drivers/acpi/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysfs.c - ACPI sysfs interface to userspace.
   4  */
   5
   6 #define pr_fmt(fmt) "ACPI: " fmt
   7
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/acpi.h>
  12
  13 #include "internal.h"
  14
  15 #ifdef CONFIG_ACPI_DEBUG
  16 /*
  17  * ACPI debug sysfs I/F, including:
  18  * /sys/modules/acpi/parameters/debug_layer
  19  * /sys/modules/acpi/parameters/debug_level
  20  * /sys/modules/acpi/parameters/trace_method_name
  21  * /sys/modules/acpi/parameters/trace_state
  22  * /sys/modules/acpi/parameters/trace_debug_layer
  23  * /sys/modules/acpi/parameters/trace_debug_level
  24  */
  25
  26 struct acpi_dlayer {
  27         const char *name;
  28         unsigned long value;
  29 };
  30 struct acpi_dlevel {
  31         const char *name;
  32         unsigned long value;
  33 };
  34 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  35
  36 static const struct acpi_dlayer acpi_debug_layers[] = {
  37         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  38         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  39         ACPI_DEBUG_INIT(ACPI_EVENTS),
  40         ACPI_DEBUG_INIT(ACPI_TABLES),
  41         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  42         ACPI_DEBUG_INIT(ACPI_PARSER),
  43         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  44         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  45         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  46         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  47         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  48         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  49         ACPI_DEBUG_INIT(ACPI_COMPILER),
  50         ACPI_DEBUG_INIT(ACPI_TOOLS),
  51 };
  52
  53 static const struct acpi_dlevel acpi_debug_levels[] = {
  54         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  55         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  56         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  57         ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
  58         ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
  59
  60         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  61         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  62         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  63         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  64         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  65         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  66         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  67         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  68         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  69         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  70         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  71         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  72         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  73         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  74
  75         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  76         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  77         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  78
  79         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  80         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  81         ACPI_DEBUG_INIT(ACPI_LV_IO),
  82         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  83
  84         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  85         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  86         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  87         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  88 };
  89
  90 static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
  91 {
  92         int result = 0;
  93         int i;
  94
  95         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
  96
  97         for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
  98                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
  99                                   acpi_debug_layers[i].name,
 100                                   acpi_debug_layers[i].value,
 101                                   (acpi_dbg_layer & acpi_debug_layers[i].value)
 102                                   ? '*' : ' ');
 103         }
 104         result +=
 105             sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 106                     ACPI_ALL_DRIVERS,
 107                     (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 108                     ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
 109                     == 0 ? ' ' : '-');
 110         result +=
 111             sprintf(buffer + result,
 112                     "--\ndebug_layer = 0x%08X ( * = enabled)\n",
 113                     acpi_dbg_layer);
 114
 115         return result;
 116 }
 117
 118 static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
 119 {
 120         int result = 0;
 121         int i;
 122
 123         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 124
 125         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 126                 result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
 127                                   acpi_debug_levels[i].name,
 128                                   acpi_debug_levels[i].value,
 129                                   (acpi_dbg_level & acpi_debug_levels[i].value)
 130                                   ? '*' : ' ');
 131         }
 132         result +=
 133             sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 134                     acpi_dbg_level);
 135
 136         return result;
 137 }
 138
 139 static const struct kernel_param_ops param_ops_debug_layer = {
 140         .set = param_set_uint,
 141         .get = param_get_debug_layer,
 142 };
 143
 144 static const struct kernel_param_ops param_ops_debug_level = {
 145         .set = param_set_uint,
 146         .get = param_get_debug_level,
 147 };
 148
 149 module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
 150 module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
 151
 152 static char trace_method_name[1024];
 153
 154 static int param_set_trace_method_name(const char *val,
 155                                        const struct kernel_param *kp)
 156 {
 157         u32 saved_flags = 0;
 158         bool is_abs_path = true;
 159
 160         if (*val != '\\')
 161                 is_abs_path = false;
 162
 163         if ((is_abs_path && strlen(val) > 1023) ||
 164             (!is_abs_path && strlen(val) > 1022)) {
 165                 pr_err("%s: string parameter too long\n", kp->name);
 166                 return -ENOSPC;
 167         }
 168
 169         /*
 170          * It's not safe to update acpi_gbl_trace_method_name without
 171          * having the tracer stopped, so we save the original tracer
 172          * state and disable it.
 173          */
 174         saved_flags = acpi_gbl_trace_flags;
 175         (void)acpi_debug_trace(NULL,
 176                                acpi_gbl_trace_dbg_level,
 177                                acpi_gbl_trace_dbg_layer,
 178                                0);
 179
 180         /* This is a hack.  We can't kmalloc in early boot. */
 181         if (is_abs_path)
 182                 strcpy(trace_method_name, val);
 183         else {
 184                 trace_method_name[0] = '\\';
 185                 strcpy(trace_method_name+1, val);
 186         }
 187
 188         /* Restore the original tracer state */
 189         (void)acpi_debug_trace(trace_method_name,
 190                                acpi_gbl_trace_dbg_level,
 191                                acpi_gbl_trace_dbg_layer,
 192                                saved_flags);
 193
 194         return 0;
 195 }
 196
 197 static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
 198 {
 199         return scnprintf(buffer, PAGE_SIZE, "%s\n", acpi_gbl_trace_method_name);
 200 }
 201
 202 static const struct kernel_param_ops param_ops_trace_method = {
 203         .set = param_set_trace_method_name,
 204         .get = param_get_trace_method_name,
 205 };
 206
 207 static const struct kernel_param_ops param_ops_trace_attrib = {
 208         .set = param_set_uint,
 209         .get = param_get_uint,
 210 };
 211
 212 module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
 213 module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
 214 module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
 215
 216 static int param_set_trace_state(const char *val,
 217                                  const struct kernel_param *kp)
 218 {
 219         acpi_status status;
 220         const char *method = trace_method_name;
 221         u32 flags = 0;
 222
 223 /* So "xxx-once" comparison should go prior than "xxx" comparison */
 224 #define acpi_compare_param(val, key)    \
 225         strncmp((val), (key), sizeof(key) - 1)
 226
 227         if (!acpi_compare_param(val, "enable")) {
 228                 method = NULL;
 229                 flags = ACPI_TRACE_ENABLED;
 230         } else if (!acpi_compare_param(val, "disable"))
 231                 method = NULL;
 232         else if (!acpi_compare_param(val, "method-once"))
 233                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
 234         else if (!acpi_compare_param(val, "method"))
 235                 flags = ACPI_TRACE_ENABLED;
 236         else if (!acpi_compare_param(val, "opcode-once"))
 237                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
 238         else if (!acpi_compare_param(val, "opcode"))
 239                 flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
 240         else
 241                 return -EINVAL;
 242
 243         status = acpi_debug_trace(method,
 244                                   acpi_gbl_trace_dbg_level,
 245                                   acpi_gbl_trace_dbg_layer,
 246                                   flags);
 247         if (ACPI_FAILURE(status))
 248                 return -EBUSY;
 249
 250         return 0;
 251 }
 252
 253 static int param_get_trace_state(char *buffer, const struct kernel_param *kp)
 254 {
 255         if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
 256                 return sprintf(buffer, "disable\n");
 257         else {
 258                 if (acpi_gbl_trace_method_name) {
 259                         if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
 260                                 return sprintf(buffer, "method-once\n");
 261                         else
 262                                 return sprintf(buffer, "method\n");
 263                 } else
 264                         return sprintf(buffer, "enable\n");
 265         }
 266         return 0;
 267 }
 268
 269 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 270                   NULL, 0644);
 271 #endif /* CONFIG_ACPI_DEBUG */
 272
 273
 274 /* /sys/modules/acpi/parameters/aml_debug_output */
 275
 276 module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
 277                    byte, 0644);
 278 MODULE_PARM_DESC(aml_debug_output,
 279                  "To enable/disable the ACPI Debug Object output.");
 280
 281 /* /sys/module/acpi/parameters/acpica_version */
 282 static int param_get_acpica_version(char *buffer,
 283                                     const struct kernel_param *kp)
 284 {
 285         int result;
 286
 287         result = sprintf(buffer, "%x\n", ACPI_CA_VERSION);
 288
 289         return result;
 290 }
 291
 292 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
 293
 294 /*
 295  * ACPI table sysfs I/F:
 296  * /sys/firmware/acpi/tables/
 297  * /sys/firmware/acpi/tables/data/
 298  * /sys/firmware/acpi/tables/dynamic/
 299  */
 300
 301 static LIST_HEAD(acpi_table_attr_list);
 302 static struct kobject *tables_kobj;
 303 static struct kobject *tables_data_kobj;
 304 static struct kobject *dynamic_tables_kobj;
 305 static struct kobject *hotplug_kobj;
 306
 307 #define ACPI_MAX_TABLE_INSTANCES        999
 308 #define ACPI_INST_SIZE                  4 /* including trailing 0 */
 309
 310 struct acpi_table_attr {
 311         struct bin_attribute attr;
 312         char name[ACPI_NAMESEG_SIZE];
 313         int instance;
 314         char filename[ACPI_NAMESEG_SIZE+ACPI_INST_SIZE];
 315         struct list_head node;
 316 };
 317
 318 struct acpi_data_attr {
 319         struct bin_attribute attr;
 320         u64     addr;
 321 };
 322
 323 static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
 324                                struct bin_attribute *bin_attr, char *buf,
 325                                loff_t offset, size_t count)
 326 {
 327         struct acpi_table_attr *table_attr =
 328             container_of(bin_attr, struct acpi_table_attr, attr);
 329         struct acpi_table_header *table_header = NULL;
 330         acpi_status status;
 331         ssize_t rc;
 332
 333         status = acpi_get_table(table_attr->name, table_attr->instance,
 334                                 &table_header);
 335         if (ACPI_FAILURE(status))
 336                 return -ENODEV;
 337
 338         rc = memory_read_from_buffer(buf, count, &offset, table_header,
 339                         table_header->length);
 340         acpi_put_table(table_header);
 341         return rc;
 342 }
 343
 344 static int acpi_table_attr_init(struct kobject *tables_obj,
 345                                 struct acpi_table_attr *table_attr,
 346                                 struct acpi_table_header *table_header)
 347 {
 348         struct acpi_table_header *header = NULL;
 349         struct acpi_table_attr *attr = NULL;
 350         char instance_str[ACPI_INST_SIZE];
 351
 352         sysfs_attr_init(&table_attr->attr.attr);
 353         ACPI_COPY_NAMESEG(table_attr->name, table_header->signature);
 354
 355         list_for_each_entry(attr, &acpi_table_attr_list, node) {
 356                 if (ACPI_COMPARE_NAMESEG(table_attr->name, attr->name))
 357                         if (table_attr->instance < attr->instance)
 358                                 table_attr->instance = attr->instance;
 359         }
 360         table_attr->instance++;
 361         if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
 362                 pr_warn("%4.4s: too many table instances\n", table_attr->name);
 363                 return -ERANGE;
 364         }
 365
 366         ACPI_COPY_NAMESEG(table_attr->filename, table_header->signature);
 367         table_attr->filename[ACPI_NAMESEG_SIZE] = '\0';
 368         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
 369                                          !acpi_get_table
 370                                          (table_header->signature, 2, &header))) {
 371                 snprintf(instance_str, sizeof(instance_str), "%u",
 372                          table_attr->instance);
 373                 strcat(table_attr->filename, instance_str);
 374         }
 375
 376         table_attr->attr.size = table_header->length;
 377         table_attr->attr.read = acpi_table_show;
 378         table_attr->attr.attr.name = table_attr->filename;
 379         table_attr->attr.attr.mode = 0400;
 380
 381         return sysfs_create_bin_file(tables_obj, &table_attr->attr);
 382 }
 383
 384 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
 385 {
 386         struct acpi_table_attr *table_attr;
 387
 388         switch (event) {
 389         case ACPI_TABLE_EVENT_INSTALL:
 390                 table_attr =
 391                     kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
 392                 if (!table_attr)
 393                         return AE_NO_MEMORY;
 394
 395                 if (acpi_table_attr_init(dynamic_tables_kobj,
 396                                          table_attr, table)) {
 397                         kfree(table_attr);
 398                         return AE_ERROR;
 399                 }
 400                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 401                 break;
 402         case ACPI_TABLE_EVENT_LOAD:
 403         case ACPI_TABLE_EVENT_UNLOAD:
 404         case ACPI_TABLE_EVENT_UNINSTALL:
 405                 /*
 406                  * we do not need to do anything right now
 407                  * because the table is not deleted from the
 408                  * global table list when unloading it.
 409                  */
 410                 break;
 411         default:
 412                 return AE_BAD_PARAMETER;
 413         }
 414         return AE_OK;
 415 }
 416
 417 static ssize_t acpi_data_show(struct file *filp, struct kobject *kobj,
 418                               struct bin_attribute *bin_attr, char *buf,
 419                               loff_t offset, size_t count)
 420 {
 421         struct acpi_data_attr *data_attr;
 422         void __iomem *base;
 423         ssize_t rc;
 424
 425         data_attr = container_of(bin_attr, struct acpi_data_attr, attr);
 426
 427         base = acpi_os_map_memory(data_attr->addr, data_attr->attr.size);
 428         if (!base)
 429                 return -ENOMEM;
 430         rc = memory_read_from_buffer(buf, count, &offset, base,
 431                                      data_attr->attr.size);
 432         acpi_os_unmap_memory(base, data_attr->attr.size);
 433
 434         return rc;
 435 }
 436
 437 static int acpi_bert_data_init(void *th, struct acpi_data_attr *data_attr)
 438 {
 439         struct acpi_table_bert *bert = th;
 440
 441         if (bert->header.length < sizeof(struct acpi_table_bert) ||
 442             bert->region_length < sizeof(struct acpi_hest_generic_status)) {
 443                 kfree(data_attr);
 444                 return -EINVAL;
 445         }
 446         data_attr->addr = bert->address;
 447         data_attr->attr.size = bert->region_length;
 448         data_attr->attr.attr.name = "BERT";
 449
 450         return sysfs_create_bin_file(tables_data_kobj, &data_attr->attr);
 451 }
 452
 453 static struct acpi_data_obj {
 454         char *name;
 455         int (*fn)(void *, struct acpi_data_attr *);
 456 } acpi_data_objs[] = {
 457         { ACPI_SIG_BERT, acpi_bert_data_init },
 458 };
 459
 460 #define NUM_ACPI_DATA_OBJS ARRAY_SIZE(acpi_data_objs)
 461
 462 static int acpi_table_data_init(struct acpi_table_header *th)
 463 {
 464         struct acpi_data_attr *data_attr;
 465         int i;
 466
 467         for (i = 0; i < NUM_ACPI_DATA_OBJS; i++) {
 468                 if (ACPI_COMPARE_NAMESEG(th->signature, acpi_data_objs[i].name)) {
 469                         data_attr = kzalloc(sizeof(*data_attr), GFP_KERNEL);
 470                         if (!data_attr)
 471                                 return -ENOMEM;
 472                         sysfs_attr_init(&data_attr->attr.attr);
 473                         data_attr->attr.read = acpi_data_show;
 474                         data_attr->attr.attr.mode = 0400;
 475                         return acpi_data_objs[i].fn(th, data_attr);
 476                 }
 477         }
 478         return 0;
 479 }
 480
 481 static int acpi_tables_sysfs_init(void)
 482 {
 483         struct acpi_table_attr *table_attr;
 484         struct acpi_table_header *table_header = NULL;
 485         int table_index;
 486         acpi_status status;
 487         int ret;
 488
 489         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
 490         if (!tables_kobj)
 491                 goto err;
 492
 493         tables_data_kobj = kobject_create_and_add("data", tables_kobj);
 494         if (!tables_data_kobj)
 495                 goto err_tables_data;
 496
 497         dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
 498         if (!dynamic_tables_kobj)
 499                 goto err_dynamic_tables;
 500
 501         for (table_index = 0;; table_index++) {
 502                 status = acpi_get_table_by_index(table_index, &table_header);
 503
 504                 if (status == AE_BAD_PARAMETER)
 505                         break;
 506
 507                 if (ACPI_FAILURE(status))
 508                         continue;
 509
 510                 table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
 511                 if (!table_attr)
 512                         return -ENOMEM;
 513
 514                 ret = acpi_table_attr_init(tables_kobj,
 515                                            table_attr, table_header);
 516                 if (ret) {
 517                         kfree(table_attr);
 518                         return ret;
 519                 }
 520                 list_add_tail(&table_attr->node, &acpi_table_attr_list);
 521                 acpi_table_data_init(table_header);
 522         }
 523
 524         kobject_uevent(tables_kobj, KOBJ_ADD);
 525         kobject_uevent(tables_data_kobj, KOBJ_ADD);
 526         kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
 527
 528         return 0;
 529 err_dynamic_tables:
 530         kobject_put(tables_data_kobj);
 531 err_tables_data:
 532         kobject_put(tables_kobj);
 533 err:
 534         return -ENOMEM;
 535 }
 536
 537 /*
 538  * Detailed ACPI IRQ counters:
 539  * /sys/firmware/acpi/interrupts/
 540  */
 541
 542 u32 acpi_irq_handled;
 543 u32 acpi_irq_not_handled;
 544
 545 #define COUNT_GPE 0
 546 #define COUNT_SCI 1             /* acpi_irq_handled */
 547 #define COUNT_SCI_NOT 2         /* acpi_irq_not_handled */
 548 #define COUNT_ERROR 3           /* other */
 549 #define NUM_COUNTERS_EXTRA 4
 550
 551 struct event_counter {
 552         u32 count;
 553         u32 flags;
 554 };
 555
 556 static struct event_counter *all_counters;
 557 static u32 num_gpes;
 558 static u32 num_counters;
 559 static struct attribute **all_attrs;
 560 static u32 acpi_gpe_count;
 561
 562 static struct attribute_group interrupt_stats_attr_group = {
 563         .name = "interrupts",
 564 };
 565
 566 static struct kobj_attribute *counter_attrs;
 567
 568 static void delete_gpe_attr_array(void)
 569 {
 570         struct event_counter *tmp = all_counters;
 571
 572         all_counters = NULL;
 573         kfree(tmp);
 574
 575         if (counter_attrs) {
 576                 int i;
 577
 578                 for (i = 0; i < num_gpes; i++)
 579                         kfree(counter_attrs[i].attr.name);
 580
 581                 kfree(counter_attrs);
 582         }
 583         kfree(all_attrs);
 584
 585         return;
 586 }
 587
 588 static void gpe_count(u32 gpe_number)
 589 {
 590         acpi_gpe_count++;
 591
 592         if (!all_counters)
 593                 return;
 594
 595         if (gpe_number < num_gpes)
 596                 all_counters[gpe_number].count++;
 597         else
 598                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 599                              COUNT_ERROR].count++;
 600
 601         return;
 602 }
 603
 604 static void fixed_event_count(u32 event_number)
 605 {
 606         if (!all_counters)
 607                 return;
 608
 609         if (event_number < ACPI_NUM_FIXED_EVENTS)
 610                 all_counters[num_gpes + event_number].count++;
 611         else
 612                 all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
 613                              COUNT_ERROR].count++;
 614
 615         return;
 616 }
 617
 618 static void acpi_global_event_handler(u32 event_type, acpi_handle device,
 619         u32 event_number, void *context)
 620 {
 621         if (event_type == ACPI_EVENT_TYPE_GPE) {
 622                 gpe_count(event_number);
 623                 pr_debug("GPE event 0x%02x\n", event_number);
 624         } else if (event_type == ACPI_EVENT_TYPE_FIXED) {
 625                 fixed_event_count(event_number);
 626                 pr_debug("Fixed event 0x%02x\n", event_number);
 627         } else {
 628                 pr_debug("Other event 0x%02x\n", event_number);
 629         }
 630 }
 631
 632 static int get_status(u32 index, acpi_event_status *ret,
 633                       acpi_handle *handle)
 634 {
 635         acpi_status status;
 636
 637         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 638                 return -EINVAL;
 639
 640         if (index < num_gpes) {
 641                 status = acpi_get_gpe_device(index, handle);
 642                 if (ACPI_FAILURE(status)) {
 643                         pr_warn("Invalid GPE 0x%x", index);
 644                         return -ENXIO;
 645                 }
 646                 status = acpi_get_gpe_status(*handle, index, ret);
 647         } else {
 648                 status = acpi_get_event_status(index - num_gpes, ret);
 649         }
 650         if (ACPI_FAILURE(status))
 651                 return -EIO;
 652
 653         return 0;
 654 }
 655
 656 static ssize_t counter_show(struct kobject *kobj,
 657                             struct kobj_attribute *attr, char *buf)
 658 {
 659         int index = attr - counter_attrs;
 660         int size;
 661         acpi_handle handle;
 662         acpi_event_status status;
 663         int result = 0;
 664
 665         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
 666             acpi_irq_handled;
 667         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
 668             acpi_irq_not_handled;
 669         all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
 670             acpi_gpe_count;
 671         size = sprintf(buf, "%8u", all_counters[index].count);
 672
 673         /* "gpe_all" or "sci" */
 674         if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
 675                 goto end;
 676
 677         result = get_status(index, &status, &handle);
 678         if (result)
 679                 goto end;
 680
 681         if (status & ACPI_EVENT_FLAG_ENABLE_SET)
 682                 size += sprintf(buf + size, "  EN");
 683         else
 684                 size += sprintf(buf + size, "    ");
 685         if (status & ACPI_EVENT_FLAG_STATUS_SET)
 686                 size += sprintf(buf + size, " STS");
 687         else
 688                 size += sprintf(buf + size, "    ");
 689
 690         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
 691                 size += sprintf(buf + size, " invalid     ");
 692         else if (status & ACPI_EVENT_FLAG_ENABLED)
 693                 size += sprintf(buf + size, " enabled     ");
 694         else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
 695                 size += sprintf(buf + size, " wake_enabled");
 696         else
 697                 size += sprintf(buf + size, " disabled    ");
 698         if (status & ACPI_EVENT_FLAG_MASKED)
 699                 size += sprintf(buf + size, " masked  ");
 700         else
 701                 size += sprintf(buf + size, " unmasked");
 702
 703 end:
 704         size += sprintf(buf + size, "\n");
 705         return result ? result : size;
 706 }
 707
 708 /*
 709  * counter_set() sets the specified counter.
 710  * setting the total "sci" file to any value clears all counters.
 711  * enable/disable/clear a gpe/fixed event in user space.
 712  */
 713 static ssize_t counter_set(struct kobject *kobj,
 714                            struct kobj_attribute *attr, const char *buf,
 715                            size_t size)
 716 {
 717         int index = attr - counter_attrs;
 718         acpi_event_status status;
 719         acpi_handle handle;
 720         int result = 0;
 721         unsigned long tmp;
 722
 723         if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
 724                 int i;
 725                 for (i = 0; i < num_counters; ++i)
 726                         all_counters[i].count = 0;
 727                 acpi_gpe_count = 0;
 728                 acpi_irq_handled = 0;
 729                 acpi_irq_not_handled = 0;
 730                 goto end;
 731         }
 732
 733         /* show the event status for both GPEs and Fixed Events */
 734         result = get_status(index, &status, &handle);
 735         if (result)
 736                 goto end;
 737
 738         if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
 739                 pr_warn("Can not change Invalid GPE/Fixed Event status\n");
 740                 return -EINVAL;
 741         }
 742
 743         if (index < num_gpes) {
 744                 if (!strcmp(buf, "disable\n") &&
 745                     (status & ACPI_EVENT_FLAG_ENABLED))
 746                         result = acpi_disable_gpe(handle, index);
 747                 else if (!strcmp(buf, "enable\n") &&
 748                          !(status & ACPI_EVENT_FLAG_ENABLED))
 749                         result = acpi_enable_gpe(handle, index);
 750                 else if (!strcmp(buf, "clear\n") &&
 751                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 752                         result = acpi_clear_gpe(handle, index);
 753                 else if (!strcmp(buf, "mask\n"))
 754                         result = acpi_mask_gpe(handle, index, TRUE);
 755                 else if (!strcmp(buf, "unmask\n"))
 756                         result = acpi_mask_gpe(handle, index, FALSE);
 757                 else if (!kstrtoul(buf, 0, &tmp))
 758                         all_counters[index].count = tmp;
 759                 else
 760                         result = -EINVAL;
 761         } else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
 762                 int event = index - num_gpes;
 763                 if (!strcmp(buf, "disable\n") &&
 764                     (status & ACPI_EVENT_FLAG_ENABLE_SET))
 765                         result = acpi_disable_event(event, ACPI_NOT_ISR);
 766                 else if (!strcmp(buf, "enable\n") &&
 767                          !(status & ACPI_EVENT_FLAG_ENABLE_SET))
 768                         result = acpi_enable_event(event, ACPI_NOT_ISR);
 769                 else if (!strcmp(buf, "clear\n") &&
 770                          (status & ACPI_EVENT_FLAG_STATUS_SET))
 771                         result = acpi_clear_event(event);
 772                 else if (!kstrtoul(buf, 0, &tmp))
 773                         all_counters[index].count = tmp;
 774                 else
 775                         result = -EINVAL;
 776         } else
 777                 all_counters[index].count = strtoul(buf, NULL, 0);
 778
 779         if (ACPI_FAILURE(result))
 780                 result = -EINVAL;
 781 end:
 782         return result ? result : size;
 783 }
 784
 785 /*
 786  * A Quirk Mechanism for GPE Flooding Prevention:
 787  *
 788  * Quirks may be needed to prevent GPE flooding on a specific GPE. The
 789  * flooding typically cannot be detected and automatically prevented by
 790  * ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
 791  * the AML tables. This normally indicates a feature gap in Linux, thus
 792  * instead of providing endless quirk tables, we provide a boot parameter
 793  * for those who want this quirk. For example, if the users want to prevent
 794  * the GPE flooding for GPE 00, they need to specify the following boot
 795  * parameter:
 796  *   acpi_mask_gpe=0x00
 797  * The masking status can be modified by the following runtime controlling
 798  * interface:
 799  *   echo unmask > /sys/firmware/acpi/interrupts/gpe00
 800  */
 801 #define ACPI_MASKABLE_GPE_MAX   0x100
 802 static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
 803
 804 static int __init acpi_gpe_set_masked_gpes(char *val)
 805 {
 806         u8 gpe;
 807
 808         if (kstrtou8(val, 0, &gpe))
 809                 return -EINVAL;
 810         set_bit(gpe, acpi_masked_gpes_map);
 811
 812         return 1;
 813 }
 814 __setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
 815
 816 void __init acpi_gpe_apply_masked_gpes(void)
 817 {
 818         acpi_handle handle;
 819         acpi_status status;
 820         u16 gpe;
 821
 822         for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
 823                 status = acpi_get_gpe_device(gpe, &handle);
 824                 if (ACPI_SUCCESS(status)) {
 825                         pr_info("Masking GPE 0x%x.\n", gpe);
 826                         (void)acpi_mask_gpe(handle, gpe, TRUE);
 827                 }
 828         }
 829 }
 830
 831 void acpi_irq_stats_init(void)
 832 {
 833         acpi_status status;
 834         int i;
 835
 836         if (all_counters)
 837                 return;
 838
 839         num_gpes = acpi_current_gpe_count;
 840         num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
 841
 842         all_attrs = kcalloc(num_counters + 1, sizeof(struct attribute *),
 843                             GFP_KERNEL);
 844         if (all_attrs == NULL)
 845                 return;
 846
 847         all_counters = kcalloc(num_counters, sizeof(struct event_counter),
 848                                GFP_KERNEL);
 849         if (all_counters == NULL)
 850                 goto fail;
 851
 852         status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
 853         if (ACPI_FAILURE(status))
 854                 goto fail;
 855
 856         counter_attrs = kcalloc(num_counters, sizeof(struct kobj_attribute),
 857                                 GFP_KERNEL);
 858         if (counter_attrs == NULL)
 859                 goto fail;
 860
 861         for (i = 0; i < num_counters; ++i) {
 862                 char buffer[12];
 863                 char *name;
 864
 865                 if (i < num_gpes)
 866                         sprintf(buffer, "gpe%02X", i);
 867                 else if (i == num_gpes + ACPI_EVENT_PMTIMER)
 868                         sprintf(buffer, "ff_pmtimer");
 869                 else if (i == num_gpes + ACPI_EVENT_GLOBAL)
 870                         sprintf(buffer, "ff_gbl_lock");
 871                 else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
 872                         sprintf(buffer, "ff_pwr_btn");
 873                 else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
 874                         sprintf(buffer, "ff_slp_btn");
 875                 else if (i == num_gpes + ACPI_EVENT_RTC)
 876                         sprintf(buffer, "ff_rt_clk");
 877                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
 878                         sprintf(buffer, "gpe_all");
 879                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
 880                         sprintf(buffer, "sci");
 881                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
 882                         sprintf(buffer, "sci_not");
 883                 else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
 884                         sprintf(buffer, "error");
 885                 else
 886                         sprintf(buffer, "bug%02X", i);
 887
 888                 name = kstrdup(buffer, GFP_KERNEL);
 889                 if (name == NULL)
 890                         goto fail;
 891
 892                 sysfs_attr_init(&counter_attrs[i].attr);
 893                 counter_attrs[i].attr.name = name;
 894                 counter_attrs[i].attr.mode = 0644;
 895                 counter_attrs[i].show = counter_show;
 896                 counter_attrs[i].store = counter_set;
 897
 898                 all_attrs[i] = &counter_attrs[i].attr;
 899         }
 900
 901         interrupt_stats_attr_group.attrs = all_attrs;
 902         if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
 903                 return;
 904
 905 fail:
 906         delete_gpe_attr_array();
 907         return;
 908 }
 909
 910 static void __exit interrupt_stats_exit(void)
 911 {
 912         sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
 913
 914         delete_gpe_attr_array();
 915
 916         return;
 917 }
 918
 919 static ssize_t
 920 acpi_show_profile(struct kobject *kobj, struct kobj_attribute *attr,
 921                   char *buf)
 922 {
 923         return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
 924 }
 925
 926 static const struct kobj_attribute pm_profile_attr =
 927         __ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
 928
 929 static ssize_t hotplug_enabled_show(struct kobject *kobj,
 930                                     struct kobj_attribute *attr, char *buf)
 931 {
 932         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 933
 934         return sprintf(buf, "%d\n", hotplug->enabled);
 935 }
 936
 937 static ssize_t hotplug_enabled_store(struct kobject *kobj,
 938                                      struct kobj_attribute *attr,
 939                                      const char *buf, size_t size)
 940 {
 941         struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
 942         unsigned int val;
 943
 944         if (kstrtouint(buf, 10, &val) || val > 1)
 945                 return -EINVAL;
 946
 947         acpi_scan_hotplug_enabled(hotplug, val);
 948         return size;
 949 }
 950
 951 static struct kobj_attribute hotplug_enabled_attr =
 952         __ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
 953                 hotplug_enabled_store);
 954
 955 static struct attribute *hotplug_profile_attrs[] = {
 956         &hotplug_enabled_attr.attr,
 957         NULL
 958 };
 959
 960 static struct kobj_type acpi_hotplug_profile_ktype = {
 961         .sysfs_ops = &kobj_sysfs_ops,
 962         .default_attrs = hotplug_profile_attrs,
 963 };
 964
 965 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
 966                                     const char *name)
 967 {
 968         int error;
 969
 970         if (!hotplug_kobj)
 971                 goto err_out;
 972
 973         error = kobject_init_and_add(&hotplug->kobj,
 974                 &acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
 975         if (error) {
 976                 kobject_put(&hotplug->kobj);
 977                 goto err_out;
 978         }
 979
 980         kobject_uevent(&hotplug->kobj, KOBJ_ADD);
 981         return;
 982
 983  err_out:
 984         pr_err("Unable to add hotplug profile '%s'\n", name);
 985 }
 986
 987 static ssize_t force_remove_show(struct kobject *kobj,
 988                                  struct kobj_attribute *attr, char *buf)
 989 {
 990         return sprintf(buf, "%d\n", 0);
 991 }
 992
 993 static ssize_t force_remove_store(struct kobject *kobj,
 994                                   struct kobj_attribute *attr,
 995                                   const char *buf, size_t size)
 996 {
 997         bool val;
 998         int ret;
 999
1000         ret = strtobool(buf, &val);
1001         if (ret < 0)
1002                 return ret;
1003
1004         if (val) {
1005                 pr_err("Enabling force_remove is not supported anymore. Please report to [email protected] if you depend on this functionality\n");
1006                 return -EINVAL;
1007         }
1008         return size;
1009 }
1010
1011 static const struct kobj_attribute force_remove_attr =
1012         __ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
1013                force_remove_store);
1014
1015 int __init acpi_sysfs_init(void)
1016 {
1017         int result;
1018
1019         result = acpi_tables_sysfs_init();
1020         if (result)
1021                 return result;
1022
1023         hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
1024         if (!hotplug_kobj)
1025                 return -ENOMEM;
1026
1027         result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
1028         if (result)
1029                 return result;
1030
1031         result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
1032         return result;
1033 }