1 /* 2 * sysfs.c - ACPI sysfs interface to userspace. 3 */ 4 5 #include <linux/init.h> 6 #include <linux/kernel.h> 7 #include <linux/moduleparam.h> 8 #include <linux/acpi.h> 9 10 #include "internal.h" 11 12 #define _COMPONENT ACPI_SYSTEM_COMPONENT 13 ACPI_MODULE_NAME("sysfs"); 14 15 #ifdef CONFIG_ACPI_DEBUG 16 /* 17 * ACPI debug sysfs I/F, including: 18 * /sys/modules/acpi/parameters/debug_layer 19 * /sys/modules/acpi/parameters/debug_level 20 * /sys/modules/acpi/parameters/trace_method_name 21 * /sys/modules/acpi/parameters/trace_state 22 * /sys/modules/acpi/parameters/trace_debug_layer 23 * /sys/modules/acpi/parameters/trace_debug_level 24 */ 25 26 struct acpi_dlayer { 27 const char *name; 28 unsigned long value; 29 }; 30 struct acpi_dlevel { 31 const char *name; 32 unsigned long value; 33 }; 34 #define ACPI_DEBUG_INIT(v) { .name = #v, .value = v } 35 36 static const struct acpi_dlayer acpi_debug_layers[] = { 37 ACPI_DEBUG_INIT(ACPI_UTILITIES), 38 ACPI_DEBUG_INIT(ACPI_HARDWARE), 39 ACPI_DEBUG_INIT(ACPI_EVENTS), 40 ACPI_DEBUG_INIT(ACPI_TABLES), 41 ACPI_DEBUG_INIT(ACPI_NAMESPACE), 42 ACPI_DEBUG_INIT(ACPI_PARSER), 43 ACPI_DEBUG_INIT(ACPI_DISPATCHER), 44 ACPI_DEBUG_INIT(ACPI_EXECUTER), 45 ACPI_DEBUG_INIT(ACPI_RESOURCES), 46 ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER), 47 ACPI_DEBUG_INIT(ACPI_OS_SERVICES), 48 ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER), 49 ACPI_DEBUG_INIT(ACPI_COMPILER), 50 ACPI_DEBUG_INIT(ACPI_TOOLS), 51 52 ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT), 53 ACPI_DEBUG_INIT(ACPI_AC_COMPONENT), 54 ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT), 55 ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT), 56 ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT), 57 ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT), 58 ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT), 59 ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT), 60 ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT), 61 ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT), 62 ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT), 63 ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT), 64 ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT), 65 ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT), 66 }; 67 68 static const struct acpi_dlevel acpi_debug_levels[] = { 69 ACPI_DEBUG_INIT(ACPI_LV_INIT), 70 ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT), 71 ACPI_DEBUG_INIT(ACPI_LV_INFO), 72 ACPI_DEBUG_INIT(ACPI_LV_REPAIR), 73 ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT), 74 75 ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES), 76 ACPI_DEBUG_INIT(ACPI_LV_PARSE), 77 ACPI_DEBUG_INIT(ACPI_LV_LOAD), 78 ACPI_DEBUG_INIT(ACPI_LV_DISPATCH), 79 ACPI_DEBUG_INIT(ACPI_LV_EXEC), 80 ACPI_DEBUG_INIT(ACPI_LV_NAMES), 81 ACPI_DEBUG_INIT(ACPI_LV_OPREGION), 82 ACPI_DEBUG_INIT(ACPI_LV_BFIELD), 83 ACPI_DEBUG_INIT(ACPI_LV_TABLES), 84 ACPI_DEBUG_INIT(ACPI_LV_VALUES), 85 ACPI_DEBUG_INIT(ACPI_LV_OBJECTS), 86 ACPI_DEBUG_INIT(ACPI_LV_RESOURCES), 87 ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS), 88 ACPI_DEBUG_INIT(ACPI_LV_PACKAGE), 89 90 ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS), 91 ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS), 92 ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS), 93 94 ACPI_DEBUG_INIT(ACPI_LV_MUTEX), 95 ACPI_DEBUG_INIT(ACPI_LV_THREADS), 96 ACPI_DEBUG_INIT(ACPI_LV_IO), 97 ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS), 98 99 ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE), 100 ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO), 101 ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES), 102 ACPI_DEBUG_INIT(ACPI_LV_EVENTS), 103 }; 104 105 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp) 106 { 107 int result = 0; 108 int i; 109 110 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 111 112 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) { 113 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 114 acpi_debug_layers[i].name, 115 acpi_debug_layers[i].value, 116 (acpi_dbg_layer & acpi_debug_layers[i].value) 117 ? '*' : ' '); 118 } 119 result += 120 sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS", 121 ACPI_ALL_DRIVERS, 122 (acpi_dbg_layer & ACPI_ALL_DRIVERS) == 123 ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS) 124 == 0 ? ' ' : '-'); 125 result += 126 sprintf(buffer + result, 127 "--\ndebug_layer = 0x%08X ( * = enabled)\n", 128 acpi_dbg_layer); 129 130 return result; 131 } 132 133 static int param_get_debug_level(char *buffer, const struct kernel_param *kp) 134 { 135 int result = 0; 136 int i; 137 138 result = sprintf(buffer, "%-25s\tHex SET\n", "Description"); 139 140 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) { 141 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n", 142 acpi_debug_levels[i].name, 143 acpi_debug_levels[i].value, 144 (acpi_dbg_level & acpi_debug_levels[i].value) 145 ? '*' : ' '); 146 } 147 result += 148 sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n", 149 acpi_dbg_level); 150 151 return result; 152 } 153 154 static const struct kernel_param_ops param_ops_debug_layer = { 155 .set = param_set_uint, 156 .get = param_get_debug_layer, 157 }; 158 159 static const struct kernel_param_ops param_ops_debug_level = { 160 .set = param_set_uint, 161 .get = param_get_debug_level, 162 }; 163 164 module_param_cb(debug_layer, ¶m_ops_debug_layer, &acpi_dbg_layer, 0644); 165 module_param_cb(debug_level, ¶m_ops_debug_level, &acpi_dbg_level, 0644); 166 167 static char trace_method_name[1024]; 168 169 int param_set_trace_method_name(const char *val, const struct kernel_param *kp) 170 { 171 u32 saved_flags = 0; 172 bool is_abs_path = true; 173 174 if (*val != '\\') 175 is_abs_path = false; 176 177 if ((is_abs_path && strlen(val) > 1023) || 178 (!is_abs_path && strlen(val) > 1022)) { 179 pr_err("%s: string parameter too long\n", kp->name); 180 return -ENOSPC; 181 } 182 183 /* 184 * It's not safe to update acpi_gbl_trace_method_name without 185 * having the tracer stopped, so we save the original tracer 186 * state and disable it. 187 */ 188 saved_flags = acpi_gbl_trace_flags; 189 (void)acpi_debug_trace(NULL, 190 acpi_gbl_trace_dbg_level, 191 acpi_gbl_trace_dbg_layer, 192 0); 193 194 /* This is a hack. We can't kmalloc in early boot. */ 195 if (is_abs_path) 196 strcpy(trace_method_name, val); 197 else { 198 trace_method_name[0] = '\\'; 199 strcpy(trace_method_name+1, val); 200 } 201 202 /* Restore the original tracer state */ 203 (void)acpi_debug_trace(trace_method_name, 204 acpi_gbl_trace_dbg_level, 205 acpi_gbl_trace_dbg_layer, 206 saved_flags); 207 208 return 0; 209 } 210 211 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp) 212 { 213 return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name); 214 } 215 216 static const struct kernel_param_ops param_ops_trace_method = { 217 .set = param_set_trace_method_name, 218 .get = param_get_trace_method_name, 219 }; 220 221 static const struct kernel_param_ops param_ops_trace_attrib = { 222 .set = param_set_uint, 223 .get = param_get_uint, 224 }; 225 226 module_param_cb(trace_method_name, ¶m_ops_trace_method, &trace_method_name, 0644); 227 module_param_cb(trace_debug_layer, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644); 228 module_param_cb(trace_debug_level, ¶m_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644); 229 230 static int param_set_trace_state(const char *val, struct kernel_param *kp) 231 { 232 acpi_status status; 233 const char *method = trace_method_name; 234 u32 flags = 0; 235 236 /* So "xxx-once" comparison should go prior than "xxx" comparison */ 237 #define acpi_compare_param(val, key) \ 238 strncmp((val), (key), sizeof(key) - 1) 239 240 if (!acpi_compare_param(val, "enable")) { 241 method = NULL; 242 flags = ACPI_TRACE_ENABLED; 243 } else if (!acpi_compare_param(val, "disable")) 244 method = NULL; 245 else if (!acpi_compare_param(val, "method-once")) 246 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT; 247 else if (!acpi_compare_param(val, "method")) 248 flags = ACPI_TRACE_ENABLED; 249 else if (!acpi_compare_param(val, "opcode-once")) 250 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE; 251 else if (!acpi_compare_param(val, "opcode")) 252 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE; 253 else 254 return -EINVAL; 255 256 status = acpi_debug_trace(method, 257 acpi_gbl_trace_dbg_level, 258 acpi_gbl_trace_dbg_layer, 259 flags); 260 if (ACPI_FAILURE(status)) 261 return -EBUSY; 262 263 return 0; 264 } 265 266 static int param_get_trace_state(char *buffer, struct kernel_param *kp) 267 { 268 if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED)) 269 return sprintf(buffer, "disable"); 270 else { 271 if (acpi_gbl_trace_method_name) { 272 if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) 273 return sprintf(buffer, "method-once"); 274 else 275 return sprintf(buffer, "method"); 276 } else 277 return sprintf(buffer, "enable"); 278 } 279 return 0; 280 } 281 282 module_param_call(trace_state, param_set_trace_state, param_get_trace_state, 283 NULL, 0644); 284 #endif /* CONFIG_ACPI_DEBUG */ 285 286 287 /* /sys/modules/acpi/parameters/aml_debug_output */ 288 289 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object, 290 byte, 0644); 291 MODULE_PARM_DESC(aml_debug_output, 292 "To enable/disable the ACPI Debug Object output."); 293 294 /* /sys/module/acpi/parameters/acpica_version */ 295 static int param_get_acpica_version(char *buffer, struct kernel_param *kp) 296 { 297 int result; 298 299 result = sprintf(buffer, "%x", ACPI_CA_VERSION); 300 301 return result; 302 } 303 304 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); 305 306 /* 307 * ACPI table sysfs I/F: 308 * /sys/firmware/acpi/tables/ 309 * /sys/firmware/acpi/tables/dynamic/ 310 */ 311 312 static LIST_HEAD(acpi_table_attr_list); 313 static struct kobject *tables_kobj; 314 static struct kobject *dynamic_tables_kobj; 315 static struct kobject *hotplug_kobj; 316 317 #define ACPI_MAX_TABLE_INSTANCES 999 318 #define ACPI_INST_SIZE 4 /* including trailing 0 */ 319 320 struct acpi_table_attr { 321 struct bin_attribute attr; 322 char name[ACPI_NAME_SIZE]; 323 int instance; 324 char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE]; 325 struct list_head node; 326 }; 327 328 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj, 329 struct bin_attribute *bin_attr, char *buf, 330 loff_t offset, size_t count) 331 { 332 struct acpi_table_attr *table_attr = 333 container_of(bin_attr, struct acpi_table_attr, attr); 334 struct acpi_table_header *table_header = NULL; 335 acpi_status status; 336 337 status = acpi_get_table(table_attr->name, table_attr->instance, 338 &table_header); 339 if (ACPI_FAILURE(status)) 340 return -ENODEV; 341 342 return memory_read_from_buffer(buf, count, &offset, 343 table_header, table_header->length); 344 } 345 346 static int acpi_table_attr_init(struct kobject *tables_obj, 347 struct acpi_table_attr *table_attr, 348 struct acpi_table_header *table_header) 349 { 350 struct acpi_table_header *header = NULL; 351 struct acpi_table_attr *attr = NULL; 352 char instance_str[ACPI_INST_SIZE]; 353 354 sysfs_attr_init(&table_attr->attr.attr); 355 ACPI_MOVE_NAME(table_attr->name, table_header->signature); 356 357 list_for_each_entry(attr, &acpi_table_attr_list, node) { 358 if (ACPI_COMPARE_NAME(table_attr->name, attr->name)) 359 if (table_attr->instance < attr->instance) 360 table_attr->instance = attr->instance; 361 } 362 table_attr->instance++; 363 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) { 364 pr_warn("%4.4s: too many table instances\n", 365 table_attr->name); 366 return -ERANGE; 367 } 368 369 ACPI_MOVE_NAME(table_attr->filename, table_header->signature); 370 table_attr->filename[ACPI_NAME_SIZE] = '\0'; 371 if (table_attr->instance > 1 || (table_attr->instance == 1 && 372 !acpi_get_table 373 (table_header->signature, 2, &header))) { 374 snprintf(instance_str, sizeof(instance_str), "%u", 375 table_attr->instance); 376 strcat(table_attr->filename, instance_str); 377 } 378 379 table_attr->attr.size = table_header->length; 380 table_attr->attr.read = acpi_table_show; 381 table_attr->attr.attr.name = table_attr->filename; 382 table_attr->attr.attr.mode = 0400; 383 384 return sysfs_create_bin_file(tables_obj, &table_attr->attr); 385 } 386 387 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context) 388 { 389 struct acpi_table_attr *table_attr; 390 391 switch (event) { 392 case ACPI_TABLE_EVENT_INSTALL: 393 table_attr = 394 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL); 395 if (!table_attr) 396 return AE_NO_MEMORY; 397 398 if (acpi_table_attr_init(dynamic_tables_kobj, 399 table_attr, table)) { 400 kfree(table_attr); 401 return AE_ERROR; 402 } 403 list_add_tail(&table_attr->node, &acpi_table_attr_list); 404 break; 405 case ACPI_TABLE_EVENT_LOAD: 406 case ACPI_TABLE_EVENT_UNLOAD: 407 case ACPI_TABLE_EVENT_UNINSTALL: 408 /* 409 * we do not need to do anything right now 410 * because the table is not deleted from the 411 * global table list when unloading it. 412 */ 413 break; 414 default: 415 return AE_BAD_PARAMETER; 416 } 417 return AE_OK; 418 } 419 420 static int acpi_tables_sysfs_init(void) 421 { 422 struct acpi_table_attr *table_attr; 423 struct acpi_table_header *table_header = NULL; 424 int table_index; 425 acpi_status status; 426 int ret; 427 428 tables_kobj = kobject_create_and_add("tables", acpi_kobj); 429 if (!tables_kobj) 430 goto err; 431 432 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj); 433 if (!dynamic_tables_kobj) 434 goto err_dynamic_tables; 435 436 for (table_index = 0;; table_index++) { 437 status = acpi_get_table_by_index(table_index, &table_header); 438 439 if (status == AE_BAD_PARAMETER) 440 break; 441 442 if (ACPI_FAILURE(status)) 443 continue; 444 445 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL); 446 if (!table_attr) 447 return -ENOMEM; 448 449 ret = acpi_table_attr_init(tables_kobj, 450 table_attr, table_header); 451 if (ret) { 452 kfree(table_attr); 453 return ret; 454 } 455 list_add_tail(&table_attr->node, &acpi_table_attr_list); 456 } 457 458 kobject_uevent(tables_kobj, KOBJ_ADD); 459 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD); 460 461 return 0; 462 err_dynamic_tables: 463 kobject_put(tables_kobj); 464 err: 465 return -ENOMEM; 466 } 467 468 /* 469 * Detailed ACPI IRQ counters: 470 * /sys/firmware/acpi/interrupts/ 471 */ 472 473 u32 acpi_irq_handled; 474 u32 acpi_irq_not_handled; 475 476 #define COUNT_GPE 0 477 #define COUNT_SCI 1 /* acpi_irq_handled */ 478 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */ 479 #define COUNT_ERROR 3 /* other */ 480 #define NUM_COUNTERS_EXTRA 4 481 482 struct event_counter { 483 u32 count; 484 u32 flags; 485 }; 486 487 static struct event_counter *all_counters; 488 static u32 num_gpes; 489 static u32 num_counters; 490 static struct attribute **all_attrs; 491 static u32 acpi_gpe_count; 492 493 static struct attribute_group interrupt_stats_attr_group = { 494 .name = "interrupts", 495 }; 496 497 static struct kobj_attribute *counter_attrs; 498 499 static void delete_gpe_attr_array(void) 500 { 501 struct event_counter *tmp = all_counters; 502 503 all_counters = NULL; 504 kfree(tmp); 505 506 if (counter_attrs) { 507 int i; 508 509 for (i = 0; i < num_gpes; i++) 510 kfree(counter_attrs[i].attr.name); 511 512 kfree(counter_attrs); 513 } 514 kfree(all_attrs); 515 516 return; 517 } 518 519 static void gpe_count(u32 gpe_number) 520 { 521 acpi_gpe_count++; 522 523 if (!all_counters) 524 return; 525 526 if (gpe_number < num_gpes) 527 all_counters[gpe_number].count++; 528 else 529 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 530 COUNT_ERROR].count++; 531 532 return; 533 } 534 535 static void fixed_event_count(u32 event_number) 536 { 537 if (!all_counters) 538 return; 539 540 if (event_number < ACPI_NUM_FIXED_EVENTS) 541 all_counters[num_gpes + event_number].count++; 542 else 543 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 544 COUNT_ERROR].count++; 545 546 return; 547 } 548 549 static void acpi_global_event_handler(u32 event_type, acpi_handle device, 550 u32 event_number, void *context) 551 { 552 if (event_type == ACPI_EVENT_TYPE_GPE) 553 gpe_count(event_number); 554 555 if (event_type == ACPI_EVENT_TYPE_FIXED) 556 fixed_event_count(event_number); 557 } 558 559 static int get_status(u32 index, acpi_event_status *status, 560 acpi_handle *handle) 561 { 562 int result; 563 564 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 565 return -EINVAL; 566 567 if (index < num_gpes) { 568 result = acpi_get_gpe_device(index, handle); 569 if (result) { 570 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND, 571 "Invalid GPE 0x%x", index)); 572 return result; 573 } 574 result = acpi_get_gpe_status(*handle, index, status); 575 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS)) 576 result = acpi_get_event_status(index - num_gpes, status); 577 578 return result; 579 } 580 581 static ssize_t counter_show(struct kobject *kobj, 582 struct kobj_attribute *attr, char *buf) 583 { 584 int index = attr - counter_attrs; 585 int size; 586 acpi_handle handle; 587 acpi_event_status status; 588 int result = 0; 589 590 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count = 591 acpi_irq_handled; 592 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count = 593 acpi_irq_not_handled; 594 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count = 595 acpi_gpe_count; 596 size = sprintf(buf, "%8u", all_counters[index].count); 597 598 /* "gpe_all" or "sci" */ 599 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 600 goto end; 601 602 result = get_status(index, &status, &handle); 603 if (result) 604 goto end; 605 606 if (status & ACPI_EVENT_FLAG_ENABLE_SET) 607 size += sprintf(buf + size, " EN"); 608 else 609 size += sprintf(buf + size, " "); 610 if (status & ACPI_EVENT_FLAG_STATUS_SET) 611 size += sprintf(buf + size, " STS"); 612 else 613 size += sprintf(buf + size, " "); 614 615 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) 616 size += sprintf(buf + size, " invalid "); 617 else if (status & ACPI_EVENT_FLAG_ENABLED) 618 size += sprintf(buf + size, " enabled "); 619 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED) 620 size += sprintf(buf + size, " wake_enabled"); 621 else 622 size += sprintf(buf + size, " disabled "); 623 if (status & ACPI_EVENT_FLAG_MASKED) 624 size += sprintf(buf + size, " masked "); 625 else 626 size += sprintf(buf + size, " unmasked"); 627 628 end: 629 size += sprintf(buf + size, "\n"); 630 return result ? result : size; 631 } 632 633 /* 634 * counter_set() sets the specified counter. 635 * setting the total "sci" file to any value clears all counters. 636 * enable/disable/clear a gpe/fixed event in user space. 637 */ 638 static ssize_t counter_set(struct kobject *kobj, 639 struct kobj_attribute *attr, const char *buf, 640 size_t size) 641 { 642 int index = attr - counter_attrs; 643 acpi_event_status status; 644 acpi_handle handle; 645 int result = 0; 646 unsigned long tmp; 647 648 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) { 649 int i; 650 for (i = 0; i < num_counters; ++i) 651 all_counters[i].count = 0; 652 acpi_gpe_count = 0; 653 acpi_irq_handled = 0; 654 acpi_irq_not_handled = 0; 655 goto end; 656 } 657 658 /* show the event status for both GPEs and Fixed Events */ 659 result = get_status(index, &status, &handle); 660 if (result) 661 goto end; 662 663 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) { 664 printk(KERN_WARNING PREFIX 665 "Can not change Invalid GPE/Fixed Event status\n"); 666 return -EINVAL; 667 } 668 669 if (index < num_gpes) { 670 if (!strcmp(buf, "disable\n") && 671 (status & ACPI_EVENT_FLAG_ENABLED)) 672 result = acpi_disable_gpe(handle, index); 673 else if (!strcmp(buf, "enable\n") && 674 !(status & ACPI_EVENT_FLAG_ENABLED)) 675 result = acpi_enable_gpe(handle, index); 676 else if (!strcmp(buf, "clear\n") && 677 (status & ACPI_EVENT_FLAG_STATUS_SET)) 678 result = acpi_clear_gpe(handle, index); 679 else if (!strcmp(buf, "mask\n")) 680 result = acpi_mask_gpe(handle, index, TRUE); 681 else if (!strcmp(buf, "unmask\n")) 682 result = acpi_mask_gpe(handle, index, FALSE); 683 else if (!kstrtoul(buf, 0, &tmp)) 684 all_counters[index].count = tmp; 685 else 686 result = -EINVAL; 687 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) { 688 int event = index - num_gpes; 689 if (!strcmp(buf, "disable\n") && 690 (status & ACPI_EVENT_FLAG_ENABLE_SET)) 691 result = acpi_disable_event(event, ACPI_NOT_ISR); 692 else if (!strcmp(buf, "enable\n") && 693 !(status & ACPI_EVENT_FLAG_ENABLE_SET)) 694 result = acpi_enable_event(event, ACPI_NOT_ISR); 695 else if (!strcmp(buf, "clear\n") && 696 (status & ACPI_EVENT_FLAG_STATUS_SET)) 697 result = acpi_clear_event(event); 698 else if (!kstrtoul(buf, 0, &tmp)) 699 all_counters[index].count = tmp; 700 else 701 result = -EINVAL; 702 } else 703 all_counters[index].count = strtoul(buf, NULL, 0); 704 705 if (ACPI_FAILURE(result)) 706 result = -EINVAL; 707 end: 708 return result ? result : size; 709 } 710 711 /* 712 * A Quirk Mechanism for GPE Flooding Prevention: 713 * 714 * Quirks may be needed to prevent GPE flooding on a specific GPE. The 715 * flooding typically cannot be detected and automatically prevented by 716 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in 717 * the AML tables. This normally indicates a feature gap in Linux, thus 718 * instead of providing endless quirk tables, we provide a boot parameter 719 * for those who want this quirk. For example, if the users want to prevent 720 * the GPE flooding for GPE 00, they need to specify the following boot 721 * parameter: 722 * acpi_mask_gpe=0x00 723 * The masking status can be modified by the following runtime controlling 724 * interface: 725 * echo unmask > /sys/firmware/acpi/interrupts/gpe00 726 */ 727 728 /* 729 * Currently, the GPE flooding prevention only supports to mask the GPEs 730 * numbered from 00 to 7f. 731 */ 732 #define ACPI_MASKABLE_GPE_MAX 0x80 733 734 static u64 __initdata acpi_masked_gpes; 735 736 static int __init acpi_gpe_set_masked_gpes(char *val) 737 { 738 u8 gpe; 739 740 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX) 741 return -EINVAL; 742 acpi_masked_gpes |= ((u64)1<<gpe); 743 744 return 1; 745 } 746 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes); 747 748 void __init acpi_gpe_apply_masked_gpes(void) 749 { 750 acpi_handle handle; 751 acpi_status status; 752 u8 gpe; 753 754 for (gpe = 0; 755 gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count); 756 gpe++) { 757 if (acpi_masked_gpes & ((u64)1<<gpe)) { 758 status = acpi_get_gpe_device(gpe, &handle); 759 if (ACPI_SUCCESS(status)) { 760 pr_info("Masking GPE 0x%x.\n", gpe); 761 (void)acpi_mask_gpe(handle, gpe, TRUE); 762 } 763 } 764 } 765 } 766 767 void acpi_irq_stats_init(void) 768 { 769 acpi_status status; 770 int i; 771 772 if (all_counters) 773 return; 774 775 num_gpes = acpi_current_gpe_count; 776 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA; 777 778 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1), 779 GFP_KERNEL); 780 if (all_attrs == NULL) 781 return; 782 783 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters), 784 GFP_KERNEL); 785 if (all_counters == NULL) 786 goto fail; 787 788 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL); 789 if (ACPI_FAILURE(status)) 790 goto fail; 791 792 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters), 793 GFP_KERNEL); 794 if (counter_attrs == NULL) 795 goto fail; 796 797 for (i = 0; i < num_counters; ++i) { 798 char buffer[12]; 799 char *name; 800 801 if (i < num_gpes) 802 sprintf(buffer, "gpe%02X", i); 803 else if (i == num_gpes + ACPI_EVENT_PMTIMER) 804 sprintf(buffer, "ff_pmtimer"); 805 else if (i == num_gpes + ACPI_EVENT_GLOBAL) 806 sprintf(buffer, "ff_gbl_lock"); 807 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON) 808 sprintf(buffer, "ff_pwr_btn"); 809 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON) 810 sprintf(buffer, "ff_slp_btn"); 811 else if (i == num_gpes + ACPI_EVENT_RTC) 812 sprintf(buffer, "ff_rt_clk"); 813 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE) 814 sprintf(buffer, "gpe_all"); 815 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) 816 sprintf(buffer, "sci"); 817 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT) 818 sprintf(buffer, "sci_not"); 819 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR) 820 sprintf(buffer, "error"); 821 else 822 sprintf(buffer, "bug%02X", i); 823 824 name = kstrdup(buffer, GFP_KERNEL); 825 if (name == NULL) 826 goto fail; 827 828 sysfs_attr_init(&counter_attrs[i].attr); 829 counter_attrs[i].attr.name = name; 830 counter_attrs[i].attr.mode = 0644; 831 counter_attrs[i].show = counter_show; 832 counter_attrs[i].store = counter_set; 833 834 all_attrs[i] = &counter_attrs[i].attr; 835 } 836 837 interrupt_stats_attr_group.attrs = all_attrs; 838 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group)) 839 return; 840 841 fail: 842 delete_gpe_attr_array(); 843 return; 844 } 845 846 static void __exit interrupt_stats_exit(void) 847 { 848 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group); 849 850 delete_gpe_attr_array(); 851 852 return; 853 } 854 855 static ssize_t 856 acpi_show_profile(struct device *dev, struct device_attribute *attr, 857 char *buf) 858 { 859 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile); 860 } 861 862 static const struct device_attribute pm_profile_attr = 863 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL); 864 865 static ssize_t hotplug_enabled_show(struct kobject *kobj, 866 struct kobj_attribute *attr, char *buf) 867 { 868 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 869 870 return sprintf(buf, "%d\n", hotplug->enabled); 871 } 872 873 static ssize_t hotplug_enabled_store(struct kobject *kobj, 874 struct kobj_attribute *attr, 875 const char *buf, size_t size) 876 { 877 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 878 unsigned int val; 879 880 if (kstrtouint(buf, 10, &val) || val > 1) 881 return -EINVAL; 882 883 acpi_scan_hotplug_enabled(hotplug, val); 884 return size; 885 } 886 887 static struct kobj_attribute hotplug_enabled_attr = 888 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show, 889 hotplug_enabled_store); 890 891 static struct attribute *hotplug_profile_attrs[] = { 892 &hotplug_enabled_attr.attr, 893 NULL 894 }; 895 896 static struct kobj_type acpi_hotplug_profile_ktype = { 897 .sysfs_ops = &kobj_sysfs_ops, 898 .default_attrs = hotplug_profile_attrs, 899 }; 900 901 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug, 902 const char *name) 903 { 904 int error; 905 906 if (!hotplug_kobj) 907 goto err_out; 908 909 error = kobject_init_and_add(&hotplug->kobj, 910 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name); 911 if (error) 912 goto err_out; 913 914 kobject_uevent(&hotplug->kobj, KOBJ_ADD); 915 return; 916 917 err_out: 918 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name); 919 } 920 921 static ssize_t force_remove_show(struct kobject *kobj, 922 struct kobj_attribute *attr, char *buf) 923 { 924 return sprintf(buf, "%d\n", 0); 925 } 926 927 static ssize_t force_remove_store(struct kobject *kobj, 928 struct kobj_attribute *attr, 929 const char *buf, size_t size) 930 { 931 bool val; 932 int ret; 933 934 ret = strtobool(buf, &val); 935 if (ret < 0) 936 return ret; 937 938 if (val) { 939 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n"); 940 return -EINVAL; 941 } 942 return size; 943 } 944 945 static const struct kobj_attribute force_remove_attr = 946 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show, 947 force_remove_store); 948 949 int __init acpi_sysfs_init(void) 950 { 951 int result; 952 953 result = acpi_tables_sysfs_init(); 954 if (result) 955 return result; 956 957 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj); 958 if (!hotplug_kobj) 959 return -ENOMEM; 960 961 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr); 962 if (result) 963 return result; 964 965 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr); 966 return result; 967 } 968