157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2019 Linaro Ltd.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tee_drv.h>
|
|
#include <linux/uuid.h>
|
|
#include "optee_private.h"
|
|
|
|
static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
|
|
{
|
|
if (ver->impl_id == TEE_IMPL_ID_OPTEE)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int get_devices(struct tee_context *ctx, u32 session,
|
|
struct tee_shm *device_shm, u32 *shm_size,
|
|
u32 func)
|
|
{
|
|
int ret = 0;
|
|
struct tee_ioctl_invoke_arg inv_arg;
|
|
struct tee_param param[4];
|
|
|
|
memset(&inv_arg, 0, sizeof(inv_arg));
|
|
memset(¶m, 0, sizeof(param));
|
|
|
|
inv_arg.func = func;
|
|
inv_arg.session = session;
|
|
inv_arg.num_params = 4;
|
|
|
|
/* Fill invoke cmd params */
|
|
param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
|
|
param[0].u.memref.shm = device_shm;
|
|
param[0].u.memref.size = *shm_size;
|
|
param[0].u.memref.shm_offs = 0;
|
|
|
|
ret = tee_client_invoke_func(ctx, &inv_arg, param);
|
|
if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) &&
|
|
(inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) {
|
|
pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n",
|
|
inv_arg.ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*shm_size = param[0].u.memref.size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int optee_register_device(const uuid_t *device_uuid)
|
|
{
|
|
struct tee_client_device *optee_device = NULL;
|
|
int rc;
|
|
|
|
optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
|
|
if (!optee_device)
|
|
return -ENOMEM;
|
|
|
|
optee_device->dev.bus = &tee_bus_type;
|
|
if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
|
|
kfree(optee_device);
|
|
return -ENOMEM;
|
|
}
|
|
uuid_copy(&optee_device->id.uuid, device_uuid);
|
|
|
|
rc = device_register(&optee_device->dev);
|
|
if (rc) {
|
|
pr_err("device registration failed, err: %d\n", rc);
|
|
kfree(optee_device);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int __optee_enumerate_devices(u32 func)
|
|
{
|
|
const uuid_t pta_uuid =
|
|
UUID_INIT(0x7011a688, 0xddde, 0x4053,
|
|
0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8);
|
|
struct tee_ioctl_open_session_arg sess_arg;
|
|
struct tee_shm *device_shm = NULL;
|
|
const uuid_t *device_uuid = NULL;
|
|
struct tee_context *ctx = NULL;
|
|
u32 shm_size = 0, idx, num_devices = 0;
|
|
int rc;
|
|
|
|
memset(&sess_arg, 0, sizeof(sess_arg));
|
|
|
|
/* Open context with OP-TEE driver */
|
|
ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL);
|
|
if (IS_ERR(ctx))
|
|
return -ENODEV;
|
|
|
|
/* Open session with device enumeration pseudo TA */
|
|
export_uuid(sess_arg.uuid, &pta_uuid);
|
|
sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
|
|
sess_arg.num_params = 0;
|
|
|
|
rc = tee_client_open_session(ctx, &sess_arg, NULL);
|
|
if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) {
|
|
/* Device enumeration pseudo TA not found */
|
|
rc = 0;
|
|
goto out_ctx;
|
|
}
|
|
|
|
rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
|
|
if (rc < 0 || !shm_size)
|
|
goto out_sess;
|
|
|
|
device_shm = tee_shm_alloc(ctx, shm_size,
|
|
TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
|
|
if (IS_ERR(device_shm)) {
|
|
pr_err("tee_shm_alloc failed\n");
|
|
rc = PTR_ERR(device_shm);
|
|
goto out_sess;
|
|
}
|
|
|
|
rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
|
|
if (rc < 0)
|
|
goto out_shm;
|
|
|
|
device_uuid = tee_shm_get_va(device_shm, 0);
|
|
if (IS_ERR(device_uuid)) {
|
|
pr_err("tee_shm_get_va failed\n");
|
|
rc = PTR_ERR(device_uuid);
|
|
goto out_shm;
|
|
}
|
|
|
|
num_devices = shm_size / sizeof(uuid_t);
|
|
|
|
for (idx = 0; idx < num_devices; idx++) {
|
|
rc = optee_register_device(&device_uuid[idx]);
|
|
if (rc)
|
|
goto out_shm;
|
|
}
|
|
|
|
out_shm:
|
|
tee_shm_free(device_shm);
|
|
out_sess:
|
|
tee_client_close_session(ctx, sess_arg.session);
|
|
out_ctx:
|
|
tee_client_close_context(ctx);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int optee_enumerate_devices(u32 func)
|
|
{
|
|
return __optee_enumerate_devices(func);
|
|
}
|