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