tee/optee/rpc.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2015-2021, Linaro Limited
0004  */
0005
0006 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0007
0008 #include <linux/delay.h>
0009 #include <linux/i2c.h>
0010 #include <linux/slab.h>
0011 #include <linux/tee_drv.h>
0012 #include "optee_private.h"
0013 #include "optee_rpc_cmd.h"
0014
0015 static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
0016 {
0017     struct timespec64 ts;
0018
0019     if (arg->num_params != 1)
0020         goto bad;
0021     if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
0022             OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
0023         goto bad;
0024
0025     ktime_get_real_ts64(&ts);
0026     arg->params[0].u.value.a = ts.tv_sec;
0027     arg->params[0].u.value.b = ts.tv_nsec;
0028
0029     arg->ret = TEEC_SUCCESS;
0030     return;
0031 bad:
0032     arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0033 }
0034
0035 #if IS_REACHABLE(CONFIG_I2C)
0036 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
0037                          struct optee_msg_arg *arg)
0038 {
0039     struct optee *optee = tee_get_drvdata(ctx->teedev);
0040     struct tee_param *params;
0041     struct i2c_adapter *adapter;
0042     struct i2c_msg msg = { };
0043     size_t i;
0044     int ret = -EOPNOTSUPP;
0045     u8 attr[] = {
0046         TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
0047         TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
0048         TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
0049         TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
0050     };
0051
0052     if (arg->num_params != ARRAY_SIZE(attr)) {
0053         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0054         return;
0055     }
0056
0057     params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
0058                    GFP_KERNEL);
0059     if (!params) {
0060         arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
0061         return;
0062     }
0063
0064     if (optee->ops->from_msg_param(optee, params, arg->num_params,
0065                        arg->params))
0066         goto bad;
0067
0068     for (i = 0; i < arg->num_params; i++) {
0069         if (params[i].attr != attr[i])
0070             goto bad;
0071     }
0072
0073     adapter = i2c_get_adapter(params[0].u.value.b);
0074     if (!adapter)
0075         goto bad;
0076
0077     if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
0078         if (!i2c_check_functionality(adapter,
0079                          I2C_FUNC_10BIT_ADDR)) {
0080             i2c_put_adapter(adapter);
0081             goto bad;
0082         }
0083
0084         msg.flags = I2C_M_TEN;
0085     }
0086
0087     msg.addr = params[0].u.value.c;
0088     msg.buf  = params[2].u.memref.shm->kaddr;
0089     msg.len  = params[2].u.memref.size;
0090
0091     switch (params[0].u.value.a) {
0092     case OPTEE_RPC_I2C_TRANSFER_RD:
0093         msg.flags |= I2C_M_RD;
0094         break;
0095     case OPTEE_RPC_I2C_TRANSFER_WR:
0096         break;
0097     default:
0098         i2c_put_adapter(adapter);
0099         goto bad;
0100     }
0101
0102     ret = i2c_transfer(adapter, &msg, 1);
0103
0104     if (ret < 0) {
0105         arg->ret = TEEC_ERROR_COMMUNICATION;
0106     } else {
0107         params[3].u.value.a = msg.len;
0108         if (optee->ops->to_msg_param(optee, arg->params,
0109                          arg->num_params, params))
0110             arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0111         else
0112             arg->ret = TEEC_SUCCESS;
0113     }
0114
0115     i2c_put_adapter(adapter);
0116     kfree(params);
0117     return;
0118 bad:
0119     kfree(params);
0120     arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0121 }
0122 #else
0123 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
0124                          struct optee_msg_arg *arg)
0125 {
0126     arg->ret = TEEC_ERROR_NOT_SUPPORTED;
0127 }
0128 #endif
0129
0130 static void handle_rpc_func_cmd_wq(struct optee *optee,
0131                    struct optee_msg_arg *arg)
0132 {
0133     if (arg->num_params != 1)
0134         goto bad;
0135
0136     if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
0137             OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
0138         goto bad;
0139
0140     switch (arg->params[0].u.value.a) {
0141     case OPTEE_RPC_NOTIFICATION_WAIT:
0142         if (optee_notif_wait(optee, arg->params[0].u.value.b))
0143             goto bad;
0144         break;
0145     case OPTEE_RPC_NOTIFICATION_SEND:
0146         if (optee_notif_send(optee, arg->params[0].u.value.b))
0147             goto bad;
0148         break;
0149     default:
0150         goto bad;
0151     }
0152
0153     arg->ret = TEEC_SUCCESS;
0154     return;
0155 bad:
0156     arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0157 }
0158
0159 static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
0160 {
0161     u32 msec_to_wait;
0162
0163     if (arg->num_params != 1)
0164         goto bad;
0165
0166     if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
0167             OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
0168         goto bad;
0169
0170     msec_to_wait = arg->params[0].u.value.a;
0171
0172     /* Go to interruptible sleep */
0173     msleep_interruptible(msec_to_wait);
0174
0175     arg->ret = TEEC_SUCCESS;
0176     return;
0177 bad:
0178     arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0179 }
0180
0181 static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
0182                 struct optee_msg_arg *arg)
0183 {
0184     struct tee_param *params;
0185
0186     arg->ret_origin = TEEC_ORIGIN_COMMS;
0187
0188     params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
0189                    GFP_KERNEL);
0190     if (!params) {
0191         arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
0192         return;
0193     }
0194
0195     if (optee->ops->from_msg_param(optee, params, arg->num_params,
0196                        arg->params)) {
0197         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0198         goto out;
0199     }
0200
0201     arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
0202
0203     if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
0204                      params))
0205         arg->ret = TEEC_ERROR_BAD_PARAMETERS;
0206 out:
0207     kfree(params);
0208 }
0209
0210 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
0211 {
0212     u32 ret;
0213     struct tee_param param;
0214     struct optee *optee = tee_get_drvdata(ctx->teedev);
0215     struct tee_shm *shm;
0216
0217     param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
0218     param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
0219     param.u.value.b = sz;
0220     param.u.value.c = 0;
0221
0222     ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, &param);
0223     if (ret)
0224         return ERR_PTR(-ENOMEM);
0225
0226     mutex_lock(&optee->supp.mutex);
0227     /* Increases count as secure world doesn't have a reference */
0228     shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
0229     mutex_unlock(&optee->supp.mutex);
0230     return shm;
0231 }
0232
0233 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
0234 {
0235     struct tee_param param;
0236
0237     param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
0238     param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
0239     param.u.value.b = tee_shm_get_id(shm);
0240     param.u.value.c = 0;
0241
0242     /*
0243      * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
0244      * world has released its reference.
0245      *
0246      * It's better to do this before sending the request to supplicant
0247      * as we'd like to let the process doing the initial allocation to
0248      * do release the last reference too in order to avoid stacking
0249      * many pending fput() on the client process. This could otherwise
0250      * happen if secure world does many allocate and free in a single
0251      * invoke.
0252      */
0253     tee_shm_put(shm);
0254
0255     optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, &param);
0256 }
0257
0258 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
0259            struct optee_msg_arg *arg)
0260 {
0261     switch (arg->cmd) {
0262     case OPTEE_RPC_CMD_GET_TIME:
0263         handle_rpc_func_cmd_get_time(arg);
0264         break;
0265     case OPTEE_RPC_CMD_NOTIFICATION:
0266         handle_rpc_func_cmd_wq(optee, arg);
0267         break;
0268     case OPTEE_RPC_CMD_SUSPEND:
0269         handle_rpc_func_cmd_wait(arg);
0270         break;
0271     case OPTEE_RPC_CMD_I2C_TRANSFER:
0272         handle_rpc_func_cmd_i2c_transfer(ctx, arg);
0273         break;
0274     default:
0275         handle_rpc_supp_cmd(ctx, optee, arg);
0276     }
0277 }
0278
0279