Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015-2016, Linaro Limited |
| 3 | * |
| 4 | * This software is licensed under the terms of the GNU General Public |
| 5 | * License version 2, as published by the Free Software Foundation, and |
| 6 | * may be copied, distributed, and modified under those terms. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 16 | |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/tee_drv.h> |
| 21 | #include "optee_private.h" |
| 22 | #include "optee_smc.h" |
| 23 | |
| 24 | struct wq_entry { |
| 25 | struct list_head link; |
| 26 | struct completion c; |
| 27 | u32 key; |
| 28 | }; |
| 29 | |
| 30 | void optee_wait_queue_init(struct optee_wait_queue *priv) |
| 31 | { |
| 32 | mutex_init(&priv->mu); |
| 33 | INIT_LIST_HEAD(&priv->db); |
| 34 | } |
| 35 | |
| 36 | void optee_wait_queue_exit(struct optee_wait_queue *priv) |
| 37 | { |
| 38 | mutex_destroy(&priv->mu); |
| 39 | } |
| 40 | |
| 41 | static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg) |
| 42 | { |
| 43 | struct timespec64 ts; |
| 44 | |
| 45 | if (arg->num_params != 1) |
| 46 | goto bad; |
| 47 | if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != |
| 48 | OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT) |
| 49 | goto bad; |
| 50 | |
| 51 | getnstimeofday64(&ts); |
| 52 | arg->params[0].u.value.a = ts.tv_sec; |
| 53 | arg->params[0].u.value.b = ts.tv_nsec; |
| 54 | |
| 55 | arg->ret = TEEC_SUCCESS; |
| 56 | return; |
| 57 | bad: |
| 58 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 59 | } |
| 60 | |
| 61 | static struct wq_entry *wq_entry_get(struct optee_wait_queue *wq, u32 key) |
| 62 | { |
| 63 | struct wq_entry *w; |
| 64 | |
| 65 | mutex_lock(&wq->mu); |
| 66 | |
| 67 | list_for_each_entry(w, &wq->db, link) |
| 68 | if (w->key == key) |
| 69 | goto out; |
| 70 | |
| 71 | w = kmalloc(sizeof(*w), GFP_KERNEL); |
| 72 | if (w) { |
| 73 | init_completion(&w->c); |
| 74 | w->key = key; |
| 75 | list_add_tail(&w->link, &wq->db); |
| 76 | } |
| 77 | out: |
| 78 | mutex_unlock(&wq->mu); |
| 79 | return w; |
| 80 | } |
| 81 | |
| 82 | static void wq_sleep(struct optee_wait_queue *wq, u32 key) |
| 83 | { |
| 84 | struct wq_entry *w = wq_entry_get(wq, key); |
| 85 | |
| 86 | if (w) { |
| 87 | wait_for_completion(&w->c); |
| 88 | mutex_lock(&wq->mu); |
| 89 | list_del(&w->link); |
| 90 | mutex_unlock(&wq->mu); |
| 91 | kfree(w); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | static void wq_wakeup(struct optee_wait_queue *wq, u32 key) |
| 96 | { |
| 97 | struct wq_entry *w = wq_entry_get(wq, key); |
| 98 | |
| 99 | if (w) |
| 100 | complete(&w->c); |
| 101 | } |
| 102 | |
| 103 | static void handle_rpc_func_cmd_wq(struct optee *optee, |
| 104 | struct optee_msg_arg *arg) |
| 105 | { |
| 106 | if (arg->num_params != 1) |
| 107 | goto bad; |
| 108 | |
| 109 | if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != |
| 110 | OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) |
| 111 | goto bad; |
| 112 | |
| 113 | switch (arg->params[0].u.value.a) { |
| 114 | case OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP: |
| 115 | wq_sleep(&optee->wait_queue, arg->params[0].u.value.b); |
| 116 | break; |
| 117 | case OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP: |
| 118 | wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b); |
| 119 | break; |
| 120 | default: |
| 121 | goto bad; |
| 122 | } |
| 123 | |
| 124 | arg->ret = TEEC_SUCCESS; |
| 125 | return; |
| 126 | bad: |
| 127 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 128 | } |
| 129 | |
| 130 | static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg) |
| 131 | { |
| 132 | u32 msec_to_wait; |
| 133 | |
| 134 | if (arg->num_params != 1) |
| 135 | goto bad; |
| 136 | |
| 137 | if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) != |
| 138 | OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) |
| 139 | goto bad; |
| 140 | |
| 141 | msec_to_wait = arg->params[0].u.value.a; |
| 142 | |
tiger-yu99 | a75ed92 | 2017-05-06 00:20:32 +0800 | [diff] [blame] | 143 | /* Go to interruptible sleep */ |
| 144 | msleep_interruptible(msec_to_wait); |
Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 145 | |
| 146 | arg->ret = TEEC_SUCCESS; |
| 147 | return; |
| 148 | bad: |
| 149 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 150 | } |
| 151 | |
| 152 | static void handle_rpc_supp_cmd(struct tee_context *ctx, |
| 153 | struct optee_msg_arg *arg) |
| 154 | { |
| 155 | struct tee_param *params; |
| 156 | |
| 157 | arg->ret_origin = TEEC_ORIGIN_COMMS; |
| 158 | |
| 159 | params = kmalloc_array(arg->num_params, sizeof(struct tee_param), |
| 160 | GFP_KERNEL); |
| 161 | if (!params) { |
| 162 | arg->ret = TEEC_ERROR_OUT_OF_MEMORY; |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | if (optee_from_msg_param(params, arg->num_params, arg->params)) { |
| 167 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 168 | goto out; |
| 169 | } |
| 170 | |
| 171 | arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params); |
| 172 | |
| 173 | if (optee_to_msg_param(arg->params, arg->num_params, params)) |
| 174 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 175 | out: |
| 176 | kfree(params); |
| 177 | } |
| 178 | |
| 179 | static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz) |
| 180 | { |
| 181 | u32 ret; |
| 182 | struct tee_param param; |
| 183 | struct optee *optee = tee_get_drvdata(ctx->teedev); |
| 184 | struct tee_shm *shm; |
| 185 | |
| 186 | param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; |
| 187 | param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL; |
| 188 | param.u.value.b = sz; |
| 189 | param.u.value.c = 0; |
| 190 | |
| 191 | ret = optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_ALLOC, 1, ¶m); |
| 192 | if (ret) |
| 193 | return ERR_PTR(-ENOMEM); |
| 194 | |
Jens Wiklander | ad675fa | 2016-12-23 13:13:39 +0100 | [diff] [blame^] | 195 | mutex_lock(&optee->supp.mutex); |
Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 196 | /* Increases count as secure world doesn't have a reference */ |
| 197 | shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c); |
Jens Wiklander | ad675fa | 2016-12-23 13:13:39 +0100 | [diff] [blame^] | 198 | mutex_unlock(&optee->supp.mutex); |
Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 199 | return shm; |
| 200 | } |
| 201 | |
| 202 | static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx, |
| 203 | struct optee_msg_arg *arg) |
| 204 | { |
| 205 | phys_addr_t pa; |
| 206 | struct tee_shm *shm; |
| 207 | size_t sz; |
| 208 | size_t n; |
| 209 | |
| 210 | arg->ret_origin = TEEC_ORIGIN_COMMS; |
| 211 | |
| 212 | if (!arg->num_params || |
| 213 | arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) { |
| 214 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | for (n = 1; n < arg->num_params; n++) { |
| 219 | if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) { |
| 220 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 221 | return; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | sz = arg->params[0].u.value.b; |
| 226 | switch (arg->params[0].u.value.a) { |
| 227 | case OPTEE_MSG_RPC_SHM_TYPE_APPL: |
| 228 | shm = cmd_alloc_suppl(ctx, sz); |
| 229 | break; |
| 230 | case OPTEE_MSG_RPC_SHM_TYPE_KERNEL: |
| 231 | shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED); |
| 232 | break; |
| 233 | default: |
| 234 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 235 | return; |
| 236 | } |
| 237 | |
| 238 | if (IS_ERR(shm)) { |
| 239 | arg->ret = TEEC_ERROR_OUT_OF_MEMORY; |
| 240 | return; |
| 241 | } |
| 242 | |
| 243 | if (tee_shm_get_pa(shm, 0, &pa)) { |
| 244 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 245 | goto bad; |
| 246 | } |
| 247 | |
| 248 | arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT; |
| 249 | arg->params[0].u.tmem.buf_ptr = pa; |
| 250 | arg->params[0].u.tmem.size = sz; |
| 251 | arg->params[0].u.tmem.shm_ref = (unsigned long)shm; |
| 252 | arg->ret = TEEC_SUCCESS; |
| 253 | return; |
| 254 | bad: |
| 255 | tee_shm_free(shm); |
| 256 | } |
| 257 | |
| 258 | static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm) |
| 259 | { |
| 260 | struct tee_param param; |
| 261 | |
| 262 | param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT; |
| 263 | param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL; |
| 264 | param.u.value.b = tee_shm_get_id(shm); |
| 265 | param.u.value.c = 0; |
| 266 | |
| 267 | /* |
| 268 | * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure |
| 269 | * world has released its reference. |
| 270 | * |
| 271 | * It's better to do this before sending the request to supplicant |
| 272 | * as we'd like to let the process doing the initial allocation to |
| 273 | * do release the last reference too in order to avoid stacking |
| 274 | * many pending fput() on the client process. This could otherwise |
| 275 | * happen if secure world does many allocate and free in a single |
| 276 | * invoke. |
| 277 | */ |
| 278 | tee_shm_put(shm); |
| 279 | |
| 280 | optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_FREE, 1, ¶m); |
| 281 | } |
| 282 | |
| 283 | static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx, |
| 284 | struct optee_msg_arg *arg) |
| 285 | { |
| 286 | struct tee_shm *shm; |
| 287 | |
| 288 | arg->ret_origin = TEEC_ORIGIN_COMMS; |
| 289 | |
| 290 | if (arg->num_params != 1 || |
| 291 | arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) { |
| 292 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b; |
| 297 | switch (arg->params[0].u.value.a) { |
| 298 | case OPTEE_MSG_RPC_SHM_TYPE_APPL: |
| 299 | cmd_free_suppl(ctx, shm); |
| 300 | break; |
| 301 | case OPTEE_MSG_RPC_SHM_TYPE_KERNEL: |
| 302 | tee_shm_free(shm); |
| 303 | break; |
| 304 | default: |
| 305 | arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| 306 | } |
| 307 | arg->ret = TEEC_SUCCESS; |
| 308 | } |
| 309 | |
| 310 | static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee, |
| 311 | struct tee_shm *shm) |
| 312 | { |
| 313 | struct optee_msg_arg *arg; |
| 314 | |
| 315 | arg = tee_shm_get_va(shm, 0); |
| 316 | if (IS_ERR(arg)) { |
| 317 | pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm); |
| 318 | return; |
| 319 | } |
| 320 | |
| 321 | switch (arg->cmd) { |
| 322 | case OPTEE_MSG_RPC_CMD_GET_TIME: |
| 323 | handle_rpc_func_cmd_get_time(arg); |
| 324 | break; |
| 325 | case OPTEE_MSG_RPC_CMD_WAIT_QUEUE: |
| 326 | handle_rpc_func_cmd_wq(optee, arg); |
| 327 | break; |
| 328 | case OPTEE_MSG_RPC_CMD_SUSPEND: |
| 329 | handle_rpc_func_cmd_wait(arg); |
| 330 | break; |
| 331 | case OPTEE_MSG_RPC_CMD_SHM_ALLOC: |
| 332 | handle_rpc_func_cmd_shm_alloc(ctx, arg); |
| 333 | break; |
| 334 | case OPTEE_MSG_RPC_CMD_SHM_FREE: |
| 335 | handle_rpc_func_cmd_shm_free(ctx, arg); |
| 336 | break; |
| 337 | default: |
| 338 | handle_rpc_supp_cmd(ctx, arg); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * optee_handle_rpc() - handle RPC from secure world |
| 344 | * @ctx: context doing the RPC |
| 345 | * @param: value of registers for the RPC |
| 346 | * |
| 347 | * Result of RPC is written back into @param. |
| 348 | */ |
| 349 | void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param) |
| 350 | { |
| 351 | struct tee_device *teedev = ctx->teedev; |
| 352 | struct optee *optee = tee_get_drvdata(teedev); |
| 353 | struct tee_shm *shm; |
| 354 | phys_addr_t pa; |
| 355 | |
| 356 | switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) { |
| 357 | case OPTEE_SMC_RPC_FUNC_ALLOC: |
| 358 | shm = tee_shm_alloc(ctx, param->a1, TEE_SHM_MAPPED); |
| 359 | if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) { |
| 360 | reg_pair_from_64(¶m->a1, ¶m->a2, pa); |
| 361 | reg_pair_from_64(¶m->a4, ¶m->a5, |
| 362 | (unsigned long)shm); |
| 363 | } else { |
| 364 | param->a1 = 0; |
| 365 | param->a2 = 0; |
| 366 | param->a4 = 0; |
| 367 | param->a5 = 0; |
| 368 | } |
| 369 | break; |
| 370 | case OPTEE_SMC_RPC_FUNC_FREE: |
| 371 | shm = reg_pair_to_ptr(param->a1, param->a2); |
| 372 | tee_shm_free(shm); |
| 373 | break; |
David Wang | 4d04685 | 2017-02-16 16:43:44 +0800 | [diff] [blame] | 374 | case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR: |
Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 375 | /* |
David Wang | 4d04685 | 2017-02-16 16:43:44 +0800 | [diff] [blame] | 376 | * A foreign interrupt was raised while secure world was |
| 377 | * executing, since they are handled in Linux a dummy RPC is |
| 378 | * performed to let Linux take the interrupt through the normal |
Jens Wiklander | 18ebb2f | 2015-04-14 14:33:20 +0200 | [diff] [blame] | 379 | * vector. |
| 380 | */ |
| 381 | break; |
| 382 | case OPTEE_SMC_RPC_FUNC_CMD: |
| 383 | shm = reg_pair_to_ptr(param->a1, param->a2); |
| 384 | handle_rpc_func_cmd(ctx, optee, shm); |
| 385 | break; |
| 386 | default: |
| 387 | pr_warn("Unknown RPC func 0x%x\n", |
| 388 | (u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)); |
| 389 | break; |
| 390 | } |
| 391 | |
| 392 | param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC; |
| 393 | } |