter *w)
 {
 	/*
 	 * We're preparing to make a call to secure world. In case we can't
···
 	mutex_unlock(&cq->mutex);
 }
 
-static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
-					 struct optee_call_waiter *w)
+void optee_cq_wait_for_completion(struct optee_call_queue *cq,
+				  struct optee_call_waiter *w)
 {
 	wait_for_completion(&w->c);
 
···
 	}
 }
 
-static void optee_cq_wait_final(struct optee_call_queue *cq,
-				struct optee_call_waiter *w)
+void optee_cq_wait_final(struct optee_call_queue *cq,
+			 struct optee_call_waiter *w)
 {
 	/*
 	 * We're done with the call to secure world. The thread in secure
···
 	return NULL;
 }
 
-/**
- * optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world
- * @ctx:	calling context
- * @parg:	physical address of message to pass to secure world
- *
- * Does and SMC to OP-TEE in secure world and handles eventual resulting
- * Remote Procedure Calls (RPC) from OP-TEE.
- *
- * Returns return code from secure world, 0 is OK
- */
-u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
+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);
-	struct optee_call_waiter w;
-	struct optee_rpc_param param = { };
-	struct optee_call_ctx call_ctx = { };
-	u32 ret;
-
-	param.a0 = OPTEE_SMC_CALL_WITH_ARG;
-	reg_pair_from_64(&param.a1, &param.a2, parg);
-	/* Initialize waiter */
-	optee_cq_wait_init(&optee->call_queue, &w);
-	while (true) {
-		struct arm_smccc_res res;
-
-		trace_optee_invoke_fn_begin(&param);
-		optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
-				 param.a4, param.a5, param.a6, param.a7,
-				 &res);
-		trace_optee_invoke_fn_end(&param, &res);
-
-		if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
-			/*
-			 * Out of threads in secure world, wait for a thread
-			 * become available.
-			 */
-			optee_cq_wait_for_completion(&optee->call_queue, &w);
-		} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
-			cond_resched();
-			param.a0 = res.a0;
-			param.a1 = res.a1;
-			param.a2 = res.a2;
-			param.a3 = res.a3;
-			optee_handle_rpc(ctx, &param, &call_ctx);
-		} else {
-			ret = res.a0;
-			break;
-		}
-	}
-
-	optee_rpc_finalize_call(&call_ctx);
-	/*
-	 * 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 ret;
-}
-
-static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
-				   struct optee_msg_arg **msg_arg,
-				   phys_addr_t *msg_parg)
-{
-	int rc;
+	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 | TEE_SHM_PRIV);
+	/*
+	 * 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 | TEE_SHM_PRIV);
 	if (IS_ERR(shm))
 		return shm;
 
 	ma = tee_shm_get_va(shm, 0);
 	if (IS_ERR(ma)) {
-		rc = PTR_ERR(ma);
-		goto out;
+		tee_shm_free(shm);
+		return (void *)ma;
 	}
-
-	rc = tee_shm_get_pa(shm, 0, msg_parg);
-	if (rc)
-		goto out;
 
 	memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
 	ma->num_params = num_params;
 	*msg_arg = ma;
-out:
-	if (rc) {
-		tee_shm_free(shm);
-		return ERR_PTR(rc);
-	}
 
 	return shm;
 }
···
 		       struct tee_ioctl_open_session_arg *arg,
 		       struct tee_param *param)
 {
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct optee_context_data *ctxdata = ctx->data;
 	int rc;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
-	phys_addr_t msg_parg;
 	struct optee_session *sess = NULL;
 	uuid_t client_uuid;
 
 	/* +2 for the meta parameters added below */
-	shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
+	shm = optee_get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);
 
···
 		goto out;
 	export_uuid(msg_arg->params[1].u.octets, &client_uuid);
 
-	rc = optee_to_msg_param(msg_arg->params + 2, arg->num_params, param);
+	rc = optee->ops->to_msg_param(optee, msg_arg->params + 2,
+				      arg->num_params, param);
 	if (rc)
 		goto out;
 
···
 		goto out;
 	}
 
-	if (optee_do_call_with_arg(ctx, msg_parg)) {
+	if (optee->ops->do_call_with_arg(ctx, shm)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}
···
 		kfree(sess);
 	}
 
-	if (optee_from_msg_param(param, arg->num_params, msg_arg->params + 2)) {
+	if (optee->ops->from_msg_param(optee, param, arg->num_params,
+				       msg_arg->params + 2)) {
 		arg->ret = TEEC_ERROR_COMMUNICATION;
 		arg->ret_origin = TEEC_ORIGIN_COMMS;
 		/* Close session again to avoid leakage */
···
 	return rc;
 }
 
+int optee_close_session_helper(struct tee_context *ctx, u32 session)
+{
+	struct tee_shm *shm;
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	struct optee_msg_arg *msg_arg;
+
+	shm = optee_get_msg_arg(ctx, 0, &msg_arg);
+	if (IS_ERR(shm))
+		return PTR_ERR(shm);
+
+	msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
+	msg_arg->session = session;
+	optee->ops->do_call_with_arg(ctx, shm);
+
+	tee_shm_free(shm);
+
+	return 0;
+}
+
 int optee_close_session(struct tee_context *ctx, u32 session)
 {
 	struct optee_context_data *ctxdata = ctx->data;
-	struct tee_shm *shm;
-	struct optee_msg_arg *msg_arg;
-	phys_addr_t msg_parg;
 	struct optee_session *sess;
 
 	/* Check that the session is valid and remove it from the list */
···
 		return -EINVAL;
 	kfree(sess);
 
-	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
-	if (IS_ERR(shm))
-		return PTR_ERR(shm);
-
-	msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
-	msg_arg->session = session;
-	optee_do_call_with_arg(ctx, msg_parg);
-
-	tee_shm_free(shm);
-	return 0;
+	return optee_close_session_helper(ctx, session);
 }
 
 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
 		      struct tee_param *param)
 {
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct optee_context_data *ctxdata = ctx->data;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
-	phys_addr_t msg_parg;
 	struct optee_session *sess;
 	int rc;
 
···
 	if (!sess)
 		return -EINVAL;
 
-	shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg);
+	shm = optee_get_msg_arg(ctx, arg->num_params, &msg_arg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);
 	msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
···
 	msg_arg->session = arg->session;
 	msg_arg->cancel_id = arg->cancel_id;
 
-	rc = optee_to_msg_param(msg_arg->params, arg->num_params, param);
+	rc = optee->ops->to_msg_param(optee, msg_arg->params, arg->num_params,
+				      param);
 	if (rc)
 		goto out;
 
-	if (optee_do_call_with_arg(ctx, msg_parg)) {
+	if (optee->ops->do_call_with_arg(ctx, shm)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}
 
-	if (optee_from_msg_param(param, arg->num_params, msg_arg->params)) {
+	if (optee->ops->from_msg_param(optee, param, arg->num_params,
+				       msg_arg->params)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}
···
 
 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
 {
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct optee_context_data *ctxdata = ctx->data;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
-	phys_addr_t msg_parg;
 	struct optee_session *sess;
 
 	/* Check that the session is valid */
···
 	if (!sess)
 		return -EINVAL;
 
-	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
+	shm = optee_get_msg_arg(ctx, 0, &msg_arg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);
 
 	msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
 	msg_arg->session = session;
 	msg_arg->cancel_id = cancel_id;
-	optee_do_call_with_arg(ctx, msg_parg);
+	optee->ops->do_call_with_arg(ctx, shm);
 
 	tee_shm_free(shm);
 	return 0;
-}
-
-/**
- * optee_enable_shm_cache() - Enables caching of some shared memory allocation
- *			      in OP-TEE
- * @optee:	main service struct
- */
-void optee_enable_shm_cache(struct optee *optee)
-{
-	struct optee_call_waiter w;
-
-	/* We need to retry until secure world isn't busy. */
-	optee_cq_wait_init(&optee->call_queue, &w);
-	while (true) {
-		struct arm_smccc_res res;
-
-		optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
-				 0, &res);
-		if (res.a0 == OPTEE_SMC_RETURN_OK)
-			break;
-		optee_cq_wait_for_completion(&optee->call_queue, &w);
-	}
-	optee_cq_wait_final(&optee->call_queue, &w);
-}
-
-/**
- * __optee_disable_shm_cache() - Disables caching of some shared memory
- *                               allocation in OP-TEE
- * @optee:	main service struct
- * @is_mapped:	true if the cached shared memory addresses were mapped by this
- *		kernel, are safe to dereference, and should be freed
- */
-static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
-{
-	struct optee_call_waiter w;
-
-	/* We need to retry until secure world isn't busy. */
-	optee_cq_wait_init(&optee->call_queue, &w);
-	while (true) {
-		union {
-			struct arm_smccc_res smccc;
-			struct optee_smc_disable_shm_cache_result result;
-		} res;
-
-		optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
-				 0, &res.smccc);
-		if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
-			break; /* All shm's freed */
-		if (res.result.status == OPTEE_SMC_RETURN_OK) {
-			struct tee_shm *shm;
-
-			/*
-			 * Shared memory references that were not mapped by
-			 * this kernel must be ignored to prevent a crash.
-			 */
-			if (!is_mapped)
-				continue;
-
-			shm = reg_pair_to_ptr(res.result.shm_upper32,
-					      res.result.shm_lower32);
-			tee_shm_free(shm);
-		} else {
-			optee_cq_wait_for_completion(&optee->call_queue, &w);
-		}
-	}
-	optee_cq_wait_final(&optee->call_queue, &w);
-}
-
-/**
- * optee_disable_shm_cache() - Disables caching of mapped shared memory
- *                             allocations in OP-TEE
- * @optee:	main service struct
- */
-void optee_disable_shm_cache(struct optee *optee)
-{
-	return __optee_disable_shm_cache(optee, true);
-}
-
-/**
- * optee_disable_unmapped_shm_cache() - Disables caching of shared memory
- *                                      allocations in OP-TEE which are not
- *                                      currently mapped
- * @optee:	main service struct
- */
-void optee_disable_unmapped_shm_cache(struct optee *optee)
-{
-	return __optee_disable_shm_cache(optee, false);
-}
-
-#define PAGELIST_ENTRIES_PER_PAGE				\
-	((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
-
-/**
- * optee_fill_pages_list() - write list of user pages to given shared
- * buffer.
- *
- * @dst: page-aligned buffer where list of pages will be stored
- * @pages: array of pages that represents shared buffer
- * @num_pages: number of entries in @pages
- * @page_offset: offset of user buffer from page start
- *
- * @dst should be big enough to hold list of user page addresses and
- *	links to the next pages of buffer
- */
-void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
-			   size_t page_offset)
-{
-	int n = 0;
-	phys_addr_t optee_page;
-	/*
-	 * Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
-	 * for details.
-	 */
-	struct {
-		u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
-		u64 next_page_data;
-	} *pages_data;
-
-	/*
-	 * Currently OP-TEE uses 4k page size and it does not looks
-	 * like this will change in the future.  On other hand, there are
-	 * no know ARM architectures with page size < 4k.
-	 * Thus the next built assert looks redundant. But the following
-	 * code heavily relies on this assumption, so it is better be
-	 * safe than sorry.
-	 */
-	BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
-
-	pages_data = (void *)dst;
-	/*
-	 * If linux page is bigger than 4k, and user buffer offset is
-	 * larger than 4k/8k/12k/etc this will skip first 4k pages,
-	 * because they bear no value data for OP-TEE.
-	 */
-	optee_page = page_to_phys(*pages) +
-		round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
-
-	while (true) {
-		pages_data->pages_list[n++] = optee_page;
-
-		if (n == PAGELIST_ENTRIES_PER_PAGE) {
-			pages_data->next_page_data =
-				virt_to_phys(pages_data + 1);
-			pages_data++;
-			n = 0;
-		}
-
-		optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
-		if (!(optee_page & ~PAGE_MASK)) {
-			if (!--num_pages)
-				break;
-			pages++;
-			optee_page = page_to_phys(*pages);
-		}
-	}
-}
-
-/*
- * The final entry in each pagelist page is a pointer to the next
- * pagelist page.
- */
-static size_t get_pages_list_size(size_t num_entries)
-{
-	int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
-
-	return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
-}
-
-u64 *optee_allocate_pages_list(size_t num_entries)
-{
-	return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
-}
-
-void optee_free_pages_list(void *list, size_t num_entries)
-{
-	free_pages_exact(list, get_pages_list_size(num_entries));
 }
 
 static bool is_normal_memory(pgprot_t p)
···
 	return -EINVAL;
 }
 
-static int check_mem_type(unsigned long start, size_t num_pages)
+int optee_check_mem_type(unsigned long start, size_t num_pages)
 {
 	struct mm_struct *mm = current->mm;
 	int rc;
···
 	mmap_read_unlock(mm);
 
 	return rc;
-}
-
-int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
-		       struct page **pages, size_t num_pages,
-		       unsigned long start)
-{
-	struct tee_shm *shm_arg = NULL;
-	struct optee_msg_arg *msg_arg;
-	u64 *pages_list;
-	phys_addr_t msg_parg;
-	int rc;
-
-	if (!num_pages)
-		return -EINVAL;
-
-	rc = check_mem_type(start, num_pages);
-	if (rc)
-		return rc;
-
-	pages_list = optee_allocate_pages_list(num_pages);
-	if (!pages_list)
-		return -ENOMEM;
-
-	shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
-	if (IS_ERR(shm_arg)) {
-		rc = PTR_ERR(shm_arg);
-		goto out;
-	}
-
-	optee_fill_pages_list(pages_list, pages, num_pages,
-			      tee_shm_get_page_offset(shm));
-
-	msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
-	msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
-				OPTEE_MSG_ATTR_NONCONTIG;
-	msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
-	msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
-	/*
-	 * In the least bits of msg_arg->params->u.tmem.buf_ptr we
-	 * store buffer offset from 4k page, as described in OP-TEE ABI.
-	 */
-	msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
-	  (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
-
-	if (optee_do_call_with_arg(ctx, msg_parg) ||
-	    msg_arg->ret != TEEC_SUCCESS)
-		rc = -EINVAL;
-
-	tee_shm_free(shm_arg);
-out:
-	optee_free_pages_list(pages_list, num_pages);
-	return rc;
-}
-
-int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
-{
-	struct tee_shm *shm_arg;
-	struct optee_msg_arg *msg_arg;
-	phys_addr_t msg_parg;
-	int rc = 0;
-
-	shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
-	if (IS_ERR(shm_arg))
-		return PTR_ERR(shm_arg);
-
-	msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
-
-	msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
-	msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
-
-	if (optee_do_call_with_arg(ctx, msg_parg) ||
-	    msg_arg->ret != TEEC_SUCCESS)
-		rc = -EINVAL;
-	tee_shm_free(shm_arg);
-	return rc;
-}
-
-int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
-			    struct page **pages, size_t num_pages,
-			    unsigned long start)
-{
-	/*
-	 * We don't want to register supplicant memory in OP-TEE.
-	 * Instead information about it will be passed in RPC code.
-	 */
-	return check_mem_type(start, num_pages);
-}
-
-int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
-{
-	return 0;
 }

drivers/tee/optee/core.c

···
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/arm-smccc.h>
 #include <linux/crash_dump.h>
 #include <linux/errno.h>
 #include <linux/io.h>
+#include <linux/mm.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 <linux/workqueue.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 optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
+			       struct tee_shm *shm, size_t size,
+			       int (*shm_register)(struct tee_context *ctx,
+						   struct tee_shm *shm,
+						   struct page **pages,
+						   size_t num_pages,
+						   unsigned long start))
 {
-	int rc;
-	size_t n;
-	struct tee_shm *shm;
-	phys_addr_t pa;
+	unsigned int order = get_order(size);
+	struct page *page;
+	int rc = 0;
 
-	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;
+	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+	if (!page)
+		return -ENOMEM;
 
-		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;
-			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;
+	shm->kaddr = page_address(page);
+	shm->paddr = page_to_phys(page);
+	shm->size = PAGE_SIZE << order;
 
-			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;
+	if (shm_register) {
+		unsigned int nr_pages = 1 << order, i;
+		struct page **pages;
 
-			break;
-
-		default:
-			return -EINVAL;
+		pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
+		if (!pages) {
+			rc = -ENOMEM;
+			goto err;
 		}
-	}
-	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;
+		for (i = 0; i < nr_pages; i++) {
+			pages[i] = page;
+			page++;
 		}
+
+		shm->flags |= TEE_SHM_REGISTER;
+		rc = shm_register(shm->ctx, shm, pages, nr_pages,
+				  (unsigned long)shm->kaddr);
+		kfree(pages);
+		if (rc)
+			goto err;
 	}
+
 	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;
-	if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
-		v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
-	*vers = v;
+err:
+	__free_pages(page, order);
+	return rc;
 }
 
 static void optee_bus_scan(struct work_struct *work)
···
 	WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
 }
 
-static int optee_open(struct tee_context *ctx)
+int optee_open(struct tee_context *ctx, bool cap_memref_null)
 {
 	struct optee_context_data *ctxdata;
 	struct tee_device *teedev = ctx->teedev;
···
 	mutex_init(&ctxdata->mutex);
 	INIT_LIST_HEAD(&ctxdata->sess_list);
 
-	if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
-		ctx->cap_memref_null  = true;
-	else
-		ctx->cap_memref_null = false;
-
+	ctx->cap_memref_null = cap_memref_null;
 	ctx->data = ctxdata;
 	return 0;
 }
 
-static void optee_release(struct tee_context *ctx)
+static void optee_release_helper(struct tee_context *ctx,
+				 int (*close_session)(struct tee_context *ctx,
+						      u32 session))
 {
 	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 | TEE_SHM_PRIV);
-	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);
-		}
+		close_session(ctx, sess->session_id);
 		kfree(sess);
 	}
 	kfree(ctxdata);
-
-	if (!IS_ERR(shm))
-		tee_shm_free(shm);
-
 	ctx->data = NULL;
+}
 
-	if (teedev == optee->supp_teedev) {
-		if (optee->scan_bus_wq) {
-			destroy_workqueue(optee->scan_bus_wq);
-			optee->scan_bus_wq = NULL;
-		}
-		optee_supp_release(&optee->supp);
+void optee_release(struct tee_context *ctx)
+{
+	optee_release_helper(ctx, optee_close_session_helper);
+}
+
+void optee_release_supp(struct tee_context *ctx)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+
+	optee_release_helper(ctx, optee_close_session_helper);
+	if (optee->scan_bus_wq) {
+		destroy_workqueue(optee->scan_bus_wq);
+		optee->scan_bus_wq = NULL;
 	}
+	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)
+void optee_remove_common(struct optee *optee)
 {
-	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);
-}
-
-/* optee_remove - Device Removal Routine
- * @pdev: platform device information struct
- *
- * optee_remove is called by platform subsystem to alert the driver
- * that it should release the device
- */
-
-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);
+	/* Unregister OP-TEE specific client devices on TEE bus */
+	optee_unregister_devices();
 
 	/*
 	 * The two devices have to be unregistered before we can free the
···
 	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;
 }
 
-/* optee_shutdown - Device Removal Routine
- * @pdev: platform device information struct
- *
- * platform_shutdown is called by the platform subsystem to alert
- * the driver that a shutdown, reboot, or kexec is happening and
- * device must be disabled.
- */
-static void optee_shutdown(struct platform_device *pdev)
-{
-	optee_disable_shm_cache(platform_get_drvdata(pdev));
-}
+static int smc_abi_rc;
+static int ffa_abi_rc;
 
-static int optee_probe(struct platform_device *pdev)
+static int optee_core_init(void)
 {
-	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;
-
 	/*
 	 * The kernel may have crashed at the same time that all available
 	 * secure world threads were suspended and we cannot reschedule the
···
 	if (is_kdump_kernel())
 		return -ENODEV;
 
-	invoke_fn = get_invoke_func(&pdev->dev);
-	if (IS_ERR(invoke_fn))
-		return PTR_ERR(invoke_fn);
+	smc_abi_rc = optee_smc_abi_register();
+	ffa_abi_rc = optee_ffa_abi_register();
 
-	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;
-
-	/*
-	 * Ensure that there are no pre-existing shm objects before enabling
-	 * the shm cache so that there's no chance of receiving an invalid
-	 * address during shutdown. This could occur, for example, if we're
-	 * kexec booting from an older kernel that did not properly cleanup the
-	 * shm cache.
-	 */
-	optee_disable_unmapped_shm_cache(optee);
-
-	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(PTA_CMD_GET_DEVICES);
-	if (rc) {
-		optee_remove(pdev);
-		return rc;
-	}
-
-	pr_info("initialized driver\n");
+	/* If both failed there's no point with this module */
+	if (smc_abi_rc && ffa_abi_rc)
+		return smc_abi_rc;
 	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;
 }
+module_init(optee_core_init);
 
-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,
-	.shutdown = optee_shutdown,
-	.driver = {
-		.name = "optee",
-		.of_match_table = optee_dt_match,
-	},
-};
-module_platform_driver(optee_driver);
+static void optee_core_exit(void)
+{
+	if (!smc_abi_rc)
+		optee_smc_abi_unregister();
+	if (!ffa_abi_rc)
+		optee_ffa_abi_unregister();
+}
+module_exit(optee_core_exit);
 
 MODULE_AUTHOR("Linaro");
 MODULE_DESCRIPTION("OP-TEE driver");

drivers/tee/optee/device.c

···
 	return 0;
 }
 
+static void optee_release_device(struct device *dev)
+{
+	struct tee_client_device *optee_device = to_tee_client_device(dev);
+
+	kfree(optee_device);
+}
+
 static int optee_register_device(const uuid_t *device_uuid)
 {
 	struct tee_client_device *optee_device = NULL;
···
 		return -ENOMEM;
 
 	optee_device->dev.bus = &tee_bus_type;
+	optee_device->dev.release = optee_release_device;
 	if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
 		kfree(optee_device);
 		return -ENOMEM;
···
 int optee_enumerate_devices(u32 func)
 {
 	return  __optee_enumerate_devices(func);
+}
+
+static int __optee_unregister_device(struct device *dev, void *data)
+{
+	if (!strncmp(dev_name(dev), "optee-ta", strlen("optee-ta")))
+		device_unregister(dev);
+
+	return 0;
+}
+
+void optee_unregister_devices(void)
+{
+	bus_for_each_dev(&tee_bus_type, NULL, NULL,
+			 __optee_unregister_device);
 }

drivers/tee/optee/ffa_abi.c

···
+// 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 following 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 | TEE_SHM_PRIV);
+		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)
+{
+	if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT))
+		return ffa_register(&optee_ffa_driver);
+	else
+		return -EOPNOTSUPP;
+}
+
+void optee_ffa_abi_unregister(void)
+{
+	if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT))
+		ffa_unregister(&optee_ffa_driver);
+}

drivers/tee/optee/optee_ffa.h

···
+/* 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*/

drivers/tee/optee/optee_msg.h

···
 #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
···
  */
 #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
···
 };
 
 /**
+ * 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
  *
  * Value parameters are passed unchecked between normal and secure world.
···
  * @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 {
···
 	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;

drivers/tee/optee/optee_private.h

···
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
  */
 
 #ifndef OPTEE_PRIVATE_H
 #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>
 #include "optee_msg.h"
+
+#define DRIVER_NAME "optee"
 
 #define OPTEE_MAX_ARG_SIZE	1024
 
···
 #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
···
 				unsigned long, unsigned long, unsigned long,
 				unsigned long, unsigned long,
 				struct arm_smccc_res *);
+
+struct optee_call_waiter {
+	struct list_head list_node;
+	struct completion c;
+};
 
 struct optee_call_queue {
 	/* Serializes access to this struct */
···
 	struct completion reqs_c;
 };
 
+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;
+
+/**
+ * struct optee_ops - OP-TEE driver internal operations
+ * @do_call_with_arg:	enters OP-TEE in secure world
+ * @to_msg_param:	converts from struct tee_param to OPTEE_MSG parameters
+ * @from_msg_param:	converts from OPTEE_MSG parameters to struct tee_param
+ *
+ * These OPs are only supposed to be used internally in the OP-TEE driver
+ * as a way of abstracting the different methogs of entering OP-TEE in
+ * secure world.
+ */
+struct optee_ops {
+	int (*do_call_with_arg)(struct tee_context *ctx,
+				struct tee_shm *shm_arg);
+	int (*to_msg_param)(struct optee *optee,
+			    struct optee_msg_param *msg_params,
+			    size_t num_params, const struct tee_param *params);
+	int (*from_msg_param)(struct optee *optee, struct tee_param *params,
+			      size_t num_params,
+			      const struct optee_msg_param *msg_params);
+};
+
 /**
  * struct optee - main service struct
  * @supp_teedev:	supplicant device
+ * @ops:		internal callbacks for different ways to reach secure
+ *			world
  * @teedev:		client device
- * @invoke_fn:		function to issue smc or hvc
+ * @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
- * @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
+ * @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
···
 struct optee {
 	struct tee_device *supp_teedev;
 	struct tee_device *teedev;
-	optee_invoke_fn *invoke_fn;
+	const struct optee_ops *ops;
+	union {
+		struct optee_smc smc;
+		struct optee_ffa ffa;
+	};
 	struct optee_call_queue call_queue;
 	struct optee_wait_queue wait_queue;
 	struct optee_supp supp;
 	struct tee_shm_pool *pool;
-	void *memremaped_shm;
-	u32 sec_caps;
+	unsigned int rpc_arg_count;
 	bool   scan_bus_done;
 	struct workqueue_struct *scan_bus_wq;
 	struct work_struct scan_bus_work;
···
 	size_t num_entries;
 };
 
-void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
-		      struct optee_call_ctx *call_ctx);
-void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx);
-
 void optee_wait_queue_init(struct optee_wait_queue *wq);
 void optee_wait_queue_exit(struct optee_wait_queue *wq);
 
···
 int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
 		    struct tee_param *param);
 
-u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg);
 int optee_open_session(struct tee_context *ctx,
 		       struct tee_ioctl_open_session_arg *arg,
 		       struct tee_param *param);
+int optee_close_session_helper(struct tee_context *ctx, u32 session);
 int optee_close_session(struct tee_context *ctx, u32 session);
 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
 		      struct tee_param *param);
 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
 
-void optee_enable_shm_cache(struct optee *optee);
-void optee_disable_shm_cache(struct optee *optee);
-void optee_disable_unmapped_shm_cache(struct optee *optee);
-
-int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
-		       struct page **pages, size_t num_pages,
-		       unsigned long start);
-int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
-
-int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
-			    struct page **pages, size_t num_pages,
-			    unsigned long start);
-int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm);
-
-int optee_from_msg_param(struct tee_param *params, size_t num_params,
-			 const struct optee_msg_param *msg_params);
-int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
-		       const struct tee_param *params);
-
-u64 *optee_allocate_pages_list(size_t num_entries);
-void optee_free_pages_list(void *array, size_t num_entries);
-void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
-			   size_t page_offset);
-
 #define PTA_CMD_GET_DEVICES		0x0
 #define PTA_CMD_GET_DEVICES_SUPP	0x1
 int optee_enumerate_devices(u32 func);
+void optee_unregister_devices(void);
+
+int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
+			       struct tee_shm *shm, size_t size,
+			       int (*shm_register)(struct tee_context *ctx,
+						   struct tee_shm *shm,
+						   struct page **pages,
+						   size_t num_pages,
+						   unsigned long start));
+
+
+void optee_remove_common(struct optee *optee);
+int optee_open(struct tee_context *ctx, bool cap_memref_null);
+void optee_release(struct tee_context *ctx);
+void optee_release_supp(struct tee_context *ctx);
+
+static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr,
+					      const struct optee_msg_param *mp)
+{
+	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;
+}
+
+static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
+					    const struct tee_param *p)
+{
+	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;
+}
+
+void optee_cq_wait_init(struct optee_call_queue *cq,
+			struct optee_call_waiter *w);
+void optee_cq_wait_for_completion(struct optee_call_queue *cq,
+				  struct optee_call_waiter *w);
+void optee_cq_wait_final(struct optee_call_queue *cq,
+			 struct optee_call_waiter *w);
+int optee_check_mem_type(unsigned long start, size_t num_pages);
+struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
+				  struct optee_msg_arg **msg_arg);
+
+struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
+void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);
+void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
+		   struct optee_msg_arg *arg);
 
 /*
  * Small helpers
···
 	*reg0 = val >> 32;
 	*reg1 = val;
 }
+
+/* Registration of the ABIs */
+int optee_smc_abi_register(void);
+void optee_smc_abi_unregister(void);
+int optee_ffa_abi_register(void);
+void optee_ffa_abi_unregister(void);
 
 #endif /*OPTEE_PRIVATE_H*/

drivers/tee/optee/rpc.c

···
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015-2016, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/delay.h>
-#include <linux/device.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/tee_drv.h>
 #include "optee_private.h"
-#include "optee_smc.h"
 #include "optee_rpc_cmd.h"
 
 struct wq_entry {
···
 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
 					     struct optee_msg_arg *arg)
 {
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct tee_param *params;
 	struct i2c_adapter *adapter;
 	struct i2c_msg msg = { };
···
 		return;
 	}
 
-	if (optee_from_msg_param(params, arg->num_params, arg->params))
+	if (optee->ops->from_msg_param(optee, params, arg->num_params,
+				       arg->params))
 		goto bad;
 
 	for (i = 0; i < arg->num_params; i++) {
···
 		arg->ret = TEEC_ERROR_COMMUNICATION;
 	} else {
 		params[3].u.value.a = msg.len;
-		if (optee_to_msg_param(arg->params, arg->num_params, params))
+		if (optee->ops->to_msg_param(optee, arg->params,
+					     arg->num_params, params))
 			arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 		else
 			arg->ret = TEEC_SUCCESS;
···
 	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 }
 
-static void handle_rpc_supp_cmd(struct tee_context *ctx,
+static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
 				struct optee_msg_arg *arg)
 {
 	struct tee_param *params;
···
 		return;
 	}
 
-	if (optee_from_msg_param(params, arg->num_params, arg->params)) {
+	if (optee->ops->from_msg_param(optee, params, arg->num_params,
+				       arg->params)) {
 		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 		goto out;
 	}
 
 	arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
 
-	if (optee_to_msg_param(arg->params, arg->num_params, params))
+	if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
+				     params))
 		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 out:
 	kfree(params);
 }
 
-static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
+struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
 {
 	u32 ret;
 	struct tee_param param;
···
 	return shm;
 }
 
-static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
-					  struct optee_msg_arg *arg,
-					  struct optee_call_ctx *call_ctx)
-{
-	phys_addr_t pa;
-	struct tee_shm *shm;
-	size_t sz;
-	size_t n;
-
-	arg->ret_origin = TEEC_ORIGIN_COMMS;
-
-	if (!arg->num_params ||
-	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
-		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-		return;
-	}
-
-	for (n = 1; n < arg->num_params; n++) {
-		if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
-			arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-			return;
-		}
-	}
-
-	sz = arg->params[0].u.value.b;
-	switch (arg->params[0].u.value.a) {
-	case OPTEE_RPC_SHM_TYPE_APPL:
-		shm = cmd_alloc_suppl(ctx, sz);
-		break;
-	case OPTEE_RPC_SHM_TYPE_KERNEL:
-		shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
-		break;
-	default:
-		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-		return;
-	}
-
-	if (IS_ERR(shm)) {
-		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
-		return;
-	}
-
-	if (tee_shm_get_pa(shm, 0, &pa)) {
-		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-		goto bad;
-	}
-
-	sz = tee_shm_get_size(shm);
-
-	if (tee_shm_is_registered(shm)) {
-		struct page **pages;
-		u64 *pages_list;
-		size_t page_num;
-
-		pages = tee_shm_get_pages(shm, &page_num);
-		if (!pages || !page_num) {
-			arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
-			goto bad;
-		}
-
-		pages_list = optee_allocate_pages_list(page_num);
-		if (!pages_list) {
-			arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
-			goto bad;
-		}
-
-		call_ctx->pages_list = pages_list;
-		call_ctx->num_entries = page_num;
-
-		arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
-				      OPTEE_MSG_ATTR_NONCONTIG;
-		/*
-		 * In the least bits of u.tmem.buf_ptr we store buffer offset
-		 * from 4k page, as described in OP-TEE ABI.
-		 */
-		arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
-			(tee_shm_get_page_offset(shm) &
-			 (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
-		arg->params[0].u.tmem.size = tee_shm_get_size(shm);
-		arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
-
-		optee_fill_pages_list(pages_list, pages, page_num,
-				      tee_shm_get_page_offset(shm));
-	} else {
-		arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
-		arg->params[0].u.tmem.buf_ptr = pa;
-		arg->params[0].u.tmem.size = sz;
-		arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
-	}
-
-	arg->ret = TEEC_SUCCESS;
-	return;
-bad:
-	tee_shm_free(shm);
-}
-
-static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
+void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
 {
 	struct tee_param param;
 
···
 	optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, &param);
 }
 
-static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
-					 struct optee_msg_arg *arg)
+void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
+		   struct optee_msg_arg *arg)
 {
-	struct tee_shm *shm;
-
-	arg->ret_origin = TEEC_ORIGIN_COMMS;
-
-	if (arg->num_params != 1 ||
-	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
-		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-		return;
-	}
-
-	shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
-	switch (arg->params[0].u.value.a) {
-	case OPTEE_RPC_SHM_TYPE_APPL:
-		cmd_free_suppl(ctx, shm);
-		break;
-	case OPTEE_RPC_SHM_TYPE_KERNEL:
-		tee_shm_free(shm);
-		break;
-	default:
-		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
-	}
-	arg->ret = TEEC_SUCCESS;
-}
-
-static void free_pages_list(struct optee_call_ctx *call_ctx)
-{
-	if (call_ctx->pages_list) {
-		optee_free_pages_list(call_ctx->pages_list,
-				      call_ctx->num_entries);
-		call_ctx->pages_list = NULL;
-		call_ctx->num_entries = 0;
-	}
-}
-
-void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx)
-{
-	free_pages_list(call_ctx);
-}
-
-static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
-				struct tee_shm *shm,
-				struct optee_call_ctx *call_ctx)
-{
-	struct optee_msg_arg *arg;
-
-	arg = tee_shm_get_va(shm, 0);
-	if (IS_ERR(arg)) {
-		pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
-		return;
-	}
-
 	switch (arg->cmd) {
 	case OPTEE_RPC_CMD_GET_TIME:
 		handle_rpc_func_cmd_get_time(arg);
···
 	case OPTEE_RPC_CMD_SUSPEND:
 		handle_rpc_func_cmd_wait(arg);
 		break;
-	case OPTEE_RPC_CMD_SHM_ALLOC:
-		free_pages_list(call_ctx);
-		handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
-		break;
-	case OPTEE_RPC_CMD_SHM_FREE:
-		handle_rpc_func_cmd_shm_free(ctx, arg);
-		break;
 	case OPTEE_RPC_CMD_I2C_TRANSFER:
 		handle_rpc_func_cmd_i2c_transfer(ctx, arg);
 		break;
 	default:
-		handle_rpc_supp_cmd(ctx, arg);
+		handle_rpc_supp_cmd(ctx, optee, arg);
 	}
 }
 
-/**
- * optee_handle_rpc() - handle RPC from secure world
- * @ctx:	context doing the RPC
- * @param:	value of registers for the RPC
- * @call_ctx:	call context. Preserved during one OP-TEE invocation
- *
- * Result of RPC is written back into @param.
- */
-void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
-		      struct optee_call_ctx *call_ctx)
-{
-	struct tee_device *teedev = ctx->teedev;
-	struct optee *optee = tee_get_drvdata(teedev);
-	struct tee_shm *shm;
-	phys_addr_t pa;
 
-	switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
-	case OPTEE_SMC_RPC_FUNC_ALLOC:
-		shm = tee_shm_alloc(ctx, param->a1,
-				    TEE_SHM_MAPPED | TEE_SHM_PRIV);
-		if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
-			reg_pair_from_64(&param->a1, &param->a2, pa);
-			reg_pair_from_64(&param->a4, &param->a5,
-					 (unsigned long)shm);
-		} else {
-			param->a1 = 0;
-			param->a2 = 0;
-			param->a4 = 0;
-			param->a5 = 0;
-		}
-		break;
-	case OPTEE_SMC_RPC_FUNC_FREE:
-		shm = reg_pair_to_ptr(param->a1, param->a2);
-		tee_shm_free(shm);
-		break;
-	case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
-		/*
-		 * A foreign interrupt was raised while secure world was
-		 * executing, since they are handled in Linux a dummy RPC is
-		 * performed to let Linux take the interrupt through the normal
-		 * vector.
-		 */
-		break;
-	case OPTEE_SMC_RPC_FUNC_CMD:
-		shm = reg_pair_to_ptr(param->a1, param->a2);
-		handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
-		break;
-	default:
-		pr_warn("Unknown RPC func 0x%x\n",
-			(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
-		break;
-	}
-
-	param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
-}

drivers/tee/optee/shm_pool.c

···
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2015, Linaro Limited
- * Copyright (c) 2017, EPAM Systems
- */
-#include <linux/device.h>
-#include <linux/dma-buf.h>
-#include <linux/genalloc.h>
-#include <linux/slab.h>
-#include <linux/tee_drv.h>
-#include "optee_private.h"
-#include "optee_smc.h"
-#include "shm_pool.h"
-
-static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
-			 struct tee_shm *shm, size_t size)
-{
-	unsigned int order = get_order(size);
-	struct page *page;
-	int rc = 0;
-
-	page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
-	if (!page)
-		return -ENOMEM;
-
-	shm->kaddr = page_address(page);
-	shm->paddr = page_to_phys(page);
-	shm->size = PAGE_SIZE << order;
-
-	/*
-	 * Shared memory private to the OP-TEE driver doesn't need
-	 * to be registered with OP-TEE.
-	 */
-	if (!(shm->flags & TEE_SHM_PRIV)) {
-		unsigned int nr_pages = 1 << order, i;
-		struct page **pages;
-
-		pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
-		if (!pages) {
-			rc = -ENOMEM;
-			goto err;
-		}
-
-		for (i = 0; i < nr_pages; i++) {
-			pages[i] = page;
-			page++;
-		}
-
-		shm->flags |= TEE_SHM_REGISTER;
-		rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
-					(unsigned long)shm->kaddr);
-		kfree(pages);
-		if (rc)
-			goto err;
-	}
-
-	return 0;
-
-err:
-	__free_pages(page, order);
-	return rc;
-}
-
-static void pool_op_free(struct tee_shm_pool_mgr *poolm,
-			 struct tee_shm *shm)
-{
-	if (!(shm->flags & TEE_SHM_PRIV))
-		optee_shm_unregister(shm->ctx, shm);
-
-	free_pages((unsigned long)shm->kaddr, get_order(shm->size));
-	shm->kaddr = NULL;
-}
-
-static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
-{
-	kfree(poolm);
-}
-
-static const struct tee_shm_pool_mgr_ops pool_ops = {
-	.alloc = pool_op_alloc,
-	.free = pool_op_free,
-	.destroy_poolmgr = pool_op_destroy_poolmgr,
-};
-
-/**
- * optee_shm_pool_alloc_pages() - create page-based allocator pool
- *
- * This pool is used when OP-TEE supports dymanic SHM. In this case
- * command buffers and such are allocated from kernel's own memory.
- */
-struct tee_shm_pool_mgr *optee_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_ops;
-
-	return mgr;
-}

drivers/tee/optee/shm_pool.h

···
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (c) 2015, Linaro Limited
- * Copyright (c) 2016, EPAM Systems
- */
-
-#ifndef SHM_POOL_H
-#define SHM_POOL_H
-
-#include <linux/tee_drv.h>
-
-struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void);
-
-#endif

drivers/tee/optee/smc_abi.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015-2021, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/arm-smccc.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/sched.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/workqueue.h>
+#include "optee_private.h"
+#include "optee_smc.h"
+#include "optee_rpc_cmd.h"
+#define CREATE_TRACE_POINTS
+#include "optee_trace.h"
+
+/*
+ * This file implement the SMC ABI used when communicating with secure world
+ * OP-TEE OS via raw SMCs.
+ * This file is divided into the following sections:
+ * 1. Convert between struct tee_param and struct optee_msg_param
+ * 2. Low level support functions to register shared memory in secure world
+ * 3. Dynamic shared memory pool based on alloc_pages()
+ * 4. Do a normal scheduled call into secure world
+ * 5. Driver initialization.
+ */
+
+#define OPTEE_SHM_NUM_PRIV_PAGES	CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
+
+/*
+ * 1. Convert between struct tee_param and struct optee_msg_param
+ *
+ * optee_from_msg_param() and optee_to_msg_param() are the main
+ * functions.
+ */
+
+static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
+				  const struct optee_msg_param *mp)
+{
+	struct tee_shm *shm;
+	phys_addr_t pa;
+	int rc;
+
+	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;
+		return 0;
+	}
+
+	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;
+	}
+
+	return 0;
+}
+
+static void from_msg_param_reg_mem(struct tee_param *p, u32 attr,
+				   const struct optee_msg_param *mp)
+{
+	struct tee_shm *shm;
+
+	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 = mp->u.rmem.offs;
+		p->u.memref.shm = shm;
+	} else {
+		p->u.memref.shm_offs = 0;
+		p->u.memref.shm = NULL;
+	}
+}
+
+/**
+ * optee_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_from_msg_param(struct optee *optee, struct tee_param *params,
+				size_t num_params,
+				const struct optee_msg_param *msg_params)
+{
+	int rc;
+	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_TMEM_INPUT:
+		case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
+		case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
+			rc = from_msg_param_tmp_mem(p, attr, mp);
+			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:
+			from_msg_param_reg_mem(p, attr, mp);
+			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
+ * @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_to_msg_param(struct optee *optee,
+			      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:
+			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 (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;
+}
+
+/*
+ * 2. Low level support functions to register shared memory in secure world
+ *
+ * Functions to enable/disable shared memory caching in secure world, that
+ * is, lazy freeing of previously allocated shared memory. Freeing is
+ * performed when a request has been compled.
+ *
+ * Functions to register and unregister shared memory both for normal
+ * clients and for tee-supplicant.
+ */
+
+/**
+ * optee_enable_shm_cache() - Enables caching of some shared memory allocation
+ *			      in OP-TEE
+ * @optee:	main service struct
+ */
+static void optee_enable_shm_cache(struct optee *optee)
+{
+	struct optee_call_waiter w;
+
+	/* We need to retry until secure world isn't busy. */
+	optee_cq_wait_init(&optee->call_queue, &w);
+	while (true) {
+		struct arm_smccc_res res;
+
+		optee->smc.invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE,
+				     0, 0, 0, 0, 0, 0, 0, &res);
+		if (res.a0 == OPTEE_SMC_RETURN_OK)
+			break;
+		optee_cq_wait_for_completion(&optee->call_queue, &w);
+	}
+	optee_cq_wait_final(&optee->call_queue, &w);
+}
+
+/**
+ * __optee_disable_shm_cache() - Disables caching of some shared memory
+ *				 allocation in OP-TEE
+ * @optee:	main service struct
+ * @is_mapped:	true if the cached shared memory addresses were mapped by this
+ *		kernel, are safe to dereference, and should be freed
+ */
+static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
+{
+	struct optee_call_waiter w;
+
+	/* We need to retry until secure world isn't busy. */
+	optee_cq_wait_init(&optee->call_queue, &w);
+	while (true) {
+		union {
+			struct arm_smccc_res smccc;
+			struct optee_smc_disable_shm_cache_result result;
+		} res;
+
+		optee->smc.invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE,
+				     0, 0, 0, 0, 0, 0, 0, &res.smccc);
+		if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
+			break; /* All shm's freed */
+		if (res.result.status == OPTEE_SMC_RETURN_OK) {
+			struct tee_shm *shm;
+
+			/*
+			 * Shared memory references that were not mapped by
+			 * this kernel must be ignored to prevent a crash.
+			 */
+			if (!is_mapped)
+				continue;
+
+			shm = reg_pair_to_ptr(res.result.shm_upper32,
+					      res.result.shm_lower32);
+			tee_shm_free(shm);
+		} else {
+			optee_cq_wait_for_completion(&optee->call_queue, &w);
+		}
+	}
+	optee_cq_wait_final(&optee->call_queue, &w);
+}
+
+/**
+ * optee_disable_shm_cache() - Disables caching of mapped shared memory
+ *			       allocations in OP-TEE
+ * @optee:	main service struct
+ */
+static void optee_disable_shm_cache(struct optee *optee)
+{
+	return __optee_disable_shm_cache(optee, true);
+}
+
+/**
+ * optee_disable_unmapped_shm_cache() - Disables caching of shared memory
+ *					allocations in OP-TEE which are not
+ *					currently mapped
+ * @optee:	main service struct
+ */
+static void optee_disable_unmapped_shm_cache(struct optee *optee)
+{
+	return __optee_disable_shm_cache(optee, false);
+}
+
+#define PAGELIST_ENTRIES_PER_PAGE				\
+	((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
+
+/*
+ * The final entry in each pagelist page is a pointer to the next
+ * pagelist page.
+ */
+static size_t get_pages_list_size(size_t num_entries)
+{
+	int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
+
+	return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
+}
+
+static u64 *optee_allocate_pages_list(size_t num_entries)
+{
+	return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
+}
+
+static void optee_free_pages_list(void *list, size_t num_entries)
+{
+	free_pages_exact(list, get_pages_list_size(num_entries));
+}
+
+/**
+ * optee_fill_pages_list() - write list of user pages to given shared
+ * buffer.
+ *
+ * @dst: page-aligned buffer where list of pages will be stored
+ * @pages: array of pages that represents shared buffer
+ * @num_pages: number of entries in @pages
+ * @page_offset: offset of user buffer from page start
+ *
+ * @dst should be big enough to hold list of user page addresses and
+ *	links to the next pages of buffer
+ */
+static void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
+				  size_t page_offset)
+{
+	int n = 0;
+	phys_addr_t optee_page;
+	/*
+	 * Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
+	 * for details.
+	 */
+	struct {
+		u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
+		u64 next_page_data;
+	} *pages_data;
+
+	/*
+	 * Currently OP-TEE uses 4k page size and it does not looks
+	 * like this will change in the future.  On other hand, there are
+	 * no know ARM architectures with page size < 4k.
+	 * Thus the next built assert looks redundant. But the following
+	 * code heavily relies on this assumption, so it is better be
+	 * safe than sorry.
+	 */
+	BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
+
+	pages_data = (void *)dst;
+	/*
+	 * If linux page is bigger than 4k, and user buffer offset is
+	 * larger than 4k/8k/12k/etc this will skip first 4k pages,
+	 * because they bear no value data for OP-TEE.
+	 */
+	optee_page = page_to_phys(*pages) +
+		round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
+
+	while (true) {
+		pages_data->pages_list[n++] = optee_page;
+
+		if (n == PAGELIST_ENTRIES_PER_PAGE) {
+			pages_data->next_page_data =
+				virt_to_phys(pages_data + 1);
+			pages_data++;
+			n = 0;
+		}
+
+		optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
+		if (!(optee_page & ~PAGE_MASK)) {
+			if (!--num_pages)
+				break;
+			pages++;
+			optee_page = page_to_phys(*pages);
+		}
+	}
+}
+
+static int optee_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);
+	struct optee_msg_arg *msg_arg;
+	struct tee_shm *shm_arg;
+	u64 *pages_list;
+	int rc;
+
+	if (!num_pages)
+		return -EINVAL;
+
+	rc = optee_check_mem_type(start, num_pages);
+	if (rc)
+		return rc;
+
+	pages_list = optee_allocate_pages_list(num_pages);
+	if (!pages_list)
+		return -ENOMEM;
+
+	shm_arg = optee_get_msg_arg(ctx, 1, &msg_arg);
+	if (IS_ERR(shm_arg)) {
+		rc = PTR_ERR(shm_arg);
+		goto out;
+	}
+
+	optee_fill_pages_list(pages_list, pages, num_pages,
+			      tee_shm_get_page_offset(shm));
+
+	msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
+	msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
+				OPTEE_MSG_ATTR_NONCONTIG;
+	msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
+	msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
+	/*
+	 * In the least bits of msg_arg->params->u.tmem.buf_ptr we
+	 * store buffer offset from 4k page, as described in OP-TEE ABI.
+	 */
+	msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
+	  (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
+
+	if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
+	    msg_arg->ret != TEEC_SUCCESS)
+		rc = -EINVAL;
+
+	tee_shm_free(shm_arg);
+out:
+	optee_free_pages_list(pages_list, num_pages);
+	return rc;
+}
+
+static int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	struct optee_msg_arg *msg_arg;
+	struct tee_shm *shm_arg;
+	int rc = 0;
+
+	shm_arg = optee_get_msg_arg(ctx, 1, &msg_arg);
+	if (IS_ERR(shm_arg))
+		return PTR_ERR(shm_arg);
+
+	msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
+
+	msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
+	msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
+
+	if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
+	    msg_arg->ret != TEEC_SUCCESS)
+		rc = -EINVAL;
+	tee_shm_free(shm_arg);
+	return rc;
+}
+
+static int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
+				   struct page **pages, size_t num_pages,
+				   unsigned long start)
+{
+	/*
+	 * We don't want to register supplicant memory in OP-TEE.
+	 * Instead information about it will be passed in RPC code.
+	 */
+	return optee_check_mem_type(start, num_pages);
+}
+
+static int optee_shm_unregister_supp(struct tee_context *ctx,
+				     struct tee_shm *shm)
+{
+	return 0;
+}
+
+/*
+ * 3. Dynamic shared memory pool based on alloc_pages()
+ *
+ * Implements an OP-TEE specific shared memory pool which is used
+ * when dynamic shared memory is supported by secure world.
+ *
+ * The main function is optee_shm_pool_alloc_pages().
+ */
+
+static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
+			 struct tee_shm *shm, size_t size)
+{
+	/*
+	 * Shared memory private to the OP-TEE driver doesn't need
+	 * to be registered with OP-TEE.
+	 */
+	if (shm->flags & TEE_SHM_PRIV)
+		return optee_pool_op_alloc_helper(poolm, shm, size, NULL);
+
+	return optee_pool_op_alloc_helper(poolm, shm, size, optee_shm_register);
+}
+
+static void pool_op_free(struct tee_shm_pool_mgr *poolm,
+			 struct tee_shm *shm)
+{
+	if (!(shm->flags & TEE_SHM_PRIV))
+		optee_shm_unregister(shm->ctx, shm);
+
+	free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+	shm->kaddr = NULL;
+}
+
+static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
+{
+	kfree(poolm);
+}
+
+static const struct tee_shm_pool_mgr_ops pool_ops = {
+	.alloc = pool_op_alloc,
+	.free = pool_op_free,
+	.destroy_poolmgr = pool_op_destroy_poolmgr,
+};
+
+/**
+ * optee_shm_pool_alloc_pages() - create page-based allocator pool
+ *
+ * This pool is used when OP-TEE supports dymanic SHM. In this case
+ * command buffers and such are allocated from kernel's own memory.
+ */
+static struct tee_shm_pool_mgr *optee_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_ops;
+
+	return mgr;
+}
+
+/*
+ * 4. Do a normal scheduled call into secure world
+ *
+ * The function optee_smc_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_rpc_func_cmd_shm_free(struct tee_context *ctx,
+					 struct optee_msg_arg *arg)
+{
+	struct tee_shm *shm;
+
+	arg->ret_origin = TEEC_ORIGIN_COMMS;
+
+	if (arg->num_params != 1 ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
+	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:
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+	}
+	arg->ret = TEEC_SUCCESS;
+}
+
+static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
+					  struct optee_msg_arg *arg,
+					  struct optee_call_ctx *call_ctx)
+{
+	phys_addr_t pa;
+	struct tee_shm *shm;
+	size_t sz;
+	size_t n;
+
+	arg->ret_origin = TEEC_ORIGIN_COMMS;
+
+	if (!arg->num_params ||
+	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	for (n = 1; n < arg->num_params; n++) {
+		if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
+			arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+			return;
+		}
+	}
+
+	sz = arg->params[0].u.value.b;
+	switch (arg->params[0].u.value.a) {
+	case OPTEE_RPC_SHM_TYPE_APPL:
+		shm = optee_rpc_cmd_alloc_suppl(ctx, sz);
+		break;
+	case OPTEE_RPC_SHM_TYPE_KERNEL:
+		shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
+		break;
+	default:
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		return;
+	}
+
+	if (IS_ERR(shm)) {
+		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+		return;
+	}
+
+	if (tee_shm_get_pa(shm, 0, &pa)) {
+		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
+		goto bad;
+	}
+
+	sz = tee_shm_get_size(shm);
+
+	if (tee_shm_is_registered(shm)) {
+		struct page **pages;
+		u64 *pages_list;
+		size_t page_num;
+
+		pages = tee_shm_get_pages(shm, &page_num);
+		if (!pages || !page_num) {
+			arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+			goto bad;
+		}
+
+		pages_list = optee_allocate_pages_list(page_num);
+		if (!pages_list) {
+			arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
+			goto bad;
+		}
+
+		call_ctx->pages_list = pages_list;
+		call_ctx->num_entries = page_num;
+
+		arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
+				      OPTEE_MSG_ATTR_NONCONTIG;
+		/*
+		 * In the least bits of u.tmem.buf_ptr we store buffer offset
+		 * from 4k page, as described in OP-TEE ABI.
+		 */
+		arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
+			(tee_shm_get_page_offset(shm) &
+			 (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
+		arg->params[0].u.tmem.size = tee_shm_get_size(shm);
+		arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
+
+		optee_fill_pages_list(pages_list, pages, page_num,
+				      tee_shm_get_page_offset(shm));
+	} else {
+		arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
+		arg->params[0].u.tmem.buf_ptr = pa;
+		arg->params[0].u.tmem.size = sz;
+		arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
+	}
+
+	arg->ret = TEEC_SUCCESS;
+	return;
+bad:
+	tee_shm_free(shm);
+}
+
+static void free_pages_list(struct optee_call_ctx *call_ctx)
+{
+	if (call_ctx->pages_list) {
+		optee_free_pages_list(call_ctx->pages_list,
+				      call_ctx->num_entries);
+		call_ctx->pages_list = NULL;
+		call_ctx->num_entries = 0;
+	}
+}
+
+static void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx)
+{
+	free_pages_list(call_ctx);
+}
+
+static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
+				struct tee_shm *shm,
+				struct optee_call_ctx *call_ctx)
+{
+	struct optee_msg_arg *arg;
+
+	arg = tee_shm_get_va(shm, 0);
+	if (IS_ERR(arg)) {
+		pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
+		return;
+	}
+
+	switch (arg->cmd) {
+	case OPTEE_RPC_CMD_SHM_ALLOC:
+		free_pages_list(call_ctx);
+		handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
+		break;
+	case OPTEE_RPC_CMD_SHM_FREE:
+		handle_rpc_func_cmd_shm_free(ctx, arg);
+		break;
+	default:
+		optee_rpc_cmd(ctx, optee, arg);
+	}
+}
+
+/**
+ * optee_handle_rpc() - handle RPC from secure world
+ * @ctx:	context doing the RPC
+ * @param:	value of registers for the RPC
+ * @call_ctx:	call context. Preserved during one OP-TEE invocation
+ *
+ * Result of RPC is written back into @param.
+ */
+static void optee_handle_rpc(struct tee_context *ctx,
+			     struct optee_rpc_param *param,
+			     struct optee_call_ctx *call_ctx)
+{
+	struct tee_device *teedev = ctx->teedev;
+	struct optee *optee = tee_get_drvdata(teedev);
+	struct tee_shm *shm;
+	phys_addr_t pa;
+
+	switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
+	case OPTEE_SMC_RPC_FUNC_ALLOC:
+		shm = tee_shm_alloc(ctx, param->a1,
+				    TEE_SHM_MAPPED | TEE_SHM_PRIV);
+		if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
+			reg_pair_from_64(&param->a1, &param->a2, pa);
+			reg_pair_from_64(&param->a4, &param->a5,
+					 (unsigned long)shm);
+		} else {
+			param->a1 = 0;
+			param->a2 = 0;
+			param->a4 = 0;
+			param->a5 = 0;
+		}
+		break;
+	case OPTEE_SMC_RPC_FUNC_FREE:
+		shm = reg_pair_to_ptr(param->a1, param->a2);
+		tee_shm_free(shm);
+		break;
+	case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
+		/*
+		 * A foreign interrupt was raised while secure world was
+		 * executing, since they are handled in Linux a dummy RPC is
+		 * performed to let Linux take the interrupt through the normal
+		 * vector.
+		 */
+		break;
+	case OPTEE_SMC_RPC_FUNC_CMD:
+		shm = reg_pair_to_ptr(param->a1, param->a2);
+		handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
+		break;
+	default:
+		pr_warn("Unknown RPC func 0x%x\n",
+			(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
+		break;
+	}
+
+	param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
+}
+
+/**
+ * optee_smc_do_call_with_arg() - Do an SMC to OP-TEE in secure world
+ * @ctx:	calling context
+ * @arg:	shared memory holding the message to pass to secure world
+ *
+ * Does and SMC to OP-TEE in secure world and handles eventual resulting
+ * Remote Procedure Calls (RPC) from OP-TEE.
+ *
+ * Returns return code from secure world, 0 is OK
+ */
+static int optee_smc_do_call_with_arg(struct tee_context *ctx,
+				      struct tee_shm *arg)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	struct optee_call_waiter w;
+	struct optee_rpc_param param = { };
+	struct optee_call_ctx call_ctx = { };
+	phys_addr_t parg;
+	int rc;
+
+	rc = tee_shm_get_pa(arg, 0, &parg);
+	if (rc)
+		return rc;
+
+	param.a0 = OPTEE_SMC_CALL_WITH_ARG;
+	reg_pair_from_64(&param.a1, &param.a2, parg);
+	/* Initialize waiter */
+	optee_cq_wait_init(&optee->call_queue, &w);
+	while (true) {
+		struct arm_smccc_res res;
+
+		trace_optee_invoke_fn_begin(&param);
+		optee->smc.invoke_fn(param.a0, param.a1, param.a2, param.a3,
+				     param.a4, param.a5, param.a6, param.a7,
+				     &res);
+		trace_optee_invoke_fn_end(&param, &res);
+
+		if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
+			/*
+			 * Out of threads in secure world, wait for a thread
+			 * become available.
+			 */
+			optee_cq_wait_for_completion(&optee->call_queue, &w);
+		} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
+			cond_resched();
+			param.a0 = res.a0;
+			param.a1 = res.a1;
+			param.a2 = res.a2;
+			param.a3 = res.a3;
+			optee_handle_rpc(ctx, &param, &call_ctx);
+		} else {
+			rc = res.a0;
+			break;
+		}
+	}
+
+	optee_rpc_finalize_call(&call_ctx);
+	/*
+	 * 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;
+}
+
+/*
+ * 5. Driver initialization
+ *
+ * During driver inititialization is secure world probed to find out which
+ * features it supports so the driver can be initialized with a matching
+ * configuration. This involves for instance support for dynamic shared
+ * memory instead of a static memory carvout.
+ */
+
+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->smc.sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
+		v.gen_caps |= TEE_GEN_CAP_REG_MEM;
+	if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
+		v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
+	*vers = v;
+}
+
+static int optee_smc_open(struct tee_context *ctx)
+{
+	struct optee *optee = tee_get_drvdata(ctx->teedev);
+	u32 sec_caps = optee->smc.sec_caps;
+
+	return optee_open(ctx, sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL);
+}
+
+static const struct tee_driver_ops optee_clnt_ops = {
+	.get_version = optee_get_version,
+	.open = optee_smc_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_clnt_desc = {
+	.name = DRIVER_NAME "-clnt",
+	.ops = &optee_clnt_ops,
+	.owner = THIS_MODULE,
+};
+
+static const struct tee_driver_ops optee_supp_ops = {
+	.get_version = optee_get_version,
+	.open = optee_smc_open,
+	.release = optee_release_supp,
+	.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 const struct optee_ops optee_ops = {
+	.do_call_with_arg = optee_smc_do_call_with_arg,
+	.to_msg_param = optee_to_msg_param,
+	.from_msg_param = optee_from_msg_param,
+};
+
+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 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);
+}
+
+/* optee_remove - Device Removal Routine
+ * @pdev: platform device information struct
+ *
+ * optee_remove is called by platform subsystem to alert the driver
+ * that it should release the device
+ */
+static int optee_smc_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);
+
+	optee_remove_common(optee);
+
+	if (optee->smc.memremaped_shm)
+		memunmap(optee->smc.memremaped_shm);
+
+	kfree(optee);
+
+	return 0;
+}
+
+/* optee_shutdown - Device Removal Routine
+ * @pdev: platform device information struct
+ *
+ * platform_shutdown is called by the platform subsystem to alert
+ * the driver that a shutdown, reboot, or kexec is happening and
+ * device must be disabled.
+ */
+static void optee_shutdown(struct platform_device *pdev)
+{
+	optee_disable_shm_cache(platform_get_drvdata(pdev));
+}
+
+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->ops = &optee_ops;
+	optee->smc.invoke_fn = invoke_fn;
+	optee->smc.sec_caps = sec_caps;
+
+	teedev = tee_device_alloc(&optee_clnt_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->smc.memremaped_shm = memremaped_shm;
+	optee->pool = pool;
+
+	/*
+	 * Ensure that there are no pre-existing shm objects before enabling
+	 * the shm cache so that there's no chance of receiving an invalid
+	 * address during shutdown. This could occur, for example, if we're
+	 * kexec booting from an older kernel that did not properly cleanup the
+	 * shm cache.
+	 */
+	optee_disable_unmapped_shm_cache(optee);
+
+	optee_enable_shm_cache(optee);
+
+	if (optee->smc.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(PTA_CMD_GET_DEVICES);
+	if (rc) {
+		optee_smc_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_smc_remove,
+	.shutdown = optee_shutdown,
+	.driver = {
+		.name = "optee",
+		.of_match_table = optee_dt_match,
+	},
+};
+
+int optee_smc_abi_register(void)
+{
+	return platform_driver_register(&optee_driver);
+}
+
+void optee_smc_abi_unregister(void)
+{
+	platform_driver_unregister(&optee_driver);
+}

include/linux/tee_drv.h

···
  * @num_pages:	number of locked pages
  * @dmabuf:	dmabuf used to for exporting to user space
  * @flags:	defined by TEE_SHM_* in tee_drv.h
- * @id:		unique id of a shared memory object on this device
+ * @id:		unique id of a shared memory object on this device, shared
+ *		with user space
+ * @sec_world_id:
+ *		secure world assigned id of this shared memory object, not
+ *		used by all drivers
  *
  * This pool is only supposed to be accessed directly from the TEE
  * subsystem and from drivers that implements their own shm pool manager.
···
 	struct dma_buf *dmabuf;
 	u32 flags;
 	int id;
+	u64 sec_world_id;
 };
 
 /**