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/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/acpi.h>
  12
  13 #include "internal.h"
  14
  15 #ifdef CONFIG_ACPI_DEBUG
  16 /*
  17  * ACPI debug sysfs I/F, including:
  18  * /sys/modules/acpi/parameters/debug_layer
  19  * /sys/modules/acpi/parameters/debug_level
  20  * /sys/modules/acpi/parameters/trace_method_name
  21  * /sys/modules/acpi/parameters/trace_state
  22  * /sys/modules/acpi/parameters/trace_debug_layer
  23  * /sys/modules/acpi/parameters/trace_debug_level
  24  */
  25
  26 struct acpi_dlayer {
  27         const char *name;
  28         unsigned long value;
  29 };
  30 struct acpi_dlevel {
  31         const char *name;
  32         unsigned long value;
  33 };
  34 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  35
  36 static const struct acpi_dlayer acpi_debug_layers[] = {
  37         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  38         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  39         ACPI_DEBUG_INIT(ACPI_EVENTS),
  40         ACPI_DEBUG_INIT(ACPI_TABLES),
  41         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  42         ACPI_DEBUG_INIT(ACPI_PARSER),
  43         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  44         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  45         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  46         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  47         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  48         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  49         ACPI_DEBUG_INIT(ACPI_COMPILER),
  50         ACPI_DEBUG_INIT(ACPI_TOOLS),
  51 };
  52
  53 static const struct acpi_dlevel acpi_debug_levels[] = {
  54         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  55         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  56         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  57         ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
  58         ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
  59
  60         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  61         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  62         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  63         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  64         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  65         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  66         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  67         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  68         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  69         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  70         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  71         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  72         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  73         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  74
  75         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  76         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  77         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  78
  79         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  80         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  81         ACPI_DEBUG_INIT(ACPI_LV_IO),
  82         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  83
  84         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  85         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  86         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  87         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  88 };
  89
  90 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
  91 {
  92         int result = 0;
  93         int i;
  94
  95         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
  96
  97         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
  98                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
  99                                   acpi_debug_layers[i].name,
 100                                   acpi_debug_layers[i].value,
 101                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
 102                                   ? '*' : ' ');
 103         }
 104         result +=
 105             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 106                     ACPI_ALL_DRIVERS,
 107                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 108                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
 109                     == 0 ? ' ' : '-');
 110         result +=
 111             sprintf(buffer + result,
 112                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
 113                     acpi_dbg_layer);
 114
 115         return result;
 116 }
 117
 118 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 119 {
 120         int result = 0;
 121         int i;
 122
 123         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 124
 125         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 126                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 127                                   acpi_debug_levels[i].name,
 128                                   acpi_debug_levels[i].value,
 129                                   (acpi_dbg_level & acpi_debug_levels[i].value)
 130                                   ? '*' : ' ');
 131         }
 132         result +=
 133             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 134                     acpi_dbg_level);
 135
 136         return result;
 137 }
 138
 139 static const struct kernel_param_ops param_ops_debug_layer = {
 140         .set = param_set_uint,
 141         .get = param_get_debug_layer,
 142 };
 143
 144 static const struct kernel_param_ops param_ops_debug_level = {
 145         .set = param_set_uint,
 146         .get = param_get_debug_level,
 147 };
 148
 149 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 150 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 151
 152 static char trace_method_name[1024];
 153
 154 static int param_set_trace_method_name(const char *val,
 155                                        const struct kernel_param *kp)
 156 {
 157         u32 saved_flags = 0;
 158         bool is_abs_path = true;
 159
 160         if (*val != '\\')
 161                 is_abs_path = false;
 162
 163         if ((is_abs_path && strlen(val) > 1023) ||
 164             (!is_abs_path && strlen(val) > 1022)) {
 165                 pr_err("%s: string parameter too long\n", kp->name);
 166                 return -ENOSPC;
 167         }
 168
 169         /*
 170          * It's not safe to update acpi_gbl_trace_method_name without
 171          * having the tracer stopped, so we save the original tracer
 172          * state and disable it.
 173          */
 174         saved_flags = acpi_gbl_trace_flags;
 175         (void)acpi_debug_trace(NULL,
 176                                acpi_gbl_trace_dbg_level,
 177                                acpi_gbl_trace_dbg_layer,
 178                                0);
 179
 180         /* This is a hack.  We can't kmalloc in early boot. */
 181         if (is_abs_path)
 182                 strcpy(trace_method_name, val);
 183         else {
 184                 trace_method_name[0] = '\\';
 185                 strcpy(trace_method_name+1, val);
 186         }
 187
 188         /* Restore the original tracer state */
 189         (void)acpi_debug_trace(trace_method_name,
 190                                acpi_gbl_trace_dbg_level,
 191                                acpi_gbl_trace_dbg_layer,
 192                                saved_flags);
 193
 194         return 0;
 195 }
 196
 197 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
 198 {
 199         return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
 200 }
 201
 202 static const struct kernel_param_ops param_ops_trace_method = {
 203         .set = param_set_trace_method_name,
 204         .get = param_get_trace_method_name,
 205 };
 206
 207 static const struct kernel_param_ops param_ops_trace_attrib = {
 208         .set = param_set_uint,
 209         .get = param_get_uint,
 210 };
 211
 212 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
 213 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 214 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 215
 216 static int param_set_trace_state(const char *val,
 217                                  const struct kernel_param *kp)
 218 {
 219         acpi_status status;
 220         const char *method = trace_method_name;
 221         u32 flags = 0;
 222
 223 /* So "xxx-once" comparison should go prior than "xxx" comparison */
 224 #define acpi_compare_param(val, key)    \
 225         strncmp((val), (key), sizeof(key) - 1)
 226
 227         if (!acpi_compare_param(val, "enable")) {
 228                 method = NULL;
 229                 flags = ACPI_TRACE_ENABLED;
 230         } else if (!acpi_compare_param(val, "disable"))
 231                 method = NULL;
 232         else if (!acpi_compare_param(val, "method-once"))
 233                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
 234         else if (!acpi_compare_param(val, "method"))
 235                 flags = ACPI_TRACE_ENABLED;
 236         else if (!acpi_compare_param(val, "opcode-once"))
 237                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
 238         else if (!acpi_compare_param(val, "opcode"))
 239                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
 240         else
 241                 return -EINVAL;
 242
 243         status = acpi_debug_trace(method,
 244                                   acpi_gbl_trace_dbg_level,
 245                                   acpi_gbl_trace_dbg_layer,
 246                                   flags);
 247         if (ACPI_FAILURE(status))
 248                 return -EBUSY;
 249
 250         return 0;
 251 }
 252
 253 static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
 254 {
 255         if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
 256                 return sprintf(buffer, "disable\n");
 257         else {
 258                 if (acpi_gbl_trace_method_name) {
 259                         if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
 260                                 return sprintf(buffer, "method-once\n");
 261                         else
 262                                 return sprintf(buffer, "method\n");
 263                 } else
 264                         return sprintf(buffer, "enable\n");
 265         }
 266         return 0;
 267 }
 268
 269 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 270                   NULL, 0644);
 271 #endif /* CONFIG_ACPI_DEBUG */
 272
 273
 274 /* /sys/modules/acpi/parameters/aml_debug_output */
 275
 276 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 277                    byte, 0644);
 278 MODULE_PARM_DESC(aml_debug_output,
 279                  "To enable/disable the ACPI Debug Object output.");
 280
 281 /* /sys/module/acpi/parameters/acpica_version */
 282 static int param_get_acpica_version(char *buffer,
 283                                     const struct kernel_param *kp)
 284 {
 285         int result;
 286
 287         result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
 288
 289         return result;
 290 }
 291
 292 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
 293
 294 /*
 295  * ACPI table sysfs I/F:
 296  * /sys/firmware/acpi/tables/
 297  * /sys/firmware/acpi/tables/data/
 298  * /sys/firmware/acpi/tables/dynamic/
 299  */
 300
 301 static LIST_HEAD(acpi_table_attr_list);
 302 static struct kobject *tables_kobj;
 303 static struct kobject *tables_data_kobj;
 304 static struct kobject *dynamic_tables_kobj;
 305 static struct kobject *hotplug_kobj;
 306
 307 #define ACPI_MAX_TABLE_INSTANCES        999
 308 #define ACPI_INST_SIZE                  4 /* including trailing 0 */
 309
 310 struct acpi_table_attr {
 311         struct bin_attribute attr;
 312         char name[ACPI_NAMESEG_SIZE];
 313         int instance;
 314         char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
 315         struct list_head node;
 316 };
 317
 318 struct acpi_data_attr {
 319         struct bin_attribute attr;
 320         u64     addr;
 321 };
 322
 323 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
 324                                struct bin_attribute *bin_attr, char *buf,
 325                                loff_t offset, size_t count)
 326 {
 327         struct acpi_table_attr *table_attr =
 328             container_of(bin_attr, struct acpi_table_attr, attr);
 329         struct acpi_table_header *table_header = NULL;
 330         acpi_status status;
 331         ssize_t rc;
 332
 333         status = acpi_get_table(table_attr->name, table_attr->instance,
 334                                 &table_header);
 335         if (ACPI_FAILURE(status))
 336                 return -ENODEV;
 337
 338         rc = memory_read_from_buffer(buf, count, &offset, table_header,
 339                         table_header->length);
 340         acpi_put_table(table_header);
 341         return rc;
 342 }
 343
 344 static int acpi_table_attr_init(struct kobject *tables_obj,
 345                                 struct acpi_table_attr *table_attr,
 346                                 struct acpi_table_header *table_header)
 347 {
 348         struct acpi_table_header *header = NULL;
 349         struct acpi_table_attr *attr = NULL;
 350         char instance_str[ACPI_INST_SIZE];
 351
 352         sysfs_attr_init(&table_attr->attr.attr);
 353         ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
 354
 355         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 356                 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
 357                         if (table_attr->instance < attr->instance)
 358                                 table_attr->instance = attr->instance;
 359         }
 360         table_attr->instance++;
 361         if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
 362                 pr_warn("%4.4s: too many table instances\n",
 363                         table_attr->name);
 364                 return -ERANGE;
 365         }
 366
 367         ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
 368         table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
 369         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 370                                          !acpi_get_table
 371                                          (table_header->signature, 2, &header))) {
 372                 snprintf(instance_str, sizeof(instance_str), "%u",
 373                          table_attr->instance);
 374                 strcat(table_attr->filename, instance_str);
 375         }
 376
 377         table_attr->attr.size = table_header->length;
 378         table_attr->attr.read = acpi_table_show;
 379         table_attr->attr.attr.name = table_attr->filename;
 380         table_attr->attr.attr.mode = 0400;
 381
 382         return sysfs_create_bin_file(tables_obj, &table_attr->attr);
 383 }
 384
 385 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
 386 {
 387         struct acpi_table_attr *table_attr;
 388
 389         switch (event) {
 390         case ACPI_TABLE_EVENT_INSTALL:
 391                 table_attr =
 392                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 393                 if (!table_attr)
 394                         return AE_NO_MEMORY;
 395
 396                 if (acpi_table_attr_init(dynamic_tables_kobj,
 397                                          table_attr, table)) {
 398                         kfree(table_attr);
 399                         return AE_ERROR;
 400                 }
 401                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 402                 break;
 403         case ACPI_TABLE_EVENT_LOAD:
 404         case ACPI_TABLE_EVENT_UNLOAD:
 405         case ACPI_TABLE_EVENT_UNINSTALL:
 406                 /*
 407                  * we do not need to do anything right now
 408                  * because the table is not deleted from the
 409                  * global table list when unloading it.
 410                  */
 411                 break;
 412         default:
 413                 return AE_BAD_PARAMETER;
 414         }
 415         return AE_OK;
 416 }
 417
 418 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
 419                               struct bin_attribute *bin_attr, char *buf,
 420                               loff_t offset, size_t count)
 421 {
 422         struct acpi_data_attr *data_attr;
 423         void __iomem *base;
 424         ssize_t rc;
 425
 426         data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
 427
 428         base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
 429         if (!base)
 430                 return -ENOMEM;
 431         rc = memory_read_from_buffer(buf, count, &offset, base,
 432                                      data_attr->attr.size);
 433         acpi_os_unmap_memory(base, data_attr->attr.size);
 434
 435         return rc;
 436 }
 437
 438 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
 439 {
 440         struct acpi_table_bert *bert = th;
 441
 442         if (bert->header.length < sizeof(struct acpi_table_bert) ||
 443             bert->region_length < sizeof(struct acpi_hest_generic_status)) {
 444                 kfree(data_attr);
 445                 return -EINVAL;
 446         }
 447         data_attr->addr = bert->address;
 448         data_attr->attr.size = bert->region_length;
 449         data_attr->attr.attr.name = "BERT";
 450
 451         return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
 452 }
 453
 454 static struct acpi_data_obj {
 455         char *name;
 456         int (*fn)(void *, struct acpi_data_attr *);
 457 } acpi_data_objs[] = {
 458         { ACPI_SIG_BERT, acpi_bert_data_init },
 459 };
 460
 461 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
 462
 463 static int acpi_table_data_init(struct acpi_table_header *th)
 464 {
 465         struct acpi_data_attr *data_attr;
 466         int i;
 467
 468         for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
 469                 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
 470                         data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
 471                         if (!data_attr)
 472                                 return -ENOMEM;
 473                         sysfs_attr_init(&data_attr->attr.attr);
 474                         data_attr->attr.read = acpi_data_show;
 475                         data_attr->attr.attr.mode = 0400;
 476                         return acpi_data_objs[i].fn(th, data_attr);
 477                 }
 478         }
 479         return 0;
 480 }
 481
 482 static int acpi_tables_sysfs_init(void)
 483 {
 484         struct acpi_table_attr *table_attr;
 485         struct acpi_table_header *table_header = NULL;
 486         int table_index;
 487         acpi_status status;
 488         int ret;
 489
 490         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 491         if (!tables_kobj)
 492                 goto err;
 493
 494         tables_data_kobj = kobject_create_and_add("data", tables_kobj);
 495         if (!tables_data_kobj)
 496                 goto err_tables_data;
 497
 498         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 499         if (!dynamic_tables_kobj)
 500                 goto err_dynamic_tables;
 501
 502         for (table_index = 0;; table_index++) {
 503                 status = acpi_get_table_by_index(table_index, &table_header);
 504
 505                 if (status == AE_BAD_PARAMETER)
 506                         break;
 507
 508                 if (ACPI_FAILURE(status))
 509                         continue;
 510
 511                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
 512                 if (!table_attr)
 513                         return -ENOMEM;
 514
 515                 ret = acpi_table_attr_init(tables_kobj,
 516                                            table_attr, table_header);
 517                 if (ret) {
 518                         kfree(table_attr);
 519                         return ret;
 520                 }
 521                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 522                 acpi_table_data_init(table_header);
 523         }
 524
 525         kobject_uevent(tables_kobj, KOBJ_ADD);
 526         kobject_uevent(tables_data_kobj, KOBJ_ADD);
 527         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 528
 529         return 0;
 530 err_dynamic_tables:
 531         kobject_put(tables_data_kobj);
 532 err_tables_data:
 533         kobject_put(tables_kobj);
 534 err:
 535         return -ENOMEM;
 536 }
 537
 538 /*
 539  * Detailed ACPI IRQ counters:
 540  * /sys/firmware/acpi/interrupts/
 541  */
 542
 543 u32 acpi_irq_handled;
 544 u32 acpi_irq_not_handled;
 545
 546 #define COUNT_GPE 0
 547 #define COUNT_SCI 1             /* acpi_irq_handled */
 548 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
 549 #define COUNT_ERROR 3           /* other */
 550 #define NUM_COUNTERS_EXTRA 4
 551
 552 struct event_counter {
 553         u32 count;
 554         u32 flags;
 555 };
 556
 557 static struct event_counter *all_counters;
 558 static u32 num_gpes;
 559 static u32 num_counters;
 560 static struct attribute **all_attrs;
 561 static u32 acpi_gpe_count;
 562
 563 static struct attribute_group interrupt_stats_attr_group = {
 564         .name = "interrupts",
 565 };
 566
 567 static struct kobj_attribute *counter_attrs;
 568
 569 static void delete_gpe_attr_array(void)
 570 {
 571         struct event_counter *tmp = all_counters;
 572
 573         all_counters = NULL;
 574         kfree(tmp);
 575
 576         if (counter_attrs) {
 577                 int i;
 578
 579                 for (i = 0; i < num_gpes; i++)
 580                         kfree(counter_attrs[i].attr.name);
 581
 582                 kfree(counter_attrs);
 583         }
 584         kfree(all_attrs);
 585
 586         return;
 587 }
 588
 589 static void gpe_count(u32 gpe_number)
 590 {
 591         acpi_gpe_count++;
 592
 593         if (!all_counters)
 594                 return;
 595
 596         if (gpe_number < num_gpes)
 597                 all_counters[gpe_number].count++;
 598         else
 599                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 600                              COUNT_ERROR].count++;
 601
 602         return;
 603 }
 604
 605 static void fixed_event_count(u32 event_number)
 606 {
 607         if (!all_counters)
 608                 return;
 609
 610         if (event_number < ACPI_NUM_FIXED_EVENTS)
 611                 all_counters[num_gpes + event_number].count++;
 612         else
 613                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 614                              COUNT_ERROR].count++;
 615
 616         return;
 617 }
 618
 619 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
 620         u32 event_number, void *context)
 621 {
 622         if (event_type == ACPI_EVENT_TYPE_GPE) {
 623                 gpe_count(event_number);
 624                 pr_debug("GPE event 0x%02x\n", event_number);
 625         } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
 626                 fixed_event_count(event_number);
 627                 pr_debug("Fixed event 0x%02x\n", event_number);
 628         } else {
 629                 pr_debug("Other event 0x%02x\n", event_number);
 630         }
 631 }
 632
 633 static int get_status(u32 index, acpi_event_status *ret,
 634                       acpi_handle *handle)
 635 {
 636         acpi_status status;
 637
 638         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 639                 return -EINVAL;
 640
 641         if (index < num_gpes) {
 642                 status = acpi_get_gpe_device(index, handle);
 643                 if (ACPI_FAILURE(status)) {
 644                         pr_warn("Invalid GPE 0x%x", index);
 645                         return -ENXIO;
 646                 }
 647                 status = acpi_get_gpe_status(*handle, index, ret);
 648         } else {
 649                 status = acpi_get_event_status(index - num_gpes, ret);
 650         }
 651         if (ACPI_FAILURE(status))
 652                 return -EIO;
 653
 654         return 0;
 655 }
 656
 657 static ssize_t counter_show(struct kobject *kobj,
 658                             struct kobj_attribute *attr, char *buf)
 659 {
 660         int index = attr - counter_attrs;
 661         int size;
 662         acpi_handle handle;
 663         acpi_event_status status;
 664         int result = 0;
 665
 666         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 667             acpi_irq_handled;
 668         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 669             acpi_irq_not_handled;
 670         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 671             acpi_gpe_count;
 672         size = sprintf(buf, "%8u", all_counters[index].count);
 673
 674         /* "gpe_all" or "sci" */
 675         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 676                 goto end;
 677
 678         result = get_status(index, &status, &handle);
 679         if (result)
 680                 goto end;
 681
 682         if (status & ACPI_EVENT_FLAG_ENABLE_SET)
 683                 size += sprintf(buf + size, "  EN");
 684         else
 685                 size += sprintf(buf + size, "    ");
 686         if (status & ACPI_EVENT_FLAG_STATUS_SET)
 687                 size += sprintf(buf + size, " STS");
 688         else
 689                 size += sprintf(buf + size, "    ");
 690
 691         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
 692                 size += sprintf(buf + size, " invalid     ");
 693         else if (status & ACPI_EVENT_FLAG_ENABLED)
 694                 size += sprintf(buf + size, " enabled     ");
 695         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 696                 size += sprintf(buf + size, " wake_enabled");
 697         else
 698                 size += sprintf(buf + size, " disabled    ");
 699         if (status & ACPI_EVENT_FLAG_MASKED)
 700                 size += sprintf(buf + size, " masked  ");
 701         else
 702                 size += sprintf(buf + size, " unmasked");
 703
 704 end:
 705         size += sprintf(buf + size, "\n");
 706         return result ? result : size;
 707 }
 708
 709 /*
 710  * counter_set() sets the specified counter.
 711  * setting the total "sci" file to any value clears all counters.
 712  * enable/disable/clear a gpe/fixed event in user space.
 713  */
 714 static ssize_t counter_set(struct kobject *kobj,
 715                            struct kobj_attribute *attr, const char *buf,
 716                            size_t size)
 717 {
 718         int index = attr - counter_attrs;
 719         acpi_event_status status;
 720         acpi_handle handle;
 721         int result = 0;
 722         unsigned long tmp;
 723
 724         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 725                 int i;
 726                 for (i = 0; i < num_counters; ++i)
 727                         all_counters[i].count = 0;
 728                 acpi_gpe_count = 0;
 729                 acpi_irq_handled = 0;
 730                 acpi_irq_not_handled = 0;
 731                 goto end;
 732         }
 733
 734         /* show the event status for both GPEs and Fixed Events */
 735         result = get_status(index, &status, &handle);
 736         if (result)
 737                 goto end;
 738
 739         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
 740                 printk(KERN_WARNING PREFIX
 741                        "Can not change Invalid GPE/Fixed Event status\n");
 742                 return -EINVAL;
 743         }
 744
 745         if (index < num_gpes) {
 746                 if (!strcmp(buf, "disable\n") &&
 747                     (status & ACPI_EVENT_FLAG_ENABLED))
 748                         result = acpi_disable_gpe(handle, index);
 749                 else if (!strcmp(buf, "enable\n") &&
 750                          !(status & ACPI_EVENT_FLAG_ENABLED))
 751                         result = acpi_enable_gpe(handle, index);
 752                 else if (!strcmp(buf, "clear\n") &&
 753                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 754                         result = acpi_clear_gpe(handle, index);
 755                 else if (!strcmp(buf, "mask\n"))
 756                         result = acpi_mask_gpe(handle, index, TRUE);
 757                 else if (!strcmp(buf, "unmask\n"))
 758                         result = acpi_mask_gpe(handle, index, FALSE);
 759                 else if (!kstrtoul(buf, 0, &tmp))
 760                         all_counters[index].count = tmp;
 761                 else
 762                         result = -EINVAL;
 763         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 764                 int event = index - num_gpes;
 765                 if (!strcmp(buf, "disable\n") &&
 766                     (status & ACPI_EVENT_FLAG_ENABLE_SET))
 767                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 768                 else if (!strcmp(buf, "enable\n") &&
 769                          !(status & ACPI_EVENT_FLAG_ENABLE_SET))
 770                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 771                 else if (!strcmp(buf, "clear\n") &&
 772                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 773                         result = acpi_clear_event(event);
 774                 else if (!kstrtoul(buf, 0, &tmp))
 775                         all_counters[index].count = tmp;
 776                 else
 777                         result = -EINVAL;
 778         } else
 779                 all_counters[index].count = strtoul(buf, NULL, 0);
 780
 781         if (ACPI_FAILURE(result))
 782                 result = -EINVAL;
 783 end:
 784         return result ? result : size;
 785 }
 786
 787 /*
 788  * A Quirk Mechanism for GPE Flooding Prevention:
 789  *
 790  * Quirks may be needed to prevent GPE flooding on a specific GPE. The
 791  * flooding typically cannot be detected and automatically prevented by
 792  * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
 793  * the AML tables. This normally indicates a feature gap in Linux, thus
 794  * instead of providing endless quirk tables, we provide a boot parameter
 795  * for those who want this quirk. For example, if the users want to prevent
 796  * the GPE flooding for GPE 00, they need to specify the following boot
 797  * parameter:
 798  *   acpi_mask_gpe=0x00
 799  * The masking status can be modified by the following runtime controlling
 800  * interface:
 801  *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
 802  */
 803 #define ACPI_MASKABLE_GPE_MAX   0x100
 804 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
 805
 806 static int __init acpi_gpe_set_masked_gpes(char *val)
 807 {
 808         u8 gpe;
 809
 810         if (kstrtou8(val, 0, &gpe))
 811                 return -EINVAL;
 812         set_bit(gpe, acpi_masked_gpes_map);
 813
 814         return 1;
 815 }
 816 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
 817
 818 void __init acpi_gpe_apply_masked_gpes(void)
 819 {
 820         acpi_handle handle;
 821         acpi_status status;
 822         u16 gpe;
 823
 824         for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
 825                 status = acpi_get_gpe_device(gpe, &handle);
 826                 if (ACPI_SUCCESS(status)) {
 827                         pr_info("Masking GPE 0x%x.\n", gpe);
 828                         (void)acpi_mask_gpe(handle, gpe, TRUE);
 829                 }
 830         }
 831 }
 832
 833 void acpi_irq_stats_init(void)
 834 {
 835         acpi_status status;
 836         int i;
 837
 838         if (all_counters)
 839                 return;
 840
 841         num_gpes = acpi_current_gpe_count;
 842         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 843
 844         all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
 845                             GFP_KERNEL);
 846         if (all_attrs == NULL)
 847                 return;
 848
 849         all_counters = kcalloc(num_counters, sizeof(struct event_counter),
 850                                GFP_KERNEL);
 851         if (all_counters == NULL)
 852                 goto fail;
 853
 854         status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
 855         if (ACPI_FAILURE(status))
 856                 goto fail;
 857
 858         counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
 859                                 GFP_KERNEL);
 860         if (counter_attrs == NULL)
 861                 goto fail;
 862
 863         for (i = 0; i < num_counters; ++i) {
 864                 char buffer[12];
 865                 char *name;
 866
 867                 if (i < num_gpes)
 868                         sprintf(buffer, "gpe%02X", i);
 869                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 870                         sprintf(buffer, "ff_pmtimer");
 871                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 872                         sprintf(buffer, "ff_gbl_lock");
 873                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 874                         sprintf(buffer, "ff_pwr_btn");
 875                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 876                         sprintf(buffer, "ff_slp_btn");
 877                 else if (i == num_gpes + ACPI_EVENT_RTC)
 878                         sprintf(buffer, "ff_rt_clk");
 879                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 880                         sprintf(buffer, "gpe_all");
 881                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 882                         sprintf(buffer, "sci");
 883                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 884                         sprintf(buffer, "sci_not");
 885                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 886                         sprintf(buffer, "error");
 887                 else
 888                         sprintf(buffer, "bug%02X", i);
 889
 890                 name = kstrdup(buffer, GFP_KERNEL);
 891                 if (name == NULL)
 892                         goto fail;
 893
 894                 sysfs_attr_init(&counter_attrs[i].attr);
 895                 counter_attrs[i].attr.name = name;
 896                 counter_attrs[i].attr.mode = 0644;
 897                 counter_attrs[i].show = counter_show;
 898                 counter_attrs[i].store = counter_set;
 899
 900                 all_attrs[i] = &counter_attrs[i].attr;
 901         }
 902
 903         interrupt_stats_attr_group.attrs = all_attrs;
 904         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 905                 return;
 906
 907 fail:
 908         delete_gpe_attr_array();
 909         return;
 910 }
 911
 912 static void __exit interrupt_stats_exit(void)
 913 {
 914         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 915
 916         delete_gpe_attr_array();
 917
 918         return;
 919 }
 920
 921 static ssize_t
 922 acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
 923                   char *buf)
 924 {
 925         return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
 926 }
 927
 928 static const struct kobj_attribute pm_profile_attr =
 929         __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
 930
 931 static ssize_t hotplug_enabled_show(struct kobject *kobj,
 932                                     struct kobj_attribute *attr, char *buf)
 933 {
 934         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 935
 936         return sprintf(buf, "%d\n", hotplug->enabled);
 937 }
 938
 939 static ssize_t hotplug_enabled_store(struct kobject *kobj,
 940                                      struct kobj_attribute *attr,
 941                                      const char *buf, size_t size)
 942 {
 943         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 944         unsigned int val;
 945
 946         if (kstrtouint(buf, 10, &val) || val > 1)
 947                 return -EINVAL;
 948
 949         acpi_scan_hotplug_enabled(hotplug, val);
 950         return size;
 951 }
 952
 953 static struct kobj_attribute hotplug_enabled_attr =
 954         __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
 955                 hotplug_enabled_store);
 956
 957 static struct attribute *hotplug_profile_attrs[] = {
 958         &hotplug_enabled_attr.attr,
 959         NULL
 960 };
 961
 962 static struct kobj_type acpi_hotplug_profile_ktype = {
 963         .sysfs_ops = &kobj_sysfs_ops,
 964         .default_attrs = hotplug_profile_attrs,
 965 };
 966
 967 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
 968                                     const char *name)
 969 {
 970         int error;
 971
 972         if (!hotplug_kobj)
 973                 goto err_out;
 974
 975         error = kobject_init_and_add(&hotplug->kobj,
 976                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
 977         if (error) {
 978                 kobject_put(&hotplug->kobj);
 979                 goto err_out;
 980         }
 981
 982         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
 983         return;
 984
 985  err_out:
 986         pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
 987 }
 988
 989 static ssize_t force_remove_show(struct kobject *kobj,
 990                                  struct kobj_attribute *attr, char *buf)
 991 {
 992         return sprintf(buf, "%d\n", 0);
 993 }
 994
 995 static ssize_t force_remove_store(struct kobject *kobj,
 996                                   struct kobj_attribute *attr,
 997                                   const char *buf, size_t size)
 998 {
 999         bool val;
1000         int ret;
1001
1002         ret = strtobool(buf, &val);
1003         if (ret < 0)
1004                 return ret;
1005
1006         if (val) {
1007                 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1008                 return -EINVAL;
1009         }
1010         return size;
1011 }
1012
1013 static const struct kobj_attribute force_remove_attr =
1014         __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1015                force_remove_store);
1016
1017 int __init acpi_sysfs_init(void)
1018 {
1019         int result;
1020
1021         result = acpi_tables_sysfs_init();
1022         if (result)
1023                 return result;
1024
1025         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1026         if (!hotplug_kobj)
1027                 return -ENOMEM;
1028
1029         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1030         if (result)
1031                 return result;
1032
1033         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1034         return result;
1035 }