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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 | #include <linux/acpi.h> #include <acpi/acpi_drivers.h> #include "tpm.h" static const u8 tpm_ppi_uuid[] = { 0xA6, 0xFA, 0xDD, 0x3D, 0x1B, 0x36, 0xB4, 0x4E, 0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53 }; static char *tpm_device_name = "TPM"; #define TPM_PPI_REVISION_ID 1 #define TPM_PPI_FN_VERSION 1 #define TPM_PPI_FN_SUBREQ 2 #define TPM_PPI_FN_GETREQ 3 #define TPM_PPI_FN_GETACT 4 #define TPM_PPI_FN_GETRSP 5 #define TPM_PPI_FN_SUBREQ2 7 #define TPM_PPI_FN_GETOPR 8 #define PPI_TPM_REQ_MAX 22 #define PPI_VS_REQ_START 128 #define PPI_VS_REQ_END 255 #define PPI_VERSION_LEN 3 static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context, void **return_value) { acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); if (strstr(buffer.pointer, context) != NULL) { *return_value = handle; kfree(buffer.pointer); return AE_CTRL_TERMINATE; } return AE_OK; } static inline void ppi_assign_params(union acpi_object params[4], u64 function_num) { params[0].type = ACPI_TYPE_BUFFER; params[0].buffer.length = sizeof(tpm_ppi_uuid); params[0].buffer.pointer = (char *)tpm_ppi_uuid; params[1].type = ACPI_TYPE_INTEGER; params[1].integer.value = TPM_PPI_REVISION_ID; params[2].type = ACPI_TYPE_INTEGER; params[2].integer.value = function_num; params[3].type = ACPI_TYPE_PACKAGE; params[3].package.count = 0; params[3].package.elements = NULL; } static ssize_t tpm_show_ppi_version(struct device *dev, struct device_attribute *attr, char *buf) { acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; union acpi_object *obj; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_VERSION); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_STRING); if (ACPI_FAILURE(status)) return -ENOMEM; obj = (union acpi_object *)output.pointer; status = scnprintf(buf, PAGE_SIZE, "%s\n", obj->string.pointer); kfree(output.pointer); return status; } static ssize_t tpm_show_ppi_request(struct device *dev, struct device_attribute *attr, char *buf) { acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; union acpi_object *ret_obj; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_GETREQ); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_PACKAGE); if (ACPI_FAILURE(status)) return -ENOMEM; /* * output.pointer should be of package type, including two integers. * The first is function return code, 0 means success and 1 means * error. The second is pending TPM operation requested by the OS, 0 * means none and >0 means operation value. */ ret_obj = ((union acpi_object *)output.pointer)->package.elements; if (ret_obj->type == ACPI_TYPE_INTEGER) { if (ret_obj->integer.value) { status = -EFAULT; goto cleanup; } ret_obj++; if (ret_obj->type == ACPI_TYPE_INTEGER) status = scnprintf(buf, PAGE_SIZE, "%llu\n", ret_obj->integer.value); else status = -EINVAL; } else { status = -EINVAL; } cleanup: kfree(output.pointer); return status; } static ssize_t tpm_store_ppi_request(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { char version[PPI_VERSION_LEN + 1]; acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; union acpi_object obj; u32 req; u64 ret; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_VERSION); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_STRING); if (ACPI_FAILURE(status)) return -ENOMEM; strncpy(version, ((union acpi_object *)output.pointer)->string.pointer, PPI_VERSION_LEN); kfree(output.pointer); output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; /* * the function to submit TPM operation request to pre-os environment * is updated with function index from SUBREQ to SUBREQ2 since PPI * version 1.1 */ if (strcmp(version, "1.1") == -1) params[2].integer.value = TPM_PPI_FN_SUBREQ; else params[2].integer.value = TPM_PPI_FN_SUBREQ2; /* * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS * accept buffer/string/integer type, but some BIOS accept buffer/ * string/package type. For PPI version 1.0 and 1.1, use buffer type * for compatibility, and use package type since 1.2 according to spec. */ if (strcmp(version, "1.2") == -1) { params[3].type = ACPI_TYPE_BUFFER; params[3].buffer.length = sizeof(req); sscanf(buf, "%d", &req); params[3].buffer.pointer = (char *)&req; } else { params[3].package.count = 1; obj.type = ACPI_TYPE_INTEGER; sscanf(buf, "%llu", &obj.integer.value); params[3].package.elements = &obj; } status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_INTEGER); if (ACPI_FAILURE(status)) return -ENOMEM; ret = ((union acpi_object *)output.pointer)->integer.value; if (ret == 0) status = (acpi_status)count; else if (ret == 1) status = -EPERM; else status = -EFAULT; kfree(output.pointer); return status; } static ssize_t tpm_show_ppi_transition_action(struct device *dev, struct device_attribute *attr, char *buf) { char version[PPI_VERSION_LEN + 1]; acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; u32 ret; char *info[] = { "None", "Shutdown", "Reboot", "OS Vendor-specific", "Error", }; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_VERSION); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_STRING); if (ACPI_FAILURE(status)) return -ENOMEM; strncpy(version, ((union acpi_object *)output.pointer)->string.pointer, PPI_VERSION_LEN); /* * PPI spec defines params[3].type as empty package, but some platforms * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for * compatibility, define params[3].type as buffer, if PPI version < 1.2 */ if (strcmp(version, "1.2") == -1) { params[3].type = ACPI_TYPE_BUFFER; params[3].buffer.length = 0; params[3].buffer.pointer = NULL; } params[2].integer.value = TPM_PPI_FN_GETACT; kfree(output.pointer); output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_INTEGER); if (ACPI_FAILURE(status)) return -ENOMEM; ret = ((union acpi_object *)output.pointer)->integer.value; if (ret < ARRAY_SIZE(info) - 1) status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]); else status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ARRAY_SIZE(info)-1]); kfree(output.pointer); return status; } static ssize_t tpm_show_ppi_response(struct device *dev, struct device_attribute *attr, char *buf) { acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; union acpi_object *ret_obj; u64 req; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_GETRSP); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_PACKAGE); if (ACPI_FAILURE(status)) return -ENOMEM; /* * parameter output.pointer should be of package type, including * 3 integers. The first means function return code, the second means * most recent TPM operation request, and the last means response to * the most recent TPM operation request. Only if the first is 0, and * the second integer is not 0, the response makes sense. */ ret_obj = ((union acpi_object *)output.pointer)->package.elements; if (ret_obj->type != ACPI_TYPE_INTEGER) { status = -EINVAL; goto cleanup; } if (ret_obj->integer.value) { status = -EFAULT; goto cleanup; } ret_obj++; if (ret_obj->type != ACPI_TYPE_INTEGER) { status = -EINVAL; goto cleanup; } if (ret_obj->integer.value) { req = ret_obj->integer.value; ret_obj++; if (ret_obj->type != ACPI_TYPE_INTEGER) { status = -EINVAL; goto cleanup; } if (ret_obj->integer.value == 0) status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, "0: Success"); else if (ret_obj->integer.value == 0xFFFFFFF0) status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, "0xFFFFFFF0: User Abort"); else if (ret_obj->integer.value == 0xFFFFFFF1) status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req, "0xFFFFFFF1: BIOS Failure"); else if (ret_obj->integer.value >= 1 && ret_obj->integer.value <= 0x00000FFF) status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n", req, ret_obj->integer.value, "Corresponding TPM error"); else status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n", req, ret_obj->integer.value, "Error"); } else { status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n", ret_obj->integer.value, "No Recent Request"); } cleanup: kfree(output.pointer); return status; } static ssize_t show_ppi_operations(char *buf, u32 start, u32 end) { char *str = buf; char version[PPI_VERSION_LEN]; acpi_handle handle; acpi_status status; struct acpi_object_list input; struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object params[4]; union acpi_object obj; int i; u32 ret; char *info[] = { "Not implemented", "BIOS only", "Blocked for OS by BIOS", "User required", "User not required", }; input.count = 4; ppi_assign_params(params, TPM_PPI_FN_VERSION); input.pointer = params; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, ppi_callback, NULL, tpm_device_name, &handle); if (ACPI_FAILURE(status)) return -ENXIO; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_STRING); if (ACPI_FAILURE(status)) return -ENOMEM; strncpy(version, ((union acpi_object *)output.pointer)->string.pointer, PPI_VERSION_LEN); kfree(output.pointer); output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; if (strcmp(version, "1.2") == -1) return -EPERM; params[2].integer.value = TPM_PPI_FN_GETOPR; params[3].package.count = 1; obj.type = ACPI_TYPE_INTEGER; params[3].package.elements = &obj; for (i = start; i <= end; i++) { obj.integer.value = i; status = acpi_evaluate_object_typed(handle, "_DSM", &input, &output, ACPI_TYPE_INTEGER); if (ACPI_FAILURE(status)) return -ENOMEM; ret = ((union acpi_object *)output.pointer)->integer.value; if (ret > 0 && ret < ARRAY_SIZE(info)) str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n", i, ret, info[ret]); kfree(output.pointer); output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; } return str - buf; } static ssize_t tpm_show_ppi_tcg_operations(struct device *dev, struct device_attribute *attr, char *buf) { return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX); } static ssize_t tpm_show_ppi_vs_operations(struct device *dev, struct device_attribute *attr, char *buf) { return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END); } static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL); static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP, tpm_show_ppi_request, tpm_store_ppi_request); static DEVICE_ATTR(transition_action, S_IRUGO, tpm_show_ppi_transition_action, NULL); static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL); static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL); static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL); static struct attribute *ppi_attrs[] = { &dev_attr_version.attr, &dev_attr_request.attr, &dev_attr_transition_action.attr, &dev_attr_response.attr, &dev_attr_tcg_operations.attr, &dev_attr_vs_operations.attr, NULL, }; static struct attribute_group ppi_attr_grp = { .name = "ppi", .attrs = ppi_attrs }; int tpm_add_ppi(struct kobject *parent) { return sysfs_create_group(parent, &ppi_attr_grp); } EXPORT_SYMBOL_GPL(tpm_add_ppi); void tpm_remove_ppi(struct kobject *parent) { sysfs_remove_group(parent, &ppi_attr_grp); } EXPORT_SYMBOL_GPL(tpm_remove_ppi); MODULE_LICENSE("GPL"); |