diff options
Diffstat (limited to 'drivers/tee/optee/rpc.c')
| -rw-r--r-- | drivers/tee/optee/rpc.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c new file mode 100644 index 000000000..e69bc6380 --- /dev/null +++ b/drivers/tee/optee/rpc.c @@ -0,0 +1,279 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015-2021, Linaro Limited + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/tee_drv.h> +#include "optee_private.h" +#include "optee_rpc_cmd.h" + +static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg) +{ + struct timespec64 ts; + + if (arg->num_params != 1) + goto bad; + if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != + OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT) + goto bad; + + ktime_get_real_ts64(&ts); + arg->params[0].u.value.a = ts.tv_sec; + arg->params[0].u.value.b = ts.tv_nsec; + + arg->ret = TEEC_SUCCESS; + return; +bad: + arg->ret = TEEC_ERROR_BAD_PARAMETERS; +} + +#if IS_REACHABLE(CONFIG_I2C) +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 = { }; + size_t i; + int ret = -EOPNOTSUPP; + u8 attr[] = { + TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, + TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT, + TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT, + }; + + if (arg->num_params != ARRAY_SIZE(attr)) { + arg->ret = TEEC_ERROR_BAD_PARAMETERS; + return; + } + + params = kmalloc_array(arg->num_params, sizeof(struct tee_param), + GFP_KERNEL); + if (!params) { + arg->ret = TEEC_ERROR_OUT_OF_MEMORY; + return; + } + + if (optee->ops->from_msg_param(optee, params, arg->num_params, + arg->params)) + goto bad; + + for (i = 0; i < arg->num_params; i++) { + if (params[i].attr != attr[i]) + goto bad; + } + + adapter = i2c_get_adapter(params[0].u.value.b); + if (!adapter) + goto bad; + + if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) { + if (!i2c_check_functionality(adapter, + I2C_FUNC_10BIT_ADDR)) { + i2c_put_adapter(adapter); + goto bad; + } + + msg.flags = I2C_M_TEN; + } + + msg.addr = params[0].u.value.c; + msg.buf = params[2].u.memref.shm->kaddr; + msg.len = params[2].u.memref.size; + + switch (params[0].u.value.a) { + case OPTEE_RPC_I2C_TRANSFER_RD: + msg.flags |= I2C_M_RD; + break; + case OPTEE_RPC_I2C_TRANSFER_WR: + break; + default: + i2c_put_adapter(adapter); + goto bad; + } + + ret = i2c_transfer(adapter, &msg, 1); + + if (ret < 0) { + arg->ret = TEEC_ERROR_COMMUNICATION; + } else { + params[3].u.value.a = msg.len; + if (optee->ops->to_msg_param(optee, arg->params, + arg->num_params, params)) + arg->ret = TEEC_ERROR_BAD_PARAMETERS; + else + arg->ret = TEEC_SUCCESS; + } + + i2c_put_adapter(adapter); + kfree(params); + return; +bad: + kfree(params); + arg->ret = TEEC_ERROR_BAD_PARAMETERS; +} +#else +static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx, + struct optee_msg_arg *arg) +{ + arg->ret = TEEC_ERROR_NOT_SUPPORTED; +} +#endif + +static void handle_rpc_func_cmd_wq(struct optee *optee, + struct optee_msg_arg *arg) +{ + if (arg->num_params != 1) + goto bad; + + if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != + OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) + goto bad; + + switch (arg->params[0].u.value.a) { + case OPTEE_RPC_NOTIFICATION_WAIT: + if (optee_notif_wait(optee, arg->params[0].u.value.b)) + goto bad; + break; + case OPTEE_RPC_NOTIFICATION_SEND: + if (optee_notif_send(optee, arg->params[0].u.value.b)) + goto bad; + break; + default: + goto bad; + } + + arg->ret = TEEC_SUCCESS; + return; +bad: + arg->ret = TEEC_ERROR_BAD_PARAMETERS; +} + +static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg) +{ + u32 msec_to_wait; + + if (arg->num_params != 1) + goto bad; + + if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != + OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) + goto bad; + + msec_to_wait = arg->params[0].u.value.a; + + /* Go to interruptible sleep */ + msleep_interruptible(msec_to_wait); + + arg->ret = TEEC_SUCCESS; + return; +bad: + arg->ret = TEEC_ERROR_BAD_PARAMETERS; +} + +static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee, + struct optee_msg_arg *arg) +{ + struct tee_param *params; + + arg->ret_origin = TEEC_ORIGIN_COMMS; + + params = kmalloc_array(arg->num_params, sizeof(struct tee_param), + GFP_KERNEL); + if (!params) { + arg->ret = TEEC_ERROR_OUT_OF_MEMORY; + return; + } + + 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->ops->to_msg_param(optee, arg->params, arg->num_params, + params)) + arg->ret = TEEC_ERROR_BAD_PARAMETERS; +out: + kfree(params); +} + +struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz) +{ + u32 ret; + struct tee_param param; + struct optee *optee = tee_get_drvdata(ctx->teedev); + struct tee_shm *shm; + + param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; + param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL; + param.u.value.b = sz; + param.u.value.c = 0; + + ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, ¶m); + if (ret) + return ERR_PTR(-ENOMEM); + + mutex_lock(&optee->supp.mutex); + /* Increases count as secure world doesn't have a reference */ + shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c); + mutex_unlock(&optee->supp.mutex); + return shm; +} + +void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm) +{ + struct tee_param param; + + param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; + param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL; + param.u.value.b = tee_shm_get_id(shm); + param.u.value.c = 0; + + /* + * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure + * world has released its reference. + * + * It's better to do this before sending the request to supplicant + * as we'd like to let the process doing the initial allocation to + * do release the last reference too in order to avoid stacking + * many pending fput() on the client process. This could otherwise + * happen if secure world does many allocate and free in a single + * invoke. + */ + tee_shm_put(shm); + + optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, ¶m); +} + +void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee, + struct optee_msg_arg *arg) +{ + switch (arg->cmd) { + case OPTEE_RPC_CMD_GET_TIME: + handle_rpc_func_cmd_get_time(arg); + break; + case OPTEE_RPC_CMD_NOTIFICATION: + handle_rpc_func_cmd_wq(optee, arg); + break; + case OPTEE_RPC_CMD_SUSPEND: + handle_rpc_func_cmd_wait(arg); + break; + case OPTEE_RPC_CMD_I2C_TRANSFER: + handle_rpc_func_cmd_i2c_transfer(ctx, arg); + break; + default: + handle_rpc_supp_cmd(ctx, optee, arg); + } +} + + |