1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sysfs.c - ACPI sysfs interface to userspace. 4 */ 5 6 #define pr_fmt(fmt) "ACPI: " fmt 7 8 #include <linux/acpi.h> 9 #include <linux/bitmap.h> 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/kstrtox.h> 13 #include <linux/moduleparam.h> 14 15 #include "internal.h" 16 17 #ifdef CONFIG_ACPI_DEBUG 18 /* 19 * ACPI debug sysfs I/F, including: 20 * /sys/module/acpi/parameters/debug_layer 21 * /sys/module/acpi/parameters/debug_level 22 * /sys/module/acpi/parameters/trace_method_name 23 * /sys/module/acpi/parameters/trace_state 24 * /sys/module/acpi/parameters/trace_debug_layer 25 * /sys/module/acpi/parameters/trace_debug_level 26 */ 27 28 struct acpi_dlayer { 29 const char *name; 30 unsigned long value; 31 }; 32 struct acpi_dlevel { 33 const char *name; 34 unsigned long value; 35 }; 36 #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v } 37 38 static const struct acpi_dlayer acpi_debug_layers[] = { 39 ACPI_DEBUG_INIT(ACPI_UTILITIES), 40 ACPI_DEBUG_INIT(ACPI_HARDWARE), 41 ACPI_DEBUG_INIT(ACPI_EVENTS), 42 ACPI_DEBUG_INIT(ACPI_TABLES), 43 ACPI_DEBUG_INIT(ACPI_NAMESPACE), 44 ACPI_DEBUG_INIT(ACPI_PARSER), 45 ACPI_DEBUG_INIT(ACPI_DISPATCHER), 46 ACPI_DEBUG_INIT(ACPI_EXECUTER), 47 ACPI_DEBUG_INIT(ACPI_RESOURCES), 48 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER), 49 ACPI_DEBUG_INIT(ACPI_OS_SERVICES), 50 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER), 51 ACPI_DEBUG_INIT(ACPI_COMPILER), 52 ACPI_DEBUG_INIT(ACPI_TOOLS), 53 }; 54 55 static const struct acpi_dlevel acpi_debug_levels[] = { 56 ACPI_DEBUG_INIT(ACPI_LV_INIT), 57 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT), 58 ACPI_DEBUG_INIT(ACPI_LV_INFO), 59 ACPI_DEBUG_INIT(ACPI_LV_REPAIR), 60 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT), 61 62 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES), 63 ACPI_DEBUG_INIT(ACPI_LV_PARSE), 64 ACPI_DEBUG_INIT(ACPI_LV_LOAD), 65 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH), 66 ACPI_DEBUG_INIT(ACPI_LV_EXEC), 67 ACPI_DEBUG_INIT(ACPI_LV_NAMES), 68 ACPI_DEBUG_INIT(ACPI_LV_OPREGION), 69 ACPI_DEBUG_INIT(ACPI_LV_BFIELD), 70 ACPI_DEBUG_INIT(ACPI_LV_TABLES), 71 ACPI_DEBUG_INIT(ACPI_LV_VALUES), 72 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS), 73 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES), 74 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS), 75 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE), 76 77 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS), 78 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS), 79 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS), 80 81 ACPI_DEBUG_INIT(ACPI_LV_MUTEX), 82 ACPI_DEBUG_INIT(ACPI_LV_THREADS), 83 ACPI_DEBUG_INIT(ACPI_LV_IO), 84 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS), 85 86 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE), 87 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO), 88 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES), 89 ACPI_DEBUG_INIT(ACPI_LV_EVENTS), 90 }; 91 92 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp) 93 { 94 int result = 0; 95 int i; 96 97 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 98 99 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) { 100 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 101 acpi_debug_layers[i].name, 102 acpi_debug_layers[i].value, 103 (acpi_dbg_layer & acpi_debug_layers[i].value) 104 ? '*' : ' '); 105 } 106 result += 107 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS", 108 ACPI_ALL_DRIVERS, 109 (acpi_dbg_layer & ACPI_ALL_DRIVERS) == 110 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS) 111 == 0 ? ' ' : '-'); 112 result += 113 sprintf(buffer + result, 114 "--\ndebug_layer = 0x%08X ( * = enabled)\n", 115 acpi_dbg_layer); 116 117 return result; 118 } 119 120 static int param_get_debug_level(char *buffer, const struct kernel_param *kp) 121 { 122 int result = 0; 123 int i; 124 125 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 126 127 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) { 128 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 129 acpi_debug_levels[i].name, 130 acpi_debug_levels[i].value, 131 (acpi_dbg_level & acpi_debug_levels[i].value) 132 ? '*' : ' '); 133 } 134 result += 135 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n", 136 acpi_dbg_level); 137 138 return result; 139 } 140 141 static const struct kernel_param_ops param_ops_debug_layer = { 142 .set = param_set_uint, 143 .get = param_get_debug_layer, 144 }; 145 146 static const struct kernel_param_ops param_ops_debug_level = { 147 .set = param_set_uint, 148 .get = param_get_debug_level, 149 }; 150 151 module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644); 152 module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644); 153 154 static char trace_method_name[1024]; 155 156 static int param_set_trace_method_name(const char *val, 157 const struct kernel_param *kp) 158 { 159 u32 saved_flags = 0; 160 bool is_abs_path = true; 161 162 if (*val != '\\') 163 is_abs_path = false; 164 165 if ((is_abs_path && strlen(val) > 1023) || 166 (!is_abs_path && strlen(val) > 1022)) { 167 pr_err("%s: string parameter too long\n", kp->name); 168 return -ENOSPC; 169 } 170 171 /* 172 * It's not safe to update acpi_gbl_trace_method_name without 173 * having the tracer stopped, so we save the original tracer 174 * state and disable it. 175 */ 176 saved_flags = acpi_gbl_trace_flags; 177 (void)acpi_debug_trace(NULL, 178 acpi_gbl_trace_dbg_level, 179 acpi_gbl_trace_dbg_layer, 180 0); 181 182 /* This is a hack. We can't kmalloc in early boot. */ 183 if (is_abs_path) 184 strcpy(trace_method_name, val); 185 else { 186 trace_method_name[0] = '\\'; 187 strcpy(trace_method_name+1, val); 188 } 189 190 /* Restore the original tracer state */ 191 (void)acpi_debug_trace(trace_method_name, 192 acpi_gbl_trace_dbg_level, 193 acpi_gbl_trace_dbg_layer, 194 saved_flags); 195 196 return 0; 197 } 198 199 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp) 200 { 201 return sysfs_emit(buffer, "%s\n", acpi_gbl_trace_method_name); 202 } 203 204 static const struct kernel_param_ops param_ops_trace_method = { 205 .set = param_set_trace_method_name, 206 .get = param_get_trace_method_name, 207 }; 208 209 static const struct kernel_param_ops param_ops_trace_attrib = { 210 .set = param_set_uint, 211 .get = param_get_uint, 212 }; 213 214 module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644); 215 module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644); 216 module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644); 217 218 static int param_set_trace_state(const char *val, 219 const struct kernel_param *kp) 220 { 221 acpi_status status; 222 const char *method = trace_method_name; 223 u32 flags = 0; 224 225 /* So "xxx-once" comparison should go prior than "xxx" comparison */ 226 #define acpi_compare_param(val, key) \ 227 strncmp((val), (key), sizeof(key) - 1) 228 229 if (!acpi_compare_param(val, "enable")) { 230 method = NULL; 231 flags = ACPI_TRACE_ENABLED; 232 } else if (!acpi_compare_param(val, "disable")) 233 method = NULL; 234 else if (!acpi_compare_param(val, "method-once")) 235 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT; 236 else if (!acpi_compare_param(val, "method")) 237 flags = ACPI_TRACE_ENABLED; 238 else if (!acpi_compare_param(val, "opcode-once")) 239 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE; 240 else if (!acpi_compare_param(val, "opcode")) 241 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE; 242 else 243 return -EINVAL; 244 245 status = acpi_debug_trace(method, 246 acpi_gbl_trace_dbg_level, 247 acpi_gbl_trace_dbg_layer, 248 flags); 249 if (ACPI_FAILURE(status)) 250 return -EBUSY; 251 252 return 0; 253 } 254 255 static int param_get_trace_state(char *buffer, const struct kernel_param *kp) 256 { 257 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED)) 258 return sprintf(buffer, "disable\n"); 259 if (!acpi_gbl_trace_method_name) 260 return sprintf(buffer, "enable\n"); 261 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) 262 return sprintf(buffer, "method-once\n"); 263 else 264 return sprintf(buffer, "method\n"); 265 } 266 267 module_param_call(trace_state, param_set_trace_state, param_get_trace_state, 268 NULL, 0644); 269 #endif /* CONFIG_ACPI_DEBUG */ 270 271 272 /* /sys/module/acpi/parameters/aml_debug_output */ 273 274 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object, 275 byte, 0644); 276 MODULE_PARM_DESC(aml_debug_output, 277 "To enable/disable the ACPI Debug Object output."); 278 279 /* /sys/module/acpi/parameters/acpica_version */ 280 static int param_get_acpica_version(char *buffer, 281 const struct kernel_param *kp) 282 { 283 int result; 284 285 result = sprintf(buffer, "%x\n", ACPI_CA_VERSION); 286 287 return result; 288 } 289 290 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); 291 292 /* 293 * ACPI table sysfs I/F: 294 * /sys/firmware/acpi/tables/ 295 * /sys/firmware/acpi/tables/data/ 296 * /sys/firmware/acpi/tables/dynamic/ 297 */ 298 299 static LIST_HEAD(acpi_table_attr_list); 300 static struct kobject *tables_kobj; 301 static struct kobject *tables_data_kobj; 302 static struct kobject *dynamic_tables_kobj; 303 static struct kobject *hotplug_kobj; 304 305 #define ACPI_MAX_TABLE_INSTANCES 999 306 #define ACPI_INST_SIZE 4 /* including trailing 0 */ 307 308 struct acpi_table_attr { 309 struct bin_attribute attr; 310 char name[ACPI_NAMESEG_SIZE]; 311 int instance; 312 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE]; 313 struct list_head node; 314 }; 315 316 struct acpi_data_attr { 317 struct bin_attribute attr; 318 u64 addr; 319 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE]; 320 }; 321 322 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj, 323 const struct bin_attribute *bin_attr, char *buf, 324 loff_t offset, size_t count) 325 { 326 struct acpi_table_attr *table_attr = 327 container_of(bin_attr, struct acpi_table_attr, attr); 328 struct acpi_table_header *table_header = NULL; 329 acpi_status status; 330 ssize_t rc; 331 332 status = acpi_get_table(table_attr->name, table_attr->instance, 333 &table_header); 334 if (ACPI_FAILURE(status)) 335 return -ENODEV; 336 337 rc = memory_read_from_buffer(buf, count, &offset, table_header, 338 table_header->length); 339 acpi_put_table(table_header); 340 return rc; 341 } 342 343 static int acpi_table_attr_init(struct kobject *tables_obj, 344 struct acpi_table_attr *table_attr, 345 struct acpi_table_header *table_header) 346 { 347 struct acpi_table_header *header = NULL; 348 struct acpi_table_attr *attr = NULL; 349 char instance_str[ACPI_INST_SIZE]; 350 351 sysfs_attr_init(&table_attr->attr.attr); 352 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature); 353 354 list_for_each_entry(attr, &acpi_table_attr_list, node) { 355 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name)) 356 if (table_attr->instance < attr->instance) 357 table_attr->instance = attr->instance; 358 } 359 table_attr->instance++; 360 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) { 361 pr_warn("%4.4s: too many table instances\n", table_attr->name); 362 return -ERANGE; 363 } 364 365 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature); 366 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0'; 367 if (table_attr->instance > 1 || (table_attr->instance == 1 && 368 !acpi_get_table 369 (table_header->signature, 2, &header))) { 370 snprintf(instance_str, sizeof(instance_str), "%u", 371 table_attr->instance); 372 strcat(table_attr->filename, instance_str); 373 } 374 375 table_attr->attr.size = table_header->length; 376 table_attr->attr.read = acpi_table_show; 377 table_attr->attr.attr.name = table_attr->filename; 378 table_attr->attr.attr.mode = 0400; 379 380 return sysfs_create_bin_file(tables_obj, &table_attr->attr); 381 } 382 383 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context) 384 { 385 struct acpi_table_attr *table_attr; 386 387 switch (event) { 388 case ACPI_TABLE_EVENT_INSTALL: 389 table_attr = kzalloc_obj(*table_attr); 390 if (!table_attr) 391 return AE_NO_MEMORY; 392 393 if (acpi_table_attr_init(dynamic_tables_kobj, 394 table_attr, table)) { 395 kfree(table_attr); 396 return AE_ERROR; 397 } 398 list_add_tail(&table_attr->node, &acpi_table_attr_list); 399 break; 400 case ACPI_TABLE_EVENT_LOAD: 401 case ACPI_TABLE_EVENT_UNLOAD: 402 case ACPI_TABLE_EVENT_UNINSTALL: 403 /* 404 * we do not need to do anything right now 405 * because the table is not deleted from the 406 * global table list when unloading it. 407 */ 408 break; 409 default: 410 return AE_BAD_PARAMETER; 411 } 412 return AE_OK; 413 } 414 415 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj, 416 const struct bin_attribute *bin_attr, char *buf, 417 loff_t offset, size_t count) 418 { 419 struct acpi_data_attr *data_attr; 420 void __iomem *base; 421 ssize_t size; 422 423 data_attr = container_of(bin_attr, struct acpi_data_attr, attr); 424 size = data_attr->attr.size; 425 426 if (offset < 0) 427 return -EINVAL; 428 429 if (offset >= size) 430 return 0; 431 432 if (count > size - offset) 433 count = size - offset; 434 435 base = acpi_os_map_iomem(data_attr->addr, size); 436 if (!base) 437 return -ENOMEM; 438 439 memcpy_fromio(buf, base + offset, count); 440 441 acpi_os_unmap_iomem(base, size); 442 443 return count; 444 } 445 446 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr) 447 { 448 struct acpi_table_bert *bert = th; 449 450 if (bert->header.length < sizeof(struct acpi_table_bert) || 451 bert->region_length < sizeof(struct acpi_bert_region)) { 452 kfree(data_attr); 453 return -EINVAL; 454 } 455 data_attr->addr = bert->address; 456 data_attr->attr.size = bert->region_length; 457 458 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); 459 } 460 461 static int acpi_ccel_data_init(void *th, struct acpi_data_attr *data_attr) 462 { 463 struct acpi_table_ccel *ccel = th; 464 465 if (ccel->header.length < sizeof(struct acpi_table_ccel) || 466 !ccel->log_area_start_address || !ccel->log_area_minimum_length) { 467 kfree(data_attr); 468 return -EINVAL; 469 } 470 data_attr->addr = ccel->log_area_start_address; 471 data_attr->attr.size = ccel->log_area_minimum_length; 472 473 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); 474 } 475 476 static struct acpi_data_obj { 477 char *name; 478 int (*fn)(void *, struct acpi_data_attr *); 479 } acpi_data_objs[] = { 480 { ACPI_SIG_BERT, acpi_bert_data_init }, 481 { ACPI_SIG_CCEL, acpi_ccel_data_init }, 482 }; 483 484 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs) 485 486 static int acpi_table_data_init(struct acpi_table_header *th, struct acpi_table_attr *table_attr) 487 { 488 struct acpi_data_attr *data_attr; 489 int i; 490 491 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) { 492 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) { 493 data_attr = kzalloc_obj(*data_attr); 494 if (!data_attr) 495 return -ENOMEM; 496 sysfs_attr_init(&data_attr->attr.attr); 497 data_attr->attr.read = acpi_data_show; 498 data_attr->attr.attr.mode = 0400; 499 strscpy(data_attr->filename, table_attr->filename); 500 data_attr->attr.attr.name = data_attr->filename; 501 return acpi_data_objs[i].fn(th, data_attr); 502 } 503 } 504 return 0; 505 } 506 507 static int acpi_tables_sysfs_init(void) 508 { 509 struct acpi_table_attr *table_attr; 510 struct acpi_table_header *table_header = NULL; 511 int table_index; 512 acpi_status status; 513 int ret; 514 515 tables_kobj = kobject_create_and_add("tables", acpi_kobj); 516 if (!tables_kobj) 517 goto err; 518 519 tables_data_kobj = kobject_create_and_add("data", tables_kobj); 520 if (!tables_data_kobj) 521 goto err_tables_data; 522 523 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj); 524 if (!dynamic_tables_kobj) 525 goto err_dynamic_tables; 526 527 for (table_index = 0;; table_index++) { 528 status = acpi_get_table_by_index(table_index, &table_header); 529 530 if (status == AE_BAD_PARAMETER) 531 break; 532 533 if (ACPI_FAILURE(status)) 534 continue; 535 536 table_attr = kzalloc_obj(*table_attr); 537 if (!table_attr) 538 return -ENOMEM; 539 540 ret = acpi_table_attr_init(tables_kobj, 541 table_attr, table_header); 542 if (ret) { 543 kfree(table_attr); 544 return ret; 545 } 546 list_add_tail(&table_attr->node, &acpi_table_attr_list); 547 acpi_table_data_init(table_header, table_attr); 548 } 549 550 kobject_uevent(tables_kobj, KOBJ_ADD); 551 kobject_uevent(tables_data_kobj, KOBJ_ADD); 552 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD); 553 554 return 0; 555 err_dynamic_tables: 556 kobject_put(tables_data_kobj); 557 err_tables_data: 558 kobject_put(tables_kobj); 559 err: 560 return -ENOMEM; 561 } 562 563 /* 564 * Detailed ACPI IRQ counters: 565 * /sys/firmware/acpi/interrupts/ 566 */ 567 568 u32 acpi_irq_handled; 569 u32 acpi_irq_not_handled; 570 571 #define COUNT_GPE 0 572 #define COUNT_SCI 1 /* acpi_irq_handled */ 573 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */ 574 #define COUNT_ERROR 3 /* other */ 575 #define NUM_COUNTERS_EXTRA 4 576 577 struct event_counter { 578 u32 count; 579 u32 flags; 580 }; 581 582 static struct event_counter *all_counters; 583 static u32 num_gpes; 584 static u32 num_counters; 585 static struct attribute **all_attrs; 586 static u32 acpi_gpe_count; 587 588 static struct attribute_group interrupt_stats_attr_group = { 589 .name = "interrupts", 590 }; 591 592 static struct kobj_attribute *counter_attrs; 593 594 static void delete_gpe_attr_array(void) 595 { 596 struct event_counter *tmp = all_counters; 597 598 all_counters = NULL; 599 kfree(tmp); 600 601 if (counter_attrs) { 602 int i; 603 604 for (i = 0; i < num_gpes; i++) 605 kfree(counter_attrs[i].attr.name); 606 607 kfree(counter_attrs); 608 } 609 kfree(all_attrs); 610 } 611 612 static void gpe_count(u32 gpe_number) 613 { 614 acpi_gpe_count++; 615 616 if (!all_counters) 617 return; 618 619 if (gpe_number < num_gpes) 620 all_counters[gpe_number].count++; 621 else 622 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 623 COUNT_ERROR].count++; 624 } 625 626 static void fixed_event_count(u32 event_number) 627 { 628 if (!all_counters) 629 return; 630 631 if (event_number < ACPI_NUM_FIXED_EVENTS) 632 all_counters[num_gpes + event_number].count++; 633 else 634 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 635 COUNT_ERROR].count++; 636 } 637 638 static void acpi_global_event_handler(u32 event_type, acpi_handle device, 639 u32 event_number, void *context) 640 { 641 if (event_type == ACPI_EVENT_TYPE_GPE) { 642 gpe_count(event_number); 643 pr_debug("GPE event 0x%02x\n", event_number); 644 } else if (event_type == ACPI_EVENT_TYPE_FIXED) { 645 fixed_event_count(event_number); 646 pr_debug("Fixed event 0x%02x\n", event_number); 647 } else { 648 pr_debug("Other event 0x%02x\n", event_number); 649 } 650 } 651 652 static int get_status(u32 index, acpi_event_status *ret, 653 acpi_handle *handle) 654 { 655 acpi_status status; 656 657 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 658 return -EINVAL; 659 660 if (index < num_gpes) { 661 status = acpi_get_gpe_device(index, handle); 662 if (ACPI_FAILURE(status)) { 663 pr_warn("Invalid GPE 0x%x", index); 664 return -ENXIO; 665 } 666 status = acpi_get_gpe_status(*handle, index, ret); 667 } else { 668 status = acpi_get_event_status(index - num_gpes, ret); 669 } 670 if (ACPI_FAILURE(status)) 671 return -EIO; 672 673 return 0; 674 } 675 676 static ssize_t counter_show(struct kobject *kobj, 677 struct kobj_attribute *attr, char *buf) 678 { 679 int index = attr - counter_attrs; 680 int size; 681 acpi_handle handle; 682 acpi_event_status status; 683 int result = 0; 684 685 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count = 686 acpi_irq_handled; 687 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count = 688 acpi_irq_not_handled; 689 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count = 690 acpi_gpe_count; 691 size = sysfs_emit(buf, "%8u", all_counters[index].count); 692 693 /* "gpe_all" or "sci" */ 694 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 695 goto end; 696 697 result = get_status(index, &status, &handle); 698 if (result) 699 goto end; 700 701 if (status & ACPI_EVENT_FLAG_ENABLE_SET) 702 size += sysfs_emit_at(buf, size, " EN"); 703 else 704 size += sysfs_emit_at(buf, size, " "); 705 if (status & ACPI_EVENT_FLAG_STATUS_SET) 706 size += sysfs_emit_at(buf, size, " STS"); 707 else 708 size += sysfs_emit_at(buf, size, " "); 709 710 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) 711 size += sysfs_emit_at(buf, size, " invalid "); 712 else if (status & ACPI_EVENT_FLAG_ENABLED) 713 size += sysfs_emit_at(buf, size, " enabled "); 714 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED) 715 size += sysfs_emit_at(buf, size, " wake_enabled"); 716 else 717 size += sysfs_emit_at(buf, size, " disabled "); 718 if (status & ACPI_EVENT_FLAG_MASKED) 719 size += sysfs_emit_at(buf, size, " masked "); 720 else 721 size += sysfs_emit_at(buf, size, " unmasked"); 722 723 end: 724 size += sysfs_emit_at(buf, size, "\n"); 725 return result ? result : size; 726 } 727 728 /* 729 * counter_set() sets the specified counter. 730 * setting the total "sci" file to any value clears all counters. 731 * enable/disable/clear a gpe/fixed event in user space. 732 */ 733 static ssize_t counter_set(struct kobject *kobj, 734 struct kobj_attribute *attr, const char *buf, 735 size_t size) 736 { 737 int index = attr - counter_attrs; 738 acpi_event_status status; 739 acpi_handle handle; 740 int result = 0; 741 unsigned long tmp; 742 743 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) { 744 int i; 745 for (i = 0; i < num_counters; ++i) 746 all_counters[i].count = 0; 747 acpi_gpe_count = 0; 748 acpi_irq_handled = 0; 749 acpi_irq_not_handled = 0; 750 goto end; 751 } 752 753 /* show the event status for both GPEs and Fixed Events */ 754 result = get_status(index, &status, &handle); 755 if (result) 756 goto end; 757 758 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) { 759 pr_warn("Can not change Invalid GPE/Fixed Event status\n"); 760 return -EINVAL; 761 } 762 763 if (index < num_gpes) { 764 if (!strcmp(buf, "disable\n") && 765 (status & ACPI_EVENT_FLAG_ENABLED)) 766 result = acpi_disable_gpe(handle, index); 767 else if (!strcmp(buf, "enable\n") && 768 !(status & ACPI_EVENT_FLAG_ENABLED)) 769 result = acpi_enable_gpe(handle, index); 770 else if (!strcmp(buf, "clear\n") && 771 (status & ACPI_EVENT_FLAG_STATUS_SET)) 772 result = acpi_clear_gpe(handle, index); 773 else if (!strcmp(buf, "mask\n")) 774 result = acpi_mask_gpe(handle, index, TRUE); 775 else if (!strcmp(buf, "unmask\n")) 776 result = acpi_mask_gpe(handle, index, FALSE); 777 else if (!kstrtoul(buf, 0, &tmp)) 778 all_counters[index].count = tmp; 779 else 780 result = -EINVAL; 781 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) { 782 int event = index - num_gpes; 783 if (!strcmp(buf, "disable\n") && 784 (status & ACPI_EVENT_FLAG_ENABLE_SET)) 785 result = acpi_disable_event(event, ACPI_NOT_ISR); 786 else if (!strcmp(buf, "enable\n") && 787 !(status & ACPI_EVENT_FLAG_ENABLE_SET)) 788 result = acpi_enable_event(event, ACPI_NOT_ISR); 789 else if (!strcmp(buf, "clear\n") && 790 (status & ACPI_EVENT_FLAG_STATUS_SET)) 791 result = acpi_clear_event(event); 792 else if (!kstrtoul(buf, 0, &tmp)) 793 all_counters[index].count = tmp; 794 else 795 result = -EINVAL; 796 } else 797 all_counters[index].count = strtoul(buf, NULL, 0); 798 799 if (ACPI_FAILURE(result)) 800 result = -EINVAL; 801 end: 802 return result ? result : size; 803 } 804 805 /* 806 * A Quirk Mechanism for GPE Flooding Prevention: 807 * 808 * Quirks may be needed to prevent GPE flooding on a specific GPE. The 809 * flooding typically cannot be detected and automatically prevented by 810 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in 811 * the AML tables. This normally indicates a feature gap in Linux, thus 812 * instead of providing endless quirk tables, we provide a boot parameter 813 * for those who want this quirk. For example, if the users want to prevent 814 * the GPE flooding for GPE 00, they need to specify the following boot 815 * parameter: 816 * acpi_mask_gpe=0x00 817 * Note, the parameter can be a list (see bitmap_parselist() for the details). 818 * The masking status can be modified by the following runtime controlling 819 * interface: 820 * echo unmask > /sys/firmware/acpi/interrupts/gpe00 821 */ 822 #define ACPI_MASKABLE_GPE_MAX 0x100 823 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata; 824 825 static int __init acpi_gpe_set_masked_gpes(char *val) 826 { 827 int ret; 828 u8 gpe; 829 830 ret = kstrtou8(val, 0, &gpe); 831 if (ret) { 832 ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX); 833 if (ret) 834 return ret; 835 } else 836 set_bit(gpe, acpi_masked_gpes_map); 837 838 return 1; 839 } 840 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes); 841 842 void __init acpi_gpe_apply_masked_gpes(void) 843 { 844 acpi_handle handle; 845 acpi_status status; 846 u16 gpe; 847 848 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) { 849 status = acpi_get_gpe_device(gpe, &handle); 850 if (ACPI_SUCCESS(status)) { 851 pr_info("Masking GPE 0x%x.\n", gpe); 852 (void)acpi_mask_gpe(handle, gpe, TRUE); 853 } 854 } 855 } 856 857 void acpi_irq_stats_init(void) 858 { 859 acpi_status status; 860 int i; 861 862 if (all_counters) 863 return; 864 865 num_gpes = acpi_current_gpe_count; 866 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA; 867 868 all_attrs = kzalloc_objs(*all_attrs, num_counters + 1); 869 if (all_attrs == NULL) 870 return; 871 872 all_counters = kzalloc_objs(*all_counters, num_counters); 873 if (all_counters == NULL) 874 goto fail; 875 876 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL); 877 if (ACPI_FAILURE(status)) 878 goto fail; 879 880 counter_attrs = kzalloc_objs(*counter_attrs, num_counters); 881 if (counter_attrs == NULL) 882 goto fail; 883 884 for (i = 0; i < num_counters; ++i) { 885 char buffer[12]; 886 char *name; 887 888 if (i < num_gpes) 889 sprintf(buffer, "gpe%02X", i); 890 else if (i == num_gpes + ACPI_EVENT_PMTIMER) 891 sprintf(buffer, "ff_pmtimer"); 892 else if (i == num_gpes + ACPI_EVENT_GLOBAL) 893 sprintf(buffer, "ff_gbl_lock"); 894 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON) 895 sprintf(buffer, "ff_pwr_btn"); 896 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON) 897 sprintf(buffer, "ff_slp_btn"); 898 else if (i == num_gpes + ACPI_EVENT_RTC) 899 sprintf(buffer, "ff_rt_clk"); 900 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE) 901 sprintf(buffer, "gpe_all"); 902 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) 903 sprintf(buffer, "sci"); 904 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT) 905 sprintf(buffer, "sci_not"); 906 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR) 907 sprintf(buffer, "error"); 908 else 909 sprintf(buffer, "bug%02X", i); 910 911 name = kstrdup(buffer, GFP_KERNEL); 912 if (name == NULL) 913 goto fail; 914 915 sysfs_attr_init(&counter_attrs[i].attr); 916 counter_attrs[i].attr.name = name; 917 counter_attrs[i].attr.mode = 0644; 918 counter_attrs[i].show = counter_show; 919 counter_attrs[i].store = counter_set; 920 921 all_attrs[i] = &counter_attrs[i].attr; 922 } 923 924 interrupt_stats_attr_group.attrs = all_attrs; 925 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group)) 926 return; 927 928 fail: 929 delete_gpe_attr_array(); 930 } 931 932 static void __exit interrupt_stats_exit(void) 933 { 934 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group); 935 936 delete_gpe_attr_array(); 937 } 938 939 static ssize_t pm_profile_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 940 { 941 return sysfs_emit(buf, "%d\n", acpi_gbl_FADT.preferred_profile); 942 } 943 944 static const struct kobj_attribute pm_profile_attr = __ATTR_RO(pm_profile); 945 946 static ssize_t enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 947 { 948 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 949 950 return sysfs_emit(buf, "%d\n", hotplug->enabled); 951 } 952 953 static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr, 954 const char *buf, size_t size) 955 { 956 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 957 unsigned int val; 958 959 if (kstrtouint(buf, 10, &val) || val > 1) 960 return -EINVAL; 961 962 acpi_scan_hotplug_enabled(hotplug, val); 963 return size; 964 } 965 966 static struct kobj_attribute hotplug_enabled_attr = __ATTR_RW(enabled); 967 968 static struct attribute *hotplug_profile_attrs[] = { 969 &hotplug_enabled_attr.attr, 970 NULL 971 }; 972 ATTRIBUTE_GROUPS(hotplug_profile); 973 974 static const struct kobj_type acpi_hotplug_profile_ktype = { 975 .sysfs_ops = &kobj_sysfs_ops, 976 .default_groups = hotplug_profile_groups, 977 }; 978 979 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug, 980 const char *name) 981 { 982 int error; 983 984 if (!hotplug_kobj) 985 goto err_out; 986 987 error = kobject_init_and_add(&hotplug->kobj, 988 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name); 989 if (error) { 990 kobject_put(&hotplug->kobj); 991 goto err_out; 992 } 993 994 kobject_uevent(&hotplug->kobj, KOBJ_ADD); 995 return; 996 997 err_out: 998 pr_err("Unable to add hotplug profile '%s'\n", name); 999 } 1000 1001 static ssize_t force_remove_show(struct kobject *kobj, 1002 struct kobj_attribute *attr, char *buf) 1003 { 1004 return sysfs_emit(buf, "%d\n", 0); 1005 } 1006 1007 static ssize_t force_remove_store(struct kobject *kobj, 1008 struct kobj_attribute *attr, 1009 const char *buf, size_t size) 1010 { 1011 bool val; 1012 int ret; 1013 1014 ret = kstrtobool(buf, &val); 1015 if (ret < 0) 1016 return ret; 1017 1018 if (val) { 1019 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n"); 1020 return -EINVAL; 1021 } 1022 return size; 1023 } 1024 1025 static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove); 1026 1027 int __init acpi_sysfs_init(void) 1028 { 1029 int result; 1030 1031 result = acpi_tables_sysfs_init(); 1032 if (result) 1033 return result; 1034 1035 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj); 1036 if (!hotplug_kobj) 1037 return -ENOMEM; 1038 1039 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr); 1040 if (result) 1041 return result; 1042 1043 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr); 1044 return result; 1045 } 1046