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