linux/drivers/acpi/sysfs.c
<<
>>
Prefs
   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
  26struct acpi_dlayer {
  27        const char *name;
  28        unsigned long value;
  29};
  30struct acpi_dlevel {
  31        const char *name;
  32        unsigned long value;
  33};
  34#define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  35
  36static 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
  53static 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
  90static 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
 118static 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
 139static const struct kernel_param_ops param_ops_debug_layer = {
 140        .set = param_set_uint,
 141        .get = param_get_debug_layer,
 142};
 143
 144static const struct kernel_param_ops param_ops_debug_level = {
 145        .set = param_set_uint,
 146        .get = param_get_debug_level,
 147};
 148
 149module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 150module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 151
 152static char trace_method_name[1024];
 153
 154static 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
 197static 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
 202static 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
 207static const struct kernel_param_ops param_ops_trace_attrib = {
 208        .set = param_set_uint,
 209        .get = param_get_uint,
 210};
 211
 212module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
 213module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 214module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 215
 216static 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
 253static 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
 269module_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
 276module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 277                   byte, 0644);
 278MODULE_PARM_DESC(aml_debug_output,
 279                 "To enable/disable the ACPI Debug Object output.");
 280
 281/* /sys/module/acpi/parameters/acpica_version */
 282static 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
 292module_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
 301static LIST_HEAD(acpi_table_attr_list);
 302static struct kobject *tables_kobj;
 303static struct kobject *tables_data_kobj;
 304static struct kobject *dynamic_tables_kobj;
 305static struct kobject *hotplug_kobj;
 306
 307#define ACPI_MAX_TABLE_INSTANCES        999
 308#define ACPI_INST_SIZE                  4 /* including trailing 0 */
 309
 310struct 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
 318struct acpi_data_attr {
 319        struct bin_attribute attr;
 320        u64     addr;
 321};
 322
 323static 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
 344static 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
 385acpi_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
 418static 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
 438static 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
 454static 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
 463static 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
 482static 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;
 530err_dynamic_tables:
 531        kobject_put(tables_data_kobj);
 532err_tables_data:
 533        kobject_put(tables_kobj);
 534err:
 535        return -ENOMEM;
 536}
 537
 538/*
 539 * Detailed ACPI IRQ counters:
 540 * /sys/firmware/acpi/interrupts/
 541 */
 542
 543u32 acpi_irq_handled;
 544u32 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
 552struct event_counter {
 553        u32 count;
 554        u32 flags;
 555};
 556
 557static struct event_counter *all_counters;
 558static u32 num_gpes;
 559static u32 num_counters;
 560static struct attribute **all_attrs;
 561static u32 acpi_gpe_count;
 562
 563static struct attribute_group interrupt_stats_attr_group = {
 564        .name = "interrupts",
 565};
 566
 567static struct kobj_attribute *counter_attrs;
 568
 569static 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
 589static 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
 605static 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
 619static 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
 633static 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
 657static 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
 704end:
 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 */
 714static 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;
 783end:
 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
 804static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
 805
 806static 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
 818void __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
 833void 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
 907fail:
 908        delete_gpe_attr_array();
 909        return;
 910}
 911
 912static 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
 921static ssize_t
 922acpi_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
 928static const struct kobj_attribute pm_profile_attr =
 929        __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
 930
 931static 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
 939static 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
 953static struct kobj_attribute hotplug_enabled_attr =
 954        __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
 955                hotplug_enabled_store);
 956
 957static struct attribute *hotplug_profile_attrs[] = {
 958        &hotplug_enabled_attr.attr,
 959        NULL
 960};
 961
 962static struct kobj_type acpi_hotplug_profile_ktype = {
 963        .sysfs_ops = &kobj_sysfs_ops,
 964        .default_attrs = hotplug_profile_attrs,
 965};
 966
 967void 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
 989static 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
 995static 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
1013static const struct kobj_attribute force_remove_attr =
1014        __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1015               force_remove_store);
1016
1017int __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}
1036