drivers/tee/amdtee/call.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2019 Advanced Micro Devices, Inc.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/tee.h>
   8 #include <linux/tee_drv.h>
   9 #include <linux/psp-tee.h>
  10 #include <linux/slab.h>
  11 #include <linux/psp-sev.h>
  12 #include "amdtee_if.h"
  13 #include "amdtee_private.h"
  14
  15 static int tee_params_to_amd_params(struct tee_param *tee, u32 count,
  16                                     struct tee_operation *amd)
  17 {
  18         int i, ret = 0;
  19         u32 type;
  20
  21         if (!count)
  22                 return 0;
  23
  24         if (!tee || !amd || count > TEE_MAX_PARAMS)
  25                 return -EINVAL;
  26
  27         amd->param_types = 0;
  28         for (i = 0; i < count; i++) {
  29                 /* AMD TEE does not support meta parameter */
  30                 if (tee[i].attr > TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT)
  31                         return -EINVAL;
  32
  33                 amd->param_types |= ((tee[i].attr & 0xF) << i * 4);
  34         }
  35
  36         for (i = 0; i < count; i++) {
  37                 type = TEE_PARAM_TYPE_GET(amd->param_types, i);
  38                 pr_debug("%s: type[%d] = 0x%x\n", __func__, i, type);
  39
  40                 if (type == TEE_OP_PARAM_TYPE_INVALID)
  41                         return -EINVAL;
  42
  43                 if (type == TEE_OP_PARAM_TYPE_NONE)
  44                         continue;
  45
  46                 /* It is assumed that all values are within 2^32-1 */
  47                 if (type > TEE_OP_PARAM_TYPE_VALUE_INOUT) {
  48                         u32 buf_id = get_buffer_id(tee[i].u.memref.shm);
  49
  50                         amd->params[i].mref.buf_id = buf_id;
  51                         amd->params[i].mref.offset = tee[i].u.memref.shm_offs;
  52                         amd->params[i].mref.size = tee[i].u.memref.size;
  53                         pr_debug("%s: bufid[%d] = 0x%x, offset[%d] = 0x%x, size[%d] = 0x%x\n",
  54                                  __func__,
  55                                  i, amd->params[i].mref.buf_id,
  56                                  i, amd->params[i].mref.offset,
  57                                  i, amd->params[i].mref.size);
  58                 } else {
  59                         if (tee[i].u.value.c)
  60                                 pr_warn("%s: Discarding value c", __func__);
  61
  62                         amd->params[i].val.a = tee[i].u.value.a;
  63                         amd->params[i].val.b = tee[i].u.value.b;
  64                         pr_debug("%s: a[%d] = 0x%x, b[%d] = 0x%x\n", __func__,
  65                                  i, amd->params[i].val.a,
  66                                  i, amd->params[i].val.b);
  67                 }
  68         }
  69         return ret;
  70 }
  71
  72 static int amd_params_to_tee_params(struct tee_param *tee, u32 count,
  73                                     struct tee_operation *amd)
  74 {
  75         int i, ret = 0;
  76         u32 type;
  77
  78         if (!count)
  79                 return 0;
  80
  81         if (!tee || !amd || count > TEE_MAX_PARAMS)
  82                 return -EINVAL;
  83
  84         /* Assumes amd->param_types is valid */
  85         for (i = 0; i < count; i++) {
  86                 type = TEE_PARAM_TYPE_GET(amd->param_types, i);
  87                 pr_debug("%s: type[%d] = 0x%x\n", __func__, i, type);
  88
  89                 if (type == TEE_OP_PARAM_TYPE_INVALID ||
  90                     type > TEE_OP_PARAM_TYPE_MEMREF_INOUT)
  91                         return -EINVAL;
  92
  93                 if (type == TEE_OP_PARAM_TYPE_NONE ||
  94                     type == TEE_OP_PARAM_TYPE_VALUE_INPUT ||
  95                     type == TEE_OP_PARAM_TYPE_MEMREF_INPUT)
  96                         continue;
  97
  98                 /*
  99                  * It is assumed that buf_id remains unchanged for
 100                  * both open_session and invoke_cmd call
 101                  */
 102                 if (type > TEE_OP_PARAM_TYPE_MEMREF_INPUT) {
 103                         tee[i].u.memref.shm_offs = amd->params[i].mref.offset;
 104                         tee[i].u.memref.size = amd->params[i].mref.size;
 105                         pr_debug("%s: bufid[%d] = 0x%x, offset[%d] = 0x%x, size[%d] = 0x%x\n",
 106                                  __func__,
 107                                  i, amd->params[i].mref.buf_id,
 108                                  i, amd->params[i].mref.offset,
 109                                  i, amd->params[i].mref.size);
 110                 } else {
 111                         /* field 'c' not supported by AMD TEE */
 112                         tee[i].u.value.a = amd->params[i].val.a;
 113                         tee[i].u.value.b = amd->params[i].val.b;
 114                         tee[i].u.value.c = 0;
 115                         pr_debug("%s: a[%d] = 0x%x, b[%d] = 0x%x\n",
 116                                  __func__,
 117                                  i, amd->params[i].val.a,
 118                                  i, amd->params[i].val.b);
 119                 }
 120         }
 121         return ret;
 122 }
 123
 124 int handle_unload_ta(u32 ta_handle)
 125 {
 126         struct tee_cmd_unload_ta cmd = {0};
 127         u32 status;
 128         int ret;
 129
 130         if (!ta_handle)
 131                 return -EINVAL;
 132
 133         cmd.ta_handle = ta_handle;
 134
 135         ret = psp_tee_process_cmd(TEE_CMD_ID_UNLOAD_TA, (void *)&cmd,
 136                                   sizeof(cmd), &status);
 137         if (!ret && status != 0) {
 138                 pr_err("unload ta: status = 0x%x\n", status);
 139                 ret = -EBUSY;
 140         }
 141
 142         return ret;
 143 }
 144
 145 int handle_close_session(u32 ta_handle, u32 info)
 146 {
 147         struct tee_cmd_close_session cmd = {0};
 148         u32 status;
 149         int ret;
 150
 151         if (ta_handle == 0)
 152                 return -EINVAL;
 153
 154         cmd.ta_handle = ta_handle;
 155         cmd.session_info = info;
 156
 157         ret = psp_tee_process_cmd(TEE_CMD_ID_CLOSE_SESSION, (void *)&cmd,
 158                                   sizeof(cmd), &status);
 159         if (!ret && status != 0) {
 160                 pr_err("close session: status = 0x%x\n", status);
 161                 ret = -EBUSY;
 162         }
 163
 164         return ret;
 165 }
 166
 167 void handle_unmap_shmem(u32 buf_id)
 168 {
 169         struct tee_cmd_unmap_shared_mem cmd = {0};
 170         u32 status;
 171         int ret;
 172
 173         cmd.buf_id = buf_id;
 174
 175         ret = psp_tee_process_cmd(TEE_CMD_ID_UNMAP_SHARED_MEM, (void *)&cmd,
 176                                   sizeof(cmd), &status);
 177         if (!ret)
 178                 pr_debug("unmap shared memory: buf_id %u status = 0x%x\n",
 179                          buf_id, status);
 180 }
 181
 182 int handle_invoke_cmd(struct tee_ioctl_invoke_arg *arg, u32 sinfo,
 183                       struct tee_param *p)
 184 {
 185         struct tee_cmd_invoke_cmd cmd = {0};
 186         int ret;
 187
 188         if (!arg || (!p && arg->num_params))
 189                 return -EINVAL;
 190
 191         arg->ret_origin = TEEC_ORIGIN_COMMS;
 192
 193         if (arg->session == 0) {
 194                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 195                 return -EINVAL;
 196         }
 197
 198         ret = tee_params_to_amd_params(p, arg->num_params, &cmd.op);
 199         if (ret) {
 200                 pr_err("invalid Params. Abort invoke command\n");
 201                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 202                 return ret;
 203         }
 204
 205         cmd.ta_handle = get_ta_handle(arg->session);
 206         cmd.cmd_id = arg->func;
 207         cmd.session_info = sinfo;
 208
 209         ret = psp_tee_process_cmd(TEE_CMD_ID_INVOKE_CMD, (void *)&cmd,
 210                                   sizeof(cmd), &arg->ret);
 211         if (ret) {
 212                 arg->ret = TEEC_ERROR_COMMUNICATION;
 213         } else {
 214                 ret = amd_params_to_tee_params(p, arg->num_params, &cmd.op);
 215                 if (unlikely(ret)) {
 216                         pr_err("invoke command: failed to copy output\n");
 217                         arg->ret = TEEC_ERROR_GENERIC;
 218                         return ret;
 219                 }
 220                 arg->ret_origin = cmd.return_origin;
 221                 pr_debug("invoke command: RO = 0x%x ret = 0x%x\n",
 222                          arg->ret_origin, arg->ret);
 223         }
 224
 225         return ret;
 226 }
 227
 228 int handle_map_shmem(u32 count, struct shmem_desc *start, u32 *buf_id)
 229 {
 230         struct tee_cmd_map_shared_mem *cmd;
 231         phys_addr_t paddr;
 232         int ret, i;
 233         u32 status;
 234
 235         if (!count || !start || !buf_id)
 236                 return -EINVAL;
 237
 238         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 239         if (!cmd)
 240                 return -ENOMEM;
 241
 242         /* Size must be page aligned */
 243         for (i = 0; i < count ; i++) {
 244                 if (!start[i].kaddr || (start[i].size & (PAGE_SIZE - 1))) {
 245                         ret = -EINVAL;
 246                         goto free_cmd;
 247                 }
 248
 249                 if ((u64)start[i].kaddr & (PAGE_SIZE - 1)) {
 250                         pr_err("map shared memory: page unaligned. addr 0x%llx",
 251                                (u64)start[i].kaddr);
 252                         ret = -EINVAL;
 253                         goto free_cmd;
 254                 }
 255         }
 256
 257         cmd->sg_list.count = count;
 258
 259         /* Create buffer list */
 260         for (i = 0; i < count ; i++) {
 261                 paddr = __psp_pa(start[i].kaddr);
 262                 cmd->sg_list.buf[i].hi_addr = upper_32_bits(paddr);
 263                 cmd->sg_list.buf[i].low_addr = lower_32_bits(paddr);
 264                 cmd->sg_list.buf[i].size = start[i].size;
 265                 cmd->sg_list.size += cmd->sg_list.buf[i].size;
 266
 267                 pr_debug("buf[%d]:hi addr = 0x%x\n", i,
 268                          cmd->sg_list.buf[i].hi_addr);
 269                 pr_debug("buf[%d]:low addr = 0x%x\n", i,
 270                          cmd->sg_list.buf[i].low_addr);
 271                 pr_debug("buf[%d]:size = 0x%x\n", i, cmd->sg_list.buf[i].size);
 272                 pr_debug("list size = 0x%x\n", cmd->sg_list.size);
 273         }
 274
 275         *buf_id = 0;
 276
 277         ret = psp_tee_process_cmd(TEE_CMD_ID_MAP_SHARED_MEM, (void *)cmd,
 278                                   sizeof(*cmd), &status);
 279         if (!ret && !status) {
 280                 *buf_id = cmd->buf_id;
 281                 pr_debug("mapped buffer ID = 0x%x\n", *buf_id);
 282         } else {
 283                 pr_err("map shared memory: status = 0x%x\n", status);
 284                 ret = -ENOMEM;
 285         }
 286
 287 free_cmd:
 288         kfree(cmd);
 289
 290         return ret;
 291 }
 292
 293 int handle_open_session(struct tee_ioctl_open_session_arg *arg, u32 *info,
 294                         struct tee_param *p)
 295 {
 296         struct tee_cmd_open_session cmd = {0};
 297         int ret;
 298
 299         if (!arg || !info || (!p && arg->num_params))
 300                 return -EINVAL;
 301
 302         arg->ret_origin = TEEC_ORIGIN_COMMS;
 303
 304         if (arg->session == 0) {
 305                 arg->ret = TEEC_ERROR_GENERIC;
 306                 return -EINVAL;
 307         }
 308
 309         ret = tee_params_to_amd_params(p, arg->num_params, &cmd.op);
 310         if (ret) {
 311                 pr_err("invalid Params. Abort open session\n");
 312                 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 313                 return ret;
 314         }
 315
 316         cmd.ta_handle = get_ta_handle(arg->session);
 317         *info = 0;
 318
 319         ret = psp_tee_process_cmd(TEE_CMD_ID_OPEN_SESSION, (void *)&cmd,
 320                                   sizeof(cmd), &arg->ret);
 321         if (ret) {
 322                 arg->ret = TEEC_ERROR_COMMUNICATION;
 323         } else {
 324                 ret = amd_params_to_tee_params(p, arg->num_params, &cmd.op);
 325                 if (unlikely(ret)) {
 326                         pr_err("open session: failed to copy output\n");
 327                         arg->ret = TEEC_ERROR_GENERIC;
 328                         return ret;
 329                 }
 330                 arg->ret_origin = cmd.return_origin;
 331                 *info = cmd.session_info;
 332                 pr_debug("open session: session info = 0x%x\n", *info);
 333         }
 334
 335         pr_debug("open session: ret = 0x%x RO = 0x%x\n", arg->ret,
 336                  arg->ret_origin);
 337
 338         return ret;
 339 }
 340
 341 int handle_load_ta(void *data, u32 size, struct tee_ioctl_open_session_arg *arg)
 342 {
 343         struct tee_cmd_load_ta cmd = {0};
 344         phys_addr_t blob;
 345         int ret;
 346
 347         if (size == 0 || !data || !arg)
 348                 return -EINVAL;
 349
 350         blob = __psp_pa(data);
 351         if (blob & (PAGE_SIZE - 1)) {
 352                 pr_err("load TA: page unaligned. blob 0x%llx", blob);
 353                 return -EINVAL;
 354         }
 355
 356         cmd.hi_addr = upper_32_bits(blob);
 357         cmd.low_addr = lower_32_bits(blob);
 358         cmd.size = size;
 359
 360         ret = psp_tee_process_cmd(TEE_CMD_ID_LOAD_TA, (void *)&cmd,
 361                                   sizeof(cmd), &arg->ret);
 362         if (ret) {
 363                 arg->ret_origin = TEEC_ORIGIN_COMMS;
 364                 arg->ret = TEEC_ERROR_COMMUNICATION;
 365         } else {
 366                 set_session_id(cmd.ta_handle, 0, &arg->session);
 367         }
 368
 369         pr_debug("load TA: TA handle = 0x%x, RO = 0x%x, ret = 0x%x\n",
 370                  cmd.ta_handle, arg->ret_origin, arg->ret);
 371
 372         return 0;
 373 }