drivers/acpi/sysfs.c

   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/acpi.h>
   9 #include <linux/bitmap.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/moduleparam.h>
  13
  14 #include "internal.h"
  15
  16 #ifdef CONFIG_ACPI_DEBUG
  17 /*
  18  * ACPI debug sysfs I/F, including:
  19  * /sys/modules/acpi/parameters/debug_layer
  20  * /sys/modules/acpi/parameters/debug_level
  21  * /sys/modules/acpi/parameters/trace_method_name
  22  * /sys/modules/acpi/parameters/trace_state
  23  * /sys/modules/acpi/parameters/trace_debug_layer
  24  * /sys/modules/acpi/parameters/trace_debug_level
  25  */
  26
  27 struct acpi_dlayer {
  28         const char *name;
  29         unsigned long value;
  30 };
  31 struct acpi_dlevel {
  32         const char *name;
  33         unsigned long value;
  34 };
  35 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  36
  37 static const struct acpi_dlayer acpi_debug_layers[] = {
  38         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  39         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  40         ACPI_DEBUG_INIT(ACPI_EVENTS),
  41         ACPI_DEBUG_INIT(ACPI_TABLES),
  42         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  43         ACPI_DEBUG_INIT(ACPI_PARSER),
  44         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  45         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  46         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  47         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  48         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  49         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  50         ACPI_DEBUG_INIT(ACPI_COMPILER),
  51         ACPI_DEBUG_INIT(ACPI_TOOLS),
  52 };
  53
  54 static const struct acpi_dlevel acpi_debug_levels[] = {
  55         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  56         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  57         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  58         ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
  59         ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
  60
  61         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  62         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  63         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  64         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  65         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  66         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  67         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  68         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  69         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  70         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  71         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  72         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  73         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  74         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  75
  76         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  77         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  78         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  79
  80         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  81         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  82         ACPI_DEBUG_INIT(ACPI_LV_IO),
  83         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  84
  85         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  86         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  87         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  88         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  89 };
  90
  91 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
  92 {
  93         int result = 0;
  94         int i;
  95
  96         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
  97
  98         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
  99                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 100                                   acpi_debug_layers[i].name,
 101                                   acpi_debug_layers[i].value,
 102                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
 103                                   ? '*' : ' ');
 104         }
 105         result +=
 106             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 107                     ACPI_ALL_DRIVERS,
 108                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 109                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
 110                     == 0 ? ' ' : '-');
 111         result +=
 112             sprintf(buffer + result,
 113                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
 114                     acpi_dbg_layer);
 115
 116         return result;
 117 }
 118
 119 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 120 {
 121         int result = 0;
 122         int i;
 123
 124         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 125
 126         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 127                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 128                                   acpi_debug_levels[i].name,
 129                                   acpi_debug_levels[i].value,
 130                                   (acpi_dbg_level & acpi_debug_levels[i].value)
 131                                   ? '*' : ' ');
 132         }
 133         result +=
 134             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 135                     acpi_dbg_level);
 136
 137         return result;
 138 }
 139
 140 static const struct kernel_param_ops param_ops_debug_layer = {
 141         .set = param_set_uint,
 142         .get = param_get_debug_layer,
 143 };
 144
 145 static const struct kernel_param_ops param_ops_debug_level = {
 146         .set = param_set_uint,
 147         .get = param_get_debug_level,
 148 };
 149
 150 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 151 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 152
 153 static char trace_method_name[1024];
 154
 155 static int param_set_trace_method_name(const char *val,
 156                                        const struct kernel_param *kp)
 157 {
 158         u32 saved_flags = 0;
 159         bool is_abs_path = true;
 160
 161         if (*val != '\\')
 162                 is_abs_path = false;
 163
 164         if ((is_abs_path && strlen(val) > 1023) ||
 165             (!is_abs_path && strlen(val) > 1022)) {
 166                 pr_err("%s: string parameter too long\n", kp->name);
 167                 return -ENOSPC;
 168         }
 169
 170         /*
 171          * It's not safe to update acpi_gbl_trace_method_name without
 172          * having the tracer stopped, so we save the original tracer
 173          * state and disable it.
 174          */
 175         saved_flags = acpi_gbl_trace_flags;
 176         (void)acpi_debug_trace(NULL,
 177                                acpi_gbl_trace_dbg_level,
 178                                acpi_gbl_trace_dbg_layer,
 179                                0);
 180
 181         /* This is a hack.  We can't kmalloc in early boot. */
 182         if (is_abs_path)
 183                 strcpy(trace_method_name, val);
 184         else {
 185                 trace_method_name[0] = '\\';
 186                 strcpy(trace_method_name+1, val);
 187         }
 188
 189         /* Restore the original tracer state */
 190         (void)acpi_debug_trace(trace_method_name,
 191                                acpi_gbl_trace_dbg_level,
 192                                acpi_gbl_trace_dbg_layer,
 193                                saved_flags);
 194
 195         return 0;
 196 }
 197
 198 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
 199 {
 200         return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
 201 }
 202
 203 static const struct kernel_param_ops param_ops_trace_method = {
 204         .set = param_set_trace_method_name,
 205         .get = param_get_trace_method_name,
 206 };
 207
 208 static const struct kernel_param_ops param_ops_trace_attrib = {
 209         .set = param_set_uint,
 210         .get = param_get_uint,
 211 };
 212
 213 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
 214 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 215 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 216
 217 static int param_set_trace_state(const char *val,
 218                                  const struct kernel_param *kp)
 219 {
 220         acpi_status status;
 221         const char *method = trace_method_name;
 222         u32 flags = 0;
 223
 224 /* So "xxx-once" comparison should go prior than "xxx" comparison */
 225 #define acpi_compare_param(val, key)    \
 226         strncmp((val), (key), sizeof(key) - 1)
 227
 228         if (!acpi_compare_param(val, "enable")) {
 229                 method = NULL;
 230                 flags = ACPI_TRACE_ENABLED;
 231         } else if (!acpi_compare_param(val, "disable"))
 232                 method = NULL;
 233         else if (!acpi_compare_param(val, "method-once"))
 234                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
 235         else if (!acpi_compare_param(val, "method"))
 236                 flags = ACPI_TRACE_ENABLED;
 237         else if (!acpi_compare_param(val, "opcode-once"))
 238                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
 239         else if (!acpi_compare_param(val, "opcode"))
 240                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
 241         else
 242                 return -EINVAL;
 243
 244         status = acpi_debug_trace(method,
 245                                   acpi_gbl_trace_dbg_level,
 246                                   acpi_gbl_trace_dbg_layer,
 247                                   flags);
 248         if (ACPI_FAILURE(status))
 249                 return -EBUSY;
 250
 251         return 0;
 252 }
 253
 254 static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
 255 {
 256         if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
 257                 return sprintf(buffer, "disable\n");
 258         if (!acpi_gbl_trace_method_name)
 259                 return sprintf(buffer, "enable\n");
 260         if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
 261                 return sprintf(buffer, "method-once\n");
 262         else
 263                 return sprintf(buffer, "method\n");
 264 }
 265
 266 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 267                   NULL, 0644);
 268 #endif /* CONFIG_ACPI_DEBUG */
 269
 270
 271 /* /sys/modules/acpi/parameters/aml_debug_output */
 272
 273 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 274                    byte, 0644);
 275 MODULE_PARM_DESC(aml_debug_output,
 276                  "To enable/disable the ACPI Debug Object output.");
 277
 278 /* /sys/module/acpi/parameters/acpica_version */
 279 static int param_get_acpica_version(char *buffer,
 280                                     const struct kernel_param *kp)
 281 {
 282         int result;
 283
 284         result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
 285
 286         return result;
 287 }
 288
 289 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
 290
 291 /*
 292  * ACPI table sysfs I/F:
 293  * /sys/firmware/acpi/tables/
 294  * /sys/firmware/acpi/tables/data/
 295  * /sys/firmware/acpi/tables/dynamic/
 296  */
 297
 298 static LIST_HEAD(acpi_table_attr_list);
 299 static struct kobject *tables_kobj;
 300 static struct kobject *tables_data_kobj;
 301 static struct kobject *dynamic_tables_kobj;
 302 static struct kobject *hotplug_kobj;
 303
 304 #define ACPI_MAX_TABLE_INSTANCES        999
 305 #define ACPI_INST_SIZE                  4 /* including trailing 0 */
 306
 307 struct acpi_table_attr {
 308         struct bin_attribute attr;
 309         char name[ACPI_NAMESEG_SIZE];
 310         int instance;
 311         char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
 312         struct list_head node;
 313 };
 314
 315 struct acpi_data_attr {
 316         struct bin_attribute attr;
 317         u64     addr;
 318 };
 319
 320 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
 321                                struct bin_attribute *bin_attr, char *buf,
 322                                loff_t offset, size_t count)
 323 {
 324         struct acpi_table_attr *table_attr =
 325             container_of(bin_attr, struct acpi_table_attr, attr);
 326         struct acpi_table_header *table_header = NULL;
 327         acpi_status status;
 328         ssize_t rc;
 329
 330         status = acpi_get_table(table_attr->name, table_attr->instance,
 331                                 &table_header);
 332         if (ACPI_FAILURE(status))
 333                 return -ENODEV;
 334
 335         rc = memory_read_from_buffer(buf, count, &offset, table_header,
 336                         table_header->length);
 337         acpi_put_table(table_header);
 338         return rc;
 339 }
 340
 341 static int acpi_table_attr_init(struct kobject *tables_obj,
 342                                 struct acpi_table_attr *table_attr,
 343                                 struct acpi_table_header *table_header)
 344 {
 345         struct acpi_table_header *header = NULL;
 346         struct acpi_table_attr *attr = NULL;
 347         char instance_str[ACPI_INST_SIZE];
 348
 349         sysfs_attr_init(&table_attr->attr.attr);
 350         ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
 351
 352         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 353                 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
 354                         if (table_attr->instance < attr->instance)
 355                                 table_attr->instance = attr->instance;
 356         }
 357         table_attr->instance++;
 358         if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
 359                 pr_warn("%4.4s: too many table instances\n", table_attr->name);
 360                 return -ERANGE;
 361         }
 362
 363         ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
 364         table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
 365         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 366                                          !acpi_get_table
 367                                          (table_header->signature, 2, &header))) {
 368                 snprintf(instance_str, sizeof(instance_str), "%u",
 369                          table_attr->instance);
 370                 strcat(table_attr->filename, instance_str);
 371         }
 372
 373         table_attr->attr.size = table_header->length;
 374         table_attr->attr.read = acpi_table_show;
 375         table_attr->attr.attr.name = table_attr->filename;
 376         table_attr->attr.attr.mode = 0400;
 377
 378         return sysfs_create_bin_file(tables_obj, &table_attr->attr);
 379 }
 380
 381 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
 382 {
 383         struct acpi_table_attr *table_attr;
 384
 385         switch (event) {
 386         case ACPI_TABLE_EVENT_INSTALL:
 387                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
 388                 if (!table_attr)
 389                         return AE_NO_MEMORY;
 390
 391                 if (acpi_table_attr_init(dynamic_tables_kobj,
 392                                          table_attr, table)) {
 393                         kfree(table_attr);
 394                         return AE_ERROR;
 395                 }
 396                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 397                 break;
 398         case ACPI_TABLE_EVENT_LOAD:
 399         case ACPI_TABLE_EVENT_UNLOAD:
 400         case ACPI_TABLE_EVENT_UNINSTALL:
 401                 /*
 402                  * we do not need to do anything right now
 403                  * because the table is not deleted from the
 404                  * global table list when unloading it.
 405                  */
 406                 break;
 407         default:
 408                 return AE_BAD_PARAMETER;
 409         }
 410         return AE_OK;
 411 }
 412
 413 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
 414                               struct bin_attribute *bin_attr, char *buf,
 415                               loff_t offset, size_t count)
 416 {
 417         struct acpi_data_attr *data_attr;
 418         void *base;
 419         ssize_t rc;
 420
 421         data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
 422
 423         base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
 424         if (!base)
 425                 return -ENOMEM;
 426         rc = memory_read_from_buffer(buf, count, &offset, base,
 427                                      data_attr->attr.size);
 428         acpi_os_unmap_memory(base, data_attr->attr.size);
 429
 430         return rc;
 431 }
 432
 433 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
 434 {
 435         struct acpi_table_bert *bert = th;
 436
 437         if (bert->header.length < sizeof(struct acpi_table_bert) ||
 438             bert->region_length < sizeof(struct acpi_hest_generic_status)) {
 439                 kfree(data_attr);
 440                 return -EINVAL;
 441         }
 442         data_attr->addr = bert->address;
 443         data_attr->attr.size = bert->region_length;
 444         data_attr->attr.attr.name = "BERT";
 445
 446         return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
 447 }
 448
 449 static struct acpi_data_obj {
 450         char *name;
 451         int (*fn)(void *, struct acpi_data_attr *);
 452 } acpi_data_objs[] = {
 453         { ACPI_SIG_BERT, acpi_bert_data_init },
 454 };
 455
 456 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
 457
 458 static int acpi_table_data_init(struct acpi_table_header *th)
 459 {
 460         struct acpi_data_attr *data_attr;
 461         int i;
 462
 463         for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
 464                 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
 465                         data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
 466                         if (!data_attr)
 467                                 return -ENOMEM;
 468                         sysfs_attr_init(&data_attr->attr.attr);
 469                         data_attr->attr.read = acpi_data_show;
 470                         data_attr->attr.attr.mode = 0400;
 471                         return acpi_data_objs[i].fn(th, data_attr);
 472                 }
 473         }
 474         return 0;
 475 }
 476
 477 static int acpi_tables_sysfs_init(void)
 478 {
 479         struct acpi_table_attr *table_attr;
 480         struct acpi_table_header *table_header = NULL;
 481         int table_index;
 482         acpi_status status;
 483         int ret;
 484
 485         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 486         if (!tables_kobj)
 487                 goto err;
 488
 489         tables_data_kobj = kobject_create_and_add("data", tables_kobj);
 490         if (!tables_data_kobj)
 491                 goto err_tables_data;
 492
 493         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 494         if (!dynamic_tables_kobj)
 495                 goto err_dynamic_tables;
 496
 497         for (table_index = 0;; table_index++) {
 498                 status = acpi_get_table_by_index(table_index, &table_header);
 499
 500                 if (status == AE_BAD_PARAMETER)
 501                         break;
 502
 503                 if (ACPI_FAILURE(status))
 504                         continue;
 505
 506                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
 507                 if (!table_attr)
 508                         return -ENOMEM;
 509
 510                 ret = acpi_table_attr_init(tables_kobj,
 511                                            table_attr, table_header);
 512                 if (ret) {
 513                         kfree(table_attr);
 514                         return ret;
 515                 }
 516                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 517                 acpi_table_data_init(table_header);
 518         }
 519
 520         kobject_uevent(tables_kobj, KOBJ_ADD);
 521         kobject_uevent(tables_data_kobj, KOBJ_ADD);
 522         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 523
 524         return 0;
 525 err_dynamic_tables:
 526         kobject_put(tables_data_kobj);
 527 err_tables_data:
 528         kobject_put(tables_kobj);
 529 err:
 530         return -ENOMEM;
 531 }
 532
 533 /*
 534  * Detailed ACPI IRQ counters:
 535  * /sys/firmware/acpi/interrupts/
 536  */
 537
 538 u32 acpi_irq_handled;
 539 u32 acpi_irq_not_handled;
 540
 541 #define COUNT_GPE 0
 542 #define COUNT_SCI 1             /* acpi_irq_handled */
 543 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
 544 #define COUNT_ERROR 3           /* other */
 545 #define NUM_COUNTERS_EXTRA 4
 546
 547 struct event_counter {
 548         u32 count;
 549         u32 flags;
 550 };
 551
 552 static struct event_counter *all_counters;
 553 static u32 num_gpes;
 554 static u32 num_counters;
 555 static struct attribute **all_attrs;
 556 static u32 acpi_gpe_count;
 557
 558 static struct attribute_group interrupt_stats_attr_group = {
 559         .name = "interrupts",
 560 };
 561
 562 static struct kobj_attribute *counter_attrs;
 563
 564 static void delete_gpe_attr_array(void)
 565 {
 566         struct event_counter *tmp = all_counters;
 567
 568         all_counters = NULL;
 569         kfree(tmp);
 570
 571         if (counter_attrs) {
 572                 int i;
 573
 574                 for (i = 0; i < num_gpes; i++)
 575                         kfree(counter_attrs[i].attr.name);
 576
 577                 kfree(counter_attrs);
 578         }
 579         kfree(all_attrs);
 580 }
 581
 582 static void gpe_count(u32 gpe_number)
 583 {
 584         acpi_gpe_count++;
 585
 586         if (!all_counters)
 587                 return;
 588
 589         if (gpe_number < num_gpes)
 590                 all_counters[gpe_number].count++;
 591         else
 592                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 593                              COUNT_ERROR].count++;
 594 }
 595
 596 static void fixed_event_count(u32 event_number)
 597 {
 598         if (!all_counters)
 599                 return;
 600
 601         if (event_number < ACPI_NUM_FIXED_EVENTS)
 602                 all_counters[num_gpes + event_number].count++;
 603         else
 604                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 605                              COUNT_ERROR].count++;
 606 }
 607
 608 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
 609         u32 event_number, void *context)
 610 {
 611         if (event_type == ACPI_EVENT_TYPE_GPE) {
 612                 gpe_count(event_number);
 613                 pr_debug("GPE event 0x%02x\n", event_number);
 614         } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
 615                 fixed_event_count(event_number);
 616                 pr_debug("Fixed event 0x%02x\n", event_number);
 617         } else {
 618                 pr_debug("Other event 0x%02x\n", event_number);
 619         }
 620 }
 621
 622 static int get_status(u32 index, acpi_event_status *ret,
 623                       acpi_handle *handle)
 624 {
 625         acpi_status status;
 626
 627         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 628                 return -EINVAL;
 629
 630         if (index < num_gpes) {
 631                 status = acpi_get_gpe_device(index, handle);
 632                 if (ACPI_FAILURE(status)) {
 633                         pr_warn("Invalid GPE 0x%x", index);
 634                         return -ENXIO;
 635                 }
 636                 status = acpi_get_gpe_status(*handle, index, ret);
 637         } else {
 638                 status = acpi_get_event_status(index - num_gpes, ret);
 639         }
 640         if (ACPI_FAILURE(status))
 641                 return -EIO;
 642
 643         return 0;
 644 }
 645
 646 static ssize_t counter_show(struct kobject *kobj,
 647                             struct kobj_attribute *attr, char *buf)
 648 {
 649         int index = attr - counter_attrs;
 650         int size;
 651         acpi_handle handle;
 652         acpi_event_status status;
 653         int result = 0;
 654
 655         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 656             acpi_irq_handled;
 657         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 658             acpi_irq_not_handled;
 659         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 660             acpi_gpe_count;
 661         size = sprintf(buf, "%8u", all_counters[index].count);
 662
 663         /* "gpe_all" or "sci" */
 664         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 665                 goto end;
 666
 667         result = get_status(index, &status, &handle);
 668         if (result)
 669                 goto end;
 670
 671         if (status & ACPI_EVENT_FLAG_ENABLE_SET)
 672                 size += sprintf(buf + size, "  EN");
 673         else
 674                 size += sprintf(buf + size, "    ");
 675         if (status & ACPI_EVENT_FLAG_STATUS_SET)
 676                 size += sprintf(buf + size, " STS");
 677         else
 678                 size += sprintf(buf + size, "    ");
 679
 680         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
 681                 size += sprintf(buf + size, " invalid     ");
 682         else if (status & ACPI_EVENT_FLAG_ENABLED)
 683                 size += sprintf(buf + size, " enabled     ");
 684         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 685                 size += sprintf(buf + size, " wake_enabled");
 686         else
 687                 size += sprintf(buf + size, " disabled    ");
 688         if (status & ACPI_EVENT_FLAG_MASKED)
 689                 size += sprintf(buf + size, " masked  ");
 690         else
 691                 size += sprintf(buf + size, " unmasked");
 692
 693 end:
 694         size += sprintf(buf + size, "\n");
 695         return result ? result : size;
 696 }
 697
 698 /*
 699  * counter_set() sets the specified counter.
 700  * setting the total "sci" file to any value clears all counters.
 701  * enable/disable/clear a gpe/fixed event in user space.
 702  */
 703 static ssize_t counter_set(struct kobject *kobj,
 704                            struct kobj_attribute *attr, const char *buf,
 705                            size_t size)
 706 {
 707         int index = attr - counter_attrs;
 708         acpi_event_status status;
 709         acpi_handle handle;
 710         int result = 0;
 711         unsigned long tmp;
 712
 713         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 714                 int i;
 715                 for (i = 0; i < num_counters; ++i)
 716                         all_counters[i].count = 0;
 717                 acpi_gpe_count = 0;
 718                 acpi_irq_handled = 0;
 719                 acpi_irq_not_handled = 0;
 720                 goto end;
 721         }
 722
 723         /* show the event status for both GPEs and Fixed Events */
 724         result = get_status(index, &status, &handle);
 725         if (result)
 726                 goto end;
 727
 728         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
 729                 pr_warn("Can not change Invalid GPE/Fixed Event status\n");
 730                 return -EINVAL;
 731         }
 732
 733         if (index < num_gpes) {
 734                 if (!strcmp(buf, "disable\n") &&
 735                     (status & ACPI_EVENT_FLAG_ENABLED))
 736                         result = acpi_disable_gpe(handle, index);
 737                 else if (!strcmp(buf, "enable\n") &&
 738                          !(status & ACPI_EVENT_FLAG_ENABLED))
 739                         result = acpi_enable_gpe(handle, index);
 740                 else if (!strcmp(buf, "clear\n") &&
 741                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 742                         result = acpi_clear_gpe(handle, index);
 743                 else if (!strcmp(buf, "mask\n"))
 744                         result = acpi_mask_gpe(handle, index, TRUE);
 745                 else if (!strcmp(buf, "unmask\n"))
 746                         result = acpi_mask_gpe(handle, index, FALSE);
 747                 else if (!kstrtoul(buf, 0, &tmp))
 748                         all_counters[index].count = tmp;
 749                 else
 750                         result = -EINVAL;
 751         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 752                 int event = index - num_gpes;
 753                 if (!strcmp(buf, "disable\n") &&
 754                     (status & ACPI_EVENT_FLAG_ENABLE_SET))
 755                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 756                 else if (!strcmp(buf, "enable\n") &&
 757                          !(status & ACPI_EVENT_FLAG_ENABLE_SET))
 758                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 759                 else if (!strcmp(buf, "clear\n") &&
 760                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 761                         result = acpi_clear_event(event);
 762                 else if (!kstrtoul(buf, 0, &tmp))
 763                         all_counters[index].count = tmp;
 764                 else
 765                         result = -EINVAL;
 766         } else
 767                 all_counters[index].count = strtoul(buf, NULL, 0);
 768
 769         if (ACPI_FAILURE(result))
 770                 result = -EINVAL;
 771 end:
 772         return result ? result : size;
 773 }
 774
 775 /*
 776  * A Quirk Mechanism for GPE Flooding Prevention:
 777  *
 778  * Quirks may be needed to prevent GPE flooding on a specific GPE. The
 779  * flooding typically cannot be detected and automatically prevented by
 780  * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
 781  * the AML tables. This normally indicates a feature gap in Linux, thus
 782  * instead of providing endless quirk tables, we provide a boot parameter
 783  * for those who want this quirk. For example, if the users want to prevent
 784  * the GPE flooding for GPE 00, they need to specify the following boot
 785  * parameter:
 786  *   acpi_mask_gpe=0x00
 787  * Note, the parameter can be a list (see bitmap_parselist() for the details).
 788  * The masking status can be modified by the following runtime controlling
 789  * interface:
 790  *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
 791  */
 792 #define ACPI_MASKABLE_GPE_MAX   0x100
 793 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
 794
 795 static int __init acpi_gpe_set_masked_gpes(char *val)
 796 {
 797         int ret;
 798         u8 gpe;
 799
 800         ret = kstrtou8(val, 0, &gpe);
 801         if (ret) {
 802                 ret = bitmap_parselist(val, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX);
 803                 if (ret)
 804                         return ret;
 805         } else
 806                 set_bit(gpe, acpi_masked_gpes_map);
 807
 808         return 1;
 809 }
 810 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
 811
 812 void __init acpi_gpe_apply_masked_gpes(void)
 813 {
 814         acpi_handle handle;
 815         acpi_status status;
 816         u16 gpe;
 817
 818         for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
 819                 status = acpi_get_gpe_device(gpe, &handle);
 820                 if (ACPI_SUCCESS(status)) {
 821                         pr_info("Masking GPE 0x%x.\n", gpe);
 822                         (void)acpi_mask_gpe(handle, gpe, TRUE);
 823                 }
 824         }
 825 }
 826
 827 void acpi_irq_stats_init(void)
 828 {
 829         acpi_status status;
 830         int i;
 831
 832         if (all_counters)
 833                 return;
 834
 835         num_gpes = acpi_current_gpe_count;
 836         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 837
 838         all_attrs = kcalloc(num_counters + 1, sizeof(*all_attrs), GFP_KERNEL);
 839         if (all_attrs == NULL)
 840                 return;
 841
 842         all_counters = kcalloc(num_counters, sizeof(*all_counters), GFP_KERNEL);
 843         if (all_counters == NULL)
 844                 goto fail;
 845
 846         status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
 847         if (ACPI_FAILURE(status))
 848                 goto fail;
 849
 850         counter_attrs = kcalloc(num_counters, sizeof(*counter_attrs), GFP_KERNEL);
 851         if (counter_attrs == NULL)
 852                 goto fail;
 853
 854         for (i = 0; i < num_counters; ++i) {
 855                 char buffer[12];
 856                 char *name;
 857
 858                 if (i < num_gpes)
 859                         sprintf(buffer, "gpe%02X", i);
 860                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 861                         sprintf(buffer, "ff_pmtimer");
 862                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 863                         sprintf(buffer, "ff_gbl_lock");
 864                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 865                         sprintf(buffer, "ff_pwr_btn");
 866                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 867                         sprintf(buffer, "ff_slp_btn");
 868                 else if (i == num_gpes + ACPI_EVENT_RTC)
 869                         sprintf(buffer, "ff_rt_clk");
 870                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 871                         sprintf(buffer, "gpe_all");
 872                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 873                         sprintf(buffer, "sci");
 874                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 875                         sprintf(buffer, "sci_not");
 876                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 877                         sprintf(buffer, "error");
 878                 else
 879                         sprintf(buffer, "bug%02X", i);
 880
 881                 name = kstrdup(buffer, GFP_KERNEL);
 882                 if (name == NULL)
 883                         goto fail;
 884
 885                 sysfs_attr_init(&counter_attrs[i].attr);
 886                 counter_attrs[i].attr.name = name;
 887                 counter_attrs[i].attr.mode = 0644;
 888                 counter_attrs[i].show = counter_show;
 889                 counter_attrs[i].store = counter_set;
 890
 891                 all_attrs[i] = &counter_attrs[i].attr;
 892         }
 893
 894         interrupt_stats_attr_group.attrs = all_attrs;
 895         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 896                 return;
 897
 898 fail:
 899         delete_gpe_attr_array();
 900 }
 901
 902 static void __exit interrupt_stats_exit(void)
 903 {
 904         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 905
 906         delete_gpe_attr_array();
 907 }
 908
 909 static ssize_t pm_profile_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 910 {
 911         return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
 912 }
 913
 914 static const struct kobj_attribute pm_profile_attr = __ATTR_RO(pm_profile);
 915
 916 static ssize_t enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 917 {
 918         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 919
 920         return sprintf(buf, "%d\n", hotplug->enabled);
 921 }
 922
 923 static ssize_t enabled_store(struct kobject *kobj, struct kobj_attribute *attr,
 924                              const char *buf, size_t size)
 925 {
 926         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 927         unsigned int val;
 928
 929         if (kstrtouint(buf, 10, &val) || val > 1)
 930                 return -EINVAL;
 931
 932         acpi_scan_hotplug_enabled(hotplug, val);
 933         return size;
 934 }
 935
 936 static struct kobj_attribute hotplug_enabled_attr = __ATTR_RW(enabled);
 937
 938 static struct attribute *hotplug_profile_attrs[] = {
 939         &hotplug_enabled_attr.attr,
 940         NULL
 941 };
 942
 943 static struct kobj_type acpi_hotplug_profile_ktype = {
 944         .sysfs_ops = &kobj_sysfs_ops,
 945         .default_attrs = hotplug_profile_attrs,
 946 };
 947
 948 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
 949                                     const char *name)
 950 {
 951         int error;
 952
 953         if (!hotplug_kobj)
 954                 goto err_out;
 955
 956         error = kobject_init_and_add(&hotplug->kobj,
 957                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
 958         if (error) {
 959                 kobject_put(&hotplug->kobj);
 960                 goto err_out;
 961         }
 962
 963         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
 964         return;
 965
 966  err_out:
 967         pr_err("Unable to add hotplug profile '%s'\n", name);
 968 }
 969
 970 static ssize_t force_remove_show(struct kobject *kobj,
 971                                  struct kobj_attribute *attr, char *buf)
 972 {
 973         return sprintf(buf, "%d\n", 0);
 974 }
 975
 976 static ssize_t force_remove_store(struct kobject *kobj,
 977                                   struct kobj_attribute *attr,
 978                                   const char *buf, size_t size)
 979 {
 980         bool val;
 981         int ret;
 982
 983         ret = strtobool(buf, &val);
 984         if (ret < 0)
 985                 return ret;
 986
 987         if (val) {
 988                 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
 989                 return -EINVAL;
 990         }
 991         return size;
 992 }
 993
 994 static const struct kobj_attribute force_remove_attr = __ATTR_RW(force_remove);
 995
 996 int __init acpi_sysfs_init(void)
 997 {
 998         int result;
 999
1000         result = acpi_tables_sysfs_init();
1001         if (result)
1002                 return result;
1003
1004         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1005         if (!hotplug_kobj)
1006                 return -ENOMEM;
1007
1008         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1009         if (result)
1010                 return result;
1011
1012         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1013         return result;
1014 }