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/init.h> 9 #include <linux/kernel.h> 10 #include <linux/moduleparam.h> 11 #include <linux/acpi.h> 12 13 #include "internal.h" 14 15 #define _COMPONENT ACPI_SYSTEM_COMPONENT 16 ACPI_MODULE_NAME("sysfs"); 17 18 #ifdef CONFIG_ACPI_DEBUG 19 /* 20 * ACPI debug sysfs I/F, including: 21 * /sys/modules/acpi/parameters/debug_layer 22 * /sys/modules/acpi/parameters/debug_level 23 * /sys/modules/acpi/parameters/trace_method_name 24 * /sys/modules/acpi/parameters/trace_state 25 * /sys/modules/acpi/parameters/trace_debug_layer 26 * /sys/modules/acpi/parameters/trace_debug_level 27 */ 28 29 struct acpi_dlayer { 30 const char *name; 31 unsigned long value; 32 }; 33 struct acpi_dlevel { 34 const char *name; 35 unsigned long value; 36 }; 37 #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v } 38 39 static const struct acpi_dlayer acpi_debug_layers[] = { 40 ACPI_DEBUG_INIT(ACPI_UTILITIES), 41 ACPI_DEBUG_INIT(ACPI_HARDWARE), 42 ACPI_DEBUG_INIT(ACPI_EVENTS), 43 ACPI_DEBUG_INIT(ACPI_TABLES), 44 ACPI_DEBUG_INIT(ACPI_NAMESPACE), 45 ACPI_DEBUG_INIT(ACPI_PARSER), 46 ACPI_DEBUG_INIT(ACPI_DISPATCHER), 47 ACPI_DEBUG_INIT(ACPI_EXECUTER), 48 ACPI_DEBUG_INIT(ACPI_RESOURCES), 49 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER), 50 ACPI_DEBUG_INIT(ACPI_OS_SERVICES), 51 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER), 52 ACPI_DEBUG_INIT(ACPI_COMPILER), 53 ACPI_DEBUG_INIT(ACPI_TOOLS), 54 55 ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT), 56 ACPI_DEBUG_INIT(ACPI_AC_COMPONENT), 57 ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT), 58 ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT), 59 ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT), 60 ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT), 61 ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT), 62 ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT), 63 ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT), 64 ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT), 65 ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT), 66 ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT), 67 ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT), 68 ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT), 69 }; 70 71 static const struct acpi_dlevel acpi_debug_levels[] = { 72 ACPI_DEBUG_INIT(ACPI_LV_INIT), 73 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT), 74 ACPI_DEBUG_INIT(ACPI_LV_INFO), 75 ACPI_DEBUG_INIT(ACPI_LV_REPAIR), 76 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT), 77 78 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES), 79 ACPI_DEBUG_INIT(ACPI_LV_PARSE), 80 ACPI_DEBUG_INIT(ACPI_LV_LOAD), 81 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH), 82 ACPI_DEBUG_INIT(ACPI_LV_EXEC), 83 ACPI_DEBUG_INIT(ACPI_LV_NAMES), 84 ACPI_DEBUG_INIT(ACPI_LV_OPREGION), 85 ACPI_DEBUG_INIT(ACPI_LV_BFIELD), 86 ACPI_DEBUG_INIT(ACPI_LV_TABLES), 87 ACPI_DEBUG_INIT(ACPI_LV_VALUES), 88 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS), 89 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES), 90 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS), 91 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE), 92 93 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS), 94 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS), 95 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS), 96 97 ACPI_DEBUG_INIT(ACPI_LV_MUTEX), 98 ACPI_DEBUG_INIT(ACPI_LV_THREADS), 99 ACPI_DEBUG_INIT(ACPI_LV_IO), 100 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS), 101 102 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE), 103 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO), 104 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES), 105 ACPI_DEBUG_INIT(ACPI_LV_EVENTS), 106 }; 107 108 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp) 109 { 110 int result = 0; 111 int i; 112 113 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 114 115 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) { 116 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 117 acpi_debug_layers[i].name, 118 acpi_debug_layers[i].value, 119 (acpi_dbg_layer & acpi_debug_layers[i].value) 120 ? '*' : ' '); 121 } 122 result += 123 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS", 124 ACPI_ALL_DRIVERS, 125 (acpi_dbg_layer & ACPI_ALL_DRIVERS) == 126 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS) 127 == 0 ? ' ' : '-'); 128 result += 129 sprintf(buffer + result, 130 "--\ndebug_layer = 0x%08X ( * = enabled)\n", 131 acpi_dbg_layer); 132 133 return result; 134 } 135 136 static int param_get_debug_level(char *buffer, const struct kernel_param *kp) 137 { 138 int result = 0; 139 int i; 140 141 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 142 143 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) { 144 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 145 acpi_debug_levels[i].name, 146 acpi_debug_levels[i].value, 147 (acpi_dbg_level & acpi_debug_levels[i].value) 148 ? '*' : ' '); 149 } 150 result += 151 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n", 152 acpi_dbg_level); 153 154 return result; 155 } 156 157 static const struct kernel_param_ops param_ops_debug_layer = { 158 .set = param_set_uint, 159 .get = param_get_debug_layer, 160 }; 161 162 static const struct kernel_param_ops param_ops_debug_level = { 163 .set = param_set_uint, 164 .get = param_get_debug_level, 165 }; 166 167 module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644); 168 module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644); 169 170 static char trace_method_name[1024]; 171 172 static int param_set_trace_method_name(const char *val, 173 const struct kernel_param *kp) 174 { 175 u32 saved_flags = 0; 176 bool is_abs_path = true; 177 178 if (*val != '\\') 179 is_abs_path = false; 180 181 if ((is_abs_path && strlen(val) > 1023) || 182 (!is_abs_path && strlen(val) > 1022)) { 183 pr_err("%s: string parameter too long\n", kp->name); 184 return -ENOSPC; 185 } 186 187 /* 188 * It's not safe to update acpi_gbl_trace_method_name without 189 * having the tracer stopped, so we save the original tracer 190 * state and disable it. 191 */ 192 saved_flags = acpi_gbl_trace_flags; 193 (void)acpi_debug_trace(NULL, 194 acpi_gbl_trace_dbg_level, 195 acpi_gbl_trace_dbg_layer, 196 0); 197 198 /* This is a hack. We can't kmalloc in early boot. */ 199 if (is_abs_path) 200 strcpy(trace_method_name, val); 201 else { 202 trace_method_name[0] = '\\'; 203 strcpy(trace_method_name+1, val); 204 } 205 206 /* Restore the original tracer state */ 207 (void)acpi_debug_trace(trace_method_name, 208 acpi_gbl_trace_dbg_level, 209 acpi_gbl_trace_dbg_layer, 210 saved_flags); 211 212 return 0; 213 } 214 215 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp) 216 { 217 return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name); 218 } 219 220 static const struct kernel_param_ops param_ops_trace_method = { 221 .set = param_set_trace_method_name, 222 .get = param_get_trace_method_name, 223 }; 224 225 static const struct kernel_param_ops param_ops_trace_attrib = { 226 .set = param_set_uint, 227 .get = param_get_uint, 228 }; 229 230 module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644); 231 module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644); 232 module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644); 233 234 static int param_set_trace_state(const char *val, 235 const struct kernel_param *kp) 236 { 237 acpi_status status; 238 const char *method = trace_method_name; 239 u32 flags = 0; 240 241 /* So "xxx-once" comparison should go prior than "xxx" comparison */ 242 #define acpi_compare_param(val, key) \ 243 strncmp((val), (key), sizeof(key) - 1) 244 245 if (!acpi_compare_param(val, "enable")) { 246 method = NULL; 247 flags = ACPI_TRACE_ENABLED; 248 } else if (!acpi_compare_param(val, "disable")) 249 method = NULL; 250 else if (!acpi_compare_param(val, "method-once")) 251 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT; 252 else if (!acpi_compare_param(val, "method")) 253 flags = ACPI_TRACE_ENABLED; 254 else if (!acpi_compare_param(val, "opcode-once")) 255 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE; 256 else if (!acpi_compare_param(val, "opcode")) 257 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE; 258 else 259 return -EINVAL; 260 261 status = acpi_debug_trace(method, 262 acpi_gbl_trace_dbg_level, 263 acpi_gbl_trace_dbg_layer, 264 flags); 265 if (ACPI_FAILURE(status)) 266 return -EBUSY; 267 268 return 0; 269 } 270 271 static int param_get_trace_state(char *buffer, const struct kernel_param *kp) 272 { 273 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED)) 274 return sprintf(buffer, "disable"); 275 else { 276 if (acpi_gbl_trace_method_name) { 277 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) 278 return sprintf(buffer, "method-once"); 279 else 280 return sprintf(buffer, "method"); 281 } else 282 return sprintf(buffer, "enable"); 283 } 284 return 0; 285 } 286 287 module_param_call(trace_state, param_set_trace_state, param_get_trace_state, 288 NULL, 0644); 289 #endif /* CONFIG_ACPI_DEBUG */ 290 291 292 /* /sys/modules/acpi/parameters/aml_debug_output */ 293 294 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object, 295 byte, 0644); 296 MODULE_PARM_DESC(aml_debug_output, 297 "To enable/disable the ACPI Debug Object output."); 298 299 /* /sys/module/acpi/parameters/acpica_version */ 300 static int param_get_acpica_version(char *buffer, 301 const struct kernel_param *kp) 302 { 303 int result; 304 305 result = sprintf(buffer, "%x", ACPI_CA_VERSION); 306 307 return result; 308 } 309 310 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); 311 312 /* 313 * ACPI table sysfs I/F: 314 * /sys/firmware/acpi/tables/ 315 * /sys/firmware/acpi/tables/data/ 316 * /sys/firmware/acpi/tables/dynamic/ 317 */ 318 319 static LIST_HEAD(acpi_table_attr_list); 320 static struct kobject *tables_kobj; 321 static struct kobject *tables_data_kobj; 322 static struct kobject *dynamic_tables_kobj; 323 static struct kobject *hotplug_kobj; 324 325 #define ACPI_MAX_TABLE_INSTANCES 999 326 #define ACPI_INST_SIZE 4 /* including trailing 0 */ 327 328 struct acpi_table_attr { 329 struct bin_attribute attr; 330 char name[ACPI_NAMESEG_SIZE]; 331 int instance; 332 char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE]; 333 struct list_head node; 334 }; 335 336 struct acpi_data_attr { 337 struct bin_attribute attr; 338 u64 addr; 339 }; 340 341 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj, 342 struct bin_attribute *bin_attr, char *buf, 343 loff_t offset, size_t count) 344 { 345 struct acpi_table_attr *table_attr = 346 container_of(bin_attr, struct acpi_table_attr, attr); 347 struct acpi_table_header *table_header = NULL; 348 acpi_status status; 349 ssize_t rc; 350 351 status = acpi_get_table(table_attr->name, table_attr->instance, 352 &table_header); 353 if (ACPI_FAILURE(status)) 354 return -ENODEV; 355 356 rc = memory_read_from_buffer(buf, count, &offset, table_header, 357 table_header->length); 358 acpi_put_table(table_header); 359 return rc; 360 } 361 362 static int acpi_table_attr_init(struct kobject *tables_obj, 363 struct acpi_table_attr *table_attr, 364 struct acpi_table_header *table_header) 365 { 366 struct acpi_table_header *header = NULL; 367 struct acpi_table_attr *attr = NULL; 368 char instance_str[ACPI_INST_SIZE]; 369 370 sysfs_attr_init(&table_attr->attr.attr); 371 ACPI_COPY_NAMESEG(table_attr->name, table_header->signature); 372 373 list_for_each_entry(attr, &acpi_table_attr_list, node) { 374 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name)) 375 if (table_attr->instance < attr->instance) 376 table_attr->instance = attr->instance; 377 } 378 table_attr->instance++; 379 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) { 380 pr_warn("%4.4s: too many table instances\n", 381 table_attr->name); 382 return -ERANGE; 383 } 384 385 ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature); 386 table_attr->filename[ACPI_NAMESEG_SIZE] = '\0'; 387 if (table_attr->instance > 1 || (table_attr->instance == 1 && 388 !acpi_get_table 389 (table_header->signature, 2, &header))) { 390 snprintf(instance_str, sizeof(instance_str), "%u", 391 table_attr->instance); 392 strcat(table_attr->filename, instance_str); 393 } 394 395 table_attr->attr.size = table_header->length; 396 table_attr->attr.read = acpi_table_show; 397 table_attr->attr.attr.name = table_attr->filename; 398 table_attr->attr.attr.mode = 0400; 399 400 return sysfs_create_bin_file(tables_obj, &table_attr->attr); 401 } 402 403 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context) 404 { 405 struct acpi_table_attr *table_attr; 406 407 switch (event) { 408 case ACPI_TABLE_EVENT_INSTALL: 409 table_attr = 410 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL); 411 if (!table_attr) 412 return AE_NO_MEMORY; 413 414 if (acpi_table_attr_init(dynamic_tables_kobj, 415 table_attr, table)) { 416 kfree(table_attr); 417 return AE_ERROR; 418 } 419 list_add_tail(&table_attr->node, &acpi_table_attr_list); 420 break; 421 case ACPI_TABLE_EVENT_LOAD: 422 case ACPI_TABLE_EVENT_UNLOAD: 423 case ACPI_TABLE_EVENT_UNINSTALL: 424 /* 425 * we do not need to do anything right now 426 * because the table is not deleted from the 427 * global table list when unloading it. 428 */ 429 break; 430 default: 431 return AE_BAD_PARAMETER; 432 } 433 return AE_OK; 434 } 435 436 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj, 437 struct bin_attribute *bin_attr, char *buf, 438 loff_t offset, size_t count) 439 { 440 struct acpi_data_attr *data_attr; 441 void __iomem *base; 442 ssize_t rc; 443 444 data_attr = container_of(bin_attr, struct acpi_data_attr, attr); 445 446 base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size); 447 if (!base) 448 return -ENOMEM; 449 rc = memory_read_from_buffer(buf, count, &offset, base, 450 data_attr->attr.size); 451 acpi_os_unmap_memory(base, data_attr->attr.size); 452 453 return rc; 454 } 455 456 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr) 457 { 458 struct acpi_table_bert *bert = th; 459 460 if (bert->header.length < sizeof(struct acpi_table_bert) || 461 bert->region_length < sizeof(struct acpi_hest_generic_status)) { 462 kfree(data_attr); 463 return -EINVAL; 464 } 465 data_attr->addr = bert->address; 466 data_attr->attr.size = bert->region_length; 467 data_attr->attr.attr.name = "BERT"; 468 469 return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr); 470 } 471 472 static struct acpi_data_obj { 473 char *name; 474 int (*fn)(void *, struct acpi_data_attr *); 475 } acpi_data_objs[] = { 476 { ACPI_SIG_BERT, acpi_bert_data_init }, 477 }; 478 479 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs) 480 481 static int acpi_table_data_init(struct acpi_table_header *th) 482 { 483 struct acpi_data_attr *data_attr; 484 int i; 485 486 for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) { 487 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) { 488 data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL); 489 if (!data_attr) 490 return -ENOMEM; 491 sysfs_attr_init(&data_attr->attr.attr); 492 data_attr->attr.read = acpi_data_show; 493 data_attr->attr.attr.mode = 0400; 494 return acpi_data_objs[i].fn(th, data_attr); 495 } 496 } 497 return 0; 498 } 499 500 static int acpi_tables_sysfs_init(void) 501 { 502 struct acpi_table_attr *table_attr; 503 struct acpi_table_header *table_header = NULL; 504 int table_index; 505 acpi_status status; 506 int ret; 507 508 tables_kobj = kobject_create_and_add("tables", acpi_kobj); 509 if (!tables_kobj) 510 goto err; 511 512 tables_data_kobj = kobject_create_and_add("data", tables_kobj); 513 if (!tables_data_kobj) 514 goto err_tables_data; 515 516 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj); 517 if (!dynamic_tables_kobj) 518 goto err_dynamic_tables; 519 520 for (table_index = 0;; table_index++) { 521 status = acpi_get_table_by_index(table_index, &table_header); 522 523 if (status == AE_BAD_PARAMETER) 524 break; 525 526 if (ACPI_FAILURE(status)) 527 continue; 528 529 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL); 530 if (!table_attr) 531 return -ENOMEM; 532 533 ret = acpi_table_attr_init(tables_kobj, 534 table_attr, table_header); 535 if (ret) { 536 kfree(table_attr); 537 return ret; 538 } 539 list_add_tail(&table_attr->node, &acpi_table_attr_list); 540 acpi_table_data_init(table_header); 541 } 542 543 kobject_uevent(tables_kobj, KOBJ_ADD); 544 kobject_uevent(tables_data_kobj, KOBJ_ADD); 545 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD); 546 547 return 0; 548 err_dynamic_tables: 549 kobject_put(tables_data_kobj); 550 err_tables_data: 551 kobject_put(tables_kobj); 552 err: 553 return -ENOMEM; 554 } 555 556 /* 557 * Detailed ACPI IRQ counters: 558 * /sys/firmware/acpi/interrupts/ 559 */ 560 561 u32 acpi_irq_handled; 562 u32 acpi_irq_not_handled; 563 564 #define COUNT_GPE 0 565 #define COUNT_SCI 1 /* acpi_irq_handled */ 566 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */ 567 #define COUNT_ERROR 3 /* other */ 568 #define NUM_COUNTERS_EXTRA 4 569 570 struct event_counter { 571 u32 count; 572 u32 flags; 573 }; 574 575 static struct event_counter *all_counters; 576 static u32 num_gpes; 577 static u32 num_counters; 578 static struct attribute **all_attrs; 579 static u32 acpi_gpe_count; 580 581 static struct attribute_group interrupt_stats_attr_group = { 582 .name = "interrupts", 583 }; 584 585 static struct kobj_attribute *counter_attrs; 586 587 static void delete_gpe_attr_array(void) 588 { 589 struct event_counter *tmp = all_counters; 590 591 all_counters = NULL; 592 kfree(tmp); 593 594 if (counter_attrs) { 595 int i; 596 597 for (i = 0; i < num_gpes; i++) 598 kfree(counter_attrs[i].attr.name); 599 600 kfree(counter_attrs); 601 } 602 kfree(all_attrs); 603 604 return; 605 } 606 607 static void gpe_count(u32 gpe_number) 608 { 609 acpi_gpe_count++; 610 611 if (!all_counters) 612 return; 613 614 if (gpe_number < num_gpes) 615 all_counters[gpe_number].count++; 616 else 617 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 618 COUNT_ERROR].count++; 619 620 return; 621 } 622 623 static void fixed_event_count(u32 event_number) 624 { 625 if (!all_counters) 626 return; 627 628 if (event_number < ACPI_NUM_FIXED_EVENTS) 629 all_counters[num_gpes + event_number].count++; 630 else 631 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 632 COUNT_ERROR].count++; 633 634 return; 635 } 636 637 static void acpi_global_event_handler(u32 event_type, acpi_handle device, 638 u32 event_number, void *context) 639 { 640 if (event_type == ACPI_EVENT_TYPE_GPE) { 641 gpe_count(event_number); 642 pr_debug("GPE event 0x%02x\n", event_number); 643 } else if (event_type == ACPI_EVENT_TYPE_FIXED) { 644 fixed_event_count(event_number); 645 pr_debug("Fixed event 0x%02x\n", event_number); 646 } else { 647 pr_debug("Other event 0x%02x\n", event_number); 648 } 649 } 650 651 static int get_status(u32 index, acpi_event_status *ret, 652 acpi_handle *handle) 653 { 654 acpi_status status; 655 656 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 657 return -EINVAL; 658 659 if (index < num_gpes) { 660 status = acpi_get_gpe_device(index, handle); 661 if (ACPI_FAILURE(status)) { 662 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND, 663 "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 = sprintf(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 += sprintf(buf + size, " EN"); 703 else 704 size += sprintf(buf + size, " "); 705 if (status & ACPI_EVENT_FLAG_STATUS_SET) 706 size += sprintf(buf + size, " STS"); 707 else 708 size += sprintf(buf + size, " "); 709 710 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) 711 size += sprintf(buf + size, " invalid "); 712 else if (status & ACPI_EVENT_FLAG_ENABLED) 713 size += sprintf(buf + size, " enabled "); 714 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED) 715 size += sprintf(buf + size, " wake_enabled"); 716 else 717 size += sprintf(buf + size, " disabled "); 718 if (status & ACPI_EVENT_FLAG_MASKED) 719 size += sprintf(buf + size, " masked "); 720 else 721 size += sprintf(buf + size, " unmasked"); 722 723 end: 724 size += sprintf(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 printk(KERN_WARNING PREFIX 760 "Can not change Invalid GPE/Fixed Event status\n"); 761 return -EINVAL; 762 } 763 764 if (index < num_gpes) { 765 if (!strcmp(buf, "disable\n") && 766 (status & ACPI_EVENT_FLAG_ENABLED)) 767 result = acpi_disable_gpe(handle, index); 768 else if (!strcmp(buf, "enable\n") && 769 !(status & ACPI_EVENT_FLAG_ENABLED)) 770 result = acpi_enable_gpe(handle, index); 771 else if (!strcmp(buf, "clear\n") && 772 (status & ACPI_EVENT_FLAG_STATUS_SET)) 773 result = acpi_clear_gpe(handle, index); 774 else if (!strcmp(buf, "mask\n")) 775 result = acpi_mask_gpe(handle, index, TRUE); 776 else if (!strcmp(buf, "unmask\n")) 777 result = acpi_mask_gpe(handle, index, FALSE); 778 else if (!kstrtoul(buf, 0, &tmp)) 779 all_counters[index].count = tmp; 780 else 781 result = -EINVAL; 782 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) { 783 int event = index - num_gpes; 784 if (!strcmp(buf, "disable\n") && 785 (status & ACPI_EVENT_FLAG_ENABLE_SET)) 786 result = acpi_disable_event(event, ACPI_NOT_ISR); 787 else if (!strcmp(buf, "enable\n") && 788 !(status & ACPI_EVENT_FLAG_ENABLE_SET)) 789 result = acpi_enable_event(event, ACPI_NOT_ISR); 790 else if (!strcmp(buf, "clear\n") && 791 (status & ACPI_EVENT_FLAG_STATUS_SET)) 792 result = acpi_clear_event(event); 793 else if (!kstrtoul(buf, 0, &tmp)) 794 all_counters[index].count = tmp; 795 else 796 result = -EINVAL; 797 } else 798 all_counters[index].count = strtoul(buf, NULL, 0); 799 800 if (ACPI_FAILURE(result)) 801 result = -EINVAL; 802 end: 803 return result ? result : size; 804 } 805 806 /* 807 * A Quirk Mechanism for GPE Flooding Prevention: 808 * 809 * Quirks may be needed to prevent GPE flooding on a specific GPE. The 810 * flooding typically cannot be detected and automatically prevented by 811 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in 812 * the AML tables. This normally indicates a feature gap in Linux, thus 813 * instead of providing endless quirk tables, we provide a boot parameter 814 * for those who want this quirk. For example, if the users want to prevent 815 * the GPE flooding for GPE 00, they need to specify the following boot 816 * parameter: 817 * acpi_mask_gpe=0x00 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 0xFF 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 u8 gpe; 828 829 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX) 830 return -EINVAL; 831 set_bit(gpe, acpi_masked_gpes_map); 832 833 return 1; 834 } 835 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes); 836 837 void __init acpi_gpe_apply_masked_gpes(void) 838 { 839 acpi_handle handle; 840 acpi_status status; 841 u8 gpe; 842 843 for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) { 844 status = acpi_get_gpe_device(gpe, &handle); 845 if (ACPI_SUCCESS(status)) { 846 pr_info("Masking GPE 0x%x.\n", gpe); 847 (void)acpi_mask_gpe(handle, gpe, TRUE); 848 } 849 } 850 } 851 852 void acpi_irq_stats_init(void) 853 { 854 acpi_status status; 855 int i; 856 857 if (all_counters) 858 return; 859 860 num_gpes = acpi_current_gpe_count; 861 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA; 862 863 all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *), 864 GFP_KERNEL); 865 if (all_attrs == NULL) 866 return; 867 868 all_counters = kcalloc(num_counters, sizeof(struct event_counter), 869 GFP_KERNEL); 870 if (all_counters == NULL) 871 goto fail; 872 873 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL); 874 if (ACPI_FAILURE(status)) 875 goto fail; 876 877 counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute), 878 GFP_KERNEL); 879 if (counter_attrs == NULL) 880 goto fail; 881 882 for (i = 0; i < num_counters; ++i) { 883 char buffer[12]; 884 char *name; 885 886 if (i < num_gpes) 887 sprintf(buffer, "gpe%02X", i); 888 else if (i == num_gpes + ACPI_EVENT_PMTIMER) 889 sprintf(buffer, "ff_pmtimer"); 890 else if (i == num_gpes + ACPI_EVENT_GLOBAL) 891 sprintf(buffer, "ff_gbl_lock"); 892 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON) 893 sprintf(buffer, "ff_pwr_btn"); 894 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON) 895 sprintf(buffer, "ff_slp_btn"); 896 else if (i == num_gpes + ACPI_EVENT_RTC) 897 sprintf(buffer, "ff_rt_clk"); 898 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE) 899 sprintf(buffer, "gpe_all"); 900 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) 901 sprintf(buffer, "sci"); 902 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT) 903 sprintf(buffer, "sci_not"); 904 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR) 905 sprintf(buffer, "error"); 906 else 907 sprintf(buffer, "bug%02X", i); 908 909 name = kstrdup(buffer, GFP_KERNEL); 910 if (name == NULL) 911 goto fail; 912 913 sysfs_attr_init(&counter_attrs[i].attr); 914 counter_attrs[i].attr.name = name; 915 counter_attrs[i].attr.mode = 0644; 916 counter_attrs[i].show = counter_show; 917 counter_attrs[i].store = counter_set; 918 919 all_attrs[i] = &counter_attrs[i].attr; 920 } 921 922 interrupt_stats_attr_group.attrs = all_attrs; 923 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group)) 924 return; 925 926 fail: 927 delete_gpe_attr_array(); 928 return; 929 } 930 931 static void __exit interrupt_stats_exit(void) 932 { 933 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group); 934 935 delete_gpe_attr_array(); 936 937 return; 938 } 939 940 static ssize_t 941 acpi_show_profile(struct device *dev, struct device_attribute *attr, 942 char *buf) 943 { 944 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile); 945 } 946 947 static const struct device_attribute pm_profile_attr = 948 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL); 949 950 static ssize_t hotplug_enabled_show(struct kobject *kobj, 951 struct kobj_attribute *attr, char *buf) 952 { 953 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 954 955 return sprintf(buf, "%d\n", hotplug->enabled); 956 } 957 958 static ssize_t hotplug_enabled_store(struct kobject *kobj, 959 struct kobj_attribute *attr, 960 const char *buf, size_t size) 961 { 962 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 963 unsigned int val; 964 965 if (kstrtouint(buf, 10, &val) || val > 1) 966 return -EINVAL; 967 968 acpi_scan_hotplug_enabled(hotplug, val); 969 return size; 970 } 971 972 static struct kobj_attribute hotplug_enabled_attr = 973 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show, 974 hotplug_enabled_store); 975 976 static struct attribute *hotplug_profile_attrs[] = { 977 &hotplug_enabled_attr.attr, 978 NULL 979 }; 980 981 static struct kobj_type acpi_hotplug_profile_ktype = { 982 .sysfs_ops = &kobj_sysfs_ops, 983 .default_attrs = hotplug_profile_attrs, 984 }; 985 986 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug, 987 const char *name) 988 { 989 int error; 990 991 if (!hotplug_kobj) 992 goto err_out; 993 994 error = kobject_init_and_add(&hotplug->kobj, 995 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name); 996 if (error) 997 goto err_out; 998 999 kobject_uevent(&hotplug->kobj, KOBJ_ADD); 1000 return; 1001 1002 err_out: 1003 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name); 1004 } 1005 1006 static ssize_t force_remove_show(struct kobject *kobj, 1007 struct kobj_attribute *attr, char *buf) 1008 { 1009 return sprintf(buf, "%d\n", 0); 1010 } 1011 1012 static ssize_t force_remove_store(struct kobject *kobj, 1013 struct kobj_attribute *attr, 1014 const char *buf, size_t size) 1015 { 1016 bool val; 1017 int ret; 1018 1019 ret = strtobool(buf, &val); 1020 if (ret < 0) 1021 return ret; 1022 1023 if (val) { 1024 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n"); 1025 return -EINVAL; 1026 } 1027 return size; 1028 } 1029 1030 static const struct kobj_attribute force_remove_attr = 1031 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show, 1032 force_remove_store); 1033 1034 int __init acpi_sysfs_init(void) 1035 { 1036 int result; 1037 1038 result = acpi_tables_sysfs_init(); 1039 if (result) 1040 return result; 1041 1042 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj); 1043 if (!hotplug_kobj) 1044 return -ENOMEM; 1045 1046 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr); 1047 if (result) 1048 return result; 1049 1050 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr); 1051 return result; 1052 } 1053