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tee: tstee: Add Trusted Services TEE driver

Browse Source 
The Trusted Services project provides a framework for developing and
deploying device Root of Trust services in FF-A Secure Partitions. The
FF-A SPs are accessible through the FF-A driver, but this doesn't
provide a user space interface. The goal of this TEE driver is to make
Trusted Services SPs accessible for user space clients.

All TS SPs have the same FF-A UUID, it identifies the RPC protocol used
by TS. A TS SP can host one or more services, a service is identified by
its service UUID. The same type of service cannot be present twice in
the same SP. During SP boot each service in an SP is assigned an
interface ID, this is just a short ID to simplify message addressing.
There is 1:1 mapping between TS SPs and TEE devices, i.e. a separate TEE
device is registered for each TS SP. This is required since contrary to
the generic TEE design where memory is shared with the whole TEE
implementation, in case of FF-A, memory is shared with a specific SP. A
user space client has to be able to separately share memory with each SP
based on its endpoint ID.

Acked-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Balint Dobszay 2024-03-25 16:11:03 +01:00 committed by Jens Wiklander
parent cf4441503e
commit c835e5a315
7 changed files with 589 additions and 0 deletions
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1
drivers/tee/Kconfig
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@ -15,5 +15,6 @@ if TEE
source "drivers/tee/optee/Kconfig"
source "drivers/tee/amdtee/Kconfig"
source "drivers/tee/tstee/Kconfig"
endif

1
drivers/tee/Makefile
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@ -5,3 +5,4 @@ tee-objs += tee_shm.o
tee-objs += tee_shm_pool.o
obj-$(CONFIG_OPTEE) += optee/
obj-$(CONFIG_AMDTEE) += amdtee/
obj-$(CONFIG_ARM_TSTEE) += tstee/

11
drivers/tee/tstee/Kconfig Normal file
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@ -0,0 +1,11 @@
# SPDX-License-Identifier: GPL-2.0-only
config ARM_TSTEE
tristate "Arm Trusted Services TEE driver"
depends on ARM_FFA_TRANSPORT
default n
help
The Trusted Services project provides a framework for developing and
deploying device Root of Trust services in FF-A Secure Partitions.
This driver provides an interface to make Trusted Services Secure
Partitions accessible for user space clients, since the FF-A driver
doesn't implement a user space interface directly.

3
drivers/tee/tstee/Makefile Normal file
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@ -0,0 +1,3 @@
# SPDX-License-Identifier: GPL-2.0-only
arm-tstee-objs := core.o
obj-$(CONFIG_ARM_TSTEE) = arm-tstee.o

480
drivers/tee/tstee/core.c Normal file
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@ -0,0 +1,480 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023, Arm Limited
*/
#include <linux/arm_ffa.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/tee_core.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include <linux/xarray.h>
#include "tstee_private.h"
#define FFA_DIRECT_REQ_ARG_NUM 5
#define FFA_INVALID_MEM_HANDLE U64_MAX
static void arg_list_to_ffa_data(const u32 *args,
struct ffa_send_direct_data *data)
{
data->data0 = args[0];
data->data1 = args[1];
data->data2 = args[2];
data->data3 = args[3];
data->data4 = args[4];
}
static void arg_list_from_ffa_data(const struct ffa_send_direct_data *data,
u32 *args)
{
args[0] = lower_32_bits(data->data0);
args[1] = lower_32_bits(data->data1);
args[2] = lower_32_bits(data->data2);
args[3] = lower_32_bits(data->data3);
args[4] = lower_32_bits(data->data4);
}
static void tstee_get_version(struct tee_device *teedev,
struct tee_ioctl_version_data *vers)
{
struct tstee *tstee = tee_get_drvdata(teedev);
struct tee_ioctl_version_data v = {
.impl_id = TEE_IMPL_ID_TSTEE,
/* FF-A endpoint ID only uses the lower 16 bits */
.impl_caps = lower_16_bits(tstee->ffa_dev->vm_id),
.gen_caps = 0,
};
*vers = v;
}
static int tstee_open(struct tee_context *ctx)
{
struct ts_context_data *ctxdata;
ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
if (!ctxdata)
return -ENOMEM;
xa_init_flags(&ctxdata->sess_list, XA_FLAGS_ALLOC);
ctx->data = ctxdata;
return 0;
}
static void tstee_release(struct tee_context *ctx)
{
struct ts_context_data *ctxdata = ctx->data;
struct ts_session *sess;
unsigned long idx;
if (!ctxdata)
return;
xa_for_each(&ctxdata->sess_list, idx, sess) {
xa_erase(&ctxdata->sess_list, idx);
kfree(sess);
}
xa_destroy(&ctxdata->sess_list);
kfree(ctxdata);
ctx->data = NULL;
}
static int tstee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param __always_unused)
{
struct tstee *tstee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = tstee->ffa_dev;
struct ts_context_data *ctxdata = ctx->data;
struct ffa_send_direct_data ffa_data;
struct ts_session *sess = NULL;
u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] = {};
u32 sess_id;
int rc;
ffa_args[TS_RPC_CTRL_REG] =
TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID,
TS_RPC_OP_SERVICE_INFO);
memcpy(ffa_args + TS_RPC_SERVICE_INFO_UUID0, arg->uuid, UUID_SIZE);
arg_list_to_ffa_data(ffa_args, &ffa_data);
rc = ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data);
if (rc)
return rc;
arg_list_from_ffa_data(&ffa_data, ffa_args);
if (ffa_args[TS_RPC_SERVICE_INFO_RPC_STATUS] != TS_RPC_OK)
return -ENODEV;
if (ffa_args[TS_RPC_SERVICE_INFO_IFACE] > U8_MAX)
return -EINVAL;
sess = kzalloc(sizeof(*sess), GFP_KERNEL);
if (!sess)
return -ENOMEM;
sess->iface_id = ffa_args[TS_RPC_SERVICE_INFO_IFACE];
rc = xa_alloc(&ctxdata->sess_list, &sess_id, sess, xa_limit_32b,
GFP_KERNEL);
if (rc) {
kfree(sess);
return rc;
}
arg->session = sess_id;
arg->ret = 0;
return 0;
}
static int tstee_close_session(struct tee_context *ctx, u32 session)
{
struct ts_context_data *ctxdata = ctx->data;
struct ts_session *sess;
/* Calls xa_lock() internally */
sess = xa_erase(&ctxdata->sess_list, session);
if (!sess)
return -EINVAL;
kfree(sess);
return 0;
}
static int tstee_invoke_func(struct tee_context *ctx,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
struct tstee *tstee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = tstee->ffa_dev;
struct ts_context_data *ctxdata = ctx->data;
struct ffa_send_direct_data ffa_data;
struct tee_shm *shm = NULL;
struct ts_session *sess;
u32 req_len, ffa_args[FFA_DIRECT_REQ_ARG_NUM] = {};
int shm_id, rc;
u8 iface_id;
u64 handle;
u16 opcode;
xa_lock(&ctxdata->sess_list);
sess = xa_load(&ctxdata->sess_list, arg->session);
/*
* Do this while holding the lock to make sure that the session wasn't
* closed meanwhile
*/
if (sess)
iface_id = sess->iface_id;
xa_unlock(&ctxdata->sess_list);
if (!sess)
return -EINVAL;
opcode = lower_16_bits(arg->func);
shm_id = lower_32_bits(param[0].u.value.a);
req_len = lower_32_bits(param[0].u.value.b);
if (shm_id != 0) {
shm = tee_shm_get_from_id(ctx, shm_id);
if (IS_ERR(shm))
return PTR_ERR(shm);
if (shm->size < req_len) {
dev_err(&ffa_dev->dev,
"request doesn't fit into shared memory buffer\n");
rc = -EINVAL;
goto out;
}
handle = shm->sec_world_id;
} else {
handle = FFA_INVALID_MEM_HANDLE;
}
ffa_args[TS_RPC_CTRL_REG] = TS_RPC_CTRL_PACK_IFACE_OPCODE(iface_id,
opcode);
ffa_args[TS_RPC_SERVICE_MEM_HANDLE_LSW] = lower_32_bits(handle);
ffa_args[TS_RPC_SERVICE_MEM_HANDLE_MSW] = upper_32_bits(handle);
ffa_args[TS_RPC_SERVICE_REQ_LEN] = req_len;
ffa_args[TS_RPC_SERVICE_CLIENT_ID] = 0;
arg_list_to_ffa_data(ffa_args, &ffa_data);
rc = ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data);
if (rc)
goto out;
arg_list_from_ffa_data(&ffa_data, ffa_args);
if (ffa_args[TS_RPC_SERVICE_RPC_STATUS] != TS_RPC_OK) {
dev_err(&ffa_dev->dev, "invoke_func rpc status: %d\n",
ffa_args[TS_RPC_SERVICE_RPC_STATUS]);
rc = -EINVAL;
goto out;
}
arg->ret = ffa_args[TS_RPC_SERVICE_STATUS];
if (shm && shm->size >= ffa_args[TS_RPC_SERVICE_RESP_LEN])
param[0].u.value.a = ffa_args[TS_RPC_SERVICE_RESP_LEN];
out:
if (shm)
tee_shm_put(shm);
return rc;
}
static int tstee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start __always_unused)
{
struct tstee *tstee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = tstee->ffa_dev;
struct ffa_mem_region_attributes mem_attr = {
.receiver = tstee->ffa_dev->vm_id,
.attrs = FFA_MEM_RW,
.flag = 0,
};
struct ffa_mem_ops_args mem_args = {
.attrs = &mem_attr,
.use_txbuf = true,
.nattrs = 1,
.flags = 0,
};
struct ffa_send_direct_data ffa_data;
struct sg_table sgt;
u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] = {};
int rc;
rc = sg_alloc_table_from_pages(&sgt, pages, num_pages, 0,
num_pages * PAGE_SIZE, GFP_KERNEL);
if (rc)
return rc;
mem_args.sg = sgt.sgl;
rc = ffa_dev->ops->mem_ops->memory_share(&mem_args);
sg_free_table(&sgt);
if (rc)
return rc;
shm->sec_world_id = mem_args.g_handle;
ffa_args[TS_RPC_CTRL_REG] =
TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID,
TS_RPC_OP_RETRIEVE_MEM);
ffa_args[TS_RPC_RETRIEVE_MEM_HANDLE_LSW] =
lower_32_bits(shm->sec_world_id);
ffa_args[TS_RPC_RETRIEVE_MEM_HANDLE_MSW] =
upper_32_bits(shm->sec_world_id);
ffa_args[TS_RPC_RETRIEVE_MEM_TAG_LSW] = 0;
ffa_args[TS_RPC_RETRIEVE_MEM_TAG_MSW] = 0;
arg_list_to_ffa_data(ffa_args, &ffa_data);
rc = ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data);
if (rc) {
(void)ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id,
0);
return rc;
}
arg_list_from_ffa_data(&ffa_data, ffa_args);
if (ffa_args[TS_RPC_RETRIEVE_MEM_RPC_STATUS] != TS_RPC_OK) {
dev_err(&ffa_dev->dev, "shm_register rpc status: %d\n",
ffa_args[TS_RPC_RETRIEVE_MEM_RPC_STATUS]);
ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id, 0);
return -EINVAL;
}
return 0;
}
static int tstee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
{
struct tstee *tstee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = tstee->ffa_dev;
struct ffa_send_direct_data ffa_data;
u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] = {};
int rc;
ffa_args[TS_RPC_CTRL_REG] =
TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID,
TS_RPC_OP_RELINQ_MEM);
ffa_args[TS_RPC_RELINQ_MEM_HANDLE_LSW] =
lower_32_bits(shm->sec_world_id);
ffa_args[TS_RPC_RELINQ_MEM_HANDLE_MSW] =
upper_32_bits(shm->sec_world_id);
arg_list_to_ffa_data(ffa_args, &ffa_data);
rc = ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data);
if (rc)
return rc;
arg_list_from_ffa_data(&ffa_data, ffa_args);
if (ffa_args[TS_RPC_RELINQ_MEM_RPC_STATUS] != TS_RPC_OK) {
dev_err(&ffa_dev->dev, "shm_unregister rpc status: %d\n",
ffa_args[TS_RPC_RELINQ_MEM_RPC_STATUS]);
return -EINVAL;
}
rc = ffa_dev->ops->mem_ops->memory_reclaim(shm->sec_world_id, 0);
return rc;
}
static const struct tee_driver_ops tstee_ops = {
.get_version = tstee_get_version,
.open = tstee_open,
.release = tstee_release,
.open_session = tstee_open_session,
.close_session = tstee_close_session,
.invoke_func = tstee_invoke_func,
};
static const struct tee_desc tstee_desc = {
.name = "tstee-clnt",
.ops = &tstee_ops,
.owner = THIS_MODULE,
};
static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align)
{
return tee_dyn_shm_alloc_helper(shm, size, align, tstee_shm_register);
}
static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
{
tee_dyn_shm_free_helper(shm, tstee_shm_unregister);
}
static void pool_op_destroy_pool(struct tee_shm_pool *pool)
{
kfree(pool);
}
static const struct tee_shm_pool_ops pool_ops = {
.alloc = pool_op_alloc,
.free = pool_op_free,
.destroy_pool = pool_op_destroy_pool,
};
static struct tee_shm_pool *tstee_create_shm_pool(void)
{
struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return ERR_PTR(-ENOMEM);
pool->ops = &pool_ops;
return pool;
}
static bool tstee_check_rpc_compatible(struct ffa_device *ffa_dev)
{
struct ffa_send_direct_data ffa_data;
u32 ffa_args[FFA_DIRECT_REQ_ARG_NUM] = {};
ffa_args[TS_RPC_CTRL_REG] =
TS_RPC_CTRL_PACK_IFACE_OPCODE(TS_RPC_MGMT_IFACE_ID,
TS_RPC_OP_GET_VERSION);
arg_list_to_ffa_data(ffa_args, &ffa_data);
if (ffa_dev->ops->msg_ops->sync_send_receive(ffa_dev, &ffa_data))
return false;
arg_list_from_ffa_data(&ffa_data, ffa_args);
return ffa_args[TS_RPC_GET_VERSION_RESP] == TS_RPC_PROTOCOL_VERSION;
}
static int tstee_probe(struct ffa_device *ffa_dev)
{
struct tstee *tstee;
int rc;
ffa_dev->ops->msg_ops->mode_32bit_set(ffa_dev);
if (!tstee_check_rpc_compatible(ffa_dev))
return -EINVAL;
tstee = kzalloc(sizeof(*tstee), GFP_KERNEL);
if (!tstee)
return -ENOMEM;
tstee->ffa_dev = ffa_dev;
tstee->pool = tstee_create_shm_pool();
if (IS_ERR(tstee->pool)) {
rc = PTR_ERR(tstee->pool);
tstee->pool = NULL;
goto err_free_tstee;
}
tstee->teedev = tee_device_alloc(&tstee_desc, NULL, tstee->pool, tstee);
if (IS_ERR(tstee->teedev)) {
rc = PTR_ERR(tstee->teedev);
tstee->teedev = NULL;
goto err_free_pool;
}
rc = tee_device_register(tstee->teedev);
if (rc)
goto err_unreg_teedev;
ffa_dev_set_drvdata(ffa_dev, tstee);
return 0;
err_unreg_teedev:
tee_device_unregister(tstee->teedev);
err_free_pool:
tee_shm_pool_free(tstee->pool);
err_free_tstee:
kfree(tstee);
return rc;
}
static void tstee_remove(struct ffa_device *ffa_dev)
{
struct tstee *tstee = ffa_dev->dev.driver_data;
tee_device_unregister(tstee->teedev);
tee_shm_pool_free(tstee->pool);
kfree(tstee);
}
static const struct ffa_device_id tstee_device_ids[] = {
/* TS RPC protocol UUID: bdcd76d7-825e-4751-963b-86d4f84943ac */
{ TS_RPC_UUID },
{}
};
static struct ffa_driver tstee_driver = {
.name = "arm_tstee",
.probe = tstee_probe,
.remove = tstee_remove,
.id_table = tstee_device_ids,
};
module_ffa_driver(tstee_driver);
MODULE_AUTHOR("Balint Dobszay <balint.dobszay@arm.com>");
MODULE_DESCRIPTION("Arm Trusted Services TEE driver");
MODULE_LICENSE("GPL");

92
drivers/tee/tstee/tstee_private.h Normal file
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@ -0,0 +1,92 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2023, Arm Limited
*/
#ifndef TSTEE_PRIVATE_H
#define TSTEE_PRIVATE_H
#include <linux/arm_ffa.h>
#include <linux/bitops.h>
#include <linux/tee_core.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include <linux/xarray.h>
/*
* The description of the ABI implemented in this file is available at
* https://trusted-services.readthedocs.io/en/v1.0.0/developer/service-access-protocols.html#abi
*/
/* UUID of this protocol */
#define TS_RPC_UUID UUID_INIT(0xbdcd76d7, 0x825e, 0x4751, \
0x96, 0x3b, 0x86, 0xd4, 0xf8, 0x49, 0x43, 0xac)
/* Protocol version*/
#define TS_RPC_PROTOCOL_VERSION (1)
/* Status codes */
#define TS_RPC_OK (0)
/* RPC control register */
#define TS_RPC_CTRL_REG (0)
#define OPCODE_MASK GENMASK(15, 0)
#define IFACE_ID_MASK GENMASK(23, 16)
#define TS_RPC_CTRL_OPCODE(x) ((u16)(FIELD_GET(OPCODE_MASK, (x))))
#define TS_RPC_CTRL_IFACE_ID(x) ((u8)(FIELD_GET(IFACE_ID_MASK, (x))))
#define TS_RPC_CTRL_PACK_IFACE_OPCODE(i, o) \
(FIELD_PREP(IFACE_ID_MASK, (i)) | FIELD_PREP(OPCODE_MASK, (o)))
#define TS_RPC_CTRL_SAP_RC BIT(30)
#define TS_RPC_CTRL_SAP_ERR BIT(31)
/* Interface ID for RPC management operations */
#define TS_RPC_MGMT_IFACE_ID (0xff)
/* Management calls */
#define TS_RPC_OP_GET_VERSION (0x0000)
#define TS_RPC_GET_VERSION_RESP (1)
#define TS_RPC_OP_RETRIEVE_MEM (0x0001)
#define TS_RPC_RETRIEVE_MEM_HANDLE_LSW (1)
#define TS_RPC_RETRIEVE_MEM_HANDLE_MSW (2)
#define TS_RPC_RETRIEVE_MEM_TAG_LSW (3)
#define TS_RPC_RETRIEVE_MEM_TAG_MSW (4)
#define TS_RPC_RETRIEVE_MEM_RPC_STATUS (1)
#define TS_RPC_OP_RELINQ_MEM (0x0002)
#define TS_RPC_RELINQ_MEM_HANDLE_LSW (1)
#define TS_RPC_RELINQ_MEM_HANDLE_MSW (2)
#define TS_RPC_RELINQ_MEM_RPC_STATUS (1)
#define TS_RPC_OP_SERVICE_INFO (0x0003)
#define TS_RPC_SERVICE_INFO_UUID0 (1)
#define TS_RPC_SERVICE_INFO_UUID1 (2)
#define TS_RPC_SERVICE_INFO_UUID2 (3)
#define TS_RPC_SERVICE_INFO_UUID3 (4)
#define TS_RPC_SERVICE_INFO_RPC_STATUS (1)
#define TS_RPC_SERVICE_INFO_IFACE (2)
/* Service call */
#define TS_RPC_SERVICE_MEM_HANDLE_LSW (1)
#define TS_RPC_SERVICE_MEM_HANDLE_MSW (2)
#define TS_RPC_SERVICE_REQ_LEN (3)
#define TS_RPC_SERVICE_CLIENT_ID (4)
#define TS_RPC_SERVICE_RPC_STATUS (1)
#define TS_RPC_SERVICE_STATUS (2)
#define TS_RPC_SERVICE_RESP_LEN (3)
struct tstee {
struct ffa_device *ffa_dev;
struct tee_device *teedev;
struct tee_shm_pool *pool;
};
struct ts_session {
u8 iface_id;
};
struct ts_context_data {
struct xarray sess_list;
};
#endif /* TSTEE_PRIVATE_H */

1
include/uapi/linux/tee.h
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@ -56,6 +56,7 @@
*/
#define TEE_IMPL_ID_OPTEE 1
#define TEE_IMPL_ID_AMDTEE 2
#define TEE_IMPL_ID_TSTEE 3
/*
* OP-TEE specific capabilities