optee: add FF-A support (4615e5a3) · Commits · EulixOS / Software / Kernel

drivers/tee/optee/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@ optee-objs += rpc.o
		optee-objs += supp.o
		optee-objs += device.o
		optee-objs += smc_abi.o
		optee-objs += ffa_abi.o

		# for tracing framework to find optee_trace.h
		CFLAGS_smc_abi.o := -I$(src)

drivers/tee/optee/call.c

+11 −2

Original line number	Diff line number	Diff line
		@@ -107,11 +107,20 @@ static struct optee_session find_session(struct optee_context_data ctxdata,
		struct tee_shm optee_get_msg_arg(struct tee_context ctx, size_t num_params,
		struct optee_msg_arg **msg_arg)
		{
		struct optee *optee = tee_get_drvdata(ctx->teedev);
		size_t sz = OPTEE_MSG_GET_ARG_SIZE(num_params);
		struct tee_shm *shm;
		struct optee_msg_arg *ma;

		shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params),
		TEE_SHM_MAPPED \| 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;

drivers/tee/optee/core.c

+14 −2

Original line number	Diff line number	Diff line
		@@ -172,6 +172,9 @@ void optee_remove_common(struct optee *optee)
		mutex_destroy(&optee->call_queue.mutex);
		}

		static int smc_abi_rc;
		static int ffa_abi_rc;

		static int optee_core_init(void)
		{
		/*
		@@ -184,13 +187,22 @@ static int optee_core_init(void)
		if (is_kdump_kernel())
		return -ENODEV;

		return optee_smc_abi_register();
		smc_abi_rc = optee_smc_abi_register();
		ffa_abi_rc = optee_ffa_abi_register();

		/* If both failed there's no point with this module */
		if (smc_abi_rc && ffa_abi_rc)
		return smc_abi_rc;
		return 0;
		}
		module_init(optee_core_init);

		static void optee_core_exit(void)
		{
		if (!smc_abi_rc)
		optee_smc_abi_unregister();
		if (!ffa_abi_rc)
		optee_ffa_abi_unregister();
		}
		module_exit(optee_core_exit);

drivers/tee/optee/ffa_abi.c

0 → 100644

+911 −0

Original line number	Diff line number	Diff line
		// 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

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+153 −0

File added.

Preview size limit exceeded, changes collapsed.