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