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 ssize_t rc; 337 338 status = acpi_get_table(table_attr->name, table_attr->instance, 339 &table_header); 340 if (ACPI_FAILURE(status)) 341 return -ENODEV; 342 343 rc = memory_read_from_buffer(buf, count, &offset, table_header, 344 table_header->length); 345 acpi_put_table(table_header); 346 return rc; 347 } 348 349 static int acpi_table_attr_init(struct kobject *tables_obj, 350 struct acpi_table_attr *table_attr, 351 struct acpi_table_header *table_header) 352 { 353 struct acpi_table_header *header = NULL; 354 struct acpi_table_attr *attr = NULL; 355 char instance_str[ACPI_INST_SIZE]; 356 357 sysfs_attr_init(&table_attr->attr.attr); 358 ACPI_MOVE_NAME(table_attr->name, table_header->signature); 359 360 list_for_each_entry(attr, &acpi_table_attr_list, node) { 361 if (ACPI_COMPARE_NAME(table_attr->name, attr->name)) 362 if (table_attr->instance < attr->instance) 363 table_attr->instance = attr->instance; 364 } 365 table_attr->instance++; 366 if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) { 367 pr_warn("%4.4s: too many table instances\n", 368 table_attr->name); 369 return -ERANGE; 370 } 371 372 ACPI_MOVE_NAME(table_attr->filename, table_header->signature); 373 table_attr->filename[ACPI_NAME_SIZE] = '\0'; 374 if (table_attr->instance > 1 || (table_attr->instance == 1 && 375 !acpi_get_table 376 (table_header->signature, 2, &header))) { 377 snprintf(instance_str, sizeof(instance_str), "%u", 378 table_attr->instance); 379 strcat(table_attr->filename, instance_str); 380 } 381 382 table_attr->attr.size = table_header->length; 383 table_attr->attr.read = acpi_table_show; 384 table_attr->attr.attr.name = table_attr->filename; 385 table_attr->attr.attr.mode = 0400; 386 387 return sysfs_create_bin_file(tables_obj, &table_attr->attr); 388 } 389 390 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context) 391 { 392 struct acpi_table_attr *table_attr; 393 394 switch (event) { 395 case ACPI_TABLE_EVENT_INSTALL: 396 table_attr = 397 kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL); 398 if (!table_attr) 399 return AE_NO_MEMORY; 400 401 if (acpi_table_attr_init(dynamic_tables_kobj, 402 table_attr, table)) { 403 kfree(table_attr); 404 return AE_ERROR; 405 } 406 list_add_tail(&table_attr->node, &acpi_table_attr_list); 407 break; 408 case ACPI_TABLE_EVENT_LOAD: 409 case ACPI_TABLE_EVENT_UNLOAD: 410 case ACPI_TABLE_EVENT_UNINSTALL: 411 /* 412 * we do not need to do anything right now 413 * because the table is not deleted from the 414 * global table list when unloading it. 415 */ 416 break; 417 default: 418 return AE_BAD_PARAMETER; 419 } 420 return AE_OK; 421 } 422 423 static int acpi_tables_sysfs_init(void) 424 { 425 struct acpi_table_attr *table_attr; 426 struct acpi_table_header *table_header = NULL; 427 int table_index; 428 acpi_status status; 429 int ret; 430 431 tables_kobj = kobject_create_and_add("tables", acpi_kobj); 432 if (!tables_kobj) 433 goto err; 434 435 dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj); 436 if (!dynamic_tables_kobj) 437 goto err_dynamic_tables; 438 439 for (table_index = 0;; table_index++) { 440 status = acpi_get_table_by_index(table_index, &table_header); 441 442 if (status == AE_BAD_PARAMETER) 443 break; 444 445 if (ACPI_FAILURE(status)) 446 continue; 447 448 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL); 449 if (!table_attr) 450 return -ENOMEM; 451 452 ret = acpi_table_attr_init(tables_kobj, 453 table_attr, table_header); 454 if (ret) { 455 kfree(table_attr); 456 return ret; 457 } 458 list_add_tail(&table_attr->node, &acpi_table_attr_list); 459 } 460 461 kobject_uevent(tables_kobj, KOBJ_ADD); 462 kobject_uevent(dynamic_tables_kobj, KOBJ_ADD); 463 464 return 0; 465 err_dynamic_tables: 466 kobject_put(tables_kobj); 467 err: 468 return -ENOMEM; 469 } 470 471 /* 472 * Detailed ACPI IRQ counters: 473 * /sys/firmware/acpi/interrupts/ 474 */ 475 476 u32 acpi_irq_handled; 477 u32 acpi_irq_not_handled; 478 479 #define COUNT_GPE 0 480 #define COUNT_SCI 1 /* acpi_irq_handled */ 481 #define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */ 482 #define COUNT_ERROR 3 /* other */ 483 #define NUM_COUNTERS_EXTRA 4 484 485 struct event_counter { 486 u32 count; 487 u32 flags; 488 }; 489 490 static struct event_counter *all_counters; 491 static u32 num_gpes; 492 static u32 num_counters; 493 static struct attribute **all_attrs; 494 static u32 acpi_gpe_count; 495 496 static struct attribute_group interrupt_stats_attr_group = { 497 .name = "interrupts", 498 }; 499 500 static struct kobj_attribute *counter_attrs; 501 502 static void delete_gpe_attr_array(void) 503 { 504 struct event_counter *tmp = all_counters; 505 506 all_counters = NULL; 507 kfree(tmp); 508 509 if (counter_attrs) { 510 int i; 511 512 for (i = 0; i < num_gpes; i++) 513 kfree(counter_attrs[i].attr.name); 514 515 kfree(counter_attrs); 516 } 517 kfree(all_attrs); 518 519 return; 520 } 521 522 static void gpe_count(u32 gpe_number) 523 { 524 acpi_gpe_count++; 525 526 if (!all_counters) 527 return; 528 529 if (gpe_number < num_gpes) 530 all_counters[gpe_number].count++; 531 else 532 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 533 COUNT_ERROR].count++; 534 535 return; 536 } 537 538 static void fixed_event_count(u32 event_number) 539 { 540 if (!all_counters) 541 return; 542 543 if (event_number < ACPI_NUM_FIXED_EVENTS) 544 all_counters[num_gpes + event_number].count++; 545 else 546 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + 547 COUNT_ERROR].count++; 548 549 return; 550 } 551 552 static void acpi_global_event_handler(u32 event_type, acpi_handle device, 553 u32 event_number, void *context) 554 { 555 if (event_type == ACPI_EVENT_TYPE_GPE) 556 gpe_count(event_number); 557 558 if (event_type == ACPI_EVENT_TYPE_FIXED) 559 fixed_event_count(event_number); 560 } 561 562 static int get_status(u32 index, acpi_event_status *status, 563 acpi_handle *handle) 564 { 565 int result; 566 567 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 568 return -EINVAL; 569 570 if (index < num_gpes) { 571 result = acpi_get_gpe_device(index, handle); 572 if (result) { 573 ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND, 574 "Invalid GPE 0x%x", index)); 575 return result; 576 } 577 result = acpi_get_gpe_status(*handle, index, status); 578 } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS)) 579 result = acpi_get_event_status(index - num_gpes, status); 580 581 return result; 582 } 583 584 static ssize_t counter_show(struct kobject *kobj, 585 struct kobj_attribute *attr, char *buf) 586 { 587 int index = attr - counter_attrs; 588 int size; 589 acpi_handle handle; 590 acpi_event_status status; 591 int result = 0; 592 593 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count = 594 acpi_irq_handled; 595 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count = 596 acpi_irq_not_handled; 597 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count = 598 acpi_gpe_count; 599 size = sprintf(buf, "%8u", all_counters[index].count); 600 601 /* "gpe_all" or "sci" */ 602 if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS) 603 goto end; 604 605 result = get_status(index, &status, &handle); 606 if (result) 607 goto end; 608 609 if (status & ACPI_EVENT_FLAG_ENABLE_SET) 610 size += sprintf(buf + size, " EN"); 611 else 612 size += sprintf(buf + size, " "); 613 if (status & ACPI_EVENT_FLAG_STATUS_SET) 614 size += sprintf(buf + size, " STS"); 615 else 616 size += sprintf(buf + size, " "); 617 618 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) 619 size += sprintf(buf + size, " invalid "); 620 else if (status & ACPI_EVENT_FLAG_ENABLED) 621 size += sprintf(buf + size, " enabled "); 622 else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED) 623 size += sprintf(buf + size, " wake_enabled"); 624 else 625 size += sprintf(buf + size, " disabled "); 626 if (status & ACPI_EVENT_FLAG_MASKED) 627 size += sprintf(buf + size, " masked "); 628 else 629 size += sprintf(buf + size, " unmasked"); 630 631 end: 632 size += sprintf(buf + size, "\n"); 633 return result ? result : size; 634 } 635 636 /* 637 * counter_set() sets the specified counter. 638 * setting the total "sci" file to any value clears all counters. 639 * enable/disable/clear a gpe/fixed event in user space. 640 */ 641 static ssize_t counter_set(struct kobject *kobj, 642 struct kobj_attribute *attr, const char *buf, 643 size_t size) 644 { 645 int index = attr - counter_attrs; 646 acpi_event_status status; 647 acpi_handle handle; 648 int result = 0; 649 unsigned long tmp; 650 651 if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) { 652 int i; 653 for (i = 0; i < num_counters; ++i) 654 all_counters[i].count = 0; 655 acpi_gpe_count = 0; 656 acpi_irq_handled = 0; 657 acpi_irq_not_handled = 0; 658 goto end; 659 } 660 661 /* show the event status for both GPEs and Fixed Events */ 662 result = get_status(index, &status, &handle); 663 if (result) 664 goto end; 665 666 if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) { 667 printk(KERN_WARNING PREFIX 668 "Can not change Invalid GPE/Fixed Event status\n"); 669 return -EINVAL; 670 } 671 672 if (index < num_gpes) { 673 if (!strcmp(buf, "disable\n") && 674 (status & ACPI_EVENT_FLAG_ENABLED)) 675 result = acpi_disable_gpe(handle, index); 676 else if (!strcmp(buf, "enable\n") && 677 !(status & ACPI_EVENT_FLAG_ENABLED)) 678 result = acpi_enable_gpe(handle, index); 679 else if (!strcmp(buf, "clear\n") && 680 (status & ACPI_EVENT_FLAG_STATUS_SET)) 681 result = acpi_clear_gpe(handle, index); 682 else if (!strcmp(buf, "mask\n")) 683 result = acpi_mask_gpe(handle, index, TRUE); 684 else if (!strcmp(buf, "unmask\n")) 685 result = acpi_mask_gpe(handle, index, FALSE); 686 else if (!kstrtoul(buf, 0, &tmp)) 687 all_counters[index].count = tmp; 688 else 689 result = -EINVAL; 690 } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) { 691 int event = index - num_gpes; 692 if (!strcmp(buf, "disable\n") && 693 (status & ACPI_EVENT_FLAG_ENABLE_SET)) 694 result = acpi_disable_event(event, ACPI_NOT_ISR); 695 else if (!strcmp(buf, "enable\n") && 696 !(status & ACPI_EVENT_FLAG_ENABLE_SET)) 697 result = acpi_enable_event(event, ACPI_NOT_ISR); 698 else if (!strcmp(buf, "clear\n") && 699 (status & ACPI_EVENT_FLAG_STATUS_SET)) 700 result = acpi_clear_event(event); 701 else if (!kstrtoul(buf, 0, &tmp)) 702 all_counters[index].count = tmp; 703 else 704 result = -EINVAL; 705 } else 706 all_counters[index].count = strtoul(buf, NULL, 0); 707 708 if (ACPI_FAILURE(result)) 709 result = -EINVAL; 710 end: 711 return result ? result : size; 712 } 713 714 /* 715 * A Quirk Mechanism for GPE Flooding Prevention: 716 * 717 * Quirks may be needed to prevent GPE flooding on a specific GPE. The 718 * flooding typically cannot be detected and automatically prevented by 719 * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in 720 * the AML tables. This normally indicates a feature gap in Linux, thus 721 * instead of providing endless quirk tables, we provide a boot parameter 722 * for those who want this quirk. For example, if the users want to prevent 723 * the GPE flooding for GPE 00, they need to specify the following boot 724 * parameter: 725 * acpi_mask_gpe=0x00 726 * The masking status can be modified by the following runtime controlling 727 * interface: 728 * echo unmask > /sys/firmware/acpi/interrupts/gpe00 729 */ 730 731 /* 732 * Currently, the GPE flooding prevention only supports to mask the GPEs 733 * numbered from 00 to 7f. 734 */ 735 #define ACPI_MASKABLE_GPE_MAX 0x80 736 737 static u64 __initdata acpi_masked_gpes; 738 739 static int __init acpi_gpe_set_masked_gpes(char *val) 740 { 741 u8 gpe; 742 743 if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX) 744 return -EINVAL; 745 acpi_masked_gpes |= ((u64)1<<gpe); 746 747 return 1; 748 } 749 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes); 750 751 void __init acpi_gpe_apply_masked_gpes(void) 752 { 753 acpi_handle handle; 754 acpi_status status; 755 u8 gpe; 756 757 for (gpe = 0; 758 gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count); 759 gpe++) { 760 if (acpi_masked_gpes & ((u64)1<<gpe)) { 761 status = acpi_get_gpe_device(gpe, &handle); 762 if (ACPI_SUCCESS(status)) { 763 pr_info("Masking GPE 0x%x.\n", gpe); 764 (void)acpi_mask_gpe(handle, gpe, TRUE); 765 } 766 } 767 } 768 } 769 770 void acpi_irq_stats_init(void) 771 { 772 acpi_status status; 773 int i; 774 775 if (all_counters) 776 return; 777 778 num_gpes = acpi_current_gpe_count; 779 num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA; 780 781 all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1), 782 GFP_KERNEL); 783 if (all_attrs == NULL) 784 return; 785 786 all_counters = kzalloc(sizeof(struct event_counter) * (num_counters), 787 GFP_KERNEL); 788 if (all_counters == NULL) 789 goto fail; 790 791 status = acpi_install_global_event_handler(acpi_global_event_handler, NULL); 792 if (ACPI_FAILURE(status)) 793 goto fail; 794 795 counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters), 796 GFP_KERNEL); 797 if (counter_attrs == NULL) 798 goto fail; 799 800 for (i = 0; i < num_counters; ++i) { 801 char buffer[12]; 802 char *name; 803 804 if (i < num_gpes) 805 sprintf(buffer, "gpe%02X", i); 806 else if (i == num_gpes + ACPI_EVENT_PMTIMER) 807 sprintf(buffer, "ff_pmtimer"); 808 else if (i == num_gpes + ACPI_EVENT_GLOBAL) 809 sprintf(buffer, "ff_gbl_lock"); 810 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON) 811 sprintf(buffer, "ff_pwr_btn"); 812 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON) 813 sprintf(buffer, "ff_slp_btn"); 814 else if (i == num_gpes + ACPI_EVENT_RTC) 815 sprintf(buffer, "ff_rt_clk"); 816 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE) 817 sprintf(buffer, "gpe_all"); 818 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) 819 sprintf(buffer, "sci"); 820 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT) 821 sprintf(buffer, "sci_not"); 822 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR) 823 sprintf(buffer, "error"); 824 else 825 sprintf(buffer, "bug%02X", i); 826 827 name = kstrdup(buffer, GFP_KERNEL); 828 if (name == NULL) 829 goto fail; 830 831 sysfs_attr_init(&counter_attrs[i].attr); 832 counter_attrs[i].attr.name = name; 833 counter_attrs[i].attr.mode = 0644; 834 counter_attrs[i].show = counter_show; 835 counter_attrs[i].store = counter_set; 836 837 all_attrs[i] = &counter_attrs[i].attr; 838 } 839 840 interrupt_stats_attr_group.attrs = all_attrs; 841 if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group)) 842 return; 843 844 fail: 845 delete_gpe_attr_array(); 846 return; 847 } 848 849 static void __exit interrupt_stats_exit(void) 850 { 851 sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group); 852 853 delete_gpe_attr_array(); 854 855 return; 856 } 857 858 static ssize_t 859 acpi_show_profile(struct device *dev, struct device_attribute *attr, 860 char *buf) 861 { 862 return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile); 863 } 864 865 static const struct device_attribute pm_profile_attr = 866 __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL); 867 868 static ssize_t hotplug_enabled_show(struct kobject *kobj, 869 struct kobj_attribute *attr, char *buf) 870 { 871 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 872 873 return sprintf(buf, "%d\n", hotplug->enabled); 874 } 875 876 static ssize_t hotplug_enabled_store(struct kobject *kobj, 877 struct kobj_attribute *attr, 878 const char *buf, size_t size) 879 { 880 struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj); 881 unsigned int val; 882 883 if (kstrtouint(buf, 10, &val) || val > 1) 884 return -EINVAL; 885 886 acpi_scan_hotplug_enabled(hotplug, val); 887 return size; 888 } 889 890 static struct kobj_attribute hotplug_enabled_attr = 891 __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show, 892 hotplug_enabled_store); 893 894 static struct attribute *hotplug_profile_attrs[] = { 895 &hotplug_enabled_attr.attr, 896 NULL 897 }; 898 899 static struct kobj_type acpi_hotplug_profile_ktype = { 900 .sysfs_ops = &kobj_sysfs_ops, 901 .default_attrs = hotplug_profile_attrs, 902 }; 903 904 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug, 905 const char *name) 906 { 907 int error; 908 909 if (!hotplug_kobj) 910 goto err_out; 911 912 error = kobject_init_and_add(&hotplug->kobj, 913 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name); 914 if (error) 915 goto err_out; 916 917 kobject_uevent(&hotplug->kobj, KOBJ_ADD); 918 return; 919 920 err_out: 921 pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name); 922 } 923 924 static ssize_t force_remove_show(struct kobject *kobj, 925 struct kobj_attribute *attr, char *buf) 926 { 927 return sprintf(buf, "%d\n", 0); 928 } 929 930 static ssize_t force_remove_store(struct kobject *kobj, 931 struct kobj_attribute *attr, 932 const char *buf, size_t size) 933 { 934 bool val; 935 int ret; 936 937 ret = strtobool(buf, &val); 938 if (ret < 0) 939 return ret; 940 941 if (val) { 942 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n"); 943 return -EINVAL; 944 } 945 return size; 946 } 947 948 static const struct kobj_attribute force_remove_attr = 949 __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show, 950 force_remove_store); 951 952 int __init acpi_sysfs_init(void) 953 { 954 int result; 955 956 result = acpi_tables_sysfs_init(); 957 if (result) 958 return result; 959 960 hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj); 961 if (!hotplug_kobj) 962 return -ENOMEM; 963 964 result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr); 965 if (result) 966 return result; 967 968 result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr); 969 return result; 970 } 971