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 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  16 ACPI_MODULE_NAME("sysfs");
  17
  18 #ifdef CONFIG_ACPI_DEBUG
  19 /*
  20  * ACPI debug sysfs I/F, including:
  21  * /sys/modules/acpi/parameters/debug_layer
  22  * /sys/modules/acpi/parameters/debug_level
  23  * /sys/modules/acpi/parameters/trace_method_name
  24  * /sys/modules/acpi/parameters/trace_state
  25  * /sys/modules/acpi/parameters/trace_debug_layer
  26  * /sys/modules/acpi/parameters/trace_debug_level
  27  */
  28
  29 struct acpi_dlayer {
  30         const char *name;
  31         unsigned long value;
  32 };
  33 struct acpi_dlevel {
  34         const char *name;
  35         unsigned long value;
  36 };
  37 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  38
  39 static const struct acpi_dlayer acpi_debug_layers[] = {
  40         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  41         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  42         ACPI_DEBUG_INIT(ACPI_EVENTS),
  43         ACPI_DEBUG_INIT(ACPI_TABLES),
  44         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  45         ACPI_DEBUG_INIT(ACPI_PARSER),
  46         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  47         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  48         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  49         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  50         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  51         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  52         ACPI_DEBUG_INIT(ACPI_COMPILER),
  53         ACPI_DEBUG_INIT(ACPI_TOOLS),
  54
  55         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
  56         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
  57         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
  58         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
  59         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
  60         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
  61         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
  62         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
  63         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
  64         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
  65         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
  66         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
  67         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
  68         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
  69 };
  70
  71 static const struct acpi_dlevel acpi_debug_levels[] = {
  72         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  73         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  74         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  75         ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
  76         ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
  77
  78         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  79         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  80         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  81         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  82         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  83         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  84         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  85         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  86         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  87         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  88         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  89         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  90         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  91         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  92
  93         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  94         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  95         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  96
  97         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  98         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  99         ACPI_DEBUG_INIT(ACPI_LV_IO),
 100         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
 101
 102         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
 103         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
 104         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
 105         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
 106 };
 107
 108 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
 109 {
 110         int result = 0;
 111         int i;
 112
 113         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 114
 115         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 116                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 117                                   acpi_debug_layers[i].name,
 118                                   acpi_debug_layers[i].value,
 119                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
 120                                   ? '*' : ' ');
 121         }
 122         result +=
 123             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 124                     ACPI_ALL_DRIVERS,
 125                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 126                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
 127                     == 0 ? ' ' : '-');
 128         result +=
 129             sprintf(buffer + result,
 130                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
 131                     acpi_dbg_layer);
 132
 133         return result;
 134 }
 135
 136 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 137 {
 138         int result = 0;
 139         int i;
 140
 141         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 142
 143         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 144                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 145                                   acpi_debug_levels[i].name,
 146                                   acpi_debug_levels[i].value,
 147                                   (acpi_dbg_level & acpi_debug_levels[i].value)
 148                                   ? '*' : ' ');
 149         }
 150         result +=
 151             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 152                     acpi_dbg_level);
 153
 154         return result;
 155 }
 156
 157 static const struct kernel_param_ops param_ops_debug_layer = {
 158         .set = param_set_uint,
 159         .get = param_get_debug_layer,
 160 };
 161
 162 static const struct kernel_param_ops param_ops_debug_level = {
 163         .set = param_set_uint,
 164         .get = param_get_debug_level,
 165 };
 166
 167 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 168 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 169
 170 static char trace_method_name[1024];
 171
 172 int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
 173 {
 174         u32 saved_flags = 0;
 175         bool is_abs_path = true;
 176
 177         if (*val != '\\')
 178                 is_abs_path = false;
 179
 180         if ((is_abs_path && strlen(val) > 1023) ||
 181             (!is_abs_path && strlen(val) > 1022)) {
 182                 pr_err("%s: string parameter too long\n", kp->name);
 183                 return -ENOSPC;
 184         }
 185
 186         /*
 187          * It's not safe to update acpi_gbl_trace_method_name without
 188          * having the tracer stopped, so we save the original tracer
 189          * state and disable it.
 190          */
 191         saved_flags = acpi_gbl_trace_flags;
 192         (void)acpi_debug_trace(NULL,
 193                                acpi_gbl_trace_dbg_level,
 194                                acpi_gbl_trace_dbg_layer,
 195                                0);
 196
 197         /* This is a hack.  We can't kmalloc in early boot. */
 198         if (is_abs_path)
 199                 strcpy(trace_method_name, val);
 200         else {
 201                 trace_method_name[0] = '\\';
 202                 strcpy(trace_method_name+1, val);
 203         }
 204
 205         /* Restore the original tracer state */
 206         (void)acpi_debug_trace(trace_method_name,
 207                                acpi_gbl_trace_dbg_level,
 208                                acpi_gbl_trace_dbg_layer,
 209                                saved_flags);
 210
 211         return 0;
 212 }
 213
 214 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
 215 {
 216         return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
 217 }
 218
 219 static const struct kernel_param_ops param_ops_trace_method = {
 220         .set = param_set_trace_method_name,
 221         .get = param_get_trace_method_name,
 222 };
 223
 224 static const struct kernel_param_ops param_ops_trace_attrib = {
 225         .set = param_set_uint,
 226         .get = param_get_uint,
 227 };
 228
 229 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
 230 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 231 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 232
 233 static int param_set_trace_state(const char *val, struct kernel_param *kp)
 234 {
 235         acpi_status status;
 236         const char *method = trace_method_name;
 237         u32 flags = 0;
 238
 239 /* So "xxx-once" comparison should go prior than "xxx" comparison */
 240 #define acpi_compare_param(val, key)    \
 241         strncmp((val), (key), sizeof(key) - 1)
 242
 243         if (!acpi_compare_param(val, "enable")) {
 244                 method = NULL;
 245                 flags = ACPI_TRACE_ENABLED;
 246         } else if (!acpi_compare_param(val, "disable"))
 247                 method = NULL;
 248         else if (!acpi_compare_param(val, "method-once"))
 249                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
 250         else if (!acpi_compare_param(val, "method"))
 251                 flags = ACPI_TRACE_ENABLED;
 252         else if (!acpi_compare_param(val, "opcode-once"))
 253                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
 254         else if (!acpi_compare_param(val, "opcode"))
 255                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
 256         else
 257                 return -EINVAL;
 258
 259         status = acpi_debug_trace(method,
 260                                   acpi_gbl_trace_dbg_level,
 261                                   acpi_gbl_trace_dbg_layer,
 262                                   flags);
 263         if (ACPI_FAILURE(status))
 264                 return -EBUSY;
 265
 266         return 0;
 267 }
 268
 269 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
 270 {
 271         if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
 272                 return sprintf(buffer, "disable");
 273         else {
 274                 if (acpi_gbl_trace_method_name) {
 275                         if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
 276                                 return sprintf(buffer, "method-once");
 277                         else
 278                                 return sprintf(buffer, "method");
 279                 } else
 280                         return sprintf(buffer, "enable");
 281         }
 282         return 0;
 283 }
 284
 285 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 286                   NULL, 0644);
 287 #endif /* CONFIG_ACPI_DEBUG */
 288
 289
 290 /* /sys/modules/acpi/parameters/aml_debug_output */
 291
 292 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 293                    byte, 0644);
 294 MODULE_PARM_DESC(aml_debug_output,
 295                  "To enable/disable the ACPI Debug Object output.");
 296
 297 /* /sys/module/acpi/parameters/acpica_version */
 298 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
 299 {
 300         int result;
 301
 302         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
 303
 304         return result;
 305 }
 306
 307 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
 308
 309 /*
 310  * ACPI table sysfs I/F:
 311  * /sys/firmware/acpi/tables/
 312  * /sys/firmware/acpi/tables/data/
 313  * /sys/firmware/acpi/tables/dynamic/
 314  */
 315
 316 static LIST_HEAD(acpi_table_attr_list);
 317 static struct kobject *tables_kobj;
 318 static struct kobject *tables_data_kobj;
 319 static struct kobject *dynamic_tables_kobj;
 320 static struct kobject *hotplug_kobj;
 321
 322 #define ACPI_MAX_TABLE_INSTANCES        999
 323 #define ACPI_INST_SIZE                  4 /* including trailing 0 */
 324
 325 struct acpi_table_attr {
 326         struct bin_attribute attr;
 327         char name[ACPI_NAME_SIZE];
 328         int instance;
 329         char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
 330         struct list_head node;
 331 };
 332
 333 struct acpi_data_attr {
 334         struct bin_attribute attr;
 335         u64     addr;
 336 };
 337
 338 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
 339                                struct bin_attribute *bin_attr, char *buf,
 340                                loff_t offset, size_t count)
 341 {
 342         struct acpi_table_attr *table_attr =
 343             container_of(bin_attr, struct acpi_table_attr, attr);
 344         struct acpi_table_header *table_header = NULL;
 345         acpi_status status;
 346         ssize_t rc;
 347
 348         status = acpi_get_table(table_attr->name, table_attr->instance,
 349                                 &table_header);
 350         if (ACPI_FAILURE(status))
 351                 return -ENODEV;
 352
 353         rc = memory_read_from_buffer(buf, count, &offset, table_header,
 354                         table_header->length);
 355         acpi_put_table(table_header);
 356         return rc;
 357 }
 358
 359 static int acpi_table_attr_init(struct kobject *tables_obj,
 360                                 struct acpi_table_attr *table_attr,
 361                                 struct acpi_table_header *table_header)
 362 {
 363         struct acpi_table_header *header = NULL;
 364         struct acpi_table_attr *attr = NULL;
 365         char instance_str[ACPI_INST_SIZE];
 366
 367         sysfs_attr_init(&table_attr->attr.attr);
 368         ACPI_MOVE_NAME(table_attr->name, table_header->signature);
 369
 370         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 371                 if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
 372                         if (table_attr->instance < attr->instance)
 373                                 table_attr->instance = attr->instance;
 374         }
 375         table_attr->instance++;
 376         if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
 377                 pr_warn("%4.4s: too many table instances\n",
 378                         table_attr->name);
 379                 return -ERANGE;
 380         }
 381
 382         ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
 383         table_attr->filename[ACPI_NAME_SIZE] = '\0';
 384         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 385                                          !acpi_get_table
 386                                          (table_header->signature, 2, &header))) {
 387                 snprintf(instance_str, sizeof(instance_str), "%u",
 388                          table_attr->instance);
 389                 strcat(table_attr->filename, instance_str);
 390         }
 391
 392         table_attr->attr.size = table_header->length;
 393         table_attr->attr.read = acpi_table_show;
 394         table_attr->attr.attr.name = table_attr->filename;
 395         table_attr->attr.attr.mode = 0400;
 396
 397         return sysfs_create_bin_file(tables_obj, &table_attr->attr);
 398 }
 399
 400 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
 401 {
 402         struct acpi_table_attr *table_attr;
 403
 404         switch (event) {
 405         case ACPI_TABLE_EVENT_INSTALL:
 406                 table_attr =
 407                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 408                 if (!table_attr)
 409                         return AE_NO_MEMORY;
 410
 411                 if (acpi_table_attr_init(dynamic_tables_kobj,
 412                                          table_attr, table)) {
 413                         kfree(table_attr);
 414                         return AE_ERROR;
 415                 }
 416                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 417                 break;
 418         case ACPI_TABLE_EVENT_LOAD:
 419         case ACPI_TABLE_EVENT_UNLOAD:
 420         case ACPI_TABLE_EVENT_UNINSTALL:
 421                 /*
 422                  * we do not need to do anything right now
 423                  * because the table is not deleted from the
 424                  * global table list when unloading it.
 425                  */
 426                 break;
 427         default:
 428                 return AE_BAD_PARAMETER;
 429         }
 430         return AE_OK;
 431 }
 432
 433 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
 434                               struct bin_attribute *bin_attr, char *buf,
 435                               loff_t offset, size_t count)
 436 {
 437         struct acpi_data_attr *data_attr;
 438         void __iomem *base;
 439         ssize_t size;
 440
 441         data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
 442         size = data_attr->attr.size;
 443
 444         if (offset < 0)
 445                 return -EINVAL;
 446
 447         if (offset >= size)
 448                 return 0;
 449
 450         if (count > size - offset)
 451                 count = size - offset;
 452
 453         base = acpi_os_map_iomem(data_attr->addr, size);
 454         if (!base)
 455                 return -ENOMEM;
 456
 457         memcpy_fromio(buf, base + offset, count);
 458
 459         acpi_os_unmap_iomem(base, size);
 460
 461         return count;
 462 }
 463
 464 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
 465 {
 466         struct acpi_table_bert *bert = th;
 467
 468         if (bert->header.length < sizeof(struct acpi_table_bert) ||
 469             bert->region_length < sizeof(struct acpi_hest_generic_status)) {
 470                 kfree(data_attr);
 471                 return -EINVAL;
 472         }
 473         data_attr->addr = bert->address;
 474         data_attr->attr.size = bert->region_length;
 475         data_attr->attr.attr.name = "BERT";
 476
 477         return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
 478 }
 479
 480 static struct acpi_data_obj {
 481         char *name;
 482         int (*fn)(void *, struct acpi_data_attr *);
 483 } acpi_data_objs[] = {
 484         { ACPI_SIG_BERT, acpi_bert_data_init },
 485 };
 486
 487 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
 488
 489 static int acpi_table_data_init(struct acpi_table_header *th)
 490 {
 491         struct acpi_data_attr *data_attr;
 492         int i;
 493
 494         for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
 495                 if (ACPI_COMPARE_NAME(th->signature, acpi_data_objs[i].name)) {
 496                         data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
 497                         if (!data_attr)
 498                                 return -ENOMEM;
 499                         sysfs_attr_init(&data_attr->attr.attr);
 500                         data_attr->attr.read = acpi_data_show;
 501                         data_attr->attr.attr.mode = 0400;
 502                         return acpi_data_objs[i].fn(th, data_attr);
 503                 }
 504         }
 505         return 0;
 506 }
 507
 508 static int acpi_tables_sysfs_init(void)
 509 {
 510         struct acpi_table_attr *table_attr;
 511         struct acpi_table_header *table_header = NULL;
 512         int table_index;
 513         acpi_status status;
 514         int ret;
 515
 516         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 517         if (!tables_kobj)
 518                 goto err;
 519
 520         tables_data_kobj = kobject_create_and_add("data", tables_kobj);
 521         if (!tables_data_kobj)
 522                 goto err_tables_data;
 523
 524         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 525         if (!dynamic_tables_kobj)
 526                 goto err_dynamic_tables;
 527
 528         for (table_index = 0;; table_index++) {
 529                 status = acpi_get_table_by_index(table_index, &table_header);
 530
 531                 if (status == AE_BAD_PARAMETER)
 532                         break;
 533
 534                 if (ACPI_FAILURE(status))
 535                         continue;
 536
 537                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
 538                 if (!table_attr)
 539                         return -ENOMEM;
 540
 541                 ret = acpi_table_attr_init(tables_kobj,
 542                                            table_attr, table_header);
 543                 if (ret) {
 544                         kfree(table_attr);
 545                         return ret;
 546                 }
 547                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 548                 acpi_table_data_init(table_header);
 549         }
 550
 551         kobject_uevent(tables_kobj, KOBJ_ADD);
 552         kobject_uevent(tables_data_kobj, KOBJ_ADD);
 553         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 554
 555         return 0;
 556 err_dynamic_tables:
 557         kobject_put(tables_data_kobj);
 558 err_tables_data:
 559         kobject_put(tables_kobj);
 560 err:
 561         return -ENOMEM;
 562 }
 563
 564 /*
 565  * Detailed ACPI IRQ counters:
 566  * /sys/firmware/acpi/interrupts/
 567  */
 568
 569 u32 acpi_irq_handled;
 570 u32 acpi_irq_not_handled;
 571
 572 #define COUNT_GPE 0
 573 #define COUNT_SCI 1             /* acpi_irq_handled */
 574 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
 575 #define COUNT_ERROR 3           /* other */
 576 #define NUM_COUNTERS_EXTRA 4
 577
 578 struct event_counter {
 579         u32 count;
 580         u32 flags;
 581 };
 582
 583 static struct event_counter *all_counters;
 584 static u32 num_gpes;
 585 static u32 num_counters;
 586 static struct attribute **all_attrs;
 587 static u32 acpi_gpe_count;
 588
 589 static struct attribute_group interrupt_stats_attr_group = {
 590         .name = "interrupts",
 591 };
 592
 593 static struct kobj_attribute *counter_attrs;
 594
 595 static void delete_gpe_attr_array(void)
 596 {
 597         struct event_counter *tmp = all_counters;
 598
 599         all_counters = NULL;
 600         kfree(tmp);
 601
 602         if (counter_attrs) {
 603                 int i;
 604
 605                 for (i = 0; i < num_gpes; i++)
 606                         kfree(counter_attrs[i].attr.name);
 607
 608                 kfree(counter_attrs);
 609         }
 610         kfree(all_attrs);
 611
 612         return;
 613 }
 614
 615 static void gpe_count(u32 gpe_number)
 616 {
 617         acpi_gpe_count++;
 618
 619         if (!all_counters)
 620                 return;
 621
 622         if (gpe_number < num_gpes)
 623                 all_counters[gpe_number].count++;
 624         else
 625                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 626                              COUNT_ERROR].count++;
 627
 628         return;
 629 }
 630
 631 static void fixed_event_count(u32 event_number)
 632 {
 633         if (!all_counters)
 634                 return;
 635
 636         if (event_number < ACPI_NUM_FIXED_EVENTS)
 637                 all_counters[num_gpes + event_number].count++;
 638         else
 639                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 640                              COUNT_ERROR].count++;
 641
 642         return;
 643 }
 644
 645 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
 646         u32 event_number, void *context)
 647 {
 648         if (event_type == ACPI_EVENT_TYPE_GPE) {
 649                 gpe_count(event_number);
 650                 pr_debug("GPE event 0x%02x\n", event_number);
 651         } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
 652                 fixed_event_count(event_number);
 653                 pr_debug("Fixed event 0x%02x\n", event_number);
 654         } else {
 655                 pr_debug("Other event 0x%02x\n", event_number);
 656         }
 657 }
 658
 659 static int get_status(u32 index, acpi_event_status *status,
 660                       acpi_handle *handle)
 661 {
 662         int result;
 663
 664         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 665                 return -EINVAL;
 666
 667         if (index < num_gpes) {
 668                 result = acpi_get_gpe_device(index, handle);
 669                 if (result) {
 670                         ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
 671                                         "Invalid GPE 0x%x", index));
 672                         return result;
 673                 }
 674                 result = acpi_get_gpe_status(*handle, index, status);
 675         } else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
 676                 result = acpi_get_event_status(index - num_gpes, status);
 677
 678         return result;
 679 }
 680
 681 static ssize_t counter_show(struct kobject *kobj,
 682                             struct kobj_attribute *attr, char *buf)
 683 {
 684         int index = attr - counter_attrs;
 685         int size;
 686         acpi_handle handle;
 687         acpi_event_status status;
 688         int result = 0;
 689
 690         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 691             acpi_irq_handled;
 692         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 693             acpi_irq_not_handled;
 694         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 695             acpi_gpe_count;
 696         size = sprintf(buf, "%8u", all_counters[index].count);
 697
 698         /* "gpe_all" or "sci" */
 699         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 700                 goto end;
 701
 702         result = get_status(index, &status, &handle);
 703         if (result)
 704                 goto end;
 705
 706         if (status & ACPI_EVENT_FLAG_ENABLE_SET)
 707                 size += sprintf(buf + size, "  EN");
 708         else
 709                 size += sprintf(buf + size, "    ");
 710         if (status & ACPI_EVENT_FLAG_STATUS_SET)
 711                 size += sprintf(buf + size, " STS");
 712         else
 713                 size += sprintf(buf + size, "    ");
 714
 715         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
 716                 size += sprintf(buf + size, " invalid     ");
 717         else if (status & ACPI_EVENT_FLAG_ENABLED)
 718                 size += sprintf(buf + size, " enabled     ");
 719         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 720                 size += sprintf(buf + size, " wake_enabled");
 721         else
 722                 size += sprintf(buf + size, " disabled    ");
 723         if (status & ACPI_EVENT_FLAG_MASKED)
 724                 size += sprintf(buf + size, " masked  ");
 725         else
 726                 size += sprintf(buf + size, " unmasked");
 727
 728 end:
 729         size += sprintf(buf + size, "\n");
 730         return result ? result : size;
 731 }
 732
 733 /*
 734  * counter_set() sets the specified counter.
 735  * setting the total "sci" file to any value clears all counters.
 736  * enable/disable/clear a gpe/fixed event in user space.
 737  */
 738 static ssize_t counter_set(struct kobject *kobj,
 739                            struct kobj_attribute *attr, const char *buf,
 740                            size_t size)
 741 {
 742         int index = attr - counter_attrs;
 743         acpi_event_status status;
 744         acpi_handle handle;
 745         int result = 0;
 746         unsigned long tmp;
 747
 748         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 749                 int i;
 750                 for (i = 0; i < num_counters; ++i)
 751                         all_counters[i].count = 0;
 752                 acpi_gpe_count = 0;
 753                 acpi_irq_handled = 0;
 754                 acpi_irq_not_handled = 0;
 755                 goto end;
 756         }
 757
 758         /* show the event status for both GPEs and Fixed Events */
 759         result = get_status(index, &status, &handle);
 760         if (result)
 761                 goto end;
 762
 763         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
 764                 printk(KERN_WARNING PREFIX
 765                        "Can not change Invalid GPE/Fixed Event status\n");
 766                 return -EINVAL;
 767         }
 768
 769         if (index < num_gpes) {
 770                 if (!strcmp(buf, "disable\n") &&
 771                     (status & ACPI_EVENT_FLAG_ENABLED))
 772                         result = acpi_disable_gpe(handle, index);
 773                 else if (!strcmp(buf, "enable\n") &&
 774                          !(status & ACPI_EVENT_FLAG_ENABLED))
 775                         result = acpi_enable_gpe(handle, index);
 776                 else if (!strcmp(buf, "clear\n") &&
 777                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 778                         result = acpi_clear_gpe(handle, index);
 779                 else if (!strcmp(buf, "mask\n"))
 780                         result = acpi_mask_gpe(handle, index, TRUE);
 781                 else if (!strcmp(buf, "unmask\n"))
 782                         result = acpi_mask_gpe(handle, index, FALSE);
 783                 else if (!kstrtoul(buf, 0, &tmp))
 784                         all_counters[index].count = tmp;
 785                 else
 786                         result = -EINVAL;
 787         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 788                 int event = index - num_gpes;
 789                 if (!strcmp(buf, "disable\n") &&
 790                     (status & ACPI_EVENT_FLAG_ENABLE_SET))
 791                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 792                 else if (!strcmp(buf, "enable\n") &&
 793                          !(status & ACPI_EVENT_FLAG_ENABLE_SET))
 794                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 795                 else if (!strcmp(buf, "clear\n") &&
 796                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 797                         result = acpi_clear_event(event);
 798                 else if (!kstrtoul(buf, 0, &tmp))
 799                         all_counters[index].count = tmp;
 800                 else
 801                         result = -EINVAL;
 802         } else
 803                 all_counters[index].count = strtoul(buf, NULL, 0);
 804
 805         if (ACPI_FAILURE(result))
 806                 result = -EINVAL;
 807 end:
 808         return result ? result : size;
 809 }
 810
 811 /*
 812  * A Quirk Mechanism for GPE Flooding Prevention:
 813  *
 814  * Quirks may be needed to prevent GPE flooding on a specific GPE. The
 815  * flooding typically cannot be detected and automatically prevented by
 816  * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
 817  * the AML tables. This normally indicates a feature gap in Linux, thus
 818  * instead of providing endless quirk tables, we provide a boot parameter
 819  * for those who want this quirk. For example, if the users want to prevent
 820  * the GPE flooding for GPE 00, they need to specify the following boot
 821  * parameter:
 822  *   acpi_mask_gpe=0x00
 823  * The masking status can be modified by the following runtime controlling
 824  * interface:
 825  *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
 826  */
 827
 828 /*
 829  * Currently, the GPE flooding prevention only supports to mask the GPEs
 830  * numbered from 00 to 7f.
 831  */
 832 #define ACPI_MASKABLE_GPE_MAX   0x80
 833
 834 static u64 __initdata acpi_masked_gpes;
 835
 836 static int __init acpi_gpe_set_masked_gpes(char *val)
 837 {
 838         u8 gpe;
 839
 840         if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
 841                 return -EINVAL;
 842         acpi_masked_gpes |= ((u64)1<<gpe);
 843
 844         return 1;
 845 }
 846 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
 847
 848 void __init acpi_gpe_apply_masked_gpes(void)
 849 {
 850         acpi_handle handle;
 851         acpi_status status;
 852         u8 gpe;
 853
 854         for (gpe = 0;
 855              gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count);
 856              gpe++) {
 857                 if (acpi_masked_gpes & ((u64)1<<gpe)) {
 858                         status = acpi_get_gpe_device(gpe, &handle);
 859                         if (ACPI_SUCCESS(status)) {
 860                                 pr_info("Masking GPE 0x%x.\n", gpe);
 861                                 (void)acpi_mask_gpe(handle, gpe, TRUE);
 862                         }
 863                 }
 864         }
 865 }
 866
 867 void acpi_irq_stats_init(void)
 868 {
 869         acpi_status status;
 870         int i;
 871
 872         if (all_counters)
 873                 return;
 874
 875         num_gpes = acpi_current_gpe_count;
 876         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 877
 878         all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
 879                             GFP_KERNEL);
 880         if (all_attrs == NULL)
 881                 return;
 882
 883         all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
 884                                GFP_KERNEL);
 885         if (all_counters == NULL)
 886                 goto fail;
 887
 888         status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
 889         if (ACPI_FAILURE(status))
 890                 goto fail;
 891
 892         counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
 893                                 GFP_KERNEL);
 894         if (counter_attrs == NULL)
 895                 goto fail;
 896
 897         for (i = 0; i < num_counters; ++i) {
 898                 char buffer[12];
 899                 char *name;
 900
 901                 if (i < num_gpes)
 902                         sprintf(buffer, "gpe%02X", i);
 903                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 904                         sprintf(buffer, "ff_pmtimer");
 905                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 906                         sprintf(buffer, "ff_gbl_lock");
 907                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 908                         sprintf(buffer, "ff_pwr_btn");
 909                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 910                         sprintf(buffer, "ff_slp_btn");
 911                 else if (i == num_gpes + ACPI_EVENT_RTC)
 912                         sprintf(buffer, "ff_rt_clk");
 913                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 914                         sprintf(buffer, "gpe_all");
 915                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 916                         sprintf(buffer, "sci");
 917                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 918                         sprintf(buffer, "sci_not");
 919                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 920                         sprintf(buffer, "error");
 921                 else
 922                         sprintf(buffer, "bug%02X", i);
 923
 924                 name = kstrdup(buffer, GFP_KERNEL);
 925                 if (name == NULL)
 926                         goto fail;
 927
 928                 sysfs_attr_init(&counter_attrs[i].attr);
 929                 counter_attrs[i].attr.name = name;
 930                 counter_attrs[i].attr.mode = 0644;
 931                 counter_attrs[i].show = counter_show;
 932                 counter_attrs[i].store = counter_set;
 933
 934                 all_attrs[i] = &counter_attrs[i].attr;
 935         }
 936
 937         interrupt_stats_attr_group.attrs = all_attrs;
 938         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 939                 return;
 940
 941 fail:
 942         delete_gpe_attr_array();
 943         return;
 944 }
 945
 946 static void __exit interrupt_stats_exit(void)
 947 {
 948         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 949
 950         delete_gpe_attr_array();
 951
 952         return;
 953 }
 954
 955 static ssize_t
 956 acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
 957                   char *buf)
 958 {
 959         return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
 960 }
 961
 962 static const struct kobj_attribute pm_profile_attr =
 963         __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
 964
 965 static ssize_t hotplug_enabled_show(struct kobject *kobj,
 966                                     struct kobj_attribute *attr, char *buf)
 967 {
 968         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 969
 970         return sprintf(buf, "%d\n", hotplug->enabled);
 971 }
 972
 973 static ssize_t hotplug_enabled_store(struct kobject *kobj,
 974                                      struct kobj_attribute *attr,
 975                                      const char *buf, size_t size)
 976 {
 977         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 978         unsigned int val;
 979
 980         if (kstrtouint(buf, 10, &val) || val > 1)
 981                 return -EINVAL;
 982
 983         acpi_scan_hotplug_enabled(hotplug, val);
 984         return size;
 985 }
 986
 987 static struct kobj_attribute hotplug_enabled_attr =
 988         __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
 989                 hotplug_enabled_store);
 990
 991 static struct attribute *hotplug_profile_attrs[] = {
 992         &hotplug_enabled_attr.attr,
 993         NULL
 994 };
 995
 996 static struct kobj_type acpi_hotplug_profile_ktype = {
 997         .sysfs_ops = &kobj_sysfs_ops,
 998         .default_attrs = hotplug_profile_attrs,
 999 };
1000
1001 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
1002                                     const char *name)
1003 {
1004         int error;
1005
1006         if (!hotplug_kobj)
1007                 goto err_out;
1008
1009         error = kobject_init_and_add(&hotplug->kobj,
1010                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
1011         if (error) {
1012                 kobject_put(&hotplug->kobj);
1013                 goto err_out;
1014         }
1015
1016         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
1017         return;
1018
1019  err_out:
1020         pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
1021 }
1022
1023 static ssize_t force_remove_show(struct kobject *kobj,
1024                                  struct kobj_attribute *attr, char *buf)
1025 {
1026         return sprintf(buf, "%d\n", 0);
1027 }
1028
1029 static ssize_t force_remove_store(struct kobject *kobj,
1030                                   struct kobj_attribute *attr,
1031                                   const char *buf, size_t size)
1032 {
1033         bool val;
1034         int ret;
1035
1036         ret = strtobool(buf, &val);
1037         if (ret < 0)
1038                 return ret;
1039
1040         if (val) {
1041                 pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
1042                 return -EINVAL;
1043         }
1044         return size;
1045 }
1046
1047 static const struct kobj_attribute force_remove_attr =
1048         __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1049                force_remove_store);
1050
1051 int __init acpi_sysfs_init(void)
1052 {
1053         int result;
1054
1055         result = acpi_tables_sysfs_init();
1056         if (result)
1057                 return result;
1058
1059         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1060         if (!hotplug_kobj)
1061                 return -ENOMEM;
1062
1063         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1064         if (result)
1065                 return result;
1066
1067         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1068         return result;
1069 }