drivers/acpi/sysfs.c

   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, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 165 module_param_cb(debug_level, &param_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, &param_ops_trace_method, &trace_method_name, 0644);
 227 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 228 module_param_cb(trace_debug_level, &param_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 }