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         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 }