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// 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"
/*
* Get device UUIDs
*
* [out] memref[0] Array of device UUIDs
*
* Return codes:
* TEE_SUCCESS - Invoke command success
* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
* TEE_ERROR_SHORT_BUFFER - Output buffer size less than required
*/
#define PTA_CMD_GET_DEVICES 0x0
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)
{
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));
/* Invoke PTA_CMD_GET_DEVICES function */
inv_arg.func = PTA_CMD_GET_DEVICES;
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, u32 device_id)
{
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;
dev_set_name(&optee_device->dev, "optee-clnt%u", device_id);
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;
}
int optee_enumerate_devices(void)
{
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 */
memcpy(sess_arg.uuid, pta_uuid.b, TEE_IOCTL_UUID_LEN);
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);
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);
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], 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;
}
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