1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015-2021, Linaro Limited 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/delay.h> 9 #include <linux/i2c.h> 10 #include <linux/slab.h> 11 #include <linux/tee_drv.h> 12 #include "optee_private.h" 13 #include "optee_rpc_cmd.h" 14 15 struct wq_entry { 16 struct list_head link; 17 struct completion c; 18 u32 key; 19 }; 20 21 void optee_wait_queue_init(struct optee_wait_queue *priv) 22 { 23 mutex_init(&priv->mu); 24 INIT_LIST_HEAD(&priv->db); 25 } 26 27 void optee_wait_queue_exit(struct optee_wait_queue *priv) 28 { 29 mutex_destroy(&priv->mu); 30 } 31 32 static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg) 33 { 34 struct timespec64 ts; 35 36 if (arg->num_params != 1) 37 goto bad; 38 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != 39 OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT) 40 goto bad; 41 42 ktime_get_real_ts64(&ts); 43 arg->params[0].u.value.a = ts.tv_sec; 44 arg->params[0].u.value.b = ts.tv_nsec; 45 46 arg->ret = TEEC_SUCCESS; 47 return; 48 bad: 49 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 50 } 51 52 #if IS_REACHABLE(CONFIG_I2C) 53 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx, 54 struct optee_msg_arg *arg) 55 { 56 struct optee *optee = tee_get_drvdata(ctx->teedev); 57 struct tee_param *params; 58 struct i2c_adapter *adapter; 59 struct i2c_msg msg = { }; 60 size_t i; 61 int ret = -EOPNOTSUPP; 62 u8 attr[] = { 63 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, 64 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, 65 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT, 66 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT, 67 }; 68 69 if (arg->num_params != ARRAY_SIZE(attr)) { 70 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 71 return; 72 } 73 74 params = kmalloc_array(arg->num_params, sizeof(struct tee_param), 75 GFP_KERNEL); 76 if (!params) { 77 arg->ret = TEEC_ERROR_OUT_OF_MEMORY; 78 return; 79 } 80 81 if (optee->ops->from_msg_param(optee, params, arg->num_params, 82 arg->params)) 83 goto bad; 84 85 for (i = 0; i < arg->num_params; i++) { 86 if (params[i].attr != attr[i]) 87 goto bad; 88 } 89 90 adapter = i2c_get_adapter(params[0].u.value.b); 91 if (!adapter) 92 goto bad; 93 94 if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) { 95 if (!i2c_check_functionality(adapter, 96 I2C_FUNC_10BIT_ADDR)) { 97 i2c_put_adapter(adapter); 98 goto bad; 99 } 100 101 msg.flags = I2C_M_TEN; 102 } 103 104 msg.addr = params[0].u.value.c; 105 msg.buf = params[2].u.memref.shm->kaddr; 106 msg.len = params[2].u.memref.size; 107 108 switch (params[0].u.value.a) { 109 case OPTEE_RPC_I2C_TRANSFER_RD: 110 msg.flags |= I2C_M_RD; 111 break; 112 case OPTEE_RPC_I2C_TRANSFER_WR: 113 break; 114 default: 115 i2c_put_adapter(adapter); 116 goto bad; 117 } 118 119 ret = i2c_transfer(adapter, &msg, 1); 120 121 if (ret < 0) { 122 arg->ret = TEEC_ERROR_COMMUNICATION; 123 } else { 124 params[3].u.value.a = msg.len; 125 if (optee->ops->to_msg_param(optee, arg->params, 126 arg->num_params, params)) 127 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 128 else 129 arg->ret = TEEC_SUCCESS; 130 } 131 132 i2c_put_adapter(adapter); 133 kfree(params); 134 return; 135 bad: 136 kfree(params); 137 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 138 } 139 #else 140 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx, 141 struct optee_msg_arg *arg) 142 { 143 arg->ret = TEEC_ERROR_NOT_SUPPORTED; 144 } 145 #endif 146 147 static struct wq_entry *wq_entry_get(struct optee_wait_queue *wq, u32 key) 148 { 149 struct wq_entry *w; 150 151 mutex_lock(&wq->mu); 152 153 list_for_each_entry(w, &wq->db, link) 154 if (w->key == key) 155 goto out; 156 157 w = kmalloc(sizeof(*w), GFP_KERNEL); 158 if (w) { 159 init_completion(&w->c); 160 w->key = key; 161 list_add_tail(&w->link, &wq->db); 162 } 163 out: 164 mutex_unlock(&wq->mu); 165 return w; 166 } 167 168 static void wq_sleep(struct optee_wait_queue *wq, u32 key) 169 { 170 struct wq_entry *w = wq_entry_get(wq, key); 171 172 if (w) { 173 wait_for_completion(&w->c); 174 mutex_lock(&wq->mu); 175 list_del(&w->link); 176 mutex_unlock(&wq->mu); 177 kfree(w); 178 } 179 } 180 181 static void wq_wakeup(struct optee_wait_queue *wq, u32 key) 182 { 183 struct wq_entry *w = wq_entry_get(wq, key); 184 185 if (w) 186 complete(&w->c); 187 } 188 189 static void handle_rpc_func_cmd_wq(struct optee *optee, 190 struct optee_msg_arg *arg) 191 { 192 if (arg->num_params != 1) 193 goto bad; 194 195 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != 196 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) 197 goto bad; 198 199 switch (arg->params[0].u.value.a) { 200 case OPTEE_RPC_WAIT_QUEUE_SLEEP: 201 wq_sleep(&optee->wait_queue, arg->params[0].u.value.b); 202 break; 203 case OPTEE_RPC_WAIT_QUEUE_WAKEUP: 204 wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b); 205 break; 206 default: 207 goto bad; 208 } 209 210 arg->ret = TEEC_SUCCESS; 211 return; 212 bad: 213 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 214 } 215 216 static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg) 217 { 218 u32 msec_to_wait; 219 220 if (arg->num_params != 1) 221 goto bad; 222 223 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != 224 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) 225 goto bad; 226 227 msec_to_wait = arg->params[0].u.value.a; 228 229 /* Go to interruptible sleep */ 230 msleep_interruptible(msec_to_wait); 231 232 arg->ret = TEEC_SUCCESS; 233 return; 234 bad: 235 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 236 } 237 238 static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee, 239 struct optee_msg_arg *arg) 240 { 241 struct tee_param *params; 242 243 arg->ret_origin = TEEC_ORIGIN_COMMS; 244 245 params = kmalloc_array(arg->num_params, sizeof(struct tee_param), 246 GFP_KERNEL); 247 if (!params) { 248 arg->ret = TEEC_ERROR_OUT_OF_MEMORY; 249 return; 250 } 251 252 if (optee->ops->from_msg_param(optee, params, arg->num_params, 253 arg->params)) { 254 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 255 goto out; 256 } 257 258 arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params); 259 260 if (optee->ops->to_msg_param(optee, arg->params, arg->num_params, 261 params)) 262 arg->ret = TEEC_ERROR_BAD_PARAMETERS; 263 out: 264 kfree(params); 265 } 266 267 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz) 268 { 269 u32 ret; 270 struct tee_param param; 271 struct optee *optee = tee_get_drvdata(ctx->teedev); 272 struct tee_shm *shm; 273 274 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; 275 param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL; 276 param.u.value.b = sz; 277 param.u.value.c = 0; 278 279 ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, ¶m); 280 if (ret) 281 return ERR_PTR(-ENOMEM); 282 283 mutex_lock(&optee->supp.mutex); 284 /* Increases count as secure world doesn't have a reference */ 285 shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c); 286 mutex_unlock(&optee->supp.mutex); 287 return shm; 288 } 289 290 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm) 291 { 292 struct tee_param param; 293 294 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; 295 param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL; 296 param.u.value.b = tee_shm_get_id(shm); 297 param.u.value.c = 0; 298 299 /* 300 * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure 301 * world has released its reference. 302 * 303 * It's better to do this before sending the request to supplicant 304 * as we'd like to let the process doing the initial allocation to 305 * do release the last reference too in order to avoid stacking 306 * many pending fput() on the client process. This could otherwise 307 * happen if secure world does many allocate and free in a single 308 * invoke. 309 */ 310 tee_shm_put(shm); 311 312 optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, ¶m); 313 } 314 315 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee, 316 struct optee_msg_arg *arg) 317 { 318 switch (arg->cmd) { 319 case OPTEE_RPC_CMD_GET_TIME: 320 handle_rpc_func_cmd_get_time(arg); 321 break; 322 case OPTEE_RPC_CMD_WAIT_QUEUE: 323 handle_rpc_func_cmd_wq(optee, arg); 324 break; 325 case OPTEE_RPC_CMD_SUSPEND: 326 handle_rpc_func_cmd_wait(arg); 327 break; 328 case OPTEE_RPC_CMD_I2C_TRANSFER: 329 handle_rpc_func_cmd_i2c_transfer(ctx, arg); 330 break; 331 default: 332 handle_rpc_supp_cmd(ctx, optee, arg); 333 } 334 } 335 336 337